Optimization Tests on Main Steam Pressure for 600-MW Air-Cooling Heat Supply Units

The variation of steam extraction volume and exhaust pressure with main steam pressure is studied through the tests on the 600-MW air-cooling heat supply units and the quantitative measurement on the changes of the heat consumption rate under the conditions of different extraction volumes and exhaust pressures is conducted. The year-around efficient fixed and sliding pressure operation model is put forward and the original unit sliding pressure operation logic is modified. The operation results show that a decrease of net coal consumption of 1.1 g/(kW·h) can be obtained when the sliding pressure curve is at the loads of 450 MW and the heating steam extraction is 300 t/h.