Material distributing device of boiler, boiler and material distributing method of boiler

Abstract

The invention relates to a material distributing device of a boiler, the boiler and a material distributing method.The material distributing device of the boiler is arranged between an air-powder mixing bin and a boiler body, and the material distributing device comprises a material conveying pipe communicating with the downstream of the air-powder mixing bin; the adjusting assemblies are sequentially connected to the material conveying pipe in the material conveying direction and used for adjusting the pipeline opening degree of the material conveying pipe; and the multiple material distributing pipes are connected to the upstream of the boiler body in parallel, and the multiple material distributing pipes communicate with the downstream of the multiple adjusting assemblies in a one-to-one correspondence mode. When the boiler body operates at low load, the pulverized coal entering the material conveying pipe cannot flow towards the downstream connecting pipe, so that the pulverized coal entering amount of the material distributing pipes is reduced, in addition, the pulverized coal is distributed into the multiple material distributing pipes which are arranged in parallel, the pulverized coal entering amount is more easily adjusted and controlled, and the pulverized coal conveying efficiency is improved. And therefore, the combustion stability can be maintained more conveniently.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boiler combustion, and in particular to a material distribution device of a boiler, a boiler and a material distribution method thereof. Background Art

[0002] Due to weather, seasons, and day-night changes, wind and solar power generation are intermittent, volatile, and random, resulting in a huge peak-to-valley ratio in power generation. In order to solve the dilemma of new energy consumption, the flexibility of thermal power generation and the use of coal-fired thermal power units for peak regulation are inevitable requirements for stable power supply.

[0003] At present, when the pulverized coal boiler in a power plant is operated at low load with deep peak regulation, the calorific value of the coal is greatly reduced, and the furnace temperature is lowered, resulting in a decrease in the stability of the pulverized coal combustion. The high pulverized coal concentration easily causes a high temperature in the furnace, resulting in waste, and it is difficult to control the pulverized coal concentration to maintain stable low-load operation of the boiler. Summary of the invention

[0004] The purpose of the present disclosure is to provide a material distribution device for a boiler, a boiler and a material distribution method thereof, so as to at least partially solve the technical problems existing in the related art.

[0005] According to a first aspect of the present disclosure, there is provided a material distribution device for a boiler, which is arranged between an air-powder mixing bin and a boiler body, and the material distribution device comprises: A material conveying pipe connected to the downstream of the air-powder mixing bin; A plurality of adjustment components are sequentially arranged on the material conveying pipe along the material conveying direction, and are used to adjust the pipe opening of the material conveying pipe respectively; and A plurality of material distribution pipes are connected to the upstream of the boiler body, and the plurality of material distribution pipes are connected and arranged one by one to the downstream of the plurality of regulating components.

[0006] Optionally, two radially symmetrical arc-shaped through holes are opened on the peripheral wall of the feed pipe, and the adjustment assembly includes two symmetrically arranged baffles that each pass through the corresponding through holes, and the two baffles are used to move toward or away from each other, and the two baffles are configured to be able to jointly construct a circular plate structure with an outer diameter matching the inner diameter of the feed pipe when engaged with each other.

[0007] Optionally, the adjustment component further includes: A bidirectional screw rod extending in the radial direction of the feed pipe; A driving motor drives the bidirectional screw to rotate; and The two sliding blocks are respectively screwed on the two ends of the bidirectional screw rod and fixedly connected with the two baffles in a one-to-one correspondence.

[0008] Optionally, the adjustment assembly further comprises a mounting plate sleeved on the outer wall of the feed pipe, the mounting plate is constructed to be hollow inside, and the slider and the bidirectional screw are accommodated in the mounting plate.

[0009] Optionally, the adjustment assembly further includes a connecting rod fixedly connected between the sliding block and the baffle, and the connecting rod is constructed as an L-shaped structure.

[0010] Optionally, the material distribution device further includes a one-way valve arranged on the material distribution pipe.

[0011] Optionally, the inner diameter of the material conveying pipe gradually increases along the material conveying direction.

[0012] According to a second aspect of the present disclosure, there is provided a boiler, comprising: Boiler body; A material distribution device, arranged upstream of the boiler body, the material distribution device is the material distribution device described above; an air-powder mixing bin, arranged upstream of the material distribution device, for mixing compressed air and coal powder and outputting the air-powder to the material distribution device; and The pulverized coal bin is arranged upstream of the air-powder mixing bin and is used for providing pulverized coal.

[0013] Optionally, a guide grating ring with an outer diameter matching the inner diameter of the air-powder mixing bin is fixedly installed on the inner circumferential wall of the air-powder mixing bin, and a plurality of guide grating plates are fixedly installed on the inner circumferential wall of the guide grating ring, and the plurality of guide grating plates are parallel to each other and spaced apart in a direction perpendicular to the feeding direction.

[0014] According to a third aspect of the present disclosure, a method for dividing a material of a boiler is provided. The method for dividing a material of a boiler is applied to the boiler described above. The method for dividing a material of a boiler comprises: Passing the pulverized coal into the air-powder mixing bin, so that the air carries the pulverized coal into the pulverized coal conveying pipe; and When the boiler body is running at a low load, the regulating assembly is used to close some sections of the feed pipe that are not needed.

[0015] Through the above technical scheme, multiple regulating components are connected to the feed pipe, and multiple distribution pipes are arranged in parallel between the boiler body and the feed pipe, so that each regulating component can independently control the amount of pulverized coal flowing to the boiler body, ensuring that the boiler body can obtain a suitable supply of pulverized coal under different operating conditions. When the boiler body is operating at low load, the air and powder entering the feed pipe cannot flow to the downstream feed pipe, thereby reducing the amount of pulverized coal entering the distribution pipe, thereby optimizing the combustion efficiency of the boiler body and the stability of the combustion process, and reducing the risk of failure of the boiler body.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 and Figure 2 is a partial structural perspective view of a boiler provided in an exemplary embodiment of the present disclosure; Figure 3 is a schematic diagram of a partial structure of a material distribution device provided in an exemplary embodiment of the present disclosure; Figure 4 is a perspective view of an adjustment assembly provided by an exemplary embodiment of the present disclosure; Figure 5 is a partial structural stereogram of an adjustment assembly provided by an exemplary embodiment of the present disclosure; Figure 6 is a partial structural cross-sectional view of a boiler provided in an exemplary embodiment of the present disclosure; Figure 7 Detailed description of the invention The figure is a flow chart of a boiler material dividing method provided in an exemplary embodiment of the present disclosure.

[0018] Description of Reference Numerals 1- boiler body; 11- burner; 12- ignition head; 13- connection hole; 2- material distribution device; 21- material delivery pipe; 211- through hole; 212- explosion-proof valve; 213- wear-proof layer; 22- adjustment component; 221- baffle; 222- slider; 223- two-way screw rod; 224- drive motor; 225- mounting plate; 225a- mounting hole; 225b- storage slot; 225c- rotation hole; 226- connecting rod; 23- material distribution pipe; 24- one-way valve; 25- rotation hole; 3- air-powder mixing bin; 31- guide grid ring; 32- guide grid plate; 33- material discharge hole; 34- air hole; 4- coal powder bin; 41- material discharge pipe; 61- controller; 62- powder flowmeter; 63- control valve; 7- support rod. DETAILED DESCRIPTION

[0019] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0020] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", refer to the outline of the corresponding parts themselves; the directional words used, such as "top", "bottom", "horizontal" and "vertical", are defined based on the usage habits of the boiler provided in the present disclosure. Specifically, reference can be made to Figure 1In the direction of the drawing shown, the side indicated by the Z arrow is the top and the top, and the opposite side is the bottom and the bottom, the X direction refers to the horizontal direction, and the Z direction refers to the vertical direction; "upstream" and "downstream" refer to the conveying direction of the coal powder. The terms used in this disclosure, such as "first" and "second", are used to distinguish one element from another element, and do not have order and importance. In addition, when the following description refers to the drawings, the same reference numerals in different drawings represent the same or similar elements.

[0021] Reference Figure 1-Figure 5 The present disclosure provides a material distribution device for a boiler, and the material distribution device 2 can be arranged between the air-powder mixing bin 3 and the boiler body 1, and the material distribution device 2 can include a delivery pipe 21, a plurality of adjustment components 22 and a plurality of delivery pipes 23. The delivery pipe 21 can be connected to the downstream of the air-powder mixing bin 3 for conveying air-powder. It should be noted that the air-powder mentioned in the present disclosure refers to coal powder mixed with air. A plurality of adjustment components 22 can be sequentially connected to the delivery pipe 21 along the delivery direction to adjust the pipeline opening of the delivery pipe 21 respectively, and can realize the cutoff or conduction of various parts of the delivery pipe 21 in the delivery direction, so as to effectively control the flow of air-powder. A plurality of feed pipes 23 can be connected in parallel upstream of the boiler body 1, and a plurality of feed pipes 23 can be connected one by one downstream of a plurality of regulating components 22, that is, each feed pipe 23 corresponds to an regulating component 22, and each feed pipe 23 is connected to the boiler body 1, respectively. Such a design enables each regulating component 22 to independently control the amount of air and powder flowing to the boiler body 1, ensuring that the boiler body 1 can obtain appropriate material supply under different working conditions. When the boiler body 1 is running at low load, the amount of air and powder delivered by the feed pipe 21 can be reduced or cut off by the regulating component 22, and the coal powder can be passed to a single feed pipe 23, so that the amount of air and powder delivered can be more easily adjusted and controlled, thereby facilitating more convenient maintenance of combustion stability. It can be understood that the low-load operation in the boiler body 1 in the present disclosure refers to the operating state of the boiler body 1 under the condition of low load demand. For example, the corresponding load when the boiler body 1 is running at full load is k1, and the corresponding load when running at low load can be a load less than 0.3k1.

[0022] Through the above technical solution, multiple adjustment components 22 are connected to the feed pipe 21, and multiple distribution pipes 23 are arranged in parallel between the boiler body 1 and the feed pipe 21, so that each adjustment component 22 can independently control the amount of pulverized coal flowing to the boiler body 1, ensuring that the boiler body 1 can obtain a suitable supply of pulverized coal under different operating conditions. When the boiler body 1 is operating at low load, the air powder entering the feed pipe 21 cannot flow to the downstream feed pipe 21, thereby reducing the amount of pulverized coal entering the distribution pipe 23, thereby optimizing the combustion efficiency of the boiler body 1 and the stability of the combustion process, and reducing the risk of failure of the boiler body 1.

[0023] Correspondingly, the present disclosure also provides a method for dividing materials of a boiler, which includes step S200, introducing coal powder into the air-powder mixing bin 3, so that the air carries the coal powder into the coal powder pipe feed pipe 21. In this step, the air carrying the coal powder can be guided by the induced draft fan to pass through the guide grid 32 mentioned below and then introduced into the feed pipe 21, thereby reducing the circulation resistance of the air and the powder and improving the circulation effect of the air and the powder.

[0024] Reference Figure 2-Figure 4 The peripheral wall of the feed pipe 21 is provided with two arc-shaped through holes 211 symmetrically arranged in the radial direction. The adjustment component 22 may include two baffles 221. The two baffles 221 are used to move toward or away from each other to reciprocate through the corresponding through holes 211, thereby adjusting the opening of the feed pipe 21. When the two baffles 221 are engaged with each other, the feed pipe 21 is cut off, so that the wind powder entering the feed pipe 21 cannot continue to flow downstream. Figure 4 As shown, in the embodiment provided by the present disclosure, the outer contours of the two baffles 221 can be respectively constructed as a fan shape, and can be configured to be jointly constructed as a circular plate structure with an outer diameter matching the inner diameter of the feed pipe 21 when engaged with each other. Not only can it better adapt to the shape of the feed pipe 21 during movement, reducing space waste, but it can also effectively improve the cut-off effect of the feed pipe 21, and at the same time can effectively shorten the coal powder transportation time, improve the combustion stability and coal powder concentration, and avoid the flame in the boiler body 1 from being extinguished.

[0025] Reference Figure 2-Figure 4, the adjustment component 22 may also include a bidirectional screw rod 223, a drive motor 224 and two sliders 222. The bidirectional screw rod 223 may extend radially along the feed pipe 21, and the output end of the drive motor 224 may be connected to the bidirectional screw rod 223 to drive the bidirectional screw rod 223 to rotate around its own axis. The two sliders 222 may be respectively provided with threaded holes for the bidirectional screw rod 223 to pass through, so as to be respectively threadedly connected to the two ends of the bidirectional screw rod 223, thereby ensuring the precise matching of the two sliders 222 and the bidirectional screw rod 223. When the bidirectional screw rod 223 rotates in different directions, the two sliders 222 may respectively drive the two baffles 221 to move in the direction of approaching or moving away from each other, thereby realizing the precise adjustment of the two baffles 221, so as to be able to flexibly adapt to different work requirements. The two sliders 222 are fixedly connected to the two baffles 221 in a one-to-one correspondence. According to the embodiment provided by the present disclosure, when the driving motor 224 outputs a forward driving force, the bidirectional screw rod 223 can rotate in the clockwise direction, and the two sliders 222 can move in the direction of approaching each other to drive the two baffles 221 to move in the direction of approaching each other, and then the two baffles 221 respectively pass through the through holes 211 and dock in the feed pipe 21 to achieve the cutoff of the feed pipe 21; when the driving motor 224 outputs a reverse driving force, the bidirectional screw rod 223 can rotate in the counterclockwise direction, and the two sliders 222 can move in the direction of moving away from each other to drive the two baffles 221 to move in the direction of moving away from each other, and then the two baffles 221 respectively pass through the through holes 211 and move out of the feed pipe 21 and separate, so that the feed pipe 21 can be conductive. With such a design, the adjustment efficiency of the baffle 221 is effectively improved by converting the rotational motion of the driving motor 224 and the bidirectional screw rod 223 into the linear motion of the slider 222.

[0026] Accordingly, the boiler material distribution method provided by the present disclosure further includes step S300 implemented after step S200: when the boiler body 1 is running at low load, the partial sections of the feed pipe 21 that are not needed are closed by the adjustment component 22. In this step, the motor 224 can be driven to drive the bidirectional screw 223 to rotate, the bidirectional screw 223 drives the two sliders 222 to move in a direction close to each other, and the sliders 222 drive the two baffles 221 to penetrate the through holes 211 and enter the feed pipe 21, thereby sealing the inside of the feed pipe 21, closing the partial sections of the feed pipe 21 that are not needed, and allowing the coal powder to enter the single distribution pipe 23.

[0027] Reference Figure 1-Figure 4The adjustment assembly 22 may further include a mounting plate 225, which may be sleeved on the outer wall of the feed pipe 21. In the embodiment provided by the present disclosure, a mounting hole 225a may be provided on the mounting plate 225, and the inner diameter of the mounting hole 225a may match the outer diameter of the feed pipe 21, thereby improving the connection strength between the mounting plate 225 and the feed pipe 21 and ensuring the stability of the mounting plate 225 sleeved on the feed pipe 21. The mounting plate 225 may be constructed to be hollow inside, and the slider 222 and the bidirectional screw rod 223 may be accommodated in the mounting plate 225, such as Figure 3 As shown, the inner area of ​​the mounting plate 225 other than the mounting hole 225a can be formed into a receiving groove 225b, which can effectively isolate the slider 222 and the bidirectional screw rod 223 from the outside to avoid contact with the outside, thereby reducing the risk of other external components accidentally touching the slider 222 and the bidirectional screw rod 223, so as to effectively improve the safety of operation. In the embodiment provided by the present disclosure, when there is no need to cut off or reduce the opening of the conveying pipe 21, the two baffles 221 can be retracted in the receiving groove 225b mentioned above, so as to avoid affecting the normal transportation of coal, and at the same time, provide a safer accommodation environment for the two baffles 221 through the receiving groove 225b.

[0028] Further, refer to Figure 3 When the mounting plate 225 is constructed as an internal hollow structure, a rotation hole 225c may be opened on the side wall of the mounting plate 225, and the drive motor 224 may be arranged on the outside of the mounting plate 225, so as to effectively save the internal space of the mounting plate 225, and at the same time help to improve the heat dissipation performance of the drive motor 224, and avoid the phenomenon that the drive motor 224 is installed inside the mounting plate 225 and overheats and affects its normal operation, thereby extending the service life of the drive motor 224 and ensuring the driving effect of the bidirectional screw rod 223. The output shaft of the drive motor 224 can pass through the rotation hole 225c and dock with the bidirectional screw rod 223 to realize direct drive of the bidirectional screw rod 223 and improve the driving efficiency.

[0029] Reference Figure 3 and Figure 4 The adjusting component 22 may further include a connecting rod 226, which may be fixedly connected to the slider 222 and the baffle 221. The connecting rod 226 is constructed as an L-shaped structure. Such a design may effectively utilize space in a narrow environment and may better adapt to surrounding structures. At the same time, it may provide better support and stability for the baffle 221, thereby reducing the risk of shaking of the baffle 221 during operation, thereby improving the reliability of the material distribution device and ensuring the blocking effect of the baffle 221 on the coal.

[0030] Reference Figure 1The material distribution device may further include a one-way valve 24 disposed on the material distribution pipe 23. A one-way valve 24 is correspondingly disposed on each of the plurality of material distribution pipes 23 to prevent high-temperature gas or burning coal powder from flowing back into the material delivery pipe 21, thereby effectively avoiding deflagration or explosion in the material delivery pipe 21, which is beneficial to improving the safety and reliability of the processing environment.

[0031] Reference Figure 1 The inner diameter of the feed pipe 21 can be gradually increased along the feed direction, so that the position of the feed pipe 21 gradually approaching the downstream outlet can generate a pressure difference with the inlet of the feed pipe 21, thereby effectively preventing the coal powder from arching at the inlet of the feed pipe 21.

[0032] Further, according to the embodiment provided by the present disclosure, an anti-wear layer 213 is provided inside the feed pipe 21. By providing the anti-wear layer 213, the scouring and wear of the inner wall of the feed pipe 21 by the coal powder can be buffered, thereby improving the mechanical service life of the device. An explosion-proof valve 212 can be provided outside the feed pipe 21. The explosion-proof valve 212 can be used as a pressure relief device for the feed pipe 21, reducing the explosion risk of the feed pipe 21, which is conducive to improving the safety of the production environment.

[0033] Reference Figure 1 and Figure 2 The second aspect of the present disclosure also provides a boiler. Along the conveying direction of the pulverized coal, the boiler may include a pulverized coal bin 4, an air-powder mixing bin 3, a feeder 2 and a boiler body 1 which are sequentially connected. The feeder 2 is the feeder mentioned above, and the boiler has all the beneficial effects of the feeder 2 provided by the present disclosure, which will not be repeated here. The air-powder mixing bin 3 is arranged upstream of the feeder 2 and can be used to mix compressed air and pulverized coal, and convey the air-powder to the feeder 2. The side wall of the air-powder mixing bin 3 may be provided with air holes 34 to allow compressed air to be introduced into the air-powder mixing bin 3 through the air holes 34, and a feeder hole 33 may be provided on the top surface of the air-powder mixing bin 3. The pulverized coal bin 4 can be used to provide pulverized coal. The bottom end of the pulverized coal bin 4 is connected with a feeder pipe 41, and the feeder pipe 41 and the feeder hole 33 can be fixedly sleeved together to output the pulverized coal in the pulverized coal bin 4 to the air-powder mixing bin 3.

[0034] Correspondingly, the boiler material distribution method provided by the present invention also includes step S100 implemented before step S200: feeding the raw coal into a coal mill (not shown in the figure), controlling the operating conditions of the coal mill, grinding the raw coal particles into coal powder with a particle size of less than 200μm, and transporting it to the coal powder bin 4, which not only facilitates the transportation of coal powder, but also enables the coal powder to be more fully burned in the boiler body 1, thereby improving the utilization rate of the coal powder.

[0035] Reference Figure 1A burner 11 may be provided on the side wall of the boiler body 1, and a plurality of ignition heads 12 accommodated in the boiler body 1 may be provided on the side of the burner 11 away from the material distribution device 2, so as to ensure the combustion effect of the boiler body 1. A plurality of connection holes 13 may be provided on the side of the burner 11 close to the material distribution device 2, and the number of the plurality of connection holes 13 may match the number of the material distribution pipes 23, and the ends of the plurality of material distribution pipes 23 close to the burner 11 are respectively connected to the connection holes 13 in a one-to-one correspondence, so as to improve the conveying accuracy of the air powder.

[0036] Accordingly, the boiler material distribution method provided in the present disclosure also includes the following step S500 implemented after step S400: the coal powder enters the burner 11 under pneumatic conveying, is ignited by the burner 11, and the amount of coal powder and gas is adjusted to maintain the temperature in the boiler body 1 at 800-1100°C.

[0037] Reference Figure 1 In the embodiment provided in the present disclosure, the air-powder mixing bin 3 can be arranged at a lateral interval from the boiler body 1, and the height of the air-powder mixing bin 3 in the vertical direction can be higher than the boiler body 1 so that the coal powder can automatically move downward by its own gravity to a certain extent, so as to reduce the difficulty of conveying the coal powder. In order to improve the connection strength between the air-powder mixing bin 3 and the boiler body 1, the boiler can also include a support rod 7 fixedly connected between the air-powder mixing bin 3 and the boiler body 1. The support rod 7 can be constructed as an inverted L-shaped structure, and the bending angle of the L-shaped structure can be 90°, thereby improving the support effect of the support rod 7. In other embodiments, the support rod 7 can also be constructed as a straight rod, which can be connected between the air-powder mixing bin 3 and the boiler body 1 at an angle to the horizontal ground. The present disclosure does not limit the specific structure of the support rod 7, as long as it can meet the support strength and connection strength.

[0038] Reference Figure 1 The boiler may further include a controller 61 and a powder flowmeter 62. The controller 61 is fixedly installed on one side of the boiler body 1, and the controller 61 is electrically connected to the driving motor 224 mentioned above. A powder flowmeter 62 is arranged outside the feed pipe 21, and the controller 61 is electrically connected to the powder flowmeter 62. A control valve 63 is arranged outside the feed pipe 21, and the control valve 63 is electrically connected to the controller 61. By setting the controller 61, when the boiler body 1 is in low-load operation, the powder flowmeter 62 is used to measure the concentration of pulverized coal transported to the feed pipe 21. When the boiler body 1 can be operated normally and the pulverized coal concentration is stable during combustion, the control valve 63 is closed by the controller 61.

[0039] Correspondingly, the boiler material distribution method provided in the present invention also includes step S400 implemented after step S300 mentioned above: coal powder enters the feed pipe 21, the coal powder amount is calculated by the powder flow meter 62, and the coal powder amount is fed back to the controller 61, and the controller 61 controls the entering amount of coal powder by adjusting the control valve 63.

[0040] like Figure 5 As shown, a guide grating ring 31 with an outer diameter matching the inner diameter of the air-powder mixing bin 3 can be fixedly installed on the inner circumferential wall of the guide grating ring 31, and a plurality of guide grating plates 32 can be fixedly installed on the inner circumferential wall of the guide grating ring 31, and the plurality of guide grating plates 32 are parallel to each other and spaced apart in a direction perpendicular to the feeding direction, so that the air-powder can be divided into a plurality of parallel flow paths during the process of being transported from the air-powder mixing bin 3 to the downstream, thereby reducing the circulation resistance of the air-powder.

[0041] According to the three aspects of the present disclosure, a material distribution method for the above-mentioned boiler is also provided. The material distribution method is applied to the boiler mentioned in the present disclosure and has all the beneficial effects of the boiler, which will not be described in detail here.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A material distribution device for a boiler, characterized in that: Used to be arranged between the air-powder mixing bin and the boiler body, the material distribution device includes: A material conveying pipe connected to the downstream of the air-powder mixing bin; A plurality of adjustment components are sequentially arranged on the material conveying pipe along the material conveying direction, and are used to adjust the pipe opening of the material conveying pipe respectively; and A plurality of material distribution pipes are connected to the upstream of the boiler body, and the plurality of material distribution pipes are connected and arranged one by one to the downstream of the plurality of regulating components.

2. The material distribution device according to claim 1, characterized in that: Two radially symmetrical arc-shaped through holes are provided on the peripheral wall of the feed pipe, and the adjustment assembly includes two symmetrically arranged baffles, each passing through the corresponding through holes. The two baffles are used to move toward or away from each other, and the two baffles are configured to be able to jointly construct a circular plate structure with an outer diameter matching the inner diameter of the feed pipe when engaged with each other.

3. The material distribution device according to claim 2, characterized in that: The adjustment component also includes: A bidirectional screw rod extending in the radial direction of the feed pipe; A driving motor drives the bidirectional screw to rotate; and The two sliding blocks are respectively screwed on the two ends of the bidirectional screw rod and fixedly connected with the two baffles in a one-to-one correspondence.

4. The material distribution device according to claim 3, characterized in that: The adjustment assembly also includes a mounting plate sleeved on the outer wall of the feed pipe. The mounting plate is constructed to be hollow inside, and the slider and the bidirectional screw are accommodated in the mounting plate.

5. The material distribution device according to claim 3, characterized in that: The adjustment assembly also includes a connecting rod fixedly connected between the sliding block and the baffle, and the connecting rod is constructed as an L-shaped structure.

6. The material distribution device according to claim 1, characterized in that: The material distribution device also includes a one-way valve arranged on the material distribution pipe.

7. The material distribution device according to claim 1 or 2, characterized in that: The inner diameter of the material conveying pipe gradually increases along the material conveying direction.

8. A boiler, characterized in that: include: The boiler body has a burner arranged on the side wall; A material distribution device, arranged upstream of the burner, wherein the material distribution device is a material distribution device according to any one of claims 1 to 7; An air-powder mixing bin is arranged upstream of the material distribution device and is used to mix compressed air and coal powder and output the air-powder to the material distribution device; as well as The pulverized coal bin is arranged upstream of the air-powder mixing bin and is used for providing pulverized coal.

9. The boiler according to claim 8, characterized in that A guide grating ring with an outer diameter matching the inner diameter of the air-powder mixing bin is fixedly installed on the inner circumferential wall of the air-powder mixing bin, and a plurality of guide grating plates are fixedly installed on the inner circumferential wall of the guide grating ring. The plurality of guide grating plates are parallel to each other and spaced apart along a direction perpendicular to the feeding direction.

10. A method for distributing materials in a boiler, characterized in that: The material distribution method is applied to the boiler according to claim 8 or 9, and the material distribution method comprises: Passing the pulverized coal into the air-powder mixing bin, so that the air carries the pulverized coal into the pulverized coal conveying pipe; and When the boiler body is running at a low load, the regulating assembly is used to close some sections of the feed pipe that are not needed.

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