Liquid fuel component calibration method and system based on ideal gas state equation

Abstract

This invention relates to a method and system for calibrating liquid fuel components based on the ideal gas equation of state, belonging to the field of fuel analysis technology. Its key features include the following steps: Step a, monitoring and recording the mass flow rate and mass of the liquid fuel, as well as the mass flow rate of the auxiliary gas; Step b, obtaining the mixed gas; Step c, recording the total flow rate of the mixed gas; Step d, obtaining the total number of moles in the mixed gas; Step e, calculating the number of moles of liquid fuel in the mixed gas; Steps f-g, constructing a linear relationship model and determining the molar mass of the liquid fuel; Step h, calculating the components of the liquid fuel. This calibration system for liquid fuel components based on the ideal gas equation of state organically combines the functions of a liquid flow meter and a gas calibration flow meter. Through the application of the ideal gas equation of state, it achieves effective calibration of the molar mass and chemical composition of complex liquid fuels.

Description

Technical Field

[0001] The method and system for calibrating liquid fuel components based on the ideal gas law belong to the field of fuel analysis technology. Background Technology

[0002] In energy utilization and chemical production processes, accurately understanding the chemical composition and molar mass of liquid fuels is crucial, as it directly affects combustion efficiency, environmental impact, and the design of subsequent processing techniques. However, liquid fuels are often composed of a variety of complex hydrocarbons and other compounds, with diverse components and varying proportions, making accurate calibration a technical challenge.

[0003] Traditional methods for analyzing the components of liquid fuels mainly rely on complex chemical analysis techniques, such as (1) chromatographic analysis (see the "Determination of Oxygen-Containing Compounds in Gasoline" mentioned in the People's Republic of China Petroleum and Chemical Industry Standard SH / T0720-2002). (2) mass spectrometry (see the method described in the literature "Qualitative and Quantitative Analysis of Catalytic Cracking Gasoline by Two-Dimensional Gas Chromatography-Time-of-Flight Mass Spectrometry"). Although these methods can accurately analyze the components of liquid fuels, they are cumbersome to operate, time-consuming, and somewhat destructive to the samples, which is not conducive to the need for rapid and continuous monitoring. In addition, these methods often focus on the analysis of single components and are difficult to comprehensively reflect the overall chemical composition of the fuel. This directly affects the setting of combustion parameters and the optimization of combustion efficiency. Therefore, designing a technical solution that can accurately calibrate the components of liquid fuels has become an urgent problem to be solved in this field. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a liquid fuel component calibration method and system based on the ideal gas equation of state, which organically combines the functions of a liquid flow meter and a gas calibration flow meter and realizes the effective calibration of the molar mass and chemical composition of complex liquid fuels through the application of the ideal gas equation of state.

[0005] The technical solution adopted by this invention to solve its technical problem is: a liquid fuel component calibration method based on the ideal gas law, characterized by comprising the following steps:

[0006] Step a: Monitor and record the mass flow rate and mass of the liquid fuel at any given time. m Fuel And the mass flow rate of the auxiliary gas;

[0007] Step b involves mixing the liquid fuel with the auxiliary gas and then vaporizing it to obtain a mixed gas.

[0008] Step c, record the total flow rate of the mixed gas.Q Flow-sum ;

[0009] Step d: Apply the ideal gas law to calculate the total flow rate of the mixed gas. Q Flow-sum Convert to the corresponding total number of moles n sum ;

[0010] Step e: Calculate the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel and the number of moles n Fuel As a data point;

[0011] Step f involves repeatedly executing steps a through e to obtain several data points at different times.

[0012] Step g, based on all data points, construct m Fuel and n Fuel A linear relationship model between them was established, and the molar mass of the liquid fuel was obtained using the linear relationship model.

[0013] Step h calculates the composition of the liquid fuel.

[0014] Preferably, in step g, the molar mass of the liquid fuel is obtained based on the slope of the linear relationship model.

[0015] Preferably, in step g, a linear relationship model is constructed using the least squares method.

[0016] Preferably, in step e, the sum of the number of moles is... n sum Subtract the known number of moles of nitrogen from n N2 This gives the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel .

[0017] Preferably, in step a, the auxiliary gas is nitrogen.

[0018] A liquid fuel component calibration system based on the ideal gas law is characterized by comprising a gas storage tank for holding auxiliary gas and a liquid storage tank for holding liquid fuel. The gas storage tank is connected to a gas mass flow controller, and the gas storage tank is also connected to the liquid storage tank. The outlet of the liquid storage tank is connected to a liquid flow controller. The outlets of the gas mass flow controller and the liquid flow controller are simultaneously connected to a controllable evaporator mixer, and the controllable evaporator mixer is connected to a gas flow meter.

[0019] Preferably, a first valve is provided between the gas storage cylinder and the liquid storage cylinder, and a second valve is provided between the liquid storage tank and the liquid mass flow controller.

[0020] Compared with the prior art, the beneficial effects of this invention are:

[0021] In this calibration system based on the ideal gas law for liquid fuel composition, the functions of a liquid flow meter and a gas calibration flow meter are organically combined. By applying the ideal gas law, the molar mass and chemical composition of complex liquid fuels can be effectively calibrated.

[0022] This liquid fuel composition calibration method and system based on the ideal gas law not only improves the accuracy of fuel composition determination but also simplifies the measurement process and reduces operational difficulty. Furthermore, by incorporating fuel chemical composition information, combustion parameters can be set more accurately, optimizing the combustion process, improving energy efficiency, and ensuring the safe operation of the system.

[0023] This paper proposes an indirect calibration method for liquid fuel components based on the ideal gas equation of state. The ideal gas equation of state offers significant advantages due to its simplicity and universality. It describes the relationships between gas state parameters (such as pressure, volume, temperature, and molar number). By designing appropriate experimental conditions, liquid fuels can be converted into gaseous mixtures, allowing for component analysis using this equation.

[0024] This liquid fuel composition calibration method and system based on the ideal gas law aims to combine the functions of a liquid flow meter and a gas calibration flow meter, and utilize the principle of the ideal gas law to achieve effective, rapid, and non-destructive calibration of the molar mass and chemical composition of complex liquid fuels, thereby meeting the needs of the energy and chemical industries for accurate analysis of liquid fuel components. Attached Figure Description

[0025] Figure 1 This is a flowchart of a liquid fuel component calibration method based on the ideal gas law.

[0026] Figure 2 This is a block diagram illustrating the principle of a liquid fuel component calibration system based on the ideal gas law. Detailed Implementation

[0027] Figures 1-2 This is the preferred embodiment of the present invention, which is described below in conjunction with the accompanying drawings. Figures 1-2 The present invention will be further described below.

[0028] Example 1:

[0029] like Figure 1As shown, the liquid fuel component calibration method based on the ideal gas law includes the following steps:

[0030] Step 1001: Monitor and record the mass flow rates of gaseous and liquid fuels;

[0031] Real-time monitoring and recording of the mass flow rate of liquid fuel using a liquid mass flow controller. Q Fuel To determine the mass of the liquid fuel at any given time. m Fuel Simultaneously, a nitrogen flow mass controller is used to monitor and record the nitrogen mass flow rate in real time. Q N2 .

[0032] Step 1002: Mix the liquid fuel and convert it into a gaseous state;

[0033] Liquid fuel is mixed with nitrogen at a known flow rate to form a gas-liquid mixture, which is then converted into a gaseous state using a controlled evaporation mixer to obtain a mixed gas, wherein the number of moles of nitrogen is... n N2 Known within a given time period, i.e., by mass flow rate. Q N2 get.

[0034] Step 1003: Record the total flow rate of the mixed gas;

[0035] Use a gas flow meter to record the total flow rate of the mixed gas. Q Flow-sum .

[0036] Step 1004, conversion of the molar number of the mixed gas;

[0037] Applying the ideal gas law, the total flow rate of the gas mixture is... Q Flow-sum Convert to the corresponding total number of moles n sum .

[0038] Step 1005: Calculate the number of moles of liquid fuel in the gas mixture;

[0039] From the total number of moles n sum Subtract the known number of moles of nitrogen from n N2 To calculate the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel The number of moles n Fuel As a data point.

[0040] Step 1006: Determine whether the data point has been reached;

[0041] Determine whether the number of data points collected in step 1005 has reached the preset collection quantity. If it has, proceed to step 1007. If it has not yet reached the preset collection quantity, return to step 1001 and execute steps 1001 to 1005 at another time to obtain the data points at that other time.

[0042] Step 1007: Calculate the molar mass of the liquid fuel;

[0043] Based on the collected data points, statistical and mathematical methods are used to construct... m Fuel and n Fuel A linear relationship model between them, where the slope of the linear relationship model reflects the molar mass of the liquid fuel.

[0044] In this step, the linear relationship model can be constructed using the least squares method or other mathematical optimization methods to improve the accuracy and reliability of the model.

[0045] Step 1008: Calculate the composition of the liquid fuel;

[0046] After completing step 1007, the specific chemical composition (C:H:O) of the fuel can be further determined by combining key parameters such as the hydrogen-to-carbon ratio (H / C) and oxygen content of the fuel, and the equivalence ratio of the liquid fuel can be accurately calculated using the linear relationship model through stoichiometry.

[0047] The calibration system that implements steps 1001 to 1007 above, such as Figure 2 As shown, the system includes a nitrogen cylinder and a liquid storage tank. The nitrogen cylinder is filled with nitrogen gas, and the liquid storage tank contains the aforementioned liquid fuel. One end of the nitrogen cylinder's outlet is connected to a gas mass flow controller, which controls the nitrogen flow rate. The other end is connected to the liquid storage tank through a first valve. The pressure of the nitrogen gas is used to drive the liquid fuel out of the storage tank. This portion of nitrogen gas serves as the driving gas to propel the liquid fuel out and is not output along with the liquid fuel.

[0048] The output of the storage tank is connected to a liquid mass flow controller via a second valve. The liquid mass flow controller monitors and records the mass flow rate of the liquid fuel. Q FuelThe outputs of both the liquid mass flow controller and the gas mass flow controller are connected to the input of the controlled evaporator mixer. The controlled evaporator mixer converts the liquid fuel into a gaseous state, which is then mixed with nitrogen supplied by the gas mass flow controller to obtain the aforementioned mixed gas. The output of the controlled evaporator mixer is connected to a gas flow meter, which records the total flow rate of the mixed gas. Q Flow-sum .

[0049] The specific calibration process and principle are as follows:

[0050] Open both the first and second valves, and simultaneously open the nitrogen cylinder. After opening, one path of the nitrogen gas flows directly into the gas mass flow controller, while the other path passes through the first valve into the storage tank. The storage tank contains the liquid fuel to be tested. The mass flow rate of the nitrogen entering the gas mass flow controller is monitored and recorded by the controller. Q N2 Nitrogen gas entering the storage tank through the first valve serves as the driving force to propel the liquid fuel output from the storage tank.

[0051] The liquid fuel output from the storage tank enters the liquid mass flow controller through the second valve. The liquid mass flow controller monitors and records the mass flow rate of the liquid fuel in real time. Q Fuel To determine the mass of the liquid fuel at any given time. m Fuel Nitrogen gas from the gas mass flow controller and liquid fuel from the liquid mass flow controller are simultaneously fed into the controlled evaporator mixer. The controlled evaporator mixer vaporizes the liquid fuel and mixes it with the nitrogen gas to obtain a mixed gas. After passing through the controlled evaporator controller, the mixed gas enters the gas flow meter, which records the total flow rate of the mixed gas. Q Flow-sum .

[0052] Applying the ideal gas law, the total flow rate of the gas mixture is... Q Flow-sum Convert to the corresponding total number of moles n sum Due to the number of moles of nitrogen n N2 Since it is also a known quantity within a given time period, therefore, from the total number of moles... n sum Subtract the known number of moles of nitrogen from n N2 To calculate the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel The number of moles n FuelAs a data point. After obtaining enough data points, construct... m Fuel and n Fuel A linear relationship model between the two is established, where the slope of the linear relationship model reflects the molar mass of the liquid fuel. Finally, using key parameters such as the fuel's hydrogen-to-carbon ratio (H / C) and oxygen content, the specific chemical composition (C:H:O) of the fuel is further determined using stoichiometry and the aforementioned linear relationship model, and the equivalence ratio of the fuel is accurately calculated.

[0053] Example 2:

[0054] The difference between this embodiment and Embodiment 1 is that the liquid fuel in the storage tank is a known fuel, such as n-heptane. Steps 1001 to 1008 in Embodiment 1 are performed to calculate the molar mass of the liquid fuel. Since the liquid fuel is a known fuel, the measurement error of the gas flow meter is evaluated by comparing the calculated molar mass of the liquid fuel with the theoretical molar mass of the liquid fuel.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for calibrating liquid fuel components based on the ideal gas law, characterized in that: Includes the following steps: Step a: Monitor and record the mass flow rate and mass of the liquid fuel at any given time. m Fuel And the mass flow rate of the auxiliary gas; Step b involves mixing the liquid fuel with the auxiliary gas and then vaporizing it to obtain a mixed gas. Step c, record the total flow rate of the mixed gas. Q Flow-sum ; Step d: Apply the ideal gas law to calculate the total flow rate of the mixed gas. Q Flow-sum Convert to the corresponding total number of moles n sum ; Step e: Calculate the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel and the number of moles n Fuel As a data point; In step e, from the total number of moles n sum Subtract the known number of moles of nitrogen from n N2 This gives the number of moles of liquid fuel in the gas mixture at the current moment. n Fuel ; Step f involves repeatedly executing steps a through e to obtain several data points at different times. Step g, based on all data points, construct m Fuel and n Fuel A linear relationship model between them was established, and the molar mass of the liquid fuel was obtained using the linear relationship model. Step h calculates the composition of the liquid fuel; After completing step g, the specific chemical composition of the fuel is determined by using the linear relationship model based on the hydrogen-to-carbon ratio and oxygen content of the liquid fuel, and the equivalence ratio of the liquid fuel is calculated.

2. The liquid fuel component calibration method based on the ideal gas law according to claim 1, characterized in that: In step g, the molar mass of the liquid fuel is obtained based on the slope of the linear relationship model.

3. The liquid fuel component calibration method based on the ideal gas law according to claim 1, characterized in that: In step g, a linear relationship model is constructed using the least squares method.

4. The liquid fuel component calibration method based on the ideal gas law according to claim 1, characterized in that: In step a, the auxiliary gas is nitrogen.

5. A system for implementing the liquid fuel component calibration method based on the ideal gas law as described in any one of claims 1 to 4, characterized in that: It includes a gas storage tank for storing auxiliary gas and a liquid storage tank for storing liquid fuel. The gas storage tank is connected to a gas mass flow controller. The gas storage tank is also connected to the liquid storage tank. The outlet of the liquid storage tank is connected to a liquid flow controller. The outlets of the gas mass flow controller and the liquid flow controller are simultaneously connected to a controllable evaporator mixer. The controllable evaporator mixer is connected to a gas flow meter.

6. The system according to claim 5, characterized in that: A first valve is installed between the gas storage cylinder and the liquid storage cylinder, and a second valve is installed between the liquid storage tank and the liquid mass flow controller.

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