Multichannel rotating type air preheater

Abstract

The invention provides a multichannel rotating type air preheater which comprises an air preheater shell, a rotor arranged in the shell, flue gas channels, air channels and sealing plates arranged between every two adjacent channels. At least two flue gas channels are arranged, and the number of the air channels is larger than or equal to that of the flue gas channels. The air channels are formed between every two adjacent flue gas channels, that is, the flue gas channels are partitioned by the air channels. Corresponding flue gas inlet / outlet connection plates and air inlet / outlet connection plates correspond to the flue gas channels and the air channels. By means of the multichannel rotating type air preheater, hot flue gas and cold air pass through the rotor of the air preheater frequently, so that lower smoke temperature peripheral deviation and air temperature peripheral deviation are achieved, the lowest exhaust smoke temperature and the lowest rotor temperature are increased under the same exhaust smoke temperature condition, it is avoided that part of flue gas in the flue gas channels of the air preheater enters a dew point area too early, and the problems of dew formation, ash sticking, corrosion, blocking and the like of a cold-end heat storage piece are reduced. Through optimal design, the temperature of exhaust smoke of a boiler can be further lowered, and the efficiency of the boiler is improved.

Description

technical field [0001] The invention relates to a technology for heating cold air by using low-temperature hot flue gas in the tail flue of a thermal power plant, in particular to a technology for heating air by using a rotary air preheater. 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 des...

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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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