Plate type air preheating device with adjusting function

Abstract

The invention relates to a plate type air preheating device with the adjusting function. The device comprises a plate type heat exchange assembly, a guide cover and an adjusting barrel body; the plate type heat exchange assembly is equipped with a preheating air runner and a smoke runner; the guide cover and the adjusting barrel body are respectively arranged at two ends of the smoke runner of the plate type heat exchange assembly; the guide cover is a cover body of which one end is opened, and the guide cover covers one end of the smoke runner of the plate type heat exchange assembly through the opening end; a smoke inlet and a smoke outlet are respectively formed in two ends of the adjusting barrel body; the inner part of the adjusting barrel body is divided into a smoke inlet chamber and a smoke outlet chamber through a fixed baffle plate; through holes which communicate with the smoke runner of the plate type heat exchange assembly are respectively formed in the barrel walls of the two chambers. According to the air preheating device, movable baffles can be adjusted when the operation condition is less than the design condition, and then part of the smoke is directly exhausted into the smoke outlet without flowing through a heat exchange module, so that the exhaust temperature can be kept within a stable range, and as a result, dew point corrosion can be avoided, and long-term stable running is achieved.

Description

technical field [0001] The invention relates to the technical field of heat exchange equipment, in particular to a plate-type air preheating device with an adjustment function. Background technique [0002] Heating furnaces and industrial furnaces are the main energy-consuming equipment in the production equipment of electric power and petrochemical industries, and their energy consumption accounts for about 50-70% of the total equipment. In today's increasingly scarce energy, it is undoubtedly particularly urgent to improve the efficiency of heating furnaces. Among them, reducing the exhaust gas temperature and recovering the waste heat in the flue gas are one of the main measures to improve the thermal efficiency of heating furnaces and industrial furnaces. However, the biggest obstacle to the recovery of low-temperature flue gas is the SO in the flue gas. 2 and SO 3 Dew point corrosion of acidic gases. When the temperature drops below the acid dew point, dilute sulfuri...

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Problems solved by technology

However, the biggest obstacle to the recovery of low-temperature flue gas is the SO in the flue gas. 2 and SO 3 Dew point corrosion of acidic gas

When the temperature drops below the acid dew point, dilute sulfuric acid will be produced, and heat exchangers made of existing steel types (including stainless steel) will be damaged in a short time. Precious metals such as titanium have good anti-dew point corrosion performance, but they are expensive and expensive. None as an example of an air preheater

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