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Compound desulfurizing process of circulating fluidized bed boiler

A technology of circulating fluidized bed and desulfurization process, which is applied in the direction of fluidized bed combustion equipment, chemical instruments and methods, fuel burned in a molten state, etc. It can solve the problems of desulfurization agent waste, desulfurization efficiency drop, and flying out of the furnace, etc., to achieve Realize the effect of economy, broad application prospect and guarantee of environmental protection

Inactive Publication Date: 2003-03-12
SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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Problems solved by technology

[0004] However, in the actual operation of circulating fluidized bed boilers, the combustion temperature is generally 900-1100 ° C, which exceeds the optimum temperature for combustion desulfurization of circulating fluidized bed boilers, resulting in a significant drop in combustion desulfurization efficiency in the furnace , under normal circumstances, the desulfurization efficiency is 30-40%; at the same time, the desulfurizer will fly out of the furnace with the flue gas, resulting in waste of desulfurizer

Method used

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  • Compound desulfurizing process of circulating fluidized bed boiler
  • Compound desulfurizing process of circulating fluidized bed boiler
  • Compound desulfurizing process of circulating fluidized bed boiler

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[0017] Attached below figure 1 A preferred embodiment of the present invention is given.

[0018] Limestone particles with a particle size of less than 2mm are sent to the circulating fluidized bed boiler 3 by the limestone feeding device 2, and the CaO particles calcined and decomposed in the furnace undergo a gas-solid reaction with sulfur dioxide at the bed temperature in the furnace, and the larger particles of calcium oxide particles After being separated from the coal-fired particles by the high-temperature separator of the circulating fluidized bed boiler, they enter the bed for further reaction, remove part of the sulfur dioxide and complete the combustion desulfurization process in the bed. Calcium oxide particles with a particle size smaller than the cutting particle size of the high-temperature separator enter the humidification tower 6 through the tail flue 5 and the Venturi 13 with the flue gas, and a water atomization system 7 is arranged on the upper part of the...

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Abstract

A combined desulfurizing process for removing the SO2 gas from the flue gas generated by circualting fluidized-bed boiler is characterized by that the raw lime stone reacts with the SO2 in the bed layer of boiler to remove part of SO2 by combustion and the unreacted and escaped calcium oxide further reacts with SO2 in the moistening tower for external removal of SO2. Its advantages are low cost and optimal desulfurizing effect.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a composite desulfurization process for a circulating fluidized bed boiler used for removing sulfur dioxide gas in flue gas generated after combustion of the circulating fluidized bed boiler. 2. Background technology [0002] At present, the desulfurization method of circulating fluidized bed boiler is mainly combustion desulfurization. The combustion desulfurization process of the circulating fluidized bed boiler is to send lime particles with a particle size of less than 2.0mm into the furnace, and the limestone is decomposed into calcium oxide and carbon dioxide. The calcium oxide reacts with the sulfur dioxide gas generated by combustion to achieve the purpose of desulfurization. [0003] In the combustion desulfurization process of circulating fluidized bed boilers, in addition to the influence of limestone particle size on desulfurization, th...

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Application Information

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IPC IPC(8): B01D53/50B01D53/83F23C10/02
Inventor 马春元董勇陈莲芳徐夕仁李京李玉忠田风国周广锋
Owner SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
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