Method and device for creating a continuous carrier gas/steam vapour flow

Abstract

The invention relates to a method for creating a continuous carrier gas/steam vapour flow. The method comprises the step of providing a metered first carrier gas stream and wherein the portion of steam in the carrier gas/steam mixed gas stream needs to be set to zero as the carrier gas/steam mixed gas stream; providing a metered second carrier gas stream, providing a metered, vapor-saturated, carrier gas/steam mixed gas stream, mixing both to provide a first gas-like mixed gas stream, and setting the steam share in the carrier gas/steam mixed gas stream to be set Relatively low as a carrier gas/steam mixture; providing metered liquid stream and feeding it to an evaporation/mixing device to evaporate the liquid and mix with the first gas-like mixed gas stream to provide a second gas-like mixed gas stream, and the steam fraction in the carrier gas/steam mixed gas stream needs to be set relatively high as a carrier gas/steam mixed gas stream.

Description

technical field [0001] The invention relates to a method and a device for generating a continuous carrier gas / steam mixed gas flow comprising steam with adjustable proportions of (on the one hand) carrier gas and (on the other hand) liquid. Background technique [0002] Such methods and devices are known from the prior art and can be used, in particular, for the study of material properties under predetermined environmental conditions and, if necessary, variable predetermined environmental conditions. An example of this is the study of the adsorption capacity, (eg thermal) linear expansion, rigidity, crystal structure etc. of a material sample arranged in a sample chamber through which a carrier gas / steam mixture flows. [0003] The carrier gas may especially be an inert gas (eg nitrogen, helium, argon etc. or a mixture of noble gases). The vaporous component or liquid, the vapor of which is contained in the carrier gas / steam mixture, is mostly water, but mixtures including...

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Problems solved by technology

Various commercially available mass flow measuring instruments are thus excluded or expensive special solutions must be selected for high medium temperatures

[0010] In the direct evaporation method, the accuracy in reaching the target concentration of the vapor is limited by the dosing accuracy of the liquid component

Often, for example, the liquid mass flow is so small that it cannot be metered with sufficient precision ("sluggish flow") and / or cannot be evaporated uniformly

Another disadvantage of direct evaporation is the comparatively long rise time and especially the fall time of the vapor concentration (usually in the range of several minutes) when the metered liquid quantity varies between zero and a target value not equal to zero.

[0011] The method of firstly creating a stream of carrier gas saturated with vapor-like components is disadvantageous because a pure vapor atmosphere (100% vapor concentration) and almost 100% concentration will not be achieved based on the necessary participation of the carrier gas

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