Circulating fluidization coal-fired boiler

Abstract

The utility model relates to a circulating fluidization coal-fired boiler which comprises a hearth, a coal falling pipe and a first fire coal storage mechanism, the coal falling pipe is obliquely arranged on the hearth, one end of the coal falling pipe is connected with the hearth, and the other end of the coal falling pipe is communicated with the hearth; the first fire coal storage mechanism is arranged at the bottom of the inner wall of the coal drop pipe and used for storing part of fire coal at the bottom of the inner wall of the coal drop pipe, so that the particle fire coal is prevented from directly colliding with the bottom of the coal drop pipe. During operation, fire coal falls into the hearth from the coal falling pipe to be combusted, the first fire coal storage mechanism is arranged at the bottom of the inner wall of the coal falling pipe, and part of the fire coal is stored at the bottom of the inner wall of the coal falling pipe through the first fire coal storage mechanism, so that particle fire coal is prevented from directly colliding with the bottom of the coal falling pipe; the coal particles are in direct contact with part of coal accumulated at the bottom of the coal drop pipe, direct abrasion to the bottom of the coal drop pipe is prevented, the service life of the coal drop pipe is prolonged, coal leakage and pollution to the surrounding environment are prevented, and meanwhile maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler equipment, in particular to a circulating fluidized bed coal-fired boiler. Background Art

[0002] In a circulating fluidized bed coal-fired boiler, the particle size of the coal entering the furnace is 3-10 mm, accounting for more than 50%. The granular coal particles enter the furnace through the coal drop pipe for combustion.

[0003] The existing coal drop pipe is made entirely of stainless steel. When transporting coal to the furnace, the granular coal will collide with the steel plate of the coal drop pipe. Due to long-term continuous cycle operation, the steel plate of the coal drop pipe is worn through, causing coal powder to leak from the coal drop pipe, which not only pollutes the production area environment, but also increases maintenance costs, workload, and is time-consuming and labor-intensive. Summary of the Invention

[0004] To this end, it is necessary to provide a circulating fluidized coal-fired boiler to solve the technical problem that when the coal is transported to the furnace, the granular coal collides with the steel plate of the coal drop pipe. Due to long-term continuous cycle operation, the steel plate of the coal drop pipe is worn through, causing the coal drop pipe to leak coal powder, which not only pollutes the production area environment, but also increases maintenance costs, increases workload, and is time-consuming and labor-intensive.

[0005] To achieve the above-mentioned purpose, the inventor provides a circulating fluidized bed coal-fired boiler, comprising:

[0006] furnace,

[0007] a coal drop pipe, the coal drop pipe being obliquely arranged on the furnace, one end of the coal drop pipe being connected to the furnace, and one end of the coal drop pipe being in communication with the furnace;

[0008] And a first coal storage mechanism, which is arranged at the bottom of the inner wall of the coal drop pipe and is used to accumulate part of the coal at the bottom of the inner wall of the coal drop pipe to avoid direct collision between the granular coal and the bottom of the coal drop pipe.

[0009] As a preferred structure of the present invention, the first coal storage mechanism includes a plurality of first partitions;

[0010] The plurality of first baffles are respectively arranged along the bottom of the inner wall of the coal drop pipe in an interval-arranged manner, and the plurality of first baffles are respectively connected to the bottom of the inner wall of the coal drop pipe;

[0011] The bottoms of the plurality of first baffles are respectively fitted with the bottoms of the inner walls of the coal drop pipes;

[0012] The heights of the plurality of first partitions are all smaller than the aperture of the coal drop pipe.

[0013] As a preferred structure of the present invention, a plurality of the first partitions are arranged obliquely along the bottom of the inner wall of the coal drop pipe.

[0014] As a preferred structure of the present invention, the inclination angle between the first partition and the coal drop pipe is 50-60°.

[0015] As a preferred structure of the present invention, the height of the first partition is 50-70 mm, and the width of the interval between two adjacent first partitions is 50-70 mm.

[0016] As a preferred structure of the present invention, the first partition is in an arc shape.

[0017] As a preferred structure of the present invention, a first crushing protrusion is provided on the top of the first partition, and the first crushing protrusion is used to crush the granular coal.

[0018] As a preferred structure of the present invention, the circulating fluidized coal-fired boiler also includes a second crushing protrusion, which is arranged on the top of the inner wall of the coal drop pipe, and the second crushing protrusion is fixedly connected to the inner wall of the coal drop pipe, and the second crushing protrusion is used to crush the granular coal.

[0019] As a preferred structure of the present invention, the circulating fluidized coal-fired boiler also includes a feed pipe, which is obliquely arranged on the coal drop pipe, one end of the feed pipe is connected to the other end of the coal drop pipe, and the other end of the feed pipe is provided with a feed port, the feed pipe is connected to the coal drop pipe, and the inclination angle of the feed pipe relative to the furnace is greater than the inclination angle of the coal drop pipe relative to the furnace.

[0020] As a preferred structure of the present invention, the circulating fluidized coal-fired boiler further includes a separation mechanism, a material return device and a material return pipe;

[0021] The separation mechanism is connected to the smoke outlet of the furnace, and is used to separate solid particles in the smoke;

[0022] The material returner is arranged below the separation mechanism, the material returner is communicated with the separation mechanism, and the material returner is communicated with the furnace through the material return pipe.

[0023] Different from the existing technology, the beneficial effects of the above technical solution are as follows: in the circulating fluidized bed coal-fired boiler of the present invention, coal falls from the coal drop pipe into the furnace for combustion during operation, wherein a first coal storage mechanism is provided at the bottom of the inner wall of the coal drop pipe. By providing the first coal storage mechanism, part of the coal is accumulated at the bottom of the inner wall of the coal drop pipe to avoid direct collision between the granular coal and the bottom of the coal drop pipe, and to prevent direct contact between the coal particles and the bottom of the coal drop pipe, and to allow the coal particles to directly contact with part of the coal accumulated at the bottom of the coal drop pipe, thereby preventing direct wear on the bottom of the coal drop pipe, increasing the service life of the coal drop pipe, preventing coal leakage and pollution of the surrounding environment, and reducing maintenance costs at the same time; and when the coal particles directly contact with part of the coal accumulated at the bottom of the coal drop pipe, the two collide, which can break part of the coal particles, thereby effectively ensuring rapid combustion of the coal.

[0024] The above-mentioned records related to the content of the invention are only an overview of the technical solution of this application. In order to enable ordinary technicians in this field to understand the technical solution of this application more clearly, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purposes and other purposes, features and advantages of this application easier to understand, the following is an explanation in combination with the specific implementation methods and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of this application and other related contents, and are not to be considered as limiting this application.

[0026] In the drawings of the specification:

[0027] Figure 1 This is one of the structural diagrams of the circulating fluidized coal-fired boiler described in the specific implementation method;

[0028] Figure 2 This is the second structural diagram of the circulating fluidized coal-fired boiler described in the specific implementation method;

[0029] Figure 3 This is one of the side views of the coal drop pipe according to the specific embodiment;

[0030] Figure 4 This is the second side view of the coal drop pipe described in the specific embodiment;

[0031] Figure 5 This is the third side view of the coal drop pipe described in the specific implementation method.

[0032] The reference numerals in the above drawings are described as follows:

[0033] 1. Furnace,

[0034] 2. Coal drop pipe,

[0035] 3. Feed pipe,

[0036] 31. Feed port,

[0037] 4. The first coal storage mechanism,

[0038] 41. First partition,

[0039] 42. First crushing protrusion,

[0040] 5. The second crushing protrusion,

[0041] 6. Separation mechanism,

[0042] 7. Return material device,

[0043] 8. Return pipe. DETAILED DESCRIPTION

[0044] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0045] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0046] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0047] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0048] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0049] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0050] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0051] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0052] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] See also Figures 1 to 5 This embodiment relates to a circulating fluidized bed coal-fired boiler, comprising:

[0054] Furnace 1, wherein furnace 1 serves as a combustion chamber to ensure sufficient combustion of the circulating fluidized coal-fired boiler.

[0055] A coal drop pipe 2 is arranged at an angle on the furnace 1, wherein the inclined arrangement of the coal drop pipe 2 facilitates the falling of the coal into the furnace 1; one end of the coal drop pipe 2 is connected to the furnace 1, and one end of the coal drop pipe 2 is communicated with the furnace 1; wherein the coal is transported to the furnace 1 for combustion through the coal drop pipe 2.

[0056] The feed pipe 3 is tilted and arranged on the coal drop pipe 2, wherein the feed pipe 3 is tilted so that the coal falls into the coal drop pipe 2; one end of the feed pipe 3 is connected to the other end of the coal drop pipe 2, and the other end of the feed pipe 3 is provided with a feed port 31, and the coal is put in from the feed port 31. The feed pipe 3 is connected to the coal drop pipe 2, and the tilt angle of the feed pipe 3 relative to the furnace 1 is greater than the tilt angle of the coal drop pipe 2 relative to the furnace 1, so as to facilitate the coal to fall into the coal drop pipe 2 quickly and improve work efficiency. In this embodiment, as Figures 1 to 5 As shown, the diameter of the feed pipe 3 gradually decreases from the feed port 31 from top to bottom, so as to facilitate the rapid falling of the coal into the coal drop pipe 2 and realize rapid coal dropping.

[0057] And a first coal storage mechanism 4, the first coal storage mechanism 4 is arranged at the bottom of the inner wall of the coal drop pipe 2, and the first coal storage mechanism 4 is used to accumulate part of the coal at the bottom of the inner wall of the coal drop pipe 2 to avoid direct collision between the granular coal and the bottom of the coal drop pipe 2, prevent the coal particles from directly contacting the bottom of the coal drop pipe 2, and allow the coal particles to directly contact with part of the coal accumulated at the bottom of the coal drop pipe 2, thereby preventing direct wear on the bottom of the coal drop pipe 2, increasing the service life of the coal drop pipe 2, preventing coal leakage and pollution of the surrounding environment, and reducing maintenance costs at the same time; and when the coal particles directly contact with part of the coal accumulated at the bottom of the coal drop pipe 2, the two collide, which can break part of the coal particles, so as to effectively ensure rapid combustion of the coal.

[0058] Specifically, in the circulating fluidized bed coal-fired boiler of this embodiment, when operating, the coal is put into the feed pipe 3 from the feed port 31, and then falls into the coal drop pipe 2 from the feed pipe 3, and finally the coal falls into the furnace 1 from the coal drop pipe 2 for combustion, wherein a first coal storage mechanism 4 is provided at the bottom of the inner wall of the coal drop pipe 2, and part of the coal is accumulated at the bottom of the inner wall of the coal drop pipe 2 by providing the first coal storage mechanism 4, so as to avoid direct collision between the granular coal and the bottom of the coal drop pipe 2, and prevent the coal particles from directly contacting the bottom of the coal drop pipe 2, so as to allow the coal particles to directly contact with part of the coal accumulated at the bottom of the coal drop pipe 2, to prevent direct wear on the bottom of the coal drop pipe 2, to increase the service life of the coal drop pipe 2, to prevent coal leakage and pollution of the surrounding environment, and to reduce maintenance costs at the same time, and when the coal particles directly contact with part of the coal accumulated at the bottom of the coal drop pipe 2, the two collide, which can break part of the coal particles, so as to effectively ensure rapid combustion of the coal.

[0059] Optionally, in some embodiments, Figures 1 to 5 As shown, the first coal storage mechanism 4 includes a plurality of first baffles 41; the plurality of first baffles 41 are arranged along the bottom of the inner wall of the coal drop pipe 2 at intervals, so that part of the coal can be stored in the gap between two adjacent first baffles 41, preventing the coal particles from directly contacting the bottom of the coal drop pipe 2. The coal particles are allowed to directly contact the part of the coal accumulated in the gap between the two adjacent first baffles 41, thereby preventing direct wear on the bottom of the coal drop pipe 2, increasing the service life of the coal drop pipe 2, preventing coal leakage and pollution of the surrounding environment, and reducing maintenance costs. When the coal particles directly contact the part of the coal accumulated at the bottom of the coal drop pipe 2, the two collide and break some of the coal particles, thereby effectively ensuring rapid combustion of the coal. The plurality of first baffles 41 are respectively connected to the bottom of the inner wall of the coal drop pipe 2; the bottoms of the plurality of first baffles 41 are respectively in contact with the bottom of the inner wall of the coal drop pipe 2, so that part of the coal can be stored in the gap between two adjacent first baffles 41. The height of each of the multiple first baffles 41 is smaller than the aperture of the coal drop pipe 2, facilitating the drop of coal from the coal drop pipe 2 into the furnace 1. It should be noted that in this embodiment, the number of first baffles 41 is not limited and can be set based on practical needs. It should be noted that the structure of the first coal storage mechanism 4 of this embodiment is not limited to this. Those skilled in the art may select other suitable first coal storage mechanisms 4 based on the teachings of this embodiment.

[0060] Specifically, in this embodiment, Figures 1 to 5As shown, during operation, the coal is put into the feed pipe 3 from the feed port 31, and then falls into the coal drop pipe 2 from the feed pipe 3, and finally the coal falls into the furnace 1 from the coal drop pipe 2 for combustion, wherein a plurality of first baffles 41 are provided at the bottom of the inner wall of the coal drop pipe 2, and are arranged in an interval-arranged manner to avoid direct collision between the granular coal and the bottom of the coal drop pipe 2, so that part of the coal can be accumulated in the gap between the two adjacent first baffles 41, preventing the coal particles from directly contacting the bottom of the coal drop pipe 2, allowing the coal particles to directly contact the part of the coal accumulated in the gap between the two adjacent first baffles 41, preventing direct wear on the bottom of the coal drop pipe 2, increasing the service life of the coal drop pipe 2, preventing coal leakage and pollution of the surrounding environment, and reducing maintenance costs at the same time; and when the coal particles directly contact the part of the coal accumulated at the bottom of the coal drop pipe 2, the collision between the two can break part of the coal particles, so as to effectively ensure rapid combustion of the coal.

[0061] Optionally, in some embodiments, Figures 1 to 5 As shown, a plurality of first baffles 41 are arranged at an angle along the bottom of the inner wall of the coal drop pipe 2. Such an arrangement ensures that the coal drops into the furnace 1 in an orderly manner for combustion while ensuring that the coal drop pipe 2 is not worn. Optionally, in certain embodiments, the inclination angle between the first baffles 41 and the coal drop pipe 2 is 50-60°. Preferably, in this embodiment, the inclination angle between the first baffles 41 and the coal drop pipe 2 is 55°, so as to ensure that the coal drops into the furnace 1 in an orderly manner for combustion while ensuring that the coal drop pipe 2 is not worn.

[0062] Optionally, in some embodiments, Figures 1 to 5 As shown, the height of the first partition 41 is 50-70 mm, and the width of the interval between two adjacent first partitions 41 is 50-70 mm. Figures 1 to 5 As shown, the height of the first baffle 41 is 60 mm, and the width of the interval between two adjacent first baffles 41 is 60 mm. This arrangement ensures that while ensuring that the coal falls into the furnace 1 for combustion in an orderly manner, it can also ensure that part of the coal can be accumulated in the interval between the two adjacent first baffles 41 to prevent the coal particles from directly contacting the bottom of the coal drop pipe 2, and allows the coal particles to directly contact part of the coal accumulated in the interval between the two adjacent first baffles 41 to prevent direct wear on the bottom of the coal drop pipe 2.

[0063] Preferably, in this embodiment, Figures 1 to 5 As shown, the first partition plate 41 is in an arc shape to ensure that the first partition plate 41 fits closely with the bottom of the coal drop pipe 2 and can store the burning coal.

[0064] Optionally, in some embodiments, Figures 1 to 5As shown, a first crushing protrusion 42 is provided on the top of the first partition 41, and the first crushing protrusion 42 is used to crush the granular coal, wherein the first crushing protrusion 42 is serrated in shape. By providing the first crushing protrusion 42 on the top of the first partition 41, the first crushing protrusion 42 can crush the coal particles in the process of rolling down. The coal particles collide with the first crushing protrusion 42 to achieve a crushing effect, so as to effectively ensure the rapid combustion of the coal.

[0065] Optionally, in some embodiments, Figures 1 to 5 As shown, the circulating fluidized coal-fired boiler further includes a second crushing protrusion 5, which is disposed at the top of the inner wall of the coal drop pipe 2 and is fixedly connected to the inner wall of the coal drop pipe 2. The second crushing protrusion 5 is used to crush coal particles. The second crushing protrusion 5 is serrated in shape. By providing the second crushing protrusion 5 at the top of the inner wall of the coal drop pipe 2, the second crushing protrusion can crush coal particles as they roll down. The coal particles collide with the second crushing protrusion 5, thereby crushing them and effectively ensuring rapid combustion of the coal.

[0066] Optionally, in some embodiments, Figures 1 to 5 As shown, the circulating fluidized coal-fired boiler also includes a separation mechanism 6, a returner 7 and a return pipe 8; the separation mechanism 6 is connected to the smoke outlet of the furnace 1, and the separation mechanism 6 is used to separate solid particles (such as dust, fly ash, etc.) in the flue gas; the solid particles in the flue gas are separated by the separation mechanism 6 to improve environmental protection. The separation mechanism 6 in this embodiment is a cyclone separator. The returner 7 is arranged below the separation mechanism 6, and the returner 7 is connected to the separation mechanism 6. The returner 7 is connected to the furnace 1 through the return pipe 8. The returner 7 is used to collect the cabinet particles separated by the separation mechanism 6 and return them to the furnace 1 through the return pipe 8 for recycling.

[0067] It should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A circulating fluidized bed coal-fired boiler, characterized in that: include: furnace, a coal drop pipe, the coal drop pipe being obliquely arranged on the furnace, one end of the coal drop pipe being connected to the furnace, and one end of the coal drop pipe being in communication with the furnace; And a first coal storage mechanism, which is arranged at the bottom of the inner wall of the coal drop pipe and is used to accumulate part of the coal at the bottom of the inner wall of the coal drop pipe to avoid direct collision between the granular coal and the bottom of the coal drop pipe.

2. The circulating fluidized bed coal-fired boiler according to claim 1, characterized in that: The first coal storage mechanism includes a plurality of first partitions; The plurality of first baffles are respectively arranged along the bottom of the inner wall of the coal drop pipe in an interval-arranged manner, and the plurality of first baffles are respectively connected to the bottom of the inner wall of the coal drop pipe; The bottoms of the plurality of first baffles are respectively fitted with the bottoms of the inner walls of the coal drop pipes; The heights of the plurality of first partitions are all smaller than the aperture of the coal drop pipe.

3. The circulating fluidized bed coal-fired boiler according to claim 2, characterized in that: The plurality of first baffles are respectively arranged obliquely along the bottom of the inner wall of the coal drop pipe.

4. The circulating fluidized bed coal-fired boiler according to claim 3, characterized in that: The inclination angle between the first partition and the coal drop pipe is 50-60°.

5. The circulating fluidized bed coal-fired boiler according to any one of claims 2 to 4, characterized in that: The height of the first partition is 50-70 mm, and the width of the interval between two adjacent first partitions is 50-70 mm.

6. The circulating fluidized bed coal-fired boiler according to any one of claims 2 to 4, characterized in that: The first partition is in an arc shape.

7. The circulating fluidized bed coal-fired boiler according to any one of claims 2 to 4, characterized in that: A first crushing protrusion is provided on the top of the first partition, and the first crushing protrusion is used to crush the granular coal.

8. The circulating fluidized bed coal-fired boiler according to claim 1, characterized in that: The circulating fluidized coal-fired boiler further includes a second crushing protrusion, which is arranged on the top of the inner wall of the coal drop pipe, is fixedly connected to the inner wall of the coal drop pipe, and is used to crush granular coal.

9. The circulating fluidized bed coal-fired boiler according to claim 1, characterized in that: The circulating fluidized coal-fired boiler also includes a feed pipe, which is obliquely arranged on the coal drop pipe. One end of the feed pipe is connected to the other end of the coal drop pipe. The other end of the feed pipe is provided with a feed port. The feed pipe is connected to the coal drop pipe. The inclination angle of the feed pipe relative to the furnace is greater than the inclination angle of the coal drop pipe relative to the furnace.

10. The circulating fluidized bed coal-fired boiler according to claim 1, characterized in that: The circulating fluidized coal-fired boiler further includes a separation mechanism, a material return device and a material return pipe; The separation mechanism is connected to the smoke outlet of the furnace, and is used to separate solid particles in the smoke; The material returner is arranged below the separation mechanism, the material returner is communicated with the separation mechanism, and the material returner is communicated with the furnace through the material return pipe.

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