Integrated Mechanism And Method Of Air Dehumidification And Marine Aerosol Removal Driven By Heat Source

Tropical marine atmosphere is characterized by high temperature,high humidity and containing marine aerosols.On the one hand,these characteristics make the living comfort of islands and ships worse.On the other hand,they aggravates the corrosion of equipment and materials.In addition,the traffic restriction makes energy and resources particularly valuable,and the traditional fresh air treatment technologies relying on power and consumables become no longer economical.Based on the above situation,this paper focuses on the integration of air dehumidification and marine aerosol removal from the perspective of low-grade waste heat utilization,and carries out the mechanism and experimental research on the integration of low-temperature heat driven air dehumidification and desalination from four aspects:mechanism and method of air dehumidification and marine aerosol removal integration,experimental verification of key processes,design and test of principle prototype,system integration and technical verification based on integration technology.Based on the synergistic mechanism of liquid desiccant dehumidification and wet scrubbing separation,as well as the phase transition separation characteristics of mixed working fluids based on the same ion effect,the integrated idea of air dehumidification and marine aerosol removal driven by heat source is proposed.The principles of water and marine aerosol integrated absorption process and working fluid regeneration process are analyzed and discussed.Then,from the perspective of system functionality and comprehensive performance,this paper analyzes the performance of the working fluid according to the corresponding physical properties,and gives the weight of evaluation indexes and the score of the working fluid to select the optimal working fluid for the integrated process.Under the guidance of the integration mechanism,this paper further proposes the integration method of heat driven air dehumidification and marine aerosol removal,and establishes a typical heat driven integration process composed of dehumidification and marine aerosol removal process,water separation process,salt separation process and water-salt balance process.After that,the steady-state thermodynamic model is established,and the performance of the system under typical conditions,the influence of operating parameters on the heat and mass transfer process,and the influence of key design parameters on the system performance are studied.It is found that the maximum cycle time of the salt separation process is affected by the crystallization temperature,and its average energy consumption is two orders of magnitude lower than the heat consumption of the system,so the energy consumption of the salt separation process can be ignored.In order to further verify the feasibility of dehumidification and marine aerosol removal process and further explore its performance,this paper designs and builds an experimental platform of absorption dehumidification and marine aerosol removal process,and carries out experimental research to verify the feasibility of the integration technology route of dehumidification and marine aerosol removal.In order to obtain the concentration of the marine aerosol conveniently,a method of measuring marine aerosol concentration based on conductivity measurement is proposed,and the feasibility of this method is verified by experiments.The preliminary experimental results show that under the condition of no external cold source introduction,the comprehensive marine aerosol removal efficiency can reach 82.3%with dehumidification synergy.In addition,the feasibility of the key functional process(salt separation process)proposed above has been verified with small-scale experiments.Since then,this paper has realized the technical verification of the whole chain of the air dehumidification and marine aerosol removal integration process,which provides technical support for the development of the prototype and the design of the technical verification system.Under the guidance of the integrated mechanism and method,the air dehumidification and marine aerosol removal integrated prototype was developed in this paper.According to the actual demands of user,the process and thermodynamic parameters design of prototype,the structure and process design of components and the whole prototype are carried out.The test platform is designed and built,which are composed of marine atmospheric simulation system,dehumidification and desalination integrated principle prototype,cooling and heat source system,and centralized control measurement and data acquisition system.The key process performance,overall thermodynamic performance,parameters control stability,and continuous operation stability of the prototype are tested.The results show that the supply air parameters of the prototype change little with the fresh air parameters changing,so the stability of the control system has been verified.The fresh air temperature,relative humidity and supply air temperature can affect the energy efficiency of the prototype.The comprehensive marine aerosol removal efficiency of the prototype reaches 73.6%,and the removal effect is better under low air volume.The basic functions of the salt separation module can be successfully realized.The low content of LiCl in the separated crystals indicates that the effect of salt separation process is remarkable.Based on the integrated technology of air dehumidification and marine aerosol removal driven by heat source,this paper further studies the system combination of the integrated method.A multifunctional air treatment system driven by low temperature heat source is proposed.Through the deep utilization of low-grade heat source,the system realizes the collaborative treatment of air cooling,dehumidification and marine aerosol removal.On this basis,this paper further evaluates the system characteristics from the aspects of system performance,parameter sensitivity and system economic analysis,which provide guidance for the design of technical verification system.On this basis,an electric cooling and dehumidification system is designed for an industrial building in an island environment with tropical marine climate.The total cooling capacity is 333.7 kW,and the primary energy utilization rate can reach 74.7%.The energy products can meet the actual needs of users.Further,the main equipment is selected,and the test system of refrigeration dehumidification and marine aerosol removal driven by waste heat is designed and built.The actual performance and joint operation stability of the main equipment in the system were tested in the marine atmospheric environment.The results show that the steady-state and dynamic performance of the main equipment,as well as the joint operation stability of the system meet the design requirements.The system realizes the verification of refrigeration,dehumidification and marine aerosol removal technology driven by heat source,which is based on the integrated method proposed in this paper.