Combined Cooling Heating And Power Cogeneration Systems Integrated With Solar Thermochemical Process And Technologies For Cascade Utilization Of Waste Heat

Focusing on the large irreversible losses in some energy conversion processes in distributed combined cooling heating and power systems, researches were carried out as follows:(1) Solar-methanol hybrid gas turbine combined cooling heating and power cogeneration systemWith a combined cooling heating and power cogeneration system integrated with solar-methanol thermochemical subsystem and waste heat power and cooling cogeneration subsystem as the research object, thermodynamic performance analysis model was established and exergy analysis and primary energy saving ratio analysis was carried out using EUD diagram and T-S diagram. The contributions to the primary energy saving ratio of the subsystems were discussed. With a combined cooling heating and power cogeneration system integrated with absorption refrigeration subsystem as the reference system, the exergy loss of chemical energy conversion process and exhaust gas heat utilization process and the primary energy saving ratio were compared. Results showed that the exergy loss of chemical energy conversion process and exhaust gas heat utilization process were reduced by 15% and 4.3%, respectively. The fossil fuel primary energy saving ratio of the system is 34.5%, which is 14.2 points higher than the reference system. The contributions of solar-methanol thermochemical subsystem and waste heat power and cooling cogeneration subsystem to the fossil fuel primary energy saving ratio were 11.7 and 17.8 points, respectively.(2) Cascade utilization of waste heat in internal combustion engine combined cooling heating and power cogeneration systemWith a combined cooling heating and power cogeneration system integrated with waste heat power and cooling cogeneration subsystem and absorption heat transformer subsystem as the research object, thermodynamic performance analysis model was established and exergy analysis and primary energy saving ratio analysis was carried out using T-S diagram. The contributions to the primary energy saving ratio of the subsystems were discussed. With a combined cooling heating and power cogeneration system integrated with absorption refrigeration subsystem as the reference system, the exergy loss of waste heat utilization process and the primary energy saving ratio were compared. Results showed the exergy loss of exhaust gas heat utilization process and jacket water heat utilization process were reduced by 5% and 57.7%, respectively. The primary energy saving ratio of the system is 17.5%, which is 3.3 points higher than the conventional reference system. The contributions of power and cooling cogeneration subsystem and absorption heat transformer subsystem to the primary energy saving ratio were 8.9 and 7.6 points, respectively.(3) System experiment platform researchSolar-methanol hybrid distributed energy system experiment verification platform was composed of solar thermochemical test bed, power and cooling cogeneration test bed, absorption heat transformer test bed and public utility supplying hot water, cooling water and power. There was also a control center in the experiment platform. The hot water and cooling water public utility were designed, established and commissioning test were carried out. The hot water utility was composed of a 100 kW heater, a 2 m3 hot water tank, a 6.3 m3/h water pump and pipeline. The hot water utility could produce hot water at about 100℃ and supply to the test beds. The cooling water utility was composed of a 60 m3/h cooling tower, two 50 m3/h water pumps, a 9 m3 cooling water tank, three 18 kW electric heaters and pipeline. The cooling water utility could produce cooling water at environment temperature and supply to the test beds. Commissioning test of the hot water and cooling water utility showed that the temperature and flow rate of hot water and cooling water could be stable for a long time.