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Purifying method for boiler fume

A boiler flue gas and boiler technology, which is applied in the field of reducing harmful substances in boiler flue gas, can solve the problems of high investment costs and high equipment operating costs, and achieve the effects of large extraction volume, simple process, and improved thermal efficiency

Inactive Publication Date: 2010-01-06
BAOSHAN IRON & STEEL CO LTD +1
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AI Technical Summary

Problems solved by technology

Wet desulfurization technology has high desulfurization efficiency and high utilization rate of absorbent, but its disadvantages are high investment cost and high equipment operation cost

Method used

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  • Purifying method for boiler fume
  • Purifying method for boiler fume
  • Purifying method for boiler fume

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Experimental program
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Embodiment Construction

[0035] A boiler flue gas purification method mainly includes the following steps:

[0036] (1) Extract 30% of the air volume from the secondary air of the coal-fired boiler, and spray it into the upper part of the boiler at high speed. The location where the secondary air is injected is located below the refraction angle on the front wall or side wall of the boiler. The speed of injection is 150m / s, and two rows\14 nozzles are used to inject in an asymmetric injection mode.

[0037] (2) Simultaneously spray limestone mud, a by-product of steelmaking, as a sulfur adsorbent. The position where the limestone mud is injected is at the same height or above the position where the secondary air is injected, and the temperature of the limestone mud is 980-1100°C. Both the secondary air nozzle and the limestone slurry nozzle adopt adjustable nozzles.

[0038] Such as figure 1 As shown, at position 1, extracting 30% of the secondary air volume of the coal-fired boiler can reduce the...

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Abstract

The invention discloses a purifying method for boiler fume, which comprises the following steps: sucking out 25 to 50 percent of second wind of a coal-burning boiler, and spouting the second wind to the upper part of the boiler, wherein the spout-in position is below the flame diverting angle of the front wall or the side wall of the boiler, and the spout-in speed is at least 80m / s; and adopting at least two rows of spouts to sprout the wind in an asymmetrical mode. Meanwhile, byproducts of limestone mud / powder for steel melting at a temperature from 980 to 1,100 DEG C is used as a sulphuric adsorbent. The position for spouting into the limestone mud / powder is on the same height of the position for spouting into the second wind or above the he position for spouting into the second wind. Spouts for spouting the second wind and the limestone are adjustable. The invention effectively reduces the acidic substance in the boiler fume, has good effects of desulfurization and denitration, and reduces the production cost by using the technical scheme of the combination of fractional combustion and using the side product for steel melting as the desulfurization adsorbent.

Description

technical field [0001] The invention relates to a method for improving combustion and discharge of industrial boilers, in particular to a method for reducing harmful substances in boiler flue gas. Background technique [0002] In the combustion of boilers mixed with blast furnace gas, some elemental elements are oxidized to form acidic substances, such as SO 3 , NO, NO 2 , HCl, HF. In order to maximize the control of local acid rain and other problems caused by high acid gas, reducing the acidic substances such as nitrogen oxides and sulfides in boiler flue gas has become an important task for industrial boiler flue gas treatment. [0003] NO and NO 2 Known as NOx, in order to control NOx in boiler flue gas, the main measure is to reduce and reduce NOx generation from the source. The existing method is to maintain the original boiler combustion state in the coal-fired boiler, and realize staged combustion by introducing an external heat source. This method can reduce NOx...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/02F23B80/02
Inventor 沈晓林布莱恩·辛吉斯朱基木刘贵苏陈大维胡平岗石洪志刘道清宗仰炜
Owner BAOSHAN IRON & STEEL CO LTD
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