Protect the water level.
The steam boiler is equipped with two pumps for operation and backup.
The plate water level gauges of one or two boilers should be often compared with each other, and if the indications are inconsistent, they should be corrected immediately. Each shift flushes the level to determine its true water level. And an electrode type water level balancing cylinder, can accurately collect water level signal, alarm or pump control.
Protect the pressure.
Vapor pressure protection device.
When the boiler pressure exceeds the rated value, the chain protection measures should be adopted: that is, the furnace is stopped, the high-pressure boiler tube combustion system stops working, the furnace opening can be changed, the single or double stage combustion can be adjusted, and the oil amount can be adjusted to reduce the pressure and ensure the safe operation of the boiler.
Fuel (gas) steam boiler pressure protection is the same as water level protection, with multiple protection:
Air pressure controller
Two pressure controllers are usually used, one is an electromechanical conversion device, which converts the pressure signal into an electrical signal, and the function of the 20G high-pressure boiler tube is to give the signal of different pressures to the electrical switch, and one is to automatically control or interlock protection of the external line.
Ordinary pressure gauge and contactor pressure gauge are cut off the burner when the steam pressure reaches the limit, and the pressure controller adjusts the single fire or double fire combustion according to the actual operating pressure; For large burners, the amount of fuel can be adjusted according to the pressure level, and the pressure is always stable.