JPS5819533A - Continous gas analyzing device - Google Patents

Abstract

PURPOSE:To periodically detect the occurrence of abnormality at a sample gas collecting part, by switching a gas switching cock, and thereafter measuring the delay time until the gas is actually detected by the analyzing part. CONSTITUTION:The sample gas is collected by a samping probe 2. The drain is separated by a drain separating means 3. Humidity is removed by a cooler 4. Dust is removed by a filter 5. At the time of measuring, the sample gas which is forcibly sent from a pump 6 is sent to the analyzing part 8 through a gas switching cock 7. At the time of calibration, standard gas is sent to the analyzing part 8 from a standard gas bomb 9. Meanwhile, a control part 12 detects an instruction value signal from the analyzer which is outputted at every specified short time period. The amount of the change switches the gas switching cock 7. When the amount of the change has exceeded the specified amount and the delay time has exceeded a specified value, a warning output is issued. Thus the occurrence and degree of abnormality such as the freezing of the coller 4, clogging of the filter 5, and degradation of the pump 6 can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a continuous gas analyzer that continuously collects and analyzes combustion exhaust gas, etc. for a long period of time, and is mainly capable of suitably detecting the occurrence of an abnormality in a sample gas sampling section. To provide a continuous gas analyzer with high performance.

The sample gas sampled with this type of continuous gas analyzer is often a dirty gas. For example, combustion exhaust gas generally contains a large amount of moisture and dust.

Therefore, the sample gas is pretreated with a filter, dehumidifier, etc. in the sample gas sampling section of the device before being supplied to the analysis section, but if these filters, MAI devices, etc. are not normal, the analysis section will be interrupted. However, the degree of deterioration varies depending on, for example, the properties of combustion exhaust gas, so even if you replace the d-filter, it is difficult to accurately maintain it. It was difficult to do this with timing.

This invention was made in view of this situation, and it is possible to quantitatively detect any abnormality when it occurs in the sample gas sampling section, thereby facilitating and properly maintaining the device. A continuous gas analyzer is provided.

That is, in this invention, the sample gas sampling section and the standard gas supply section are each connected to the analysis section via the gas switching cock,
In a continuous gas analyzer, the sample gas is supplied from the sample gas sampling section to the analysis section during measurement, and the standard gas is supplied from the standard gas supply section to the analysis section during one calibration. Nine continuous sensors are equipped with a delay detection means for measuring the delay time until the switched gas is actually detected up to the analysis unit after switching the gas, and an output means for outputting an output when the delay time exceeds a predetermined value. Provides gas analysis equipment.

In the above, when the calibration is completed and the gas switching cock is switched, the sample gas is supplied to the analysis section, replacing the standard gas that had been flowing to the sample section up to that point. It is inversely proportional to the flow rate of sample gas from the gas sampling section. Therefore, if an abnormality such as filter clogging occurs, the flow rate of the sample gas will decrease and the above replacement time will become longer.This can be quantitatively detected by the longer delay time, so in the end, the sample gas will be collected. This means that abnormalities in the parts can be quantitatively detected by the delayed detection means.

By the way, when the gas switching cock is switched to perform calibration, the standard gas is supplied to the analysis section in place of the sample gas that had been flowing to the analysis section, but the replacement time for both gases is determined by the time taken from the standard gas supply section. Inversely proportional to standard gas flow rate. Therefore, for the same reason as mentioned above, it is also possible to quantitatively detect abnormalities in the standard gas supply section using a delayed detection means.

The output means outputs one output when the delay time measured by the delay detection means exceeds a predetermined value, and the length of the delay time represents the degree of abnormality in the sample gas sampling section or the standard gas supply section. Therefore, this means that an output is generated when the degree of abnormality exceeds a certain limit. Therefore, this output signal has the meaning as an alarm signal as it is.

Hereinafter, this invention will be explained in detail based on embodiments shown in the drawings.

(1) shown in FIG. 1 is an embodiment of the continuous gas analyzer of the present invention. Sample gas is collected using a sampling glove (
2), the drain is separated by the drain separator means (31), dehumidified by the cooler (4), and filtered (31).
Dust is removed in step 5) and pumped out by pump 16).

These elements (21 to (6)) constitute the sample gas collection section. During measurement, the sample gas pumped from the pump (6) is sent to the analysis section (8) via the gas switching cock (7). - During calibration, the standard gas is transferred from the standard gas cylinder (9) to the analysis section (8) by switching the gas switching cock (7).
) will be sent to. 〇 is the flow rate needle, and 〇(2) is the control unit, which is controlled by a microcomputer with a built-in clock, and performs the following operations.〇
- i.e. the analysis section (8) every predetermined short time (e.g. 8 seconds);
Detects the indicated value signal, obtains the amount of change from this, and calculates the delay time until the amount of change exceeds a predetermined amount (for example, 8ts of the upper measurement limit) after the gas switching cock (7) is switched to -. demand. To explain this using one specific example, as shown in Figure 2, the analysis section (8
), the upper limit of measurement I18 is α, the standard gas is Zep gas, and the indicated value is 0 for the standard gas, and the device is equipped with an automatic calibrator. The instrument detects the switching time (to) from the signal that switches the gas switching corrector (7) at the ninth point of zero-span calibration, and after that, when the above change in the indicated value of the analysis section β) becomes O, OSα. The time (tl) of is detected, and the delay time τ of the standard gas is determined from the difference. In addition, the switching time ([2) is detected from the signal for switching the gas switching cock (7) to complete the zero-span calibration and perform measurement again, and when the above change in the analysis section (8) becomes 0.08α. Detect the time (t3) and calculate the delay time T of the sample gas from the difference. Also, let Tf be T for the standard sample gas flow rate when the sample gas sampling section is normal, and measure this. memorize it. At the same time, the standard τ0 of the standard gas delay time τ is also measured and stored.

Furthermore, T and τ measured during operation of device +11 and said T0 and τ. When the difference exceeds a predetermined value, an alarm is output. To explain this with a specific example, if To is about 200 seconds, T will output an output for about 4 seconds, which is 20 seconds (that is, when T becomes 24 seconds). .

The control section (2) constitutes a delay detection means and an output means.

As configured as described above, the continuous gas analyzer of the present invention can prevent, for example, freezing of the cooler (4), clogging of the filter (5), and clogging of the pump (6) in the apparatus (1) of the above embodiment. ) When an abnormality occurs in the sample gas sampling section due to deterioration of the gas sample, the occurrence and extent of the abnormality can be reliably and quantitatively grasped. Therefore, for example, filters can be replaced at just the right timing. Furthermore, for example, the apparatus of the above embodiment (
When the standard gas cylinder (9) in 1) is empty, this can be known from the delay time τ extending by τ0. Therefore, for example, cylinders can be replaced accurately. In this way, this continuous gas analyzer exhibits extremely excellent effects in terms of maintenance.

Furthermore, in order to further improve the maintenance aspect of the apparatus, it is preferable to add a flow rate adjustment means that operates in conjunction with the delay detection means of the continuous gas analyzer of the present invention. Specifically, as this flow rate adjustment means, for example, in the device (1) of the above embodiment, a needle valve or a ball valve is interposed between the pump (6) and the gas switching cock, and this is electrically opened and closed. For example, there is a method in which the delay time T is controlled to be closer to To. By stabilizing the sample gas flow rate in this manner, analysis errors due to fluctuations in the sample gas flow rate can also be reduced.

Separately, a pack pro means is provided which operates in conjunction with the output means of the continuous gas analyzer of the present invention,
It is preferable that the filter can be back-blown in the event of an abnormality in the sample gas sampling section. This includes, for example, the filter (5) of the device (1) of the above embodiment and the sampling probe (
2) This is because the coarse filter built into K often becomes clogged. Particularly, the spacing of the coarse filter of the sampling probe (2) is effective in terms of maintenance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of one embodiment of the continuous gas analyzer of the present invention, and FIG. 2 is a graph showing changes in the indicated value of the analysis section to explain the delay time. (1) Continuous gas analyzer, (2) Sampling glove, (3) Drain separator means, (4) Cooler, (5) Filter, (6
)...Pump, (7)...Gas switching cock, (1)...Analysis department, (9)...Standard gas cylinder,
(2)...Control unit, τ, T...Delay time.

Claims (1)

[Claims]L The sample gas sampling section and the standard gas supply section are each connected to the analysis section via a gas switching cock, and during measurement, the sample gas is transferred from the sample gas sampling section to the analysis section (by switching the gas switching book). In a continuous gas analyzer, in which standard gas is supplied from the standard gas supply section to the analysis section during calibration, the gas switching cock is switched and after death, the switched gas is
A continuous gas analyzer characterized in that it is equipped with a delay detection means for measuring a delay time until it is detected in an analysis section, and an output means for producing an output when the delay time exceeds a predetermined value.・