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System and method for bed temperature control of circulating fluidized bed boiler based on fuel self-balance

A circulating fluidized bed, self-balancing technology, applied in the combustion method, fluidized bed combustion equipment, fuel burning in the molten state, etc., can solve the problems of uneven furnace bed temperature distribution, easy local overtemperature, etc., to overcome disturbances , Reduce the maintenance rate, the effect of accurate coal feeding

Active Publication Date: 2017-06-20
DATANG WUAN POWER GENERATION
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a system and method for controlling the bed temperature of a circulating fluidized bed boiler based on fuel self-balancing for problems such as uneven distribution of furnace bed temperature and easy local overheating.

Method used

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  • System and method for bed temperature control of circulating fluidized bed boiler based on fuel self-balance
  • System and method for bed temperature control of circulating fluidized bed boiler based on fuel self-balance
  • System and method for bed temperature control of circulating fluidized bed boiler based on fuel self-balance

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Embodiment Construction

[0033] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0034] This example is a fuel self-balancing based circulating fluidized bed boiler bed temperature control method. figure 1 It is a principle diagram of the coal feeding main control adjustment loop of a fuel self-balancing circulating fluidized bed boiler bed temperature control method provided by the present invention. As shown in the figure, the coal feeding main control regulation loop includes a PID regulator unit 101 , a first handheld controller regulation unit 102 , a subtractor 103 , an adder 104 and a second handheld controller regulation unit 105 . The main control loop for coal supply receives the total coal supply command output from the main control of the boiler and the actual feedback of each coal fee...

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Abstract

The invention discloses a coal supply self-balancing system and method for bed temperature control of a circulating fluidized bed boiler. The system comprises a coal supply main-control adjustment loop and a multi-execution coal supply adjustment loop, wherein the coal supply main-control adjustment loop receives a coal supply main command output by a boiler main controller; the output command is sent to two sides of the multi-execution coal supply adjustment loop respectively; after calculation on each side, automatic coal supply commands are respectively distributed to all automatic coal feeders according to a certain proportion, so that the coal supply quantity conforms to the command requirement of the system. The coal supply self-balancing system and method have the benefit that the bed temperature of the circulating fluidized bed boiler is kept stable by the fuel self-balancing method, so that unit load fluctuation caused by frequent adjustment of the primary air quantity is avoided.

Description

technical field [0001] The invention belongs to the field of coal feeding control of thermal power generating units, and in particular relates to a system and method for controlling bed temperature of a circulating fluidized bed boiler based on fuel self-balancing. Background technique [0002] Circulating fluidized bed boiler (CFB) combustion technology is a clean coal combustion technology that has developed rapidly in the past 30 years. Due to its wide fuel adaptability, wide load adjustment ratio, high combustion efficiency, low temperature combustion, and desulfurization in the furnace It has been rapidly promoted at home and abroad, especially because of the complex and changeable coal quality, high sulfur content and large output of low-quality coal in my country's coal resources, which makes CFB combustion technology get faster and wider application in my country. [0003] The bed temperature is an important parameter to characterize the normal operation of the CFB bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C10/28
CPCF23C10/28
Inventor 乔金玉刘吉臻张文广
Owner DATANG WUAN POWER GENERATION
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