Design Of Inlet Air Cooling System Based On Absorption Refrigeration Driven By Waste Heat From Gas Turbine

With the development of economy, the energy and environment issue becomes prominent increasingly. For gas pressure station located in the desert area, energy becomes very valuable, so the importance of the efficient use of energy is on the agenda. As a kind of common gas turbine energy efficient utilization strategy, the inlet air cooling technology effectively corrects the effect of environmental temperature on the gas turbine performance and has attracted attention greatly. At the same time, most of the gas turbine power plant has reached a high level of heat utilization degree, so that future efficiency can only rely on waste heat utilization. Thus low grade exhaust waste heat utilization development potential to be reckoned with.Absorption refrigeration technology combines the both above, using the waste heat of gas turbine exhaust as driving force making cold quantity that can be used for inlet air cooling. It utilizes the waste heat to cool the inlet air and improves the efficiency of gas turbine. At present, the absorption coo ling technology has been successfully applied to the gas turbine inlet air cooling field. Compared with evaporative cooling, absorption cooling has obvious advantages in the use of waste heat. Absorption chiller only needs tenth of the energy of steam compression machine to be put to work. It has advantages such as environmentally friendly, of no noise, easily integrated with the existing gas turbine equipment. Therefore, it will get more and more attention and application.A set of gas turbine waste heat absorption refrigerating inlet air cooling system was designed for gas pressure station located in the desert. Due to the complicity of the load calculation process, software specially designed for load calculation of the absorption R124-DMAC refrigeration system to simplify the calculation is necessary. Different kinds of conditions of cyclic therrnodynamic parameters can be calculated by the software. The design of the software paved the way for the heat exchanger design, type selection and multi-working condition monitoring. In addition, the thermal design of four main heat exchangers including evaporator, condenser, absorber and generator were finished based on the condition of gas pressure station, with different configuration proposed to satisfy different heat exchange requirements. By means of theoretical estimation, the system reaches a COP of 0.528 and successfully improves the output and mass of inlet air by 20% and 10% respectively.