Research On Configuration And Applicability Of Hybrid Absorption Refrigeration Units Based On Residual Heat Utilization

Energy conservation plays an irreplaceable role in the increasingly tense energy situation in China,and it has inestimable effects on alleviating the environmental pollution brought about by industrial development.Industrial waste heat recovery plays an important role in energy conservation and emission reduction.Although China's industrial waste heat resources are abundant,the recycling efficiency is low.Therefore,this paper takes industrial waste heat utilization as the research object,focuses on the configuration optimization of hybrid absorption refrigeration units,and starts the research on the configuration optimization of hybrid absorption refrigeration units based on the utilization of waste heat resources.This paper focuses on the analysis of the flue gas waste heat resources theoretically,and the analysis shows that there is great potential for waste heat.Using the DeST software to simulate the air conditioning cooling load and the chilled water distribution system of the data center room throughout the year.The cold load rate of above 82%,therefore,compared to the cooling load of the general building,the change in the cooling load throughout the year is relatively stable,and it is required to provide cooling throughout the year.Based on the data center cooling load,with"minimum steam consumption"and"minimum total annual cost"as the objective function,with"one by one method"and"minimum steam consumption as targets"are used as the operation control strategy for the optimization of the unit configuration scheme,where,the optimization control strategy of"the minimum steam consumption is the target"uses sequential quadratic programming(SQP)and simulation calculations using MATLAB:9 steam-type absorption bromine generators with a capacity of 6500 kW is the optimal unit configuration.The"minimum steam consumption target"operation control strategy is the most energy-efficient.According to the optimal configuration of pure steam absorption chillers identified,based on the recovered waste heat of the flue gas,the hybrid absorption chiller is considered for cooling the data center.According to the configuration combination:there are a total of 10 hybrid unit configurations.Then using the SQP method to obtain the optimal number of units configured and capacity for each configuration scheme,and compare the net energy consumption values of the nine configuration schemes with the energy consumption values of the pure steam absorption bromine unit to determine the feasibility of the other 9 configuration options.Then,the factors affecting the applicability of the unit configuration scheme are further analyzed.Through analysis,it is concluded that the internal circulation resistance and the transmission distance of the unit have a great influence on the applicability of the unit configuration scheme.After analysis,it can be concluded that under certain conditions,there are several scenarios where all of the above configurations are applicable,so this paper proposes three evaluation indicators for the program optimization,these three indicators are:1)delivery distance The longest;2)The net energy consumption accounts for the smallest proportion of the total energy consumption;3)The unit's energy consumption bears the largest cooling load.The evaluation of these three indicators shows that:when the transmission distance L<693m,the optimal configuration of the unit with Case9 is selected;when the transmission distance is 693m<L<1126.4m,the optimal configuration of the unit with Case3 is selected;when the transmission distance is L For the condition of>1126.4m,the unit configuration scheme using Case1 is the best.Research shows that there are certain applicable ranges for hybrid absorption refrigeration systems.Then Case9 is as a research object,a comprehensive evaluation was conducted on both energy conservation and environmental protection.According to the analysis,in terms of energy efficiency:it can save 2310.78 Nm~3 of natural gas in the whole year.The energy consumption of the chilled water supply and return water in the Case 9system at 7/12°C and 12/18°C was analyzed and compared.It was concluded that the latter was 6.5%more energy-efficient than the former.In terms of environmental protection,the flue gas exhaust temperature is lowered to 39.1°C,and the maximum temperature can be reduced to 49.2°C,which is lower than the dew point temperature of flue gas 58.7°C.Therefore,it has a certain effect on environmental protection.