Direct high purification gas-fired hot blast stove uses fuel to burn directly, forms hot blast after high purification treatment, and directly contacts materials for heating, drying or baking. The fuel consumption of this method is about half that of steam or other indirect heaters. Therefore, direct high purification hot air can be used without affecting the quality of drying products.

   The fuel is gaseous fuel, such as gas, natural gas and liquid gas. The high-temperature combustion gas obtained from the combustion reaction of the fuel further contacts with the external air, and after mixing to a certain temperature, it directly enters the drying chamber or baking room, contacts with the dried material, heats and evaporates water, so as to obtain the dried product.

   In order to utilize the combustion reaction heat of these fuels, a set of fuel combustion device must be added. For example: gas burner 2. Indirect gas hot blast stove is mainly suitable for drying materials that are not allowed to be polluted, or for drying heat sensitive materials with low temperature. Such as milk powder, pharmacy, synthetic resin, fine chemical industry, etc. The heating device uses steam, heat transfer oil and flue gas as carriers to heat air through various forms of heat exchangers.

   The most essential problem of indirect hot blast stove is heat exchange. The larger the heat exchange area, the higher the heat conversion rate, the better the energy-saving effect of the hot blast stove, and the longer the service life of the furnace body and heat exchanger. On the contrary, the heat exchange area can also be identified from the flue gas temperature. The lower the smoke temperature, the higher the heat conversion rate and the larger the heat exchange area.