Slurry preparation system for biomass hydrogen production

Abstract

The utility model provides a slurry preparation system for biomass hydrogen production, which comprises a storage hopper used for storing raw materials, a screw conveyer arranged at the bottom end of the storage hopper, a belt conveyer butted with the tail end of the screw conveyer, a millstone machine butted with the other end of the belt conveyer, a medium-concentration pump communicated with a bottom outlet of the millstone machine, and a high-concentration pump communicated with the middle outlet of the millstone machine. An outlet of the medium-concentration pump is connected with the filter through a slurry conveying pipe, a slurry outlet of the filter is connected with the catalytic oxidation process system through a slurry pipe and used for subsequent electrolytic hydrogen production, and a slag cake outlet of the filter is in butt joint with an inlet of the millstone machine through a slag cake conveyor. The system can be used for preparing slurry in advance in the biomass hydrogen production process, and can be directly butted with a subsequent hydrogen production platform to complete the whole hydrogen production process flow, so that the hydrogen production efficiency is improved; moreover, the system adopts a modular design, so that the system can be small and light, and is convenient to assemble and low in energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydropower station large unit overhauling equipment, concretely is a slurry preparation system of hydrogen preparation of biomass. BACKGROUND

[0002] Hydrogen energy, as a clean energy containing high energy and realizing "zero carbon" emission, will play an important role in promoting the energy structure of low-carbon society. Not only can it be used as a vehicle energy to drive vehicles, but also can be converted into electric energy by hydrogen fuel cell or mixed with hydrocarbon fuel to release heat energy, so as to realize wide interconnection and complementation with various energy forms such as electric power, heat, oil and gas, and coal in the energy field, and further optimize the energy structure. However, as a secondary energy, hydrogen energy needs to go through preparation or energy conversion process to obtain. From the perspective of low carbon emission, ideal hydrogen energy should come from renewable energy conversion, such as using solar energy and wind power to generate electricity to electrolyze water to prepare hydrogen. This way of preparing hydrogen energy is called "green hydrogen", and its preparation process almost does not produce carbon emission. But unfortunately, the current electrolysis of water to prepare hydrogen technology faces huge energy consumption challenge, about 5-6kWh of electricity is needed to produce 1Nm³ of hydrogen, which undoubtedly brings huge economic pressure.

[0003] In order to reduce the cost of hydrogen production, a new way of hydrogen production from biomass as renewable energy. Biomass, especially lignocellulosic biomass, can store solar energy through photosynthesis and has the characteristics of rapid regeneration. In the process of hydrogen production, biomass can release chemical energy, thereby reducing the consumption of electric energy. Patent CN114182294A proposes an innovative double catalyst system and method for electrochemical degradation of biomass to refine organic waste and produce hydrogen. This method can significantly reduce the consumption of electric energy in the process of hydrogen production.

[0004] Although hydrogen energy has many advantages, its application still faces the problem of storage and transportation. Hydrogen energy application faces the problem of storage and transportation, especially the need for a wide range of hydrogen refueling stations for vehicles. Hydrogen is light and difficult to liquefy, transportation costs are high, and pipeline transportation also faces multiple challenges. Therefore, building a distributed hydrogen supply system and using mobile hydrogen production platforms has become a solution. At present, small-sized on-board water electrolysis devices (CN106637279A, CN101941418B), mobile devices that use organic liquid hydrogen storage raw materials to reform hydrogen, and other technologies are being researched. Biomass resources, due to their widespread distribution in nature, have attracted much attention, including agricultural and forestry waste, organic waste liquid produced by the papermaking and fermentation industries, and kitchen organic waste produced in daily life. These resources are often in a scattered state, and if they are processed on a large scale, they will bring high transportation costs. In view of this, the development of a mobile biomass direct electrolysis hydrogen production platform is particularly important, as it can not only avoid the problem of centralized transportation of scattered biomass resources, but also build a distributed hydrogen supply system with small modular devices, thereby realizing the localization of biomass conversion and the flexibility and efficiency of hydrogen production and supply. It is worth noting that compared to small-sized water electrolysis devices, mobile biomass direct electrolysis platforms do not require high-purity water sources and water purification devices, and can process high-concentration organic wastewater to produce hydrogen, achieving environmental benefits and integrating multiple resources. Prior to this invention, the inventors have applied for patents with patent numbers 202111336320.0 and CN106676564B, which provide a method for converting biomass into hydrogen gas through an electrochemical method. The hydrogen production device in this invention cannot be moved and must be built in a fixed location. During the hydrogen production process, the raw material needs to be ground into slurry in advance, and then input into the hydrogen production platform for subsequent hydrogen production processes. Currently, the prepared slurry is usually transported centrally. This results in a certain disconnection between the slurry preparation stage and the subsequent hydrogen production process stage, which seriously affects the hydrogen production efficiency. Practical new type content

[0005] In view of the shortcomings of the prior art, the main purpose of the present application is to provide a biomass hydrogen production slurry preparation system. This system can be used for preparing slurry in advance in the biomass hydrogen production process and can be directly connected to the subsequent hydrogen production platform to complete the entire hydrogen production process, thereby improving the hydrogen production efficiency. Moreover, this system adopts modular design, which can realize the small size and light weight of the system, and is easy to assemble and has low energy consumption.

[0006] In order to realize the above technical features, the biomass hydrogen production slurry preparation system is characterized in that: a storage hopper for storing raw materials is arranged, a spiral conveyor is arranged at the bottom end of the storage hopper, a belt conveyor is connected to the end of the spiral conveyor, the other end of the belt conveyor is connected to a mill machine, a medium concentration pump is connected to the bottom outlet of the mill machine, a slurry conveying pipe is connected between the outlet of the medium concentration pump and a filter, a slurry outlet of the filter is connected to a catalytic oxidation process system through a slurry pipe and is used for subsequent electrolytic hydrogen production, and a residue cake outlet of the filter is connected to the inlet of the mill machine through a residue cake conveyor.

[0007] Preferably, the biomass hydrogen production slurry preparation system further comprises a material transport vehicle for dispersing and transporting materials, and the material transport vehicle is used for transporting the raw materials to the storage hopper.

[0008] Preferably, the belt conveyor is arranged in an inclined manner, the low end of the belt conveyor is connected to the outlet of the spiral conveyor, and the high end of the belt conveyor is arranged directly above the inlet of the mill machine.

[0009] Preferably, the mill machine is a high-concentration mill machine, the top end of the high-concentration mill machine is provided with a mill feeding hopper, and the bottom end of the high-concentration mill machine is provided with a mill discharging hopper.

[0010] Preferably, the mill machine has a pulp volume concentration of 45.0%-50.0% and a pulp gap of 0.25mm-0.30mm.

[0011] Preferably, the pulp inlet of the medium concentration pump is connected to the outlet of the mill machine, and the pulp outlet of the medium concentration pump is connected to the slurry conveying pipe.

[0012] Preferably, the filter is a disc vacuum filter or a plate-and-frame filter press.

[0013] Preferably, the slurry filtered by the filter has a fineness of 10-20µm.

[0014] Preferably, the raw materials are medicinal residues or distiller's grains.

[0015] The biomass hydrogen production slurry preparation system has the following beneficial effects:

[0016] 1. The system can be used for preparing slurry in advance in the biomass hydrogen production process, can be directly connected to a subsequent hydrogen production platform, can complete the entire hydrogen production process, and can improve the hydrogen production efficiency.

[0017] 2. The biomass hydrogen production slurry preparation system can effectively tear and grind the fibers of biomass (medicinal residues or distiller's grains) and disc mill the proteins, and can increase the raw material utilization rate of biomass electrolytic hydrogen production.

[0018] 3. The hierarchical transportation processing design of the utility model, it is a small, light weight, convenient assembly, can be convenient for the transportation and assembly of equipment, provide convenient raw material supply for biomass electrolysis hydrogen production.

[0019] 4. The utility model discloses can according to the slurry particle size of biomass electrolysis hydrogen production needs, adjust the fineness by adjusting the pulp grinding gap of the pulp grinder, adjust the vacuum degree of filter and filter cloth weave density control final slurry fineness.

[0020] 5. The biomass hydrogen production slurry preparation device of the utility model, preparation process is simple, and the process is simple, and the fineness of the pulp grinding industry of high -efficient processing grinding biomass (dregs or vinasse) reaches 10-20µm (about 600 mesh), is favorable for the yield of hydrogen and reduces the slurry energy consumption ratio. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described below in connection with the drawings and examples.

[0022] Figure 1 It is the system diagram of the utility model.

[0023] Figure 2 It is (a) (b) (c) (d) for the contrastive drawing of grinding assembly.

[0024] In the drawing: material transport vehicle 1, storage hopper 2, screw conveyor 3, belt conveyor 4, medium concentration pump 5, grinding disc machine 6, grinding disc discharge hopper 7, grinding disc feed hopper 8, dregs cake conveyor 9, slurry inlet 10, slurry pipe 11, filter 12, slurry pipe 13. DETAILED DESCRIPTION

[0025] The embodiment of the utility model will be further described below in connection with the drawings.

[0026] Example 1:

[0027] Referring to Figure 1The application discloses a slurry preparation system for hydrogen production from biomass, which comprises a storage hopper 2 for storing raw materials, a spiral conveyor 3 arranged at the bottom end of the storage hopper 2, a belt conveyor 4 connected to the end of the spiral conveyor 3, another end of the belt conveyor 4 connected to a mill 6, a medium-concentration pump 5 connected to the bottom outlet of the mill 6, a filter 12 connected to the outlet of the medium-concentration pump 5 through a slurry conveying pipe 11, a slurry outlet of the filter 12 connected to a catalytic oxidation process system through a slurry pipe 13 and used for subsequent electrolytic hydrogen production, and a cake outlet of the filter 12 connected to the inlet of the mill 6 through a cake conveying machine 9. The slurry preparation system can be used for preparing slurry in advance in a hydrogen production process from biomass, directly connected to a subsequent hydrogen production platform, complete the whole hydrogen production process, and improve the hydrogen production efficiency. Moreover, the system adopts a modular design, can realize small size and light weight of the system, and is convenient to equip and low in energy consumption. In the specific preparation process, the raw materials are conveyed to the belt conveyor 4 through the spiral conveyor 3, conveyed to the mill 6 through the belt conveyor 4, effectively ground and crushed through the mill 6, filtered through the filter 12, and finally obtained to be used for subsequent electrolytic hydrogen production.

[0028] Further, the slurry preparation system further comprises a material conveying vehicle 1 for conveying dispersed materials, and the material conveying vehicle 1 is used for conveying the raw materials to the storage hopper 2. The material conveying vehicle 1 is convenient for collecting and conveying the dispersed materials.

[0029] Further, the belt conveyor 4 adopts an inclined arrangement structure, the low end of the belt conveyor 4 is connected to the outlet of the spiral conveyor 3, and the high end of the belt conveyor 4 is arranged directly above the inlet of the mill 6. The belt conveyor 4 is convenient for realizing automatic feeding of the materials and improving the feeding efficiency.

[0030] Further, the mill 6 adopts a high-concentration mill, the top end of the high-concentration mill is provided with a mill feeding hopper 8, and the bottom end of the high-concentration mill is provided with a mill discharging hopper 7. The mill 6 can be used for further grinding and crushing the raw materials, so that the slurry can meet the process requirements of subsequent electrolytic hydrogen production.

[0031] Further, the volume concentration of the milled slurry of the mill 6 is 45.0%-50.0%, and the milling gap is 0.25mm-0.30mm. The slurry parameters meet the requirements of subsequent hydrogen production.

[0032] Further, the slurry inlet 10 of the medium-concentration pump 5 is connected to the outlet of the mill 6, and the slurry outlet of the medium-concentration pump 5 is connected to the slurry conveying pipe 11. The medium-concentration pump 5 can well realize conveying of the slurry.

[0033] Further, the filter 12 adopts a disc vacuum filter or a plate-and-frame filter press. The filter 12 can achieve good filtering effect.

[0034] Further, the slurry after filtering by the filter 12 has a fineness of 10-20 µm. The filtering parameter requirement can meet the process requirement of subsequent hydrogen production.

[0035] Further, the raw material adopts medicine residues or distiller's grains. The raw material is easier to be ground, so that the raw material required for hydrogen production from biomass can be prepared.

[0036] Embodiment 2:

[0037] Specifically referring to Figure 2 , the application provides a slurry preparation system for hydrogen production from biomass. In the process of hydrogen production by electrolysis of biomass, the treatment of raw material is also very important, and the energy consumption of grinding process cannot be ignored. A grinding device for slurry for hydrogen production from biomass is provided.

[0038] Through the feeding pilot study, the raw material of the industrial demonstration project is Chinese herbal medicine residues and distiller's grains. On-site sampling observation shows that the Chinese medicine residues are mainly composed of woody and herbaceous plants. After high-temperature cooking, the fiber cells are destroyed, the structure becomes loose, the silicified epidermis becomes soft, and part of the lignin is dissolved, and the essential fibers are dissociated. The distiller's grains are fermented by high-temperature evaporation of grains, and the protein is decomposed and converted into straight carbon chain small molecules, which become softer. This creates good conditions for the selection of the next step of the grinding equipment and the reduction of the energy consumption of the grinding process.

[0039] The type of grinding equipment is also very important, as shown in Figure 2 . The main components of the raw material are plant fibers and proteins. To grind a plant body like the one in the right figure, Figure 2 (a) is to convert energy into shear force to tear fibers, which has a double effect of tearing and grinding (friction), and has the highest energy utilization rate. Figure 2 (b) is to convert energy into impact force to break the plant body, which has high energy loss; Figure 2 (c) is to cut the plant body with high-speed blades, which converts energy into shear stress, but the fineness is difficult to meet the requirements; Figure 2 (d) is to convert energy into extrusion of the plant body, which has the worst grinding effect due to the softness and fiber type. The grinding effects of different devices are different, and the consumed electric energy is also different. Through the analysis of energy use efficiency, the purpose is to find a grinding device that is most suitable and has the lowest energy consumption, and to efficiently grind the medicine residues and distiller's grains to meet the fineness requirement of the next process. The traditional grinding equipment for metallurgy, metal and non-metallic industry (such as Figure 2 (b), Figure 2(d) Cannot be selected (low energy efficiency, high energy consumption). Cutting machines used in the light industry often fail to meet the required fineness, making them defective. Therefore, the optimal type of equipment for grinding medicinal residues and distiller's grains is a disc mill that simultaneously tears and grinds fibers and proteins. Figure 2 As shown in (a), grinding mills in the food industry and disc mills for ultrafine powder of Panax notoginseng in the traditional Chinese medicine industry are all of this type of equipment. The main process parameters are set as follows: grinding concentration of 45.0%-50.0% (volume) or 10% (mass) and grinding gap of 0.25mm-0.30mm.

[0040] Example 3:

[0041] After the raw materials are ground, the selection of the filtration device is also crucial. Suitable devices for pulp-slag separation after grinding medicinal residue and distiller's grains include pressure slotted screens, disc vacuum filters, and plate and frame filter presses. The optimal device is selected based on a comprehensive comparison of cost-effectiveness and performance, according to the fineness requirements of the feed material in the subsequent catalytic oxidation process. In the pulping industry, a fineness of 10-20µm (around 600 mesh) is beneficial for balancing hydrogen production and energy consumption. Under these conditions, pressure slotted screens are unsuitable, and plate and frame filter presses have high energy consumption, high equipment prices, and complex operation; they are mainly used for filtering materials with high viscosity, easy clogging, and poor permeability. Medicinal residue, being fibrous, has excellent permeability; therefore, a cost-effective disc vacuum filter is sufficient.

[0042] Example 4:

[0043] The slurry preparation process of the above-mentioned biomass hydrogen production slurry preparation system is as follows:

[0044] Raw biomass raw materials, such as medicinal residues or distiller's grains, are collected by material transport vehicle 1 and transported to storage hopper 2 for modular processing. Then, via screw conveyor 3 and belt conveyor 4, the biomass is transported to a high-concentration grinding mill for grinding. Afterward, a high-concentration pump transports it to a disc vacuum filter or plate and frame filter press for filtration. Finally, it enters the catalytic oxidation process for subsequent electrolytic hydrogen production.

[0045] In summary, based on the principles of selecting medicinal residues and distiller's grains as raw materials, a simple application process, simplified technology, energy saving, high grinding efficiency, and low equipment costs, the above-mentioned pulp preparation method was designed. The fineness is adjusted by adjusting the grinding gap of the grinder, and the final pulp fineness is controlled by adjusting the vacuum degree of the filter and the weave density of the filter cloth.

Claims

1. A slurry preparation system for hydrogen production from biomass, characterized by, The application relates to a material storage and conveying device, which comprises a storage hopper (2) for storing raw materials, the bottom end of the storage hopper (2) being provided with a screw conveyor (3), the tail end of the screw conveyor (3) being connected with a belt conveyor (4), the other end of the belt conveyor (4) being connected with a grinding disc machine (6), the bottom outlet of the grinding disc machine (6) being communicated with a medium-concentration pump (5), the outlet of the medium-concentration pump (5) being connected with a filter (12) through a slurry conveying pipe (11), the slurry outlet of the filter (12) being connected with a catalytic oxidation process system through a slurry pipe (13) and being used for subsequent electrolytic hydrogen production, and the residue cake outlet of the filter (12) being connected with the inlet of the grinding disc machine (6) through a residue cake conveyor (9).

2. The biomass slurry preparation system for hydrogen production according to claim 1, wherein: The device further comprises a material conveying vehicle (1) for dispersing material conveying, which is used for conveying raw materials to the storage hopper (2).

3. The biomass slurry preparation system for hydrogen production according to claim 1, wherein: The belt conveyor (4) is arranged in an inclined manner, the low end of the belt conveyor (4) being connected with the outlet of the screw conveyor (3), and the high end of the belt conveyor (4) being arranged directly above the inlet of the grinding disc machine (6).

4. The biomass slurry preparation system for hydrogen production according to claim 1, wherein: The grinding disc machine (6) is a high-concentration grinding disc machine, the top end of the high-concentration grinding disc machine being provided with a grinding disc feeding hopper (8), and the bottom end of the high-concentration grinding disc machine being provided with a grinding disc discharging hopper (7).

5. The biomass slurry preparation system for hydrogen production according to claim 4, wherein: The grinding volume concentration of the grinding disc machine (6) is 45.0%-50.0%, and the grinding gap is 0.25mm-0.30mm.

6. The biomass hydrogen slurry production system of claim 1, wherein: The slurry inlet (10) of the medium-concentration pump (5) is connected with the outlet of the grinding disc machine (6), and the slurry outlet of the medium-concentration pump (5) is communicated with the slurry conveying pipe (11).

7. The biomass hydrogen slurry production system of claim 1, wherein: The filter (12) is a disc vacuum filter or a plate-and-frame filter press.

8. The biomass hydrogen production slurry preparation system of claim 7, wherein: The slurry fineness after being filtered by the filter (12) reaches 10-20mu.

9. The biomass slurry preparation system for hydrogen production according to claim 1, wherein: The raw materials are medicinal dregs or distiller's grains.

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