Plate type air preheater with glass as heat exchange plate

Abstract

The invention provides a plate type air preheater with glasses as heat exchange plates, belonging to the technical field of heat exchangers. The plate type air preheater comprises an air preheater frame, the air preheater frame comprises an upper cover plate (10), a lower bottom plate (11) and a stand column (5) and is internally provided with a plurality of heat exchange plates (1) which are correspondingly placed in vertical direction; a sealing strip (4) is arranged between every two heat exchange plates (1) which are adjacent in vertical direction; the sealing strips (4) are mutually staggered at 90 degrees and form a plurality of sealing fluid channels which are adjacent and mutually staggered at 90 degrees by being placed in a staggered way so as to respectively form hot fluid channels and cold fluid channels; rectangular glass plates are adopted as the heat exchange plates (1), and the glass can be silicon-boron glass and boron-free low-alkali glass or quartz glass; and supporting strips (2) which are rectangular or S-shaped nonmetal plate bars are arranged among the fluid channels formed by the upper and lower heat exchange plates (1). The invention has dew point corrosionresistance, efficiently recovers the low-temperature exhaust heat of smoke and can reduce the temperature of discharged smoke and enhance the efficiency of a heating furnace.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers, and discloses a plate type air preheater whose heat exchange plates are glass. Background technique [0002] Heating furnaces and industrial boilers are the main energy-consuming equipment of production equipment in the electric power and petrochemical industries, and their energy consumption accounts for about 50-70% of the total energy consumption of the equipment. In today's increasingly scarce energy, it is undoubtedly particularly urgent to improve the efficiency of heating furnaces. One of the main measures to improve the thermal efficiency of boilers and industrial furnaces is to reduce the exhaust gas temperature and recover the waste heat in the flue gas. Reducing the exhaust gas temperature and recovering the waste heat in the flue gas are the most important technical measures to improve the efficiency of heating furnaces and industrial furnaces. However, so far, the biggest ob...

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Problems solved by technology

However, so far, the biggest obstacle to the recovery of low-temperature flue gas is the SO 2 and SO 3 When the temperature drops below the acid dew point, dilute sulfuric acid will be produced. Heat exchangers made of existing steel types (including stainless steel) will cause damage in a short time. Precious metals such as titanium have good dew point corrosion resistance, but Expensive, no examples as an air preheater

Flue gas low temperature dew point corrosion has become a technical problem limiting the reduction of exhaust gas temperature

In order to avoid the dew point temperature, the exhaust gas temperature of the existing technology is as high as 170 ° C ~ 180 ° C, which greatly causes a waste of energy. With the continuous rise of energy prices, there is an increasing need for an efficient use of flue gas Waste heat, a new type of equipment that further reduces the exhaust gas temperature

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