JP2016023452A - Compressor system, submarine production system provided with the same, and cleaning method for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor system that allows stable cleaning of a compressor.SOLUTION: A compressor system includes: a compressor 50 for compressing gas; a compressed gas circulating part 52 where the gas compressed by the compressor 50 circulates; a hydrate antifreezing agent feeding part 53 that feeds a hydrate antifreezing agent to the compressed gas circulating part 52, the hydrate antifreezing agent suppressing conversion of the gas into hydrate; a compressor hydrate antifreezing agent feeding part 54 that feeds a part of the hydrate antifreezing agent fed by the hydrate antifreezing agent feeding part 53 to the compressor 50; and a pressure change part 59 that changes pressure of the hydrate antifreezing agent inside the compressor 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a compressor system, an undersea production system including the compressor system, and a compressor cleaning method.

  In an undersea production system that mines seabed resources, production fluids containing crude oil and natural gas are pumped from production wells that have been drilled to a depth of several thousand meters from the seabed. In the undersea production system, the pumped production fluid is separated into a gas such as natural gas and a liquid such as crude oil by a separator such as a scrubber, and then sent to a ship on the sea via a flow line extending in the sea. At this time, in order to send a gas such as natural gas to a ship on the sea, a compressor installed on the seabed is used.

  In such a compressor installed on the seabed, deposits accumulate in the internal flow path through which natural gas circulates due to continuous operation. As a result, the flow rate of natural gas that can be circulated through the internal flow path is lowered, and the efficiency as a compressor is lowered.

  For such a compressor, for example, Patent Document 1 discloses a cleaning method in which a part of condensate, which is a hydrocarbon contained in a liquid separated by a separator, is supplied to the compressor for cleaning. In this compressor cleaning method, condensate decomposes and removes deposits to clean the internal flow path of the compressor.

International Publication No. 2013/185801

  However, since the above-described cleaning method uses the condensate collected from the production well, there is a possibility that a necessary amount of condensate cannot be stably collected from the production well. Therefore, there is a problem that it is difficult to stably clean the compressor.

  The present invention has been made to solve the above problems, and provides a compressor system capable of stably washing a compressor, an undersea production system including the compressor system, and a compressor system.

In order to solve the above problems, the present invention proposes the following means.
The compressor system according to the first aspect of the present invention includes a compressor that compresses a gas, a compressed gas circulation portion through which the gas compressed by the compressor circulates, and a hydrate antifreeze that suppresses hydration of the gas. Hydrate antifreeze supply part for supplying the agent to the compressed gas circulation part, and compressor hydrate for supplying a part of the hydrate antifreeze agent supplied by the hydrate antifreeze supply part to the compressor An antifreezing agent supply unit, and a pressure changing unit that changes the pressure of the hydrate antifreezing agent inside the compressor.

  According to such a configuration, the hydrate antifreeze supplied from the hydrate antifreeze supply unit to the compressed gas circulation unit in order to suppress hydration of the gas compressed by the compressor is deposited inside the compressor. The deposited deposits can be effectively removed. Furthermore, by utilizing a part of the hydrate antifreeze supplied from the hydrate antifreeze supply unit to the compressed gas circulation unit, a necessary amount of hydrate antifreeze is stably supplied to the compressor. be able to. Moreover, the hydrate antifreezing agent inside the compressor can be agitated by changing the pressure by the pressure changing unit with respect to the hydrate antifreezing agent inside the compressor. Therefore, the inside of the compressor can be cleaned using the hydrate antifreeze agent effectively.

  The compressor system may further include a gas discharge unit that discharges the gas inside the compressor, and the compressor hydrate antifreeze supply unit may be configured such that the gas is discharged by the gas discharge unit. In addition, the hydrate antifreeze may be supplied to the compressor.

  According to such a configuration, the hydrate antifreezing agent is supplied to the compressor and the pressure is changed at the pressure changing portion in a state where the gas is discharged and hardly remains inside. Therefore, it can suppress that the hydrate antifreeze supplied to the inside of a compressor is diluted with gas. Therefore, the hydrate antifreeze supplied from the compressor hydrate antifreeze supply unit can be efficiently used for cleaning the compressor, and the supply amount of the hydrate antifreeze can be suppressed.

  The compressor system further includes a storage unit that stores the hydrate antifreeze in the compressor, and the pressure change unit changes a pressure of the hydrate antifreeze stored by the storage. You may let them.

  According to such a configuration, in a state where the hydrate antifreeze agent is stored in the compressor in the storage unit, the hydrate antifreeze agent is efficiently used in the compressor by changing the pressure in the pressure change unit. Can be stirred. Therefore, the inside of the compressor can be cleaned using the hydrate antifreeze more effectively. Moreover, by washing without discharging the hydrate antifreeze from the compressor, the amount of hydrate antifreeze supplied to the compressor can be reduced and the compressor can be washed.

  In the compressor system, the supply control for starting the supply of the hydrate antifreezing agent to the compressor to the compressor hydrate antifreeze supplying unit when a predetermined condition is satisfied. You may provide the control part which performs.

  According to such a configuration, by controlling the supply of the hydrate antifreeze by the control unit, the hydrate antifreeze can be supplied in a limited manner to a compressor that requires cleaning. . Therefore, the hydrate antifreeze supplied from the compressor hydrate antifreeze supply unit can be efficiently used for cleaning the compressor, and the supply amount of the hydrate antifreeze can be further suppressed.

  Further, in the compressor system, the control unit determines whether or not a difference between the characteristic values of the gas between the inlet side of the compressor and the outlet side of the compressor satisfies a predetermined first criterion. When the first reference determination unit and the first reference determination unit determine that the first reference is satisfied, the compressor hydrate antifreeze supply unit is supplied to the compressor. A supply start instruction unit that sends an instruction to start the supply of the hydrate antifreeze agent.

  According to such a configuration, by calculating the difference from the characteristic value of the gas on the inlet side and the outlet side of the compressor, and determining by comparing with the first reference predetermined by the first reference determination unit, It can be easily estimated whether or not the compressor is in a state that requires cleaning. And a supply start instruction | indication part starts supply of the hydrate antifreezing agent to a compressor based on a determination result, and can wash | clean a compressor. Therefore, it can be determined with high accuracy whether or not the compressor is in a state requiring cleaning, and the hydrate antifreeze can be supplied more limitedly. As a result, the hydrate antifreeze can be supplied more efficiently from the compressor hydrate antifreeze supply unit to the compressor that requires cleaning, and the supply amount of the hydrate antifreeze can be further increased. It can be further suppressed.

  The compressor system includes a heating unit that heats the hydrate antifreeze, and the compressor hydrate antifreeze supply unit compresses the hydrate antifreeze heated by the heating unit. You may supply to a machine.

  According to such a structure, a high temperature hydrate antifreeze can be supplied to a compressor by providing the heating part. By being heated to a high temperature, the solubility of the hydrate antifreeze in the deposit can be improved. Therefore, the dissolution rate of the deposit accumulated in the compressor can be improved and the compressor can be cleaned effectively.

  The compressor system further includes a heating unit that heats the hydrate antifreeze, and the control unit starts supplying the hydrate antifreeze to the compressor, and then A difference between the characteristic value of the gas on the inlet side and the outlet side of the compressor is determined by a second reference determination unit that determines whether or not the second reference determination unit satisfies a predetermined second reference; When it is determined that the second standard is satisfied, the compressor hydrate antifreeze supplying unit is instructed to supply the compressor with the hydrate antifreeze heated by the heating unit. And a heating supply instruction section for sending

  According to such a configuration, the difference is calculated from the characteristic values of the gas on the inlet side and the outlet side of the compressor, and the second reference determination unit determines the comparison with the second reference, so that the compressor again. It can be easily estimated whether or not is in a state that requires cleaning. Therefore, for example, it is possible to easily estimate the state of the compressor that is different from the case of determination using the first reference. Then, based on the determination result, the heating supply instruction unit sends an instruction to supply the hydrate antifreeze agent heated by the heating unit to the compressor, whereby the hydrate antifreeze agent heated to a high temperature is supplied. Can be used to clean the compressor more effectively. Therefore, powerful cleaning can be performed on the compressor as needed. Thereby, when the compressor is in a state that requires strong cleaning, the heated hydrate antifreeze can be efficiently supplied, and the compressor can be cleaned more efficiently.

  The undersea production system according to the second aspect of the present invention includes the compressor system and a separator that separates the production fluid pumped from the production well into the gas and the liquid and supplies the gas and liquid to the compressor.

  According to such a structure, even if it is a compressor installed in the position where maintenance is difficult, such as the seabed, it can wash stably and efficiently. Therefore, clogging due to the deposit can be suppressed, and the gas can be stably sent to the gas by the compressor.

  The compressor cleaning method according to the third aspect of the present invention is a compressor cleaning method for cleaning a compressor that compresses gas, and a gas discharge step for discharging the gas inside the compressor; A part of the hydrate antifreeze agent that suppresses hydration of the gas supplied to the compressed gas circulation part through which the gas compressed by the compressor flows, and the compression of the gas discharged by the gas discharging step A compressor hydrate antifreeze supplying step for supplying to the machine, and a pressure changing step for changing the pressure of the hydrate antifreeze inside the compressor.

  According to such a configuration, in the compressor hydrate antifreeze supplying step, instead of preparing and supplying a new hydrate antifreeze, the hydrate antifreeze supplied to the compressed gas circulation section By utilizing a part, the required amount of hydrate antifreeze can be stably supplied to the compressor. Moreover, gas is discharged | emitted from the compressor outside at a gas discharge process. Therefore, in the pressure changing step, the pressure can be changed by the pressure changing unit with respect to the hydrate antifreezing agent inside the compressor while the gas is discharged and hardly remains inside. Therefore, it is possible to suppress the hydrate antifreeze supplied to the inside of the compressor from being diluted with gas and to stir the hydrate antifreeze inside the compressor. As a result, the inside of the compressor can be cleaned using the hydrate antifreeze agent effectively and efficiently. As a result, the supplied hydrate antifreeze can be efficiently used for cleaning the compressor, and the compressor can be stably and effectively cleaned while suppressing the supply amount of the hydrate antifreeze. Can do.

  The compressor cleaning method includes a storage step of storing the hydrate antifreeze in the compressor, and the pressure changing step includes a pressure of the hydrate antifreeze stored in the storage step. May be changed.

  According to such a configuration, in the storage process, the hydrate antifreeze agent is efficiently stored inside the compressor by changing the pressure at the pressure change unit while the hydrate antifreeze agent is stored inside the compressor. Can be stirred. Therefore, the inside of the compressor can be cleaned using the hydrate antifreeze more effectively. Moreover, by washing without discharging the hydrate antifreeze from the compressor, the amount of hydrate antifreeze supplied to the compressor can be reduced and the compressor can be washed.

  Further, in the compressor cleaning method, it is determined whether or not a difference between the characteristic values of the gas at the compressor inlet side and the compressor outlet side satisfies a predetermined first criterion. A first reference determination step, and a supply start step for starting supply of the hydrate antifreeze to the compressor when it is determined that the first reference is satisfied in the first reference determination step; , May be included.

  According to such a configuration, the compressor calculates the difference from the characteristic value of the gas on the inlet side and the outlet side of the compressor, and makes a determination in comparison with the first reference in the first reference determination step. It can be easily estimated whether or not the cleaning is required. Then, based on the determination result, the supply of the hydrate antifreeze agent can be started in the compressor in the supply start step, and the compressor can be cleaned. Therefore, it can be determined with high accuracy whether or not the compressor is in a state requiring cleaning, and the hydrate antifreeze can be supplied more limitedly. Thereby, it is possible to more efficiently supply the hydrate antifreeze supplied from the compressor hydrate antifreeze supplying unit to the compressor that requires cleaning, and supply of the hydrate antifreeze. The amount can be further suppressed.

  Further, in the compressor cleaning method, after the supply of the hydrate antifreeze to the compressor is started, the gas characteristic values on the inlet side of the compressor and on the outlet side of the compressor The second reference determination step for determining whether or not the difference between the second reference and the second reference satisfies a predetermined second reference, and when the second reference determination step determines that the second reference is satisfied, the second reference determination step is heated. A heating and supplying step of supplying the hydrate antifreeze to the compressor.

  According to such a configuration, the difference is calculated from the gas characteristic values on the inlet side and the outlet side of the compressor, and the compressor is again determined by comparing with the second reference in the second reference determining step. It can be easily estimated whether or not is in a state that requires cleaning. Therefore, for example, it is easy to estimate whether the state of the compressor is different from the case determined using the first reference (for example, whether more powerful cleaning is required for the compressor). Can do. And a compressor can be wash | cleaned more effectively by supplying the hydrate antifreeze which became high temperature by heating at a heating supply process based on the determination result to a compressor. Therefore, powerful cleaning can be performed on the compressor as needed. Thereby, when the compressor is in a state that requires strong cleaning, the heated hydrate antifreeze can be efficiently supplied, and the compressor can be cleaned more efficiently.

  According to the present invention, a compressor is efficiently cleaned by changing a pressure by supplying a part of the hydrate antifreeze agent supplied to the compressed gas circulation section through which the compressed gas flows. can do.

It is a mimetic diagram explaining an undersea production system in an embodiment of the present invention. It is a distribution diagram explaining a subsea module in an embodiment of the present invention. It is a block diagram explaining the control part in embodiment of this invention. It is process drawing explaining the washing | cleaning method of the compressor in embodiment of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 4.
The undersea production system 1 according to the embodiment of the present invention is a Subsea Production System that is one of the offshore oil and gas field development methods. As shown in FIG. 1, the undersea production system 1 is a production well W that collects a production fluid PF that mixes crude oil O, natural gas G, and the like mined from an oil and gas field F existing at several hundred to several thousand meters in the seabed. A manifold M that collects and branches the production fluid PF collected at the production well W, a flow line FL that is a pipe that conveys the production fluid PF branched by the manifold M, and a production fluid PF that is conveyed by the flow line FL. A subsea module SM that separates liquid and gas and sends them to the sea is provided. The undersea production system 1 includes a riser R that is a pipe that conveys crude oil O and natural gas G from the subsea module SM to the sea, an umbilical line AL that is a cable that supplies power to the subsea module SM, and the like. And a ship S for storing crude oil O and natural gas G, to which a riser R and an umbilical line AL are connected.

  The manifold M is installed in the vicinity of the production well W of the submarine oil and gas field F. The manifold M is a device that transports the mined production fluid PF to a plurality of flow lines FL by collecting and branching.

  The flow line FL is a pipeline that pumps the production fluid PF from the manifold M to the subsea module SM by the pressure energy of the oil and gas field F.

  The riser R extends from the subsea module SM on the seabed to the ship S on the sea. The riser R of the present embodiment includes an oil pipeline OR that conveys crude oil O sent from the subsea module SM to a storage tank (not shown) disposed on the marine vessel S, and a natural gas G sent from the subsea module SM. Is separately provided with a gas pipeline GR for conveying the gas to the storage tank. The riser R also has a pipeline AR for hydrate antifreeze that supplies hydrate antifreeze from the ship S to the gas pipeline GR that supplies natural gas G so that the natural gas G does not freeze due to hydrate formation on the sea floor. Is provided.

  The umbilical line AL is a composite cable having a power cable, a hydraulic cable, and a signal cable for controlling the subsea module SM. Electric power and signals from a generator (not shown) on the ship S are supplied to the subsea module SM and the manifold M. to be sending.

  The subsea module SM separates the production fluid PF supplied via the flow line FL into a gas and a liquid, and pumps the gas and the liquid, respectively. As shown in FIG. 2, the subsea module SM of the present embodiment gasses the main heat exchanger 2 that cools the production fluid PF pumped up from the production well W and the production fluid PF that is cooled by the main heat exchanger 2. And a separator 3 for separating the liquid into the liquid, a pump system 4 for sending the liquid separated by the separator 3 to the riser R, and a compressor system 5 for sending the gas separated by the separator 3 to the riser R.

  The main heat exchanger 2 cools the high-temperature production fluid PF pumped from the production well W and sent through the flow line FL to a temperature that can be used by the separator 3. The main heat exchanger 2 of the present embodiment cools the production fluid PF by exchanging heat with low-temperature seawater on the seabed.

  The separator 3 separates the production fluid PF into natural gas G that is a gas and crude oil O that is a liquid. The separator 3 of this embodiment is a scrubber and separates natural gas G and crude oil O containing condensate from the production fluid PF. The separator 3 sends the separated crude oil O to the pump system 4. The separator 3 sends the separated natural gas G to the compressor system 5.

  The pump system 4 compresses the crude oil O sent from the separator 3 and sends it to the oil pipeline OR. As shown in FIG. 2, the pump system 4 includes a pump 41 that compresses crude oil O, a liquid circulation part 42 that sends the crude oil O from the separator 3 to the pump 41, and a compressed liquid in which crude oil O compressed by the pump 41 circulates. A distribution unit 43.

The pump 41 compresses the sent crude oil O and sends it out.
The liquid circulation unit 42 supplies the crude oil O from the separator 3 to the pump 41. Specifically, the liquid circulation part 42 of this embodiment is a pipe connected from the separator 3 to the pump 41, and the crude oil O circulates inside.
The compressed liquid circulation unit 43 sends the crude oil O compressed by the pump 41 to the oil pipeline OR. Specifically, the compressed liquid circulation part 43 of the present embodiment is a pipe connected from the pump 41 to the oil pipeline OR, and the crude oil O compressed inside circulates.

  The compressor system 5 compresses the natural gas G sent from the separator 3 and sends it to the gas pipeline GR. As shown in FIG. 2, the compressor system 5 includes a compressor 50 that compresses the natural gas G, a gas flow part 51 that sends the natural gas G from the separator 3 to the compressor 50, and the natural gas compressed by the compressor 50. And a compressed gas circulation part 52 through which the gas G circulates. Further, the compressor system 5 includes a hydrate antifreeze supply unit 53 that supplies a hydrate antifreeze agent that suppresses hydration of the natural gas G to the compressed gas circulation unit 52, and a hydrate antifreeze supply unit 53. A compressor hydrate antifreeze supplying unit 54 for supplying a part of the supplied hydrate antifreeze to the compressor 50 and a heating unit 55 for heating the hydrate antifreeze are provided. Furthermore, the compressor system 5 includes a storage unit 56 that stores the hydrate antifreeze agent inside the compressor 50, and a bypass supply unit 57 that bypasses the compressor 50 and supplies the natural gas G to the compressed gas circulation unit 52. The gas discharge unit 58 that discharges the natural gas G inside the compressor 50, the pressure change unit 59 that changes the pressure of the hydrate antifreeze agent inside the compressor 50, and the compressor hydrate antifreeze supply unit 54 And a control unit 60 that performs supply control for starting supply of the hydrate antifreeze agent.

  The compressor 50 compresses and sends out the natural gas G supplied from the gas flow part 51 arranged on the upstream side in the flow direction of the natural gas G to the compressed gas flow part 52 arranged on the downstream side. The compressor 50 of this embodiment is a multistage centrifugal compressor provided with a plurality of impellers.

  The gas circulation part 51 supplies the natural gas G from the separator 3 to the compressor 50. Specifically, as shown in FIG. 2, the gas circulation part 51 of this embodiment is piping connected from the separator 3 to the compressor 50, and the natural gas G distribute | circulates the inside. The gas flow unit 51 of the present embodiment has an inlet side characteristic value measuring unit 511 that measures the characteristic value of the natural gas G on the inlet side of the compressor 50.

  The inlet side characteristic value measuring unit 511 measures the characteristic value of the natural gas G flowing into the compressor 50. The inlet side characteristic value measuring unit 511 is provided in the vicinity of the inlet of the compressor 50 of the gas circulation unit 51. The inlet side characteristic value measuring unit 511 of the present embodiment is a pressure sensor that measures a pressure value as a characteristic value. The inlet side characteristic value measuring unit 511 transmits the measured pressure value of the natural gas G to the control unit 60.

  The compressed gas circulation unit 52 sends the natural gas G compressed by the compressor 50 to the riser R. Specifically, the compressed gas circulation part 52 of this embodiment is piping connected from the compressor 50 to the gas pipeline GR, and the natural gas G compressed inside circulates. The compressed gas circulation unit 52 of the present embodiment has an outlet side characteristic value measuring unit 521 that measures a characteristic value of the natural gas G that is a gas on the outlet side of the compressor 50.

  The outlet side characteristic value measuring unit 521 measures the characteristic value of the natural gas G flowing out from the compressor 50. The outlet side characteristic value measuring unit 521 is provided in the vicinity of the outlet of the compressor 50 of the compressed gas circulation unit 52. The outlet side characteristic value measuring unit 521 of the present embodiment is a pressure sensor that measures a pressure value as a characteristic value, like the inlet side characteristic value measuring unit 511. The outlet side characteristic value measuring unit 521 transmits the measured pressure value of the natural gas G to the control unit 60.

  The hydrate antifreeze supplying unit 53 distributes the hydrate antifreeze supplied from the marine vessel S through the hydrate antifreeze pipeline AR to the compressed gas circulation unit 52. The hydrate antifreeze supply unit 53 of this embodiment is a pipe connected to the compressed gas circulation unit 52 from the hydrate antifreeze pipeline AR, and the hydrate antifreeze circulates inside. The hydrate antifreeze supply unit 53 is connected to the downstream side of the position where the outlet side characteristic value measurement unit 521 of the compressed gas circulation unit 52 is provided. In addition, as the hydrate antifreeze of this embodiment, it is preferable to use a fluid having lipophilicity or hydrophilicity. As the hydrate antifreeze, for example, it is particularly preferable to use monoethylene glycol which is used for preventing the hydrate formation of the natural gas G and suppressing the hydrate formation.

  The compressor hydrate antifreeze supply unit 54 supplies a part of the hydrate antifreeze flowing through the hydrate antifreeze supply unit 53 to the compressor 50. Specifically, the compressor hydrate antifreeze supply unit 54 of this embodiment includes a supply pipe 541 branched from the hydrate antifreeze supply part 53 and a flow of the hydrate antifreeze flowing through the supply pipe 541. A supply valve 542 to be adjusted.

  The supply pipe 541 branches from the hydrate antifreeze supply unit 53 and is connected to the gas circulation unit 51. Specifically, the supply pipe 541 of the present embodiment is connected to the gas flow unit 51 at a position upstream of the inlet-side characteristic value measurement unit 511 and downstream of the first flow valve 561 described later. ing.

  The supply valve 542 adjusts the supply of the hydrate antifreeze to the inside of the supply pipe 541. Specifically, the supply valve 542 of this embodiment stops the supply of the hydrate antifreeze agent into the supply pipe 541 by being closed. When the supply valve 542 is opened, the supply of the hydrate antifreeze into the supply pipe 541 is started. The supply valve 542 is an electromagnetic valve whose opening and closing operations are controlled by the control unit 60.

  The heating unit 55 is provided in the compressor hydrate antifreeze supplying unit 54 and heats the hydrate antifreeze. The heating unit 55 of the present embodiment is provided at a position where the supply pipe 541 and the liquid circulation part 42 intersect on the downstream side of the supply valve 542 of the supply pipe 541. When the signal is input from the control unit 60, the heating unit 55 uses the heat of the crude oil O flowing through the pump system 4 to heat the hydrate antifreeze. Specifically, the heating unit 55 heats monoethylene glycol, which is a hydrate antifreeze agent flowing in the supply pipe 541 at an ambient temperature of about 20 ° C. to about 50 ° C., to a high temperature of 110 ° C. or higher. To do.

  The storage unit 56 stores the hydrate antifreeze agent supplied from the compressor hydrate antifreeze supply unit 54 inside the compressor 50. The storage unit 56 of the present embodiment includes a first flow valve 561 provided on the inlet side of the compressor 50 and a second flow valve 562 provided on the outlet side of the compressor 50.

  The first flow valve 561 adjusts the supply of the natural gas G inside the gas flow part 51. Specifically, the first flow valve 561 of the present embodiment is provided on the upstream side of the inlet side characteristic value measurement unit 511 of the gas flow unit 51. The first flow valve 561 of this embodiment stops the supply of the natural gas G into the gas flow part 51 by being closed. The first flow valve 561 starts to supply the natural gas G into the gas flow part 51 by being opened. The first flow valve 561 is an electromagnetic valve whose opening and closing operations are controlled by the control unit 60.

  The second flow valve 562 adjusts the supply of the natural gas G and the hydrate antifreezing agent inside the compressed gas flow section 52. Specifically, the second flow valve 562 of the present embodiment is provided on the downstream side of the outlet side characteristic value measurement unit 521 of the compressed gas flow unit 52. The second flow valve 562 of the present embodiment stops the supply of the natural gas G and the hydrate antifreeze into the compressed gas flow section 52 by being closed. When the second flow valve 562 is opened, the supply of the natural gas G and the hydrate antifreeze into the compressed gas flow section 52 is started. The second flow valve 562 is an electromagnetic valve whose opening and closing operations are controlled by the control unit 60.

  The bypass supply unit 57 supplies the natural gas G flowing through the gas flow unit 51 without passing through the compressor 50 to the compressed gas flow unit 52. The bypass supply unit 57 of the present embodiment includes a bypass pipe 571 that branches from the gas flow part 51 and a bypass valve 572 that adjusts the flow of the natural gas G flowing through the bypass pipe 571.

  The bypass pipe 571 branches from the gas flow part 51 and is connected to the compressed gas flow part 52. Specifically, the bypass pipe 571 of this embodiment is connected to the gas flow part 51 at a position upstream of the inlet side characteristic value measurement part 511 and the first flow valve 561. The bypass pipe 571 is connected to the compressed gas circulation part 52 at a position downstream of the outlet side characteristic value measurement part 521 and the second circulation valve 562.

  The bypass valve 572 adjusts the supply of the natural gas G to the inside of the bypass pipe 571. Specifically, the bypass valve 572 of this embodiment stops the supply of the natural gas G into the bypass pipe 571 by being closed. By opening the bypass valve 572, the supply of the natural gas G into the bypass pipe 571 is started. The bypass valve 572 is an electromagnetic valve whose opening and closing operations are controlled by the control unit 60.

  The gas discharge unit 58 discharges the natural gas G and hydrate antifreeze agent inside the compressor 50 from the compressed gas circulation unit 52 to the outside. The gas discharge part 58 of this embodiment flows through the discharge pipe 581 branched from the compressed gas flow part 52, the fluid information measurement part 582 that measures information of the fluid flowing through the discharge pipe 581, and the discharge pipe 581. And a discharge valve 583 for adjusting the flow of the natural gas G and the hydrate antifreeze.

  The discharge pipe 581 branches from the compressed gas circulation part 52 and is connected to a discharge port (not shown). Specifically, the discharge pipe 581 of this embodiment is branched from the compressed gas circulation part 52 at a position downstream of the outlet side characteristic value measurement part 521 and upstream of the second circulation valve 562. Yes.

  The fluid information measuring unit 582 measures the type and temperature of the fluid flowing through the discharge pipe 581. The fluid information measurement unit 582 is provided on the upstream side of the discharge valve 583 of the discharge pipe 581. The fluid information measurement unit 582 of the present embodiment is a sensor that measures the type and temperature of the fluid flowing through the discharge pipe 581. The fluid information measurement unit 582 of the present embodiment detects whether the type of fluid flowing through the discharge pipe 581 has changed or whether the temperature of the fluid has changed, and sends information to the control unit 60. . Specifically, the fluid information measuring unit 582 of the present embodiment is information that the circulating fluid has been switched from the natural gas G to the hydrate antifreeze, and information that the temperature of the hydrate antifreeze has increased. , And information that the hydrate antifreeze has been switched to the natural gas G is sent to the control unit 60.

  The discharge valve 583 adjusts the supply of the natural gas G and the hydrate antifreeze to the inside of the discharge pipe 581. Specifically, the discharge valve 583 of this embodiment stops the supply of the natural gas G and the hydrate antifreeze agent into the discharge pipe 581 by being closed. When the discharge valve 583 is opened, the supply of the natural gas G and the hydrate antifreeze into the discharge pipe 581 is started. The discharge valve 583 is an electromagnetic valve whose opening and closing operations are controlled by the control unit 60.

  The pressure change unit 59 changes the pressure of the hydrate antifreeze flowing into the compressor 50 by changing the pressure of the hydrate antifreeze flowing through the compressor hydrate antifreeze supply unit 54. Specifically, the pressure changing unit 59 of the present embodiment is a boosting pump that increases or decreases the pressure of the hydrate antifreeze flowing in the supply pipe 541. The pressure change unit 59 is driven and controlled by the control unit 60. In the pressure changing unit 59 of the present embodiment, a monolith that has been in circulation as a hydrate antifreeze for a predetermined time in a range from about one atmospheric pressure to a maximum use protrusion pressure (for example, 200 bar) in the design of the compressor 50. Pressurize with ethylene glycol.

  The control unit 60 performs supply control for starting the cleaning of the compressor 50 when a predetermined condition is satisfied. The control unit 60 of this embodiment supplies the hydrate antifreeze to the compressor 50 and changes the pressure of the hydrate antifreeze in the compressor 50.

  Specifically, as shown in FIG. 3, the control unit 60 of the present embodiment includes a first input unit 61 to which the characteristic value measured by the inlet side characteristic value measuring unit 511 is input, and an outlet side characteristic value measuring unit. A second input unit 62 to which the characteristic value measured in 521 is input, and a difference calculation unit 63 that calculates a difference between the characteristic value input to the first input unit 61 and the characteristic value input to the second input unit 62. And have. Further, the control unit 60 of the present embodiment includes a first reference determination unit 64 that determines whether or not the difference calculated by the difference calculation unit 63 satisfies a predetermined first reference, and a first reference determination unit 64. On the basis of the determination result of the first reference determination unit 64 and the supply start instruction unit 65 for sending an instruction to start the supply of the hydrate antifreeze to the compressor 50 based on the determination result of And a storage / discharge instruction unit 71 that discharges the natural gas G and stores the hydrate antifreeze agent.

  Furthermore, the control unit 60 of the present embodiment includes a second reference determination unit 66 that determines whether or not the difference calculated by the difference calculation unit 63 satisfies a predetermined second reference, and a second reference determination unit 66. Based on the determination result of the second reference determination unit 66 and the heating supply instruction unit 67 that sends an instruction to supply the compressor 50 with the hydrate antifreeze agent heated by the heating unit 55 based on the determination result of And a cleaning end instruction unit 70 for sending an instruction to end the cleaning of the compressor 50. Furthermore, the control unit 60 of the present embodiment opens or closes the supply valve instruction unit 68 that opens or closes the supply valve 542 based on the input signal, and opens or closes the first flow valve 561 based on the input signal. It has a first flow valve instruction unit 72 and a second flow valve instruction unit 73 that opens or closes the second flow valve 562 based on the input signal.

  Furthermore, the control unit 60 of the present embodiment includes a bypass valve instruction unit 74 that opens or closes the bypass valve 572 based on the input signal, and a discharge valve that opens or closes the discharge valve 583 based on the input signal. And an instruction unit 75. Furthermore, the control unit 60 of this embodiment includes a fluid information input unit 76 to which information measured by the fluid information measurement unit 582 is input, a pressure change instruction unit 77 that sends an instruction to drive the pressure change unit 59, and a compression. And a compressor operation adjustment unit 78 that sends an instruction to adjust the operation state until the machine 50 starts operation and becomes steady operation.

The first input unit 61 receives the pressure value of the natural gas G measured by the inlet side characteristic value measuring unit 511. The first input unit 61 outputs information on the input pressure value to the difference calculation unit 63 and the compressor operation adjustment unit 78.
The pressure value of the natural gas G measured by the outlet side characteristic value measuring unit 521 is input to the second input unit 62. The second input unit 62 outputs the input pressure value information to the difference calculation unit 63 and the compressor operation adjustment unit 78.

  The difference calculation unit 63 calculates a difference obtained by subtracting the pressure value on the inlet side of the compressor input by the first input unit 61 from the pressure value on the outlet side of the compressor input by the second input unit 62. The difference calculation unit 63 outputs the calculated difference to the first reference determination unit 64. The difference calculation unit 63 outputs the calculated difference to the second reference determination unit 66 when information is input again from the first input unit 61 and the second input unit 62 after being output to the first reference determination unit 64. Output.

  The first reference determination unit 64 compares the difference information input from the difference calculation unit 63 with the first reference. Here, the first standard is a value indicating that the deposit is deposited and the flow path inside the compressor 50 is narrow, and the cleaning is necessary. The first reference of the present embodiment is set to a value smaller than the increase value of the pressure of the natural gas G compressed by the compressor 50 in the normal state when cleaning is not necessary. That is, the first reference of the present embodiment is a value of a difference in pressure between the inlet side and the outlet side of the compressor 50 in a state where the deposit is accumulated and the natural gas G is hardly compressed.

  The first reference determination unit 64 of this embodiment determines whether or not the input difference value is below the first reference. The first reference determination unit 64 sends a signal to the supply start instruction unit 65 and the storage / discharge instruction unit 71 when it is determined that the calculated difference is less than the first reference and satisfies the first reference. The first reference determination unit 64 sends a signal to the compressor operation adjustment unit 78 when it is determined that the calculated difference exceeds the first reference and does not satisfy the first reference.

  When the supply start instructing unit 65 determines that the first reference is satisfied by the first reference determining unit 64, the supply start instructing unit 65 prevents the compressor hydrate antifreeze supplying unit 54 from hydrate freezing to the compressor 50. Send instructions to start the agent supply. The supply start instruction unit 65 of the present embodiment sends a signal to the supply valve instruction unit 68 to open the supply valve 542 when a signal is input from the first reference determination unit 64.

  When the storage / discharge instruction unit 71 determines that the first standard is satisfied by the first standard determination unit 64, the storage / discharge instruction unit 71 discharges the natural gas G from the compressor 50, and the hydrate antifreeze agent is contained in the compressor 50. An instruction is sent to the storage unit 56, the bypass supply unit 57, and the gas discharge unit 58 so as to be accumulated. The storage / discharge instruction unit 71 of this embodiment sends a signal to the first flow valve instruction unit 72 so as to close the first flow valve 561. The storage / discharge instruction unit 71 sends a signal to the second flow valve instruction unit 73 so as to close the second flow valve 562. The storage / discharge instruction unit 71 sends a signal to the bypass valve instruction unit 74 to open the bypass valve 572. The storage / discharge instruction unit 71 sends a signal to the discharge valve instruction unit 75 to open the discharge valve 583.

  The second reference determination unit 66 compares the difference information input from the difference calculation unit 63 with the second reference. Here, the second standard is a value indicating that deposits in the flow path inside the compressor 50 are not sufficiently removed and a stronger cleaning is required. The second reference of the present embodiment is set to a value that is smaller than the increase value of the pressure of the natural gas G compressed by the compressor 50 in the normal state and larger than the first reference. That is, the second standard of the present embodiment is a state in which deposits remain in the compressor 50 and the natural gas G is not sufficiently compressed as a result of being washed once but not so much as to satisfy the first standard. This is the value of the difference in pressure between the inlet side and the outlet side of the compressor 50.

  The second reference determination unit 66 of this embodiment determines whether or not the input difference value is below the second reference. The second reference determination unit 66 sends a signal to the heating supply instruction unit 67 when it is determined that the calculated difference is less than the second reference and satisfies the second reference. The second reference determination unit 66 sends a signal to the cleaning end instruction unit 70 when it is determined that the calculated difference exceeds the second reference and does not satisfy the second reference.

  When the second reference determination unit 66 determines that the second reference is satisfied, the heating supply instruction unit 67 sends an instruction to supply the compressor 50 with the hydrate antifreeze heated by the heating unit 55. . The heating supply instructing unit 67 according to the present embodiment sends a signal to the heating unit 55 so as to start heating the hydrate antifreeze when the signal is input from the second reference determination unit 66.

  When the second reference determination unit 66 determines that the second standard is not satisfied, the cleaning end instruction unit 70 causes the compressor hydrate antifreeze supply unit 54 to end the cleaning of the compressor 50. Send instructions. The cleaning end instruction unit 70 according to the present embodiment receives a signal from the second reference determination unit 66, so that the supply valve instruction unit 68, the first flow valve instruction unit 72, the second flow valve instruction unit 73, and the discharge A signal is sent to the valve instruction unit 75.

  Specifically, the cleaning end instruction unit 70 of the present embodiment sends a signal to the supply valve instruction unit 68 so as to close the supply valve 542. The cleaning end instruction unit 70 sends a signal to the first circulation valve instruction unit 72 so as to open the first circulation valve 561. The cleaning end instruction unit 70 sends a signal to the second circulation valve instruction unit 73 so as to open the second circulation valve 562. The cleaning end instruction unit 70 sends a signal to the discharge valve instruction unit 75 to open the discharge valve 583.

  Supply valve instruction unit 68 sends an instruction to supply valve 542 to be opened when a signal is input from supply start instruction unit 65. The supply valve instruction unit 68 sends an instruction to close the supply valve 542 when a signal is input from the cleaning end instruction unit 70.

  The first flow valve instruction unit 72 sends an instruction to close the first flow valve 561 when a signal is input from the storage / discharge instruction unit 71. The first flow valve instruction unit 72 sends an instruction to the first flow valve 561 to be opened when a signal is input from the cleaning end instruction unit 70.

  The second flow valve instruction unit 73 sends an instruction to close the second flow valve 562 when a signal is input from the storage / discharge instruction unit 71. The second flow valve instructing unit 73 sends an instruction to the second flow valve 562 to open when a signal is input from the cleaning end instruction unit 70.

  By receiving a signal from the storage / discharge instruction unit 71, the bypass valve instruction unit 74 sends an instruction to open the bypass valve 572. By receiving a signal from the compressor operation adjusting unit 78, the bypass valve instruction unit 74 sends an instruction to close the bypass valve 572.

  The discharge valve instruction unit 75 sends an instruction to the discharge valve 583 to be opened when a signal is input from the storage / discharge instruction unit 71. The discharge valve instruction unit 75 sends an instruction to the discharge valve 583 to be opened when a signal is input from the cleaning end instruction unit 70. The discharge valve instruction unit 75 sends an instruction to close the discharge valve 583 when a signal is input from the fluid information input unit 76.

  The fluid information input unit 76 sends a signal to the discharge valve instruction unit 75, the pressure change instruction unit 77, and the compressor operation adjustment unit 78 based on the fluid type and temperature information measured by the fluid information measurement unit 582.

  Specifically, the fluid information input unit 76 of the present embodiment receives information from the fluid information measurement unit 582 that the fluid flowing through the discharge pipe 581 has been switched from natural gas G to hydrate antifreeze. Then, a signal is sent to the discharge valve instruction unit 75 to close the discharge valve 583, and a signal is sent to the pressure change instruction unit 77 to drive the pressure change unit 59.

  The fluid information input unit 76 receives the information from the fluid information measurement unit 582 that the temperature of the hydrate antifreeze agent flowing through the discharge pipe 581 has risen, so that the pressure change unit 59 is driven to drive the pressure change unit 59. A signal is sent to the unit 77.

  The fluid information input unit 76 sends a signal to the discharge valve instructing unit 75 to close the discharge valve 583 when information from the fluid information measurement unit 582 that the hydrate antifreeze agent is switched to the natural gas G is input. A signal is sent to the compressor operation adjustment unit 78 to start the operation of the compressor 50.

  The pressure change instruction unit 77 drives the pressure change unit 59 when a signal is input from the fluid information input unit 76.

  The compressor operation adjustment unit 78 starts the operation of the compressor 50 and sends an instruction to the compressor 50 while monitoring the operation state of the compressor 50 based on the pressure values on the inlet side and the outlet side of the compressor 50. Thereby, the operation state of the compressor 50 is adjusted until it becomes a steady operation.

  Specifically, the compressor operation adjustment unit 78 according to the present embodiment sends an instruction to start the operation to the compressor 50 when a signal is input from the first reference determination unit 64 or the fluid information input unit 76. The compressor operation adjustment unit 78 receives pressure value information from the first input unit 61 and the second input unit 62. The compressor operation adjustment unit 78 sends a signal to the bypass valve instruction unit 74 so as to gradually close the bypass valve 572 based on the input pressure value information. More specifically, the compressor operation adjusting unit 78 sends a signal for adjusting the opening degree of the bypass valve 572 while making it correspond to the input pressure value, so that steady operation is performed while monitoring the operation status of the compressor 50. The operating state of the compressor 50 is adjusted until

Next, the operation of the undersea production system 1 of the above embodiment will be described.
According to the undersea production system 1 of the present embodiment, the production fluid PF collected from the oil and gas field F through the production well W is collected in the manifold M, and the flow line is generated by pressure energy when mined from the oil and gas field F. It is transported in the FL and supplied to the subsea module SM.

  In the subsea module SM, power is supplied to each device by a umbilical line AL from a generator (not shown) on the ship S. The production fluid PF supplied to the subsea module SM is cooled by the main heat exchanger 2 and flows into the separator 3. The production fluid PF that has flowed into the separator 3 is separated into crude oil O that is liquid and natural gas G that is gas. The crude oil O separated by the separator 3 includes condensate and the like.

  Crude oil O separated by the separator 3 flows through the liquid circulation part 42 and is sent to the pump 41. In the pump 41, the crude oil O is compressed and sent to the oil pipeline OR through the compressed liquid circulation part 43, and supplied to a crude oil O storage tank (not shown) on the ship S.

  The natural gas G separated by the separator 3 circulates in the liquid circulation part 42 and is sent to the compressor 50. In the compressor 50, the natural gas G is compressed and sent to the compressed gas circulation part 52. A hydrate antifreeze is supplied from the hydrate antifreeze supply unit 53 to the compressed gas circulation unit 52, and the hydrate antifreeze is sent to the gas pipeline GR together with the compressed natural gas G. In the compressed gas circulation part 52, the natural gas G is supplied to a storage tank (not shown) for the natural gas G on the ship S while being prevented from freezing due to hydrate formation by the supplied hydrate antifreeze.

Next, a method for cleaning the compressor 50 according to the above embodiment will be described.
In the compressor 50 that compresses the natural gas G and supplies it to the ship S as described above, deposits are deposited in the compressor 50 by continuing to operate. In the cleaning method of the compressor 50, the compressor 50 in which the deposit is accumulated is cleaned by removing the deposit. A method for cleaning the compressor 50 according to the present embodiment will be described with reference to FIGS.

  In the cleaning method for the compressor 50 of the present embodiment, the compressor 50 is stopped as shown in FIG. 4 (compressor stop step S10). After the compressor stop step S10, the pressure value is measured and acquired as the characteristic value of the natural gas G that is the gas separated by the separator 3 on the inlet side and the outlet side of the compressor 50, and the state of the compressor 50 is measured. (Characteristic value acquisition step S100).

  Specifically, in the characteristic value acquisition step S100, the pressure value of the natural gas G flowing through the gas flow unit 51 is measured by the inlet-side characteristic value measurement unit 511, and the pressure value of the natural gas G on the inlet side of the compressor 50 is measured. To get. Further, the pressure value of the natural gas G flowing through the compressed gas flow unit 52 is measured by the outlet side characteristic value measuring unit 521, and the pressure value of the natural gas G on the outlet side of the compressor 50 is acquired.

  Next, in the cleaning method for the compressor 50 of the present embodiment, the difference between the acquired pressure value on the inlet side and the pressure value on the outlet side of the compressor 50 is calculated (difference calculating step S200). Specifically, in the difference calculation step S <b> 200, information on the pressure value measured by the inlet side characteristic value measuring unit 511 is input to the first input unit 61 of the control unit 60. Further, in the difference calculation step S <b> 200, information on the pressure value measured by the outlet side characteristic value measuring unit 521 is input to the second input unit 62 of the control unit 60. In the control unit 60, information input to the first input unit 61 and the second input unit 62 is input to the difference calculation unit 63. In the difference calculation unit 63, the difference between the pressure value on the outlet side and the pressure value on the inlet side of the compressor 50 is obtained by subtracting the information input from the first input unit 61 from the information input from the second input unit 62. Calculated.

  Subsequently, in the cleaning method for the compressor 50 of the present embodiment, it is determined whether or not the hydrate antifreeze is supplied to the compressor 50 (hydrate antifreeze supply determination step S300). Specifically, in the hydrate antifreeze supply determination step S300, the difference calculation unit 63 determines whether or not the hydrate antifreeze is already supplied to the compressor 50. When the difference calculation unit 63 determines that the information has been input once from the first input unit 61 and the second input unit 62, the difference calculation unit 63 determines that the hydrate antifreeze has already been supplied to the compressor 50. The difference information is output to the second reference determination unit 66. Conversely, if the difference calculation unit 63 determines that no information is input from the first input unit 61 and the second input unit 62, it is determined that no hydrate antifreeze is supplied to the compressor 50. Then, the difference information is output to the first reference determination unit 64.

  When it is determined that the hydrate antifreeze is not supplied to the compressor 50, it is determined whether or not the calculated difference satisfies a predetermined first reference (first reference determination step S400). Specifically, in the first reference determination step S <b> 400, the calculated difference is input from the difference calculation unit 63 to the first reference determination unit 64 in the control unit 60. The first reference determination unit 64 determines whether or not the input difference value is below the first reference. The first reference determination unit 64 sends a signal to the supply start instruction unit 65 when it is determined that the calculated difference is less than the first reference. Conversely, when the first reference determination unit 64 determines that the calculated difference exceeds the first reference, the first reference determination unit 64 sends a signal to the compressor operation adjustment unit 78 without performing cleaning of the compressor 50. Then, the operation of the compressor 50 is started.

  When the first reference determination unit 64 determines that the difference is less than the first reference and satisfies the first reference, the natural gas G inside the compressor 50 is discharged (gas discharge step S450), and the hydrate is discharged. The antifreezing agent is supplied into the compressor 50 (supply start step S500), and the hydrate antifreezing agent is stored inside the compressor 50 (storage step S430). In the cleaning method for the compressor 50 of the present embodiment, the storage step S430, the gas discharge step S450, and the supply start step are performed almost simultaneously. Specifically, in the cleaning method for the compressor 50 of the present embodiment, after the supply of the natural gas G to the compressor 50 is stopped and the hydrate antifreeze agent is stored in the compressor 50, The natural gas G in the compressor 50 is discharged, and a hydrate antifreeze is supplied into the compressor 50.

  More specifically, in the cleaning method for the compressor 50 of the present embodiment, the control unit 60 sends a signal from the first reference determination unit 64 to the storage / discharge instruction unit 71, and the storage / discharge instruction unit 71 performs the first circulation. Signals are sent to the valve instruction unit 72, the second flow valve instruction unit 73, the bypass valve instruction unit 74, and the discharge valve instruction unit 75.

  The first flow valve instruction unit 72 sends an instruction to close the first flow valve 561 when a signal is sent from the storage / discharge instruction unit 71. When the first flow valve 561 that has received the instruction is closed, the flow of the natural gas G flowing from the gas flow portion 51 to the compressor 50 is stopped. In the second flow valve instructing unit 73, a signal is sent from the storage / discharge instruction unit 71 to send an instruction to close the second flow valve 562. When the second flow valve 562 that has received the instruction is closed, the flow of the natural gas G flowing from the compressor 50 to the compressed gas flow section 52 stops (storage step S430).

  The bypass valve instructing unit 74 sends an instruction to the bypass valve 572 to open by receiving a signal from the storage / discharge instructing unit 71. When the bypass valve 572 that has received the instruction is opened, the natural gas G flows from the gas flow part 51 into the bypass pipe 571. The natural gas G that has flowed into the bypass pipe 571 flows into the compressed gas flow section 52 from the downstream side of the second flow valve 562 and is sent to the gas pipeline GR.

  The discharge valve instruction unit 75 sends an instruction to the discharge valve 583 to be opened by receiving a signal from the storage / discharge instruction unit 71. When the discharge valve 583 that has received the instruction is opened, the natural gas G remaining inside the compressor 50 flows into the discharge pipe 581 from the upstream side of the second flow valve 562 and is discharged to the outside (gas discharge). Step S450).

  In the control unit 60, a signal is sent from the first reference determination unit 64 to the storage / discharge instruction unit 71 and simultaneously, a signal is sent from the first reference determination unit 64 to the supply start instruction unit 65. The supply start instruction unit 65 sends a signal to the supply valve instruction unit 68 to start the supply of the hydrate antifreeze agent. The supply valve instruction unit 68 sends an instruction to the supply valve 542 to be opened by receiving a signal from the supply start instruction unit 65. Upon receipt of the instruction, the supply valve 542 is opened, so that a part of the hydrate antifreeze flowing through the hydrate antifreeze supply unit 53 flows into the supply pipe 541. The hydrate antifreeze that has flowed into the supply pipe 541 flows from the downstream side of the first flow valve 561 into the gas flow portion 51 and is sent to the compressor 50 (supply start step S500, compressor hydrate antifreeze agent). Supply step S530).

  The hydrate antifreeze flows into the discharge pipe 581 from the compressor 50 through the compressed gas circulation part 52 on the upstream side of the second circulation valve 562. The fluid information measuring unit 582 detects that the flowing fluid has been switched from the natural gas G to the hydrate antifreeze agent by flowing into the discharge pipe 581, and sends the information to the fluid information input unit 76. . The fluid information input unit 76 sends a signal to the discharge valve instruction unit 75 to close the discharge valve 583 based on the information that the fluid flowing through the discharge pipe 581 has been switched from the natural gas G to the hydrate antifreeze. When the discharge valve 583 that has received the instruction is closed, the flow of the hydrate antifreeze in the discharge pipe 581 is blocked. The hydrate antifreeze supplied from the supply pipe 541 is stored in the compressor 50 by blocking the flow in the discharge pipe 581 and the compressed gas circulation section 52.

  The fluid information input unit 76 sends a signal to the discharge valve instructing unit 75 and sends a signal to the pressure change instructing unit 77 to drive the pressure changing unit 59. The pressure change unit 59 changes the pressure of the hydrate antifreeze in the compressor 50 by receiving an instruction from the pressure change instruction unit 77 (pressure change step S550).

  Specifically, in the pressure changing step S550, the pressure changing unit 59 increases or decreases the pressure of the hydrate antifreeze flowing through the supply pipe 541 over a predetermined time. The pressure of the hydrate antifreeze in the compressor 50 is changed by sending the pressure from the supply pipe 541 to the compressor 50 while performing pressure swinging.

  After changing the pressure of the hydrate antifreeze, the pressure value of the natural gas G is again measured and acquired at the inlet side and the outlet side of the compressor 50, and the state of the compressor 50 is measured (characteristic value acquisition step) S100). Thereafter, the difference between the acquired pressure value on the inlet side and the pressure value on the outlet side of the compressor 50 is calculated (difference calculating step S200). Subsequently, it is determined whether or not a hydrate antifreeze is supplied to the compressor 50 (hydrate antifreeze supply determination step S300). At this time, since the information has already been input once from the first input unit 61 and the second input unit 62, the difference calculation unit 63 sends the hydrate antifreeze agent to the compressor 50 in the hydrate antifreeze supply determination step S300. Is output to the second reference determination unit 66.

  If it is determined that the hydrate antifreeze is supplied to the compressor 50, it is determined whether or not the calculated difference satisfies a predetermined second criterion (second criterion determination step S600). Specifically, in the second reference determination step S600, the control unit 60 inputs the calculated difference from the difference calculation unit 63 to the second reference determination unit 66. The second reference determination unit 66 determines whether or not the input difference value is below the second reference. The second reference determination unit 66 sends a signal to the heating supply instruction unit 67 when it is determined that the calculated difference is less than the second reference. Conversely, if the second reference determination unit 66 determines that the calculated difference exceeds the second reference, it sends a signal to the cleaning end instruction unit 70.

  When the second reference determination unit 66 determines that the difference is less than the second reference and satisfies the second reference, the heated hydrate antifreeze is supplied to the compressor 50 (heating supply step S700). . Specifically, in the heating supply step S700, in the control unit 60, a signal is sent from the second reference determination unit 66 to the heating supply instruction unit 67, and a signal is sent from the heating supply instruction unit 67 to the heating unit 55. When the heating unit 55 receives a signal from the heating supply instruction unit 67, the heating unit 55 starts heat exchange with the crude oil O flowing in the liquid circulation unit 42, and the hydrate antifreeze flowing through the supply pipe 541 is set to 110 ° C. Heat until high temperature. The hydrate antifreeze that has been heated to a high temperature flows into the gas flow part 51. The high-temperature hydrate antifreeze that has flowed into the gas flow part 51 is supplied to the compressor 50.

  By supplying the high-temperature hydrate antifreeze to the compressor 50, the compressed gas circulation part 52 is disposed upstream of the second flow valve 562 and upstream of the discharge valve 583 of the discharge pipe 581. High temperature hydrate antifreeze will also flow. The fluid information measuring unit 582 measures that the temperature of the circulating hydrate antifreeze has risen due to the flow of the high temperature hydrate antifreeze into the discharge valve 583, and sends the information to the fluid information input unit 76. The fluid information input unit 76 sends a signal to drive the pressure change unit 59 to the pressure change instruction unit 77 based on the information that the temperature of the hydrate antifreeze flowing through the discharge pipe 581 has increased. The pressure change unit 59 changes the pressure of the high-temperature hydrate antifreeze in the compressor 50 by receiving an instruction from the pressure change instruction unit 77 (pressure change step S550).

  After changing the pressure of the high-temperature hydrate antifreeze, the characteristic value acquisition step S100, the difference calculation step S200, and the hydrate antifreeze supply determination step S300 are performed in the same order as described above. In the hydrate antifreeze supply determination step S <b> 300, the difference calculation unit 63 determines again that the hydrate antifreeze is supplied to the compressor 50, and outputs difference information to the second reference determination unit 66. When the compressor 50 is sufficiently cleaned, the second reference determination unit 66 determines that the calculated difference exceeds the second reference, and sends a signal to the cleaning end instruction unit 70.

  The compressor operation adjustment unit 78 to which the signal is sent from the second reference determination unit 66 ends the cleaning of the compressor 50 and starts the operation of the compressor 50 (cleaning end step S800). Specifically, in the cleaning end step S800, the control unit 60 from the compressor operation adjustment unit 78 supplies the supply valve instruction unit 68, the discharge valve instruction unit 75, the first flow valve instruction unit 72, and the second flow valve instruction. A signal is sent to the unit 73.

  The supply valve instruction unit 68 sends an instruction to close the supply valve 542 by receiving a signal from the compressor operation adjusting unit 78. When the supply valve 542 that has received the instruction is closed, the supply of the hydrate antifreeze into the supply pipe 541 is stopped.

  The discharge valve instruction unit 75 sends an instruction to open the discharge valve 583 when a signal is sent from the compressor operation adjustment unit 78. Upon receiving the instruction, the discharge valve 583 is opened, so that the hydrate antifreeze remaining in the compressor 50 flows into the discharge pipe 581 from the upstream side of the second flow valve 562 and is discharged to the outside.

  The first flow valve instruction unit 72 sends an instruction to the first flow valve 561 to be opened by receiving a signal from the compressor operation adjustment unit 78. When the first flow valve 561 that has received the instruction is opened, the supply of the natural gas G from the gas flow unit 51 to the compressor 50 is started. The second flow valve instructing unit 73 sends an instruction to the second flow valve 562 to open by receiving a signal from the compressor operation adjusting unit 78. When the second flow valve 562 that has received the instruction is opened, the flow of the natural gas G that flows into the compressed gas flow section 52 from the compressor 50 starts, and the natural gas together with the hydrate antifreeze that has not flowed into the discharge pipe 581. G is sent to the gas pipeline GR.

  With the supply of natural gas G from the gas flow part 51 started and the supply of the hydrate antifreeze from the supply pipe 541 stopped, the hydrate antifreeze is discharged from the discharge pipe 581. Gradually, the natural gas G begins to be discharged from the discharge pipe 581. The fluid information measuring unit 582 detects that the fluid flowing through the discharge pipe 581 has been switched from the hydrate antifreeze agent to the natural gas G, and sends the information to the fluid information input unit 76. The fluid information input unit 76 sends a signal to the discharge valve instruction unit 75 to close the discharge valve 583 based on information that the fluid flowing through the discharge pipe 581 has been switched from the hydrate antifreeze agent to the natural gas G. When the discharge valve 583 that has received the instruction is closed, the discharge of the natural gas G from the discharge pipe 581 stops, and the natural gas G only flows through the compressed gas flow part 52 toward the gas pipeline GR.

  The fluid information input unit 76 sends a signal to the discharge valve instruction unit 75 and sends a signal to the compressor operation adjustment unit 78 to start the operation of the compressor 50. The compressor operation adjustment unit 78 that has received the signal from the fluid information input unit 76 activates the compressor 50. Thereafter, the compressor operation adjusting unit 78 monitors the operation status of the compressor 50 based on the pressure value information input from the first input unit 61 and the second input unit 62, and bypasses the bypass valve instruction unit 74. A signal for adjusting the opening of the valve 572 is sent. Then, the compressor operation adjustment unit 78 adjusts the operation state of the compressor 50 until the steady operation is performed while adjusting the opening degree of the bypass valve 572 via the bypass valve instruction unit 74.

  According to the compressor system 5 as described above, the hydrate antifreeze supplied from the hydrate antifreeze supply unit 53 to the compressed gas circulation unit 52 in order to suppress the hydration of the natural gas G compressed by the compressor 50. A part of the agent is supplied to the compressor 50 when the supply valve 542 is opened. The hydrate antifreeze agent not only prevents the hydration of the natural gas G and suppresses the hydrate formation, but also has lipophilicity and hydrophilicity, and therefore can remove oily dirt and aqueous dirt. it can. Therefore, the deposit deposited inside the compressor 50 can be effectively removed by the hydrate antifreeze supplied to the compressor 50. Further, by utilizing a part of the hydrate antifreeze supplied from the hydrate antifreeze supply unit 53 to the compressed gas circulation unit 52, a necessary amount of the hydrate antifreeze is stabilized in the compressor 50. Can be supplied. Further, the hydrate antifreezing agent in the compressor 50 is subjected to pressure swing by increasing or decreasing the pressure by the pressure changing unit 59 via the supply pipe 541, so that the hydride in the compressor 50 is hydrated. The rate antifreeze can be agitated. Therefore, the inside of the compressor 50 can be cleaned using the hydrate antifreeze agent effectively. Thus, the compressor 50 can be cleaned stably and effectively.

  Further, in the compressor system 5 of the present embodiment, the first flow valve 561 is closed, the supply of the natural gas G to the compressor 50 is stopped, and the discharge valve 583 is closed with the second flow valve 562 closed. Natural gas G is discharged from the discharge pipe 581 to the outside. Then, in a state where the natural gas G is discharged and hardly remains inside, the hydrate antifreeze is supplied to the compressor 50 and the pressure is changed by the pressure changing unit 59. Therefore, it is possible to prevent the hydrate antifreeze supplied to the compressor 50 from being diluted with the natural gas G. Therefore, the hydrate antifreeze supplied from the supply pipe 541 can be efficiently used for cleaning the compressor 50, and the supply amount of the hydrate antifreeze can be suppressed.

  Further, by supplying the hydrate antifreeze to the compressor 50 with the first flow valve 561 and the second flow valve 562 being closed and the discharge valve 583 also being closed, the hydrate freezing inside the compressor 50 is performed. The inhibitor can be stored without being discharged. The hydrate antifreeze can be efficiently stirred inside the compressor 50 by changing the pressure in the pressure changing unit 59 in a state where the hydrate antifreeze is stored inside the compressor 50. Therefore, the inside of the compressor 50 can be cleaned using the hydrate antifreeze more effectively. In addition, by washing without discharging the hydrate antifreeze from the compressor 50, the supply amount of the hydrate antifreeze to the compressor 50 can be reduced and the compressor 50 can be washed.

  Further, when the control unit 60 satisfies a predetermined condition as in the first reference determination unit 64, the hydrate antifreeze agent is caused to flow into the supply pipe 541 from the hydrate antifreeze supply unit 53, and the compressor 50. That is, by supplying the hydrate antifreeze to the compressor 50 by the first reference determination unit 64, the hydrate antifreeze is supplied to the compressor 50 in a state that requires cleaning. can do. Therefore, the hydrate antifreeze can be efficiently used for cleaning the compressor 50, and the supply amount of the hydrate antifreeze can be further suppressed.

  In the control unit 60, the pressure value of the natural gas G on the inlet side of the compressor 50 measured by the inlet side characteristic value measuring unit 511 of the gas circulation unit 51 is input to the first input unit 61, and the compressed gas circulation unit The pressure value of the natural gas G on the outlet side of the compressor 50 measured by the outlet side characteristic value measuring unit 521 of 52 is input to the second input unit 62, so that the inlet side and outlet side of the compressor 50 The pressure value of the natural gas G can be acquired. By calculating the difference with the difference calculation unit 63 from the pressure values of the natural gas G on the inlet side and the outlet side of the acquired compressor 50, and comparing with the first reference by the first reference determination unit 64, It can be easily estimated whether or not the compressor 50 is in a state that requires cleaning. Then, based on the determination result, a signal is sent from the first reference determination unit 64 to the supply start instruction unit 65, the supply valve 542 is opened via the supply valve instruction unit 68, and the hydrate antifreeze agent is supplied to the supply pipe 541. Supply can be started and the compressor 50 can be cleaned. Therefore, it can be determined with high accuracy whether or not the compressor 50 is in a state that requires cleaning, and the hydrate antifreeze can be supplied more limitedly. As a result, the hydrate antifreeze can be supplied from the supply pipe 541 more efficiently to the compressor 50 that requires cleaning, and the supply amount of the hydrate antifreeze can be further suppressed. it can.

  In addition, since the heating unit 55 for heating the hydrate antifreeze agent is provided in the supply pipe 541, the high temperature hydrate antifreeze agent can be supplied to the compressor 50. By being heated to a high temperature, the solubility of the hydrate antifreeze in the deposit can be improved. Therefore, the dissolution rate of the deposit accumulated in the compressor 50 can be improved, and the compressor 50 can be cleaned effectively.

  Further, the difference calculation unit 63 calculates a difference from the acquired pressure values of the natural gas G on the inlet side and the outlet side of the compressor 50, and the second reference determination unit 66 sets the difference to a value larger than the first reference. By making a determination in comparison with the second reference, it can be easily estimated whether or not the compressor 50 is in a state that requires cleaning again. Therefore, for example, it is easily estimated whether the state of the compressor 50 is different from that determined by using the first reference (for example, whether more powerful cleaning is required for the compressor 50). can do. Then, based on the determination result, a signal is sent from the second reference determination unit 66 to the heating supply instructing unit 67 to cause the heating unit 55 to start heating, thereby increasing the temperature of the hydrate antifreeze flowing through the supply pipe 541. be able to. As a result, the hydrate antifreeze that has been heated to a high temperature can be supplied to the compressor 50, and the compressor 50 can be more effectively cleaned. Therefore, it can be determined with high accuracy whether or not the compressor 50 is in a state different from the case where it is determined and cleaned using the first reference, and powerful cleaning is performed on the compressor 50 as necessary. Can be implemented. As a result, when the compressor 50 is in a state that requires strong cleaning, the heated hydrate antifreeze can be efficiently supplied to clean the compressor 50 more efficiently.

  In addition, by using monoethylene glycol having a hydrocarbon portion having lipophilicity and a hydroxyl group and ether group having hydrophilicity as a hydrate antifreeze agent, both oily soil and aquatic soil of the compressor 50 are effective. Can be cleaned.

  Moreover, according to the above-mentioned undersea production system 1, even if it is the compressor 50 installed in the position where maintenance is difficult, such as the seabed, it can wash | clean stably and efficiently. Therefore, clogging due to deposits can be suppressed, and the natural gas G can be stably sent onto the ship S by the compressor 50.

  In addition, according to the cleaning method for the compressor 50 as described above, the compressor hydrate antifreeze supply step S530 (supply start step S500) supplies the compressed gas circulation portion 52 from the hydrate antifreeze supply portion 53. A part of the hydrate antifreeze agent is supplied to the compressor 50. That is, instead of newly preparing and supplying a hydrate antifreeze, a part of the hydrate antifreeze supplied from the hydrate antifreeze supply unit 53 to the compressed gas circulation unit 52 is used. The necessary amount of hydrate antifreeze can be stably supplied to the compressor 50.

  In the gas discharge step S450, the supply of the natural gas G to the compressor 50 is stopped by closing the first flow valve 561, and the discharge valve 583 is opened with the second flow valve 562 closed to open the natural gas. G is discharged from the discharge pipe 581 to the outside. Therefore, in the pressure change process S550, the natural gas G is discharged and hardly remains in the interior, and the pressure change unit 59 applies pressure to the hydrate antifreeze in the compressor 50 via the supply pipe 541. The pressure swing can be performed by raising or lowering. Therefore, the hydrate antifreeze supplied to the inside of the compressor 50 can be suppressed from being diluted with the natural gas G, and the hydrate antifreeze inside the compressor 50 can be stirred. As a result, the inside of the compressor 50 can be cleaned using the hydrate antifreeze agent effectively and efficiently. Accordingly, the hydrate antifreeze supplied from the supply pipe 541 can be efficiently used for cleaning the compressor 50, and the compressor 50 can be stably stabilized while suppressing the supply amount of the hydrate antifreeze. It can be cleaned effectively.

  Further, in the storage step S430, the hydrate antifreeze is supplied to the compressor 50 in a state where the first flow valve 561 and the second flow valve 562 are closed and the discharge valve 583 is also closed. The internal hydrate antifreeze can be stored without being discharged. The hydrate antifreeze can be efficiently stirred inside the compressor 50 by changing the pressure in the pressure changing unit 59 in a state where the hydrate antifreeze is stored inside the compressor 50. Therefore, the inside of the compressor 50 can be cleaned using the hydrate antifreeze more effectively. In addition, by washing without discharging the hydrate antifreeze from the compressor 50, the supply amount of the hydrate antifreeze to the compressor 50 can be reduced and the compressor 50 can be washed.

  Further, the difference is calculated in the difference calculation step S200 from the pressure values of the natural gas G on the inlet side and the outlet side of the compressor 50 acquired in the characteristic value acquisition step S100, and compressed in the hydrate antifreeze supply determination step S300. It is determined whether the hydrate antifreeze is supplied to the machine 50, and then the compressor 50 needs to be cleaned by making a determination in comparison with the first reference in the first reference determination step S400. It is possible to easily estimate whether or not it is in a state to perform. Then, based on the determination result, the supply valve 542 can be opened in the supply start step S500 to start the supply of the hydrate antifreeze to the supply pipe 541. As a result, the supply of the hydrate antifreeze to the compressor 50 can be started, and the compressor 50 can be cleaned. Therefore, it can be determined with high accuracy whether or not the compressor 50 is in a state that requires cleaning, and the hydrate antifreeze can be supplied more limitedly. Thereby, it is possible to more efficiently supply the hydrate antifreeze supplied from the supply pipe 541 to the compressor 50 that requires cleaning, and further suppress the supply amount of the hydrate antifreeze. Can do.

  Further, after determining whether or not the hydrate antifreeze is supplied to the compressor 50 in the hydrate antifreeze supply determination step S300, the first reference determination step S400 or the second reference determination is performed based on the determination result. By performing step S600, the cleaning state of the compressor 50 can be estimated. Therefore, the compressor 50 can be more efficiently cleaned according to the cleaning state of the compressor 50.

  Further, the difference is calculated in the difference calculation step S200 from the pressure values of the natural gas G on the inlet side and the outlet side of the compressor 50 acquired in the characteristic value acquisition step S100, and the first reference is determined in the second reference determination step S600. It is possible to easily estimate whether or not the compressor 50 is in a state that requires cleaning again by making a determination in comparison with the second reference set to a larger value. Therefore, for example, it is easily estimated whether the state of the compressor 50 is different from that determined by using the first reference (for example, whether more powerful cleaning is required for the compressor 50). can do. And the temperature of the hydrate antifreeze which flows through the supply pipe | tube 541 can be raised by making the heating part 55 start heating by heating supply process S700 based on a determination result. As a result, the hydrate antifreeze that has been heated to a high temperature can be supplied to the compressor 50, and the compressor 50 can be cleaned more effectively. Therefore, it can be determined with high accuracy whether or not the compressor 50 is in a state different from the case where it is determined and cleaned using the first reference, and powerful cleaning is performed on the compressor 50 as necessary. Can be implemented. As a result, when the compressor 50 is in a state that requires strong cleaning, the heated hydrate antifreeze can be efficiently supplied to clean the compressor 50 more efficiently.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

  The characteristic value of the gas is not limited to the pressure value of the gas as in the present embodiment, and may be a value that causes a difference in state before and after being compressed by the compressor. For example, the characteristic value of the gas may be a value obtained by measuring the temperature of the gas, a value obtained by measuring the flow rate of the gas, or a value obtained by calculating the efficiency of the compressor 50.

  Further, when determining whether the first standard or the second standard is satisfied, as in the present embodiment, the supply of the hydrate antifreeze and the like is not performed based on a single determination result, but a plurality of times. It is good also as a structure which determines whether the 1st standard and the 2nd standard are satisfy | filled over. By setting it as such a structure, the dirt condition of the compressor 50 can be estimated with a high precision.

1 ... Underwater production system S ... Ship F ... Oil and gas field W ... Production well PF ... Production fluid M ... Manifold FL ... Flow line R ... Riser GR ... Gas pipeline OR ... Oil pipeline AR ... Pipeline for hydrate antifreeze AL ... umbilical line SM ... subsea module 2 ... main heat exchanger 3 ... separator 4 ... pump system 41 ... pump 42 ... liquid circulation part 43 ... compressed liquid circulation part 5 ... compressor system 50 ... compressor 51 ... gas circulation part 511: Inlet side characteristic value measuring unit 52 ... Compressed gas flow unit 521 ... Outlet side characteristic value measuring unit 53 ... Hydrate antifreeze supplying unit 54 ... Compressor hydrate antifreezing agent supplying unit 541 ... Supply pipe 542 ... Supply valve 55 ... Heating unit 56 ... Storage unit 561 ... First flow valve 562 ... Second flow valve DESCRIPTION OF SYMBOLS 7 ... Bypass supply valve 571 ... Bypass pipe 572 ... Bypass valve 58 ... Gas discharge part 581 ... Discharge pipe 582 ... Fluid information measurement part 583 ... Discharge valve 59 ... Pressure change part 60 ... Control part 61 ... First input part 62 ... First Two input units 63 ... difference calculation unit 64 ... first reference determination unit 65 ... supply start instruction unit 66 ... second reference determination unit 67 ... heating supply instruction unit 68 ... supply valve instruction unit 70 ... cleaning end instruction unit 71 ... storage discharge Instructing unit 72 ... first flow valve instructing unit 73 ... second flow valve instructing unit 74 ... bypass valve instructing unit 75 ... discharge valve instructing unit 76 ... fluid information input unit 77 ... pressure change instructing unit 78 ... compressor operation adjusting unit S10 ... Compressor stop step S100 ... Characteristic value acquisition step S200 ... Difference calculation step S300 ... Hydrate antifreeze supply determination step S400 ... First reference determination step S4 0 ... storing step S450 ... gas discharge step S550 ... pressure change steps S500 ... supply starting step S530 ... compressor hydrate antifreeze agent supply step S600 ... second reference determination step S700 ... heating supply step

Claims (12)

A compressor for compressing the gas;
A compressed gas flow section through which the gas compressed by the compressor flows,
A hydrate antifreeze supplying part for supplying a hydrate antifreeze to the compressed gas flow part for suppressing hydration of the gas;
A compressor hydrate antifreeze supply unit for supplying a part of the hydrate antifreeze supplied to the compressor by the hydrate antifreeze supply unit;
And a pressure change unit that changes the pressure of the hydrate antifreeze in the compressor. A gas discharge part for discharging the gas inside the compressor;
2. The compressor system according to claim 1, wherein the compressor hydrate antifreeze supplying unit supplies the hydrate antifreeze to the compressor to the compressor from which the gas has been discharged by the gas discharge unit. . A storage unit for storing the hydrate antifreeze in the compressor;
The compressor system according to claim 1, wherein the pressure change unit changes a pressure of the hydrate antifreeze stored by the storage unit.   The control part which performs supply control which starts supply of the hydrate antifreezing agent to the compressor with respect to the compressor hydrate antifreeze supply part when a predetermined condition is satisfied. The compressor system according to any one of claims 1 to 3. The controller is
A first reference determination unit that determines whether or not the difference between the characteristic values of the gas on the inlet side of the compressor and the outlet side of the compressor satisfies a predetermined first reference;
When the first standard determination unit determines that the first standard is satisfied, supply of the hydrate antifreeze to the compressor is started to the compressor hydrate antifreeze supply unit The compressor system according to claim 4, further comprising: a supply start instruction unit that sends an instruction to perform the operation. A heating unit for heating the hydrate antifreeze,
The compressor system according to any one of claims 1 to 5, wherein the compressor hydrate antifreeze supply unit supplies the compressor with the hydrate antifreeze heated by the heating unit. . A heating unit for heating the hydrate antifreeze,
The controller is
After the supply of the hydrate antifreeze agent to the compressor is started, the difference between the gas characteristic value between the inlet side of the compressor and the outlet side of the compressor is a predetermined second reference. A second reference determination unit that determines whether or not
When it is determined that the second reference is satisfied by the second reference determination unit, the hydrate antifreeze heated by the heating unit is supplied to the compressor hydrate antifreeze supply unit. The compressor system according to claim 5, further comprising: a heating supply instruction unit that sends an instruction to supply the compressor. The compressor system according to any one of claims 1 to 7,
A subsea production system comprising a separator that separates a production fluid pumped from a production well into the gas and liquid and supplies the separated fluid to the compressor. A compressor cleaning method for cleaning a compressor that compresses gas,
A gas discharge step for discharging the gas inside the compressor;
A part of the hydrate antifreeze agent that suppresses hydration of the gas supplied to the compressed gas circulation part through which the gas compressed by the compressor flows, and the compression of the gas discharged by the gas discharging step Compressor hydrate antifreeze supply process to be supplied to the machine,
And a pressure changing step of changing the pressure of the hydrate antifreeze in the compressor. Including a storing step of storing the hydrate antifreeze in the compressor;
The compressor cleaning method according to claim 9, wherein the pressure changing step changes a pressure of the hydrate antifreeze stored in the storing step. A first reference determination step for determining whether or not a difference between the characteristic values of the gas on the inlet side of the compressor and the outlet side of the compressor satisfies a predetermined first reference;
A supply start step of starting supply of the hydrate antifreeze to the compressor when it is determined that the first reference is satisfied in the first reference determination step. The method for cleaning a compressor according to claim 10. After starting the supply of the hydrate antifreeze to the compressor, the difference between the characteristic values of the gas between the inlet side of the compressor and the outlet side of the compressor is a predetermined second reference A second reference determination step for determining whether or not
The heating according to claim 11, further comprising: a heating and supplying step of supplying the heated hydrate antifreeze to the compressor when it is determined in the second criterion determining step that the second criterion is satisfied. How to wash the machine.

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