辐射能作为热量信号的过热蒸汽温度控制

传统的锅炉过热蒸汽温度控制系统通过检测过热蒸汽温度及其变化趋势来调节减温水量．从而维持过热蒸汽温度在允许的范围之内。由于过热蒸汽温度在减温水量扰动下延迟较大，这种特性使过热蒸汽温度的控制滞后，控制效果不理想。鉴于锅炉总辐射能信号充分体现了锅炉内燃烧工况的变化，能提前反映烟道进口烟温变化趋势，为此，在过热蒸汽温度控制系统中引入了锅炉总辐射能信号，通过检测烟气温度及其变化趋势来提前调节减温水量，从而改善主蒸汽温度调节的品质。经在广东省沙角A电厂5号机组（300MW）上进行了定负荷与变负荷工况下的调节试验，调节效果理想。

Superheated steam temperature control with radiant energy as calorific value signal

Traditional control system for boiler superheated steam temperature regulates desuperheating water flow through testing the superheated steam temperature and its variation trend,thus keeping the temperature of superheated steam within a permissible range.The considerable delay in change of superheated steam temperature with respect to disturbance of desuperheating water flow,however,leads to the lagging in superheated steam temperature control and as a result the control effect is not satisfying.On account of the fact that the signal of total boiler radiant energy fully embodies the changes of combustion conditions in a boiler and can foreshow the variation trend of inlet flue gas temperature,the signal of total boiler radiant energy is introduced in the control system for superheated steam temperature.Desuperheating water flow is regulated in advance through testing the flue gas temperature and its variation trend,so as to improve the control on main steam temperature.With this method,regulation tests were made on Unit 5(300 MW) in Shajiao A Power Station at constant and varying loads and the results were satisfactory.