Pea Starch Processing Line For Pea Extract Processing

System Flow Chart

Technical description

1. Silo storage unit

The purchased peas are poured into the raw material receiving hopper through the dump truck, and the hopper is equipped with a dust removal system, and the volatilized dust is collected by the dust recovery system. The peas are sent to the bucket elevator through the scraper scraper under the silo, and the peas are lifted into the silo by the bucket elevator. The scraper at the top of the silo enters the corresponding silo for storage. The storage system is equipped with ventilation and dehumidification and temperature control systems to ensure the safe storage of peas and prevent mildew.

2. Pea cleaning unit

The pea cleaning unit plays a vital role in the entire production line and has a key impact on the extraction rate of the product and the final quality of the product. Complete and clean peas enter the extraction system, which can minimize the operating load of the extraction and separation equipment in the latter stage. Strict screening and cleaning equipment configuration can obtain clean pea raw materials.

3. Pea peeling unit

In the process of dry pea processing, pea peeling is very important for protein extraction and pea starch extraction. It can reduce the impurity content in the product and improve the product purity. Lighten the load for subsequent separation equipment to achieve the best product quality.

Efficient peeling rate and low crushing rate ensure product purity and extraction rate. In the production process, high-efficiency peeling and separation equipment is used to separate the hulls from the system.

4. Bean skin collection and crushing unit

The bean skins from the air delivery and kernel skin separation system are collected and transported into the bean skin warehouse for temporary storage. The husks are then crushed and packaged to be sold as feed. There are also some customers who do not need to pulverize the bean husks, and these can be directly packaged and sold.

5. Pea crushing unit

The dry pea processing production line needs to directly dry pulverize the peas into soybean powder, and then separate and purify the components from the soybean powder. Therefore, the pulverization of peas is also related to the ease of extraction and separation of each component of the final product. Pulverizing too finely will bring difficulties to the operation and separation of the back-end equipment, and pulverizing too coarsely will also affect the yield of each active ingredient.

The cleaned bean kernels are evenly metered into a high-efficiency pulverizer to thoroughly pulverize the bean kernels to release starch and the like. The pulverized soybean meal is uniformly collected by the powder collection system into the water-powder mixing tank, and water is added for rehydration. The crushing system is equipped with a dust recovery system to recover dust and ensure discharge.

6. Protein separation unit

Pea protein extraction adopts alkali-soluble acid precipitation at the isoelectric point to extract the protein from the slurry. At the same time, heating flocculation is used to flocculate the protein from the solution. The components are then separated by relevant solid-liquid separation equipment.

7. Protein extraction unit

The dissolved protein needs to be precipitated from the solution by isoelectric precipitation and thermal flocculation to form a solid, and then separated by a decanter centrifuge to obtain the final protein product.

8. Protein sterilization drying unit

The protein extracted by the protein extraction unit needs to be dried into the final protein product. Before drying, it also needs to go through processes such as sterilization and deodorization to meet the factory specifications of the final product.

The protein from the neutral tank is pumped out by the pump, and the material is further heated by the steam ejector, and the heated protein enters the coil for thermal insulation and sterilization treatment, killing the microorganisms in the protein and ensuring the hygienic requirements of the product. The sterilized material enters the flash tank, and the material is cooled, concentrated and deodorized.

The protein from the flash tank enters the homogenizer, and the protein is homogeneously emulsified by the homogenizer, so that the protein is fully and evenly dispersed. Then enter the spray dryer to dry the protein.

9. Protein storage packaging unit

The dried protein powder is sent to the powder silo for temporary storage. After the protein comes out of the powder silo, the protein is sieved by a safety sieve to remove foreign matter and large particles in the protein powder to achieve the required fineness of the product. The sieved protein powder is packaged into a finished product through a packaging machine. After weight inspection and foreign matter inspection, it is stored in the warehouse.

10. Starch extraction unit

The solid phase from the decanter is a mixture of starch and fiber, which still contains a small amount of protein. It needs to be diluted with water in the solid phase tank, and the diluted solid-liquid mixture enters the decanter centrifuge. After the separation and purification of the decanter, part of the protein was recovered again. The outgoing liquid phase water is reused as reclaimed water to the production line, and the solid phase enters the screening unit to separate starch and fibers.

11. Screening unit

The solids from the decanter are diluted and then enter the four-stage series centrifugal sieve starch extraction system, and the starch and fibers are separated by centrifugal sieving. The separated fibers do not contain free starch, and the fibers are then dehydrated and dried. The outgoing starch milk enters the lower starch refining and purification system.

The extraction unit is a centrifugal sieve group consisting of four centrifugal sieves, each of which is equipped with a fiber pump and a defoaming pump. The slurry enters the first-stage extraction screen, and 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 into the second stage centrifugal sieve, the starch-containing water 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.

12. Fiber dehydration drying unit

The fibers from the decanter need to be further dewatered before entering the dryer for drying to obtain the final commercial fiber product.

The fibers from the centrifugal sieve are pumped into a decanter centrifuge to dehydrate the fibers. The dehydrated fibers are fed into a fiber drying dryer by a screw to dry the fibers. The air dryer further dries the dewatered fibers to the moisture content required for commercial fibers. 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 fibers are transported to the feeding screw with a hopper, and are transported to the feed port of the airflow dryer through the screw. The fibers enter the cyclone separator along the air duct along with the hot air in the airflow dryer, and the dried fibers are placed in 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 fibers enter the wind shutoff through the cyclone conveying screw below the cyclone. The specially designed large-bend airflow dryer has been proved by practice that its energy consumption is reduced by about half compared with the average level.

The fiber enters the air delivery system through the air lock, and the fiber is sent to the final product warehouse through the air delivery. Before entering the warehouse, use a vibrating screen to remove the coarse particles in the fiber, so that the fineness of the finished fiber can meet the standard. The screened fibers directly enter the stainless steel bin for temporary storage.

The fibers in the fiber bin go through an automatic packaging machine to pack the fibers into 25/50 kg bags.

13. Starch refining unit

The starch separated from the centrifugal sieve group contains fine fibers and proteins, so further purification and purification are required to separate the fine fibers and proteins.

The crude starch milk first enters the disc centrifuge, and the crude starch milk is separated by the disc centrifuge to remove most of the fibers and impurities, and the starch milk is also concentrated. The waste liquid discharged from the disc machine contains many fine fibers, and this part can be reused by recycling part of the water through solid-liquid separation, or it can be directly discharged into sewage treatment.

The starch milk from the disc machine enters the starch washing cyclone, and the process water is pumped from the other end of the cyclone station to wash the starch in a counter current 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 second stage. The recovery cyclone station recovers the starch contained in it. The waste liquid overflowing from the recycling cyclone station is further reused as recycled water. The starch milk from the washing cyclone station is pumped into a stainless steel starch milk storage tank with an agitator.

Clean process water is added from the last stage of the cyclone station, mixed with starch milk for washing, and then the overflow is mixed with the previous stage of starch milk, washed and separated, so that the first-stage counter current washing makes fibers and cell fluids discharge with 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 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.

14.Starch dehydration unit

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 it 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 contacts 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.

15. Starch drying unit

The dehydrated starch is screwed into a starch drying dryer to dry the starch. 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, and the starch enters the cyclone separator along the air duct along with the hot air in the airflow dryer, and the dried starch is in 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 specially designed large-bend airflow dryer has been proved by practice that its energy consumption is reduced by about half compared with the average level.

The starch enters the air conveying system through the air shutoff device, and the starch is sent to the final product warehouse through air conveying. Before entering the warehouse, use a vibrating screen to remove the coarse particles in the starch, so that the fineness of the finished starch can meet the standard. The sieved starch directly enters the stainless steel silo for temporary storage.

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