Pulverized coal distributor capable of adjusting powder amount deviation

Abstract

The utility model discloses a pulverized coal distributor capable of adjusting pulverized coal amount deviation, the pulverized coal distributor is horizontally arranged, the inlet end of the pulverized coal distributor is a pulverized coal feeding main path, and the outlet end of the pulverized coal distributor is provided with two horizontal pulverized coal feeding branch paths which are parallel in the vertical direction; a flow guide block is arranged in the pulverized coal distributor pipeline and fixed to the top side and / or the bottom side of the shell through an adjusting pull rod, and the adjusting pull rod can stretch out and draw back in the vertical direction of the pulverized coal distributor. The principle of inertial separation is utilized, when pulverized coal enters the pulverized coal distributor, the relative position of the flow guide block is changed, and after pulverized primary air impacts the flow guide block, dense-phase pulverized coal and dilute-phase pulverized coal are separated under the action of inertia, so that the amount of pulverized coal entering each branch pipe is adjusted; and the primary air speed in each branch pipe is close, so that the situation that the primary air speed is too high while the amount of pulverized coal is reduced is avoided, and safe operation of a boiler system is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of power plant boilers and industrial boilers, and in particular relates to a pulverized coal distributor with adjustable pulverized coal quantity deviation. Background Technology

[0002] In large pulverized coal boilers, raw coal is ground by a coal mill and then fed into the main pulverized coal feeding line by primary air. The coal-laden airflow is then distributed to the branch pulverized coal feeding lines by a distributor. Figure 1 As shown.

[0003] The uniformity of the amount of pulverized coal entering the pulverized coal feeding branch after passing through the distributor is crucial for boiler operation. Deviations in the pulverized coal quantity in the branch pipes can cause the following problems:

[0004] 1. The biggest danger of powder quantity deviation is that the heating surface has a large thermal deviation, and the tube wall is prone to overheating;

[0005] 2. Uneven powder content leads to uneven heat load inside the furnace, making localized coking prone to occur on the water-cooled walls;

[0006] 3. Uneven powder quantity leads to uneven NOx field distribution at the furnace outlet, resulting in uneven NOx concentration entering the denitrification unit, local NOx concentration exceeding the standard, increased ammonia injection into the denitrification unit, and increased risk of ammonium bisulfate blockage in the air preheater;

[0007] 4. If the burner with a large amount of pulverized coal is located on both side walls, the O2 in the side wall area will be extremely low and the CO will be extremely high, which will increase the risk of high-temperature corrosion of the water-cooled side wall.

[0008] A schematic diagram of a conventional pulverized coal distributor is shown below. Figure 2 , Figure 3 As shown. Pulverized coal enters the pulverized coal distributor from the main outlet pipe of the coal mill in the direction of the arrow. After being distributed in the distributor, it enters the branch pipes. Due to the different resistances in each branch pipe, the amount of pulverized coal in each branch pipe is easily unevenly distributed. Partial distribution adjustment devices (such as...) Figure 3 (As shown) Only a rotatable deflector is installed, but the deflector is not adjustable in the horizontal position; only its angle can be rotated. The deflector is prone to wear and requires frequent replacement, and it is generally a fixed installation, resulting in a large amount of replacement work. Because each site's conditions are different, a distributor with a deflector installed in the same location cannot be used.

[0009] In view of the aforementioned potential problems, it is essential to invent a coal powder distributor that can move horizontally, is easy to replace, and is suitable for various projects. Utility Model Content

[0010] The utility model discloses a purpose at: in order to overcome prior art problems, disclose a kind of adjustable coal powder deviation's coal powder distributor, by the structural setting of this coal powder distributor, the movable adjustable of vertical position and horizontal position of flow guide block in coal powder distributor is realized, to solve the technical problem of the limited application scene of traditional structure.

[0011] The utility model discloses a purpose to realize by the following technical scheme:

[0012] A kind of adjustable coal powder deviation's coal powder distributor, the coal powder distributor is horizontally arranged, and the coal powder distributor inlet end is a main powder conveying path, and the coal powder distributor outlet end is equipped with two horizontal powder conveying branch paths in vertical direction parallel;

[0013] The coal powder distributor pipeline is equipped with flow guide block, the flow guide block is fixed with the top side and / or bottom side of shell by adjusting pull rod, and the adjusting pull rod can be telescopic in the vertical direction of the coal powder distributor.

[0014] According to one preferred embodiment, the top or bottom outside of the shell of the coal powder distributor is to be horizontally arranged with several adjusting hole positions, and the adjusting pull rod is arranged through the adjusting hole position.

[0015] According to one preferred embodiment, the adjusting pull rod is selected to be arranged in each adjusting hole position to complete the distance adjustment of flow guide block and the branch point of two powder conveying branch paths.

[0016] According to one preferred embodiment, the inner wall of the adjusting hole position is provided with an internal thread structure, and the outer wall of the adjusting pull rod is provided with an external thread structure, and the adjusting pull rod and the adjusting hole position are connected through thread structure cooperation.

[0017] According to one preferred embodiment, each adjusting hole position without adjusting pull rod is plugged by setting a cap.

[0018] According to one preferred embodiment, the flow guide block is a vertebral body structure.

[0019] According to one preferred embodiment, the bottom surface of the flow guide block vertebral body structure is a horizontal surface, and the inclined surface of the flow guide block vertebral body structure faces the main powder conveying path direction.

[0020] According to one preferred embodiment, the bottom surface of the flow guide block is connected with the adjusting pull rod through thread structure cooperation.

[0021] According to one preferred embodiment, the side wall of the adjusting pull rod is provided with a scale mark along the axial direction of the rod body.

[0022] According to one preferred embodiment, the end of the adjusting pull rod is provided with a flow guide block orientation mark.

[0023] The foregoing main scheme and each further selected scheme of the utility model can be freely combined to form multiple schemes, all of which are the schemes that can be adopted and claimed by the utility model. The person skilled in the art can understand multiple combinations according to the prior art and common knowledge after understanding the scheme of the utility model, all of which are the technical schemes claimed by the utility model, and are not listed exhaustively here.

[0024] The utility model discloses the beneficial effects of:

[0025] Under the premise that the means such as boiler combustion system adjustment can not effectively solve the steam temperature deviation, by adjusting the device, the left and right side steam temperature deviation of the boiler tends to be in the safe range. Before adjustment, it is necessary to determine that the powder deviation is caused by uneven powder output of some coal mills, and then adjust the adjusting device of the application. After the scheme is adopted, the uneven distribution of boiler heat load caused by the difference between equipment performance and arrangement can be effectively adjusted, the uneven distribution of boiler heat load and the overheating pipe explosion of heating surface are prevented. The position with good adjustment effect can be installed according to the actual selection of the project site, the replacement frequency of internal components is reduced, the threaded form is adopted for sealing, and the coal powder outflow is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the working principle diagram of a large coal powder boiler coal powder distributor;

[0027] Figure 2 is the working principle diagram of a conventional coal powder distributor;

[0028] Figure 3 is the working principle diagram of a conventional coal powder distributor;

[0029] Figure 4 is the principle structure schematic diagram of the coal powder distributor of the application;

[0030] Among them, 1 is a shell, 2 is an adjusting hole, 3 is an adjusting pull rod, 4 is a flow guide block, and 5 is a branch point. DETAILED DESCRIPTION

[0031] The embodiments of the utility model will be described below through specific concrete examples, and the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied through another different specific embodiment, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0032] It should be noted that like numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it should not require further defining and explaining in subsequent views.

[0033] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly placed when the utility model product is used, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In addition, the utility model points out that in the utility model, if the specific structures, connection relationships, position relationships, power source relationships and the like are not specifically written, the structures, connection relationships, position relationships, power source relationships and the like involved in the utility model are all known by those skilled in the art on the basis of the prior art without creative labor.

[0037] Embodiment

[0038] Reference Figure 1 As shown in the figure, a pulverized coal distributor capable of adjusting the pulverized coal deviation is shown, the pulverized coal distributor is horizontally arranged, the inlet end of the pulverized coal distributor is a main powder conveying path, and the outlet end of the pulverized coal distributor is provided with two horizontal powder conveying branch paths parallel in the vertical direction.

[0039] Preferably, the pulverized coal distributor pipe is provided with a flow guide block 4, which is fixed to the top and / or bottom side of the housing 1 via an adjusting rod 3, and the adjusting rod 3 can extend and retract in the vertical direction of the pulverized coal distributor.

[0040] Preferably, the outer side of the top or bottom of the housing 1 of the pulverized coal distributor is provided with several adjustment holes 2 in a horizontal direction, and the adjustment rod 3 is provided through the adjustment holes 2.

[0041] Furthermore, the adjusting rod 3 is selected to be set in each adjusting hole 2 to complete the distance adjustment between the guide block 4 and the branch point 5 of the two powder delivery branches.

[0042] Preferably, the adjustable position of the adjusting rod 3 is between 0.5d and 1.5d from the foremost end of the guide block 4 to the branch point 5. An excessively long distance will cause the air and powder to separate and return to the powder pipe, while an excessively short distance will cause the branch pipe to be blocked by the guide block 4. At the appropriate distance, it achieves the effect of adjusting the powder without adjusting the airflow. Changing the position of the guide block 4 can achieve the separation angle between the dense and dilute phases, and the position of the guide block 4 can be adjusted on-site as needed.

[0043] Preferably, the inner wall of the adjusting hole 2 is provided with an internal thread structure, and the outer wall of the adjusting rod 3 is provided with an external thread structure. The adjusting rod 3 and the adjusting hole 2 are connected by the threaded structure. The user can adjust the position of the adjusting rod 3 in the vertical direction by turning it, thereby adjusting the position of the guide block 4 in the vertical direction.

[0044] Furthermore, each adjustment hole 2 that is not inserted into the adjustment rod 3 is sealed by setting a cap.

[0045] Preferably, the guide block 4 is a cone-shaped structure. Further, the bottom surface of the cone-shaped structure of the guide block 4 is horizontal, and the inclined surface of the cone-shaped structure faces the main coal feeding path. When the primary air carrying coal impacts the inclined surface of the guide block, due to inertia, the dense and dilute phases of coal are separated, thereby regulating the amount of coal entering each branch pipe.

[0046] Preferably, this application can use a triangular-shaped cone block. The impact of pulverized coal particles on the inclined surface causes the particles to change direction, separating the pulverized coal flow into a dense phase and a dilute phase, thus altering the distribution state of the pulverized coal. The tail of the guide block is designed with a protrusion to prevent the formation of a Karman vortex street at the tail of the backflow block during airflow distribution. Guide blocks of different materials and shapes can be replaced according to on-site operating conditions. The cone block design allows for longer service life, reducing the need for frequent replacements due to wear.

[0047] Preferably, the bottom surface of the guide block 4 is connected to the adjusting rod 3 via a threaded connection. This facilitates the assembly and disassembly of the guide block 4 and the adjusting rod 3.

[0048] Preferably, the side wall of the adjusting pull rod 3 is provided with scale marks in the axial direction of the rod body, thereby helping the operator to control the position of the flow guide block 4.

[0049] Further, the end of the adjusting pull rod 3 is provided with a flow guide block orientation mark. That is, when the operator adjusts the pull rod 3, by observing the flow guide block orientation mark, it can be ensured that the orientation of the flow guide block 4 in the pulverized coal distributor is always the same after each adjustment, so that the orientation of the flow guide block 4 cannot be changed uncontrollably after the adjusting pull rod 3 is twisted.

[0050] The present application utilizes the principle of inertial separation. When the pulverized coal enters the pulverized coal distributor, by changing the relative position of the flow guide block, when the pulverized coal is impacted by the primary air, due to the effect of inertia, the separation of dense phase and dilute phase pulverized coal is realized, thereby adjusting the amount of pulverized coal entering each branch pipe; and the primary air speed in each branch pipe can be ensured to be close, so that the primary air speed is not excessively reduced while reducing the amount of pulverized coal, ensuring the safe operation of the boiler system.

[0051] The present pulverized coal distributor can change the strength of the adjusting effect by changing the horizontal position of the flow guide block. If a relatively strong adjusting effect is required, the flow guide plate needs to be close to the branch point, and if a relatively small adjusting effect is required, the flow guide plate needs to be slightly far from the branch point.

[0052] The present pulverized coal distributor is provided with a plurality of adjusting hole positions in the horizontal direction, and the best adjusting hole position can be selected according to the actual situation of the project site, and the remaining hole positions are sealed by caps to avoid the outflow of pulverized coal. The pull rod is in the form of a threaded rod, and the adjusting hole position also has threads, and the connection between the pull rod and the flow guide block is realized by screwing the pull rod, which is simple and convenient, and at the same time guarantees the sealing problem of the pull rod and the adjusting hole position. The flow guide block adopts a conical body with a triangular cross section, which can prolong the service life and reduce the frequency of replacement.

[0053] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A coal powder distributor capable of adjusting a powder amount deviation, characterized by, The coal powder distributor is horizontally arranged, an inlet end of the coal powder distributor is a main powder feeding path, and an outlet end of the coal powder distributor is provided with two horizontal powder feeding branch paths parallel in the vertical direction. The coal powder distributor is provided with a flow guide block (4) in the pipeline, the flow guide block (4) is fixed to the top side and / or the bottom side of the shell (1) through an adjusting pull rod (3), and the adjusting pull rod (3) can be telescopically moved in the vertical direction of the coal powder distributor.

2. The coal distributor according to claim 1, wherein The top or bottom side of the shell (1) of the coal powder distributor is provided with a plurality of adjusting hole positions (2) in the horizontal direction, and the adjusting pull rod (3) is arranged through the adjusting hole positions (2).

3. The coal distributor according to claim 2, wherein The adjusting pull rod (3) is arranged in each adjusting hole position (2) to adjust the distance between the flow guide block (4) and the branch points (5) of the two powder feeding branch paths.

4. The coal distributor according to claim 2, wherein The inner side wall of the adjusting hole position (2) is provided with an internal thread structure, the outer side wall of the adjusting pull rod (3) is provided with an external thread structure, and the adjusting pull rod (3) and the adjusting hole position (2) are connected through the thread structure.

5. The coal distributor according to claim 2, wherein Each adjusting hole position (2) without the adjusting pull rod (3) is provided with a cap to block the corresponding hole position.

6. The coal distributor according to claim 1, wherein The flow guide block (4) is a vertebral body structure.

7. The coal distributor according to claim 6, wherein The bottom surface of the vertebral body structure of the flow guide block (4) is a horizontal surface, and the inclined surface of the vertebral body structure of the flow guide block (4) faces the main powder feeding path.

8. The coal distributor according to claim 7, wherein The bottom surface of the flow guide block (4) is connected to the adjusting pull rod (3) through the thread structure.

9. The coal distributor according to claim 1, wherein The side wall of the adjusting pull rod (3) is provided with a scale mark in the axial direction of the rod body.

10. The coal distributor according to claim 1, wherein The end of the adjusting pull rod (3) is provided with a flow guide block (4) direction mark.

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