CN109833644B

CN109833644B - Powder extraction system

Info

Publication number: CN109833644B
Application number: CN201910264768.2A
Authority: CN
Inventors: 尹越峰
Original assignee: Myande Group Co Ltd
Current assignee: Myande Group Co Ltd
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2024-01-26
Anticipated expiration: 2039-04-03
Also published as: CN109833644A

Abstract

The invention relates to a powder extraction system, which comprises a powder feeder, a powder leacher and a wet dreg conveyor, wherein a plurality of tank body partition boards are connected between front and rear wallboards of the powder leacher, the inner cavity of a tank body is divided into a plurality of soaking tanks, the upper parts of the tank body partition boards are respectively provided with an overflow port, the discharge end of the rightmost soaking tank is connected with a new solution inlet, and the feed end of the leftmost soaking tank is connected with a concentrated solution outlet; a solid material inlet is arranged above the feeding end of the leftmost soaking tank; the discharge end of each tank body partition plate is provided with a guide chute respectively, and the discharge end of the right wall plate of the tank body is provided with a discharge chute and a solid material outlet; the outlet of the powder feeder is connected with the solid material inlet of the leacher, and the solid material outlet of the leacher is connected with the inlet of the wet meal conveyor; the outlet of the new solvent pump is connected with the new solution inlet of the leacher, and the outlet of the concentrated extract pump is connected with the inlet of the solution temporary storage tank through the two-stage hydrocyclone. The powder extraction system has high soaking efficiency, reduces powder scraps and improves economic benefit.

Description

Powder extraction system

Technical Field

The invention relates to an extraction system, in particular to a powder extraction system which can be used for dynamic extraction in the industries of food, environmental protection, chemical industry and the like, and belongs to the technical field of extraction equipment.

Background

Extraction equipment in the market is various and includes fixed bed type, moving bed type, basket bucket type and filter cartridge type. The general principle is that the solid is naturally piled up to form a stable material bed or forced to form a stable material bed, the extracting solution or the washing solution is sprayed from the upper part of the material bed, and the liquid permeates the material layer to complete the mass transfer process.

The equipment has the requirement on the granularity of solid materials, the solid materials are in bulk or sheet form, and certain gaps are reserved among the piled particles so as to be beneficial to the permeation of extraction liquid or washing liquid. When the powder degree in the solid material is too large, the void ratio of the material bed is insufficient, the permeation rate is reduced or the material is not permeated, such as tea seed cake, palm kernel cake and other materials are leached.

In addition, there are requirements for physical and chemical properties of solids and liquids, and some solid components and liquid components are mutually dissolved to form a viscous substance, which blocks a filter screen or a grid plate, resulting in a reduced or non-sustainable effect of the extraction or washing process, and frequent cleaning and maintenance, such as soybean protein concentrate leaching, are required.

The soybean concentrated protein processing raw material white soybean slices or low-denaturation puffed materials contain 8-10% of high-powder-degree scraps, cannot be treated by a conventional leaching process, and are required to be screened out to be treated as leftovers, so that the materials have low economic benefit rate, are not easy to sell and occupy funds.

In the working process of the existing leacher, most of solid materials are in laminar contact with the extraction liquid, and are insufficiently mixed with the extraction liquid; the extraction liquid automatically flows through the fall, the light phase is positioned at the upper part of the liquid layer, short circuit is easily generated in new solution, the extraction power is insufficient, and the extraction efficiency is low; the extraction path is seemingly longer, but the utilization rate of the upper layer screening surface of each leaching unit is very low. In addition, the concentrated extract liquid obtained by the powder extraction system contains a lot of powder particles, and the powder particles flow into a subsequent pipeline to cause the blockage of a liquid outlet pipe valve, so that the concentrated extract liquid must be filtered. After a period of time of traditional filter use, can take place to silt up, liquid flow decline, need change the filter core or clean the filter core, influence the continuous and stable operation of production line.

Disclosure of Invention

The invention aims to overcome the problems in the prior art, and provides a powder extraction system which has high soaking efficiency, can ensure that liquid can permeate powdery materials, can meet the requirement of large-scale industrial production, reduces powder scraps and improves economic benefits.

In order to solve the technical problems, the powder extraction system comprises a powder feeder, a powder leacher and a wet dreg conveyor, wherein the powder leacher comprises a rectangular box body, a plurality of parallel groove body partition boards are connected between front and rear wallboards of the box body, each groove body partition board divides an inner cavity of the box body into a plurality of soaking grooves, overflow ports are respectively arranged on the upper parts of the groove body partition boards, the overflow ports on the adjacent groove body partition boards are staggered in the front-rear direction, the height of each overflow port is gradually reduced from right to left, the discharge end of the right-most soaking groove is connected with a leacher new solution inlet, and the feed end of the left-most soaking groove is connected with a leacher concentrated solution outlet; a leacher solid material inlet is arranged above the feeding end of the leftmost soaking tank; the discharge end of each tank body partition plate is respectively provided with a guide chute for lifting and turning materials to the right, the discharge end of the right wall plate of the tank body is provided with a discharge chute, and the upper end of the discharge chute is provided with a solid material outlet of the leacher; the outlet of the powder feeder is connected with the solid material inlet of the leacher, and the solid material outlet of the leacher is connected with the inlet of the wet meal conveyor; the inlet of the new solvent pump is connected with the fresh solvent pipe, the outlet of the new solvent pump is connected with the new solution inlet of the leacher, the concentrated solution outlet of the leacher is connected with the inlet of the concentrated extract pump, the outlet of the concentrated extract pump is connected with the inlet of the primary hydrocyclone through the mixed solution conveying pipe, the light phase outlet of the primary hydrocyclone is connected with the inlet of the secondary hydrocyclone, the light phase outlet of the secondary hydrocyclone is connected with the inlet of the solution temporary storage tank, and the bottom outlets of the primary hydrocyclone, the secondary hydrocyclone and the solution temporary storage tank are connected with the reflux port of the powder leacher.

Compared with the prior art, the invention has the following beneficial effects: the material enters the solid material inlet of the leacher from the outlet of the powder feeder and falls into the feeding end of the leftmost soaking tank, and the new solvent pump sends new solvent into the new solvent inlet of the leacher and enters the rightmost soaking tank. The soaking and extracting process is completed in the soaking tanks, when the materials are pushed to the discharge ends of the soaking tanks, the materials are fished out upwards along the guide tanks, separated from the liquid level, and then are subjected to short draining and fall into the lower-level soaking tank on the right side. The advancing directions of the materials in the adjacent soaking tanks are opposite, so that the solid materials advance in an S-shaped zigzag manner. When the solid material enters the final-stage soaking tank, the solid material is fully soaked and mixed with the new solution, and then fished out from the discharge end of the right-most soaking tank along the discharge tank, discharged from the solid material outlet of the leacher, and sent out by the wet meal conveyor. The solid material and the solution always keep countercurrent, the material with the highest content contacts with the concentrated solution, and the material with lower content contacts with the dilute solution, so that good osmotic pressure can be always kept, and the mass transfer efficiency is further improved. The solid materials alternately advance along the soaking tank transversely, are fished out to fall into the longitudinal next-stage soaking tank after advancing transversely for one section, are repeatedly stirred, and are in turbulent flow states, so that laminar flow states of the materials and the solution can not occur, and even if the powder with small void ratio can be fully soaked by the solution. Adjacent overflow ports are arranged in a staggered manner in the front-rear direction, the solvent also flows in an S-shaped zigzag manner and is opposite to the advancing direction of the solid material, flows through the whole length of each soaking tank, then overflows into the next soaking tank by utilizing the potential difference and flows back through the whole length of the soaking tank, so that the extraction stroke of the solid material and the solution is greatly prolonged, the full extraction can be realized, and the efficient extraction is realized. The concentrated extract reaching the leftmost soaking tank is discharged from the concentrated extract outlet of the leacher. The liquid level of the soaking liquid is slightly higher than the solid phase, the solid and the liquid are fully mixed, the consumption of the solvent is less, the concentration of the obtained mixed liquid is high, and the evaporation separation energy consumption is less. After the concentrated solution containing a certain amount of powder particles is pumped out by a concentrated extract pump, the concentrated solution is sent to a first-stage hydrocyclone for separation through a mixed solution conveying pipe, the solid particles in the solution are removed for the first time, and then the solid particles in the solution are removed again through a second-stage hydrocyclone, and enter a solution temporary storage tank for storage, wherein the separated solid particle flow can enter a soaking tank of a powder leacher, can enter a second soaking tank from the left, and the particle concentration at the concentrated solution outlet of the leacher is reduced.

As an improvement of the invention, a fresh solvent flowmeter is arranged on an outlet pipeline of the new solvent pump, the outlet of the solution temporary storage tank is connected with the inlet of the concentrated solution delivery pump through an output pipe of the temporary storage tank, the outlet of the concentrated solution delivery pump is connected with the evaporation system through the concentrated solution flowmeter, and the outlet of the concentrated solution delivery pump is also connected with a reflux port of the solution temporary storage tank through a concentrated solution reflux pipe. The concentrated solution after precipitation is discharged from the outlet of the solution temporary storage tank through the output pipe of the temporary storage tank, the concentrated solution delivery pump is used for delivering the concentrated solution to the first-stage evaporator, and the outlet solution of the concentrated solution delivery pump can also return to the solution temporary storage tank through the concentrated solution return pipe in the initial stage of system operation. The fresh solvent flow meter may monitor the flow of fresh solvent and the concentrated solution flow meter may monitor the flow of output concentrated solution.

As a further improvement of the invention, the bottoms of the soaking tanks are arc-shaped and are respectively provided with a soaking tank spiral, and the spiral directions of the adjacent soaking tank spirals are opposite; scraper lifting mechanisms are respectively installed in the guide tanks, and scraper discharging mechanisms are installed in the discharge tanks. The bottom of the soaking tank is arc-shaped and is in spiral fit with the soaking tank, so that dead zones at the bottom of the tank can be avoided; the spiral of the soaking tank is responsible for conveying solid materials in the soaking tank and completing soaking extraction, and the defect of insufficient mass transfer of the materials and the solvent in the simple soaking process is avoided by forced stirring of the spiral blades, so that the materials are reversely advanced in an S shape due to the spiral direction of the spiral of the adjacent soaking tank. The scraper lifting mechanism is used for fishing, draining and lifting the soaked solid materials and is used for solid-liquid separation and solid-phase lifting; the scraper discharging mechanism is used for fishing up, draining and discharging the extracted solid materials. The spiral scraper not only plays a role in conveying solid materials, but also can carry out strong stirring on the solid materials, the height of a material layer in the soaking box can reach 800mm, and compared with the traditional 350mm material layer, the productivity per unit area is improved by 50-80%; the natural permeation of the extract from top to bottom is changed into spiral mechanical stirring, the solid-liquid direct mixing and soaking are performed, the extraction power is high, and the extraction efficiency is high; the solvent quantity of the traditional leaching system participating in circulation is 5 times of that of solid materials, the solid-liquid volume ratio is about 1.2-1.5 times, the initial solvent quantity is only one fourth to one third of that of the original solvent, and a large amount of solvents and occupied funds are greatly saved.

As a further improvement of the invention, at least one baffle plate extending along the left-right direction is respectively arranged in each soaking tank, and the lower end of each baffle plate is respectively clamped above the spiral of the soaking tank through the concave arc on the baffle plate. The baffle plate can prevent the surface layer solution from flowing out in a short circuit without fully contacting with the solid material, the concave arc on the baffle plate is clamped above the spiral of the soaking tank to provide a channel for conveying the material, the solution is forced to pass through the notch of the concave arc on the baffle plate, the solid material is in stirring and mixing contact with the extracting solution, the two phases of turbulence are fully contacted, and the soaking effect of the material and the solution is further improved; the solid and the liquid are contacted in a turbulent flow under the stirring action, the liquid phase is free from chromatography, and the concentration of the same phase is consistent. The multiple baffles make the solvent flow in S shape in the up-down direction in each soaking tank, thereby avoiding the phenomenon of short circuit of the solvent, obviously increasing the extraction power and having high extraction efficiency.

As a further improvement of the invention, the discharge end of the spiral shaft of each soaking tank spiral is respectively provided with a hollow large chain wheel, the lower end of a lifting driving chain of a corresponding scraper lifting mechanism is meshed with the hollow large chain wheel, and a plurality of lifting scrapers are uniformly arranged on the lifting driving chain. Part of materials can enter the discharge end of the soaking tank through the hollowed-out part of the hollowed-out large chain wheel, so that the material receiving area of the lifting scraper is enlarged, and the conveying capacity of the lifting scraper is improved. The spiral of the soaking tank and the scraper lifting mechanism synchronously rotate, the material pushed by the lifting scraper is fished out from the solution and lifted, and falls into the next soaking tank, and the conveying capacity of the lifting scraper is larger than that of the spiral of the soaking tank, so that the material blockage can be avoided.

As a further improvement of the invention, the upper ends of the lifting driving chains are meshed with the lifting small chain wheels, the lifting small chain wheels are respectively arranged on the driving shafts, the driving shafts are also respectively provided with the linkage chain wheels, two adjacent driving shafts are in a group, and the two linkage chain wheels are in transmission connection through the linkage chain; the shaft end of one driving shaft is provided with a large lifting chain wheel, and the large lifting chain wheel is in transmission connection with a main chain of a driving speed reducer through a main chain. The main chain of the drive speed reducer drives the large lifting chain wheel to rotate through the main chain belt, the large lifting chain wheel drives the small lifting chain wheel and the linkage chain wheel to rotate through the driving shaft, the linkage chain drives the other driving shaft and the small lifting chain wheel to synchronously rotate, the two small lifting chain wheels drive the lifting scraping plates to operate and the soaking tank to rotate in a spiral mode through the lifting driving chain, the purpose that one drive speed reducer drives the two soaking tank spirals to push solid materials leftwards and rightwards simultaneously is achieved, and the two scraping plate lifting mechanisms are driven to drag out, drain and lift the solid materials synchronously simultaneously is achieved.

As a further improvement of the invention, the two ends of the spiral shaft of each soaking tank spiral are respectively supported in the spiral bearing seats, each spiral bearing seat is respectively fixed at the center of the round sealing plate, and each round sealing plate is respectively covered and fixed at the outer sides of the spiral mounting holes at the two ends of the soaking tank. The round sealing plate and the spiral bearing seat are removed, the whole spiral of the soaking tank can be pulled out from the spiral mounting hole, the spiral of the soaking tank penetrates through the spiral mounting hole during mounting, then the round sealing plate is covered and fixed through bolts, and then the spiral bearing seat is mounted and fixed.

As a further improvement of the invention, the lower end of the discharging driving chain of the scraper discharging mechanism is meshed with the hollow large chain wheel, and a plurality of discharging scrapers are uniformly arranged on the discharging driving chain. Part of materials can enter the discharging end of the right-most soaking tank through the hollowed-out part of the hollowed-out large chain wheel, so that the material receiving area of the discharging scraper is enlarged, and the conveying capacity of the discharging scraper is improved. The spiral of the soaking tank and the scraper discharging mechanism synchronously rotate, the material pushed by the discharging scraper is fished out from the solution, lifted and discharged out of the leacher, and the conveying capacity of the discharging scraper is larger than that of the spiral of the soaking tank, so that the blockage can be avoided.

As a further improvement of the invention, each soaking tank spiral comprises a spiral shaft and a main spiral sheet wound on the periphery of the spiral shaft, a filter cylinder is arranged at the feed end of the spiral shaft below the solid material inlet of the leacher, a port of the filter cylinder facing one side of the main spiral sheet is closed, the other side of the filter cylinder is open, the concentrated liquid outlet of the leacher is inserted into the inner cavity of the filter cylinder, a plurality of axially extending grid bars are uniformly distributed on the circumference of the filter cylinder, and gaps between adjacent grid bars are narrow outside and wide inside. The powder is trapped on the outer surface of the filter cylinder after being filtered by the filter cylinder before flowing out, so that the content of powdery solid in the concentrated extract is reduced as much as possible, and the guarantee is provided for the subsequent hydrocyclone separation and evaporation; after the concentrated extract in the solid-liquid mixing medium is continuously and stably filtered out, the concentrated extract enters a concentrated extract outlet of a leacher and flows out, and the filtered concentrated extract can be stably and continuously filtered out and conveyed without blocking a liquid outlet pipe valve so as to conveniently enter a hydrocyclone separation system for fine filtration. Once the powder passes through the gap at the outermost side of the filter cylinder, the powder can smoothly fall into the bottom of the filter cylinder and is pushed out by the spiral belt in the filter cylinder to self-clean; avoiding powder particles from being blocked in gaps between adjacent grate bars and affecting the filtering capability.

As a further improvement of the invention, the outer circumference of the filter cylinder is wound with a filter cylinder outer spiral band, and the rotation direction of the filter cylinder outer spiral band is the same as that of the coaxial main spiral piece; the inner wall of the filter cylinder is provided with an inner spiral belt of the filter cylinder, and the rotation direction of the inner spiral belt of the filter cylinder is opposite to that of the coaxial main spiral sheet. The spiral belt outside the filter cylinder can push out the solid materials flowing along with the liquid to the side where the main spiral sheet is positioned, so that excessive materials are prevented from being deposited outside the filter cylinder. A small amount of solid powder enters the filter cartridge along with the extraction liquid, and is settled at the lower part of the inner wall of the filter cartridge, the inner spiral belt of the filter cartridge opposite to the main spiral sheet in rotation direction pushes sediment out of the filter cartridge from the open end, and the sediment is pushed out of the filtering section by the outer spiral belt of the filter cartridge, so that the self-cleaning process of the filter cartridge is completed. Therefore, stable and reliable continuous filtration is realized, the process of the powder extraction system is complete, the difficult problem of separating high-powder-degree materials from liquid is solved, and the powder extraction system has wide adaptability to various oils.

Drawings

The invention will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the invention.

FIG. 1 is a flow chart of a powder extraction system of the present invention.

Fig. 2 is a front view of a first embodiment of a powder leacher in accordance with the present invention.

Fig. 3 is a cross-sectional view taken along A-A in fig. 2.

Fig. 4 is a cross-sectional view taken along B-B in fig. 2.

Fig. 5 is a cross-sectional view taken along line C-C of fig. 2.

Fig. 6 is a schematic view of fig. 2 with the front wall panel removed.

Fig. 7 is a perspective view of fig. 2.

Fig. 8 is a perspective view of the leacher tank of fig. 2 with the top cover removed.

Fig. 9 is a perspective view of two adjacent soaking tanks in fig. 2.

Fig. 10 is a perspective view of the leftmost soaking tank in fig. 2.

Fig. 11 is a perspective view of the filter cartridge of fig. 10.

Fig. 12 is an enlarged view of a portion of a filter cartridge.

FIG. 13 is a schematic view showing an operation of a second embodiment of the powder extractor according to the present invention.

Fig. 14 is a top view of fig. 13.

In the figure: E1. a powder feeder; E2. a powder leacher; E3. a wet meal conveyor; E4. a first-stage hydrocyclone; E5. a secondary hydrocyclone separator; E6. a solution temporary storage tank; E7. a tail gas condenser; E8. an evaporation system; B1. a new solvent pump; B2. a concentrated extract pump; B3. a concentrated solution delivery pump; G1. a fresh solvent tube; G2. a mixed liquid conveying pipe; G3. a temporary storage tank output pipe; G4. a concentrated solution return pipe; G5. a concentrated solution output pipe; q1. fresh solvent flow meter; q2, a concentrated solution flowmeter; 1. a soaking tank; 1a, a solid material inlet of a leacher; 1a1, a feeding honeycomb duct; 1b, a solid material outlet of the leacher; 1c, spiral mounting holes; 1d, a circular sealing plate; 1e, exhaust holes; 2. a tank body partition board; 2a, overflow port; 2b, a guide groove; 2c, a discharge chute; 3. a baffle plate; 3a, concave arcs on the baffle plates; 4. the soaking tank is spiral; 4a, a screw shaft; 4b, a main spiral sheet; 4c, hollowing out a large chain wheel; 4d, a spiral bearing seat; 4e, right pushing the spiral; 4f, pushing the spiral left; 5. a squeegee lifting mechanism; 5a, lifting a driving chain; 5b, lifting the scraping plate; 6. lifting the small chain wheel; 7. a drive shaft; 8. a linked sprocket; 9. a linkage chain; 10. lifting a large chain wheel; 11. a main chain; 12. driving a speed reducer; 12a, a main sprocket; 13. a filter cartridge; 13a, grate bars; 13b, a filter cartridge external screw belt; 13c, a spiral belt in the filter cartridge; 14. a scraper blade discharging mechanism; 14a, a discharging driving chain; 14b, a discharging scraper; 15. a new leaching inlet of the leacher; 16. and a concentrated liquor outlet of the leacher.

Detailed Description

In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

As shown in fig. 1, the powder extraction system of the invention comprises a powder feeder E1, a powder leacher E2 and a wet pulp conveyor E3, wherein the outlet of the powder feeder E1 is connected with the solid material inlet of the leacher, and the solid material outlet of the leacher is connected with the inlet of the wet pulp conveyor E3; the inlet of a new solvent pump B1 is connected with a fresh solvent pipe G1, the outlet of the new solvent pump B1 is connected with a new solution inlet of a leacher, the concentrated solution outlet of the leacher is connected with the inlet of a concentrated extract pump B2, the outlet of the concentrated extract pump B2 is connected with the inlet of a primary hydrocyclone E4 through a mixed solution conveying pipe G2, the light phase outlet of the primary hydrocyclone E4 is connected with the inlet of a secondary hydrocyclone E5, the light phase outlet of the secondary hydrocyclone E5 is connected with the inlet of a solution temporary storage tank E6, and the bottoms of the primary hydrocyclone E4, the secondary hydrocyclone E5 and the solution temporary storage tank E6 are connected with the reflux port of a powder leacher E2.

The materials enter a solid material inlet of a leacher of a powder leacher E2 from an outlet of a powder feeder E1, a new solvent pump B1 sends new solvent into the new solvent inlet of the leacher, the solid materials contact with the solvent in the powder leacher E2 to finish extraction, and the solid materials are discharged from the solid material outlet of the leacher and then sent out by a wet dreg conveyor E3. After the concentrated solution containing a certain amount of powder particles is pumped out by a concentrated extract pump B2, the concentrated solution is sent to a first-stage hydrocyclone E4 for separation through a mixed solution conveying pipe G2, the solid particles in the solution are removed for the first time, then the solid particles in the solution are removed again through a second-stage hydrocyclone E5, the solution enters a solution temporary storage tank E6 for storage, the separated solid particle flow can enter a soaking tank of a powder leacher E2, and can enter a second soaking tank from the left, so that the particle concentration at the concentrated solution outlet of the leacher is reduced.

The outlet pipeline of the new solvent pump B1 is provided with a fresh solvent flowmeter Q1, the outlet of the solution temporary storage tank E6 is connected with the inlet of the concentrated solution delivery pump B3 through the temporary storage tank output pipe G3, the outlet of the concentrated solution delivery pump B3 is connected with the evaporation system E8 through the concentrated solution flowmeter Q2 and the concentrated solution output pipe G5, and the outlet of the concentrated solution delivery pump B3 is also connected with the reflux port of the solution temporary storage tank E6 through the concentrated solution reflux pipe G4. The concentrated solution after precipitation is discharged from the outlet of the solution temporary storage tank E6 through the output pipe G3 of the temporary storage tank, the concentrated solution is sent to the first-stage evaporator by the concentrated solution delivery pump B3, and the outlet solution of the concentrated solution delivery pump B3 can also return to the solution temporary storage tank E6 through the concentrated solution return pipe G4 at the initial stage of system operation. The fresh solvent flow meter Q1 can monitor the flow of fresh solvent and the concentrated solution flow meter Q2 can monitor the flow of output concentrated solution.

As shown in fig. 2 to 14, the powder leacher E2 comprises a rectangular box body, the top of the box body is provided with an exhaust hole 1E and a manhole, and exhaust holes of the exhaust hole 1E and the solution temporary storage tank E6 are connected with the tail gas condenser E7. A plurality of tank body partition boards 2 which are parallel to each other are connected between the front wall board and the rear wall board of the tank body, each tank body partition board 2 divides the inner cavity of the tank body into a plurality of soaking tanks 1, the upper parts of the tank body partition boards 2 are respectively provided with overflow ports 2a, the overflow ports 2a on the adjacent tank body partition boards 2 are arranged in a staggered way in the front-rear direction, the height of each overflow port 2a is gradually reduced from right to left, the discharge end of the right-most soaking tank is connected with a leacher new solution inlet 15, and the feed end of the left-most soaking tank is connected with a leacher concentrated solution outlet 16; the upper part of the feeding end of the leftmost soaking tank is provided with a leacher solid material inlet 1a, the discharging end of each tank body partition plate 2 is respectively provided with a guide chute 2b for lifting and turning materials to the right side, and the discharging end of the right wall plate of the tank body is provided with a discharging chute 2c.

The bottoms of the soaking tanks 1 are arc-shaped, the soaking tank spirals 4 are respectively arranged, the spiral directions of the adjacent soaking tank spirals 4 are opposite, and from the solid material inlet 1a of the solid material leacher, the left pushing spirals 4f are arranged in the odd number of tanks to push the solid material to the front side wall direction of the leacher; the even number of grooves are right pushing screws 4e which push the solid materials to the rear side wall direction of the leacher. The scraper lifting mechanisms 5 are respectively installed in the guide tanks 2b, and the scraper discharging mechanisms 14 are installed in the discharge tanks 2c.

The material enters the feeding end of the leftmost soaking tank from the solid material inlet 1a of the leacher, and the new solvent enters the rightmost soaking tank. The soaking and extracting process is completed in the soaking tank 1, when the materials are pushed to the discharge end of each soaking tank 1 by the soaking tank spiral 4, the materials are fished out upwards by the scraper lifting mechanism 5 along the guide tank 2b, and the materials fall into the lower-level soaking tank on the right side after being separated from the liquid level by short-time draining. The advancing directions of the materials in the adjacent soaking tanks are opposite, so that the solid materials advance in an S-shaped zigzag manner. When the solid material enters the final-stage soaking tank, the solid material is fully soaked and mixed with the new solution, and then is fished out by the scraper discharging mechanism 14 along the discharging tank 2c from the discharging end of the rightmost soaking tank and discharged out of the machine from the solid material outlet 1b of the leacher. The solid material and the solution always keep countercurrent, the material with the highest content contacts with the concentrated solution, and the material with lower content contacts with the dilute solution, so that good osmotic pressure can be always kept, and the mass transfer efficiency is further improved. The solid materials alternately advance along the transverse direction of the soaking tank 1, are fished out to fall into a longitudinal next-stage soaking tank after advancing for a section transversely, are repeatedly stirred, are in turbulent flow states, are not in laminar flow states, and can be fully soaked by the solution even if the powder with small void ratio. The adjacent overflow ports 2a are arranged in a staggered manner in the front-rear direction, the solvent also flows in an S-shaped zigzag manner and is opposite to the advancing direction of the solid material, flows through the whole length of each soaking tank 1, then overflows into the next soaking tank by utilizing the potential difference and flows back through the whole length of the soaking tank, so that the extraction stroke of the solid material and the solution is greatly prolonged, the full extraction can be realized, and the efficient extraction is realized. The concentrate reaching the leftmost soaking tank is discharged from the leacher concentrate outlet 16. The liquid level of the soaking liquid is slightly higher than the solid phase, the solid and the liquid are fully mixed, the consumption of the solvent is less, the concentration of the obtained mixed liquid is high, and the evaporation separation energy consumption is less.

The bottom of the soaking tank 1 is arc-shaped and is matched with the soaking tank spiral 4, so that dead zones at the bottom of the tank can be avoided; the soaking tank spiral 4 is responsible for conveying solid materials in the soaking tank 1 and completing soaking extraction, and the defect of insufficient mass transfer of the materials and the solvent in the simple soaking process is avoided by forced stirring of spiral blades, so that the materials are reversely advanced in an S shape due to the opposite rotation directions of the adjacent soaking tank spiral 4. The scraper lifting mechanism 5 is used for fishing, draining and lifting the soaked solid materials and is used for solid-liquid separation and solid-phase lifting; the scraper discharging mechanism 14 is used for fishing out, draining and discharging the extracted solid materials. The spiral scraper not only plays a role in conveying solid materials, but also can be used for strongly stirring the solid materials.

As shown in fig. 8, at least one baffle plate 3 extending in the left-right direction is respectively arranged in each soaking tank 1, and the lower end of each baffle plate 3 is respectively clamped above the spiral of the soaking tank through a concave arc 3a on the baffle plate. The baffle plate 3 can prevent the surface layer solution from flowing out in a short circuit without fully contacting with the solid material, the concave arc 3a on the baffle plate is clamped above the soaking tank spiral 4 to provide a channel for conveying the material, the solution is forced to pass through the notch of the concave arc 3a on the baffle plate, the solid material is in stirring and mixing contact with the extraction liquid, and the two-phase turbulence state is fully contacted, so that the soaking effect of the material and the solution is further improved; the solid and the liquid are contacted in a turbulent flow under the stirring action, the liquid phase is free from chromatography, and the concentration of the same phase is consistent. The multi-channel baffle plates 3 enable the solvent to flow in an S shape in the up-down direction in each soaking tank 1, thereby avoiding the phenomenon of short circuit of the solvent, obviously increasing the extraction power and having high extraction efficiency.

As shown in fig. 9, the discharge ends of the spiral shafts of the soaking tank spirals 4 are respectively provided with a hollow large sprocket 4c, the lower ends of lifting driving chains 5a of corresponding scraper lifting mechanisms 5 are meshed with the hollow large sprocket 4c, and a plurality of lifting scrapers 5b are uniformly arranged on the lifting driving chains 5a. Part of the materials can enter the discharge end of the soaking tank through the hollowed-out part of the hollowed-out large chain wheel 4c, so that the material receiving area of the lifting scraper 5b is enlarged, and the conveying capacity of the lifting scraper 5b is improved. The soaking tank spiral 4 and the scraper lifting mechanism 5 synchronously rotate, the lifting scraper 5b drags the pushed materials out of the solution, the pushed materials fall into the next soaking tank, the conveying capacity of the lifting scraper 5b is larger than that of the soaking tank spiral 4, and the situation that blocking is caused can be avoided.

The upper end of each lifting driving chain 5a is meshed with a lifting small chain wheel 6, each lifting small chain wheel 6 is respectively arranged on each driving shaft 7, each driving shaft 7 is also respectively provided with a linkage chain wheel 8, two adjacent driving shafts 7 are in a group, and the two linkage chain wheels 8 are in transmission connection through a linkage chain 9; the shaft end of one driving shaft 7 is provided with a large lifting chain wheel 10, and the large lifting chain wheel 10 is in transmission connection with a main chain 12a of a driving speed reducer 12 through a main chain 11. The main chain wheel 12a of the driving speed reducer 12 drives the lifting large chain wheel 10 to rotate through the main chain 11, the lifting large chain wheel 10 drives the lifting small chain wheel 6 and the linkage chain wheel 8 to rotate through the driving shaft 7, the linkage chain 9 drives the other driving shaft 7 and the lifting small chain wheel 6 to synchronously rotate, the two lifting small chain wheels 6 respectively drive the lifting scraping plate 5b to operate and the soaking groove spiral 4 to rotate through the lifting driving chain 5a, the purpose that one driving speed reducer 12 simultaneously drives the two soaking groove spirals 4 to push solid materials leftwards and rightwards is achieved, and the two scraping plate lifting mechanisms 5 are simultaneously driven to synchronously drag out materials, drain and lift the solid materials is achieved.

Both ends of a screw shaft 4a of each soaking tank screw 4 are respectively supported in screw bearing seats 4d, each screw bearing seat 4d is respectively fixed at the center of a circular sealing plate 1d, and each circular sealing plate 1d is respectively covered and fixed at the outer sides of screw mounting holes 1c at both ends of the soaking tank. The whole soaking groove spiral 4 can be pulled out from the spiral mounting hole 1c by removing the circular sealing plate 1d and the spiral bearing seat 4d, the soaking groove spiral 4 penetrates into the spiral mounting hole 1c during mounting, then the circular sealing plate 1d is covered and fixed through bolts, and then the spiral bearing seat 4d is mounted and fixed.

The lower end of a discharging driving chain 14a of the scraper discharging mechanism 14 is meshed with the hollow large chain wheel 4c, and a plurality of discharging scrapers 14b are uniformly arranged on the discharging driving chain 14a. Part of the materials can enter the discharging end of the right-most soaking tank through the hollowed-out part of the hollowed-out large chain wheel 4c, so that the material receiving area of the discharging scraper 14b is enlarged, and the conveying capacity of the discharging scraper 14b is improved. The soaking tank spiral 4 and the scraper discharging mechanism 14 synchronously rotate, the discharging scraper 14b drags the pushed materials out of the solution, the pushed materials are lifted and discharged out of the leacher, and the conveying capacity of the discharging scraper 14b is larger than that of the soaking tank spiral 4, so that the situation that materials are blocked is avoided.

As shown in fig. 10 to 12, each soaking tank screw 4 comprises a screw shaft 4a and a main screw plate 4b wound on the periphery of the screw shaft, a filter cylinder 13 is mounted at the feed end of the leftmost screw shaft below the solid material inlet 1a of the leacher, a port of the filter cylinder 13 facing one side of the main screw plate 4b is closed, the other side is open, a concentrated liquid outlet 16 of the leacher is inserted into an inner cavity of the filter cylinder 13, a plurality of axially extending grate bars 13a are uniformly distributed on the circumference of the filter cylinder 13, and gaps between adjacent grate bars 13a are narrow outside and wide inside. The powder is trapped on the outer surface of the filter cylinder 13 after being filtered by the filter cylinder 13 before flowing out, so that the content of powdery solid in the concentrated extract is reduced as much as possible, and the guarantee is provided for the subsequent hydrocyclone separation and evaporation; after the concentrated extract in the solid-liquid intermixing medium is continuously and stably filtered out, the concentrated extract enters a concentrated extract outlet 16 of the leacher and flows out, and the filtered concentrated extract can be stably and continuously filtered out and conveyed without causing blockage of a liquid outlet pipe valve so as to conveniently enter a hydrocyclone separation system for fine filtration. Once the powder passes through the gap at the outermost side of the filter cylinder 13, the powder can smoothly fall into the bottom of the filter cylinder 13 and is pushed out by the spiral belt 13c in the filter cylinder to self-clean; avoiding powder particles from being blocked in gaps between adjacent grate bars 13a to influence the filtering capability.

The outer circumference of the filter cartridge 13 is wound with a cartridge outer spiral band 13b, and the rotation direction of the cartridge outer spiral band 13b is the same as that of the coaxial main spiral piece 4b. The outer spiral belt 13b of the filter cartridge can push out the solid materials flowing along with the liquid to the side where the main spiral sheet 4b is positioned, so as to avoid excessive materials from accumulating outside the filter cartridge 13.

The inner wall of the filter cartridge 13 is provided with an in-cartridge screw band 13c, and the rotation direction of the in-cartridge screw band 13c is opposite to that of the coaxial main screw piece 4b. A small amount of solid powder enters the filter cylinder 13 along with the extraction liquid, and is settled at the lower part of the inner wall of the filter cylinder 13, and an inner filter cylinder spiral belt 13c which is opposite to the main spiral sheet 4b in rotation direction pushes sediment out of the filter cylinder 13 from the open end, and then is pushed out of the filtering section by an outer filter cylinder spiral belt 13b, so that the self-cleaning process of the filter cylinder 13 is completed. Therefore, stable and reliable continuous filtration is realized, the process of the powder extraction system is complete, the difficult problem of separating high-powder-degree materials from liquid is solved, and the powder extraction system has wide adaptability to various oils.

As shown in fig. 2 and 7, the solid material inlet 1a of the leacher may be disposed at the left part of the top cover of the tank, and the feeding flow guide pipe 1a1 is connected below the solid material inlet 1a of the leacher to guide new solid material to the front side of the filter cartridge 13.

As shown in fig. 13 and 14, the leacher solid inlet 1a may be provided at the upper portion of the left side wall of the tank, and may be located at the front side of the filter cartridge 13 in the front-rear direction. The liquid level of the soaking tank at the rightmost side is highest, and overflows to the left side in sequence. In fig. 14, the large arrow indicates the solid material direction, the small arrow indicates the solution flow direction, and the whole flow is reversed.

The invention adopts one-pot stewing type leaching, is efficient and reliable, and can be used for leaching powdery materials and high-powder-degree materials. Can solve the preparation bottleneck of soybean protein concentrate and cotton seed protein concentrate, and solve the problems of poor material permeability, easy dissolution of protein and sugar to block grid plates, shallow leaching material layer, large equipment investment, low production efficiency, high system failure rate and the like. For powdery offcuts which cannot be treated in the traditional leaching process, such as high-powder soybean flakes and semi-denatured puffed powder, the powder extraction system can be adopted to extract and process the materials with the characteristics into concentrated protein, so that the economic value of the materials can be greatly improved, and the economic benefit and market competitiveness of enterprises can be improved.

The method is used for oil-containing materials such as fish meal, rice bran, rapeseed cake, tea seed cake and the like, and can improve the utilization rate and economic value of the oil-containing materials; the method can be used for leaching the pressed palm kernel cake, and can be used for directly leaching the palm kernel under the condition of proper thickness of the rolled blank, so that the equipment investment is saved, and the use is simple and convenient; can be widely applied to processing most oil or oil-containing materials, and realizes 'universal' extraction.

The foregoing description is only of a preferred embodiment of the invention and is not intended to limit the scope of the invention. In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention. The technical features of the present invention that are not described may be implemented by or using the prior art, and are not described herein.

Claims

1. The utility model provides a powder extraction system, includes powder feeder, powder leaches ware and wet meal conveyer, its characterized in that: the powder leacher comprises a rectangular box body, a plurality of parallel groove body partition boards are connected between front and rear wall boards of the box body, the inner cavity of the box body is divided into a plurality of soaking grooves by each groove body partition board, overflow ports are respectively arranged on the upper parts of the groove body partition boards, the overflow ports on the adjacent groove body partition boards are arranged in a staggered manner in the front-rear direction, the height of each overflow port is gradually reduced from right to left, the discharge end of the right-most soaking groove is connected with a leacher new solution inlet, and the feed end of the left-most soaking groove is connected with a leacher concentrated solution outlet; a leacher solid material inlet is arranged above the feeding end of the leftmost soaking tank; the discharge end of each tank body partition plate is respectively provided with a guide chute for lifting and turning materials to the right, the discharge end of the right wall plate of the tank body is provided with a discharge chute, and the upper end of the discharge chute is provided with a solid material outlet of the leacher; the outlet of the powder feeder is connected with the solid material inlet of the leacher, and the solid material outlet of the leacher is connected with the inlet of the wet meal conveyor; the inlet of the new solvent pump is connected with a fresh solvent pipe, the outlet of the new solvent pump is connected with a new solution inlet of the leacher, the concentrated solution outlet of the leacher is connected with an inlet of a concentrated extract pump, an outlet of the concentrated extract pump is connected with an inlet of a primary hydrocyclone through a mixed solution conveying pipe, a light phase outlet of the primary hydrocyclone is connected with an inlet of a secondary hydrocyclone, a light phase outlet of the secondary hydrocyclone is connected with an inlet of a solution temporary storage tank, and bottom outlets of the primary hydrocyclone, the secondary hydrocyclone and the solution temporary storage tank are connected with a reflux port of the powder leacher;

the bottoms of the soaking tanks are arc-shaped, the soaking tank spirals are respectively arranged, and the spiral directions of the adjacent soaking tank spirals are opposite; the scraper lifting mechanisms are respectively arranged in the guide tanks, and the scraper discharging mechanisms are arranged in the discharge tanks;

at least one baffle plate extending along the left-right direction is arranged in each soaking tank, and the lower end of each baffle plate is clamped above the spiral of the soaking tank through the concave arc on the baffle plate.

2. The powder extraction system of claim 1, wherein: the outlet pipeline of the new solvent pump is provided with a fresh solvent flowmeter, the outlet of the solution temporary storage tank is connected with the inlet of the concentrated solution delivery pump through the output pipe of the temporary storage tank, the outlet of the concentrated solution delivery pump is connected with the evaporation system through the concentrated solution flowmeter, and the outlet of the concentrated solution delivery pump is also connected with the reflux port of the solution temporary storage tank through the concentrated solution reflux pipe.

3. The powder extraction system of claim 1, wherein: the spiral shaft discharge end of each soaking tank spiral is respectively provided with a hollow large chain wheel, the lower ends of lifting driving chains of corresponding scraper lifting mechanisms are meshed with the hollow large chain wheels, and a plurality of lifting scrapers are uniformly arranged on the lifting driving chains.

4. A powder extraction system as claimed in claim 3 wherein: the upper ends of the lifting driving chains are meshed with the lifting small chain wheels, the lifting small chain wheels are respectively arranged on the driving shafts, the driving shafts are also respectively provided with the linkage chain wheels, two adjacent driving shafts are in a group, and the two linkage chain wheels are in transmission connection through the linkage chain; the shaft end of one driving shaft is provided with a large lifting chain wheel, and the large lifting chain wheel is in transmission connection with a main chain of a driving speed reducer through a main chain.

5. The powder extraction system of claim 1, wherein: the two ends of the spiral shaft of each soaking tank spiral are respectively supported in the spiral bearing seats, each spiral bearing seat is respectively fixed at the center of the round sealing plate, and each round sealing plate is respectively covered and fixed at the outer sides of spiral mounting holes at the two ends of the soaking tank.

6. A powder extraction system as claimed in claim 3 wherein: the lower end of a discharging driving chain of the scraper discharging mechanism is meshed with the hollow large chain wheel, and a plurality of discharging scrapers are uniformly arranged on the discharging driving chain.

7. The powder extraction system of any one of claims 1 to 6, wherein: each soaking tank spiral comprises a spiral shaft and a main spiral sheet wound on the periphery of the spiral shaft, a filter cylinder is arranged at the feed end of the spiral shaft below a solid material inlet of the leacher, the port of the filter cylinder facing one side of the main spiral sheet is closed, the other side of the filter cylinder is open, a concentrated liquid outlet of the leacher is inserted into an inner cavity of the filter cylinder, a plurality of axially extending grate bars are uniformly distributed on the circumference of the filter cylinder, and gaps between adjacent grate bars are narrow outside and wide inside.

8. The powder extraction system of claim 7, wherein: the outer periphery of the filter cylinder is wound with a filter cylinder outer spiral strip, the rotation direction of the filter cylinder outer spiral strip is the same as that of the coaxial main spiral sheet, the inner wall of the filter cylinder is provided with a filter cylinder inner spiral strip, and the rotation direction of the filter cylinder inner spiral strip is opposite to that of the coaxial main spiral sheet.