1. Influence and control on steam temperature under 100%MCR load
At 300MW load, the deviation of both sides is generally small. When the SOFA angular SOFA1, pushed to the end, three Angle before pull what after 2, 4, tangential, can be made on both sides of the smoke temperature deviation within 15 °, superheater, reheater medium temperature deviation is smaller, A slightly high side. When 225MW load and 150MW load, the deviation is large, and after SOFA adjustment, the deviation also tends to decrease.
2、50%MCR负荷下对汽温的影响与控制 2. Influence and control on steam temperature under 50%MCR load
B/C powder making operation at 150MW load, and the upper sofa layer of the switch was used to observe the change of steam temperature when the oxygen was set at 4.9%(parameter after 30 minutes stability). It was found that the opening of sofa1 and sofa2 in sofa layer alone would increase the deviation of steam temperature, and the temperature reduction water would increase. When the sofa3 layer is opened separately, the deviation of steam temperature will be reduced. Close sofa layer auxiliary wind, open the lower damper to maintain appropriate bellows differential pressure around 300 pa after temperature can rise to about 537 (side), reheating temperatures around 528 (side), on both sides of the deviation is rising trend. Less water is added to reduce temperature.
Single set of pulverizing system running wm 150 C: main reheat steam calibrate the observation, found 150 mw coal pulverizing system of a single set of C runtime main steam temperature of about 519 degree, reheat steam temperature of 499 degrees or so in the case of stable (30 minutes) SOF layer auxiliary air door SOF3 up can relieve the reheat steam temperature of reheat steam temperature deviation but god still on the low side. In security under the premise of appropriate auxiliary air door will open SOF3 layer D D2 or D3 to powder machine layer was put into operation, improve the flame center main reheat steam temperature rise obvious main steam temperature reheat steam temperature around 527, 512 (in observation 30 minutes, rising).
According to the comprehensive analysis, it is better to close the upper sfoa layer auxiliary air door when the low-load B/C powder making system is running to increase the temperature of the main reheat steam and reduce the temperature and water amount. Under the premise of ensuring safety, the low-load single set of C pulverizing system is put into proper D layer D2/D3 feeder to improve the main reheat steam temperature obviously.