Fatty acid methyl ester oxidation stability determination device

Abstract

The utility model discloses a fatty acid methyl ester oxidation stability measuring device, which comprises a device main body, a plurality of reaction tubes used for sample oxidation, each reaction tube is provided with an air inlet and an air outlet, and the air inlet of each reaction tube is provided with a first air inlet tube used for introducing oxygen or air flow into the reaction tube; each first gas inlet pipe is provided with a gas flow rate control device capable of controlling the flow rate of gas flow in the gas inlet pipe; according to the fatty acid methyl ester oxidation stability measuring device disclosed by the utility model, the gas inlet channels of the first gas inlet pipes are respectively provided with the flow speed control devices capable of controlling the gas flow speed of the gas inlet channels of the first gas inlet pipes, so that the gas inlet flow speed of the first gas inlet pipes can be accurately controlled; the method has high precision, high stability and good environmental adaptability, and can significantly improve the test efficiency of the fatty acid methyl ester oxidation stability test and the accuracy of the test result.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of biodiesel analysis device, concretely relates to a fatty acid methyl ester oxidation stability determination device. BACKGROUND

[0002] In recent years, the demand for renewable energy is growing, and biodiesel as a clean, renewable alternative fuel has been widely used worldwide. Fatty acid methyl ester, as an important component of biodiesel, its oxidation stability is a key factor affecting the quality of biodiesel, poor oxidation stability will lead to the production of sediment during fuel storage, thereby affecting the engine performance.

[0003] In order to detect the oxidation stability of biodiesel, the accelerated oxidation method is usually used for test (NB / SH / T0825); These tests need to accurately control the reaction conditions, including temperature and oxygen flow rate; Among them, the oxygen flow rate has a direct impact on the test results; Therefore, accurate measurement and control of gas flow are crucial to obtain reliable oxidation stability data.

[0004] At present, the fatty acid methyl ester oxidation stability determination device controls the air flow rate by the controllable flow rate gas diaphragm pump; In addition, the fatty acid methyl ester oxidation stability determination device can also be equipped with air filter and other components to further ensure the stability of the air quality and flow rate of the sample, the air filter can remove impurities and particles in the air to prevent them from interfering with the test results; But the gas diaphragm pump can not realize the precise control of flow, can only adjust the gas flow rate to 10L / h, has no digital display and can not adjust other gear flow rate, which causes inconvenience to the subsequent flow rate calibration; And the gas diaphragm pump can only pass through each gas channel in turn through the single pipeline in series, and can not realize the precise control of single channel. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of fatty acid methyl ester oxidation stability determination device, to realize the high-precision determination of fatty acid methyl ester oxidation stability, and it is easy to operate, can significantly improve fatty acid methyl ester oxidation stability determination test efficiency and the stability of test result.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A kind of fatty acid methyl ester oxidation stability determination device, comprising

[0008] Device main body, including multiple reaction tubes for sample oxidation, the reaction tube has gas inlet and gas outlet, the gas inlet of the reaction tube is equipped with the first gas inlet pipe for introducing oxygen or air flow into the reaction tube;

[0009] The gas flow rate control device is arranged on each first gas inlet pipe to control the gas flow rate in the gas inlet pipe.

[0010] Further, the gas flow rate control device on each first gas inlet pipe is independently controlled.

[0011] The gas flow rate control device on each first gas inlet pipe is independently controlled to selectively close the gas passage of the first gas inlet pipe according to the number of samples to be detected.

[0012] Further, the device body has a side plate, and the gas flow rate control device is fixed on the side plate and connected to the first gas inlet pipe through a connecting hose.

[0013] The gas flow rate control device is fixed on the side plate of the device body to facilitate the observation and control of the gas flow rate of each first gas inlet pipe.

[0014] Further, the gas flow rate control device comprises a gas flow meter, and a flow adjusting control member capable of being manually controlled is arranged at the inlet of the gas flow meter to adjust the gas flow rate by adjusting the cross-sectional area of the gas passage.

[0015] The gas flow rate of each first gas inlet pipe is observed through the gas flow meter, and the flow adjusting control member capable of being manually controlled is arranged at the inlet of the gas flow meter, so that the gas flow rate of each first gas inlet pipe can be accurately controlled manually without connecting a computer.

[0016] Further, the gas flow meter is a rotor flow meter, and the flow adjusting control member is an adjusting screw, which is arranged on the first gas inlet pipe at the inlet of the gas flow meter.

[0017] The adjusting screw is used as the flow adjusting control member, and the cross-sectional area of the gas passage of the first gas inlet pipe can be changed by adjusting the screw depth of the adjusting screw in the first gas inlet pipe, so as to change the gas flow rate in the first gas inlet pipe. The structure is simple, and the operation is simple and convenient.

[0018] Further, the device body further comprises a plurality of electrodes and measuring cells for collecting and analyzing volatile organic components generated in the oxidation reaction process of each reaction tube, and a plurality of heating systems for controlling the temperature of each reaction tube.

[0019] An exhaust pipe is arranged at the gas outlet of each reaction tube, and the other end of the exhaust pipe is connected to the measuring cell to introduce the gas generated in the oxidation reaction process in the reaction tube into the measuring cell.

[0020] Further, the fatty acid methyl ester oxidation stability determination device further comprises an air / oxygen source and a measuring recorder, the air / oxygen source is connected with each first air inlet pipe through a second air inlet pipe, and is used for air / oxygen supply of the reaction tube; the second air inlet pipe is provided with a gas filter and a gas diaphragm pump with a controllable flow rate; and the measuring recorder is connected with the electrode and is used for monitoring and recording the conductivity change of the solution in each measuring pool.

[0021] Further, the heating system comprises a heating unit arranged at the bottom of the reaction tube, and a temperature control device is arranged on the heating unit.

[0022] Further, the temperature control device is a silicon contact type thermometer.

[0023] The silicon contact type thermometer is used as the temperature control device of the heating unit, so that the temperature condition of the reaction tube can be accurately measured and controlled, and the accuracy and reliability of the test result are ensured.

[0024] Further, the measuring pool is provided with an exhaust pipe.

[0025] The exhaust pipe can timely exhaust the gas generated in the reaction, so that the test environment is kept clean and stable, the pressure balance in the measuring pool is maintained, the measuring pool is protected, and the test is ensured to be carried out smoothly.

[0026] Compared with the prior art, the device has at least the following beneficial effects:

[0027] The fatty acid methyl ester oxidation stability determination device can accurately control the flow rate of each first air inlet pipe by arranging the flow rate control device capable of controlling the flow rate of the first air inlet pipe on each first air inlet pipe, has high precision, high stability and good environmental adaptability, and can significantly improve the test efficiency and the accuracy of the test result of the fatty acid methyl ester oxidation stability test. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 is a structural schematic view of the fatty acid methyl ester oxidation stability determination device.

[0029] Figure 2 Fig. 2 is a left view schematic view of the fatty acid methyl ester oxidation stability determination device.

[0030] Figure 3 Fig. 3 is a working process schematic view of the fatty acid methyl ester oxidation stability determination device.

[0031] Figure 4 Fig. 4 is a structural schematic view of the flow rate control device.

[0032] In the figure: 10-air / oxygen source; 11-second air inlet pipe;

[0033] 20-gas filter

[0034] 30-gas diaphragm pump with controllable flow rate

[0035] 40-gas flow rate control device; 41-rotameter; 42-adjusting screw

[0036] 50-device main body; 51-reaction tube; 511-first gas inlet tube; 512-gas outlet tube; 513-side plate

[0037] 60-measuring cell; 61-electrode; 62-gas exhaust tube

[0038] 70-measuring recorder

[0039] 80-heating block; 81-silicon contact thermometer DETAILED DESCRIPTION

[0040] The utility model will be described in further detail below in combination with specific embodiments and examples. It should be understood that the following examples are only used to further illustrate the utility model and should not be understood as limiting the protection scope of the utility model. Some non-essential improvements and adjustments made by the professional technicians in the field according to the content of the utility model still belong to the protection scope of the utility model.

[0041] Referring to Figures 1-3 , the fatty acid methyl ester oxidation stability determination device of the utility model comprises

[0042] Device main body 50; referring to Figure 1, including a plurality of reaction tubes 51 for sample oxidation, a plurality of electrodes 61 and measuring cells 60 for collecting and analyzing volatile organic components generated during the oxidation reaction of each reaction tube 51, and a plurality of heating systems for controlling the temperature of each reaction tube 51; each reaction tube 51 has an air inlet and an air outlet, and the air inlet of each reaction tube 51 is provided with a first air inlet pipe 511 for introducing an oxygen or air flow into the reaction tube 51; each first air inlet pipe 511 is provided with a gas flow rate control device 40 capable of controlling the flow rate of the gas flow in the first air inlet pipe 511; the gas flow rate control device 40 includes a rotor flow meter 41 and an adjusting screw 42 arranged on the first air inlet pipe 511 and located at the inlet of the rotor flow meter 41; by adjusting the screw depth of the adjusting screw 42 in the first air inlet pipe 511, the cross-sectional area of the gas passage of the first air inlet pipe 511 can be changed, thereby changing the gas flow rate in the first air inlet pipe 511; the structure is simple, the operation is simple and convenient, and the adjusting screw 42 is used as a flow control component to manually and independently control the accurate control of the gas passage of each first air inlet pipe 511, selectively closing the gas flow of the gas pipeline without placing the sample, without connecting to the computer control, and the operation is simple; the air outlet of each reaction tube 51 is provided with an air outlet pipe 512, the other end of the air outlet pipe 512 is connected with the measuring cell 60, and the air outlet pipe 512 is used to introduce the gas generated in the oxidation reaction in the reaction tube 51 into the measuring cell 60; the measuring cell 60 is provided with an exhaust pipe 62, the exhaust pipe 62 can timely exhaust the reaction gas, maintain the cleanliness and stability of the test environment, and at the same time maintain the pressure balance inside the measuring cell 62, protect the measuring cell 62 and ensure the smooth progress of the test.

[0043] Continuing to refer to Figure 1 , the device body 50 has a side plate, the gas flow rate control device 40 is fixed on the side plate and connected to the first air inlet pipe 511 through a connecting hose, so as to facilitate the observation and control of the gas flow rate of each first air inlet pipe 511;

[0044] Continuing to refer to Figure 3 , the fatty acid methyl ester oxidation stability determination device further comprises an air / oxygen source 10 connected with each first air inlet pipe 511 through a second air inlet pipe 11 for air / oxygen supply of the reaction tube 51; the second air inlet pipe 11 is provided with a gas filter 20 and a controllable flow rate gas diaphragm pump 30;

[0045] The measuring recorder 70 is connected with the electrodes 61 in each measuring cell 60 for monitoring and recording the conductivity change of each measuring cell 60;

[0046] Continuing to refer to Figure 3 , the heating system includes a heating block 80 arranged at the bottom of the reaction tube 511 and a silicon contact type temperature meter 81 inserted into the heating block 80.

[0047] The utility model discate of fatty acid methyl ester oxidation stability measuring device concrete determination process is NB / SH / T 0825-2010 " fatty acid methyl ester oxidation stability determination accelerated oxidation method ".

[0048] Through the controllable flow rate gas diaphragm pump 30 and gas flow rate control device 40, the oxygen / air flow rate of each first air inlet pipe 511 is accurately adjusted, the single-channel accurate control of the air inlet flow rate of each first air inlet pipe 511 can be realized, has high precision, high stability and good environmental adaptability, can significantly improve the test efficiency and the accuracy of test results of fatty acid methyl ester oxidation stability test, and can selectively close the air inlet channel of the first air inlet pipe 511 without placing the sample, reduces the loss of the controllable flow rate gas diaphragm pump 30.

[0049] It should be noted that the gas flow meter of the utility model includes but is not limited to a rotor flow meter, and other types of gas flow meters can also achieve the effect of real-time monitoring of the gas flow rate in each first air inlet pipe 511 in the utility model; the temperature control device of the heating system includes but is not limited to a silicon-controlled contact thermometer 81, and other types of electronic temperature control elements can also be used; the connecting hose in the utility model is a gas guide pipe made of inert materials such as polytetrafluoroethylene or silicone and has soft texture.

[0050] In addition, it should be understood that, after reading the above teachings of the utility model, those skilled in the art can make various improvements or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims of the present application.

Claims

1. A device for measuring the oxidative stability of fatty acid methyl esters, comprising a device body comprising a plurality of reaction tubes for the oxidation of a sample, the reaction tubes having an air inlet and an air outlet, the air inlets of the reaction tubes being provided with first air inlets for introducing an oxygen or air flow into the reaction tubes; characterized in that a gas flow rate control device being provided on each first air inlet for controlling the flow rate of the gas flow in the air inlet.

2. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 1, characterized by, The gas flow rate control devices on each first air inlet are independently controlled.

3. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 1, characterized by, The device body has a side plate, and the gas flow rate control devices are fixed on the side plate and connected to the first air inlets through connecting hoses.

4. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 1, characterized by, The gas flow rate control device comprises a gas flow meter, and the gas flow meter is provided with a flow adjustment control member at the inlet thereof, which is manually controlled and adjusts the flow rate of the gas flow by adjusting the cross-sectional area of the gas passage.

5. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 4, wherein, The gas flow meter is a rotameter, and the flow adjustment control member is an adjusting screw, which is located on the first air inlet at the inlet of the gas flow meter.

6. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 1, wherein, The device body further comprises a plurality of electrodes and measuring cells for collecting and analyzing volatile organic components generated during the oxidation reaction of each reaction tube, and a plurality of heating systems for controlling the temperature of each reaction tube; Each reaction tube is provided with an air outlet at the air outlet thereof, and the other end of the air outlet is connected to a measuring cell for introducing the gas generated during the oxidation reaction in the reaction tube into the measuring cell.

7. The fatty acid methyl ester oxidation stability measurement apparatus according to claim 6, wherein, The device for measuring the oxidative stability of fatty acid methyl esters further comprises an air / oxygen source and a measuring recorder, the air / oxygen source is connected to each first air inlet through a second air inlet for air / oxygen supply of the reaction tube, the second air inlet is provided with a gas filter and a controllable flow rate gas diaphragm pump, and the measuring recorder is connected to the electrodes for monitoring and recording the changes in the electrical conductivity of the solution in each measuring cell.

8. The fatty acid methyl ester oxidation stability measurement apparatus of claim 6, wherein, The heating system comprises a heating unit arranged at the bottom of the reaction tube, and the heating unit is provided with a temperature control device.

9. The fatty acid methyl ester oxidation stability measurement apparatus of claim 8, wherein, The temperature control device is a silicon-controlled contact thermometer.

10. The fatty acid methyl ester oxidation stability measurement apparatus of claim 6, wherein, An exhaust pipe is provided on the measuring cell.

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