Pressure control of industrial boiler drum
Thread Content
Discussion background: A WNS4-1.0-M boiler equipped with a biomass burner generates saturated steam at a target pressure of 0.96 MPa; the pressure switch trips at a pressure of 0.98 MPa, while the safety valve trips at a pressure of 1.04 MPa. Confusion point: Since the operating pressure of the boiler is only 0.02 MPa away from the set point of the boiler pressure switch, it is easy for the pressure switch to trigger an alarm when the load is reduced. Discussion: Please share your thoughts on how to achieve automatic load reduction control to ensure that the pressure switch does not activate in such situations
Additional note: The operating pressure is only 0.02 MPa away from the upper limit of 0.98 MPa, resulting in a narrow allowable range for fluctuations.
There’s no other way; you have to lower the steam output pressure, as the rated pressure of your boiler was set too low. At least 1.25 Mpa should be selected.
You are indeed right; it is necessary to choose a boiler with a pressure of 1.25 MPa. The problem is that it’s already a furnace with 1.0 MPa pressure.