Circulating cooling water system and its agent concentration control device

Abstract

The present disclosure relates to a circulating cooling water system and a medicament concentration control device thereof, which comprises a medicament concentration measuring unit, a water quality measuring unit, a medicament adding unit and a control unit. The medicament concentration measuring unit and the water quality measuring unit are used for online detection of the medicament concentration information and the water quality information of the circulating cooling water; the control unit is used for receiving the medicament concentration information and the water quality information of the medicament concentration measuring unit and the water quality measuring unit, and controlling the medicament adding unit to add medicament into the circulating cooling water according to the medicament concentration information and the water quality information. The medicament concentration control device can realize online monitoring of the medicament concentration information and timely adjustment to achieve accurate control of the medicament.

Description

Technical Field

[0001] This disclosure relates to the field of circulating cooling water system technology, and more specifically, to a circulating cooling water system and a reagent concentration control device thereof. Background Technology

[0002] Circulating cooling water systems are widely used in heat exchange in industrial fields. The circulating water typically uses fresh water or recycled wastewater as makeup water. To prevent corrosion and scaling in the circulating pipes and equipment, and to prevent the growth and reproduction of microorganisms, scale inhibitors and corrosion inhibitors, as well as oxidizing biocides, need to be added to the system.

[0003] In related technologies, the control of the concentration of scale inhibitors, corrosion inhibitors and oxidizing biocides in circulating water generally requires manual sampling and analysis, followed by adjustment of the dosing device based on the test results. Due to limitations in the frequency and time of analysis, there is a lag in the adjustment of the agent concentration, resulting in unstable agent concentration control. Utility Model Content

[0004] The purpose of this disclosure is to provide a circulating cooling water system and a chemical concentration control device thereof, which can realize online monitoring of chemical concentration information and timely adjustment to achieve accurate control of the chemical.

[0005] To achieve the above objectives, according to a first aspect of this disclosure, a reagent concentration control device for a circulating cooling water system is provided, comprising:

[0006] The reagent concentration measuring unit is used to detect the reagent concentration information of the circulating cooling water online;

[0007] The water quality measurement unit is used for online detection of water quality information of circulating cooling water;

[0008] A dosing unit for adding chemicals to the circulating cooling water; and

[0009] The control unit is communicatively connected to the reagent concentration measuring unit, the water quality measuring unit, and the dosing unit, respectively.

[0010] Optionally, the reagent concentration measuring unit and the water quality measuring unit are respectively connected to the return water pipeline of the circulating cooling water system.

[0011] Optionally, the reagent concentration measuring unit includes at least one of an online scale and corrosion inhibitor concentration analyzer, an online free chlorine concentration analyzer, and an online redox potential monitor.

[0012] Optionally, the water quality measurement unit includes an online conductivity analyzer and / or an online iron ion analyzer.

[0013] Optionally, the control unit includes a receiving module, a computing module, a control module, a storage module, and a communication module;

[0014] The receiving module is used to receive detection information, which includes the reagent concentration information, the water quality information, and the flow rate information of the sewage pump of the circulating cooling water system.

[0015] The calculation module is used to calculate the dosage information of the reagent based on the detection information;

[0016] The control module is used to convert the drug dosage information calculated by the calculation module into control commands; the storage module is used to store all detection information and drug dosage information.

[0017] The communication module is used to transmit the dosage information of the agent to the dosing unit;

[0018] and / or

[0019] The control unit also includes an early warning module; the early warning module is used to compare the reagent concentration in the detection information with the reagent dosage information and the reagent concentration calculated from the discharge volume, and to issue an early warning when the difference between the two is greater than a preset difference.

[0020] Optionally, the dosing unit includes a scale and corrosion inhibitor storage tank and a scale and corrosion inhibitor dosing pump;

[0021] The scale and corrosion inhibitor storage tank is connected to the circulating water suction pool of the circulating cooling water system through the scale and corrosion inhibitor pipeline, and the scale and corrosion inhibitor dosing pump is located in the scale and corrosion inhibitor pipeline.

[0022] and / or

[0023] The dosing device includes an oxidizing biocide storage tank and an oxidizing biocide dosing pump;

[0024] The oxidizing biocide storage tank is connected to the circulating water intake pool of the circulating cooling water system via an oxidizing biocide pipeline, and the oxidizing biocide dosing pump is located in the oxidizing biocide pipeline.

[0025] Optionally, the reagent concentration control device further includes a water inlet pipe, one end of which is connected to the reagent concentration measuring unit and the water quality measuring unit respectively; the other end is used to connect to the return water pipe of the circulating cooling water system.

[0026] The inlet pipe is equipped with a filter and a flow meter.

[0027] Optionally, the water inlet pipeline includes a first branch, a second branch, and a connecting branch;

[0028] The first branch and the second branch are connected in parallel and then connected to one end of the connecting branch. The other end of the connecting branch is connected to the reagent concentration measuring unit and the water quality measuring unit, respectively.

[0029] Valves and filters are respectively installed on the first branch and the second branch;

[0030] The flow meter is located on the connecting branch.

[0031] Optionally, the reagent concentration control device further includes a bracket with casters at the bottom, and the reagent concentration measuring unit, the water quality measuring unit, at least part of the dosing unit and the control unit are all located on the bracket;

[0032] or

[0033] The reagent concentration control device also includes a housing with casters at the bottom, and the reagent concentration measuring unit, the water quality measuring unit, at least part of the dosing unit and the control unit are all located inside the housing.

[0034] According to a second aspect of this disclosure, a circulating cooling water system is also provided, including the aforementioned reagent concentration control device.

[0035] The above-described technical solution, namely the chemical concentration control device for a circulating cooling water system disclosed herein, comprises a chemical concentration measuring unit, a water quality measuring unit, a dosing unit, and a control unit. The chemical concentration measuring unit and the water quality measuring unit are used to detect the chemical concentration and water quality information of the circulating cooling water online. The control unit receives the chemical concentration and water quality information from the chemical concentration measuring unit and the water quality measuring unit, and controls the dosing unit to add chemicals to the circulating cooling water based on the chemical concentration and water quality information. This chemical concentration control device overcomes the problem that existing circulating cooling water chemical concentration control devices cannot accurately and timely measure the chemical concentration information and make timely adjustments. This chemical concentration control device can realize online monitoring and timely adjustment of chemical concentration information (e.g., scale inhibitors, corrosion inhibitors, and oxidizing biocides) to achieve accurate control of the chemicals.

[0036] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a drug concentration control device provided in some embodiments of this disclosure;

[0039] Figure 2 This is a front view structural diagram of the housing of the drug concentration control device provided in some embodiments of this disclosure;

[0040] Figure 3 This is a right-side structural view of the housing of the drug concentration control device provided in some embodiments of this disclosure;

[0041] Figure 4 This is a left view of the housing of the drug concentration control device provided in some embodiments of this disclosure;

[0042] Figure 5 This is a structural diagram of the support for a drug concentration control device provided in other embodiments of this disclosure.

[0043] Explanation of reference numerals in the attached figures

[0044] 10-Reagent concentration control device; 100-Reagent concentration measuring unit; 110-Scale and corrosion inhibitor online concentration analyzer; 120-Free chlorine concentration online analyzer; 130-Inlet water pipeline; 130a-Valve; 130b-Filter; 131-First branch; 132-Second branch; 140-Connecting branch; 141-Flow meter;

[0045] 200 - Water quality testing unit; 210 - Online conductivity analyzer; 220 - Online iron ion analyzer;

[0046] 300 - Dosing unit; 310 - Scale and corrosion inhibitor dosing pump; 320 - Scale and corrosion inhibitor storage tank; 330 - Oxidizing biocide dosing pump; 340 - Oxidizing biocide storage tank;

[0047] 400 - Control Unit;

[0048] 500 - Housing; 501 - Display screen; 502 - Control switch; 503 - Cable through hole; 504 - Water outlet; 505 - Scale and corrosion inhibitor inlet; 506 - Oxidizing agent inlet; 507 - Water inlet; 508 - Oxidizing agent outlet; 509 - Scale and corrosion inhibitor outlet; 510 - Casters;

[0049] 600-Standard;

[0050] 20 - Sewage pump. Detailed Implementation

[0051] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0052] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to upper, lower, left, and right relative to the figures; "inner" and "outer" refer to the inside and outside of the outline of the corresponding component; and "far" and "near" refer to the corresponding structure or component being away from or near another structure or component. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In addition, in the following description, when referring to the figures, unless otherwise explained, the same reference numerals in different figures denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0053] Open-loop circulating cooling water systems are widely used in heat exchange within industrial applications. These systems typically use fresh water or recycled wastewater as makeup water. The circulating water directly contacts the atmosphere, causing heat dissipation and leading to the continuous concentration of ions within the system, resulting in corrosion and scaling. Simultaneously, due to wastewater reuse and material leaks, the water contains a certain concentration of inorganic and organic nutrients, and the suitable temperature and pH conditions create ideal conditions for microbial growth and reproduction. To ensure the safe and stable operation of the circulating cooling water system, scale inhibitors, corrosion inhibitors, and oxidizing biocides need to be added. To achieve good water treatment results, it is essential to select highly efficient agents and control their concentrations within a stable range.

[0054] Currently, the operation of circulating cooling water systems has achieved continuous addition of scale inhibitors, corrosion inhibitors, and oxidizing biocides. However, concentration control generally requires manual sampling and analysis, followed by adjustment of the dosing device based on the test results. Due to limitations in analysis frequency and time, there is a lag in adjusting the concentration of the agents, resulting in unstable concentration control.

[0055] In summary, it is necessary to build an effective and timely device for measuring the concentration of scale inhibitors, corrosion inhibitors, and oxidizing biocides, and to accurately control the dosage of these agents.

[0056] The purpose of this disclosure is to provide a circulating cooling water system and a reagent concentration control device 10 thereof, which can realize online monitoring of reagent concentration information and timely adjustment to achieve accurate control of the reagent.

[0057] To achieve the above objectives, such as Figures 1 to 5As shown, according to a first aspect of this disclosure, a reagent concentration control device 10 for a circulating cooling water system is provided. The reagent concentration control device 10 includes a reagent concentration measuring unit 100, a water quality measuring unit 200, a dosing unit 300, and a control unit 400. The reagent concentration measuring unit 100 is used to detect the reagent concentration information of the circulating cooling water online; the water quality measuring unit 200 is used to detect the water quality information of the circulating cooling water online; the dosing unit 300 is used to add reagents to the circulating cooling water; the control unit 400 is communicatively connected to the reagent concentration measuring unit 100, the water quality measuring unit 200, and the dosing unit 300, respectively, and is used to receive the reagent concentration information and water quality information from the reagent concentration measuring unit 100 and the water quality measuring unit 200, and control the dosing unit 300 to add reagents to the circulating cooling water according to the reagent concentration information and water quality information.

[0058] The above-described technical solution, namely the chemical concentration control device 10 for a circulating cooling water system disclosed herein, comprises a chemical concentration measuring unit 100, a water quality measuring unit 200, a dosing unit 300, and a control unit 400. The chemical concentration measuring unit 100 and the water quality measuring unit 200 are used to detect the chemical concentration and water quality information of the circulating cooling water online. The control unit 400 receives the chemical concentration and water quality information from the chemical concentration measuring unit 100 and the water quality measuring unit 200, and controls the dosing unit 300 to add chemicals to the circulating cooling water based on the chemical concentration and water quality information. This chemical concentration control device 10 overcomes the problem that existing circulating cooling water chemical concentration control devices 10 cannot accurately and timely measure the concentration of chemicals and make timely adjustments. This chemical concentration control device 10 can realize online monitoring and timely adjustment of chemical concentration information (e.g., scale inhibitors, corrosion inhibitors, and oxidizing biocides) to achieve accurate control of the chemicals.

[0059] like Figure 1 As shown, in some embodiments, the reagent concentration measuring unit 100 and the water quality measuring unit 200 are respectively connected to the return water pipeline of the circulating cooling water system. This design allows the reagent concentration measuring unit 100 and the water quality measuring unit 200 to directly obtain the water sample to be tested from the return water pipeline of the circulating cooling water system, thereby achieving real-time and accurate monitoring of the circulating cooling water under actual operating conditions. By connecting the reagent concentration measuring unit and the water quality measuring unit 200 directly or indirectly to the return water pipeline, key data reflecting the current status of the circulating cooling water can be obtained in a timely manner without interfering with the normal operation of the system, providing accurate basis for subsequent water quality control and reagent addition. This connection method not only improves the convenience and timeliness of monitoring, but also effectively reduces sampling errors, ensures the reliability of monitoring data, and thus improves the stability and economy of the entire circulating cooling water system.

[0060] It should be noted that the reagent concentration measuring unit 100 and the water quality measuring unit 200 can also draw water from the circulating water intake tank, provided that a corresponding water intake pump and pipeline are configured.

[0061] Optionally, the reagent concentration measuring unit 100 includes at least one of an online analyzer for scale and corrosion inhibitor concentration 110, an online analyzer for free chlorine concentration 120, and an online monitoring instrument for oxidation-reduction potential. The reagent concentration measuring unit 100 may include an online analyzer for scale and corrosion inhibitor concentration 110, an online analyzer for free chlorine concentration 120, or an online monitoring instrument for oxidation-reduction potential, etc. The reagent concentration measuring unit 100 connects to an inlet pipe 130 from the return water main of the circulating cooling water system, and a filter 130b is installed on the inlet pipe 130. After being detected by the measuring unit (e.g., the online analyzer for scale and corrosion inhibitor concentration 110), the effluent is returned to the circulating water tank.

[0062] The online scale and corrosion inhibitor concentration analyzer 110 utilizes a method that reacts a cationic surfactant with the core polymer in the scale and corrosion inhibitor to determine its concentration. A preferred method involves selecting a calcium ion complexing agent and optionally a trivalent ion as a masking agent based on the colorimetric reaction between the cationic surfactant and the polymer. This effectively masks interference from calcium hardness, iron ions, and conductivity, allowing for accurate and sensitive determination of the scale and corrosion inhibitor concentration in the circulating water. The scale and corrosion inhibitor is selected from at least one of carboxylate polymers, sulfonate polymers, and allyloxy polyethylene glycol polymers.

[0063] An online free chlorine concentration analyzer 120 or an online redox potential monitor is used to monitor the concentration of oxidizing biocides in circulating water, with the online free chlorine concentration analyzer 120 being preferred. The online free chlorine analyzer operates on the principle of a colorimetric reaction between free chlorine and a specific reagent (such as N,N-diethyl-p-phenylenediamine).

[0064] like Figure 1 As shown, in some embodiments, the water quality measuring unit 200 includes an online conductivity analyzer 210 and / or an online iron ion analyzer 220. The water quality measuring unit 200 may include the online conductivity analyzer 210, and of course, it may also include the online iron ion analyzer 220, etc.

[0065] The water quality measuring unit 200 can also be connected to a branch from the return water main of the circulating cooling water system, and can share a water inlet pipe 130 with the reagent concentration measuring unit 100. The circulating water to be tested can be introduced into the corresponding analyzer through different branches.

[0066] It should be noted that the online free chlorine concentration analyzer 120, or the online redox potential monitor, the online conductivity analyzer 210, and the online iron ion analyzer 220, can be commercially available products with this function.

[0067] The control unit 400 can be constructed using any suitable structure to receive online detection information, receive discharge information from the sewage pump 20, send instructions to the dosing pump and the sewage pump 20, and has calculation, storage, and judgment functions. Optionally, the control unit 400 includes a receiving module, a calculation module, a control module, a storage module, and a communication module. The control unit 400 is communicatively connected to the reagent concentration measuring unit 100 and the water quality measuring unit 200. The receiving module receives detection information, including reagent concentration information, water quality information, and flow rate information of the sewage pump 20 in the circulating cooling water system; the calculation module calculates the reagent dosage information based on the detection information; the control module converts the reagent dosage information calculated by the calculation module into control commands; the storage module stores all detection information and reagent dosage information; and the communication module transmits the reagent dosage information to the dosing unit 300 via wired or wireless means.

[0068] In other embodiments, the control unit 400 includes a receiving module, a calculation module, a control module, a storage module, and a communication module. The calculation module is used to calculate whether the dosage of the pesticide is within the control range based on the detection data. The control unit 400 includes an early warning module, which compares the pesticide concentration in the detection information with the pesticide concentration calculated from the pesticide dosage information and the discharge volume. An early warning is issued when the difference between the two is greater than a preset difference. It is understood that the preset difference can be 10%, 15%, or 20%, etc. Those skilled in the art can make specific adjustments based on the implementation, which will not be elaborated here.

[0069] It should be noted that the calculation module can also correct the results measured by the online scale and corrosion inhibitor concentration analyzer 110 based on the online measured conductivity and iron ion mass concentration. The calculation module has a built-in correction formula for the measurement results of the online scale and corrosion inhibitor concentration analyzer, using conductivity and iron ion mass concentration as variables.

[0070] To enable the addition of scale and corrosion inhibitors to the circulating water intake tank of the circulating cooling water system, such as Figure 1As shown, in some embodiments, the dosing unit 300 includes a scale and corrosion inhibitor storage tank 320 and a scale and corrosion inhibitor dosing pump 310. The scale and corrosion inhibitor storage tank 320 is connected to the circulating water intake pool of the circulating cooling water system via a scale and corrosion inhibitor pipeline, and the scale and corrosion inhibitor dosing pump 310 is located on the scale and corrosion inhibitor pipeline. The scale and corrosion inhibitor dosing pump 310 is communicatively connected to a control unit 400. The control unit 400 sends a dosing command to the scale and corrosion inhibitor dosing pump 310, which operates according to the dosing command, thereby adding the scale and corrosion inhibitor from the scale and corrosion inhibitor storage tank 320 to the circulating water intake pool.

[0071] To add oxidizing biocide to the circulating water intake pool of the circulating cooling water system, in some embodiments, the dosing unit 300 further includes an oxidizing biocide storage tank 340 and an oxidizing biocide dosing pump 330. The oxidizing biocide storage tank 340 is connected to the circulating water intake pool of the circulating cooling water system via an oxidizing biocide pipeline, and the oxidizing biocide dosing pump 330 is located on the oxidizing biocide pipeline. The oxidizing biocide dosing pump 330 is communicatively connected to a control unit 400. The control unit 400 sends a dosing command to the oxidizing biocide dosing pump 330, which operates according to the dosing command, thereby adding the oxidizing biocide from the oxidizing biocide storage tank 340 to the circulating water intake pool.

[0072] In order to introduce the circulating water from the return water pipeline into the above-mentioned reagent concentration measuring unit 100 and water quality measuring unit 200, in some embodiments, the reagent concentration control device 10 further includes an inlet pipe 130. One end (outlet end) of the inlet pipe 130 is connected to the reagent concentration measuring unit 100 and the water quality measuring unit 200 respectively; the other end (inlet end) is used to connect to the return water pipeline of the circulating cooling water system; so as to introduce the circulating water from the return water pipeline into the reagent concentration measuring unit 100 and the water quality measuring unit 200 for detection. The detected circulating water can be sent to the circulating water intake pool or the drainage circulating cooling water system through the outlet pipe.

[0073] It should be noted that, in order to filter and control the flow of circulating water entering the reagent concentration measuring unit 100 and the water quality measuring unit 200, a filter 130b and a flow meter 141 are installed on the inlet pipe 130. The filter 130b is mainly used to filter out conductive substances in the circulating water to prevent them from entering the measuring unit and clogging or damaging it.

[0074] like Figure 1As shown, in some embodiments, the inlet pipe 130 may include a first branch 131, a second branch 132, and a connecting branch 140. The first branch 131 and the second branch 132 are connected in parallel to one end of the connecting branch 140, and the other end of the connecting branch 140 is connected to the reagent concentration measuring unit 100 and the water quality measuring unit 200, respectively. Valves and filters 130b are respectively provided on the first branch 131 and the second branch 132. A flow meter 141 is provided on the connecting branch 140. The first branch 131 and the second branch 132 are connected in parallel, giving the inlet pipe 130 two independent water flow channels, one for use and one for backup. In actual operation, when one branch needs maintenance or fails, the other branch can continue to work, ensuring the continuity and stability of the system and improving the reliability and availability of the entire water supply system.

[0075] Valves 130a and filters 130b are respectively installed on the first branch 131 and the second branch 132. Valves 130a can flexibly control the opening and closing of each branch. For example, when repairing or cleaning a branch, only the valve 130a on the corresponding branch needs to be closed, without affecting the normal operation of the other branch. Furthermore, the filters 130b on each branch can effectively intercept impurities and particulate matter in the water, preventing these impurities from entering the subsequent reagent concentration measurement unit 100 and water quality measurement unit 200, protecting the measuring equipment from damage, extending its service life, and ensuring the accuracy and reliability of the measurement results.

[0076] Connecting branch 140 collects the water flow from the parallel connection of first branch 131 and second branch 132, and guides it to the reagent concentration measuring unit 100 and the water quality measuring unit 200. The flow meter 141 installed on connecting branch 140 can accurately measure the water flow through this pipeline, providing accurate flow data support for reagent dosage control and water quality analysis. This helps to achieve precise reagent dosing and water quality monitoring, improving the efficiency and effectiveness of the entire system.

[0077] To improve the ease of use of the drug concentration control device 10, such as Figure 5 As shown, in some embodiments, the drug concentration control device 10 further includes a bracket 600 with casters 510 at the bottom, and the drug concentration measuring unit 100, the water quality measuring unit 200, at least part of the dosing unit 300 and the control unit 400 are all located on the bracket 600.

[0078] In the reagent concentration control device 10, a bracket 600 equipped with casters 510 at the bottom provides stable support for the four key components: the reagent concentration measuring unit 100, the water quality measuring unit 200, at least a portion of the dosing unit 300 (e.g., a dosing pump), and the control unit 400. This design makes the entire device more compact and efficient, significantly improving its convenience and flexibility in actual operation. When the concentration of the reagent solution at different locations needs to be detected and controlled, operators can easily move the entire device to the target location using the casters 510, eliminating the need for tedious disassembly and reassembly, thus significantly improving work efficiency and reducing operational difficulty and time costs. Furthermore, concentrating these functional units on the same bracket 600 facilitates signal transmission and collaborative work between the units, ensuring the accuracy and stability of the entire reagent concentration control process and further enhancing the overall performance and reliability of the device.

[0079] To improve both the ease of use and safety of the drug concentration control device 10. For example... Figure 2 , Figure 3 and Figure 4 As shown, in some other embodiments, the drug concentration control device 10 also includes a housing 500 with casters 510 at the bottom, and the drug concentration measuring unit, water quality measuring unit 200, at least part of the dosing unit 300 and control unit 400 are all located inside the housing 500.

[0080] The reagent concentration control device 10 includes a housing 500 with casters 510 mounted on the bottom. This design feature gives the entire device excellent mobility, allowing it to be moved flexibly according to actual needs. Whether in an open industrial workshop, a space-constrained experimental area, or a special scenario where the work site needs to be changed frequently, the device can be ensured to operate stably and efficiently, greatly expanding the applicability of the device, improving work efficiency, and reducing many limitations and inconveniences caused by fixed location.

[0081] By arranging the agent concentration measuring unit, water quality measuring unit 200, at least part of the dosing unit 300, and control unit 400 inside the housing 500, an integrated design of multiple measuring units and control unit 400 is achieved. This optimizes the spatial layout, ensures close connection and coordinated operation between components, and significantly improves the convenience and consistency of operation. Simultaneously, the housing 500 can withstand the influence of the external environment on the measuring units or control unit 400; for example, it can prevent rainwater and dust, ensuring the stability and reliability of the agent preparation and use process.

[0082] To facilitate the entry and exit of water, chemicals, and other substances, corresponding inlet and outlet ports can be installed on the casing 500 to meet the requirements for pipeline connection and wiring.

[0083] The control unit 400 can also communicate with the sewage pump 20 of the circulating cooling water system to control the operation of the sewage pump 20.

[0084] It should be noted that in some embodiments, the housing 500 is provided with an inlet 507 and an outlet 504 connected to the circulating cooling water system, a drug inlet and a drug outlet connected to the drug tank, and a cable through-hole 503 connected to the sewage pump 20, the control unit 400 (e.g., DCS), the power supply, etc. The housing 500 may also be provided with a touch screen display 501 for displaying measured drug concentration, drug dosage, warning information, etc., and can be used to input relevant set parameters. The housing 500 may also be provided with a control switch 502 for controlling the drug pump, etc.

[0085] In one embodiment of this disclosure, the reagent concentration control device 10, excluding the reagent tank, can be centrally housed within a housing 500 or control cabinet. When housed within the housing 500, the housing 500 is equipped with an inlet 507, an outlet 504, a scale and corrosion inhibitor inlet 505, an oxidizing agent inlet 506, a scale and corrosion inhibitor outlet 509, and an oxidizing agent outlet 508, all connected to the circulating water treatment system, as well as cable through-holes 503 for connection to the sewage pump 20, DCS, power supply, etc. If the device requires explosion protection, a nitrogen inlet and outlet must also be provided on the housing 500. The cabinet is equipped with a touch screen 501, which displays the measured reagent concentration, reagent dosage, warning information, etc., and can be used to input relevant set parameters.

[0086] like Figure 1As shown, the inlet pipe 130 of the reagent concentration control device 10 is connected to the return water main of the circulating cooling water system. Circulating water enters the filter 130b of the first branch 131 or the second branch 132 through the inlet pipe 130. The first branch 131 and the second branch 132, along with their respective filters 130b, are used in one and have backup in the other. The effluent passes through the flow meter 141 and then enters the reagent concentration measuring unit 100 and the water quality measuring unit 200, respectively. The remaining water is returned to the circulating water tank. The reagent concentration measuring unit 100 includes an online analyzer for scale and corrosion inhibitor concentration 110 and an online analyzer for free chlorine concentration 120; the water quality measuring unit 200 includes an online conductivity analyzer 210 and an online iron ion analyzer 220. The scale and corrosion inhibitor concentration online analyzer 110 measures the mass concentration of the scale and corrosion inhibitor, and the free chlorine concentration online analyzer 120 measures the mass concentration of free chlorine; the conductivity online analyzer 210 measures conductivity, and the iron ion online analyzer 220 measures the iron ion mass concentration. The reagent concentration measuring unit 100 and the water quality measuring unit 200 are communicatively connected to the control unit 400. The measured data is transmitted to the control unit 400. After receiving the data, the control unit 400 corrects the polymer concentration based on the conductivity and iron ion mass concentration; and determines whether the corrected polymer concentration and the measured free chlorine mass concentration are within the control range. If they are not within the range, it calculates the flow rate of the dosing pump that needs adjustment and sends the command to the dosing unit 300. The dosing unit 300 includes a scale and corrosion inhibitor dosing pump 310 and a corresponding scale and corrosion inhibitor storage tank 320, as well as an oxidizing biocide dosing pump 330 and an oxidizing biocide storage tank 340. It should be noted that the scale and corrosion inhibitor dosing pump 310 and the oxidizing biocide dosing pump 330 can also be used in a one-to-one standby configuration. When one of them needs maintenance, the other is activated to reduce downtime for maintenance.

[0087] Meanwhile, the sewage pump 20 and the dosing pumps (including the scale and corrosion inhibitor dosing pump 310 and the oxidizing biocide dosing pump 330) transmit the accumulated flow to the control unit 400. The control unit 400 calculates the added agent concentration based on the dosing amount and sewage discharge. If the difference from the agent concentration measuring unit 100 is greater than 10%, an early warning is issued, and suggestions are given to calibrate the agent concentration measuring unit 100 or check whether the system has leaked.

[0088] In one embodiment, a circulating cooling water system needs to control the scale and corrosion inhibitor concentration to 60-80 mg / L and the free chlorine concentration to 0.1-0.5 mg / L. The scale and corrosion inhibitor concentration in the circulating water is measured to be 54.64 mg / L by an online scale and corrosion inhibitor concentration analyzer 110, and the free chlorine concentration is measured to be 0.2 mg / L by an online free chlorine concentration analyzer 120. The iron ion concentration in the circulating water is measured to be 0.32 mg / L by a water quality testing unit 200, and the conductivity is 1206 μS / cm. The control unit 400, combining the iron ion concentration and conductivity data, corrects the scale and corrosion inhibitor concentration measurement results using an embedded formula, resulting in a corrected concentration of 58.7 mg / L. Since the scale and corrosion inhibitor concentration is not within the 60-80 mg / L range, the adjusted dosing pump flow rate is calculated using an embedded flow-concentration formula, and the command is sent to the dosing unit 300.

[0089] According to a second aspect of this disclosure, a circulating cooling water system is also provided, comprising a circulating water intake tank, a sewage pump 20, and the aforementioned chemical concentration control device 10. The inlet pipe 130 of the chemical concentration control device 10 is connected to the return pipe of the circulating cooling water system, and sends filtered circulating water to the chemical concentration control device 10 and the water quality testing unit 200 for testing. The remaining circulating water is returned to the circulating water intake tank. Upon receiving the test information, the control unit 400 controls the dosing unit 300 to add scale inhibitors and corrosion inhibitors and oxidizing biocides to the circulating water intake tank. Therefore, this circulating cooling water system also possesses all the advantages of the chemical concentration control device 10.

[0090] The circulating cooling water system disclosed herein and its chemical concentration control device 10 measure the concentration of scale inhibitor and corrosion inhibitor and the concentration of free chlorine in the circulating water, calculate and correct the measured data using the control unit 400, compare whether the chemical concentration is within the control range, issue an instruction to the dosing unit 300 based on the comparison result, and promptly issue an early warning for inaccurate data, thereby achieving accurate dosing of scale inhibitor and corrosion inhibitor and oxidizing biocide.

[0091] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0092] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0093] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A reagent concentration control device for a circulating cooling water system, characterized in that, include: The reagent concentration measuring unit is used to detect the reagent concentration information of the circulating cooling water online; The water quality measurement unit is used for online detection of water quality information of circulating cooling water; The dosing unit is used to add chemicals to the circulating cooling water; and The control unit is communicatively connected to the reagent concentration measuring unit, the water quality measuring unit, and the dosing unit, respectively. The reagent concentration measuring unit and the water quality measuring unit are respectively connected to the return water pipeline of the circulating cooling water system; The reagent concentration control device also includes a water inlet pipe, one end of which is connected to the reagent concentration measuring unit and the water quality measuring unit respectively; the other end is used to connect to the return water pipe of the circulating cooling water system; a filter and a flow meter are installed on the water inlet pipe; The water inlet pipeline includes a first branch, a second branch, and a connecting branch; The first branch and the second branch are connected in parallel and then connected to one end of the connecting branch. The other end of the connecting branch is connected to the reagent concentration measuring unit and the water quality measuring unit, respectively. Valves and filters are respectively installed on the first branch and the second branch; The flow meter is located on the connecting branch.

2. The drug concentration control device according to claim 1, characterized in that, The reagent concentration measuring unit includes at least one of the following: an online analyzer for scale and corrosion inhibitor concentration, an online analyzer for free chlorine concentration, and an online monitoring instrument for oxidation-reduction potential.

3. The drug concentration control device according to claim 1, characterized in that, The water quality measurement unit includes an online conductivity analyzer and / or an online iron ion analyzer.

4. The drug concentration control device according to claim 1, characterized in that, The control unit includes a receiving module, a computing module, a control module, a storage module, and a communication module; The receiving module is used to receive detection information, which includes the reagent concentration information, the water quality information, and the flow rate information of the sewage pump of the circulating cooling water system. The calculation module is used to calculate the dosage information of the reagent based on the detection information; The control module is used to convert the drug dosage information calculated by the calculation module into control commands; the storage module is used to store all detection information and drug dosage information. The communication module is used to transmit the dosage information of the agent to the dosing unit; and / or The control unit also includes an early warning module; the early warning module is used to compare the reagent concentration in the detection information with the reagent dosage information and the reagent concentration calculated from the discharge volume, and to issue an early warning when the difference between the two is greater than a preset difference.

5. The drug concentration control device according to claim 1, characterized in that, The dosing unit includes a scale and corrosion inhibitor storage tank and a scale and corrosion inhibitor dosing pump. The scale and corrosion inhibitor storage tank is connected to the circulating water suction pool of the circulating cooling water system through the scale and corrosion inhibitor pipeline, and the scale and corrosion inhibitor dosing pump is located in the scale and corrosion inhibitor pipeline. and / or The dosing unit includes an oxidizing biocide storage tank and an oxidizing biocide dosing pump; The oxidizing biocide storage tank is connected to the circulating water intake pool of the circulating cooling water system via an oxidizing biocide pipeline, and the oxidizing biocide dosing pump is located in the oxidizing biocide pipeline.

6. The drug concentration control device according to any one of claims 1-5, characterized in that, The reagent concentration control device also includes a bracket with casters at the bottom, and the reagent concentration measuring unit, the water quality measuring unit, at least part of the dosing unit and the control unit are all located on the bracket; or The reagent concentration control device also includes a housing with casters at the bottom, and the reagent concentration measuring unit, the water quality measuring unit, at least part of the dosing unit and the control unit are all located inside the housing.

7. A circulating cooling water system, characterized in that, Includes the drug concentration control device according to any one of claims 1-6.

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