JPH09318504A - Dilution ratio measuring equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equipment capable of simply measuring dilution ratio with high reliability. SOLUTION: A diluent gas line 2 for introducing diluent gas is combined and connected with a sampling line 1 for introducing sampling gas from a flue 3 to a gas analyzer 10. A calibration gas line 16 for introducing calibration gas is combined and connected with a part between the confluence point 15 of the diluent gas line in the sampling line 1 and the gas analyzer 10, in such a manner that switching operation is enabled. A bypass line 22 is connected with a part between the calibration gas line 16 and the diluent gas line 2, in such a manner that switching operation is enabled.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention belongs to the technical field of a dilution rate measuring device provided in a gas analyzer using a dilution method.

[0002]

2. Description of the Related Art In a gas analyzer using the dilution method, in order to measure the dilution rate, for example, as shown in FIG. 3, sampling lines a and dilution gas lines b are provided with flow meters c and d, respectively. The dilution rate was calculated by comparing the flow rates. In the figure, e is a flue, f is a probe,
g is a pump, h is a switching valve, i is a gas analyzer, and j is a calibration gas cylinder.

Further, a span gas having a known concentration is introduced from the inlet (probe f) of the sampling line a, the concentration of the diluted span gas is measured by the gas analyzer i, and the measured value is compared with the known concentration. In some cases, the dilution rate was calculated.

[0004]

However, in the former method of the prior art, since the reading error of the flowmeters c and d and the deterioration of accuracy due to deterioration are directly reflected in the dilution rate, a highly reliable dilution rate can be obtained. It wasn't easy to get.

In the latter method, the sampling line 1 needs to be removed from the flue 3, which requires a lot of work, which is time-consuming and costly.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a device capable of easily measuring the dilution ratio with high reliability.

[0007]

The present invention comprises means for solving the above-mentioned problems as follows. That is, the sampling line for introducing the sample gas from the flue gas into the gas analyzer, the dilution gas line for introducing the dilution gas is joined and connected, and the confluence point of the dilution line in the sampling line and the A calibration gas line for introducing the calibration gas is connected to the gas analyzer so as to be switchable, and a bypass line is switchably connected between the calibration gas line and the dilution gas line. It is characterized by doing.

According to a second aspect of the present invention, the atmosphere introducing means capable of switching operation is provided in the preceding stage of the confluence point of the dilution gas line in the sampling line according to the first aspect.

[0009]

According to the invention as set forth in claim 1, since the calibration gas can be introduced into the dilution gas line, the atmosphere is sucked from the sampling line inlet when the boiler is stopped, and the atmosphere is bypassed from the bypass line. The dilution rate can be obtained by introducing the calibration gas and measuring the concentration thereof.

According to the second aspect of the present invention, even during the operation of the boiler, the sampling from the flue is stopped, the air is introduced from the atmosphere introducing means, and the calibration gas is introduced from the bypass line to dilute. The rate can be calculated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the dilution ratio measuring device of the present invention will be described in detail below. FIG. 1 shows the configuration of a gas analyzer equipped with a dilution rate measuring device. Reference numeral 1 is a sampling line, 2 is a dilution gas line for supplying a dilution gas (air in this embodiment), and the sampling line 1 includes The probe 4, the filter 5, the pump 6, which faces the flue 3,
A pressure regulating valve 7, a needle valve 8, an electromagnetic three-way valve 9, and a gas analyzer 10 are provided. On the other hand, the dilution gas line 2 is provided with a filter 11, an electromagnetic three-way valve 12, a pressure regulator 13, and a capillary 14. The dilution gas line 2
Are connected to the sampling line 1 at a confluence 15. The portions surrounded by broken lines in the sampling line 1 and the dilution gas line 2 are heating conduits.

On the other hand, a calibration gas line 16 is connected to the electromagnetic three-way valve 9 provided in the sampling line 1, and the calibration gas line 16 is connected to the calibration gas line 16.
7, pressure regulator 18, needle valve 19, solenoid valve 2
0, an electromagnetic three-way valve 21 is provided, and the electromagnetic three-way valve 21 is connected to the electromagnetic three-way valve 12 of the dilution gas line 2 via a bypass line 22. The portion surrounded by the alternate long and short dash line is provided in the oven.

With the above-described structure, when the boiler is stopped, the air (atmosphere) in the flue 3 is sucked from the probe 4 and the three electromagnetic three-way valves 12, 20, 21 are turned on to operate the bypass line. The dilution rate can be easily obtained by introducing the calibration gas into the sampling line 1 via 22 and confirming the concentration thereof with the gas analyzer 10. Since the pressure regulator 13 and the capillary 14 are provided downstream of the electromagnetic three-way valve 12 in the dilution gas line 2, there are a case where the dilution gas is introduced from the filter 11 and a case where the calibration gas is introduced from the bypass line 22. Needless to say, the same flow rate condition can be set.

FIG. 2 shows a different embodiment, in which an atmosphere introducing means 33 consisting of an electromagnetic three-way valve 31 and a filter 32 is provided between the confluence 15 of the sampling line 1 and the filter 5 so that the boiler can be operated at any time even during boiler operation. The dilution ratio can be measured. In this case, the electromagnetic three-way valve 31
By turning on, the air can be introduced into the sampling line 1 via the filter 32, and the air is diluted with the calibration gas introduced from the dilution gas line 2,
The dilution rate can be obtained by measuring the concentration with the gas analyzer 10 (see FIG. 1).

With such a dilution ratio measuring device, since the dilution ratio can be calibrated by simply operating the solenoid valve, an automatic calibration program can be set so that the calibration can be automatically carried out periodically. It is possible to maintain and improve the measurement accuracy.

[0016]

As described above, according to the present invention,
Since the calibration gas can be introduced into the dilution gas line, when the boiler is stopped, the dilution rate can be easily calibrated by introducing the calibration gas into the atmosphere sucked from the sampling line inlet and measuring its concentration. .

Further, by providing the sampling line with the air introducing means which can be freely switched, the calibration gas can be taken into the sampling line together with the atmosphere even during the boiler operation, and the dilution rate can be calibrated more easily. Become.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a dilution ratio measuring device of the present invention.

FIG. 2 is a main part configuration diagram of the different embodiment.

FIG. 3 is an explanatory diagram of a conventional dilution ratio measuring method.

[Explanation of symbols]

1 ... Sampling line, 2 ... Diluting gas line, 3 ... Flue, 10 ... Gas analyzer, 15 ... Confluence point, 16 ... Calibration gas line, 22 ... Bypass line, 33 ... Atmosphere introducing means.

Claims (2)

[Claims] 1. A diluting gas line for introducing a diluting gas is connected to a sampling line for introducing a sample gas from a flue gas into a gas analyzer, and the diluting gas line of the diluting gas line in the sampling line is connected. A calibration gas line for introducing a calibration gas is confluently connected between the confluence point and the gas analyzer for switching operation, while a bypass line is switched between the calibration gas line and the dilution gas line. A dilution rate measuring device characterized in that it is operably connected. 2. The dilution ratio measuring device according to claim 1, wherein the sampling gas line is provided with an atmosphere introducing unit that can be switched and operated before the confluence point of the dilution gas line.