Heating surface rotary air preheater capable of reducing ash clogging of rotor

Abstract

The invention provides a heating surface rotary air preheater capable of reducing ash clogging of a rotor. The heating surface rotary air preheater comprises the rotor, wherein a plurality of partition plates are arranged in the rotor, the partition plates divide the rotor into a plurality of fan-shaped bin chambers, a heat transfer element is arranged in each bin chamber, the rotor is in transmission connection with a drive motor through a rotating shaft, the rotor is rotationally arranged on a machine frame, one end of the rotor is a hot end, the other end of the rotor is a cold end, a smokeinlet, a high-pressure primary air outlet and a low-pressure secondary air outlet are formed in the hot end of the rotor, a smoke outlet, a high-pressure primary air inlet and a low-pressure secondary air inlet are formed in the cold end of the rotor, and the smoke outlet and the smoke inlet are connected through a smoke channel penetrating through the rotor in the axial direction. The inventionaims to provide a device capable of reducing or avoiding the ash depositions and scales on the inner walls of the chambers and on the surfaces of the heat transfer elements, ash depositions on the inner walls of the chambers and the surfaces of the heat transfer elements are more conveniently cleaned, the heat exchange efficiency is high, the service life is long, and ash clogging of the rotor canbe reduced.

Description

technical field [0001] The invention relates to a rotary air preheater with a heating surface that can reduce clogging of a rotor. Background technique [0002] The existing rotary air preheater on the heating surface usually includes a shell, in which a cylindrical rotor is rotatably installed in the vertical direction, and a plurality of partitions are arranged in the radial vertical direction in the rotor, and the partitions The plate divides the rotor into several fan-shaped compartments, each compartment is equipped with heat transfer elements, and the right side of the shell is provided with a flue gas channel along the vertical direction, and the flue gas channel passes through the compartments of the rotor in the shell. The lower end of the gas channel, that is, the cold end of the rotor is the smoke outlet, and the upper end of the flue gas channel, that is, the hot end of the rotor, is the smoke inlet. The left side of the housing is respectively provided with a lo...

AI Technical Summary

Problems solved by technology

However, during the use of the existing rotary air preheater on the heating surface, there will be a certain amount of condensation in the flue gas passing through the flue gas channel, which will condense into a liquid state at a relatively low temperature. When passing through the chamber on the rotor in the flue gas passage, if the temperature of the inner wall of the chamber is low, the condensate will be deposited on the inner wall of the chamber at the lower temperature and on the surface of the heat transfer element. The existence of condensate in the flue gas will cause a large amount of dust to accumulate on the inner wall of the chamber and on the surface of the heat transfer element, and eventually lead to serious blockage of the flue gas channel, low-pressure secondary air channel, and high-pressure primary air channel, resulting in poor heat transfer. The efficiency is greatly reduced, so that it has to be cleaned and dredged, so that the equipment can work normally

In addition, the existing method of cleaning the dust accumulated on the inner wall of the chamber and the surface of the heat transfer element is to use pressure gas to blow soot, which has a poor cleaning effect, resulting in a decrease in the heat exchange efficiency of the equipment and a waste of energy

[0003] The lower temperature of the inner wall of the above-mentioned chamber usually occurs at the cold end of the rotor, because the air entering the rotor will efficiently cool the cold end of the rotor. When it does not rise, the condensation in the flue gas will accumulate on the inner wall of the chamber and the surface of the heat transfer element, resulting in serious blockage of the flue gas passage, low-pressure secondary air passage, and high-pressure primary air passage, and a significant reduction in heat transfer efficiency

[0004] In addition, most of the hot air that leaks between the hot-end fan-shaped plate between the flue gas and the secondary air and the end face of the rotor, and between the hot-end fan-shaped plate and the end face of the rotor between the flue gas and the primary air will flow into the negative pressure. The state of the flue gas channel and is discharged to the outside atmosphere, thus greatly increasing the heat loss of the boiler system

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