Novel biomass burner

Abstract

The utility model belongs to the technical field of coal-fired power generation equipment, and provides a novel biomass burner which comprises a biomass nozzle, a secondary air nozzle and a biomass channel. The secondary air nozzle comprises an air outlet end and a connecting end, and the connecting end is fixedly connected with an air door frame of the air bellow; a through hole is formed in the center of the secondary air nozzle; the biomass nozzle is arranged in the through hole in a penetrating manner; one end of the biomass channel communicates with the biomass nozzle, and the end, away from the biomass nozzle, of the biomass channel extends to penetrate through a shell of the air bellow. And the total ventilation area of each air passing window at the air outlet end is consistent with the total ventilation area of the secondary air original nozzle. The structure of the secondary air nozzle of the combustion boiler is improved, and the biomass nozzle connected with the biomass channel and the secondary air nozzle are combined together to form the biomass combustor while the momentum of the original secondary air nozzle is not changed. On the premise that the overall combustion structure of the boiler is not changed, biomass blending combustion of the pulverized coal boiler is achieved, and use of coal is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of coal-fired power generation equipment, and specifically relates to a new type of biomass burner. Background Art

[0002] With the rapid development of society, the gradual decline of mineral energy reserves is an unavoidable issue. In the coal-fired power generation industry, the use of biomass in pulverized coal boilers will be a future trend. Biomass is a naturally renewable resource, and its combustion produces very low carbon dioxide emissions, making it more environmentally friendly than coal combustion.

[0003] Existing coal-fired boilers use an even air distribution system in their burner layout. Generally, one or more secondary air nozzles are arranged near a pulverized coal burner. However, due to limited space inside the boiler, there is no room for additional biomass nozzles. The cost of machining or replacing the boiler itself is enormous, making the implementation of biomass co-firing in pulverized coal boilers difficult. Summary of the Invention

[0004] In order to solve the problem that it is difficult to newly arrange a biomass burner in an existing coal-fired boiler, the present application provides a new type of biomass burner.

[0005] In one embodiment, a novel biomass burner includes a biomass nozzle, a secondary air nozzle, and a biomass channel;

[0006] The secondary air nozzle is in the shape of a quadrangular prism that tapers outward from the wind box. The secondary air nozzle includes an air outlet end and a connection end. The connection end is fixedly connected to the damper frame of the wind box. A through hole is formed in the center of the secondary air nozzle. The biomass nozzle is disposed in the through hole. One end of the biomass channel is connected to the biomass nozzle. The end of the biomass channel facing away from the biomass nozzle extends through the shell of the wind box.

[0007] Among them, the projection of the connecting end on the bellows is consistent with the connecting part of the secondary air original nozzle; the air outlet end is constructed with a plurality of air windows, and the total ventilation area of each air window is consistent with the total ventilation area of the secondary air original nozzle.

[0008] In one embodiment, the novel biomass burner further includes a swing assembly; the swing assembly includes a movable portion and a fixed portion hinged to each other; the movable portion is fixedly connected to the secondary air nozzle; and the fixed portion is fixedly connected to the biomass nozzle or biomass channel.

[0009] In one embodiment, the novel biomass burner further includes a bellows flange; the bellows flange is fixedly connected to the biomass channel, and the bellows flange is located on a structural section of the biomass channel at one end away from the biomass nozzle.

[0010] In one solution, the new biomass burner further includes a support assembly; the support assembly is used to connect the biomass channel and the housing of the air box; at least one support assembly is provided, and the support assembly is detachably and fixedly connected to the biomass channel or the housing of the air box.

[0011] In one solution, the biomass nozzle and the biomass channel are integrally processed and manufactured or assembled and linked; at least a part of the structural section of the biomass nozzle is in the shape of a conical cylinder that tapers in the extending direction from the biomass channel or a shape formed by superimposing a conical cylinder and a cylindrical cylinder.

[0012] In one solution, the projection of the biomass nozzle in the horizontal direction is circular, square or irregular.

[0013] Advantages of this application:

[0014] By improving the structure of the secondary air nozzle of the combustion boiler, while not changing the original momentum of the secondary air nozzle, the biomass nozzle connected with the biomass channel is combined with the secondary air nozzle to form a biomass burner. Without changing the overall combustion structure of the boiler, biomass is co-fired in a pulverized coal boiler, reducing the use of coal; and due to the supporting assembly structure of the secondary air nozzle and the air box, this new biomass burner can be applied to coal-fired boilers of various furnace types. Description of the drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is the front view of the new biomass burner in an embodiment of this application;

[0017] Figure 2 is the top view of the new biomass burner in an embodiment of this application;

[0018] Figure 3 is the side view of the new biomass burner in an embodiment of this application;

[0019] Figure 4 is the schematic diagram of the original secondary air nozzle in an embodiment of this application;

[0020] Reference numerals in the drawings:

[0021] 1. Biomass nozzle; 2. Secondary air nozzle; 21. Air outlet end; 22. Connection end; 3. Biomass channel; 4. Swing assembly; 5. Air box flange; 6. Support assembly. Detailed implementation manners

[0022] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application. Similarly, the following embodiments are only partial embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0025] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] In this application, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0027] To solve the problem that it is difficult to newly arrange a biomass burner in an existing coal-fired boiler, this application provides a new type of biomass burner, and the specific embodiments are as follows:

[0028] In one embodiment, please refer to Figures 1 to 4 , a new type of biomass burner includes a biomass nozzle 1, a secondary air nozzle 2, and a biomass channel 3.

[0029] In this embodiment, the secondary air nozzle 2 includes an air outlet end 21 and a connection end 22, and the secondary air nozzle 2 is in the shape of a quadrangular prism that gradually tapers outward from the air box, which can guide and concentrate the secondary air before it is ejected, improving the air outlet speed and range of the secondary air; the connection end 22 is fixedly connected to the damper frame of the air box, that is, the new type of biomass burner is assembled to the combustion boiler through the secondary air nozzle 2. Among them, the air box is an important part of the combustion boiler, which plays the role of evenly distributing air, adjusting the air volume, and stabilizing the air pressure during the operation of the boiler; the damper frame is the structural frame of the air box housing for arranging each air outlet, and each original secondary air nozzle and pulverized coal burner are arranged on the air box through the damper frame.

[0030] In this embodiment, a through hole is opened in the center of the secondary air nozzle 2, and the biomass nozzle 1 is inserted into the through hole, and then combined into an overall structure with the biomass nozzle 1 in the center and the secondary air nozzle 2 on the periphery; the biomass channel 3 is a channel for transporting biomass and its medium, and at the same time also plays the role of connecting the biomass nozzle 1 and fixing the secondary air nozzle 2; one end of the biomass channel 3 is connected to the biomass nozzle 1, and the other end of the biomass channel 3 extends through the housing of the air box and is connected to the biomass feeding component.

[0031] In this embodiment, the projection of the connection end 22 on the air box coincides with the connection part of the original secondary air nozzle, that is, the new type of biomass burner can be assembled to the air box directly at the position of the original secondary air nozzle by using the secondary air nozzle 2, avoiding reprocessing of the boiler.

[0032] In this embodiment, the air outlet end 21 is configured with a plurality of air windows, the total ventilation area of each of which is consistent with the total ventilation area of the secondary air source nozzles. Compared to the secondary air source nozzles, the secondary air nozzles 2 occupy a certain amount of ventilation area at their center due to the biomass nozzle 1 passing through them. However, since the secondary air nozzles 2 are quadrangular prisms that taper outward from the windbox, by adjusting the tapering of the sidewalls of the secondary air nozzles 2 and appropriately increasing the area of the air outlet end 21, the total ventilation area of the secondary air nozzles 2 can be made consistent with the total ventilation area of the secondary air source nozzles, thereby maintaining the momentum characteristics of the boiler's secondary air.

[0033] Therefore, this application improves the structure of the secondary air nozzle 2 of the combustion boiler, combining the biomass nozzle 1 connected to the biomass channel 3 with the secondary air nozzle 2 without changing the momentum characteristics of the boiler's secondary air, to form a biomass burner. While maintaining the overall combustion structure of the boiler, it achieves the co-firing of biomass in the pulverized coal boiler, reducing coal usage. Furthermore, through the matching assembly structure of the secondary air nozzle 2 and the wind box, this new biomass burner can be adapted to various types of coal-fired boilers by correspondingly improving the shape of the connection end 22 of the secondary air nozzle 2.

[0034] In one embodiment, the novel biomass burner further includes a swing assembly 4; the swing assembly 4 includes a movable portion and a fixed portion hinged to each other; the movable portion is fixedly connected to the secondary air nozzle 2; and the fixed portion is fixedly connected to the biomass nozzle 1 or the biomass channel 3. During boiler combustion operation, it is sometimes necessary to adjust the flame shape and position to enhance combustion or stabilize the flame. This process is generally achieved by the damper frame driving the secondary air source nozzle and the pulverized coal burner to swing. By providing the swing assembly 4, the damper frame can drive the secondary air nozzle 2 to swing along with the secondary air source nozzle and the pulverized coal burner while maintaining the biomass nozzle 1 from swinging.

[0035] In one embodiment, the novel biomass burner further includes a bellows flange 5, which is fixedly connected to the biomass passage 3 and located on the end of the biomass passage 3 facing away from the biomass nozzle 1. The bellows flange 5 serves as a sealing window for the assembly and connection between the biomass burner and the bellows, ensuring that the interior of the bellows is sealed from the outside world after the novel biomass burner and the bellows are assembled.

[0036] In one embodiment, the novel biomass burner further includes a support assembly 6; the support assembly 6 is used to connect the biomass channel 3 and the bellows shell, that is, to ensure the relative fixation of the biomass channel 3 and the bellows shell; at least one support assembly 6 is provided, and the support assembly 6 is detachably fixed to the biomass channel 3 or the bellows shell.

[0037] In one embodiment, the biomass nozzle 1 and the biomass channel 3 are integrally manufactured or assembled and linked; at least a partial structural segment of the biomass nozzle 1 is in the shape of a conical cylinder that tapers in the extending direction from the biomass channel 3, or a shape formed by superimposing a conical cylinder and a cylindrical tube, whereby acceleration can be performed when the biomass is ejected, the range of the biomass can be increased, and biomass co-combustion can be promoted.

[0038] In one embodiment, the projection of the biomass nozzle in the horizontal direction is circular, square or irregular.

[0039] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A novel biomass burner, characterized in that, It includes a biomass nozzle (1), a secondary air nozzle (2) and a biomass channel (3); The secondary air nozzle (2) is in the shape of a quadrangular prism that gradually contracts outward from the wind box. The secondary air nozzle (2) includes an air outlet end (21) and a connecting end (22); the connecting end (22) is fixedly connected to the damper frame of the wind box; a through hole is opened in the center of the secondary air nozzle (2); the biomass nozzle (1) is inserted into the through hole; one end of the biomass channel (3) is connected to the biomass nozzle (1), and the end of the biomass channel (3) facing away from the biomass nozzle (1) extends through the shell of the wind box; The projection of the connecting end (22) on the wind box is consistent with the connecting portion of the secondary air original nozzle; the air outlet end (21) is constructed with a plurality of air windows, and the total ventilation area of each of the air windows is consistent with the total ventilation area of the secondary air original nozzle.

2. The novel biomass burner according to claim 1, characterized in that, Also included is a swing assembly (4); The swing assembly (4) comprises a movable part and a fixed part which are hinged to each other; the movable part is fixedly connected to the secondary air nozzle (2); and the fixed part is fixedly connected to the biomass nozzle (1) or the biomass channel (3).

3. The novel biomass burner according to claim 1, characterized in that, It also includes a bellows flange (5); the bellows flange (5) is fixedly connected to the biomass channel (3), and the bellows flange (5) is located on a structural section of the biomass channel (3) at one end away from the biomass nozzle (1).

4. The novel biomass burner according to claim 1, characterized in that, It also includes a support assembly (6); the support assembly (6) is used to connect the biomass channel (3) and the shell of the wind box; at least one support assembly (6) is provided, and the support assembly (6) is detachably fixedly connected to the biomass channel (3) or the shell of the wind box.

5. The novel biomass burner according to claim 1, characterized in that The biomass nozzle (1) and the biomass channel (3) are integrally manufactured or assembled and linked; At least part of the structural section of the biomass nozzle (1) is in the shape of a cone or a superposition of a cone and a cylinder that gradually contracts from the biomass channel (3) toward the extension direction.

6. The novel biomass burner according to any one of claims 1-5, characterized in that, The horizontal projection of the biomass nozzle (1) is circular, square or irregular.

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