The so-called low calorific value gas refers to the gaseous fuel with lower calorific value obtained from the gasification of solid fuels such as coal or coke. The burner's fuel staged combustion technology is also called three-stage combustion technology or reburning technology. Both air and fuel are fed into the furnace in stages to form an initial combustion zone, a reburning zone and a burnout zone. When the flue gas is recirculated, a part of the low-temperature flue gas is directly sent to the combustion area, or mixed with the primary air or the secondary air and then sent to the combustion area, which not only reduces the combustion temperature, but also reduces the oxygen concentration, thereby reducing the nitrogen oxides. emission concentration. So what are the characteristics of low calorific value gas burners? The following editor will introduce.
Low calorific value gas burner features:
the
1. There are few combustible components in the gas, low calorific value, high ignition temperature, slow flame propagation speed, difficult to ignite and stable combustion;
2. The gas pressure is low and the fluctuation range is large, and it is easy to temper when the pressure is too low and the speed is too slow;
3. Most of the gas with low calorific value is the tail gas of the chemical production line, and multiple production lines need to be aggregated and comprehensively utilized, and the flow rate of the gas varies greatly;
4. The operation of the chemical process has a great influence on the composition and calorific value of the exhaust gas. The combustion process of the exhaust gas, such as the air distribution coefficient, needs to be matched and adjusted in time, otherwise it is easy to flame out.
5. According to the combustion theory, in order to ensure the stable combustion of low calorific value gas, the main stable combustion measures include optimizing the ignition conditions, increasing the flame temperature and optimizing the distribution of the combustion field.
6. Optimize the ignition conditions. Low calorific value gaseous fuels have a high ignition limit, are more difficult to ignite, and have a lower combustion temperature. To this end, it is necessary to increase the calorific value of gas and reduce the lower limit of fuel ignition.
7. Increase the flame temperature. The increase of combustion temperature can strengthen the radiation heat transfer in the furnace and improve the combustion conditions in the furnace. The actual flame temperature is related to the device type, combustion efficiency, fuel type, air/gas preheating temperature, etc.
8. Optimize the distribution of combustion field. The distribution of the combustion field includes the distribution of gas, space, and flue gas in the combustion space. The optimal distribution of the combustion field, especially the temperature field, comes from the heating of fresh gas and air by high-temperature flue gas, thereby promoting the temperature rise of air and flue gas to ignition temperature.
The above is the editor's summary of the characteristics of low calorific value gas burners. The introduction of its characteristics is because the performance of the burner plays a major role in the reliability and economy of low calorific value gas combustion equipment. Starting from the formation mechanism of nitrogen oxides, through the specially designed burner structure and by changing the air-to-coal ratio of industrial burners, the aforementioned air staging, fuel staging and flue gas recirculation can be used to reduce the concentration of nitrogen oxides in low-nitrogen combustion Technology is used in the burner to reduce the concentration of ignition oxygen as much as possible and appropriately reduce the temperature of the ignition zone to minimize the formation of nitrogen oxides. This is the main design concept of low nitrogen oxide burners at present. Another commonly used combustion technology in low nitrogen oxide burners is low nitrogen oxide swirl combustion technology.
The so-called low calorific value gas refers to the gaseous fuel with lower calorific value obtained from the gasification of solid fuels such as coal or coke. The burner's fuel staged combustion technology is also called three-stage combustion technology or reburning technology. Both air and fuel are fed into the furnace in stages to form an initial combustion zone, a reburning zone and a burnout zone. When the flue gas is recirculated, a part of the low-temperature flue gas is directly sent to the combustion area, or mixed with the primary air or the secondary air and then sent to the combustion area, which not only reduces the combustion temperature, but also reduces the oxygen concentration, thereby reducing the nitrogen oxides. emission concentration. So what are the characteristics of low calorific value gas burners? The following editor will introduce.
Low calorific value gas burner features:
the
1. There are few combustible components in the gas, low calorific value, high ignition temperature, slow flame propagation speed, difficult to ignite and stable combustion;
2. The gas pressure is low and the fluctuation range is large, and it is easy to temper when the pressure is too low and the speed is too slow;
3. Most of the gas with low calorific value is the tail gas of the chemical production line, and multiple production lines need to be aggregated and comprehensively utilized, and the flow rate of the gas varies greatly;
4. The operation of the chemical process has a great influence on the composition and calorific value of the exhaust gas. The combustion process of the exhaust gas, such as the air distribution coefficient, needs to be matched and adjusted in time, otherwise it is easy to flame out.
5. According to the combustion theory, in order to ensure the stable combustion of low calorific value gas, the main stable combustion measures include optimizing the ignition conditions, increasing the flame temperature and optimizing the distribution of the combustion field.
6. Optimize the ignition conditions. Low calorific value gaseous fuels have a high ignition limit, are more difficult to ignite, and have a lower combustion temperature. To this end, it is necessary to increase the calorific value of gas and reduce the lower limit of fuel ignition.
7. Increase the flame temperature. The increase of combustion temperature can strengthen the radiation heat transfer in the furnace and improve the combustion conditions in the furnace. The actual flame temperature is related to the device type, combustion efficiency, fuel type, air/gas preheating temperature, etc.
8. Optimize the distribution of combustion field. The distribution of the combustion field includes the distribution of gas, space, and flue gas in the combustion space. The optimal distribution of the combustion field, especially the temperature field, comes from the heating of fresh gas and air by high-temperature flue gas, thereby promoting the temperature rise of air and flue gas to ignition temperature.
The above is the editor's summary of the characteristics of low calorific value gas burners. The introduction of its characteristics is because the performance of the burner plays a major role in the reliability and economy of low calorific value gas combustion equipment. Starting from the formation mechanism of nitrogen oxides, through the specially designed burner structure and by changing the air-to-coal ratio of industrial burners, the aforementioned air staging, fuel staging and flue gas recirculation can be used to reduce the concentration of nitrogen oxides in low-nitrogen combustion Technology is used in the burner to reduce the concentration of ignition oxygen as much as possible and appropriately reduce the temperature of the ignition zone to minimize the formation of nitrogen oxides. This is the main design concept of low nitrogen oxide burners at present. Another commonly used combustion technology in low nitrogen oxide burners is low nitrogen oxide swirl combustion technology.