detailed description

Gas fuel hot air stoves are divided into two types: direct combustion and indirect combustion.

Direct high purification hot blast stove

It is to use fuel for direct combustion, undergo high purification treatment to form hot air, and directly contact with the material for heating, drying or baking. This method reduces fuel consumption by about half compared to using steam or other indirect heaters. Therefore, without affecting the quality of the dried products, it is entirely possible to use direct high purification hot air.
The fuel is gaseous fuel, such as coal gas, natural gas, and liquid gas.
The high-temperature combustion gas obtained from the combustion reaction of the fuel further comes into contact with the outside air, mixes to a certain temperature, and directly enters the drying chamber or baking room, where it comes into contact with the dried material, heats and evaporates water, thereby obtaining the dried product. In order to utilize the combustion reaction heat of these fuels, it is necessary to install a fuel combustion device. For example: gas burner

Indirect hot blast stove

Mainly suitable for drying materials that are not allowed to be contaminated, or for drying thermosensitive materials at lower temperatures. Such as milk powder, pharmaceuticals, synthetic resins, fine chemicals, etc. This heating device uses steam, thermal oil, flue gas, and other carriers to heat the air through various forms of heat exchangers.
The 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 life of the furnace body and heat exchanger. On the contrary, the size of 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.