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Slurry for desulfuration and denitration of recirculating fluidized bed boiler

A circulating fluidized bed, desulfurization and denitrification technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low desulfurization efficiency and low utilization rate of desulfurization agents, achieve good effects, improve desulfurization performance, The effect of high utilization

Active Publication Date: 2014-01-08
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defects existing in the desulfurization and denitrification technology of circulating fluidized bed boilers, the present invention provides a slurry for desulfurization and denitrification of circulating fluidized bed boilers. The desulfurization efficiency of limestone is low, the utilization rate of desulfurizer is low, and the problem of low-cost denitrification

Method used

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  • Slurry for desulfuration and denitration of recirculating fluidized bed boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A thermal power plant uses raw coal with a sulfur content of 1.94% and a nitrogen content of 0.89%.

[0021] Desulfurization agent ratio: limestone 78% (fineness 2 and NO x The reaction produces sulfate and N 2 .

[0022] In the same coal-fired boiler, the concentrations of sulfur dioxide and nitrogen oxides were measured before and after the desulfurization and denitrification agent slurry was injected.

[0023] Average emission concentration of sulfur dioxide before desulfurization and denitrification: 4212mg / m 3 , the average emission concentration of nitrogen oxides is 215mg / m 3 , after spraying the desulfurization and denitrification agent slurry, the average emission concentration of sulfur dioxide was measured to be 326mg / m 3 , the average emission concentration of nitrogen oxides is 69mg / m 3 , ammonia escape is less than 5mg / m 3 .

Embodiment 2

[0025] A company's self-owned power plant uses raw coal with a sulfur content of 0.73% and a nitrogen content of 0.71%.

[0026] Desulfurization agent ratio: limestone 78% (fineness 2 and NO x The reaction produces sulfate and N 2 .

[0027] In the same coal-fired boiler, the concentrations of sulfur dioxide and nitrogen oxides were measured before and after the desulfurization and denitrification agent slurry was injected.

[0028] Average emission concentration of sulfur dioxide before desulfurization and denitrification: 1538mg / m 3 , the average emission concentration of nitrogen oxides is 163mg / m 3 , after spraying the desulfurization and denitrification agent slurry, the average emission concentration of sulfur dioxide was measured to be 145mg / m 3 , the average emission concentration of nitrogen oxides is 54mg / m 3 , ammonia escape is less than 5mg / m 3 .

Embodiment 3

[0030] A company's self-owned power plant uses raw coal with a sulfur content of 1.43% and a nitrogen content of 0.82%.

[0031] Desulfurizer ratio: limestone 80% (fineness 2 and NO x The reaction produces sulfate and N 2 .

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Abstract

The invention discloses slurry for desulfuration and denitration of a recirculating fluidized bed boiler, which comprises desulfurizing agent slurry and a denitrfying agent solution. Composite desulfurizing and denitrfying agent slurry is prepared by adopting a calcium based absorbing agent, an additive, a co-additive and an amino reducing agent according to a certain proportion and programs and used for being atomized and sprayed into a region at the top of the recirculating fluidized bed boiler through a nozzle to react with SO2 and NOx in smoke to generate sulfate and N2. By applying the slurry disclosed by the invention, the problems of low desulfuration efficiency of calcined limestone doped in the recirculating fluidized bed boiler and low utilization rate of the desulfurizing agent are solved, desulfuration and denitration are realized simultaneously, the desulfuration efficiency reaches 85-95 percent and the denitration efficiency reaches 50-70 percent. The slurry has the advantages of low investment and operation costs and convenience for implementation.

Description

technical field [0001] The invention relates to a slurry used for desulfurization and denitrification of circulating fluidized bed boilers, and belongs to the technical field of desulfurization and denitrification of flue gas of coal-fired boilers. Background technique [0002] Fluidized bed boiler is the main form of existing small and medium-sized thermoelectric boilers. The environmental protection advantage of conventional fluidized bed boilers is that their design temperature is 850 ° C ~ 900 ° C, which is the most suitable temperature for ordinary limestone to fix sulfur, and most of the nitrogen in coal is converted into N 2 O and NO are emitted into the atmosphere. [0003] N 2 O is in CO 2 、CH 4 After the third largest greenhouse gas, and has the effect of destroying the ozone layer. In the actual operation of fluidized bed boilers, there is a contradiction between desulfurization and improving combustion efficiency. In order to achieve higher boiler efficiency,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/78B01D53/60F23J15/04
CPCY02A50/20
Inventor 韩奎华李英杰赵建立路春美王永征程世庆
Owner SHANDONG UNIV
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