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Method of liquid column spray tower desulfurization with salt cement

A technology of salt cement and injection tower, which is applied in the field of flue gas desulfurization, can solve the problems of inability to use salt cement, blockage, inconvenient desulfurization, etc., and achieve the effects of reducing desulfurization operation costs, expanding the application range, and reducing treatment costs

Inactive Publication Date: 2004-12-15
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] (1) Due to the need to mix salt cement and seawater at a ratio of 1:1.5 to 2.5 for desulfurization, the use of salt cement is limited, and salt cement cannot be used for desulfurization in power plants that are inconvenient to use seawater for desulfurization
[0006] (2) If the liquid-gas ratio is controlled at 1.0-1.8 liters / cubic meter in the reaction process, and a desulfurization efficiency of more than 75% is desired, the desulfurization equipment that can be selected can only be a spray tower. However, due to the large amount of desulfurization in salt cement In the presence of solids, the nozzle is easy to wear and block, making it difficult for industrial application
[0007] (3) The desulfurization liquid is not recycled, it is discharged directly after the reaction, the utilization rate of salt cement is low, and, under the operating condition of high pH value, scabs are easily generated in the desulfurization tower, which affects the long-term stable operation of the desulfurization equipment
[0008] (4) Salt cement and seawater are mixed at a ratio of 1: (1.5-2.5) for desulfurization, which increases the volume of desulfurization by-products and increases the cost of desulfurization by-products.

Method used

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  • Method of liquid column spray tower desulfurization with salt cement

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Embodiment 1

[0016] The best embodiment of the present invention is implemented in the captive thermal power plant of the soda ash plant. Under normal operating conditions, after the boiler flue gas is dedusted by the electrostatic precipitator, it is passed into the liquid column injection desulfurization tower. The amount of cement mixed liquid entering the desulfurization tower is controlled according to the liquid-gas ratio of 10-20 liters / cubic meter. Use the desulfurization reaction and the supplement of salt cement to control the pH of the circulating slurry to 7-9. Part of the desulfurization circulating liquid is separated by the cyclone separator and then enters the filter press system, and the waste residue is discharged after press filter. The flue gas is discharged after desulfurization, and the desulfurization efficiency is greater than 95%.

[0017] The clear liquid separated by the cyclone separator and the clear liquid filtered by the filter press system have a pH of 7~9...

Embodiment 2

[0020] The boiler is near the salt cement discharge point, and the salt cement slurry is transported to the on-site storage device of the desulfurization device by pipeline. The boiler flue gas is passed into the liquid column injection desulfurization tower, and the sulfur dioxide concentration of the flue gas at the inlet of the liquid column injection desulfurization tower is 1500-2000 mg / m3 , the salt cement is directly replenished into the liquid inlet pipeline of the desulfurization tower, and the liquid replenishment amount of the salt cement is controlled so that the pH value of the mixed liquid injected into the desulfurization tower by the liquid inlet column is between 5 and 7, and the liquid amount of the salt cement mixed liquid entering the desulfurization tower is based on the liquid-gas ratio of 20~ 30 liters per cubic meter, the pH value of the desulfurized slurry is controlled at 4-5, and the desulfurized slurry is used to neutralize the alkaline distillation w...

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Abstract

The method of using salt cement in desulfurizing in liquid column spraying tower includes the following steps: leading fume into liquid column spraying desulfurizing tower while feeding the mixed slurry of salt cement and circulating slurry into the liquid column spraying desulfurizing tower for mixing to desulfurizing; and exhausting the desulfurized fume while circulating partial slurry and exhausting the other. The mixed slurry in the desulfurizing tower has pH 5-9, and the liquid / gas ratio inside the tower is 1-3 vol%. Compared with available technology, the present invention has the advantages of low investment in desulfurizing apparatus, low desulfurizing cost, expanded application range of salt cement, etc.

Description

technical field [0001] The present invention relates to a method for flue gas desulfurization, more specifically, the present invention relates to a method for desulfurizing flue gas by using waste sludge produced in the brine refining process as a desulfurizing agent. Background technique [0002] At present, the most widely used desulfurization method in large and medium-sized power plants is the limestone-gypsum method. [0003] The limestone-gypsum method is a relatively mature technology used in the world. Its system is huge, and it needs to be equipped with a limestone pulverizing system and a desulfurization by-product treatment system. The one-time investment is high, generally 400-1000 yuan / kwh. Accounting for about 12% to 18% of coal-fired power plants, a large amount of limestone and water are required for operation, and the operating cost is relatively high, excluding depreciation, the operating cost is 0.6-1.0 yuan / kg sulfur dioxide. [000...

Claims

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Application Information

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IPC IPC(8): B01D53/48B01D53/80
Inventor 鲁泳常宗臣张祥冬常红林庞栓林王春凡廖新华张允文
Owner TIANJIN BOHUA YONGLI CHEM IND
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