KR101466969B1 - probe unit for gathering sample gas having hydrargyrum - Google Patents

Abstract

The present invention relates to a probe unit for sampling a sample gas containing mercury, and more particularly, to a probe unit for measuring mercury concentration in an exhaust gas discharged from an industrial site such as a thermal power plant, The present invention relates to a probe unit for sampling a sample gas containing mercury.
The probe unit for sampling a sample gas containing mercury according to the present invention comprises a sampling module inserted into the chimney for sampling a sample gas from a chimney through which exhaust gas containing mercury is discharged, A chamber installed inside the housing and connected to the sampling module, the chamber having a rear opening to which the sample gas sampled from the sampling module is introduced; And a socket formed on the rear surface of the chamber for supporting the filter unit and having a discharge port through which the sample gas passed through the filter unit is discharged.

Description

[0001] The present invention relates to a probe unit for collecting a sample gas containing mercury,

The present invention relates to a probe unit for sampling a sample gas containing mercury, and more particularly, to a probe unit for measuring mercury concentration in an exhaust gas discharged from an industrial site such as a thermal power plant, The present invention relates to a probe unit for sampling a sample gas containing mercury.

Fossil fuels such as coal contain a small amount of harmful air pollutants that are harmful to the human body, such as mercury and arsenic.

When fossil fuels are burned in high-temperature boilers, some of the heavy metals in the raw materials such as mercury, such as mercury, are discharged into the atmosphere in vapor form. Traces of toxic substances released into the atmosphere accumulate in the human body through the natural circulation process and food chain, and cause various diseases.

Mercury is released into the atmosphere and accumulates in the human body on the top layer of the food chain pyramid in the form of methyl mercury in the natural circulation process, causing damage to the nervous system through the brain, causing serious damage to the fetus and infants It is known.

Hence, mercury is defined as a pollutant globally and the emission is strictly regulated. Mercury is an internationally recognized substance that is defined as a global scale pollutant because it is excellent in long-distance mobility and material circulation occurs. It is based on UNEP (United Nations Environment Program) have.

In particular, it is estimated that about 60 to 70% of mercury emissions worldwide are emitted from combustion facilities such as coal-fired power plants. Because of this, much efforts and interest have been focused on the development of mercury removal technology from combustion facilities such as coal-fired power plants.

In order to prevent the emission of harmful substances, an analyzer which analyzes each component and concentration included in the sample gas from which a part of the exhaust gas discharged through the chimney is sampled is provided, and appropriate measures are taken according to the analysis result do.

A method for analyzing and analyzing the composition of the exhaust gas at present is a sampling measuring method in which a part of the gas discharged from the chimney is sampled and measured by a measuring device installed in a specific place through a sampling line, The in situ method for measuring is used.

Among them, the sampling method measures the gas concentration in the analyzer after the pretreatment including the process of removing moisture and dust in the sampled sample gas.

Such a pretreatment apparatus for an exhaust gas analyzer is installed between a chimney and an analyzer so as to realize an optimal gas analysis by introducing the sample gas introduced into the analyzer under the predetermined condition when analyzing the harmful exhaust gas discharged from the chimney of the industry.

When the sample gas collected through the sampling pipe installed in the inside of the chimney is introduced into the analyzer, the analyzer measures the concentration of the specific component in the sample gas.

In this case, the sample gas must be maintained in a uniform gas state in order to accurately analyze the gas. Otherwise, in the case of a wet type incinerator where the exhaust gas is cooled to below the dew point due to the temperature decrease of the exhaust gas while passing through the chimney or the moisture content of the exhaust gas is 20% or more, the steam contained in the sample gas is condensed, . Further, when the sample gas is cooled, there arises a problem that condensed water is generated in the sampling pipe and the connection pipe.

In order to solve such a problem, Korean Patent Registration No. 0890062 discloses a probe unit for sampling a sample gas and an exhaust gas telemetry system using the probe unit.

The conventional probe unit for sampling a sample gas includes first and second heaters for heating a sample gas to a predetermined temperature in the sampling unit and the filter unit to heat the sample gas at the same temperature or higher than the inside of the chimney It is configured to prevent the generation of condensed water due to cooling and to remove moisture in the sample gas so that accurate exhaust gas analysis can be performed even under wet conditions.

However, in the related art, since the exhaust gas flows directly into the sampling pipe provided in the inside of the chimney, there is a problem that the foreign substances contained in the exhaust gas are introduced together to increase the load on the filter unit.

In addition, the conventional technique has a problem that the sampling tube and the chamber which are in contact with the sample gas are made of stainless steel metal, which is not suitable for mercury measurement. That is, the mercury contained in the exhaust gas partially adheres to the inner wall of the sampling pipe and the chamber while passing through the sampling pipe and the chamber of the metal material, making it difficult to accurately measure the concentration of mercury in the actual exhaust gas and causing a corrosion problem.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problem, and it is an object of the present invention to provide an exhaust gas purifying apparatus which prevents foreign matter contained in exhaust gas from flowing into a sampling tube, reduces a load of a filter installed inside the chamber, An object of the present invention is to provide a sample unit for sampling a sample gas capable of precisely measuring the mercury concentration in the exhaust gas by preventing the attachment of mercury by insertion.

To achieve the above object, a probe unit for sampling a sample gas containing mercury according to the present invention comprises: a sampling module inserted into a chimney for sampling a sample gas from a chimney through which exhaust gas containing mercury is discharged; A holder for supporting the sampling module in a housing having a receiving space therein; A chamber installed in the housing and connected to the sampling module, the chamber having a rear opening to which the sample gas collected from the sampling module flows; A filter unit installed in the chamber to remove foreign matter from the sample gas introduced into the chamber; And a socket having a discharge port coupled to an open rear surface of the chamber for supporting the filter unit and discharging the sample gas passed through the filter unit, wherein the sampling module includes: a cartridge screwed to the holder unit; A gas sampling pipe inserted into the cartridge and having one end connected to the chamber and the other end extending into the chimney; heating means for heating the sample gas moving through the gas sampling pipe; And a gas inlet hole is formed in the exhaust gas passage so that the exhaust gas passing through the chimney can flow into the exhaust gas inlet. The gas inlet hole is formed on the opposite side of a portion of the exhaust gas, And a gas filtering tube made of a Teflon material.

Wherein the gas sampling pipe includes a first pipe connected to a rear end of the gas filtering pipe and extending to the inside of the cartridge and supported by a joint member coupled to an end of the cartridge and having a double wall, And a second pipe connected to the chamber so as to be detachable and connected to the chamber and having a double wall, the first pipe being inserted into the first outer pipe of the metal material, A first outer tube made of Teflon and screwed to a rear end of the first inner tube and having a first flow path through which the sample gas flowing through the gas filtering tube moves, And a second inner tube of Teflon, which is inserted into the outer tube and has a second flow path connecting the first flow path and the inside of the chamber, The features.

The heating means includes a bar-shaped heater installed inside the cartridge to heat the sample gas, a rod-shaped temperature sensor provided inside the cartridge for measuring the temperature inside the cartridge, and a plurality of A first support hole through which the gas sampling pipe passes, a second support hole through which the heater passes, and a temperature sensor through which the heater and the temperature sensor are passed to pass through the gas sampling pipe And a gap fixing member having a third support hole formed therein.

As described above, according to the present invention, a gas filtering pipe is installed in the gas sampling pipe to allow the exhaust gas to flow into the gas sampling pipe through the gas filtering pipe, thereby preventing the foreign substances contained in the exhaust gas from flowing into the gas sampling pipe, It is possible to greatly reduce the load of the filter member installed inside the filter member.

Provided is a probe unit capable of precisely measuring mercury concentration in an exhaust gas by preventing the attachment of mercury by inserting an inner tube of Teflon into the interior of a gas sampling tube.

Also, since the gas filtering pipe inserted into the chimney is screwed to the first pipe and the first pipe is screwed to the second pipe, it is very easy to separate and repair and exchange is easy.

FIG. 1 is a schematic view of a system for measuring exhaust gas using a probe unit according to an embodiment of the present invention,
FIG. 2 is an exploded perspective view of the probe unit applied to FIG. 1,
FIG. 3 is a cross-sectional view of the probe unit applied to FIG. 1,
4 is a cross-sectional view illustrating a probe unit according to another embodiment of the present invention.

Hereinafter, a probe unit for sampling mercury-containing sample gas according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 to 3, the probe unit 10 of the present invention is used in an exhaust gas telemetry system (TMS). For example, the present invention is installed in a chimney 3, such as a thermal power plant, through which exhaust gas containing mercury is discharged to collect a sample gas. The sampled sample gas is supplied to the analysis unit 110 of the telemetry system through the connection tube 100. The data measured by the analysis unit 110 is transmitted to the control unit 120, which is a remote central control station, through the wired / wireless network to monitor the exhaust gas discharged from the chimney 3 of the industry.

The present invention is useful for sampling a sample gas from a wet gas having a moisture content of 20% or more in the exhaust gas. Water and dust in the sample gas flowing into the analysis unit 110 during mercury analysis in the harmful exhaust gas discharged from the chimney 3 are removed so that the analysis unit 110 can realize an optimal gas analysis.

The probe unit 10 according to an embodiment of the present invention includes a sampling module 11 inserted into a chimney 3 for sampling a sample gas from a chimney 3 through which exhaust gas is discharged, A holder 70 for holding the sampling module 11 in the housing 99 formed therein and a chamber 70 connected to the sampling module 1 installed inside the housing 99, A filter unit 80 installed to remove foreign substances in the sample gas introduced into the chamber, and a socket 90 coupled to an open rear surface of the chamber 70.

The sampling module 11 comprises a cartridge 13, a gas sampling tube, a heating means, and a gas filtering tube 50.

The cartridge 13 is screwed into the holder portion 30. [ The cartridge 13 has a cylindrical shape with a space of a certain size inside and an open front and rear. On the outer peripheral surface of the opened rear side, a threaded portion 14 is formed to be screwed with the holder portion 30. A cap 15 is provided at the front end of the cartridge 21 to be screwed into the joint member 17. A part of the cap 15 can be welded and fixed while being inserted into the cartridge 13. A screw hole 16 is formed at the center of the cap 15. A threaded portion 19 formed at the rear end of the joint member 17 is engaged with the threaded hole 16.

The joint member 17 serves to support the gas sampling tube installed inside the cartridge 13 so as to be positioned at the center of the cartridge 13. [ The joint member (17) is formed with a through hole (18) passing through the front and rear. The first pipe 20 of the gas sampling pipe passes through the through hole 18.

The gas sampling tube is inserted into the cartridge 13 so that one end thereof is connected to the chamber 70 and the other end is extended into the inside of the chimney 3. The gas sampling pipe comprises a first pipe (20) and a second pipe (40).

The first pipe 20 is connected to the rear end of the gas filtering pipe 50 and extends into the cartridge 13. The first pipe is inserted into the chimney 3 through the insertion hole formed in the chimney 3. The second pipe 40 is detachably connected to the rear end of the first pipe 20 and is received in the cartridge.

The first pipe 20 and the second pipe 40 are formed in a hollow cylindrical shape. The first pipe 20 is partially installed in the cartridge 13, and the front end is located inside the chimney 3. The second pipe (40) is connected to the chamber (70) with the rear end being accommodated in the cartridge (13).

In the present invention, the walls of the first pipe (20) and the second pipe (40) have a double structure in which the outside is made of a metal material and the inside is made of a synthetic resin. This is to prevent the deformation of the mold when the inside of the cartridge 13 is heated by the heating means, which will be described later, and to prevent the attachment of mercury by forming a portion of the cartridge 13, which is in contact with the sample gas,

Specifically, the first pipe 20 includes a first outer pipe 27 made of a metal material, a first inner tube 21 inserted into the first outer pipe 27 and screwed to the rear end of the gas filtering pipe 50 ).

The first outer tube 27 is made of stainless steel of SUS316 or SUS304 and can be manufactured to have an inner diameter of 1 inch. The first inner tube 21 is made of a synthetic resin, preferably a fluorocarbon based resin, such as Teflon. Teflon is a polytetrafluoroethylene (PTFE) resin, which has excellent heat resistance, chemical inertness and non-sticking properties due to its unique molecular structure. The first inner tube 21 has a hollow structure formed by Teflon. Accordingly, a first flow path through which the sample gas flowing into the gas filtering pipe 50 moves is formed inside. A thread 23 is formed on the inner circumferential surface of the front end of the first inner tube 21 and a thread 25 is formed on the outer circumferential surface of the rear end. The first inner tube (21) is inserted into the first outer tube (27). The outer peripheral surface of the first inner tube 21 is provided so as to be in close contact with the inner peripheral surface of the first outer tube 27.

The second pipe 40 is composed of a second outer tube 45 screwed to the rear end of the first inner tube 21 and a second inner tube 41 inserted into the second outer tube 45. At the front end of the second outer tube, a thread is formed on the inner circumferential surface to engage with the first inner tube. The second appearance has the same inner diameter as the first appearance, and the materials are the same.

The second inner tube 41 has a hollow structure formed by Teflon. A threaded portion 47 is formed at the rear end of the second inner tube 41 and is screwed into a screw hole 71 formed in the front surface of the chamber 70. A second flow path is formed inside the second inner tube (41). The second flow path connects the first flow path formed in the first inner tube 21 and the chamber 70. The sample gas moving along the first flow path flows into the chamber 70 through the second flow path.

The gas filtering pipe (50) is screwed to the front end of the first inner tube (21) of the first pipe (20). The gas filtering pipe (50) is located inside the chimney (3) and contacts the exhaust gas passing through the chimney (3). The gas filtering tube 50 is preferably formed of a Teflon material. The gas filtering pipe 50 prevents foreign matter such as dust contained in the exhaust gas flowing into the first inner tube 21 of the first pipe 20 from flowing into the filter unit 80 . To this end, the gas filtering pipe 50 is formed in a cylindrical shape having a hollow structure in which the front end portion is closed and the rear end portion is opened. A threaded portion 51 is formed at the rear end side of the gas filtering pipe 50. The gas filtering pipe (50) is screwed to the front end of the first inner tube (21).

A plurality of gas inlet holes 53 are formed in the gas filtering pipe 50. Many gas inlet holes 53 are formed at regular intervals. Preferably, the gas inflow hole 53 is formed on the opposite side of the gas filtering pipe 50, that is, the side where it collides with the flow of the exhaust gas. Therefore, the gas inlet hole 53 is formed on the upper portion of the gas filtering pipe 50. Since the exhaust gas is discharged upward from the lower portion of the stack 3, the lower portion of the gas filtering pipe 50 collides with the flow of the exhaust gas. Therefore, the gas inflow hole 53 is formed in the upper portion of the gas filtering pipe 50, so that the inflow of foreign matter through the gas inflow hole 53 can be minimized.

As shown in FIG. 4, a blocking cover 57 may be installed in the gas filtering pipe 50 to minimize the inflow of foreign matter. The blocking cover 57 is formed by bending a thin rectangular plate. The blocking cover 57 has a U-shaped structure in which the lower portion forms a curved portion and the upper portion is opened. The curved surface portion of the blocking cover 57 is joined to the lower outer circumferential surface of the gas filtering pipe 50. The height of the blocking cover 57 is preferably about twice the outer diameter of the gas filtering pipe 50. Foreign matter introduced into the gas inflow hole 53 by the blocking cover 57 can be effectively suppressed.

1 to 3, the sample gas flowing into the first flow path of the first inner tube 21 through the gas inlet hole 53 of the gas filtering tube 50 moves along the second flow path And flows into the interior of the chamber 70.

The present invention includes a heating means for heating a sample gas moving through the first pipe (20) and the second pipe (40). The heating means is heated to a temperature equal to or higher than the internal temperature of the stack 3 to prevent condensation of the vapor contained in the sampled sample gas.

A rod heater 60 installed inside the cartridge 13 for heating the sample gas, a rod-shaped temperature sensor 61 provided inside the cartridge for measuring the temperature inside the cartridge 13, And a gap fixing member 63 that is installed in the cartridge 13 at a predetermined interval and holds the heater 60 and the temperature sensor 61 at predetermined intervals around the gas sampling tube.

One or more than two heaters 60 may be installed. In the illustrated example, two heaters 60 are applied. A bar heater may be applied to the heater 60. The heater (60) is composed of a hollow tube body and a heat transfer coil which is placed in the hollow tube and generates heat. The heater 60 heats the sample gas flowing into the first and second pipes 20 and 40 within a range of 120 to 250 ° C.

A typical rod-shaped sensor is used as the temperature sensor 61. For example, RTD (PT 100 ohm) or K type sensor can be used as the temperature sensor. The temperature inside the cartridge 13 is sensed by the temperature sensor 61. [

The two heaters 60 and the temperature sensor 61 are supported by the gap fixing member 63. At least two spacing members 63 are provided in the cartridge 13 at regular intervals. A first support hole 65 through which the second pipe 40 passes is formed at the center of the gap fixing member 63 and a second support hole 67 and a third support hole 65 are formed around the first support hole 65. [ (69) are formed. Two second support holes 67 are formed. And the heater 60 passes through the second support hole 67. Then, the temperature sensor 61 passes through the three support holes 69. The gap fixing member 63 allows the heater 60 and the temperature sensor 61 to be maintained at a predetermined interval around the second pipe 40.

Although not shown, the heater 60 and the temperature sensor 61 may be electrically connected to the power source and the controller. For example, a controller and a power source may be installed inside the housing 99 and connected to the heater 60 and the temperature sensor 61. In this case, the controller controls the operation of the heater 60 by the signal inputted from the temperature sensor 61. [ When the temperature sensed by the temperature sensor 61 drops below the set temperature, the controller applies power to the heater 60 to operate the heater 60 to heat the sample gas. When the temperature rises above the set temperature, Thereby stopping the operation of the heater 60.

The holder (30) serves to support the sampling module (11) on the housing (99).

The holder portion 30 includes a flange 31 and first and second fastening portions 33 and 35. A cylindrical first fastening portion 33 is formed on the front surface of the flange 31 to protrude from the cartridge 13 to be engaged with the cartridge 13. The first fastening portion 33 is threaded on the inner circumferential surface so as to be screwed to the rear end of the cartridge 13. A cylindrical second fastening portion 35 is formed on the rear surface of the flange 31 so as to protrude from the chamber 70. The second fastening portion 35 is threaded on the inner circumferential surface so as to be screwed to the projecting engaging portion 73 of the chamber 70.

The flange 31 is formed with a plurality of through holes. The front surface of the flange 31 is coupled to the inside of the front surface of the housing 99. A bolt is attached to the through hole of the flange 31 and is coupled to the housing 99.

The chamber 70 is installed in a housing space provided inside the housing 99 and engages with the second fastening part 35 of the holder part 30. [

The chamber 70 has a cylindrical cylindrical structure having a predetermined size of space therein. The front surface of the chamber 70 is formed with a projecting engaging portion 73 to be screwed with the second engaging portion 35 of the holder portion. A thread is formed on the outer circumferential surface of the projecting engagement portion 73. A screw hole 71 is provided at the center of the projecting engagement portion 73. The threaded portion 47 of the second inner tube 41 is screwed into the threaded hole 71 of the protruded engaging portion 73. The rear side of the chamber 70 has an open structure. A screw thread is formed on the opened rear side inner peripheral surface so that the socket 90 is screwed. O-rings 79 and 98 are respectively installed on the front and back sides of the chamber 70 for sealing. A Teflon coating layer is formed on the inner peripheral surface of the chamber 70 formed of stainless steel to prevent the adhesion of mercury. A port 74 for injecting a calibration gas is formed on the side surface of the chamber 61. Although not shown, the port 74 is provided with a line through which the gas is moved.

The filter unit is installed inside the chamber 70 to remove foreign matter from the sample gas flowing into the chamber 70. The filter portion comprises a filter member 83, a filter cover 81, and a coupling ring 85.

The filter member 83 and the filter cover 81 are respectively coupled to the sockets 90 and embedded in the interior of the chamber 70. The filter member 83 is formed in a conical shape whose rear surface is open, and it is preferable to use a high-performance filter capable of filtering 99.9% or more of particles of 0.3 mu m or more. For example, the filter member 83 may be made of a silica fiber material. The filter member 83 filters foreign substances in the sample gas flowing into the chamber 70 and supplies only the pure sample gas to the analyzer 110 so that accurate measurement can be performed. The filter member 83 is coupled to the socket 90 by a coupling ring 85.

The filter cover (81) has a cylindrical structure surrounding the filter member (83) and primarily prevents foreign matter from entering the filter member (83). In particular, since the filter cover 81 has a plurality of through holes formed on the outer surface thereof and the front surface thereof is closed, the sample gas is uniformly diffused to the side surface of the filter cover 81 when the sample gas is introduced, Thereby preventing the sample gas from being introduced into only a part of the gas.

The filter portion having the above structure effectively removes fine dust in the sample gas and the filter member 83 can be easily exchanged. The sample gas introduced into the chamber 70 passes through the filter cover 81 and the filter member 83 and flows out through the outlet of the socket 90. A connection tube 100 extending to the analysis unit 110 is connected to an outlet formed through the front and rear of the socket 90

The socket 90 is coupled to the open rear surface of the chamber 70 to support the filter portion. The sample gas having passed through the filter portion flows into the connection tube 100 through the discharge port. Although not shown in FIG. 3, the connection tube 100 connected to the analysis unit 110 extends into the housing 99 and is connected to the socket 90. The socket 90 is composed of four stages 91, 93, 94 and 95 whose radii gradually increase. The first end 91 having the smallest radius is fixed to the filter member 85 and the second end 93 having a radius larger than the first end is threaded on the outer circumferential surface so that the filter cover 81 is screwed And the third end 94 having a radius larger than the second end is threaded on the outer circumferential surface and the chamber 70 is screwed.

On the other hand, a band heater 7 is mounted on the outside of the chamber 70. The band heater 7 heats the entire chamber 70 uniformly and quickly. A band heater having a capacity of 300 W can be used. The band heater 7 prevents condensation of the steam contained in the sample gas introduced into the chamber 70, such as a heater installed in the sampling module. A heat insulating cover may be provided on the outer side of the band heater 7. Further, a temperature sensor (not shown) may be installed inside the chamber 70 to measure the temperature of the sample gas heated inside the chamber 70. It goes without saying that the band heater 7 and the temperature sensor can be controlled by a controller installed inside the housing 99.

An LCD output unit (not shown) for outputting and displaying the set temperature and the current temperature is provided at one side of the housing 99, and an operation unit (not shown) for setting the temperature and controlling the controller may be provided.

The sample gas can be easily collected from the exhaust gas by the probe unit 10 of the present invention described above. In addition, the first and second inner tubes of the Teflon material prevent mercury from adhering, and the concentration of mercury in the sampled sample gas can be accurately measured.

Also, the gas filtering pipe 50 and the first pipe 20 inserted into the chimney are easily exchanged. Since the first pipe 20 is supported by the joint member 17 and is screwed to the second pipe 40, the first pipe 20 is very easy to separate. Also, since the gas filtering pipe 50 is also screwed to the first pipe 20, the gas filtering pipe 50 is very easy to separate.

The sample gas sampled by the probe unit 10 of the present invention is supplied to the analysis unit 110 in a gaseous state in which moisture and foreign substances are removed. The analysis unit 110 is installed inside the rectangular box 101. The box can be equipped with an air conditioner to keep the inside of the box constant and a sample gas conditioner to cool the sample gas to a certain temperature. The analyzer 110 automatically measures the concentration of mercury in the sample gas in real time. It is needless to say that the concentration of various pollutants such as SO ₂ , NO x, HCl, HF, NH ₃ and CO can be measured in addition to mercury. The measured result data is transmitted to a data collection device (not shown). The data logger collects 5 minutes (average) data and 30 minutes (average) data by collecting the measurement signal and status signal sent from the analyzer in real time (at least once per second) And transmits data to the control unit 120 through the wireless network. The transmitted signal conforms to the RS-232C standard.

The control unit 120 provides a data collection / analysis / statistical function, a real-time monitoring function, an automatic example / alarm transmission function, a remote control / remote command function, In addition, the control unit 120 collects the measured values of the analysis items and automatically alerts the manager, each business site and the local government through telephone, mobile phone, and fax when there is a possibility of exceeding the emission limit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

3: Chimney 10: Probe unit
13: cartridge 20: first pipe
30: holder part 40: second pipe
50: gas filtering tube 60: heater
61: temperature sensor 63: gap fixing member
70: chamber 81: filter cover
83: Filter element 90: Socket

Claims (3)

delete A sampling module inserted into the chimney to collect a sample gas from a chimney through which exhaust gas containing mercury is discharged;
A holder for supporting the sampling module in a housing having a receiving space therein;
A chamber installed in the housing and connected to the sampling module, the chamber having a rear opening to which the sample gas collected from the sampling module flows;
A filter unit installed in the chamber to remove foreign matter from the sample gas introduced into the chamber;
And a socket coupled to an open rear surface of the chamber to support the filter unit and having a discharge port through which the sample gas having passed through the filter unit is discharged,
The sampling module includes a cartridge screwed to the holder, a gas sampling pipe inserted into the cartridge and having one end connected to the chamber and the other end extending into the chimney, And a gas inflow hole provided at an end of the gas sampling pipe to allow the exhaust gas passing through the chimney to flow into the inside of the chimney. In order to suppress the inflow of the foreign substances contained in the exhaust gas A gas filtering tube of teflon material having the gas inlet hole formed on the opposite side of a portion where the exhaust gas flows, and a lower portion which is opened at an upper portion and which forms a curved portion is installed to be coupled to an outer peripheral surface of a lower side of the gas filtering tube, And a blocking cover which is twice the outer diameter of the gas filtering pipe,
Wherein the gas sampling pipe includes a first pipe connected to a rear end of the gas filtering pipe and extending to the inside of the cartridge and supported by a joint member coupled to an end of the cartridge and having a double wall, And a second pipe extending in the chamber to be detachable and connected to the chamber and having a double wall,
The first pipe includes a first outer pipe of a metal material, a first flow path inserted into the first outer pipe, screwed with a rear end of the gas filtering pipe, and a first flow path through which the sample gas flows into the gas filtering pipe A first inner tube made of Teflon having a thread formed on the outer peripheral surface of the rear end thereof, a second outer tube having a screw thread formed on the inner circumferential surface of the front end and screwed into the rear end of the first inner tube, And a second inner tube of Teflon, which is threadedly coupled to the front surface of the chamber and has a second flow path connecting the first flow path and the inside of the chamber, . The apparatus according to claim 2, wherein the heating means comprises: a bar-shaped heater installed inside the cartridge to heat the sample gas; a rod-shaped temperature sensor provided inside the cartridge for measuring a temperature inside the cartridge; A plurality of first support holes through which the gas sampling pipe passes and a second support hole through which the heater is passed so that the heater and the temperature sensor can be maintained at predetermined intervals around the gas sampling pipe, And a gap fixing member formed with a third support hole through which the temperature sensor passes.

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