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Additive Enhanced Coal Slurry Flue Gas Desulfurization Process

A desulfurization process and additive technology, applied in the field of flue gas purification, can solve the problems of high operating costs, slow leaching rate of coal-based pyrite, large liquid gas, etc., to increase leaching rate, increase mass transfer reaction rate, and improve leaching speed effect

Active Publication Date: 2015-10-21
青岛赛诺威尔工业水处理有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the liquid gas required by the coal slurry flue gas desulfurization process is relatively large, and the operating cost is relatively high.
In addition, the leaching rate of coal measure pyrite is also slow

Method used

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  • Additive Enhanced Coal Slurry Flue Gas Desulfurization Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A coal-fired boiler with a rated evaporation capacity of 75t / h and a flue gas volume of 100,000 Nm 3 / h, SO 2 Content 1300mg / Nm 3 , flue gas temperature 135 ℃.

[0026] The absorption tower is a spray tower with a diameter of 4m and a height of 25m. The bottom of the absorption tower is used as a circulation pool. The operating liquid-gas ratio of the absorption tower is 6L / Nm 3 , the solid-liquid mass ratio of coal slurry is 2:10, the concentration of aluminum sulfate in the slurry (calculated as aluminum) is 200mg / L, the residence time of the slurry in the circulation tank is 10min, the desulfurization rate reaches 94%, and the coal slurry circulates for 10 hours The iron leaching rate is 15%.

Embodiment 2

[0028] A coal-fired boiler with a rated evaporation capacity of 75t / h and a flue gas volume of 100,000 Nm 3 / h, SO 2 Content 3300mg / Nm 3 , flue gas temperature 135 ℃.

[0029] The absorption tower is a spray tower with a diameter of 4m and a height of 25m. The bottom of the absorption tower is used as a circulation pool. The operating liquid-gas ratio of the absorption tower is 13L / Nm 3 , the solid-liquid mass ratio of coal slurry is 2:10, the concentration of aluminum ash in the slurry (calculated as aluminum) is 600mg / L, the residence time of the slurry in the circulation tank is 10min, the desulfurization rate reaches 98%, and the coal slurry circulates for 10 hours The iron leaching rate was 22%.

Embodiment 3

[0031] A coal-fired boiler with a rated evaporation capacity of 150t / h and a flue gas volume of 200,000 Nm 3 / h, SO 2 Content 1500mg / Nm 3 , flue gas temperature 125 ℃.

[0032] The absorption tower is a spray tower with a diameter of 5.5m and a height of 29m. The bottom of the absorption tower is used as a circulation pool. The operating liquid-gas ratio of the absorption tower is 8L / Nm 3 , the solid-liquid mass ratio of coal slurry is 2:10, the concentration of aluminum ash in the slurry (calculated as aluminum) is 300mg / L, the residence time of the slurry in the circulation tank is 10min, the desulfurization rate reaches 95%, and the coal slurry circulates for 10 hours The iron leaching rate reaches 16%.

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Abstract

The invention discloses a flue gas desulfurization technology through an additive enhanced coal slurry method, and belongs to the technical field of flue gas cleaning. The technology comprises the steps that coal powder or coal slime is prepared into a slurry liquid with water; at least one of aluminum ash, aluminum, aluminum oxide and aluminum sulfate is added to the slurry liquid and serves as an enhancing additive for washing flue gas containing sulfur dioxide; sulfur dioxide in the flue gas is oxidized into sulfate radical; pyritic sulfur in coal or the coal slime is also oxidized into sulfate radical; and generated sulfate radical reacts with limestone to form gypsum to be separated out. The adopted additive can increase a mass transfer reaction rate of sulfur dioxide in the slurry liquid, so that a flue gas desulfurization rate is increased. In addition, the additive can also increase a leaching rate of coal-series pyrite, so that a leaching efficiency is improved, and the sulfur content of the pyrite in the coal or the coal slime is reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to an additive-intensified coal slurry method flue gas desulfurization process, which effectively reduces the pyrite sulfur content in coal or coal slime while removing sulfur dioxide in flue gas. Background technique [0002] Lime / limestone wet method has become the most widely used flue gas desulfurization technology because of its advantages such as high desulfurization rate, high utilization rate of desulfurizer, and low cost of desulfurizer. However, the desulfurization direct product of this method is acid-soluble calcium sulfite, which must be oxidized into gypsum to meet the landfill requirements. In addition, this method also has problems such as equipment fouling and blockage. [0003] The sulfur in coal includes organic sulfur, pyrite sulfur and sulfate sulfur, etc. The flue gas is washed with coal slurry or coal slurry, and the sulfur dioxide and oxygen in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 孙文寿姜阳刘京春朱蕾
Owner 青岛赛诺威尔工业水处理有限公司
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