Low temperature continuous denitrification process for coke oven smoke and reactor thereof

A reactor and denitrification technology, applied in gas treatment, chemical instruments and methods, membrane technology, etc., can solve problems such as difficult to meet the needs of coking enterprises, block catalyst pores, reduce denitrification efficiency, etc., to reduce investment costs and floor space , good regeneration effect, and the effect of reducing operating costs

Inactive Publication Date: 2017-01-18
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of coke oven flue gas, heating the flue gas requires a large amount of fuel, resulting in high operating costs, which are difficult to meet the needs of coking enterprises; using low-temperature denitrification catalysts to remove nitrogen oxides from coke oven flue gas, its removal The efficiency can meet the requirements, but the catalyst is easy to generate viscous substances such as ammonium bisulfate and ammonium sulfate when it interacts with sulfur-containing coke oven flue gas under low temperature conditions, which will block the catalyst pores and reduce the denitrification efficiency (research shows that when the exhaust gas temperature is lower than 270 ° C , ammonia easily reacts with sulfur trioxide to form ammonium bisulfate, ammonium sulfate and other substances; when the exhaust gas temperature is higher than 300°C, ammonium bisulfate, ammonium sulfate and other substances are easily decomposed to form NH 3 , SO 3 and H 2 O etc.)

Method used

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  • Low temperature continuous denitrification process for coke oven smoke and reactor thereof
  • Low temperature continuous denitrification process for coke oven smoke and reactor thereof
  • Low temperature continuous denitrification process for coke oven smoke and reactor thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] See attachedfigure 1 and 2 , a low-temperature continuous denitrification reactor for coke oven flue gas is an SCR denitrification reactor, which is divided into four independent areas A, B, C and D. There are insulation facilities between each area, and each area is equipped with an independent Differential pressure transmitter (2), coke oven flue gas inlet pipe valve (3), heat source gas valve (4), rectification grid (5), denitrification catalyst (6), soot blower (9), temperature sensor (10), NH 3 Concentration detector (11). The SCR denitration reactor (7) is placed on the reactor support (8).

[0036] Among them, the denitrification catalyst is a low-temperature sulfur-resistant denitrification catalyst, V 2 o 5 -WO 3 / TiO 2 A series of catalysts, with 3 layers; the pressure difference transmitter (2) is used to monitor the pressure difference between the inlet and outlet of the denitration reactor, which can indirectly reflect the damage caused by the deposit...

Embodiment 2

[0044] See attached figure 1 and 2 , a low-temperature continuous denitrification reactor for coke oven flue gas is an SCR denitrification reactor, which is divided into four independent areas A, B, C and D. There are insulation facilities between each area, and each area is equipped with an independent Differential pressure transmitter (2), coke oven flue gas inlet pipe valve (3), heat source gas valve (4), rectification grid (5), denitrification catalyst (6), soot blower (9), temperature sensor (10), NH 3 Concentration detector (11). The denitration reactor (7) is placed on the reactor support (8).

[0045] Among them, the denitrification catalyst is a low-temperature sulfur-resistant denitrification catalyst, V 2 o 5 -WO 3 / TiO 2 A series of catalysts, with 3 layers; the pressure difference transmitter (2) is used to monitor the pressure difference between the inlet and outlet of the denitration reactor, which can indirectly reflect the damage caused by the depositio...

Embodiment 3

[0054] See attached figure 1 and 3 , a low-temperature continuous denitrification reactor for coke oven flue gas is an SCR denitrification reactor, which is divided into six areas: A, B, C, D, E, and F. Each area is independent of each other. There are insulation facilities between each area. There are independent differential pressure transmitters (2), coke oven flue gas inlet pipe valves (3), heat source gas valves (4), rectification grids (5), denitrification catalysts (6), soot blowers in the area. device (9), temperature sensor (10), NH 3 Concentration detector (11). The denitration reactor (7) is placed on the reactor support (8).

[0055] Among them, the denitrification catalyst is a low-temperature sulfur-resistant denitrification catalyst, V 2 o 5 -WO 3 / TiO 2 A series of catalysts, with 3 layers; the pressure difference transmitter (2) is used to monitor the pressure difference between the inlet and outlet of the denitration reactor, which can indirectly refle...

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Abstract

The invention discloses a low temperature continuous denitrification process for coke oven smoke and reactor thereof. The reactor is divided into 2-9 individual regions, in between the regions are installed with heat insulation facilities, inside each of the regions are arranged with denitrification catalyst, a rectification grille, a soot blower, a pressure difference transmitter, an air inflow pipe for coke oven smoke, and more. When ammonium bisulfate, ammonium sulfate and other sticky substances generated by the reaction of SO2 and NH3 in the oven smoke, consolidate by large amount on the catalyst surface, causing the drop of catalyst activity in certain region of the reactor, the air intake valve is closed for smoke in the associated region, and hot air supply is plugged into the associated region, speeding up the decomposition by heat of ammonium bisulfate, ammonium sulfate and other substances, the denitrification catalyst is regenerated, with no effect on the running of denitrification devices in the remaining regions. The present invention is simple to operate, safe and reliable, with less area occupied, and low operating cost.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a coke oven flue gas low-temperature continuous denitrification process and a reactor thereof. Background technique [0002] Coke oven flue gas is the waste gas produced after the combustion of coke oven gas, mainly SO 2 , NO x It is one of the most polluting industries. As the country pays more and more attention to air pollution control, the control of coke oven flue gas pollutants (especially nitrogen oxides) is imminent. [0003] The temperature of coke oven flue gas is usually low, between 200°C and 300°C. The current mature Selective Catalytic Reduction (SCR) denitrification technology in the power industry is suitable for flue gas temperatures between 300°C and 420°C. Therefore, conventional medium-high temperature SCR denitrification technology is not suitable for coke oven flue gas denitrification, and low-temperature denitrification catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8625B01D53/8631B01D53/90B01D2251/2062B01D2255/903B01D2258/0283
Inventor 张向辉李敬王蕾胡洧冰王磊
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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