Test And Study On The Overall Plant Performance Of 350MW Gas-steam Combined Cycle Units

With the growth of the national economy and the increase of electricity demand,the construction of large-scale thermal power units has brought serious environmental pressure.Gas-steam combined cycle unit can eliminate the influence on the environment fundamentally,and have quick start and stop,high efficiency and a series of excellent cycle characteristics.Therefore,it is of great practical significance to make a systematic study the gas-steam combined cycle unit.ASME PTC 46-1996 Performance Test Code on Overall Plant Performance is especially suitable for the power enterprise to carry on the overall acceptance to the supplier guaranteed performance,it avoids the common performance guarantee of the single supplier,and the whole performance of the unit cannot reach the guarantee value.ASME PTC 46-1996 Performance Test Code on Overall Plant Performance provide a unified test methods and procedures,to determine the condensing power plant or power plant thermal performance and output power.This thesis makes an in-depth analysis of Scope of application,test principle,test execution principle,data screening method,data calculation method and other key contents of ASME PTC 46-1996 Performance Test Code on Overall Plant Performance.Taking a 2×350MW gas-steam combined cycle cogeneration unit in Beijing as an example,the 100% load performance test and the screening,calculation and analysis of the related test data are carried out in accordance with ASME PTC 46-1996 Performance Test Code on Overall Plant Performance.On the basis of ASME PTC 46-1996 Performance Test Code on Overall Plant Performance and the performance correction curve provided by Siemens gas turbine typical performance test outline,calculated the 100% load condition relative to the performance guarantee conditions of environment temperature,atmospheric pressure,environment relative humidity,gas temperature,gas low calorific value,rotation speed,gas into the air pressure loss,the average equivalent hours use,cooling water temperature,the system average leakage data deviation,the performance correction coefficient is selected based on the deviation.Revised calculated results: a 2×350 MW gas-steam combined cycle unit in Beijing and 100% load performance appraisal test unit modified electric power beyond the design value of 6.1 MW of backwardness,reduce heat loss rate 158.91 kJ/kWh,the efficiency increased by 1.53%;The test results of 100% load performance test meet the design requirements.In the light of the modified test results of the ISO operating guarantee coefficient,the calculation results showed that the electric power exceeded the design value of 6.45 mw after the modification of the ISO condition,and the thermal consumption rate decreased by 138.76 kJ/kWh.According to the test results of the guarantee coefficient of summer operating conditions,the calculation results showed that the electric power exceeded the design value of 2.09 MW during the summer working condition,and the heat consumption rate decreased by 120.61 kJ/kWh.According to the test results of winter operating condition guarantee coefficient,the calculation results show that the electric power exceeded the design value of 4.83 MW in winter working condition,and the heat consumption rate decreased by 140.42 kJ/kWh.The test results of ISO,summer and winter of gas combined cycle unit meet the design requirements.