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Alkali liquor method for flue gas desulfurization

A technology of lye and flue gas, which is applied in the field of environmental engineering, can solve the problems of high price and increased operating cost, and achieve the effect of reducing consumption, reducing treatment cost and ensuring desulfurization rate

Inactive Publication Date: 2011-09-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the desulfurizer used is mainly alkali metal carbonate or alkali metal hydroxide, the price is relatively expensive; at the same time, although the desulfurizer can be regenerated through the reaction with the lime emulsion, loss will inevitably occur, so it must Fresh desulfurizer is often added to the desulfurization tower, resulting in an increase in operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The residual ammonia water of a coking plant was used to replace 20% of the start-up base. The ammonia nitrogen content in the residual ammonia water used in the test was 3200 mg / L, and the amount of additive A added was 0.3 mg / L; the SO in the test flue gas 2 The average concentration is 2000mg / m 3 ; The average flow rate of flue gas is 600L / min; the average temperature of flue gas at the system inlet is 60°C; the remaining ammonia water and starting alkali are added to the desulfurization tower respectively. Among them, NaOH is used as the starting base, the concentration is 0.4mol / L, and the liquid-gas ratio is 2L / m 3 ; SO in the treated flue gas 2 The concentration is 100mg / m 3 , the desulfurization rate reaches 95.0%. The system can run continuously and stably, and the material circulation in the system is smooth.

Embodiment 2

[0016] Replace 50% of the start-up alkali with the residual ammonia water of a coking plant. The ammonia nitrogen content in the residual ammonia water used in the test is 3200 mg / L, and the addition amount of additive A is 0.3 mg / L; the SO in the test flue gas 2 The average concentration is 2000mg / m 3 ; The average flue gas flow rate is 600L / min; the average temperature of the flue gas at the system inlet is 60°C; the remaining ammonia water and starting alkali are respectively added to the desulfurization tower, and the starting alkali is NaOH, the concentration is 0.4mol / L, and the liquid-gas ratio is 2L / m 3 ; SO in the treated flue gas 2 The concentration is 72mg / m 3 , the desulfurization rate reached 96.4%. The system can run continuously and stably, and the material circulation in the system is smooth.

Embodiment 3

[0018] Replace 80% of the start-up alkali with the residual ammonia water of a coking plant. The ammonia nitrogen content in the residual ammonia water used in the test is 3200mg / L, and the addition amount of additive A is 0.3mg / L; the SO in the test flue gas 2 The average concentration is 2000mg / m 3 ; The average flue gas flow rate is 600L / min; the average temperature of the flue gas at the system inlet is 60°C; the remaining ammonia water and starting alkali are respectively added to the desulfurization tower, and the starting alkali is NaOH, the concentration is 0.4mol / L, and the liquid-gas ratio is 2L / m 3 ; SO in the treated flue gas 2 The concentration is 106mg / m 3 , the desulfurization rate reached 94.70%. The system can run continuously and stably, and the material circulation in the system is smooth.

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Abstract

The invention belongs to the field of environmental engineering, and relates to an alkali liquor method for flue gas desulfurization. According to the method, residual ammonia water is utilized to replace part of a desulfurizer in a system for flue gas desulfurization by alkali liquor method, wherein an ammonia nitrogen content of the residual ammonia water is larger than 100mg / L, and a usage amount of the residual ammonia water is 20-80% of that of the desulfurizer. Meanwhile, a certain amount of an additive A can be added into the residual ammonia water, so that effective ammonia in the residual ammonia water, as a good alkaline absorbent, absorbs SO2 in flue gas, and the additive A can prolong the service life of cyclic alkali liquor, increase a desulfuration efficiency and enhance gypsum quality. The advantages of the invention are that the alkali liquor method for flue gas desulfurization is an efficient method that treats waste with waste and combines organics and inorganics, and valuable components in industrial waste are utilized comprehensively to realize treatment of waste with waste.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a flue gas desulfurization method by an alkali solution method. Background technique [0002] According to the State Environmental Protection Administration's "2008 China Environmental Status Bulletin", in 2008 SO 2 The emissions are 23.212 million tons, of which industrial SO 2 The emission is about 19.913 million tons. Studies by Chinese Academy of Environmental Sciences, Tsinghua University and other units have shown that due to SO 2 The acid rain pollution caused by pollution, etc. causes losses of more than 110 billion yuan to my country every year. Reducing sulfur dioxide emissions has become the focus of environmental protection during the country's "Eleventh Five-Year Plan" period. The Ministry of Environmental Protection's "Twelfth Five-Year Plan" has been initially drafted. [0003] In the wet flue gas desulfurization process, the dual-alkali flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/79B01D53/50
Inventor 宋存义童震松常冠钦汪莉邢奕钱大益薛航杨自华张志鸿王路敏
Owner UNIV OF SCI & TECH BEIJING