Open Loop Absorption Heat Recovery System For Heat And Exhaust Gas Research

Absorbent heat recovery system can make full use of industrial enterprises energy consumption equipment emissions of hot and humid exhaust gas failed to rational use of waste heat,with significant economic and energy saving significance.The existing condensing flue gas waste heat recovery system has higher requirements for the recovery of waste heat medium,and it is difficult to recover the latent heat of flue gas directly in the form of indirect contact,and the recovery efficiency is not high.In this paper,a heat recovery system of open-type recirculating heat and humid exhaust gas is developed,which breaks through the limitation of the previous condensing and recycling methods.The wet heat recovery method is effectively combined with the heat pump system,and the flue gas is used as the generator to drive the heat source.The direct contact of the solution in the absorber,and in the other heat exchanger between the gas and liquid heat exchange,to achieve smoke heat sensible heat,latent heat of the progressive quality recovery.In this paper,the structure and working fluid selection of the open-circulation absorption heat recovery system are briefly introduced.The overall optimization design of the heat recovery system is studied in detail,the whole model of the system,the heat transfer and mass transfer in the absorber and the characteristics of the model.Specific work is as follows:The system is constructed by using the flue gas as the heat source of the generator heat source and the solution in the absorber.The absorber is open and the generator is closed.The natural gas combustion products with large share of water vapor as the source of flue gas,for the physical properties and economic considerations,the use of calcium chloride solution as the internal circulating fluid.A one-dimensional steady-state heat transfer and mass transfer model is established for the critical components of the system.An accurate energy balance equation is established for the two-phase continuous contact workers.The mass transfer interface equation is refined and the heat and mass exchange coefficient algorithm is refined.From the micro-angle analysis of gas,liquid heat and mass exchange process.For the solution heat exchanger,generator,condenser,gas-water heat exchanger for their respective heat transfer temperature difference calculation and model establishment,the components connected into a complete system model.The heat transfer and mass transfer characteristics and the model characteristics of the absorber are analyzed,and the model is discretized by the numerical method of the difference method.In the form of the countercurrent form of the working fluid in the absorber,the parameters of the working fluid are obtained by the iterative correction method.The temperature change curves of the three working fluid temperature and the flow density are obtained,and the temperature change is analyzed by the latent heat,sensible heat and the whole heat energy flow between the working fluids.The influence of the input parameters,the heat and mass exchange coefficient and the size of the absorber on the heat and mass exchange process are discussed,and the working characteristics of the absorber are described.The optimized design of the system is completed,and the heat transfer area of the components in the system and the design and calculation of the key nodes are completed.The objective function of the initial investment cost and the running cost is set up,that is,the unit comprehensive cost heat recovery amount Z,the constraint condition of the internal circulation variable is established,and the influence of the optimization variable on the objective function is analyzed.Based on MATLAB,the optimal design procedure is called from the genetic algorithm module,and the optimal individual value and the maximum heat recovery of the unit cost are obtained.The proposed system has significant energy saving characteristics and economic characteristics,and the conclusion can provide an important theoretical basis for the construction and debugging of the actual system.