1 - Scope

This standard specifies the technical requirements, testing techniques and inspection rules for the removal efficiency and other performance of cooking fume purification equipment in the catering industry.

This standard is applicable to the detection of removal efficiency and other performance of oil fume purification equipment generated during cooking and video production, and is applicable to oil fume purification equipment with a processing air volume of 2000m³/h ~ 20000m³/h.

2 - Normative references

The provisions contained in the following standards constitute the provisions of this standard through reference in this standard.

GWPB 5——2000 Food and Beverage Industry Fume Emission Standard

GB/T 16157 Determination of particulate matter in exhaust gas from stationary sources and sampling methods for gaseous pollutants

GB 191 Pictorial markings for packaging, storage and transportation

GB/T 6388 Shipping and receiving marks for transport packaging

GB/T 9969.1 Instructions for use of industrial products

GB/T 13306 Labels

3 - Terms and Definitions

The following terms and definitions apply to HJ/T 62

3.1 - Standard state

Refers to the state when the temperature is 273K and the pressure is 101325 Pa. The concentration values ​​and air volume treated specified in this standard are dry flue gas values ​​under standard conditions.

3.2 - Cooking fume

Refers to the mixture of volatile oils, organic matter, thermal oxidation and thermal cracking produced during food cooking and food production and processing.

3.3 - Cooking fume control equipment

Refers to equipment that purifies oil fumes generated during cooking and food production.

3.4 - Fume removal efficiency

It refers to the percentage of the mass of oil fume removed from the catering industry after it is treated by purification equipment compared to the mass of the oil fume before treatment.

3.5 - Mechanical fume purification equipment

Refers to purification equipment that removes oil smoke by filtration, inertial collision, adsorption or other mechanical principles.

3.6 - Wet fume purification equipment

Refers to purification equipment that removes oil smoke using liquid absorption principles such as water film, spray, and impact.

3.7 - Electrostatic fume purification equipment

Refers to purification equipment that uses the principle of electrostatics to remove oil smoke.

3.8 - Composite oil fume purification equipment

4 - Technical requirements

4.1 - Basic Requirements

4.1.1 - At rated air volume, the body resistance of wet fume purification equipment and electrostatic fume purification equipment should be less than 300Pa, and the body resistance of mechanical fume purification equipment and composite fume purification equipment should be less than 600Pa.

4.1.2 - The oily dirt and wastewater separated and collected by fume purification shall not be discharged directly to cause secondary pollution. The solid waste such as filter materials replaced by mechanical fume purification equipment shall be centrally processed and shall not cause secondary pollution.

4.1.3 - Electrostatic fume purification equipment should have eye-catching safety warnings and reliable grounding to ensure personal and equipment safety.

4.1.4 - The grounding resistance of the electrical control box should be less than 2Ω.

4.1.5 - Have complete technical documents, including design instructions, drawings, corporate standards, etc.

4.1.6 - The product appearance should be smooth and clean to facilitate installation, care and maintenance.

4.2 - Technical requirements for testing

4.2.1 - Under laboratory test conditions, the oil fume removal efficiency of oil fume purification equipment at rated processing air volume conditions shall meet the requirements of Table 1. For the removal efficiency test of equipment with an operating time of less than 1 year, the test value shall be corrected according to Table 1 multiplied by the operating time correction factor K.

Minimum removal efficiency limit of oil fume purification equipment

4.2.2 - Under normal use conditions, the continuous operation time of the equipment should not be less than 1 year.

4.2.3 - The removal efficiency of oil fume purification equipment that has been in operation for more than 1 year shall meet the minimum removal efficiency requirements in Table 1.

4.2.4 - The insulation resistance between the two plates of the electrostatic fume purification equipment shall not be less than 50MΩ.

4.2.5 - The wet fume purification equipment has good demisting performance and the moisture content of the flue gas at the exhaust pipe outlet is less than 8%.

4.2.6 - The oil fume purification system should be well sealed and the air leakage rate of the equipment itself should be less than 5%.

5 - Detection system and test methods

5.1.1 - Ventilation duct connection system

The ventilation duct connection system includes oil fume purification equipment, fans, connecting ducts, sampling holes and air volume regulating valves, as shown in Figure 1. The wind speed in the inlet and outlet air connection ducts of the oil fume purification equipment should be less than 20m/s. The inlet and outlet air connection ducts should each have a straight pipe section of 4.5 times the diameter (or equivalent diameter). A sampling hole is set at 3 times the diameter (or equivalent diameter) downstream of elbows, reducers and other pipe fittings. For rectangular ducts, the equivalent diameter D = 2AB/(A+B), where A and B are the side lengths. The layout of sampling points shall be carried out in accordance with Chapter 7 of GB/T 16157.

5.1.2 - Fume generating device

The oil fume generating device simulates the actual smoke composition by quantitatively adding edible vegetable oil and water to the heating melter to make it smoke, splash and vaporize, so as to continuously and stably generate oil fume. The equipment mainly includes two parts: an adjustable oil and water quantitative addition system and an electric heating temperature control system, as shown in Figure 2. The oil fume generating device should ensure that the average oil fume concentration change is less than 5% in 10 minutes. The oil fume generating device can adjust the oil fume generation amount to meet different gas treatment volume and concentration requirements. The detection reference concentration is 10mg/m³.

5.2 Test methods

5.2.1 - Temperature measurement shall be by glass thermometer or thermocouple with an accuracy of not less than 2.5%.

5.2.2 - Velocity, flow rate and pressure shall be measured in accordance with Chapter 7 of GB/T 16157, using standard Pitot tube or S-type Pitot tube, inclined tube manometer, U-type manometer and atmospheric pressure gauge. Other calibrated measuring instruments with the same accuracy may also be used.

5.2.3 - Insulation resistance: Use a 2.5-level 2500V megohmmeter to measure the resistance between the two poles of the electric field body. Grounding resistance: Use a 2.5-level multimeter to measure the resistance between the metal casing and the grounding bolt.

5.2.4 - The various equipment, instruments and detection methods for oil fume sampling and analysis shall be carried out in accordance with the provisions of Appendix A of GWPB 5-2000.

5.2.5 - The appearance of the fume purification equipment shall be inspected by visual inspection.

5.2.6 - The moisture content of the flue gas at the outlet of the wet fume purification equipment shall be determined by the weighing method in accordance with the provisions of Chapter 5 of GB/T 16157. It can also be determined by using a dry-bulb thermometer or the condensation method when a heated sampling tube is used.

5.2.7 Calculation of removal efficiency of oil fume purification equipment

P = (1 - (C _before × Q _before - C _after × Q _after ) / (C _before × Q _before )) × 100%;

P: oil fume purification and removal efficiency (%);

C _before : oil fume concentration before purification equipment (mg/m³);

Q _before : Flue gas flow rate before purification equipment (m³/h);

CAfter _: oil fume concentration after purification equipment (mg/m³);

Q _after : flue gas flow after purification equipment (m³/h);

5.2.8 - Determination of the removal efficiency of fume purification equipment under laboratory conditions

After the oil fume purification equipment in the test system has been running for 24 hours at rated air volume and simulated oil fume concentration of 50 mg/m³, adjust the smoke volume to simulated oil fume concentration of 10 mg/m³ (±2 mg/m³) to measure the oil fume concentration and air volume at the inlet and outlet of the equipment, calculate the oil fume purification efficiency at rated air volume according to 5.2.7, and make corrections with the time correction factor. Take the average value of the two parallel measurement results and report it.

The air volume on the detection system was changed to 80% and 120% of the rated air volume on the nameplate and the simulated fume concentration was adjusted accordingly to measure the fume removal efficiency of the fume purification equipment.

The test items and results of laboratory tests should comply with the requirements of Table 2.

5.2.9 - Performance test of equipment that has been in operation for more than 1 year

The oil fume purification equipment manufacturer shall provide a list of five or more users who have been in operation for more than one year, and an approved oil fume purification equipment testing agency shall select two units for operation time investigation and test them using an oil fume generator. The test items and results shall comply with the requirements of Table 2.

Testing items and requirements for oil fume purification equipment

6 - Testing regulations

6.1 - Inspection categories

Product inspection is divided into factory inspection and type inspection.

6.2 - Factory Inspection

The factory inspection items and results shall comply with the requirements of Table 2.

6.3 - Type inspection

6.3.1 - Products shall be subject to type inspection when any of the following conditions apply:

a) New product identification;

b) Significant changes in product materials or production processes affect product performance;

c) Resuming production after continuous suspension for more than two years;

d) Three years of regular production;

e) National quality inspection agencies put forward inspection requirements.

6.3.2 - Inspection items

When conducting general type inspection, the inspection items should include all items of laboratory tests or on-site tests specified in Table 2.

6.3.3 - Sampling Methods

Random sampling should be carried out from no less than two production batches, with a sampling quantity of no less than 2 units.

6.3.4 - After the inspection, fill in the "Inspection Report", the content format of which refers to Table 3, and attach the test data report.

6.4 - Decision Rules

6.4.1 - The type inspection results shall comply with the relevant provisions of Chapter 4.

6.4.2 - If two of the test items 1 to 6 listed in Table 2 fail or any of the test items 7 to 13 fail, double sampling inspection is required. If both fail, the product is deemed unqualified.

6.5 - Other Provisions

6.5.1 - For equipment of the same type with different specifications, the test results are valid according to the rated air volume of the tested equipment, large, medium and small respectively. The test results of large equipment are valid within the range of not more than 150% of the rated air volume of the tested equipment.

6.5.2 - For oil fume purification equipment with a processing air volume greater than 20,000 m³/h, separate project acceptance and routine monitoring of pollution sources should be carried out.

7 - Labels and instructions for use

7.1 - Signage

7.1.1 - Each product must have a label which shall comply with GB/T 13306.

7.1.2 - Product labeling should include the following main contents:

a) Product name, specifications and model;

b) Air volume, purification efficiency, maximum inlet fume concentration, and equipment resistance;

c) Manufacturer’s name, address and contact information;

d) The product’s production date and product number;

7.2 - Instructions for use

The product must be provided with an instruction manual, which should comply with the requirements of Chapter 1 of GB/T 9969. It must specify the requirements for equipment installation, transportation, and maintenance, as well as the maintenance period and service life of the equipment.

8 - Logo packaging transportation storage

The marking, packaging, transportation and storage of products shall be carried out by each production unit in accordance with the relevant provisions of GB/T 6388 and GB 191 based on the characteristics of the product type.

Content of inspection report