Vanadium oxide wet extraction scale-up platform oil bath heating method

Abstract

The application provides a vanadium oxide wet extraction expansion test platform oil bath heating method and relates to the field of wet vanadium extraction oil bath heating model algorithm, and comprises the following steps: opening a heater, heating conductive oil to a limit temperature T e , the limit temperature T e is greater than a set temperature T s ; when real-time oil temperature T o is greater than T e , the heater is turned off, the conductive oil continues to circulate and exchange heat with a reaction kettle through an oil pump; in the heat exchange process, reaction temperature T n rises, and real-time oil temperature T O falls; finally, real-time oil temperature T o and reaction temperature T n reach equilibrium; then, the reaction temperature is kept constant through an oil temperature machine control. In the oil bath heating process of improving the vanadium oxide wet extraction expansion test platform leaching process, the application improves the reaction material heating speed in the reaction kettle, and the reaction temperature is raised to the target temperature in the shortest time.

Description

Technical Field

[0001] This invention relates to the field of oil bath heating model algorithms for wet vanadium extraction, and more specifically, to an oil bath heating method for a pilot-scale test platform for wet vanadium oxide extraction. Background Technology

[0002] The wet vanadium extraction process is mainly divided into acid leaching and alkaline leaching. The main processes include vanadium leaching, solid-liquid separation, purification of the leachate, and vanadium salt precipitation. The wet vanadium extraction leaching process usually needs to be carried out at a temperature of 50-60℃, therefore the reactants in the reactor need to be heated and kept at that temperature.

[0003] The current vanadium oxide wet extraction pilot-scale platform uses oil bath heating for the leaching process reactor. A simplified diagram of oil bath heating is shown below. Figure 2 As shown, the heat transfer oil is first heated by an oil temperature controller, and then the heated oil is pumped to the jacket of the reactor to exchange heat with the reactants inside the reactor. The cooled oil is then pumped back to the oil temperature controller for heating, thus realizing the circulation heating of the heat transfer oil and thereby raising the temperature of the materials inside the reactor.

[0004] Current oil bath heating methods set the temperature of the heat transfer oil to match the target reaction temperature. Once the heat transfer oil reaches the target temperature, its temperature stops rising and fluctuates slightly around the set temperature. This oil bath heating control method results in an excessively small temperature difference between the heat transfer oil and the material, causing a slow rate of temperature increase in the reaction and severely impacting vanadium extraction efficiency. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose an oil bath heating method for a vanadium oxide wet extraction pilot test platform, so as to solve the technical problem that the reaction temperature rises slowly during heating in existing oil bath heating methods.

[0006] The technical means employed in this invention are as follows:

[0007] A method for wet extraction of vanadium oxide using an oil bath heating platform includes the following steps:

[0008] Set the reaction values, calculate the heat transfer coefficient C, derive the relationship between C and V based on the heat transfer coefficient C, and calculate the limiting temperature T based on the relationship between C and V. e ;

[0009] Turn on the heater and heat the heat transfer oil to the limit temperature T. e The extreme temperature T e Greater than the set temperature T s ;

[0010] When the real-time oil temperature T o Greater than T eWhen the heater is turned off, the heat transfer oil continues to circulate and exchange heat with the reactor through the oil pump.

[0011] The reaction temperature T during the heat exchange process n The oil temperature rises, and the real-time oil temperature T... O decline;

[0012] As heat exchange proceeds, the final real-time oil temperature T o With reaction temperature T n Achieving balance;

[0013] The equilibrium temperature is less than or equal to the set temperature T. s The reaction temperature T is then maintained by an oil temperature controller. n Constant.

[0014] Furthermore, the limiting temperature T e The expression is as follows:

[0015]

[0016] Where V is the volume of the reactants.

[0017] Furthermore, when T o equal to T e At that time, T o >T s >T n .

[0018] Furthermore, the heat transfer coefficient C during the process of heat exchange between the heat transfer oil and the reactants to reach equilibrium is given by the following formula:

[0019] CΔo≤Δm

[0020] Δo=T e -T S

[0021] Δm=T s -T n

[0022] Where: Δo represents the temperature of the heat transfer oil from the limiting oil temperature T e Drop to the set temperature T s The amount of heat consumed; Δm represents the amount of reactants from the current temperature T. n Rise to the set oil temperature T s The heat absorbed.

[0023] Furthermore, the reaction values ​​include a set temperature T. s and the volume V of the reactants.

[0024] The present invention also provides a storage medium comprising a stored program, wherein, when the program is executed, it performs any of the above-described methods for the wet extraction of vanadium oxide using an oil bath heating method for pilot testing.

[0025] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes any of the above-described vanadium oxide wet extraction pilot test platform oil bath heating methods through the computer program.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The purpose of this invention is to improve the heating rate of the reactants in the reaction vessel during the oil bath heating process of the leaching step in the vanadium oxide wet extraction pilot test platform, raising the reaction temperature to the target temperature in the shortest possible time. This improves reaction heating efficiency while reducing energy consumption, ultimately achieving the goal of improving efficiency and reducing costs.

[0028] This invention compares the heating effects of two heating models under different reactant volumes through experiments, recording the heating time from 25°C to 60°C for both the original and the present invention's heating models. The comparison shows that the original heating model requires an average of 6842 seconds for oil bath heating, while the present invention's heating model requires an average of 2491 seconds, representing an average increase in heating rate of 175.63%. This significantly improves the oil bath heating efficiency of the leaching process and greatly saves researchers' experimental time. Simultaneously, the present invention's heating model can achieve a rapid temperature rise in a shorter time, resulting in less heat loss compared to the original heating model, thus achieving the effect of improving efficiency and reducing costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating the heating process of the present invention.

[0031] Figure 2 This is a simplified diagram of the oil bath heating system of the present invention.

[0032] Figure 3 This is a function fitting curve of the heat transfer coefficient C of the heating model of the present invention.

[0033] Figure 4 This is a graph showing the trend of heat transfer oil and reaction temperature changing over time during the heating process of the original heating mold.

[0034] Figure 5 This is a graph showing the trend of heat transfer oil and reaction temperature changing over time during the heating process of the heating mold in this invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] In this invention, the symbols have the following meanings: V is the volume of the reactants; T s To set the reaction temperature; T n T represents the current reaction temperature. p This is the oil temperature setpoint; T e The limiting oil temperature; T o The current oil temperature is C; C is the heat transfer coefficient.

[0038] like Figure 1 As shown, this invention provides an oil bath heating method for a vanadium oxide wet extraction pilot test platform. The theoretical derivation process is as follows:

[0039] Through analysis Figure 4 It can be observed that the reaction temperature T during heating in the original heating model is... n The main reason for the slow increase in temperature is that the heat transfer oil stops heating after reaching the set temperature and remains constant. This results in a small temperature difference between the heat transfer oil and the reaction temperature during subsequent heat exchange with the reactants, ultimately causing the reaction temperature to rise slowly.

[0040] For this reason, a new heating model is proposed: firstly, the heat transfer oil is heated to a limiting temperature T.e And the limiting temperature T e It should be higher than the set temperature T s When the oil temperature T o >T e When the heater is turned off, the hot oil continues to circulate and exchange heat with the reactor through the oil pump. During the heat exchange process, the reaction temperature T n As the temperature rises, the temperature of the heat transfer oil decreases, and as heat exchange continues, the final oil temperature T... o and reaction temperature T n The system will reach equilibrium at a certain temperature, and the equilibrium temperature must be equal to or less than a set temperature T. s The reaction temperature is then kept constant by an oil temperature controller.

[0041] Because the oil temperature controller has a large heating power, the oil temperature T... o The rate of increase will be much greater than the reaction temperature T. n The rate of ascent, therefore at the heat transfer oil temperature T o >T e At that time, T will appear. o >T s >T n The situation when T o >T e After the heater is turned off, assuming that there exists a heat transfer coefficient C during the process of heat exchange between the heat transfer oil and the reactants to reach equilibrium, such that:

[0042] CΔo≤Δm

[0043] Δo=T e -T S

[0044] Δm=T s -T n

[0045] Where: Δo: represents the temperature of the heat transfer oil from the extreme oil temperature T e Drop to the set temperature T s The amount of heat consumed;

[0046] Δm: represents the reactant temperature from the current temperature T n Rise to the set oil temperature T s The heat absorbed;

[0047] The above analysis can be summarized into the following formula:

[0048] C(T e -T s )≤T s -T n

[0049] Further analysis revealed:

[0050]

[0051] Therefore, T needs to be found. e We only need to find the heat transfer coefficient C.

[0052] The relationship between the heat transfer coefficient C and the volume V was fitted through experiments, and the fitted curve is shown below. Figure 3 As shown.

[0053] Fitting expression: f(X)=P1X 3 +P2X 2 +P3X+P4

[0054] Meaning of parameters in the fitting expression: P1 = -2.889e -5 ;P2=0.003771;P3=-0.1675;P4=3.381

[0055] Substituting the heat transfer coefficient C and the volume V, we get the final expression: C = -2.889e -5 V 3 +0.003771V 2 -0.1675V +3.381

[0056] The final T is derived from the above formula. e The expression:

[0057]

[0058] The present invention also provides a storage medium comprising a stored program, wherein, when the program is executed, the vanadium oxide wet extraction expansion test platform oil bath heating method is performed.

[0059] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the vanadium oxide wet extraction expansion test platform oil bath heating method through the computer program.

[0060] Example

[0061] The mathematical expression of the heating model of this invention is written into the ladder diagram program and downloaded to the PLC using Siemens TIA Portal STEP7 software. The PLC is then interacted with via WINCC configuration software to control the start and stop of the oil pump and heater, set the temperature and volume, and monitor the operating status and related parameter values ​​of the equipment.

[0062] First, set the reaction temperature T. s And reactant volume V, the model will be based on T s V and T n T is calculated using formula (1) eAt this point, the oil temperature will be automatically set to T. e That is, T p =T e Then start the oil pump and heater, oil temperature T. o As it rises, the model will calculate T in real time. e The value of T. Due to the oil temperature T. o As the reaction temperature T rises, n It also rises accordingly, therefore, according to the model formula, T n An increase will cause T e Dynamic decrease. Therefore, when T o >T e At that time, the oil temperature will be automatically set to T. s That is, T p =T s At this time, T o >T p The heater is turned off, but the oil pump continues to circulate. Finally, the heat transfer oil continues to exchange heat with the reactants until their temperatures reach equilibrium (when T...). e When the maximum value is reached, the equilibrium temperature will be approximately equal to the set temperature T. s The subsequent reaction is controlled by an oil temperature controller to maintain a constant temperature in the heat transfer oil, thereby maintaining a constant temperature in the reactor.

[0063] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0064] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0066] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0067] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0068] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for oil bath heating in a pilot-scale test platform for wet extraction of vanadium oxide, characterized in that, Includes the following steps: Set the reaction values ​​according to the process parameters and calculate the heat transfer coefficient. According to the heat transfer coefficient get and V The relation, according to and V Relationship calculation of limit temperature ; The extreme temperature The expression is as follows: in, V The volume of the reactants; Turn on the heater and heat the heat transfer oil to its maximum temperature. The extreme temperature greater than the set temperature ; When the real-time oil temperature When the heater is turned off, the heat transfer oil continues to circulate and exchange heat with the reactor through the oil pump. Reaction temperature during heat exchange The oil temperature rises simultaneously. T O decline; As heat exchange proceeds, the final real-time oil temperature... With reaction temperature Achieving balance; The temperature at equilibrium is less than or equal to the set temperature. The reaction temperature is then maintained by an oil temperature controller. Constant.

2. The vanadium oxide wet extraction expansion platform oil bath heating method according to claim 1, characterized in that, when hour, .

3. The oil bath heating method for the vanadium oxide wet extraction pilot test platform according to claim 1, characterized in that, The heat transfer coefficient during the process of heat exchange between the heat transfer oil and the reactants to reach equilibrium is: , The formula is as follows: in: This indicates the heat transfer oil from its extreme oil temperature. Drop to the set temperature The amount of heat consumed; Indicates the reactants from the current temperature Rise to the set oil temperature The heat absorbed.

4. The oil bath heating method for the vanadium oxide wet extraction pilot test platform according to claim 1, characterized in that, The reaction values ​​include the set temperature. and reactant volume V .

5. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the oil bath heating method for the vanadium oxide wet extraction pilot test platform as described in any one of claims 1 to 4 is performed.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the oil bath heating method for vanadium oxide wet extraction pilot test platform according to any one of claims 1 to 4 through the computer program.

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