A continuous fermentation device for producing sugar alcohol

Abstract

The utility model belongs to the technical field of sugar alcohol production, and particularly relates to a continuous fermentation device for sugar alcohol production. It includes a batching tank, which is sequentially connected with a feed pump, a horizontal fermentation tank, an online reducing sugar detector, a fermentation liquid storage tank, a fermentation liquid pump, a ceramic membrane system, and a refined liquid storage tank through a pipeline, and the online reducing sugar detector is connected in parallel with a reflux pipe, and the reflux pipe is connected to the pipeline at the input end of the feed pump. A stirrer and a vent pipe are installed in the horizontal fermentation tank, and the stirring shaft of the stirrer is connected with a rotating shaft through a sprocket structure, and a plurality of baffles are connected to the bearing on the rotating shaft, and a rake type defoamer is fixedly connected to the rotating shaft in front of the baffle, and a plurality of vent holes are provided on the vent pipe, and the vent pipe is connected with a vent valve, and the batching tank, the feed pump, the horizontal fermentation tank, and the online reducing sugar detector are electrically connected with the fermentation controller. The utility model can realize the continuous fermentation of sugar alcohol liquid, and at the same time solve the problem that the purity of the fermentation liquid is reduced due to the use of chemical defoaming in the horizontal fermentation tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of sugar alcohol production, and particularly relates to a continuous fermentation device for sugar alcohol production. Background Art

[0002] The production of sugar alcohol products by microbial fermentation has the advantages of cleanliness, environmental protection, safety, stability, etc. For example, xylose is converted into xylitol after fermentation, glucose is converted into erythritol after fermentation, and maltose is converted into maltitol after fermentation. In the process of microbial fermentation, three common methods are usually used: batch fermentation, batch feed fermentation, and continuous fermentation. Batch fermentation is to add a certain amount of culture medium and microorganisms to the reactor at one time, ferment in the reactor, and harvest until the end of fermentation. This fermentation method has the disadvantages of low production capacity, high human intervention requirements, and high equipment cost. Batch feed fermentation is to add feed to batch fermentation, supplement nutrients and substrates in the reactor, which can extend the reaction time and increase yield. Continuous fermentation refers to a culture method in which the culture medium and microorganisms are continuously input into the reactor at the same speed, and the product is continuously output to ferment, so that the state variables in the culture system are constant. This fermentation method can maintain the stability of the number of microorganisms and nutrient concentration in the reactor, and can infinitely extend the logarithmic growth period of microorganisms in batch culture, maintain a stable growth rate of microorganisms, and maintain the cell concentration, total bacterial volume, and culture volume in the fermenter. Compared with batch fermentation and fed-batch fermentation, continuous fermentation has uniform product quality, high yield and production capacity, and can reduce the time for each cleaning, loading, disinfection, inoculation, and tank placement in batch culture and fermentation, saving manpower and material resources, reducing costs, and improving production efficiency. At the same time, the equipment size is reduced, the investment is reduced, and it is easy to mechanize and automate control. It represents the current development direction of fermentation technology and has attracted the attention of more and more researchers.

[0003] At present, vertical fermentation tanks are mostly used for continuous fermentation. However, when the height-to-diameter ratio increases, the ventilation pressure is high and the energy consumption for stirring is high. Horizontal fermentation tanks can solve this problem. However, since horizontal fermentation tanks are placed horizontally, they cannot be mechanically defoamed like vertical fermentation tanks. The use of chemical defoaming will lead to complex composition of the fermentation liquid, especially sugar alcohol liquid, which has high requirements for purity. The addition of defoaming agents will lead to high purification costs. Summary of the invention

[0004] The utility model aims to provide a continuous fermentation device for producing sugar alcohols to solve the problems existing in the prior art.

[0005] The utility model adopts the following technical scheme to solve the technical problems: a continuous fermentation device for producing sugar alcohols, comprising a batching tank, wherein the batching tank is sequentially connected with a feed pump, a horizontal fermentation tank, an online reducing sugar detector, a fermentation liquid storage tank, a fermentation liquid pump, a ceramic membrane system, and a refined liquid storage tank through pipelines; the online reducing sugar detector is connected with a reflux pipe in parallel, and the reflux pipe is connected to a pipeline at the input end of the feed pump; an agitator and a vent pipe are installed in the horizontal fermentation tank; the agitator shaft of the agitator is connected with a rotating shaft through a sprocket structure; a plurality of baffles are connected to the bearings on the rotating shaft; a rake-type defoamer is fixedly connected to the rotating shaft in front of the baffles; a plurality of vent holes are provided on the vent pipe, the vent pipe is connected with a vent valve, and the batching tank, the feed pump, the horizontal fermentation tank, the online reducing sugar detector and the fermentation controller are electrically connected.

[0006] Furthermore, the batching tank is a tank body with a jacket and stirring. There are two batching tanks. The batching tanks are connected to a drain valve and a steam valve through a pipeline. A batching valve is installed on the pipeline at the discharge end of the batching tank. After the two batching tanks are connected in parallel, the feed end of the feed pump is connected through a pipeline. The batching tank is electrically connected to the fermentation controller through the batching valve.

[0007] Furthermore, a check valve is installed on the pipeline at the discharge end of the feed pump, a reflux valve is installed on the reflux pipe, and a discharge valve is installed on the pipeline at the feed end of the fermentation liquid storage tank. The reflux valve and the discharge valve are electrically connected to the fermentation controller.

[0008] Furthermore, the horizontal fermentation tank is a cylindrical horizontal fermentation tank with a jacket, the aspect ratio of the horizontal fermentation tank is 5:1, the horizontal fermentation tank is connected with an acid-base valve, an air outlet valve, and a steam valve through a pipeline, the jacket of the horizontal fermentation tank is connected with a water outlet valve and two thermostatic valves, a temperature sensor and a pH meter are installed on the horizontal fermentation tank, and the horizontal fermentation tank is electrically connected to a fermentation controller through an agitator, an acid-base valve, an air outlet valve, a thermostatic valve, a water outlet valve, a temperature sensor, and a pH meter.

[0009] Furthermore, the top of the baffle is arc-shaped, and the two sides of the baffle are bent to gather the foam in the middle position. The arc-shaped top of the baffle matches the shape of the inner wall of the horizontal fermentation tank and is spot welded to the inner wall of the horizontal fermentation tank.

[0010] Furthermore, the shaft bearing is connected to the middle position of the baffle, the rake defoamer includes a shaft sleeve and a plurality of rake rods, rake teeth, and bolts, the plurality of rake rods are welded to the shaft sleeve, the plurality of rake teeth are welded to the rake rods, the shaft sleeve is provided with a plurality of inner thread holes, the bolts are threaded in the inner thread holes and supported on the shaft, and the rake defoamer is fixed to the shaft through the shaft sleeve, the bolts, and the inner thread holes.

[0011] Furthermore, the fermentation controller is a computer for setting process parameters and controlling the fermentation process.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model can realize the continuous fermentation of sugar alcohol liquid, and solve the problem that the purity of fermentation liquid is reduced due to the use of chemical defoaming in horizontal fermentation tanks.

[0014] 2. The materials with high reducing sugar content at the beginning of fermentation are refluxed through the reflux pipe and reflux valve to prevent unqualified materials from entering the fermentation liquid storage tank, and at the same time, forced circulation is performed to increase the stirring effect.

[0015] 3. The foam is gathered by the baffle, and the rake defoamer physically defoams the foam, so as to achieve the purpose of rapid defoaming, thereby solving the problem of reduced purity of fermentation liquid caused by chemical defoaming in horizontal fermentation tanks.

[0016] 4. The temperature inside the horizontal fermentation tank is detected by the temperature sensor, and the opening and closing and opening degree of the two temperature regulating valves are automatically controlled by the fermentation controller, so as to regulate the temperature inside the horizontal fermentation tank.

[0017] 5. The pH of the fermentation liquid is detected by a pH meter, and the fermentation controller controls the opening and closing of the acid-base valve. When the pH value of the fermentation liquid deviates from the set value, the pH is adjusted.

[0018] 6. The fermentation controller controls the opening and closing and opening degree of the ventilation valve, thereby controlling the ventilation volume. The ventilation pipe disperses the compressed air evenly, so that the air can evenly contact the fermentation liquid, thereby increasing the dissolved oxygen effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Figure 2 The utility model is a schematic diagram of the cross-sectional structure of a rake-type defoamer and a baffle in a side view.

[0021] Figure 3 It is a front structural schematic diagram of a rake-type defoamer and a baffle of the utility model.

[0022] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure in the middle.

[0023] Figure 5 It is a schematic diagram of the top view structure of the rake type defoamer and the baffle of the utility model.

[0024] Figure 6 This is the material flow situation in the horizontal fermentation tank of the utility model.

[0025] Among them: 1. batching tank; 2. feed pump; 3. horizontal fermentation tank; 4. online reducing sugar detector; 5. fermentation liquid storage tank; 6. fermentation liquid pump; 7. ceramic membrane system; 8. refined liquid storage tank; 9. pipeline; 10. reflux pipe; 11. agitator; 12. ventilation pipe; 13. sprocket structure; 14. rotating shaft; 15. baffle; 16. rake defoamer; 17. vent hole; 18. ventilation valve; 19. drain valve; 20. steam valve; 21. batching valve; 22. check valve; 23. reflux valve; 24. discharge valve; 25. acid-base valve; 26. outlet valve; 27. thermostatic valve; 28. water outlet valve; 29. ​​temperature sensor; 30. pH meter; 31. rake rod; 32. rake teeth; 33. bolts; 34. bushing; 35. inner thread hole. DETAILED DESCRIPTION

[0026] The utility model will now be further described in detail with reference to the accompanying drawings.

[0027] like Figure 1-5 As shown, a continuous fermentation device for producing sugar alcohols comprises a batching tank 1, which is sequentially connected to a feed pump 2, a horizontal fermentation tank 3, an online reducing sugar detector 4, a fermentation liquid storage tank 5, a fermentation liquid pump 6, a ceramic membrane system 7, and a refined liquid storage tank 8 through a pipeline 9, the online reducing sugar detector 4 is connected in parallel with a reflux pipe 10, the reflux pipe 10 is connected to the pipeline 9 at the input end of the feed pump 2, an agitator 11 and a vent pipe 12 are installed in the horizontal fermentation tank 3, the agitator shaft of the agitator 11 is connected to a rotating shaft 14 through a sprocket structure 13, a plurality of baffles 15 are connected to the bearing on the rotating shaft 14, a rake type defoamer 16 is fixedly connected to the rotating shaft 14 in front of the baffle 15, a plurality of vent holes 17 are provided on the vent pipe 12, the vent pipe 12 is connected to a vent valve 18, the batching tank 1, the feed pump 2, the horizontal fermentation tank 3, the online reducing sugar detector 4 and the fermentation controller are electrically connected.

[0028] The batching tank 1 is a tank body with a jacket and stirring. There are two batching tanks 1. The batching tank 1 is connected to an emptying valve 19 and a steam valve 20 through a pipeline 9. A batching valve 21 is installed on the pipeline 9 at the discharge end of the batching tank 1. After the two batching tanks 1 are connected in parallel, they are connected to the feed end of the feed pump 2 through the pipeline 9. The batching tank 1 is electrically connected to the fermentation controller through the batching valve 21.

[0029] A check valve 22 is installed on the pipe 9 at the discharge end of the feed pump 2, a reflux valve 23 is installed on the reflux pipe 10, and a discharge valve 24 is installed on the pipe 9 at the feed end of the fermentation liquid storage tank 5. The reflux valve 23 and the discharge valve 24 are both electrically connected to the fermentation controller.

[0030] The horizontal fermentation tank 3 is a cylindrical horizontal fermentation tank with a jacket. The aspect ratio of the horizontal fermentation tank 3 is 5:1. The horizontal fermentation tank 3 is connected to an acid-base valve 25, an air outlet valve 26, and a steam valve 20 through a pipeline 9. The jacket of the horizontal fermentation tank 3 is connected to a water outlet valve 28 and two thermostatic valves 27. A temperature sensor 29 and a pH meter 30 are installed on the horizontal fermentation tank 3. The horizontal fermentation tank 3 is electrically connected to a fermentation controller through an agitator 11, an acid-base valve 25, an air outlet valve 26, a thermostatic valve 27, a water outlet valve 28, a temperature sensor 29, and a pH meter 30.

[0031] The fermentation liquid overflows from the discharge end of the horizontal fermentation tank 3. After being detected by the online reducing sugar detector 4, if the reducing sugar content exceeds the set value, the reflux valve 23 is opened to overflow into the feed end of the feed pump 2, and the dosing valve 21 is closed at the same time to allow the overflowing liquid to be pumped back into the horizontal fermentation tank 3 through the feed pump 2 until the reducing sugar content of the fermentation liquid is lower than the set value. After the reducing sugar content of the fermentation liquid is lower than the set value, the discharge valve 24 is opened to enter the fermentation liquid storage tank 5, and the dosing valve 21 is opened at the same time. The fermentation controller controls the opening and closing and opening degree of the dosing valve 21 to control the liquid to continuously enter the horizontal fermentation tank 3. The fermented fermentation liquid continuously overflows from the discharge end of the horizontal fermentation tank 3 and enters the fermentation liquid storage tank 5, thereby achieving continuous fermentation.

[0032] The top of the baffle 15 is arc-shaped, and the two sides of the baffle 15 are bent to gather the foam in the middle position. The arc-shaped top of the baffle 15 matches the shape of the inner wall of the horizontal fermentation tank 3 and is spot welded to the inner wall of the horizontal fermentation tank 3.

[0033] The bearing of the rotating shaft 14 is connected to the middle position of the baffle 15. The rake defoamer 16 includes a sleeve 34 and a plurality of rake rods 31, rake teeth 32, and bolts 33. The plurality of rake rods 31 are welded to the sleeve 34, and the plurality of rake teeth 32 are welded to the rake rods 31. The sleeve 34 is provided with a plurality of inner thread holes 35. The bolts 33 are threaded in the inner thread holes 35 and are pressed against the rotating shaft 14. The rake defoamer 16 is fixed to the rotating shaft 14 through the sleeve 34, the bolts 33, and the inner thread holes 35.

[0034] like Figure 6 As shown, after the agitator 11 is turned on, the liquid feed is pushed forward, and after hitting the inner wall, it is split and returned, thereby forming two upper and lower material flows in the horizontal fermentation tank 3. The foam above moves to the baffle 15 with the material flow and gathers in the middle. The agitator 11 drives the rotating shaft 14 to rotate through the sprocket structure 13, and the rake defoamer 16 physically defoams the foam, wherein the sprocket structure 13 is a common gear and chain structure.

[0035] The fermentation controller is a computer used to set process parameters and control the fermentation process.

[0036] The working principle of the utility model is:

[0037] Before use, open the steam valve 20 to sterilize the batching tank 1 and the horizontal fermentation tank 3. When in use, batching is performed in the batching tank 1. The two batching tanks 1 are used alternately. After batching is completed, the fermentation controller opens the batching valve 21 and the feed pump 2 to pump the feed liquid into the horizontal fermentation tank 3.

[0038] After the agitator 11 is turned on, it pushes the liquid forward, and after hitting the inner wall, it is split and returned, thereby forming two upper and lower material flows in the horizontal fermentation tank 3. The foam above moves to the baffle 15 with the material flow and gathers in the middle. The agitator 11 drives the rotating shaft 14 to rotate through the sprocket structure 13, and the rake defoamer 16 physically defoams the foam, wherein the sprocket structure 13 is a common gear and chain structure.

[0039] The fermentation liquid overflows from the discharge end of the horizontal fermentation tank 3. After being detected by the online reducing sugar detector 4, if the reducing sugar content exceeds the set value, the reflux valve 23 is opened to overflow into the feed end of the feed pump 2, and the dosing valve 21 is closed at the same time to allow the overflowing liquid to be pumped back to the horizontal fermentation tank 3 through the feed pump 2 until the reducing sugar content of the fermentation liquid is lower than the set value. After the reducing sugar content of the fermentation liquid is lower than the set value, the discharge valve 24 is opened to enter the fermentation liquid storage tank 5, and the dosing valve 21 is opened at the same time. The fermentation controller controls the opening and closing and opening of the dosing valve 21 to control the liquid to continuously enter the horizontal fermentation tank 3. The fermented fermentation liquid continuously overflows from the discharge end of the horizontal fermentation tank 3 and enters the fermentation liquid storage tank 5, thereby realizing continuous fermentation. The fermentation liquid is pumped into the ceramic membrane system 7 through the fermentation liquid pump 6 for bacterial filtration, and finally enters the refined liquid storage tank 8.

[0040] The two thermostatic valves 27 are respectively connected to the hot water pipe and the cold water pipe in the workshop. The temperature sensor 29 detects the temperature in the horizontal fermentation tank 3. The fermentation controller automatically controls the opening and closing and the opening degree of the two thermostatic valves 27, thereby regulating the temperature in the horizontal fermentation tank 3.

[0041] The acid-base valve 25 is connected to the acid tank or alkali tank in the workshop, which needs to be selected according to the fermentation conditions. The pH value of some sugar alcohol production fermentation processes will decrease, and it is necessary to connect the alkali tank, otherwise it is necessary to connect the acid tank. The pH meter 30 detects the pH of the fermentation liquid, and the fermentation controller controls the opening and closing and opening of the acid-base valve 25. When the pH value of the fermentation liquid deviates from the set value, the pH is adjusted.

[0042] For an aerobic fermentation process, the ventilation valve 18 is connected to a clean compressed air pipeline, and the fermentation controller controls the opening and closing and the opening degree of the ventilation valve 18, thereby controlling the ventilation volume. The ventilation pipe 12 disperses and evenly distributes the compressed air, and the outlet valve 26 discharges the air out of the horizontal fermentation tank 3.

[0043] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention.

[0044] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A continuous fermentation device for producing sugar alcohols, characterized in that: The invention comprises a batching tank, which is sequentially connected with a feed pump, a horizontal fermentation tank, an online reducing sugar detector, a fermentation liquid storage tank, a fermentation liquid pump, a ceramic membrane system, and a refined liquid storage tank through pipelines; a reflux pipe is connected in parallel with the online reducing sugar detector, and the reflux pipe is connected to a pipeline at the input end of the feed pump; an agitator and a vent pipe are installed in the horizontal fermentation tank; the agitator shaft of the agitator is connected with a rotating shaft through a sprocket structure; a plurality of baffles are connected to the bearings on the rotating shaft; a rake-type defoamer is fixedly connected to the rotating shaft in front of the baffles; a plurality of vent holes are provided on the vent pipe, and the vent pipe is connected with a vent valve; the batching tank, the feed pump, the horizontal fermentation tank, the online reducing sugar detector and the fermentation controller are electrically connected.

2. The continuous fermentation device for producing sugar alcohol according to claim 1, characterized in that: The batching tank is a tank body with a jacket and stirring. There are two batching tanks. The batching tanks are connected to an emptying valve and a steam valve through pipelines. A batching valve is installed on the pipeline at the discharge end of the batching tank. After the two batching tanks are connected in parallel, they are connected to the feed end of the feed pump through a pipeline. The batching tanks are electrically connected to the fermentation controller through the batching valve.

3. The continuous fermentation device for producing sugar alcohol according to claim 1, characterized in that: A check valve is installed on the pipeline at the discharge end of the feed pump, a reflux valve is installed on the reflux pipe, and a discharge valve is installed on the pipeline at the feed end of the fermentation liquid storage tank. The reflux valve and the discharge valve are both electrically connected to the fermentation controller.

4. The continuous fermentation device for producing sugar alcohol according to claim 1, characterized in that: The horizontal fermentation tank is a cylindrical horizontal fermentation tank with a jacket, the aspect ratio of the horizontal fermentation tank is 5:1, the horizontal fermentation tank is connected with an acid-base valve, an air outlet valve, and a steam valve through a pipeline, the jacket of the horizontal fermentation tank is connected with a water outlet valve and two thermostatic valves, a temperature sensor and a pH meter are installed on the horizontal fermentation tank, and the horizontal fermentation tank is electrically connected to a fermentation controller through an agitator, an acid-base valve, an air outlet valve, a thermostatic valve, a water outlet valve, a temperature sensor, and a pH meter.

5. The continuous fermentation device for producing sugar alcohol according to claim 4, characterized in that: The top of the baffle is arc-shaped, and the two sides of the baffle are bent to gather the foam in the middle position. The arc-shaped top of the baffle matches the shape of the inner wall of the horizontal fermentation tank and is spot welded on the inner wall of the horizontal fermentation tank.

6. The continuous fermentation device for producing sugar alcohol according to claim 5, characterized in that: The shaft bearing is connected to the middle position of the baffle, the rake defoamer comprises a shaft sleeve and a plurality of rake rods, rake teeth and bolts, the plurality of rake rods are welded to the shaft sleeve, the plurality of rake teeth are welded to the rake rods, the shaft sleeve is provided with a plurality of inner thread holes, the bolts are threaded in the inner thread holes and supported on the shaft, and the rake defoamer is fixed to the shaft through the shaft sleeve, the bolts and the inner thread holes.

7. The continuous fermentation device for producing sugar alcohol according to claim 1, characterized in that: The fermentation controller is a computer used to set process parameters and control the fermentation process.

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