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Xianyang Coal Chemical Industry Air Pollution Control Guiding Opinions were issued

 Last Update: 2023-01-05
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【Chemical Machinery and Equipment Network Policies and Regulations】In order to fully implement Xi Jinping Thought on Ecological Civilization, resolutely rectify the problem of reporting typical cases of the central ecological environmental protection inspectorate, effectively improve the pollution control capacity of the city's coal chemical industry, reduce pollution emissions, and promote the continuous improvement of ambient air quality, the following guiding opinions
are put forward for the air pollution control work of the city's coal chemical industry with reference to relevant national environmental protection policies, industry technical standards and norms.

1.
Scope of governance

Coal chemical enterprises
within the city.
Natural gas to synthetic ammonia and ammonium nitrate enterprises refer to the implementation
.

Second, governance technical requirements

In accordance with the "Environmental Access Conditions for Modern Coal Chemical Construction Projects (Trial)", "Comprehensive Treatment Plan for Volatile Organic Compounds in Key Industries", "Technical Specifications for Pollution Discharge Permit Application and Issuance Coal Processing - Syngas and Liquid Fuel Production" (HJ1101-2020), "Technical Specifications for Application and Issuance of Pollution Discharge Permits - Fertilizer Industry - Nitrogen Fertilizer" (HJ864.
1-2017), "Technical Specifications for Application and Issuance of Pollution Discharge Permits Inorganic Chemical Industry" (HJ1035-2019), The following governance requirements are put forward in documents and standards such as the Technical Guidelines for the Formulation of Emergency Emission Reduction Measures for Key Industries of Heavily Polluted Weather (2020 Revision) (Environmental Protection Office Air Letter [2020] No.
340), Petrochemical Industry Pollutant Emission Standards (GB31571-2015), Volatile Organic Compounds Fugitive Emission Control Standards (GB37822-2019), and Boiler Air Pollutant Emission Standards (DB61/1226-2018):

(1) Use of raw materials

1.
It is forbidden to use coal with high aluminum, arsenic, fluorine, oil and other rare elements that are not yet mature in processing technology, pollution prevention technology or comprehensive utilization technology as raw coal and fuel coal
.

(2) Requirements for pollution control of material storage and transportation

2.
Strictly control the fugitive emissions such as material storage and transportation, and take effective measures
such as sealing and sealing under the premise of ensuring production safety.

3.
Build a fully enclosed coal warehouse or closed coal bunker, hardened ground, and supporting dust suppression facilities
.

4.
Pulverized coal, fly ash, lime, dust removal ash, desulfurization ash and other powdery materials should be transported
by closed belt, closed corridor, tubular belt conveyor or closed carriage, vacuum tanker, pneumatic conveying, etc.

5.
Coal loading and unloading should be closed and sprayed to prevent dust, coal loading points should be set in the closed coal storage yard, as far as possible to use belt conveying and loading, the belt corridor is closed
.
The loader should be loaded in the coal storage shed, and the dust suppression should be sprayed in the coal storage shed during the loading process; When loading, the carrying capacity of the vehicle should be controlled, and the height of coal falling and sprinkling in the cargo box of the vehicle should not be exceeded, and the flat and compacted after loading should be closed and locked to prevent loose coal from falling
.

6.
Coal trestle bridges and coal transfer stations should be all closed, dust removal or dust removal facilities should be built at the same time, and the emission concentration of particulate matter should not be higher than 20mg/m3
.

7.
All heavy cargo vehicles (including gas) or new energy vehicles that meet the emission standards of China V and above are used for road transportation of materials; All transportation vehicles in the factory meet the emission standards of China V and above (including gas) or use new energy vehicles; All non-road mobile machinery in the factory meets the emission standards of China III and above or uses new energy machinery
.

(3) Requirements for the treatment of coal gasification processes

8.
The dust generated by raw coal crushing and screening is effectively collected and processed; The coal preparation, conveying and feeding system adopts measures such as bag dust removal, and the emission concentration of particulate matter is not higher than 20mg/m3
.

9.
Enterprises that reuse process wastewater for coal slurry preparation should effectively collect the fugitive waste gas of the coal grinding workshop, and use measures such as absorption + adsorption to treat
malodor and volatile organic compounds.

10.
The acid gas generated in the transformation section is sent to the boiler for incineration treatment or other recycling processes, and it is forbidden to send the acid gas to the torch for incineration
.

11.
Sulfur recovery tail gas can be used wet desulfurization facilities, and the sulfur dioxide emission concentration is not higher than 50mg/m3; Or send the exhaust gas to the boiler flue gas desulfurization system for treatment
.

12.
Low-temperature methanol washing tail gas adopts other treatment processes such as water washing, and the methanol emission concentration is not higher than 50mg/m3
.

(4) Synthetic ammonia production process governance requirements

13.
The process heating furnace adopts clean fuel and low nitrogen combustion technology, and the nitrogen oxide emission concentration is not higher than 100mg/m3
.

14.
Methane-rich tail gas in natural gas synthetic ammonia tail gas should recover by-product liquefied natural gas products or be used as fuel gas; Liquid nitrogen washing tail gas, molecular sieve regeneration gas, ammonia synthesis air, ammonia tank relaxation gas should take water washing, condensation, membrane separation, PSA and other measures to recover ammonia and hydrogen or use as fuel gas, and those that cannot be recovered should be sent to the ammonia torch for full combustion and shall not be directly discharged
.

15.
The particulate matter in the exhaust of the ammonium nitrate granulation tower (machine) adopts purification and recovery technologies such as bag dust removal and wet dust removal; The emission concentrations of particulate matter and NH3 during granulation tower are not higher than 30mg/m3 and 40mg/m3
, respectively.
The emission concentration of particulate matter and NH3 during granulation by the granulator is not higher than 30mg/m3
.

16.
Selective catalytic reduction technology (SCR) is adopted for nitrogen oxides in nitric acid synthesis exhaust gas, the nitrogen oxide emission concentration is not higher than 200mg/m3, and the nitrogen oxide emission is not higher than 0.
68kg/t nitric acid (100%)
.

(5) Methanol/ethanol production process governance requirements

17.
Methanol flash vapor, hydrogen recovery tail gas, pre-distillation non-condensable gas, etc.
in the process of methanol synthesis are used as fuel gas, and the torch system that cannot be recovered due to system safety problems shall be fully burned and shall not be directly discharged
.

18.
The non-condensable gas produced by dimethyl ether refining, methanol recovery tower, ethanol refining tower and methanol distillation column in the ethanol synthesis process is used as fuel gas, and the torch system that cannot be recovered due to system safety problems should be fully burned and shall not be directly discharged
.

19.
The process heating furnace adopts clean fuel and low nitrogen combustion technology, and the nitrogen oxide emission concentration is not higher than 100mg/m3
.

(6) Ethylene glycol production process governance requirements

20.
Ethylene glycol synthesis unit DMO unit methyl nitrite recovery tower tail gas adopts absorption treatment technology
.

21.
The exhaust gas of ethylene glycol synthesis device adopts absorption, thermal oxidation and other treatment technologies
.

(7) Requirements for pollution control of public auxiliary projects

22.
Power station: coal-fired boiler flue gas adopts high-efficiency desulfurization, denitrification and dust removal measures, the emission concentration of nitrogen oxides in flue gas is not higher than 50mg/m3, the emission concentration of flue gas particulate matter is not higher than 10mg/m3, the emission concentration of sulfur dioxide is not higher than 35mg/m3, the mercury emission concentration is not higher than 0.
03mg/m3, the ammonia emission concentration of SCR denitration measures is not higher than 2.
5mg/m3, and the ammonia emission concentration of SNCR denitration measures is not higher than 8mg/
。

23.
Flare system: The exhaust gas treated by the flare system is limited to flammable gases
that cannot be effectively recovered under emergency conditions such as process equipment shutdown, fire accidents, public works accidents and other accidents.
Non-combustible exhaust gases with a high proportion of nitrogen and other gases shall not be discharged into the flare gas system; The supporting gas system shall ensure the timely, safe and reliable combustion of flare gas, and its emissions can meet the requirements of
environmental management.

24.
Storage tanks: increase the treatment of storage tanks, and use low-pressure tanks, pressure storage tanks or other equivalent measures
for storing volatile organic liquid storage tanks with a real vapor pressure ≥ 76.
6kPa 。 For the storage of volatile organic liquid storage tanks with a real vapor pressure ≥ 27.
6kPa but 76kPa and a tank volume ≥of 75m3, and volatile organic liquid storage tanks with a real vapor pressure of ≥ 5.
2kPa but 27.
6kPa and a storage tank volume ≥of 150m3, one of the following provisions shall be met: (1) a floating roof tank shall be used, and for the inner floating roof tank, the floating roof and the tank wall should be used before the immersion seal, mechanical shoe seal and other efficient sealing methods; For the outer floating roof tank, a double seal should be used between the floating roof and the tank wall, and the primary seal should adopt high-efficiency sealing methods
such as immersion sealing and mechanical shoe sealing.
(2) The use of fixed top should adopt absorption, adsorption, condensation, membrane separation and other recovery combination technologies, non-methane total hydrocarbons and methanol emission concentrations are not higher than 120mg/m3, 50mg/m3 respectively or the treatment efficiency is not less than 90%.

(3) Adopt gas phase balance system
.
(4) Adopt other equivalent measures
.
If the storage tank takes terminal treatment measures, it is necessary to ensure stable operation
.
Encourage enterprises to send waste gas containing VOCs to process heating furnaces, boilers, etc.
for direct combustion treatment, and pollutant emissions meet the requirements
of relevant emission standards in the petrochemical industry.

25.
Loading and unloading: methanol, ethylene glycol and other chemicals soluble in water should be absorbed by water, and other combined technologies such as absorption, adsorption, condensation, membrane separation, oxidative combustion should be used, and the emission concentrations of non-methane total hydrocarbons and methanol should not be higher than 120mg/m3 and 50mg/m3
, respectively.
During the loading operation of liquid ammonia and methylamine, the residual ammonia and methylamine in the filling joint are absorbed by water washing and purged and recovered by nitrogen to minimize the fugitive emissions
in the filling process.

26.
Circulating water station: The open circulating water system carries out at least once every six months the monitoring of total organic carbon (TOC) or purge organic carbon (POC) at the import and export of the circulating water tower and the heat exchange equipment containing VOCs, and if the export concentration is greater than 10% of the imported concentration, the source of the leakage point should be traced and repaired
in time.

27.
Sewage treatment station: VOCs monitoring concentration at 100mm above the open liquid surface of wastewater storage and treatment facilities containing VOCs≥ 100umol/mol should use a floating top cover, or use a fixed top cover to collect to the VOCs waste gas collection and treatment system
.
The top cover should have anti-corrosion performance, the closed cover plate should be close to the liquid level, and the negative pressure should be collected
.
When the VOCs monitoring concentration of 100mm above the open liquid surface is ≥100umol/mol when the VOCs monitoring concentration is 100umol/mol using the ditch transport, the inlet and discharge should be closed, and the inlet and discharge outlet should be taken to isolate from the air
.
The waste gas of the sewage treatment station should adopt regenerative oxidation, biological drip filtration + activated carbon adsorption/incineration and other treatment technologies
.

(8) Requirements for pollution control under abnormal working conditions

28.
In the process of starting and stopping work, the shutdown and return process should be optimized, all kinds of resources and energy should be rationally used, and the generation and emission
of various pollutants should be reduced.

29.
The purging process of the production device should give priority to the use of closed purging process to maximize the recovery of materials, reduce emissions, select suitable cleaning agents and purging media, and the purging gas should be connected to organic waste gas recovery or flare treatment
.

30.
In the case that it is difficult to establish a closed steaming tank, clean and purge the product closed discharge pipe network, mobile equipment is used to treat the exhaust gas
during the maintenance process.

31.
Under daily circumstances, in order to maintain sufficient accident drainage buffer capacity, the accident emergency pool should be kept empty
.
In the non-accident state, if it is necessary to occupy the accident emergency pool due to material leakage, wastewater treatment facilities not up to standard, etc.
, the occupied volume shall not exceed 1/3, and it shall be vacated in time, and it shall have the ability
to be urgently evacuated within 30 minutes at the time of the accident.

32.
It is forbidden to extinguish the torch system long lights; The flare burning system is only used for emergency treatment, and cannot be used as a daily air pollution treatment facility; Volatile organic compounds and odorous substances entering the flare at any time should be able to ignite and burn sufficiently; Set up a video surveillance device
in the flare system.

(9) Other governance requirements

33.
The enterprise carries out the leakage detection and repair (LDAR) work of equipment and pipe valves, and establishes the enterprise sealing point file and leakage detection and repair plan
.
There are ≥,000 sealing points for equipment and pipeline components carrying gaseous VOCs materials and liquid VOCs materials, and leakage detection and repair work
should be carried out.
Pumps, compressors, agitators, valves, open valves or open lines, pressure relief equipment, sampling connection systems are tested every 6 months
.
Flanges and other connections, other sealing equipment are tested every
12 months.
Except for sealing points listed for delayed repair, leak points should be repaired
within 15 days.

34.
Anti-corrosion, waterproof and anti-rust coating of enterprise production facilities should avoid summer or use low VOCs content paint
.

35.
Environmental protection treatment facilities improve the operation rate
of treatment facilities in accordance with the principle of "first start and then stop" with production equipment.

36.
Improve the exhaust gas collection rate
in accordance with the principle of "collect everything".
Promote the cancellation of the bypass of the exhaust emission system, if it must be retained due to safety production and other reasons, the list of retained bypass should be reported to the local ecological and environmental department, and the bypass should be kept closed in non-emergency situations, and supervision should be strengthened through lead sealing, installation of automatic monitoring facilities, flow meters, etc.
, and after opening, it should be reported to the local ecological and environmental department in time and make account records
.

37.
Other air pollution prevention and control implement relevant technical regulations and policy requirements
.

3.
Ecological environment management

38.
Set up full-time management departments or allocate full-time management personnel, and have corresponding ecological environment management capabilities
.

39.
Complete archives such as EIA approval, completion environmental protection acceptance documents, pollution discharge permits and implementation reports, operation and management regulations for waste gas treatment facilities, and emergency plans for environmental emergencies
.

40.
Production facility operation management information (production time, operating load, product output, etc.
); Operation and management information of waste gas pollution control facilities (amount and time of replacement of dust removal filter material, amount and time of addition of desulfurization and denitrification agent, amount and time of carbon-activated replacement, etc.
); Monitoring record information (exhaust gas monitoring report, etc.
); Records of consumption of major raw and auxiliary materials; Specification of environmental management ledger records such as fuel consumption records
.

41.
Make inspection and maintenance records, and promptly disclose environmental information related to abnormal working conditions to the public, accept social supervision, promptly carry out post-event assessment after the accident and report
to the environmental protection department as soon as possible.

42.
The status of VOCs fugitive emissions in the factory area of the enterprise is monitored online, the enterprise formulates an online monitoring plan, clarifies the monitoring point, quantity and monitoring method, and reports the monitoring plan to the Municipal Ecology and Environment Bureau for filing after expert demonstration, and the automatic monitoring data should be networked
with the Xianyang City Air Quality Comprehensive Control and Control Platform.

Original: Xianyang coal chemical industry air pollution control guidance issued issued

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