Industrial energy consumption calculation method, computer device and computer readable storage medium

Abstract

The application discloses an industrial energy consumption calculation method, computer equipment and a computer readable storage medium, and relates to the technical field of data processing. The method comprises the following steps: calculating the entropy change of a substance from an initial thermodynamic state to a final thermodynamic state; calculating the internal energy change of the substance according to the entropy change of the substance; calculating the Gibbs free energy change of a chemical reaction from the initial thermodynamic state to the final thermodynamic state; calculating the thermodynamic enthalpy change according to the internal energy change of the substance and the Gibbs free energy change; obtaining a sensible heat lifting item and an actual process recycling deduction amount, calculating the sum of the thermodynamic enthalpy change and the sensible heat lifting item, calculating the difference between the sum and the actual process recycling deduction amount, and obtaining the theoretical energy consumption of the chemical reaction. In this way, the minimum energy consumption value of the constructed thermodynamic theory can be used as a key index to analyze and quantitatively compare the energy efficiency levels of different smelting processes, different process technologies and the like.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, and in particular to an industrial energy consumption calculation method, computer equipment, and computer-readable storage medium. Background Technology

[0002] Metallurgical industries such as iron, magnesium, and aluminum are pillar industries for social modernization and national economic development, generally characterized by energy-intensive use (high energy consumption) and high CO2 emissions (high emissions). Against the backdrop of global energy shortages and carbon emission constraints, improving the energy efficiency of traditional manufacturing industries such as metallurgy is considered the most direct means of industrial energy conservation and carbon reduction.

[0003] Because the metallurgical manufacturing industry is diverse, different metal production processes vary, and the unit energy consumption of products is uneven, there is a lack of unified energy efficiency indicators and other scientific evaluation methods, making it difficult to accurately quantify or compare the energy-saving and carbon-reduction potential of different processes and technologies. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an industrial energy consumption calculation method, computer equipment and computer-readable storage medium.

[0005] This invention provides the following technical solution: In a first aspect, the present invention provides an industrial energy consumption calculation method, the method comprising: Using the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state, calculate the entropy change from the initial thermodynamic state to the final thermodynamic state. Calculate the change in internal energy of a substance based on its entropy change; Calculate the Gibbs free energy change of a chemical reaction from its initial thermodynamic state to its final thermodynamic state; Calculate the thermodynamic enthalpy change based on the change in internal energy of a substance and the Gibbs free energy change; Obtain the sensible heat enhancement term and the actual process recycling deduction amount, calculate the sum of thermodynamic enthalpy change and sensible heat enhancement term, calculate the difference between the sum and the actual process recycling deduction amount, and obtain the theoretical energy consumption of the chemical reaction.

[0006] In an optional implementation, obtaining the sensible heat enhancement item and the actual process recycling deduction includes: Obtain the isobaric specific heat capacity, mass flow rate, and reaction temperature difference of the chemical reaction, and calculate the sensible heat increase term based on the isobaric specific heat capacity, mass flow rate, and reaction temperature difference; Obtain the recycling type of the chemical reaction. If the recycling type is energy recycling, the actual process recycling deduction amount is the emission temperature (°C) or emission pressure (°C). If the recycling type is material recycling, the actual process recycling deduction amount is the energy carried by the recycled material.

[0007] In an optional implementation, calculating the entropy change of matter from the initial thermodynamic state to the final thermodynamic state includes: Obtain the thermodynamic temperature curves of a substance from its initial thermodynamic state to its final thermodynamic state, as well as the state parameters of a solid substance. The isobaric heat capacity of different substances at different thermodynamic temperatures is obtained based on the thermodynamic temperature curves and solid state parameters. Calculate the entropy change of a substance based on its thermodynamic temperature curve and its isobaric heat capacity at different thermodynamic temperatures.

[0008] In an optional implementation, calculating the change in internal energy of matter based on the entropy change of matter includes: The product of a substance's thermodynamic temperature and its entropy change is taken as the change in the substance's internal energy.

[0009] In an optional implementation, the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state is calculated, including: To obtain the number of electrons transferred and the electromotive force in a chemical reaction; Calculate the Gibbs free energy change based on the electron transfer number, electromotive force, and Faraday constant.

[0010] In an optional implementation, the thermodynamic enthalpy change is calculated based on the change in internal energy of the substance and the Gibbs free energy change, including: The sum of the change in internal energy of a substance and the change in Gibbs free energy is taken as the thermodynamic enthalpy change.

[0011] In an optional implementation, the method further includes: Obtain the theoretical energy consumption corresponding to each of the multiple processes in the industrial process; The process energy efficiency is determined based on the theoretical energy consumption corresponding to each process step.

[0012] Optionally, the method also includes: using the sum of the sensible heat increase term and the thermodynamic enthalpy change as the theoretical energy consumption of the chemical reaction; or using the thermodynamic enthalpy change as the theoretical energy consumption of the chemical reaction.

[0013] In a second aspect, the present invention provides an industrial energy consumption calculation device, the device comprising: The first calculation module is used to calculate the entropy change of matter from the initial thermodynamic state to the final thermodynamic state, taking the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state. The second calculation module is used to calculate the change in internal energy of matter based on the entropy change of matter. The third calculation module is used to calculate the Gibbs free energy change of a chemical reaction from the initial thermodynamic state to the final thermodynamic state. The fourth calculation module is used to calculate the thermodynamic enthalpy change based on the change in internal energy of matter and the Gibbs free energy change; The fifth calculation module is used to obtain the sensible heat enhancement item and the actual process recycling deduction amount, calculate the sum of thermodynamic enthalpy change and sensible heat enhancement item, calculate the difference between the sum and the actual process recycling deduction amount, and obtain the theoretical energy consumption of the chemical reaction.

[0014] Thirdly, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the industrial energy consumption calculation method as described in any of the foregoing embodiments.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the industrial energy consumption calculation method as described in any of the foregoing embodiments.

[0016] The present invention discloses an industrial energy consumption calculation method, computer equipment, and computer-readable storage medium. It takes a smelting raw material containing a target metal element as the initial thermodynamic state and a purified product containing the target metal element as the final thermodynamic state. The method calculates the entropy change of matter from the initial thermodynamic state to the final thermodynamic state; calculates the change in internal energy of matter based on the entropy change; calculates the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state; calculates the thermodynamic enthalpy change based on the change in internal energy and the Gibbs free energy change; obtains the sensible heat enhancement term and the actual process recycling deduction amount; calculates the sum of the thermodynamic enthalpy change and the sensible heat enhancement term; calculates the difference between the sum and the actual process recycling deduction amount; and obtains the theoretical energy consumption of the chemical reaction. In this way, the changes in physical structure and the changes in the degree of disorder of matter caused by chemical reactions are characterized by the changes in entropy and Gibbs free energy, respectively. And the changes in enthalpy of the initial and final states before and after smelting are unified by the basic thermodynamic principles. Furthermore, the dynamic balance calculation of the sensible heat enhancement term and the deduction amount of process recycling is introduced to achieve precise decoupling of the theoretical minimum energy consumption. Thus, a scientific and unified method for calculating the energy consumption of material separation theory is established. Then, the constructed thermodynamic theoretical minimum energy consumption value can be used as a key indicator to analyze and quantify the energy efficiency levels of different smelting processes and different process technologies, and solve problems such as the difficulty in accurately evaluating process rationality and energy efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope of protection of the present invention. In the various drawings, similar components are numbered similarly.

[0018] Figure 1 A flowchart illustrating the industrial energy consumption calculation method proposed in this embodiment is shown. Figure 2 This embodiment illustrates the physical and chemical separation of iron ore in ironmaking. Figure 3 Another flowchart of the industrial energy consumption calculation method proposed in this embodiment is shown; Figure 4 This diagram illustrates another step in the industrial energy consumption calculation method proposed in this embodiment. Figure 5 A schematic diagram of the industrial energy consumption calculation device proposed in this embodiment is shown.

[0019] Explanation of reference numerals in the attached diagram: 500 - Industrial energy consumption calculation device; 501 - First calculation module; 502 - Second calculation module; 503 - Third calculation module; 504 - Fourth calculation module; 505 - Fifth calculation module. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] The components of the embodiments of the invention described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of the invention, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0023] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the invention pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of the invention.

[0025] Example 1 This disclosure provides an industrial energy consumption calculation method, which calculates the minimum theoretical energy consumption from the perspective of system thermodynamics, based on the physical and chemical disorder changes of the initial and final states of materials before and after a single-process smelting.

[0026] Please see Figure 1 The industrial energy consumption calculation method includes steps S101 to S105, and each step is described in detail below.

[0027] Step S101: Using the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state, calculate the entropy change of matter from the initial thermodynamic state to the final thermodynamic state.

[0028] In this embodiment, the initial and final states are strictly anchored to the physicochemical state of actual industrial materials, and the entropy change of the material is calculated accordingly. This ensures that the entropy change truly reflects the degree of structural ordering from disordered impurity raw materials to highly ordered elemental / alloy products, providing an irreplaceable and realistic thermodynamic starting point for subsequent internal energy and energy consumption calculations.

[0029] In one specific embodiment, step S101 includes: obtaining the thermodynamic temperature curve of the substance from the initial thermodynamic state to the final thermodynamic state and the state parameters of the solid substance; obtaining the isobaric heat capacity at different thermodynamic temperatures of the substance based on the thermodynamic temperature curve of the substance and the state parameters of the solid substance; and calculating the entropy change of the substance based on the thermodynamic temperature curve of the substance and the isobaric heat capacity at different thermodynamic temperatures of the substance.

[0030] In this embodiment, for the entropy change caused by the change in the physical structure of matter, the initial state entropy S1 and the final state entropy S2 are calculated using the number of microstates of a thermodynamic system. Therefore, the entropy change ΔS between the initial and final states is: In the formula, T is the thermodynamic temperature of the substance, and C is the temperature of the substance. p (T) represents the isobaric heat capacity corresponding to the thermodynamic temperature of the substance.

[0031] The thermodynamic temperature T of the material is obtained by real-time monitoring and recording the thermodynamic temperature curve from the initial thermodynamic state to the final thermodynamic state using distributed thermocouple probes arranged inside the furnace. Simultaneously, X-ray fluorescence spectroscopy (XRF) is used to measure the changes in solid composition at the initial and final states. Based on the characteristic X-ray fluorescence measured by X-ray excitation of inner-shell electrons, the state curve of the solid material is analyzed. Finally, based on the thermodynamic temperature curve and the state curve of the solid material, the C content under different states is determined. p (T).

[0032] For example, please see Figure 2 Taking iron oxide (Fe3O4) in the thermal reduction smelting process of iron ore as an example, X represents the reducing agent element used for iron ore reduction (for example, CO2 is used to reduce iron with C, and H2O is used to reduce iron with H). If electrolysis is used without a reducing agent, it is O2.

[0033] Solid smelting raw materials (i.e., iron ore) and solid products (i.e., iron products) are both considered as independent and distinguishable particle systems, and their entropy changes are as follows: , In the formula, S1 FexOy FexOy represents the entropy of iron ore in its initial thermodynamic state (FexOy can represent iron oxides in different valence states such as Fe2O3, Fe3O4, FeO, and Fe); S2 Fe The entropy of the iron product in its final thermodynamic state; T is the thermodynamic temperature; C p FexOy This is the isobaric heat capacity of FexOy.

[0034] Gaseous products (i.e., XO produced by the combination of O in iron ore and reducing agent X) x A gas (or O2 if there is no reducing agent) is considered an indistinguishable ideal gas, and its entropy change is: In the formula, S2 XOx S1 O The final thermodynamic state XO x The entropy of matter in a gas at its initial thermodynamic state O, where T is the thermodynamic temperature; C p XOx This is the isobaric heat capacity of XOx.

[0035] Total entropy change (ΔS) between the initial and final states of the iron ore reduction ironmaking process 1—>2 FexOy Then it is: .

[0036] Step S102: Calculate the change in internal energy of the substance based on the entropy change of the substance.

[0037] In this embodiment, the change in internal energy of matter is calculated by using the entropy change of matter, and a quantitative mapping relationship between the degree of structural ordering and the intrinsic energy consumption of matter is established, avoiding the dependence on modeling complex many-body interactions.

[0038] In one specific embodiment, step S102 includes: taking the product of the thermodynamic temperature of the substance and the entropy change of the substance as the change in internal energy of the substance.

[0039] In this embodiment, the formula for calculating the change in internal energy ΔU of a substance is: This transforms the internal energy change, which is difficult to measure directly, into the product of structural entropy change and measurable temperature, obtainable through thermal capacity integration. This maintains thermodynamic consistency while significantly lowering the barrier to engineering implementation. This approach frees internal energy calculations from reliance on first-principles simulations or molecular dynamics simulations, making rapid deployment at the factory site feasible.

[0040] Step S103: Calculate the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state.

[0041] In this embodiment, the change in disorder caused by the chemical reaction from the initial thermodynamic state to the final thermodynamic state is characterized by the system's thermodynamic potential. The Gibbs free energy change of the chemical reaction can be calculated by the number of electrons transferred during the reaction process, thus clarifying the theoretical lower limit of energy consumption for electrochemical or redox processes. The driving force required for the reduction reaction of solid smelting raw materials (e.g., iron ore) is considered as the equivalent potential.

[0042] In one specific embodiment, step S103 includes: obtaining the number of electrons transferred and the electromotive force of the chemical reaction; and calculating the Gibbs free energy change based on the number of electrons transferred, the electromotive force, and the Faraday constant.

[0043] In this embodiment, regarding the Gibbs free energy change induced by a chemical reaction, referring to the principle of calculating the maximum non-volume work that a spontaneous process system can do based on the number of electrons transferred in an electrochemical reaction, the minimum non-volume work required by a non-spontaneous process system is analyzed using electromotive force, i.e., the Gibbs free energy change ΔG of the chemical reaction: In the formula, n is the number of electrons transferred, F is the Faraday constant (96485 C / mol), and E is the electromotive force. The number of electrons transferred, n, can be obtained based on the Nernst equation method by changing the concentration ratio of the oxidized and reduced states of the substance, measuring the corresponding equilibrium potential, and then fitting the slope. The electromotive force, E, can be obtained using a potentiometer (compensation method), by using a known standard electromotive force to counteract the electromotive force to be measured.

[0044] As an example, the number of electrons transferred during the iron ore reduction process is calculated, and the Gibbs free energy change (ΔG) driving the iron ore reduction reaction is estimated by referring to the concept of electromotive force in electrochemistry. 1—>2 FexOy),Right now In the formula, if 1 mol of Fe₂O₃ is reduced to Fe, 6 electrons need to be transferred, so n=6; if 1 mol of Fe₃O₄ is reduced to Fe, 8 electrons need to be transferred, so n=8; if 1 mol of FeO is reduced to Fe, 2 electrons need to be transferred, so n=2; E FexOy is the electromotive force of the iron oxide.

[0045] Step S104: Calculate the thermodynamic enthalpy change based on the change in internal energy of the substance and the change in Gibbs free energy.

[0046] In this embodiment, based on fundamental thermodynamic relationships, thermodynamic enthalpy change is calculated according to changes in internal energy and Gibbs free energy, and a unified theoretical energy consumption characterization quantity coupled with multiple energy forms for industrial scenarios is constructed, realizing the additivity and comparability of thermal energy, electrical energy, and chemical energy on the same thermodynamic scale.

[0047] In one specific embodiment, step S104 includes: taking the sum of the change in internal energy of the substance and the change in Gibbs free energy as the thermodynamic enthalpy change.

[0048] In this embodiment, the formula for calculating the thermodynamic enthalpy change ΔH is: Demonstratively, the thermodynamic enthalpy change (ΔH) of the system before and after iron ore reduction is calculated. 1—>2 FexOy ),Right now .

[0049] Step S105: Obtain the sensible heat enhancement item and the actual process recycling deduction amount, calculate the sum of thermodynamic enthalpy change and sensible heat enhancement item, calculate the difference between the sum and the actual process recycling deduction amount, and obtain the theoretical energy consumption of the chemical reaction.

[0050] In this embodiment, please refer to Figure 3 Since enthalpy change only describes the heat absorbed or released in a theoretical chemical reaction and does not include the sensible heat required to reach the reaction temperature in actual production, a sensible heat increase term Q is introduced to consider the actual temperature required for the chemical reaction to occur. 显热 .

[0051] Furthermore, combining the theoretical energy consumption of process A - the recyclable energy of process A = the actual theoretical energy consumption of process A = fully considering chemical heat + temperature rise - actual process energy / mass recycling deduction, the theoretical energy consumption of the chemical reaction can be designed as E=Q. 显热 +△H- Q 循环利用抵扣量 In the formula, Q 循环利用抵扣量The actual recycling amount is used to offset the theoretical energy consumption, making the theoretical energy consumption estimate more realistic. For example, considering the energy / mass recycling, the theoretical energy consumption of ironmaking is 283.2 kgce / t-Fe – (~average 8 kgce / t-Fe) = 275.2 kgce / t-Fe.

[0052] Taking blast furnace ironmaking as an example, the enthalpy change of the carbothermic reduction reaction of Fe2O3 in iron ore is approximately ΔH = 7.4 GJ / t-Fe. This reaction is carried out at high temperatures (theoretically, the reaction temperature is >900 K). The calculated sensible heat increase energy requirement for this reaction is approximately Q. 显热 =0.9 GJ / t-Fe.

[0053] Therefore, if the energy / mass recycling in the ironmaking process is not considered, the direct theoretical energy consumption is E=Q. 显热 +△H=7.4+0.9=8.3GJ / t-Fe (equivalent to 283.2 kgce / t-Fe).

[0054] However, in actual practice, the carbothermic reduction reaction of Fe2O3 in iron ore also produces high-temperature flue gas and slag. These high-temperature flue gas and slag carry a portion of sensible heat (averaging approximately Q). 循环利用抵扣量 =~8 kgce / t-Fe), this sensible heat is not the effective heat provided for iron reduction, so it should be deducted. Therefore, the more realistic theoretical energy consumption E=Q 显热 +△HQ 循环利用抵扣量 =283.2 kgce / t-Fe - 8 kgce / t-Fe=275. 2 kgce / t-Fe.

[0055] In one specific embodiment, step S105 includes: obtaining the isobaric specific heat capacity, mass flow rate, and reaction temperature difference of the chemical reaction; calculating the sensible heat enhancement term based on the isobaric specific heat capacity, mass flow rate, and reaction temperature difference; obtaining the recycling type of the chemical reaction; if the recycling type is energy recycling, the actual process recycling deduction amount is the emission temperature (°C) or emission pressure (°C); if the recycling type is material recycling, the actual process recycling deduction amount is the energy carried by the recycled material.

[0056] In this embodiment, the formula for calculating the sensible heat increase term is: Q 显热 =c p ×m×△T, where c p ΔT is the specific heat capacity at constant pressure, m is the mass flow rate, and ΔT is the reaction temperature difference, i.e., the difference between the reaction temperature and the initial temperature.

[0057] Simultaneously, the recycling type of the chemical reaction is determined. If the recycling type is energy recycling, the reaction recovery type is further determined. If the reaction recovery type is waste heat recovery, the actual process recycling deduction is the emission temperature (waste heat); if the reaction recovery type is waste pressure recovery, the actual process recycling deduction is the emission pressure (waste pressure); if the recycling type is material recycling, the actual process recycling deduction is the energy carried by the recycled material (the energy carried by the recycled material), that is, the energy contained in a unit mass of material. For example, nitrogen gas has an energy content of 11.72 MJ / m³. 3 (2 800 kcal / m 3 Compressed air 1.17 MJ / m 3 (280 kcal / m 3 )wait.

[0058] It should be noted that if the process involves both energy and material recycling, the actual recycling deduction amount is the sum of the utilization of all waste heat, waste pressure, and waste materials.

[0059] In addition, the sum of the sensible heat increase and the thermodynamic enthalpy change can be used as the theoretical energy consumption of a chemical reaction. For example, considering that the sensible heat required to reach the reaction equilibrium temperature is 0.9 GJ (heating the raw materials to 913.71 K), the total energy required is... The result is 7.4 + 0.9 = 8.3 GJ / t-Fe (equivalent to 283.2 kgce / t-Fe, taking into account the temperature conditions required for the reaction to occur).

[0060] Application scenarios for using the sum of sensible heat increase and thermodynamic enthalpy change as theoretical energy consumption: If the residual heat generated in the smelting process is very small (accounting for a very small percentage and can be ignored) or difficult to recover and utilize (difficult to actually offset and can be ignored), it is recommended to directly use the sum of sensible heat increase and thermodynamic enthalpy change as theoretical energy consumption for estimation.

[0061] For example, in the production process of synthetic iron ore (sintered ore), the flue gas temperature at the head of the sintering machine is close to the ambient temperature (containing almost no usable residual heat). At this time, the sum of the sensible heat increase term and the thermodynamic enthalpy change can be directly used as the theoretical energy consumption.

[0062] In addition, the minimum theoretical energy consumption of the smelting process can also be regarded as the result of the combined effect of the changes in the physical state of the material before and after smelting and the energy changes of the chemical reaction forming / breaking bonds. It can be characterized by the enthalpy change ΔH of the thermodynamic system. That is, the thermodynamic enthalpy change is taken as the minimum theoretical energy consumption of the chemical reaction. In this way, the energy efficiency levels of different smelting processes and different technologies can be analyzed and quantitatively compared, and the problems of process rationality and difficulty in accurately evaluating energy efficiency can be solved.

[0063] Application scenarios where enthalpy change is directly used as theoretical energy consumption: When conducting feasibility analysis at the beginning of process construction or when optimizing smelting process, it is recommended to initially use enthalpy change as theoretical energy consumption for estimation.

[0064] For example, when selecting the optimal reduction path for iron ore, C reduction or H reduction can be considered. By comparing the enthalpy change of C reduction of Fe2O3 and H reduction of Fe2O3, the optimal ironmaking process and the selection of reducing agent can be preliminarily determined.

[0065] Enthalpy change refers to the change in internal energy of a system (under constant pressure) plus the volume work done by the system on the surrounding environment. This is the energy change from the breaking and formation of chemical bonds (internal energy change) plus the work done by the system's volume expansion or contraction (PV work). Therefore, enthalpy change reflects the energy change during chemical bond recombination and can be used as a theoretical measure of energy consumption in metallurgical and chemical engineering processes involving chemical reactions.

[0066] Taking the carbothermic reduction of FexOy as an example, the theoretical energy requirement (first level, considering only the initial and final states) is calculated as E=ΔH. Taking hematite (Fe2O3) as an example, ideally, assuming pure iron oxide can decompose into elements, the reaction is as follows: Hematite: ,correspond, .

[0067] in, This represents the change in enthalpy of the reaction when the reactants and products are each at a standard pressure of 100 kPa and 298 K.

[0068] Iron ore is reduced at high temperatures using carbon (actually carbon monoxide) as a chemical reducing agent. Theoretically, this reaction can be described as follows: Hematite: correspond, However, the carbon consumed in this process has a direct energy carrying capacity: the calorific value of carbon is 393.5 kJ / mol, or 32.8 MJ / kg. According to the hematite reaction, producing 1 t of Fe requires 161.2 kg of carbon, equivalent to 5.3 GJ. Therefore, the total minimum energy requirement for this reaction is 7.4 GJ / t-Fe (equivalent to 252.5 kgce / t-Fe, without considering the temperature conditions required for the reaction to occur).

[0069] It should be noted that E = Q sensible heat + ΔH - Q 循环利用抵扣量It is the most complete theoretical energy consumption estimation method. The technical solution E=Q sensible heat + ΔH is mainly used in scenarios where the residual heat generated in the smelting process is very small (accounting for a very small percentage, negligible) or difficult to recover and utilize (difficult to actually offset, negligible). The technical solution E=ΔH is mainly used in scenarios where feasibility analysis is conducted at the beginning of process construction, or in scenarios where smelting process optimization (comparison of the reaction enthalpy change of iron reduction by different reducing agents) is performed.

[0070] It should be further noted that for smelting processes involving multiple components or multiple chemical reactions, the corresponding minimum theoretical energy consumption can be expressed as the sum of the theoretical energy consumption of each component along its respective path, i.e. In the formula, j represents the chemical reaction number, m represents the total number of reactions, and [E] j This represents the theoretical energy consumption of the j-th chemical reaction.

[0071] For example, taking enthalpy change directly as the theoretical energy consumption, since iron ore reduction involves multiple iron-containing oxides (i.e., Fe2O3, Fe3O4, FeO) and several reactions, the theoretical energy consumption of iron reduction is calculated as follows: .

[0072] In one specific embodiment, the method further includes: obtaining the theoretical energy consumption corresponding to multiple processes in the industrial process; and determining the process energy efficiency based on the theoretical energy consumption corresponding to each process.

[0073] In this embodiment, please refer to Figure 4 For a smelting process containing n processes (n≥2), regardless of whether the processes are connected in series or in parallel, first calculate the theoretical energy efficiency η of each process. i Then, the energy efficiency of each process is weighted according to the proportion of energy consumed in each process to the total energy input, and the sum is the process energy efficiency η.

[0074] The calculation formula is: , In the formula, i represents the sequence number of the smelting process, E i t E represents the theoretical energy consumption of the i-th process. i s a represents the actual energy consumption of the i-th process; n represents the total number of processes, a i This represents the proportion of energy consumption of the i-th process to the total energy consumption.

[0075] In actual operation, taking the parallel flow of energy through each process as an example, it is necessary to simultaneously collect the energy consumption E of the entire process. s And the energy input E at each process interface i in and output item E i out The difference between the two is taken as the actual energy consumption E of the process.i s And the proportion of process energy consumption to total energy consumption (a) i .in, , .

[0076] The industrial energy consumption calculation method proposed in this embodiment takes the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state; calculates the entropy change of matter from the initial thermodynamic state to the final thermodynamic state; calculates the change of internal energy of matter based on the entropy change; calculates the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state; calculates the thermodynamic enthalpy change based on the change of internal energy of matter and the Gibbs free energy change; obtains the sensible heat enhancement term and the actual process recycling deduction amount; calculates the sum of the thermodynamic enthalpy change and the sensible heat enhancement term; calculates the difference between the sum and the actual process recycling deduction amount to obtain the theoretical energy consumption of the chemical reaction. In this way, the changes in physical structure and the changes in the degree of disorder of matter caused by chemical reactions are characterized by the changes in entropy and Gibbs free energy, respectively. And the changes in enthalpy of the initial and final states before and after smelting are unified by the basic thermodynamic principles. Furthermore, the dynamic balance calculation of the sensible heat enhancement term and the deduction amount of process recycling is introduced to achieve precise decoupling of the theoretical minimum energy consumption. Thus, a scientific and unified method for calculating the energy consumption of material separation theory is established. Then, the constructed thermodynamic theoretical minimum energy consumption value can be used as a key indicator to analyze and quantify the energy efficiency levels of different smelting processes and different process technologies, and solve problems such as the difficulty in accurately evaluating process rationality and energy efficiency.

[0077] Example 2 Furthermore, this disclosure provides an industrial energy consumption calculation device 500, please refer to [link to relevant documentation]. Figure 5 The device includes: The first calculation module 501 is used to calculate the entropy change of matter from the initial thermodynamic state to the final thermodynamic state, taking the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state. The second calculation module 502 is used to calculate the change in internal energy of a substance based on the entropy change of the substance. The third calculation module 503 is used to calculate the Gibbs free energy change of a chemical reaction from the initial thermodynamic state to the final thermodynamic state. The fourth calculation module 504 is used to calculate the thermodynamic enthalpy change based on the change in internal energy of matter and the Gibbs free energy change; The fifth calculation module 505 is used to obtain the sensible heat enhancement item and the actual process recycling deduction amount, calculate the sum of thermodynamic enthalpy change and sensible heat enhancement item, calculate the difference between the sum and the actual process recycling deduction amount, and obtain the theoretical energy consumption of the chemical reaction.

[0078] Optionally, the fifth calculation module 505 is also used to obtain the isobaric specific heat capacity, mass flow rate, and reaction temperature difference of the chemical reaction, and to calculate the sensible heat enhancement item based on the isobaric specific heat capacity, mass flow rate, and reaction temperature difference; to obtain the recycling type of the chemical reaction; if the recycling type is energy recycling, the actual process recycling deduction amount is the emission temperature (°C) or emission pressure (°C); if the recycling type is material recycling, the actual process recycling deduction amount is the energy carried by the recycled material.

[0079] Optionally, the fifth calculation module 505 is also used to take the sum of the sensible heat increase term and the thermodynamic enthalpy change as the theoretical energy consumption of the chemical reaction; or, to take the thermodynamic enthalpy change as the theoretical energy consumption of the chemical reaction.

[0080] Optionally, the first calculation module 501 is also used to obtain the thermodynamic temperature curve of the substance from the initial thermodynamic state to the final thermodynamic state and the state parameters of the solid substance; to obtain the isobaric heat capacity of the substance at different thermodynamic temperatures based on the thermodynamic temperature curve of the substance and the state parameters of the solid substance; and to calculate the entropy change of the substance based on the thermodynamic temperature curve of the substance and the isobaric heat capacity of the substance at different thermodynamic temperatures.

[0081] Optionally, the second calculation module 502 is also used to take the product of the thermodynamic temperature of the substance and the entropy change of the substance as the change of internal energy of the substance.

[0082] Optionally, the third calculation module 503 is also used to obtain the number of electrons transferred and the electromotive force of the chemical reaction; and to calculate the Gibbs free energy change based on the number of electrons transferred, the electromotive force and the Faraday constant.

[0083] Optionally, the fourth calculation module 504 is also used to treat the sum of the change in internal energy of a substance and the change in Gibbs free energy as the thermodynamic enthalpy change.

[0084] Optionally, the fifth calculation module 505 is also used to obtain the theoretical energy consumption corresponding to multiple processes in the industrial process; and to determine the process energy efficiency based on the theoretical energy consumption corresponding to each process.

[0085] The apparatus provided in this embodiment can execute the steps of the industrial energy consumption calculation method provided in Embodiment 1. To avoid repetition, the steps will not be repeated.

[0086] The industrial energy consumption calculation device proposed in this embodiment takes the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state; calculates the entropy change of matter from the initial thermodynamic state to the final thermodynamic state; calculates the change of internal energy of matter based on the entropy change; calculates the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state; calculates the thermodynamic enthalpy change based on the change of internal energy of matter and the Gibbs free energy change; obtains the sensible heat enhancement term and the actual process recycling deduction amount, calculates the sum of the thermodynamic enthalpy change and the sensible heat enhancement term, calculates the difference between the sum and the actual process recycling deduction amount, and obtains the theoretical energy consumption of the chemical reaction. In this way, the changes in physical structure and the changes in the degree of disorder of matter caused by chemical reactions are characterized by the changes in entropy and Gibbs free energy, respectively. And the changes in enthalpy of the initial and final states before and after smelting are unified by the basic thermodynamic principles. Furthermore, the dynamic balance calculation of the sensible heat enhancement term and the deduction amount of process recycling is introduced to achieve precise decoupling of the theoretical minimum energy consumption. Thus, a scientific and unified method for calculating the energy consumption of material separation theory is established. Then, the constructed thermodynamic theoretical minimum energy consumption value can be used as a key indicator to analyze and quantify the energy efficiency levels of different smelting processes and different process technologies, and solve problems such as the difficulty in accurately evaluating process rationality and energy efficiency.

[0087] Example 3 Furthermore, this disclosure provides a computer device including a memory and a processor. The memory stores a computer program, which, when executed by the processor, implements the industrial energy consumption calculation method described in Embodiment 1.

[0088] The device provided in this embodiment can execute the steps of the industrial energy consumption calculation method provided in Embodiment 1. To avoid repetition, the steps will not be repeated.

[0089] Example 4 This disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the industrial energy consumption calculation method described in Embodiment 1.

[0090] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0091] The computer-readable storage medium provided in this embodiment can implement the industrial energy consumption calculation method provided in Embodiment 1. To avoid repetition, it will not be described again here.

[0092] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0093] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0094] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for calculating industrial energy consumption, characterized in that, The method includes: Using the smelting raw material containing the target metal element as the initial thermodynamic state and the purified product containing the target metal element as the final thermodynamic state, calculate the entropy change from the initial thermodynamic state to the final thermodynamic state. Calculate the change in internal energy of the substance based on the entropy change of the substance; Calculate the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state; Thermodynamic enthalpy change is calculated based on the change in internal energy of the substance and the change in Gibbs free energy. Obtain the sensible heat enhancement item and the actual process recycling deduction amount, calculate the sum of the thermodynamic enthalpy change and the sensible heat enhancement item, calculate the difference between the sum and the actual process recycling deduction amount, and obtain the theoretical energy consumption of the chemical reaction.

2. The industrial energy consumption calculation method according to claim 1, characterized in that, The acquisition of sensible heat enhancement items and actual process recycling deductions include: Obtain the isobaric specific heat capacity, mass flow rate, and reaction temperature difference of the chemical reaction, and calculate the sensible heat enhancement term based on the isobaric specific heat capacity, the mass flow rate, and the reaction temperature difference; Obtain the recycling type of the chemical reaction. If the recycling type is energy recycling, the actual process recycling deduction amount is the emission temperature (°C) or emission pressure (°C). If the recycling type is material recycling, the actual process recycling deduction amount is the energy carried by the recycled material.

3. The industrial energy consumption calculation method according to claim 1, characterized in that, The calculation of the entropy change of matter from the initial thermodynamic state to the final thermodynamic state includes: Obtain the thermodynamic temperature curve of the substance from the initial thermodynamic state to the final thermodynamic state and the state parameters of the solid substance; The isobaric heat capacity of the substance at different thermodynamic temperatures is obtained based on the thermodynamic temperature curve of the substance and the state parameters of the solid substance. The entropy change of the substance is calculated based on the thermodynamic temperature curve of the substance and the isobaric heat capacity of the substance at different thermodynamic temperatures.

4. The industrial energy consumption calculation method according to claim 3, characterized in that, The calculation of the change in internal energy of a substance based on its entropy change includes: The product of the thermodynamic temperature of the substance and the entropy change of the substance is taken as the change in the internal energy of the substance.

5. The industrial energy consumption calculation method according to claim 1, characterized in that, The calculation of the Gibbs free energy change of the chemical reaction from the initial thermodynamic state to the final thermodynamic state includes: Obtain the number of electrons transferred and the electromotive force of the chemical reaction; The Gibbs free energy change is calculated based on the electron transfer number, the electromotive force, and the Faraday constant.

6. The industrial energy consumption calculation method according to claim 1, characterized in that, The calculation of thermodynamic enthalpy change based on the change in internal energy of the substance and the Gibbs free energy change includes: The sum of the change in internal energy of the substance and the change in Gibbs free energy is taken as the thermodynamic enthalpy change.

7. The industrial energy consumption calculation method according to claim 1, characterized in that, The method further includes: Obtain the theoretical energy consumption corresponding to each of the multiple processes in the industrial process; The process energy efficiency is determined based on the theoretical energy consumption corresponding to each of the aforementioned processes.

8. The industrial energy consumption calculation method according to claim 1, characterized in that, The method further includes: The sum of the sensible heat increase term and the thermodynamic enthalpy change is taken as the theoretical energy consumption of the chemical reaction; Alternatively, the thermodynamic enthalpy change can be used as the theoretical energy consumption of the chemical reaction.

9. A computer device, characterized in that, It includes a memory and a processor, the memory storing a computer program that, when executed by the processor, implements the industrial energy consumption calculation method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the industrial energy consumption calculation method as described in any one of claims 1 to 7.

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