SU914996A1 - Electrochemical device for measuring hydrogen sulphide concentration - Google Patents

Description

The invention relates to devices for determining the concentration of harmful solid matter in gases, and can be used to automatically determine the concentration of hydrogen sulfide in gas purification processes in neftepereraba- ⁵ TYVA, gas and other industries.

There are known devices for determining the hydrogen sulfide concentration, the principle of operation of which is based on photocolometric, conductometric, coulometric, and other methods [1].

The closest to the present invention is an electrochemical device for measuring the concentration of hydrogen sulfide, containing an absorber connected to a series measurement chamber, inside which is placed a sulfide selective electrode, a reference chamber and a drain element [2].

However, the use of an ion-selective electrode in the form of a trap disk coated with a very porous, hydrophilic 2

This material leads to a significant deterioration in the dynamic characteristics of the device due to the formation of a stagnant zone and a slow exchange of electrolyte near the sensitive surface of the measuring ion-selective electrode.

In addition, the discharge element of the spent solution is a glass rod through which electrolyte flows freely, while the level in the area of the measuring and comparative electrodes fluctuates within 1-2 mm, which leads to a change in the static · (meter reading) and dynamic characteristics (constant time) and · makes it difficult to use the device in automatic control systems.

The aim of the invention is to increase the speed and accuracy of measurements.

The goal is achieved by

what's in the device for measuring concentrations> 9149ί

hydrogen sulfide traction, containing a hydrogen sulfide absorber connected to a measurement chamber, which is successively located, inside which is placed a sulfide selective electrode, a comparison chamber and a drain element, the sensitive part of the sulfide selective electrode is made in the form of a cone of rotation with an angle of 110-130 ° and installed in the center of the measurement chamber 10

cone down.

An increase in the apex angle above 130 ° leads to an excessive increase in the volume of the electrode in the measurement chamber, which reduces the degree of its washing off with the working solution and promotes the formation of stagnant zones.

A decrease in the apex angle below 110 ° leads to an excessive increase in the volume of the solution in the chamber from ^ m of measurement, which impairs the dynamic characteristics of the device.

The choice of the angle at the top of 110-130 ° contributes to the almost complete absence of stagnant zones and the intensive exchange of the working solution in the zone of the measuring electrode.

The drawing shows the proposed device.

The device consists of choke 1, connected to intermediate tank 2, where the temperature of the working solution is stabilized, absorber 3, made in the form of a reaction coil with choke 4 for supplying the analyzed gas ₃₅ , choke 5 for outputting hydrogen sulfide, measurement chamber 6 connected to chamber 7 comparisons. Comparative chamber 7 is connected by fitting 8 with loop-shaped inlet 9, which is connected to cylindrical tank 10, with an additional channel 11 located on the side wall of the container and outlet fitting 12 connected to a drainage system (not shown). The device is equipped with a separation chamber 13 located between the reaction coil 3 and the measurement chamber 6.

The device works as follows.

The working solution is fed through the nozzle 1 into the intermediate tank 2 and then into the reaction coil 3. Through the nozzle 4 into the coil 3 enters the analysis 4

Test gas »In the reaction coil, complete absorption of hydrogen sulfide from the analyzed mixture occurs. Hydrogen sulfide-free gas is removed from the device through fitting 5, and the working solution absorbed hydrogen sulfide enters the measurement chamber 6, in which the sensitive part of the ion-selective electrode is placed. The auxiliary electrode is located in the comparison chamber 7, located below the measurement chamber 6.

Through the fitting 8, the spent solution enters the loop-shaped inlet 9, which is connected with a cylindrical container 10, which is connected by an additional channel 11c to the atmosphere. The output of the spent solution from the tank through the nozzle 12.

The electromotive force developed by a pair of electrodes due to a change in the ion concentration in the working solution is formed by an industrial converter into a unified output signal.

The proposed device allows to increase the measurement accuracy and speed of the device.

Claims (1)

Claim An electrochemical device for measuring the concentration of hydrogen sulfide containing a hydrogen sulfide absorber connected to a measuring chamber arranged in series, inside which a sulfide selective electrode is placed, a reference chamber and a drain element, characterized in that, in order to improve performance and accuracy of measurements, the sensitive part of the sulfide selective electrode is made a cone of rotation with an angle of 110-130 ° at the top and mounted in the center of the measuring chamber with a cone downward.