CN111330531A

CN111330531A - System for recovering nutrient components in rectifying tower bottoms in soybean polysaccharide production

Info

Publication number: CN111330531A
Application number: CN202010224943.8A
Authority: CN
Inventors: 丁明洁; 刘丽华; 宋成建; 李银峰; 王宁; 陈湘; 张增志; 郭易政; 李梦悦
Original assignee: Henan University of Urban Construction
Current assignee: Pingdingshan Jinjing Biological Technology Co ltd
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2020-06-26
Anticipated expiration: 2040-03-26
Also published as: CN111330531B; CN113398872A; CN113398872B

Abstract

A system for recovering nutrient components in a rectifying tower kettle in soybean polysaccharide production comprises a kettle liquid concentration tank, a Maillard reactor and a spray dryer, wherein the rectifying tower kettle firstly enters the kettle liquid concentration tank to form concentrated solution after concentration, the concentrated solution enters the Maillard reactor to carry out Maillard reaction after salt and pigment in the concentrated solution are removed by a first membrane separator, mixed solution after reaction is filtered by a second membrane separator and then enters the spray dryer to carry out spray drying, and finally a light brown powdery product is obtained. According to the invention, through the process flows of concentration of the kettle liquid, membrane separation and impurity removal, spray drying and the like, the nutritional ingredients in the bean dregs are finally concentrated into food-grade dry powder, so that the bean dregs can be directly used as an additive in food, the utilization of the nutritional ingredients in the kettle liquid is realized, the loss and waste of the nutritional ingredients are prevented, the waste is changed into valuable, the treatment cost of the kettle liquid is saved, and meanwhile, the additional economic benefit is realized.

Description

System for recovering nutrient components in rectifying tower bottoms in soybean polysaccharide production

Technical Field

The invention relates to the utilization of wastes in the field of soybean processing of soybean oil, polysaccharide and dietary fiber, in particular to a system for recovering nutrient components in a rectifying tower residue in the production of soybean polysaccharide.

Background

In the prior art, bean dregs are inevitably generated in the process of producing soybean oil, soybean protein, polysaccharide and dietary fiber by processing soybeans, and the bean dregs also contain rich soluble polysaccharide, dietary fiber and the like, so that the bean dregs are generally processed and utilized again in the prior art;

in the processing and utilization of the bean dregs, about 30 percent of the components of the bean dregs are converted into soluble polysaccharide, 30 percent of the components are converted into dietary fiber, and about 40 percent of the components are all put into alcohol-water waste liquid in the alcohol washing and refining process of products, and then after ethanol is recovered by a rectification system, 40 percent of the components of the bean dregs are transferred into kettle liquid of a rectification tower;

the kettle liquid must be treated, purified and cleared of organic matters before being discharged, and the organic matters reach the standard and are discharged, so that the production cost of enterprises is greatly increased. On the other hand, the main components of the kettle liquid are polysaccharides, peptides, dietary fibers and the like with medium and small molecular weights, are organic components with high nutritive value, have good food nutrition and health care functions, and waste of nutritional ingredients is caused by discharge after treatment.

Disclosure of Invention

In order to solve the problems of cost increase and nutrient component waste caused by direct discharge of the rectifying tower residue after the rectifying tower residue is treated in bean dreg processing in the prior art, the invention provides a system for recovering the nutrient component of the rectifying tower residue in soybean polysaccharide production.

The technical scheme adopted by the invention for solving the technical problems is as follows: a system for recovering nutrient components in a rectifying tower kettle in soybean polysaccharide production comprises a kettle liquid concentration tank, a Maillard reactor and a spray dryer, wherein the rectifying tower kettle firstly enters the kettle liquid concentration tank to form concentrated solution after concentration, the concentrated solution enters the Maillard reactor to carry out Maillard reaction after salt and pigment in the concentrated solution are removed by a first membrane separator, mixed solution after reaction is filtered by a second membrane separator and then enters the spray dryer to carry out spray drying, and finally a light brown powdery product is obtained.

As an optimized scheme of the system, the kettle liquid concentration tank comprises a closed concentration tank body with a detachable top cover at the upper part, a pneumatic valve is arranged on the top cover, a plurality of concentration pots with the same size are arranged in the concentration tank body, and gaps are reserved among the concentration pots;

each concentration pot comprises a pot body with an open top and an arc-shaped bottom, the side wall and the bottom wall of the pot body are of a hollow structure with a heating cavity, kettle liquid in the pot body is heated and concentrated by injecting steam into the heating cavity, the upper part of the heating cavity is provided with a communication hole, the communication hole is connected with an exhaust pipe arranged on the inner wall of the pot body, the bottom end of the exhaust pipe extends to the bottom in the pot body and is communicated with a steam discharge pipe surrounding the inner wall of the pot body, and the steam discharge pipe is provided with two rows of exhaust holes along the length direction of the steam discharge pipe, and the two rows of exhaust holes respectively incline to the upper part and; the top of the pot body is provided with a kettle liquid injection pipe for injecting kettle liquid into the pot body through a liquid discharge branch pipe and a concentrated liquid extraction pipe for extracting the concentrated liquid in the pot body through a liquid extraction branch pipe;

the concentrated jar of body diapire is the hollow structure who has the steam cushion chamber, and every the heating cavity of the internal of pot of concentrated pot all communicates with the steam cushion chamber through air intake branch pipe, and the steam cushion chamber then advances the pipe through steam and communicates with outside steam source.

As another optimized scheme of the system, the concentrating tank body is cylindrical, all the concentrating pots are arranged into a plurality of layers around the center of the concentrating tank body, the concentrating pot 4 of each layer is in a circle with the center of the concentrating tank body as the center of the circle, gaps are formed between adjacent concentrating pots, and gaps are also formed between adjacent concentrating pots; all concentrated pots in each layer all share cauldron liquid filling tube and concentrate extraction tube of same root, cauldron liquid filling tube and concentrate extraction tube are the ring pipe, cauldron liquid filling tube and concentrate extraction tube in each layer concentrated pot all with the cauldron liquid filling header pipe and the concentrate extraction header pipe intercommunication of concentrated tank body center department being equipped with, and cauldron liquid filling header pipe and concentrate extraction header pipe are in the internal one end of concentrated tank and seal, connect two liquid pumps respectively after the other end stretches out the concentrated tank body to realize the injection of cauldron liquid and the taking out of concentrate through these two liquid pumps.

As another optimization scheme of the system, electromagnetic valves are arranged on the liquid drainage branch pipe and the liquid extraction branch pipe in each pot body, the electromagnetic valves are switched on and off by a PLC (programmable logic controller) controller, a liquid level sensor for monitoring the height of the pot liquid in each pot body is arranged in each pot body, and the liquid level sensor marks three liquid level heights, namely a liquid level highest point H, a liquid level lowest point L and a liquid level middle point M, wherein the highest point H represents the maximum volume of the pot liquid contained in the pot body, the liquid level lowest point L represents the minimum volume of the pot liquid contained in the pot body, and the liquid level middle point M represents the liquid level height when the volume in the pot body is the maximum volume 1/3; the liquid level sensor transmits the monitored liquid level data to the PLC intelligent controller, so that the PLC intelligent controller controls the opening or closing of the electromagnetic valves on the liquid drainage branch pipe and the liquid pumping branch pipe according to the monitored liquid level height.

As another optimization scheme of the system, the bottom of each pot body is supported on the bottom wall of the concentrating tank body by at least three support legs, and a gap is formed between the bottom wall of the pot body and the bottom wall of the concentrating tank body.

As another optimization scheme of the system, the spray dryer comprises a cylindrical barrel, a hollow liquid spraying plate is arranged at the top of the barrel, kettle liquid to be spray-dried enters a cavity inside the liquid spraying plate through a kettle liquid inlet pipe and is uniformly sprayed into the barrel through a plurality of atomizing nozzles distributed at the bottom of the liquid spraying plate;

at least three groups of steam injection pipes are uniformly distributed on the inner wall of the cylinder along the height direction of the cylinder, each group of steam injection pipes is a hollow pipe arranged around the inner wall of the cylinder, a circle of spray holes are distributed on the side surface of the hollow pipe facing the center of the cylinder, and the spray holes are inclined upwards, so that drying steam introduced into the hollow pipe forms a conical upward steam curtain after being sprayed out by the spray holes, and meets and contrasts with mist kettle liquid sprayed out by an atomizing spray head for drying;

the bottom of the cylinder body is provided with a material receiving part with an inverted frustum shape, and the small diameter end of the material receiving part is arranged at the lower end to form a dry powder discharge hole.

As another optimization scheme of the system, the upper part of each group of the steam injection pipes is provided with an inclined annular baffle, the upper end of the annular baffle is tightly attached to the inner wall of the cylinder, and the bottom end of the annular baffle is tangent to the outer wall of the steam injection pipe, so that dry powder formed after drying is prevented from being accumulated on the steam injection pipes.

As another optimization scheme of the system, the liquid spraying plate is provided with a channel for communicating the cylinder with the outside, and an exhaust valve is arranged at an outer port of the channel so as to facilitate the discharge of steam in the cylinder.

As another optimized scheme of the system, a heating steam pipeline is arranged in the center of the cylinder, the heating steam pipeline is communicated with the steam jet pipe through a plurality of connecting pipes, and the top end of the heating steam pipeline penetrates through the liquid jet plate and is communicated with an external drying steam source;

the cross section of the heating steam pipeline is annular, dry steam flows in the annular cavity, a transmission shaft is arranged in the center of the annular cavity, the transmission shaft is rotatably connected with the inner wall of the heating steam pipeline through a plurality of groups of bearings, the top of the transmission shaft penetrates out of the heating steam pipeline and then is driven to rotate by a speed reducer driven by a motor, the bottom end of the transmission shaft drives a scraper plate located on the inner wall of the material receiving part to move along the inner wall of the material receiving part through a connecting rod, and therefore dry powder on the inner wall of the material receiving part is scraped to be discharged through a dry powder discharge port.

Compared with the prior art, the invention has the following beneficial effects:

1) according to the invention, through the process flows of concentration of the kettle liquid, membrane separation and impurity removal, spray drying and the like, the nutritional ingredients in the bean dregs are concentrated into food-grade dry powder, so that the bean dregs can be directly used as an additive in food, the utilization of the nutritional ingredients in the kettle liquid is realized, the loss and waste of the nutritional ingredients are prevented, the waste is changed into valuable, the treatment cost of the kettle liquid is saved, and the additional economic benefit is realized;

2) because the nutrient components in the kettle liquid are soluble polysaccharide and dietary fiber, when the kettle liquid is concentrated and dried by adopting a general heating mode, the soluble polysaccharide and the dietary fiber are easily damaged, scorched flavor is generated, and the quality of the product is influenced;

3) for the same reason, the main body of the spray dryer provided by the invention is a cylindrical barrel, the concentrated solution of the kettle liquid is sprayed into a fog shape from the top, hollow pipes surrounding the barrel are arranged at different heights in the barrel, and the hollow pipes are provided with spray holes which are inclined upwards, so that when steam is injected into the hollow pipes, the steam is sprayed out through the spray holes, an upward conical steam curtain is formed in the barrel and meets the kettle liquid for drying, the drying efficiency is improved, and simultaneously, the nutrient components in the steam cannot be burnt.

Drawings

FIG. 1 is a schematic overall flow diagram of the present invention;

FIG. 2 is a schematic structural view of a still liquid concentration tank;

FIG. 3 is a schematic diagram of a thickener;

FIG. 4 is a schematic diagram showing the arrangement of the concentrating pans in the kettle liquid concentrating tank;

FIG. 5 is a schematic diagram of a spray dryer;

FIG. 6 is a schematic view of the overall structure of the Maillard reactor (with the slide in the initial state);

FIG. 7 is a schematic view of the overall structure of the Maillard reactor (with the slide in the extreme position);

FIG. 8 is a schematic diagram of the arrangement of the Maillard reaction units in the steam heating vessel (taking 8 passes of 3 sets of Maillard reaction units as an example);

FIG. 9 is a schematic structural diagram of each group of Maillard reaction units (with the slide in an initial state);

FIG. 10 is a schematic view of the structure of each group of Maillard reaction units (when the slide is in the extreme state);

FIG. 11 is a schematic diagram of the construction of the transducer (with the slider in the initial state);

FIG. 12 is a schematic view of the construction of the transducer (with the slider in the extreme condition);

reference numerals: 1. a kettle liquid concentration tank 101, a concentration tank body 102, a pneumatic valve 103, a kettle liquid injection main pipe 104, a concentrated liquid extraction main pipe 105, a kettle liquid injection pipe 1051, a liquid discharge branch pipe 106, a concentrated liquid extraction pipe 1061, a liquid extraction branch pipe 107, a steam buffer cavity 108, a steam inlet pipe 109, a gas inlet branch pipe 2, a Maillard reactor 201, a steam inlet 202, a steam outlet 3, a spray dryer 301, a cylinder body 302, a steam injection pipe 303, a material receiving part 304, a dry powder discharge port 305, a liquid spray plate 306, a kettle liquid inlet pipe 307, a heating steam pipeline 308, a transmission shaft 309, a scraper plate 3010, a speed reducer 3011, a ring baffle 3012, an exhaust valve 4, a concentration kettle, a 401, a kettle body 402, a support leg 403, a heating cavity 404, an exhaust pipe 405, a steam discharge pipe 5, a reaction pipe 501, a guide plate 502, and a kettle liquid inlet pipe, 503. the device comprises a kettle liquid discharge pipe, 504, a first opening, 6, an expansion pipe, 601, a separation block, 602, a second opening, 603, a left steam branch pipe, 604, a right steam branch pipe, 605, a steam bag pipe, 7, an auxiliary material injection pipe, 701, a branch pipeline, 8, a hydraulic cavity, 801, a hydraulic connecting pipe, 9, a strip-shaped cavity, 901, a cavity, 902, a sliding block, 903, a connecting channel, 904, a connecting rod, 905 and a liquid passing hole area.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Example 1

As shown in fig. 1, a system for recovering nutrient components in a rectifying tower bottoms in soybean polysaccharide production comprises a bottoms concentration tank 1, a maillard reactor 2 and a spray dryer 3, wherein the rectifying tower bottoms are firstly put into the bottoms concentration tank 1 to form a concentrated solution after concentration, the concentrated solution is subjected to a maillard reaction in the maillard reactor 2 after salt and pigment in the concentrated solution are removed by a first membrane separator, and a mixed solution after the reaction is filtered by a second membrane separator and then is put into the spray dryer 3 to be subjected to spray drying, so that a light brown powdery product is finally obtained.

In the embodiment, the kettle liquid concentration tank 1, the Maillard reactor 2, the spray dryer 3 and the membrane separator can all adopt conventional products on the market; when the concentration is carried out in the kettle liquid concentration tank 1, the temperature is not more than 100 ℃, and the reaction temperature in the Maillard reactor 2 is not more than 80-120 ℃; the main function of the membrane separator is to filter out salts, pigments, off-flavors and the like.

Example 2

This embodiment is an improved scheme based on embodiment 1, and the main structure thereof is the same as embodiment 1, and the improvement point is that: as shown in fig. 2-4, the kettle liquid concentration tank 1 comprises a closed concentration tank body 101 with a detachable top cover at the upper part, a pneumatic valve 102 is arranged on the top cover, a plurality of concentration pots 4 with the same size are arranged in the concentration tank body 101, and gaps are arranged among the concentration pots 4;

each concentration pot 4 comprises a pot body 401 with an open top and an arc-shaped bottom, the side wall and the bottom wall of the pot body 401 are of a hollow structure with a heating cavity 403, kettle liquid in the pot body 401 is heated and concentrated by injecting steam into the heating cavity 403, the upper part of the heating cavity 403 is provided with a communication hole, the communication hole is connected with an exhaust pipe 404 arranged on the inner wall of the pot body 401, the bottom end of the exhaust pipe 404 extends to the bottom in the pot body 401 and is communicated with a steam discharge pipe 405 surrounding the inner wall of the pot body 1, and the steam discharge pipe 405 is provided with two rows of exhaust holes along the length direction thereof, and the two rows of exhaust holes respectively incline to the upper part and the lower part of; the top of the pan body 401 is provided with a kettle liquid injection pipe 105 for injecting kettle liquid into the pan body through a liquid discharge branch pipe 1051 and a concentrated liquid extraction pipe 106 for extracting the concentrated liquid in the pan body 401 through a liquid extraction branch pipe 1061, the bottom end of the liquid discharge branch pipe 1051 inclines towards the upper part of the side wall of the pan body 401, and the bottom end of the liquid extraction branch pipe 1061 extends to the bottom of the pan body 401;

the bottom wall of the concentrating tank body 101 is a hollow structure with a steam buffer cavity 107, a heating cavity 403 in a tank body 401 of each concentrating pan 4 is communicated with the steam buffer cavity 107 through an air inlet branch pipe 109, and the steam buffer cavity 107 is communicated with an external steam source through a steam inlet pipe 108.

Example 3

The present embodiment is an improved scheme based on embodiment 2, and the main structure of the present embodiment is the same as that of embodiment 2, and the improvement point is that: as shown in fig. 4, the concentrating tank 101 is cylindrical, all the concentrating pans 4 are arranged into a plurality of layers around the center of the concentrating tank 101, the concentrating pan 4 of each layer is circular with the center of the concentrating tank 101 as the center of circle, a gap is formed between adjacent concentrating pans 4, and a gap is also formed between adjacent concentrating pans 4; all concentration pots 4 in each layer all share the same kettle liquid injection pipe 105 and the same concentrated solution extraction pipe 106, the kettle liquid injection pipe 105 and the concentrated solution extraction pipe 106 are both annular pipes, the kettle liquid injection pipe 105 and the concentrated solution extraction pipe 106 of each layer of concentration pot 4 are both communicated with a kettle liquid injection main pipe 103 and a concentrated solution extraction main pipe 104 which are arranged in the center of the concentration tank body 101, one ends of the kettle liquid injection main pipe 103 and the concentrated solution extraction main pipe 104, which are located in the concentration tank body 101, are closed, and the other ends of the kettle liquid injection main pipe and the concentrated solution extraction main pipe extend out of the concentration tank body 101 and are respectively connected with two liquid pumps, so that the injection of kettle liquid and the extraction of concentrated solution are realized through the two.

Example 4

The present embodiment is another modified scheme based on embodiment 2, and the main structure of the present embodiment is the same as that of embodiment 2, and the improvement point is that: as shown in fig. 3, electromagnetic valves are respectively arranged on a liquid discharging branch pipe 1051 and a liquid pumping branch pipe 1061 in each pot body 401, and the electromagnetic valves are switched on and off by a PLC intelligent controller, a liquid level sensor for monitoring the height of the kettle liquid in each pot body 401 is arranged in each pot body 401, and the liquid level sensor marks three liquid level heights, namely a liquid level highest point H, a liquid level lowest point L and a liquid level middle point M, wherein the highest point H represents the maximum volume of the kettle liquid contained in the pot body 401, the liquid level lowest point L represents the minimum volume of the kettle liquid contained in the pot body 401, and the liquid level middle point M represents the liquid level height when the volume in the pot body 401 is the maximum volume 1/3; the liquid level sensor transmits the monitored liquid level data to the PLC intelligent controller, so that the PLC intelligent controller controls the opening or closing of the electromagnetic valves on the liquid drainage branch pipe 1051 and the liquid pumping branch pipe 1061 according to the monitored liquid level height.

When the liquid level sensor monitors that the liquid level is at the lowest point L, the liquid level sensor indicates that the kettle liquid in the pot body 401 is basically not available, and new kettle liquid needs to be injected, at the moment, the PLC intelligent controller controls the electromagnetic valve on the liquid extraction branch pipe 1061 to be closed, opens the electromagnetic valve on the liquid discharge branch pipe 1051, and injects the kettle liquid into the pot body 401; when the kettle liquid is monitored to be at the highest point H, the kettle liquid is fully filled in the kettle body 401, and at the moment, the PLC intelligent controller controls the electromagnetic valve on the liquid discharge branch pipe 1051 to be closed; in the process, as the kettle liquid is concentrated due to the heating of the steam, when the liquid level sensor monitors that the liquid level is at the middle point M, the concentration is finished at the moment, and at the moment, the PLC intelligent controller controls the electromagnetic valve on the liquid pumping branch pipe 1061 to be opened to pump out the concentrated liquid in the liquid pumping branch pipe; when the liquid level sensor monitors that the liquid level is at the lowest point L, the liquid level sensor indicates that the kettle liquid in the kettle body 401 is basically not available, new kettle liquid needs to be injected, and the process is repeated.

Example 5

The present embodiment is another modified scheme based on embodiment 2, and the main structure of the present embodiment is the same as that of embodiment 2, and the improvement point is that: as shown in fig. 2 and 3, the bottom of each pan 401 is supported on the bottom wall of thickening tank 101 by at least three legs 402, and a gap is formed between the bottom wall of pan 401 and the bottom wall of thickening tank 101.

Example 6

The present embodiment is another modified scheme based on embodiment 1, and the main structure of the present embodiment is the same as that of embodiment 1, and the improvement point is that: as shown in fig. 5, the spray dryer 3 includes a cylindrical barrel 301, a hollow spray plate 305 is disposed on the top of the barrel 301, the kettle solution to be spray dried enters a cavity inside the spray plate 305 through a kettle solution inlet pipe 306, and is uniformly sprayed into the barrel 301 through a plurality of spray nozzles distributed on the bottom of the spray plate 305;

at least three groups of steam injection pipes 302 are uniformly distributed on the inner wall of the cylinder body 301 along the height direction of the cylinder body, each group of steam injection pipes 302 is a hollow pipe arranged around the inner wall of the cylinder body 301, a circle of spray holes are distributed on the side surface of the hollow pipe facing the center of the cylinder body 1, and the spray holes are inclined upwards, so that drying steam introduced into the hollow pipe forms a conical upward steam curtain after being sprayed out by the spray holes, and meets and contrasts with mist-shaped kettle liquid sprayed by an atomizing spray head for drying;

the bottom of the cylinder 301 is provided with a receiving part 303 with an inverted truncated cone shape, and the small diameter end of the receiving part 303 is arranged at the lower end and forms a dry powder outlet 304.

Example 7

This embodiment is an improved scheme based on embodiment 6, and the main structure thereof is the same as that of embodiment 6, and the improvement point is that: as shown in fig. 5, an inclined ring-shaped baffle 3011 is disposed at the upper part of each group of the steam injection pipes 302, the upper end of the ring-shaped baffle 3011 is tightly attached to the inner wall of the cylinder 301, and the bottom end is tangent to the outer wall of the steam injection pipe 302, so as to prevent dry powder formed after drying from accumulating on the steam injection pipe 302.

Example 8

This embodiment is another modified scheme based on embodiment 6, and the main structure thereof is the same as embodiment 6, and the improvement point is that: as shown in fig. 5, the liquid-spraying plate 305 has a channel for communicating the cylinder 301 with the outside, and an exhaust valve 3012 is disposed at an outer port of the channel to facilitate the exhaust of the steam in the cylinder 301.

Example 9

This embodiment is another modified scheme based on embodiment 6, and the main structure thereof is the same as embodiment 6, and the improvement point is that: as shown in fig. 5, a heating steam pipeline 307 is arranged in the center of the cylinder 301, the heating steam pipeline 307 is communicated with the steam injection pipe 302 through a plurality of connecting pipes, and the top end of the heating steam pipeline passes through the liquid injection plate 305 and is communicated with an external drying steam source;

the cross section of the heating steam pipeline 307 is annular, dry steam flows in an annular cavity, a transmission shaft 308 is arranged in the center of the annular, the transmission shaft 308 is rotatably connected with the inner wall of the heating steam pipeline 307 through a plurality of groups of bearings, the top of the transmission shaft 308 penetrates through the heating steam pipeline 307 and is driven to rotate by a speed reducer 3010 driven by a motor, the bottom end of the transmission shaft 308 drives a scraper 309 on the inner wall of the material receiving part 303 to move along the inner wall of the material receiving part 303 through a connecting rod, and therefore dry powder on the inner wall of the material receiving part 303 is scraped off and is discharged through a dry powder discharge hole 304. The scraper 309 is flush with the height of the material receiving portion 303 in the height direction, and is disposed on the inner wall of the material receiving portion 303 in an inclined manner, that is, the length direction thereof is inclined to the direction of the generatrix of the material receiving portion 303.

Example 10

The Maillard reactor 2 used in the invention can be an existing Maillard reactor or a new steam-heated Maillard reactor, as shown in figures 6-8, the Maillard reactor comprises a closed cylindrical steam heating container with a steam inlet 201 and a steam outlet 202 symmetrically arranged on the side wall, a plurality of groups of Maillard reaction units are distributed in the steam heating container along the axial direction, each group of Maillard reaction units comprises a reaction pipe 5 which penetrates through the steam heating container in the axial direction, a gap is arranged between the adjacent reaction pipes 5 to increase the contact area of steam and the reaction pipes, a kettle liquid inlet pipe 502 and a kettle liquid outlet pipe 503 which penetrate out of the two end parts of the steam heating container are respectively arranged at the two ends of the reaction pipes 5, a plurality of auxiliary material injection pipes 7 are arranged in the steam heating container, one end of the auxiliary material injection pipes 7 is communicated with a steam source and is communicated with each reaction pipe 5 through a plurality of branch pipes 701, the auxiliary Maillard reaction materials are fed into the reaction tube 5 along the branch pipe 701 through steam to be mixed with the rectifying tower bottom liquid, and then are heated by the steam in the steam heating container to generate the Maillard reaction.

In this embodiment, in actual operation, the maillard accessories can be fed into the steam pipeline by pressure and then blown into the reaction tube 5 by steam;

in this embodiment, the steam inlet 201 of the steam heating container is located at a high position, and the steam outlet 202 is located at a low position, so as to facilitate the discharge of distilled water generated by steam condensation;

in this embodiment, the material of the reaction tube 5 is made of metal with good heat conductivity, and the temperature in the reaction tube 5 is controlled to be 80-120 ℃ by controlling the steam pressure, speed and flow rate entering the steam heating container, so as to facilitate the reaction.

Example 11

This embodiment is an improved scheme based on embodiment 10, and the main structure thereof is the same as that of embodiment 10, and the improvement point is that: as shown in fig. 9 and 10, each group two rows of arc guide plates 501 are distributed on the inner wall of the reaction tube 5 of the maillard reaction unit, the two rows of arc guide plates 501 are all parallel to the axial direction of the arc guide plates, the concave surface of each arc guide plate 501 faces one side of the kettle liquid inlet pipe 502, the free end is inclined towards the end of the kettle liquid outlet pipe 503, the two rows of arc guide plates 501 correspond to each other in number one to one, and the two arc guide plates 501 in the corresponding positions in the two rows are staggered, so that the free end of one arc guide plate 501 faces the center of the concave surface of the other arc guide plate 501.

Example 12

This embodiment is another modified scheme based on embodiment 10, and the main structure thereof is the same as that of embodiment 10, and the improvement point is that: as shown in fig. 6-8, the sets of maillard reaction units are arranged in at least 3 maillard reaction unit strings in the steam heating vessel, each maillard reaction unit string radiates from the center to the edge along the radius direction of the steam heating vessel, and each maillard reaction unit string includes at least two sets of maillard reaction units; each group of the Maillard reaction units is also provided with an expansion pipe 6 which is parallel to the reaction pipe 5 and has the same length;

the two ends of the steam heating container are symmetrically provided with converters for controlling the connection and disconnection of the reaction tubes 5 and the expansion tubes 6 in each group of Maillard reaction units, and meanwhile, each expansion tube 6 is internally provided with a steam driving device for driving kettle liquid and Maillard reaction auxiliary materials in the reaction tubes 5 to move back and forth after the reaction tubes 5 are communicated with the expansion tubes 6.

Example 13

This embodiment is an improved scheme based on embodiment 12, and the main structure thereof is the same as that of embodiment 12, and the improvement point is that: as shown in fig. 9-12, each set of the converters comprises a hydraulic chamber 8 located in the center of one end of the steam heating container and a plurality of strip-shaped chambers 9 with one ends communicated with the hydraulic chamber 8 and the other ends closed, and each strip-shaped chamber 9 corresponds to one series of maillard reaction units and is located between a kettle liquid inlet pipe 502 or a kettle liquid outlet pipe 503 and a reaction pipe 5; the hydraulic cavity 8 is communicated with hydraulic equipment through a hydraulic connecting pipe 801 to realize the injection or extraction of hydraulic oil into or out of the hydraulic cavity 8; the hydraulic cavity 8 is actually a closed hollow disc, one end of each strip-shaped cavity 9 is communicated with the inside of the hydraulic cavity 8, and the other end of each strip-shaped cavity is closed;

each strip-shaped cavity 9 comprises a strip-shaped closed cavity 901 with a rectangular cross section, a plurality of liquid passing hole regions 905 are distributed on the side wall of each strip-shaped cavity 9, which is connected with the cavity 901 and the kettle liquid inlet pipe 502 or the kettle liquid outlet pipe 503, a first opening 504 is arranged on the side wall of the cavity 901, which is in contact with the two ends of the reaction pipe 5, the kettle liquid inlet pipe 502 on one side of each reaction pipe 5, the first opening 504 on the side and the liquid passing hole regions 905 on the cavity 901 of the strip-shaped cavity 9 on the side are positioned on the same straight line, so that a kettle liquid inlet pipeline is formed together, and the kettle liquid outlet pipe 503 on the other side of each reaction pipe 5, the first opening 504 on the side and the liquid passing hole regions 905 on the cavity 901 of the strip-shaped cavity 9 on the side are positioned on the same straight line, so that a kettle liquid; the size and shape of the area of the liquid passing hole region 905 corresponds to the size, area and shape of the first opening 504;

the width of the inner wall of the cavity 901 is not less than the diameters of the reaction tube 5 and the expansion tube 6, the cavity 901 is positioned at the end part of the reaction tube 5, sliders 902 corresponding to the number of Maillard reaction units in the Maillard reaction unit string corresponding to the cavity 901 are arranged in the cavity 901, the sliders 902 are connected into a whole through a connecting rod 904, and hydraulic oil is injected into or pumped out of the hydraulic cavity 8 to control the sliders 902 to slide in the cavity 901;

a connecting channel 903 is arranged in each sliding block 902, and openings at two ends of the connecting channel 903 are exposed on the side wall of each sliding block 902 facing the reaction tube 5; the two ends of the expansion pipe 6 are respectively provided with a second opening 602, and when hydraulic oil in the hydraulic cavity 8 controls all the sliding blocks 902 in each strip-shaped cavity 9 to be at the initial position, the sliding blocks 902 are staggered with the corresponding first openings 504 at the end parts of the reaction pipes 5, so that the kettle liquid enters the pipeline and the kettle liquid discharge pipeline are smooth, and then the kettle liquid inlet pipe 502 is opened and the kettle liquid discharge pipe 503 is closed, and then kettle liquid is injected into the reaction pipes 5; when hydraulic oil is injected into the hydraulic cavity 8 to control all the sliding blocks 902 in each strip-shaped cavity 9 to slide to the extreme position, one side of the sliding block 902 completely shields the liquid through the hole area 905, and meanwhile, two openings of the connecting channel 903 in the sliding block are respectively aligned with the first openings 504 at two ends of the reaction tube 5 and the second openings 602 at two ends of the flash tube 6, so that the reaction tube 5 is communicated with the flash tube 6.

Example 14

The present embodiment is another modified scheme based on embodiment 12, and the main structure thereof is the same as embodiment 12, and the improvement point is that: as shown in fig. 9-12, when the slider 902 is in the initial position, both end openings of the inner connecting channel 903 are shielded.

Example 15

The present embodiment is another modified scheme based on embodiment 12, and the main structure thereof is the same as embodiment 12, and the improvement point is that: as shown in fig. 9 to 10, the steam driving device includes a partition block 601 disposed in the middle of the expansion pipe 6 and dividing the axial space thereof into a left part and a right part, a left steam branch pipe 603 and a right steam branch pipe 604 are disposed in the partition block 601, one end of the left steam branch pipe 603 and one end of the right steam branch pipe 604 are respectively communicated with the left part and the right part, when the slide block 902 is at the limit position, steam is injected into the left steam branch pipe 603 and the right steam branch pipe 604, so as to push the kettle liquid and the maillard reaction auxiliary material mixture in the reaction pipe 5 to move to the right side and the left side alternately, so that the reaction is uniform, and the generation of burnt smell is avoided.

Example 16

This embodiment is an improved scheme based on embodiment 15, and the main structure thereof is the same as that of embodiment 15, and the improvement point is that: as shown in fig. 8-10, the other ends of the left steam branch pipe 603 and the right steam branch pipe 604 are respectively communicated with two steam inlet pipes in a steam bag pipe 605, and the steam bag pipe 605 passes through the steam heating capacity.

Example 17

The present embodiment is a further modification made on the basis of embodiment 12, and the main structure thereof is the same as that of embodiment 12, and the improvement point is that: as shown in fig. 8, the sets of maillard reaction units are arranged in 6-way, 8-way or 12-way maillard reaction unit strings in the steam heating vessel, and each of the maillard reaction unit strings has 3 sets of maillard reaction units.

Compared with the existing maillard reactor with other heating forms and structures, the maillard reactor provided by the embodiment 10-17 of the invention has the following beneficial effects:

1) the Maillard reactor can fully react the rectifying tower kettle liquid with Maillard auxiliary materials, further complete the treatment of the kettle liquid, enable the kettle liquid to have better flavor, finally obtain the additive which can be directly used in food after spray drying, not only realize the utilization of nutrient components in the kettle liquid and prevent the loss and waste of the nutrient components, but also change waste into valuables, save the kettle liquid treatment cost and simultaneously realize additional economic benefit;

2) the Maillard reactor mixes the kettle liquid and Maillard reaction auxiliary materials in a plurality of groups of reaction tubes, the reaction tubes are positioned in a steam heating container, steam is injected into the steam heating container, the kettle liquid is heated by utilizing the contact heat transfer of the steam and the outer wall of the reaction tubes, and the Maillard reaction is carried out;

meanwhile, as the Maillard reaction auxiliary materials are fed into the reaction tube through steam, in the process, the steam is contacted with the auxiliary materials and is heated in advance, so that certain fragrance is generated before the auxiliary materials enter the kettle liquid, and the reaction rate can be greatly accelerated after the auxiliary materials are added into the kettle liquid;

3) in the Maillard reactor, the two rows of arc-shaped guide plates with special structures are arranged on the inner wall of the reaction tube, so that the heat transfer area can be increased, the internal kettle liquid is heated more uniformly, and auxiliary materials and the kettle liquid are mixed more uniformly;

4) in the Maillard reactor, the expansion pipe with the same length as the reaction pipe is arranged, the converter at two ends is used for realizing the connection or disconnection of the reaction pipe and the expansion pipe, kettle liquid and auxiliary materials are injected into the reaction pipe when the reaction pipe and the expansion pipe are disconnected, then the reaction pipe is communicated with the expansion pipe, the expansion pipe is internally provided with the steam driving device, the core of the steam driving device is provided with two steam branch pipes, the steam is injected into the two steam branch pipes in turn, and the mixture of the kettle liquid and the auxiliary materials is pushed by the steam to move back and forth in a pipeline formed after the reaction pipe and the expansion pipe are communicated, so that the heating efficiency and the heating uniformity are improved, the generation of scorched smell is prevented, in addition, the direct contact heating of the kettle liquid by the steam is realized due to the adoption of the steam driving, and the reaction efficiency.

Claims

1. A system for recovering the nutrient contents in the rectifying tower residue in the production of soybean polysaccharide is characterized in that: the system comprises a kettle liquid concentration tank (1), a Maillard reactor (2) and a spray dryer (3), wherein the kettle liquid of a rectifying tower firstly enters the kettle liquid concentration tank (1) to form concentrated liquid after concentration, the concentrated liquid enters the Maillard reactor (2) to carry out Maillard reaction after salt and pigment in the concentrated liquid are removed by a first membrane separator, mixed liquid after reaction is filtered by a second membrane separator and then enters the spray dryer (3) to carry out spray drying, and finally a light brown powdery product is obtained.

2. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide according to claim 1, wherein the system comprises: the kettle liquid concentration tank (1) comprises a closed concentration tank body (101) with a detachable top cover at the upper part, a pneumatic valve (102) is arranged on the top cover, a plurality of concentration pots (4) with the same size are arranged in the concentration tank body (101), and gaps are arranged among the concentration pots (4);

each concentration pot (4) comprises a pot body (401) with an open top and an arc-shaped bottom, the side wall and the bottom wall of the pot body (401) are of a hollow structure with a heating cavity (403), steam is injected into the heating cavity (403) to heat and concentrate kettle liquid in the pot body (401), the upper part of the heating cavity (403) is provided with a communication hole, the communication hole is connected with an exhaust pipe (404) arranged on the inner wall of the pot body (401), the bottom end of the exhaust pipe (404) extends to the bottom in the pot body (401) and is communicated with a steam discharge pipe (405) surrounding the inner wall of the pot body (1), and the steam discharge pipe (405) is provided with two rows of exhaust holes along the length direction thereof, wherein the two rows of exhaust holes respectively incline towards the upper part and the lower part of the center of the pot; the top of the pan body (401) is provided with a kettle liquid injection pipe (105) for injecting kettle liquid into the pan body through a liquid discharge branch pipe (1051) and a concentrated liquid extraction pipe (106) for extracting the concentrated liquid in the pan body (401) through a liquid extraction branch pipe (1061);

the bottom wall of the concentrating tank body (101) is of a hollow structure with a steam buffer cavity (107), a heating cavity (403) in a tank body (401) of each concentrating tank (4) is communicated with the steam buffer cavity (107) through an air inlet branch pipe (109), and the steam buffer cavity (107) is communicated with an external steam source through a steam inlet pipe (108).

3. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide as claimed in claim 2, wherein: the concentrating tank body (101) is cylindrical, all the concentrating pots (4) are arranged into a plurality of layers around the center of the concentrating tank body (101), the concentrating pot (4) of each layer is in a circle with the center of the concentrating tank body (101) as the circle center, gaps are formed between every two adjacent concentrating pots (4), and gaps are also formed between every two adjacent concentrating pots (4); all concentration pots (4) of each layer all share the same kettle liquid injection pipe (105) and the concentrated solution extraction pipe (106), the kettle liquid injection pipe (105) and the concentrated solution extraction pipe (106) are all annular pipes, the kettle liquid injection pipe (105) and the concentrated solution extraction pipe (106) of each layer of concentration pot (4) are communicated with the kettle liquid injection header pipe (103) and the concentrated solution extraction header pipe (104) which are arranged at the center of the concentration pot body (101), one end, located in the concentration pot body (101), of the kettle liquid injection header pipe (103) and the concentrated solution extraction header pipe (104) is closed, the other end extends out of the concentration pot body (101) and then is connected with two liquid pumps respectively, and the injection of kettle liquid and the extraction of the concentrated solution are achieved through the two liquid pumps.

4. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide as claimed in claim 2, wherein: electromagnetic valves are arranged on a liquid drainage branch pipe (1051) and a liquid extraction branch pipe (1061) in each pot body (401), the electromagnetic valves are switched on and off by a PLC intelligent controller, a liquid level sensor for monitoring the height of the kettle liquid in each pot body (401) is arranged in each pot body (401), and the liquid level sensor marks three liquid level heights, namely a liquid level highest point H, a liquid level lowest point L and a liquid level middle point M, wherein the highest point H represents the maximum volume of the kettle liquid contained in the pot body (401), the liquid level lowest point L represents the minimum volume of the kettle liquid contained in the pot body (401), and the liquid level middle point M represents the liquid level height when the inner volume of the pot body (401) is the maximum volume 1/3; the liquid level sensor transmits the monitored liquid level data to the PLC intelligent controller, so that the PLC intelligent controller controls the opening or closing of the electromagnetic valves on the liquid drainage branch pipe (1051) and the liquid pumping branch pipe (1061) according to the monitored liquid level height.

5. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide as claimed in claim 2, wherein: the bottom of each pot body (401) is supported on the bottom wall of the concentrating tank body (101) by at least three support legs (402), and a gap is formed between the bottom wall of the pot body (401) and the bottom wall of the concentrating tank body (101).

6. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide according to claim 1, wherein the system comprises: the spray dryer (3) comprises a cylindrical barrel (301), a hollow liquid spraying plate (305) is arranged at the top of the barrel (301), and the kettle liquid to be spray-dried enters a cavity inside the liquid spraying plate (305) through a kettle liquid inlet pipe (306) and is uniformly sprayed into the barrel (301) through a plurality of atomizing nozzles distributed at the bottom of the liquid spraying plate (305);

at least three groups of steam injection pipes (302) are uniformly distributed on the inner wall of the cylinder body (301) along the height direction of the cylinder body, each group of steam injection pipes (302) is a hollow pipe arranged around the inner wall of the cylinder body (301), a circle of spray holes are distributed on the side surface of the hollow pipe facing the center of the cylinder body (1), and the spray holes are inclined upwards, so that drying steam introduced into the hollow pipe forms a conical upward steam curtain after being sprayed out by the spray holes, and meets and contrasts with mist kettle liquid sprayed out by an atomizing spray head for drying;

the bottom of the cylinder body (301) is provided with a material receiving part (303) with an inverted frustum shape, the small diameter end of the material receiving part (303) is arranged at the lower end, and a dry powder discharge hole (304) is formed.

7. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide according to claim 6, wherein the system comprises: the upper part of each group of the steam injection pipes (302) is provided with an inclined annular baffle (3011), the upper end of the annular baffle (3011) is tightly attached to the inner wall of the cylinder body (301), and the bottom end of the annular baffle is tangent to the outer wall of the steam injection pipe (302), so that dry powder formed after drying is prevented from being accumulated on the steam injection pipe (302).

8. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide according to claim 6, wherein the system comprises: the liquid spraying plate (305) is provided with a channel for communicating the cylinder body (301) with the outside, and an exhaust valve (3012) is arranged at the outer port of the channel so as to facilitate the discharge of steam in the cylinder body (301).

9. The system for recovering the nutrient contents of the rectifying tower bottoms in the production of soybean polysaccharide according to claim 6, wherein the system comprises: a heating steam pipeline (307) is arranged in the center of the cylinder (301), the heating steam pipeline (307) is communicated with the steam jet pipe (302) through a plurality of connecting pipes, and the top end of the heating steam pipeline penetrates through the liquid jet plate (305) and is communicated with an external dry steam source;

the cross section of the heating steam pipeline (307) is annular, dry steam flows in an annular cavity, a transmission shaft (308) is arranged in the center of the annular, the transmission shaft (308) is rotatably connected with the inner wall of the heating steam pipeline (307) through a plurality of groups of bearings, the top of the transmission shaft (308) penetrates out of the heating steam pipeline (307) and is driven to rotate by a speed reducer (3010) driven by a motor, the bottom end of the transmission shaft (308) drives a scraper (309) located on the inner wall of the material receiving part (303) to move along the inner wall of the material receiving part (303) through a connecting rod, and therefore dry powder on the inner wall of the material receiving part (303) is scraped to be discharged through a dry powder discharge hole (304).