GB 17054-1997 Hygienic standard for coke oven emissions in workshop air

This standard specifies the maximum permissible concentration, time-weighted average permissible concentration and monitoring test methods of coke oven emissions (referring to benzene solubles) in workshop air. This standard applies to the furnace roof, furnace side and other operations of the coking workshop of a coking plant. It does not apply to other workshops other than the coking workshop of a coking plant. GB 17054-1997 Hygienic Standard for Coke Oven Emissions in Workshop Air GB17054-1997 Standard download decompression password: www.bzxz.net

GB17054-1997
This standard is formulated for the first time based on the epidemiological study of occupational tumors and on-site labor hygiene survey data and with reference to the occupational exposure limits of relevant foreign carcinogens. It is a hygienic standard used for workplace environmental monitoring and health supervision. This standard shall be implemented from December 1, 1998. Appendix A of this standard is the appendix of the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. This standard is drafted by the Labor Hygiene Research Institute of Anshan Iron and Steel Company. The main drafters of this standard are: Dong Defu, Fan Chengyuan, Wang Zhongxu, Liu Lu, and Zhang Ming. This standard is interpreted by the Chinese Academy of Preventive Medicine, the technical management unit entrusted by the Ministry of Health. 608
1 Scope
National Standard of the People's Republic of China
Health standard for coke oven emissions in the air of workplace
GB17054—1997
This standard specifies the maximum allowable concentration, time-weighted average allowable concentration and monitoring and inspection methods of coke oven emissions (referring to benzene solubles) in workplace air.
This standard applies to the furnace roof, furnace side and other operations of the coking workshop of a coking plant. It does not apply to other workshops other than the coking workshop of a coking plant.
2 Hygiene requirements
The maximum allowable concentration of coke oven emissions (benzene solubles) in workplace air is 0.2mg/m3, and the time-weighted average allowable concentration is 0.15mg/m3.
3 Monitoring and inspection methods
The monitoring and inspection method of this standard adopts the method for determining benzene solubles in workplace air. Sampling is to collect total particulate matter in the workplace air with glass fiber filter paper, and use benzene to ultrasonically elute the benzene soluble components of the total particulate matter in the filter paper sample, dry and weigh, and calculate the concentration of benzene soluble matter in the workshop air. For details, see Appendix A (Appendix to the standard).
Approved by the State Administration of Technical Supervision on November 11, 1997 and implemented on December 1, 1998
A1 Principle
GB17054-. 1997
Appendix A
(Appendix to the standard)
Determination method of coke oven emissions (benzene soluble matter) in workshop air Coke oven emissions in the air are sampled with glass fiber filter paper, ultrasonically eluted with benzene, and part of the eluent is evaporated to dryness and weighed. A2 Instrument
A2.1 Aluminum alloy sampling clamp or dust sampling clamp. A2.2 Dust sampler, flow rate 30L/min. A2.3 Glass fiber filter paper: 40mm in diameter, baked at 500℃ for 30min before use. A2.4 Test tube: 10mL.
A2.5 Sand core funnel: G3 type, 40mL.
A2.6 Conical flask: 50mL.
Pipette: 5ml., 10mL.
A2.8 Tweezers. Www.bzxZ.net
Ultrasonic cleaner: power above 50W.
Balance: sensitivity 0.00001g.
A2.11 Weighing bottle: outer diameter 30mm, height 20mm. A2.12 Electric vacuum drying oven.
A3 Reagents
A3.1 Nitrogen.
A3.2 Benzene.
A4 Sampling
Put the glass fiber filter paper into the sampling clip and collect air samples of more than 1m2 at a flow rate of 20L/min. The collected samples are stored in a light-proof sampling box to avoid contamination and loss. A5 Analysis Steps
A5.1 Control Test
A blank value control test must be carried out for each batch of samples analyzed. The blank value is determined using two blank filter papers. Except for not collecting air, the rest of the operations are the same as the samples, and the average value of the two blank filter papers is used as the blank control for each batch of samples. A5.2 Sample Processing
Put the sampled glass fiber filter paper and blank filter paper into a 50mL conical flask, add 5mL of benzene, place it in an ultrasonic cleaner for elution for 10min, transfer the eluate and filter paper to a sand core funnel, use a 10mL test tube to receive the filtrate, and press the filter paper dry with nitrogen. Put the filter paper back into the original conical flask, add 5ml benzene, ultrasonically elute for 5min, transfer the filter paper and eluent to the sand core funnel again, and filter with nitrogen to f. Collect the two filtrates in the same test tube, and add benzene to make the total volume reach 10mL. Use the following device to filter with nitrogen: connect a three-way tube to the partial pressure gauge of the nitrogen bottle, and connect the remaining two ends of the three-way tube to a single-hole rubber stopper at one end. The rubber stopper is wrapped with aluminum foil and installed on the top of the sand core funnel. Use a spiral clamp to adjust the nitrogen pressure at the other end. Take 5mL or 10mL of eluent (depending on the sample concentration) and put it in a weighing bottle with constant weight in advance. Put the weighing bottle in a constant temperature vacuum drying oven, and evaporate all the benzene to dryness at 60C and reduced pressure (when evaporating benzene, it should be done in a gas cabinet). A5.3 Determination
Take the evaporated weighing bottle out of the drying oven, put it into the desiccator, and place it in the balance room for 30 minutes. Then weigh it with a balance until the difference between the two weighing values ​​is no more than 0.02 mg, and take the average value as the weighing value; the temperature and humidity should be kept constant during weighing. A6 Calculation
A6.1 Convert the sampling volume into the volume under standard conditions according to formula (A1): V. VX
Where: V.
Convert to the sample volume under standard conditions, m\; V-sample volume, m~,
Temperature, ℃;
Atmospheric pressure, kPa.
Calculate the concentration of coke oven emissions in the air according to the following formula: 101.3
c=(m1-m2)/Vc
Wherein: c-
coke oven emissions concentration, mg/m;
sample mass, mg;
m2--blank mass, mg;
A7 Explanation
Convert to sample volume under standard conditions, m. (A1)
A7.1The detection limit of the method is twice the standard deviation of the values ​​measured based on 6 blank filter papers. The detection limit of this method is 0.05mg. The minimum detection concentration is 0.05mg/m2 (sample 1m2 of air). A7.2The recovery rate of benzene solubles after two ultrasonic elutions is 99.3%. The relative standard deviation of A7.36 samples with an average content of 0.18 mg is 8.9%, and the relative standard deviation of 6 samples with an average content of 1.01 mg is 3.4%.
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