Boiler burner capable of changing tangent circle diameter and center position

Abstract

The utility model provides a boiler burner capable of changing tangent circle diameter and center position, which comprises air boxes arranged at four corners or four walls of a boiler furnace, the inner part of each air box is divided into a partition bin by a partition plate along the height direction, and a secondary air nozzle and a primary air nozzle are arranged in each partition bin. The secondary air nozzle and the primary air nozzle are respectively connected with an air bellow, and rotating devices are arranged on the air bellow of the secondary air nozzle and the air bellow of the primary air nozzle; the utility model has the beneficial effects that through the arrangement of the rotating device, when the rotating rocker rotates, the connecting rod mechanism is driven, and then the connecting rod mechanism drives the secondary air nozzle and the primary air nozzle to rotate, so that the direction of air flow at an outlet is changed; the outlet airflow direction deviates from the installation center line of the air bellow by the same angle, the diameter and the center position of an imaginary tangent circle formed by combustor airflow in the center of a hearth correspondingly change, and therefore the effect of adjusting the combustion working condition of the boiler is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler burners, in particular to a boiler burner capable of changing the diameter and center position of a cutting circle. Background Art

[0002] Under the current goal of low-carbon energy transformation in my country, new energy sources such as wind power and photovoltaics will gradually become the main power supply. The instability of new energy power generation has had a relatively large impact on the security of the power grid, so the flexible operation capability of thermal power units is an important factor in ensuring the security of the power grid. Under this realistic situation, deep peak regulation of thermal power units, participation in power grid load adjustment, and absorption of new energy power generation have become the normal operation of many thermal power plants. During the peak regulation process, the boiler load change rate is large, and the combustion conditions are prone to instability. In addition, due to the unstable source of coal quality in power plants and frequent changes, boiler burners often cannot take into account the combustion requirements of different types of coal. Existing boiler burners have limited means and poor effects in adjusting the combustion circle, resulting in the coal powder combustion conditions easily deviating from the optimal state when the boiler is operated at variable load and the coal quality changes, and then there will be problems such as furnace slagging, high-temperature corrosion of the water-cooled wall, and over-temperature pipe burst. Utility Model Content

[0003] In order to overcome the above problems existing in the prior art, the utility model provides a boiler burner capable of changing the diameter and center position of a cutting circle.

[0004] The utility model discloses a boiler burner capable of changing the diameter and center position of a cutting circle, comprising a wind box arranged at the four corners or four walls of a boiler furnace, wherein the wind box is divided into compartments by a partition plate along a height direction, wherein a secondary air nozzle and a primary air nozzle are arranged in the compartment, wherein the secondary air nozzle and the primary air nozzle are respectively connected to the wind box, and a rotating device is arranged on the wind box of the secondary air nozzle and the primary air nozzle, wherein the rotating device comprises a rotating rocker, a connecting rod mechanism and a rotating shaft.

[0005] On this basis, the rotating rocker is connected to the bellows, one end of the connecting rod mechanism is rotationally connected to the rotating rocker, and the other end is rotationally connected to the primary air nozzle and the secondary air nozzle.

[0006] On this basis, the primary air nozzle is connected to a primary air nozzle pipe, the primary air nozzle is connected to the primary air nozzle pipe via a rotating shaft, and the secondary air nozzle is connected to the bellows via a rotating shaft.

[0007] On this basis, the rotation of the rotary rocker can be driven manually or by an electric actuator or a pneumatic actuator.

[0008] On this basis, the secondary air nozzles and primary air nozzles are arranged alternately from bottom to top along the furnace height direction, or similar nozzles are relatively concentrated and closely arranged. The secondary air nozzles use a single nozzle or can be composed of a group of multiple nozzles.

[0009] On this basis, an indicating device is arranged on the bellows.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: by setting a rotating device, when the rotating rocker rotates, it drives the connecting rod mechanism, and then the connecting rod mechanism drives the secondary air nozzle. Under the action of the connecting rod mechanism, the secondary air nozzle uses the rotating shaft as the rotating axis to realize rotation relative to the bellows, thereby changing the direction of the outlet airflow; when the rotating rocker rotates, it drives the connecting rod mechanism, and then the connecting rod mechanism drives the primary air nozzle. Under the action of the connecting rod mechanism, the primary air nozzle uses the rotating shaft as the rotating axis to realize rotation relative to the primary air nozzle pipe, thereby changing the direction of the outlet airflow In the direction, after the primary air nozzle and the secondary air nozzle are deflected in the direction of the furnace cross section, the direction of their outlet airflow will deviate from the center line of the wind box installation at the same angle. If the center lines of the four corner nozzles are deflected away from the center of the furnace at a certain angle, the diameter of the imaginary tangent circle will become larger; otherwise, it will become smaller. If the deflection angles of the four corner nozzles are different, the center point of the imaginary tangent circle will deviate from the center position of the furnace. In this way, the diameter and center position of the imaginary tangent circle formed by the burner airflow in the center of the furnace will change accordingly, thereby achieving the effect of adjusting the combustion conditions of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the arrangement structure of the secondary air nozzle and the primary air nozzle of Example 1;

[0012] Figure 2 It is a schematic diagram of the top view of the structure of the boiler burner of the utility model;

[0013] Figure 3 yes Figure 2 M-direction structural diagram;

[0014] Figure 4 yes Figure 3 AA structural diagram;

[0015] Figure 5 yes Figure 3 BB structural diagram;

[0016] Figure 6 This is a schematic diagram of the structure of the deflection m° of Example 1;

[0017] Figure 7 Schematic diagram of the arrangement structure of the secondary air nozzle and the primary air nozzle of Example 2;

[0018] Figure 8 is a schematic diagram of the top view of the boiler burner of Example 3;

[0019] In the figure: 1. bellows, 2. secondary air nozzle, 3. primary air nozzle, 4. primary air nozzle, 5. indicating device, 6. rotating rocker, 7. connecting rod mechanism, 8. rotating shaft. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Example 1

[0022] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The utility model discloses a boiler burner capable of changing the diameter and center position of a tangential circle, comprising a wind box 1 arranged at the four corners or four walls of a boiler furnace, wherein the wind box 1 is divided into compartments by a partition in the height direction, wherein a secondary air nozzle 2 and a primary air nozzle 3 are arranged in the compartment, wherein the secondary air nozzle 2 and the primary air nozzle 3 are connected to the wind box 1 respectively, wherein a rotating device is arranged on the wind box 1 for the secondary air nozzle 2 and the primary air nozzle 3, wherein the rotating device comprises a rotating rocker 6, a connecting rod mechanism 7 and a rotating shaft 8, wherein one end of the connecting rod mechanism 7 is rotatably connected to the rotating rocker 6, and the other end is rotatably connected to a The secondary air nozzle 3 and the secondary air nozzle 2, the primary air nozzle 3 is connected to the primary air nozzle pipe 4, the primary air nozzle 3 is connected to the primary air nozzle pipe 4 through the rotating shaft 8, the secondary air nozzle 2 is connected to the bellows 1 through the rotating shaft 8, the rotation of the rotary rocker 6 can be driven manually or by an electric actuator or a pneumatic actuator, the secondary air nozzle 2 and the primary air nozzle 3 are alternately arranged from bottom to top along the height direction of the furnace or similar nozzles are relatively concentrated and arranged in close proximity, the secondary air nozzle 2 adopts a single nozzle, or can be composed of a group of multiple nozzles, and an indicating device 5 is provided on the bellows 1.

[0023] The actual working principle is: the bellows 1 are arranged at the four corners of the boiler furnace, and the installation center line forms a certain angle with the diagonal of the quadrilateral of the furnace cross-section. The installation center lines of the four corner bellows form an imaginary tangent circle at the center of the furnace. The bellows 1 is divided into multiple compartments by partitions along the height direction. The secondary air nozzles 2 and the primary air nozzles 3 are arranged at intervals from bottom to top. The indicating device 5 engraved with the angle value is fixedly installed on the bellows 1, and the rotating rocker 6 is rotatably connected to the bellows 1 through its own shaft sleeve.

[0024] The primary air nozzle 4 is installed and fixed in a compartment of the wind box 1, the primary air nozzle 3 is connected to the primary air nozzle 4 through a rotating shaft 8, and the secondary air nozzle 2 is connected to the wind box 1 through a rotating shaft 8 and arranged in another compartment of the wind box 1. One end of the connecting rod mechanism 7 is rotatably connected to the rotating rocker 6, and the other end is rotatably connected to the primary air nozzle 3 and the secondary air nozzle 2.

[0025] Under normal working conditions, in the direction of the furnace cross section, the centerline direction of the primary air nozzle 3 and the secondary air nozzle 2 is the same as the installation centerline direction of the wind box 1, and the imaginary tangent circle formed by the centerline of the outlet airflow of the two nozzles is the imaginary tangent circle formed by the installation centerline of the wind box 1. When it is necessary to adjust the boiler combustion conditions, the diameter and center position of the imaginary tangent circle of the nozzle outlet airflow can be adjusted in the following way.

[0026] The rotation of the rotary rocker 6 can be achieved manually or by using an electric actuator or a pneumatic actuator. When the rotary rocker 6 rotates, it drives the connecting rod mechanism 7, and then the connecting rod mechanism 7 drives the primary air nozzle 3. Under the action of the connecting rod mechanism 7, the primary air nozzle 3 uses the rotating shaft 8 as the rotation axis to achieve rotation relative to the primary air nozzle 4, thereby changing the direction of the outlet airflow. The indicator device 5 can reflect the angle of the rotation deflection of the primary air nozzle 3, and the preferred deflection angle is ±5°.

[0027] When the rocker 6 rotates, the connecting rod mechanism 7 is driven, and then the connecting rod mechanism 7 drives the secondary air nozzle 2. Under the action of the connecting rod mechanism 7, the secondary air nozzle 2 uses the rotating shaft 8 as the rotation axis to achieve rotation relative to the wind box 1, thereby changing the direction of the outlet air flow. The indicator device 5 can reflect the angle of the rotation deflection of the secondary air nozzle 2, and the preferred deflection angle is ±15°.

[0028] refer to Figure 6 , after the primary air nozzle 3 and the secondary air nozzle 2 are deflected at an angle of m° in the furnace cross section direction, the outlet airflow direction will deviate from the installation center line of the wind box 1 at an angle of m°. The angle range of the primary air nozzle 3 is 0-5°, and the angle range of the secondary air nozzle 2 is 0-20°. Figure 5 If the center lines of the four corner nozzles are all deflected away from the center of the furnace at a certain angle, the diameter of the imaginary tangent circle will become larger; otherwise, it will become smaller. If the deflection angles of the four corner nozzles are different, the center point of the imaginary tangent circle will deviate from the center of the furnace. Through the above adjustment method, the diameter and center position of the imaginary tangent circle formed by the burner airflow in the center of the furnace will change accordingly, thereby achieving the effect of adjusting the boiler combustion condition.

[0029] Example 2

[0030] refer to Figure 7, is a schematic diagram of another structure of a boiler burner capable of changing the diameter and center position of the tangential circle. The difference between this embodiment and embodiment 1 is that along the height direction of the wind box 1, some primary air nozzles 3 are arranged adjacent to each other up and down, and there is no secondary air nozzle 2 in the middle. The other structures are the same as embodiment 1.

[0031] Example 3

[0032] refer to Figure 8 , is a schematic diagram of another structure of a boiler burner capable of changing the diameter and center position of the tangential circle. The difference between this embodiment and embodiment 1 is that the wind box 1 is arranged on the four water-cooled walls of the boiler furnace. The other structures are the same as those of embodiment 1.

[0033] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation", "screwing", "pad installation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical 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. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0035] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A boiler burner capable of changing the diameter and center position of a tangential circle, comprising a wind box (1) arranged at the four corners or four walls of a boiler furnace, characterized in that: The wind box (1) is divided into compartments by partitions along the height direction, and a secondary air nozzle (2) and a primary air nozzle (3) are arranged in the compartments. The secondary air nozzle (2) and the primary air nozzle (3) are respectively connected to the wind box (1). The wind boxes (1) of the secondary air nozzle (2) and the primary air nozzle (3) are both provided with a rotating device, and the rotating device comprises a rotating rocker (6), a connecting rod mechanism (7) and a rotating shaft (8).

2. The boiler burner capable of changing the diameter and center position of the tangential circle according to claim 1, characterized in that: The rotating rocker (6) is connected to the bellows (1); one end of the connecting rod mechanism (7) is rotationally connected to the rotating rocker (6), and the other end is rotationally connected to the primary air nozzle (3) and the secondary air nozzle (2).

3. The boiler burner capable of changing the diameter and center position of the tangential circle according to claim 1, characterized in that: The primary air nozzle (3) is connected to a primary air nozzle pipe (4), the primary air nozzle (3) and the primary air nozzle pipe (4) are connected via a rotating shaft (8), and the secondary air nozzle (2) is connected to the wind box (1) via the rotating shaft (8).

4. The boiler burner capable of changing the diameter and center position of the tangential circle according to claim 1, characterized in that: The rotation of the rotary rocker (6) can be driven manually or by an electric actuator or a pneumatic actuator.

5. The boiler burner capable of changing the diameter and center position of the tangential circle according to claim 1, characterized in that: The secondary air nozzles (2) and the primary air nozzles (3) are arranged alternately and spaced from bottom to top along the height direction of the furnace, or similar nozzles are relatively concentrated and arranged in close proximity. The secondary air nozzles (2) are single nozzles, or are composed of a group of multiple nozzles.

6. The boiler burner capable of changing the diameter and center position of the tangential circle according to claim 1, characterized in that: The bellows (1) is provided with an indicating device (5).

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