RU2464448C2 - Complete modular turbocompressor plant for transportation of hydrocarbon gas - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: complete modular turbocompressor plant for transportation of hydrocarbon gas refers to oil and gas industry and can be used in oil and gas industry at development of gas and oil deposits the operation of which is accompanied with essential change of pressure and flow rate of gaseous hydrocarbon mixture. Plant consists of multi-housing centrifugal compressor with gas-turbine or electric drive with or without multiplying gear, process circuit equipped with pipelines, shutoff and control valves, as well as transmitters of automatic plant control system; besides, process circuit has linear arrangement, and compression stages of multi-housing centrifugal compressor are equipped with air cooling devices and separators. Compression stages of centrifugal multi-housing compressor can be connected to process circuit in series or in parallel; in addition, process circuit is equipped with cross pieces, shutoff and control valves, transmitters of automatic plant control system, and rotary system of centrifugal multi-housing compressor is equipped with false shaft installed in pedestal bearings of the first compression housing.

EFFECT: increasing the use efficiency of compressor equipment used for collection and transportation of hydrocarbon gas at its supply for processing or to main gas line.

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Description

The invention relates to the field of oil and gas engineering and can be used in the gas and oil industry in the development of gas or oil fields, the operation of which is accompanied by a significant change in pressure and flow rate of the gaseous hydrocarbon mixture.

A known design of a compressor unit (KU) for collecting and transporting hydrocarbon gas, the basis of which is a multi-case (multi-stage) centrifugal compressor (CC) with an electric or gas turbine drive [declaration patent of Ukraine No. 32820, priority 04.05.1998, publ. 02/15/2001, Bull. No. 1]. Each compression stage of such a compressor unit has a section (body) for compression of the central control unit, an air compression unit (ABO), and also a separator for separating a two-phase hydrocarbon mixture, which is formed after gas cooling in the ABO. The characteristics of the first compression stage of the Central Committee are selected based on the required installation performance, pressure, temperature and thermodynamic properties of the gas at the inlet of the Central Committee. The characteristics of subsequent compression stages are calculated based on the technological features of the gas compression process and operating requirements.

The closest to the claimed invention in terms of purpose, technical essence and the results achieved is selected as a prototype KU for the collection and transport of hydrocarbon gas (V.P. Parafeinik, Thermodynamic efficiency and design features of hydrocarbon mixture separators for compressor units in the oil industry // Chemical and Petroleum Engineering No. 4, 1996. p. 42-47). The installation contains a slotted inlet separator and successively one after three compression stages in the central control unit, each of which has one after one air cooling apparatus and a slotted separator.

A disadvantage of the known design is the generally accepted linear arrangement of the technological circuit (strapping) of the control unit, which allows its effective operation only with a constant or insignificant change in the input pressure. With a significant change in the gas pressure at the inlet to the KU, in order to ensure its effective operation, it is necessary to replace the CC housings as part of separate compression stages or flow parts inside the separate compressor compression housings, which is not always an effective solution for a significant change in the gas parameters at the KU inlet.

When creating a new KU, it became necessary to ensure its effective operation during the entire period of operation with minimal material costs. Figure 1 shows a possible change in pressure and flow rate at the inlet to the installation, and Figures 2-4 show possible schemes for connecting the compression housings of the central heating system under various conditions of inlet.

The basis of the invention is the task of improving the layout of the technological circuit (strapping) KU for the collection and transportation of hydrocarbon gas in order to increase the efficiency of use of compressor equipment.

The purpose of the invention is to increase the efficiency of use of compressor equipment used for the collection and transportation of hydrocarbon gas when it is supplied for processing or the main gas pipeline.

The problem is solved due to the fact that the block-complete turbocompressor installation for hydrocarbon gas transportation, consisting of a multi-case centrifugal compressor with a gas turbine or electric drive with or without a multiplier, a technological circuit equipped with pipelines, shut-off and control valves, as well as sensors of the automated control system installation; moreover, the technological circuit has a linear layout, and the compression stages of a multi-case centrifugal compressor are equipped with air-cooling units and separators. In addition, the compression stages of a multicase centrifugal compressor can be connected in series or in parallel to the technological circuit, the technological circuit is additionally equipped with jumpers, shutoff and control valves, sensors of the automated control system of the installation, and the rotor system of the multicase centrifugal compressor has a false shaft, which is installed in the thrust bearings of the first housing compression.

In the layout of the technological circuit (strapping) of the control unit in accordance with the invention, special pipe jumpers, shut-off and control valves are installed. The above improvements allow you to change the configuration of the circuit with separate, serial and parallel connection of the compression housings of the turbocompressor to ensure efficient operation of the installation with a significant change in gas pressure at the inlet during the entire period of operation.

Also, the rotor system of a multi-case centrifugal compressor has a false shaft, which is installed in the thrust bearings of the first compression casing and ensures the transfer of mechanical energy to the second compression casing during installation at the first stage of operation, when the technological parameters of the gas are provided by compressing it only in the second compression casing.

Due to the need to ensure efficient operation of the compressor unit with minimal costs during the entire period of operation, the design of the two-stage compressor, the technological circuit and the control system is made in such a way that separate compression housings of the low-pressure compressor (KND) and high pressure (KVD) can be connected to work in the composition of the control unit both individually and for sequential or parallel operation. To provide various options for connecting the compressor compression housings in the design of the technological circuit, special devices are provided for connecting (disconnecting) individual sections of the technological circuit of the control unit, special fittings, as well as the corresponding algorithms for controlling the operation of automated control (ACS), ensuring that the technological parameters of the control unit meet operational requirements.

The essence of the invention is explained by the presented scheme KU for the collection and transport of hydrocarbon gas (see figure 2-4).

Installation works as follows. Depending on the required final pressure or the pressure supplied to the KU input, the block-complete KU can be equipped with one, two or more compression stages, equipped with the required number of KND and KVD, respectively. The KU operation is ensured by the corresponding design of the technological circuit equipped with piping, shutoff and control valves, as well as self-propelled guns.

Figure 2 shows the connection diagram of the compression housings of the central turbocharger unit 12 when compressing gas only in the HPC 16. In this case, the mechanical energy from the turbine or electric drive 13 is supplied through the multiplier 14 to the false shaft of the rotor system of the central turbocharger unit 12 installed in the low pressure bearings 15. The compressed gas is supplied to the inlet of the HPC 16 through the bypass pipe (see FIG. 2), through an intermediate separator 8, which in this case functions as an inlet separator. The gas compressed in the HPC 16 to the required pressure is supplied for injection through two sections of the KU technological circuit: through a special jumper, with the disconnected disconnecting device 4, ABO 10 and the end separator 9; through the throttle device 6, ABO 11 and the end separator 9 into the discharge pipe.

When compressing gas only in HPC 16 (see figure 2) before starting operation, it is necessary:

- install plug-spacers (or shut-off valves) number 1, 3, 5;

- dismantle plugs-spacers (or shut-off valves) number 2, 4.

Only self-propelled guns 16 of the turbocompressor unit 12 are connected to the self-propelled guns. Anti-surge control is carried out only by the self-propelled guns 16.

Figure 3 presents the connection diagram for the sequential operation of the compression housings of the Central Committee of the turbocompressor unit 12 in KND 15 and KVD 16.

With a further drop in pressure at the inlet to the low pressure valve 15, the false shaft is dismantled, the flow section is installed in the compression housing, and the high pressure valve 16 is equipped with a new flow section, which ensures the required process parameters of the compressor unit during sequential operation of the low pressure sensor 15 and high pressure sensor 16 (Fig. 3). In this case, the bypass circuit is turned off using the shut-off device 2, and the compressed gas is supplied through the inlet separator 7 to the inlet of the low pressure switch 15. The gas compressed in the low pressure switch 15 through the air cooler 10 and the intermediate separator 8 (with the dismantled devices 1, 3, 5 and installed device 2, 4), is supplied for compression in the HPC 16 and then through the ABO 11 and the end separator 9 into the discharge pipe.

When the sequential operation of the buildings KND 15 and KVD 16 (see figure 3) of the turbocompressor unit 12 before operation is necessary:

- install plug-spacers (or shut-off valves) number 2, 4;

- dismantle the plug-spacers (or shut-off valves) number 1, 3, 5.

In the self-propelled guns are connected two buildings KND 15 and KVD 16 turbo-compressor unit 12. Anti-surge control can be carried out both in two buildings, and one KVD 16.

Figure 4 presents the connection diagram for the parallel operation of the compression housings of the Central Committee of the turbocompressor unit 12 in KND 15 and KVD 16.

With an even more significant drop in gas, new flow parts are installed in the KND 15 and KVD 16 compression housings, which ensures the required technological parameters of the KU. The configuration of the technological circuit and the control algorithms of the KU operation are changed in such a way as to ensure its effective operation when parallel connected to the technological circuit of KND 15 and KVD 16 (Fig. 4). In this case, the gas supply to the inlet of the low pressure switch 15 is carried out through the inlet separator 7, and in the high pressure switch 16 through the bypass pipeline with the dismounted disconnecting device 2 through the intermediate separator 8. The gas compressed in the low pressure switch 15 through a special jumper with the dismantled disconnecting device 3, ABO 10 and end separator 9, is fed into the discharge pipe. The gas compressed in the HPC 16 through the throttle device 6, ABO 11 and the end separator 9, is also fed into the discharge pipe of the technological circuit KU.

In parallel operation of the buildings KND 15 and KVD 16 (see figure 4) of the turbocompressor unit 12 before operation is necessary:

- install plug-spacers (or shut-off valves) number 4, 5;

- dismantle the plug-spacers (or shut-off valves) number 1, 2, 3.

In the self-propelled guns are connected two buildings KND 15 and KVD 16 turbocompressor unit 12. Anti-surge control is carried out only in two buildings.

Thus, the proposed design of the technological circuit (strapping) of the KU is more efficient compared to the prototype due to the use of special pipe jumpers, locking devices and fittings, as well as the configuration of the self-propelled guns, which allow changing the configuration of the circuit with separate, serial and parallel connection of the turbocharger compression cases for ensure the efficient operation of the installation with a significant change in gas pressure at the inlet during the entire period of operation, as well as the implementation of existing control algorithms for ACS.

Claims (1)

Block-complete turbocompressor installation for hydrocarbon gas transportation, consisting of a multi-body centrifugal compressor with a gas turbine or electric drive with or without a multiplier, a technological circuit equipped with pipelines, shut-off and control valves, as well as sensors of the automated control system of the installation; moreover, the technological circuit has a linear layout, and the compression stages of a multi-case centrifugal compressor are equipped with air coolers and separators, characterized in that the compression stages of a multi-case centrifugal compressor can be connected to the technological circuit in series or in parallel, the technological circuit is additionally equipped with jumpers, shutoff and control valves, sensors automated control systems for the installation, and the rotor system of the multi-body centrifuge Nogo compressor equipped falshvalom mounted in support bearings of said first body compression.

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