Industrial circulating water multi-parameter online monitoring system and method

Abstract

The invention discloses an industrial circulating water multi-parameter on-line monitoring system and method, an outlet of a circulating water sample input pipeline is divided into two paths, one path is communicated with an inlet of a residual chlorine measuring unit through a second sample injection valve, and the other path is communicated with an outlet of a residual chlorine measuring unit through a second sample injection valve; the other path is communicated with an inlet of a fourth sample injection valve, an inlet of a fifth sample injection valve, an inlet of a sixth sample injection valve, an inlet of a seventh sample injection valve, an inlet of an eighth sample injection valve and an inlet of a blow-down valve through a third sample injection valve, a deep pretreatment module and a sterilization module, and an outlet of the fourth sample injection valve is communicated with an inlet of a conductivity measuring unit; an outlet of the fifth sample injection valve is communicated with an inlet of the pH measuring unit, an outlet of the sixth sample injection valve is communicated with an inlet of the hardness measuring unit, an outlet of the seventh sample injection valve is communicated with an inlet of the alkalinity measuring unit, and an outlet of the eighth sample injection valve is communicated with an inlet of the chloride ion measuring unit; the system and the method can accurately detect multiple parameters of the industrial circulating water on line.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality monitoring, and relates to an industrial circulating water multi-parameter online monitoring system and method. Background Art

[0002] The industrial circulating cooling water system is one of the important process systems to ensure the continuous and efficient production of power generation enterprises. In order to ensure the safe and stable operation of the circulating cooling water system, the key water quality indicators must be accurately monitored and controlled. GB / T50050-2017 "Industrial Circulating Cooling Water Treatment Design Specifications" and other standards have made clear provisions for the testing items of circulating cooling water, mainly including conductivity, pH value, hardness, alkalinity, chloride ions, residual chlorine, etc. At present, the hardness, alkalinity and chloride ion indicators of circulating cooling water are mainly analyzed by manual titration. However, manual analysis is labor-intensive and time-consuming, and the measurement results are affected by the skills and quality of personnel, and the accuracy is poor. At the same time, the data of manual analysis has a certain lag, and cannot reflect the changes in water quality in time, which is not conducive to guiding supervision and control and achieving optimized operation. At present, online hardness analyzers, online alkalinity analyzers and chloride ion analyzers and other related online chemical instruments have begun to appear on the market, but the use effect is poor.

[0003] The following problems are common in online monitoring systems for industrial circulating water: 1) There is a certain living environment for microorganisms in circulating water. After long-term operation, microbial colonies are often found attached to the pipelines, circulation pools and electrode surfaces of on-site online chemical instruments, which affects the measurement accuracy and has an adverse impact on chemical supervision and control; 2) There is a lack of effective pretreatment methods for circulating water measurement samples. For example, the presence of a certain color has a great impact on online chemical instruments based on optical measurement principles, such as online alkalinity and online hardness analyzers; 3) Currently, online circulating water monitoring instruments are installed in a scattered manner and have a short service life. The measurement accuracy is highly dependent on the maintenance level of on-site personnel. There is a lack of a circulating water multi-parameter online monitoring system and device that integrates multiple chemical indicators. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an industrial circulating water multi-parameter online monitoring system and method, which can accurately detect the multi-parameters of industrial circulating water online.

[0005] To achieve the above-mentioned object, the present invention discloses an industrial circulating water multi-parameter online monitoring system, comprising a circulating water sample input pipeline, a first injection valve, a second injection valve, a residual chlorine measuring unit, a photoelectric detection module, a third injection valve, a deep pretreatment module, a sterilization module, a fourth injection valve, a conductivity measuring unit, a fifth injection valve, a pH measuring unit, a sixth injection valve, a hardness measuring unit, a seventh injection valve, an alkalinity measuring unit, an eighth injection valve, a chloride ion measuring unit and a drain valve;

[0006] The outlet of the circulating water sample input pipeline is divided into two routes, one of which is connected to the inlet of the residual chlorine measuring unit through the second injection valve, and the other is connected to the inlet of the fourth injection valve, the inlet of the fifth injection valve, the inlet of the sixth injection valve, the inlet of the seventh injection valve, the inlet of the eighth injection valve and the inlet of the drain valve through the third injection valve, the deep pretreatment module and the sterilization module. The outlet of the fourth injection valve is connected to the inlet of the conductivity measuring unit, the outlet of the fifth injection valve is connected to the inlet of the pH measuring unit, the outlet of the sixth injection valve is connected to the inlet of the hardness measuring unit, the outlet of the seventh injection valve is connected to the inlet of the alkalinity measuring unit, and the outlet of the eighth injection valve is connected to the inlet of the chloride ion measuring unit.

[0007] Furthermore, photoelectric detection modules are provided on the outlet pipe of the residual chlorine measuring unit, the outlet pipe of the conductivity measuring unit, the outlet pipe of the pH measuring unit, the outlet pipe of the hardness measuring unit, the outlet pipe of the alkalinity measuring unit and the outlet pipe of the chloride ion measuring unit.

[0008] Furthermore, the data processing system is connected to the output end of the residual chlorine measuring unit, the output end of the conductivity measuring unit, the output end of the pH measuring unit, the output end of the hardness measuring unit, the output end of the alkalinity measuring unit and the output end of the chloride ion measuring unit.

[0009] Furthermore, the data processing system is connected to a centralized display unit.

[0010] Furthermore, the controller is connected to the first injection valve, the second injection valve, the third injection valve, the fourth injection valve, the fifth injection valve, the sixth injection valve, the seventh injection valve, the eighth injection valve and the drain valve.

[0011] Furthermore, the deep pretreatment module contains activated carbon filter material.

[0012] The multi-parameter online monitoring method for industrial circulating water of the present invention comprises:

[0013] Control the switches of the first injection valve, the second injection valve, the third injection valve, the fourth injection valve, the fifth injection valve, the sixth injection valve, the seventh injection valve and the eighth injection valve, so that the water sample enters the residual chlorine measurement unit, the conductivity measurement unit, the pH measurement unit, the hardness measurement unit, the alkalinity measurement unit and the chloride ion measurement unit respectively;

[0014] The residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample are detected respectively by the residual chlorine measuring unit, conductivity measuring unit, pH measuring unit, hardness measuring unit, alkalinity measuring unit and chloride ion measuring unit.

[0015] Furthermore, the data processing system is connected to the output end of the residual chlorine measuring unit, the output end of the conductivity measuring unit, the output end of the pH measuring unit, the output end of the hardness measuring unit, the output end of the alkalinity measuring unit and the output end of the chloride ion measuring unit.

[0016] Furthermore, the data processing system is connected to a centralized display unit.

[0017] Furthermore, photoelectric detection modules are provided on the outlet pipe of the residual chlorine measuring unit, the outlet pipe of the conductivity measuring unit, the outlet pipe of the pH measuring unit, the outlet pipe of the hardness measuring unit, the outlet pipe of the alkalinity measuring unit and the outlet pipe of the chloride ion measuring unit.

[0018] The present invention has the following beneficial effects:

[0019] During specific operation, the industrial circulating water multi-parameter online monitoring system and method described in the present invention controls the switches of the first injection valve, the second injection valve, the third injection valve, the fourth injection valve, the fifth injection valve, the sixth injection valve, the seventh injection valve and the eighth injection valve, and then respectively detects the residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample through the residual chlorine measurement unit, the conductivity measurement unit, the pH measurement unit, the hardness measurement unit, the alkalinity measurement unit and the chloride ion measurement unit, so as to realize simultaneous online and accurate monitoring of the residual chlorine, conductivity, pH value, hardness, alkalinity and chloride ion content of the industrial circulating water, with simple and convenient operation and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Among them, 1 is the first injection valve, 2 is the second injection valve, 3 is the residual chlorine measurement unit, 4 is the photoelectric detection module, 5 is the third injection valve, 6 is the deep pretreatment module, 7 is the sterilization module, 8 is the fourth injection valve, 9 is the conductivity measurement unit, 10 is the fifth injection valve, 11 is the pH measurement unit, 12 is the sixth injection valve, 13 is the hardness measurement unit, 14 is the seventh injection valve, 15 is the alkalinity measurement unit, 16 is the eighth injection valve, 17 is the chloride ion measurement unit, 18 is the drain valve, 19 is the data processing system, and 20 is the centralized display unit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0027] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0028] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] Embodiment 1

[0032] refer to Figure 1 The industrial circulating water multi-parameter online monitoring system of the present invention comprises a circulating water sample input pipeline, a first injection valve 1, a second injection valve 2, a residual chlorine measuring unit 3, a photoelectric detection module 4, a third injection valve 5, a deep pretreatment module 6, a sterilization module 7, a fourth injection valve 8, a conductivity measuring unit 9, a fifth injection valve 10, a pH measuring unit 11, a sixth injection valve 12, a hardness measuring unit 13, a seventh injection valve 14, an alkalinity measuring unit 15, an eighth injection valve 16, a chloride ion measuring unit 17, a drain valve 18, a data processing system 19 and a centralized display unit 20;

[0033] The outlet of the circulating water sample input pipeline is divided into two routes, one of which is connected to the inlet of the residual chlorine measuring unit 3 through the second injection valve 2, and the other is connected to the inlet of the fourth injection valve 8, the inlet of the fifth injection valve 10, the inlet of the sixth injection valve 12, the inlet of the seventh injection valve 14, the inlet of the eighth injection valve 16 and the inlet of the drain valve 18 through the third injection valve 5, the deep pretreatment module 6 and the sterilization module 7. The outlet of the fourth injection valve 8 is connected to the inlet of the conductivity measuring unit 9, the outlet of the fifth injection valve 10 is connected to the inlet of the pH measuring unit 11, the outlet of the sixth injection valve 12 is connected to the inlet of the hardness measuring unit 13, the outlet of the seventh injection valve 14 is connected to the inlet of the alkalinity measuring unit 15, and the outlet of the eighth injection valve 16 is connected to the inlet of the chloride ion measuring unit 17.

[0034] As an embodiment of the present invention, a photoelectric detection module 4 is provided on the outlet pipe of the residual chlorine measuring unit 3, the outlet pipe of the conductivity measuring unit 9, the outlet pipe of the pH measuring unit 11, the outlet pipe of the hardness measuring unit 13, the outlet pipe of the alkalinity measuring unit 15 and the outlet pipe of the chloride ion measuring unit 17.

[0035] As an embodiment of the present invention, the data processing system 19 is connected to the output end of the residual chlorine measuring unit 3, the output end of the conductivity measuring unit 9, the output end of the pH measuring unit 11, the output end of the hardness measuring unit 13, the output end of the alkalinity measuring unit 15 and the output end of the chloride ion measuring unit 17, and the data processing system 19 is connected to the centralized display unit 20.

[0036] As an embodiment of the present invention, the controller is connected to the first injection valve 1, the second injection valve 2, the third injection valve 5, the fourth injection valve 8, the fifth injection valve 10, the sixth injection valve 12, the seventh injection valve 14, the eighth injection valve 16 and the drain valve 18.

[0037] As an embodiment of the present invention, a photoelectric detection module 4 is installed on the water outlet pipe of the residual chlorine measuring unit 3, the conductivity measuring unit 9, the pH measuring unit 11, the hardness measuring unit 13, the alkalinity measuring unit 15 and the chloride ion measuring unit 17, and optical principles are used to determine whether there is water sample flowing. When there is no water sample in a certain measuring water channel, an alarm signal is transmitted to the data processing system 19, and an alarm prompt is displayed on the centralized display unit 20.

[0038] As an embodiment of the present invention, the deep pretreatment module 6 comprises activated carbon filter material for deep filtering the chromaticity and suspended impurities in the circulating water.

[0039] As an embodiment of the present invention, the sterilization module 7 adopts the sterilization principle of ultraviolet lamp, and can adopt low-pressure ultraviolet sterilization (wavelength 253.7nm or 185nm), and medium-pressure ultraviolet sterilization (wavelength 200nm~400nm) is more effective. The water sample is directly sterilized without adding chemical agents, and the sterilization is efficient and thorough, thereby preventing microorganisms from multiplying and attaching to subsequent measuring pipelines, circulation pools and electrode surfaces, thereby affecting the measurement accuracy.

[0040] It should be noted that the residual chlorine measuring unit 3 is arranged in a separate water channel because the activated carbon filter material in the deep pretreatment module 6 will adsorb and remove the residual chlorine, thus affecting its measurement result.

[0041] It should be noted that the sterilization module 7 is arranged after the deep pretreatment module 6. Since the ultraviolet lamp in the sterilization module 7 will decompose the residual chlorine into chloride ions, the residual chlorine in the water sample is first removed by the deep pretreatment module 6, which can ensure the accurate measurement of indicators such as conductivity and chloride ions in the water sample.

[0042] Embodiment 2

[0043] The multi-parameter online monitoring method for industrial circulating water of the present invention comprises:

[0044] Control the switches of the first injection valve 1, the second injection valve 2, the third injection valve 5, the fourth injection valve 8, the fifth injection valve 10, the sixth injection valve 12, the seventh injection valve 14 and the eighth injection valve 16, so that the water sample enters the residual chlorine measurement unit 3, the conductivity measurement unit 9, the pH measurement unit 11, the hardness measurement unit 13, the alkalinity measurement unit 15 and the chloride ion measurement unit 17 respectively;

[0045] The residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample are detected respectively by the residual chlorine measuring unit 3, the conductivity measuring unit 9, the pH measuring unit 11, the hardness measuring unit 13, the alkalinity measuring unit 15 and the chloride ion measuring unit 17.

[0046] As an embodiment of the present invention, the data processing system 19 is connected to the output end of the residual chlorine measuring unit 3, the output end of the conductivity measuring unit 9, the output end of the pH measuring unit 11, the output end of the hardness measuring unit 13, the output end of the alkalinity measuring unit 15 and the output end of the chloride ion measuring unit 17.

[0047] As an embodiment of the present invention, the data processing system 19 is connected to a centralized display unit 20 .

[0048] As an embodiment of the present invention, a photoelectric detection module 4 is provided on the outlet pipe of the residual chlorine measuring unit 3, the outlet pipe of the conductivity measuring unit 9, the outlet pipe of the pH measuring unit 11, the outlet pipe of the hardness measuring unit 13, the outlet pipe of the alkalinity measuring unit 15 and the outlet pipe of the chloride ion measuring unit 17.

[0049] Embodiment 3

[0050] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for online monitoring of multiple parameters of industrial circulating water are implemented, for example, the steps include: controlling the switches of a first injection valve 1, a second injection valve 2, a third injection valve 5, a fourth injection valve 8, a fifth injection valve 10, a sixth injection valve 12, a seventh injection valve 14 and an eighth injection valve 16, so that a water sample enters a residual chlorine measurement unit 3, a conductivity measurement unit 9, a pH measurement unit 11, a hardness measurement unit 13, an alkalinity measurement unit 15 and a chloride ion measurement unit 17 respectively; and detecting residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample by the residual chlorine measurement unit 3, the conductivity measurement unit 9, the pH measurement unit 11, the hardness measurement unit 13, the alkalinity measurement unit 15 and the chloride ion measurement unit 17 respectively. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, network interface, and memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0051] Embodiment 4

[0052] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the industrial circulating water multi-parameter online monitoring method are implemented, for example, including: controlling the switches of the first injection valve 1, the second injection valve 2, the third injection valve 5, the fourth injection valve 8, the fifth injection valve 10, the sixth injection valve 12, the seventh injection valve 14 and the eighth injection valve 16, so that the water sample enters the residual chlorine measurement unit 3, the conductivity measurement unit 9, the pH measurement unit 11, the hardness measurement unit 13, the alkalinity measurement unit 15 and the chloride ion measurement unit 17 respectively; and detecting the residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample by the residual chlorine measurement unit 3, the conductivity measurement unit 9, the pH measurement unit 11, the hardness measurement unit 13, the alkalinity measurement unit 15 and the chloride ion measurement unit 17 respectively. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0053] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0054] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0058] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An industrial circulating water multi-parameter online monitoring system, characterized in that: It comprises a circulating water sample input pipeline, a first injection valve (1), a second injection valve (2), a residual chlorine measuring unit (3), a photoelectric detection module (4), a third injection valve (5), a deep pretreatment module (6), a sterilization module (7), a fourth injection valve (8), a conductivity measuring unit (9), a fifth injection valve (10), a pH measuring unit (11), a sixth injection valve (12), a hardness measuring unit (13), a seventh injection valve (14), an alkalinity measuring unit (15), an eighth injection valve (16), a chloride ion measuring unit (17) and a drain valve (18); The outlet of the circulating water sample input pipeline is divided into two routes, one of which is connected to the inlet of the residual chlorine measuring unit (3) through the second injection valve (2), and the other is connected to the inlet of the fourth injection valve (8), the inlet of the fifth injection valve (10), the inlet of the sixth injection valve (12), the inlet of the seventh injection valve (14), the inlet of the eighth injection valve (16) and the inlet of the sewage valve (18) through the third injection valve (5), the deep pretreatment module (6) and the sterilization module (7). The outlet of the fourth injection valve (8) is connected to the inlet of the conductivity measuring unit (9), the outlet of the fifth injection valve (10) is connected to the inlet of the pH measuring unit (11), the outlet of the sixth injection valve (12) is connected to the inlet of the hardness measuring unit (13), the outlet of the seventh injection valve (14) is connected to the inlet of the alkalinity measuring unit (15), and the outlet of the eighth injection valve (16) is connected to the inlet of the chloride ion measuring unit (17).

2. The industrial circulating water multi-parameter online monitoring system according to claim 1 is characterized in that: Photoelectric detection modules (4) are arranged on the outlet pipe of the residual chlorine measurement unit (3), the outlet pipe of the conductivity measurement unit (9), the outlet pipe of the pH measurement unit (11), the outlet pipe of the hardness measurement unit (13), the outlet pipe of the alkalinity measurement unit (15) and the outlet pipe of the chloride ion measurement unit (17).

3. The industrial circulating water multi-parameter online monitoring system according to claim 1 is characterized in that: The data processing system (19) is connected to the output end of the residual chlorine measuring unit (3), the output end of the conductivity measuring unit (9), the output end of the pH measuring unit (11), the output end of the hardness measuring unit (13), the output end of the alkalinity measuring unit (15), and the output end of the chloride ion measuring unit (17).

4. The industrial circulating water multi-parameter online monitoring system according to claim 1 is characterized in that: The data processing system (19) is connected to a centralized display unit (20).

5. The industrial circulating water multi-parameter online monitoring system according to claim 1 is characterized in that: The controller is connected to the first injection valve (1), the second injection valve (2), the third injection valve (5), the fourth injection valve (8), the fifth injection valve (10), the sixth injection valve (12), the seventh injection valve (14), the eighth injection valve (16) and the drain valve (18).

6. The industrial circulating water multi-parameter online monitoring system according to claim 1 is characterized in that: The deep pretreatment module (6) contains activated carbon filter material.

7. A method for online monitoring of multiple parameters of industrial circulating water, characterized in that: The industrial circulating water multi-parameter online monitoring system according to claim 1 comprises: Controlling the opening and closing of the first injection valve (1), the second injection valve (2), the third injection valve (5), the fourth injection valve (8), the fifth injection valve (10), the sixth injection valve (12), the seventh injection valve (14) and the eighth injection valve (16), so that the water sample respectively enters the residual chlorine measurement unit (3), the conductivity measurement unit (9), the pH measurement unit (11), the hardness measurement unit (13), the alkalinity measurement unit (15) and the chloride ion measurement unit (17); The residual chlorine information, conductivity information, pH value, hardness, alkalinity and chloride ion concentration information of the water sample are respectively detected by the residual chlorine measuring unit (3), the conductivity measuring unit (9), the pH measuring unit (11), the hardness measuring unit (13), the alkalinity measuring unit (15) and the chloride ion measuring unit (17).

8. The industrial circulating water multi-parameter online monitoring system according to claim 7 is characterized in that: The data processing system (19) is connected to the output end of the residual chlorine measuring unit (3), the output end of the conductivity measuring unit (9), the output end of the pH measuring unit (11), the output end of the hardness measuring unit (13), the output end of the alkalinity measuring unit (15), and the output end of the chloride ion measuring unit (17).

9. The industrial circulating water multi-parameter online monitoring system according to claim 7 is characterized in that: The data processing system (19) is connected to a centralized display unit (20).

10. The industrial circulating water multi-parameter online monitoring system according to claim 7, characterized in that: Photoelectric detection modules (4) are arranged on the outlet pipe of the residual chlorine measurement unit (3), the outlet pipe of the conductivity measurement unit (9), the outlet pipe of the pH measurement unit (11), the outlet pipe of the hardness measurement unit (13), the outlet pipe of the alkalinity measurement unit (15) and the outlet pipe of the chloride ion measurement unit (17).

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