In recent years, excessive flue gas temperature often occurs in the operation of biomass boilers, resulting in a large number of waste of biomass combustion materials, such as unreasonable secondary air pressure control, excessive moisture content of biomass fuel, quality problems of biomass fuel, boiler design defects, and so on. The quality of biomass boilers is seriously affected, resulting in huge waste of energy, which is not conducive to the sustainable development of society
1 The main reason for the excessive exhaust temperature of the boiler
1.1 Secondary air pressure control is unreasonable
The boiler has a wide range of applications. In order to maximize the efficiency of the boiler, it is necessary to control the secondary air pressure according to the actual operation of the boiler, so as to ensure the sufficiency of fuel combustion in the boiler, avoid fuel waste and excessive exhaust temperature. The phenomenon that the temperature of the smoke is too high. In the actual use of the boiler, many boilers have a high exhaust gas temperature. The most important reason is that the secondary air pressure control is unreasonable, resulting in excessive combustion of the fuel in the furnace and the flame temperature in the furnace. If the temperature is too high, or because the air coefficient in the furnace is too large, the exhaust gas temperature will be too high.
1.2 Excessive moisture content of biomass fuels.
During the operation of the boiler, the moisture in the fuel in the furnace will have a certain impact on the combustion, especially in the biomass boiler. If the moisture of the biomass fuel is too high, the high-temperature steam will be generated and mixed with the burning flue gas, thus causing the excessive exhaust temperature in the boiler. In addition, due to the influence of excessive fuel moisture on flue gas temperature, will also increase the acid leakage point of flue gas, it is easy to cause corrosion to the furnace and flue gas, thus affecting the life of the boiler.
1.3 Quality problems of biomass fuels
The use of biomass boilers requires very high quality of biomass fuels. Therefore, the quality of biomass should be strictly observed during the use of biomass boilers. From a large number of practical investigations, it is found that during the operation of biomass boilers, the exhaust gas temperature is often too high, which affects the safety and reliability of boiler operation, and even affects the service life of the boiler for a long time
1.4 boiler design flaws
Biomass boilers are mainly based on burning biomass fuel, which is converted into heat energy by combustion of fuel. Biomass boilers generate a large amount of scale during combustion. Therefore, the design of biomass boilers needs to take into account the cleaning of scales. . From the current analysis of the operation of most biomass boilers, the design of biomass boilers is not reasonable enough, especially the cleaning of scales is extremely inconvenient, which leads to the formation of scale on the inner wall of the heating surface of the boiler, which affects the efficiency of boiler operation.
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