Thermal chemical sulfur-iodine circulating hydrogen production HIx phase purification device

Abstract

The invention discloses a thermochemical sulfur-iodine circulating hydrogen production HIx phase purification device, which belongs to sulfur-iodine circulating hydrogen production equipment and is characterized in that two outlets of an adopted filter are respectively connected with a hydroiodic acid distillation tower and a barium sulfate decomposition tower, a liquid inlet bin is mounted on the outer top surface of a filtering bin of the filter, and a driving water wheel is arranged in the liquid inlet bin; a liquid inlet pipeline is arranged above one side of the driving water wheel, a rotating shaft which is in transmission connection with the driving water wheel is rotationally mounted behind the other side of the driving water wheel, a strip-shaped through hole is formed in one side of the conical filter cover in the generatrix direction of the conical filter cover, and a material receiving groove which is obliquely arranged downwards and can swing downwards is formed below the strip-shaped through hole; and a scraping plate is fixed to the side face of the rotating shaft, and when the scraping plate rotates along with the rotating shaft and gets close to the strip-shaped penetrating hole, the driving assembly drives the material receiving groove to rotate downwards by an angle, so that sediment gathered in the material receiving groove continues to slide downwards. According to the invention, barium sulfate in the hydrogen production process can be dynamically, continuously and fully filtered and separated.

Description

Technical Field

[0001] The present invention relates to a hydrogen production device by sulfur-iodine cycle, specifically a purification device for the HIx phase in the thermochemical sulfur-iodine cycle for hydrogen production. Background Art

[0002] Hydrogen production by sulfur-iodine cycle is a hydrogen production method based on thermochemical cycle, aiming to efficiently produce hydrogen from water using a series of chemical reactions. It has the significant advantage of zero carbon emissions and is regarded as one of the important technical paths for hydrogen production in the future sustainable energy system. Hydrogen production by sulfur-iodine cycle mainly includes the Bunsen reaction, sulfuric acid decomposition reaction, and hydroiodic acid decomposition reaction. Through these three-step reactions, sulfur and iodine play the role of catalysts in the whole process, continuously participating in the reaction in a cycle, and the net reaction result is to decompose water into hydrogen and oxygen. This technology uses water as the only raw material, and no greenhouse gas emissions are generated during the whole hydrogen production process, which is environmentally friendly and meets the energy demand of sustainable development.

[0003] Compared with the traditional electrolytic water hydrogen production method, hydrogen production by sulfur-iodine cycle can achieve higher energy conversion efficiency under suitable conditions. It uses thermal energy to drive chemical reactions and can make full use of various heat sources, such as nuclear energy, solar heat, etc., and theoretically can reach a relatively high hydrogen production efficiency.

[0004] For the above reasons, those skilled in the art have conducted in-depth research on the sulfur-iodine cycle hydrogen production technology. During the whole reaction process, catalyst sulfur poisoning is one of the key factors affecting hydrogen production efficiency. In short, sulfur is the most common and also the most difficult to completely remove poison for the catalyst. It can react with the active components of the catalyst, resulting in a decrease or even inactivation of the catalyst activity, and the poisoning sign of the catalyst can occur even when the sulfur content is extremely low. Those skilled in the art have conducted various studies for this. For example, the Chinese patent with the publication number CN116143079A records a method and device for purifying the HIx phase in the thermochemical sulfur-iodine cycle for hydrogen production. In this prior art, excessive Ba 2+ is sent into the HIx phase purification tower to react with sulfuric acid to form BaSO4 precipitate, achieving the purpose of removing sulfuric acid impurities and purifying the HIx solution. And the generated BaSO4 decomposes again into BaO, O2 and SO2 in a high-temperature environment. BaO reacts with HI in a mixer to form BaI2 solution, which is convenient for pipeline transportation, and at the same time realizes the recycling of Ba. The generated high-temperature O2 and SO2 gases enter the BaSO4 decomposition tower, providing part of the energy for the H2SO4 decomposition reaction. The efficient removal of sulfuric acid well avoids the risk of subsequent S poisoning of the HI decomposition catalyst without consuming iodine, ensuring the long-term continuous operation of the system.

[0005] Therefore, in the entire process chain of hydrogen production by the sulfur-iodine cycle, the separation and removal of BaSO4 precipitation in the HIx-phase purification tower of the sulfur-iodine cycle are extremely important, which directly relates to the degree of reduction of the risk of catalyst S poisoning. In the prior art, in the filtration equipment for BaSO4 precipitation in this reaction system, multi-layer filter elements are often used for filtration. As the reaction progresses, more and more barium sulfate will cover the surface of the filter element, resulting in a gradual decrease in the filtration capacity of barium sulfate during the entire reaction process and unstable filtration performance, which will have a great impact on the uniform stability of the entire hydrogen production reaction. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a HIx-phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle. This HIx-phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle can dynamically and continuously and fully filter and separate barium sulfate, which is beneficial to maintaining the continuous and stable operation of the entire hydrogen production reaction system.

[0007] To achieve the above object, the present invention provides the following technical solution: A HIx-phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle, including a separation tower, a HIx-phase purification tower, a barium sulfate decomposition tower, a filter, and a hydroiodic acid distillation tower. The heavy liquid phase outlet of the separation tower is connected to the HIx-phase purification tower, and the two outlets of the filter are respectively connected to the hydroiodic acid distillation tower and the barium sulfate decomposition tower; the filter includes a filter chamber, and a liquid inlet chamber is installed on the outer top surface of the filter chamber. A driving water wheel is provided in the liquid inlet chamber. An inlet pipeline is provided above one side of the driving water wheel, and a rotating shaft drivingly connected to the driving water wheel is rotatably installed behind the other side of the driving water wheel. The rotating shaft is located on the axis of a conical filter cover installed in the upper part of the filter chamber, and the opening of the conical filter cover faces upward; A strip-shaped perforation is provided on one side of the conical filter cover along its generatrix direction, and a receiving groove arranged obliquely downward is provided below the strip-shaped perforation. The receiving groove is connected to a driving assembly, and the whole receiving groove adopts the same hollow structure as the conical filter cover; A scraper is fixed on the side surface of the rotating shaft. When the scraper rotates with the rotating shaft, it can scrape up the sediment on the surface of the conical filter cover, and when it is close to the strip-shaped perforation, the driving assembly drives the receiving groove to rotate downward by an angle so that the sediment accumulated in the receiving groove continues to slide downward.

[0008] Furthermore, a secondary filter cover fixed in the filter chamber is also provided around the lower part of the receiving groove. The secondary filter cover can filter out finer sediment than the conical filter cover, and the secondary filter cover is also inclined. A spiral conveyor shaft is installed obliquely at the inner bottom of the secondary filter cover. A discharge hole is opened at the bottom of the secondary filter cover at the bottom end of the spiral conveyor shaft, and the discharge hole is connected to the barium sulfate decomposition tower.

[0009] Further, a fine filter plate is horizontally fixed at the bottom of the filtration chamber. A drain pipe is installed on the side wall of the filtration chamber below the fine filter plate, and the drain pipe is connected to the hydroiodic acid distillation column.

[0010] Further, the inlet pipe is vertically installed at the top of one side of the liquid inlet chamber, and the inlet pipe is connected to the heavy liquid phase outlet of the separation column.

[0011] Further, the driving water wheel includes a wheel body, a wheel shaft, and a worm gear. The wheel body is fixed on the wheel shaft, and the worm gear is fixed on the wheel shaft; a worm is coaxially fixed on the part of the rotating shaft exposed above the top of the filtration chamber, and the worm meshes with the worm gear.

[0012] Further, the wheel shaft includes a first shaft and a second shaft. The first shaft is used to fix the wheel body, and the second shaft is used to fix the worm gear; a connecting seat is fixed at the end of the first shaft. The inner cavity of the connecting seat is a cylindrical cavity, and a closed ring for the second shaft to pass through is fixedly installed at the cavity opening end. A frustum is fixed at one end of the second shaft located inside the cylindrical cavity. One end of the frustum is in pressing contact with the bottom of the cylindrical cavity through a disc spring, and a stud is rotatably installed at the other end. The stud is arranged parallel to the second shaft and is in threaded cooperation with the closed ring.

[0013] Further, a plurality of studs are provided and are annularly arrayed around the second shaft. A cylindrical gear is fixed at the end of each stud, and the cylindrical gear meshes with an internal gear ring rotatably installed on the connecting seat.

[0014] Further, a ring sleeve is integrally connected to the outside of the internal gear ring. One end of the ring sleeve is screwed and sleeved on the outer side wall of the connecting seat; an abutting spring is axially installed in the inner wall of the ring sleeve, and one end of the abutting spring exposed outside the inner wall of the ring sleeve is in pressing contact with the end face of the closed ring.

[0015] Furthermore, the driving assembly includes a bent shaft fixed at the bottom of the material receiving trough near the top, a connecting rod is fixed in the radial direction of the bent shaft, the connecting rod is fixed on the main shaft of a motor, and the motor is installed on the back of the filter bin; the free end of the bent shaft is slidably inserted into a concentrically arranged bent pipe, the bent pipe is fixed in the filter bin, and an arc spring is installed in the bent pipe, and the arc spring is connected to the free end of the bent shaft; it also includes a No. 1 conductor, a No. 2 conductor, a reset spring and an insulating slider, the reset spring is non-contactingly sleeved on the outside of the No. 2 conductor, and the free end of the reset spring is connected to the No. 1 conductor, so that the two conductors do not contact each other under normal conditions; the No. 1 conductor is fixed as a whole with one end of the insulating slider, and the other end of the insulating slider is exposed from the top surface of the filter bin under normal conditions, and the exposed top surface of the insulating slider has a convex arc surface, so that the scraper is squeezed into contact with the arc surface and the insulating slider is completely squeezed into the inner top wall of the filter bin. During the time period, the No. 1 conductor and the No. 2 conductor always keep in contact with each other.

[0016] Furthermore, the insulating slider is a fan-shaped block structure, the radial edge on the left side of its bottom end has a chamfered corner to form the arc surface, and the remaining bottom end surface is a horizontal end surface. When the top end of the scraper partially slides on the horizontal end surface, the No. 1 conductor and the No. 2 conductor always remain in contact with each other.

[0017] Beneficial effects: The present invention provides a thermochemical sulfur-iodine cycle hydrogen production HIx phase purification device, which has the following beneficial effects: the present invention has a simple and reliable structure, and in order to ensure the HIx phase purification effect, the barium sulfate precipitate is fully filtered out through a special filter to avoid sulfur poisoning of the catalyst in the hydrogen production reaction when a large amount of sulfur remains in the mixture of HI and BaI2. The thermochemical sulfur-iodine cycle hydrogen production HIx phase purification device can filter out the barium sulfate precipitate well, remove the influence of the S element on the catalyst, and dynamically scrape off the barium sulfate precipitate, avoiding as much as possible the problem of blockage caused by the barium sulfate covering the filter element, ensuring that the filtration of barium sulfate is continuous and sufficient in the entire hydrogen production process chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure in the filter bin of the present invention; Figure 2 The installation structure diagram for driving the water wheel; Figure 3 A schematic diagram of a friction contact structure of a wheel axle; Figure 4 for Figure 1 The enlarged view of point A in the middle; Figure 5 for Figure 4A specific matching structure diagram of two conductors in; Figure 6 for Figure 5 A bottom view of a specific structure of conductor No. 1 in FIG.

[0019] In the figure: filter bin 1, conical filter cover 2, liquid inlet bin 3, liquid inlet pipeline 4, driving water wheel 5, wheel body 6, wheel axle 7, first shaft 701, second shaft 702, connecting seat 8, ring sleeve 9, cylindrical gear 10, worm wheel 11, worm 12, rotating shaft 13, scraper 14, strip perforation 15, material receiving trough 16, spiral conveying shaft 17, secondary filter cover 18, discharge hole 19, fine filter plate 20, disc spring 21, round table 22, stud 23, resistance spring 24, inner gear ring 25, closed ring 26, bent shaft 27, connecting rod 28, motor 29, bent pipe 30, arc spring 31, insulating slider 32, arc surface 3201, horizontal end surface 3202, No. 1 conductor 33, reset spring 34, No. 2 conductor 35, discharge pipe 36. DETAILED DESCRIPTION

[0020] This specification will clearly and completely express the technical solutions in the following examples based on the drawings of the embodiments of the present invention. The implementation methods described in this specification are only some of the embodiments of the present invention, not all of them. All other embodiments extended and inspired by those skilled in the art based on these embodiments in this application without creative work should fall within the scope of protection of the present invention.

[0021] like Figure 1A hydrogen iodide (HIx) phase purification device for thermochemical sulfur-iodine cycle hydrogen production is shown. The specific structure includes a separation tower, an HIx phase purification tower, a barium sulfate decomposition tower, a filter, and a hydroiodic acid distillation tower. The separation tower is mainly for liquid-liquid separation, that is, separating liquids with different densities. The heavy liquid phase outlet in it outputs the HIx phase liquid, that is, connecting the liquid phase outlet to an inlet of the HIx phase purification tower to input the HIx phase liquid. The filter in this embodiment has two outlets and one inlet. This inlet is used to receive the mixture of HI, BaI2, and BaSO4 discharged from the HIx phase purification tower. The two outlets need to be connected to the hydroiodic acid distillation tower and the barium sulfate decomposition tower respectively. When connected to the hydroiodic acid distillation tower, it outputs the mixture of HI and Bal2. Connecting to the barium sulfate decomposition tower is to output the barium sulfate precipitate obtained by reaction in the HIx phase purification tower, thereby removing sulfur and avoiding the risk of catalyst S poisoning during the corresponding hydrogen production reaction process. Specifically, the filter in this embodiment includes a filter chamber 1. The inside of the filter chamber 1 is mainly used to filter out BaSO4 from the mixture of HI, BaI2, and BaSO4. Specifically, a liquid inlet chamber 3 is installed on the outer top surface of the filter chamber 1. A driving water wheel 5 is provided in the liquid inlet chamber 3. Above one side of the driving water wheel 5 is a liquid inlet pipe 4. Specifically, the liquid inlet pipe 4 can be vertically installed at the top of one side of the liquid inlet chamber 3. The liquid inlet pipe 4 is connected to the heavy liquid phase outlet of the separation tower so that when the mixed liquid flows down, it impacts the driving water wheel 5 to make the driving water wheel 5 rotate self - sufficiently. Behind the other side of the driving water wheel 5, a rotating shaft 13 is rotatably installed and is in transmission connection with the driving water wheel 5. This rotating shaft 13 is located on the axis of a conical filter cover 2 installed in the upper part of the filter chamber 1, and the opening of the conical filter cover 2 faces upward for filtering. In addition, in this embodiment, on one side of the conical filter cover 2, a strip - shaped perforation 15 is provided along its generatrix direction. Below this strip - shaped perforation 15 is a receiving trough 16 arranged obliquely downward. The receiving trough 16 is located below the strip - shaped perforation 15 to form a split - type filtering element together with the conical filter cover 2. At the same time, this receiving trough 16 is connected to a driving assembly. The receiving trough 16 as a whole has the same hollow structure as the conical filter cover 2 to achieve filtering. On the other hand, in this embodiment, a scraper 14 is fixed on the side surface of the rotating shaft 13. The scraper 14 can be provided with several small holes on its surface. When the scraper 14 rotates with the rotating shaft 13, it can scrape the precipitate on the surface of the conical filter cover, that is, scrape off barium sulfate and continue to rotate and push it. When approaching the strip - shaped perforation 15, it makes the accumulated barium sulfate flow into the strip - shaped perforation 15 concentratedly and fall into the above - mentioned receiving trough 16 for temporary storage. Moreover, as Figure 1 , the aforementioned driving assembly can drive the receiving trough 16 to rotate downward by an angle, that is, the receiving trough 16 rotates downward to Figure 1At the position indicated by the dashed line in [description], the accumulated sediment in the material receiving tank 16 slides downward continuously to concentrate the collection of barium sulfate precipitate. During use, the driving water wheel 5 rotates by the impact of the mixed liquid flowing out of the liquid inlet pipe 4. This not only saves energy consumption, but more importantly, the rotation speed of the driving water wheel 5 is relatively slow. This is mainly to facilitate the filtration and accumulation of sufficient barium sulfate on the aforementioned conical filter cover 2 for the mixture of HI, BaI2, and BaSO4 generated by the HIx phase purification tower. So that during the process of the scraper 14 scraping one circle, more barium sulfate can be scraped up and then fall into the strip-shaped perforations 15, avoiding frequent scraping, which may cause only a small amount of barium sulfate precipitate to be carried by the scraper 14 each time, resulting in the idling of the scraper 14. In addition, when the filter in this device is working, the barium sulfate precipitate filtered out on the conical filter cover 2 slides downward to the cone bottom and then centrally falls into the aforementioned material receiving tank 16 through the strip-shaped perforations 15. Therefore, even if the scraper 14 has not reached the strip-shaped perforations 15, a relatively large amount of barium sulfate precipitate has already accumulated in the material receiving tank 16, ensuring that enough barium sulfate is discharged each time the material receiving tank 16 is turned downward.

[0022] To improve the filterability, as Figure 1 shown, a secondary filter cover 18 fixed in the filter chamber 1 is also provided around the lower part of this material receiving tank 16. This secondary filter cover 18 can filter out finer precipitates than the conical filter cover 2. Its specific shape and size are determined according to the material receiving tank 16 above it, and it is required to thoroughly receive the liquid leaking from the receiving tank to achieve secondary filtration. Since the liquid flowing down from the material receiving tank 16 is rich in barium sulfate, it is very likely that more barium sulfate remains compared to the other parts of the conical filter cover 2, so an additional filtration is needed. When installing the above-mentioned secondary filter cover 18, it is also inclined like the material receiving tank 16. An auger conveyor shaft 17 can be installed obliquely at the inner bottom of the secondary filter cover 18 to actively discharge barium sulfate. At the bottom of the secondary filter cover 18 at the bottom end of the auger conveyor shaft 17, a discharge hole 19 is also specifically opened for the centralized discharge of barium sulfate. That is, this discharge hole 19 is connected to the barium sulfate decomposition tower to input the purified barium sulfate precipitate into the barium sulfate decomposition tower, where it is decomposed again to obtain BaO, SO2, and O2. Then, BaO is input into the mixer to mix and obtain a mixed liquid of HI and BaI2, thus providing sufficient Ba for the reaction in the HIx phase purification tower and realizing the recycling of Ba, continuously providing reaction raw materials to avoid catalyst S poisoning.

[0023] As Figure 1As shown, in this embodiment, a fine filter plate 20 can also be horizontally fixed at the bottom of the filtration chamber 1. This fine filter plate 20 has excellent filtration performance and can filter out fine barium sulfate particles, filtering out barium sulfate to a greater extent. In addition, a drain pipe 36 is specifically installed on the side wall of the filtration chamber 1 below the fine filter plate 20. This drain pipe 36 discharges the mixed solution of HI and BaI2, that is, transports HI and BaI2 into the hydroiodic acid distillation tower for purification to obtain distilled HI and BaI2, and then inputs them into the mixer to provide raw materials for desulfurization (generating barium sulfate) for the HIx phase purification tower.

[0024] As one of the specific implementation structures, as Figure 2 shown, the drive water wheel 5 in this embodiment includes a wheel body 6, a wheel shaft 7, and a worm gear 11. The wheel body 6 is fixed on the wheel shaft 7, and the worm gear 11 is fixed on the wheel shaft 7. The part of the rotating shaft 13 exposed above the top of the filtration chamber 1 is coaxially fixed with a worm 12. The worm 12 meshes with the worm gear 11, thereby realizing the rotation of the drive water wheel 5 driving the rotation of the rotating shaft 13, that is, driving the scraper 14 to rotate and scrape up the barium sulfate precipitate on the inner wall of the conical filter cover 2. More specifically, in order to better adjust and control the rotation of the scraper 14, as Figures 2 - 3The present wheel shaft 7 includes a first shaft 701 and a second shaft 702. The first shaft 701 is used to fix the wheel body 6, and the second shaft 702 is used to fix the worm gear 11, that is, the wheel shaft 7 is not formed in one piece. In order to connect the two shafts, a connecting seat 8 can be fixed at the end of the first shaft 701. The inner cavity of the connecting seat 8 is a cylindrical cavity, and a closed ring 26 for the second shaft 702 to pass through is fixedly installed at the cavity mouth end. The two can be fixed by bolts, etc. In addition, a truncated cone 22 is fixed at one end of the second shaft 702 located in the cylindrical cavity. The truncated cone 22 is axially slidably matched with the cylindrical cavity, and one end of the truncated cone 22 is squeezed and contacted with the bottom of the cylindrical cavity through the disc spring 21. A stud 23 is rotatably installed at the other end. The stud 23 is arranged parallel to the second shaft 702 and is threadedly matched with the closed ring 26. Rotating the stud 23 can change the contact tightness between the truncated cone 22 and the connecting seat 8, that is, the maximum static friction between the two can be changed. The transmission between the two shafts is mainly friction transmission. The greater the friction, the higher the transmission efficiency. When the friction When the force is large enough, the two shafts rotate synchronously, that is, the two shafts are out of the relative slipping motion state; therefore, when the speed of the scraper 14 is to be increased, that is, the speed of the rotating shaft 13 is to be increased, the stud 23 can be further screwed in, so that the friction between the two shafts will increase, so that when the water wheel 5 is driven to rotate, the speed of the second shaft 702 will also be greater; on the contrary, if the stud 23 is screwed out, the disc spring 21 is further released, the friction between the two shafts is reduced, and the speed of the second shaft 702 is also reduced, or objectively speaking, the looser the connection between the two shafts, the more severe the relative slippage during rotation. Through this special installation structure, the rotation speed of the scraper 14 can be fine-tuned according to different reactant dosages, that is, different amounts of heavy liquid phase, so that the rotation frequency of the scraper 14 fully matches the amount of barium sulfate deposited on the conical filter cover 2, and the barium sulfate can be better concentrated and discharged.

[0025] In the above embodiments, Figure 3 As shown, there are actually multiple studs 23, and these studs 23 are arranged in an annular array around the second shaft 702. A cylindrical gear 10 is fixed at the end of each stud 23. The cylindrical gear 10 is meshed with the inner gear ring 25 rotatably mounted on the connecting seat 8. The rotating gear ring can rotate with all the cylindrical gears 10 and move axially at the same time to adjust the strength of the above-mentioned friction transmission. In addition, the truncated table 22 is more evenly stressed and the overall structure is more reliable. In order to maintain the corresponding structural state when adjusting in place, a ring sleeve 9 is integrally connected to the outer side of the inner gear ring 25. One end of the ring sleeve 9 is screwed on the outer side wall of the connecting seat 8 in a threaded manner so that when rotating in place, it can maintain a relatively stable position and is not easy to misoperate. In order to improve the position stability of each stud 23 when adjusting in place, a resistance spring 24 is axially installed in the inner wall of the above-mentioned ring sleeve 9. The end of the resistance spring 24 exposed outside the inner wall of the ring sleeve 9 is pressed and contacted with the end face of the closed ring 26, so that the ring sleeve 9 is firmly installed.

[0026] In the above embodiments, as Figure 1 and Figure 4 shown, its driving component includes a bent shaft 27 fixed at the top near the bottom of the material receiving tank 16. A connecting rod 28 is fixed radially on this bent shaft 27. The connecting rod 28 is fixed on the main shaft of a motor 29, and the motor 29 is installed on the back of the filter chamber 1. In addition, the free end of the bent shaft 27 is slidably inserted into a concentrically arranged bent pipe 30. The bent pipe 30 is fixed in the filter chamber 1, and an arc-shaped spring 31 is installed in the bent pipe 30. The arc-shaped spring 31 is connected to the free end of the bent shaft 27. One of the purposes is to assist the motor to support the material receiving tank 16 together under normal conditions. At the same time, if the main shaft of the selected motor can rotate slightly under an external force outside the motor itself, once a large amount of sediment and liquid fall onto the material receiving tank 16, then the material receiving tank 16 will shake, which is not only beneficial for filtration but also can promote the sediment to slide downward. During use, the bent shaft 27 can rotate in a circular arc around the center of the bending path, and then the material receiving tank 16 swings in a circle around the above center. The reason for fixing it at the upper position near the bottom of the material receiving tank 16 is to better make the lower end of the material receiving tank 16 tilt downward, so as to expose a large enough gap between the material receiving tank 16 and the conical filter 2 for barium sulfate to be discharged downward intensively. The above-mentioned arc-shaped spring 31 needs to cooperate with the bent shaft 27 to make the material receiving tank 16 be in the position below the strip-shaped perforation 15 under normal conditions, and the outer wall of the material receiving tank 16 does not contact the outer wall of the conical filter 2, that is, there is a gap, so as to avoid the top of the material receiving tank 16 contacting and interfering with the outer wall of the conical filter 2 when the bottom end of the material receiving tank 16 rotates downward, so that it can swing downward and discharge barium sulfate at an appropriate time. The material receiving tank 16 can specifically be a slide structure with a rectangular cross-section, and the width of its opening is greater than the width of the strip-shaped perforation 15 to completely receive the sediment and liquid falling from the strip-shaped perforation 15, as Figure 1 , the bottom end is blocked by a corresponding component and closed. When the bottom end of the material receiving tank 16 swings downward driven by the bent shaft, the sediment is discharged downward.

[0027] As a specific design solution, as Figure 4As shown, this embodiment further includes a first conductor 33, a second conductor 35, a return spring 34, and an insulating slider 32. The return spring 34 is sleeved outside the second conductor 35 without contact. The second conductor 35 can be a metal column, and both the metal column and the first conductor 33 are connected to the wires of the corresponding circuit. That is, when the two conductors are in contact, the circuit is closed, and this circuit can be a working circuit for controlling the start of the motor 29. Specifically, the free end of the return spring 34 is connected to the first conductor 33, so that under normal conditions, the two conductors do not contact each other, that is, under normal conditions, the motor 29 does not work. The first conductor 33 is fixed integrally with one end of the insulating slider 32. The other end of the insulating slider 32 protrudes from the inner top surface of the filter chamber 1 under normal conditions, and the protruding top surface of the insulating slider 32 has a convex arc surface 3201 for contacting the top of the scraper 14 and squeezing the insulating slider 32. When the scraper 14 is in squeezing contact with the arc surface 3201, during the period when the insulating slider 32 is completely squeezed into the inner top wall of the filter chamber 1, the first conductor 33 and the second conductor 35 always remain in contact with each other. During this period, the motor 29 is powered on, and the receiving chute 16 swings downward to discharge the barium sulfate precipitate.

[0028] In order to keep the receiving chute 16 in the downward swinging state for a certain period of time, as Figures 5 - 6 shown, this insulating slider 32 is a sector-shaped block structure. The edge on the left side in the radial direction at the bottom end has a rounded corner to form the arc surface 3201 for contacting the top of the scraper 14. The rest of the bottom end surface of the insulating slider 32 is a horizontal end surface 3202. When the top of the scraper 14 slides in contact with the horizontal end surface 3202, the first conductor 33 and the second conductor 35 will always remain in contact with each other during this period, and then the motor 29 is always turned on, and the receiving chute 16 is continuously in the downward swinging discharging state during this period.

[0029] It should be explained here that in this specification, terms such as first and second are only used to distinguish one feature from another feature, and it does not mean that there is a certain relationship or order between these technical features. The terms "include" and "contain" mean containing a certain technical means or feature. Specifically, there are other existing or non-existing technical features that have not been listed. The discussions in the above embodiments are only illustrative examples for the present invention, and are by no means the only restrictive features. Those of ordinary skill in the art should understand that without departing from the technical content recorded in all the claims of this application, some simple substitutions and modifications can be made, so as to be changed or equivalently become other specific embodiments and application scenarios. However, no matter how adaptively changed, these embodiments will surely fall within the protection scope of the present invention.

Claims

1. A purification device for the HIx phase in the thermochemical sulfur-iodine cycle for hydrogen production, comprising a separation tower, an HIx phase purification tower, a barium sulfate decomposition tower, a filter, and a hydroiodic acid distillation tower. The heavy liquid phase outlet of the separation tower is connected to the HIx phase purification tower, and the two outlets of the filter are respectively connected to the hydroiodic acid distillation tower and the barium sulfate decomposition tower. It is characterized in that the filter includes a filter chamber (1), and a liquid inlet chamber (3) is installed on the outer top surface of the filter chamber (1). A driving water wheel (5) is rotatably arranged in the liquid inlet chamber (3). Above one side of the driving water wheel (5) is a liquid inlet pipe (4), and behind the other side of it, a rotating shaft (13) that is in transmission connection with the driving water wheel (5) is rotatably installed. The bottom end of the rotating shaft (13) penetrates through the filter chamber (1) and is located inside a conical filter cover (2) installed in the upper part of the filter chamber (1), and the opening of the conical filter cover (2) faces upward; along the generatrix direction of one side of the conical filter cover (2), there is a strip-shaped perforation (15), and below the strip-shaped perforation (15) is a receiving trough (16) arranged obliquely downward, and the receiving trough (16) can catch all the precipitates and liquids falling from the strip-shaped perforation (15); the receiving trough (16) is connected to a driving assembly, and the whole of the receiving trough (16) adopts the same hollow structure as the conical filter cover (2); a scraper (14) is fixed on the side surface of the rotating shaft (13). When the scraper (14) rotates with the rotating shaft (13), it can scrape up the precipitates on the surface of the conical filter cover (2), and when approaching the strip-shaped perforation (15), the driving assembly drives the receiving trough (16) to rotate downward by an angle, so that the precipitates accumulated in the receiving trough (16) continue to slide downward.

2. The HIx phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle according to claim 1, wherein around the lower part of the receiving trough (16), there is also a secondary filter cover (18) fixed in the filter chamber (1). The secondary filter cover (18) can filter out finer precipitates than the conical filter cover (2), and the secondary filter cover (18) is also inclined. A spiral conveyor shaft (17) is installed obliquely at the inner bottom of the secondary filter cover (18), and a discharge hole (19) is opened at the bottom cover of the secondary filter cover (18) at the bottom end of the spiral conveyor shaft (17), and the discharge hole (19) is connected to the barium sulfate decomposition tower.

3. The HIx phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle according to claim 1, characterized in that, a fine filter plate (20) is horizontally fixed at the bottom of the filter chamber (1). A drain pipe (36) is installed on the side wall of the filter chamber (1) below the fine filter plate (20), and the drain pipe (36) is connected to the hydroiodic acid distillation tower.

4. A purification device for HIx phase in a thermochemical sulfur-iodine cycle hydrogen production according to claim 1, characterized in that, the liquid inlet pipe (4) is vertically installed at the top of one side of the liquid inlet chamber (3), and the liquid inlet pipe (4) is connected to the heavy liquid phase outlet of the separation tower.

5. A purification device for HIx phase in a thermochemical sulfur-iodine cycle for hydrogen production according to claim 1, characterized in that, the driving water wheel (5) includes a wheel body (6), a wheel shaft (7), and a worm gear (11). The wheel body (6) is fixed on the wheel shaft (7), and the worm gear (11) is fixed on the wheel shaft (7); the part of the rotating shaft (13) exposed above the top of the filter chamber (1) is coaxially fixed with a worm (12), and the worm (12) meshes with the worm gear (11).

6. A HIx phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle according to claim 5, characterized in that, The axle (7) includes a first shaft (701) and a second shaft (702). The first shaft (701) is used to fix the wheel body (6), and the second shaft (702) is used to fix the worm wheel (11). A connecting seat (8) is fixed at the end of the first shaft (701). The inner cavity of the connecting seat (8) is a cylindrical cavity, and a closed ring (26) through which the second shaft (702) passes is fixedly installed at the cavity opening end. A frustum (22) is fixed at one end of the second shaft (702) located in the cylindrical cavity. One end of the frustum (22) is in pressing contact with the bottom of the cylindrical cavity through a disc spring (21), and a stud (23) is rotatably installed at the other end. The stud (23) is arranged parallel to the second shaft (702) and is in threaded cooperation with the closed ring (26).

7. A HIx phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle according to claim 6, characterized in that, A plurality of the studs (23) are provided and are annularly arrayed around the second shaft (702). A cylindrical gear (10) is fixed at the end of each stud (23), and the cylindrical gear (10) meshes with an internal gear ring (25) rotatably installed on the connecting seat (8).

8. A purification device for HIx phase in thermochemical sulfur-iodine cycle hydrogen production according to claim 7, characterized in that, An annular sleeve (9) is integrally connected to the outside of the internal gear ring (25). One end of the annular sleeve (9) is threadedly screwed onto the outer side wall of the connecting seat (8). In the inner wall of the annular sleeve (9), a resisting spring (24) is axially installed. One end of the resisting spring (24) exposed outside the inner wall of the annular sleeve (9) is in pressing contact with the end face of the closed ring (26).

9. A purification device for HIx phase in thermochemical sulfur-iodine cycle hydrogen production according to claim 1, characterized in that, The driving assembly includes a bent shaft (27) fixed at the top near the bottom of the material receiving groove (16). A connecting rod (28) is fixed in the radial direction of the bent shaft (27). The connecting rod (28) is fixed on the main shaft of a motor (29). The motor (29) is installed on the back of the filtering bin (1). The free end of the bent shaft (27) is slidably inserted into a concentrically arranged bent pipe (30). The bent pipe (30) is fixed in the filtering bin (1), and an arc spring (31) is installed in the bent pipe (30). The arc spring (31) is connected to the free end of the bent shaft (27) and together with the bent shaft (27) makes the material receiving groove (16) be located below the strip-shaped through hole (15) under normal conditions, and there is a gap between the material receiving groove (16) and the outer side surface of the conical filter cover (2). It further includes a first conductor (33), a second conductor (35), a return spring (34) and an insulating slider (32). The return spring (34) is sleeved outside the second conductor (35) without contact, and the free end of the return spring (34) is connected to the first conductor (33), so that in the normal state, the two conductors do not contact each other. One end of the first conductor (33) is integrally fixed with the insulating slider (32). The other end of the insulating slider (32) exposes the inner top surface of the filter chamber (1) in the normal state, and the exposed top surface of the insulating slider (32) has a convex arc surface (3201), so that during the period when the scraper (14) is in pressing contact with the arc surface (3201) and completely squeezes the insulating slider (32) into the inner top wall of the filter chamber (1), the first conductor (33) and the second conductor (35) always remain in contact with each other.

10. A HIx phase purification device for hydrogen production by the thermochemical sulfur-iodine cycle according to claim 9, characterized in that, The insulating slider (32) is a sector-shaped block structure, and the edge on the left side in the radial direction at the bottom end has a rounded corner to form the arc surface (3201), and the rest of the bottom end surface is a horizontal end surface (3202). When the top end of the scraper (14) slides in contact with the horizontal end surface (3202), the first conductor (33) and the second conductor (35) always remain in contact with each other.

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