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Coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process

A coke oven flue and waste gas desulfurization technology, which is applied in air quality improvement, chemical instruments and methods, and dispersed particle filtration, can solve problems such as high operating costs, high energy consumption, and secondary pollution, and achieve recovery of waste heat, Low energy consumption and low exhaust gas temperature

Inactive Publication Date: 2016-01-06
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The present invention solves the secondary pollution, high operating cost, high energy consumption, coke oven leakage of SO 2 To solve the problem of excessive emissions, an integrated process for desulfurization and denitrification of coke oven flue gas and waste heat recovery is provided

Method used

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  • Coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process
  • Coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process
  • Coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process

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Embodiment 1

[0050] The present invention adopts coke oven flue gas low-temperature SCR denitrification + dry desulfurization process. The prior art generally adopts coke oven flue gas semi-dry desulfurization + low-temperature SCR denitrification process. See Table 1 for specific comparison:

[0051] Table 1. Comparison between the integrated process of desulfurization, denitrification and waste heat recovery of the present invention and the prior art

[0052]

Embodiment 2

[0054] An integrated process of coke oven flue gas desulfurization and denitrification and waste heat recovery. Under the action of low-temperature SCR denitrification catalyst, coke oven flue gas removes nitrogen oxides in flue gas through SCR reaction, and reduces coke through waste heat boiler. After the furnace flue gas temperature, spray sodium-based dry powder absorbent to the flue gas for desulfurization, desulfurization for secondary use, and then filter to remove particulate matter in the coke oven flue gas, and finally discharge up to the standard. The exhaust gas can meet the highest standard required by GB16171-2012. The desulfurized products collected by the filter are sent to the power plant for desulfurization for secondary use.

[0055] The waste heat boiler described is a heat pipe natural circulation waste heat boiler. The existing technology generally adopts a flue-type water pipe natural circulation waste heat boiler. The specific comparison is shown in Tab...

Embodiment 3

[0059] An integrated process of coke oven flue gas desulfurization and denitrification and waste heat recovery. Under the action of low-temperature SCR denitrification catalyst, coke oven flue gas undergoes SCR reaction to remove nitrogen oxides in flue gas, and waste heat is recovered through waste heat boiler Finally, the flue gas is desulfurized by spraying sodium-based dry powder absorbent to the flue gas, and the desulfurized flue gas is dedusted by a filter before being discharged up to standard.

[0060] 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 coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process. Coke oven flue waste gas is subjected to an SCR reaction under the effect of a low-temperature SCR denitrification catalyst to remove nitric oxides in flue waste gas, a sodium-based dry powder absorbent is sprayed to flue waste gas for desulfurization after waste heat is recovered through a waste heat boiler, and desulfurized flue waste gas is discharged up to standard after dust removal is conducted through a filter. The process is free of waste water, waste gas emission and heating, denitrification can be directly conducted, the absorbent can be recycled, investment is reduced, and energy is saved.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas pollutant control and heat recovery, in particular to an integrated process of coke oven flue gas desulfurization and denitrification and waste heat recovery. Background technique [0002] Pollutants emitted from coke oven chimneys, mainly containing SO 2 , NO X and dust particles. Studies have shown that gaseous SO 2 , NO X It is the precursor of PM2.5, dust particles are the main component of PM10, composed of SO 2 , NO X The amount of PM2.5 transformed by precursors such as VOCs and VOCs is more than that emitted directly. SO 2 , NO X Dust particles are the main substances that form smog and acid rain. In recent years, my country's SO 2 , NO X Air pollution and acid rain have caused serious harm to human health and ecosystems, and have become important factors restricting the sustainable development of my country's economy and society. The government and society have also p...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/83B01D53/60B01D46/02
CPCY02A50/20
Inventor 任毅李东林周礼唐茂辉陈洪会
Owner CHENGDU HUAXITANG INVESTMENT
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