A medium and small-sized biogas hydrogen production device

Abstract

The present invention relates to the technical field of biogas treatment, and specifically to a medium and small-sized biogas hydrogen production device, which includes a biogas digester and a first three-way pipe. There is a support frame on one side of the biogas digester, and a dry desulfurization tower is on the support frame. There is an air inlet pipe on one side of the dry desulfurization tower; there is an air outlet pipe and a second three-way pipe on the dry desulfurization tower. There is a high-temperature decomposition tower on one side of the dry desulfurization tower. There is a U-shaped air exchange pipe on the air outlet pipe, and a two-way vacuum pump is on the U-shaped air exchange pipe. The present invention can achieve the purpose of circulating desulfurization through the combination of two dry desulfurization towers. After the adsorbent of one side of the dry desulfurization tower is saturated, the flow direction of the biogas can be switched through the first three-way pipe and the second three-way pipe, and then the remaining biogas and hydrogen sulfide on the other side are pumped into the biogas channel through the two-way vacuum pump, thereby greatly reducing the probability of hydrogen sulfide leakage, reducing the corrosion degree of the internal parts of the hydrogen production device by hydrogen sulfide, and at the same time, it can also alleviate the environmental pollution caused by the sulfide decomposed by the high-temperature decomposition tower.

Description

Technical Field

[0001] The present invention relates to a hydrogen production device, in particular to a medium and small-sized biogas hydrogen production device, belonging to the technical field of biogas treatment. Background Art

[0002] Biogas can be divided into two categories: natural biogas and artificial biogas. Natural biogas is distributed in nature and is commonly found in environments such as swamps, ponds, septic tanks, sewage pipes (wells), etc.; while artificial biogas is produced, collected and utilized in a closed fermentation device (biogas digester) designed and built in accordance with relevant technical specifications by meeting the conditions for microbial fermentation. A biogas hydrogen production device is a device that uses biogas as a raw material to produce hydrogen through a series of chemical reactions and physical processes.

[0003] The main component of biogas is methane (CH4), usually accounting for 50% - 80% of the total volume. In addition, it also contains 20% - 40% carbon dioxide (CO2), 0% - 5% nitrogen (N2), less than 1% hydrogen (H2), less than 0.4% oxygen (O2), and 0.1% - 3% hydrogen sulfide (H2S) and other gases. Due to the presence of a small amount of hydrogen sulfide, biogas has a slightly pungent odor, but its characteristics are similar to those of natural gas. Hydrogen sulfide (H2S) is a colorless and highly toxic acidic gas. The desulfurization of biogas mainly removes hydrogen sulfide through a desulfurization tower to prevent it from corroding the internal parts of the hydrogen production device.

[0004] Medium and small-sized biogas digesters usually use a dry desulfurization tower to preliminarily treat biogas. Dry desulfurization uses an adsorbent to react with sulfides to form solid sulfides, thereby achieving the purpose of desulfurization. Since the adsorbent in the dry desulfurization tower needs to be replaced regularly, there may be a situation where the adsorbent is not replaced in time, resulting in the leakage of hydrogen sulfide. On the one hand, it may corrode the internal parts of the hydrogen production device, and on the other hand, the sulfides generated by high-temperature decomposition will pollute the environment.

[0005] Therefore, it is urgent to improve the medium and small-sized biogas hydrogen production device to solve the above existing problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a medium and small-sized biogas hydrogen production device, which can achieve the purpose of circulating desulfurization through the combination of two dry desulfurization towers. After the adsorbent in one side of the dry desulfurization tower is saturated, the flow direction of biogas can be switched through the first three-way pipe and the second three-way pipe, and then the remaining biogas and hydrogen sulfide on the other side are pumped into the biogas channel through a two-way vacuum pump, thereby greatly reducing the probability of hydrogen sulfide leakage, reducing the corrosion degree of hydrogen sulfide on the internal parts of the hydrogen production device, and at the same time, it can also alleviate the pollution of the sulfides decomposed by the high-temperature decomposition tower to the environment.

[0007] In order to achieve the above purpose, the main technical solutions adopted by the present invention include:

[0008] A medium and small-sized biogas hydrogen production device, comprising a biogas digester and a first three-way pipe fixedly installed on the biogas digester. A support frame is fixedly arranged on one side of the biogas digester, and two symmetrically distributed dry desulfurization towers are fixedly installed above the support frame. An air inlet pipe is fixedly arranged on the side of the dry desulfurization tower corresponding to the biogas digester. One end of the first three-way pipe far from the biogas digester is fixedly connected to the air inlet pipe, and the dry desulfurization tower is communicated with the inside of the biogas digester through the first three-way pipe;

[0009] Two symmetrically distributed air outlet pipes are fixedly arranged at the upper end of the dry desulfurization tower. A second three-way pipe is fixedly connected to the air outlet pipe. A high-temperature decomposition tower is fixedly arranged on one side of the dry desulfurization tower. One end of the second three-way pipe far from the dry desulfurization tower extends into the inside of the high-temperature decomposition tower. A U-shaped air exchange pipe is fixedly connected to the air outlet pipe close to the first three-way pipe. The U-shaped air exchange pipe extends to the bottom side of the air inlet pipe. A two-way vacuum pump is fixedly arranged on the U-shaped air exchange pipe. The interiors of the two dry desulfurization towers are communicated through the U-shaped air exchange pipe.

[0010] Preferably, two symmetrically distributed butterfly valves are fixedly installed on the first three-way pipe. The butterfly valves correspond to the air inlet pipes one by one. The valve stem of the butterfly valve penetrates through the first three-way pipe and extends to both sides of the butterfly valve. A driven gear is fixedly installed at the bottom end of the valve stem.

[0011] Preferably, a driving motor is fixedly installed at the bottom end of the support frame. The output end of the driving motor penetrates through the support frame and extends above the support frame. A driving gear is fixedly installed at the output end of the driving motor. A chain is meshed on the outside of the driving gear. The chain is meshed with the driven gears on both sides of the first three-way pipe.

[0012] Preferably, a luminol test kit is fixedly arranged inside the air outlet pipe close to the high-temperature decomposition tower. A photosensitive resistor is fixedly installed at the position of the second three-way pipe corresponding to the luminol test kit. A synchronous motor is fixedly arranged at the upper end of the photosensitive resistor. The synchronous motor is electrically connected to the photosensitive resistor through a wire. A driven rotating plate is clamped at the output end of the synchronous motor. A number of uniformly distributed arc-shaped air exchange holes are formed in the driven rotating plate. A fixed cover plate is fixedly installed inside the second three-way pipe. A number of uniformly distributed arc-shaped ventilation holes are formed in the fixed cover plate. The arc-shaped ventilation holes correspond to the arc-shaped air exchange holes.

[0013] Preferably, a clamping rod is fixedly connected to the output end of the synchronous motor. Second electrode blocks are fixedly arranged at both ends of the clamping rod. The second electrode blocks are electrically connected to the positive and negative electrodes of an external power supply through wires. Two symmetrically distributed first electrode plates are fixedly arranged inside the fixed cover plate. The two first electrode plates are respectively electrically connected to the positive and negative electrodes of the driving gear through wires.

[0014] Preferably, a bayonet is formed on the driven rotating plate. The clamping rod passes through the bayonet and extends above the driven rotating plate. The driven rotating plate is clamped with the clamping rod through the bayonet.

[0015] Preferably, a fixed rod is fixedly installed on the upper side of the butterfly valve. A protective cover is fixedly installed on the fixed rod. The valve stem is rotatably arranged inside the protective cover.

[0016] Preferably, first electrode blocks are fixedly installed on both sides of the butterfly valve. The two first electrode blocks are respectively electrically connected to the positive and negative electrodes of an external power supply through wires. A second electrode plate is fixedly installed inside the fixed rod. The second electrode plate corresponds to the first electrode block. One ends of the two second electrode plates are respectively electrically connected to the positive and negative electrodes of the power supply of the two-way vacuum pump through wires.

[0017] Preferably, a replacement port is fixedly installed on one side of the dry desulfurization tower through bolts. The inside of the dry desulfurization tower is communicated with the outside through the replacement port. A sealing cover is fixedly installed at the upper end of the dry desulfurization tower. A pressure sensor is fixedly installed on the sealing cover. The pressure sensor extends into the dry desulfurization tower. The pressure sensor is electrically connected to an external control mechanism through a wire.

[0018] Preferably, a stirring assembly is fixedly installed at the upper end of the biogas digester. The output end of the stirring assembly penetrates through the upper end of the biogas digester and extends into the biogas digester.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. The present invention can achieve the purpose of circulating desulfurization through the combination of two dry desulfurization towers. After the adsorbent in one side of the dry desulfurization tower is saturated, the flow direction of biogas can be switched through the first three-way pipe and the second three-way pipe, and then the remaining biogas and hydrogen sulfide on the other side are pumped into the biogas channel through the two-way vacuum pump, thereby greatly reducing the probability of hydrogen sulfide leakage, reducing the corrosion degree of the internal parts of the hydrogen production device by hydrogen sulfide, and at the same time, it can also alleviate the environmental pollution caused by the sulfide decomposed by the high-temperature decomposition tower.

[0021] 2. During the rotation of the driving lever and the driven rotating plate of the synchronous motor on one side of the present invention, the second electrode block contacts the first electrode sheet, forming a circuit for the driving motor. At this time, the driving motor is used to drive the driven gear to rotate through the driving gear and the chain to close the corresponding butterfly valve, and the butterfly valve on the other side is opened, thereby realizing the change of the entire circulation direction of the biogas. No manual operation is required, which not only simplifies the control logic but also is sensitive and timely, greatly reducing the probability of hydrogen sulfide leakage.

[0022] 3. After the arc-shaped ventilation hole and the arc-shaped air exchange hole of the present invention are staggered, the butterfly valve on the side driven by the driving motor is closed, and the butterfly valve on the other side is opened. At this time, after the valve stem rotates, the second electrode sheet on one side contacts the first electrode block, and the two-way vacuum pump is powered on and started, and the residual gas in the dry desulfurization tower is transported to the biogas conversion path on the other side through the U-shaped air exchange pipe, which can prevent the excess biogas and hydrogen sulfide from overflowing when replacing the adsorbent. On the one hand, it saves more and improves the hydrogen production efficiency, and on the other hand, it can also reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0024] Figure 1 is a three-dimensional structure diagram provided by the present invention;

[0025] Figure 2 is a sectional elevation view of the first three-way pipe provided by the present invention;

[0026] Figure 3 is provided by the present invention Figure 1 is an enlarged schematic view at A in

[0027] Figure 4 is an exploded schematic view of the driven rotating plate and the fixed cover plate provided by the present invention;

[0028] Figure 5 is an exploded schematic view of the first three-way pipe and the fixed rod provided by the present invention;

[0029] Figure 6 is a structural schematic diagram of the dry desulfurization tower provided by the present invention;

[0030] Figure 7 is a circuit schematic diagram of the two-way vacuum pump provided by the present invention;

[0031] Figure 8 is a circuit schematic diagram of the driving motor provided by the present invention.

[0032] In the figure, 1 is a biogas digester; 2 is a first three-way pipe; 21 is a butterfly valve; 22 is a valve stem; 23 is a driven gear; 24 is a first electrode block; 3 is a support frame; 4 is a dry desulfurization tower; 41 is an air outlet pipe; 42 is a U-shaped air exchange pipe; 43 is a luminol test kit; 44 is a replacement port; 45 is a sealing cover; 46 is a pressure sensor; 5 is an air inlet pipe; 6 is a second three-way pipe; 61 is a photoresistor; 62 is a synchronous motor; 621 is a clamping rod; 622 is a second electrode block; 63 is a driven rotating plate; 631 is an arc-shaped air vent hole; 632 is a bayonet; 64 is a fixed cover plate; 641 is an arc-shaped ventilation hole; 642 is a first electrode plate; 7 is a high-temperature decomposition tower; 8 is a two-way vacuum pump; 9 is a drive motor; 91 is a driving gear; 92 is a chain; 10 is a fixed rod; 101 is a protective cover; 102 is a second electrode plate; 11 is a stirring assembly. Detailed implementation manners

[0033] The following will cooperate with the drawings and embodiments to detail the implementation manners of the present application, so as to fully understand how the present application uses technical means to solve technical problems and achieve the implementation process of technical effects and implement accordingly.

[0034] As Figure 1 - Figure 6 As shown, a medium and small-sized biogas hydrogen production device provided in this embodiment includes a biogas digester 1 and a first three-way pipe 2 fixedly installed on the biogas digester 1. A support frame 3 is fixedly arranged on one side of the biogas digester 1, and two symmetrically distributed dry desulfurization towers 4 are fixedly installed above the support frame 3. An air inlet pipe 5 is fixedly arranged on the side of the dry desulfurization tower 4 corresponding to the biogas digester 1. One end of the first three-way pipe 2 far from the biogas digester 1 is fixedly connected to the air inlet pipe 5. The dry desulfurization tower 4 is communicated with the inside of the biogas digester 1 through the first three-way pipe 2. The biogas digester 1 is used for fermenting waste, and the first three-way pipe 2 is used for connecting the biogas digester 1 and the two dry desulfurization towers 4;

[0035] Two symmetrically distributed air outlet pipes 41 are fixedly arranged at the upper end of the dry desulfurization tower 4. A second three-way pipe 6 is fixedly connected to the air outlet pipe 41. A high-temperature decomposition tower 7 is fixedly arranged on one side of the dry desulfurization tower 4. One end of the second three-way pipe 6 far from the dry desulfurization tower 4 extends into the inside of the high-temperature decomposition tower 7. A U-shaped air exchange pipe 42 is fixedly connected to the air outlet pipe 41 close to the first three-way pipe 2. The U-shaped air exchange pipe 42 extends to the bottom side of the air inlet pipe 5. A two-way vacuum pump 8 is fixedly arranged on the U-shaped air exchange pipe 42. The interiors of the two dry desulfurization towers 4 are communicated through the U-shaped air exchange pipe 42. The U-shaped air exchange pipe 42 is used for discharging the residual gas inside the dry desulfurization tower 4 that needs to replace the adsorbent. The second three-way pipe 6 is used for connecting the two dry desulfurization towers 4 and the high-temperature decomposition tower 7;

[0036] Among them, the first three-way pipe 2 is used to connect the biogas digester 1 and two dry desulfurization towers 4. The U-shaped gas exchange pipe 42 is used to discharge the residual gas inside the dry desulfurization tower 4 that needs to replace the adsorbent. The second three-way pipe 6 is used to connect the two dry desulfurization towers 4 and the high-temperature decomposition tower 7. By combining the two dry desulfurization towers 4, the purpose of circulating desulfurization is achieved. After the adsorbent in one side of the dry desulfurization tower 4 is saturated, the flow direction of the biogas can be changed through the first three-way pipe 2 and the second three-way pipe 6, and then the residual biogas and hydrogen sulfide on the other side are pumped into the biogas channel through the two-way vacuum pump 8, thereby greatly reducing the probability of hydrogen sulfide leakage, reducing the corrosion degree of the internal parts of the hydrogen production device by hydrogen sulfide, and at the same time, it can also alleviate the environmental pollution caused by the sulfide decomposed by the high-temperature decomposition tower 7.

[0037] Further, as Figure 1 - Figure 8 shown, two symmetrically distributed butterfly valves 21 are fixedly installed on the first three-way pipe 2. The butterfly valves 21 correspond to the inlet pipes 5 one by one. The valve stem 22 of the butterfly valve 21 penetrates through the first three-way pipe 2 and extends to both sides of the butterfly valve 21. A driven gear 23 is fixedly installed at the bottom end of the valve stem 22. A driving motor 9 is fixedly installed at the bottom end of the support frame 3. The output end of the driving motor 9 penetrates through the support frame 3 and extends above the support frame 3. A driving gear 91 is fixedly installed at the output end of the driving motor 9. A chain 92 is meshed on the outside of the driving gear 91. The chain 92 is meshed with the driven gears 23 on both sides of the first three-way pipe 2;

[0038] Among them, the driving motor 9 is used to drive the driven gear 23 to rotate through the driving gear 91 and the chain, and then close one of the butterfly valves 21 and open the other butterfly valve 21 through the valve stem 22, thereby achieving the purpose of changing the flow direction of the biogas;

[0039] It should be noted that: the initial positions of the valve cores of the two butterfly valves 21 are different. At this time, through the transmission of the driving motor 9, the opening and closing states of the two butterfly valves 21 can be different. The maximum rotation angle of the valve stem 22 is 90 degrees, which is convenient for the installation and transmission of the driving motor 9.

[0040] Even further, as Figure 1 - Figure 8As shown in the figure, a luminol test kit 43 is fixedly arranged inside the gas outlet pipe 41 near the pyrolysis tower 7. The luminol test kit 43 is honeycomb-shaped. A photoresistor 61 is fixedly installed at the position of the second three-way pipe 6 corresponding to the luminol test kit 43. A synchronous motor 62 is fixedly arranged at the upper end of the photoresistor 61. The synchronous motor 62 is electrically connected to the photoresistor 61 through a wire. Both ends of the photoresistor 61 are connected in series to the power supply circuit of the synchronous motor 62 through wires. A driven rotating plate 63 is clamped at the output end of the synchronous motor 62. A number of evenly distributed arc-shaped air exchange holes 631 are formed on the driven rotating plate 63. A fixed cover plate 64 is fixedly installed inside the second three-way pipe 6. A number of evenly distributed arc-shaped ventilation holes 641 are formed on the fixed cover plate 64. The arc-shaped ventilation holes 641 correspond to the arc-shaped air exchange holes 631;

[0041] Among them, after the adsorbent inside one dry desulfurization tower 4 is saturated, the excess hydrogen sulfide that cannot be absorbed will enter the gas outlet pipe 41 along with the flow of biogas. At this time, a photochemical reaction occurs between the hydrogen sulfide and the luminol inside the luminol test kit 43. The photoresistor 61 senses the light source and the resistance drops, and the voltage of the synchronous motor 62 rises to start the transmission lever 621 and the driven rotating plate 63 to rotate. At this time, the arc-shaped air exchange holes 631 are staggered from the arc-shaped ventilation holes 641, closing one end of the second three-way pipe 6. At the same time, the synchronous motor 62 on the other side drives the driven rotating plate 63 to rotate so that the arc-shaped air exchange holes 631 communicate with the arc-shaped ventilation holes 641, realizing the conversion of the flow direction of biogas inside the second three-way pipe 6;

[0042] Luminol itself does not emit light in an alkaline environment, but when it coexists with certain oxidants and catalysts, it can emit strong blue light after being excited. When hydrogen sulfide passes through the luminol test kit 43, as a reducing agent, hydrogen sulfide can participate in this reaction process, thus triggering the luminescence of luminol. The concentration of hydrogen sulfide will directly affect the reaction rate and the generated luminescence intensity. Therefore, the start of the synchronous motor 62 can be realized by setting the sensitivity of the photoresistor 61. This is prior art and will not be elaborated here.

[0043] At the same time, as Figure 1 - Figure 8As shown in the figure, a clamping rod 621 is fixedly connected to the output end of the synchronous motor 62. Second electrode blocks 622 are fixedly arranged at both ends of the clamping rod 621. The second electrode blocks 622 are electrically connected to the positive and negative electrodes of an external power supply through wires. Two symmetrically distributed first electrode plates 642 are fixedly arranged inside the fixed cover plate 64. The two first electrode plates 642 are respectively electrically connected to the positive and negative electrodes of the driving gear 91 through wires. During the rotation of the driving clamping rod 621 and the driven rotating plate 63 of the synchronous motor 62 on one side, the second electrode block 622 contacts the first electrode plate 642, forming a circuit for the driving motor 9. At this time, the driving motor 9 is used to drive the driven gear 23 to rotate through the driving gear 91 and the chain to close the corresponding butterfly valve 21, and the butterfly valve on the other side is opened, thus realizing the change of the entire circulation direction of the biogas. No manual operation is required, which not only simplifies the control logic but also is fast and convenient;

[0044] In addition, as Figure 4 shown, a bayonet 632 is formed on the driven rotating plate 63. The clamping rod 621 passes through the bayonet 632 and extends above the driven rotating plate 63. The driven rotating plate 63 is engaged with the clamping rod 621 through the bayonet 632; this facilitates the clamping rod 621 to drive the driven rotating plate 63 to rotate and also facilitates the contact between the second electrode block 622 and the first electrode plate 642.

[0045] Furthermore, as Figure 1 - Figure 8 shown, a fixed rod 10 is fixedly installed on the upper side of the butterfly valve 21. A protective cover 101 is fixedly installed on the fixed rod 10. The valve stem 22 is rotatably arranged inside the protective cover 101. First electrode blocks 24 are fixedly installed on both sides of the butterfly valve 21. The two first electrode blocks 24 are respectively electrically connected to the positive and negative electrodes of an external power supply through wires. A second electrode plate 102 is fixedly installed inside the fixed rod 10. The second electrode plate 102 corresponds to the first electrode block 24. One ends of the two second electrode plates 102 are respectively electrically connected to the positive and negative electrodes of the power supply of the two-way vacuum pump 8 through wires. The protective cover 101 is used to protect the butterfly valve 21. On the one hand, it is used for dust and waterproof protection, and on the other hand, it can also prevent the short circuit between the second electrode plate 102 and the first electrode block 24;

[0046] Among them, after the arc-shaped ventilation hole 641 and the arc-shaped air exchange hole 631 are staggered, the driving motor 9 drives the butterfly valve 21 on one side to close and the butterfly valve 21 on the other side to open. At this time, after the valve stem 22 rotates, the second electrode plate 102 on one side contacts the first electrode block 24, and the two-way vacuum pump 8 is powered on and starts, and conveys the residual gas in the dry desulfurization tower 4 to the biogas conversion path on the other side through the U-shaped air exchange pipe 42, which can prevent the excess biogas and hydrogen sulfide from overflowing when replacing the adsorbent. On the one hand, it can save more and improve the hydrogen production efficiency, and on the other hand, it can also reduce environmental pollution;

[0047] It should be noted that: two first electrode blocks 24 are provided on each of the butterfly valves 21 at both ends, and the connection directions of the first electrode blocks 24 on the same valve stem 22 to the positive and negative poles of the external power supply are opposite. The connection directions of the two first electrode blocks 24 close to the biogas digester 1 to the positive and negative poles of the external power supply are opposite. By controlling the current input direction of the motor of the two-way vacuum pump 8, the gas input direction of the two-way vacuum pump 8 can be controlled, so that the flow direction of the residual biogas is consistent with the changing direction of the biogas.

[0048] To solve the problem of negative pressure in the dry desulfurization tower 4 when the two-way vacuum pump 8 is working:

[0049] As Figure 6 shown, a desulfurizer is fixedly installed on one side of the dry desulfurization tower 4 by bolts. The inside of the dry desulfurization tower 4 is connected to the outside through a replacement port 44. A sealing cover 45 is fixedly installed at the upper end of the dry desulfurization tower 4. A pressure sensor 46 is fixedly installed on the sealing cover 45. The pressure sensor 46 extends into the inside of the dry desulfurization tower 4. The pressure sensor 46 is electrically connected to an external control mechanism through a wire; the replacement port 44 is used to replace the adsorbent, and the sealing cover 45 is used to seal the dry desulfurization tower 4. During the operation of the two-way vacuum pump 8, the air pressure in the dry desulfurization tower 4 decreases. When the air pressure drops to a certain level, the pressure sensor 46 transmits the data to the control mechanism. At this time, the staff can turn off the two-way vacuum pump 8 and open the replacement port 44 to replace the adsorbent.

[0050] In addition, as Figure 1 shown, a stirring assembly 11 is fixedly installed at the upper end of the biogas digester 1. The output end of the stirring assembly 11 penetrates through the upper end of the biogas digester 1 and extends into the inside of the biogas digester 1, which can improve the output efficiency of biogas and continuously produce hydrogen.

[0051] As Figure 1 - Figure 8 shown, the principle of the medium and small-sized biogas hydrogen production device provided in this embodiment is as follows:

[0052] In use, after the adsorbent inside a dry desulfurization tower 4 becomes saturated, the excess hydrogen sulfide that cannot be absorbed will flow into the outlet pipe 41 along with the flow of biogas. At this time, a photochemical reaction occurs between the hydrogen sulfide and the luminol inside the luminol kit 43. The photosensitive resistor 61 senses the light source and its resistance decreases, and the voltage of the synchronous motor 62 increases to start the rotation of the driving lever 621 and the driven rotating plate 63. At this time, the arc-shaped ventilation hole 631 is offset from the arc-shaped air vent hole 641, closing one end of the second three-way pipe 6. At the same time, the synchronous motor 62 on the other side drives the driven rotating plate 63 to rotate, causing the arc-shaped ventilation hole 631 to communicate with the arc-shaped air vent hole 641. At this time, the driving motor 9 drives the butterfly valve 21 on one side to close and the butterfly valve 21 on the other side to open. At this time, after the valve stem 22 rotates, the second electrode plate 102 on one side contacts the first electrode block 24, and the two-way vacuum pump 8 is powered on and started, and the residual gas in the dry desulfurization tower 4 is transported to the biogas conversion path on the other side through the U-shaped air pipe 42. When the air pressure in the dry desulfurization tower 4 drops to a certain level, the pressure sensor 46 transmits the data to the control mechanism. At this time, the staff can turn off the two-way vacuum pump 8 and open the replacement port 44 to replace the adsorbent.

[0053] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. As mentioned throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve the technical effects.

[0054] It should be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a commodity or system. Without further limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the commodity or system including the element.

[0055] The above description shows and describes several preferred embodiments of the present invention. However, as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A medium and small-sized biogas hydrogen production device, comprising a biogas digester (1) and a first three-way pipe (2) fixedly installed on the biogas digester (1), characterized in that: One side of the biogas digester (1) is fixedly provided with a support frame (3). Above the support frame (3), two symmetrically distributed dry desulfurization towers (4) are fixedly installed. On the side of the dry desulfurization tower (4) corresponding to the biogas digester (1), an air inlet pipe (5) is fixedly provided. One end of the first three-way pipe (2) away from the biogas digester (1) is fixedly connected to the air inlet pipe (5). The dry desulfurization tower (4) is connected to the inside of the biogas digester (1) through the first three-way pipe (2). At the upper end of the dry desulfurization tower (4), two symmetrically distributed air outlet pipes (41) are fixedly provided. A second three-way pipe (6) is fixedly connected to the air outlet pipe (41). On one side of the dry desulfurization tower (4), a high-temperature decomposition tower (7) is fixedly provided. One end of the second three-way pipe (6) away from the dry desulfurization tower (4) extends into the inside of the high-temperature decomposition tower (7). An inverted U-shaped air exchange pipe (42) is fixedly connected to the air outlet pipe (41) near the first three-way pipe (2). The inverted U-shaped air exchange pipe (42) extends to the bottom side of the air inlet pipe (5). A two-way vacuum pump (8) is fixedly provided on the inverted U-shaped air exchange pipe (42). The interiors of the two dry desulfurization towers (4) are connected through the inverted U-shaped air exchange pipe (42). Two symmetrically distributed butterfly valves (21) are fixedly installed on the first three-way pipe (2). At the bottom end of the valve stem (22) of the butterfly valve (21), a driven gear (23) is fixedly installed. At the bottom end of the support frame (3), a driving motor (9) is fixedly installed. At the output end of the driving motor (9), a driving gear (91) is fixedly installed. A chain (92) is meshed on the outside of the driving gear (91). The chain (92) is meshed with the driven gears (23) on both sides of the first three-way pipe (2). A luminol test kit (43) is fixedly provided inside the air outlet pipe (41) near the high-temperature decomposition tower (7). A photoresistor (61) is fixedly installed at the position of the second three-way pipe (6) corresponding to the luminol test kit (43). At the upper end of the photoresistor (61), a synchronous motor (62) is fixedly provided. The synchronous motor (62) is electrically connected to the photoresistor (61) through a wire. At the output end of the synchronous motor (62), a driven rotating plate (63) is snap-fitted. A number of uniformly distributed arc-shaped air exchange holes (631) are formed in the driven rotating plate (63). A fixed cover plate (64) is fixedly installed inside the second three-way pipe (6). A number of uniformly distributed arc-shaped ventilation holes (641) are formed in the fixed cover plate (64). A clamping rod (621) is fixedly connected to the output end of the synchronous motor (62). Second electrode blocks (622) are fixedly arranged at both ends of the clamping rod (621). The second electrode blocks (622) are electrically connected to the positive and negative electrodes of an external power supply through wires. Two symmetrically distributed first electrode plates (642) are fixedly arranged inside the fixed cover plate (64). The two first electrode plates (642) are respectively electrically connected to the positive and negative electrodes of the driving gear (91) through wires; A bayonet (632) is formed on the driven rotating plate (63). The clamping rod (621) penetrates through the bayonet (632) and extends above the driven rotating plate (63).

2. The medium and small-sized biogas hydrogen production device according to claim 1, characterized in that: The butterfly valves (21) correspond to the intake pipes (5) one by one. The valve stem (22) of the butterfly valve (21) penetrates through the first three-way pipe (2) and extends to both sides of the butterfly valve (21).

3. The medium and small-sized biogas hydrogen production device according to claim 2, characterized in that: The output end of the driving motor (9) penetrates through the support frame (3) and extends above the support frame (3).

4. The medium and small-sized biogas hydrogen production device according to claim 3, wherein: The arc-shaped ventilation holes (641) correspond to the arc-shaped air exchange holes (631).

5. A medium and small-sized biogas hydrogen production device according to claim 1, characterized in that: The driven rotating plate (63) is engaged with the clamping rod (621) through the bayonet (632).

6. A medium and small-sized biogas hydrogen production device according to claim 1, characterized in that: A fixed rod (10) is fixedly installed on the upper side of the butterfly valve (21). A protective cover (101) is fixedly installed on the fixed rod (10). The valve stem (22) is rotatably arranged inside the protective cover (101).

7. The medium and small-sized biogas hydrogen production device according to claim 6, wherein: First electrode blocks (24) are fixedly installed on both sides of the butterfly valve (21). The two first electrode blocks (24) are respectively electrically connected to the positive and negative electrodes of an external power supply through wires. A second electrode plate (102) is fixedly installed inside the fixed rod (10). The second electrode plate (102) corresponds to the first electrode block (24). One ends of the two second electrode plates (102) are respectively electrically connected to the positive and negative electrodes of the power supply of the two-way vacuum pump (8) through wires.

8. A medium and small-sized biogas hydrogen production device according to claim 1, characterized in that: A replacement port (44) is fixedly installed on one side of the dry desulfurization tower (4) through bolts. The inside of the dry desulfurization tower (4) is communicated with the outside through the replacement port (44). A sealing cover (45) is fixedly installed at the upper end of the dry desulfurization tower (4). A pressure sensor (46) is fixedly installed on the sealing cover (45). The pressure sensor (46) extends into the dry desulfurization tower (4). The pressure sensor (46) is electrically connected to an external control mechanism through a wire.

9. The medium and small-sized biogas hydrogen production device according to claim 1, wherein: A stirring assembly (11) is fixedly installed at the upper end of the biogas digester (1). The output end of the stirring assembly (11) penetrates through the upper end of the biogas digester (1) and extends into the biogas digester (1).

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