A smart circulating water simulation test device and its control method

Abstract

This invention belongs to the field of circulating water dynamic simulation test technology, and discloses an intelligent circulating water simulation test device and its control method. The test device includes: a raw water tank, a main frame, and a host computer. An automatic acid addition mechanism is provided on one side of the raw water tank; a cooling tower, a test solution tank, and a circulating water pump are arranged inside the main frame; a heating mechanism, a float flow meter, and a control panel are arranged on the top side of one side of the main frame; an automatic sampling mechanism and an automatic sewage discharge mechanism are arranged on the bottom side of one side of the main frame; and an automatic titration mechanism is arranged on the side of the host computer. This invention, by integrating multiple sensors and an automatic control system, realizes the automated control of the circulating water dynamic simulation test process, improves the efficiency and safety of the circulating water dynamic simulation test, and reduces the labor intensity and error rate of manual operation.

Description

Technical Field

[0001] This invention relates to the field of circulating water dynamic simulation test technology, and in particular to an intelligent circulating water simulation test device and its control method. Background Technology

[0002] In thermal power plants, circulating cooling water consumption typically accounts for 80% to 90% of the total water consumption of the entire plant. Given the expansion of unit size and the scarcity of water resources, increasing the concentration ratio of circulating water has become an increasingly important issue.

[0003] In open-loop circulating cooling water systems with poor water quality, scaling and corrosion can occur, threatening equipment safety and economic efficiency. Adding scale and corrosion inhibitors is a primary method for controlling scaling in circulating cooling water systems. However, due to variations in water quality and process conditions, different scale and corrosion inhibitors must be selected for treatment.

[0004] Therefore, performance evaluation of scale and corrosion inhibitors for circulating water becomes crucial. Typically, static scale inhibition methods, bubbling methods, and limiting carbonate methods are used to assess the scale inhibition effect of agents, while methods such as the rotating plate method and electrochemical corrosion testing are used to evaluate the corrosion inhibition performance. These methods are suitable for comparing and screening different agents or different dosages of the same agent.

[0005] However, to determine the suitability of reagents under specific dosing and process conditions, dynamic simulation testing has become a more suitable option. Existing circulating water dynamic simulation tests are time-consuming, require large amounts of water, and rely on manual operation, such as manual sewage discharge and water replenishment. This is not only inefficient but also prone to equipment damage due to operational errors. Furthermore, systems lacking automated control cannot monitor and adjust water quality in real time, resulting in unstable treatment effects.

[0006] Therefore, how to provide an intelligent circulating water simulation test device and its control method is an urgent problem to be solved. Summary of the Invention

[0007] This invention provides an intelligent circulating water simulation test device and its control method to solve the above-mentioned technical problems existing in the prior art.

[0008] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0009] According to a first aspect of the present invention, an intelligent circulating water simulation test device is provided.

[0010] In one embodiment, the intelligent circulating water simulation test device includes: a raw water tank, a main frame, and a host computer. An automatic acid addition mechanism is provided on one side of the raw water tank. A cooling tower, a test liquid tank, and a circulating water pump are provided inside the main frame. A heating mechanism, a float flow meter, and a control panel are provided on the top side of one side of the main frame. An automatic sampling mechanism and an automatic sewage discharge mechanism are provided on the bottom side of one side of the main frame. An automatic titration mechanism is provided on the side of the host computer.

[0011] In one embodiment, the automatic acid dosing mechanism includes an acid dosing tank, an acid dosing metering pump is installed on the top of the acid dosing tank, and the acid dosing metering pump is connected to the raw water tank by a pipeline.

[0012] In one embodiment, the cooling tower is located on the top side of the main frame, and an air outlet is provided at the top of the cooling tower, with a centrifugal fan installed inside the air outlet.

[0013] In one embodiment, the test tank is located in the middle of the main frame, directly below the cooling tower, and the test tank is connected to the cooling tower by a pipeline.

[0014] In one embodiment, the test solution tank is connected to the raw water tank by a pipeline, and a raw water pump is provided between the test solution tank and the raw water tank.

[0015] In one embodiment, both the raw water tank and the test liquid tank are equipped with level sensors. The raw water tank is made of PE material, and the test liquid tank is made of acrylic material.

[0016] In one embodiment, the heating mechanism includes a primary heating tube and a secondary heating tube disposed on the top side of the main frame, the primary heating tube and the secondary heating tube being parallel to each other, and the primary heating tube being close to the float flow meter;

[0017] A first temperature sensor is installed at the bottom of the primary heating tube, and a second temperature sensor is installed at the top of the secondary heating tube.

[0018] In one embodiment, the cooling tower is connected to the top of the secondary heating pipe via a pipe, the bottom of the secondary heating pipe is connected to the top of the primary heating pipe via a pipe, and the bottom of the primary heating pipe is connected to the top of the float flowmeter via a pipe.

[0019] The first temperature sensor is located between the cooling tower and the secondary heating tube, and the second temperature sensor is located between the primary heating tube and the float flow meter.

[0020] In one embodiment, the circulating water pump is connected at both ends to the float flow meter and the test liquid tank, forming a circulating water system consisting of the test liquid tank, the circulating water pump, the float flow meter, the primary heating pipe, the secondary heating pipe, and the cooling tower.

[0021] In one embodiment, a conductivity meter, a pH meter, a circulating water tank thermometer, an inlet water thermometer, an outlet water thermometer, and a control knob are provided on one side of the control panel.

[0022] In one embodiment, the cooling tower is provided with porous filter media inside, and the cooling tower has a spray cooling function.

[0023] In one embodiment, the test solution tank is connected by pipes to the automatic sampling mechanism and the automatic sewage discharge mechanism, and the test solution tank is connected by pipes to the automatic titration mechanism.

[0024] According to a second aspect of the present invention, a control method for an intelligent circulating water simulation test device is provided.

[0025] In one embodiment, the control method of the intelligent circulating water simulation test device includes:

[0026] The liquid level inside the raw water tank and the test liquid tank is monitored in real time. When the extraction conditions are met, the raw water in the raw water tank is transported to the test liquid tank using the raw water pump.

[0027] The circulating water pump draws the test solution from the test solution tank and, in the direction of the circulating water, sequentially passes through the float flow meter, the first-stage heating tube, and the second-stage heating tube before entering the cooling tower. The real-time flow rate and inlet / outlet temperature of the circulating water are monitored in real time.

[0028] Based on the inlet and outlet temperatures of the circulating water, the centrifugal fan is started and operated to cool the circulating water until it returns to the test tank.

[0029] Set the automatic sampling time, periodically schedule the automatic sampling mechanism to perform automatic sampling, use the automatic titration mechanism to titrate the extracted water sample, and set and based on the preset automatic acid addition parameters, control the automatic acid addition mechanism to adjust the water quality according to the pH value change of the water sample when the acid addition conditions are met.

[0030] Based on the conductivity monitored in real time by the conductivity meter, the automatic sewage discharge mechanism is controlled to perform automatic sewage discharge, and the test data of the circulating water is displayed and recorded in real time by the host computer.

[0031] In one embodiment, the real-time monitoring of the liquid levels inside the raw water tank and the test solution tank, and the use of a raw water pump to transport the raw water from the raw water tank to the test solution tank when the extraction conditions are met, includes:

[0032] The raw water level is detected by a liquid level sensor inside the raw water tank. When the raw water level is lower than a preset raw water level threshold, the raw water pump is controlled to stop working.

[0033] The liquid level of the test solution is detected by a liquid level sensor inside the test solution tank. When the liquid level of the test solution is lower than the preset liquid level threshold and the liquid level of the raw water is higher than the preset raw water level threshold, the raw water pump is controlled to start working to transport the raw water in the raw water tank to the test solution tank.

[0034] In one embodiment, the driving circulating water pump draws the test solution from the test solution tank, and according to the circulating water direction, it sequentially passes through a float flow meter, a primary heating pipe, and a secondary heating pipe before entering the cooling water tower. Real-time monitoring of the circulating water flow rate and inlet / outlet temperature includes:

[0035] The liquid level inside the test solution tank is monitored in real time. When the liquid level is lower than the preset liquid level threshold, the raw water pump is activated to draw raw water to replenish the liquid in the test solution tank. At the same time, the circulating water pump is used to draw the test solution and start circulation. When the liquid level is higher than or equal to the preset liquid level threshold, the replenishment of the raw water pump is stopped, and the circulating water pump continues to draw and drive the test solution to circulate, forming circulating water.

[0036] The first temperature sensor detects the inlet temperature of the circulating water. Based on the set temperature value, the first-stage heating tube and the second-stage heating tube are activated to heat the circulating water. The second temperature sensor detects the outlet temperature of the circulating water until it enters the cooling tower.

[0037] The flow rate of circulating water is monitored in real time using a float flow meter. When the flow rate of circulating water is lower than the preset threshold, the water cut-off protection function is activated, heating is stopped, and an alarm is triggered.

[0038] In one embodiment, controlling the centrifugal fan to start and operate based on the inlet and outlet temperatures of the circulating water to cool the circulating water until the circulating water returns to the test solution tank includes:

[0039] The outlet temperature of the circulating water is obtained. If the outlet temperature is greater than the cooling temperature threshold, the centrifugal fan is started to cool the circulating water inside the cooling tower. If the outlet temperature is less than the cooling temperature threshold, the centrifugal fan is stopped.

[0040] The technical solution provided by this invention can include the following beneficial effects: This invention is applicable to the design, manufacturing, installation, and commissioning of equipment related to a circulating water dynamic simulation test device. Through a two-stage heating-cooling-water quality detection-operating condition control process, the main process adopts a water supply tank—circulating water tank—booster pump—flow meter—primary heating—secondary heating—cooling tower—circulating water tank. The entire device achieves automatic operation and centralized data acquisition. By integrating multiple sensors and an automatic control system, automated control of the circulating water dynamic simulation test process is realized, improving the efficiency and safety of the circulating water dynamic simulation test, while reducing the labor intensity and error rate of manual operation.

[0041] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] Figure 1 This is a three-dimensional structural schematic diagram of an intelligent circulating water simulation test device according to an exemplary embodiment;

[0044] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0045] Figure 3 This is a front view of an intelligent circulating water simulation test apparatus according to an exemplary embodiment;

[0046] Figure 4 yes Figure 3 Enlarged view of a section at point B in the middle;

[0047] Figure 5 This is a top view of an intelligent circulating water simulation test apparatus according to an exemplary embodiment;

[0048] Figure 6 This is a side view of an intelligent circulating water simulation test apparatus according to an exemplary embodiment;

[0049] Figure 7 This is a flowchart illustrating a control method for an intelligent circulating water simulation test device according to an exemplary embodiment.

[0050] Figure label:

[0051] 1. Raw water tank; 2. Main frame; 3. Host computer; 4. Automatic acid dosing mechanism; 401. Acid dosing tank; 402. Acid dosing metering pump; 5. Cooling tower; 6. Test solution tank; 7. Circulating water pump; 8. Heating mechanism; 801. Primary heating element; 802. Secondary heating element; 803. First temperature sensor; 804. Second temperature sensor; 9. Float flow meter; 10. Control panel; 11. Automatic sampling mechanism; 12. Automatic sewage discharge mechanism; 13. Automatic titration mechanism; 14. Air outlet; 15. Centrifugal fan; 16. Raw water pump; 17. Conductivity meter; 18. pH meter; 19. Circulating water tank thermometer; 20. Inlet water thermometer; 21. Outlet water thermometer; 22. Control knob. Detailed Implementation

[0052] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0053] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0054] In this document, unless otherwise stated, the term "multiple" means two or more.

[0055] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0056] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0057] It should be understood that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order constraint on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the diagram may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0058] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0059] Figures 1-6 An embodiment of an intelligent circulating water simulation test device of the present invention is shown.

[0060] In this optional embodiment, the intelligent circulating water simulation test device includes a raw water tank 1, a main frame 2, and a host computer 3. An automatic acid addition mechanism 4 is provided on one side of the raw water tank 1. A cooling tower 5, a test liquid tank 6, and a circulating water pump 7 are provided inside the main frame 2. A heating mechanism 8, a float flow meter 9, and a control panel 10 are provided on the top side of one side of the main frame 2. An automatic sampling mechanism 11 and an automatic sewage discharge mechanism 12 are provided on the bottom side of one side of the main frame 2. An automatic titration mechanism 13 is provided on one side of the host computer 3.

[0061] In this optional embodiment, the automatic acid dosing mechanism 4 includes an acid dosing tank 401, and an acid dosing metering pump 402 is provided on the top of the acid dosing tank 401. The acid dosing metering pump 402 is connected to the raw water tank 1 by a pipeline.

[0062] In this optional embodiment, the cooling tower 5 is located on the top side inside the main frame 2, and an air outlet 14 is provided at the top of the cooling tower 5. A centrifugal fan 15 is provided inside the air outlet 14.

[0063] In this optional embodiment, the test liquid tank 6 is located in the middle of the main frame 2, directly below the cooling tower 5, and the test liquid tank 6 is connected to the cooling tower 5 by a pipeline.

[0064] In this optional embodiment, the test solution tank 6 is connected to the raw water tank 1 by a pipeline, and a raw water pump 16 is provided between the test solution tank 6 and the raw water tank 1.

[0065] Specifically, the raw water tank has a capacity of approximately 300L and is made of PE material, meeting non-toxic and odorless food-grade standards. A low-level sensor is installed inside the tank. When the water level is low, the equipment alarms and the raw water pump stops working. When the water level rises above the low level, the raw water pump starts. This level-linked system enables automatic operation of the raw water pump while simultaneously protecting it from damage due to cavitation. The tank is equipped with an automatic drain valve for automatic drainage. A manual drain valve is also provided for emergency manual drainage, ensuring the tank is emptied as much as possible.

[0066] In this optional embodiment, both the raw water tank 1 and the test liquid tank 6 are equipped with liquid level sensors. The raw water tank 1 is made of PE material, and the test liquid tank 6 is made of acrylic material.

[0067] Specifically, the test solution tank 6, approximately 60L in volume, is made of acrylic and is used to store and regulate the test water, as well as to achieve a circulating water concentration function. The raw water pump 16 pressurizes the liquid in the raw water tank 1 to the test solution tank 6, with automatic water replenishment linked to the liquid level. The circulating pump starts when the test solution tank 6 is at a high liquid level and stops when it falls below the low liquid level. When the test solution tank 6 is at a low liquid level, the raw water pump starts to automatically replenish the water, and the automatic replenishment ends when the liquid level in the test solution tank 6 reaches the high liquid level. The test solution tank 6 is equipped with a conductivity probe, pH probe, temperature probe, and liquid level probe to monitor the conductivity, pH, temperature, and liquid level of the circulating water within the tank. Contact between the probes and the test solution tank should be avoided. Data is transmitted through the sensors to secondary meters such as a conductivity meter, pH meter, and temperature display, and is linked with the acid addition and chemical dosing systems via a host computer to achieve functions such as automatic discharge of excess water and automatic water quality regulation. The bottom of the test liquid tank 6 is equipped with a manual drain ball valve and a drain pipe. When the liquid in the test liquid tank needs to be drained, the manual drain ball valve is opened manually to achieve the drain function.

[0068] If the conductivity is higher than the set upper limit, the drain valve will be activated; if it is lower than the lower limit, the drain will be stopped. Within the set drain range, the drain will be discharged for a set time equal to the weight, and at set intervals, the drain will be discharged on a timed basis.

[0069] In this optional embodiment, the heating mechanism 8 includes a primary heating tube 801 and a secondary heating tube 802 disposed on the top side of the main frame 2. The primary heating tube 801 and the secondary heating tube 802 are parallel to each other, and the primary heating tube 801 is close to the float flowmeter 9. A first temperature sensor 803 is disposed at the bottom of the primary heating tube 801, and a second temperature sensor 804 is disposed at the top of the secondary heating tube 802.

[0070] In this optional embodiment, the cooling tower 5 is connected to the top of the secondary heating pipe 802 by a pipe, the bottom of the secondary heating pipe 802 is connected to the top of the primary heating pipe 801 by a pipe, and the bottom of the primary heating pipe 801 is connected to the top of the float flow meter 9 by a pipe; the first temperature sensor 803 is located between the cooling tower 5 and the secondary heating pipe 802, and the second temperature sensor 804 is located between the primary heating pipe 801 and the float flow meter 9.

[0071] In this optional embodiment, the two ends of the circulating water pump 7 are respectively connected to the float flow meter 9 and the test liquid tank 6, forming a circulating water system consisting of the test liquid tank 6, the circulating water pump 7, the float flow meter 9, the primary heating tube 801, the secondary heating tube 802, and the cooling tower 5.

[0072] In this optional embodiment, a conductivity meter 17, a pH meter 18, a circulating water tank thermometer 19, an inlet water thermometer 20, an outlet water thermometer 21, and a control knob 22 are provided on one side of the control panel 10.

[0073] In this optional embodiment, the cooling tower 5 is provided with porous filter media inside, and the cooling tower 5 has a spray cooling function.

[0074] In this optional embodiment, the test solution tank 6 is connected by pipes to the automatic sampling mechanism 11 and the automatic sewage discharge mechanism 12, and the test solution tank 6 is connected by pipes to the automatic titration mechanism 13.

[0075] Figure 7 An embodiment of the control method of an intelligent circulating water simulation test device of the present invention is shown.

[0076] In this optional embodiment, the control method of the intelligent circulating water simulation test device includes:

[0077] Step S101: Monitor the liquid level values ​​inside the raw water tank 1 and the test liquid tank 6 in real time. When the extraction conditions are met, use the raw water pump 16 to transport the raw water in the raw water tank 1 to the test liquid tank 6.

[0078] Step S103: Drive the circulating water pump 7 to extract the test solution from the test solution tank 6, and in the direction of circulating water, pass through the float flow meter 9, the first-stage heating tube 801 and the second-stage heating tube 802 in sequence into the cooling water tower 5, and monitor the real-time flow rate and inlet and outlet temperature of the circulating water in real time.

[0079] Step S105: Based on the inlet and outlet temperatures of the circulating water, control the centrifugal fan 15 to start and run, cool the circulating water until the circulating water returns to the test liquid tank 6;

[0080] Step S107: Set the automatic sampling time, periodically schedule the automatic sampling mechanism 11 to perform automatic sampling, use the automatic titration mechanism 13 to titrate the extracted water sample, and set and based on the preset automatic acid addition parameters, control the automatic acid addition mechanism 4 to adjust the water quality according to the pH value change of the water sample when the acid addition conditions are met.

[0081] Step S109: Based on the conductivity monitored in real time by the conductivity meter 17, control the automatic sewage discharge mechanism 12 to perform automatic sewage discharge, and display and record the test data of the circulating water in real time through the host computer 3.

[0082] In this optional embodiment, the real-time monitoring of the liquid level values ​​inside the raw water tank 1 and the test liquid tank 6, and the use of the raw water pump 16 to transport the raw water in the raw water tank 1 to the test liquid tank 6 when the extraction conditions are met, includes: using a liquid level sensor inside the raw water tank 1 to detect the raw water level; when the raw water level is lower than a preset raw water level threshold, controlling the raw water pump 16 to stop working; using a liquid level sensor inside the test liquid tank 6 to detect the test liquid level; when the test liquid level is lower than a preset test liquid level threshold and the raw water level is higher than a preset raw water level threshold, controlling the raw water pump 16 to start working and transport the raw water in the raw water tank 1 to the test liquid tank 6.

[0083] In this optional embodiment, the driving circulating water pump 7 draws the test solution from the test solution tank 6, and according to the circulating water direction, it sequentially passes through the float flow meter 9, the primary heating tube 801, and the secondary heating tube 802 before entering the cooling tower 5. Real-time monitoring of the circulating water flow rate and inlet / outlet temperature includes: real-time monitoring of the test solution level inside the test solution tank 6; when the test solution level is lower than a preset test solution level threshold, the raw water pump 16 is activated to draw raw water to replenish the test solution tank 6; simultaneously, the circulating water pump 7 draws the test solution, initiating circulation; when the test solution level is higher than or equal to a preset test solution level threshold... When the water level reaches the threshold, the replenishment of the raw water pump 16 is stopped, while the circulating water pump 7 continues to draw and circulate the driving test solution to form circulating water. The first temperature sensor 803 detects the inlet temperature of the circulating water, and according to the set temperature value, the first-stage heating tube 801 and the second-stage heating tube 802 are controlled to start heating the circulating water. The second temperature sensor 804 detects the outlet temperature of the circulating water until it enters the cooling tower 5. The flow rate of the circulating water is monitored in real time by the float flow meter 9. When the flow rate of the circulating water is lower than the preset threshold, the water cut-off protection function is activated, heating is stopped, and an alarm is triggered.

[0084] In this optional embodiment, controlling the centrifugal fan 15 to start and run based on the inlet and outlet temperatures of the circulating water to cool the circulating water until the circulating water returns to the test liquid tank 6 includes: obtaining the outlet temperature of the circulating water; if the outlet temperature is greater than the cooling temperature threshold, starting the centrifugal fan 15 to cool the circulating water inside the cooling tower 5; if the outlet temperature is less than the cooling temperature threshold, stopping the centrifugal fan 15.

[0085] The intelligent circulating water simulation test device and its control method are described in detail below with reference to the accompanying drawings and specific embodiments.

[0086] Circulating water pump 7: Used to circulate the water in the test solution tank to the cooling water tower.

[0087] Heating mechanism 8: includes two sets of heating tubes connected in series for heating circulating water.

[0088] Water shortage protection unit (not shown in the figure): used to automatically stop heating when the heating system is short of water to prevent equipment damage.

[0089] Temperature sensors (including a first temperature sensor 803 and a second temperature sensor 804): used to monitor the inlet and outlet temperatures of the heating unit and the temperature of the circulating water.

[0090] Centrifugal fan 15: Used to control the spray cooling function of the cooling tower.

[0091] Float flowmeter 9: Used to display the flow rate of circulating water in the system.

[0092] Valves (not shown in the figure): Used to control the flow rate of the system's circulating water.

[0093] The experimental setup utilizes a circulating water pump 7 to circulate the test water, which pumps the water from the test solution tank 6 into the cooling tower 5. The water sample is heated before entering the cooling tower 5. Two sets of water sample heating units are installed, which can be connected in series or in parallel via a switching circuit, allowing for easy disconnection of either stage and diversification of power and efficiency. A flow meter is installed on this water path, and the power of the two-stage heating system is manually adjustable according to actual demand.

[0094] For safety reasons, a water shortage protection unit must be installed. When the heating system experiences a water shortage, a non-contact level gauge will automatically stop heating to prevent damage to the heating unit. Additionally, inlet and outlet water temperature sensors will be used to automatically shut off the heating unit when the temperature is too high (above 65°C). The cooling tower 5 is filled with porous filter media to increase the surface area in contact with the circulating water, improving heat dissipation efficiency and ensuring uniform distribution of the circulating water for water sample spray cooling. A centrifugal fan 15 is installed at the top of the cooling tower 5, and a temperature sensor controls the temperature of the circulating water. The fan starts when the temperature is higher than the set temperature and stops when the temperature is lower than the set temperature.

[0095] Automatic sampling mechanism 11: Used for periodic automatic sampling. It takes samples every 6-8 hours. A time relay is linked to a solenoid valve; upon reaching the set time, the solenoid valve automatically opens to sample 200L of liquid. It also works with an automatic sampling rotating disc, which automatically rotates to the next blank water sample bottle after sampling is complete. The obtained samples can be used for manual titration or for retention verification tests. It should be noted that the automatic sampling mechanism 11 includes a sampling tube connected to the test liquid tank 6, such as... Figure 4 As shown, it also includes a sampling receiving tray located below the sampling tube, such as... Figure 5 As shown, the sampling tube can directly add the collected water sample to the sampling tray.

[0096] Automatic Acid Addition Mechanism 4: The test device is linked to the automatic acid addition mechanism 4 via a pH meter 18 or alkalinity meter. The linkage with any instrument and indicator can be customized. A 4-20mA signal is transmitted to the host computer, which calculates the required pH or alkalinity values ​​using proportional relationships to automatically add acid and adjust water quality, ensuring accurate dosage. When adding acid via pH control, the sulfuric acid addition rate must be controlled; it is recommended that the rate not exceed 1ml / min. After adding sulfuric acid, a minimum interval of 10 minutes should be observed to assess the acid addition effect, ensuring a complete reaction and accurate results. A control program can be added to set the dosing time and stop time once the dosing range is reached. The acid addition rate and dosing pump can be manually adjusted.

[0097] When adding acid is controlled by alkalinity, the calculation is as follows:

[0098] Based on experience, power plants generally control alkalinity (JD) to 6 mmol / L or below, i.e., JD ≤ 6.0 mmol / L, with a concentrated sulfuric acid concentration of 18.4 mol / L. If the raw water alkalinity is 4.20 mmol / L and the target concentration ratio is 5.0, then acid should be added before concentration to adjust the alkalinity to 1.20 mmol / L. When adding one 25L tank of raw water, based on the JD to sulfuric acid equivalent ratio, the required sulfuric acid volume is (4.20 - 1.20) * 25 / 18.4 / 2 = 2.0 ml.

[0099] Automatic sewage discharge mechanism 12: The test device automatically discharges sewage based on conductivity meter readings or concentration ratio values. The linkage with specific indicators can be set manually. Data is uploaded to the host computer via a 4-20mA signal. Automatic discharge of sewage exceeding standards is achieved by controlling the opening / closing of electromagnetic switches based on the actual set values. Dual protection mechanisms, including manual discharge functionality, are also required.

[0100] The automatic monitoring system draws 200 mL of circulating water from test tank 6 into the system for automatic monitoring of key indicators of the circulating water test, including alkalinity, chloride ion concentration, calcium hardness, magnesium hardness, and total hardness using automatic potentiometric titration. It automatically calculates the concentration ratio based on chloride ion concentration or conductivity value and automatically discharges wastewater if the concentration ratio exceeds a preset value. The system can be set to periodically calculate the chloride and calcium ion concentration concentration ratios, and calculate the difference ΔB between them. When ΔB ≥ 0.2, it represents the limiting carbonate hardness of the test, and the chloride concentration concentration ratio under this condition is the maximum concentration ratio for the test. Monitoring data is simultaneously uploaded to the monitoring system software.

[0101] A circulating water scale and corrosion inhibitor concentration monitoring device (not shown in the figure) detects the concentration of the circulating fluorescent agent using a fluorescence method. The concentration of the circulating scale and corrosion inhibitor is then calculated based on the concentration relationship between the scale inhibitor and the fluorescent agent. The amount of scale and corrosion inhibitor added is adjusted to maintain the correct concentration within the circulating water system. The data is simultaneously uploaded to the monitoring system software. The scale and corrosion inhibitor concentration can be determined based on the concentration of the fluorescent agent in the scale and corrosion inhibitor. For example, with a 1:500 fluorescent agent (i.e., 1 kg of fluorescent agent is added to 500 kg of scale and corrosion inhibitor), if the detected fluorescent agent concentration is 0.01 mg / L, then the scale and corrosion inhibitor concentration is 5 mg / L.

[0102] Host Computer 3: The experimental setup is controlled via the host computer, which displays the inlet and outlet temperatures of the heating unit. The PLC controls the inlet and outlet temperature difference to be between 3 and 8°C. A temperature sensor is installed inside the water tank, which is linked to the fan via a 4-20mA signal. A level sensor is linked to the drain valve via a level signal. The host computer collects signals such as pH, conductivity, alkalinity, chloride ion concentration, calcium hardness, magnesium hardness, total hardness, and fluorescent agent concentration, and links these signals with the acid addition, chemical dosing, and drain systems to achieve automatic discharge of excess water and automatic water quality adjustment. The temperature sensor is also integrated into the PLC. Simultaneously, the three temperature sensors, conductivity meter, and pH meter are remotely displayed. The host computer can not only plot experimental data but also automatically generate real-time trend curves. Real-time and historical data curves are automatically saved and can be viewed and retrieved at any time.

[0103] Furthermore, the control method for the intelligent circulating water simulation test device may include the following aspects:

[0104] 1. The low liquid level sensor of raw water tank 1 detects the liquid level. When the liquid level is lower than the set value, the raw water pump stops working to prevent the pump from running dry.

[0105] 2. The automatic water replenishment system of the test liquid tank 6 automatically replenishes water according to the feedback of the liquid level sensor. When the liquid level is lower than the set low liquid level value, the raw water pump starts.

[0106] 3. The circulating water pump 7 automatically starts and stops according to the liquid level of the test liquid tank 6. When the liquid level is lower than the set low liquid level, the circulating water pump 7 stops working; when the liquid level is higher than the set low liquid level, the circulating water pump 7 starts, realizing the water circulation operation mode.

[0107] 4. The heating mechanism 8 automatically adjusts the heating power based on feedback from the temperature sensor, and the water shortage protection unit automatically stops heating when water is insufficient. The primary and secondary heating stages are controlled by sensors to activate the heating elements. The PLC calculates the power setpoint based on the set temperature, alarm temperature, and time elapsed. The heating element temperature is controlled in real-time to achieve automatic heating. The primary and secondary heating stages are connected to the PLC via liquid level sensors to implement heating functions based on the set liquid level, triggering a water shortage alarm and automatic power-off to stop heating.

[0108] 5. The centrifugal fan 15 automatically starts and stops according to the temperature of the circulating water, achieving temperature control. The centrifugal fan 15 is controlled by a temperature sensor in the test tank connected to the PLC. Temperature over-temperature alarms are set based on the upper and lower temperature limits, and the fan starts to cool the water during circulation.

[0109] 6. The automatic sampling mechanism 11 samples at set times according to the time relay settings. The automatic sampling solenoid valve is linked with the PLC through the time relay for timing. For example, the sampling time is defined at 8:00, and the timed sampling, remaining time, and sampling time settings are used to complete the sampling of a fixed amount of water.

[0110] 7. The automatic acid dosing mechanism 4 automatically adjusts the amount of acid added based on the pH meter reading. The experimental device is linked with the automatic pH meter and the automatic acid dosing device, transmitting the data to the host computer via a 4-20mA signal. This allows for automatic adjustment of the water quality based on the required pH value, ensuring accurate dosage.

[0111] 8. The automatic sewage discharge mechanism 12 automatically discharges sewage based on the reading of the conductivity meter. The automatic sewage discharge solenoid valve is linked with the PLC for timing via conductivity, for example, 2000 μS / CM is defined as the sewage discharge value, and the automatic sewage discharge device is completed by setting the sampling conductivity, interval time, and sampling time.

[0112] 9. The automatic titration mechanism 13 titrates the water sample to measure alkalinity, chloride ion concentration, calcium hardness, and hardness.

[0113] 10. The host computer 3 displays and controls the entire system in real time through PLC programming, including monitoring temperature, conductivity and pH value, recording and uploading titration data, as well as alarm information and historical data storage.

[0114] Through the above embodiments, the intelligent circulating water dynamic simulation test device and its control method of the present invention can effectively realize the automated control of the test process, and improve the test efficiency and safety.

[0115] This invention is not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. An intelligent circulating water simulation test device, characterized in that, It includes a raw water tank (1), a main frame (2) and a host computer (3), and an automatic acid addition mechanism (4) is provided on one side of the raw water tank (1). The main frame (2) is equipped with a cooling tower (5), a test liquid tank (6) and a circulating water pump (7). The top of one side of the main frame (2) is equipped with a heating mechanism (8), a float flow meter (9) and a control panel (10). The bottom of one side of the main frame (2) is equipped with an automatic sampling mechanism (11) and an automatic sewage discharge mechanism (12). The host computer (3) is equipped with an automatic titration mechanism (13) on one side. The automatic acid addition mechanism (4) includes an acid dosing tank (401), and an acid dosing metering pump (402) is installed on the top of the acid dosing tank (401). The acid dosing metering pump (402) is connected to the raw water tank (1) by a pipeline. The cooling tower (5) is located on the top side inside the main frame (2). An air outlet (14) is provided at the top of the cooling tower (5), and a centrifugal fan (15) is provided inside the air outlet (14). The test liquid tank (6) is connected to the raw water tank (1) by a pipeline, and a raw water pump (16) is provided between the test liquid tank (6) and the raw water tank (1). The heating mechanism (8) includes a primary heating tube (801) and a secondary heating tube (802) disposed on the top of one side of the main frame (2). The primary heating tube (801) and the secondary heating tube (802) are parallel to each other, and the primary heating tube (801) is close to the float flowmeter (9). A first temperature sensor (803) is provided at the bottom of the first-stage heating tube (801), and a second temperature sensor (804) is provided at the top of the second-stage heating tube (802). The control panel (10) is equipped with a conductivity meter (17), a pH meter (18), a circulating water tank thermometer (19), an inlet water thermometer (20), an outlet water thermometer (21), and a control knob (22) on one side. The automatic sampling mechanism (11) performs automatic sampling periodically, and the automatic titration mechanism (13) titrates the extracted water sample and adjusts the water quality based on the preset automatic acid addition parameters and the pH value of the water sample. When the acid addition conditions are met, the automatic acid addition mechanism (4) adjusts the water quality.

2. The intelligent circulating water simulation test device according to claim 1, characterized in that, The test liquid tank (6) is located in the middle of the main frame (2), and the test liquid tank (6) is located directly below the cooling tower (5), and the test liquid tank (6) is connected to the cooling tower (5) by a pipeline.

3. The intelligent circulating water simulation test device according to claim 2, characterized in that, Both the raw water tank (1) and the test liquid tank (6) are equipped with liquid level sensors. The raw water tank (1) is made of PE material, and the test liquid tank (6) is made of acrylic material.

4. The intelligent circulating water simulation test device according to claim 3, characterized in that, The cooling tower (5) is connected to the top of the secondary heating pipe (802) by a pipe, the bottom of the secondary heating pipe (802) is connected to the top of the primary heating pipe (801) by a pipe, and the bottom of the primary heating pipe (801) is connected to the top of the float flow meter (9) by a pipe. The first temperature sensor (803) is located between the cooling tower (5) and the secondary heating tube (802), and the second temperature sensor (804) is located between the primary heating tube (801) and the float flow meter (9).

5. The intelligent circulating water simulation test device according to claim 4, characterized in that, The circulating water pump (7) is connected to the float flow meter (9) and the test liquid tank (6) at both ends, forming a circulating water system consisting of the test liquid tank (6), the circulating water pump (7), the float flow meter (9), the primary heating tube (801), the secondary heating tube (802), and the cooling tower (5).

6. The intelligent circulating water simulation test device according to claim 5, characterized in that, The cooling tower (5) is equipped with porous filter media inside, and the cooling tower (5) has a spray cooling function.

7. The intelligent circulating water simulation test device according to claim 5, characterized in that, The test liquid tank (6) is connected to the automatic sampling mechanism (11) and the automatic sewage discharge mechanism (12) by pipes, and the test liquid tank (6) is connected to the automatic titration mechanism (13) by pipes.

8. A control method for an intelligent circulating water simulation test device, used to implement the control of the intelligent circulating water simulation test device according to any one of claims 1-7, characterized in that, include: Real-time monitoring of the liquid level values ​​inside the raw water tank (1) and the test liquid tank (6) is performed. When the extraction conditions are met, the raw water in the raw water tank (1) is transported to the test liquid tank (6) using the raw water pump (16). Drive the circulating water pump (7) to draw the test liquid from the test liquid tank (6), and in the direction of the circulating water, it passes through the float flow meter (9), the first heating tube (801) and the second heating tube (802) in sequence into the cooling tower (5), and monitor the real-time flow rate and inlet and outlet temperature of the circulating water in real time; Based on the inlet and outlet temperatures of the circulating water, the centrifugal fan (15) is started and operated to cool the circulating water until it returns to the test liquid tank (6). Set the automatic sampling time, periodically schedule the automatic sampling mechanism (11) to perform automatic sampling, use the automatic titration mechanism (13) to titrate the extracted water sample and, based on the preset automatic acid addition parameters, control the automatic acid addition mechanism (4) to adjust the water quality according to the pH value change of the water sample when the acid addition conditions are met. Based on the conductivity monitored in real time by the conductivity meter (17), the automatic sewage discharge mechanism (12) is controlled to perform automatic sewage discharge, and the test data of the circulating water is displayed and recorded in real time by the host computer (3).

9. The control method of the intelligent circulating water simulation test device according to claim 8, characterized in that, The real-time monitoring of the liquid level values ​​inside the raw water tank (1) and the test liquid tank (6), and the use of the raw water pump (16) to transport the raw water in the raw water tank (1) to the test liquid tank (6) when the extraction conditions are met, includes: The raw water level is detected by the liquid level sensor inside the raw water tank (1). When the raw water level is lower than the preset raw water level threshold, the raw water pump (16) is controlled to stop working. The liquid level of the test liquid is detected by the liquid level sensor inside the test liquid tank (6). When the liquid level of the test liquid is lower than the preset liquid level threshold and the liquid level of the raw water is higher than the preset liquid level threshold, the raw water pump (16) is controlled to start working and transport the raw water in the raw water tank (1) to the test liquid tank (6).

10. The control method of the intelligent circulating water simulation test device according to claim 8, characterized in that, The driving circulating water pump (7) draws the test solution from the test solution tank (6), and according to the direction of circulating water, it passes through the float flow meter (9), the first-stage heating pipe (801), and the second-stage heating pipe (802) in sequence before entering the cooling tower (5). The real-time flow rate and inlet and outlet temperatures of the circulating water are monitored in real time, including: The liquid level inside the test liquid tank (6) is monitored in real time. When the liquid level is lower than the preset liquid level threshold, the raw water pump (16) is called to draw raw water to replenish the liquid in the test liquid tank (6). At the same time, the circulating water pump (7) is used to draw the test liquid and start the circulation. When the liquid level is higher than or equal to the preset liquid level threshold, the replenishment of the raw water pump (16) is stopped, and the circulating water pump (7) continues to draw and drive the test liquid to circulate, forming circulating water. The first temperature sensor (803) is used to detect the inlet temperature of the circulating water. According to the set temperature value, the first heating tube (801) and the second heating tube (802) are controlled to start heating the circulating water. The second temperature sensor (804) is used to detect the outlet temperature of the circulating water until it enters the cooling tower (5). The flow rate of circulating water is monitored in real time using a float flow meter (9). When the flow rate of circulating water is lower than the preset threshold, the water cut-off protection function is activated, heating is stopped, and an alarm is triggered.

11. The control method of the intelligent circulating water simulation test device according to claim 8, characterized in that, The process of controlling the centrifugal fan (15) to start and run based on the inlet and outlet temperatures of the circulating water to cool the circulating water until it returns to the test tank (6) includes: The outlet temperature of the circulating water is obtained. If the outlet temperature is greater than the cooling temperature threshold, the centrifugal fan (15) is started to cool the circulating water inside the cooling tower (5). If the outlet temperature is less than the cooling temperature threshold, the centrifugal fan (15) is stopped.

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