A method, apparatus and device for controlling the temperature gradient of a heat treatment

Abstract

The application provides a method, device and equipment for controlling a temperature gradient of a turnaround heat treatment, and relates to the technical field of heat treatment. The method comprises the following steps: obtaining part of heat treatment process parameters in a furnace and process parameters of an auxiliary heating component outside the furnace; performing simulation test according to the part of heat treatment process parameters in the furnace and the process parameters of the auxiliary heating component outside the furnace, and obtaining a process operation curve of the auxiliary heating component outside the furnace; setting the auxiliary heating component outside the furnace according to a preset position of a simulation auxiliary heating component in the simulation test, wherein the structure of the simulation auxiliary heating component is the same as that of the auxiliary heating component outside the furnace; controlling a part in the furnace to perform heat treatment operation according to the part of heat treatment process parameters in the furnace, and controlling the auxiliary heating component outside the furnace to perform heat treatment operation synchronously with the part in the furnace according to the process operation curve. The application solves the problem of how to quantitatively execute temperature gradient control when a large thick-walled container is subjected to segmented turnaround heat treatment.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, and more specifically, to a method, apparatus, and equipment for controlling the temperature gradient during a turning heat treatment process. Background Technology

[0002] Large, thick-walled pressure vessels are core equipment in petrochemical plants, and their specifications are constantly pushing the limits as the scale of these plants increases. After the entire vessel is welded, post-weld heat treatment is required. However, when the overall length of the vessel exceeds the maximum length of existing heat treatment furnaces, integral heat treatment is not feasible. Currently, there are two methods: local heat treatment and segmented reversal heat treatment. Local heat treatment involves dividing the vessel into several segments and heat-treating them separately, with local heat treatment applied to the closure welds between the segments. Segmented reversal heat treatment involves first heat-treating one segment of the vessel in the furnace, then welding another segment to it, and finally reversing the vessel as a whole for heat treatment. The latter half and the closure weld are located inside the furnace, while the former half is outside. Segmented reversal heat treatment can be completed using only one integral heat treatment furnace, eliminating the need for local heat treatment equipment, and offering certain technological and cost advantages.

[0003] When thick-walled vessels undergo segmented reversal heat treatment, a certain temperature gradient inevitably exists between the portion of the shell extending outside the furnace and the interior of the furnace. If not handled properly, this can generate unfavorable thermal stress. Relevant standards generally require that harmful temperature gradients should not be generated, but quantifiable technical indicators are lacking. Summary of the Invention

[0004] The problem solved by this invention is how to quantitatively implement temperature gradient control when using segmented turning heat treatment in large, thick-walled containers.

[0005] To address the aforementioned problems, this invention provides a method for controlling the temperature gradient in a turning heat treatment process. Based on a large, thick-walled container, the container includes an inner furnace section and an outer furnace section. An external auxiliary heating component is provided at the junction of the inner and outer furnace sections. The method comprises the following steps:

[0006] Obtain the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating components;

[0007] Simulation experiments were conducted based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating component to obtain the process operation curve of the external auxiliary heating component.

[0008] The external auxiliary heating component is set according to the preset position of the simulated auxiliary heating component in the simulation test, and the structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component;

[0009] The furnace interior is controlled to perform heat treatment operations according to the furnace interior heat treatment process parameters, and the external auxiliary heating components are controlled to perform heat treatment operations synchronously with the furnace interior according to the process operation curve.

[0010] Optionally, the external auxiliary heating component includes an auxiliary heating belt and an auxiliary insulation belt. The step of setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test includes:

[0011] Obtain the radius and thickness of the cylinder of the simulated furnace exterior section in the simulation test;

[0012] The dimensions of the simulated auxiliary heating belt and the simulated auxiliary insulation belt of the simulated auxiliary heating component are obtained based on the cylinder radius and the cylinder thickness.

[0013] The simulated auxiliary heating belt is tightly laid on the outer wall of the simulated furnace exterior to obtain a first preset position;

[0014] The simulated auxiliary heat insulation tape is laid on the inner and outer walls of the simulated auxiliary heating tape and the simulated furnace exterior to obtain a second preset position;

[0015] The auxiliary heating belt is set according to the first preset position, and the auxiliary heat preservation belt is set according to the second preset position.

[0016] Optionally, the external auxiliary heating component further includes a monitoring thermocouple, and setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test further includes:

[0017] The simulated monitoring thermocouple of the simulated auxiliary heating component is placed at the middle and edge of the simulated auxiliary heating belt, and positioned between the outer wall of the simulated furnace outer part and the simulated auxiliary heating belt to obtain a third preset position;

[0018] The monitoring thermocouple is set according to the third preset position.

[0019] Optionally, the heat treatment includes a heating stage, the heat treatment process parameters inside the furnace include a target temperature inside the furnace, and controlling the auxiliary heating components outside the furnace to perform heat treatment operations synchronously with the part inside the furnace according to the process operation curve includes:

[0020] When the furnace enters the heating stage, the auxiliary heating belt is controlled to heat up according to the process operation curve.

[0021] When the temperature of the auxiliary heating belt reaches the first preset target temperature, the auxiliary heating belt is controlled to be adjusted to a constant temperature state;

[0022] Wherein, the first preset target temperature is not lower than half of the target temperature inside the furnace.

[0023] Optionally, the heat treatment further includes a heat preservation stage, and the step of controlling the external auxiliary heating component and the internal part of the furnace to perform heat treatment synchronously according to the process operation curve further includes:

[0024] When the furnace interior enters the heat preservation stage, the temperature at the edge of the auxiliary heating belt is controlled to be no lower than the first preset target temperature, and the temperature at the center of the auxiliary heating belt is controlled to be no lower than the second preset target temperature.

[0025] The second preset target temperature is not lower than three-quarters of the target temperature inside the furnace.

[0026] Optionally, the heat treatment further includes a cooling stage, and the step of controlling the external auxiliary heating component and the internal part of the furnace to perform heat treatment operations synchronously according to the process operation curve further includes:

[0027] When the part inside the furnace enters the cooling stage, the auxiliary heating belt is controlled to cool down according to the process operation curve until the end.

[0028] Optionally, the process operation curve includes the process operation curve for the heating stage. The process operation curve of the external auxiliary heating component is obtained by conducting simulation experiments based on the in-furnace heat treatment process parameters and the process parameters of the external auxiliary heating component, including:

[0029] Simulation experiments were conducted based on the process parameters of the internal heat treatment process and the process parameters of the auxiliary heating components to obtain the time variation of the internal heating stage.

[0030] The time variation of the auxiliary heating belt heating stage is obtained based on the time variation of the heating stage of the part inside the furnace, and the time of the auxiliary heating belt heating stage is not greater than the time of the heating stage of the part inside the furnace.

[0031] Based on the time variation of the auxiliary heating belt during the heating stage and the process parameters of the external auxiliary heating component, the process operation curve of the auxiliary heating belt during the heating stage is obtained.

[0032] The advantages of the temperature gradient control method for turning heat treatment described in this invention compared to existing technologies are as follows: This invention provides a method for controlling the temperature gradient in turning heat treatment by conducting simulation experiments using process parameters of the in-furnace heat treatment process and process parameters of the external auxiliary heating components. The structure of the simulated auxiliary heating components in the simulation experiments is the same as that of the external auxiliary heating components. The process operation curve of the external auxiliary heating components is obtained through experiments. Before heat treatment, the placement position of the external auxiliary heating components is set according to the position of the simulated auxiliary heating components in the simulation experiments. When the in-furnace part is undergoing heat treatment, the obtained process operation curve controls the external auxiliary heating components to perform heat treatment synchronously with the in-furnace part. This solves the problem of quantitative execution of temperature gradient control during the turning heat treatment of large, thick-walled containers. Simultaneously, by synchronously heating, holding, and cooling the auxiliary heating components and the in-furnace heat treatment, precise control of the temperature gradient in the turning heat treatment is achieved.

[0033] To address the aforementioned technical problems, the present invention also provides a temperature gradient control device for turning heat treatment, based on a large thick-walled container, the large thick-walled container comprising an inner furnace portion and an outer furnace portion, wherein an external auxiliary heating component is provided at the junction of the inner furnace portion and the outer furnace portion, and the temperature gradient control device for turning heat treatment comprises:

[0034] The acquisition unit is used to acquire some heat treatment process parameters inside the furnace and the process parameters of the auxiliary heating components;

[0035] The processing unit is used to conduct simulation tests based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating component to obtain the process operation curve of the external auxiliary heating component;

[0036] The processing unit is used to set the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test. The structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component.

[0037] The control unit is used to control the heat treatment operation of the furnace part according to the heat treatment process parameters of the furnace part, and to control the auxiliary heating component outside the furnace to perform heat treatment operation synchronously with the furnace part according to the process operation curve.

[0038] The turning-around heat treatment temperature gradient control device and the turning-around heat treatment temperature gradient control method described in this invention have the same advantages over the prior art, and will not be repeated here.

[0039] To address the aforementioned technical problems, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the turning heat treatment temperature gradient control method.

[0040] The computer equipment described in this invention and the temperature gradient control method for turning heat treatment have the same advantages over the prior art, and will not be repeated here.

[0041] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of the aforementioned turning-around heat treatment temperature gradient control method.

[0042] The computer-readable storage medium described in this invention has the same advantages over the prior art as the turning heat treatment temperature gradient control method, and will not be repeated here. Attached Figure Description

[0043] Figure 1 This is a diagram illustrating the application environment of the temperature gradient control method for turning heat treatment in this embodiment of the invention.

[0044] Figure 2 This is a flowchart of the temperature gradient control method for turning heat treatment in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the connection structure between a large thick-walled container and a heat treatment furnace in an embodiment of the present invention. Figure 1 ;

[0046] Figure 4 This is a schematic diagram of the connection structure between a large thick-walled container and a heat treatment furnace in an embodiment of the present invention. Figure 2 ;

[0047] Figure 5 This is a structural diagram of the temperature gradient control device for turning heat treatment in an embodiment of the present invention;

[0048] Figure 6 This is an internal structural diagram of a computer device in an embodiment of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1-Furnace interior; 2-Furnace exterior; 3-Auxiliary heating belt; 4-Auxiliary insulation belt; 5-Furnace door. Detailed Implementation

[0051] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0052] Figure 1 This diagram illustrates the application environment of the temperature gradient control method for turning heat treatment in an embodiment of the present invention. (Refer to...) Figure 1This method for controlling the temperature gradient during a turning-around heat treatment is applied to a temperature gradient control system for the same treatment. This system includes a terminal 110 and a server 120. The terminal 110 and server 120 are connected via a network. The terminal 110 can be a desktop terminal or a mobile terminal; specifically, a mobile terminal can be at least one of a mobile phone, tablet, or laptop. The server 120 can be a standalone server or a server cluster consisting of multiple servers.

[0053] like Figure 2 As shown, in one embodiment, a method for controlling the temperature gradient during a turning heat treatment is provided. This embodiment mainly applies this method to the above-mentioned... Figure 1 Let's take terminal 110 (or server 120) as an example. (Refer to...) Figure 2 The method for controlling the temperature gradient of the turning heat treatment is based on a large, thick-walled container, which includes an inner furnace part 1 and an outer furnace part 2. An auxiliary heating component is provided at the junction of the inner furnace part 1 and the outer furnace part 2. The method specifically includes the following steps:

[0054] Step S1: Obtain the process parameters of some heat treatment processes inside the furnace and the process parameters of auxiliary heating components outside the furnace;

[0055] Step S2: Conduct simulation tests based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating components to obtain the process operation curve of the external auxiliary heating components;

[0056] Step S3: Set the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test. The structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component.

[0057] Step S4: Control the heat treatment operation of the furnace part 1 according to the heat treatment process parameters of the furnace part, and control the auxiliary heating components outside the furnace to perform heat treatment operation synchronously with the furnace part 1 according to the process operation curve.

[0058] Specifically, in this embodiment, the length of the large, thick-walled container is approximately 30-50 meters, its cylindrical diameter is approximately 3-5 meters, and its cylindrical wall thickness is approximately 100-300 centimeters. Existing heat treatment furnaces are approximately 20-30 meters long. Therefore, a segmented reversing heat treatment method is chosen for the large, thick-walled container. This involves first heat-treating one section of the container in the furnace, then welding the other section together with it, and finally reversing the container as a whole for heat treatment. The latter half and the weld seam are located inside the furnace, while the former half is located outside. This segmented reversing heat treatment can be completed using only one integrated heat treatment furnace.

[0059] In some embodiments, the process parameters for some heat treatment processes inside the furnace are obtained through existing heat treatment process standards, while the process parameters for auxiliary heating components outside the furnace are obtained according to existing local heat treatment process standards.

[0060] The temperature gradient control method for reversing heat treatment described in this embodiment uses simulation experiments to test the process parameters of the in-furnace heat treatment process and the process parameters of the external auxiliary heating components. The structure of the simulated auxiliary heating components in the simulation experiment is the same as that of the external auxiliary heating components. The process operation curve of the external auxiliary heating components is obtained through experiments. Before heat treatment, the placement position of the external auxiliary heating components is set according to the position of the simulated auxiliary heating components in the simulation experiment. When the in-furnace part 1 is performing heat treatment, the obtained process operation curve controls the external auxiliary heating components to perform heat treatment synchronously with the in-furnace part 1. Thus, the problem of quantitative execution of temperature gradient control during the reversing heat treatment of large, thick-walled containers is solved. At the same time, by synchronously heating, holding, and cooling of the auxiliary heating components and the in-furnace heat treatment, precise control of the temperature gradient in the reversing heat treatment is achieved.

[0061] In some embodiments, the external auxiliary heating component includes an auxiliary heating belt 3 and an auxiliary insulation belt 4. In step S3, the external auxiliary heating component is set according to the preset position of the simulated auxiliary heating component in the simulation test, including:

[0062] Step S31: Obtain the radius and thickness of the cylinder of the simulated furnace exterior in the simulation test;

[0063] Step S32: Obtain the dimensions of the simulated auxiliary heating belt and the simulated auxiliary insulation belt of the simulated auxiliary heating component based on the cylinder radius and cylinder thickness;

[0064] Step S33: The simulated auxiliary heating belt is tightly laid on the outer wall of the simulated furnace to obtain the first preset position;

[0065] Step S34: Lay the simulated auxiliary insulation tape on the inner and outer walls of the simulated auxiliary heating tape and the simulated furnace exterior to obtain the second preset position;

[0066] Step S35: Set the auxiliary heating belt 3 according to the first preset position and set the auxiliary heat preservation belt 4 according to the second preset position.

[0067] In some preferred embodiments, such as Figure 3 and Figure 4As shown, according to WRC-452 (Standard Specification for Local Heating of Pipelines and Pipe Welds), the widths of the auxiliary heating strip 3 and auxiliary insulation strip 4 for the turning heat treatment are set. The width of the auxiliary heating strip 3 is 2.5Rt, and the width of the insulation strip is 5Rt, where R is the radius of the cylinder and t is the thickness of the cylinder. The auxiliary heating strip 3 is tightly laid on the outer wall of the furnace outer section 2, and the auxiliary insulation strip 4 is laid on the inner and outer walls of the auxiliary heating strip 3 and the furnace outer section 2. The auxiliary heating strip 3 and auxiliary insulation strip 4 are positioned at the junction of the furnace inner section 1 and the furnace outer section 2 (i.e., close to the furnace door 5), which is a location where the temperature may drop significantly. This avoids excessive temperature differences that could lead to deformation or excessive thermal stress in the large rear-walled container.

[0068] It should be noted that the auxiliary heating belt 3 and the auxiliary insulation belt 4 are not limited in terms of the materials used. In this embodiment, for example... Figure 3 and Figure 4 As shown, the auxiliary heating belt 3 uses flexible ceramic electric heating elements, with a single element having a power of 10KW. The flexible ceramic electric heating elements are arranged closely around the circumference of the outer wall of the furnace outer section 2, forming a group with a width of 400mm. They are secured with thin steel straps. The number of groups of flexible ceramic electric heating elements is selected based on the width of the auxiliary heating belt 3. The auxiliary insulation belt 4 is made of aluminum silicate fiber blanket and is secured to the outer wall of the furnace outer section 2 with thin steel straps. The auxiliary insulation belt 4 on the inner wall of the furnace outer section 2 is pressed tightly with tooling.

[0069] It should be noted that the structure of the tooling is not limited in this embodiment, as long as it can fix the auxiliary insulation strip 4.

[0070] In some embodiments, a heat-insulating wall is installed inside the cylinder of the furnace inner section 1, corresponding to the furnace door 5. It should be noted that the material of the heat-insulating wall is not limited, as long as it can provide heat insulation; for example, it can be made of aluminum silicate fiber blanket.

[0071] In some embodiments, the external auxiliary heating component further includes a monitoring thermocouple. Step S3, setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test, further includes:

[0072] Step S36: The simulated monitoring thermocouple of the simulated auxiliary heating component is placed at the middle and edge of the simulated auxiliary heating belt, and is placed between the outer wall of the simulated furnace outer part and the simulated auxiliary heating belt to obtain the third preset position;

[0073] Step S37: Set the monitoring thermocouple according to the third preset position.

[0074] In some preferred embodiments, the monitoring thermocouple is located at the middle and edge of the auxiliary heating belt 3, and is placed between the outer wall of the furnace outer part 2 and the auxiliary heating belt 3. This arrangement enables the monitoring thermocouple to more accurately monitor the temperature of the auxiliary heating component.

[0075] It should be noted that the number and fixing method of the monitoring thermocouples are not limited in this embodiment. In some preferred embodiments, four monitoring thermocouples are used, all of which are welded to the outer wall of the furnace outer part 2. The auxiliary heating belt 3 is laid on the outer wall of the furnace outer part where the monitoring thermocouples are welded. Two thermocouples are set in the middle and two at the edge of the auxiliary heating belt 3, and they are arranged symmetrically at 180° along the circumference of the cylinder. The symmetrical arrangement of the two monitoring thermocouples is representative and relatively convenient to operate.

[0076] In some embodiments, the heat treatment includes a heating stage, and the heat treatment process parameters inside the furnace include the target temperature inside the furnace. In step S4, according to the process operation curve, the auxiliary heating components outside the furnace and the part inside the furnace 1 are controlled to perform heat treatment operations synchronously, including:

[0077] Step S41: When part 1 inside the furnace enters the heating stage, the auxiliary heating belt 3 is heated according to the process operation curve.

[0078] Step S42: When the temperature of the auxiliary heating belt 3 reaches the first preset target temperature, control the auxiliary heating belt 3 to be adjusted to a constant temperature state.

[0079] The first preset target temperature is not lower than half of the target temperature inside the furnace.

[0080] In some preferred embodiments, the temperature of the auxiliary heating belt 3 is the display temperature of all monitoring thermocouples. When the display temperature of all monitoring thermocouples reaches the first preset target temperature, the auxiliary heating belt 3 outside the furnace is controlled to maintain a constant temperature, so that the heating power is kept at a low level.

[0081] In some embodiments, the heat treatment further includes a heat preservation stage. In step S4, controlling the auxiliary heating components outside the furnace and the part 1 inside the furnace to perform heat treatment operations synchronously according to the process operation curve further includes:

[0082] Step S44: When part 1 inside the furnace enters the heat preservation stage, control the temperature at the edge of the auxiliary heating belt 3 to be no lower than the first preset target temperature, and control the temperature at the middle of the auxiliary heating belt 3 to be no lower than the second preset target temperature.

[0083] The second preset target temperature is not lower than three-quarters of the target temperature inside the furnace.

[0084] In some preferred embodiments, when the furnace interior 1 enters the heat preservation stage, the displayed temperatures of the monitoring thermocouples at the edges of the auxiliary heating belt 3 are all not lower than the first preset target temperature, and the displayed temperatures of the monitoring thermocouples in the middle of the auxiliary heating belt 3 are all not lower than the second preset target temperature. Simultaneously, the auxiliary heating belt 3 is kept at a constant temperature. The first preset target temperature is not lower than half of the target temperature inside the furnace, and the second preset target temperature is not lower than three-quarters of the target temperature inside the furnace. The range of the first and second preset target temperatures is set according to the temperature gradient control requirements. If the temperature is lower than the set temperature, not only will the standard requirements not be met, but unfavorable thermal stress will also be generated along the axial direction of the cylinder. However, the temperature should not be too high either. If the temperature is too high, more power is required for auxiliary heating, meaning the width of the auxiliary heating belt 3 or the auxiliary heat preservation belt 4 needs to be increased, leading to resource waste.

[0085] In some embodiments, the heat treatment also includes a cooling stage, and controlling the external auxiliary heating components and the internal part 1 to perform heat treatment operations synchronously according to the process operation curve further includes:

[0086] Step S45: When part 1 inside the furnace enters the cooling stage, the auxiliary heating belt 3 is controlled to cool down until the end according to the process operation curve.

[0087] In some embodiments, the process operation curve includes the process operation curve of the heating stage. In step S2, simulation experiments are conducted based on the process parameters of the in-furnace heat treatment process and the process parameters of the external auxiliary heating components to obtain the process operation curve of the external auxiliary heating components, including:

[0088] Step S21: Conduct a simulation test based on the process parameters of the heat treatment process inside the furnace and the process parameters of the auxiliary heating components to obtain the time change of the heating stage of part 1 inside the furnace.

[0089] Step S22: Based on the time change of the heating stage of part 1 inside the furnace, obtain the time change of the heating stage of the auxiliary heating belt 3, and the time of the heating stage of the auxiliary heating belt 3 is not greater than the time of the heating stage of part 1 inside the furnace.

[0090] Step S23: Based on the time variation of the auxiliary heating belt 3 during the heating stage and the process parameters of the external auxiliary heating components, obtain the process operation curve of the auxiliary heating belt 3 during the heating stage.

[0091] In some preferred embodiments, the heat treatment process includes three parts: a heating stage, a holding stage, and a cooling stage. The corresponding process operation curves include the process operation curves for the heating stage, the holding stage, and the cooling stage. According to actual simulation experiments, the time changes of the three stages of heat treatment in the furnace will be obtained. Based on the time changes of the three stages of heat treatment in the furnace and the process parameters of the auxiliary heating components, the time changes of the three stages of heat treatment of the auxiliary heating components will be obtained. Through the time changes of the three stages of heat treatment of the auxiliary heating components and the process parameters of the auxiliary heating components outside the furnace, the process operation curves of the three stages of heat treatment of the auxiliary heating components will be obtained. In the heating stage, the heating time of the auxiliary heating belt 3 is not greater than the heating time of the furnace part 1. If the heating time of the auxiliary heating belt 3 is less than the heating time of the furnace part 1, a harmful temperature difference may occur, which may lead to unfavorable thermal stress.

[0092] In some preferred embodiments, the heating stage of the furnace interior section 1 lasts for 20 hours. The heating stage of the furnace exterior section 2 must reach the first preset target temperature in advance according to standard requirements. The advance time is determined based on simulation tests, preferably 2 hours or 1-1.5 hours in advance. The cooling stage is not limited to a specific value and can be cooled at the set rate.

[0093] In this embodiment, based on a large, thick-walled container, the large, thick-walled container includes an inner furnace portion 1 and an outer furnace portion 2. An auxiliary heating component is provided at the junction of the inner furnace portion 1 and the outer furnace portion 2. The implementation process of the temperature gradient control for the turning heat treatment in this example is as follows:

[0094] Step A1: Determine the process parameters for some heat treatment processes inside the furnace according to the heat treatment standards;

[0095] Step A2: Determine the heat treatment process parameters for the external auxiliary heating components according to the local heat treatment standards;

[0096] Step A3: Conduct heat treatment tests on the simulated parts based on the heat treatment process parameters of the furnace interior and the auxiliary heating components outside the furnace, and obtain the process operation curve of the heat treatment of the auxiliary heating components outside the furnace.

[0097] The simulated part uses the same type of steel, thickness and similar diameter cylinder as the actual product (large thick-walled container). The heat treatment process used is the same as the heat treatment process in step A1. Based on the heat treatment of the simulated part inside the furnace, the process operation curves of heating, holding and cooling of the auxiliary heating component outside the furnace are obtained, so that the auxiliary heating component of the external part 2 meets the heat treatment process requirements of the auxiliary heating component outside the furnace in step A2.

[0098] Step A4: Set up the external auxiliary heating components for the actual product (large thick-walled container) based on the simulation model;

[0099] Prepare according to the process parameters required for heat treatment in steps A1 and A2, and ensure that the heat treatment equipment, including heat treatment furnace, electric heating temperature control cabinet, automatic temperature recorder, external auxiliary heating components, etc., are in good condition and that the tooling is complete.

[0100] The external auxiliary heating components include an auxiliary heating belt 3, an auxiliary insulation belt 4, and a monitoring thermocouple; the auxiliary heating belt 3 is tightly laid on the outer wall of the cylinder of the external part 2;

[0101] The auxiliary insulation strip 4 is laid on the auxiliary heating strip 3 and on the inner and outer walls of the cylinder of the furnace outer part 2. According to WRC-452, the width of the insulation strip is 5Rt, and the width of the auxiliary heating strip 3 is 2.5Rt, where R is the cylinder radius and t is the cylinder thickness.

[0102] The monitoring thermocouple is located in the middle and at the edge of the auxiliary heating belt 3, and is placed between the outer wall of the outer part 2 of the furnace and the auxiliary heating belt 3.

[0103] Step A5: Set the heat treatment curve of the heat treatment furnace according to the process operation curve of the partial heat treatment in the furnace and start the equipment; set the heat treatment curve of the electric heating temperature control cabinet according to the process operation curve obtained in step A3 and start the equipment.

[0104] Step A6: The auxiliary heating belt 3 of the external part 2 is heated synchronously with the internal part 1 of the furnace;

[0105] The heating rate of the auxiliary heating belt 3 is obtained from the process operation curve obtained in step A3. If all the monitoring thermocouples reach the first preset target temperature, the corresponding electric heater is adjusted to a constant temperature state to keep the heating power at a low level. The first preset target temperature is not lower than half of the target temperature inside the furnace.

[0106] Step A7: After the heat treatment inside the furnace enters the heat preservation stage, the auxiliary heating belt 3 is simultaneously kept warm. The edge temperature of the auxiliary heating belt 3 is controlled to be no less than half of the target temperature inside the furnace, and the middle temperature of the auxiliary heating belt 3 is no less than three-quarters of the target temperature inside the furnace. The heater is then adjusted to a constant temperature state.

[0107] Step A8: After the heat treatment and heat preservation inside the furnace is completed, the furnace will automatically begin to cool down, and the auxiliary heating components outside the furnace will cool down simultaneously.

[0108] Step A9: After the heat treatment of the furnace interior part 1 and the external auxiliary heating components is completed, shut down the equipment and remove the external auxiliary heating belt, monitoring thermocouple, auxiliary insulation belt, etc.

[0109] Step A10: Compile the heat treatment record curves of the external auxiliary heating components and generate a heat treatment report.

[0110] This embodiment provides a method for controlling the temperature gradient during heat treatment in a large, thick-walled container. The container includes an inner furnace section 1 and an outer furnace section 2. An auxiliary heating component is located at the junction of the inner furnace section 1 and the outer furnace section 2. The method simulates the heat treatment process parameters of the inner furnace section and the auxiliary heating component. The structure of the simulated auxiliary heating component is identical to that of the outer furnace auxiliary heating component. The process operation curve of the outer furnace auxiliary heating component is obtained through experiments. Before heat treatment, the placement of the outer furnace auxiliary heating component is set according to the position of the simulated auxiliary heating component in the simulation. When the inner furnace section 1 undergoes heat treatment, the obtained process operation curve controls the outer furnace auxiliary heating component to synchronously perform heat treatment with the inner furnace section 1. This solves the problem of quantitative execution of temperature gradient control during heat treatment in a large, thick-walled container during heat treatment in a large vessel. Furthermore, by synchronizing the heating, holding, and cooling processes of the auxiliary heating component and the inner furnace heat treatment, precise control of the temperature gradient during heat treatment in a large vessel is achieved.

[0111] like Figure 5 As shown, in one embodiment, a temperature gradient control device for turning heat treatment is provided, based on a large thick-walled container, the large thick-walled container including an inner furnace part 1 and an outer furnace part 2, wherein an external auxiliary heating component is provided at the junction of the inner furnace part 1 and the outer furnace part 2, and the temperature gradient control device for turning heat treatment includes:

[0112] The acquisition unit is used to acquire some heat treatment process parameters inside the furnace and the process parameters of the auxiliary heating components;

[0113] The processing unit is used to conduct simulation tests based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating component to obtain the process operation curve of the external auxiliary heating component;

[0114] The processing unit is used to set the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test. The structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component.

[0115] The control unit is used to control the heat treatment operation of the furnace part 1 according to the heat treatment process parameters of the furnace part, and to control the auxiliary heating component outside the furnace to perform heat treatment operation synchronously with the furnace part 1 according to the process operation curve.

[0116] The processing unit in this embodiment is also used to obtain the cylinder radius and cylinder thickness of the simulated furnace outer part in the simulation test; to obtain the dimensions of the simulated auxiliary heating belt and simulated auxiliary insulation belt of the simulated auxiliary heating component according to the cylinder radius and cylinder thickness; to tightly lay the simulated auxiliary heating belt on the outer wall of the simulated furnace outer part to obtain a first preset position; to lay the simulated auxiliary insulation belt on the inner and outer walls of the simulated auxiliary heating belt and the simulated furnace outer part to obtain a second preset position; to set the auxiliary heating belt 3 according to the first preset position and the auxiliary insulation belt 4 according to the second preset position.

[0117] The processing unit in this embodiment is further configured to place the simulated monitoring thermocouple of the simulated auxiliary heating component at the middle and edge of the simulated auxiliary heating belt, and place it between the outer wall of the simulated furnace outer part and the simulated auxiliary heating belt to obtain a third preset position; and set the monitoring thermocouple according to the third preset position.

[0118] The processing unit in this embodiment is also used to conduct simulation experiments based on the process parameters of the heat treatment process inside the furnace and the process parameters of the auxiliary heating component to obtain the time change of the heating stage of the furnace part 1; based on the time change of the heating stage of the furnace part 1, obtain the time change of the heating stage of the auxiliary heating belt 3, and the time of the heating stage of the auxiliary heating belt 3 is not greater than the time of the heating stage of the furnace part 1; based on the time change of the heating stage of the auxiliary heating belt 3 and the process parameters of the auxiliary heating component outside the furnace, obtain the process operation curve of the heating stage of the auxiliary heating belt 3.

[0119] In this embodiment, the control unit is also used to control the auxiliary heating belt 3 to heat up to a first preset target temperature according to the process operation curve when the furnace part 1 enters the heating stage; when the temperature of the auxiliary heating belt 3 reaches the first preset target temperature, control the auxiliary heating belt 3 to be adjusted to a constant temperature state; wherein, the first preset target temperature is not lower than half of the target temperature inside the furnace.

[0120] In this embodiment, the control unit is also used to control the temperature at the edge of the auxiliary heating belt 3 to be no lower than the first preset target temperature and to control the temperature at the middle of the auxiliary heating belt 3 to be no lower than the second preset target temperature when the furnace part 1 enters the heat preservation stage; wherein, the second preset target temperature is no lower than three-quarters of the furnace target temperature.

[0121] In this embodiment, the control unit is also used to control the auxiliary heating belt 3 to cool down until the process operation curve is completed when the furnace section 1 enters the cooling stage.

[0122] The turning-around heat treatment temperature gradient control device and the turning-around heat treatment temperature gradient control method described in this invention have the same advantages over the prior art, and will not be repeated here.

[0123] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method for controlling the temperature gradient of the turning heat treatment.

[0124] Figure 6 An internal structural diagram of a computer device in one embodiment is shown. Specifically, this computer device may be... Figure 1 Terminal 110 (or server 120) in the middle. For example... Figure 6 As shown, the computer device includes a processor, memory, network interface, input device, and display screen connected via a system bus. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement a temperature gradient control method for heat treatment. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to implement the same method. The display screen can be an LCD screen or an e-ink screen. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0125] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method for controlling the temperature gradient of a turning heat treatment.

[0126] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0127] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0128] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

[0129] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A method for controlling the temperature gradient during a turning heat treatment, characterized in that, Based on a large, thick-walled container, the large, thick-walled container includes an inner furnace part (1) and an outer furnace part (2), and an auxiliary heating component is provided at the junction of the inner furnace part (1) and the outer furnace part (2). The method for controlling the temperature gradient of the turning heat treatment includes: Obtain the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating components; Simulation experiments were conducted based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating component to obtain the process operation curve of the external auxiliary heating component. The external auxiliary heating component is set according to the preset position of the simulated auxiliary heating component in the simulation test. The structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component. The external auxiliary heating component includes an auxiliary heating belt (3). Setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test includes: Obtain the radius and thickness of the simulated furnace outer section in the simulation test. The dimensions of the simulated auxiliary heating belt of the simulated auxiliary heating component are obtained based on the cylinder radius and the cylinder thickness. The simulated auxiliary heating belt is tightly laid on the outer wall of the simulated furnace exterior to obtain a first preset position. The auxiliary heating belt (3) is set according to the first preset position; The furnace interior (1) is controlled to perform heat treatment operations according to the furnace interior heat treatment process parameters, and the auxiliary heating components outside the furnace are controlled to perform heat treatment operations synchronously with the furnace interior (1) according to the process operation curve, including: When the furnace part (1) enters the heating stage, the auxiliary heating belt (3) is controlled to heat up according to the process operation curve, and when the temperature of the auxiliary heating belt (3) reaches the first preset target temperature, the auxiliary heating belt (3) is controlled to be adjusted to a constant temperature state, wherein the first preset target temperature is not lower than half of the furnace target temperature; When the furnace interior (1) enters the heat preservation stage, the temperature at the edge of the auxiliary heating belt (3) is controlled to be no lower than the first preset target temperature, and the temperature at the middle of the auxiliary heating belt (3) is controlled to be no lower than the second preset target temperature, wherein the second preset target temperature is no lower than three-quarters of the furnace interior target temperature; When the furnace section (1) enters the cooling stage, the auxiliary heating belt (3) is controlled to cool down until the end according to the process operation curve.

2. The method for controlling the temperature gradient during the turning heat treatment according to claim 1, characterized in that, The external auxiliary heating component also includes an auxiliary insulation strip (4), and the step of setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test further includes: The dimensions of the simulated auxiliary insulation strip of the simulated auxiliary heating component are obtained based on the cylinder radius and the cylinder thickness. The simulated auxiliary heat insulation tape is laid on the inner and outer walls of the simulated auxiliary heating tape and the simulated furnace exterior to obtain a second preset position; The auxiliary heat insulation strip (4) is set according to the second preset position.

3. The method for controlling the temperature gradient during the turning heat treatment according to claim 2, characterized in that, The external auxiliary heating component also includes a monitoring thermocouple, and setting the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test further includes: The simulated monitoring thermocouple of the simulated auxiliary heating component is placed at the middle and edge of the simulated auxiliary heating belt, and positioned between the outer wall of the simulated furnace outer part and the simulated auxiliary heating belt to obtain a third preset position; The monitoring thermocouple is set according to the third preset position.

4. The method for controlling the temperature gradient during the turning heat treatment according to claim 1, characterized in that, The process operation curve includes the process operation curve for the heating stage. The process operation curve for the external auxiliary heating component is obtained by conducting simulation experiments based on the process parameters of the in-furnace heat treatment process and the process parameters of the external auxiliary heating component, including: Based on the process parameters of the heat treatment process inside the furnace and the process parameters of the auxiliary heating component, a simulation experiment was conducted to obtain the time change of the heating stage of the furnace part (1); The time change of the auxiliary heating belt (3) during the heating stage is obtained based on the time change of the heating stage of the furnace part (1), and the time of the heating stage of the auxiliary heating belt (3) is not greater than the time of the heating stage of the furnace part (1). Based on the time variation of the auxiliary heating belt (3) during the heating stage and the process parameters of the external auxiliary heating component, the process operation curve of the auxiliary heating belt (3) during the heating stage is obtained.

5. A device for controlling the temperature gradient of a turning heat treatment as described in any one of claims 1-4, characterized in that, Based on a large, thick-walled container, the large, thick-walled container includes an inner furnace part (1) and an outer furnace part (2), and an auxiliary heating component is provided at the junction of the inner furnace part (1) and the outer furnace part (2). The turning heat treatment temperature gradient control device includes: The acquisition unit is used to acquire some heat treatment process parameters inside the furnace and the process parameters of the auxiliary heating components; The processing unit is used to conduct simulation tests based on the process parameters of the internal heat treatment process and the process parameters of the external auxiliary heating component to obtain the process operation curve of the external auxiliary heating component; The processing unit is used to set the external auxiliary heating component according to the preset position of the simulated auxiliary heating component in the simulation test. The structure of the simulated auxiliary heating component is the same as that of the external auxiliary heating component. The control unit is used to control the heat treatment operation of the furnace part (1) according to the heat treatment process parameters of the furnace part, and to control the auxiliary heating component outside the furnace to perform heat treatment operation synchronously with the furnace part (1) according to the process operation curve.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the turning heat treatment temperature gradient control method as described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the turning heat treatment temperature gradient control method as described in any one of claims 1 to 4.

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