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Desulphurization method for burned smoke of circulating fluidized bedboiler

A circulating fluidized bed and boiler combustion technology, which is applied to chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of poor desulfurization effect, high cost, and low desulfurization efficiency, so as to save cost and input, reduce The effect of low usage and treatment cost

Inactive Publication Date: 2016-12-14
重庆合川盐化工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies existing in the prior art, the technical problem to be solved by the present invention is: Aiming at the technical problems of low desulfurization efficiency, poor desulfurization effect and high cost in the prior art fluidized bed boiler tail gas desulfurization method, a kind of Desulfurization method for combustion flue gas of circulating fluidized bed boiler with good desulfurization effect, high desulfurization efficiency and reduced overall cost

Method used

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  • Desulphurization method for burned smoke of circulating fluidized bedboiler

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for desulfurizing combustion flue gas of a circulating fluidized bed boiler, comprising the steps of:

[0031] 1) Limestone is crushed into limestone powder with a particle size of 345 meshes, and the limestone powder is introduced into the hearth of a circulating fluidized bed boiler; the circulating fluidized bed is a circulating fluidized bed with a processing capacity of 82t / h;

[0032] 2) Control the combustion temperature in the furnace to 900°C so that the limestone powder put into the furnace in step 1) is calcined into calcium oxide, and the calcined calcium oxide is in contact with the flue gas generated by the combustion of fuel in the furnace and with the sulfur and oxygen in the flue gas The compound reacts to generate calcium sulfate and calcium sulfite to complete the primary desulfurization of the combustion flue gas; the dosage of limestone powder is 5% of the fuel bituminous coal mass;

[0033] 3) Pass the combustion flue gas and the reaction ...

Embodiment 2

[0037] A method for desulfurizing combustion flue gas of a circulating fluidized bed boiler, comprising the steps of:

[0038] 1) Limestone is crushed into limestone powder with a particle size of 400 meshes, and the limestone powder is introduced into the hearth of a circulating fluidized bed boiler; the circulating fluidized bed is a circulating fluidized bed with a processing capacity of 82t / h;

[0039] 2) Control the combustion temperature in the furnace to 1100°C so that the limestone powder put into the furnace in step 1) is calcined into calcium oxide, and the calcined calcium oxide is in contact with the flue gas generated by fuel combustion in the furnace and with the sulfur and oxygen in the flue gas The compound reacts to generate calcium sulfate and calcium sulfite to complete the primary desulfurization of the combustion flue gas; the dosage of limestone powder is 10% of the fuel bituminous coal mass;

[0040] 3) Pass the combustion flue gas and the reaction produ...

Embodiment 3

[0045] A method for desulfurizing combustion flue gas of a circulating fluidized bed boiler, comprising the steps of:

[0046] 1) Limestone is crushed into limestone powder with a particle size of 500 mesh, and the limestone powder is blown into the furnace of a circulating fluidized bed boiler by pressurized air; the circulating fluidized bed is a circulating fluidized bed with a processing capacity of 82t / h ;

[0047] 2) Control the combustion temperature in the furnace to 1200°C so that the limestone powder put into the furnace in step 1) is calcined into calcium oxide, and the calcined calcium oxide is in contact with the flue gas generated by fuel combustion in the furnace and with the sulfur and oxygen in the flue gas The compound reacts to generate calcium sulfate and calcium sulfite to complete the primary desulfurization of the combustion flue gas; the dosage of limestone powder is 15% of the fuel bituminous coal mass;

[0048] 3) Pass the combustion flue gas and the...

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Abstract

The invention provides a desulphurization method for the burned smoke of a circulating fluidized bedboiler. The method provided by the invention comprises the following steps: limestone is added into smoke produced by the burning of a fuel inside the circulating fluidized bedboiler, so that an oxygen-sulfur compound in the smoke and the limestone are in calcinating reaction to accomplish primary desulfuration, after dedusting is performed on the smoke after primary desulfuration, a sodium hydroxide solution is sprayed onto the smoke treated through dedusting, so that unreacted sulphur oxides in the smoke and sodium hydroxide react to achieve secondary desulfuration. By adopting the method provided by the invention for desulfuration to the smoke of a boiler, the desulphurization efficiency can reach more than 85 percent each time, the desulphurization efficiency is improved by more than 20 to 30 percent, the content of sulfur dioxide in the smoke treated through desulfuration is equal to or smaller than 200mg / Nm3, the emission standard can be met strictly, and unexpected technical effects can be obtained.

Description

technical field [0001] The invention belongs to the technical field of tail gas desulfurization, and in particular relates to a method for desulfurizing combustion flue gas of a circulating fluidized bed boiler. Background technique [0002] As a mature high-efficiency, low-pollution and clean coal-fired boiler, circulating fluidized bed boiler has been widely used for its high combustion efficiency, wide adaptability of dyestuffs, and good environmental protection performance. However, circulating fluidized bed boilers use coal as fuel, and the exhaust gas after combustion of these coals contains a large amount of sulfide. If the exhaust gas is not treated and discharged into the air, it will easily pollute the atmosphere and cause environmental pollution. Existing methods for desulfurizing circulating fluidized bed boiler tail gas mostly use the alkaline desulfurization process to remove sulfur, which uses sodium hydroxide solution as a desulfurizer, and sprays the prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/50B01D53/78B01D53/75
CPCB01D53/502B01D53/508B01D53/75B01D2251/304B01D2251/404B01D2251/604
Inventor 李春阳蒋希云石远明涂代兵
Owner 重庆合川盐化工业有限公司
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