In the dairy industry production, the selection of advanced and reasonable machinery and equipment is of great significance for ensuring product quality, reducing operation and maintenance costs, improving the competitiveness and economic benefits of dairy products, and promoting the development and technological progress of the dairy industry. In terms of liquid milk, the selection of aseptic filling equipment and processes is particularly prominent, but there are also problems in selecting equipment to reduce operating costs.
The design of the falling film evaporator of the milk powder industry and the selection of the traditional falling film evaporator design are to save energy and reduce consumption by increasing the number of steam utilization (single effect and multi-effect). However, the increase in the efficiency increases the steel consumption by a factor of two, and the cost increases exponentially. Due to the limitation of the heat transfer temperature difference, the increase in the efficiency generally does not exceed seven effects. With a steam jet heat pump, the double-effect falling film evaporator with a water jet is the design of a common falling film evaporator.
The application of the heat pump in the falling film evaporator adopts the machine heat compression type heat pump compression device and can be a centrifugal type and a volume type compressor. The compression temperature difference is relatively large, generally around 11 °C, which limits the effectiveness of the mechanical compression heat pump to generally no more than three effects, and the solution with higher boiling point is limited when it evaporates, and the structure is complicated and the cost is high. Maintenance costs are high and power consumption is high, so mechanical compression heat pumps are rarely used.
The steam-jet heat pump steam-jet heat pump is similar to the venturi tube, and has no transmission device. The structure is simple and the application is more. Compared with a heat pump without a heat pump, it can be equivalent to an increase in efficiency.
The partition wall condenser and the water ring vacuum pump with heat pump, coil condenser, water ring vacuum pump condenser and crop material preheater make full use of the heat of the last effect secondary steam and reduce the consumption of cooling water. The final secondary vapor of this type of multi-effect falling film evaporator is condensed into water of the same temperature (only phase change occurs) and then discharged from the condenser. The condensate has a very high temperature and is soft water and can be used well. The water ring vacuum pump sucks the non-condensable gas of the evaporator and a small amount of steam and discharges it to the atmosphere. And maintain a certain degree of vacuum in each effect evaporation. Compared with the use of hydraulic ejector, cooling water consumption and power consumption are low. Take the two models RNJM02-2400 double-effect falling film evaporator of Fuyu Guangming Dairy Group as an example, the evaporation capacity is 2400kg/h, the supporting water ring vacuum pump motor power is 5.5kw, the cooling water consumption is 9t/h, and the inlet water temperature is l0. °C, the drainage temperature is 38 °C, compared with the same capacity hydraulic sprayer double effect falling film evaporator, the power is reduced by 13.5kw, saving 13 tons of cooling water per hour. According to the water supply price of 1.00 yuan / ton, the drainage price of 0.80 yuan / ton, electricity and water can reduce operating costs of 143,391 yuan a year, 3 years can recover all equipment investment.
A three-effect falling film evaporator using a mixed tube condenser, a cooling water tower, a water ring vacuum pump with a heat pump, a material preheater, a mixing condenser, a cooling water tower and a water ring vacuum pump is used for cooling by a tubular condenser and a water ring vacuum pump structure. After the water circulation pump sends the cooling water to the water tower, the temperature of the cooling water is lowered by 8 ° C, which is generally 6 ° C in the calculation of most evaporators. The pressure requirement of the cooling water circulation pump is not high. As long as the cooling circulating water is sent to the cooling tower, only the cooling water can be recycled through the cooling tower during the working process, and the low-temperature cold water is hardly added, and the water saving effect is particularly remarkable, especially in Water-deficient areas are more meaningful.
The selection of the multi-effect evaporator supporting pump is now using a single-end mechanical seal pump. I have used the fluoroplastic alloy pump of Jiangsu Jingjiang Pump and Valve Factory and successfully applied it to the production of vitamin C in the pharmaceutical factory of Jilin Songyuan Food Industry Co., Ltd. The purpose is to solve the special requirement of vitamin C for the corrosion resistance of the pump. Later, it was successfully applied to the RNJM03-5000 three-effect falling film evaporator, and it has been applied well in Longdan Group and Hailar Bright Dairy Company. However, this fluoroplastic alloy pump only removes the water supply at the mechanical seal, and the matching motor power does not change much with the pump selected in the past. Later, Wuxi Jiuyang Pump Co., Ltd. ICB series single-end mechanical seal stainless steel stamping pump was selected, which was also used on RNJM02-2400 double-effect falling film evaporator, feed pump type ICB50-25-200, flow rate 6.3m3/ h, head 32m, motor power 2.2kw, the other two material pumps and one condensate pump use ICB32-25-125 pump, flow 3.2t / h, head 20m, motor power 0.55kw, make RN-JM02-2400 The total power of the unit of the double-effect falling film evaporator is only supported by the centrifugal pump. The power is reduced by 6.75kw, 300 days per year, and 16 hours per day (two shifts), saving 32,400 yuan per year. The use of Tianxi Jiuyang ICB series pump is very effective in Harbin Oil Factory.
In the spray drying system, only the exhaust fan is used instead of the inlet fan. There are four sets of centrifugal spray drying units in the Daqing Dairy Factory in Heilongjiang. This is the design and used for many years. The Daqing brand milk powder produced is a national quality product. Taking RGLP-500 drying unit as an example, according to the traditional design, the inlet fan model is 4-72-12No8C, the air volume is 20100m3/h, the wind pressure is 2445Pa, the motor power is 30kw, and the annual electricity cost can be saved by 144,000 yuan.
Reasonable selection of high pressure pump high pressure pump working pressure is generally 14MPa, and generally choose 25MPa high pressure pump. The flow selection can be as long as it meets the needs. When the high-pressure pump is delivered from the factory, the matching motor power is designed according to its rated pressure and flow rate, and the working pressure is far lower than the rated pressure of the pump, so the power under the working flow and pressure is much smaller than the rated output power. Selecting a motor with a motor power that meets the output power requirements of its operation can reduce the total power of the drying system and reduce operating costs. Heilongjiang Yi'an Dairy Factory is doing this. RPYP03-500 type drying unit, the traditional high pressure pump type is GJB1-25 type, the supporting motor power is 7.5kw, and the same type of high pressure pump is selected by Yi'an Dairy Factory, and the matching motor is replaced with power of 5.5kw, which can save one year. The electricity cost is 10,000 yuan and the operation has been good.
Adopting a reasonable structure, the traditional spray drying unit is used to pack powder, which is divided into a first-grade cyclone powder and a second-level bag. For example, the first level of powder is a cyclone, the second is also a cyclone, and the exhaust fan is two. The air volume of the first-stage exhaust fan is relatively large, the wind pressure is low, and the air volume of the second-stage exhaust fan is relatively small, and the wind pressure is high. The total power of the bench machine is the same as that of a conventional exhaust fan. Compared with the traditional selection of an exhaust fan, the size of the secondary cyclone cyclone separator becomes smaller, saving stainless steel materials, reducing investment, and facilitating layout.
Reasonable use of heat energy to preheat the intake air by exhausting air, and then preheating the incoming air by heating the condensed water heated by the steam to fully utilize the waste heat, thereby achieving the purpose of energy saving and consumption reduction.
Intubation Simulator,Baby Care Model,Neonatal Model
Hongrui Medical Devices Co., Ltd. , http://www.zzcprtrainingmodel.com