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Method for accelerating selective non-catalytic reduction of nitrogen oxides

A nitrogen oxide, non-catalytic technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low denitration efficiency of SNCR technology, limited residence time of reducing agent, narrow temperature range, etc. Shorter time, simple transformation, and the effect of widening the temperature range

Inactive Publication Date: 2008-08-20
TSINGHUA UNIV
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Problems solved by technology

[0005] The temperature range suitable for SNCR reaction is relatively narrow. Under the condition that the temperature in the boiler flue drops rapidly, the residence time of the reducing agent is limited, and it is difficult for the injected reducing agent to fully react with the NOx in the flue gas, resulting in low denitrification efficiency of SNCR technology. , while ammonia leakage is higher

Method used

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  • Method for accelerating selective non-catalytic reduction of nitrogen oxides
  • Method for accelerating selective non-catalytic reduction of nitrogen oxides
  • Method for accelerating selective non-catalytic reduction of nitrogen oxides

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for promoting SNCR denitrification process by adding superfine coal powder additive, comprising SNCR reducing agent supply device 4, reducing agent nozzle 5, superfine coal powder additive supply device 6.

[0031] Such as figure 1 As shown, the fuel burns inside the furnace 3 to generate flue gas containing NOx. The temperature of the flue gas drops to about 1000°C at the position of the folded flame angle 10, reaching a temperature suitable for the SNCR reaction. After that, the flue gas flows into the convective heat exchange zone. The temperature dropped rapidly and dropped to less than 900°C at the rear of the secondary superheater, leaving the optimum SNCR reaction temperature range. The reductant nozzle 5 is arranged at the position of the deflection angle 10, the reductant is supplied by the reductant supply device 4 and injected into the SNCR reaction zone 7 through the nozzle 5, and the injected amount of the SNCR reductant is expressed as NH 3 The m...

Embodiment 2

[0034] A process for adding natural gas additives to promote SNCR denitrification process, comprising SNCR reducing agent supply device 4, reducing agent nozzle 5, and natural gas additive supply device 6.

[0035] Such as image 3 As shown, the fuel burns inside the furnace 3 to generate flue gas containing NOx. The temperature of the flue gas drops to about 1000°C at the position of the folded flame angle 10 and reaches a temperature suitable for the SNCR reaction. After that, the flue gas flows into the rear part of the reaction zone 8 , the temperature drops rapidly, and drops to less than 900°C at the rear of the secondary superheater, leaving the optimum SNCR reaction temperature range. A multi-layer reducing agent nozzle 5 is arranged at the position of the deflection angle 10 and between the superheater and the reheater. The reducing agent is supplied by the reducing agent supply device 4 and injected into the SNCR reaction zone 7 and the rear part of the reaction zone...

Embodiment 3

[0038] A process for adding syngas additives to promote SNCR denitrification process, comprising SNCR reducing agent supply device 4 and reducing agent nozzle 5, syngas additive supply device 6 and additive nozzle 9.

[0039] Such as Figure 5 As shown, the fuel burns inside the furnace 3 to generate flue gas containing NOx. The temperature of the flue gas drops to about 1000°C at the position of the folded flame angle 10 and reaches a temperature suitable for the SNCR reaction. After that, the flue gas flows into the rear part of the reaction zone 8 , the temperature drops rapidly, and drops to less than 900°C at the rear of the secondary superheater, leaving the optimum SNCR reaction temperature range. The reducing agent nozzle 5 is arranged at the position of the deflection angle 10. The reducing agent is supplied by the reducing agent supply device 4 and sprayed into the SNCR reaction zone 7 through the reducing agent nozzle 5. The injection amount of the SNCR reducing age...

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Abstract

The invention relates to a promoting method for selective non-catalytic reduction (SNCR) of nitrogen-oxide, which is a technological method of adding addition agent to promote the denitrification process in the SNCR denitrification process for the power plant boiler and industrial furnace and other members, belonging to the nitrogen-oxide control technical field. The invention discloses a SNCR nitrogen-oxide method with the coal dust, natural gas or syngas as addition agent, in allusion to the problem of narrow suitable temperature range and lacking retention time existing in general SNCR denitrification technical application, which is characterized in that: the denitrification reaction rate is increased; the temperature range suitable for SNCR reaction is widen; the denitrification rate is increased and the leakage of ammonia is decreased. The promoting SNCR nitrogen-oxide method has advantages that: the reform is simple; the implementing is easy; the adoptive addition agent is cheap and available; the dosage is a little, so the combust process in the furnace is not influenced and no obvious secondary pollution is brought.

Description

technical field [0001] The invention relates to a process method for performing selective non-catalytic reduction (SNCR) of nitrogen oxides on combustion equipment such as power plant boilers, industrial boilers, and pollution control systems for removing NOx in flue gas by using an amino reducing agent. Background technique [0002] Coal-fired power plant boilers and industrial boilers emit a large amount of nitrogen oxide (NOx) pollution. The severe situation of nitrogen oxide pollution requires the control of NOx produced by the combustion of various boilers. Reducing NOx emissions through combustion control can no longer meet the increasingly stringent emission standards. Among further NOx control technologies, selective catalytic reduction (SCR) technology has high denitrification efficiency, but the investment is also the highest. At the same time, the transformation of existing units There are difficulties. Reburning and denitrification change the combustion mode in ...

Claims

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Application Information

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IPC IPC(8): B01D53/56
Inventor 蔡宁生张彦文李振山胥波
Owner TSINGHUA UNIV
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