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High-temperature atomization wet denitration process system and denitration method

A technology of wet denitrification and process system, which is applied in the field of process system for denitrification of flue gas or tail gas under the application of flue gas denitrification process of small and medium-sized boilers, and can solve the problems of unfavorable resource recycling, high cost of wastewater treatment, and oxidant Problems such as large amount of use, to achieve the effect of high purchase cost, low risk, and low use cost

Inactive Publication Date: 2012-11-14
北京至清时光环保工程技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Patent application CN1923341A discloses a coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitrification device and its method, but the amount of ozone injected into it is relatively large, and the molar ratio to nitric oxide is about 0.5-1.5, which affects the efficiency of the method. Economical, high-valence nitrogen oxide NO that is easily soluble in water after oxidation 2 , NO 3 or N 2 o 5 In the process of reacting with lye, a mixture of nitrate and nitrite will be generated, and the waste water after absorption will be expensive to treat, which is not conducive to the recycling of resources
[0008] Patent application CN101352644A discloses a method of denitrification using hydrogen peroxide or ozone oxidant, but the economical efficiency of the method is affected due to the large amount of oxidant used

Method used

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  • High-temperature atomization wet denitration process system and denitration method

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Experimental program
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Effect test

Embodiment 1

[0039] Taking a boiler (10t / h) as an example, the denitrification process is carried out according to the high-temperature atomization wet denitrification process system and the denitrification method of the present invention. In the experiment, the absorbent slurry includes 5wt% limestone, 2.5wt% active coke, and 0.5wt% ferric oxide catalyst; the ratio of absorbent slurry to flue gas is 15L / m 3 . In the first reaction step, the flue gas flow rate is 20-25m / s. In the second reaction step, the flue gas flow rate is 3-5m / s; the temperature of the high-temperature steam is preferably 350°C.

[0040] The basic data obtained from the test are as follows:

[0041] Total flue gas flow: 12000m 3 / h; flue gas containing NOx 600mg / m 3 . Net flue gas contains NOx 100-120mg / m 3 , the denitrification rate reaches 80-85%.

Embodiment 2

[0043] Taking a boiler (20t / h) as an example, the denitration treatment is carried out according to the high-temperature atomization wet denitration process system and the denitration method of the present invention. In the experiment, the absorbent slurry included 1.2wt% limestone, 3.5wt% active coke, and 1.0wt% ferric oxide catalyst; the ratio of absorbent slurry to flue gas was 15L / m 3 . In the first reaction step, the flue gas flow rate is 20-25m / s. In the second reaction step, the flue gas flow rate is 3-5m / s; the temperature of the high-temperature steam is preferably 350°C.

[0044] The basic data obtained from the test are as follows:

[0045] Total flue gas flow: 25000m 3 / h; flue gas containing NOx 800mg / m 3 . Net flue gas contains NOx 120-150mg / m 3 , The denitrification rate reaches more than 80%.

Embodiment 3

[0047] Taking a boiler (10t / h) as an example, the denitrification process is carried out according to the high-temperature atomization wet denitrification process system and the denitrification method of the present invention. In the experiment, the absorbent slurry includes 4.5wt% limestone, 2.5wt% active coke, 0.2wt% catalyst; the catalyst is Fe 2 o 3 、TiO 2-x and Cu 2 Composition composed of B, wherein X=0.5, and the content of each component is Fe 2 o 3 Accounting for 50wt%, TiO 2-x 25wt%, Cu 2 B accounts for 25 wt%.

[0048] The ratio of absorbent slurry to flue gas is 15L / m 3 . In the first reaction step, the flue gas flow rate is 20-25m / s. In the second reaction step, the flue gas flow rate is 3-5m / s; the temperature of the high-temperature steam is preferably 350°C.

[0049] The basic data obtained from the test are as follows:

[0050] Total flue gas flow: 25000m 3 / h; flue gas containing NOx 600mg / m 3 . Net flue gas contains NOx 80-100mg / m 3 , The deni...

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Abstract

The invention relates to a high-temperature atomization wet denitration process system and a denitration method. An absorbent serous fluid containing limestone, activated coke, catalytic agents and water is used for absorbing and removing nitric oxide in fuel gases to form calcium nitrate and release carbon dioxide gases. The high-temperature atomization wet denitration process system and the denitration method have the advantages of being small in investment, simple in operation and high in denitration efficiency; used absorbents are non-toxic, non-irritant, small in dangerousness, convenient to store and transport and low in using costs; and the process is particularly suitable for desulfurization and denitration of flue gases of small and medium-sized industrial boilers, live heating boilers and hot water supply boilers.

Description

technical field [0001] The present invention relates to the technical field of flue gas separation and purification, specifically, the present invention relates to a process system and denitrification method for flue gas or tail gas denitrification under the condition of high-temperature atomization by means of gas-liquid contact. The invention is particularly suitable for the application of the flue gas denitrification process of small and medium-sized boilers. Background technique [0002] my country is the world's largest coal producer and consumer, and one of the few countries in the world where coal is the main energy source. Therefore, my country's air pollution is dominated by bituminous coal, and the main pollutants are nitrogen oxides and soot. my country's current atmospheric environment is still not optimistic, and acid rain pollution is gradually increasing. According to statistics, in the south of the Yangtze River, east of the Qinghai-Tibet Plateau, and the S...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/86B01D53/56
Inventor 周琪
Owner 北京至清时光环保工程技术有限公司
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