RU1793348C - Method for determination of water vapors microconcentrations in gases - Google Patents

Abstract

SUMMARY OF THE INVENTION: At the same time, letting go; anal; from 1lr e; ; OTB 1 gas; through: two pairs of allelner subconnected linear measuring. chambers for the next Uermetiz brushes, vacuum and measuring the pressure difference between them, they automatically disengage the gas mixture, which are passed through: one ms; cameras, And yes, immersion in our cameras support the same. 1 ill.

Description

FIELD OF THE INVENTION The invention relates to the field of hygrometry. The predominant use area is the measurement of microconcentrated water vapor in gases / h1

A known method for determining the microcentration of water vapor in gases, comprising ;, which is included in the measurement of electrical resistance by surface resistance when passing through gas, is through an intrinsic chamber.

On the other hand, since this is the case, there is a significant effect of surface strength on the electrical resistance, which is the output value when measuring gas humidity. ; -;, A known method for the determination of microcentrations of iodine vapors in gases; including | | simultaneous transmission of the analyzed gas through two measuring chambers with their subsequent sealing, evacuation and measurement of the pressure difference between them, adopted for the Nrototype.

; Its disadvantage lies in the fact that in the presence of the sample gas vapors of various substances, the concentration of which

In the adsorbed state, the existing substance depends on the pressure, throttle stability and reliability of the predetermined MMkpPKoH erHTpaiJiHft water;

The purpose of the invention is to improve precisely. sti and reliability of measurements. ; The goal is achieved by the fact that in the method for the distribution of microconcentrated water vapor in gases. incl. passing the analyzer gas: measuring the chambers with the following: sealing, evacuating and measuring the pressure difference between them, the analyte is dried out, the gas is passed through the bottom from the chambers, and the pressure in both chambers is kept closed. ; ; . The essence of the invention is as follows. ..... -.

Unlike the prototype, the previous method allows to significantly increase the accuracy and reliability of the measurements. This is achieved by the fact that during evacuation of measuring chambers, gas evolution of various adsorbed substances (for

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and with the inclusion of ii) we will direct a jet and h it to and bdin & K and BUT: K b. Pen yrots; Et b; therefore, the pressure difference between the meters; the measuring chambers will annually correspond to the micro: krn11en urztsyh hot vapors in gases. . ,. : ,,: SUMMARY OF THE INVENTION may be 14 years old ate by eating example. Consider the option of practical realm; of the proposed method with a volume of measuring chambers of 0.0001 m3 with superfine: adsorption rate of 0.1 m3. ;,;,:; ..:; ; ..

It is known that by increasing the pressure of the gas being advised, the amount of water adsorbed by; The surface in contact with it increases substantially. So, ; experimentally installed that for; vizduha. having a dew point minus bO0 the number of species adsorbed on the balloon: t.al. at atmospheric pressure is 0.001 r / m2, and the addition of 2.5 MPa--.;: 0.01 g / m2, i.e. increases close- Te j HartHa por doc. The surface density of the adsorbed water is 0.01 g / m when it is transferred to the gas phase (after depressurization and evacuation) creates a pressure of about 10 mm Hg in the measurement chamber under consideration. Art., which in fact will be a pressure drop. In turn, such a pressure differential can be measured with sufficiently high accuracy and, therefore, with a sufficiently high accuracy and reliability to measure the microconcentration of moisture in the analyzed tank. . ;;: -.; ..- v-J - - .-, .-; . A schematic diagram allowing the implementation of the proposed method is shown in the drawing. It includes valve 1, moisture absorber 2, for example an activated alumina cylinder, moisture absorber simulator 3, double-acting electropneumatic valves 4, 5, measuring.;., Chambers 6 7 having the same volume and adsorption surfaces, made

- for example, from steel steel, differential pressure gauge 8, pressure gauge-9, valve .10 and vacuum

tank 11. To determine the degree of vaporization in a gas, open

valves 1i 10 and electrically pneumatic valves

double action 4, 5 for passing the analyzed gas; increased pressure is created in the measuring chambers 6, 7, in crtors x, for example 10 MPa, controlled by

. to the pressure gauge 9. The analyzed gas, the passage through the moisture absorber 2 is almost completely dried out. Therefore, the substances contained in the Sample gas, with the exception of water vapor, are adsorbed in the measuring chamber B, and all substances, including water vapor, are adsorbed in the measuring chamber 7. A moisture absorber simulator 3 is used to create identical gas flows. :: / i ::

/ ;;; С Л1;: Л:; - Н:; l-; : -:; After reaching the equilibrium state between the analyzed gas and the substances adsorbed in the measuring chambers b, 7, the pressure of the analyzed gas is released to atmospheric pressure abruptly (by: closing valve 1 with valve 10 open). Then valve 1.0 is closed and at the same time with the help of double-acting electro-pneumatic valves 4, 5 k

vacuum chambers .11 are connected to measuring chambers b, 7, which, after creating the necessary vacuum in it, is turned off again, which entails a change in the pressure drop. This difference with known parameters of the analyzed gas uniquely characterizes the microconcentration of water vapor. The proposed method can be implemented with one measuring chamber (with one stream

analyzed gas). For this1 it is necessary and sufficient to first measure the pressure of adsorbed substances without water vapor, and then with water vapor (with the moisture absorber 2 turned off).

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Formula of the invention

A method for determining microconcentrations of water vapor in gases, comprising simultaneously passing the analyzed pelvis through two measuring chambers followed by their sealing, evacuation and measuring the pressure difference between them, characterized in that, in order to increase accuracy and reliability, the analyzed gas is dried passed through one of the chambers, and the pressures in both chambers are kept the same.