SU1408344A1 - Method of gas composition analysis - Google Patents

Abstract

The invention relates to a measurement technique and can be applied for gas composition analysis. The goal of improving the accuracy of analysis of the components of the gas mixture The method involves the absorption of components by passing a sample of gas through absorption vessels filled with solutions — selectively acting only on one of the components of the gas mixture, and measuring a parameter at each of the outlets of the absorption vessels. The mixture of gases is diluted with a neutral gas and simultaneously calibrated one of the components, after which the mixture is fed to the inlets of the absorption vessels and according to the magnitude of the change of the calibrated component at the outlet of the absorption vessels, the concentration of the other components is judged. 1 yl. with with

Description

0 (CA IJ2 4

The invention relates to a measuring technique and can be used for continuous analysis of the composition of gases in multicomponent mixtures formed as a result of technological processes in the chemical, metallurgical and other industries, as such.

I The purpose of the invention is to improve the measurement accuracy of the components of the gas | mixture.

As a result of the constancy of the concentration of the component being calibrated at the inputs of the absorption vessels, a decrease in the dynamic error arising due to the mismatch of the amplitude and frequency spectra of concentrations, and consequently, the signal emf at the inputs and outputs of the absorption vessels due to gas inertia, is achieved. Using the concentration of one of the components as a measured parameter improves the accuracy of the analysis of the component gas mixture due to the fact that the change in temperature and pressure of the gas sample produces a proportional effect on all the components of the mixture and, in

jTOM number and the gas whose concentration is a measurable parameter,

I The drawing shows the device

| for the implementation of the method of analyzing the state of gases.

; The device contains absorbing

vessels 1 - 3, connected by gas, line 4 in the form of a comb with a booster 5 of the gas sample flow, calibrator 6 is installed on the input side of the absorption vessels 1 - 3 and includes meter 7 of the gas mixture to be calibrated, converter 8 of the signal, unit 9 of the concentration of the calibrated component, the control unit 10 for supplying neutral gas to the displacement chamber 11 and the adjustable valve 12. The displacement chamber 11 is connected to the gas outlet 13, and through the adjustable valve 12 to the neutral gas cylinder 14. At the outputs of the absorption vessels 1 - 3 installed meters 15 17 the concentration of the calibrated component of the gas mixture. The outputs of the meters 15 - 17 through you; 4-disconnect device 18 are connected to the inputs of the multipoint recorder 19. On the gas line 4, valves 20 - 23 are installed to adjust the

0

5 0 5

0

five

d j the stroke of the gas sample. As the meter 7, 15-17 of the component being calibrated, for example, a galvanic cell on a solid electrolyte with oxygen conductivity can be used.

The method is carried out as follows.

The analyzed gas mixture is withdrawn from the gas outlet 13 by a flow rate stimulator 5 and sent via the gas line 4 to the displacement chamber 11 and further to the absorption: vessels 1 to 3. In addition to the analyzed gas, neutral gas is supplied to the displacement chamber 11 from the cylinder 14, where diluted the gas mixture and calibrating one of the components using the calibrator 6. To do this, set the concentration of the component to be calibrated on the setting device 9, and then adjust the unit 10, calculate The sliding device 18 and the recorder 19 are in operation.

If the signals of the setpoint 9 and the meter 7 of the component to be calibrated are not matched by the control unit 10, the control valve 12, will act on it. adjusts the specified concentration of the component being calibrated with its actual value by injecting the required amount of neutral gas. Calibrated in this way and evenly distributed by valves 20-23, the gas mixture flows to all the inlets of the absorption vessels 1 - 3.

Passing through absorbents, the gas mixture loses those gas components that are absorbed during chemical and physical interaction with the absorbent, resulting in a change in the concentration of the component being calibrated. Changes in the concentration of the calibrated component in the form of signals taken from the meters 15-17 are fed to the computing device 18, where the signal from the meter 7 also arrives on the concentration of the calibrated component before diluting the gas mixture. By the formula

IT 0.

bum

 / E

about"

where U- is the value of the emf corresponding to the concentration of the analyzed component of the gas mixture, 8bl) f,

, 5MD

0,

SI (, 2, .., n measured components), mV; EMF of the i-th galvanic cell at the outlet of the absorption vessel, mV;

EMF corresponding to a given concentration of the component being calibrated, mV; Method of analyzing the composition of gases, including the EMF corresponding to the concentration of the components when the calibrated component is passed, passing the gas sample through the absorbed gas components and increasing the service life of the absorption solutions by deeply diluting the gas sample with neutral gas.

Claims (1)

Invention Formula A method for analyzing the composition of gases, including the absorption of components by passing a gas sample through the gas components that are absorbed, and to increase the service life of the absorption solutions by deeply diluting the sample gas with a neutral gas. Invention Formula that before the dilution operation, mV; R is the dilution ratio of the gas mixture, the computing device 18 calculates the value (vol.%) Of the absorbed gas component and outputs it to the multipoint recorder 14 as signals. Calibrator 6 for more stable and accurate calibration. Can contain several stabilizing circuits (not shown) . Thus, the proposed method allows to increase the accuracy of gas analysis and, in addition, makes it possible to expand the number of test vessels filled with solutions selectively acting only on one of the components of the gas mixture, and the parameter measurement at each and three outputs of the absorption vessels differs in that that, in order to improve the measurement accuracy of the components of the gas mixture, the gas mixture to be analyzed is diluted with a neutral gas and simultaneously calibrated one of the components, after which the prepared admixture is supplied simultaneously to all the inputs of the absorption vessel and the amount of change otka- librovannogo component at the outlet of the absorption vessels determined value of the concentration of other components. rh four/ 0-w-i /four 2f