| The traditional method of flue-cured tobacco by coal-fired has problems of high energy consumption,low energy efficiency and serious pollution during the baking process,and has been gradually replaced by more efficient and environmentally friendly baking methods.In this paper,a new heat pump dehumidification drying system is proposed,and the flue-cured tobacco process simulation of a flue-cured tobacco cycle is taken as the research entry point.Through theoretical analysis,system simulation and comparative analysis,the performance characteristics,energy saving and operating characteristics of the system are analyzed.In this paper,the load of the densely-cured tobacco house is analyzed.It is concluded that the load of the flue-cured tobacco house is mainly divided into two parts,one part is sensible heat load and the other part is wet load.The sensible heat load is mainly composed of the heat storage of the tobacco itself,the heat load of the indoor air and the heat transfer of the outer protective structure;the moisture discharge caused by the dehydration of the tobacco leaf can be regarded as the heat of evaporation of the moisture in the air supply material through the baking cycle of the entire tobacco leaf The load calculation found that the maximum thermal load at the end of the fixed color period was 38.4 k W.On the basis of load calculation,the simulation design of each part of the system is carried out by MATLAB software,and the whole system is modeled by simulation results.The average heat pump dehumidification drying system has an average COP value of 3.82;the average unit energy consumption dehumidification is 3.97 Kg /(k W·h).Compared with the new heat pump dehumidification drying system,the drying efficiency is higher.Compared with the coal-fired baking method,the new heat pump dehumidification drying system has superior performance,which consumes 40.8%less energy than the automatic coal-fired coal-fired baking method,and consumes less energy than the manual coal-fired coal-fired baking method.55.8%.The dehumidification capacity per unit energy consumption of the new heat pump dehumidification drying system is significantly higher than that of the other two coal combustion methods.The SMER values of the automatic coal-fired baking method and the manual coal-fired baking method are only 2.19 and 1.36,respectively,and the conventional heat pump baking method has a SMER value of 3.22.The simulation results of compressor power consumption in a flue-cured tobacco cycle were analyzed,and the system operation mode in which two compressors were connected in parallel was established,one of which was a small-sized inverter compressor(0.5 to 3 k W)and the other was a medium-sized inverter compressor.(3-12 k W)When the compressor power consumption is less than 3KW,the small inverter compressor is turned on at this stage,and the medium compressor is turned off;when the compressor power consumption is more than 3k W,the medium compressor is activated at this stage,and the small compressor is turned off.According to the variation of the auxiliary heat transfer amount obtained by the simulation,the operating mode of the unit is designed in the initial heating stage,and the system adopts the heating mode;in the yellowing period and the fixed color heating period,the temperature rising and dehumidifying mode is adopted;Adopting the temperature and dehumidification mode;entering the dry gluten phase,and re-enabling the warming and dehumidifying mode to assist the heat exchange amount in the range of ± k W,the heat absorption of the indoor evaporator end of the system plus the power consumption of the compressor is approximately equal to the required supply of the flue-cured tobacco room.Heat,the system uses a pure dehumidification mode. |
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