Scale inhibition device for online monitoring equipment

Abstract

The utility model discloses a scale inhibition device of on-line monitoring equipment. A scale inhibition tank and a scale inhibitor adding device are arranged between a water sample preparation device and the on-line monitoring equipment; the output end of the water sample preparation device is connected with a water / air inlet hole in the bottom of the scale inhibition tank through a water / air supply pipe; the scale inhibitor adding device comprises a scale inhibitor storage bottle, a scale inhibitor dosing pipe and a dosing pump, the output end of the scale inhibitor storage bottle is connected with a scale inhibitor dosing hole of the scale inhibition pool through the scale inhibitor dosing pipe, and the dosing pump is installed on the scale inhibitor dosing pipe; and the monitoring sampling hole of the scale inhibition tank is connected with the sampling end of the online monitoring equipment through a sampling pipe. Through the mode, scale inhibition and scale dissolution of an on-line monitoring equipment system can be effectively realized, so that the stability and the reliability of operation of the on-line monitoring equipment are guaranteed, and the operation cost of the on-line monitoring equipment is reduced at the same time.

Description

Technical Field

[0001] This utility model relates to the field of online detection and analysis, and in particular to a scale inhibition device for online monitoring equipment. Background Technology

[0002] With the automation and intelligent development of the wastewater treatment industry, online monitoring instruments have been widely used to monitor the influent / effluent and process water quality of wastewater treatment plants, providing on-site sensing data for intelligent control systems, thereby adjusting the operating parameters of wastewater treatment facilities and instruments in a timely manner to ensure compliance with discharge standards.

[0003] In online monitoring of industrial wastewater, the scaling effect of high-hardness wastewater, exemplified by the paper industry, severely affects the stable and accurate operation of sampling and testing instruments, leading to high maintenance costs and rapid wear and tear of equipment components (due to corrosion and scaling). This poses a significant challenge to the stability and reliability of online monitoring data, impacting the control and diagnostic analysis of intelligent water systems, and consequently affecting the effective operation of these systems.

[0004] As companies in industries such as papermaking advance the refined and intelligent operation and management of wastewater treatment plants, the scaling problem of online monitoring equipment urgently needs to be solved to ensure the realization of refined and intelligent operation of wastewater treatment plants. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a scale inhibition device for online monitoring equipment, which can effectively inhibit and dissolve scale in the online monitoring equipment system, so as to ensure the stability and reliability of the online monitoring equipment operation and reduce its operating costs.

[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: providing an online monitoring equipment scale inhibition device, wherein a scale inhibition tank and a scale inhibitor dosing device are installed between the water sample preparation device and the online monitoring equipment;

[0007] The output end of the water sample preparation device is connected to the water inlet / air hole at the bottom of the scale inhibition tank via a water / air supply pipe.

[0008] The scale inhibitor dosing device includes a scale inhibitor storage bottle, a scale inhibitor dosing pipe, and a dosing pump. The output end of the scale inhibitor storage bottle is connected to the scale inhibitor dosing hole of the scale inhibition tank through the scale inhibitor dosing pipe, and the dosing pump is installed on the scale inhibitor dosing pipe.

[0009] The monitoring sampling port of the scale inhibition tank is connected to the sampling end of the online monitoring equipment through a sampling tube.

[0010] In a preferred embodiment of this utility model, a water sample delivery pump capable of reversible operation is installed on the water / air delivery pipe for extracting water samples from the water sample preparation device or the scale inhibition tank, or for extracting air.

[0011] Furthermore, the water sample transfer pump is a peristaltic pump, with a preferred flow rate of 10-30 mL / min.

[0012] In a preferred embodiment of this utility model, the scale inhibitor storage bottle is a relatively sealed plastic bottle with a vent, and has an effective volume of 500-5000mL.

[0013] In a preferred embodiment of this utility model, the dosing pump is a peristaltic pump, which can achieve precise dosing with a dosing flow rate accuracy of 0.6-6.0 mL / min.

[0014] In a preferred embodiment of this invention, the top of the scale inhibition tank is sealed by a stopcock.

[0015] In a preferred embodiment of this utility model, a water sample overflow hole is provided between the scale inhibitor dosing hole and the monitoring sampling hole on the scale inhibition tank. The vertical distance between the scale inhibitor dosing hole, the water sample overflow hole, and the monitoring sampling hole is preferably 1.5-3 cm.

[0016] Furthermore, the monitoring sampling hole is preferably located at 50-80% of the liquid level in the scale inhibition tank.

[0017] Furthermore, an overflow pipe is provided at the water sample overflow hole.

[0018] In a preferred embodiment of this utility model, a sampling pump is provided on the sampling tube, and the sampling pump is a component integrated into the online monitoring device.

[0019] The beneficial effects of this utility model are:

[0020] (1) This utility model can achieve scale inhibition and scale dissolution effects on both the water sample preparation device and the online monitoring device by installing a scale inhibition tank and a scale inhibitor dosing device between the water sample preparation device and the online monitoring device, and the scale inhibition effect has a wide range.

[0021] (2) The structure of this utility model is relatively simple, making maximum use of the original device of the online monitoring system, with low cost and convenient operation and maintenance;

[0022] (3) The operation mode of this utility model is flexible. It can operate continuously or intermittently, and can inhibit scale during detection or inhibit scale after detection (to avoid interference with water quality detection). Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a preferred embodiment of the scale inhibition device for online monitoring equipment of this utility model.

[0024] The components in the attached diagram are labeled as follows: 1. Water sample preparation device; 11. Water / air supply pipe; 12. Water sample delivery pump; 2. Scale inhibitor tank; 21. Water / air inlet; 22. Scale inhibitor dosing port; 23. Monitoring and sampling port; 24. Stopcock; 25. Water sample overflow port; 31. Scale inhibitor storage bottle; 32. Scale inhibitor dosing pipe; 33. Dosing pump; 4. Online monitoring equipment; 41. Sampling pipe; 42. Sampling pump; 5. Overflow pipe. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0026] Please see Figure 1 The embodiments of this utility model include:

[0027] An online monitoring device for scale inhibition comprises a water sample preparation device 1, a scale inhibition tank 2, a scale inhibitor dosing device, and an online monitoring device 4. The scale inhibition tank 2 and the scale inhibitor dosing device are installed between the water sample preparation device 1 and the online monitoring device 4. The output end of the water sample preparation device 1 is connected to the water / air inlet 21 at the bottom of the scale inhibition tank 2 via a water / air supply pipe 11. The scale inhibitor dosing device includes a scale inhibitor storage bottle 31, a scale inhibitor dosing pipe 32, and a dosing pump 33. The output end of the scale inhibitor storage bottle 31 is connected to the scale inhibitor dosing port 22 of the scale inhibition tank 2 via the scale inhibitor dosing pipe 32, and the dosing pump 33 is installed on the scale inhibitor dosing pipe 32. The monitoring sampling port 23 of the scale inhibition tank 2 is connected to the sampling end of the online monitoring device 4 via a sampling pipe 41.

[0028] The water sample preparation device 1 extracts water samples from the wastewater treatment plant's process unit and performs solid-liquid separation, wherein the solid-liquid separation can be filtration separation, sedimentation separation, or a combination of both. The clarified water sample obtained from the solid-liquid separation by the water sample preparation device 1 is sent into the scale inhibition tank 2 through the water sample delivery pump 12 and the water / air delivery pipe 11.

[0029] Preferably, the water sample transfer pump 12 is a peristaltic pump, which can achieve a flow rate of 10-30 mL / min.

[0030] In this example, the scale inhibition tank 2 is a cylindrical plastic tube with a volume of 50-150mL, preferably 5-6cm in diameter, sealed at the bottom and sealed at the top by a stopcock 24.

[0031] Furthermore, the scale inhibition tank 2 is provided with a water / air inlet 21 at the bottom center, which is connected to the rear end of the water / air delivery pipe 21 to receive the water sample prepared by the water sample preparation device 1 or the air drawn by the water sample delivery pump 12.

[0032] A water sample overflow hole 25 is provided between the scale inhibitor dosing hole 22 and the monitoring sampling hole 23 on the scale inhibition tank 2. The vertical distance between the scale inhibitor dosing hole 22, the water sample overflow hole 25, and the monitoring sampling hole 33 is preferably 1.5-3 cm. The highest liquid level of the scale inhibition tank 2 is determined by the water sample overflow hole 25. The monitoring sampling hole 33 is preferably located at 50-80% of the liquid level.

[0033] Furthermore, the scale inhibitor dosing hole 22 is connected to the end of the scale inhibitor dosing pipe 32 to deliver the scale inhibitor to the scale inhibition tank 2; the water sample overflow hole 25 is connected to the overflow pipe 5 to overflow excess water sample, thereby achieving water sample renewal and liquid level control in the scale inhibition tank 2; the monitoring sampling hole 23 is connected to the sampling pipe 41 of the online monitoring device 4 to deliver the scale-inhibited water sample to the online monitoring device 4 for detection and analysis.

[0034] In this example, the scale inhibitor storage bottle 31 is a relatively sealed plastic bottle with a vent, with an effective volume of 500-5000mL, and can be used for more than one month after being filled with the drug once.

[0035] Preferably, the dosing pump 33 is a peristaltic pump, which can achieve precise dosing with a dosing flow rate accuracy of 0.6-6.0 mL / min.

[0036] Furthermore, the online monitoring device 4 is equipped with a sampling pump 42 and a sampling tube 41. The sampling tube 41 is connected to the monitoring sampling hole 23 of the scale inhibition tank 2, and the water sample required for testing is extracted by the sampling pump 42.

[0037] The online monitoring device 4 can detect indicators such as COD, TP, TN, ammonia nitrogen, phosphate, nitrate, and heavy metals, and the detection methods can be chemical methods, electrode methods, or spectroscopic methods.

[0038] The scale inhibition device of the online monitoring equipment can add scale inhibitor before water sample testing. The method and steps are as follows:

[0039] S11. Water sample preparation: Obtain a clear water sample using water sample preparation device 1;

[0040] S12. Intermediate sampling: The clarified water sample obtained from the water sample preparation device 1 is transported to the scale inhibition tank 2 through the water sample delivery pump 12 and the water / air delivery pipe 11. The volume of the transported water sample needs to reach 2-3 times the effective volume of the scale inhibition tank 2. Excess water sample is discharged through the monitoring overflow hole 23.

[0041] S13. Drainage and air intake: After the scale inhibition tank 2 completes the sampling, the water sample preparation device 1 discharges the remaining water sample, so that one end of the water supply / air pipe 11 connected to the water sample preparation device 1 is exposed to the air, creating conditions for subsequent air intake.

[0042] S14. Bubble agitation: The water sample delivery pump 12 runs again. At this time, since the front end of the water / air pipe 11 is exposed to the air, the water sample delivery pump 12 plays the role of air delivery. The air delivery continues for 30-60 seconds after the scale inhibitor is added. Through bubble agitation, the mixing and reaction of the scale inhibitor and the water sample are promoted.

[0043] S15. Scale inhibition by chemical dosing: After the scale inhibition tank 2 is agitated by air intake, the dosing pump 33 is started. According to the test data, scale inhibitor is added to the scale inhibition tank 2. The scale inhibitor is added by drops, and the volume of each drop of scale inhibitor is 50 microliters. Under the agitation of the air bubbles, the scale inhibitor and the water sample are mixed and reacted.

[0044] S16. Static sedimentation: After the scale inhibitor reaction is completed for 30-60 seconds, stop the air supply and the water sample from scale inhibition tank 2 enters the static sedimentation tank. The sedimentation time is 1-10 minutes.

[0045] S17. Sampling and testing: After the scale inhibition tank 2 completes static sedimentation, the online monitoring device 4 extracts the water sample to be tested from the monitoring sampling hole 23 of the scale inhibition tank 2 for testing and analysis.

[0046] S18. Scale Cleaning: After sampling, the water sample transfer pump 12 reverses its operation, transporting the water sample from the scale inhibition tank 2 to the water sample preparation device 1. During the transport process, the flow rate is controlled to ensure that the water sample containing the scale inhibitor contacts the device, components, and pipelines for 30-60 minutes, thoroughly washing away the scale on the equipment and pipelines.

[0047] In addition, this device can also add scale inhibitors after detection, and the method and steps are as follows:

[0048] S21. Water sample preparation: Obtain a clear water sample using the water sample preparation device 1;

[0049] S22. Intermediate sampling: The clarified water sample obtained from the water sample preparation device 1 is transported to the scale inhibition tank 2 through the water sample delivery pump 12 and the water / air delivery pipe 11. The volume of the transported water sample needs to reach 2-3 times the effective volume of the scale inhibition tank 2. Excess water sample is discharged through the water sample overflow hole 25.

[0050] S23. Water sample sedimentation: After the sample is introduced into scale inhibition tank 2, it enters static sedimentation, and the sedimentation time is 1-10 minutes.

[0051] S24. Sampling and testing: After the scale inhibition tank 2 has completed static sedimentation, the online monitoring device 4 extracts the water sample to be tested from the monitoring sampling hole 23 of the scale inhibition tank 2 for testing and analysis.

[0052] S25. Drainage and Air Intake: After sampling and testing are completed, the water sample preparation device drains the remaining water sample, exposing one end of the water / air pipe 11 connected to the water sample preparation device 1 to the air, creating conditions for subsequent air intake.

[0053] S26. Bubble agitation: After the drainage and air intake are completed, the water sample delivery pump 12 runs again. At this time, since the front end of the water / air pipe 11 is exposed to the air, the water sample delivery pump 12 plays the role of air delivery. The air delivery continues for 30-60 seconds after the scale inhibitor is added. Through bubble agitation, the mixing and reaction of the scale inhibitor and the water sample are promoted.

[0054] S27. Scale inhibition by chemical dosing: After the scale inhibition tank 2 is agitated by air intake, the dosing pump 33 is started. According to the test data, scale inhibitor is added to the scale inhibition tank 2. The scale inhibitor is added by drops, and the volume of each drop of scale inhibitor is 50 microliters. Under the agitation of the air bubbles, the scale inhibitor and the water sample are mixed and reacted.

[0055] S28. Scale Cleaning: After the scale inhibition tank 2 completes the dosing and reaction, upstream, the water sample transfer pump 12 reverses its operation, transporting the water sample from the scale inhibition tank 2 to the water sample preparation device 1 and its intermediate pipeline. Downstream, the online monitoring device 4 extracts water samples containing the scale inhibitor into its pipelines and container components. During the transport process, the flow rate is controlled to ensure that the contact time between the water sample containing the scale inhibitor and the device, components, and pipelines reaches 30-60 minutes, thoroughly washing away the scale on the equipment and pipelines.

[0056] This device can be operated continuously according to steps S11-S18 and S21-S28 (i.e., it runs once for each detection and sampling), or it can be operated intermittently (once every 1-30 days). The appropriate operating frequency can be selected according to the calcium ion concentration and scaling level.

[0057] If the scale inhibitor used in this device interferes with the water quality test results (such as the interference of chloride ions in hydrochloric acid with COD detection, or the interference of phosphorus-containing scale inhibitors with TP detection), the scale inhibitor shall be added after water quality sampling and testing, that is, the process shall be operated according to steps S21-S28.

[0058] The advantages of this device will be illustrated below with a specific example:

[0059] A wastewater treatment plant of a paper mill uses a process that includes a coagulation tank, primary sedimentation tank, hydrolysis tank, IC anaerobic reactor, aeration tank, secondary sedimentation tank, and high-efficiency sedimentation tank. To achieve intelligent control of the surface aerators in the aeration tank, online COD and ammonia nitrogen analyzers are installed at the IC effluent outlet, the middle of the aeration tank, and the end of the aeration tank, respectively.

[0060] Due to its high calcium ion concentration (approximately 800-1000 mg / L), the water sample preparation device, online monitoring device, and their pipelines suffer from severe scaling problems, leading to rapid equipment wear and a high probability of abnormal test data. Therefore, the scale inhibition device of the online monitoring equipment of this utility model is adopted to solve the problem of calcium ion scaling.

[0061] In this example, hydrochloric acid of a certain concentration is used as a scale inhibitor, and an intermittent operation mode is adopted (cleaning is performed every 5 days). To avoid the influence of chloride ions in hydrochloric acid on COD detection, the scale inhibitor is added after the monitoring equipment has completed sampling and testing.

[0062] The effective volume of the scale inhibition tank 2 is 100mL. A water inlet / air vent 21 is provided in the middle area of ​​the bottom of the scale inhibition tank 2. A transparent plastic tube with an inner diameter of 3 mm is connected to the outside. The plastic tube is connected to the quantitative hose of the water sample delivery pump 12 (peristaltic pump, with a delivery flow rate set to 100mL / min). The other end of the quantitative hose is connected to the water outlet pipe of the water sample preparation device 1.

[0063] The scale inhibitor storage bottle 31 has an effective volume of 2000 mL. Its cap has a vent and a vertical plastic tube (bottom end located 0.5 cm above the bottom of the bottle) connecting the dosing tube to the scale inhibitor inside. The dosing pump 33 is a micro peristaltic pump with a dosing flow rate of 20 μL / s and a dosing time of 50 seconds. Under agitation conditions, the scale inhibitor is added to lower the pH of the scale inhibition tank water sample to approximately 1.0. Then, agitation is stopped, and the acidified water sample from the scale inhibition tank is extracted using the sampling tube 41 and sampling pump 42 of the online monitoring device 4, filling the pipeline and internal liquid space. This process is maintained for 30 minutes, and then the acidified solution is returned to the scale inhibition tank. Subsequently, the acidified solution is further transported to the online monitoring device 4 via the reverse direction of the water sample transfer pump 12, filling the pipeline. After a 30-minute contact reaction, the water sample transfer pump 12 rotates forward again, transporting the acidified solution to the scale inhibition tank until the liquid level reaches the overflow hole. Then the water sample transfer pump 12 reverses again, directly pumping all the water sample from the scale inhibition tank 2 into the water sample preparation device 1, and then discharging it through the water sample preparation device 1.

[0064] The scaling problem of online monitoring equipment is effectively solved by using the device described in this invention, resulting in more stable measurement data. This device has a simple structure and low operation and maintenance costs.

[0065] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A scale inhibition device for online monitoring equipment, characterized in that, A scale inhibition tank and scale inhibitor dosing device are installed between the water sample preparation device and the online monitoring equipment; The output end of the water sample preparation device is connected to the water inlet / air hole at the bottom of the scale inhibition tank via a water / air supply pipe. The scale inhibitor dosing device includes a scale inhibitor storage bottle, a scale inhibitor dosing pipe, and a dosing pump. The output end of the scale inhibitor storage bottle is connected to the scale inhibitor dosing hole of the scale inhibition tank through the scale inhibitor dosing pipe, and the dosing pump is installed on the scale inhibitor dosing pipe. The monitoring sampling port of the scale inhibition tank is connected to the sampling end of the online monitoring equipment through a sampling tube.

2. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, The water / air delivery pipe is equipped with a water sample delivery pump that can operate in both forward and reverse directions, used to extract water samples from the water sample preparation device or scale inhibition tank, or to extract air.

3. The scale inhibition device for online monitoring equipment according to claim 2, characterized in that, The water sample transfer pump is a peristaltic pump, which achieves a flow rate of 10-30 mL / min.

4. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, The scale inhibitor storage bottle is a relatively sealed plastic bottle with a vent, and has an effective volume of 500-5000mL.

5. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, The dosing pump is a peristaltic pump, and its dosing flow rate accuracy can achieve precise dosing of 0.6-6.0 mL / min.

6. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, The top of the scale inhibition tank is sealed by a stopcock.

7. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, A water sample overflow hole is provided between the scale inhibitor dosing hole and the monitoring sampling hole on the scale inhibition tank. The vertical distance between the scale inhibitor dosing hole, the water sample overflow hole, and the monitoring sampling hole is 1.5-3 cm.

8. The scale inhibition device for online monitoring equipment according to claim 1 or 7, characterized in that, The monitoring sampling port is located at 50-80% of the liquid level in the scale inhibition tank.

9. The scale inhibition device for online monitoring equipment according to claim 7, characterized in that, An overflow pipe is provided at the overflow hole of the water sample.

10. The scale inhibition device for online monitoring equipment according to claim 1, characterized in that, The sampling tube is equipped with a sampling pump.

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