Low-air-pressure running method of circulating fluidized bed boiler
A technology of circulating fluidized bed and operation method, which is applied in the directions of fluidized bed combustion equipment, combustion method, fuel burned in a molten state, etc., can solve problems such as improper operation adjustment, high energy consumption, etc.
Inactive Publication Date: 2014-03-19
BEIJING XINGQIAO INT ENG TECH
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Problems solved by technology
The reason why the current CFB boiler consumes so much energy is due to the traditional design and traditional understanding formed by the introduction of foreign technology and improper operation adjustments.
Method used
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[0019] As shown in the figure, a low wind pressure operation method of a circulating fluidized bed boiler according to the present invention comprises the following steps:
[0020] 1. Expand the section of the upper and lower secondary air branch pipes 2 and 3 of the circulating fluidized bed boiler 1 by adopting a tapered section from large to small to reduce the local resistance at the interface and the resistance along the branch pipe, This can reduce the secondary air pressure and reduce the power consumption of the secondary fan. The cross-section of the secondary air branch pipe of the current CFB boiler is very small, resulting in great resistance of the secondary air, high wind pressure, and high power consumption of the fan.
[0021] 2. Expand the cross-section of the secondary air nozzle 4 (to 160*360mm) and reduce the number of secondary air nozzles 4 (preferably 20), thus reducing the local resistance at the interface and reducing the secondary air flow. Wind pres...
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Abstract
The invention discloses a low-air-pressure running method of a circulating fluidized bed boiler. The method comprises a low-air-pressure improvement technology and a low-air-pressure running method, wherein the low-air-pressure improvement technology is characterized in that the cross section of a secondary air branched pipe is increased and is gradually reduced, the cross sections of secondary air jet nozzles are increased, the quantity of the secondary air jet nozzles is reduced, a low-resistance air cap is adopted, the thickness of a starting bed material is reduced, and the lengths of the secondary air jet nozzles are increased, so that the secondary air jet nozzles are inserted into the boiler for 500mm, or a shunting table is arranged above secondary air; the low-air-pressure running method is characterized in that the pressure difference of a combustion chamber is controlled to be 800Pa, and primary air volume is regulated to not to exceed 1.2-1.3 times of the critical fluidization air volume. The low-air-pressure running method has the advantage of discarding a traditional method of the high-air-pressure circulating fluidized bed boiler, and a low-air-pressure thought is used for guiding operation adjustment and performing technological improvement, so that the circulating fluidized bed boiler which can remarkably save energy is realized.
Description
technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a low wind pressure operation method of a circulating fluidized bed boiler with energy-saving characteristics. Background technique [0002] my country is currently the country that uses the most circulating fluidized bed boilers (referred to as CFB boilers) in power plants in the world. There are more than 3,000 large and small circulating fluidized bed power plant boilers in operation, of which large circulating fluidized bed power plant boilers of 410t / h or more There are more than 140 units, and there are more than 100 large circulating fluidized bed power plant boilers above 1025t / h (more than 100 units are under construction). [0003] Dozens of secondary air pipes (circular pipes) are arranged on the front furnace wall and rear furnace wall of the conical water-cooled wall of the power station circulating fluidized bed boiler. The secondary air is to provide oxygen for ...
Claims
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Login to View More IPC IPC(8): F23C10/00F23C10/20F23L9/00
Inventor 张全胜安洋李勇
Owner BEIJING XINGQIAO INT ENG TECH