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Acid Production Process by Coupling Coke Oven Flue Gas Waste Heat and Sulfur Pollutants

A technology for flue gas waste heat and pollutants, which is used in gas treatment, combined devices, and greenhouse gas reduction. It can solve the problems of ineffective recovery of coke oven flue gas waste heat, poor operation stability, frequent system blockage, etc., and achieve increased value. , the effect of improving humidity and efficient recycling

Active Publication Date: 2020-09-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] (1) In the existing coke oven flue gas desulfurization process, the sulfur pollutants have not been effectively recycled and utilized, and the by-products of desulfurization are mostly solid waste, causing secondary pollution to the environment;
[0015] (2) The existing coke oven flue gas desulfurization and denitrification process fails to efficiently recover the waste heat of coke oven flue gas, and the flue gas undergoes repeated heat exchanges during the desulfurization process, resulting in low energy efficiency;
[0016] (3) The existing coke oven flue gas semi-dry desulfurization combined with SCR denitrification process has frequent system blockage and poor operation stability

Method used

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  • Acid Production Process by Coupling Coke Oven Flue Gas Waste Heat and Sulfur Pollutants
  • Acid Production Process by Coupling Coke Oven Flue Gas Waste Heat and Sulfur Pollutants
  • Acid Production Process by Coupling Coke Oven Flue Gas Waste Heat and Sulfur Pollutants

Examples

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Effect test

Embodiment 1

[0052] This embodiment discloses a first denitrification and then desulfurization process, specifically as follows:

[0053] Such as figure 2 As shown, adjust the regulating valve 700c on the coke oven horizontal flue 700 so that the coke oven flue gas discharged along the coke oven flue gas outlet 110 of the coke oven 100 flows out along the horizontal flue 700a at the exit section of the coke oven combustion chamber and passes through the heater 500 After heating up to 380°C, it enters the SCR denitration reactor 600 and mixes with supplementary ammonia and air, and enters the denitration catalyst bed of the denitration reactor 600 together, and NH is generated on the surface of the denitration catalyst. 3 The denitrification reaction of reducing NOx, the flue gas after denitrification also contains sulfur dioxide gas, so it is the flue gas before desulfurization after denitrification, and the flue gas before desulfurization after denitrification enters the heat exchanger 4...

Embodiment 2

[0055] This embodiment discloses a first denitrification and then desulfurization process, specifically as follows:

[0056] Such as figure 1 As shown, the regulating valve 700c on the coke oven horizontal flue 700 is adjusted so that the coke oven flue gas discharged along the coke oven flue gas outlet 110 of the coke oven 100 flows out along the horizontal flue 700a at the exit section of the coke oven combustion chamber, and then passes through the second changer. Heater 500a exchanges heat with flue gas after denitrification and before desulfurization, then is heated up to 380°C by heater 500 and then sent to SCR denitrification reactor 600, mixed with supplementary ammonia and air, and enters the denitrification catalyst bed of denitrification reactor 600 together layer, NH occurs on the surface of the denitration catalyst 3 The denitrification reaction of reducing NOx, the obtained flue gas after denitrification and before desulfurization circulates into the second heat...

Embodiment 3

[0058] This embodiment discloses a first desulfurization and then denitrification process, specifically as follows:

[0059] Such as image 3 As shown, the regulating valve 700c on the coke oven horizontal flue 700 is adjusted so that the coke oven flue gas discharged along the coke oven flue gas outlet 110 of the coke oven 100 flows out along the horizontal flue 700a at the exit section of the coke oven combustion chamber and is divided into three gas streams. Pipeline, a gas pipeline is part of the coke oven flue gas bubbling into the dilute acid concentrator 200, which directly contacts with dilute sulfuric acid for heat exchange, humidification, and cooling, and then leaves the dilute acid concentrator 200 and sends it to the carbon-based catalytic desulfurization acid production device 300, one gas pipeline is for part of the coke oven flue gas to be directly sent to the carbon-based catalytic desulfurization acid production device 300, and the other gas pipeline is for p...

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Abstract

The invention relates to a process for producing acid by coupling coke oven flue gas waste heat and sulfur pollutants, and belongs to the field of energy saving and environmental protection in the coking industry. The process includes first denitrification and then desulfurization process. The coke oven flue gas drawn from the coke oven horizontal flue is sent to the SCR denitrification reactor. It is divided into two parts, one part of the gas enters the dilute acid concentration device, directly contacts with dilute sulfuric acid for heat exchange, humidification, and mixes with the other part of the gas that directly enters the carbon-based catalytic desulfurization acid production device to obtain flue gas after temperature regulation and humidity regulation. The flue gas after temperature and humidity adjustment is catalyzed in the carbon-based catalytic desulfurization acid production device to obtain sulfuric acid and flue gas after desulfurization and denitrification. into the chimney. The process of the invention links the acid production with sulfur pollutants and coke oven flue gas waste heat together, not only increases the value of desulfurization by-products, but also recovers the waste heat of flue gas.

Description

technical field [0001] The invention relates to the recovery and utilization of coke oven flue gas, belongs to the field of energy saving and environmental protection in the coking industry, and in particular relates to a process of coupling coke oven flue gas waste heat and sulfur pollutants to produce acid. Background technique [0002] According to statistics, in the past two years, the annual SO 2 The total emissions of NOx and NOx are more than 18 million tons. Coal coking is one of the main pollution sources in the field of industrial coal. Coke oven flue gas is the most important source of exhaust gas pollution in coking enterprises. About 60% of SO 2 And 90% of NOx comes from this. [0003] Coke oven flue gas (referred to as coke oven flue gas) is the product of coke oven gas combustion, and its main components are CO 2 、H 2 O, N 2 , SO 2 , NOx, etc., among them, SO 2 , NOx is a pollutant that affects the environment. Because coke oven waste gas is continuousl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D50/00B01D53/56F23J15/02F23J15/06F23J15/08
CPCB01D53/8637F23J15/02F23J15/022F23J15/06F23J15/08F23J2215/20F23J2215/10B01D2251/2062B01D2258/0283B01D50/20Y02E20/30
Inventor 吴高明涂红兵卢丽君曹素梅万菲
Owner 武汉钢铁有限公司
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