Experiment Research On RB Control Technology Of 300MW Coal-fired Power Unit

RB test is an important and comprehensive test project in the debug and production process of the coordination control system (CCS). Based on the study of the RB test in power plant, the RB test controlling strategy of #1 unit in Ningxia Zhongning generate electricity corporation has been presented in this paper. The RB control strategy can be summarized as 'dynamic control process instead of static process, internal and exterior coordination'. Based on this controlling strategy, the switch rate of pulverized coal and the action time of DEH's (the digital electro-hydraulic system) RB interfaces are adjusted by the rules of RB. According to the characteristic of large thermal inertia in boiler, the unit load and main steam pressure are drop with a fixed rate .In the RB dynamic process, it must insure that the important parameters do not exceed the limits, such as water level, furnaces pressure, steam temperature. During the procedure of feedwater pump RB, the ranges and rates of change in couciauon parameters, such as water level, feedwater quantity, steam quantity etc., are considered integratively, the quick and intelligent response of the pump rotate speed has been implemented, and the dynamic warp of water level has been well controlled. And then, base on the practical operation status of the units in Ningxia Zhongning generate electricity CO. LTD, the RB controlling logic has been designed, and thirteen experimentations (including preparation experimentation) have been carried out in #1 unit.The five items of RB test in this paper include coal mill RB, primary air fan RB, induced draft fan RB, forced draft fan RB and feedwater pump RB. In the RB tests, through the supervision, control and analysis with the important parameters (such as main steam temperature, main steam pressure, water level in drum etc.), the configuration logic has been amended and validated in time.The test results show that the four items of five items RB test are successful except feedwater pump test. In the feedwater pump RB, the parameters exceeded the limits. The RB function of coal mill, primary air fan, forced draft fan, induced draft fan can run normally. Based on the analysis of test data in the RB function test of feedwater pump and the linkage function of feedwater pump, the configuration logic has been amended, and it would be validated by the practical test if having appropriate time. A lot of practical operation parameters have been gotten in these RB tests. These...