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.
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.
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.
Type: Evaporator
Subtype: Wiped/Thin Film
Condition: Used
Material: Stainless Steel 316
Evaporation Rate: 4.5 kg/h (10 lb/h)
Total Heat Transfer Surface Area: 0.2 m² (2.2 ft²)
(Two SPDU's) product contact, complete Short path distillation plant. This unit was previously used to process 300 lbs/day of product. The system consists of two, 0.1 m2 short path distillation units, three cold traps, six hold up receivers, and a degassing column with a pre heater. All equipment is piped and mounted in a steel framework, including all pumps, vacuum pumps, heater, valves, and controls. This process system has the following attributes: Can operate up to 340 degrees C, It is capable of vacuum to 0.01 mbar. , has a short resonance time, is good for heat sensitive products and hazardous materials, is suitable for viscous products, and has an excellent turn down capacity. Product contact surfaces are finished to 0.62 um RA The process piping and hold up tank are jacketed. The cold traps feature double coils for hot and cold brine. The system includes all process pumps and vacuum pumps. Primary and secondary heaters are supplied by Sterling. Chillers are supplied by Micro Therm.
Orientation: Vertical. Vacuum: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: SMS Buss
Model: LN 1400
Condition: Used
Material: Hastelloy - C22
Clad: Yes
Evaporation Rate: 340.2 kg/h (750 lb/h)
Total Heat Transfer Surface Area: 14 m² (150.7 ft²)
with 316 SS rotor, Jacket rated for 218 psi at 482 degrees F. Heating surface area 150.7 Sq. Ft., Serial numbers: Lower Body Serial Number 1400/56, National Board Number 717; Interm body Serial Number 1400/56, National Board Number 716; Upper Body Serial Number 1400/56, National Board Number 715; Lower cone Serial Number 1400/56, National Board Number 718. Body is 850 mm inside diameter x 6320 mm to bottom of cone. Rotor assembly is 4 blade 316 SS construction, bottom cone is solid Hastelloy, shell is Hastelloy Clad. Unit driven by a 25 hp, 3 phase, 60 cycle, 230/460 volt motor, with Class 1 Group D label, Rotor speed is 880 rpm.
Diameter: 850 mm (33.5 in). Height: 6,320 mm (248.8 in). Orientation: Vertical. Pressure: 1.72 bar (25 psi). Temperature: 250 °C (482 °F). Vacuum: Yes. Mechanical Seal on Shaft: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Pfaudler
Condition: Used
Material: Stainless Steel 316L
Evaporation Rate: 79.4 kg/h (175 lb/h)
Total Heat Transfer Surface Area: 3.3 m² (35 ft²)
wiped film evaporator system. Jacket rated for 160 psi at 650 degrees F. Drive system by Pfaudler, 3 DTW With 158 Sq.Ft. external condenser, 316 SS tubes 316 SS tube sheet 316 SS heads CS shell NB # 43399 Shell side rated for 75 psi at 350 degrees F tube side rated for 75 psi at 350 degrees F. Serial # R384-1817. TEMA type BEU
Diameter: 914.4 mm (36 in). Height: 1,118 mm (44 in). Orientation: Vertical. Pressure: 1.03 bar (15 psi). Temperature: 343.3 °C (650 °F). Vacuum: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Leybold-Heraeus
Model: KD300
Condition: Used
Material: Stainless Steel 316
Evaporation Rate: 72.6 kg/h (160 lb/h)
Total Heat Transfer Surface Area: 3 m² (32.3 ft²)
RECONDITIONED, 20-300 Kg/sq m/hr shortpath evaporator. System working pressure 20x10-1x10 mbar. System consists of (1) Leybold KD300, 32.2 sq ft (3 sq meter) 316SS vert wiped film evaporator, SN 1982/1. W/53.8 (5 sq meter) int condenser. jkt rated 6 bar @ 250 deg C. Condenser rated 6 bar @ 80 deg C. (3) wiper strands, wiper speed 106 rpm. Unit driven by 2 KW, 3/50/240/415 volt, 105/1445 rpm non-flameproof geared motor. Mechanical seal.
Diameter: 500 mm (19.7 in). Height: 3,800 mm (149.6 in). Orientation: Vertical. Pressure: 2 bar (29 psi). Temperature: 200 °C (392 °F). Internal Condenser: Yes. Internal Condenser size: 5 m² (53.8 ft²). Vacuum: Yes. Mechanical Seal on Shaft: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Luwa SMS
Condition: Used
Material: Stainless Steel 316
Evaporation Rate: 11.3 kg/h (25 lb/h)
Total Heat Transfer Surface Area: 0.5 m² (5.4 ft²)
wiped film evaporator/filmtruder body only. jkt rated 227 psi @ 392 deg F.
Diameter: 152.4 mm (6 in). Height: 1,829 mm (72 in). Pressure: 6.9 bar (100 psi). Temperature: 350 °C (662 °F). Vacuum: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Luwa SMS
Model: D-850/4700/10
Condition: Used
Material: Stainless Steel 316
Evaporation Rate: 267.6 kg/h (590 lb/h)
Total Heat Transfer Surface Area: 11 m² (118.4 ft²)
Jkt rated 13 bar @ 220 deg C Shell 850mm (34") dia x 4800mm (15.8') long, Rotor driven by 30 KW, 3/50/380 volt, 260 rpm output speed.
Diameter: 850 mm (33.5 in). Height: 4,800 mm (189 in). Orientation: Horizontal. Pressure: 0.5 bar (7.3 psi). Temperature: 220 °C (428 °F). Vacuum: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Luwa SMS
Model: LB-0050
Condition: Used
Material: Stainless Steel 316
Evaporation Rate: 11.3 kg/h (25 lb/h)
Total Heat Transfer Surface Area: 0.5 m² (5.4 ft²)
jacketed wiped thin film evaporator with column and condenser pressure internal -1/3 bar @ 250/350 deg C (38ltr) jacket 29.6/26.9 bar @ 250/350 deg C (6ltr) s/steel jacket on straight side only, rotor belt driven by 1.5 kw 3/50/500 volt 710rpm Exd 3nG5 motor, Crane 109 mechanical seal, evaporator with (1) 300mm diameter x 1.8m high 316L s/steel jacketed packed column, manufactured by Dynamite Nobel, fabrik #521, pressure internal: 13 bar + vak @ 200 deg C (140ltr), jacket: 8 bar @ 200 deg C (30ltr), internal coil 8 bar @ 200 deg C (2.5ltr), bolt flat top, weld dsihed bottom, 300mm diameter x 1020mm high packing section, Sulzer packing, (1) 1.2 sqm 316L s/steel (1.4571) tube, shell and head vertical jacketed heat exchanger, pressure tube side: 6 bar @ 200 deg C (40ltr), shell side: 3 bar + vak @ 200 deg C (50ltr), jacket: 8 bar @ 200 deg C 925ltr), (34) 25mm diameter x 2mm x 2.5m long 316L s/steel tubes, shell 250mm diameter x 2140mm total length, (1) dished head, (1) flat bonnet head, all parts are TUV certified
Diameter: 180 mm (7.1 in). Height: 1,400 mm (55.1 in). Orientation: Vertical. Pressure: 3 bar (43.5 psi). Temperature: 350 °C (662 °F). Vacuum: Yes. Mechanical Seal on Shaft: Yes.
Type: Evaporator
Subtype: Wiped/Thin Film
Manufacturer: Luwa SMS
Model: NL-430
Condition: Used
Material: Stainless Steel Other
Evaporation Rate: 97.5 kg/h (215 lb/h)
Total Heat Transfer Surface Area: 4 m² (43.2 ft²)
wiped film evaporator. Jacket rated for Rated for 150 psi at 381 degrees F. Stainless steel rotor belt driven by a pully and motor. Diameter of body section jacket 19.2". Shell wall thickness 0.393 thick, Jacket wall thickness is 0.275" thick. Empty weight 3,400 lbs.
Diameter: 488 mm (19.2 in). Height: 3,512 mm (138.3 in). Orientation: Vertical. Vacuum: Yes.