Three Effect Falling Film Evaporator Chemical pharmaceutical industry with good price
Evaporation
Evaporation is the process used to concentrate a solution by removing the solvent(mainly water) in a purified form by the application of heat.
Evaporation is the unit operation by which solvent is evaporated from the solution by boiling the liquid in suitable vessel and withdrawing the vapor,leaving a concentrated liquid residue.
Multi effect evaporation basic introduction
The multi effect falling film evaporator uses the falling film evaporation principle to heat and boil the dilute solution to vaporize part of the water, so as to achieve the purpose of concentrating the solution. The unit adopts continuous production process. It has the advantages of large concentration ratio (1 / 5-1 / 10), wide viscosity range (< 400CP), good heat transfer effect and large treatment capacity. It is suitable for evaporation of heat sensitive, high concentration, high viscosity and corrosive materials. It is suitable for corn pulp and maltose juice in starch industry, juice and flavored semen in food industry and milk in dairy industry, Concentration of distiller's grains filtrate in sugar industry and alcohol industry.
The unit has large heat transfer coefficient and small heat transfer temperature difference. According to the different characteristics of evaporation materials and evaporation targets, it can be combined into double effect, three effect, four effect and five effect evaporation systems. It can also use the waste steam from the top of tube bundle or disc dryer and other low calorific value heat sources (such as condensate steam) as the heat source of evaporator to become waste heat evaporator, which can greatly reduce the consumption of raw steam and achieve the maximum energy saving effect. When there is sufficient supply of waste heat steam, no steam will be needed at all, and remarkable economic benefits can be achieved.
Material process
(1) The raw material is delivered to the front primary preheater by the feed pump through the electromagnetic flowmeter, and then enters the top of the primary effect heater through the liquid distributor for primary falling film evaporation and concentration;
(2) The first effect concentrated liquid is transported to the top distributor of the second effect heater by the first effect bottom material circulating pump for secondary falling film evaporation concentration.
(3) The second effect concentrated liquid is transported to the top distributor of the third effect heater by the second effect bottom material circulating pump for third times of falling film evaporation concentration;
(4) Third effect concentrated liquid discharge, according to the online detection of the hydrometer, real-time detection of the material concentration, if the material concentration reaches the set requirements, it will be interconnected with the discharge valve to open the discharge valve and transport the material to the finished product tank, otherwise, it will open the material circulation valve to make the material recycle into the evaporator again for re evaporation.
Steam process
The raw steam enters the primary effect heater for heating evaporation concentration: the secondary steam generated by the primary effect heats the secondary effect, and so on. The secondary steam generated by the third effect enters the end condenser for condensation cooling, and the condensate water is discharged by the condensate pump.
Condensate process
The condensate water produced by the primary effect preheating the materials through the water transfer pipe at the bottom of the shell, to save the consumption of raw steam;
The condensate water produced by the secondary and third effect is discharged by the condensate pump, and the discharge has reached zero pollution. The non condensing gas is connected to the end condenser by the non condensing gas pipe and discharged by the vacuum pump.
Technical parameters of falling film evaporator
| Type | Single effect | Double effect | Three effect |
| Evaporative capacity (kg/h) | 300-2000 | 1200-4000 | 3600-15000 |
| Feeding material density % | According to material | ||
| Discharge material density % | According to material | ||
| Steam pressure | 0.5-0.8 | ||
| Steam consumption / Evaporative capacity(with heat pressure pump) | 0.65 | 0.38 | 0.28 |
| Evaporating temperature | 45-90 | ||
| Sterilizing temperature | 90-110 | ||
| Cooling water consumption / Evaporative capacity (inlet 20°C, outlet 40°C) | 28 | 11 | 8 |
| Note: we can design custom product according customer's requirement. | |||
Working principle drawing
Our production capability and client site
