Waste Gas Treatment Technology in Coking Field
■ Sewage node analysis：
|
section |
Introduction of Treatment Process in Workshop Section |
Main Points of Exhaust Emission |
Exhaust Gas Composition |
Causes of Pollution |
Exhaust gas characteristics |
|
cold drum section |
The temperature of raw gas exported from the carbonization chamber reaches 650~700℃, and ammonia water is generally used for cooling in this process. |
Tar storage tank, tar intermediate tank, ammonia tank, underground water sealing tank, tar slag outlet, etc |
NH3, H2S, HCN, naphthalene, phenol, benzene, tar, etc. |
Steam emission, gas entrainment; fluctuation of liquid level, respiratory exhaust; |
Low emission concentration; High temperature (< 80℃); Continuous and stable discharge |
|
desulfuration section |
H2S and HCN in the gas after preliminary cooling are removed, and NH3in the gas is absorbed at the same time. |
Mother liquid tank, ammonia tank, accident tank, molten sulfur kettle, regeneration tank, crystallization tank |
NH3, H2S and a small amount of VOCs, etc |
Volatilization of hot material and unorganized diffusion of discharge; Liquid level fluctuation, breathing and exhausting; |
Low VOCs concentration and high ammonia concentration; Exhaust gas temperature is higher (< 50℃); Continuous and stable discharge |
|
ammonium sulphate section |
Spray saturator ammonium sulfate process is widely used to produce ammonium sulfate, while immersion saturator ammonium sulfate process is gradually replaced by spray saturator ammonium sulfate process. |
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crude benzene section |
Generally, washing oil is used to absorb benzene series, and then the rich oil is rectified to remove benzene for benzene series recovery. |
Poor oil tank, crude benzene storage tank, oil washing tank, rich oil tank, underground tank, slag outlet of regenerator, etc. |
Benzene series, heavy oil, etc. |
Volatilization of hot materials; Fluctuation of cold material level and volatilization of materials in tank farm; Unstructured volatilization of benzene residue; Steam balance |
The gas volume fluctuates greatly, the exhaust gas concentration is high, and it is discharged at normal temperature |
|
Sewage treatment section |
The quality of sewage discharged from each process is different. According to the concentration of pollutants and biodegradability, the sewage will be classified and disposed. |
Accident pool, regulating pool, anoxic pool, aerobic pool, grease trap, sludge pressure filter room, etc. |
NH3, H2S, benzene, etc. |
During aeration, the mixing of liquid phase, gas entrainment and volatilization are accelerated; Steam emission or volatilization emission. |
The waste gas is at normal temperature, and the discharge is continuous and stable |
■Case show:
Case 1: Treatment of VOCs tail gas in Shanxi Luhe Group Yuanzhong Coking Co., Ltd.
Air volume: 10000m³/h
Source of waste gas: volatile waste gas from desulfuration section, ammonium sulphate section, cold drum section and crude benzene section
Main design technology: Acid washing spray +high efficiency UV+ water washing spray
Case 2: Collection and Treatment of Closed Odor of Shanxi Taiyue Coking Co., Ltd. Sewage Treatment Station Area
Air volume：15000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology：Alkali washing spray+ biological deodorization +high efficiency UV+ coke adsorption
Case 3: Collection and Treatment of Closed Odor in Pool Body of Guxian Zhengtai Coal Gasification Co., Ltd
Air volume: 13000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: Alkali washing spray+ biological deodorization + demist +high efficiency UV+ coke adsorption+ water washing spray
Case 4: Collection and treatment of malodorous gases in the sewage treatment station of phenol-cyanogen section of Yuanzhong Coking Plant of Shanxi Luhe Group
Air volume: 25000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: FRP capping+ Alkali washing+ deodorization washing spray+ UV+ activated carbon+ water processing
Case 5: Collection and Treatment of Closed Odor in Pool Body of Shaanxi Dongling Smelting Co., Ltd. Sewage Treatment Plant
Air volume: 40000 m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: FRP capping+ Alkali washing spray+ water washing spray+ combined biological deodorization device+ UV
Case 6: Collection and Treatment of Closed Odor in Pool Body of Guxian Lida Coking Co., Ltd. Sewage Treatment Plant
Air volume: 15000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: FRP capping+ Alkali washing spray+ biological deodorization + demist+ UV+ water washing spray
Case 7: Collection and Treatment of Closed Odor in Pool Body of Guxian Jinyu Coking Co., Ltd. Sewage Treatment Plant
Air volume: 20000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: FRP capping+ Alkali washing spray+ biological deodorization + demist+ UV+ water washing spray
Case 8: Collection and treatment of malodorous gases in the sewage treatment station of phenol-cyanogen section of Guxian Jinhua Coking Co. Ltd
Air volume: 16000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: FRP capping+ Alkali washing spray+ biological deodorization + demist+ UV+ water washing spray
Case 9: Cover deodorization project of biochemical phenol-cyanogen wastewater treatment station in Xinyu Coking Plant
Air volume: 20000m³/h
Source of waste gas: The pool body in the sewage treatment station area emits odor
Design technology: Alkali washing+ biological washing +demist+ advanced photocatalytic oxidation+ coke adsorption
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