A biomass gasification apparatus and biomass processing system

Abstract

The utility model discloses a kind of biomass gasification device and biomass processing system, it is related to biomass processing technical field, for synergic processing high moisture biomass and low moisture biomass, solve the problem of resource waste and process redundancy. The utility model provides a kind of biomass gasification device, biomass gasification device includes gasification furnace, at least four first biomass injection channels and at least four second biomass injection channels are arranged on the wall of gasification furnace along the circumferential direction, and respectively with the inside communication of gasification furnace, the extension line of the injection direction of the first biomass injection channel and the second biomass injection channel forms regular polygon.

Description

Technical Field

[0001] This utility model relates to the field of biomass processing technology, and in particular to a biomass gasification device and a biomass processing system. Background Technology

[0002] Biomass energy has a wide range of sources, mainly including agricultural and forestry waste, livestock manure, organic solid waste, and processing residues. High-efficiency biomass energy conversion technologies have become a key breakthrough for energy structure transformation and the development of a green and low-carbon economy.

[0003] In existing biomass resource utilization technologies, the treatment of low-moisture biomass such as agricultural and forestry waste (mainly including straw, rice husks, and fruit tree branches) typically employs gasification processes to produce syngas. However, the gasification process requires the addition of water vapor to promote the water-gas reaction, increasing energy consumption. For high-moisture biomass such as livestock manure (mainly including cow dung, sheep dung, and poultry manure) and organic solid waste (mainly including kitchen waste and sludge), anaerobic fermentation processes are typically used to produce biogas. However, this process has low energy conversion efficiency and a long treatment cycle. Low-moisture biomass such as straw and high-moisture biomass such as livestock manure need to be treated separately, leading to resource waste and process redundancy in the treatment of different biomass. Utility Model Content

[0004] The purpose of this invention is to provide a biomass gasification device and a biomass processing system that achieves complementary physical properties through integrated synergistic processing of low-moisture and high-moisture biomass, thereby solving the problems of resource waste and process redundancy.

[0005] In a first aspect, this utility model provides a biomass gasification device, which includes a gasifier. The gasifier wall is provided with a plurality of first biomass injection channels and a plurality of second biomass injection channels arranged in a circumferential direction and respectively communicating with the interior of the gasifier. The extension lines of the injection directions of the first biomass injection channels and the second biomass injection channels all form regular polygons.

[0006] With the above technical solution, at least four first biomass injection channels and at least four second biomass injection channels are respectively set in the circumferential direction of the gasifier wall. The first biomass injection channels are used to inject low-moisture biomass, and the second biomass injection channels are used to inject high-moisture biomass. The injection directions of both channels are at an angle to the circumferential tangent direction of the installation point of each channel on the gasifier wall and are not perpendicular to each other. That is, each channel does not inject along the radial direction of the gasifier at its respective installation position, so that low-moisture biomass and high-moisture biomass are injected into the furnace in their respective directions to form tangential swirling flow. With the design of at least four first biomass injection channels and at least four second biomass injection channels, the injected fluid achieves full coverage in the circumferential direction of the gasifier, and the extension lines of the injection directions of the first biomass injection channels and the second biomass injection channels both form regular polygons, forming different tangential swirling flow fields. Specifically, low-moisture biomass and high-moisture biomass are injected into their respective tangential swirling flow fields through the first and second biomass injection channels, respectively. Then, the high-moisture biomass mixes with the high-temperature gases released from the combustion of the low-moisture biomass. The internal moisture in the high-moisture biomass is vaporized by the heat, generating steam required for the gasification reaction of the low-moisture biomass. Simultaneously, the heat released from the combustion of the low-moisture biomass directly affects the vaporization and gasification reaction of the high-moisture biomass, eliminating the energy consumption of pre-drying the high-moisture biomass. This setup, through the physical isolation of the different injection channels to prevent material mixing, utilizes the tangential swirling flow field to achieve synergistic combustion of low-moisture and high-moisture biomass, enabling integrated processing of both without pre-drying or external steam supply. This solves the equipment redundancy problem caused by separate processing and reduces system energy consumption through the complementary self-heating and self-watering of the materials, achieving efficient resource utilization. Furthermore, the tangential swirling flow field formed by the injection enhances the turbulence intensity within the furnace, extending the material residence time by 20%-30% and improving the overall carbon conversion rate of the gasifier.

[0007] In some possible implementations, the biomass gasification device includes at least four three-channel composite nozzles arranged circumferentially on the furnace wall of the gasifier. The three-channel composite nozzles are connected to the interior of the gasifier. The extensions of the centerlines of the at least four three-channel composite nozzles form a regular polygon with a first inscribed circle of diameter D1. The three-channel composite nozzle includes a first biomass injection channel, an intermediate channel, and a second biomass injection channel arranged sequentially from the inside to the outside.

[0008] With the above technical solution, the swirling coupling design formed by the tiered injection of a three-channel composite nozzle allows for the introduction and injection of oxygen-containing gas in the middle channel. Low-moisture biomass in the first biomass injection channel and oxygen-containing gas in the middle channel converge and self-ignite at the center of the furnace. High-moisture biomass injected from the second biomass injection channel entrains high-temperature flue gas on its outer side and low-moisture biomass combustion airflow on its inner side, preventing flameout or unstable combustion caused by high-moisture airflow. Furthermore, the synchronous injection of the three-channel composite nozzle ensures uniform feeding of materials with different properties, reducing localized low-temperature zones caused by high-moisture biomass accumulation or localized high-temperature slagging zones caused by low-moisture biomass accumulation within the furnace, thereby improving the carbon conversion rate.

[0009] In some possible implementations, the biomass gasification device further includes at least four first dual-channel nozzles, which are arranged circumferentially on the furnace wall of the gasifier and communicate with the interior of the gasifier, and are located below the three-channel composite nozzle. The extension of the center lines of the at least four first dual-channel nozzles forms a regular polygon with a second inscribed circle of diameter D2. The first dual-channel nozzle includes a first inner channel and a first outer channel arranged sequentially from the inside to the outside.

[0010] With the above technical solution, by adding a first dual-channel nozzle at the bottom of the gasifier and forming a second tangential swirling flow field, the first inner channel serves as the first biomass injection channel, and the first outer channel is used to introduce and inject oxygen-containing gas. The low-moisture biomass in the first inner channel and the oxygen-containing gas in the first outer channel are injected in synergy, forming a high-temperature combustion zone at the bottom of the furnace, providing a stable heat source for the upper gasification reaction.

[0011] In some possible implementations, the biomass gasification unit further includes at least four single-channel nozzles. These nozzles are arranged circumferentially on the furnace wall and communicate with the interior of the gasifier. The single-channel nozzles are positioned above the three-channel composite nozzles, and the extensions of the centerlines of the at least four single-channel nozzles form a regular polygon with a third inscribed circle of diameter D3. This configuration, by adding single-channel nozzles above the three-channel composite nozzles and forming a third tangential swirling flow field, allows the single-channel nozzles to inject oxygen-containing gas. The oxygen-containing gas injected by the single-channel nozzles creates a high-speed oxygen-containing zone at the top of the furnace, convection with the rising syngas, promoting the cracking of unburned carbon particles and tar, thereby improving the quality of gasification products and carbon conversion efficiency.

[0012] In some possible implementations, the diameters of the second, first, and third inscribed circles are related as follows: D2 > D1 > D3. By setting up tangential swirling fields with different diameters, ensuring D2 > D1 > D3, the lower large-diameter swirling field covers the bottom of the furnace, enhancing the combustion reaction of large particles sliding down the furnace wall, improving carbon conversion, and compensating for the temperature drop caused by the high-moisture biomass endothermic reaction in the middle layer three-channel composite nozzle. The lower layer ensures carbon conversion, the middle layer maintains reaction equilibrium, and the upper single-channel nozzle's small-diameter swirling field gathers high-temperature oxygen at the center of the furnace, causing tar and fine particles in the rising syngas to be centripetally collected and cracked. Through this design, the temperature drop caused by the direct gasification of high-moisture biomass is eliminated, and efficient reaction is maintained through particle recirculation and tar cracking, reducing the residue of tar and other impurities and improving the quality of the syngas.

[0013] In some possible implementations, the inner diameter of the gasifier is D4, and the ratio of D4 to D2 is 1.25-1.7;

[0014] And / or, the ratio of D4 to D1 is 1.7-3;

[0015] And / or, the ratio of D4 to D3 is 3-5.

[0016] By adopting the above technical solution and setting the above diameter ratio range, the flow field space ratio is optimized. The large space in the lower layer ensures heat release, the moderate space in the middle layer maintains reaction equilibrium, and the small space in the upper layer achieves precise impurity removal. This avoids uneven material distribution and energy dissipation in the flow field and ensures the stable and efficient operation of the device.

[0017] In some possible implementations, the biomass gasification device includes at least four second dual-channel nozzles and at least four third dual-channel nozzles;

[0018] The second dual-channel nozzles are arranged along the circumference of the gasifier on the furnace wall. The second dual-channel nozzles are in communication with the interior of the gasifier. The extensions of the center lines of the at least four second dual-channel nozzles form a regular polygon with a fourth inscribed circle of diameter D5. The second dual-channel nozzles include a second biomass injection channel and a second outer channel arranged sequentially from the inside to the outside.

[0019] The third dual-channel nozzles are arranged along the circumference of the gasifier on the furnace wall. The third dual-channel nozzles are connected to the interior of the gasifier. The extensions of the center lines of the at least four third dual-channel nozzles form a regular polygon with a fifth inscribed circle of diameter D6.

[0020] The third dual-channel nozzle comprises a first biomass injection channel and a third outer channel that are sequentially sleeved from inside to outside; wherein the second dual-channel nozzle is located above the third dual-channel nozzle.

[0021] With the adoption of the above technical solution, at least four second dual-channel nozzles and at least four third dual-channel nozzles are arranged on the furnace wall of the gasifier; the second dual-channel nozzle is sequentially sleeved with a second biomass injection channel and a second outer channel from inside to outside, the second biomass injection channel is communicated with a high-moisture biomass inlet, and the second outer channel is communicated with an oxygen-containing gas inlet; the third dual-channel nozzle is sequentially sleeved with a first biomass injection channel and a third outer channel from inside to outside, the first biomass injection channel is communicated with a low-moisture biomass inlet, and the third outer channel is communicated with an oxygen-containing gas inlet. The lower third dual-channel nozzles in the gasifier and the additionally arranged upper second dual-channel nozzles form a vertical system. In specific implementation, the first biomass injection channel of the third dual-channel nozzle injects low-moisture biomass into the lower part of the furnace chamber, and the low-moisture biomass fully burns in the lower part of the furnace chamber to release heat; meanwhile, the second dual-channel nozzle injects high-moisture biomass into the upper part of the furnace chamber through the second biomass injection channel thereof, the ascending hot airflow generated by the combustion of low-moisture biomass in the lower part and the saturated steam generated by the evaporation of high-moisture biomass in the upper part meet in the middle of the furnace chamber, the saturated steam participates in the gasification reaction of low-moisture biomass, and meanwhile the heat from the combustion of low-moisture biomass continuously compensates for the heat absorbed by the evaporation of high-moisture biomass, so as to ensure the continuous circulation of the reaction.

[0022] In some possible implementation manners, the diameter relationship between the fourth inscribed circle and the fifth inscribed circle satisfies: D5<D6.

[0023] With the adoption of the above technical solution, since D5<D6, high-moisture biomass is restricted to evaporate and vaporize in a low-temperature region far away from the furnace wall, the ascending hot airflow generated by combustion in the lower large swirling flow field and the saturated steam generated by evaporation of high-moisture biomass in the upper layer meet in the middle of the furnace chamber, the saturated steam participates in the gasification reaction of low-moisture biomass, and meanwhile the heat from combustion of low-moisture biomass continuously compensates for the heat absorbed by evaporation of high-moisture biomass. High-moisture biomass evaporates and gasifies in a low-temperature region far away from the furnace wall, so that high-moisture biomass avoids the high-temperature furnace wall, which solves the coking problem of low ash melting point materials. Meanwhile, high-moisture biomass and low-moisture biomass are injected into the gasifier through different injection channels, which avoids material mixing, and realizes the cooperative combustion of low-moisture biomass and high-moisture biomass by virtue of the tangential circle swirling flow field, so that low-moisture biomass and high-moisture biomass complete integrated treatment under the conditions of no pre-drying and no external steam supply.

[0024] In a second aspect, the present utility model further provides a biomass processing system, comprising the biomass gasification device according to any one of the above items. Compared with the prior art, the beneficial effects of the biomass processing system are the same as those of the above biomass gasification device, and thus will not be repeated herein.

[0025] In some possible implementations, the biomass processing system also includes:

[0026] A low-moisture biomass pretreatment device, wherein the output end of the low-moisture biomass pretreatment device is connected to the first biomass injection channel; and / or,

[0027] A high-moisture biomass pretreatment device, wherein the output end of the high-moisture biomass pretreatment device is connected to the second biomass injection channel.

[0028] Using the above technical solution, by setting up low-moisture biomass pretreatment devices and high-moisture biomass pretreatment devices, low-moisture biomass is transformed into dry powder through crushing, briquetting, baking, and grinding, increasing its calorific value and ensuring the stability of pneumatic conveying; high-moisture biomass is crushed, impurity removed, and modulated to form a uniform slurry, optimizing its flowability. The pretreatment devices are customized to address the differences in the physical properties of different biomass. Low-moisture biomass is baked and dehydrated, while high-moisture biomass is modulated to avoid direct spraying and nozzle clogging. The pretreated materials are precisely matched with independent channels. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0030] Figure 1 A schematic diagram of the overall structure of a biomass treatment system provided in an embodiment of this utility model;

[0031] Figure 2 A schematic diagram of the structure of a three-channel composite nozzle of a biomass gasification device provided in this embodiment of the present invention;

[0032] Figure 3 A cross-sectional schematic diagram of a three-channel composite nozzle of a biomass gasification device provided for an embodiment of this utility model;

[0033] Figure 4 A schematic diagram of the structure of the first dual-channel nozzle of a biomass gasification device provided in an embodiment of this utility model;

[0034] Figure 5 A schematic diagram of a cross-section of a biomass gasification device including a three-channel composite nozzle, provided for an embodiment of this utility model;

[0035] Figure 6 A schematic cross-sectional view of a biomass gasification device including a first dual-channel nozzle, provided for an embodiment of this utility model;

[0036] Figure 7 A schematic cross-sectional view of a gasifier including a single-channel nozzle in a biomass gasification device provided for an embodiment of this utility model;

[0037] Figure 8 A schematic cross-sectional view of a gasifier including a second dual-channel nozzle and a third dual-channel nozzle, provided for an embodiment of this utility model.

[0038] Reference numerals in the attached figures: 1 is a gasifier, 110 is a single-channel nozzle, 120 is a first dual-channel nozzle, 1201 is a first inner channel, 1202 is a first outer channel, 130 is a three-channel composite nozzle, 1301 is a first biomass injection channel, 1302 is a middle channel, 1303 is a second biomass injection channel, 140 is a swirl blade, 2 is a waste heat boiler, 3 is a heat exchanger, 4 is a syngas outlet, 5 is a slag discharge port, 150 is a second dual-channel nozzle, and 160 is a third dual-channel nozzle. Detailed Implementation

[0039] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0042] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] like Figure 1 As shown, this utility model embodiment provides a biomass gasification device, which includes a gasifier 1. The gasifier 1 includes a furnace body, which may be cylindrical. A syngas outlet 4 is provided at the top of the furnace body, and a slag discharge port 5 is provided at the center of the bottom of the furnace body. At least four first biomass injection channels and at least four second biomass injection channels are arranged circumferentially and communicate with the interior of the gasifier 1. The first biomass injection channels are used to introduce and inject low-moisture biomass, which can be agricultural and forestry waste, such as straw, rice husks, fruit tree branches, etc. The first biomass injection channel can be processing residue biomass, such as sawdust, with a moisture content generally between 0-40% (test standard GB / T28733-2012); the second biomass injection channel is used to introduce and spray high-moisture biomass, which can be livestock manure biomass (such as cow manure, sheep manure, poultry manure) or organic solid waste biomass, such as kitchen waste, sludge, etc., with a moisture content generally between 60-90% (test standard GB / T28733-2012); the extension lines of the injection directions of the first and second biomass injection channels both form regular polygons.

[0045] With the above technical solution, at least four first biomass injection channels and at least four second biomass injection channels are respectively arranged circumferentially on the gasifier wall 1. The injection direction of the first biomass injection channel is at an angle to the circumferential tangent direction of the first biomass injection channel at its installation position on the gasifier wall 1 and is not perpendicular to each other. Similarly, the injection direction of the second biomass injection channel is at an angle to the circumferential tangent direction of the second biomass injection channel at its installation position on the gasifier wall 1 and is not perpendicular to each other. That is, the injection directions of the first and second biomass injection channels are at an angle to the radial direction passing through the first and second biomass injection channels at their installation positions on the gasifier wall 1. Each channel does not inject along the radial direction of the gasifier at its respective installation position, so that low-moisture biomass and high-moisture biomass are injected into the furnace in a predetermined direction, forming a tangential vortex. The design employs at least four first biomass injection channels and at least four second biomass injection channels, achieving full circumferential coverage of the injection fluid in the gasifier 1. The extensions of the injection directions of both the first and second biomass injection channels form regular polygons, creating a tangential swirling flow field. Specifically, low-moisture biomass and high-moisture biomass are injected into their respective tangential swirling flow fields. Subsequently, the high-moisture biomass mixes with the high-temperature gas released from the combustion of the low-moisture biomass, causing the internal moisture to vaporize and generate steam required for the gasification reaction of the low-moisture biomass. Simultaneously, the heat released from the combustion of the low-moisture biomass directly affects the vaporization and gasification reaction of the high-moisture biomass, eliminating the energy consumption associated with the pre-drying of the high-moisture biomass. This setup avoids material mixing through physical isolation of different injection channels, enhances turbulence intensity within the furnace by utilizing a tangential swirling flow field, extends material residence time by 20%-30%, improves the overall carbon conversion rate of the gasifier, and enables the synergistic combustion of low-moisture and high-moisture biomass. This allows for integrated processing of low-moisture and high-moisture biomass without pre-drying or external steam supply, solving the equipment redundancy problem caused by separate processing and reducing system energy consumption through the complementary self-heating and self-watering of materials, thus achieving efficient resource utilization.

[0046] like Figure 5As shown, in some embodiments, the biomass gasification device includes at least four three-channel composite nozzles 130 arranged circumferentially on the furnace wall of the gasifier 1. The number of three-channel composite nozzles 130 can be four, five, six, or more. When there are four three-channel composite nozzles 130, they are arranged circumferentially along the gasifier 1, and the extensions of their center lines form a regular quadrilateral. Similarly, when there are five three-channel composite nozzles 130, the extensions of their center lines form a regular pentagon. When there are six three-channel composite nozzles 130, the extensions of their center lines form a regular hexagon. When there are more than one three-channel composite nozzle 130, the arrangement of four, five, and six three-channel composite nozzles 130 can be referenced above. At least four three-channel composite nozzles 130 are evenly distributed circumferentially on the same horizontal cross-section of the furnace wall. The three-channel composite nozzle 130 is internally connected to the gasifier 1. The injection direction of the three-channel composite nozzle 130 has a first angle with the radial direction of the gasifier 1. The extension lines of the center lines of at least four three-channel composite nozzles 130 form a regular polygon with a first inscribed circle of diameter D1. The three-channel composite nozzle 130 includes a first biomass injection channel 1301, a middle channel 1302 and a second biomass injection channel 1303 arranged sequentially from the inside to the outside. The first biomass injection channel 1301 is used to introduce and inject low-moisture biomass, the second biomass injection channel 1303 is used to introduce and inject high-moisture biomass, and the middle channel 1302 is used to introduce and inject oxygen-containing gas, which can be pure oxygen or air.

[0047] For example, when there are four three-channel composite nozzles 130, the four three-channel composite nozzles 130 are evenly distributed along the circumference of the gasifier wall 1, and the included angle between adjacent three-channel composite nozzles 130 is 90°. The included angle between the injection direction of each three-channel composite nozzle 130 and the radial direction of the gasifier 1 can be any value between 35° and 45°, such as 35°, 40°, 45°, etc., and the tangential direction of all three-channel composite nozzles 130 is either clockwise or counterclockwise to form a tangential swirling flow field; when there are five three-channel composite nozzles 130, the five three-channel composite nozzles 130 are evenly distributed along the circumference of the gasifier wall 1, and the included angle between adjacent three-channel composite nozzles 130 is 90°. The channel composite nozzles 130 are evenly distributed along the circumference of the gasifier wall 1. The included angle between adjacent three-channel composite nozzles 130 is 72°. The included angle between the injection direction of each three-channel composite nozzle 130 and the radial direction of the gasifier 1 can be any value between 30° and 40°, such as 30°, 35°, 40°, etc. The tangential direction of all three-channel composite nozzles 130 is either clockwise or counterclockwise to form a tangential swirling flow field. When there are more three-channel composite nozzles 130, their arrangement can be the same as that of four or five three-channel composite nozzles 130.

[0048] For example, such as Figure 2 As shown, the three-channel composite nozzle 130 includes an outer tube, a middle tube, and an inner tube coaxially sleeved together, forming a second biomass injection channel 1303, a middle channel 1302, and a first biomass injection channel 1301 from the outside to the inside. The side wall of the second biomass injection channel 1303 is provided with a high-moisture biomass inlet for introducing high-moisture biomass. One end of the middle channel 1302 is provided with an oxygen-containing gas inlet, and the other end is provided with an oxygen-containing gas outlet connected to the gasifier 1. The first biomass injection channel 1301 is a straight-through tubular structure with a low-moisture biomass inlet on its side wall. One end of the first biomass injection channel 1301 is connected to the gasifier 1 for introducing low-moisture biomass into the gasifier 1.

[0049] With the above technical solution, the three-channel composite nozzle 130 is evenly distributed along the circumference of the furnace wall. The first biomass injection channel 1301 tangentially injects low-moisture biomass into the central area of ​​the furnace to form a high-temperature combustion zone. The middle channel 1302 uses oxygen to aid combustion and enhance heat release. The second biomass injection channel 1303 sprays out high-moisture biomass, and its outer side entrains high-temperature flue gas, while its inner side entrains the flame gas flow provided by the high-temperature combustion zone formed by the low-moisture biomass. Moisture is vaporized into steam and participates in the gasification reaction. The fractional injection structure makes the physical properties of heating from low-moisture biomass and water supply from high-moisture biomass complementary. The swirling flow field forcibly mixes the moisture in the outer slurry, which is directly converted into reaction steam at high temperature, eliminating the need for external steam supply equipment. This improves the water utilization rate and carbon conversion efficiency of high-moisture biomass, achieving integrated and stable gasification without drying or external steam supply.

[0050] like Figure 1 , Figure 4 or Figure 6 As shown, in some embodiments, the biomass gasification device further includes at least four first dual-channel nozzles 120. The at least four first dual-channel nozzles 120 are arranged circumferentially on the furnace wall of the gasifier 1 and communicate with the interior of the gasifier 1. The first dual-channel nozzles 120 are located below the three-channel composite nozzle 130. The extension lines of the center lines of the at least four first dual-channel nozzles 120 form a regular polygon with a second inscribed circle of diameter D2. The first dual-channel nozzle 120 includes a first inner channel 1201 and a first outer channel 1202 sequentially arranged from the inside to the outside. The first inner channel 1201 serves as a first biomass injection channel for introducing and injecting low-moisture biomass, and the first outer channel 1202 serves as an oxygen-containing gas injection channel.

[0051] For example, the number of first dual-channel nozzles 120 can be four, five, or more, and the multiple first dual-channel nozzles 120 are evenly distributed along the circumferential direction on the same horizontal cross-section of the furnace wall. Specifically, the specific arrangement of the multiple first dual-channel nozzles 120 on the furnace wall of the gasifier 1 can refer to the arrangement of the three-channel composite nozzle 130. Figure 4 As shown, the first dual-channel nozzle 120 includes an outer tube and an inner tube coaxially sleeved together, forming two independent channels. The outer tube has an oxygen-containing gas inlet on its sidewall for introducing pure oxygen or oxygen-enriched flow; the inner tube has a low-moisture biomass inlet on its sidewall for introducing low-moisture biomass, such as roasted straw powder. The outlet end of the outer tube extends beyond the outlet end of the inner tube, forming an advanced oxygen-containing gas injection structure. The protruding design of the outer tube ensures that the oxygen-containing gas preferentially enters the high-temperature reaction zone, ensuring continuous and sufficient oxygen during combustion.

[0052] With the above technical solution, a first dual-channel nozzle 120 is added to the lower part of the three-channel composite nozzle 130 in the gasifier 1. The first dual-channel nozzle 120 includes a first inner channel 1201 and a first outer channel 1202 arranged sequentially from the inside to the outside. The first inner channel 1201 tangentially injects low-moisture biomass to the bottom of the furnace to form a basic combustion zone. At the same time, the oxygen-containing gas in the first outer channel 1202 mixes with the low-moisture biomass to enhance the combustion intensity. The second tangential swirling flow field formed by it releases heat through the combustion of low-moisture biomass and radiates heat upward as a heat source to provide heat compensation for the vaporization and gasification reaction of high-moisture biomass at the upper three-channel composite nozzle 130. This ensures that when the high-moisture biomass in the upper layer evaporates and absorbs heat, the combustion heat in the lower layer is neutralized and the temperature drop is reduced in real time, preventing the gasification reaction from being interrupted due to the drop in furnace temperature.

[0053] In some embodiments, such as Figures 2-4 As shown, a swirl vane 140 is provided in the second biomass injection channel 1303; and / or, a swirl vane 140 is provided in the first outer channel 1202.

[0054] For example, the swirl blade 140 is a fixed circumferentially distributed inclined guide plate structure, integrally formed on the inner wall of the channel by welding or casting; the swirl blade 140 extends along the channel axis and is arranged near the outlet end of the channel. The swirl blade 140 structure can be set in the second biomass injection channel 1303 to enhance the swirl of high-moisture biomass and the entrainment of high-temperature flue gas, and can also be arranged in the first outer channel 1202 to enhance the oxygen swirl intensity to achieve staged combustion.

[0055] In the biomass gasification device, a swirl vane 140 is provided in the second biomass injection channel 1303 of the three-channel composite nozzle 130 and / or the first outer channel 1202 of the first dual-channel nozzle 120. The swirl vane 140 is fixed to the inner wall surface along the circumference of the second biomass injection channel 1303 and / or the first outer channel 1202. The swirl vane 140 can be positioned only in the second biomass injection channel 1303, only in the first outer channel 1202, or simultaneously in both the second biomass injection channel 1303 and the first outer channel 1202. With this configuration, the swirl vane 140 is embedded inside the three-channel composite nozzle 130 or the first dual-channel nozzle 120. When the swirl vane 140 is configured in the second biomass injection channel 1303, high-moisture biomass passes through the swirl vane 140 to form a swirling jet; when the swirl vane 140 is configured in the first outer channel 1202, the oxygen-containing gas introduced into the first outer channel 1202 passes through it to form turbulent diffusion, which enhances the mixing effect of oxygen and low-moisture biomass, making the combustion more complete and the flame more stable. The oxygen-containing gas in the first outer channel 1202 forms a turbulent diffusion flow to enhance the mixing uniformity with low-moisture biomass and enhance the reaction rate of low-moisture biomass combustion.

[0056] In some embodiments, such as Figure 1 As shown, the biomass gasification device also includes at least four single-channel nozzles 110. The at least four single-channel nozzles 110 are arranged in a circumferential direction on the furnace wall of the gasifier 1 and are connected to the interior of the gasifier 1. The single-channel nozzles 110 are located above the three-channel composite nozzles 130. The extension lines of the center lines of the at least four single-channel nozzles 110 form a regular polygon with a third inscribed circle of diameter D3. The single-channel nozzles 110 are used to introduce and spray oxygen-containing gas.

[0057] The number of single-channel nozzles 110 can be four, five or more, and the multiple single-channel nozzles 110 are evenly distributed along the circumference on the same horizontal section of the furnace wall. The specific arrangement of the multiple single-channel nozzles 110 can refer to the arrangement of the three-channel composite nozzle 130 and the first dual-channel nozzle 120.

[0058] For example, such as Figure 7 As shown, the single-channel nozzle 110 has a straight-through circular tube structure with an oxygen-containing gas inlet on its side wall and a converging nozzle formed by the narrowing of the outlet end, which sprays pure oxygen at a speed of 60m / s-80m / s. This structure has no layered channel design, and the converging structure at the outlet avoids the attenuation of the temperature field caused by airflow diffusion.

[0059] With the above technical solution, the oxygen-containing gas injected at high speed by the single-channel nozzle 110 forms a centripetal swirling flow field at the top of the furnace. Unburned tar and carbon particles in the rising syngas converge towards the high-temperature central region under the swirling action of the swirling flow field, forming a high-temperature pyrolysis zone. This causes tar molecules to be broken down into small-molecule combustible gases, reducing the content of impurities such as tar. At the same time, the carbon particles undergo secondary reactions, improving the utilization efficiency of carbon particles. Furthermore, the presence of the swirling flow field prolongs the gas phase residence time, further ensuring the fullness of the reaction.

[0060] In some embodiments, the diameters of the second inscribed circle, the first inscribed circle, and the third inscribed circle are related by the following condition: D2>D1>D3. The gasification device is designed with three layers of swirling flow fields with different diameters. The lower layer first dual-channel nozzle 120 forms a large-diameter tangential swirling flow field, the middle layer three-channel composite nozzle 130 forms a medium-diameter tangential swirling flow field, and the upper layer single-channel nozzle 110 forms a small-diameter tangential swirling flow field. The design incorporates several key elements: a lower-level large-diameter tangential swirling flow field covering a significant portion of the furnace bottom; a middle-level gasification zone where large carbon particles settle on the furnace wall under centrifugal force, allowing them to mix and react thoroughly with the high-temperature flue gas during settling, thus improving carbon conversion; a middle-level medium-diameter swirling flow field maintaining the reaction of high-moisture biomass, which, upon injection, is reduced in volume and dispersed into fine particles by swirling shear, reacting in the center of the furnace to generate steam, forming a self-circulating steam supply system; and an upper-level small-diameter swirling flow field, where high-purity oxygen creates a localized high-temperature zone for tar cracking and further reaction of fine particles, further enhancing carbon conversion. This design achieves particle-stage reaction and flow field control.

[0061] In some embodiments, the inner diameter of the gasifier 1 is D4, and the ratio of D4 to D2 is 1.25-1.7; and / or, the ratio of D4 to D1 is 1.7-3; and / or, the ratio of D4 to D3 is 3-5. The ratio of D4 to D2 can be set to 1.25-1.7 alone, or the ratio of D4 to D1 can be set to 1.7-3 alone, or the ratio of D4 to D3 can be set to 3-5 alone; or, the relationships between the diameters of the first, second, and third inscribed circles and the inner diameter D4 of the gasifier 1 can be satisfied simultaneously; or only two of these relationships can be satisfied.

[0062] For example, the ratio of the inner diameter D4 of the gasifier 1 to the diameter of the first tangential swirling flow field D1 is 1.7-3. Specifically, the diameter ratio can be 1.7, 2, 2.5, 3, etc. If D4 / D1 is less than 1.7, the diffusion of the first tangential swirling flow field in the middle layer is excessive, and the water vapor formed by the evaporation of high-moisture biomass is too scattered, which cannot build a good gasification environment, resulting in a low reaction rate. If D4 / D1 is greater than 3, the space of the middle swirling flow field is too small, and the high-moisture biomass jet collides with the furnace wall before it is fully atomized, resulting in an incomplete reaction. Therefore, considering the reaction rate and the sufficiency of the reaction, the diameter ratio of D4 / D1 is selected to be between 1.7 and 3. The ratio of the inner diameter D4 of the gasifier 1 to the inner diameter D2 of the second tangential swirling flow field is 1.25-1.7. Specifically, the diameter ratio can be 1.25, 1.35, 1.45, 1.55, 1.65, 1.7, etc. If D4 / D2 is less than 1.25, the diameter of the lower tangential swirling flow will be too large, and the settled particles will accumulate on the furnace wall, which is not conducive to the full reaction of the material. If D4 / D2 is greater than 1.7, the diameter of the lower second tangential swirling flow will be too small, and the insufficient swirling flow coverage will prevent the particles from fully entering the swirling flow for reaction, resulting in a decrease in carbon conversion rate. Therefore, the diameter ratio of D4 / D2 is selected to be between 1.25 and 1.7. The ratio of the inner diameter D4 of the gasifier 1 to the diameter of the third tangential swirling flow field D3 is 3-5. Specifically, the diameter ratio can be 3, 3.5, 4, 4.5, 5, etc. If the diameter ratio is less than 3, the diameter of the third tangential swirling flow field is too large, its centripetal convergence force is weakened, and it cannot effectively capture tar and small particles, resulting in a reduction in its ability to purify and improve carbon conversion rate through secondary reaction. If the diameter ratio is greater than 5, the diameter of the third tangential swirling flow field is too small, resulting in insufficient space for tar cracking, shortened pollutant residence time, reduced cracking rate, and insufficient purification capacity. Therefore, considering the purification capacity of the third tangential swirling flow field and the ability of secondary reaction to improve carbon conversion rate, the diameter ratio is selected as 3-5.

[0063] like Figure 8As shown, in other embodiments, another biomass gasification device for achieving synergistic reaction of high-moisture and low-moisture biomass is provided. The biomass gasification device includes at least four second dual-channel nozzles 150 and at least four third dual-channel nozzles 160. The second dual-channel nozzles 150 are arranged along the circumference of the gasifier on the furnace wall, communicating with the interior of the gasifier. The extensions of the centerlines of the at least four second dual-channel nozzles 150 form a regular polygon with a fourth inscribed circle of diameter D5. Each second dual-channel nozzle 150 includes a second biomass injection channel and a second outer channel sequentially arranged from the inside out. The second outer channel is used to introduce and spray oxygen-containing gas; the third dual-channel nozzle 160 is arranged on the furnace wall of the gasifier along the circumference of the gasifier. The third dual-channel nozzle 160 is connected to the interior of the gasifier. The extension lines of the center lines of at least four third dual-channel nozzles 160 form a regular polygon. The regular polygon has a fifth inscribed circle with a diameter of D6. The third dual-channel nozzle 160 includes a first biomass injection channel and a third outer channel arranged sequentially from the inside to the outside. The first biomass injection channel is used to introduce and spray low-moisture biomass, and the third outer channel is used to introduce and spray oxygen-containing gas. The second dual-channel nozzle 150 is located above the third dual-channel nozzle 160.

[0064] With the above technical solution, the lower third dual-channel nozzle 160 in the gasifier 1 and the upper second dual-channel nozzle 150 form a vertical system. Specifically, the first biomass injection channel of the third dual-channel nozzle 160 injects low-moisture biomass into the lower part of the furnace, where it is fully combusted and releases heat. Simultaneously, the second dual-channel nozzle 150 injects high-moisture biomass into the upper part of the furnace through its second biomass injection channel. The rising hot airflow generated by the combustion of the lower low-moisture biomass and the saturated steam generated by the evaporation of the upper high-moisture biomass converge in the middle of the furnace. The saturated steam participates in the gasification reaction of the low-moisture biomass, and the heat from the combustion of the low-moisture biomass continuously compensates for the heat absorbed by the evaporation of the high-moisture biomass, ensuring the continuous cycle of the reaction. It should be noted that the arrangement of the second dual-channel nozzle 150 and the third dual-channel nozzle 160 on the furnace wall of the gasifier 1 can refer to the three-channel composite nozzle 130 described above.

[0065] For example, the structures of the second dual-channel nozzle 150 and the third dual-channel nozzle 160 are the same as those of the first dual-channel nozzle 120, such as... Figure 4 As shown, each includes an outer tube and an inner tube that are coaxially fitted together, forming two independent channels.

[0066] It should be noted that at least four second dual-channel nozzles 150 and at least four third dual-channel nozzles 160 may all be arranged on the same horizontal plane; or the second dual-channel nozzles 150 are arranged on the same horizontal plane, and the third dual-channel nozzles 160 are arranged on another horizontal plane.

[0067] Further, the relationship between the diameter of the fourth inscribed circle formed by the second dual-channel nozzles 150 and the diameter of the fifth inscribed circle formed by the third dual-channel nozzles 160 satisfies: D5 < D6.

[0068] With the adoption of the above technical solution, the lower third dual-channel nozzles 160 in the gasifier 1 and the additionally arranged second dual-channel nozzles 150 on the upper layer thereof form a vertical system. In specific implementation, the first biomass injection channel of the third dual-channel nozzle 160 injects low-moisture biomass into the lower part of the furnace chamber, and the third outer channel injects oxygen-containing gas flow to form a large-diameter swirling flow field, which drives the low-moisture biomass to fully burn in the high-temperature zone to release heat; meanwhile, the second dual-channel nozzle 150 injects high-moisture biomass into the upper part of the furnace chamber through the second biomass injection channel thereof, and the second outer channel injects oxygen-containing gas flow to wrap the slurry to form a small-diameter swirling flow field. Since D5 < D6, the high-moisture biomass is confined in the low-temperature zone away from the furnace wall for evaporation and vaporization, the ascending hot gas flow generated by the combustion of the large swirling flow field in the lower layer intersects with the saturated steam generated by the evaporation of the high-moisture biomass in the upper layer in the middle of the furnace chamber, the saturated steam participates in the gasification reaction of the low-moisture biomass, and meanwhile the heat from the combustion of the low-moisture biomass continuously compensates for the heat absorbed by the evaporation of the high-moisture biomass, so as to ensure the continuous circulation of the reaction.

[0069] Based on the biomass gasification device described in any one of the above embodiments, as Figure 1 shown, an embodiment of the present utility model further provides a biomass processing system, including the biomass gasification device described in any one of the above embodiments and a post-processing device. With the adoption of the above technical solution, the biomass processing system has the same beneficial effects as the above biomass gasification device, which are not repeated herein.

[0070] In some embodiments, the biomass treatment system further includes a post-treatment device. The biomass treatment system is constructed by integrating the biomass gasification device with the post-treatment device. The biomass gasification device processes high- and low-moisture biomass through a differentiated and synergistic mechanism: its first biomass injection channel introduces calorific value carriers such as roasted and pulverized straw, while its second biomass injection channel introduces high-moisture slurry such as poultry and livestock manure. The two materials complement each other in a graded tangential flow field. The high-moisture slurry evaporates to provide the steam source required for the gasification reaction, while the low-moisture powder burns to release heat, compensating for the temperature drop caused by slurry evaporation, generating syngas which is then transported to the post-treatment device. The post-treatment device purifies the syngas obtained from the biomass gasification device, eliminating the redundant energy consumption problems of raw material pre-drying and external steam supply in traditional processes. This solves the problems of low energy efficiency and frequent equipment maintenance when high-moisture biomass is gasified alone, thereby improving the biomass energy conversion efficiency.

[0071] In some embodiments, such as Figure 1 As shown, the post-processing device includes a waste heat boiler 2 and a heat exchanger 3; wherein, the waste heat boiler 2 is connected to the syngas output end of the biomass gasification device, and the waste heat boiler 2 is used to recover the waste heat of the syngas and generate saturated steam; the heat exchanger 3 is connected to the output end of the waste heat boiler 2, and the heat exchanger 3 is used to exchange heat between the syngas and the high-moisture biomass.

[0072] During operation, the high-temperature syngas, at 800℃-1000℃, first enters the waste heat boiler 2 to recover heat, cooling it to 300℃-400℃ and producing saturated steam. The waste heat from the syngas is then further cooled to below 200℃ by exchanging heat with high-moisture biomass slurry such as manure, before entering subsequent treatment processes. The waste heat from the syngas preheats the high-moisture biomass slurry, reducing energy consumption for water evaporation during gasification. The post-treatment unit utilizes a coordinated design of the waste heat boiler 2 and heat exchanger 3. The waste heat boiler 2 is connected to the syngas outlet of the biomass gasification unit, converting the waste heat of the high-temperature syngas into saturated steam, which is directly supplied to the gasification system, reducing external energy input requirements. The heat exchanger 3 is connected downstream of the waste heat boiler 2, exchanging heat between the initially cooled syngas and the high-moisture biomass. The high-moisture biomass absorbs the waste heat from the syngas for preheating and dehydration, reducing the energy burden of water evaporation during the gasification stage. This eliminates the waste heat and redundant energy consumption of high-moisture biomass pretreatment in traditional processes, improving energy utilization efficiency.

[0073] In some embodiments, the post-treatment device further includes a purifier connected to the output end of the heat exchanger 3, which is used to perform dust removal, water washing and desulfurization treatment on the syngas.

[0074] For example, the purifier is a three-stage integrated purification unit. The first stage can be a multi-tube cyclone separator, which removes unburned carbon particles and fly ash from the syngas through centrifugal force, achieving the effect of removing particles larger than 10μm. The second stage can be a Venturi scrubbing tower, which captures and dissolves tar components through a high-speed atomized water curtain, while simultaneously absorbing other soluble gaseous impurities, resulting in a tar content of less than 0.1g / Nm3. The third stage is a desulfurization tower, which uses a solution that can react with hydrogen sulfide or other sulfides to absorb sulfur byproducts in the syngas, achieving a desulfurization effect with a hydrogen sulfide content of less than 20ppm, ultimately obtaining high-quality syngas that can be directly used for methanol synthesis or power generation.

[0075] With this setup, a purifier is added to the post-treatment unit. Connected in series downstream of heat exchanger 3, the purifier further treats the syngas after waste heat recovery and slurry preheating. Dust removal removes unburned particles and fly ash, water washing dissolves acidic gases and residual tar, and desulfurization reduces the content of pollutants such as sulfides. The purifier solves the problems of high impurities and high purification costs in traditional gasification processes.

[0076] In some embodiments, the biomass processing system further includes a low-moisture biomass pretreatment device and / or a high-moisture biomass pretreatment device. That is, the biomass processing system may include only a low-moisture biomass pretreatment device, or only a high-moisture biomass pretreatment device, or both. The output of the low-moisture biomass pretreatment device is connected to a first biomass injection channel, used to crush, briquette, bake, and grind the low-moisture biomass to obtain low-moisture biomass, which is then fed into the first biomass injection channel. The output of the high-moisture biomass pretreatment device is connected to a second biomass injection channel, used to crush, remove impurities, and modulate the high-moisture biomass to obtain high-moisture biomass, which is then fed into the second biomass injection channel.

[0077] With the above technical solution, by setting up a low-moisture biomass pretreatment device and a high-moisture biomass pretreatment device, low-moisture biomass, such as straw biomass, is converted into dry powder through crushing, briquetting, baking and grinding, which increases the calorific value and ensures the stability of pneumatic conveying; high-moisture biomass, such as poultry and livestock manure biomass, is formed into a uniform slurry through crushing, impurity removal and conditioning, which optimizes the flowability.

[0078] Specifically, low-moisture biomass, such as straw, is first mechanically crushed to reduce the particle size to below 10 cm. The crushed material is then briquetted to increase its energy density. Subsequently, it is roasted at 150℃-250℃ using low-temperature syngas or other heat sources to improve its grindability and calorific value. The roasted straw powder is then further ground in a milling machine to reduce the particle size to less than 0.5 mm, forming a free-flowing powder. The milled straw powder is then transported via a dense-phase pneumatic conveying system, using carbon dioxide as a carrier, through pipelines to the first biomass injection channel 1301 of the intermediate layer three-channel composite nozzle 130 and the first inner channel 1201 of the lower layer first double-channel nozzle 120. This unit significantly improves the energy density of straw through roasting and milling processes, ensuring its stable combustion characteristics as a primary fuel. High-moisture poultry and livestock manure biomass is first crushed by a pulverizer to ensure uniform particle size, and then impurities such as mud and stones are removed through a sedimentation tank. Subsequently, dispersants and other regulators are added to the manure to adjust the slurry viscosity and ensure its fluidity meets the requirements of high-pressure conveying pumps. The conditioned liquid slurry is then pumped by a high-pressure pump to the second biomass injection channel 1303 of the three-channel composite nozzle 130. This unit achieves stable, non-drying conveying of high-moisture poultry and livestock manure biomass through physical impurity removal and chemical conditioning, while retaining moisture as a steam source for the gasification reaction. The pretreatment unit customizes processing techniques based on the differences in the physical properties of different biomass. Low-moisture biomass is baked and dehydrated, while high-moisture biomass is modulated to avoid direct spraying and nozzle clogging. The pretreated materials are precisely matched with the independent channels.

[0079] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0080] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A biomass gasification apparatus, characterized by, The gasifier includes a gasifier, and the gasifier wall is provided with at least four first biomass injection channels and at least four second biomass injection channels arranged in a circumferential direction and respectively communicating with the interior of the gasifier. The extensions of the injection directions of the first and second biomass injection channels both form regular polygons.

2. The biomass gasification apparatus according to claim 1, wherein, The biomass gasification device includes at least four three-channel composite nozzles arranged circumferentially on the furnace wall of the gasifier. The three-channel composite nozzles are connected to the interior of the gasifier. The extension lines of the center lines of the at least four three-channel composite nozzles form a regular polygon, and the regular polygon has a first inscribed circle with a diameter of D1. The three-channel composite nozzle includes a first biomass injection channel, a middle channel, and a second biomass injection channel, which are sequentially arranged from the inside out.

3. The biomass gasification apparatus according to claim 2, wherein, The biomass gasification device further includes at least four first dual-channel nozzles, which are arranged circumferentially on the furnace wall of the gasifier and communicate with the interior of the gasifier, and are located below the three-channel composite nozzle. The extension of the center lines of the at least four first dual-channel nozzles forms a regular polygon, and the regular polygon has a second inscribed circle with a diameter of D2. The first dual-channel nozzle includes a first inner channel and a first outer channel that are sequentially arranged from the inside to the outside.

4. The biomass gasification apparatus according to claim 3, wherein, The biomass gasification device further includes at least four single-channel nozzles, which are arranged circumferentially on the furnace wall of the gasifier and communicate with the interior of the gasifier. The single-channel nozzles are located above the three-channel composite nozzles. The extension lines of the center lines of the at least four single-channel nozzles form a regular polygon with a third inscribed circle of diameter D3.

5. The biomass gasification apparatus according to claim 4, wherein, The diameters of the second inscribed circle, the first inscribed circle, and the third inscribed circle are related by the following condition: D2>D1>D3.

6. The biomass gasification apparatus according to claim 5, wherein, The gasifier has an inner diameter of D4, and the ratio of D4 to D2 is 1.25-1.

7. And / or, the ratio of D4 to D1 is 1.7-3; And / or, the ratio of D4 to D3 is 3-5.

7. The biomass gasification apparatus according to claim 1, wherein The biomass gasification device includes at least four second dual-channel nozzles and at least four third dual-channel nozzles; The second dual-channel nozzles are arranged along the circumference of the gasifier on the furnace wall. The second dual-channel nozzles are in communication with the interior of the gasifier. The extensions of the center lines of the at least four second dual-channel nozzles form a regular polygon with a fourth inscribed circle of diameter D5. The second dual-channel nozzles include a second biomass injection channel and a second outer channel arranged sequentially from the inside to the outside. The third dual-channel nozzles are arranged along the circumference of the gasifier on the furnace wall. The third dual-channel nozzles are connected to the interior of the gasifier. The extensions of the center lines of the at least four third dual-channel nozzles form a regular polygon with a fifth inscribed circle of diameter D6. The third dual-channel nozzle includes a first biomass injection channel and a third outer channel sequentially arranged from the inside to the outside. The second dual-channel nozzle is located above the third dual-channel nozzle.

8. The biomass gasification apparatus according to claim 7, wherein, The diameters of the fourth and fifth inscribed circles are related by the following condition: D5 <D6。 9. A biomass processing system characterized by, Includes the biomass gasification apparatus as described in any one of claims 1-8.

10. The biomass processing system of claim 9, wherein, The biomass processing system also includes: A low-moisture biomass pretreatment device, wherein the output end of the low-moisture biomass pretreatment device is connected to the first biomass injection channel; and / or, A high-moisture biomass pretreatment device, wherein the output end of the high-moisture biomass pretreatment device is connected to the second biomass injection channel.

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