Control method for aerosol in flue gas desulfurization by utilizing ammonia method and master desulfurizing tower

A control method and aerosol technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve problems such as aerosol particles that cannot condense and grow in a supersaturated water vapor environment, and solve the problem of aerosol emissions , The effect of simple process

Inactive Publication Date: 2011-04-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the existing ammonia desulfurization operating conditions, no matter in the pre-washing tower (or water mist spray cooling device) or the desulfurization main tower, the supersaturated water vapor environment required for the condensation and growth of aerosol particles cannot be achieved; desulfurization The selection of operating conditions also mainly focuses on improving the desulfurization efficiency, and does not involve reducing the formation of aerosols

Method used

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  • Control method for aerosol in flue gas desulfurization by utilizing ammonia method and master desulfurizing tower
  • Control method for aerosol in flue gas desulfurization by utilizing ammonia method and master desulfurizing tower
  • Control method for aerosol in flue gas desulfurization by utilizing ammonia method and master desulfurizing tower

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Embodiment 1

[0023] According to the present invention, a method for controlling aerosols in ammonia-based flue gas desulfurization is as follows: figure 2 As shown; the high-temperature coal-fired flue gas enters the pre-washing tower 1, and after contacting the pre-washing liquid sprayed from the pre-washing liquid nozzle 2 countercurrently from bottom to top, the temperature of the flue gas drops from 100 to 200 ° C to a temperature near the saturated dew point of 60 ~ 80°C, and then go through the pre-washing tower mist eliminator 3 to remove the water mist and then enter the desulfurization washing area B in the desulfurization main tower 4, and contact with the desulfurization liquid sprayed from the desulfurization liquid nozzle 5 countercurrently, the SO in the flue gas 2 It is mainly absorbed here; the temperature of the imported desulfurization liquid is controlled at 30~50°C, which is 20~30°C lower than the temperature of the imported flue gas, and the operating liquid-gas ratio...

Embodiment 2

[0025] like image 3 As shown, the difference from Example 1 is that the flue gas enters the desulfurization washing zone B of the desulfurization main tower 4 after being sprayed and cooled by high-pressure water mist to a temperature close to the saturated dew point, and the rest is the same as that of Example 1.

Embodiment 3

[0027] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 150Nm 3 / h, the diameter of the desulfurization main tower is 150mm, the tower height is 2500mm, built-in four-stage spraying, the demister of the flue gas inlet in the condensation growth area is a plate corrugated demister, and the demister of the flue gas outlet is a wire mesh demister. The dust-laden flue gas produced by the coal-fired boiler enters the cooling device after the coarse particles are removed by the cyclone dust collector, and sprays high-pressure water mist with an average particle size of about 30mm. Then enter the desulfurization washing area and contact with the desulfurization liquid countercurrently. The temperature of the imported desulfurization liquid is controlled at about 31°C, and the operating liquid-gas ratio is 10L / Nm 3 , the desulfurization absorbent is ammonia water, which is added to the desulfurization oxidation zone from the bottom of the desul...

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Abstract

The invention discloses a control method for aerosol in flue gas desulfurization by utilizing an ammonia method and a master desulfurizing tower, and the control method is characterized in that flue gas enters the master desulfurizing tower after being cooled to the relative humidity of 90 to 100% and the temperature of 60 to 80 DEG C through high-pressure waster mist or prewashing temperature reduction; the generation of the aerosol particles in the desulfurization by utilizing the ammonia method is reduced by optimizing desulfurization operating conditions, and the formed aerosol particles are condensed to grow big and are partially washed to be eliminated through a desulfurizing solution; an appropriate amount of steam is injected into the saturated flue gas through desulfurizing and eliminating the partial aerosol particles; the oversaturated water vapor environment required by the secondary condensation and the growth of the aerosol particles is established on the top of the master desulfurizing tower; and the condensed and the grown aerosol particles are eliminated through a high-efficiency demister. The invention combines the formation mechanism of the aerosol in the flue gas desulfurization by utilizing the ammonia method; and the formation of the aerosol is reduced by optimizing the process conditions of the desulfurization operation and the elimination of the formed aerosol is promoted by utilizing a steam phase change principle at the same time so that the exhaust problem of the aerosol in the flue gas desulfurization by utilizing the ammonia method can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of fine particle control in coal-fired flue gas, and in particular relates to a method for controlling aerosol in ammonia-based flue gas desulfurization. Background technique [0002] With the continuous development of the synthetic ammonia industry and the continuous improvement and improvement of the wet ammonia flue gas desulfurization process, in recent years, the ammonia flue gas desulfurization process has a fast gas-liquid or gas-gas reaction speed, high utilization rate of absorbent, The advantages of high desulfurization efficiency and recyclable desulfurization by-products have been gradually promoted in coal-fired power plants. However, a large number of aerosol particles are likely to be produced during the desulfurization process. These aerosol particles will affect the normal operation of the equipment and will be discharged into the atmosphere with the flue gas, causing serious harm to the env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 杨林军鲍静静颜金培
Owner SOUTHEAST UNIV
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