How does a boiler control steam pressure? !
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Boilers are classified into high, medium, and low pressure. How is the steam pressure controlled in a boiler? Water level? Outlet valve opening? Or something else? ! Thank you. . . . . . .
Under normal circumstances, the steam pressure is controlled by the amount of steam emitted from the boiler.
The steam pressure in the main boiler pipe is an important indicator for the operation of the boiler, with the goal of maintaining stable steam pressure under different steam demand conditions. The steam pressure in the main boiler pipe is controlled by the fuel amount and air-fuel ratio. At the same time, it is necessary to maintain stable liquid levels in the boiler drum, stable negative pressure in the furnace, and stable residual air amount in the flue gases. Boiler control is not just a single issue of steam pressure control.
“\"Through fuel quantity and air-fuel ratio control\" – this merely controls the heat input. What emerges from the water surface is saturated steam, and I want to know how the saturation pressure of this steam is controlled. For example, if I want saturated steam at 0.6 Mpa, how do I achieve that? !
Pressure adjustment for the steam being sent outside definitely requires an automatic pressure control valve for regulation! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
This is generally controlled by the pressure of steam; actually, this issue is quite complex. Wait a while – professional thermal engineering experts will help you figure it out
If the steam pressure is slightly higher, the valve element of this control valve will be quickly eroded and damaged.
In other words, the pressure in the steam space is controlled through the outlet valve, in order to regulate the saturated steam pressure.
We still have to wait for the thermal engineering expert. Is it that complicated? ! ～
Above the boiler water level is the saturated steam space, and it is the pressure in this space that determines the pressure of the saturated steam, right? ! Or is it controlled through heat (temperature)? !
If the heating load is sufficient, the temperature is reached, and there is water present, then saturated steam is produced. All of these have been calculated based on thermal balance design. There is no need to set outlet steam pressure reduction. Even if it is set, if the downstream users do not require that much capacity and the heating load of the boiler remains unchanged, overpressure will still occur; in such cases, it is necessary to vent the excess pressure (or reduce the pressure and send it to users at other pressure levels). Heating load is the primary method.