CN115750311A - Control method for energy conservation of seawater pump - Google Patents
Control method for energy conservation of seawater pump Download PDFInfo
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- CN115750311A CN115750311A CN202211234047.5A CN202211234047A CN115750311A CN 115750311 A CN115750311 A CN 115750311A CN 202211234047 A CN202211234047 A CN 202211234047A CN 115750311 A CN115750311 A CN 115750311A
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Abstract
The invention discloses a control method for energy conservation of a seawater pump, which comprises the following steps: obtaining the temperature of a fresh water cooling outlet; the temperature of the fresh water cooling outlet is used as an adjusting signal to control a temperature control valve and a seawater pump frequency converter; judging whether the temperature of the fresh water cooling outlet is greater than a preset value, firstly controlling a temperature control valve to be opened, then controlling a sea water pump frequency converter to increase the rotating speed of the sea water pump, and enabling the adjustment priority of the temperature control valve to be higher than that of the sea water pump frequency converter; and judging whether the temperature of the fresh water cooling outlet is not greater than a preset value, and when the temperature of the fresh water cooling outlet is not greater than the preset value, firstly controlling the frequency converter of the sea water pump to reduce the rotating speed of the sea water pump, and then controlling the temperature control valve to close the valve position, wherein the adjustment priority of the sea water pump is higher than that of the temperature control valve. The rotation speed of the seawater pump and the opening degree of the temperature control valve can be controlled according to the actually required cold quantity by collecting the temperature of the fresh water cooling outlet. During the regulation of sea water pump rotational speed and temperature control valve opening, preferentially reduce sea water pump rotational speed to accomplish the mesh that reduces sea water pump electric energy consumption.
Description
Technical Field
The invention relates to the technical field of water pump control, in particular to a control method for energy conservation of a seawater pump.
Background
A water pump is a mechanical device used primarily to transport liquids. The marine cooling system on the ship has an external circulating seawater cycle and an internal circulating fresh water cycle, the fresh water is directly used for cooling the host and the generator set, the seawater cycle is used for cooling the fresh water cycle, the circulation amount of the seawater is large, and the electric energy consumption of a corresponding seawater pump is also large. In view of the above, we propose a control method for energy saving of the seawater pump to solve the above problems.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a method for controlling energy saving of a seawater pump, which can automatically adjust a seawater pump and a temperature control valve to an optimal state according to an actual load of a cooling device such as a main engine on a ship, thereby saving energy and reducing consumption.
In order to achieve the purpose, the invention adopts the following technical scheme: a control method for sea water pump energy saving, comprising:
obtaining the temperature of a fresh water cooling outlet;
the temperature of the fresh water cooling outlet is used as an adjusting signal to control a temperature control valve and a seawater pump frequency converter;
judging whether the temperature of the fresh water cooling outlet is greater than a preset value, and when the temperature of the fresh water cooling outlet is greater than the preset value, firstly controlling a temperature control valve to be opened, then controlling a sea water pump frequency converter to increase the rotating speed of a sea water pump, wherein the adjustment priority of the temperature control valve is higher than that of the sea water pump frequency converter;
or judging whether the temperature of the fresh water cooling outlet is not greater than a preset value, and when the temperature of the fresh water cooling outlet is not greater than the preset value, firstly controlling the sea water pump frequency converter to reduce the rotating speed of the sea water pump, and then controlling the temperature control valve to close the valve position, wherein the adjustment priority of the sea water pump frequency converter is higher than that of the temperature control valve.
Further, the outlet temperature of the seawater pump is obtained, and when the outlet temperature of the seawater pump is higher than 46 ℃, the rotating speed of the seawater pump is increased to the rated rotating speed for operation.
And further, the method also comprises the steps of protecting the operation of the sea water pump, acquiring the continuous operation time of the sea water pump, judging whether the operation time exceeds the preset time, and executing the operation of reducing to the fixed frequency for a set time length when the operation time of the sea water pump exceeds the preset time, wherein the continuous operation time is two adjacent fixed frequency operation time intervals.
Further, the total flow of the seawater circulation is obtained, and the total flow of the seawater circulation and the temperature of a fresh water cooling outlet are taken as references;
the total flow of seawater circulation and the temperature of a fresh water cooling outlet are kept unchanged, and the operation rotating speed with the best efficiency of each pump in the seawater pump set is adjusted.
Furthermore, the method for adjusting the seawater pump set comprises the steps that seawater pumps with the same specification balance the flow of each pump; the starting and stopping sequence of the seawater pumps is preset, and the running number of the current seawater pumps is adjusted according to the starting and stopping sequence.
Further, the adjusting the number of current seawater pumps includes: increasing the operation of the seawater pumps according to the start-stop sequence on the basis of the number of the currently operated seawater pumps; or stopping the operation of the seawater pump from the currently operating seawater pump.
Further, the situation that the sea water pumps are added to operate according to the start-stop sequence on the basis of the number of the sea water pumps which are operated at present comprises the following steps: and when the rotating speed of the currently running seawater pump is judged to be at the rated rotating speed and run for a preset time, increasing the running of the seawater pumps with preset number, and balancing the flow of each pump after adjustment.
Further, the case of stopping the operation of the sea water pump from the currently operated sea water pump includes: when the rotating speed of each current sea water pump is lower than the preset rotating speed, the operation of the sea water pumps with the preset number is stopped according to the starting and stopping sequence, and the flow of each pump after adjustment is balanced.
Compared with the prior art, the invention has the beneficial effects that:
1. the rotation speed of the seawater pump and the opening degree of the temperature control valve can be controlled according to the actually required cold quantity by collecting the temperature of the fresh water cooling outlet.
2. During the regulation of sea water pump rotational speed and temperature control valve opening, preferentially reduce sea water pump rotational speed to accomplish the mesh that reduces sea water pump electric energy consumption.
3. According to fresh water cooling outlet temperature coordinated control sea water pump and temperature-sensing valve effectively improve automatic control degree, reduce the manual control and drop into, reduce the labour and drop into, improve automatic control rate.
4. When a plurality of groups of seawater pumps run, the balance of the multi-pump group during running can be optimized by balancing the rotating speed of each pump.
5. When the seawater pump operates, the pump is controlled to operate at the optimal efficiency rotating speed, the electric energy conversion efficiency can be maximized, and the use efficiency of electric energy is improved.
Drawings
FIG. 1 is a flow chart of the control method for energy saving of a seawater pump according to the present invention;
FIG. 2 is a schematic structural diagram of the control method for energy saving of the seawater pump according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The first embodiment is as follows:
a control method for energy saving of a seawater pump is disclosed, as shown in figure 2, a temperature sensor for monitoring the cooling temperature of fresh water is arranged at the outlet of a heat exchanger on a fresh water circulating loop and is used for acquiring the temperature of the cooling outlet of the fresh water; a temperature control valve for controlling the flow of seawater in the seawater main pipe is arranged on a pipeline for seawater circulation, and the temperature of the fresh water cooling outlet is controlled by controlling the flow of a seawater cold source through the temperature control valve; when the device is used, the fresh water cooling outlet temperature, the opening degree of the temperature control valve and the sea water pump frequency converter are subjected to linkage control, and the opening degree of the temperature control valve and the sea water pump frequency converter are controlled by taking the fresh water cooling outlet temperature as an adjusting signal;
the control logic flow is as shown in fig. 1, comparing the obtained temperature of the fresh water cooling outlet with a preset value, and judging whether the temperature of the fresh water cooling outlet is greater than the preset value, when the temperature of the fresh water cooling outlet is greater than the preset value, namely the fresh water cooling temperature does not reach the standard, the cooling capacity needs to be increased, when in specific control, firstly, the temperature control valve is controlled to be gradually opened, and the temperature change of the fresh water cooling outlet is observed until the temperature control valve is fully opened, and the process does not relate to the frequency conversion control of a sea water pump, so that the priority of adjusting the temperature control valve is higher than that of adjusting a frequency converter of the sea water pump; so can be preferred to improve the flow of sea water cold source, if aforementioned control mode became invalid, temperature detect valve had opened to the biggest, and fresh water cooling outlet temperature still is in the high-order, can further control the converter of sea water pump this moment, improves sea water pump rotational speed through the control of sea water pump converter, thereby can further improve the flow of sea water cold source and can provide more cold sources after improving sea water pump's rotational speed.
On the contrary, whether the temperature of the fresh water cooling outlet is not greater than the preset value is judged according to the comparison between the obtained temperature of the fresh water cooling outlet and the preset value, when the temperature of the fresh water cooling outlet is not greater than the preset value, namely the temperature of the fresh water backwater is at a low level, it can be understood that a host and a generator on the ship both have temperature ranges suitable for operation, the host is easily damaged by high-temperature operation of the host, and the energy waste is indirectly caused by cold source waste due to low-temperature operation of the host, so that when the temperature of the fresh water backwater is lower, the rotating speed of the sea water pump can be reduced or the opening of the temperature control valve can be reduced, compared with the prior art, the rotating speed of the sea water pump can be reduced by preferentially reducing the electric quantity consumption of the sea water pump so as to save energy, at the moment, the adjustment priority of the sea water pump is higher than the adjustment of the temperature control valve, when the fresh water backwater temperature is at a low level, the sea water frequency converter can be preferentially controlled to reduce the rotating speed of the sea water pump, and then the opening of the temperature control valve is gradually reduced; however, the rotation speed of the sea water pump cannot be reduced without limit, and the pump body may be damaged when the rotation speed of the water pump is reduced for a long time and deviates from a normal operation interval, so that the minimum value of the reduction frequency of the sea water pump should be set, the lowest frequency of the sea water pump can be set to be 30% of the highest frequency, and the rotation speed of the sea water pump is not reduced when the rotation speed of the sea water pump is reduced to 30%.
The second embodiment:
as shown in fig. 2, a temperature sensor for measuring the temperature of the seawater may be further disposed in the seawater circulation loop, i.e., at the outlet of the seawater pump, for obtaining the outlet temperature of the seawater pump, i.e., the temperature of the seawater, as shown in fig. 1, when it is detected that the outlet temperature of the seawater pump is greater than 46 ℃, i.e., the temperature of the seawater serving as a cold source is high, which easily causes a reduction in the cooling effect of the fresh water, and at this time, the rotation speed of the seawater pump may be increased to a rated rotation speed to accelerate the circulation of the seawater cold source to increase the cooling effect.
Example three:
the sea water pumps are easy to influence when running under high load for a long time, the embodiment can be used as a program for performing protective running on the sea water pumps running for a long time, specifically, when a plurality of sea water pumps run simultaneously, a staggered time frequency reduction mode can be adopted to enable each sea water pump to be in turn stopped for a certain time, the sea water pumps are enabled to reduce a certain frequency in turn and reduce load running for a certain time so as to achieve the purpose of protecting the sea water pumps, the running time of each sea water pump is respectively accumulated, when the full-load running time of one of the sea water pumps exceeds the set time, for example, running exceeds 24h, the frequency of the pump is gradually reduced to 50-70% of the highest frequency to run for 1-2h, and the sea water pumps can be in turn frequency reduction. And acquiring the continuous operation time of the seawater pump as two adjacent fixed-frequency operation time intervals.
Example four:
the embodiment is used for solving the problem of the operation state with uneven flow, specifically, the total flow of seawater circulation needs to be obtained, a seawater flow meter can be arranged on a seawater main pipe, the total flow of seawater circulation is the sum of the flows of all seawater pumps, so that the flow meters can be respectively arranged on outlet pipes of all seawater pumps, and the total flow of seawater circulation and the temperature of a fresh water cooling outlet are taken as references; and on the premise of maintaining the total flow of seawater circulation and the temperature of the fresh water cooling outlet unchanged, the operation rotating speed with the best efficiency of each pump in the seawater pump set is further adjusted.
The mode of adjusting the seawater pump set comprises that the seawater pumps with the same specification balance the flow of each pump; the method comprises the steps of firstly balancing the flow of each pump by balancing the rotating speed of each seawater pump, enabling each pump to operate in a performance interval with relatively high efficiency, starting or stopping one or more seawater pumps along with balanced increase or decrease of the power of each pump, presetting the starting and stopping sequence of the seawater pumps, and adjusting the operation number of the current seawater pumps according to the starting and stopping sequence.
Specifically, when the balanced lifting power of each pump reaches a certain value and is enough to increase and start one seawater pump, or the running power of each pump is already at the rated power, the corresponding seawater pumps are started according to the starting sequence, and then the power of each pump is balanced again to reach the optimal power interval.
Conversely, when the power of each pump is reduced to the lowest rotating speed in a balanced manner or the condition that one seawater pump can be stopped is met, the operation of one seawater pump is stopped according to the starting and stopping sequence, and the flow of each pump after adjustment is balanced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method of controlling energy conservation for a seawater pump, comprising:
obtaining the temperature of a fresh water cooling outlet;
the temperature of the fresh water cooling outlet is used as an adjusting signal to control a temperature control valve and a seawater pump frequency converter;
judging whether the temperature of the fresh water cooling outlet is greater than a preset value, and when the temperature of the fresh water cooling outlet is greater than the preset value, firstly controlling a temperature control valve to be opened, then controlling a sea water pump frequency converter to increase the rotating speed of a sea water pump, wherein the priority of adjusting the temperature control valve is higher than that of adjusting the sea water pump frequency converter;
or judging whether the temperature of the fresh water cooling outlet is not greater than a preset value, and when the temperature of the fresh water cooling outlet is not greater than the preset value, firstly controlling the sea water pump frequency converter to reduce the rotating speed of the sea water pump, and then controlling the temperature control valve to close the valve position, wherein the adjustment priority of the sea water pump frequency converter is higher than that of the temperature control valve.
2. The control method for the energy saving of the seawater pump as claimed in claim 1, wherein the outlet temperature of the seawater pump is obtained, and when the outlet temperature of the seawater pump is higher than 46 ℃, the rotation speed of the seawater pump is increased to the rated rotation speed for operation.
3. The method for controlling the energy conservation of the seawater pump as claimed in claim 2, further comprising protecting the operation of the seawater pump, obtaining the continuous operation time of the seawater pump, determining whether the operation time exceeds a predetermined time, and when the operation time of the seawater pump exceeds the predetermined time, performing the operation of reducing to the fixed-frequency operation for a set time length, wherein the continuous operation time is two adjacent fixed-frequency operation time intervals.
4. The control method for the energy saving of the seawater pump as claimed in claim 1, wherein the total flow of the seawater circulation is obtained by taking the total flow of the seawater circulation and the temperature of the fresh water cooling outlet as reference;
the total flow of seawater circulation and the temperature of a fresh water cooling outlet are kept unchanged, and the operation rotating speed with the best efficiency of each pump in the seawater pump set is adjusted.
5. The method as claimed in claim 4, wherein the adjusting of the seawater pump set comprises equalizing the pump flow of seawater pumps with the same specification; presetting a starting and stopping sequence of the seawater pumps, and adjusting the running number of the current seawater pumps according to the starting and stopping sequence.
6. The control method for seawater pump energy saving of claim 5, wherein the adjusting the current number of seawater pumps in operation comprises: increasing the operation of the seawater pumps according to the start-stop sequence on the basis of the number of the currently operated seawater pumps; or stopping the operation of the seawater pump from the currently operating seawater pump.
7. The method as claimed in claim 6, wherein the step of increasing the operation of the seawater pumps in the start-stop order based on the number of currently operating seawater pumps comprises: and when the rotating speed of the currently running seawater pump is judged to be at the rated rotating speed and run for a preset time, increasing the running of the seawater pumps with preset number, and balancing the flow of each pump after adjustment.
8. The control method for sea water pump energy saving according to claim 6, wherein the case of stopping the operation of the sea water pump from the currently operated sea water pump includes: when the rotating speed of each current sea water pump is lower than the preset rotating speed, the operation of the sea water pumps with the preset number is stopped according to the starting and stopping sequence, and the flow of each pump after adjustment is balanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211234047.5A CN115750311A (en) | 2022-10-10 | 2022-10-10 | Control method for energy conservation of seawater pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211234047.5A CN115750311A (en) | 2022-10-10 | 2022-10-10 | Control method for energy conservation of seawater pump |
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| Publication Number | Publication Date |
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| CN115750311A true CN115750311A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211234047.5A Pending CN115750311A (en) | 2022-10-10 | 2022-10-10 | Control method for energy conservation of seawater pump |
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| CN (1) | CN115750311A (en) |
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2022
- 2022-10-10 CN CN202211234047.5A patent/CN115750311A/en active Pending
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