DE2347330A1 - Extractor of unpolluted gas samples - from low pressure or overpressure lines or instruments has bag to hold samples - Google Patents

Abstract

A diffusion-proof sampling bag is placed in a pressure-proof or vacuum-proof container made of transparent material. The sampling bag is connected by means of a pipe socket to the valve in the lid of the container and thus to the gas extraction source. The sampling bag and then the container surrounding the sampling bag are evacuated. The sampling bag is now connected to the extraction source. The gas sample is allowed to flow into the sampling bag after which air is let into the container. After the gas sample has been sealed, the sampling bag is removed from the container.

Description

Ri) TGERSVERKI Aktiengesellschaft

Frankfurt am Hain

Pat-577-R

Patent application

Method and device for the removal of contamination free from gas samples from tubes or parts of the apparatus which carry negative or positive pressure

Daa efforts of Induatrie, pollutant emissions through to reduce or avoid more suitable equipment and / or influence on procedures, depending on the sample " acquisition process and analytics to identify the Schadatoffa and its concentration measurement.

From the VDI-Konisaion "Keeping the air clean ** were various methods for sampling and analysis developed and described

For example, the gases to be analyzed are sucked in via washing « Bottles with suitable adsorbents or through adsorption tubes · The substances to be analyzed Nusson then distilled off the extractants or removed from the adsorbents by heating.

This method can also be used for sampling Even when distilling off or driving out of the substances to be analyzed uncontrollable errors occur, because aelbat with deep-frozen extraction ««

-2-

50 9 815/0515

■ The low-boiling pollutants can only be averaged. ium tail catch · an · exact «bestiaaaaaung the actual Pollutant levels is practically impossible.

Gas-containing samples can also be used with the help of a scarf free Meabranpuape can be pumped directly from the gas stream to be analyzed and stored in gas cells, indea sian the Gassiaus old dea su checking gas enough rinsed for a long time

Instead of the pump, aan occasionally uses evacuated gas housings but test sewing. In both cases except via a nitrogen / oxygen content determination Check whether there was still any remaining air or leaks ia Yakuuasystea. In the Use of gas outside also a pressure equalization with sealing liquids carried out before the measurement that during the measurement sur Voluaan displacement be used.

With this method, measurement errors can occur depending on the barrier fluid and Gaszusaanensetxung due to mutual solubility bsw. Absorption of the gas in the liquid appear. The partial pressure of the sealing liquid can also lead to incorrect analyzes.

The procedures described have sueaaaenfassend the Disadvantages of only a small test space, which only allows Moaentanxus to analyze and many errors due to the influence of foaming agents from Puapen and tracks, extraction and Barrier fluids used for sampling and Analysis are required.

-3-

509815/051 5

All these difficulties on the metrological side contrasts with the requirement of the trade supervisory authorities for low concentrations of pollutants in exhaust gases. she can only with suitable devices and sampling procedures are met.

It is therefore the task of a sampling method and a sampling device that a sampler experience allowed to develop that largely avoids these disruptive measuring influences described.

The method developed according to the invention for taking gaseous, impurity-free gas samples from or pressurized lines or parts of the apparatus is characterized in that one pressurized or a vacuum-tight container made of transparent material Diffusion-tight sample bag is arranged so that it can pass through a pipe socket with a valve in the lid of the container can be partly connected with the gas extraction that you then evacuate the sample bag and then the surrounding space, the sample bag to the removal point connects, lets the gas sample flow into the sample bag, ventilates the surrounding space and closes it the sample bag is removed from the container after the gas sample. > '

The device for carrying out the method is characterized by a pressure-tight or vacuum-tight one Container made of transparent material (l), lockable by means of a quick-release fastener with a cover (2) with a ventilation nozzle with a valve (%), a manometer and a connecting piece with valve (5), to which a hose clamp is connected diffusion-tight sample bag (3) is attached replaceably.

509815/05 15

In principle, the sample bag can also be filled with a membrane pump, but replaces the one according to the invention Device, the pump in its mode of operation with the advantage that the bag acting as a membrane is exchangeable is · In addition, any size of the gas sample bag has the advantage, depending on the setting of the filling speed Average samples that have been flawless over a long period of time to be able to infer what is used for the most diverse analyzes such as determination of the calorific value, density and gas chromatography gram sufficient material is available

The device according to the invention consists of an exchangeable one Diffusion-tight bag (3) into which the gas sample is sucked or pressed · It is on Lid (2) of an evacuable container (l) attached with hose clamps. Lid and gas bag will be connected to the lower part of the container by means of a quick release fastener. There is a valve in the lid for the evacuation and ventilation of the container (4), a valve for the evacuation and filling of the gas sample bag (5) and a pressure gauge (6) to display the pressure built-in·

For sampling, for example, the diffusion-tight sample bag is first placed on the for it with a hose clamp provided nozzles in the lid of the container and pushed the container base over and with quick release clamps closed · Then first the sample bag and then the container is evacuated and the valves closed

The device prepared in this way is closed via a Drip catcher to separate the area of entrained liquid

-5-

509815/0515

keit droplets with the nozzle (5) to the apparatus dl from which the gas sample to be analyzed is to be taken. It is advisable to use a hose with a narrow opening in order to keep the non-evacuated volume with foreign gas small. In the device according to the invention, however, the volume of test gas extracted is so large that the influencing variable of this dead space is less than 1 % .

By opening the valve (5) the sample bag is filled with the gas to be analyzed. This filling can take place over a longer period of time as desired in order to get the best possible average sample.

After filling, the inflow valve is closed and the hose connection to the apparatus part is released.

The device is then ventilated via valve 4, whereby the pressure equalization can be followed on the manometer *

After removing the SchnellschjjLußklenaen the Lid with sample bag pulled out of the container, the bag closed with a hose clamp, from Nozzle disconnected and labeled with the appropriate data such as the location and time for the analysis provided, while by connecting another sample bag the device for the next measurement can be prepared.

For the analysis, the gas sampling bag is used depending on the analysis method connected directly to the analysis equipment. The gas can be released by rolling up the bag or lightly Pressure on the bag or, if the device according to the invention is to be used, by lightly

-6-

509815/0515

He keeps excess pressure in the container from the bag into the analysis area be pressed. Depending on the measuring method, there is also the option of using the gas * · Β. with a gas chromatograph, which is equipped with a gas sample inlet valve and calibration loop, via this gas loop with a small one Suck the pump into the device xu, the pump being connected behind the gas chromatograph and through leakage or lubricants can no longer influence the analysis

The use of the device according to the invention thus enables the sampling and analysis of gaseous substances Samples without the use of barrier fluids but emptying the gas sample container

509815/0515

Claims (1)

Claims l. \ Procedure for removing contaminants Ga «samples from lines carrying negative or positive pressure or parts of apparatus, characterized in that nan in a pressure or · vacuumf th container made of transparent ·! Material Arranges the diffusion-tight sample bag so that it sits through a pipe socket Valve in the lid of the container ■ it can be connected to the gas extraction point so that «then the sample bag and then the him surrounding room evacuated, the sample bag connected to the extraction parts, the gas sample in the sample The bag is allowed to flow in, the surrounding space is ventilated and, after the gas samples have been closed, the sample bag takes from the container. 2 · Device for carrying out the method according to claim 1, characterized by a pressure- or vacuum-tight container made of transparent material (1), closable by means of a quick-release fastener with a lid (2) with a loading and a vent ·· connection with valve (4), «in manometer and a connection piece with valve (5) "on which by means of a hose clamp ·" in a diffusion-tight manner The test bag (3) is attached in an exchangeable manner 509815/0515 Blank page