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Flue gas desulfurization and denitration integrated process

A technology for desulfurization, denitrification, and flue gas, which is applied in the fields of air quality improvement, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of high purchase cost and transportation cost, unfavorable resource recycling, and high waste water treatment costs. Low cost, easy operation and low risk

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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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
[0007] However, regardless of the oxidation process or the reduction process, reducing agents such as ammonia or liquid ammonia, or strong oxidants such as ozone or hydrogen peroxide are usually used in the prior art, which will cause many problems, such as high purchase costs and transportation costs; and These substances are extremely volatile and highly irritating, and there is a danger of explosion if improperly stored and transported

Method used

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  • Flue gas desulfurization and denitration integrated process

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Effect test

Embodiment 1

[0035] Taking a boiler (10t / h) as an example, the desulfurization and denitrification treatment is carried out according to the integration process of flue gas desulfurization and denitrification described in the present invention. The catalyst layer is composed of 1.2wt% V 2 o 5 , 1.0wt% Fe 2 o 3 It is composed of a sintered body formed by sintering the remaining active coke. The oxidation slurry is composed of 2.0wt% active coke, 0.8wt% ferric oxide, 0.9wt% copper oxide and the rest of water; the number of atomization devices is 6, and along the concentric circle Evenly arranged at intervals of 60 degrees; the absorption slurry is composed of 2.0wt% limestone, 1.0wt% active coke, 0.8wt% ferric oxide, 0.7wt% copper oxide and the rest of water; the oxidation slurry The ratio to flue gas is 3L / m 3 ; The ratio of the absorption slurry to the flue gas is 15L / m 3 ; In the high-speed absorption stage, the flue gas velocity is 10-25m / s; in the low-speed absorption stage, the f...

Embodiment 2

[0039] Taking a boiler (10t / h) as an example, the desulfurization and denitrification treatment is carried out according to the integration process of flue gas desulfurization and denitrification described in the present invention. The catalyst layer is composed of 1.8wt% V 2 o 5 , 1.2wt% Fe 2 o 3 It is composed of a sintered body formed by sintering the remaining active coke. The oxidation slurry is composed of 1.2wt% active coke, 1.2wt% ferric oxide, 1.2wt% copper oxide and the rest of water; the number of atomization devices is 6, and along the concentric circle Evenly arranged at intervals of 60 degrees; the absorption slurry is composed of 2.5wt% limestone, 1.5wt% active coke, 1.5wt% ferric oxide, 1.0wt% copper oxide and the rest of water; the oxidation slurry The ratio to flue gas is 3L / m 3 ; The ratio of the absorption slurry to the flue gas is 15L / m 3 ; In the high-speed absorption stage, the flue gas velocity is 10-25m / s; in the low-speed absorption stage, the f...

Embodiment 3

[0043] Taking a boiler (10t / h) as an example, the desulfurization and denitrification treatment is carried out according to the integration process of flue gas desulfurization and denitrification described in the present invention. The catalyst layer is composed of 0.8wt% V 2 o 5 , 0.7wt% Fe 2 o 3 It is composed of a sintered body formed by sintering the remaining active coke. The oxidation slurry is composed of 1.2wt% active coke, 0.5wt% ferric oxide, 0.8wt% copper oxide and the rest of water; the number of atomization devices is 6, and along the concentric circle Evenly arranged at intervals of 60 degrees; the absorption slurry is composed of 1.5wt% limestone, 1.5wt% active coke, 1.0wt% ferric oxide, 0.5wt% copper oxide and the rest of water; the oxidation slurry The ratio to flue gas is 5L / m 3 ; The ratio of the absorption slurry to the flue gas is 20L / m 3 ; In the high-speed absorption stage, the flue gas velocity is 10-25m / s; in the low-speed absorption stage, the f...

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Abstract

The invention relates to a flue gas desulfurization and denitration integrated process. An absorbent serous fluid containing limestone, activated coke, catalytic agents and water is used for absorbing and removing nitric oxide and sulfur dioxide in flue gases. The flue gas desulfurization and denitration integrated process has 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 invention relates to the technical field of flue gas separation and purification, in particular, the invention relates to a process for combined desulfurization and denitrification of flue gas by means of gas-liquid contact under the condition of high-temperature atomization. Background technique [0002] my country is a big country in the production and use of industrial boilers. At present, there are more than 500,000 industrial boilers in use in my country, with a large number and wide distribution, and more than 80% of them are coal-fired boilers. At present, my country's coal-fired industrial boilers have the following characteristics: (1) The average capacity of a single boiler is small, the overall level of energy consumption is high, the level of energy conservation and emission reduction management is low, energy waste and environmental pollution are serious; (2) The types of coal used by boilers are variable , Combustion methods are outdat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/75
CPCY02A50/20
Inventor 周琪
Owner 北京至清时光环保工程技术有限公司
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