Return ash control device of circulating fluidized bed boiler return feeder and control method

Abstract

The invention relates to a return ash control device of a circulating fluidized bed boiler return feeder and a control method. The device comprises a return ash storage tank, one side of the return ash storage tank communicates with a return feeder ash discharge pipe through a feeding pipe, the other side of the return ash storage tank communicates with a bottom flue of an air preheater through afirst ash discharge pipe, the top of the return ash storage tank communicates with the bottom flue of the air preheater through an exhaust pipe, and the bottom flue of the air preheater communicates with a dust remover; and an air distribution plate is arranged at the bottom in the return ash storage tank, an air chamber is formed between the air distribution plate and the bottom surface of the return ash storage tank, the air chamber is connected with a primary fan through an aeration air inlet pipe, and the feeding pipe, the first ash discharge pipe, the exhaust pipe and the aeration air inlet pipe are provided with a feeding pipe electric switch valve, an ash discharge pipe electric switch valve, an exhaust pipe electric ball valve and an aeration air electric ball valve correspondingly. The return ash control device of the return feeder can adjust and control the return ash amount of the return feeder without secondary pollution, and energy in the return ash can be reused.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler return ash control device and control method. Background technique [0002] At the end of the 20th century, a circulating fluidized bed combustion technology with many advantages, such as wide fuel adaptability, high combustion efficiency, strong ability to change working conditions, low smoke exhaust pollutant content, and good comprehensive utilization of ash, was obtained in China. Universal application. [0003] In the actual production process of industrial circulating fluidized bed boilers, it is inevitable that the use of raw coal may deviate from the design index, resulting in changes in the normal operating conditions of the boiler, especially when the coal type with ash content far exceeding the design value will be used. It directly leads to an increase in the amount of material returned to the feeder, which induces low temperature o...

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the present invention proposes a circulating fluidized bed boiler return material return ash control device and control method to solve the problem that the existing return material return ash cannot be accurately controlled, thereby affecting the return of the material. The increase in the amount of feed back to the boiler leads to technical problems in the stability of the boiler operation and the deterioration of the processing capacity of the environmental protection facilities

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