JPH044197Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] For example, when controlling combustion in boilers, etc.
Analyze the exhaust gas, measure the oxygen concentration in it, and adjust the degree of opening and closing of the damper based on the signal.
Efforts are being made to optimize the amount of air supplied to the boiler.

This invention relates to an oxygen measuring device in the above-mentioned cases, and particularly relates to a column used for pretreatment for gas analysis.

[Conventional technology and its problems] An oxygen sensor was installed directly in the exhaust gas passage. Therefore, the exhaust gas that comes into contact with the sensor has a very high temperature and contains a lot of water vapor and dust, which sometimes causes errors in the analysis results.

[Means for Solving the Problems] This invention aims to solve the above problems, and is designed to reduce the effects of high temperatures, water vapor, and dust, and to minimize measurement errors.

As shown in FIGS. 1, 2, and 3, this device has the following features: (1) The measurement gas 50 is guided to the oxygen measuring device 54 through the gas passage 52 (FIG. 3); (2) A pretreatment column 60 for gas analysis as described below is disposed in the middle of the passage of the measurement gas; (3) The pretreatment column 60 for gas analysis is composed of a large number of small metal pieces filled in the case 10. a moisture cooling condensation zone 62 that cools and condenses the moisture in the gas to be measured by the cooling condensation zone 62; and a dehumidification zone 64 that removes and dries the moisture in the gas using a dehumidifier installed in the case 22 disposed at the rear of the cooling condensation zone 62. It is characterized by consisting of.

[Example] In FIGS. 1, 2, and 3, 60 is a pretreatment column for gas analysis, and a moisture cooling condensation zone 62
and a dehumidification zone 64.

10 is the case of the moisture cooling condensation zone 62. This is a transparent cylinder made of acrylic, for example. Further, the size is, for example, about 25 mm in outer diameter and 70 mm in length.

A drain filter 12 is filled into the case 10. It consists of many small metal flakes. The role of this drain filter 12 is to 1) lower the temperature of the exhaust gas, and 2) trap large particles in the exhaust gas.

For 1), a material with a large surface area is preferable, and therefore a thin material is preferable. Moreover, it is better to have a complex shape than a flat one. Also, rather than arranging the metal flakes in an orderly manner, it is better to fill them randomly so that the gaps (gas paths) created between them are as complex as possible.

Any readily available metal may be used. In this case, since the case 22 that also serves as a handle and the coupler 26, which will be described later, are made of aluminum, the shavings generated during processing are used as they are. This aluminum shavings meet exactly the above requirements.

A suction pipe 14 is connected to the front of the case 10 (left side in the figure, see arrow 13) by a coupler 16. 18 is an O-ring. The coupler 16 is provided with an exhaust gas passage 20 passing through it in the front-rear direction. This coupler 16 is made of aluminum, for example. Therefore, this shavings can also be used as the drain filter 12 described above.

22 is a case of the dehumidification zone 64 and also serves as a handle. This is made of, for example, a cylindrical body made of aluminum as described above, and a gas outlet 24 is provided protruding from the rear end.

The handle case 22 and the case 10 are connected by a coupler 26. 28 is an O-ring.
A protrusion 30 is provided at the front end of the coupler 26, and a gas passage 32 is provided in the center.

A filter 36 is provided inside the case 22 which also serves as a handle. This is made of polyvinyl amecol, for example.
It is shaped like a tip turned on its side. Note that a gap 37 is provided between the filter 36 and the inner surface of the case 22, so that gas can easily pass over a wide area.

The filter 36 is filled with a desiccant 38, such as silica gel. Then, the front side is covered with a wire mesh 40.

A rubber tube 42 is fitted into the outlet 24.

[Operation] As shown in FIG. 3, a pretreatment column 60 for gas analysis is inserted in the middle of the gas passage 52 (in this case, at the tip).

Insert the suction pipe 14 into the exhaust gas, and connect the rear end of the rubber tube 42 to the oxygen meter 54.

Then, the oxygen measuring device 5 is sucked by the pump.
Lead to 4. Although the pump is built into the oxygen measuring device 54, it may be provided separately.

Then, the exhaust gas flows through the suction pipe 14 and the coupler 16.
It enters the case 10 of the moisture cooling condensation zone 62 through the inner passage 20 and comes into contact with the drain filter 12 made of the metal foil described above. This will 1) lower the temperature of the exhaust gas, 2) cause some of the water vapor to condense, resulting in less moisture, and 3) remove large debris.

The exhaust gas treated as described above is passed through the small holes 34,
It passes through the passage 32 and enters the handle case 22 of the dehumidification zone 64. Further, the protrusion 30 of the coupler 26 is provided with a brim, forming a space 11 in which condensed water accumulates. The condensed water will accumulate in this space and will be discharged to the outside by removing the coupler 26.

From the exhaust gas that has entered the case 22 that also serves as a handle, somewhat large dust is removed by a wire mesh 40, moisture is reduced by a desiccant 38, and finally fine dust is also removed by a filter 36. It is led through the rubber tube 42 to an oxygen measuring device 54 .

The case 10 and the handle case 22 can be easily removed, so the drain filter 12 and desiccant 3 can be easily removed.
When the function of 8 deteriorates, it can be easily replaced.

[Effect of the invention] In an oxygen measuring device in which the measuring gas is guided to the oxygen measuring device through a gas passage; in the middle of the passage of the measuring gas; a large number of small metal pieces filled in the case remove moisture in the measuring gas. A pretreatment column for gas analysis consists of a moisture cooling condensation zone that cools and condenses the gas, and a dehumidification zone that removes moisture from the gas and dries it using a dehumidifier installed inside the case located at the rear of the cooling condensation zone. Since the exhaust gas is disposed in the moisture cooling condensation zone 62 and the dehumidification zone 64,
The flow passes through in order.

During this time, as described above, the temperature of the exhaust gas is lowered, water vapor and dust are effectively removed, and the exhaust gas is led to the oxygen measuring device 54.

Therefore, the measurement error becomes very small.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a pretreatment column for gas analysis used in an embodiment of the present invention, Fig. 2 is an exploded explanatory diagram thereof,
FIG. 3 is an overall schematic explanatory diagram. 10...Case, 12...Drain filter, 1
4... Suction pipe, 16... Coupler, 22... Case that also serves as handle, 26... Coupler, 36... Filter, 38... Desiccant, 40... Wire mesh, 50
...Measurement gas, 52...Gas passage, 54...Oxygen measuring device, 60...Pretreatment column for gas analysis, 62
... Moisture cooling condensation zone, 64 ... Dehumidification zone.

Claims (1)

[Claims for Utility Model Registration] In an oxygen measuring device in which a measuring gas is guided to an oxygen measuring device through a gas passage, the measuring gas is guided by a large number of small metal pieces filled in a case in the middle of the measuring gas passage. For gas analysis, it consists of a moisture cooling condensation zone that cools and condenses the moisture in the gas, and a dehumidification zone that removes and dries the moisture in the gas using a dehumidifier installed inside the case located at the rear of the cooling condensation zone. An oxygen measuring device comprising: a pretreatment column.