JP6952622B2 - Performance evaluation method, performance evaluation device, and performance evaluation system - Google Patents

Description

The present invention relates to a performance evaluation method, a performance evaluation device, and a performance evaluation system.

Conventionally, a multi-stage centrifugal compressor equipped with a multi-stage impeller is widely used as a compressor used in a plant or the like. In such a compressor, a mixed gas in which a plurality of gases are mixed flows in as a working gas. The inflowing mixed gas is boosted by the impeller and discharged from the compressor.

In such a compressor, an abnormality during operation is detected by monitoring the performance during operation. For example, Patent Document 1 describes a monitoring method for monitoring various parameter values during operation of a compressor in real time and determining whether or not the performance is actually within an allowable value. ing.

U.S. Patent Application Publication No. 2015/0057973

By the way, in a compressor, not only such a method but also a change in performance during operation is required to be monitored with higher accuracy.

The present invention has been made in order to meet the above problems, and provides a performance evaluation method, a performance evaluation device, and a performance evaluation system capable of confirming changes in the performance of a compressor during operation with high accuracy. The purpose is to do.

The present invention employs the following means in order to solve the above problems.
The performance evaluation method according to the first aspect of the present invention is a performance evaluation method for evaluating the performance of a compressor into which a mixed gas in which a plurality of gases are mixed flows, and corresponds to each of a plurality of rotation speeds of the compressor. A plurality of said Mach number acquisition steps for acquiring each of the mechanical Mach numbers and a prediction performance curve which is a curve showing the correlation between the efficiency of the compressor and the flow coefficient of the compressor. Among the prediction performance curve acquisition process acquired in each of the prediction performance curve acquisition steps corresponding to the number of machine Mach and the plurality of prediction performance curves acquired in the prediction performance curve acquisition process, the prediction performance curve with the reference machine Mach number is used. When selected as the reference prediction performance curve and the flow coefficient is the same, the efficiency value in the prediction performance curve at another mechanical Mach number is the efficiency value in the selected reference prediction performance curve. The correction value acquisition step of acquiring the correction value to match each of the plurality of mechanical Mach numbers and the plurality of flow coefficients, and at least the mixed gas flowing into the inflow port of the compressor during operation. The measurement value acquisition step of acquiring the pressure, temperature, and flow rate as inlet measurement values, and acquiring at least the pressure and temperature of the mixed gas flowing out from the outlet of the compressor during operation as outlet measurement values, and the inlet measurement. An efficiency acquisition step of acquiring the efficiency of the compressor at the time of acquiring various measured values in the measured value acquisition step based on the pressure and temperature of the values and the pressure and temperature of the outlet measured values. In the flow coefficient acquisition step of acquiring the flow coefficient of the compressor at the time of acquisition and the efficiency acquisition step based on the flow rate of the inlet measurement value and the rotation speed of the compressor at the time of acquisition. The acquired efficiency includes an acquisition value correction step of correcting the acquired efficiency with the correction value corresponding to the mechanical Mach number of the compressor at the time of acquisition and the flow coefficient acquired in the flow coefficient acquisition step.

According to such a configuration, the correction value is acquired by using the machine Mach number. By correcting the efficiency of the compressor during operation using this correction value, it is possible to acquire the efficiency of the compressor as the efficiency when operating with the machine Mach number corresponding to the reference prediction performance curve. Therefore, regardless of the actual rotation speed of the compressor in operation, the performance of the compressor can be evaluated with reference to one mechanical Mach number. As a result, the influence of the change in the rotation speed of the compressor can be suppressed, and the relationship between the efficiency and the flow coefficient in the compressor can be confirmed with high accuracy.

Further, in the performance evaluation method according to the second aspect of the present invention, in the first aspect, as a curve showing the correlation between the efficiency and the flow coefficient when the compressor is operated in the target state in advance. A determination step of acquiring a predetermined target performance curve and determining whether or not the efficiency corrected in the acquired value correction step deviates from the acquired target performance curve may be further included.

According to such a configuration, by determining whether or not the flow coefficient and the corrected efficiency deviate from the target performance curve, an abnormality has occurred compared with the operating state of the target compressor. It is possible to grasp the abnormality of the compressor at an early stage.

Further, in the performance evaluation method according to the third aspect of the present invention, in the first or second aspect, the flow coefficient acquired in the flow coefficient acquisition step and the efficiency corrected in the acquisition value correction step are added. Based on this, a correction performance curve acquisition step of acquiring the correction performance curve as a curve showing the correlation between the flow coefficient and the corrected efficiency may be further included.

According to such a configuration, the performance of the current compressor can be evaluated by using the correction performance curve. Then, by comparing the correction performance curve and the target performance curve, it is possible to easily compare the current performance of the compressor with the initial target performance.

Further, the performance evaluation device according to the fourth aspect of the present invention is a performance evaluation device that evaluates the performance of a compressor into which a mixed gas in which a plurality of gases are mixed flows, and has a plurality of rotation speeds of the compressor. The Mach number acquisition unit obtains a predetermined mechanical Mach number according to each, and the Mach number acquisition unit obtains a prediction performance curve which is a curve showing the correlation between the efficiency of the compressor and the flow coefficient of the compressor. Among the prediction performance curve acquisition unit acquired for each of the plurality of machine Mach numbers acquired in the above and the plurality of prediction performance curves acquired by the prediction performance curve acquisition unit, the said machine Mach number as a reference. When the prediction performance curve is selected as the reference prediction performance curve and the flow coefficient is the same, the value of the efficiency in the prediction performance curve at another mechanical Mach number is set in the selected reference prediction performance curve. A correction value acquisition unit that acquires a correction value that matches the efficiency value corresponding to each of the plurality of mechanical Mach numbers and the plurality of flow coefficients, and the correction value that flows into the inflow port of the compressor during operation. With a measurement value acquisition unit that acquires at least the pressure, temperature, and flow rate of the mixed gas as inlet measurement values, and acquires at least the pressure and temperature of the mixed gas flowing out from the outlet of the compressor during operation as outlet measurement values. , The efficiency of the compressor at the time of acquiring various measured values by the measured value acquisition unit is acquired based on the pressure and temperature of the inlet measured values and the pressure and temperature of the outlet measured values. The efficiency acquisition unit, the flow coefficient acquisition unit that acquires the flow coefficient of the compressor at the time of acquisition based on the flow rate of the inlet measurement values and the rotation speed of the compressor at the time of acquisition, and the above. Acquisition value correction that corrects the efficiency value acquired by the efficiency acquisition unit with the correction value corresponding to the mechanical Mach number of the compressor at the time of acquisition and the flow coefficient acquired by the flow coefficient acquisition unit. It has a part.

Further, in the performance evaluation device according to the fifth aspect of the present invention, in the fourth aspect, as a curve showing the correlation between the efficiency and the flow coefficient when the compressor is operated in the target state in advance. A determination unit that acquires a predetermined target performance curve and determines whether or not the efficiency corrected by the acquired value correction unit deviates from the acquired target performance curve may be further provided.

Further, in the performance evaluation device according to the sixth aspect of the present invention, in the fourth or fifth aspect, the flow coefficient acquired by the flow coefficient acquisition unit and the efficiency corrected by the acquisition value correction unit are obtained. Based on this, a correction performance curve acquisition unit that acquires the correction performance curve as a curve showing the correlation between the flow coefficient and the corrected efficiency may be further provided.

Further, the performance evaluation system according to the seventh aspect of the present invention includes the performance evaluation device according to any one of the fourth to sixth aspects, the compressor into which the mixed gas flows, and the inflow port of the compressor during operation. An inlet measuring unit that measures at least the pressure, temperature, and flow rate of the mixed gas flowing into the compressor and sends it to the performance evaluation device as an inlet measurement value, and the mixed gas flowing out from the outlet of the compressor during operation. It is provided with an outlet measuring unit that measures at least pressure and temperature and sends them as outlet measured values to the performance evaluation device.

According to the present invention, it is possible to confirm the change in the performance of the compressor during operation with high accuracy.

It is a schematic diagram which shows the performance evaluation system of embodiment of this invention. It is a figure which shows the hardware composition of the performance evaluation apparatus of embodiment of this invention. It is a functional block diagram of the performance evaluation apparatus of embodiment of this invention. It is a graph which shows an example at the time of acquiring the correction value from the prediction performance curve for each machine Mach number in the embodiment of this invention. It is a graph which shows an example of the relationship between the reference prediction performance curve acquired by embodiment of this invention, and a correction performance curve. It is a flow chart which shows the performance evaluation method of embodiment of this invention.

Hereinafter, the performance evaluation system 1 according to the embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, in the performance evaluation system 1, the compressor 20, the upstream line 30 connected to the inlet of the compressor 20, the downstream line 40 connected to the outlet of the compressor 20, and the compressor 20 are in operation. A measuring unit 50 for measuring the state of the mixed gas and a performance evaluation device 10 for evaluating the performance of the compressor 20 are provided.

A mixed gas in which a plurality of gases are mixed flows into the compressor 20 from the upstream line 30. The compressor 20 compresses the inflowing mixed gas and discharges it to the downstream line 40. The compressor 20 of the present embodiment is a uniaxial multi-stage centrifugal compressor installed in, for example, a plant or the like.

The measuring unit 50 measures the state of the mixed gas flowing into the compressor 20 in operation or the mixed gas flowing out of the compressor 20. The measuring unit 50 of the present embodiment includes an inlet measuring unit 51 and an outlet measuring unit 52.

The inlet measuring unit 51 is provided at a suction port (inflow port) 21 for allowing the mixed gas to flow into the inside of the compressor 20. The inlet measuring unit 51 measures the pressure, temperature, and flow rate of the mixed gas before compression measured at the suction port 21. The entrance measurement unit 51 sends the information of the measurement result to the performance evaluation device 10 as the entrance measurement value MV1. Here, among the inlet measured values MV1, the measured pressure is referred to as an inlet pressure Ps, the measured temperature is referred to as an inlet temperature Ts, and the measured flow rate is referred to as an inlet flow rate Q.

The outlet measuring unit 52 is provided at the discharge port (outlet) 22 that allows the mixed gas to flow out to the outside in the compressor 20. The outlet measuring unit 52 measures the pressure and temperature of the compressed mixed gas measured at the discharge port 22. The outlet measuring unit 52 sends the information of the measurement result to the performance evaluation device 10 as the outlet measured value MV2. Here, among the outlet measured values MV2, the measured pressure is referred to as an outlet pressure Pd, and the measured temperature is referred to as an outlet temperature Td.

The performance evaluation device 10 evaluates the performance of the compressor 20 based on the efficiency η of the compressor 20 and the flow coefficient φ. As shown in FIG. 2, the performance evaluation device 10 includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a storage unit 104, and a signal receiving module (receiver) 105. It is a computer equipped. Information on the measurement result output from the measuring unit 50 and information on the compressor 20 in operation are input to the signal receiving module 105.

The CPU 101 is a processor that controls the entire operation of the performance evaluation device 10. The CPU 101 exerts various functions described later by operating according to a program prepared in advance.

The ROM 102 is a non-volatile memory that cannot be rewritten. The RAM 103 is a rewritable volatile memory. The ROM 102 and the RAM 103 are also called main storage devices, and programs for the CPU 101 to exert various functions and operate are developed.

The storage unit 104 is a large-capacity storage device (nonvolatile memory) built in the performance evaluation device 10, and is, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like. The storage unit 104 is also called an auxiliary storage device, and stores necessary information in advance such as data unique to the compressor 20 and each gas, which will be described later, and data acquired by a preliminary test or simulation.

As shown in FIG. 3, the CPU 101 of the performance evaluation device 10 executes a program stored in its own device in advance to control the control unit 111, the Mach number acquisition unit 121, the prediction performance curve acquisition unit 131, and the correction value acquisition unit 141. Each function of the measurement value acquisition unit 151, the efficiency acquisition unit 161, the flow coefficient acquisition unit 171, the acquisition value correction unit 181 and the determination unit 191 and the correction performance curve acquisition unit 201 is exhibited.

The control unit 111 performs various controls such as starting and stopping the compressor 20 and starting and ending the performance evaluation process.

The Mach number acquisition unit 121 acquires the mechanical Mach number Mm determined according to the rotation speed of the compressor 20. The mechanical Mach number Mm can be calculated from the following equation (1). Information on the machine Mach number Mm corresponding to each rotation speed is stored in the storage unit 104 in advance. The Mach number acquisition unit 121 of the present embodiment acquires the mechanical Mach number Mm corresponding to each of the plurality of rotation speeds from the storage unit 104.

Here, the representative peripheral speed U of the impeller in the equation (1) is a constant determined in advance according to the rotation speed of the compressor 20, and is acquired in accordance with the rotation speed of the compressor 20. The representative peripheral speed U of the impeller of the present embodiment is the peripheral speed of the impeller of an arbitrary stage in the compressor 20 operating at an arbitrary rotation speed. The representative peripheral speed U of the impeller is, for example, the peripheral speed of the first-stage impeller operating at an arbitrary rotation speed.

Further, the sound velocity a in the equation (1) is a constant determined by the type of the mixed gas, and is the sound velocity of the mixed gas sucked into the compressor 20.

As shown in FIG. 4, the prediction performance curve acquisition unit 131 acquires the prediction performance curve for each of a plurality of machine Mach numbers Mm. The prediction performance curve is a curve showing the correlation between the efficiency η of the compressor 20 and the flow coefficient φ of the compressor 20. Specifically, the predicted performance curve is obtained by conducting a test or simulation in advance and acquiring the efficiency η and the flow coefficient φ of the compressor 20 according to the mechanical Mach number Mm, and is stored in the storage unit 104 in advance. Has been done. The prediction performance curve acquisition unit 131 of the present embodiment acquires the prediction performance curve corresponding to the machine Mach number Mm acquired by the Mach number acquisition unit 121 from the storage unit 104.

The correction value acquisition unit 141 selects and acquires a reference prediction performance curve from a plurality of prediction performance curves acquired by the prediction performance curve acquisition unit 131. The reference prediction performance curve is a prediction performance curve corresponding to the reference machine Mach number Mm (for example, the broken line in the middle in FIG. 4). The reference mechanical Mach number Mm is, for example, a mechanical Mach number Mm corresponding to the rotation speed of the compressor 20 selected by the evaluator (the rotation speed of the compressor 20 is 100%, etc.). The correction value acquisition unit 141 includes a reference prediction performance curve (for example, the middle line in FIG. 4) and a prediction performance curve at another machine Mach number Mm (for example, the upper and lower lines with respect to the reference prediction performance curve in FIG. 4). The correction value is obtained from the relationship of. Specifically, the correction value is a value that matches the value of efficiency η in the prediction performance curve at another machine Mach number Mm with the value of efficiency η in the reference prediction performance curve when the flow coefficient φ is the same. Is. The correction value is calculated as the difference between the efficiency η on the reference prediction performance curve and the efficiency η on other prediction performance curves at an arbitrary flow coefficient φ. The correction value acquisition unit 141 acquires a plurality of correction values so as to correspond to each of the plurality of mechanical Mach numbers Mm and the plurality of flow coefficient φ.

The measurement value acquisition unit 151 acquires the inlet measurement value MV1 and the outlet measurement value MV2. That is, the measurement value acquisition unit 151 acquires the information of the mixed gas measured by the measurement unit 50.

When the efficiency acquisition unit 161 acquires various measurement values by the measurement value acquisition unit 151 based on the inlet measurement value MV1, the outlet measurement value MV2, and the predetermined specific heat ratio k of the mixed gas (measurement in the present embodiment). The efficiency η of the compressor 20 at the time when various measured values are measured by the unit 50, hereinafter simply referred to as the measurement time) is acquired. Specifically, the polytropic index n is calculated from the following equation (2) based on the inlet pressure Ps, the inlet temperature Ts, the outlet pressure Pd, and the outlet temperature Td.

The efficiency acquisition unit 161 calculates the efficiency η of the compressor 20 from the following equation (3) based on the calculated polytropic index n and the specific heat ratio k. The specific heat ratio k is predetermined and a constant according to the type of the mixed gas, and is stored in the storage unit 104 in advance.

The flow coefficient acquisition unit 171 acquires the flow coefficient φ, which is one of the dimensionless parameters indicating the performance of the compressor 20. The flow coefficient acquisition unit 171 acquires the flow coefficient φ of the compressor 20 based on the inlet flow rate Q and the rotation speed of the compressor 20 in operation at the time of measurement. Specifically, the flow coefficient φ is acquired based on the following equation (4).

Here, the representative diameter D of the impeller in the equation (4) is a constant determined in advance according to the compressor 20, and is a value stored in the storage unit 104 in advance. The representative diameter D of the impeller of the present embodiment is the diameter of the impeller of any stage in the compressor 20. As the representative diameter D of the impeller, for example, the diameter of the first-stage impeller is set as the representative diameter D.

The acquisition value correction unit 181 uses the mechanical Mach number Mm calculated from the rotation speed of the compressor 20 at the time of measurement and the flow coefficient φ acquired by the flow coefficient acquisition unit 171 for the value of the efficiency η acquired by the efficiency acquisition unit 161. Correct with the correction value according to. Specifically, the acquired value correction unit 181 calculates the mechanical Mach number Mm from the rotation speed of the compressor 20 during operation. The corrected efficiency η is obtained by adding the calculated machine Mach number Mm and the correction value corresponding to the acquired flow coefficient φ to the acquired efficiency η.

The determination unit 191 acquires the target performance curve stored in the storage unit 104 in advance. The target performance curve is predetermined according to the compressor 20 as a curve showing the correlation between the efficiency η and the flow coefficient φ when the compressor 20 is operated in the target state.

The target performance curve in the determination unit 191 may be the same as the reference prediction performance curve. Further, the target performance curve may be the same as other prediction performance curves acquired by the prediction performance curve acquisition unit 131 other than the reference prediction performance curve. Further, the target performance curve may be newly acquired separately from the one acquired by the prediction performance curve acquisition unit 131.

The determination unit 191 determines whether or not the efficiency η corrected by the acquisition value correction unit 181 and the flow coefficient φ acquired by the flow coefficient acquisition unit 171 deviate from the acquired target performance curve. When the acquired efficiency η and flow coefficient φ deviate from the target performance curve, it indicates that an abnormality has occurred in the compressor 20 such as a decrease in the performance of the compressor 20 itself.

The correction performance curve acquisition unit 201 acquires a correction performance curve (solid line in FIG. 5) based on the efficiency η corrected by the acquisition value correction unit 181 and the flow coefficient φ acquired by the flow coefficient acquisition unit 171. .. The correction performance curve is a curve showing the correlation between the corrected value of the efficiency η of the compressor 20 in operation at the time of measurement and the flow coefficient φ. As shown in FIG. 5, by comparing the acquired correction performance curve (solid line in FIG. 5) with the target performance curve (broken line in FIG. 5), the initial performance of the compressor 20 and the current performance of the compressor 20 are compared. The difference between the state and the state is grasped.

Next, the performance evaluation method S1 based on the performance evaluation system 1 of the present embodiment will be described with reference to FIG. The performance evaluation method S1 of the present embodiment includes a Mach number acquisition process S2, a prediction performance curve acquisition process S3, a correction value acquisition process S4, a measured value acquisition process S5, an efficiency acquisition process S6, a flow coefficient acquisition process S7, and an acquisition value correction process. Each step of S8, the determination step S9, and the correction performance curve acquisition step S10 is included.

In the Mach number acquisition step S2, the mechanical Mach number Mm in the compressor 20 based on the equation (1) is acquired by the Mach number acquisition unit 121 according to each of the plurality of rotation speeds. In the Mach number acquisition step S2, one mechanical Mach number Mm corresponding to one rotation speed is acquired. As a result, in the Mach number acquisition step S2, a plurality of mechanical Mach numbers Mm are acquired according to the plurality of rotation speeds to be evaluated in the operating range of the compressor 20.

In the prediction performance curve acquisition step S3, tests and simulations are performed in advance, and prediction performance curves are acquired for each of a plurality of machine Mach numbers Mm. In the prediction performance curve acquisition step S3, one prediction performance curve corresponding to one machine Mach number Mm is acquired. As a result, in the prediction performance curve acquisition step S3, a plurality of prediction performance curves corresponding to the mechanical Mach number Mm are acquired by the prediction performance curve acquisition unit 131 so as to correspond to the plurality of rotation speeds evaluated by the compressor 20. ..

In the correction value acquisition step S4, the machine Mach number Mm as a reference by the evaluator based on the rotation speed of the compressor 20 at the time of measurement (for example, the machine Mach number Mm corresponding to 100% of the rotation speed of the compressor 20). Is selected. The prediction performance curve corresponding to the selected machine Mach number Mm is acquired by the correction value acquisition unit 141 as the reference prediction performance curve. In the correction value acquisition step S4, the correction value is acquired from the relationship between the reference prediction performance curve and the prediction performance curve at another machine Mach number Mm (for example, the upper and lower lines with respect to the reference prediction performance curve in FIG. 4). In the correction value acquisition step S4, the correction value acquisition unit 141 calculates the correction value as the difference between the efficiency η on the reference prediction performance curve at an arbitrary flow coefficient φ and the efficiency η on another prediction performance curve. .. A plurality of correction values are acquired corresponding to the number of a plurality of mechanical Mach numbers for one flow coefficient φ.

In the measured value acquisition step S5, the state of the mixed gas measured by the measuring unit 50 is acquired. The measurement value acquisition step S5 of the present embodiment includes an inlet measurement step S51 and an outlet measurement step S52.

In the inlet measurement step S51, the inlet measurement value MV1 is acquired by sending the measurement result measured by the inlet measurement unit 51 to the measurement value acquisition unit 151. In the outlet measurement step S52, the outlet measurement value MV2 is acquired by sending the measurement result measured by the outlet measurement unit 52 to the measurement value acquisition unit 151. Further, in the measurement value acquisition step S5, the rotation speed of the compressor 20 at the time of measurement is acquired.

In the efficiency acquisition step S6, the efficiency η of the compressor 20 is the efficiency acquisition unit 161 based on the inlet pressure Ps, the inlet temperature Ts, the outlet pressure Pd, and the outlet temperature Td, and the above equations (2) and (3). Calculated by. As a result, in the efficiency acquisition step S6, the efficiency η of the compressor 20 at the time of measurement is acquired.

In the flow coefficient acquisition step S7, the inlet flow rate Q, the representative peripheral speed U which is the peripheral speed of the first-stage impeller calculated from the rotation speed of the compressor 20 in operation at the time of measurement, and the above-mentioned equation (4). The flow coefficient φ is calculated by the flow coefficient acquisition unit 171 based on the above. As a result, in the flow coefficient acquisition step S7, the flow coefficient φ of the compressor 20 at the time of measurement is acquired.

In the acquisition value correction step S8, the value of the efficiency η acquired in the efficiency acquisition step S6 corresponds to the mechanical Mach number Mm of the compressor 20 at the time of measurement and the flow coefficient φ acquired in the flow coefficient acquisition step S7. It is corrected by the correction value. Specifically, in the acquisition value correction step S8, the acquisition value correction unit 181 calculates the mechanical Mach number Mm from the rotation speed of the compressor 20 during operation. By adding the calculated machine Mach number Mm and the correction value corresponding to the acquired flow coefficient φ to the acquired efficiency η, the corrected efficiency η is acquired by the acquired value correction unit 181.

In the determination step S9, the target performance curve is acquired in advance according to the target state when the compressor 20 is operated. In the determination step S9, the determination unit 191 determines whether or not the efficiency η corrected in the acquisition value correction step S8 and the flow coefficient φ acquired in the flow coefficient acquisition step S7 deviate from the target performance curve. ..

In the correction performance curve acquisition step S10, the correction performance curve is acquired by the correction performance curve acquisition unit 201 based on the efficiency η corrected in the acquisition value correction step S8 and the flow coefficient φ acquired in the flow coefficient acquisition step S7. Will be done.

According to the performance evaluation device 10 and the performance evaluation method S1 as described above, the mechanical Mach number Mm is acquired based on the above equation (1). A correction value for the reference prediction performance curve is calculated using this mechanical Mach number Mm. By correcting the efficiency η of the compressor 20 during operation using this correction value, the efficiency η of the compressor 20 can be set as the efficiency η when operating at a machine Mach number Mm corresponding to the reference prediction performance curve. Can be calculated. Therefore, regardless of the actual rotation speed of the compressor 20 during operation, the performance of the compressor 20 can be evaluated with reference to one mechanical Mach number Mm. Thereby, the influence of the change in the rotation speed of the compressor 20 can be suppressed, and the relationship between the efficiency η and the flow coefficient φ in the compressor 20 can be confirmed with high accuracy.

Conventionally, during the operation of the compressor 20, it is necessary to monitor the efficiency η of the compressor 20 in real time to confirm whether or not an abnormality has occurred in the compressor 20 and a performance deterioration has occurred. However, the compressor 20 is often operated with a constant head, and in such a case, the compressor 20 is operated while the rotation speed fluctuates. Therefore, even if the efficiency η of the compressor 20 at the time of measurement is acquired, the value of the efficiency η varies every time it is acquired due to the difference in the mechanical Mach number Mm caused by the difference in the rotation speed of the compressor 20. It will occur. As a result, it becomes difficult to accurately grasp the performance of the compressor 20. However, according to the performance evaluation device 10 and the performance evaluation method S1 as described above, the influence of the change in the rotation speed of the compressor 20 can be suppressed, and the change in the performance of the compressor 20 during operation can be confirmed with high accuracy. can do.

Further, by determining whether or not the flow coefficient φ and the corrected efficiency η deviate from the target performance curve, the current compressor such that an abnormality has occurred compared with the operating state of the target compressor 20. 20 abnormalities can be grasped at an early stage.

Further, by acquiring the actual performance curve from the flow coefficient φ and the corrected efficiency η, the performance of the compressor 20 at the time of measurement can be evaluated using the actual performance curve. Then, by comparing the actual performance curve and the target performance curve, the current performance and the initial performance of the compressor 20 can be easily compared.

(Other variants of the embodiment)
Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations thereof in the respective embodiments are examples, and the configurations are added or omitted within the range not deviating from the gist of the present invention. , Replacements, and other changes are possible. Further, the present invention is not limited to the embodiments, but only to the scope of claims.

The performance evaluation device 10 is not limited to a structure having only the above-described configuration. For example, the performance evaluation device 10 may have a display unit that can be confirmed by an evaluator. In this case, by displaying various acquired values on the display unit, the evaluator can grasp the state of the mixed gas and the state of the compressor 20 in real time.

1 ... Performance evaluation system 20 ... Compressor 21 ... Suction port 22 ... Discharge port 30 ... Upstream line 40 ... Downstream line 50 ... Measurement unit 51 ... Inlet measurement unit MV1 ... Inlet measurement value Ps ... Inlet pressure Ts ... Inlet temperature Q ... Inlet Flow rate 52 ... Outlet measurement unit MV2 ... Outlet measurement value Pd ... Outlet pressure Td ... Outlet temperature 10 ... Performance evaluation device 101 ... CPU 102 ... ROM 103 ... RAM 104 ... Storage unit 105 ... Signal reception module 111 ... Control unit 121 ... Mach number Acquisition unit Mm ... Mechanical Mach number U ... Representative peripheral speed a ... Sound velocity 131 ... Prediction performance curve acquisition unit 141 ... Correction value acquisition unit 151 ... Measurement value acquisition unit 161 ... Efficiency acquisition unit k ... Specific heat ratio n ... Polytropic index η ... Efficiency 171 ... Flow coefficient acquisition unit φ ... Flow coefficient D ... Representative diameter 181 ... Acquisition value correction unit 191 ... Judgment unit 201 ... Correction performance curve acquisition unit S1 ... Performance evaluation method S2 ... Mach number acquisition process S3 ... Prediction performance curve acquisition process S4 ... Correction value acquisition process S5 ... Measurement value acquisition process S51 ... Entrance measurement process S52 ... Exit measurement process S6 ... Efficiency acquisition process S7 ... Flow coefficient acquisition process S8 ... Acquisition value correction process S9 ... Judgment process S10 ... Correction performance curve acquisition process

Claims (7)

It is a performance evaluation method that evaluates the performance of a compressor into which a mixed gas in which a plurality of gases are mixed flows.
A Mach number acquisition step for acquiring the mechanical Mach number corresponding to each of the plurality of rotation speeds of the compressor, and
Acquisition of predicted performance curves, which are curves showing the correlation between the efficiency of the compressor and the flow coefficient of the compressor, corresponding to the plurality of machine Mach numbers acquired in the Mach number acquisition process. Process and
When the prediction performance curve with the number of machine Mach as a reference is selected as the reference prediction performance curve from the plurality of prediction performance curves acquired in the prediction performance curve acquisition step, and the flow coefficient is the same. A correction value that matches the efficiency value in the prediction performance curve with another machine Mach number to the efficiency value in the selected reference prediction performance curve is set to a plurality of the machine Mach numbers and a plurality of the flow coefficients. The correction value acquisition process to be acquired corresponding to each of the coefficients, and
At least the pressure, temperature, and flow rate of the mixed gas flowing into the inlet of the compressor during operation are acquired as inlet measurement values, and at least the pressure of the mixed gas flowing out from the outlet of the compressor during operation. And the measurement value acquisition process that acquires the temperature as the outlet measurement value,
Efficiency of acquiring the efficiency of the compressor at the time of acquiring various measured values in the measured value acquisition step based on the pressure and temperature of the inlet measured values and the pressure and temperature of the outlet measured values. Acquisition process and
A flow coefficient acquisition step of acquiring the flow coefficient of the compressor at the time of acquisition based on the flow rate of the inlet measurement value and the rotation speed of the compressor at the time of acquisition.
Acquisition value correction step of correcting the efficiency acquired in the efficiency acquisition step with the correction value corresponding to the mechanical Mach number of the compressor at the time of acquisition and the flow coefficient acquired in the flow coefficient acquisition step. And, including performance evaluation methods. The target performance curve, which is predetermined as a curve showing the correlation between the efficiency and the flow coefficient when the compressor is operated in the target state, is acquired and corrected in the acquired value correction step. The performance evaluation method according to claim 1, further comprising a determination step of determining whether or not the efficiency deviates from the acquired target performance curve. A correction performance curve as a curve showing the correlation between the flow coefficient and the corrected efficiency based on the flow coefficient acquired in the flow coefficient acquisition step and the efficiency corrected in the acquisition value correction step. The performance evaluation method according to claim 1 or 2, further comprising a correction performance curve acquisition step of acquiring the above. It is a performance evaluation device that evaluates the performance of a compressor into which a mixed gas in which a plurality of gases are mixed flows.
A Mach number acquisition unit that acquires a predetermined mechanical Mach number according to each of the plurality of rotation speeds of the compressor, and a Mach number acquisition unit.
A prediction performance curve acquisition unit that acquires a prediction performance curve, which is a curve showing the correlation between the efficiency of the compressor and the flow coefficient of the compressor, for each of a plurality of the machine Mach numbers acquired by the Mach number acquisition unit. ,
When the prediction performance curve with the reference machine Mach number is selected as the reference prediction performance curve from the plurality of prediction performance curves acquired by the prediction performance curve acquisition unit, and the flow coefficient is the same. A correction value that matches the efficiency value in the prediction performance curve with another machine Mach number to the efficiency value in the selected reference prediction performance curve is set to a plurality of the machine Mach numbers and a plurality of the flow coefficients. The correction value acquisition unit that acquires each of the coefficients, and the correction value acquisition unit
At least the pressure, temperature, and flow rate of the mixed gas flowing into the inlet of the compressor during operation are acquired as inlet measurement values, and at least the pressure of the mixed gas flowing out from the outlet of the compressor during operation. And the measurement value acquisition unit that acquires the temperature as the outlet measurement value,
Efficiency of acquiring the efficiency of the compressor at the time of acquiring various measured values by the measured value acquisition unit based on the pressure and temperature of the inlet measured values and the pressure and temperature of the outlet measured values. Acquisition department and
A flow coefficient acquisition unit that acquires the flow coefficient of the compressor at the time of acquisition based on the flow rate of the inlet measurement value and the rotation speed of the compressor at the time of acquisition.
An acquisition value that corrects the efficiency value acquired by the efficiency acquisition unit with the correction value corresponding to the mechanical Mach number of the compressor at the time of acquisition and the flow coefficient acquired by the flow coefficient acquisition unit. A performance evaluation device equipped with a correction unit. The target performance curve, which is predetermined as a curve showing the correlation between the efficiency and the flow coefficient when the compressor is operated in the target state, is acquired and corrected by the acquired value correction unit. The performance evaluation device according to claim 4, further comprising a determination unit for determining whether or not the efficiency deviates from the acquired target performance curve. A correction performance curve as a curve showing the correlation between the flow coefficient and the corrected efficiency based on the flow coefficient acquired by the flow coefficient acquisition unit and the efficiency corrected by the acquired value correction unit. The performance evaluation device according to claim 4 or 5, further comprising a correction performance curve acquisition unit for acquiring the above. The performance evaluation device according to any one of claims 4 to 6,
The compressor into which the mixed gas flows and
An inlet measuring unit that measures at least the pressure, temperature, and flow rate of the mixed gas flowing into the inlet of the compressor during operation and sends it to the performance evaluation device as an inlet measurement value.
A performance evaluation system including an outlet measuring unit that measures at least the pressure and temperature of the mixed gas flowing out from the outlet of the compressor during operation and sends the mixed gas as an outlet measured value to the performance evaluation device.

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