Sealed photosynthetic biological hydrogen production device

Abstract

The invention discloses a sealed photosynthetic biological hydrogen production device, and relates to the technical field of photosynthetic biological hydrogen production, the sealed photosynthetic biological hydrogen production device is provided with a constant temperature water tank, a feeding tank, a main reaction tank, an acid tank, an alkali tank, a three-layer purification tank and a gas storage tank, the device adopts a modular combination design, and the outer side of the main reaction tank is wrapped by the constant temperature water tank; the feeding tank, the acid tank and the alkali tank are respectively connected through pipelines, and a mud valve is arranged at the bottom; the main reaction tank is sequentially connected with the three layers of purification tanks and the gas storage tank through gas guide pipelines, a stirring system is arranged in the main reaction tank, and an observation window and a sampling opening are formed in the side wall of the main reaction tank. The problems that an existing device is fixed in structure, low in parameter regulation and control precision, insufficient in gas production purity, poor in safety and the like are solved, the stability of the photosynthetic organism culture environment is guaranteed, and the hydrogen production efficiency and the hydrogen purity are improved.

Description

Technical Field

[0001] This invention belongs to the field of photosynthetic biological hydrogen production technology, and specifically relates to a sealed photosynthetic biological hydrogen production device. Background Technology

[0002] With the global energy crisis and environmental problems becoming increasingly prominent, hydrogen energy, as a clean, efficient, and renewable energy carrier, has broad application prospects. Photosynthetic biohydrogen production technology utilizes photosynthetic microorganisms (such as photosynthetic bacteria) to metabolize and transform organic matter to produce hydrogen, offering advantages such as abundant raw materials, mild reaction conditions, and environmental friendliness. However, existing devices have several drawbacks: 1. Fixed structure: Most are one-piece designs, which are inconvenient to disassemble and assemble, and difficult to clean the inside, replace the bottom material and maintain. They are also prone to the growth of impurities after long-term use. 2. Low precision in parameter control: Key culture parameters such as temperature and pH are difficult to control precisely, resulting in an unstable growth environment for photosynthetic organisms and limiting hydrogen production efficiency; 3. Poor mixing effect: The mixing method is monotonous, resulting in dead zones, uneven mixing of photosynthetic organisms and substrates, and easy sedimentation and clumping of bottom materials; 4. Insufficient gas purity: The gas purification process is simple, and CO2, moisture and impurities are easily mixed into the hydrogen, which cannot meet the requirements of high-end applications. 5. Poor sealing and safety: Air can easily be mixed in during operations such as adding and sampling, which reduces the purity of hydrogen and poses an explosion risk.

[0003] Utility model announcement CN223688472U discloses a tank structure for a PEM hydrogen production device. Key technical features include a tank body with a gas-water inlet pipe and a gas outlet pipe connected to it; a gas-water barrier separation plate fixedly connected to the tank body, with several through holes distributed on it; and multiple gas-water guide separation plates, spaced and staggered above the gas-water barrier separation plate. Each gas-water guide separation plate has a notch at one end, and the multiple gas-water barrier separation plates form a surrounding flow channel through the notches, which communicates with the through holes. By installing the gas-water barrier separation plate inside the tank body, upward-flowing water vapor is blocked by the plate, causing it to adhere and accumulate on the lower surface of the plate and drip to the bottom of the tank for storage, emphasizing secondary separation of the gas.

[0004] The invention disclosed in CN223163412U is a high-efficiency microbial hydrogen production device. Its key technical features include a fermenter body with a sealing cover and a rotating assembly. The sealing cover has two symmetrical first connecting plates at its bottom, each with a first magnetic surface on one side. The inner wall of the fermenter body has two symmetrical second connecting plates, each with a second magnetic surface at its bottom. The rotating assembly includes a stirring component, which consists of a rotating rod connected to the rotating assembly. A connecting plate is mounted on the top of the rotating rod, and the connecting plate has multiple grooves arranged in an array. Moving components are installed inside the grooves. This device ensures that the material in each area of ​​the fermenter is fully and effectively stirred, thereby creating a favorable environment for microbial growth and metabolism, and improving the efficiency and quality of hydrogen production. However, its focus is on arranging the stirring assembly within the fermenter to achieve stirring; it does not involve modular or separate structural components, nor does it include any purification structure. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a sealed photosynthetic biohydrogen production device, which solves the problems of fixed structure, low parameter control accuracy, and poor safety of existing devices.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A sealed photosynthetic biohydrogen production device includes a constant temperature water tank, a feeding tank, a main reaction tank, an acid tank, an alkali tank, a three-layer purification tank and a gas storage tank. The constant temperature water tank is wrapped around the outside of the main reaction tank (3) and forms a closed heat exchange chamber with the outer wall of the main reaction tank. The feeding tank is connected to the upper part of the main reaction tank through the discharge device and discharge control valve. The acid tank and alkali tank are connected to the main reaction tank through the metering pump and corresponding regulating pipeline. The top of the main reaction tank is connected to the purification inlet of the three-layer purification tank through a gas guide pipe, while the purification outlet of the three-layer purification tank is connected to the gas storage tank through a gas guide pipe. The main reaction tank is also equipped with a stirring system, and has observation windows and sampling ports on the side walls, while a sludge discharge valve is installed at the bottom. The stirring system includes a stirring shaft and at least three sets of stirring blades arranged on the stirring shaft, with the bottom stirring blades close to the bottom of the main reaction tank, and the top of the stirring shaft being connected to a drive motor fixed outside the main reaction tank.

[0007] Each set of stirring blades includes a transverse connecting rod and an arc-shaped stirring blade, with the transverse connecting rod vertically fixed on the stirring shaft and the arc-shaped stirring blade at the end. The curved stirring blades bend in the same direction as the stirring shaft rotates.

[0008] The stirring blades are evenly spaced along the axial direction on the stirring shaft, and each group of stirring blades has at least two blades along the circumferential direction.

[0009] The three-layer purification tank contains, from bottom to top, a desiccant layer for removing moisture, an adsorbent layer for adsorbing carbon dioxide, and a filter membrane layer for filtering impurities.

[0010] The main reaction vessel includes a vessel body and a detachable lid mounted on the top of the vessel body. A sealing gasket is provided between the lid and the vessel body and the lid is fixed by circumferentially distributed locking bolts.

[0011] A one-way valve is also installed on the gas guide pipe between the main reaction tank and the three-layer purification tank, and a vent valve is also installed at the bottom of the gas storage tank.

[0012] The top of the feeding tank is also equipped with a feed inlet, while the sampling port of the main reaction tank is equipped with a sealing plug and a filter screen is installed at the connection between the sampling port and the inside of the main reaction tank.

[0013] The constant temperature water tank is equipped with heating pipes, a circulating water pump, and a temperature sensor electrically connected to both. The circulating water pump is used to drive the heat transfer medium in the sealed heat exchange chamber to circulate.

[0014] Both the acid tank and the alkali tank are equipped with level gauges and replenishment ports, and the replenishment ports are equipped with sealing plugs. The main reaction vessel is also equipped with a pH sensor, which is electrically connected to the metering pump to form a pH adjustment loop.

[0015] The inner wall of the main reaction vessel is coated with an anti-corrosion coating, and LED light sources are embedded in the side walls. Both the gas delivery pipes and the regulating pipes are made of corrosion-resistant and sealed pipes.

[0016] The beneficial effects of this invention are: (1) This invention discloses a sealed photosynthetic biohydrogen production device. It is equipped with a constant temperature water tank, a feeding tank, a main reaction tank, an acid tank, an alkali tank, a three-layer purification tank and a gas storage tank. The device adopts a modular combination design. The main reaction tank is wrapped with a constant temperature water tank and connected to the feeding tank, acid tank and alkali tank through pipes. A sludge discharge valve is installed at the bottom. The main reaction tank is connected to the three-layer purification tank and the gas storage tank in sequence through a gas guide pipe. It is equipped with a stirring system inside and has an observation window and a sampling port on the side wall. The modular structure enables convenient disassembly and maintenance. Combined with precise temperature control, pH adjustment, efficient stirring and multi-level gas purification, it solves the problems of fixed structure, low parameter control accuracy, insufficient gas purity and poor safety of existing devices. It ensures the stability of the photosynthetic bioculture environment and improves hydrogen production efficiency and hydrogen purity.

[0017] (2) Modular structure design improves maintenance convenience. Each functional unit is set independently and can be detached and connected. The main reaction tank adopts a split tank cover, which is convenient for disassembly, cleaning and maintenance. It solves the problem of difficult disassembly and assembly of traditional integrated devices and can quickly complete cleaning, substrate replacement and component maintenance.

[0018] (3) The reaction environment data are collected by temperature sensor and pH sensor, and an independent control loop is formed with heating tube, circulating water pump and metering pump to achieve precise adjustment of temperature and pH value, thereby improving reaction efficiency. The precise temperature control system provides a stable temperature environment for photosynthetic organisms, and the pH adjustment system maintains suitable growth and metabolism conditions. With the addition of a stirring structure without dead angles, it ensures that photosynthetic organisms and substrates are in full contact, significantly reducing the probability of material deposition and improving the hydrogen production rate.

[0019] (4) Hydrogen purity optimization, efficient stirring and purification mechanism, multiple sets of arc-shaped stirring blades to achieve no dead angle mixing, three-layer purification tank through desiccant layer, adsorbent layer and filter membrane layer for graded purification, improve hydrogen purity through graded purification, effectively remove moisture, CO2 and small impurities in hydrogen, and obtain high-purity hydrogen.

[0020] (5) Enhanced safety and controllability: Each connection part adopts a sealed design, and with the cooperation of one-way valve, pressure sensor with signal connection and vent valve, air mixing and overpressure risk are avoided. The full-process sealed design avoids air mixing. The pressure sensor and vent valve signal connection realize real-time monitoring and overpressure relief. With the cooperation of observation window and sealed sampling port, the hydrogen production process is visualized and safe and controllable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the main reaction vessel of the present invention; Figure 3 This is a cross-sectional view of the feeding tank of the present invention; Figure 4 This is a cross-sectional view of the three-layer purification tank of the present invention; Figure 5 This is a cross-sectional view of the constant temperature water tank of the present invention. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] This invention provides a sealed photosynthetic biohydrogen production device, such as... Figures 1 to 5 As shown.

[0024] A high-efficiency sealed photosynthetic biohydrogen production device includes a constant temperature water tank (1), a feeding tank (2), a main reaction tank (3), an acid tank (4), an alkali tank (5), a three-layer purification tank (6), and a gas storage tank (7); the constant temperature water tank (1) is wrapped around the outside of the main reaction tank (3) and forms a sealed heat exchange chamber with the outer wall of the main reaction tank (3); the feeding tank (2) is connected to the upper part of the main reaction tank (3) through a discharge device (22) and a discharge control valve (23); the acid tank (4) and the alkali tank (5) The main reaction tank (3) is connected to the main reaction tank (3) via metering pumps (41, 51) and corresponding regulating pipes respectively; the top of the main reaction tank (3) is connected to the purification inlet (64) of the three-layer purification tank (6) via a gas guide pipe, and the purification outlet (65) of the three-layer purification tank (6) is connected to the gas storage tank (7) via a gas guide pipe; the main reaction tank (3) is equipped with a stirring system, and the side wall is equipped with an observation window (31) and a sampling port (32), and the bottom is equipped with a mud discharge valve (33).

[0025] The stirring system includes a drive motor (8), a stirring shaft (81), and stirring blades (82). The drive motor (8) is fixed on the tank cover at the top of the main reaction tank (3), and its output end is connected to the stirring shaft (81) via a coupling. The stirring shaft (81) extends vertically into the interior of the main reaction tank (3), and at least three sets of stirring blades (82) are evenly distributed on the shaft. The bottom stirring blades (82) are close to the bottom of the main reaction tank (3) to ensure that the distance is sufficient to effectively stir the bottom sediment.

[0026] The stirring blade (82) includes a transverse connecting rod and an arc-shaped stirring plate. The transverse connecting rod is welded and fixed perpendicularly to the stirring shaft (81). The arc-shaped stirring plate is integrally formed at the end of the transverse connecting rod, and the bending direction of the arc-shaped stirring plate is consistent with the rotation direction of the stirring shaft (81), which can reduce stirring resistance and enhance the axial circulation flow of materials. After the drive motor (8) is started, the stirring shaft (81) drives the three sets of stirring blades (82) to rotate synchronously, realizing the mixing of materials in the upper, middle and lower areas of the main reaction tank (3) without dead angles.

[0027] In this embodiment, the three-layer purification tank (6) is provided with a desiccant layer (61), an adsorbent layer (62), and a filter membrane layer (63). Preferably, the layers are arranged from bottom to top, and the desiccant, carbon dioxide adsorbent, and filter membrane material are filled in sequence. The purification inlet (64) and purification outlet (65) are respectively located at the bottom and top of the three-layer purification tank (6), so that the gas can fully contact each purification layer when it flows through each purification layer, thereby improving the purification effect. The side wall of the three-layer purification tank (6) is provided with an inspection port corresponding to each purification layer. The inspection port is fixed with a sealing cover by bolts, which facilitates the periodic replacement of the purification medium. The hydrogen generated in the main reaction tank (3) enters the purification inlet (64) through the gas guide pipe, and passes through each purification layer in sequence to remove moisture, adsorb carbon dioxide, and filter impurities. The purified high-purity hydrogen enters the gas storage tank (7) through the purification outlet (65).

[0028] Furthermore, a one-way valve is installed on the gas guide pipe between the main reaction tank (3) and the three-layer purification tank (6) to prevent the purified hydrogen from flowing back to the main reaction tank (3); and a pressure sensor and a vent valve (71) are installed on the gas storage tank (7), and the pressure sensor is connected to the vent valve (71) for signal transmission. The pressure sensor collects the pressure data in the tank in real time. When the pressure exceeds the set threshold, the vent valve (71) is triggered to open automatically to release pressure. When the pressure drops to a safe range, it closes automatically to avoid the risk of overpressure in the tank.

[0029] The feeding tank (2) is equipped with a feed inlet (21) at the top and a conical structure at the bottom. The discharge device (22) is connected to the lower end of the conical structure. A sealing plug is installed in the sampling port (32), and a filter screen is installed at the connection between the sampling port (32) and the main reaction tank (3) to prevent the reaction material from being lost during sampling. When feeding, open the feed inlet (21) to add raw materials (such as glucose, organic wastewater and photosynthetic microbial liquid), close the feed inlet (21) and open the discharge control valve (23). The raw materials enter the main reaction tank (3) through the discharge device (22) under the action of gravity. When sampling, pull out the sealing plug and extract the sample through the sampling tube. After sampling, re-tighten the sealing plug to ensure the sealing of the device.

[0030] Furthermore, the main reaction vessel (3) includes a vessel body and a detachable lid connected to the top of the vessel body; a sealing gasket is provided between the lid and the vessel body, and the lid is fixedly connected by circumferentially evenly distributed locking bolts. To prevent the reaction system from corroding the vessel body, the inner wall of the vessel body is coated with an anti-corrosion coating; and the observation window (31) is made of high-strength transparent pressure-resistant material and is fixed to the side wall of the vessel body by sealing welding, which facilitates real-time observation of the internal reaction status. The side wall of the main reaction vessel (3) is also equipped with an LED light source (35) to provide necessary illumination for photosynthetic microorganisms; and a buzzer (34) is installed on its top for system abnormality alarm. The lid can be removed by loosening the locking bolts, and the interior of the main reaction vessel (3) can be thoroughly cleaned and maintained.

[0031] Furthermore, the constant temperature water tank (1) is equipped with a control panel (13), a heating tube (12), and a circulating water pump, which are used to heat and circulate the medium in the heat exchange chamber to achieve temperature control. The heating tube (12) and the circulating water pump are electrically connected to the temperature sensor to form a temperature control loop. The circulating water pump is used to drive the heat transfer medium in the heat exchange chamber to circulate. The target temperature is set through the temperature control loop, and the temperature sensor collects the temperature of the heat transfer medium in real time. When the temperature is lower than the set value, the heating tube (12) starts heating, and at the same time the circulating water pump drives the heat transfer medium to circulate, ensuring that the temperature of each area of ​​the main reaction tank (3) is uniform and achieving precise temperature control.

[0032] Furthermore, both the acid tank (4) and the alkali tank (5) are equipped with replenishment ports (42, 52), and sealing plugs are installed at the replenishment ports; a pH sensor is also installed in the main reaction tank (3), and the pH sensor is electrically connected to the metering pump (41, 51) to form a pH adjustment circuit; the pH sensor collects the pH value of the reaction system in real time, and when the pH value deviates from the set range, the adjustment circuit drives the corresponding metering pump to start, pumping acid or alkali into the main reaction tank (3) to realize automatic pH adjustment.

[0033] The workflow of this sealed photosynthetic biohydrogen production device is as follows: 1. Preparation and feeding stage: Open the feed inlet (21) of the feeding tank (2), add raw materials such as organic substrate and photosynthetic microbial liquid, and close the feed inlet (21); inject the heat transfer medium through the water valve (11) of the constant temperature water tank (1), set the target temperature and start the heating pipe (12) and the circulating water pump; check the replenishment port (42) of the acid tank (4) and the replenishment port (52) of the alkali tank (5) to ensure that the acid and alkali solutions are sufficient and that the pipe connections and valves are well sealed.

[0034] 2. Reaction and Regulation Stage: Open the discharge control valve (23) at the bottom of the feeding tank (2), and close the valve after the raw material enters the main reaction tank (3) through the discharge device (22). Start the drive motor (8) to drive the stirring shaft (81) and stirring blades (82) to rotate, so that the photosynthetic microorganisms and substrates are fully mixed. Turn on the LED light source (35) on the side wall of the main reaction tank (3) to provide light for photosynthesis. The constant temperature water tank (1) maintains the main reaction tank (3) in a constant temperature reaction environment through its heating and circulation system. Acid or alkali solution is automatically pumped into the main reaction tank (3) through the pH adjustment circuit (the metering pumps 41 and 51 controlled by the pH sensor) to maintain the pH value of the reaction system.

[0035] 3. Gas production, purification, and storage stage: Hydrogen generated in the main reaction tank (3) enters the purification inlet (64) of the three-layer purification tank (6) through the gas guide pipe, and passes through the desiccant layer (61), adsorbent layer (62) and filter membrane layer (63) from bottom to top to remove moisture, carbon dioxide and impurities. The purified high-purity hydrogen enters the gas storage tank (7) for storage through the purification outlet (65). When the pressure in the gas storage tank (7) exceeds the set safety value, the vent valve (71) on its top will automatically open to release pressure. If abnormal parameters such as temperature and pressure occur, the buzzer (34) on the top of the main reaction tank (3) will sound an alarm.

[0036] 4. Shutdown, slag removal, and maintenance phase: After the reaction is complete, turn off the drive motor (8), LED light source (35) and all control systems; open the sludge discharge valve (33) at the bottom of the main reaction tank (3) to discharge the reaction residue; the final sample can be extracted through the sampling port (32) for analysis. During regular maintenance, the tank cover of the main reaction tank (3) can be removed for thorough cleaning; open the corresponding inspection port on the side wall of the three-layer purification tank (6) to replace the desiccant, adsorbent and filter membrane.

[0037] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing the invention and simplifying the description, and the above terms have no special meaning.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

[0039] In the description of this invention, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

Claims

1. A sealed photosynthetic biohydrogen production device, characterized in that: It includes a constant temperature water tank, a feeding tank, a main reaction tank, an acid tank, an alkali tank, a three-layer purification tank, and a gas storage tank. The constant temperature water tank is wrapped around the outside of the main reaction tank and forms a closed heat exchange chamber with the outer wall of the main reaction tank. The feeding tank is connected to the upper part of the main reaction tank through the discharge device and discharge control valve. The acid tank and alkali tank are connected to the main reaction tank through the metering pump and corresponding regulating pipeline. The top of the main reaction tank is connected to the purification inlet of the three-layer purification tank through a gas guide pipe, while the purification outlet of the three-layer purification tank is connected to the gas storage tank through a gas guide pipe. The main reaction tank is also equipped with a stirring system, and has observation windows and sampling ports on the side walls, while a sludge discharge valve is installed at the bottom. The stirring system includes a stirring shaft and at least three sets of stirring blades arranged on the stirring shaft, with the bottom stirring blades close to the bottom of the main reaction tank, and the top of the stirring shaft being connected to a drive motor fixed outside the main reaction tank.

2. The sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: Each set of stirring blades includes a transverse connecting rod and an arc-shaped stirring blade, with the transverse connecting rod vertically fixed on the stirring shaft and the arc-shaped stirring blade at the end. The curved stirring blades bend in the same direction as the stirring shaft rotates.

3. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The stirring blades are evenly spaced along the axial direction on the stirring shaft, and each group of stirring blades has at least two blades along the circumferential direction.

4. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The three-layer purification tank contains, from bottom to top, a desiccant layer for removing moisture, an adsorbent layer for adsorbing carbon dioxide, and a filter membrane layer for filtering impurities.

5. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The main reaction vessel includes a vessel body and a detachable lid mounted on the top of the vessel body. A sealing gasket is provided between the lid and the vessel body and the lid is fixed by circumferentially distributed locking bolts.

6. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: A one-way valve is also installed on the gas guide pipe between the main reaction tank and the three-layer purification tank, and a vent valve is also installed at the bottom of the gas storage tank.

7. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The top of the feeding tank is also equipped with a feed inlet, while the sampling port of the main reaction tank is equipped with a sealing plug and a filter screen is installed at the connection between the sampling port and the inside of the main reaction tank.

8. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The constant temperature water tank is equipped with heating pipes, a circulating water pump, and a temperature sensor electrically connected to both. The circulating water pump is used to drive the heat transfer medium in the sealed heat exchange chamber to circulate.

9. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: Both the acid tank and the alkali tank are equipped with level gauges and replenishment ports, and the replenishment ports are equipped with sealing plugs. The main reaction vessel is also equipped with a pH sensor, which is electrically connected to the metering pump to form a pH adjustment loop.

10. A sealed photosynthetic biohydrogen production device according to claim 1, characterized in that: The inner wall of the main reaction vessel is coated with an anti-corrosion coating, and LED light sources are embedded in the side walls. Both the gas delivery pipes and the regulating pipes are made of corrosion-resistant and sealed pipes.

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