| In recent years, the whole society’s demand for energy continues to increase, and continuous high speed development has caused a big damage to the environment. Therefore, the government has launched a series of energy conservation and emissions reduction plan, in order to reduce pollution and improve energy efficiency. In paper making, dyeing and finishing, power generation and other industrial production field, the hot wet flue gas of high moisture content could be produced. Due to the waste gas containing a large number of the latent heat of vaporization, direct emissions will cause huge energy waste, so it is necessary to carry out its heat recovery processing. Compared with the traditional way of recuperative heat recovery, heat pump system can not only improve heat recovery temperature, but also can improve the efficiency of hot wet flue gas heat recovery, which is an efficient way of heat recovery. To this end, following research has been carried out:(1) Aimed at the specialties of the hot wet gases latent heat recovery, this paper proposes an open adiabatic absorption heat pump system with the combination of liquid desiccant technology, heat pump technology and the concept of thermal mass separation. The system has the following advantages:compared with the closed absorption heat pump, the overall structure of the open absorption heat pump is simple and the absorber works under ordinary pressure which is more convenient. Compared with the method of recuperative heat transfer, direct contact between waste gas and absorbents can promote the water vapor condensation in the exhaust, and release the latent heat of vaporization. And adopting the method of adiabatic absorption can improve the heated water output temperature of the system.(2)The theoretical model of the open adiabatic absorption heat pump system was structured and the thermal performance of the system has been analyzed. The influence of generating temperature, absorber dehumidification efficiency, liquid-gas ratio on the COP of the system, the heated water output temperature and the system output heat load has been investigated.(3) The experimental study has been carried out on the adiabatic packed tower, the key component of the open adiabatic absorption heat pump system. The experiment device of the adiabatic packing tower absorber has been set and lithium bromide aqueous solution was used as the absorbent. The adiabatic absorption properties were studied under high moisture content conditions. The influence of the wet air inlet humidity ratio, solution inlet temperature, solution import quality score, liquid gas ratio and the air volume on the performance of the absorber, including dehumidification efficiency, mass transfer coefficient and temperature lift, was mainly studied.(4)The influence of the external parameters, including wet air inlet temperature, wet air inlet humidity ratio, and condensing temperature, on the performance of the adiabatic open absorption heat pump, has been analyzed. Then, the method of adjusting operation parameters to meet the demand side parameters and the characteristics of the two kinds of heated water process were discussed. |
