Low-temperature coke oven flue waste gas cleaning technology and equipment thereof

A technology of coke oven flue and chemical equipment, applied in chemical instruments and methods, separation of dispersed particles, ammonium sulfate, etc.

Inactive Publication Date: 2015-02-18
SEEWATER ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the coke oven flue gas temperature, SO 2 , NO x Parameters such as carbon dioxide and soot content are different from other industries where ammonia desulfurization has been widely used. Therefore, designing a reasonable ammonia desulfurization process suitable for the coking industry and reducing ammonia escape has become an important factor restricting the popularization and application of this technology. one of the factors

Method used

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  • Low-temperature coke oven flue waste gas cleaning technology and equipment thereof

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Embodiment 1

[0070] A low-temperature coke oven flue gas cleaning process, the process includes a low-temperature denitrification process and an ammonia desulfurization process;

[0071] The specific steps are:

[0072] (1) Ammonia is mixed with hot air to form a mixed gas of ammonia and air;

[0073] (2) The coke oven flue gas is mixed evenly with the mixed gas of ammonia and air, and the catalyst catalyzes denitrification;

[0074] (3) The denitrified coke oven flue gas is sequentially desulfurized with the atomized ammonium sulfate secondary circulation fluid and the atomized ammonium sulfate primary circulation fluid and then discharged;

[0075] When using the atomized ammonium sulfate primary circulating fluid for desulfurization reaction, the denitrified coke oven flue gas is sprayed with the upper, middle and lower layers of the ammonium sulfate primary circulating fluid in sequence; the upper layer of the ammonium sulfate primary circulating fluid The pH value is 6, the pH value...

Embodiment 2

[0092] A low-temperature coke oven flue gas cleaning process, the process includes a low-temperature denitrification process and an ammonia desulfurization process;

[0093] The specific steps are:

[0094] (1) Ammonia is mixed with hot air to form a mixed gas of ammonia and air;

[0095](2) The coke oven flue gas is mixed evenly with the mixed gas of ammonia and air, and the catalyst catalyzes denitrification;

[0096] (3) The denitrified coke oven flue gas is sequentially desulfurized with the atomized ammonium sulfate secondary circulation fluid and the atomized ammonium sulfate primary circulation fluid and then discharged;

[0097] When using the atomized ammonium sulfate primary circulating fluid for desulfurization reaction, the denitrified coke oven flue gas is sprayed with the upper, middle and lower layers of the ammonium sulfate primary circulating fluid in sequence; the upper layer of the ammonium sulfate primary circulating fluid The pH value is 5.5, the pH valu...

Embodiment 3

[0115] A low-temperature coke oven flue gas cleaning process, the process includes a low-temperature denitrification process and an ammonia desulfurization process;

[0116] The specific steps are:

[0117] (1) Ammonia is mixed with hot air to form a mixed gas of ammonia and air;

[0118] (2) The coke oven flue gas is mixed evenly with the mixed gas of ammonia and air, and the catalyst catalyzes denitrification;

[0119] (3) The denitrified coke oven flue gas is sequentially desulfurized with the atomized ammonium sulfate secondary circulation fluid and the atomized ammonium sulfate primary circulation fluid and then discharged;

[0120] When using the atomized ammonium sulfate primary circulating fluid for desulfurization reaction, the denitrified coke oven flue gas is sprayed with the upper, middle and lower layers of the ammonium sulfate primary circulating fluid in sequence; the upper layer of the ammonium sulfate primary circulating fluid The pH value is 5.7, the pH val...

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Abstract

The invention relates to a low-temperature coke oven flue waste gas cleaning technology and equipment thereof. According to the technology, residual ammonia water of a coking plant is recycled, and a low-temperature SCR denitration technology and an ammonia desulfuration technology are combined; ammonia produced by evaporating the residual ammonia water produced by an ammonia evaporation working process of the coking plant is used as a denitration reducing agent; denitration is performed by adopting a low-temperature denitration catalyst by a selective catalysis reducing method; the denitration catalyst is of a honeycomb briquette type structure; SO2 in coke oven waste gas is removed by the ammonia desulfuration technology; the residual ammonia water of the coking plant and a byproduct (NH4)2SO4 are recycled, and secondary pollutants such as wastewater, waste gas and waste slag are avoided. The equipment consisting of all units is matched with the corresponding technology; high-efficiency desulfuration and denitration are realized, the ammonia escape rate is low, the byproduct (NH4)2SO4 can be produced, and considerable economical benefit is achieved; the relevant national environment-friendly policy requirement is met, and the running cost of desulfuration and denitration of a coking enterprise is lowered.

Description

technical field [0001] The invention relates to a coke oven flue gas cleaning process, in particular to a process for removing nitrogen oxides and sulfur oxides from coke oven flue gas at a temperature between 170°C and 250°C, which belongs to coal coking Industry air pollution prevention and control field. Background technique [0002] Coke oven flue gas is the waste gas produced after the combustion of coke oven gas used to produce coke by dry distillation of clean coal, mainly containing SO 2 , NO X and other pollutants. In 2013 alone, the SO in the coke oven flue gas of domestic coking plants in my country 2 The emissions were about 758,600 tons, accounting for 2 4% of total emissions; NO X The emissions were about 6.0688 million tons, accounting for the domestic NO X 27% of total emissions. [0003] In June 2012, the Ministry of Environmental Protection and the State Administration of Quality Supervision, Inspection and Quarantine jointly issued the "Coking Chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/96B01D53/56B01D53/50C01C1/24
Inventor 王文波王仁升王颜亭
Owner SEEWATER ENVIRONMENTAL ENG
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