Guangdong local standard for electrostatic fume purification equipment

Guangdong Local Standard "Electrostatic Fume Purification Equipment"

(Draft for Comment) Compilation Description

I. Source of the mandate

Guangdong provincial local standard "Electrostatic Fume Purification Equipment" is a standard project approved by Guangdong Provincial Bureau of Quality and Technical Supervision in 2008. This standard was jointly drafted by Foshan Kelan Environmental Protection Equipment Co., Ltd., Guangdong Institute of Standardization and Guangdong Environmental Protection Industry Association.

This standard is a recommended standard, which is applicable to electrostatic oil fume purification equipment produced, sold and used in Guangdong Province, and also to composite oil fume purification equipment combining static electricity with other methods, except for special parts (groups) for removing oil fume by non-electrostatic method. Basic performance requirements, electrical safety and electrical service life, etc. Electrostatic composite flue gas purification equipment is applicable to this standard.

Second, the preparation background, purpose and significance

The data of "2008 China Catering Industry Operation Report" issued by China Cuisine Association (hereinafter referred to as "Report") shows that: "Since 199 1, the retail sales of China's catering industry has maintained a rapid growth of more than 10%. In 2007, the development of catering industry in China reached a new level, with the total retail sales of catering industry in China reaching 65.438+23.52 billion yuan, up 654.38+0.9% year-on-year. In the first half of 2008, the national accommodation and catering market continued to grow at a high speed, with retail sales reaching 720.7 billion yuan, a year-on-year increase of 24%. It is estimated that the retail sales of catering industry in China will reach 2 trillion yuan in 20 10.

"The catering industry is a sunrise industry with great growth. Driven by the policy of continuing to fully implement Scientific Outlook on Development, accelerating the construction of a harmonious society and achieving sound and rapid economic and social development, the catering industry in China continues to maintain a sound, rapid and stable development pattern. At present, the per capita consumption of catering industry in China has just reached 100 USD. Compared with USA 1.600 and France 1.050, there is still much room for development. Food is the most important thing for the people, and food is safe for life. With the influence of the government's policy of stimulating consumption, the rapid growth of urban and rural residents' income and the renewal of consumption concepts, the catering industry will remain a conspicuous consumption hotspot in the future. (Excerpted from the 2007 China Catering Industry Operation Report) According to the 2007 China Catering Industry Operation Report, Guangdong's catering industry ranked first in all respects. However, "cooking fume pollution in catering industry has become the third largest air pollution source after industrial pollution and traffic pollution, and cooking fume pollution in catering industry has gradually become the focus of attention." In many cities, complaints about cooking fume pollution in catering industry have accounted for 30 ~ 40% of environmental complaints. "(Quoted from" China Exhaust Gas Purification Industry Development Report in 2006 ") The traditional cooking mode in China leads to the inevitable generation of lampblack. Oil fume pollution is characterized by large quantity, wide area, strong low-altitude diffusion and strong intuitive reaction of people, which directly affects human health. At the same time, the attachment of oil fume has a great impact on environmental sanitation and damages the image of modern civilized cities. On the one hand, smoke and dust emissions are concentrated in densely populated urban areas, which directly affects the health of residents and becomes an important livelihood issue that disturbs people. Inhalation of oil fume can directly damage respiratory mucosa, stimulate human respiratory tract and lungs, reduce human immune function, and cause symptoms such as choking cough, chest tightness, shortness of breath, airway contraction and increased respiratory resistance. In terms of genotoxicity, oil fume can cause cytogenotoxic substances with different biological effects, which are carcinogenic and mutagenic, causing gene mutation and chromosome damage. The research shows that 5 1.56% of lung squamous cell carcinoma and 60.99% of lung adenocarcinoma in the population should be attributed to the pollution of cooking oil fume. Cooking fume pollution in catering industry has always been the primary problem and focus of complaints from environmental protection departments. Therefore, the problem of cooking fume in catering industry is not only an environmental problem, but also a social problem. On the other hand, the main pollutants contained in the cooking fume of catering industry are inhalable particulate matter (PM 10) and volatile organic compounds (VOC), which is one of the chief culprits of smog weather in the Pearl River Delta. Inhalable particulate matter has complex components and strong adsorption capacity. It is the "carrier" and "catalyst" of various pollutants, and sometimes it can become a collection of various pollutants. Together with volatile organic compounds, it is the source of photochemical reactions (pollution) in the air.

Oil fume and waste gas are insoluble in water and will not fall to the ground with rain, but float in the air, forming a long-term pollution source. At present, the effective control method is to purify first and then discharge centrally. In 200 1 year, the State Environmental Protection Administration and the General Administration of Quality Supervision, Inspection and Quarantine issued GB 18483—200 1 "Cooking fume emission standard", which stipulated the cooking fume emission of the catering industry and provided a legal basis for controlling cooking fume pollution. Excellent oil fume purification equipment can not only purify the discharged air, but also centrally recycle waste oil as industrial raw materials for daily chemicals such as soap, thus achieving the dual effects of saving and reducing emissions. At present, the oil fume purification technology is basically mature, and the mainstream product in the market is electrostatic purification. Electrostatic fume removal technology is also recognized as the best method for fume purification with high efficiency, rapidity and meeting the current market demand. However, at present, there is no relevant legal standard for electrostatic catering oil fume purifier, so the oil removal efficiency of various products on the market can not meet the national standard and meet the current needs of environmental protection, which not only harms users, but also brings trouble to urban environmental governance and hinders national environmental protection. At the same time, it also disrupts the market and limits the development of related equipment manufacturing industry.

Judging from the situation of domestic environmental protection equipment manufacturing industry, workshop-style production is still widespread and has not really achieved large-scale production. The local protection of the industry is strong, the industrial competition is not sufficient, and the low-level repetition is obvious. The development of the industry needs the guidance and promotion of standards. At present, there are no relevant local standards in other provinces. If Guangdong province takes the lead in issuing local standards, it can well guide the development of the industry and promote our province's environmental protection industry to gain opportunities and favorable conditions in the national market competition.

Guangdong Province is one of the most developed provinces in China. Oil fume pollution is relatively more serious than other places, and there are also the most complaints about oil fume. With the increasing pressure of environmental protection, the national oil fume emission limit will be gradually tightened, and the environmental emission management will be continuously strengthened, which will create excellent development opportunities for the development of environmental protection equipment manufacturing industries such as cooking fume purification in Guangdong. At the same time, Guangdong's environmental protection equipment manufacturing industry has developed rapidly in recent years. With the new round of industrial restructuring in Guangdong, environmental protection equipment manufacturing industry is expected to become a new bright spot in Guangdong's industrial development. For example, Foshan is planning to list environmental protection industry as a new pillar industry for local economic development.

Formulating local standards for electrostatic fume purification equipment can not only guide the development of environmental protection industry in Guangdong Province and maintain the healthy development of catering industry, but also meet the requirements of energy saving and emission reduction, and provide technical support for the "Blue Sky Project" in Guangdong Province.

Three, the preparation ideas and principles, technical basis and domestic and foreign situation:

1, technical application background of the project

At present, the oil fume treatment technologies adopted at home and abroad are mainly divided into three categories in purification mechanism: the first category is electrostatic method; The second is to use mechanical methods such as filtration or inertial collision; The third category is wet treatment methods such as water bath, spray, impact and liquid absorption; Others include high temperature, high energy combustion, photolysis and catalysis, biological method, composite method combining various mechanisms and so on. From the actual market use, electrostatic method is the most widely used, and electrostatic and electrostatic-containing compounds (generally called electrostatic compounds) account for about 80% of the market. Electrostatic method is also the most practical, most suitable and the best purification method for cooking fume.

The principle of electrostatic oil fume purifier is to capture oil fume particles by using electrons emitted by cathode in high-voltage electric field and negative ions generated by collision between electrons and air molecules, so that the oil fume particles are charged, and then the charged oil fume particles are adsorbed by anode under the action of electric field, thus achieving the purpose of purifying oil fume. Electrostatic field has high collection efficiency for submicron particles and can effectively remove fine oil particles without causing secondary pollution; At the same time, ozone produced in the process of gas discharge also plays a certain role in deodorizing.

Soot purifiers have been in China for many years, but the development of the industry has been irregular. Due to increasingly fierce competition, soaring material costs and rising labor costs, some manufacturers or distributors obtain orders through informal means. The main situation is as follows:

The first is to exaggerate the user's on-site air volume, and then improve the handling air volume of the equipment, so that users feel that the price of their own equipment handling air volume per cubic meter is lower. We have encountered such a case. There are only three burners in the kitchen, the air volume of the fan reaches 30,000 cubic meters per hour, and the supporting oil fume purifier also adopts the processing capacity of 30,000 cubic meters per hour. But after our measurement, the actual air volume of the system is less than 10000 m3/hour. In this case, the user chose these devices with large air volume, which seems to be cost-effective, but may actually be cheated.

Second, it only emphasizes the treatment air volume and ignores the treatment effect. The minimum removal efficiency requirements of large, medium and small oil fume purification facilities in national standards are 85%, 75% and 60% respectively. However, for the standard of the maximum allowable emission concentration of 2 mg per cubic meter, it is not enough to achieve the above removal rate with only one equipment. The removal rate of good equipment exceeds the above standard, but through simple calculation, we can know that the cost of equipment with the same air volume treatment efficiency of 84% is twice that of equipment with the removal efficiency of 60%. The cost of equipment with a removal rate of 94% is three times that of equipment with a removal rate of 60%. Therefore, it is unreasonable to look at the price of air volume per cubic meter without considering the removal rate of equipment.

The third is to improve the rate of equipment removal by short-term means in order to cope with the acceptance of management departments. The common method is to install a certain thickness of high-density filter material in the equipment. In this way, a high removal rate can be achieved in a short time, but these filter materials must be removed in as short as one or two days and as long as three or five days, otherwise the discharge will be seriously affected due to blockage.

These practices may help these businesses grab some orders, but in the end it will damage the interests of users and the reputation of the whole industry. Therefore, the industry needs to be further standardized. The country has begun to revise the national standards for fume emission, but there is no relevant standard for fume purification equipment. The local standard "Electrostatic Cooking Oil Fume Purification Equipment" formulated by our company is the standard for regulating the equipment for treating oil fume by electrostatic method. At the same time, I also hope that the industry can establish norms and restrict each other.

With the in-depth implementation of the National Environmental Protection Administration's "Cooking fume emission standard (for Trial Implementation)" (GB18483-2001) and "Technical requirements and testing specifications for cooking fume purification equipment (for Trial Implementation)" (HJ/T 62-2001), the cooking fume treatment technology in the catering industry in China has been promoted continuously. According to article 5. 1 of the standards for the emission of cooking fume in catering industry, "catering enterprises that emit cooking fume must install cooking fume purification facilities and ensure that they operate as required during operation. The unorganized emission of smoke and dust is regarded as exceeding the standard. " The emission standard specified in the standard is 2mg/m3. In order to meet this requirement, catering enterprises must adopt purification treatment. The oil fume concentration without purification equipment is about (10 ~ 20) mg/m3, which definitely exceeds the standard. It is urgent to popularize efficient purification equipment to treat oil fume, so that its emission can meet the relevant national standards and reduce the impact on the environment. With the rapid development of catering industry and the rapid improvement of environmental protection requirements of the country and people, it is more and more important to establish the standard of catering fume purifier.

2, the preparation of ideas and principles:

The formulation of this standard follows three principles:

1) legal principle: product safety meets the requirements of product quality law and environmental protection laws and regulations. According to the implementation of the Notice of the Ministry of Environmental Protection and the State Administration for Industry and Commerce on Strengthening the Environmental Management of Catering and Entertainment Service Enterprises, the cooking fume pollution in the catering industry has been effectively controlled and the environment has been effectively protected. Products that meet this standard also meet the requirements of laws and regulations and the direction of environmental protection.

2) Principle of protecting users' legitimate interests: This standard regulates the appearance, structure and safety performance of products to ensure the safety, effective treatment efficiency and normal service life of products. Following this standard can put an end to counterfeit and shoddy products, ensure the reasonable service life of products, and thus ensure the maintenance of consumers' legitimate interests.

3) Maintain the development principle of the industry: this standard item is the refinement and specific requirements of the current industry standard HJ/T 62-200 1 Technical Specification for Cooking Oil Fume Purification Equipment and Testing (due to the wide application scope of HJ/T 62-200 1, some key performance requirements are too general, which can't actually play a good role in restraining). To ensure the benign development of enterprises with product advantages, enterprises with poor technical conditions should carry out technological innovation, maintain the development of the industry, and protect the living space of manufacturers while protecting the interests of users.

3. Technical basis

This standard refers to the measures of the state and Guangdong Province on environmental protection management of catering industry, and also refers to the following standards:

GB 4706. 1 safety of household and similar electrical appliances part 1 part: general requirements.

GB/T 6553 test method for evaluating the resistance of electrical insulation materials used in harsh environmental conditions to electric trace and corrosion.

GB 9969. 1 general instructions for the use of industrial products

GB/T 16 157 determination of particulate matter in exhaust gas from stationary pollution sources and sampling method of gaseous pollutants

HJ/T 62 "Technical Requirements and Testing Specifications for Cooking Fume Purification Equipment"

HJ/T 397 technical specification for monitoring waste gas from stationary sources

In the general performance requirements of the product, the performance index, market access requirements and the legitimate needs of consumers of the catering fume purification equipment of Crane Company are combined.

4. Domestic and international situation:

In view of the particularity of cooking in China, the huge demand for this kind of oil fume purification technology is mainly at home, while the technology research and development and demand abroad are not as good as at home. At present, all countries in the world have not formulated the emission standards of air pollutants in catering industry, and only the United States and Japan have stipulated them based on fire laws and regulations:

1. Based on the standpoint of fire protection, the fire department of the United States has formulated the equipment standard of oil fume removal device for commercial cooking equipment, mainly focusing on safety control and fire prevention, but it has not clearly stipulated the emission standard of air pollutants.

2. In Japan's Law on the Prevention and Control of Air Pollution, it is only stipulated that "if there are pollution facts, the local environmental protection department may require public and private places to solve the pollution problem by administrative order". In addition, based on the viewpoint of fire prevention, Japan controls it through fire prevention laws and regulations, such as the technical standard of oil fume removal device attached to commercial kitchen equipment formulated by Tokyo Fire Bureau.

3. Hongkong, Taiwan Province and China: There are relevant standards for oil fume emission, such as the draft of "Emission Standards and Regulations for Air Pollutants in Catering Industry" in Taiwan Province Province. Although there are emission standards in China, there are no relevant standards for equipment.

Electrostatic oil fume purification technology appeared as early as 1970s, and has been relatively mature so far, and is gradually becoming the mainstream oil fume purification technology. It is expected that this technology will remain the mainstream technology in the next decade.

Four. Determination of key contents

I) safety performance

Oil fume purifier belongs to civil electromechanical equipment. In order to ensure the safety of users, its low-voltage part must meet the safety requirements of GB 4706.438+0. Because the electrostatic fume purifier must have a high voltage of 5000-20000 volts, it is required that the two poles of the machine body have good insulation performance.

Electrostatic fume purifier is a kind of electrostatic dust removal. When the electric field works, impurities, moisture and accumulated oil mist in dusty gas will inevitably cause electric field discharge (flashover), so the power supply is required to have arc extinguishing function and multiple flashover protection to prevent the accumulated oil fume from catching fire and continuous arc discharge from damaging the high-voltage power supply.

When the two poles of the electric field are short-circuited due to faults or other reasons, although there may be no obvious sparks, the short-circuit may lead to the local temperature rise of the electric field, which may cause the collected oil to catch fire, or damage the power supply due to abnormal high-voltage current, so it is necessary to protect the power supply with high-voltage circuits.

The connection between the high-voltage power supply and the electric field may be disconnected for various reasons, and the high-voltage generator will often cause the voltage to rise sharply due to the loss of load, resulting in the breakdown or damage of the high-voltage power supply. Therefore, the power supply is required to detect the high voltage open circuit fault in time and protect it.

The insulation materials used in high-voltage transformers of high-voltage power supply often have certain temperature limits. Excessive temperature rise will often damage the power supply itself, and it will also breed the danger of oil collection pollution and fire. Therefore, high voltage transformers must be equipped with overheating protection devices.

2) Requirements for insulators

Insulating materials at two poles of electrostatic oil fume purifier are generally exposed to oil fume, and the surface of insulator is easily polluted by oil pollution, resulting in surface creepage. Therefore, it is required that the insulator used has a certain surface creepage distance and the insulator material has a certain electric trace resistance.

In the process of determining the specific parameters of insulation materials' requirements for electric heat tracing, we specially consulted the Secretariat of the National Insulation Materials Standardization Committee (Guilin Electric Appliance Research Institute). According to their suggestions, combined with the actual test results of insulators of our products, we choose to refer to the second level of GB/T 6553, namely 1A2.5 or1B2.5..

3) removal efficiency and body resistance

The smoke removal efficiency and body resistance of the product in different use environments are specified, which are two core indexes of the standard.

This standard requires that under the rated air volume and continuous working conditions, the minimum oil fume removal efficiency of oil fume purification equipment used for high-altitude emission should be not less than 80%, and the minimum oil fume removal efficiency used for low-altitude emission should be not less than 90%. When the treated air volume is 120% of the rated air volume, the minimum oil fume removal efficiency of equipment used for high-altitude emission should be no less than 75%, and that of equipment used for low-altitude emission should be no less than 85%. Because the purification effect of electrostatic fume purifier is closely related to the air volume it processes, the purification efficiency of the same equipment decreases with the increase of air volume. At the same time, the removal efficiency when the rated air volume is 120% is specified, mainly to prevent manufacturers from mishandling the air volume.

Compared with HJ/T 62-2001,we give up the requirement of removal efficiency under the condition of 80% rated air volume. Because according to the removal efficiency curve, the removal efficiency is inversely proportional to the air volume. The removal efficiency that can be achieved under the rated air volume has been achieved and will be achieved at 80% of the rated air volume. Adding this clause only increases the inspection cost and has little practical significance. At the same time, the removal efficiency of 80% rated air volume is lower than that of rated air volume, which is also in line with the actual situation.

The resistance index of this example directly quotes the requirements of HJ/T 62.

IV) Related test methods

This standard specifies the inspection requirements and methods of product appearance, structure, safety, handling air volume and efficiency. Among them, the most important safety tests are electrical safety and insulator inspection tests, including discharge protection, short circuit protection and arc extinguishing function. , which is described in detail in the standard text, is not repeated here. According to the method specified in GB/T 6553, the electrical trace resistance of insulator materials is directly tested. The determination of air volume, wind speed, wind pressure and air volume directly refers to the provisions of GB/T 16 157, HJ/T 62 and HJ/T 397. With these directly measured indicators, the corresponding smoke removal efficiency, rated treatment air volume and body resistance can be calculated, and the calculation formula also directly refers to the above standards.

The standard directly adopts the provisions of HJ/T 62 and HJ/T 397 in the experimental device and operation, but the oil fume concentration is greatly improved and the time is greatly shortened in the initial operation. The purpose of using ultra-high concentration lampblack is to reduce the time spent in testing and increase the operability of testing.

In order to prevent manufacturers from installing high-density filter materials in the equipment to improve the purification efficiency in the product effect test, it is stipulated that the product must work continuously in ultra-high concentration (400 80) mg/m3 oil fume for 2.5 hours before the body resistance test. In fact, the resistance of the new purification equipment is very small, and the original HJ/T 62-200 1 test method does not need simulation operation, which makes the resistance index of the purification equipment fail to achieve the purpose of eliminating inferior products and is easy to be exploited by some manufacturers. This kind of case has a great response in the market.

See table 1 for the determination of other contents and the comparison with HJ/t 62-2001.

The relationship between verbs (abbreviation of verb) and existing standards

1. On the one hand, this standard refines and concretizes the existing industry standard HJ/T 62-200 1 Technical Specification for Cooking Oil Fume Purification Equipment, and at the same time, it modifies the improper clauses found in the practical application of HJ/T 62-200 1.

The main contents and technical requirements of this standard are different from HJ/T 62—200 1. Please refer to the following table:

Table 1 Main technical differences between this standard and HJ/T 62-2001

Digital content/

The requirements of this standard HJ/T 62-200 1.

The electrostatic type is in the range of 1, and the treatment air volume is not specified. The compound type containing static electricity can be referred to. The treated air volume ranges from 2 000 m3/h to 20 000 m3/h. Various types of treated air volume are selected by the market, and the technical requirements of different treated air volumes are consistent.

2 Appearance structure: 1. Need an independent and easy-to-recover oil drain;

2. Insulating parts are not affected by condensed water or other possible liquids in structure.

3, contact with flue gas, should not use flammable or combustible materials 1, no rules.

2. There is no regulation

3. No provision 1: the oil drain is convenient for recycling and equipment use;

2, 3: Consider safety and service life.

3 self-protection performance 1, arc extinguishing function

2, multiple flashover discharge protection

3, short circuit protection

4, high voltage open circuit protection

5. There is no provision for overheating protection of high-voltage cables. The self-protection performance in electrical safety is the basis of equipment work and the guarantee of equipment life.

4 insulator requirements 1, minimum creepage distance;

2. It is stipulated that the electrical tracking resistance should reach 1A2.5 or 1B2.5 1, but it is not specified.

2. There is no specified creepage distance of insulators, which involves safety;

Insulator life is also an important indicator of equipment life.

5. Under the rated air volume of body resistance, the oil fume concentration is (400 80) mg/m3, after running for 2.5 h, it is 300Pa, and the compound type is 600Pa. Under the rated air volume, it is 300Pa, and the compound type is 600Pa. The initial running resistance of purification equipment is very small. However, after some inferior equipment has been running for a period of time, the resistance is getting bigger and bigger and it can't be used. It is meaningful to test the body resistance only after running for a period of time under simulated high-concentration oil smoke.

6 removal efficiency

(Core indicator) At rated air volume, 80% of the air is discharged at high altitude and 90% at low altitude.

When the rated air volume 1.20%, the emission at high altitude is 72%, and that at low altitude is 8 1%, which is less than one year;

The rated treated air volume is 70.6% below 6000m3/h, 85% above 12000 m3/h, and 79% between them.

Run for more than one year:

60% of the rated treated air volume is below 6000m3/h, and 85% is above 12000 m3/h, which is 75% between them.

The rated air volume, 80% rated air volume and 120% rated air volume shall meet the above requirements. According to GB 18483, the allowable emission concentration of cooking fume in catering industry is 2mg/m3. For the normal oil fume of (10-20) mg/m3, the removal rate of 60% can't meet the emission standard, so this requirement is unreasonable. At the same time, specifying the removal efficiency of the equipment after one year of operation has no constraint on the manufacturers, and has no operability and market significance.

The removal efficiency specified in this standard can only meet the allowable emission standards. At the same time, the electrostatic fume purification equipment produced by regular manufacturers can also meet this standard.

According to the relevant environmental protection regulations of Guangdong Province and the mandatory local standard DB44/ 27, emissions can be divided into high-altitude emissions and low-altitude emissions, and low-altitude emissions are obviously much stricter. At the same time, considering that the oil fume emission is mainly in urban areas, the direct impact of high-altitude emission on citizens and the environment will be greatly reduced, so this standard adopts this division. In fact, when oil fume purification equipment is classified according to its use, there are also high-altitude emission equipment and low-altitude emission equipment.

7 Inspection method of removal efficiency The simulated oil fume concentration at the initial stage of operation is (400 80) mg/m3, the operation time is 3 h, and the measured oil fume concentration is (10 2) mg/m3. At the initial stage of operation, the simulated oil fume concentration is 50 mg/m3, the operation time is 24 h, and the measured oil fume concentration is (10 2) mg/m3. 24-hour uninterrupted operation, which is inconvenient in actual detection. Therefore, increasing the concentration of oil fume and shortening the time can increase the feasibility of the experiment and reduce the cost of the experiment. We think the two are equivalent.

8 air leakage rate 10% 5% The requirements of the original standard air leakage rate are too strict, and its test method is not stipulated or observed, and there is no way to implement it in actual operation. This point was communicated with the main drafters of HJ/T 62-200 1.

Air leakage rate is a non-critical index of equipment, and equipment with high air leakage rate can also be judged by visual inspection in operation.

9. The test method of air leakage rate is specified, which is consistent with the current national standards and industry standards. HJ/T 62-2001does not specify the inspection method and calculation method, which makes the original indicators exist in name only.

The service life of 10 products is not directly specified, but the service life of products is guaranteed by performance requirements. The service life index above 1 year lacks maneuverability, and it is difficult to "detect" the factory inspection and type inspection. The service life is related to the use situation, and the regulation is meaningless.

This standard guarantees the service life of products through the requirements of product performance. Under normal use, the service life of products meeting the requirements of this standard can generally reach more than 4 years.

1 1 operation 1 year or more is not specified, which reduces the requirements for removal efficiency. We believe that we should focus on the goal that the allowable emission concentration of oil fume is not higher than 2mg/m3. No matter how long the equipment is used, the equipment that fails to meet this requirement should be eliminated, or users should adopt multiple equipment purification (higher cost) instead of lowering the requirements for equipment.

At the same time, it is not feasible to find equipment that has been used for more than one year for inspection, so it is difficult to restrain manufacturers.

2. This standard does not directly adopt international or foreign advanced standards. However, the performance requirements of UL 867 are used for reference in the gap safety performance requirements of high-voltage components, but there are still obvious differences in the specified indicators due to different requirements. The provisions in the two standards are as follows:

Table 2 Provisions of this standard on minimum surface creepage distance of insulators (Table 1 in the standard)

operating voltage

Minimum surface creepage distance

millimetre

1000-5000 40

500 1- 10000 50

1000 1- 15000 60

1500 1—20000 75

2000 1-25000 90

Table 3 UL 867:2003 Provisions on Clearance between High-voltage Components (Table 22.2 in the Standard)

Minimum electrical clearance and creepage distance of relevant voltage

Between the power pack between the non-insulated high-voltage part and the insulated high-voltage power supply part of the filter unit

Power pack filter unit a

Inch millimeter inch millimeter inch millimeter

60 1—3000 3/4 19.0 1 25.4 1/2 12.7

300 1—5000 1 25.4 1 25.4 1/2 12.7

500 1— 10000 1— 1/8 28.6 1 25.4 3/4 19.0

1000 1— 15000 1— 1/2 38. 1 1 25.4 1 25.4

1500 1—20000 1—3/4 44.5 1— 1/4 3 1.8 1— 1/4 3 1.8

2000 1—25000 2 50.8 1— 1/2 38. 1 1— 1/2 38. 1

A the clearance of the effective filtering area can be less than the specified value to ensure the normal operation of the filter.

Sixth, the technical level:

In view of the particularity of Chinese cooking, this kind of oil fume purification equipment is mainly used to treat Chinese cooking oil fume, and the corresponding technical requirements are mainly in China, while foreign technology research and development and demand are not as good as domestic ones. So this standard has reached the domestic advanced level, that is, the international level. This standard does not directly adopt international or foreign advanced standards. However, in some safety performance requirements, the corresponding safety performance index requirements of UL 867 and other safety standards are used for reference. In practice, meeting the performance requirements of this standard can also meet the requirements of UL safety certification.

Seven. others

This standard is a recommended standard. However, Guangdong province is a big province of catering industry, and the environmental pollution is particularly serious. This standard specifies the treatment air volume, purification efficiency and test methods of products to ensure environmental protection. For the need of environmental protection, relevant government regulations or documents can refer to this standard, making the main technical requirements of this standard mandatory.

The formulation of this standard does not involve patents and patented technologies.