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Wet flue gas desulfurization and denitrification combined method

A flue gas and denitrification technology, applied in separation methods, chemical instruments and methods, and air quality improvement, can solve the problems of high operating costs and large initial investment, and achieve the effects of reducing operating costs, reducing investment and increasing costs.

Active Publication Date: 2013-03-13
GUODIAN SCI & TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial investment of this process system is large, and the operating cost is high

Method used

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  • Wet flue gas desulfurization and denitrification combined method
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  • Wet flue gas desulfurization and denitrification combined method

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Effect test

Embodiment 1

[0029]The combined wet flue gas desulfurization and denitrification device implementing the method of the present invention is operated in a 3×25MW unit of a self-provided power plant in Jiangsu, and the relevant parameters are listed in Table 1.

[0030] Table 1

[0031]

[0032]

Embodiment 2

[0034] The combined wet flue gas desulfurization and denitrification device implementing the method of the present invention is operated in a 2×300MW unit of a power generation company in Northwest China, and the relevant parameters are listed in Table 2.

[0035] Table 2

[0036]

[0037]

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PUM

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Abstract

The invention relates to a wet flue gas desulfurization and denitrification combined method. In an absorption tower, a desulfurizing agent, namely lime stone slurry reacts with SO2 in flue gas in a spraying mode, oxidizing air is input to oxidize CaSO3 in tower bottom slurry into CaSO4, and a part of tower bottom slurry is extracted and returns to the tower to be sprayed; a denitrification oxidizing agent, namely potassium permanganate, hydrogen peroxide or sodium hypochlorite and an inhibitor, namely cerium oxide or vanadium pentoxide are introduced into the original flue and introduced intothe absorption tower with the flue gas, and a denitrification reducing agent, namely urea or diammonium hydrogen phosphate and a stabilizer, namely ethylenediamine or ammonium phosphate are added into the absorption tower in the spraying mode; and the weight ratio of the denitrification oxidizing agent to the inhibitor is 1:(0.01-0.1), and the weight ratio of the denitrification reducing agent tothe stabilizer is 1:(0.0001-0.001). By the method, the problem that denitrification and desulfurization restricts each other is well solved, the flue gas is efficiently subjected to denitrification and desulfurization in the same device simultaneously to reach the discharge standard, and sulfur dioxide and nitrogen oxide are prevented from polluting an environment.

Description

technical field [0001] The patent of the present invention relates to a combined wet flue gas desulfurization and denitrification method, which belongs to the field of coal-fired flue gas purification. Background technique [0002] my country is the largest coal consumption country in the world, more than 60% of which is consumed by thermal power plants and large and medium-sized coal-fired boilers, and the sulfur dioxide (SO 2 ), nitrogen oxides (NOx) are one of the main sources of air pollution in my country, among which power plants and industrial boilers and kilns account for about 70% of the total emissions. In recent years, with the rapid development of my country's national economy, the emission pollution of flue gas has shown a continuous growth trend. Therefore, the control of SO in coal-fired flue gas 2 and NO x Emissions are an important part of protecting the atmospheric environment. [0003] Coal-fired SO 2 , NO X Pollutant control is the focus and difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/78B01D53/60B01D53/96F23J15/04
CPCY02A50/20
Inventor 李忠华王小明薛建明柏源
Owner GUODIAN SCI & TECH RES INST
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