Energy recovery and plume reduction from an industrial spray drying unit using an absorption heat transformer |
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| Affiliation: | 1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. School of Civil Engineering, University of South China, Hengyang, 421001, China;3. Gree Electric Appliances, Inc. of Zhuhai, 519070, China;4. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082, China;1. School of Energy and Environment, Southeast University, Nanjing 210096, China;2. Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, Southeast University, Nanjing 210096, China;3. Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology, Southeast University, Nanjing 210096, China;1. School of Landscape Architecture, Zhejiang A &F University, Hangzhou 311300, China;2. Lab of Refrigeration Heat Pump and Air Conditioning Technology, Henan University of Science and Technology, Luoyang 471023, China;3. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, MOE, Tianjin 300072, China;4. China Electronics Technology Group Corporation No.38 Research Institute, Hefei, Anhui Province, China;5. Institute of Refrigeration and Cryogenics Zhejiang University, Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou, China |
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| Abstract: | Spray drying is a widely used unit operation in the chemical industry. It is highly energy intensive, requiring hot, dry airstreams, at temperatures up to 550°C, to dry a wide range of products. Exhaust air from a dryer is usually vented to the atmosphere with little or no heat recovery. At best only the sensible heat associated with the air stream is recovered, although the majority of the stream's energy is in the form of latent heat associated with the evaporated water. Exhaust airstreams usually contain moisture to cause visible plumes upon leaving the dryer stack.A two-stage absorption heat transformer (A.H.T.) has been designed and contructed to investigate the potential for dehumidifying and reheating a simulated dryer exhaust stream to make it suitable for recycling to the dryer inlet. The amount of air vented to atmosphere and also the amount of wasted heat would be reduced by incorporating an A.H.T. into the drying operation. Performance data for the A.H.T. indicates that an airstream can be reheated to a temperature of 160°C, using a lithium bromide solution of 68% w/w, with a circulation ratio (LiBr: steam flow) of 14.8. Temperature lifts between 50 and 70°C are possible in the reheat column when using a low circulation ratio and a high LiBr concentration. Experiments show that a humid air stream can be dehumidified to a level suitable for recycling by direct contact with a concentrated lithium bromide stream. |
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