JP2016176219A - Extracted gas compression system and device and method for detecting abnormality thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extracted gas compression system and a device and a method for detecting abnormality thereof capable of detecting abnormality even when an operation range of a compressor is uncertain.SOLUTION: An abnormality detection device 20 for an extracted gas compression system comprises: a sensor 21 to detect a state quantity of extracted gas flowing into a compressor 4; a reference correlation acquisition section 23 to acquire a known reference correlation between supply power to a motor 5 and output of the compressor 4 with respect to sample gas having a known reference state quantity; an output correction section 24 to correct actual output of the compressor 4 on the basis of the state quantity of extracted gas detected by the sensor 21 and to calculate an output correction value for the compressor 4 corresponding to the supply power to the motor 5 when extracted gas has the reference state quantity; and an abnormality detection section 25 to detect abnormality of the extracted gas compression system on the basis of a comparison result between a relation of the supply power to the motor 5 with the output correction value and the reference correlation.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a mining gas compression system and an abnormality detection apparatus and method thereof.

In the mining of submarine resources such as oil and natural gas, a compressor is used to pressurize gas components contained in the mined resources and pump them to land facilities or floating facilities on the sea.
For example, Non-Patent Document 1 discloses that a natural gas mined in a gas-liquid mixed state from a gas well on the sea floor is separated into a gas component and a liquid component by gas-liquid separation on the sea floor, and then the gas component is pressurized by a compressor. It is described that it is sent to land equipment.

Turbomachinery International, September / October 2014, p. 18-24

  By the way, the specification of the compressor is determined in consideration of the operating range (use conditions) of the compressor. Specifically, the specifications of the compressor are determined according to the design life, assuming predetermined use conditions relating to the type of gas flowing into the compressor, the flow velocity, the rotational speed of the compressor, and the like.

  However, in the case of a mining gas compression system, the operating range of the compressor is uncertain because the characteristics of the mining gas can change. For this reason, in the case of a mining gas compression system, the life of the compressor may be shorter than the design life.

  Mining gas compression systems are often applied to marine plants. In a marine plant, if a compressor breaks down, it takes time to prepare an alternative machine, and during that time, the plant must be shut down. In particular, when the mining site is on the seabed, it takes a lot of time to remove and install the compressor, which further extends the plant shutdown period.

Therefore, in order to improve the profitability of the gas mining company by avoiding the sudden failure of the mining gas compression system, it is desired to develop a method for detecting an abnormality as a precursor of the failure of the mining gas compression system.
In this regard, Non-Patent Document 1 does not describe an abnormality detection method in the mining gas compression system.

  An object of at least some embodiments of the present invention is to provide a mining gas compression system capable of detecting an abnormality even if the operating range of the compressor is uncertain, and an abnormality detection apparatus and method thereof.

(1) An abnormality detection device for a mining gas compression system according to at least some embodiments of the present invention,
An abnormality detection device for a mining gas compression system having a compressor for boosting a mining gas and a motor for driving the compressor,
A sensor for detecting a state quantity of the mining gas flowing into the compressor;
A reference correlation acquisition unit for acquiring a known reference correlation between power supplied to the motor (motor input) and output of the compressor with respect to a sample gas having a known reference state quantity;
The compressor that corrects the actual output of the compressor based on the state quantity of the mining gas detected by the sensor, and that corresponds to the power supplied to the motor when the mining gas has the reference state quantity. An output correction unit for calculating the output correction value of
Based on the comparison result between the relationship between the power supplied to the motor and the output correction value and the reference correlation, an abnormality detection unit for detecting an abnormality of the mining gas compression system;
Is provided.

  In the configuration of (1) above, the motor when the mining gas has the reference state quantity (known state quantity of the sample gas) by correcting the actual output of the compressor based on the detection result of the mining gas state quantity. The compressor output correction value corresponding to the supplied power is calculated. The output correction value of the compressor obtained in this way is based on the same state quantity (reference state quantity) as the sample gas, so the motor supply power and output correction are not affected by fluctuations in the state quantity of the mining gas. The relationship between values can be compared appropriately with the reference correlation. Therefore, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to detect an abnormality as a sign of a failure of the mining gas compression system.

(2) In some embodiments, in the configuration of (1) above,
The abnormality detection device of the mining gas compression system is:
When an abnormality of the mining gas compression system is detected by the abnormality detection unit, based on the comparison result of the actual output and the design output value of the motor corresponding to the power supplied to the motor (motor input), the abnormality The apparatus further includes an abnormal point specifying unit configured to specify whether the generation point is the compressor or the motor.

In the configuration of (1) above, when an abnormality of the mining gas compression system is detected by the abnormality detection unit, it is either a motor or a compressor that can be considered as an abnormality occurrence location.
Therefore, in the configuration of (2) above, it is specified whether the location where the abnormality has occurred is the compressor or the motor based on the comparison result of the actual motor output and the design output value corresponding to the motor supply power. ing.
For example, when the difference between the actual motor output corresponding to the motor supply power and the design output value is within an allowable range, it is considered that the abnormality occurrence location is not the motor but the compressor. On the other hand, when the difference between the motor actual output corresponding to the motor supply power and the design output value exceeds the allowable range, it is considered that the abnormality occurrence place is not the compressor but the motor. In this way, an abnormality occurrence location can be specified based on the comparison result between the motor actual output and the design output value corresponding to the motor supply power.

(3) In some embodiments, in the above configuration (1) or (2),
The abnormality detection unit has a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit exceeds a first threshold. Is configured to determine that an abnormality has occurred in the mining gas compression system.

  According to the configuration of (3) above, the difference between the reference output of the compressor corresponding to the motor supply power determined based on the reference correlation and the output correction value calculated by the output correction unit is compared with the first threshold value. Thus, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to determine whether there is an abnormality in the mining gas compression system with high accuracy.

(4) In some embodiments, in the above configuration (1) or (2),
The abnormality detection unit has a deviation rate of the output correction value calculated by the output correction unit with respect to a reference output of the compressor corresponding to power supplied to the motor in the reference correlation exceeds a second threshold value. Is configured to determine that an abnormality has occurred in the mining gas compression system.

  According to the configuration of (4) above, the deviation rate of the output correction value calculated by the output correction unit with respect to the reference output of the compressor corresponding to the motor supply power determined based on the reference correlation is compared with the second threshold value. Thus, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to determine whether there is an abnormality in the mining gas compression system with high accuracy.

(5) In some embodiments, in the above configuration (1) or (2),
The abnormality detection unit is a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit, or for the reference output It is configured to determine that an abnormality has occurred in the mining gas compression system when a period in which the deviation rate of the output correction value exceeds a third threshold continues for a specified time or longer.

  According to the configuration of (5) above, whether or not the difference between the reference output of the compressor and the output correction value, or the period during which the deviation rate of the output correction value with respect to the reference output exceeds the third threshold is equal to or longer than the specified time. Therefore, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to determine whether there is an abnormality in the mining gas compression system with high accuracy.

(6) In some embodiments, in the above configuration (1) or (2),
The abnormality detection unit is a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit, or for the reference output When the increase rate of the deviation rate of the output correction value exceeds a fourth threshold, it is configured to determine that an abnormality has occurred in the mining gas compression system.

  According to the configuration of (6) above, the difference between the reference output of the compressor and the output correction value, or the rate of increase in the deviation rate of the output correction value with respect to the reference output is compared with the fourth threshold value. Even if the operating range of the compressor is uncertain due to fluctuations in the state quantity, it is possible to determine whether there is an abnormality in the mining gas compression system with high accuracy.

(7) A mining gas compression system according to at least some embodiments of the present invention includes:
A compressor for boosting the mining gas;
A motor for driving the compressor; and
An abnormality detection device having any one of the configurations (1) to (6).

  According to the structure of said (7), even if the operating range of a compressor is indefinite by the fluctuation | variation of the state quantity of mining gas by providing the abnormality detection apparatus of said (1)-(6), it is mining gas. An abnormality as a precursor of a failure of the compression system can be detected. Therefore, it is possible to avoid a long-term shutdown due to a sudden failure of the mining gas compression system and improve the profitability of the gas mining company.

(8) An abnormality detection method for a mining gas compression system according to at least some embodiments of the present invention includes:
A method for detecting an abnormality in a mining gas compression system having a compressor for boosting a mining gas and a motor for driving the compressor,
A state quantity detection step of detecting a state quantity of the mining gas flowing into the compressor;
A reference correlation obtaining step for obtaining a known reference correlation between power supplied to the motor and output of the compressor with respect to a sample gas having a known reference state quantity;
The compressor that corrects the actual output of the compressor based on the state quantity of the mining gas detected by the sensor, and that corresponds to the power supplied to the motor when the mining gas has the reference state quantity. An output correction step for calculating an output correction value of
An abnormality detection step for detecting an abnormality of the mining gas compression system based on a comparison result between the relationship between the power supplied to the motor and the output correction value and the reference correlation;
Is provided.

  In the above method (8), the motor in the case where the mining gas has the reference state quantity (known state quantity of the sample gas) by correcting the actual output of the compressor based on the detection result of the mining gas state quantity. The compressor output correction value corresponding to the supplied power is calculated. The output correction value of the compressor obtained in this way is based on the same state quantity (reference state quantity) as the sample gas, so the motor supply power and output correction are not affected by fluctuations in the state quantity of the mining gas. The relationship between values can be compared appropriately with the reference correlation. Therefore, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to detect an abnormality as a sign of a failure of the mining gas compression system.

(9) In some embodiments,
The abnormality detection method of the mining gas compression system is:
When an abnormality of the mining gas compression system is detected in the abnormality detection step, the occurrence location of the abnormality is determined based on the comparison result of the actual output and the design output value of the motor corresponding to the power supplied to the motor. The method further includes an abnormal point specifying step of specifying whether the compressor or the motor.

In the method of (9) above, based on the comparison result of the motor actual output and the design output value corresponding to the motor supply power, it is specified whether the abnormality occurrence location is the compressor or the motor. .
For example, when the difference between the actual motor output corresponding to the motor supply power and the design output value is within an allowable range, it is considered that the abnormality occurrence location is not the motor but the compressor. On the other hand, when the difference between the motor actual output corresponding to the motor supply power and the design output value exceeds the allowable range, it is considered that the abnormality occurrence place is not the compressor but the motor. In this way, an abnormality occurrence location can be specified based on the comparison result between the motor actual output and the design output value corresponding to the motor supply power.

  According to at least one embodiment of the present invention, even if the operating range of the compressor is uncertain due to fluctuations in the state quantity of the mining gas, it is possible to detect an abnormality as a precursor of a failure of the mining gas compression system.

It is a figure showing a schematic structure of a mining gas compression system concerning one embodiment. It is a figure for demonstrating the input-output of the motor and compressor which concern on one Embodiment. It is a graph which shows an example of the actual measurement value and correction value with respect to reference | standard correlation. It is a graph which shows an example of the time-sequential change of the difference of a reference output and an output correction value. It is a graph which shows an example of the time-sequential change of the deviation rate of the output correction value with respect to a reference | standard output. It is a figure for demonstrating the input / output of the motor and compressor which concern on other embodiment. It is a graph which shows the relationship between a motor input and a motor output. It is a flowchart which shows the abnormality detection method of the mining gas compression system which concerns on one Embodiment.

  Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.

Initially, with reference to FIG. 1, schematic structure of the mining gas compression system 1 which concerns on one Embodiment is demonstrated.
As shown in FIG. 1, the mining gas compression system 1 mainly compresses (pressurizes) the mining gas 54 contained in resources mined in a gas field or oil field existing underground or on the seabed, for example, an external processing facility. It is a system for pumping to a storage facility. In the configuration example shown in FIG. 1, the mining gas compression system 1 is applied to a marine plant, the mining gas 54 mined from the gas field 52 on the seabed 51 is a target for compression, and the compressor 5 is installed on the seabed 51. The structure is illustrated.
Although not shown in the drawings, in another configuration example, the mining gas compression system 1 may compress gas mined from other water bottoms such as a lake bottom and a river bottom. Or it is good also as a structure installed on land. Or the mining gas compression system 1 is good also considering the gas mined from the underground as a compression object.

  In one embodiment, the mining gas compression system 1 includes a gas-liquid separator 8, a compressor 5 connected to the gas-liquid separator 8, and a motor 4 for driving the compressor 5.

  The gas-liquid separator 8 is configured to separate a liquid component from a liquid-containing gas (mining gas) 53 mined from a gas field 52 existing on the seabed 51. In general, the gas buried in the seabed 51 is often mined in a state containing a liquid component. In that case, the gas-liquid separator 8 separates the liquid component from the liquid-containing gas 53 and removes only the gas component. The liquid separation gas (mining gas) 54 that is contained is sent to the compressor 5. Depending on the properties of the liquid-containing gas 53, the gas-liquid separator 8 may not be installed.

  The compressor 5 is connected to the output shaft 6 of the motor 4 and is configured to be driven by the motor 4 to boost the fluid. The compressor 5 and the motor 4 may constitute the motor-integrated compressor 2 in which the compressor 5 and the motor 4 are accommodated in the single casing 3. As shown in the figure, when the compressor 5 is installed on the seabed 51, if the motor-integrated compressor 2 is adopted, the compressor 5 and the motor 4 can be easily corroded by seawater by forming the casing 3 in an airtight structure. Can protect. Alternatively, although not shown, when the compressor 5 is installed on the offshore platform 11, if the motor-integrated compressor 2 is employed, the compressor 5 and the motor 4 can be reduced in size, so that the space is limited. Space saving in the platform 11 can be achieved.

In the mining gas compression system 1 described above, the liquid-containing gas (mining gas) 53 mined from the gas field 52 on the seabed 51 is introduced into the gas-liquid separator 8, where the gas component and the liquid component are separated. Separated.
A liquid separation gas (mining gas) 54 from which the liquid component has been separated by the gas-liquid separator 8 is introduced into the compressor 5 connected to the gas-liquid separator 8 and is pressurized by the compressor 5. In addition, since the liquid component of the mining gas 53 separated by the gas-liquid separator 8 is sent to another processing line, the illustration is omitted.
The compressed gas 55 discharged from the compressor 5 is sent to the outside of the mining gas compression system 1. For example, as illustrated, the compressed gas 55 is temporarily stored in a tank placed on the platform 11 floating on the sea surface 50 and then transported by the tanker 12.

By the way, normally, the specification of the compressor 5 is determined in consideration of the operating range (use conditions) of the compressor 5. Specifically, the specifications of the compressor 5 are determined according to the design life, assuming predetermined use conditions regarding the type of gas flowing into the compressor 5, the flow velocity, the compressor rotation speed, and the like.
However, in the case of the mining gas compression system 1 having the above configuration, since the characteristics of the mining gas 54 can change, the operating range (use conditions) of the compressor 5 is uncertain, and the life of the compressor 5 is longer than the design life. May be shortened. In particular, when applied to a marine plant as shown in FIG. 1, even if the compressor 5 breaks down, it takes time to prepare an alternative machine, during which the plant operation is forced to stop.

  Therefore, in the present embodiment, the abnormality detection device 20 capable of detecting an abnormality of the mining gas compression system 1 with high accuracy even when the operation range of the compressor 5 is uncertain is provided.

  The abnormality detection device 20 according to some embodiments performs a calculation for detecting an abnormality of the compressor 5 using the sensor 21 for detecting the state quantity of the mining gas 54 and the detection value of the sensor 21. And an arithmetic processing unit 22 configured as described above.

Hereinafter, a specific configuration example of each part of the abnormality detection device 20 will be described.
The sensor 21 is configured to detect a state quantity of the mined gas 54 flowing into the compressor 5. Specifically, the sensor 21 is provided in a gas line connecting the gas-liquid separator 8 and the compressor 5 and detects the state quantity of the mined gas 54 after the liquid component separation.
Here, the state quantity of the mining gas 54 may include at least one of the density, temperature, and pressure of the mining gas 54.

The arithmetic processing device 22 includes a reference correlation acquisition unit 23, an output correction unit 24, an abnormality detection unit 25, and a storage unit 27.
The arithmetic processing unit 22 includes, for example, a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processing steps for realizing various functions to be described later are recorded in a recording medium or the like in the form of a program, and the CPU reads the program into a RAM or the like to execute information processing / arithmetic processing. Thus, various functions described later are realized. The arithmetic processing unit 22 may be disposed in a remote place away from the mining gas compression system 1.

  The reference correlation acquisition unit 23 is configured to acquire a known reference correlation between the power supplied to the motor 4 and the output of the compressor 5 regarding the sample gas. As described above, the sample gas has a known reference state quantity. In the reference correlation acquisition unit 23, the known reference correlation may be acquired from the storage unit 27 or may be input from an input unit (not shown).

  The output correction unit 24 corrects the actual output of the compressor 5 based on the state quantity of the mining gas 54 detected by the sensor 21, and corresponds to the power supplied to the motor 4 when the mining gas 54 has the reference state quantity. It is comprised so that the output correction value of the compressor 5 to calculate may be calculated.

  The abnormality detection unit 25 detects an abnormality in the mining gas compression system 1 based on the comparison result between the relationship between the power supplied to the motor 4 and the output correction value and the reference correlation.

  The storage unit 27 stores, for example, a known reference correlation between the power supplied to the motor 4 and the output of the compressor 5 regarding the sample gas. The storage unit 27 stores a known reference correlation acquired in advance. This known reference correlation may be acquired, for example, by an experiment using a sample gas, may be acquired by simulation, or may be acquired from empirical past data. The known reference correlation acquired in this way may be stored in the storage unit 27 via a communication line or a storage medium, or may be stored in the storage unit 27 by an input from the input unit of the arithmetic processing device 22. .

The storage unit 27 stores one reference correlation for one type of state quantity. As will be described later, when an abnormality is detected, the output of the compressor 5 is corrected based on the state quantity corresponding to the reference correlation, and then the reference correlation and the output correction value of the compressor 5 are compared. In principle, the storage unit 27 only needs to store one reference correlation.
However, the storage unit 27 may store a plurality of reference correlations for one type of state quantity. For example, when the state quantity is density, the storage unit 27 stores a plurality of reference correlations having different densities. The storage unit 27 may store reference correlations regarding a plurality of types of state quantities. For example, the storage unit 27 stores a reference correlation in which the state quantity is density and a reference correlation in which the state quantity is pressure.

Here, the known reference correlation will be specifically described.
FIG. 2 is a diagram for explaining input / output of the motor 4 and the compressor 5 according to the embodiment. FIG. 3 is a graph showing an example of actual measurement values and correction values for the reference correlation 100.
As shown in FIG. 2, the motor 4 drives the compressor 5 with the output Y when electric power (motor input X) is supplied.
As shown in FIG. 3, as an example, the known reference correlation between the power supplied to the motor 4 (motor input X) and the output Y of the compressor 5 with respect to the sample gas having a known reference state quantity is a straight line 100. expressed.

ここで、Ｙは圧縮機５の出力(kW）、Ｑは圧縮前の気体体積(m^３/s）、Ｐ_１は圧縮前の圧力(N/m^２)、Ｐ_２は圧縮後の圧力(N/m^２)、Ｋ，ｍは定数である。
圧縮機５の実際の出力Ｙ_１を取得する場合には、各種センサ等によって、圧縮前の気体体積、圧縮前の圧力、圧縮後の圧力を検出する。 In FIG. 3, in addition to the known reference correlation 100, the actual measurement value and the correction value of the compressor 5 are also plotted.
Measured value of the compressor 5 is an actual output Y ₁ of the compressor 5 to the actual power supplied to the motor 4 (motor input X). The output Y of the compressor 5 can be obtained by the following equation (1).

Here, Y is the output of the compressor 5 (kW), Q is the gas volume before compression (m ³ / s), P ₁ is the pressure before compression (N / m ² ), and P ₂ is the pressure after compression (N N / m ² ), K and m are constants.
When acquiring the actual output Y ₁ of the compressor 5, various sensors, and the like, the gas volume before compression, the pressure before compression, to detect the pressure after compression.

Thus obtained measured value of the compressor 5 (the relationship between the actual output Y ₁ of the motor input X and the compressor) are often separated from the known reference correlation 100 as shown. As one of the factors, it can be considered that the state quantity of the mined gas 54 passing through the compressor 5 changes. Therefore, detecting an abnormality simply by comparing the known reference correlation 100 with the actual measurement value of the compressor 5 leads to a decrease in the accuracy of abnormality detection.
Therefore, in some embodiments, the output correction unit 24, and calculates the actual output Y ₁ output correction value Y obtained by correcting the 'compressor 5 based on the state quantity of mining gas 54.

ここで、Ｙ’は圧縮機５の出力補正値(kW)、Ｙ_１は圧縮機５の実際の出力(kW）、ρ_０はサンプルガスの密度、ρはセンサ２１によって検出された採掘ガス５４の密度である。 The output correction value Y ′ of the compressor 5 is obtained by the following equation (2) when the state quantity is density, for example.

Here, Y ′ is the output correction value (kW) of the compressor 5, Y ₁ is the actual output (kW) of the compressor 5, ρ ₀ is the density of the sample gas, and ρ is the mining gas 54 detected by the sensor 21. Density.

The correction value plotted in the figure based on the output correction value Y ′ of the compressor 5 and the input X of the motor 4 obtained in this way is the mining gas if there is no abnormality in the motor 4 or the compressor 5. Regardless of the change in the state quantity of 54, the form generally follows the known reference correlation 100.
On the other hand, the output correction value Y ′ of the compressor 5 that is greatly deviated from the known reference correlation 100 can be determined to be abnormal.
Therefore, in some embodiments, the abnormality detection unit 25 uses a comparison result between the relationship between the power supplied to the motor 4 (motor input X) and the output correction value Y ′ of the compressor 5 and the reference correlation 100. Based on this, the abnormality of the mining gas compression system 1 is detected.

According to the abnormality detection apparatus 20 having the above structure, mining based on the detection result of the state of the gas 54 by correcting the actual output Y ₁ of the compressor 5, a known mining gas 54 is the reference state amount (the sample gas The output correction value Y ′ of the compressor 5 corresponding to the motor supply power (motor input X) is calculated. Since the output correction value Y ′ of the compressor 5 obtained in this way is based on the same state quantity (reference state quantity) as the sample gas, the motor supply is not affected by the fluctuation of the state quantity of the mining gas 54. The relationship between the power and the output correction value Y ′ can be appropriately compared with the reference correlation 100. Therefore, even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54, it is possible to detect an abnormality as a precursor to the failure of the mining gas compression system 1.

Hereinafter, the abnormality detection in the abnormality detection unit 25 will be specifically described.
Figure 4 is a graph showing an example of a time series change of the difference D between the reference output Y ₀ and the output correction value Y '. Figure 5 is a graph showing an example of a time-series change in the rate of deviation output correction value Y 'with respect to the reference output Y _0. In the following description, the reference numerals shown in FIGS. 1 and 2 are used as appropriate. Further, in the graph shown in FIGS. 4 and 5, the reference output Y ₀ output correction value Y 'time series change of the difference between, or the output correction value Y with respect to the reference output Y _0' time series change in the rate of deviation is Each of the values calculated intermittently is schematically shown by a curve.

As shown in FIG. 4, in one embodiment, the abnormality detection unit 25 includes the reference output Y ₀ of the compressor 5 corresponding to the power (motor input X) supplied to the motor 4 in the reference correlation 100 (see FIG. 3). Then, it is configured to determine that an abnormality has occurred in the mining gas compression system 1 at time t ₁ when the difference D from the output correction value Y ′ calculated by the output correction unit 24 exceeds the first threshold value. For example, when the absolute value of the difference D between the reference output Y ₀ of the compressor 5 and the output correction value Y 'exceeds the first threshold value, it may be determined that an abnormality has occurred in the mining gas compression system 1. Alternatively, the absolute amount may be provided a positive first threshold value and a negative first threshold value is the same, the difference D of the reference output Y ₀ of the compressor 5 and the output correction value Y 'is a positive first threshold value when exceeded, or when the difference D between the reference output Y ₀ and the output correction value Y 'of the compressor 5 is below a negative first threshold value, be judged that an abnormality has occurred in the mining gas compression system 1 Good.

Thus, the reference correlation relationship 100 reference output Y ₀ of the compressor 5 that corresponds to the motor supply power (motor input X) determined based on (see FIG. 3), the output correction value Y calculated by the output correction unit 24 By comparing the difference D with the first threshold value, even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54, it is possible to determine whether there is an abnormality in the mining gas compression system 1 with high accuracy. Can be determined.

As shown in FIG. 5, in another embodiment, the abnormality detection unit 25 uses the reference output Y ₀ of the compressor 5 corresponding to the power supplied to the motor 4 (motor input X) in the reference correlation 100 (see FIG. 3). On the other hand, at time t ₂ when the deviation rate of the output correction value Y ′ calculated by the output correction unit 24 exceeds the second threshold, it is determined that an abnormality has occurred in the mining gas compression system 1. The deviation rate of the output correction value Y ′ may be a value obtained by dividing the difference D between the reference output Y ₀ and the output correction value Y ′ by the reference output Y ₀ . For example, when the absolute value of the deviation rate from the output correction value Y ′ with respect to the reference output Y ₀ of the compressor 5 exceeds the second threshold value, it may be determined that an abnormality has occurred in the mining gas compression system 1. Alternatively, a positive second threshold value and a negative second threshold value having the same absolute amount are provided, and a second threshold value having a positive deviation rate from the output correction value Y ′ with respect to the reference output Y ₀ of the compressor 5 is set. when exceeded, or when the output correction value Y 'with the deviation rate with respect to a reference output Y ₀ of the compressor 5 is below a negative second threshold value, be determined that abnormality has occurred in the mining gas compression system 1 Good.

Thus, the reference output Y ₀ of the compressor 5 that corresponds to the power supply (motor input X) to the motor 4 determined based on the reference correlation 100 (see FIG. 3), which is calculated by the output correction unit 24 outputs By comparing the deviation rate of the correction value Y ′ with the second threshold value, it is possible to determine whether or not the mining gas compression system 1 is abnormal even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54. It can be determined with high accuracy.

In still another embodiment, as shown in FIGS. 4 and 5, the abnormality detection unit 25 includes the compressor 5 corresponding to the power supplied to the motor 4 (motor input X) in the reference correlation 100 (see FIG. 3). a reference output Y _0, the output correction unit output correction value calculated by the 24 Y 'difference between or reference output Y ₀ output correction value Y for,' the deviation rate period that exceeds a third threshold value specified time t of _It is configured to determine that an abnormality has occurred in the mining gas compression system 1 when continuing for more than _reg . That is, the abnormality detecting unit 25, a reference output Y ₀ of the compressor 5 and the output correction value Y 'difference between or a reference output Y output correction value for ₀ Y' of deviation rate is, the time exceeds the third threshold value counting the elapsed time from t _3, it determines that an abnormality has occurred at time t ₄ when the elapsed time reaches the specified time t _reg.
In addition, you may provide two threshold values like the 1st threshold value and 3rd threshold value which are shown in FIG. 4, or the 2nd threshold value and 3rd threshold value which are shown in FIG. In this case, the third threshold value is smaller than the first threshold value or the second threshold value.

Thus, the reference output Y ₀ of the compressor 5 and the output correction value Y 'the difference between, or the reference output Y ₀ to the output correction value Y' period deviation rate exceeds a third threshold value of the specified time t _reg Based on whether or not the above is true, whether or not the mining gas compression system 1 is abnormal can be determined with high accuracy even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54. it can.

Further, the abnormality detecting unit 25, the electric power supplied to the motor 4 at the reference correlation 100 with the reference output Y ₀ of the compressor 5 that corresponds to the (motor input X), it is calculated by the output correction unit 24 output correction value Y ' Or the increase rate of the deviation rate of the output correction value Y ′ with respect to the reference output Y ₀ exceeds a fourth threshold (not shown), it is determined that an abnormality has occurred in the mining gas compression system 1. It may be configured. That is, the abnormality detecting unit 25, a reference output Y ₀ of the compressor 5 and the output correction value Y 'time series change in the differential value of the difference between (see FIG. 4), or, the output correction value for the reference output Y ₀ Y' When the time-series change of the differential value of the deviation rate (see FIG. 5) exceeds the fourth threshold, it is determined that an abnormality has occurred in the mining gas compression system 1.
According to this, the reference output Y ₀ of the compressor 5 and the output correction value Y 'the difference between, or the output correction value Y with respect to the reference output Y _0' the rate of increase in the rate of deviation is compared with a fourth threshold value Even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54, the presence or absence of an abnormality in the mining gas compression system 1 can be determined with high accuracy.

Moreover, the abnormality detection device 20 described above may further include the following configuration.
In another embodiment, the arithmetic processing device 22 of the abnormality detection device 20 further includes an abnormality location specifying unit 26 (see FIG. 1).
When the abnormality detection unit 25 detects an abnormality in the mining gas compression system 1, the abnormal part specifying unit 26 detects the actual output Z ₁ and the design output value of the motor 4 corresponding to the power supplied to the motor 4 (motor input X). Based on the comparison result of Z ₀ , it is configured to specify whether the abnormality occurrence location is the compressor 5 or the motor 4.

ここで、Ｚはモータ出力（ｋＷ）、Ｔはトルク［ｋｇ・ｍ（Ｎ／ｍ／９．８）］、Ｎは回転速度(ｍｉｎ^−１)である。この場合、モータ４の実際出力Ｚ_１を取得する場合、センサ等によって、モータ４のトルク及び回転速度を検出する。 FIG. 6 is a diagram for explaining input / output of the motor 4 and the compressor 5 according to another embodiment. FIG. 7 is a graph showing the relationship between the motor input X and the motor output Z.
As shown in FIG. 6, the motor 4 is driven by an output (motor output) Z by being supplied with electric power (motor input X). The motor output Z is input to the compressor 5 as rotational energy having a torque T and a rotational speed N, and the compressor 5 is driven with an output Y.
The motor output Z is calculated by the following equation (3), for example.

Here, Z is the motor output (kW), T is the torque [kg · m (N / m / 9.8)], and N is the rotational speed (min ⁻¹ ). In this case, the case of obtaining the actual output Z ₁ of the motor 4, by a sensor or the like, for detecting the torque and rotational speed of the motor 4.

In the graph shown in FIG. 7, the design output Z ₀ of the motor 4 with respect to the power supplied to the motor 4 (motor input X) is indicated by a straight line 102. In abnormal point identifying section 26, the actual output based on Z ₁ and comparative design output value Z ₀ result, abnormality occurrence location is the compressor 5 or the motor of the motor 4 corresponding to the power supplied to the motor 4 (motor input) 4 is specified.
For example, when the difference between the motor actual output Z ₁ corresponding to the motor supply power and the design output value Z ₀ is within the allowable range, it is considered that the abnormality occurrence location is not the motor 4 but the compressor 5. On the other hand, when the difference between the motor actual output Z ₁ and the design output value Z ₀ corresponding to the motor supply electric power exceeds the allowable range, the abnormality occurrence location is considered to be the motor 4 instead compressor 5. Thus, based on the comparison result of the motor actual output Z ₁ and the design output value Z ₀ corresponding to the motor supply electric power, it is possible to identify the abnormal location.

ここで、Ｚ’はモータ出力補正値(kW)、Ｚ_１はモータの実際出力(kW)、ρ_０はサンプルガスの密度、ρはセンサ２１によって検出された採掘ガス５４の密度である。
このように、モータ４の実際出力Ｚ_１を状態量によって補正した出力補正値Ｚ’と、設計出力値Ｚ_０との比較結果に基づいて異常の発生箇所を特定することによって、採掘ガス５４の状態量の変動に関わらず、異常箇所を高精度に特定することができる。 Further, the abnormal location specifying unit 26 may use, as the actual output Z ₁ of the motor 4, an output correction value Z ′ obtained by correcting the actual output Z ₁ with the state quantity. In that case, the abnormality location specifying unit 26 determines whether the location where the abnormality occurs is the compressor 5 or the motor based on the comparison result between the output correction value Z ′ obtained by correcting the actual output Z ₁ by the state quantity and the design output value Z _0. 4 is specified.
For example, when the state quantity is density, the output correction value Z ′ of the motor 4 is calculated by the following equation (4).

Here, Z ′ is the motor output correction value (kW), Z ₁ is the actual output (kW) of the motor, ρ ₀ is the density of the sample gas, and ρ is the density of the mining gas 54 detected by the sensor 21.
Thus, by specifying the location where the abnormality occurs based on the comparison result between the output correction value Z ′ obtained by correcting the actual output Z ₁ of the motor 4 by the state quantity and the design output value Z ₀ , Regardless of the variation of the state quantity, it is possible to identify the abnormal part with high accuracy.

Next, with reference to FIG. 8, the abnormality detection method of the mining gas compression system 1 is demonstrated. In the following description, the reference numerals shown in FIGS. 1 to 7 are used as appropriate.
As shown in FIG. 8, when the motor 4 and the compressor 5 are operating in the rated operation state in step S1, the state quantity of the mining gas 54 flowing into the compressor 5 in step S2 (state quantity detection step). The sensor 21 detects (for example, density). In step S3 (reference correlation acquisition step), a known reference correlation 100 between the power supplied to the motor 4 (motor input X) and the reference output Y of the compressor 5 with respect to the sample gas having a known reference state quantity. Keep getting.

Then, the motor in the case in In step S4 (output correction step), the actual output Y ₁ of the compressor 5 is corrected based on the state quantity of mining gas 54 is detected by the sensor 21, mining gas 54 has a reference state amount The output correction value Y ′ of the compressor 5 corresponding to the power supplied to the motor 4 (motor input X) is calculated. For example, the actual output Y ₁ of the compressor 5 obtained by the above equation (1) is corrected by the above equation (2), and the output correction value Y ′ of the compressor 5 is calculated.

In step S5 to step S7 (abnormality detection step), based on the comparison result between the relationship between the power supplied to the motor 4 (motor input X) and the output correction value Y ′ of the compressor 5 and the reference correlation 100. Detecting abnormalities in the mining gas compression system 1.
For example, the determination in step S5, the reference output Y ₀ of the compressor 5 that corresponds to the power supplied to the motor 4 at the reference correlation 100, whether or not the difference D between the output correction value Y 'exceeds the first threshold value and the difference D between the reference output Y ₀ and the output correction value Y 'of the compressor 5 is in the case does not exceed the first threshold value it is determined that no abnormality mining gas compression system 1 in step S6, the step S1 Return to continue rated operation. On the other hand, determines the difference D of the reference output Y ₀ of the compressor 5 and the output correction value Y 'is a case of exceeding the first threshold value, in step S7, a malfunction occurs in the mining gas compression system 1.

Subsequently, the following steps may be performed.
If it is determined that there is abnormality in the mining gas compression system 1, in step S8~ step S10 (abnormal point identifying step), the actual output Z ₁ and design of the motor 4 corresponding to the fourth power supply to the motor (motor input X) Based on the comparison result of the output value Z ₀ , it is specified which of the compressor 5 and the motor 4 is where the abnormality has occurred.

For example, in step S8, the difference between the actual output Z ₁ and the design output value Z ₀ of the motor 4 as compared to the fifth threshold value, the difference is a fifth threshold value and the actual output Z ₁ and the design output value Z ₀ of the motor 4 If it is smaller, it is determined in step S9 that the compressor 5 is abnormal. On the other hand, it determines the difference between the actual output Z ₁ and the design output value Z ₀ of the motor 4 is to exceed the fifth threshold value, that there is abnormality in the motor 4 at step S10. Alternatively, the abnormal point identifying step may compare the deviation rate and the sixth threshold value of the design output value Z ₀ to the actual output Z ₁ of the motor 4.

  As described above, according to the embodiment of the present invention, even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54, an abnormality as a precursor of a failure of the mining gas compression system 1 is detected. Can be detected.

Moreover, in one Embodiment, the mining gas compression system 1 shown in FIG. 1 is provided with the abnormality detection apparatus 20 mentioned above. That is, the mining gas compression system 1 includes the compressor 5 for boosting the mining gas 54, the motor 4 for driving the compressor 5, and the abnormality detection device 20 described above.
Thereby, even if the operating range of the compressor 5 is uncertain due to fluctuations in the state quantity of the mining gas 54, it is possible to detect an abnormality as a precursor of a failure of the mining gas compression system 1. Therefore, it is possible to avoid long-term shutdown due to a sudden failure of the mining gas compression system 1, and improve the profitability of the gas mining company.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expression “comprising”, “including”, or “having” one constituent element is not an exclusive expression that excludes the presence of the other constituent elements.

DESCRIPTION OF SYMBOLS 1 Mining gas compression system 2 Motor integrated compressor 3 Casing 4 Compressor 5 Motor 6 Output shaft 8 Gas-liquid separator 11 Platform 12 Tanker 20 Abnormality detector 21 Sensor 22 Arithmetic processor 23 Reference correlation acquisition part 24 Output correction part 25 Anomaly Detection Unit 26 Abnormal Location Identification Unit 27 Storage Unit 50 Sea Surface 51 Sea Bed 52 Gas Field

Claims (9)

An abnormality detection device for a mining gas compression system having a compressor for boosting a mining gas and a motor for driving the compressor,
A sensor for detecting a state quantity of the mining gas flowing into the compressor;
A reference correlation acquisition unit for acquiring a known reference correlation between power supplied to the motor and output of the compressor with respect to a sample gas having a known reference state quantity;
The compressor that corrects the actual output of the compressor based on the state quantity of the mining gas detected by the sensor, and that corresponds to the power supplied to the motor when the mining gas has the reference state quantity. An output correction unit for calculating the output correction value of
Based on the comparison result between the relationship between the power supplied to the motor and the output correction value and the reference correlation, an abnormality detection unit for detecting an abnormality of the mining gas compression system;
An abnormality detection device for a mining gas compression system.   When an abnormality of the mining gas compression system is detected by the abnormality detection unit, based on a comparison result between the actual output of the motor and the design output value corresponding to the power supplied to the motor, the occurrence location of the abnormality is The abnormality detection device for a mining gas compression system according to claim 1, further comprising an abnormality location identification unit configured to identify whether the compressor or the motor.   The abnormality detection unit has a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit exceeds a first threshold. The abnormality detection device for a mining gas compression system according to claim 1, wherein the abnormality detection device is configured to determine that an abnormality has occurred in the mining gas compression system.   The abnormality detection unit has a deviation rate of the output correction value calculated by the output correction unit with respect to a reference output of the compressor corresponding to power supplied to the motor in the reference correlation exceeds a second threshold value. The abnormality detection device for a mining gas compression system according to claim 1, wherein the abnormality detection device is configured to determine that an abnormality has occurred in the mining gas compression system.   The abnormality detection unit is a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit, or for the reference output 3. The apparatus according to claim 1, wherein when the period in which the deviation rate of the output correction value exceeds a third threshold continues for a specified time or more, it is determined that an abnormality has occurred in the mining gas compression system. An abnormality detection device for a mining gas compression system according to claim 1.   The abnormality detection unit is a difference between a reference output of the compressor corresponding to power supplied to the motor in the reference correlation and the output correction value calculated by the output correction unit, or for the reference output 3. The apparatus according to claim 1, wherein when the increase rate of the deviation rate of the output correction value exceeds a fourth threshold, it is determined that an abnormality has occurred in the mining gas compression system. 4. Anomaly detector for mining gas compression system. A compressor for boosting the mining gas;
A motor for driving the compressor; and
A mining gas compression system comprising the abnormality detection device according to any one of claims 1 to 6. A method for detecting an abnormality in a mining gas compression system having a compressor for boosting a mining gas and a motor for driving the compressor,
A state quantity detection step of detecting a state quantity of the mining gas flowing into the compressor;
A reference correlation obtaining step for obtaining a known reference correlation between power supplied to the motor and output of the compressor with respect to a sample gas having a known reference state quantity;
The compressor that corrects the actual output of the compressor based on the state quantity of the mining gas detected by the sensor, and that corresponds to the power supplied to the motor when the mining gas has the reference state quantity. An output correction step for calculating an output correction value of
An abnormality detection step for detecting an abnormality of the mining gas compression system based on a comparison result between the relationship between the power supplied to the motor and the output correction value and the reference correlation;
An abnormality detection method for a mining gas compression system.   When an abnormality of the mining gas compression system is detected in the abnormality detection step, the occurrence location of the abnormality is determined based on the comparison result of the actual output and the design output value of the motor corresponding to the power supplied to the motor. The abnormality detection method for a mining gas compression system according to claim 8, further comprising an abnormality location identification step for identifying whether the compressor or the motor.

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