Special mechanical impact type gas-liquid-solid three-phase mixer for fermentation tank

Abstract

The utility model discloses a special mechanical impact type gas-liquid-solid three-phase mixer for a fermentation tank, and relates to the technical field of mixers. The device comprises a liquid inlet, a mixing pipe, a diffusion pipe and a mechanical impactor, the fixed rib plate is arranged around the periphery of the liquid inlet, the air inlet pipe extends into the liquid inlet, and a conical nozzle is arranged at the front end of the air inlet pipe; the mechanical impactor comprises a vertical rod, a plurality of first cross-shaped piles vertically arranged on the peripheral side of the vertical rod at intervals and second cross-shaped piles arranged at the top of the vertical rod. According to the technical scheme, compressed air passes through the conical nozzle and flows at a high speed to convert static pressure into kinetic energy, and high-speed airflow impacts fermentation liquor to achieve primary breaking of bubbles; after entering the mixing pipe, the three-phase flow is torn under the constraint condition, and double breaking of bubbles is completed; the three-phase flow is subjected to multiple crushing through the mechanical impactor; and the mixture with broken bubbles flows through the outlet of the diffusion pipe to complete sufficient power transmission with the fermentation liquor which does not pass through the three-phase mixer, so that the energy consumption corresponding to stirring is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mixers, in particular to a mechanical impact type gas-liquid-solid three-phase mixer special for a fermentation tank. Background Art

[0002] Almost all domestic fermentation industries such as antibiotics, vitamins, amino acids, and organic acids use ventilated stirred reactors for industrial production. Fermentation equipment has always had the problem of large energy waste in the fermentation process, high energy consumption, and low ventilation utilization rate.

[0003] Restricted by engineering level, traditional stirred aeration fermentation reactors have significantly restricted the progress of fermentation. With the development of engineered bacteria and the advancement of synthetic biology, aeration fermentation characterized by high-density fermentation of Escherichia coli, Bacillus subtilis and yeast has higher and higher requirements for engineering level, and traditional stirred aeration reactors are becoming more and more constrained.

[0004] In the practical promotion of various products of fermentation tanks, the general ventilation fermentation tank stirring system has multiple layers of blades, and the bottom blades are turbine radial flow stirring. The energy consumption of the bottom radial flow stirring is generally designed to account for 60% of the total stirring power. The middle and upper parts are multi-layer open axial flow mixed slurry, and the energy consumption of stirring is relatively high. This technical solution provides a mechanical impact gas-liquid-solid three-phase mixer specially designed for fermentation tanks, which can replace the original bottom radial flow stirring and achieve huge energy-saving effects. Utility Model Content

[0005] The utility model provides a mechanical impact gas-liquid-solid three-phase mixer specially used for a fermentation tank, which is composed of a liquid inlet, a mixing tube, a diffusion tube and a mechanical impactor installed in the mixing tube, wherein the mechanical impactor comprises a vertical rod and a first cross pile and a second cross pile arranged vertically around; compressed air passes through a conical nozzle at a high speed flow to convert static pressure into kinetic energy, and the high-speed airflow impacts the fermentation liquid to achieve a single-stage crushing of bubbles; after the three-phase flow enters the mixing tube, it is torn under constraint conditions to complete a double-stage crushing of the bubbles; the three-phase flow passes through the mechanical impactor to complete multiple crushing; the mixed flow that completes the bubble crushing passes through the outlet of the diffusion tube to complete the full power transmission with the fermentation liquid that has not passed through the three-phase mixer; the above structure can maximize the flux and minimize the energy loss under the condition of fully satisfying the shear stress, and greatly reduce the energy consumption corresponding to stirring; in summary, the problems in the background technology are solved.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model discloses a mechanical impact type gas-liquid-solid three-phase mixer specially used for a fermentation tank, comprising a contracted liquid inlet, a mixing tube connected to the smaller diameter end of the liquid inlet, a diffusion tube connected to the end of the mixing tube, an air inlet tube fixedly installed by a fixed rib plate, and a mechanical impactor installed in the mixing tube;

[0008] The fixed ribs are arranged around the liquid inlet, the air inlet pipe extends into the liquid inlet and a conical nozzle is arranged at the front end;

[0009] The mechanical impactor includes a vertical rod, a plurality of first cross piles arranged at vertical intervals around the vertical rod, and a second cross pile arranged at the top of the vertical rod; the second cross pile is welded and fixed to the side wall of the mixing tube end, and the first cross pile is spaced from the side wall of the mixing tube.

[0010] Furthermore, the diffuser, mixing tube, vertical rod, liquid inlet and air inlet pipe are coaxially arranged.

[0011] Furthermore, each of the first cross piles and the second cross piles is centered on the vertical rod and is arranged in a staggered manner when viewed from a top view.

[0012] Furthermore, the mixing tube is a tube of equal diameter; the small diameter end of the diffusion tube and the small diameter end of the liquid inlet have the same diameter as the mixing tube.

[0013] Furthermore, the diffuser tube adopts an outward-expanding conical structure.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The gas-liquid-solid three-phase mixer is composed of a liquid inlet, a mixing tube, a diffusion tube, and a mechanical impactor installed in the mixing tube, wherein the mechanical impactor includes a vertical rod and a first cross pile and a second cross pile arranged vertically around the vertical rod; the compressed air flows through a conical nozzle at a high speed to convert static pressure into kinetic energy, and the high-speed airflow impacts the fermentation liquid to achieve a first-level breakage of bubbles;

[0016] (2) After the three-phase flow enters the mixing tube, it is torn under constraint conditions to complete the double breakage of the bubbles; the three-phase flow passes through the mechanical impactor to complete multiple breakage;

[0017] (3) The mixed flow after bubble crushing passes through the outlet of the diffusion tube, completing the full power transfer with the fermentation liquid that has not passed through the three-phase mixer;

[0018] (4) The structure of this technology can maximize the flux and minimize the energy loss under the condition of fully satisfying the shear stress, which greatly reduces the energy consumption corresponding to stirring.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a structural schematic diagram of a mechanical impact type gas-liquid-solid three-phase mixer specially used for a fermentation tank of the utility model;

[0022] Figure 2 for Figure 1 A top view of the structure;

[0023] Figure 3 for Figure 1 Bottom view of the structure;

[0024] Figure 4 for Figure 1 Middle aa section view;

[0025] Figure 5 for Figure 1 Schematic diagram of the structure of the mixing tube;

[0026] Figure 6 for Figure 1 Schematic diagram of the structure of the mechanical impactor;

[0027] Figure 7 for Figure 1 Schematic diagram of the structure of the fixed rib plate;

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1-air inlet pipe, 11-conical nozzle, 12-fixed rib plate, 2-liquid inlet, 3-mixing tube, 4-mechanical impactor, 41-vertical rod, 42-first cross pile, 43-second cross pile, 5-diffuser. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it is necessary to understand that terms such as "inside", "one end", "surrounding", "front end", "side wall", "axis", "interlaced arrangement" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Almost all domestic fermentation industries such as antibiotics, vitamins, amino acids, and organic acids use universal ventilation stirring reactor technology for industrial product production. The domestic large-scale fermentation industry has been in operation for more than 60 years, but there has been no major breakthrough in fermentation equipment. The fermentation process has always been characterized by large energy waste, high energy consumption, and low ventilation oxygen utilization.

[0033] In recent years, with the progress in the strains and processes of various fermentation products, the fermentation level has been greatly improved; there have been certain breakthroughs at the molecular and cellular levels, but due to the constraints of engineering level, the traditional stirred and ventilated fermentation reactor has obviously restricted the progress of fermentation; with the development of engineered bacteria and the progress of synthetic biology, the ventilation fermentation characterized by high-density fermentation of Escherichia coli, Bacillus subtilis and yeast has higher and higher requirements on the engineering level, and the traditional stirred and ventilated reactor is becoming more and more constrained.

[0034] The key technology of the fermentation tank is to control ventilation, among which the mixer is the key component to control ventilation. It is necessary to continuously develop new three-phase mixers with new suitability according to the differences in shear stress requirements of different bacterial genera of different fermentation products to achieve the de-agitation of the fermentation reactor. This technical solution proposes a mechanical impact gas-liquid-solid three-phase mixer and completes series standardization. This series of three-phase mixers has the mixing and mass transfer characteristics of intense impact shear and is suitable for bacterial fermentation.

[0035] In the ventilated aerobic fermentation industry, the general ventilated fermentation tank stirring system has multiple layers of blades, and the bottom blades are turbine radial flow stirring. The bottom radial flow stirring energy consumption is generally designed to account for 60% of the total stirring power, and the middle and upper parts are multi-layer open axial flow mixed slurry; the high mass transfer circulating fermenter and self-mixing circulating fermenter developed by our company are both non-stirring energy-saving fermenters, and the gas-liquid-solid three-phase mixer replaces the bottom radial flow stirring to achieve huge energy-saving effects.

[0036] See also Figure 1-7 As shown, the utility model is a mechanical impact type gas-liquid-solid three-phase mixer specially used for a fermentation tank, comprising a contracted liquid inlet 2, a mixing tube 3 connected to the smaller diameter end of the liquid inlet 2, a diffusion tube 5 connected to the end of the mixing tube 3, an air inlet pipe 1 fixedly installed by a fixed rib plate 12, and a mechanical impactor 4 installed in the mixing tube 3;

[0037] The fixed ribs 12 are arranged around the liquid inlet 2, the air inlet pipe 1 extends into the liquid inlet 2 and a conical nozzle 11 is arranged at the front end;

[0038] The mechanical impactor 4 includes a vertical rod 41, a plurality of first cross piles 42 arranged at vertical intervals around the vertical rod 41, and a second cross pile 43 arranged at the top of the vertical rod 41; the second cross pile 43 is welded and fixed to the side wall of the end of the mixing tube 3, and a spacing is set between the first cross pile 42 and the side wall of the mixing tube 3; in this specific embodiment, the fixed ribs 12 are specifically arranged in a surrounding manner, and the corresponding first cross piles 42 are arranged in nine equal intervals.

[0039] The diffuser 5, the mixing tube 3, the vertical rod 41, the liquid inlet 2 and the air inlet pipe 1 are coaxially arranged.

[0040] The first cross piles 42 and the second cross piles 43 are centered on the vertical rod 41 and are arranged in a staggered manner when viewed from a top view.

[0041] The mixing tube 3 is a tube of equal diameter; the small diameter end of the diffusion tube 5 and the small diameter end of the liquid inlet 2 have the same diameter as the mixing tube 3 .

[0042] The diffuser 5 has an outward-expanding conical structure.

[0043] The specific application of this technical solution is:

[0044] According to the basic information parameters of the fermentation product, the three-phase mixer design calculation is completed, the quantity and specifications are determined, and the layout is arranged on the air inlet pipe network at the bottom of the fermentation tank; the mechanical impact gas-liquid-solid three-phase mixer is divided into a mixer air inlet pipe, a conical nozzle, a mixer liquid inlet reducer, a mixing tube, a mechanical impactor, and a diffusion tube;

[0045] A special nozzle is welded to the air inlet pipe of the mixer. The air inlet pipe and the liquid inlet reducer are positioned using a special positioning mold and welded together with fixed-size ribs. The liquid inlet reducer is connected to the mixing pipe. 5-20 groups of cross piles are added to the rear half of the mixing pipe (to complete 1-4 cross-section coverage), and the last group is welded to the tail of the mixing pipe, and then the mixing pipe is connected to the diffuser; specifically 9 groups in this specific embodiment.

[0046] The mixer is placed at the bottom of the fermentation tank and immersed in the deep liquid and solid. Air enters from the air inlet pipe of the mixer and flows through the nozzle at high speed, realizing the conversion of static pressure energy into kinetic energy and forming a negative pressure area. The pressure difference presses the fermentation liquid from the mixer's liquid inlet reducer into the mixer, and homogeneous mixing is completed in the front section of the mixing tube. The mixed liquid flows through the mechanical impactor at high speed to complete the bubble fragmentation and enters the diffusion tube to complete diffusion.

[0047] With the development of engineered bacteria and the progress of synthetic biology, aeration fermentation characterized by high-density fermentation of Escherichia coli, Bacillus subtilis and yeast has higher and higher requirements for engineering level, and traditional stirred aeration reactors are increasingly constrained. It is imperative to further reduce the bubble size, increase the gas content of the fermentation liquid, improve the mass transfer efficiency KLa, and increase the oxygen supply capacity OTR.

[0048] The mechanical impact gas-liquid-solid three-phase mixer specially designed for fermentation is designed to meet the needs of fermentation engineering bacteria with high-intensity metabolism. 5-20 groups (each 5 groups is a module) of cross piles are installed in the mixing tube to maximize the flux (minimize energy loss) while fully meeting the shear stress.

[0049] Basic principle of mixer:

[0050] 1. The compressed air flows through the nozzle at high speed, converting the static pressure energy into kinetic energy. The high-speed airflow impacts the fermentation liquid, achieving the first level of bubble breaking;

[0051] 2. The three-phase flow enters the mixing tube and is torn under constraint conditions to complete the double breakage of bubbles;

[0052] 3. The three-phase flow passes through the mechanical impactor to complete multiple crushing;

[0053] 4. The mixed flow after bubble crushing passes through the outlet of the diffusion tube, completing the full momentum transfer with the fermentation liquid that has not passed through the three-phase mixer.

[0054] In the experimental tank device, under the conditions of constant air volume, constant temperature and constant pressure, the sodium sulfite solution oxidation experiment was carried out to determine the mixer performance; DO (dissolved oxygen) and tail gas oxygen concentration were continuously determined, and the continuous characteristic curve of the linear pressurized gas-liquid-solid three-phase mixer was drawn, as well as curves such as KLa, OTR (oxygen supply), DO, tail gas oxygen concentration, sodium sulfite consumption rate and oxygen utilization rate; liquid-gas ratio detection was completed on a special liquid-gas ratio detection device, and gas content detection was completed on a gas content experimental device. The biggest feature is the strong shear stress and a certain stress adjustment range, which can meet the fermentation oxygen demand of bacterial engineering bacteria and further expand the scope of use of fermentation products without mechanical stirring.

[0055] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A mechanical impact gas-liquid-solid three-phase mixer for a fermentation tank, characterized in that: It comprises a contracted liquid inlet (2), a mixing tube (3) connected to the end of the liquid inlet (2) with a smaller diameter, a diffusion tube (5) connected to the end of the mixing tube (3), an air inlet tube (1) fixedly installed by a fixed rib plate (12), and a mechanical impactor (4) installed in the mixing tube (3); The fixed rib plate (12) is arranged around the liquid inlet (2), the air inlet pipe (1) extends into the liquid inlet (2) and a conical nozzle (11) is provided at the front end; The mechanical impactor (4) comprises a vertical rod (41), a plurality of first cross piles (42) arranged at vertical intervals around the vertical rod (41), and a second cross pile (43) arranged at the top of the vertical rod (41); the second cross pile (43) is welded and fixed to the side wall of the end of the mixing tube (3), and a spacing is provided between the first cross pile (42) and the side wall of the mixing tube (3).

2. The mechanical impact gas-liquid-solid three-phase mixer for fermentation tank according to claim 1, characterized in that: The diffusion tube (5), the mixing tube (3), the vertical rod (41), the liquid inlet (2) and the air inlet tube (1) are arranged coaxially.

3. The mechanical impact gas-liquid-solid three-phase mixer for fermentation tank according to claim 1, characterized in that: Each of the first cross piles (42) and the second cross piles (43) is centered on the vertical rod (41) and is arranged in a staggered manner when viewed from a top view.

4. The mechanical impact gas-liquid-solid three-phase mixer for fermentation tank according to claim 1, characterized in that: The mixing tube (3) is a tube of equal diameter; the small diameter end of the diffusion tube (5) and the small diameter end of the liquid inlet (2) have the same diameter as the mixing tube (3).

5. The mechanical impact gas-liquid-solid three-phase mixer for fermentation tank according to claim 1, characterized in that: The diffusion pipe (5) adopts an outward-expanding conical structure.

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