KR20150144437A - A Maintenance Apparatus and Method Of Pump and A Treatment System of Liquefied Gas having same - Google Patents

Abstract

The present invention relates to a pump management device comprising: a flow line; a sensor; and a control unit. The present invention relates to a liquefied gas treatment system comprising: a flow line; a pump; a heat exchanger; a sensor; and a control unit. The present invention relates to a pump management method comprising the steps of: operating the liquefied gas treatment system; counting cavitations; resetting a predetermined maintenance period of a pump; stopping operation of the liquefied gas treatment system; and performing maintenance of the pump. According to one embodiment of the present invention, the pump management device and pump management method and the liquefied gas treatment system having the same maximize reliability and stability of the pump.

Description

TECHNICAL FIELD [0001] The present invention relates to a pump management apparatus and method, and a liquefied gas processing system including the same.

The present invention relates to a pump management apparatus and method and a liquefied gas processing system including the same.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

These liquefied gases are supplied to various customers and used. Recently, LNG carrier that uses LNG as fuel for LNG carriers that transport liquefied natural gas has been developed. The method used is applied to ships other than LNG carriers.

In order to supply the liquefied gas to the customer, the pump and the heat exchanger are used to supply the pressure and the temperature of the liquefied gas required by the customer to the customer. Since it is essential to inspect and repair the components for the safe operation of such a system, recently, research and development have been continuously carried out in order to perform maintenance and repair of the pump in a timely and accurate manner, that is, for effective maintenance.

It is an object of the present invention to provide a control unit for controlling the operation of the pump by measuring the cavitation occurring in the pump with the sensor and resetting the maintenance time of the pump to improve the maintenance and reliability and reliability of the pump And a liquefied gas processing system including the same.

A pump management apparatus according to an embodiment of the present invention includes: a flow line to which a pump is connected; A sensor for sensing cavitation of the pump; And a controller for resetting the predetermined maintenance period of the pump through the sensed value of the cavitation measured from the sensor.

Specifically, the flow line includes: a first flow line for supplying fluid to the pump; And a second flow line for discharging fluid from the pump, wherein the sensor comprises: a first sensor provided in the first flow line and measuring a pressure, temperature or flow rate of the fluid supplied to the pump; And a second sensor provided in the first flow line for measuring a temperature of fluid discharged from the pump.

Specifically, the control unit may include: a time calculating unit that calculates a passage of time of the cavitation through the value of the pressure, the temperature, or the flow rate of the fluid measured by the first sensor; And a count calculating unit for calculating the number of cavitation occurrences through a signal received from the first sensor. The maintenance expense time can be calculated based on the cavitation elapsed time and the number of cavitation occurrences, and the maintenance period can be set .

Specifically, the maintenance period may be a difference between the predetermined maintenance period and the maintenance / reduction period calculated through the time calculator and the number calculator.

Specifically, the time calculator may calculate the lapse time of the cavitation through a value of the temperature of the fluid measured by the second sensor.

Specifically, the alarm unit may further include an alarm unit for alerting the operator when the operating time of the pump and the error range of the maintenance period are 5 to 8%.

A liquefied gas processing system according to an embodiment of the present invention includes: a flow line connecting a liquefied gas storage tank and a customer; A pump provided in the flow line to pressurize the liquefied gas; A heat exchanger provided in the flow line for heating the liquefied gas; A sensor for sensing cavitation of the pump; And a control unit for re-setting a maintenance period by changing a preset maintenance period through the cavitation measured from the sensor, wherein the control unit is configured to control the operation of the pump based on the difference between the driving time of the pump and the maintenance period, And when it is 4%, the driving of the pump is stopped.

Specifically, the flow line includes: a first flow line for supplying fluid to the pump; And a second flow line for discharging fluid from the pump, wherein the sensor comprises: a first sensor provided in the first flow line and measuring a pressure or temperature of fluid supplied to the pump; And a second sensor provided in the first flow line for measuring a temperature of fluid discharged from the pump.

Specifically, the control unit may include: a time calculation unit for calculating a lapse time of the cavitation through the pressure or the temperature of the fluid measured by the first sensor; And a count calculating unit for calculating the number of cavitation occurrences through a signal received from the first sensor. The maintenance expense time can be calculated based on the cavitation elapsed time and the number of cavitation occurrences, and the maintenance period can be set .

Specifically, the alarm unit may further include an alarm unit for alerting the operator when the operating time of the pump and the error range of the maintenance period are 5 to 8%.

A pump management method according to an embodiment of the present invention is a method for managing a pump in a liquefied gas processing system driven through a pump management system, the method comprising: driving the liquefied gas processing system; Counting cavitation occurring in the pump; Resetting a predetermined maintenance period of the pump; Stopping the operation of the liquefied gas processing system when the operating time of the pump is within an error range of the reset maintenance period of 2 to 4%; And performing maintenance of the pump.

Specifically, the alarm unit may further include an alarm unit for alerting the operator when the operating time of the pump and the error range of the reset maintenance period are 5 to 8%.

Specifically, the step of stopping the operation of the liquefied gas processing system includes: stopping the driving of the pump; And operating the alarm unit.

The pump management apparatus and method and the liquefied gas processing system including the pump management apparatus according to an embodiment of the present invention reestablish the maintenance period of the pump by using cavitation in the pump, Maintenance of the pump can be performed, and reliability and stability of the pump can be maximized.

In addition, the operation of the liquefied gas processing system can be prevented from being interrupted due to the sudden breakage of the pump or the like, thereby improving the reliability and stability of the liquefied gas processing system.

1 is a conceptual diagram of a liquefied gas processing system having a pump management apparatus according to an embodiment of the present invention.
2 is a flowchart of a pump management method according to an embodiment of the present invention.
3 is a partial flow diagram of a pump management method in accordance with an embodiment of the present invention.
4 is a conceptual diagram of a controller of a pump management apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a conceptual diagram of a liquefied gas processing system having a pump management apparatus according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram of a controller of a pump management apparatus according to an embodiment of the present invention.

1 and 4, a liquefied gas processing system 1 including a pump management apparatus 50 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a heat exchanger 30, , A customer (40), and a pump management device (50).

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to evaporative gases. In addition, LNG can be used to mean not only NG (Natural Gas) in liquid state but also NG in supercritical state for convenience, and evaporation gas can be used to include not only gaseous evaporation gas but also liquefied evaporation gas have.

The liquefied gas storage tank 10 stores liquefied gas to be supplied to the customer 40. The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, wherein the liquefied gas storage tank 10 may have the form of a pressure tank.

The liquefied gas storage tank 10 includes an outer tank (not shown), an inner tank (not shown), and a heat insulating portion (not shown). The outer tank is a structure constituting the outer wall of the liquefied gas, and may be formed of steel, and may have a polygonal cross section.

The inner tank is provided inside the outer tank, and can be supported and supported inside the outer tank by a support (not shown). At this time, the support may be provided on the lower end of the inner tank, and may be provided on the side of the inner tank for suppressing lateral movement of the inner tank.

The tanks may be made of stainless steel and designed to withstand pressures from 1 bar to 10 bar (6 bar, for example). The reason why the inner tank is designed to withstand such a constant pressure is that the inner pressure of the inner tank can be increased as the liquefied gas contained in the inner tank is evaporated and the evaporation gas is generated.

A baffle (not shown) may be provided in the inner tank. The baffle means a plate in the form of a lattice. As the baffle is installed, the pressure inside the tank can be evenly distributed to prevent the tank pressure from being concentrated to a part of the tank.

The heat insulating portion is provided between the inner tank and the outer tank and can prevent the external heat energy from being transmitted to the inner tank. At this time, the heat insulating portion may be in a vacuum state. By forming the adiabatic portion in a vacuum, the liquefied gas storage tank 10 can more efficiently withstand higher pressures as compared to a conventional tank. For example, the liquefied gas storage tank 10 can sustain a pressure of 5 to 20 bar through the vacuum insulation.

As described above, in this embodiment, the use of the pressure tank type liquefied gas storage tank 10 having a vacuum type heat insulating portion between the outer tanks and the inner tank makes it possible to minimize the generation of the evaporated gas, It is possible to prevent a problem such as breakage of the storage tank 10 from occurring.

The present invention further includes a flow line 11 connecting the liquefied gas storage tank 10 and the customer 40.

The flow line 11 can connect the pump 20, the heat exchanger 30, the first sensor 51, and the second sensor 52, which will be described later, and the liquefied gas stored in the liquefied gas storage tank 10 The pump 20, and the heat exchanger 30 to the demander 40. [0050]

The flow line 11 also includes a first flow line 11a for supplying a fluid (e.g., a liquefied gas) to the pump 20 and a second flow line 11b for discharging fluid (e.g., liquefied gas) And a second flow line 11b.

A flow valve (not shown) is provided in the flow line 11 so that the supply amount of the liquefied gas can be adjusted according to the opening degree of the flow valve.

The heat exchanger 30 is provided on the flow line 11 between the consumer 40 and the pump 20 and heats the liquefied gas supplied from the pump 20. The heat exchanger 30 can supply the liquefied gas in the supercooled liquid state or the supercritical state to the consumer 40 while heating the liquefied gas while maintaining the pressure discharged from the pump 20.

The heat exchanger 30 heats the liquefied gas using glycol water supplied from steam or a glycol heater (not shown) supplied through a boiler (not shown), or heats the liquefied gas using electric energy Or it may heat the liquefied gas using waste heat generated from a generator (not shown) or other equipment (not shown) provided on a ship (not shown).

The customer 40 may include all devices and mechanisms driven through the vaporized liquefied gas supplied from the heat exchanger 30. [ At this time, the customer 40 may be an engine driven through the liquefied gas supplied from the liquefied gas storage tank 10 to generate thrust. The engine may be a MEGI engine, or a dual fuel engine.

In the case where the engine is a dual fuel engine, liquefied gas or oil may be selectively supplied without being supplied with a mixture of liquefied gas and oil. This is to prevent mixing of two materials having different combustion temperatures to prevent the efficiency of the engine from deteriorating.

As the piston (not shown) inside the cylinder (not shown) reciprocates by the combustion of the liquefied gas, the engine rotates the crankshaft (not shown) connected to the piston and the shaft Can be rotated. Therefore, as the propeller (not shown) connected to the shaft finally rotates when the engine is driven, the hull is moved forward or backward.

Of course, in this embodiment, the engine may be an engine for driving the propeller, but it may be an engine for generating power or an engine for generating other power. That is, the present embodiment does not specifically limit the type of engine. However, the engine may be an internal combustion engine that generates driving force by combustion of the liquefied gas.

The pump management device 50 includes a pump 20, a first sensor 51, a second sensor 52, a control unit 60, and an alarm unit 70.

The pump 20 is provided on the flow line 11 and pressurizes the liquefied gas discharged from the liquefied gas storage tank 10 to a high pressure. In the embodiment of the present invention, the pump 20 may be a high pressure reciprocating pump, but is not limited thereto.

The pump 20 has a preset maintenance period set by a manufacturer (not shown). Therefore, the operator (not shown) stops the operation of the pump 20 and carries out the maintenance of the pump 20 at the preset maintenance period.

However, the preset maintenance period set by the manufacturer is not set in consideration of the cavitation generated in the pump 20.

Specifically, the cavitation phenomenon is a phenomenon that a part of the liquid state material changes into a gas (bubble) due to a change in the external environment such as a temperature or a pressure to weaken the durability of the drive device of the pump 20, .

The cavitation phenomenon occurs when the pump 20 does not satisfy the net positive suction head (NPSH) required by the pump 20, and when the liquid flowing in the flow line 11 connected to the pump 20 reaches the external temperature It may occur when bubbles generated by evaporation due to the change are directly introduced.

As described above, the cavitation phenomenon may reduce the compression efficiency and the durability of the pump 20, or may damage the pump 20. In order to prevent this, it is necessary to change the preset maintenance period. However, The maintenance and repair of the liquefied gas processing system 20 can not be performed timely and accurately, and furthermore, the driving of the entire liquefied gas processing system 1 is stopped.

 Therefore, in the embodiment of the present invention, the maintenance period of the proper pump 20 can be known by re-setting the predetermined maintenance period by providing the pump management device 50 so that the maintenance of the pump 20 can be effectively performed So that the reliability and stability of the pump 20 are maximized.

In addition, it is possible to prevent the entire operation of the liquefied gas processing system 1 from being interrupted due to the breakage of the pump 20, for example, thereby improving the reliability and stability of the liquefied gas processing system 1 have.

Hereinafter, the first sensor 51, the second sensor 52, the controller 60, and the alarm unit 70 will be described in detail so as to grasp the resetting of the preset maintenance period in detail.

Sensors 51 and 52 are provided in the flow line 11 to sense the cavitation of the pump 20 and include a first sensor 51 and a second sensor 52.

The first sensor 51 can measure the pressure, the temperature or the flow rate of the fluid (preferably liquefied gas) supplied to the pump 20 provided in the first flow line 11a, and the second sensor 52 Is capable of measuring the temperature of fluid (preferably liquefied gas) that is provided in the second flow line 11b and discharged to the pump 20.

The sensors 51 and 52 can transmit the measured values to the control unit 60 by wire or wirelessly.

The control unit (60) resets the preset maintenance period through the cavitation measured by the sensors (51, 52).

The control unit 60 may include a time calculating unit 61 and a number calculating unit 62. [ The time calculating unit 61 may calculate the cavitation occurrence time based on the pressure, temperature, or flow rate of the fluid measured by the first sensor 51. The number calculating unit 62 may calculate the cavitation occurrence time using the first sensor 51, The number of cavitation occurrences can be calculated through a signal received at the time of the occurrence of cavitation.

The time calculator 61 may adjust the period of time for generating the cavitation through the value of the temperature of the fluid (preferably liquefied gas) measured by the second sensor 52.

If the pressure or flow rate of the fluid is lower than the predetermined NPSH, that is, the effective suction head, in the pump 20, cavitation may occur in the pump 20. If the temperature of the fluid is equal to or lower than the boiling point The pump 20 may be cavitated.

Accordingly, the control unit 60 can determine the time point at which the cavitation occurs and the end point of the cavitation through the pressure, flow rate, and temperature of the fluid measured by the first sensor 51 and the second sensor 52, Time and the number of cavitation occurrences.

The control unit 60 can calculate the maintenance acceleration / deceleration time based on the cavitation occurrence time calculated by the time calculation unit 61 and the cavitation occurrence frequency calculated by the time calculation unit 62. [ The calculation of the maintenance acceleration / deceleration time can be calculated by the maintenance time / expense schedule according to the cavitation occurrence time and the number of cavitation occurrence times.

For example, if the number of cavitation occurrences is increased by one, the maintenance acceleration / deceleration time may be reduced by one day. If the cavitation occurrence time exceeds the preset safety time value by one hour, the maintenance acceleration / It can be reduced by one day in the maintenance / reduction time reduced by the number of occurrence of the phenomenon. The number of cavitation occurrences and cavitation occurrence times and the maintenance add / drop times may be proportional or exponential.

The control unit 60 can calculate the maintenance period by calculating the difference between the predetermined maintenance period and the maintenance period. Therefore, the control unit 60 can calculate the maintenance period that is temporarily reduced by the cavitation phenomenon in real time even when the liquefied gas processing system 1 is continuously driven, and when the driving period of the pump 20 exceeds the maintenance period Real time can be grasped.

Accordingly, in the embodiment of the present invention, the maintenance and repair of the pump 20 can be carried out in a timely and accurate manner, the maintenance of the pump 20 can be effectively performed, and the reliability and stability of the pump 20 can be improved .

The control unit 60 can receive the measured values from the sensors 51 and 52 by wire or wirelessly and can transmit the drive signal to the alarm unit 70 to be described later by wire or wirelessly.

The alarm unit 70 is a function that when the drive time of the pump 20 exceeds the maintenance time (preferably when the drive time of the pump 20 and the error range of the maintenance time is 5 to 8%), Not shown) may be warned.

The alarm unit 70 can receive the driving signal by the control unit 60 in a wired or wireless manner and can send a signal to the operator to stop the driving of the pump 20 by means of a warning lamp, have.

As such, the pump management apparatus 50 and the liquefied gas processing system 1 including the same according to the embodiment of the present invention are capable of operating the pump 20 by resetting the pump maintenance period using the cavitation in the pump 20 The maintenance period of the pump 20 can be known and the maintenance and repair of the pump 20 can be effectively performed, and the reliability and stability of the pump 20 can be maximized.

In addition, the operation of the liquefied gas processing system 1 can be prevented from being interrupted due to the sudden breakage of the pump 20 or the like, thereby improving the reliability and stability of the liquefied gas processing system 1 .

2 is a flowchart of a pump management method according to an embodiment of the present invention.

The pump management method in one embodiment of the present invention can be implemented by the liquefied gas processing system 1 having the pump management device 50 according to the embodiment described above, The steps will be described.

As shown in FIG. 2, the pump management method in an embodiment of the present invention includes: (S10) driving the liquefied gas processing system 1; Counting cavitation occurring in the pump 20 (S20); Resetting the predetermined maintenance period of the pump (S30); Stopping the operation of the liquefied gas processing system 1 when the driving time of the pump 20 has exceeded the reset maintenance period (S40); And performing maintenance of the pump 20 (S50).

Each step can be driven by a separately provided control unit 60. The control unit 60 has been described in the liquefied gas processing system 1 including the pump management apparatus 50 in the embodiment A description thereof will be omitted.

In step S10, the liquefied gas processing system 1 is driven. The liquefied gas processing system 1 may be composed of a pump 20, a heat exchanger 30, and other drive devices (not shown). Driving the liquefied gas processing system 1 may mean driving the constituent devices of the liquefied gas processing system 1 (pump 20, heat exchanger 30, and other drive devices).

The liquefied gas stored in the liquefied gas storage tank 10 is pressurized by the pump 20 and transferred to the heat exchanger 30 in the operation of the liquefied gas processing system 1 and the steam or the glycol water The liquefied gas heated by the heat exchange medium is supplied to the customer 20. That is, the liquefied gas is supplied from the liquefied gas storage tank 10 through the pump 20 and the heat exchanger 30 through the pressurization and heating to the customer 20 and used in the customer 20.

In step S20, cavitation generated in the pump 20 is counted. When the liquefied gas processing system 1 is driven, the pump 20 can also be driven to pressurize the liquefied gas. At this time, the liquefied gas may be supplied from the liquefied gas storage tank 10 to the pump 20.

Cavitation may occur during the driving of the pump 20. Fig. Specifically, the cavitation phenomenon is a phenomenon that a part of the liquid state material changes into a gas (bubble) due to a change in the external environment such as a temperature or a pressure to weaken the durability of the drive device of the pump 20, .

The cavitation phenomenon occurs when the pump 20 does not satisfy the net positive suction head (NPSH) required by the pump 20, and when the liquid flowing in the flow line 11 connected to the pump 20 reaches the external temperature It may occur when bubbles generated by evaporation due to the change are directly introduced.

Therefore, in the embodiment of the present invention, the maintenance period of the proper pump 20 can be known by counting the number of cavitation occurrences and resetting the predetermined maintenance period, thereby enabling effective maintenance of the pump 20 And the reliability and stability of the pump 20 are maximized.

The number of cavitation occurrences can be measured by the sensors 51 and 52 provided in the flow line 11 and the number of cavitation counts counted by the sensors 51 and 52 can be wired or controlled by the control unit 60 And can be wirelessly transmitted.

However, in the sensors 51 and 52, it is possible to measure not only the number of times of cavitation occurrence but also the time of occurrence of cavitation and the time of completion of cavitation, thereby measuring the time of occurrence of cavitation. The measured cavitation occurrence time point and the cavity end point may be transmitted to the control unit 60 by wire or wirelessly.

In step S30, the predetermined maintenance period of the pump 20 is reset.

As described in step S20, the cavitation phenomenon may reduce the compression efficiency and durability of the pump 20, or may cause damage to the pump 20. In order to prevent this, it is necessary to change the preset maintenance period. However, The pump 20 can not be inspected and repaired in a timely and accurate manner, and furthermore, the driving of the entire liquefied gas processing system 1 is stopped.

Therefore, in the embodiment of the present invention, the maintenance period is calculated by the controller 60 and the operator (not shown) is notified of the measured values by the sensors 51 and 52, And the pump 20 can be effectively maintained, and the reliability and stability of the pump 20 can be improved.

The control unit 60 can receive the cavitation occurrence time and the cavitation occurrence frequency measured by the sensors 51 and 52 by wire or wirelessly, and can calculate the maintenance charge / discharge period. The controller 60 calculates the maintenance / The maintenance period can be calculated by adding or subtracting in a predetermined preset maintenance period set by the user (not shown).

The calculation of the maintenance acceleration / deceleration time can be calculated by the maintenance time / expense schedule according to the cavitation occurrence time and the number of cavitation occurrence times.

For example, if the number of cavitation occurrences is increased by one, the maintenance acceleration / deceleration time may be reduced by one day. If the cavitation occurrence time exceeds the preset safety time value by one hour, the maintenance acceleration / It can be reduced by one day in the maintenance / reduction time reduced by the number of occurrence of the phenomenon. The number of cavitation occurrences and cavitation occurrence times and the maintenance add / drop times may be proportional or exponential.

The calculated maintenance period is a value obtained by resetting the preset maintenance period.

In step S40, when the driving time of the pump 20 exceeds the reset maintenance period, the operation of the liquefied gas processing system 1 is stopped. The pump 20 continues to drive, so that cavitation can continue to occur. Accordingly, the controller 60 can receive the values measured by the sensors 51 and 52 in real time and calculate the maintenance period in real time.

Further, the controller 60 may calculate the difference between the driving time of the pump 20 and the maintenance period that is changed in real time, and stop the operation of the liquefied gas processing system 1 when the error is within 2 to 4%.

Here, the operation interruption of the liquefied gas processing system 1 will be described in detail with reference to Fig.

3 is a partial flow diagram of a pump management method in accordance with an embodiment of the present invention.

As shown in FIG. 3, the pump management method according to an embodiment of the present invention includes: stopping the driving of the pump 20 (S41); And operating the alarm unit 70 (S42).

The alarm unit 70 can be driven by an alarm unit 70 provided separately in step S42 and the description of the alarm unit 70 can be performed by the liquefied gas processing system 1 including the pump management device 50 in the embodiment As we have seen, we will omit the explanation.

In step S41, the driving of the pump 20 is stopped. The supply of the liquefied gas stored in the liquefied gas storage tank 10 to the pump 20 can be stopped before the driving of the pump 20 is stopped.

After the driving of the pump 20 is stopped, the supply of the heat exchange medium supplied to the heat exchanger 30 is stopped, and the driving of the heat exchanger 30 can be stopped. However, the customer 20 may be supplied with auxiliary fuel by a preliminary supply system (not shown) and may not stop the drive.

In step S42, the alarm unit 70 is operated. The alarm unit 70 can warn the operator when the operating time of the pump and the error range of the reset maintenance period are 5 to 8%.

At this time, the alarm unit 70 can receive the driving signal by the control unit 60 by wire or wireless, and inform the operator of the stop of driving the pump 20 by means of a warning lamp, warning bell and warning display can send.

In step S50, maintenance of the pump 20 is performed. The pump 20 may be durable due to cavitation and massive damage or destruction of an internal device (not shown), which may be replaced or repaired to restore performance of the pump 20.

Alternatively, it is possible to quickly recover the driving of the liquefied gas processing system 1 by replacing it with a spare pump (not shown) provided as a spare.

When the maintenance or replacement of the pump 20 is completed, the liquefied gas processing system 1 can be driven again.

As described above, the pump management method according to the embodiment of the present invention resets the maintenance period of the pump by using cavitation in the pump 20, thereby knowing the maintenance period of the proper pump 20, Can be maintained and the reliability and stability of the pump 20 can be maximized.

In addition, the operation of the liquefied gas processing system 1 can be prevented from being interrupted due to the sudden breakage of the pump 20 or the like, thereby improving the reliability and stability of the liquefied gas processing system 1 .

1: liquefied gas processing system 10: liquefied gas storage tank
11: flow line 11a: first flow line
11b: second flow line 20: pump
30: heat exchanger 40: customer
50: Pump management device 51: First sensor
52: second sensor 60:
61: time calculating unit 62:
70: Alarm section

Claims (13)

A flow line to which the pump is connected;
A sensor for sensing cavitation of the pump;
And a controller for resetting the predetermined maintenance period of the pump through the sensed value of the cavitation measured from the sensor. 2. The apparatus of claim 1,
A first flow line for supplying fluid to the pump; And
And a second flow line for discharging fluid from the pump,
The sensor includes:
A first sensor provided in the first flow line for measuring pressure, temperature or flow rate of the fluid supplied to the pump; And
And a second sensor provided in the first flow line for measuring a temperature of fluid discharged from the pump. 3. The apparatus of claim 2,
A time calculating unit for calculating the time lapse of cavitation through the value of the pressure, temperature or flow rate of the fluid measured by the first sensor;
And a number calculator for calculating the number of cavitation occurrences through a signal received from the first sensor,
Wherein the controller calculates the maintenance acceleration / deceleration time based on the cavitation elapsed time and the number of cavitation occurrences, and sets the maintenance period. 4. The method according to claim 3,
Wherein the maintenance management period is a difference between the predetermined maintenance period and the maintenance period of time calculated through the time calculation unit and the number calculation unit. The apparatus according to claim 3,
Wherein the controller is able to reassemble the cavitation elapsed time through a value of the temperature of the fluid measured by the second sensor. 5. The method of claim 4,
Further comprising an alarm unit for alerting the operator when the operating time of the pump and the error range of the maintenance period are 5 to 8%. A flow line connecting the liquefied gas storage tank and the customer;
A pump provided in the flow line to pressurize the liquefied gas;
A heat exchanger provided in the flow line for heating the liquefied gas;
A sensor for sensing cavitation of the pump; And
And a controller for changing a preset maintenance period through the cavitation measured from the sensor to reset the maintenance period,
Wherein,
And stops driving the pump when the driving time of the pump and the error range of the maintenance period are 2 to 4%. 8. The apparatus of claim 7,
A first flow line for supplying fluid to the pump; And
And a second flow line for discharging fluid from the pump,
The sensor includes:
A first sensor provided in the first flow line for measuring pressure or temperature of fluid supplied to the pump; And
And a second sensor provided in the first flow line for measuring a temperature of fluid discharged from the pump. 9. The apparatus according to claim 8,
A time calculating unit for calculating a time lapse of cavitation through the value of the pressure or temperature of the fluid measured by the first sensor;
And a number calculator for calculating the number of cavitation occurrences through a signal received from the first sensor,
Wherein the controller calculates the maintenance acceleration / deceleration time based on the cavitation elapsed time and the number of cavitation occurrences and sets the maintenance period. 8. The method of claim 7,
Further comprising an alarm unit for alerting the operator when the operating time of the pump and the error range of the maintenance period are 5 to 8. A method for managing a pump in a liquefied gas processing system driven through a pump management apparatus,
Driving the liquefied gas processing system;
Counting cavitation occurring in the pump;
Resetting a predetermined maintenance period of the pump;
Stopping the operation of the liquefied gas processing system when an error range between the driving time of the pump and the reset maintenance period is within 2 to 4%;
And performing maintenance of the pump. 12. The method of claim 11,
Further comprising an alarm unit for alerting the operator when the operating time of the pump and the error range of the reset maintenance period are 5 to 8%. 13. The method of claim 12, wherein stopping the operation of the liquefied gas processing system comprises:
Stopping the driving of the pump; And
Further comprising the step of operating the alarm unit.

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