JP2000097820A - Air-cooled type cooled probe for exhaust gas sampling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-cooled type cooled probe for exhaust gas sampling, excellent in handling property, operatability and cooling performance by using air as a cooling medium. SOLUTION: This probe is composed of a sampling probe 3 for sampling exhaust gas G, and an air-cooled probe body 4 fitted on the outside of a straight tube part 3a of the sampling probe 3, for cooling the sampling probe 3 by cooling air A. The air-cooled probe body 4 is equipped with an inner tube 4b for covering the straight tube part 3a of the sampling probe 3 and for forming a cooling passage 4a, where the cooling air A is passed, between it and the straight tube part 3a, an outer tube 4d arranged around the inner tube 4b, for forming a cooling jacket 4c between it and the inner tube 4b, a communicating opening 4f formed on the inner tube 4b, for communicating the cooling passage 4a to the cooling jacket 4c, and a cooling air outlet 4g for communicating to the cooling jacket 4c, and is composed so that the cooling air A will be passed through the cooling passage 4a, the communicating opening 4f and the cooling jacket 4c sequentially, and discharged from the cooling air outlet 4g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent a temperature rise of a sampling probe by cooling a sampling probe for sampling a part of exhaust gas discharged from a refuse incinerator, a gas turbine, a boiler, etc. by cooling air. The present invention relates to an air-cooled cooling probe for sampling exhaust gas, which cools sampled exhaust gas.

[0002]

2. Description of the Related Art Generally, exhaust gas discharged from refuse incinerators and the like contains harmful substances such as HCl, SOx, NOx, heavy metals and dioxins, and these harmful substances are released to the atmosphere. If this occurs, it may cause air pollution.

[0003] Therefore, in a refuse incinerator or the like, it is necessary to minimize the amount of harmful substances in exhaust gas to prevent environmental pollution and pollution. Therefore, measures have been taken to control generation of harmful substances by controlling combustion conditions and the like under predetermined conditions, and to remove harmful substances contained in exhaust gas by an exhaust gas treatment device. In the case of refuse incinerators, the amount of harmful substances discharged into the atmosphere is regulated by laws and regulations. Is constantly measured and monitored.

[0004] The exhaust gas collecting apparatus comprises a sampling probe, a filter, a conduit, a liquid collecting section, a solid adsorbing section, a sampling suction pump, a gas analyzer, and the like.
The sampling probe inserted into the exhaust gas duct is connected to a gas analyzer or the like by a filter, a conduit, a liquid collecting unit, a solid adsorption unit, a sampling suction pump, or the like.

During the operation of a refuse incinerator or the like, a part of the exhaust gas in the exhaust gas duct is sampled by a sampling probe and introduced into a gas analyzer or the like by a conduit and a sampling suction pump. Analysis and measurement of harmful substances contained in sampling gas are performed by analyzers and the like.

If the temperature of the exhaust gas flowing in the exhaust gas duct is 500 ° C. or higher, the sampling probe inserted into the exhaust gas duct and various devices (filters, gas analyzers, etc.) connected thereto may be damaged. Or
A water-cooled cooling probe is used to reduce measurement accuracy.

Conventionally, as this type of water-cooled cooling probe 20, a double-tube water-cooled jacket structure as shown in FIGS. 6 and 7 is known. That is, the water-cooled cooling probe 20 is inserted into the exhaust gas duct 21, and a sampling probe 22 that samples a part of the exhaust gas G in the exhaust gas duct 21 and a straight pipe portion 22 a of the sampling probe 22 that is inserted into the exhaust gas duct 21. And a water-cooled probe main body 23 that is fitted to the outside and cools the sampling probe 22 with the cooling water W.

The water-cooled probe main body 23 includes an inner cylinder 23a that covers the straight pipe portion 22a of the sampling probe 22,
An outer cylinder 23c disposed around the inner cylinder 23a to form a cooling jacket 23b with the inner cylinder 23a;
a and the inner and outer cylinders 23a,
A side plate 23d for closing the space between 23c and the cooling jacket 2
3b, the cooling jacket 23b is divided into an inner cooling jacket 23b 'and an outer cooling jacket 23b ".
Partition wall 23e and inner cooling jacket 23
b ', and a cooling water outlet 23g communicating with the outer cooling jacket 23b ". Further, between the sampling probe 22 and the inner cylinder 23a of the water cooling probe main body 23. , Exhaust gas duct 21
A heat-resistant sealing member 24 for preventing the exhaust gas G inside from leaking out of the duct is interposed.

The cooling water W that has flowed into the inner cooling jacket 23b 'from the cooling water inlet 23f by the water pump (not shown) and the cooling water hose 25 is sampled through the inner cooling jacket 23b'. After flowing along the longitudinal direction of the outer cooling jacket 22
b ", flows in the outer water cooling jacket 23b" along the longitudinal direction of the sampling probe 22, and is then discharged from the cooling water outlet 23g. Therefore, the sampling probe 22 and a part of the sampled exhaust gas G are heat-exchanged by the cooling water W flowing in the cooling jacket 23b (the inner cooling jacket 23b ′ and the outer cooling jacket 23b ″) of the water-cooled probe body 23. It will be cooled.

[0010]

The above-mentioned water-cooled cooling probe 20 is a cooling medium (a heat exchange medium).
The use of water has caused various problems. That is, when the water-cooled cooling probe 20 is used, it is necessary to secure the cooling water W at the measurement site. If the amount of the cooling water W is insufficient, a sufficient cooling effect cannot be obtained, and the volume of the cooling water W suddenly expands due to the insufficient amount of the cooling water W, so that the water-cooled probe main body 23 is damaged. There was a fear. In addition, a destination of the cooling water W after the heat exchange must be considered, and a water source and a hose to a draining place of the cooling water W must be prepared. Furthermore, since the water-cooled cooling probe 20 has a shape in which an air layer is formed between the sampling probe 22 and the inner cylinder 23a, the air actually comes into contact with the sampling probe 22. . This air is the sampling probe 2
2 and the inner cylinder 23a. As a result, even if the cooling water W is used as the cooling medium, there is a problem that the cooling effect is not sufficiently obtained and the cooling performance is inferior.
In addition, when the water-cooled cooling probe 20 is used for a long time, there is a problem that impurities contained in the cooling water W adhere to the inside of the probe and cause blockage. in this way,
The conventional water-cooled cooling probe 20 has a number of problems, such as poor handling, operability, and cooling performance.

The present invention has been made in view of the above problems, and an object of the present invention is to use an air as a cooling medium to obtain an exhaust gas sampling system which is excellent in handling, operability and cooling performance. An object of the present invention is to provide an air-cooled cooling probe.

[0012]

In order to achieve the above object, an air-cooled cooling probe for exhaust gas sampling according to claim 1 of the present invention is inserted into an exhaust gas duct to sample a part of the exhaust gas in the exhaust gas duct. A sampling probe and an air-cooled probe body inserted into the exhaust gas duct, fitted externally to the straight pipe portion of the sampling probe, and cooling the sampling probe with cooling air, the air-cooled probe body includes a straight pipe portion of the sampling probe. An inner cylinder that forms a cooling passage through which the cooling air flows between the covering and the straight pipe portion; an outer cylinder that is disposed around the inner cylinder and forms a cooling jacket between the inner cylinder and the inner cylinder; A cooling air passage communicating with the cooling jacket and a cooling air outlet communicating with the cooling jacket. There is characterized in that it has to be discharged cooling passage sequentially through the communication port and the cooling jacket from the cooling air outlet.

According to a second aspect of the present invention, there is provided an air-cooling type cooling probe for exhaust gas sampling, wherein a communication port is formed at a tip end side of an inner cylinder located in the exhaust gas duct, and an outer cylinder located outside the exhaust gas duct is provided. A cooling air outlet is formed on the base end side, and one end of the cooling passage is opened to the atmosphere, and the other end of the cooling passage is closed with a heat-resistant sealing material. It is characterized in that air is sucked into the cooling passage from one end of the cooling passage as cooling air by a cooling suction pump connected via a suction hose.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram showing dioxin sampling in an exhaust gas sampling apparatus using an air-cooled cooling probe for exhaust gas sampling according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes air-cooled cooling for exhaust gas sampling. Probe 2, exhaust gas duct 3, sampling probe 4, air-cooled probe body 5, suction hose 5,
6 is a cooling suction pump, 7 is a filter for collecting dust in the exhaust gas G, 8 is a conduit, 9 is a dioxin sampling device (absorption bottle 9) for collecting dioxins in the exhaust gas G.
a, comprising an adsorption column 9b and an ice-cooling bath 9c), 10
Is a suction pump for sampling, and 11 is a gas meter.

In the exhaust gas collecting apparatus shown in FIG. 1, dioxins are collected. Instead of the dioxin collecting apparatus 9 as shown in FIG. HCl / SOx or the like in the exhaust gas G may be collected by using an HCl / SOx or the like sampling device 9 '(consisting of an absorption bottle 9a' and an ice-cooling bath 9c 'or the like) for collecting the gas. Further, as shown in FIG. 3, instead of the dioxin collecting device 9, a water removing device 9 "(comprising a drain trap 9a" and an electronic cooler 9c ") for removing water in the exhaust gas G, and a gas meter 11 are provided.
Instead, the continuous analyzers 11 "that can measure oxygen, carbon monoxide, and the like in the exhaust gas G may be used to measure and analyze oxygen, carbon monoxide, and the like in the exhaust gas G.

As shown in FIGS. 4 and 5, the air-cooled cooling probe 1 for sampling exhaust gas includes a sampling probe 3 inserted into an exhaust gas duct 2 and an exhaust gas duct 2.
And an air-cooled probe main body 4 which is fitted to the straight pipe portion 3a of the sampling probe 3 and cools the sampling probe 3 by cooling air A.

That is, the sampling probe 3 is for sampling a part of the exhaust gas G discharged from a refuse incinerator (not shown) such as municipal refuse.
The exhaust gas G is inserted into the exhaust gas duct 2 through which the exhaust gas G flows, as shown in FIG.
And it is connected to the gas meter 11 by the sampling suction pump 10 and the like.

During the operation of the refuse incinerator, a part of the exhaust gas G in the exhaust gas duct 2
Is introduced into the gas meter 11 through the filter 7, the conduit 8, the dioxin sampling device 9, the sampling suction pump 10, and the like.

The sampling probe 3 is made of transparent quartz when the temperature of the exhaust gas G flowing in the exhaust gas duct 2 is 500 ° C. or higher. The sampling probe 3 has smooth inner and outer surfaces.
There is no sudden change or bending of the cross section, so that the flow of the exhaust gas G inside and outside the sampling probe 3 is not disturbed.

On the other hand, as shown in FIGS. 4 and 5, the air-cooled probe body 4 has an annular cooling shape that covers the straight pipe portion 3a of the sampling probe 3 and through which cooling air A flows between the straight probe portion 3a. An inner cylinder 4b forming a passage 4a, and an outer cylinder 4d which is hermetically inserted into the exhaust gas duct 2 and is disposed around the inner cylinder 4b to form an annular cooling jacket 4c with the inner cylinder 4b. A side plate 4e provided at both ends of the inner cylinder 4b and the outer cylinder 4d to close between the inner and outer cylinders 4b and 4d, and a communication port 4f formed in the inner cylinder 4b and communicating the cooling passage 4a and the cooling jacket 4c. And a cooling air outlet 4g formed in the outer cylinder 4d. One end (right end in FIG. 4) of the cooling passage 4a is open to the atmosphere, and the other end (left end in FIG. 4) of the cooling passage 4a is connected to the inner cylinder 4b and the sampling probe. 3 and hermetically closed by a heat-resistant sealing material 12 interposed between them. Further, the communication port 4f is provided at the tip (the left end in FIG. 4) of the inner cylinder 4b located in the exhaust gas duct 2.
The cooling air outlets 4g are formed at the base end (the right end in FIG. 4) of the outer cylinder 4d located outside the exhaust gas duct 2.

The cooling air outlet 4g of the air-cooled probe main body 4 is connected to a cooling suction pump 6 via a suction hose 5, and the air-cooled probe main body 4 is operated by operating the cooling suction pump 6. The air A (atmosphere) surrounding the air 4 is sucked into the cooling passage 4a as cooling air A from one end of the cooling passage 4a. Also, the cooling air A sucked into the cooling passage 4a.
The communication port 4f and the cooling air outlet 4g are the inner and outer cylinders 4b,
Along with being provided at both ends of 4d,
Cooling passage 4a, communication port 4f, and cooling jacket 4c
, And heat exchange with the exhaust gas G during that time, and the exhaust gas G is discharged from the cooling air outlet 4g. Furthermore,
The cooling air A after the heat exchange discharged from the cooling air outlet 4g is discharged to the atmosphere via the suction hose 5 and the cooling suction pump 6.

The inner tube 4b, the outer tube 4d and the side plate 4e of the air-cooled probe body 4 are, of course, formed of metal members having excellent heat resistance and corrosion resistance. The length and volume of the cooling passage 4a and the cooling jacket 4c, the amount of the cooling air A sucked into the cooling passage 4a, and the like are set so that the sampling probe 3 and the sampled exhaust gas G can be cooled to a predetermined temperature. Needless to say, each is selected.

In the exhaust gas sampling apparatus shown in FIG. 1, a part of the exhaust gas G flowing through the exhaust gas duct 2 is sampled by the sampling probe 3, and the air-cooled probe body fitted to the sampling probe 3. After being cooled by 4, it is introduced into a gas meter 11 through a filter 7, a conduit 8, a dioxin sampling device 9 and a sampling suction pump 10.

In the air-cooled cooling probe 1, the air A (atmosphere) around the air-cooled probe main body 4 is cooled as cooling air A from one end of the cooling passage 4 a by the operation of the cooling suction pump 6. The sampling probe 3 and the sampled exhaust gas G are cooled by the sucked cooling air A.

That is, the cooling air A sucked into the cooling passage 4a passes through the sampling probe 3 in the cooling passage 4a.
After flowing along the straight pipe portion 3a, the air flows into the cooling jacket 4c from the communication port 4f, flows in the cooling jacket 4c along the longitudinal direction of the sampling probe 3, and then flows from the cooling air outlet 4g. Has been exhausted. Therefore,
The sampling probe 3 and the exhaust gas G flowing in the sampling probe 3 are cooled by heat exchange with the cooling air A flowing in the cooling passage 4a and the cooling jacket 4c of the air-cooled cooling probe 1.

The cooling air A whose temperature has risen due to heat exchange with the sampling probe 3 and the sampled exhaust gas G is discharged from the cooling air outlet 4g, passes through the suction hose 5 and the cooling suction pump 6, and enters the atmosphere. Has been released to

Since the air-cooled cooling probe 1 according to the embodiment of the present invention uses air A (atmosphere) as a cooling medium (heat exchange medium), it is possible to secure the cooling medium at the measurement site. A sufficient cooling effect can be obtained without the need for the cooling medium and the shortage of the cooling medium. Also, cooling air A
There is no fear of rapid volume expansion, and there is no possibility that the air-cooled probe body 4 is damaged. Further, it is not necessary to consider the discharge destination of the cooling air A after the heat exchange, and the cooling air A can be discharged into the atmosphere, so that the post-processing of the cooling air A after the heat exchange is extremely simple. It is. In addition, the cooling air A flowing through the cooling passage 4a comes into direct contact with the sampling probe 3, and the new cooling air A is sequentially sucked into the cooling passage 4a, so that the cooling effect is extremely excellent. ing. Thus, the air-cooled cooling probe 1 is extremely excellent in handling, operability, cooling performance, and the like.

In the above embodiment, the cooling air A (atmosphere) is sucked into the cooling passage 4a. However, in other embodiments, a pushing fan (not shown) is used. ) May be used to push the cooling air A (atmosphere) into the cooling passage 4a.

[0029]

As is apparent from the above description, the air-cooled cooling probe according to the first aspect of the present invention uses cooling air (atmosphere) as a cooling medium (heat exchange medium). ,
It is not necessary to secure a cooling medium at the measurement site, and a sufficient cooling effect can be obtained without running out of the cooling medium. Also, the cooling air has no fear of sudden volume expansion,
It does not damage the air-cooled cooling probe. Further, it is not necessary to consider the destination of the cooling air after the heat exchange, and the cooling air can be discharged into the atmosphere, so that the post-treatment of the cooling air after the heat exchange is extremely simple. In addition, since the cooling air flowing through the cooling passage is in direct contact with the sampling probe, the cooling effect is extremely excellent.

In the air-cooled cooling probe according to a second aspect of the present invention, a communication port and a cooling air outlet are respectively formed at both ends of the inner and outer cylinders, and one end of the cooling passage is opened to the atmosphere. The other end of the cooling passage is closed, and the air is sucked into the cooling passage from one end of the cooling passage by a suction pump or the like as cooling air. It flows smoothly and smoothly over the entire area of the inside of the jacket, and a more excellent cooling effect can be exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing an example of an exhaust gas sampling device using an air-cooled cooling probe for exhaust gas sampling according to an embodiment of the present invention.

FIG. 2 is a schematic system diagram showing another example of an exhaust gas sampling apparatus using an air-cooled cooling probe for exhaust gas sampling according to an embodiment of the present invention.

FIG. 3 is a schematic system diagram showing still another example of the exhaust gas sampling apparatus using the air-cooled cooling probe for exhaust gas sampling according to the embodiment of the present invention.

FIG. 4 is a schematic sectional view of an air-cooled cooling probe for sampling exhaust gas according to an embodiment of the present invention.

FIG. 5 is a sectional view taken along line II of FIG. 4;

FIG. 6 is a schematic sectional view of a conventional water-cooled cooling probe.

FIG. 7 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

1 is an air-cooled cooling probe, 2 is an exhaust gas duct, 3 is a sampling probe, 3a is a straight pipe portion of the sampling probe, 4 is an air-cooled probe main body, 4a is a cooling passage, 4b
Is an inner cylinder, 4c is a cooling jacket, 4d is an outer cylinder, 4f is a communication port, 4g is a cooling air outlet, 5 is a suction hose, 6 is a cooling suction pump, 12 is a heat-resistant sealing material, and A is cooling. Air and G are exhaust gases.

Claims (2)

[Claims] 1. A sampling probe inserted into an exhaust gas duct and sampling a part of the exhaust gas in the exhaust gas duct, and a sampling probe inserted into the exhaust gas duct and fitted over a straight pipe portion of the sampling probe to cool the sampling probe by cooling air. An air-cooled cooling probe for exhaust gas sampling comprising an air-cooled probe body to be cooled, wherein the air-cooled probe body covers a straight pipe portion of the sampling probe, and has a cooling passage through which cooling air flows between the straight pipe portion. An inner cylinder to be formed, an outer cylinder disposed around the inner cylinder to form a cooling jacket between the inner cylinder, and a communication port formed in the inner cylinder to communicate the cooling passage and the cooling jacket,
A cooling air outlet communicating with the cooling jacket, wherein the cooling air is discharged from the cooling air outlet through the cooling passage, the communication port and the cooling jacket sequentially. Features air-cooled cooling probe for exhaust gas sampling. 2. A communication port is formed at a distal end side of an inner cylinder located in an exhaust gas duct, and a cooling air outlet is formed at a base end side of an outer cylinder located outside the exhaust gas duct. One end of the cooling passage is opened to the atmosphere, the other end of the cooling passage is closed with a heat-resistant sealing material, and the cooling passage is connected to the cooling air outlet by a cooling suction pump connected via a suction hose. The air-cooled cooling probe for exhaust gas sampling according to claim 1, wherein the air is sucked into the cooling passage from one end of the cooling air as cooling air.