What is the Difference between Continous and 善uff・Blow-down?
All boilers have blow-down connections located at low points where sludge is likely to collect. Operning these blow-down valves periodically for shot intervals gives a 叢uff・or intermittent removal of sludge and conctrated solids. Many boil-ers also have vlow-down connections consisting of an offtake located just below the water level in the steam release area. A small amount of water is continously removed through these con-nections. The use of continous blow-down in addition to 叢uff・or bottom blow-down kes it possible to maintain the solids and chemical residuals at more consistent levels in the boiler water. Continous blow-down also minimizes the amount of blo-down re-quired with resultant savings in heat and chemicals. Continous blow-down also causes less upset in boiler water circulation and operation.
