The Study Of Application And R&d Of Cold Storage Of Using Power Plant Waste Heat Refrigeration For Fruits And Vegetables

In view of the huge output of fruits and vegetables in developing countries while the capacity of refrigerating facilities is obviously insufficient,the cold storage industry is in urgent need of development while the power and other energy sources are in short supply.This project is supported by the R&D project of waste heat cooling and fruits and vegetables temperature preservation in Bangladesh power plant.Through the design and construction,performance study,performance optimization,pre-cooling technology test and sub-ambient temperature storage of potato simulating lithium bromide waste heat and temperature control laboratory and other experiments to confirm the feasibility of absorption lithium bromide refrigeration technology applied to ordinary cold storage and application of potato at sub-ambient temperature storage.the main results are as follows:(1)Design and construction of experimental Library.It can be obtained through calculation that the required cooling capacity of 20t experimental cold storage is 2.8 kw,the cooling capacity of 2000t cold storage is 280kw,the power consumption of lithium bromide absorption chiller is about 14 kw,and the power consumption of obtaining the same cooling capacity ammonia unit About 29 kw,the general cooling one machine needs to consume about 46 kw.50%energy saving than the ammonia unit,saving 71%energy than the traditional electric refrigerator,with a high energy-saving effect.(2)Waste heat refrigerator performance test.Under different external temperatures,the empty temperature drop in the laboratory can be controlled within 2 h,the temperature lower limit is 7℃,and the cooling effect is remarkable.Different storage temperature,different pre-packaged potato temperature can be controlled within 400 min,and the lower limit of temperature stability at 7.5 ℃.It is proved that the experimental database should be used to cool fruits and vegetables in hot field and achieve efficient conversion of waste heat,which has a good application value.(3)Optimization of parameters of waste heat refrigerating storage.The results show that the highest COP value and the highest energy conversion efficiency are obtained when the temperature of refrigerant water is 5℃,flow rate is 15 L/min and air volume is 3600 m3/h.Jacket air supply mode than a single air supply,one for two to send the wind to better maintain the uniformity of the temperature field in the library to reduce the lower limit of cooling.(4)Performance test of differential pressure pre-cooling equipment.Experimental results show that the precooling efficiency in situ large account>tunnel differential pressure>static precooling,precooling uniformity in situ large account>tunnel differential pressure>static precooling,and differential pressure precooling pre-cooling perforated cardboard box The most obvious effect of improving efficiency,followed by nylon bag>PE bag>bare box.(5)Study on storage effect of potato simulated waste heat refrigeration storage.Experimental results 8 ℃+0.3 g/kg CIPC treatment group and 4 ℃ low temperature storage effect is equivalent to 120 days after storage potato,weight loss rate,germination rate,decay rate,browning degree and other indicators superior to other groups,reducing sugar,Starch,Vc,dry matter content are better than the control,amylase activity,respiratory intensity have a certain degree of control,CIPC residues meet the national standard requirements.