Compressor system

Abstract

To easily acquire an optimal cleaning time and cleaning cycle when inside of a compressor is cleaned by using oil.SOLUTION: A compressor system includes: a compressor; a water supply section supplying water to the compressor; an oil supply section supplying oil to the compressor; and a supply control section controlling a supply state of the water and a supply state of the oil. The supply control section includes: a change rate acquisition section acquiring a change rate of efficiency of the compressor; a supply amount acquisition section acquiring supply amount of the oil; an operation cost acquisition section acquiring operation cost from the change rate; an oil cost acquisition section acquiring oil cost from the supply amount of the oil; and a cost relation acquisition section acquiring a plurality of provisional relation values indicating a relation between the operation cost and the oil cost in each of a plurality of provisional cleaning conditions.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a compressor system.

Background Art

[0002] A compressor is known as a device for compressing gas to generate high-pressure gas. The compressor includes a rotor that rotates around an axis, an impeller provided on the outer peripheral surface of the rotor, and a casing that forms a flow path by covering these rotor and impeller from the outer peripheral side. As the impeller rotates integrally with the rotor, the gas flowing through the flow path is compressed. The compressed gas is in a state where its temperature and pressure have increased compared to before compression.

[0003] Here, for example, when a gas containing an organic substance such as ethylene is circulated in a compressor, as the gas temperature rises, the compounds contained in the gas may polymerize inside the compressor to form a polymer called fouling. If such fouling adheres to the wall surface or impeller that forms the flow path, it may cause a decrease in the efficiency of the compressor. Further, if fouling adheres to the impeller, it may lead to vibrations caused by the imbalance of the rotor.

[0004] Therefore, for example, in the system described in Patent Document 1, data related to the operation of the compressor is collected, and based on the collected data, the polytropic efficiency of the compressor is calculated. Based on this polytropic efficiency, the degree of fouling formation in the compressor is specified and cleaning with oil or water is performed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, as countermeasures against fouling, there are a method of suppressing the occurrence of fouling itself by continuously supplying water into the compressor to lower the temperature inside the compressor, and a method of periodically supplying oil into the compressor to remove the formed fouling. In cleaning using oil, as the amount of fouling formed inside the compressor increases, the cleaning time, which is the time for continuously supplying oil, and the cleaning cycle, which is the cycle for supplying oil, increase. Since the oil used for cleaning is very expensive, the increase in the cleaning time and the cleaning cycle leads to an increase in the cleaning cost. On the other hand, the amount of fouling formed inside the compressor varies greatly depending on the plant in which the compressor is used and the operating period during which it has been used, and the cleaning time and the cleaning cycle cannot be set uniformly. Furthermore, a high level of skill is required to set the optimal cleaning time and cleaning cycle for the compressor. Therefore, there is a problem that the operator setting them may use excessive oil, resulting in an increase in the cleaning cost.

[0007] The present disclosure has been made to solve the above problems, and an object thereof is to provide a compressor system capable of easily obtaining an optimal cleaning time and cleaning cycle during cleaning inside the compressor with oil.

Means for Solving the Problems

[0008] To solve the above problems, a compressor system according to the present disclosure includes a compressor that compresses gas supplied to a flow path formed inside, a water supply unit that supplies water to the flow path inside the compressor during operation, an oil supply unit that supplies oil to the flow path inside the compressor to which the water is supplied, a supply control unit that controls the supply state of the water to the compressor in the water supply unit and the supply state of the oil to the compressor in the oil supply unit, and an oil information acquisition unit that acquires information on the supply situation of the oil supplied from the oil supply unit to the compressor. The supply control unit sends an instruction to the water supply unit to supply the water to the compressor, and is a cleaning instruction unit that sends an instruction to the oil supply unit to supply the oil to the compressor under cleaning conditions having a set cleaning time and cleaning cycle, a provisional cleaning instruction unit that sends an instruction to the oil supply unit to supply the oil to the compressor under a plurality of provisional cleaning conditions having different predetermined cleaning times and cleaning cycles, a change rate acquisition unit that acquires a change rate of the efficiency of the compressor from information on the operating status of the compressor, a supply amount acquisition unit that acquires the supply amount of the oil from the information on the supply situation of the oil acquired by the oil information acquisition unit, an operating cost acquisition unit that acquires the operating cost in the cleaning cycle from the change rate acquired by the change rate acquisition unit, an oil cost acquisition unit that acquires the oil cost in the cleaning time from the supply amount of the oil acquired by the supply amount acquisition unit, and a cost relationship acquisition unit that acquires a plurality of provisional relationship values that are the relationships between the operating cost and the oil cost under each of the plurality of provisional cleaning conditions from the operating cost acquired by the operating cost acquisition unit and the oil cost acquired by the oil cost acquisition unit.

Advantages of the Invention

[0009] According to the compressor system of the present disclosure, an optimal cleaning time and cleaning cycle during cleaning inside the compressor with oil can be easily obtained.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0011] Hereinafter, with reference to the accompanying drawings, a mode for implementing the compressor system 1 according to the present disclosure will be described. However, the present disclosure is not limited to this embodiment only.

[0012] <First Embodiment> (Configuration of Compressor System) As shown in FIG. 1, the compressor system 1 causes the compressor 3 to operate at high speed by one drive machine 2. The compressor system 1 is used, for example, in a plant that generates a gas containing ethylene such as a petrochemical plant. The compressor system 1 can clean the inside of the compressor 3 by supplying oil, which is cleaning oil, and water (cooling water), which is cleaning water, into the inside of the compressor 3 during operation. The compressor system 1 of the present embodiment includes a drive machine 2, a compressor 3, a water supply unit 4, an oil supply unit 5, a compressor information acquisition unit 6, an oil information acquisition unit 7, a cooling water information acquisition unit 8, and a supply control unit 9.

[0013] The drive unit 2 is rotationally driven to generate power for driving the compressor 3. The drive unit 2 has a drive shaft 21 that rotates about the axis O. The drive unit 2 of the present embodiment is a variable speed motor that drives the drive shaft 21 at a constant speed. Note that the drive unit 2 only needs to be able to generate power for driving the compressor 3, and a steam turbine or the like can be adopted in addition to the motor.

[0014] The compressor 3 uses the supplied gas as a working fluid. The compressor 3 of the present embodiment is a cracked gas compressor that compresses a hydrocarbon gas containing organic chemical substances such as ethylene and propylene generated by decomposing hydrocarbons as a working fluid. The compressor 3 of the present embodiment is a single-shaft multi-stage centrifugal compressor that compresses the working fluid using a plurality (for example, three) of impellers (not shown) arranged inside a casing (not shown). The compressor 3 has a rotating shaft 31 that rotates about the axis O. In the compressor 3, the working fluid is supplied from a supply line 32 connected to an inlet (not shown) for suction. In the compressor 3, the compressed fluid is sent out to a discharge line 33 connected to an outlet (not shown) for discharge. The sent-out compressed fluid is supplied to other devices outside the compressor 3. Further, in the compressor 3, as the inside of the compressor 3 becomes hot during continuous operation, the hydrocarbon gas polymerizes, and a polymer called fouling adheres to the wall surface forming the flow path (the flow path of the casing and the flow path of the impeller) through which the hydrocarbon gas flows inside the compressor 3.

[0015] The water supply unit 4 supplies cooling water to the internal flow path of the compressor 3 during operation. The water supply unit 4 supplies water to the middle of the flow path of the compressor 3 (for example, the flow path of the casing connected to the outlet of the impeller), thereby lowering the temperature inside the compressor 3. Thereby, in the compressor 3, the generation of fouling during operation is suppressed. That is, the water supply unit 4 constitutes a water injection system. The water supply unit 4 of the present embodiment has a cooling water supply source 41, a cooling water supply line 42, and a cooling water supply regulating valve 43.

[0016] The cooling water supply source 41 is a device that pumps and supplies water using a pump or the like. The cooling water supply source 41 is, for example, a tank in which water is stored, or a device that circulates and supplies water used for various coolings of the compressor 3. The cooling water supply line 42 connects the cooling water supply source 41 and the compressor 3. The cooling water supply line 42 of the present embodiment branches into a plurality (three in the present embodiment) on the downstream side close to the compressor 3. Thereby, the water flowing through the cooling water supply line 42 is supplied to each stage of the compressor 3 (the position where each impeller is arranged). The cooling water supply control valve 43 is arranged on the cooling water supply line 42. The cooling water supply control valve 43 is a valve capable of adjusting the flow rate of the water flowing in the cooling water supply line 42. The cooling water supply control valve 43 in the present embodiment is an on-off valve that can be switched between a fully open state that allows the water flowing through the cooling water supply line 42 to flow toward the compressor 3 and a fully closed state that prevents the flow.

[0017] In addition, in the present embodiment, only one cooling water supply control valve 43 is arranged, but the present invention is not limited to such a configuration. A plurality of cooling water supply control valves 43 may be arranged on the cooling water supply line 42. Therefore, the cooling water supply control valve 43 may be arranged at each of the downstream portions of the branched cooling water supply lines 42 to adjust the supply amount of the water supplied to each stage of the compressor 3. Further, the cooling water supply control valve 43 is not limited to being an on-off valve, and may be a flow rate control valve capable of adjusting the flow rate or a pressure control valve capable of adjusting the supply pressure. Also, the cooling water supply line 42 is not limited to having only the cooling water supply control valve 43 arranged thereon, and other valves may be arranged. For example, a shut-off valve for stopping the supply of water to the compressor 3 in an emergency may be arranged on the cooling water supply line 42.

[0018] The oil supply unit 5 supplies cleaning oil to the internal flow path of the compressor 3 during operation when water is being supplied. As the cleaning oil, an oil with low volatility, high density that easily dissolves polymers, and a large amount of aroma components (aromatic components) is preferred. Such oil is known to be very expensive. Specifically, it is preferable to apply a C9+ aromatic fraction which is hydrogenated gasoline or naphtha cracked oil as the oil. The oil supply unit 5 supplies oil to the middle of the flow path of the compressor 3 (for example, the flow path of the casing connected to the outlet of the impeller), thereby peeling off and flushing away the fouling adhering to the inside of the compressor 3. As a result, in the compressor 3, while operating, the fouling adhering to the inside of the compressor 3 is removed. That is, the oil supply unit 5 constitutes an oil injection system. The oil supply unit 5 of the present embodiment includes an oil supply source 51, an oil supply line 52, and an oil supply regulating valve 53.

[0019] The oil supply source 51 is a device that pumps and supplies oil, such as a pump. The oil supply source 51 is, for example, a tank in which oil is stored, or a device that supplies oil generated by another device outside the compressor 3. The oil supply line 52 connects the oil supply source 51 and the compressor 3. The oil supply line 52 of the present embodiment branches into a plurality (three in the present embodiment) on the downstream side close to the compressor 3. The oil supply line 52 is arranged in parallel with the cooling water supply line 42. That is, the oil supply line 52 is connected to the compressor 3 at a position very close to the position where the cooling water supply line 42 is connected. As a result, the oil flowing through the oil supply line 52 is supplied to each stage (the position where each impeller is arranged) of the compressor 3 at a position close to the position where water is supplied. The oil supply regulating valve 53 is arranged on the oil supply line 52. The oil supply regulating valve 53 is a valve capable of adjusting the flow rate of the oil flowing in the oil supply line 52. The oil supply regulating valve 53 in the present embodiment is an on-off valve that can be switched between a fully open state that allows the oil flowing through the oil supply line 52 to flow toward the compressor 3 and a fully closed state that prevents the flow.

[0020] Note that in this embodiment, only one oil supply adjustment valve 53 is arranged, but the present invention is not limited to such a configuration. A plurality of oil supply adjustment valves 53 may be arranged on the oil supply line 52. Therefore, the oil supply adjustment valves 53 may be arranged at the downstream portions of the branched oil supply lines 52 respectively to adjust the supply amount of the oil supplied to each stage of the compressor 3. Further, the oil supply adjustment valve 53 is not limited to being an on-off valve, and may be a flow rate adjustment valve capable of adjusting the flow rate or a pressure adjustment valve capable of adjusting the supply pressure. Further, the oil supply line 52 is not limited to having only the oil supply adjustment valve 53 arranged thereon, and other valves may be arranged. For example, a shut-off valve for stopping the supply of oil to the compressor 3 in an emergency may be arranged on the oil supply line 52.

[0021] The compressor information acquisition unit 6 acquires information on the operating status of the compressor 3. Here, the information on the operating status of the compressor 3 is, for example, the flow rate, temperature, and pressure of the compressed fluid compressed by the compressor 3. The compressor information acquisition unit 6 of the present embodiment is arranged on the discharge line 33 and the supply line 32. The compressor information acquisition unit 6 has a plurality of sensors (not shown) capable of measuring the flow rate, temperature, and pressure. That is, the compressor information acquisition unit 6 acquires in real time the information on the operating status of the operating compressor 3. The compressor information acquisition unit 6 sends the acquired information on the flow rate, temperature, and pressure of the compressed fluid as the information on the operating status of the compressor 3 to the supply control unit 9.

[0022] The oil information acquisition unit 7 acquires information on the supply status of the oil supplied from the oil supply unit 5 to the compressor 3. Here, the information on the supply status of the oil is, for example, the flow rate, temperature, and pressure of the oil supplied to the compressor 3. The oil information acquisition unit 7 of the present embodiment is arranged on the oil supply line 52. The oil information acquisition unit 7 has a plurality of sensors (not shown) capable of measuring the flow rate, temperature, and pressure. The oil information acquisition unit 7 sends the acquired information on the flow rate, temperature, and pressure of the oil as the information on the supply status of the oil to the supply control unit 9.

[0023] The cooling water information acquisition unit 8 acquires information on the supply status of the water supplied from the water supply unit 4 to the compressor 3. Here, the information on the supply status of the water is, for example, the flow rate, temperature, and pressure of the water supplied to the compressor 3. The cooling water information acquisition unit 8 of the present embodiment is arranged on the cooling water supply line 42. The cooling water information acquisition unit 8 has a plurality of sensors (not shown) capable of measuring the flow rate, temperature, and pressure. The cooling water information acquisition unit 8 sends the acquired information on the flow rate, temperature, and pressure of the water to the supply control unit 9 as information on the supply status.

[0024] (Configuration of the supply control unit) The supply control unit 9 controls the supply state of water to the compressor 3 in the water supply unit 4 and the supply state of oil to the compressor 3 in the oil supply unit 5. The supply control unit 9 controls the water supply unit 4 and the oil supply unit 5 according to the operating status of the compressor 3. The supply control unit 9 also controls the compressor 3. The supply control unit 9 of the present embodiment has an injection system control unit 901, a compressor operation data monitoring unit 902, and a remote monitoring unit 903.

[0025] The injection system control unit 901 controls the water supply unit 4 and the oil supply unit 5. Specifically, the injection system control unit 901 can adjust the opening degree of the cooling water supply adjustment valve 43 according to the supply status of the water flowing through the cooling water supply line 42. Further, the injection system control unit 901 can adjust the opening degree of the oil supply adjustment valve 53 according to the supply status of the oil flowing through the oil supply line 52. The injection system control unit 901 sends the acquired information on the supply status of the water and the supply status of the oil to the remote monitoring unit 903.

[0026] The compressor operation data monitoring unit 902 controls the compressor 3. Specifically, the compressor operation data monitoring unit 902 controls the compressor 3 according to the operating status while acquiring the operating status of the compressor 3. The compressor operation data monitoring unit 902 sends the acquired information on the operating status of the compressor 3 to the injection system control unit 901 and the remote monitoring unit 903.

[0027] The remote monitoring unit 903 can monitor the injection system control unit 901 and the compressor operation data monitoring unit 902 from a remote location away from the drive machine 2, the compressor 3, the water supply unit 4, and the oil supply unit 5. Specifically, the remote monitoring unit 903 can obtain information such as the water supply status information and the oil supply status information sent from the injection system control unit 901, and the operation status information of the compressor 3 input from the compressor operation data monitoring unit 902, for example, by displaying them. Further, the remote monitoring unit 903 can control the water supply unit 4, the oil supply unit 5, and the compressor 3 by sending instructions to the injection system control unit 901 and the compressor operation data monitoring unit 902.

[0028] Also, the injection system control unit 901, the compressor operation data monitoring unit 902, and the remote monitoring unit 903 each include a computer 950. As shown in FIG. 2, the computer 950 has a processor 951, a main memory 952, a storage 953, and an interface 954.

[0029] The operations of the respective processing units in the injection system control unit 901, the compressor operation data monitoring unit 902, and the remote monitoring unit 903 are stored in the storage 953 in the form of a program. The processor 951 reads the program from the storage 953, expands it in the main memory 952, and executes the above processing according to the program. Further, the processor 951 secures a storage area corresponding to each of the above storage units in the main memory 952 according to the program.

[0030] The program may be for realizing a part of the functions to be exhibited by the computer 950. For example, the program may exhibit functions in combination with other programs already stored in the storage 953, or in combination with other programs installed in other devices.

[0031] In addition to or instead of the above configuration, the computer 950 may include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device). Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions realized by the processor 951 may be realized by the integrated circuit.

[0032] Examples of the storage 953 include a magnetic disk, a magneto-optical disk, a semiconductor memory, and the like. The storage 953 may be an internal medium directly connected to the bus of the computer 950, or an external medium connected to the computer 950 via the interface 954 or a communication line.

[0033] Also, when the program is distributed to the computer 950 via a communication line, the receiving computer 950 may expand the program in the main memory 952 and execute the above processing. In the above embodiment, the storage 953 is a non-transitory tangible storage medium.

[0034] Also, the program may be for realizing a part of the above-described functions. Further, the program may be a so-called difference file (difference program) that realizes the above-described functions in combination with other programs already stored in the storage 953.

[0035] As shown in FIG. 3, the supply control unit 9 of this embodiment includes, as processing units, a cleaning instruction unit 91, a provisional cleaning instruction unit 92, a change rate acquisition unit 93, a supply amount acquisition unit 94, an operation cost acquisition unit 95, an oil cost acquisition unit 96, a cost relationship acquisition unit 97, a determination unit 98, a cleaning condition setting unit 99, a display unit 100, and a remote operation unit 101. The cleaning instruction unit 91, the provisional cleaning instruction unit 92, the change rate acquisition unit 93, the supply amount acquisition unit 94, the operation cost acquisition unit 95, the oil cost acquisition unit 96, the cost relationship acquisition unit 97, the determination unit 98, the cleaning condition setting unit 99, the display unit 100, and the remote operation unit 101 are executed by a computer 950 of an injection system control unit 901, a compressor operation data monitoring unit 902, and a remote monitoring unit 903.

[0036] The cleaning instruction unit 91 sends an instruction to the water supply unit 4 to supply water to the compressor 3 and sends an instruction to the oil supply unit 5 to supply oil to the compressor 3. Specifically, the cleaning instruction unit 91 sends an instruction to the water supply unit 4 to continuously perform cleaning on the operating compressor 3. That is, the cleaning instruction unit 91 sends an instruction to change the opening degree of the cooling water supply adjustment valve 43 so as to continuously supply water to the compressor 3. In this embodiment, the cleaning instruction unit 91 sends an instruction to maintain the cooling water supply adjustment valve 43 in an open state with a constant opening degree at all times during the operation of the compressor 3. As a result, the water supply unit 4 continuously supplies a constant amount of water to the operating compressor 3.

[0037] Further, the cleaning instruction unit 91 sends an instruction to the oil supply unit 5 to perform cleaning under the cleaning conditions having the set cleaning time Tt and cleaning cycle Tc. That is, the cleaning instruction unit 91 sends an instruction to change the opening degree of the oil supply adjustment valve 53 so as to supply oil to the compressor 3 based on the cleaning conditions. In the present embodiment, as shown in FIG. 4, during the operation of the compressor 3, the cleaning instruction unit 91 sends an instruction to the oil supply adjustment valve 53 to periodically repeat the opened state and the closed state at the specified cleaning time Tt and cleaning cycle Tc. As a result, the oil supply unit 5 intermittently supplies a certain amount of oil to the operating compressor 3. At that time, the cleaning instruction unit 91 sends an instruction to the oil supply adjustment valve 53 to maintain the opened state for a predetermined time. The predetermined time for maintaining the opened state with respect to the oil supply adjustment valve 53 is the cleaning time Tt. That is, during the cleaning time Tt, the compressor 3 is in an operating state and oil is being supplied to the compressor 3. Further, after the cleaning instruction unit 91 sends an instruction to the oil supply adjustment valve 53 to maintain the opened state for the cleaning time Tt, it sends an instruction to maintain the closed state for a predetermined time. The predetermined time for maintaining the closed state with respect to the oil supply adjustment valve 53 is the cleaning cycle Tc. That is, during the cleaning cycle Tc, even though the compressor 3 is in operation, no oil is supplied to the compressor 3.

[0038] As shown in FIG. 3, the provisional cleaning instruction unit 92 sends an instruction to the oil supply unit 5 to supply oil to the compressor 3 under a plurality of provisional cleaning conditions having different predetermined cleaning times Tt and cleaning periods Tc. The provisional cleaning instruction unit 92 sends an instruction to change the opening degree of the oil supply adjustment valve 53 at a stage before the cleaning instruction unit 91 sends an instruction to the oil supply adjustment valve 53. That is, the provisional cleaning instruction unit 92 sends an instruction regarding the conditions for supplying oil to the compressor 3 to the oil supply unit 5 at a stage before the oil supply unit 5 regularly supplies oil to the compressor 3. The plurality of provisional cleaning conditions are determined in advance before starting the operation of the compressor 3. In each provisional cleaning condition, the cleaning time Tt and the cleaning period Tc are determined to be a plurality of different combinations. For example, in the present embodiment, as shown in FIG. 5, by combining the first cleaning time Tt1 and the second cleaning time Tt2, and the first cleaning period Tc1 and the second cleaning period Tc2, an instruction is sent to the oil supply adjustment valve 53 to change the opening degree under four provisional cleaning conditions. The first cleaning time Tt1 is, for example, 30 minutes. The second cleaning time Tt2 is, for example, 60 minutes which is twice the first cleaning time Tt1. Also, the first cleaning period Tc1 is, for example, one week. The second cleaning period Tc2 is two weeks which is twice the first cleaning period Tc1. Therefore, the first provisional cleaning condition has the first cleaning time Tt1 and the first cleaning period Tc1. The second provisional cleaning condition has the second cleaning time Tt2 and the first cleaning period Tc1. The third provisional cleaning condition has the first cleaning time Tt1 and the second cleaning period Tc2. The fourth provisional cleaning condition has the second cleaning time Tt2 and the second cleaning period Tc2.

[0039] Note that the combination of the cleaning time Tt and the cleaning period Tc under the provisional cleaning conditions is not limited to the four described above. The provisional cleaning conditions may be appropriately set according to the compressor 3, and may be four or more conditions, or may be four or less conditions.

[0040] Further, as shown in FIG. 3, the provisional cleaning instruction unit 92 of the present embodiment is configured to be capable of receiving information on new provisional cleaning conditions from the determination unit 98, which will be described later. When new provisional cleaning conditions are input from the determination unit 98, an instruction is sent to the oil supply unit 5 (oil supply adjustment valve 53) to supply oil to the compressor 3 under the new provisional cleaning conditions.

[0041] The change rate acquisition unit 93 acquires the change rate of the efficiency of the compressor 3 from the information on the operating status of the compressor 3. In the change rate acquisition unit 93 of the present embodiment, information on the operating status of the compressor 3 during operation is input from the compressor information acquisition unit 6. The change rate acquisition unit 93 calculates and acquires the efficiency of the compressor 3 during operation based on the acquired information on the operating status of the compressor 3. The change rate acquisition unit 93 calculates and acquires the change rate from the acquired information on the efficiency of the compressor 3. The change rate of the efficiency is, for example, the slope of the efficiency indicated by the dotted line in FIGS. 4 and 5.

[0042] Note that the efficiency of the compressor 3 during operation decreases as the fouling increases due to the long operation time of the compressor 3, and increases as the fouling decreases due to the supply of oil (see the dotted lines in FIGS. 4 and 5). That is, the efficiency of the compressor 3 serves as an index indicating the amount of fouling removed by the oil.

[0043] As shown in FIG. 3, the supply amount acquisition unit 94 acquires the supply amount of oil and the supply amount of cooling water. Information on the supply status of oil is input to the supply amount acquisition unit 94 from the oil information acquisition unit 7. The supply amount acquisition unit 94 calculates and acquires the supply amount of oil supplied to the compressor 3 based on the information on the supply status of oil acquired by the oil information acquisition unit 7. The supply amount of oil is, for example, the amount of oil at the cleaning time Tt. Further, information on the supply status of water is input to the supply amount acquisition unit 94 from the cooling water information acquisition unit 8. The supply amount acquisition unit 94 calculates and acquires the supply amount of cooling water supplied to the compressor 3 based on the information on the supply status of water acquired by the cooling water information acquisition unit 8.

[0044] The operation cost acquisition unit 95 acquires the operation cost of the compressor 3 during operation. Information on the change rate acquired by the change rate acquisition unit 93 is input to the operation cost acquisition unit 95. The operation cost acquisition unit 95 calculates and acquires the operation cost at the cleaning time Tt and the cleaning cycle Tc from the input change rate. The operation cost is the power cost when operating the compressor 3, which decreases as the efficiency increases and increases as the efficiency decreases. Also, information on the operation status of the compressor 3 is input to the operation cost acquisition unit 95 from the change rate acquisition unit 93.

[0045] The oil cost acquisition unit 96 acquires the oil cost of the oil supplied to the compressor 3. Information on the supply amount of the oil acquired by the supply amount acquisition unit 94 is input to the oil cost acquisition unit 96. The oil cost acquisition unit 96 calculates and acquires the oil cost at the cleaning time Tt from the input supply amount of the oil. The oil cost is calculated based on, for example, the supply amount of the oil and the unit price of the oil being used. In this embodiment, the oil cost during the cleaning time Tt when the oil is supplied is acquired. Also, information on the supply amount of the oil and the supply amount of the cooling water is input to the oil cost acquisition unit 96 from the supply amount acquisition unit 94.

[0046] The cost relationship acquisition unit 97 acquires a provisional relationship value that is the relationship between the operation cost and the oil cost from the operation cost acquired by the operation cost acquisition unit 95 and the oil cost acquired by the oil cost acquisition unit 96. The provisional relationship value is acquired for each of a plurality of provisional cleaning conditions. The provisional relationship value that is the relationship between the operation cost and the oil cost is, for example, a value representing a correlation relationship such as the change rate of the operation cost accompanying the change in the oil cost or the combined value of the operation cost and the oil cost. In this embodiment, the cost relationship acquisition unit 97 calculates the combined value of the operation cost and the oil cost as the provisional relationship value. Also, information on the operation status of the compressor 3 and information on the efficiency are input to the cost relationship acquisition unit 97 from the operation cost acquisition unit 95. Further, information on the supply amount of the oil and the supply amount of the cooling water is input to the cost relationship acquisition unit 97 from the oil cost acquisition unit 96.

[0047] The determination unit 98 determines whether there is a cleaning condition suitable for operating the compressor 3 among a plurality of provisional cleaning conditions. Information on a plurality of provisional relationship values acquired by the cost relationship acquisition unit 97 is input to the determination unit 98. The determination unit 98 determines whether any one of the plurality of input provisional relationship values satisfies a predetermined optimal reference value when operating the compressor 3. The optimal reference value is a predetermined value estimated to be the most suitable cleaning time Tt and cleaning cycle Tc when operating the compressor 3. The optimal reference value is at least one upper limit value of the allowable operating cost and oil cost when operating the compressor 3. Specifically, examples of the optimal reference value include the upper limit allowable value of the change rate of the operating cost accompanying the change in the oil cost under a plurality of cleaning conditions, the upper limit allowable value of the total value of the operating cost and the oil cost, the upper limit allowable value of the operating cost, and the upper limit allowable value of the oil cost. In the determination unit 98 of the present embodiment, the upper limit allowable value of the total value of the operating cost and the oil cost is used as the optimal reference value.

[0048] When the determination unit 98 determines that any one of the plurality of provisional relationship values satisfies the optimal reference value, it determines that the provisional relationship value is a cleaning condition suitable for operating the compressor 3. That is, when any one of the provisional relationship values satisfies the optimal reference value, the determination unit 98 sends information on the provisional relationship value that satisfies the optimal reference value to the cleaning condition setting unit 99.

[0049] When the determination unit 98 determines that all of the provisional relationship values do not satisfy the optimal reference value, it sends an instruction to the provisional cleaning instruction unit 92 to set new provisional cleaning conditions. The new provisional cleaning conditions are cleaning conditions having a cleaning time Tt and a cleaning cycle Tc different from the plurality of provisional cleaning conditions.

[0050] Upon receiving the instruction, the provisional cleaning instruction unit 92 sends an instruction to the oil supply adjustment valve 53 to supply oil under the new provisional cleaning conditions. Subsequently, the change rate acquisition unit 93 acquires the change rate of the efficiency under the new provisional cleaning conditions. Then, the operating cost acquisition unit 95 acquires the operating cost under the new provisional cleaning conditions. Furthermore, the supply amount acquisition unit 94 acquires the oil supply amount under the new provisional cleaning conditions. The oil cost acquisition unit 96 acquires the oil cost under the new provisional cleaning conditions. As a result, the cost relationship acquisition unit 97 acquires the re-acquisition relationship value, which is the relationship between the operating cost and the oil cost under the new provisional cleaning conditions. The re-acquisition relationship value is information of the same type as the provisional relationship value.

[0051] After that, the determination unit 98 determines whether the re-acquisition relationship value input from the cost relationship acquisition unit 97 satisfies the optimal reference value. When the determination unit 98 determines that the re-acquisition relationship value satisfies the optimal reference value, it determines that the re-acquisition relationship value is the cleaning condition suitable for operating the compressor 3. That is, the determination unit 98 sends the information of the re-acquisition relationship value to the cleaning condition setting unit 99.

[0052] The cleaning condition setting unit 99 acquires the regular cleaning conditions based on the cleaning time Tt and the cleaning cycle Tc of the provisional relationship value sent from the determination unit 98. The regular cleaning conditions are the conditions when the oil supply unit 5 supplies oil to the compressor 3 regularly. Also, when the re-acquisition relationship value satisfies the optimal reference value in the determination unit 98, the cleaning condition setting unit 99 acquires the regular cleaning conditions based on the re-acquisition relationship value. The cleaning condition setting unit 99 may acquire the values of the cleaning time Tt and the cleaning cycle Tc of the provisional relationship value or the re-acquisition relationship value itself as the regular cleaning conditions, or may acquire the new cleaning time Tt and the cleaning cycle Tc calculated based on the cleaning time Tt and the cleaning cycle Tc of the provisional relationship value or the re-acquisition relationship value. When calculating the regular cleaning conditions based on the cleaning time Tt and the cleaning cycle Tc of the provisional relationship value or the re-acquisition relationship value, information on the operating status of the compressor 3, information on the oil supply status, information on the water supply status, information on the oil cost, information on the operating cost, etc. may be input and used as values corrected based on these input values.

[0053] The cleaning condition setting unit 99 sends an instruction to the cleaning instruction unit 91 to set the acquired regular cleaning conditions. Further, the cleaning condition setting unit 99 sends the information on the acquired regular cleaning conditions to the display unit 100. The cleaning instruction unit 91 that has received the instruction sends an instruction to the oil supply unit 5 to supply oil under the regular cleaning conditions. As a result, the oil supply unit 5 continues to supply oil to the compressor 3 regularly under the regular cleaning conditions until new cleaning conditions are set.

[0054] The display unit 100 displays the provisional relationship value acquired by the cost relationship acquisition unit 97. The display unit 100 of the present embodiment is, for example, a monitor through which an operator can visually recognize the cleaning time Tt and the cleaning cycle Tc. The display unit 100 is arranged, for example, in the remote monitoring unit 903. Note that the display unit 100 also displays the regular cleaning conditions when the information on the regular cleaning conditions is sent from the cleaning condition setting unit 99. Further, the display unit 100 can also display information on the operating status of the compressor 3, the oil supply amount, and the cooling water supply amount input from the cost relationship acquisition unit 97.

[0055] The remote operation unit 101 can change the cleaning time Tt and the cleaning cycle Tc by sending an instruction to the cleaning instruction unit 91 from a remote location. The remote operation unit 101 of the present embodiment is, for example, an interface 954 that can be operated by an operator. The remote operation unit 101 is arranged, for example, in the remote monitoring unit 903. Note that the remote operation unit 101 can also change the provisional cleaning conditions by sending an instruction to the provisional cleaning instruction unit 92 from a remote location.

[0056] Next, the process of performing water injection and oil injection on the compressor 3 during operation will be described. In the compressor system 1, as the compressor 3 operates, the water supply unit 4 receives an instruction from the cleaning instruction unit 91 to supply water to the compressor 3. As a result, the cooling water supply adjustment valve 43 reaches a predetermined constant opening degree, and the water from the cooling water supply source 41 passes through the cooling water supply line 42 and is supplied to each stage of the compressor 3. Thereby, water flows through the internal flow path of the compressor 3 during operation. In this way, continuous water injection is performed on the compressor 3 during operation. As a result, the inside of the compressor 3 is cooled, and the polymerization of the hydrocarbon gas flowing through the flow path is suppressed. Thereby, the adhesion of fouling to the wall surface of the flow path is suppressed.

[0057] Also, information on the supply status of the water supplied to the compressor 3 through the cooling water supply line 42 is acquired by the cooling water information acquisition unit 8. The acquired information on the supply status of the water is sent to the supply amount acquisition unit 94 and is used for the supply of water.

[0058] In the compressor system 1, after the compressor 3 has been operating for a certain period from the start of operation, the oil supply unit 5 receives an instruction from the provisional cleaning instruction unit 92 to supply oil to the compressor 3. The provisional cleaning instruction unit 92 sends a plurality of predetermined provisional cleaning conditions to the oil supply unit 5. As a result, the oil supply adjustment valve 53 reaches a predetermined constant opening degree, and the oil from the oil supply source 51 passes through the oil supply line 52 and is supplied to each stage of the compressor 3. In this way, intermittent oil injection is performed on the compressor 3 during operation. Thereby, oil flows through the internal flow path of the compressor 3 during operation. Furthermore, since a plurality of provisional cleaning conditions are sent to the oil supply unit 5, before receiving an instruction from the cleaning instruction unit 91, as shown in FIG. 5, the supply of oil under a plurality of provisional cleaning conditions is completed.

[0059] In addition, information on the supply status of the oil supplied to the compressor 3 through the oil supply line 52 is acquired by the oil information acquisition unit 7. The acquired information on the supply status of the oil is sent to the supply amount acquisition unit 94. As a result, the supply amount acquisition unit 94 calculates and acquires the supply amount of the oil supplied to the compressor 3 under each provisional cleaning condition (only the cleaning time Tt). The supply amount acquisition unit 94 sends the information on the supply amount of the oil under each acquired provisional cleaning condition to the oil cost acquisition unit 96.

[0060] In the oil cost acquisition unit 96, the oil cost of the oil supplied to the cleaning time Tt is calculated and acquired from the acquired information on the supply amount of the oil based on the unit price of the oil. That is, the oil cost under each provisional cleaning condition (only the cleaning time Tt) is acquired. The oil cost acquisition unit 96 sends the acquired information on the oil cost, and the information on the supply amount of the oil and the supply amount of the cooling water to the cost relationship acquisition unit 97.

[0061] In addition, in the compressor system 1, information on the operating status of the operating compressor 3 is acquired by the compressor information acquisition unit 6. The compressor information acquisition unit 6 acquires information on the efficiency during the entire operating period of the compressor 3 including the cleaning time Tt and the cleaning cycle Tc. The acquired information on the operating status of the compressor 3 is sent to the change rate acquisition unit 93. As a result, the change rate acquisition unit 93 calculates and acquires the change rate of the efficiency of the operating compressor 3. That is, the change rate acquisition unit 93 acquires the change rate of the efficiency during the entire operating period of the compressor 3 including the cleaning time Tt and the cleaning cycle Tc. The change rate acquisition unit 93 sends the acquired information on the change rate of the efficiency and the information on the operating status of the compressor 3 to the operating cost acquisition unit 95.

[0062] In the operating cost acquisition unit 95, the operating costs at the cleaning time Tt and the cleaning cycle Tc are calculated and acquired from the acquired information on the change rate of the efficiency of the compressor 3. That is, the operating costs under each provisional cleaning condition (both the cleaning time Tt and the cleaning cycle Tc) are acquired. The operating cost acquisition unit 95 sends the acquired information on the operating cost, the information on the operating status of the compressor 3, and the information on the efficiency to the cost relationship acquisition unit 97.

[0063] In the cost relationship acquisition unit 97, a provisional relationship value representing the relationship between the driving cost and the oil cost is acquired from the driving cost information sent from the driving cost acquisition unit 95 and the oil cost information sent from the oil cost acquisition unit 96. In the present embodiment, for example, the cost relationship acquisition unit 97 acquires, as the provisional relationship value, the sum value of the driving cost and the oil cost for each of a plurality of provisional cleaning conditions. The cost relationship acquisition unit 97 sends the information on the acquired provisional relationship value to the determination unit 98. Further, the cost relationship acquisition unit 97 sends the information on the acquired provisional relationship value, the information on the oil cost, the information on the supply amounts of the oil and the cooling water, the information on the driving cost, the information on the operating status of the compressor 3, and the information on the efficiency to the display unit 100.

[0064] In the determination unit 98, it is determined whether any of the plurality of provisional relationship values satisfies the optimal reference value based on the input information on the provisional relationship values. Specifically, in the determination unit 98, it is determined whether the sum value of the driving cost and the oil cost corresponding to the provisional relationship value exceeds the upper limit allowable value. When the determination unit 98 determines that any one of the plurality of provisional relationship values satisfies the optimal reference value, the information on that provisional relationship value is sent to the cleaning condition setting unit 99.

[0065] When the determination unit 98 determines that all of the plurality of provisional relationship values do not satisfy the optimal reference value, an instruction is sent to the provisional cleaning instruction unit 92 to set new provisional cleaning conditions. The instructed provisional cleaning instruction unit 92 calculates and acquires new provisional cleaning conditions based on the plurality of provisional cleaning conditions. The provisional cleaning instruction unit 92 sends an instruction to the oil supply adjustment valve 53 to supply oil under the acquired new provisional cleaning conditions. Thereafter, similar to the case where oil is supplied under the provisional cleaning conditions, the driving cost and the oil cost are acquired. As a result, the cost relationship acquisition unit 97 acquires a re-acquired relationship value representing the relationship between the driving cost and the oil cost under the new provisional cleaning conditions. Thereafter, the determination unit 98 performs the determination again. Specifically, it is determined whether the re-acquired relationship value satisfies the optimal reference value. When the determination unit 98 determines that the re-acquired relationship value satisfies the optimal reference value, the information on the re-acquired relationship value is sent to the cleaning condition setting unit 99.

[0066] In the cleaning condition setting unit 99, the regular cleaning conditions are acquired based on the cleaning time Tt and the cleaning cycle Tc of the provisional relationship value or the re-acquired relationship value sent from the determination unit 98. The cleaning condition setting unit 99 sends an instruction to set the acquired regular cleaning conditions to the cleaning instruction unit 91. In the cleaning instruction unit 91 that receives the instruction, the regular cleaning conditions are set. As a result, after the oil is supplied under the provisional cleaning conditions, the oil supply adjustment valve 53 opens under the regular cleaning conditions, and the oil is regularly supplied to the compressor 3. As a result, oil injection is performed on the compressor 3 under the regular cleaning conditions.

[0067] (Function and effect) In the compressor system 1 with the above configuration, the cost relationship acquisition unit 97 acquires a provisional relationship value that is the relationship between the operation cost and the oil cost under each of a plurality of provisional cleaning conditions having different predetermined cleaning times Tt and cleaning cycles Tc. As a result, the relationship between the operation cost and the oil cost under a plurality of conditions where the cleaning time Tt for supplying oil and the cleaning cycle Tc, which is the interval until the next oil supply, are changed can be grasped. Therefore, it is possible to grasp how the relationship between the operation cost and the oil cost changes due to the changes in the cleaning time Tt and the cleaning cycle Tc. Thereby, the optimal cleaning time Tt and the cleaning cycle Tc for making the operation cost and the oil cost during the cleaning of the compressor 3 with oil into the required optimal conditions can be easily acquired.

[0068] Further, when the determination unit 98 determines that any one of the plurality of provisional relationship values satisfies the optimal reference value, the information of the provisional relationship value is set to the cleaning instruction unit 91 via the cleaning condition setting unit 99. Thereby, the optimal cleaning time Tt and the cleaning cycle Tc during the cleaning of the compressor 3 with oil can be automatically instructed to the oil supply unit 5. Therefore, oil injection can be automatically performed at the optimal cleaning time Tt and the cleaning cycle Tc without the intervention of an operator.

[0069] Furthermore, even when not all of the plurality of provisional relationship values satisfy the optimal reference value, the provisional cleaning instruction unit 92 is sent by the determination unit 98 to set a new provisional cleaning condition having a cleaning time Tt and a cleaning cycle Tc different from the plurality of provisional relationship values. Therefore, even when there is no optimal cleaning time Tt and cleaning cycle Tc among the plurality of previously set provisional cleaning conditions, it is possible to automatically search for and obtain them at the optimal cleaning time Tt and cleaning cycle Tc. As a result, the optimal cleaning time Tt and cleaning cycle Tc during cleaning in the compressor 3 with oil can be easily obtained with high accuracy.

[0070] Furthermore, the provisional relationship values acquired by the cost relationship acquisition unit 97 are displayed on the display unit 100. Further, in the present embodiment, the regular cleaning conditions, information on the operating status of the compressor 3, information on the oil supply amount, and information on the cooling water supply amount can be displayed on the display unit 100. Therefore, these pieces of information can be easily grasped by the operator, and their validity can be confirmed.

[0071] Also, the cleaning time Tt and the cleaning cycle Tc can be changed from a remote location to the cleaning instruction unit 91 by the remote operation unit 101. Further, the remote operation unit 101 of the present embodiment can also change the provisional cleaning condition from a remote location to the provisional cleaning instruction unit 92. Therefore, the timing of supplying oil by the oil supply unit 5 can be easily adjusted from a position away from the oil supply unit 5 and the cleaning instruction unit 91.

[0072] Also, the optimal reference value used as the criterion for determination by the determination unit 98 is set to at least an upper limit value of the allowable operation cost and oil cost when operating the compressor 3. In the present embodiment, as the optimal reference value, an upper limit allowable value of the combined value of the operation cost and the oil cost is set. Therefore, the combined cost of the operation cost and the oil cost during cleaning in the compressor 3 with oil can be kept within an allowable range as the compressor system 1.

[0073] Further, the rate-of-change acquisition unit 93 acquires the rate of change of efficiency based on the operation information of the compressor 3 of the operation acquired by the compressor information acquisition unit 6. Therefore, information for accurately grasping the state of the actually operating compressor 3 can be acquired. As a result, the operation cost during cleaning inside the compressor 3 with oil can be acquired with high accuracy.

[0074] <Second Embodiment> Next, a second embodiment of the compressor system according to the present disclosure will be described. In the second embodiment described below, components common to the first embodiment are denoted by the same reference numerals in the drawings and the description thereof is omitted.

[0075] (Configuration of Supply Control Unit) As shown in FIG. 6, in the compressor system 1A of the second embodiment, the configuration of the supply control unit 9A is different. The supply control unit 9A of the second embodiment further includes an elapsed rate-of-change acquisition unit 105, a rate-of-change determination unit 106, and an additional cleaning instruction unit 107.

[0076] The elapsed rate-of-change acquisition unit 105 acquires the elapsed rate of change based on the information on the operation status of the compressor 3. Information on the operation status of the compressor 3 during operation at the cleaning cycle Tc is input from the compressor information acquisition unit 6 to the elapsed rate-of-change acquisition unit 105 of the present embodiment. The elapsed rate-of-change acquisition unit 105 calculates and acquires the elapsed rate of change of the compressor 3 during operation based on the information on the operation status of the compressor 3 acquired by the compressor information acquisition unit 6. The elapsed rate of change is the rate of change of the efficiency of the compressor 3 per predetermined time in a situation where oil is not supplied.

[0077] The rate-of-change determination unit 106 determines whether or not the elapsed rate of change exceeds a predetermined reference rate of change. Information on the elapsed rate of change obtained by the elapsed rate-of-change acquisition unit 105 is input to the rate-of-change determination unit 106. The reference rate of change is a rate of change in efficiency per unit time that is predetermined based on the allowable amount of fouling generated when operating the compressor 3. Specifically, the reference rate of change is the upper limit value of the rate of change in efficiency per unit time when fouling in an amount that significantly reduces the efficiency occurs. When the rate-of-change determination unit 106 determines that the elapsed rate of change exceeds the reference rate of change, it sends an instruction to the additional cleaning instruction unit 107 to start cleaning.

[0078] Upon receiving an instruction from the rate-of-change determination unit 106, the additional cleaning instruction unit 107 sends an instruction to the oil supply unit 5 to supply oil to the compressor 3. The additional cleaning instruction unit 107 sends an instruction to change the opening degree of the oil supply adjustment valve 53 so as to supply oil to the compressor 3 for a short-term cleaning time Ta, which is a cleaning time Ta shorter than the cleaning time Tt under the regular cleaning conditions.

[0079] In such a compressor system 1A of the second embodiment, during the implementation of oil injection under the regular cleaning conditions by the cleaning instruction unit 91, short-term oil injection is implemented by the additional cleaning instruction unit 107.

[0080] Specifically, the elapsed rate-of-change acquisition unit 105 obtains the elapsed rate of change of the compressor 3 during operation from the information on the operation status of the compressor 3 during operation at the cleaning cycle Tc obtained by the compressor information acquisition unit 6. Whether or not the obtained elapsed rate of change exceeds the reference rate of change is determined by the rate-of-change determination unit 106. When it is determined that the elapsed rate of change exceeds the reference rate of change, an instruction to start cleaning is sent to the additional cleaning instruction unit 107. As a result, as shown in FIG. 7, after the supply of oil under the regular cleaning conditions, the oil supply adjustment valve 53 opens for the short-term cleaning time Ta, and oil is supplied to the compressor 3 for a short time before being supplied regularly.

[0081] (Function and effect) In the compressor system 1A configured as described above, when the rate-of-change determination unit 106 determines that the elapsed rate of change exceeds the reference rate of change, the additional cleaning instruction unit 107 issues a cleaning instruction separately from the cleaning instruction unit 91. Generally, in a situation where oil is not being supplied to the compressor 3 during the cleaning cycle Tc, as shown in FIG. 7, the efficiency of the actually operating compressor 3 does not linearly change like a first-order curve as shown in FIGS. 4 and 5, but as shown in FIG. 7, it may increase with a larger slope over time, like a second-order curve, drawing a parabola. When the efficiency of the compressor 3 changes in this way, it may deteriorate rapidly when a certain amount of time has elapsed since the supply of oil ended (since the start of the cleaning cycle Tc). In contrast, in the second embodiment, after the supply of oil under the regular cleaning conditions, the additional cleaning instruction unit 107 causes the oil supply adjustment valve 53 to open for a short cleaning time Ta, and oil is supplied to the compressor 3 for a short time before the regular supply. As a result, fouling can be removed at a stage where the efficiency has significantly decreased in a state where oil is not being supplied under the regular cleaning conditions. Therefore, efficient removal of fouling can be performed with a minimum oil supply amount.

[0082] <Third Embodiment> Next, a third embodiment of the compressor system according to the present disclosure will be described. In the third embodiment described below, components common to the first and second embodiments are denoted by the same reference numerals in the drawings, and their description will be omitted.

[0083] (Configuration of Supply Control Unit) As shown in FIG. 8, in the compressor system 1B of the third embodiment, the configuration of the supply control unit 9B is different. The supply control unit 9B of the third embodiment further includes a maintenance cost acquisition unit 109.

[0084] The maintenance cost acquisition unit 109 acquires the maintenance cost when maintaining the compressor 3 from the information on the operating status of the compressor 3. In the maintenance cost acquisition unit 109 of the present embodiment, information on the operating status of the operating compressor 3 is input from the compressor information acquisition unit 6. The maintenance cost acquisition unit 109 calculates the state of the compressor 3 based on the information on the operating status of the compressor 3, and calculates and acquires costs such as disassembly and assembly costs and transfer costs of replacement and repair parts when maintaining the compressor 3.

[0085] The cost relationship acquisition unit 97B acquires the maintenance cost acquired by the maintenance cost acquisition unit 109 in addition to the operation cost and the oil cost. The cost relationship acquisition unit 97B acquires the relationship between the maintenance cost, the operation cost, and the oil cost as a provisional relationship value.

[0086] (Function and effect) In the compressor system 1B having the above configuration, the cost relationship acquisition unit 97B acquires a provisional relationship value that includes not only the operation cost and the oil cost but also the maintenance cost. As a result, the operation cost and the oil cost during cleaning inside the compressor 3 with oil can be set as the optimal conditions after considering the maintenance cost. Therefore, the more optimal cleaning time Tt and cleaning cycle Tc can be easily obtained.

[0087] (Other embodiments) As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present disclosure are also included.

[0088] When the oil supply is not automatically performed, the supply control units 9, 9A, and 9B may not have the determination unit 98 and the cleaning condition setting unit 99. Even in such a case, since the optimal cleaning conditions can be acquired by the cost relationship acquisition unit 97, the oil can be manually supplied and cleaned by an operator.

[0089] The supply control units 9, 9A, and 9B may be a single device. That is, as in this embodiment, the supply control units 9, 9A, and 9B do not necessarily have to include an injection system control unit 901, a compressor operation data monitoring unit 902, and a remote monitoring unit 903. In that case, in the supply control units 9, 9A, and 9B, a cleaning instruction unit 91, a provisional cleaning instruction unit 92, a change rate acquisition unit 93, a supply amount acquisition unit 94, an operation cost acquisition unit 95, an oil cost acquisition unit 96, a cost relationship acquisition unit 97, a determination unit 98, and a cleaning condition setting unit 99 are executed only by a single computer 950.

[0090] Also, the change rate acquisition unit 93 of this embodiment calculates and acquires the change rate of the efficiency of the compressor 3 during operation based on the information on the operation status of the compressor 3 acquired by the compressor information acquisition unit 6. However, the change rate of the efficiency of the compressor 3 is not limited to being based on the acquired information on the operation status of the compressor 3. That is, the change rate of the efficiency of the compressor 3 does not have to be based on the information on the compressor 3 during operation. For example, the change rate acquisition unit 93 may acquire the change rate of the efficiency of the compressor 3 estimated based on a compressor deterioration model obtained by modeling the efficiency of the compressor 3 over time. In this way, by acquiring the change rate of the efficiency of the compressor 3 estimated based on the compressor deterioration model, it is possible to acquire the change rate of the efficiency of the compressor 3 without installing a device for acquiring information on the compressor 3 during operation, such as the compressor information acquisition unit 6. As a result, the cost of the compressor system 1 can be reduced.

[0091] Also, the maintenance cost acquisition unit 109 in the third embodiment may acquire the coating repair cost for suppressing fouling as the maintenance cost. Generally, the wall surface of the flow path of the compressor 3 may be coated with PTFE or electroless nickel for suppressing fouling. When fouling is removed by supplying oil, a part of this coating is eroded together, and repair is required. Therefore, by acquiring the coating repair cost with the maintenance cost acquisition unit 109, it is possible to easily acquire the more optimal cleaning time Tt and cleaning cycle Tc in consideration of the maintenance cost including the repair of the coating.

[0092] Note that the coating repair cost can be calculated based on, for example, the erosion degree (damage level) of the coating estimated from the history information (cumulative time, cumulative number of times, etc.) of oil supply. Further, the maintenance cost acquisition unit 109 may be configured to send the history information and the erosion degree of the coating to the display unit 100 for display.

[0093] <Appendix> The compressor system 1 described in the embodiment is understood as follows, for example.

[0094] (1) The compressor system 1 according to the first aspect includes a compressor 3 that compresses gas supplied to a flow path formed inside, a water supply unit 4 that supplies water to the flow path inside the compressor 3 during operation, an oil supply unit 5 that supplies oil to the flow path inside the compressor 3 where the water is supplied, a supply control unit 9 that controls the supply state of the water to the compressor 3 by the water supply unit 4 and the supply state of the oil to the compressor 3 by the oil supply unit 5, and an oil information acquisition unit 7 that acquires information on the supply situation of the oil supplied from the oil supply unit 5 to the compressor 3. The supply control unit 9 sends an instruction to the water supply unit 4 to supply the water to the compressor 3, and a cleaning instruction unit 91 that sends an instruction to the oil supply unit 5 to supply the oil to the compressor 3 under cleaning conditions having a set cleaning time Tt and a cleaning cycle Tc, a provisional cleaning instruction unit 92 that sends an instruction to the oil supply unit 5 to supply the oil to the compressor 3 under a plurality of provisional cleaning conditions having different predetermined cleaning times Tt and cleaning cycles Tc, a change rate acquisition unit 93 that acquires a change rate of the efficiency of the compressor 3 from information on the operating situation of the compressor 3, a supply amount acquisition unit 94 that acquires the supply amount of the oil from the information on the supply situation of the oil acquired by the oil information acquisition unit 7, an operating cost acquisition unit 95 that acquires the operating cost at the cleaning cycle Tc from the change rate acquired by the change rate acquisition unit 93, an oil cost acquisition unit 96 that acquires the oil cost at the cleaning time Tt from the supply amount of the oil acquired by the supply amount acquisition unit 94, and a cost relationship acquisition unit 97 that acquires a plurality of provisional relationship values which are the relationships of the operating cost and the oil cost under each of the plurality of provisional cleaning conditions from the operating cost acquired by the operating cost acquisition unit 95 and the oil cost acquired by the oil cost acquisition unit 96.

[0095] In this compressor system 1, a cost relationship acquisition unit 97 acquires tentative relationship values representing the relationships between the operating cost and the oil cost under each of a plurality of tentative cleaning conditions having different predetermined cleaning times Tt and cleaning periods Tc. As a result, the relationships between the operating cost and the oil cost under a plurality of conditions with different cleaning times Tt for supplying oil and cleaning periods Tc which is the interval until the next oil supply can be grasped. Therefore, it is possible to grasp how the relationships between the operating cost and the oil cost vary with changes in the cleaning time Tt and the cleaning period Tc. Thereby, the optimal cleaning time Tt and the cleaning period Tc for setting the operating cost and the oil cost during cleaning in the compressor 3 with oil to the required optimal conditions can be easily obtained.

[0096] (2) The compressor system 1 according to the second aspect is the compressor system 1 of (1), further comprising a display unit 100 that displays the tentative relationship values acquired by the cost relationship acquisition unit 97.

[0097] Thereby, the operator can easily grasp the information of the tentative relationship values and confirm their validity.

[0098] (3) The compressor system 1 according to the third aspect is the compressor system 1 of (1) or (2), further comprising a remote operation unit 101 capable of changing the cleaning time Tt and the cleaning period Tc by sending an instruction from a remote location to the cleaning instruction unit 91.

[0099] Thereby, the timing of supplying oil by the oil supply unit 5 can be easily adjusted from a position remote from the oil supply unit 5 and the cleaning instruction unit 91.

[0100] (4) The compressor system 1 according to the fourth aspect is any one of the compressor systems 1 of (1) to (3), and the supply control unit 9 determines whether any one of the plurality of provisional relationship values acquired by the cost relationship acquisition unit 97 satisfies an optimal reference value determined in advance when operating the compressor 3. A determination unit 98; and when any one of the provisional relationship values satisfies the optimal reference value in the determination unit 98, the cleaning time Tt and the cleaning cycle Tc corresponding to the provisional relationship value that satisfies the optimal reference value are used as regular cleaning conditions. And a cleaning condition setting unit 99 that sends an instruction to set the regular cleaning condition to the cleaning instruction unit 91.

[0101] Thereby, the optimal cleaning time Tt and cleaning cycle Tc during cleaning in the compressor 3 with oil can be automatically instructed to the oil supply unit 5. Therefore, oil injection can be automatically performed at the optimal cleaning time Tt and cleaning cycle Tc without the intervention of an operator.

[0102] (5) The compressor system 1 according to the fifth aspect is the compressor system 1 of (4), and when all of the provisional relationship values do not satisfy the optimal reference value, the determination unit 98 has a cleaning time Tt and a cleaning cycle Tc different from the plurality of provisional cleaning conditions. Send an instruction to the provisional cleaning instruction unit 92 to set a new provisional cleaning condition, and the provisional cleaning instruction unit 92 sends an instruction to the oil supply unit 5 to supply the oil to the compressor 3 under the new provisional cleaning condition. The cost relationship acquisition unit 97 acquires a re-acquisition relationship value that is a relationship between the operation cost and the oil cost under the new provisional cleaning condition, and the determination unit 98 determines whether the optimal reference value is satisfied by the re-acquisition relationship value acquired by the cost relationship acquisition unit 97. When the re-acquisition relationship value satisfies the optimal reference value in the determination unit 98, the cleaning condition setting unit 99 acquires the regular cleaning condition based on the re-acquisition relationship value and sends an instruction to set it to the cleaning instruction unit 91.

[0103] As a result, even if there is no optimal cleaning time Tt and cleaning cycle Tc among a plurality of preset provisional cleaning conditions, the optimal cleaning time Tt and cleaning cycle Tc can be automatically searched for and obtained. As a result, the optimal cleaning time Tt and cleaning cycle Tc during cleaning in the compressor 3 with oil can be easily obtained with high accuracy.

[0104] (6) The compressor system 1 according to the sixth aspect is the compressor system 1 according to (4) or (5), wherein in the determination unit 98, the optimal reference value is at least one upper limit value of the operating cost and the oil cost allowable when operating the compressor 3.

[0105] As a result, at least one of the operating cost and the oil cost during cleaning in the compressor 3 with oil can be kept within an acceptable range as the compressor system 1.

[0106] (7) The compressor system 1 according to the seventh aspect is the compressor system 1 according to any one of (4) to (6), wherein the supply control unit 9 includes an elapsed change rate acquisition unit 105 that acquires an elapsed change rate, which is a change rate of the efficiency of the compressor 3 per predetermined time in a situation where the oil is not supplied, based on information on the operating status of the compressor 3; a change rate determination unit 106 that determines whether or not the elapsed change rate acquired by the elapsed change rate acquisition unit 105 exceeds a predetermined reference change rate; and an additional cleaning instruction unit 107 that sends an instruction to the oil supply unit 5 to supply the oil to the compressor 3 when the change rate determination unit 106 determines that the elapsed change rate exceeds the reference change rate.

[0107] As a result, by the additional cleaning instruction unit 107, after the oil is supplied, the oil supply adjustment valve 53 opens for a short cleaning time Ta, and the oil is supplied to the compressor 3 for a short time before being supplied regularly. As a result, fouling can be removed at a stage where the efficiency drops significantly in a state where oil is not supplied under the regular cleaning conditions. Therefore, efficient removal of fouling can be performed with a minimum oil supply amount.

[0108] (8) The compressor system 1 according to the eighth aspect is any one of the compressor systems 1 from (1) to (7), and further includes a compressor information acquisition unit 6 that acquires information on the operating status of the compressor 3. The change rate acquisition unit 93 acquires the change rate of the efficiency of the compressor 3 during operation based on the information on the operating status of the compressor 3 acquired by the compressor information acquisition unit 6.

[0109] Thereby, information for accurately grasping the state of the actually operating compressor 3 can be obtained. Thereby, the operating cost during cleaning inside the compressor 3 with oil can be obtained with high accuracy.

[0110] (9) The compressor system 1 according to the ninth aspect is any one of the compressor systems 1 from (1) to (8), and the supply control unit 9 further has a maintenance cost acquisition unit 109 that acquires the maintenance cost when the compressor 3 is maintained from the information on the operating state of the compressor 3. The cost relationship acquisition unit 97 further acquires the relationship between the maintenance cost acquired by the maintenance cost acquisition unit 109, the operating cost, and the oil cost.

[0111] Thereby, the operating cost and the oil cost during cleaning inside the compressor 3 with oil can be set to the optimal conditions in consideration of the maintenance cost. Therefore, the more optimal cleaning time Tt and cleaning cycle Tc can be easily obtained.

[0112] (10) The compressor system 1 according to the tenth aspect is any one of the compressor systems 1 from (1) to (9), and the change rate acquisition unit 93 acquires the change rate of the efficiency of the compressor 3 estimated based on a compressor 3 deterioration model obtained by modeling the efficiency of the compressor 3 over time.

[0113] Thereby, the change rate of the efficiency of the compressor 3 can be acquired without installing a device for acquiring information on the operating compressor 3. As a result, the cost of the compressor system 1 can be reduced.

Explanation of Signs

[0114] 1, 1A, 1B Compressor System 2 Drive Machine O Axis 21 Drive Shaft 3 Compressor 31 Rotating Shaft 32 Supply Line 33 Discharge Line 4 Water Supply Unit 41 Cooling Water Supply Source 42 Cooling Water Supply Line 43 Cooling Water Supply Control Valve 5 Oil Supply Unit 51 Oil Supply Source 52 Oil Supply Line 53 Oil Supply Control Valve 6 Compressor Information Acquisition Unit 7 Oil Information Acquisition Unit 8 Cooling Water Information Acquisition Unit 9, 9A, 9B Supply Control Unit 901 Injection System Control Unit 902 Compressor Operation Data Monitoring Unit 903 Remote Monitoring Unit 91 Cleaning Instruction Unit 92 Provisional Cleaning Instruction Unit 93 Rate of Change Acquisition Unit 94 Supply Quantity Acquisition Unit 95 Operating Cost Acquisition Unit 96 Oil Cost Acquisition Unit 97, 97B Cost Relationship Acquisition Unit 98 Judgment Unit 99 Cleaning Condition Setting Unit 100 Display Unit 101 Remote Operation Unit 950 Computer 951 Processor 952 Main Memory 953 Storage 954 Interface Tt Cleaning Time Tc Cleaning Cycle 105 Elapsed Rate of Change Acquisition Unit 106 Change rate determination unit 107 Additional cleaning instruction unit 109 Maintenance cost acquisition unit

Claims

1. A compressor that compresses gas supplied to a flow path formed inside; A water supply unit that supplies water to the flow path inside the compressor during operation; An oil supply unit that supplies oil to the flow path inside the compressor to which the water is supplied; A supply control unit that controls the supply state of the water to the compressor in the water supply unit and the supply state of the oil to the compressor in the oil supply unit; An oil information acquisition unit that acquires information on the supply status of the oil supplied from the oil supply unit to the compressor, and The supply control unit A cleaning instruction unit that sends an instruction to the water supply unit to supply the water to the compressor and sends an instruction to the oil supply unit to supply the oil to the compressor under cleaning conditions having a set cleaning time and cleaning cycle; A provisional cleaning instruction unit that sends an instruction to the oil supply unit to supply the oil to the compressor under a plurality of provisional cleaning conditions having different predetermined cleaning times and cleaning cycles; A change rate acquisition unit that acquires a change rate of the efficiency of the compressor from information on the operating status of the compressor; A supply amount acquisition unit that acquires the supply amount of the oil from the information on the supply status of the oil acquired by the oil information acquisition unit; An operating cost acquisition unit that acquires the operating cost during the cleaning cycle from the change rate acquired by the change rate acquisition unit; An oil cost acquisition unit that acquires the oil cost during the cleaning time from the supply amount of the oil acquired by the supply amount acquisition unit; A compressor system having a cost relationship acquisition unit that acquires a plurality of provisional relationship values representing the relationship between the operating cost and the oil cost for each of the plurality of provisional cleaning conditions from the operating cost acquired by the operating cost acquisition unit and the oil cost acquired by the oil cost acquisition unit.

2. The compressor system according to claim 1, further comprising a display unit that displays the provisional relationship values acquired by the cost relationship acquisition unit.

3. The compressor system according to claim 1 or 2, further comprising a remote operation unit that can change the cleaning time and the cleaning cycle by sending an instruction to the cleaning instruction unit from a remote location.

4. The supply control unit A determination unit that determines whether any one of a plurality of the provisional relationship values acquired by the cost relationship acquisition unit satisfies a predetermined optimum reference value when operating the compressor. When any one of the provisional relationship values satisfies the optimal reference value in the determination unit, the cleaning time and the cleaning cycle corresponding to the provisional relationship value that satisfies the optimal reference value are acquired as regular cleaning conditions, and the cleaning condition setting unit that sends an instruction to set the regular cleaning conditions to the cleaning instruction unit. The compressor system according to any one of claims 1 to 3.

5. When all of the provisional relationship values do not satisfy the optimal reference value, the determination unit sends an instruction to the provisional cleaning instruction unit to set new provisional cleaning conditions having a cleaning time and a cleaning cycle different from the plurality of provisional cleaning conditions. The provisional cleaning instruction unit sends an instruction to the oil supply unit to supply the oil to the compressor under the new provisional cleaning conditions. The cost relationship acquisition unit acquires a re-acquisition relationship value that is the relationship between the operation cost and the oil cost under the new provisional cleaning conditions. The determination unit determines whether the optimal reference value is satisfied by the re-acquisition relationship value acquired by the cost relationship acquisition unit. When the re-acquisition relationship value satisfies the optimal reference value in the determination unit, the cleaning condition setting unit acquires the regular cleaning conditions based on the re-acquisition relationship value and sends an instruction to set them to the cleaning instruction unit. The compressor system according to claim 4.

6. In the determination unit, the optimal reference value is at least an upper limit value of at least one of the operation cost and the oil cost that is allowable when operating the compressor. The compressor system according to claim 4 or 5.

7. The supply control unit An elapsed change rate acquisition unit that acquires an elapsed change rate, which is a change rate of the efficiency of the compressor per unit time in a situation where the oil is not supplied, based on information on the operating status of the compressor. A change rate determination unit that determines whether the elapsed change rate acquired by the elapsed change rate acquisition unit exceeds a predetermined reference change rate. When the change rate determination unit determines that the elapsed change rate exceeds the reference change rate, an additional cleaning instruction unit that sends an instruction to the oil supply unit to supply the oil to the compressor. The compressor system according to any one of claims 4 to 6.

8. Further provided with a compressor information acquisition unit that acquires information on the operating status of the compressor. The compressor system according to any one of claims 1 to 7, wherein the change rate acquisition unit acquires the change rate of the efficiency of the compressor during operation based on the information on the operating status of the compressor acquired by the compressor information acquisition unit.

9. The supply control unit further includes a maintenance cost acquisition unit that acquires the maintenance cost when the compressor is maintained from the information on the operating state of the compressor. The compressor system according to any one of claims 1 to 8, wherein the cost relationship acquisition unit further acquires the relationship between the maintenance cost acquired by the maintenance cost acquisition unit, the operating cost, and the oil cost.

10. The compressor system according to any one of claims 1 to 9, wherein the change rate acquisition unit acquires the change rate of the efficiency of the compressor estimated based on a compressor deterioration model obtained by modeling the efficiency of the compressor over time.

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