Thin film evaporator is a type of evaporator, which is characterized by heat transfer and evaporation of materials along the wall of the heating tube as a membrane flow, high heat transfer efficiency, fast evaporation speed, short residence time of materials, suitable for the evaporation of heat-sensitive substances. According to the reason and flow direction of the film, can be divided into three types: ascending film evaporator, descending film evaporator, scraping film evaporator. The following introduces the film evaporator use step, application, improve efficiency measures.
Thin film evaporator use step
1. Prepare before driving
(1) General products have been factory hydraulic test and test run, and indicators meet the requirements.
(2)Turn on the motor, observe whether the running direction of the motor is correct, it should be clockwise rotation, not reverse.
(3) Measure the radial swing and axial string movement of the shaft to see if it meets the requirements, and check whether the seal is sealed tightly at the sealing place.
(4) Whether the oil level of the reducer is in normal state, and whether the cooling water of the mechanical seal is kept unobstructed.
2.Normal driving
(1)Turn on the circulating cooling water pump, and let the
Condenser in operation. Then open the concentrate container and vacuum valve.
(2) Open the feed valve and pump in the liquid. Turn on the power supply and start the motor, and at the same time, observe whether the rotation direction of the motor is correct.
(3)Open the steam valve slowly, connect the traps, make the steam pressure about 0.15MPa.
(4) Observe the discharge of the evaporator, wait until the equipment runs stably for 5 minutes, and then sample and analyze the concentration of the concentrate. Concentrate container liquid level will be full, should be switched to another easy, according to the steps for switching.
3. Normal stopping normal stopping order is: close the steam valve - close the feed valve - after the material liquid discharge, close the discharge valve - the flushing of equipment -Stop the motor -Stop the circulating water pump, jet pump -Open the vacuum destroying valve.
4.Safety Precautions
(1) In the case of no material liquid or liquid material full, can not start the motor for mixing.
(2) The motor is strictly prohibited from running in reverse, and when it is running, you can't touch the rotating parts with your hands.
(3) Cannot press the button with wet hands to prevent electric shock.
Application of thin film evaporator
Thin-film evaporator has the characteristics of high production efficiency, large production capacity, short time of material heating, etc. It can be widely applied to the concentration of dilute solution of various chemical materials.
Scraper film evaporator a kind of high-efficiency evaporation, distillation equipment, which is mainly with the help of high rotation will be distributed into a uniform film of liquid and evaporation or distillation. At the same time can also use the scraper film evaporator for deodorization, defoaming reaction and heating, cooling and other unit operations, at present the device has been widely used in Chinese and Western pharmaceutical, food, light industry, petroleum, chemical, environmental protection and other industries, especially the equipment can be used to deal with the concentration of high, viscous, heat-sensitive, easy to scale and other characteristics of the material.
Thin film evaporator how to improve efficiency
1. Choose suitable working pressure and temperature: the operating efficiency of the evaporator is related to temperature and pressure, and suitable working pressure and temperature must be chosen to ensure that the efficiency of the evaporator reaches the maximum.
2. Control feed quantity and quality: The control of feed quantity and quality directly affects the operation efficiency of evaporator. Should control the feed flow and quality to improve the operating efficiency of the evaporator.
3. Enhance the cleaning of heat exchanger: the heat exchanger of the evaporator may produce a lot of scale inside because of long-term operation, resulting in the decline of heat transfer efficiency, the heat exchanger should be cleaned regularly to ensure the heat transfer efficiency of the evaporator.
In addition to this, the following details can be optimized:
1, reduce the scraper film evaporator steam compressor running speed to make the flow reduced, so that the compressor to avoid the wheezing state, but the steam compressor outlet pressure will also be reduced, can use adjustable blade.
2, check the whole set of evaporator parts connection parts, whether there is leakage appears, timely and regular replacement of the flange connection at the gasket and other seals.
3, the evaporator is regularly cleaned, according to the
Evaporation System scaling, select the appropriate cleaning cycle, if the
Evaporation system scaling is serious, try to shorten the cleaning cycle.
4, evaporation system cooling water, water temperature is too high will cause the steam can not be condensed in time, so that the system vacuum is reduced, should be regularly to the circulating pool of cold water, keep the cooling water temperature is basically stable.
5, scraper film evaporator condenser scaling heat transfer efficiency decline, resulting in steam can not be condensed in time, so that the vacuum is reduced, so the condenser should be regularly inspected and cleaned.
Source: Xianjie.com
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