JP2011137765A - Sampling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sampling device, capable of continuously and accurately sampling a gaseous substance in dust-containing gas, and capable of being subjected to the continuous monitoring of the operation state of a plant through which the gas flows. <P>SOLUTION: The sampling device has a pipeline 1 through which the gas containing the gaseous substance and dust to be sampled flows and a sampling part 2 configured such that a filter, of which the opening surface is arranged along the pipeline 1 in the axial direction, faces the inside of the pipeline 1 and sucking part of the gas at a filtering speed lower than the flow speed of the gas, through the opening of the filter to sample sampling gas. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a sampling apparatus, and is particularly useful when applied to sampling of a gaseous substance contained in a high temperature, high pressure, high dust gas.

  Sampling has been performed in which a part of the gas is collected and analyzed for the purpose of analyzing gaseous substances in the gas flowing through pipes in various plants. When the gas containing the gaseous substance to be sampled contains dust, the sampling gas is collected from the gas flowing through the pipeline of the plant through the filter of the sampling unit, and then the sampling gas Gaseous substances are collected by a wet suction method in which concentration is performed by bubbling (see, for example, Patent Document 1).

  However, the filter in the conventional sampling apparatus basically has a structure that captures dust in the gas in a state orthogonal to the gas flow direction, so that the filter is clogged in a short time. As a result, it was necessary to frequently replace and clean the filter, which was an obstacle to constructing a continuous monitoring system for the plant. Furthermore, since the sampling gas is collected through a filter in which dust is trapped, the gaseous substance to be sampled adheres to and is adsorbed to the dust, resulting in a decrease in analysis accuracy. Problems are also occurring. Such a problem becomes more conspicuous when the amount of gaseous substances contained in the sampling gas is very small.

  The above-described wet suction method is a method for concentrating and collecting a gaseous substance to be sampled by circulating a sampling gas adjusted to a predetermined low pressure (usually normal pressure) through a washing bottle containing an absorbing solution. . Therefore, when the gas flowing through the pipe line of the plant is at a high pressure, it is necessary to reduce the sampling gas collected by the sampling unit to a predetermined low pressure (normal pressure) with a decompression device before performing wet suction.

  When the sampling gas is rapidly depressurized in the decompression device, the sampling gas may be deposited due to a decrease in gas temperature due to adiabatic expansion, and the sampling gas may adhere to a pipe line or the like in contact with the sampling gas. There is.

  By the way, in the coal gasification gas combined power generation (IGCC) facility, which is attracting attention as a technology that realizes high-efficiency power generation, knowing the behavior of gaseous substances in coal gasification gas can affect the environment. It is important to know the effects on the materials that make up the equipment.

  Therefore, the coal gasification gas flowing through the pipeline of the IGCC facility is sampled and the gaseous substances contained in the sampling gas are analyzed.

  However, since the coal gasification gas in such an IGCC facility is a gas of high temperature, high pressure, and high dust, when it is sampled to analyze a gaseous substance, the above-described problems are included. In other words, appropriate sampling technology for gaseous substances from high temperature, high pressure, high dust gas, especially sampling technology that can be applied to continuous monitoring is still undeveloped and is defined by JIS at the time of sampling. Although a method using exhaust gas sampling that is wet-suctioned into a cleaning bottle is used, it has the following problems.

1) When the dust is separated and removed, the filter is clogged.
2) Gaseous substances to be sampled adhere to and adsorb on the separated dust.
3) At the time of depressurization to a predetermined low pressure (for example, normal pressure), the gas temperature of the sampling gas decreases due to adiabatic expansion due to abrupt depressurization, and the gaseous substance to be sampled adheres to the pipe line or the like.
4) Because of high temperature and high pressure, quartz glass, PTFE (Teflon (registered trademark)), etc. cannot be used.

  In addition, although the above-mentioned patent document 1 exists as a prior art document disclosing a sampling device for high temperature, high pressure, and high dust gas, the problems 1) to 4) described above are the problems disclosed in this patent document. None have been solved.

JP-A-9-218141

  In view of the above prior art, the present invention can continuously and accurately sample components of gaseous substances in a gas containing dust, including high temperature, high pressure, and high dust gas. An object of the present invention is to provide a sampling device that can contribute to continuous monitoring of the operating state of a distributed plant.

  A first aspect of the present invention that achieves the above object is provided with a pipeline through which a gas containing a gaseous substance and dust to be sampled flows and an opening surface along the axial direction of the pipeline. A sampling unit that faces the inside of the pipe line and collects sampling gas by sucking a part of the gas at a filtration rate lower than the flow rate of the gas through the opening of the filter; In the sampling device.

  According to this aspect, the filter is disposed so that the opening surface is along the axial direction of the pipe line through which the gas containing dust flows, and a part of the gas is passed through the filter at a filtration rate lower than the flow rate of the gas. As a sampling gas, most of the dust flows through the pipe along with the gas. As a result, the dust does not easily adhere to the surface of the filter. Distributed. As a result, it is possible to prevent the dust from adhering to the filter as much as possible and effectively prevent the accumulation thereof.

  Thus, it is possible to analyze the gaseous substance in the sampling gas with high accuracy by preventing the gaseous substance from being mixed into the dust as much as possible.

  Further, since dust does not accumulate on the filter, continuous sampling is possible, which contributes to continuous sampling of the gaseous substance.

  According to a second aspect of the present invention, in the sampling device according to the first aspect, the sampling unit includes a cylindrical filter having the same diameter as the pipe disposed in the middle of the pipe, An outer tube is provided so as to surround the outer peripheral surface, and both ends thereof are integrated with the pipe line to form a space between the outer peripheral surface of the filter and the inner peripheral surface. In the sampling device.

  According to this aspect, since the filter and the pipe have the same diameter, the present invention can be applied favorably when the pipe has a small diameter.

  According to a third aspect of the present invention, in the sampling device according to claim 1, a part of the pipe is cut away so that the surface of the filter is flush with the inner peripheral surface of the pipe. A sampling device is provided.

  According to this aspect, since the filter is disposed by cutting out a part of the pipe, it is favorable when applied to a pipe having a large diameter.

  According to a fourth aspect of the present invention, in the sampling device according to claim 1, the filter is formed so as to be movable in the pipe line in the radial direction of the pipe line.

  According to this aspect, the position of the filter opening in the radial direction of the pipe line can be freely adjusted, so that the present invention can be applied favorably when there is a gas concentration distribution in the radial direction.

  According to a fifth aspect of the present invention, in the sampling device according to any one of the first to fourth aspects, a pressure adjusting unit that adjusts the pressure of the sampling gas collected by the sampling unit to a predetermined pressure is provided. The sampling apparatus is characterized by the above.

  According to this aspect, since the pressure of the sampling gas collected by the sampling unit can be adjusted to a predetermined pressure, it is possible to provide a sampling gas having a constant pressure even if the pressure of the gas flowing through the pipe fluctuates. Can do.

  According to a sixth aspect of the present invention, in the sampling device according to any one of the first to fifth aspects, the sampling gas collected by the sampling unit is heated so that the gaseous substance does not adhere thereto. A sampling apparatus having a pressure reducing means for reducing the pressure to a predetermined pressure.

  According to this aspect, since the pressure of the sampling gas can be reduced, when the sampling gas immediately after collection is high pressure due to the high pressure of the gas flowing through the pipeline, the sampling gas is set to a predetermined value. It is useful when applied to the collection of gaseous substances by reducing the pressure to a normal pressure (for example, normal pressure). By appropriately adjusting the temperature drop of the sampling gas by heating at this time, it is possible to prevent the adherence to the pipeline of the sampling system due to aggregation of gaseous substances and the like, thereby contributing to high-precision analysis. Because.

  According to a seventh aspect of the present invention, in the sampling device according to the sixth aspect, the decompression unit of the decompression unit is configured by spirally winding a decompression line into which the sampling gas is introduced. In the sampling device.

  According to this aspect, since the decompression part is formed by spirally winding the decompression pipe into which the sampling gas is introduced, the sampling gas can be gradually decompressed so that the gaseous substance does not adhere. In addition, the required decompression line length can be easily ensured without increasing the size of the decompression means.

  According to an eighth aspect of the present invention, in the sampling device according to the seventh aspect, the backwashing steam is supplied to the sampling unit or the decompression unit via a three-way valve provided between the sampling unit and the decompression unit. There is provided a sampling apparatus characterized by having a steam supply means for selectively supplying to the apparatus.

  According to this aspect, since the steam for backwashing can be selectively supplied to the sampling unit or the decompression unit via the three-way valve, the sampling unit or the decompression unit can be cleaned independently. In particular, the present invention is useful when applied to an IGCC facility provided with a steam supply facility.

  According to a ninth aspect of the present invention, there is provided the sampling apparatus according to any one of the first to eighth aspects, wherein at least a portion in contact with the sampling gas is formed of sulfinate. .

  According to this aspect, since the portion in contact with the sampling gas is formed of sulfinate, it is possible to prevent the gaseous substance in the sampling gas from adhering to the sampling system pipe or the like even if the sampling gas is at a high temperature and high pressure. This is a particularly remarkable effect when the amount of the gaseous substance is very small.

  According to the present invention, the opening surface of the filter is disposed so as to be along the axial direction of the pipeline through which the gas containing the gaseous substance and dust flows, and is smaller than the flow velocity of the gas through the opening of the filter. Since a part of the gas is sucked and collected as a sampling gas at the filtration speed, dust does not easily adhere to the surface of the filter, and even if it adheres, the filtration speed is low. Dust adhering to the filter is blown away, and as a result, dust accumulation on the filter surface can be avoided.

  As a result, not only can the gaseous substance in the sampling gas be trapped in the dust, but an accurate analysis of the gaseous substance can be performed, as well as the sampling gas can be continuously collected, It can contribute to continuous monitoring of equipment to be monitored, such as IGCC.

It is a block diagram which shows the sampling apparatus which concerns on embodiment of this invention. FIG. 2 is a diagram illustrating a first example of a specific configuration of a sampling unit in the sampling device illustrated in FIG. 1, where (a) is a longitudinal sectional view, (b) is a view taken along line AA ′, and (c). Is a view taken along line BB ′. 2A and 2B are diagrams showing a second embodiment showing a specific configuration of the sampling unit in the sampling device shown in FIG. 1, in which FIG. 1A is a longitudinal sectional view, FIG. Is a DD ′ line view. FIG. 8 is a diagram illustrating a third embodiment of a specific configuration of the sampling unit in the sampling device illustrated in FIG. 1, in which (a) is a longitudinal sectional view, (b) is a view taken along line EE ′, and (c). Is a view taken along line FF ′. FIG. 8 is a diagram illustrating a fourth embodiment of a specific configuration of the sampling unit in the sampling device illustrated in FIG. 1, where (a) is a longitudinal sectional view, (b) is a view taken along line GG ′, and (c). Is a view on arrow HH ′. It is explanatory drawing which shows the other structure of the decompression device in a sampling device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a sampling apparatus according to an embodiment of the present invention. Although this form is demonstrated as a sampling device of the gaseous substance applied to the IGCC installation, of course, it is not limited to this. It can be generally applied as an apparatus for sampling a gaseous substance from a gas containing dust. Here, the gaseous substance includes gaseous trace substances such as mercury as well as nitrogen oxides and sulfur oxides contained in the gas. Further, it is not necessary to limit the application target to high temperature, high pressure, and high dust gas. However, when applied to the sampling of gaseous substances from high temperature, high pressure, and high dust gas, particularly remarkable actions and effects can be achieved. Incidentally, the gas flowing through the pipeline in the IGCC facility is a high temperature (for example, 200 ° C.), high pressure (for example, 2.0 MPa), and high dust gas. Therefore, in the case of this embodiment, a high-pressure (for example, 2.0 MPa) sampling gas is reduced to normal pressure (0.1 MPa) to concentrate and collect gaseous substances.

  As shown in FIG. 1, the sampling device includes a pipe 1 that is a mother pipe through which coal gasification gas flows in an IGCC facility, a sampling unit 2 disposed in the pipe 1, a decompression device 3, and gaseous substance absorption. Part 4. Among these, the sampling unit 2 has a filter (not shown in FIG. 1; the same applies hereinafter) disposed so that the opening surface extends along the axial direction of the pipe 1, which will be described in detail later. In addition, a part of the gas is sucked as a sampling gas through the filter at a filtration rate smaller than the gas flow rate. The decompression device 3 introduces the sampling gas collected by the sampling unit 2 and decompresses it to a predetermined pressure (usually normal pressure). In this embodiment, the decompression line 3a into which the sampling gas is introduced is spirally formed. It is wound and configured. Thus, it is not essential to form the decompression device 3 with the spiral decompression line 3a. However, the required decompression line length can be easily secured without incurring an increase in the size of the decompression device 3 by using the spiral decompression line 3a.

  The decompression device 3 is covered with a sampling pipe 7 from the sampling unit 2 to the decompression device 3 and a sampling pipeline 8 from the decompression device 3 to the gaseous substance absorption unit 4, and the outer periphery thereof is covered with a container 6. Gaseous substances contained in the sampling gas are heated so as not to adhere to the inner peripheral surfaces of the decompression pipe 3a and the sampling pipes 7 and 8 by adiabatic expansion. More specifically, the space between the container 6 and the decompression pipe 3a and the sampling pipes 7 and 8 is supplied with steam at a predetermined temperature from the steam supply section 9 through the steam supply pipe 15 and the inlet side opening / closing valve 16. Is supplied and charged. On the other hand, steam or the like whose temperature has decreased is discharged to the outside through the steam discharge pipe 17 and the outlet-side opening / closing valve 18, and the space is always maintained at a constant temperature by supplying new steam. It has become.

  Here, the inner peripheral surface of the sampling system pipe line with which the sampling gas comes into contact, that is, the inner peripheral surfaces of the sampling pipe lines 7 and 8 and the decompression pipe line 3a are processed with Sulfinate (registered trademark). This prevents gaseous substances from adhering to the inner peripheral surfaces of the sampling pipes 7 and 8 and the decompression pipe 3a.

  The gaseous substance absorption part 4 extracts and collects a gaseous substance from sampling gas, and is comprised as a wet absorption part in this form. That is, although illustration is omitted, the gaseous substance is concentrated and collected in the absorbing liquid by circulating the sampling gas through a glass gas cleaning bottle containing the absorbing liquid of the gaseous substance.

  The pressure adjusting valve 5 is disposed between the sampling unit 2 and the decompression device 3 in the sampling line 7 and is adjusted so that the pressure of the sampling gas flowing into the decompression device 3 is constant (for example, 1.5 MPa). is doing. That is, the pressure of the coal gasification gas flowing through the pipe line 1 varies depending on the operating state and the like. Even if the pressure of the coal gasification gas varies in this way, the pressure of the sampling gas flowing into the decompression device 3 is kept constant. Adjust. Such a pressure regulating valve 5 is not necessarily required, but when the pressure regulating valve 5 is provided, stable sampling can be performed in equipment in which the pressure of the gas flowing through the mother pipe fluctuates.

  The steam supply unit 9 supplies steam to the sampling unit 2 or the decompression device 3 via the three-way valve 10 disposed between the pressure regulating valve 5 and the decompression device 3 in the sampling pipe line 7 to obtain the sampling unit 2. The filter or the pressure reducing line 3a of the pressure reducing device 3 is also cleaned.

  Thus, although steam was used as a cleaning agent in this embodiment, the present invention is not limited to this. For example, it may be cleaned with nitrogen gas or the like. However, some equipment has a steam source. In this case, it is reasonable to use steam. Incidentally, in the case of an IGCC facility, steam can be easily obtained from, for example, a steam turbine.

  The bypass line 11 distributes excess sampling gas out of the sampling gas discharged from the sampling line 8 of the decompression device 3 by bypassing the gaseous substance absorbing unit 4. That is, since the amount of sampling gas supplied to the gaseous substance absorbing unit 4 is a predetermined small amount, the surplus is diverted through the bypass line 11. Here, a bypass valve 12 is disposed in the middle of the bypass conduit 11, and the sampling gas is bypassed by opening the bypass valve 12 (usually in an open state). The other bypass line 13 is for bypassing the sampling gas so as to avoid the inflow of the sampling gas into the gaseous substance absorber 4 when the outlet pressure of the decompression device 3 exceeds a predetermined value for some reason. Therefore, a safety valve 14 is disposed in the middle of the bypass line 13, and the sampling gas bypasses the gaseous substance absorbing unit 4 by opening the safety valve 14. The sampling gas that has bypassed the gaseous substance absorbing section 4 by the bypass pipes 11 and 13 is merged with the coal gasification gas flowing through the pipe 1 on the downstream side.

  According to this embodiment, the filter is disposed so that the opening surface is along the axial direction of the pipe line 1 through which the high-temperature, high-pressure, high-dust coal gasification gas flows, and the filtration speed is lower than the flow rate of the gas. Since a part of the gas is sucked as a sampling gas through the filter, most of the dust flows through the pipeline 1 together with the gas. As a result, the dust hardly adheres to the surface of the filter. The gas is separated from the filter by the gas flow and is distributed along with the gas. As a result, it is possible to prevent the dust from adhering to the filter as much as possible and effectively prevent the accumulation thereof.

  Thus, it is possible to analyze gaseous substances with high accuracy by preventing the adsorption of gaseous substances to dust as much as possible, and at the same time, continuous sampling is possible and the gaseous substances can be sampled continuously. Become.

  The gaseous substance absorbing unit 4 may be connected to a measuring means for measuring the amount of the collected gaseous substance. By integrating with the measuring means in this way, continuous monitoring of a predetermined gaseous substance can be easily realized.

  Next, the detailed structure of the sampling unit 2 will be described with reference to FIGS. 2 to 5 as first to fourth embodiments.

<First embodiment>
2A and 2B are diagrams showing an extracted filter portion of the sampling unit according to the first embodiment, in which FIG. 2A is a longitudinal sectional view, FIG. 2B is a view taken along line AA ′, and FIG. It is a B 'line arrow directional view. As shown in these drawings, the filter 20 of the sampling unit 2 according to the present embodiment is disposed so that the opening surface thereof is parallel to the axial direction of the pipe line 1, and the surface thereof is the inside of the pipe line 1. A part of the pipe line 1 is cut out so as to be flush with the peripheral surface. More specifically, the filter 20 in this embodiment is fitted in a hole in which a part of the pipe line 1 is cut out so that the opening surface is parallel to the axial direction of the pipe line 1. The outer peripheral side is covered with a cover 21 fixed to the pipe line 1. As a result, a space is formed between the outer surface of the filter 20 and the inner peripheral surface of the cover 21, and one end portion of the sampling pipe line 7 is opened in this space. Here, the portions where the sampling gas contacts, such as the inner peripheral surfaces of the filter 20 and the cover 21, are subjected to the same sulfinate processing as the inner peripheral surface of the sampling pipe line 7, and adhesion of gaseous substances is possible. It has a structure that can be prevented.

  In the sampling unit 2 having such a filter 20, the gas flowing through the pipe line 1 is sucked through the filter 20 in a direction orthogonal to the axial direction of the pipe line 1. As a result, part of the gas filtered by the filter 20 flows into the sampling pipe line 7 through the space between the cover 21 and the sampling gas. At this time, the dust 19 contained in the gas is deposited on the surface of the filter 20 by making the filtration speed of the sampling gas through the filter 20 sufficiently lower than the flow velocity of the gas flowing through the pipe line 1. It can be prevented as much as possible. When the filtration rate is sufficiently small with respect to the gas flow rate, most of the dust 19 flows along with the gas in a state where it floats in the gas, and even if it adheres to the surface of the filter 20, the sampling pipeline 7 side Since the flow rate of the sampling gas toward (lower side in FIG. 2 (a)) is small, the dust 19 exposed to the gas flow flowing through the pipe line 1 on the filter 20 is peeled off from the filter 20 and becomes a gas flow. It is because it is rejected by riding.

  The filtration speed through the filter 20 at this time is such that, in the sampling device in which the decompression device 3 is formed by the decompression conduit 3a as in the above embodiment (see FIG. 1; the same applies hereinafter), the inlet side of the decompression conduit 3a It is uniquely determined according to the difference between the pressure and the pressure on the outlet side and the pipe length of the pressure reducing pipe 3a. Therefore, when the difference between the pressure on the inlet side and the pressure on the outlet side is specified, the helical pipe length of the pressure reducing pipe 3a may be determined so as to be a pressure difference according to the filtration speed. .

  In the case of the above embodiment shown in FIG. 1 in which the pressure on the inlet side is 1.5 MPa, for example, and the pressure on the outlet side is 0.1 MPa, for example, the difference between the two is 1.4 MPa. The pipe length corresponding to the desired sampling gas amount may be selected from the relationship of the sampling gas amount at the outlet of the decompression pipe line 3a. Incidentally, in the case of the above embodiment, the sampling gas filtration rate is set to 0.01 m / sec while the gas flow rate in the pipe line 1 is 10 m / sec. That is, although the filtration rate with respect to the gas flow rate is 1/1000, it is of course not limited to this relationship. From the viewpoint of preventing dust 19 from accumulating on the filter 20, the lower the filtration rate relative to the gas flow rate, the better. However, the smaller the filtration rate, the larger the filter 20 and the larger the sampling system for collecting gaseous substances. To do. Therefore, an appropriate filtration rate is set in consideration of both.

  Even in such a structure, when sampling is performed for a long time, the dust 19 may be thinly attached on the filter 20. In this case, the filter 20 may be backwashed. Incidentally, in the case of the said embodiment, the backwashing can be performed favorably by injecting steam into the filter 20 from the steam supply part 9 via the three-way valve 10.

  In addition, regarding the filter 20, the relationship between the opening surface of the filter 20 along the axial direction of the pipe line 1 and the flow rate of the gas flowing through the pipe line 1 and the filtration speed will be described below. The same applies to the second to fourth embodiments.

  Furthermore, according to the present embodiment, since the filter 20 is provided by cutting out a part of the pipe 1, it can be applied favorably when the pipe 1 has a large diameter.

<Second embodiment>
FIGS. 3A and 3B are diagrams showing an extracted filter portion of the sampling unit according to the second embodiment, in which FIG. 3A is a longitudinal sectional view, FIG. 3B is a CC ′ line view, and FIG. It is a D 'line arrow directional view. As shown in these drawings, the filter 30 is disposed in the pipe line 1 so that the opening surface thereof is flush with the inner peripheral surface of the pipe line 1. It is installed using a gas sampling part 32 that is provided integrally with the path 1. That is, a container-like cover 31 is attached to the end of the sampling pipe line 7 penetrating the sampling part 32, a filter 30 is attached so as to close the opening of the cover 31, and the surface faces the inside of the pipe line 1. is there.

  In the present embodiment, the same operation and effect as in the first embodiment can be obtained, and it can be applied well when the pipe line 1 has a large diameter.

<Third embodiment>
4A and 4B are diagrams showing an extracted filter portion of the sampling unit according to the third embodiment, in which FIG. 4A is a longitudinal sectional view, FIG. 4B is a view taken along line EE ′, and FIG. It is a F 'line arrow directional view. As shown in these figures, the filter 40 is a cylindrical member having the same diameter as the pipe 1 and is disposed in the middle of the pipe 1 so that the opening surface thereof is parallel to the axial direction of the pipe 1. Yes. As a result, the opening surface of the filter 40 is flush with the inner peripheral surface of the pipe line 1. The outer peripheral surface of the filter 40 is surrounded by an outer tube 41, and this portion has a double tube structure. One end of the sampling line 7 for introducing the sampling gas through the filter 40 is open to a space between the inner peripheral surface of the outer tube 41 and the outer peripheral surface of the filter 40, and the sampling gas filtered by the filter 40 It introduces through the said space.

  In this embodiment, the basic action and fruit are the same as in the first embodiment. However, in the case of a present Example, it can apply favorably when the pipe line 1 is small diameter.

<Fourth embodiment>
5A and 5B are diagrams showing an extracted filter portion of the sampling unit according to the fourth embodiment, in which FIG. 5A is a longitudinal sectional view, FIG. 5B is a view taken along line GG ′, and FIG. It is a H 'line arrow directional view. As shown in these drawings, in this embodiment, the filter 50 is installed by using the gas sampling section 32 disposed in the middle of the pipe 1 as in the second embodiment shown in FIG. It is. That is, a container-like cover 51 is attached to the end of the sampling pipe line 7 that penetrates the sampling part 32, a filter 50 is attached so as to close the opening of the cover 51, and the opening surface faces the inside of the pipe line 1. It is. As a result, like the other embodiments, the filter 50 is disposed so that its opening surface is along the axial direction of the pipe 1 and faces the inside of the pipe 1. The pipe line 7 is configured to be movable in the radial direction of the pipe line 1. Therefore, the position of the filter 50 in the radial direction of the pipe line 1 can be adjusted by moving the opening surface of the filter 50 along the radial direction of the pipe line 1 together with the cover 51.

  As a result, this embodiment is particularly useful when there is a gas density distribution in the radial direction of the pipe 1. This is because the filter 50 can be occupied at an optimal position.

  In each of the above-described embodiments, the opening surfaces of the filters 20, 30, 40, and 50 are configured to be parallel to the axial direction of the pipe line 1. However, this is not necessarily exactly parallel and is slightly inclined. However, if it is disposed in such a manner as to extend along the axial direction, the accumulation of dust 19 on the surface of the filter 20 and the like can be satisfactorily prevented.

  In the present invention, the decompression device 3 is not essential. When the gas flowing through the pipe line 1 is low pressure and the sampling gas collected by the sampling unit 2 is not more than a predetermined pressure (for example, normal pressure), it may not be necessary to provide the decompression device 3. In this case, the sampling gas is directly sucked through the sampling unit 2 by a pump or the like disposed in the sampling pipe line 7. The filtration speed at this time may be adjusted by the suction force of the pump or the like. If the relationship between the flow rate of the gas flowing through the pipe 1 and the filtration speed is set as in the above-described embodiment, the dust 19 on the surface of the filter 20 etc. Can be prevented well.

  Furthermore, in the above-described embodiment, steam is used as the heating means in the decompression device 3, but this is not a limitation. For example, as shown in FIG. 6, a heater 60 may be disposed on the outer periphery of the pressure reducing line 3a in a space between the container 6 and the pressure reducing line 3a, and the heater 60 may be used as a heating means.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used in the industrial field in which gaseous substances are sampled from high temperature, high pressure, high dust gas.

DESCRIPTION OF SYMBOLS 1 Pipe line 2 Sampling part 3 Pressure reducing device 3a Pressure reducing line 4 Gaseous substance absorption part 5 Pressure regulating valve 9 Steam supply part 10 Three-way valve
19 Dust 20, 30, 40, 50 Filter

Claims (9)

A pipeline through which gas containing gaseous matter and dust to be sampled flows;
A filter arranged so that the opening surface is along the axial direction of the pipe line faces the inside of the pipe line, and a part of the gas is passed through the opening of the filter at a filtration rate smaller than the flow rate of the gas. A sampling device comprising: a sampling unit for collecting sampling gas by suction. The sampling device according to claim 1, wherein
The sampling unit is disposed so as to surround a cylindrical filter having the same diameter as the conduit disposed in the middle of the conduit, and an outer peripheral surface of the filter, and both ends thereof are integrated with the conduit. A sampling apparatus comprising: an outer tube that forms a space between an outer peripheral surface of the filter and an inner peripheral surface thereof. The sampling device according to claim 1, wherein
The sampling apparatus according to claim 1, wherein the filter is disposed by cutting out a part of the pipe line so that a surface thereof is flush with an inner peripheral surface of the pipe line. The sampling device according to claim 1, wherein
The sampling device according to claim 1, wherein the filter is formed to be movable in the pipe line in the radial direction of the pipe line. The sampling device according to any one of claims 1 to 4,
A sampling apparatus comprising pressure adjusting means for adjusting a pressure of a sampling gas collected by the sampling unit to a predetermined pressure. The sampling device according to any one of claims 1 to 5,
A sampling apparatus comprising: a decompression unit that decompresses a sampling gas collected by the sampling unit to a predetermined pressure while heating the sampling gas so that the gaseous substance does not adhere thereto. The sampling device according to claim 6,
The sampling device according to claim 1, wherein the decompression unit of the decompression means is configured by spirally winding a decompression line into which the sampling gas is introduced. The sampling device according to claim 7,
A sampling apparatus comprising steam supply means for selectively supplying backwashing steam to the sampling section or the decompression section via a three-way valve provided between the sampling section and the decompression section. The sampling device according to any one of claims 1 to 8,
A sampling apparatus characterized in that at least a portion in contact with the sampling gas is sulfinate processed.