RU334U1 - Device for measuring gas flow in a gas duct of a main gas pipeline turbine - Google Patents

Abstract

A device for measuring the gas flow in the turbine gas duct of the main gas pipeline, consisting of a housing with measuring means placed in it and connected to a differential pressure gauge, characterized in that the measuring means is connected to a contact device and made in the form of an averaging tube, the left part of which is connected to the differential pressure gauge, and the minus part of the differential pressure gauge through the impulse tube — with a gas duct and pressure gauge, and the “left” part of the averaging tube is equipped with additional averaging elements made, for example p, in the form of a sleeve with holes at an angle of 120 ° to each other, and the sleeve located in the end flange of the averaging tube is made with holes at an angle of 180 ° to each other, while the centers of the holes of the "right" part of the averaging tube are located at medium radii four equal in area parts of circular cross sections of the duct, perpendicular to the axis of the duct.

Description

DEVICE FOR MEASURING GAS CONSUMPTION IN A GAS FLOW OF A TURBINE OF A MAIN GAS PIPELINE

The utility model relates to measuring equipment, in particular for measuring the flow of flue gases in the gas duct of a main gas pipeline turbine.

A device for measuring gas flow rate is known, comprising a measuring channel with a pitot tube placed in it and connected to a differential pressure gauge, the device is equipped with a receiver, the input of which is connected to the inlet pipe, the output is connected to the output fan, and a pressure gauge is connected in the receiver’s cavity, the measuring channel between the receiver and the fan is an adjustment choke (see copyright certificate N 696 293

published on November 5, 197). The above device does not allow each new measurement of pa y4iipuiu.ii i sludge b, gas duct & preliminary shutdown of process equipment, installation and commissioning of the flow meter with the subsequent start-up of the process

equipment to work. This device is taken | 1 as

prototype. ,,, ....-, -

The purpose of the utility model is the ability to measure gas flow in the turbine duct of the main gas pipeline without stopping the process equipment with increased measurement accuracy. This goal is achieved by the fact that in the new device for measuring the gas flow in the gas duct of the turbine of the main gas pipeline, consisting of a housing with a measuring tool placed in it connected to a differential pressure gauge, while the measuring medium MKJlGOlF 1/46,

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The device is connected to the contact device and is made in the form of an averaging tube, the left part of which is connected to the p-lux sampling of the differential pressure gauge, the negative selection of the differential pressure meter through the impulse tube is connected to the gas duct and manometer, and the left part of the averaging tube is equipped with additional averaging elements, for example , in the form of a sleeve with holes at an angle of 120 degrees relative to each other, a expansion chamber, and holes at an angle of 180 g are made in the sleeve located in the end flange of the averaging tube of the Audus relative to each other, while this is 1U1, the centers of the openings of the right part of the averaging tube are located on the average radii of four equal in area parts of the circular sections of the duct perpendicular to the axis of the duct.

Distinctive features of the claimed technical solution are:

1. Connectivity measuring instrument I Hu i THbiM device

BOM, which allows gas flow measurements without stopping the process with increased accuracy; .1

2. The measuring tool is made in the form of an average la - -pipe, the right part of which is installed in the duct, the left part is connected to the positive selection of the differential pressure gauge, and the negative selection of the differential pressure gauge is connected to the gas duct.

3. The averaging tube is additionally equipped with averaging elements, for example, in the form of a sleeve in which holes are made at an angle of 120 degrees to each other, an expansion chamber and a sleeve with holes at an angle of 180 degrees to each other,

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the centers of the holes in the right part of the averaging tube are located on the average radii of four equal in area parts of the circular cross sections of the duct, perpendicular to the axis of the duct.

The above significant distinguishing features in combination with the known features will allow us to solve the problem, namely, to measure gas flow with increased accuracy without stopping the process. The utility model declared by us allows for safe input, mounting and output of a gas flow sensor on operating turbines.

The time for installing and removing the sensor does not exceed 1 minute.

Figure 1 shows the measuring means of the gas flow sensor, sections A-A, BB, figure 2 shows the contact device, sections BB, G-D, D, D, figure 3 shows the measuring means of the flow sensor and a contact device assembly with a connected measurement circuit.

The measuring means of the flow sensor of Fig. 1 represents an averaging tube, which consists of the right part of the averaging tube 2, where the holes 3 are located, the left part of the averaging tube, which consists of a sleeve 4, an expansion chamber 5, a sleeve 6, a flange 7. The purpose of the right part of the averaging tube Tube-accept the central holes located on R 1 and R 2, the gas flow from the gas duct, the extreme openings R3 and R4 - to bring this flow into the gas duct and at the same time form in the tube cavity the total averaged pressure proportional to speed aza in the measuring duct.

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The holes 3 of the right part of the averaging tube 2 of the measuring means of the sensor 1 are located on the average radii of equal in area parts of the circular sections of the duct, perpendicular to the axis of the duct. The sleeve has three holes located at an angle of 120 relative to each other / size B / B, the sleeve 6 has two holes located at an angle of 180 relative to each other / section A-A /. The planes where the centers of the openings of the sleeves 4 and 6 are located are perpendicular to the axis of the sensor 1, and the plane where the centers of the holes of the sleeves 4 are located is located at a distance O ,, 96 of the radius of the measuring duct. The flange 7 serves for additional orientation of the holes 3 of the right part of the measuring means of the sensor 1 on the plot of the incoming gas flow and fastening to the contact device 8 in the working position, Fig.Z.

The purpose of the additional averaging elements: sleeve 4, averaging expansion chamber, sleeve 6 - to eliminate the pulsating components of the total averaged pressure and improve the measurement accuracy.

Figure 2 shows the contact device 8, which consists of thermally insulating flanges 9, in which the guide bushings 10, the chambers 11 with the valves 12, the shut-off 13 and the end flange 14 are fixed. The contact device 8 is intended for safe input and input of the measuring means of the sensor 1 on operating equipment, orienting it on the axis of the gas duct and the plot of the oncoming gas flow, fixing the measuring means of the sensor 1 in the working position, closing the opening of the flange 14 without the measuring instrument with a cover 13.

Thermal insulation of the flanges 9 is carried out, for example, by asbestos gaskets.

Fig. 3 shows the measuring means and the contact device assembly, the sensor 1 is placed in the gas duct 15, fixed in the contact device 8 and connected through a pulse tube 16

with positive selection of a differential pressure gauge 17. Static pressure

it is taken from the wall of the gas duct 15, through a pulse tube 18 it is brought to a differential pressure gauge 17 and a pressure gauge 19. The place for taking the static pressure is regulated and is located near the measuring means. Device for measuring gas flow in the gas duct of turbines; The gas pipeline works as follows:

the measuring unit is turned on according to the diagram in Fig. H The openings of the right part of the averaging tube 2 of the measuring means 1 should be directed towards the gas flow in the gas duct 15. This is achieved by placing special marks on the flange 7 of the measuring medium of the sensor 1 and the flange 14 of the contact devices 8. The position of the holes 3 can also be duplicated by the greatest pressure drop occurring between the total and static pressures on the differential pressure gauge 17, with small turns the gauges C) 1 о of the sensor 1 around its axis.

The gas flow in the flue 15 running on the right-hand side of the averaging tube 2 of the measuring means of the sensor 1 of Fig. 3 forms a local gas flow b of the cavity 2 and the total averaged pressure, proportional to the gas velocity in the flue. it

the pressure at a distance of 0.96 of the radius of the gas duct becomes constant and contains pulsating components of the dynamic pressure of the gas.

The full averaged pressure is taken from the cavity of the right part of the averaging tube 2 by the holes of the sleeve 4 and is fed into the left part of the averaging tube-expansion chamber 5, from which through the holes of the sleeve 6 and the impulse tube 16

goes to the positive selection of the diemmanometer 17. Static

the pressure along the pulse tube-18 is supplied to the pressure gauge 19 and the negative selection of the differential pressure gauge 1 7.

The design of the sleeve 4, the sleeve 6 ,, of the averaging expansion chamber 5 makes it possible to maximally neutralize the pulsating components of the dynamic gas pressure of the total averaged pressure and increase the measurement accuracy.

The difference in total averaged pressure obtained from the sensor and static pressure has a quadratic characteristic, therefore, standard secondary devices can be used, including and connect the measuring instrument to the centralized control system i i-angle control.

This device for measuring the gas flow in the gas duct of a gas main turbine was successfully tested at the compressor station GP Ce5 (- i-L industrial in the 1st quarter of 1993.

Posted by -.J / C.S, / L /

Xix

L 3

Claims (1)

A device for measuring the gas flow in the turbine gas duct of the main gas pipeline, consisting of a housing with measuring means placed in it and connected to a differential pressure gauge, characterized in that the measuring means is connected to a contact device and made in the form of an averaging tube, the left part of which is connected to the differential pressure gauge, and the minus part of the differential pressure gauge through the impulse tube — with a gas duct and pressure gauge, and the “left” part of the averaging tube is equipped with additional averaging elements made, for example p, in the form of a sleeve with holes at an angle of 120 ° to each other, and the sleeve located in the end flange of the averaging tube is made with holes at an angle of 180 ° to each other, while the centers of the holes of the "right" part of the averaging tube are located at medium radii four equal in area parts of circular cross sections of the duct, perpendicular to the axis of the duct.