High-temperature flue gas reverse-flowing prevention device for W-shaped flame boiler burner

Abstract

The utility model discloses a W-shaped flame boiler burner high-temperature flue gas backflow prevention device which comprises a nozzle and a primary air branch pipe, one end of the primary air branch pipe is connected with a pulverized coal receiving pipeline of each burner through the nozzle, and the other end of the primary air branch pipe is connected with a primary air header pipe. And the orientation of the nozzle is the same as the coal feeding direction of the pulverized coal receiving pipeline. By means of the structural design of the device, the situation that high-temperature flue gas flows backwards when the combustor is shut down is effectively prevented, and safe operation of the boiler is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of power plant boiler technology, and in particular relates to a device for preventing high-temperature flue gas backflow in a W-type flame boiler burner. Background Technology

[0002] W-type flame boilers are power plant boilers suitable for burning low-volatile, difficult-to-burn coals such as lean coal and anthracite. The pulverized coal burns in a "W"-shaped flame inside the furnace, increasing the residence time of the pulverized coal particles and aiding in complete combustion. However, anthracite and lean coal have low volatile content, resulting in poor ignition and burnout characteristics, requiring a longer combustion time. In actual operation, previous W-type flame boilers have suffered from insufficient flame depth, unstable combustion, and high carbon content in fly ash combustibles.

[0003] In response to these issues, many W-type flame boilers have upgraded their combustion systems in recent years, adopting overhead burners with direct-flow nozzles, such as... Figure 1 As shown. This type of burner has strong flame rigidity, effectively solving the problems of insufficient flame downward thrust, unstable combustion, and high carbon content in fly ash combustibles. However, other problems have also arisen. Because the burner uses a direct-flow nozzle with low resistance, when the boiler is running at low load, the shut-down burner nozzle is prone to backflow of high-temperature flue gas from the furnace. In severe cases, it may even backflow into the pulverized coal pipeline upstream of the burner, causing the pipeline to glow red, seriously affecting boiler safety.

[0004] To address this issue, the application proposes a device for preventing high-temperature flue gas backflow in W-flame boiler burners. Utility Model Content

[0005] The purpose of this utility model is to overcome the problems of the prior art by disclosing a high-temperature flue gas backflow prevention device for W-type flame boiler burners. The structural design of this device effectively prevents high-temperature flue gas backflow in shut-down burners, thus ensuring the safe operation of the boiler.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A high-temperature flue gas backflow prevention device for a W-type flame boiler burner, comprising: a nozzle and a primary air branch pipe.

[0008] One end of the primary air branch pipe is connected to the pulverized coal receiving pipe of each burner via a nozzle, and the other end is connected to the primary air main pipe;

[0009] Furthermore, the nozzle is oriented in the same direction as the coal feeding direction of the pulverized coal receiving pipe.

[0010] According to a preferred embodiment, the nozzle is located upstream of the burner bend.

[0011] According to a preferred embodiment, the primary air branch pipe is provided with a shut-off valve.

[0012] According to a preferred embodiment, the shut-off valve is a pneumatic shut-off valve.

[0013] According to a preferred embodiment, the primary air main is either the primary air main on the front wall of the boiler or the primary air main on the rear wall of the boiler.

[0014] According to a preferred embodiment, the primary air main pipe is connected to the boiler primary air header via a connecting pipe.

[0015] According to a preferred embodiment, the connecting pipe is provided with a valve body structure.

[0016] According to a preferred embodiment, the primary air main duct is provided with a valve body structure near the connecting pipe.

[0017] According to a preferred embodiment, the valve body structure is an electrically operated shut-off valve.

[0018] The aforementioned main solution of this utility model and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted by this utility model and for which protection is sought. Those skilled in the art, after understanding the solution of this utility model, will realize, based on existing technology and common knowledge, that there are many combinations, all of which are technical solutions to be protected by this utility model; therefore, they are not exhaustively listed here.

[0019] The beneficial effects of this utility model are:

[0020] This application discloses a high-temperature flue gas backflow prevention device for W-type flame boiler burners. The structural design of this device effectively prevents high-temperature flue gas backflow during burner shutdown, ensuring the safe operation of the boiler. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the burner arrangement structure of a traditional W-type flame boiler;

[0022] Figure 2 This is a schematic diagram of the high-temperature flue gas backflow prevention device for the W-type flame boiler burner in this application;

[0023] Figure 3 This is a schematic diagram of the overall structure of the anti-high-temperature flue gas backflow device for the W-type flame boiler burner in this application;

[0024] Among them, 101-DC burner, 102-coal powder connection pipe, 103-burner elbow, 201-burner, 202-burner elbow, 203-coal powder connection pipe, 204-nozzle, 205-primary air branch pipe, 206-shut-off valve, 207-primary air main pipe. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Furthermore, it should be noted that unless otherwise specified, the specific structures, connections, positions, power sources, etc. involved in this utility model are all things that a person skilled in the art can know without creative effort based on the prior art.

[0031] refer to Figure 2 and Figure 3 As shown in the figure, a high-temperature flue gas backflow prevention device for a W-type flame boiler burner is provided. The W-type flame boiler burner high-temperature flue gas backflow prevention device includes: a nozzle 204 and a primary air branch pipe 205.

[0032] One end of the primary air branch pipe 205 is connected to the pulverized coal receiving pipe 203 of each burner 201 via a nozzle 204, and the other end is connected to the primary air main pipe 207; and the orientation of the nozzle 204 is the same as the coal feeding direction of the pulverized coal receiving pipe 203.

[0033] Preferably, the nozzle 204 is located upstream of the bend of the burner 201.

[0034] Preferably, a shut-off valve 206 is provided on the primary air branch pipe 205. For example, the shut-off valve 206 is a pneumatic shut-off valve 206.

[0035] Preferably, the primary air main duct 207 is either the primary air main duct on the front wall of the boiler or the primary air main duct on the rear wall of the boiler. Further, the primary air main duct 207 is connected to the boiler primary air header via a connecting pipe.

[0036] Preferably, the connecting pipe is provided with a valve body structure. The primary air main duct 207 is provided with a valve body structure near the connecting pipe. The valve body structure is an electrically operated shut-off valve 206.

[0037] Example

[0038] like Figure 2 As shown, an anti-backflush gas nozzle 204 is installed at the elbow upstream of the burner 201 nozzle. The anti-backflush gas uses high-pressure primary air from the boiler. Each burner is connected to a primary air branch pipe 205 to the interface of the anti-backflush gas nozzle 204. When the boiler is running at low load, the pneumatic shut-off valve 206 on the primary air branch pipe 205 of the shut-off burner 201 can be opened. A certain amount of high-pressure primary air will be injected into the burner 201 nozzle through the anti-backflush gas nozzle 204, which can effectively prevent high-temperature flue gas in the furnace from flowing back into the burner.

[0039] like Figure 3As shown, primary air is drawn from the boiler's primary air main pipe. Primary air from the boiler's primary air main pipe is then directed to the primary air main pipe on the front wall of the boiler and the primary air main pipe on the rear wall of the boiler. Several primary air branch pipes 205 are then drawn from the primary air main pipe and connected to the corresponding burners 201. Each burner 201's primary air branch pipe 205 is equipped with a pneumatic quick-closing valve, and electric regulating valves are installed on the primary air main pipes on the front and rear walls to adjust the airflow.

[0040] This application discloses a high-temperature flue gas backflow prevention device for W-type flame boiler burners. The structural design of this device effectively prevents high-temperature flue gas backflow during burner shutdown, ensuring the safe operation of the boiler.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for preventing high-temperature flue gas back-purge in a W-shaped flame boiler burner, characterized in that, The high-temperature flue gas backflow prevention device for the W-shaped flame boiler burner comprises a nozzle (204) and a primary air branch pipe (205), One end of the primary air branch pipe (205) is connected with the coal powder connecting pipe (203) of each burner (201) through the nozzle (204), and the other end is connected with a primary air main pipe (207); The direction of the nozzle (204) is the same as the coal feeding direction of the coal powder connecting pipe (203).

2. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 1, characterized in that, The nozzle (204) is arranged upstream of the burner elbow (202).

3. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 1, characterized in that, A shut-off valve (206) is arranged on the primary air branch pipe (205).

4. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 3, characterized in that, The shut-off valve (206) is a pneumatic shut-off valve.

5. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 1, characterized in that, The primary air main pipe (207) is a primary air main pipe of a front wall of the boiler or a primary air main pipe of a rear wall of the boiler.

6. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 1, characterized in that, The primary air main pipe (207) is connected with a primary air main pipe of the boiler through a connecting pipe.

7. The high temperature flue gas back-pumping preventing device for a W-shaped flame boiler burner according to claim 6, characterized in that, A valve body structure is arranged on the connecting pipe.

8. The high temperature flue gas back-pumping prevention device for a W-shaped flame boiler burner according to claim 6, characterized by The primary air main pipe (207) is provided with a valve body structure close to the connecting pipe.

9. The high temperature flue gas back-piston device of the W-shaped flame boiler burner according to claim 7 or 8, characterized in that, The valve body structure is an electric shut-off valve.

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