The wind of the boiler is divided into primary wind, secondary wind, tertiary wind and other wind. The types of other winds are more complicated, such as central wind, auxiliary wind, fuel wind, burnout wind and so on.
For the pulverized coal furnace, the function of the primary air is mainly to transport the pulverized coal into the furnace through the burner, and to supply the oxygen required for the volatile matter in the pulverized coal to be ignited and burned. The role of coal preheating.
The role of the secondary air is to supply the amount of oxygen required for the complete combustion of the fuel, and to fully mix the air and fuel. Through the disturbance of the secondary air, the combustion is rapid, intense and complete.
The tertiary air is the dry air discharged from the pulverizing system, commonly known as oxygen. It is used as the medium for conveying coal powder. It is called the primary air when the powder is sent, and it is only called the tertiary air when it is sent into the furnace through a separate nozzle. The tertiary air contains a small amount of pulverized coal, and the wind speed is high, which has a strong mixing effect on the pulverized coal combustion process, and supplements the oxygen required in the burnout stage. Because of its low air temperature and high water vapor content, it can reduce the emission required for ignition and combustion. Oxygen, the primary air that uses hot air to send powder, also has the effect of preheating coal powder.
A wind:
The primary air is used to transport and heat the pulverized coal, so that the pulverized coal can be sent in through the primary air duct and can supply the oxygen needed for the volatile matter in the pulverized coal to be ignited and burned. The effect of heat. Its function is not only to maintain a certain concentration of gas-powder mixture for easy transportation, but also to provide enough oxygen for the fuel in the early stage of combustion. Primary wind can be divided into cold primary wind and hot primary wind. The hot primary air is used to ensure that the pulverized coal has a certain temperature when it enters the boiler, so as to improve the energy utilization rate. The cold primary air is used to adjust the temperature of the hot secondary air to ensure that the heat exchange rate is maximized. The pulverized coal carried by the primary air enters the furnace and then provides oxygen for combustion through the secondary air.
Secondary wind:
The secondary air is the hot air sent into the furnace through a separate channel of the burner, and gradually mixes with the primary air after entering the furnace. The secondary air provides oxygen for the combustion of carbon, and can strengthen the turbulence of the air flow, promote the return of high-temperature flue gas, promote the mixing of combustibles and oxygen, and provide conditions for complete combustion. The air volume of the secondary air is the largest among the primary air and the tertiary air, and occupies a considerable proportion in the total air volume.
Three Winds:
The tertiary air is the dry air discharged from the pulverizing system, commonly known as oxygen. It is used as the medium for conveying coal powder. It is called the primary air when the powder is sent, and it is only called the tertiary air when it is sent into the furnace through a separate nozzle. The tertiary air contains a small amount of pulverized coal and has a high wind speed, which has a strong mixing effect on the pulverized coal combustion process and supplements the oxygen required for the burnout stage. Due to its low air temperature and high water vapor content, it has the effect of reducing the furnace temperature.
Central Wind:
The role of the central wind is to increase the rigidity of the primary wind, prevent coal dust from folding and scattering, and supplement the air volume to reduce the loss of carbon incomplete combustion.
The central air is the fundamental difference between the four-channel burner and the three-channel burner. The functions of the central air: 1. Cool the end of the burner and protect the nozzle. 2. A bowl-shaped effect (inner circulation of air flow) is formed at the end of the burner to make the flame more stable. 3. Reduce the flame temperature at the end and reduce the formation of NOX harmful gas.
Auxiliary wind:
The auxiliary air control system takes the differential pressure of the secondary air bellows pressure as the adjusted variable, and the fixed value of the bellows/furnace pressure difference is taken as a function of the load
The auxiliary wind control system is a single-impulse multi-output control system, and the output of the control system simultaneously controls the auxiliary wind baffles on each floor. During operation, the loads of coal pulverizers on each floor may be different, requiring different air distribution, so each floor auxiliary damper is equipped with an operator bias station. When the oil gun is programmed to ignite, the corresponding auxiliary damper will automatically go to the "oil gun ignition" position.
Fuel wind (perimeter wind):
The fuel air (perimeter wind) control system is a ratio control system. The opening of the fuel air damper is determined by the corresponding coal feeder speed, and the fuel air damper is a function of the corresponding coal feeder speed.
Burnout Wind:
The overfire air control system is also a ratio control system, and the opening of the overfire air damper is a function of the boiler load.
The wind of the boiler is divided into primary wind, secondary wind, tertiary wind and other wind. The types of other winds are more complicated, such as central wind, auxiliary wind, fuel wind, burnout wind and so on.
For the pulverized coal furnace, the function of the primary air is mainly to transport the pulverized coal into the furnace through the burner, and to supply the oxygen required for the volatile matter in the pulverized coal to be ignited and burned. The role of coal preheating.
The role of the secondary air is to supply the amount of oxygen required for the complete combustion of the fuel, and to fully mix the air and fuel. Through the disturbance of the secondary air, the combustion is rapid, intense and complete.
The tertiary air is the dry air discharged from the pulverizing system, commonly known as oxygen. It is used as the medium for conveying coal powder. It is called the primary air when the powder is sent, and it is only called the tertiary air when it is sent into the furnace through a separate nozzle. The tertiary air contains a small amount of pulverized coal, and the wind speed is high, which has a strong mixing effect on the pulverized coal combustion process, and supplements the oxygen required in the burnout stage. Because of its low air temperature and high water vapor content, it can reduce the emission required for ignition and combustion. Oxygen, the primary air that uses hot air to send powder, also has the effect of preheating coal powder.
A wind:
The primary air is used to transport and heat the pulverized coal, so that the pulverized coal can be sent in through the primary air duct and can supply the oxygen needed for the volatile matter in the pulverized coal to be ignited and burned. The effect of heat. Its function is not only to maintain a certain concentration of gas-powder mixture for easy transportation, but also to provide enough oxygen for the fuel in the early stage of combustion. Primary wind can be divided into cold primary wind and hot primary wind. The hot primary air is used to ensure that the pulverized coal has a certain temperature when it enters the boiler, so as to improve the energy utilization rate. The cold primary air is used to adjust the temperature of the hot secondary air to ensure that the heat exchange rate is maximized. The pulverized coal carried by the primary air enters the furnace and then provides oxygen for combustion through the secondary air.
Secondary wind:
The secondary air is the hot air sent into the furnace through a separate channel of the burner, and gradually mixes with the primary air after entering the furnace. The secondary air provides oxygen for the combustion of carbon, and can strengthen the turbulence of the air flow, promote the return of high-temperature flue gas, promote the mixing of combustibles and oxygen, and provide conditions for complete combustion. The air volume of the secondary air is the largest among the primary air and the tertiary air, and occupies a considerable proportion in the total air volume.
Three Winds:
The tertiary air is the dry air discharged from the pulverizing system, commonly known as oxygen. It is used as the medium for conveying coal powder. It is called the primary air when the powder is sent, and it is only called the tertiary air when it is sent into the furnace through a separate nozzle. The tertiary air contains a small amount of pulverized coal and has a high wind speed, which has a strong mixing effect on the pulverized coal combustion process and supplements the oxygen required for the burnout stage. Due to its low air temperature and high water vapor content, it has the effect of reducing the furnace temperature.
Central Wind:
The role of the central wind is to increase the rigidity of the primary wind, prevent coal dust from folding and scattering, and supplement the air volume to reduce the loss of carbon incomplete combustion.
The central air is the fundamental difference between the four-channel burner and the three-channel burner. The functions of the central air: 1. Cool the end of the burner and protect the nozzle. 2. A bowl-shaped effect (inner circulation of air flow) is formed at the end of the burner to make the flame more stable. 3. Reduce the flame temperature at the end and reduce the formation of NOX harmful gas.
Auxiliary wind:
The auxiliary air control system takes the differential pressure of the secondary air bellows pressure as the adjusted variable, and the fixed value of the bellows/furnace pressure difference is taken as a function of the load
The auxiliary wind control system is a single-impulse multi-output control system, and the output of the control system simultaneously controls the auxiliary wind baffles on each floor. During operation, the loads of coal pulverizers on each floor may be different, requiring different air distribution, so each floor auxiliary damper is equipped with an operator bias station. When the oil gun is programmed to ignite, the corresponding auxiliary damper will automatically go to the "oil gun ignition" position.
Fuel wind (perimeter wind):
The fuel air (perimeter wind) control system is a ratio control system. The opening of the fuel air damper is determined by the corresponding coal feeder speed, and the fuel air damper is a function of the corresponding coal feeder speed.
Burnout Wind:
The overfire air control system is also a ratio control system, and the opening of the overfire air damper is a function of the boiler load.