Novel rotation stepped heat storage type air preheater

Abstract

The invention discloses a novel rotation stepped heat storage type air preheater. A center barrel, a stepped phase change heat storage rotor and the like are included. During work, the center barrel is driven by an outer drive device and rotates together with the stepped phase change heat storage rotor. Denitration smoke and air sequentially flow through a stepped phase change heat storage rotor flowing channel, and heat is transferred to air from smoke through a stepped phase change heat storage unit. Since phase change heat storage materials are adopted in the novel rotation stepped heat storage type air preheater for heat storing and releasing, the phase change temperature of each level of phase change materials is gradually reduced in the smoke flow direction, during actual running, temperature gradients cannot happen to the rotor in rotation direction, in other words, all levels of phase change energy storage units are consistent in temperature, accordingly, the rotor heat state deformation drooping volume in the rotor ring direction is the same, and favorable conditions are provided for work of a fan-shaped plate adjusting mechanism. The novel rotation stepped heat storage type air preheater has the advantages that the air leakage rate is low, drive equipment power consumption is low, rotor temperature distribution is uniform, and the heat storage capability is high; andcompared with a traditional rotation type air preheater, the heat exchange efficiency of the novel rotation stepped heat storage type air preheater is improved.

Description

technical field [0001] The invention relates to a waste heat recovery device for flue gas at the tail of a coal-fired power plant, in particular to a novel rotary cascade heat storage type air preheater. Background technique [0002] The efficiency of the heat exchanger indicates the ratio of the actual heat exchange effect of the heat exchanger to the maximum possible heat exchange effect. The number of heat transfer units (NTU) of the heat exchanger is constant, that is, when the heat exchange area, total heat transfer coefficient, and fluid volumetric heat capacity rate are constant, the efficiency of the heat exchanger increases with the increase of the volumetric heat capacity rate of the heat exchanger, so The actual heat transfer effect of the heat exchanger is enhanced with the increase of the volumetric heat capacity of the heat exchanger. [0003] The working principle of the rotary air preheater is: the flue gas of a certain temperature and the air of a certain t...

AI Technical Summary

Problems solved by technology

[0008] For the current post-SCR NH 3 and SO 3 The rotary air preheater and the downstream heat exchanger are seriously fouled and corroded, the air leakage rate is high, and the power consumption rate of the rotor drive equipment plant is high. Based on the understanding of phase change heat storage materials, the present invention provides a new Rotary cascade regenerative air preheater

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