CN210269693U - Device for measuring oxidation stability of biodiesel - Google Patents
Device for measuring oxidation stability of biodiesel Download PDFInfo
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- CN210269693U CN210269693U CN201921208439.8U CN201921208439U CN210269693U CN 210269693 U CN210269693 U CN 210269693U CN 201921208439 U CN201921208439 U CN 201921208439U CN 210269693 U CN210269693 U CN 210269693U
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Abstract
The utility model discloses a device for measuring oxidation stability of biodiesel, which comprises an air filter, an air regulating valve, a test tube, a measuring cup, a measuring electrode, an oil bath device, a conduit I, a conduit II, a conduit III, an input conduit and an output conduit; the test tube is inserted into the oil bath device, a biodiesel sample to be measured is contained in the test tube, distilled water is contained in the measuring cup, and the detection end of the measuring electrode is inserted below the surface of the distilled water; the other end of the measuring electrode extends out of the measuring cup and is externally connected with a microprocessor, and the output end of the microprocessor is connected with an LCD display. The utility model discloses a technique such as oil bath heating, gaseous leading-in, conductivity record flex point are taken to the device, realize sample short-term test, can satisfy biodiesel oxidation stability survey demand, and the analysis time that significantly reduces improves analysis efficiency.
Description
Technical Field
The utility model belongs to the technical field of biodiesel analytical equipment, concretely relates to be used for biodiesel oxidation stability measuring device.
Background
The biodiesel is a green renewable biomass energy source and has wide development prospect. Oxidation stability refers to the ability of a petroleum product to resist heat and oxidation, maintain its properties, and not undergo permanent changes when stored for long periods or used at high temperatures for long periods. Due to oxidation, the petroleum products often have reduced free alkali content or increased free organic acid content, reduced dropping point, darkened appearance color, abnormal odor, limited consistency and strength, reduced similar viscosity, corrosive products and substances damaging the lubricating grease structure, and the separation of soap and oil is caused. The oxidation stability is a main index for determining the stability of the diesel oil, and is also an important detection item for the delivery of finished diesel oil products. If the result is too large, excessive sludge can be generated in the centrifuge and the filter, the filter is blocked, an oil injector is polluted, and poor combustion is caused.
In the long-term storage process, the biodiesel with high oxidation stability can generate oil sludge at the bottom of the oil tank, so that the pumping is difficult. The current method for measuring the oxidation stability of biodiesel in China is SH/T0175-. Therefore, the method greatly delays the time of import and export customs clearance and is not suitable for rapid detection of industrial and commercial spot check. In order to establish a simple and rapid method for evaluating the oxidation stability of biodiesel, a device for rapidly determining the oxidation stability of diesel is developed.
Disclosure of Invention
The not enough to prior art, the utility model discloses a be used for biodiesel oxidation stability measuring device is provided, solve the measuring method among the prior art long, the low and poor technical problem of repeatability of precision consuming time.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a device for measuring oxidation stability of biodiesel comprises an air filter, an air regulating valve, a test tube, a measuring cup, a measuring electrode, an oil bath device, a conduit I, a conduit II, a conduit III, an input conduit and an output conduit; the inlet end of the air filter is connected with a compressed air source device through an input conduit, and the outlet end of the air filter is communicated with the inlet end of the air regulating valve through a conduit I; the top end of the test tube is provided with a piston I, the test tube is inserted into an oil bath device, a biodiesel sample to be detected is contained in the test tube, one end of the guide tube II is communicated with the outlet end of the air regulating valve, and the other end of the guide tube II penetrates through the piston I and is inserted into the bottom of the biodiesel sample in the test tube; a piston II is installed at the top end of the measuring cup, distilled water is contained in the measuring cup, one end of the guide pipe III penetrates through the piston I and is inserted into the test tube, and the other end of the guide pipe III penetrates through the piston II and is inserted to the bottom of the distilled water in the measuring cup; one end of the output conduit is inserted into the measuring cup through the piston II, and the other end of the output conduit is arranged beside an air vent of a laboratory ventilation cabinet; the detection end of the measuring electrode is inserted below the surface of the distilled water; the other end of the measuring electrode extends out of the measuring cup and is externally connected with a microprocessor, and the output end of the microprocessor is connected with an LCD display.
Preferably, the air regulating valve is provided with a pressure gauge.
Preferably, the microprocessor adopts an STM32F101 singlechip of a Cortex-M3 kernel.
Further, the method for measuring the oxidation stability of the biodiesel comprises the following steps:
(1) confirming that the interior of the test tube is clean, pouring the biodiesel sample to be detected into the test tube, and placing the test tube in an oil bath device;
(2) starting a compressed air source device, and leading air into the test tube after passing through an input conduit, an air filter, a conduit I, an air regulating valve and a conduit II in sequence;
(3) connecting the test tube with the measuring cup through a conduit III, so that carboxylic acid volatile matters in the biodiesel sample are led into distilled water in the measuring cup through flowing air, and ensuring that the conduit III is completely inserted into the bottom of the distilled water in the measuring cup;
(4) ensuring that the detection end of the measuring electrode is placed in the distilled water in the measuring cup;
(5) and starting the microprocessor, acquiring the conductivity of the liquid in the measuring cup in real time through the measuring electrode, calculating a second derivative of a conductivity curve by using the microprocessor, displaying the conductivity curve, a real-time value of the second derivative of the conductivity and a maximum value of the second derivative of the conductivity through an LCD (liquid crystal display), and converting an oxidation stability numerical value of the sample to display on the LCD after the maximum value is stable.
Preferably, in step (1), the oil bath temperature is maintained at 180. + -. 1 ℃.
Preferably, in the step (2), the pressure in the test tube is monitored by a pressure gauge, and the air regulating valve is adjusted to maintain the air flow at 20 mm/h.
Preferably, in step (5), the specific calculation process of the second derivative of the conductivity curve is as follows:
if y ═ f (x), then the first derivative y ═ dy/dx ═ df (x)/dx;
second derivative y ″, dy'/dx ═ d (dy/dx)]/dx＝d2y/dx2＝d2f(x)/dx2。
Compared with the prior art, the utility model has the advantages that:
(1) the utility model discloses a survey process of device does, through high temperature heating biodiesel, and the gaseous leading-in beaker that contains distilled water that will produce, through the conductivity change of measuring liquid in the beaker, confirms its oxidation stability.
(2) The utility model discloses a device is sealed effectual, does not receive external environment's interference, and the measuring result is accurate and repeatability is good.
(3) The core of the device of the utility model is an STM32F101 single chip microcomputer adopting Cortex-M3 kernel, the power consumption is low, and the cost performance is high; the oxidation stability of the sample is determined by using the maximum value of the second derivative of the curve, and the measurement precision is higher; the microprocessor can directly output the measurement result after collecting and processing data, and the device is more intelligent.
(4) Utilize the utility model discloses a method that the device was measured compares with original weighing method, detects consuming time shorter, and efficiency is higher.
To sum up, the utility model discloses a technique such as oil bath heating, gaseous leading-in, conductivity record flex point are taken to the device, realize sample short-term test, can satisfy biodiesel oxidation stability survey demand, and the analysis time that significantly reduces improves analysis efficiency.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure of the device of the present invention;
reference numerals: 1. an air filter; 2. an air regulating valve; 3. a test tube; 4. a measuring cup; 5. a measuring electrode; 6. an oil bath device; 7. an input conduit; 8. a catheter I; 9. a conduit II; 10. a catheter III; 11. an output conduit; 12. a pressure gauge; 13. a biodiesel sample; 14. distilled water; 15. a microprocessor; 16. an LCD display.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the device for measuring oxidation stability of biodiesel comprises an air filter 1, an air regulating valve 2, a test tube 3, a measuring cup 4, a measuring electrode 5, an oil bath device 6, an input conduit 7, a conduit I8, a conduit II 9, a conduit III 10 and an output conduit 11.
The inlet end of said air filter is connected to a compressed air supply (not shown) via an inlet duct 7, and the outlet end is connected to the inlet end of the air control valve 2 via a duct I8. The compressed air conveyed in by the inlet conduit 7 is filtered by means of the air filter 1. And the air regulating valve 2 is provided with a pressure gauge 12 for regulating the air pressure in the guide test tube 3. The compressed air source device is a common laboratory compressed air source CDA; the air filter 1 is a compressed air filter of type F0070 produced by Depont energy-saving technology Co.
The top end of the test tube 3 is provided with a piston I (not shown in the figure) for sealing, the test tube 3 is inserted into a commercially available oil bath device 6, and the test tube 3 contains a biodiesel sample 13 to be tested. And silicone oil is adopted in the oil bath device 6 for heat conduction and is used for heating the biodiesel sample 13 to be detected in the test tube 3. One end of the conduit II 9 is communicated with the outlet end of the air regulating valve 2, and the other end of the conduit II 9 penetrates through the piston I and is inserted into the bottom of the biodiesel sample 13 in the test tube 3.
A piston II (not shown in the figure) for sealing is installed at the top end of the measuring cup 4, distilled water 14 is contained in the measuring cup 4, one end of the guide pipe III 10 just penetrates through the piston I to be inserted into the test tube 3, and the other end penetrates through the piston II to be inserted into the bottom of the distilled water 14 in the measuring cup 4. One end of the output conduit 11 just penetrates through the piston II to be inserted into the measuring cup 4, and the other end of the output conduit is arranged at a vent of a laboratory vent pipe to directly discharge waste gas.
The detection end of the measuring electrode 5 extends into the position below the liquid level of the distilled water 14 for collecting measuring data, the other end of the measuring electrode 5 extends out of the measuring cup 4 and is electrically connected with a microprocessor 15, and the output end of the microprocessor 15 is electrically connected with an LCD display 16. The measurement data collected by the measurement electrode 5 is analyzed and processed by the microprocessor 15, and then is output to the LCD 16 to display the measurement result. The measuring electrode 5 is a DJS-1C platinum black electrode produced by Hangzhou continent Biotechnology GmbH; the microprocessor 15 is an STM32F101 type 32-bit ARM core processor produced by ideological semiconductor; the LCD display 16 is a 2.42 inch 128 x 64 dot matrix OLED display screen produced by the etoh electronics technology.
The utility model discloses the measurement principle of device does:
heating a biodiesel sample 13 to be detected through a high-temperature oil bath, introducing volatile carboxylic acid gas generated in the oxidation process of the biodiesel sample 13 into a measuring cup 4 filled with distilled water 14, electrolyzing the volatile carboxylic acid in the measuring cup 4 to change the conductivity, collecting the conductivity of liquid in the measuring cup 4 in real time through a measuring electrode 5, calculating through a microprocessor 15, finding out the maximum value of a second derivative of a conductivity change curve, and determining the oxidation stability of the sample.
The utility model discloses a use method of device, including following step:
(1) the test tube was confirmed to be clean, the biodiesel sample 13 to be tested was poured into the test tube, and the test tube was placed in an oil bath 6 maintained at 180 ± 1 ℃.
(2) Air in the laboratory compressed air source CDA is led into the test tube through the air filter 1 and the air adjusting valve 2 provided with the pressure gauge, the pressure gauge is used for monitoring the air pressure in the test tube, and then the air adjusting valve 2 is adjusted, so that the air flow is kept at 20 mm/h.
(3) The test tube was connected to the measuring cup 4 through the conduit III 10 so that the carboxylic acid volatiles in the biodiesel sample 13 were introduced into the distilled water 14 in the measuring cup by the flowing air and the conduit III 10 was ensured to be completely inserted into the bottom of the distilled water 14 in the measuring cup 4.
(4) Ensuring that the sensing end of the measuring electrode 5 is placed in the distilled water 14 in the measuring cup 4.
(5) And starting the microprocessor 15, acquiring the conductivity of the liquid in the measuring cup 4 in real time through the measuring electrode 5, calculating a second derivative of the conductivity curve, displaying the conductivity curve, a real-time value of the second derivative of the conductivity and a maximum value of the second derivative of the conductivity by the LCD 16, and converting and displaying an oxidation stability numerical value of the sample after the maximum value is stable.
The specific calculation process of the second derivative of the conductivity curve is as follows:
if y ═ f (x), then the first derivative y ═ dy/dx ═ df (x)/dx;
second derivative y ″, dy'/dx ═ d (dy/dx)]/dx＝d2y/dx2＝d2f(x)/dx2。
The calculation is realized by an STM32F101 type 32-bit ARM core processor which is produced by an ideographic semiconductor.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (3)
1. A device for biodiesel oxidation stability measurement, its characterized in that: comprises an air filter, an air regulating valve, a test tube, a measuring cup, a measuring electrode, an oil bath device, a conduit I, a conduit II, a conduit III, an input conduit and an output conduit; the inlet end of the air filter is connected with a compressed air source device through an input conduit, and the outlet end of the air filter is communicated with the inlet end of the air regulating valve through a conduit I; the top end of the test tube is provided with a piston I, the test tube is inserted into an oil bath device, a biodiesel sample to be detected is contained in the test tube, one end of the guide tube II is communicated with the outlet end of the air regulating valve, and the other end of the guide tube II penetrates through the piston I and is inserted into the bottom of the biodiesel sample in the test tube; a piston II is installed at the top end of the measuring cup, distilled water is contained in the measuring cup, one end of the guide pipe III penetrates through the piston I and is inserted into the test tube, and the other end of the guide pipe III penetrates through the piston II and is inserted to the bottom of the distilled water in the measuring cup; one end of the output conduit is inserted into the measuring cup through the piston II, and the other end of the output conduit is communicated with the outside atmosphere; the detection end of the measuring electrode is inserted below the surface of the distilled water; the other end of the measuring electrode extends out of the measuring cup and is externally connected with a microprocessor, and the output end of the microprocessor is connected with an LCD display.
2. The apparatus for measuring oxidation stability of biodiesel according to claim 1, characterized in that: and a pressure gauge is installed on the air regulating valve.
3. The apparatus for measuring oxidation stability of biodiesel according to claim 1, characterized in that: the microprocessor adopts an STM32F101 singlechip with a Cortex-M3 inner core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921208439.8U CN210269693U (en) | 2019-07-29 | 2019-07-29 | Device for measuring oxidation stability of biodiesel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921208439.8U CN210269693U (en) | 2019-07-29 | 2019-07-29 | Device for measuring oxidation stability of biodiesel |
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| CN210269693U true CN210269693U (en) | 2020-04-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261443A (en) * | 2019-07-29 | 2019-09-20 | 青岛海关技术中心 | A kind of device and its application method for oxidation stability of biodiesel measurement |
| CN112649593A (en) * | 2020-11-23 | 2021-04-13 | 西安热工研究院有限公司 | Method for detecting oxidation stability of phosphate fire-resistant oil |
-
2019
- 2019-07-29 CN CN201921208439.8U patent/CN210269693U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261443A (en) * | 2019-07-29 | 2019-09-20 | 青岛海关技术中心 | A kind of device and its application method for oxidation stability of biodiesel measurement |
| CN112649593A (en) * | 2020-11-23 | 2021-04-13 | 西安热工研究院有限公司 | Method for detecting oxidation stability of phosphate fire-resistant oil |
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