JP3033495B2 - Gas sampling probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe (introducer) having a function of sampling gas from a chimney and removing dust when exhaust gas (smoke) from a chimney is analyzed by a gas analyzer. About.

[0002]

2. Description of the Related Art This type of gas sampling probe is
Usually a cylindrical case that is easy to attach to a chimney etc.
A cylindrical filter is provided on the inner side of the case, a gas sampling hole is provided at one end of the case, that is, a chimney side, and a sealing member (commonly referred to as a headpiece) for sealing the opening at the other end. ), Gas (smoke) from the sampling hole is passed through a filter to remove dust, guided to an outlet provided in a sealing member, and passed through a pipe connected to the outlet to a gas analyzer or the like. Is provided. Specifically, it is as shown in FIG.

In FIG. 3, reference numeral P denotes a flange which is joined to a mounting base (not shown) on the chimney side to mount the entire sampling probe GS to the mounting base. This mounting is fixed by bolts B or the like. It is attached.
The flange P is provided with a sampling hole SH for sampling gas (smoke) from the chimney side. Further, a cylindrical case E having the center of the sampling hole SH as an axis is welded and fixed to the flange P to form a base of the sampling probe GS. A band heater BH is wound around the outer periphery of the case, so that the inside of the probe is heated and maintained.

On the other hand, at the other end of the cylindrical case E, a sealing member (hereinafter referred to as a headpiece) HP for sealing the opening side of the other end is mounted. This headpiece HP
The filter support shaft S is screwed into the center of
A cylindrical filter F is held between the head of the support shaft S and the inner surface of the head piece HP. The support shaft S, the cylindrical filter F and the case E are arranged concentrically.
Further, an exhaust gas outlet DP is formed inside the headpiece HP around the screwed portion of the support shaft S. Although not shown, the outlet DP is provided with a pipe connected to a gas analyzer, and the gas discharged from the outlet DP is analyzed by the gas analyzer.

[0005] With the above configuration, the gas sampled from the chimney is guided into the case E and passes through the filter F from the outer periphery of the filter F. After the dust is removed by this passage, the gas of the head piece HP is removed. It is discharged from the outlet DP and supplied to the gas analyzer to analyze its components.

Here, K1 is a filter support fitting locked on the head of the support shaft S, and K2 is a filter support fitting locked on the head piece HP side of the support shaft S. The filter F is connected to the metal fittings K1 and K2 via the end plate TP.
Is supported. The support shaft S is screwed into the head piece HP, and the two support fittings K1 and K2 elastically hold the filter F. The headpiece HP is sealed to the case E by an O-ring OL and a seal packing member PA so that the sampling gas does not leak to the outside. RP is a receiving plate. A boss T is projected from the open end of the case E, and a long semicircular yoke FL is rotatably attached to the boss T by a bolt SP. In the illustrated state, the yoke FL is positioned in the longitudinal direction, the bolt SB is penetrated to the top, and the head piece HP is turned into the case E by screwing in the bolt SB.
And the filter F is pressed inward relatively to the filter F, thereby firmly holding the filter F. When removing the headpiece HP from the case E, the yoke FL is bent around the fulcrum of the bolt SP and removed.

[0007]

In the case of this type of sampling probe GS, the gas passes through the filter at a high temperature to remove dust. In this case, the temperature inside the probe is generally determined by the acid dew point of the exhaust gas. The condition is that the temperature is maintained at about 150 ° C. or more. Therefore, the band heater BH is wound as described above.
However, in the case of the conventional sampling probe GS, the filter is directly and surface-bonded to the headpiece HP, while the outside of the headpiece HP is exposed to the outside air, so that the heat of the filter is transmitted to the headpiece HP. Then, it is scattered outside from the outer surface of the headpiece HP, and thus the temperature of the filter decreases. As a result, the gas passing through the filter is cooled, and moisture is drained from the gas. Then, this moisture combines with chlorine and sulfur dioxide in the exhaust gas, iron in the probe body, etc., to generate iron chloride, alkali iron, sulfate, etc., which corrodes metals (support shafts, etc.) in the probe. And will be damaged. There is a method of increasing the temperature of the heater to prevent the temperature from decreasing. However, there is a problem that the electric capacity is increased or the heater is enlarged.

The present invention has been made in order to solve the above problem, and has as its object to provide a sampling probe in which heat of a filter is not scattered outside through a headpiece.

[0009]

A sampling probe provided by the present invention has a flange having an opening joined to a mounting base on the chimney side, one end inserted into and fixed to the opening of the flange, and the other end having an opening. A cylindrical case in which a heater is wound around the outer periphery and a filter is provided coaxially with the inner periphery of the sealing member; And an air layer is formed between the filter and the intermediate sealing member, and between the intermediate sealing member and the outer sealing member. It is characterized in that heat is transmitted to the outer sealing member and scattered outside is suppressed.

[0010]

FIG. 1 shows the internal configuration of a gas sampling probe provided by the present invention, and FIG. 2 shows the appearance of the gas sampling probe of the present invention. In these figures, reference numeral 1 denotes a flange which is joined to a mounting pedestal (not shown) on the chimney side to mount the entire sampling probe GS to the mounting pedestal, and 2 denotes a cylindrical shape which is inserted and welded into the opening of the flange 1. Case. Reference numeral 6 denotes a bolt for joining the flange 1 to a mounting base (not shown) on the chimney side. Reference numeral 4 denotes a gas sampling plate provided inside the case 2 at a position close to the chimney side, which is welded to the case 2 and has a gas sampling hole 4H. A gas pipe GP from the chimney side is connected to the gas sampling hole 4H.

Reference numeral 5 denotes a filter which is arranged concentrically with respect to the axis of the case 2, and is made of, for example, a mesh member made of stainless steel. The filter 5 is in the form of an elongated container having a deep bottom, and the bottom portion is a gas sampling plate 4.
Facing. A flange 5F is formed on the opening side of the filter 5 and is locked to a step 3K of the extension case 3 welded to the upper end of the case 2. Reference numeral 7 denotes an intermediate sealing member that is inserted into the extension case 3, and an opening 7T that guides gas to the outlet 7P is formed in the center. Reference numeral 8 denotes an outer sealing member, which is the same as the intermediate sealing member 7 and the extension case 3.
It is inserted in. As shown in the figure, the intermediate sealing member 7
Has a pin 7S implanted in the center thereof, and a recess 8G for receiving the pin 7S is formed in the outer sealing member 8. Further, the outside of the outer sealing member 8 is formed with a gripping head 8K for gripping by hand so as to facilitate extraction. Numeral 11 denotes a yoke having a long semicircular arc shape, and both ends are rotatably held around a bolt 10 screwed into a boss 9 of the extension case 3 as a support shaft. In the illustrated state, the yoke 11 is located in the longitudinal direction, the bolt 12 is penetrated to the top,
The tip of the bolt 12 is the gripping head 8K of the outer sealing member 8.
Is in contact with

A shallow concave portion 7A is formed on the side surface of the filter 5 of the intermediate sealing member 7, and the shallow concave portion 7A is also formed on the side surface of the intermediate sealing member 7 of the outer sealing member 8. A recess 8A is formed. Due to the presence of these recesses 7A and 8A, an air layer is formed between the filter 5 and the intermediate sealing member 7 and between the intermediate sealing member 7 and the outer sealing member 8. Further, the intermediate sealing member 7 and the outer sealing member 8
An O-ring 14 for sealing is interposed between the sealing member 7 and the sealing member 7, 8 to ensure the sealing, and between the intermediate sealing member 7 and the extension case 3. Also, an O-ring 13 for sealing is interposed to perform sealing. The opening of the filter 5 on the flange portion 5F side is a sealing member 7.
And the gas flows smoothly. Reference numeral 15 denotes a heater wound around the outer periphery of the case 2, and the case 2 is heated by a power source (not shown).

When assembling the gas sampling probe according to the present invention, when the bolt 12 is screwed in, the outer sealing member 8 and the intermediate sealing member 7 are relatively inward with respect to the extension case 3. O-ring 1
It is elastically fitted and inserted with the intervention of 3 and 14. When the filter 5 and the sealing members 7 and 8 are to be removed, FIG.
As shown by the two-dot chain line, the yoke 11 is bent around the bolt fulcrum and removed. Then, first, the gripping head 8K of the outer sealing member 8 can be gripped and extracted, and then the pin 7S of the intermediate sealing member 7 is gripped and extracted. Then
Case 3 is formed with a cylindrical hole, eliminating obstacles,
The filter 5 can be removed from the openings of the cases 2 and 3. Then, the filter 5 can be washed or replaced, and further, the inside of the case can be cleaned and maintained.

With the above configuration, the exhaust gas (smoke) from the chimney is guided into the case 2 from the gas pipe GP from the chimney side, and passes through the filter 5 from the outer periphery of the filter 5.
By this passage, dust in the gas is removed. The gas from which dust has been removed and purified is guided from the opening 7T of the intermediate sealing member 7 to the outlet 7P, and is supplied to a gas analyzer or the like via a pipe or the like connected thereto.

With such a configuration, dust removal of the exhaust gas is reliably performed. In this case, the heat inside the probe 5 is transferred to the outer sealing member 8 by the intermediate sealing member 7 and the air layers. And it is difficult to be scattered outside.

In the case of the illustrated example, the gas pipe GP from the chimney side is connected to the gas sampling hole 4H of the gas sampling plate 4 provided inside the case 2 near the chimney side. The cooled gas is not cooled by the flange 1, which is effective for maintaining the temperature inside the probe 5.

The present invention has been described above.
The present invention is not limited to the above and illustrated examples, but includes various modified embodiments utilizing the features of the present invention. For example, in the illustrated example, the case has a shape in which two members are welded and joined. However, configuring this as one cylindrical member can be easily changed by those skilled in the art. The shapes of the outer sealing member and the intermediate sealing member are not limited to the illustrated example. In particular, the means for forming the air layer is not limited to providing the illustrated concave portion. May be hermetically fixed to the case at a slight interval. In this case, processing for forming the concave portion is unnecessary, but it is necessary to securely fix the sealing member. When forming the concave portion, it can be formed on both surfaces of the intermediate sealing member. It should be noted that the mechanism for pushing the sealing member into the case in the illustrated example is not necessarily provided, and even if provided, the means for this is not limited to a system using a yoke and bolts. However, the illustrated embodiment is a probe that is compact and easy to handle in actual gas sampling. Further, the gas pipe from the chimney side is extended to the inside of the case to prevent the gas from being cooled by the flange, but this point may be a conventional configuration.

In the illustrated example, the gas outlet is provided in the intermediate sealing member so as to reduce the cooling of the gas. However, the gas outlet may be provided in the outer sealing member. . Although the shape of the filter is not necessarily limited to a cylindrical shape, the case is formed in a cylindrical shape in order to improve the sealing function, and the filter is also cylindrical in order to smoothly and quickly remove gas dust. It is desirable that The invention embraces all these alternative embodiments.

[0019]

According to the gas sampling probe of the present invention, the heat inside the probe is transmitted to the outer sealing member and is scattered to the outside from the outer surface to lower the temperature inside the probe and cool the passing gas. Is eliminated, and the generation of corrosive substances such as iron chloride, alkali iron, and sulfide due to the drainage of moisture in the gas is eliminated, and the corrosion resistance of the gas sampling probe can be significantly improved. In addition, it is possible to provide an economical gas sampling probe with a simple configuration, low heating cost, and low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a gas sampling probe according to the present invention.

FIG. 2 is a diagram showing an appearance of a gas sampling probe according to the present invention.

FIG. 3 is a view showing a conventional gas sampling probe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flange 2 ... Case 3 ... Extension case 4 ... Gas sampling plate 5 ... Filter 7 ... Intermediate sealing member 8 ... Outer sealing member 11 ... Yoke 12 ... Bolt 13, 14 ... O-ring 15 ... Heater

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 1/22 G01N 1/00 101

Claims (1)

(57) [Claims] 1. A flange having an opening joined to a mounting pedestal on a chimney side, a sealing member for inserting and fixing one end side to the opening of the flange and sealing the opening on the other end side, and at the outer periphery. A cylindrical case in which a heater is wound and a filter is provided coaxially inside the cylindrical case, and the sealing member is divided into two sealing members at an intermediate portion and an outer portion in a longitudinal direction of the case; An air layer is formed between the member and the intermediate sealing member and the outer sealing member, and the heat of the filter is transmitted to the outer sealing member and scattered to the outside by the interposition of the intermediate sealing member and the air layer. A gas sampling probe characterized in that the gas sampling probe is configured to suppress the occurrence.