How does cassava starch production line works ?
Cassava starch is produced by wet-milling of fresh cassava roots in cassava starch production line.A first-rate quality starch can be obtained from cassava using only water and this makes processing of cassava starch suitable for developing country.
Doing Company is professional manufacture the cassava starch production line. The cassava starch production line is full automatic and comprised of 12 work process as below:
Cassava starch production line
1. Raw material receiving unit
Material receiving unit is the first link of cassava starch production line. The primary purpose of this process is the cassava preliminary removing impurity and the smooth storing in inside . Cassava is conveyed to the cassava yard after weighing by wagon balance, and then is conveyed into the cassava storage hopper by forklift.The key of this process is to remove sand and other impurities of cassava during the harvest, the sand stick to the cassava can drop through the screen.
Cassava cleaning machine
2. Cassava cleaning and washing unit
Clean raw materials for cassava processing play an important role, so de-stoning and cleaning unit of pre-treatment stage is the most important. The purpose of this unit in cassava starch production line is to get rid of sandstone, clay of cassava, and to deposit cleaned cassava in the cassava temporary hopper.
Cassava is conveyed into the washer in cassava starch production line, blades washer adopts counter-current cleaning principle. Water flow (used for washing) and the materials movement direction is opposite. Certain level of cleaning water is poured into the cleaning trough, cassava raw materials almost float on the surface of water and move forward through internal trough. The cassava rotates and clashes each other in the water, getting rid of the soil and impurities on the surface of them in the greatest degree.
After washing,the cassava fall into the crusher through the belt conveyor to carry on the preliminary slicing of cassava tuber.Cassava is cut into small piece to ensure crushing efficiency of crushing machine.
Cassava washing machine
3. Cassava crushing unit
After washing, the cassava fall into the crusher through the belt conveyor to carry on the preliminary slicing of cassava tuber. Cassava is cut into small piece to ensure crushing efficiency of crushing machine.
Crushing process is the most important link in cassava starch production line which influence cassava starch extraction rate. Efficient crushing machine can release cassava starch particles from cassava cells thoroughly, guaranteeing the combination starch content of cassava residue to the minimum.Cassava slurry below the crushing machine is pumped into de-sanding unit with a fiber pump.
Cassava crushing machine
4. Centrifugal extraction unit
Centrifugal extraction unit is another key process of the whole cassava starch production line to influence cassava starch extraction rate, good centrifugal screen and process technology can help extract out all the free starch from broken cassava cells.
Extraction unit is a centrifugal sieve group composed by three centrifugal sieves, each centrifugal sieve equips with a fiber pump and a de-foam pump. Cassava slurry came from de-sander enters into the first level extraction sieve, under the action of centrifugal force of sieve basket high speed rotating.cassava starch goes through the screen, and the residue stayed on the surface of sieve basket was thrown away lately.
Starch milk is pumped to hydro-cyclone for washing by de-foam pump, and cassava residue is pumped to the second stage centrifugal sieve by fiber pump in cassava starch production line. Cassava residue containing some cassava starch is extracted starch further in the second centrifugal sieve, starchy water is pumped into the process water of the extraction unit by de-foam pump, cassava residue sequentially is pumped to the third stage extraction sieve by fiber pump. Similarly, the third stage extraction sieve still carries on starch extraction, screened materials still enter the process water of extraction unit, and cassava residue is pumped to cassava residue dehydration unit.
5. Cassava residue de-watering unit
Cassava residue pumped from the extraction unit proceeds with de-watering by a centrifugal sieve, the working principle is the same as an extraction sieve. Cassava residue finally is delivered out of the workshop through a screw conveyor, and the water of cassava residue still returns to process water system of extraction unit in cassava starch production line.
6. Fine fiber separation unit
Fine fiber separation unit is assorted unit to concentration and refining unit; its main purpose is to reduce working pressure of hydro-cyclone in cassava starch production line. When fiber and impurities in the starch slurry are too much, fine fiber sieve can be opened to discharge part of the fine fiber of hydro-cyclone out of cyclone system to ensure overmuch fine fiber can be discharged from hydro-cyclone.
Waste water containing fine fiber came from the first level of overflow of hydro-cyclone enters directly into inlet of the fine fiber sieve, starch containing in fine fiber is extracted through the fine fiber sieve as extraction unit; the starchy cell sap and starch slurry extracted from the first level of starch extraction sieve together re-enter into the hydro-cyclone, the separated fine fiber directly enters into the cassava residue spiral discharge of dehydration sieve or into the cassava residue de-watering unit together with the cassava residue came from extraction unit.
Fine fiber separation unit plays a good auxiliary function in the working of hydro-cyclone in cassava starch production line; it can discharge large amount of fine fiber of hydro-cyclone out of cyclone system in time, at the same time it can discharge cell sap on the poor raw material situation.
Fine fiber sieve
7. De-sanding unit
Cassava slurry is then pumped into the de-sand cyclone through a fiber pump in cassava starch production line. Materials with certain pressure enter into the de-sand cyclone along the tangent, cassava slurry in the hydro-cyclone is rotating with high speed, light starch and cassava residue etc. overflow from the top of the hydro-cyclone, while heavy sand is discharged from the bottom of the hydro-cyclone. At the bottom there has a sand catch pot which connects pressure recoil water to guarantee starch not being discharged from underflow outlet, and the sand in the sand catch pot is discharged regularly through air valve.
8. Concentrating and refining unit
Concentrating and refining unit is the most important one of the whole cassava starch production line, starch quality can be guaranteed fully in hydro-cyclone refining unit. Impurities of starch slurry will be eliminated thoroughly through physical method, without influencing the quality of starch product.
Starch slurry sieved from the first stage centrifugal sieve enters into the 18 grades concentration hydro-cyclone washing unit, process water pumped from the other end of the hydro-cyclone washes starch with counter current method. The whole hydro-cyclone can be divided into three parts, first starch slurry is de-watered and concentrated through concentrated hydro-cyclone, concentrated starch milk enters into the subsequent washing unit, and then overflowed cell sap enters into two-stage recovery hydro-cyclone for recycling contained starch. The most effluent overflowed out of hydro-cyclone, containing abundant fibrous impurities is discharged directly; a small minority enters into the process water system of extraction unit again in cassava starch production line. Starch milk of hydro-cyclone is pumped to a stainless steel starch milk storage tank with blender.
Clean process water adds from last stage of hydro-cyclone to mix and wash starch milk, then the overflow mixes with former stage starch milk, washes and separates. Series of counter current washing like this makes fibers and cell sap are discharged out of hydro-cyclone along water. Adopting 13-stage washing can guarantee washing effect of hydro-cyclone, which could remove fiber, protein contained in starch milk better, in this way, the starch milk came from hydro-cyclone has no impurities at all.
9. Starch de-watering unit
Starch milk with high moisture content came from hydro-cyclone can’t directly dry, so first starch milk needs de-water to make starch moisture content be about 38~40% in cassava starch production line.
When centrifuge filter de-watering and after the rotating drum working at a full speed, the inlet valve automatically and periodically opens, the suspension enters into the rotating drum with full speed through the feed pipe, solid content of the suspension is evenly distributed on semi-auto surface by centrifugal force, and liquid is mostly separated by centrifugal separation through filter screen and drum wall holes, discharged through the tangential liquid outlet of machine housing; along with the extension of the feeding time, the thickness of solid material layer inside the drum is also increasing. reaching the scheduled time, inlet valve shuts down automatically and feeding stops. After a certain period of feeding stop time, the flush valve automatically opened, washing water sprays on solid content through a washing water pipe, the flush valve automatically closes after a certain period of time; under conditions of continuous full speed rotating of the rotating drum, liquid content is constantly separated, solid content is fully dried after a certain time of continuous separation in cassava starch production line.
At this time scraper cuts with rotation into solid material layer along the radial direction of the rotating drum, the removed materials to be delivered out of machine through the aggregate trough along the inclined discharge hopper, scraper resets after the discharging in cassava starch production line. Meanwhile, flush valve opens, washing water cleans filter screen to make it reuse; washing filter ending means that a complete operational period is finished, at this moment feeding valve opens again to enter the next cycle period. Filter cake is scraped by scraper and conveyed into the feeding hopper of the flash dryer by the belt conveyor of food-grade.
10.Air drying unit
Air dryer will further dry the de-watered starch to commodities starch required moisture content. Air passes through the filter and is heated to the required temperature by the heat exchanger, and then hot air is sucked into the flash dryer by draught fan. De-watered starch is conveyed to the feeding spiral with hopper, and then conveyed to the feeding inlet of flash dryer through spiral conveyer; starch enters into the cyclone separator through air pipe along with hot air of flash dryer; dried starch separates with air in cyclone separator; wet air leaves cyclone separator and discharged through draught fan. Starch enters into finished product spiral through air locker below the cyclone separator. The big bend pipe flash dryer by special design practically proves that the energy consumption reduces 30-40% than average in cassava starch production line.
Starch drying machine
11. Screening and storage unit
Starch is conveyed to the starch well-distribution bunker by finished product spiral, and then the starch is conveyed to the bucket elevator through the leveraged feeder starch below the starch well-distribution bunker, finally the starch is conveyed into the two-way conveying spiral in cassava starch production line. Starch returns to the starch well distribution bunker through two-way conveying spiral, if the moisture content of starch can’t reach standard; starch enters into the double storehouse vibrating sieve through two-way conveying spiral, if the moisture content of starch can reach standard. The vibrating screen sifts and clarifies dried starch, removes gelatinous and thick grain of the fine starch, makes the fineness of the finished product starch meet the standard. The starch screened enters directly into the stainless steel starch bunker for temporary storage. The sieve mesh number of the selected double storehouse
vibrating sieve its sieve mesh is increasing from top to bottom gradually, and guarantees no blockage of the starch screening and the fineness of starch in cassava starch production line.
Adopting the starch well-distribution bunker can guarantee the balance of the finished product; starch could reach the moisture standard through the recycling of the starch well-distribution bunker, if the dried starch is too dry or too wet. Especially when the flash dryer is under the unstable starting up condition, the moisture content of starch can be ensured to reach standard equally through the starch well-distribution bunker.
12. Weighting and packing unit
The final step in cassava starch production line, the starch of storehouse will be packed into 25 kg or 50 kg per bag by automatic packing machine.
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