JP2015175597A - Exhaust gas sampling apparatus, and cleaning method for sampling tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas sampling apparatus that can shorten the time required until the measurement result is stabilized.SOLUTION: The exhaust gas sampling apparatus 1 comprises an outer tube 3 that is a hollow member whose one end is positioned in an exhaust passage 10 in which exhaust gas flows, and whose other end is positioned at the outside of the exhaust passage. The exhaust gas sampling apparatus comprises a sampling tube 2 which penetrates the outer tube, whose one end is positioned in the exhaust passage, whose other end is positioned at the outside of the exhaust passage, and which includes an opening 2a disposed at the one end of the exhaust passage side, and a hole disposed at the outer wall positioned inside the outer tube. The exhaust gas sampling apparatus comprises an introduction tube 21 that can introduce cleaning fluid 121 into the outer tube, and a thermometer 5 that measures temperature of the inner wall of the sampling tube positioned at the exhaust passage side closer than the hole.

Description

  The present invention relates to an exhaust gas sampling device and a cleaning method for a sampling tube.

  2. Description of the Related Art An exhaust gas sampling device for measuring the concentration of ammonia contained in exhaust gas is known. Patent Document 1 describes an analytical exhaust gas sampling method in which the inner wall of a sampling tube is washed away with a cleaning liquid, and the used cleaning liquid is included in a sample to be measured. In Patent Document 1, a part of the collection tube is covered with an outer tube, and a cleaning liquid is supplied between the collection tube and the outer tube, and the inner wall of the collection tube is formed from the pores provided on the outer peripheral surface of the collection tube. It is described that the cleaning liquid is supplied. According to the technique of Patent Document 1, it is possible to improve the measurement accuracy of the ammonia concentration contained in the exhaust gas.

JP 2004-117271 A

  When the above-described conventional technology is used, the measurement accuracy of the ammonia concentration contained in the exhaust gas is improved, but it may take time until the measurement result is stabilized. For this reason, an exhaust gas sampling device that can shorten the time until the measurement result of the ammonia concentration is stabilized is desired.

  This invention is made | formed in view of the above, Comprising: It aims at providing the cleaning method of the waste gas collection device which can shorten the time until a measurement result is stabilized, and a collection pipe | tube.

  In order to solve the above-described problems and achieve the object, an exhaust gas collecting apparatus according to the present invention is a hollow in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage. An outer pipe that is a member, an opening that penetrates the outer pipe, has one end disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, and is provided at the end on the exhaust flow path side A sampling tube comprising: a portion; a hole provided in an outer wall located inside the outer tube; an introduction tube capable of introducing a cleaning liquid into the outer tube; and the sampling tube positioned closer to the exhaust flow channel than the hole And a thermometer for measuring the temperature of the inner wall of the apparatus.

  The exhaust gas collecting apparatus according to the present invention can introduce the cleaning liquid into the collection pipe through the introduction pipe and the outer pipe before collecting the exhaust gas. Since the inside of the exhaust passage is at a high temperature of about 350 ° C., the sampling tube is also at a high temperature. For this reason, the cleaning liquid introduced into the sampling tube evaporates into a gas at first. As the cleaning solution continues to be introduced into the collection tube, the collection tube is gradually cooled. When the temperature of the inner wall of the sampling tube becomes equal to or lower than the boiling point of the cleaning liquid, the cleaning liquid passes through the sampling pipe in a liquid state. Ammonia compounds that may adhere to the inner wall of the sampling tube are dissolved in the cleaning liquid in a liquid state and removed from the inner wall of the sampling tube. Since the exhaust gas sampling device is equipped with a thermometer, it can be confirmed that the cleaning liquid passes in a liquid state on the inner wall of the sampling tube located on the exhaust channel side of the hole. Therefore, the exhaust gas sampling device can easily remove the ammonia compound adhering to the inner wall of the sampling tube located on the exhaust flow channel side from the hole. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas is mixed with the exhaust gas is reduced. Therefore, the exhaust gas sampling apparatus according to the present invention can shorten the time until the measurement result is stabilized.

  As a desirable mode of the present invention, it is preferable to further include an auxiliary pipe capable of introducing the cleaning liquid into the sampling pipe, and a first valve provided in the auxiliary pipe. As a result, the exhaust gas sampling device can introduce the cleaning liquid into the sampling pipe more quickly than when only the introduction pipe for introducing the cleaning liquid into the outer pipe is used. In addition, by closing the first valve, when the collection pipe collects the exhaust gas, the possibility that the exhaust gas is guided to the introduction pipe through the hole of the collection pipe is suppressed.

  As a desirable aspect of the present invention, it is preferable that the sampling pipe further includes a transport pipe that transports the exhaust gas collected from the opening to the outside of the sampling pipe, and a second valve provided in the transport pipe. . Thereby, the exhaust gas collection device can suppress the possibility that the cleaning liquid introduced into the collection pipe moves in the direction of the conveyance pipe by closing the second valve provided in the conveyance pipe. For this reason, the exhaust gas collection device can easily guide the cleaning liquid introduced into the collection pipe to the inner wall of the collection pipe located on the exhaust flow channel side with respect to the hole.

  As a desirable mode of the present invention, it is preferable to further include a heater provided with a heating unit disposed on the exhaust flow channel side with respect to the hole inside the sampling tube. Thereby, since the exhaust gas sampling device includes the heater, the inner wall of the sampling tube located on the exhaust flow channel side with respect to the hole can be efficiently heated. If the heating is continued with the heater, the temperature of the inner wall of the sampling tube rises. When the temperature of the inner wall of the sampling tube becomes equal to or higher than the decomposition temperature of the ammonia compound that may be attached, the ammonia compound is decomposed and removed from the inner wall of the sampling tube. Since the exhaust gas sampling device is equipped with a thermometer, it can be confirmed that the temperature of the inner wall of the sampling tube located on the exhaust flow channel side from the hole is equal to or higher than the decomposition temperature of the ammonia compound. Therefore, the exhaust gas sampling device can easily remove the ammonia compound adhering to the inner wall of the sampling tube located on the exhaust flow channel side from the hole. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas is mixed with the exhaust gas is reduced. Therefore, the exhaust gas sampling device can shorten the time until the measurement result is stabilized.

  The sampling pipe cleaning method according to the present invention includes an outer pipe that is a hollow member in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage, and passes through the outer pipe. And one end is disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, an opening provided at an end on the exhaust flow path side, and an outer wall located inside the outer pipe A sampling tube comprising: a hole provided in the sampling tube; an introduction tube capable of introducing a cleaning liquid into the outer tube; an auxiliary tube capable of introducing the cleaning liquid into the sampling tube; and the sampling located closer to the exhaust flow channel than the hole A method of cleaning the sampling tube in an exhaust gas sampling device comprising a thermometer for measuring the temperature of the inner wall of the tube, the step of introducing the cleaning liquid into the sampling tube through the introduction tube and the auxiliary tube, and the temperature If the measurement result is 100 ° C or less, A step of stopping the introduction of the serial washings, characterized in that it comprises a.

  Since the cleaning liquid is introduced into the sampling tube until the measurement result of the thermometer becomes 100 ° C. or less, there is a possibility that the cleaning liquid passes through the inner wall of the sampling tube located on the exhaust flow channel side from the hole in a liquid state. Get higher. Therefore, the sampling pipe cleaning method can easily remove the ammonia compound adhering to the inner wall of the sampling pipe located on the exhaust channel side of the hole. Therefore, the cleaning method of the sampling tube can easily remove the ammonia compound adhering to the inner wall of the sampling tube located on the exhaust flow channel side from the hole. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas is mixed with the exhaust gas is reduced. Therefore, the sampling tube cleaning method according to the present invention can shorten the time until the measurement result is stabilized.

  The sampling pipe cleaning method according to the present invention includes an outer pipe that is a hollow member in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage, and passes through the outer pipe. And one end is disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, an opening provided at an end on the exhaust flow path side, and an outer wall located inside the outer pipe A sampling pipe provided with a hole, and an introduction pipe capable of introducing a cleaning liquid into the outer pipe, a transport pipe that conveys the exhaust gas collected from the opening by the sampling pipe to the outside of the sampling pipe, A thermometer that measures the temperature of the inner wall of the sampling tube located on the exhaust flow channel side of the hole, and a heater that includes a heating unit disposed on the exhaust flow channel side of the hole inside the sampling tube; A method of cleaning the sampling tube in an exhaust gas sampling device comprising: Introducing air into the sampling tube so that the air is discharged into the exhaust channel from the opening, heating the sampling tube with the heater, and the measurement result of the thermometer is 500 ° C. or more In this case, the method includes a step of stopping heating by the heater, and a step of stopping introduction of the air into the sampling tube after heating by the heater is stopped.

  Since air is introduced into the sampling tube when the measurement result of the thermometer is equal to or higher than the decomposition temperature of the ammonia compound, the ammonia compound that may adhere to the inner wall of the sampling tube located on the exhaust flow channel side from the hole is decomposed. . Further, the air introduced into the sampling tube is discharged to the exhaust passage side together with the ammonia generated by the decomposition of the ammonia compound. Therefore, the sampling pipe cleaning method can easily remove the ammonia compound adhering to the inner wall of the sampling pipe located on the exhaust channel side of the hole. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas is mixed with the exhaust gas is reduced. Therefore, the sampling tube cleaning method according to the present invention can shorten the time until the measurement result is stabilized.

  According to the present invention, it is possible to provide an exhaust gas sampling device and a sampling tube cleaning method that can shorten the time until the measurement result is stabilized.

FIG. 1 is a schematic diagram illustrating an exhaust gas sampling apparatus according to the first embodiment. FIG. 2 is a schematic diagram illustrating an enlarged periphery of the collection tube according to the first embodiment. FIG. 3 is a flowchart illustrating a sampling tube cleaning method according to the first embodiment. FIG. 4 is a flowchart illustrating a method for measuring ammonia concentration using the exhaust gas sampling apparatus according to the first embodiment. FIG. 5 is a schematic diagram illustrating an exhaust gas sampling apparatus according to the second embodiment. FIG. 6 is an enlarged schematic view showing the periphery of the collection tube according to the second embodiment. FIG. 7 is a flowchart illustrating a sampling tube cleaning method according to the second embodiment. FIG. 8 is a flowchart illustrating a sampling method using the exhaust gas sampling apparatus according to the second embodiment.

  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.

(Embodiment 1)
FIG. 1 is a schematic diagram illustrating an exhaust gas sampling apparatus according to the first embodiment. FIG. 2 is a schematic diagram illustrating an enlarged periphery of the collection tube according to the first embodiment. The exhaust gas collecting device 1 is a device that collects the exhaust gas G from the exhaust passage 10 through which the exhaust gas G flows in order to measure the ammonia concentration contained in the exhaust gas G of, for example, a thermal power plant.

A denitration device is used to remove nitrogen oxides (NOx) contained in the exhaust gas G flowing inside the exhaust passage 10. A denitration apparatus decomposes nitrogen oxides (NOx) into nitrogen (N ₂ ) and water (H ₂ O) by injecting ammonia (NH ₃ ) into exhaust gas and bringing it into contact with a catalyst.

Part of the ammonia injected into the exhaust gas G by the denitration apparatus may pass through the catalyst without reacting with nitrogen oxides. Ammonia (unreacted ammonia) contained in the exhaust gas G that has passed through the denitration device reacts with sulfur oxide (SOx) contained in the exhaust gas G to produce ammonium hydrogen sulfate (NH ₄ HSO ₄ ). The produced acidic ammonium sulfate may block an air heater disposed downstream of the denitration apparatus. For this reason, in order to operate a thermal power plant smoothly, it is necessary to grasp the ammonia concentration contained in the exhaust gas G that has passed through the denitration device.

  The ammonia concentration of the exhaust gas G collected by the exhaust gas sampling device 1 is measured based on, for example, “ammonia analysis method in exhaust gas” defined in JISK0099. The exhaust gas collection device 1 causes the collected exhaust gas G to be absorbed by the absorption liquid 131 stored in the absorption bottle 13 shown in FIG. The absorbing liquid 131 is a boric acid solution. Then, the ammonia concentration in the exhaust gas G is measured by indophenol blue absorptiometry.

  As shown in FIG. 1, the exhaust gas sampling device 1 includes an outer tube 3, a sampling tube 2, a transport tube 23, an absorption bottle 13, a connection tube 24, a suction pump 14, a connection tube 25, and a gas meter 15. And an introduction pipe 21, a cleaning liquid pump 11, a connection pipe 22, and a cleaning liquid bottle 12. The outer tube 3 is a hollow member having one end disposed inside the exhaust passage 10 through which the exhaust gas G flows and the other end disposed outside the exhaust passage 10. The outer tube 3 has, for example, a cylindrical shape and includes a flange 4 that protrudes in the radial direction from the outer peripheral surface. As shown in FIG. 1, the flange 4 seals a gap between the exhaust passage 10 and the outer tube 3. The sampling tube 2 penetrates the outer tube 3 so that one end is disposed inside the exhaust passage 10 and the other end is disposed outside the exhaust passage 10. As shown in FIG. 2, the sampling tube 2 includes an opening 2 a that opens inside the exhaust flow path 10, and a hole 2 h that is provided in the outer wall located inside the outer tube 3.

  One end of the transfer tube 23 is connected to the sampling tube 2, and the other end is immersed in the absorption liquid 131 stored in the absorption bottle 13. The connection pipe 24 connects the absorption bottle 13 and the suction pump 14. The end of the connection pipe 24 on the absorption bin 13 side is disposed in the internal space and is not immersed in the absorption liquid 131. The absorption bin 13 is sealed except for a portion through which the transport pipe 23 and the connection pipe 24 pass. For this reason, when the suction pump 14 is operated, the inside of the absorption bin 13 and the inside of the sampling tube 2 become negative pressure, and the exhaust gas G is sucked from the opening 2 a of the sampling tube 2. The transport pipe 23 transports the exhaust gas G collected from the opening 2 a by the collection pipe 2 to the absorption bin 13. The exhaust gas G transported to the absorption bin 13 passes through the absorption liquid 131 and is transported to the gas meter 15 through the connection pipe 25. The gas meter 15 measures the flow rate of the exhaust gas G sucked by the suction pump 14.

  The introduction pipe 21 has one end connected to the outer pipe 3 and the other end connected to the cleaning liquid pump 11. The connection pipe 22 has one end connected to the cleaning liquid pump 11 and the other end immersed in the cleaning liquid 121 stored in the cleaning liquid bottle 12. The cleaning liquid 121 is pure water, for example. For this reason, when the cleaning liquid pump 11 is operated, the cleaning liquid 121 is sucked up by the connection pipe 22, and the cleaning liquid 121 is introduced into the outer pipe 3 through the introduction pipe 21. For this reason, the introduction pipe 21 can introduce the cleaning liquid 121 into the outer pipe 3.

  When measuring the ammonia concentration contained in the exhaust gas G, the suction pump 14 is first operated. Thereby, since the exhaust gas G passes through the absorbent 131, ammonia contained in the exhaust gas G is absorbed by the absorbent 131. The exhaust gas G that has absorbed ammonia is discarded after its flow rate is measured by the gas meter 15. After the exhaust gas G having a predetermined flow rate is collected, the cleaning liquid pump 11 is operated while the suction pump 14 is operating. As a result, the cleaning liquid 121 is introduced into the outer tube 3. The cleaning liquid 121 introduced into the outer tube 3 is introduced into the sampling tube 2 through the hole 2h. Since the suction pump 14 is operating, the cleaning liquid 121 introduced into the sampling tube 2 is sucked toward the absorption bottle 13. For this reason, the ammonia adhering to the inner wall of the sampling tube 2 is absorbed by the cleaning liquid 121. Thereafter, the cleaning liquid 121 that has absorbed ammonia is conveyed to the absorption bottle 13. The absorption bottle 13 stores the cleaning liquid 121 that has absorbed ammonia together with the absorbing liquid 131. Thereafter, the liquid stored in the absorption bottle 13 is conveyed to an analyzer (not shown), and the ammonia concentration is measured.

By the way, while the generator of the thermal power plant is operating, the temperature inside the exhaust passage 10 through which the exhaust gas G flows is maintained at a high temperature of about 350 ° C., but when the generator stops, the inside of the exhaust passage 10 Therefore, the sampling tube 2 is cooled. Thereafter, when the generator starts to operate again, exhaust gas G is generated, and ammonia is supplied into the exhaust passage 10. When ammonia comes into contact with the inner wall of the sampling tube 2 cooled, the ammonia reacts with sulfur oxide and the like, and ammonium hydrogen sulfate, ammonium pyrosulfate ((NH ₄ ) ₂ S ₂ O ₇ ), and ammonium aluminum sulfate (ALNH ₄ (ALNH ₄ ( Ammonia compounds such as SO ₄ ) ₂ ) may be generated on the inner wall of the collection tube 2. Since these ammonia compounds are easily dissolved in water, they are removed by washing with water. Moreover, these ammonia compounds decompose at high temperatures.

  As described above, when the concentration of ammonia contained in the exhaust gas G is measured, the cleaning liquid 121 is supplied to the sampling pipe 2 while the suction pump 14 is operating, so that the cleaning liquid 121 introduced into the sampling pipe 2 has a hole 2h. Flows in the direction toward the absorption bottle 13 from the top. Thereby, in the process of measuring the ammonia concentration contained in the exhaust gas G, the cleaning liquid 121 does not easily reach the portion of the sampling tube 2 closer to the exhaust flow path 10 than the hole 2h. For this reason, the ammonia compound adhering to the portion of the sampling tube 2 closer to the exhaust flow channel 10 than the hole 2h may remain attached even if the measurement of the ammonia concentration using the cleaning liquid 121 is repeated.

  The temperature inside the exhaust passage 10 while the generator is operating is as high as about 350 ° C. For this reason, the ammonia compound adhering to the portion of the sampling tube 2 closer to the exhaust flow path 10 than the hole 2h is gradually decomposed to generate ammonia. Thereby, while the ammonia compound is not completely decomposed, ammonia generated from the ammonia compound may be mixed with the exhaust gas G collected from the exhaust passage 10. For this reason, it may take time until the measurement result of the ammonia concentration is stabilized. Therefore, it will be described below that the exhaust gas sampling device 1 according to Embodiment 1 can shorten the time until the measurement result of the ammonia concentration is stabilized.

  As shown in FIG. 1, the exhaust gas sampling apparatus 1 according to the first embodiment includes a thermometer 5, a control unit 30, and an auxiliary pipe 26. As shown in FIG. 2, the thermometer 5 includes a probe 52 having a temperature measuring unit 51 at the tip. The temperature measuring unit 51 and the probe 52 are inserted into the sampling tube 2. The temperature measuring unit 51 measures the temperature of the inner wall of the sampling tube 2 located closer to the exhaust flow channel 10 than the hole 2h. The temperature measuring unit 51 of the thermometer 5 is inserted into the sampling tube 2 from the end opposite to the opening 2 a of the sampling tube 2, for example. A gap formed between the thermometer 5 and the inner wall of the sampling tube 2 is sealed at the end of the sampling tube 2 opposite to the opening 2a. As shown in FIG. 2, the thermometer 5 includes a spring-like temperature measuring unit 51 at the tip. Thereby, since the temperature measuring part 51 becomes easy to contact the inner wall of the sampling tube 2, the thermometer 5 can measure the temperature of the inner wall of the sampling tube 2 easily. Further, it is desirable that the temperature measuring unit 51 is disposed on the exhaust channel 10 side of the inner wall of the sampling tube 2. The thermometer 5 is connected to the control unit 30 and can transmit the measurement result to the control unit 30.

  The control unit 30 is a computer such as a personal computer (PC), and includes an input interface, an output interface, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an internal storage. And a device. The input interface, output interface, CPU, ROM, RAM, and internal storage device are connected by an internal bus. The control unit 30 can change the output signal according to the change of the input signal. The measurement result of the thermometer 5 is stored in the internal storage device at regular intervals.

  The auxiliary pipe 26 has one end connected to the introduction pipe 21 and the other end connected to the sampling pipe 2. The auxiliary pipe 26 includes the first valve 16 at an intermediate portion. The first valve 16 is connected to, for example, the control unit 30 and opens and closes according to an output signal from the control unit 30. Further, the transport pipe 23 includes a second valve 17 at an intermediate portion. The second valve 17 is connected to the control unit 30, for example, and opens and closes according to the output signal of the control unit 30. The control unit 30 is connected to the cleaning liquid pump 11 and the suction pump 14. The control unit 30 can operate or stop the cleaning liquid pump 11 and the suction pump 14.

  The exhaust gas collecting device 1 can introduce the cleaning liquid 121 into the collection tube 2 through the introduction tube 21 and the outer tube 3 before collecting the exhaust gas G. Since the inside of the exhaust passage 10 is at a high temperature of about 350 ° C., the sampling tube 2 is also at a high temperature. For this reason, the cleaning liquid 121 introduced into the sampling tube 2 evaporates into a gas. When the cleaning liquid 121 is continuously introduced into the collection tube 2, the collection tube 2 is gradually cooled. When the temperature of the inner wall of the sampling tube 2 becomes 100 ° C. or less, which is the boiling point of the cleaning liquid 121, the cleaning liquid 121 passes through the sampling tube 2 in a liquid state. Ammonia compounds that may adhere to the inner wall of the collection tube 2 are dissolved in the cleaning liquid 121 in a liquid state and removed from the inner wall of the collection tube 2. Since the exhaust gas sampling device 1 includes the thermometer 5, it can be confirmed that the cleaning liquid 121 passes in a liquid state on the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Therefore, the exhaust gas sampling device 1 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located closer to the exhaust flow channel 10 than the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the exhaust gas sampling apparatus 1 can shorten the time until the measurement result is stabilized.

(How to clean sampling tubes)
FIG. 3 is a flowchart illustrating a sampling tube cleaning method according to the first embodiment. The exhaust gas sampling device 1 can clean the sampling tube 2 before measuring the ammonia concentration. First, the generator of the thermal power plant is restarted after being stopped (step S101). Thereby, since the collection tube 2 is cooled, an ammonia compound may adhere to the inner wall of the collection tube 2.

  Next, the temperature measuring unit 51 of the thermometer 5 is inserted into the sampling tube 2 (step S102). Thereafter, the gap formed between the thermometer 5 and the inner wall of the sampling tube 2 is sealed at the end of the sampling tube 2 opposite to the opening 2a. Note that the temperature measuring unit 51 of the thermometer 5 may be inserted in the sampling tube 2 in advance from step S101 or earlier.

  Next, the thermometer 5 starts measuring the temperature of the inner wall of the sampling tube 2 (step S103). The thermometer 5 transmits a measurement result to the control unit 30 at regular time intervals, for example. The control unit 30 stores the measurement result acquired from the thermometer 5.

  Next, the control unit 30 determines whether or not the measurement result of the thermometer 5 is 250 ° C. or higher. When the measurement result of the thermometer 5 is not 250 ° C. or higher, the control unit 30 continues to acquire the temperature of the inner wall of the sampling tube 2 (No in step S104). When the measurement result of the thermometer 5 is 250 ° C. or higher, the process proceeds to step S105 (step S104, Yes). When the measurement result of the thermometer 5 is 250 ° C. or higher, there is a high possibility that the inside of the exhaust passage 10 is at a high temperature of about 350 ° C. If the inside of the exhaust channel 10 is at a high temperature, after the sampling tube 2 is cooled by cleaning, the time until the sampling tube 2 reaches a high temperature is shortened. Thereby, the possibility that the ammonia compound adheres again to the inner wall of the sampling tube 2 after cleaning the sampling tube 2 is reduced.

  Next, the control unit 30 determines whether the suction pump 14 is stopped. When the suction pump 14 is stopped, the process proceeds to Step S106 (Yes in Step S105). When the suction pump 14 is not stopped (step S105, No), the control unit 30 stops the suction pump 14 (step S107), and then proceeds to step S106.

  Next, the control unit 30 performs switching between the first valve 16 and the second valve 17 (step S106). The control unit 30 opens the first valve 16 and closes the second valve 17. Since the suction pump 14 is stopped before step S106, the second valve 17 is easily closed. When the first valve 16 is opened, the introduction pipe 26 is opened. When the second valve 17 is closed, the transfer tube 23 is sealed.

  Next, the control unit 30 operates the cleaning liquid pump 11 and the cleaning liquid 121 is introduced into the introduction pipe 21 (step S108). Accordingly, the cleaning liquid 121 is introduced into the outer tube 3 through the introduction tube 21 and is introduced into the collection tube 2 through the auxiliary tube 26. The cleaning liquid 121 introduced into the outer tube 3 is introduced into the sampling tube 2 through the hole 2h. That is, the cleaning liquid 121 is introduced into the collection tube 2 through the introduction tube 21 and the auxiliary tube 26. Since the second valve 17 is closed, the cleaning liquid 121 introduced into the sampling tube 2 moves to the exhaust flow path 10 side. Since the inside of the exhaust passage 10 is at a high temperature of about 350 ° C., the sampling tube 2 is also at a high temperature. For this reason, the cleaning liquid 121 introduced into the sampling tube 2 evaporates into a gas. When the cleaning liquid 121 is continuously introduced into the collection tube 2, the temperature of the collection tube 2 gradually decreases.

  Next, the control part 30 judges whether the measurement result of the thermometer 5 is 100 degrees C or less. When the measurement result of the thermometer 5 is not 100 ° C. or lower, the process returns to step S108 and the introduction of the cleaning liquid 121 is continued (No in step S109). When the measurement result of the thermometer 5 is 100 ° C. or less, the process proceeds to Step S110 (Yes in Step S109). When the measurement result of the thermometer 5 is 100 ° C. or lower, the cleaning liquid 121 is supplied in a liquid state to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Thereby, the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h is absorbed by the cleaning liquid 121 and removed.

  Next, the control part 30 stops the washing | cleaning liquid pump 11, and complete | finishes the cleaning of the collection pipe | tube 2 (step S110). By the cleaning method described above, the exhaust gas sampling device 1 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Therefore, the exhaust gas sampling device 1 can shorten the time until the measurement result of the ammonia concentration is stabilized.

(Measurement method of ammonia concentration)
FIG. 4 is a flowchart illustrating a method for measuring ammonia concentration using the exhaust gas sampling apparatus according to the first embodiment. Since the process from step S201 to step S210 shown in FIG. 4 is the same as the process from step S101 to step S110 shown in FIG. 3, the description from step S201 to step S210 is omitted.

  Following step S210, the control unit 30 switches between the first valve 16 and the second valve 17 (step S211). The control unit 30 closes the first valve 16 and opens the second valve 17.

  Next, the control part 30 judges whether the measurement result of the thermometer 5 is 300 degreeC or more. If the measurement result of the thermometer 5 is not 300 ° C. or higher, the thermometer 5 continues to measure the temperature of the inner wall of the sampling tube 2 (No in step S212). When the measurement result of the thermometer 5 is 300 ° C. or higher, the process proceeds to step S213 (Yes in step S212). When the measurement result of the thermometer 5 is 300 ° C. or higher, even if the exhaust gas G is collected from the exhaust passage 10, it is difficult for the ammonia compound to adhere to the inner wall of the collection pipe 2. Thereby, the possibility that the ammonia compound adheres again to the inner wall of the sampling tube 2 after cleaning the sampling tube 2 is reduced.

  Next, the control unit 30 operates the suction pump 14 (step S213). Since the second valve 17 has already been opened, the exhaust gas G is transported to the absorption bin 13 through the transport pipe 23. Thereby, the ammonia contained in the exhaust gas G is absorbed by the absorbent 131.

  Next, the control unit 30 operates the cleaning liquid pump 11, and the cleaning liquid 121 is introduced into the introduction pipe 21 (step S214). As a result, the cleaning liquid 121 is introduced into the outer tube 3. The cleaning liquid 121 introduced into the outer tube 3 is introduced into the sampling tube 2 through the hole 2h. Since the suction pump 14 is operating, the cleaning liquid 121 introduced into the sampling tube 2 is sucked toward the absorption bottle 13. For this reason, the ammonia adhering to the inner wall of the sampling tube 2 is absorbed by the cleaning liquid 121. Thereafter, the cleaning liquid 121 that has absorbed ammonia is conveyed to the absorption bottle 13. The absorption bottle 13 stores the cleaning liquid 121 that has absorbed ammonia together with the absorbing liquid 131.

  Next, the liquid stored in the absorption bottle 13 is conveyed to an analyzer (not shown), and the ammonia concentration is measured (step S215). By the measurement method described above, the exhaust gas sampling device 1 can measure the ammonia concentration in a state where the ammonia compound adhering to the inner wall of the sampling pipe 2 located on the exhaust flow channel 10 side from the hole 2h is removed. it can. Therefore, the exhaust gas sampling device 1 can shorten the time until the measurement result of the ammonia concentration is stabilized.

  As described above, the exhaust gas collecting apparatus 1 according to Embodiment 1 is an outer member that is a hollow member in which one end is disposed in the exhaust passage 10 through which the exhaust gas G flows and the other end is disposed outside the exhaust passage 10. A tube 3 is provided. The exhaust gas collecting device 1 penetrates the outer tube 3, one end is disposed in the exhaust passage 10, the other end is disposed outside the exhaust passage 10, and an opening provided at an end portion on the exhaust passage 10 side. A sampling tube 2 including a portion 2a and a hole 2h provided in an outer wall located inside the outer tube 3 is provided. The exhaust gas sampling device 1 includes a thermometer 5 that measures the temperature of the introduction pipe 21 that can introduce the cleaning liquid 121 into the outer pipe 3 and the temperature of the inner wall of the sampling pipe 2 that is located on the exhaust flow channel 10 side with respect to the hole 2h. And prepare.

  Thereby, the exhaust gas collecting device 1 can introduce the cleaning liquid 121 into the collection tube 2 through the introduction tube 21 and the outer tube 3 before collecting the exhaust gas G. Since the inside of the exhaust passage 10 is at a high temperature of about 350 ° C., the sampling tube 2 is also at a high temperature. For this reason, the cleaning liquid 121 introduced into the sampling tube 2 evaporates into a gas. When the cleaning liquid 121 is continuously introduced into the collection tube 2, the collection tube 2 is gradually cooled. When the temperature of the inner wall of the collection pipe 2 becomes equal to or lower than the boiling point of the cleaning liquid 121, the cleaning liquid 121 passes through the sampling pipe 2 in a liquid state. Ammonia compounds that may adhere to the inner wall of the collection tube 2 are dissolved in the cleaning liquid 121 in a liquid state and removed from the inner wall of the collection tube 2. Since the exhaust gas sampling device 1 includes the thermometer 5, it can be confirmed that the cleaning liquid 121 passes in a liquid state on the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Therefore, the exhaust gas sampling device 1 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located closer to the exhaust flow channel 10 than the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the exhaust gas sampling apparatus 1 can shorten the time until the measurement result is stabilized.

  In addition, the exhaust gas sampling apparatus 1 according to the first embodiment includes an auxiliary pipe 26 that can introduce the cleaning liquid 121 into the sampling pipe 2 and a first valve 16 provided in the auxiliary pipe 26. For this reason, the exhaust gas sampling apparatus 1 can introduce the cleaning liquid 121 into the sampling pipe 2 earlier than when only the introduction pipe 21 that introduces the cleaning liquid 121 into the outer pipe 3 is used. In addition, by closing the first valve 16, the possibility that the exhaust gas G is guided toward the introduction tube 21 through the hole 2 h of the sampling tube 2 when the sampling tube 2 collects the exhaust gas G is suppressed.

  Further, the exhaust gas collecting apparatus 1 according to the first embodiment includes a transport pipe 23 that transports the exhaust gas G collected from the opening 2 a by the collection pipe 2 to the outside of the collection pipe 2, and a second valve 17 provided in the transport pipe 23. And comprising. For this reason, the exhaust gas collecting device 1 closes the second valve 17 provided in the transport pipe 23 to prevent the cleaning liquid 121 introduced into the sampling pipe 2 from moving in the direction of the transport pipe 23. it can. For this reason, the exhaust gas sampling device 1 can easily guide the cleaning liquid 121 introduced into the sampling pipe 2 to the inner wall of the sampling pipe 2 located on the exhaust flow channel 10 side with respect to the hole 2h.

  Moreover, the cleaning method of the collection tube 2 according to the first embodiment includes the step of introducing the cleaning liquid 121 into the collection tube 2 through the introduction tube 21 and the auxiliary tube 26 and the cleaning solution 121 when the measurement result of the thermometer 5 is 100 ° C. or less. Stopping the introduction of. Thereby, since the cleaning liquid 121 is introduced into the sampling tube 2 until the measurement result of the thermometer 5 becomes 100 ° C. or less, the cleaning liquid 121 is disposed on the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side from the hole 2h. The possibility of passing in a liquid state increases. Therefore, the cleaning method of the sampling tube 2 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Therefore, the cleaning method for the sampling tube 2 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the method for cleaning the sampling tube 2 can shorten the time until the measurement result is stabilized.

(Embodiment 2)
FIG. 5 is a schematic diagram illustrating an exhaust gas sampling apparatus according to the second embodiment. FIG. 6 is an enlarged schematic view showing the periphery of the collection tube according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same component as what was demonstrated in Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, the exhaust gas sampling apparatus 1 </ b> A according to the second embodiment includes a heater 6 and a control unit 30 </ b> A. The heater 6 includes a heating unit 61, and the heating unit 61 is inserted into the sampling tube 2 from the end opposite to the opening 2 a of the sampling tube 2. As shown in FIG. 6, the heating unit 61 is disposed inside the sampling tube 2 on the exhaust flow channel 10 side than the hole 2 h. Thereby, the heater 6 can efficiently heat the inner wall of the sampling tube 2 located on the exhaust flow path 10 side with respect to the hole 2 h by the heating unit 61. Further, the control unit 30A is connected to the heater 6, and can operate or stop the heater 6.

  The inner wall of the sampling tube 2 heated by the heater 6 is, for example, 500 ° C. or higher. As described above, ammonia compounds that may adhere to the inner wall of the collection tube 2 are, for example, ammonium hydrogen sulfate, ammonium pyrosulfate, and aluminum ammonium sulfate. The decomposition temperature of ammonium hydrogen sulfate is about 250 ° C., the decomposition temperature of ammonium pyrosulfate is about 350 ° C., and the decomposition temperature of ammonium hydrogen sulfate is about 500 ° C. For this reason, when the inner wall of the sampling tube 2 is heated to 500 ° C. or higher, the ammonia compound that may adhere to the inner wall of the sampling tube 2 is decomposed.

  Since the exhaust gas sampling apparatus 1A includes the heater 6, it can efficiently heat the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. If the heating is continued with the heater 6, the temperature of the inner wall of the sampling tube 2 rises. When the temperature of the inner wall of the sampling tube 2 reaches 500 ° C., which is the decomposition temperature of the ammonia compound that may be attached, the ammonia compound is decomposed and removed from the inner wall of the sampling tube 2. Since the exhaust gas sampling device 1A includes the thermometer 5, it can be confirmed that the temperature of the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side from the hole 2h is 500 ° C. or higher. Therefore, the exhaust gas sampling device 1A can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the exhaust gas sampling device 1A can shorten the time until the measurement result of the ammonia concentration is stabilized.

  Moreover, the exhaust gas sampling apparatus 1A includes a third valve 19 and an air introduction pipe 27 as shown in FIG. The third valve 19 is a three-way valve, for example, and is provided in the connection pipe 22. The air introduction pipe 27 is branched from the connection pipe 22 by the third valve 19. One end of the air introduction pipe 27 is connected to the third valve 19 and the other end is opened. The third valve 19 is connected to the control unit 30A. The third valve 19 is maintained by the control unit 30A in either a cleaning liquid introduction state in which the cleaning liquid pump 11 and the cleaning liquid bottle 12 are connected or an air introduction state in which the cleaning liquid pump 11 and the air introduction pipe 27 are connected. It is. When the cleaning liquid pump 11 is operated when the third valve 19 is in the air introduction state, air is introduced into the air introduction pipe 27. The air introduction pipe 27 is desirably provided with a filter in order to remove impurities contained in the introduced air.

(How to clean sampling tubes)
FIG. 7 is a flowchart illustrating a sampling tube cleaning method according to the second embodiment. The exhaust gas sampling device 1A can clean the sampling tube 2 before measuring the ammonia concentration. First, the generator of the thermal power plant is restarted after being stopped (step S301). Thereby, since the collection tube 2 is cooled, an ammonia compound may adhere to the inner wall of the collection tube 2.

  Next, the temperature measuring unit 51 of the thermometer 5 and the heating unit 61 of the heater 6 are inserted into the sampling tube 2 (step S302). Thereafter, the gap formed between the thermometer 5 and the inner wall of the sampling tube 2 is sealed at the end of the sampling tube 2 opposite to the opening 2a. Note that the temperature measuring unit 51 of the thermometer 5 and the heating unit 61 of the heater 6 may be inserted in the sampling tube 2 in advance from step S301.

  Next, the thermometer 5 starts measuring the temperature of the inner wall of the sampling tube 2 (step S303). The thermometer 5 transmits the measurement result to the control unit 30A at regular time intervals, for example. The control unit 30A stores the measurement result acquired from the thermometer 5.

  Next, the control unit 30A determines whether the measurement result of the thermometer 5 is 250 ° C. or higher. When the measurement result of the thermometer 5 is not 250 ° C. or higher, the control unit 30A continues to acquire the temperature of the inner wall of the sampling tube 2 (No in step S304). When the measurement result of the thermometer 5 is 250 ° C. or higher, the process proceeds to step S305 (Yes in step S304). When the measurement result of the thermometer 5 is 250 ° C. or higher, there is a high possibility that the inside of the exhaust passage 10 is at a high temperature of about 350 ° C. If the inside of the exhaust channel 10 is at a high temperature, after the sampling tube 2 is cooled by cleaning, the time until the sampling tube 2 reaches a high temperature is shortened. Thereby, the possibility that the ammonia compound adheres again to the inner wall of the sampling tube 2 after cleaning the sampling tube 2 is reduced.

  Next, the control unit 30A determines whether or not the suction pump 14 is stopped. When the suction pump 14 is stopped, the process proceeds to step S306 (Yes in step S305). When the suction pump 14 is not stopped (No at Step S305), the control unit 30A stops the suction pump 14 (Step S307), and then proceeds to Step S306.

  Next, the control unit 30A switches between the first valve 16 and the second valve 17 (step S306). The controller 30A opens the first valve 16, closes the second valve 17, and puts the third valve 19 into the air introduction state. Since the suction pump 14 is stopped before step S306, the second valve 17 is easily closed. When the first valve 16 is opened, the introduction pipe 26 is opened. When the second valve 17 is closed, the transfer tube 23 is sealed.

  Next, the controller 30A operates the cleaning liquid pump 11, and air is introduced into the introduction pipe 21 through the air introduction pipe 27 (step S308). Thus, air is introduced into the outer tube 3 through the introduction tube 21 and is introduced into the collection tube 2 through the auxiliary tube 26. The air introduced into the outer tube 3 is introduced into the sampling tube 2 through the hole 2h. That is, air is introduced into the collection tube 2 through the introduction tube 21 and the auxiliary tube 26. Since the second valve 17 is closed, the air introduced into the sampling tube 2 moves to the exhaust flow path 10 side. As a result, an air flow toward the exhaust passage 10 is formed inside the sampling tube 2.

  Next, the control unit 30A activates the heater 6, and the inner wall of the sampling tube 2 is heated (step S309). Thereby, decomposition | disassembly of the ammonia compound adhering to the inner wall of the collection pipe 2 is accelerated | stimulated.

  Next, the control unit 30A determines whether the measurement result of the thermometer 5 is 500 ° C. or higher. When the measurement result of the thermometer 5 is not 500 ° C. or higher, the process returns to step S309, and heating by the heater 6 is continued (No in step S310). When the measurement result of the thermometer 5 is 500 ° C. or higher, the process proceeds to step S311 (step S310, Yes). When the measurement result of the thermometer 5 is 500 ° C. or higher, the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h is sufficiently decomposed. Further, ammonia generated by the decomposition of the ammonia compound is discharged to the exhaust passage 10 by the air flow. Thereby, the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h is removed.

  Next, the control unit 30A stops the heater 6 (step S311). Next, the control unit 30A stops the cleaning liquid pump 11 and ends the cleaning of the sampling tube 2 (step S312). By the cleaning method described above, the exhaust gas sampling device 1A can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. Therefore, the exhaust gas sampling device 1A can shorten the time until the measurement result of the ammonia concentration is stabilized.

(Measurement method of ammonia concentration)
FIG. 8 is a flowchart illustrating a sampling method using the exhaust gas sampling apparatus according to the second embodiment. The processes from step S401 to step S412 shown in FIG. 8 are the same as the processes from step S301 to step S312 shown in FIG. 7, and thus the description from step S401 to step S412 is omitted.

  After step S412, the control unit 30A switches between the first valve 16 and the second valve 17 (step S413). The control unit 30A closes the first valve 16 and opens the second valve 17.

  Next, the control unit 30A determines whether the measurement result of the thermometer 5 is 300 ° C. or higher. When the measurement result of the thermometer 5 is not 300 ° C. or higher, the thermometer 5 continues to measure the temperature of the inner wall of the sampling tube 2 (No in step S414). When the measurement result of the thermometer 5 is 300 degreeC or more, it progresses to step S415 (step S414, Yes). When the measurement result of the thermometer 5 is 300 ° C. or higher, even if the exhaust gas G is collected from the exhaust passage 10, it is difficult for the ammonia compound to adhere to the inner wall of the collection pipe 2. Thereby, the possibility that the ammonia compound adheres again to the inner wall of the sampling tube 2 after cleaning the sampling tube 2 is reduced.

  Next, the control unit 30A operates the suction pump 14 (step S415). Since the second valve 17 has already been opened, the exhaust gas G is transported to the absorption bin 13 through the transport pipe 23. Thereby, the ammonia contained in the exhaust gas G is absorbed by the absorbent 131.

  Next, the control unit 30A operates the cleaning liquid pump 11, and the cleaning liquid 121 is introduced into the introduction pipe 21 (step S416). As a result, the cleaning liquid 121 is introduced into the outer tube 3. The cleaning liquid 121 introduced into the outer tube 3 is introduced into the sampling tube 2 through the hole 2h. Since the suction pump 14 is operating, the cleaning liquid 121 introduced into the sampling tube 2 is sucked toward the absorption bottle 13. For this reason, ammonia adhering to the inner wall of the sampling tube 2 is absorbed by the cleaning liquid 121, and the cleaning liquid 121 containing ammonia is transported to the absorption bottle 13 and stored together with the absorbing liquid 131.

  Next, the liquid stored in the absorption bottle 13 is conveyed to an analyzer (not shown), and the ammonia concentration is measured (step S417). By the measurement method described above, the exhaust gas sampling device 1A can measure the ammonia concentration in a state where the ammonia compound adhering to the inner wall of the sampling pipe 2 located on the exhaust flow channel 10 side from the hole 2h is removed. it can. Therefore, the exhaust gas sampling device 1A can shorten the time until the measurement result of the ammonia concentration is stabilized.

  As described above, the exhaust gas sampling apparatus 1A according to the second embodiment includes the heater 6 including the heating unit 61 disposed inside the sampling pipe 2 and closer to the exhaust flow path 10 than the hole 2h. Since the exhaust gas sampling apparatus 1A includes the heater 6, it can efficiently heat the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. If the heating is continued with the heater 6, the temperature of the inner wall of the sampling tube 2 rises. When the temperature of the inner wall of the sampling tube 2 becomes equal to or higher than the decomposition temperature of the ammonia compound that may be attached, the ammonia compound is decomposed and removed from the inner wall of the sampling tube 2. Since the exhaust gas sampling device 1A includes the thermometer 5, it can be confirmed that the temperature of the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h is equal to or higher than the decomposition temperature of the ammonia compound. Therefore, the exhaust gas sampling device 1A can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the exhaust gas sampling device 1A can shorten the time until the measurement result of the ammonia concentration is stabilized.

  The method for cleaning the sampling tube 2 according to the second embodiment includes a step of introducing air into the sampling tube 2 so as to be discharged from the opening 2 a into the exhaust passage 10, and heating the sampling tube 2 by the heater 6. A step of stopping the heating by the heater 6 when the measurement result of the thermometer 5 is 500 ° C. or more, a step of stopping the introduction of air into the sampling tube 2 after the heating by the heater 6 is stopped, including. As a result, air is introduced into the sampling tube 2 in a state where the measurement result of the thermometer 5 is 500 ° C. or more, which is the decomposition temperature of the ammonia compound, so that the sampling tube 2 positioned closer to the exhaust channel 10 than the hole 2h Ammonia compounds that may adhere to the inner wall decompose. In addition, the air introduced into the sampling tube 2 is discharged to the exhaust passage 10 side together with the ammonia generated by the decomposition of the ammonia compound. Therefore, the cleaning method of the sampling tube 2 can easily remove the ammonia compound adhering to the inner wall of the sampling tube 2 located on the exhaust flow channel 10 side with respect to the hole 2h. For this reason, the possibility that ammonia produced by the decomposition of the ammonia compound during the collection of the exhaust gas G is mixed with the exhaust gas G is reduced. Therefore, the method for cleaning the collection tube 2 according to the second embodiment can shorten the time until the measurement result is stabilized.

1, 1A Exhaust gas collection device 10 Exhaust flow path 11 Cleaning liquid pump 12 Cleaning liquid bottle 121 Cleaning liquid 13 Absorption bottle 131 Absorption liquid 14 Suction pump 15 Gas meter 16 First valve 17 Second valve 19 Third valve 2 Collection pipe 21 Introduction pipes 22, 24 , 25 Connecting pipe 23 Transport pipe 26 Auxiliary pipe 27 Air introduction pipe 2a Opening 2h Hole 3 Outer pipe 30, 30A Control section 4 Flange 5 Thermometer 51 Temperature measuring section 52 Probe 6 Heater 61 Heating section G Exhaust gas

Claims (6)

An outer pipe which is a hollow member in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage;
An opening that penetrates the outer pipe, has one end disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, and is provided at an end on the exhaust flow path side; and A sampling tube comprising a hole provided in an outer wall located inside;
An introduction tube capable of introducing a cleaning liquid into the outer tube;
A thermometer for measuring the temperature of the inner wall of the sampling tube located on the exhaust flow channel side of the hole;
An exhaust gas collecting apparatus comprising: An auxiliary tube capable of introducing the cleaning liquid into the collection tube;
A first valve provided in the auxiliary pipe;
The exhaust gas collecting device according to claim 1, further comprising: A transport pipe for transporting the exhaust gas collected from the opening by the sampling pipe to the outside of the sampling pipe;
A second valve provided in the transport pipe;
The exhaust gas collecting device according to claim 1, further comprising: The exhaust gas collecting apparatus according to any one of claims 1 to 3, further comprising: a heater including a heating unit disposed inside the sampling tube on the exhaust flow channel side with respect to the hole. An outer pipe which is a hollow member in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage;
An opening that penetrates the outer pipe, has one end disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, and is provided at an end on the exhaust flow path side; and A sampling tube comprising a hole provided in an outer wall located inside;
An introduction tube capable of introducing a cleaning liquid into the outer tube;
An auxiliary tube capable of introducing the cleaning liquid into the collection tube;
A thermometer for measuring the temperature of the inner wall of the sampling tube located on the exhaust flow channel side of the hole;
A method of cleaning the sampling tube in an exhaust gas sampling device comprising:
Introducing the cleaning liquid into the collection tube through the introduction tube and the auxiliary tube;
When the measurement result of the thermometer is 100 ° C. or less, stopping the introduction of the cleaning liquid;
A method for cleaning a sampling tube, comprising: An outer pipe which is a hollow member in which one end is disposed in an exhaust passage through which exhaust gas flows and the other end is disposed outside the exhaust passage;
An opening that penetrates the outer pipe, has one end disposed in the exhaust flow path, the other end is disposed outside the exhaust flow path, and is provided at an end on the exhaust flow path side; and A sampling tube comprising a hole provided in an outer wall located inside;
An introduction tube capable of introducing a cleaning liquid into the outer tube;
A transport pipe for transporting the exhaust gas collected from the opening by the sampling pipe to the outside of the sampling pipe;
A thermometer for measuring the temperature of the inner wall of the sampling tube located on the exhaust flow channel side of the hole;
A heater provided with a heating portion disposed on the exhaust channel side of the hole inside the sampling tube;
A method of cleaning the sampling tube in an exhaust gas sampling device comprising:
Introducing air into the sampling tube to be exhausted from the opening into the exhaust flow path;
Heating the sampling tube with the heater;
If the measurement result of the thermometer is 500 ° C. or higher, stopping heating by the heater;
After stopping heating by the heater, stopping the introduction of the air into the sampling tube;
A method for cleaning a sampling tube, comprising:

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