Patent ID: 6520122
Filing Date: 2003-02-18
Classification: F22B,F22D

Abstract:
A method of controlling the operation of a pressurised steam boiler heated by a burner, the method including the following steps;a) monitoring the level of water in the boiler, b) monitoring the pressure of steam in the boiler, c) monitoring the firing rate of the burner, and d) controlling the flow rate of water into the boiler having regard to the signals resulting from a) and b) and, at least for some signal conditions, also having regard to signals resulting from c), in which when i) the monitoring of the level of water in the boiler shows a rate of increase above a predetermined level, ii) the monitoring of the pressure of steam in the boiler shows a reduction in pressure at a rate above a predetermined level, and iii) the monitoring of the firing rate of the burner shows that the firing rate is increasing at a rate above a predetermined level, the controlling of the flow rate of water into the boiler is such that it does not necessarily reduce the rate of flow into the boiler.