Waste heat boiler is an important energy-saving equipment. Due to the diversity of "waste heat" types, the structure of waste heat boiler is various and different. For example, the exhaust gas temperature of various smelting furnaces and roasting kilns is 650~1250 ℃; The exhaust temperature of power machinery such as gas turbine and diesel engine is 370-540 ℃. Installing a waste heat boiler to absorb part of the heat in these exhaust gases can significantly increase the heat utilization rate of the whole system. For example, after installing the waste heat boiler in the steel rolling heating furnace, the heat energy utilization rate of the whole system can even be doubled.

Denitration waste heat boiler The flue gas temperature entering the waste heat boiler is an important factor that determines the layout of the heating surface of the waste heat boiler. For example, when the inlet flue gas temperature is 400~900 ℃, the convection tube bundle is mainly set in the boiler, and the furnace chamber is not set; However, there are exceptions when the melting point is low. A cooling furnace room should be set to control the temperature of the inlet smoke entering the convection flue, so as to avoid the ash bridging between the convection tube banks.

The connection between the corrosion of waste heat boiler and water quality is, on the one hand, affected by the ph value of water, and the degree of influence is not small. There is a kind of magnetic oxide film, which is produced on the metal surface when the waste heat boiler works. This layer of magnetic oxide film can effectively corrode the iron of the waste heat boiler itself. When the ph value of the water in the boiler is not kept in the alkaline state, hydrogen depolarization will occur when the ph value is less than 7, which means that its corrosion degree will be very - --, similarly, the smaller the acidity, the more serious the corrosion degree of the waste heat boiler. However, the pH value should not be too high. When it exceeds 12, it will show strong alkalinity. The heat pipe waste heat boiler will suffer from alkaline corrosion under high temperature.

In the cracking process of chemical production, Denitration waste heat boiler For water quality, in order to avoid the re polymerization of high-temperature pyrolysis gas and denitration of waste heat boiler, it is necessary to rapidly cool the high-temperature pyrolysis gas to the temperature where the cracking reaction stops. At this time, the waste heat boiler becomes an indispensable quenching process equipment.