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/Sweet Potato Starch Processing Line Used For Extraction Of Starch From Sweet Potato

Sweet Potato Starch Processing Line Used For Extraction Of Starch From Sweet Potato

Product Advantages

1.Combining the mature European technologies and domestic production in high standard, makes our system of the best performance-price ratio.

2.Fully closed and modular structure makes compact layout, resulting in a sharp reduction of installation time.

3.Steady running control system range from fully automatic to manual, catering to customers’ needs for various systems.

4.By utilizing 3D design software, detailed drawings can be provided for customers’ facilitated installations.

  • Details

Technical description

1. Raw material receiving unit

The raw material receiving unit is the first link of sweet potato starch processing. The main purpose of this unit is to preliminarily remove impurities and store the sweet potato in the raw material storage tank smoothly.

The fresh sweet potatoes are weighed by the weighbridge and then pulled to the sweet potato storage tank. First, the sweet potato raw materials are sieved through a vibrating screen to remove part of the sand and gravel in the sweet potatoes. The clean sweet potatoes fall from the vibrating screen to a belt conveyor, and the sweet potatoes are transported into the potato raw material storage tank through the belt conveyor. The sand, gravel and impurities under the sieve are loaded on the truck and transported by the farmers. In the process of unloading sweet potatoes, it is best to use a special shovel to ensure that the sweet potatoes remain intact. The storage time of sweet potatoes should not exceed one week, and the longer the storage time of sweet potatoes, the more unfavorable the production of starch.

The most important part of this unit is to allow sweet potatoes to remove the sand and gravel impurities mixed in the harvest. The vibration of the vibrating screen can make the sand and gravel stick to the sweet potatoes fall off. Preliminary sand removal and impurity removal can reduce the burden on the machines in the subsequent stone removal and cleaning section. It should be noted that in the process of purchasing sweet potatoes, the potatoes should not be damaged. Broken sweet potatoes are easy to rot, and the rotten potatoes can easily infect the surrounding sweet potatoes. Poor sweet potato raw materials have a great impact on starch quality.

 

2. Raw material conveying unit

The main purpose of this unit is to transport the sweet potatoes in the sweet potato yard into the potato pump through the water flow, and then transport them to the stone remover through the launder. In the process of conveying, the sweet potatoes are continuously rolled and rubbed in the water flow, which can peel off the sticky soil on the sweet potatoes, which has a good cleaning effect.

In the production of starch, the sweet potatoes are flushed into the flow tank with flushing water, and the raw materials enter the potato pump together with the water. The sweet potatoes from the potato pump enter into the stone remover evenly along the flow trough.

The smoothness, shape and slope of the flow trough play a crucial role in the flow of sweet potatoes. The bottom of the flow trough we designed is semi-circular and the slope is reasonable, which can well transport the sweet potatoes into the stone remover evenly.

 

3. Stone removal cleaning unit

A clean raw material plays an important role in the processing of sweet potatoes, so the stone removal and cleaning unit is the most important in the pretreatment stage of the raw material. This unit is to completely remove the sand, gravel, soil and other foreign objects in the sweet potato, and store the cleaned sweet potato in the sweet potato temporary storage hopper.

The sweet potatoes are transported by water flow into the reverse spiral stone remover for cleaning and stone removal. The rotary drum of the stone remover is divided into two parts: the sand discharge drum and the screen drum; the screen drum wall is provided with screen holes according to the process requirements. In addition to the sand particles whose diameter is smaller than the screen hole when the stone machine is working, it will leak from the screen hole to the screen cylinder. Under the action of the reverse push spiral belt on the outer wall of the screen cylinder, it will advance in the opposite direction of the water flow and fall into the sand collection before the stone remover. In the tank, the sand discharge drum is discharged to the stone miscellaneous discharge port through the sand discharge plate. Stones, bricks and other heavy debris with larger diameters will stick to the inner wall of the screen cylinder after entering the screen cylinder because they do not float. Under the push of the reverse spiral belt in the screen cylinder, they will advance against the direction of the water flow and fall into the sand discharge drum. Inside, it is excluded together with the collection of sand particles with smaller diameters.

The sweet potatoes after stone removal pass through the flow tank and the dewatering drum with the water flow, and then are sent to the drum cleaning machine to clean the sweet potatoes. The drum washer works at a low liquid level to thoroughly clean the sweet potatoes. The rotation of the drum makes the sweet potato tubers rub against each other strongly to achieve the washing effect. At the same time, clean washing water is fed from the discharge port of the washing machine. Water and potato peels are discharged. The cleaning water can be transported by the circulating pump to the flow tank as flushing water to achieve recycling.

After the washed sweet potatoes come out of the drum washing machine, they fall to a mesh belt conveyor with spray. There are several rows of nozzles evenly distributed on the mesh belt conveyor, and fresh water is sprayed on the sweet potatoes through a certain pressure to further take away the dirty water on the surface of the sweet potatoes. The cleaning water can be drained into the collection tank under the conveyor belt through the mesh belt, and transported to the discharge port of the cleaning machine by the circulating pump to achieve recycling. The final clean sweet potato is sent to the sweet potato temporary storage bin through the spraying screw conveyor. The volume of the sweet potato bin is generally designed to store one to two hours.

 

4. Filing unit

The filing unit is the most important link affecting the extraction rate of sweet potato starch. The high-efficiency filing machine can completely release the starch granules in the sweet potato cells, ensuring that the content of bound starch in the potato residue is reduced to a minimum.

The raw materials from the washing unit are conveyed into the crusher through the belt conveyor and cut into pieces, and the crushed sweet potato pieces fall into the temporary storage bin. A screw conveyor is installed at the bottom of the raw material warehouse, and the crushed sweet potato pieces are transported into the file mill through the screw conveyor to crush the sweet potatoes. The screw conveyor adopts frequency conversion control to adjust the feeding amount. During production, the filing and grinding machines are used and prepared, and the filing and grinding strips are replaced alternately to ensure the continuous production of the production line.

The filing machine rasps the sweet potato pieces into potato pulp, which includes free starch granules, fibers, fibers containing bound starch, and cell fluid (containing solubles such as protein, sugar, and minerals). It needs to be diluted with process water during the filing and grinding process. After filing, the potato pulp enters the collecting tank through the screen under the filing machine and flows into the potato pulp barrel. A slurry pump is installed at the bottom of the potato slurry bucket, and the potato slurry is pumped into the desander through the slurry pump to remove sand from the sweet potato slurry.

Since filing efficiency (percentage of free starch available) is critical to process yield, filing machines are specially designed to achieve the highest possible filing efficiency.

 

5. Sand removal unit

The sweet potato slurry obtained by filing is pumped into the desander cyclone by slurry pump. The material with a certain pressure enters the desanding cyclone along the tangential direction. In the cyclone, the sweet potato pulp rotates at a high speed, and the starch and fibers of the light phase overflow from the top, and the sand of the heavy phase is discharged from the bottom. There is a sand accumulating tank under the ceramic swirl tube. The sand accumulating tank is connected with pressure backwash water to ensure that the starch will not be lost from the bottom flow port, and the discharged sand particles are regularly discharged through two airbag valves.

The specially manufactured ceramic swirl tube is durable and the uniquely designed air bag valve can automatically discharge the sand particles at regular intervals. Good sand removal effect can protect the downstream centrifugal screen mesh.

 

6. Extraction and potato residue dehydration unit

Centrifugal extraction is another key unit of the whole production line that affects the yield of sweet potato starch. A good centrifugal sieve and process can extract all the free starch broken from the sweet potato cells.

The extraction unit is a centrifugal sieve group consisting of three centrifugal sieves, each of which is equipped with a fiber pump and a defoaming pump. The sweet potato pulp from the desander enters the first-stage extraction screen. Under the centrifugal force of the high-speed rotation of the screen basket, the starch passes through the screen and the potato residue is left on the surface of the screen basket and thrown out. There is always a certain pressure of flushing water on the front of the sieve basket, which is sprayed from the nozzle to make the potato dregs roll continuously, so that the starch in the potato dregs can be fully separated. The back of the screen basket is also designed with flushing water, and the back flushing water on the back is regularly turned on to ensure that pectin and potato residues do not block the screen. The starch milk is pumped to the cyclone station for washing by the defoaming pump, and the potato residue is pumped to the second-stage centrifugal screen by the fiber pump. The potato dregs containing a certain amount of starch are further extracted to starch in the second-stage centrifugal screen, the water containing starch enters the process water of the extraction system through the defoaming pump, and the potato dregs continue to be pumped to the third-stage extraction sieve through the fiber pump. Similarly, the third-stage extraction sieve still performs starch extraction, and the sieve still enters the process water of the extraction unit, while the potato residue is pumped to the potato residue dehydration unit.

Each centrifugal screen is specially designed with a high-pressure flushing water system on the back. The high-pressure rinse water on the back can rinse the screen basket to prevent impurities such as pectin or fibers from clogging the screen. At the same time, the centrifugal screen is also specially equipped with a front high-pressure cleaning water system, which can further wash the screen blue like the back high-pressure cleaning water system to ensure the transmittance of the screen blue. So that the centrifugal screen can run normally and stably for a long time.

The special design of centrifugal screen mesh, reasonable design of flushing water system and unique combination of centrifugal screen can ensure that starch can be separated from potato residue to the maximum extent, and ensure that the free starch content of potato residue is reduced to a minimum, almost zero.

  

7. Concentration and refining unit

Concentration refining is the most important unit of the entire production line, and the quality of starch is completely guaranteed in the cyclone refining unit. The impurities in the starch slurry are completely removed by physical methods, so that it does not affect the quality of starch products.

The starch slurry from the first-stage extraction centrifugal screen enters the multi-stage cyclone washing unit, and the process water is pumped from the other end of the cyclone station to wash the starch in a countercurrent manner. The entire cyclone station can be divided into three parts. First, the starch slurry is dejuiced and concentrated through the concentration cyclone station. The concentrated starch milk enters the subsequent washing unit, and the cell fluid overflowing from the concentrated cyclone enters the two-stage The recovery cyclone station recovers the starch contained in it. Most of the waste liquid overflowing from the recycling cyclone station containing a large amount of fiber impurities is directly discharged, and a small part still enters the process water system of the extraction unit. The starch milk from the washing cyclone station is pumped into a stainless steel starch milk storage tank with an agitator.

The clean process water is added from the last stage of the cyclone station, mixed with the starch milk for washing, and then the overflow is mixed with the previous stage of starch milk for washing and separation. In this way, the first-stage countercurrent washing makes the fibers and cell fluids discharge with the water. Swirl Station. Multi-stage washing can ensure the washing effect of the cyclone station, better remove impurities such as fiber and protein contained in the starch milk, and ensure that the starch milk coming out of the cyclone station does not contain any impurities. In this way, it can be ensured that all indicators of the produced starch meet the standards.

 

8. Dehydration of starch

The water content of the starch milk coming out of the cyclone station is too large to be directly dried. Therefore, the starch milk needs to be dehydrated first to reduce the water content of the starch and can enter the air dryer for drying.

The starch milk is pumped from the starch milk temporary storage tank to the vacuum dehydrator tank with a starch pump, and a water pipe is connected to the starch milk pipeline, and the starch milk is diluted to a certain concentration with process water. The vacuum pump forms a negative pressure in the vacuum drum. When the starch emulsion is in contact with the vacuum drum, the starch slurry is sucked on the drum surface, the filtrate is sucked into the filtrate separation tank and pumped away by the filtrate pump, and the filter cake is scraped off by a scraper , and transport it into the feeding hopper of the air flow dryer with a food-grade conveyor belt. Since the sweet potato starch granules are relatively small, some of the starch granules will be pumped out of the filtrate together with the filtrate. The filtrate will be recycled through the recycling cyclone, and the recycled starch will still be returned to the starch milk tank, and the separated water will enter the Craft Jug.

The vacuum dehydrator has excellent performance, simple and stable operation, and the moisture content of the dehydrated starch can meet the requirements of entering the air dryer.

 

9. Airflow drying unit

The air dryer further dries the dehydrated starch to the moisture content required for commercial starch. The air is heated to the required temperature by the heat exchanger through the filter screen, and the hot air is sucked into the dryer by the induced draft fan. The dehydrated starch is transported to the feeding screw with a hopper, and is transported to the feed port of the airflow dryer through the screw. The starch enters the cyclone separator along the air duct along with the hot air in the airflow dryer, and the dried starch enters the cyclone separator. The cyclone separator is separated from the air, and the wet air is discharged through the induced draft fan after leaving the cyclone separator. The starch enters the wind shut-off device through the cyclone conveying screw below the cyclone separator. The special design of the large-bend airflow dryer has been proved by practice that its energy consumption is generally lower than the average level.

 

10. Starch screening unit

The starch enters into the starch uniform silo through the air shutoff device, and then the starch is conveyed into the bucket elevator through the lever feeder under the uniform silo, and the bucket elevator conveys the starch to the two-way conveying screw. If the moisture content of the starch does not meet the requirements, the starch is returned to the uniform bin through the bidirectional conveying screw; if the moisture reaches the standard, the starch enters the double-silo vibrating flat screen through the bidirectional conveying screw, and the vibrating screen sieves and grades the dried starch and removes the The gelatinized and coarse particles in the refined starch make the fineness of the finished starch meet the standard. The sieved starch directly enters the stainless steel starch bin for temporary storage. The selected double-silo flat screen specially used for starch has the mesh number of the screen gradually increasing from top to bottom, which ensures the smoothness of starch screening and the fineness of starch.

Adopting a uniform silo can ensure the balance of the product. If the moisture of the dried starch is too dry or too wet, the circulation of the uniform silo will make the moisture meet the standard. Especially when the air dryer is unstable at startup, the uniform silo can ensure that the starch moisture content is evenly up to the standard.

 

11. Weighing Packaging

The starch in the starch silo is packed into 25/50 kg bags by an automatic packaging machine.


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