A measurement system and method for liquid mixed fuel oxidation characteristic parameters

Abstract

The present invention discloses a system and method for measuring the oxidation characteristic parameters of a liquid mixed fuel, including a fuel mixing system, a heating furnace, a temperature control system, a gas control system, and a quality monitoring system. The fuel mixing system includes an ultrasonic oscillating mixer and a metering pump. The heating furnace includes a furnace tube, a furnace body, a furnace body flange, a gas outlet, a cooling water jacket, and a sample pipe. The temperature control system includes an electric heating wire, a sample thermocouple, a furnace temperature thermocouple, a program temperature controller, and a cooler. The gas control system includes a protective gas and a reaction gas intake pipe, a mass flow meter, and a flow controller. The quality detection system includes an electronic balance, a sample tray, a differential transformer, and a recording system. The device of the present invention can measure the thermogravimetric curve (TG) and the derivative thermogravimetric curve (DTG) of the liquid mixed fuel, and use the Coats-Redfern integration method to calculate the oxidation characteristic parameters of the liquid mixed fuel, which can promote the use of clean and efficient internal combustion engine substitute fuel.

Description

Technical Field

[0001] The invention relates to a liquid fuel heating analysis device, in particular to a measurement system and method for liquid mixed fuel oxidation characteristic parameters. Background Art

[0002] Under the dual pressure of energy crisis and increasingly severe environmental problems, the development of new clean and efficient alternative fuels has become an inevitable trend. After the promulgation of the National VI emission regulations for engines, the particulate matter number (Particulate Number) limit was added, which means that the control of pollutant emissions in the cylinder of internal combustion engines has entered a new stage. A large number of scholars have shown that an important factor affecting the combustion and emissions of internal combustion engines is the physical and chemical properties of fuel. The characterization method of the physical and chemical properties of traditional fuels can measure octane number, cetane number, calorific value, latent heat of vaporization, viscosity, etc., but the measurement method of characterizing the characteristic parameters of fuel oxidation is cumbersome and costly.

[0003] Thermogravimetric analysis refers to the relationship between the mass and temperature of the test sample under different atmospheres, with the heating temperature controlled by programmed temperature rise. It is widely used in physics, chemical industry, materials, fuel, textile and other fields, and can achieve component analysis, material identification, and measurement of thermal parameters and kinetic parameters. Through thermogravimetric analysis, the thermogravimetric curve (TG) and the differential thermogravimetric curve (DTG) are obtained, and the pre-exponential factor A and activation energy E of the liquid mixed fuel are calculated by the Coats-Redfern integral method, which greatly promotes the promotion and application of new clean and efficient internal combustion engine alternative fuels. Summary of the invention

[0004] The purpose of the present invention is to couple the thermogravimetric analysis method with the Coats-Redfern integration method to measure the oxidation characteristic parameters of liquid mixed fuel, thereby solving the defects of the traditional fuel physical and chemical property characterization method, which is cumbersome and costly. The technical scheme for implementing the present invention is as follows:

[0005] After the different fuels are fully mixed in the ultrasonic oscillation mixer, the mixed fuel is pumped into the sampling pipe by a metering pump and then added to the sample tray. The temperature control system heats the sample programmatically, and the quality monitoring system monitors and records the mass change. After the experiment, the TG curve and DTG curve are obtained from the recording system, and the Coats-Redfern integration method is used to calculate the pre-exponential factor A and activation energy E.

[0006] A measurement system for liquid mixed fuel oxidation characteristic parameters, comprising a fuel mixing system, a heating furnace, a temperature control system, a gas control system and a quality monitoring system;

[0007] The fuel mixing system mixes the fuel and transports it to the heating furnace through a pipeline for heating and combustion. The temperature control system is used to control the temperature in the heating furnace. The gas control system is used to provide protective gas and reaction gas. The quality detection system is used to detect the combustion of the fuel in the heating furnace.

[0008] The fuel mixing system includes an ultrasonic oscillating mixer and a metering pump; the ultrasonic oscillating mixer inputs the mixed fuel into the metering pump through a pipeline;

[0009] The heating furnace comprises a furnace tube, a furnace seat, a furnace body, a furnace body flange, a gas outlet, a gas outlet valve, a cooling water jacket and a layout pipeline;

[0010] A gas outlet is provided at one end of the furnace tube, and the opening and closing of the gas outlet is controlled by a gas outlet valve. The other end of the furnace tube is arranged on the furnace body flange. The furnace body and the furnace body flange form a closed space, and the furnace tube is placed in the closed space. A cooling water jacket is arranged on the furnace body.

[0011] An electric heating wire is arranged in the furnace tube, one end of the sample laying pipeline is connected with the quantitative pump, and the other end extends into the furnace tube;

[0012] The gas control system comprises a protective gas inlet pipeline and a reaction gas inlet pipeline; the gas inlet pipeline and the reaction gas inlet pipeline extend into the furnace tube;

[0013] The quality detection system comprises an electronic balance, a sample tray, a differential transformer and a recording system; the sample tray is arranged on the electronic balance, the differential transformer is connected to the electronic balance, and the recording system can record changes in sample quality.

[0014] Furthermore, the protective gas inlet pipeline and the reaction gas inlet pipeline extend into the furnace tube to different lengths, and the reaction gas inlet pipeline is placed at an obliquely upper position of the sample tray.

[0015] Furthermore, the gas control system also includes a protective gas cylinder and a reaction gas cylinder, a mass flow meter and a flow controller; the protective gas cylinder is used to provide protective gas, the reaction gas cylinder is used to provide reaction gas, the mass flow meter is used to record the gas flow of the protective gas cylinder and the reaction gas cylinder flowing into the protective gas inlet pipe and the reaction gas inlet pipe, and the flow controller is used to control the mass flow meter.

[0016] Furthermore, the cooling water jacket is provided with a coolant inlet and a coolant outlet, and the coolant enters through the coolant inlet and flows out from the coolant outlet.

[0017] Furthermore, the temperature control system includes a sample thermocouple, a furnace temperature thermocouple and a program temperature controller; the furnace temperature thermocouple is arranged inside the furnace body to detect the temperature inside the furnace body, the sample thermocouple is placed near the sample tray to detect the temperature of the sample, and the program temperature controller is connected to the electric heating wire, and the program temperature controller controls the isothermal or non-isothermal heating of the electric heating wire.

[0018] Furthermore, the furnace body flange is arranged on the furnace base, and a circular hole is opened at the center position of the furnace body flange, an inner sealing baffle and an outer sealing baffle are arranged in the circular hole, and a sealing ring is arranged between the inner sealing baffle and the outer sealing baffle, the protective gas inlet pipe and the reaction gas inlet pipe pass through the inner sealing baffle and the outer sealing baffle to enter the furnace tube, and the outlet of the protective gas inlet pipe is close to the inner sealing baffle.

[0019] Furthermore, the program temperature controller is also used to control the temperature of the coolant in the cooling water jacket, thereby achieving control of the furnace body temperature.

[0020] The measuring method of the liquid mixed fuel oxidation characteristic parameter measuring system comprises the following steps:

[0021] Step 1: Fuel A and fuel B are mixed by oscillation in an ultrasonic oscillating mixer to ensure that the fuels are fully mixed;

[0022] Step 2: The mixed fuel is pumped into the sample pipe through a quantitative pump and then added to the sample plate inside the furnace tube. The temperature control system controls the electric heating wire to heat according to the set temperature. The quality monitoring system monitors the change of sample quality. The gas control system pyrolyzes the sample in a specific atmosphere and removes the waste gas in time.

[0023] Step 3, outputting the TG curve and DTG curve from the recording system;

[0024] Step 4: Calculate the oxidation characteristic parameters of the mixed fuel using the TG curve and the DTG curve combined with the Coats-Redfern integration method.

[0025] Beneficial effects of the present invention:

[0026] 1. The present invention provides a method and system for measuring the oxidation characteristic parameters of a liquid mixed fuel, which can analyze the oxidation characteristics of the liquid mixed fuel in a specific atmosphere at a specific heating rate, and can use the Coats-Redfern integration method to simply and quickly calculate the pre-exponential factor A and activation energy E of the mixed fuel.

[0027] 2. The present invention improves the measurement accuracy of the electronic balance, designs temperature compensation and carrier gas correction, and reduces the problem of electronic balance shaking caused by gas flow.

[0028] 3. The sample placement pipeline designed in the present invention solves the shortcomings of cumbersome sample placement and easy damage to the sample plate in the traditional oxidation characteristic parameter measurement process, simplifies the test process and reduces the difficulty of operation.

[0029] 4. The gas outlet and gas outlet valve designed in the present invention can realize the collection of fuel oxidation products, and other gas analysis instruments (such as infrared spectrometer) can be connected after the gas outlet to further analyze the fuel oxidation products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the overall operation flow chart of the present invention.

[0031] Figure 2 It is a schematic diagram of the overall structure of the heating furnace of the present invention.

[0032] Figure 3 It is a left side view of the furnace flange of the present invention.

[0033] Figure 4 It is a flow chart of the control system of the present invention.

[0034] Figure 5 The TG curve and DTG curve of PODE / diesel mixed fuel obtained from the recording system.

[0035] Figure 6 It is the thermal characteristic curve of PODE / diesel mixed fuel calculated by Coats-Redfern method.

[0036] The markings in the figure are:

[0037] 1-protective gas cylinder and reaction gas cylinder, 2-locking nut, 3-mass flowmeter, 4-coolant inlet, 5-flow controller, 6-furnace flange, 7-furnace tube, 8-protective gas inlet pipe, 9-reaction gas inlet pipe, 10-furnace base, 11-differential transformer, 12-recording system, 13-electronic balance, 14-outer sealing baffle, 15-sealing ring, 16-inner sealing baffle, 17-electric heating wire, 18-cooling outlet, 19-cooler, 20-programmed temperature controller, 21-furnace body, 22-furnace temperature thermocouple, 23-sample thermocouple, 24-cooling water jacket, 25-sample tray, 26-gas outlet, 27-gas outlet valve, 28-ultrasonic oscillation mixer, 29-quantitative pump, 30-sampling pipeline. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The following first describes in detail the embodiments of the present invention with reference to the accompanying drawings.

[0042] A measurement system for liquid mixed fuel oxidation characteristic parameters, comprising a fuel mixing system, a heating furnace, a temperature control system, a gas control system and a quality monitoring system;

[0043] The fuel mixing system mixes the fuel and transports it to the heating furnace through a pipeline for heating and combustion. The temperature control system is used to control the temperature in the heating furnace. The gas control system is used to provide protective gas and reaction gas. The quality detection system is used to detect the combustion of the fuel in the heating furnace.

[0044] The fuel mixing system includes an ultrasonic oscillating mixer 28 and a metering pump 29; the ultrasonic oscillating mixer 28 inputs the mixed fuel into the metering pump 29 through a pipeline;

[0045] The heating furnace comprises a furnace tube 7, a furnace seat 10, a furnace body 21, a furnace body flange 6, a gas outlet 26, a gas outlet valve 27, a cooling water jacket 24 and a layout pipeline 30;

[0046] A gas outlet 26 is provided at one end of the furnace tube 7, and the opening and closing of the gas outlet 26 is controlled by a gas outlet valve 27. The other end of the furnace tube 7 is arranged on the furnace body flange 6. The furnace body 21 and the furnace body flange 6 form a closed space, and the furnace tube 7 is placed in the closed space. A cooling water jacket 24 is provided on the furnace body 21.

[0047] The furnace tube 7 is provided with an electric heating wire 17, one end of the sample laying pipeline 30 is connected with the metering pump 29, and the other end extends into the furnace tube 7;

[0048] The gas control system comprises a protective gas inlet pipeline 8 and a reaction gas inlet pipeline 9; the gas inlet pipeline 8 and the reaction gas inlet pipeline 9 extend into the furnace tube 7;

[0049] The quality detection system includes an electronic balance 13, a sample tray 25, a differential transformer 11 and a recording system 12; the sample tray 25 is arranged on the electronic balance 13, the differential transformer 11 is connected to the electronic balance 13, and the recording system 12 can record changes in sample quality.

[0050] The protective gas inlet pipe 8 and the reaction gas inlet pipe 9 extend into the furnace tube 7 to different lengths, and the reaction gas inlet pipe 9 is placed at an obliquely upper position of the sample tray 25 .

[0051] The gas control system also includes a protective gas cylinder and a reaction gas cylinder 1, a mass flow meter 3 and a flow controller 5; the protective gas cylinder is used to provide protective gas, the reaction gas cylinder 1 is used to provide reaction gas, the mass flow meter 3 is used to record the gas flow of the protective gas cylinder and the reaction gas cylinder 1 flowing into the protective gas inlet pipe 8 and the reaction gas inlet pipe 9, and the flow controller 5 is used to control the mass flow meter 3.

[0052] The cooling water jacket 24 is provided with a coolant inlet 4 and a coolant outlet 18 . The coolant enters through the coolant inlet 4 and flows out from the coolant outlet 18 .

[0053] The temperature control system includes a sample thermocouple 23, a furnace temperature thermocouple 22 and a program temperature controller 20; the furnace temperature thermocouple 23 is arranged on the inner side of the furnace body 21 to detect the temperature inside the furnace body 21, the sample thermocouple 22 is placed near the sample tray 25 to detect the temperature of the sample, and the program temperature controller 20 is connected to the electric heating wire 17, and the program temperature controller 20 controls the isothermal or non-isothermal heating of the electric heating wire 17.

[0054] The furnace body flange 6 is arranged on the furnace base 10, and a circular hole is opened at the center position of the furnace body flange 6. An inner sealing baffle 16 and an outer sealing baffle 14 are arranged in the circular hole, and a sealing ring 15 is arranged between the inner sealing baffle 16 and the outer sealing baffle 14. The protective gas inlet pipe 8 and the reaction gas inlet pipe 9 pass through the inner sealing baffle 16 and the outer sealing baffle 14 to enter the furnace tube 7, and the outlet of the protective gas inlet pipe 8 is close to the inner sealing baffle 15.

[0055] The programmable temperature controller 20 is also used to control the temperature of the coolant in the cooling water jacket 24 , thereby achieving control of the temperature of the furnace body 21 .

[0056] The electric heating wire 17 is filled with glass fiber.

[0057] The furnace flange 6 is provided with an inner sealing baffle 16, a sealing ring 15, and an outer sealing baffle 14; the furnace base 10 is provided with a differential transformer 12;

[0058] The temperature control system includes an electric heating wire 17, a sample thermocouple 23, a furnace temperature thermocouple 22, a program temperature controller 20, a cooler 19, a coolant inlet 4, a coolant outlet 18, and a cooling water jacket 24. The program temperature controller 20 receives electrical signals from the furnace temperature thermocouple 22 and the sample thermocouple 23, and controls the cooler 19;

[0059] The inner wall of the furnace tube 7 is provided with an electric heating wire 17 , which can be controlled by a program temperature controller 20 to achieve isothermal or non-isothermal heating.

[0060] The furnace body 21 and the furnace body flange 6 are fixed together by bolts. A cooling water jacket 24 is embedded in the furnace body 21. The coolant cools the furnace body under the control of the program temperature controller 20. A sealing ring 15 is sealed between the inner sealing baffle 16 and the outer sealing baffle 14. An air intake pipe is arranged in the sealing ring 15. The reaction gas intake pipe 9 passes the reaction gas into the rear of the sample tray 25, and the protective gas intake pipe 8 passes the protective gas into the furnace tube 7.

[0061] The end of the electronic balance 13 is connected to the differential transformer 11, and the recording system 12 can record the change in sample mass.

[0062] The sample thermocouple 23 is connected to the sample tray 25, and the furnace temperature thermocouple 22 is fixed on the inner wall of the furnace body 21. The program temperature controller 20 changes the current on the electric heating wire 17 and the flow rate of the coolant through the temperature signal monitored by the thermocouple to control the sample temperature and the furnace body temperature.

[0063] The overall operation process of the present invention is as follows: Figure 1 As shown;

[0064] Step 1: Fuel A and fuel B are mixed by oscillation in an ultrasonic oscillating mixer 28 to ensure that the fuels are fully mixed;

[0065] Step 2: The mixed fuel is pumped into the sample pipe 30 through the metering pump 29, and then added to the sample tray 25 inside the furnace tube 7. The temperature control system controls the electric heating wire 17 to heat according to the set temperature, the quality monitoring system monitors the change of sample quality, and the gas control system pyrolyzes the sample in a specific atmosphere and removes the exhaust gas in time.

[0066] Step 3, outputting the TG curve and the DTG curve from the recording system 12;

[0067] Step 4: Calculate the oxidation characteristic parameters of the mixed fuel using the TG curve and the DTG curve combined with the Coats-Redfern integration method.

[0068] like Figure 2 As shown, a method and device for measuring the oxidation characteristic parameters of a liquid mixed fuel include a fuel mixing system, a heating furnace, a temperature control system, a gas control system, and a quality monitoring system, wherein:

[0069] The fuel mixing system includes an ultrasonic oscillating mixer 28 and a metering pump 29;

[0070] The heating furnace comprises a furnace tube 7, a furnace seat 10, a furnace body 21, a furnace body flange 6, a gas outlet 26, a gas outlet valve 27, a cooling water jacket 24, a locking nut 2, and a lofting pipeline 30. The furnace body flange 6 is provided with an inner sealing baffle 16, an outer sealing baffle 14, and a sealing ring 15. The furnace seat 10 is provided with a differential transformer 11, and the furnace body 21 is embedded with a cooling water jacket 24.

[0071] The temperature control system includes an electric heating wire 17, a furnace temperature thermocouple 22, a sample thermocouple 23, a program temperature controller 20, a cooler 19, a coolant inlet 4, and a coolant outlet 18. The cooler 19 is connected to the coolant inlet 4 through a pipeline, and the inner wall of the furnace tube 7 is provided with an electric heating wire 17 to heat the sample;

[0072] The gas control system comprises a reaction gas cylinder and a protective gas cylinder 1, a protective gas inlet pipeline 8, a reaction gas inlet pipeline 9, a mass flow meter 3, and a flow controller 5;

[0073] The quality monitoring system includes an electronic balance 13, a sample tray 25, a differential transformer 11, and a recording system 12. The end of the electronic balance 13 is connected to the differential transformer 11. The recording system 12 can record the quality change of the sample and output a TG curve and a DTG curve.

[0074] like Figure 4As shown, the electronic balance 13 is connected to the differential transformer 11, and the electrical signals of temperature compensation, carrier gas correction and differential transformer 11 are transmitted to the digital-to-analog conversion module after being processed by the amplifier, and finally received and processed by the computer; the electrical signal measured by the sample thermocouple 23 is connected to the computer after being processed by the deviation amplifier, and the electrical signal processed by the deviation amplifier is connected to the PID controller, and the PID controller controls the program temperature controller 20 according to the heating rate set by the computer to adjust the heating power and the operation of the cooler 19; the flow controller 5 controls the opening of the mass flowmeter 3 according to the set gas flow rate, and passes the protective gas and the reaction gas into the furnace tube 7.

[0075] The oxygen in the PODE polyoxymethylene dimethyl ether molecule plays a role of self-oxygen supply during the combustion process, which is of great benefit to improving the combustion and emission characteristics of diesel engines. Using PODE as a component to optimize the performance of diesel fuel is a new research trend. The following will introduce the test process of the oxidation characteristic parameters of PODE / diesel mixed fuel in the invented device.

[0076] Step 1: PODE and diesel are mixed into a mixed fuel in a certain ratio, and the volume fraction of PODE in the mixed fuel is 0%, 10%, 20%, and 30%, which are recorded as P0, P10, P20, and P30. The prepared fuel is placed in an ultrasonic oscillating mixer 28 and oscillated at a frequency of 40 kHz for 10 minutes.

[0077] Step 2, start the metering pump 29, set the sample mass to 2mg, the metering pump 29 pumps the fully mixed fuel into the sample pipe 30, and finally puts the 2mg sample into the sample tray 25; after the sample is finished, close the metering pump 29 and open the gas outlet valve 27. In the computer control panel, enter the heating rate of 10K / min and the heating range of 40-400℃; the reaction gas is N280%+O220%, the reaction gas flow rate is 50mL / min, the protective gas is pure N2, and the protective gas flow rate is 50mL / min. The flow controller 5 adjusts the opening of the mass flowmeter 3 according to the set flow rate, and passes the protective gas and the reaction gas into the furnace tube 7 at a constant flow rate. After the reading of the electronic balance 13 is stable, the electronic balance 13 is zeroed, and carrier gas correction and temperature compensation are performed; the program temperature controller 20 is started, and the sample thermocouple 23 feeds back the sample temperature to the program temperature controller 20 in real time, and the program temperature controller 20 adjusts the current passed into the electric heating wire 17 so that the sample is heated according to the set heating rate; the furnace temperature thermocouple 22 feeds back the temperature of the furnace body 21 to the program temperature controller 20, and the cooler 19 automatically adjusts the flow rate of the cooling water under the control of the program temperature controller 20 to control the furnace body 21 at a constant temperature.

[0078] Step 3: The quality monitoring system automatically records the changes in sample quality, and obtains the TG curve and DTG curve from the recording system 12, such as Figure 5As shown; after the experiment, close the gas outlet valve 27.

[0079] Step 4: According to the TG curve and DTG curve, the pre-exponential factor A and activation energy E are calculated by combining the Coats-Redfern integration method. The equations are as follows:

[0080]

[0081] Wherein, a is the conversion rate (%); T is the thermodynamic temperature (K); A is the pre-exponential factor; b is the heating rate (K / min); E is the activation energy (J / mol); and R is the gas constant.

[0082] by right Plotting, through linear fitting, we can get the slope of the straight line as The intercept is A straight line, such as Figure 6 As shown, the activation energy E can be obtained by the slope of the straight line, and the pre-exponential factor A can be obtained by substituting it into formula 1. The results are shown in Table 1:

[0083]

[0084] Table 1: Regression equation, activation energy and pre-exponential factor of PODE / diesel blends.

[0085] from Figure 5 Analysis shows that from the TG curve, as the PODE blending ratio increases, the initial weight loss temperature and the final weight loss temperature of the sample decrease, indicating that the addition of PODE reduces the thermal stability of the fuel; from the DTG curve, it can be seen that as the PODE blending ratio increases, the weight loss rate curve of the fuel sample shifts to the low temperature area, and the weight loss rate peak temperature gradually decreases. The weight loss rate peak temperatures of the P10, P20 and P30 fuel samples are 13.3℃, ​​24.6℃ and 42.6℃ lower than that of P0, respectively, indicating that the thermal volatility of the mixed fuel is significantly better than that of diesel. The activation energy E and pre-exponential factor A of the mixed fuel gradually decrease with the increase of the PODE blending ratio, indicating that the addition of PODE improves the oxidation activity of the fuel, is conducive to the occurrence of oxidation reactions, and improves the combustion performance of diesel engines.

[0086] From Table 1, we can see that the linear regression coefficient R 2 All of them are greater than 0.98, and the fitting degree is ideal, which indicates that the device of the invention can measure the oxidation characteristics of the mixed fuel in a specific reaction gas and at a specific heating rate, and can quickly and easily calculate the oxidation characteristic parameters of the mixed fuel.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A system for measuring characteristic parameters of liquid mixed fuel oxidation, characterized in that: Including fuel mixing system, heating furnace, temperature control system, gas control system and quality monitoring system; The fuel mixing system mixes the fuel and then transports it to the heating furnace through a pipeline for heating and combustion. The temperature control system is used to control the temperature in the heating furnace. The gas control system is used to provide protective gas and reaction gas. The quality detection system is used to record the quality changes of the fuel in the heating furnace. The fuel mixing system comprises an ultrasonic oscillation mixer (28) and a metering pump (29); the ultrasonic oscillation mixer (28) inputs the mixed fuel into the metering pump (29) through a pipeline; The heating furnace comprises a furnace tube (7), a furnace body (21), a furnace body flange (6), a gas outlet (26), a gas outlet valve (27), a cooling water jacket (24) and a layout pipeline (30); A gas outlet (26) is provided at one end of the furnace tube (7), and the opening and closing of the gas outlet (26) is controlled by a gas outlet valve (27); the other end of the furnace tube (7) is connected to the furnace body flange (6) by means of a thread; the furnace body (21) and the furnace body flange (6) form a closed space, and the furnace tube (7) is placed in the closed space; a cooling water jacket (24) is provided on the furnace body (21); The cooling water jacket (24) is provided with a coolant inlet (4) and a coolant outlet (18), and the coolant enters through the coolant inlet (4) and flows out from the coolant outlet (18); An electric heating wire (17) is arranged in the furnace tube (7); one end of the sample laying pipeline (30) is connected to the quantitative pump (29), and the other end extends into the furnace tube (7); The gas control system comprises a protective gas inlet pipeline (8) and a reaction gas inlet pipeline (9); the gas inlet pipeline (8) and the reaction gas inlet pipeline (9) extend into the furnace tube (7); the protective gas inlet pipeline (8) and the reaction gas inlet pipeline (9) extend into the furnace tube (7) to different lengths, and the reaction gas inlet pipeline (9) is placed at an obliquely upper position of the sample tray (25); The mass detection system comprises an electronic balance (13), a sample tray (25), a differential transformer (11) and a recording system (12); the sample tray (25) is arranged on the electronic balance (13), the differential transformer (11) is connected to the electronic balance (13), and the recording system (12) can record changes in sample mass.

2. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 1, characterized in that: The gas control system further comprises a protective gas cylinder, a reaction gas cylinder (1), a mass flow meter (3) and a flow controller (5); the protective gas cylinder is used to provide protective gas, the reaction gas cylinder (1) is used to provide reaction gas, the mass flow meter (3) is used to record the gas flow of the protective gas cylinder and the reaction gas cylinder (1) flowing into the protective gas inlet pipeline (8) and the reaction gas inlet pipeline (9), and the flow controller (5) is used to control the mass flow meter (3).

3. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 1, characterized in that: The temperature control system comprises a sample thermocouple (23), a furnace temperature thermocouple (22) and a program temperature controller (20); the furnace temperature thermocouple (22) is arranged inside the furnace body (21) to detect the temperature inside the furnace body (21); the sample thermocouple (23) is arranged near the sample tray (25) to detect the temperature of the sample; the program temperature controller (20) is connected to the electric heating wire (17); the program temperature controller (20) controls the electric heating wire (17) to achieve isothermal or non-isothermal heating.

4. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 1, characterized in that: The furnace body flange (6) is arranged on the furnace base (10), and a circular hole is opened at the center of the furnace body flange (6). An inner sealing baffle (16) and an outer sealing baffle (14) are arranged in the circular hole, and a sealing ring (15) is arranged between the inner sealing baffle (16) and the outer sealing baffle (14). The protective gas inlet pipeline (8) and the reaction gas inlet pipeline (9) pass through the inner sealing baffle (16) and the outer sealing baffle (14) to enter the furnace tube (7), and the gas outlet of the protective gas inlet pipeline (8) is close to the inner sealing baffle (16).

5. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 3, characterized in that: The programmable temperature controller (20) is also used to control the temperature of the coolant in the cooling water jacket (24), thereby achieving control of the temperature of the furnace body (21).

6. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 1, characterized in that: The electric heating wire (17) is filled with glass fibers.

7. The liquid mixed fuel oxidation characteristic parameter measurement system according to claim 1, characterized in that: The electric heating wire (17) is filled with glass fibers.

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