JP2849340B2 - Measuring device for gas content in liquids and slurries - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring a gas content in a liquid or slurry.

[0002]

2. Description of the Related Art Conventionally, in various manufacturing processes,
Liquids and slurries are often handled (hereinafter referred to as "liquids and slurries"). However, if a fine gas is entrained in the liquids or slurries, the performance of equipment that handles the liquids and slurries is reduced or operation is difficult. It may be.

[0003] Therefore, it is necessary to accurately measure the amount of gas contained in the liquid / slurry (hereinafter referred to as "gas content"). When the mixture is diluted to a concentration of about 0.5 [wt%], mixed with an antifoaming agent and left to stand, the particle size of the fine air increases, and the air component is separated and floats. Next, the volume of the sample before the air component is separated is compared with the volume of the sample after the air component is separated, and the gas content of the sample can be measured from the volume difference.

[0004]

However, in the above-mentioned conventional method for measuring the gas content in a liquid / slurry,
When trying to measure the gas content of a fibrous slurry, a fine gas is often entangled with the fibrous material, and even if an antifoaming agent is added and both are mixed, the gas is completely separated. Therefore, the gas content in the liquid / slurry cannot be accurately measured.

Further, after mixing the sample and the antifoaming agent, it is necessary to leave the mixed solution for a long time (2 to 3 hours), so that the time until the measurement is completed is lengthened accordingly. Moreover, it is necessary to take out a sample of the liquid / slurry from the main line, which is troublesome. The present invention solves the problems of the conventional gas content measurement method in liquids and slurries, so that the gas content in liquids and slurries can be accurately measured, and the operation is not troublesome. It is an object of the present invention to provide a gas content measuring device for a liquid / slurry.

[0006]

In order to achieve the object, a gas / content measuring apparatus for a liquid / slurry according to the present invention is designed to accommodate a sample of a liquid / slurry and measure the amount of the accommodated sample. A sample tank having a section, a connection pipe connected to the main pipe line for taking a sample of liquid / slurry into the sample tank, a first opening / closing valve arranged in the connection pipe, It has an inlet pipe for supplying compressed air from a compressed air source, a second on-off valve disposed on the inlet pipe, and a pressure gauge for detecting a pressure in the sample tank.

[0007]

According to the present invention, as described above, in the gas content measuring device for a liquid / slurry, a measuring section for accommodating a sample of the liquid / slurry and measuring the amount of the accommodated sample is provided. A sample tank, a connection pipe connected to the main pipe line for taking a liquid / slurry sample into the sample tank, and a first opening / closing valve disposed in the connection pipe.

Therefore, the first on-off valve can be opened to take the liquid / slurry sample into the sample tank from the main line. Next, by closing the first on-off valve, the amount of the sample in the sample tank can be measured. Further, an inlet pipe for supplying compressed air from a compressed air source to the sample tank, a second on-off valve disposed on the inlet pipe, and a pressure gauge for detecting a pressure in the sample tank are provided. Have.

Therefore, when the second on-off valve is opened and compressed air is supplied from the compressed air source to the sample tank, the liquid / slurry in the sample tank is pressurized and the gas contained in the liquid / slurry is pressurized. Are also pressurized at the same time. Then, the pressure in the sample tank in that state is measured by the pressure gauge, and the amount of the sample is measured again.

As a result, since the change in pressure and the change in the amount of the sample can be obtained, the gas content can be measured based on the change in the pressure and the change in the amount of the sample.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram of an apparatus for measuring a gas content in a liquid / slurry according to an embodiment of the present invention. In the figure, reference numeral 11 denotes a steel sample tank in which a liquid / slurry sample whose gas content is to be measured is stored, and 12 denotes a connection pipe for taking in the sample, and the sample pipe is connected through the connection pipe 12. The tank 11 is connected to a main conduit (not shown). Reference numeral 13 denotes a first on-off valve disposed on the connection pipe 12.

The sample tank 11 has a measuring section 14 made of glass on the upper part, and the measuring section 14 is provided with a scale 15 for measurement. Therefore, the amount of the sample can be measured by reading the level of the scale 15 indicated by the surface of the sample in the measuring unit 14. An introduction pipe 20 is connected to an upper end of the sample tank 11, and the introduction pipe 20 is connected to a compressed air source and a diluent supply source (not shown) via a second on-off valve 21. Therefore, compressed air can be supplied to the sample tank 11 from the compressed air source, and diluent such as water and solvent can be supplied from the diluent supply source.

A branch pipe 22 is connected to the introduction pipe 20, and an on-off valve 25 is provided in the branch pipe 22. Therefore, the pressure in the sample tank 11 can be measured with the on-off valve 25 opened. In the gas content measuring device in the liquid / slurry having the above configuration, first,
The first on-off valve 13 is opened, and the liquid / slurry conveyed through the main pipeline is connected to the sample tank 11 via the connection pipe 12.
Is taken in as a sample. When the surface of the sample reaches the first level a in the measuring unit 14,
The first on-off valve 13 is closed.

Subsequently, the second on-off valve 21 is opened, and the diluent is supplied from the diluent supply source to the measuring unit 14 via the introduction pipe 20. When the surface of the sample reaches the second level b in the measuring unit 14, the second level
Of the on-off valve 21 is closed. Next, the second on-off valve 2
1 is opened and compressed air is introduced from the compressed air source
0 is supplied to the measuring unit 14 via the “0”. As a result, the liquid / slurry in the sample tank 11 is pressurized, and the air contained in the liquid / slurry is also pressurized. In this manner, the liquid / slurry in the sample tank 11 and the air in the liquid / slurry are pressurized, the pressure in the sample tank 11 in that state is measured by the pressure gauge 24, and the level c of the sample surface is measured read.
The gas content can be measured based on a change in pressure before and after pressurization and a change in the amount of the sample.

For example, a sample of 2000 [ml] is taken into the sample tank 11 until the level becomes a, and a diluent of 100 [ml] is supplied until the level becomes b.
Assuming that the pressure in the sample tank 11 after the supply of the compressed air is 5 [kg / cm ² G] and the level c of the sample liquid becomes 2050 [ml], according to Boyle-Charle's law, the inside of the sample is measured. It can be seen that the gas content x [ml] is x / (x-50) = 5 x = 62.5.

Accordingly, the gas content becomes (62.5 / 2000) × 100 = 3.125 [%]. Sample tank 11 depending on the temperature of the sample
Can be calibrated in advance. In addition, when considering the amount of gas dissolved in the diluent, the value of the gas content x can be corrected based on the temperature and pressure according to Henry's law.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0018]

As described above in detail, according to the present invention, in the gas content measuring device in the liquid / slurry,
A sample tank containing a liquid / slurry sample and having a measuring unit for measuring the amount of the stored sample, and a connection connected to the main pipeline for taking the liquid / slurry sample into the sample tank. It has a pipe and a first on-off valve disposed on the connection pipe.

Therefore, the sample can be taken into the sample tank by opening and closing the first on-off valve. In this case, a sample of the liquid / slurry can be taken out of the main conduit via the connecting pipe, so that the work for measurement can be simplified. An introduction pipe for supplying compressed air from a compressed air source to the sample tank; a second on-off valve disposed on the introduction pipe;
A pressure gauge for detecting a pressure in the sample tank.

In this case, when the second on-off valve is opened and compressed air is supplied from the compressed air source to the sample tank, the liquid / slurry in the sample tank is pressurized and contained in the liquid / slurry. Since the air is also pressurized at the same time, the gas content can be measured based on the change in the pressure and the change in the amount of the sample at this time. Therefore, the liquid
Even if gas is entangled in the slurry, the gas content in the liquid / slurry can be accurately measured. Further, since it is not necessary to leave the sample for a long time, the time until the measurement is completed is shortened, and the work for the measurement is not troublesome.

[Brief description of the drawings]

FIG. 1 is a schematic view of a gas content measuring device in a liquid / slurry according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Sample tank 12 Connection pipe 13 1st on-off valve 14 Measuring part 20 Introducing pipe 21 2nd on-off valve 24 Pressure gauge

Claims (1)

(57) [Claims] 1. A (a) sample tank containing a liquid / slurry sample and provided with a measuring unit for measuring the amount of the stored sample, and (b) a liquid / slurry connected to a main pipeline, A connecting pipe for taking the sample into the sample tank, (c) a first opening / closing valve disposed in the connecting pipe, and (d) supplying compressed air from a compressed air source to the sample tank. And (e) a second on-off valve disposed in the introduction pipe, and (f) a pressure gauge for detecting a pressure in the sample tank. Gas content measuring instrument.