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Acetylene sludge desulfurization method and equipment for coal-fired boiler

A coal-fired boiler and calcium carbide slag technology, which is applied in the field of flue gas purification, can solve the problems of large equipment maintenance, large equipment investment, and increased staffing, and achieve the effect of reducing SO2 emissions

Active Publication Date: 2014-12-10
内蒙古君正化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this technology are: large investment in equipment, complex system, increased staffing, and large amount of equipment maintenance

Method used

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  • Acetylene sludge desulfurization method and equipment for coal-fired boiler
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  • Acetylene sludge desulfurization method and equipment for coal-fired boiler

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Experimental program
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Effect test

Embodiment 1

[0044] The coal-fired boiler of this embodiment is located in the 1# boiler of Junzheng Thermal Power Plant in Wuhai, Inner Mongolia.

[0045] Desulfurization equipment see figure 1 , including Roots blower 5 for conveying desulfurizer, feeding pipe 7, and feeding system;

[0046]The Roots blower 5 is arranged on the conveying pipeline, and the conveying pipeline adopts a pipe distributor near the furnace to enter two groups of feeding pipes of the front wall and the rear wall, and the feeding pipe 7 is connected with the secondary air pipe of the coal-fired boiler, The material pipe is opened at the elbow where the lower secondary air pipe enters the furnace, and penetrates the calcium carbide slag feed pipe to the end of the lower secondary air port along the direction of the secondary air pipe entering the furnace, and is welded and connected (see Figure 4 , the arrow at the secondary air inlet 13 indicates the air intake direction), and it is connected to the secondary a...

Embodiment 2

[0051] Embodiment 2: the operation of desulfurization

[0052] The main component of carbide slag is Ca(OH) 2 , as the industrial waste slag left over from calcium carbide plus water to generate acetylene gas, the calcium contained in it can be combined with SO in the flue gas in the form of CaO 2 Reaction, reduce SO2 emission to realize desulfurization in circulating fluidized bed boiler furnace. However, the problems of calcium carbide slag transportation blockage, uneven feeding, incomplete reaction, and large fluctuations in desulfurization indicators of circulating fluidized bed boilers have not been resolved. , Insufficient response, large fluctuation of desulfurization index and other problems.

[0053] The desulfurizer uses calcium carbide slag with a moisture content of less than 2% after drying, and chooses the technology of feeding from the secondary air outlet of the boiler. The calcium carbide slag material enters the furnace under the action of the secondary ai...

Embodiment 3

[0060] Embodiment 3: the operation of desulfurization

[0061] Adopt the system of embodiment 1 to carry out in-furnace desulfurization:

[0062] 1) Carbide slag has been dried (particle diameter is about 0.5mm) and the water content is less than 2%, and the carbide slag is blown in at a bed temperature of 850°C;

[0063] 2) Use a Roots blower to blow calcium carbide slag into the furnace of the coal-fired boiler. When it penetrates into the furnace, the amount of fuel when burning is 70t / h. The calcium sulfur ratio is 2. The fuel burned by the coal-fired boiler is 40% of raw coal, 40% of washed medium coal, 20% of coal gangue, and the particle size is 0-9mm. The sulfur content of the fuel is 1.3%.

[0064] The primary air inlet temperature of the coal-fired boiler is 245°C, the secondary air inlet temperature is 245°C, and the temperature before the calcium carbide slag enters the furnace is 20°C to 25°C.

[0065] Two sets of desulfurization systems are running, one set ...

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Abstract

The invention belongs to the field of flue gas purification and provides an acetylene sludge desulfurization method for a coal-fired boiler. The method comprises the following steps: (1) drying the acetylene sludge until the moisture content is less than 2 percent; and (2) blowing the acetylene sludge into a hearth of the coal-fired boiler by using a Roots blower, wherein the blowing position is a bend at a secondary air inlet below front and rear walls of the hearth, and four blowing points are distributed on the front wall and another four blowing points are distributed on the rear wall. The main component of the acetylene sludge is Ca(OH)2, calcium element contained in industrial waste residues remained in acetylene gas generated by adding water into calcium carbide can be reacted with SO2 in flue gas in a CaO form, SO2 emission is reduced, and desulfurization in a circulating fluidized bed boiler is realized. However, the acetylene sludge delivery and blockage problem and the problems such as feeding non-uniformity, incomplete reaction and large desulfurization indicator fluctuation in the circulating fluidized bed boiler are not solved. According to the invention, the problems of blockage, feeding non-uniformity, incomplete reaction and large desulfurization indicator fluctuation in the acetylene sludge delivery process are solved.

Description

technical field [0001] The invention belongs to the field of flue gas purification, and in particular relates to a desulfurization method for a coal-fired boiler and equipment used therein. Background technique [0002] Calcium carbide is calcium carbide, chemical formula CaC 2 . Calcium carbide is the raw material for the organic synthesis of PVC (polyvinyl chloride). With the expansion of my country's PVC production capacity, the discharge of carbide slag is increasing, causing serious environmental pollution. The recycling of calcium carbide slag is an industrial "three wastes" treatment project. It can not only solve the pollution problem of difficult-to-handle industrial waste residues such as calcium carbide slag, but also reduce the impact of limestone resource mining on the geological environment through the recycling of calcium resources. At the same time reduce the emission of Ca0 from limestone calcination. This will largely solve the problem of environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/50F23N3/00
Inventor 王海勤马廷龙杨海生张俊峰张海玲
Owner 内蒙古君正化工有限责任公司
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