SU40029A1 - The method of analysis of gas mixtures - Google Patents

Description

Being based on a comparison of the thermal conductivity of the test gas and air, all electrical gas analyzers, without exception, are extremely inaccurate and coarse instruments. This follows from the fact that in reality there is not one COg flue gas under investigation, but a mixture of gases

СЗ, Нз, СО, Оа, ЗОг, СН., Etc.

Under certain conditions, the thermal conductivity of this mixture can differ so much from the thermal conductivity of a single CO that the analysis of gases becomes meaningless.

The presence of significant impurities (hydrogen, sulfur dioxide and water vapor) can lead to the fact that instead of real, for example, 12% CO2, the apparatus will show COj or 16-170 / 0 CO2.

The proposed method of analyzing gas mixtures completely excludes the possibility of obtaining any errors of the specified type and consists in the fact that, in order to eliminate the influence of impurities on the analysis result, the entire mixture is passed through the absorbing one of the components according to (399)

absorber and compare the resistances of the conductors, one of which is washed by the whole mixture of gases, and the other without the component to be detected.

The application of the proposed method makes it possible to analyze any component of a gas in a mixture of gases and can be widely used for the analysis of toxic substances contained in air.

In FIG. depicts the electrical circuit of the gas analyzer (transmitter) for the implementation of the proposed method; FIG. 2-diagram of the gas analyzer.

The proposed method for analyzing gas mixtures is as follows. For the analysis of any gas in a mixture of gases, the thermal conductivities of the entire mixture of gases and all impurities, except for the analyzed gas, are somehow absorbed.

Thus, for the analysis of CO from a mixture:

Soz, Na, CO, SO ,, Oh, CH, etc.

it is necessary to compare with one another all this mixture and all impurities without SOCH, i.e.

H, CO, SOo, Oa, CH, etc.

COg is absorbed by some chemical absorber.

The electrical circuit of the gas analyzer for implementing the method of FIG. Figure 1 is a conventional Wheatstone bridge, in which two opposite arms, made of thin wire, are gassed.

One arm, the 5-meter channel, was washed by the whole mixture of gases, and the other 3-compensation channel — only impurities to the gas to be analyzed.

When the shoulders are washed with the same gas mixtures, the bridge is in equilibrium, and the arrow of the galvanometer indicates „zero.

If, however, only impurities to the analyzed gas are passed through the compensation channel, having previously absorbed the analyzed gas, then, due to the different thermal conductivities of the gases in the channels, one arm of the bridge will have more resistance than the other, the bridge will become out of balance, and the galvanometer will indicate the corresponding percentage of the gas being analyzed.

All of the gas (Fig. 2) coming from boron 1 splits into two parts. One part passes through the absorber of the analyzed gas 2, then through the compensation chamber 3 to the outlet. The other part goes through the water 4,

then measuring chamber 5 and also to the exit. Thereafter, once again connected, the gases are directed to the pump in a common flow.

The subject matter of the invention.

The method of analyzing gas mixtures, characterized in that, in order to eliminate the effect of impurities on the result of the analysis, the entire mixture is passed through the absorbing one of the components of the absorber and the resistances of the conductors are compared, of which one is washed by the entire mixture of gases and the other without the component to be determined.