UNUSED, 155,640 lbs. EVAPORATOR #235483 For Sale

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155640 lbs/hr praj industries ltd. tube - rising and falling film evaporator
( 70579 kg/hr praj industries ltd. tube - rising and falling film evaporator )

IPPE Stock Number: 235483

Equipment Category EVAPORATOR
Capacity 155640 LBS/HR / 70579 KG/HR
Product Description UNUSED, 155,640 lbs./hr. (water evaporation), 316 SS, four effect forced circulation evaporation system. Built to ASME code and code stamped. The tubes of 316 SS of all four effects are rated for FV/40 psi at 230 degrees F., the shells are rated for FV/16 psi at 266 degrees F. The complete system four effects, including finishers, is comprised of the heaters, vapor bodies, and pumps. Manufactured by Praj Industries LTD. The four effects are 7782 Sq.Ft., 316 SS Tubes, 316 SS Tube sheets, 316 SS heads, 316 SS Shell, horizontal heat exchangers. They are 6' diameter x 27' 8" long, each with 1110 straight tubes, 1.5" diameter x 0.063" wall x 19' 8". Tube pitch 1.875”, 4 baffles, with spacing 4' 11". Single pass shell, four pass tubes. Shell nozzles are 14" and 3", tube nozzles are two 24". The Four Vapor bodies are 9,535 Gallons, 316 SS, vertical vapor liquor separating tanks for the effects. NB Stamped and rated for FV/10 psi at 230 degrees F., with dimensions of 9' 9" diameter x 14' straight side with welded dish top head, and cone bottom (4' 11"long), mounted on skirt lug ring supports. The vessel wall thickness is 0.315. The recirculating pumps are 7,925 GPM, 316 SS, horizontal centrifugal pumps with AC motors. They are manufactured by Flowserve and driven by a 200 HP motor. In addition, the system also includes a 5672 Sq.Ft., 304 SS Tubes,304L SS Tube sheets, 304L SS heads, 304L SS Shell, horizontal heat exchanger as a finisher and a 580 Sq. Ft. Surface condenser, with 304 SS Tubes, 304L SS Tube sheets, 304L SS heads, and a 304L SS Shell.

Used Evaporators

Used Evaporators - Industrial Equipment Evaporators are used to concentrate a solution, separating the vapor from the solution. All evaporation equipment contains a heat exchanger for heating the process solution and a means to effectively separate the vapor from the residual liquid, called a vapor separator. Evaporator performance is rated by Lbs per hour or Kg per hour of evaporation. The greatest increase in steam economy is achieved by reusing the vaporized solvent. This is done in a Multiple Effect Evaporator by using the vapor from one effect as the heating medium for another effect in which boiling takes place at a lower temperature and pressure. Another method of increasing the utilization of energy is to use a Thermo Compression evaporator, in which the vapor is compressed so that it will condense at a temperature high enough to permit its use as the heating medium in the same evaporator. This type is also called a MVR or mechanical vapor recompression.

Types of Evaporators

Short tube vertical evaporators are natural circulation evaporators. These units consist of short tubes 4-6 feet long and 2” to 4” in diameter set between two horizontal tube sheets that span the evaporator body diameter. The tube bundle contains a large circular down comer that returns concentrated liquid above the top tube sheet to below the bottom tube sheet for product withdrawal. The driving force for flow of liquid through the tubes is the difference in density between the liquid in the down comer and the tubes.

Long tube vertical evaporators accomplish more evaporation than in all other types combined. They are also natural circulation evaporators. They are also categorized individually as rising film, falling film, and rising/falling film types. Basically these units consist of a vertical single pass shell and tube heat exchanger discharging into a relatively small vapor head. Tube length is typically12’ to 36’; and the tube diameters are from 0.75” to 2” OD. Units may be once through or recirculating, depending upon the application. Long tube evaporators are the most economical design.

  • Rising Film – feed liquor enters at the bottom of the tube and boils part way up the tube with the mixture of liquid and vapor leaving at the top. As the liquid in the tubes boil the vapor generated from boiling fills the core of the tube forcing the liquid to the side wall. As the liquid moves up the tube more vapor is formed and the remaining liquid thins out and moves more rapidly up the tube increasing the heat transfer coefficients and reducing the residence time
  • Falling Film – feed liquor enters the top of the tube and flows down the tube wall as a thin film. Since the film is moving in the direction of gravity, a finer and faster moving film results, yielding higher heat transfer coefficients and reduced contact times. The flow of vapor and liquid may be co-current in which the vapor-liquid separation takes place at the bottom, or counter-current where the liquid is drawn from the bottom and the vapor from the top

Forced circulation evaporators are made in a variety of arrangements for services where the feed and/or product liquor has a tendency to salt or scale and where the viscosities of the solutions are so high that natural circulation is not feasible. Force circulation is achieved by using pumps. Forced circulation leads to high tube side velocities and higher heat transfer coefficients and smaller heating surfaces. The pump withdraws liquor from the flash chamber and forces it through the heating element back to the flash chamber. Circulation is maintained regardless of the evaporation rate so this type of evaporator is well suited to crystallizing operations where solids must be maintained in suspension at all times.

Thin Film or Wiped Film are agitated evaporators - essentially a large diameter jacketed tube, in which the product is vigorously agitated and continuously removed from the tube wall by scraper blades or wipers mounted on a shaft rotating inside the tube. The material to be processed is continuously spread as a thin film on the tube walls by the mechanical agitator. This permits processing of extremely viscous and heat sensitive materials, as well as products that crystallize. The heating medium may be steam or hot oil on the jacket side.


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