Pneumatic ash conveying method and device for controlling material level for thermal power plant

Abstract

The invention relates to a pneumatic ash conveying method and device for controlling the material level for a thermal power plant, and belongs to the technical field of energy conservation of the thermal power plant. An ultrasonic level gauge or a radar level gauge is mounted on an electric precipitation ash hopper; a material level alarming signal is set according to the ash storage amount in the ash hopper; when passing through an electric field of electric precipitation, ash in flue gas is adsorbed to an anode plate by ionization, an anode vibrates and knocks the anode plate, the ash on the anode plate drops in the ash hopper, and the ash storage amount in the ash hopper is measured through the level gauge of the ash hopper; during high I value alarming on the material level of the ash hopper, an ash conveying unit of the ash hopper begins to convey ash; and after a high I value alarming signal disappears, ash conveying is finished. Pneumatic ash conveying can be carried out according to the ash storage amount of the ash hopper, the circumstance of ash conveying of empty tubes of a pneumatic ash conveying system is stopped, waste of compressed air is reduced, loading working time of an ash conveying air compressor is shortened, and power consumption on ash conveying is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of energy saving in thermal power plants, in particular to a method and device for pneumatically conveying ash for material level control in thermal power plants. Background technique [0002] The design output of the pneumatic ash conveying system in a thermal power plant is generally calculated according to the low calorific value and ash content of the designed coal type under the maximum load, and there will be a margin of about 150%. When the ash conveying system is running, each ash conveying The unit corresponds to one ash conveying pipeline, and multiple ash conveying pipelines are operated through the interlocking of the pipelines and continuously conveying ash one by one in turn. Even under full load conditions, because the ash volume is less than the design volume, the pipeline will run without load, resulting in compressed air And the waste of power consumption of the ash conveying air compressor...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method and device for pneumatically ash conveying with reasonable structural design for thermal power plant material level control, so as to solve the problem of empty pipe ash conveying in the ash conveying unit and reduce fire Reduce the power consumption of ash transmission in power plants and improve the economy of the unit

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