Boiler back pressure refers to the pressure at the back end of the side combustion chamber, which is usually used to describe the pressure (greater than the local atmospheric pressure) on the outlet or secondary side of the fluid discharged from the boiler side combustion chamber.
Boiler back pressure refers to the steam that still has a certain pressure after the boiler is finished. These steam will be changed into water through the condenser and supplemented to the boiler. In other factories and mines, it will be transported to other departments for steam production and domestic bathing water. So we must ensure a certain pressure and temperature. Generally, the back pressure is between 0.5 MPa and 1 MPa. When the temperature exceeds 200 degrees, it will not return to the boiler.
Extended data:
Back pressure usually refers to the return gas pressure of the boiler. Sometimes a boiler has to bear several different reservoir temperatures. The evaporation temperature of the high-temperature reservoir is high and the evaporation temperature of the low-temperature reservoir is low. The work is based on the evaporation pressure of the low-temperature reservoir.
Therefore, the suction pressure is low. At this time, it is necessary to install a back pressure valve in the outlet pipeline of the evaporator that needs to maintain a high evaporation temperature, so that the pressure before the valve is kept within a given range, and the pressure after throttling by the valve is equal to the suction pressure, thus ensuring that each evaporator in the system operates under its own working conditions, that is, changing the high back pressure into the low back pressure. This is called back pressure regulation.
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