Solvent extractor for Cotton seeds oil
1.2.Process Description
1.2.1. Continuous leaching
Soybean extruded material / oil sunflower pre-press cake from the feed scraper seal auger fed into the hopper on the leaching, level with automatic control, material leaching vessel from the feed port to the discharge port to run a week between the inlet and outlet port for the spray by decreasing the concentration of the mixture of oil, before entering the drain section, and then fresh solvent spray, wet drained after meal is discharged from the bottom of the extractor into a wet meal scraper. Full mixed oil pump into the suspension by a full hybrid splitter, filter further remove impurities in the oil mix.
High temperature desolventizing
Discharged from the bottom of the leaching wet meal, after meal wet blade into the upper part of the pre-DTDC desolventizing machine delamination, with indirect steam heating, so that part of the solvent was evaporated, meal temperature rise; pre-meal falls off after a pre-steamed delamination rely on secondary steam distilled delamination pre meal solvent was evaporated off, and then fall into the steaming meal delamination, which leads to direct steam, the steam from the bottom of the hole directly injected into the meal, the meal solvent to steam distillation to the solvent was removed, part of the steam condenses in the meal, play an active role in the destruction of enzymes meal; lower dry layer desolventizing meal fall by the valve, the air blown by the fan through the air heater dry layer into a hot air after at the bottom of the meal is dried, wet air from the upper portion of the dry layer withdrawn from the fan, separated by the cyclone brought the meal after meal emptying, meal powder fell out through the bottom of the cyclone and then by lifting the blade meal meal horizontal scraper to the meal libraries.
1.2.2. Evaporation stripped dry
After centrifugation, the whole mixture of oil into the first evaporator, DTDC secondary steam as a heating source of the first evaporator, the solvent was distilled off from the top of the first vapor-liquid separation chamber of the evaporator to the condenser into the evaporator and evaporated condenser vacuum is maintained by low vacuum jet pump. The concentrated oil mixture from the bottom of the separation chamber is discharged of the first evaporator, after mixing the oil into the second heat exchanger evaporator, an evaporator of the second indirect steam heating. The solvent was evaporated and the first evaporator vapor distilled solvent vapor together into the evaporative condenser. A first evaporator and a second evaporator under the same vacuum. Further concentration of the mixed base oil outflow chamber separated from the second evaporator by the pump into the upper portion of the stripping column, the bottom of the stripper through the direct steam, removing the remaining solvent mixed in the oil mixture into the stripping vapor is condensed , a stripper, a condenser vacuum is maintained by a high vacuum jet pump. Stripper bottom has a level control device to ensure that the liquid seal and stable flow of refined oil, crude oil extracted by stripping pump out and dried under vacuum, cooled into temporary storage tanks.
1.2.3. Solvent cooling and water separation
No condensate stripping vapor condenser pumped by high vacuum jet pump to the first evaporator shell, evaporative condenser not trap body jet by low vacuum pumping into the first evaporator shell, the shell is not the first evaporator condensing steam body into the bottom of the economizer, heat and fresh solvent, yet condensed vapor condenser and then into the DT further condensed. Evaporating condenser condensate stripper condenser condensate is conveyed by the pump to the sub-tank water separation. The first evaporator, economizer shell condenser condensate and other self-condensate flows into the tank, the water separation, the solvent into the solvent turnover library. After fresh solvent pumped by the economizer heat exchanger into the extractor recycling, points separated wastewater into distilled water tank water tank where the residual solvent evaporated, into the seal pool.
1.2.4. Tail gas absorbing
From non-condensable gas condenser vapor out since entering the absorber bottom, lean down from the tower top spray through the packed bed countercurrent contact with the exhaust solvent absorption, emission and absorption by the exhaust fan from the top of the absorber through the arrester discharge into the atmosphere.
Absorbed the oil-rich solvent pump into the rich and the poor by the rich oil heat exchanger, and then the rich oil heater heated by parsing the upper part of the tower into the tower, the parsing pass into the bottom of the tower direct steam for analysis, gas parsed into the evaporative condensers, depleted oil through heat exchangers - after cooling into the absorber recycle.
1.3. Process and equipment features
- Using towline extractor, the flow of the circulating pump, a good penetration effect, the wet pulp containing dissolved low, in the case of a smaller ratio of the material dissolved residual meal may be guaranteed ≤1.2%, to improve the concentration of the mixed oil, in addition to low moisture containing meal Rong, a significant reduction in the amount of evaporation of the solvent;
-- DTDC desolventizing using VRS technology, greatly reducing steam consumption, while reducing the system's hot air humidity dragon Shaq, Shaq extend the life of the dragon;
-- Using vacuum evaporation, reducing the evaporation temperature; DTDC out by mixing steam and steam jet pump exhaust steam from a steam heating, saving a steam heating steam;
-- The use of energy will not shell a steam trap with fresh solvent indirect heat exchange, reducing heating steam consumption;
-- Paraffin recovery step using a heat exchanger, the High temperature and low temperature lean oil paraffin paraffin-rich oil for heat exchange, a part of the thermal energy savings;
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-- All steam condensate extraction plant collected by pump into the boiler room secondary use;
-- The application of quality trap, can lower steam consumption workshop; while the entire condensate collected by the pump into the boiler room for the boiler recycling, saving water and soft heat boiler;
1.4.Outdoor auxiliary equipment
Outdoor auxiliary equipment including solvents and solvent pump tanks, cooling towers and circulating pump, seal pools.
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