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Potato starch processing technology

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Potato starch processing and manufacturing technologies

First

Second, raw materials and requirements
Potato raw material has a direct impact on the product quality, yield and equipment and useful life, process data discussed in this paper is

based on the following materials:
The raw materials are potatoes suitable for production of food grade starch, its composition as follows: the minimum ratio of dry matter to

the total weight should be 22.5%; the smallest proportion of the starch content in total weight should be 16%; the largest proportion of the

protein content of the total weight should be 2.7%; the maximum crude fiber percentage of the total weight should be 1.9%; the largest

proportion of the ash to the total weight should be 1.2%.
In addition, the potatoes are also subject to the following conditions:
① potatoes should be processed within one month after the harvest; ② potatoes cannot be exposure to cold; ③ potatoes no germination;

④ l kg potatoes up to the number of15; ⑤the amount of 1kg potatoes deterioration not more than 4%; ⑥Potatoes into the plant without

purification can not contain more than 5% silt and other impurities.


Third, processing technology
3.1 starch production plant
3.1.1 purification and cleaning systems
Potatoes should be removed of impurities as much as possible through the desand spiral purifier before into the flow tank. Generally, potato

starch processing plants store 10-20 days of the potato raw materials. Potatoes delivered to the first-class removing machine to remove stones

and other heavy impurities from the storage by the flow of the water reservoir tank. And taking a

step forward to lifting belt conveyor by water transport to the washing drum. Low-level drum washer for thorough cleansing of the potatoes,

according to soil characteristics we may choose two-level cage potato washing machine or one-level cage potato washing machine and one-level

plate potato washing machine, and then advance the potatoes before grinding hopper by the elevator. Working mode of washing is the

countercurrent washing. Coarse impurities such as leaves, stems, grass, wood, etc. are removed from the curved screen, while the dirty water

purification through the sedimentation tanks.
3.1.2 rasping
The potatoes from the feed storage are transported to the rasping machine by the screw conveyor of the adjustable speed drive motor. Potato

processing plant capacity can be adjusted by the speed of this conveyor. The rotor of the rasping machine with blades to break potatoes,

several sets of parallel rasping machines, one of which spare, replacement for use when changing blades.
3.1.3 Extraction of cell sap
The broken potatoes itself drop into the tank, and pump into the horizontal spiral centrifugal machine to extract potato cells liquid to prepare

protein extracts. Materials after the cell sap extracted, be delivered to starch extraction process by a single screw pump. In the smaller

domestic potato starch factory, the material after grinding to be filed directly to the pump
Starch extraction process.
3.1.4 Starch extraction
Starch extraction consists of a four-level horizontal centrifugal screen extraction system, object under the screen is coarse starch, and material

above the sieve is the fiber residue. Washing water (processing water) separates the fiber residue from the centrifuge screen by the way of

counter-current washing. Then discharge the fiber residue out of the processing workshop after the dewatering in another centrifugal screen by a screw

conveyor. The horizontal centrifugal sieve, is with processing washing connector and the cleaning washing water and the within sanitation washing joint.
3.1.5 Starch concentration
The crude starch from the starch extraction process is pumped to cyclone grit removal station, separating sediment in the starch. Sediment

is collected in the sand device, every few hours discharge once. Starch after desanding concentrates processing in the 7-level cyclone Station.

In the swirl station, the cell fluid is separated from the starch, while starch is concentrated. Concentrated starch as

underflow discharges out of the cyclone station, and is pumped to the starch washing system. The cell fluid drains as the overflow,

and discharges into the sewage tank outside the plant as wastewater. Concentrated butterfly ancient centrifuges, the investment

costs attitude, demanding strict pre-processing.
3.1.6 Starch washing / separation of fine fibers
In order to remove the small fibers from the starch, starch must be divided into two parts: A starch, coarse particle components;

B starch, fine particle composition. This separation is completed by 10-level A starch washing system (multi-stage cyclone).

Concentrated starch from the swirl station of the juice removal is pumped to 10-level A starch washing system; here, B starch

and small fiber are washed out by the washing water (pure water) through the counter-current mode, and separated from the A starch,

purified A starch under the action of pressure, flows into the refined starch cans.
Overflow of A starch washing system, , containing B starch and fine fibers, under the effect of pressure, flows to small-fiber centrifuge

screen, in this, fine fibers are separated and dehydration, separated fine fibers are added to the fiber residue discharge

screw conveyor and convergence with the front fiber residue. Filtrate of the centrifugal sieve flows into B starch concentrator feed

tank by its own weight. Before entering the B starch concentrator, the filtrate goes through a rotating filter to remove the starch

agglomeration, and the concentrator is formed by the cyclone. B starch is sent to eight-level B starch washing system, and washed

by the washing water (fresh water) by the means of countercurrent washing in the 8-level Cyclone. Purified starch flows into the

thick milk cans under pressure, and then into the A starch washing system.
3.1.7 Starch dewatering
The refined starch is dehydrated by the filter of "residual cake" type, dehydrated starch is transported to the starch by the screw conveyor.
Drying process, is by air drying machine, and then weighing and bagging.
3.2 Protein Recovery Plant
3.2.1 Protein recovery system
The cell fluid isolated from decanter in potato starch plant, is pumped to the defoaming tank in the protein recovery plant. Cell sap in the

defoaming tank is degassed with form of the liquid settlement. Light items discharge through the top of the tank, and are condensed by the

defoaming fans by mechanical mode. Liquid separates from the air in the cyclone. Underflow of the cyclone returns to the defoaming tank.

Using two defoaming tank, allowing one to wash, another maintains the work.
The cells sap after the degassing is pumped and delivered to a pre-heating tank in the condensation process, and directly contact heated by

Flash steam. Use an indirect condenser for the condensation of the remaining flash steam. Cell fluid after the pre-heating is pumped to

the condensation process. Before the rally, the cell solution is added hydrochloric acid to reduce pH. Heat the cell s

ap by direct injection of steam to unite. Under these conditions, cohesion protein becomes insoluble components in the cell fluid. Cohesion

protein cools in a flash condenser. And be stored in the storage tank. Cohesion protein isolated from the Decanter dehydration. Dehydrated

protein is transported to the flash drier for drying. Decanter overflow is the waste water, be sent to heat recovery system (plate heat

exchanger) for cooling. Most of the recovery heat is used for air pre-heating of the protein dryer.
4 Equipment
A: air transportation equipment of the reservoir; B: potato washing, enhancing and transportation equipment; C: starch plant process equipment.
1. Screw Conveyor: for conveying potatoes to the shredded machine.
2. Rasping machine unit: for the purification of potato rasping.
3. Single screw pump: used to transport the broken potato to the starch extraction process. The pump has a degassing function.
4. Starch extraction process: used to separate fibers from the broken potatoes and wash fibers by processing water countercurrent mode.
5. Horizontal centrifugal sieve machine: 304 stainless steel. For fiber dehydration.
6. Defoaming pump.
7. Vortex grit removal station: for starch grit remova;.
9. De-juice station for the starch concentrate. Composed by seven-level cyclone.
10. Defoaming pump.
11.10-level Cyclone - starch washing system: for refined starch.
12. Horizontal centrifugal sieve machine: for the fine fiber dehydration.
13. Centrifugal pump: the feed for the starch washing system, 304 stainless steel.
14.6-level Cyclone - starch recovery washing system: used for recovery of starch washing.
15. Centrifugal pump: the feed for the dehydration of starch, 304 stainless steel.
16. 3-level concentrated clarify station: for p starch concentration and clarification.
17. Centrifugal Pump: for delivery processing water.
18. Centrifugal pumps: for transportation of fresh water.
19. Rotary vacuum filter (residual cake type): for the dehydration of refined starch
20. Centrifugal pumps: for transporting the health cleaning fluid.
21. Centrifugal Pump: for the transportation of sealing water.
22. Starch Steam dryer.
23. Cooling, conveying, and screening
24. Automatic weighing and packing machine

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