JP3984364B2 - Gas analyzer sampling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a gas analyzer sampling device (hereinafter simply referred to as a sampling device).
[0002]
[Prior art]
For example, when continuously analyzing the gas flowing through the flue with a gas analyzer such as a NO _x meter, drain contained in the gas collected by the probe or the like is removed in advance, and a predetermined pressure that is as dry as possible is obtained. It is necessary to supply gas as a sample gas, and conventionally, a sampling device as shown in FIGS. 5 to 7 has been provided in front of the gas analyzer.
[0003]
That is, the sampling apparatus shown in FIG. 5 is a drain separator for removing the drain contained in the sample gas G in the sample gas flow path 2 that supplies the sample gas G to the gas analyzer 1 such as a NO _x meter. (Also referred to as a gas-liquid separator) 3, a filter 4 and a suction pump 5 are provided in this order from the upstream side, and a drain passage 6 connected to the drain separator 3 has a drain discharge hole 7 at a predetermined height position. A water seal trap 8 is provided.
[0004]
The sampling apparatus shown in FIG. 6 is the same as the sampling apparatus shown in FIG. 5 except that the suction pump 5 is provided upstream of the drain separator 3, and the other configuration is the same as the sampling apparatus shown in FIG. .
[0005]
The sampling apparatus shown in FIG. 7 is different from the sampling apparatus shown in FIG. 5 in that a drain pot 9 is provided in the drain flow path 6 connected to the drain separator 3 and the drain pot 9 Is provided with a sensor 10 for detecting the level of the drain D stored therein, a two-way valve 12 is provided in the drain discharge pipe 11 connected to the drain pot 9, and a controller (not shown) is shown on the basis of the detection result of the drain level sensor 10. The two-way valve 12 is opened via the valve D and the drain D in the drain pot 9 is automatically discharged. In FIG. 7, reference numeral 13 denotes a two-way valve protection filter provided at the drain outlet portion in the drain pot 9.
[0006]
[Problems to be solved by the invention]
However, the sampling devices shown in FIGS. 5 to 7 have the following problems. That is, in the sampling device shown in FIG. 5, it is necessary to change the water seal length L in accordance with the pressure of the sample gas G. When the gas analyzer 1 is accommodated in the panel, the corresponding range is used. There is a limit.
[0007]
In the sampling device shown in FIG. 6, since the suction pump 5 is provided upstream of the drain separator 3, there is no need to change the water seal length L in accordance with the pressure of the sample gas G, but the suction pump 5 Since the drain contained in the sample gas G enters, the suction pump 5 is prematurely deteriorated, and the measurement component is dissolved in the drain in the pump, resulting in loss of the measurement component.
[0008]
Further, in the sampling apparatus shown in FIG. 7, when the sample gas G supplied to the drain separator 3 is depressurized, the drain D in the drain pot 9 cannot be reliably discharged. .
[0009]
The present invention has been made in consideration of the above-mentioned matters, and its purpose is not to be affected by the pressure of the sample gas, and the drain separated and removed from the sample gas is automatically affected without adversely affecting the sampling of the sample gas. Furthermore, it is to provide a sampling device that can discharge reliably.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a drain separator for separating and removing drain contained in the sample gas is provided in the sample gas flow path for supplying the sample gas to the gas analyzer, and the drain separator is provided. In the sampling apparatus having a drain pot for receiving the drain separated by the above, a sensor for detecting the level of the drain stored in the drain pot is provided in the drain pot, and the drain pot is connected via a connecting / separating means. A second drain pot is connected, and an exhaust mechanism is connected to the second drain pot. Until the drain level in the drain pot (first drain pot) reaches a predetermined level, the connecting / separating means the first drain pot and a second drain pot are separated, as it becomes more than a predetermined level Wherein the connecting and separating means to connect the first drain pot and the second drain pot, a first drain in drain pot through the connection and separation means, a second drain exhausted by the exhaust mechanism It discharges to the pot side (Claim 1).
[0011]
In the sampling apparatus, whether or not the sample gas is in a pressurized state or a reduced pressure state, the drain stored in the drain pot that receives the drain separated by the drain separator can be surely automatically discharged.
[0012]
In the sampling device, a three-way valve is used as a connecting / separating means interposed between the first drain pot and the second drain pot, and a suction / pressure feeding mechanism is provided in the second drain pot. (Claim 2).
[0013]
Further, a two-way valve may be used as the connection / separation means, and a drain discharge pipe may be connected to the second drain pot.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. In addition, in the figure which shows each following embodiment, the same code | symbol as the code | symbol shown in FIGS. 5-7 shows the same thing or an equivalent.
[0015]
FIG. 1 is a diagram schematically showing one embodiment of a sampling apparatus according to the present invention. The difference from the one shown in FIG. 7 is that a drain pot 9 that receives drain D separated by a drain separator 3 is provided. Another drain pot is connected via a three-way solenoid valve as connection / separation means.
[0016]
That is, in FIG. 1, 14 is another drain pot (hereinafter referred to as the second drain pot 14) connected to the drain pot 9 (hereinafter referred to as the first drain pot 9) via the three-way solenoid valve 15. . That is, the three-way solenoid valve 15 has a first port 15 a connected to the pipe 16 a connected to the filter 13 of the first drain pot 9 and a second port 15 b connected to the lower part of the second drain pot 14. Further, a drain discharge pipe 17 is connected to the third port 15c.
[0017]
The second drain pot 14 temporarily stores the drain D. The second drain pot 14 includes a three-way solenoid valve 18, an air supply channel 19, an exhaust channel 20, and a suction pump 21. An air supply / exhaust mechanism 22 is connected. That is, the three-way solenoid valve 18 has a first port 18a connected to the upper portion of the second drain pot 14, a second port 18b connected to the air supply passage 19, and a third port 18c connected to the exhaust passage. 20 so as to be connected. The suction pump 21 is, for example, a double head type suction pump, and is provided so as to straddle the air supply passage 19 and the exhaust passage 20. An air filter 23 for protecting the pump is provided on the upstream side of the pump 21 in the air supply passage 19, and the upstream side thereof is open to the atmosphere. Further, the downstream side of the exhaust passage 20 from the pump 21 is open to the atmosphere.
[0018]
Although not shown, in the sampling device, the detection output from the drain level sensor 10 is input, and the opening / closing of the three-way solenoid valves 15 and 18 is switched based on this or based on the timer circuit. A controller is provided.
[0019]
The operation of the sampling apparatus having the above configuration will be described. First, the three-way solenoid valves 15 and 18 are initially off. Therefore, in the three-way solenoid valve 15, the port 15a and the port 15b are not in communication with each other, whereas the port 15b and the port 15c are in communication with each other. In the three-way solenoid valve 18, the port 18a and the port 18b communicate with each other, but the port 18a and the port 18c do not communicate with each other. The pump 21 is not operating.
[0020]
By operating the pump 5 in the above state, the sample gas G flows in the sample gas flow path 2 in the direction of the gas analyzer 1. The sample gas G is separated into gas and drain D in the drain separator 3, and the dried gas separated from the drain D is supplied to the gas analyzer 1, and the separated drain D passes through the drain channel 6. It flows into the first drain pot 9. In this state, since the three-way solenoid valve 15 is off, the drain D in the first drain pot 9 does not flow out in the direction of the second drain pot 14 and is stored in the first drain pot 9. Is done.
[0021]
When the drain D stored in the first drain pot 9 reaches a predetermined level, the drain level sensor 10 detects this and the output is sent to the controller. The three-way solenoid valves 15 and 18 are turned on by a control signal from the controller that has received this detection output. As a result, in the three-way solenoid valve 15, the port 15a and the port 15b communicate with each other, and the port 15b and the port 15c do not communicate with each other. In the three-way solenoid valve 18, the port 18a and the port 18c communicate with each other, and the port 18a and the port 18b do not communicate with each other. Further, the pump 21 is turned on and a suction operation state is set.
[0022]
As described above, the open / close state of the three-way solenoid valves 15 and 18 is switched and the pump 21 is turned on, so that the air in the second drain pot 14 is exhausted to the outside via the exhaust passage 20 by the pump 21. Is done. As a result, the drain D in the first drain pot 9 is sucked in the direction of the second drain pot 14, whereby the drain D in the first drain pot 9 passes through the three-way solenoid valve 15 and the second drain drain. It is transferred to the pot 14 and stored therein.
[0023]
When a predetermined set time (this time is sufficient for all of the drain D in the first drain pot 9 to be transferred into the second drain pot 14) elapses, The three-way solenoid valves 15 and 18 are switched off by the control signal. Thereby, in the three-way solenoid valve 15, the port 15a and the port 15b are not communicated, and the port 15b and the port 15c are communicated. In the three-way solenoid valve 18, the port 18a and the port 18b are communicated. The port 18a and the port 18c are not in communication.
[0024]
As described above, the open / closed state of the three-way solenoid valves 15 and 18 is switched again, and the pump 21 continues to be turned on, so that the air sucked into the air supply passage 19 via the filter 23 is second. It is supplied in the direction of the drain pot 14. As a result, the drain D temporarily stored in the second drain pot 14 is pushed out of the second drain pot 14, flows into the drain discharge pipe 17 through the three-way solenoid valve 15, and drain outlet (not shown) Is not discharged in the direction.
[0025]
Then, when a predetermined set time has elapsed (this time may be sufficient time for all of the drain D in the second drain pot 14 to be discharged), the pump 20 is controlled by the control signal from the controller. It is switched off and the drain D is completely discharged.
[0026]
In the embodiment shown in FIG. 1, the three-way solenoid valve 18 or the double head type suction pump 21 is used as a constituent member of the suction / exhaust mechanism 22, but when instrumentation air can be used, As shown in FIG. That is, in the embodiment shown in FIG. 2, normally closed two-way electromagnetic valves 24 and 25 are interposed in the air supply passage 19 and the exhaust passage 20, respectively. The upstream side of the valve 24 is connected to an instrument air source (not shown), and a single head type suction pump 26 is provided on the downstream side of the two-way solenoid valve 25 in the exhaust passage 20. The downstream side is open to the atmosphere. Needless to say, the two-way solenoid valves 24 and 25 and the pump 26 are controlled by signals from the controller.
[0027]
In the operation of the sampling apparatus configured as shown in FIG. 2, when the drain D is transferred from the first drain pot 9 to the second drain pot 14, the two-way solenoid valve 25 is opened. In addition, when the pump 26 is operated for suction and the drain D temporarily stored in the second drain pot 14 is discharged through the three-way solenoid valve 17, the two-way solenoid valve 24 is opened and instrumented. The other operations are the same as those of the sampling apparatus shown in FIG. 1 except that air is supplied in the direction of the second drain pot 14.
[0028]
FIG. 3 should also be referred to as a modification of the embodiment shown in FIG. 2. In this embodiment, a pipe 27 that serves as both air supply and exhaust is connected to the upper portion of the second drain pot 14. The supply / exhaust pipe 27 is provided with a three-way solenoid valve 28. The three-way solenoid valve 28 has a first port 28a on the second drain pot 14 side and an instrument air supply pipe 29 on the second port 28b. The exhaust port 31 provided with the suction pump 30 is connected to the third port 28c, and the drain D can be automatically discharged by appropriately controlling the three-way solenoid valve 28 and the suction pump 30 by a controller.
[0029]
In any of the above-described embodiments, the drain D temporarily stored in the second drain pot 14 is provided between the second drain pot 14 and the first drain pot 9 in order to discharge the drain D. Although the three-way solenoid valve 15 is used, instead of the three-way solenoid valve 15, a two-way solenoid valve is used to discharge the drain D in the second drain pot 14 in the second drain pot 14. It may be.
[0030]
FIG. 4 shows an embodiment configured in this manner. In this figure, reference numeral 32 denotes a normally closed two-way solenoid valve for connecting between the first drain pot 9 and the second drain pot 14. The ports 32a and 32b are connected to the pipes 16a and 16b, respectively. A drain discharge pipe 33 is connected to the lower portion of the second drain pot 14 and includes a normally closed two-way electromagnetic valve 34. Reference numeral 35 denotes an air supply pipe connected to the upper portion of the second drain pot 14 and includes a normally closed two-way electromagnetic valve 36.
[0031]
In the sampling device shown in FIG. 4, the drain D in the first drain pot 9 can be transferred to the second drain pot 14 by opening the two-way electromagnetic valve 32. When discharging the drain D in the second drain pot 14, the two-way solenoid valve 32 is closed and the two-way solenoid valves 34 and 36 are opened. It goes without saying that the opening / closing control of these two-way solenoid valves 32, 34, 36 is performed by a controller.
[0032]
In each of the above-described embodiments, the drain amount in the first drain pot 9 is monitored by the drain level sensor, but the amount of the drain D contained in the sample gas G is always constant. In such a case, the monitoring may be performed using a timer.
[0033]
【The invention's effect】
In the sampling device of the present invention, a sensor for detecting the level of the drain stored in the first drain pot that receives the drain separated by the drain separator is provided and connected to the first drain pot. The second drain pot is connected via the separating means, and the exhaust mechanism is connected to the second drain pot. The connecting / separating means until the drain level in the first drain pot reaches a predetermined level. The first drain pot and the second drain pot are separated by the above, and when the level becomes equal to or higher than a predetermined level , the first drain pot and the second drain pot are connected by the connecting / separating means. The drain in the pot is configured to be discharged to the second drain pot side exhausted by the exhaust mechanism through the connection / separation means. In, without being influenced in the pressure of the sample gas, it is possible to automatically discharge drain.
[0034]
In the sampling apparatus according to the present invention, the sample gas collection line is not adversely affected, so that desired gas analysis can be performed.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing one embodiment of a sampling apparatus according to the present invention.
FIG. 2 is a diagram schematically showing another embodiment of the sampling device.
FIG. 3 is a diagram partially showing another embodiment of the sampling device.
FIG. 4 is a diagram partially showing another embodiment of the sampling device.
FIG. 5 is a diagram for explaining a conventional sampling device;
FIG. 6 is a diagram for explaining a conventional sampling device.
FIG. 7 is a diagram for explaining a conventional sampling device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas analyzer, 2 ... Sample gas flow path, 3 ... Drain separator, 9 ... 1st drain pot, 10 ... Drain level sensor, 14 ... 2nd drain pot, 15, 32 ... Connection / separation means, 17 33 ... Drain discharge pipe, 22 ... Air supply / exhaust mechanism, D ... Drain, G ... Sample gas

Claims (3)

The sample gas flow path for supplying the sample gas to the gas analyzer is provided with a drain separator for separating and removing the drain contained in the sample gas, and a drain pot for receiving the drain separated by the drain separator. In the gas analyzer sampling device, the drain pot is provided with a sensor for detecting the level of the drain stored therein, and a second drain pot is connected to the drain pot via connection / separation means. Further, an exhaust mechanism is connected to the second drain pot, and the first drain pot is connected to the first drain pot by the connecting / separating means until the drain level in the drain pot (first drain pot) reaches a predetermined level. the second drain pot are separated, the connecting and separating means when it is above a predetermined level A first drain pot and second drain pot is connected, the first drain in drain pot through said connecting and separating means to discharge the second drain pot side which is evacuated by the exhaust mechanism A gas analyzer sampling device characterized by the above.   The sampling apparatus for a gas analyzer according to claim 1, wherein the connecting / separating means comprises a three-way valve, and an air supply / exhaust mechanism is provided in the second drain pot.   The sampling device for a gas analyzer according to claim 1, wherein the connecting / separating means comprises a two-way valve, and a drain discharge pipe is connected to the second drain pot.

Images