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Integrated device and technology for liquid phase flue gas desulfurization and denitration method

A technology of desulfurization and denitrification and liquid phase method, which is applied in the field of integrated device for simultaneous desulfurization and denitrification of flue gas by liquid phase method, can solve the problems of difficult removal of nitrogen oxides, high temperature denitrification energy consumption, etc., and achieve the improvement of absorption reaction rate and no Effects of secondary pollution and improvement of dispersibility

Inactive Publication Date: 2020-02-28
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially focus on solving the problem that nitrogen oxides containing 95% nitric oxide in flue gas are difficult to remove
Solve the problem of using two separate sets of equipment for desulfurization and denitrification respectively in the existing industry, as well as the problem of high temperature denitrification and high energy consumption, and at the same time improve the removal efficiency of desulfurization and denitrification, reduce the cost of removal, and reduce the occupied area and equipment investment, reducing operating costs

Method used

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  • Integrated device and technology for liquid phase flue gas desulfurization and denitration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] in such as figure 1 In the above-mentioned amplified integrated device system shown above, four porous sieve plates (8) and one gas distribution plate (11) are arranged in the absorption tower, the flow rate of the absorption liquid circulation pump (21) is 10m3 / h, and the flow rate of the induced draft fan is Fully open; sodium chlorite / sodium carbonate is used as absorbent, the total concentration is 0.15mol / L, that is, 36kg of 80% sodium chlorite and 9kg of sodium carbonate are added. Operate in an environment of 8-15 degrees Celsius and normal pressure. The measured flue gas concentration before treatment is: sulfur dioxide content is 415ppm, nitrogen monoxide content is 1419ppm, and nitrogen dioxide is 71ppm; after treatment, the content of flue gas is: sulfur dioxide 6ppm, nitrogen monoxide 50ppm, nitrogen dioxide 3ppm, remove The rates are respectively 98.6% for sulfur dioxide and 96.4% for nitrogen oxides.

Embodiment 2

[0045] in such as figure 1 In the system of the amplifying integrated device shown above, four porous sieve plates (8) and one gas distribution plate (11) are installed inside, and the flow rate of the absorption liquid circulation pump (21) is 13m 3 / h, the flow rate of the induced draft fan is three-quarters of the opening; 0.075mol / L sodium hypochlorite and 0.075mol / L potassium permanganate were added respectively, that is, 70kg of 10% sodium hypochlorite, 31.5kg of potassium permanganate, and hydrogen were added Sodium oxide 2kg. The measured concentrations before absorption are: sulfur dioxide 451ppm, nitrogen monoxide 1488ppm, nitrogen dioxide 74ppm; the concentrations of sulfur dioxide and nitrogen oxides in the flue gas at the outlet are: sulfur dioxide 10ppm, nitrogen monoxide 24ppm, nitrogen dioxide 2ppm; The removal rates of sulfur dioxide and nitrogen oxides were 97.8% and 98.3%, respectively.

Embodiment 3

[0047] in such as figure 1 In the system of the enlarged absorption device shown, six porous sieve plates (8) are arranged in the absorption tower, and a gas distribution plate (11) is installed at the bottom of the tower; absorb 20 kg of 80% sodium chlorite and 50 kg of 27.5% sodium hypochlorite agent, sodium hydroxide 4kg, the total concentration is 0.096mol / L, the flow rate of the absorption liquid circulation pump (21) is 8m3 / h, and the flow rate of the induced draft fan is opened for three-quarters; the concentration before the absorption is measured as: sulfur dioxide 402ppm, one Nitrogen oxide 1375ppm, nitrogen dioxide 69ppm; the concentrations of sulfur dioxide and nitrogen oxides in the flue gas at the outlet are: sulfur dioxide 0ppm, nitrogen monoxide 59ppm, nitrogen dioxide 3ppm; calculated sulfur dioxide removal rate of 100%, nitrogen oxides The total removal rate is 95.7%.

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Abstract

The invention discloses an integrated device and technology for a liquid phase flue gas desulfurization and denitration method, and belongs to the technical field of flue gas desulfurization and denitration. According to the method, a multi-component water solution is adopted to chemically absorb coal-fired flue gas of a boiler. The chemical reactions are carried out in the integrated device, which is composed of an absorption tower and an out-of-tower circulation liquid separation tank. At the same time, oxynitride and sulfur oxides of flue gas can be efficiently removed, and the desulfurization rate and denitration rate can both reach 95% or more. A reaction module made of a plurality of porous sieve plates, which are serially connected, is taken as the body of the absorption tower; fluegas enters the absorption tower from the bottom of the absorption tower, an absorption solution slows down from the top of the absorption tower to an inclined plate in the bottom of the absorption tower and then enters the circulation liquid separation tank, and the obtained clarified solution can be used in cycle. The integrated device can efficiently remove sulfur, nitrate, and dust, is installed behind a boiler, and has the advantages of simple structure, low manufacturing cost, convenience, small occupied area, and low operation cost.

Description

technical field [0001] The invention relates to the technical field of simultaneous desulfurization and denitrification of flue gas, in particular to an integrated device and process for simultaneous desulfurization and denitrification of flue gas by liquid phase method. Background technique [0002] Although my country's air pollution problem has been effectively controlled, it is still serious compared with developed countries, especially in the northern regions where heating in winter still consumes a large amount of coal and is widely dispersed. In order to protect the health of the human body and the ecological environment, the country has adopted stricter environmental protection policies, and the smoke emission standards have been continuously improved. However, coal is still the main energy source and industrial raw material on which my country's industry and people's livelihood depend. Its output is the sum of the output of the United States, Europe, and Russia. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78B01D45/02
CPCB01D45/02B01D53/60B01D53/78B01D2251/304B01D2251/306B01D2257/302B01D2257/402B01D2257/404B01D2258/0283Y02C20/10
Inventor 王承学杨昌霖王海博
Owner CHANGCHUN UNIV OF TECH
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