Method for simultaneously desulfurizing, denitrating and purifying flue gas

A technology for desulfurization, denitrification, and smoke flue gas, which is applied in the field of flue gas purification, can solve problems such as poor desulfurization and denitrification effects, harsh reaction conditions, complex process technology, etc., and achieve low operation and maintenance costs, strong flue gas adaptability, and wide application Effect

Inactive Publication Date: 2014-06-18
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have the disadvantages of complex process technology, harsh reaction conditions, poor desulfurization and denitrification effects, and high operating costs.
In particular, the selective catalyst reduction denitrification technology (SCR) or non-catalytic reduction denitrification technology (SNCR) is widely used in my country at present for denitrification, and then the limestone-gypsum method is used for desulfurization process. This method has high investment costs and high operating costs. At the same time, a large amount of by-product desulfurization gypsum is produced, and the post-processing is more difficult

Method used

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  • Method for simultaneously desulfurizing, denitrating and purifying flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The flue gas containing sulfur and nitric acid at 1100°C is absorbed by ammonia and desulfurized flue gas is exchanged in the flue gas heat exchanger 1 and cooled to 90°C, then enters the ammonia absorption tower 2, and is sprayed by the upper part of the spray scrubber 3. The ammonium sulfate solution added with ammonia water is contacted, and the dust in the flue gas is washed away by spray washing. During this process, the flue gas is cooled due to adiabatic evaporation, and the SO in the flue gas 2 It is absorbed by the absorption liquid sent by the absorption liquid circulation pump 5. The absorption liquid falls into the aeration oxidizer 4 through the return pipe, and the air is aerated by the blower pump 6 to oxidize the nitrite (ammonium sulfite and ammonium bisulfite) solution into ammonium sulfate solution, and the absorption liquid circulation pump 5 After pressurization, it is sent to the spray washer 3 spray device, and the spraying and absorption are cont...

Embodiment 2

[0034] The flue gas containing sulfur and nitric acid at 200°C is absorbed by ammonia and the desulfurized flue gas is heat-exchanged in the flue gas heat exchanger 1 and cooled to 50°C, then enters the ammonia absorption tower 2, and is sprayed by the upper part of the spray absorber 3 The ammonia solution is sprayed and washed to wash away the dust in the flue gas and perform desulfurization. The desulfurized solution is aerated and oxidized by air in the aeration oxidizer 4 to generate ammonium sulfate solution, and then the ammonium sulfate fertilizer is produced after settling, filtering and concentrating tank 8; the desulfurized flue gas is heated to 120°C through the flue gas heat exchanger 1 , according to NO in flue gasX Spray a small amount of ammonia water into the pipeline to control the NH in the flue gas 3 / NOx molar ratio is 0.8, enters the lower part of activated carbon absorption tower 9, and the flue gas passes through adding CuO and V 2 o 5 The activated c...

Embodiment 3

[0037] A certain mercury-containing metallurgical flue gas at 900°C is absorbed by ammonia, then the desulfurized flue gas is exchanged in the flue gas heat exchanger 1 and cooled to 75°C, then enters the ammonia absorption tower 2, and is sprayed by the upper part of the spray scrubber 3. The ammonium sulfate solution with ammonia water is contacted, and the dust in the flue gas is washed away by spray washing. During this process, the flue gas is cooled due to adiabatic evaporation, and the SO in the flue gas 2 It is absorbed by the absorption liquid sent by the absorption liquid circulation pump 5. The absorption liquid falls into the aeration oxidizer 4 through the return pipe, and the air is aerated by the blower pump 6 to oxidize the nitrite (ammonium sulfite and ammonium bisulfite) solution into ammonium sulfate solution, and the absorption liquid circulation pump 5 After pressurization, it is sent to the spray device of the spray scrubber 3, and the spraying and absorp...

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Abstract

The invention discloses a method for simultaneously desulfurizing, denitrating and purifying flue gas and belongs to the field of flue gas purification. The method comprises the following steps: spraying the flue gas at the temperature of 50-90 DEG C by using ammonia absorption liquid to obtain a solution, and aerating and oxidizing the solution to obtain an ammonium sulfate solution; exchanging heat between the obtained flue gas and the original flue gas, heating to 120-350 DEG C, and supplementing ammonium hydroxide; converting NO and NO2 in the flue gas into N2 by addition or non-addition of an activated carbon material of a catalyst; performing reaction on the remaining SO2, ammonia and water vapor to generate ammonium sulfate; adsorbing mercury, dioxin, furan, a volatile organic compound, ammonia sol and other trace toxic substances by activated carbon; and regenerating the activated carbon after absorption and adsorption by using washing and heating methods. The method has the advantages that the process is simple and convenient, and the desulfurizing and denitrating efficiency is high; various toxic substances and fine particles in the flue gas can be adsorbed, a good prevention effect on PM2.5 pollution of industrial flue gas is achieved, ammonium sulfate and ammonium nitrate fertilizer byproducts are obtained, and resources can be recycled. The method can be applied to purification of sulfur-containing and nitrate-containing flue gas in the fields of boilers, metallurgy, chemical industry, thermoelectricity and garbage incineration power generation.

Description

Technical field: [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a method for simultaneously desulfurizing and denitrating flue gas. Background technique: [0002] With the increasing environmental pollution, the country has included air pollution control as a key prevention and control target, especially the indicators of sulfur and nitrogen oxides are the top priority in air pollution control. If two sets of devices are used to desulfurize and denitrify separately, not only the area will be large, but also the investment, management and operation costs will be high. In recent years, all countries in the world, especially industrially developed countries, have successively carried out research and development of simultaneous desulfurization and denitrification technologies. Simultaneous flue gas desulfurization and denitrification purification treatment technology has become a research and development hotspot in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/78B01D53/90B01D53/60B01D53/96C01C1/245C01C1/18
CPCY02A50/20Y02P20/151
Inventor 曾子平刘成周锡飞
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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