A medium-sized high mass transfer circulating ventilated fermenter

Abstract

The present invention discloses a medium-sized high mass transfer circulating ventilated fermenter, which relates to the field of biological fermentation technology, including a fermenter body, a cooling jet pipe provided in the fermenter body; a circulation drum is also fixedly provided in the fermenter body, and the top and bottom of the circulation drum are both open; the bottom of the circulation drum is also connected to a ventilation pipe, the first end of the ventilation pipe is arranged at the bottom of the circulation drum, and the second end of the ventilation pipe extends out of the fermenter body; the first end of the ventilation pipe opens downward and is connected to an air distribution head, the top of the air distribution head is connected to the first end of the ventilation pipe, the bottom of the air distribution head is closed, the side wall of the air distribution head is connected to a three-phase mixing rotator through a gas branch pipe, the feed port of the three-phase mixing rotator is connected to the gas branch pipe, and the discharge port of the three-phase mixing rotator is located outside the circulation drum. The present invention aims to provide good engineering conditions for ventilated biological reactions, achieve complete removal of mechanical stirring, and improve the energy saving effect of the fermentation process.

Description

Technical Field

[0001] The invention relates to the technical field of biological fermentation, in particular to a medium-sized high-mass transfer circulating ventilation fermenter. Background Art

[0002] Domestic fermentation industries for antibiotics, vitamins, amino acids, organic acids, and other products almost all use universal ventilated stirred reactor technology for industrial production. For decades, there has been no major breakthrough in fermentation equipment, and the fermentation process has always been plagued by high energy consumption and low ventilation oxygen utilization.

[0003] In the fermentation industry, energy consumption (air oxygen supply, steam sterilization, stirring power consumption, circulating water cooling) accounts for 20% to 30% of the total product cost, of which stirring for fermentation accounts for 20% to 40% of the total energy consumption; by analyzing the state of the fermentation process in terms of fluid mechanics, fermentation engineering, and large-scale antibiotic production practice, a new fermentation tank structure is adopted, which can not only meet the engineering condition requirements of various bacterial genera and fermentation products of the biological kingdom, but also meet the requirements of completely eliminating stirring and achieving 20% to 40% energy saving in the fermentation process; many fermentation varieties are suitable for medium-sized fermentation tanks (for example, a single tank with a volume of 30m 3 ~100m 3 ), which has been widely promoted and implemented on medium-sized tanks. Based on the fact that medium-sized fermentation tanks account for 25% of the total volume in China, it is predicted that the fermentation industry can save 400 million to 600 million yuan per year in energy savings. Summary of the Invention

[0004] The purpose of the present invention is to provide a medium-sized high mass transfer circulating ventilated fermenter to solve the problems existing in the above-mentioned prior art, completely eliminate mechanical stirring, and improve the energy saving effect of the fermentation process.

[0005] To achieve the above-mentioned objectives, the present invention provides the following solution: The present invention provides a medium-sized high mass transfer circulating ventilated fermentation tank, comprising a fermentation tank body, wherein a cooling jet is provided in the fermentation tank body; a circulation cylinder is also fixedly provided in the fermentation tank body, and the top and bottom of the circulation cylinder are both open; the bottom of the circulation cylinder is also connected to a ventilation pipe, the first end of the ventilation pipe is provided at the bottom of the circulation cylinder, and the second end of the ventilation pipe extends out of the fermentation tank body; the first end of the ventilation pipe opens downward and is connected to an air distribution head, the top of the air distribution head is connected to the first end of the ventilation pipe, the bottom of the air distribution head is closed, the side wall of the air distribution head is connected to a three-phase mixing rotator through a gas branch pipe, the feed port of the three-phase mixing rotator is connected to the gas branch pipe, and the discharge port of the three-phase mixing rotator is located outside the circulation cylinder.

[0006] Preferably, the bottom of the circulation drum is fixed to the inner bottom of the fermentation tank body through a first support, and the inner bottom of the fermentation tank body is further provided with a second support for supporting the three-phase mixing rotor.

[0007] Preferably, the first support is a T-shaped support, the second support is an N-shaped support, and the three-phase hybrid rotator is fixedly connected to the second support via a fixing member.

[0008] Preferably, the bottom of the air distribution head is located above the bottom opening of the circulation cylinder.

[0009] Preferably, a plurality of the gas branch pipes are provided on the side wall of the air distribution head, each of the gas branch pipes is connected to one of the three-phase mixing rotators, and the plurality of the three-phase mixing rotators are evenly distributed along the circumference.

[0010] Preferably, each of the three-phase mixing rotators is provided with a plurality of discharge ports, and the discharge ports are arranged horizontally and vertically connected to the three-phase mixing rotator.

[0011] Preferably, the three-phase mixing rotator includes a cylindrical barrel, one end of which is provided with the feed port, which is located in the circulation barrel and is used to communicate with the gas branch pipe, and the other end of the barrel is provided with the discharge port, which extends out of the circulation barrel.

[0012] Preferably, the feed port and the discharge port of the three-phase mixing rotator are both conical structures, and the small end of the feed port and the small end of the discharge port are both arranged close to the barrel.

[0013] Preferably, the diameter of the gas branch pipe gradually decreases at one end close to the three-phase mixing rotator, the diameter of the gas branch pipe is smaller than the diameter of the feed port of the three-phase mixing rotator, and a gap is provided between the outer wall of the gas branch pipe and the inner wall of the feed port.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The present invention adopts a new fermentation tank structure, which meets the requirements of completely eliminating stirring and achieving 20% to 40% energy saving in the fermentation process; and realizes the engineering three-transmission and one-reaction conditions of directional, no retention zone, high gas holdup, and high-speed rotation mixing, fully meeting the ventilation fermentation conditions of various products in medium-sized fermentation tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of a medium-sized high mass transfer circulating ventilation fermenter;

[0018] Figure 2 for Figure 1 AA cross-section of

[0019] In the figure, 1 is the fermentation tank body, 2 is the circulation cylinder, 3 is the three-phase mixing rotor, 4 is the first support, 5 is the second support, 6 is the air distribution head, and 7 is the fixing part. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1-2 As shown, this embodiment provides a medium-sized high mass transfer circulating ventilated fermentation tank, including a fermentation tank body 1, wherein the fermentation tank body 1 is provided with cooling lances, wherein the fermentation tank body 1 can be a conventional fermentation tank body 1, which is provided with a feed port and a discharge port to realize feeding and discharging, etc. The cooling lances are existing devices, and the fermentation heat of the biological reaction process needs to be taken away by circulating water inter-wall heat exchange to maintain the purpose of fermentation temperature control. There are multiple groups of cooling lances, which are coiled up and down along the inner wall of the fermentation tank body 1 and hung on the support platform of the inner wall of the fermentation tank body 1. Circulating cooling water is passed into the cooling lances to take away the fermentation heat of the biological reaction process. A circulation drum 2 is also fixedly provided in the fermentation tank body 1, and the top and bottom of the circulation drum 2 are both open, the top opening is for material entry, and the bottom opening is for discharge.

[0024] The bottom of the cylinder body of the circulating cylinder 2 is also connected to a ventilation pipe, the first end of the ventilation pipe is arranged at the bottom of the circulating cylinder 2, and the second end of the ventilation pipe extends out of the fermentation tank body 1; the first end of the ventilation pipe opens downward and is connected to an air distribution head 6, the top of the air distribution head 6 is communicated with the first end of the ventilation pipe, the bottom of the air distribution head 6 is closed, and the bottom of the air distribution head 6 is located above the bottom opening of the circulating cylinder 2; the side wall of the air distribution head 6 is connected to the three-phase mixing rotator 3 through a horizontally arranged gas branch pipe, and the three-phase mixing rotator 3 is arranged above the bottom opening of the circulating cylinder 2, its feed port is communicated with the gas branch pipe, and the discharge port is located outside the circulating cylinder 2.

[0025] In this embodiment, the bottom of the circulation drum 2 is fixed to the inner bottom of the fermentation tank body 1 via a first support 4. The inner bottom of the fermentation tank body 1 is further provided with a second support 5 for fixedly supporting the three-phase mixing rotator 3. Specifically, the first support 4 is a T-shaped support, wherein the T-shaped support may include an annular reinforcement plate that matches the bottom of the circulation drum 2. The middle portion of the upper surface of the reinforcement plate may be provided with a fixing groove, and the bottom of the circulation drum 2 is fixed in the fixing groove. The bottom of the annular reinforcement plate is provided with a support column, and the bottom of the support column is fixed to the inner bottom wall of the fermentation tank body 1. The second support 5 may also adopt a similar T-shaped support, or an n-shaped support or other support structure that meets working requirements. The three-phase mixing rotator 3 is fixedly connected to the second support 5 via a fixing member 7, wherein the fixing member 7 includes a U-shaped bolt and a fixing plate. The three-phase mixing rotator 3 is clamped to the fixing plate using the U-shaped bolt, and the fixing plate is welded to the second support below. The fixing member 7 may adopt other structures as needed, such as a clamp.

[0026] In this embodiment, a plurality of gas branch pipes are provided on the side wall of the air distribution head 6, each of the gas branch pipes is connected to a three-phase mixing rotator 3, and the plurality of three-phase mixing rotators 3 are evenly distributed along the circumference of the lower edge of the circulation cylinder 2; the shaping size and positioning size of the circulation cylinder 2 are determined according to actual work needs.

[0027] In this embodiment, each of the three-phase mixing rotators 3 is provided with several discharge ports, preferably two of which are arranged horizontally and vertically connected to the three-phase mixing rotator 3; the opening directions of the discharge ports of the multiple three-phase mixing rotators 3 are generally distributed counterclockwise.

[0028] In this embodiment, the three-phase mixing rotator 3 comprises a cylindrical barrel. The feed port is provided at one end of the barrel and is located within the circulation barrel 2 for communication with the gas branch pipe. The discharge port is provided at the other end of the barrel and extends outside the circulation barrel 2. The wall of the circulation barrel 2 is provided with a through hole to facilitate the passage of the barrel of the three-phase mixing rotator 3. Furthermore, the feed port and discharge port of the three-phase mixing rotator 3 are both conical structures, with the small ends of the feed port and the small ends of the discharge port both located close to the barrel.

[0029] In this embodiment, the diameter of the gas branch pipe near one end of the three-phase mixing rotator 3 gradually decreases, and the gas branch pipe can be spliced together by multiple sections of pipelines, and the multiple sections of pipelines are connected by sealing flanges; the maximum diameter of the gas branch pipe is smaller than the minimum diameter of the feed port of the three-phase mixing rotator 3, and a gap is provided between the outer wall of the gas branch pipe and the inner wall of the feed port, so that the material in the circulation drum 2 can enter the three-phase mixing rotator 3 and be discharged from the discharge port; the end of the gas branch pipe near the feed port can be fixedly connected to the three-phase mixing rotator 3 by a bracket, a connecting rod and other connecting parts.

[0030] In this embodiment, the ventilation pipe is connected to a blower for ventilation. The air entering the ventilation pipe is distributed under pressure conditions and enters the three-phase mixing rotator 3, forming a three-phase uniform mixed liquid rotating upward outside the circulation drum 2. When it reaches the top of the circulation drum 2, it is deflected into the interior of the circulation drum 2 under the action of the fluid continuity characteristics and the density difference between the inside and the outside, and accelerates downward movement, so that the fermentation liquid inside the circulation drum 2 carries the gas and solids to move rapidly downward. Due to the large outside-to-inside flow ratio, the circulation drum 2 carries a large amount of bubbles and solids downward at high speed to form a complete cycle; the high-speed mixed liquid in the circulation drum 2 has a downward momentum, which pushes the fermentation liquid retained at the bottom of the tank to move to the outside of the circulation drum 2, and merges into the overall circulation with the carrying effect of the rising bubbles on the outside. In this embodiment, the entire tank realizes the engineering three-transmission and one-reverse conditions of directional, no stagnation area, high gas content, and high-speed rotating mixing, which fully meets the ventilation and fermentation conditions of various products in medium-sized fermentation tanks.

[0031] In this embodiment, a smaller circulation drum 2 is used, with directional circulation from outside to inside, meeting both the requirements of gas-liquid-solid three-phase circulation and mixing and the requirements of tank operation. A specially designed three-phase mixing rotator 3 is used in the lower part of the circulation drum 2, with a horizontal rotating layout. The gas-liquid-solid mixture rotates along the circulation drum 2 and diffuses upward. The high mass transfer area outside the circulation drum 2 maximizes the gas-liquid specific surface area, achieving a high volumetric oxygen transfer coefficient, fully meeting the bacterial cells' own large specific surface area's demand for environmental factors and nutrients.

[0032] In this embodiment, due to the density difference inside and outside the circulation drum 2 and the fluid continuity characteristics, a circulation flow is formed with the circulation drum 2 circulating upward outside and downward inside. The smaller internal and external flow ratio structure makes the downward flow velocity inside the circulation drum 2 large enough, pulling a certain proportion of high gas content liquid and solid to move downward. The high-speed downward flow impulse pushes the fermentation liquid retained at the bottom of the fermenter to the outside of the drum and, accompanied by the lifting effect of the rising bubbles, enters the external high mass transfer area, ensuring that there are no dead corners or retention areas in the entire tank.

[0033] The fermentation reactor design of the present invention achieves fermentation engineering characteristic parameters such as cycle time, circulation liquid velocity, mixing time, gas holdup, volume oxygen transfer coefficient, PecLet number, gas-liquid-solid three-phase uniformity, and dissolved oxygen rate that are superior to those of traditional medium-sized mechanically ventilated fermentation reactors.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A medium-sized high mass transfer circulating ventilated fermenter, comprising a fermenter body, wherein the fermenter body is provided with a cooling jet pipe; characterized in that: A circulation drum is also fixedly provided in the fermentation tank body, and the top and bottom of the circulation drum are both open; the bottom of the circulation drum is also connected to a ventilation pipe, the first end of the ventilation pipe is arranged at the bottom of the circulation drum, the second end of the ventilation pipe extends out of the fermentation tank body and is connected to a fan; the first end of the ventilation pipe opens downward and is connected to an air distribution head, the bottom of the air distribution head is located above the bottom opening of the circulation drum, the top of the air distribution head is communicated with the first end of the ventilation pipe, the bottom of the air distribution head is closed, and the side wall of the air distribution head is open. A three-phase mixing rotator is connected to the gas branch pipe, the feed port of the three-phase mixing rotator is located in the circulation cylinder and is connected to the gas branch pipe, and the discharge port of the three-phase mixing rotator is located outside the circulation cylinder; a plurality of the gas branch pipes are provided on the side wall of the air distribution head, each of the gas branch pipes is connected to a three-phase mixing rotator, and the plurality of three-phase mixing rotators are evenly distributed along the circumference; the discharge port opening directions of the plurality of the three-phase mixing rotators are distributed counterclockwise as a whole; a gap is provided between the outer wall of the gas branch pipe and the inner wall of the feed port.

2. The medium-sized high mass transfer circulating ventilated fermenter according to claim 1, characterized in that: The bottom of the circulation drum is fixed to the inner bottom of the fermentation tank body through a first support. The inner bottom of the fermentation tank body is also provided with a second support for supporting the three-phase mixing rotor.

3. The medium-sized high mass transfer circulating ventilated fermenter according to claim 2, characterized in that: The first support is a T-shaped support, the second support is an N-shaped support, and the three-phase hybrid rotator is fixedly connected to the second support via a fixing member.

4. The medium-sized high mass transfer circulating ventilated fermenter according to claim 1, characterized in that: Each of the three-phase mixing rotators is provided with a plurality of discharge ports, which are arranged horizontally and vertically connected to the three-phase mixing rotator.

5. The medium-sized high mass transfer circulating ventilated fermenter according to claim 1, characterized in that: The three-phase mixing rotator includes a cylindrical barrel, one end of which is provided with the feed port and is located in the circulation barrel for communicating with the gas branch pipe, and the other end of the barrel is provided with the discharge port and extends out of the circulation barrel.

6. The medium-sized high mass transfer circulating ventilated fermenter according to claim 5, characterized in that: The feed port and the discharge port of the three-phase mixing rotator are both conical structures, and the small end of the feed port and the small end of the discharge port are both arranged close to the cylinder.

7. The medium-sized high mass transfer circulating ventilated fermenter according to claim 6, characterized in that: The diameter of the gas branch pipe at one end close to the three-phase mixing rotor gradually decreases, and the diameter of the gas branch pipe is smaller than the diameter of the feed port of the three-phase mixing rotor.

Images