Rotary air preheater with hierarchical reverse rotation

Abstract

The invention provides a rotary air preheater with hierarchical reverse rotation, relating to equipment of heating cold air by using low temperature hot gas. The rotary air preheater comprises a shell, at least two stages of rotors, a bearing, a gas channel and an air channel. The multiple stages of rotors are arranged in series. A reverse transmission device is arranged between the rotation shafts of two adjacent stages of rotors, the rotation directions of two adjacent stages of rotors are opposite, radial sealing pieces are arranged at the junctions of adjacent channels between the two adjacent stages of rotors, and circumferential sealing pieces are arranged at rotor and shell gaps between the two adjacent stages of rotors. Through different rotation directions of front and back stages of rotors, a rotor hot storage piece which is cooled by air is alternatively heated by two side gas in an air preheater channel, the deviation of boiler flue gas discharge temperature is reduced, thus the early entering of a part of gas in the air preheater channel into a dew point area is avoided, the problems of cold end heat storage piece condensation, dust touch, corrosion, clogging and the like are reduced, the boiler gas discharge temperature is reduced, and the boiler efficiency is improved.

Description

technical field [0001] The invention relates to equipment for heating cold air by using low-temperature hot flue gas in a tail flue of a thermal power plant, and belongs to the technical field of energy and waste heat utilization of flue gas. Background technique [0002] Energy conservation and emission reduction has gradually become a hot topic of global concern. Improving energy utilization and reducing energy consumption has become a historical task for researchers in all walks of life. As a supporting industry for industrial development and social and economic progress, electric power occupies a very important position in the energy structure, among which coal resources consumed by thermal power generation account for about half of the total coal consumption. [0003] For thermal power generation units, under the same steam parameters, the boiler efficiency is the most critical factor affecting the coal consumption of the unit. Under the current technical level, the de...

AI Technical Summary

Problems solved by technology

However, due to the low working capacity of the rotary air preheater (the efficiency of heating condensate water is about 20%, and the heating water supply is about 50%), the waste heat utilization efficiency of flue gas is not high directly.

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