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1、1,冷却过程 COOLING PROCESS,冷却过程是在一定的时间内将产品的温度和水分平衡到标准质量状态的一种热交换过程。The process balanced temperature and humidity of the product to standard quality within limited time,定义 / Definition,2,温度平衡 TEMPERATURE EQUILIBRIUM,热通过蒸发过程而变成水蒸汽HEAT USED FOR EVAPORATION PROCESS TO VAPOR热通过热的传播过程传递到冷却介质上HEAT TRANSFER TO C
2、OOLANT (MOIST AIR) THROUGH THERMAL DIFFUSION PROCESS,3,- 毛细管作用造成的液体流动LIQUID MOVEMENT DUE TO CAPILLARITY渗透力造成的液体流动LIQUID MOVEMENT DUE TO OSMOTIC FORCE- 水份差异造成的液体流动（液体扩散作用）LIQUID MOVEMENT DUE TO MOISTURE CONCENTRATION DIFFERENCE (LIQUID DIFFUSION),温度平衡 TEMPERATURE EQUILIBRIUM,4,- 重力造成的液体流动LIQUID MOVEM
3、ENT DUE TO GRAVITY- 水份差异造成的蒸汽流动（蒸汽扩散作用）VAPOR MOVEMENT DUE TO MOISTURE CONCENTRATION DIFFERENCE(VAPOR DIFFUSION)- 温度差异造成的蒸汽流动（热扩散作用）VAPOR MOVEMENT DUE TO TEMPERATURE DIFFERENCE (THERMAL DIFFUSION),温度平衡 TEMPERATURE EQUILIBRIUM,5,冷却过程 Cooling Process,1. 蒸发 EVAPORATION2. 热扩散 THERMAL DIFFUSION3. 机械或化学力造成
4、的液体流动Liquid movement by Mechanical & Chemical Force4. 机械或化学力造成的蒸汽流动Vapor movement by Mechanical & Chemical Force,6,颗粒料冷却 PELLET COOLING,它是通过蒸发和热扩散过程，使料的温度和环境空气相平衡，从而降低颗粒料温度和水份（粉状料经过蒸汽调质与制粒过程而增加的温度与水份部分）的一种过程。The process of decreasing temperature and moisture from pellets(which increase by mash condi
5、tioning with steam and pelleting process.)环境空气进入冷却器，在一定的时间内与颗粒料外表面接触，直到 颗粒料温度不超过环境温度 +5 oC以上, 颗粒水份不超过 12%.by temperature and humidity balance with ambient air through the evaporationand thermal diffusion process, the ambient air is brought in contact with the outer surface of the pellets in the cool
6、er within limited duration until the pellet Temperature is less than or equal the ambient temperature +5 oC and the pellets moisture must not be exceed 12%.,7,Cool Air,Warm Air,Vapor,Vapor,Water,Heat,温度降低原因有： Temperature Decrease by 蒸发(热用于将液体变成蒸汽）Evaporation (heat used for change liquid to vapor) 热扩
7、散(热传递出去) Heat Diffusion (heat transfer out)水份降低原因有： Moisture Decrease by 蒸发 (蒸汽脱离) Evaporation (vapor move out) 运动力 (液体脱离) Kinetic Force (liquid move out),颗粒料冷却 PELLET COOLING,8,颗粒料冷却 PELLET COOLING,40 C 12%M,32 C Ambient Temp.,Heat Diffusion,32 C 11%M,32 C Ambient Temp.,Heat Balance,Surface 14%M,9,
8、颗粒料冷却特性 PELLET COOLING CHARACTERISTIC,卧式冷却器 / CROSSFLOW COOLER,Air Flow,Product flow,Air Inlet Temp,Air Outlet Temp,Pellet Begin Temp,Pellet End Temp,10,逆流式（或立式）冷却器 / COUNTERFLOW COOLER,Air Flow,Product flow,Air Inlet Temp,Air Outlet Temp,Pellet Begin Temp,Pellet End Temp,颗粒料冷却特性 PELLET COOLING CHAR
9、ACTERISTIC,11,颗粒料冷却曲线图 PELLET COOLING PROFILE,Evaporation Stage,Thermal Diffusion,Ambient Temperature 30 C Relative Humidity 70 %,12,Evaporation Stage,Liquid & Vapor Movement,Ambient Temperature 30 C Relative Humidity 70 %,颗粒料冷却曲线图 PELLET COOLING PROFILE,13,冷却过程影响因素 The factors effected to cooling p
10、rocess.,颗粒状态 Pellets- 温度 Temperature- 水份 Moisture- 密度 Density- 大小和形状 Size & Shape- 油脂喷涂 Fat Coated,14,2. 环境空气 Ambient Air- 温度 Temperature- 相对湿度 Relative Humidity- 风量 Volume- 蒸气压力 Vapor Pressure- 空气中水份与蒸气浓度 Water content and vapor content in the air颗粒料在空气中的流动时间Time that pellets move within the air,冷却
11、过程影响因素 The factors effected to cooling process.,15,EVAPORATION,THERMAL DIFFUSION LIQUID& VAPOR MOVEMENT,PRODUCT IN,PRODUCT OUT,MOIST AIR IN,MOIST AIR OUT,16,影响动物消化的因素 Animal digestion factors,1. 蒸发 Evaporation- 颗粒温度 Pellet temperature- 颗粒湿度 Pellet moisture- 油脂喷涂 Fat coating- 风量 Air volume- 蒸气压力 Vapo
12、r pressure,17,2. 热传递 Heat transfer- 颗粒温度 Pellet temperature- 颗粒密度 Pellet density- 颗粒大小与形状 Pellet size and shape- 油脂喷涂 Fat coating- 风量 Air volume- 空气温度 Air temperature- 颗粒停留时间 Pellet dwell time,影响动物消化的因素 Animal digestion factors,18,3.4 因机械和化学作用造成的蒸气/液体流动Vapor / liquid movement by mechanical and chemi
13、cal force- 颗粒水份 Pellet moisture- 颗粒密度 Pellet density- 颗粒大小与形状 Pellet size and shape- 风量 Air volume- 空气相对湿度 Relative humidity of air- 空气蒸发压力 Air vapor pressure- 空气中水份与蒸气浓度 Moisture and vapor air content- 颗粒停留时间 Pellet dwell time,影响动物消化的因素 Animal digestion factors,19,冷却过程需要的风量 Air Volume Required for
14、Cooling Process,为降低1000 KGs.颗粒料温度与水分: 进料温度 90 C 出料温度 33 C 进料水份 15% 出料水份 12% 采用30 C 的环境空气 冷却器空气出口温度 45 CTo decrease temperature and moisture of 1000 KGs.-pellets Pellets Inlet Temp. 90 C Pellet Outlet Temp. 33 C Pellets Inlet Moisture 15% Pellet Outlet Moisture 12% By using the ambient air at 30C Outlet temperature from cooler 45 C,
