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Direct ammonia water injection device suitable for medium-and-low-temperature SCR denitration

An ammonia water and denitrification technology, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of high energy consumption and high operation cost of ammonia water, and achieve the effect of reducing operation and maintenance costs and reducing energy and medium consumption.

Pending Publication Date: 2021-07-09
北京首创大气环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a medium and low temperature SCR denitrification ammonia water direct injection device suitable for steel plants, coke oven plants, etc., to realize the rapid evaporation effect of ammonia water, and to solve the problems of high energy consumption and high operating cost of ammonia water evaporation in the existing denitrification technology

Method used

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  • Direct ammonia water injection device suitable for medium-and-low-temperature SCR denitration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the direct injection device suitable for medium and low temperature SCR denitrification ammonia water is set as follows:

[0028] Such as figure 1 As shown, it includes compressed air delivery unit, ammonia water delivery unit and SCR reaction unit;

[0029] The SCR reaction unit includes an inlet flue 8, an SCR reactor 9 and an outlet flue 10 connected in sequence, four dual-fluid atomizing nozzles 7 are arranged in the inlet flue 8, and the dual-fluid atomizing nozzles are supported in the reactor flue;

[0030] The compressed air delivery unit includes a compressed air storage tank 2 connected to the air compressor 1, the compressed air storage tank 2 is connected to the two-fluid atomizing nozzle 7 through a compressed air pipeline, and the compressed air pipeline is sequentially connected by a pneumatic regulating valve through a pipeline. , the filter 3 and the metering distribution module 6 are composed;

[0031] The ammonia water delivery u...

Embodiment 2

[0034] In this embodiment, the direct injection device suitable for medium and low temperature SCR denitrification ammonia water is set as follows:

[0035] The denitrification ammonia water direct injection device includes compressed air delivery unit, ammonia water delivery unit and SCR reaction unit;

[0036] The SCR reaction unit includes an inlet flue 8, an SCR reactor 9 and an outlet flue 10 connected in sequence, and a dual-fluid atomizing nozzle 7 is arranged in the inlet flue 8, and the dual-fluid atomizing nozzle is supported in the reactor flue;

[0037] The compressed air delivery unit includes a compressed air storage tank 2 connected to the air compressor 1, the compressed air storage tank 2 is connected to the two-fluid atomizing nozzle 7 through a compressed air pipeline, and the compressed air pipeline is sequentially connected by a pneumatic regulating valve through a pipeline. , the filter 3 and the metering distribution module 6 are composed;

[0038] The ...

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Abstract

The invention relates to a direct ammonia water injection device suitable for medium-and-low-temperature SCR denitration. The device comprises an inlet flue, an SCR reactor and an outlet flue which communicate with each other in sequence, wherein at least one double-fluid atomizing nozzle is arranged in the inlet flue; a compressed air storage tank connected with an air compressor is sequentially connected with a valve, a filter and a metering distribution module and finally connected to the double-fluid atomizing nozzle through pipelines; and at least one ammonia water conveying pump connected with an ammonia water storage tank is sequentially connected with the valve, the filter and the metering distribution module and finally connected to the double-fluid atomizing nozzle through pipelines. By arranging the double-fluid atomizing nozzle, ammonia water is atomized into fine water mist particles under the help of compressed air, the fine water mist particles are sprayed into a flue and mixed with flue gas, and the atomized ammonia water can be rapidly evaporated and decomposed into NH3, so the rapid evaporation effect of the ammonia water can be achieved; and an ammonia water evaporator in an original ammonia water evaporation system is omitted, consumption of energy media such as electricity or steam is reduced, operation and maintenance cost is lowered, and the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to a denitrification ammonia water direct injection device, in particular to a medium and low temperature SCR denitrification ammonia water direct injection device. Background technique [0002] Nitrogen oxides (NO, NO 2 , N 2 O) are the main source of air pollution, they can produce photochemical smog, acid rain, ozone hole and greenhouse effect. With my country's increasing emphasis on environmental protection, it is imperative for my country's coking and steel industry to meet the emission standards for flue gas. The flue gas denitrification in the iron and steel and coking industries basically adopts SCR denitrification technology. SCR denitrification technology is a selective catalytic reduction technology. Under the action of a catalyst and the presence of oxygen, NH 3 Preferentially react with NOx for reduction and removal to generate N 2 and H 2 0. The desulfurized flue gas enters the SCR reactor through the flue, a...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/90
CPCB01D53/8631B01D53/8696B01D53/90B01D2251/2062
Inventor 王小磊董会然张峰李媛媛
Owner 北京首创大气环境科技股份有限公司