Method and system for producing hydrogen by melting and gasifying organic waste using redox method

Abstract

The present invention provides a method and system for producing hydrogen by melting and gasifying organic waste using a redox method. The system includes a low-temperature pyrolysis furnace for generating a carbon redox catalyst and a first gaseous gas; a melting gasification furnace for melting the carbon redox catalyst, quicklime, and a second organic solid waste to generate a second gaseous gas; a purification device for obtaining and purifying the gaseous gas to obtain hydrogen; a secondary pressure swing adsorption device for connecting to the purification device to purify the hydrogen; and a control unit for connecting to the low-temperature pyrolysis furnace, the melting gasification furnace, the purification device, and the secondary pressure swing adsorption device. The system provided by the present application adopts a controller unit for coordinated control, uses a low-temperature pyrolysis furnace to pyrolyze the first organic solid waste to generate a carbon redox catalyst, uses a melting gasification furnace to perform a redox reaction, and the gaseous gas generated by the reaction is purified and subjected to secondary pressure swing adsorption to obtain purified hydrogen. The coordinated operation of the equipment is achieved during the treatment process to generate pure hydrogen, thereby reducing the emission of toxic and harmful gases.

Description

Technical Field

[0001] The invention relates to the technical field of organic waste treatment, and in particular to a method and system for producing hydrogen by melting and gasifying organic waste using an oxidation-reduction method. Background Art

[0002] Organic waste (mainly organic solid waste) refers to household waste, market waste, scattered waste, hospital waste, construction waste and street sweeps generated by residents in their daily lives. The existing solutions mainly include incineration, sanitary landfill and composting. As the urban population continues to grow, the amount of urban waste is also increasing, resulting in an increase in the transportation cost of organic solid waste and a continuous reduction in the land available for sanitary landfill, making the operability of solutions such as sanitary landfill and composting increasingly low.

[0003] The existing waste incineration technology is mainly a process of rapidly oxidizing organic solid waste, and in the process it produces a large amount of light and heat as well as a variety of toxic and harmful gases, which further causes the deterioration of the ecological environment. Summary of the invention

[0004] In order to solve the technical problems mentioned in the above background technology or at least partially solve the above technical problems, the present application provides a method and system for producing hydrogen by melting and gasifying organic waste using a redox method, which can effectively treat solid waste while reducing toxic and harmful gas emissions and generating hydrogen, thereby avoiding damage to the environment.

[0005] In a first aspect, the present application provides a system for producing hydrogen by melting and gasifying organic waste using a redox method, comprising:

[0006] a low temperature pyrolysis furnace for processing the first organic solid waste to generate a carbon redox catalyst and a first methane gas;

[0007] A conveying device, connected to a material output end of the low-temperature pyrolysis furnace, to obtain a carbon redox catalyst;

[0008] The melter-gasifier has a material input end disposed at the top of the melter-gasifier, and is connected to a material output end of a conveying device to obtain and melt a carbon redox catalyst, quicklime, and a second organic solid waste to generate a second gaseous gas; a spiral fan and a steam input end are fixed to the side wall of the melter-gasifier, and an output end of the spiral fan extends obliquely to the inner side of the side wall of the melter-gasifier to form a spiral ascending airflow;

[0009] The purification device is connected to the gas output end of the melter-gasifier and the gas output end of the low-temperature pyrolysis furnace to obtain and purify the second gas and the first gas to obtain hydrogen;

[0010] A secondary pressure swing adsorption device is connected to the output end of the purification device to purify the hydrogen;

[0011] The control unit is electrically connected to the low-temperature pyrolysis furnace, the conveying device, the melting gasification furnace, the purification device and the secondary pressure swing adsorption device respectively.

[0012] Furthermore, it also includes an air separator, wherein a first output end of the air separator is connected to an input end of the low-temperature pyrolysis furnace, and a second output end of the air separator is connected to a gate valve unit belonging to the melter-gasifier, so as to inject nitrogen into the low-temperature pyrolysis furnace and the gate valve unit respectively;

[0013] The third output end of the air separator is connected to the second input end of the melter-gasifier for injecting oxygen.

[0014] Further, the conveying device includes a conveyor belt and an elevator;

[0015] The conveyor belt is connected to the material output end of the low-temperature pyrolysis furnace, the end of the conveyor belt is connected to the input end of the elevator, and the output end of the elevator is connected to the material input end of the melting gasification furnace.

[0016] Furthermore, a water quenching unit is provided on the inner side of the bottom of the melter-gasifier;

[0017] At least two spiral fans for forming a spiral ascending airflow are arranged at equal intervals on the side wall of the melter-gasifier.

[0018] Furthermore, the secondary pressure swing adsorption device comprises:

[0019] A primary pressure swing adsorption unit, wherein the input end of the primary pressure swing adsorption unit is connected to the output end of the purification device through a first separator;

[0020] The input of the secondary pressure swing adsorption unit is connected to the first output end of the primary pressure swing adsorption unit through the oil removal tower and the first heater in sequence; the first output end of the secondary pressure swing adsorption unit is connected to the gas buffer tank through the vacuum analysis unit.

[0021] Furthermore, the secondary pressure swing adsorption device further comprises a three-stage pressure swing adsorption unit, the input end of the three-stage pressure swing adsorption unit is connected to the second output end of the secondary pressure swing adsorption unit through a cooler; the output end of the three-stage pressure swing adsorption unit is connected in sequence through a second heater, a dryer and a second separator;

[0022] The secondary pressure swing adsorption device also includes a downstream gas buffer tank, a desorption gas buffer tank and a steam unit;

[0023] The second output end of the first-stage pressure swing adsorption unit, the second output end of the second-stage pressure swing adsorption unit, and the second output end of the third-stage pressure swing adsorption unit are respectively connected to the input end of the downstream gas buffer tank;

[0024] The third output end of the first-stage pressure swing adsorption unit, the third output end of the second-stage pressure swing adsorption unit, and the third output end of the third-stage pressure swing adsorption unit are respectively connected to the input end of the desorption gas buffer tank, and the output end of the desorption gas buffer tank is connected to the second heater;

[0025] The steam units are connected to the first heater and the second heater respectively.

[0026] In a second aspect, the present application further provides a method for producing hydrogen by melting and gasifying organic waste using a redox method, which is applied to the system of the first aspect, comprising:

[0027] The low-temperature pyrolysis furnace pyrolyzes the first organic solid waste to generate a carbon redox catalyst and a first gas;

[0028] The melter-gasifier melts the carbon redox catalyst, quicklime and the second organic solid waste to generate a second gas;

[0029] The purification device purifies the first gas and the second gas to obtain hydrogen;

[0030] The secondary pressure swing adsorption device performs secondary pressure swing adsorption of hydrogen to generate purified hydrogen.

[0031] Furthermore, before the low-temperature pyrolysis of the first organic solid waste, the method further comprises:

[0032] Air separators separate nitrogen and oxygen from the air;

[0033] Inject nitrogen into the multi-stage gate valves of the low-temperature pyrolysis furnace and the melt gasification furnace;

[0034] Inject oxygen into the air mixing port of the melt-gasification furnace.

[0035] Furthermore, the melter-gasifier melts the carbon redox catalyst, quicklime and the second organic solid waste to generate the second gas, which specifically includes:

[0036] Drying and oxidizing and reducing the carbon redox catalyst, quicklime and the second organic solid waste to generate a second gas and liquid slag;

[0037] The liquid slag is quenched in water to form a glass-ceramic body.

[0038] Further, the secondary pressure swing adsorption device performs secondary pressure swing adsorption of hydrogen to generate purified hydrogen, specifically comprising:

[0039] Desulfurizing and purifying hydrogen to obtain desulfurized hydrogen;

[0040] After primary pressure swing adsorption and secondary purification of desulfurized hydrogen, primary pressure swing hydrogen is obtained;

[0041] Secondary pressure swing adsorption and pressure swing hydrogen are used to obtain purified hydrogen.

[0042] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: the method and system for producing hydrogen by melting and gasifying organic waste using the redox method provided by the present application, the system uses a controller unit to first pyrolyze the first organic solid waste in a low-temperature pyrolysis furnace to generate a carbon redox catalyst, and then uses a conveying device to transport the carbon redox catalyst, quicklime, and the second organic solid waste to the melting gasification furnace for redox reaction, and purifies and secondary pressure swing adsorption the gas generated by the pyrolysis process and the redox process to obtain pure hydrogen, so that in the process of thermal decomposition treatment of organic solid waste, the control unit is used to realize the coordinated operation between the equipment, and the generation of pure hydrogen effectively reduces the emission of toxic and harmful gases, thereby avoiding damage to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] Figure 1 It is a structural principle diagram of a system for producing hydrogen by melting and gasifying organic waste using a redox method provided in an embodiment of the present invention.

[0045] Figure 2 It is a structural principle diagram of a secondary pressure swing adsorption device in a system for producing hydrogen by melting and gasifying organic waste using a redox method provided in an embodiment of the present invention.

[0046] Figure 3 It is a schematic diagram of the connection between a melt gasification furnace and a purification device in a system for producing hydrogen by melt gasification of organic waste using a redox method provided in an embodiment of the present invention.

[0047] Figure 4 It is a schematic flow chart of a method for producing hydrogen by melting and gasifying organic waste using a redox method provided in an embodiment of the invention.

[0048] Figure 5 It is another flow chart of the method for producing hydrogen by melting and gasifying organic waste using the redox method provided in the embodiment of the invention.

[0049] Figure 6 It is a schematic flow chart of the melting process in the method for producing hydrogen by melting and gasifying organic waste using a redox method provided in an embodiment of the invention.

[0050] Figure 7 It is a schematic flow diagram of secondary pressure swing adsorption in a method for producing hydrogen by melting and gasifying organic waste using a redox method provided in an embodiment of the invention.

[0051] In the figure: 1. low temperature pyrolysis furnace; 2. conveying device; 3. melting gasification furnace; 4. spiral fan; 5. steam input end; 6. purification device; 7. secondary pressure swing adsorption device; 8. control unit; 9. air separation unit; 10. gate valve unit; 11. water quenching unit; 12. primary pressure swing adsorption unit; 13. first separator; 14. secondary pressure swing adsorption unit; 15. oil removal tower; 16. first heater; 17. vacuum analysis unit; 18. tertiary pressure swing adsorption unit; 19. second heater; 20. dryer; 21. second separator; 22. downstream gas buffer tank; 23. desorption gas buffer tank; 24. steam unit; 25. gas buffer tank; 26. coal gas purification unit; 27. CO conversion unit; 28. acid gas removal unit.

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] At present, the main methods for organic solid waste and other garbage are incineration, sanitary landfill and composting. However, with the increase in transportation costs of organic solid waste, composting time and machinery costs, and the reduction in land available for landfill, the feasibility of sanitary landfill and composting has become increasingly smaller.

[0055] The incineration process of organic solid waste is essentially a redox reaction, which produces a large amount of light and heat and is accompanied by the generation of multiple toxic and harmful gases, which in turn aggravates ecological environmental pollution and loses a large amount of renewable resources, which is not conducive to the sustainable development of the environment and the economy.

[0056] In order to reduce the pollution caused by incineration of organic solid waste to the environment and ensure the sustainable development of the environment, the present application provides a method and system for producing hydrogen by melting and gasifying organic solid waste using a redox method. In order to facilitate the understanding of the embodiments of the present invention, a system for producing hydrogen by melting and gasifying organic solid waste using a redox method is first introduced in detail.

[0057] Embodiment 1

[0058] like Figure 1 , Figure 2 and Figure 3 As shown, the system for producing hydrogen by melting and gasifying organic solid waste using a redox method comprises:

[0059] The low-temperature pyrolysis furnace 1 is used to process the first organic solid waste to generate a carbon redox catalyst and a first gas; the first organic solid waste includes old tires, dried organic sludge, etc., which are subjected to low-temperature anaerobic pyrolysis in the low-temperature pyrolysis furnace 1. The temperature required for pyrolysis is about 500°C to 700°C, and the first organic solid waste is carbonized to generate a carbon redox catalyst.

[0060] The conveying device 2 is connected to the material output end of the low-temperature pyrolysis furnace 1 to obtain the carbon redox catalyst; specifically, the conveying device 2 includes but is not limited to a conveyor belt and an elevator.

[0061] The melting gasifier 3, the material input end of the melting gasifier 3 is arranged at the top of the melting gasifier 3, and is connected to the material output end of the conveying device 2 to obtain and melt the carbon redox catalyst, quicklime, and the second organic solid waste to generate the second gas; in a preferred embodiment, the melting gasifier 3 adopts a fixed bed vertical reactor. The carbon redox catalyst, quicklime, and the second organic solid waste are poured into the melting gasifier 3 in a mixed state, and are dried, oxidized and decomposed, and reduced and melted in turn. It should be added here that the above-mentioned carbon redox catalyst and the second organic solid waste are mixed in a mass ratio of 1:5, accompanied by limestone as a solvent.

[0062] A spiral fan 4 and a steam input end 5 are fixed to the side wall of the melter-gasifier 3, and the output end of the spiral fan 4 extends obliquely to the inner side of the side wall of the melter-gasifier 3 to form a spiral rising airflow; specifically, the spiral fan 4 is arranged at the bottom of the melter-gasifier 3 to inject air obliquely, and a spiral wind in a tornado state (pressure greater than 10Mpa) is formed under the action of the furnace top expansion body, which drives the steam input from the steam input end 5 to form a hot airflow to react with the above mixture.

[0063] It should be added here that the above oxidation reaction includes the following stages depending on the reaction temperature:

[0064] 100℃~200℃: Drying; removing physical water.

[0065] 250℃: Deoxidation; elimination of water components; beginning of H2S gasification phase (oxidation reaction):

[0066] 340℃: CH4 and aliphatic compounds begin to fission 380℃, organic matter carbonizes.

[0067] 400℃~600℃: CO and CN compounds fission; asphaltene conversion to tar.

[0068] >600℃: Asphaltene cracks into thermally stable chain gaseous hydrocarbons; aromatics are synthesized.

[0069] 800℃~1300℃: Gasification; the halogen is completely in a vapor state (such as alkali metal chloride or HCl).

[0070] The reduction melting stage includes:

[0071] 1400~2000℃: Aromatic hydrocarbons and organic compounds begin to completely decompose, minerals melt, and finally generate secondary gas and liquid slag.

[0072] The purification device 6 is connected to the gas output end of the melter-gasifier 3 and the gas output end of the low-temperature pyrolysis furnace 1 to obtain and purify the second gas and the first gas to obtain hydrogen;

[0073] Specifically, the purification device 6 includes a gas purification unit 26, a CO conversion unit 27 and an acid gas removal unit 28 connected in sequence. The first gas and the second gas contain hydrogen, other gases and impurities. The gas purification unit 26 is mainly used to preliminarily purify the impurities in the first gas and the second gas. The impurities will be discharged through the bottom of the purification device 6 and returned to the furnace.

[0074] The CO conversion unit is used to burn the CO mixed in the gas to generate CO2, and then the gas and CO2 are initially desulfurized and CO2 is removed through the acid gas removal unit 28.

[0075] The secondary pressure swing adsorption device 7 is connected to the output end of the purification device 6 to purify the hydrogen. The function of the pressure swing adsorption is to utilize the different adsorption capacities of the adsorbent in the adsorption device for various components in the impure hydrogen, thereby achieving the purification of the hydrogen.

[0076] The control unit 8 is electrically connected to the low-temperature pyrolysis furnace 1 , the conveying device 2 , the melter-gasifier 3 , the purification device 6 and the secondary pressure swing adsorption device 7 , respectively.

[0077] Specifically, the control unit 8 includes but is not limited to a single chip microcomputer, which is electrically connected to the low-temperature pyrolysis furnace 1 to control the temperature, time and atmosphere of the carbonization of the first organic solid waste.

[0078] The control unit 8 is electrically connected to the melter-gasifier 3, and sets different ratio moduli according to the components of the second organic solid waste sample to control the entry speed of the carbon redox catalyst. At the same time, under ideal conditions, the wind pressure generated by the spiral fan 4 inside the melter-gasifier 3 is ≥10Mpa, and the wind volume is ≥415m 3 The control unit 8 and the pressure sensor on the top of the melter-gasifier 3 obtain the above wind pressure and wind volume, and control the speed of the spiral fan 4 to maintain the stability of the wind pressure and wind volume.

[0079] The present application provides a method and system for producing hydrogen by melting and gasifying organic waste using a redox method. The system uses a controller unit to first pyrolyze a first organic solid waste in a low-temperature pyrolysis furnace to generate a carbon redox catalyst, and then uses a conveying device to transport the carbon redox catalyst, quicklime, and a second organic solid waste to the melting gasification furnace for a redox reaction. The gas generated by the pyrolysis process and the redox process is purified and subjected to secondary pressure swing adsorption to obtain pure hydrogen. In the process of thermal decomposition of the organic solid waste, the control unit is used to achieve coordinated operation between the equipment, and while generating pure hydrogen, the emission of toxic and harmful gases is effectively reduced, thereby avoiding damage to the environment.

[0080] Embodiment 2

[0081] On the basis of the first embodiment, the system for producing hydrogen by melting and gasifying organic waste using the redox method provided by the present application further includes an air separator 9, the first output end of the air separator 9 is connected to the input end of the low-temperature pyrolysis furnace 1, so as to prevent gas leakage in the low-temperature pyrolysis furnace 1. The second output end of the air separator 9 is connected to the gate valve unit 10 belonging to the melting and gasification furnace 3, so as to inject nitrogen into the low-temperature pyrolysis furnace 1 and the gate valve unit 10 respectively;

[0082] In a preferred embodiment, the gate valve unit 10 adopts a charging throttle valve, which internally includes at least two-stage gate valve structures, a material support structure, and a fire prevention and sealing mechanism; nitrogen is filled into the multi-stage gate valve system to ensure that the gas in the furnace will not leak out, thereby ensuring that the carbon redox catalyst, quicklime, and the second organic solid waste fall from top to bottom.

[0083] The third output end of the air separator 9 is connected to the second input end of the melter-gasifier 3 for injecting oxygen. Specifically, a mixing port is provided at the bottom of the melter-gasifier 3, and the oxygen separated by the air separator 9 is injected into the melter-gasifier 3 through the mixing port, and forms a tornado state under the action of the spiral fan 4 to meet the oxygen content required for the oxidation reaction in the melter-gasifier 3.

[0084] Furthermore, the conveying device 2 includes a conveyor belt and an elevator;

[0085] The conveyor belt is connected to the material output end of the low-temperature pyrolysis furnace 1 , the end of the conveyor belt is connected to the input end of the elevator, and the output end of the elevator is connected to the material input end of the melter-gasifier 3 .

[0086] Furthermore, a water quenching unit 11 is provided at the inner side of the bottom of the melt-gasification furnace 3 ; the function of the water quenching unit 11 is to process the liquid slag produced in the reduction melting stage into a glass ceramic body through a water quenching process.

[0087] In a preferred embodiment, the control unit 8 is electrically connected to the air separator 9, the charging damper, and the lifting machine to control the working states of each of them. Specifically, the control unit 8 controls the air separator 9 to adjust the rate of separation and delivery of nitrogen and oxygen; the control unit 8 controls the charging damper to adjust the descending rate of the carbon redox catalyst, quicklime, and the second organic solid waste; the control unit 8 controls the lifting motor to adjust the transmission rate of the lifting motor to the carbon redox catalyst, quicklime, and the second organic solid waste.

[0088] At least two spiral fans 4 for forming a spiral upward airflow are arranged at equal intervals on the side wall of the melter-gasifier 3. The tornado effect is enhanced by arranging at least two spiral fans 4.

[0089] Furthermore, the control unit 8 realizes the coordinated work among the different devices by decentralized control of the low-temperature pyrolysis furnace 1, the conveying device 2, the melter-gasifier 3, the purification device 6, the secondary pressure swing adsorption device 7, the air separator 9, the charging damper and the elevator.

[0090] Embodiment 3

[0091] On the basis of Example 1, in the system for producing hydrogen by melting and gasifying organic waste using a redox method provided by the present application, the secondary pressure swing adsorption device 7 comprises:

[0092] The first-stage pressure swing adsorption unit 12, the input end of the first-stage pressure swing adsorption unit 12 is connected to the output end of the purification device 6 through the first separator 13; the function of the first separator 13 is to desulfurize and purify and filter the moisture in the impure hydrogen, and then the mixed gas is purified by the first-stage pressure swing adsorption unit 12. It should be noted here that the hydrogen after the first-stage pressure swing adsorption needs to be measured for gas composition to identify the purification effect.

[0093] The input of the secondary pressure swing adsorption unit 14 is connected to the first output end of the primary pressure swing adsorption unit 12 through the oil removal tower 15 and the first heater 16 in sequence; the first output end of the secondary pressure swing adsorption unit 14 is connected to the gas buffer tank 25 through the vacuum analysis unit 17. The oil removal tower 15 is used to remove the impurities remaining in the primary pressure swing adsorption hydrogen by the solvent. The first heater 16 is used to heat the hydrogen after the primary pressure swing adsorption to improve the removal effect of the solvent on impurities.

[0094] The secondary pressure swing adsorption unit 14 performs secondary purification on the primary desulfurized hydrogen, and then the vacuum analysis unit 17 performs hydrogen composition measurement again, and the purified hydrogen is injected into the gas buffer tank 25 .

[0095] In a preferred embodiment, the secondary pressure swing adsorption device 7 further includes a three-stage pressure swing adsorption unit 18, the input end of the three-stage pressure swing adsorption unit 18 is connected to the second output end of the secondary pressure swing adsorption unit 14 through a cooler; the output end of the three-stage pressure swing adsorption unit 18 is connected in sequence through a dryer 20 and a second separator 21;

[0096] The hydrogen after the secondary pressure swing adsorption is cooled by a cooler and then passes through a tertiary pressure swing adsorption unit 18 for tertiary pressure swing adsorption.

[0097] The secondary pressure swing adsorption device 7 further includes a discharge gas buffer tank 22, a desorption gas buffer tank 23 and a steam unit 24;

[0098] The second output end of the first-stage pressure swing adsorption unit 12, the second output end of the second-stage pressure swing adsorption unit 14, and the second output end of the third-stage pressure swing adsorption unit 18 are respectively connected to the input end of the downstream gas buffer tank 22; the function of the upstream gas buffer tank 22 is to prevent the first-stage pressure swing adsorption unit 12, the second-stage pressure swing adsorption unit 14 and the third-stage pressure swing adsorption unit 18 from reacting too quickly.

[0099] The third output end of the first-stage pressure swing adsorption unit 12, the third output end of the second-stage pressure swing adsorption unit 14, and the third output end of the third-stage pressure swing adsorption unit 18 are respectively connected to the input end of the desorption gas buffer tank 23, and the output end of the desorption gas buffer tank 23 is connected to the second heater 19;

[0100] The steam unit 24 is connected to the first heater 16 and the second heater 19 respectively. It should be added here that the desorption gas buffer tank 23 is connected to the first pressure swing adsorption unit 12, the second pressure swing adsorption unit 14 and the third pressure swing adsorption unit 18 to receive the gas generated by them and prepare the catalyst required for purifying hydrogen after using the second heater 19. The hydrogen after the third pressure swing adsorption is mixed with the catalyst, and after dehydrogenation and drying, the waste water is separated by the second separator 21 to obtain dry pure hydrogen.

[0101] Embodiment 4

[0102] A method for producing hydrogen by melting and gasifying organic waste using a redox method, such as Figure 4 As shown, including:

[0103] S01: A low-temperature pyrolysis furnace pyrolyzes the first organic solid waste to generate a carbon redox catalyst and a first gas. The low-temperature pyrolysis furnace carbonizes the first organic solid waste to generate a carbon redox catalyst by low-temperature oxygen-free pyrolysis at a temperature of 500° C. to 700° C.

[0104] S02: The melter-gasifier melts the carbon redox catalyst, quicklime and the second organic solid waste to generate a second gas. The redox reaction in the melter-gasifier has been described in the first embodiment and will not be described again here.

[0105] It should be added that the carbon redox catalyst is transported from the low-temperature pyrolysis furnace to the top of the melter-gasifier through a conveyor, and the conveyor adds limestone and the second organic solid waste during the conveying process.

[0106] S03: The purification device purifies the first gas and the second gas to obtain hydrogen; the first gas and the second gas contain hydrogen, acid gas and impurities. The purification process mainly includes steps such as coal gas purification, CO conversion and high-pressure acid gas removal. Among them, the impurities are absorbed by returning the slag to the furnace. The acid gas is recovered to the sludge through high-pressure acid gas removal.

[0107] S04: Secondary pressure swing adsorption device performs secondary pressure swing adsorption of hydrogen to generate purified hydrogen. The specific purification process has been described in Example 3 and will not be repeated here.

[0108] The method for producing hydrogen by melting and gasifying organic waste using a redox method provided by the present invention is applied to the aforementioned system and uses the same technical means and achieves the same technical effects, which will not be described in detail here.

[0109] Embodiment 5

[0110] On the basis of Example 5, further Figure 5 and Figure 6 As shown, before the low-temperature pyrolysis of the first organic solid waste, it also includes:

[0111] S05: Air separator separates nitrogen and oxygen from the air;

[0112] S06: Inject nitrogen into the multi-stage gate valves of the low-temperature pyrolysis furnace and the melt gasification furnace;

[0113] S07: injecting oxygen into the air mixing port of the melt-gasification furnace.

[0114] It should be added here that step S02 specifically includes:

[0115] S021: drying and oxidizing and reducing the carbon redox catalyst, quicklime and the second organic solid waste to generate a second gas and liquid slag;

[0116] S022: Water quenching liquid slag to form a glass-ceramic body.

[0117] Embodiment 6

[0118] On the basis of Example 4, further Figure 7 As shown, step S04 specifically includes:

[0119] S041: Desulfurizing and purifying hydrogen to obtain desulfurized hydrogen; the primary pressure swing adsorption unit separates waste water from impure hydrogen through the first separator during the desulfurization of impure hydrogen.

[0120] S042: After the primary pressure swing adsorption and secondary purification of desulfurized hydrogen, the primary pressure swing adsorption hydrogen is obtained; it should be added here that after the primary pressure swing adsorption hydrogen is obtained, the composition of the hydrogen needs to be measured to determine the purity after purification.

[0121] S043: Secondary pressure swing adsorption The primary pressure swing adsorption hydrogen is purified. The hydrogen composition is measured again using the vacuum analysis unit, and the purified hydrogen is injected into the gas buffer tank. It should be added here that before the secondary pressure swing adsorption is performed, and after the pressure swing adsorption hydrogen is heated by the first heater connected to the steam unit, the removal effect of the solvent in the deoiling tower on the impurities in the primary pressure swing adsorption hydrogen is improved.

[0122] In a selected implementation manner, after step S043, the method further includes:

[0123] S044: Three-stage pressure swing adsorption is used to purify hydrogen to obtain pure hydrogen. The purified hydrogen needs to be cooled by a cooler.

[0124] S045: receiving the catalyst generated in the desorption gas buffer tank, dehydrogenating and drying it, and performing secondary separation.

[0125] It should be added that the desorption gas buffer tank is connected to the first pressure swing adsorption unit, the second pressure swing adsorption unit and the third pressure swing adsorption unit to receive the water-containing hydrogen produced by them and heat them with the second heater to prepare the raw gas required for purifying hydrogen. The dehydrogenated and dried hydrogen is separated from the waste water by the second separator to obtain dry pure hydrogen.

[0126] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0127] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A system for producing hydrogen by melting and gasifying organic waste using a redox method, characterized in that: include: a low temperature pyrolysis furnace for processing the first organic solid waste to generate a carbon redox catalyst and a first methane gas; A conveying device, connected to a material output end of the low-temperature pyrolysis furnace to obtain the carbon redox catalyst; A melter-gasifier, wherein the material input end of the melter-gasifier is arranged at the top of the melter-gasifier, and is connected to the material output end of the conveyor device to obtain and melt the carbon redox catalyst, quicklime, and the second organic solid waste to generate a second gas; a spiral fan and a steam input end are fixed to the side wall of the melter-gasifier, and the output end of the spiral fan extends obliquely to the inner side of the side wall of the melter-gasifier to form a spiral rising airflow; A purification device, connected to the gas output end of the melter-gasifier and the gas output end of the low-temperature pyrolysis furnace, respectively, to obtain and purify the second gaseous gas and the first gaseous gas to obtain hydrogen; A secondary pressure swing adsorption device, connected to the output end of the purification device, to purify the hydrogen; a control unit, electrically connected to the low-temperature pyrolysis furnace, the conveying device, the melt-gasification furnace, the purification device, and the secondary pressure swing adsorption device, respectively; It also includes an air separator, wherein a first output end of the air separator is connected to an input end of the low-temperature pyrolysis furnace, and a second output end of the air separator is connected to a gate valve unit of the melter-gasifier, so as to inject nitrogen into the low-temperature pyrolysis furnace and the gate valve unit respectively; The third output end of the air separator is connected to the second input end of the melter-gasifier for injecting oxygen; A water quenching unit is provided on the inner side of the bottom of the melter-gasifier; At least two spiral fans for forming a spiral ascending airflow are arranged at equal intervals on the side wall of the melter-gasifier; The secondary pressure swing adsorption device comprises: A primary pressure swing adsorption unit, wherein the input end of the primary pressure swing adsorption unit is connected to the output end of the purification device through a first separator; A secondary pressure swing adsorption unit, wherein the input end of the secondary pressure swing adsorption unit is connected to the first output end of the primary pressure swing adsorption unit through an oil removal tower and a first heater in sequence; the first output end of the secondary pressure swing adsorption unit is connected to a gas buffer tank through a vacuum analysis unit.

2. The system according to claim 1, characterized in that: The conveying device includes a conveyor belt and an elevator; The conveyor belt is connected to the material output end of the low-temperature pyrolysis furnace, the end of the conveyor belt is connected to the input end of the elevator, and the output end of the elevator is connected to the material input end of the melter-gasifier.

3. The system according to claim 1, characterized in that: The secondary pressure swing adsorption device also includes a three-stage pressure swing adsorption unit, the input end of the three-stage pressure swing adsorption unit is connected to the second output end of the secondary pressure swing adsorption unit through a cooler; the first output end of the three-stage pressure swing adsorption unit is connected to a second heater, and the second heater is sequentially connected to a dryer and a second separator; The secondary pressure swing adsorption device also includes a downstream gas buffer tank, a desorption gas buffer tank and a steam unit; The second output end of the first-stage pressure swing adsorption unit, the fourth output end of the second-stage pressure swing adsorption unit, and the second output end of the third-stage pressure swing adsorption unit are respectively connected to the input end of the downstream gas buffer tank; The third output end of the first-stage pressure swing adsorption unit, the third output end of the second-stage pressure swing adsorption unit, and the third output end of the third-stage pressure swing adsorption unit are respectively connected to the input end of the desorption gas buffer tank, and the output end of the desorption gas buffer tank is connected to the second heater; The steam unit is connected to the first heater and the second heater, respectively.

4. A method for producing hydrogen by melting and gasifying organic waste using a redox method, applied to the system described in any one of claims 1 to 3, characterized in that: include: The low-temperature pyrolysis furnace pyrolyzes the first organic solid waste to generate a carbon redox catalyst and a first gas; The melter-gasifier melts the carbon redox catalyst, quicklime and the second organic solid waste to generate a second gas; The purification device purifies the first gas and the second gas to obtain hydrogen; The secondary pressure swing adsorption device performs secondary pressure swing adsorption on the hydrogen to generate purified hydrogen.

5. The method according to claim 4, characterized in that Before the low-temperature pyrolysis furnace pyrolyzes the first organic solid waste, the method further comprises: Air separators separate nitrogen and oxygen from the air; Injecting nitrogen into the multi-stage gate valves of the low-temperature pyrolysis furnace and the melt-gasification furnace; Inject oxygen into the air mixing port of the melter-gasifier.

6. The method according to claim 4, characterized in that The melter-gasifier melts the carbon redox catalyst, quicklime and the second organic solid waste to generate the second gas, specifically comprising: Drying and oxidizing and reducing the carbon redox catalyst, quicklime and second organic solid waste to generate second gas and liquid slag; The liquid slag is water quenched to form a glass-ceramic body.

7. The method according to claim 4, characterized in that The secondary pressure swing adsorption device performs secondary pressure swing adsorption of the hydrogen to generate purified hydrogen, specifically comprising: Desulfurizing and purifying the hydrogen to obtain desulfurized hydrogen; After primary pressure swing adsorption and secondary purification of the desulfurized hydrogen, primary pressure swing adsorption hydrogen is obtained; The first-stage pressure swing adsorption hydrogen is subjected to second-stage pressure swing adsorption to obtain the purified hydrogen.

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