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A coke oven flue gas desulfurization and denitrification process

A coke oven flue and waste gas desulfurization technology, which is applied in coke ovens, coke oven heating, combustible gas heating coke ovens, etc., can solve the problems of secondary pollution, high energy consumption, and high operating costs, so as to prolong the service life, Energy saving and investment reduction effect

Active Publication Date: 2017-04-19
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] In order to solve the problems of secondary pollution, high operating costs and high energy consumption in desulfurization and denitrification of coke oven flue exhaust gas in the prior art, the present invention provides a coke oven flue exhaust gas desulfurization and denitrification process

Method used

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  • A coke oven flue gas desulfurization and denitrification process
  • A coke oven flue gas desulfurization and denitrification process

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Embodiment 1

[0051] A coke oven flue gas desulfurization and denitrification process. The coke oven gas used for heating the coke oven is first used to remove sulfur compounds and impurities by a dry desulfurization process in which a desulfurization tower and an adsorption tower are connected in series to obtain purified coke oven gas. The coke oven flue gas produced by the combustion in the coke oven is under the action of the low-temperature SCR denitrification catalyst, and the nitrogen oxides in the flue gas are removed through the SCR reaction and then discharged up to the standard. The exhaust flue gas reaches the highest standard specified in GB16171-2012.

[0052] The present invention adopts a dry coke oven gas desulfurization + coke oven flue gas low-temperature SCR denitrification process. The prior art generally adopts a coke oven flue gas semi-dry desulfurization + low-temperature SCR denitrification process. The specific comparison is shown in Table 2:

[0053] Table 2. Compariso...

Embodiment 2

[0056] A coke oven flue gas desulfurization and denitrification process. The coke oven gas used for heating the coke oven is first used to remove sulfur compounds and impurities by a dry desulfurization process in which a desulfurization tower and an adsorption tower are connected in series to obtain purified coke oven gas. The coke oven flue gas produced by the combustion in the coke oven is under the action of the low-temperature SCR denitrification catalyst, and the nitrogen oxides in the flue gas are removed through the SCR reaction and then discharged up to the standard. The exhaust flue gas reaches the highest standard specified in GB16171-2012.

[0057] The total sulfur content of the purified coke oven gas is 30mg / m 3 .

[0058] The dry desulfurization process of the present invention is a conventional coke oven gas dry desulfurization process:

[0059] The desulfurizing agent in the desulfurization tower is iron oxide, and the desulfurizing agent is regularly replaced after...

Embodiment 3

[0062] A coke oven flue gas desulfurization and denitrification process. The coke oven gas used for heating the coke oven is first used to remove sulfur compounds and impurities by a dry desulfurization process in which a desulfurization tower and an adsorption tower are connected in series to obtain purified coke oven gas. The coke oven flue gas produced by the combustion in the coke oven is under the action of the low-temperature SCR denitrification catalyst, and the nitrogen oxides in the flue gas are removed through the SCR reaction and then discharged up to the standard. The exhaust flue gas reaches the highest standard specified in GB16171-2012.

[0063] The total sulfur content of the purified coke oven gas is 35mg / m 3 .

[0064] The temperature range of the low-temperature SCR denitration catalyst is 160°C to 290°C.

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Abstract

The invention provides a desulfurization and denitrification process for a coke oven flue gas. The desulfurization and denitrification process comprises the following steps: by adopting a desulfurization tower and a dry-process desulfurization process which is in series connected with an adsorption tower, removing sulfur-containing compounds and impurities for the coke oven coal gas used for heating the coke oven to obtain purified coke oven coal gas; combusting the purified coke oven coal gas in the coke oven to generate the coke oven flue gas; and under the action of the low-temperature SCR (selective catalytic reduction) denitrification catalyst, realizing up-to-standard emission after removing nitrogen oxides in the flue gas through the SCR reaction. According to the desulfurization and denitrification process disclosed by the invention, heating is not needed, and denitrification can be directly performed, so that the denitrification efficiency can reach the highest standards defined in GB16171-2012. Meanwhile, the investment is reduced and the energy resources are saved.

Description

Technical field [0001] The invention relates to the technical field of control of coke oven flue waste gas pollutants, in particular to a coke oven flue waste gas desulfurization and denitration process. Background technique [0002] my country's SO 2 And NO x Emissions are among the highest in the world. Studies have shown that gas phase SO 2 , NO x Is the precursor of PM2.5, produced by SO 2 , NO x The amount of PM2.5 converted by precursors such as VOCs and VOCs is more than that of direct emissions. SO 2 , NO x It is one of the main substances that form acid rain. The air pollution and acid rain caused by the problem are becoming more and more serious. It has serious harm to human health and ecosystems. It has become a factor restricting the sustainable development of my country's economy and society. [0003] On June 27, 2012, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine jointly issued the "Emission ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02C10K1/32B01D53/90B01D53/56C10B21/10
Inventor 任毅李东林
Owner CHENGDU HUAXITANG INVESTMENT
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