A system for preparing water gas from biomass

Abstract

The utility model provides a system for preparing water gas from biomass, which comprises a biomass particle module, a water-coal slurry module and a water-coal gas module which are connected in sequence; the biomass particle module comprises a dehydration and drying device, a slicer, a crusher, a mixer, a molding machine and a pelletizing and screening machine; the water-coal slurry module comprises a metering device, a crusher and a coal mill; the water-coal gas module comprises a high-pressure coal slurry pump and a gasifier; the system improves the density of biomass through the treatment of the dehydration and drying device, the mixer and the molding machine, and successfully solves the difficult problems of low biomass transportation efficiency and high cost; on the other hand, it also reduces the moisture content of the biomass mixture to below 30% and increases the calorific value of the biomass to above 3000 kcal / kg, and solves the problem of low gasification efficiency existing in the technology of preparing water gas from biomass; the utility model has the advantages of high biomass transportation efficiency, high gasification efficiency and safety.

Description

Technical Field

[0001] The utility model relates to the technical field of water gas preparation, in particular to a system for preparing water gas from biomass. Background Art

[0002] Coal-water slurry is a fuel made by mixing coal, water, etc. and undergoing physical processing. This fuel not only has low pollution and high energy efficiency, but can also be transported through pipelines. Compared with traditional coal combustion methods, coal-water slurry has shown significant environmental protection and energy-saving advantages. With the application of waste resource technology, a more environmentally friendly coal-water slurry has been developed using waste, which can improve environmental protection performance without increasing costs.

[0003] Biomass is a substance that is widely present on the earth. The annual production of major biomass resources in my country is about 3.494 billion tons. The development potential of biomass resources as energy is 460 million tons of standard coal, which can achieve carbon emission reduction of about 218 million tons. Biomass gasification is the process of using raw coal and biomass as raw materials, causing incomplete combustion and pyrolysis of raw coal and biomass under high temperature and oxygen-deficient conditions to convert them into water gas. Water gas is mainly composed of carbon monoxide and hydrogen and can be used as fuel or chemical raw material. The core equipment of biomass gasification also has the advantages of reliable operation, strong heat transfer, high gasification intensity, high gas production rate, and suitability for large and medium-sized equipment production. At present, the use of biomass gasification technology still has problems such as low biomass transportation efficiency, low gasification efficiency, easy spontaneous combustion and explosion. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a system for preparing water gas from biomass, which has the advantages of high biomass transportation efficiency, high gasification efficiency and safety; in addition, solid waste such as coal slag, dried sludge, etc. is successfully utilized.

[0005] The utility model provides a system for preparing water gas from biomass, which comprises a biomass particle module, a water-coal slurry module and a water-coal gas module connected in sequence;

[0006] The biomass particle module comprises:

[0007] Dehydration and drying equipment, used for dehydration and drying of coal slag;

[0008] a slicer, for cutting biomass into chunks;

[0009] A pulverizer, whose feeding end is connected to the discharging end of the slicer, is used to pulverize the biomass conveyed from the slicer;

[0010] A mixer, wherein a first feeding end thereof is connected to a discharging end of the dehydration and drying device, and a second feeding end thereof is connected to a discharging end of the pulverizer. The mixer is also provided with a dried sludge inlet, and the mixer is used to evenly mix the coal ash, biomass and dried sludge to form a biomass mixture;

[0011] A molding machine, whose feeding end is connected to the discharging end of the mixer, and is used to extrude the biomass mixture into biomass blocks;

[0012] A pelletizer and screener, whose feeding end is connected to the discharging end of the molding machine, and is used for cutting the biomass block into biomass particles;

[0013] The water-coal slurry module comprises:

[0014] A metering device, connected to the biomass particle module, for weighing the biomass particles and raw coal;

[0015] A crusher, whose feeding end is connected to the metering device, is used to crush the biomass particles and the raw coal delivered by the metering device;

[0016] A coal mill, the feed end of which is connected to the discharge end of the crusher, and is provided with a coal milling water inlet and an additive inlet, for preparing a water-coal slurry from the biomass particles, the raw coal, the coal milling water and the additive;

[0017] The water gas module comprises:

[0018] A high-pressure coal slurry pump, connected to the water-coal slurry module, for conveying the water-coal slurry;

[0019] The feed end of the gasifier is connected to the high-pressure coal slurry pump for reacting and producing water gas.

[0020] The system for preparing water gas from biomass provided by the utility model, by mixing biomass with coal cinders and dry sludge and processing through a mixer, a molding machine and a pelletizing and screening machine, on the one hand, improves the density of biomass and successfully solves the difficult problems of low biomass transportation efficiency and high cost; on the other hand, it also reduces the moisture content of the biomass mixture to below 30% and increases the calorific value of the biomass to above 3000kcal / kg, solving the problem of low gasification rate existing in the technology of preparing water gas from biomass; by making the biomass, raw coal and water into a liquid mixture, it successfully solves the unsafe problem caused by the high volatility, high oxygen content and low ignition point of the biomass, which leads to its easy spontaneous combustion and explosion during storage, transportation and coal grinding treatment.

[0021] In a possible implementation, the mixer is a ribbon mixer. Since the stirrer of the ribbon mixer is formed by inner and outer ribbons spiraling together, this structure can push the material to flow in the axial and radial directions, so that the coal ash, biomass and dried sludge can be mixed more evenly.

[0022] In a possible implementation, the molding machine is a screw extrusion molding machine. The screw extrusion molding machine can be used to send the coal slag, dried sludge, biomass and additives delivered by the mixer into the upper spiral auger for crushing, stirring, kneading and mixing, and then further stirred, kneaded, mixed evenly and squeezed tightly by the lower spiral auger and the spiral propeller, and finally extruded by the mold into a biomass with a certain shape and size, low water content, uniform material distribution and high physical and mechanical strength.

[0023] In a possible implementation, the crusher is a four-tooth roller crusher. The four-tooth roller crusher can crush the biomass particles and raw coal delivered by the metering device to less than 10 mm.

[0024] In a possible implementation, the coal mill is a rod mill. The biomass particles, coal grinding water and additives are ground by the rod mill to produce a water-coal slurry with a higher concentration.

[0025] In a possible implementation, the gasifier is an entrained flow gasifier. The use of an entrained flow gasifier can further improve the gasification efficiency of the water-coal slurry.

[0026] In a possible implementation, the dehydration and drying equipment is a steam dryer. The steam dryer can quickly reduce the moisture content of the coal ash to below 30% by utilizing the rapid heat conduction effect of hot steam.

[0027] In a possible implementation manner, the water gas module further includes:

[0028] a shift reaction device, connected to the gas outlet of the gasifier, for removing carbon monoxide from the water gas through a shift reaction;

[0029] A methanol purification device is connected to the gas outlet of the conversion reaction device and is used for absorbing carbon dioxide and sulfide in water gas through methanol.

[0030] In a possible implementation, the shift reaction device is an axial-radial shift furnace, which has the advantages of low shift furnace bed pressure and high catalyst utilization.

[0031] In a possible implementation, the discharge end of the gasifier is connected to the dehydration and drying equipment, and the coal slag produced by the reaction in the gasifier is transported to the dehydration and drying equipment for recycling.

[0032] The positive and progressive effects of the utility model are:

[0033] The biomass water gas preparation system provided by the utility model has the advantages of high biomass transportation efficiency, high gasification efficiency, environmental protection and safety. The biomass water gas preparation system provided by the utility model not only successfully utilizes solid waste resources, but also further improves the carbon conversion rate of raw coal by biomass, and the raw coal consumption can also be reduced by 0.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a system for preparing water gas from biomass provided by the utility model. DETAILED DESCRIPTION

[0035] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0036] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See also Figure 1 As shown, the embodiment of the present application discloses a system for preparing water gas from biomass, which is composed of a biomass particle module, a water-coal slurry module and a water-coal gas module connected in sequence;

[0040] The biomass particle module is composed of a dehydration and drying device 1, a coal slag bin 2, a conveyor belt 3, a mixer 4, a slicer 5, a crusher 6, a silo 7, a molding machine 8, and a pelletizing and screening machine 9; the water-coal slurry module is composed of a biomass bin 10, a metering belt 11, a raw coal bin 12, a crusher 13, a coal mill 14, and a large coal slurry tank; the water-coal gas module is composed of a high-pressure coal slurry pump 16, a gasification furnace 17, a shift reaction device 18, and a methanol purification device 19.

[0041] The slag produced by the gasifier 17 is dried by the dehydration and drying equipment 1 and then sent to the slag bin 2. The dried slag and the biomass-based binder are then transported to the mixer 4 through the conveyor belt 3. The waste wood is crushed into wood chips less than 5 mm by the slicer 5 and the crusher 6 and then sent to the silo 7. The waste wood is sent to the mixer 4 through the discharge port of the silo 7. The mixer 4 is a spiral ribbon mixer. The mixer 4 evenly mixes the slag, dried sludge, wood chips and biomass-based binder and then sends them to the molding machine 8. The molding machine 8 is a spiral extrusion molding machine. The molding machine 8 extrude the slag, dried sludge, wood chips and additives into strip biomass and then sends them to the downstream pelletizer 9. The strip biomass is cut into biomass particles with a diameter of 6 to 12 mm and a length of 1.5 to 2 cm. After further screening, the biomass particles are sent to the biomass bin 10. The biomass particles and the raw coal are mixed in a certain proportion through the metering belt 11 and sent to the crusher 13 for further crushing. Biomass and raw coal are sent to the downstream coal mill 14, which is a rod mill. The coal mill 14 prepares high-concentration water-coal slurry with biomass, raw coal, coal grinding water and lignin sulfonate additives, and then transports the high-concentration water-coal slurry to the large coal slurry tank 15 for storage; the high-concentration water-coal slurry in the large coal slurry tank 15 is pressurized by a high-pressure coal slurry pump 16 and then jetted from the top to the gasifier 17 in one or two ways, which is an entrained flow gasifier. The high-concentration water-coal slurry reacts in the gasifier 17 to generate water gas mainly composed of carbon monoxide and hydrogen, and then the water gas is sent to the downstream shift reaction device 18 for refining; after the water gas is subjected to three-stage conversion in the shift reaction device 18, the carbon monoxide content in the water gas is reduced to less than 0.7%, and the high-temperature water gas is sent to the downstream methanol purification device 19 after recovering heat; after the water gas is washed with methanol in the methanol purification device 19, the carbon dioxide and sulfide contents in the water gas are reduced to less than 1ppm, and a qualified water gas product can be obtained.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A system for preparing water gas from biomass, characterized in that: It includes a biomass particle module, a water-coal slurry module and a water-coal gas module which are connected in sequence; The biomass particle module comprises: Dehydration and drying equipment (1), used for dehydrating and drying coal slag; A slicer (5) for cutting the biomass into pieces; A pulverizer (6), whose feeding end is connected to the discharging end of the slicer (5), and is used to pulverize the biomass delivered from the slicer (5); A mixer (4), wherein a first feeding end thereof is connected to a discharging end of the dehydration and drying device (1), and a second feeding end thereof is connected to a discharging end of the pulverizer (6). The mixer (4) is also provided with a dried sludge inlet. The mixer (4) is used to evenly mix the coal ash, biomass and dried sludge to form a biomass mixture; A molding machine (8), whose feeding end is connected to the discharging end of the mixer (4), and is used to extrude the biomass mixture into biomass blocks; A pelletizer (9), the feed end of which is connected to the discharge end of the molding machine (8), and is used to cut the biomass block into biomass particles; The water-coal slurry module comprises: A metering device, connected to the biomass particle module, for weighing the biomass particles and raw coal; A crusher (13), whose feeding end is connected to the metering device, and is used to crush the biomass particles and the raw coal delivered by the metering device; A coal mill (14), whose feeding end is connected to the discharging end of the crusher (13), and is provided with a coal milling water inlet and an additive inlet, for preparing a water-coal slurry from the biomass particles, the raw coal, the coal milling water and the additive; The water gas module comprises: a high-pressure coal slurry pump (16), connected to the water-coal slurry module and used for conveying the water-coal slurry; The gasifier (17) has a feed end connected to the high-pressure coal slurry pump (16) for reacting to produce water gas.

2. The system for preparing water gas from biomass according to claim 1, characterized in that: The water gas module also includes: a shift reaction device (18), which is connected to the gas outlet end of the gasifier (17) and is used to remove carbon monoxide in the water gas through a shift reaction; A methanol purification device (19) is connected to the gas outlet of the shift reaction device (18) and is used to absorb carbon dioxide and sulfide in water gas through methanol.

3. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The mixer (4) is a ribbon mixer.

4. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The molding machine (8) is a screw extrusion molding machine.

5. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The crusher (13) is a four-tooth roller crusher.

6. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The coal mill (14) is a rod mill.

7. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The gasifier (17) is an entrained flow gasifier.

8. The system for preparing water gas from biomass according to claim 1 or 2, characterized in that: The dehydration and drying equipment (1) is a steam dryer.

9. The system for preparing water gas from biomass according to claim 2, characterized in that: The shift reaction device (18) is an axial-radial shift furnace.

10. The system for preparing water gas from biomass according to claim 2, characterized in that: The coal slag produced in the gasification furnace (17) is transported to the dehydration and drying equipment (1) for recycling.

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