Experimental Investigation On Compressed Air Drying System Using Pressurized Liquid Desiccant And Performance Analysis Of System

Compressed air drying system based on liquid desiccant dehumidification technology is a novel method for compressed air drying. It can not only dry compressed air deeply, but also is friendly to environment and smaller in size and easier to operate, and consumes less electricity. Moreover, the regeneration process can be driven by the low-grade heat with the temperature approximately 60-80? such as the waste heat generated in air compressor, reducing the energy consumption of compressed air drying process. It is expected to be a substitute for compressed air freeze drying technology. This paper mainly presents theoretical and experimental study on the performance of the novel compressed air drying system.The operating principle of the novel compressed air drying method based on pressurized liquid desiccant dehumidifier is expounded. The experimental setup for counter-flow dehumidifier using liquid desiccant is improved to increase the air flow rate of experimental process, and the flow rate of compressed air can reach to 1.15 m/s. And the errors under the typical experimental conditions data are analyzed, and the result indicates that the maximum average relative error of the main performance parameters is within 5%. So the experimental data has high accuracy and reliability.Experiments on the experimental setup for counter-flow dehumidifier using liquid desiccant are performed to investigate the impacts of inlet parameters on dehumidifier performance and heat and mass transfer coefficients. The experimental results show that under the pressure of 0.60 MPa the compressed air moisture content can be treated to 0.1 g/kg, corresponding to the dew point temperature of -37.9?.Reliable and important data of heat and mass transfer coefficients are provided for optimum design of dehumidifier, which is also meaningful for understanding the heat and mass transfer behavior between compressed air and liquid desiccant. The theoretical analysis and experimental result are useful to verify the feasibility of the proposed method in industrial application and it also provides some reference for the optimized operation of the novel drying system.The different of drying performance and heat and mass transfer ability between LiCl and LiBr solution used in compressed air drying system is theoretical analyzed and the experimental tested. Both humidity ratio of air and moisture removal rate are emphasized to evaluate the performance of drying performance. The results indicated that the humidity ratio of air using LiCl liquid desiccant is lower and the moisture removal rate is higher than LiBr in the same experimental operating conditions. And the heat and mass transfer coefficients between compressed air and LiCl liquid desiccant is higher than LiBr. It is concluded that using LiCl liquid desiccant can obtain better drying performance and heat and mass transfer ability in compressed air drying system.The system model is establishedbased on the organic combination of all parts of system, and adopt the way of solution from the cycle running, and the system performance is simulated. The influence of different operating parameters on the performance of the system were studied; energy consumption of the system were analyzed, including solution heat consumption accounts for only about 21% of the waste heat recycled air compressor, for subsequent system's optimal operation, the implementation of part load operation control strategy and provides theory basis for late promotion.