JP3033496B2 - 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.

[0003] In FIG. 4, P is 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. 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, and is heated and maintained at about the temperature of the exhaust gas.

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 supported by the metal fittings K1 and K2 via the end plate TP. 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 state shown in the figure, the yoke FL is positioned in the longitudinal direction, and a bolt SB is penetrated to the top.
By the screwing of B, the head piece HP is pushed inward relative to the case E, and the holding of the filter F is strengthened. 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 gas is cooled before entering the filter at the sampling stage. That is, the sampled gas is guided into the case E from the sampling hole SH in the flange P. Therefore, the gas touches the flange P before reaching the outer periphery of the filter F. The flange P is joined to the mounting pedestal on the chimney side and dissipates heat, so that moisture in the gas turns into a drain. This moisture combines with chlorine, sulfur dioxide, iron, and the like in the gas to generate iron chloride, alkali iron, sulfide, and the like, which corrodes and damages metals (support shafts and the like) in the probe. Although there is a method of increasing the temperature of the heater to prevent the temperature from decreasing, there is an economical problem because the electric capacity is increased or the heater is increased in size. The present invention has been made to solve the above problem, and has as its object to provide a sampling probe in which the sampled gas is not cooled by the flange.

[0008]

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 provided with a sealing member having a gas outlet to be sealed, a heater wound around the outer periphery, and a filter inside; a chimney inside the wound heater of the cylindrical case; (Flange) A gas sampling plate having a gas sampling hole provided at a position close to the side, and a gas pipe from the chimney side connected to the gas sampling hole of this sampling plate, Gas is introduced into the case inside the wound heater and passes through the filter to remove dust, and is led to a gas outlet formed in the sealing member, and the gas It is characterized in that so as to provide a total, and the like.

[0009]

FIG. 1 shows the internal structure of a gas sampling probe provided by the present invention. In the drawing, reference numeral 1 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, and 2 denotes an opening 1 of the flange 1.
This is a cylindrical case that is inserted and welded into H. 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 closer to the chimney side.
And a gas sampling hole 4H is formed. A gas pipe KP from the chimney side is connected to the gas sampling hole 4H. This structure is a feature of the present invention.

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. This filter 5 is in the form of an elongated container with a deep bottom. 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.
An opening 7T for guiding gas to the outlet 7P is formed in the center. Reference numeral 8 denotes an outer sealing member which is fitted into the extension case 3 similarly to the intermediate sealing member 7. As shown in the figure, a pin 7S is implanted in the center of the intermediate sealing member 7, and a concave portion 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 positioned in the longitudinal direction, and a bolt 12 penetrates the top, and the tip of the bolt 12 contacts the gripping head 8K of the outer sealing member 8.

A shallow concave portion 7A is formed on the side surface of the filter 5 of the intermediate sealing member 7, and a shallow depth of the 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 flange portion 5F of the filter 5 corresponds to the opening 7T of the intermediate sealing member 7, and the gas flows smoothly. Reference numeral 15 denotes a heater wound around the outer periphery of the case 2.

When assembling the gas sampling probe of the present invention, when the bolt 12 is screwed in, the outer sealing member 8 and the intermediate sealing member 7 are pushed inward relative to the extension case 3. As a result, the O-rings 13 and 14 are inserted elastically. When removing the filter 5 and the sealing members 7 and 8, the yoke 11 is bent around the fulcrum of the bolt 10 and removed. Then, first, the gripping head 8K of the outer sealing member 8 is gripped and extracted, and then the pin 7S of the intermediate sealing member 7 is gripped and extracted. Then, there is no obstacle in the cases 2 and 3, and 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 KP 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.

[0014] With such a configuration, dust removal of the exhaust gas is reliably performed.
The inside is heated by a heater 15 wound around the outer periphery thereof and has a temperature equal to or higher than the acid melting point of the exhaust gas. Since the sampling plate 4 is provided in the case 2 inside the heater 15, the filter 5 in the case 2 Is directly introduced into the opening 4H of the sampling plate 4 through the pipe KP, so that the gas does not touch the flange or the like and there is no possibility of cooling. In the case of the illustrated example, the sealing member for sealing the opening of the case 2 is also divided into two parts, and between the filter 5 and the intermediate member 7 and between the intermediate member 7 and the outer member 8. In addition, since the air layers 7A and 8A are formed, the heat of the filter 5 escapes and the gas is not cooled and the filter 5 is cooled, which is effective for maintaining the temperature of the filter 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.

First, a feature of the present invention is that a gas introduction pipe (piping) is provided for directly guiding a sampled gas into a cylindrical case in which a filter inside a heater wound around the outer periphery is provided. Is connected to the inside of one end. FIG. 1 shows an embodiment in which a sampling plate is provided in a case and a pipe is connected to the case to make it easy to manufacture with a simple structure and economically inexpensive. However, as shown in FIG. A sampling plate 4 may be interposed between 1 and the case 2, and the threaded portion N of the pipe KP may be screwed into the opening 4H of the sampling plate 4. In this case, it is effective if the sampling plate 4 is made of a heat insulating material. Further, as shown in FIG. 3, one end side of the case 2 is bent inward to form the flange portion 2F and the inner cylindrical portion 2E integrally,
The screw portion N of the pipe KP may be screwed into the screw portion of the inner cylindrical portion 2E. In this case, there is an advantage that it is not necessary to weld a separate sampling plate to the case.

Furthermore, in the illustrated example, the case has a shape in which two members are welded and joined. However, the fact that this is formed of a single cylindrical member can be easily changed by those skilled in the art. Although the sealing member is configured as a two-part type, the present invention extends to an integral type that does not divide as in the related art. It is not always necessary to provide a method for pushing the sealing member into the case, and even if such a method is provided, the means for that is not limited to a method using a yoke and bolts. However, the illustrated embodiment is a probe that is compact and easy to handle at the time of actual gas sampling. The invention embraces all these alternative embodiments.

[0018]

As described above, the gas sampling probe provided by the present invention is as described above. Therefore, the gas introduced into the filter is cooled by touching the flange and the gas is cooled. The generation of corrosive substances such as alkali iron and sulfate is eliminated, and the durability of the gas sampling probe can be significantly improved. In addition, an economical prober having a simple configuration, a low heating cost and an economical cost can be provided.

[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 a modification of the gas sampling probe according to the present invention.

FIG. 3 is a diagram showing a modification of the gas sampling probe according to the present invention.

FIG. 4 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 KP ... Gas Piping

──────────────────────────────────────────────────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 sealing member having an opening joined to a mounting base on a chimney side, and a sealing member having one end inserted and fixed in the opening of the flange and a gas outlet sealing the opening on the other end. A cylindrical case provided with a heater wound around the outer periphery and having a filter therein, and a gas provided inside the cylindrical case at a position closer to a chimney (flange) side inside the wound heater. A gas sampling plate having a sampling hole, and a gas pipe from the chimney side connected to the gas sampling hole of the sampling plate, and the gas from the gas pipe is supplied to the inside of the case inside the wound heater. Gas sampling, wherein dust is removed by passing the gas through the filter, guided to a gas outlet formed in the sealing member, and supplied to a gas analyzer or the like. probe.