Intelligent circulating water simulation test device and control method thereof

Abstract

The invention belongs to the technical field of circulating water dynamic simulation tests, and discloses an intelligent circulating water simulation test device and a control method thereof.The test device comprises a raw water tank, a main body frame and an upper computer, and an automatic acid adding mechanism is arranged on one side of the raw water tank; a cold water tower, a test solution tank and a circulating water pump are arranged in the main body frame, a heating mechanism, a float flowmeter and a control panel are arranged at the top of one side of the main body frame, an automatic sampling mechanism and an automatic pollution discharge mechanism are arranged at the bottom of one side of the main body frame, and an automatic titration mechanism is arranged on one side of the upper computer. By integrating various sensors and an automatic control system, automatic control over the circulating water dynamic simulation test process is achieved, the circulating water dynamic simulation test efficiency and safety are improved, and meanwhile the labor intensity and the error rate of manual operation are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of circulating water dynamic simulation test, and in particular to an intelligent circulating water simulation test device and a control method thereof. Background Art

[0002] In thermal power plants, circulating cooling water consumption usually accounts for 80% to 90% of the total water consumption in the plant. In view of the expansion of unit scale and the shortage of water resources, improving the operating concentration rate of circulating water has become an issue that has received increasing attention.

[0003] In an open circulating cooling water system with poor water quality, the system may suffer from scaling and corrosion problems, which will threaten the operating safety and economic benefits of the equipment. In order to control the scaling problem of the circulating cooling water system, adding scale inhibitors has become a major control method. However, due to differences in water quality and process conditions, different scale inhibitors need to be selected for treatment.

[0004] Therefore, the performance evaluation of circulating water scale and corrosion inhibitors becomes very critical. Usually, static scale inhibition method, bubbling method and limiting carbonate method are used to evaluate the scale inhibition effect of the agent, while the rotating coupon method and electrochemical corrosion test are used to evaluate the corrosion inhibition performance of the agent. These methods are suitable for comparing and screening different agents or different addition amounts of the same agent.

[0005] However, in order to determine the applicability of the reagent under specific dosing and process conditions, dynamic simulation tests have become a more appropriate choice. Existing dynamic simulation tests for circulating water are time-consuming, require a large amount of water, and rely on manual operations, such as manual sewage discharge and water replenishment, which is not only inefficient but also prone to equipment damage due to operational errors. In addition, the lack of automated control systems 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 a control method thereof is a problem that needs to be solved urgently. Summary of the invention

[0007] The embodiment of the present invention provides an intelligent circulating water simulation test device and a control method thereof to solve the above-mentioned technical problems existing in the prior art.

[0008] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0009] According to a first aspect of an embodiment 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, wherein an automatic acid adding mechanism is arranged on one side of the raw water tank; a cooling water tower, a test liquid tank and a circulating water pump are arranged inside the main frame, a heating mechanism, a float flowmeter and a control panel are arranged on the top of one side of the main frame, an automatic sampling mechanism and an automatic sewage discharge mechanism are arranged on the bottom of one side of the main frame, and an automatic titration mechanism is arranged on one side of the host computer.

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

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

[0013] In one embodiment, the test liquid tank is located in the middle position inside the main frame, the test liquid tank is located directly below the cooling water tower, and the test liquid tank is connected to the cooling water tower through a pipeline.

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

[0015] In one embodiment, liquid level sensors are provided inside the raw water tank and the test liquid tank. 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 arranged on the top of one side of the main frame, the primary heating tube and the secondary heating tube are parallel to each other, and the primary heating tube is close to the float flowmeter;

[0017] A first temperature sensor is disposed at the bottom of the first-stage heating tube, and a second temperature sensor is disposed at the top of the second-stage heating tube.

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

[0019] The first temperature sensor is located between the cooling water tower and the secondary heating pipe, and the second temperature sensor is located between the primary heating pipe and the float flowmeter.

[0020] In one embodiment, the two ends of the circulating water pump are respectively connected to the float flowmeter and the test liquid tank, forming circulating water consisting of the test liquid tank, the circulating water pump, the float flowmeter, the first-level heating pipe, the second-level heating pipe and the cooling water tower.

[0021] In one embodiment, one side of the control panel is provided with a conductivity detector, a pH meter, a circulating water tank temperature meter, an inlet water temperature meter, an outlet water temperature meter and a control knob.

[0022] In one embodiment, a porous filter material is arranged inside the cooling water tower, and the cooling water tower has a spray cooling function.

[0023] In one embodiment, the test liquid tank is connected to the automatic sampling mechanism and the automatic sewage discharge mechanism through pipelines, and the test liquid tank is connected to the automatic potentiometric titration mechanism through pipelines.

[0024] According to a second aspect of an embodiment 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] Monitor the liquid level values ​​inside the raw water tank and the test liquid tank in real time. When the extraction conditions are met, use the raw water pump to transport the raw water in the raw water tank to the test liquid tank.

[0027] Drive the circulating water pump to extract the test solution in the test solution tank, and in accordance with the direction of the circulating water, sequentially pass through the float flowmeter, the primary heating pipe and the secondary heating pipe to enter the cooling water tower, and monitor the real-time flow rate and inlet and outlet temperatures of the circulating water in real time;

[0028] Based on the inlet and outlet temperatures of the circulating water, the centrifugal fan is controlled to start running to cool the circulating water until the circulating water returns to the test solution tank;

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

[0030] Based on the conductivity monitored in real time by the conductivity detector, 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 through the host computer.

[0031] In one embodiment, the real-time monitoring of the liquid level values ​​inside the raw water tank and the test liquid tank, and when the extraction conditions are met, using the raw water pump to transport the raw water in the raw water tank to the test liquid tank includes:

[0032] The liquid level of the raw water is detected by using a liquid level sensor inside the raw water tank, and 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 test liquid level is detected by the liquid level sensor inside the test liquid tank. When the test liquid level is lower than the preset test liquid level threshold and the raw water level 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 liquid tank.

[0034] In one embodiment, the driving circulating water pump extracts the test solution in the test solution tank, and sequentially passes through the float flowmeter, the primary heating pipe and the secondary heating pipe into the cooling water tower according to the circulating water direction, and real-time monitoring of the real-time flow rate and inlet and outlet temperatures of the circulating water includes:

[0035] real-time monitoring of the test liquid level inside the test liquid tank; when the test liquid level is lower than a preset test liquid level threshold, calling the raw water pump to extract raw water to replenish the test liquid tank, and at the same time using the circulating water pump to extract the test liquid and start the circulation; when the test liquid level is higher than or equal to the preset test liquid level threshold, stopping the raw water pump from replenishing the liquid, and continuing to maintain the circulating water pump to extract and drive the test liquid for circulation to form circulating water;

[0036] The first temperature sensor is used to detect the inlet temperature of the circulating water. According to the set temperature value, the first and second heating tubes are controlled to start heating the circulating water. The second temperature sensor is used to detect the outlet temperature of the circulating water until it enters the cooling tower.

[0037] The float flowmeter is used to monitor the flow of circulating water in real time. When the flow 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, the controlling the centrifugal fan to start running 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 water temperature of the circulating water is obtained. If the outlet water 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 water temperature is less than the cooling temperature threshold, the centrifugal fan is stopped from being driven.

[0040] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: the present invention is applicable to the technical requirements of the design, manufacture, installation and commissioning of equipment related to the circulating water dynamic simulation test device, and undergoes two-stage heating-cooling-water quality detection-control operation conditions. The main process adopts water replenishment tank-circulating water tank-boosting pump-flow meter-primary heating-secondary heating-cooling tower-circulating water tank. The overall equipment realizes automatic operation and data is collected centrally. By integrating multiple sensors and automatic control systems, the automatic control of the circulating water dynamic simulation test process is realized, the efficiency and safety of the circulating water dynamic simulation test are improved, and the labor intensity and error rate of manual operation are reduced.

[0041] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a 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 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 A partial enlarged view of the middle part;

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

[0046] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

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

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

[0049] Figure 7 The present invention is a flow chart of a control method of an intelligent circulating water simulation test device according to an exemplary embodiment.

[0050] Reference numerals:

[0051] 1. Raw water tank; 2. Main frame; 3. Upper computer; 4. Automatic acid adding mechanism; 401. Acid adding box; 402. Acid adding metering pump; 5. Cooling tower; 6. Test solution tank; 7. Circulating water pump; 8. Heating mechanism; 801. Primary heating tube; 802. Secondary heating tube; 803. First temperature sensor; 804. Second temperature sensor; 9. Float flowmeter; 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 detector; 18. pH meter; 19. Circulating water tank temperature meter; 20. Inlet water temperature meter; 21. Outlet water temperature meter; 22. Control knob. DETAILED DESCRIPTION

[0052] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0053] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0054] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0055] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0056] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0057] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0058] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0059] Figure 1-Figure 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, and an automatic acid adding mechanism 4 is arranged on one side of the raw water tank 1; a cooling water tower 5, a test liquid tank 6 and a circulating water pump 7 are arranged inside the main frame 2, a heating mechanism 8, a float flowmeter 9 and a control panel 10 are arranged on the top of one side of the main frame 2, an automatic sampling mechanism 11 and an automatic sewage discharge mechanism 12 are arranged on the bottom of one side of the main frame 2, and an automatic titration mechanism 13 is arranged on one side of the host computer 3.

[0061] In this optional embodiment, the automatic acid adding mechanism 4 comprises an acid adding box 401 , an acid adding metering pump 402 is arranged on the top of the acid adding box 401 , and the acid adding metering pump 402 is connected to the raw water tank 1 via a pipeline.

[0062] In this optional embodiment, the cooling water tower 5 is located at one side of the top of the main frame 2 , an air outlet 14 is provided at the top of the cooling water tower 5 , and 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 position inside the main frame 2 , the test liquid tank 6 is located directly below the cooling water tower 5 , and the test liquid tank 6 is connected to the cooling water tower 5 by a pipeline.

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

[0065] Specifically, the raw water tank 1 is about 300L, made of PE material, non-toxic and odorless food grade standard. A low liquid level sensor is set in the raw water tank. When the liquid level is low and the liquid level is exceeded, the equipment alarms and the raw water pump stops working. When the liquid level is higher than the low liquid level, the raw water pump starts. The liquid level linkage realizes the automatic operation of the raw water pump, and at the same time safely protects the water pump and prevents the water pump from being damaged due to emptying. The water tank is equipped with an automatic drain valve to realize automatic drainage. At the same time, a manual drain valve is configured to realize manual emergency drainage and ensure that the liquid inside the water tank is drained as much as possible.

[0066] In this optional embodiment, liquid level sensors are provided inside the raw water tank 1 and the test liquid tank 6 . 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 tank 6 is about 60L and is made of acrylic material. It is used to store and adjust the test water and realize the circulating water concentration function. The raw water pump 16 lifts the liquid in the raw water tank 1 into the test tank 6 by pressure, and the test tank 6 automatically replenishes water and is linked to the liquid level. When the test tank 6 is at a high liquid level, the circulating pump starts, and when the test tank 6 is lower than the low liquid level, the circulating pump stops. When the test tank 6 is at a low liquid level, the raw water pump starts to automatically replenish water, and the automatic replenishment ends when the liquid level in the test tank 6 reaches the high liquid level. Conductivity probes, pH probes, temperature probes, and liquid level probes are set in the test tank 6 to monitor the conductivity, pH, temperature, and liquid level of the circulating water in the test tank 6. The probe should avoid contact with the test tank. The sensor is transmitted to the secondary heads such as the conductivity meter, pH meter, and temperature display, and is linked to the acid addition and dosing systems through the host computer to realize functions such as automatic excessive discharge and automatic adjustment of water quality. A manual drain ball valve and a drain pipe are arranged at the bottom of the test liquid tank 6. When the liquid in the test liquid tank needs to be drained, the manual drain ball valve is opened manually to realize the drain function.

[0068] When the conductivity is higher than the set upper limit, the sewage discharge valve is started; when it is lower than the lower limit, the sewage discharge is stopped. Within the set sewage discharge range, the discharge setting time is equal to the weight, and the interval is the set time, and the discharge is scheduled.

[0069] In this optional embodiment, the heating mechanism 8 includes a first-level heating tube 801 and a second-level heating tube 802 arranged at the top of one side of the main frame 2, the first-level heating tube 801 and the second-level heating tube 802 are parallel to each other, and the first-level heating tube 801 is close to the float flowmeter 9; a first temperature sensor 803 is arranged at the bottom of the first-level heating tube 801, and a second temperature sensor 804 is arranged at the top of the second-level heating tube 802.

[0070] In this optional embodiment, the cooling water 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 flowmeter 9 by a pipe; the first temperature sensor 803 is located between the cooling water 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 flowmeter 9.

[0071] In this optional embodiment, the two ends of the circulating water pump 7 are respectively connected to the float flowmeter 9 and the test liquid tank 6, forming circulating water consisting of the test liquid tank 6, the circulating water pump 7, the float flowmeter 9, the first-level heating pipe 801, the second-level heating pipe 802 and the cooling water tower 5.

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

[0073] In this optional embodiment, a porous filter material is arranged inside the cooling water tower 5, and the cooling water tower 5 has a spray cooling function.

[0074] In this optional embodiment, the test liquid tank 6 is connected to the automatic sampling mechanism 11 and the automatic sewage discharge mechanism 12 through pipelines, and the test liquid tank 6 is connected to the automatic potentiometric titration mechanism 13 through pipelines.

[0075] Figure 7 An embodiment of a 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, real-time monitoring of the liquid level values ​​inside the raw water tank 1 and the test liquid tank 6, when the extraction conditions are met, using 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, driving the circulating water pump 7 to extract the test solution in the test solution tank 6, and the test solution passes through the float flowmeter 9, the primary heating pipe 801 and the secondary heating pipe 802 in sequence according to the circulating water direction to enter the cooling water tower 5, and the real-time flow rate and inlet and outlet temperatures of the circulating water are monitored in real time;

[0079] Step S105, based on the inlet and outlet temperatures of the circulating water, controlling the centrifugal fan 15 to start running, cooling the circulating water, until the circulating water returns to the test solution tank 6;

[0080] Step S107, setting the automatic sampling time, regularly scheduling the automatic sampling mechanism 11 to perform automatic sampling, using the automatic titration mechanism 13 to titrate the taken water sample, and setting and based on the preset automatic acid addition parameters, according to the pH value change of the water sample, when the acid addition conditions are met, controlling the automatic acid addition mechanism 4 to adjust the water quality;

[0081] Step S109 , based on the conductivity monitored in real time by the conductivity detector 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 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, when the extraction conditions are met, using the raw water pump 16 to transport the raw water in the raw water tank 1 to the test liquid tank 6 includes: using the 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 the liquid level sensor inside the test liquid tank 6 to detect the test liquid level, when the test liquid level is lower than the preset test liquid level threshold, and the raw water level is higher than the preset raw water level threshold, controlling the raw water pump 16 to start working, and transporting 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 extracts the test solution in the test solution tank 6, and in accordance with the circulating water direction, sequentially passes through the float flowmeter 9, the primary heating tube 801 and the secondary heating tube 802 to enter the cooling tower 5, and real-time monitoring of the real-time flow rate and the inlet and outlet temperatures of the circulating water 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, calling the raw water pump 16 to extract raw water to achieve liquid replenishment in the test solution tank 6, and at the same time using the circulating water pump 7 to extract the test solution, start the circulation, and when the test solution level is higher than or equal to the preset test solution level threshold, the raw water pump 16 is called to extract raw water to achieve liquid replenishment in the test solution tank 6, and at the same time, the circulating water pump 7 is used to extract the test solution, and the circulation is started, and when the test solution level is higher than or equal to the preset test solution level threshold, the raw water pump 16 is called to extract raw water to achieve liquid replenishment in the test solution tank 6 ... When the threshold is reached, the replenishment of the raw water pump 16 is stopped, and the circulating water pump 7 is continued to extract and drive the test fluid for circulation to form circulating water; the first temperature sensor 803 is used to detect the inlet temperature of the circulating water, and according to the set temperature value, the first-level heating tube 801 and the second-level heating tube 802 are controlled to start heating the circulating water, and the second temperature sensor 804 is used to detect the outlet temperature of the circulating water until it enters the cooling tower 5; the float flowmeter 9 is used to monitor the flow of the circulating water in real time. When the flow of the circulating water is lower than the preset threshold, the water cut-off protection function is started, the heating is stopped, and the alarm is triggered.

[0084] In this optional embodiment, the centrifugal fan 15 is controlled to start running 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 6, including: obtaining the outlet water temperature of the circulating water, if the outlet water 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 water temperature is less than the cooling temperature threshold, stopping driving the centrifugal fan 15.

[0085] The intelligent circulating water simulation test device and its control method are described in detail below in conjunction with 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: comprises two sets of heating pipes connected in series, and is used for heating circulating water.

[0088] Water cut-off protection unit (not shown in the figure): used to automatically stop heating when the heating system lacks water to prevent equipment damage.

[0089] Temperature sensors (including the first temperature sensor 803 and the 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] Valve (not shown in the figure): used to control the flow rate of system circulating water.

[0093] The test device realizes the circulation of test water through the circulating water pump 7, and the circulating water pump 7 pumps the water in the test solution tank 6 into the cooling water tower 5. The water sample is heated before entering the cooling water tower 5. Two sets of water sample heating units are set up, which can be connected in series or in parallel by switching circuits, so that any one of them can be cut off to achieve power and efficiency diversification. A flow meter is set on the water path, and the two-stage heating system realizes manual power adjustment, which is adjusted according to actual demand.

[0094] Considering safety, a water cut-off protection unit must be set. When there is a water shortage in the heating system, a non-contact liquid level meter is used for protection and heating is automatically stopped to prevent the heating unit from being burned. In addition, the inlet and outlet temperature sensors are used to set the heating unit to be automatically cut off when the temperature is too high (over 65°C). The cooling tower 5 is filled with porous filter material to increase the contact surface area with the circulating water, improve the heat dissipation efficiency, and ensure that the circulating water is evenly distributed to achieve the water sample spray cooling function. A centrifugal fan 15 is set at the upper end of the cooling tower 5 to control the temperature of the circulating water using a temperature sensor. When the temperature is higher than the set temperature, the fan is started, and when it is lower than the set temperature, the centrifugal fan 15 is stopped.

[0095] Automatic sampling mechanism 11: used for regular automatic sampling. Sampling is achieved every 6-8 hours. The time relay is linked with the solenoid valve. When the set time is reached, the solenoid valve is automatically opened to sample 200L of liquid. And with the automatic sampling rotating disk, it can automatically rotate to the next blank water sample bottle after sampling. The obtained sample can be used for manual titration or for sample verification test. 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 plate located below the sampling tube, such as Figure 5 As shown, the sampling tube can add the water sample directly to the sampling plate.

[0096] Automatic acid adding mechanism 4: The test device is linked with the automatic acid adding mechanism 4 through the pH meter 18 or the alkalinity meter, and the linkage with which instrument and which indicator can be set by yourself. Upload the 4-20MA signal to the upper computer, and realize automatic acid addition and automatic adjustment of water quality through proportional calculation according to the actual required pH or alkalinity value to ensure the accuracy of the dosage. When the acid addition is controlled by pH, the speed of sulfuric acid addition needs to be controlled. It is recommended that the acid addition speed should not be higher than 1ml / min, and the acid addition effect should be judged after an interval of more than 10 minutes after the addition of sulfuric acid to ensure sufficient reaction and accurate test results. Add a control program, reach the dosing range, set the dosing time, and stop time. The acid addition speed and dosing pump can be adjusted manually.

[0097] When acid addition is controlled by alkalinity, it is calculated as follows:

[0098] According to experience, power plants generally control alkalinity (JD) to 6mmol / L or less, that is, JD≤6.0mmol / L, and the concentration of concentrated sulfuric acid is 18.4mol / L. If the raw water alkalinity is 4.20mmol / L and the target concentration ratio is 5.0, then acid should be added to adjust the alkalinity to 1.20mmol / L before concentration. When adding 1 barrel of 25L raw water, according to the JD and sulfuric acid equivalent ratio, the volume of sulfuric acid to be added is (4.20-1.20)*25 / 18.4 / 2=2.0ml.

[0099] Automatic sewage discharge mechanism 12: The test device automatically discharges sewage through the conductivity meter value or the concentration ratio value, and the linkage with which indicator can be set by yourself. Upload to the host computer through 4-20MA signal. According to the actual setting value, the automatic excessive sewage discharge function is realized by controlling the opening / closing of the electromagnetic and other actions. At the same time, the double-layer protection of the manual discharge function needs to be met.

[0100] The automatic monitoring system draws out 200mL of circulating water from the test solution tank 6 and enters the automatic monitoring system for automatic monitoring of key indicators of the circulating water test, including automatic potentiometric titration to monitor alkalinity, chloride ion concentration, calcium hardness, magnesium hardness, and total hardness, automatically calculates the concentration ratio based on the chloride ion concentration or conductivity value, and sets automatic sewage discharge when the concentration ratio exceeds the preset value. The time can be set to regularly calculate the chloride ion concentration concentration ratio and the calcium ion concentration concentration ratio, and calculate the difference ΔB between the chloride ion concentration concentration ratio and the calcium ion concentration concentration ratio. When ΔB ≥ 0.2, it is the limit carbonate hardness of the test, and the chloride ion concentration ratio under this condition is the maximum concentration ratio of the test. The monitoring data is uploaded to the monitoring system software at the same time.

[0101] Circulating water scale inhibitor and corrosion inhibitor concentration monitoring device (not shown in the figure). The circulating fluorescent agent concentration is detected by fluorescence method, and then the circulating water scale inhibitor and corrosion inhibitor concentration is calculated by the concentration relationship between the scale inhibitor and the fluorescent agent, and the amount of circulating water scale inhibitor and corrosion inhibitor added is adjusted to ensure the concentration of scale inhibitor and corrosion inhibitor in the circulating water system. At the same time, the monitoring system software is uploaded. The scale inhibitor and corrosion inhibitor concentration can be obtained based on the concentration of the fluorescent agent in the scale inhibitor and corrosion inhibitor. For example, for a 1:500 type fluorescent agent, that is, 1 kg of fluorescent agent is added to 500 kg of scale inhibitor and corrosion inhibitor, and the fluorescent agent concentration is detected to be 0.01 mg / L, then the scale inhibitor and corrosion inhibitor concentration is 5 mg / L.

[0102] Host computer 3: The test device is set up to display the inlet and outlet temperatures of the heating unit through the host computer 3, and the inlet and outlet temperature difference is controlled at 3 to 8°C through the PLC. A temperature sensor is set in the water tank, and the sensor is linked to the fan through a 4-20MA signal. The liquid level sensor is linked to the drain valve through the liquid 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 is linked with the acid addition, drug addition, and sewage discharge systems to achieve functions such as automatic excessive discharge and automatic adjustment of water quality. Its temperature sensor is also set in the PLC, and the three temperature sensors, conductivity meters, and pH meters are remotely displayed. Through the host computer, not only can the test data be outlined, but also the automatic real-time curve trend is available, and the real-time data curve and the historical curve can be automatically saved and viewed at any time.

[0103] In addition, the process of the control method of the intelligent circulating water simulation test device may include the following aspects:

[0104] 1. The low liquid level sensor of the 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 water pump from being emptied.

[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, and when the liquid level is higher than the set low liquid level, the circulating water pump 7 starts to realize the water circulation operation mode.

[0107] 4. The heating mechanism 8 automatically adjusts the heating power according to the feedback of the temperature sensor, and the water cut protection unit automatically stops heating when there is a lack of water. The first-stage heating and second-stage heating control the opening of the heating rod through the sensor, and then calculate the power setting value in the PLC according to the set temperature and the alarm temperature through time, and the heating tube temperature controls the real-time temperature to realize the temperature automatic heating function. The first-stage heating and second-stage heating are linked to the PLC through the liquid level sensor to realize the heating function water shortage alarm and automatic power off and stop heating according to the set liquid level height.

[0108] 5. The centrifugal fan 15 automatically starts and stops according to the temperature of the circulating water to achieve temperature control. The centrifugal fan 15 is controlled by linking the temperature sensor in the test liquid tank to the PLC, and the temperature over-temperature alarm is set according to the temperature upper and lower limits, and the fan is started to cool down according to the cycle.

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

[0110] 7. The automatic acid adding mechanism 4 automatically adjusts the amount of acid added according to the reading of the pH meter. The test device is linked with the automatic acid adding device through the automatic pH meter, and the 4-20MA signal is uploaded to the host computer to automatically adjust the water quality according to the actual required pH value to ensure the accuracy of the added amount.

[0111] 8. The automatic sewage discharge mechanism 12 automatically discharges sewage according to the reading of the conductivity meter. The automatic sewage discharge solenoid valve is linked with the PLC for timing through conductivity, for example, 2000μS / 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 the alkalinity, chloride ion concentration, calcium hardness and hardness.

[0113] 10. The host computer 3 uses PLC programming to display and control the entire system in real time, including monitoring of temperature, conductivity and pH value, recording and uploading titration data, alarm information and historical records.

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

[0115] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An intelligent circulating water simulation test device, characterized in that: It comprises a raw water tank (1), a main frame (2) and a host computer (3), wherein one side of the raw water tank (1) is provided with an automatic acid adding mechanism (4); A cooling tower (5), a test solution tank (6) and a circulating water pump (7) are arranged inside the main frame (2); a heating mechanism (8), a float flowmeter (9) and a control panel (10) are arranged on the top of one side of the main frame (2); an automatic sampling mechanism (11) and an automatic sewage discharge mechanism (12) are arranged on the bottom of one side of the main frame (2); and an automatic titration mechanism (13) is arranged on one side of the host computer (3).

2. The intelligent circulating water simulation test device according to claim 1 is characterized in that: The automatic acid adding mechanism (4) comprises an acid adding box (401), the top of which is provided with an acid adding metering pump (402), and the acid adding metering pump (402) is connected to the raw water tank (1) via a pipeline.

3. The intelligent circulating water simulation test device according to claim 1 is characterized in that: The cooling water tower (5) is located on one side of the top of the main frame (2). An air outlet (14) is provided at the top of the cooling water tower (5), and a centrifugal fan (15) is provided inside the air outlet (14).

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

5. The intelligent circulating water simulation test device according to claim 4 is characterized in that: The test liquid tank (6) is connected to the raw water tank (1) via a pipeline, and a raw water pump (16) is provided between the test liquid tank (6) and the raw water tank (1).

6. The intelligent circulating water simulation test device according to claim 5 is characterized in that: Liquid level sensors are provided inside the raw water tank (1) and the test liquid tank (6); the raw water tank (1) is made of PE material, and the test liquid tank (6) is made of acrylic material.

7. The intelligent circulating water simulation test device according to claim 1 is characterized in that: The heating mechanism (8) comprises a primary heating tube (801) and a secondary heating tube (802) arranged at 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 disposed at the bottom of the first-stage heating tube (801), and a second temperature sensor (804) is disposed at the top of the second-stage heating tube (802).

8. The intelligent circulating water simulation test device according to claim 7 is characterized in that: The cooling water 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 flowmeter (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 flowmeter (9).

9. The intelligent circulating water simulation test device according to claim 8, characterized in that: The two ends of the circulating water pump (7) are respectively connected to the float flowmeter (9) and the test liquid tank (6), forming circulating water consisting of the test liquid tank (6), the circulating water pump (7), the float flowmeter (9), the first-level heating pipe (801), the second-level heating pipe (802) and the cooling water tower (5).

10. The intelligent circulating water simulation test device according to claim 1, characterized in that: One side of the control panel (10) is provided with a conductivity detector (17), a pH meter (18), a circulating water tank temperature meter (19), an inlet water temperature meter (20), an outlet water temperature meter (21) and a control knob (22).

11. The intelligent circulating water simulation test device according to claim 9, characterized in that: The cooling water tower (5) is provided with porous filter material inside, and the cooling water tower (5) has a spray cooling function.

12. 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) via pipelines, and the test liquid tank (6) is connected to the automatic potentiometric titration mechanism (13) via pipelines.

13. A control method for an intelligent circulating water simulation test device, characterized in that: include: Real-time monitoring of the liquid level values ​​inside the raw water tank (1) and the test liquid tank (6), and when the extraction conditions are met, using the raw water pump (16) to transport the raw water in the raw water tank (1) to the test liquid tank (6); The circulating water pump (7) is driven to extract the test solution in the test solution tank (6), and the test solution enters the cooling tower (5) through the float flow meter (9), the first-level heating pipe (801) and the second-level heating pipe (802) in the direction of the circulating water, and the real-time flow rate and inlet and outlet temperatures of the circulating water are monitored in real time; Based on the inlet and outlet temperatures of the circulating water, the centrifugal fan (15) is controlled to start running to cool the circulating water until the circulating water returns to the test solution tank (6); The automatic sampling time is set, the automatic sampling mechanism (11) is regularly scheduled to perform automatic sampling, the water sample is titrated by the automatic titration mechanism (13), and based on the preset automatic acid addition parameters, according to the pH value change of the water sample, when the acid addition conditions are met, the automatic acid addition mechanism (4) is controlled to adjust the water quality; Based on the conductivity monitored in real time by the conductivity detector (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 through the host computer (3).

14. The control method of the intelligent circulating water simulation test device according to claim 13, 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 when the extraction conditions are met, using the raw water pump (16) to transport the raw water in the raw water tank (1) to the test liquid tank (6) comprises: 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; The liquid level of the test liquid is detected by using a liquid level sensor inside the test liquid tank (6); when the liquid level of the test liquid is lower than a preset test liquid level threshold and the liquid level of the raw water is higher than the preset raw water level threshold, the raw water pump (16) is controlled to start working and the raw water in the raw water tank (1) is transported to the test liquid tank (6).

15. The control method of the intelligent circulating water simulation test device according to claim 13, characterized in that: The driving circulating water pump (7) extracts the test solution in the test solution tank (6), and in accordance with the direction of the circulating water, sequentially passes through the float flowmeter (9), the first-level heating pipe (801) and the second-level heating pipe (802) into the cooling tower (5), and real-time monitoring of the real-time flow rate and inlet and outlet temperatures of the circulating water includes: The test liquid level in the test liquid tank (6) is monitored in real time. When the test liquid level is lower than a preset test liquid level threshold, the raw water pump (16) is called to extract raw water to replenish the test liquid tank (6). At the same time, the circulating water pump (7) is used to extract the test liquid and start the circulation. When the test liquid level is higher than or equal to the preset test liquid level threshold, the raw water pump (16) is stopped to replenish the liquid, and the circulating water pump (7) is continued to extract and drive the test liquid to circulate, thereby forming circulating water; The first temperature sensor (803) is used to detect the inlet temperature of the circulating water, and according to the set temperature value, the first-level heating pipe (801) and the second-level heating pipe (802) are controlled to start heating the circulating water, and the second temperature sensor (804) is used to detect the outlet temperature of the circulating water until the circulating water enters the cooling tower (5); The flow rate of the circulating water is monitored in real time by using a float flow meter (9). When the flow rate of the circulating water is lower than a preset threshold, a water cut-off protection function is activated, heating is stopped, and an alarm is triggered.

16. The control method of the intelligent circulating water simulation test device according to claim 13, characterized in that: The method of controlling the centrifugal fan (15) to start running 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 (6) comprises: The outlet water temperature of the circulating water is obtained. If the outlet water 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 water temperature is less than the cooling temperature threshold, the centrifugal fan (15) is stopped from being driven.

Images