A simple experimental apparatus and method for testing scale inhibition performance.

Abstract

This invention discloses a simple experimental apparatus and method for testing scale inhibition performance, comprising a water tank, a flow meter, a water pump, an electromagnetic scale inhibitor, a ball valve, and a temperature controller. The outlet of the water tank is connected to the inlet of the water pump via the flow meter, and the outlet of the water pump is connected to the inlet of the electromagnetic scale inhibitor. The outlet of the electromagnetic scale inhibitor is connected to the inlet of the water tank via the ball valve. A heating rod and a temperature sensor are installed inside the water tank. The temperature controller is connected to the control end of the heating rod, and the output end of the temperature sensor is connected to the temperature controller. The water tank contains an experimental solution. This apparatus and method can realize static testing of the scale inhibition performance of scale inhibitors and dynamic testing of the electromagnetic scale inhibition performance.

Description

Technical Field

[0001] This invention belongs to the field of scale inhibition technology and relates to a simple experimental apparatus and method for testing scale inhibition performance. Background Technology

[0002] In modern industrial structures, the use of heat exchangers often leads to blockages in circulating cooling water pipes. This not only increases heat transfer losses and reduces energy efficiency but also shortens pipe lifespan. Therefore, research on scale inhibition technology for heat exchanger pipes has become an urgent priority for industrial development. In scale inhibition research on pipes and heat exchangers, chemical scale inhibition technology is widely used, primarily employing the addition of chemical scale inhibitors. Since the 19th century, various physical scale inhibition technologies have emerged, with electromagnetic scale inhibition technology becoming a commonly used physical scale inhibition technology due to its low energy consumption and significant scale inhibition effect.

[0003] The shortcomings and deficiencies of existing technologies: In the process of scale inhibition performance testing, the static and dynamic combined testing device for the scale inhibition performance of scale inhibitors and electromagnetic scale inhibition performance is still in the research blank, and there is no scientific and reasonable device for testing scale inhibition performance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple experimental device and method for testing scale inhibition performance. This device and method can realize static testing of scale inhibition performance and dynamic testing of electromagnetic scale inhibition performance.

[0005] To achieve the above objectives, this invention discloses a simple experimental apparatus for testing scale inhibition performance, including a water tank, a flow meter, a water pump, a solar panel, an electromagnetic scale inhibitor, a ball valve, a water tank, and a temperature controller.

[0006] The outlet of the water tank is connected to the inlet of the water pump via a flow meter, the outlet of the water pump is connected to the inlet of the electromagnetic scale inhibitor, and the outlet of the electromagnetic scale inhibitor is connected to the inlet of the water tank via a ball valve.

[0007] The water tank is equipped with a heating rod and a temperature sensor. A temperature controller is connected to the control end of the heating rod, and the output end of the temperature sensor is connected to the temperature controller. The water tank contains an experimental solution.

[0008] The outlet of the water tank is connected to the inlet of the water pump via a galvanized pipe, and the flow meter is installed on the galvanized pipe.

[0009] The electromagnetic scale inhibitor includes a test chamber, a signal generator, and an electromagnetic coil wound around the outer wall of the test chamber. The electromagnetic coil and the signal generator form a series circuit, and the test chamber is connected to a water pump and a ball valve.

[0010] During the experiment, the electromagnetic scale inhibitor was powered by a solar panel.

[0011] A magnetic field is applied to the experimental solution inside the test chamber using an electromagnetic coil.

[0012] The strength of the magnetic field is adjusted by the number of turns of the electromagnetic coil.

[0013] The experimental solution was industrial circulating cooling water.

[0014] During the experiment, the flow rate of the experimental solution passing through the electromagnetic scale inhibitor was controlled by a ball valve and a water pump.

[0015] The flow meter is a turbine flow meter.

[0016] This invention discloses a simple experimental method for testing scale inhibition performance, comprising the following steps:

[0017] Dynamic testing of electromagnetic scale inhibition performance:

[0018] Start-up phase: 1) The thermostat controls the heating rod to heat the experimental solution in the water tank until the temperature measured by the temperature sensor reaches the preset test temperature; 2) Start the solar panel and inverter module; 3) Start the water pump and open the ball valve to draw the experimental solution from the water tank, and then return it to the water tank through the electromagnetic scale inhibitor and the ball valve. Adjust the opening of the ball valve and the power of the water pump so that the flow meter detects the flow rate to the preset test flow rate; 4) Start the electromagnetic scale inhibitor and test its scale inhibition performance.

[0019] Testing phase: After the electromagnetic scale inhibitor system is started and running stably, the scale growth curve is obtained by sampling and testing the conductivity and calcium ion concentration at 20-minute intervals. The scale inhibition performance of the electromagnetic scale inhibitor is obtained by measuring the increase of the growth curve.

[0020] Shutdown phase: Turn off the heating rod; turn off the electromagnetic scale inhibitor; turn off the solar panel and inverter module; turn off the water pump; after the water in the tank cools down to room temperature, take samples from the water in the tank; turn off the temperature sensor and stop temperature monitoring; turn off all power.

[0021] Water sample analysis stage: The performance of the scale inhibitor in inhibiting calcium sulfate scale was analyzed according to the "Performance Evaluation Method of Scale Inhibitors for Oilfield Use" (SY / T5673-1993).

[0022] After the reaction reaches equilibrium, and the water in the tank cools to room temperature, a 5 mL water sample is filtered through a membrane and the free Ca in the solution is titrated with EDTA. 2+ Ca in the solution 2+ A higher concentration indicates better performance of the scale inhibitor in preventing calcium sulfate scale buildup. The specific testing method is as follows.

[0023] (1) Preparation of solutions and reagents

[0024] a. EDTA standard solution: c(EDTA) = 0.1 mol / L: Weigh 20 g of disodium ethylenediaminetetraacetate, dissolve it in water, and make up to 500 mL; c(EDTA) = 0.01 mol / L: Weigh 4 g of disodium ethylenediaminetetraacetate, dissolve it in water, and make up to 1000 mL.

[0025] b. Potassium hydroxide solution: c = 200 g / L Weigh 100 g of potassium hydroxide, dissolve it in water, and dilute to 500 mL.

[0026] c. Calcium carboxylic acid indicator: Weigh 0.2g of calcium carboxylic acid indicator and mix it with 100g of KCl powder until homogeneous. Place the mixture in a bottle and store it in a dry place for later use.

[0027] Use a pipette to transfer 2 mL of calcium chloride standard solution and determine the Ca2+ using EDTA titration. 2+ Concentration, calculate Ca in standard solution 2 + Content (expressed as mass concentration), in mg / mL, is calculated using the following formula:

[0028]

[0029] V1—The volume of EDTA standard solution consumed in the titration, in mL;

[0030] c—Concentration of the EDTA standard solution, unit: mol / L;

[0031] V—The volume of calcium chloride standard solution transferred, in mL;

[0032] M—Molar mass of calcium ions, unit: g / mol (M is taken as 40.08).

[0033] (2) Calcium ion concentration determination

[0034] The method for determining calcium ion concentration is in accordance with GB / T7476-1987 "Determination of Calcium in Water - EDTA Titration Method". According to the standard requirements, when titrating with EDTA solution, the calcium ion concentration should be diluted to 2–100 mg / L.

[0035] 1. Take 25 mL of filtrate into an Erlenmeyer flask and add distilled water to bring the volume to 80 mL.

[0036] 2. Add 5 mL of 200 g / L potassium hydroxide.

[0037] 3. Add a small amount of calcium reagent, titrate with EDTA until a light blue solution appears, and record the volume V1.

[0038] 4. Calculation of calcium ions:

[0039] The calcium ion concentration (C), expressed in mg / L, is calculated using the following formula:

[0040]

[0041] In the formula: V1 represents the volume of disodium ethylenediaminetetraacetate standard titration solution consumed in the titration, in mL;

[0042] C represents the actual concentration of the disodium ethylenediaminetetraacetate standard titration solution, in mmol / L;

[0043] V represents the volume of the calcium chloride standard solution taken, in mL;

[0044] 0.04008 represents the mass of calcium ions in grams equivalent to 1.00 mL of 1 M disodium ethylenediaminetetraacetate standard solution.

[0045] Static test of scale inhibition performance of scale inhibitor: Start-up phase: 1) Start the heating rod and temperature sensor. The heating rod heats the test solution in the water tank to the preset test temperature; 2) Add scale inhibitor to the water tank;

[0046] Stopping phase: Turn off the heating rod; after the water temperature in the tank drops to room temperature, take samples of the experimental solution in the tank; turn off the temperature sensor; turn off all power.

[0047] Scale inhibition performance evaluation stage:

[0048] After the reaction reaches equilibrium, and the water in the tank cools to room temperature, a 5 mL water sample is filtered through a membrane and the free Ca in the solution is titrated with EDTA. 2+ Ca in the solution 2+ A higher concentration indicates better performance of the scale inhibitor in preventing calcium sulfate scale buildup. The specific testing method is as follows.

[0049] (1) Preparation of solutions and reagents

[0050] a. EDTA standard solution: c(EDTA) = 0.1 mol / L: Weigh 20 g of disodium ethylenediaminetetraacetate, dissolve it in water, and make up to 500 mL; c(EDTA) = 0.01 mol / L: Weigh 4 g of disodium ethylenediaminetetraacetate, dissolve it in water, and make up to 1000 mL.

[0051] b. Potassium hydroxide solution: c = 200 g / L Weigh 100 g of potassium hydroxide, dissolve it in water, and dilute to 500 mL.

[0052] c. Calcium carboxylic acid indicator: Weigh 0.2g of calcium carboxylic acid indicator and mix it with 100g of KCl powder until homogeneous. Place the mixture in a bottle and store it in a dry place for later use.

[0053] Use a pipette to transfer 2 mL of calcium chloride standard solution and determine the Ca2+ using EDTA titration.2+ Concentration, calculate Ca in standard solution 2 + Content (expressed as mass concentration), in mg / mL, is calculated using the following formula:

[0054]

[0055] V1—The volume of EDTA standard solution consumed in the titration, in mL;

[0056] c—Concentration of the EDTA standard solution, unit: mol / L;

[0057] V—The volume of calcium chloride standard solution transferred, in mL;

[0058] M—Molar mass of calcium ions, unit: g / mol (M is taken as 40.08).

[0059] (2) Calcium ion concentration determination

[0060] The method for determining calcium ion concentration is in accordance with GB / T7476-1987 "Determination of Calcium in Water - EDTA Titration Method". According to the standard requirements, when titrating with EDTA solution, the calcium ion concentration should be diluted to 2–100 mg / L.

[0061] 1. Take 25 mL of filtrate into an Erlenmeyer flask and add distilled water to bring the volume to 80 mL.

[0062] 2. Add 5 mL of 200 g / L potassium hydroxide.

[0063] 3. Add a small amount of calcium reagent, titrate with EDTA until a light blue solution appears, and record the volume V1.

[0064] 4. Calculation of calcium ions:

[0065] The calcium ion concentration (C), expressed in mg / L, is calculated using the following formula:

[0066]

[0067] In the formula: V1 represents the volume of disodium ethylenediaminetetraacetate standard titration solution consumed in the titration, in mL;

[0068] C represents the actual concentration of the disodium ethylenediaminetetraacetate standard titration solution, in mmol / L;

[0069] V represents the volume of the calcium chloride standard solution taken, in mL;

[0070] 0.04008 represents the mass of calcium ions in grams equivalent to 1.00 mL of 1 M disodium ethylenediaminetetraacetate standard solution.

[0071] After the static water sample test was completed, the solution was filtered, and the scale was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to obtain the morphological characteristics and crystal form of the scale.

[0072] The present invention has the following beneficial effects:

[0073] The simplified experimental apparatus and method for testing scale inhibition performance described in this invention, in specific operation, connects the outlet of a water tank to the inlet via a flow meter, a water pump, an electromagnetic scale inhibitor, and a ball valve. Simultaneously, a heating rod and a temperature sensor are installed inside the water tank. The flow rate of the experimental solution is adjusted by the flow meter, water pump, and ball valve, and the temperature of the experimental solution is adjusted by the heating rod and temperature sensor. Furthermore, a solar panel supplies power to the electromagnetic scale inhibitor via an inverter module. This invention also connects the electromagnetic scale inhibitor in series to the circulating water loop to meet the needs of static testing of scale inhibitor performance and dynamic testing of electromagnetic scale inhibition performance. The design is reasonable, the structure is simple, and it is environmentally friendly, effectively testing scale inhibition performance. The experimental apparatus described in this invention is technically and operationally similar to a real system. Through the study of scale inhibition performance, the influence of parameters such as flow rate, temperature, and magnetic field strength is obtained. These influence patterns of scale inhibition performance can provide experimental guidance for the design and research of scale inhibition technology. Attached Figure Description

[0074] Figure 1 This is a structural diagram of the present invention.

[0075] Among them, 1 is a flow meter, 2 is a galvanized pipe, 3 is a water pump, 4 is an electromagnetic scale inhibitor, 5 is a ball valve, 6 is a water tank, 7 is an experimental solution, 8 is a temperature controller, 9 is a heating rod, 10 is a temperature sensor, 11 is a solar panel, and 12 is an inverter module. Detailed Implementation

[0076] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0077] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0078] Example 1

[0079] refer to Figure 1 The simple experimental device for testing scale inhibition performance described in this invention includes a flow meter 1, a galvanized pipe 2, a water pump 3, an electromagnetic scale inhibitor 4, a ball valve 5, a water tank 6, an experimental solution 7, a temperature controller 8, a heating rod 9, a temperature sensor 10, a solar panel 11, and an inverter module 12.

[0080] The outlet of water tank 6 is connected to the inlet of water pump 3 via galvanized pipe 2. The outlet of water pump 3 is connected to the inlet of electromagnetic scale inhibitor 4. The electromagnetic scale inhibitor is powered by AC by solar panel 11 and inverter module 12. The outlet of electromagnetic scale inhibitor 4 is connected to the inlet of water tank 6 via ball valve 5. A flow meter 1 is installed on the galvanized pipe 2. Preferably, the flow meter 1 is a turbine flow meter. During operation, the water in water tank 6 returns to water tank 6 sequentially through galvanized pipe 2, water pump 3, electromagnetic scale inhibitor 4 and ball valve 5. During this process, the flow rate of experimental solution 7 at the outlet of water tank 6 is detected by flow meter 1.

[0081] The water tank 6 is equipped with a heating rod 9 and a temperature sensor 10. A temperature controller 8 is connected to the control terminal of the heating rod 9, and the output terminal of the temperature sensor 10 is connected to the temperature controller 8. The water tank 6 contains an experimental solution 7. During operation, the temperature controller 8 detects the temperature of the experimental solution 7 in the water tank 6 through the temperature sensor 10, compares the detected temperature of the experimental solution 7 in the water tank 6 with the preset experimental temperature, and controls the heating rod 9 according to the comparison result so that the temperature of the experimental solution 7 in the water tank 6 detected by the temperature sensor 10 is the preset experimental temperature.

[0082] In this embodiment, the galvanized pipe 2 has dimensions of Φ25.4mm × 8.3mm.

[0083] In this embodiment, during operation, the flow rate of the electromagnetic scale inhibitor 4 is controlled by the ball valve 5 and the water pump 3.

[0084] In this embodiment, the electromagnetic scale inhibitor 4 includes a test chamber, a signal generator, and an electromagnetic coil wound around the outer wall of the test chamber. The electromagnetic coil and the signal generator form a series circuit. During the test, a magnetic field is applied to the experimental solution 7 inside the test chamber via the electromagnetic coil. The magnetic field strength is adjusted by the number of turns of the electromagnetic coil. During the test, the test temperature does not exceed 80°C, the test pressure is 2.5 MPa, and the Cl in the experimental solution 7... - The concentration was 25000 mg / L, SO4 2- The concentration is 6000 mg / L, 1 / 2 Ca 2+ The concentration is 120 mmol / L, 1 / 2 Mg 2+ The concentration was 350 mmol / L, and the flow rate measured by flow meter 1 during the experiment was 0-500 L / h.

[0085] In this embodiment, the experimental solution 7 is industrial circulating cooling water.

[0086] Example 2

[0087] refer to Figure 1 The simplified experimental method for testing scale inhibition performance described in this embodiment is used for dynamic testing and includes:

[0088] Start-up: 1) Thermostat 8 controls heating rod 9 to heat experimental solution 7 in water tank 6 until the temperature measured by temperature sensor 10 is the preset test temperature; 2) Start water pump 3 and open ball valve 5 to draw water from water tank 6 through water pump 3, and then return it to water tank 6 through electromagnetic scale inhibitor 4 and ball valve 5. Adjust the opening of ball valve 5 and the power of water pump 3 so that the flow rate detected by flow meter 1 is the preset test flow rate; 3) Start solar panel 11 and inverter module 12; 4) Start electromagnetic scale inhibitor 4 to test the scale inhibition performance of electromagnetic scale inhibitor 4.

[0089] Stop: After the scale inhibition performance test of the electromagnetic scale inhibitor 4 is completed, turn off the heating rod 9; turn off the electromagnetic scale inhibitor 4; turn off the solar panel 11 and inverter module 12; turn off the water pump 3; after the water in the water tank 6 cools down to room temperature, take samples from the water in the water tank 6; turn off the temperature sensor 10 and stop temperature monitoring; turn off all power supplies.

[0090] Example 3

[0091] refer to Figure 1 The simplified experimental method for testing scale inhibition performance described in this embodiment is used for static testing and includes:

[0092] Start-up: 1) Start the heating rod 9 and the temperature sensor 10. The heating rod 9 heats the experimental solution 7 in the water tank 6 to the preset test temperature; 2) Add scale inhibitor to the water tank 6;

[0093] Stop: Turn off heating rod 9; after the water temperature in water tank 6 drops to room temperature, take the experimental solution 7 in water tank 6; turn off temperature sensor 10; turn off all power.

[0094] This invention fills the gap in testing both dynamic and static scale inhibition performance from an experimental perspective. The actual system of this invention is quite close to the actual system in terms of technology and operating conditions. Through the study of scale inhibition performance, the influence of parameters such as flow rate, temperature and magnetic field strength is obtained. The influence of these parameters on scale inhibition performance can provide experimental guidance for the design and research of scale inhibition technology.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A simple experimental apparatus for testing scale inhibition performance, characterized by, The water tank (6), the flow meter (1), the water pump (3), the electromagnetic scale inhibitor (4), the ball valve (5) and the temperature controller (8) are included. The outlet of the water tank (6) is connected with the inlet of the water pump (3) through the flow meter (1), the outlet of the water pump (3) is connected with the inlet of the electromagnetic scale inhibitor (4), and the outlet of the electromagnetic scale inhibitor (4) is connected with the inlet of the water tank (6) through the ball valve (5). The heating rod (9) and the temperature sensor (10) are arranged in the water tank (6), the temperature controller (8) is connected with the control end of the heating rod (9), the output end of the temperature sensor (10) is connected with the temperature controller (8), and the experimental solution (7) is arranged in the water tank (6). The electromagnetic scale inhibitor (4) is powered by a photovoltaic system, wherein the photovoltaic system includes a solar cell panel (11) and an inverter module (12), the solar cell panel (11) converts light energy into electrical energy, and the electrical energy is converted into alternating current by the inverter module (12) to power the electromagnetic scale inhibitor (4) to operate. The electromagnetic scale inhibitor (4) includes a test cavity, a signal generator and an electromagnetic coil wound on the outer wall of the test cavity, wherein the electromagnetic coil and the signal generator form a series loop, and the test cavity is connected with the water pump (3) and the ball valve (5). The working process is as follows: Starting stage: 1) the temperature controller (8) controls the heating rod (9) to heat the experimental solution (7) in the water tank (6) until the temperature measured by the temperature sensor (10) reaches the preset test temperature; 2) the solar cell panel (11) and the inverter module (12) are started, the water pump (3) is started and the ball valve (5) is opened, the experimental solution (7) in the water tank (6) is pumped out by the water pump (3), and then returned to the water tank (6) through the electromagnetic scale inhibitor (4) and the ball valve (5), the opening degree of the ball valve (5) and the power of the water pump (3) are adjusted, so that the flow meter (1) detects the preset test flow; 3) the electromagnetic scale inhibitor (4) is started, and the scale inhibition performance of the electromagnetic scale inhibitor (4) is tested. Stopping stage: the heating rod (9) is turned off; the electromagnetic scale inhibitor (4) is turned off; the inverter module (12) is turned off; the solar cell panel (11) is turned off; the water pump (3) is turned off; after the water in the water tank (6) is cooled to room temperature, the water in the water tank (6) is taken; the temperature sensor (10) is turned off, and the temperature monitoring is stopped; all power supplies are turned off.

2. The simple experimental device for testing scale inhibition performance according to claim 1, characterized in that, The outlet of the water tank (6) is connected with the inlet of the water pump (3) through the galvanized pipe (2), and the flow meter (1) is arranged on the galvanized pipe (2).

3. The simple experimental device for testing scale inhibition performance according to claim 1, wherein, In the test process, a magnetic field is applied to the experimental solution (7) in the test cavity by the electromagnetic coil.

4. The simple experimental device for testing scale inhibition performance according to claim 3, characterized in that, The strength of the magnetic field is adjusted by the number of turns of the electromagnetic coil.

5. The simple experimental device for testing scale inhibition performance according to claim 1, wherein, The experimental solution (7) is industrial circulating cooling water.

6. The simple experimental device for testing scale inhibition performance according to claim 1, wherein, In the test process, the flow of the experimental solution (7) through the electromagnetic scale inhibitor (4) is controlled by the ball valve (5) and the water pump (3).

7. The simple experimental set-up for testing scale inhibition performance according to claim 1, wherein, The flow meter (1) is a turbine flow meter.

8. A simple experimental method for testing scale inhibition performance, characterized in that, The simple experimental device for testing scale inhibition performance according to claim 1 comprises the following steps: Start stage: 1) start the heating rod (9) and the temperature sensor (10), the heating rod (9) heats the experimental solution (7) in the water tank (6) to the preset test temperature; 2) add the scale inhibitor into the water tank (6). Stop stage: turn off the heating rod (9); after the water temperature in the water tank (6) drops to room temperature, take the experimental solution (7) in the water tank (6); turn off the temperature sensor (10); turn off all power supplies.

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