Quasar Process Equipment

Sadashivpeth, Pune, Maharashtra

Agitated thin film evaporator (also commonly referred to as a "Thin Film or wiped film evaporator") consists of two main parts: a cylindrical jacketed body which is heated by means of steam or thermic fluid and a rotor inside the cylindrical tube. Product is introduced above the heated zone on a distributor plate. This distributor plate evenly transfers the liquid over the evaporator's inner surface. As the product spirals down the wall, the high rotor tip speed generates centrifugal force and due to low clearance between rotor blades and cylinder inner surface, it creates thin film. This thin film and heated surface create optimum heat flux and mass transfer conditions. Volatile components are rapidly evaporated via conductive heat transfer. Vapours flow either counter-currently or co-currently through the unit, depending on the application requirements. The vapours are passed through condenser and collected. Residual components are discharged at the outlet. Continuous agitation and mixing by the rotor blades minimizes fouling of the thermal wall where the product or residue is most concentrated. Advantages are less residence time, can handle heat sensitive materials and lesser space requirement.

A multiple-effect evaporator is an apparatus for efficiently using the heat from steam to evaporate water. In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapour boiled off in one vessel can be used to heat the next, and only the first vessel (at the highest pressure) requires an external source of heat. While in theory, evaporators may be built with an arbitrarily large number of stages, evaporators with more than four stages are rarely practical except in systems where the liquor is the desired product such as in chemical recovery systems where up to seven effects are used. An evaporator is essentially a heat exchanger in which a liquid is boiled to give a vapour, so that it is also, simultaneously, a low pressure steam generator. It may be possible to make use of this, to treat an evaporator as a low pressure boiler, and to make use of the steam thus produced for further heating in another following evaporator called another effect.

Agitated thin film evaporator (also commonly referred to as a "Thin Film or wiped film evaporator") consists of two main parts: a cylindrical jacketed body which is heated by means of steam or thermic fluid and a rotor inside the cylindrical tube. Product is introduced above the heated zone on a distributor plate. This distributor plate evenly transfers the liquid over the evaporator's inner surface. As the product spirals down the wall, the high rotor tip speed generates centrifugal force and due to low clearance between rotor blades and cylinder inner surface, it creates thin film. This thin film and heated surface create optimum heat flux and mass transfer conditions. Volatile components are rapidly evaporated via conductive heat transfer. Vapours flow either counter-currently or co-currently through the unit, depending on the application requirements. The vapours are passed through condenser and collected. Residual components are discharged at the outlet. Continuous agitation and mixing by the rotor blades minimizes fouling of the thermal wall where the product or residue is most concentrated. Advantages are less residence time, can handle heat sensitive materials and lesser space requirement.

A multiple-effect evaporator is an apparatus for efficiently using the heat from steam to evaporate water. In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapour boiled off in one vessel can be used to heat the next, and only the first vessel (at the highest pressure) requires an external source of heat. While in theory, evaporators may be built with an arbitrarily large number of stages, evaporators with more than four stages are rarely practical except in systems where the liquor is the desired product such as in chemical recovery systems where up to seven effects are used. An evaporator is essentially a heat exchanger in which a liquid is boiled to give a vapour, so that it is also, simultaneously, a low pressure steam generator. It may be possible to make use of this, to treat an evaporator as a low pressure boiler, and to make use of the steam thus produced for further heating in another following evaporator called another effect.