VOC high-purity hydrogen generator

Abstract

The utility model relates to hydrogen production device technical field discloses a VOC high -purity hydrogen generator in order to solve the problem that the mixed gas after reaction is not easy to carry out multistage impurity removal treatment in prior art, makes hydrogen production purity general. The utility model discloses hydrogen production reactor, feed pipe, exhaust pipe, condenser, impurity removal subassembly, PSA device, deoxidizer, drying tower, hydrogen storage tank etc. utilize the physical, chemical action of impurity removal subassembly, and the hydrogen purity is improved to the mixed gas after reaction gradually removes impurity in stages, and the adsorption impurity removal effect under different pressure is realized by the double set cooperation of PSA device, and the fine pressure variation range, and the residual oxygen is removed by deoxidizer, and the double -tower structure of drying tower can be used synchronously or single -tower alternately, and the water vapor is removed and the energy consumption is reduced, and the maintenance is convenient, and the hydrogen purity in storage tank is further improved while guaranteeing the impurity removal purification efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production equipment technology, and in particular to a VOC high-purity hydrogen generator. Background Technology

[0002] A VOC high-purity hydrogen generator is a device that uses methanol cracking technology to convert methanol and water into hydrogen, and then purifies it through multiple stages to obtain ultra-high-purity hydrogen. It is suitable for applications with stringent requirements for hydrogen purity, such as laboratory analysis, fuel cells, and semiconductor manufacturing. It can also be used to recycle hydrogen from industrial waste gas.

[0003] Chinese Patent Publication No. CN214167356U discloses a methanol cracking hydrogen production device, including a hydrogen production reactor. The gas outlet of the hydrogen production reactor is connected to a condenser, the gas outlet of the condenser is connected to a decontamination box, and the gas outlet of the decontamination box is connected to a collection tank. The heat exchanger is located inside the cylinder, which can reduce heat loss. The hydrogen production reactor has a compact structure, which can reduce energy consumption. The equipment is small in size and occupies little space.

[0004] The aforementioned existing technical solution has the following shortcomings: In this device, methanol and demineralized water undergo a heating reaction inside the hydrogen production reactor under the action of a heat exchanger to generate a mixed gas, which is then purified by a purification box. On the one hand, because the methanol and demineralized water are not preheated before the reaction, the heating catalytic reaction efficiency in the hydrogen production reactor is generally low. On the other hand, because the purification box mainly contains sodium hydroxide solution, after the impurities are removed, the hydrogen gas often mixes with water vapor and some undissolved oxygen, resulting in generally low hydrogen purity. Therefore, there is room for improvement. Utility Model Content

[0005] The technical problem to be solved by this invention is that the existing technology does not easily perform multi-stage impurity removal treatment on the mixed gas after the reaction, resulting in the general purity of hydrogen produced. To address this, we propose a VOC high-purity hydrogen generator.

[0006] To achieve the above objectives, this application adopts the following technical solution: a VOC high-purity hydrogen generator, comprising a hydrogen production reactor, with a feed pipe and an exhaust pipe sequentially connected to one side of the hydrogen production reactor. One end of the exhaust pipe penetrates the interior of the feed pipe and is connected to a condenser. One end of the condenser is connected to a purification component, and one end of the purification component is connected to a hydrogen storage tank. The purification component includes a PSA device, one end of which is connected to a deoxygenation reactor. One end of the deoxygenation reactor is connected to a drying tower, and one end of the drying tower is connected to the inlet of the hydrogen storage tank. The hydrogen production reactor includes a reaction vessel, with a sealing cap at the top. A fixing frame is fixed between the sealing cap and the reaction vessel. A catalyst assembly is located at the top of the fixing frame, and the bottom end of the catalyst assembly penetrates the fixing frame. A hot oil spiral coil is installed inside the reaction vessel, with both ends of the hot oil spiral coil extending to the outside of the reaction vessel. The outlet of the feed pipe is located below the inlet of the exhaust pipe.

[0007] Preferably, the PSA device includes two sets of adsorption towers, which are filled with molecular sieves and activated carbon, and the operating pressure of the PSA device is 0.5-1.5 MPa.

[0008] Preferably, the deoxygenation reactor is filled with a palladium catalyst, and the reaction temperature of the deoxygenation reactor is 150-200℃.

[0009] Preferably, the drying tower adopts a double-tower structure, with a control valve installed between the two towers. Both towers are filled with condenser A molecular sieve, and a dew point meter is installed at the outlet of the drying tower.

[0010] Preferably, the sealing cover includes a sealing ring fixed to the top of the outside of the reaction vessel, a threaded cover is threaded on the top of the reaction vessel, the bottom end of the outer wall of the threaded cover abuts against the inner wall of the sealing ring, handles are fixed on both sides of the threaded cover, a fixing block is fixed to the top inside the threaded cover, and a pressure pad is fixed to the bottom end of the fixing block.

[0011] Preferably, the catalyst assembly includes a disc, with catalyst mesh tubes equidistantly passing through the interior of the disc. The bottom end of the catalyst mesh tube passes through a fixing frame, and a threaded cap is threaded onto the top end of the catalyst mesh tube. The top end of the threaded cap abuts against the bottom end of the pressure pad.

[0012] Preferably, a magnetic block is fixed to the outer edge of the bottom end of the disk, and an annular groove is provided on the outer edge of the fixing frame below the disk. An electromagnetic ring is provided inside the annular groove, and the bottom end of the magnetic block extends into the interior of the annular groove and is magnetically attracted and fixed to the surface of the electromagnetic ring.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] In this invention, through the function of the impurity removal component, impurities in the reaction mixture are removed step by step using physical and chemical methods, thereby further improving the purity of hydrogen production. The dual-unit operation of the PSA device allows for more precise control over the pressure variation range within the PSA device, enabling adsorption and impurity removal of the condensed mixture after the hydrogen production reactor reaction under different pressures, thus improving the impurity removal effect. In conjunction with the deoxygenation reactor, residual oxygen in the mixture is removed. The dual-tower structure of the drying tower removes residual water vapor in the reaction mixture, further improving the hydrogen purity in the hydrogen storage tank. Furthermore, depending on the required reaction gas volume, the dual towers can be used simultaneously or alternately with a single tower, reducing energy consumption and pressure while facilitating alternating maintenance and ensuring efficient impurity removal and purification. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the impurity removal component of this utility model;

[0018] Figure 3 This is a three-dimensional cross-sectional view of the reaction vessel of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the annular groove distribution of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the catalyst assembly of this utility model;

[0021] Figure 6 This is a three-dimensional structural diagram of the sealing cap of this utility model.

[0022] Legend: 1. Hydrogen production reactor; 11. Reaction vessel; 12. Sealing cap; 121. Threaded cover; 122. Handle; 123. Sealing ring; 13. Fixing frame; 14. Catalyst assembly; 141. Disc; 142. Catalyst mesh tube; 143. Threaded cap; 15. Hot oil spiral coil; 2. Feed pipe; 3. Exhaust pipe; 4. Condenser; 5. Impurity removal assembly; 51. PSA unit; 52. Deoxygenation reactor; 53. Drying tower; 6. Hydrogen storage tank; 7. Annular groove; 8. Magnetic block; 9. Fixing block; 10. Pressure pad. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] Reference Figure 1 , Figure 2 As shown, this utility model provides a technical solution: a VOC high-purity hydrogen generator, including a hydrogen production reactor 1. A feed pipe 2 and an exhaust pipe 3 are sequentially connected to one side of the hydrogen production reactor 1. One end of the exhaust pipe 3 penetrates the interior of the feed pipe 2 and is connected to a condenser 4. One end of the condenser 4 is connected to a purification component 5. One end of the purification component 5 is connected to a hydrogen storage tank 6. The purification component 5 includes a PSA device 51. One end of the PSA device 51 is connected to a deoxygenation reactor 52. One end of the deoxygenation reactor 52 is connected to a drying tower 5. 3. One end of the drying tower 53 is connected to the inlet end of the hydrogen storage tank 6. The hydrogen production reactor 1 includes a reaction tank 11. A sealing cover 12 is provided at the top of the reaction tank 11. A fixing frame 13 is fixed between the sealing cover 12 and the reaction tank 11. A catalyst assembly 14 is provided at the top of the fixing frame 13. The bottom end of the catalyst assembly 14 passes through the fixing frame 13. A hot oil spiral coil 15 is provided inside the reaction tank 11. Both ends of the hot oil spiral coil 15 extend to the outside of the reaction tank 11. The outlet of the feed pipe 2 is located below the inlet of the exhaust pipe 3.

[0025] The PSA device 51 is used to remove impurities such as CO and CH4 from the mixed gas after the reaction by pressure swing adsorption. The deoxygenation reactor 52 is used to react the residual oxygen and hydrogen in the mixed gas after the reaction to produce water, thereby further improving the purity of hydrogen. Then, the drying tower 53 is used to remove water vapor from the mixed gas, ensuring the final purity of hydrogen produced by the hydrogen production reactor 1.

[0026] Reference Figure 2 As shown, in this embodiment, the PSA device 51 includes two sets of adsorption towers, which are filled with molecular sieves and activated carbon. The operating pressure of the PSA device 51 is 0.5-1.5 MPa.

[0027] By using two sets of adsorption towers in combination, the pressure change cycle in each set of adsorption towers can be refined and cyclically processed, thereby improving the removal efficiency of impurities in the mixed gas.

[0028] The deoxygenation reactor 52 is filled with a palladium catalyst, and the reaction temperature of the deoxygenation reactor 52 is 150-200℃.

[0029] The drying tower 53 has a double tower structure with a control valve between the two towers. Both towers of the drying tower 53 are filled with condenser 4A molecular sieves, and a dew point meter is installed at the outlet of the drying tower 53.

[0030] A dew point meter is used to determine the water vapor usage of the desiccant inside the two towers of drying tower 53, so that the desiccant can be replaced in a timely manner. The dual-tower structure is used to switch the operating mode, and the continuous hydrogen production process is achieved by using a one-maintenance-one-operation mode. At the same time, the dual towers or single towers can be rotated according to the gas volume to ensure purification efficiency.

[0031] Reference Figures 3-6 As shown, in this embodiment: the sealing cover 12 includes a sealing ring 123 fixed to the top of the outside of the reaction vessel 11. The top of the reaction vessel 11 is threaded with a threaded cover 121. The bottom of the outer wall of the threaded cover 121 abuts against the inner wall of the sealing ring 123. Handles 122 are fixed on both sides of the threaded cover 121. A fixing block 9 is fixed to the top of the inside of the threaded cover 121. A pressure pad 10 is fixed to the bottom of the fixing block 9.

[0032] The use of threaded connections ensures airtightness while improving ease of assembly and disassembly.

[0033] The catalyst assembly 14 includes a disc 141, through which catalyst mesh tubes 142 are equidistantly inserted. The bottom end of the catalyst mesh tubes 142 passes through a fixing frame 13, and the top end of the catalyst mesh tubes 142 is threaded with a threaded cap 143. The top end of the threaded cap 143 abuts against the bottom end of the pressure pad 10.

[0034] A magnetic block 8 is fixed to the outer edge of the bottom end of the disc 141. An annular groove 7 is provided on the outer edge of the fixing frame 13 below the disc 141. An electromagnetic ring is provided inside the annular groove 7. The bottom end of the magnetic block 8 extends into the annular groove 7 and is magnetically attracted and fixed to the surface of the electromagnetic ring.

[0035] The electromagnetic ring is energized to generate magnetism, thereby improving the connection stability between the disc 141 and the fixing frame 13. At the same time, in conjunction with the fixing block 9, the installation reliability of the catalyst network tube 142 is further improved.

[0036] Working principle: During use, methanol and demineralized water are poured into the reaction tank 11 through the feed pipe 2. Hot oil is exchanged inside the reaction tank 11 using the hot oil spiral coil 15, causing the methanol and demineralized water to crack together with the catalyst in the catalyst assembly 14 at high temperature to generate a mixed gas mainly composed of hydrogen. The mixed gas is discharged into the condenser 4 through the exhaust pipe 3 for cooling. The exhaust pipe 3 passes through the inside of the feed pipe 2, thus utilizing the residual heat of the mixed gas to treat the methanol and demineralized water before the reaction. After cooling, the mixed gas in the condenser 4 enters the PSA unit 51. The circulating pressure change of the PSA unit 51 causes the impurities in the mixed gas to have different adsorption properties for the adsorbent, thereby removing the impurities and obtaining relatively pure hydrogen. Then, it passes through the deoxygenation reactor 52 for deoxygenation treatment to remove unreacted oxygen. Then, it passes through the drying tower 53 to remove water vapor, obtaining high-purity hydrogen, which is then stored and used in the hydrogen storage tank 6.

[0037] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A VOC high purity hydrogen gas generator, characterized by, The application discloses a hydrogen production device, which comprises a hydrogen production reactor, a feed pipe and an exhaust pipe which are sequentially communicated with one side of the hydrogen production reactor, one end of the exhaust pipe penetrates the inside of the feed pipe and is communicated with a condenser, one end of the condenser is communicated with a impurity removal assembly, one end of the impurity removal assembly is communicated with a hydrogen storage tank, the impurity removal assembly comprises a PSA device, one end of the PSA device is communicated with a deoxidation reactor, one end of the deoxidation reactor is communicated with a drying tower, one end of the drying tower is communicated with the gas inlet end of the hydrogen storage tank, the hydrogen production reactor comprises a reaction tank, a sealing cover is arranged at the top end of the reaction tank, a fixing frame is fixed between the sealing cover and the reaction tank, a catalyst assembly is arranged at the top end of the fixing frame, the bottom end of the catalyst assembly penetrates the fixing frame, a hot oil spiral coil is arranged in the inside of the reaction tank, and both ends of the hot oil spiral coil extend to the outside of the reaction tank; the outlet of the feed pipe is located below the inlet of the exhaust pipe.

2. The VOC high purity hydrogen gas generator of claim 1, wherein: The PSA device comprises two groups of adsorption towers which are filled with molecular sieve and activated carbon, and the working pressure of the PSA device is 0.5-1.5 MPa.

3. The VOC high purity hydrogen gas generator of claim 2, wherein: The deoxidation reactor is filled with palladium catalyst, and the reaction temperature of the deoxidation reactor is 150-200 DEG C.

4. The VOC high purity hydrogen gas generator of claim 3, wherein: The inside of the drying tower adopts a double-tower structure, a control valve is arranged between the double towers, the double towers of the drying tower are both filled with condenser A molecular sieve, and a dew point instrument is arranged at the gas outlet of the drying tower.

5. The VOC high purity hydrogen gas generator of claim 1, wherein: The sealing cover comprises a sealing ring which is fixed at the top end of the outside of the reaction tank, a threaded cover is threadedly sleeved at the top end of the reaction tank, the bottom end of the outer wall of the threaded cover abuts against the inner wall of the sealing ring, handles are fixed at the two sides of the threaded cover, a fixing block is fixed at the top end in the inside of the threaded cover, and a pressure pad is fixed at the bottom end of the fixing block.

6. The VOC high purity hydrogen gas generator of claim 5, wherein: The catalyst assembly comprises a disc, catalyst mesh pipes are equidistantly arranged in the inside of the disc, the bottom end of the catalyst mesh pipe penetrates the fixing frame, a threaded cover is threadedly sleeved at the top end of the catalyst mesh pipe, and the top end of the threaded cover abuts against the bottom end of the pressure pad.

7. The VOC high purity hydrogen gas generator of claim 6, wherein: The bottom end of the disc is fixed with a magnetic block, an annular groove is formed in the outer edge of the fixing frame below the disc, an electromagnetic ring is arranged in the inside of the annular groove, and the bottom end of the magnetic block extends to the inside of the annular groove and is fixedly connected with the surface of the electromagnetic ring.

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