Operation optimization of high back pressure series extraction steam heating unit under multivariate factors

Abstract

In order to study the economic changes of the high back pressure heating unit when the actual operating parameters deviates from the design value, a high back pressure heating unit in series with the extraction steam heating units is taken as an example. The effects of the high back pressure unit electric load, the heat network circulating water flow and the heat network return water temperature on the economic indicators of the high back pressure heating unit and extraction steam heating unit are analyzed. The results show that the thermal consumption is increased by about 126.95 kJ.(kW?h)−1, and gross coal consumption rate is increased by about 4.86 g.(kW?h)−1 when the electric load of the high back-pressure unit is decreased by each 5 MW. The weighted heat consumption of the heating units of is reduced by 59.62 kJ.(kW?h)−1 When the heat network circulating water flow reduced by 1500 t.h−1 and the temperature difference between inlet and return water of heat network increased by 4.8 °C.