Fluidized pulverized coal pipeline flow velocity adjusting device

Abstract

The utility model discloses a fluidization type pulverized coal pipeline flow speed adjusting device, and relates to the technical field of adjusting systems. The fluidization type pulverized coal pipeline flow speed adjusting device comprises a pipe section, flange plates are arranged at the two ends of the pipe section, a plurality of guide pipes are connected to the outer side of the pipe section, the guide pipes are connected with fixing plates, the fixing plates wrap the guide pipes, guide grooves are formed in the upper portions of the fixing plates in the extending direction of the guide pipes, and the guide grooves are communicated with the interiors of the guide pipes. The upper portion of the fixing plate is connected with a fixing shell. When the adjusting device is used, zero resistance can be achieved at the minimum, the wind speed leveling function is achieved, meanwhile, the added value of resistance of a powder pipe system can be reduced to the maximum extent, due to the fact that the resistance elements are in a comb tooth shape, even if the adjusting device is completely turned off, most pulverized coal can pass through normally, and a primary powder pipe cannot be blocked; therefore, the safe operation of the coal pulverizing system is ensured.

Description

Technical Field

[0001] The utility model relates to the field of regulating systems, and in particular to a fluidized coal powder pipeline flow rate regulating device. Background Art

[0002] The movement of pulverized coal particles in the primary air pulverized coal duct of a power station boiler is a very complex gas-solid two-phase flow. The online and accurate measurement of flow parameters such as its concentration, velocity, and fineness has always been a cutting-edge issue and difficulty in the field of engineering technology in the industry.

[0003] If the air and powder distribution between the burners is uneven, it will directly affect the ignition and stable combustion of the coal powder airflow at the burner outlet, causing flame deviation, scouring of the furnace wall, furnace heat load and steam temperature deviation. At the same time, it will cause coal powder deposition in the horizontal pipeline, leading to pipe blockage, causing the corresponding burner to burn out, and even causing a strong local reducing atmosphere, resulting in local high-temperature corrosion or coking of the heating surface, pipe burst and other problems, seriously affecting the safety and economy of the unit operation.

[0004] Therefore, we propose a fluidized pulverized coal pipeline flow rate adjustment device. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a fluidized pulverized coal pipeline flow rate adjustment device, which solves the technical problem that the pulverized coal concentration speeds of multiple pulverized pipes connected to the boiler vary greatly.

[0006] Technical solution: To achieve the above purpose, the present invention is implemented through the following technical solutions: a fluidized coal powder pipeline flow rate adjustment device, comprising: a pipe section, flanges are provided at both ends of the pipe section, a plurality of conduits are connected to the outside of the pipe section, the conduits are connected to a fixing plate, the fixing plate wraps the conduits, a guide groove is provided on the upper part of the fixing plate along the extension direction of the conduits, the guide groove is connected to the inside of the conduits, and a fixing shell is connected to the upper part of the fixing plate; an adjusting device, the adjusting device comprises a stepping motor and a plurality of resistance elements, the resistance element is slidably connected to the conduits, one end of the resistance element is fixedly connected to a fixing rod, the fixing rod is slidably connected to the conduits and the fixing plate through the guide groove, a fixing nut is provided on the upper part of the fixing rod, the stepping motor is connected to a reducer, the reducer is connected to a threaded rod, and the threaded rod is rotatably connected to the fixing nut.

[0007] Preferably, the conduit is arranged perpendicular to the longitudinal axis of the pipe segment, the conduit is connected to the inside of the pipe segment, the conduit is arranged in a mirror image along the longitudinal section of the pipe segment, and a gap is arranged between the conduits on the same side.

[0008] Preferably, a sealing plug is connected to one end of the conduit located at the pipe section, the sealing plug is slidably connected to the resistance element, and the sealing plug is fixedly connected to the inner wall of the conduit.

[0009] Preferably, the resistance element is made of wear-resistant corundum, and is in a comb-teeth shape when working. The length of the resistance element is greater than 1 / 2 of the diameter of the pipe section.

[0010] Preferably, the fixing rod is arranged perpendicularly to the catheter, and the fixing rod is in a comb-teeth shape. One end of the fixing rod is connected to an indicating rod.

[0011] Preferably, an indicator groove is provided on one side of the fixed shell, a scale line is provided on the upper part of the indicator groove of the fixed shell, and one end of the indicator rod extends out of the fixed shell through the guide groove.

[0012] Preferably, an observation hole is provided on one side of the pipe section.

[0013] Beneficial effects: This utility model provides a fluidized coal powder pipeline flow rate adjustment device. Compared with the prior art, it has the following beneficial effects:

[0014] 1. The utility model can achieve zero resistance at minimum, and can minimize the increase in resistance of the powder hose system while realizing the wind speed leveling function.

[0015] 2. Since the resistance element is in the shape of comb teeth, even if all the regulating devices are turned off, it can ensure that most of the coal powder can pass normally and will not block the primary powder pipe, thereby ensuring the safe operation of the pulverizing system. At the same time, the comb-tooth design can also re-comb the velocity field in the primary powder pipe to make the turbulent flow field uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of part of the utility model.

[0019] The reference numerals in the figure are: 1, pipe section; 2, flange; 3, conduit; 4, fixing plate; 5, guide groove; 6, fixing shell; 7, adjusting device; 8, stepping motor; 9, resistance element; 10, fixing rod; 11, fixing nut; 12, reducer; 13, threaded rod; 14, sealing plug; 15, indicator rod; 16, indicator groove; 17, scale line; 18, observation hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the practical embodiment clearer, the technical solution in the practical embodiment is clearly and completely described. Obviously, the described embodiment is a part of the practical embodiment, not all of the embodiments. Based on the embodiments in this practical, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical.

[0021] The embodiment of the present application solves the technical problem of large differences in coal powder concentration and velocity in multiple powder pipes connected to the boiler by providing a fluidized coal powder pipeline flow rate adjustment device. When in use, the resistance in each powder pipe is made close, the uniformity of the coal powder velocity and concentration in each powder pipe is improved, and the control requirements for precise combustion of the boiler are met.

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Reference Figure 1-2 A fluidized coal powder pipeline flow rate adjustment device comprises: a pipe section 1, flanges 2 are arranged at both ends of the pipe section 1, a plurality of conduits 3 are connected to the outside of the pipe section 1, the conduits 3 are connected to a fixing plate 4, the fixing plate 4 wraps the conduits 3, a guide groove 5 is arranged on the upper part of the fixing plate 4 along the extension direction of the conduits 3, the guide groove 5 is communicated with the inside of the conduits 3, a fixing shell 6 is connected to the upper part of the fixing plate 4; an adjusting device 7, the adjusting device 7 comprises a stepping motor 8 and a plurality of resistance elements 9, the resistance element 9 is slidably connected to the conduits 3, one end of the resistance element 9 is fixedly connected to a fixing rod 10, the fixing rod 10 is slidably connected to the conduits 3 and the fixing plate 4 through the guide groove 5, a fixing nut 11 is arranged on the upper part of the fixing rod 10, the stepping motor 8 is connected to a reducer 12, the reducer 12 is connected to a threaded rod 13, and the threaded rod 13 is rotatably connected to the fixing nut 11.

[0024] Flanges 2 are provided at both ends of the pipe for easy installation and maintenance. The material of the cylinder is the same as that of the user's pipeline, and the interior is treated with anti-wear. The reducer and stepper motor 8 can control the relative position of the resistance element 9 in the pipe section 1 to achieve stopping at any position. When the difference in the coal powder concentration and speed of each powder tube exceeds the set value, the resistance element 9 is automatically adjusted after intelligent analysis and calculation to reduce the penetration distance of the resistance element 9 of the powder tube with a lower coal powder speed, and increase the penetration distance of the adjustment element of the powder tube with a higher coal powder concentration and speed, so that the resistance of each powder tube is close, thereby improving the uniformity of the coal powder speed and concentration of each powder tube, and meeting the control requirements of precise combustion of the boiler.

[0025] The conduit 3 is arranged perpendicular to the longitudinal axis of the pipe section 1 , the conduit 3 is connected to the inside of the pipe section 1 , the conduit 3 is arranged in a mirror image along the longitudinal section of the pipe section 1 , and a gap is arranged between the conduits 3 on the same side.

[0026] The conduit 3 is arranged perpendicular to the longitudinal axis of the pipe segment 1, so that the resistance element 9 can be perpendicular to the pipe segment 1, thereby improving the resistance effect of the resistance element 9. The conduit 3 is arranged in a mirror image along the longitudinal section of the pipe segment 1, that is, the resistance element 9 is arranged to move relatively, so that when the resistance element 9 completely fills the pipe segment 1, the length of a single conduit 3 on the outside is minimized, thereby reducing the space occupancy rate and contributing to the effective use of space. Gaps are arranged between the conduits 3 to prevent the resistance elements 9 from being tightly connected and causing coal powder accumulation.

[0027] A sealing plug 14 is connected to one end of the conduit 3 located at the pipe section 1 . The sealing plug 14 is slidably connected to the resistance element 9 , and the sealing plug 14 is fixedly connected to the inner wall of the conduit 3 .

[0028] The sealing plug 14 improves the sealing between the regulating device 7 and the pipe section 1, ensuring that the coal powder particles will not leak.

[0029] The resistance element 9 is made of wear-resistant corundum. When working, the resistance element 9 is in a comb-tooth shape. The length of the resistance element 9 is greater than 1 / 2 of the diameter of the pipe section 1.

[0030] The resistance element 9 is made of wear-resistant corundum and has high wear resistance. The length of the resistance element 9 is greater than 1 / 2 of the diameter of the pipe section 1, so that the relative resistance elements 9 can converge at the center of the pipe section 1, thereby improving the resistance effect generated by the resistance element 9. The resistance element 9 is in a comb-tooth shape when working. Even if all the adjustment devices 7 are turned off, most of the coal powder can pass normally without blocking the primary powder pipe, thereby ensuring the safe operation of the powder making system. At the same time, the velocity field in the primary powder pipe can also be re-combed to make the turbulent flow field uniform.

[0031] The fixing rod 10 is vertically arranged with respect to the conduit 3 , and is in a comb-teeth shape. One end of the fixing rod 10 is connected to an indicating rod 15 .

[0032] The fixing rod 10 is vertically arranged with the conduit 3 to facilitate the connection between the fixing rod 10 and the resistance element 9. The fixing rod 10 is in a comb-tooth shape and can connect the fixing rod 10 with multiple resistance elements 9, thereby improving the transmission efficiency.

[0033] An indicator groove 16 is provided on one side of the fixed shell 6 , and a scale line 17 is provided on the upper part of the indicator groove 16 of the fixed shell 6 . One end of the indicator rod 15 extends out of the fixed shell 6 through the indicator groove 16 .

[0034] The indicator rod 15 and the scale line 17 facilitate the user to read the position of the resistance element 9 on site, and can compare it with the system display to check in real time whether the device is operating normally.

[0035] An observation hole 18 is provided on one side of the pipe section 1 .

[0036] The observation hole 18 is in the form of a flange, which is convenient for disassembly and installation of the observation port and is used to check the wear of the resistance element 9 inside the pipe section 1 and the inner wall of the pipe section 1.

[0037] During use, the two ends of the pipe section are connected to the powder pipes. When the difference in coal powder concentration and speed of each powder pipe exceeds the set value, the stepper motor starts to drive the resistance element to automatically adjust, reducing the penetration distance of the resistance element of the powder pipe with lower coal powder speed, and increasing the penetration distance of the adjustment element of the powder pipe with higher coal powder concentration and speed, so that the resistance of each powder pipe is close. The indicator rod and scale line are convenient for the user to read the position of the resistance element on site, which can be compared with the system display to check in real time whether the device is operating normally. The observation hole is used to check the wear of the resistance element inside the pipe section and the inner wall of the pipe section.

[0038] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The utility model can achieve zero resistance at the minimum when in use, and can minimize the increase in resistance of the powder hose system while realizing the wind speed leveling function.

[0040] 2. Since the resistance element is in the shape of comb teeth, even if all the regulating devices are turned off, it can ensure that most of the coal powder can pass normally and will not block the primary powder pipe, thereby ensuring the safe operation of the pulverizing system. At the same time, the comb-tooth design can also re-comb the velocity field in the primary powder pipe to make the turbulent flow field uniform.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fluidized coal powder pipeline flow rate adjustment device, characterized in that: include: A pipe section (1), wherein flanges (2) are provided at both ends of the pipe section (1), a plurality of conduits (3) are connected to the outside of the pipe section (1), the conduits (3) are connected to a fixing plate (4), the fixing plate (4) wraps the conduits (3), a guide groove (5) is provided on the upper part of the fixing plate (4) along the extension direction of the conduits (3), the guide groove (5) is communicated with the inside of the conduits (3), and a fixing shell (6) is connected to the upper part of the fixing plate (4); The regulating device (7) comprises a stepping motor (8) and a plurality of resistance elements (9), wherein the resistance elements (9) are slidably connected to the conduit (3), one end of the resistance element (9) is fixedly connected to a fixing rod (10), the fixing rod (10) is slidably connected to the conduit (3) and the fixing plate (4) via a guide groove (5), a fixing nut (11) is provided on the upper part of the fixing rod (10), the stepping motor (8) is connected to a reducer (12), the reducer (12) is connected to a threaded rod (13), and the threaded rod (13) is rotatably connected to the fixing nut (11).

2. A fluidized coal powder pipeline flow rate adjustment device according to claim 1, characterized in that: The conduit (3) is arranged perpendicular to the longitudinal axis of the pipe section (1), the conduit (3) is connected to the inside of the pipe section (1), the conduit (3) is arranged in a mirror image along the longitudinal section of the pipe section (1), and a gap is arranged between the conduits (3) on the same side.

3. The fluidized coal powder pipeline flow rate adjustment device according to claim 1, characterized in that: A sealing plug (14) is connected to one end of the conduit (3) located at the pipe section (1); the sealing plug (14) is slidably connected to the resistance element (9); and the sealing plug (14) is fixedly connected to the inner wall of the conduit (3).

4. The fluidized coal powder pipeline flow rate adjustment device according to claim 1, characterized in that: The resistance element (9) is made of wear-resistant corundum material, and is in the shape of comb teeth when in operation. The length of the resistance element (9) is greater than 1 / 2 of the diameter length of the pipe section (1).

5. The fluidized coal powder pipeline flow rate adjustment device according to claim 1, characterized in that: The fixing rod (10) is arranged perpendicularly to the catheter (3); the fixing rod (10) is in the shape of comb teeth; one end of the fixing rod (10) is connected to an indicating rod (15).

6. A fluidized coal powder pipeline flow rate adjustment device according to claim 5, characterized in that: An indicator groove (16) is provided on one side of the fixed shell (6), and a scale line (17) is provided on the upper portion of the indicator groove (16) of the fixed shell (6), and one end of the indicator rod (15) extends out of the fixed shell (6) through the guide groove (5).

7. The fluidized coal powder pipeline flow rate adjustment device according to claim 1, characterized in that: An observation hole (18) is provided on one side of the pipe section (1).

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