Application of a Membrane Wall Structure in Particle Heat Exchange

Abstract

The invention discloses an application of a membrane type wall structure in particle heat changing. The membrane type wall structure comprises positive annular membrane type walls and inverted annular membrane type walls. The positive ring-shape membrane type walls and the inverted ring-shape membrane type walls all comprise first annular ducts and second annular ducts, wherein the diameter of each second annular duct is larger than that of each first annular duct. The first annular ducts of the positive annular membrane type walls are positioned over the second annular ducts of the positive ring-shape membrane type walls. The first annular ducts of the inverted annular membrane type walls are positioned under the second annular ducts of the inverted ring-shape membrane type walls. A plurality of third ducts are arranged between the first annular ducts and the second annular ducts of the positive annular membrane type wall and the inverted ring-shape membrane type wall in a communicated mode. A metal plate is seamlessly connected between enclosed-shape inner walls formed by the enclosing of each first annular duct, each second annular duct and each third duct. With the application of the membrane type wall structure in particle heat changing, the bottom material layers are disturbed by duct walls sharing a certain angle with the moving direction while particles move forward, the moving direction changes constantly, and the turbulent flow degree of the particle flowing is sharply improved.

Description

technical field [0001] The invention belongs to the technical field of particle waste heat exchange, and in particular relates to the application of a membrane wall structure in particle heat exchange. Background technique [0002] At present, the waste heat recovery of particles mostly adopts the double-layer fluidized bed heat exchange method. However, the double-layer fluidized bed heat exchange method has the following technical defects: [0003] 1) The specific heat capacity of gas is much smaller than that of solid, the amount of fluidized medium required to recover the waste heat of solid particles is huge, and the fluidized energy consumption of the heat exchanger itself is too high. [0004] 2) Since the bed temperature of the fluidized bed heat exchanger is constant, the heat transfer temperature difference between the cold and heat sources is large, the irreversible loss in the heat transfer process is large, and the efficiency of the waste heat recovery process i...

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Problems solved by technology

[0003] 1) The specific heat capacity of gas is much smaller than that of solid, the amount of fluidized medium required to recover the waste heat of solid particles is huge, and the fluidized energy consumption of the heat exchanger itself is too high

[0004] 2) Due to the constant bed temperature of the fluidized bed heat exchanger, the heat transfer temperature difference between the cold and heat sources is large, the irreversible loss in the heat transfer process is large, and the efficiency of the waste heat recovery process is low

[0005] At present, there is also a technology that uses a vibrating membrane wall to directly recover the waste heat of the particles, but there are technical defects as follows: during the forward movement of the particle layer, the mixing speed between the hot and cold particles inside the particle material layer is slow, and the mixing is not uniform enough , because the heat transfer rate of particles is lower than the heat transfer rate of mixing, so the heat transfer coefficient of the existing vibrating membrane wall particle heat exchanger is low

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