SU58490A1 - Instrument for measuring the moisture content of gases - Google Patents

Description

In practice, it is often necessary to determine the humidity of air and various gases (flue gases, exhaustive ones, etc.).

There is a series of npH6opQ3 for this. In most cases, they are very complicated, and in some of them the determination of humidity is carried out by cooling gases, for example, air, below the dew point and measured at their fatigue temperature by means of a resistance thermometer included in the measuring instrument circuit.

The proposed device is also based on this principle and consists of a tubular cooler with a water jacket through which the test gas flows and within which the coils of the resistance thermometer are located in the gas flow and the thermopile junction, the second bpi and the second resistance thermometer are placed in a thermostat.

In this case, the thermostat can only be filled in the form of a tube fitted with a steam jacket, inside which the second thermopile junctions or turns of the second resistance thermometer are located in the vapor medium.

To maintain a constant liquid level in the thermostat boiler, a Mariotte vessel communicating with it serves, and to obtain a constant temperature of the test gas before entering the cooler tube, T} contains a special cooling or p-heating device.

In FIG. 1 shows a front view of the device proposed: FIG. 2- side view; FIG. 3 - in the plan.

The principle of operation of the proposed device is as follows.

If a moist gas with an unspecified initial temperature is passed through a tube cooled with cold water from outside, then as the gas moves, its temperature will drop sharply. However, when the temperature reaches a value corresponding to the dew point of water vapor, then its further change, due to the release of latent heat (h1 evaporation, slows down, and theoretically, generally speaking, it will stop.) After the water vapor has precipitated, the gas temperature will again noticeably decrease.

Placing on the portion of the cooled tube where the water contained in the gas is condensed

steam, a thermocouple, or, even better, a thermopile, with the help of a galvanometer, obtain or automatically register the temperature of a volume of dew corresponding to the gas content of the moisture content. The galvanometer can be calibrated directly in weight or volume units.

The apparatus for carrying out the process described consists of a water jet ejector 1, which serves to suck and follow-up gas from the working chamber (gas duct, gas line, air duct or the like) to the instrument through equipment 2 to maintain a constant gas temperature at the entrance to the instrument. Depending on the operating temperature and the subsequent gas in the place of its removal, the device 2 may be in the form of a heater or cooler. In all cases, the gas temperature is brought to a certain constant temperature (100 °). For this, for example, when the temperature of the test gas is below 100 ° C, device 2 is a gas-dispensing tube equipped, for example, with a carboroid filter and having a steam jacket.

After adaptation 2, a component is located. The main part of the device is a cooler tube 3 with a water jacket. Gases entering tube 3 from tool 2 are removed from it through choke 4 by ejector 1 to a discharge line.

In the tube 3 are thermocouple junctions 5; its second junctions are derived in a TepMoicTaT 6 ion bulb. A thermopile 5 is connected to a galvanometer. Steam thermostat 6 consists of a tube 8. with double walls to the electric boiler 9. The latter gives saturated water vapor with a temperature of 100, which passes through the annular space of the tube 8, where the second thermopile junctions are located 5, and goes outside.

Water enters through valve 10 first into the water jacket of refrigerator 3, from where most of it goes further to ejector 1, and less through valve 11 to Mariotta vessel 12, which makes up a pair of communicating vessels and has a drain pipe 13, thanks to which

the water level in the boiler 9 is kept at the same height all the time. .

To control the amount of gas sucked through the device, a differential water meter 14 is connected to the tube sections in front of and behind the choke 4. Condensate is drained from the tube of the refrigerator 3 automatically through a barometric tube TjfOMep 15 with a water seal.

The operation of the ejector is controlled by the valve 10, and the flow of water into the boiler is controlled by the valve 11. The operation of the device 2, as well as the thermostat 6, is monitored by mercury thermometers 16 and 17.

For sampling of wet gases, a tap 18 is provided. The temperature of the cooling water must be lower than the dew point temperature that corresponds to the minimum possible in the existing moisture content of the test. My gas or air.

Instead of a thermopile, two resistance thermometers can be used, the turns of one of which should then be placed on the spot of one thermopile junction 5 in the tube 3, and the turn of the other on the spot of its second junction in the thermostat.

Subject and d ore and and.

Claims (2)

1. An instrument for measuring the moisture content of gases, for example, air, by cooling them below the dew point and measuring their temperature, characterized in that it is designed as a tube-cooler equipped with a water jacket, which passes through the test gas The thermopile junctions (or resistance thermometer) are located in the gas flow, the second junctions of which (or the second resistance thermometer) are placed in the thermostat. 2. The form of the device according to claim 1, characterized in that the thermostat is made in the form of a tube connected to the boiler and equipped with a steam jacket, inside which are located in the steam medium the second thermopile junctions (or second resistance thermometer).