CN110182911B - Ship ballast water treatment control device and method and ship ballast water treatment system - Google Patents
Ship ballast water treatment control device and method and ship ballast water treatment system Download PDFInfo
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- CN110182911B CN110182911B CN201910528400.2A CN201910528400A CN110182911B CN 110182911 B CN110182911 B CN 110182911B CN 201910528400 A CN201910528400 A CN 201910528400A CN 110182911 B CN110182911 B CN 110182911B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The control unit is used for controlling an electrolysis unit of the ship ballast water treatment system to start working at a rated electrolysis current, calculating a current efficiency correction factor of the electrolysis unit according to detection data of the temperature detection unit, the salinity detection unit, the flow detection unit and the effective chlorine analysis unit, the rated electrolysis current and current efficiency-temperature-salinity relation data of the electrolysis unit, and controlling the electrolysis current of the electrolysis unit according to the rated effective chlorine concentration, the current efficiency correction factor, the current efficiency-temperature-salinity relation data and the detection data of the temperature detection unit, the salinity detection unit and the flow detection unit. The invention can accurately control the effective chlorine adding amount.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a device and a method for controlling ship ballast water treatment and a ship ballast water treatment system.
Background
According to the international maritime organization convention, the ballast water must be treated by the ship and can be discharged after the ballast water reaches the specified D-2 standard. The electrolytic process is one of the mainstream ship ballast water treatment technologies at present, and the working principle of the electrolytic process is that when a ship is loaded with ballast water, all or part of seawater passes through an electrolytic unit and is electrolyzed to generate an effective chlorine solution with a certain concentration. The effective chlorine solution has strong oxidizability and can kill plankton, larva, spore, pathogen and other organisms in seawater. In order to ensure that the treated ballast water quality meets the convention requirement, the effective chlorine dosing concentration must reach a certain value, usually about 5-13ppm, but if the dosing concentration is too high, the energy consumption of equipment is increased, and the corrosion of a cabin is accelerated. Therefore, accurately controlling the effective chlorine dosing concentration in ballast water becomes one of the key technologies of the ballast water management system by the electrolysis method.
The control process of the effective chlorine dosing concentration of the existing ship ballast water treatment system is as follows: gather the ballast water sample in real time from the ballast water main line, carry to effective chlorine analysis appearance through the sample pipeline, effective chlorine analysis appearance survey effective chlorine concentration and transmit to the control unit, the control unit adjusts the electrolytic current according to measuring effective chlorine concentration to effective chlorine concentration is in setting for the interval in the control ballast water main line.
The available chlorine analyzer is mainly divided into a spectrophotometry method and an electrode method, and the existing ballast water treatment system adopts the spectrophotometry method due to the relatively high accuracy and reliability of the spectrophotometry method. The method is characterized in that a certain amount of water sample is taken, an indicating reagent which reacts with available chlorine and develops color is injected into the water sample, and the concentration of the available chlorine in the ballast water is measured based on the absorbance of the developed indicating reagent. The method has long testing time and slow response speed, the effective chlorine concentration in the water after the determination is finished may have changed significantly, and the effective chlorine dosing concentration in the ballast water pipeline cannot be adjusted accurately.
Disclosure of Invention
The invention aims to provide a device and a method for controlling ship ballast water treatment, which can accurately control the effective chlorine concentration.
The invention provides a ship ballast water treatment control device, comprising:
a temperature detection unit for detecting a temperature of ballast water entering an electrolysis unit of the ship ballast water treatment system;
a salinity detection unit for detecting the salinity of the ballast water entering the electrolysis unit;
a flow rate detecting unit for detecting a flow rate of ballast water in a main pipeline of the ship ballast water treatment system;
the available chlorine analysis unit is used for detecting the concentration of available chlorine in the main pipeline;
the control unit is used for controlling the electrolysis unit to start working at a rated electrolysis current; and the system is also used for calculating a current efficiency correction factor of the electrolysis unit according to the detection data of the temperature detection unit, the salinity detection unit, the flow detection unit and the effective chlorine analysis unit, the rated electrolysis current and the current efficiency-temperature-salinity relation data of the electrolysis unit, and controlling the electrolysis current of the electrolysis unit according to the rated effective chlorine concentration, the current efficiency correction factor, the current efficiency-temperature-salinity relation data and the detection data of the temperature detection unit, the salinity detection unit and the flow detection unit.
The temperature detection unit and the salinity detection unit are arranged in a pipeline where the electrolysis unit is located, and the temperature detection unit and the salinity detection unit are located in front of an inlet of the electrolysis unit.
The effective chlorine analysis unit is connected with the main pipeline through a water taking pipeline, an inlet of the water taking pipeline is positioned behind the electrolysis unit, and the flow detection unit is arranged on the main pipeline.
The application also provides a ship ballast water treatment control method, which comprises the following steps:
controlling an electrolysis unit of the ship ballast water treatment system to start working at a rated electrolysis current;
calculating a current efficiency correction factor of the electrolytic unit according to the temperature of ballast water entering the electrolytic unit, the salinity of the ballast water entering the electrolytic unit, the flow rate of the ballast water in a main pipeline of a ship ballast water treatment system, a detected value of the effective chlorine concentration in the main pipeline, the rated electrolytic current and the current efficiency-temperature-salinity relation data of the electrolytic unit;
acquiring detection values of the temperature of ballast water of the electrolytic unit, the salinity of the ballast water entering the electrolytic unit and the flow of the ballast water in a main pipeline in real time;
and controlling the electrolysis current of the electrolysis unit according to the acquired detection value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data.
Wherein the controlling of the electrolysis unit of the ship ballast water treatment system to start operating at a rated electrolysis current includes:
calculating a rated chlorine yield according to the rated effective chlorine concentration and the rated flow, and acquiring rated current efficiency of an electrolysis unit of the ship ballast water treatment system according to rated temperature, rated salinity and current efficiency-temperature-salinity relation data of the electrolysis unit;
calculating the rated electrolytic current of the electrolytic unit according to the rated current efficiency and the rated chlorine yield;
starting the electrolysis unit according to the rated electrolysis current.
Wherein the step of calculating the current efficiency correction factor of the electrolytic unit according to the temperature of the ballast water entering the electrolytic unit, the salinity of the ballast water entering the electrolytic unit, the flow rate of the ballast water in a main pipeline of the ship ballast water treatment system, the detected value of the effective chlorine concentration in the main pipeline, the rated electrolytic current and the current efficiency-temperature-salinity relation data of the electrolytic unit comprises the following steps:
acquiring a first theoretical current efficiency according to the temperature of ballast water entering the electrolytic unit, the salinity detection value of the ballast water entering the electrolytic unit and current efficiency-temperature-salinity relation data of the electrolytic unit, and calculating actual current efficiency according to the flow of the ballast water in a main pipeline, the detection value of the effective chlorine concentration in the main pipeline and the rated electrolytic current;
calculating a current efficiency correction factor for the electrolysis cell from the first theoretical current efficiency and the actual current efficiency.
Wherein the step of controlling the electrolysis current of the electrolysis unit according to the acquired detection value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data comprises the following steps:
acquiring a second theoretical current efficiency according to the temperature of the ballast water entering the electrolytic unit, the salinity detection value of the ballast water entering the electrolytic unit and the current efficiency-temperature-salinity relation data;
calculating actual electrolytic current according to the current efficiency correction factor, the second theoretical current efficiency, the rated effective chlorine concentration and the detected value of the flow of the ballast water in the main pipeline;
and controlling the electrolysis unit to work according to the actual electrolysis current, and returning to the step of acquiring the detected values of the temperature of the ballast water of the electrolysis unit, the salinity of the ballast water entering the electrolysis unit and the flow of the ballast water in the main pipeline in real time.
The present application also provides a ship ballast water treatment system including an electrolysis unit and the ship ballast water treatment control device as described above.
The system comprises an electrolysis pipeline and a main pipeline, wherein an inlet and an outlet of the electrolysis pipeline are respectively communicated with the main pipeline, the electrolysis unit, a temperature detection unit and a salinity detection unit of the ship ballast water treatment control device are arranged in the electrolysis pipeline, the temperature detection unit and the salinity detection unit are positioned in front of the inlet of the electrolysis unit, and an effective chlorine analysis unit of the ship ballast water treatment control device is connected with the main pipeline through a water taking pipeline.
The system comprises an electrolysis unit, a temperature detection unit and a salinity detection unit, wherein the electrolysis unit, the temperature detection unit and the salinity detection unit of the ship ballast water treatment control device are arranged in the main pipeline, the temperature detection unit and the salinity detection unit are positioned in front of an inlet of the electrolysis unit, and an effective chlorine analysis unit of the ship ballast water treatment control device is connected with the main pipeline through a water taking pipeline.
The device and method for controlling ship ballast water treatment and the ship ballast water treatment system of the invention firstly control the electrolysis unit to start working with rated electrolysis current, then, calculating the current efficiency correction factor of the electrolysis unit according to the temperature of the ballast water entering the electrolysis unit, the salinity of the ballast water entering the electrolysis unit, the flow rate of the ballast water in the main pipeline, the detection value and the rated electrolysis current of the effective chlorine concentration in the main pipeline and the relation data of the current efficiency, the temperature and the salinity of the electrolysis unit, real-time acquiring the temperature of the ballast water of the electrolysis unit, the salinity of the ballast water entering the electrolysis unit and the flow rate of the ballast water in the main pipeline, and controlling the electrolytic current of the electrolytic unit according to the acquired detection value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data. According to the invention, by establishing the relation data of current efficiency-temperature-salinity of the electrolysis unit, the monitoring of the concentration of the effective chlorine can be replaced by the temperature, salinity and flow which are easier to measure in real time, so that the real-time adjustment of the electrolysis current is realized, and the dosage of the effective chlorine is further effectively controlled.
Drawings
Fig. 1 is a schematic structural view of a ship ballast water treatment control apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic of current efficiency versus temperature versus salinity data for an electrolysis cell in an embodiment of the present invention.
Fig. 3 is a flowchart illustrating a ship ballast water treatment control method according to a second embodiment of the present invention.
Fig. 4 is a schematic structural view of a ship ballast water treatment system according to a third embodiment of the present invention.
Fig. 5 is a schematic structural view of a ship ballast water treatment system according to a fourth embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.
In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
First embodiment
Fig. 1 is a schematic structural view of a ship ballast water treatment control apparatus according to a first embodiment of the present invention. As shown in fig. 1, the ship ballast water treatment control apparatus of the present embodiment includes a temperature detection unit 12, a salinity detection unit 13, a flow rate detection unit 15, an effective chlorine analysis unit 16, and a control unit 11.
The signal output end of the temperature detection unit 12 is connected with the input end of the control unit 11, the output end of the effective chlorine analysis unit 16 is connected with the input end of the control unit 11, and the flow detection unit 15 is connected with the input end of the control unit 11. In this embodiment, the control unit 11 includes an operation control module and an electrolysis power control module, an input end of the operation control module is connected to the temperature detection unit 12, the salinity detection unit 13, the flow detection unit 15, and the available chlorine analysis unit 16, an output end of the operation control module is connected to an input end of the electrolysis power control module, and an output end of the electrolysis power control module is connected to an electrolysis power of the electrolysis unit.
The effective chlorine solution in the main pipeline of the ballast water treatment system is generated by electrolyzing ballast water through the electrolysis unit, has strong oxidizability, and can kill plankton, larva, spore, pathogen and other organisms in seawater. The temperature detection unit 12 is used for detecting the temperature of ballast water entering an electrolytic unit of the ballast water treatment system, the salinity detection unit 13 is used for detecting the salinity of the ballast water entering the electrolytic unit, the flow detection unit 15 is used for detecting the flow of the ballast water in a main pipeline of the ballast water treatment system, and the effective chlorine analysis unit 16 is used for detecting the effective chlorine concentration in the main pipeline.
The temperature detection unit 12 and the salinity detection unit 13 are disposed in a pipeline where the electrolysis unit is located, and the temperature detection unit 12 and the salinity detection unit 13 are located in front of an inlet of the electrolysis unit, so that the temperature and the salinity of ballast water entering the electrolysis unit can be accurately detected. The effective chlorine analyzing unit 16 is connected to the main line via a water intake line, an inlet of which is located behind the electrolyzing unit, and a flow detecting unit 15 which is provided in the main line, to extract part of the ballast water from the main line, thereby detecting the concentration of effective chlorine.
Since the effective chlorine concentration in the main line depends on the effective chlorine yield of the electrolytic cell and the flow rate of the ballast water in the main line, which in turn depends on the magnitude of the electrolytic current and the current efficiency of the electrolytic cell, the relationship between the effective chlorine concentration (L), the flow rate of the ballast water in the main line (S), the electrolytic current (I) of the electrolytic cell, and the current efficiency (η) of the electrolytic cell can be expressed as I × η × K ═ L × S (hereinafter referred to as "formula one"), where K is a fixed coefficient relating to the number of electrolytic cells in the electrolytic cell, and is expressed in g/(a · h), in practical implementation.
The current efficiency of the electrolysis unit has obvious correlation with the temperature and salinity of ballast water, and is influenced by other factors such as seawater quality, plate working time and the like, but the ship ballast water treatment is only carried out during loading or unloading, and the factors influencing the current efficiency such as the seawater quality, the plate working time and the like can not be obviously changed within the time of one-time loading or unloading, so the change of the current efficiency of the electrolysis unit is mainly influenced by the temperature and the salinity. Therefore, by pre-establishing the relation data of current efficiency-temperature-salinity, the theoretical current efficiency of the electrolytic unit can be found and obtained through the real-time measurement of the temperature and salinity of the ballast water entering the electrolytic unit.
Referring to fig. 2, after the temperature and salinity of the ballast water entering the electrolytic unit are detected, a unique current efficiency can be obtained by searching the data and used as the current theoretical current efficiency. In this regard, before the ship ballast water treatment system is used, the current efficiency of the electrolysis unit at different temperatures (0-40 ℃) and different salinity (3-35PSU) is measured using natural clean seawater, thereby establishing a graph of the current efficiency with respect to temperature and salinity as shown in fig. 2, and stored in the control unit 11 in advance. It will be appreciated that the current efficiency-temperature-salinity relationship data is the same for the same electrolysis cell.
A control unit 11 for controlling the electrolysis unit to start operating at a rated electrolysis current, wherein the process of calculating the rated electrolysis current may be:
calculating a rated chlorine yield according to the rated effective chlorine concentration and the rated flow, and acquiring the rated current efficiency of the electrolysis unit according to the rated temperature, the rated salinity and the current efficiency-temperature-salinity relation data of the electrolysis unit;
and calculating the rated electrolytic current of the electrolytic unit according to the rated current efficiency and the rated chlorine yield.
Wherein, the rated effective chlorine concentration and the rated flow are preset working parameters of the ballast water treatment system, the rated temperature and the rated salinity are preset environmental values, such as 20 ℃ and 30PSU respectively, and after the rated current efficiency and the rated chlorine yield are respectively obtained, the rated electrolytic current of the electrolytic unit can be calculated according to the formula I.
And the control unit 11 is also used for calculating a current efficiency correction factor of the electrolysis unit according to the detection data and the rated electrolysis current of the temperature detection unit 12, the salinity detection unit 13, the flow detection unit 15 and the effective chlorine analysis unit 16 and the relation data of the current efficiency, the temperature and the salinity of the electrolysis unit after the electrolysis unit starts to work. The process of calculating the current efficiency correction factor may be:
acquiring a first theoretical current efficiency according to the detection data of the temperature detection unit 12 and the salinity detection unit 13 and the current efficiency-temperature-salinity relation data of the electrolysis unit, and calculating the actual current efficiency according to the detection data of the flow detection unit 15 and the effective chlorine analysis unit 16 and the rated electrolysis current;
and calculating a current efficiency correction factor of the electrolysis unit according to the first theoretical current efficiency and the actual current efficiency.
Wherein, after the ship ballast water treatment system is started for a period of time, the current efficiency correction factor of the electrolysis unit is calculated, according to the temperature of the ballast water entering the electrolytic unit measured by the temperature detection unit 12, the salinity of the ballast water entering the electrolytic unit measured by the detection data of the salinity detection unit 13 and the current efficiency-temperature-salinity relation data of the electrolytic unit, the first theoretical current efficiency under the current working condition can be found and obtained, according to the flow rate of the ballast water in the main pipeline measured by the flow rate detection unit 15, the effective chlorine concentration of the ballast water in the main pipeline measured by the effective chlorine analysis unit 16 and the current electrolytic current of the electrolysis unit, namely the rated electrolytic current, the actual current efficiency under the current working condition can be calculated, in the present embodiment, the current efficiency correction factor is a ratio between the actual current efficiency and the first theoretical current efficiency.
Therefore, the theoretical electrolytic efficiency of the electrolytic unit under the actual working condition is corrected according to the detection data of the effective chlorine analysis unit 16 and the rated electrolytic current. Because the relation data of the theoretical electrolytic efficiency of the electrolytic unit and the temperature and the salinity are established in advance, and the correction factor of the theoretical electrolytic efficiency of the electrolytic unit is obtained through calculation, in the subsequent control process, the effective chlorine concentration does not need to be detected continuously by the effective chlorine analysis unit 16, the temperature, the salinity and the flow which are easy to measure in real time can be used for replacing the monitoring of the effective chlorine concentration, and the dosage of the effective chlorine is effectively controlled through the real-time adjustment of the electrolytic current.
The control unit 11 is further configured to obtain detection data of the temperature detection unit 12, the salinity detection unit 13, and the flow rate detection unit 15 in real time after the current efficiency correction factor is obtained through calculation, and control the electrolytic current of the electrolysis unit according to the rated effective chlorine concentration, the current efficiency correction factor, the current efficiency-temperature-salinity relation data, and the detection data of the temperature detection unit 12, the salinity detection unit 13, and the flow rate detection unit 15. The specific process can be as follows:
acquiring a second theoretical current efficiency according to the detection data of the temperature detection unit 12 and the salinity detection unit 13 and the relation data of the current efficiency and the temperature-salinity;
calculating actual electrolytic current according to the current efficiency correction factor, the second theoretical current efficiency, the rated effective chlorine concentration and the detection data of the flow detection unit 15;
and controlling the electrolysis unit to work according to the actual electrolysis current.
According to the temperature of the ballast water entering the electrolytic unit measured by the temperature detection unit 12, the salinity of the ballast water entering the electrolytic unit measured by the salinity detection unit 13 and the relationship data of current efficiency-temperature-salinity, the second theoretical current efficiency under the current working condition can be found and obtained, and the second theoretical current efficiency is corrected according to the current efficiency correction factor to obtain the actual current efficiency under the current working condition. Then, based on the formula one, the actual electrolytic current under the current working condition can be calculated according to the actual current efficiency under the current working condition, the rated effective chlorine concentration and the flow rate of the ballast water in the main pipeline measured by the flow rate detection unit 15, wherein the rated effective chlorine concentration is the preset effective chlorine concentration control value. And finally, controlling the electrolysis unit to work according to the actual electrolysis current, wherein the chlorine yield of the electrolysis unit is changed after the electrolysis current of the electrolysis unit is changed, so that the effective chlorine concentration in the main pipeline is changed, and the electrolysis current of the electrolysis unit is calculated according to the rated effective chlorine concentration, so that the effective chlorine concentration in the main pipeline is always maintained in a set interval range, and the fluctuation of the effective chlorine concentration in the ballast water is obviously reduced.
The invention relates to a ship ballast water treatment control device, which firstly controls an electrolytic unit to start working at a rated electrolytic current, then calculates a current efficiency correction factor of the electrolytic unit according to the temperature of ballast water entering the electrolytic unit, the salinity of the ballast water entering the electrolytic unit, the flow rate of the ballast water in a main pipeline, a detected value of effective chlorine concentration in the main pipeline, the rated electrolytic current and current efficiency-temperature-salinity relation data of the electrolytic unit, then obtains the temperature of the ballast water of the electrolytic unit, the salinity of the ballast water entering the electrolytic unit and the detected value of the flow rate of the ballast water in the main pipeline in real time, and controls the electrolytic current of the electrolytic unit according to the obtained detected value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data. According to the invention, by establishing the relation data of current efficiency-temperature-salinity of the electrolysis unit, the monitoring of the concentration of the effective chlorine can be replaced by the temperature, salinity and flow which are easier to measure in real time, so that the real-time adjustment of the electrolysis current is realized, and the dosage of the effective chlorine is further effectively controlled.
Second embodiment
Fig. 3 is a flowchart illustrating a ship ballast water treatment control method according to a second embodiment of the present invention. As shown in fig. 3, the ship ballast water treatment control method of the present embodiment includes:
and 340, controlling the electrolytic current of the electrolytic unit according to the acquired detection value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data.
Wherein, in step 310, controlling the electrolysis unit of the ship ballast water treatment system to start operating at a rated electrolysis current comprises:
calculating a rated chlorine yield according to the rated effective chlorine concentration and the rated flow, and acquiring the rated current efficiency of an electrolysis unit according to the rated temperature, the rated salinity and the current efficiency-temperature-salinity relation data of the electrolysis unit of the ship ballast water treatment system;
calculating the rated electrolytic current of the electrolytic unit according to the rated current efficiency and the rated chlorine yield;
starting the electrolysis unit according to the rated electrolysis current.
In step 320, calculating a current efficiency correction factor of the electrolysis unit according to the temperature of the ballast water entering the electrolysis unit, the salinity of the ballast water entering the electrolysis unit, the flow rate of the ballast water in the main pipeline of the ship ballast water treatment system, the detected value and the rated electrolysis current of the effective chlorine concentration in the main pipeline, and the current efficiency-temperature-salinity relation data of the electrolysis unit, includes:
acquiring a first theoretical current efficiency according to the temperature of ballast water entering an electrolysis unit, the salinity detection value of the ballast water entering the electrolysis unit and current efficiency-temperature-salinity relation data of the electrolysis unit, and calculating actual current efficiency according to the flow of the ballast water in a main pipeline, the detection value of the effective chlorine concentration in the main pipeline and the rated electrolysis current;
the first theoretical current efficiency and the actual current efficiency calculate a current efficiency correction factor for the electrolysis cell.
In step 340, controlling the electrolysis current of the electrolysis unit according to the acquired detection value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data, and the method comprises the following steps:
acquiring a second theoretical current efficiency according to the temperature of the ballast water entering the electrolytic unit, the salinity detection value of the ballast water entering the electrolytic unit and the current efficiency-temperature-salinity relation data;
calculating actual electrolytic current according to the current efficiency correction factor, the second theoretical current efficiency, the rated effective chlorine concentration and the detected value of the flow of the ballast water in the main pipeline;
and controlling the electrolysis unit to work according to the actual electrolysis current, and returning to the step 330.
For the implementation and calculation process of the above steps, reference is made to the description of the embodiment shown in fig. 1, and details are not repeated here.
In practical implementation, before step 330, the following steps are further included:
calculating a first electrolytic current according to the first theoretical current efficiency, the current efficiency correction factor, the rated effective chlorine concentration and the flow of ballast water in the main pipeline when the effective chlorine analysis unit samples;
and controlling the electrolysis unit to work according to the first electrolysis current.
Wherein the electrolysis unit is operated at the first calculated rated electrolysis current before operating at the first electrolysis current, and the electrolysis current is adjusted once before step 330. After the electrolysis unit is controlled to work according to the first electrolysis current, the temperature of ballast water of the electrolysis unit, the salinity of the ballast water entering the electrolysis unit and the flow detection value of the ballast water in the main pipeline are obtained in real time, so that the electrolysis current of the electrolysis unit is adjusted in real time, and further the effective chlorine concentration is adjusted in real time.
The invention discloses a ship ballast water treatment control method, which comprises the steps of firstly controlling an electrolysis unit to start working at a rated electrolysis current, then calculating a current efficiency correction factor of the electrolysis unit according to the temperature of ballast water entering the electrolysis unit, the salinity of the ballast water entering the electrolysis unit, the flow rate of the ballast water in a main pipeline, a detected value of effective chlorine concentration in the main pipeline, the rated electrolysis current and current efficiency-temperature-salinity relation data of the electrolysis unit, then obtaining the temperature of the ballast water of the electrolysis unit, the salinity of the ballast water entering the electrolysis unit and the detected value of the flow rate of the ballast water in the main pipeline in real time, and controlling the electrolysis current of the electrolysis unit according to the obtained detected value, the rated effective chlorine concentration, the current efficiency correction factor and the current efficiency-temperature-salinity relation data. According to the invention, by establishing the relation data of current efficiency-temperature-salinity of the electrolysis unit, the monitoring of the concentration of the effective chlorine can be replaced by the temperature, salinity and flow which are easier to measure in real time, so that the real-time adjustment of the electrolysis current is realized, and the dosage of the effective chlorine is further effectively controlled.
Third embodiment
Fig. 4 is a schematic structural view of a ship ballast water treatment system according to a third embodiment of the present invention. As shown in fig. 4, the ship ballast water treatment system 50 of the present embodiment includes an electrolysis unit 51 and a ship ballast water treatment control device including a temperature detection unit 12, a salinity detection unit 13, a flow rate detection unit 15, an effective chlorine analysis unit 16, and a control unit 11.
The signal output end of the temperature detection unit 12 is connected with the input end of the control unit 11, the output end of the effective chlorine analysis unit 16 is connected with the input end of the control unit 11, and the flow detection unit 15 is connected with the input end of the control unit 11. In this embodiment, the control unit 11 includes an operation control module and an electrolysis power control module, an input end of the operation control module is connected to the temperature detection unit 12, the salinity detection unit 13, the flow detection unit 15, and the available chlorine analysis unit 16, an output end of the operation control module is connected to an input end of the electrolysis power control module, and an output end of the electrolysis power control module is connected to the electrolysis power of the electrolysis unit 51.
In the present embodiment, the ship ballast water treatment system 50 includes a main pipeline 52 and an electrolysis pipeline 53, an inlet of the main pipeline 52 is provided with a filter 55, an inlet and an outlet of the electrolysis pipeline 53 are respectively communicated with the main pipeline 52, the electrolysis unit 51, the temperature detection unit 12 and the salinity detection unit 13 are disposed in the electrolysis pipeline 53, and the temperature detection unit 12 and the salinity detection unit 13 are located before the inlet of the electrolysis unit 51. The effective chlorine analyzing unit 16 is connected to the main line 52 via a water intake line 56, and an inlet of the water intake line 56 is located behind the electrolyzing unit 51. The flow rate detecting means 15 is provided in the main line 52, and the flow rate detecting means 15 is located between the inlet of the water intake line 56 and the electrolysis means 51.
The effective chlorine solution in the main pipeline 52 is generated by electrolyzing ballast water through the electrolysis unit 51, has strong oxidizability, and can kill plankton, larva, spore, pathogen and other organisms in seawater. The temperature detecting unit 12 is used for detecting the temperature of the ballast water entering the electrolytic unit 51, the salinity detecting unit 13 is used for detecting the salinity of the ballast water entering the electrolytic unit 51, the flow rate detecting unit 15 is used for detecting the flow rate of the ballast water in the main pipeline 52, and the effective chlorine analyzing unit 16 is used for detecting the effective chlorine concentration in the main pipeline 52.
The control process of the ship ballast water treatment system 50 of the present embodiment in actual conditions will be described in detail below.
Before the ship ballast water treatment system 50 starts to work, the rated effective chlorine concentration of the main pipeline 52 is set to be 7.5ppm, and the rated flow of the main pipeline 52 is set to be 1000m3Calculating to obtain the rated chlorine yield of the electrolysis unit 51 of 7.5kg/h, and inquiring the relation graph of the current efficiency, the seawater temperature and the salinity shown in figure 2 to obtain 30PSU at the temperature of 20 DEG CThe current efficiency of the electrolysis unit 51 corresponding to the seawater is 87.1%, and the rated electrolysis current of the electrolysis unit 51 is 406.8A according to the formula I.
The control electrolytic unit 51 is started according to the rated electrolytic current 406.8A, after the system is operated stably, for example, after the system is operated for a period of time, a certain amount of water sample is taken through the water taking pipeline 56 of the effective chlorine analysis unit 16 and is conveyed to the effective chlorine analysis unit 16, meanwhile, the temperature detection unit 12 measures the temperature of the inflow water of the electrolytic unit 51 at 18 ℃ in real time, the salinity detection unit 13 measures the salinity of the inflow water of the electrolytic unit 51 at 25PSU in real time, and the flow detection unit 15 measures the flow of the main pipeline 52 at 1200m in real time3H, to the control unit 11. The control unit 11 queries a relation graph of the current efficiency of the built-in electrolysis unit 51 and the temperature and salinity of the inflow water according to the temperature and the salinity measured by the temperature detection unit 12 and the salinity detection unit 13, and obtains the theoretical current efficiency of the electrolysis unit 51 under the operating condition of 86.1%. At this time, the available chlorine concentration measured by the available chlorine analyzing unit 16 was 5.65ppm and transmitted to the control unit 11, and the control unit 11 combined with the rated electrolytic current 406.8A and the flow rate 1200m of the main line 523The actual current efficiency of the electrolysis unit 51 was calculated to be 78.7%.
The current efficiency correction factor of 0.914 was obtained by dividing the actual current efficiency of 78.7% of the electrolysis unit 51 by the theoretical current efficiency of 86.1% of the electrolysis unit 51 under operating conditions.
Then, the control unit 11 controls the flow rate of the main line 52 to 1200m according to the rated available chlorine concentration of 7.5ppm3The theoretical current efficiency of the electrolysis unit 51 is 86.1%, the current efficiency correction factor is 0.914, and the electrolysis current of the electrolysis unit 51 is calculated to be 540.2A. The control unit 11 adjusts the output current to 540.2A.
When the ship ballast water treatment system 50 continues to operate, the temperature detection unit 12 and the salinity detection unit 13 measure the inflow water temperature and salinity information of the electrolysis unit 51 in real time, find that the water temperature is reduced to 15 ℃, the salinity is still 25PSU, query the relation graph of the current efficiency of the built-in electrolysis unit 51 and the inflow water temperature and the salinity, obtain the theoretical current efficiency of the electrolysis unit 51 under the operating condition of 85.2 percent, and multiply the theoretical current efficiency by the theoretical current efficiency and the salinity of the electrolysis unit 51The current efficiency correction factor of 0.914 yields the actual current efficiency of 77.9% for the electrolysis cell 51 in operational operation. Meanwhile, the flow rate detecting unit 15 measures the flow rate of the main line 52 in real time to become 1100m3H, the rated available chlorine concentration is 7.5ppm according to the system setting, the actual current efficiency of the electrolysis unit 51 is 77.9 percent, and the flow of the main pipeline 52 is 1100m3The electrolytic current of the electrolytic cell 51 was calculated to be 500.3A, and the electrolytic current of the electrolytic cell 51 was adjusted to 500.3A.
When the ship ballast water treatment system 50 continues to operate, the ship ballast water treatment control apparatus measures the inflow water temperature, salinity of the electrolysis unit 51 and the flow rate of the main line 52 in real time, calculates the electrolysis current of the electrolysis unit 51, and outputs a corresponding control signal to the electrolysis unit 51.
In actual operation, the effective chlorine concentration fluctuation in the main pipeline 52 of the ship ballast water treatment system 50 adopting the ship ballast water treatment control device can be controlled within 7.5 +/-0.5 ppm, the stability is obviously improved compared with other control methods, and the ballast water treatment effect is ensured.
Fourth embodiment
Fig. 5 is a schematic structural view of a ship ballast water treatment system according to a fourth embodiment of the present invention. As shown in fig. 5, the ship ballast water treatment system 60 of the present embodiment includes an electrolysis unit 61 and a ship ballast water treatment control device including a temperature detection unit 12, a salinity detection unit 13, a flow rate detection unit 15, an effective chlorine analysis unit 16, and a control unit 11.
The signal output end of the temperature detection unit 12 is connected with the input end of the control unit 11, the output end of the effective chlorine analysis unit 16 is connected with the input end of the control unit 11, and the flow detection unit 15 is connected with the input end of the control unit 11. In this embodiment, the control unit 11 includes an operation control module and an electrolysis power control module, an input end of the operation control module is connected to the temperature detection unit 12, the salinity detection unit 13, the flow detection unit 15, and the available chlorine analysis unit 16, an output end of the operation control module is connected to an input end of the electrolysis power control module, and an output end of the electrolysis power control module is connected to the electrolysis power of the electrolysis unit 61.
In the present embodiment, the ship ballast water treatment system includes a main pipeline 62, an inlet of the main pipeline 62 is provided with a filter 65, an electrolysis unit 61, a temperature detection unit 12, and a salinity detection unit 13 are disposed in the main pipeline 62, and the temperature detection unit 12 and the salinity detection unit 13 are located before the inlet of the electrolysis unit 61. The effective chlorine analyzing unit 16 is connected to the main line 62 via a water intake line 66, and an inlet of the water intake line 66 is located behind the electrolyzing unit 61. The flow rate detecting means 15 is provided in the main line 62, and the flow rate detecting means 15 is located between the inlet of the water intake line 66 and the electrolysis means 61.
The effective chlorine solution in the main pipeline 62 is generated by electrolyzing ballast water through the electrolysis unit 61, and the effective chlorine solution has strong oxidizability and can kill organisms such as plankton, larvae, spores and pathogens in seawater. The temperature detecting unit 12 is used for detecting the temperature of the ballast water entering the electrolytic unit 61, the salinity detecting unit 13 is used for detecting the salinity of the ballast water entering the electrolytic unit 61, the flow rate detecting unit 15 is used for detecting the flow rate of the ballast water in the main pipeline 62, and the effective chlorine analyzing unit 16 is used for detecting the effective chlorine concentration in the main pipeline 62.
The control process of the ship ballast water treatment system 60 of the present embodiment in actual conditions will be described in detail below.
Before the ship ballast water treatment system 60 starts to operate, the rated flow of the main pipeline 62 is 300m according to the set effective chlorine concentration of 5.0ppm of the main pipeline 623And/h, calculating to obtain the rated chlorine yield of the electrolysis unit 61 of 1500g/h, inquiring a relation graph of the current efficiency, the seawater temperature and the salinity shown in figure 2 to obtain the current efficiency of the electrolysis unit 61 under the seawater of 30PSU at 20 ℃ of 88.0 percent, and calculating to obtain the rated electrolysis current of 128.8A according to a formula I.
The electrolytic unit 61 is controlled to start according to the rated electrolytic current of 128.8A, after the system runs stably, a certain amount of water sample is taken through the water taking pipeline 66 of the effective chlorine analysis unit 16 and is conveyed to the effective chlorine analysis unit 16, and meanwhile, the temperature detection unit 12 measures the inflow water of the electrolytic unit 61 at 25 ℃ in real time and the salinity is detectedThe measuring unit 13 measures the salinity of the inflow water of the electrolysis unit 61 to be 35PSU in real time, and the flow detection unit 15 measures the flow of the main pipeline 62 to be 250m in real time3H, to the control unit 11. The control unit 11 queries a relation graph of the current efficiency of the built-in electrolysis unit 61 and the temperature and salinity of the inflow water according to the temperature and the salinity measured by the temperature detection unit 12 and the salinity detection unit 13, and obtains the theoretical current efficiency of the electrolysis unit 61 under the operating condition of 88.8%. At this time, the available chlorine concentration measured by the available chlorine analyzing unit 16 was 5.85ppm, and the measured available chlorine concentration was transmitted to the control unit 11, and the control unit 11 combined the available chlorine concentration of 5.85ppm and the flow rate of 250m3The actual current efficiency of the electrolysis unit 61 was calculated to be 85.8% at/h and the rated electrolysis current of 128.8A.
The current efficiency correction factor of 0.966 is obtained by dividing the actual current efficiency of the electrolysis unit 61 by the theoretical current efficiency of 88.8% of the electrolysis unit 61 under the operation condition.
Then, the control unit 11 calculates the electrolytic current of the electrolytic unit 61 to be 132.1A according to the rated available chlorine concentration of 5.0ppm, the flow rate of the main line 62 of 250m3/h, the theoretical current efficiency of the electrolytic unit 61 of 88.8 percent and the correction factor of 0.966. The control unit 11 outputs a signal to the electrolytic power controller of the ship ballast water treatment system 60 so that the output current is adjusted to 132.1A.
When the ship ballast water treatment system 60 continues to operate, the temperature detection unit 12 and the salinity detection unit 13 measure the inflow water temperature and salinity information of the electrolysis unit 61 in real time, find that the water temperature is increased to 30 ℃ and the salinity is reduced to 25PSU, query the relationship graph of the current efficiency of the built-in electrolysis unit 61 and the inflow water temperature and the salinity, obtain the theoretical current efficiency of the electrolysis unit 61 under the operating condition of 84.9 percent, and multiply the theoretical current efficiency by a current efficiency correction factor of 0.966 to obtain the actual current efficiency of the electrolysis unit 61 under the operating condition of 82.0 percent. Meanwhile, the flow rate of the pressure main line 62 measured in real time by the flow rate detecting unit 15 becomes 320m3H, the control unit 11 controls the flow rate of the main pipeline 62 to be 320m according to the rated available chlorine concentration of 5.0ppm, the actual current efficiency of the electrolysis unit 61 of 82.0 percent3The electrolysis current of the electrolysis unit 61 is calculated to be 147.5A according to a chlorine yield calculation formula and is output to an electrolysis power supplyA controller, thereby adjusting the electrolysis current to 147.5A.
During the operation of the ballast water treatment system, the inflow water temperature and salinity of the electrolysis unit 61 and the flow of the main pipeline 62 are measured in real time, the electrolysis current of the electrolysis unit 61 is obtained through calculation, and the electrolysis current is adjusted. When the system is actually operated, the effective chlorine concentration of the ballast water main pipeline 62 is always maintained within the set range of 5.0 +/-0.5 ppm, and the fluctuation of the effective chlorine concentration in the ballast water is obviously reduced.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. A ship ballast water treatment control method is characterized by comprising the following steps:
calculating a rated chlorine yield according to the rated effective chlorine concentration and the rated flow, and acquiring rated current efficiency of an electrolysis unit of the ship ballast water treatment system according to rated temperature, rated salinity and current efficiency-temperature-salinity relation data of the electrolysis unit;
calculating the rated electrolytic current of the electrolytic unit according to the rated current efficiency and the rated chlorine yield, wherein the formula for calculating the rated electrolytic current is as follows: i × η × K = L × S, L being an effective chlorine concentration, S being a flow rate of ballast water in the main line, I being an electrolysis current of the electrolysis unit, η being a current efficiency of the electrolysis unit, K being a fixed coefficient related to the number of electrolytic cells of the electrolysis unit, and having a unit of g/(a · h);
starting the electrolysis unit according to the rated electrolysis current;
acquiring a first theoretical current efficiency according to the temperature of ballast water entering the electrolytic unit, the salinity detection value of the ballast water entering the electrolytic unit and current efficiency-temperature-salinity relation data of the electrolytic unit, and calculating actual current efficiency according to the flow of the ballast water in a main pipeline, the detection value of the effective chlorine concentration in the main pipeline and the rated electrolytic current;
calculating a current efficiency correction factor for the electrolysis cell for the first theoretical current efficiency and the actual current efficiency;
acquiring detection values of the temperature of ballast water of the electrolytic unit, the salinity of the ballast water entering the electrolytic unit and the flow of the ballast water in a main pipeline in real time;
acquiring a second theoretical current efficiency according to the temperature of the ballast water entering the electrolytic unit, the salinity detection value of the ballast water entering the electrolytic unit and the current efficiency-temperature-salinity relation data;
calculating actual electrolytic current according to the current efficiency correction factor, the second theoretical current efficiency, the rated effective chlorine concentration and the detected value of the flow of the ballast water in the main pipeline;
controlling the electrolysis unit to work according to the actual electrolysis current so as to maintain the concentration of the effective chlorine in the main pipeline within a set interval range; and returning to the step of acquiring the detected values of the temperature of the ballast water of the electrolytic unit, the salinity of the ballast water entering the electrolytic unit and the flow rate of the ballast water in the main pipeline in real time.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105585182A (en) * | 2016-03-03 | 2016-05-18 | 金晨光 | Ballast water treatment equipment |
| CN105800842A (en) * | 2016-06-02 | 2016-07-27 | 章明歅 | Circulating cooling water bypass flow water treatment system and bypass flow water treatment method |
| CN106115860A (en) * | 2015-05-08 | 2016-11-16 | 泰科罗斯有限公司 | The ship ballast water processing means of electrolysis mode and method |
| KR20170047516A (en) * | 2015-10-23 | 2017-05-08 | 한국해양대학교 산학협력단 | Apparatus for sterilization of ballast water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106115860A (en) * | 2015-05-08 | 2016-11-16 | 泰科罗斯有限公司 | The ship ballast water processing means of electrolysis mode and method |
| KR20170047516A (en) * | 2015-10-23 | 2017-05-08 | 한국해양대학교 산학협력단 | Apparatus for sterilization of ballast water |
| CN105585182A (en) * | 2016-03-03 | 2016-05-18 | 金晨光 | Ballast water treatment equipment |
| CN105800842A (en) * | 2016-06-02 | 2016-07-27 | 章明歅 | Circulating cooling water bypass flow water treatment system and bypass flow water treatment method |
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