Design and Test of Cold Heat Balance Dryer Based on Multi Heat Pump System
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摘要: 针对农产品干燥加工过程冷热量需求差异性大的问题,提出了双效热泵系统、三效热泵系统定比耦合构建冷热均衡系统的思路,定量核算并选型确定了热泵系统的主要零部件,设计了双效与三效机组比值为3∶1多热泵系统组合的冷热均衡干燥机控制逻辑,与企业联合研制了一拖多冷热均衡干燥机,该机批次可处理腊肠原料12 000 kg。以“三七”广式腊肠为试验物料进行了测试,数据显示冷热均衡干燥机平均温度控制精度为-2.75%~1.65%,平均相对湿度控制精度为-3.92%~1.85%,干燥不均匀度为1%,抽检试验批次产品的感官性质合格,平均水分为15.76%,亚硝酸盐含量和过氧化值远小于国标限定值,整体品质达到特级腊肠要求;本机亦适用于果蔬、肉制品及水产鱼制品的批次干燥加工。Abstract: In view of the large difference of cold and heat demand in the drying process of agricultural products.The idea of constant ratio coupling of double effect heat pump system and three effect heat pump system to construct cold and heat balance system is proposed.Then,the main parts of the heat pump system are determined by quantitative accounting and model selection,and then the control logic of cold and heat balance dryer combined with multi heat pump system with the ratio of double effect unit to three effect unit of 3:1 is designed.Finally,one driven multi cold and heat balance dryer,which can process 12 000 kg of sausage raw materials in batches,has been jointly developed with the enterprise.“Panax notoginseng”Cantonese sausage was used as the test material,The data show that the average temperature control accuracy of the cold and heat balance dryer is-2.75%~1.65%,the average relative humidity control accuracy is-3.92%~1.85%,and the drying unevenness is 1%.Sensory properties of the products in the test batch are qualified through sampling inspection,its average moisture content is 15.76%,the nitrite content and peroxide value of the products are far less than the limit value of the national standard,and the overall quality meets the requirements of super sausage.The cold and heat balance dryer combined with multi heat pump system is also suitable for batch drying and processing of fruits and vegetables,meat products and aquatic fish products.
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Keywords:
- heat pump /
- cold heat balance /
- one driven multi /
- dryer
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