A rotatable flue gas sampling pipe

Abstract

The present invention provides a rotatable flue gas sampling pipe, which is applicable to the flue gas sampling measurement of a circular flue cross-section, and can realize the grid method measurement of the entire cross-section through a test hole, improving the data accuracy of the flue gas component measurement of the circular flue. It includes a fixed sampling pipe, a rotating sampling pipe, and a rotating sampling pipe seat; one end of the fixed sampling pipe is connected to the rotating end of the rotating sampling pipe seat through a rotary joint, and the other end of the fixed sampling pipe is exposed outside the boiler wall and is provided with a sampling pipe air extraction port; the rotating sampling pipe is fixedly installed at one end of the rotating sampling pipe seat away from the rotary joint; a group of flue gas sampling ports are arranged axially on the rotating sampling pipe; a slider is axially sleeved on the fixed sampling pipe, the outer end of a first connecting rod is pivotally connected to the slider, and the inner end of a second connecting rod is fixedly connected to the outside of the rotating sampling pipe seat, and the inner end of the second connecting rod is arranged on the extension line of the rotary joint.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas sampling, and particularly to a rotatable flue gas sampling pipe. Background Art

[0002] The measurement of flue gas components in coal-fired power plants usually adopts the grid method to arrange measuring points at the flue duct cross-section for measurement, so as to obtain the measurement average value of the entire cross-section. For a rectangular flue duct cross-section, a plurality of test holes are equidistantly arranged on one wall surface of the flue duct, and sampling pipes are used to measure the measuring points at different depths in each test hole, so as to realize the grid method measurement of the entire rectangular flue duct cross-section. For a circular flue duct cross-section, a plurality of test holes need to be equidistantly arranged along the outer circle of the circular flue duct, and sampling pipes are used to measure the measuring points at different depths in each test hole along the radial direction, so as to realize the grid method measurement of the entire circular flue duct cross-section. However, it is often impossible to build a test platform along the outer circle of the horizontally arranged circular flue duct, so it is very difficult to use the grid method to test the entire cross-section. And usually only a very small number of test holes are arranged in the circular flue duct, and the existing smoke extraction pipes cannot use the grid method to test the circular flue duct, resulting in inaccurate flue gas component measurement data. Summary of the Invention

[0003] Aiming at the above problems, the present invention provides a rotatable flue gas sampling pipe, which is suitable for the flue gas sampling measurement of a circular flue duct cross-section, and can realize the grid method measurement of the entire cross-section through one test hole, improving the data accuracy of the flue gas component measurement of the circular flue duct.

[0004] A rotatable flue gas sampling pipe, characterized in that it comprises a fixed sampling pipe, a rotating sampling pipe, and a rotating sampling pipe seat;

[0005] One end of the fixed sampling pipe is connected to the rotating end of the rotating sampling pipe seat through a rotary joint, and the other end of the fixed sampling pipe is exposed outside the outer wall of the boiler and is provided with a sampling pipe air extraction port;

[0006] The rotating sampling pipe is fixedly installed at one end of the rotating sampling pipe seat away from the rotary joint;

[0007] A group of flue gas sampling ports are arranged in the axial direction of the rotating sampling pipe;

[0008] A slider is axially sleeved on the fixed sampling pipe, the outer end of a first connecting rod is pivotally connected to the slider, the inner end of a second connecting rod is fixedly connected to the outside of the rotating sampling pipe seat, the inner end of the second connecting rod is arranged on the extension line of the rotary joint, the axial direction of the second connecting rod is parallel to the axis of the rotating sampling pipe, and the inner end of the first connecting rod is pivotally connected to the outer end of the second connecting rod.

[0009] It is further characterized in that: the rotary joint specifically includes a joint body, one axial end side of the joint body protrudes to form a first plug connector, the other axial end of the joint body is concave to form a rotary cavity, the pipe joint is positioned and inserted into the rotary cavity through a bearing, the outer protruding end of the pipe joint is fixedly inserted into the side wall mounting hole of the rotary sampling pipe seat, the side protruding part of the first plug connector is fixedly inserted into the corresponding side wall mounting hole of the fixed sampling pipe, the inner cavity of the pipe joint communicates with the inner cavity of the first plug connector, and the inner cavities of the rotary sampling pipe and the rotary sampling pipe seat communicate with the inner cavity of the fixed sampling pipe through the inner cavities of the pipe joint and the first plug connector, ensuring the smooth flow of flue gas during relative rotation;

[0010] The pipe joint and the first plug connector are coaxially arranged, and the inner axial end of the pipe joint is sealed with the rotary cavity through a sealing ring, a sealing gasket, ensuring that the flue gas will not leak out;

[0011] After the pipe joint is inserted into the rotary cavity, a fixing ring is also fixedly provided on the exposed annular surface of the joint body facing the pipe joint, and the fixing ring is sleeved on the corresponding outer periphery of the pipe joint to limit the axial position of the pipe joint, ensuring accurate and convenient assembly;

[0012] External threads are provided on the outer circumferences of the pipe joint and the first plug connector, and the pipe joint and the second plug connector are respectively threadedly connected to the corresponding side wall mounting holes of the rotary sampling pipe seat and the fixed sampling pipe;

[0013] A first sealing end cover is fixedly sleeved on the inner end of the fixed sampling pipe, and a second sealing end cover is fixedly sleeved on the outer axial end of the rotary sampling pipe, ensuring the accurate and reliable transmission direction of the flue gas;

[0014] The rotary sampling pipe is threadedly and fixedly sleeved on the outer end of the rotary sampling pipe seat, ensuring that the length of the rotary sampling pipe can be quickly adjusted according to requirements;

[0015] The flue gas sampling ports are arranged at equal intervals along the axial direction of the rotary sampling pipe, enabling multi-point sampling in the radial direction of the circular flue cross-section;

[0016] A slider scale line is also provided on the surface of the fixed sampling pipe, and the rotation trajectory of the rotary sampling pipe can be accurately obtained through the scale line and the corresponding geometric dimension relationship;

[0017] The slider is connected to the outer end of the first connecting rod through a first connecting shaft, the inner end of the first connecting rod is connected to the outer end of the second connecting rod through a second connecting shaft, a third connecting shaft protrudes from the inner end part of the second connecting rod, the third connecting shaft is fixedly inserted into the corresponding concave positioning hole of the rotary sampling pipe seat, and the second connecting rod and the rotary sampling pipe seat rotate synchronously relative to the inner end of the fixed sampling pipe.

[0018] After adopting the above technical solution, when the rotary sampling tube and the fixed sampling tube are in a straight line, the sampling tube is inserted into the detection hole in the furnace. During flue gas sampling, the flue gas sampling and suction port is connected to a suction pump, and the slider is moved to rotate the rotary sampling tube to different angles. The outer diameter of the detection hole ensures the normal driving of the first connecting rod. By extracting flue gas at different angles of the rotary sampling tube, grid method measurement of the circular flue cross-section can be achieved. It is applicable to flue gas sampling and measurement of the circular flue cross-section, and can realize grid method measurement of the entire cross-section through a single test hole, improving the data accuracy of flue gas component measurement in the circular flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a schematic connection structure diagram of the fixed sampling tube and the rotary sampling tube seat of the present invention;

[0021] Figure 3 is a schematic cross-sectional structure diagram of the rotary joint of the present invention;

[0022] The names corresponding to the serial numbers in the figure are as follows:

[0023] Sampling tube suction port 1, slider scale line 2, slider 3, first connecting shaft 4, first connecting rod 5, fixed sampling tube 6, rotary sampling tube seat 7, third connecting shaft 8, second connecting rod 9, first sealing end cover 10, second connecting shaft 11, flue gas sampling port 12, rotary sampling tube 13, second sealing end cover 14, rotary joint 15, joint body 151, first plug joint 152, rotary cavity 153, pipe joint 154, sealing ring 155, sealing gasket 156, fixing ring 157, bearing 158. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] A rotatable flue gas sampling tube, as shown in Figures 1 - 3 : It includes a fixed sampling tube 6, a rotary sampling tube 13, and a rotary sampling tube seat 7; one end of the fixed sampling tube 6 is connected to the rotary end of the rotary sampling tube seat 7 through a rotary joint 15, and the other end of the fixed sampling tube 6 is exposed outside the boiler wall and is provided with a sampling tube suction port 1; a rotary sampling tube 13 is fixedly installed at one end of the rotary sampling tube seat 7 away from the rotary joint 15; a group of flue gas sampling ports 12 are arranged axially on the rotary sampling tube 13; a slider 3 is axially sleeved on the fixed sampling tube 6, the outer end of a first connecting rod 5 is pivotally connected to the slider 3, the inner end of a second connecting rod 9 is fixedly connected to the outside of the rotary sampling tube seat 7, the inner end of the second connecting rod 9 is arranged on the extension line of the rotary joint 15, the axis of the second connecting rod 9 is parallel to the axis of the rotary sampling tube 13, and the inner end of the first connecting rod 5 is pivotally connected to the outer end of the second connecting rod 9.

[0025] During specific implementation, as shown inFigures 1 - 3 Specifically, the rotary joint 15 includes a joint body 151. One axial end side of the joint body 151 protrudes to form a first plug joint 152, and the other axial end of the joint body 151 is concave to form a rotary cavity 153. The pipe joint 154 is positioned and inserted into the rotary cavity 153 through a bearing 158. The outer protruding end of the pipe joint 154 is fixedly inserted into the side wall mounting hole of the rotary sampling pipe seat 7, and the protruding part of the first plug joint 152 is fixedly inserted into the corresponding side wall mounting hole of the fixed sampling pipe 6. The inner cavity of the pipe joint 154 communicates with the inner cavity of the first plug joint 152. The inner cavities of the rotary sampling pipe 13 and the rotary sampling pipe seat 7 communicate with the inner cavity of the fixed sampling pipe 6 through the inner cavities of the pipe joint 154 and the first plug joint 152, ensuring the smooth flow of flue gas during relative rotation;

[0026] The pipe joint 154 and the first plug joint 152 are coaxially arranged, and the inner axial end of the pipe joint 154 is sealed with the rotary cavity 153 through a sealing ring 155, a sealing gasket 156, ensuring that the flue gas will not leak out;

[0027] After the pipe joint 154 is inserted into the rotary cavity 153, a fixing ring 157 is also fixedly provided on the exposed annular surface of the joint body 151 facing the pipe joint 154. The fixing ring 157 is sleeved on the corresponding outer periphery of the pipe joint 154 to limit the axial position of the pipe joint 154, ensuring accurate and convenient assembly;

[0028] External threads are provided on the outer circumferences of the pipe joint 154 and the first plug joint 152. The pipe joint 154 and the second plug joint 152 are respectively threadedly connected to the corresponding side wall mounting holes of the rotary sampling pipe seat 7 and the fixed sampling pipe 6;

[0029] A first sealing end cover 10 is fixedly sleeved on the inner end of the fixed sampling pipe 6, and a second sealing end cover 14 is fixedly sleeved on the outer axial end of the rotary sampling pipe 13, ensuring the accurate and reliable transfer direction of the flue gas;

[0030] The rotary sampling pipe 13 is threadedly and fixedly sleeved on the outer end of the rotary sampling pipe seat 7, ensuring that the length of the rotary sampling pipe can be quickly adjusted according to requirements;

[0031] The flue gas sampling ports 12 are arranged at equal intervals along the axial direction of the rotary sampling pipe 13, enabling multi-point sampling in the radial direction of the circular flue cross-section;

[0032] A slider scale line 2 is also provided on the surface of the fixed sampling pipe 6. The rotation trajectory of the rotary sampling pipe 13 can be accurately obtained through the scale line and the corresponding geometric dimension relationship;

[0033] The slider 3 is connected to the outer end of the first connecting rod 5 through the first connecting shaft 4. The inner end of the first connecting rod 5 is connected to the outer end of the second connecting rod 9 through the second connecting shaft 11. A third connecting shaft 8 is formed by convexity on the inner end side of the second connecting rod 9. The third connecting shaft 8 is fixedly inserted into the corresponding concave positioning hole of the rotary sampling tube seat 7. The second connecting rod 9 and the rotary sampling tube seat 7 rotate synchronously relative to the inner end of the fixed sampling tube 6.

[0034] In a specific embodiment, the fixed sampling tube 6 is a steel pipe with a circular cross-section. The length and port diameter of the steel pipe can be determined according to actual needs. One end of the fixed sampling tube 6 is a through sampling and air extraction port 1, and the other end is fixedly sleeved with a first sealing end cap 10. The cross-section of the rotary sampling tube seat 7 is circular. One end is connected to the fixed sampling tube 6 near the first sealing end cap 10 and is in communication with the fixed sampling tube 6 through a rotary joint 15. The rotary sampling tube seat 7 rotates 360° around the rotary joint. The other end of the rotary sampling tube seat 7 is threadedly connected to the rotary sampling tube 13. The rotary sampling tube 13 is in communication with the rotary sampling tube seat 7, and the other end is a second sealing end cap 14. The length of the rotary sampling tube 13 can be selected according to the radius of the circular flue cross-section. A row of flue gas sampling ports 12 are arranged equidistantly on the rotary sampling tube 13, which can achieve multi-point sampling in the radial direction of the circular flue cross-section. The rotary sampling tube seat 7 realizes the rotation function through a crank and connecting rod mechanism, driving the rotary sampling tube 13 connected to it to rotate 360°. The annular slider 3 is sleeved on the fixed sampling tube 6. A first connecting shaft 4 is fixed on the slider 3. One end of the first connecting rod 5 is connected to the first connecting shaft 4 and can freely rotate around the connecting shaft. The other end of the first connecting rod 5 is connected to one end of the second connecting rod 9 through the second connecting shaft 11, and both the first connecting rod 5 and the second connecting rod 9 can freely rotate around the second connecting shaft 11. The other end of the second connecting rod 11 is connected to the third connecting shaft 8, and the second connecting rod 11 and the third connecting shaft 8 are fixedly connected and non-rotatable. The third connecting shaft 8 is fixed on the rotary sampling tube seat 7. When the slider 3 moves axially along the fixed sampling tube 6, the rotary sampling tube seat 7 is driven to rotate through the crank and connecting rod mechanism. A movable scale range of the slider 3 is engraved on the fixed sampling tube 6, and the rotation angle of the rotary sampling tube seat 7 is marked at different scales.

[0035] During flue gas sampling, the flue gas sampling and air extraction port is connected to an air extraction pump. The slider is moved to rotate the rotary sampling tube to different angles. By extracting the flue gas at different angles of the rotary sampling tube, the grid method measurement of the circular flue cross-section can be realized.

[0036] The working principle is as follows. When the rotary sampling tube and the fixed sampling tube are in a straight line, the sampling tube is inserted into the detection hole in the furnace. During flue gas sampling, the flue gas sampling air extraction port is connected to an air extraction pump, and the slider is moved to rotate the rotary sampling tube to different angles. The outer diameter of the detection hole ensures the normal operation of the drive of the first connecting rod. By extracting flue gas at different angles of the rotary sampling tube, grid method measurement of the circular flue duct cross-section can be achieved. It is applicable to flue gas sampling measurement of the circular flue duct cross-section, and grid method measurement of the entire cross-section can be realized through a single test hole, improving the data accuracy of flue gas component measurement in the circular flue duct.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotatable flue gas sampling pipe, characterized in that: It includes a fixed sampling tube, a rotating sampling tube, and a rotating sampling tube base; One end of the fixed sampling tube is connected to the rotating end of the rotating sampling tube base through a rotary joint, and the other end of the fixed sampling tube is exposed outside the outer wall of the boiler and is provided with a sampling tube air extraction port; The rotating sampling tube is fixedly installed at one end of the rotating sampling tube base away from the rotary joint; A group of flue gas sampling ports are arranged axially on the rotating sampling tube; An axially arranged slider is sleeved on the fixed sampling tube. The outer end of a first connecting rod is pivotally connected to the slider. The inner end of a second connecting rod is fixedly connected to the outside of the rotating sampling tube base. The inner end of the second connecting rod is arranged on the extension line of the rotary joint. The axis of the second connecting rod is arranged parallel to the axis of the rotating sampling tube. The inner end of the first connecting rod is pivotally connected to the outer end of the second connecting rod; The rotary joint specifically includes a joint body. One axial end side of the joint body protrudes to form a first plug connector. The other axial end of the joint body is recessed to form a rotating cavity. The pipe joint is inserted into the rotating cavity through bearing positioning. The outer protruding end of the pipe joint is fixedly inserted into the side wall mounting hole of the rotating sampling tube base. The side protruding part of the first plug connector is fixedly inserted into the corresponding side wall mounting hole of the fixed sampling tube. The inner cavity of the pipe joint communicates with the inner cavity of the first plug connector. The inner cavities of the rotating sampling tube and the rotating sampling tube base communicate with the inner cavity of the fixed sampling tube through the inner cavities of the pipe joint and the first plug connector; The pipe joint and the first plug connector are coaxially arranged, and the axial inner end of the pipe joint is sealed with the rotating cavity through a sealing ring, a sealing gasket; After the pipe joint is inserted into the rotating cavity, a fixing ring is also fixedly installed on the exposed annular surface of the joint body facing the pipe joint. The fixing ring is sleeved on the corresponding outer periphery of the pipe joint to limit the axial position of the pipe joint; 2. The rotatable flue gas sampling pipe according to claim 1, characterized in that: External threads are provided on the outer circumferences of the pipe joint and the first plug connector. The pipe joint and the second plug connector are respectively threadedly connected to the corresponding side wall mounting holes of the rotating sampling tube base and the fixed sampling tube; 3. The rotatable flue gas sampling pipe according to claim 1, characterized in that: A first sealing end cover is fixedly sleeved at the inner end of the fixed sampling tube, and a second sealing end cover is fixedly sleeved at the axial outer end of the rotating sampling tube; 4. The rotatable flue gas sampling pipe according to claim 1, characterized in that: The rotating sampling tube is threadedly sleeved on the outer end of the rotating sampling tube base; 5. The rotatable flue gas sampling pipe according to claim 4, characterized in that: The flue gas sampling ports are arranged at equal intervals along the axis of the rotating sampling tube; 6. The rotatable flue gas sampling pipe according to claim 1, wherein: Slider scale lines are also provided on the surface of the fixed sampling tube. The rotation trajectory of the rotating sampling tube can be accurately obtained through the scale lines and the corresponding geometric dimension relationships; 7. The rotatable flue gas sampling pipe according to claim 1, characterized in that: The slider is connected to the outer end of the first connecting rod through a first connecting shaft. The inner end of the first connecting rod is connected to the outer end of the second connecting rod through a second connecting shaft. A third connecting shaft protrudes from the inner end side of the second connecting rod. The third connecting shaft is fixedly inserted into the corresponding concave positioning hole of the rotating sampling tube base. The second connecting rod and the rotating sampling tube base rotate synchronously relative to the inner end of the fixed sampling tube.

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