Ceramic heat exchange plate and air preheater

Abstract

The invention discloses a ceramic heat exchange plate and an air preheater. The ceramic heat exchange plate is integrally formed, four fin plates are arranged on the upper surface of a middle plate; two support plates and four fin plates are arranged on the lower surface of the middle plate; sealing grooves are formed in the end surfaces, the side surfaces and inner walls of the side surfaces. The internal heat exchange core body of the ceramic air preheater is assembled and formed by ceramic heat exchange plates; after being connected through a sealing frame, the ceramic heat exchange plates inside the heat exchange core body can expand in heat and shrink in cold appropriately, and a fume channel and an air channel inside the heat exchange core body cross each other and are not communicated with each other. The ceramic air preheater disclosed by the invention has the characteristics of being easy to manufacture, easy to seal and easy to assemble. The ceramic air preheater can be used in high-temperature and medium / low-temperature fume waste heat recycling, is good in air tightness, resistant to corrosion and abrasion and can be adopted to assemble a large-size air preheater. The problems that a similar air preheater is small in heat exchange area, low in heat exchange efficiency, easy to corrode, short in service life and high in gas leakage rate can be solved.

Description

technical field [0001] The invention belongs to the technical field of industrial furnaces, and relates to a ceramic heat exchange plate and an air preheater, which are applicable to flue gas waste heat recovery systems of various industrial furnaces and boilers. Background technique [0002] Heat exchangers made of ceramic materials have been used. This type of heat exchanger is generally suitable for temperatures up to 1400 ° C, and is especially suitable for waste heat recovery of high-temperature flue gas. At the same time, due to the corrosion resistance of ceramic materials, this type of heat exchanger is also suitable for waste heat recovery of low-temperature flue gas. The prior art sees the following public documents: [0003] US Patent US4681157 Cross-flow heat exchanger; [0004] US Patent US4083400 Honeycomb ceramic core for waste heat recovery device; [0005] Chinese patent ZL201010619070.7 Silicon carbide ceramic heat exchange plate and its manufacturing ...

AI Technical Summary

Problems solved by technology

[0013] Chinese patents ZL90206446, ZL94201435, and ZL200610017968 propose tube-bundle ceramic heat exchangers, all of which are built by combining ceramic heat exchange tubes with various joint bricks and refractory bricks. Due to the existence of a large number of joints, the air leakage rate is high, which affects the service life of this type of heat exchanger

"There are the following problems: 1. The complex structure brings difficulties in processing, installation and disassembly; 2. The heat transfer area is small and the heat transfer rate is low; 3. It is easy to corrode and has a low service life; The lower sealing performance is easy to fail, 5. There are many types of parts, and the labor intensity of workers is high

It cannot solve the biggest difficulty in recovering low-temperature flue gas at present, which is the problem of acid dew point corrosion. The air preheater made of ordinary steel will fail due to acid corrosion in a short period of time, which cannot meet the needs of the development of industrial furnace technology.

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