Industrial Design of Milk Film Design and Selection of Falling Film Evaporator The traditional design of falling film evaporator achieves the goal of saving energy and reducing consumption by increasing the number of steam utilization (single-effect, multiple-effect). However, the increase in the number of effects of steel consumption doubled, the cost will be doubled, due to heat transfer temperature limits, the increase in efficiency generally does not exceed seven. Double-effect falling film evaporator with steam jet heat pump and water jet ejector is the design of common falling film evaporator.
The application of heat pump in falling film evaporator Adopting the machine heat compression heat pump compression device can be centrifugal and positive displacement compressor . Compression temperature difference is larger, generally about 11 ℃, which limits the effectiveness of the use of mechanical compression heat pump is generally not more than three, the higher boiling point evaporation of the solution is limited, and the structure is complex and costly, High maintenance costs, power consumption, so mechanical compression heat pump applications rarely.
The use of steam jet heat pump steam jet heat pump is like venturi tube, no transmission, the structure is simple, more applications. Compared with the heat pump without heat pump, can be equivalent to an increase effect.
The use of the wall condenser and water ring vacuum pump with heat pump, snake tube condenser, water ring vacuum pump condenser material as preheater to make full use of the last secondary steam heat, and reduce the consumption of cooling water consumption. The multi-effect, falling-film evaporator of this structure is characterized by the secondary steam condensing to the same temperature (with only phase change) and then exiting the condenser. Condensate has a high temperature, but also soft water, can be well utilized. Water ring vacuum pump will be non-condensable gas evaporator and a small amount of steam after the exhaust to the atmosphere. And to maintain the effect of evaporation have a certain degree of vacuum. Compared with the use of water jet, cooling water consumption, power consumption is lower. Take Liangjiu Dairy Group's two model RNJM02-2400 double-effect falling-film evaporators as an example, the evaporation capacity is 2400kg / h, the auxiliary water ring vacuum pump motor power is 5.5kw, the cooling water consumption is 9t / h, the inlet water temperature is 10 ℃, the discharge temperature is 38 ℃, compared with the double-effect falling film evaporator with the same ability of hydraulic ejector, the power is reduced by 13.5kw, saving 13 tons of cooling water per hour. According to the price of water supply 1.00 yuan / ton, drainage price of 0.80 yuan / ton, electricity and water a year to reduce operating costs 143,391 yuan, 3 years to recover all equipment investment .
The use of tube condenser and water ring vacuum pump structure using a hybrid condenser, cooling towers, water ring vacuum pump with heat pump, material preheater, mixed condenser, cooling tower and water ring vacuum pump three-effect falling film evaporator, cooled after cooling water circulation pump to the water tower, cooling water temperature decreases 8 ℃, most computing evaporator generally take 6 ℃. Cooling water circulation pump pressure is not demanding, as long as the cooling water circulating cooling water can be sent to the cooling process, the work process only through the cooling water tower recycling, almost no need to add cold water, water-saving effect is particularly significant, especially in the Water shortage areas have more significance.
Multi-effect evaporator supporting the choice of pump now uses single mechanical seal pumps, I have had the choice of Jingjiang, Jiangsu Valve Factory fluorine plastic alloy pump, successfully applied to the production of food industry companies Jilin Songyuan pharmaceutical factory of vitamin C, when the main The purpose is to solve the vitamin C on the pump corrosion resistance of this special request, and later successfully applied to RNJM03-5000 type three-effect falling film evaporator, and Dragon Group and the Hailar Bright Dairy company, the effect has been good. However, this fluorine plastic alloy pump is only the mechanical seal at the water removed, and supporting motor power and previous selected pump little change. Then choose Wuxi nine Yang Pump Company ICB series of single-end stainless steel mechanical seal stamping pump, also used in RNJM02-2400 double-effect falling film evaporator, feed pump model ICB50-25-200 type, flow 6.3m3 / h, lift 32m, motor power 2.2kw, the other two materials pump and a condensate pump are selected ICB32-25-125 type pump, flow 3.2t / h, lift 20m, motor power 0.55kw, RN-JM02-2400 Type double-effect falling film evaporator unit total power only supporting centrifugal pump This one to reduce power 6.75kw, according to 300 days a year, according to 16 hours per day (two shift work system) calculation, save electricity 32,400 yuan per year. Tin Tin nine Yang Yang ICB series pump selection, the use of good effect in Harbin oil plant.
In the spray drying systems use only the fan exhaust fan instead of into four sets of centrifugal spray dryer set at Daqing dairy factory, is designed that way, and use for many years, milk production of Daqing brand is a national high-quality products. Take RGLP-500 type dryer as an example, according to the traditional design, the inlet fan model is 4-72-12No8C, the air flow rate is 20100m3 / h, the air pressure is 2445Pa and the motor power is 30kw, which saves 144,000 Yuan of electricity bills annually.
Reasonable choice of high pressure pump high pressure pump working pressure is generally 14MPa, and generally choose 25MPa high pressure pump. Flow selection as long as the need to meet. High-pressure pump factory, the motor power is based on its rated pressure and flow design, and the working pressure is much lower than the rated pressure of the pump, so that the work flow, pressure under the power than its rated output power is much smaller if Select a motor power to meet the needs of its output power when the motor and its accompanying, you can reduce the total power drying system, reducing operating costs. Heilongjiang Yian dairy products is to do so. RPYP03-500-type drying unit, the traditional high-pressure pump model GJB1-25 type, supporting motor power 7.5kw, and according to the selection of dairy with the same type of high-pressure pump, the matching motor into power is 5.5kw, so a year savings Electricity 10,000 yuan, the operation has been good.
The use of a reasonable structure of the traditional spray dryer bag dusting, divided into a cyclone dust, two bags of dust. Such as the choice of a whirlwind powder is Tornado, the second is cyclone, and two exhaust fan, a fan of the air volume is relatively large, low pressure, the second exhaust fan air volume is relatively small, and the wind pressure is high, two The total power of the machine is the same as that of a traditional one. And compared with the traditional choice of an exhaust fan, the size of the secondary dusting cyclone separator becomes smaller, which not only saves stainless steel , reduce investment, but also easy to layout.
Reasonable use of heat to exhaust air preheating, and then heated steam on the air after the condensate on the air preheating, make full use of waste heat, so as to achieve the purpose of saving energy and reducing consumption.
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