Automatic crude rice bran oil making machinery, continuous crude rice bran oil solvent extraction plant
What is the main process like?
Brief introduction of solvent extraction section:
Solvent extraction process:
The extruded rice bran gets into the extractor through feeding scraper, the materials run a circle from the feed inlet to discharge outlet in the extractor.
Spraying the extruded rice bran with the concentrate diminishing miscella between the feed inlet to discharge outlet. Then before getting into the drain off section, spraying again with fresh solvent, the drained wet meal discharges into the wet meal scraper from the extractorâs discharge grid through kick-out device.
The concentrated miscella gets into the two-stage hydrocyclone from the pump, to remove the powder impurities, finally get into the miscella tank.
Toasting process:
The solvent contained wet meal from extractor are sent to the DTDC desolventizerâs pre-desolventizing layer by scraper through air locker, the bottom is heated by indirect steam to remove part of solvent; then the pre-desolventized wet meal get into the desolventizing layer, there are automatic control on the desolventizing layer to keep certain thickness of materials, then the bottom gets into the direct steam to remove all the solvent, at same time some steam condense in the meal, the moisture content of meal will sectional rise.
The toasted meal falls onto the drying layer quantitative through rotary valve, the drying layer keeps certain materials level, then process the drying procedure, after drying get into the cooling layer to lower down the temperature, finally, it discharge the finished meal through automatic flow controlling gate, then though the scraper to transport the meal to warehouse.
The mixed vapor of solvent and steam that get out from the top of desolventizer through solvent catcher, get into the shell side of first long tube evaporator as the heating medium of first desolventizing miscella.
Evaporation process:
The miscella is sent to the first long tube evaporatorâs tube pass from the miscella tank through first evaporation feeding pump, the mixed vapor of desolventizer is the heating medium for first evaporation. The evaporated solvent gets into the evaporating condenser from the separation room, there are level control device on the separation roomâs outlet conduit to keep the liquid seal, the first evaporator keeps certain residue pressure by low vacuum injection pump, which can make the solvent thant in the first evaporation oil evaporates under the negative pressure, this can lower down the solvent boiling point to improve the working steam use ratio.
The miscella that after first evaporation concentrated, through the second evaporation feeding pump gets into the second long tube evaporator for evaporating, the second evaporation is also negative evaporation, the shell pass is heated by indirect steam, the evaporated solvent vapor gets into the evaporating condenser through the separation room, there are level control device on the separation roomâs outlet conduit to keep the liquid seal, the outlet miscella gets into the steam stripping tower after heated by oil-oil heat exchanger, at same time, the heating steam of second evaporation has adjusting valve group to control the temperature of outlet miscella.
The miscella gets into the stripping tower from top, fall on to the discs, then lower down layer by layer, meanwhile inject direct steam from bottom to remove the residue solvent. There are evaporation condenser at the top of stripping tower, the high vacuum injection pump can keep the stripping tower working under negative pressure, there are liquid level controller installed at the bottom of stripping tower, to make sure the liquid seal and steady flow of product oil, the crude oil draws out from the bottom of stripping tower by pump, then through oil-oil exchanger and crude oil cooler, the crude oil can get into the crude oil tank.
What are the solvent extraction machines like?
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