Method of dispersed phase carry-over measurement in gas stream and device for its implementation (versions)

FIELD: oil-and-gas production.

SUBSTANCE: method of measurement of dispersed phase carry-over includes passing through filter-mount of particular volume of gas samples with following definition of overweight of filter-mount ensured by deposition of dispersed phase. Additionally this volume of gas sample is bleed through bleeder probe. Extracted moisture is collected in additional filter-mount, additional filter-mount is overlapped. Particular volume of gas sample is directed to filter-mount during particular period of time at steady gas flow through installation, which provides regulator implemented in the form of block with set of standardise critical jet. Installation implementing method contains bleeder probe, filter-mount, additional filter-mount for collecting of extracted moisture, regulator of steady flow of gas at pressure, temperature and velocity in system of installation, equal to pressure, temperature and velocity of gas stream, implemented in the form of block with set of standardised critical nozzles.

EFFECT: receiving of more exact values of entrainment of discontinuous phase in gas flow.

2 cl, 1 dwg, 1 tbl

 

The invention relates to the field of quality control in the preparation of natural and associated gas to transport oil and gas industry and can be used for fuel and energy, chemical, petrochemical and oil refineries. Quality control gas is carried out by sampling and determination of entrainment of the dispersed phase.

It is known in practice gas analysis solution, providing for transmission of the investigated mixture through two cameras, equipped with sensors, see inventor's certificate SU # 320771, C01N 30/00, 1971.

However, this solution does not allow you to lock in moisture.

There is a method of indicating the presence in the gas mixture of condensed moisture, which consists in the introduction of the sample into the chamber and the metering in the camera moisture content of the mixture. A device for implementing this method includes a sampler connected to the camera with an inlet and outlet, in which the sensor is installed moisture content, see US Patent No. 3552187, CL-23, publ. 1971.

The known method and device for its implementation point only to the detection (indication), but does not record the presence of condensed-weighted moisture in the selected sample of gas from its flow, which, in turn, reduces the reliability of determining the amount of moisture content.

There is a method of indicating the presence in the gas mixture of condensed moisture, which consists in the introduction of the sample into the chamber and the metering in the camera moisture content of the mixture while introducing a sample into the second chamber, the pressure in chambers set of different sizes, but below the pressure at the sampling location, measure the amount of moisture in the second chamber, the deviation of which from the magnitude of the moisture content in the first chamber judge the presence of a mixture of condensed moisture. The temperature in the chambers support is not lower than the temperature at the sampling location.

Installation for implementing this method includes a sampler connected to the camera with an inlet and outlet, with a moisture sensor, the device has connected to the sampler of the second chamber, the cross section of the inlet of which is equal to the cross-section of the input section of the first chamber, and the cross section of the outlet is not equal to the cross-section of the outlet of the first chamber, see inventor's certificate SU # 879425, IPC G01N 25/56, 1981.

The known method and installation for its implementation can only detect the presence of condensed moisture in the sample gas and do not allow to quantify the entrainment as drip-weighted moisture and disperse phase in the gas stream.

There is a method of measuring entrainment of the dispersed phase in the gas stream, including the PCC is the stated through the sampling probe into the system a certain amount of the sample gas at the temperature of the gas stream, next, using the valve on the separator on the meter, set the required flow of selected gas, controlling it in the measurement process, if necessary, open the valve on the drip for the implementation of the filing of hydrate inhibitor, and glass volumetric capacity is determined not earlier than after 0.5 hours, the number of accumulated liquid, and the solids content in the filter cartridge separator was determined after drying super-thin fiber filter under his weight.

Installation for implementing this method includes sampling probe, representing the tip with the internal channel of square cross section with an exit angle of 90°, the cage, inside of which is in series along the gas installed filter cartridge, made of superthin glass and mesh bumpers made from tubular knitted mesh, and the separator is connected with a pocket for the installation of thermometer, as well as with measuring capacity, made in the form of a container with drainage and sight glass for visual measurement of the captured fluid volume, while measuring the capacitance across the drain is connected to the regulator constant flow of gas counter gas rotary which is connected to the separator via a regulating valve, see Gasanov, Angelkov Gkibel. Technological processes of preparation and natural gas and methods of calculation equipment. LLC Bowels. Business center" Moscow. Printed in Production and publishing the works VINITI, s, 2000

The disadvantages of this method with the device for its implementation are inaccurate measurement of the magnitude of the entrainment of the dispersed phase in the gas stream, the duration of sampling and complex instrumentation.

The closest in technical essence is a method of measuring the entrainment of the dispersed phase in a gas stream, comprising passing through the filter cartridge of a certain volume of the sample gas with an estimated pressure in the plant with the subsequent determination of the gain of the filter cartridge due to the deposition of the dispersed phase, and passing the sample gas through the filter is carried out at a pressure, temperature and gas flow rate and within a specified period of time at a constant flow rate of gas through the installation regulated by means of valve controlled by the readings of the pressure gauge installed upstream of the throttle.

Installation for the implementation of this method, including filter, regulator, constant flow of gas at a pressure, temperature and speed setting, equal pressure, temperature and gas flow rate, as the regulator includes a valve and a choke with pressure gauge, see Gasanov, Angelkov Gkibel. Technological processes of preparation prirodno the gas and methods of calculation equipment. LLC Bowels. Business center" Moscow. Printed in Production and publishing the works VINITI s.204, 2000

The disadvantages of this method of measuring entrainment of the dispersed phase in the gas stream and installation for implementing this method are the high accuracy measurement of entrainment of the dispersed phase in the gas stream, associated with a possible allocation of moisture when the set pressure in the installation, which is captured by the filter cartridge and reduces the reliability of the obtained measurement results. In addition, by passing the sample gas through the throttle there is a sharp decrease of the gas temperature, which cools the walls of the installation and reduces the temperature inside, the temperature of the sample gas is no longer equal to the temperature of the gas stream, which leads to a distortion of the results. Additionally, the design of the plant allows to take samples of the gas near the wall of the pipeline, which moves the gas stream.

The objective of the invention is to obtain more accurate values of the entrainment of the dispersed phase in the gas stream.

The technical problem is solved by a method for measuring entrainment of the dispersed phase in the gas stream, including the transmission of pressure, temperature and gas flow rate through the filter cartridge of a certain volume of the sample gas with subsequent determination of the gain filter is of the cartridge due to the deposition of the dispersed phase, in which the volume of the sample gas taken from the gas stream through the sampling probe, and when the set pressure in the system is equal to the pressure of the gas stream released moisture trap in additional filter cartridge, and after the set pressure additional filter block, and a certain amount of the sample gas is directed into the filter cartridge within a certain period of time at a constant flow rate of gas through the installation, which provides the regulator, made in the form of a block with a set of calibrated critical nozzle.

Installation for implementing this method includes filter, regulator, constant flow of gas at a pressure, temperature and velocity in the system is equal to the pressure, temperature and gas flow rate, the installation further comprises a sampling probe, an additional filter to capture spin-off moisture while set in the system unit of pressure equal to the pressure of the gas stream, and the controller of the permanent gas flow is made in the form of a block with a set of calibrated critical nozzle.

Technical solution allows to obtain more accurate values for the entrainment of the dispersed phase in the gas stream with the possibility of changing the place of sampling.

Device for measuring entrainment of the dispersed phase in the gas stream will win the sampling probe 1, filter cartridge 2 and the additional filter cartridge 3 to capture spin-off moisture while set in the installation system pressure equal to the pressure of the gas stream, the controller 4 constant flow of gas at a pressure, temperature and velocity in the system is equal to the pressure, temperature and gas flow rate, which is made in the form of a block with a set of calibrated critical nozzle, and the device unit is connected through a piping system and valves 5-10, see figure 1.

Installation for implementing the method for measuring entrainment of the dispersed phase in the gas flow works as follows.

Determine the content of the dispersed phase in the gas stream moving through the pipeline with an inner diameter D. the Volumetric gas flow rate Q.

Pre-determine the gas flow rate through the installation for compliance with velocity equal to the velocity of the gas stream. To do this, calculate the volume flow of gas through the installation according to the formula

where d is the inner diameter of the sampling probe.

According to the calculated value of q pick up a set of calibrated critical nozzle and install them into the controller 4 a constant gas flow, providing a given volume flow of gas.

Determine the weight of the filter cartridge 2.

To the sampling pipe fitting tightly connect the receive sampling probe 1 can move it inside the pipeline.

Next, perform the purging of the sampling probe through the opening and closing of the valve 10.

When preparing to set pressure in the system is equal to the pressure of the gas stream with closed valves 5 and 9, open valves 6 and 7. The set pressure is carried out by opening the valve 5, which point is the throttling part of the gas through the valve and isolation of condensed moisture, which capture additional filter cartridge 3.

After the set pressure block additional filter cartridge 3 by opening the valve 9 and closing valves 5 and 6.

Measurement of entrainment of the dispersed phase is carried out by passing selected through the sampling probe of the sample gas at a pressure, temperature and gas flow rate through the filter cartridge 2 within a certain period of time at a constant gas flow through the plant. To do this, open the valve 8, and after a certain period of time, close the valve 9, with a constant flow of gas through the installation of pressure, temperature and velocity in the system device is equal to the pressure, temperature and gas flow rate, provides the regulator 4, made in the form of block calibrated critical nozzle.

After reaching atmospheric pressure in the setting that is controlled by a pressure gauge installed on the controller 4 a constant gas flow,the filter cartridge 2 is removed and determine its weight.

The measurement results for the gas flow at Q=299000 standards. m3/h, D=374 mm at different positions of the sampling probe shown in table 1.

Table 1
# ExampleThe position of the sampling probe in the pipelineThe average value of the entrainment of the dispersed phase, g/1000 norms. m3/h
1Prototype20,125
2Installing the claimed object, the sampling probe is located near the wall of the pipeline14,253
3Installing the claimed object, the sampling probe is located on the axis of the pipeline3,461

As can be seen from the examples of embodiment, the object prototype determines the amount of entrainment of the dispersed phase with high accuracy, installation design allows you to take samples of the gas near the wall of the pipeline.

Declare the object more accurately determine the amount of entrainment of the dispersed phase, moreover, at various points in the pipeline.

Installation for the implementation of the ways the and measure the entrainment of the dispersed phase in the gas stream passed industrial tests and proved, as simple and convenient in operation.

1. A method of measuring the entrainment of the dispersed phase in the gas stream, including the transmission of pressure, temperature and gas flow rate through the filter cartridge of a certain volume of the sample gas with subsequent determination of the gain of the filter cartridge due to the deposition of the dispersed phase, wherein the volume of the sample gas taken from the gas stream through the sampling probe, and when the set pressure in the system is equal to the pressure of the gas stream released moisture trap in additional filter cartridge, and after the set pressure additional filter block, and a certain amount of the sample gas is directed into the filter cartridge within a certain period of time at a constant flow rate of gas through the installation, which provides the regulator, made in the form of a block with a set of calibrated critical nozzle.

2. Installation for implementing the method according to claim 1, containing a filter, regulator constant flow of gas at a pressure, temperature and velocity in the system is equal to the pressure, temperature and gas flow rate, characterized in that it further comprises a sampling probe, an additional filter to capture spin-off moisture while set in the system unit of pressure equal to the pressure of the gas flow is, and regulator constant gas flow is made in the form of a block with a set of calibrated critical nozzle.



 

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