Compression unit

FIELD: machine building.

SUBSTANCE: compressor unit (1) comprises a compressor (5), a suction line (2) and a return line (3), a block (20) that controls the compressor (5). Moreover, in line (2) the suction is ensured by at least one device (21, 22) to detect amounts of non-gaseous fluid medium in the fluid to be compressed, on their way to the entrance to compressor (5), and detection device (21, 22) is connected to management block (20) ensuring signal transmission, and compressor unit (1) contains dissolution unit (30), which dissolves the amount of non-gas on its way to the entrance of compressor (5), while the dissolution is initiated when the amount of detected non-gaseous fluid exceeds a certain limit.

EFFECT: any damage caused by a number of non-gaseous fluid into the suction inlet to the compressor is excluded.

7 cl, 1 dwg

 

The invention relates to a compressor installation with a compressor, a suction line and a discharge line, with the control unit, which controls the operation of the compressor and/or neighboring modules. In addition, the invention relates to a method of actuation of the compressor, this compressor unit refers to the previously mentioned type.

Recent advances, particularly in the development of natural gas fields, focused on the compression of natural gas below sea level, directly at the wellhead. These achievements are very interesting from an economic point of view, as on offshore platforms excessively high costs for operational staff. In the future, the compression of natural gas under water can make offshore platforms excessive.

However, these current advances are accompanied by serious technical problems associated with difficult operational conditions and poor access to compressor installations. The main problems are the low temperatures near the freezing point, high ambient pressure, corrosive sea water, untreated and chemically aggressive fluid to be compressed, while natural gas, whose pressure on the suction changes, transfers significant amounts of postion the e particles and negatory fluids accordingly fluid. During the period of operation of the well, the pressure developed in the field of natural gas is significantly reduced. In accordance with the measures for the protection of the environment is not allowed to transfer media between the compressor unit and the environment.

In International patent application WO01/50024 A proposed position detection device in the suction line of the compressor to detect particles or the amount of fluid density measuring device and, accordingly, to change the operation of the compressor. However, this may not be enough, because large quantities of water can destroy the compressor when entering the impeller.

The invention is directed to solving the problem of the availability of large quantities of negators the fluid contained in the compressor. We already know the placement of the separator between the mouth of the well and compressor unit for separating describe not gas-induced fluid prior to its entry into the compressor. With the deletion of the excessive loss of pressure in the separator installation and maintenance installation within acceptable limits, the separator cannot be performed to cope with all possible number describe not gas-induced fluid medium, which may occur. On the other hand, the compressor unit can be destroyed with only one extreme case is estii, during which the separator will not be able to cope with negators fluid medium.

Therefore, one object of the invention is to create a piston compressor is protected from large quantities of negators the fluid in the suction line towards the entrance of the compressor, and the exclusion of any damage.

This problem is solved compressor unit of the previously mentioned type in which the suction line is provided with at least one detection device for detection negatory quantities of fluid to be compressed, on the way to the entrance of the compressor, and that the detecting device is connected to the control unit by transmitting the signals.

Placement detection device allows the control unit to respond depending on the condition of the fluid in the suction line.

The detecting device can be any device that is able to recognize negatory quantity in the suction line. Detection can be carried out, for example, an optical sensor or acoustic, in particular ultrasonic sensor. Preferably, the detection was limited to the detection of liquids, but it can also be configured on the recognition of solid objects.

One advantageous possibility of reaction block upravleniya detection negatory quantities is to reduce the speed of the compressor, when the detected number of Nagase exceeds a certain limit. This specific limit should be lower than the quantity that can destroy the compressor, the compressor installation.

Another possibility, which is available as an option or in addition to the characteristic speed is the placement of the installation of dissolution, which dissolves the number of Nagase, in particular liquid, on their way to the entrance of the compressor. Preferably, the dissolution was initiated by the control unit, when the number of detected negate exceed a certain limit. To prevent damage to a certain limit should be below any critical value, which can be devastating for any known module. In particular, the installation of dissolution may contain a valve and, accordingly, the inkjet nozzle installed in the chamber of dissolution, the valve opens a path for the flow of the compressed fluid from an area of higher pressure level down to suction pressure in the chamber dissolution, which is located in the suction line. As soon as the detection unit detects the number negators fluid, which are subject to dissolution, the control unit opens the valve, and jet stream in the chamber dissolution dissolves regulatel the number of nagasa to smaller quantities which are not dangerous for the modules downstream.

In one implementation of the invention provides an electric motor which drives the compressor, which together with the compressor is enclosed in a gas-tight casing.

In another implementation of the invention provides a separator in the suction line between the mouth of the well and the compressor, the detection device can be installed upstream or downstream relative to the separator or on both sides.

The above-mentioned defining characteristics and other characteristics and advantages of the invention and the manner of attaining them will become more apparent and the invention itself will be best understood by reference to the following description considered currently the best implementation of the invention in conjunction with the accompanying drawing, on which:

Fig. 1 is a schematic view of the compressor unit, placed under water over the mouth of the well of natural gas and contains a suction line, discharge line and separator.

In Fig. 1 shows a compressor unit 1, containing the line 2 suction discharge line 3, the separator 4 and the compressor 5, located between line 2 suction and discharge line 3. Compressor unit 1 is installed below sea level 6 on the seabed 7. Beneath the seabed 7 is wells is in 8 natural gas feed line 9, leading to the mouth of the 10 wells. Above sea level 6 on the ground 11 installed equipment 12, which performs additional processing of the fluid 13, which represents natural gas 15, supplied by a compressor 5.

Natural gas 15 stored in the well 8 under pressure P1, is compressed by the compressor 5 to the pressure P2 and reaches 12 under pressure P3. Between the mouth 10 of the well and the compressor 5 has a separator 4 for purifying natural gas 15 from foreign particles and unwanted liquids. However, we cannot exclude that the quantity of fluid corresponding to the amounts of 17 Nagase, may exceed the capacity of the separator 4 and the critical number will be released from the separator 4 on their way to the compressor 5, which may deteriorate.

The compressor 5 is supplied with the unit 20 controls (BU), which is connected to the devices 21, 22 detection provided in the suction line 2. Devices 21, 22 detect detect the number of Nagata on their way to the entrance of the compressor 5. One device 21 detection installed directly on the mouth 10 of the well and another device 22 detection is installed between the separator 4 and the compressor 5. In addition, you can use only one device 21, 22 detected in any one of the places. However, the use of two devices 21, 22 detection gives more opportunities is the first to respond, if the number of negate or liquids. In this particular example, the block 20 control reduces the rotational speed of the compressor shaft 5, as soon as the first device 21 detection detects the number of Nagase exceed a certain limit.

Between the separator 4 and the compressor 5 behind the second device 22 of the detection provided by the camera 30 of dissolution, which is built for dissolving quantities of liquids on their way to the entrance of the compressor. The dissolution is carried out corresponding jet nozzle which emits a stream of natural gas with a higher pressure P2 discharged from the outlet line 3. In the line connected to the selection of the outlet line 3, there is a valve 31, which is controlled by the control block 20. If the second device 22 detection detects a critical number of Nagase, respectively, liquid, block 20, the control initiates the opening of the valve 31 and the stream exiting the nozzle under higher pressure P2 in the chamber of dissolution, dissolve critical number to get harmless small amounts of Nagase included in the compressor 5.

The compressor 5 is driven by the electric motor 40, which together with the compressor 5 is enclosed in a gas-tight casing 41, and the motor rotor and a compressor rotor connected to one shaft, support Emim not shown magnetic bearings. Line 50 of the power supply and the signal line 51 connecting surface equipment 12 with the control block 20 respectively of the compressor 1.

1. Compressor (1) compressor (5), line (2) suction and discharge line (3), unit (20) that controls the compressor (5), and line (2) suction provided by at least one device (21, 22) detection for recognition of quantities negators the fluid in the fluid to be compressed, on their way to the entrance of the compressor (5), and this device (21, 22) detection is connected to the block (20) management software transmitting signals, wherein the compressor unit (1) contains the installation (30) dissolution, which dissolves the number of Nagata on their way to the entrance of the compressor (5), and with the dissolution is triggered when the number of detected negators the fluid exceeds a certain limit.

2. Compressor unit (1) according to claim 1, characterized in that the unit (20) controls operating speed of the compressor (5) and is designed so that the operation speed is reduced when the number of detected negate exceeds a certain limit.

3. Compressor unit (1) according to claim 1, characterized in that the compressor (1) includes an electric motor (40), which together with whom is ressora (5) is enclosed in a gas-tight casing (41).

4. Compressor unit (1) according to claim 1, wherein the compressor unit (1) contains the separator (4) in line (2) suction, which is separating the number negators fluid from the fluid before the fluid enters the compressor (5).

5. Compressor unit (1) according to claim 4, characterized in that the device (21, 22) detection provided upstream and/or downstream relative to the separator (4).

6. The method of actuation of the compressor (1), containing the compressor (5), line (2) suction, discharge line (3) and unit (20) that controls the compressor (5), at least one device (21, 22) detection provided for detecting quantities negators the fluid in the fluid to be compressed, and this detection device connected with the provision of the transmission unit (20) controls, and this unit (20) control adjusts the compressor or neighboring modules as response to the detection of quantities negators the fluid in the fluid, characterized in that provide installation (30) dissolution, and the fact that the block (20) control initiates the dissolution amounts of Nagata on their way to the entrance of the compressor, when the device (21, 22) detection detects the number of Nagase exceeding particularly the th limit.

7. The method according to claim 6, characterized in that the block (20) control reduces the speed of the compressor (5), when the suction line is detected the number negators fluid that exceeds a certain limit.



 

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