The utility model relates to a plate type air preheater, which is a heat exchanger which is suitable for steam and is suitable for hot water or high-temperature heat conduction oil to heat the air. Air heating and cooling is widely used in chemical industry, textile, machinery, chemical, food, pharmaceutical, metallurgy, rubber, paint, leather, plastic and wood drying process. A large number of industrial emissions of hot gas, flue gas, that is a waste of energy; the pollution of the environment, waste heat recovery heat exchanger used to extract heat from the waste gas emissions, to produce hot air, hot water or hot oil return for industrial production, in order to achieve high efficiency, energy saving and environmental protection purposes.

Tube type air preheater is widely used in our country. The utility model is composed of a plurality of steel pipes which are arranged in parallel rows, and the two ends of the tube are welded with the tube plate to form a cube pipe box with a certain heating surface.

The characteristics of tube type air heater are: high heat transfer efficiency, simple structure, easy manufacture and processing, less theoretical air leakage, good tightness and less wear. Therefore, it has been widely used in oil, chemical, metallurgy, electric power, environmental protection and other industries.