Water electrolysis hydrogen production coupled biomass gasification hydrogen production system

Abstract

The utility model discloses a water electrolysis hydrogen production coupling biomass gasification hydrogen production system which comprises a water electrolysis device, a first gas-liquid separator, a second gas-liquid separator, a hydrogen purification device, a preheater, a biomass gasification furnace, a conversion device, a waste heat boiler, a purification device and a PSA (Pressure Swing Adsorption) device, oxygen obtained through water electrolysis is fed into the biomass gasification furnace to prepare hydrogen-rich biomass gas, then hydrogen is prepared and purified from the biomass hydrogen-rich biomass gas, the oxygen generated through water electrolysis is efficiently utilized, meanwhile, the hydrogen is prepared through the biomass hydrogen-rich biomass gas, the yield and purity of biomass hydrogen production are improved, the cost of biomass hydrogen production is effectively reduced, and the method is suitable for industrial production. And compared with a traditional electrolytic hydrogen production system, the hydrogen yield of electrolytic hydrogen production is also improved, and the economic benefits of the system are improved.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen production systems, in particular to a hydrogen production system that couples water electrolysis with biomass gasification. Background Art

[0002] Hydrogen energy has the advantages of high calorific value, being pollution-free, and having abundant sources. There are many ways to produce hydrogen industrially, the most common of which is water electrolysis. Existing electrolytic hydrogen production systems all produce large amounts of oxygen, which is either discharged directly into the atmosphere or stored in gas tanks. Direct discharge results in oxygen waste, while storing oxygen incurs storage costs for manufacturers. Furthermore, the economic benefits of oxygen conversion are low, resulting in a relatively low economic benefit for the system. Therefore, it is necessary to propose a new solution to address these issues. Utility Model Content

[0003] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a water electrolysis hydrogen production coupled with biomass gasification hydrogen production system, which can effectively solve the problem of low economic efficiency of the existing electrolysis hydrogen production system.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A water electrolysis hydrogen production coupled with biomass gasification hydrogen production system, comprising a water electrolysis device, a first gas-liquid separator, a second gas-liquid separator, a hydrogen purification device, a preheater, a biomass gasifier, a conversion device, a waste heat boiler, a purification device, and a PSA adsorption device;

[0006] The water electrolysis device has a hydrogen output end and an oxygen output end; the input end of the first gas-liquid separator is connected to the hydrogen output end; the input end of the second gas-liquid separator is connected to the oxygen output end; the input end of the hydrogen purification device is connected to the output end of the first gas-liquid separator; the input end of the preheater is connected to the output end of the second gas-liquid separator; the biomass gasifier has a gasification area, in which biomass is placed, and the gasification area is connected to the output end of the preheater; the input end of the conversion device is connected to the output end of the biomass gasifier; the input end of the waste heat boiler is connected to the output end of the conversion device, the output end of the waste heat boiler is connected to the input end of the conversion device to form a loop, and the output end of the waste heat boiler is connected to the input end of the preheater; the purification device is connected to the output end of the preheater; the input end of the PSA adsorption device is connected to the output end of the purification device.

[0007] As a preferred solution, a buffer tank for storing oxygen is provided between the second gas-liquid separator and the preheater. The buffer tank can serve as energy storage. The water electrolysis device operates when electricity prices are low, and the generated oxygen is stored for use in the subsequent biomass gasification furnace process, thereby reducing the operating cost of the water electrolysis part.

[0008] As a preferred solution, the water electrolysis device is one of an alkaline water electrolysis device, a proton exchange membrane electrolysis device, an anion exchange membrane electrolysis device and a solid oxide electrolysis device.

[0009] As a preferred solution, the biomass gasification furnace is one of a fixed-bed gasification furnace, a fluidized-bed gasification furnace and a moving-bed gasification furnace.

[0010] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0011] By sending the oxygen produced by water electrolysis into a biomass gasifier to produce hydrogen-rich biomass gas, and then producing and purifying hydrogen from the biomass hydrogen-rich biomass gas, while efficiently utilizing the oxygen produced by water electrolysis, it is also used to produce hydrogen, thereby improving the yield and purity of biomass hydrogen production, effectively reducing the cost of biomass hydrogen production, and compared with traditional electrolysis hydrogen production systems, it also improves the hydrogen yield of electrolysis hydrogen production and improves the economic benefits of the system.

[0012] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of a preferred embodiment of the present utility model.

[0014] Description of the accompanying drawings:

[0015] 10. Water electrolysis device 11. Hydrogen output terminal

[0016] 12. Oxygen output end 21. First gas-liquid separator

[0017] 22. Second gas-liquid separator 30. Hydrogen purification device

[0018] 40. Preheater 50. Biomass gasifier

[0019] 60. Conversion device 70. Waste heat boiler

[0020] 81. Purification device 82. PSA adsorption device

[0021] 90. Buffer tank. DETAILED DESCRIPTION

[0022] Please refer to Figure 1 As shown, it shows the specific structure of a preferred embodiment of the present invention, including a water electrolysis device 10, a first gas-liquid separator 21, a second gas-liquid separator 22, a hydrogen purification device 30, a preheater 40, a biomass gasifier 50, a conversion device 60, a waste heat boiler 70, a purification device 81 and a PSA adsorption device 82.

[0023] The water electrolysis device 10 has a hydrogen output end 11 and an oxygen output end 12; the input end of the first gas-liquid separator 21 is connected to the hydrogen output end 11; the input end of the second gas-liquid separator 22 is connected to the oxygen output end 12; the input end of the hydrogen purification device 30 is connected to the output end of the first gas-liquid separator 21; the input end of the preheater 40 is connected to the output end of the second gas-liquid separator 22; the biomass gasifier 50 has a gasification area (not shown in the figure), in which biomass is placed. The gasification area is connected to the output end of the preheater 40; the input end of the conversion device 60 is connected to the output end of the biomass gasifier 50; the input end of the waste heat boiler 70 is connected to the output end of the conversion device 60, the output end of the waste heat boiler 70 is connected to the input end of the conversion device 60 to form a loop, and the output end of the waste heat boiler 70 is connected to the input end of the preheater 40; the purification device 81 is connected to the output end of the preheater 40; the input end of the PSA adsorption device 82 is connected to the output end of the purification device 81. Specifically, the water electrolysis device 10 is one of an alkaline water electrolysis device, a proton exchange membrane electrolysis device, an anion exchange membrane electrolysis device and a solid oxide electrolysis device; the biomass gasification furnace 50 is one of a gasification fixed bed, a gasification fluidized bed and a gasification moving bed; and a buffer tank 90 for storing oxygen is provided between the second gas-liquid separator 22 and the preheater 40. The buffer tank 90 can play the role of energy storage. The water electrolysis device operates when the electricity price is low, and the generated oxygen is stored for use in the subsequent biomass gasification furnace 50 process, thereby reducing the operating cost of the water electrolysis part.

[0024] The working principle of the water electrolysis hydrogen production coupled with biomass gasification hydrogen production system is described in detail as follows:

[0025] First, the water electrolysis device 10 electrolyzes water to generate hydrogen and oxygen. The hydrogen is separated into gas and liquid by the first gas-liquid separator 21 and then enters the hydrogen purification device 30 for purification, thereby obtaining pure hydrogen. The waste heat boiler 70 heats the water to form steam and passes it through the preheater 40. The preheater absorbs heat to preheat the oxygen. The oxygen is separated into gas and liquid by the second gas-liquid separator 22 and then enters the preheater 40 for preheating. Then, a portion of the preheated oxygen is sent to the biomass gasifier 50 to react with the biomass to generate hydrogen-rich synthesis gas. Then, the hydrogen-rich synthesis gas enters the conversion device 6 0, a portion of the water vapor generated by the waste heat boiler 70 enters the shift device 60 and reacts with the hydrogen-rich synthesis gas to generate hydrogen. The reaction principle is CO + H2O → CO2 + H2, resulting in a mixed gas. The mixed gas then passes through the waste heat boiler 70 and the preheater 40 in sequence, allowing the waste heat of the mixed gas to be used to generate steam. The preheater 50 absorbs the heat of the mixed gas as it passes through and uses the heat to preheat the oxygen generated by electrolysis. The mixed gas passes through the purification device 81 and the PSA adsorption device 82 to obtain hydrogen.

[0026] The biomass in the biomass gasifier 50 includes cellulose, hemicellulose and lignin, and in the gasification area, the ratio of biomass to oxygen is 1kg:0.25-0.5m 3 The reaction temperature in the gasification area is 950-1250°C. The biomass is first burned under oxygen in the biomass gasifier 50, and then thermal decomposition and redox reactions occur. The specific series of reaction equations are as follows:

[0027] 3C6H 10 O5→8H2O+C6H8O+3CO2+CH4+H2+8C;

[0028] C+O2→CO2;

[0029] 2C+O2→2CO;

[0030] C+H2O→CO+H2;

[0031] C+CO2→2CO;

[0032] C+2H2→CH4;

[0033] CO+H2O→CO2+H2;

[0034] CO2+H2→CO+H2O.

[0035] In addition, the internal reaction temperature of the conversion device 60 is 850-1100°C. When water vapor is introduced into the conversion device 60, CO in the biomass gasification gas undergoes a conversion reaction under the action of the catalyst to generate CO2 and H2, thereby increasing the hydrogen yield.

[0036] The design focus of the utility model is to feed the oxygen generated by water electrolysis into a biomass gasifier to produce hydrogen-rich biomass gas, and then produce and purify hydrogen from the biomass hydrogen-rich biomass gas. While efficiently utilizing the oxygen generated by water electrolysis, it is also used to produce hydrogen, thereby improving the yield and purity of biomass hydrogen production, effectively reducing the cost of biomass hydrogen production, and compared with traditional electrolytic hydrogen production systems, also improving the hydrogen yield of electrolytic hydrogen production, thereby improving the economic benefits of the system.

[0037] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A system for producing hydrogen by electrolysis of water coupled with biomass gasification, characterized by: It includes a water electrolysis device, a first gas-liquid separator, a second gas-liquid separator, a hydrogen purification device, a preheater, a biomass gasifier, a conversion device, a waste heat boiler, a purification device and a PSA adsorption device; The water electrolysis device has a hydrogen output end and an oxygen output end; the input end of the first gas-liquid separator is connected to the hydrogen output end; the input end of the second gas-liquid separator is connected to the oxygen output end; the input end of the hydrogen purification device is connected to the output end of the first gas-liquid separator; the input end of the preheater is connected to the output end of the second gas-liquid separator; the biomass gasifier has a gasification area, in which biomass is placed, and the gasification area is connected to the output end of the preheater; the input end of the conversion device is connected to the output end of the biomass gasifier; the input end of the waste heat boiler is connected to the output end of the conversion device, the output end of the waste heat boiler is connected to the input end of the conversion device to form a loop, and the output end of the waste heat boiler is connected to the input end of the preheater; the purification device is connected to the output end of the preheater; the input end of the PSA adsorption device is connected to the output end of the purification device.

2. The water electrolysis coupled biomass gasification hydrogen production system according to claim 1 is characterized in that: A buffer tank for storing oxygen is provided between the second gas-liquid separator and the preheater.

3. The water electrolysis coupled biomass gasification hydrogen production system according to claim 1 is characterized in that: The water electrolysis device is one of an alkaline water electrolysis device, a proton exchange membrane electrolysis device, an anion exchange membrane electrolysis device and a solid oxide electrolysis device.

4. The water electrolysis coupled biomass gasification hydrogen production system according to claim 1 is characterized in that: The biomass gasification furnace is one of a gasification fixed bed, a gasification fluidized bed and a gasification moving bed.

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