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Discussion on Common Problems and Solutions of Boiler
Time: 2023-08-10
boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy, electric energy, and heat energy of high temperature flue gas in the fuel. After the boiler conversion, it outputs steam, high temperature water or organic heat carrier with certain heat energy. Boiler is a kind of thermal equipment that uses the heat energy released after fuel combustion or the waste heat in industrial production to transfer to the water in the container to make the water reach the required temperature (hot water) or a certain pressure steam. It is a complete body composed of "boiler" (I. e. boiler body water pressure part), "furnace" (I. e. combustion equipment part), accessory instrument and accessory equipment.
boiler in the "pot" and "furnace" two parts at the same time, water into the boiler, in the steam system in the boiler heating surface will absorb the heat transfer water, so that the water heated into a certain temperature and pressure of hot water or steam generation, is led out of the application. In the combustion equipment part, the fuel combustion continuously releases heat, and the high-temperature flue gas generated by the combustion transfers the heat to the heating surface of the boiler through the propagation of heat, and the temperature itself gradually decreases, and then it is discharged from the chimney.
Adjustment of pulverized coal fineness. When the pulverized coal particles are too coarse, it is difficult to burn, which will increase the heat loss of mechanical incomplete combustion, and at the same time, the flame center will change and lead to slagging of the superheater. Exhaust heat loss will also increase. Coal powder over the rules consume more electricity. Therefore, the boiler should choose the appropriate fineness of pulverized coal for combustion, so that the sum of the heat loss of incomplete combustion of the machine and the power consumption is * * * * * * * The fineness of pulverized coal is such as: if the indium of pulverized coal (the particles are evenly distributed, then the large pulverized coal particles that cause the heat loss of incomplete combustion of the machine are relatively small, and it is allowed to grind coarser at this time. There is an empirical formula can be: but because the type of combustion equipment and operating conditions on the fuel burning process has a great impact, so the actual work of different burning acetylene equipment and different coal, should be through the combustion adjustment test to determine the fineness of pulverized coal. Air leakage of
system. Air leakage has a great influence on the economic operation of the boiler. Furnace air leakage to reduce the temperature of the furnace, the boiler in order to maintain a certain output must increase the amount of fuel, so that the exhaust volume increases, the exhaust temperature increases. The air leakage of the pulverizing system leads to the decrease of the system output. In order to maintain the output of the system, the ventilation volume of the primary air entering the furnace increases, the exhaust volume increases, the exhaust temperature rises, and the exhaust loss increases. Air leakage parts mostly appear at the damaged parts of the explosion-proof door on the ball mill entering a cold air door, outlet explosion-proof door, air lock and cyclone separator.
Ash and slagging. Ash and slagging of boiler heating area directly affect heat transfer efficiency. The heat after the combustion of the fuel, due to the thermal resistance is too large, the working medium can not be absorbed, will be discharged from the chimney with the high temperature flue gas. The heat loss increases significantly. At present, the following methods are mainly adopted: ① Pay attention to reasonable air distribution, the flame does not scour the water-cooled wall obliquely, and does not roll the flue; ② Superheated steam or hydraulic soot blowing (although there are many soot blower failures, it is still the main tool for * * * * * * heating area ash during boiler operation);③ Manual dredging of compressed air; ④ Manual direct cleaning when shutting down the boiler.
boiler in the "pot" and "furnace" two parts at the same time, water into the boiler, in the steam system in the boiler heating surface will absorb the heat transfer water, so that the water heated into a certain temperature and pressure of hot water or steam generation, is led out of the application. In the combustion equipment part, the fuel combustion continuously releases heat, and the high-temperature flue gas generated by the combustion transfers the heat to the heating surface of the boiler through the propagation of heat, and the temperature itself gradually decreases, and then it is discharged from the chimney.
Adjustment of pulverized coal fineness. When the pulverized coal particles are too coarse, it is difficult to burn, which will increase the heat loss of mechanical incomplete combustion, and at the same time, the flame center will change and lead to slagging of the superheater. Exhaust heat loss will also increase. Coal powder over the rules consume more electricity. Therefore, the boiler should choose the appropriate fineness of pulverized coal for combustion, so that the sum of the heat loss of incomplete combustion of the machine and the power consumption is * * * * * * * The fineness of pulverized coal is such as: if the indium of pulverized coal (the particles are evenly distributed, then the large pulverized coal particles that cause the heat loss of incomplete combustion of the machine are relatively small, and it is allowed to grind coarser at this time. There is an empirical formula can be: but because the type of combustion equipment and operating conditions on the fuel burning process has a great impact, so the actual work of different burning acetylene equipment and different coal, should be through the combustion adjustment test to determine the fineness of pulverized coal. Air leakage of
system. Air leakage has a great influence on the economic operation of the boiler. Furnace air leakage to reduce the temperature of the furnace, the boiler in order to maintain a certain output must increase the amount of fuel, so that the exhaust volume increases, the exhaust temperature increases. The air leakage of the pulverizing system leads to the decrease of the system output. In order to maintain the output of the system, the ventilation volume of the primary air entering the furnace increases, the exhaust volume increases, the exhaust temperature rises, and the exhaust loss increases. Air leakage parts mostly appear at the damaged parts of the explosion-proof door on the ball mill entering a cold air door, outlet explosion-proof door, air lock and cyclone separator.
Ash and slagging. Ash and slagging of boiler heating area directly affect heat transfer efficiency. The heat after the combustion of the fuel, due to the thermal resistance is too large, the working medium can not be absorbed, will be discharged from the chimney with the high temperature flue gas. The heat loss increases significantly. At present, the following methods are mainly adopted: ① Pay attention to reasonable air distribution, the flame does not scour the water-cooled wall obliquely, and does not roll the flue; ② Superheated steam or hydraulic soot blowing (although there are many soot blower failures, it is still the main tool for * * * * * * heating area ash during boiler operation);③ Manual dredging of compressed air; ④ Manual direct cleaning when shutting down the boiler.
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