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Method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas

A technology for coal-fired flue gas and denitrification, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of high energy consumption, large one-time investment, and high operating costs in the decarbonization method, and solve the problem of fertilizer production. , The effect of high removal rate and small investment

Inactive Publication Date: 2010-09-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of desulfurization and denitrification methods, such as large initial investment, high operating costs, and huge energy consumption in decarbonization methods, the present invention proposes a purification method for simultaneous desulfurization, denitrification and decarburization of coal-fired flue gas, which is realized through the following technical solutions , in order to achieve the purpose of low cost and high efficiency:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A. will contain SO 2 , NO and CO 2 The coal-fired flue gas is used for bag dust removal;

[0021] B. Reduce the temperature of the flue gas dedusted in the above step A to 90°C, and pass the flue gas into the X-type molecular sieve equipped with potassium, calcium, and copper adsorbents. The adsorption temperature is 70°C, and the adsorption pressure is gradually increased from 50Pa. Adsorption is carried out during the process of increasing to 10000Pa, that is, when the adsorption pressure is 50-200Pa, nitrogen oxide is firstly adsorbed, sulfur dioxide is adsorbed when the adsorption pressure is 100-500Pa, and carbon dioxide is adsorbed when the adsorption pressure is 5000-10000Pa until the adsorption is saturated ;

[0022] C. The flue gas tail gas after adsorption saturation in step B is directly discharged into the atmosphere, and the saturated adsorbent is decompressed and desorbed as usual to make the adsorbed SO 2 , NO and CO 2 The mixed gas is desorbed, and ...

Embodiment 2

[0027] A. will contain SO 2 , NO, NO 2 and CO 2 The coal-fired flue gas is subjected to electric dust removal;

[0028] B. Reduce the temperature of the flue gas dedusted in step A to 10°C, and pass the flue gas into the ZSM-5 molecular sieve equipped with sodium, magnesium, and lanthanum adsorbents. The adsorption temperature is 100°C, and the adsorption pressure is 50Pa. Adsorption is carried out in the process of gradually increasing to 10000Pa, that is, when the adsorption pressure is 50-200Pa, nitrogen oxide is first adsorbed, sulfur dioxide is adsorbed when the adsorption pressure is 100-500Pa, carbon dioxide is adsorbed when the adsorption pressure is 5000-10000Pa, until the adsorption saturation;

[0029] C. The flue gas tail gas after adsorption saturation in step B is directly discharged into the atmosphere, and the saturated adsorbent is heated and desorbed as usual to make the adsorbed SO 2 , NO, NO 2 and CO 2 The mixed gas is desorbed, and the desorbed adsor...

Embodiment 3

[0034] A. will contain SO 2 , NO, NO 2 and CO 2 The coal-fired flue gas is subjected to electric dust removal;

[0035] B. The temperature of the flue gas dedusted in step A is lowered to 60°C, and the flue gas is passed into the heulandite molecular sieve equipped with barium adsorbent. The adsorption temperature is 50°C, and the adsorption pressure is gradually increased from 50Pa to 10000Pa. Adsorption is carried out in the medium, that is, when the adsorption pressure is 50-200Pa, nitrogen oxide is firstly adsorbed, sulfur dioxide is adsorbed when the adsorption pressure is 100-500Pa, and carbon dioxide is adsorbed when the adsorption pressure is 5000-10000Pa until the adsorption is saturated;

[0036] C. The flue gas tail gas after adsorption saturation in step B is directly discharged into the atmosphere, and the saturated adsorbent is decompressed and desorbed as usual to make the adsorbed SO 2 , NO, NO 2 and CO 2 The mixed gas is desorbed, and the desorbed adsorbe...

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Abstract

The invention provides a method for simultaneously desulfurating, denitrating and decarbonizing coal-fired flue gas. The method comprises the following steps: dedusting and cooling the coal-fired flue gas containing SO2, NOx and CO2; leading the gas into an adsorbent for saturated adsorption at the adsorption temperature of 50-100 DEG C and the adsorption pressure of 50-10000Pa; evacuating the coal-fired flue gas, desorbing the adsorbent by means of pressure reduction or temperature rise, and then repeatedly using; leading the desorbed gas into ammonia water for absorption treatment, wherein, the mass ratio of the ammonia water to the mixed gas containing SO2, NOx and CO2 is 2-6:1, the absorption temperature is 30-50 DEG C, and the absorption pressure is 5000-12000Pa; and recycling the gas to generate ammonium sulfate, ammonium nitrate and ammonium carbonate. The method can achieve simultaneouse desulfuration, denitration and decarbonization, and has small investment, low cost and low energy consumption; and the method can be widely applied to purification treatment of SO2, NOx and CO2 in the waste gas discharged from fixed fire coal sources such as thermal power plants, smelting plants, oil refinery, chemical plants and the like.

Description

technical field [0001] The invention relates to a method for simultaneous desulfurization, denitrification and decarbonization of coal-fired flue gas, belonging to the technical field of air pollution purification. Background technique [0002] by SO 2 and NO X Acid rain caused by acid-causing substances and CO 2 The greenhouse effect caused by greenhouse gases such as greenhouse gases is a global atmospheric environmental problem that is widely concerned in the world. 70% of carbon dioxide emissions, 90% of sulfur dioxide emissions and 67% of nitrogen oxide emissions in the air come from the use of fossil fuels. In view of the fact that coal is the main primary energy consumption in my country, the control of coal-fired flue gas emissions has become the key to protecting the atmospheric environment. [0003] At present, the methods for simultaneous desulfurization and denitrification of flue gas include liquid phase absorption method, electron beam irradiation method, e...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60B01D53/62
CPCY02A50/20
Inventor 易红宏邓华唐晓龙宁平余琼粉杨丽萍
Owner KUNMING UNIV OF SCI & TECH
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