Low wind pressure improved and operation method of recirculating fluidized bed boiler
A technology of circulating fluidized bed and fluidized bed boiler, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in molten state, etc., and can solve problems such as improper operation adjustment and high energy consumption
Inactive Publication Date: 2011-10-19
中国电力企业联合会科技开发服务中心
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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.
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[0019] As shown in the figure, the fluidized bed boiler low wind pressure improvement and operation method 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 pre...
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The invention discloses a low wind pressure improved and operation method of a recirculating fluidized bed boiler, the operation method comprises a low wind pressure improved technology and a low wind pressure operation method, wherein, the low wind pressure improved technology comprises the following steps of: the cross section of a second wind branch pipe is expanded and gradually shrinks, the cross section of a second wind branch pipe expands and the quantity of a second wind nozzle is reduced, a small resistance type blast cap is adopted to reduce the thickness of a start-bed-material, the length of the second wind pipe nozzle is extended and inserted into a stove for 500mm or a distributary platform arranged on the upper part of second wind. The low wind pressure operation method comprises a control hearth differential pressure which is used for controlling hearth differential pressure to be, and the air quantity at one time to be not more than 1.2-1.3 times the critical fluidization air quantity. The invention has the advantages of banishing the tradition method of high wind pressure recirculating fluidized bed boiler, the low wind pressure thinking is used for guiding and operating adjustment, and technology improvement is performed on the fluidized bed boiler to realize notable energy-saving recirculating fluidized bed boiler by using the low wind pressure idea.
Description
technical field [0001] The invention clearly relates to a circulating fluidized bed boiler, in particular to an energy-saving circulating fluidized bed boiler low wind pressure improvement technology and operation method. 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, and there are more than 20 large-scale circulating fluidized bed power plant boilers above 1025t / h (more than 50 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 fo...
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IPC IPC(8): F23C10/20
Inventor 张全胜
Owner 中国电力企业联合会科技开发服务中心