WO2018070665A1

WO2018070665A1 - Apparatus and method for measuring residual chlorine concentration

Info

Publication number: WO2018070665A1
Application number: PCT/KR2017/009597
Authority: WO
Inventors: 박규원; 김성태; 이해돈; 이광호; 박혜진; 조유경
Original assignee: (주) 테크로스
Priority date: 2016-10-10
Filing date: 2017-09-01
Publication date: 2018-04-19
Also published as: KR20180039779A; KR101859984B1

Abstract

The present invention relates to an apparatus for measuring residual chlorine concentration, comprising: a measuring part having a light emitting part and a light receiving part, and having a sample water inflow tube through which sample water flows in; a reagent storing part made from a shrinkable material so as to inject a reagent into the measuring part, and having a reagent inflow tube; and a control part for measuring the concentration of an oxidant in the sample water on the basis of a signal generated when light generated by the light emitting part passes through the sample water and then is received in the light receiving part, thereby simplifying a structure so as to improve durability, and controlling the amount of the reagent injected.

Description

Residual Chlorine Concentration Measurement Apparatus and Method

The present invention relates to an apparatus and method for measuring residual chlorine concentration. More particularly, the present invention relates to a residual chlorine concentration measuring apparatus and method for simplifying a configuration for supplying a reagent to improve durability as well as controlling a reagent supply amount.

Generally, cargo ships transported by sea are mostly one-way except for ships reciprocating to exchange similar cargoes. In addition, when returning sailing with the one-way operation at full load, the ballast water is introduced into the ship to sail in the ballast state for improving the balance, safety, and steering performance of the ship.

At this time, the ballast water is filled in one port and transported to another, where it is discharged in a new port. As such, the release of marine organisms and pathogens contained in ballast water taken from remote locations is not only harmful to the new environment, but also dangerous for both humans and animals in new ports.

Introducing non-natural marine life into new ecosystems can have destructive effects on natural flora and fauna that may not have natural defenses against new species. In addition, harmful bacterial pathogens such as cholera may be present in the original ports. These pathogens can multiply in the ballast tanks over time, causing disease in the areas where they are released.

The risk posed by these marine organisms and pathogens can be controlled by lethal species mentioned above in ballast water.

The electrolysis method is mainly used for sterilizing ballast water, and the ballast water treatment system using the electrolysis method is equipped with a TRO sensor unit for measuring the TRO of ballast water.

Here, "TRO" is an abbreviation of "Total Residual Oxidant", which means the total residual oxidant present in the ballast water, and chlorine generated through electrolysis process oxidizes the aquatic organisms in the ballast water, and the remaining chlorine of the remaining chlorine Measure and find the value. When electrolysis or chlorination of seawater or salty water is performed, TRO is replaced with an atom such as bromine instead of active chlorine, and various types of oxidants coexist.

Since the above-described TRO sensor must operate in various water quality conditions such as fresh water and sea water depending on the route of the ship, the TRO sensor is mainly used with a DPD reagent which is less sensitive to changes in water quality.

The TRO measuring sensor using DPD reagent not only includes a transfer pump to inject reagent into the measuring part in the reagent container, but also includes a check valve in the supply pipe to prevent backflow during the transfer of the reagent through the transfer pump. The configuration is very complicated.

Since the transfer pump included in the TRO measuring sensor is used for the transfer of the DPD reagent, which is a chemical product, corrosion is easily generated, and there is a problem in durability and frequent failure.

In addition, there is a problem that it is difficult to add the DPD reagent quantitatively because the change in the input amount is large depending on the pressure.

The present invention has been made to solve the above problems, and in particular, to simplify the configuration for supplying the reagents of ballast water, and to provide a residual chlorine concentration measuring apparatus and method that can control the reagent supply amount There is a purpose.

Residual chlorine concentration measuring device according to the consistent point of the present invention devised to achieve the above object is provided with a light emitting unit and a light receiving unit, the measuring unit is provided with a sample water inlet tube is introduced into the sample water; A reagent reservoir configured of a material capable of shrinking to inject reagent into the measurement unit, and having a reagent inlet pipe; And a control unit measuring the oxidizer concentration of the sample water based on the signal received from the light receiving unit after the light generated by the light emitting unit has passed through the sample water.

Here, a reagent control valve may be installed in the reagent inlet tube. In particular, the reagent control valve may be configured as a pinch valve (Pinch Valve).

The reagent reservoir may be provided in plurality for continuous supply.

In addition, the reagent reservoir may be formed of fluororubber having excellent durability and chemical resistance and an elastic material.

The measuring unit may be provided with an inlet valve in the sample water inlet tube, a sample water discharge tube for discharging the finished sample water, and a discharge valve may be installed in the sample water discharge tube.

Here, the measuring unit may be formed of a transparent material through which light can pass.

In addition, the reagent inlet tube may be composed of a chemical resistant tube.

In the residual chlorine concentration measuring apparatus of the present invention, the light emitting portion may be configured by a white LED, and the light receiving portion may be configured by an RGB sensor.

On the other hand, the residual chlorine concentration measuring method according to another aspect of the present invention is provided with a light emitting portion and a light receiving portion, the sample water inlet tube and the sample water discharge tube is installed and the sample water inlet / discharge, the sample water inlet tube and the sample A measuring unit having an inlet valve and a discharge valve respectively installed in the water discharge pipe; A reagent reservoir configured of a shrinkable material to inject the reagent into the measuring unit, the reagent being discharged by the contraction pressure, and having a reagent inlet tube provided with a reagent control valve in the reagent inlet tube; And using a residual chlorine concentration measuring device including a control unit for controlling the opening and closing of the inlet valve, the discharge valve, the reagent control valve, by measuring the absorbance of the sample water is not injected reagent in the measuring unit to measure the standard absorbance Obtaining; Discharging the sample water having completed the reference absorbance measurement and injecting a new sample water; Injecting a reagent into the replaced sample water to obtain color absorbance; And obtaining residual chlorine concentration based on the reference absorbance and the color absorbance.

According to the present invention, there is an effect of simplifying the structure and improving durability by forming a material that shrinks the reagent reservoir without providing a separate pressurizing means.

In addition, according to the present invention, the reagent supply amount is controlled by the reagent control valve, thereby controlling the supply amount of the reagent.

1 is a block diagram showing a residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

Figure 2 is a graph showing the relative response (Relative Responsivity) of the light receiving unit provided in the residual chlorine concentration measuring apparatus according to an embodiment of the present invention,

3 is a flowchart illustrating a method of measuring residual chlorine concentration according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if shown on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

1 is a block diagram showing a residual chlorine concentration measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the residual chlorine concentration measuring device 100 includes a measuring unit 110 for measuring the residual chlorine concentration of a sample water and a reagent for storing a reagent and then injecting the reagent into the measuring unit 110. The storage unit 130 and the control unit 150 for opening or closing the valve in accordance with the sensing information measured by the measuring unit 110.

The measuring unit 110 is provided at both side surfaces such that the light emitting unit 111 and the light receiving unit 113 face each other. In addition, the measuring unit 110 is formed of a transparent material through which light can pass and is configured to allow the light generated by the light emitting unit 111 to reach the light receiving unit 113 through the measuring unit 110. .

Here, the light emitting unit 111 may be configured as a white LED to measure all three channel wavelength band. In addition, the light receiving unit 113 is composed of an RGB sensor having a color filter corresponding to red, green, and blue, and is configured to recognize all three channel wavelengths. By identifying three wavelength bands, it is possible to increase the accuracy in measuring the concentration of the oxidizing agent developed by DPD, and have the advantage that it can cope with various kinds of reagents that develop in different colors with one device.

Through this configuration, when the white LED of the light emitting unit 111 is turned on, the residual chlorine concentration may be measured by measuring the intensity (light quantity) of the light transmitted from the RGB sensor of the light receiving unit 113.

The measurement unit 110, the sample water inlet tube 121 is installed so that the sample water is introduced, and the sample water discharge pipe 125 is installed so that the sample water is completed.

In addition, an inlet valve 123 is installed in the sample water inlet pipe 121, and a discharge valve 127 is installed in the sample water outlet pipe 125 so that the reagent introduced from the reagent storage unit 130 reacts with the sample water. It is configured to be discharged smoothly later.

Residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, the DPD (diethyl-p-phenylende diamine) reagent in a variety of devices for measuring the oxidant is added to the ballast water The reaction is applied to measure the concentration of residual oxidant.

Since the DPD type oxidant measuring device collects a part of the treated ballast water, the DPD reagent is input to measure the oxide quality, and thus the reagent storage unit 130 for storing the DPD reagent is used as a component. The DPD reagent is mixed with the buffer solution and injected into the measuring unit 110. The DPD reagent and the buffer solution may be mixed and stored in one container, but it is preferable that the DPD reagent is stored in a separate container.

In addition, the reagent storage unit 130 may further include a temperature maintaining means (not shown) maintained at a constant temperature to increase the reactivity of the reagent and the shelf life of the reagent.

Reagent storage unit 130 included in the residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention is composed of a material capable of shrinkage so that the reagent is introduced into the measuring unit 110 without a separate pressing means. .

The reagent storage unit 130 is preferably made of an elastic material that can shrink. It is also preferable to form a symmetrical shape, for example a spherical shape, in order to generate a uniform pressure.

In the reagent storage unit 130 of the present invention, when the reagent is injected into the reagent injection unit (not shown) provided on one side thereof, the reagent storage unit 130 is expanded by the injection pressure, and after the reagent injection is completed, the reagent injection is completed. When the part (not shown) is closed, the expanded reagent storage unit 130 contracts itself by the restoring force, and the reagent is introduced into the measuring unit 110 by the contraction pressure generated at this time, so that no additional pressurization means is required. do.

Thus, the reagent storage unit 130 formed of an elastic material generates a pressing force by the law of the hook (Hook), the force applied is equal to the product of the constant k and the change x of the displacement or length. That is, F = kx. Here, the value of k is related to the size or shape as well as the kind of material of the reagent storage unit 103 under consideration.

In addition, the reagent storage unit 130 is a material excellent in durability and chemical resistance because the reagent is stored therein and repeats the expansion / contraction action.

Examples of the material of the reagent storage unit 130 include natural rubber (NR), butadiene rubber (BR), styrenebutadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), and hydrogenated nitrile butadiene rubber having excellent elasticity and abrasion resistance ( H-NBR), chloroprene rubber (CR), ethylene propylene rubber (EPDM), etc. can be applied, and butyl rubber (IIR), chlorosulfonated polyethylene rubber (CSM), and aplas (FEPM) with excellent elasticity as well as chemical resistance ), Perfluorinated rubber (FFKM), fluororubbers (FKM, FPM) and the like can also be applied. In particular, it is preferable to apply fluororubber excellent in chemical resistance and durability.

On the other hand, the reagent injection unit (not shown) provided in the reagent storage unit 130 may be configured to be coupled to the reagent inlet pipe 141 for supplying the reagent to the measuring unit 110. In such a configuration, when reagent injection is completed, the reagent inlet tube 141 may be connected to the reagent inlet pipe 141 without closing the reagent inlet unit (not shown), and may be used as a path for supplying the reagent.

Residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention, the reagent storage unit 130 and so that the DPD reagent stored in the reagent storage unit 130 is smoothly supplied to the measuring unit 110 containing the sample number A reagent inlet tube 141 may be installed between the measuring units 110, and a reagent control valve 143 may be installed in the reagent inlet tube 141 to control the flow of reagents.

The reagent reservoir 130 may be provided in plural as shown in FIG. 1. By storing the reagents in both the first reagent storage unit 130a and the second reagent storage unit 130b, the second reagent storage unit is preliminarily even if all of the reagents of the first reagent storage unit 130a are consumed. Reagents can be supplied via 130b, allowing for continuous reagent supply.

Here, the reagent inlet tube 141 may be composed of a chemical resistant tube to prevent corrosion and breakage by the supplied reagent.

The reagent control valve 143 may be configured as a pinch valve. The pinch valve is a device that controls the opening and closing of the valve while pressing the elastic body with two bars up and down, and the conveyed fluid comes into contact with only the inside of the elastic body, and no driving parts come into contact with the valve and reagents. This contact eliminates the risk of corrosion of the valve, and improves durability, thereby minimizing maintenance and repair costs.

Reagent storage unit 130 provided in the residual chlorine concentration measuring apparatus 100 according to an embodiment of the present invention is expanded by a predetermined displacement at the initial position when the reagent is injected into the inside and the pressing force by the restoring force when the reagent injection is completed Since the operation is performed by the above-described hook law, as the reagent is supplied to the measuring unit 110, the displacement is reduced and the pressing force is linearly reduced.

Residual chlorine concentration measuring apparatus 100 of the present invention should adjust the opening time of the reagent control valve 143 in consideration of such a linear change in the pressing force in order to supply a quantitative reagent. For example, at the point where the reagent reservoir 130 is contracted at the initial expansion position and the pressing force is 1/2 of the initial pressure, the reagent injection amount can be supplied quantitatively by doubling the opening time of the reagent control valve 143. Can be configured to

The controller 150 measures the residual chlorine concentration of the sample water based on the signal received by the light receiver 113 after the light generated by the light emitter 111 passes through the sample water.

Here, the controller 150 may determine that the sample water does not flow if the inflow valve 123 does not occupy the measuring unit 110 after opening, and may generate an alarm, and the discharge valve 125 may measure after opening. If the sample water of the unit 110 is not discharged, an alarm may be generated. The controller 150 turns on the light emitter 111 when the measuring unit 110 is empty and stores the amount of light measured by the light receiving unit 113, and determines whether the water is supplemented based on this. That is, when the amount of light becomes weaker than a certain amount, it is determined that the sample number is filled. In addition, even when the sample number is empty, if the amount of light is weaker than a certain amount, the measurement unit 110 is determined to be contaminated.

In addition, the controller 150 may repeat the opening / closing operation of the inlet valve 121 so that the reagent injected into the measuring unit 110 is mixed well.

Although not shown in FIG. 1 of the present invention, the measuring unit 110 is formed in a hollow cylindrical shape, the direction of the sample water inlet is formed in a direction in contact with the inner wall surface so that the number of samples injected along the inlet to rotate along the inner wall surface It can also be configured.

On the other hand, in the present embodiment, it may further include an overflow tube 160 connected to the measuring unit 110 to perform an overflow function to discharge when the number of samples in the measuring unit 110 overflows.

Figure 2 is a graph showing the relative response (Relative Responsivity) of the light receiving unit provided in the residual chlorine concentration measuring apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the relative reactivity of the red, green, and blue regions varies depending on the wavelength. For example, the red region increases relative responsiveness at about 750 nm and the green region increases at about 560 nm. Able to know.

The measurement unit 110 of the present invention, using the graph of Figure 2 is measured whether the sample water is filled using the RED area of the RGB sensor, the residual chlorine concentration of the sample water is the GREEN area of the RGB sensor Can be measured using.

That is, when the measuring unit 110 is empty, the light emitting unit 111 is turned on, and the light receiving unit 113 stores the light quantity measured in the RED (wavelength of about 750 nm) region and sets it as a reference value of the number of fillings, and the measuring unit 110. In the state filled with water, the reagent is added to the sample water, the light emitting unit 111 is turned on, and then the amount of light is measured using the GREEN region (560 nm wavelength) of the light receiving unit 113.

3 is a flowchart illustrating a method of measuring residual chlorine concentration according to an embodiment of the present invention. In addition, the residual chlorine concentration measuring method of the present invention uses the residual chlorine concentration measuring apparatus disclosed in FIG.

1 and 3, the residual chlorine concentration measuring method according to an embodiment of the present invention, first, by opening the inlet valve 123 and the discharge valve 127 to bypass the sample water (S110). The sample water that is bypassed washes the sample water inflow space of the sample water inflow pipe 121, the sample water discharge pipe 125, and the measurement unit 110.

Next, the discharge valve 127 is closed to fill the sample water in the measurement unit 110 (S120). Whether the number of samples is filled or not is determined by turning on the light emitting unit 111 and then measuring the amount of light in the light receiving unit 113. When the sample water of the predetermined volume is filled, the inlet valve 123 is closed.

The absorbance of the sample water is measured without setting a reagent into the filled sample water, and a reference point is set (S130). This reference point becomes the reference absorbance.

Thereafter, the discharge valve 127 is opened to discharge the number of samples for which reference absorbance measurement is completed from the measurement unit 110, and after discharge is completed, the discharge valve 127 is closed to inject new sample water into the measurement unit 110. (S140).

At this time, in order to confirm the completion of the discharge of the sample water, the absorbance is measured by the measuring unit 110. Even after the discharge is confirmed, the number of samples is more reliably operated by leaving the discharge valve 127 open for a few seconds and then closing it. To be discharged. This operation reduces the measurement error.

In addition, when the new sample water is injected into the measuring unit 110 in the sample water replacement step (S140), the inlet valve 123 is opened to fill the sample water, and whether or not the sample water is filled is determined by the measurement unit 110. Check with absorbance. When the sample water is filled, the opening / closing of the inlet valve 123 is repeatedly operated. For example, about 0.5 seconds of opening and closing about 0.5 seconds to allow the sample water to flow into the measuring unit 110 while forming a vortex. Through this manipulation, the incoming reagents are mixed well.

Next, the reagent is injected into the replaced sample water (S150), and the color absorbance is measured by the measuring unit 110 (S160).

Here, in the step of injecting the reagent (S150), after the opening / closing operation of the inlet valve 123 is performed two to three times, the reagent control valve 143 is opened for a short time to inject a small amount of reagent, and then closed. As a result, the vortex is formed as described above, and the reagents are well mixed in the measurement unit 110.

In addition, in the embodiment of the present invention the injection of the reagent, as described above the reagent reservoir 130 is It is made of a shrinkable material so that the reagent is discharged by the shrinkage pressure.

Thereafter, the controller 150 converts the residual chlorine concentration based on the measured reference absorbance and color absorbance (S170). That is, when measuring the standard absorbance, the light quantity of the sample water without the reagent is measured, and when the color absorbance is measured, the light quantity of the sample water injected with the reagent is measured to find the difference in the light quantity between each other, Convert to residual chlorine concentration. As an example of the conversion formula, multiplying the difference in light quantity by a value gives a residual chlorine concentration. The a value is determined by the LED of the light emitting unit 111, the transmittance of the measuring unit 110, and the RGB sensor of the light receiving unit 113. All. After mixing the reagents, the number of samples develops color, so that light absorption occurs, and thus the amount of light measured by the light receiving unit 113 is weakened. As the residual chlorine concentration increases, the amount of light is increased and the amount of light decreases. If no color develops after mixing the reagent, the same amount of light as the reference light is measured and there is no difference, so the residual chlorine concentration is zero.

Next, the sample water of the residual chlorine concentration measurement is discharged while the discharge valve 127 is opened (S180).

Subsequently, a repeating operation is performed again from the step S110 of bypassing the sample water in order to measure the residual chlorine concentration of the new sample water.

As such, the residual chlorine concentration measuring apparatus 100 according to the exemplary embodiment of the present invention comprises a reagent storage unit 130 made of a contracted material, so that a separate pressurizing means (for example, a pump) and a check valve are configured. This eliminates the need for improved durability, easier maintenance, and control of the opening time of the reagent control valve 143, thereby maintaining a constant dose of reagents, thereby enabling quantitative supply of reagents.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

A measuring unit having a light emitting unit and a light receiving unit and installed with a sample water inlet tube through which sample water is introduced;

A reagent reservoir configured of a material capable of shrinking to inject reagent into the measurement unit, and having a reagent inlet pipe; And

And a control unit for measuring the oxidant concentration of the sample water based on the signal received from the light receiving unit after the light generated by the light emitting unit has passed through the sample water.
The method according to claim 1,

The reagent inlet pipe is provided with a reagent control valve, residual chlorine concentration measuring device.
The method according to claim 2,

The reagent control valve is a pinch valve (Pinch Valve), residual chlorine concentration measuring device.
The method according to claim 1,

Reagent storage unit is provided with a plurality of the reagent storage unit.
The method according to claim 1,

The measuring unit,

An inlet valve is installed in the sample water inlet pipe,

Residual chlorine concentration measuring apparatus is provided with a sample water discharge pipe for discharging the sample water is completed, the discharge valve is installed in the sample water discharge pipe.
The method according to claim 1,

The measuring unit,

Residual chlorine concentration measuring device is formed of a transparent material that can pass light.
The method according to claim 5,

The light emitting portion is composed of a white LED,

The light receiving unit is composed of an RGB sensor, residual chlorine concentration measuring device.
The method according to claim 1,

The reagent inlet tube is composed of a chemical resistance tube, residual chlorine concentration measuring apparatus.
The method according to claim 1,

The reagent storage unit,

A residual chlorine concentration measuring device formed of fluorine rubber.
A measuring unit having a light emitting unit and a light receiving unit, and having a sample water inlet tube and a sample water discharge tube in which sample water is introduced / exhausted, and an inlet valve and a discharge valve are respectively installed in the sample water inlet tube and the sample water discharge tube;

A reagent reservoir configured of a shrinkable material to inject the reagent into the measuring unit, the reagent being discharged by the contraction pressure, and having a reagent inlet tube provided with a reagent control valve in the reagent inlet tube; And

Using a residual chlorine concentration measuring device including a control unit for controlling the opening and closing of the inlet valve, the discharge valve, the reagent control valve,

Obtaining a reference absorbance by measuring the absorbance of the sample number into which the reagent is not injected in the measurement unit;

Discharging the sample water having completed the reference absorbance measurement and injecting a new sample water;

Injecting a reagent into the replaced sample water to obtain color absorbance;

And obtaining a residual chlorine concentration based on the reference absorbance and the color absorbance.