Operation method of circulating 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, and fuel burned in a molten state, to achieve the effect of saving equipment maintenance costs and costs

Inactive Publication Date: 2010-05-19
云南能投红河发电有限公司
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Problems solved by technology

[0003] However, the coals used in many areas of our country have strong self-crushing ability, such as lignite is a typical example, so it is necessary to find an operation method suitable for coal-fired coal with strong self-crushing ability to maintain the normal bed pressure of circulating fluidized bed boilers

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  • Operation method of circulating fluidized-bed boiler

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Embodiment Construction

[0009] The 300,000-kilowatt circulating fluidized bed boiler uses lignite from the Xiaolongtan Coal Mine in Yunnan as coal, and the coal quality information is shown in the table below:

[0010]

[0011] The coal conveying system has been technically transformed, and the eight cage-type fine crushers (large and small) of the coal conveying secondary crushing system have been dismantled to crush the coal particle size to less than 50mm and send it directly into the furnace. The lower bed pressure reaches 11KPa, and the residence time of coal particles in the furnace is 20min. It not only saves the power consumption of the factory, but also optimizes the control of the bed pressure and bed temperature of the 300,000-kilowatt circulating fluidized bed boiler, ensuring the safe and long-term operation of the 300,000-kilowatt circulating fluidized bed boiler.

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Abstract

The invention belongs to an operation method of a circulating fluidized-bed boiler, in particular to an operation method for keeping the normal bed press of fire coal with strong self-crushing capability. The operation method comprises the steps of: when lignitous coal is used as the fire coal of the circulating fluidized-bed boiler, crushing the grain diameter of the fire coal to 40 mm-50 mm; and keeping the bed press of the lower part of a furnace cavity to achieve 9 KPa to 11 KPa, wherein the residence time of coal grains in the furnace cavity is 10 seconds to 20 seconds. The invention disassembles eight cage type fine crushers of a second-grade coal-transporting crushing system, can save the equipment maintenance cost of the eight cage type fine crushers, also ensure the requirements for the coal transported into a furnace, reasonably increase the residence time of the coal grains in the furnace cavity, enhance the burning efficiency and reduce the workload of bed material increase, thereby achieving the balancing state of the inside and outside circulation of boiler materials.

Description

technical field [0001] The invention belongs to an operating method of a circulating fluidized bed boiler, in particular to an operating method for maintaining normal bed pressure for burning coal with strong self-crushing ability. Background technique: [0002] At present, the 300,000-kilowatt circulating fluidized bed boiler used in China was originally designed as a two-stage crushing system, of which the secondary crushing system is equipped with two large cage fine crusher motors for each belt, the model is YKK450-6, and the rated voltage is 6kV. , rated capacity 400kW, rated current 49A; 2 small cage fine crusher motors, model YKK400-5, rated voltage 6kV rated capacity 280kW, rated current 36A, all produced by Shenyang Electric Machinery Factory. The design value of coal particle size into the furnace is that the maximum particle size cannot exceed 8mm. It has been proved by operation practice that when coal with strong self-crushing ability is used, due to the high v...

Claims

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Application Information

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IPC IPC(8): F23C10/28
Inventor 白云林段国海
Owner 云南能投红河发电有限公司
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