Petroleum product non-ignition type closed-cup flash point measuring system

Abstract

The invention discloses an ignition-free closed-cup flash point measuring system for petroleum products. The ignition-free closed-cup flash point measuring system comprises a sample pretreatment unit, a flash separation unit, a constant-temperature control unit, a flash point detection unit and a data processing unit which are communicated in sequence. The sample pretreatment unit is used for removing solid impurities and moisture in a petroleum sample; the flash separation unit is used for converting the pretreated sample into oil vapor and liquid components; the constant-temperature control unit maintains the temperature stability of the system; the flash point detection unit detects the flammable flash state of the oil vapor in an optical mode; the data processing unit records and analyzes the detection data to output a flash point value. The invention further provides auxiliary modules such as a circulating purification unit and a safety monitoring unit, efficient, accurate and safe measurement of flash points of various petroleum products such as gasoline, diesel oil and lubricating oil is achieved through pressure grading flash evaporation and precise temperature control, the detection period is short, the automation degree is high, and the device is suitable for rapid flash point analysis of laboratories and industrial sites.

Description

Technical Field

[0001] This invention relates to the field of petroleum flash point determination technology, and more specifically, to a non-ignition closed-cup flash point determination system for petroleum products. Background Technology

[0002] Flash point is a key indicator for measuring the fire risk of petroleum products, directly related to fire safety during petroleum storage, transportation, and use, and is also one of the core parameters for assessing petroleum product quality. Currently, the flash point of petroleum is mainly determined using the closed-cup method and the open-cup method; however, these traditional methods have many shortcomings.

[0003] Regarding sample adaptability, traditional methods are poorly suited to complex petroleum samples containing solid impurities, moisture, or harmful chemical components. Impurities can easily lead to uneven heating and misinterpretation of flash signals. This is especially true for alternative fuel oils produced by processes such as waste plastic pyrolysis, where the tar and chlorine components can severely interfere with the test results. In terms of detection accuracy and efficiency, fluctuations in ambient temperature, humidity, air pressure, and human error can all cause significant errors. Traditional methods typically have a single test cycle exceeding 30 minutes, making it difficult to meet the rapid quality control requirements of continuous industrial production.

[0004] In terms of safety and environmental protection, traditional testing methods can easily lead to the leakage of flammable vapors and harmful components from petroleum samples, posing risks of fire and environmental pollution. Furthermore, traditional open-flame ignition methods lack sufficient explosion-proof performance in dense laboratory environments. In addition, while some existing petroleum processing systems involve processes such as distillation and gas-liquid separation, they primarily focus on fuel oil production and purification, and are not specifically designed for the accuracy, safety, and efficiency of flash point determination, thus making them unsuitable for standardized testing of petroleum flash points.

[0005] Therefore, there is an urgent need to develop a petroleum flash point determination system that is adaptable to a wide range of samples, has high detection accuracy, is safe and environmentally friendly, and has high detection efficiency, in order to solve many problems existing in the current technology. Summary of the Invention

[0006] In view of this, the present invention proposes a non-ignition closed-cup flash point determination system for petroleum products, which aims to solve the problems of poor sample adaptability, low detection accuracy and low detection efficiency of existing determination systems.

[0007] This invention proposes a non-ignition closed-cup flash point determination system for petroleum products, comprising: a sample pretreatment unit, a flash separation unit, a constant temperature control unit, a flash point detection unit, and a data processing unit connected in sequence; wherein, the sample pretreatment unit is used to remove solid impurities and moisture from the petroleum sample; the flash separation unit converts the pretreated petroleum sample into oil vapor and liquid components; the constant temperature control unit maintains the temperature stability of the flash separation unit and the flash point detection unit; the flash point detection unit detects the flammability and flash point state of the oil vapor; and the data processing unit records and analyzes the detection data to output the flash point value.

[0008] Furthermore, the sample pretreatment unit includes a filtration component and a dehydration component. The filtration component uses a double-layer ceramic filter membrane with a filtration accuracy of 0.1~1μm. The dehydration component achieves deep dehydration of the petroleum sample through molecular sieve adsorption, and the water content of the sample after dehydration is less than 0.05%.

[0009] Furthermore, the flash separation unit includes a sealed flash tank and a pressure regulating module. The sealed flash tank has a volume of 50-200 mL, and the pressure regulating module can control the pressure inside the tank at 5-15 mmHg. The staged flash evaporation of different volatile components can be achieved through pressure regulation.

[0010] Furthermore, the constant temperature control unit includes a heating component and a temperature sensor. The heating component adopts electromagnetic heating and the heating rate can be adjusted within the range of 1~5℃ / min. The temperature sensor has a measurement accuracy of ±0.1℃, and provides real-time feedback of temperature data and links with the heating component to achieve constant temperature control.

[0011] Furthermore, the flash point detection unit includes an ignition component, an optical detection component, and an explosion-proof component. The ignition component adopts an electric spark ignition method with an ignition frequency of 1 to 3 times per minute. The optical detection component captures the flash signal through an infrared sensor. The explosion-proof component is equipped with a pressure relief valve that automatically releases pressure when the pressure inside the can exceeds a set value by 20%.

[0012] Furthermore, it also includes a circulating purification unit, which is connected to the flash separation unit and is used to recover unburned oil vapor and condense and reflux it. The refluxed liquid can be re-entered into the sample pretreatment unit for recycling. The recovery rate of the circulating purification unit is not less than 90%.

[0013] Furthermore, the data processing unit includes a data storage module, a signal analysis module, and a result output module. The signal analysis module can eliminate interference signals and accurately identify the temperature value corresponding to the first flash. The result output module supports real-time display, data export, and historical record query functions.

[0014] Furthermore, an insulated conveying pipeline is provided between the flash separation unit and the flash point detection unit. The outer layer of the pipeline is wrapped with a ceramic fiber insulation layer with a thickness of 10-20mm to ensure that the temperature fluctuation of the oil vapor during the conveying process does not exceed ±0.5℃.

[0015] Furthermore, the system also includes a safety monitoring unit, which includes a combustible gas sensor and a temperature alarm module. When the concentration of combustible gas exceeds 10% of the lower explosive limit or the system temperature exceeds a set threshold, an audible and visual alarm is immediately triggered and the power supply to the heating and ignition components is cut off.

[0016] Furthermore, the system is adapted to determine the flash point of light and heavy petroleum samples. By switching the pressure parameters of the flash separation unit and the temperature range of the constant temperature control unit, it can detect the flash point of different types of petroleum products such as gasoline, diesel, and lubricating oil, with a detection cycle of no more than 25 minutes.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The sample pretreatment unit features a double-layer ceramic filtration system and a molecular sieve dehydration design, which can effectively remove solid impurities and moisture, making it suitable for light, heavy, and complex petroleum samples. The pressure controllable design of the flash separation unit and the high-precision temperature control function of the constant temperature control unit ensure stable oil vapor generation. Combined with infrared sensor detection and interference signal rejection algorithms, the flash point measurement error can be controlled within ±0.5℃, significantly improving detection accuracy. 2. By coordinating and linking various units, the testing process is optimized, and the single testing cycle does not exceed 25 minutes, which is significantly shorter than traditional methods; by switching pressure and temperature parameters, flash point testing of different types of petroleum products can be achieved without changing special equipment, meeting the rapid quality control needs of continuous industrial production. 3. The flash point detection unit adopts electric spark ignition and explosion-proof pressure relief design. The safety monitoring unit monitors the concentration of combustible gas and system temperature in real time. In case of abnormality, it automatically cuts off the power and alarms to eliminate the risk of fire. The circulation purification unit has a recovery rate of no less than 90% for unflammed oil vapor, reducing resource waste and harmful gas emissions. The air exhaust structure further filters organic compounds to reduce environmental pollution. 4. The data processing unit supports real-time display, data export, and historical record query functions without complex manual intervention; each unit of the system adopts a modular design, which is convenient for installation, maintenance and calibration, and the insulated conveying pipeline can avoid oil vapor temperature fluctuations, further ensuring the stability and reliability of the test results, and has broad industrial application prospects. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a structural diagram of the non-ignition closed-cup flash point determination system for petroleum products provided in an embodiment of the present invention; In the diagram: 01 - Sample inlet; 02 - Sample pretreatment unit; 03 - Filter assembly; 04 - Flash separation unit; 05 - Pressure regulation module; 06 - Flash point detection unit; 07 - Circulation purification unit; 08 - Reflux pump; 09 - Recovery tank; 10 - Data processing unit; 11 - Safety monitoring unit. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Reference Figure 1 In one specific embodiment of the present invention, a non-ignition closed-cup flash point determination system for petroleum products is provided. The system includes: a sample pretreatment unit 02, a flash separation unit 04, a flash point detection unit 06, and a data processing unit 10, connected in sequence; wherein, the sample pretreatment unit 02 is used to remove solid impurities and moisture from the petroleum sample; the flash separation unit 04 converts the pretreated petroleum sample into oil vapor and liquid components; the system achieves constant temperature control through heating devices and temperature sensors integrated in each unit to maintain the temperature stability of the flash separation unit 04 and the flash point detection unit 06; the flash point detection unit 06 detects the flammability and flash point state of the oil vapor; and the data processing unit 10 records and analyzes the detection data to output the flash point value.

[0021] It is understood that the system in this embodiment also includes a circulation purification unit 07 connected to the flash separation unit 04, a safety monitoring unit 11 for system safety monitoring, and a delivery pipeline connecting the flash separation unit 04 and the flash point detection unit 06. Each unit is sealed and connected via corrosion-resistant stainless steel pipes, and the pipe interfaces use flange sealing structures to ensure the overall airtightness of the system and prevent oil vapor leakage.

[0022] The sample enters the sample pretreatment unit 02 from the sample inlet 01. The unit includes a filter assembly 03 and is a cylindrical sealed tank with a sample inlet at the top, a pretreated sample outlet at the bottom, and a drain outlet on the side.

[0023] The filter assembly 03 uses a double-layer ceramic filter membrane. The upper filter membrane has a pore size of 1μm, the lower filter membrane has a pore size of 0.1μm, and the distance between the two membranes is 5mm. It is fixed in the middle of the inner cavity of the tank by bolts. It is used to filter solid impurities such as tar particles and mechanical impurities in petroleum samples in stages. The filtration pressure is controlled at 0.1~0.2MPa to ensure that the impurity removal rate is ≥99.5%.

[0024] The sample pretreatment unit 02 also includes a dehydration function, located below the filter assembly 03. It is filled with 4A molecular sieve adsorbent, with a molecular sieve layer height of 10cm. The sample residence time in the dehydration section is ≥5min, achieving deep dehydration through physical adsorption, ensuring that the water content of the dehydrated sample is ≤0.05%. The auxiliary structure has a flow regulating valve at the sample inlet to control the sample feed rate at 10-20mL / min; the drain outlet has a shut-off valve to periodically discharge impurities and deactivated molecular sieves trapped by the filter assembly 03.

[0025] The flash separation unit 04 includes a sealed flash tank and a pressure regulating module 05. The sealed flash tank has a double-layer jacket structure, with a steam outlet at the top, a liquid reflux port and a residue discharge port at the bottom, and a pre-treated sample inlet on the side.

[0026] The inner layer of the sealed flash evaporator is made of Hastelloy alloy, which is resistant to high temperature ≥300℃ and pressure ≥0.3MPa. The inner wall of the tank is polished to avoid sample residue. An anti-fog baffle is installed at the top of the tank to prevent liquid droplets from entering the subsequent pipeline with the steam.

[0027] The pressure regulation module 05 includes a vacuum pump, a pressure sensor, and a pressure controller connected to the sealed flash tank. The vacuum pump is a miniature rotary vane vacuum pump with a pumping speed of 0.5 L / s, which can stably control the pressure inside the tank at 5~15 mmHg. The pressure sensor has a measurement range of 0~50 mmHg and an accuracy of ±0.1 mmHg, and collects the pressure data inside the tank in real time and transmits it to the pressure controller. The pressure controller adjusts the working power of the vacuum pump through a PID algorithm to ensure that the pressure fluctuation inside the tank is ≤±0.2 mmHg.

[0028] The working logic is as follows: the pretreated petroleum sample enters the closed flash tank through the inlet. Under the set pressure, the low-boiling-point components are converted into oil vapor and enter the conveying pipeline through the vapor outlet. The unvaporized liquid components enter the circulation purification unit 07 through the liquid return port. A small amount of residue at the bottom of the tank is periodically discharged through the residue discharge port.

[0029] Specifically, the constant temperature control includes a heating component and a temperature sensor. The heating component uses electromagnetic heating and the heating rate can be adjusted within the range of 1~5℃ / min. The temperature sensor has a measurement accuracy of ±0.1℃, and it provides real-time feedback of temperature data and links with the heating component to achieve constant temperature control.

[0030] Understandably, independent temperature control modules are set up for the flash separation unit 04 and the flash point detection unit 06 respectively to ensure the temperature stability of each unit. The heating component of the flash separation unit 04 is an electromagnetic heating coil wrapped in the outer jacket of the sealed flash tank; the heating component of the flash point detection unit 06 is an electromagnetic heating plate built into the bottom of the detection tank. Electromagnetic heating provides rapid and uniform heating, and the heating rate can be steplessly adjusted within the range of 1~5℃ / min by the temperature controller.

[0031] The temperature sensor uses a PT100 platinum resistance temperature sensor with an accuracy of ±0.1℃. The temperature sensor probe of the flash separation unit 04 is inserted into the inner cavity of the sealed flash tank, and the temperature sensor probe of the flash point detection unit 06 is fixed in the center of the detection tank to collect temperature data in real time.

[0032] The temperature controller adopts a PLC controller with a built-in temperature control algorithm. After receiving the signal from the temperature sensor, it links the heating components to adjust the heating power, so that the temperature of the flash separation unit 04 is stabilized at the set value, and the temperature fluctuation of the flash point detection unit 06 is ≤ ±0.1℃.

[0033] Specifically, the flash point detection unit 06 includes a detection container, an ignition component, an optical detection component, and an explosion-proof component. The ignition component uses electric spark ignition with an ignition frequency of 1 to 3 times per minute. The optical detection component captures the flash signal through an infrared sensor. The explosion-proof component is equipped with a pressure relief valve that automatically releases pressure when the pressure inside the container exceeds a set value by 20%.

[0034] It is understandable that the flash point detection unit 06 includes a detection container, an ignition assembly, an optical detection assembly, and an explosion-proof assembly. The detection container is a cylindrical sealed structure with a vapor inlet and an explosion-proof port at the top and a gas outlet on the side.

[0035] The ignition assembly uses an electric spark igniter. The ignition electrode is installed inside the upper part of the detection tank. The ignition frequency is set to 1 to 3 times / minute by the data processing unit 10, and the duration of each ignition is 10ms to avoid safety hazards caused by continuous ignition.

[0036] The optical detection component includes an infrared transmitter and an infrared receiver, which are symmetrically installed in the middle of both sides of the detection tank. The infrared light wavelength is 850nm. When the oil vapor flashes, the flame will block or reflect the infrared light. After the infrared receiver captures the change in light signal, it transmits the electrical signal to the data processing unit 10. At the same time, it is equipped with a background light compensation module to avoid ambient light from interfering with the detection results.

[0037] The explosion-proof components include a pressure relief valve and a rupture disc installed at the explosion-proof port. When the pressure inside the detection tank exceeds the set value by 20%, the pressure relief valve automatically releases pressure. If the pressure relief fails, the rupture disc ruptures to release pressure, providing dual explosion-proof protection for the system's safety. The gas outlet is connected to the circulation purification unit 07 via a pipeline, and unburned oil vapor enters the subsequent recovery process.

[0038] Specifically, the data processing unit 10 includes a data storage module, a signal analysis module, and a result output module. The signal analysis module can eliminate interference signals and accurately identify the temperature value corresponding to the first flash. The result output module supports real-time display, data export, and historical record query functions.

[0039] Understandably, the data processing unit 10 includes a data storage module, a signal analysis module, and a result output module, which are integrated into the industrial panel PC and communicate with components such as the flash point detection unit 06, temperature sensor, and pressure sensor via data cables.

[0040] The data storage module has a built-in 16GB storage space, which can store temperature data, pressure data, flashover signal data, etc. in real time, with a storage time of ≥1 year, and supports data export. The signal analysis module uses a digital filtering algorithm to remove interference signals such as electromagnetic interference and light fluctuations. By identifying the signal abrupt change point transmitted by the infrared receiver, it accurately locates the moment of the first flashover and extracts the real-time temperature from the temperature sensor as the flash point value of the petroleum sample.

[0041] The results output module supports real-time display of flash point values ​​and detection curves, and is equipped with a USB interface and wireless transmission module to export test reports; it also has a historical record query function, which can retrieve past test data by date, sample number and other conditions.

[0042] Specifically, it also includes a circulating purification unit 07, which is connected to the flash separation unit 04 and is used to recover unburned oil vapor and condense and reflux it. The refluxed liquid can be re-entered into the sample pretreatment unit 02 for recycling. The recovery rate of the circulating purification unit 07 is not less than 90%.

[0043] It is understandable that the circulating purification unit 07 includes a condensation reflux assembly and a recovery tank 09. The condensation reflux assembly is a shell-and-tube condenser, the cooling medium is industrial cooling water, and the recovery tank 09 is made of 316L stainless steel.

[0044] The workflow is as follows: the unvaporized liquid discharged from the flash separation unit 04 and the unflashed fuel vapor discharged from the flash point detection unit 06 enter the condensation reflux assembly through pipelines. After the fuel vapor is cooled and condensed into liquid, it flows into the recovery tank 09 together with the unvaporized liquid. The recovery tank 09 is equipped with a pressure balancing valve at the top and a reflux pump 08 at the bottom. The reflux pump 08 is connected to the sample inlet of the sample pretreatment unit 02 through pipelines to realize the recycling treatment of samples that have not passed the test. The system recovery rate is ≥90%. The auxiliary structure is that a liquid level gauge is installed on the side of the recovery tank 09. When the liquid level reaches 80%, the reflux pump 08 starts automatically. An empty valve is also provided to periodically discharge the recovered qualified liquid or cleaning fluid.

[0045] Specifically, the system also includes a safety monitoring unit 11, which includes a combustible gas sensor and a temperature alarm module. When the concentration of combustible gas exceeds 10% of the lower explosive limit or the system temperature exceeds a set threshold, an audible and visual alarm is immediately triggered and the power supply to the heating and ignition components is cut off.

[0046] It is understood that the safety monitoring unit 11 includes a combustible gas sensor, a temperature alarm module and an emergency shut-off module. The combustible gas sensor is installed at the connection point of each unit, the temperature alarm module is linked with the temperature sensor, and the emergency shut-off module is electrically connected to the system power supply, heating components and ignition components.

[0047] The combustible gas sensor detects petroleum vapor, with a measurement range of 0–10% LEL and an accuracy of ±0.1% LEL. When the detected combustible gas concentration exceeds 10% LEL, it immediately sends a signal to the temperature alarm module. The temperature alarm module operates by triggering an audible and visual alarm when the temperature of any unit in the system exceeds a set threshold or the combustible gas concentration exceeds the limit; the alarm light flashes red.

[0048] The emergency shut-off module automatically cuts off the main power supply to the system and shuts off the power supply circuits for the heating and ignition components while triggering an alarm, preventing fires or explosions. A manual reset button is provided, requiring manual reset before the system can be restarted after troubleshooting.

[0049] The pipeline is made of stainless steel and wrapped with an outer insulation layer to reduce temperature loss of oil vapor during transportation. Both ends of the pipeline are sealed to the vapor outlet of flash separation unit 04 and the vapor inlet of flash point detection unit 06 via flanges. The flange gaskets are made of polytetrafluoroethylene to ensure airtightness. A temperature monitoring point is set in the middle of the pipeline, equipped with a miniature temperature sensor to monitor the oil vapor temperature in real time and ensure that the temperature fluctuation is ≤±0.5℃.

[0050] Understandably, the workflow of this system is as follows: The petroleum sample to be tested is injected through the sample inlet 01, and the flow rate is adjusted to 15 mL / min. The sample passes through a double-layer ceramic filter membrane to remove solid impurities, and then passes through a molecular sieve dehydration section for deep dehydration. The pretreated sample enters the flash separation unit 04.

[0051] Start the vacuum pump of the pressure regulating module 05 to regulate the pressure in the sealed flash tank to 8 mmHg and stabilize it; start the constant temperature control to heat the temperature of the flash separation unit 04 to 120℃. The petroleum sample flashes under constant pressure and temperature. The low boiling point oil vapor enters the conveying pipeline through the vapor outlet, and the unvaporized liquid enters the circulation purification unit 07 through the liquid return port.

[0052] Oil vapor enters the detection tank of flash point detection unit 06 through the delivery pipeline; the constant temperature control maintains the temperature of the detection tank at the same temperature as the flash separation unit, the ignition component is activated, and the optical detection component monitors the flash signal in real time; when the first flash is detected, the signal analysis module records the corresponding temperature, which is the flash point value of the sample.

[0053] The data processing unit 10 stores data such as temperature, pressure, and flash signal during the detection process, automatically generates a test report, and displays the flash point value and test curve in real time through the result output module. It supports USB export or wireless transmission.

[0054] Unflammed oil vapor enters the circulation purification unit 07 through the gas outlet of the detection tank. After being cooled into liquid by the condensation reflux assembly, it is stored in the recovery tank 09. When the liquid level reaches 80%, the reflux pump 08 is started to return the liquid to the sample pretreatment unit 02 for circulation treatment. The safety monitoring unit 11 monitors the concentration of combustible gas and the system temperature throughout the process. If any abnormality occurs, an alarm is immediately triggered and the power is cut off.

[0055] Those skilled in the art will understand that embodiments of this application can be provided as systems, system products, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] This application is described with reference to flowchart illustrations and / or block diagrams of systems, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0057] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0059] 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 non-ignition closed-cup flash point determination system for petroleum products, characterized in that, It includes a sample pretreatment unit, a flash separation unit, a constant temperature control unit, a flash point detection unit, and a data processing unit connected in sequence; among which, The sample pretreatment unit is used to remove solid impurities and moisture from petroleum samples; The flash separation unit converts the pretreated petroleum sample into oil vapor and liquid components. The constant temperature control unit maintains the temperature stability of the flash separation unit and the flash point detection unit; The flash point detection unit detects the flammability and flashover state of the oil vapor; The data processing unit records and analyzes the detection data to output the flash point value.

2. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The sample pretreatment unit includes a filtration component and a dehydration component. The filtration component uses a double-layer ceramic filter membrane with a filtration accuracy of 0.1~1μm. The dehydration component achieves deep dehydration of the petroleum sample through molecular sieve adsorption, and the water content of the sample after dehydration is less than 0.05%.

3. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The flash separation unit includes a sealed flash tank and a pressure regulating module. The sealed flash tank has a volume of 50-200 mL, and the pressure regulating module can control the pressure inside the tank at 5-15 mmHg. The staged flash evaporation of different volatile components can be achieved through pressure regulation.

4. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The constant temperature control unit includes a heating component and a temperature sensor. The heating component uses electromagnetic heating and the heating rate can be adjusted within the range of 1~5℃ / min. The temperature sensor has a measurement accuracy of ±0.1℃, and provides real-time temperature data feedback and links with the heating component to achieve constant temperature control.

5. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The flash point detection unit includes an ignition component, an optical detection component, and an explosion-proof component. The ignition component uses electric spark ignition with an ignition frequency of 1 to 3 times per minute. The optical detection component captures the flash signal through an infrared sensor. The explosion-proof component is equipped with a pressure relief valve that automatically releases pressure when the pressure inside the tank exceeds a set value by 20%.

6. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, It also includes a circulation purification unit, which is connected to the flash separation unit and is used to recover unburned oil vapor and condense and reflux it. The refluxed liquid can be re-entered into the sample pretreatment unit for recycling. The recovery rate of the circulation purification unit is not less than 90%.

7. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The data processing unit includes a data storage module, a signal analysis module, and a result output module. The signal analysis module can eliminate interference signals and accurately identify the temperature value corresponding to the first flash. The result output module supports real-time display, data export, and historical record query functions.

8. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, A heat-insulated conveying pipeline is installed between the flash separation unit and the flash point detection unit. The outer layer of the pipeline is wrapped with a ceramic fiber insulation layer with a thickness of 10-20mm to ensure that the temperature fluctuation of the oil vapor during the conveying process does not exceed ±0.5℃.

9. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The system also includes a safety monitoring unit, which includes a combustible gas sensor and a temperature alarm module. When the concentration of combustible gas exceeds 10% of the lower explosive limit or the system temperature exceeds a set threshold, an audible and visual alarm is immediately triggered and the power supply to the heating and ignition components is cut off.

10. The non-ignition closed-cup flash point determination system for petroleum products according to claim 1, characterized in that, The system is adapted to determine the flash point of both light and heavy petroleum samples. By switching the pressure parameters of the flash separation unit and the temperature range of the constant temperature control unit, it can detect the flash point of different types of petroleum products such as gasoline, diesel, and lubricating oil, with a detection cycle of no more than 25 minutes.

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