Daily Topic (June 14)

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for determining the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the furnace going out than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, due to changes in flue gas, the negative pressure at various points in the flue also changes accordingly. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, or leakage in the heating surfaces of different sections, as well as secondary combustion incidents, can be detected in a timely manner.

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for identifying the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the furnace shutdown than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, due to changes in flue gas, the negative pressure at various points in the flue also changes accordingly. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases.

This post was last edited by boiler on 2010-6-15 08:44. 1. Check for air leaks. 2. Ventilation balance. 3. Excess air coefficient. 4. Adjust the supply and exhaust air flow based on its deviation from the target.

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for identifying the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the occurrence of a flameout than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, the negative pressure at various points in the flue changes accordingly due to variations in the flue gas volume. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, and leakage in different sections of the heating surface, or accidents like secondary combustion, can be detected in a timely manner.

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for determining the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the furnace going out than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, due to changes in flue gas, the negative pressure at various points in the flue also changes accordingly. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, or leakage in the heating surfaces of different sections, as well as secondary combustion incidents, can be detected in a timely manner.

Reply to 1# zgj2405: Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for identifying the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the occurrence of a flameout than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, the negative pressure at various points in the flue changes accordingly due to variations in the flue gas volume. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, and leakage in different sections of the heating surface, as well as accidents like secondary combustion, can be detected in a timely manner

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for identifying the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the furnace going out than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, due to changes in flue gas, the negative pressure at various points in the flue also changes accordingly. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, and leakage in different sections of the heating surface, or secondary combustion incidents, can be detected in a timely manner.

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for determining the causes of certain accidents. When combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the furnace shutdown than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, due to changes in flue gas, the negative pressure at various points in the flue also changes accordingly. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases.

Furnace negative pressure is one of the important parameters that need to be controlled and monitored during operation. Monitoring the negative pressure in the furnace is of great significance for analyzing combustion conditions and flue gas operation status, as well as for determining the causes of certain accidents. For example, when combustion inside the furnace is unstable, the flue gas pressure fluctuates, causing the pointer of the furnace negative pressure gauge to swing significantly ； When the furnace goes out, the pointer of the furnace negative pressure gauge drops rapidly to the negative side, showing a more sensitive response to the occurrence of a flameout than the water level gauge, steam pressure gauge, and flow meter. As the flue gas flows through the various convective heating surfaces, it must overcome flow resistance; therefore, the negative pressure at various points along the flue gas path increases gradually. At different loads, the negative pressure at various points in the flue changes accordingly due to variations in the flue gas volume. If the load increases, the negative pressure at various points in the flue increases accordingly; conversely, it decreases accordingly. During normal operation, the negative pressure at various points in the flue maintains a certain pattern of variation with the load ； When scaling, soot accumulation, or local blockage occurs on a certain section of the heating surface, the cross-sectional area through which the flue gas flows decreases, causing the flow velocity of the flue gas to increase and the resistance to rise. As a result, the pressure difference at its inlet and outlet increases. Therefore, by monitoring the changes in negative pressure and flue gas temperature at various points in the flue, defects such as ash accumulation, blockage, and leakage in different sections of the heating surface, or accidents like secondary combustion, can be detected in a timely manner.

During operation, if the amount of flue gas discharged from the furnace per unit time is equal to the amount of flue gas generated by fuel combustion, then the negative pressure in the furnace remains constant. When the boiler load changes, thereby affecting the air supply volume and fuel supply amount, the negative pressure in the furnace also changes accordingly. Before the boiler shuts down, the negative pressure in the furnace experiences significant fluctuations ； When there is a burst or leakage in the boiler’s heating surfaces, the negative pressure in the furnace also changes significantly. Therefore, the furnace negative pressure is an important parameter that reflects the stability of the combustion conditions and helps to identify accidents; it is necessary to monitor it closely during operation and make adjustments in a timely manner.