JP6018166B2 - Gas sampling device - Google Patents

Description

  The present invention relates to a gas sampling device.

  A denitration apparatus for denitrating nitrogen oxide (NOx) from exhaust gas such as a boiler is known. Such a denitration apparatus injects ammonia gas into the exhaust gas, mixes the exhaust gas and ammonia gas, and reduces the mixture gas to nitrogen gas and water vapor by bringing the mixed gas into contact with the denitration catalyst.

  In order to perform such injection of ammonia gas without excess or deficiency, for example, a part of the exhaust gas is collected in the exhaust gas passage on the outlet side of the denitration apparatus, and the ammonia amount (concentration) contained therein is accurately measured. There is a need. Therefore, as in the techniques of Patent Document 1 and Patent Document 2, an exhaust gas sampling pipe is provided in the exhaust gas flow path, and a part of the exhaust gas is sampled outside the exhaust gas flow path through the exhaust gas sampling pipe.

JP 2012-093156 A JP 2010-236877 A

  By the way, in order to obtain the distribution of the ammonia amount in the exhaust gas passage, the ammonia amount in a plurality of locations in the exhaust gas passage may be measured. However, when measuring the ammonia amount at a plurality of locations in the exhaust gas flow path, it is necessary to install an exhaust gas sampling pipe for each location to be measured. For this reason, there is a need for an exhaust gas sampling device that can more easily collect exhaust gas at multiple locations.

  An object of the present invention is to provide a gas sampling device that makes it easier to collect exhaust gas at a plurality of locations than before.

  In order to solve the above-described problems and achieve the object, the gas sampling device of the present invention includes an introduction pipe for introducing exhaust gas into a gas analyzer arranged in the exhaust gas flow path, a valve provided in the introduction pipe, A plurality of sampling pipes having sampling portions that open to the exhaust gas flow path at different positions, and the plurality of sampling pipes introduce exhaust gas sampled by the sampling section into the valve, The flow of exhaust gas from each of a plurality of sampling pipes to the introduction pipe is controlled.

  Thereby, the gas sampling device can collect exhaust gas separately from a plurality of sampling tubes having sampling portions at different positions by switching the valves. Therefore, the gas sampling apparatus according to the present invention can more easily collect the exhaust gas at a plurality of locations than in the past.

  As a desirable aspect of the present invention, the valve includes a plurality of valve bodies that are rod-shaped members, a first flow path connected to the introduction pipe, and a plurality of second flow paths that intersect the first flow path, One end of the second flow path is connected to one sampling tube, and the other end of the second flow path is closed by the inserted valve body, and one valve body is Of the two openings facing the second flow path of one flow path, the gas analysis apparatus is disposed at a first position where the opening on the gas analyzer side is opened and the other opening is blocked, and the gas analyzer is more than the valve body. The valve body located on the side opens both the two openings of the first flow path facing the second flow path and blocks the flow of exhaust gas from the second flow path to the first flow path. It is preferable to arrange in the second position.

  The gas sampling device can introduce the exhaust gas collected by one sampling tube into the gas analyzer by adjusting the insertion depth of the valve body. That is, the gas sampling device can introduce the exhaust gas sampled from one of the plurality of sampling units into the gas analyzer by switching the valve body that is easy to control. Therefore, the gas sampling device can more easily collect the exhaust gas at a plurality of locations than in the past.

  As a desirable aspect of the present invention, it is preferable that the valve body penetrates a window portion opened in a flow path wall of the exhaust gas flow path.

  Thereby, the valve body can be detached from the valve through the window. For this reason, cleaning of a valve body is easy. Moreover, in a state where the valve body is removed from the valve, the cleaning tool can easily enter the second flow path. For this reason, the gas sampling device can facilitate cleaning of the valve. Therefore, the gas sampling device can suppress the blockage of the valve due to the deposits.

  As a desirable mode of the present invention, it is preferable that a seal member is provided between the valve body and the inner wall of the window portion.

  Thereby, the gap which may arise between a valve body and the inner wall of a window part is closed. For this reason, it becomes difficult for the exhaust gas to leak out of the exhaust gas passage. Therefore, the gas sampling device can easily clean the exhaust gas when the exhaust gas does not flow through the exhaust gas passage, and can suppress the leakage of the exhaust gas when the exhaust gas flows through the exhaust gas passage.

  As a desirable mode of the present invention, the sampling section is provided at the tip of the sampling pipe and opens toward the downstream side of the exhaust gas flow direction in the exhaust gas flow path, and the inner periphery of the sampling pipe faces the tip. It is preferable that it is large.

  Thereby, if the valve body is removed from the valve, the cleaning tool can easily reach the position of the sampling part. For this reason, the gas sampling device can facilitate the cleaning of the sampling tube. Therefore, the gas sampling device can suppress the clogging of the sampling tube due to the deposits.

  As a desirable mode of the present invention, it is preferable that inner walls of the introduction pipe, the first flow path, the second flow path, and the sampling pipe are coated with ceramic or aluminum.

  As a result, the portion where the exhaust gas is likely to come into contact with the gas analyzer from the exhaust gas flow channel is coated with ceramic or aluminum. Ceramic or aluminum coatings inhibit ammonia decomposition. For this reason, the gas sampling device can introduce the exhaust gas into the gas analyzer while suppressing decomposition of ammonia contained in the exhaust gas. Therefore, the gas sampling device can improve the measurement accuracy in the gas analyzer.

  As a desirable aspect of the present invention, it is preferable to further include a drive device connected to the valve and a control device for controlling the drive device.

  Thereby, the position of a some valve body changes automatically with a drive device and a control device. For this reason, since the gas sampling device can automatically switch the position where the exhaust gas is collected, the collection of the exhaust gas at a plurality of locations can be made easier than before.

  ADVANTAGE OF THE INVENTION According to this invention, the gas sampling device which can collect | recover the waste gas in several places more easily than before can be provided.

FIG. 1 is a schematic diagram showing a gas sampling device according to the present embodiment arranged in an exhaust gas flow path. FIG. 2 is a side view showing a gas analyzer connected to the gas sampling device according to the present embodiment. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along the line BB in FIG. FIG. 5 is a schematic diagram showing the inside of the gas analyzer when the pump is in operation. FIG. 6 is a schematic diagram showing a valve provided in the gas sampling device according to the present embodiment. FIG. 7 is a C arrow view in FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  FIG. 1 is a schematic diagram showing a gas sampling device according to the present embodiment arranged in an exhaust gas flow path. FIG. 1 shows a cross section in which the exhaust gas flow channel 91 is cut by a plane orthogonal to the flow direction G of the exhaust gas V. The gas sampling device 2 according to the present embodiment is disposed in an exhaust gas passage 91 surrounded by a passage wall 90. The exhaust gas flow channel 91 is a flow channel disposed on the outlet side of the denitration apparatus. The exhaust gas V that has passed through the denitration apparatus flows through the exhaust gas flow channel 91. For this reason, the ammonia amount (concentration) contained in the exhaust gas V needs to be accurately measured.

  In order to measure the amount (concentration) of ammonia contained in the exhaust gas V, the exhaust gas V collected by the gas sampling device 2 according to the present embodiment is introduced into the gas analyzer 1. The gas analyzer 1 is, for example, a laser type analyzer.

  As shown in FIG. 1, the cross section which cut | disconnected the exhaust gas flow path 91 with the plane orthogonal to the flow direction G of the exhaust gas V is a rectangle, for example. The gas analyzer 1 is disposed at a corner portion of the exhaust gas flow channel 91 and is fixed to the flow channel wall 90.

  FIG. 2 is a side view showing a gas analyzer connected to the gas sampling device according to the present embodiment. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along the line BB in FIG. As shown in FIG. 2, the gas analyzer 1 includes a measuring tube 10, a light emitting unit 11, a light receiving unit 12, an inner tube 13, and an inner tube 14.

  An inner tube 13 is inserted into one end of the measuring tube 10, and an inner tube 14 is inserted into the other end of the measuring tube 10. The inner tube 13 and the inner tube 14 are cylindrical members. The ends of the inner tube 13 and the inner tube 14 located in the measuring tube 10 are closed with a transparent member such as glass. The light emitting unit 11 is provided at the end of the inner tube 13 protruding from the measuring tube 10, and the light receiving unit 12 is provided at the end of the inner tube 14 protruding from the measuring tube 10.

  As shown in FIGS. 3 and 4, the measurement tube 10 is a cylindrical member. The measurement tube 10 includes a discharge unit 15, a discharge unit 16, and an introduction unit 17. The discharge unit 15 and the discharge unit 16 are cylindrical members provided on the side surface of the measurement tube 10, and can discharge the gas inside the measurement tube 10 to the outside of the measurement tube 10. As shown in FIG. 2, the discharge unit 15 is arranged at a position where the measurement tube 10 and the inner cylinder 13 overlap, and the discharge unit 16 is arranged at a position where the measurement tube 10 and the inner cylinder 14 overlap. As shown in FIG. 3, in the cross section obtained by cutting the measurement tube 10 along a plane orthogonal to the axial direction, the discharge portion 15 and the discharge portion 16 are arranged along the tangential direction of the measurement tube 10 that is a cylindrical member. Yes. The introduction portion 17 is a cylindrical member provided on the side surface of the measurement tube 10, and can introduce the exhaust gas V collected by the gas sampling device 2 into the measurement tube 10. As shown in FIG. 2, the introduction portion 17 is disposed at a position between the discharge portion 15 and the discharge portion 16. As shown in FIG. 4, the introduction portion 17 is arranged along the tangential direction of the measurement tube 10 that is a cylindrical member in a cross section obtained by cutting the measurement tube 10 along a plane orthogonal to the axial direction.

  As shown in FIG. 2, an air introduction pipe 18 and an air introduction pipe 19 are connected to the measurement pipe 10. As shown in FIG. 1, the air introduction pipe 18 is connected to a pump 81 provided outside the exhaust gas passage 91, and the air introduction pipe 19 is connected to a pump 82 provided outside the exhaust gas passage 91. ing. Thereby, the air introduction tube 18 and the air introduction tube 19 can introduce high-pressure air into the measurement tube 10. As shown in FIG. 2, the air introduction pipe 18 is disposed at the same position as the discharge part 15 in the axial direction of the measurement pipe 10, and the air introduction pipe 19 is located at the same position as the discharge part 16 in the axial direction of the measurement pipe 10. Has been placed. As shown in FIG. 3, the portion of the air introduction tube 18 that is inserted into the measurement tube 10 is parallel to the discharge portion 15 and is disposed on the same straight line as the discharge portion 15. Further, the portion of the air introduction tube 19 that is inserted into the measurement tube 10 is parallel to the discharge portion 16 and is disposed on the same straight line as the discharge portion 16.

  The light emitting unit 11 includes a light emitting unit 111 that emits a laser toward the light receiving unit 12. The light emitting unit 111 is a semiconductor laser, for example, and emits light in an infrared or near infrared wavelength region. The light receiving unit 12 includes a light receiving unit 121 that receives the laser emitted from the light emitting unit 111. The light receiving unit 121 is, for example, a photodiode. The laser emitted from the light emitting unit 111 passes through the optical path L parallel to the axial direction of the measuring tube 10 and enters the light receiving unit 121. Since the exhaust gas V is introduced into the measuring tube 10, the laser passes through the collected exhaust gas V. A molecule such as ammonia contained in the exhaust gas V has a light absorption spectrum peculiar to each molecule. The amount of light absorption (absorbance) at a specific wavelength of the laser varies depending on the ammonia concentration contained in the exhaust gas V.

  As shown in FIG. 1, the light receiving unit 12 is connected to the control device 83, and the light receiving unit 121 converts the detection value into an electric signal and transmits the electric signal to the control device 83. The control device 83 includes a memory such as a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory), and a storage unit such as a flash memory and a hard disk drive. In the control device 83, the CPU calculates the ammonia concentration contained in the exhaust gas V from the detection value of the light receiving unit 121 in cooperation with the memory, and stores the calculated value in the storage unit. More specifically, the control device 83 obtains the concentration of ammonia contained in the exhaust gas V by calculating the light absorption amount (absorbance) at a specific wavelength of the laser from the detection value of the light receiving unit 121.

  FIG. 5 is a schematic diagram showing the inside of the gas analyzer when the pump is in operation. The pump 81 and the pump 82 are connected to the control device 83 and operate according to a command from the control device 83. When the pump 81 and the pump 82 are operated, high-pressure air is injected into the measurement pipe 10 by the air introduction pipe 18 and the air introduction pipe 19. The high-pressure air injected into the measurement tube 10 is discharged to the outside of the measurement tube 10 through the discharge unit 15 and the discharge unit 16 while attracting the gas in the measurement tube 10. As a result, the inside of the measuring tube 10 becomes negative pressure, and a swirling flow along the inner wall of the measuring tube 10 is generated. Due to the negative pressure in the measurement tube 10, the exhaust gas V collected by the gas sampling device 2 is introduced into the measurement tube 10 via the introduction unit 17. The exhaust gas V introduced into the measuring tube 10 moves toward the discharge unit 15 and the discharge unit 16. For this reason, as shown in FIG. 5, a spiral swirl flow is generated in the measurement tube 10. Dust such as soot dust is pressed against the inner wall of the measuring tube 10 by a swirling flow, and the amount of dust is reduced in the region through which the optical path L passes. As a result, the gas analyzer 1 can improve the accuracy of gas analysis.

  As shown in FIG. 1, the gas sampling device 2 according to this embodiment includes an introduction pipe 20, a valve 3, a sampling pipe 22, a sampling pipe 23, a sampling pipe 24, a valve 4, and a sampling pipe 25. A sampling tube 26 and a sampling tube 27.

  As shown in FIG. 1, the introduction pipe 20 is a flow path connected to the gas analyzer 1, and a part of the exhaust gas V can be introduced into the gas analyzer 1. More specifically, as shown in FIG. 4, the introduction pipe 20 is connected to the introduction section 17 of the gas analyzer 1, whereby a part of the exhaust gas V is introduced into the measurement pipe 10 via the introduction section 17. Can be introduced. The inner wall of the introduction tube 20 is coated with, for example, ceramic or aluminum.

  As shown in FIG. 1, the valve 3 and the valve 4 are provided in the introduction pipe 20. A collection tube 22, a collection tube 23 and a collection tube 24 are connected to the valve 3. A collection tube 25, a collection tube 26 and a collection tube 27 are connected to the valve 4. The valve 3 is a device that controls the flow of the exhaust gas V from the collection tube 22, the collection tube 23, and the collection tube 24 to the introduction tube 20. The valve 4 is a device that controls the flow of the exhaust gas V from the collection pipe 25, the collection pipe 26, and the collection pipe 27 to the introduction pipe 20.

  FIG. 6 is a schematic diagram showing a valve provided in the gas sampling device according to the present embodiment. FIG. 7 is a C arrow view in FIG. As shown in FIG. 6, the valve 3 includes a housing 30, a first flow path 31, a second flow path 32, a second flow path 33, a second flow path 34, and three valve bodies 5. . The housing 30 is a solid rectangular parallelepiped member made of, for example, metal. The first flow path 31 is a linear flow path that penetrates from one end of the housing 30 to the other end. The second flow path 32, the second flow path 33, and the second flow path 34 are linear flow paths that are orthogonal to the first flow path 31. For example, the first flow path 31, the second flow path 32, the second flow path 33, and the second flow path 34 are formed by cutting the housing 30.

  Both end portions of the first flow path 31 are connected to the introduction pipe 20. A sampling tube 22 is connected to one end of the second flow path 32. A sampling tube 23 is connected to one end of the second flow path 33. A sampling tube 24 is connected to one end of the second flow path 34. The valve body 5 is inserted into the other end of each of the second flow path 32, the second flow path 33 and the second flow path 34. More specifically, the second flow path 32 includes a large diameter part 321 and a small diameter part 322, the second flow path 33 includes a large diameter part 331 and a small diameter part 332, and the second flow path 34 includes a large diameter part 341. And a small-diameter portion 342. The sampling tube 22 is connected to the small diameter portion 322, the sampling tube 23 is connected to the small diameter portion 332, and the sampling tube 24 is connected to the small diameter portion 342. The valve body 5 is inserted into each of the large diameter part 321, the large diameter part 331, and the large diameter part 341. The inner walls of the first flow path 31, the second flow path 32, the second flow path 33, and the second flow path 34 are coated with, for example, ceramic or aluminum.

  As shown in FIGS. 6 and 7, the valve body 5 is a rod-shaped member and includes a main body 51 and an operation unit 52. The main body 51 is a columnar member having an outer diameter substantially equal to the inner diameter of the large diameter portion 321, the large diameter portion 331, and the large diameter portion 341. A part of the main body 51 is inserted into the large diameter part 321, the large diameter part 331, or the large diameter part 341. For this reason, the valve body 5 closes the other ends of the second flow path 32, the second flow path 33, and the second flow path 34. The main body 51 passes through a window 92 which is a through hole opened in the flow path wall 90. The inner diameter of the window 92 is larger than the outer diameter of the main body 51. A seal member 50 is provided between the inner wall of the window portion 92 and the main body portion 51. The seal member 50 is an annular member formed of a material having heat resistance that can withstand the temperature of the exhaust gas V, for example. The seal member 50 prevents leakage of the exhaust gas V in the exhaust gas passage 91 to the outside. Further, when the exhaust gas V is not flowing through the exhaust gas passage 91, the valve body 5 can be detached from the valve 3 by being pulled toward the outside of the exhaust gas passage 91. That is, the valve body 5 is detachably attached to the valve 3.

  The main body 51 includes an inclined end surface 511 and a through hole 512. The inclined end surface 511 is an inclined surface provided at the end of the main body 51. For example, the inclined end surface 511 is formed by cutting the end of the main body 51 along a plane that forms an angle with respect to the axial direction of the main body 51. As shown in FIG. 6, the length d <b> 1 in the axial direction of the main body 51 of the inclined end surface 511 is larger than the inner diameter d <b> 2 of the first flow path 31. The through hole 512 passes through the main body 51 in a direction parallel to the first flow path 31. For example, the inner diameter of the through hole 512 is equal to the inner diameter d2 of the first flow path 31. The inner wall of the through hole 512 is coated with, for example, ceramic or aluminum.

  The operation unit 52 is a member provided at the end of the main body 51 located outside the exhaust gas flow channel 91 and is connected to the drive device 84. The drive device 84 is a linear motion mechanism including, for example, an electric motor. The drive device 84 is controlled by the control device 83 shown in FIG. The drive device 84 can cause the three valve bodies 5 to linearly move separately in response to an electrical signal from the control device 83.

  As shown in FIG. 7, the collection tube 22 includes a collection unit 22a at the tip, the collection tube 23 includes a collection unit 23a at the tip, and the collection tube 24 includes a collection unit 24a at the tip. The collection part 22a, the collection part 23a, and the collection part 24a are opened toward the downstream in the flow direction G of the exhaust gas V. Thereby, the collection tube 22, the collection tube 23, and the collection tube 24 are difficult to suck dust such as dust. As shown in FIG. 1, the collection unit 22 a, the collection unit 23 a, and the collection unit 24 a are arranged at different positions in the exhaust gas channel 91. For example, the sampling unit 22a is arranged at a position closest to the valve 3, the sampling unit 24a is arranged at a position farthest from the valve 3, and the sampling unit 23a is arranged at a position between the sampling unit 22a and the sampling unit 24a. Yes. The inner walls of the collection tube 22, the collection tube 23, and the collection tube 24 are coated with, for example, ceramic or aluminum.

  The inner circumferences of the collection tube 22, the collection tube 23, and the collection tube 24 increase toward the tip. More specifically, taking the sampling tube 22 as an example, the sampling tube 22 includes a straight portion 221 and a curved portion 222. The straight portion 221 is a member that intersects the flow direction G of the exhaust gas V, and has a constant inner diameter. The curved portion 222 is a member provided integrally with the linear portion 221 at the end of the linear portion 221, for example. The curved portion 222 bends in the downstream direction in the flow direction G of the exhaust gas V, and the inner circumference increases toward the downstream in the flow direction G of the exhaust gas V. That is, the curved portion 222 has a substantially conical shape with the sampling portion 22a as a bottom surface. The sampling tube 23 includes a straight portion 231 and a bending portion 232, and the sampling tube 24 includes a straight portion 241 and a bending portion 242. The specific shape and the like are the straight portion 221 and the bending portion 222 of the sampling tube 22. It is the same.

  The valve 3 has a collection tube (collection tube 22, collection tube 23, and collection tube) depending on the insertion depth of the valve body 5 into the second flow channel (second flow channel 32, second flow channel 33, and second flow channel 34). The flow of the exhaust gas V from 24) to the introduction pipe 20 is controlled. For example, one valve element 5 is arranged at the first position, and a valve element located closer to the gas analyzer 1 than the valve element 5 is arranged at the second position. The first position is the opening on the gas analyzer 1 side of the two openings facing the second flow path (second flow path 32, second flow path 33 or second flow path 34) of the first flow path 31. This is a position where the opening is opened and the other opening is blocked. The second position opens both the two openings facing the second flow path (second flow path 32, second flow path 33 or second flow path 34) of the first flow path 31, and the second flow path. Is a position where the flow of the exhaust gas V to the first flow path 31 is blocked. Specifically, the first position is a position where the inclined end surface 511 overlaps the first flow path 31. The second position is a position where the through hole 512 overlaps the first flow path 31. In FIG. 6, the valve body 5 inserted into the second flow path 32 and the second flow path 33 is disposed at the second position, and the valve body 5 inserted into the second flow path 34 is disposed at the first position. ing.

  As shown in FIG. 6, the flow of the exhaust gas V from the second flow path 32 to the first flow path 31 is blocked by the valve body 5 inserted into the second flow path 32 being in the second position. Further, the valve body 5 inserted into the second flow path 32 allows the exhaust gas V flowing through the first flow path 31 to pass therethrough. Further, since the valve body 5 inserted into the second flow path 33 is in the second position, the flow of the exhaust gas V from the second flow path 33 to the first flow path 31 is blocked. Further, the valve body 5 inserted into the second flow path 33 allows the exhaust gas V flowing through the first flow path 31 to pass therethrough. Further, since the valve body 5 inserted into the second flow path 34 is in the first position, the exhaust gas V of the second flow path 34 is guided to the gas analyzer 1 side of the first flow path 31. Further, the flow of the exhaust gas V from the first flow path 31 to the second flow path 34 is blocked. For this reason, in the state shown in FIG. 6, the exhaust gas V collected by the collection unit 24 a of the collection tube 24 is introduced into the introduction tube 20.

  In addition, when collecting exhaust gas from the collection pipe 22, the valve body 5 inserted in the 2nd flow path 32 is made into the 1st position. When collecting exhaust gas from the collection tube 23, the valve body 5 inserted into the second flow path 33 is set to the first position. In such a case, the valve body 5 is located on the opposite side of the valve 3 from the gas analysis apparatus 1 side with respect to the valve body 5 disposed at the first position. The insertion depth of the valve body 5 located on the side opposite to the gas analyzer 1 side with respect to the valve body 5 arranged at the first position is arbitrary.

  Thus, one valve body 5 of the valve 3 is set to the first position, and the valve body 5 located closer to the gas analyzer 1 than the valve body 5 set to the first position is set to the second position. Thus, the exhaust gas V collected by one collection tube (the collection tube 22, the collection tube 23, or the collection tube 24) is introduced into the gas analyzer 1.

  The valve 4 has the same configuration as the valve 3, but is arranged at a position different from the valve 3. As shown in FIG. 1, the valve 4 is provided closer to the distal end side of the introduction pipe 20 than the valve 3. A drive device 85 that is a linear motion mechanism is connected to the valve body 5 that is inserted into the valve 4. The drive device 85 can cause the three valve bodies 5 to move linearly separately according to the electrical signal from the control device 83.

  A collection tube 25, a collection tube 26 and a collection tube 27 are connected to the valve 4. The collection tube 25 includes a collection unit 25a at the tip, the collection tube 26 includes a collection unit 26a at the tip, and the collection tube 27 includes a collection unit 27a at the tip. As shown in FIG. 1, the collection unit 25 a, the collection unit 26 a, and the collection unit 27 a are arranged at different positions in the exhaust gas flow channel 91. Further, the inner circumferences of the collection tube 25, the collection tube 26, and the collection tube 27 increase toward the tip. The inner walls of the collection tube 25, the collection tube 26, and the collection tube 27 are coated with, for example, ceramic or aluminum.

  As shown in FIG. 6, since the valve body 5 inserted into the second flow path 34 of the valve 3 is disposed at the first position, the exhaust gas collected by the collection tube 25, the collection tube 26, and the collection tube 27. The flow of V is blocked by the valve body 5 inserted into the second flow path 34 in the valve 3. When the valve body 5 of the valve 3 disposed on the gas analyzer 1 side from the valve 4 is disposed at the first position, the insertion depth of the valve body 5 of the valve 4 may be arbitrary. On the contrary, when all the valve bodies 5 of the valve 3 are arranged at the second position, one of the valve bodies 5 of the valve 4 is arranged at the first position, which is closer to the gas analyzer 1 side than the valve body 5. The valve body is disposed at the second position. Accordingly, the gas sampling device 2 can collect the exhaust gas V from the sampling tube 25, the sampling tube 26, or the sampling tube 27.

  In the gas sampling device 2, one valve body 5 is set to the first position, and the valve body 5 located on the gas analyzer 1 side from the valve body 5 set to the first position is set to the second position. The exhaust gas V collected by one collection tube (collection tube 22, collection tube 23, collection tube 24, collection tube 25, collection tube 26 or collection tube 27) can be introduced into the gas analyzer 1. That is, the gas sampling device 2 introduces the exhaust gas V collected from one of the six sampling units 22a, the sampling unit 23a, the sampling unit 24a, the sampling unit 25a, the sampling unit 26a, and the sampling unit 27a into the gas analyzer 1. can do. Further, the position of the six valve bodies 5 is automatically changed by the control device 83, the drive device 84, and the drive device 85, whereby the gas sampling device 2 can automatically switch the position where the exhaust gas V is collected. .

  Further, when the exhaust gas V is not flowing through the exhaust gas flow channel 91, the gas sampling device 2 may be cleaned. In the gas sampling device 2, since the valve body 5 is detachably attached to the valves (the valves 3 and 4), the valve body 5 can be easily cleaned. Further, since the second flow path (second flow path 32, second flow path 33, and second flow path 34) into which the valve body 5 is inserted is linear, the valve body 5 is detached from the housing 30. Thus, the cleaning tool can easily enter the second flow path. For this reason, the gas sampling device 2 can facilitate cleaning of the valve.

  Further, in the gas sampling device 2, the inner circumference of the sampling tube (the sampling tube 22, the sampling tube 23, the sampling tube 24, the sampling tube 25, the sampling tube 26, and the sampling tube 27) increases toward the tip. Thereby, it is easy for the cleaning implement to reach the position of the collection part of the collection tube. For this reason, the gas sampling device 2 can facilitate the cleaning of the sampling tube.

  In the gas sampling device 2, the introduction pipe 20, the first flow path 31, the second flow path 32, the second flow path 33, the second flow path 34, the through hole 512, the collection pipe 22, the collection pipe 23, the collection The inner walls of the tube 24, the collection tube 25, the collection tube 26 and the collection tube 27 are coated with ceramic or aluminum. That is, the portion where the exhaust gas V may come into contact with the gas analyzer 1 from the exhaust gas flow channel 91 is coated with ceramic or aluminum. Ceramic or aluminum coatings inhibit ammonia decomposition. For this reason, the gas sampling device 2 can introduce the exhaust gas V into the gas analyzer 1 while suppressing decomposition of ammonia contained in the exhaust gas V.

  The gas sampling device 2 does not necessarily include the valve 3 and the valve 4, and may include either one of the valve 3 and the valve 4, for example. The gas sampling device 2 may include three or more valves. Further, the number of sampling tubes connected to each of the valve 3 and the valve 4 is not necessarily three as described above, but may be two or less, or may be four or more. . However, when the gas sampling device 2 has one valve, the number of sampling tubes connected to the valve is two or more.

  Note that the valves (the valve 3 and the valve 4) do not necessarily include the housing 30. That is, the valve only needs to include at least a plurality of valve bodies 5, the first flow path, and the second flow path. For example, the valve may be configured by a plurality of valve bodies 5, a first flow path that is a cylindrical member, and a second flow path that is a cylindrical member that intersects the first flow path.

  The valve body 5 does not necessarily have the inclined end surface 511. The valve body 5 only needs to have a shape capable of closing one of the openings of the first flow path 31 facing the second flow path and opening the other when disposed at the first position. For example, a protrusion protruding in a semi-cylindrical shape may be provided at the end of the valve body 5, and one of the openings of the first flow path 31 facing the second flow path may be blocked by this protrusion.

  In the present embodiment, the drive device 84 and the drive device 85 are provided separately for the valve 3 and the valve 4, but one drive device may be provided for a plurality of valves. That is, the operation of all the valve bodies 5 may be controlled by one drive device.

  As described above, the gas sampling device 2 according to the present embodiment includes the introduction pipe 20, the valves (valve 3 and valve 4), the plurality of sampling pipes (the sampling pipe 22, the sampling pipe 23, the sampling pipe 24, the sampling pipe Tube 25, collection tube 26 and collection tube 27). The introduction pipe 20 introduces the exhaust gas V into the gas analyzer 1 disposed in the exhaust gas passage 91. The valve is provided in the introduction pipe 20. The plurality of collection pipes are arranged at different positions in the exhaust gas flow channel 91 with respect to the collection units (the collection unit 22a, the collection unit 23a, the collection unit 24a, the collection unit 25a, the collection unit 26a, and the collection unit 27a) that open to the exhaust gas flow channel 91 Have. The plurality of sampling pipes introduce the exhaust gas V sampled by the sampling unit into the valve. The valve controls the flow of the exhaust gas V from each of the plurality of sampling pipes to the introduction pipe 20.

  Thereby, the gas sampling device 2 can separately collect the exhaust gas V from a plurality of sampling tubes having sampling portions at different positions by switching the valves (the valves 3 and 4). Therefore, the gas sampling device 2 can more easily collect the exhaust gas V at a plurality of locations than in the past.

  In the gas sampling device 2 according to the present embodiment, the valves (the valve 3 and the valve 4) include a plurality of valve bodies 5 that are rod-shaped members, a first flow path 31 connected to the introduction pipe 20, and a first flow path. And a second flow path (second flow path 32, second flow path 33, and second flow path 34) that intersects 31. One end of the second flow path is connected to one collection tube (collection tube 22, collection tube 23, collection tube 24, collection tube 25, collection tube 26 or collection tube 27), and the other end of the second flow path is inserted. The closed valve body 5 is closed. One valve element 5 guides the exhaust gas V in the second flow path to the gas analyzer 1 side of the first flow path 31, and blocks the flow of the exhaust gas V from the first flow path 31 to the second flow path. Placed in position. The valve body 5 located closer to the gas analyzer 1 than the valve body 5 blocks the flow of the exhaust gas V from the second flow path to the first flow path 31 and passes the exhaust gas V flowing through the first flow path 31. It is arranged at the second position.

  The gas sampling device 2 was sampled by one sampling tube (collection tube 22, collection tube 23, collection tube 24, collection tube 25, collection tube 26 or collection tube 27) by adjusting the insertion depth of the valve body 5. The exhaust gas V can be introduced into the gas analyzer 1. That is, the gas sampling device 2 is switched from one of the six sampling units 22a, the sampling unit 23a, the sampling unit 24a, the sampling unit 25a, the sampling unit 26a, and the sampling unit 27a by switching the valve body 5 that is easy to control. The collected exhaust gas V can be introduced into the gas analyzer 1. Therefore, the gas sampling device 2 can more easily collect the exhaust gas V at a plurality of locations than in the past.

  In the gas sampling device 2 according to the present embodiment, the valve body 5 passes through a window portion 92 opened in the flow path wall 90 of the exhaust gas flow path 91.

  Thereby, the valve body 5 can be detached from the valve (the valve 3 and the valve 4) through the window portion 92. For this reason, cleaning of the valve body 5 is easy. Moreover, in a state where the valve body 5 is removed from the valve, the cleaning tool can easily enter the second flow path (the second flow path 32, the second flow path 33, and the second flow path 34). For this reason, the gas sampling device 2 can facilitate cleaning of the valve. Therefore, the gas sampling device 2 can suppress the blocking of the valve due to the deposits.

  In the gas sampling device 2 according to the present embodiment, a seal member 50 is provided between the valve body 5 and the inner wall of the window portion 92.

  Thereby, the gap which may arise between the valve body 5 and the inner wall of the window part 92 is closed. For this reason, it becomes difficult for the exhaust gas V to leak out of the exhaust gas passage 91. Therefore, the gas sampling device 2 can facilitate cleaning when the exhaust gas V is not flowing through the exhaust gas passage 91, and can suppress leakage of the exhaust gas V when the exhaust gas V is flowing through the exhaust gas passage 91.

  In the gas sampling device 2 according to the present embodiment, the sampling unit (the sampling unit 22a, the sampling unit 23a, the sampling unit 24a, the sampling unit 25a, the sampling unit 26a, and the sampling unit 27a) includes a sampling tube (the sampling tube 22, the sampling tube 23). The sampling tube 24, the sampling tube 25, the sampling tube 26, and the sampling tube 27) are provided at the tip of the sampling tube 24, and open toward the downstream in the flow direction G of the exhaust gas V in the exhaust gas channel 91. In addition, the inner circumference of the sampling tube increases toward the tip.

  Thereby, if the valve body 5 is in a state of being removed from the valve, the cleaning tool is moved to the position of the collection unit (collection unit 22a, collection unit 23a, collection unit 24a, collection unit 25a, collection unit 26a, and collection unit 27a). Easy to reach. For this reason, the gas sampling device 2 can easily clean the sampling tubes (the sampling tube 22, the sampling tube 23, the sampling tube 24, the sampling tube 25, the sampling tube 26, and the sampling tube 27). Therefore, the gas sampling device 2 can suppress the clogging of the sampling tube due to the deposits.

  In the gas sampling device 2 according to the present embodiment, the introduction pipe 20, the first flow path 31, the second flow path (the second flow path 32, the second flow path 33, the second flow path 34), the collection pipe (the collection pipe) 22, the inner wall of the collection tube 23, the collection tube 24, the collection tube 25, the collection tube 26 and the collection tube 27) is coated with ceramic or aluminum.

  Thereby, the part with high possibility that the exhaust gas V contacts from the exhaust gas flow path 91 to the gas analyzer 1 is coated with ceramic or aluminum. Ceramic or aluminum coatings inhibit ammonia decomposition. For this reason, the gas sampling device 2 can introduce the exhaust gas V into the gas analyzer 1 while suppressing decomposition of ammonia contained in the exhaust gas V. Therefore, the gas sampling device 2 can improve the measurement accuracy in the gas analyzer 1.

  The gas sampling device 2 according to the present embodiment includes a drive device (drive device 84 and drive device 85) connected to the valves (valve 3 and valve 4), and a control device 83 that controls the drive device.

  Accordingly, the positions of the plurality of valve bodies 5 are automatically changed by the driving device (the driving device 84 and the driving device 85) and the control device 83. For this reason, since the gas sampling device 2 can automatically switch the position where the exhaust gas V is collected, the collection of the exhaust gas V at a plurality of locations can be made easier than before.

DESCRIPTION OF SYMBOLS 1 Gas analyzer 10 Measurement tube 11 Light emission unit 111 Light emission part 12 Light reception unit 121 Light reception part 13, 14 Inner pipe | tube 15, 16 Discharge part 17 Introduction part 18, 19 Air introduction pipe 2 Gas sampling apparatus 20 Introduction pipes 22, 23, 24 , 25, 26, 27 Sampling tubes 221, 231, 241 Straight portions 222, 232, 242 Curved portions 22a, 23a, 24a, 25a, 26a, 27a Sampling portions 3, 4 Valves 30 Housing 31 First flow paths 32, 33 , 34 Second flow path 321, 331, 341 Large diameter part 322, 332, 342 Small diameter part 5 Valve body 50 Seal member 51 Main body part 52 Operation part 511 Inclined end surface 512 Through hole 81, 82 Pump 83 Controller 84, 85 Drive Device 90 Channel wall 91 Exhaust gas channel 92 Window G Flow direction L Optical path V Exhaust gas

Claims (5)

An introduction pipe for introducing exhaust gas into the gas analyzer arranged in the exhaust gas flow path;
A valve provided in the introduction pipe;
A plurality of sampling tubes having sampling portions that open to the exhaust gas flow path at different positions;
With
The plurality of sampling pipes introduce the exhaust gas sampled by the sampling unit into the valve,
The valve controls the flow of exhaust gas from each of the plurality of sampling pipes to the introduction pipe ,
The valve includes a plurality of valve bodies that are rod-shaped members, a first flow path connected to the introduction pipe, and a plurality of second flow paths that intersect the first flow path,
One end of the second flow path is connected to one of the sampling tubes, and the other end of the second flow path is blocked by the inserted valve body,
One of the valve bodies is disposed at a first position that opens the opening on the gas analyzer side and blocks the other opening among the two openings facing the second flow path of the first flow path,
The valve body located closer to the gas analyzer than the valve body opens both of the two openings facing the second flow path of the first flow path and opens the first flow path from the second flow path. Arranged at the second position to block the flow of exhaust gas to the flow path ,
The gas sampling device , wherein the valve body passes through a window portion opened in a flow path wall of the exhaust gas flow path . The gas sampling device according to claim 1 , wherein a seal member is provided between the valve body and the inner wall of the window portion. The sampling part is provided at the tip of the sampling pipe, and opens toward the downstream of the exhaust gas flow direction in the exhaust gas channel,
The gas sampling apparatus according to claim 1 or 2 , wherein an inner circumference of the sampling tube increases toward the tip. The gas according to any one of claims 1 to 3 , wherein inner walls of the introduction pipe, the first flow path, the second flow path, and the sampling pipe are coated with ceramic or aluminum. Collection device. A drive connected to the valve;
A control device for controlling the driving device;
The gas sampling device according to any one of claims 1 to 4 , further comprising:

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