Rotary fire grate applied to hearth of biomass gasification cracking furnace

Abstract

The invention discloses a rotary fire grate applied to a hearth of a biomass gasification cracking furnace, and relates to the technical field of new energy, the rotary fire grate comprises a fire grate base, the fire grate base comprises two side plates and a cover plate, the cover plate is arranged at the bottoms of the two side plates, the bottom of the cover plate is provided with a discharge port, and the upper sides of the two side plates are provided with clamping assemblies; the smashing mechanism comprises a plurality of hollow fire grate transmission shafts, the multiple fire grate transmission shafts are in transmission connection, and crossed teeth are arranged in the middles of the adjacent fire grate transmission shafts; one end of the grate transmission shaft located on the side edge is connected with a driving mechanism, and the other end of the grate transmission shaft communicates with a two-way rotating connector which communicates with an external water supply mechanism. And the wind power cooling mechanism comprises a plurality of ventilation pipelines, each ventilation pipeline is provided with a heat dissipation opening facing the discharging opening, the two ends of the ventilation pipelines communicate with air bellow pipes, and the air bellow pipes communicate with an external air supply mechanism. Biomass particles can be completely gasified, and heat can be dissipated in time, so that stable and reliable operation of equipment is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and in particular relates to a rotary grate applied to the furnace of a biomass gasification and cracking furnace. Background Art

[0002] Biomass, a rich renewable energy source, is widely distributed and abundant. Examples include agricultural waste (straw, rice husks, etc.), forestry waste (wood chips, branches, etc.), and livestock and poultry manure. Biomass gasification technology can convert this biomass into combustible gas for power generation, heating, cooking, and other uses, providing a viable solution to the energy crisis.

[0003] Biomass vacuum gasification furnace technology uses a gasification process to convert biomass into clean, combustible gas through pyrolysis, oxidation, and reduction reactions at relatively low temperatures and in the absence of oxygen, reducing pollutant emissions. Furthermore, the gasified ash can be returned to the fields as high-quality fertilizer, achieving resource recycling and meeting the requirements of sustainable development.

[0004] Biomass gasification furnace technology can utilize the abundant biomass resources in rural areas to provide farmers with clean and convenient gas for cooking, heating and other daily needs, improve rural energy supply and living environment, and promote the development of the rural economy.

[0005] When existing biomass gasification and cracking furnaces gasify and crack biomass, some incompletely gasified biomass pieces and some large-particle residues will exist during the gasification process. If they cannot be completely gasified, they will be discharged as waste residue. At the same time, incomplete gasification of biomass leads to waste of resources or makes it difficult to discharge large-particle residues from the cracking furnace. Although there are some related treatment equipments on the market to address the above-mentioned problems, since these treatment equipments work in the high-temperature environment of the gasification and cracking furnace, they cannot dissipate heat in time, resulting in that these equipments cannot operate normally and safely. Summary of the Invention

[0006] To address the above shortcomings, the present invention provides a rotating grate for use in the furnace of a biomass gasification and cracking furnace. This grate can improve the gasification efficiency of incompletely gasified biomass, crush large particles of gasified residue, and facilitate its removal. It can also dissipate heat from the equipment in a timely manner, thereby extending its service life. The specific technical solution is as follows: A rotary grate used in a biomass gasification and cracking furnace comprises: The grate base includes two side plates and a cover plate. The cover plate is used to support the bottom of the two side plates. A discharge port is provided at the bottom of the cover plate. A middle clamping assembly is provided between the two side plates. The crushing mechanism is composed of a plurality of hollow grate drive shafts, and the plurality of grate drive shafts are connected to each other in a transmission manner. Each grate drive shaft is arranged through the upper side of the middle clamping assembly, and the middle parts of adjacent grate drive shafts are provided with cross teeth; one end of the grate drive shaft located on the side is connected to a driving mechanism, and the driving mechanism drives the plurality of grate drive shafts to rotate; the other end of each grate drive shaft is rotatably connected to a two-way rotary joint, and the two-way rotary joint is connected to an external water supply mechanism, and the end of the grate drive shaft away from the two-way rotary joint is a blocking structure; The wind cooling mechanism includes a plurality of ventilation ducts, each of which is provided with a heat dissipation port facing the discharge port; a plurality of the ventilation ducts are arranged through the lower side of the middle clamping assembly, and both ends of the plurality of ventilation ducts are connected to a bellows pipe, one end of the bellows pipe is connected to an external air supply mechanism, and the other end is a blocking structure.

[0007] Preferably, the grate drive shafts are divided into two groups of equal number, both ends of the grate drive shafts in each group are connected by gear meshing, and the outermost grate drive shaft in each group drives all the grate drive shafts in each group to rotate through the driving mechanism.

[0008] Preferably, the driving mechanism includes a driving motor and a transmission; The driving motor is connected to the transmission, and the transmission is connected to one end of the grate transmission shaft on the sidemost side of the grate base.

[0009] Preferably, the middle clamping assembly includes a plurality of middle lower covers, both ends of which are respectively clamped on the top of the slots provided on the two side plates, the middle lower cover located in the middle position is connected to a matching middle upper cover through the slot, and first circular holes, the same number as the grate drive shafts and matching each other, are provided between the middle lower cover and the middle upper cover, and the grate drive shafts pass through the first circular holes and can rotate freely; The bottom of the middle upper cover is provided with a plurality of semicircular holes, the number of which is the same as the number of the ventilation ducts and matches each other.

[0010] Preferably, both ends of the side panels are provided with end fixing seats, and the end fixing seats include matching end face lower covers and end face upper covers; An extension plate is provided on the side of the end lower cover, and a plurality of bearings corresponding to the grate drive shaft are provided on the extension plate. The grate drive shaft passes through the end fixing seat, the bearing and the middle clamping assembly in sequence and rotates freely.

[0011] Preferably, the ventilation duct comprises an inner tube and an outer tube; The outer tube is sleeved on the inner tube, and the two ends of the outer tube are sealed by the outer tube sleeve in conjunction with the water sealing flange, and the two ends of the inner tube pass through the water sealing flange to communicate with the bellows tube, and several heat dissipation ports are opened at the bottom of the inner tube and are arranged through the exhaust pipe to pass through the outer tube. Preferably, a plurality of heat dissipation beaks are provided on both sides of the inner tube, and the heat dissipation beaks pass through the outer tube.

[0012] Preferably, side clamping assemblies are provided on both sides of the middle clamping assembly, and the side clamping assemblies include a side lower cover and a side upper cover, and a second circular hole corresponding to the grate drive shaft is provided between the side lower cover and the side upper cover, and the first circular hole and the second circular hole are located on the same horizontal line; An air duct fixing component is also inserted into the slot below the side upper cover. The air duct fixing component is provided with a plurality of clamping holes corresponding to the ventilation ducts one by one, and the ventilation ducts are arranged through the clamping holes.

[0013] Preferably, graphite bushings are provided in both the first circular hole and the second circular hole.

[0014] Compared with the existing technology, the present invention has the following beneficial effects: 1. In the present invention, water circulates in the grate drive shaft through an external water supply mechanism, effectively removing heat absorbed by the grate from contact with high-temperature materials or combustion flames, thereby preventing the grate from overheating. This not only prevents the grate from deformation and damage due to overheating, thereby extending the service life of the grate, but also improves the safety of grate operation and ensures stable and reliable operation of the equipment.

[0015] 2. In the present invention, the cooling water is evenly distributed in the grate by rotating the grate drive shaft through water, thereby achieving uniform cooling of various parts of the grate, preventing local overheating, helping to maintain the stability of the overall structure of the grate, avoiding stress concentration caused by local overheating, and further improving the durability of the grate.

[0016] 3. In the present invention, proper grate cooling can make the combustion process more stable and efficient. On the one hand, the cooled grate helps to maintain a suitable combustion temperature range, so that the fuel can be fully burned under ideal temperature conditions, improve combustion efficiency, and reduce the generation of incomplete combustion products; on the other hand, the uniform grate temperature distribution is conducive to the uniform distribution and combustion of the fuel on the grate, avoiding fuel accumulation or uneven combustion due to local overheating or overcooling of the grate, thereby optimizing the entire combustion process.

[0017] 4. In the present invention, the rotating water-cooling grate can also cool the combustion or pyrolysis products. For example, if the gas temperature generated during combustion or pyrolysis is too high, the cooling water in the grate drive shaft can absorb some of the heat, reducing the gas temperature to a suitable range, facilitating subsequent processing and utilization, while also helping to prevent damage to subsequent equipment caused by the high-temperature gas.

[0018] 5. In the present invention, the rotation of the grate drive shaft can help loosen and discharge the ash on the grate, preventing excessive ash accumulation from affecting the combustion effect and the normal operation of the grate; in addition, the interaction between the cross teeth of the grate drive shaft and the extrusion with other components during the rotation process can also achieve a slag breaking function, breaking larger slag blocks into smaller particles, facilitating the discharge of ash.

[0019] 6. In this invention, the drive mechanism includes a drive motor and a transmission. The reduction ratio ensures that the grate not only removes slag during rotation but also cools the grate via central water inlet and outlet. This ensures that the grate does not deform due to high temperatures during rotation, allowing it to rotate normally.

[0020] 7. In the present invention, air is delivered to the bellows pipe and ventilation duct by an external air supply mechanism, and the grate is assisted in heat dissipation by wind power, which can better circulate water on the grate and dissipate heat by wind power, thereby achieving a rapid cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 It is a structural stereogram of the present invention.

[0023] Figure 2 It is a structural stereogram from another angle of the present invention.

[0024] Figure 3 It is a three-dimensional diagram of the internal structure of the present invention.

[0025] Figure 4 It is a top view of the present invention.

[0026] Figure 5 It is a schematic diagram of the base structure of the present invention.

[0027] Figure 6 It is a schematic diagram of the installation structure of the base and each clamping component of the present invention.

[0028] Figure 7It is a schematic diagram of the ventilation duct structure of the present invention.

[0029] Figure 8 It is a schematic diagram of the connection structure between the inner tube and the outer tube sleeve of the present invention.

[0030] Figure 9 It is a schematic diagram of the inner tube structure of the present invention.

[0031] Description of main reference numerals: 1-grate base, 2-side plate, 3-cover plate, 4-discharge port, 5-middle clamping assembly, 6-grate drive shaft, 7-cross teeth, 8-driving mechanism, 9-double-pass rotary joint, 10-wind cooling mechanism, 11-ventilation duct, 12-heat dissipation port, 13-bellows pipe, 14-gear, 15-drive motor, 16-transmission, 17-middle lower cover, 18-middle upper cover, 19-slot, 20-first round hole, 21-semicircular hole, 22-mounting hole, 2 3-arc hole, 24-end fixing seat, 25-end face lower cover, 26-end face upper cover, 27-extension plate, 28-bearing, 29-outer tube, 30-inner tube, 31-outer tube sleeve, 32-water sealing flange, 33-exhaust pipe, 34-heat dissipation beak, 35-side clamping assembly, 36-side lower cover, 37-side upper cover, 38-second circular hole, 39-duct fixing assembly, 40-clamping hole, 41-swivel joint flange, 42-water inlet, 43-water outlet. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0034] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely for descriptive purposes and to distinguish technical features. They are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Example See also Figure 1-3 The present invention discloses a rotary grate used in the furnace of a biomass gasification cracking furnace, comprising: a grate base 1, the grate base 1 comprising two side plates 2 and a cover plate 3, the cover plate 3 being supported on the bottom of the two side plates 2, and a discharge port 4 being provided at the bottom of the cover plate 3, and a middle clamping assembly 5 being provided on the upper portion of the two side plates 2; The crushing mechanism is composed of several hollow grate drive shafts 6, and the several grate drive shafts 6 are connected to each other in a transmission manner. Each grate drive shaft 6 is arranged through the upper side of the middle clamping component 5, and the middle parts of adjacent grate drive shafts 6 are provided with cross teeth; one end of the grate drive shaft 6 located on the side is connected to a driving mechanism 8, and the driving mechanism 8 drives the several grate drive shafts 6 to rotate. The other end of each grate drive shaft 6 rotates and connects to a two-way rotary joint 9, and the two-way rotary joint 9 is connected to an external water supply mechanism. The end of the grate drive shaft 6 away from the two-way spiral joint is a blocking structure; The wind cooling mechanism 10 includes several ventilation ducts 11, each of which is provided with a heat dissipation port 12 facing the discharge port 4; several ventilation ducts 11 are arranged through the lower side of the middle clamping assembly 5, and both ends of the several ventilation ducts 11 are connected to a bellows pipe 13, one end of the bellows pipe 13 is connected to an external air supply mechanism, and the other end is a blocking structure.

[0037] First of all, it should be noted that since the grate drive shaft 6 is connected to the two-way rotary joint 9 through the rotary joint flange 41, and the two-way rotary joint 9 adopts the existing two-way flow inner tube fixed rotary joint, the two-way rotary joint 9 will not rotate during the rotation of the grate drive shaft.

[0038] The working premise of this embodiment is that when biomass is gasified and burned in the gasification and cracking furnace, some large particles of residue or large particles of biomass that are not completely gasified will be produced. At this time, it is necessary to process the large particles of biomass or residue that are not completely gasified. When the large particles of biomass or residue that are not completely gasified fall onto this device, it is necessary to crush these large particles of biomass and residue that are not completely gasified for further processing.

[0039] The working principle of this embodiment is as follows: when the driving mechanism 8 is started, the driving mechanism 8 will drive all the grate drive shafts 6 to rotate, and the cross teeth 7 between the grate drive shafts 6 will crush the residue to facilitate the collection of the residue. The biomass that is not completely gasified will remain on the grate drive shaft 6 to achieve the purpose of secondary gasification and then be crushed. At the same time, the rotation of the grate drive shaft 6 can help loosen and discharge the ash on the grate, preventing excessive accumulation of ash that affects the combustion effect and the normal operation of the grate.

[0040] Since the gasification and cracking of biomass is carried out in a high-temperature cracking furnace, an external water supply mechanism is opened at this time. The water supply mechanism can adopt an existing water supply equipment, such as a water pump. Under the action of the water pump, water enters the hollow grate drive shaft 6 from the double-way rotary joint 9. The double-way rotary joint 9 used here is the existing technology. At this time, water is injected into the hollow grate drive shaft 6 through a water inlet 42 of the double-way rotary joint 9, and flows out from the other water outlet 43 of the double-way rotary joint 9 and flows into the external water receiving equipment. By allowing water to circulate in the grate drive shaft 6, it can effectively take away the heat absorbed by the grate due to contact with high-temperature materials or combustion flames, preventing the temperature inside the grate from being too high. This not only prevents the grate drive shaft 6 from being deformed or damaged due to overheating, prolongs the service life of the grate, but also improves the safety of the grate drive shaft 6 and ensures stable and reliable operation of the equipment.

[0041] In addition, under the action of the external air supply mechanism, the air is sent into the bellows pipe 13. One end of the bellows pipe 13 is connected to the air supply mechanism, and the other end is in a blocked state, so that the air is sent into each ventilation duct 11, and finally ventilated and dissipated through the heat dissipation port 12. Under the action of wind cooling combined with water circulation cooling, the furnace can be cooled in time, and the external air supply mechanism can adopt a blower.

[0042] It is also explained that the present invention is mainly used in the furnace of a gasification cracking furnace and adopts a frame structure, which is convenient for pulling out from the furnace and subsequent maintenance.

[0043] like Figure 4As shown, several grate drive shafts 6 are divided into two groups of equal number, both ends of each group of grate drive shafts 6 are meshed and connected by gears 14, and the outermost grate drive shaft 6 of each group drives each group of grate drive shafts 6 to rotate through the driving mechanism 8.

[0044] It can be understood that in this embodiment, eight grate drive shafts 6 are used and are evenly spaced and arranged side by side in the side plate 2. Different numbers of grate drive shafts 6 can be provided as needed. Every four grate drive shafts 6 are regarded as a group. Gears 14 are provided at both ends of each grate drive shaft 6 in each group. The outermost grate drive shafts 6 in each group are connected to a driving mechanism 8. When the driving mechanism starts to rotate, the grate drive shafts 6 in the same group are driven to rotate. By grouping all the grate drive shafts 6, each group is driven to rotate by an independent driving mechanism 8, providing better power to all the grate drive shafts 6, so that the ungasified carbon blocks or residues are better retained on the grate drive shafts 6 and crushed, which can ensure that the ungasified biomass fuel stays in the set high temperature area for a sufficient time to promote the complex pyrolysis reaction to fully proceed and generate more combustible gas and high-quality biochar. At the same time, the cross teeth 7 can break the larger slag blocks into smaller particles, which is convenient for the discharge of ash. Continue reading Figure 1-4 The driving mechanism 8 includes a driving motor 15 and a transmission 16 ; the driving motor 15 is connected to the transmission 16 , and the transmission 16 is connected to one end of the grate drive shaft 6 on the side of the grate base 1 .

[0045] It can be understood that the drive motor 15 is connected to a transmission 16, which can control the rotation speed of the grate drive shaft 6, causing the biomass fuel to continuously turn and move, so that it can fully contact and react with the heat, gas, etc. in the pyrolysis environment, reducing the residual unreacted fuel, thereby improving the utilization rate of the biomass fuel.

[0046] like Figure 1-6 As shown, the middle clamping assembly 5 includes a plurality of intermediate lower covers 17, the two ends of which are respectively clamped on the top of the slots 19 of the two side panels 2, and the intermediate lower cover 17 located in the middle position is plugged into the intermediate upper cover 18 that matches it through the slots 19 opened on the side panels 2. Between the intermediate lower cover 17 and the intermediate upper cover 18, there are provided first circular holes 20 that are the same in number as the grate drive shaft 6 and that match each other, and the grate drive shaft 6 passes through the first circular holes 20 and can rotate freely; the bottom of the intermediate upper cover 18 is provided with a plurality of semicircular holes 21 that are the same in number as the ventilation ducts 11 and that match each other.

[0047] It can be understood that a number of slots 19 are provided on the inner sides of the two side panels 2, and a mounting hole 22 is provided at the top of the middle slot 19. Both ends of each intermediate lower cover 17 are inserted into the mounting hole 22. There are three intermediate lower covers 17, and only the intermediate lower cover 17 in the middle position is provided with an intermediate upper cover 18. The intermediate lower covers 17 on the other two sides serve to assist in fixing the grate drive shaft 6, because the lower end of each intermediate lower cover 17 is provided with an arc-shaped hole 23 with the same number as the grate drive shaft 6, and at the top of the intermediate upper cover 18, the arc-shaped hole 23 is provided with an arc-shaped hole 23 with the same number as the grate drive shaft 6. The end is also provided with a number of identical arc-shaped holes 23, which are combined to form the above-mentioned first circular hole 20. The grate drive shaft 6 abuts against the arc-shaped hole 23 and passes through the first circular hole 20 to connect to the two-way rotary joint 9 on the other side. The middle clamping assembly 5 supports the grate drive shaft 6 to prevent the grate drive shaft 6 from shifting during rotation. At the same time, the semicircular holes 21 at the bottom of the middle upper cover 18 limit the ventilation ducts 11, thereby ensuring the support and limiting effect of the ventilation ducts 11 and the grate drive shaft 6, and improving the stability of the entire device.

[0048] Continue reading Figure 6 , both ends of the side plate 2 are provided with an end fixing seat 24, and the end fixing seat 24 includes an end surface lower cover 25 and an end surface upper cover 26 that match each other; An extension plate 27 is provided on the side of the end lower cover 25. There are several bearings 28 on the extension plate 27 corresponding to the grate drive shaft 6. The grate drive shaft 6 passes through the end fixing seat 24, the bearing 28 and the middle clamping assembly 5 in sequence and rotates freely.

[0049] It can be understood that a first circular hole 20 for the grate drive shaft 6 to pass through is also provided between the end face lower cover 25 and the end face upper cover 26, and a bearing seat is provided on the extension plate 27, on which a bearing 28 is fixed, which helps to rotate the grate drive shaft 6 and at the same time provides better support and limitation for the grate drive shaft 6; in addition, the running gear 14 is on the periphery of the furnace, which is convenient for refueling, and avoids the high temperature inside the furnace, which causes the lubricating oil in the bearing 28 to dry out and the bearing 28 to be unable to operate.

[0050] like Figure 1 、 2 As shown in Figures 7, 8, and 9, the ventilation duct 11 includes an inner tube 30 and an outer tube 29; an outer tube sleeve 31 is provided on the inner tube 30, and both ends of the outer tube 29 are sealed by the outer tube sleeve 31 in conjunction with the water sealing flange 32, and both ends of the inner tube 30 pass through the water sealing flange 32 to communicate with the bellows tube 13, and a number of heat dissipation outlets 12 are opened at the bottom of the inner tube 30 and pass through the outer tube 29 through the exhaust pipe 33.

[0051] It can be understood that the inner diameter of the outer tube 29 is larger than the outer diameter of the inner tube 30, and there is a cavity structure between the inner tube 30 and the outer tube 29. The outer tube 29 protects the inner tube 30, while the inner tube 30 mainly plays the role of ventilation and heat dissipation. When the external air supply mechanism is working, the outside wind will enter the inner tube 30 through the bellows tube 13 and be discharged from the exhaust pipe 33, blowing air to dissipate heat for the cracking furnace, thereby achieving a certain cooling effect.

[0052] Continue reading Figure 7-9 A plurality of heat dissipation beaks 34 are provided on both sides of the inner tube 30 , and the heat dissipation beaks 34 pass through the outer tube 29 .

[0053] It can be understood that a pair of V-shaped heat dissipation beaks 34 are arranged at equal intervals on both sides of the inner tube 30. Combined with the heat dissipation port 12 at the bottom, air is blown above and below the ventilation duct 11, which can evenly blow air to dissipate heat inside the grate drive shaft 6 and the furnace, making the heat dissipation effect more comprehensive and uniform, and covering a larger area.

[0054] like Figure 6 As shown, side clamping assemblies 35 are provided on both sides of the middle clamping assembly 5. The side clamping assembly 35 includes a side lower cover 36 and a side upper cover 37. A second circular hole 38 corresponding to the grate drive shaft 6 is provided between the side lower cover 36 and the side upper cover 37. The first circular hole 20 and the second circular hole 38 are located on the same horizontal line. An air duct fixing assembly 39 is also inserted into the lower portion of the side upper cover 37 along the slot 19 . The air duct fixing assembly 39 is provided with a plurality of clamping holes 40 corresponding to the ventilation ducts 11 , and the ventilation ducts 11 are arranged through the clamping holes 40 .

[0055] It can be understood that the clamping hole 40 of the air duct fixing assembly 39 can better fix and support the ventilation duct 11, and the second circular hole 38 of the side clamping assembly 35 can better fix and support the grate drive shaft 6, thereby improving its stability. Similarly, the ventilation duct 11 is arranged at equal intervals inside the base, and the ventilation and heat dissipation are more uniform, and the coverage area is more comprehensive. The air duct fixing assembly 39 is also inserted into the slot 19 under the end fixing seat 24, and both are supported by the cover plate 3. The structure of the air duct fixing assembly 39 is similar to that of the side clamping assembly 35, and no further explanation will be given.

[0056] It should be noted that graphite bushings are provided in both the first circular hole 20 and the second circular hole 38. The graphite bushings (not shown) facilitate the rotation of the grate drive shaft 6 and provide good protection for the grate drive shaft 6.

[0057] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A rotary grate used in the furnace of a biomass gasification and cracking furnace, characterized in that: include: A grate base (1), the grate base (1) comprising two side plates (2) and a cover plate (3), the cover plate (3) being used to support the bottoms of the two side plates (2), and a discharge port (4) being provided at the bottom of the cover plate (3), and a middle clamping assembly (5) being provided between the two side plates (2); A crushing mechanism, wherein the crushing mechanism is composed of a plurality of hollow grate drive shafts (6), wherein the plurality of grate drive shafts (6) are connected in a transmission manner, wherein each of the grate drive shafts (6) is arranged through the upper side of the middle clamping assembly (5), and the middle parts of the adjacent grate drive shafts (6) are provided with cross teeth (7); one end of the grate drive shaft (6) located on the side is connected to a driving mechanism (8), and the driving mechanism (8) drives the plurality of grate drive shafts (6) to rotate; the other end of each grate drive shaft (6) is rotatably connected to a two-way rotary joint (9), and the two-way rotary joint (9) is connected to an external water supply mechanism, and the end of the grate drive shaft (6) away from the two-way rotary joint (9) is a blocking structure; A wind cooling mechanism (10) includes a plurality of ventilation ducts (11), each of the ventilation ducts (11) being provided with a heat dissipation port (12) facing the discharge port (4); the plurality of ventilation ducts (11) are arranged through the lower side of the middle clamping assembly (5), and both ends of the plurality of ventilation ducts (11) are connected to a bellows pipe (13), one end of the bellows pipe (13) is connected to an external air supply mechanism, and the other end is a blocking structure.

2. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 1, characterized in that: The plurality of grate drive shafts (6) are divided into two groups of equal number, both ends of the grate drive shafts (6) in each group are meshed and connected via gears (14), and the outermost grate drive shaft (6) in each group drives all the grate drive shafts (6) in each group to rotate via the driving mechanism (8).

3. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 1, characterized in that: The driving mechanism (8) includes a driving motor (15) and a transmission (16); The driving motor (15) is connected to the transmission (16), and the transmission (16) is connected to one end of the grate transmission shaft (6) on the sidemost side of the grate base (1).

4. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 1, characterized in that: The middle clamping assembly (5) includes a plurality of middle lower covers (17), both ends of the middle lower covers (17) are respectively clamped on the upper part of the slots (19) opened on the two side plates (2), the middle lower cover (17) located in the middle position is connected to the middle upper cover (18) through the slots (19), and the same number of first circular holes (20) as the number of the grate drive shafts (6) and matching each other are opened between the middle lower covers (17) and the middle upper cover (18), and the grate drive shafts (6) pass through the first circular holes (20) and can rotate freely; The bottom of the middle upper cover (18) is provided with a plurality of semicircular holes (21) whose number is the same as the number of the ventilation ducts (11) and which match each other.

5. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 4, characterized in that: Both ends of the side plate (2) are provided with end fixing seats (24), and the end fixing seats (24) include matching end face lower covers (25) and end face upper covers (26); An extension plate (27) is provided on the side of the end face lower cover (25), and a plurality of bearings (28) corresponding to the grate drive shaft (6) are provided on the extension plate (27). The grate drive shaft (6) passes through the end fixing seat (24), the bearing (28) and the middle clamping assembly (5) in sequence and rotates freely.

6. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 1, characterized in that: The ventilation duct (11) comprises an outer tube (29) and an inner tube (30); The outer tube (29) is sleeved on the inner tube (30), and both ends of the outer tube (29) are sealed by the outer tube sleeve (31) and the water sealing flange (32), and both ends of the inner tube (30) pass through the water sealing flange (32) and communicate with the bellows tube (13), and a plurality of heat dissipation ports (12) are opened at the bottom of the inner tube (30) and pass through the outer tube (29) through the exhaust pipe (33).

7. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 6, characterized in that: A plurality of heat dissipation beaks (34) are also provided on both sides of the inner tube (30), and the heat dissipation beaks (34) are arranged to pass through the outer tube (29).

8. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 4, characterized in that: Side clamping assemblies (35) are provided on both sides of the middle clamping assembly (5), and the side clamping assemblies (35) include a side lower cover (36) and a side upper cover (37), and a second circular hole (38) corresponding to the grate drive shaft (6) is provided between the side lower cover (36) and the side upper cover (37), and the first circular hole (20) and the second circular hole (38) are located on the same horizontal line; An air duct fixing assembly (39) is also inserted into the lower portion of the side upper cover (37) along the slot (19). The air duct fixing assembly (39) is provided with a plurality of clamping holes (40) corresponding to the ventilation ducts (11) one by one. The ventilation ducts (11) are arranged through the clamping holes (40).

9. The rotary grate used in the furnace of a biomass gasification and cracking furnace according to claim 8, characterized in that: Graphite bushings are provided in both the first circular hole (20) and the second circular hole (38).

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