An anaerobic fermentation system based on enhanced gas nozzle

Abstract

The invention discloses an anaerobic fermentation system based on a synergistic gas nozzle, wherein the synergistic gas nozzle comprises a main pipe section, a reduced diameter section, a throat section and an expanded section connected in sequence. The synergistic gas nozzle of the invention can enable the gas at the inlet to obtain a greater gas flow rate after passing through the synergistic gas nozzle, thereby effectively improving the stirring and mixing ability of the materials in the anaerobic fermentation tank and reducing energy consumption. Moreover, through the reasonable assembly of the synergistic gas nozzle and the anaerobic fermentation tank, the operation and maintenance interval of the high-solid / dry anaerobic project can be extended, and the tank cleaning time during maintenance can be shortened. The high-efficiency gas stirring device of the invention can be used for the material stirring process of the high-solid and dry anaerobic fermentation tanks during operation, thereby promoting the uniform mixing of high-concentration materials in the anaerobic fermentation tank, preventing stratification, and facilitating the restart of the anaerobic fermentation tank that has been shut down. Compared with mechanical stirring and previous gas stirring devices, the anaerobic fermentation system is economical, efficient and highly applicable.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental engineering solid waste disposal and resource utilization, in particular to an anaerobic fermentation system based on a synergistic gas nozzle. Background Art

[0002] High-solid / dry anaerobic fermentation is increasingly being used to treat organic solid wastes such as livestock and poultry waste and kitchen waste in economically developed markets such as Europe due to its advantages over wet anaerobic digestion processes, such as strong processing load, high volumetric gas production rate, water conservation, small or no biogas liquid discharge, simple post-treatment and low operating costs. In recent years, dry anaerobic fermentation technology has also been increasingly used in China to alleviate the contradiction between resource utilization policy needs and the gap in processing capacity for organic solid wastes such as domestic waste.

[0003] In anaerobic processes, especially high-solid / dry anaerobic fermentation processes with high solid content, material stirring is a key factor in anaerobic gas production efficiency. Stirring directly determines the uniformity of material distribution, which in turn affects the contact between anaerobic microorganisms and materials and affects the biochemical process. It also produces positive and negative feedback on the heat transfer and mass transfer of materials. In engineering practice, it has been found that compared with traditional mechanical stirring, anaerobic fermentation with higher solid organic waste content (high solid / dry) is more suitable for gas stirring. The reflux biogas is pressurized and then fed into the dry anaerobic fermentation tank to stir and disturb the anaerobic material and prevent stratification caused by material sedimentation. At the same time, it is very important to use a gas stirring device, so that there are no mechanical parts inside the anaerobic tank, which solves the problems of high energy consumption, high wear and tear, and high failure rate of traditional mechanical stirring. However, the current biogas mixing system's structural design is still insufficient. The outlet nozzle of the biogas delivery pipe extends deep into the interior of the anaerobic tank and protrudes a certain distance from the bottom surface of the tank. As a result, the pressurized gas cannot effectively blow away the material around the protruding pipe. This causes material to easily accumulate in this area, which will reduce the effective volume of the tank after long-term operation. For the cleaning and maintenance of accumulated materials, the dense protruding nozzles on the bottom of the tank cannot be used by mechanical vehicles, and manual cleaning is required. This greatly prolongs the cleaning and maintenance time, resulting in excessive downtime and hindering stable operation and commissioning. Therefore, it is necessary to optimize the biogas mixing system of dry anaerobic systems to solve the problem of heavy material accumulation around the protruding nozzle and improve mixing efficiency. Summary of the Invention

[0004] In view of this, the main purpose of the present invention is to provide an anaerobic fermentation system based on a synergistic gas nozzle, in order to at least partially solve at least one of the above-mentioned technical problems.

[0005] As one aspect of the present invention, a gas enhancement nozzle is provided, comprising a main pipe section, a reduced diameter section, a throat section and an expansion section connected in sequence, wherein:

[0006] A main pipe section, wherein the free end of the main pipe section is configured as an air inlet;

[0007] A reduced diameter section, wherein both ends of the reduced diameter section are connected to the main pipe section and the throat pipe section respectively, and the inner diameter of the reduced diameter section gradually decreases from the main pipe section to the throat pipe section, and is used to accelerate the transported gas;

[0008] a throat section, wherein both ends of the throat section are connected to the reduced diameter section and the expanded section respectively;

[0009] The expansion section has a free end configured as an air outlet, and the inner diameter of the expansion section gradually increases from the throat section toward the free end of the expansion section, for diffusing and spraying the transported gas.

[0010] As another aspect of the present invention, an anaerobic fermentation tank is also provided, comprising:

[0011] Tank;

[0012] As for the above-mentioned booster gas nozzle, the gas outlet end of the booster gas nozzle is flush with and communicated with the bottom of the tank body; and the booster gas nozzle is arranged at an angle to the horizontal plane.

[0013] As another aspect of the present invention, there is also provided an anaerobic fermentation system, comprising:

[0014] The anaerobic fermentation tank as described above is used for anaerobic fermentation;

[0015] The pressure reserve unit is used to store the accumulated pressure of the gas, store energy for gas injection, and deliver the accelerating gas to the tank through the synergistic gas nozzle to achieve stirring of the material in the tank;

[0016] A monitoring unit, configured to measure the pressure value of the pressure reserve unit in real time;

[0017] The control unit is used to obtain and analyze the pressure value measured by the monitoring unit and control the operation of the pressure reserve unit.

[0018] As another aspect of the present invention, there is also provided an application of the above-mentioned enhanced gas nozzle in the field of wet, dry or high-solid anaerobic fermentation.

[0019] Based on the above technical solution, the present invention has at least one or part of the following beneficial effects compared to the prior art:

[0020] (1) The synergistic gas nozzle of the present invention adopts the overall coordination of the main pipe section, the reduced diameter section, the throat section and the expansion section. The reduced diameter section is used to accelerate the gas transported by the main pipe section, kinetic energy is accumulated in the throat section, and diffuse injection is achieved in the expansion section, which is conducive to obtaining an enhanced outlet gas velocity, thereby utilizing the accelerated gas to stir the material. It is suitable for stirring and mixing high-solid organic anaerobic materials, has high energy utilization, replaces the mechanical stirring method, and makes the structure inside the anaerobic fermentation tank simpler.

[0021] (2) The present invention designs the outlet end of the synergistic gas nozzle to be flush with the bottom of the tank, thereby reducing the low-speed area around the traditional biogas agitation nozzle, thereby reducing the deposition of anaerobic materials in the area around the nozzle, which is conducive to maintaining the effective reaction volume;

[0022] (3) The anaerobic fermentation tank designed by the present invention has a simple structure and is easy to maintain. It is simple to operate and maintain, requires little manpower, and is easy to realize automatic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the enhanced gas nozzle according to Example 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of a high-efficiency gas stirring device of an anaerobic fermentation system according to Example 3 of the present invention;

[0025] Figure 3A This is a schematic diagram of the installation status of the traditional configuration nozzle;

[0026] Figure 3B This is a schematic diagram of the first improved nozzle installation status;

[0027] Figure 3C This is a schematic diagram of the second improved nozzle installation state;

[0028] Figure 3D This is a schematic diagram of the installation state of the booster gas nozzle in Example 1 of the present invention;

[0029] Figure 4 for Figures 3A-3D Liquid phase velocity cloud diagrams and vector diagrams at 6 s corresponding to different configuration nozzles based on numerical simulation results; among them, A is a traditional configuration nozzle; B is the first improved nozzle; C is the second improved nozzle; D is the enhanced gas nozzle of Example 1 of the present invention.

[0030] In the above drawings, the meanings of the reference numerals are as follows:

[0031] 1. Enhanced gas nozzle; 2. Gas pressure storage tank; 3. Gas pressure sensor; 4. Anaerobic aeration control system; 5. Branch pipe; 11. Main pipe section; 12. Reduced diameter section; 13. Throat section; 14. Expanded section; 15. Air inlet; 16. Air outlet. DETAILED DESCRIPTION

[0032] The present invention is applicable to a stirring device for efficient mixing and contacting of materials in an anaerobic biological fermentation process, and specifically relates to an anaerobic fermentation resource treatment process for urban domestic garbage, kitchen waste, sludge, livestock and poultry manure, etc.; the invented synergistic gas nozzle stirring device is used to achieve efficient mixing of materials, and is particularly suitable for high-solid and dry anaerobic fermentation tanks. The synergistic gas nozzle of the present invention can enable the inlet gas to obtain a greater gas flow rate after passing through the synergistic gas nozzle, which can effectively improve the stirring and mixing ability of the materials in the anaerobic fermentation tank, reduce energy consumption, and through the reasonable assembly of the synergistic gas nozzle and the anaerobic fermentation tank, it is possible to extend the operation and maintenance interval of the high-solid / dry anaerobic project, and also shorten the tank cleaning time during maintenance. The synergistic gas nozzle of the present invention can be used for the material stirring process of high-solid and dry anaerobic fermentation tanks during operation, promote the uniform mixing of high-concentration materials in the tank body, prevent stratification, and facilitate the restart of the shut-down anaerobic fermentation tank. Compared with mechanical stirring and previous gas stirring devices, it has the characteristics of economy, high efficiency, and strong applicability.

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0034] Example 1

[0035] In a first exemplary embodiment of the present invention, a booster gas nozzle is provided, such as Figure 1 As shown, the booster gas nozzle 1 comprises a main pipe section 11, a reduced diameter section 12, a throat section 13 and an expansion section 14 connected in sequence, wherein:

[0036] A main pipe section 11, a free end of which is configured as an air inlet 15;

[0037] The reduced diameter section 12 has two ends connected to the main pipe section 11 and the throat pipe section 13 respectively. The inner diameter of the reduced diameter section 12 gradually decreases from the main pipe section 11 to the throat pipe section 13, and is used to accelerate the transported gas;

[0038] The throat section 13 has two ends connected to the reduced diameter section 12 and the expanded section 14 respectively;

[0039] The expansion section 14 has a free end configured as an air outlet 16 , and the inner diameter of the expansion section 14 gradually increases from the throat section 13 toward the free end of the expansion section 14 , for diffusing and spraying the transported gas.

[0040] More specifically, in an embodiment of the present invention, the booster gas nozzle 1 is generally a long straight pipe (i.e., the main pipe section), the air inlet 15 is at the bottom of the booster gas nozzle 1, and the air inlet 15 is connected to the gas pressure storage tank 2 through the branch pipe 5 and the main pipe in sequence; the air outlet 16 is at the top of the booster gas nozzle 1.

[0041] In engineering, the anaerobic fermentation tank is large in scale and has a large amount of material. Considering the volume of the gas pressure storage tank 2 and the large gas acceleration rate that can be obtained, the diameter of the main section 11 of the synergistic gas nozzle 1 is designed to be 10mm to 60mm. On the one hand, if the diameter of the synergistic gas nozzle 1 is too large, the pressure requirement for the gas inlet will be higher under the same injection gas speed, and the requirements for the gas pressure storage tank 2 will be higher, the cost will be high, and there will be greater risks in terms of safety. On the other hand, the setting of the small pipe mouth makes it difficult for the material in the tank or large particles to flow back along the synergistic gas nozzle 1 and damage the gas stirring device.

[0042] In the embodiment of the present invention, the taper of the reduced diameter section 12 of the booster gas nozzle 1 is 1:1 to 1:2.2, and the taper of the expanded section 14 is 1:3 to 1:8. The tapers of the reduced diameter section 12 and the expanded section 14 are not limited thereto, as long as the reduced diameter section 23 gradually decreases in inner diameter, thereby accelerating the transported gas and providing a greater kinetic energy effect; and the gas ejected from the expanded section 14 through the gas outlet 16 has a higher gas velocity than that of the gas inlet 15, thereby promoting the stirring and mixing of the materials in the anaerobic fermentation tank, and also blowing upward the denser materials deposited at the bottom to prevent them from further settling.

[0043] In the embodiment of the present invention, the length to diameter ratio of the throat section 13 is 0.8 to 1.4, but is not limited thereto, as long as the pressure of the booster gas nozzle 1 is maximum in the throat section 13 and the energy is accumulated.

[0044] In an embodiment of the present invention, the material of the booster gas nozzle 1 includes stainless steel or pressure-resistant engineering plastic.

[0045] In addition, the enhanced gas nozzle 1 of Example 1 of the present invention is compared with the conventional configuration A, the first improved nozzle B, and the second improved nozzle C; Figure 3A This is a schematic diagram of the installation state of the original configuration nozzle of the prior art; Figure 3B This is a schematic diagram of the first improved nozzle installation status; Figure 3C This is a schematic diagram of the second improved nozzle installation state; Figure 3D This is a schematic diagram of the installation state of the booster gas nozzle in Example 1 of the present invention; Figure 4 for Figures 3A-3D Liquid phase velocity cloud diagram and vector diagram at 6s corresponding to different configuration nozzles based on numerical simulation results.

[0046] Among them, Figure 3AThe figure shows a traditional nozzle configuration. The traditional nozzle configuration is a straight pipe with the outlet nozzle extending deep into the interior of the anaerobic fermentation tank and protruding a certain distance from the bottom surface of the tank. Problems with this design include: the material around the protruding pipe cannot be blown up well by the pressurized gas, causing the material to easily accumulate in this area, which will reduce the effective volume of the tank after long-term operation; and this design is not conducive to the use of mechanical vehicles for tank cleaning and maintenance.

[0047] like Figure 3B As shown in FIG, the first improved nozzle is subjected to a diameter reduction treatment at the outlet, and the outlet of the nozzle is flush with the bottom surface of the anaerobic fermentation tank; Figure 3C As shown in FIG, the second improved nozzle has a straight section between the reduced diameter section and the outlet end; Figure 3D The figure shows the enhanced gas nozzle 1 in embodiment 1 of the present invention.

[0048] The disturbance effect on the liquid phase caused by injecting gas with an inlet velocity of 10 m / s for 6 s from nozzles of various configurations was characterized. The gas transferred kinetic energy to the liquid phase, e.g. Figure 4 As shown in the figure, the color depth represents the distribution cloud of the velocity (the darker the area, the lower the velocity, the lighter the area, the higher the velocity). The gas ejected from the nozzles of the first improved type B and the second improved type C has a small disturbance on the liquid phase, and the velocity of most liquid phases is less than 3m / s. The enhanced gas nozzle 1 ( Figure 4 D), the ejected gas has the largest disturbance area on the liquid phase, and the highest liquid phase velocity reaches 7m / s; the arrow at the gas outlet is the expression of the velocity vector, indicating the magnitude and direction respectively, Figure 4 As shown, the original configuration nozzle has a duct portion protruding from the ground, with a large upward velocity component, generating upward disturbance kinetic energy; the first improved nozzle is reduced in diameter, and the outlet velocity is increased but the airflow is more dispersed; the second improved nozzle adds a straight section, which increases the speed, but the disturbance in the vertical and horizontal velocity components is not as good as the enhanced gas nozzle 1 of Example 1 of the present invention.

[0049] In summary, the synergistic gas nozzle 1 of the present invention can enable the inlet gas to obtain a greater gas flow rate after passing through the synergistic gas nozzle 1, which can effectively improve the stirring and mixing ability of the materials in the anaerobic fermentation tank, reduce energy consumption, and through the reasonable assembly of the synergistic gas nozzle 1 and the anaerobic fermentation tank, it is possible to extend the operation and maintenance interval of the high-solid / dry anaerobic project, and also shorten the tank cleaning time during maintenance. The synergistic gas nozzle 1 of the present invention can be used for the material stirring process of high-solid and dry anaerobic fermentation tanks during operation, promote the uniform mixing of high-concentration materials in the tank body, prevent stratification, and facilitate the restart of the anaerobic fermentation tank that has been shut down. Compared with mechanical stirring and previous gas stirring devices, it has the characteristics of economy, efficiency, and strong applicability.

[0050] This concludes the introduction of the first exemplary embodiment of the booster gas nozzle of the present invention.

[0051] Example 2

[0052] In a second exemplary embodiment of the present invention, as one aspect of the present invention, an anaerobic fermentation tank is further provided, the anaerobic fermentation tank comprising:

[0053] Tank;

[0054] As in the above-mentioned booster gas nozzle 1 , the end of the gas outlet 16 of the booster gas nozzle 1 is flush with and communicates with the bottom of the tank; and the booster gas nozzle 1 is arranged at an angle to the horizontal plane.

[0055] More specifically, in order to implement the gas stirring of the present invention efficiently, as Figure 3D As shown, the synergistic gas nozzle 1 needs to be assembled with the anaerobic fermentation tank. The synergistic gas nozzle 1 is connected to the bottom of the anaerobic fermentation tank, and the upper part of the synergistic gas nozzle 1 is embedded in the bottom of the fermentation tank. The gas outlet 16 of the synergistic gas nozzle 1 is flush with the inner surface of the bottom of the anaerobic fermentation tank; along the advancing direction of the anaerobic fermentation material, the gas outlet 16 is oriented at an angle to the horizontal plane, and the angle is an acute angle. The specific angle is adjusted according to the setting position and actual function; the air inlet 15 of the synergistic gas nozzle 1 is connected to the branch pipe 5 or the main pipe with a hose to achieve angle adjustment.

[0056] Among them, in the embodiment of the present invention, the synergistic gas nozzle pipe 1 of the present invention does not protrude from the bottom surface of the tank body. After the dry anaerobic fermentation has been running for a long time, it becomes possible to use a mechanical vehicle to clean the sludge at the bottom of the tank instead of the original manual dredging, thereby improving the dredging efficiency and reducing the dredging time from more than 30 days to a few days, greatly shortening the downtime and maintenance time, and being conducive to maintaining the stable working conditions of the dry anaerobic fermentation.

[0057] In the embodiment of the present invention, the multiple enhancement gas nozzles 1 are divided into multiple aeration groups, and the multiple aeration groups are respectively arranged at different positions of the tank body;

[0058] There are 5 to 12 aeration groups arranged in the tank body; each aeration group includes 2 to 20 enhancement gas nozzles.

[0059] More specifically, in an embodiment of the present invention, the high-solids / dry anaerobic fermentation tank has a high solids content, making mixing difficult and requiring a lot of power. The booster gas nozzles 1 are grouped and batched to inject gas into the fermentation tank materials to meet the material mixing requirements. Multiple booster gas nozzles 1 are arranged in a regular pattern at the bottom of the anaerobic fermentation tank. Two to twenty booster gas nozzles 1 are arranged into a number (5 to 12) aeration groups, depending on the area of ​​the anaerobic fermentation tank in which they are located.

[0060] In an embodiment of the present invention, the aeration group includes a first aeration group, a second aeration group, and a third aeration group;

[0061] The booster gas nozzle 1 of the first aeration group is arranged at the feed inlet of the tank body and / or at the far end of the feed inlet close to the tank wall. The booster gas nozzle 1 of the first aeration group is arranged at an angle of 75° to 85° with the horizontal plane (along the direction of material propulsion) to prevent the material from settling at the feed inlet and / or the wall of the tank body;

[0062] More specifically, in the embodiment of the present invention, the enhancement gas nozzle 1 of the first aeration group may be arranged at an angle of 85° to the horizontal plane.

[0063] The second aeration group is provided with multiple, and the synergistic gas nozzles of each aeration group are arranged in an array or symmetrical arrangement in the main anaerobic fermentation reaction zone of the tank body. The synergistic gas nozzle 1 of the second aeration group is arranged at an angle of 50° to 65° with the horizontal plane, so that the gas outlet direction is consistent with the propulsion direction of the fermentation material;

[0064] More specifically, the second aeration group can be divided into several aeration groups according to the needs of the stirring and mixing effect, and each second aeration group can be independently controlled to open, which is convenient for combining aeration strategies to achieve better mixing effect.

[0065] The enhancement gas nozzle 1 of the third aeration group is arranged at the discharge port of the tank body; the enhancement gas nozzle 1 of the third aeration group is arranged at an angle of 18° to 30° with the horizontal plane, and is used to blow the material out of the tank body.

[0066] More specifically, in an embodiment of the present invention, the booster gas nozzle 1 of the third aeration group is arranged at the discharge port of the tank body, and 2 to 4 booster gas nozzles 1 are arranged. The booster gas nozzle 1 has an angle of 30° with the horizontal, and the gas outlet 16 is directed toward the discharge port to prevent the material from being deposited at the discharge port and facilitate the discharge of heavy materials.

[0067] In an embodiment of the present invention, the residence time of the anaerobic material is 15 to 30 days.

[0068] In an embodiment of the present invention, the anaerobic fermentation tank of the present invention can provide a reasonable aeration strategy (frequency, time, gas flow rate, etc.) in combination with the residence time of the anaerobic material and the volume of the tank body, so as to achieve efficient stirring of high-solid / dry anaerobic fermentation of sludge, organic components of domestic waste, livestock and poultry manure, and kitchen waste. Through the design of the synergistic gas nozzle 1, a higher outlet gas velocity is obtained at the same inlet gas velocity, thereby making the energy utilization efficiency higher; the synergistic gas nozzle 1 is assembled flush with the bottom of the anaerobic fermentation tank, coupled with a high outlet gas velocity and an appropriate nozzle angle along the material propulsion direction (the main reaction zone angle is 50° to 65°), the horizontal and vertical components of the outlet gas can meet the longitudinal stirring to prevent sedimentation and stratification and the horizontal flow effect, and simultaneously achieve the reduction of material deposition around the nozzle of the anaerobic fermentation tank, extend the cycle interval of high-solid / dry anaerobic maintenance, and shorten the shutdown and dredging maintenance time after long-term operation of the anaerobic project.

[0069] So far, the introduction of the second exemplary embodiment of the anaerobic fermentation tank of the present invention is completed.

[0070] Example 3

[0071] In a third exemplary embodiment of the present invention, an anaerobic fermentation system is also provided, such as Figure 2 Shown, including

[0072] The anaerobic fermentation tank as described above is used for anaerobic fermentation;

[0073] The pressure reserve unit is used to store gas accumulation pressure, store energy for gas injection, and deliver accelerated gas to the tank through the booster gas nozzle 1 to achieve material stirring in the tank;

[0074] A monitoring unit, used for measuring the pressure value of the pressure reserve unit in real time;

[0075] The control unit is used to obtain and analyze the pressure value measured by the monitoring unit and control the operation of the pressure reserve unit.

[0076] In an embodiment of the present invention, the pressure reserve unit includes:

[0077] Gas pressure storage tank 2, used for storing compressed gas;

[0078] The high-resistance gas distribution pipe includes a main pipe and multiple branch pipes 5. One end of the main pipe is connected to the gas pressure storage tank 2, and the main pipe is connected to multiple branch pipes 5. Each branch pipe 5 is connected to multiple booster gas nozzles 1 through a hose, and is used to transport the compressed gas in the gas pressure storage tank 2 to each booster gas nozzle 1.

[0079] The booster is used to deliver gas to the gas pressure storage tank 2 so that the gas pressure storage tank 2 can store gas and accumulate pressure.

[0080] In an embodiment of the present invention, the monitoring unit includes a pressure sensor 3;

[0081] The control unit controls the operation of the pressure reserve unit, and more specifically, the control unit controls the opening and closing of the gas pressure storage tank 2 and the booster gas nozzle 1; and / or

[0082] The control unit controls the opening and closing between the booster and the gas pressure storage tank 2 .

[0083] In the embodiment of the present invention, the high-solid content / dry anaerobic high-efficiency gas stirring device proposed by the present invention includes a gas diversion and efficiency unit, a pressure reserve unit, and a control unit. The core is composed of an efficiency-enhancing gas nozzle 1, a gas pressure storage tank 2, a pressure sensor 3, and an anaerobic aeration control system 4 (i.e., a control unit).

[0084] The gas pressure storage tank 2 sprays accelerating gas into the anaerobic fermentation tank through the synergistic gas nozzle 1 to stir the material in the tank. The sprayed gas generally comes from the backflow of biogas produced by anaerobic fermentation. In order to extend the service life of the device and pipelines, the biogas is usually dehumidified; but it is not limited to biogas, and inert gases such as nitrogen can also be used to supplement the gas pressure storage tank 2.

[0085] The gas pressure sensor 3 monitors the gas pressure in the gas pressure storage tank 2 in real time and transmits the pressure value to the anaerobic aeration control system 4;

[0086] The anaerobic aeration control system 4 is connected to the gas pressure sensor 3 through wires. The obtained pressure value is used to control the opening and closing of the gas pressure storage tank 2, that is, to control the release and storage of gas. When the upper pressure limit is reached, exhaust begins, and when the pressure drops to the lower pressure limit, gas storage is carried out.

[0087] The pressurized gas released from the gas pressure storage tank 2 passes through the main section 11 of the synergistic gas nozzle 1. The gas is accelerated by the reduced diameter section 12, possessing greater kinetic energy. The pressure reaches its maximum in the throat section 13. After being ejected from the expansion section 14 through the gas outlet 16, the gas velocity is higher than that at the gas inlet 15. The gas enters the anaerobic fermentation tank, contacts and promotes the mixing of the materials, and also blows upward the denser materials deposited at the bottom to prevent them from settling further. The synergistic gas nozzle 1 of the present invention can achieve a higher outlet gas velocity under the same conditions, saving energy.

[0088] The synergistic gas nozzles 1 are connected to the branch pipes 5 in groups, the branch pipes 5 are connected to the main pipe, and the main pipe is connected to the gas pressure storage tank 2. The anaerobic aeration control system 4 controls the opening and closing of the gas pressure storage tank 2, and further controls whether each group of synergistic gas nozzles 1 sprays gas into the anaerobic fermentation tank to stir the material.

[0089] The anaerobic aeration control system 4 can independently control each aeration group and perform sequential aeration or alternating aeration according to the advancing direction of the fermentation material.

[0090] The efficient implementation of the high-efficiency gas stirring device of the present invention can control the aeration time and gas velocity in combination with the solid content and viscosity characteristics of the anaerobic fermentation material; the aeration time and gas velocity can be controlled by controlling the pressure difference of the gas pressure storage tank 2.

[0091] This concludes the introduction of the anaerobic fermentation system according to the third exemplary embodiment of the present invention.

[0092] Among them, those skilled in the art should understand that the inventive point of the present invention does not lie in the development of software or applications for the control system or control unit. Software or applications in the prior art that can realize functions such as obtaining and analyzing the pressure values ​​measured by the pressure sensor and controlling the opening and closing of the corresponding switches of the pressure reserve unit are suitable for the embodiments of the present invention and will not be elaborated here.

[0093] Example 4

[0094] In a fourth exemplary embodiment of the present invention, there is also provided an application of the above-mentioned enhanced gas nozzle 1 in the field of wet, dry or high-solid anaerobic fermentation.

[0095] In an embodiment of the present invention, the high-efficiency gas stirring device of the present invention is the core component of the high-solid / dry anaerobic fermentation gas stirring system, which replaces the mechanical stirrer components of mechanical stirring, solves the problem of mechanical wear, facilitates the full mixing of materials, and prevents the sedimentation and stratification of materials. Compared with traditional gas nozzles, it can increase efficiency and save energy.

[0096] Thus, the application of the fourth exemplary embodiment of the booster gas nozzle of the present invention has been introduced.

[0097] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anaerobic fermentation tank, characterized in that: include: Tank; The booster gas nozzle comprises a main pipe section, a reduced diameter section, a throat section and an expansion section which are connected in sequence, wherein: A main pipe section, wherein the free end of the main pipe section is configured as an air inlet; A reduced diameter section, wherein both ends of the reduced diameter section are connected to the main pipe section and the throat pipe section respectively, and the inner diameter of the reduced diameter section gradually decreases from the main pipe section to the throat pipe section, and is used to accelerate the transported gas; a throat section, wherein both ends of the throat section are connected to the reduced diameter section and the expanded section respectively; an expansion section, wherein the free end of the expansion section is configured as a gas outlet, and the inner diameter of the expansion section gradually increases from the throat section toward the free end of the expansion section, and is used to diffuse and spray the transported gas. The gas outlet end of the booster gas nozzle is flush with and communicates with the bottom of the tank body; and the booster gas nozzle is arranged at an angle to the horizontal plane; The inner diameter of the main section of the booster gas nozzle is 10mm~60mm; the taper of the reduced diameter section is 1:1~1:2.2; the taper of the expanded section is 1:3~1:8; the length to diameter ratio of the throat section is 0.8~1.4; The material of the booster gas nozzle includes stainless steel or pressure-resistant engineering plastic.

2. The anaerobic fermentation tank according to claim 1, characterized in that The plurality of enhancement gas nozzles are divided into a plurality of aeration groups, and the plurality of aeration groups are respectively arranged at different positions of the tank body; Wherein, 5 to 12 aeration groups are arranged in the tank body; each aeration group includes 2 to 20 synergistic gas nozzles.

3. The anaerobic fermentation tank according to claim 2, characterized in that The aeration group includes a first aeration group, a second aeration group and a third aeration group; The booster gas nozzle of the first aeration group is arranged at the feed inlet of the tank body and / or at a position far from the feed inlet and close to the wall of the tank body. The booster gas nozzle of the first aeration group is arranged at an angle of 75° to 85° with the horizontal plane to prevent the material from settling at the feed inlet and / or the wall of the tank body. The second aeration group is provided in a plurality, and the synergistic gas nozzles of each aeration group are arranged in an array or symmetrical arrangement in the main anaerobic fermentation reaction zone of the tank body. The synergistic gas nozzles of the second aeration group are arranged at an angle of 50° to 65° with the horizontal plane, so that the gas outlet direction is consistent with the propulsion direction of the fermentation material; Among them, the enhancement gas nozzle of the third aeration group is arranged at the discharge port of the tank body; the enhancement gas nozzle of the third aeration group is arranged at an angle of 18°~30° with the horizontal plane, which is used to blow the material out of the tank body.

4. An anaerobic fermentation system, characterized in that: include: The anaerobic fermentation tank according to any one of claims 1 to 3, used for anaerobic fermentation; The pressure reserve unit is used to store the accumulated pressure of the gas, store energy for gas injection, and deliver the accelerating gas to the tank through the synergistic gas nozzle to achieve stirring of the material in the tank; A monitoring unit, configured to measure the pressure value of the pressure reserve unit in real time; The control unit is used to obtain and analyze the pressure value measured by the monitoring unit and control the operation of the pressure reserve unit.

5. The anaerobic fermentation system according to claim 4, characterized in that: The pressure reserve unit comprises: Gas pressure storage tanks, used to store compressed gas; A high-resistance gas distribution pipe, comprising a main pipe and multiple branch pipes, one end of the main pipe being connected to the gas pressure storage tank, and the main pipe being connected to multiple branch pipes, each branch pipe being connected to multiple booster gas nozzles via a hose, for delivering the compressed gas in the gas pressure storage tank to each booster gas nozzle; The booster is used to deliver gas to the gas pressure storage tank so that the gas pressure storage tank can store gas and accumulate pressure.

6. The anaerobic fermentation system according to claim 5, characterized in that: The monitoring unit includes a pressure sensor; The control unit controls the operation of the pressure reserve unit, more specifically: the control unit controls the opening and closing of the gas pressure storage tank and the booster gas nozzle; and / or The control unit controls the opening and closing of the booster and the gas pressure storage tank.

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