JPS588734B2 - Sample gas sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sample gas sampling device, and more particularly, the present invention relates to a sample gas sampling device, and more particularly, to a sample gas sampling device, in which a clean sample gas from which dust has been removed is mixed into cleaning water supplied to a nozzle portion of a cleaning ejector that sucks a sample gas. The present invention relates to a sample gas sampling device that balances the concentrations of dissolved gas components and sample gas components.

In order to investigate the components of exhaust gas, when the collected exhaust gas is introduced directly into a gas analyzer, dust, mist,
Accurate analysis results cannot be obtained because the analyzer is contaminated by moisture or other components that interfere with the measured components are mixed in.

Therefore, normally, the exhaust gas sampled as a sample gas is subjected to necessary pretreatment using an exhaust gas sampling device before being introduced into the gas analyzer.

Conventionally, this type of exhaust gas sampling device has used a wire mesh filter or a mouthpiece filter to remove dust, but with this method, maintenance such as filter cleaning and replacement is troublesome, and If water-soluble corrosive components were present, they had to be removed by other means.

Furthermore, there is another method that uses an ejector in which cleaning water is supplied to the nozzle section to suck in the sample gas, and uses the cleaning water to remove dust and water-soluble corrosive components from the exhaust gas. In the case of 02 analysis, a high analysis value was displayed due to the addition of residual oxygen in the wash water, and in the case of C02 analysis, a low analysis value was displayed due to the dissolution of CO2 in the wash water. .

Therefore, a method has recently been attempted in which the cleaning water is circulated to balance the concentration of the cleaning water and the sample gas.

However, in this case, as the cleaning water gradually becomes contaminated with dust, sulfur oxides (S02, SO2) in the exhaust gas
3 etc.) dissolve in the cleaning water, making the cleaning water acidic and increasing its corrosivity. Therefore, equipment such as cleaning tanks, cleaning ejectors, conduits, water gas separators, water pumps, etc. must be constructed of corrosion-resistant materials. There was a problem in that this resulted in high equipment costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the drawbacks of the conventional apparatus described above and to provide an inexpensive sample gas that can introduce clean sample gas from which dust, mist, and water-soluble corrosive components have been removed into a gas analyzer. An object of the present invention is to provide a gas sampling device.

In order to achieve the above-mentioned object, the device of the present invention is constructed by connecting an exhaust gas sampling device, a cleaning water tank, and a cleaning ejector in series, and the cleaning ejector is connected to the exhaust gas sampling device. A cleaning water supply system line, an analysis sample gas supply system line configured by connecting a water gas separator and a gas analyzer in series, and in which the water gas separator is connected to the cleaning ejector, and a return pipe. and an equilibrium sample gas supply line connecting the analysis sample gas supply line to the wash water tank via the line.

An embodiment of the sample gas sampling device according to the present invention will be described above with reference to the drawings.

The figure shows the entire system of the sample gas sampling device according to the present invention in a block diagram. It is composed of C.

The cleaning water supply system A includes a cleaning water tank 1 and a water pump 2.
and a cleaning ejector 3 are connected in series, and new cleaning water is supplied into the cleaning water tank 1 through a water supply pipe 4.

Further, reference numeral 5 in the figure indicates an exhaust gas sampler, and the exhaust gas as a sample gas sampled by the sampler 5 is sucked into the cleaning ejector 3 and forcibly mixed with cleaning water.

The analysis sample gas supply line B is constructed by sequentially connecting a water gas separator 1, a filter 8, a dehumidifier 9, and a gas analyzer 10 in series on a pipe line 6.

The water gas separator 1 separates sample gas and cleaning water within the vessel, and the cleaning water is discharged from a drain pipe 11 to a drainage seal pot (not shown).

Further, the water removed by the filter 8 and the dehumidifier 9 is discharged to the drain pot 12.

On the other hand, the equilibrium sample gas supply line C has a return line 13 led out from the gas analyzer 10 and led to the washing water tank 1, and a gas pump 14 is installed on this line 13. There is.

A bypass pipe line 15 is connected in a detour manner before and after the gas analyzer 10, and furthermore, a discharge pipe line 16 branches off from the bypass pipe line 15.

In addition, the code|symbol 11 has shown the flow meter incorporated in each pipe path.

In the embodiment configured in this way, the exhaust gas as the sample gas collected by the collector 5 is transferred to the cleaning tank 1.
The water is then mixed with the washing water supplied to the nozzle of the washing ejector 3 through the water pump 2, and is supplied to the water gas separator 1 through the pipe line 6.

The cleaning water and the sample gas are separated in the water gas separator γ, and the cleaning water is drained from the drain pipe 11.
Part of the sample gas that has been cleaned and dust-removed is sent to a gas analyzer 10 through a filter 8 and a dehumidifier 9, where the components of the sample gas are analyzed.

On the other hand, most of the purified sample gas is sent out by the gas pump 14 through the bypass line 15 and blown into the supply water in the wash water tank 1, so that the water and the sample gas are stirred and brought into contact.

As a result, the dissolved air contained in the supplied water in the wash water tank 1 is removed, and the concentrations of the m-resolved gas component and the sample gas component in the water are brought to an equilibrium state.

Note that in order to maintain the pressure of the sample gas in the gas analyzer 10 at atmospheric pressure, it is desirable to increase the flow rate of the clean sample gas flowing into the bypass pipe 15.

As is clear from the above description, according to the present invention, a sample gas from which dust, mist, water-permeable corrosive components, etc. have been removed is supplied into a cleaning water tank that receives new cleaning water supply. Fresh water with concentrations of dissolved gas components and sample gas components in the water equilibrated was supplied to the nozzle of the cleaning ejector and brought into contact with the sample gas, thereby preventing the release of dissolved oxygen from the cleaning water and the ff It is possible to reduce measurement errors in analysis.

Furthermore, since there is no need to consider the corrosion resistance of the equipment that generates and distributes the cleaning water, the apparatus can be constructed at low cost.

Note that the gas analyzer 10 is not provided with the bypass line 15.
It is also possible to supply only the exhaust gas into the wash water tank 1.

[Brief explanation of the drawing]

The figure is a system diagram showing an embodiment of the sample gas sampling device according to the present invention. A...Washing water supply system line, B...Analysis sample gas supply system line, C...Equilibrium sample gas supply system line, 1...Washing water tank, 2...Water pump, 3.・・Cleaning ejector, 5・
... Sampler, 7... Water gas separator, 10... Gas analyzer, 13... Return pipe, 14... Gas pump, 1
5...Bypass pipeline.

Claims (1)

[Claims] 1. A cleaning water supply line configured by connecting an exhaust gas sampling device, a cleaning water tank, and a cleaning ejector in series, and in which the cleaning ejector is connected to the exhaust gas sampling device, a water gas separator, and a gas analyzer. The water gas separator is configured to be connected in series and has an analysis sample gas supply line connected to the cleaning ejector, and a return pipe, and the analysis sample gas supply system is connected through this pipe. an equilibrium sample gas supply system line connecting the line to the wash water tank.