Surface ash clearing device of pipe heat exchanger

Abstract

The invention discloses a surface ash clearing device of a pipe heat exchanger. The clearing device comprises a heat exchanger pipe bundle arranged in a smoke channel, a dust-removing hole plate, a driving connection rod, a smoke resistance sensor, a motor and a controller. The dust-removing hole plate is provided with a plurality of through holes, a heat exchanger pipe outer ring of the heat exchanger pipe bundle respectively penetrates through the through holes, two ends of the driving connection rod are respectively connected with the dust-removing hole plate and a motor rotating shaft, the output end of the controller is connected with the control signal input end of the motor, the smoke resistance sensor is arranged in the smoke channel, and the signal output end is connected with the signal input end of the controller. The clearing device is capable of effectively and conveniently clearing surface ash of heat exchanger pipes, avoids the shortcoming of a traditional ash blowing mode, and ensures stable and economical operation of a boiler.

Description

technical field [0001] The invention relates to a device for removing dust accumulated on the surface of a tubular heat exchanger. Background technique [0002] Tube heat exchangers are mostly used in the tail flue of the boiler to exchange heat for the flue gas, and collect the waste heat of the flue gas for reuse. When the flue gas in the tail flue of the boiler scours the tube bundle of the heat exchanger, a vortex zone is formed on the leeward side of the tube, and the ash particles with large particle size are not easily drawn into the vortex zone because of their high kinetic energy; With strong adsorption force, it is easy to be drawn into the vortex and hit the pipe wall to form dust accumulation. Fly ash accumulated on the surface of heat exchanger tubes with low flue temperature at the tail of the boiler is generally dry and loose, which belongs to loose ash accumulation. [0003] Ash accumulation leads to increased heat transfer resistance, lower heat transfer c...

AI Technical Summary

Problems solved by technology

Both of these two sootblowing methods can remove soot deposits to a certain extent, but due to structural characteristics, steam soot blowing will increase the humidity of the flue gas, which is more likely to cause soot deposits, poor operational reliability, high equipment failure rate, and high maintenance costs; The soot blowing effect of the sonic soot blower is not obvious, and the investment and maintenance costs are relatively high

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