Automatic jet fuel total acid value tester

Abstract

The utility model relates to an automatic jet fuel total acid value determinator, which realizes rapid and accurate determination of the jet fuel total acid value and provides powerful technical support for quality control of jet fuel, and adopts the technical scheme that a switch and an indicator light are arranged on a front panel of a main machine box body, and two layers of platforms are arranged on the left side of the main machine box body; a peristaltic pump is placed on the upper-layer platform, a reagent bottle connected with the peristaltic pump is placed on the lower-layer platform, a magnetic stirring motor and a test bottle connected with the magnetic stirring motor are arranged in the middle of the middle of the main machine box body, and a hollow back plate for a pipeline cable to penetrate through is arranged on the rear side of the middle of the main machine box body. By combining professional image processing software, the automatic degree is high, the repeatability is good, and the titration end point can be accurately and quickly determined, so that a test result can be quickly obtained.

Description

An automatic jet fuel total acid value analyzer Technical Field

[0001] This utility model relates to the field of petrochemical testing and analysis, and in particular to an automatic jet fuel total acid value analyzer. Background Technology

[0002] Jet fuel is a primary energy source in the aviation industry, and its quality directly affects flight safety and engine performance. Total acid number (TOF) is a key quality indicator for jet fuel, reflecting the content of acidic substances in the fuel. Acidic substances can corrode engine components, affecting engine reliability and lifespan, and thus threatening flight safety. Therefore, accurately determining the TOF of jet fuel is crucial for ensuring jet fuel quality and safeguarding aviation safety.

[0003] Traditional methods suffer from significant human error: Traditional total acid value determination methods typically employ manual titration, relying heavily on the experience and skills of the operator. Differences among operators in endpoint determination and reagent dosage control can lead to poor repeatability and accuracy. Low analytical efficiency: Manual operation is cumbersome, involving multiple steps such as sample preparation, titration, data recording, and calculation, resulting in significant time consumption and failing to meet the demands of rapid testing of modern aviation fuels. Especially in busy locations like airports, where rapid and accurate fuel quality information is crucial, traditional methods often cannot provide results in a timely manner. Furthermore, some reagents used in traditional methods are corrosive or toxic, such as the potassium hydroxide-isopropanol titrant. Accidental skin contact or inhalation of volatile gases during operation can pose health risks to operators. Additionally, reagent emissions can pollute the environment.

[0004] With the continuous advancement of science and technology, automation technology has been widely applied in the field of analytical testing. Automated instruments can reduce the interference of manual operation, improve the accuracy and repeatability of analytical results, and greatly improve analytical efficiency. Applying automation technology to the determination of total acid number of jet fuel has become an effective way to overcome the limitations of traditional determination methods. Therefore, it is imperative to invent an automated total acid number analyzer for jet fuel. Summary of the Invention

[0005] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an automatic jet fuel total acid value analyzer, which realizes the rapid and accurate determination of the total acid value of jet fuel, and provides strong technical support for the quality control of jet fuel.

[0006] The technical solution provided by this utility model includes a main unit housing, a peristaltic pump, reagent bottles, and test bottles. A switch and indicator light are provided on the front panel of the main unit housing. Two platforms are provided on the upper left side of the main unit housing; the peristaltic pump is placed on the upper platform, and the reagent bottle connected to the peristaltic pump is placed on the lower platform. A magnetic stirring motor and a test bottle connected to the magnetic stirring motor are located in the middle of the main unit housing. A hollow back panel is provided on the rear side of the middle section for pipes and cables to pass through. A fan is also installed inside the hollow back panel. The unit has a ventilation opening, an aviation connector connected to the backlight, a gas connector connected to the nitrogen source, and a liquid connector connected to the peristaltic pump. A lower guide rail is located on the front side of the middle section, and an upper guide rail is located on the top of the hollow back panel. The top of the door is placed inside the upper guide rail, and the bottom is placed inside the lower guide rail. A proximity switch is located on the upper guide rail. Side panels are located on both the left and right sides of the middle section. A control panel is located on the right side of the main unit. A USB interface, a magnetic adjustment knob connected to the magnetic stirring motor, and a flow meter connected to the nitrogen source are located on the right side panel of the main unit.

[0007] Furthermore, the peristaltic pump is connected to the test bottle via a liquid interface.

[0008] Furthermore, an industrial camera is mounted on the right side panel in the middle of the main unit housing.

[0009] Furthermore, a backlight is provided on the lower part of the left side panel in the middle of the main unit housing.

[0010] Furthermore, the door body is matched in shape and size with the side panels on the left and right sides of the middle part of the main unit housing, so that the door body can move freely on the upper and lower guide rails.

[0011] Furthermore, the door is fitted with three opaque glass panels.

[0012] Furthermore, the main unit housing contains an industrial control motherboard, which is connected to the control panel via wires. The motherboard is connected to the industrial camera and data acquisition card via USB interfaces. The data acquisition card is connected to the proximity switch via pins 1, 2, and 3 of the J1 interface, and to the IN3, IN2, and IN1 pins of the relay module via pins 2, 3, and 4 of the J14 interface. It is also connected to the STP, GND, and COM pins of the stepper motor closed-loop control board of the peristaltic pump via pins 5 and 8 of the J14 interface. The NO3 pin of the relay module is connected to the backlight via a voltage regulator module, and the NO2 pin of the relay module is connected to the nitrogen valve. The nitrogen valve is connected in parallel with the backlight and grounded. The NO1 pin of the relay module is connected to the magnetic stirring motor and the voltage regulator module connected to the magnetic stirring motor. The voltage regulator module is connected to the power supply via a transformer, and the power supply is connected to the fan via wires.

[0013] Preferably, the control screen is an 8-inch IPS LCD screen, model GN080WX1-206, with a resolution of 1280*800 and an interface of LVDS40 or an 8-inch touch screen, model G080U4I10S01-161, USB, IIC, ILI2511.

[0014] Preferably, the proximity switch is model PR12-4DN.

[0015] Preferably, the data acquisition card model is DAQ-2201VER2.1.

[0016] Preferably, the magnetic stirring motor is an R-3625 magnetic stirring motor.

[0017] Preferably, the peristaltic pump head is model S-1B+TH10B and the stepper motor is model 42HS4013A6C.

[0018] Preferably, the relay module model is RM-10A1R4PM.

[0019] Preferably, the voltage regulating module and the voltage stabilizing module are both LM317 adjustable voltage stabilizing power supply modules.

[0020] The beneficial technical effects of this utility model are as follows:

[0021] 1) This invention is applicable to the determination of jet fuels with a total acid value of 0.000-0.100 mg KOH / g. It employs a CDD industrial camera to acquire real-time sample color changes, combined with professional image processing software, resulting in a high degree of automation, good repeatability, and accurate and rapid determination of the titration endpoint, thus quickly obtaining experimental results.

[0022] 2) The entire experiment is fully automated after the sample, solvent, and indicator are added. The titration display is intuitive, the operation is convenient, and the results are highly accurate. The measuring chamber has a built-in backlight to ensure color reproduction accuracy; the color temperature is 4000K–8000K, and the brightness can be manually adjusted. The repeat titration volume, titration time interval, and titration speed can be preset; the repeat titration volume accuracy is 0.001mL, and the titration volume is calibrable. The nitrogen flow rate is controllable from 10mL / min to 1000mL / min. The magnetic stirring speed is freely adjustable. Attached Figure Description

[0023] Figure 1 is a three-dimensional structural diagram of this utility model.

[0024] Figure 2 is a three-dimensional structural diagram of this utility model.

[0025] Figure 3 is a schematic diagram of the circuit connection of this utility model.

[0026] Figure 4 is a schematic diagram showing the blank test status of this utility model at the "Status" section below the test interface.

[0027] Figure 5 is a schematic diagram showing the volume of the standard solution used in the blank test of this utility model in the square below "Blank Consumption Volume".

[0028] Figure 6 shows the volume of the standard solution used in the sample test of this utility model displayed in the box below "Sample Consumption Volume", and the test results displayed in the box below "Total Acid Value".

[0029] In the diagram, 1-door body, 2-main unit housing, 3-backlight, 4-magnetic stirring motor, 5-test bottle, 6-guide rail, 7-switch, 8-indicator light, 9-control panel, 10-USB interface, 11-magnetic adjustment knob, 12-flow meter, 13-reagent bottle, 14-peristaltic pump, 15-industrial camera, 16-gas interface, 17-ventilation port, 18-proximity switch, 19-aviation connector interface, 20-liquid interface. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Referring to Figures 1-2, this utility model includes a main unit housing, a peristaltic pump, reagent bottles, and test bottles. A switch 7 and an indicator light 8 are provided on the front panel of the main unit housing 2. Two platforms are provided on the upper left side of the main unit housing 2; the peristaltic pump 14 is placed on the upper platform, and the reagent bottle 13 connected to the peristaltic pump 14 is placed on the lower platform. A magnetic stirring motor 4 and a test bottle 5 connected to the magnetic stirring motor 4 are located in the middle of the main unit housing 2. A hollow back panel for pipes and cables to pass through is provided on the rear side of the middle section. A fan is also provided on the hollow back panel, which includes a ventilation opening 17 for the fan and a backlight 3. The system includes a connecting port 19, a gas port 16 connected to a nitrogen source, and a liquid port 20 connected to a peristaltic pump 14. A lower guide rail 6b is provided on the front side of the middle section, and an upper guide rail 6a is provided on the top of the hollow back panel. The top of the door 1 is placed inside the upper guide rail 6a, and the bottom is placed inside the lower guide rail 6b. A proximity switch 18 is provided on the upper guide rail 6a. Side panels are provided on both the left and right sides of the middle section. A control panel 9 is provided on the right side of the main unit housing 2. A USB port 10, a magnetic adjustment knob 11 connected to the magnetic stirring motor 4, and a flow meter 12 connected to the nitrogen source are provided on the right side panel of the main unit housing 2.

[0032] Furthermore, the peristaltic pump 14 is connected to the test bottle 5 via the liquid interface 20.

[0033] Furthermore, an industrial camera 15 is mounted on the right side panel in the middle of the main unit housing 2.

[0034] Furthermore, a backlight 3 is provided on the lower part of the left side panel in the middle of the main unit housing 2.

[0035] Furthermore, the door 1 is matched in shape and size with the side panels on the left and right sides of the middle part of the main unit housing 2, so that the door 1 can move freely on the upper guide rail 6a and the lower guide rail 6b.

[0036] Furthermore, three opaque glass panels are installed on the door body 1.

[0037] Furthermore, the main unit housing 2 contains an industrial control motherboard, which is connected to the control panel 9 via wires. The industrial control motherboard is connected to the industrial camera 15 and the data acquisition card via USB interface 10. The data acquisition card is connected to the proximity switch 18 via pins 1, 2, and 3 of the J1 interface, and to the IN3, IN2, and IN1 pins of the relay module via pins 2, 3, and 4 of the J14 interface. It is also connected to the STP, GND, and COM pins of the stepper motor closed-loop control board of the peristaltic pump 14 via pins 5 and 8 of the J14 interface. The NO3 pin of the relay module is connected to the backlight 3 via a voltage regulator module, and the NO2 pin of the relay module is connected to the nitrogen valve. The nitrogen valve is connected in parallel with the backlight 3 and grounded. The NO1 pin of the relay module is connected to the magnetic stirring motor and the voltage regulator module connected to the magnetic stirring motor. The voltage regulator module is connected to the power supply via a transformer, and the power supply is connected to the fan via wires.

[0038] Preferably, the control screen 9 is an 8-inch IPS LCD screen, model GN080WX1-206, with a resolution of 1280*800, and an interface of LVDS40 or an 8-inch touch screen, model G080U4I10S01-161, USB, IIC, ILI2511.

[0039] Preferably, the proximity switch 18 is model PR12-4DN.

[0040] Preferably, the data acquisition card model is DAQ-2201VER2.1.

[0041] Preferably, the magnetic stirring motor 4 is an R-3625 magnetic stirring motor.

[0042] Preferably, the peristaltic pump 14 has a pump head model of S-1B+TH10B and a stepper motor model of 42HS4013A6C.

[0043] Preferably, the relay module model is RM-10A1R4PM.

[0044] Preferably, the voltage regulating module and the voltage stabilizing module are both LM317 adjustable voltage stabilizing power supply modules.

[0045] The switch 7 controls the on / off state of the entire circuit. After being turned on, the current is transmitted to the indicator light 8 to display the working status, and at the same time, it supplies power to other electrical components such as the control panel 9. The control panel 9 can be connected to external devices via the USB interface 10 for data transmission, program import and export, and other operations. The test bottle 5 is placed on the magnetic stirring motor 4, and the stirring intensity is controlled by adjusting the magnetic adjustment knob 11. The peristaltic pump 14 can be connected to the test bottle 5 through a pipe for liquid transfer. The backlight 3 provides illumination for the test area, making it easy to observe the situation inside the test bottle 5. The ventilation port 17 is used for air circulation and heat dissipation inside the equipment. The proximity switch 18, the aviation plug interface 19, the liquid interface 20, and the gas interface 16 are used to sense the approach of objects, transmit signals between equipment, and handle liquid inlet and outlet and gas inlet and outlet, respectively. The industrial camera 15 is installed in a suitable position to capture and record the test process of the test bottle 5 and other components. The top of the door 1 is placed in the upper guide rail 6a, and the bottom is placed in the lower guide rail 6b. The door 1 can slide left and right within the upper guide rail 6a and the lower guide rail 6b, covering the left side and middle of the main unit.

[0046] In the circuit section of this utility model, the power input is AC220V, which is split into two paths after a fuse. One path connects to an 80*80 fan, and the other path connects to a voltage regulator module via a transformer. The voltage regulator module is electrically connected to a DC12V / 3000RPM magnetic stirring motor. A switching power supply (LM35-22B24) converts AC220V to 24V output to power 24V backlights and other 24V devices. The 24V relay module has NO1-NO4 interfaces to receive control signals and control the on / off state of related devices. Its input signals are connected to the M56 industrial control motherboard J1900 and the data acquisition and control board DAQ-2201VER2.1. The M56 industrial control motherboard J1900 connects to an 8-inch IPS LCD screen and an 8-inch touchscreen via USB for human-machine interaction. The industrial control motherboard also connects to an industrial camera for image acquisition. It receives proximity switch signals to detect the approach of objects. The DAQ-2201VER2.1 data acquisition and control board connects to the stepper motor closed-loop control board to control the stepper motor, which drives the peristaltic pump head and pump tube. It is also connected to a 24V relay module to participate in the equipment control logic.

[0047] The experimental steps for this utility model are as follows:

[0048] Before the test, first turn on the power, turn on the instrument's "Power" and "Start" buttons, open the "Automatic Jet Fuel Total Acid Number" test system icon on the computer desktop, the test interface will appear, and the test will begin.

[0049] A. Blank test

[0050] 1. After confirming that all settings are correct, accurately add 100ml of pre-prepared titration solvent and 0.1ml of p-naphthol benzene indicator solution to a dry and clean titration bottle. Place the titration bottle on the bottle holder, purge the reagent tube to remove air bubbles, and then put the cap with the burette on the titration bottle and connect the nitrogen tube.

[0051] 2. In the test interface, select "Blank" under "Test Selection", then click the "Test Stop" button. The status will then display "Test Start". Adjust the "Flow Meter" on the right to make the nitrogen flow rate 600-800 ml / min. Adjust the "Speed ​​Adjustment" knob to make the magnetic stirrer reach a suitable stirring speed. In this state, blow nitrogen into the mixed liquid for 3 minutes.

[0052] 3. Using the rectangle or circle tool on the left, draw a rectangle or circle within the colorless area of ​​the solution on the titration flask, then click "ROI" to select the measurement area. After 3 minutes, the instrument will automatically titrate with potassium hydroxide isopropanol standard titration solution. The test status will be displayed at the "Status" section at the bottom of the test interface, as shown in Figure 4. Titration will automatically stop when a bright green color appears and remains for 15 seconds, and the hue, saturation, and brightness values ​​are all within the set range. The blank test will then end, and nitrogen and stirring will automatically stop. The volume of the standard solution used in the blank test is displayed in the box below "Blank Consumption Volume," as shown in Figure 5.

[0053] B. Sample Testing

[0054] 1. In another dry and clean titration flask, accurately add 100 ml of the pre-prepared titration solvent and 100 g ± 5 g of the sample, and add 0.1 ml of p-naphthol benzene indicator solution;

[0055] 2. In the test interface, select "Sample" under "Test Selection", then click the "Test Stop" button. The status will then display "Test Start". Adjust the "Flow Meter" on the right to make the nitrogen flow rate 600-800 ml / min. Adjust the "Speed ​​Adjustment" knob to make the magnetic stirrer reach a suitable stirring speed. In this state, blow nitrogen into the mixed liquid for 3 minutes.

[0056] 3. Using the rectangular or circular tool on the left, draw a rectangle or circle within the colorless area of ​​the solution on the titration flask, then click "ROI" to select the measurement area. After 3 minutes, the instrument will automatically titrate with potassium hydroxide isopropanol standard titration solution. Similarly, when a bright green color appears and lasts for 15 seconds, and the hue, saturation, and brightness values ​​are all within the set range, the titration will automatically stop, the sample test will end, and nitrogen and stirring will automatically stop. The volume of the standard solution used in the sample test is displayed in the box below "Sample Consumption Volume," and the test results are displayed in the box below "Total Acid Value," as shown in Figure 6.

[0057] This invention employs a machine vision-based target-based color image segmentation and detection method. The entire experiment is fully automated after the sample, solvent, and indicator are added. The titration display is intuitive, operation is convenient, and the results are highly accurate. A 5-megapixel high-definition color CCD industrial camera is used, with image output format MJPEG / YUY2, a maximum effective pixel size of 2596x1944@30fps, and a spectral range of 400nm~1030nm. The system performs real-time acquisition, color segmentation, recognition, and processing. It uses a precise HSL color model to describe colors, performs separation calculations on the extracted color information, dynamically displays the histograms of each component, and performs color thresholding to obtain the color information of the ROI region. This information is then compared with the endpoint color in the background database to determine the endpoint. The region of interest can be manually selected, reducing the amount of image processing data and improving system processing speed and real-time performance. An indoor backlight is used to ensure color reproduction accuracy, with a color temperature of 4000K~8000K, and the brightness can be manually adjusted. The repeat titration volume, titration time interval, and titration speed can be preset, with a repeat titration volume accuracy of 0.001 mL. The titration volume is calibrable. The nitrogen flow rate is controllable from 10 mL / min to 1000 mL / min. The magnetic stirring speed is freely adjustable.

Claims

1. An automatic total acid number tester for jet fuel, comprising a main box, a peristaltic pump, a reagent bottle and a test bottle, characterized in that, The front panel of the main unit housing (2) is equipped with a switch (7) and an indicator light (8). On the upper left side of the main unit housing (2), there are two platforms. The upper platform holds a peristaltic pump (14), and the lower platform holds a reagent bottle (13) connected to the peristaltic pump (14). In the middle of the main unit housing (2), there is a magnetic stirring motor (4) and a test bottle (5) connected to the magnetic stirring motor (4). On the rear side of the middle, there is a hollow back panel for pipes and cables to pass through. A fan is also installed inside the hollow back panel. The hollow back panel has a fan vent (17), an aviation connector (19) connected to the backlight (3), and a nitrogen source. The gas interface (16) and the liquid interface (20) connected to the peristaltic pump (14) are provided with a lower guide rail (6b) on the front side of the middle section, an upper guide rail (6a) is provided on the top of the hollow back panel, the top of the door (1) is placed in the upper guide rail (6a) and the bottom is placed in the lower guide rail (6b), a proximity switch (18) is provided on the lower guide rail (6b), side panels are provided on both the left and right sides of the middle section, a control panel (9) is provided on the right side of the main unit housing (2), a USB interface (10), a magnetic adjustment knob (11) connected to the magnetic stirring motor (4) and a flow meter (12) connected to the nitrogen source are provided on the right side panel of the main unit housing (2).

2. The automatic total jet fuel acid number tester according to claim 1, characterized in that, The peristaltic pump (14) is connected to the test bottle (5) via the liquid interface (20).

3. The automatic jet fuel total acid number analyzer according to claim 1, characterized in that, An industrial camera (15) is mounted on the right side panel in the middle of the main unit housing (2).

4. The automatic total jet fuel acid number tester according to claim 1, characterized in that, A backlight (3) is provided on the lower part of the left side panel in the middle of the main unit housing (2).

5. The automatic jet fuel total acid number analyzer according to claim 1, characterized in that, The door (1) is matched in shape and size with the side panels on the left and right sides of the middle part of the main unit housing (2) so that the door (1) can move freely on the upper guide rail (6a) and the lower guide rail (6b).

6. The automatic jet fuel total acid number analyzer according to claim 1, characterized in that, The door (1) is fitted with three opaque glass panels.

7. The automatic total jet fuel acid number tester according to claim 1, characterized in that, The main unit housing (2) contains an industrial control motherboard. The industrial control motherboard is connected to the control panel (9) via wires. The industrial control motherboard is connected to the industrial camera (15) and the data acquisition card via the USB interface (10). The data acquisition card is connected to the proximity switch (18) via pins 1, 2, and 3 of the J1 interface. The pins 2, 3, and 4 of the J14 interface are connected to the IN3, IN2, and IN1 pins of the relay module, respectively. The pins 5 and 8 of the J14 interface are connected to the STP, GND, and COM pins of the stepper motor closed-loop control board of the peristaltic pump (14). The NO3 pin of the relay module is connected to the backlight (3) via the voltage regulation module. The NO2 pin of the relay module is connected to the nitrogen valve. The nitrogen valve is connected in parallel with the backlight (3) and grounded. The NO1 pin of the relay module is connected to the magnetic stirring motor and the voltage stabilizing module connected to the magnetic stirring motor, respectively. The voltage stabilizing module is connected to the power supply via a transformer. The power supply is connected to the fan via wires.

8. The automatic total jet fuel acid number tester according to claim 7, characterized in that, The control screen (9) is an 8-inch IPS LCD screen, model GN080WX1-206, with a resolution of 1280*800, and an interface of LVDS40 or an 8-inch touch screen, model G080U4I10S01-161, USB.IIC.ILI2511.

9. The automatic total jet fuel acid number tester according to claim 7, characterized in that, The proximity switch (18) is model PR12-4DN; the relay module is model RM-10A1R4PM; the voltage regulating module and the voltage stabilizing module are both LM317 adjustable voltage stabilizing power supply modules.

10. The automatic jet fuel total acid number analyzer according to claim 7, characterized in that, The data acquisition card is model DAQ-2201VER2.1; the magnetic stirring motor (4) is R-3625 magnetic stirring motor; the peristaltic pump (14) has a pump head model S-1B+TH10B and a stepper motor model 42HS4013A6C.

Images