Corn fiber processing system and wet-grinding corn starch processing system using the same

Abstract

The present application provides a corn fiber processing system and a wet-milled corn starch processing system using the same. The corn fiber processing system includes a group of pressure curved sieves, a group of fiber washing tanks, an enzyme preparation dosing device, and an external enzyme reaction tank. The external enzyme reaction tank is used to receive the material on the sieve of the intermediate pressure curved sieve or the fiber slurry from the intermediate fiber washing tank, and provides a site for enzyme reaction, thereby extending the reaction time of the enzyme-related reaction. Furthermore, the reaction efficiency of the enzyme preparation can be further improved by adjusting the concentration of the fiber dry matter in the external enzyme reaction tank.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application was filed on December 21, 2018, and is related to a "corn fiber processing system and a corn wet grinding type starch processing system using the same (

number

[0002] The present application relates to the technical field of advanced corn processing, in particular to fiber processing equipment for extending enzyme reaction time during corn fiber washing, and more particularly to a corn fiber processing system and a corn wet mill starch processing system using the same. [Background technology]

[0003] Corn starch is a product made from corn kernels by soaking the kernels in sulfurous acid, crushing, screening, separating, washing, dehydrating and drying. At present, the corn starch wet milling method (i.e., corn starch wet production process) is commonly used for the advanced processing of corn starch. The purpose of corn starch production is to extract as much pure starch and various by-products (such as germ, protein, fiber, and other soluble substances) from the corn kernels as possible. As shown in Figure 1, the main procedures of corn starch production by corn starch wet milling method include the following steps: corn soaking, corn crushing and germ separation and washing, fine grinding, fiber washing and drying, gluten separation, protein separation and drying, starch washing, dehydration and drying, etc.

[0004] During the fiber washing procedure, it is necessary to use a corn fiber washing system. The corn fiber washing system is mainly composed of a multi-stage pressure curved sieve and a multi-stage fiber washing tank that cooperates with the pressure curved sieve. In order to enable the slurry containing corn fiber to release more free starch, bound starch, and corn protein during fiber washing, it is necessary to add an enzyme preparation to the fiber washing tank so that the enzyme preparation can carry out an enzyme reaction with the slurry containing corn fiber. However, because the residence time of the corn fiber in the fiber washing tank is short, the reaction time involving the enzyme is short, the reaction is insufficient, and the enzyme action efficiency is low. Summary of the Invention [Means for solving the problem]

[0005] In consideration of this, the present application provides a corn fiber processing system and a corn wet milling type starch processing system using the same. The corn fiber processing system includes a pressure curved screen group, a fiber washing tank group, an enzyme preparation adding device, and an external enzyme reaction tank, and the pressure curved screen group has multiple stages of pressure curved screens, and the pressure curved screens separate the fiber slurry containing starch and protein into a screen overflow and a screen underflow. the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group has a plurality of fiber washing tanks, each fiber washing tank stage has a sieve overflow supply port, a sieve underflow supply port and a discharge port; the enzyme preparation dosing device is used to dosing the enzyme preparation to the corn fiber processing system; the external enzyme reaction tank is connected to the discharge port of the intermediate-stage fiber washing tank, the external enzyme reaction tank is used to receive the fiber slurry in the intermediate-stage fiber washing tank and provide a place for enzyme reaction, and the fiber slurry is returned to the fiber slurry inlet of the next stage of the pressure curved sieve behind the intermediate-stage pressure curved sieve through the return pipe after a predetermined time.

[0006] Preferably, the enzyme preparation addition device is an enzyme preparation addition tube.

[0007] Preferably, the sieve overflow of the pressure curved sieve flows to a corresponding stage of a fiber washing tank in the group of fiber washing tanks, and the sieve underflow of the pressure curved sieve flows to a non-adjacent fiber washing tank before the corresponding stage of a fiber washing tank in the group of fiber washing tanks.

[0008] Preferably, the sieve overflow of the pressure curved sieve flows to a corresponding stage of a fiber washing tank in the group of fiber washing tanks, and the sieve bottom flow of the pressure curved sieve flows to a fiber washing tank one or two stages away from the corresponding stage of a fiber washing tank in the group of fiber washing tanks.

[0009] Preferably, the intermediate stage pressure curve sieve refers to any stage of pressure curve sieves other than the first stage of pressure curve sieves and the last stage of pressure curve sieves in the group of pressure curve sieves. More preferably, the intermediate stage pressure curve sieve refers to a pressure curve sieve in an intermediate position, i.e., if there is an odd number of pressure curve sieves, it refers to a pressure curve sieve in an intermediate position, or if there is an even number of pressure curve sieves, it refers to the first pressure curve sieve in an intermediate position.

[0010] Preferably, the intermediate stage fiber washing tank refers to any stage of the fiber washing tank other than the first stage of the fiber washing tank in the intermediate stage of the fiber washing tank group and the last stage of the fiber washing tank. More preferably, the intermediate stage fiber washing tank refers to a fiber washing tank at an intermediate position, i.e., when there are an odd number of fiber washing tanks, it refers to a fiber washing tank at an intermediate position, or when there are an even number of fiber washing tanks, it refers to the first fiber washing tank at an intermediate position.

[0011] Preferably, the corn fiber processing system further comprises a material feed buffer tank located before the group of fiber washing vessels.

[0012] Preferably, the corresponding first stage sieve flow of the pressure curved sieve flows to the gluten separation system, and the corresponding second stage sieve flow of the pressure curved sieve flows to the material feed buffer tank of the corn fiber system.

[0013] Preferably, the enzyme preparation addition device is an enzyme preparation addition tube.

[0014] Preferably, the sieve underflow contains sieve underflow washing water, and a sieve underflow washing water branch pipe is provided in the second stage of the pressure curved sieve behind the intermediate-stage pressure curved sieve, the sieve underflow washing water branch pipe is used to branch off a part of the sieve underflow washing water, thereby controlling the dry matter concentration in the external enzyme reaction tank, the residual sieve underflow washing water is conveyed to the sieve underflow supply port of the intermediate-stage fiber washing tank, and the branched sieve underflow washing water flows back to the corn fiber processing system by the sieve underflow washing water branch pipe.

[0015] Preferably, the end of the sieve flow cleaning water branch pipe is connected to a return pipe.

[0016] Preferably, the end of the sieve flow washing water branch pipe is provided at the upper end of the final discharge port of the external enzyme reaction tank.

[0017] Preferably, the end of the sieve flow washing water branch pipe is connected to the fiber slurry inlet of the next stage of pressure curved sieve behind the pressure curved sieve of the intermediate stage.

[0018] Preferably, the beginning of the sieve flow cleaning water branch pipe is provided on the pipe between the sieve flow outlet and the sieve flow supply port.

[0019] Preferably, the corn fiber processing system further comprises an external water storage buffer tank provided in the sieve flow washing water branch pipe.

[0020] Preferably, the corn fiber processing system further comprises a dry matter concentration meter, which is provided at the initial material inlet of the external enzyme reaction tank and is used to measure the dry matter concentration of the fiber slurry in the external enzyme reaction tank.

[0021] Preferably, the external enzyme reaction tank is a batch reaction tank, there are at least three external enzyme reaction tanks, and the fiber slurry is controlled by valves to simultaneously carry out feeding, enzyme reaction and discharge.

[0022] Preferably, at any one time, fiber slurry is supplied to only one of the external enzyme reaction tanks by the first valve, while fiber slurry is discharged from only one of the external enzyme reaction tanks by the second valve.

[0023] Preferably, each of the outer enzyme reaction tanks is equipped with an agitation device therein.

[0024] Preferably, the external enzyme reaction tank is a continuous reaction tank, and there are a plurality of external enzyme reaction tanks, which are connected in series, each of which includes a first agitator therein.

[0025] Preferably, the external enzyme reaction tank is a horizontal enzyme reaction tank having a plurality of horizontally arranged first compartments and second agitation devices corresponding to the first compartments, and the fiber slurry flows continuously through the first compartments.

[0026] Preferably, the external enzyme reaction tank is a vertical enzyme reaction tank having a plurality of vertically arranged second compartments and a third agitator corresponding to the second compartments, and the fiber slurry flows continuously through the second compartments.

[0027] The present application further provides a corn fiber processing system and a corn wet milling starch processing system using the same, the corn fiber processing system includes a pressure curved sieve group, a fiber washing tank group, an enzyme preparation adding device, and an external enzyme reaction tank, the pressure curved sieve group has multiple stages of pressure curved sieves, the pressure curved sieves are used to separate the fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, each stage of the pressure curved sieves has a fiber slurry inlet, a sieve overflow outlet, and a sieve underflow outlet, the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group has multiple stages of fiber washing tanks ... is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group has multiple stages of fiber washing tanks, the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group has multiple stages of fiber washing tanks, the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber washing tank group is used to provide a place for washing the fiber slurry with washing water, the fiber Each stage of the tank has a sieve overflow supply port, a sieve underflow supply port and a discharge port, an enzyme preparation adding device is used to add an enzyme preparation to the corn fiber processing system, an external enzyme reaction tank is connected to the sieve overflow outlet of the pressure curved sieve of the intermediate stage, the external enzyme reaction tank is used to receive the sieve overflow in the pressure curved sieve of the intermediate stage and provide a place for enzyme reaction, and the sieve overflow is returned to the fiber slurry inlet of the next stage of the pressure curved sieve behind the pressure curved sieve of the intermediate stage through a return pipe after a predetermined time.

[0028] Preferably, the external enzyme reaction tank has a water inlet for adjusting the fiber dry matter concentration in the external enzyme reaction tank.

[0029] Furthermore, the water inlet is externally connected to a water inlet pipe for adjusting the fiber dry matter concentration in the external enzyme reaction tank.

[0030] Preferably, the corn fiber processing system further comprises a first flow control device disposed at the water inlet and used to control the amount of water inlet received by the external enzyme reaction tank.

[0031] Additionally, the corn fiber processing system further includes a wash water injection adjusting device that correspondingly reduces the amount of wash water injected into the corn fiber processing system depending on the amount of water injection so as to keep the total amount of water in the corn fiber processing system constant.

[0032] Preferably, the corn fiber processing system further comprises a second flow control device disposed at the wash water inlet of the corn fiber processing system and used to control the amount of water inflow of the external wash water into the corn fiber processing system.

[0033] Further, the enzyme preparation adding device is an enzyme preparation adding tube.

[0034] Preferably, the external enzyme reaction tank is a horizontal enzyme reaction tank having a plurality of horizontally arranged first compartments and first agitation devices corresponding to the first compartments, and the fiber slurry flows continuously through the first compartments.

[0035] Preferably, the horizontal enzyme reaction tank has a plurality of vertically staggered semi-closed separators, which are used to divide the horizontal enzyme reaction tank into a plurality of first compartments.

[0036] Furthermore, the external enzyme reaction tank is a plurality of continuous reaction tanks which are connected in series and each of which is equipped with a second agitator therein.

[0037] Preferably, the external enzyme reaction tank is a vertical enzyme reaction tank having a plurality of vertically arranged second compartments and a third agitator corresponding to the second compartments, and the fiber slurry flows continuously through the second compartments.

[0038] The present disclosure further provides a corn wet-mill starch processing system, which includes any corn fiber processing system selected from the specific embodiments described above.

[0039] Preferably, the corn wet-milling starch processing system includes a corn crushing system, a germ separation and washing system, a fine grinding system, a fiber processing system, a fiber dehydration and drying system, a gluten separation system, a protein separation and drying system, and a starch washing, dehydration and drying system.

[0040] According to the above-mentioned specific embodiments of the present application, the corn fiber processing system and the corn wet-milling starch processing system using the same have at least the following beneficial effects: by conveying the fiber slurry of the intermediate-stage fiber washing tank to the external enzyme reaction tank, or by directly conveying the sieve overflow (sieve overflow fiber) of the intermediate-stage pressure curved sieve to the external enzyme reaction tank, the reaction time involving the enzyme preparation is extended, allowing the enzyme preparation to be fully involved in the reaction, improving the efficiency of the enzyme reaction, and increasing the yield of corn starch and / or corn protein, thereby increasing the economic benefits.

[0041] It is to be understood that the above summary and the following specific embodiments are exemplary and explanatory only and are not intended to limit the scope of the invention as claimed in the present application.

[0042] The following accompanying drawings constitute a part of the specification of this application and illustrate exemplary embodiments of the present application, and are used together with the description to explain the principles of the present application. [Brief description of the drawings]

[0043] [Figure 1] FIG. 1 is a flow diagram of corn starch wet milling production in the prior art and a process water circulation diagram. [Diagram 2] FIG. 1 is a structural schematic diagram of a corn fiber processing system for extracting corn starch provided in certain embodiments of the present application. [Diagram 3] FIG. 1 is a structural schematic diagram of a corn fiber processing system for extracting corn starch provided in certain embodiments of the present application. [Figure 4] 1 is a curve graph showing the relationship between fiber dry matter concentration and relative yields of starch and protein on fiber as provided in certain embodiments of the present application. [Diagram 5] FIG. 2 is a structural schematic diagram of the connection of the end of the sieve flow cleaning water branch pipe to the return pipe provided in a specific embodiment of the present application. [Figure 6]FIG. 2 is a structural schematic diagram of the arrangement of the end of the sieve flow washing water branch pipe at the upper end of the final discharge port of the external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 7] FIG. 1 is a structural schematic diagram of a corn fiber processing system for extracting corn starch provided in certain embodiments of the present application. [Figure 8] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 9] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 10] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 11] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 12] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 13] FIG. 1 is a structural schematic diagram of a corn fiber processing system for extracting corn starch provided in certain embodiments of the present application. [Figure 14] FIG. 1 is a structural schematic diagram of a corn fiber processing system for extracting corn starch provided in certain embodiments of the present application. [Figure 15] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 16] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 17] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 18] FIG. 2 is a structural schematic diagram of an external enzyme reaction tank provided in a specific embodiment of the present application. [Figure 19] FIG. 1 is a structural schematic diagram of a corn wet-grinding starch processing system provided in certain embodiments of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly show the gist of the contents disclosed in the present application with reference to the accompanying drawings and detailed description. After understanding the embodiments of the contents of the present application, those skilled in the art will be able to make changes and modifications from the technology of the teachings of the contents of the present application without departing from the spirit and scope of the contents of the present application.

[0045] The illustrative embodiments and the description thereof are used to explain the present application, but are not intended to limit the present application. Furthermore, elements / members with the same or similar reference numbers used in the accompanying drawings and embodiments are used to represent the same or similar parts.

[0046] The terms "first," "second," ..., etc., used in this specification do not denote any particular order or sequence or serve to limit the present application, but are used solely to distinguish between elements or operations that are described using the same technical terminology.

[0047] Any directional terms used herein, such as up, down, left, right, front or back, are merely directions with reference to the accompanying drawings, and therefore the directional terms used are used to describe the present invention and are not limiting.

[0048] As used herein, the words "including," "comprising," "having," "containing," and the like are all open terms, meaning including, but not limited to.

[0049] As used herein, the term "and / or" includes any and all combinations of the listed items.

[0050] As used herein, the term "plurality" includes "two" and "more than two," and as used herein, the term "groups" includes "groups of two" and "more than two groups."

[0051] As used herein, the words "roughly", "about" and the like are used to modify amounts or errors that may vary slightly without changing the essence thereof, and generally, the range of slight changes or errors modified by such words may be 20% in some embodiments, 10% in some embodiments, and 5% in some embodiments or other values. Those skilled in the art should understand that the above values ​​may be adjusted according to actual needs, and are not limited thereto.

[0052] In the textile washing process, an enzyme preparation needs to be added to the textile processing system to separate more free starch, bound starch, and corn protein from the slurry containing corn fiber. The enzyme preparation can reduce the hydrophilicity of cellulose and hemicellulose, reduce the moisture content of the textile material, improve the concentration and drying efficiency, and reduce the amount of steam used for concentration and drying, thereby saving energy consumption. In the prior art, the enzyme reacts with the textile slurry in the textile washing tank. However, because the residence time of the corn fiber in the textile washing tank is short, the reaction time involving the enzyme is short, the reaction is insufficient, and the enzyme action efficiency is low.

[0053] In a preferred embodiment of the present application, an external enzyme reaction tank is provided in the intermediate stage fiber washing tank to receive the fiber slurry in the intermediate stage fiber washing tank, and the fiber slurry is retained in the external enzyme reaction tank for a certain time (for example, the contact reaction time distribution of most of the fiber slurries in the external enzyme reaction tank is 90 minutes to 240 minutes, and the average contact reaction time is 150 minutes). While the fiber slurry is retained in the external enzyme reaction tank, the enzyme continues to react with the fiber slurry in the external enzyme reaction tank, and after a certain time, the fiber slurry is returned from the external enzyme reaction tank to the fiber slurry inlet of the next stage of the pressure curved sieve behind the pressure curved sieve of the intermediate stage, which can effectively extend the reaction time involved in the enzyme preparation, allow the enzyme preparation to be fully involved in the reaction, minimize the hydrophilicity of cellulose and hemicellulose, increase the starch yield, improve the reaction efficiency of the enzyme preparation, and reduce the wastewater generated in the production of corn starch by wet grinding.

[0054] In addition, in the existing corn wet-grinding fiber washing process, the sieve overflow fiber from the corresponding stage of the pressure curved sieve and the sieve underflow washing water from the stage two steps behind the pressure curved sieve may be mixed together in the fiber washing tank, and the fiber dry matter concentration of the fiber slurry in the fiber washing tank cannot be freely adjusted.

[0055] Fiber dry matter concentration can affect the activity of the enzyme preparation. In the preferred embodiment of the present application, the fiber dry matter concentration during the enzyme preparation reaction should be 4%-6% to obtain optimal performance (non-fiber dry matter in the fiber slurry is washed through a 75 micron sieve). This is because a low fiber dry matter concentration will reduce the enzyme activity, and a high fiber dry matter concentration will increase the viscosity, which is unfavorable to the continuous operation of the material in the system.

[0056] In a preferred embodiment of the present application, a sieve-underflow washing water branch pipe is provided in the second stage of the pressure curved sieve behind the pressure curved sieve of the intermediate stage, and the sieve-underflow washing water branch pipe is used to branch off a part of the sieve-underflow washing water, for example, to allow a part of the washing water to bypass the external enzyme reaction tank without mixing with the fiber slurry. The flow of the branched washing water is controlled by a valve, thereby having the function of adjusting the fiber dry matter concentration in the external enzyme reaction tank, and adjusting the dry matter concentration of the fiber mixture in the external enzyme reaction tank, so as to further improve the action of the enzyme.

[0057] In a preferred embodiment of the present application, taking the existing process in the factory as an example, the sieve overflow fiber dry matter content in the stage before the pressure curved sieve is about 7%-8%, and its flow rate is 40m 3 / h, and the flow rate of the sieve wash water behind the pressure curved sieve is 110m 3 / h, and after mixing, the fiber dry matter concentration in the external enzyme reaction tank was about 2%, and the 70m 3 / h of washing water is divided into 40m 3 If 10000000 / h of washing water is allowed to enter the external enzyme reaction tank and mix with the fiber material, the fiber dry matter concentration in the external enzyme reaction tank can be increased to 3.5%-4%, so that the reaction performance of the enzyme preparation is improved.

[0058] In the preferred embodiment of the present application, the pressure curved sieve of the intermediate stage specifically refers to the pressure curved sieve other than the pressure curved sieves on both sides in the pressure curved sieve group, that is, any pressure curved sieve other than the leftmost pressure curved sieve and the rightmost pressure curved sieve. The sieve overflow outlet of the pressure curved sieve of the intermediate stage is connected to an external enzyme reaction tank, and the sieve overflow outlet of the pressure curved sieve of the intermediate stage may no longer communicate with the sieve overflow supply point of the corresponding fiber washing tank, or a valve can be further provided on the pipe between the sieve overflow outlet of the pressure curved sieve of the intermediate stage and the sieve overflow supply point of the corresponding fiber washing tank, so that the valve is used to cut off the communication between the sieve overflow outlet of the pressure curved sieve of the intermediate stage and the sieve overflow supply point of the corresponding fiber washing tank.

[0059] In a preferred embodiment of the present application, the sieve overflow of the intermediate stage pressure curved sieve can be conveyed out of the corn fiber processing system for enzyme reaction, and the sieve overflow can be returned to the fiber slurry inlet of the next stage of the pressure curved sieve behind the intermediate stage pressure curved sieve through a return pipe after a certain time, and then the sieve overflow is returned to the corn fiber processing system. The reaction time involving the enzyme preparation can be extended to allow the enzyme preparation to react completely and improve the working efficiency of the enzyme preparation.

[0060] In a preferred embodiment of the present application, the sieve overflow outlet of the intermediate-stage pressure curved sieve can be connected to an external enzyme reaction tank, and the sieve overflow of the intermediate-stage pressure curved sieve can be conveyed to the external enzyme reaction tank outside the corn fiber processing system for enzyme reaction, so that the relative yield of starch and protein is high without considering the material continuous operation performance of the system.

[0061] In the existing corn wet milling fiber washing process, the sieve overflow fiber (sieve overflow) from the corresponding stage of the pressure curved sieve and the sieve underflow washing water (sieve underflow) from the pressure curved sieve two stages behind can be combined in the fiber washing tank, and the fiber dry matter concentration of the fiber slurry in the fiber washing tank cannot be adjusted freely. The fiber dry matter concentration may affect the activity of the enzyme, because the lower the fiber dry matter concentration, the lower the enzyme activity of the enzyme preparation, while the higher the fiber dry matter concentration, the higher the viscosity, which is unfavorable to the continuous operation of the material (specifically the sieve overflow or sieve overflow fiber) in the system.

[0062] In the preferred embodiment of the present application, to obtain optimal performance, the wash water can be directly flowed into the external enzyme reaction tank, and the fiber dry matter concentration during the enzyme preparation reaction can be adjusted to 4%-6% (non-fiber dry matter in the fiber slurry was washed through a 75 micron sieve).

[0063] In a preferred embodiment of the present application, taking the existing process in the factory as an example, the sieve overflow fiber dry matter content in the stage before the pressure curved sieve is about 7%-8%, and its flow rate is 40m 3 / h, and 30 m to dilute the sieve overflow in the external enzyme reaction tank. 3 When / h of washing water is introduced into the external enzyme reaction tank, the fiber dry matter concentration in the external enzyme reaction tank can be adjusted to 5.24%-6%, so that the enzyme preparation has better reaction performance.

[0064] The enzyme reaction time can be calculated by dividing the effective volume of the external enzyme reaction tank by the total flow rate of the fiber slurry, where the total flow rate of the fiber slurry includes the fiber flow rate (sieve overflow rate) and the wash water flow rate (sieve underflow rate). By dividing a part of the wash water flow rate, the total inflow rate to the enzyme reaction tank is reduced, and as a result, the enzyme reaction time can be extended without changing the effective volume of the external enzyme reaction tank.

[0065] EMBODIMENT 1 2, a corn fiber processing system for extracting corn starch may include a pressure curved sieve group 1, a fiber washing tank group 2, an enzyme preparation dosing device 3, and an external enzyme reaction tank 4. The pressure curved sieve group 1 corresponds to the fiber washing tank group 2.

[0066] The pressure curved sieve group 1 has a multi-stage pressure curved sieve 11, which is used to separate a fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, and each stage of the pressure curved sieve 11 has a fiber slurry inlet 111, a sieve overflow outlet 112, and a sieve underflow outlet 113. For the sake of convenience, it is assumed that the pressure curved sieve group 1 has six stages of pressure curved sieves 11, including pressure curved sieve N-2 (corresponding to the first stage of pressure curved sieves), pressure curved sieve N-1 (corresponding to the second stage of pressure curved sieves), pressure curved sieve N (i.e., the pressure curved sieve of the middle stage), pressure curved sieve N+1 (i.e., the next stage of pressure curved sieves behind the pressure curved sieve of the middle stage), pressure curved sieve N+2 (i.e., the second stage of pressure curved sieves behind the pressure curved sieve of the middle stage), and pressure curved sieve N+3 (i.e., the third stage of pressure curved sieves behind the pressure curved sieve of the middle stage). The sieve overflow mainly contains wet fiber, attached starch, and protein, and the sieve underflow mainly contains sieve underflow washing water, starch, protein, and the like. The first stage of the sieve underflow (the sieve underflow output from the sieve underflow outlet 113 of the pressure curved sieve N-2) is crude starch milk, and the second stage of the sieve underflow (the sieve underflow output from the sieve underflow outlet 113 of the pressure curved sieve N-1) comes from the sieve underflow separated from the previous stage of the pressure curved sieve (pressure curved sieve N), and the starch milk concentration is gradually decreased. Preferably, the pressure curved sieve in the middle stage refers to any stage of the pressure curved sieve except the first stage of the pressure curved sieve and the last stage of the pressure curved sieve in the pressure curved sieve group. More preferably, the pressure curved sieve in the middle stage refers to the pressure curved sieve in the middle position, i.e., if the number of pressure curved sieves is odd, it refers to the pressure curved sieve in the middle position, or if the number of pressure curved sieves is even, it refers to the first pressure curved sieve in the middle position. As shown in FIG. 2, the pressure curved sieve in the intermediate stage is referred to as pressure curved sieve N.

[0067] Further, the corresponding first stage sieve flow of the pressure curve sieve 11 flows to the gluten separation system, and the corresponding second stage sieve flow of the pressure curve sieve 11 flows to the material supply buffer tank 22 of the corn fiber system.

[0068] In a specific embodiment of the present application, the pressure curved sieve 11 is used to separate the fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, the sieve overflow of the pressure curved sieve 11 flows through the sieve overflow outlet 112 to the corresponding stage of the fiber washing tank 21 of the fiber washing tank group 2, and the sieve underflow of the pressure curved sieve 11 flows through the sieve underflow outlet 113 to the fiber washing tank 21 before the corresponding stage of the fiber washing tank 21 of the fiber washing tank group 2, and the fiber washing tank 21 connected to the sieve overflow outlet 112 of the pressure curved sieve 11 is not adjacent to the fiber washing tank 21 connected to the sieve underflow outlet 113 of the pressure curved sieve 11, and is preferably separated by one or two stages of the fiber washing tank 21. In a preferred embodiment of the present application, the sieve flow of the pressure curved sieve 11 flows through the sieve flow outlet 113 into a small material compartment of a fiber washing tank 21 which is supplied with material by the pressure curved sieve in the fiber washing tank group 2, and overflows through the small material compartment into the previous fiber washing tank 21.

[0069] In a preferred embodiment of the present application, the fiber washing tank 21 connected to the sieve overflow outlet 112 of the pressure curved sieve 11 is separated by one or two stages of fiber washing tanks 21 from the fiber washing tank 21 connected to the sieve underflow outlet 113 of the pressure curved sieve 11. As shown in Fig. 2, the fiber washing tank 21 connected to the sieve overflow outlet 112 of the pressure curved sieve 11 is separated by one stage of fiber washing tanks 21 from the fiber washing tank 21 connected to the sieve underflow outlet 113 of the pressure curved sieve 11, and the pressure curved sieve N-2 supplies the sieve overflow fiber dry material to the fiber washing tank N-2, and the sieve underflow washing water is then supplied to the gluten separation system. The pressure curved sieve N-1 supplies the sieve overflow fiber dry material to the fiber washing tank N-1, and the sieve underflow washing water is then supplied to the washing tank N-3 (i.e., material supply buffer tank) located in front. The pressure curved sieve N supplies the sieve overflow fiber dry material to the fiber washing tank N and the sieve underflow washing water is then supplied to the fiber washing tank N-2. The pressure curved sieve N+1 supplies the sieve overflow fiber dry material to the fiber washing tank N+1 and the sieve underflow washing water is then supplied to the fiber washing tank N-1. The pressure curved sieve N+2 supplies the sieve overflow fiber dry material to the fiber washing tank N+2 and the sieve underflow washing water is then supplied to the fiber washing tank N. The pressure curved sieve N+3 supplies the sieve overflow fiber dry material to the fiber washing tank N+3 and the sieve underflow washing water is then supplied to the fiber washing tank N+1.

[0070] The above is only one embodiment of the present application, and the pressure curved sieve group 1 and the fiber washing tank group 2 can also be adapted as follows: the fiber washing tank 21 connected to the sieve overflow outlet 112 of the pressure curved sieve 11 is separated by two stages from the fiber washing tank 21 connected to the sieve underflow outlet 113 of the pressure curved sieve 11, and the pressure curved sieve N-2 supplies the sieve overflow fiber dry material to the fiber washing tank N-2, and the sieve underflow washing water is then supplied to the gluten separation system. The pressure curved sieve N supplies the sieve overflow fiber dry material to the fiber washing tank N, and the sieve underflow washing water is then supplied to the gluten separation system. The pressure curved sieve N supplies the sieve overflow fiber dry material to the fiber washing tank N, and the sieve underflow washing water is then supplied to the fiber washing tank N-3 located in front. The pressure curved sieve N+1 supplies the sieve overflow fiber dry material to the fiber washing tank N+1, and the sieve underflow washing water is then supplied to the fiber washing tank N-2. The pressure curved sieve N+2 supplies the sieve overflow fiber dry material to the fiber washing tank N+2, and the sieve underflow washing water is then supplied to the fiber washing tank N-1. The pressure curved sieve N+3 supplies the sieve overflow fiber dry material to the fiber washing tank N+3, and the sieve underflow washing water is then supplied to the fiber washing tank N, which are not limited thereto in the present application.

[0071] The fiber washing tank group 2 is used to provide a place for washing the fiber slurry with washing water, and the fiber washing tank group 2 has multiple stages of fiber washing tanks 21, and each stage of the fiber washing tank 21 has a sieve overflow supply port 211, a sieve underflow supply port 212 and a discharge port 213. Similarly, for convenience of explanation, it is assumed that the fiber washing tank group 2 has six stages of fiber washing tanks 21, including fiber washing tank N-2, fiber washing tank N-1, fiber washing tank N (i.e., a fiber washing tank in an intermediate stage), fiber washing tank N+1, fiber washing tank N+2 and fiber washing tank N+3. Preferably, the intermediate stage fiber washing tank refers to any stage of the fiber washing tank other than the first stage of the fiber washing tank and the last stage of the fiber washing tank in the intermediate stage of the fiber washing tank group. More preferably, the intermediate stage fiber washing tank refers to a fiber washing tank in an intermediate position. When the number of fiber cleaning tanks is an odd number, the intermediate stage fiber cleaning tank refers to the fiber cleaning tank at the intermediate position, and when the number of fiber cleaning tanks is an even number, the intermediate stage fiber cleaning tank refers to the first fiber cleaning tank at the intermediate position.

[0072] In addition, for temporary storage of fiber slurry and better control of the fiber washing process, the front end of the fiber washing tank N-2 can further be provided with a forwardly disposed washing tank N-3. The forwardly disposed washing tank N-3 is also called the material supply buffer tank 22, which receives the sieved flow of the corresponding second stage (i.e., the pressure curved sieve N-1) of the pressure curved sieve 11 and the fiber material produced by the fine grinding system, and the sieved flow and the fiber material are thoroughly mixed in the material supply buffer tank 22 to form a fiber slurry. In order to realize the countercurrent washing of corn fiber, the pressure curved sieve group 1 and the fiber washing tank group 2 are arranged in coordination, the fiber slurry output from the discharge port 213 of the fiber washing tank 21 is conveyed to the next stage of the pressure curved sieve 11, the fiber dry material output from the sieve overflow outlet 112 of the pressure curved sieve 11 is conveyed to the corresponding fiber washing tank 21, and the sieve underflow washing water output from the sieve underflow outlet 113 of the pressure curved sieve 11 is conveyed to the two upper stages of the fiber washing tank 21, thus realizing the movement of the fiber dry material from the lower stage of the fiber washing tank 21 to the upper stage of the fiber washing tank 21, and the movement of the sieve underflow washing water from the upper stage of the fiber washing tank 21 to the lower stage of the fiber washing tank 21, thereby realizing the countercurrent washing of corn fiber. For example, the fiber slurry output from the discharge port 213 of the fiber washing tank N+2 is transported to the pressure curved sieve N+3, the sieve overflow fiber dry material output from the sieve overflow outlet 112 of the pressure curved sieve N+3 is transported to the fiber washing tank N+3, and the sieve underflow washing water output from the sieve underflow outlet 113 of the pressure curved sieve N+3 is transported to the fiber washing tank N+1.

[0073] The enzyme preparation adding device 3 is used to add the enzyme preparation to the corn fiber processing system. The enzyme preparation reacts with the fiber slurry, so that the fiber slurry separates more free starch, bound starch and corn protein. The enzyme preparation adding device 3 can be an enzyme preparation adding tube, and the enzyme preparation adding tube 3 can be connected to the input tube of the external enzyme reaction tank 4, as shown in FIG. 2. In addition, the enzyme preparation adding tube 3 can also be connected to the input tube of the intermediate stage fiber washing tank 21', and the enzyme preparation adding tube 3 can also be connected to the intermediate stage fiber washing tank 21'. The enzyme preparation can be added manually through the enzyme preparation adding tube 3, and can also be added through the enzyme preparation adding tube 3 by using a pump, but is not limited thereto in the present application.

[0074] The external enzyme reaction tank 4 is connected to the discharge port 213 of the intermediate stage fiber washing tank 21', and the external enzyme reaction tank 4 is used to receive the fiber slurry in the intermediate stage fiber washing tank 21' and provide a place for enzyme reaction. After a certain time, the fiber slurry in the external enzyme reaction tank 4 is returned to the fiber slurry inlet 111 of the next stage of the pressure curved sieve 11 behind the pressure curved sieve 11' of the intermediate stage through the return pipe 41. The external enzyme reaction tank 4 can be a tank combination composed of one tank or multiple tanks according to the requirements of the equipment space and the residence time of the fiber slurry. The specific shape of the external enzyme reaction tank 4 will be described in the following embodiment, which will not be repeated in this specification in view of the length. Assuming that the fiber washing tank group 2 has six stages of fiber washing tanks 21 and the pressure curved sieve group 1 has six stages of pressure curved sieves 11, as shown in FIG. 2, the intermediate stage fiber washing tank 21' is the fiber washing tank N, and the next stage of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11' is the pressure curved sieve N+1.

[0075] Furthermore, in order to ensure that the fiber slurry flows smoothly inside the external enzyme reaction tank 4, a pump may be provided at the initial material inlet 43 and / or the return pipe 41 of the external enzyme reaction tank 4 to promote the flow of the fiber slurry.

[0076] EMBODIMENT 2 Referring to FIG. 3, the fiber dry matter concentration of the fiber slurry may affect the work of the enzyme preparation, and in order to achieve a better work of the enzyme preparation, the fiber dry matter concentration should be 4%-6% (non-fiber dry matter in the fiber slurry is washed out by a 75 micron sieve). A low fiber dry matter concentration may reduce the work of the enzyme, while a high fiber dry matter concentration may increase the viscosity of the fiber slurry, which is unfavorable to the continuous operation of the fiber slurry in the fiber processing system. Therefore, controlling the fiber dry matter concentration of the fiber slurry is beneficial to further improve the work of the enzyme. According to the above description of embodiment 1, the fiber slurry in the intermediate stage fiber washing tank 21' is directly conveyed to the external enzyme reaction tank, and the fiber dry matter concentration of the fiber slurry in the external enzyme reaction tank is about 2%. Although the reaction time of the enzyme preparation is extended, the fiber dry matter concentration of the fiber slurry in the external enzyme reaction tank is less than 4%, which cannot improve the work of the enzyme preparation.

[0077] In this embodiment, a sieve flow cleaning water branch pipe 5 is provided in the second stage of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11', and the sieve flow cleaning water branch pipe 5 is used as a branch part of the sieve flow cleaning water, thereby controlling the dry matter concentration (fiber dry matter concentration) in the external enzyme reaction tank 4, and the remaining sieve flow cleaning water is conveyed to the intermediate stage fiber cleaning tank 21', and the branched sieve flow cleaning water returns to the corn fiber processing system through the sieve flow cleaning water branch pipe 5. Since the fiber slurry in the intermediate stage fiber cleaning tank 21' is conveyed to the external enzyme reaction tank 4, the sieve flow cleaning water that is originally conveyed to the external enzyme reaction tank 4 through the intermediate stage fiber cleaning tank 21' is branched by the sieve flow cleaning water branch pipe 5, as a result, the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4 is 4% to 6%, and the enzyme preparation is in a favorable reaction state. The branching ratio of the sieve wash water is determined by the sieve overflow fiber dry matter content, the flow of the stage before the pressure curve sieve and the flow of the sieve wash water of the stage after the pressure curve sieve. In order not to change the dry matter concentration of the fiber slurry in the stage other than the intermediate stage of the original corn fiber processing system, the sieve wash water branched by the sieve wash water branching pipe 5 merges with the fiber slurry in the reaction tank at the outlet of the external enzyme reaction tank, and thus finally returns to the corn fiber processing system.

[0078] Figure 4 is a curve graph showing the relationship between fiber dry matter concentration and the relative yield of starch and protein on fiber. From Figure 4, it can be seen that when the fiber dry matter concentration is 4%-6%, the relative yield of starch and protein on fiber is more than 80%. The specific calculation method of the above fiber dry matter concentration includes: take 200g of fiber slurry from the external enzyme reaction tank, wash the fiber slurry with water on a 75 micron sieve to wash away dry matter other than fiber, dry the sieve overflow fiber in an oven at 105°C to absolute dry weight, measure the weight, and calculate the fiber dry matter concentration by dividing the absolute dry weight by the total weight of 200g.

[0079] Furthermore, the sieve underflow washing water branch pipe 5 can be provided in the sieve underflow washing water output pipe of any stage of the pressure curved sieve 11 behind the pressure curved sieve 11' of the intermediate stage, as long as the sieve underflow washing water discharged from the sieve underflow outlet 113 of such stage of the pressure curved sieve 11 is conveyed to the fiber washing tank 21' of the intermediate stage. Preferably, the sieve underflow washing water of the pressure curved sieve 11 is conveyed to the corresponding stage of the fiber washing tank 21, the sieve overflow fiber dry material of the pressure curved sieve 11 is conveyed to the fiber washing tank 21 before the corresponding stage of the fiber washing tank 21, and the corresponding stage of the fiber washing tank 21 of the pressure curved sieve 11 is separated from the fiber washing tank 21 before the corresponding stage of the fiber washing tank 21 of the pressure curved sieve 11 by at least one stage of the fiber washing tank. The sieve flow cleaning water branch pipe 5 is provided in the sieve flow cleaning water output pipe of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11', the sieve flow cleaning water of the pressure curved sieve 11 is conveyed to the intermediate stage fiber cleaning tank 21', and the sieve flow cleaning water branch pipe 5 is used to branch a part of the sieve flow cleaning water so as to control the fiber dry matter concentration in the external enzyme reaction tank 4. The remaining sieve flow cleaning water is conveyed to the intermediate stage fiber cleaning tank 21', and the branched sieve flow cleaning water returns to the corn fiber processing system via the sieve flow cleaning water branch pipe 5.

[0080] More preferably, the sieve underflow washing water of the pressure curved sieve 11 is conveyed to the corresponding stage of the fiber washing tank 21, the sieve overflow fiber dry matter of the pressure curved sieve 11 is conveyed to the fiber washing tank 21 before the corresponding stage of the fiber washing tank 21, and the corresponding stage of the fiber washing tank 21 of the pressure curved sieve 11 is separated from the fiber washing tank 21 before the corresponding stage of the fiber washing tank 21 of the pressure curved sieve 11 by one stage of the fiber washing tank 21. The sieve underflow washing water branch pipe 5 is provided in the sieve underflow washing water output pipe of the second stage of the pressure curved sieve 11 behind the pressure curved sieve 11' of the intermediate stage, the sieve underflow washing water of the pressure curved sieve 11 is conveyed to the fiber washing tank 21' of the intermediate stage, and the sieve underflow washing water branch pipe 5 is used to branch a part of the sieve underflow washing water so as to control the dry matter concentration of the external enzyme reaction tank 4. The remaining sieve flow washing water is conveyed to the intermediate stage fiber washing tank 21', and the branched sieve flow washing water is returned to the corn fiber processing system via the sieve flow washing water branch pipe 5.

[0081] One sieve-underflow washing water branch pipe 5 is attached to the second-stage sieve-underflow washing water conveying pipe of the pressure curved sieve 11 behind the intermediate-stage pressure curved sieve 11', so that a part of the washing water bypasses the external enzyme reaction tank 4 without mixing with the sieve-overflow fiber dry matter output from the sieve overflow outlet 112 of the intermediate-stage fiber washing tank 21', and the flow of the branched washing water is controlled by a valve so as to have the function of adjusting the fiber dry matter concentration in the external enzyme reaction tank 4.

[0082] The sieve flow cleaning water branched by the sieve flow cleaning water branch pipe 5 can return to the corn fiber processing system at different positions in the corn fiber processing system. The sieve flow cleaning water of the pressure curved sieve 11 is branched by the beginning of the sieve flow cleaning water branch pipe 5, and the end of the sieve flow cleaning water branch pipe 5 allows the branched sieve flow cleaning water to return to the corn fiber processing system. As shown in Figure 5, the end of the sieve flow cleaning water branch pipe 5 can be connected to the return pipe 41 of the external enzyme reaction tank 4, and the branched sieve flow cleaning water is transported to the return pipe 41, and the branched sieve flow cleaning water returns to the corn fiber processing system. The end of the sieve-underflow washing water branch pipe 5 can be located at the upper end of the final discharge port 42 of the external enzyme reaction tank 4, and the branched sieve-underflow washing water is discharged from the external enzyme reaction tank 4 together with the fiber slurry in the external enzyme reaction tank 4, and then conveyed to the next stage of the pressure curved sieve 11 behind the intermediate-stage pressure curved sieve 11'. In the process of discharging the fiber slurry from the external enzyme reaction tank 4, the branched sieve-underflow washing water can be thoroughly mixed with the fiber slurry in the external enzyme reaction tank 4, as shown in FIG. 6. The end of the sieve underflow cleaning water branch pipe 5 can also be connected to the fiber slurry inlet 111 of the next stage of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11', so that the branched sieve underflow cleaning water is directly transported to the next stage of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11', i.e., the branched sieve underflow cleaning water is directly transported to the fiber slurry inlet 111 of the pressure curved sieve N+1, as shown in Figure 3.

[0083] EMBODIMENT 3 As shown in Fig. 7, in order to effectively buffer the sieve underflow cleaning water branched by the sieve underflow cleaning water branch pipe 5, an external water storage buffer tank 6 can be provided on the sieve underflow cleaning water branch pipe 5. The external water storage buffer tank 6 can temporarily store the sieve underflow cleaning water branched by the sieve underflow cleaning water branch pipe 5, so that the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4 can be effectively controlled when the flow rate of the sieve underflow cleaning water in the stage behind the pressure curved sieve is relatively large. The sieve underflow cleaning water of the pressure curved sieve 11 is branched by the sieve underflow cleaning water branch pipe 5, and the proportion of the sieve underflow cleaning water is determined by the sieve overflow fiber dry matter content and the flow rate of the stage before the pressure curved sieve and the flow rate of the sieve underflow cleaning water in the stage behind the pressure curved sieve.

[0084] EMBODIMENT 4 In the corn fiber processing system of embodiment 1 and embodiment 2 of the present application, the sieve overflow fiber dry matter from the stage before the pressure curved sieve 11 and the sieve flow washing water from the stage after the pressure curved sieve 11 are merged in the external enzyme reaction tank 4 and mixed uniformly to reach a relatively stable fiber dry matter concentration. According to the present application, the proportion of the sieve flow washing water branched by the sieve flow washing water branch pipe 5 according to the fiber dry matter concentration is adjustable, so that the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4 can be maintained at 4%-6%, and the enzyme preparation is in a favorable reaction state.

[0085] Furthermore, the proportion of the sieve flow cleaning water branched by the sieve flow cleaning water branch pipe 5 can be intelligently controlled by installing an electromagnetic flowmeter and a solenoid valve in the sieve flow cleaning water branch pipe 5, i.e., the valve installed in the sieve flow cleaning water branch pipe 5 is a solenoid valve, a controller is provided and electrically connected to the solenoid valve, and the opening degree of the solenoid valve is controlled by the controller according to the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4, thereby realizing intelligent control of the proportion of the sieve flow cleaning water branched by the sieve flow cleaning water branch pipe 5. For example, when the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4 is lower than 4%-6%, the opening degree of the solenoid valve is increased, and when the dry matter concentration of the fiber slurry in the external enzyme reaction tank 4 is higher than 4%-6% and the viscosity of the fiber slurry is too high, the opening degree of the solenoid valve is decreased. The solenoid valve is, for example, a pneumatic flow control valve, the pneumatic flow control valve is, for example, a Siemens VVF43 pneumatic flow control valve, and the electromagnetic flow meter is, for example, a Siemens SITRANS FM MAG1100 electromagnetic flow meter.

[0086] EMBODIMENT 5 In the corn fiber processing system of embodiment 1 and embodiment 2 of the present application, the external enzyme reaction tank 4 can be a batch reaction tank. As shown in FIG. 8, at least three external enzyme reaction tanks 4 are provided, and the fiber slurry is controlled by the valve 44 to simultaneously perform feeding, enzyme reaction and discharge in the external enzyme reaction tanks 4, that is, at the same time, only one reaction tank performs feeding, only one reaction tank performs discharge, and at least one reaction tank performs enzyme reaction. The valve 44 includes a first valve 441 and a second valve 442. The feed pipe of each reaction tank is provided with a first valve 441, and the discharge pipe of each reaction tank is provided with a second valve 442. Only one first valve 441 and one second valve 442 are opened at any time, and the opened first valve 441 and second valve 442 do not belong to the same reaction tank. In order to prevent the fiber slurry from settling in the reaction tank, an agitator is installed inside each reaction tank. A pump P may be provided in the return line 41 to facilitate smooth discharge of the fiber slurry from the reaction tank when the second valve 442 is opened.

[0087] EMBODIMENT 6 In the corn fiber processing system of embodiment 1 and embodiment 2 of the present application, the external enzyme reaction tank 4 can be a continuous reaction tank. As shown in FIG. 9, the external enzyme reaction tank 4 includes a plurality of reaction tanks, which are connected in series, and a first stirring device 45 is provided inside each reaction tank. The fiber slurry enters the reaction tank from the top end and flows out from the bottom end of each reaction tank. In order to improve the flow of the fiber slurry in the reaction tank, a pump P may be installed near the bottom end of each reaction tank to promote the flow of the fiber slurry in the reaction tank.

[0088] EMBODIMENT 7 In the corn fiber processing system of embodiment 1 and embodiment 2 of the present application, the external enzyme reaction tank 4 can be a continuous reaction tank. As shown in FIG. 10, the external enzyme reaction tank 4 includes a plurality of reaction tanks, which are connected in series, the fiber slurry enters from the bottom end of each reaction tank and flows out from the top end of each reaction tank, the fiber slurry is conveyed to the reaction tank by the fiber washing tank 21, and the fiber slurry is pushed to flow in the reaction tank by the action of the thrust from the subsequent fiber slurry. Compared with FIG. 9, the external enzyme reaction tank 4 does not have a stirring device, and the diameter of the external enzyme reaction tank 4 is not more than 1.2 meters. Such an external enzyme reaction tank 4 is also called a laminar flow column, which can further save costs. In order to improve the flow of the fiber slurry in the reaction tank, a pump P can be installed in the input pipe and / or return pipe 41 of the external enzyme reaction tank 4 to promote the flow of the fiber slurry in the reaction tank.

[0089] EMBODIMENT 8 Referring to FIG. 11, compared with the external enzyme reaction tank 4 in the embodiment 6 and the embodiment 7, the external enzyme reaction tank 4 in the embodiment 8 has only one. The external enzyme reaction tank 4 is in the shape of a horizontal enzyme reaction tank, which reduces the occupied space of the external enzyme reaction tank 4, and there are many compartments in the horizontal enzyme reaction tank. As shown in FIG. 11, the horizontal enzyme reaction tank has a plurality of horizontally arranged first compartments 46 and a second stirring device 47 corresponding to the first compartments 46, and the fiber slurry can continuously flow through the first compartments 46. The flow path of the fiber slurry in the first compartment 47 is generally sinusoidal, linear or S-shaped. In order to make the fiber slurry flow smoothly in the external enzyme reaction tank 4, a pump P can be provided in the inlet pipe and / or return pipe 41 of the external enzyme reaction tank 4 to promote the flow of the fiber slurry.

[0090] EMBODIMENT 9 In the corn fiber processing system of embodiment 1 and embodiment 2 of the present application, the external enzyme reaction tank 4 can be a vertical enzyme reaction tank. As shown in FIG. 12, the vertical enzyme reaction tank has a plurality of vertically arranged second compartments 48 and a third stirring device 49 corresponding to the second compartments 48, and the fiber slurry can flow continuously through the second compartments 48. The third stirring device has a plurality of vertically arranged stirring blades corresponding to the second compartments in a one-to-one manner, the second compartments are continuously communicated, and the stirring blades stir the fiber slurry in the corresponding second compartments. In order to make the fiber slurry flow smoothly in the external enzyme reaction tank 4, a pump P can be provided in the inlet pipe and / or return pipe 41 of the external enzyme reaction tank 4 to promote the flow of the fiber slurry.

[0091] EMBODIMENT 10 Referring to Figure 13, a corn fiber processing system for extracting corn starch may include a pressure curved sieve group 1', a fiber washing tank group 2'', an enzyme preparation dosing device 3', and an external enzyme reaction tank 4'. The pressure curved sieve group 1' is coincident with the fiber washing tank group 2''.

[0092] The pressure curved sieve group 1' has a multi-stage pressure curved sieve 11', which is used to separate a fiber slurry containing starch and protein into a sieve overflow (sieve overflow fiber) and a sieve underflow (sieve underflow washing water), and each stage of the pressure curved sieve 11' has a fiber slurry inlet 111', a sieve overflow outlet 112', and a sieve underflow outlet 113'. For ease of explanation, it is assumed that the pressure curved sieve group 1 has six stages of pressure curved sieves 11', including pressure curved sieve N-2 (the leftmost pressure curved sieve), pressure curved sieve N-1 (an intermediate stage pressure curved sieve), pressure curved sieve N (an intermediate stage pressure curved sieve), pressure curved sieve N+1 (an intermediate stage pressure curved sieve), pressure curved sieve N+2 (an intermediate stage pressure curved sieve), and pressure curved sieve N+3 (the rightmost pressure curved sieve).

[0093] In the embodiment of the present application, except for the leftmost pressure curve sieve and the rightmost pressure curve sieve, the remaining pressure curve sieves can be called intermediate-stage pressure curve sieves, or only the pressure curve sieve N is called the intermediate-stage pressure curve sieve. The sieve overflow mainly includes wet fiber, attached starch, and protein, etc., and the sieve underflow mainly includes sieve underflow washing water, starch, and protein, etc. The first stage of the sieve underflow (the sieve underflow output from the sieve underflow outlet 113' of the pressure curve sieve N-2) is crude starch milk, and the second stage of the sieve underflow (the sieve underflow output from the sieve underflow outlet 113' of the pressure curve sieve N-1) comes from the sieve underflow separated from the previous stage of the pressure curve sieve (pressure curve sieve N), and the starch milk concentration is gradually reduced. Preferably, the pressure curved sieve in the middle stage refers to any stage of the pressure curved sieve except the first stage of the pressure curved sieve and the last stage of the pressure curved sieve in the group of pressure curved sieves. More preferably, the pressure curved sieve in the middle stage refers to the pressure curved sieve in the middle position, i.e., if the number of pressure curved sieves is odd, it refers to the pressure curved sieve in the middle position, or if the number of pressure curved sieves is even, it refers to the first pressure curved sieve in the middle position. As shown in Figure 13, the pressure curved sieve in the middle stage refers to pressure curved sieve N.

[0094] Further, the corresponding first stage sieve flow of the pressure curve sieve 11' flows to the gluten separation system, and the corresponding second stage sieve flow of the pressure curve sieve 11' flows to the material feed buffer tank 22' of the corn fiber system.

[0095] In a particular embodiment of the present application, the pressure curved sieve 11' is used to separate the fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, the sieve overflow of the pressure curved sieve 11' flows through the sieve overflow outlet 112' to the corresponding stage of the fiber washing tank 21' of the fiber washing tank group 2', and the sieve underflow of the pressure curved sieve 11' flows through the sieve underflow outlet 113' to the fiber washing tank 21' before the corresponding stage of the fiber washing tank 21' of the fiber washing tank group 2'. For example, the fiber washing tank 21' connected to the sieve overflow outlet 112' of the pressure curved sieve 11' is not adjacent to the fiber washing tank 21' connected to the sieve underflow outlet 113' of the pressure curved sieve 11, and is preferably separated by one stage of the fiber washing tank 21'. In a preferred embodiment of the present application, the sieve flow of the pressure curved sieve 11' flows through the sieve flow outlet 113' into a small material compartment of a fiber washing tank 21' which is supplied with material by the pressure curved sieve in the fiber washing tank group 2', and overflows through the small material compartment into the previous fiber washing tank 21'.

[0096] In a preferred embodiment of the present application, the fiber washing tank 21' connected to the sieve overflow outlet 112' of the pressure curved sieve 11' is separated by one stage of the fiber washing tank 21' from the fiber washing tank 21' connected to the sieve underflow outlet 113 of the pressure curved sieve 11'. As shown in FIG. 13, the pressure curved sieve N-2 supplies the sieve overflow fiber (sieve overflow) to the fiber washing tank N-2, and the sieve underflow washing water is then supplied to the gluten separation system. The pressure curved sieve N-1 supplies the sieve overflow fiber to the fiber washing tank N-1, and the sieve underflow washing water is then supplied to the washing tank N-3 (i.e., material supply buffer tank) located in front. The pressure curved sieve N supplies the sieve overflow fiber to the fiber washing tank N, and the sieve underflow washing water is then supplied to the fiber washing tank N-2. The pressure curved sieve N+1 supplies the sieve overflow fiber to the fiber washing tank N+1 and then supplies the sieve underflow washing water to the fiber washing tank N-1. The pressure curved sieve N+2 supplies the sieve overflow fiber to the fiber washing tank N+2 and then supplies the sieve underflow washing water to the fiber washing tank N. The pressure curved sieve N+3 supplies the sieve overflow fiber to the fiber washing tank N+3 and then supplies the sieve underflow washing water to the fiber washing tank N+1. In a more preferred embodiment of the present application, the pressure curved sieve N-2 supplies the sieve overflow fiber to the fiber washing tank N-2 and then supplies the sieve underflow washing water to the gluten separation system. The pressure curved sieve N-1 supplies the sieve overflow fiber to the fiber washing tank N-1 and then supplies the sieve underflow washing water to the washing tank N-3 (i.e., the material supply buffer tank) located in front. The pressure curved sieve N supplies the sieve overflow fibres to the fibre washing tank N and supplies the sieve underflow washing water to the small material compartment of the fibre washing tank N-1, which overflows through the small material compartment of the fibre washing tank N-1 into the fibre washing tank N-2. The pressure curved sieve N+1 supplies the sieve overflow fibres to the fibre washing tank N+1 and then supplies the sieve underflow washing water to the small material compartment of the fibre washing tank N, which overflows through the small material compartment of the fibre washing tank N into the fibre washing tank N-1. The pressure curved sieve N+2 supplies the sieve overflow fibres to the fibre washing tank N+2 and then supplies the sieve underflow washing water to the small material compartment of the fibre washing tank N+1, which overflows through the small material compartment of the fibre washing tank N+1 into the fibre washing tank N.The pressure curved sieve N+3 supplies the sieve overflow fiber to the fiber washing tank N+3, supplies the sieve underflow washing water to the small material compartment of the fiber washing tank N+2, and the sieve underflow washing water overflows through the small material compartment of the fiber washing tank N+2 to the fiber washing tank N+1, which is not limited in this application.

[0097] The above is only one embodiment of the present application, and the pressure curved sieve group 1' and the fiber washing tank group 2' can also be adapted as follows: the pressure curved sieve N-2 supplies the sieve overflow fiber to the fiber washing tank N-2, and the sieve underflow washing water is then supplied to the gluten separation system; the pressure curved sieve N-1 supplies the sieve overflow fiber to the fiber washing tank N-1, and the sieve underflow washing water is then supplied to the gluten separation system; the pressure curved sieve N supplies the sieve overflow fiber to the fiber washing tank N, and the sieve underflow washing water is then supplied to the fiber washing tank N-3 located in front; the pressure curved sieve N+1 supplies the sieve overflow fiber to the fiber washing tank N+1, and the sieve underflow washing water is then supplied to the fiber washing tank N-2. The pressure curved sieve N+2 supplies the sieve overflow fiber to the fiber washing tank N+2, and the sieve underflow washing water is then supplied to the fiber washing tank N-1. The pressure curved sieve N+3 supplies the sieve overflow fiber to the fiber washing tank N+3, and the sieve underflow washing water is then supplied to the fiber washing tank N, but these are not limited thereto in the present application.

[0098] The fiber washing tank group 2' is used to provide a place for washing the fiber slurry with washing water, and the fiber washing tank group 2' has multiple stages of fiber washing tanks 21', and each stage of the fiber washing tank 21' has a sieve overflow supply port 211', a sieve underflow supply port 212' and a discharge port 213'. Similarly, for convenience of explanation, it is assumed that the fiber washing tank group 2' has six stages of fiber washing tanks 21', which include fiber washing tank N-2, fiber washing tank N-1, fiber washing tank N, fiber washing tank N+1, fiber washing tank N+2 and fiber washing tank N+3. Preferably, the intermediate stage fiber washing tank refers to any stage of the fiber washing tank other than the first stage of the fiber washing tank and the last stage of the fiber washing tank in the intermediate stage of the fiber washing tank group, that is, any remaining fiber washing tank other than the fiber washing tank N-2 and the fiber washing tank N+3. More preferably, the intermediate stage fiber washing tank refers to a fiber washing tank at an intermediate position. When the number of fiber cleaning tanks is odd, the intermediate stage fiber cleaning tank refers to the fiber cleaning tank at the intermediate position, and when the number of fiber cleaning tanks is even, the intermediate stage fiber cleaning tank refers to the first fiber cleaning tank at the intermediate position, for example, the intermediate stage fiber cleaning tank refers to fiber cleaning tank N.

[0099] In addition, for temporary storage of fiber slurry and better control of the fiber washing process, the front end of the fiber washing tank N-2 can further be provided with a forwardly disposed washing tank N-3. The forwardly disposed washing tank N-3 is also called material supply buffer tank 22', which receives the sieved flow of the corresponding second stage (i.e., pressure curved sieve N-1) of the pressure curved sieve 11' and the fiber material produced by the fine grinding system, and the sieved flow and the fiber material are thoroughly mixed in the material supply buffer tank 22 to form a fiber slurry. In order to realize the countercurrent washing of corn fiber, the pressure curved sieve group 1' and the fiber washing tank group 2' are arranged in coordination, the fiber slurry output from the discharge port 213' of the fiber washing tank 21' is conveyed to the next stage of the pressure curved sieve 11', the sieve overflow fiber output from the sieve overflow outlet 112 of the pressure curved sieve 11 is conveyed to the corresponding fiber washing tank 21', and the sieve underflow washing water output from the sieve underflow outlet 113 of the pressure curved sieve 11 is conveyed to the two upper stages of the fiber washing tank 21', thus realizing the movement of the fiber dry material from the lower stage of the fiber washing tank 21' to the upper stage of the fiber washing tank 21' and the movement of the sieve underflow washing water from the upper stage of the fiber washing tank 21' to the lower stage of the fiber washing tank 21', thereby realizing the countercurrent washing of corn fiber. For example, the fiber slurry output from the discharge port 213' of the fiber washing tank N+2 is transported to the pressure curved sieve N+3, the sieve overflow fiber output from the sieve overflow outlet 112 of the pressure curved sieve N+3 is transported to the fiber washing tank N+3, and the sieve underflow washing water output from the sieve underflow outlet 113 of the pressure curved sieve N+3 is transported to the fiber washing tank N+1.

[0100] The enzyme preparation adding device 3' is used to add the enzyme preparation to the corn fiber processing system. The enzyme preparation reacts with the fiber slurry, so that the fiber slurry separates more free starch, bound starch and corn protein. The enzyme preparation adding device 3' can be an enzyme preparation adding tube, and as shown in FIG. 13, the enzyme preparation adding tube 3' can be connected to the input tube of the external enzyme reaction tank 4'. In addition, the enzyme preparation adding tube 3' can also be connected to the sieve overflow outlet 112' of the intermediate stage pressure curved sieve 11'', and the enzyme preparation adding tube 3' can also be connected to the external enzyme reaction tank 4'. The enzyme preparation can be added manually through the enzyme preparation adding tube 3', and can also be added through the enzyme preparation adding tube 3' using a pump, but is not limited thereto in the present application.

[0101] The external enzyme reaction tank 4' is connected to the sieve overflow outlet 112' of the intermediate stage pressure curved sieve 11'', the external enzyme reaction tank 4' is used to receive the sieve overflow in the intermediate stage pressure curved sieve 11'' and provide a place for enzyme reaction, after a certain time, the sieve overflow in the external enzyme reaction tank 4' is returned to the fiber slurry inlet 111' of the next stage of the pressure curved sieve 11' behind the intermediate stage pressure curved sieve 11'' through the return pipe 41'. The external enzyme reaction tank 4' can be a tank combination composed of one tank or multiple tanks according to the requirements of the equipment space and the residence time of the fiber slurry. The specific shape of the external enzyme reaction tank 4' will be described in the following embodiment, which will not be repeated in this specification considering the length. Assuming that the fiber washing tank group 2' has six stages of fiber washing tanks 21' and the pressure curved sieve group 1' has six stages of pressure curved sieves 11', as shown in FIG. 13, the fiber washing tank of the middle stage is fiber washing tank N, the pressure curved sieve 11'' of the middle stage is pressure curved sieve N, and the next stage of the pressure curved sieve 11' behind the pressure curved sieve 11'' of the middle stage is pressure curved sieve N+1.

[0102] The pressure curved sieve group 1' is usually arranged at a very high position, and the sieve overflow of the pressure curved sieve 11'' of the intermediate stage automatically flows into the external enzyme reaction tank 4' by the action of its own gravity without the need for an external pump. In addition, in order to make the sieve overflow flow smoothly in the external enzyme reaction tank 4', a pump can be provided on the return pipe 41' of the external enzyme reaction tank 4', so that the sieve overflow or the diluted sieve overflow output from the external enzyme reaction tank 4' is returned to the fiber slurry inlet 111' of the next stage of the pressure curved sieve 11' to promote the flow of the fiber slurry. In addition, the sieve overflow output from the pressure curved sieve 11'' of the intermediate stage stays in the external enzyme reaction tank 4' for a certain time, so that the external enzyme reaction tank 4' extends the reaction time of the enzyme preparation, and further improves the yield of corn starch and / or corn protein.

[0103] EMBODIMENT 11 Referring to Figure 14, the fiber dry matter concentration of the sieve overflow fiber can affect the work of the enzyme preparation, and in order to achieve a better work of the enzyme preparation, the fiber dry matter concentration should be 4%-6% (non-fiber dry matter in the fiber slurry is washed away by the 75 micron sieve). Although a low fiber dry matter concentration can reduce the work of the enzyme preparation, the fiber dry matter concentration of the sieve overflow output from the intermediate stage pressure curved sieve 11'' is generally 7%-8%, and if the fiber dry matter concentration is too high, it is unfavorable to the flow of the sieve overflow in the external enzyme reaction tank 4', therefore, controlling the fiber dry matter concentration of the sieve overflow is beneficial to promote the flow of the sieve overflow in the external enzyme reaction tank 4'. According to the above description of embodiment 1, the external enzyme reaction tank 4' has a water inlet 42' for adjusting the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4', and washing water can be injected through the water inlet 42', so that the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4' is 4%-6%, and the sieve overflow diluted with washing water (i.e., the diluted sieve overflow) flows smoothly in the external enzyme reaction tank 4', and the enzyme preparation achieves better work.

[0104] In a preferred embodiment of the present application, the water inlet 42' is externally connected to a water inlet pipe 43' for adjusting the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4', and the water inlet pipe 43' is directly connected to washing water outside the corn fiber processing system, so as to dilute the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4' from 7%-8% to 4%-6%, so that the sieve overflow diluted by the washing water flows smoothly in the external enzyme reaction tank 4', and the enzyme preparation achieves better work.

[0105] More preferably, a first flow control device 5' is provided near the water inlet 42' to control the washing water injected into the external enzyme reaction tank 4' so as to dilute the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4' from 7%-8% to 4%-6%, so that the sieve overflow diluted with the washing water flows smoothly in the external enzyme reaction tank 4', and the enzyme preparation achieves better work. When the washing water is injected into the external enzyme reaction tank 4', the total amount of water in the corn fiber processing system changes, so that according to the amount of water injection received by the external enzyme reaction tank 4', the amount of washing water injected into the corn fiber processing system needs to be correspondingly reduced, i.e., according to the amount of water injection, the amount of washing water injected into the corn fiber processing system needs to be correspondingly reduced, so as to keep the total amount of water (total amount of washing water) in the corn fiber processing system unchanged.

[0106] 14 again, in a preferred embodiment of the present application, a second flow control device 6' is provided near the wash water inlet 7' of the corn fiber processing system, and is used to control the water inflow of the external wash water of the corn fiber processing system. Preferably, the amount of wash water injected into the external enzyme reaction tank 4' is equal to the amount of wash water injected from the wash water inlet 7', so as to keep the total amount of water in the corn fiber processing system unchanged, and keep the fiber dry matter concentration of the whole fiber slurry in the fiber washing tank 21' in the original corn fiber processing system unchanged.

[0107] In a specific embodiment of the present application, the first flow controller 5' and the second flow controller 6' can be a flow meter, a flow valve, an electromagnetic flow valve, etc. The first flow controller 5' and the second flow controller 6' can be manually operated by an operator so that the amount of washing water injected into the external enzyme reaction tank 4' is equal to the reduced amount of washing water injected into the washing water inlet 7'. Automatic control is also possible. For example, a processor is provided for both the first flow controller 5' and the second flow controller 6' and connected simultaneously. The processor obtains the amount of washing water injected into the external enzyme reaction tank 4' from the first flow controller 5', and controls the second flow controller 6' according to the amount of washing water injected into the external enzyme reaction tank 4' to reduce the amount of washing water injected through the washing water inlet 7'. The processor can be a digital signal processor (DSP), a single chip microcomputer, an application specific integrated circuit (ASIC), a customer programmable gateway (FPGA), a system on chip (SoC), etc., but the processor is selected from common existing data processing components and will not be repeated here.

[0108] EMBODIMENT 12 In the corn fiber processing system of embodiment 10 and embodiment 11 of the present application, the sieve overflow from the intermediate stage pressure curved sieve 11'' and the washing water from the water inlet 42' of the external enzyme reaction tank 4' merge in the external enzyme reaction tank 4' to form a diluted sieve overflow, which is evenly mixed to achieve a relatively stable fiber dry matter concentration. The first flow control device 5' can be controlled according to the fiber dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4', thereby controlling the amount of washing water injected into the external enzyme reaction tank 4' and adjusting the fiber dry matter concentration of the diluted sieve overflow, so that the fiber dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4' is maintained at 4%-6%, and the enzyme preparation is in a better reaction state.

[0109] Further, a processor is used, which is electrically connected to the first flow control device 5' and the second flow control device 6' simultaneously. The processor controls the opening degree of the first flow control device 5' according to the dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4', and controls the washing water injected into the external enzyme reaction tank 4', thereby realizing the intelligent control of the fiber dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4'. For example, when the fiber dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4' is lower than 4%-6%, the opening degree of the first flow control device 5' is increased, and when the fiber dry matter fiber concentration of the diluted sieve overflow in the external enzyme reaction tank 4' is higher than 4%-6% and the viscosity of the diluted sieve overflow is too high, the opening degree of the first flow control device 5' is decreased. The first flow control device 5' can use a pneumatic flow control valve or an electromagnetic flow meter. The pneumatic flow control valve can be, for example, a Siemens VVF43 pneumatic flow control valve, and the electromagnetic flow meter can be, for example, a Siemens SITRANS FM MAG1100 electromagnetic flow meter. Furthermore, the processor obtains the amount of washing water injected into the external enzyme reaction tank 4' from the first flow control device 5', and controls the second flow control device 6' according to the amount of washing water injected into the external enzyme reaction tank 4', and reduces the amount of washing water injected through the washing water inlet 7', so as to keep the total amount of water (total amount of washing water) of the corn fiber processing system unchanged. The second flow control device 6' can use a pneumatic flow control valve or an electromagnetic flow meter. The pneumatic flow control valve can be, for example, a Siemens VVF43 pneumatic flow control valve, and the electromagnetic flow meter can be, for example, a Siemens SITRANS FM MAG1100 electromagnetic flow meter.

[0110] EMBODIMENT 13 In the corn fiber processing system of embodiment 10 and embodiment 11 of the present application, only one external enzyme reaction tank 4' can be provided. As shown in Fig. 15, the external enzyme reaction tank 4' is in the form of a horizontal enzyme reaction tank, which reduces the occupied space of the external enzyme reaction tank 4', and there are many compartments in the horizontal enzyme reaction tank. As shown in Fig. 15, the horizontal enzyme reaction tank has a plurality of horizontally arranged first compartments 44' and a first agitator 45' corresponding to the first compartments 44', and the fiber slurry can flow continuously through the first compartments 44'.

[0111] Preferably, the horizontal enzyme reaction tank has a plurality of vertically and staggeredly arranged semi-closed separators 46', which are used to divide the horizontal enzyme reaction tank into a plurality of first compartments 44'. The flow path of the diluted sieve overflow in the plurality of first compartments 44' is generally sinusoidal or S-shaped, so that the diluted sieve overflow is thoroughly stirred, which improves the reaction efficiency of the enzyme preparation. In order to make the diluted sieve overflow flow smoothly in the horizontal enzyme reaction tank, a pump P can be installed in the return pipe 41' of the horizontal enzyme reaction tank to promote the flow of the diluted sieve overflow.

[0112] EMBODIMENT 14 In the corn fiber processing system of embodiment 10 and embodiment 11 of the present application, the external enzyme reaction tank 4' can be a continuous reaction tank. As shown in Figure 16, the external enzyme reaction tank 4' includes a plurality of reaction tanks, which are connected in series, and each reaction tank is provided with a second stirring device 47'. The diluted sieve overflow enters from the top end of each reaction tank and flows out from the bottom end of each reaction tank (also called top-flow reaction tank), and a pump P may be installed near the bottom end of each reaction tank to facilitate the continuous flow of the diluted sieve overflow in the reaction tank, so that the diluted sieve overflow can better flow in the reaction tank.

[0113] EMBODIMENT 15 In the corn fiber processing system of embodiment 10 and embodiment 11 of the present application, the external enzyme reaction tank 4' can be a continuous reaction tank. As shown in Figure 17, the external enzyme reaction tank 4' includes a plurality of reaction tanks arranged in series, the diluted sieve overflow enters from the bottom end of each reaction tank (also called bottom-inflow reaction tank) and flows out from the top end of each reaction tank, the diluted sieve overflow is conveyed to the reaction tank by the intermediate-stage pressure curved sieve 11'', and the diluted sieve overflow is pushed to flow continuously in the reaction tank under the action of thrust from the subsequent diluted sieve overflow. Compared with Figure 16, no stirring device is provided in the external enzyme reaction tank 4', and each reaction tank has a diameter of 1.2 meters or less, such an external enzyme reaction tank 4' is also called a laminar flow column, which further saves costs. A pump P can be provided in the return pipe 41' of the external enzyme reaction tank 4' so that the diluted sieve overflow in the external enzyme reaction tank 4' can finally smoothly return to the fiber slurry inlet 111' of the next stage of the pressure curved sieve 11 behind the intermediate stage pressure curved sieve 11'', and the provided pump P can simultaneously promote the continuous flow of the diluted sieve overflow in multiple reaction tanks connected in series.

[0114] EMBODIMENT 16 In the corn fiber processing system of embodiment 10 and embodiment 11 of the present application, the external enzyme reaction tank 4' can be a vertical enzyme reaction tank. As shown in FIG. 18, the vertical enzyme reaction tank has a plurality of vertically arranged second compartments 48' and a third stirring device 49' corresponding to the second compartments 48', and the fiber slurry can flow continuously through the second compartments 48'. The third stirring device 49' has a plurality of vertically arranged stirring blades corresponding to the second compartments in a one-to-one manner, the second compartments are continuously communicated, and the stirring blades stir the fiber slurry in the corresponding second compartments. A pump P can be provided in the return pipe 41' of the external enzyme reaction tank 4' so that the diluted sieve overflow in the external enzyme reaction tank 4' can finally smoothly return to the fiber slurry inlet 111' of the next stage of the pressure curved sieve 11' behind the pressure curved sieve 11'' of the intermediate stage.

[0115] In a preferred embodiment of the present application, the vertical enzyme reaction tank has multiple vertically arranged baffles 49B' with a hollow center. When the vertical enzyme reaction tank is cylindrical, the baffles 49B' are ring-shaped, and when the vertical enzyme reaction tank is prismatic, the baffles 49B' are concentric square-shaped. The baffles 49B' are used to divide the vertical enzyme reaction tank into multiple vertically distributed second compartments 48'. Due to the presence of the baffles 49B', the third stirring device 49' can thoroughly stir the diluted sieve overflow so as to improve the reaction efficiency of the enzyme preparation.

[0116] Furthermore, the capacity of the external enzyme reaction tank 4' and the flow rate of the fiber slurry are determined according to the daily corn processing capacity of the corn wet-milling starch processing system. For example, in the case of a corn wet-milling starch processing system having a daily processing capacity of 1,500 tons of corn, the capacity of the external enzyme reaction tank 4' is 300 m. 3 It is.

[0117] As shown in Figure 19, a specific embodiment of the present application further provides a corn wet milling starch processing system. The system includes a corn crushing system 100, a germ separation and washing system 200, a fine grinding system 300, a fiber processing system 400, a fiber dehydration and drying system 500, a gluten separation system 600, a protein separation and drying system 700, and a starch washing, dehydration and drying system 800. The fiber processing system 400 may include a pressure curved sieve group, a fiber washing tank group, an enzyme preparation addition device, an external enzyme reaction tank, etc. The enzyme preparation addition device, the external enzyme reaction tank, etc. may be the enzyme preparation addition device and the external enzyme reaction tank of the above embodiment. Considering the length, the matching method of the pressure curved sieve group and the fiber washing tank group, and the structure, function and connection position relationship of the enzyme preparation addition device and the external enzyme reaction tank will not be repeated.

[0118] Furthermore, the capacity of the external enzyme reaction tank 4 and the flow rate of the fiber slurry are determined by the daily corn processing capacity of the corn wet-milling starch processing system. For example, in the case of a corn wet-milling starch processing system having a daily processing capacity of 1,400 tons of corn, the capacity of the external enzyme reaction tank 4 is 290 m 3 Before the sieve flow cleaning water branch pipe 5 branches the sieve flow cleaning water, the total flow rate of the fiber slurry entering the external enzyme reaction tank 4 is 150 m 3 / h, and the total flow rate of the fiber slurry entering the external enzyme reaction tank 4 after the sieve flow cleaning water branch pipe 5 branches the sieve flow cleaning water is 105 m 3 / h.

[0119] Furthermore, the capacity of the external enzyme reaction tank 4' and the flow rate of the fiber slurry are determined by the daily corn processing capacity of the corn wet-milling starch processing system. For a corn wet-milling starch processing system with a daily processing capacity of 1500 tons of corn, the capacity of the external enzyme reaction tank 4' is 300 m 3 It is.

[0120] The above are only specific embodiments useful for illustrating the present application, and equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0121] 1. Pressure curved sieve group 2 Fiber cleaning tanks 3 Enzyme preparation addition device 4. External enzyme reaction tank 5. Sieve flow cleaning water branch pipe 6 External water storage buffer tank P-Pump 11 Pressure curved sieve 111 Fiber slurry inlet 112 Sieve overflow outlet 113 Sieve outlet 21 Textile cleaning tank 211 Sieve overflow supply port 212 Sieve flow supply port 213 Exhaust port 22 Material supply buffer tank 11' Intermediate stage pressure curved sieve 21' intermediate stage textile washing tank 41 Return pipe 42 Final discharge port 43 Initial material entrance 44 Valves 441 First Valve 442 Second Valve 45 First stirring device 46 First Section 47 Second mixing device 48 Second Section 49 Third Mixing Device 1' Pressure Curved Sieve Group 2' Fiber cleaning tank group 3' Enzyme preparation addition device 4' External enzyme reaction tank 5' First flow control device 6' Second flow control device 7' Wash water inlet 11' Pressure Curved Sieve 111' Fiber slurry inlet 112' Sieve overflow outlet 113' Sieve outlet 21' Textile Washing Tank 211' Sieve overflow supply port 212' Sieve flow supply port 213' Exhaust port 11'' Mid-position Pressure Curved Sieve 41' Return pipe 42' Water inlet 43' Water injection pipe 44' First Section 45' First Stirring Device 46' Semi-closed separator 46' First Section 47' Second Stirring Device 48' Second Section 49' Third agitator 49B' Baffle 100 Corn Crushing System 200 Germ Separation and Washing System 300 Fine Grinding System 400 Textile Processing System 500 Textile Dehydration and Drying System 600 Gluten Separation System 700 Protein Separation and Drying System 800 Starch Washing, Dehydrating and Drying System

Claims

1. A corn fiber processing system for extracting corn starch, comprising: a pressure curved sieve group (1), a fiber washing tank group (2), an enzyme preparation dosing device (3), and an external enzyme reaction tank (4); The pressure curved sieve group (1) has multiple stages of pressure curved sieves (11), which are used to separate a fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, each stage of the pressure curved sieves (11) having a fiber slurry inlet (111), a sieve overflow outlet (112), and a sieve underflow outlet (113); The fiber washing tank group (2) is used to provide a place for washing the fiber slurry with washing water, and the fiber washing tank group (2) has multiple stages of fiber washing tanks (21), each stage of the fiber washing tank (21) has a sieve overflow supply port (211), a sieve underflow supply port (212), and a discharge port (213); the enzyme preparation dosing device (3) is used to add an enzyme preparation to the corn fiber processing system; The external enzyme reaction tank (4) is connected to the discharge port (213) of the intermediate-stage fiber washing tank (21'), and the external enzyme reaction tank (4) is used to receive the fiber slurry in the intermediate-stage fiber washing tank (21') and provide a place for enzyme reaction, and the fiber slurry is returned to the fiber slurry inlet (111) of the next stage of the pressure curved sieve (11) behind the intermediate-stage pressure curved sieve (11') through the return pipe (41) after a predetermined time, and the sieve underflow contains sieve underflow washing water, and the sieve underflow washing water branch pipe (5) is connected to the fiber slurry inlet (111) of the next stage of the pressure curved sieve (11) behind the pressure curved sieve (11') of the intermediate stage. a second stage of the pressure curved sieve (11) behind the intermediate stage pressure curved sieve (11'), the sieve flow cleaning water branch pipe (5) is used to branch a part of the sieve flow cleaning water, thereby controlling the dry matter concentration in the external enzyme reaction tank (4), the residual sieve flow cleaning water is conveyed to the sieve flow supply port (212) of the intermediate stage fiber washing tank (21'), and the branched sieve flow cleaning water flows back to the corn fiber processing system by the sieve flow cleaning water branch pipe (5).

2. 2. The corn fiber processing system according to claim 1, characterized in that the enzyme preparation dosing device (3) is an enzyme preparation dosing tube.

3. 2. The corn fiber processing system according to claim 1, characterized in that the sieve overflow of the pressure curved sieve (11) flows to a corresponding stage of the fiber washing tank (21) in the fiber washing tank group (2), and the sieve underflow of the pressure curved sieve (11) flows to a non-adjacent fiber washing tank (21) before the corresponding stage of the fiber washing tank (21) in the fiber washing tank group (2).

4. 4. The corn fiber processing system according to claim 3, characterized in that the sieve overflow of the pressure curved sieve (11) flows to a corresponding stage of the fiber washing tank (21) in the fiber washing tank group (2), and the sieve underflow of the pressure curved sieve (11) flows to a fiber washing tank (21) one or two stages away from the corresponding stage of the fiber washing tank (21) in the fiber washing tank group (2).

5. 2. The corn fiber processing system according to claim 1, characterized in that the end of the sieve flow washing water branch pipe (5) is connected to the return pipe (41).

6. 2. The corn fiber processing system according to claim 1, characterized in that the end of the sieve flow washing water branch pipe (5) is provided at the top end of the final discharge port (42) of the external enzyme reaction tank (4).

7. 2. The corn fiber processing system according to claim 1, characterized in that the end of the sieve flow washing water branch pipe (5) is connected to the fiber slurry inlet (111) of the next stage of pressure curved screen (11) behind the pressure curved screen (11') of the intermediate stage.

8. 2. The corn fiber processing system of claim 1, wherein the beginning of the sieve flow cleaning water branch pipe (5) is provided in the pipe between the sieve flow outlet (113) and the sieve flow supply port (212).

9. 2. The corn fiber processing system according to claim 1, further comprising an external water storage buffer tank (6) provided in the sieve flow cleaning water branch pipe (5).

10. A corn fiber processing system for extracting corn starch, comprising a pressure curved sieve group (1'), a fiber washing tank group (2'), an enzyme preparation dosing device (3'), and an external enzyme reaction tank (4'); The pressure curved sieve group (1') has multiple stages of pressure curved sieves (11'), which are used to separate a fiber slurry containing starch and protein into a sieve overflow and a sieve underflow, each stage of the pressure curved sieves (11') having a fiber slurry inlet (111'), a sieve overflow outlet (112') and a sieve underflow outlet (113'); The fiber washing tank group (2') is used to provide a place for washing the fiber slurry with washing water, and the fiber washing tank group (2') has multiple stages of fiber washing tanks (21'), each stage of the fiber washing tank (21') has a sieve overflow supply port (211'), a sieve underflow supply port (212') and a discharge port (213'); the enzyme preparation adding device (3') is used to add an enzyme preparation to the corn fiber processing system; The corn fiber processing system is characterized in that the external enzyme reaction tank (4') is connected to the sieve overflow outlet (112') of the intermediate-stage pressure curved sieve (11''), the external enzyme reaction tank (4') is used to receive the sieve overflow in the intermediate-stage pressure curved sieve (11'') and provide a place for enzyme reaction, the sieve overflow is returned to the fiber slurry inlet (111') of the next stage of the pressure curved sieve (11') behind the intermediate-stage pressure curved sieve (11'') through a return pipe (41') after a predetermined time, and the external enzyme reaction tank (4') has a water inlet (42') for adjusting the fiber dry matter concentration in the external enzyme reaction tank (4').

11. 11. The corn fiber processing system according to claim 10, characterized in that the water inlet (42') is externally connected to a water inlet pipe (43') for adjusting the fiber dry matter concentration in the external enzyme reaction tank (4').

12. 11. The corn fiber processing system according to claim 10, further comprising a first flow control device (5') provided at the water inlet (42') and used to control the amount of water received by the external enzyme reaction tank (4).

13. 13. The corn fiber processing system of claim 12, further comprising a wash water injection adjustment device that correspondingly reduces the amount of wash water injected into the corn fiber processing system according to the amount of water injection so as to keep the total amount of water in the corn fiber processing system constant.

14. The corn fiber processing system of claim 10, further comprising a second flow control device (6') provided at a wash water inlet (7') of the corn fiber processing system and used to control the amount of water inflow of the external wash water of the corn fiber processing system.

15. The corn fiber processing system according to claim 10, characterized in that the enzyme preparation dosing device (3') is an enzyme preparation dosing tube.

16. A corn wet mill starch processing system, characterized in that it comprises a corn fiber processing system (400) according to any one of claims 1 to 15.

17. 17. The corn wet-grinding starch processing system according to claim 16, comprising a corn crushing system (100), a germ separation and washing system (200), a fine grinding system (300), a fiber processing system (400), a fiber dehydration and drying system (500), a gluten separation and drying system (600), a protein separation and drying system (700), and a starch washing, dehydration and drying system (800).

Images