Biomass gasification system coupled with water electrolysis hydrogen production

Abstract

The utility model discloses a water electrolysis hydrogen production coupling biomass gasification 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 melting furnace, a waste heat boiler and a purification device, oxygen which is prepared in electrolytic hydrogen production and almost has no utilization value is utilized and fed into the biomass gasification furnace to react with biomass to obtain biomass gas with a high calorific value, and compared with biomass gas produced by a conventional biomass gasification system, the obtained biomass gas with the high calorific value has the advantages that the calorific value is higher, and meanwhile, the utilization value of the biomass gas with the high calorific value is higher. The hydrogen production system can produce hydrogen and also can prepare biomass gas with a high calorific value at the same time, so that the overall economic benefit of the hydrogen production system is improved, and the development of the hydrogen energy industry and the biomass industry is facilitated; and the gasification efficiency and the waste heat utilization efficiency of the whole system are high, and the economic benefits of the system are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic hydrogen production, in particular to a hydrogen production by electrolyzing water coupled with a biomass gasification system. Background Art

[0002] Since the industrial revolution in the 18th century, traditional fossil fuels (coal, oil, natural gas) have been the most important primary energy sources in human development. However, with the extensive exploitation and use of traditional fossil fuels, problems such as energy depletion, climate change, and ecological environment issues have become increasingly prominent. Therefore, vigorously developing and utilizing renewable energy has become a world consensus. However, renewable energy has certain limitations, and there are often certain problems in a single energy supply. For example, solar energy and wind energy have intermittent, unstable, and uncontrollable non-steady-state characteristics, which will cause impacts on the power grid when renewable energy is connected to the grid for power transmission, resulting in fluctuations and insecurity of the power grid, and making a large amount of renewable energy electricity unable to be connected to the grid for use.

[0003] Hydrogen energy has the advantages of high calorific value, pollution-free, and rich sources, and is regarded as one of the energy solutions in the "post-oil era". There are many ways to produce hydrogen industrially, and the common one is hydrogen production by electrolyzing water. Existing electrolytic hydrogen production systems will all obtain a large amount of oxygen. This large amount of oxygen is either directly discharged into the atmosphere or stored through a gas storage tank. Direct discharge will lead to waste of oxygen, and storing oxygen will bring storage costs to manufacturers, and the economic benefits of oxygen conversion are relatively low, resulting in relatively low economic benefits of the system. Therefore, it is necessary to propose a new solution to solve the above problems. Summary of the Utility Model

[0004] In view of this, aiming at the deficiencies existing in the prior art, the main purpose of the utility model is to provide a hydrogen production by electrolyzing water coupled with a biomass gasification system, which can effectively solve the problem of low economic benefits of the existing electrolytic hydrogen production system.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A hydrogen production by electrolyzing water coupled with a biomass gasification system includes an electrolytic water device, a first gas-liquid separator, a second gas-liquid separator, a hydrogen purification device, a preheater, a biomass gasification furnace, a melting furnace, a waste heat boiler, and a purification device;

[0007] The electrolytic water device has a hydrogen output end and an oxygen output end; the input end of the first gas-liquid separator is communicated with the hydrogen output end; the input end of the second gas-liquid separator is communicated with the oxygen output end; the input end of the hydrogen purification device is communicated with the output end of the first gas-liquid separator; the input end of the preheater is communicated with the output end of the second gas-liquid separator; the biomass gasifier has a gasification area where biomass is placed, and the gasification area is communicated with the output end of the preheater; the input end of the melting furnace is communicated with the output end of the preheater and the output end of the biomass gasifier; the input end of the waste heat boiler is communicated with the output end of the melting furnace, and the output end of the waste heat boiler is communicated with the input end of the preheater; the purification device is communicated with the output end of the preheater.

[0008] As a preferred solution, the electrolytic water device is one of an alkaline electrolytic water 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 gasifier is one of a fixed-bed gasifier, a fluidized-bed gasifier, and a moving-bed gasifier.

[0010] As a preferred solution, the melting furnace is a cyclone melting furnace.

[0011] A method for preparing high-calorific value gas is obtained by using the aforementioned electrolytic hydrogen production coupled with biomass gasification system. The biomass includes cellulose, hemicellulose, and lignin. The gasification area is communicated with the output end of the preheater, and in the gasification area, the ratio of biomass to oxygen is 1 kg: 0.25 - 0.5 m 3 , and the reaction temperature in the gasification area is 650 - 850 °C.

[0012] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions:

[0013] By utilizing the almost worthless oxygen produced in electrolytic hydrogen production and sending it into the biomass gasifier to react with biomass to obtain high-calorific value biomass gas, the obtained high-calorific value biomass gas has a higher calorific value compared with the biomass gas produced by a conventional biomass gasification system. At the same time, the hydrogen production system can also prepare high-calorific value biomass gas while producing hydrogen, improving the overall economic efficiency of the hydrogen production system and contributing to the development of the hydrogen energy industry and the biomass industry; and the overall gasification efficiency and waste heat utilization efficiency of the system are high, further improving the economic efficiency of the system.

[0014] To more clearly elaborate on the structural features and functions of the present invention, the following will describe the present invention in detail with reference to the drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a preferred embodiment of the present utility model.

[0016] Description of the attached drawing reference numerals:

[0017] 10. Electrolyzed water device 11. Hydrogen output end

[0018] 12. Oxygen output end 20. First gas-liquid separator

[0019] 30. Second gas-liquid separator 40. Hydrogen purification device

[0020] 50. Preheater 60. Biomass gasification furnace

[0021] 70. Melting furnace 80. Waste heat boiler

[0022] 90. Purification device. Detailed implementation manners

[0023] Please refer to Figure 1 As shown, the present utility model discloses a system for coupling electrolyzed water hydrogen production with biomass gasification, which includes an electrolyzed water device 10, a first gas-liquid separator 20, a second gas-liquid separator 30, a hydrogen purification device 40, a preheater 50, a biomass gasification furnace 60, a melting furnace 70, a waste heat boiler 80, and a purification device 90.

[0024] The electrolyzed water device 10 has a hydrogen output end 11 and an oxygen output end 12; the input end of the first gas-liquid separator 20 is communicated with the hydrogen output end 11; the input end of the second gas-liquid separator 30 is communicated with the oxygen output end 12; the input end of the hydrogen purification device 40 is communicated with the output end of the first gas-liquid separator 20; the input end of the preheater 50 is communicated with the output end of the second gas-liquid separator 30; the biomass gasification furnace 60 has a gasification area (not shown in the figure), biomass (not shown in the figure) is placed in the gasification area, and the gasification area is communicated with the output end of the preheater 50; the input end of the melting furnace 70 is communicated with the output end of the preheater 50 and the output end of the biomass gasification furnace 60; the input end of the waste heat boiler 80 is communicated with the output end of the melting furnace 70, and the output end of the waste heat boiler 80 is communicated with the input end of the preheater 50; the purification device 90 is communicated with the output end of the preheater 50. Specifically, the electrolyzed water device 10 is one of an alkaline electrolyzed water device, a proton exchange membrane electrolysis device, an anion exchange membrane electrolysis device, and a solid oxide electrolysis device; the biomass gasification furnace 60 is one of a fixed-bed gasification furnace, a fluidized-bed gasification furnace, and a moving-bed gasification furnace; the melting furnace 70 is a cyclone melting furnace.

[0025] The working principle of the system for coupling electrolyzed water hydrogen production with biomass gasification is described in detail as follows:

[0026] First, the electrolyzer 10 electrolyzes water to generate hydrogen and oxygen. After the hydrogen is separated from liquid by the first gas-liquid separator 20, it enters the hydrogen purification device 40 for purification, thereby obtaining pure hydrogen. After the oxygen is separated from liquid by the second gas-liquid separator 30, it enters the preheater 50 for preheating. Then, a part of the preheated oxygen is sent into the biomass gasifier 60 to react with biomass to generate fuel gas. Next, the fuel gas enters the melting furnace 70. The preheater 50 sends the other part of the preheated oxygen and the fuel gas into the melting furnace 70 at the same time. The other part of the preheated oxygen removes ash and tar in the fuel gas to obtain a mixed gas. The mixed gas passes through the waste heat boiler 80 and the preheater 50 in sequence, enabling the waste heat boiler 80 to generate steam and use the steam for power generation or other corresponding operations. The preheater 50 absorbs the heat of the mixed gas when the mixed gas passes through, and uses the heat to preheat the oxygen generated by electrolysis. Finally, the mixed gas passes through the purification device 90, and high-calorific-value fuel gas is ultimately obtained.

[0027] The present utility model also discloses a method for preparing high-calorific-value fuel gas, which is prepared by using the aforementioned hydrogen production by electrolyzing water coupled with a biomass gasification system. The biomass includes cellulose, hemicellulose, and lignin, and in the gasification region, the ratio of biomass to oxygen is 1 kg: 0.25 - 0.5 m 3 , and the reaction temperature in the gasification region is 650 - 850 °C; the biomass first undergoes oxygen-deficient combustion in the biomass gasifier 60, and then undergoes thermal decomposition reaction and redox reaction. The specific series of reaction equations are as follows:

[0028] 3C 6 H 10 O 5 →8H 2 O + C 6 H 8 O + 3CO 2 + CH 4 + H 2 + 8C;

[0029] C + O 2 →CO 2 ;

[0030] 2C + O 2 →2CO;

[0031] C + H 2 O → CO + H 2 ;

[0032] C + CO 2 →2CO;

[0033] C + 2H 2 →CH 4 ;

[0034] CO + H 2 O → CO 2 + H 2 ;

[0035] CO 2 + H 2 → CO + H 2 O。

[0036] The design focus of the present utility model lies in:

[0037] By utilizing the almost useless oxygen produced in electrolytic hydrogen production and feeding it into a biomass gasifier to react with biomass and obtain high-calorific-value biomass gas. Compared with the biomass gas produced by a conventional biomass gasification system, the obtained high-calorific-value biomass gas has a higher calorific value. At the same time, the hydrogen production system can also produce high-calorific-value biomass gas while producing hydrogen, improving the overall economic efficiency of the hydrogen production system and contributing to the development of the hydrogen energy industry and the biomass industry; and, the overall gasification efficiency and waste heat utilization efficiency of the system are high, further improving the economic efficiency of the system.

[0038] The above is only a preferred embodiment of the present utility model, and does not impose any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A water electrolysis hydrogen production coupled with biomass gasification system, 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 gasification furnace, a melting furnace, a waste heat boiler and a purification 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, biomass is placed in the gasification area, and the gasification area is connected to the output end of the preheater; the input end of the melting furnace is connected to the output end of the preheater and the output end of the biomass gasifier; the input end of the waste heat boiler is connected to the output end of the melting furnace, 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.

2. The water electrolysis hydrogen production coupled with biomass gasification system according to claim 1, 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.

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

4. The water electrolysis hydrogen production coupled with biomass gasification system according to claim 1, characterized in that: The melting furnace is a cyclone melting furnace.

Images