Research On Absorption Dehumidification System

Solution absorption dehumidification system, which use the low-temperature heat sources between 50°C to 80°C such as solar energy,industrial waste heat to regenerate, can remove the dust in the air,bacteria,fungi and other harmful substances, improve the air quality. From the protection of the environment and energy, it is a competitive dehumidifying technology.This paper points to the key process of solution absorption dehumidification system, the absorption,the regeneration and the whole process, does the experimental research,simulation analysis and process design. ASPEN PLUS was used to simulate the system, and according to the simulate result, pulverization spray regenerator was effective for concentrating the solution. Further, choose the packed tower as the absorber based on the analysis and comparison between the packed tower and the cooled tower.As for the absorber, the internal factors (liquid gas ratio, the concentration and temperature of the solution) and external factors (the temperature of air, humidity) on the humidity of outlet air was inspected. Experimental data showed that the device had very good performance. The changes of internal factors have greater effect on the desiccant compare to the external factors. The mathematic model of the packed tower was established, and the simulation accorded with the experimental data. The model was used to analysis the outlet parameters of the air humidity, air temperature, solution concentration and temperature varieties alongside the tower. Low temperature and high concentration of the inlet solution can strengthen the dehumidification, while for the experimental device, the best mass flow of solution to air ratio is about 3.0.As for the regeneration experiment with the pulverization spray regenerator, tested the regeneration capacity on different inlet solution temperature and air flow. Experimental data show that use the simple structure, low pressure drop pulverization spray regenerator to renew the dilute solution is totally feasible. The model of the regenerator was built to analysis the distribution of the outlet solution concentration and temperature. High inlet solution temperature can strengthen the regeneration, which was consistent to experimental data, while the inlet air temperature and humidity effects weakly.