(1) **Main Steam Overpressure Automatic Protection**: When the main steam pressure exceeds the specified limit, it can affect the safe operation of wall-hung boilers, turbines, and other equipment. Therefore, when the main steam pressure exceeds the allowable value, part of the combustion equipment should automatically stop, reducing fuel supply to the furnace, or even completely shutting down.
(2) **Superheated Steam Overtemperature Automatic Protection**: High main steam temperature can damage the superheater and also affect the safe operation of the turbine or other equipment. When the main steam temperature is too high, emergency spray water should be activated or part of the combustion equipment should be stopped.
(3) **Low Oil Pressure Automatic Protection**: For oil-fired wall-hung boilers, oil pressure has a significant impact on atomization quality. Low oil pressure can severely deteriorate atomization quality, reducing combustion efficiency and potentially causing furnace explosions, rear-end re-ignition, and severe heat exchanger contamination. Therefore, when oil pressure is too low, the oil system should automatically cut off, stopping the boiler operation.
(4) **High Oil Temperature Automatic Protection**: High oil temperature is beneficial for atomization, but if the oil temperature is too high and exceeds the flash point, it may cause spontaneous combustion, leading to serious accidents. Therefore, when the oil temperature exceeds a certain allowable value, oil heating should automatically stop, and in some cases, the boiler should shut down.
(5) **Low Oil Temperature Automatic Protection**: If the fuel oil temperature is too low, the oil viscosity increases, affecting atomization quality. This not only affects combustion efficiency but also easily causes furnace explosions, rear-end re-ignition, and severe heat exchanger contamination. Therefore, if the fuel oil temperature is too low, automatic protection should be activated, and in some cases, the boiler should shut down.
(6) **Low Gas Pressure Automatic Protection**: For wall-hung boilers using gaseous fuel, low gas pressure not only affects the fuel supply and combustion but can also cause flashback. Therefore, when gas pressure is too low, automatic protection should be activated.
(7) **Low Air Pressure Automatic Protection**: Low air pressure means insufficient air volume, which affects normal combustion. Therefore, when air pressure is too low, corresponding automatic protection should be in place.
**What are the main contents of overpressure and overtemperature protection for Immergas wall-hung boilers?**
Source: Beijing Immergas Wall-Hung Boiler Repair http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3778789.