CORN FIBER PROCESSING SYSTEM AND WET MILLING CORN STARCH PROCESSING SYSTEM USING THE SAME

Abstract

The embodiments of this application provide a corn fiber processing system and a wet-milled corn starch processing system that utilizes the same. The corn fiber processing system comprises a pressure-bent sieve assembly, a fiber washing sump assembly, an enzyme preparation addition device, and an external enzyme reaction tank. The external enzyme reaction tank is used to receive the sieve overflow from a middle stage of the pressure-bent sieve or fiber slurry from a middle stage of the fiber washing sump and provides a site for the enzyme reaction, thereby extending the reaction time of the enzyme participation. Furthermore, the reaction efficiency of the enzyme preparation can be further improved by controlling the fiber dry matter concentration in the external enzyme reaction tank.

Description

CORN FIBER PROCESSING SYSTEM AND WET MILLING CORN STARCH PROCESSING SYSTEM THAT USES HIMSELF FIELD OF INVENTION The present application relates to the technical field of deep maize processing, especially to a fiber processing device for extending the enzymatic reaction time during maize fiber washing and, in particular, to a maize fiber processing system and a wet milling maize starch processing system using the same. BACKGROUND OF THE INVENTION Corn starch is a product made from corn kernels through immersion in sulfurous acid, grinding and sieving, separation and washing, and dehydration and drying. Currently, a wet milling method (i.e., a wet corn starch production process) is generally used in the deep processing of corn starch. The goal of corn starch production is to extract as much pure starch and as many diverse byproducts (such as embryos, protein, fiber, and other soluble substances) from the corn kernels as possible. As shown in Fig. 1, the main ac&ann / i ζπζ / ε / uli Ref. 318246 Procedures for producing corn starch by means of the wet corn starch milling method include the stages of corn immersion, corn crushing and embryo separation and washing, fine milling, fiber washing and drying, gluten separation, protein separation and drying, washing, starch dehydration and drying, etc. A corn fiber washing system is required during the fiber washing process. This system consists primarily of multiple stages of pressure-bent sieves and multiple stages of fiber washing sumps that work in conjunction with the pressure-bent sieves. To allow a corn fiber suspension to release more free starch, bound starch, and corn protein during fiber washing, an enzyme preparation must be added to the fiber washing sumps. This allows the enzyme preparation to undergo an enzymatic reaction with the corn fiber suspension. However, because the corn fiber remains in the fiber washing sumps for only a short period, the reaction time is limited, resulting in insufficient activity and low enzymatic efficiency. SUMMARY OF THE INVENTION In view of the foregoing, the present application provides a corn fiber processing system and a wet milling corn starch processing system using the same. The corn fiber processing system comprises: a pressure-bent sieve group, a fiber washing sump group, an enzyme preparation addition device, and an external enzyme reaction tank, wherein the pressure-bent sieve group has multiple stages of pressure-bent sieves, the pressure-bent sieves are used to separate fiber suspension containing starch and protein into sieve overflow and sieve underflow, and each stage of the pressure-bent sieve has a fiber suspension inlet, a sieve overflow outlet, and a fiber underflow outlet;The fiber washing sump group is used to provide a place to wash the fiber slurry using wash water. The fiber washing sump group has multiple stages of fiber washing sumps, and each stage of the fiber washing sump has a sieve overflow feed hole, a sieve underflow feed hole, and a discharge hole. The enzyme preparation addition device is used to add the enzyme preparation to the corn fiber processing system.and the external enzyme reaction tank is connected to a discharge orifice of a middle stage of the fiber washing sump, the external enzyme reaction tank is used to receive the fiber suspension in the middle stage of the fiber washing sump and provide a place for the enzyme reaction, the fiber suspension is returned to the fiber suspension inlet of the next pressure curved sieve stage after the middle pressure curved sieve stage through a return duct after a predetermined time. Preferably, the enzyme preparation addition device is an enzyme preparation addition conduit. Preferably, the overflow from the pressure-bent sieve flows to the corresponding fiber washing sump stage between the fiber washing sump group, and the underflow from the pressure-bent sieve flows to the adjacent fiber washing sump before the corresponding fiber washing sump stage between the fiber washing sump group. Preferably, the overflow from the pressure-bent sieve flows to the corresponding fiber washing sump stage between the fiber washing sump group, and the underflow from the pressure-bent sieve flows to the fiber washing sump one or two stages away before the corresponding fiber washing sump stage between the fiber washing sump group. Preferably, the middle stage of the pressure-bent sieve QCRQnn / l 7P7 / B / YILI refers to any pressure-bent sieve stage other than the first pressure-bent sieve stage and the last pressure-bent sieve stage in the pressure-bent sieve group. More preferably, the middle pressure-bent sieve stage refers to the pressure-bent sieve in a middle position, i.e., with reference to the pressure-bent sieve in the middle position if there is an odd number of pressure-bent sieves, or with reference to the first pressure-bent sieve in the middle position if there is an even number of pressure-bent sieves. Preferably, the middle fiber wash sink stage refers to any fiber wash sink stage other than the first fiber wash sink stage and the last fiber wash sink stage among the middle stages of the fiber wash sink group. More preferably, the middle fiber wash sink stage refers to the fiber wash sink in a middle position, i.e., to the fiber wash sink in the middle position if there is an odd number of fiber wash sinks, or to the first fiber wash sink in the middle position if there is an even number of fiber wash sinks. Preferably, the corn fiber processing system also has a material feed compensation tank located before the washing sump group. QCRQnn / l 7Π7 / Β / ΥΙΛΙ fiber. Preferably, the sieve underflow from the corresponding first stage of pressure-bent sieve flows to a gluten separation system and the sieve underflow from the corresponding second stage of pressure-bent sieve flows to the material feed compensation tank of the corn fiber system. Preferably, the enzyme preparation addition device is an enzyme preparation addition conduit. Preferably, the sieve underflow contains sieve underflow wash water. A sieve underflow wash water divider is provided in a second stage of pressure-bent sieve after the middle stage of pressure-bent sieve. The sieve underflow wash water divider is used to divide part of the sieve underflow wash water to control the dry matter concentration in the external enzyme reaction tank. The remaining sieve underflow wash water is conveyed to the sieve underflow feed hole of the middle stage of the fiber washing sump, and the divided sieve underflow wash water flows back to the corn fiber processing system through the underflow wash water divider. QCRQnn / l 7Π7 / Β / ΥΙΛΙ tami z. Preferably, one end of the screen underflow wash water divider conduit is connected to the return conduit. Preferably, an end end of the sieve underflow wash water divider conduit is provided at an upper end of an end discharge hole of the external enzyme reaction tank. Preferably, one end of the screen underflow wash water divider conduit is connected to the fiber suspension inlet of a subsequent pressure-bent screen stage after the middle pressure-bent screen stage. Preferably, a starting end of the screen underflow wash water divider conduit is provided in the conduit between the screen underflow outlet and the screen underflow feed hole. Preferably, the corn fiber processing system further comprises: an external water storage compensation tank provided in the sieve underflow wash water divider conduit. Preferably, the corn fiber processing system further comprises: a dry matter concentration meter, which is provided at an initial material inlet of the external enzyme reaction tank and is used to measure the dry matter concentration of the fiber suspension in the external enzyme reaction tank. Preferably, the external enzyme reaction tanks are batch reaction tanks and there are at least three external enzyme reaction tanks, in which the fiber suspension is controlled by means of valves to simultaneously carry out feeding, enzyme reaction and discharge. Preferably, at any time, the fiber suspension is introduced into only one of the external enzymatic reaction tanks by means of a first valve and, at the same time, the fiber suspension is discharged from only one of the external enzymatic reaction tanks by means of a second valve. Preferably, each of the external enzyme reaction tanks is internally equipped with an agitation device. Preferably, the external enzyme reaction tanks are continuous reaction tanks and there are multiple external enzyme reaction tanks, which are connected in series, and each of which is internally provided with a first stirring device. Preferably, the external enzyme reaction tank is a horizontal enzyme reaction tank, which has multiple horizontally arranged first compartments and QCRQnn / ι znz / E / YiAi second stirring devices corresponding to the first compartments, flowing the fiber suspension sequentially through the first compartments. Preferably, the external enzyme reaction tank is a vertical enzyme reaction tank, which has multiple second compartments arranged vertically and third stirring devices corresponding to the second compartments, with the fiber suspension flowing sequentially through the second compartments. The present application further provides a corn fiber processing system and a wet-milled corn starch processing system that uses the same. The corn fiber processing system comprises: a pressure-bent sieve assembly, a fiber washing sump assembly, an enzyme preparation addition device, and an external enzyme reaction tank, wherein the pressure-bent sieve assembly has multiple stages of pressure-bent sieves, the pressure-bent sieves are used to separate starch- and protein-containing fiber suspension into sieve overflow and sieve underflow, and each stage of the pressure-bent sieve has a fiber suspension inlet, a sieve overflow outlet, and a fiber underflow outlet;The fiber washing sump group is used to provide a place to wash the fiber slurry by means of wash water; the fiber washing sump group has multiple stages of fiber washing sumps, and each stage of the fiber washing sump has a sieve overflow feed hole, a sieve underflow feed hole, and a discharge hole; the enzyme preparation addition device is used to add the enzyme preparation to the corn fiber processing system;and the external enzyme reaction tank is connected to a sieve overflow outlet of a middle stage of pressure-bent sieve; the external enzyme reaction tank is used to receive the sieve overflow at the middle stage of pressure-bent sieve and provide a place for the enzyme reaction; the sieve overflow is returned to the fiber suspension inlet of a subsequent stage of pressure-bent sieve after the middle stage of pressure-bent sieve through a return duct after a predetermined time. Preferably, the external enzyme reaction tank has an injection water inlet to adjust the fiber dry matter concentration in the external enzyme reaction tank. In addition, the injection water inlet is externally connected to an injection water conduit to adjust the concentration of dry fiber substance in the external enzymatic reaction tank. Preferably, the corn fiber processing system further comprises: a first flow control device provided at the injection water inlet and used to control the amount of injection water received by the external enzyme reaction tank. Additionally, the corn fiber processing system further comprises 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 injection water to maintain the total amount of water in the corn fiber processing system unchanged. Preferably, the corn fiber processing system further comprises: a second flow control device provided at a wash water inlet of the corn fiber processing system and used to control the amount of inlet water flow of the external wash water of the corn fiber processing system. In addition, the enzyme preparation addition device is an enzyme preparation addition conduit. Preferably, the external enzyme reaction tank is a horizontal enzyme reaction tank, which has multiple horizontally arranged first compartments and first stirring devices. QCAQnn / i ζηζ / E / γίΛΐ corresponding to the first compartments, the fiber suspension flowing sequentially through the first compartments. Preferably, the horizontal enzyme reaction tank has multiple semi-closed isolation plates arranged vertically and alternatively, which are used to divide the horizontal enzyme reaction tank into multiple first compartments. In addition, the external enzyme reaction tanks are multiple continuous reaction tanks, which are connected in series, and each of which is internally provided with a second stirring device. Preferably, the external enzyme reaction tank is a vertical enzyme reaction tank, which has multiple second compartments arranged vertically and third stirring devices corresponding to the second compartments, with the fiber suspension flowing sequentially through the second compartments. The present application further provides a wet milling corn starch processing system, comprising any corn fiber processing system of the above particular forms. Preferably, the wet milling corn starch processing system comprises a corn crushing system, an embryo separation and washing system, a fine milling system, a fiber processing system, a fiber dehydration and drying system, a gluten separation and drying system, a protein separation and drying system, and a starch washing, dehydration, and drying system. According to the above particular modalities of the present application, the corn fiber processing system and the wet milling corn starch processing system using the same have at least the following beneficial effects: by means of transporting the fiber suspension in the middle stage of the fiber washing sump to the external enzymatic reaction tank or by means of direct transport of the sieve overflow (sieve overflow fiber) from the middle stage of the pressure-bent sieve to the external enzymatic reaction tank, the time of a reaction in which the enzymatic preparation is involved is extended to allow the enzymatic preparation to fully participate in the reaction, improve the efficiency of the enzymatic reaction, increase the production of corn starch and / or corn protein and thereby increase economic benefits. It should be understood that the above general description and the following particular modalities are merely illustrative and explanatory and do not limit the scope claimed in this application. QCAQnn / i ζηζ / E / γίΛΐ BRIEF DESCRIPTION OF THE FIGURES The figures attached below form part of the description of this application and illustrate illustrative features of this application. The attached figures are used in conjunction with the description to explain the principles of this application. Fig. 1 is a flow diagram of corn starch production by wet milling and a process water cycle diagram in the prior art. Fig. 2 is a schematic structural diagram of a fiber processing system for extracting corn starch in a particular modality of the present application. Fig. 3 is a schematic structural diagram of a fiber processing system for extracting corn starch in a particular modality of the present application. Fig. 4 is a curve graph showing the relationship between the fiber dry matter concentration and the relative production of starch and protein in fiber provided in a particular modality of the present application. Fig. 5 is a structural schematic diagram of a connection of one end of a screen underflow wash water divider conduit with a return conduit provided in a particular modality of the present ocRonn / i znz / E / YiAi application. Fig. 6 is a structural schematic diagram of an arrangement of an end end of a screen underflow wash water divider conduit at an upper end of an end discharge orifice of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 7 is a schematic structural diagram of a fiber processing system for extracting corn starch in a particular modality of the present application. Fig. 8 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 9 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 10 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 11 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 12 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Figure 13 is a schematic structural diagram of a QCAQnn / l 7Π7 / Β / YILI fiber processing system for extracting corn starch in a particular modality of the present application. Fig. 14 is a schematic structural diagram of a fiber processing system for extracting corn starch in a particular modality of the present application. Fig. 15 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 16 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 17 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 18 is a schematic structural diagram of an external enzyme reaction tank provided in a particular modality of the present application. Fig. 19 is a structural schematic diagram of a wet milling corn starch processing system provided in a particular embodiment of the present application. Description of the reference numbers: curved sieve group 2 pressure sump fiber washing addition device 4 external ac&ann / i ζπζ / β / υιλι 5 Enzymatic reaction preparation 6 Screen underflow wash water divider 6 External water storage compensation tank P pump 11 Pressure curved screen 111 Fiber suspension inlet 112 Screen overflow outlet 113 Screen underflow outlet 21 Fiber wash sump 211 Screen overflow feed hole 212 Screen underflow feed hole 213 Discharge hole 22 Material feed compensation tank 11' Pressure curved screen middle stage 21' Fiber wash sump middle stage 41 Return conduit 42 Final discharge hole 43 Initial material inlet 44 Valve 441 First valve 442 Second valve 45 First device 46 First compartment agitation second agitation device third agitation device 1' pressure-bent sieve group 3' enzyme preparation addition device 5' first flow control device 'wash water inlet 111' fiber suspension inlet 113' screen underflow outlet 211' sieve overflow feed hole 213' discharge hole 41' return duct 43' injection water conduit ac&ann / i ζπζ / β / υιλι second compartment ' fiber washing sump group ' external enzyme reaction tank 6' second flow control device 11' pressure-bent sieve 112' sieve overflow outlet 21' fiber wash sump 212' screen underflow feed hole 11'' middle stage pressure curved sieve 42' injection water inlet 44' first compartment 45' first stirring device 46' semi-closed isolation plate 46' first compartment 47' second stirring device 48' 49B' second baffle compartment 49' third stirring device 100 corn crushing system 200 embryo separation and washing system 300 fine grinding system 400 fiber processing system 500 fiber dehydration and drying system 600 gluten separation system 700 protein separation and 800 drying system DETAILED DESCRIPTION OF starch washing, dehydration and drying system THE INVENTION To clarify the purpose, technical solutions and advantages of the modalities of the present application, the spirit of the content described in the present application will be clearly illustrated below with reference to the attached figures and the detailed description. Any expert in the relevant technical field, after understanding the modalities of the content of this application, could make changes and modifications with respect to the technique taught in the content of this application without departing from the spirit and QCRQnn / l 7Π7 / Β / YILI scope of the content of this application. The illustrative models in this application and their descriptions are used to explain the application, but are not intended to limit it. Furthermore, elements / members with the same or similar reference numbers used in the accompanying figures and models are used to represent the same or similar parts. The words first, second, ..., etc. used in this document do not specifically refer to the sequence or order, nor do they limit the present application, but are used only to distinguish the elements or operations described with the same technical terms. The directional terms used herein, such as up, down, left, right, front, or back, are solely directions with reference to the accompanying figures. Therefore, the directional terms used are intended to illustrate, but not limit, the present invention. The words that include, that comprise, that have, that contain, etc. used in this document are all open expressions, meaning including, but not limited to. The word and / or used in this document includes each and every combination of the things mentioned. The multiple word used herein includes ocAonn / i ζπζ / β / υιλι two and more than two, and the multiple group words used herein include two groups and more than two groups. The words "more or less," "approximately," etc., used in this document are used to modify any quantity or error that can be slightly changed without altering its essence. In general, the range of slight changes or errors modified by these words may be 20% in some modalities, 10% in some modalities, and 5% or other values ​​in some modalities. Subject matter experts would understand that the values ​​mentioned above may be adjusted according to actual needs and are not limited to them. In the fiber washing process, to release more free starch, bound starch, and corn protein from the corn fiber suspension, an enzyme preparation must be added to the fiber processing system. This enzyme preparation can reduce the hydrophilicity of cellulose and hemicellulose, lower the water content of the fibrous material, improve concentration and drying efficiency, reduce the amount of steam used for concentration and drying, and thus save energy. In the prior art, an enzyme reacts with the fiber suspension in a fiber washing sump. However, since the corn fiber remains in the fiber washing sumps for QCAQnn / i znz / E / YiAi a short period, the time of a reaction in which an enzyme participates is short, the reaction is insufficient and the efficiency of the enzymatic action is low. In a preferred embodiment of the present application, an external enzyme reaction tank is provided in a mid-stage fiber washing sump to receive and remain in the external enzyme reaction tank for a predetermined time (e.g., the contact reaction time distribution of the majority of the fiber suspension in the external enzyme reaction tank is 90 minutes to 240 minutes and the average contact reaction time is 150 minutes).Although the fiber suspension remains in the external enzyme reaction tank, the enzyme continues to react with the fiber suspension in the external enzyme reaction tank, and the fiber suspension is returned from the external enzyme reaction tank to a fiber suspension inlet of a subsequent pressure-bent sieve stage after the middle pressure-bent sieve stage after a predetermined time. This can effectively extend the reaction time in which the enzyme preparation participates, allow the enzyme preparation to fully participate in the reaction, minimize the hydrophilicity of cellulose and hemicellulose, improve starch production, enhance the reaction efficiency of the enzyme preparation, and reduce the wastewater generated in the production of wet milled corn starch. Furthermore, in an existing wet milling corn fiber water washing process, the sieve overflow fiber from the corresponding pressure curved sieve stage and the sieve underflow wash water from the last two pressure curved sieve stages can converge in the fiber washing sump, and the fiber dry substance concentration of the fiber suspension in the fiber washing sump cannot be freely adjusted. The fiber dry matter concentration can affect the performance of the enzyme preparation. In a preferred embodiment of the present application, to obtain optimum performance, the fiber dry matter concentration during the enzyme preparation reaction should be 4%-6% (with non-fiber dry matter removed from the fiber suspension by washing through a 75-micrometer sieve), because a lower fiber dry matter concentration will lead to lower enzyme performance, while a higher fiber dry matter concentration will lead to increased viscosity, which does not allow for continuous operation of the material in the system. In a preferred embodiment of the present application, a screen underflow wash water divider is provided in a second stage of pressure-bent screen, downstream of the middle stage of pressure-bent screen. The screen underflow wash water divider is used to divert a portion of the screen underflow wash water, for example, allowing some of the wash water to bypass the external enzyme reaction tank without mixing with the fiber slurry. The flow of diverted wash water is controlled by a valve to adjust the fiber dry matter concentration in the external enzyme reaction tank, thereby regulating the dry matter concentration of the fiber mixture and further enhancing the enzyme's action. In a preferred embodiment of the present application, taking an existing factory process as an example, the fiber dry matter content of the sieve overflow from the previous pressure-bent sieve stage is approximately 7%-8% and the flow rate is 40 m³ / h; the flow rate of the sieve underflow wash water from the subsequent pressure-bent sieve stage is 110 m³ / h; and, after mixing, the fiber dry matter concentration in the external enzyme reaction tank is approximately 2%, and, if the 70 m³ / h wash water is split to allow the 40 m³ / h wash water to enter the external enzyme reaction tank and mix with a fiber material, the fiber dry matter concentration in the external tank The enzymatic reaction QCRQnn / l 7Π7 / Β / YILI can be increased to 3.5%-4%, so that the enzyme preparation has a better reaction yield. In a preferred embodiment of the present application, the middle stage of pressure-bent sieve specifically refers to the pressure-bent sieve, in the pressure-bent sieve group, other than pressure-bent sieves on two sides, i.e., it refers to any pressure-bent sieve other than the pressure-bent sieve on the left end and the pressure-bent sieve on the right end.A sieve overflow outlet of the middle stage of the pressure-bent sieve is connected to the external enzyme reaction tank. The sieve overflow outlet of the middle stage of the pressure-bent sieve may not already be in communication with a sieve overflow feed hole of the corresponding fiber washing sump, or a valve may additionally be provided in a conduit between the sieve overflow outlet of the middle stage of the pressure-bent sieve and the sieve overflow feed hole of the corresponding fiber washing sump to use the valve to interrupt communication between the sieve overflow outlet of the middle stage of the pressure-bent sieve and the sieve overflow feed hole of the corresponding fiber washing sump. ac&ann / i ζπζ / β / υιλι In a preferred embodiment of the present application, the sieve overflow from the middle stage of a pressure-bent sieve can be transferred from a corn fiber processing system for enzymatic reaction. The sieve overflow can be returned to the fiber slurry inlet of the next pressure-bent sieve stage, downstream of the middle stage, via a return conduit after a predetermined time, and then returned to the corn fiber processing system. The reaction time in which the enzyme preparation participates can be extended to allow the enzyme preparation to react completely, thereby improving its efficiency. In a preferred embodiment of the present application, the sieve overflow outlet of the middle stage of the pressure-bent sieve can be connected to the external enzyme reaction tank, and the sieve overflow in the middle stage of the pressure-bent sieve can be transferred to an external enzyme reaction tank outside the corn fiber processing system for enzyme reaction, so that the relative production of starch and protein is high without considering the continuous operating yield of materials in the system. In the existing process of washing water from corn fiber ac&ann / i ζπζ / ε / υιλι of wet milling, the sieve overflow fiber (sieve overflow) from the corresponding pressure curved sieve stage and the sieve underflow wash water (sieve underflow) from the two pressure curved sieve stages after the same can converge in the fiber washing sump and the fiber dry substance concentration of the fiber suspension in the fiber washing sump cannot be freely adjusted.The fiber dry matter concentration can affect the performance of the enzyme preparation, because a lower fiber dry matter concentration will lead to a lower enzyme yield of the enzyme preparation, while a higher fiber dry matter concentration will lead to increased viscosity, which does not lead to continuous operation of the material (specifically sieve overflow or fiber overflow) in the system. In a preferred embodiment of the present application, to achieve optimum performance, the wash water can flow directly into the external enzymatic reaction tank and the fiber dry matter concentration during the enzymatic preparation reaction can be adjusted to 4%-6% (washing the non-fiber dry matter in the fiber suspension with a 75 micrometer sieve). In a preferred embodiment of the present application, taking the existing factory process as an example, the fiber dry matter content of the sieve overflow from the previous pressure-bent sieve stage is approximately 7%-8% and the flow rate is 40 m3 / h, and, if 30 m3 / h of wash water is introduced into the external enzyme reaction tank to dilute the sieve overflow in 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 a better reaction performance. The enzymatic reaction time can be calculated by dividing the effective volume of the external enzyme reaction tank by the total volume of the fiber slurry, including the total fiber slurry flow, the fiber flow (sieve overflow), and the wash water flow (sieve underflow). By subtracting a portion of the wash water flow, the total flow in the enzyme reaction tank is reduced, thus extending the enzymatic reaction time without changing the effective volume of the external enzyme reaction tank. Mode 1 With reference to Fig. 2, a corn fiber processing system for extracting corn starch may comprise: a pressure-bent sieve group 1, a fiber washing sump group 2, an enzymatic preparation addition device 3, and an external enzymatic reaction tank 4. The pressure-bent sieve group 1 coincides with the fiber washing sump group 2. The pressure-bent sieve group 1 has multiple stages of pressure-bent sieves 11. The pressure-bent sieves 11 are used to separate the fiber suspension containing starch and protein into sieve overflow and sieve underflow. Each stage of the pressure-bent sieve 11 has a fiber suspension inlet 111, a sieve overflow outlet 112, and a sieve underflow outlet 113.For ease of description, group 1 of pressure-bent sieves is assumed to have six stages of pressure-bent sieves, including a pressure-bent sieve N-2 (the first corresponding stage of pressure-bent sieves), a pressure-bent sieve N1 (the second corresponding stage of pressure-bent sieves), a pressure-bent sieve N (i.e., a middle stage of pressure-bent sieves), a pressure-bent sieve N+1 (i.e., a subsequent stage of pressure-bent sieves following the middle stage of pressure-bent sieves), a pressure-bent sieve N+2 (i.e., a second stage of pressure-bent sieves following the middle stage of pressure-bent sieves), and a pressure-bent sieve N+3 (i.e., a third stage of pressure-bent sieves following the middle stage of pressure-bent sieves). The sieve overflow consists mainly of wet fiber, bound starch, and protein, etc.The sieve underflow mainly comprises sieve underflow wash water, starch, protein, etc. The first stage of sieve underflow (the underflow outlet of the pressure-bent sieve N-2) is raw starch milk. The second stage of sieve underflow (the underflow outlet of the pressure-bent sieve N1) comes from underflow separated from the previous pressure-bent sieve stage (the pressure-bent sieve N), and the starch milk concentration decreases progressively. Preferably, the middle pressure-bent sieve stage refers to any pressure-bent sieve stage other than the first and last pressure-bent sieve stages in the pressure-bent sieve group.More preferably, the middle stage of a pressure-bent sieve refers to the pressure-bent sieve in a middle position, i.e., to the pressure-bent sieve in the middle position if there is an odd number of pressure-bent sieves, or to the first pressure-bent sieve in the middle position if there is an even number of pressure-bent sieves. As shown in Fig. 2, the middle stage of the sieve. QCAQnn / i ζηζ / E / γίΛΐ pressure curved refers to the pressure curved N sieve. In addition, the sieve underflow from the corresponding first stage of pressure-bent sieve 11 flows to a gluten separation system and the sieve underflow from the corresponding second stage of pressure-bent sieve 11 flows to a material feed compensation tank 22 of a corn fiber system. In a particular embodiment of the present application, the pressure-bent sieve 11 is used to separate the starch- and protein-containing fiber suspension into the sieve overflow and the sieve underflow. The sieve overflow from the pressure-bent sieve 11 flows to the corresponding fiber washing sump stage 21 between the fiber washing sump group 2 through the sieve overflow outlet 112. The sieve underflow from the pressure-bent sieve 11 flows to the fiber washing sump 21 before the corresponding fiber washing sump stage 21 between the fiber washing sump group 2 through the sieve underflow outlet 113. The fiber washing sump 21 connected to the sieve overflow outlet 112 of the pressure-bent sieve 11 is not adjacent to, and preferably at a distance of one or two fiber washing sump stages 21. fiber of,fiber washing sump 21 connected to the underflow outlet 113 of the pressure-bent sieve 11. ac&ann / i ζπζ / β / υιλι In a preferred embodiment of the present application, the underflow from the pressure-bent sieve 11 flows into a small material compartment of the fiber washing sump 21, to which the material is fed by the pressure-bent sieve between the fiber washing sump group 2 through the sieve underflow outlet 113, and overflows into the fiber washing sump 21 upstream through the small material compartment. In a preferred embodiment of the present application, the fiber washing sump 21 connected to the sieve overflow outlet 112 of the pressure-bent sieve 11 is at a distance of one or two stages from the fiber washing sump 21 connected to the sieve underflow outlet 113 of the pressure-bent sieve 11. As shown in Fig. 2, the fiber washing sump 21 connected to the sieve overflow outlet 112 of the pressure-bent sieve 11 is at a distance of one stage of fiber washing sump 21 from the fiber washing sump 21 connected to the sieve under-overflow outlet 113 of the pressure-bent sieve 11 and the pressure-bent sieve N-2 supplies the dry fiber substance from the sieve overflow to the fiber washing sump N-2 and supplies the sieve under-overflow wash water to the gluten separation system subsequently.Pressure-bent sieve N1 supplies the dry fiber substance from sieve overflow to fiber washing sump Nl and supplies the wash water from sieve underflow to a washing sump N-3 located at the front (i.e., the material feed compensation tank). Pressure-bent sieve N supplies the dry fiber substance from sieve overflow to fiber washing sump N and supplies the wash water from sieve underflow to fiber washing sump N-2. Pressure-bent sieve N+l supplies the dry fiber substance from sieve overflow to fiber washing sump N+l and supplies the wash water from sieve underflow to fiber washing sump Nl.The pressure-bent N+2 sieve supplies the dry fiber material from the sieve overflow to the N+2 fiber washing sump and subsequently supplies the underflow wash water to the N fiber washing sump. The pressure-bent N+3 sieve supplies the dry fiber material from the sieve overflow to the N+3 fiber washing sump and subsequently supplies the underflow wash water to the N+1 fiber washing sump. The above is only one modality of the present application and the pressure-bent sieve group 1 and the fiber washing sump group 2 can also be matched as follows: the fiber washing sump 21 connected to the sieve overflow outlet 112 of the pressure-bent sieve 11 is at a distance of two stages from the fiber washing sump 21 connected to the sieve under-overflow outlet 113 of the pressure-bent sieve 11 and the pressure-bent sieve N-2 supplies the dry fiber substance from the sieve overflow to the fiber washing sump N-2 and supplies the sieve under-overflow wash water to the gluten separation system subsequently.The pressure-bent sieve N1 supplies the dry fiber material from the sieve overflow to the fiber washing sump N1 and subsequently supplies the sieve under-overflow wash water to the gluten separation system. The pressure-bent sieve N supplies the dry fiber material from the sieve overflow to the fiber washing sump N and subsequently supplies the sieve under-overflow wash water to the front-mounted washing sump N-3. The pressure-bent sieve N+1 supplies the dry fiber material from the sieve overflow to the fiber washing sump N+1 and subsequently supplies the sieve under-overflow wash water to the fiber washing sump N-2. The pressure-bent sieve N+2 supplies the dry fiber material from the sieve overflow to the fiber washing sump N+2 and subsequently supplies the sieve under-overflow wash water to the fiber washing sump Nl.The pressure-bent N+3 sieve provides. QCAQnn / l 7Π7 / Β / YILI the dry fiber substance from sieve overflow to the fiber washing sump N+3 and supplies the sieve underflow wash water to the fiber washing sump N subsequently, which are not limited to the same in the present application. Fiber washing sump group 2 is used to provide a place to wash the fiber slurry using wash water. Fiber washing sump group 2 has multiple stages of fiber washing sumps 21, and each stage of fiber washing sump 21 has a sieve overflow feed hole 211, a sieve underflow feed hole 212, and a discharge hole 213. Similarly, for ease of description, fiber washing sump group 2 is assumed to have six stages of fiber washing sumps 21, including fiber washing sump N-2, fiber washing sump N1, fiber washing sump N (i.e., a middle stage of fiber washing sump), fiber washing sump N+1, fiber washing sump N+2, and fiber washing sump N+3.Preferably, the middle stage of a fiber washing sump refers to any fiber washing sump stage other than the first fiber washing sump stage and the last fiber washing sump stage within the middle stage of the fiber washing sump group. More preferably, the stage. QCAQnn / i ζηζ / E / γίΛΐ media of fiber wash sink refers to a fiber wash sink in a middle position. If there are odd numbers of fiber wash sinks, the median stage of fiber wash sink refers to the fiber wash sink in the middle position; and if there are even numbers of fiber wash sinks, the median stage of fiber wash sink refers to the first fiber wash sink in the middle position. Furthermore, for the temporary storage of the fiber slurry and improved control of the fiber washing process, the front end of the fiber washing sump N-2 can be additionally fitted with a front-mounted washing sump N-3. This front-mounted washing sump N-3 is also connected to the feed compensation tank 22 and receives the sieve underflow from the corresponding second stage of pressure-bent sieve 11 (i.e., pressure-bent sieve N1) and the fiber material produced by a fine milling system. The sieve underflow and fiber material are thoroughly mixed in the feed compensation tank 22 to form the fiber slurry. For countercurrent washing of corn fiber, the pressure-bent sieve group 1 and the fiber washing sump group 2 are arranged in a cooperative manner.The fiber suspension outlet from the discharge hole 213 of the fiber washing sump 21 is conveyed to the next stage of pressure-curved sieve 11. The dry fiber substance outlet from the overflow outlet 112 of the pressure-curved sieve 11 is conveyed to the corresponding fiber washing sump 21. The underflow wash water outlet from the underflow outlet 113 of the pressure-curved sieve 11 is conveyed to two upper stages of fiber washing sumps 21, thereby effecting the movement of the dry fiber substance from a lower stage of fiber washing sump 21 to an upper stage of fiber washing sump 21 and the movement of the underflow wash water from the upper stage of fiber washing sump 21 to the lower stage of fiber washing sump 21,thus performing countercurrent washing of corn fiber. For example, the fiber suspension outlet from the discharge hole 213 of the fiber washing sump N+2 is conveyed to the pressure-bent sieve N+3, the dry fiber substance outlet from the sieve overflow outlet 112 of the pressure-bent sieve N+3 is conveyed to the fiber washing sump N+3, and the wash water outlet from the sieve underflow outlet 113 of the pressure-bent sieve N+3 is conveyed to the fiber washing sump N+1. The enzyme preparation addition device 3 is used to add enzyme preparation to the ocAonn / i znz / B / v corn fiber processing system. The enzyme preparation reacts with the fiber suspension, causing the suspension to release more free starch, bound starch, and corn protein. The enzyme preparation addition device 3 can be connected to an inlet pipe of the external enzyme reaction tank 4, as shown in Fig. 2. Additionally, the enzyme preparation addition pipe 3 can also be connected to an inlet pipe of the fiber washing sump 21'.The enzyme preparation can also be added manually through the enzyme preparation addition channel 3 and can be added through the enzyme preparation addition channel 3 by means of a pump, which is not limited to the same in this application. The external enzyme reaction tank 4 is connected to the discharge port 213 of the fiber washing sump 21' middle stage. This tank receives the fiber slurry from the fiber washing sump 21' middle stage and provides a location for the enzymatic reaction. The fiber slurry in the external enzyme reaction tank 4 is returned to the fiber slurry inlet 111 from the subsequent pressure-bent sieve 11' middle stage via return conduit 41 after a predetermined time. Depending on equipment space requirements and fiber slurry retention time, the external enzyme reaction tank 4 can be a single tank or a combination tank consisting of multiple tanks.The specific form of the external enzymatic reaction tank 4 will be illustrated in the following embodiments, which will not be repeated in this document due to length. As shown in Fig. 2, it is assumed that the fiber washing sump group 2 has six stages of fiber washing sumps 21, the pressure-bent sieve group 1 has six stages of pressure-bent sieves 11, the middle stage of fiber washing sump 21' is fiber washing sump N, the middle stage of pressure-bent sieve 11' is pressure-bent sieve N, and the next pressure-bent sieve 11 stage after the middle stage of pressure-bent sieve 11' is pressure-bent sieve N+l. In addition, to allow the fiber suspension to flow smoothly in the external enzyme reaction tank 4, a pump can be provided at an initial material inlet 43 and / or the return conduit 41 of the external enzyme reaction tank 4 to promote the flow of the fiber suspension. Mode 2 Referring to Fig. 3, the fiber dry matter concentration in the fiber suspension can affect the performance of the enzyme preparation. To achieve optimal enzyme performance, the fiber dry matter concentration should be 4–6% (with non-fiber dry matter removed from the fiber suspension by washing using a 75-micrometer sieve). A lower fiber dry matter concentration can lead to reduced enzyme performance, while a higher concentration can increase the viscosity of the fiber suspension, hindering its continuous operation in a fiber processing system. Therefore, controlling the fiber dry matter concentration in the fiber suspension leads to further improvements in enzyme performance.According to the above description of modality 1, the fiber suspension in a mid-stage of the 21' fiber washing sump is conveyed directly to an external enzyme reaction tank, and the fiber dry matter concentration of the fiber suspension in the external enzyme reaction tank is approximately 2%. Although the reaction time of the enzyme preparation is extended, the fiber dry matter concentration of the fiber suspension in the external enzyme reaction tank remains constant. QCRQnn / l 7Π7 / Β / YILI is less than 4%, which may not achieve better performance of the enzyme preparation. In this modality, a second pressure-bent sieve stage 11, following a pressure-bent middle sieve stage 11', is provided with a sieve underflow wash water divider conduit 5. The sieve underflow wash water divider conduit 5 is used to divide part of the sieve underflow wash water to control the dry matter concentration (the fiber dry matter concentration) in the external enzyme reaction tank 4. The remaining sieve underflow wash water is conveyed to the fiber washing sump middle stage 21', and the divided sieve underflow wash water flows back to the corn fiber processing system through the sieve underflow wash water divider conduit 5.Since the fiber slurry in the middle stage of fiber washing sump 21' is conveyed to the external enzyme reaction tank 4, the underflow wash water originally conveyed to the external enzyme reaction tank 4 via the middle stage of fiber washing sump 21' is divided by the underflow wash water divider duct 5, so that the fiber slurry dry matter concentration in the external enzyme reaction tank 4 is 4%–6% and the enzyme preparation ocAonn / i ζπζ / β / υιλι is in a preferred reaction state. The division ratio of the underflow wash water is determined by the fiber overflow dry matter content and the flow rate of the previous pressure-bent sieve stage and the underflow wash water flow rate of the next pressure-bent sieve stage.In order not to change the dry matter concentration of the fiber suspension of the stages other than the middle stage in the original corn fiber processing system, the sieve underflow wash water divided by the sieve underflow wash water divider duct 5 converges with the fiber suspension in the reaction tank at an outlet of the external enzyme reaction tank, to finally return to the corn fiber processing system. Figure 4 is a curve graph showing the relationship between fiber dry matter concentration and the relative yield of starch and protein in fiber. It can be seen from Figure 4 that the relative yield of starch and protein in fiber is 80% or higher when the fiber dry matter concentration is 4–6%. The specific calculation method for the fiber dry matter concentration described above comprises: taking 200 g of fiber suspension from the external enzymatic reaction tank, washing the fiber suspension with water through a 75-micrometer sieve to remove... QCRQnn / l 7P7 / B / YILI washed the dry substance other than fiber, then dry the sieve overflow fiber in an oven at 105 °C to an absolute dry weight, weigh and divide the dry weight of absorptive by the total weight of 200 g to calculate the concentration of dry fiber substance. In addition, the sieve underflow wash water divider duct 5 may be provided in a sieve underflow wash water outlet duct of any pressure-bent sieve stage 11 downstream of the pressure-bent sieve 11', provided that the sieve underflow wash water discharged from a sieve underflow outlet 113 of the pressure-bent sieve stage 11 is conveyed to the middle fiber washing sump stage 21'.Preferably, the underflow wash water from the pressure-bent sieve 11 is conveyed to the corresponding fiber washing sump stage 21, the dry fiber substance from the overflow sieve of the pressure-bent sieve 11 is conveyed to the fiber washing sump 21 before the corresponding fiber washing sump stage 21, and the corresponding fiber washing sump stage 21 of the pressure-bent sieve 11 is at a distance of at least one fiber washing sump stage from the fiber washing sump 21 before the corresponding fiber washing sump stage 21 of the pressure-bent sieve 11.The sieve underflow washing water divider duct 5 is provided in the sieve underflow washing water outlet duct of the pressure-bent sieve 11 after the middle stage of the pressure-bent sieve 11'. The sieve underflow washing water from the pressure-bent sieve 11 is transported to the middle stage of the fiber washing sump 21', and the sieve underflow washing water divider duct 5 is used to divide part of the sieve underflow washing water to control the fiber dry matter concentration of the external enzyme reaction tank 4. The remaining sieve underflow wash water is conveyed to the mid-stage sump 21' fiber washing and the split sieve underflow wash water flows back into the corn fiber processing system through the sieve underflow wash water splitter conduit 5. More preferably, the underflow wash water from the pressure-bent sieve 11 is conveyed to the corresponding fiber washing sump stage 21, the dry overflow substance from the pressure-bent sieve 11 is conveyed to the fiber washing sump 21 before the corresponding fiber washing sump stage 21, and the corresponding fiber washing sump stage 21 of the pressure-bent sieve 11 is at a distance of one fiber washing sump stage 21 from the sump 21 of QCRQnn / l 7P7 / B / YILI fiber washing before the corresponding stage of sump 21 of fiber washing of pressure-bent sieve 11. The sieve underflow wash water divider duct 5 is provided in a sieve underflow wash water outlet duct of the second stage of pressure-bent sieve 11 after the middle stage of pressure-bent sieve 11', the sieve underflow wash water of pressure-bent sieve 11 is transported to the middle stage of fiber washing sump 21' and the sieve underflow wash water divider duct 5 is used to divide part of the sieve underflow wash water to control the dry substance concentration of the external enzyme reaction tank 4.The remaining sieve underflow wash water is conveyed to the mid-stage sump 21' fiber washing and the split sieve underflow wash water flows back into the corn fiber processing system through the sieve underflow wash water splitter conduit 5. A sieve underflow wash water divider duct 5 is mounted in a sieve underflow wash water transport duct from the second stage of the pressure-bent sieve 11 after the middle stage of the pressure-bent sieve 11', so that part of the wash water avoids the external enzyme reaction tank 4 without QCAQnn / l 7P7 / B / YILI mix with the fiber dry substance outlet from the sieve overflow of a 112 sieve overflow outlet of the middle stage of the 21' fiber washing sump and the divided washing water flow is controlled by a valve, to have the function of adjusting the fiber dry substance concentration of the external enzymatic reaction tank 4. The underflow wash water from the sieve, divided by the sieve underflow water divider (duct 5), can flow back into the corn fiber processing system at different locations. The underflow wash water from the pressure-bent sieve (duct 11) is divided by the initial end of the sieve underflow water divider (duct 5), and the final end of the sieve underflow water divider (duct 5) allows the divided underflow wash water to flow back into the corn fiber processing system.The end of the sieve underflow wash water divider duct 5 can be connected to the return duct 41 of the external enzyme reaction tank 4, the split sieve underflow wash water is conveyed to the return duct 41 and the split sieve underflow wash water flows back to the corn fiber processing system, as shown in Fig. 5. The end end of the water divider conduit 5 ac&ann / i ζπζ / β / υιλι of under-overflow wash can be arranged at an upper end of a final discharge orifice 42 of the external enzyme reaction tank 4 and the divided sieve under-overflow wash water is discharged from the external enzyme reaction tank 4 together with the fiber suspension in the external enzyme reaction tank 4 and then conveyed to the next pressure-bent sieve stage 11 after the middle pressure-bent sieve stage 11'.In the process of discharging the fiber slurry from the external enzyme reaction tank 4, the split screen underflow wash 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 split screen underflow wash water divider pipe 5 can also be connected to a fiber slurry inlet 111 of the next pressure-bent screen 11 stage after the middle pressure-bent screen 11' stage, so that the split screen underflow wash water is conveyed directly to the next pressure-bent screen 11 stage after the middle pressure-bent screen 11' stage, i.e., the split screen underflow wash water is conveyed directly to the fiber slurry inlet 111 of the pressure-bent screen N+l, as shown in Fig. 3. ac&ann / i ζπζ / β / υιλι Mode 3 As shown in Fig. 7, to effectively buffer the underflow wash water from the sieve divided by a sieve underflow water divider conduit 5, the sieve underflow wash water divider conduit 5 can be equipped with an external water storage compensation tank 6. The external water storage compensation tank 6 can temporarily store the underflow wash water divided by the sieve underflow wash water divider conduit 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 of underflow wash water from the subsequent pressure-bent sieve stage is relatively large.The underflow wash water from a pressure-bent sieve 11 is divided by the sieve underflow water divider duct 5, and the ratio of the underflow wash water is determined by the fiber dry substance content of the overflow sieve and the flow from the previous pressure-bent sieve stage and the underflow wash water flow from the next pressure-bent sieve stage. QCAQnn / i ζηζ / E / γίΛΐ Mode 4 In the corn fiber processing system of modality 1 and modality 2 of this application, the fiber dry matter from the overflow sieve of the previous stage of pressure-bent sieve 11 and the underflow sieve wash water from the subsequent stage of pressure-bent sieve 11 converge in an external enzyme reaction tank 4 and are uniformly mixed to achieve a relatively stable fiber dry matter concentration. According to this application, the proportion of the underflow sieve wash water divided by the underflow sieve wash water divider 5 can be adjusted according to the fiber dry matter concentration, so that the fiber suspension dry matter concentration in the external enzyme reaction tank 4 can be maintained at 4%-6%, and the enzyme preparation is in a preferred reaction state. Furthermore, the proportion of the screen underflow wash water divided by the screen underflow wash water divider duct 5 can be intelligently controlled by means of a flowmeter and a solenoid valve in the screen underflow wash water divider duct 5, i.e., the valve mounted in the screen underflow wash water divider duct 5 QCAQnn / i znz / E / YiAi sieve underflow washing is an electromagnetic valve, a controller is provided and electrically connected to the electromagnetic valve, and the degree of opening of the electromagnetic valve is controlled by the controller according to the concentration of dry substance of the fiber suspension in the external enzymatic reaction tank 4, thereby achieving intelligent control over the proportion of sieve underflow washing water divided by the sieve underflow washing water divider duct 5.For example, when the dry matter concentration of the fiber suspension in the external enzymatic reaction tank 4 is less than 4-6%, the opening degree of the solenoid valve increases; and when the dry matter concentration of the fiber suspension in the external enzymatic reaction tank 4 is greater than 4-6% and the viscosity of the fiber suspension is too high, the opening degree of the solenoid valve decreases. The solenoid valve is, for example, a pneumatic flow control valve, such as a Siemens WF43 pneumatic flow control valve, and the electromagnetic flow meter is, for example, a Siemens SITRANS FM MAG1100 electromagnetic flow meter. Mode 5 In the corn fiber processing system of modality 1 and modality 2 of this application, the external enzymatic reaction tanks can be batch reaction tanks. As shown in Fig. 8, at least three external enzymatic reaction tanks 4 are provided, and the fiber slurry is controlled by valves 44 to simultaneously carry out feeding, enzymatic reaction, and discharge into the external enzymatic reaction tank 4; that is, at any given time, only one reaction tank carries out discharge and at least one reaction tank carries out an enzymatic reaction. The valves 44 include first valves 441 and second valves 442. The feed line of each reaction tank is provided with a first valve 441, and the discharge line of each reaction tank is provided with a second valve 442.At any given time, only one valve, 441, and one valve, 442, are open, and the open valves for each reaction tank are not the same. To prevent the fiber suspension from settling in the reaction tank, each reaction tank is internally equipped with an agitator. When the second valve, 442, is open, a pump, P, may be installed in the return line 41 to facilitate the gentle discharge of the fiber suspension from the reaction tank. Modality 6 In the corn fiber processing system of Modality 1 and Modality 2 of this application, the external enzymatic reaction tanks can be continuous reaction tanks. As shown in Fig. 9, the external enzymatic reaction tanks comprise multiple reaction tanks connected in series, each internally equipped with a first stirring device 45. The fiber slurry enters from the top end of each reaction tank and flows out from the bottom end. To improve the flow of the fiber slurry within the reaction tank, a pump P is sometimes provided near the bottom of each reaction tank to promote the flow of the fiber slurry. Modality 7 In the corn fiber processing system of modality 1 and modality 2 of this application, the external enzymatic reaction tanks 4 can be continuous reaction tanks. As shown in Fig. 10, the external enzymatic reaction tanks 4 comprise multiple reaction tanks connected in series. The fiber slurry enters from the bottom of each reaction tank and flows out from the top. The fiber slurry is conveyed to the reaction tank by the fiber washing sump 21, and the fiber slurry is QCAQnn / l 7P7 / E / YILI propels the fiber suspension into the reaction tanks under the impulse of the downstream fiber suspension. In contrast to Fig. 9, no stirring device is provided in the external enzyme reaction tank 4, and the diameter of the enzyme reaction tank 4 does not exceed 1.2 meters. The external enzyme reaction tank 4 is also referred to as a laminar flow column, which can further reduce costs. To improve the flow of the fiber suspension in the reaction tank, the inlet and / or return conduit 41 of the external enzyme reaction tank 4 can be equipped with a pump P to promote the flow of the fiber suspension into the reaction tank. Mode 8 Referring to Fig. 11, compared to the external enzyme reaction tanks 4 in modes 6 and 7, only one external enzyme reaction tank 4 is provided in mode 8. This external enzyme reaction tank 4 is horizontal, which reduces its footprint, and it has multiple compartments. As shown in Fig. 11, the horizontal enzyme reaction tank has multiple horizontally arranged first compartments 46 and second stirring devices 47. QCAQnn / i znz / E / YiAi corresponding to the first compartments 46 and the fiber suspension can flow sequentially through the first compartments 46. The flow path of the fiber suspension in the first compartment 47 is sinusoidal, linear or S-shaped in its entirety. To allow the fiber suspension to flow smoothly in the external enzyme reaction tank 4, the inlet conduit and / or the return conduit 41 of the external enzyme reaction tank 4 can be provided with a pump P to promote the flow of the fiber suspension. Modality 9 In the corn fiber processing system of modality 1 and modality 2 of this application, the external enzyme reaction tank 4 may be a vertical enzyme reaction tank. As shown in Fig. 12, the vertical enzyme reaction tank has multiple vertically arranged second compartments 48 and corresponding third stirring devices 49, allowing the fiber suspension to flow sequentially through the second compartments 48. The third stirring device has multiple vertically arranged stirring blades that correspond to the second compartments one by one, with the second compartments communicating sequentially, and the stirring blade agitates the fiber suspension in the second compartment. QCAQnn / l 7P7 / B / YILI corresponding compartment. To allow the fiber suspension to flow smoothly in the external enzyme reaction tank 4, the inlet and / or return conduit 41 of the external enzyme reaction tank 4 may be provided with a pump P to promote the flow of the fiber suspension. Modality 10 With reference to Fig. 13, a corn fiber processing system for extracting corn starch may comprise: a pressure-bent sieve group 1', a fiber washing sump group 2', an enzyme preparation addition device 3', and an external enzyme reaction tank 4'. The pressure-bent sieve group 1' coincides with the fiber washing sump group 2'. The pressure-bent sieve group 1' has multiple stages of pressure-bent sieves 11'. These sieves are used to separate the starch- and protein-containing fiber suspension into sieve overflow (fiber from the sieve overflow) and sieve underflow (wash water from the sieve underflow). Each stage of the pressure-bent sieve 11' has a fiber suspension inlet 111', a sieve overflow outlet 112', and a sieve underflow outlet 113'. For ease of description, it is assumed that the pressure-bent sieve group 1' has six stages of pressure-bent sieves 11'. QCAQnn / i ζηζ / E / γίΛΐ by pressure, including a pressure-bent N-2 sieve (the left end of a pressure-bent sieve), a pressure-bent Nl sieve (a middle stage of a pressure-bent sieve), a pressure-bent N sieve (a middle stage of a pressure-bent sieve), a pressure-bent N+l sieve (a subsequent middle stage of a pressure-bent sieve), a pressure-bent N+2 sieve (a middle stage of a pressure-bent sieve), and a pressure-bent N+3 sieve (the right end of a pressure-bent sieve). In the modality of the present application, except for the left end of the pressure-bent sieve and the right end of the pressure-bent sieve, the remaining pressure-bent sieves may be referred to as the middle stage of pressure-bent sieves, or simply pressure-bent sieve N may be referred to as the middle stage of pressure-bent sieves. The sieve overflow mainly comprises wet fiber, bound starch, and protein, etc., and the sieve underflow mainly comprises sieve underflow wash water, starch, protein, etc.A first stage of sieve underflow (the underflow outlet of a pressure-bent sieve N-2) is raw starch milk. A second stage of sieve underflow (the underflow outlet of a pressure-bent sieve N) comes from separate sieve underflow from the previous pressure-bent sieve stage (the pressure-bent sieve N), and the starch milk concentration decreases progressively. Preferably, the middle pressure-bent sieve stage refers to any pressure-bent sieve stage other than the first and last pressure-bent sieve stages in the pressure-bent sieve group.More preferably, the middle stage of a pressure-bent sieve refers to the pressure-bent sieve in a middle position, that is, to the pressure-bent sieve in the middle position if there is an odd number of pressure-bent sieves, or to the first pressure-bent sieve in the middle position if there is an even number of pressure-bent sieves. As shown in Fig. 13, the middle stage of a pressure-bent sieve refers to the pressure-bent sieve N. In addition, the sieve underflow from the corresponding first stage of pressure-bent sieve 11' flows to a gluten separation system and the sieve underflow from the corresponding second stage of pressure-bent sieve 11' flows to a material feed compensation tank 22' of a corn fiber system. In a particular embodiment of the present application, the pressure-bent sieve 11' is used to separate the fiber suspension containing starch and protein in the sieve overflow and the sieve underflow, the sieve overflow of the pressure-bent sieve 11' flows to the corresponding fiber washing sump stage 21' between the fiber washing sump group 2' through the sieve overflow outlet 112' and the sieve underflow of the pressure-bent sieve 11' flows to the fiber washing sump 21' before the corresponding fiber washing sump stage 21' between the fiber washing sump group 2' through the sieve underflow outlet 113'.For example, the fiber washing sump 21' connected to the sieve overflow outlet 112' of the pressure-bent sieve 11' is not adjacent to, preferably a stage of fiber washing sump 21', the fiber washing sump 21' connected to the sieve underflow outlet 113' of the pressure-bent sieve 11. In a preferred embodiment of the present application, the sieve underflow from the pressure-bent sieve 11' flows into a small material compartment of the fiber washing sump 21', to which material is fed by the pressure-bent sieve between the fiber washing sump group 2' through the sieve underflow outlet 113', and overflows into the previous fiber washing sump 21' through the small material compartment. In a preferred embodiment of the present application, the fiber washing sump 21' connected to the sieve overflow outlet 112' of the pressure-bent sieve 11' is at a distance of one stage of fiber washing sump 21' from the fiber washing sump 21' connected to the sieve under-overflow outlet 113 of the pressure-bent sieve 11'. As shown in Fig. 13, the pressure-bent sieve N-2 supplies the sieve overflow fiber (the sieve overflow) to the fiber washing sump N-2 and supplies the sieve under-overflow wash water to the gluten separation system subsequently. The pressure-bent Nl sieve supplies the sieve overflow fiber to the Nl fiber washing sump and supplies the sieve underflow wash water to the N-3 washing sump located at the front (i.e., the material feed compensation tank) subsequently.The pressure-bent sieve N supplies the sieve overflow fiber to the fiber washing sump N and subsequently supplies the sieve underflow wash water to the fiber washing sump N-2. The pressure-bent sieve N+l supplies the sieve overflow fiber to the fiber washing sump N+l and subsequently supplies the sieve underflow wash water to the fiber washing sump N-l. The pressure-bent sieve N+2 supplies the sieve overflow fiber to the fiber washing sump N+2 and subsequently supplies the sieve underflow wash water to the fiber washing sump N. The pressure-bent sieve N+3. QCRQnn / l 7P7 / B / YILI supplies the sieve overflow fiber to the fiber washing sump N+3 and subsequently supplies the sieve underflow wash water to the fiber washing sump N+1. In a more preferred embodiment of the present application, the pressure-bent sieve N-2 supplies the sieve overflow fiber to the fiber washing sump N-2 and subsequently supplies the sieve underflow wash water to the gluten separation system. The pressure-bent sieve N1 supplies the sieve overflow fiber to the fiber washing sump N1 and subsequently supplies the sieve underflow wash water to the front-mounted washing sump N-3 (i.e., the material feed compensation tank).The pressure-bent sieve N supplies sieve overflow fiber to the fiber washing sump N and supplies sieve underflow wash water to the small material compartment of the fiber washing sump Nl, which overflows into the fiber washing sump N-2 via the small material compartment of the fiber washing sump N1. The pressure-bent sieve N+l supplies sieve overflow fiber to the fiber washing sump N+l and supplies sieve underflow wash water to the small material compartment of the fiber washing sump N, which overflows into the fiber washing sump Nl via the small material compartment of the fiber washing sump N. The pressure-bent sieve N+2. QCRQnn / l 7P7 / B / YILI by pressure supplies the sieve overflow fiber to the fiber washing sump N+2 and supplies the sieve underflow wash water to the small material compartment of the fiber washing sump N+1, which then overflows into the fiber washing sump N through the small material compartment of the fiber washing sump N+1. The pressure-bent sieve N+3 supplies the sieve overflow fiber to the fiber washing sump N+3 and supplies the sieve underflow wash water to the small material compartment of the fiber washing sump N+2, which overflows into the fiber washing sump N+1 through the small material compartment of the fiber washing sump N+2, which is not limited to the same in the present application. The above is only one embodiment of the present application, and the pressure-bent sieve group 1' and the fiber washing sump group 2' can also be configured as follows: The pressure-bent sieve N-2 supplies the sieve overflow fiber to the fiber washing sump N-2 and supplies the sieve underflow wash water to the gluten separation system downstream. The pressure-bent sieve Nl supplies the sieve overflow fiber to the fiber washing sump Nl and supplies the sieve underflow wash water to the gluten separation system downstream. The pressure-bent sieve N supplies the sieve overflow fiber to the fiber washing sump N and supplies the sieve underflow wash water to the front-mounted washing sump N-3 downstream.The pressure-bent sieve N+1 supplies the sieve overflow fiber to the fiber washing sump N+1 and subsequently supplies the sieve underflow wash water to the fiber washing sump N-2. The pressure-bent sieve N+2 supplies the sieve overflow fiber to the fiber washing sump N+2 and subsequently supplies the sieve underflow wash water to the fiber washing sump Nl. The pressure-bent sieve N+3 supplies the sieve overflow fiber to the fiber washing sump N+3 and subsequently supplies the sieve underflow wash water to the fiber washing sump N, which are not limited to these in the present application. The fiber washing sump group 2' is used to provide a place to wash the fiber slurry by means of wash water. The fiber washing sump group 2' has multiple stages of fiber washing sumps 21' and each stage of the fiber washing sump 21' has a sieve overflow feed hole 211', a sieve underflow feed hole 212' and a discharge hole 213'. Similarly, for ease of description, it is assumed that the fiber washing sink group 2' ac&ann / i ζπζ / β / υιλι has six stages of fiber washing sinks 21', including fiber washing sink N-2, fiber washing sink Nl, fiber washing sink N, fiber washing sink N+l, fiber washing sink N+2 and fiber washing sinks N+3.Preferably, the middle fiber wash sink stage refers to any fiber wash sink stage other than the first fiber wash sink stage and the last fiber wash sink stage between the middle stage of the fiber wash sink group, i.e., any remaining fiber wash sink other than fiber wash sink N-2 and fiber wash sink N+3. More preferably, the middle fiber wash sink stage refers to a fiber wash sink in a middle position.If there are odd-numbered fiber wash sinks, the middle fiber wash sink stage refers to the fiber wash sink in the middle position; and if there are even-numbered fiber wash sinks, the middle fiber wash sink stage refers to the first fiber wash sink in the middle position, for example, the middle fiber wash sink stage refers to fiber wash sink N. In addition, for the temporary storage of the fiber slurry and better control of the fiber washing process, the front end of the N-2 fiber washing sump can be QCRQnn / l 7P7 / B / YILI is further provided with a front-facing washing sump N-3. The front-facing washing sump N-3 is also referred to the material feed compensation tank 22' and receives the sieve underflow from the corresponding second stage of pressure-bent sieve 11 (i.e., pressure-bent sieve N1) and the fiber material produced by a fine grinding system. The sieve underflow and the fiber material are thoroughly mixed in the material feed compensation tank 22 to form the fiber slurry. To perform countercurrent washing of corn fiber, the pressure-bent sieve group 1' and the fiber washing sump group 2' are arranged cooperatively, the fiber suspension outlet from the discharge hole 213' of the fiber washing sump 21' is conveyed to the next stage of pressure-bent sieve 11',The fiber overflow from sieve overflow outlet 112 of pressure-bent sieve 11 is conveyed to the corresponding fiber washing sump 21'. The underflow wash water from sieve underflow outlet 113 of pressure-bent sieve 11 is conveyed to two upper stages of fiber washing sumps 21', thereby performing the movement of dry fiber substance from a lower stage of fiber washing sump 21' to an upper stage of fiber washing sump 21' and the movement of underflow wash water from the upper stage of fiber washing sump 21' to the lower stage of fiber washing sump 21', thereby performing countercurrent washing of corn fiber. For example,The fiber suspension outlet from the discharge hole 213' of the fiber washing sump N+2 is conveyed to the pressure-bent sieve N+3, the fiber overflow outlet from the overflow outlet 112 of the pressure-bent sieve N+3 is conveyed to the fiber washing sump N+3, and the wash water outlet from the underflow outlet 113 of the pressure-bent sieve N+3 is conveyed to the fiber washing sump N+1. The enzyme preparation addition device 3' is used to add enzyme preparation to the corn fiber processing system. The enzyme preparation reacts with the fiber suspension, causing the suspension to release more free starch, bound starch, and corn protein. The enzyme preparation addition device 3' can be an enzyme preparation addition conduit, and the enzyme preparation addition conduit 3' can be connected to an inlet conduit of the external enzyme reaction tank 4', as shown in Fig. 13. Furthermore, the enzyme preparation addition conduit 3' can also QCAQnn / l 7P7 / B / YILI is connected to the 112' overflow outlet of the 11'' pressure-bent middle stage sieve, and the enzyme preparation addition conduit 3' can also be connected to the external enzyme reaction tank 4'. The enzyme preparation can also be added manually through the enzyme preparation addition conduit 3' and can also be added through the enzyme preparation addition conduit 3' by means of a pump, which is not limited to the same in the present application. The external 4' enzyme reaction tank connects to the 112' overflow outlet of the 11" pressure-bent middle screen. This external 4' enzyme reaction tank receives the overflow from the 11" pressure-bent middle screen and provides a location for the enzyme reaction. The overflow in the external 4' enzyme reaction tank is returned to the 111' fiber slurry inlet of the next 11" pressure-bent middle screen via the 41' return line after a predetermined time. Depending on equipment space requirements and fiber slurry retention time, the external 4' enzyme reaction tank can be a single tank or a combination tank consisting of multiple tanks.The specific form of the external 4' enzymatic reaction tank will be illustrated in the following modalities, which will not be repeated herein. QCAQnn / i ζηζ / E / γίΛΐ document in view of the length. As shown in Fig. 13, the fiber washing sump group 2' is assumed to have six stages of 21' fiber washing sumps, the pressure curved sieve group 1' has six stages of 11' pressure curved sieves, the middle stage of the fiber washing sump is the fiber washing sump N, the middle stage of the 11'' pressure curved sieve is the pressure curved sieve N, and the next stage of the 11' pressure curved sieve after the middle stage of the 11'' pressure curved sieve is the pressure curved sieve N+l. The pressure-bent sieve group 1' is typically located at a very high position, and the sieve overflow from the middle stage of the 11" pressure-bent sieve flows automatically into the external enzyme reaction tank 4' under the action of its own gravity, without the need for an external pump. Furthermore, to allow the sieve overflow to flow smoothly into the external enzyme reaction tank 4', a pump can be provided in the return line 41' of the external enzyme reaction tank 4'. This ensures that the sieve overflow, or diluted sieve overflow outlet from the external enzyme reaction tank 4', is returned to the fiber slurry inlet 111' of the next pressure-bent sieve stage to promote the flow of the fiber slurry. Additionally, the sieve overflow outlet from the middle stage of the 11" sieve QCAQnn / i znz / E / YiAi pressure-bent will remain in the external 4' enzyme reaction tank for a period of time, so that the external 4' enzyme reaction tank extends the reaction time of the enzyme preparation to further enhance the production of corn starch and / or corn protein. Modality 11 With reference to Fig. 14, the fiber dry matter concentration of fiber overflow from the sieve can affect the performance of the enzyme preparation, and to achieve a better performance of the enzyme preparation, the fiber dry matter concentration should be 4%-6% (removing the non-fiber dry matter in the fiber suspension by washing with a 75 micrometer sieve).A lower fiber dry matter concentration can lead to a lower enzyme preparation yield, but the fiber dry matter concentration of the sieve overflow from the middle stage of the 11'' pressure-bent sieve is generally 7%-8%, and too high a fiber dry matter concentration does not lead to the flow of the sieve overflow into an external 4' enzyme reaction tank; therefore, controlling the fiber dry matter concentration of the sieve overflow leads to the promotion of the flow of the sieve overflow into the external 4' enzyme reaction tank.According to the above description of modality 1, the external 4' enzyme reaction tank has an injection water inlet 42' to adjust the fiber dry matter concentration of the sieve overflow in the external 4' enzyme reaction tank, and the wash water can be injected through the injection water inlet 42', so that the fiber dry matter concentration of the sieve overflow in the external 4' enzyme reaction tank is 4%-6%, the sieve overflow diluted by the wash water (i.e., the diluted sieve overflow) flows smoothly into the external 4' enzyme reaction tank, and the enzyme preparation achieves a better yield. In a preferred embodiment of the present application, the injection water inlet 42' is externally connected to an injection water conduit 43' to adjust the fiber dry matter concentration of the sieve overflow in the external enzyme reaction tank 4', and the injection water conduit 43' is directly connected to the wash water outside a corn fiber processing system 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 wash water flows smoothly into the external enzyme reaction tank 4' and the enzyme preparation achieves better performance. ac&ann / i znz / B / v More preferably, a first 5' flow control device is provided near the 42' injection water inlet to control the amount of wash water injected into the external 4' enzyme reaction tank to dilute the fiber dry matter concentration of the sieve overflow in the external 4' enzyme reaction tank from 7%-8% to 4%-6%, so that the sieve overflow diluted by the wash water flows smoothly into the external 4' enzyme reaction tank and the enzyme preparation achieves better performance.Since the injection of wash water into the external enzymatic reaction tank 4' will change the total amount of water in the corn fiber processing system, it is necessary to correspondingly reduce the amount of wash water injected into the corn fiber processing system according to the amount of injection water received by the external enzymatic reaction tank 4', that is, to correspondingly reduce the amount of wash water injected into the corn fiber processing system according to the amount of injection water, so that the total amount of water (the total amount of wash water) of the corn fiber processing system remains unchanged. Referring again to Fig. 14, in a preferred embodiment of the present application, the second flow control device 6' is provided near the inlet 7' of QCAQnn / l 7P7 / B / YILI is the wash water for the corn fiber processing system and is used to control the amount of water flow from the external wash water of the corn fiber processing system. Preferably, the amount of wash water injected into the external enzymatic reaction tank 4' is equal to the amount of wash water injected from the wash water inlet 7', to maintain unchanged the total amount of water in the corn fiber processing system and maintain unchanged the fiber dry matter concentration of the complete fiber suspension in the fiber wash sump 21' in an original corn fiber processing system. In a particular embodiment of the present application, the first flow control device 5' and the second flow control device 6' can be flowmeters, flow valves, electromagnetic flow valves, etc. The first flow control device 5' and the second flow control device 6' can be manually operated by a worker, such that the amount of wash water injected into the external enzymatic reaction tank 4' is equal to the reduced amount of wash water injected into the wash water inlet 7'. Automatic control can also be achieved. For example, a processor is provided and simultaneously connected to both the first flow control device 5' and the second flow control device 6'. 6' flow control. The processor obtains the amount of wash water injected into the external enzyme reaction tank 4' from the first flow control device 5', controls the second flow control device 6' according to the amount of wash water injected into the external enzyme reaction tank 4', and reduces the amount of wash water injected through the wash water inlet 7'. The processor may use a digital signal processor, a single-chip microcomputer, an application-specific integrated circuit (ASIC), a field-programmable logic array (FPGA), a system-on-a-chip, etc., which will not be repeated herein, because the processor is selected from common existing data processing components. Modality 12 In the corn fiber processing system of modality 10 and modality 11 of this application, the overflow from the pressure-bent middle stage sieve 11' and the wash water from the inlet 42' of the external enzyme reaction tank 4' converge in the external enzyme reaction tank 4' to form a diluted overflow, which is uniformly mixed to achieve a relatively stable fiber dry matter concentration. The first flow control device 5' can be controlled according to the substance concentration. QCAQnn / l 7P7 / B / YILI dry fiber from the diluted sieve overflow in the external enzyme reaction tank 4', to control the amount of washing water injected into the external enzyme reaction tank 4' to adjust the concentration of dry fiber from the diluted sieve overflow, so that the concentration of dry fiber from 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. Furthermore, a processor is used and is electrically connected simultaneously to the first flow control device 5' and the second flow control device 6'. The processor controls the degree of opening of the first flow control device 5' according to the concentration of dry substrate in the diluted sieve overflow in the external enzyme reaction tank 4' and controls the injection of wash water into the external enzyme reaction tank 4', thereby intelligently controlling the concentration of dry fiber substance in 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 less than 4%–6%, the opening degree of the first flow control device 5' is increased; and when the fiber dry matter concentration of the diluted sieve overflow in the external enzyme reaction tank 4' is greater 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 regulating valve or an electromagnetic flow meter. The pneumatic flow regulating valve could be, for example, a Siemens WF43 pneumatic flow regulating valve, and the electromagnetic flow meter could be, for example, a Siemens SITRANS FM MAG1100 electromagnetic flow meter.Furthermore, the processor obtains the amount of wash 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 wash water injected into the external enzyme reaction tank 4' to reduce the amount of wash water injected through the wash water inlet 7', thus maintaining the total amount of water (the total amount of wash water) in the corn fiber processing system unchanged. The second flow control device 6' can use either a pneumatic flow regulating valve or an electromagnetic flow meter. The pneumatic flow regulating valve could be, for example, a Siemens WF43 pneumatic flow regulating valve, and the electromagnetic flow meter could be, for example, a Siemens electromagnetic flow meter. QCAQnn / i ζηζ / E / γίΛΐ SITRANS FM MAG1100. Modality 13 In the corn fiber processing systems of modality 10 and modality 11 of this application, only one external enzyme reaction tank 4' may be provided. As shown in Fig. 15, the external enzyme reaction tank 4' is horizontal, which reduces its footprint, and it has multiple compartments. As shown in Fig. 15, the horizontal enzyme reaction tank has multiple horizontally arranged first compartments 44' and corresponding first stirring devices 45', allowing the fiber suspension to flow sequentially through the first compartments 44'. Preferably, the horizontal enzyme reaction tank has multiple semi-enclosed isolation plates 46' arranged vertically and alternatively, which are used to divide the horizontal enzyme reaction tank into multiple first compartments 44'. The flow path of the dilute sieve overflow in the multiple first compartments 44' is sinusoidal or S-shaped as a whole, so that the dilute sieve overflow can be thoroughly agitated to improve the reaction efficiency of the enzyme preparation. To allow the dilute sieve overflow to flow smoothly into the horizontal enzyme reaction tank, the return line 41' of the horizontal enzyme reaction tank can be provided with a pump P to promote the flow of the dilute sieve overflow. Modality 14 In the corn fiber processing system of modality 10 and modality 11 of this application, the external enzyme reaction tanks 4' may be continuous reaction tanks. As shown in Fig. 16, the external enzyme reaction tanks 4' comprise multiple reaction tanks, which are connected in series, and each of which is provided with a second stirring device 47'. The dilute sieve overflow enters from the top end of each reaction tank and flows out from the bottom end of each reaction tank (also called the top-inlet reaction tank). To allow the dilute sieve overflow to flow more effectively into the reaction tank, a pump P is sometimes provided near the bottom end of each reaction tank to promote the continuous flow of the dilute sieve overflow into the reaction tank. Modality 15 In the corn fiber processing system in modality 10 and modality 11 of this application, the external enzyme reaction tank 4' can be continuous reaction tanks. As shown in Fig. 17, the external enzyme reaction tanks 4' comprise multiple reaction tanks connected in series. The dilute sieve overflow enters from the lower end of each reaction tank (also called the lower inlet reaction tank) and flows out from the upper end. The dilute sieve overflow is conveyed by the pressure-bent sieve 11'' to the reaction tank, and the dilute sieve overflow is propelled to flow continuously within the reaction tank by the momentum of the subsequent dilute sieve overflow. Compared to Fig.16, no stirring device is provided in the external enzyme reaction tank 4', each reaction tank has a diameter not exceeding 1.2 meters, and the external enzyme reaction tank 4' is also referred to as a laminar flow column, thus further reducing costs. To allow the dilute sieve overflow in the external enzyme reaction tank 4' to flow smoothly back to the fiber suspension inlet 111' of the next pressure-bent sieve stage 11 after the middle pressure-bent sieve stage 11'', the return conduit 41' of the external enzyme reaction tank 4' can be fitted with a pump P, and the provided pump P can simultaneously promote the sequential flow of the dilute sieve overflow in the multiple reaction tanks connected in series. Modality 16 In the corn fiber processing system of modality 10 and modality 11 of this application, the external enzyme reaction tank 4' may be a vertical enzyme reaction tank. As shown in Fig. 18, the vertical enzyme reaction tank has multiple vertically arranged second compartments 48' and corresponding third stirring devices 49', and the fiber suspension can flow sequentially through the second compartments 48'. The third stirring device 49' has multiple vertically arranged stirring blades that correspond to the second compartments one by one, with the second compartments communicating sequentially, and the stirring blade agitates the fiber suspension in the corresponding second compartment.To allow the diluted sieve overflow in the external enzyme reaction tank 4' to finally flow smoothly back to the fiber suspension inlet 111' of the next pressure-bent sieve stage 11' following a middle pressure-bent sieve stage 11'', the return conduit 41' ocAonn / i ζπζ / β / υιλι of the external enzyme reaction tank 4' may be provided with a pump P. In a preferred embodiment of the present application, the vertical enzyme reaction tank has multiple vertically arranged baffles 49B' that are hollow in the middle. If the vertical enzyme reaction tank is cylindrical, the baffle 49B' is annular; and if the vertical enzyme reaction tank is in the form of a square column, the baffle 49B' is concentrically square. The baffles 49B' are used to divide the vertical enzyme reaction tank into multiple secondary compartments 48' arranged vertically. Due to the presence of the baffle 49B', the third stirring device 49' can thoroughly agitate the dilute sieve overflow to improve the enzyme preparation reaction efficiency. Furthermore, the volume of the external 4' enzymatic reaction tank and the fiber suspension flow are determined by the daily corn processing capacity of the wet milling corn starch processing system, for example, for the wet milling corn starch processing system with a daily processing capacity of 1500 tons of corn, the volume of the external 4' enzymatic reaction tank is 300 m3. As shown in Fig. 19, a particular modality QCRQnn / l 7P7 / B / YILI of this application further provides a wet milling corn starch processing system. The system comprises a corn crushing system 100, an embryo separation and washing system 200, a fine milling system 300, a fiber processing system 400, a fiber dewatering and drying system 500, a gluten separation system 600, a protein separation and drying system 700, and a starch washing, dewatering, and drying system 800. The fiber processing system 400 may include a pressure-bent sieve assembly, a fiber washing sump assembly, an enzyme preparation addition device, an external enzyme reaction tank, etc. It can be the enzyme preparation addition device and the external enzyme reaction tank in the above modalities.In view of the length, the matching mode between the pressure-bent sieve group and the fiber washing sump group, and the structures, functions and connection position relationship of the enzyme preparation addition device and the external enzyme reaction tank will not be repeated. In addition, the volume of the external enzymatic reaction tank 4 and the flow rate of the fiber suspension are determined by the daily corn processing capacity of the system. QCRQnn / l 7P7 / B / YILI wet milling corn starch processing, for example, for a wet milling corn starch processing system with a daily processing capacity of 1400 tons of corn, the volume of the external enzyme reaction tank 4 is 290 m3. Before the sieve underflow wash water divider duct 5 divides the sieve underflow wash water, the total flow of the fiber slurry entering the external enzyme reaction tank 4 is 150 m3 / h; and after the sieve underflow wash water divider duct 5 divides the sieve underflow wash water, the total flow of the fiber slurry entering the external enzyme reaction tank 4 is 105 m3 / h. Furthermore, the volume of the external 4' enzymatic reaction tank and the fiber suspension flow are determined by the daily corn processing capacity of the wet milling corn starch processing system, for example, for the wet milling corn starch processing system with a daily processing capacity of 1500 tons of corn, the volume of the external 4' enzymatic reaction tank is 300 m3. The foregoing are merely illustrative examples of the present application and any equivalent changes and modifications made by experts in the field QCRQnn / l 7Π7 / Β / YILI would fall within the scope of protection of this application, without departing from the concept and principle of this application. It is hereby stated that, as of this date, the best method known to the applicant for putting the aforementioned invention into practice is the one that is clear from the present description of the invention.

Claims

Having described the invention as above, the following claims are claimed as property:

1. A corn fiber processing system for extracting corn starch, characterized in that it comprises: a pressure-bent sieve group, a fiber washing sump group, an enzyme preparation addition device, and an external enzyme reaction tank, wherein the pressure-bent sieve group has multiple stages of pressure-bent sieves, the pressure-bent sieves are used to separate the fiber suspension containing starch and protein into sieve overflow and sieve underflow, each stage of the pressure-bent sieve having a fiber suspension inlet, a sieve overflow outlet, and a sieve underflow outlet;The fiber washing sump group is used to provide a place to wash the fiber slurry using wash water. The fiber washing sump group has multiple stages of fiber washing sumps. Each stage of the fiber washing sump has a sieve overflow feed hole, a sieve underflow feed hole, and an ac&ann / i znz / B / v discharge hole. The enzyme preparation addition device is used to add enzyme preparation in the corn fiber processing system.and the external enzyme reaction tank is connected to a discharge orifice of a middle stage of fiber washing sump, the external enzyme reaction tank is used to receive the fiber slurry in the middle stage of fiber washing sump and provide a place for enzyme reaction, the fiber slurry is returned to the fiber slurry inlet of a subsequent pressure curved screen stage after the middle stage of pressure curved screen through a return duct after a predetermined time.

2. The corn fiber processing system according to claim 1, characterized in that the enzyme preparation addition device is an enzyme preparation addition conduit.

3. The corn fiber processing system according to claim 1, characterized in that the sieve overflow from the pressure-bent sieve flows to the corresponding fiber washing sump stage between the fiber washing sump group and the sieve underflow from the pressure-bent sieve flows to the non-adjacent fiber washing sump before the corresponding QCAQnn / l 7Π7 / B / YILI fiber washing sump stage between the fiber washing sump group.

4. The corn fiber processing system according to claim 3, characterized in that the sieve overflow from the pressure-bent sieve flows to the corresponding fiber washing sump stage between the fiber washing sump group and the sieve underflow from the pressure-bent sieve flows to the fiber washing sump one or two stages away before the corresponding fiber washing sump stage between the fiber washing sump group.

5. The corn fiber processing system according to claim 1, characterized in that the sieve underflow contains sieve underflow wash water, a sieve underflow wash water divider conduit is provided in a second pressure-bent sieve stage after the middle pressure-bent sieve stage, the sieve underflow wash water divider conduit is used to divide part of the sieve underflow wash water, to control the dry substance concentration in the external enzymatic reaction tank,The remaining sieve underflow wash water is conveyed to the mid-stage sieve underflow feed hole of the fiber wash sump, and the split sieve underflow wash water flows back to the corn fiber processing system through the sieve underflow wash water divider conduit.

6. The corn fiber processing system according to claim 5, characterized in that an end end of the sieve underflow wash water divider conduit is connected to the return conduit.

7. The corn fiber processing system according to claim 5, characterized in that an end end of the sieve underflow wash water divider conduit is provided at an upper end of an end discharge hole of the external enzyme reaction tank.

8. The corn fiber processing system according to claim 5, characterized in that an end end of the sieve underflow wash water divider conduit is connected to the fiber suspension inlet of a subsequent pressure-bent sieve stage after the middle pressure-bent sieve stage.

9. The corn fiber processing system according to claim 5, characterized in that an initial end of the sieve underflow wash water divider conduit is provided in the conduit between QCAQnn / i znz / E / YiAi the sieve underflow outlet and the sieve underflow feed hole.

10. The corn fiber processing system according to claim 5, characterized in that it further comprises: an external water storage compensation tank provided in the sieve underflow washing water divider conduit.

11. A corn fiber processing system for extracting corn starch, characterized in that it comprises: a pressure-bent sieve group, a fiber washing sump group, an enzyme preparation addition device, and an external enzyme reaction tank, wherein the pressure-bent sieve group has multiple stages of pressure-bent sieves, the pressure-bent sieves are used to separate the fiber suspension containing starch and protein into sieve overflow and sieve underflow, each stage of the pressure-bent sieve having a fiber suspension inlet, a sieve overflow outlet, and a sieve underflow outlet;The fiber washing sump group is used to provide a place to wash the fiber slurry using wash water. The fiber washing sump group has multiple stages of fiber washing sumps. Each stage of the fiber washing sump has a QCAQnn / i ζηζ / E / γ sieve overflow feed hole, a sieve underflow feed hole, and a discharge hole. The enzyme preparation addition device is used to add enzyme preparation in the corn fiber processing system.and the external enzyme reaction tank is connected to a sieve overflow outlet of a middle stage of pressure-bent sieve; the external enzyme reaction tank is used to receive the sieve overflow at the middle stage of pressure-bent sieve and provide a place for enzyme reaction; the sieve overflow is returned to the fiber suspension inlet of a subsequent stage of pressure-bent sieve after the middle stage of pressure-bent sieve through a return duct after a predetermined time.

12. The corn fiber processing system according to claim 11, characterized in that the external enzymatic reaction tank has an injection water inlet to adjust the fiber dry matter concentration in the external enzymatic reaction tank.

13. The corn fiber processing system according to claim 12, characterized in that the injection water inlet is externally connected to the injection water conduit to adjust the concentration of dry fiber substance in the external enzymatic reaction tank.

14. The corn fiber processing system according to claim 12, characterized in that it further comprises: a first flow control device provided at the injection water inlet and used to control the amount of injection water received by the external enzymatic reaction tank.

15. The corn fiber processing system according to claim 14, characterized in that it further comprises a washing water injection adjustment device that correspondingly reduces the amount of washing water injected into the corn fiber processing system according to the amount of injection water to maintain the total amount of water in the corn fiber processing system unchanged.

16. The corn fiber processing system according to claim 12, characterized in that it further comprises: a second flow control device provided at a wash water inlet of the corn fiber processing system and used to control the inlet water flow rate of the external wash water of the corn fiber processing system.

17. The corn fiber processing system according to claim 11, characterized in that the enzyme preparation addition device is an enzyme preparation addition conduit.

18. A wet milling corn starch processing system, characterized in that it comprises a corn fiber processing system according to any of claims 1 to 17.

19. The wet milling corn starch processing system according to claim 18, characterized in that it comprises a corn crushing system, an embryo separation and washing system, a fine milling system, a fiber processing system, a fiber dehydration and drying system, a gluten separation and drying system, a protein separation and drying system, and a starch washing, dehydration, and drying system.

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