| The G9512-500GFT gas generator set is used as the power system for combined cold,heat and power and the emergency peaking micro energy network.Compared with the fuel application of the diesel generator set,it has advantages in economy and emission through the application of the technology such as lean combustion,but it still faces low volumetric efficiency,large heat load and exhaust temperature in practical application.And subject to rapid loading and real-time changes in operating conditions,it puts higher demands on the applicable performance of the cooling system,and need to face the conditions of rapid loading and real-time changes in operating conditions.The performance of the cooling system is largely the key to solving the above problems.In this paper,the design and matching research of cooling system of this type gas generator is carried out to design a cooling system with intelligent control functions,and it has the dynamic cooling intensity adjustment capability under full working conditions.The design and matching of the cooling system based on the technical theory,through the two-stage experimental research and data comparison analysis on the built-up test platform which can simulate actual operating condition,the overall performance of the cooling system meets the operational requirements of each type of gas generator set.The main work completed and related conclusions are as follows:(1)Completed the design study of the cooling system control strategy,including the design of the three-level control command setting and its execution sequence control mechanism.Dynamic adjustment of cooling intensity can be achieved during the experimental study.The high temperature circulating cooling medium is basically maintained between 82℃ and 86℃,so that the unit works in a better temperature range;the low temperature circulating cooling medium temperature is stable between 32℃ and 40℃,ensuring a lower temperature of intake mixed gas.The warming up time of the cooling medium during the start-up phase of the unit is effectively shortened,and the cooling medium is kept at a higher temperature environment during the normal operation and the power reduction stage,which is beneficial to realize the economic performance of the unit.(2)Combining the problem of insufficient flow direction of the cooling medium found in the theoretical design and experimental research,the optimization research of the cooling medium flow to the tissue-assisted adjustment is completed.The optimized cooling system not only achieves the cooling strength dynamic adjustment ability to reach the design index,but also reduces the gas heat consumption rate index by about 3.5%compared with the original scheme,and reduces the unit’s emission index by about 8.0%,improve the unit operation economy and emission.(3)According to the data of mixed gas consumption,gas enthalpy and molar amount,the theoretical calculations show that the cooling capacity required for high temperature cycle and low temperature cycle at rated power is 257.9kW and 48.6kW respectively.Based on this data,the selection of main and auxiliary equipment.such as integrated fan radiator and electric circulating water pump is matched.During the test,the flow rate of the cooling medium and the temperature difference between the inlet and outlet were monitored,and the cooling capacity of the high temperature cycle and the low temperature cycle at rated power was 247.3kW and 49.2kW,respectively.The two sets of data were basically consistent,which proved accuracy of the method and results of the theoretical calculation of the cooling amount described in the paper.(4)The cooling system based on the control strategy design,cooling calculation,cooling medium flow organization design,system main and auxiliary equipment selection and matching based on intelligent dynamic adjustment function can verify therapid cooling medium temperature improvement through experimental research.The optimal temperature operating capacity ensures the economical,emission and dynamic performance of the unit under the premise of ensuring the required cooling intensity of the system;and adjusts the start/stop of the cooling fan in real time according to the required cooling intensity.Reduce the energy consumption of its own operation;The comprehensive heat utilization efficiency of gas can reach 86.8%by synthetically calculating the power generation,the heat of high temperature flue gas and the heat of high temperature circulating water. |
