JP2017090365A - Gas sampler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas sampler which prevents clogging of a filter by preventing a gas under measurement containing a large amount of dust from directly reaching the filter, and by capturing the dust in the gas under measurement, thereby enabling prolonged use of the filter and reducing burden of maintenance.SOLUTION: A gas sampler 1 includes an intermediate section body 21 with a buffer space 24 extending from a sampling flow channel 11 of a sampling tube 10 in a coaxial direction, and a gas introduction tube 22 with an introduction flow channel 25 that forms a substantially T-shaped intersection with a midsection of the buffer space 24 to be in communication therewith.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas collector for collecting a measurement target gas.

  In some cases, the gas analyzer uses a measurement target gas containing a large amount of dust as an analysis target. The measurement target gas containing dust is, for example, a combustion exhaust gas containing soot dust discharged from a boiler that burns coal or the like, an environmental gas containing dust collected around a road where there is a lot of vehicle exhaust gas, a cement plant, etc. A process gas that is exhausted from and contains dust can be considered. Then, the gas analyzer collects and analyzes the measurement target gas containing a large amount of dust such as these.

  When collecting a gas to be measured that contains a lot of dust, a gas collector is provided in front of the gas analyzer. This gas sampling device removes dust from a measurement target gas containing a large amount of dust and then supplies the gas to a gas analyzer, and is used as one of pretreatment devices.

  The prior art of this gas sampling device will be described with reference to FIGS. As shown in FIG. 6, the gas collector 100 includes a sampling tube 110, a lid 120, a collector main body 130, a filter 140, a collector outlet (inner filter purge purge port) 150, and a filter outer spray purge port 160. Yes.

  The collection tube 110 is inserted at its tip to a collection point where the measurement target gas actually exists, such as in a flue for combustion exhaust gas, and directly collects the measurement target gas. A lid 120 is fixed to the other end of the sampling tube 110. A collector main body 130 which is a bottomed cylindrical case is also fixed to the lid 120. The lid 120 and the collector main body 130 form a hollow cylindrical inner space 130a filled with the measurement target gas. The lid 120 is provided with a hole, and the measurement target gas flowing through the collection tube 110 passes through the hole in the lid 120 and flows into the internal space 130 a of the collector main body 130.

  The internal space 130a contains a hollow cylindrical filter 140 that is coaxial with the hollow cylindrical internal space 130a and for removing dust in the measurement target gas. A circular tip portion 140 a is formed at the top of the filter 140. The filter 140 is made of various materials such as metal, resin, filter paper, etc. However, when corrosion resistance is required, the metal filter is often used by heating it above the acid dew point.

  When the measurement target gas is collected, the measurement target gas is introduced from the collection tube 110 and taken from the outside to the inside of the filter 140 as shown by the flow indicated by the solid line arrow in FIG. Since the pressure on the flue side is high, the gas to be measured that has flowed into the internal space 130a of the collector main body 130 from the sampling tube 110 reaches the distal end portion 140a and passes from the outside to the inside of the filter 140, and the collector outlet A gas flow toward the (inner filter blow purge port) 150 is formed. When the measurement target gas passes through the filter 140 (particularly the tip portion 140a), the filter 140 collects dust contained in the measurement target gas, and the dust is removed from the measurement target gas. Dust-removed measurement target gas is led out from the collector outlet 150 and led to a gas analyzer (not shown).

  When such a gas sampling device 100 is used for a long period of time, dust accumulates on the filter 140 (particularly the tip portion 140a), causing clogging, and a new measurement target gas can be guided to the gas analyzer. Disappear. Therefore, purging is performed at regular intervals to forcibly blow off the dust accumulated on the surface of the filter 140.

  As a purge method, a purge gas (hereinafter simply referred to as a purge gas) by nitrogen gas or instrument air is introduced into the inside of the filter 140 through the purge blow port 150 in the filter as shown by the flow of the arrow shown by the solid line in FIG. In general, the purge gas is allowed to flow from the inside to the outside of the filter 140 to blow away dust accumulated on the surface of the filter 140.

  Further, in addition to the purge from the inside, as indicated by the flow of the arrow shown by the broken line in FIG. 7, the purge gas is caused to flow from the filter outer blowing purge port 160, and this purge gas is blown to the outer surface of the filter 140, Dust accumulated on the outer surface of the filter 140 is blown away. The dust blown off by the purge inside and outside the filter is discharged into the flue through the collection tube 110.

  A similar conventional technique is also disclosed in Patent Document 1. The “cleaning device for the filter for the gas collector” in Patent Document 1 is a cleaning device for the filter for the exhaust gas collector for the exhaust gas generated in the oxygen blowing converter. As shown in FIG. 1 of Patent Document 1, the exhaust gas collector 1 sucks the exhaust gas in the flue through the filter 2 protruding inside the flue 33 of the converter exhaust gas. Further, the exhaust gas collector 1 has a cylindrical case 1b that protrudes inside the flue and is disposed so as to surround the outer periphery of the filter.

  When purging, the purge pipe 12 connected to the purge gas source 11 branches, and purge gas is introduced into the inside of the filter 2 through the outlet portion 1a and to the outer surface of the filter 2 through the case 1b. Is done. The purge gas is used to blow the inside and outside of the filter 2 to remove the dust of the exhaust gas adhering to the filter 2.

JP 62-116232 A (Fig. 1 etc.)

  In the prior art described with reference to FIGS. 6 and 7, the sampling tube 110 and the filter 140 are linearly arranged, and the outlet of the sampling tube 110 and the tip portion 140 a of the filter 140 face each other. Therefore, the amount of measurement target gas sucked from the tip portion 140a increases, and a large amount of collected dust is firmly fixed and accumulated at the tip portion 140a, and clogging is likely to occur. The filter 140 has a small amount of gas to be measured from the outer surface surrounded by the collector main body 130, and is less clogged with dust than the tip 140a. Therefore, the amount of dust accumulated in the filter 140 varies depending on the location.

  In such a case of purging the filter 140, when discharging from the inside of the filter 140 to the outside via the collector outlet (inside filter purge port) 150, not the tip 140 a but the filter 140. Since the purge gas is discharged from the outer surface that is less clogged and easily passes through, the dust on the outer surface is removed, and the purge gas flows from the outer surface that is further easier to pass, so that the dust cleaning effect of the tip 140a is effective. An event of lowering was confirmed.

  In addition, when spraying to the outer surface of the filter 140 through the filter outer blow purge port 160, only the dust on the outer surface with less clogging was removed, and it was also confirmed that the dust cleaning effect of the tip portion 140a was low. Thus, purging of the front end portion 140a has not been easy.

  As described above, in the conventional gas sampling device 100, although purging has been performed, a portion that cannot be passed by the filter 140 may remain and the reduction in the sampling ability of the measurement target gas may not be resolved. A new problem that was not noticed was discovered. Such a problem is a problem that can occur in the apparatus of Patent Document 1 as well.

  Therefore, the present invention has been made in view of the above problems, and its purpose is to prevent measurement target gas containing a large amount of dust from directly reaching the filter and to collect dust in the measurement target gas. Accordingly, it is an object of the present invention to provide a gas sampling device that prevents clogging of the filter and that can be used for a long period of time to reduce maintenance work.

A gas extractor according to claim 1 of the present invention comprises:
A sampling tube formed with a sampling channel through which the gas to be measured flows;
An intermediate body that is connected to the sampling pipe and has a buffer space into which the measurement target gas flows from the sampling flow path, and an introduction flow path that is connected to the intermediate section main body and into which the measurement target gas flows from the buffer space. An intermediate portion having a gas introduction pipe formed;
A collector main body having an internal space connected to the gas introduction pipe in the intermediate portion and into which the measurement target gas flows from the introduction flow path;
A filter that is disposed in the center of the internal space of the collector main body and removes dust contained in the measurement target gas when passing from the outside to the inside;
A collector outlet for taking out the gas to be measured that has passed to the inside of the filter to the outside of the collector main body;
With
The buffer space of the intermediate body is a space extending in the same direction as the sampling flow path of the sampling pipe, and the introduction flow path of the gas introduction pipe intersects in a trifurcated manner in the middle of the buffer space. Thus, the gas sampling device is characterized in that it communicates as described above.

A gas collector according to claim 2 of the present invention is
The gas collector according to claim 1, wherein
The gas collector is characterized in that the shape formed by the buffer space and the introduction flow path is substantially T-shaped.

Further, a gas collector according to claim 3 of the present invention is
The gas collector according to claim 1, wherein
The gas collector is characterized in that the shape formed by the buffer space and the introduction flow path is substantially Y-shaped.

A gas collector according to claim 4 of the present invention is
In the gas extractor according to any one of claims 1 to 3,
The gas collector is provided with an intermediate purge port for introducing a purge gas into the buffer space, and is capable of performing an intermediate purge for removing dust accumulated in the buffer space and the sampling flow path. .

A gas collector according to claim 5 of the present invention is
The gas collector according to claim 4, wherein
An in-filter blow purge port that communicates with the inside of the filter and introduces purge gas so as to pass from the inside to the outside of the filter, and removes dust accumulated on the outer surface of the filter. The gas sampling device was characterized in that partial purge could be performed alternately.

A gas collector according to claim 6 of the present invention is
The gas collector according to claim 4 or 5,
A filter external blow purge port that communicates with the collector main body and that introduces a purge gas so as to be blown to the outer surface of the filter, and removes dust accumulated on the outer surface of the filter, and the intermediate portion purge. The gas sampling device is characterized in that it can be alternately performed.

  According to the present invention, the measurement target gas containing a large amount of dust is prevented from directly reaching the filter, and the dust in the measurement target gas is collected to prevent the filter from being clogged. It is possible to provide a gas sampling device that can be used and can reduce maintenance work.

It is a lineblock diagram of the gas sampler of the 1st form for carrying out the present invention. It is explanatory drawing of the flow of the gas at the time of the in-filter blow purge in the gas extractor of the 1st form. It is explanatory drawing of the gas flow at the time of the filter external blowing purge in the gas sampling device of a 1st form. It is explanatory drawing of the gas flow at the time of the intermediate part purge in the gas collector of a 1st form. It is a block diagram of the gas sampling device of the 2nd form for implementing this invention. It is a block diagram of the gas collector of a prior art. It is explanatory drawing of the flow of the gas at the time of the purge of the gas sampling device of a prior art.

  Subsequently, a gas collector according to a first embodiment for carrying out the present invention will be described below with reference to FIG. As shown in the dashed frame in FIG. 1, the gas sampling device 1 includes a sampling tube 10, an intermediate portion 20, and a collector main body 30. In the present embodiment, for the sake of concrete explanation, the gas collector 1 is described as being attached to a flue (not shown) through which the combustion exhaust gas of the boiler flows, and further a gas fluid circuit is formed.

  The sampling tube 10 is a cylinder formed of a corrosion-resistant material having corrosion resistance and heat resistance such as stainless steel or glass. A sampling channel 11 is formed in the sampling tube 10. The sampling tube 10 is attached in a state of being penetrated to a wall body (not shown) constituting a flue or the like, and the opening at the tip is inserted to the actual sampling point where the combustion exhaust gas exists. In the attachment location, you may make it connect via a flexible structure part which absorbs a vibration, for example, a flexible tube (not shown). Further, the attachment to the wall body may be a detachable configuration. The collection pipe 10 takes in and collects combustion exhaust gas containing dust flowing in the flue from its tip as a measurement target gas.

  The intermediate part 20 further includes an intermediate part main body 21, a gas introduction pipe 22, an intermediate part purge port 23, a buffer space 24, and an introduction flow path 25.

The intermediate part main body 21 further includes a cylindrical body 21a, a lid part 21b, and a butting part 21c.
The cylinder 21a is a cylinder made of a corrosion-resistant material. The lid portion 21b is fixed at one end (lower side in FIG. 1) of the cylindrical body 21a, and connects the sampling tube 10 and the cylindrical body 21a. The abutting portion 21c is fixed at the other end (upper side in FIG. 1) of the cylindrical body 21a. A buffer space 24 that is partitioned by the cylindrical body 21a, the lid portion 21b, and the abutting portion 21c and that extends in the flow direction of the measurement target gas is formed in the intermediate portion main body 21 in a hollow cylindrical shape.

  The gas introduction pipe 22 is a cylindrical body made of a corrosion-resistant material. An introduction channel 25 is formed inside. The gas introduction pipe 22 is attached to a substantially middle position of the intermediate body 21.

  The intermediate purge port 23 is formed in the abutting portion 21 c and is an inlet for introducing purge gas into the buffer space 24 as will be described later.

  The collector main body 30 further includes a main body container 31, a filter 32, a collector outlet (internal filter purge purge port) 33, an external filter purge purge port 34, and an internal space 35.

  The main body container 31 is a hollow cylindrical case made of a corrosion-resistant material, and forms an internal space 35. Although not shown, a lid that can be opened and closed for the filter 32 is also provided. The main body container 31 is connected to the gas introduction pipe 22. Thereby, the collection flow path 11, the buffer space 24, the introduction flow path 25, and the internal space 35 are in communication.

  The filter 32 has a hollow cylindrical shape, and a circular tip 32 a is formed at a location facing the opening of the gas introduction tube 22. The filter 32 is made of various materials such as metal, resin, filter paper, etc. for removing dust, and is formed by forming a mesh body with an appropriate mesh shape for removing dust reliably into a hollow cylindrical shape. In addition, when corrosion resistance is required, it is often used by heating a metal filter above the acid dew point.

  The filter 32 is disposed coaxially with the cylindrical internal space 35 in the hollow cylindrical main body container 31 and at the center of the internal space 35. By disposing the filter 32 in the center of the internal space 35 where the flow velocity of the measurement target gas is large, the amount of the measurement target gas sucked from the filter 32 is increased. Furthermore, the front end portion 32a of the filter 32 faces the opening of the gas introduction pipe 22, and there are many measurement target gases that pass through the front end portion 32a. Therefore, by increasing the area of the distal end portion 32a, the amount of measurement object gas sucked is increased. Such measurement target gas passes from the outside to the inside of the filter 32. At this time, dust contained in the measurement target gas is collected by the filter 32 and removed from the measurement target gas.

  The collector outlet (in-filter blowing purge port) 33 communicates with the inner space of the filter 32, and serves as both the collector outlet and the in-filter blowing purge port. When acting as the collector outlet, the measurement target gas containing dust passes from the outside to the inside of the filter 32, and the measurement target gas from which the dust has been removed is led out from the inside of the filter 32. Further, when acting as an in-filter blow purge port, purge gas is introduced inside the filter 32, and purge gas is jetted from the inside to the outside of the filter 32 to blow away dust accumulated on the outer surface of the filter.

  The filter outer blow purge port 34 communicates with the internal space 35 of the main body container 31 and allows purge gas to flow in. This purge gas is blown to the outer surface of the filter 32, and dust accumulated on the outer surface of the filter 32 is blown off by the purge gas pressure so as to peel off from the filter 32. The gas collector 1 is like this.

  The gas collector 1 is novel in that an intermediate portion 20 is provided between the sampling tube 10 and the collector main body 30 as compared with the prior art. Further, the intermediate portion 20 is novel in that the shape of the intermediate portion main body 21 and the gas introduction pipe 22 is substantially T-shaped, and the flow passage shape of the buffer space 24 and the introduction flow passage 25 is substantially T-shaped. The effect of this feature will be described later.

  The gas collector 1 constitutes a gas fluid circuit when in use. This gas fluid circuit includes a measurement target gas passage valve 40, a filter inner blow purge valve 50, a filter outer blow purge valve 60, an intermediate purge valve 70, and a pipe line.

  The measurement target gas passage valve 40 is connected to a collector outlet (in-filter blow purge port) 33 via a pipe line, and opens and closes a flow path to a gas analyzer (not shown) in the subsequent stage.

  The in-filter blow purge valve 50 is connected to the collector outlet (in-filter blow purge port) 33 via a pipe line. A purge gas is supplied to the filter inner blow purge valve 50, and a flow path is formed to flow the purge gas to the inside of the filter 32 when the filter inner blow purge valve 50 is opened.

  The filter outer blowing purge valve 60 is connected to the filter outer blowing purge port 34 via a pipe line. A purge gas is supplied to the filter outer blowing purge valve 60, and when the filter outer blowing purge valve 60 is opened, the purge gas is blown to the outer surface of the filter 32 through the pipe line and the filter outer blowing purge port 34. Form a road.

  The intermediate part purge valve 70 is connected to the intermediate part purge port 23 via a pipe line. A purge gas is supplied to the intermediate purge valve 70, and when the intermediate purge valve 70 is opened, the purge gas is introduced into the buffer space 24 and the collection flow channel 11 through the pipe line and the intermediate purge port 23. A flow path is formed.

  Next, the use of the gas collector 1 will be described. First, gas sampling will be described with reference to FIG. The internal filter purge valve 50, the external filter purge valve 60, and the intermediate purge valve 70 are closed to prevent purge gas from flowing, and the measurement target gas passage valve 40 is opened. A part of the combustion exhaust gas is sampled from an upstream flue (not shown) and used as a measurement target gas. After removing dust from the measurement target gas, it flows to a gas analyzer downstream.

  This flue gas is very hot and the pressure on the flue side is high. Therefore, a flow path of the measurement target gas that flows from the flue to the gas analyzer through the collection pipe 10, the intermediate portion 20, the collector main body 30, and the measurement target gas passage valve 40 is formed.

  Even when the pressure is insufficient, the gas to be measured flows to the gas analyzer through the sampling tube 10, the intermediate unit 20, the collector main body 30, and the gas to be measured gas passage valve 40 by a suction pump of the gas analyzer (not shown). A flow path is formed.

  The gas to be measured enters the intermediate portion 20 through the sampling tube 10. The shape of the intermediate part 20 is substantially T-shaped. The measurement target gas flows into the collection channel 11 and the buffer space 24 on a straight line and collides with the abutting portion 21c. During the collision, a lot of dust adheres and accumulates on the surface of the abutting portion 21c. There is no problem even if dust accumulates on the abutting portion 21c. The gas to be measured after colliding at the abutting portion 21 c and removing relatively large dust flows backward to the introduction flow path 25.

  In the internal space 35, the pressure outside the filter 32 increases and the pressure inside the filter 32 decreases, and the gas to be measured is sucked inward through the filter 32. The remaining dust that could not be collected by the intermediate portion 20 is collected by the filter 32. Since the measurement target gas that has passed through the intermediate portion 20 has a small amount of dust, the measurement target gas is efficiently sucked by the distal end portion 32a of the filter 32, and the accumulation of dust at the distal end portion 32a is also small.

  In the gas sampling device 1 configured as described above, in particular, in the intermediate portion 20 provided at the front stage of the filter 32, the abutting portion 21 c where the flow of the measurement target gas collides is formed in the intermediate portion 20 on the upstream side of the collector main body 30. Since a large amount of dust in the measurement target gas accumulates at the abutting portion 21c, all dust flows into the collector main body 30 as in the prior art, and a large amount of dust is generated at the tip 32a of the filter 32. This prevents a situation where the filter 32 is clogged due to accumulation.

  Subsequently, the purge by the gas collector 1 will be described. In the gas collector 1, dust is gradually accumulated on the filter 32 by inhaling the measurement target gas including dust. If the amount of dust deposited on the filter 32 increases, the gas to be measured cannot be taken into the gas analyzer, so that the dust adhering to the filter 32 needs to be removed. Therefore, a purge for removing the accumulated dust is periodically performed.

  First, as shown in FIG. 2, the internal blow purge of the filter 32 is performed. First, the purge gas does not flow to the gas analyzer with the measurement target gas passage valve 40 closed. Then, with the filter outer blow purge valve 60 and the intermediate purge valve 70 closed, the filter blow purge valve 50 is opened, so that the purge gas flows into the filter 32.

  In this case, the purge gas is caused to flow from the inside to the outside of the filter 32, and the purge gas is ejected from the holes on the entire surface of the filter 32 as indicated by the arrows in FIG. The purge gas ejected from the hole has a considerable gas pressure, and blows away dust accumulated on the entire outer surface of the filter 32. The amount of dust adhering to the tip portion 32a is less than that of the prior art, and the dust is blown off from the tip portion 32a.

  The purge gas and dust fill the internal space 35, but the purge gas containing dust flows so as to return to the flue through the internal space 35, the introduction flow path 25, the buffer space 24, and the collection flow path 11. In this returning flow path, the flow is stirred particularly against the inner wall surface of the cylinder 21a, and a part of the dust accumulated in the buffer space 24 is blown off, and this dust also returns to the flue. Thereby, in addition to the filter 32, some dust in the flow path to the flue can also be removed.

  Subsequently, as shown in FIG. The purge gas is prevented from flowing to the gas analyzer as the measurement target gas passage valve 40 is closed. Then, with the filter inner blow purge valve 50 and the intermediate purge valve 70 closed, the filter outer blow purge valve 60 is opened and the purge gas flows into the inner space 35 and blows to the outer surface of the filter 32. To do.

  In this case, as indicated by an arrow in FIG. 3, when purge gas is blown to the outer surface of the filter 32, the purge gas turns along the outer surface and blows away dust accumulated on the entire outer peripheral surface of the filter 32.

  The purge gas and dust fill the internal space, but the purge gas containing dust flows so as to return to the flue through the internal space 35, the introduction flow path 25, the buffer space 24, and the collection flow path 11. In this return flow path, the flow is stirred particularly against the inner wall surface of the cylinder 21a, and a part of the dust accumulated in the buffer space 24 is blown away, so that this dust also returns to the flue. Thereby, in addition to the filter 32, some dust in the flow path to the flue can also be removed.

  In addition, dust may be blown off by simultaneously or alternately performing the filter inner blow purge and the filter outer blow purge.

  Subsequently, as shown in FIG. 4, purging of the intermediate portion 20 is performed. The purge gas is prevented from flowing to the gas analyzer as the measurement target gas passage valve 40 is closed. Then, in a state where the filter inner blow purge valve 50 and the filter outer blow purge valve 60 are closed, the intermediate purge valve 70 is opened so that the purge gas flows into the buffer space 24 of the intermediate portion 20.

  In this case, the purge gas flows as shown by the arrows in FIG. 4, and in particular, dust that accumulates on the abutting portion 21 c in the buffer space 24 is blown off. Further, the flow strikes around the hole of the lid portion 21b and the dust in the buffer space 24 is blown away. In addition, part of the dust that passes through the introduction flow path 25 of the gas introduction pipe 22 and accumulates on the tip 32 a of the filter 32 is blown off.

  A part of the purge gas containing dust in the intermediate portion 20 flows into the internal space 35 of the collector main body 30, but most of the other purge gas containing dust passes through the buffer space 24 and the sampling flow path 11. It flows back to the flue. Thereby, the dust in the buffer space 24 to the flue and the sampling channel 11 can also be removed.

  Purging is performed by sequentially repeating such an in-filter blow purge, an out-filter blow purge, and an intermediate portion purge. Various other purge methods are conceivable. Here, when the flow of the purge gas in the introduction flow path 25 is seen, the purge gas flows toward the collector main body 30 in the intermediate purge, and the purge gas flows toward the intermediate portion 20 in the filter inner blow purge and the filter outer blow purge. Therefore, by alternating the purge operations of the two, the flows do not interfere with each other, and each purge operation can be performed reliably.

  Therefore, after performing a purge for alternately repeating the intermediate purge and the in-filter blow purge for a predetermined period, it is also possible to perform a purge for alternately repeating the intermediate purge and the external filter purge for a predetermined period. Further, the intermediate portion purge and the simultaneous in-filter / outlet purge may be alternately performed. Further, since at least the intermediate portion purge and other purges may be performed alternately, the purge that alternately performs the intermediate portion purge and the in-filter blow purge, or the purge that alternately performs the intermediate portion purge and the outside filter purge. good.

  In any case, the dust is removed completely by spraying purge gas from multiple directions to the internal space 35, the filter 32, and the buffer space 24 of the intermediate portion 20 in the main body container 31.

  Subsequently, a gas collector according to a second embodiment for carrying out the present invention will be described below with reference to FIG. As shown in the dashed frame in FIG. 5, the gas collector 2 includes a sampling tube 10, an intermediate portion 20 ′, and a collector main body 30. Compared with the first embodiment described with reference to FIGS. 1 to 4 in the present embodiment, the intermediate portion 20 ′ is adopted instead of the intermediate portion 20 of the first embodiment. The collector main body 30 is assumed to be the same as that of the first embodiment, and the same reference numerals are given, and redundant description thereof is omitted. Further, the intermediate part 20 ′ is also attached with only the connection angle between the intermediate part main body 21 and the gas introduction pipe 22 ′ being different, and the other parts are the same as those in the first embodiment, and are given the same reference numerals. In addition, the overlapping description is omitted. Hereinafter, only the connection angle and its operation will be described.

  Compared with the prior art, the gas collector 2 is novel in that it has an intermediate portion 20 ′ between the sampling tube 10 and the collector main body 30. Further, in the intermediate portion 20 ′, the shape of the intermediate portion main body 21 and the gas introduction pipe 22 ′ is substantially Y-shaped, and the flow passage shape of the buffer space 24 and the introduction flow passage 25 in the intermediate portion 20 ′ is formed in a substantially Y-shape. The point is new.

  The gas collector 2 has the same effect when used in the same manner as the gas collector 1 described above. Particularly, since it has a substantially Y shape, dust scattered in the internal space 35 due to the purge. However, since the inside of the inclined introduction channel 25 of the gas introduction pipe 22 'descends in the direction of the broken arrow a, it is easy to return the dust to the flue by falling to the intermediate part 20' or the sampling pipe 10 side. There are advantages.

  The first and second embodiments of the present invention have been described above, but various improvements can be adopted. For example, in the buffer space 24 of the intermediate portion 20 (20 ′), the measurement target gas blows out from the collection tube 10, the side of the abutting portion 21c, or the side of the opening of the gas introduction tube 22 ′. A coarse filter that collects dust having a relatively large particle diameter may be disposed. When the coarse filter is provided, dust contained in the measurement target gas is removed, and the measurement target gas from which the dust has been removed is allowed to flow to the collector main body 30, thereby making it difficult to deposit dust on the filter 32. .

  According to the present invention, particularly in the intermediate part 20 (20 ′), the flow path shape by the buffer space 24 of the intermediate part main body 21 and the introduction flow path 25 of the gas introduction pipe 22 (22 ′) is a trident, Specifically, the main body container is made to have a substantially T-shape or a substantially Y-shape so that the flow direction of the measurement target gas intersects rather than linearly and passes through a bag-like space in the buffer space 24 where dust accumulates. The gas to be measured containing a large amount of dust is prevented from reaching the filter 32 linearly, and the accumulation of dust on the filter 32 in the collector main body 30 is reduced. The filter 32 can be used for a long time. It is particularly suitable as a gas collector for high dust.

  Further, in the present invention, there is an abutting portion 21c where the flow of the measurement target gas strikes in the buffer space 24 of the intermediate portion 20 (20 ′), and a lot of dust accumulates at the abutting portion 21c. It is returned to the sampling pipe 10 in the flue in the natural fall or purge flow. Also in this respect, dust does not reach the filter 32, and the filter 32 can be used for a long time. Further, since a large amount of dust in the intermediate portion 20 is returned to the flue by the purge, the buffer space 24 is not filled with dust and can be used for a long time.

  Further, in the present invention, the intermediate purge port 23 is provided on the side facing the sampling tube 10, and the inside of the sampling flow path 11 of the sampling tube 10 where dust is most likely to accumulate and the buffer space 24 of the intermediate portion 20 (20 ′) are provided. Since purging is performed, dust in the collection channel 11 and the buffer space 24 is efficiently removed.

In addition, by performing a filter internal blow purge and a filter external blow purge on the filter 32,
Since dust accumulated on the outer surface of the filter 32 is scattered and removed, the occurrence of clogging of the filter 32 is further reduced. Then, preferably, the intermediate portion purge, the filter inner blow purge and the filter outer blow purge are alternately performed to remove dust at various places as a purge that stirs a purge gas with a strong gas pressure. , Improve the removal efficiency.

  In general, according to the gas sampling device of the present invention, the risk of filter clogging due to dust is remarkably reduced, and measurement is possible over a long period of time without maintenance. In addition, since the filter gas can be almost completely cleaned with the purge gas during maintenance, the life of the filter is extended and this is economical. In addition, since the measurement target gas from which dust has been removed by the filter is supplied to the gas analyzer, the gas analyzer can stably perform high-precision analysis of the component to be measured over a long period of time, and the maintenance frequency of the gas analyzer Can be kept low.

  The gas sampler of the present invention is, for example, a combustion exhaust gas containing dust that is discharged from a boiler that burns coal or the like, an environmental gas that contains dust collected around a road where there is a lot of exhaust gas from a car, and dust such as a cement plant. It is suitable for an application of collecting a measurement target gas from a gas containing a large amount of dust, such as a process gas containing a dust.

1, 2: Gas collector 10: Sampling tube 11: Sampling flow path 20, 20 ': Intermediate part 21: Intermediate part body 21a: Cylindrical body 21b: Lid part 21c: Butting part 22, 22': Gas introduction pipe 23: Intermediate part purge port 24: buffer space 25: introduction flow path 30: collector main body 31: main body container 32: filter 32a: tip part 33: collector outlet (in-filter blow purge port)
34: Filter outer blow purge port 35: Inner space 40: Measurement target gas passage valve 50: Filter inner blow purge valve 60: Filter outer blow purge valve 70: Intermediate purge valve

Claims (6)

A sampling tube formed with a sampling channel through which the gas to be measured flows;
An intermediate body that is connected to the sampling pipe and has a buffer space into which the measurement target gas flows from the sampling flow path, and an introduction flow path that is connected to the intermediate section main body and into which the measurement target gas flows from the buffer space. An intermediate portion having a gas introduction pipe formed;
A collector main body having an internal space connected to the gas introduction pipe in the intermediate portion and into which the measurement target gas flows from the introduction flow path;
A filter that is disposed in the center of the internal space of the collector main body and removes dust contained in the measurement target gas when passing from the outside to the inside;
A collector outlet for taking out the gas to be measured that has passed to the inside of the filter to the outside of the collector main body;
With
The buffer space of the intermediate body is a space extending in the same direction as the sampling flow path of the sampling pipe, and the introduction flow path of the gas introduction pipe intersects in a trifurcated manner in the middle of the buffer space. A gas collector characterized by communicating in the manner described above. The gas collector according to claim 1, wherein
The gas collector is characterized in that the shape formed by the buffer space and the introduction flow path is substantially T-shaped. The gas collector according to claim 1, wherein
The gas collector is characterized in that the shape formed by the buffer space and the introduction flow path is substantially Y-shaped. In the gas extractor according to any one of claims 1 to 3,
A gas sampling device comprising an intermediate purge port for introducing a purge gas into the buffer space so that an intermediate purge for removing dust accumulated in the buffer space and the sampling channel can be performed. The gas collector according to claim 4, wherein
An in-filter blow purge port that communicates with the inside of the filter and introduces purge gas so as to pass from the inside to the outside of the filter, and removes dust accumulated on the outer surface of the filter. A gas collector characterized by being able to alternately perform partial purging. The gas collector according to claim 4 or 5,
A filter external blow purge port that communicates with the collector main body and that introduces a purge gas so as to be blown to the outer surface of the filter, and removes dust accumulated on the outer surface of the filter, and the intermediate portion purge. A gas sampler characterized by being able to perform alternately.

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