The solution to the overpressure phenomenon of the classic shell-and-shell steam boiler

The classic shell-and-shell steam boiler adopts a double-layered back-burning structure combining a water tube grate and a cast iron grate. The grate area and the heated area have a large design margin and sufficient combustion, so that the pressure is fast, the output is sufficient, and the thermal efficiency is high. It has the characteristics of small area, energy saving and environmental protection, and has fewer auxiliary machines, reliable operation and convenient installation. It has been welcomed by users for many years and has been widely used.

Overpressure of the classic shell-and-shell steam boiler

(1) The steam pressure rises sharply and exceeds the permissible working pressure. The pressure of the gauge pointer exceeds the “red line” safety valve and the pressure is still rising.

(2) When the overpressure interlock protection device is in operation, an overpressure alarm signal should be issued to stop the supply of air, air, and coal.

(3) The steam temperature increases and the steam flow decreases.

Over-pressure treatment of classic shell-and-shell steam boiler

(1) Rapidly reduce the combustion and manually open the safety valve or the bleed valve.

(2) Increase the water supply, and at the same time strengthen the sewage in the lower steam drum (this should pay attention to keep the normal water level of the boiler) to reduce the temperature of the boiler water, thus reducing the boiler drum pressure.

(3) If the safety valve fails or all pressure gauges are damaged, the furnace should be stopped urgently, and the safety valve and pressure gauge should be repaired before being boosted.

(4) When the boiler overpressures and endangers safe operation, depressurization measures should be taken, but the depressurization speed is too fast.

(5) After the boiler is over-pressure-removed, it is necessary to stop the furnace for internal and external inspection of the boiler, to eliminate deformation and leakage caused by over-pressure, and to repair unqualified safety accessories.