【Weekly Topic】Where should temperature measurements be installed on a boiler? What is its purpose? (7.3-7.10)

1. Water inlet line, to measure the water inlet temperature. 2. Gas-phase outlet line, for measuring the gas-phase outlet temperature. 3. Hot phase inlet line, for measuring the temperature at the hot phase inlet. 4. Hot phase outlet line, to measure the temperature at the hot phase outlet.

Reply to 1# zgj2405: 1. Temperatures of the gas at the outlet of the superheater, and at the inlet and outlet of the reheater； 　　2. Steam temperature at the outlet of each group in a superheater composed of several groups of parallel tubes ； 　　3. Steam temperature before and after the desuperheater ； 　　4. Water temperature at the outlet of the cast-iron economizer ； 　　5. Flue gas temperature at the furnace outlet of the coal powder boiler ； 　　6. Flue gas temperature at the reheater and superheater inlets ； 　　7. Temperature of the air at the outlet of the air preheater ； 　　8. Smoke temperature at the smoke exhaust location ； 　　9. Fuel temperature at the fuel inlet of the fuel boiler burner ； 　　10. Upper and lower wall temperatures of the boiler drum in boilers with a rated steam pressure of 9.8 MPa or higher ； 　　11. Metal wall temperature of the superheater and reheater coils in boilers with a rated steam pressure greater than 9.8 MPa ； 　　12. Flue gas temperature at the outlet of the air preheater of the fuel boiler. 　　Boilers equipped with superheaters should also be fitted with instruments for recording the temperature of the superheated steam.

Water supply system: Water supply temperature, whose level indicates whether the regenerative heater is functioning properly and affects the cycle efficiency. Main steam system: Superheater outlet steam temperature; it is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. Flue gas system: Air temperature at the outlet of the air preheater; monitoring this value can indicate the performance of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.

The main temperature measurement points are as follows: Water supply system: water supply temperature, the level of which indicates whether the regenerative heater is functioning properly and affects the UC desktop thermal efficiency, which in turn influences the plant’s cycle efficiency. Main steam system: Superheater outlet steam temperature; it is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. Flue gas system: Air temperature at the outlet of the air preheater; monitoring this value can indicate the performance of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.

The last edit to this post was made by zgj2405 on 2011-7-4 at 08:29. The main temperature measurement points in a circulating fluidized bed boiler system are as follows: In the deaerated water system: the water temperature at the exit of the slag cooler, the water temperature in the deaerator, and the temperature of the low-pressure steam entering the deaerator； Air system: Primary air inlet temperature, primary air secondary preheater outlet temperature, secondary air inlet temperature, secondary air secondary preheater outlet temperature, bearing temperatures of (primary air fan, secondary air fan, and exhaust fan) ； Combustion system: flue gas temperature at burner outlet, bed temperature, temperature in the dilute phase zone, temperatures in the secondary and tertiary air zones, temperature in the suspension zone of the furnace, flue gas temperature at the exit of the evaporation tubes, flue gas temperature at the exit of the high-temperature superheater, flue gas temperature at the exit of the low-temperature superheater, flue gas temperature at the exit of the high-temperature economizer, flue gas temperature at the inlet of the cyclone separator ； Flue gas system: flue gas temperature at the outlet of the cyclone separator, flue gas temperature at the inlet of the low-temperature economizer, flue gas temperature at the inlet of the primary air secondary preheater, flue gas temperature at the inlet of the secondary air secondary preheater, flue gas temperature at the inlet of the secondary air primary preheater, flue gas temperature at the inlet of the primary air primary preheater, flue gas temperature at the outlet of the tail shaft ； Steam system: temperature of water at the outlet of the low-temperature economizer, temperature of water at the outlet of the high-temperature economizer, steam temperature at the inlet of the intermediate desuperheater, steam temperature at the outlet of the intermediate desuperheater, steam temperature at the outlet of the superheater, and temperature of the steam released from the outlet of the superheater. The purpose of setting these temperature points is to monitor the operation of the boiler, ensure better maintenance of normal production, and guarantee the safety of the installation.

(1) Water supply system: Water supply temperature, the level of which reflects whether the regenerative heater is functioning properly and affects the UC desktop thermal efficiency, which in turn influences the plant’s cycle efficiency. (2) Main steam system: Superheater outlet steam temperature; it is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. (3) Flue gas and air system: The wind temperature at the outlet of the air preheater; monitoring this value can indicate the operating efficiency of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.

Temperature is one of the important indicators for the quality of steam produced by boilers, and it is also a crucial parameter for ensuring the safety of boiler equipment. Therefore, temperature monitoring is of extreme importance for ensuring the safe and economical operation of boilers, improving steam production and quality, reducing the workload on workers, and enhancing working conditions. The main temperature measurement points on the boiler are as follows: Main steam system: Superheater outlet steam temperature, which is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. Flue gas system: Air temperature at the outlet of the air preheater; monitoring this value can indicate the performance of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.

This post was last edited by dongjiang1001 on 2011-7-5 at 11:46. Reply to 1# zgj2405: Water supply system: The temperature of the water supply; its level indicates whether the regenerative heater is functioning properly, and it affects the thermal efficiency of the power plant’s cycle. Main steam system: Superheater outlet steam temperature; it is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. Flue gas system: Air temperature at the outlet of the air preheater; monitoring this value can indicate the performance of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.

Some answers seem to be off-topic, focusing only on the temperature measurement points of the boiler.

This post was last edited by dongjiang1001 on 2011-7-7 09:47. Reply to 1# zgj2405: Temperature is one of the important indicators for the quality of steam produced by boilers; it is also a crucial parameter for ensuring the safety of boiler equipment. Additionally, temperature is a key factor that affects the heat transfer process and the efficiency of the equipment. Therefore, temperature monitoring is of utmost importance for ensuring safe and economical operation, improving steam production and quality, reducing the workload on workers, and enhancing working conditions. The main temperature measurement points on the boiler are as follows: Feedwater system: feedwater temperature, whose level indicates whether the regenerative heater is functioning properly and affects the cycle thermal efficiency of the power plant. Main steam system: Superheater outlet steam temperature; it is monitored to keep the steam temperature at the specified value ； Monitoring the steam temperature at the outlet of the desuperheater is important for two reasons: firstly, to prevent this steam temperature from becoming too high, thereby ensuring that the wall temperatures of the superheater tubes in the high-temperature section do not rise excessively. It can also control the superheater outlet temperature. Secondly, this temperature can be used as a leading signal for steam temperature regulation. Flue gas system: Air temperature at the outlet of the air preheater; monitoring this value can indicate the performance of the air preheater ； Flue gas temperature is an important parameter that affects operational economy and safety. Because its level will directly affect the magnitude of smoke exhaust losses, as well as whether low-temperature corrosion and secondary combustion will occur in the rear heating surfaces ； The temperature in the high-temperature section of the superheater can be monitored to assess the combustion conditions in the furnace, such as coking or flame deviation. The flue gas temperature in the low-temperature section of the superheater can be monitored to determine the degree of ash accumulation in the superheater.