SU1430612A1 - Gas-lift plant - Google Patents

Abstract

Invention m. used in energy, metallurgy and mining industry. The purpose of the invention is to reduce environmental pollution. The upper part of the lifting pipe 1 with a mixer 2 is equipped with a gas separator 3, and the lower part is installed in the sump 4 with a hydraulic mixture. The passive nozzle 7 of the pipeline 5 with the ejector 6 is connected. Through the pipeline 8 with the gas separator 3. One end of the pulse pipeline 9 is connected. with the nozzle 7, the other is installed at the level of the slurry in the sump 4, the presence of the pipeline 9 provides the connection-; 7 nozzle with the atmosphere. Stabilizing the pressure of the injected flow at the level of atmospheric pressure allows stabilizing the mode of operation. 1 il.

Description

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The invention relates to pump construction J, in particular, to the design of a gas-lift unit, and can be used in the energy industry of metallurgy and the mining industry.

The aim of the invention is to reduce environmental pollution by bypassing gases through the sump to prevent its overflow and to stabilize the operation mode when the pressure of the active gas flow in front of the ejector is increased by sucking air from the atmosphere.

The drawing shows a diagram of the gas lift installation.

The gas-lift unit contains a lifting pipe 1 with a mixer 2, the upper part of which is equipped with a gas separator 3, and the lower part is installed in a sump 4 with a hydraulic mixture, and a gas pipeline 5 with an ejector b, the passive nozzle 7 of which is connected via a pipeline 8 with a gas separator 3, and the installation is equipped pulse pipeline 9, one end of which is connected to the passive nozzle 7 of the ejector 6e and the other is installed at the level of the slurry in the sump 4,

Gaslift installation works as follows

When starting the gas-lift unit, the working gas supplied to the ejector 6 captures the air5 located in the pipeline 8 and the gas separator 3. The gas-air mixture produced in the electric sector 6 is fed through the gas pipeline 5 to the mixer 2, where the slurry is transported and transported. The mixture formed as a result of mixing enters the lifting pipe 1 into the gas separator 3, from where the hydraulic mixture is removed for its intended purpose, and the uncondensed gas through pipe 8 enters the passive nozzle 7 of the ejector 6j where it is trapped by the working gas and again injected into the mixer 2. The cycle is repeated.

Thus, the device operates in steady-state mode j during which the communication of the passive nozzle 7 with the atmosphere through the pulse conduit 9 is absent. Aggressive gases are not emitted to the environment.

The violation of the steady state mode of operation of the gas lift installation occurs when the working pressure of the gas at the entrance to the ejector 6 changes.

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When the working pressure at the inlet to the ejector 6 decreases, a mode occurs characterized by a decrease in the supply of the ejector 6 and a decrease in the proportion of the working stream in the mixture. The gas lift supply decreases, causing an increase in the geometric lift of the gas lift, resulting in an increase in the compression pressure developed by the ejector 6.

With a constant working pressure with increasing pressure, the injection coefficient decreases, and hence the flow rate of the injected flow decreases, i.e. The amount of suction from the separator 3 through the pipeline 8B passive nozzle 7 of the gas mixture is reduced. This leads to an increase in the pressure of the injected flow in the gas separator 3, the pipeline 8, the passive nozzle 7, which causes an increase in the injection coefficient of the ejector b, and therefore an increase in the fraction of the injected flow. The presence of the impulse piping 9 makes it possible to prevent the release of aggressive gases into the service area of the installation. With an increase in the immersion of the mixer 2, the end of the pipeline 10, driven into the sump, is submerged below the level of the slurry. At a certain pressure increase in the gas separator 3, the pipeline 8, a part of the gas flow is discharged through the impedance pipe 9.

Moreover, the aggressive gas, the passage through the column of the slurry to the depth of which the pipeline 9 is immersed, is cleared of agglomerative components, thus preventing environmental pollution.

When the pressure of the working gas is increased at the initial moment of time, the compression pressure of the ejector 6, determined by the geometric depth of the gas lift, remains constant, as a result of which the productivity of the ejector 6 increases. With a constant inflow of the slurry and an increase in the flow rate of the working fluid to the gas lift, the geometric immersion of the mixer 2 decreases. Consequently, the required pressure of the ejector 6 also decreases, which leads to an increase in the injection coefficient and an increase in the amount of the injected stream sucked from the separator 3. The pressure in the gas separator 3 decreases,

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those. the pressure of the injected stream is reduced.

Equipping the ejector 6 with pipeline 10 allows stabilizing the mode of operation of the gas-lift unit, due to the fact that one end of the pulse pipeline 9 is installed in the sump 4 at the level of the slurry mirror. As the pressure of the working gas increases, the level of the slurry in the sump 4 decreases, hence the impulse line 9 communicates with the atmosphere. Further development of the process leads to a decrease in the injected flow. In the absence of the impulse piping 9, this leads to an emergency.

The presence of the impulse piping 9 provides in this case the connections of the passive nozzle 7 of the ejector 6 with the atmosphere.

Stabilizing the pressure of the injected flow at the level of the atmospheric pressure allows stabilizing the operating mode of the ejector b gas

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elevator, and hence the entire installation as a whole.

Claims (1)

Formula Eteni A gas-lift installation containing a lifting pipe with a mixer, the upper part of which is equipped with a gas separator, and the lower one is installed in a sump with a hydraulic mixture, and a gas pipeline with an ejector, a passive nozzle, which is connected by means of a pipeline with a gas separator, characterized in that environment by bypassing the gas through the sump when it overflows and stabilize the mode of operation when the pressure of the active gas flow in front of the ejector increases by sucking air from the atmosphere; the wife of the impulse piping, one end of which is connected to the passive nozzle of the ejector, and the other is installed at the level of the slurry mirror in the sump. L Steam