JP2015225009A - Pretreatment device for gas analysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a device design in a pretreatment device for a gas analysis and deal with a wide sample gas pressure in a pretreatment device for a gas analysis.SOLUTION: In a device 5 for pretreating a gas for analysis, a drain separator 21 is provided in a sample gas flow path 25, and extracts a drain in a sample gas. A pre-cooler 23 is provided in the downstream side of the drain separator 21 in the sample gas flow path 15. A first drain pipeline 27 and a second drain pipeline 29 are the pipelines for discharging the drain discharged from the drain separate 21 and the pre-cooler 23, and vertically extending and communicated with each other. A tube pump 39 can maintain a pressure difference between an inlet and an outlet, and is a device for sending out the drain discharged from the first drain pipeline 27 and the second drain pipeline 29. A storage part 50 prevents the sample gas from flowing from the drain separator 21 to the pre-cooler 23 by passing through the first drain pipeline 27 and the second drain pipeline 29.

Description

  The present invention relates to a gas analysis pretreatment apparatus, and more particularly to a gas analysis pretreatment apparatus for removing drain before a sample gas reaches a gas analysis section.

The gas analyzer is an apparatus that measures and analyzes components of exhaust gas discharged from, for example, a high-temperature incinerator. In order to perform pretreatment such as cooling, dehumidification, and dust removal on the exhaust gas supplied to the gas analyzer, a gas analysis pretreatment device is used (see, for example, Patent Document 1).
As a conventional pretreatment apparatus, for example, there is an apparatus having a plurality of drain separators and precoolers arranged in series in one sample gas flow path. In such an apparatus, the sample gas pressure acts on the inlet side of the drain pipe of the drain separator and the precooler, and the atmospheric pressure acts on the discharge side of the drain pipe. Both drain pipes are combined into one. In order to eliminate the influence of the pressure difference between both drain pipes, a drain trap is provided in the pretreatment device.

JP 2005-195327 A

  When the drain trap is used, the water surface height of the water column fluctuates due to the sample pressure fluctuation. Therefore, when the sample pressure fluctuation is large, it is necessary to set the water seal length to the maximum. However, considering the device height limitation, the conventional drain trap may not solve this problem.

  SUMMARY OF THE INVENTION An object of the present invention is to facilitate the apparatus design and to cope with a wide sample gas pressure in a pretreatment apparatus for gas analysis.

  Hereinafter, a plurality of modes will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.

  A pretreatment apparatus for gas analysis according to an aspect of the present invention is an apparatus for sucking a sample gas and pretreating the sample gas before supplying the sample gas to a gas analyzer. A first drain extraction device, a second drain extraction device, a first drain pipe and a second drain pipe, a drain delivery device, and a gas inflow prevention structure are provided. The sample gas is not particularly limited as long as it contains moisture, and may be exhaust gas flowing through a flue, various process gases, or the like.

The first drain extraction device extracts drain in the sample gas.
The second drain extraction device extracts drain in the sample gas.

The first drain pipe and the second drain pipe are pipes for discharging drains discharged from the first drain extraction device and the second drain extraction device, respectively, extend in the vertical direction, and communicate with each other. Note that “extending in the vertical direction” is not limited as long as there is a difference in height between the tip and the end of the pipe and the drain can be moved by gravity, and it may be substantially vertical or slanted.
The drain delivery device is a device that can maintain the pressure difference between the inlet and the outlet, and sends out the drain discharged from the first drain pipe and the second drain pipe. Any drain extraction device may be used as long as it has the above functions.For example, a pump capable of maintaining the pressure difference between the inlet and the outlet, a device capable of maintaining the pressure difference between the inlet and the outlet by sending out the drain using gravity. There may be.
The gas inflow prevention structure prevents the sample gas from flowing from the first drain extraction device to the second drain extraction device through the first drain piping and the second drain piping. The gas inflow prevention structure may be anything as long as it becomes a resistance when the sample gas passes and suppresses gas movement.

In this apparatus, the drain flows from the first drain extractor through the first drain pipe, and the drain from the second drain extractor flows through the second pipe. The drain is discharged from the first drain pipe and the second drain pipe by the drain delivery device. Here, since the drain delivery device can maintain the pressure difference between the inlet and the outlet, the pressure difference between the first drain pipe side and the second drain pipe side and the discharge side is maintained. Furthermore, since the drain delivery device discharges the drain from both the first drain extraction device and the second drain extraction device together, it becomes smaller than the number of drain pipes.
Further, in this apparatus, the sample gas is prevented from flowing from the first drain extraction device to the second drain extraction device through the first drain piping and the second drain piping by the gas inflow prevention structure.

The gas inflow prevention structure may be a water-sealed structure that is provided between the first drain pipe and the second drain pipe and stores the drain discharged from the first drain extraction device and / or the second drain extraction device. Good.
In this device, the water seal structure prevents the sample gas from flowing from the first drain extraction device to the second drain extraction device through the first drain piping and the second drain piping.

The water seal structure may have a storage unit that stores the drain discharged from the first drain extraction device and / or the second drain extraction device and flows only the drain exceeding a predetermined amount to the drain delivery device side. Good.
In this apparatus, drain is always stored in the storage part during the operation of the apparatus.

The pretreatment device for gas analysis extends to the third drain piping connecting the first drain piping and the second drain piping, and the drain delivery device, and includes the first drain piping, the second drain piping, and the third drain piping. And a fourth drain pipe connected to at least one.
In this apparatus, since the pipes are closed, there is no pressure leakage.

  The fourth drain pipe may be connected to the intermediate part of the first drain pipe or the intermediate part of the second drain pipe. In this case, the highest water level of the reservoir is determined by the connection position of the fourth drain pipe.

The apparatus may further include a control unit that controls the driving of the drain sending device so that the drain can be stored from the drain sending device to the first drain pipe and the second drain pipe.
In this apparatus, the water level of the first drain pipe and the second drain pipe is controlled by the control unit driving the drain delivery device. As a result, drain overflow and depletion are less likely to occur.

A gas analyzer according to another aspect of the present invention includes the gas analysis pretreatment device and a gas analyzer.
In this apparatus, the effect of the gas analysis pretreatment apparatus can be obtained.

  In the pretreatment apparatus for gas analysis according to the present invention, the apparatus design is facilitated and a wide range of sample gas pressures can be handled.

The schematic block diagram of a gas analyzer. The flowchart which shows the drain process control of the pretreatment apparatus for gas analysis. The schematic block diagram of a gas analyzer (2nd Embodiment). The schematic block diagram of a gas analyzer (3rd Embodiment). The schematic block diagram of a gas analyzer (5th Embodiment). Schematic block diagram of a gas analyzer (sixth embodiment). The schematic block diagram of a gas analyzer (7th Embodiment).

1. First Embodiment (1) Gas Analyzer A schematic configuration of a gas analyzer 1 will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a gas analyzer.

The gas analyzer 1 is an apparatus that analyzes a sample gas sampled from a flue and measures the amount of SOx and NOx in the gas, for example.
The gas analyzer 1 mainly includes a probe tube 3, a gas analysis pretreatment device 5 (hereinafter, “pretreatment device 5”), a main cooler 9, and a gas analysis unit 11.

The probe tube 3 is, for example, a sampling member disposed in a flue.
The pretreatment device 5 is a device for performing pretreatment such as dehumidification and dust removal on the exhaust gas supplied to the gas analysis unit 11. In this embodiment, the dehumidifying function will be mainly described.

The pretreatment device 5 has a sample gas flow path 15 for sucking the exhaust gas flowing through the flue as a sample gas and further transporting it to the gas analyzer 11 side.
The pretreatment device 5 further has a drain separator 21, a precooler 23, a needle valve 26, and a vacuum pump 25 in this order on the sample gas flow path 15 from upstream to downstream. If the vacuum pump 25 sucks and collects the exhaust gas flowing in the flue as a sample gas, the sucked sample gas is transferred to the gas analyzer 11 through the sample gas flow path 15.
The drain separator 21 is a device that generates condensed water by condensation of moisture contained in the sample gas. The precooler 23 is an electronic cooler as a cooling dehumidifier that adjusts the sample gas to a target humidity. Thus, the drain separator 21 and the precooler 23 are devices that extract drain in the sample gas. The pretreatment device 5 has a filter (not shown) and other known configurations.

The main cooler 9 is disposed in the sample gas flow path 15 extending from the pretreatment device 5. The main cooler 9 is an electronic cooler as a cooling dehumidifier that adjusts the sample gas to a humidity suitable for analysis.
A first discharge drain pipe 12 extending downward is connected to the main cooler 9. In addition, there is a sample gas release part on the upstream side of the main cooler 9, so that atmospheric pressure acts on the drain discharged from the main cooler 9.

  The gas analyzer 11 is, for example, an ultraviolet emission gas analyzer, a chemiluminescence gas analyzer, or an infrared gas analyzer. In particular, when the infrared gas analyzer measures the concentration of a predetermined component of the sample gas, it is important to remove the influence of moisture interference. In particular, in an analyzer using a non-dispersive infrared absorption method, interference occurs due to water absorption in the entire infrared wavelength region, which is a problem. Therefore, in the pretreatment device 5 of the present embodiment, the drain separator 21 and the precooler 23 are used to reduce the amount of water contained in the sample gas to a constant value.

(2) Drain discharge structure of pretreatment device Next, the drain discharge structure of the pretreatment device 5 will be described. As described above, the pretreatment device 5 includes the drain separator 21 and the precooler 23, and the drain is discharged from both devices.

The drain separator 21 is provided with a first drain pipe 27 extending downward. The precooler 23 is provided with a second drain pipe 29 extending downward. The first drain pipe 27 and the second drain pipe 29 are pipes for discharging the drain discharged from the drain separator 21 and the precooler 23, respectively. The lower ends of the first drain pipe 27 and the second drain pipe 29 are connected by a third drain pipe 31. In this embodiment, the 3rd drain piping 31 is a member which connects the 1st drain piping 27 and the 2nd drain piping 29, for example, is a piping extended in a horizontal direction in this embodiment. However, the shape of the third drain pipe is not limited to the above, and the third drain pipe may have an obliquely extending shape, or a connection location where the first drain pipe and the second drain pipe are directly connected. It may be configured piping. As described above, the first drain pipe 27 and the second drain pipe 29 are connected to each other in a closed state.
Note that a first safety pot 33 and a second safety pot 35 are provided above the first drain pipe 27 and the second drain pipe 29, respectively. The first safety pot 33 and the second safety pot 35 are members for preventing the drain that flows backward from below from further moving to the sample gas flow path 15 side. In this embodiment, a water level sensor 49 is provided below the second safety pot 35. The water level sensor 49 is a general sensor, and the type and position are not particularly limited.

The upper end of the fourth drain pipe 37 is disposed at an intermediate portion of the second drain pipe 29 (but below the second safety pot 35) and extends obliquely downward. The lower end of the fourth drain pipe 37 extends to the tube pump 39. With such a structure, the lower part of the first drain pipe 27, the lower part of the second drain pipe 29, and the third drain pipe 31 function as the storage unit 50 that can store the drain. In addition, if only the function of a storage part is realizable, the shape and structure of each drain piping will not be specifically limited. The fourth drain pipe 37 may be connected to any drain pipe as long as it can transfer the drain from the storage unit 50 to the tube pump 39. Further, in this embodiment, the fourth drain pipe 37 is connected to the intermediate part of the second drain pipe 27, but may be connected to the intermediate part of the first drain pipe 27.
When the water level exceeds the upper end of the fourth drain pipe 37, the drain stored in the storage unit 50 flows through the fourth drain pipe 37 and moves to the tube pump 39.
As described above, in the present embodiment, the reservoir 50 prevents the sample gas from flowing from the drain separator 21 through the first drain pipe 27 and the second drain pipe 29 to the precooler 23. Is realized.

The tube pump 39 can maintain a pressure difference between the inlet side and the outlet side, and can transfer gas and liquid. Since the structure and function of the tube pump 39 are known, the description thereof is omitted here. The tube pump 39 communicates with the first drain pipe 27 and the second drain pipe 29 (details will be described later). In this specification, “communication” means that the pipes are connected by a pipe or the like, and includes a case where, for example, water or a valve exists in the pipe and gas cannot move.
The tube pump 39 restricts the movement of gas between the drain pipe on the sample gas pressure side and the discharge drain pipe on the atmospheric pressure side, and is blocked in pressure.

(3) Control Configuration of Preprocessing Device Next, a control configuration of the preprocessing device 5 will be described.
The preprocessing device 5 has a control unit 43. The control unit 43 is a computer having a CPU, RAM, and ROM. The control unit 43 controls a plurality of devices of the preprocessing device 5 by executing various programs. The control unit 43 may be a device that controls the entire gas analyzer 1.

  The control unit 43 can control the vacuum pump 25 and the tube pump 39. Further, the control unit 43 can receive a detection signal from the water level sensor 49. The control unit 43 can also control the precooler 23.

  An input unit 45 and a display unit 47 are connected to the control unit 43.

(4) Drain Processing Control of Pre-processing Device Next, drain discharge control of the pre-processing device 5 will be described with reference to FIG. FIG. 2 is a flowchart showing drain processing control of the pretreatment device for gas analysis.
First, moisture is stored in the storage unit 50 including the first drain pipe 27, the second drain pipe 29, and the third drain pipe 31 (step S1). Thereby, a water seal structure is formed between the first drain pipe 27 and the second drain pipe 29.

  Thereafter, the controller 43 drives the precooler 23 while driving the vacuum pump 25 to transfer the sample gas. At that time, the control unit 43 causes the tube pump 39 to operate intermittently (step S2). Specifically, for example, the tube pump 39 is driven once every 5 minutes for 10 seconds. As a result, the drain that overflows from the reservoir 50 and flows toward the tube pump 39 is discharged to the second discharge drain pipe 41 by the tube pump 39. When there is no drain overflowing from the storage unit 50, the tube pump 39 transfers the sample gas from the drain discharge port of the precooler 23 through the second drain pipe 29. In this case, compared with the transport amount of the vacuum pump 25, the transport amount of the tube pump 39 is negligibly small, and since the overflow is taken downstream of the vacuum pump 25, the tube pump 39 transports the sample gas. This will not cause any problems.

  Subsequently, the control unit 43 determines whether or not the water level sensor 49 is turned on (step S3). If the water level sensor 49 is on, the process proceeds to step S4. If the water level sensor 49 is not on, the process returns to step S2 and the intermittent operation is continued. Here, the fact that the water level sensor 49 is turned on means that the drain overflowing from the storage unit 50 for some reason has raised the water level to the second safety pot 35 without flowing to the fourth drain pipe 37 side. .

  The control unit 43 switches the tube pump 39 to the continuous operation and discharges the drain overflowing from the storage unit 50 (step S4). In the above embodiment, the discharge flow rate is increased by switching from intermittent operation to continuous operation. However, control for realizing a plurality of levels of discharge flow rate is not limited to the above embodiment. For example, the operation speed of the tube pump 39 may be increased during the continuous operation from the beginning, or the frequency of the intermittent operation may be increased during the intermittent operation from the beginning.

Subsequently, the control unit 43 determines whether or not a predetermined time has elapsed (step S5). If the predetermined time has elapsed, the process proceeds to step S7, and if the predetermined time has not elapsed, the process proceeds to step S6.
The fact that the predetermined time has passed with the water level sensor 49 turned on after starting the continuous operation means that the tube pump 39 has failed or malfunctioned and drainage has not been sufficiently performed. Therefore, the control unit 43 displays alert information on the display unit 47. For example, the alert information display informs that all devices are to be stopped after elapse of time corresponding to the capacities of the first safety pot 33 and the second safety pot 35. The notification of alert information is not limited to display on the display, and may be other means such as voice, lighting of a warning light, mail notification to other computers, and combinations thereof.

If the predetermined time has not elapsed, the control unit 43 determines whether or not the water level sensor 49 has been turned off (step S6).
If turned off, the process returns to step S2 and is switched to intermittent operation.
If not turned off, the process returns to step S4 and the continuous operation is continued.

2. 2nd Embodiment In 1st Embodiment, although the block | closed storage part was comprised by 1st drain piping and 2nd drain piping, the structure of the block | closed storage part is not limited to 1st Embodiment. As such another embodiment, the following second embodiment will be described.
The pre-processing device 5A in the second embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as 1st Embodiment.

  A drain pipe 31a is connected to the lower end of the first drain pipe 27, and a lower end of a fifth drain pipe 32 extending in the vertical direction is connected to the other end. The second drain pipe 29 </ b> A includes a first portion 29 a above the second safety pot 35, a second portion 29 b below the second safety pot 35, and a water level confirmation unit 46 below. The water level confirmation part 46 is comprised from the transparent tube, and can confirm the quantity which the drain | drain accumulated by visual observation from the outside. The lower part of the water level confirmation unit 46 is connected to the tube pump 39 by a fourth drain pipe 37a.

A connecting pipe 34 is connected to the upper end of the fifth drain pipe 32. The connecting pipe 34 extends in the horizontal direction and is connected to the second portion 29b of the second drain pipe 29A. The connection pipe 34 is a member for guiding the drain to the second drain pipe 29A when the water level of the drain of the storage section 50A becomes high. The drain pipe 31a, the fifth drain pipe 32, and the connecting pipe 34 described above function as a third drain pipe that connects the first drain pipe 27 and the second drain pipe 29A.
With such a structure, the lower part of the first drain pipe 27, the fifth drain pipe 32, and the connecting pipe 34 function as a storage section 50A that can store the drain. The storage unit 50A stores only the drain from the first drain pipe 27.
The above-described water level confirmation unit 46 is a part of the second drain pipe 29A, and is disposed below the location where the connection pipe 34 is connected. The drain that has been extracted from the precooler 23 and flows through the second drain pipe 29A and the drain that has been extracted from the drain separator 21 and stored in the storage 50A flows into the water level confirmation unit 46. When the water level reaches the connecting pipe 34, the drain accumulated in the storage unit 50A flows through the connecting pipe 34 to the second drain pipe 29A side. Then, the drain moves to the tube pump 39 through the second portion 29b of the second drain pipe 29A and the water level confirmation unit 46, and further through the fourth drain pipe 37a.

In this embodiment, when the water level in the reservoir 50A rises, the drain flows through the connecting pipe 34 and forcibly flows into the second drain pipe 29A. Therefore, the excess drain from the reservoir 50A can surely flow below the second drain pipe 29A.
In this embodiment, the drain accumulated in the second drain pipe 29A increases the water level in the second drain pipe 29A from the position of the tube pump 39 as the amount increases. In this case, the operator can confirm the amount of drain accumulated in the second drain pipe 29 </ b> A by the water level confirmation unit 46.

  In this embodiment, a water seal structure by the storage section 50 </ b> A and an excess drain storage structure by the tube pump 39 are provided, and the amount of the latter excess drain can be confirmed by the operator by the water level confirmation section 46.

  In addition, in 1st Embodiment and 2nd Embodiment, although the storage part in which the drain was always collected was implement | achieved by drain piping, the storage part of this invention may be implement | achieved by another structure. For example, you may arrange | position the drain tank in which the drain of fixed height accumulates in the lower end of 1st drain piping and 2nd drain piping. In this case, the drain exceeding the predetermined height flows from the drain tank to the tube pump side.

3. Third Embodiment In the first embodiment and the second embodiment, the drain discharged from the first drain extraction device and / or the second drain extraction device is stored, and only the drain exceeding a predetermined amount flows to the pump side. The water seal structure was realized by the storage part. However, the water seal structure may be realized by other configurations. For example, the water seal structure may be a reservoir that can store drain from the pump to the first drain pipe and the second drain pipe. In this case, the amount of drain in the water seal structure is determined by the operation of the pump. A third embodiment will be described as such an embodiment.

  The pre-processing device 5B in the third embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as 1st Embodiment.

  The drain separator 21 is provided with a first drain pipe 27 extending downward. The precooler 23 is provided with a second drain pipe 29 extending downward. The lower ends of the first drain pipe 27 and the second drain pipe 29 are connected by a third drain pipe 31. Thus, the 1st drain piping 27 and the 2nd drain piping 29 are mutually connected in the blockade state.

The fourth drain pipe 51 is connected to the lower ends of the third drain pipe 31, that is, the first drain pipe 27 and the second drain pipe, and extends in the horizontal direction to the tube pump 39.
With such a structure, the lower part of the first drain pipe 27, the lower part of the second drain pipe 29, the third drain pipe 31, and the fourth drain pipe 51 function as a reservoir 50 </ b> B that can store drain.

  The second drain pipe 29 is provided with two water level sensors below the second safety pot 35. A high level sensor 53 and a low level sensor 55. The high level sensor 53 is disposed close to the lower side of the second safety pot 35. The low level sensor 55 is disposed below the high level sensor 53. The high level sensor 53 and the low level sensor 55 may be provided in the first drain pipe 27.

  In this embodiment, the control unit 43 drives the tube pump 39 so that the drain can be stored from the tube pump 39 to the first drain pipe 27 and the second drain pipe 29 (in this embodiment, the storage section 50B). To control.

  Next, drain discharge control of the pretreatment device 5 will be described.

  The controller 43 drives the precooler 23 while driving the vacuum pump 25 to transfer the sample gas. At that time, the control unit 43 stops driving the tube pump 39.

Subsequently, the control unit 43 determines whether or not the high level sensor 53 is turned on. If the high level sensor 53 is on, the tube pump 39 is driven by the control unit 43. Thereby, the drain stored in the storage unit 50 </ b> B is discharged to the second discharge drain pipe 41 by the tube pump 39. Here, the fact that the high level sensor 53 is turned on means that the drain accumulated in the reservoir 50B is not sufficiently discharged for some reason, and the water level has risen to the upper part of the first drain pipe 27 and the second drain pipe 29. means.
If the high level sensor 53 is not turned on, the tube pump 39 continues to be stopped.

  Subsequently, the control unit 43 determines whether or not the high level sensor 53 is turned off. The fact that the high level sensor 53 does not turn off even when the tube pump 39 is operated means that the tube pump 39 has failed or malfunctioned, and drainage is not sufficiently performed. Therefore, the control unit 43 displays alert information on the display unit 47.

If the high level sensor 53 is on, the control unit 43 next determines whether or not the low level sensor 55 is off.
If the low level sensor 55 is turned off, it means that the amount of drain in the storage unit 50B has decreased, and therefore the control unit 43 stops the operation of the tube pump 39. In this way, when the amount of drainage in the reservoir 50B decreases, the operation of the tube pump 39 is stopped, so that drainage in the reservoir 50B formed by the tube pump 39 is prevented.
If the low level sensor 55 is not turned off, the operation of the tube pump 39 is continued.

As described above, the tube pump 39 is in a stopped state for most of the time during the operation of the apparatus, and the tube pump 39 operates only after the high level sensor 53 is turned on and the low level sensor 55 is turned off. Only until.
As a modification of this embodiment, if the high level sensor 53 is turned on, the tube pump 39 is rotated forward for a predetermined time to drain the drain, and if the low level sensor 55 is turned off, the tube pump 39 is rotated reversely for a predetermined time. By doing so, there is a control to return the drain from a tank (not shown) on the downstream side of the tube pump 39 to the storage unit 50B side.
As described above, the control unit 43 allows the drain to be stored in an appropriate amount from the tube pump 39 to the first drain pipe 27 and the second drain pipe 29 (in this embodiment, the storage unit 50B). . In other words, drain overflow and depletion are unlikely to occur.

In this embodiment, unlike the first and second embodiments, it is not necessary to store moisture in the reservoir 50B first.
Moreover, in this embodiment, it can respond even if the number of drain piping increases.

4). Fourth Embodiment In the third embodiment, two water level sensors are used, but one water level sensor may be used. Such an embodiment will be described as a fourth embodiment. In addition, description is abbreviate | omitted about the same structure as 3rd Embodiment.

  As in FIG. 4, the second drain pipe 29 is provided with a high level sensor 53 below the second safety pot 35, but the low level sensor is omitted in this embodiment.

Next, drain discharge control of the pretreatment device 5 will be described.
The controller 43 drives the precooler 23 while driving the vacuum pump 25 to transfer the sample gas. At that time, the control unit 43 stops driving the tube pump 39.

Subsequently, the control unit 43 determines whether or not the high level sensor 53 is turned on. If the high level sensor 53 is on, the tube pump 39 is driven by the control unit 43. Thereby, the drain stored in the storage unit 50 </ b> B is discharged to the second discharge drain pipe 41 by the tube pump 39. Here, the fact that the high level sensor 53 is turned on means that the drain accumulated in the reservoir 50B is not sufficiently discharged for some reason, and the water level has risen to the upper part of the first drain pipe 27 and the second drain pipe 29. means.
If the high level sensor 53 is not turned on, the tube pump 39 continues to be stopped.

  The controller 43 drives the tube pump 39 for a predetermined time to discharge the drain in the reservoir 50B. As described above, since the tube pump 39 is operated only for a predetermined time, drain depletion in the reservoir 50B formed by the tube pump 39 is prevented.

Subsequently, the control unit 43 determines whether or not the high level sensor 53 is turned off. The fact that the high level sensor 53 has not been turned off even after the operation for a predetermined time means that the tube pump 39 has failed or malfunctioned, and drainage has not been sufficiently performed. Therefore, in that case, the control unit 43 displays alert information on the display unit 47.
If the high level sensor 53 is off, the control unit 43 stops the operation of the tube pump 39.

5. Fifth Embodiment To prevent drain depletion in the reservoir formed by the tube pump, the third embodiment stops the operation of the tube pump when the low level sensor is turned off, and the fourth embodiment operates for a predetermined time. If the high-level sensor was turned off after that, the tube pump was stopped. However, it is also possible to realize a structure that does not need to prevent drain depletion in the reservoir formed by the tube pump. Hereinafter, such an embodiment will be described as a fifth embodiment.

  A preprocessing device 5D according to the fifth embodiment will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as 4th Embodiment.

  A first check valve 67 and a second check valve 69 are provided above the first drain pipe 27 and the second drain pipe 29, respectively. The first check valve 67 and the second check valve 69 allow the drain to move downward, but prevent the sample gas from moving downward regardless of the presence or absence of the drain. In this embodiment, a floating check valve will be described, but another check valve having an equivalent function may be used. In this embodiment, the second check valve 69 is provided with a water level sensor 71. The water level sensor may be provided in either or both of the first check valve 67 and the second check valve 69.

  The first and second check valves 67 and 69 have a pot 73 and a float body 75. The pot 73 is a housing having openings at the top and bottom. The float body 75 is a sphere, for example, and is disposed in the pot 73.

  When there is no drain in the pot 73, the float body 75 closes the lower opening of the pot 73.

  When drain accumulates in the pot 73, the float body 75 floats and opens the lower opening of the pot 73. Thereby, drain flows to the tube pump 39 side, maintaining a gas sealing state. When the water level of the drain becomes high in the pot 73, the water level sensor 71 detects the drain level, and the tube pump 39 is driven to discharge the drain.

  In this apparatus, the sample gas from the drain separator 21 to the precooler 23 is prevented from flowing even if there is no drain in the storage unit 50C.

  Further, in this embodiment, when a large amount of drain is accumulated in the pot 73, the float body 75 closes the upper opening of the pot 73, thereby preventing further rise of the drain.

6). Sixth Embodiment In the first to fifth embodiments, a storage unit storing a certain amount of drain is used to realize a water seal state, but a water seal structure using drain is also realized by other means. . A sixth embodiment will be described as such an embodiment.

  A pre-processing device 5D in the sixth embodiment will be described with reference to FIG. Note that description of the same structure as that of the fifth embodiment is omitted.

  A first bolston filter 57 and a second bolston filter 59 are provided above the first drain pipe 27 and the second drain pipe 29, respectively. The first Bolston filter 57 and the second Bolston filter 59 have the property of allowing water to pass but having a large resistance to gas. Specifically, the first bolston filter 57 and the second bolston filter 59 are sponge-like porous members and can retain moisture.

When the drain is supplied to the first bolston filter 57 and the second bolston filter 59, the drain is dropped downward through the both and is discharged by the tube pump 39.
On the other hand, the sample gas cannot pass through the first bolston filter 57 and the second bolston filter 59 that are in a wet state by absorbing the drain.

  As described above, in this apparatus, the sample gas is passed from the drain separator 21 through the first drain pipe 27 and the second drain pipe 29 by the first bolston filter 57 and the second bolston filter 59, and the precooler 23. It is prevented from flowing up to.

In this apparatus, even if there is no drain on the upstream side of the tube pump 39, the sample gas is prevented from flowing around.
In the present embodiment, a filter other than the Bolston filter can be used as long as the above function is realized.
In this embodiment, it is not necessary to control the tube pump. In addition, it is possible to cope with an increase in the number of drain pipes.

7). Seventh Embodiment In the first to sixth embodiments, the sample gas is prevented from wrapping around by the water seal structure using the drain, but the prevention of the sample gas wraparound can be realized by other structures. is there. Such an embodiment will be described as a seventh embodiment.

  A pre-processing device 5E according to the seventh embodiment will be described with reference to FIG. FIG. 7 is a schematic configuration diagram of the gas analyzer. In addition, description is abbreviate | omitted about the same structure as 1st Embodiment.

  A three-way solenoid valve 61 is connected to the lower part of the first drain pipe 27 and the second drain pipe 29.

More specifically, the first drain pipe 27 is connected to the first port of the three-way solenoid valve 61, and the second drain pipe 29 is connected to the second port. Further, a drain pipe 63 extending downward is connected to the third port of the three-way solenoid valve 61. The drain pipe 63 is connected to the tube pump 39. The tube pump 39 discharges the drain to the second discharge drain pipe 65.
The three-way solenoid valve 61 is controlled by the control unit 43.

  The controller 43 alternately switches between the first state in which the first drain pipe 27 and the drain pipe 63 are connected and the second state in which the second drain pipe 29 and the drain pipe 63 are connected. The timing of switching and the time of each state can be set according to the operation status of the apparatus and the apparatus.

As described above, in this apparatus, the sample gas is prevented from flowing from the drain separator 21 through the first drain pipe 27 and the second drain pipe 29 to the precooler 23 by the three-way solenoid valve 61.
This embodiment is suitable when the pressure difference between the drain pipes is large.
In this embodiment, it is not necessary to control the tube pump.

8). Common Items of Embodiments The above-described embodiments have the following configurations in common.
The pretreatment device for gas analysis is a device for sucking exhaust gas flowing through a flue as a sample gas and pretreating the sample gas before supplying it to a gas analysis unit (for example, the gas analysis unit 11). The pretreatment device for gas analysis includes a first drain extraction device (for example, drain separator 21), a second drain extraction device (for example, precooler 23), a first drain pipe (for example, first drain pipe 27), and a first drain extraction device (for example, precooler 23). 2-drain piping (for example, second drain piping 29), pump (tube pump 39), and gas inflow prevention structure (for example, storage section 50, storage section 50A, storage section 50B, storage section 50C, first Bolston filter) 57, a second Bolston filter 59, and a three-way solenoid valve 61).
The first drain extraction device (for example, the drain separator 21) extracts drain in the sample gas.
The second drain extraction device (for example, the precooler 23) extracts drain in the sample gas.

The first drain pipe and the second drain pipe (for example, the first drain pipe 27 and the second drain pipe 29) are pipes for discharging drains discharged from the first drain extraction device and the second drain extraction device, respectively. Yes, they extend in the vertical direction and communicate with each other.
The pump (tube pump 39) can maintain a pressure difference between the inlet and the outlet, and sends out the drain discharged from the first drain pipe and the second drain pipe. The pump communicates with the first drain pipe and the second drain pipe.
In the gas inflow prevention structure, the sample gas flows from one (for example, the first drain extraction device) extraction device to the other (for example, the second drain extraction device) extraction device through the first drain piping and the second drain piping. To prevent that.

  In the first to seventh embodiments, a plurality of drain extraction devices arranged in series in one sample gas flow path are targeted for the present invention, but the present invention is not limited thereto. For example, in a pretreatment device that supplies sample gas collected at a plurality of locations to an analysis unit, a plurality of sample gas flow paths arranged in parallel, and a mixing tank or a switching valve to which the sample gas is supplied are provided. Have. Each sample gas flow path is provided with a plurality of drain separators and coolers. As an embodiment of the present invention, the drain pipes from the respective drain separators and coolers are collectively connected to the tube pump, so that the drain can be discharged from the plurality of drain pipes under the sample gas pressure to the atmospheric pressure side.

9. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.
In 1st Embodiment and 2nd Embodiment, although the storage part was formed with several piping, if the function of a storage part is implement | achieved, the shape and structure of each drain pipe will not be specifically limited.

The type and number of drain extraction devices are not limited to the above embodiment. For example, the combination of the types of drain extraction devices may be a drain separator and a cooler, between drain separators, between coolers, or between a plurality of drain separators and a plurality of coolers.
Also,

In order to prevent the sample gas from flowing from the drain separator to the precooler, for example, the first drain pipe extending from the drain separator may be a capillary.
You may provide a water level confirmation part in the drain piping of 3rd-5th embodiment.

  As a water seal structure for preventing the sample gas from flowing from the drain separator to the precooler, a drain trap made of a drain pipe bent in an S shape or a circle may be used.

  In the above embodiment, the third drain pipe that connects the first drain pipe and the second drain pipe is an elongated pipe. However, the third drain pipe may have a structure capable of storing drain such as a drain tank or a water tank.

  The present invention can be widely applied to a pretreatment apparatus for gas analysis, particularly a pretreatment apparatus for gas analysis for removing drain before the sample gas reaches the gas analysis section.

1: Gas analyzer 3: Probe tube 5: Gas analysis pretreatment device 11: Gas analyzer 15: Sample gas flow path 21: Drain separator 23: Precooler 25: Vacuum pump 27: First drain pipe 29: Second drain Piping 31: Third drain piping 32: Fifth drain piping 33: First safety pot 34: Connection piping 35: Second safety pot 37: Fourth drain piping 39: Tube pump 43: Control unit 50: Storage unit

Claims (7)

A pretreatment device for gas analysis for sucking a sample gas and processing the sample gas before supplying it to the gas analyzer,
A first drain extraction device for extracting drain in the sample gas;
A second drain extraction device for extracting drain in the sample gas;
A pipe for discharging the drain discharged from the first drain extraction device and the second drain extraction device, respectively, and a first drain pipe and a second drain pipe extending in the vertical direction and communicating with each other; ,
A drain sending device that is capable of maintaining a pressure difference between the inlet and the outlet, and is a device for sending out the drain discharged from the first drain pipe and the second drain pipe;
A gas inflow prevention structure for preventing the sample gas from flowing from the first drain extraction device to the second drain extraction device through the first drain piping and the second drain piping;
A pretreatment device for gas analysis.   The gas inflow prevention structure is provided between the first drain pipe and the second drain pipe, and is a water seal for storing drain discharged from the first drain extraction device and / or the second drain extraction device. The pretreatment device for gas analysis according to claim 1, which has a structure.   The water seal structure has a storage unit that stores the drain discharged from the first drain extraction device and / or the second drain extraction device and flows only the drain exceeding a predetermined amount to the drain delivery device side. The pretreatment apparatus for gas analysis according to claim 2. A third drain pipe connecting the first drain pipe and the second drain pipe;
A fourth drain pipe extending to the drain delivery device and connected to at least one of the first drain pipe, the second drain pipe, and the third drain pipe, further comprising: 4. The pretreatment device for gas analysis according to any one of 3 above.   The pretreatment apparatus for gas analysis according to claim 4, wherein the fourth drain pipe is connected to an intermediate part of the first drain pipe or an intermediate part of the second drain pipe.   The water seal structure includes a control unit that controls driving of the drain delivery device so that the drain can be stored from the drain delivery device to the first drain pipe and the second drain pipe. Item 3. The pretreatment device for gas analysis according to Item 2. A pretreatment device for gas analysis according to any one of claims 1 to 6,
A gas analyzer,
Gas analyzer equipped with.

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