Self-cleaning fluidized bed heat exchanger

Abstract

The invention relates to a self-cleaning fluidized bed heat exchanger, which comprises a cylinder body and a heat exchange tube, wherein a gas inlet and a gas outlet are arranged on the cylinder body; a gas pre-distribution plate which is provided with a plurality of through holes are arranged in the cylinder body and are positioned between the gas inlet and the gas outlet; a macroparticle bed which consists of a plurality of macroparticles is supported on the gas pre-distribution plate; the macroparticles are in a bubbling fluidized state when the gas passes through the cylinder body at a working flow speed; and one part of the heat exchange tube is embedded in the macroparticle bed. The macroparticles improve multiply the heat transfer coefficient of the gas side of the heat exchange tube during transferring the heat in the gas to the heat exchange tube; and the collision of the macroparticles clean dust which is adhered to the wall surface of the gas side of the heat exchange tube. The self-cleaning fluidized bed heat exchanger is applied to explosive gases such as various dusty gases or coal gas and the like. The invention has the advantages of safety, easy dust cleaning, low cost and the like.

Description

technical field [0001] The invention relates to heat exchange equipment, in particular to a heat exchanger used for recovering heat energy of explosive gas such as dust-laden flue gas or coal gas. Background technique [0002] Various forms of heat exchange equipment have been widely used in various fields of production and life. Among the many types of heat exchange equipment, some are cheap, but have poor heat exchange effect; some have high heat exchange efficiency, but are complicated to manufacture and expensive. When the gas contains dust, the problem becomes more complicated, because the dust will block the heat exchange equipment and deteriorate the heat exchange; what's more, the heat exchange tube will be worn out, causing serious accidents such as shutdown. [0003] In addition, the flue gas or coal gas contains dust, even after dust removal, the dust concentration may reach 30mg / m 3 above. Although this dust concentration can meet the environmental protection ...

AI Technical Summary

Problems solved by technology

Installing fins or ribbed tubes on the gas side is a common way to improve the heat transfer effect of the gas side, but the focus is to enhance the heat transfer effect by increasing the heat transfer surface area, and there is still no breakthrough in the convective heat transfer coefficient of the gas side, and As the use time increases, it is common to accumulate dust on the surface of the fins, and the heat transfer effect decreases with time

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