Biomass boiler stokehole feeding system and fuel distribution device thereof

Abstract

According to the biomass boiler stokehole feeding system and the fuel distribution device of the biomass boiler stokehole feeding system, the fuel distribution device is arranged between the spiral material taking machine and the material falling pipe, the driving mechanism is used for driving the rotating roller on the rotating shaft to rotate forwards or reversely, falling fuel is conveyed into the material falling pipe on one side of the rotating direction of the rotating shaft through the rotating roller, and meanwhile, the fuel distribution device is arranged on the material falling pipe. Conveying of falling fuel is improved by adjusting the rotating speed of the rotating shaft. According to the arrangement, the quantity of biomass fuel discharged from the spiral material taking machine is controlled and distributed again, and the purpose of preventing the material falling pipe from being blocked and covered is achieved through rotation of the fuel distribution device, the problem of partial combustion of a boiler caused by uneven fuel distribution is solved, and safe, economical and stable operation of a biomass unit can be effectively guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of biomass fuel delivery systems, in particular to a biomass boiler furnace feeding system and a fuel distribution device thereof. Background Art

[0002] Currently, the biomass fuels used in biomass direct-fired power plants primarily include corn stalks and wheat straw. The biomass direct-fired power generation process involves transporting the biomass fuel to an open-air material yard / drying shed. Then, using underground screw conveyors and belt conveyors, the fuel is transported to the biomass boiler's silo. The fuel then passes through a screw reclaimer, a drop pipe, a screw feeder, and a water-cooling jacket before being delivered to the biomass boiler for combustion.

[0003] The screw conveyor used in the above process is the core equipment of the biomass direct-fired power plant's furnace feeding system and is the direct factor in determining the safe, economical, and stable operation of the unit. In biomass direct-fired power plants, blockages and bulging in the feeding and loading systems are one of the biggest factors contributing to reduced unit output. It has been verified that the most frequent blockages and bulging occur in the drop pipe, accounting for over 85% of all blockages and bulging in the feeding and loading systems. These blockages and bulging occur due to the light weight, high porosity, large volume, and long transport radius of biomass straw fuel.

[0004] In fact, for ease of transportation, biomass fuel is typically pressurized during collection and bundled into square or round bales using plastic ropes or netting. The bales are then transported to the biomass power plant's open-air storage yard or drying shed for unbundling. Due to its inherent properties, the unbundled fuel expands in volume. This volume decreases as it passes through the underground screw conveyor, which compresses it. It then expands again when it is transported to the belt conveyor. Consequently, the fuel expands again within the drop pipe after being transported to the furnace silo and extruded by the reclaimer screw. Furthermore, to ensure boiler tightness, the combined effects of feeder compression and water-cooling jacket resistance create a continuous plug within the water-cooling jacket during boiler operation. Therefore, the drop pipe connecting the reclaimer to the screw feeder features a larger top and smaller bottom end. Furthermore, the biomass boiler's design requires that straw fuel be crushed to less than 100 mm, but in reality, straw fuel is typically longer than 200 mm. This is because maintaining the 100 mm length requires frequent replacement of harvesting cutters, significantly increasing operating costs and reducing efficiency. Furthermore, the collection period for straw fuel in my country is very short. For example, in northern China, mechanical harvesting requires the soil to reach a certain hardness, and all straw must be removed from the fields before snow covers the land. This leaves less than a month for harvesting and baling the straw. After the straw fuel is delivered to biomass power plants, secondary crushing and rope netting are generally not performed to maintain operational costs. This causes the straw fuel to become entangled in the rope nets, further increasing its volume and making it more likely to become clogged in the distributor within the feed pipe.

[0005] Therefore, how to overcome the above technical defects is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] The purpose of the utility model is to provide a biomass boiler furnace feeding system and a fuel distribution device thereof, which can effectively prevent the occurrence of material blockage and material bulging.

[0007] In order to solve the above technical problems, the utility model provides a fuel distribution device for the front feeding system of a biomass boiler, which is located between the inlet ends of the two drop pipes and is used to reasonably distribute the amount of fuel entering the two drop pipes. It includes a driving mechanism, a rotating shaft and a rotating roller. The movable end of the driving mechanism is connected to one end of the rotating shaft, and the other end of the rotating shaft is provided with the rotating roller. The rotating roller is used to distribute the amount of fuel fed into the two drop pipes by two groups of spiral feeders.

[0008] Optionally, in the above fuel distribution device, a plurality of material-diverting plates are arranged at intervals in the circumferential direction of the rotating roller.

[0009] Optionally, in the above-mentioned fuel dispensing device, the driving mechanism includes a driving motor and a reducer, the output end of the driving motor is connected to the reducer, and the output end of the reducer is connected to the rotating shaft and is used to control the forward or reverse rotation of the rotating shaft.

[0010] The utility model also provides a biomass boiler furnace feeding system, comprising a furnace silo, at least two groups of spiral feeders, a fixed distributor, at least two drop pipes, at least two groups of spiral feeders and the fuel distribution device as described above;

[0011] There are multiple groups of spiral feeders in the furnace hopper, a drop pipe is provided under each group of spiral feeders, a group of spiral feeders is provided in one drop pipe, a fixed distributor is provided between the entrances of two adjacent drop pipes, and the fuel distribution device is provided on the fixed distributor.

[0012] Optionally, in the above-mentioned biomass boiler furnace feeding system, the number of each group of the screw reclaimers and / or each group of the screw feeders is multiple.

[0013] Optionally, in the above-mentioned biomass boiler furnace feeding system, an anti-rope entanglement device is provided below the fuel distribution device to prevent the rope net of the material bag from being entangled.

[0014] Optionally, in the above-mentioned biomass boiler furnace feeding system, the anti-rope entanglement device includes a base and a scraper detachably arranged on the base.

[0015] Optionally, in the above-mentioned biomass boiler furnace feeding system, the blade of the scraper is in contact with the surface of the rotating roller, or the blade of the scraper is in contact with the surface of the rotating shaft.

[0016] Optionally, the biomass boiler furnace feeding system further includes a plurality of monitoring devices and control devices;

[0017] The monitoring device is used to monitor the fuel position in the corresponding drop pipe or the furnace front silo;

[0018] The control device is respectively connected to multiple monitoring devices, the driving mechanism, multiple groups of screw reclaimers and multiple groups of screw feeders. The control device is used to control the speed and direction of the driving mechanism, and control the speed of the screw reclaimer and the screw feeder according to the fuel position and boiler load monitored by the monitoring device.

[0019] Optionally, in the above-mentioned biomass boiler furnace feeding system, the rotating shaft is provided with a bearing seat on both sides of the rotating roller, and two supports are provided on the fixed distributor, and the two supports are respectively connected to the two bearing seats.

[0020] The utility model provides a fuel distribution device for a biomass boiler furnace feeding system, which has the following beneficial effects:

[0021] The fuel distribution device is located between the screw reclaimer and the drop tube. A drive mechanism drives the rotating rollers on the shaft in forward or reverse rotation, transferring the falling fuel through the rollers to the drop tube on the side of the shaft's rotational direction. Simultaneously, the shaft's rotational speed is adjusted to improve the delivery of the falling fuel. This arrangement controls and redistributes the biomass fuel flowing out of the screw reclaimer, and prevents the drop tube from clogging and bulging through the rotation of the fuel distribution device. This reduces the problem of uneven boiler combustion caused by uneven fuel distribution, effectively ensuring the safe, economical, and stable operation of the biomass unit.

[0022] The utility model also provides a biomass boiler furnace feeding system, including the above-mentioned fuel distribution device, which has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A front view of a biomass boiler furnace feeding system provided by an embodiment of the utility model;

[0025] Figure 2 A side view of a biomass boiler furnace feeding system provided by an embodiment of the present utility model;

[0026] Figure 3 A schematic diagram of a biomass boiler furnace feeding system provided in an embodiment of the present utility model;

[0027] Figure 4 This is a structural schematic diagram of a fuel distribution device of a biomass boiler furnace feeding system provided in an embodiment of the utility model.

[0028] In the above picture:

[0029] 100- fuel distribution device; 110- drive motor; 120- reducer; 130- rotating roller; 140- bearing seat;

[0030] 200-furnace silo;

[0031] 300-screw reclaimer;

[0032] 400-Anti-tangling device;

[0033] 500-fixed distributor;

[0034] 600-dropping tube;

[0035] 700-Screw feeder. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] The core of the utility model is to provide a biomass boiler furnace feeding system and a fuel distribution device thereof, which can effectively prevent the occurrence of material blockage and material bulging.

[0038] In order to enable those skilled in the art to better understand the technical solution provided by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Specifically, please refer to Figure 1-Figure 4 The present invention provides a fuel distribution device 100 for a biomass boiler furnace feeding system. The fuel distribution device 100 is located between the inlet ends of two drop pipes 600 and is used to reasonably distribute the amount of fuel entering the two drop pipes 600.

[0040] The fuel distribution device 100 includes a drive mechanism, a rotating shaft, and a rotating roller 130. The fixed end of the drive mechanism is positioned above the two drop tubes 600. The movable end of the drive mechanism is connected to one end of the rotating shaft. The other end of the rotating shaft is provided with a rotating roller 130, which is used to distribute the fuel delivered to the two drop tubes 600 by the two sets of spiral reclaimers 300. By controlling the distribution of the fuel at the outlet of the spiral reclaimers 300, the fuel is properly distributed among the different drop tubes 600, preventing the fuel level in the furnace silo 200 from being too high. This prevents the fuel in the lower portion of the furnace silo 200 from being compressed by the gravity of the fuel above, which could cause blockage and bulging.

[0041] The fuel distribution device 100 for the biomass boiler feed system provided in this solution is disposed between the screw reclaimer 300 and the drop tube 600. A drive mechanism drives the rotating roller 130 on the rotating shaft to rotate forward or reverse, transporting the falling fuel through the rotating roller 130 to the drop tube 600 on the side of the rotating shaft. Simultaneously, the speed of the rotating shaft is adjusted to improve the delivery of the falling fuel. This arrangement, by controlling and redistributing the amount of biomass fuel exiting the screw reclaimer 300 and preventing the drop tube 600 from clogging due to the rotation of the fuel distribution device 100, reduces the problem of uneven boiler burning caused by uneven fuel distribution and effectively ensures the safe, economical, and stable operation of the biomass unit.

[0042] In order to distribute the fuel more effectively, a plurality of fuel-diverting plates are provided at intervals in the circumferential direction of the rotating roller 130 . Specifically, the plurality of fuel-diverting plates are evenly distributed on the rotating roller 130 .

[0043] Furthermore, the drive mechanism includes a drive motor 110 and a reducer 120. The output end of the drive motor 110 is connected to the reducer 120, and the output end of the reducer 120 is connected to the rotating shaft and is used to control the forward or reverse rotation of the rotating shaft. The drive motor 110 and the reducer 120 can be directly connected via a brake, cam, worm gear, gear, or other means.

[0044] By adjusting the speed and direction of rotation of the reducer 120, the system prevents blockage and bulging of the feed pipe 600 while also providing fuel distribution. This flexible adjustment improves the reliability of the biomass boiler's front feed system, thereby ensuring safe, economical, and stable boiler operation. The present invention has a simple structure, low cost, and is easy and quick to install, requiring no special technical expertise from maintenance personnel.

[0045] In addition, the present solution also provides a biomass boiler furnace feeding system, a furnace silo 200, at least two groups of spiral feeders 300, a fixed distributor 500, at least two drop pipes 600, at least two groups of spiral feeders 700 and a fuel distribution device 100 as in the above specific embodiment.

[0046] There are multiple groups of spiral feeders 300 in the furnace silo 200, and a drop pipe 600 is set below each group of spiral feeders 300. A group of spiral feeders 700 is set in a drop pipe 600, and a fixed distributor 500 is set between the entrances of two adjacent drop pipes 600. A fuel distribution device 100 is set on the fixed distributor 500.

[0047] It should be noted that the screw reclaimer 300, fixed distributor 500, drop pipe 600, and screw feeder 700 are arranged sequentially from top to bottom in the furnace silo 200. The screw reclaimer 300 is the device that delivers fuel through the drop pipe 600 to the screw feeder 700. The screw feeder 700 is the last stage of power equipment before the fuel enters the furnace, delivering the fuel into the furnace through the water-cooling jacket.

[0048] Obviously, the biomass boiler furnace feeding system including the above-mentioned fuel distribution device 100 has the same beneficial effects, which will not be further described here.

[0049] In a specific embodiment, the number of each set of spiral reclaimers 300 can be one or more. The number of each set of spiral feeders 700 can be one or more. In a biomass boiler furnace feeding system, multiple sets of spiral reclaimers 300 can be spaced apart in a furnace silo 200. Below each set of spiral reclaimers 300 corresponds to a drop pipe 600, and a set of spiral feeders 700 is set at the outlet of the drop pipe 600. A fixed distributor 500 is set at the inlet of two adjacent drop pipes 600, and a fuel distribution device 100 is installed above the fixed distributor 500.

[0050] In order to prevent the rope net of the fuel package from being entangled on the rotating roller 130 or the rotating shaft, an anti-entanglement device 400 is provided below the fuel distribution device 100.

[0051] In a specific embodiment, the anti-roping device 400 includes a base and a scraper detachably mounted on the base. The scraper can scrape the rope net and the rope net enters the drop pipe 600 along with the fuel.

[0052] The anti-ropes device 400 can be arranged below the rotating roller 130 or the rotating shaft. Specifically, the blade of the scraper fits with the surface of the rotating roller 130, or the blade of the scraper fits with the surface of the rotating shaft, which can easily scrape off the rope net wrapped around the surface.

[0053] This solution also includes multiple monitoring devices and control devices. The monitoring devices are used to monitor the fuel level in the corresponding drop pipe 600 or furnace hopper 200. The control devices are respectively connected to the multiple monitoring devices, the drive mechanisms, the multiple sets of screw reclaimers 300, and the multiple sets of screw feeders 700. The control devices are used to control the speed and direction of the drive mechanisms, as well as the speed of the screw reclaimers 300 and screw feeders 700, based on the fuel level and boiler load monitored by the monitoring devices.

[0054] During actual operation, the speed of the screw feeder 700 is adjusted according to the needs of the boiler load, the speed of the screw reclaimer 300 is adjusted according to the speed of the screw feeder 700 and the position of the furnace front silo 200, and the rotation direction and speed of the fuel distribution device 100 are adjusted according to the speed and discharge amount of the screw reclaimer 300.

[0055] For example, if the material level on one side of the second screw reclaimer in the furnace silo 200 is higher than that on the first screw reclaimer, in order to prevent the material level in the furnace silo 200 from being too high and causing blockage, it is necessary to increase the speed of the second screw reclaimer and reduce the speed of the first screw reclaimer. At this time, the fuel volume at the outlet of the second screw reclaimer will be higher than that at the first screw reclaimer, and the straw fuel will be squeezed and expanded from the outlet of the second screw reclaimer to the first screw reclaimer (such as falling on the outlet of the first screw reclaimer). Figure 1 The fixed distributor 500 of the drop pipe 600 will cause a blockage of the material). At this time, the fuel distribution device 100 is started and rotated toward the first set of screw feeders. The speed is controlled according to the discharge amount of the screw reclaimer 300, which will produce the following three effects:

[0056] 1. The outlet of the second screw reclaimer squeezes and expands the straw fuel toward the first screw reclaimer. The rotation of the fuel distribution device 100 produces a separation effect, which reduces the volume of fuel entering the drop pipe 600 on the side of the second screw feeder, preventing material blockage and bulging.

[0057] 2. The rotation of the fuel distribution device 100 plays a role in moving the straw fuel, which will cause the straw fuel to become unstable and will not accumulate, thus preventing the fuel from being blocked or fluffed;

[0058] 3. The rope net in the straw fuel will rotate with the fuel distribution device 100, and will fall into the drop pipe 600 through the obstruction of the anti-roping device 400, and will not be entangled on the rotating shaft, thereby preventing the rope from being entangled, preventing the drop space from being reduced due to rope entanglement, preventing material blockage and bulking, and ensuring the operational reliability of the fuel distribution device 100.

[0059] In summary, the biomass boiler furnace feeding system provided by the present invention controls the rotation speed of different screw reclaimers 300 according to the load requirements of the unit, and controls the fixed distributor 500 installed at the position where the material blockage is most likely to occur in the feeding system (i.e., above the drop pipe 600), as follows Figure 1 The direction and speed of the fuel distribution device 100 (as shown) are controlled to control the feed amount of different screw feeders 700. The rotation of the fuel distribution device 100 prevents the straw fuel from accumulating, thereby preventing the straw fuel from clogging the roof material, and can also achieve the effect of evenly distributing the fuel and preventing uneven burning of the boiler.

[0060] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0061] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A fuel distribution device for a biomass boiler furnace feeding system, characterized in that: Located between the inlet ends of the two drop pipes (600), it is used to reasonably distribute the amount of fuel entering the two drop pipes (600), and includes a driving mechanism, a rotating shaft, and a rotating roller (130). The movable end of the driving mechanism is connected to one end of the rotating shaft, and the other end of the rotating shaft is provided with the rotating roller (130). The rotating roller (130) is used to distribute the amount of fuel fed into the two drop pipes (600) by the two groups of spiral reclaimers (300).

2. The fuel dispensing device according to claim 1, characterized in that A plurality of material-diverting plates are arranged at intervals in the circumferential direction of the rotating roller (130).

3. The fuel dispensing device according to claim 1, characterized in that The driving mechanism comprises a driving motor (110) and a reducer (120), wherein an output end of the driving motor (110) is connected to the reducer (120), and an output end of the reducer (120) is connected to the rotating shaft and is used to control the forward or reverse rotation of the rotating shaft.

4. A biomass boiler furnace feeding system, characterized in that: It comprises a furnace front silo (200), at least two groups of spiral reclaimers (300), a fixed distributor (500), at least two drop pipes (600), at least two groups of spiral feeders (700), and a fuel distribution device (100) according to any one of claims 1 to 3; A plurality of groups of the spiral reclaimers (300) are arranged in the furnace front silo (200), a drop pipe (600) is arranged below each group of the spiral reclaimers (300), a group of the spiral feeders (700) is arranged in one drop pipe (600), a fixed distributor (500) is arranged between the entrances of two adjacent drop pipes (600), and the fuel distribution device (100) is arranged on the fixed distributor (500).

5. The biomass boiler furnace feeding system according to claim 4, characterized in that: The number of each group of the spiral reclaimers (300) and / or each group of the spiral feeders (700) is multiple.

6. The biomass boiler furnace feeding system according to claim 4, characterized in that: An anti-rope entanglement device (400) is provided below the fuel distribution device (100) to prevent the rope net of the fuel bag from being entangled.

7. The biomass boiler furnace feeding system according to claim 6, characterized in that: The anti-roping device (400) comprises a base and a scraper arranged on the base.

8. The biomass boiler furnace feeding system according to claim 7, characterized in that: The blade of the scraper is in contact with the surface of the rotating roller (130), or the blade of the scraper is in contact with the surface of the rotating shaft.

9. The biomass boiler furnace feeding system according to claim 4, characterized in that: It also includes a number of monitoring devices and control devices; The monitoring device is used to monitor the fuel position in the corresponding drop pipe (600) or the furnace front silo (200); The control device is respectively connected to a plurality of the monitoring devices, the driving mechanism, a plurality of groups of the screw reclaimers (300) and a plurality of groups of the screw feeders (700). The control device is used to control the rotation speed and direction of the driving mechanism, and the rotation speed of the screw reclaimers (300) and the screw feeders (700) according to the fuel position and boiler load monitored by the monitoring device.

10. The biomass boiler furnace feeding system according to claim 4, characterized in that: The rotating shaft is provided with a bearing seat (140) on both sides of the rotating roller (130), and the fixed distributor (500) is provided with two supports, and the two supports are respectively connected to the two bearing seats (140).

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