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Method for simultaneously removing sulfur oxides and nitric oxides in flue gas

A technology of sulfur oxides and nitrogen oxides, which is applied in the field of flue gas purification, can solve the problems of large equipment investment, secondary pollution, and high cost, and achieve the effects of saving equipment investment, good desulfurization and denitrification, and reducing control costs

Active Publication Date: 2010-01-27
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more mature technologies for reducing nitrogen oxide emissions in flue gas include SCR (selective catalytic reduction) and SNCR (selective non-catalytic reduction), both of which use ammonia or urea to reduce nitrogen oxides in flue gas to The advantage of SCR is high denitrification efficiency, but the disadvantage is high cost, especially the cost of catalyst, which is difficult for users to accept, and has high requirements for operation and maintenance. The cost of SNCR is relatively low, but the denitrification efficiency It is also low, and has strict requirements on the temperature of the injection point. Both require the reducing agent to be mixed with the flue gas evenly, otherwise part of the reducing agent will escape and cause secondary pollution.
The above desulfurization and denitrification technologies implement separate control of sulfur dioxide and nitrogen oxides, and the equipment investment is relatively large

Method used

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  • Method for simultaneously removing sulfur oxides and nitric oxides in flue gas

Examples

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Effect test

Embodiment 1

[0036] Example 1: Using slaked lime (as absorbent, average particle size d 50 20μm, R 90 Less than 10%, the molar ratio of calcium, sulfur and nitrogen (Ca / (S+0.5N)) is 1.3, the flue gas temperature at the point of absorbent injection is 110°C, the temperature in the fluidized bed reactor is 80°C, and the temperature difference is 20°C above the dew point. The volume fraction of oxygen in the flue gas is 5%, the volume fraction of water vapor is 20%, NO is 400ppm, SO 2 It is 800ppm, the desulfurization efficiency is 85%, and the denitration efficiency is 60%.

Embodiment 2

[0037] Example 2: Using quicklime as the absorbent, the average particle size d of the absorbent 50 50μm, R 90 Less than 10%, calcium-sulfur-nitrogen molar ratio Ca / (S+0.5N) is 1.1, absorbent spray point flue gas temperature 150℃, oxygen volume fraction in flue gas 3%, water vapor volume fraction 20%, fluidized bed reaction The internal temperature of the device is 60℃, the temperature difference is 15℃ higher than the dew point, NO is 400ppm, SO 2 It is 800ppm, the desulfurization efficiency is 80%, and the denitration efficiency is 50%.

Embodiment 3

[0038] Example 3: Using quicklime as absorbent, average particle size d 50 20μm, R 90 Less than 10%, the molar ratio of calcium, sulfur and nitrogen (Ca / (S+0.5N)) is 2.5, the smoke temperature of absorbent injection point is 120℃, the volume fraction of oxygen in the smoke is 8%, and the volume fraction of water vapor is 30%, fluidized The temperature in the bed reactor is 70℃, the temperature difference is 15℃ higher than the dew point, NO is 400ppm, SO 2 It is 800ppm, the desulfurization efficiency is 95%, and the denitration efficiency is 75%.

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Abstract

The invention relates to a method for simultaneously removing sulfur oxides and nitric oxides in flue gas, which belongs to the technical field of flue gas purification. The method comprises the following steps: spraying water or steam into a flue before flue gas from burning equipment enters a fluidized bed reactor through the flue and controlling the temperature of the flue gas within a range of 90-200 DEG C, wherein the flue gas in the flue contains gas components of O2, H2O, SO2 and NOx; directly jetting CaO and / or Ca(OH)2 into the flue to oxidize NO; and controlling the temperature of the fluidized bed reactor to be between 50 DEG C and 90 DEG C for the flue gas to desulfurize and denitrate in the fluidized bed reactor. In the method, desulfurization and denitration can be simultaneously realized in the same system by adjusting processing steps and controlling a reaction condition. When a molar ratio Ca / (S+0.5N) of calcium to sulfur to nitrogen is 1.3, the removal rate of the SO2 can reach over 85 percent, and the removal rate of the NO can reach over 60 percent.

Description

Technical field [0001] The invention relates to a desulfurization and denitration method for fossil fuel combustion flue gas, and belongs to the technical field of flue gas purification. Background technique [0002] Today, due to the large-scale use of fossil fuels, there are more than 20 million tons of sulfur oxides (with SO 2 Mainly) and more than 10 million tons of nitrogen oxides (mainly NO) are discharged into the atmosphere, causing serious acid rain pollution in my country. At present, large-scale commercial applications have been carried out to control sulfur dioxide emissions, including limestone-gypsum method and semi-flue gas desulfurization technology (spray drying method and flue gas circulating fluidized bed method). They are characterized by high desulfurization efficiency, but Unable to denitrify. Especially for semi-dry flue gas desulfurization technology, when CaO or Ca(OH) is used 2 As an absorbent, although the finer the absorbent particles, the higher the ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60
CPCY02A50/20
Inventor 佟会玲禚玉群祁海鹰李鹏飞张虎陈昌和徐旭常
Owner TSINGHUA UNIV
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