KR20100084032A - Automatic control of net-positive suction head of ballast pump during automatic ballast water exchange - Google Patents

Automatic control of net-positive suction head of ballast pump during automatic ballast water exchange Download PDF

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KR20100084032A
KR20100084032A KR1020090003422A KR20090003422A KR20100084032A KR 20100084032 A KR20100084032 A KR 20100084032A KR 1020090003422 A KR1020090003422 A KR 1020090003422A KR 20090003422 A KR20090003422 A KR 20090003422A KR 20100084032 A KR20100084032 A KR 20100084032A
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pump
net
suction head
positive suction
ballast
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KR1020090003422A
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KR101001774B1 (en
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한기훈
정길주
이태진
안용희
김양규
박기용
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현대중공업 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
    • B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/48—Arrangements of indicating or measuring devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Health & Medical Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

PURPOSE: An automatic method for controlling the net-positive suction head of a ballast pump during automatic ballast water replacement is provided to protect a pump, reduce operation costs, and operation times by operating the pump over request net-positive suction head. CONSTITUTION: An automatic method for controlling the net-positive suction head of a ballast pump during automatic ballast water replacement comprises following steps. Necessary request net-positive suction head is calculated based on presumed flow rate. Effective net-positive suction head is calculated from the suction pressure of the pump and the measured flow rate. The request net-positive suction head and the effective net-positive suction head are compared. If the effective net-positive suction head is greater than the request net-positive suction head, the operation of the pump lasts. If the effective net-positive suction head approaches to the request net-positive suction head below fixed range, a pump outlet valve is controlled.

Description

발라스트수 자동교환시 발라스트 펌프의 순흡입양정 자동조절 방법{Automatic control of net-positive suction head of ballast pump during automatic ballast water exchange}Automatic control of net-positive suction head of ballast pump during automatic ballast water exchange}

본 발명은 발라스트 펌프 제어 방법에 관한 것으로, 다욱 상세하게는 발라스트수 자동교환 또는 발라스트 펌프 운전시 계단제어방식을 사용하여 밸브를 제어하도록 함으로써 순간적인 압력변화에 밸브가 민감하게 움직이는 것을 방지하고, 일정영역의 안전구간을 설정하고 안전구간을 하회하는 경우 펌프를 정지시키는 안전기능을 추가함으로써 펌프 운전중 흡입 압력저하에 의해 생기는 캐비테이션을 방지할 수 있도록 하는 발라스트수 자동교환시 발라스트 펌프의 순흡입양정 자동조절 방법에 관한 것이다. The present invention relates to a ballast pump control method, and more particularly, to control the valve by using a step control method during automatic ballast water exchange or ballast pump operation, thereby preventing the valve from moving sensitively to instantaneous pressure changes, and By setting the safety section of the area and adding a safety function that stops the pump when it falls below the safety section, the net suction lift of the ballast pump automatically when the ballast water is automatically replaced to prevent the cavitation caused by the suction pressure drop during pump operation. It is about a control method.

종래의 발라스트 펌프 운전시 순흡입양정은 자동 연속제어의 대상이 아니고, 펌프제조사에서 제공하는 요구 순흡입양정보다 높은 상태를 유지하면서 운전되도록 운전자에 의해 수동 조절되거나, 일정 양정이하에서 트립(trip)시키는 기능을 구비 하여 운전되고 있다. In conventional ballast pump operation, the net suction lift is not subject to automatic continuous control, but is manually adjusted by the driver to operate while maintaining a higher state than the required net suction lift information provided by the pump manufacturer, or trips below a certain lift. It is operated with the function to make it.

기존의 선박에서 디발라스팅 운전은 발라스트 탱크에 발라스트수를 배출시키기 위한 발라스트 펌프와, 발라스트 펌프의 배출량을 조절하는 밸브로 구성되며, 발라스트 펌프 흡입측에 제 1 압력계(P_1)와, 발라스트 펌프와 조절밸브 사이에 제 2 압력계(P_2)를 두고, 제 1 압력계(P_1)의 값이 성능곡선상의 일정값을 하회하지 않도록 수동으로 밸브를 조절하여 운전하여 왔다. In the existing ship, the deballasting operation consists of a ballast pump for discharging ballast water to the ballast tank, a valve for controlling the discharge of the ballast pump, and a first pressure gauge (P_1) and a ballast pump on the suction side of the ballast pump. The second pressure gauge P_2 is provided between the control valves, and the valve is manually operated so that the value of the first pressure gauge P_1 does not fall below a certain value on the performance curve.

이로 인하여, 디발라스팅 시간이 과다하게 소요되거나, 펌프의 캐비테이션이 발생할 가능성이 있는 문제점이 있었다. Due to this, there is a problem that the debalasting time is excessively consumed or the cavitation of the pump may occur.

또한, 통상적으로 사용하는 PID 제어방식을 적용할 수 있으나, PID 제어를 발라스트 펌프의 순흡입양정 제어에 적용할 경우 펌프 유량에 따라서 압력 설정치가 변화해야 하므로 적용이 어렵고, 제어 과정에서 순흡입양정이하로 운전되는 구간이 발생할 수 있어 펌프 손상이 초래될 수 있다. In addition, it is possible to apply the conventional PID control method, but when PID control is applied to the net suction lift control of the ballast pump, it is difficult to apply because the pressure set value must be changed according to the pump flow rate, and the net suction lift is lower than the control step. May occur, causing damage to the pump.

본 발명은 이와 같은 종래의 제반 문제점을 해소하기 위하여 안출한 것으로, 펌프 성능곡선을 이용해서 유량을 추정하고, 종전에 설치된 제 1 압력계(P_1)와 제 2 압력계(P_2)로부터 펌프의 통과유량을 추산하고, 추산된 유량에 대응하는 NPSHr(요구순흡입양정)을 하회하지 않도록 추정된 유량에 근거하여 현재의 유효 순흡입양정을 계산하여 추정된 유효 흡입양정이 요구 순흡입양정을 상회하는 안전범위에서 운전될 수 있도록 펌프제어 밸브를 자동으로 조절하는 계단제어방법을 사용하여 밸브를 자동으로 조절함으로써 순간적인 압력변화에 밸브가 민감하게 움직이는 것을 방지하고, 일정영역의 안전구간을 설정하고 안전구간을 하회하는 경우 펌프를 정지시키는 안전기능을 추가함으로써 펌프 운전중 압력저하에 의해 발생하는 캐비테이션을 방지할 수 있도록 하는 발라스트수 자동교환시 발라스트 펌프의 순흡입양정 자동조절 방법을 제공하는데 그 목적이 있다. The present invention has been devised to solve such a conventional problem, and the flow rate is estimated using the pump performance curve, and the flow rate of the pump from the previously installed first pressure gauge P_1 and second pressure gauge P_2 is determined. Calculates the current effective net suction head based on the estimated flow rate so that it is estimated and not below NPSHr (corresponding net suction lift) corresponding to the estimated flow rate, and the estimated effective suction lift exceeds the required net suction head. Automatically adjusts the valve using a step control method that automatically adjusts the pump control valve so that it can be operated at By adding a safety function to stop the pump when it is under, the cavitation caused by the pressure drop during pump operation can be prevented. The purpose of the present invention is to provide a method for automatically adjusting the net suction lift of a ballast pump during automatic ballast water exchange.

상기 목적달성을 위한 본 발명은 펌프 제조업체로부터 받은 펌프의 유량-전양정 성능곡선 자료와 측정된 펌프의 전양정으로부터 유량을 추정하고, 추정된 유량에 근거하여 필요한 요구순흡입양정을 계산하는 단계(S1); 추정된 유량과 측정된 펌프흡입 압력으로 부터 유효순흡입양정을 계산하는 단계(S2); 상기 S1 단계에서 계산된 요구순흡입양정과 S2 단계에서 측정된 유효순흡입양정을 비교하는 단 계(S3); S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정보다 일정량 이상 큰 경우 펌프의 운전을 지속시키고, S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정에 일정범위이하로 근접한 경우 펌프 토출 밸브를 조절하는 단계(S4); S3 단계의 비교값이 S4 단계의 조절이 유효하지 못하여 S4 단계보다 더욱 근접한 경우 펌프를 정지시키는 단계 (S5); S1부터 S5 까지의 단계를 다시 반복하는 단계(S6);로 이루어진 것을 특징으로 한다. In order to achieve the above object, the present invention provides a method for estimating the required flow rate based on the estimated flow rate and the total pump head-performance curve data of the pump received from the pump manufacturer, and calculating the required net suction head based on the estimated flow rate ( S1); Calculating an effective net suction head from the estimated flow rate and the measured pump suction pressure (S2); Comparing the required net suction lift calculated in step S1 with the effective net suction lift measured in step S2 (S3); If the effective net suction lift of step S2 is larger than the required net suction lift information of step S1, the pump operation is continued.If the effective net suction lift of step S2 is close to the required net suction lift of step S1, below the predetermined range, the pump discharge valve Adjusting (S4); Stopping the pump when the comparison value of the step S3 is closer than the step S4 because the adjustment of the step S4 is not valid (S5); It characterized by consisting of; step (S6) to repeat the steps from S1 to S5 again.

이상에서 설명한 바와 같이 본 발명에 의하면, 기존의 펌프의 흡입압력값을 감시하면서 일정값을 하회하지 않도록 수동으로 밸브를 조절하여 운전함으로써 과다한 시간이 걸리며 펌프의 캐비테이션이 발생할 수 있는 것과는 달리, 유효 흡입양정의 안전범위를 계산하고 안전범위 안에서 운전될 수 있도록 하는 펌프제어 밸브를 자동으로 조절하는 계단제어방법을 적용함으로써 펌프의 운전이 항상 유량에 따라서 변화하는 요구순흡입양정이상에서 펌프를 운전할 수 있으므로 운전비 절감, 운전시간 단축, 펌프보호의 세가지 목적을 달성할 수 있는 매우 유용한 발명인 것이다. As described above, according to the present invention, it is necessary to adjust the valve manually so as not to be lower than a certain value while monitoring the suction pressure value of the existing pump. By applying the step control method that calculates the safety range of the head and automatically adjusts the pump control valve so that it can be operated within the safety range, the pump can be operated above the required net suction lift that always changes according to the flow rate. It is a very useful invention that can achieve the three purposes of operating cost reduction, operation time reduction, pump protection.

이하, 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시 예를 상세히 설명하면 다음과 같다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

펌프 제조업체로부터 받은 펌프의 유량-전양정 성능곡선 자료와 측정된 펌프의 전양정으로부터 유량을 추정하고, 추정된 유량에 근거하여 필요한 요구순흡입양정을 계산하는 단계(S1); 추정된 유량과 측정된 펌프흡입 압력으로 부터 유효순흡입양정을 계산하는 단계(S2); 상기 S1 단계에서 계산된 요구순흡입양정과 S2 단계에서 측정된 유효순흡입양정을 비교하는 단계(S3); S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정보다 일정량 이상 큰 경우 펌프의 운전을 지속시키고, S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정에 일정범위이하로 근접한 경우 펌프 토출 밸브를 조절하는 단계(S4); S3 단계의 비교값이 S4 단계의 조절이 유효하지 못하여 S4 단계보다 더욱 근접한 경우 펌프를 정지시키는 단계 (S5); S1부터 S5 까지의 단계를 다시 반복하는 단계(S6);로 이루어진 것을 특징으로 한다.Estimating the flow rate from the flow rate-head lift performance curve data of the pump received from the pump manufacturer and the measured total head of the pump, and calculating a required net suction head based on the estimated flow rate (S1); Calculating an effective net suction head from the estimated flow rate and the measured pump suction pressure (S2); Comparing the required net suction lift calculated in step S1 with the effective net suction lift measured in step S2 (S3); If the effective net suction lift of step S2 is larger than the required net suction lift information of step S1, the pump operation is continued.If the effective net suction lift of step S2 is close to the required net suction lift of step S1, below the predetermined range, the pump discharge valve Adjusting (S4); Stopping the pump when the comparison value of the step S3 is closer than the step S4 because the adjustment of the step S4 is not valid (S5); It characterized by consisting of; step (S6) to repeat the steps from S1 to S5 again.

표 1 은 유량과 펌프 전양정 값을 성능곡선으로부터 추정한 데이터값이고, 수학식 1 은 표 1 의 데이터로부터 밸브 제어를 위한 안전범위를 계산하는 수식을 예로 나타낸 것이다. Table 1 is a data value estimated from the performance curve of the flow rate and the pump total head value, Equation 1 shows an example of calculating the safety range for the valve control from the data in Table 1.

FlowrateFlowrate Total HeadTotal head Total HeadTotal head m3/hrm 3 / hr m H2Om H 2 O kgf/cm2 gkg f / cm 2 g 7.4 7.4 51.138 51.138 4.081 4.081 412.9 412.9 50.031 50.031 3.970 3.970 619.4 619.4 49.385 49.385 3.905 3.905 807.4 807.4 48.738 48.738 3.841 3.841 1205.5 1205.5 46.708 46.708 3.638 3.638 1607.4 1607.4 44.031 44.031 3.370 3.370 2001.8 2001.8 41.538 41.538 3.121 3.121 2400.0 2400.0 38.400 38.400 2.807 2.807 2565.9 2565.9 36.831 36.831 2.650 2.650 2794.5 2794.5 34.615 34.615 2.428 2.428 2964.1 2964.1 32.769 32.769 2.244 2.244 3200.0 3200.0 30.000 30.000 1.967 1.967 3594.5 3594.5 24.277 24.277 1.394 1.394 3966.8 3966.8 16.523 16.523 0.619 0.619

Figure 112009002727719-PAT00001
Figure 112009002727719-PAT00001

상기 수식은 펌프 흡입부 제어(control) 목표압력(NPSHr로부터 여유를 반영하여 회귀 분석)을 계산하는 것으로, NPSH 여유 2.0 [m H2O] 반영하였다. The above formula is to calculate the pump inlet control target pressure (regression analysis reflecting the margin from NPSHr), reflecting the NPSH margin 2.0 [m H 2 O].

상기 표와 수식에 의해 계산된 값을 S2 단계에서 측정된 펌프 흡입압력과 비교하면서 발라스트 펌프의 운전을 실행한다. The ballast pump is operated while comparing the values calculated by the above table and formula with the pump suction pressure measured in step S2.

상기 두 가지 값(펌프흡입압력과 제어목표값)을 지속적으로 비교하며 발라스트 펌프의 운전을 지속하면서 S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정보다 일정 범위 이상 큰 경우 펌프의 운전을 지속시키고, S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정에 일정범위 이하로 근접한 경우 밸브의 궤도를 닫는 방향으로 일정량 조절하여 펌프통과 유량을 감소시킴으로써 요구순흡입양정값 을 낮추고 유효순흡입양정값을 증가시켜 펌프를 안전범위내에서 운전되도록 한다. 또한, 상기 단계의 조절이 유효하지 못하거나, 다른 원인에의해서, 유효순흡입양정이 요구순흡입양정 보다 일정범위 이하로 근접한 경우, 펌프를 정지하도록 하여 펌프를 안전범위내에서 운전할 수 있도록 한다. Continuously compares the two values (pump suction pressure and control target value) and continues the operation of the ballast pump while continuing the operation of the pump if the effective net suction volume in step S2 is greater than the required net suction volume in step S1. If the effective net suction lift in step S2 is close to the required net suction lift in the step S1 below a certain range, by adjusting a certain amount in the direction of closing the track of the valve, the flow rate of the pump is reduced to lower the required net suction lift value and the effective net suction lift value. Increase the pump to keep the pump within safe range. In addition, when the adjustment of the above step is not effective or due to other causes, the effective net suction lift is closer to a predetermined range or less than the required net suction lift, the pump can be stopped to operate the pump within the safe range.

상기와 같이 발라스트 펌프의 밸브를 조절하여 펌프의 운전을 지속 또는 정지시킴으로써 순흡입양정의 곡선이 계단형식을 나타내도록 하는 계단제어방식을 사용하여 제어하는 것이다. As described above, by controlling the valve of the ballast pump to control the operation of the pump by using a step control method such that the curve of the net suction lift shows a step shape.

표 2 는 유량과 NPSHr의 관계를 성능곡선으로부터 계산한 표이고, 수학식 2 는 그 데이터로부터 펌프정지 압력값을 계산하는 계산 수식을 나타낸 것이다. Table 2 is a table in which the relationship between the flow rate and the NPSHr is calculated from the performance curve, and Equation 2 shows a calculation formula for calculating the pump stop pressure value from the data.

FlowrateFlowrate NPSHrNPSHr 비고Remarks m3/hrm 3 / hr m H2Om H 2 O 00 1.41.4 추정calculation 800800 1.4476 1.4476 성능곡선으로부터 재계산Recalculate from Performance Curve 10001000 1.5673 1.5673 성능곡선으로부터 재계산Recalculate from Performance Curve 15001500 1.9667 1.9667 성능곡선으로부터 재계산Recalculate from Performance Curve 20002000 2.4581 2.4581 성능곡선으로부터 재계산Recalculate from Performance Curve 25002500 3.1403 3.1403 성능곡선으로부터 재계산Recalculate from Performance Curve 30003000 4.0041 4.0041 성능곡선으로부터 재계산Recalculate from Performance Curve 35003500 5.0115 5.0115 성능곡선으로부터 재계산Recalculate from Performance Curve

Figure 112009002727719-PAT00002
Figure 112009002727719-PAT00002

상기 수학식은 펌프정지(trip) 압력(NPSHr로부터 여유를 반영하여 회귀 분석)을 게산하는 것으로 NPSH 여유 0.5 [m H2O] 반영하였다. The above equation was calculated by calculating the pump trip pressure (regression analysis reflecting the margin from NPSHr) to reflect the NPSH margin 0.5 [m H 2 O].

발라스트 펌프의 성능곡선의 예를 도 3 에 나타내었다. 성능곡선은 유량 800~4000[m3/hr]의 범위에 대해 제시되어 있으며, 800[m3/hr] 이하에 대한 NPSHr은 추정된 값(유량 0 m3/hr 에서 NPSHr = 1.4 [mH2O])을 적용하였다. An example of the performance curve of the ballast pump is shown in FIG. 3. Performance curves are presented for a range of flow rates from 800 to 4000 [m 3 / hr], and NPSHr for 800 [m 3 / hr] and below is estimated value (NPSHr = 1.4 [mH 2 at flow rate 0 m 3 / hr]. O]) was applied.

순흡입양정(NPSH, Net Positive suction Head)은 펌프의 캐비테이션(Cavitation)을 방지하는 조건을 판단하기 위한 지표로 사용되며, 펌프에서 요구되는 NPSH를 NPSHr(NPSH, required), 공정조건에 의해서 계산되는 NPSH를 NPSHa(NPSH, available)로 표시한다. 펌프운전시 캐비테이션을 방지하기 위해서는 항상 유효순흡입양정(NPSHa)이 요구순흡입양정(NPSHr)보다 높은 조건에서 운전해야 하며, 통상적으로 여유를 두고 운전하게 된다. Net positive suction head (NPSH) is used as an indicator to determine the condition to prevent the cavitation of the pump.The NPSH required by the pump is calculated by NPSHr (NPSH, required) and process conditions. NPSH is expressed as NPSHa (NPSH, available). In order to prevent cavitation during pump operation, the effective net suction lift (NPSHa) should always be operated at a higher condition than the required net suction lift (NPSHr).

NPSHr은 펌프 공급업체에서 제공되며, NPSHa는 다음의 식으로 계산된다. NPSHr is provided by the pump supplier, and NPSHa is calculated by the equation

NPSHa = (Static Head at pump suction) + (Velocity Head at pump suction) - (Vapor Pressure Head at fluid temperature) NPSHa = (Static Head at pump suction) + (Velocity Head at pump suction)-(Vapor Pressure Head at fluid temperature)

= Ps + V2 /(2*g) - Pv= Ps + V 2 / (2 * g)-Pv

식에서, Ps는 펌프의 흡입부 압력으로 [mH2O]단위이며, V는 유체의 선속도로 [m/sec] 단위이고, Pv는 유체의 온도에서의 증기압력으로 mH2O이다. g는 중력가속도 상수로 9.8 [m/sec] 이다. Where Ps is the pressure in the inlet of the pump in [mH 2 O], V is the linear velocity of the fluid in [m / sec], and Pv is the vapor pressure at the temperature of the fluid in mH 2 O. g is the gravity acceleration constant of 9.8 [m / sec].

도 4 는 위의 [수학식 1]과 [수학식 2]의 근사식을 적용한 경우에 대한 NPSHa를 나타낸다. Ps,c와 Ps,t로 제어되는 경우 NPSHr에 대한 여유치는 각각 2.0 과 0.5 [mH2O] 이다.Figure 4 shows the NPSHa for the case of applying the approximation formula of [Equation 1] and [Equation 2] above. When controlled by Ps, c and Ps, t the margins for NPSHr are 2.0 and 0.5 [mH 2 O], respectively.

도 5 에서 보면, 발라스트 운전은 Ps,c 곡선 위 영역에서 이루어지며, 만약 펌프흡입 압력이 Ps,t 곡선 이하로 내려가게 되면, 펌프는 정지된다. Ps,0는 캐비테이션이 발생할 수 있는 수두로서, 이 이하의 수두가 되면, 펌프가 손상될 수 있으므로 주의해야 한다.In FIG. 5, the ballast operation is performed in the region above the Ps, c curve, and if the pump suction pressure falls below the Ps, t curve, the pump is stopped. Ps, 0 is the head with which cavitation can occur, and care should be taken when the head is lower than this, since the pump may be damaged.

또한, 도 5 와 같은 그래프를 현재의 유량 및 흡입압력 좌표와 함께 펌프 제어화면에 출력하여, 운전자에게 정보를 제공하는 것이 바람직할 것으로 판단된다.In addition, it is determined that it is desirable to output a graph as shown in FIG. 5 to the pump control screen together with the current flow rate and suction pressure coordinates to provide information to the driver.

도 6 은 유량영역에서 NPSH여유이다. 6 shows NPSH margin in the flow rate region.

그래프에서 보는 바와 같이 NPSHa는 전 흐름영역에서 안정적인 수두 여유를 갖는다.As shown in the graph, NPSHa has a stable head margin in the entire flow region.

상술한 실시 예는 본 발명의 가장 바람직한 예에 대하여 설명한 것이지만, 상기 실시 예에만 한정되는 것은 아니며, 본 발명의 기술사상을 벗어나지 않는 범위 내에서 다양한 변형이 가능하다는 것은 당업자에게 있어서 명백한 것이다. 특히, 이 방법은 발라스트수 자동교환 외에, 통상적인 발라스팅 및 디발라스팅 운전에서 펌프 보호기능을 추가하고자 하는 경우 적용할 수 있다.It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. In particular, this method can be applied in addition to the automatic ballast water exchange, to add the pump protection function in the normal ballasting and deballasting operation.

도 1 은 본 발명인 발라스트수 자동교환시 발라스트 펌프의 순흡입양정 자동조절 방법의 발라스트 펌프 토출밸브 제어 순서도, 1 is a flow chart of the ballast pump discharge valve control method of the automatic adjustment of the net suction lift of the ballast pump at the time of automatic ballast water exchange of the inventors,

도 2 는 본 발명인 발라스트수 자동교환시 발라스트 펌프의 순흡입양정 자동조절 방법의 발라스트 펌프 제어 순서도, 2 is a ballast pump control flow chart of the method for automatically adjusting the net suction lift of the ballast pump at the time of automatic ballast water exchange of the inventors,

도 3 은 발라스트 펌프의 성능곡선, 3 is a performance curve of the ballast pump,

도 4 는 [수학식 1]과 [수학식 2]의 근사식을 적용한 경우에 대한 NPSHa를 나타낸 그래프, Figure 4 is a graph showing the NPSHa for the case of applying the approximation formula of [Equation 1] and [Equation 2],

도 5 는 펌프 흡입 제어압력을 나타낸 그래프, 5 is a graph showing the pump suction control pressure;

도 6 은 NPSH의 여유비교 그래프,6 is a margin comparison graph of NPSH,

Claims (1)

펌프 제조업체로부터 받은 펌프의 유량-전양정 성능곡선 자료와 측정된 펌프의 전양정으로부터 유량을 추정하고, 추정된 유량에 근거하여 필요한 요구순흡입양정을 계산하는 단계(S1); 추정된 유량과 측정된 펌프흡입 압력으로 부터 유효순흡입양정을 계산하는 단계(S2); 상기 S1 단계에서 계산된 요구순흡입양정과 S2 단계에서 측정된 유효순흡입양정을 비교하는 단계(S3); S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정보다 일정량 이상 큰 경우 펌프의 운전을 지속시키고, S2 단계의 유효순흡입양정이 S1 단계의 요구순흡입양정에 일정범위이하로 근접한 경우 펌프 토출 밸브를 조절하는 단계(S4); S3 단계의 비교값이 S4 단계의 조절이 유효하지 못하여 S4 단계보다 더욱 근접한 경우 펌프를 정지시키는 단계 (S5); S1부터 S5 까지의 단계를 다시 반복하는 단계(S6);로 이루어진 것을 특징으로 하는 발라스트수 교환시 발라스트 펌프의 순흡입양정 자동조절 방법.Estimating the flow rate from the flow rate-head lift performance curve data of the pump received from the pump manufacturer and the measured total head of the pump, and calculating a required net suction head based on the estimated flow rate (S1); Calculating an effective net suction head from the estimated flow rate and the measured pump suction pressure (S2); Comparing the required net suction lift calculated in step S1 with the effective net suction lift measured in step S2 (S3); If the effective net suction lift of step S2 is larger than the required net suction lift information of step S1, the pump operation is continued.If the effective net suction lift of step S2 is close to the required net suction lift of step S1, below the predetermined range, the pump discharge valve Adjusting (S4); Stopping the pump when the comparison value of the step S3 is closer than the step S4 because the adjustment of the step S4 is not valid (S5); Step (S6) to repeat the steps from S1 to S5 again; The automatic adjustment of the net suction lift of the ballast pump during ballast water exchange, characterized in that consisting of.
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KR101435644B1 (en) * 2012-09-12 2014-08-29 삼성중공업 주식회사 Ship ballast water treatment device calculating flux from pump pressure
KR20150144021A (en) 2014-06-16 2015-12-24 현대중공업 주식회사 Apparatus for collecting a sample ballast water
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CN111946671A (en) * 2020-08-20 2020-11-17 福建蓝海节能科技有限公司 Method for effectively preventing cavitation of water pump

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KR101435644B1 (en) * 2012-09-12 2014-08-29 삼성중공업 주식회사 Ship ballast water treatment device calculating flux from pump pressure
KR20150144021A (en) 2014-06-16 2015-12-24 현대중공업 주식회사 Apparatus for collecting a sample ballast water
WO2022270680A1 (en) * 2021-06-25 2022-12-29 주식회사 대은계전 Automatic control device utilizing product-specific characteristic curve, and control method using same

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