Temperature control and heating method, device, computer equipment and medium for variable liquid level tank

Abstract

The present invention relates to the technical field of temperature control and heating, and discloses a temperature control and heating method, device, computer equipment and medium for a variable liquid level material tank. The method comprises: when heating the variable liquid level material tank, constructing a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank; constructing a temperature control model based on the principle of convection heat transfer between the inner wall of the tank and the fluid in the tank and the relationship model; the temperature control model is a temperature control model including the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank; controlling the start or stop of the heating of the variable liquid level material tank based on the relationship between the first temperature of the outer wall of the tank and a first preset temperature threshold value in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and a second preset temperature threshold value in the temperature control model, thereby controlling the heating temperature of the variable liquid level material tank. The present invention solves the problem that the temperature of the inner wall of the tank cannot be directly controlled, resulting in the inability to control the temperature of the tank body as the liquid level changes.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control and heating, and in particular to a temperature control and heating method, device, computer equipment and medium for a variable liquid level material tank. Background Art

[0002] Currently, it is difficult to control the temperature of liquid processing containers / tanks (single-wall) that only have heating but no cooling. It cannot be adjusted by the commonly used PID controller. It can only be controlled by on-off. When the temperature is slightly higher than the set value, the heating will stop. Therefore, higher requirements are placed on the heating operation of liquid processing containers / tanks:

[0003] 1) If the temperature of the fluid in the container is required not to exceed the set temperature to avoid over-temperature cracking or deterioration of the liquid in the container, the temperature of the fluid in the tank must be strictly controlled within the set temperature and cannot exceed the set temperature within +1°C.

[0004] 2) The heater itself needs to heat up quickly and have high heating efficiency. Therefore, the heater itself needs to be durable and have a long lifespan, otherwise the heater will easily be damaged.

[0005] In addition, for electric heating of this type of tank (without cooling), the temperature of the fluid in the tank must be kept basically constant. Moreover, as the liquid level in the tank changes up and down, the temperature of the inner wall of the tank cannot be directly measured and controlled. Therefore, the temperature of the inner wall of the tank cannot be controlled.

[0006] Based on the above problems, a temperature control and heating method for a liquid tank is urgently needed. Summary of the Invention

[0007] In view of this, the present invention provides a temperature control and heating method, device, computer equipment and medium for a variable liquid level material tank to solve the problem that the temperature of the inner wall of the tank cannot be directly measured and controlled, resulting in the tank temperature being unable to be controlled as the liquid level changes.

[0008] In a first aspect, the present invention provides a temperature control and heating method for a variable liquid level tank, wherein the variable liquid level tank includes a tank body, a fluid is contained in the tank body, and the tank body includes an outer tank wall and an inner tank wall. The temperature control and heating method includes:

[0009] When the variable level tank is heated, a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank;

[0010] A temperature control model is constructed based on the convection heat transfer principle and relationship model between the inner wall of the tank and the fluid in the tank; the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank;

[0011] Based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the start or stop of the variable liquid level tank heating is controlled to control the heating temperature of the variable liquid level tank.

[0012] The temperature control and heating method of the variable liquid level material tank provided by the present invention, when heating the variable liquid level material tank, constructs a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank, and constructs a temperature control model based on the convection heat transfer principle and the relationship model between the inner wall of the tank and the fluid in the tank; the temperature control model is a temperature control model including the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank; based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the start or stop of the heating of the variable liquid level material tank is controlled to control the heating temperature of the variable liquid level material tank, and the temperature control model is used to convert the unmeasurable inner wall temperature of the tank into the relationship model between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank, thereby realizing the indirect temperature control purpose of the linkage between the temperature of the tank fluid and the preset threshold of the outer wall temperature of the tank, and solving the problem that the temperature of the inner wall of the tank cannot be directly measured and the temperature of the inner wall of the tank cannot be directly controlled, resulting in the tank temperature cannot be controlled as the liquid level changes.

[0013] In an optional embodiment, constructing a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank includes:

[0014] Determine a first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank;

[0015] Obtaining the first temperature of the outer wall of the tank, the outer wall radius of the tank, and the inner wall radius of the tank;

[0016] A relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the first heat transferred from the outer wall of the tank to the inner wall of the tank, the first temperature of the outer wall of the tank, the radius of the outer wall of the tank and the radius of the inner wall of the tank.

[0017] In an optional embodiment, the variable liquid level tank further includes a stirring shaft disposed in the middle of the tank body; and determining the first heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank includes:

[0018] Obtain the tank height, the distance from the center of the stirring shaft to the outer wall of the tank, and the thermal conductivity of the variable liquid level tank;

[0019] Calculate the heat transfer area from the outer wall of the tank to the inner wall of the tank based on the height of the tank and the distance from the center of the stirring shaft to the outer wall of the tank;

[0020] The first amount of heat transferred from the outer wall of the tank to the inner wall of the tank is calculated based on the heat transfer area and the thermal conductivity of the variable liquid level tank.

[0021] The temperature control and heating method of the variable liquid level material tank provided by the present invention determines the first heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank; obtains the radius of the outer wall of the tank and the radius of the inner wall of the tank; constructs a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the first heat transferred from the outer wall of the tank to the inner wall of the tank, the radius of the outer wall of the tank and the radius of the inner wall of the tank, and uses the relationship model to reflect the relationship between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank, providing a basis for subsequent construction of a temperature control model.

[0022] In an optional embodiment, constructing a temperature control model based on the convection heat transfer principle from the inner wall of the tank to the fluid in the tank and the relationship model includes:

[0023] Obtaining a first temperature of the fluid in the tank, a radius of the tank inner wall, a convection heat transfer coefficient from the tank inner wall to the fluid in the tank, and a percentage value of a liquid level height of the fluid in the tank;

[0024] Calculate the second amount of heat transferred from the inner wall of the tank to the fluid in the tank based on the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient, and the percentage of the liquid level height;

[0025] Based on the principle of energy conservation, a temperature control model is constructed according to the relationship model and the second heat.

[0026] The temperature control and heating method for a variable liquid level tank provided by the present invention uses a temperature control model to convert the unmeasurable tank inner wall temperature into a relationship model between the first temperature of the tank outer wall and the first temperature of the fluid in the tank, providing a theoretical model basis for accurately controlling the heating temperature of the fluid in the tank.

[0027] In an optional embodiment, controlling the start or stop of the variable liquid level tank heating based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model to control the heating temperature of the variable liquid level tank includes:

[0028] When the first temperature of the outer wall of the tank is greater than the first preset temperature threshold, or the first temperature of the fluid in the tank is greater than the second preset temperature threshold, the heating of the variable level material tank is stopped;

[0029] When the first temperature of the outer wall of the tank is lower than the first preset temperature threshold, and at the same time the first temperature of the fluid in the tank is lower than the second preset temperature threshold, the heating variable level tank is turned on.

[0030] The temperature control and heating method of the variable liquid level material tank provided by the present invention stops heating the variable liquid level material tank when the first temperature of the outer wall of the tank body is greater than the first preset temperature threshold, or the first temperature of the fluid in the tank body is greater than the second preset temperature threshold; starts heating the variable liquid level material tank when the first temperature of the outer wall of the tank body is less than the first preset temperature threshold, and at the same time the first temperature of the fluid in the tank body is less than the second preset temperature threshold, to ensure that the surface of the inner wall of the tank body that contacts the fluid does not exceed the preset temperature threshold, to ensure that the temperature of the fluid in the tank body is basically constant, and to achieve precise temperature control of the fluid in the tank body.

[0031] In an optional embodiment, the temperature control model first coefficient and the second coefficient, the temperature control heating method further includes:

[0032] The first coefficient and the second coefficient are corrected by adopting a self-learning method.

[0033] In an optional implementation, correcting the first coefficient and the second coefficient in a self-learning manner includes:

[0034] Measuring a second temperature of the outer wall of the tank, a second temperature of the fluid in the tank, and a percentage value of the liquid level height of the fluid in the tank;

[0035] The second temperature of the outer wall of the tank, the second temperature of the fluid in the tank, and the percentage value of the liquid level height of the fluid in the tank are substituted into the temperature control model to calculate the first coefficient and the second coefficient.

[0036] The temperature control and heating method for a variable liquid level tank provided by the present invention uses a self-learning method to correct the first coefficient and the second coefficient in the temperature control model, making the expression of the temperature control model more accurate and improving the control accuracy of the temperature control model.

[0037] In a second aspect, the present invention provides a temperature control and heating device for a variable liquid level tank, the device comprising:

[0038] The first construction module is used to construct a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank when the variable liquid level tank is heated;

[0039] The second construction module is used to construct a temperature control model based on the convection heat transfer principle from the inner wall of the tank to the fluid in the tank and the relationship model; the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank;

[0040] A control module is used to control the start or stop of the variable liquid level tank heating based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, so as to control the heating temperature of the variable liquid level tank.

[0041] In a third aspect, the present invention provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the temperature control and heating method for a variable liquid level tank according to the first aspect or any corresponding embodiment thereof.

[0042] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the temperature control and heating method for a variable liquid level tank according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 1 is a flow chart of a temperature control and heating method for a variable liquid level tank according to an embodiment of the present invention;

[0045] Figure 2 1 is a flow chart of another temperature control and heating method for a variable liquid level tank according to an embodiment of the present invention;

[0046] Figure 3 1 is a flow chart of another method for controlling and heating a variable liquid level tank according to an embodiment of the present invention;

[0047] Figure 4 is a schematic diagram of a variable liquid level tank heating model according to an embodiment of the present invention;

[0048] Figure 5 is a schematic diagram of heating control hardware according to an embodiment of the present invention;

[0049] Figure 6 is a schematic diagram of heating control logic according to an embodiment of the present invention;

[0050] Figure 7 2 is a structural block diagram of a temperature control and heating device for a variable liquid level tank according to an embodiment of the present invention;

[0051] Figure 8 Schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0053] During the electrical heating (without cooling) of liquid processing containers / tanks, the temperature of the fluid within the tank must be kept essentially constant. However, as the fluid level within the tank fluctuates, the temperature of the tank's inner wall cannot be directly measured or controlled, resulting in an inability to control the temperature of the fluid within the tank. Therefore, the present invention provides a temperature control and heating method for a variable-level tank, addressing the issue of being unable to directly measure and control the tank's inner wall temperature, which results in an inability to control the tank's inner wall temperature.

[0054] According to an embodiment of the present invention, an embodiment of a temperature control and heating method for a variable liquid level tank is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0055] In this embodiment, a temperature control and heating method for a variable liquid level tank is provided, which can be used in a PLC controller. The variable liquid level tank includes a tank body 3 (which can be cylindrical), in which a fluid is contained, and the tank body includes a tank outer wall 12 and a tank inner wall 11. Figure 1 FIG. 1 is a flow chart of a temperature control and heating method for a variable liquid level tank according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0056] Step S101 , when the variable liquid level tank is heated, a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank.

[0057] Specifically, Figure 4 Schematic diagram of a variable level tank heating model according to an embodiment of the present invention. Figure 4As shown, the variable liquid level tank also includes an electric heating plate 6 of the heating layer, a probe 1 inside the heating plate, a temperature measuring probe 2 installed on the outer wall of the tank body, a temperature measuring probe, a liquid temperature probe mounting tube 5, an insulation layer and armor 7, and a capacitive liquid level probe 9. The electric heating plate 6 of the heating layer is fixedly mounted on the outer side of the tank body outer wall 12 with a snap and surrounds the outer wall 12 of the tank body. The probe 1 inside the heating plate is embedded in the electric heating plate 6, and the temperature measuring probe is installed in the liquid temperature probe mounting tube 5. During the heating process, an insulation layer and armor 7 are installed on the outer side of the tank body outer wall 12, and the capacitive liquid level probe 9 is installed in the tank body perpendicular to the bottom of the tank body to measure the liquid level height of the fluid in the tube body. An insulation layer and armor 7 are installed on the outside of the heating layer, so when measuring the temperature during the heating process, the heat dissipation of the tank body 3 to the external environment is not considered first.

[0058] The principle of heat conduction refers to the process of transferring heat inside a substance. During heating, the principle of heat conduction from the outer wall of the tank to the inner wall of the tank refers to the process of transferring heat from the outer wall of the tank to the inner wall of the tank. The amount of heat transferred is also related to the radius of the inner wall of the tank and the radius of the outer wall of the tank. When the electric heating plate of the heating layer begins to heat the variable liquid level material tank, the first temperature of the outer wall of the tank refers to the first temperature T2 of the outer wall of the tank actually measured by the temperature measuring probe 2 installed on the outer wall of the tank. The temperature of the inner wall of the tank is set to T3. Since the temperature T3 of the inner wall of the tank cannot be measured, it is necessary to obtain the amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank. According to the amount of heat transferred from the outer wall of the tank to the inner wall of the tank, the radius of the inner wall of the tank and the radius of the outer wall of the tank, the relationship expression between the first temperature T2 of the outer wall of the tank and the temperature T3 of the inner wall of the tank is obtained to represent the temperature T3 of the inner wall of the tank. This expression is used as a model for the relationship between the first temperature T2 of the outer wall of the tank and the temperature T3 of the inner wall of the tank. Since the liquid level of the fluid in the tank changes with the injection level of the liquid, the first temperature T2 of the outer wall of the tank and the temperature T3 of the inner wall of the tank will also change, providing a basis for subsequent control of the tank heating temperature according to the preset threshold.

[0059] Step S102 , constructing a temperature control model based on the convection heat transfer principle and relationship model between the inner wall of the tank and the fluid in the tank; the temperature control model is a temperature control model including the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank.

[0060] Specifically, the principle of convective heat transfer refers to the heat transfer process that occurs when a fluid directly contacts a solid wall. This refers to the heat transfer process that occurs when the inner wall of the tank contacts the fluid within the tank. The tank's inner wall temperature is currently T3. Based on the principle of convective heat transfer between the inner wall and the fluid within the tank, the amount of heat transferred during contact between the inner wall and the fluid within the tank can be calculated. Because an insulation layer and armor 7 are installed outside the heating layer, heat dissipation from the tank 3 to the external environment is not considered when measuring the temperature during the heating process. According to the principle of conservation of energy, the heat transferred from the outer wall of the tank to the inner wall of the tank is equal to the heat transferred when the inner wall of the tank contacts the fluid in the tank. At this time, the first temperature of the fluid in the tank measured by the temperature probe installed in the liquid temperature probe installation tube 5 is T4. According to the heat transferred when the inner wall of the tank contacts the fluid in the tank and the inner wall temperature T3 and the first temperature T4 of the fluid in the tank, the relationship expression between the inner wall temperature T3 and the first temperature T4 of the fluid in the tank is obtained. The inner wall temperature T3 of the tank is replaced by the relationship model expression. The relationship expression between the inner wall temperature T3 and the first temperature T4 of the fluid in the tank is converted into the relationship expression between the first temperature T2 of the outer wall of the tank and the first temperature T4 of the fluid in the tank. The relationship expression between the first temperature T2 of the outer wall of the tank and the first temperature T4 of the fluid in the tank is used as the temperature control model.

[0061] Step S103, based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the start or stop of the variable liquid level tank heating is controlled to control the heating temperature of the variable liquid level tank.

[0062] Figure 5 is a schematic diagram of the heating control hardware according to an embodiment of the present invention, such as Figure 5 As shown, the control hardware includes a temperature controller 1#, a PLC (Programmable Logic Controller), an intermediate relay and a contactor. The intermediate relay includes a first coil Ks, and the electric heating plate control contactor includes a second coil KM. The electric heating plate 6 of the heating layer is equivalent to a resistor R. A normally closed point K1 is provided in the temperature controller 1#. The first coil Ks of the intermediate relay is connected to the digital output point Q2 of the PLC controller. The second coil KM of the electric heating plate control contactor is respectively connected to the normally closed point K1 of the temperature controller 1# and the equivalent resistor R of the electric heating plate 6 of the heating layer.

[0063] The control logic of the PLC controller for the electric heating plate 6 of the heating layer is: the actual temperature of the heating plate measured by the probe 1 inside the heating plate is T1. When the actual temperature T1 of the electric heating plate exceeds the temperature threshold Tp1 set by the electric heating plate, the normally closed point K1 in the thermostat 1# is disconnected, and then the second coil KM of the electric heating plate control contactor is naturally disconnected, and the electric heating plate is controlled to stop heating.

[0064] The heating control logic of the digital output point Q2 of the PLC controller is as follows: Figure 6 As shown, when the first temperature T2 of the outer wall of the tank is less than or equal to the first preset temperature threshold Tp2, and the first temperature T4 of the fluid inside the tank is less than or equal to the second preset temperature threshold Tp4, the digital output point Q2 of the PLC controller will output a control command (+24V). The first temperature T2 of the outer wall of the tank and the first temperature T4 of the fluid inside the tank are the actual values ​​input by the temperature probe through the analog input module of the PLC. If Figure 6 According to the control logic shown, the digital output point Q2 of the PLC controller has an output (+24v), which controls Ks to be energized. At this time, if the temperature T1 of the electric heating plate 6 of the heating layer is less than the set temperature threshold Tp1, the normally closed point K1 provided in the temperature controller 1# remains in the on state, and the second coil KM of the electric heating plate control contactor is energized and the equivalent resistance R of the electric heating plate 6 of the heating layer is heated. That is, when the first temperature T2 of the outer wall of the tank in the temperature control model is less than or equal to the first preset temperature threshold Tp2 and the first temperature T4 of the fluid in the tank body in the temperature control model is less than or equal to the second preset temperature threshold Tp4, the electric heating plate 6 of the heating layer is controlled to perform a heating operation.

[0065] When the first temperature T2 of the outer wall of the tank in the temperature control model is greater than the first preset temperature threshold Tp2, or the first temperature T4 of the fluid in the tank in the temperature control model is greater than the second preset temperature threshold Tp4, the electric heating plate 6 of the heating layer is controlled to stop the heating operation.

[0066] The temperature control and heating method of the variable liquid level tank provided in the present embodiment, when heating the variable liquid level tank, a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is obtained based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank, and a temperature control model is constructed based on the principle of convective heat transfer from the inner wall of the tank to the fluid in the tank and the relationship model; the temperature control model is a temperature control model including the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank; based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the start or stop of the heating of the variable liquid level tank is controlled to control the heating temperature of the variable liquid level tank, and the temperature control model is used to convert the unmeasurable tank inner wall temperature into the relationship model between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank, thereby achieving the purpose of indirect temperature control by linking the tank fluid temperature with the preset threshold of the tank outer wall temperature, and solving the problem that the temperature of the inner wall of the tank cannot be directly measured and the inner wall temperature of the tank cannot be directly controlled, resulting in the tank temperature being uncontrollable as the liquid level changes.

[0067] In this embodiment, a temperature control and heating method for a variable liquid level tank is provided, which can be used in a PLC controller. Figure 2FIG. 1 is a flow chart of a temperature control and heating method for a variable liquid level tank according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0068] Step S201 , when the variable liquid level tank is heated, a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is obtained based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank.

[0069] Specifically, the above step S201 includes:

[0070] Step S2011: determining a first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank.

[0071] In some optional embodiments, such as Figure 4 As shown, the variable liquid level tank further includes a stirring shaft 4 arranged in the middle of the tank body, and the above step S2011 includes:

[0072] Step a1: Obtain the tank height, the distance from the center of the stirring shaft to the outer wall of the tank, and the thermal conductivity of the variable liquid level tank.

[0073] Specifically, the thermal conductivity of the variable level tank is the thermal conductivity of the electric heating plate 6 of the heating layer , the thermal conductivity of the electric heating plate 6 It is related to the thermal conductivity and density of the electric heating plate 6. The distance from the center of the stirring shaft to the outer wall of the tank refers to the height of the tank that can be obtained by the stirring shaft using relevant technology. , the distance r1 from the center of the stirring shaft to the outer wall of the tank and the thermal conductivity of the variable level tank .

[0074] Step a2: Calculate the heat transfer area from the outer wall of the tank to the inner wall of the tank based on the height of the tank and the distance from the center of the stirring shaft to the outer wall of the tank.

[0075] Specifically, assuming that the heat transfer area from the outer wall of the tank to the inner wall of the tank is A1, the expression for the heat transfer area A1 from the outer wall of the tank to the inner wall of the tank is as follows:

[0076] (1)

[0077] in: is the distance from the center of the stirring shaft to the outer wall of the tank, is the tank height.

[0078] Step a3: Calculate the first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the heat transfer area and the thermal conductivity of the variable liquid level tank.

[0079] Specifically, suppose the first heat transferred from the outer wall of the tank to the inner wall of the tank is 1. The first heat transferred from the outer wall of the tank to the inner wall of the tank The expression is as follows:

[0080] (2)

[0081] in: is the thermal conductivity of the electric heating plate of the heating layer, represents the first heat transferred through the heat transfer area A1 from the outer wall of the tank to the inner wall of the tank, t represents the temperature parameter, Represents the temperature gradient on the heat transfer area A1.

[0082] Step S2012: Obtain the first temperature of the outer wall of the tank, the radius of the outer wall of the tank, and the radius of the inner wall of the tank.

[0083] Specifically, a first temperature T2 of the tank's outer wall is obtained using a temperature measuring probe 2 installed on the tank's outer wall. The outer and inner wall radii of the tank are obtained using relevant techniques. For example, the outer and inner wall radii r2 and r3 can be measured using a circumference measuring tape method. The circumference measuring tape method involves placing a steel tape measure against the tank to measure horizontal cross-sections at different locations on each ring plate of the tank, measuring their circumference and thereby determining the inner diameter of the ring plate.

[0084] Step S2013 , based on the first heat transferred from the outer wall to the inner wall of the tank, the first temperature of the outer wall of the tank, the radius of the outer wall of the tank, and the radius of the inner wall of the tank, a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is calculated.

[0085] Specifically, integrating formula (2) once yields the following formula:

[0086] (3)

[0087] Combined with the first temperature T2 of the outer wall of the tank, taking the position of the inner wall temperature T3 of the tank as the initial position, substituting r1=r3 into formula (3), the relationship model between the first temperature T2 of the outer wall of the tank and the inner wall temperature T3 of the tank can be obtained:

[0088] (4)

[0089] Among them: Φ1 can also be expressed as: , A 2 is the area of ​​the electric heating plate of the heating layer outside the tank, is the height of the electric heating plate of the heating layer, q is the area through which A 2 heat flux density (unit: W / m 2 , watts / square meter).

[0090] Step S202 , constructing a temperature control model based on the convection heat transfer principle and relationship model between the inner wall of the tank and the fluid in the tank; the temperature control model is a temperature control model including the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank.

[0091] Specifically, if Figure 4 As shown, the tank body further includes a stirring paddle, which is arranged at the bottom of the tank body and is used in conjunction with the stirring shaft to stir the fluid in the tank body so that the fluid is heated evenly. The above step S202 includes:

[0092] Step S2021, obtaining the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient from the inner wall of the tank to the fluid in the tank, and the percentage value of the liquid level height of the fluid in the tank.

[0093] Specifically, a temperature probe installed in the liquid temperature probe mounting tube 5 measures the first temperature T4 of the fluid within the tank. The convective heat transfer coefficient is closely related to the physical properties of the fluid during the heat exchange process, the shape and location of the heat exchange surface, and the flow rate of the fluid, and is determined based on actual measurements. The percentage of the fluid level within the tank is measured by a capacitive level probe 9. The tank inner wall radius r3 is obtained using related techniques.

[0094] Step S2022: Calculate the second amount of heat transferred between the inner wall of the tank and the fluid in the tank based on the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient, and the percentage of the liquid level height.

[0095] Specifically, the heat transfer process between the inner wall of the tank and the fluid inside the tank is described by the Newton cooling formula, which is in the form of:

[0096] 3 (5)

[0097] in: is the convective heat transfer coefficient. Since the stirring speed of the fluid in the stirring tank is uniform and the roughness of the inner wall of the tank is consistent, it is considered that A3=2 r3y, y is the height of the fluid level in the tank; the expression of the heat transfer area A3 is substituted into formula (5) to obtain the second heat transferred between the inner wall of the tank and the fluid in the tank, which is as follows:

[0098] (6)

[0099] Step S2023: Based on the energy conservation principle, a temperature control model is constructed according to the relationship model and the second heat amount.

[0100] Specifically, Ф3 is the second heat transferred through the heat transfer area A3 between the inner wall of the tank and the fluid in the tank, which must satisfy the principle of conservation of energy, so and Equal, let , y = H * p, p is the percentage of the liquid level height of the fluid in the tank, and the liquid level value read from the capacitive liquid level probe 9 (0-100%) is dimensionless. Substituting formula (4) of the relationship model into formula (6) yields the temperature control model:

[0101] h (7)

[0102] The temperature control model can be obtained from the above formula (7):

[0103] (8)

[0104] It can be seen from formula (8) that the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank.

[0105] set up , , then the above formula (8) is transformed into:

[0106] (9)

[0107] in: and represent the first coefficient and the second coefficient of the temperature control model respectively.

[0108] It can be seen from formula (9) that the lower the fluid level in the tank (i.e. The smaller ） When the steady state is reached, the larger the value of the first temperature T2 of the outer wall of the tank is, the higher the liquid level is (i.e. The bigger ）， The closer T2 is to T4+D.

[0109] Step S203: Based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the variable level tank heating is controlled to start or stop, so as to control the heating temperature of the variable level tank. Figure 1 Step S103 of the illustrated embodiment will not be described in detail here.

[0110] The temperature control and heating method of the variable liquid level material tank provided in this embodiment determines the first heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank; obtains the radius of the outer wall of the tank and the radius of the inner wall of the tank; calculates the relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the first heat transferred from the outer wall of the tank to the inner wall of the tank, the radius of the outer wall of the tank and the radius of the inner wall of the tank, uses the relationship model to reflect the relationship between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank, and uses the temperature control model to convert the unmeasurable temperature of the inner wall of the tank into the relationship model between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank, which provides a theoretical model basis for accurately controlling the heating temperature of the fluid in the tank.

[0111] In this embodiment, a temperature control and heating method for a variable liquid level tank is provided, which can be used in the above-mentioned PLC controller. Figure 3 FIG. 1 is a flow chart of a temperature control and heating method for a variable liquid level tank according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0112] Step S301: When the variable level tank is heated, a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is obtained based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank. Figure 2 Step S201 of the illustrated embodiment will not be described in detail here.

[0113] Step S302: Based on the convection heat transfer principle from the inner wall of the tank to the fluid in the tank and the relationship model, a temperature control model is constructed; the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank. Figure 2 Step S202 of the illustrated embodiment will not be described in detail here.

[0114] Step S303, based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the start or stop of the variable level tank heating is controlled to control the heating temperature of the variable level tank

[0115] Specifically, the above step S303 includes:

[0116] Step S3031: When the first temperature of the outer wall of the tank is greater than the first preset temperature threshold, or the first temperature of the fluid in the tank is greater than the second preset temperature threshold, the heating of the variable level tank is stopped.

[0117] When the first temperature T2 of the outer wall of the tank is greater than the first preset temperature threshold Tp2, or the first temperature T4 of the fluid inside the tank is greater than the second preset temperature threshold Tp4, the digital output point Q2 of the PLC controller does not output a control command. The first temperature T2 of the outer wall of the tank and the first temperature T4 of the fluid inside the tank are the actual values ​​input by the temperature probe through the analog input module of the PLC. This does not meet Figure 6 According to the control logic shown, the digital output point Q2 of the PLC controller will not output a control command, and the control Ks will be disconnected. At this time, if the temperature T1 of the electric heating plate 6 of the heating layer is also greater than the set temperature threshold Tp1, the normally closed point K1 set in the temperature controller 1# is in the disconnected state, and the second coil KM of the electric heating plate control contactor is disconnected, and the equivalent resistance R of the electric heating plate 6 of the heating layer is powered off and no heating operation is performed.

[0118] That is, when the first temperature T2 of the outer wall of the tank in the temperature control model is greater than the first preset temperature threshold Tp2, or the first temperature T4 of the fluid in the tank in the temperature control model is greater than the second preset temperature threshold Tp4, the electric heating plate 6 of the heating layer is controlled to stop the heating operation.

[0119] Step S3032: when the first temperature of the outer wall of the tank is lower than the first preset temperature threshold, and the first temperature of the fluid in the tank is lower than the second preset temperature threshold, the heating variable level tank is turned on.

[0120] When the first temperature T2 of the outer wall of the tank is less than or equal to the first preset temperature threshold Tp2, or the first temperature T4 of the fluid inside the tank is less than or equal to the second preset temperature threshold Tp4, the digital output point Q2 of the PLC controller will output a control command. The first temperature T2 of the outer wall of the tank and the first temperature T4 of the fluid inside the tank are the actual values ​​input by the temperature probe through the analog input module of the PLC. If Figure 6 According to the control logic, the digital output point Q2 of the PLC controller outputs a control command to control Ks to be energized. At this time, if the temperature T1 of the electric heating plate 6 of the heating layer is lower than the set temperature threshold Tp1, the normally closed point K1 provided in the temperature controller 1# remains in the on state, and the second coil KM of the electric heating plate control contactor is energized and heated by the equivalent resistance R of the electric heating plate 6 of the heating layer. That is, when the first temperature T2 of the outer wall of the tank in the temperature control model is lower than or equal to the first preset temperature threshold Tp2 and the first temperature T4 of the fluid in the tank body in the temperature control model is lower than or equal to the second preset temperature threshold Tp4, the electric heating plate 6 of the heating layer is controlled to perform a heating operation.

[0121] The temperature control model includes a first coefficient and a second coefficient.

[0122] Step S304: The first coefficient and the second coefficient are corrected using a self-learning method. Because actual conditions differ from ideal theoretical calculations, which simplify many boundary conditions (such as thermal efficiency) or idealize theoretical models, the first and second coefficients in the temperature control model must be corrected in practice based on actual measurement results to obtain a more accurate temperature control model.

[0123] Specifically, the above step S304 includes:

[0124] Step S3041 , measuring the second temperature of the outer wall of the tank, the second temperature of the fluid in the tank, and the percentage value of the liquid level height of the fluid in the tank.

[0125] Specifically, the tank outer wall temperature probe 2 actually measures the second temperature T2' of the tank outer wall at a percentage of the liquid level height of the fluid in the tank. The temperature probe of the liquid temperature probe mounting tube 5 measures the second temperature T4' of the tank fluid at a percentage of the liquid level height of the fluid in the tank. The capacitive liquid level probe 9 measures different percentages of the liquid level height of the fluid in the tank. Based on the actually measured values ​​of T2', T4', and p, the first coefficient C and the second coefficient D in formula (9) are corrected. In theory, only two positions need to be tested—i.e., T2' and T4' at the two percentages of the liquid level height of the fluid in the tank—to calculate the first coefficient C and the second coefficient D.

[0126] Step S3042: Substitute the second temperature of the outer wall of the tank, the second temperature of the fluid in the tank, and the percentage value of the liquid level height of the fluid in the tank into the temperature control model to calculate the first coefficient and the second coefficient.

[0127] Specifically, this step includes the following process:

[0128] 1) Self-learning: Based on the actual measured T2', T4' and p values, the first coefficient C and the second coefficient D in formula (9) are corrected. In theory, only two positions need to be tested - T2' and T4' at the liquid level height percentages of the two fluids in the tank body, to calculate the first coefficient C and the second coefficient D. Specifically,

[0129] a. Place the fluid into the tank to a level that is 1 / 4 of the maximum allowable capacity Hf (Hf is determined based on actual conditions and is not necessarily the maximum height of the tank interior), i.e., Hf / 4. Set Tp1, the first preset temperature threshold Tp2 (the first preset temperature threshold of the tank exterior material), and the second preset temperature threshold Tp4.

[0130] b. Heating the tank, starting the stirring paddle 8 and the stirring shaft 4 in the tank, stirring until the second temperature of the fluid in the tank is T4' ≥ Tp4, at which point the heating is stopped;

[0131] c. Keep T4'=Tp4 and stir for about 10 minutes, record the temperature of T2' at the liquid level percentage of Hf / 4;

[0132] d. Continue to add fluid to 1 / 2 of the maximum allowable capacity Hf of the tank (i.e. Hf / 2), and heat until T4' ≥ Tp4 again;

[0133] e. Continue stirring for about 10 minutes. After the temperature inside the tank is uniform, record the second temperature T2' of the outer wall of the tank at Hf / 2.

[0134] f. Continue to add fluid to the maximum allowable capacity of the tank Hf, heating until the maximum capacity Hf of the tank fluid second temperature T4 '≥ Tp4;

[0135] Continue stirring for about 10 minutes. After the temperature inside the tank is uniform, record the second temperature T2' of the outer wall of the tank under Hf at this time.

[0136] It can be found that each time T2' is recorded, it has exceeded Tp2 by a large range.

[0137] 2) Based on the measured T2', T4' and p values, calculate the first coefficient C and the second coefficient D in the temperature control model formula (9). If necessary, several more sets of tests can be performed. Since C and D are in a linear relationship, a linear fitting method can be used to obtain the most appropriate C and D values.

[0138] 3) According to the complete temperature control model formula (9), in the PLC controller, since the liquid level height percentage can be directly read, the set value of Tp2 can be automatically and timely modified according to the set Tp4 to achieve the purpose of basically constant temperature in the tank.

[0139] The first preset temperature threshold, Tp2, must be lower than the allowable temperature of the tank's outer wall material. If Tp2 is lower than the allowable temperature of the tank's outer wall material, the fluid level in the tank fluctuates during heating, causing the heat capacity of the heating model to change. If the first preset temperature threshold, Tp2, is set to a fixed value, localized overheating can occur after the heater stops heating due to thermal inertia, potentially damaging the heating model.

[0140] In an optional embodiment, when a PLC controller is used for control, a series control statement is added to the control logic to directly connect the temperature T1 of the electric heating plate, the first temperature T2 of the outer wall of the tank, and the first temperature T4 of the fluid in the tank to the digital output point Q2 of the PLC controller, and directly read the values ​​of the above temperatures, which is convenient and simple.

[0141] The temperature control and heating method of the variable liquid level tank provided in this embodiment stops heating the variable liquid level tank when the first temperature of the outer wall of the tank is greater than the first preset temperature threshold, or the first temperature of the fluid in the tank is greater than the second preset temperature threshold; starts heating the variable liquid level tank when the first temperature of the outer wall of the tank is less than the first preset temperature threshold, or the first temperature of the fluid in the tank is less than the second preset temperature threshold, to ensure that the surface of the inner wall of the tank that contacts the fluid does not exceed the preset temperature threshold, to ensure that the temperature of the fluid in the tank is basically constant, to achieve precise temperature control of the fluid in the tank, and to correct the first coefficient and the second coefficient in the temperature control model by self-learning, so that the expression of the temperature control model is more accurate, thereby improving the control accuracy of the temperature control model.

[0142] This embodiment also provides a temperature control and heating device for a variable liquid level tank. The device is used to implement the above-mentioned embodiments and preferred embodiments, and the details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0143] This embodiment provides a temperature control and heating device for a variable liquid level tank, such as Figure 7 Shown, including:

[0144] The first constructing module 701 is used to construct a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank when the variable liquid level tank is heated.

[0145] The second construction module 702 is used to construct a temperature control model based on the convection heat transfer principle from the inner wall of the tank to the fluid in the tank and the relationship model; the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank.

[0146] The control module 703 is used to control the start or stop of the variable liquid level tank heating based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, so as to control the heating temperature of the variable liquid level tank.

[0147] In some optional implementations, the first building block 701 includes:

[0148] a determining unit, configured to determine a first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on a heat conduction principle from the outer wall of the tank to the inner wall of the tank;

[0149] The first acquisition unit is used to acquire a first temperature of the outer wall of the tank, a radius of the outer wall of the tank, and a radius of the inner wall of the tank.

[0150] The first calculation unit is used to build a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the first heat transferred from the outer wall of the tank to the inner wall of the tank, the first temperature of the outer wall of the tank, the radius of the outer wall of the tank and the radius of the inner wall of the tank.

[0151] In some optional implementations, the determining unit includes:

[0152] The acquisition subunit is used to obtain the tank height, the distance from the center of the stirring shaft to the outer wall of the tank, and the thermal conductivity of the variable liquid level tank.

[0153] The first calculation subunit is used to calculate the heat transfer area from the outer wall of the tank to the inner wall of the tank based on the height of the tank and the distance from the center of the stirring shaft to the outer wall of the tank.

[0154] The second calculation subunit is used to calculate the first heat transferred from the outer wall of the tank to the inner wall of the tank based on the heat transfer area and the thermal conductivity of the variable liquid level tank.

[0155] In some optional implementations, the second building block 702 includes:

[0156] The second acquisition unit is used to obtain the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient from the inner wall of the tank to the fluid in the tank, and the percentage value of the liquid level height of the fluid in the tank;

[0157] a second calculation unit for calculating a second amount of heat transferred from the inner wall of the tank to the fluid in the tank based on the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient, and the percentage of the liquid level height;

[0158] The construction unit is used to construct a temperature control model based on the energy conservation principle according to the relationship model and the second heat.

[0159] In some optional implementations, the control module 703 includes:

[0160] a first control unit, configured to stop heating the variable level tank when a first temperature of the outer wall of the tank is greater than a first preset temperature threshold, or when a first temperature of the fluid in the tank is greater than a second preset temperature threshold;

[0161] The second control unit is used to start heating the variable liquid level tank when the first temperature of the outer wall of the tank is lower than the first preset temperature threshold and the first temperature of the fluid in the tank is lower than the second preset temperature threshold.

[0162] The temperature control and heating device of the variable liquid level tank also includes:

[0163] The correction module is used to correct the first coefficient and the second coefficient by adopting a self-learning method.

[0164] In some optional embodiments, the correction module includes:

[0165] a measuring unit, for measuring a second temperature of the outer wall of the tank, a second temperature of the fluid in the tank, and a percentage value of a liquid level height of the fluid in the tank;

[0166] The correction unit is used to substitute the second temperature of the outer wall of the tank, the second temperature of the fluid in the tank and the percentage value of the liquid level height of the fluid in the tank into the temperature control model to calculate the first coefficient and the second coefficient.

[0167] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0168] The temperature control and heating device of the variable liquid level tank in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0169] The embodiment of the present invention also provides a computer device having the above Figure 7 The temperature control and heating device of the variable liquid level tank is shown.

[0170] See also Figure 8 , Figure 8 is a structural diagram of a computer device provided by an optional embodiment of the present invention, such as Figure 8 As shown, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in the memory or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Equally, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0171] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0172] The memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0173] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0174] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0175] The computer device further includes a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0176] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0177] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A temperature control and heating method for a variable liquid level tank, characterized in that: The variable liquid level material tank includes a tank body, a stirring shaft arranged in the middle of the tank body, an electric heating plate, a probe inside the heating plate, a temperature measuring probe installed on the outer wall of the tank body, a liquid temperature probe, a liquid temperature probe mounting tube, an insulation layer and armor, and a capacitive liquid level probe; the electric heating plate is fixedly mounted on the outer side of the outer wall of the tank body with a snap and surrounds the outer wall of the tank body, the probe inside the heating plate is embedded in the electric heating plate, the liquid temperature probe is mounted in the liquid temperature probe mounting tube, the insulation layer and armor are mounted on the outer side of the outer wall of the tank body, the capacitive liquid level probe is mounted in the tank body perpendicular to the bottom of the tank body, a fluid is contained in the tank body, the tank body includes the outer wall of the tank body and the inner wall of the tank body, and the method includes: When the variable level tank is heated, a relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank; A temperature control model is constructed based on the convection heat transfer principle between the inner wall of the tank and the fluid in the tank and the relationship model; the temperature control model is a temperature control model that includes the relationship between the first temperature of the outer wall of the tank and the first temperature of the fluid in the tank; Based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model, the starting or stopping of the variable liquid level tank heating is controlled to control the heating temperature of the variable liquid level tank.

2. The method according to claim 1, characterized in that The relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank, including: Determine a first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank; Obtaining the first temperature of the outer wall of the tank, the outer wall radius of the tank, and the inner wall radius of the tank; A relationship model between the first temperature of the outer wall of the tank and the temperature of the inner wall of the tank is constructed based on the first heat transferred from the outer wall of the tank to the inner wall of the tank, the first temperature of the outer wall of the tank, the radius of the outer wall of the tank and the radius of the inner wall of the tank.

3. The method according to claim 2, characterized in that The determining of the first amount of heat transferred from the outer wall of the tank to the inner wall of the tank based on the heat conduction principle from the outer wall of the tank to the inner wall of the tank includes: Obtain the tank height, the distance from the center of the stirring shaft to the outer wall of the tank, and the thermal conductivity of the variable liquid level tank; Calculate the heat transfer area from the outer wall of the tank to the inner wall of the tank based on the height of the tank and the distance from the center of the stirring shaft to the outer wall of the tank; The first amount of heat transferred from the outer wall of the tank to the inner wall of the tank is calculated based on the heat transfer area and the thermal conductivity of the variable liquid level tank.

4. The method according to claim 1, wherein The temperature control model constructed based on the convection heat transfer principle from the inner wall of the tank to the fluid in the tank and the relationship model includes: Obtaining a first temperature of the fluid in the tank, a radius of the tank inner wall, a convection heat transfer coefficient from the tank inner wall to the fluid in the tank, and a percentage value of a liquid level height of the fluid in the tank; Calculating a second amount of heat transferred between the inner wall of the tank and the fluid in the tank based on the first temperature of the fluid in the tank, the radius of the inner wall of the tank, the convection heat transfer coefficient, and the percentage of the liquid level height; Based on the energy conservation principle, the temperature control model is constructed according to the relationship model and the second heat amount.

5. The method according to claim 1, wherein The controlling of starting or stopping the heating of the variable liquid level tank based on the relationship between the first temperature of the outer wall of the tank and the first preset temperature threshold in the temperature control model or based on the relationship between the first temperature of the fluid in the tank and the second preset temperature threshold in the temperature control model to control the heating temperature of the variable liquid level tank includes: When the first temperature of the outer wall of the tank is greater than the first preset temperature threshold, or the first temperature of the fluid in the tank is greater than the second preset temperature threshold, the heating of the variable level material tank is stopped; When the first temperature of the outer wall of the tank is lower than the first preset temperature threshold, and at the same time the first temperature of the fluid in the tank is lower than the second preset temperature threshold, the heating variable level tank is turned on.

6. A temperature control and heating device for a variable liquid level tank, characterized in that: The variable liquid level material tank includes a tank body, a stirring shaft arranged in the middle of the tank body, an electric heating plate, a probe inside the heating plate, a temperature measuring probe installed on the outer wall of the tank body, a liquid temperature probe, a liquid temperature probe mounting tube, an insulation layer and armor, and a capacitive liquid level probe; the electric heating plate is fixedly mounted on the outer side of the outer wall of the tank body with a snap and surrounds the outer wall of the tank body, the probe inside the heating plate is embedded in the electric heating plate, the liquid temperature probe is mounted in the liquid temperature probe mounting tube, the insulation layer and armor are mounted on the outer side of the outer wall of the tank body, the capacitive liquid level probe is mounted in the tank body perpendicular to the bottom of the tank body, a fluid is contained in the tank body, the tank body includes the outer wall of the tank body and the inner wall of the tank body, and the device includes: The first construction module is used to construct a relationship model between a first temperature of the outer wall of the tank and the temperature of the inner wall of the tank based on the principle of heat conduction from the outer wall of the tank to the inner wall of the tank when the variable liquid level tank is heated; A second construction module is configured to construct a temperature control model based on the principle of convective heat transfer from the inner wall of the tank to the fluid in the tank and the relationship model; the temperature control model is a temperature control model that includes a relationship between a first temperature of the outer wall of the tank and a first temperature of the fluid in the tank; A control module is used to control the start or stop of the variable liquid level tank heating based on the relationship between the first temperature of the outer wall of the tank body and the first preset temperature threshold in the temperature control model, or based on the relationship between the first temperature of the fluid in the tank body and the second preset temperature threshold in the temperature control model, so as to control the heating temperature of the variable liquid level tank.

7. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the temperature control and heating method for a variable liquid level tank according to any one of claims 1 to 5 by executing the computer instructions.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the temperature-controlled heating method for a variable-level tank according to any one of claims 1 to 5.

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