Sealed stirring type microorganism hydrogen production device

Abstract

The utility model discloses a sealed stirring type microorganism hydrogen production device which comprises a biochemical device, the inner bottom of the raw material bin is communicated with the biochemical device; the air inlet end of the vacuum pump is communicated with the inner top of the biochemical device; the air outlet end of the vacuum pump is communicated with the buffer tank; the stirring device is arranged in the biochemical device; a gas collection isolation valve is arranged between the buffer tank and the stirring device; a feeding valve is arranged between the raw material bin and the biochemical device. The biochemical device extracts raw materials at the bottom of the raw material bin under the action of negative pressure; the pumped gas drives the stirring device to stir, so that the gas tightness and the purity can be guaranteed while the reaction is accelerated. The gas accumulated in the buffer tank can replace the gas in the biochemical device, so that the substandard gas can be quickly and comprehensively discharged. And the gas pressure in the buffer tank can provide power for the sludge discharge process, so that the production efficiency is further improved while the sludge discharge process is accelerated.

Description

Technical Field

[0001] The utility model belongs to the technical field of microbial fermentation, and particularly relates to a sealed stirring type microbial hydrogen production device. Background Art

[0002] Microbial hydrogen production is an advanced technology that uses the microbial fermentation process to produce hydrogen. However, if air is mixed in during the hydrogen production process, a series of adverse consequences may occur. For example, the explosion risk increases. Hydrogen is a flammable and explosive gas. If it is mixed with air to a certain proportion to form an explosive gas, a minor ignition source will cause a serious explosion. The production efficiency decreases. Mixing air may affect the normal metabolic process of microorganisms, reduce the activity of microorganisms, and thus reduce the hydrogen production efficiency. The purity of hydrogen decreases. The oxygen in the air will dilute the hydrogen, resulting in a decrease in the purity of the finally produced hydrogen, which does not meet the requirements of some applications. Therefore, effective measures must be taken to prevent air from entering during the microbial hydrogen production process to ensure the purity and safety of the produced hydrogen.

[0003] The Chinese patent document with the publication number CN114410439A discloses a new type of microbial hydrogen production power generation device, including a sealed barrel. A sealing cover is provided on the sealed barrel. A self-moving member is provided between the sealed barrel and the sealing cover. The self-moving member uses the biological decomposition products to generate pressure to produce the power for automatic movement. One side of the self-moving member is provided with a turning member for turning the waste in the sealed barrel. The bottom of the turning member is provided with a stirring member for stirring the waste. And a linkage member is provided between the self-moving member and the turning member. The linkage member drives the turning member to rotate with the self-moving member as the driving force. In this new type of microbial hydrogen production power generation device, the provided self-moving member can utilize the gas generated by the microorganisms themselves during the degradation process of the waste, so as to increase the pressure in the sealed barrel, cause the plunger to move by itself due to the relatively high pressure, and become a power source to provide a power source for the turning member and the stirring member.

[0004] In the above patent solution, in order to provide sufficient power for the turning member and the stirring member, it is necessary to make the plunger accumulate enough pressure to proceed. However, the high pressure in the sealed barrel will reduce the biochemical reaction rate. And when the pressure is too low, it cannot overcome the resistance of the reaction raw materials to provide sufficient turning or stirring effect. In addition, the above patent solution also has the technical problems that when adding reaction raw materials, the originally accumulated pressure in the sealed barrel will be released, and air will be mixed into the sealed barrel. Therefore, there are also technical problems of low hydrogen production purity and inconvenient use of the stirring function. Summary of the Utility Model

[0005] In order to overcome the technical problems in the prior art that when adding raw materials to a hydrogen production device, air will be mixed in, resulting in low purity of the produced hydrogen, and when stirring by accumulating gas pressure, the biochemical reaction rate will be reduced and it is inconvenient to use; an object of the present invention is to provide a sealed stirring type microbial hydrogen production device. By providing a vacuum pump connected to the biochemical reactor, the vacuum pump extracts the gas in the biochemical reactor, so that the raw materials are sucked into the biochemical reactor under the action of negative pressure, avoiding the mixing of air; at the same time, the gas extracted by the vacuum pump can also provide sufficient stirring power for the stirring device.

[0006] To achieve the above object, the present invention is implemented by the following technical solutions: A sealed stirring type microbial hydrogen production device includes a biochemical reactor; a raw material bin, the inner bottom of the raw material bin is connected to the biochemical reactor; a vacuum pump, the intake end of the vacuum pump is connected to the inner top of the biochemical reactor; a buffer tank, the outlet end of the vacuum pump is connected to the buffer tank; a stirring device, the stirring device is arranged in the biochemical reactor and can be driven by the high-pressure gas in the buffer tank; wherein, a gas collection isolation valve is arranged between the buffer tank and the stirring device; a feed valve is arranged between the raw material bin and the biochemical reactor.

[0007] When the gas collection isolation valve is opened and the feed valve is closed, the vacuum pump extracts the gas in the biochemical reactor to make its internal negative pressure; when only the feed valve is opened, the raw materials in the raw material bin are sucked into the biochemical reactor from the bottom under negative pressure, and very little air will be mixed in; when only the gas collection isolation valve is opened, the gas extracted by the vacuum pump forms high pressure in the buffer tank, which will drive the stirring device to stir the reactants in the biochemical reactor, improving the production rate.

[0008] Further, a gas collection valve is arranged on the biochemical reactor; one end of the gas collection valve is connected between the stirring device and the gas collection isolation valve, and the other end is connected to the inner top of the biochemical reactor; a buffer isolation valve is arranged between the buffer tank and the vacuum pump; an exhaust valve is arranged between the buffer isolation valve and the vacuum pump; one end of the exhaust valve is connected to the outside.

[0009] If air is mixed in during the process of sucking in reactants under negative pressure, or when it is detected that there are more gas impurities in the biochemical reactor, external discharge can be carried out; open the gas collection valve, the gas collection isolation valve, the exhaust valve, close the buffer isolation valve, and the vacuum pump works to extract the gas in the biochemical reactor for external discharge. The buffer tank provides high-purity hydrogen for the biochemical reactor to balance the pressure, thereby improving the discharge speed and effect of the impurity gas in the biochemical reactor.

[0010] Specifically, a vacuum isolation valve is arranged between the vacuum pump and the biochemical reactor.

[0011] Specifically, a gas supply valve with one end communicating with the outside is provided on the buffer tank; hydrogen is collected through the gas supply valve.

[0012] During various working processes of the vacuum pump, the gas accumulated in the buffer tank extracted will also be collected outward through the gas supply valve, reducing the hydrogen concentration in the bioreactor. While increasing the reaction rate, no resource waste is generated.

[0013] Specifically, a sludge discharge valve is provided at the bottom end inside the bioreactor.

[0014] Furthermore, the stirring device includes a stirring rod rotatably connected inside the bioreactor, a gearbox provided at the upper part of the bioreactor, and at least one sealed gear rotatably connected inside the gearbox; the sealed gear is in transmission connection with the stirring rod; the gearbox can be selectively communicated with the buffer tank under the control of the gas collection isolation valve; the high-pressure gas passing through the gearbox drives the sealed gear to rotate.

[0015] Specifically, two mutually meshing sealed gears are rotatably connected inside the gearbox; the end faces of the sealed gears are coaxially provided with concave and convex grooves; the outer contour of the sealed gear is in sealed fit with the inner wall of the gearbox; the air inlet and outlet of the gearbox are opposite to the meshing position of the two sealed gears.

[0016] When the high-pressure hydrogen in the buffer tank passes through the gearbox, it drives the sealed gear to rotate, and then drives the stirring device to stir the inside of the bioreactor. The stirring is discontinuous, and the interval time of each stirring can be set according to the internal raw material situation and hydrogen generation situation of the sampling reaction, etc.

[0017] Preferably, a material separation sieve is provided inside the bioreactor; the communication port between the raw material bin and the bioreactor is located below the material separation sieve.

[0018] The material separation sieve prevents the reactants in the liquid phase area below inside the bioreactor from entering the gas collection pipeline, avoiding pollution.

[0019] Specifically, an inner convex ring is provided on the inner wall of the bioreactor; the material separation sieve is located at the upper end of the inner convex ring; a support ring is provided on the outer wall of the stirring rod; the support ring abuts against the lower end of the material separation sieve.

[0020] The stirring rod rotates downward through the material separation sieve for stirring; during the process of taking out the stirring rod from the bioreactor, the material separation sieve can be synchronously taken out, facilitating the cleaning work between the bioreactor and its various components.

[0021] Furthermore, the biochemical reactor includes a reaction tank and a sealing cover detachably connected to the upper end of the reaction tank; the stirring rod is rotatably connected to the lower end of the sealing cover; the gearbox is arranged inside the sealing cover.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] 1. Under the action of negative pressure, the biochemical reactor extracts the raw materials at the bottom of the raw material bin into the biochemical reactor, avoiding the mixing of air during the feeding process and keeping a pure air environment inside the biochemical reactor.

[0024] 2. The gas extracted from the biochemical reactor forms high-pressure gas in the buffer tank, and then drives the stirring device to stir the reactants in the biochemical reactor. The stirring device is integrally arranged in the biochemical reactor, and there is no interaction and connection with the outside during the stirring process, which can not only accelerate the reaction speed but also ensure the airtightness and gas purity of the biochemical reactor.

[0025] 3. When air mixes into the biochemical reactor or the gas purity is detected to be unqualified, the exhaust valve can be opened to exhaust the gas inside the biochemical reactor. The high-purity gas accumulated in the buffer tank before can replace the unqualified gas inside the biochemical reactor, balancing the gas pressure inside the biochemical reactor and quickly and comprehensively discharging the unqualified gas inside the biochemical reactor.

[0026] 4. During the sludge discharge process of the biochemical reactor, the gas pressure in the buffer tank can provide power for the sludge discharge process, accelerating the sludge discharge process without wasting gas resources and further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the present utility model;

[0028] Figure 2 is a schematic exploded structural diagram of the components of the present utility model;

[0029] Figure 3 is a schematic structural diagram of the gearbox and the sealing gear of the present utility model;

[0030] Figure 4 is a schematic diagram of the hydrogen escape collection process of the present utility model;

[0031] Figure 5 、 Figure 6 is a schematic diagram of adding raw materials into the biochemical reactor of the present utility model;

[0032] Figure 7 is a schematic diagram of the exhaust process of the biochemical reactor of the present utility model;

[0033] Figure 8 is a schematic diagram of the buffer tank driving the stirring device to stir of the present utility model;

[0034] Figure 9 This is a schematic diagram of the sludge discharge process of the biochemical reactor of the present utility model.

[0035] In the figure: 1. Biochemical reactor; 11. Buckle plate; 12. Hand-tightening screw; 13. Inner convex ring; 2. Raw material bin; 3. Vacuum pump; 4. Buffer tank; 41. Buffer pressure gauge; 5. Sealing cover; 51. Handle; 52. Inner plate; 53. Reaction pressure gauge; 6. Gear box; 61. Sealing gear; 62. End face gear; 7. Stirring rod; 71. Support ring; 72. Stirring gear; 8. Material separation sieve; 81. Through hole; 91. Feed valve; 92. Vacuum isolation valve; 93. Buffer isolation valve; 94. Drain valve; 95. Sludge discharge valve; 96. Gas supply valve; 97. Gas collection isolation valve; 98. Gas collection valve. Specific embodiments

[0036] Next, in combination with the accompanying drawings and specific embodiments, the present utility model will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0037] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present utility model.

[0038] In addition, such terms as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise specifically defined.

[0039] In the present utility model, unless otherwise clearly specified and defined, such terms as "set", "installed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be internally connected and communicated between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] See Figures 1 - 9 , a sealed stirring type microbial hydrogen production device, which includes a bioreactor 1, and the bioreactor 1 is arranged on a mounting rack; a raw material bin 2, the raw material bin 2 is arranged on the mounting rack and on one side of the bioreactor 1, and the inner bottom of the raw material bin 2 is communicated with the middle part of the bioreactor 1; a vacuum pump 3, the vacuum pump 3 is arranged on the mounting rack and on the other side of the bioreactor 1, and the air inlet end of the vacuum pump 3 is communicated with the inner top of the bioreactor 1; a buffer tank 4, the buffer tank 4 is arranged on the mounting rack and on the side of the vacuum pump 3 away from the bioreactor 1; the air outlet end of the vacuum pump 3 is communicated with the buffer tank 4; a buffer pressure gauge 41 is arranged on the buffer tank 4.

[0041] The bioreactor 1 includes a reaction tank arranged on the mounting rack and a sealing cover 5 detachably connected to the upper end of the reaction tank; a stirring device is arranged on the sealing cover 5; a gas collection isolation valve 97 is arranged between the buffer tank 4 and the stirring device; a feed valve 91 is arranged between the raw material bin 2 and the bioreactor 1.

[0042] A gas collection valve 98 is arranged on the sealing cover 5; one end of the gas collection valve 98 is communicated between the stirring device and the gas collection isolation valve 97, and the other end is communicated with the inner top of the bioreactor 1; a buffer isolation valve 93 is arranged between the buffer tank 4 and the vacuum pump 3; a drain valve 94 is arranged between the buffer isolation valve 93 and the vacuum pump 3; one end of the drain valve 94 is communicated with the outside.

[0043] A vacuum extraction isolation valve 92 is arranged between the vacuum pump 3 and the inner top of the bioreactor 1; a sludge discharge valve 95 is arranged at the inner bottom end of the bioreactor 1; a gas supply valve 96 with one end communicated with the outside is arranged on the buffer tank 4; hydrogen is collected through the gas supply valve 96.

[0044] The stirring device includes a stirring rod 7 rotatably connected to the lower end of the sealing cover 5, a gear box 6 arranged inside the sealing cover 5, and two symmetrically arranged sealing gears 61 rotatably connected inside the gear box 6; an uneven groove is coaxially arranged on the end face of the sealing gear 61; the outer contour of the sealing gear 61 is in sealed fit with the inner wall of the gear box 6; the air inlet and outlet of the gear box 6 are opposite to the meshing position of the two sealing gears 61; the air inlet of the gear box 6 can be selectively communicated with the buffer tank 4 under the control of the gas collection isolation valve 97.

[0045] An inner plate 52 is provided at the lower end of the sealing cover 5; the stirring device is located between the inner plate 52 and the sealing cover 5; the air collecting valve 98 passes through the upper end of the sealing cover 5; two handles 51 are symmetrically provided at the upper end of the sealing cover 5; a reaction pressure gauge 53 is provided on the inner plate 52 above the sealing cover 5; the air outlet of the gear box 6 and the other end of the air collecting valve 98 pass through the inner plate 52 downward.

[0046] One of the two sealing gears 61 is coaxially provided with an end gear 62; a stirring gear 72 is coaxially provided on the upper part of the stirring rod 7 and is transmission-connected to the end gear 62; two bearings are provided on the upper part of the stirring rod 7 and are respectively installed on the inner plate 52 and the top end of the sealing cover 5.

[0047] A material separation screen 8 is detachably connected inside the biochemical reactor 1; the connecting port between the raw material bin 2 and the biochemical reactor 1 is located below the material separation screen 8; an inner convex ring 13 is provided on the inner wall of the biochemical reactor 1; the material separation screen 8 is located at the upper end of the inner convex ring 13; a supporting ring 71 is provided on the outer wall of the stirring rod 7; the supporting ring 71 abuts against the lower end of the material separation screen 8; a through hole 81 is coaxially provided on the material separation screen 8; the stirring rod 7 passes through the through hole 81.

[0048] A plurality of locking devices evenly distributed in the circumferential direction are arranged at the upper end of the outer wall of the tank body; the locking device comprises a buckle plate 11 with one end rotatably connected to the upper end of the tank body and a hand screw 12 threadedly connected to the other end of the buckle plate 11; clamping rings are arranged on the outer edge of the upper end of the tank body and the outer edge of the lower end of the sealing cover 5; the hand screw 12 presses the two clamping rings to achieve sealing.

[0049] A sealed stirring microbial hydrogen production method comprises the following steps:

[0050] Hydrogen production process:

[0051] Open the gas collecting valve 98, the gas collecting isolation valve 97, and the gas supply valve 96, and close the remaining valves. The hydrogen produced in the biochemical device 1 is transported in the form of escape (such as Figure 4 shown).

[0052] Feeding process:

[0053] (1) Open the vacuum isolation valve 92 and the buffer isolation valve 93, close the remaining valves, and turn on the vacuum pump 3 to evacuate the biochemical device 1 (such as Figure 5 shown);

[0054] (2) The vacuum isolation valve 92 and the buffer isolation valve 93 are closed, and the feed valve 91 is opened. The raw materials in the raw material bin 2 are sucked into the biochemical device 1 by negative pressure, and then the feed valve 91 is closed (as shown in FIG.Figure 6 as shown

[0055] Exhaust process:

[0056] When the feeding is completed or the gas detection in the bioreactor fails to meet the standard, open the vacuum isolation valve 92, the evacuation valve 94, the gas collection valve 98, and the gas collection isolation valve 97, close the remaining valves, and the vacuum pump 3 pumps out the gas in the bioreactor 1 and discharges it outward (as Figure 7 shown

[0057] Stirring process:

[0058] (1) Open the vacuum isolation valve 92 and the buffer isolation valve 93, close the remaining valves, turn on the vacuum pump 3 to evacuate the bioreactor 1, and the pressure in the buffer tank 4 increases (as Figure 5 shown

[0059] (2) Close the vacuum isolation valve 92 and open the gas collection isolation valve 97, and the high-pressure gas in the buffer tank 4 drives the stirring device to stir (as Figure 8 shown

[0060] Sludge discharge process:

[0061] (1) Close all valves to make the biochemical reaction in the bioreactor 1 reach positive pressure;

[0062] (2) Open the sludge discharge valve 95, the gas collection valve 98, and the gas collection isolation valve 97 to maintain continuous reaction (as Figure 9 shown

[0063] A sampling port is provided on the bioreactor 1, and raw materials are replenished or sludge is discharged regularly according to the material conditions feedback by sampling and testing, etc.; this device is suitable for all microbial hydrogen production equipment and is applicable to photo-fermentation or dark-fermentation according to whether the bioreactor is made of transparent material; this device uses the form of hydrogen diffusion for transportation, and a hydrogen storage tank can also be provided at the rear end of the gas supply valve 96 to ensure the continuity of the subsequent hydrogen using unit.

[0064] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A sealed stirring microbial hydrogen production device, characterized in that: Including biochemical device; A raw material bin, the inner bottom of which is in communication with the biochemical device; A vacuum pump, wherein the air inlet end of the vacuum pump is connected to the top of the biochemical chamber; A buffer tank, wherein the gas outlet end of the vacuum pump is connected to the buffer tank; A stirring device, which is arranged in the biochemical device and can be driven by the high-pressure gas in the buffer tank; Wherein, a gas collecting isolation valve is arranged between the buffer tank and the stirring device; and a feed valve is arranged between the raw material bin and the biochemical device.

2. The hydrogen production device according to claim 1, characterized in that: The biochemical reactor is provided with a gas collecting valve; one end of the gas collecting valve is connected with the stirring device and the gas collecting isolation valve, and the other end is connected with the top of the biochemical reactor; a buffer isolation valve is provided between the buffer tank and the vacuum pump; an exhaust valve is provided between the buffer isolation valve and the vacuum pump; one end of the exhaust valve is connected with the outside.

3. The hydrogen production device according to any one of claims 1-2, characterized in that: A vacuum isolation valve is arranged between the vacuum pump and the biochemical reactor; and a mud discharge valve is arranged at the bottom end of the biochemical reactor.

4. The hydrogen production device according to any one of claims 1-2, characterized in that: The buffer tank is provided with a gas supply valve with one end connected to the outside; hydrogen is collected through the gas supply valve.

5. The hydrogen production device according to any one of claims 1-2, characterized in that: The stirring device includes a stirring rod rotatably connected to the biochemical reactor, a gear box arranged on the upper part of the biochemical reactor, and at least one sealing gear rotatably connected to the gear box; the sealing gear is transmission-connected to the stirring rod; the gear box can be selectively connected to the buffer tank under the control of the gas collecting isolation valve; the high-pressure gas passing through the gear box drives the sealing gear to rotate.

6. The hydrogen production device according to claim 5, characterized in that: The gear box is rotatably connected with two mutually meshing sealing gears; the end faces of the sealing gears are coaxially provided with concave and convex grooves; the outer contour of the sealing gear is sealed and fitted with the inner wall of the gear box; the air inlet and outlet of the gear box are directly opposite to the meshing positions of the two sealing gears.

7. The hydrogen production device according to claim 5, characterized in that: A material separation screen is arranged in the biochemical device; and a connecting port between the raw material bin and the biochemical device is located below the material separation screen.

8. The hydrogen production device according to claim 7, characterized in that: The inner wall of the biochemical device is provided with an inner convex ring; the material separation screen is located at the upper end of the inner convex ring; the outer wall of the stirring rod is provided with a supporting ring; the supporting ring is against the lower end of the material separation screen.

9. The hydrogen production device according to claim 5, characterized in that: The biochemical device comprises a reaction tank and a sealing cover detachably connected to the upper end of the reaction tank; the stirring rod is rotatably connected to the lower end of the sealing cover; and the gear box is arranged inside the sealing cover.

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