RU2714589C1 - Controlled pressure raising system of low-pressure gas - Google Patents

Abstract

FIELD: transport of substances.

SUBSTANCE: invention relates to movement of fluids via pipelines, namely to low pressure gas transportation system, and can be used if it is necessary to change dynamic and flow characteristics of moved fluid, preferably, at change of flow rate and pressure of moved gas in pipeline. Proposed system comprises at least two parallel installed ejectors with different capacity, each of which is made with possibility of changing nozzle and mixing chamber. Active fluid bypass line control valve is installed parallel to ejectors, low-pressure gas line is connected to ejectors inputs by means of flange connections, as well as through shutoff valves and angular bends to ejectors inputs high-pressure medium line is connected, which is also connected through shutoff valve to inlet of said control valve, outputs of ejectors and said control valve through shutoff valves are connected to mix discharge main line.

EFFECT: technical result achieved when implementing the developed technical solution consists in enabling deep control of system operation both by active gas flow rates and pressures with simultaneous facilitation of system readjustment.

12 cl, 1 dwg

Description

The invention relates to the field of moving fluids through pipelines, and in particular to a low pressure gas transportation system, and can be used if necessary to change the dynamic and flow characteristics of the moving fluid, preferably when the flow rate and pressure of the transported gas in the pipeline change.

Gas ejectors are used to raise the pressure of a low-pressure gas using high-pressure gas. Because the flow of active or passive gas can vary within wide limits, then the same principle is used as with nozzles. Instead of one ejector, several ejectors with different capacities are installed. One ejector can adjust within ± 10% of the nominal value of the active or passive flow. All this applies to liquid gas ejectors, which are used, for example, to compress gas in the gas industry or to create a vacuum in columns at refineries.

There is a known (RU, patent 2140582, publ. 10.27.99) method for pumping gas from a disconnected section of a gas pipeline, including supplying gas to an ejector nozzle and pumping gas out of a disconnected section of a gas pipeline by this ejector.

The disadvantage of the described method is that the ejector system must contain redundant elements that allow for its reconfiguration. In any case, the performance of the ejector system at the final stage of pumping (for example, at a pressure in the working string of 4.5 MPa, and a residual pressure in the pumped out section of 0.3 MPa, even the theoretical coefficient of ejection K _E = 0.05) will be extremely low, so that in a real reasonable time, complete pumping will fail. In this regard, although the method described in principle is feasible, it is not currently used in gas pipeline repair practice.

It is known (SU, patent No. 1721387, publ. 23.03.1992) a gas control device that is part of a gas distribution station containing an inlet and outlet line, between which a shut-off valve, a filter, a flow meter, a gas pressure regulator, a safety valve assembly and an odorization unit are sequentially installed gas.

In this device, gas through a high pressure pipeline enters the process unit, at the inlet of which a shut-off valve with pneumatic actuator is installed, which serves to shut off the station in emergency cases. Then the gas is cleaned of impurities and condensate in the filter and sent through the metering unit to the gas pressure regulator, where pressure is reduced (reduced) to a predetermined value. After reduction, the gas passes through the safety valve assembly, which is triggered when a certain pressure is exceeded. Then the gas passes through the odorization block, where it undergoes odorization. The gas collected in the collector, coming from all of the above nodes, is sent to the ejector into the mixing chamber, while gas is supplied to the ejector nozzle from the inlet pipe. The ejected gas then goes to the consumer.

A disadvantage of the known technical solution should recognize its complexity.

Known (SU, copyright certificate No. 1239478, publ. 06.23.1986) gas distribution station designed to reduce the gas pressure of the main gas pipeline and containing high and low pressure manifolds with a turbogenerator between them, connected through a backup and compensation lines with control valves, an ejector included between the collectors and the mixing chamber connected to the generator cooling line, and the station further comprises a reactor connected at the inlet to the high pressure manifold, and output - through the throttle to the mixing chamber of the ejector.

A disadvantage of the known technical solution should be recognized as the impossibility of changing the flow characteristics of low- and high-pressure gaseous or liquid mediums moved through the pipeline.

The technical problem solved by the use of the developed system is to develop an improved technical solution used for the controlled raising of the low-pressure gas pressure.

The technical result achieved by the implementation of the developed technical solution is to provide the possibility of deep regulation of the system, both in terms of active gas consumption and pressure, while facilitating the reconfiguration of the system.

To achieve the specified technical result, it is proposed to use the developed system of controlled pressure raising of low-pressure gas. The developed system contains at least two parallel mounted ejectors, each of which is capable of changing the nozzle and mixing chamber, while ejectors with different capacities are used, in addition to the ejectors, an additional control valve for the bypass of the active medium is additionally installed to the inputs of the ejectors via flange connections a low-pressure gas line is connected, and a high-pressure medium line is connected through shut-off valves and angle taps to the ejector inputs, Connecting and through the shutoff valve to the input of said control valve, whose output is connected to the output highway mixture and the outlet of the ejector and the said control valve through check valves connected to the outlet line of the mixture.

The system in some embodiments contains more than two ejectors.

The performance of the ejectors used in conjunction with the specified control valve provides a change in the flow rate of active gas from 10 to 100%.

The system may include both manually adjustable valves and a valve, and automatically controlled valves and a valve.

In some embodiments, the system may further comprise means for monitoring the pressure, flow rate and temperature of the active gas, passive gas and gas mixture at the outlet of the ejector block.

The system may also additionally contain an automatic control unit for all parameters and pressure control in the line with a control valve, configured to automatically control all shut-off valves (the inputs of which are connected to low-pressure gas pressure control devices, and the unit outputs are connected to shut-off valves that are automatically controlled.

Also, to achieve the specified technical result, a developed method of controlled pressure raising of a low-pressure gas can be used. According to the developed method, at its implementation, at least two parallel mounted ejectors with different capacities are used, each of which is configured to change the nozzle and mixing chamber, a control valve for the active fluid bypass line is installed in parallel with the ejectors, and connected to the inputs of the ejectors by means of flange the low-pressure gas line, as well as the high-pressure medium line, through the shut-off valves and corner bends to the ejector inputs Modes also connected through a check valve to the inlet of said regulating valve, wherein the outlet of the ejector and the said control valve through check valves connected to the outlet line of the mixture.

For the convenience of replacing the nozzle chamber and the mixing chamber, the inlet of the active gas is made at an angle of 90 ° to the axis of the ejector.

In some embodiments of the method, more than two parallel ejectors are used.

When implementing the method, both manually adjustable valves and a valve and automatically controlled valves and a valve are used.

In some embodiments of the method, additional means are used to control pressure, gas flow and temperature on all or separate streams.

Also, in some embodiments of the method, automatic control of shut-off valves is used depending on the gas parameters.

The block diagram of the developed system is shown in the figure, with the following notation: the passive (low-pressure) gas supply line 1; line supply of active (high-pressure) gas or liquid 2; mixture yield 3; ejectors 4, 5, 6, the control valve of the bypass line of the active gas or liquid 7, shut-off valves 8, flanges 9, angle bend 10.

The developed technical solution is based on the use of ejectors for raising the pressure of a low-pressure fluid using a high-pressure fluid, in particular gas.

The developed technical solution works as follows. Passive (low-pressure) gas enters the ejectors through line 1. Active (high-pressure) gas or liquid enters through the line 2. Passive and active flows exit together through line 3. The ejectors are turned on or off by shut-off valves 8. The control valve 7 is turned on by the same valves. through which, if necessary, excess active gas is discharged.

If the pressure of the active, passive gas or the pressure at the outlet of the ejectors changes, the nozzle and mixing chamber are changed (i.e., preliminary calculation is made and the nozzle and mixing chamber are installed with a different geometry). Replacement of flowing parts can be carried out both on one and on all ejectors of the block of ejectors.

Technically, this is convenient to do by connecting the ejector to the active gas through an angle bend 10 and using a flange connection. Separating the flanges at the outlet 10 first, they gain access to the ejector nozzle with the possibility of its replacement. Further, separating the remaining flanges, they change the mixing chamber of the ejectors. Thus, a deep regulation of the system, both in terms of active gas consumption and pressure, is provided.

Claims (12)

1. The system of adjustable pressure raising low-pressure gas, characterized in that it contains at least two parallel mounted ejectors, each of which is made with the possibility of changing the nozzle and the mixing chamber, using ejectors with different capacities, parallel to the ejectors is additionally installed regulating valve of the bypass line of the active medium, a low-pressure gas line is connected to the inputs of the ejectors via flange connections, as well as through shut-off valves and angle openings s ejectors connected to the inputs of the high-pressure medium line, connected also through a check valve to the inlet of said control valve and said ejector outputs the control valve through check valves connected to the outlet line of the mixture. 2. The system according to p. 1, characterized in that it contains more than two ejectors. 3. The system according to claim 1, characterized in that manually controlled valves and a valve are used. 4. The system according to claim 1, characterized in that the automatically controlled valves and valve are used. 5. The system according to claim 1, characterized in that it further comprises means for monitoring the pressure, flow rate and temperature of the active gas, passive gas and gas mixture at the outlet of the ejector block. 6. The system according to claim 1, characterized in that it further comprises a unit for automatically controlling the pressure, flow rate and temperature of the active gas, passive gas and gas mixture at the outlet of the ejector block, configured to automatically control shut-off valves and a control valve. 7. A method of adjustable raising the pressure of a low-pressure gas, characterized in that at least two parallel-mounted ejectors with different capacities are used, each of which is configured to change the nozzle and the mixing chamber, a control valve for the bypass of the active fluid is installed in parallel with the ejectors, moreover, the low-pressure gas line is connected to the inputs of the ejectors by means of flange connections, as well as m are connected to the inputs of the ejectors through shut-off valves and angular outlets gistral high pressure medium in addition also connected through a check valve to the inlet of said regulating valve, wherein the outlet of the ejector and the said control valve through check valves connected to the outlet line of the mixture. 8. The method according to p. 7, characterized in that more than two ejectors are used in parallel with the installed ejectors. 9. The method according to p. 7, characterized in that they use manually adjustable valves and a valve. 10. The method according to p. 7, characterized in that they use automatically controlled valves and valve. 11. The method according to p. 7, characterized in that it additionally uses means to control the pressure, flow and temperature of the active gas, passive gas and gas mixture at the outlet of the ejector block. 12. The method according to p. 7, characterized in that they use automatic control of shut-off valves, taking into account the control of pressure, flow and temperature of the active gas, passive gas and gas mixture at the outlet of the ejector block.

Images