Sago Starch Processing Line For Sago Extract Processing

System Flow Chart

Technical description

1.  Peeling and cutting raw materials

The raw material peeling and cutting unit is the first link in the processing of sago palm starch. The main purpose of this unit is to cut and peel the sago palm tree segments and cut them into sizes suitable for tablet processing.

The purchased fresh sago palms are about one meter long, neatly stacked in the raw material storage yard, and peeled off the epidermis of the sago palms by a drum-type wood peeling machine.

The peeled sago coconut tree section is transferred to the wood splitting station, and the sago coconut tree section is split into small sections by a special hydraulic wood splitter. The sago palms that are split into small pieces are transported by a belt conveyor to the next process to be broken into pieces.

The key of this unit is that the sago palm is peeled and clean, but the starchy flesh is not damaged, so as to avoid the loss of starch and facilitate the processing of the filing machine.

2.  Raw material crushing and production

The main purpose of this unit is to smash the sago palm trees that have been split into small pieces, so as to facilitate the subsequent filing and grinding.

The small pieces of sago coconut trees conveyed by the belt conveyor from the previous process are processed into small pieces of wood chips by a special wood chip slicer, and then conveyed to the raw material storage bin by the belt conveyor.

3.  Transportation and storage

Stable raw material handling, transportation and storage play an important role in the smooth processing of sago palm starch, so it is crucial to balance production in the pre-processing stage of raw materials to meet the needs of the next process and continue to feed. This unit is to centrally transport the small wood chips processed by the sago palm to the wood chip storage bin through the belt conveyor.

Depending on the production volume, there will be several groups of raw material peeling, cutting, crushing and production working groups working at the same time. The raw wood chips processed by these working groups are first passed through a small belt conveyor and finally collected to a large belt conveyor. transported to the storage bin. Chip storage bins are generally designed to store enough volume for one to two hours of production.

4.  Filing and pumping

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

A specially designed discharge port is connected below the raw material silo, and the discharge port is connected with a speed-adjustable feeding screw. The feeding screw has three outlets, two filer ports and one overflow port. There is a short circuit with a flapper valve between the filer and the feeding screw. When the system wants to feed, first open the flapper valve on the file mill, then adjust the frequency of the feeding screw as needed, and start the feeding screw to start feeding. The filed sago pulp is pumped into the desander unit by a fiber pump.

The specially designed stainless steel filing machine is very easy to operate. The compact file clamping system ensures that the file works in the best position. The loading and unloading of the file is very simple, and it can be done by ordinary people without the use of special tools at all. The stainless steel screen is a one-piece construction and can be replaced without tools, allowing the filer to achieve maximum efficiency and starch yield. The distance between the file and the fixed block is 1~2mm to ensure higher filing efficiency. The capacity of the entire line can be adjusted by means of a speed-adjustable feeding screw.

5.  Cyclone sand removal

The rasped sago slurry is pumped by a fiber pump into a desander cyclone. The material with a certain pressure enters the desanding cyclone along the tangential direction. In the cyclone, the sago palm slurry rotates at a high speed, and the light phase starch and fiber residue overflow from the top, and the heavy phase sand 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.

We use specially manufactured ceramic swirl tube for durability, and the uniquely designed air bag valve can automatically and regularly discharge the sand.

6.  Centrifugal extraction

Centrifugal extraction is another key unit of the entire production line that affects the yield of sago palm starch. Good centrifugal sieves and processes can extract the free starch that is broken from the sago palm 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 sago palm 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 while the fibers remain on the surface of the screen basket and are thrown out. There is a certain pressure of flushing water on the front of the screen basket at all times, which is sprayed from the nozzle to make the slurry continue to roll, so that the starch in the fiber can be fully separated. The back of the screen basket is also designed with flushing water, but the back flushing water on the back is regularly turned on to ensure that pectin and fibers do not block the screen. The starch milk is pumped to the cyclone station for washing by the defoaming pump, and the fiber is pumped to the second-stage centrifugal screen by the fiber pump. The fibers containing a certain amount of starch will further extract starch in the second-stage centrifugal screen, the water containing starch will enter the process water of the extraction system through the defoaming pump, and the fibers will continue to be pumped to the third-stage extraction screen through the fiber pump. Similarly, the third stage extraction screen still performs starch extraction, the undersize still enters the process water of the extraction unit, and the fiber is pumped to the fiber dewatering unit.

The three-stage series centrifugal sieve group can ensure that all free starch is collected into the extraction system, so that the fiber residue does not contain free starch, which fully guarantees the extraction rate of starch.

Unique process design and excellent equipment performance ensure that we can completely extract free starch from fiber residue.

7.  Dehydration of fiber residue

The fiber slag pumped from the extraction unit is dewatered by a centrifugal sieve, which works on the same principle as the extraction sieve. The fiber residue is finally transported out of the plant via a screw conveyor, while the water from the fiber residue is still returned to the process water system of the extraction unit.

8.  Concentrated and refined

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 centrifugal screen enters the 16-stage concentrated 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 concentrated cyclone station. The concentrated starch milk enters the 13-stage washing unit, and the cell liquid from the overflow enters the two-stage recovery cyclone. The flow station recovers the starch contained in it. Most of the waste liquid overflowing from the 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 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 counter current washing makes the fibers and cell fluids discharge with the water. Swirl Station. The thirteen-level 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 there are no impurities in the starch milk coming out of the cyclone station. In this way, it can be ensured that all indicators of the produced starch meet the standards.

9.  Vacuum dehydration

The water content of the starch milk coming out of the cyclone station is too large to be directly dried, so it is necessary to dehydrate the starch milk first, so that the starch water content is about 40%.

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.

Our vacuum dehydrator has excellent performance, simple and stable operation, and the moisture content of starch after dehydration is very low, which greatly reduces the energy consumption of subsequent air drying.

10.  Air drying

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 finished spiral through the air shutoff below the cyclone. 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.

11.  Screening storage

The starch is conveyed into the starch homogenizing silo through the finished product screw, and then the starch is conveyed into the bucket elevator through the lever feeder under the homogenizing 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.

12.  Weighing and packaging

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