Pulverized coal supply device

Abstract

The invention provides a pulverized coal supply device which comprises a supply tank and a supply pipe, the supply tank is provided with a supply cavity, a feeding port, an air inlet, a plurality of first communication ports and a plurality of second communication ports, the feeding port, the air inlet, the first communication ports and the second communication ports are communicated with the supply cavity, the feeding port is located in the cavity top face of the supply cavity, and the air inlet is located in the cavity bottom face of the supply cavity; in the direction from the air inlet to the feeding port, the supply cavity is provided with a first cavity section and a second cavity section which communicate with each other, and the multiple first communicating ports are all located in the cavity wall face of the first cavity section; the first end of the feeding pipe penetrates through the second communication opening and extends into the second cavity section, and the second end of the feeding pipe is located outside the feeding cavity to form a feeding opening so that pulverized coal can be fed through the feeding opening. The problems that in the prior art, the bridging phenomenon of pulverized coal in the feeding tank is serious, and long-period normal operation of the gasification furnace cannot be guaranteed are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulverized coal supply equipment, and in particular to a pulverized coal supply device. Background Art

[0002] In the prior art, the pulverized coal entering the gasifier is fluidized to achieve continuous supply of uniform pulverized coal. Since the flow of pulverized coal requires high-pressure inert gas as a dense phase carrier gas, one end of a feed pipeline for conveying pulverized coal is usually extended into the feed tank of the existing gasifier, and then extended into a position in the feed tank at a relatively small distance from the bottom of the fluidizing disk, and the feed pipeline is then fixed by a supporting structure. During the feeding process of the feed tank, the feed pipeline located in the feed tank and close to the fluidizing disk is very easy to break, causing the pulverized coal to easily form bridges at the position of the supporting structure, resulting in frequent fluctuations in the pulverized coal supply in the gasifier, resulting in a large combustion wave in the gasifier, incomplete combustion, uneven slagging in the gasifier, and large fluctuations in important parameters such as the oxygen-coal ratio, methane, and heat loss, which can easily cause the pulverized coal supply system to shut down.

[0003] Since the feed tank is conical, the end of the feed pipeline extending into the feed tank is close to the fluidizing plate at the bottom thereof, and an additional supporting structure is required to support the feed pipeline. As a result, the layout of the feed pipeline and the supporting structure is relatively compact and dense in the relatively narrow space at the bottom of the feed tank, resulting in serious bridging of the coal powder in the feed tank, which cannot ensure the long-term normal operation of the gasifier. Summary of the invention

[0004] The main purpose of the present invention is to provide a pulverized coal supply device to solve the problem in the prior art that the bridging phenomenon of pulverized coal in a feed tank is relatively serious and the long-term normal operation of a gasifier cannot be ensured.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a coal powder supply device, including a supply tank and a supply pipe, wherein the supply tank has a supply chamber and an inlet, an air inlet, a plurality of first connecting ports, and a second connecting port connected to the supply chamber, the inlet is located at the top surface of the supply chamber, and the air inlet is located at the bottom surface of the supply chamber; wherein in the direction from the air inlet to the inlet, the supply chamber has a first cavity section and a second cavity section that are connected, and the plurality of first connecting ports are all located on the cavity wall surface of the first cavity section; the first end of the supply pipe passes through the second connecting port and extends into the second cavity section, and the second end of the supply pipe is located outside the supply chamber to form a supply port, for supplying coal powder through the supply port.

[0006] Furthermore, the included angle between the feed pipe and the cavity wall surface of the second cavity section is A, wherein 20°≤A≤60°.

[0007] Furthermore, the length of the feeding tube extending into the feeding cavity is L, wherein 0cm≤L≤30cm.

[0008] Furthermore, a filter screen is provided at least at the end surface of the first end of the feed pipe located in the feed cavity.

[0009] Furthermore, the filter screen is connected to the end of the first end of the feed pipe by welding.

[0010] Furthermore, there are multiple second connecting ports, and the multiple second connecting ports are arranged at circumferential intervals around the second cavity segment; there are multiple supply pipes, and the multiple supply pipes correspond one-to-one to the multiple second connecting ports, and the first ends of each supply pipe extending into the supply cavity are all converged toward the geometric center of the supply tank, and the second ends of each supply pipe located outside the supply cavity are all dispersed away from the geometric center of the supply tank.

[0011] Furthermore, the feed pipe includes a first pipe section and a second pipe section connected to each other, wherein the diameter of the first pipe section is smaller than the diameter of the second pipe section, and the first pipe section is located at the second cavity section, part of the second pipe section is located in the second cavity section, and another part of the second pipe section is located outside the supply cavity.

[0012] Furthermore, the pulverized coal supply device has multiple groups of first connecting port groups, which are arranged at axial intervals along the supply tank, one group of first connecting port groups includes multiple first connecting ports, and the multiple first connecting ports in the same group are arranged at circumferential intervals around the first cavity segment; the pulverized coal supply device also includes multiple groups of exhaust structures, which correspond one-to-one to the multiple groups of first connecting ports, and an exhaust structure is arranged at each first connecting port.

[0013] Furthermore, the pulverized coal supply device has multiple groups of first connecting port groups, and the multiple groups of first connecting port groups are arranged at axial intervals along the supply tank. One group of first connecting port groups includes multiple first connecting ports, and the multiple first connecting ports in the same group are arranged at circumferential intervals around the first cavity section; among the multiple groups of first connecting port groups, at least at least one first connecting port in at least the bottom group of first connecting port groups is provided with a discharge pipe, and the discharge pipe is used to discharge excess pulverized coal in the supply cavity after the supply pipe completes the feeding operation; the pulverized coal supply device also includes multiple exhaust structures, and the number of the remaining first connecting ports except those provided with the discharge pipe is equal to the number of the exhaust structures, so that an exhaust structure is provided at each first connecting port.

[0014] Furthermore, at least the exhaust structure located at the bottom of the multiple exhaust structures is provided with a regulating valve, so that the amount of fluidizing gas in the supply chamber can be adjusted through the regulating valve.

[0015] Applying the technical solution of the present invention, a coal powder supply device is provided, comprising a supply tank and a supply pipe, wherein the supply tank has a supply chamber and a feed port, an air inlet, a plurality of first connecting ports, and a second connecting port connected to the supply chamber, the feed port is located at the top surface of the supply chamber, and the air inlet is located at the bottom surface of the supply chamber; wherein in the direction from the air inlet to the feed port, the supply chamber has a first chamber section and a second chamber section that are connected, and the plurality of first connecting ports are all located on the chamber wall surface of the first chamber section; the first end of the supply pipe passes through the second connecting port and extends into the second chamber section, and the second end of the supply pipe is located outside the supply chamber to form a supply port, for supplying coal powder through the supply port.

[0016] By extending the first end of the feed pipe through the second connecting port and into the second cavity section, the second end of the feed pipe is located outside the supply cavity to form a feed port for supplying pulverized coal through the feed port. In this way, it is avoided that there is a need to set up more additional support structures at the position where the feed pipe extends into the supply cavity due to proximity to the fluidizing disk, thereby ensuring the gasification uniformity and gasification stability of the pulverized coal at the position where the first end of the feed pipe extends through the second connecting port and into the second cavity section. Since there is no additional support structure, the supply cavity layout will not be compact, and the bridging phenomenon of the pulverized coal in the supply cavity can be effectively alleviated, thereby ensuring the long-term normal operation of the gasifier and further ensuring the supply reliability of the pulverized coal supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of a pulverized coal supply device according to an optional embodiment of the present invention is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Supply tank; 11. Supply chamber; 111. First chamber section; 112. Second chamber section; 12. Feed inlet; 13. Air inlet;

[0021] 20. Feed pipe; 21. First pipe section; 22. Second pipe section;

[0022] 30. Discharge pipe; 40. Exhaust structure; 50. Fluidizing plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to solve the problem in the prior art that the bridging phenomenon of coal powder in the feeding tank is serious and the long-term normal operation of the gasifier cannot be ensured, the present invention provides a coal powder supply device.

[0025] like Figure 1 As shown, the coal powder supply device includes a supply tank 10 and a supply pipe 20, wherein the supply tank 10 has a supply chamber 11 and an inlet 12, an air inlet 13, a plurality of first connecting ports, and a second connecting port connected to the supply chamber 11, the inlet 12 is located at the top surface of the supply chamber 11, and the air inlet 13 is located at the bottom surface of the supply chamber 11; wherein, in the direction from the air inlet 13 to the inlet 12, the supply chamber 11 has a first chamber section 111 and a second chamber section 112 that are connected, and the plurality of first connecting ports are all located on the chamber wall surface of the first chamber section 111; the first end of the supply pipe 20 passes through the second connecting port and extends into the second chamber section 112, and the second end of the supply pipe 20 is located outside the supply chamber 11 to form a supply port, so as to supply coal powder through the supply port.

[0026] By extending the first end of the feed pipe 20 through the second connecting port into the second cavity section 112, the second end of the feed pipe 20 is located outside the supply cavity 11 to form a feed port for supplying pulverized coal through the feed port. In this way, it is avoided that there is a need to set up more additional support structures at the position where the feed pipe 20 extends into the supply cavity 11 due to proximity to the fluidizing disk, thereby ensuring the gasification uniformity and gasification stability of the pulverized coal at the position where the first end of the feed pipe 20 extends through the second connecting port into the second cavity section 112. Since there is no additional support structure, the supply cavity 11 will not be compactly arranged, thereby ensuring that the bridging phenomenon of the pulverized coal in the supply cavity 11 can be effectively alleviated, thereby ensuring the long-term normal operation of the gasifier, and further ensuring the supply reliability of the pulverized coal supply device.

[0027] like Figure 1 As shown, the air inlet 13 is arranged close to the fluidizing disk 50 .

[0028] It should be noted that, in the present application, the angle between the feed pipe 20 and the cavity wall surface of the second cavity section 112 is A, wherein 20°≤A≤60°. In this way, by reasonably optimizing the angle A between the feed pipe 20 and the cavity wall surface of the second cavity section 112, it is possible to effectively supply relatively uniform and stable pulverized coal at the second cavity section 112 after ensuring that the first end of the feed pipe 20 passes through the second connecting port and extends into the second cavity section 112.

[0029] Optionally, the angle between the feed pipe 20 and the cavity wall surface of the second cavity section 112 is 45°.

[0030] It should be noted that, in the present application, the length of the feed pipe 20 extending into the supply chamber 11 is L, wherein 0 cm ≤ L ≤ 30 cm. Thus, by reasonably optimizing the length L of the feed pipe 20 extending into the supply chamber 11, it is possible to effectively supply relatively uniform and stable pulverized coal at the second chamber section 112 after ensuring that the first end of the feed pipe 20 passes through the second connecting port and extends into the second chamber section 112.

[0031] Preferably, the length L of the feeding tube 20 extending into the feeding chamber 11 is 10 cm.

[0032] It should be noted that, in the present application, a filter screen is provided at least at the end surface of the first end of the feed pipe 20 located in the feed chamber 11. Thus, the provision of the filter screen further filters the coal powder, ensuring that the supplied coal powder can meet the production requirements as much as possible.

[0033] It should be noted that, in the present application, the filter screen is welded to the end of the first end of the feed pipe 20. In this way, the connection reliability between the filter screen and the end of the first end of the feed pipe 20 is high.

[0034] It should be noted that, in the present application, there are multiple second connecting ports, and the multiple second connecting ports are arranged at intervals around the circumference of the second cavity section 112; there are multiple feeding pipes 20, and the multiple feeding pipes 20 correspond to the multiple second connecting ports one by one, and the first ends of each feeding pipe 20 extending into the supply cavity 11 are all arranged to converge toward the geometric center of the supply tank 10, and the second ends of each feeding pipe 20 located outside the supply cavity 11 are all arranged to disperse away from the geometric center of the supply tank 10. In this way, by providing multiple feeding pipes 20, and the first ends of each feeding pipe 20 extending into the supply cavity 11 are all arranged to converge toward the geometric center of the supply tank 10, and the second ends of each feeding pipe 20 located outside the supply cavity 11 are all arranged to disperse away from the geometric center of the supply tank 10, it is ensured that the first end of the feeding pipe 20 can effectively supply relatively uniform and stable coal powder at the second cavity section 112 after passing through the second connecting port and extending into the second cavity section 112.

[0035] like Figure 1As shown, the feed pipe 20 includes a first pipe section 21 and a second pipe section 22 connected to each other, wherein the diameter of the first pipe section 21 is smaller than that of the second pipe section 22, and the first pipe section 21 is located at the second cavity section 112, a portion of the second pipe section 22 is located in the second cavity section 112, and another portion of the second pipe section 22 is located outside the supply cavity 11. In this way, by setting the feed pipe 20 to include a first pipe section 21 and a second pipe section 22 connected to each other, it is ensured that the uniform and stable coal powder in the second cavity section 112 can be dispersed to each feed pipe 20 as evenly as possible.

[0036] It should be noted that, in an embodiment of the present application not shown in the figure, the pulverized coal supply device has multiple groups of first communication ports, which are arranged at intervals along the axial direction of the supply tank 10, and one group of first communication ports includes multiple first communication ports, and the multiple first communication ports in the same group are arranged at intervals around the circumference of the first cavity section 111; the pulverized coal supply device also includes multiple groups of exhaust structures 40, which correspond to the multiple groups of first communication ports one by one, and each first communication port is provided with an exhaust structure 40. In this way, it is conducive to ensuring the effective discharge of the gas in the supply cavity 11.

[0037] like Figure 1 As shown, considering that the first end of the feed pipe 20 extends into the second cavity section 112 through the second connecting port, there is a situation that the coal powder cannot be completely returned after the coal powder is supplied, the coal powder supply device has multiple groups of first connecting port groups, and the multiple groups of first connecting port groups are arranged at intervals along the axial direction of the supply tank 10. One group of first connecting port groups includes multiple first connecting ports, and the multiple first connecting ports in the same group are arranged at intervals around the circumference of the first cavity section 111; among the multiple groups of first connecting port groups, at least at least one first connecting port in the group of first connecting port groups located at the bottom is provided with a discharge pipe 30, and the discharge pipe 30 is used to discharge the excess coal powder in the supply cavity 11 after the feed pipe 20 completes the feeding operation; the coal powder supply device also includes multiple exhaust structures 40, and the number of the remaining first connecting ports except the one provided with the discharge pipe 30 is equal to the number of the exhaust structures 40, so that each first connecting port is provided with an exhaust structure 40. In this way, the provision of the discharge pipe 30 is conducive to the timely discharge of the coal powder that cannot be completely returned.

[0038] It should be noted that, in the present application, the number of the exhaust structures 40 is greater than or equal to the number of the feed pipes 20 , and the plurality of exhaust structures 40 are evenly distributed, and the plurality of feed pipes 20 are evenly distributed.

[0039] It should be noted that in the present application, in order to form a steady-state region of the optimal fluidized state and allow the coal powder to enter the feed pipe 20 evenly, the air intake of the fluidizing plate 50 is controlled at 600-2000Nm3 / h, preferably 1450Nm3 / h, and this state has the least interference factor on the feed pipe 20. When coal powder bridging occurs, the exhaust structure 40 is opened in sequence to loosen the coal powder, and finally opens at the same time, and closes after normal.

[0040] It should be noted that, in the present application, at least the exhaust structure 40 located at the bottom of the multiple exhaust structures 40 is provided with a regulating valve, so as to adjust the fluidizing gas volume in the supply chamber 11 through the regulating valve. In this way, the setting of the regulating valve is conducive to adjusting the fluidizing gas volume in the supply chamber 11 through the regulating valve, ensuring that the discharged return coal is clean and thorough, the fluidizing gas volume is uniform during the operation of the device, and the fluidization state of the coal powder is normal.

[0041] By applying the technical solution of the present invention, a pulverized coal supply device is provided, comprising a supply tank 10 and a supply pipe 20, wherein the supply tank 10 has a supply chamber 11 and an inlet 12, an air inlet 13, a plurality of first connecting ports, and a second connecting port connected to the supply chamber 11, the inlet 12 is located at the top surface of the supply chamber 11, and the air inlet 13 is located at the bottom surface of the supply chamber 11; wherein in the direction from the air inlet 13 to the inlet 12, the supply chamber 11 has a first chamber section 111 and a second chamber section 112 that are connected, and the plurality of first connecting ports are all located on the chamber wall surface of the first chamber section 111; the first end of the supply pipe 20 passes through the second connecting port and extends into the second chamber section 112, and the second end of the supply pipe 20 is located outside the supply chamber 11 to form a supply port, so as to supply pulverized coal through the supply port.

[0042] By extending the first end of the feed pipe 20 through the second connecting port into the second cavity section 112, the second end of the feed pipe 20 is located outside the supply cavity 11 to form a feed port for supplying pulverized coal through the feed port. In this way, it is avoided that there is a need to set up more additional support structures at the position where the feed pipe 20 extends into the supply cavity 11 due to proximity to the fluidizing disk, thereby ensuring the gasification uniformity and gasification stability of the pulverized coal at the position where the first end of the feed pipe 20 extends through the second connecting port into the second cavity section 112. Since there is no additional support structure, the supply cavity 11 will not be compactly arranged, thereby ensuring that the bridging phenomenon of the pulverized coal in the supply cavity 11 can be effectively alleviated, thereby ensuring the long-term normal operation of the gasifier, and further ensuring the supply reliability of the pulverized coal supply device.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pulverized coal supply device, characterized in that: include: A supply tank (10), the supply tank (10) comprising a supply chamber (11), and a feed port (12), an air inlet (13), a plurality of first communication ports, and a second communication port connected to the supply chamber (11), the feed port (12) being located at the top surface of the supply chamber (11), and the air inlet (13) being located at the bottom surface of the supply chamber (11); Wherein, in the direction from the air inlet (13) to the feed port (12), the supply chamber (11) has a first chamber section (111) and a second chamber section (112) which are connected, and the plurality of first communication ports are all located on the chamber wall surface of the first chamber section (111); A feed pipe (20), wherein the first end of the feed pipe (20) passes through the second connecting port and extends into the second cavity section (112), and the second end of the feed pipe (20) is located outside the supply cavity (11) to form a feed port for supplying pulverized coal through the feed port.

2. The pulverized coal supply device according to claim 1, characterized in that: The included angle between the feed pipe (20) and the cavity wall surface of the second cavity section (112) is A, wherein 20°≤A≤60°.

3. The pulverized coal supply device according to claim 1, characterized in that: The length of the feed pipe (20) extending into the feed chamber (11) is L, wherein 0 cm ≤ L ≤ 30 cm.

4. The pulverized coal supply device according to claim 1, characterized in that: A filter screen is provided at the end surface of at least the first end of the feed pipe (20) located in the feed chamber (11).

5. The pulverized coal supply device according to claim 4, characterized in that: The filter screen is welded to the end of the first end of the feed pipe (20).

6. The pulverized coal supply device according to claim 1, characterized in that: There are a plurality of second communication ports, and the plurality of second communication ports are arranged at intervals around the circumference of the second cavity section (112); There are a plurality of the feed pipes (20), and the plurality of the feed pipes (20) correspond one-to-one to the plurality of the second connecting ports. The first ends of the feed pipes (20) extending into the supply cavity (11) are all arranged to converge toward the geometric center of the supply tank (10), and the second ends of the feed pipes (20) located outside the supply cavity (11) are all arranged to disperse away from the geometric center of the supply tank (10).

7. The pulverized coal supply device according to claim 1, characterized in that: The feed pipe (20) comprises a first pipe section (21) and a second pipe section (22) which are connected to each other, wherein the diameter of the first pipe section (21) is smaller than the diameter of the second pipe section (22), and the first pipe section (21) is located at the second cavity section (112), a portion of the second pipe section (22) is located in the second cavity section (112), and another portion of the second pipe section (22) is located outside the supply cavity (11).

8. The pulverized coal supply device according to claim 1, characterized in that: The pulverized coal supply device comprises a plurality of first communication port groups, the plurality of first communication port groups are arranged at intervals along the axial direction of the supply tank (10), one group of the first communication port groups comprises a plurality of the first communication ports, and the plurality of the first communication ports in the same group are arranged at intervals around the circumference of the first cavity section (111); The pulverized coal supply device further includes a plurality of exhaust structures, the plurality of exhaust structures correspond one-to-one to the plurality of first connecting ports, and one exhaust structure is disposed at each of the first connecting ports.

9. The pulverized coal supply device according to claim 1, characterized in that: The pulverized coal supply device comprises a plurality of first communication port groups, the plurality of first communication port groups are arranged at intervals along the axial direction of the supply tank (10), one group of the first communication port groups comprises a plurality of the first communication ports, and the plurality of the first communication ports in the same group are arranged at intervals around the circumference of the first cavity section (111); Among the plurality of first communication port groups, at least one of the first communication port groups located at the bottom is provided with a discharge pipe (30), and the discharge pipe (30) is used to discharge excess coal powder in the supply chamber (11) after the supply pipe (20) completes the supply operation; The pulverized coal supply device further comprises a plurality of exhaust structures (40), and the number of the first communication ports other than the one provided with the discharge pipe (30) is equal to the number of the exhaust structures (40), so that each of the first communication ports is provided with an exhaust structure (40).

10. The pulverized coal supply device according to claim 9, characterized in that: At least the exhaust structure (40) located at the bottom of the plurality of exhaust structures (40) is provided with a regulating valve so as to adjust the amount of fluidizing gas in the supply chamber (11) through the regulating valve.

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