Method for denitrating gas fume

A flue gas and denitrification technology, applied in the field of flue gas denitrification, can solve problems such as low denitration rate, and achieve the effects of improving denitration efficiency, avoiding rapid failure and reducing costs

Active Publication Date: 2012-12-05
CHINA SHENHUA ENERGY CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a flue gas denitrification method with a higher denitrification rate in order to overcome the disadvantages of the lower denitrification rate in the SNCR process and the SCR process in the prior art

Method used

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  • Method for denitrating gas fume
  • Method for denitrating gas fume
  • Method for denitrating gas fume

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0018] According to one embodiment of the present invention, the disturbance medium is an inert medium that does not react with flue gas and denitrification agent, and is determined according to site conditions and cost accounting, preferably water vapor, air, nitrogen and group zero in the periodic table One or more elements, so that new impurities will not be introduced into the flue gas due to disturbance, and the flue gas after denitrification can be discharged directly.

[0019] According to another embodiment of the present invention, the disturbance medium is flue gas or a mixture of denitration agent and flue gas. The flue gas used as the disturbance medium may be flue gas that has undergone denitration treatment or has not been treated with denitration treatment. When the flue gas without denitration treatment is used as the disturbance medium, on the one hand, there is no need to supply the disturbance medium from the outside, and on the other hand, the flue gas with...

Embodiment 1

[0048] This example is used to illustrate the flue gas denitrification method provided by the present invention.

[0049] use figure 1 The flue gas denitrification equipment shown implements flue gas denitrification. The flue gas denitrification equipment includes a flue 1 and a denitration agent supply device 2, a denitrification agent supply device 3, a disturbance device 4 and a catalyst bed 5 arranged in the flue 1 in sequence. , where the flue is surrounded by 20G carbon steel pipes with a diameter of 60 mm. The cross-section of the flue is a rectangle of 10 meters x 6 meters. The 20G carbon steel pipes are equipped with demineralized water for power plant boilers. The flue has a first vertical section a, a horizontal section b, and a second vertical section c, and the two ends of the horizontal section b communicate with the upper parts of the first vertical section a and the second vertical section c respectively. A vertical section a has a height of 30 meters, a horiz...

Embodiment 2

[0056] This example is used to illustrate the flue gas denitrification method provided by the present invention.

[0057] Adopt the same flue gas denitration equipment as in Example 1 to implement flue gas denitrification, specifically, through the denitrification agent supply device 2, the urea aqueous solution with a concentration of 39% by weight is sent into the flue, and the temperature is 1000 ° C, and the flow rate is 778,000 cubic meters. m / hour of flue gas from power plant boilers (the content of nitrogen oxides is 350mg / Nm 3 ) to mix, so that the ammonia nitrogen molar ratio of the urea aqueous solution to the nitrogen oxides in the flue gas is 0.3:1, and the contact time between the flue gas and the urea aqueous solution is 1.2 seconds. And add the urea aqueous solution (at this moment, the temperature of above-mentioned first mixture is 850 ℃) that concentration is 39% by weight (at this moment, the temperature of above-mentioned first mixture is 850 ℃) in the firs...

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Abstract

The invention provides a method for denitrating gas fume. The method comprises the following steps of: contacting the gas fume with a denitrating agent under the condition of selective non catalyst reduction of the gas fume to obtain a first mixture; supplementing the denitrating agent and injecting a disturbing medium into the first mixture respectively to obtain a second mixture; and contactingthe second mixture with a catalyst under the condition of the selective catalyst reduction of the gas fume. The method can effectively solve the problem of high NOx content in the gas fume and completely denitrates the gas fume in the true sense by supplementing the denitrating agent and disturbing the denitrating agent and the gas fume between a selective non catalyst reduction process of the gas fume and another selective catalyst reduction process of the gas fume.

Description

technical field [0001] The invention relates to a flue gas denitrification method. Background technique [0002] Flue gas is one of the main emissions of thermal power plants, which is produced by burning combustibles in burners (ie, boilers). Because flue gas usually contains a large amount of nitrogen oxides NO x Such as NO, if these nitrogen oxides are directly discharged into the atmosphere, they will cause highly corrosive acid rain, so the flue gas must be denitrified (ie, denitrified) before being discharged. [0003] At present, there are mainly two kinds of mature flue gas denitration technologies: selective catalytic reduction (SCR) process and selective non-catalytic reduction denitrification (SNCR) process. The SNCR process generally sprays a denitrification agent into the furnace of a boiler at 800-1300 °C, and contacts the denitrification agent (urea or ammonia) with the flue gas to make the denitrification agent and the NO in the flue gas x undergoes a sele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/79B01D53/56
Inventor 周国民唐建城李振忠王松峰赵海军
Owner CHINA SHENHUA ENERGY CO LTD
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