Study On The Liquid Desiccant Technology With Low-temperature Waste Heat

The internal combustion engine is one of the most commonly power plant used inproduction. There are many waste heat in the jacket water, but the heat is difficult to recycledue to its low grade. Generally, the waste heat was released into the environment through thefan or cooling tower. It not only wasted the heat but also caused environmental heat pollution.So it’s important to find an effective approach to use the waste heat of the internal combustionengine jacket water, to achieve the economic benefits and society benefits of the jacket water.The liquid desiccant technology is a new and environmental friendly dehumidificationtechnology, it has less demanding to the heat source, about80℃heat source can drive thesolution regeneration, so it very suitable for industrial waste heat, solar energy, geothermalenergy and other low grade energy to drive its work. Using the liquid desiccant technology torecycle the industrial waste heat is feasible, we have to research it deeply.By researching the internal combustion engine cooling system, an experimental platformof liquid desiccant driven by internal combustion engine jacket waste heat is established.Through experimental study, we obtained the influence relationship between inlet air humidity,flow rate, inlet liquid desiccant temperature, flow rate in dehumidification. When the inlet airmoisture increase from7.6g/kg (dry air) to9.4g/kg (dry air), the dehumidification increasedfrom0.27g/s to0.48g/s, after dehumidification, the temperature of the desiccant solutionincreased from2.5℃to3.6℃. When the desiccant solution temperature rise from17.5℃to27.5℃, the dehumidification decreased from0.46g/s to0.14g/s. The thermostat of the internalcombustion engine open at82℃, we start the experiment when the jacket water about85℃.The jacket hot water and the regeneration solution exchange heat in the plate heat exchanger,after this process, the regeneration solution temperature raised. When the regenerationsolution temperature is79.9℃, the dehydration capacity is1.47g/s and the regenerationefficiency is0.45. The heat consumed in the regeneration process is changing, so the cooler isessential in the system. We regulation the cooling water to keep the heat balance in the system,to avoid overheat in the internal combustion.Joining the liquid desiccant technology into the distributed energy systems can utilize thelow temperature waste heat efficiently. In addition, it can improve the energy efficiency andreduce the thermal pollution, it worthy to promote widely.