Pulverized coal airflow flow adjusting device

Abstract

The embodiment of the invention provides a pulverized coal airflow flow adjusting device. The adjusting device comprises a shell and an adjusting structure. The shell is provided with an airflow channel, an air inlet and an air outlet, wherein the air inlet and the air outlet are communicated with the airflow channel. Pulverized coal airflow enters the airflow channel through the air inlet; the adjusting structure is arranged on the shell, and the position of the adjusting structure corresponds to the position of the air outlet; the adjusting structure is used for adjusting the cross sectional area of the airflow channel so as to adjust the flow of pulverized coal airflow; and the adjusted pulverized coal airflow flows to the air outlet. According to the pulverized coal conveying pipeline, the actual control area of the cross section of the airflow channel is changed through the adjusting structure so as to control the passing amount of pulverized coal airflow, and therefore the deviation of the pulverized coal airflow flow between the pulverized coal conveying pipelines can be adjusted.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of air duct modification, and specifically relate to a pulverized coal airflow regulating device. Background Art

[0002] The pulverizing system is an indispensable part of the pulverized coal boiler system. The medium-speed pulverizer direct-blowing pulverizing system is one of the common and widely used pulverizing systems in power plant coal-fired boilers. The operating status of the system has an important impact on the normal operation of coal-fired boilers.

[0003] The flow deviation of the pulverized coal airflow between the powder delivery pipes in the pulverizing system is an important parameter during the operation of the medium-speed mill direct-blowing pulverizing system. If there is an unbalanced flow distribution problem between the pulverized coal pipelines, it will often lead to a series of problems in the boiler furnace, such as unstable combustion, large thermal load deviation, and local high-temperature corrosion. Existing pulverized coal distributors generally have problems such as unadjustable flow, poor distribution performance, large size, easy wear and inconvenient maintenance, which makes it difficult to meet the current high-parameter coal-fired boilers' pursuit of compact layout structure and efficient and stable combustion.

[0004] Therefore, how to solve the above problems has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a pulverized coal air flow regulating device.

[0006] According to a first aspect of an embodiment of the present disclosure, a pulverized coal airflow regulating device is provided, the regulating device comprising a housing and a regulating structure; the housing has an airflow channel, and an air inlet and an air outlet communicated with the airflow channel; the pulverized coal airflow enters the airflow channel through the air inlet;

[0007] The regulating structure is arranged on the shell, and the regulating structure corresponds to the position of the air outlet; the regulating structure is used to adjust the cross-sectional area of ​​the airflow channel to adjust the flow of the coal powder airflow; the adjusted coal powder airflow flows to the air outlet.

[0008] Optionally, there are multiple adjustment structures and multiple air outlets; the multiple adjustment structures are arranged at intervals on the shell, and the multiple adjustment structures are arranged in a one-to-one correspondence with the multiple air outlets.

[0009] Optionally, the adjustment structure includes two adjustment units arranged opposite to each other; each of the adjustment units includes a handle, a rotating structure and an adjustment baffle; the rotating structure is rotatably connected to the housing; the handle is arranged at a first end of the rotating structure, and the adjustment baffle is arranged at a second end of the rotating structure;

[0010] The handles corresponding to the two adjustment units are used to drive the adjustment baffle to rotate through the rotation structure respectively, so as to jointly adjust the cross-sectional area of ​​the airflow channel.

[0011] Optionally, the rotating structure includes a rotating shaft and a sealing seat; the sealing seat is arranged on the shell, and the sealing seat has an axial hole; the rotating shaft is passed through the axial hole and is rotatably connected to the sealing seat; wherein the second end of the rotating shaft extends into the shell through the axial hole and is connected to the adjusting baffle, and the first end of the rotating shaft is connected to the handle.

[0012] Optionally, the adjustment structure further includes a bracket disposed on the housing, and the bracket has a slide groove;

[0013] The handle comprises a handle body connected to the first end of the rotating structure, and a protrusion arranged on the handle body; the handle is slidably connected to the bracket through the sliding cooperation between the protrusion and the slide groove;

[0014] The handle adjusts the angle between the adjustment baffle and the cross section of the airflow channel by sliding the protrusion in the slide groove.

[0015] Optionally, the adjustment structure further comprises a mounting plate, wherein the two adjustment units arranged opposite to each other are arranged on the mounting plate; and a mounting hole is opened on the housing;

[0016] Wherein, the adjustment structure is detachably mounted on the housing through the adaption installation of the mounting plate and the mounting hole.

[0017] The beneficial effects of the embodiments of the present disclosure include:

[0018] In the present disclosure, the actual control area of ​​the cross section of the airflow channel is changed by adjusting the structure to control the amount of coal powder airflow passing through, so that the deviation of the coal powder airflow flow between each powder delivery pipeline can be adjusted. Furthermore, when the deviation of the coal powder airflow flow between each powder delivery pipeline can be controlled within a preset range, the purpose of optimizing the combustion in the boiler can be achieved, and the local overheating problem caused by the flame cutting circle deviation and the heat load deviation in the furnace can be effectively reduced. At the same time, the equipment is designed to be directly arranged on the shell of the upper part of the coal mill rotary separator for flow regulation in view of the limited space conditions for the layout of the pulverizing system of some coal-fired power plants, which occupies a small space and is convenient for transformation and layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure diagram of a pulverized coal airflow regulating device according to an embodiment of the present disclosure is shown; wherein a top view of the regulating device is shown;

[0020] Figure 2 It is a structural schematic diagram of a coal powder airflow regulating device according to another embodiment of the present disclosure;

[0021] Figure 3 It is a structural schematic diagram of an adjustment structure of an embodiment of the present disclosure; wherein a side view schematic diagram of the adjustment device is shown;

[0022] Figure 4 It is a schematic diagram of the structure of another adjustment structure of an embodiment of the present disclosure; wherein a side view schematic diagram of the adjustment device is shown;

[0023] Figure 5 It is a schematic diagram of a structure of an adjustment structure of an embodiment of the present disclosure; wherein a schematic diagram of a top view of the adjustment device is shown;

[0024] Figure 6 The present invention is a schematic structural diagram of a coal powder rotary separator according to an embodiment of the present invention.

[0025] 10. Casing; 100. Coal powder airflow regulating device; 200. Separator stationary blades; 300. Separator moving blades; 110. Adjustment structure; 120. Air flow channel; 130. Air outlet; 111. Mounting plate; 112. Handle; 113. Rotating shaft; 114. Sealing seat; 115. Adjustment baffle; 116. Bracket; 117. Sliding seat. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. 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 cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0029] like Figure 1-5 As shown, a pulverized coal airflow regulating device 100 includes a housing and a regulating structure 110. The housing has an airflow channel 120, and an air inlet and an air outlet 130 connected to the airflow channel 120. The pulverized coal airflow enters the airflow channel 120 through the air inlet.

[0030] The regulating structure 110 is arranged on the housing, and the position of the regulating structure 110 corresponds to the position of the gas outlet 130. The regulating structure 110 is used to adjust the cross-sectional area of ​​the gas flow channel 120 to adjust the flow rate of the coal powder gas flow, and the adjusted coal powder gas flow flows to the gas outlet 130. The regulating device is arranged in front of the coal mill outlet at the upper part of the coal mill separator.

[0031] In some embodiments, the pulverized coal airflow regulating device 100 is disposed at the upper end of the coal mill rotary separator.

[0032] In some embodiments, the gas outlet 130 is connected to a powder delivery pipeline.

[0033] In the present disclosure, the actual control area of ​​the cross section of the airflow channel 120 is changed by adjusting the structure 110 to control the amount of coal powder airflow passing through, so that the deviation of the coal powder airflow flow between each powder delivery pipeline can be adjusted. Further, when the deviation of the coal powder airflow flow between each powder delivery pipeline can be controlled within a preset range, the purpose of optimizing the combustion in the boiler can be achieved, and the local overheating problem caused by the flame cutting circle deviation and the heat load deviation in the furnace can be effectively reduced. At the same time, the equipment is designed to be directly arranged on the shell of the upper part of the coal mill rotary separator for flow regulation in view of the limited space conditions for the layout of the pulverizing system of some coal-fired power plants, which occupies a small space and is convenient for transformation and layout.

[0034] In some embodiments, there are multiple adjustment structures 110 and multiple air outlets 130. The multiple adjustment structures 110 are disposed at intervals on the housing, and the multiple adjustment structures 110 and the multiple air outlets 130 are disposed one by one correspondingly.

[0035] In the present disclosure, by providing multiple adjustment structures 110 and multiple air outlets 130, it is possible to achieve independent adjustment of the coal powder airflow in different areas. This makes the flow control of the entire device more precise, and the flow of each air outlet 130 can be adjusted as needed, thereby achieving more sophisticated flow management. The provision of multiple adjustment structures 110 and air outlets 130 can ensure that the distribution of the coal powder airflow in the housing is more uniform, avoid excessive or insufficient local flow, and improve the overall flow efficiency and stability.

[0036] In some embodiments, the adjustment structure 110 includes two adjustment units arranged opposite to each other, each adjustment unit includes a handle 112, a rotating structure and an adjustment baffle 115, the rotating structure is rotatably connected to the shell, the handle 112 is arranged at the first end of the rotating structure, and the adjustment baffle 115 is arranged at the second end of the rotating structure.

[0037] The handles 112 corresponding to the two adjustment units are used to drive the adjustment baffle 115 to rotate through the rotation structure, so as to jointly adjust the cross-sectional area of ​​the airflow channel 120 .

[0038] In the present disclosure, two opposite adjustment units are provided to adjust both sides of the airflow channel 120 simultaneously, so as to accurately control the cross-sectional area of ​​the airflow channel 120 and ensure uniform distribution of the airflow. Double-sided adjustment can reduce airflow deflection or unevenness caused by single-sided adjustment, and improve the accuracy and stability of flow regulation.

[0039] In some embodiments, the rotating structure includes a rotating shaft 113 and a sealing seat 114, wherein the sealing seat 114 is disposed in the housing and has an axial hole. The rotating shaft 113 is passed through the axial hole and is rotatably connected to the sealing seat 114. The second end of the rotating shaft 113 extends into the housing through the axial hole and is connected to the adjusting baffle 115, and the first end of the rotating shaft 113 is connected to the handle 112.

[0040] The present invention can effectively prevent dust in the coal powder airflow from entering the rotating structure by setting the sealing seat 114 and the shaft hole, thereby ensuring the long-term stable operation of the rotating structure. The rotating shaft 113 is rotatably connected through the shaft hole of the sealing seat 114, thereby ensuring the stability and reliability of the rotation, reducing friction and wear, and extending the service life of the device.

[0041] In some embodiments, the adjustment structure 110 further includes a bracket 116 disposed on the housing, and the bracket 116 has a slide groove. The handle 112 includes a handle body connected to the first end of the rotating structure, and a protrusion disposed on the handle body, and the handle 112 is slidably connected to the bracket 116 through the sliding cooperation between the protrusion and the slide groove.

[0042] The handle 112 adjusts the angle between the baffle 115 and the cross section of the airflow channel 120 by sliding the protrusion in the slide groove. In some embodiments, the protrusion is a threaded connector threadedly connected to the handle body.

[0043] In the present disclosure, by providing the bracket 116 and the slide groove, the handle 112 can slide in the slide groove to achieve precise adjustment of the angle between the adjustment baffle 115 and the cross section of the air flow channel 120, so that the flow regulation is more precise and can adapt to different flow requirements. The matching design of the slide groove and the protrusion allows the handle 112 to be fine-tuned within a certain range to ensure the accuracy and stability of the flow regulation. The design of the handle 112 allows the operator to directly adjust manually without the need for complex mechanical or electronic control systems, thereby simplifying the operation process.

[0044] In some embodiments, the adjustment structure 110 further includes a mounting plate 111, wherein two adjustment units arranged opposite to each other are arranged on the mounting plate 111, and a mounting hole is provided on the housing. The adjustment structure 110 is detachably mounted on the housing through the matching mounting of the mounting plate 111 and the mounting hole.

[0045] In the present disclosure, the detachable design makes the installation and disassembly of the adjustment structure 110 more convenient, simplifies the maintenance process, and improves work efficiency. The detachable design allows the device to be adjusted according to different working conditions and requirements, and has a wide range of applicability.

[0046] A specific embodiment provided by the present disclosure includes:

[0047] Reference Figures 1 to 5 The pulverized coal airflow regulating device 100 disclosed in the present invention is arranged at the upper part of the pulverized coal rotary separator of the coal mill. The pulverized coal airflow regulating device 100 includes a shell, a handle 112, a bracket 116, a sliding seat 117, a rotating shaft 113, an adjusting baffle 115 and a sealing seat 114.

[0048] The shell of the pulverized coal air flow regulating device 100 is provided with six regulating structures 110, such as Figure 2 As shown, six adjustment mechanisms are arranged on the shell at a center spacing around the shell.

[0049] The adjustment structure 110 is detachably connected to the housing via a mounting plate 111. A shaft 113 is rotatably disposed on the housing, wherein an adjustment baffle 115 and a sliding seat 117 are disposed at one end of the shaft 113 located inside the housing, and a handle 112 is disposed at one end of the shaft 113 located outside the housing.

[0050] like Figure 3-5As shown, the adjusting baffle 115 and the handle 112 are arranged at both ends of the rotating shaft 113, and the rotating shaft 113 is rotatably connected to the housing, wherein the rotation angle of the rotating shaft 113 is limited by the bracket 116. During operation, the rotating shaft 113 and the adjusting baffle 115 are driven to rotate by rotating the handle 112 to change the angle between the adjusting baffle 115 and the cross section of the airflow channel 120, so as to control the actual control area of ​​the cross section of the coal powder airflow channel 120.

[0051] The bracket 116 has a slide groove, and the handle 112 is provided with a protrusion, and the handle 112 is slidably connected with the bracket 116 through the sliding cooperation between the protrusion and the slide groove. The handle 112 adjusts the angle between the baffle 115 and the cross section of the airflow channel 120 by sliding the protrusion in the slide groove.

[0052] The sealing seat 114 is welded on the housing and sleeved on the rotating shaft 113 . The sealing seat 114 is used to prevent dust from entering the rotating shaft 113 , which would cause the quality of the lubricating oil in the rotating shaft 113 to deteriorate and cause wear on the rotating shaft 113 itself.

[0053] One end of the handle 112 is connected to the rotating shaft 113, and the other end of the handle 112 is connected to the slide groove of the bracket 116 by bolts, wherein the rotation angle range of the handle 112 is controlled by the bracket 116 to control the angle range between the baffle 115 and the cross-section of the airflow channel 120.

[0054] The specific working process of the pulverized coal air flow regulating device 100 disclosed in the present invention is as follows:

[0055] like Figure 6 As shown, the pulverized coal gas flows into the outer casing 10 of the pulverized coal rotary separator, and enters the airflow channel 120 of the pulverized coal gas flow regulating device 100 through the separator stationary blades 200 and the separator moving blades 300 in sequence. Before the outlet of the airflow channel 120, the pulverized coal gas flow is controlled by the regulating structure 110 and output. The output pulverized coal enters the powder delivery pipeline through the coal mill outlet.

[0056] The pulverized coal airflow regulating device 100 disclosed in the present invention is arranged before the outlet of the pulverizer at the upper part of the pulverizer rotary separator. In specific operation, the actual control area of ​​the cross section of the airflow channel 120 is changed by adjusting the regulating baffle 115 in the regulating structure 110, and the amount of pulverized coal airflow is controlled to adjust the deviation of the pulverized coal airflow flow between each powder pipe, so that the deviation of the pulverized coal airflow flow between each powder delivery pipe can be controlled within ±10%, so as to achieve the purpose of optimizing the combustion in the boiler, and effectively reduce the flame cutting circle deviation in the furnace, and the local over-temperature problem caused by the heat load deviation. At the same time, the equipment is designed to be directly arranged on the upper shell of the pulverizer rotary separator for flow regulation in view of the limited space conditions for the pulverizing system of some coal-fired power plants, which occupies a small space and is convenient for transformation and layout.

[0057] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A pulverized coal airflow regulating device, characterized in that: The regulating device comprises a housing and a regulating structure; the housing has an airflow channel, and an air inlet and an air outlet communicated with the airflow channel; the coal powder airflow enters the airflow channel through the air inlet; The regulating structure is arranged on the shell, and the regulating structure corresponds to the position of the air outlet; the regulating structure is used to adjust the cross-sectional area of ​​the airflow channel to adjust the flow of the coal powder airflow; the adjusted coal powder airflow flows to the air outlet.

2. A pulverized coal air flow regulating device according to claim 1, characterized in that: There are a plurality of the regulating structures and a plurality of the air outlets; the plurality of the regulating structures are arranged at intervals on the shell, and the plurality of the regulating structures and the plurality of the air outlets are arranged in a one-to-one correspondence.

3. A pulverized coal airflow regulating device according to claim 1 or 2, characterized in that: The adjustment structure comprises two adjustment units arranged opposite to each other; each of the adjustment units comprises a handle, a rotating structure and an adjustment baffle; the rotating structure is rotatably connected to the housing; the handle is arranged at a first end of the rotating structure, and the adjustment baffle is arranged at a second end of the rotating structure; Wherein, the handles corresponding to the two adjustment units are used to drive the adjustment baffle to rotate respectively through the rotation structure, so as to jointly adjust the cross-sectional area of ​​the airflow channel.

4. A pulverized coal airflow regulating device according to claim 3, characterized in that: The rotating structure includes a rotating shaft and a sealing seat; the sealing seat is arranged on the shell, and the sealing seat has an axial hole; the rotating shaft is passed through the axial hole and is rotatably connected to the sealing seat; wherein the second end of the rotating shaft extends into the shell through the axial hole and is connected to the adjusting baffle, and the first end of the rotating shaft is connected to the handle.

5. The pulverized coal air flow regulating device according to claim 3, characterized in that: The adjustment structure further comprises a bracket arranged on the housing, wherein the bracket has a slide groove; The handle comprises a handle body connected to the first end of the rotating structure, and a protrusion arranged on the handle body; the handle is slidably connected to the bracket through the sliding cooperation between the protrusion and the slide groove; Wherein, the handle adjusts the angle between the adjustment baffle and the cross section of the airflow channel by sliding the protrusion in the slide groove.

6. The pulverized coal air flow regulating device according to claim 3, characterized in that: The adjustment structure further comprises a mounting plate, wherein the two adjustment units arranged opposite to each other are arranged on the mounting plate; a mounting hole is provided on the housing; Wherein, the adjustment structure is detachably mounted on the housing through the adaption installation of the mounting plate and the mounting hole.

Images