Air preheater (air preheater), also referred to as air heater, is a kind of preheating equipment that improves the heat exchange performance of the boiler and reduces heat loss. The function of the air preheater is to transfer the heat carried in the flue gas discharged from the flue at the tail of the boiler to the air before entering the boiler through the radiating fins to preheat the air to a certain temperature. The air preheater rotates slowly during operation, the flue gas will enter the flue gas side of the air preheater and then be discharged, and the heat carried in the flue gas will be absorbed by the heat sink in the air preheater, and then the air preheater The heat sink rotates slowly, the radiating fin moves to the air side, and then transfers the heat to the air before entering the boiler. The application of
Air Preheater In Boiler is mostly three-division bin type, with fire alarm system, gap adjustment system and frequency conversion control system attached. The air preheater is easy to use, simple to operate, safe to operate, and can improve the heat exchange performance of the boiler system, so it is widely used in the flue gas boiler system. The air preheater is a device that collects and utilizes the waste heat of flue gas. The application of air preheater can directly reduce the temperature of boiler exhaust gas and reduce the heat energy loss in the system. At the same time, the radiating fins of the air preheater can absorb and conduct heat energy, which is equivalent to increasing the heating surface of the boiler and improving the thermal efficiency of the boiler. The air preheater has the function of heating the air required for the fuel in the boiler. The use of the air preheater can improve the combustion conditions of high-temperature air and reduce the heat loss caused by incomplete combustion of the fuel. The application of air preheater can also increase the temperature in the furnace, increase the level of radiant heat transfer and heat efficiency. The abrasion of the air preheating gas of power station boilers is mainly at the flue gas inlet 100-150mm, because the flue gas enters the heat exchange tube of the preheater After that, a vortex of flue gas is formed, and the vortex carries dust and solids to rub the tube wall. Once the tube wall is worn through, an air leak will be formed. Another problem of the tubular air preheater is low temperature corrosion. When the exhaust gas temperature of the preheater is low, a dew point will be formed, causing sulfur corrosion. The production of sulfur corrosion will not only cause the preheater to leak air, but also cause preheating. The dust of the filter is blocked. According to the actual situation of power station boilers, our company independently developed the "inner and outer enamel-coated tubular air preheater" enameled steel pipe using glass fiber reinforced plastic enamel as the body, mixed with high-temperature, corrosion-resistant, and abrasion-resistant new materials. The scientific formula is made into enamel, which is evenly coated on the inner and outer surface of the steel pipe, and then sintered at a high temperature to form a composite enamel pipe, so that the life of the preheater can reach more than 6 years, which completely solves the wear resistance and low-temperature corrosion of the steel pipe. , Because the enamel surface is smooth, it is not easy to produce dust, which reduces the blockage of the preheater. According to the actual situation, the user can choose to coat the enamel tube inside or outside.
