CN115463597B - Starch size mixing system and size mixing method - Google Patents

Starch size mixing system and size mixing method Download PDF

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Publication number
CN115463597B
CN115463597B CN202211053624.0A CN202211053624A CN115463597B CN 115463597 B CN115463597 B CN 115463597B CN 202211053624 A CN202211053624 A CN 202211053624A CN 115463597 B CN115463597 B CN 115463597B
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China
Prior art keywords
size mixing
starch
water
rod
area
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Chinese (zh)
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CN115463597A (en
Inventor
陈瑞锋
许克强
邓远德
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Ma'anshan Tongjieliang Polylactic Acid Materials Co ltd
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Maanshan Tongjieliang Biological Material Co ltd
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Priority to CN202211053624.0A priority Critical patent/CN115463597B/en
Publication of CN115463597A publication Critical patent/CN115463597A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7179—Feed mechanisms characterised by the means for feeding the components to the mixer using sprayers, nozzles or jets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)

Abstract

The invention provides a starch size mixing system used in the preparation of lactic acid by biological fermentation, which comprises a metering tank, a conveying unit and a size mixing tank; the metering tank is provided with a feeding port for feeding starch raw materials, the discharging port of the metering tank is connected with the feeding port of the conveying unit, the discharging port of the conveying unit is connected with the feeding port of the pulp mixing tank, and the pulp mixing tank is provided with a water inlet, a pressure discharging port and a pulp discharging port for discharging starch pulp; the pipeline of the conveying unit is internally provided with a spiral conveying area and a pre-slurry-adjusting area along the conveying direction of materials, the spiral conveying area is internally provided with a spiral conveying mechanism, and the pre-slurry-adjusting area is internally provided with a first stirring mechanism and a water spraying mechanism. The slurry mixing system pre-utilizes the transmission unit to pre-mix the starch in the process of conveying the starch to the slurry mixing tank before the starch enters the slurry mixing tank to perform formal slurry mixing, and compared with the traditional slurry mixing method, the slurry mixing system has higher slurry mixing efficiency.

Description

Starch size mixing system and size mixing method
Technical Field
The invention relates to the technical field of biological fermentation, in particular to a starch pulp mixing system and a pulp mixing method in the process of preparing lactic acid by fermentation.
Background
In the existing production process for preparing glucose by liquefying and hydrolyzing starch by a double enzyme method, the first step is to mix commercial starch with water to prepare starch slurry which is suitable for spray heating and meets the concentration required by starch hydrolysis. In the usual process of size mixing, commercial starch is fed into a size mixing tank with a stirring device, which is pre-stored with a certain amount of size mixing water, starch and water are mixed to prepare starch size with a certain concentration, then hydrochloric acid or caustic soda is added into the starch size to adjust the pH value of the starch size, and then a certain amount of alpha-amylase is added to be uniformly mixed, and the mixture is pumped to a primary steam jet heater. The stirring time in the size mixing process is long, the efficiency is low, more starch clusters exist in the stirred starch size, the starch and the water are not fully mixed, the starch size is uneven, the concentration of the starch size is low, the production quality is poor, and the yield of starch sugar and the quality of starch sugar are influenced. In addition, because the size mixing time is long, the production efficiency is low, more size mixing equipment is needed to meet the size mixing requirement of the downstream working section during mass production, and the production cost is high.
Aiming at the problems of the existing starch size mixing method, the disclosed patent makes various improvements.
Patent CN208944013U discloses a starch sugar production is with size mixing device, including first size mixing tank and support column, fixed mounting has a plurality of support columns all around the bottom of first size mixing tank, the inside bottom fixed mounting of first size mixing tank has first agitating unit, the top fixed mounting of first size mixing tank has filter pipeline, the top fixed mounting of filter pipeline has the second size mixing tank, the inside bottom fixed mounting of second size mixing tank has a plurality of second agitating unit, and the device simple structure, the step-by-step stirring can be so that impurity in the production process is showing and is reducing, has improved the utilization ratio of raw and other materials. The scheme is only improved in the aspect of stirring, stirring is performed step by step for multiple times, but starch and size mixing water are still directly added into a size mixing tank for mixing and then are stirred, and the mixing mode still has the problem that starch clusters are easy to form and the size mixing effect is influenced.
Patent CN102836655a discloses a method for pulping by using a pulping device, the pulping device includes a stirring tank with a feeding port, the pulping device further includes a feeding support structure for supporting the material to be pulped sealed in the packaging bag, the feeding support structure has a feeding port, a discharging port and an operation hole on the upper part, the lower part and the side part, and the feeding port of the feeding support structure is located above the feeding port of the stirring tank and is matched with the feeding port, the method includes injecting a solvent for pulping into the stirring tank and transporting the material to be pulped sealed in the packaging bag onto the feeding support structure, then operating Kong Tuiji the material to be pulped at the sealing edge of the packaging bag to make the amount of the material to be pulped at the sealing edge of the packaging bag smaller than the amount of the material to be pulped at other positions in the packaging bag, then opening the sealing of the packaging bag, and making the material to be pulped enter the stirring tank and stir. The patent focuses on improving the feeding mode, reduces the labor intensity of operators and improves the pulp mixing efficiency, but the mixing mode of starch and pulp mixing water is not fundamentally changed, and the pulp mixing water and starch are added into the same stirring tank together for stirring and mixing, so that starch clusters cannot be avoided in the starch mixing process.
The problem in the prior art is mainly that starch clusters are easily formed and the size mixing effect is affected if the starch and the size mixing water are not uniformly and thoroughly mixed in the mixing process. Therefore, in order to actually avoid the formation of starch clusters when starch and size mixing water are mixed, there is a need for improvement in the manner of mixing starch and size mixing water in addition to the increased number of stirring steps and times as employed in the published patent CN 208944013U.
Disclosure of Invention
In order to solve the problems of low starch size mixing efficiency, uneven mixing of starch and water and easy occurrence of starch clusters in the existing method, the invention provides a high-efficiency starch size mixing system, and the sizing agent obtained by the system is very uniform.
The basic conception of the technical scheme of the invention is as follows:
a starch size mixing system comprises a metering tank, a conveying unit and a size mixing tank; the metering tank is provided with a feeding port for feeding starch raw materials, a discharging port of the metering tank is connected with a feeding port of the conveying unit, a discharging port of the conveying unit is connected with a feeding port of the pulp mixing tank, and the pulp mixing tank is provided with a water inlet, a pressure discharging port and a pulp discharging port for discharging starch pulp;
the pipeline of the conveying unit is internally provided with a spiral conveying area and a pre-pulp-adjusting area along the conveying direction of materials, the spiral conveying area is internally provided with a spiral conveying mechanism, and the pre-pulp-adjusting area is internally provided with a first stirring mechanism and a water spraying mechanism.
As an example, a central transmission rod penetrating through the central parts of the spiral transmission area and the pre-pulp mixing area and driven to rotate by a first driving mechanism is arranged in the pipeline of the conveying unit, the spiral conveying mechanism is circumferentially arranged on the central transmission rod, and one end of the first stirring mechanism is arranged on the central transmission rod.
Optionally, the ratio of the length of the central transmission rod in the spiral transmission area to the length of the central transmission rod in the pre-pulp-mixing area is 1:1-1:3, and preferably 1:2.
As an example, a partition plate is arranged between the spiral transmission area and the pre-slurry pre-mixing area, the upper end of the partition plate is arranged on the top wall of the pipeline of the conveying unit, and the central transmission rod vertically penetrates through the partition plate, and the lower edge of the partition plate is suspended below the central transmission rod.
Optionally, the area of the separator is 2/3 of the interface between the screw conveyor zone and the pre-slurry zone.
As an example, the first stirring mechanism includes a first stirring rod and a first stirring blade, one end of the first stirring rod is fixed on the central transmission rod, and the other end of the first stirring rod is connected with the first stirring blade.
Optionally, the first stirring blade is arc-shaped, and the radian of the arc is matched with the radian of the inner wall of the pipeline of the pre-pulping area so that the outer surface of the first stirring blade is in seamless contact with the inner wall of the pipeline;
optionally, the pre-slurry-mixing area is provided with a plurality of first stirring mechanisms, and one end of the first stirring rod is symmetrically or alternately arranged on the central transmission rod at intervals.
As an example, the water spraying mechanism comprises a plurality of nozzles arranged on the inner wall of the pipeline in the pre-pulp mixing area, the nozzles are connected with a water delivery tank arranged in the conveying unit, and the water delivery tank is connected with a water storage tank arranged above the conveying unit through a pressure pump and a first water delivery pipe.
Optionally, the nozzle is elliptical and the major axis of the ellipse is parallel to the central drive rod.
Optionally, the water storage tank is placed on a support platform fixed on the top of the outside of the delivery unit.
As an example, the part of the central transmission rod in the spiral transmission area is a solid rod, the part of the central transmission rod in the pre-pulp-adjusting area is a hollow rod, a joint of the hollow rod and the solid rod extends towards one side of the hollow rod to form a water injection unit, a water injection port of the water injection unit is connected with a water storage tank arranged above the conveying unit through a pressure pump and a second water conveying pipe, a water outlet of the water injection unit is connected with the hollow rod, and the water spraying mechanism further comprises water spraying holes which are formed in the peripheral wall of the hollow rod.
Optionally, the water spraying holes are staggered with the nozzles.
Optionally, the water spraying hole is an elliptical hole, and the long axis of the elliptical hole is parallel to the central transmission rod.
Optionally, the water spray holes are distributed along the hollow rod in a single row or multiple parallel rows.
Optionally, water delivery control valves for adjusting the flow rate are arranged on the first water delivery pipe and the second water delivery pipe.
As an example, the water injection unit includes a sealed space, a water storage space provided at an inner periphery of the sealed space, and a baffle plate, the water storage space being communicated with the water injection port;
the hollow rod is characterized in that a plurality of staggered hollow holes are formed in the peripheral wall of the hollow rod in the water storage space, one end of the baffle plate is fixed on the hollow rod at the front end and the rear end of the hollow hole, the other end of the baffle plate extends to the sealing space, and the sealing space is filled with a sealing material with low friction coefficient and water resistance.
Optionally, the sealing material is made of nitrile rubber, neoprene or polytetrafluoroethylene, and more preferably polytetrafluoroethylene.
Optionally, the conveying unit is inclined downwards by 5-10 degrees from the feeding hole to the discharging hole.
Optionally, the mounting height of the metering tank is higher than the mounting height of the conveying unit.
As an example, a plurality of air blowing holes are provided on the pipe wall of the conveying unit below the partition plate, and the air blowing holes are connected with the air blowing unit through an air supply hose.
Optionally, an included angle between the central line of the air blowing hole and the central line of the central transmission rod is 20-45 degrees, and preferably 30 degrees.
As an example, a second stirring mechanism driven by a second driving mechanism is arranged in the size mixing tank, the second stirring mechanism comprises a second stirring rod and a second stirring blade, one end of the second stirring rod is connected with the spiral groove of the central transmission rod through a driving gear to form a driving conversion unit, and the other end of the second stirring rod is connected with the second stirring blade.
As an example, the starch size mixing system is provided with a plurality of size mixing tanks, and the discharge port of the conveying unit is connected with the feed inlet of each size mixing tank through a material distributing valve.
Optionally, the starch size mixing system is provided with a master control unit for regulating and controlling controllable opening and closing or action elements arranged on the metering tank, the conveying unit, the size mixing tank and a pipeline between the metering tank and the size mixing tank.
Optionally, the master control unit comprises a feeding control module, a conveying unit control module, a water spraying control module, a blowing control module, a stirring control module and a slurry mixing control module.
The invention also provides a starch size mixing method, which is based on the starch size mixing system, wherein the starch size mixing method performs pre-size mixing in a pre-size mixing area of a conveying unit for conveying raw starch from a metering tank to a size mixing tank, and then enters the size mixing tank to perform formal size mixing to obtain uniform and non-caking starch size.
Compared with the prior art, the invention has the following advantages:
1. the slurry mixing system of the invention pre-mixes the starch in the process of conveying the starch to the slurry mixing tank by utilizing the transmission unit before the starch enters the slurry mixing tank for formal slurry mixing, and compared with the traditional slurry mixing method, the slurry mixing system has high slurry mixing efficiency and can shorten the slurry mixing time by 40 percent.
2. The starch slurry obtained by the slurry mixing method is uniform and free from agglomerations, so that the quality of sugar liquid in a later working section is ensured to be fully ensured, and the yield of starch sugar is improved. The comprehensive production cost in the pulp mixing process is reduced.
3. According to the invention, the slurry mixing water is sprayed to the pre-slurry mixing section through the spray nozzle and the spray hole, starch is uniformly mixed with the slurry mixing water under the action of the stirring unit, and the formed starch slurry is transferred into the slurry mixing tank through the discharge hole to be further stirred, so that the slurry mixing liquid is prepared.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a schematic view showing a part of the structure of a starch size mixing system according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a stirring rod in the size mixing tank shown in fig. 1 connected with a central transmission rod of a transmission unit.
Fig. 3 is a schematic view of the structure of the conveying unit shown in fig. 1.
Fig. 4 is a left side view of a cross section at the bulkhead of fig. 3.
Fig. 5 is a schematic structural view of the water injection unit.
Fig. 6 is a schematic structural view of the blowhole.
Fig. 7 is a plan view of the blow hole distribution pattern.
Fig. 8 is a schematic diagram showing the composition of the master control unit of embodiment 1 of the present invention.
Fig. 9 is a schematic structural view of a starch size mixing system according to embodiment 2 of the present invention.
Labeling and describing:
11. a metering tank; 12. a conveying unit; 13. a size mixing tank; 111. a feed port; 112. a discharge port; 121. a first driving mechanism; 122. a drive conversion unit; 123. a feed inlet; 124. a discharge port; 125. a water storage tank; 131. a second stirring rod; 132. a second stirring blade; 133. a feed inlet; 134. a slurry discharge port; 135. a pulp discharge valve; 136. a pressure discharge port; 21. a central transmission rod; 211. a spiral groove; 22. a drive gear; 31. a material distributing valve; 32. a second driving mechanism; 33. a water inlet; 41. a partition plate; 42. a water injection unit 42; 43. a first stirring rod 43;431 a first stirring vane; 44. a water spraying hole; 45. a nozzle; 51. the lower edge of the baffle; 52. a support platform; 53. a pressure pump; 54. a first water pipe; 55. a second water pipe; 56. a water delivery tank; 551. a water delivery control valve; 61. a hollow rod; 62. a solid rod; 63. a water filling port; 64. a sealing unit; 65 water storage space; 66, hollowed holes; 641. a baffle; 642. sealing the space; 71. a blow hole; 72. a gas supply hose; 73. the center line of the air blowing hole; 74. the center line of the center transmission rod; 75. and an included angle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Example 1
A starch size mixing system, as shown in fig. 1-7, comprises a metering tank 11, a conveying unit 12 and a size mixing tank 13; the metering tank 11 is provided with a feeding port 111 for feeding starch raw materials, a discharging port 112 of the metering tank 11 is connected with a feeding port 123 of the conveying unit 12, a discharging port 124 of the conveying unit 12 is connected with a feeding port 133 of the size mixing tank 13, and the size mixing tank 13 is provided with a water inlet 33, a pressure discharging port 136 and a size discharging port 134 for discharging starch size;
the pipeline of the conveying unit 12 is internally provided with a spiral conveying area and a pre-pulp-adjusting area in sequence along the conveying direction of materials, the spiral conveying area is internally provided with a spiral conveying mechanism, and the pre-pulp-adjusting area is internally provided with a first stirring mechanism and a water spraying mechanism.
As one way, the pipe of the conveying unit 12 has a central transmission rod 21 penetrating through the central parts of the spiral conveying area and the pre-slurry-mixing area and driven to rotate by a first driving mechanism 121, the spiral conveying mechanism is circumferentially arranged on the central transmission rod 21, and one end of the first stirring mechanism is arranged on the central transmission rod 21.
Optionally, the ratio of the length of the central transmission rod 21 in the spiral transmission area to the length of the pre-pulp mixing area is 1:1-1:3, preferably 1:2.
As a way, a partition 41 is disposed between the spiral conveying area and the pre-slurry pre-mixing area, the upper end of the partition 41 is disposed on the top wall of the pipeline of the conveying unit 12, the central transmission rod 21 vertically passes through the partition 41, and the lower edge 51 of the partition is suspended below the central transmission rod 21.
The partition 41 is arranged above the central transmission rod 21 to form a partition, and is in an open communication state below the partition, so that starch in the pre-pulping area and water for pulping are conveniently blocked from being mixed into a screw transmission area at the front end, and starch conveyed from the screw transmission area at the front end is conveniently transferred to the pre-pulping area at the rear end, and the influence on the conveying of starch raw materials is avoided. Alternatively, the area of the partition 41 is 2/3 of the interface between the screw conveyor zone and the pre-slurry zone.
As one way, the first stirring mechanism includes a first stirring rod 43 and a first stirring blade 431, where one end of the first stirring rod 43 is fixed on the central transmission rod 21, and the other end is connected to the first stirring blade 431.
Optionally, the first stirring vane 431 has an arc shape, and the arc shape is matched with the arc shape of the inner wall of the pipeline in the pre-slurry mixing area. This arrangement facilitates the first stirring blade 431 to stir and mix the starch that remains below the pre-size mixing zone.
The radian of the first stirring vane 431 is the same as the circle center of the circumference of the inner wall of the pipeline in the pre-slurry-mixing area, and the outermost surface of the first stirring vane 431 is in seamless contact with the surface of the inner wall of the pipeline, so that the first stirring vane 431 is beneficial to scraping the material on the inner wall of the pipeline, and further the stirring uniformity is beneficial.
Optionally, the pre-slurry mixing area is provided with a plurality of first stirring mechanisms, and one end of the first stirring rod 43 is symmetrically or alternately arranged on the central transmission rod 21 at intervals.
Two or more first stirring mechanisms, for example, 2, 3 or 4 first stirring mechanisms can be arranged on the same circumferential direction, so that any position of the inner wall of the pipeline in the pre-slurry-mixing area can be stirred without dead angles.
As one mode, the water spraying mechanism comprises a plurality of nozzles 45 arranged on the inner wall of the pipeline in the pre-pulp mixing area, the nozzles 45 are connected with a water conveying groove 56 arranged in the conveying unit 12, and the water conveying groove 56 is connected with a water storage tank 125 arranged above the conveying unit 12 through a pressure pump 53 and a first water conveying pipe 54.
The water storage tank 125 increases the size mixing water to a certain pressure by the pressure pump 53 installed on the first water pipe 54, and then the size mixing water with a certain pressure is delivered to the water delivery tank 56 through the first water pipe 54, and is sprayed to the pre-mixing area through the nozzle 45 to be mixed with starch.
The nozzles 45 may be arranged in a specific manner, for example, 4 to 8, for example, 6, nozzles are equally spaced on the same circumference.
Optionally, the nozzle 45 is elliptical and the major axis of the ellipse is parallel to the central drive rod 21. The arrangement is convenient for the process of pre-mixing slurry in the rotation of the central transmission rod 21, and the slurry mixing water sprayed to the pre-mixing section by the nozzle 45 is approximately in a strip shape so as to increase the contact surface of the slurry mixing water and starch, thereby being beneficial to the mixing uniformity of the slurry mixing water and the starch.
Optionally, the water storage tank 125 is placed on a support platform 52 fixed to the outside top of the delivery unit 12.
As one way, the part of the central transmission rod 21 in the spiral transmission area is a solid rod 62, the part of the central transmission rod in the pre-pulp-mixing area is a hollow rod 61, a water injection unit 42 is arranged at the joint of the hollow rod 61 and the solid rod 62 towards one side of the hollow rod 61 in an extending way, a water injection port 63 of the water injection unit 42 is connected with a water storage tank 125 arranged above the conveying unit 12 through a pressure pump 53 and a second water conveying pipe 55, a water outlet is connected with the hollow rod 61, the water spraying mechanism further comprises a water spraying hole 44, and the water spraying hole 44 is arranged on the peripheral wall of the hollow rod 61.
The arrangement of the water spraying holes 44 further improves the mixing uniformity of the starch and the size mixing water, and improves the efficiency and quality of the starch pre-size mixing.
Optionally, the water spray holes 44 are staggered with respect to the nozzles 45.
Alternatively, the water spray hole 44 is an elliptical hole, and the long axis of the elliptical hole is parallel to the center drive rod 21.
Alternatively, the water spray holes 44 may be distributed along the hollow shaft 61 in a single row or in parallel rows.
It should be understood that the position of the opening of the water spraying hole 44 is avoided from the position where the first stirring rod 43 is installed.
Optionally, the first water pipe 54 and the second water pipe 55 are provided with a water delivery control valve 551 for adjusting the flow.
As one embodiment, the water injection unit 42 includes a sealed space 642, a water storage space 65 provided at an inner periphery of the sealed space 642, and a blocking piece 641, and the water storage space 65 communicates with the water injection port 63;
the hollow rod 61 in the water storage space 65 is provided with a plurality of staggered hollow holes 66 on the peripheral wall, one end of the blocking piece 641 is fixed on the hollow rod 61 at the front and rear ends of the hollow holes 66, the other end extends to the sealing space 642, and the sealing space 642 is filled with a sealing material with low friction coefficient and water resistance.
The sealing material mainly seals the contact position of the sealing unit 64 and the hollow rod 61, and prevents the liquid in the water storage space 65 from penetrating into the sealing space 642.
The specific arrangement mode of the hollow holes 66 may be that 6 to 10 hollow holes 66, for example 8, are uniformly distributed on the hollow rod 61 located in the water storage space 65 at intervals.
The hollowed-out hole 66 may be circular in shape.
When the water storage space 65 is full of the slurry mixing water, the hollow rod 61 rotates, the slurry mixing water enters the hollow rod 61 from the hollow hole 66, and when the slurry mixing water has a certain pressure, the slurry mixing water entering the hollow rod 61 is sprayed out from the water spraying hole 44 arranged on the hollow rod 61.
During rotation of the hollow rod 61, the shutter 641 rotates synchronously within the sealed space 642.
Referring to fig. 5, the barrier 641 may further prevent liquid from leaking out of the water containing space 65.
The blocking piece 641 and the hollow rod 61 are integrally formed, so that liquid in the water storage space 65 cannot leak from the joint of the blocking piece 641 and the hollow rod 61. When the sealing material is not filled, the liquid in the water storage space 65 needs to bypass the barrier 641 to be leaked, and when the sealing material is further filled in the sealing space 642, the liquid in the water storage space 65 may leak only after passing through the sealing material and bypassing the barrier 641. Without the flap 641, the liquid in the water holding space 65 may leak directly from the connection between the sealing unit 64 and the hollow rod 61.
The sealing material wraps the blocking piece 641, but a small amount of gap is left at the position where the sealing material contacts the blocking piece 641, so that the blocking piece 641 can rotate conveniently without interference with the sealing material.
Optionally, the sealing material is made of nitrile rubber, neoprene or polytetrafluoroethylene, and more preferably polytetrafluoroethylene.
Optionally, in order to save the conveying power and simultaneously better convey the starch and the starch slurry after the pre-pulping, the conveying unit 12 is inclined by 5 ° to 10 ° downwards from the feeding hole 123 to the discharging hole 124. Alternatively, the installation height of the metering tank 11 is higher than the installation height of the conveying unit 12. This facilitates the transfer of starch from the metering tank 11 into the delivery unit 12 by means of the height difference, saving power.
As a way, in order to ensure a smooth starch entry into the pre-pulping zone at the rear end, a number of blow holes 71 are provided in the pipe wall of the conveying unit 12 below the partition 41, said blow holes 71 being connected to the blower unit by means of a supply hose 72.
Specifically, three sets of the air blowing holes 71 are arranged in parallel in a direction parallel to the central axis of the central transmission rod 21 or in a direction perpendicular to the central transmission rod 21, for example, 6 to 10, for example, 8, air blowing holes 71 are arranged in each set in a direction perpendicular to the central transmission rod 21, and each set of the air blowing holes 71 is uniformly distributed on the pipe arc surface of the partition lower edge 51 of the partition 41.
Optionally, the included angle 75 between the center line 74 of the air blowing hole and the center line 74 of the center driving rod is 20 ° to 45 °, for example 30 °.
The above arrangement further ensures that the air blown out from the air blowing holes 71 is blown toward the back end pre-pulp area, so that the starch transferred thereto smoothly enters the back end pre-pulp area, and when the starch enters the pre-pulp area, mixing with the pulp-mixing water ejected from the water spraying holes 44 and the nozzles 45 is started.
Because the nozzle 45 and/or the water jet hole 44 continuously jet the pulp mixing water with a certain pressure, the pressure is higher than that of the pre-pulp mixing area, and therefore the materials in the pre-pulp mixing area cannot reversely enter the water jet hole 44 and the nozzle 45.
Also, since the gas blowing holes 71 continue to blow out the gas, the starch in the pipe of the conveying unit 12 does not enter the gas blowing holes 71.
The starch slurry after preliminary slurry mixing through the pre-mixing structure at the rear end of the conveying unit is discharged from the discharge port 124 of the conveying unit 12 to the slurry mixing tank 13 for formal slurry mixing treatment.
The second stirring mechanism driven by the second driving mechanism 32 is arranged in the size mixing tank 13, the second stirring mechanism comprises a second stirring rod 131 and a second stirring blade 132, one end of the second stirring rod 131 is connected with the spiral groove 211 of the central transmission rod 21 through the driving gear 22 to form a driving conversion unit 122, and the other end of the second stirring rod 131 is connected with the second stirring blade 132. The rotation speed of the second stirring rod 131 in the size mixing tank 13 is consistent with the rotation speed of the central transmission rod 21 of the conveying unit 12.
In the size mixing tank 13, the amount of the size mixing water fed from the water inlet 33 and the stirring time of the second stirring mechanism are controlled, and the starch size pre-adjusted by the conveying unit 12 is further mixed into the starch size mixing liquid required for the subsequent process. The prepared slurry is discharged from the slurry discharge port 134 below the slurry tank 13 to a downstream storage tank for use, wherein the discharge amount and discharge speed of the slurry are controlled by a slurry discharge valve 135 provided below the slurry discharge port 134.
The discharge port 136 provided at the upper portion of the surge tank 13 is used to regulate the pressure in the surge tank 13, maintaining the pressure constant.
The starch size mixing system is a full-automatic system, and is provided with a total control unit for regulating and controlling controllable opening and closing or action elements arranged on a metering tank 11, a conveying unit 12, a size mixing tank 13 and pipelines between the metering tank and the size mixing tank;
the general control unit comprises a feeding control module, a conveying unit control module, a water spraying control module, a blowing control module, a stirring control module and a slurry mixing control module.
The above-mentioned controllable opening and closing or actuating elements include a metering tank 11, a conveying unit 12, a stirring mechanism in the slurry mixing tank 13, a water spraying mechanism, a central transmission rod 21 and the like, a water delivery control valve 551, a pump or a metering element and the like arranged on a pipeline.
The specific connection control scheme of the above modules and the controllable opening and closing or action elements can be adopted by conventional means in the prior art, and can be flexibly adopted by those skilled in the art, and the details are omitted again.
The starch size mixing method is based on the starch size mixing system, and performs pre-size mixing in a pre-size mixing area of a conveying unit 12 for conveying raw starch from a metering tank 11 to a size mixing tank 13, and then enters the size mixing tank 13 for size mixing, so that uniform and non-agglomerated starch size is obtained.
Example 2
The difference from the embodiment 1 is that the starch size mixing system is provided with a plurality of size mixing tanks 13 as shown in fig. 9, and the discharge port 124 of the conveying unit 12 is connected with the feed port 133 of each size mixing tank 13 through a material dividing valve 31.
The second stirring mechanism of each size mixing tank 13 is controlled by a second drive mechanism 32 provided separately. The water inlet 33 and the pressure discharge port 136 of each size mixing tank 13 are respectively and independently arranged.
Referring to fig. 9, the starch slurry pre-slurried by the conveying unit 12 is first transferred to the left-hand slurry mixing tank 13 for slurry mixing. When the left side mixing tank 13 does not complete the mixing, but the starch slurry of which the pre-mixing is completed in the conveying unit 12 needs to be transferred, the starch slurry can be transferred into the right side mixing tank for mixing through the distributing valve 31.
This embodiment can fully utilize the transfer unit 12 for pre-conditioning, improving overall efficiency.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims (25)

1. A starch size mixing system is characterized by comprising a metering tank (11), a conveying unit (12) and a size mixing tank (13); the metering tank (11) is provided with a feeding port (111) for feeding starch raw materials, a discharging port (112) of the metering tank (11) is connected with a feeding port (123) of the conveying unit (12), a discharging port (124) of the conveying unit (12) is connected with a feeding port (133) of the size mixing tank (13), and the size mixing tank (13) is provided with a water inlet (33), a pressure discharging port (136) and a size discharging port (134) for discharging starch size;
a spiral transmission area and a pre-pulp-mixing area are sequentially arranged in a pipeline of the conveying unit (12) along the material conveying direction, a spiral conveying mechanism is arranged in the spiral transmission area, and a first stirring mechanism and a water spraying mechanism are arranged in the pre-pulp-mixing area;
a central transmission rod (21) penetrating through the central parts of the spiral transmission area and the pre-pulp presetting area and driven to rotate by a first driving mechanism (121) is arranged in a pipeline of the conveying unit (12), the spiral conveying mechanism is circumferentially arranged on the central transmission rod (21), and one end of the first stirring mechanism is arranged on the central transmission rod (21);
a partition plate (41) is arranged between the spiral transmission area and the pre-slurry pre-mixing area, the upper end of the partition plate (41) is arranged on the top wall of a pipeline of the conveying unit (12), and the central transmission rod (21) vertically penetrates through the partition plate (41) and the lower edge (51) of the partition plate to be suspended below the central transmission rod (21);
the water spraying mechanism comprises a plurality of nozzles (45) arranged on the inner wall of the pipeline in the pre-pulp mixing area, the nozzles (45) are connected with a water conveying groove (56) arranged in the conveying unit (12), and the water conveying groove (56) is connected with a water storage groove (125) arranged above the conveying unit (12) through a pressure pump (53) and a first water conveying pipe (54);
the central transmission rod (21) is a solid rod (62) at the part of the spiral transmission area and is a hollow rod (61) at the part of the pre-pulp-mixing area, a water injection unit (42) is arranged at the joint of the hollow rod (61) and the solid rod (62) in an extending way towards one side of the hollow rod (61), a water injection port (63) of the water injection unit (42) is connected with a water storage tank (125) arranged above the conveying unit (12) through a pressure pump (53) and a second water conveying pipe (55), a water outlet is connected with the hollow rod (61), the water injection mechanism further comprises a water injection hole (44), and the water injection hole (44) is arranged on the peripheral wall of the hollow rod (61);
a plurality of air blowing holes (71) are formed in the pipeline wall of the conveying unit (12) below the partition plate (41), and the air blowing holes (71) are connected with the air blowing unit through air supply hoses (72).
2. Starch size mixing system according to claim 1, characterized in that the ratio of the length of the central transmission rod (21) in the screw conveyor area to the length in the pre-size mixing area is 1:1-1:3.
3. Starch size mixing system according to claim 2, characterized in that the ratio of the length of the central transmission rod (21) in the screw conveyor area to the length in the pre-size mixing area is 1:2.
4. Starch size mixing system according to claim 1, wherein the area of the partition (41) is 2/3 of the interface between the screw conveyor area and the pre-size area.
5. The starch size mixing system according to claim 2, wherein the first stirring mechanism comprises a first stirring rod (43) and a first stirring blade (431), one end of the first stirring rod (43) is fixed on the central transmission rod (21), and the other end is connected with the first stirring blade (431).
6. The starch size mixing system of claim 5 wherein the first stirring vane (431) is arcuate in shape, the arc of which matches the arc of the inner wall of the conduit of the pre-size zone such that the outer surface of the first stirring vane (431) is in seamless contact with the inner wall of the conduit.
7. The starch size mixing system according to claim 5, wherein the pre-sizing area is provided with a plurality of first stirring mechanisms, and one end of the first stirring rod (43) is symmetrically or alternately arranged on the central transmission rod (21).
8. Starch size mixing system according to claim 1, wherein the nozzle (45) is oval and the major axis of the oval is parallel to the central transmission rod (21).
9. The starch size mixing system according to claim 1, wherein the water storage tank (125) is placed on a support platform (52) fixed to the outer top of the conveying unit (12).
10. Starch pulping system according to claim 1, characterized in that the water jet holes (44) are staggered with respect to the nozzles (45).
11. Starch size mixing system according to claim 1, wherein the water jet holes (44) are oval holes with their long axes parallel to the central transmission rod (21).
12. Starch size mixing system according to claim 1, wherein the water jet holes (44) are distributed in a single row or in parallel rows along the hollow bar (61).
13. Starch size mixing system according to claim 1, characterized in that the first water pipe (54) and the second water pipe (55) are provided with water delivery control valves (551) for adjusting the flow.
14. The starch pulping system of claim 1, wherein a water storage space (65), a baffle (641) and a sealing space (642) are arranged in the shell of the water injection unit (42), the water storage space (65) is communicated with the water injection port (63), and the sealing space (642) is positioned between the inner wall of the shell of the water injection unit (42) and the outer wall of the water storage space (65) and is filled with a sealing material with low friction coefficient and water resistance;
a plurality of staggered hollow holes (66) are formed in the peripheral wall of the hollow rod (61) in the water storage space (65), one end of the baffle piece (641) is fixed on the hollow rod (61) at the front end and the rear end of the hollow hole (66), and the other end of the baffle piece extends to the sealing space (642).
15. The starch size mixing system of claim 14 wherein the sealing material is made of nitrile rubber, neoprene or polytetrafluoroethylene.
16. The starch size mixing system of claim 15 wherein the sealing material is polytetrafluoroethylene.
17. Starch size mixing system according to claim 1, wherein the conveying unit (12) is inclined downwards by 5 ° -10 ° from the inlet opening (123) to the outlet opening (124).
18. Starch size mixing system according to claim 1, characterized in that the metering tank (11) is mounted at a higher level than the conveying unit (12).
19. Starch size mixing system according to claim 1, characterized in that the angle (75) between the centre line (73) of the blow hole and the centre line (74) of the centre drive rod is 20-45 °.
20. Starch size mixing system according to claim 19, wherein the centre line (73) of the blow hole is at an angle (75) of 30 ° to the centre line (74) of the centre drive rod.
21. Starch size mixing system according to any one of claims 1-20, wherein a second stirring mechanism driven by a second driving mechanism (32) is arranged in the size mixing tank (13), the second stirring mechanism comprises a second stirring rod (131) and a second stirring blade (132), one end of the second stirring rod (131) is connected with a spiral groove (211) of the central transmission rod (21) through a driving gear (22) to form a driving conversion unit (122), and the other end of the second stirring rod is connected with the second stirring blade (132).
22. Starch size mixing system according to claim 21, characterized in that the starch size mixing system is provided with a plurality of size mixing tanks (13), the discharge opening (124) of the conveying unit (12) being connected with the feed opening (133) of each size mixing tank (13) through a distributing valve (31).
23. Starch size mixing system according to any of claims 1-20, characterized in that the starch size mixing system is provided with a general control unit for controlling controllable opening and closing or action elements arranged on the metering tank (11), the conveying unit (12), the size mixing tank (13) and the pipelines between them.
24. The starch size mixing system of claim 23 wherein the master control unit comprises a feeding control module, a delivery unit control module, a water spray control module, a blow control module, a stirring control module, and a size mixing control module.
25. A starch size mixing method, characterized in that, based on the starch size mixing system of any one of claims 1-24, the starch size mixing method performs pre-size mixing in a pre-size mixing area of a conveying unit (12) which conveys raw starch from a metering tank (11) to a size mixing tank (13), and then enters the size mixing tank (13) for formal size mixing, so as to obtain uniform and non-agglomerated starch size.
CN202211053624.0A 2022-08-31 2022-08-31 Starch size mixing system and size mixing method Active CN115463597B (en)

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