SU55163A1 - Instrument for determining the degree of contact of gases - Google Patents

Description

The degree of gas contact in sulfuric acid production, as is known, is determined by analyzing the gases before and after on-contact.

The use of physical gas analyzers to control the operation of contact devices at contact sulfuric acid plants is made difficult by the formation of gases in the gases when they are cooled before entering the measuring chamber SOa, which spoils the gas analyzer, and distorts its readings. Separating SO., From SO, is a difficult task and necessitates the use of a number of additional devices (absorption of SOg by solid KC1 at 0 ° or sulfuric acid, etc.), which require close observation and significantly increase the gas analyzer lag.

The proposed device for determining the degree of gas contacting has the peculiarity that two gas analyzers, for example, of the type Renarex, intended for gas analysis before and after contacting, are equipped with a common employee for directly indicating the percentage of contact with a nomographic scale,

where the gas analyzers intersect.

When the heber gas analyzer is heated together with the analyzed gas to a temperature above the boiling point of the F30, in particular, above the temperature of 44 ° (for example, 50-60 °), the fog of SOs disappears; SOa goes into a gaseous state and the heber of the gas analyzer can accurately measure the physical properties of a mixture containing SOj and SOs together. The difference in the physical properties of SOo and SOg (specific gravity, thermal conductivity, viscosity, etc.) is judged by two indications gas analyzers about the percentage of contact with a minimum delay, which makes it possible to timely notice the problems in the contact apparatus and eliminate them.

Heber is heated by placing heber and gas supply tubes in a thermostat (air, etc.) with a temperature automatically maintained by one of the known methods at a certain level above 44 °.

Further description is given in relation to gas analyzers based on the principle of measuring the specific gravity of a gas, for example, of the type Renarex.

The specific gravity of the gas in the monitored apparatus is measured before and after contact at a temperature of 50. At this temperature, the specific gravity of 8zo2 is 2.30 and the specific gravity of Ssos is 2.76. The specific gravity of the gas mixture D relative to air depends on the content of SO., And SOj.

D, 013 50., +0.0176 ЗОз. (one)

If the pre-contact gas does not contain 5Oz, then its specific weight depends only on the content of SOj.

D 14-0,013 SO / ... (2)

After contact, the gas contains both SOo and SOs and its specific gravity, according to equation (1), depends on the content of both these components.

D 1-4-0,013 SO / + 0,0176 SO /. (3)

From the SO oxidation reaction formula, it can be seen that the reaction proceeds with a decrease in volume.

2SO2-j-O2 2SO3 ... (4)

The volume reduction is half the volume of SOa formed. If 100 volumes of gas are contacted, then after contact, the following is obtained:

100 3 volumes of gas. On the other hand, from equation (4) it follows that

SO2 + SOs const SO /. .(five)

If symbols with no indices denote the actual volumes of gases after contacting 100 volumes of the initial mixture, and SOs are denoted by X, then

, . . (6)

100

Substituting in (6) the value of SO-i

from (5):

100

(SO / -X). . (7)

SO, mO-- | Substituting in (7) the value of SO / from (2):

SO JO / DG and .04

 ,; g ("

100 -. Similarly

100

X. . .(9)

100-Substituting the values SO / and SO / from (8) and (9) into equation (3):

100 M - 1,

A 1 +0.013

r i nni. - G

100- 0 ° 13 + 0,0176

IV100- + corresponding to their transform

100 (D-E)

. . . .(ten)

X

 -0.04

The contact percentage z is determined from the following relationship:

100j

(AND)

Substituting in (I) the values, and SOa from (10) and (2) and, simplifying, we getM:

260 (D - D-). .

(, 08) (d -1): EXAMPLE.

SO / 8%; A 1 + 0.013.8 1.104. D 1,120; g; SO /; SO

260 (1,120-1,104)

(1,120-0.08) (1,104-1) 260-0,016

 38.5%.

1,04-0,104

In this case, the gas analysis after contacting will be the following:

 100 (1,120-1,104) 1, b ..., 0 1,120 „, 0,52 -.

-20.04

SO .г 100 (1.104-1 „OQSW i - пй i ППТч о, ио -

3.08 0.013

100--.

 100 / 0.104 op8

 98.46 U.eis -.usj - 1.01.4.92 4.97%

S0,

100-j

 1.01-3.08 3.11%.

Thus, by measuring directly the specific gravity of the gas D and D before and after contacting, it is possible to determine the percentage of contact from the corresponding nomogram. The nomogram is composed of equation (12).

Since the gas mixture entering the contact apparatus is characterized by a comparative constancy of the composition, the absence of moisture and its temperature is artificially maintained at the same level, one should expect increased measurement accuracy.

The drawing shows a schematic view of the proposed device for determining the degree of contact of gases.

This device consists of two gas analyzers, for example, of the Renarex type, mounted next to a common thermostat so that their arrows 5 intersect each other on a nomographic scale 5 common to both gas analyzers, which, as is well known, allows us to automatically find the function of two variables, t. E. .. (L, D).

Each of the gas analyzers of the device has an electric motor 4, an air impeller 2 and a gas-impeller /. In one of the gas analyzers through the tube 6 enters the gas to the contact apparatus, and the other through the tube 7 after the contact apparatus. From both gas analyzers, the gas exits through tube 8.

In order to avoid the influence of humidity in the air chamber, air that was previously passed through a desiccant (above sulfuric acid, etc.) is taken in.

The measuring chamber, the gas impellers and the fan are made of an acid resistant material.

The gas and air chambers of the gas analyzer are placed in a thermostat where the temperature is maintained above 44 ° (for example 50 °).

The subject matter of the invention.

Claims (2)

1. An instrument for determining the degree of gas contacting by determining the content of the component to be contacted in a gas before and after contacting, characterized in that, for analysis before and after contacting, two gas analyzers, for example, of the type Renarex, are equipped with a common measuring device for directly indicating the percentage of contact, where the gas analyzers intersect. 2. In the device according to claim 1, use a device for cooling or heating the gases to be analyzed in a gas analyzer. E to author's certificate of V. № 55168 M. Mukhachev