RU189336U1 - WET GAS GENERATOR - Google Patents

Abstract

The wet gas generator is designed to create a stream of wet gas with a dew point temperature (volume fraction of moisture) in the range of minus 70 ° C to plus 20 ° C (from 4.9 to 23,000 million). The solution is aimed at ensuring the possibility of carrying out the calibration and calibration of hygrometers at a working pressure of up to 25 MPa at the place of operation at the oil and gas producing and processing industries, in explosive conditions. The technical result is achieved due to the fact that the pressure stabilized gas from the gas treatment unit enters the dryer. Two lines of gas flow are formed from the dried gas - a dry line and a wet gas line containing taps for fine adjustment of the gas flow. Both gas flows into the mixing chamber located in the humidification chamber. Moreover, the gas of the wet line enters the mixing chamber after ozonation in the humidification chamber, and the gas of the dry line through the heat exchanger located in the humidification chamber. This eliminates the decrease in the temperature of the saturated gas in the mixing chamber and condensation. From the mixing chamber gas with a given humidity enters the generator output. The setting of humidity in the operating range of the generator is reduced to the installation of the fine adjustment of the corresponding gas flow through the lines of dry and wet gas by means of micrometric screws and controlling the set value of gas humidity using a reference hygrometer. The lack of electronics and electrical circuits ensures that the generator meets the stringent requirements imposed on equipment at the oil and gas producing and processing industries, and allows the generator to operate in explosive environments.

Description

The proposed device relates to a technique for measuring the humidity of gases and can be used to obtain model calibration gas-vapor mixtures at high pressure, during calibration and calibration of natural gas hygrometers, flow and immersion (with external chamber) types at the site of operation at operating pressure.

Technical level

A patent search revealed the following analogues. The “wet gas generator” is known (invention No. 2622833, IPC GO / W 1/8. Publ. 7.06.2017).

The invention relates to the field of analytical instrumentation and is intended to determine the components of the error of the consumer during operation during the mandatory routine work and before periodic calibration of hygrometers to measure the volume fraction of moisture of pure neutral gases specified in the technical specifications for a specific type of hygrometer. A wet gas generator, which is a hollow metal cylinder with inlet and outlet fittings for the inlet and outlet of the gas to be analyzed, has a hollow metal capsule inside the cylinder, the ends of which have pneumatic resistances with calibrated holes. Inside the hollow capsule is a source of moisture - water and the capsule using centering pads of fluoroplastic with transverse holes for the passage of gas is fixed in the center of the metal cylinder. All of this is a simple structure with small dimensions, easy to make and easy to operate. Using such a generator, you can set the required humidity to determine the error component of the hygrometer, and the change in the specified humidity can be adjusted by changing the total gas flow through the tested hygrometer.

           Disadvantages.

The proposed design is not designed for operation at high pressures, besides it is stationary.

Known "generator of wet gas" (utility model No. 134297, IPC F1 / 02, publ. 10.11.2013,)

Wet gas generator containing a dry gas channel consisting of a compact compressor, a receiver, a drying cartridge, a dust collecting filter and a control rotameter of a gas to be dried, and a wet gas channel containing a saturator, as well as a mixing chamber into which dry and wet gas flows, a control sensor humidity and a block of working chambers, characterized in that it is additionally equipped with a microprocessor system designed to control the operating modes of the generator and regulate flows into the channel ah of dry and wet gas and dry and wet gas channels connected to small-sized air compressors, to the generator's operating authority, to the saturation unit temperature maintenance unit and to the control thermo-hygrometer built into the mixing chamber, while the small-sized air compressors are covered by feedback on the set humidity and two voltage feedbacks, and the wet gas channel additionally contains successively located small-sized air compressor, the receiver is wet Channel and the dust filter, the output of which is connected to the input, saturating, thus, saturating temperature control system is provided that is connected to the node, saturating maintain temperature.

Disadvantages.

This device is not intended for use under pressure.

The prototype was taken as a wet gas generator and a method for generating gas with the required humidity (invention No. 2.540.885, IPC Ff24F6 / 00, published on October 27, 2014).

The essence of the present invention is as follows.

Wet gas generator containing a dry gas channel consisting of a small-sized compressor, a receiver, a drying cartridge, a dust collecting filter and a control rotameter of a gas to be dried, and a wet gas channel containing a saturator, as well as a mixing chamber into which dry and wet gas flows; according to the declared solution, the humidity sensor and the unit of working chambers are additionally equipped with a microprocessor system designed to control the operating modes of the generator and control the flow in dry and wet gas channels and dry and wet gas channels connected to small-sized air compressors, to the generator operating authority, to the saturation unit temperature maintenance unit and to the control thermo-hygrometer built into the mixing chamber, while the small air compressors are covered by the feedback on the level specified humidity and two voltage feedbacks, and the wet gas channel additionally contains successively located small-sized air compressor; A wet channel and dust filter, the output of which is connected to the inlet of the satcher, while the satcher is equipped with a temperature control system connected to the node maintaining the temperature of the satcher. And also due to the fact that the optical-electronic indicator of the minimum water level is installed in the satcher, the satcher is equipped with an additional camera equipped with a viewing window, in which the float indicator for monitoring the maximum water level is located, the temperature control system consists of a heating winding and a temperature sensor, each of the working chambers are provided with an entrance for the entry of the generated gas-vapor mixture and an outlet through which the mixture, after passing through the space of the working chamber, is discharged into the surrounding atmosphere ru through the exhaust port. Moreover, the required humidity is achieved by mixing in certain ratios of flows of dry and wet gas, according to the stated solution, the flows of dry and wet gas are regulated by applying appropriate supply voltages to small air compressors, and the voltage on each of the compressors is determined by the following dependencies:

U _B = U _Σ ⋅RH / 100, (volt);

U _C = U _Σ -U _Σ ⋅RH / 100, (volt),

where U _B is the voltage at the compressor of the wet gas channel, U _C is the voltage at the compressor of the dry gas channel, U _Σ is the total voltage equal to 200 volts, RH is the relative humidity,%.

The disadvantages of the prototype.

1. The main disadvantage of the considered generator is the inability to carry out work on the calibration and calibration of hygrometers in field conditions at the place of operation of hygrometers and at high pressures. At the enterprises of the oil and gas and processing industries, the working pressures of gas media can reach several hundred atmospheres. At the same time, calibration of hygrometers is carried out at atmospheric pressure. This may be a source of additional errors during calibration.

2. There are no structural elements that provide intrinsically safe and explosion-proof design when used in the construction of the generator of electronic and electrical components. This does not allow for work at the oil and gas industry and the processing industry in the hazardous area at the place of operation.

The objective of the proposed device is the creation of a portable generator of wet gas, which provides for obtaining vapor-gas test mixtures at high pressure, as well as improving the accuracy and reliability of work in harsh environments, including in explosive conditions.

The essence of the proposed device is as follows:

The wet gas generator contains a dry and wet gas supply, a desiccant, a humidification chamber and a mixing chamber, characterized in that it additionally includes: a gas preparation unit providing a pressure stabilized gas containing a gas supply source, a gas pressure stabilizer, a gas fine filter and pressure gauge; humidification and mixing unit, includes a line of dry and wet gases, equipped with ball and needle taps with micrometric screws to regulate the gas flow, the dry gas line contains a dry gas column, a heat exchange device designed to equalize the temperature of dry and wet gases, the wet gas line contains a humid gas column and a humidification chamber, with the lines of dry and wet gases converging in the mixing chamber, which is located in the humidification chamber and provided with a pipeline to exit the wet o gas, and the humidification chamber is equipped with pipelines for filling and draining water.

The claimed solution is illustrated graphic materials. FIG. 1. given the General scheme of the generator of wet gas, which shows:

1. Gas treatment unit;

2. The source of gas supply;

3. Gas pressure stabilizer;

4. Fine filter;

5. Pressure gauge;

6. Drain unit;

7. Gas supply device to the dryer;

8. Desiccant;

9. Block moistening and mixing;

10. Column for dry gas with ball valve and needle valve;

11. Column for wet gas with ball valve and needle valve;

12. Moisturizing chamber;

13. Heat exchange device;

14. Mixing chamber;

15. Pipeline for draining water from the humidification chamber;

16. Pipeline for pouring water into the humidification chamber;

17. Pipeline wet gas outlet.

Structurally, the generator is made in a metal case. On the front and rear panels are the controls of the generator.

Device and principle of operation.

The operation of the wet gas generator is based on the method of mixing the flows of wet and dry gas with its subsequent output to an external reference hygrometer and a calibrated instrument.

The wet gas generator contains a gas treatment unit 1 containing a gas supply source 2, a gas pressure stabilizer 3, a gas fine filter 4 and a pressure gauge 5; the drying unit 6, which includes a device for supplying gas to the dryer 7 and the dryer 8; humidification and mixing unit 9, including columns 10 and 11, consisting of series-connected taps - ball and needle taps of fine adjustment, heat exchanging device 13, humidification chamber 12 with a pipeline for filling water 16 and draining water 15, mixing chamber 14 with a pipeline for leaving wet gas 17. The pressure stabilized gas from the gas treatment unit 1 is fed to the drying unit 6, through the gas supply device 7 to the dryer 8. The dried gas from the dryer 8 enters the humidification and mixing unit 9, including columns 10 and 11, consisting of series-connected valves - ball and needle valves fine adjustment. Two gas flow lines are formed in the columns: a dry line and a wet gas line. Gas from the dry gas column 10 through the heat exchange device 13 enters the mixing chamber 14 located inside the humidification chamber 12 under a layer of water. The gas from the humid gas column 11 enters the humidification chamber 12 and, after humidification during the bubbling process, enters the mixing chamber 14. After mixing in the mixing chamber 14, gas, with the set humidity value, enters the humid gas outlet pipe 17.

Setting the humidity in the operating range of the generator is reduced to the installation of fine-tuning needle valves with the micrometric screws of the fine adjustment of columns 10 and 11 of the corresponding gas flow through the lines of dry and wet gas and monitoring the set value of gas humidity using the reference hygrometer.

The accuracy of the task and the time stability of the humidity reproduced by the generator is determined by the pressure stabilizer used, as well as by the tightness of the gas circuit connections.

The technical result is achieved due to the fact that the pressure stabilized gas from the gas treatment unit 1 enters the dehydration unit 6. Two lines of gas flow are formed from the dried gas - a dry line and a wet gas line containing taps for fine adjustment of the gas flow. Both gas flows into the mixing chamber 14 located in the humidification chamber 12. Moreover, the wet line gas enters the mixing chamber 14 after bubbling in the humidification chamber, and the dry line gas through the heat exchanger 13 located in the humidification chamber 12. This eliminates the decrease in saturated wet temperature gas in the mixing chamber 14 and condensation. From the mixing chamber gas with a given humidity enters the generator output. The setting of humidity in the operating range of the generator is reduced to the installation of the fine adjustment of the corresponding gas flow through the lines of dry and wet gas by means of micrometric screws and controlling the set value of gas humidity using a reference hygrometer.

The accuracy of the task and the time stability of the gas generated by the generator are determined by the pressure stabilizer, the throttles of the wet and dry gas lines, the temperature stability of the humidification chamber, and the tightness of the connections of the gas path of the generator.

The structural elements of the generator are designed to operate at high pressure, have a significant mass. Due to the large mass and heat capacity of the humidification chamber, passive stabilization and uniformity of temperature in the volume of the humidification chamber are provided; therefore, the temperature decrease due to the saturation effect and the influence of ambient temperature fluctuations is insignificant. The use of taps for fine adjustment of gas flow rates through dry and wet gas lines (chokes) with micrometric screws allows you to set and maintain a given level of gas humidity without the use of flow meters and solenoid valves. The use of high-quality fittings and elements of the gas path ensures the tightness of the gas path and the stability of the generated moist gas. The lack of electronics and electrical circuits allows the generator to operate in explosive environments.

1. The ability to carry out work on the calibration and calibration of hygrometers at pressures up to 25 MPa.

2. The large mass and heat capacity of the structural elements of the generator, in particular the humidification chamber, provides passive stabilization and uniformity of temperature in the volume of the humidification chamber without the use of sensors and complex electronics. Therefore, the influence of ambient temperature fluctuations is insignificant.

3. The use of taps for fine adjustment of gas flow rates through dry and wet gas lines (chokes) with micrometric screws allows you to set and maintain a predetermined level of gas humidity without using flow meters, electromagnetic valves and sophisticated electronics. The use of high-quality fittings and elements of the gas path ensures the tightness of the gas path and the stability of the generated moist gas.

4. The lack of electronics and electrical circuits ensures that the generator meets the stringent requirements imposed on equipment at the oil and gas producing and processing industries, and allows the generator to operate in explosive environments.

An example of the proposed generator of wet gas.

The wet gas generator provides the creation of a wet gas stream with a dew point temperature (volume fraction of moisture) in the range of minus 70 ° C to plus 20 ° C (from 4.9 to 23,000 million ¹ ) and performing calibration and calibration of hygrometers at operating pressure up to 25 MPa on-site at the enterprises of oil and gas and processing industry, in explosive conditions.

Generator operating conditions:

- ambient temperature from + 5 ° С to + 25 ° С;

- atmospheric pressure from 84 to 107 kPa (from 630 to 804 mm Hg. Art.);

- relative ambient humidity up to 90% without condensation,

- the content of impurities and dust within the sanitary standards;

The generator is powered by a dry gas with a gas dew point of not more than minus 60 ° C, an overpressure of up to 25 MPa and a gas flow rate of at least 5 l / min.

Air, nitrogen and other pure and neutral gases can be used as the working gas. The gas temperature at the generator inlet is from 5 ° C to 25 ° C. The permissible tilt angle of the generator relative to the horizontal surface in any direction is not more than 5 °.

Claims (1)

 The wet gas generator includes a dry and wet gas supply, a desiccant, a humidification chamber and a mixing chamber, characterized in that it additionally includes: a gas preparation unit that provides a pressure stabilized gas containing a gas supply source, a gas pressure stabilizer, a gas fine filter and a manometer, a humidification and mixing unit includes a line of dry and wet gases, equipped with ball and needle taps with micrometric screws for controlling the gas flow, the dry gas line containing a column dry gas, a heat exchange device designed to equalize the temperature of dry and wet gases, the wet gas line contains a wet gas column and a humidification chamber, with the dry and wet gas lines converging in the mixing chamber, which is located in the humidification chamber and provided with a pipeline to exit the wet gas, and the humidification chamber is provided with piping for filling and draining water.

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