A monitoring method of an industrial circulating water online monitoring device

Abstract

The application discloses an industrial circulating water online monitoring device and a monitoring method, and relates to the technical field of water quality monitoring devices. The device comprises a sampling pipeline unit, a sampling instrument unit and a control unit. The sampling instrument unit comprises a pH online measuring instrument, a conductivity online measuring instrument, a residual chlorine online measuring instrument, an alkalinity online measuring instrument, a hardness online measuring instrument, a corrosion online measuring instrument, a fouling resistance online measuring instrument and a sewage ditch. The control unit comprises a touch screen and a PLC controller. The touch screen is in communication connection with the PLC controller. The PLC controller is electrically connected with the pH online measuring instrument, the conductivity online measuring instrument, the residual chlorine online measuring instrument, the alkalinity online measuring instrument, the hardness online measuring instrument, the corrosion online measuring instrument, the fouling resistance online measuring instrument, a circulating water sampling electric valve and a supplementary water sampling electric valve. The method can conveniently realize the control of industrial circulating water online monitoring without manual intervention.

Description

Technical Field

[0001] This invention relates to the field of online monitoring technology for industrial circulating water quality, and in particular to an online monitoring device and method for industrial circulating water. Background Technology

[0002] Currently, the operation and management of most industrial circulating water systems are very rudimentary. The circulating water quality data is basically measured manually 2-3 times a day. Due to the long interval between manual sampling and the ease with which measurement errors are introduced, the monitoring of the circulating water system relies entirely on the manual measurement status of the operators. Real-time industrial circulating water quality parameters cannot be obtained, which increases the risk of scaling and corrosion in the industrial circulating water system and causes economic losses.

[0003] Changes in unit load, ambient temperature, and atmospheric humidity can affect the quality of industrial circulating water. Furthermore, timely data feedback on circulating water quality is crucial for guiding operations. However, manual offline sampling suffers from limitations in both timeliness and real-time performance, making it impossible for operators to accurately assess the real-time water quality and creating safety hazards. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides an online monitoring device and method for industrial circulating water. Under normal operating conditions, the device automatically monitors the water quality indicators of both circulating water and makeup water, including pH, conductivity, residual chlorine, alkalinity, hardness, corrosion rate, and adhesion rate, without manual intervention. After data collection, it automatically updates the circulating water quality indicators, accurately displaying the operating status of the circulating water system, which is beneficial for its normal operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An online monitoring device for industrial circulating water includes a sampling pipeline unit, a sampling instrument unit, and a control unit; The sampling pipeline unit includes an industrial circulating water tower and a circulating water pump. The inlet of the circulating water pump is connected to the return water pool of the industrial circulating water tower. The outlet of the circulating water pump is divided into two paths: one is a water supply pipeline connected to the water inlet of the industrial circulating water tower, and the other is a pipeline connected to the circulating water makeup water pipeline and flows into the return water pool. The sampling instrument unit includes five parallel sampling pipelines connected by pipes. The first pipeline is equipped with an online pH measuring instrument, an online conductivity measuring instrument, and an online residual chlorine measuring instrument. The second pipeline is equipped with an online alkalinity measuring instrument. The third pipeline is equipped with an online hardness measuring instrument. The fourth pipeline is equipped with an online corrosion measuring instrument. The fifth pipeline is equipped with an online fouling thermal resistance measuring instrument. The control unit is electrically connected to the sampling instrument unit.

[0006] As a further improvement of the present invention, the control unit includes a touch screen and a PLC controller. The PLC controller is electrically connected to the online pH measuring instrument, the online conductivity measuring instrument, the online residual chlorine measuring instrument, the online alkalinity measuring instrument, the online hardness measuring instrument, the online corrosion measuring instrument, the online fouling thermal resistance measuring instrument, the circulating water sampling electric valve, and the makeup water sampling electric valve.

[0007] As a further improvement of the present invention, the pipeline is provided with a manual circulating water sampling valve and a power circulating water sampling valve in sequence; the circulating water replenishment pipeline is provided with a manual replenishment water sampling valve and a power replenishment water sampling valve in sequence. The control unit is electrically connected to both the supplemental water sampling electric valve and the circulating water sampling electric valve.

[0008] As a further improvement of the present invention, the five pipeline outlets are converged into the sewage ditch.

[0009] A monitoring method for an online monitoring device for industrial circulating water includes the following steps: By using circulating water sampling electric valves and makeup water sampling electric valves, the PLC controller periodically samples the circulating water and makeup water according to the preset sampling interval and water flow time.

[0010] As a further improvement of the present invention, when the internal timer t1 of the PLC controller is equal to the set circulating water sampling interval time T1, the PLC controller will open the circulating water sampling electric valve; at the same time, the internal timer t3 will be started, and when the timer t3 is equal to the set instrument water flow time T3, the circulating water sampling electric valve will be closed and the circulating water sampling data will be updated. When the internal timer t2 of the PLC controller is equal to the set circulating water sampling interval T2, the PLC controller will open the replenishing water sampling electric valve; at the same time, the internal timer t3 will be started. When the timer t3 is equal to the set instrument water flow time T3, the replenishing water sampling electric valve will be closed and the replenishing water sampling data will be updated.

[0011] Compared with the prior art, the present invention has the following advantages: This invention's device installs sampling tubes at the outlet of the circulating water pump and the outlet of the makeup water pump. Five sampling channels are arranged in parallel on each sampling tube. The first channel is equipped with online measuring instruments for pH, conductivity, and residual chlorine; the second channel is equipped with an online measuring instrument for alkalinity; the third channel is equipped with an online measuring instrument for hardness; the fourth channel is equipped with an online measuring instrument for corrosion; and the fifth channel is equipped with an online measuring instrument for fouling thermal resistance. Sampling pipes are installed on the circulating water sampling valve and the makeup water sampling valve, respectively. A timer function controlled by a PLC controls the opening and closing of the circulating water sampling valve and the makeup water sampling valve, updating the monitoring data of the circulating water system and thus intuitively displaying the operating status of the circulating water system.

[0012] This invention utilizes a control method that segments the highly lag-prone circulating water system into timed sampling systems for each sampling cycle. This ensures continuous monitoring of circulating water quality indicators and extends the lifespan of the instruments. Without manual intervention, the circulating water system's water quality data is continuously and automatically updated, improving the safety and economy of industrial circulating water operation. Attached Figure Description

[0013] Figure 1 Industrial circulating water online monitoring device; Figure 2 Flowchart of online monitoring method for industrial circulating water.

[0014] The components include: 1. Industrial circulating water tower; 2. Circulating water pump; 3. Manual valve for circulating water sampling; 4. Manual valve for makeup water sampling; 5. Electric valve for makeup water sampling; 6. Electric valve for circulating water sampling; 7. Touch screen; 8. PLC controller; 9. Online residual chlorine measuring instrument; 10. Online conductivity measuring instrument; 11. Online pH measuring instrument; 12. Online alkalinity measuring instrument; 13. Online hardness measuring instrument; 14. Online corrosion rate measuring instrument; 15. Online fouling thermal resistance measuring instrument; and 16. Drainage ditch. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0016] like Figure 1 As shown, an online monitoring device for industrial circulating water according to the present invention includes a sampling pipeline unit, a sampling instrument unit, and a control unit.

[0017] The sampling pipeline unit includes a circulating water pump 2 outlet and an industrial circulating water tower 1 connected by a pipeline. The connecting pipeline has a circulating water sampling manual valve 3 and a circulating water sampling electric valve 6 in sequence. The circulating water replenishment pipeline has a replenishment water sampling manual valve 4 and a replenishment water sampling electric valve 5 in sequence.

[0018] The sampling instrument unit includes five parallel sampling pipelines connected by pipes. The first pipeline is equipped with an online pH measuring instrument 11, an online conductivity measuring instrument 10, and an online residual chlorine measuring instrument 9. The second pipeline is equipped with an online alkalinity measuring instrument 12. The third pipeline is equipped with an online hardness measuring instrument 13. The fourth pipeline is equipped with an online corrosion measuring instrument 14. The fifth pipeline is equipped with an online fouling thermal resistance measuring instrument 15. The outlets of these five pipelines are connected to a sewage ditch 16 for sewage discharge.

[0019] The control unit includes a touch screen 7 and a PLC controller 8. The PLC controller 8 is electrically connected to the online pH measuring instrument 11, the online conductivity measuring instrument 10, the online residual chlorine measuring instrument 9, the online alkalinity measuring instrument 12, the online hardness measuring instrument 13, the online corrosion measuring instrument 14, the online fouling thermal resistance measuring instrument 15, the circulating water sampling electric valve 6, and the makeup water sampling electric valve 5.

[0020] The monitoring method based on the above-mentioned industrial circulating water online monitoring device includes the following steps: This device features online pH, conductivity, residual chlorine, alkalinity, hardness, corrosion, and fouling thermal resistance measuring instruments. Using electric sampling valves for circulating water and makeup water, and based on pre-set sampling intervals T1 and T2 and a water flow time T3, the PLC controller, through a timer function, periodically samples the circulating water and makeup water at set time intervals, updating the water quality information of the circulating water system. Utilizing the lag inherent in the large circulating water system, segmented circulating water sampling is achieved. This invention allows for convenient control of industrial circulating water quality data sampling without manual intervention, while also extending the service life of each instrument.

[0021] The following is in conjunction with the appendix Figure 1 and attached Figure 2 The specific embodiments of the present invention will be further described below.

[0022] Example As attached Figure 1 As shown, when putting the industrial circulating water online monitoring device into operation, open the circulating water sampling manual valve 3 and the makeup water sampling manual valve 4, confirm the circulating water sampling interval time T1 and T2 and the instrument water flow time T3 on the touch screen 7, and click the automatic sampling button to put the industrial circulating water automatic control device into automatic operation.

[0023] As attached Figure 2 As shown, every sampling period T1, the PLC controller opens the circulating water sampling electric valve, and after the valve has been open for time T3, it closes the circulating water sampling electric valve and updates the circulating water data information. Every sampling period T2, the PLC controller opens the makeup water sampling electric valve, and after the valve has been open for time T3, it closes the makeup water sampling electric valve and updates the makeup water data information. This ensures the real-time water quality information of the circulating water system, thus meeting the water quality data monitoring requirements of the industrial circulating water system.

[0024] The specific steps are as follows: Set the circulating water sampling intervals T1 and T2, and the instrument water flow time T3 on the touchscreen 7. Click the automatic sampling button to start the automatic sampling function of industrial circulating water. The internal timers t1 and t2 of the PLC controller 8 will start timing respectively.

[0025] When the internal timer t1 of the PLC controller 8 is equal to the circulating water sampling interval T1 set on the touch screen 7, the PLC controller 8 will open the circulating water sampling electric valve 6; at the same time, the internal timer t3 will be started. When the timer t3 is equal to the instrument water flow time T3 set on the touch screen 7, the circulating water sampling electric valve 6 will be closed and the circulating water sampling data will be updated.

[0026] When the internal timer t2 of the PLC controller 8 is equal to the circulating water sampling interval T2 set on the touch screen 7, the PLC controller 8 will open the supplementary water sampling electric valve 5; at the same time, the internal timer t3 will be started. When the timer t3 is equal to the instrument water flow time T3 set on the touch screen 7, the supplementary water sampling electric valve 6 will be closed to update the supplementary water sampling data.

[0027] The above data update method enables online monitoring of industrial circulating water.

[0028] In summary, the device of the present invention includes: a sampling pipeline unit, a sampling instrument unit, and a control unit; wherein, the sampling pipeline unit includes a circulating water pump 2, a circulating water sampling manual valve 3, a circulating water sampling electric valve 6, a makeup water sampling manual valve 4, and a makeup water sampling electric valve 5. The inlet and outlet of the circulating water pump 2 are both connected to the industrial circulating water tower 1 via pipelines; the circulating water sampling manual valve 3 and the circulating water sampling electric valve 6 are arranged sequentially on the outlet pipeline of the circulating water pump 2; the makeup water sampling manual valve 4 and the makeup water sampling electric valve 5 are arranged sequentially on the makeup water outlet pipeline. The sampling instrument unit includes an online pH measuring instrument 11, an online conductivity measuring instrument 10, an online residual chlorine measuring instrument 9, an online alkalinity measuring instrument 12, an online hardness measuring instrument 13, an online corrosion measuring instrument 14, an online fouling thermal resistance measuring instrument 15, and is connected to a sewage ditch 16. The control unit includes a touch screen and a PLC controller. The touch screen is communicatively connected to the PLC controller, and the PLC controller is electrically connected to online pH, conductivity, residual chlorine, alkalinity, hardness, corrosion, and fouling thermal resistance meters, as well as circulating water sampling electric valves and makeup water sampling electric valves. This invention allows for convenient online monitoring and control of industrial circulating water without manual intervention.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A monitoring method for an online monitoring device for industrial circulating water, characterized in that, The monitoring device includes a sampling pipeline unit, a sampling instrument unit, and a control unit; The sampling pipeline unit includes an industrial circulating water tower (1) and a circulating water pump (2). The inlet of the circulating water pump (2) is connected to the return water pool of the industrial circulating water tower (1). The outlet of the circulating water pump (2) is divided into two paths. One path is a water supply pipeline connected to the inlet of the industrial circulating water tower (1), and the other path is connected to the circulating water replenishment pipeline and flows into the return water pool. The sampling instrument unit includes five parallel sampling pipelines connected by pipes. The first pipeline is equipped with an online pH measuring instrument (11), an online conductivity measuring instrument (10), and an online residual chlorine measuring instrument (9). The second pipeline is equipped with an online alkalinity measuring instrument (12). The third pipeline is equipped with an online hardness measuring instrument (13). The fourth pipeline is equipped with an online corrosion measuring instrument (14). The fifth pipeline is equipped with an online fouling thermal resistance measuring instrument (15). The control unit is electrically connected to the sampling instrument unit; The monitoring method includes the following steps: By using the circulating water sampling electric valve (6) and the replenishment water sampling electric valve (5), according to the preset sampling interval time and instrument water flow time, the PLC controller (8) periodically samples the circulating water and replenishment water according to the set time interval.

2. The monitoring method of the industrial circulating water online monitoring device according to claim 1, characterized in that, The control unit includes a touch screen (7) and a PLC controller (8). The PLC controller (8) is electrically connected to the pH online measuring instrument (11), the conductivity online measuring instrument (10), the residual chlorine online measuring instrument (9), the alkalinity online measuring instrument (12), the hardness online measuring instrument (13), the corrosion online measuring instrument (14), the fouling thermal resistance online measuring instrument (15), the circulating water sampling electric valve (6), and the makeup water sampling electric valve (5).

3. The monitoring method of the industrial circulating water online monitoring device according to claim 2, characterized in that, The sampling pipeline is provided with a circulating water sampling manual valve (3) and a circulating water sampling electric valve (6) in sequence; the circulating water replenishment pipeline is provided with a replenishment water sampling manual valve (4) and a replenishment water sampling electric valve (5) in sequence.

4. The monitoring method of the industrial circulating water online monitoring device according to claim 1, characterized in that, The outlets of the five pipelines converge into the sewage ditch (16).

5. The monitoring method of the industrial circulating water online monitoring device according to claim 1, specifically includes: When the internal timer t1 of the PLC controller (8) is equal to the set circulating water sampling interval time T1, the PLC controller (8) will open the circulating water sampling electric valve (6); at the same time, the internal timer t3 will be started. When the timer t3 is equal to the set instrument water flow time T3, the circulating water sampling electric valve (6) will be closed and the circulating water sampling data will be updated. When the internal timer t2 of the PLC controller (8) is equal to the set circulating water sampling interval time T2, the PLC controller (8) will open the supplementary water sampling electric valve (5); at the same time, the internal timer t3 will be started. When the timer t3 is equal to the set instrument water flow time T3, the supplementary water sampling electric valve (5) will be closed and the supplementary water sampling data will be updated.

Images