TW202117559A - Chlorine injection concentration management device, chlorine injection concentration management method, and chlorine injection concentration management program - Google Patents

Abstract

Provided is a chlorine injection concentration management device which makes it possible to align a residual chlorine concentration at a condenser intake port to a target value without necessitating a complicated procedure, as compared to the prior art. A chlorine injection concentration management device 1 for a seawater utilization plant, the device comprising: a data acquisition unit 111 that acquires data of a set including an injection rate of chlorine being injected in from a chlorine injection port in the seawater utilization plant, and the residual chlorine concentration after a predetermined length of time following injection, the residual chlorine concentration being at an inlet port of a condenser that is installed in the seawater utilization plant; a relationship computation unit 112 that takes an exponential approximation of the relationship between the injection rate and the residual chlorine concentration on the basis of data for at least two sets of the injection rate and the residual chlorine concentration; a target concentration acquisition unit 113 that acquires a target value for the residual chlorine concentration; and an optimum chlorine injection rate calculation unit 114 that calculates an optimum value for the injection rate on the basis of the target value for the residual chlorine concentration and the relationship for which the exponential approximation was taken.

Description

Chlorine injection concentration management device, chlorine injection concentration management method, and chlorine injection concentration management program

The present invention relates to a chlorine injection concentration management device, a chlorine injection concentration management method, and a chlorine injection concentration management program. In more detail, it is about the chlorine injection concentration management device, the chlorine injection concentration management method, and the chlorine injection concentration management program used in the power plant and other factories to use seawater.

As a countermeasure against organisms such as barnacles, mytilidae, and biofilms attached to the seawater system that uses seawater in factories that dominate thermal and nuclear power plants, electrolytic chlorine (sodium hypochlorite) from seawater is generally used. ) Injection method.

For example, Patent Document 1 discloses a technique for electrolyzing natural seawater to generate sodium hypochlorite, and injecting an electrolyte containing the sodium hypochlorite into the seawater intake to prevent adhesion of marine organisms.

Patent Document 1: Japanese Patent No. 4932529

As long as the electrolytic chlorine (sodium hypochlorite) is injected into seawater, the concentration will decay immediately, but the decay rate is affected by water temperature and water quality. Therefore, under the conditions of daily fluctuations in water temperature and water quality, it is necessary to suppress attached organisms and attached biofilms, and maintain the performance It is very difficult for the factory to use the residual chlorine concentration (for example, 0.02mg/L) of the environmental protection agreement value of the sea water outlet. The status quo is to give priority to complying with the environmental protection agreement value and control the injection concentration of electrolytic chlorine, which cannot fully achieve the effect of inhibiting attached organisms and attached biofilms.

The current situation is that once a week, manual analysis is used at the inlet of the rehydrator to confirm the concentration of residual chlorine while adjusting the concentration, but the adjustment is only based on the experience of the operator, and the conventional method does not follow a clear theoretical adjustment method. In addition, after changing the injection rate of electrolytic chlorine, the change is reflected before the inlet of the water recombiner. Due to the influence of the storage tank capacity and the downflow time, it takes 30 to 50 minutes. Therefore, in order to meet the target value of the residual chlorine concentration, manual analysis must be repeated several times, which is very cumbersome. This is also the main reason why the chlorine injection of the electrolytic chlorine is carefully set, and the adhesion suppression effect is still not obtained.

In view of the above-mentioned problems, the purpose of the present invention is to provide a chlorine injection concentration management device. Compared with the conventional technology, the residual chlorine concentration at the inlet of the rehydration device can meet the target value without complicated procedures.

The present invention is a chlorine injection concentration management device using seawater in a factory. It is provided with: a data acquisition unit for acquiring group data, that is, the chlorine injection rate injected from the chlorine injection port of the seawater factory, and the injection rate after a predetermined time from the injection , The residual chlorine concentration data set at the inlet of the rehydrator in the seawater utilization plant; the relational calculation unit, based on at least two sets of the injection rate and the residual chlorine concentration data, makes the relationship between the injection rate and the residual chlorine concentration approximate an index ; The target concentration obtaining unit is used to obtain the target value of the residual chlorine concentration; and the target chlorine injection rate calculation unit calculates the target value of the injection rate based on the relationship between the target value of the residual chlorine concentration and the approximate index.

Furthermore, it is preferable to further include a residual chlorine analysis unit that continuously measures the residual chlorine concentration at the inlet of the water rehydration device, and outputs the actual measured value of the residual chlorine concentration to the data acquisition unit.

Furthermore, it is preferable to further include: a predicted value calculation unit that calculates the predicted value of the residual chlorine concentration installed at the outlet of the seawater utilization plant based on the target value of the residual chlorine concentration and the water temperature at the outlet of the rejuvenator or the outlet.

In addition, it is preferable to further include: a second residual chlorine analysis unit for continuously measuring the residual chlorine concentration of the drain; and an alarm unit according to the residual chlorine concentration measured by the second residual chlorine analysis unit and the When the difference between the predicted values exceeds the specified value, an alarm is issued.

In addition, the present invention is a chlorine injection concentration management method, which is a chlorine injection concentration management method using seawater in a factory. It has: a data acquisition step for acquiring group data, that is, chlorine injected from the chlorine injection port of the seawater factory The injection rate, and the residual chlorine concentration set at the inlet of the rewaterer in the seawater utilization factory after the specified time from the injection; the relational calculation step, at least based on the two sets of the injection rate and the residual chlorine concentration data, make the injection The relationship between the rate and the residual chlorine concentration is approximate index; the target concentration obtaining step is used to obtain the target value of the residual chlorine concentration; and the optimal chlorine injection rate calculation step is based on the relationship between the target value of the residual chlorine concentration and the approximate index , Calculate the best value of the injection rate.

In addition, the present invention is a chlorine injection concentration management program. This is a chlorine injection concentration management program using sea water in a factory to make the computer execute the following steps: a data acquisition step to obtain group data, that is, from the chlorine injection of the seawater factory The chlorine injection rate injected at the inlet, and the residual chlorine concentration at the inlet of the water regenerator installed in the seawater utilization factory after a specified time from the injection; the relational calculation steps are based on at least two sets of the injection rate and the residual chlorine concentration data, Make the relationship between the injection rate and the residual chlorine concentration approximate the index; the target concentration obtaining step is used to obtain the target value of the residual chlorine concentration; and the optimal chlorine injection rate calculation step is based on the target value and the approximate index of the residual chlorine concentration Based on the relationship, the optimal value of the injection rate is calculated.

[Effects of the invention] Compared with the conventional technology, no complicated procedures are required, and the residual chlorine concentration at the inlet of the rehydration device can meet the target value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. [1 The first embodiment] [1.1 Summary of the invention] As shown in the test data described later, in the actual machine of the power plant, a continuous residual chlorine concentration analyzer is installed at the inlet of the water regenerator to adjust the chlorine injection rate from the chlorine injection port, that is, the chlorine injection per hour At the same time, analyze the residual chlorine concentration at the inlet of the rehydrator to confirm that the relationship between the injection rate and the residual chlorine concentration can be approximated as an index in which season and water temperature. That is, when plotting the injection rate as the horizontal axis and the residual chlorine concentration as the vertical axis, if a single logarithmic graph is used, the relationship between the injection rate and the residual chlorine concentration can be represented by a straight line.

According to the relationship, after a certain injection rate and the injection rate of chlorine, after a specified time, the group of residual chlorine concentration at the inlet of the rehydrator, and the different injection rate and the specified time after the injection rate of chlorine is injected Then, based on the above two sets of data, the relationship between the injection rate and the residual chlorine concentration can be derived for the group of residual chlorine concentration at the inlet of the rehydrator. According to this relationship and the target value of the residual chlorine concentration at the inlet of the rehydrator, the optimal value of the injection rate can be calculated.

In this way, the target residual chlorine concentration can be achieved without repeating complicated procedures such as manual analysis several times.

[1.2 Composition of the implementation form] Fig. 1 is a functional block diagram of the chlorine injection concentration management device 1 of this embodiment. The chlorine injection concentration management device 1 includes a control unit 11, a residual chlorine analysis unit 12, and a memory unit 13.

The control unit 11 is an integral part of the chlorine injection concentration management device 1. It reads various programs from memory areas such as ROM, RAM, flash memory, or hard disk drive (HDD) and executes them, thereby realizing the various types of this embodiment. Features. The control unit 11 may be a CPU. The control unit 11 includes a data acquisition unit 111, a relationship calculation unit 112, a target concentration acquisition unit 113, and an optimal chlorine injection rate calculation unit 114.

In addition, the control unit 11 also includes a function block for controlling the entire chlorine injection concentration management device 1 and a general function block for communication. However, since most people familiar with the technology understand these general functional blocks, the illustration and description are omitted.

The data acquisition unit 111 acquires group data when the factory uses seawater, that is, the chlorine injection rate injected from the chlorine injection port and the recovery set by the factory using seawater after a specified period of time after the injection rate is used to inject chlorine from the chlorine injection port. Residual chlorine concentration at the inlet of the water tank. In addition, here, the "injection rate" refers to the amount of chlorine injected per hour, which is converted from the electrolysis current value. In more detail, in the seawater electrolysis device, as long as the electrolysis current value is increased, the amount of injected chlorine will increase. The relationship between the electrolysis current value and the amount of chlorine injected is a mathematical formula. However, the mathematical formula changes over a long period of time depending on the deterioration of the electrode, the calcium attached to the electrode, and the implementation of cleaning. Therefore, the specific electrolysis current value is used to measure the residual chlorine concentration of the manual analysis, and the mathematical formula is periodically corrected. For the regularly corrected mathematical formula, the electrolysis current value is applied to calculate the injection rate.

Also, for example, if the water regenerator is located about 500m downstream from the chlorine injection port, when the average flow rate of seawater is about 0.8m/s, a time of about 10 minutes can also be set as the above-mentioned predetermined time.

In addition, the data acquisition unit 111, as described later, the user of the chlorine injection concentration management device 1 can also obtain the GUI (Graphical User Interface) input value displayed on the display screen of the chlorine injection concentration management device 1 as the chlorine injection rate And information on residual chlorine concentration. Alternatively, the measured value of the residual concentration at the inlet of the rehydrator continuously analyzed by the residual chlorine analysis unit 12 described later can be obtained as the data of the residual chlorine concentration.

The relational calculation unit 112 is based on at least two sets of data obtained by the data obtaining unit 111 of the chlorine injection rate and the residual chlorine concentration at the inlet of the rejuvenator to establish the relationship between the chlorine injection rate and the residual chlorine concentration at the inlet of the rejuvenator Approximate index.

The relationship calculation unit 112 approximates the index of the relationship between the chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator, and draws a logarithmic graph with the chlorine injection rate as the horizontal axis and the residual chlorine concentration at the inlet of the rehydrator as the vertical axis. , A straight line can be used to express the relationship between the injection rate and the residual chlorine concentration.

The target concentration obtaining unit 113 obtains the target value of the residual chlorine concentration at the inlet of the rehydration device. As described later, the user of the chlorine injection concentration management device 1 may, for example, obtain the value input from the GUI displayed on the display screen of the chlorine injection concentration management device 1 as the target value of the residual chlorine concentration.

The optimal chlorine injection rate calculation unit 114 applies the target value of the residual chlorine concentration acquired by the target concentration acquisition unit 113 to the relationship between the injection rate and the residual chlorine concentration calculated as an approximate index by the relationship calculation unit 112, thereby calculating the injection The best value of the rate.

Thereby, the user of the chlorine injection concentration management device 1 can grasp the optimal injection rate in order to achieve the target value of the residual chlorine concentration.

The residual chlorine analysis unit 12 continuously measures the residual chlorine concentration at the inlet of the water rehydrator, and outputs the actual measured value of the residual chlorine concentration to the data acquisition unit 111 every time it is measured. The residual chlorine analysis unit 12, for example, can achieve the measurement purpose by using a commercially available continuous analyzer.

The memory 13 is a memory set of data, that is, the chlorine injection rate obtained through the data acquisition unit 111 and the residual chlorine concentration at the inlet of the rehydration device, and the chlorine injection rate and the rehydration device calculated as an approximate index by the relational calculation unit 112 The relationship between the concentration of residual chlorine at the inlet. For example, the relational calculation unit 112 can also read multiple sets of data, that is, the chlorine injection rate stored in the memory unit 13 and the residual chlorine concentration at the inlet of the rehydrator, so that the chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator are The relationship becomes an approximate index. In addition, the optimal chlorine injection rate calculation unit 114 may also read the relationship between the chlorine injection rate stored in the recording unit 13 and the residual chlorine concentration at the inlet of the rehydrator, and calculate the optimal injection rate.

FIG. 2 is a diagram showing an example of the GUI displayed on the display screen of the chlorine injection concentration management device 1 described above.

Step 1: The user enters the current chlorine injection rate in the input field d11, and enters the current residual chlorine concentration at the inlet of the rejuvenator in the input field d12. Step 2: The user enters the changed chlorine injection rate in the input column d21, and after changing the chlorine injection rate in the input column d22, after a specified time, enter the residual chlorine concentration at the inlet of the rehydrator. Step 3: The user enters the current water temperature in the input field t1. Step 4: The user enters the target value of the residual chlorine concentration at the inlet of the rehydrator in the input column o1. Step 5: The user specifies the exponential approximate curve date displayed in the past on the input field p1 as a reference. Thereby, on the display column m1, there are displayed: the exponential approximate curve of the chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator, the target value of the residual chlorine concentration at the inlet of the rehydrator, the original residual chlorine concentration at the inlet of the rehydrator, and the change The approximate curve of the residual chlorine concentration at the inlet of the rehydrator after the chlorine injection rate and the designated past index. In addition, on the display column r1, it is displayed: the optimal chlorine injection rate that becomes the target concentration at the inlet of the rehydrator.

[1.3 Actions of the implementation form] FIG. 3 is a flowchart showing the operation of the chlorine injection concentration management device 1. In step S11, the data acquisition unit 111 acquires the first set of data, the first set of data is based on the chlorine injection rate injected from the chlorine injection port, and after the injection rate of chlorine is injected from the chlorine injection port, after a predetermined period of time, The composition of the residual chlorine concentration at the inlet of the rehydrator.

In step S12, the data acquisition unit 111 acquires the second set of data. The second set of data is based on the chlorine injection rate injected from the changed chlorine injection port, and after the chlorine injection rate is injected from the chlorine injection port, the specified Time, the composition of the residual chlorine concentration at the inlet of the rehydrator.

In step S13, the relationship calculation unit 112 calculates the relationship between the chlorine injection rate and the residual chlorine concentration into an approximate index.

In step S14, the target concentration obtaining unit 113 obtains the target value of the residual chlorine concentration at the inlet of the water rehydrator.

In step S15, the optimum chlorine injection chlorine calculation unit 114 calculates the optimum value of chlorine injection chlorine based on the relationship between the approximate index of the chlorine injection rate and the residual chlorine concentration.

[1.4 Test data] [1.4.1 Field test] At the actual machine of the Tamashima Power Plant in Kurashiki City, Okayama Prefecture, a continuous analyzer was installed at the inlet of the water recombiner located about 500m downstream from the inlet for chlorine injection to measure the chlorine injection rate and after the chlorine injection, it passed about 10 Minutes later, the relationship between the concentration of residual chlorine at the inlet of the rehydrator.

Figure 4A is a graph showing the time-series variation of the chlorine setting injection rate and the residual chlorine concentration at the inlet of the rejuvenator measured on July 5, 2018. Figure 4B is a graph showing the time-series variation of the chlorine injection rate measured on August 8, 2018 and the residual chlorine concentration at the inlet of the rejuvenator. Fig. 4C is a graph showing the time-series variation of the set chlorine injection rate measured on September 14, 2018 and the residual chlorine concentration at the inlet of the rejuvenator. Fig. 4D is a graph showing the time-series variation of the set chlorine injection rate and the residual chlorine concentration at the inlet of the rejuvenator measured on November 7, 2018.

According to the original data of these respective curves, the residual chlorine concentration at 10 points before and after each time point (the 10-minute part of the instantaneous data of every 1 minute) is checked out of multiple time points (time points when the injection concentration is changed) at 1-hour intervals. Calculate these averages. Fig. 5 is a single logarithmic linear graph drawn with each average value as the vertical axis (logarithmic axis) and the set injection rate corresponding to the average value on the horizontal axis. It can be seen from Figure 5 that even if the data measured on any one of July 5, 2018, August 8, 2018, September 14, 2018, and November 7, 2018 are used, the injection rate is horizontal. The axis, the single logarithmic graph with the residual chlorine concentration as the vertical axis (logarithmic axis) can be represented by a straight line, so the relationship between the injection rate and the residual chlorine concentration can be expressed as an approximate index.

[1.4.2 Indoor test] In the room, the seawater is drawn into the flask and chlorine (sodium hypochlorite) is injected. After 10 minutes, the residual chlorine concentration is measured. The tests were conducted on July 26, 2005, September 26, 2005, December 2, 2005, and January 24, 2006. The tests were conducted on the seawater extracted from the waters around Yanai City, Yamaguchi Prefecture. In addition, the test was performed on seawater at three temperature settings of 10°C, 20°C, and 30°C.

In more detail, after the sea water is taken into the flask, the temperature is maintained in a constant temperature bath, sodium hypochlorite is added, and the residual chlorine concentration is measured every predetermined time. The added sodium hypochlorite is calibrated in advance, and the chlorine concentration (calculated value) when the liquid is quantitatively added to the seawater sample is used as the initial chlorine injection concentration. The residual chlorine concentration is determined by the ortho-lysine method to produce color and measure the absorbance. Beforehand, the concentration is calculated by obtaining the calibration curve based on the absorbance of the residual chlorine standard colorimetric solution (a mixture of potassium chromate-potassium dichromate solution and phosphate buffer). At this time, the measurement wavelength is 440nm.

Figure 6A is the time when chlorine (added sodium hypochlorite) was injected into seawater at a water temperature of 10℃ on July 26, 2005, September 26, 2005, December 2, 2005, and January 24, 2006. The injection rate is the horizontal axis, and the residual chlorine concentration after 10 minutes of chlorine injection is the single logarithmic graph drawn on the vertical axis (logarithmic axis). Figure 6B is the time when chlorine (added sodium hypochlorite) was injected into seawater at a water temperature of 20℃ on July 26, 2005, September 26, 2005, December 2, 2005, and January 24, 2006. The injection rate is the horizontal axis, and the residual chlorine concentration after 10 minutes of chlorine injection is the single logarithmic graph drawn on the vertical axis (logarithmic axis). Figure 6C is the time when chlorine (added sodium hypochlorite) was injected into seawater at a temperature of 30℃ on July 26, 2005, September 26, 2005, December 2, 2005, and January 24, 2006. The injection rate is the horizontal axis, and the residual chlorine concentration after 10 minutes of chlorine injection is the single logarithmic graph drawn on the vertical axis (logarithmic axis). In any of the above figures, a single logarithmic graph with the injection rate on the horizontal axis and the residual chlorine concentration on the vertical axis (logarithmic axis) can be represented by a straight line. Therefore, the relationship between the injection rate and the residual chlorine concentration can be expressed as an approximate index.

[2 The second embodiment] [2.1 Summary of the invention] As described above, in the chlorine injection concentration management device 1 of the first embodiment, a certain injection rate and the group of the residual chlorine concentration at the inlet of the water regenerator after a predetermined period of time after the injection rate of chlorine is injected; and injections different from this After the injection rate is used to inject chlorine, the group of residual chlorine concentration at the inlet of the rejuvenator after a specified time; based on the above two sets of data, the relationship between the injection rate and the concentration of residual chlorine is derived, and the relationship and the residual chlorine at the inlet of the rejuvenator For the target value of chlorine concentration, calculate the best value of injection rate.

On the other hand, the chlorine injection concentration management device 1A of the second embodiment calculates the predicted value of the chlorine residual concentration at the outlet based on the target value of the chlorine residual concentration to be achieved when injecting chlorine with the above-mentioned optimal value. When the difference between the actual measured value of the chlorine residual concentration at the drain exceeds the specified value, an alarm is issued.

[2.2 Composition of the implementation form] Fig. 7 is a functional block diagram of the chlorine injection concentration management device 1A of the present embodiment. In addition, in FIG. 7, among the components of the chlorine injection concentration management device 1A, the components that are the same as those of the chlorine injection concentration management device 1 are indicated by the same symbols. In the following, the description of their functions is basically given. Omitted.

The chlorine injection concentration management device 1A is different from the chlorine injection concentration management device 1 and includes a control unit 11A instead of the control unit 11. The control unit 11A is equipped with a predictive value calculation unit 115 in addition to the components of the control unit 11. In addition, the chlorine injection concentration management device 1A is equipped with a second residual chlorine analysis unit 14 and an alarm unit 15 in addition to the components of the chlorine injection concentration management device 1.

The predicted value calculation unit 115 calculates the predicted value of the residual chlorine concentration at the outlet based on the target value of the residual chlorine concentration at the inlet of the rejuvenator obtained by the target concentration obtaining section 113 and the water temperature at the outlet of the rejuvenator. In addition, when the predicted value calculation unit 115 calculates the predicted value, the predicted value is calculated using the theoretical formula shown in [2.3 Theoretical Formula] described later.

The second residual chlorine analysis unit 14 continuously measures the residual chlorine concentration of the drain, and outputs the actual measured value of the residual chlorine concentration to the alarm unit 116 every time it is measured. The second residual chlorine analysis unit 14 can be realized using, for example, a commercially available continuous analyzer.

The alarm unit 15 issues an alarm when the difference between the actual measured value of the residual chlorine concentration at the outlet measured by the second residual chlorine analysis unit 14 described later and the predicted value calculated by the predicted value calculation unit 115 exceeds a predetermined value. In this way, the user of the chlorine injection concentration management device 1A, in order to achieve the predicted value of the residual chlorine concentration of the drain, while injecting chlorine at the optimal injection rate, when the actual measured value of the residual chlorine at the drain deviates from the predicted value by more than a certain amount, The deviation can be identified.

[數學式2]

[2.3 Theoretical formula] The attenuation of the residual concentration of the discharge outlet to the residual chlorine concentration at the inlet of the rehydrator is assumed to be explained by a reaction formula. In the formula, suppose the residual chlorine concentration at the water outlet is C, the residual chlorine concentration at the inlet of the water recombiner is C ₀ , the reaction rate constant is k, and the flow time is t, then the following mathematical formula (1) holds, according to mathematical formula (1 ), the mathematical formula (2) can be derived. [Math (1)]

[Math 2]

[數學式4]

式中，A是常數。E_a 是對海水注入氯結果所產生之次氯酸離子、次溴酸離子等與海水成分之反應中，固有活性化能，例如：是依照發電廠場所和時間之固有常數。又，R是氣體常數，T是復水器出口之水温(K)。In addition, the reaction rate constant k is described by the Arrhenius equation, and as shown in the following equation, it increases as the water temperature rises. [Math 3]

[Math 4]

In the formula, A is a constant. E _a is the inherent activation energy in the reaction between hypochlorite ions, hypobromite ions, etc. produced by injecting chlorine into seawater with seawater components, for example: it is an inherent constant in accordance with the location and time of the power plant. In addition, R is the gas constant, and T is the water temperature (K) at the outlet of the water rejuvenator.

[數學式6]

亦即，由於A、B是常數，因此根據水温T可算出反應速度常數k，根據復水器入口之殘留氯濃度可預測放水口之殘留氯濃度。In the above formula, if E _a /R is replaced by the constant B, it becomes the following formula. [Math 5]

[Math 6]

That is, because A and B are constants, the reaction rate constant k can be calculated based on the water temperature T, and the residual chlorine concentration at the water outlet can be predicted based on the residual chlorine concentration at the inlet of the water recombiner.

As a specific prediction method, the first step: in the mathematical formula (2), substitute in at least two sets of actual measured values of the residual chlorine concentration at the inlet of the rejuvenator and the residual chlorine concentration at the outlet to calculate a plurality of reaction rate constants k. Here, as the residual chlorine concentration of the water outlet, the residual chlorine concentration after standing for a predetermined time (for example, 4 minutes) can also be used based on the residual chlorine concentration at the inlet of the rehydrator substituted into the mathematical formula (2).

Step 2: Substituting the plurality of k obtained in the first step and the water temperature of the water recombiner outlet or drain outlet corresponding to each k into the mathematical formula (6), and calculate A and B respectively.

In the third step, the coefficients A and B obtained in the second step and the current water temperature at the outlet or drain of the rejuvenator are substituted into equation (6) to calculate the reaction rate constant k.

In the fourth step, use the reaction rate constant k and the residual chlorine concentration at the inlet of the rehydrator to predict the residual chlorine concentration at the water outlet.

According to the chlorine injection concentration management device of the above embodiment, the following effects can be achieved.

(1) As described above, the chlorine injection concentration management device of the above embodiment is a chlorine injection concentration management device that uses seawater in a factory. It includes a data acquisition unit 111 for acquiring group data, that is, from a factory that uses seawater, The injection rate of chlorine injected into the chlorine injection port and the residual chlorine concentration at the inlet of the rehydrator installed in the seawater plant after a specified time from the injection; the relational calculation unit 112, based on at least two sets of data of the injection rate and the residual chlorine concentration, The relationship between the injection rate and the residual chlorine concentration is approximated by an index; the target concentration obtaining part 113 is used to obtain the target value of the residual chlorine concentration; and the optimal chlorine injection rate calculation part 114 is known according to the target value and the approximate index of the residual chlorine concentration The relationship is used to calculate the best value of the injection rate. As a result, compared with the conventional technology, the residual chlorine concentration at the inlet of the rehydration device can be made to meet the target value without cumbersome procedures.

(2) As described above, the chlorine injection concentration management device of the above embodiment further includes a residual chlorine analysis unit 12 that continuously measures the residual chlorine concentration at the inlet of the water rehydrator, and then outputs the actual measured value of the residual chlorine concentration to the Data Acquisition Department. Thereby, the user of the chlorine injection concentration management device can automatically measure the residual chlorine concentration at the inlet of the rehydration device without manual analysis.

(3) As described above, the chlorine injection concentration management device of the above-mentioned embodiment further includes: a predicted value calculation unit 115 that calculates the water temperature at the outlet or drain of the rejuvenator based on the target value of the residual chlorine concentration The predicted value of residual chlorine concentration at the outlet of the sea water factory. In this way, the user of the chlorine injection concentration management device can grasp the optimal injection rate, that is, maintain the residual chlorine concentration of the water outlet at the environmental protection agreement value.

(4) As described above, the chlorine injection concentration management device of the above embodiment further includes: a second residual chlorine analysis unit 14 for continuously measuring the residual chlorine concentration of the drain; and an alarm unit 15 when the second When the difference between the residual chlorine concentration measured by the residual chlorine analysis unit 14 and the predicted value exceeds a predetermined value, an alarm is issued. In this way, the user of the chlorine injection concentration management device, in order to achieve the predicted value of the residual chlorine concentration at the outlet, while injecting chlorine at the optimal injection rate, there is a difference between the actual measured value of the residual chlorine concentration at the outlet and the predicted value. When the deviation exceeds a certain level, the deviation can be identified. When the identification is deviated, the target value of the inlet of the water recovery device must be revised again.

[4 Modifications] Although the above-mentioned embodiment is the best embodiment of the present invention, it does not limit the scope of the present invention to the above-mentioned embodiment, and various changes can be made to the embodiment without departing from the scope of the present invention.

[4.1 Modification 1] The chlorine injection concentration management device 1 of the first embodiment includes a residual chlorine analysis unit 12, and the chlorine injection concentration management device 1A of the second embodiment further includes a second residual chlorine analysis unit 14, but it is not limited to this, for example: The residual chlorine analysis unit 12 and/or the second residual chlorine analysis unit 14 are regarded as essential components. However, the user of the chlorine injection concentration management device 1 or 1A, for example, the chlorine injection concentration management device 1 or 1A, is also acceptable. Manually input the residual chlorine concentration measured by manual analysis.

[4.2 Modification 2] The relationship calculation unit 112 of the chlorine injection concentration management device 1 of the first embodiment and the chlorine injection concentration management device 1A of the second embodiment is based on at least the two sets of chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator. The relationship between the chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator is approximately exponential, but not limited to this. For example, the relational calculation unit 112 can also be based on a set of data on the chlorine injection rate and the residual chlorine concentration at the inlet of the rehydrator, the zero point, that is, the data on which both the injection rate and the residual chlorine concentration are zero, or the injection rate Zero, the residual chlorine concentration is the specified value (for example, 0.01mg/L), so that the above relationship approximates the index.

The management method of the chlorine injection concentration management device 1 or 1A can be realized by software. When implemented by software, the program constituting the software is installed in the computer (chlorine injection concentration management device 1 or 1A). In addition, these programs can also be recorded on removable media and then distributed to users, or downloaded to users’ computers via the Internet for distribution. Furthermore, these programs can also be provided to the user's computer (chlorine injection concentration management device 1 or 1A) via the Internet as a web service without downloading these programs.

1. 1A: Chlorine injection concentration management device 11.11A: Control Department 12: Residual Chlorine Analysis Department 13: Memory Department 14: The second residual chlorine analysis department 15, 116: Alarm Department 111: Data Acquisition Department 112: Relational Calculation Department 113: Target Concentration Acquisition Department 114: Optimum chlorine injection rate calculation section 115: Predicted value calculation section

Fig. 1 is a functional block diagram of a chlorine injection concentration management device according to an embodiment of the present invention. Fig. 2 is a diagram showing an example of a GUI (Graphical User Interface) displayed by the chlorine injection concentration management device according to the embodiment of the present invention. Fig. 3 is a flowchart showing the operation of the chlorine injection concentration management device according to the embodiment of the present invention. Fig. 4A is a graph showing the time-series variation of the injection rate and the concentration of residual chlorine at the inlet of the rehydration device used as experimental data of the present invention. Fig. 4B is a graph showing the time-series variation of the injection rate and the residual chlorine concentration at the inlet of the rehydration device used as experimental data of the present invention. Fig. 4C is a graph showing the time-series variation of the injection rate and the residual chlorine concentration at the inlet of the rehydration device used as experimental data of the present invention. Fig. 4D is a graph showing the time-series variation of the injection rate and the residual chlorine concentration at the inlet of the rehydration device used as experimental data of the present invention. Fig. 5 is a graph showing the relationship between the injection rate and the concentration of residual chlorine at the inlet of the rehydration device as the experimental data of the present invention. Fig. 6A is a graph showing the relationship between the injection rate and the residual chlorine concentration at the inlet of the rehydration device as the experimental data of the present invention. Fig. 6B is a graph showing the relationship between the injection rate and the concentration of residual chlorine at the inlet of the rehydration device as the experimental data of the present invention. Fig. 6C is a graph showing the relationship between the injection rate and the concentration of residual chlorine at the inlet of the rehydration device as the experimental data of the present invention. Fig. 7 is a functional block diagram showing the chlorine injection concentration management device according to the embodiment of the present invention.

1: Chlorine injection concentration management device

11: Control Department

12: Residual Chlorine Analysis Department

13: Memory Department

111: Data Acquisition Department

112: Relational Calculation Department

113: Target Concentration Acquisition Department

114: Optimum chlorine injection rate calculation section

Claims (6)

A chlorine injection concentration management device, which is a chlorine injection concentration management device using seawater in a factory, including: The data acquisition department is used to acquire group data, that is, the injection rate of chlorine (sodium hypochlorite) injected from the chlorine injection port of the seawater utilization plant, and the injection rate of the chlorine (sodium hypochlorite) installed in the seawater utilization plant after a prescribed period of time. Concentration of residual chlorine at the inlet; The relationship calculation part, based on at least two sets of the injection rate and the residual chlorine concentration data, makes the relationship between the injection rate and the residual chlorine concentration approximate an index; The target concentration obtaining part is used to obtain the target value of the residual chlorine concentration; and The optimal chlorine injection rate calculation unit calculates the optimal value of the injection rate based on the relationship between the target value of the residual chlorine concentration and the approximate index. The chlorine injection concentration management device according to item 1, which further comprises: a residual chlorine analysis unit, which continuously measures the residual chlorine concentration at the inlet of the water recombiner, and outputs the actual measured value of the residual chlorine concentration to the data Get the department. The chlorine injection concentration management device described in item 1 or 2, further comprising: a predicted value calculation unit, which calculates based on the target value of the residual chlorine concentration and the water temperature at the outlet or drain of the rehydrator The predicted value of residual chlorine concentration at the outlet of the seawater utilization plant. The chlorine injection concentration management device as described in item 3, which further comprises: The second residual chlorine analysis part is used to continuously measure the residual chlorine concentration of the drain; and The alarm unit issues an alarm when the difference between the residual chlorine concentration measured by the second residual chlorine analysis unit and the predicted value exceeds a predetermined value. A chlorine injection concentration management method, which is the chlorine injection concentration management method of the factory using seawater, including: The data acquisition step is used to acquire group data, that is, the chlorine injection rate injected from the chlorine injection port of the seawater utilization plant, and the residual chlorine that is installed at the inlet of the rewaterer in the seawater utilization plant after a specified time from the injection concentration; The relationship calculation step is to make the relationship between the injection rate and the residual chlorine concentration approximate an index based on at least two sets of the injection rate and the residual chlorine concentration data; The target concentration obtaining step is used to obtain the target value of the residual chlorine concentration; and The optimal chlorine injection rate calculation step is to calculate the optimal value of the injection rate based on the relationship between the target value of the residual chlorine concentration and the approximate index. A chlorine injection concentration management program. This is the chlorine injection concentration management program of the factory using seawater to make the computer perform the following steps: The data acquisition step is used to acquire group data, that is, the chlorine injection rate injected from the chlorine injection port of the seawater utilization plant, and the residues at the inlet of the rehydrator installed in the seawater utilization plant after a specified time from the injection Chlorine concentration The relationship calculation step is to make the relationship between the injection rate and the residual chlorine concentration approximate an index based on at least two sets of the injection rate and the residual chlorine concentration data; The target concentration obtaining step is used to obtain the target value of the residual chlorine concentration; and The optimal chlorine injection rate calculation step is to calculate the optimal value of the injection rate based on the relationship between the target value of the residual chlorine concentration and the approximate index.

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