Alkali washing liquid heating device for heating by using annealing tail gas

Abstract

The utility model relates to the technical field of silicon steel production, and particularly discloses an alkali wash liquor heating device for heating by using annealing tail gas, which comprises a tail gas collecting pipeline, a heating device, a heating device and a heating device, and is characterized in that one end of the tail gas collecting pipeline is communicated with a waste gas exhaust pipeline of a continuous decarburization annealing furnace; the combustion assembly is connected with the other end of the tail gas collecting pipeline and used for combusting tail gas; the high-temperature end of the first heat exchanger is connected with the output end of the combustion assembly; a liquid heat transfer medium flowing circularly is arranged in the fluid circulation assembly, the fluid circulation assembly is provided with a first heat exchange section and a second heat exchange section, and the first heat exchange section is configured to be the low-temperature end of the first heat exchanger; the second heat exchange section is configured as a high-temperature end of the second heat exchanger; the alkali wash solution supply assembly is connected with the low-temperature end of the second heat exchanger; the device can effectively recover the heat released by the combustion of the atmosphere in the furnace at the outlet of the smoke exhaust pipeline at the decarburization annealing stage, and is used for heating the alkali wash liquor in the previous alkali wash process, thereby reducing the energy consumption of heating the alkali wash liquor, reducing the direct emission of the tail gas heat and greatly improving the energy utilization efficiency.

Description

Technical Field

[0001] This application relates to the field of silicon steel production technology, and more specifically, to an alkaline washing liquid heating device that utilizes annealing tail gas for heating. Background Technology

[0002] The silicon steel strip processing flow encompasses core steps such as normalizing pickling, cold rolling, alkaline washing, decarburizing annealing, coating, and high-temperature annealing. A typical process route is as follows: After cold rolling, the steel strip first enters an alkaline washing process to remove surface iron powder, oil, and other residues; subsequently, it enters a continuous decarburizing annealing furnace, where decarburization and initial recrystallization annealing are completed in an atmosphere composed of hydrogen, nitrogen, and water vapor to eliminate work hardening and optimize magnetic properties. During annealing, the furnace atmosphere is exhausted through exhaust pipes and ignited at the outlet to ensure the safe and complete combustion of combustible gases. This process involves the release of a large amount of heat, but current processes do not effectively utilize this heat.

[0003] Meanwhile, in the preceding alkaline washing process, the cleaning solution needs to be heated to a specific temperature to ensure the cleaning effect. Traditional methods achieve this temperature rise through externally supplied steam exchange with heat exchange copper busbars.

[0004] The above-mentioned treatment method has significant drawbacks: on the one hand, the steam heat exchange efficiency is limited, resulting in a slow temperature rise of the alkali solution and high energy consumption; on the other hand, the waste heat generated in the annealing process is not recovered, forming a dual energy waste pattern of "front-end heating relying on steam and back-end heat being directly discharged". This process mode not only increases the operating cost of the alkali washing process, but also causes thermal energy redundancy in the annealing stage.

[0005] There is currently no effective technical solution to the above problems. Utility Model Content

[0006] The purpose of this application is to provide an alkaline washing liquid heating device that uses annealing exhaust gas for heating, thereby improving energy utilization efficiency by preheating the alkaline washing liquid in the annealing process.

[0007] This application provides a heating device for alkaline washing solution using annealing exhaust gas, used to heat the alkaline washing solution in an alkaline washing device for silicon steel strip, comprising:

[0008] The exhaust gas collection pipeline is connected at one end to the flue gas duct of the continuous decarburization annealing furnace to collect exhaust gas containing hydrogen.

[0009] A combustion assembly, connected to the other end of the exhaust gas collection pipe, is used to burn the exhaust gas;

[0010] The first heat exchanger has its high-temperature end connected to the output end of the combustion assembly.

[0011] A fluid circulation assembly having a circulating liquid heat transfer medium inside, the fluid circulation assembly having a first heat exchange section and a second heat exchange section, the first heat exchange section being configured as the low-temperature end of the first heat exchanger;

[0012] The second heat exchanger, wherein the second heat exchange section is configured as the high-temperature end of the second heat exchanger;

[0013] The alkaline washing solution supply assembly is connected to the low-temperature end of the second heat exchanger.

[0014] The alkaline washing liquid heating device of this application, which utilizes annealing exhaust gas for heating, is applied to the silicon steel strip production line. It can effectively recover the heat released by the combustion of the furnace atmosphere at the exhaust pipe outlet during the decarburization annealing stage and use it to heat the alkaline washing liquid in the pre-alkaline washing process, thereby reducing the energy consumption of alkaline washing liquid heating and reducing the direct emission of exhaust gas heat, which greatly improves energy utilization efficiency.

[0015] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the fluid circulation component includes a circulation pipe and a drive pump disposed on the circulation pipe, and the circulation pipe includes a first heat exchange section and a second heat exchange section.

[0016] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating includes a flow controller on the input side of the circulation pipeline located in the second heat exchange section, and a temperature sensor in or at the output end of the alkaline washing liquid supply assembly.

[0017] A temperature sensor is installed inside the alkaline washing solution supply assembly or at its output end to monitor the temperature of the alkaline washing solution in real time, so that the control system or operator can accurately grasp the temperature status of the alkaline washing solution and adjust the flow rate of the flow controller according to the real-time temperature of the temperature sensor to change the temperature of the alkaline washing solution.

[0018] The alkaline washing solution heating device that utilizes annealing exhaust gas for heating, wherein the circulation pipeline is equipped with a buffer tank on the input side of the flow controller.

[0019] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating includes a combustion assembly comprising a combustion chamber, an ignition assembly, an oxygen supply assembly, and a heat source pipeline. The ignition assembly is located within the combustion chamber, the oxygen supply assembly is connected to the combustion chamber, the bottom and top of the combustion chamber are respectively connected to the other end of the exhaust gas collection pipeline and one end of the heat source pipeline, and the other end of the heat source pipeline is connected to the high-temperature end of the first heat exchanger.

[0020] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the oxygen supply component is a pointed injection pipe connected to the outside, and its gas supply direction is perpendicular to the direction in which the exhaust gas is supplied into the combustion chamber by the exhaust gas collection pipe.

[0021] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the ignition component includes multiple circumferentially arrayed electric heating wires vertically arranged at the bottom of the combustion chamber.

[0022] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the exhaust gas collection pipeline is equipped with a flame-retardant one-way valve.

[0023] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the alkaline washing liquid supply component is an alkaline solution tank or the output end of the alkaline solution tank.

[0024] The alkaline washing liquid heating device that utilizes annealing exhaust gas for heating, wherein the first heat exchanger is a high-temperature alloy shell-and-tube heat exchanger or a ceramic-based composite heat exchanger.

[0025] As can be seen from the above, the alkaline washing liquid heating device using annealing tail gas for heating in this application is applied to the silicon steel strip production line. It can effectively recover the heat released by the combustion of the furnace atmosphere at the exhaust pipe outlet during the decarburization annealing stage and use it to heat the alkaline washing liquid in the pre-alkaline washing process, thereby reducing the energy consumption of alkaline washing liquid heating and reducing the direct emission of tail gas heat, which greatly improves energy utilization efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an alkaline washing solution heating device that utilizes annealing exhaust gas for heating, provided in some embodiments of this application.

[0027] Figure 2 This is a schematic diagram of the structure of an alkaline washing solution heating device that utilizes annealing exhaust gas for heating, provided for other embodiments of this application.

[0028] Reference numerals: 1. Exhaust duct; 2. Exhaust gas collection duct; 3. Combustion assembly; 4. First heat exchanger; 5. Fluid circulation assembly; 6. Second heat exchanger; 7. Alkali washing solution supply assembly; 21. Flame-retardant check valve; 31. Combustion chamber; 32. Ignition assembly; 33. Oxygen supply assembly; 34. Heat source duct; 51. Circulation duct; 52. Drive pump; 53. Flow controller; 54. Buffer tank; 71. Temperature sensor; 511. First heat exchange section; 512. Second heat exchange section. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0034] Please refer to Figure 1 and Figure 2 Some embodiments of this application provide a heating device for alkaline washing solution using annealing exhaust gas, used to heat the alkaline washing solution in an alkaline washing device for silicon steel strip, comprising:

[0035] The exhaust gas collection pipe 2 is connected at one end to the flue gas pipe 1 of the continuous decarburization annealing furnace to collect exhaust gas containing hydrogen.

[0036] The combustion assembly 3 is connected to the other end of the exhaust gas collection pipe 2 and is used to burn exhaust gas.

[0037] The first heat exchanger 4 has its high-temperature end connected to the output end of the combustion assembly 3;

[0038] The fluid circulation assembly 5 has a circulating liquid heat transfer medium inside it. The fluid circulation assembly 5 has a first heat exchange section 511 and a second heat exchange section 512. The first heat exchange section 511 is configured as the low temperature end of the first heat exchanger 4.

[0039] The second heat exchanger 6, the second heat exchange section 512 is configured as the high temperature end of the second heat exchanger 6;

[0040] The alkaline washing solution supply component 7 is connected to the low-temperature end of the second heat exchanger 6.

[0041] Specifically, the exhaust gas collection pipe 2 is configured to connect to the flue gas pipe 1 of the continuous decarburization annealing furnace to collect exhaust gas containing hydrogen, which is a combustible component in the exhaust gas. The combustion assembly 3 is connected to the exhaust gas collection pipe 2 to burn the collected exhaust gas, converting the chemical energy in the exhaust gas into thermal energy. The high-temperature end of the first heat exchanger 4 is connected to the output end of the combustion assembly 3 to absorb the high-temperature heat generated by combustion. The fluid circulation assembly 5 is filled with a liquid heat transfer medium, such as heat transfer oil, water, or other liquids with high heat transfer coefficients, and circulates within the assembly. The first heat exchange section 511 of the fluid circulation assembly 5 is configured to connect to the low-temperature end of the first heat exchanger 4 to absorb heat from the first heat exchanger 4; the second heat exchange section 512 of the fluid circulation assembly 5 is configured to connect to the high-temperature end of the second heat exchanger 6 to transfer heat to the second heat exchanger 6. The low-temperature end of the second heat exchanger 6 is connected to the alkaline washing liquid supply assembly 7 to transfer heat to the alkaline washing liquid, heating the alkaline washing liquid. The alkaline washing solution supply component 7 provides a source or storage end for the alkaline washing solution, and is used to output the alkaline washing solution to clean the surface of the cold-rolled silicon steel strip.

[0042] The working principle of the alkaline washing liquid heating device utilizing annealing exhaust gas in this embodiment is as follows: The combustible exhaust gas discharged from the annealing furnace is introduced into the combustion assembly 3 through the exhaust gas collection pipe 2. In the combustion assembly 3, the exhaust gas mixes with externally supplied oxygen and is ignited to achieve complete combustion, releasing a large amount of heat energy. The high-temperature flue gas generated by combustion enters the high-temperature end of the first heat exchanger 4 and exchanges heat with the liquid heat transfer medium in the first heat exchange section 511 of the fluid circulation assembly 5, transferring heat to the liquid heat transfer medium. The high-temperature flue gas is then discharged after cooling. The heated liquid heat transfer medium circulates within the fluid circulation assembly 5, reaching the second heat exchange section 512 of the fluid circulation assembly 5, where it exchanges heat with the alkaline washing liquid in the second heat exchanger 6, transferring heat to the alkaline washing liquid. The liquid heat transfer medium is then returned to the first heat exchanger 4 to continue circulating after cooling. The alkaline washing liquid, heated by the second heat exchanger 6, is then transported to the alkaline washing device for alkaline washing treatment of the silicon steel strip.

[0043] The alkaline washing liquid heating device using annealing exhaust gas in this embodiment of the application is used on a silicon steel strip production line. It can effectively recover the heat released by the combustion of the furnace atmosphere at the exhaust pipe outlet during the decarburization annealing stage and use it to heat the alkaline washing liquid in the pre-alkaline washing process, thereby reducing the energy consumption of alkaline washing liquid heating and reducing the direct emission of exhaust gas heat, which greatly improves energy utilization efficiency.

[0044] In some preferred embodiments, the fluid circulation assembly 5 includes a circulation pipe 51 and a drive pump 52 disposed on the circulation pipe 51. The circulation pipe 51 includes a first heat exchange section 511 and a second heat exchange section 512.

[0045] Specifically, the circulation pipe 51 serves as a channel for the heat transfer medium, ensuring its effective flow between the first heat exchange section 511 and the second heat exchange section 512. The drive pump 52 provides power for the circulation of the heat transfer medium, overcoming flow resistance and achieving forced circulation. The drive pump 52 can be of various types, such as a centrifugal pump or a positive displacement pump, to adapt to different flow and pressure requirements under various operating conditions. The circulation pipe 51 can be made of high-temperature and corrosion-resistant metal materials, such as stainless steel or alloy steel, to ensure long-term stable operation under the influence of high-temperature exhaust gas and the heat transfer medium. The routing and arrangement of the circulation pipe 51 can be flexibly designed according to the structure and space of the device to reduce pipe length and resistance, and improve heat transfer efficiency. As an improvement, an insulation layer can be installed on the outer surface of the circulation pipe 51 to reduce heat loss and improve energy utilization.

[0046] In some preferred embodiments, the circulation pipe 51 is equipped with a flow controller 53 on the input side of the second heat exchange section 512, and the alkaline washing liquid supply assembly 7 is equipped with a temperature sensor 71 inside or at its output end.

[0047] Specifically, a flow controller 53 is configured on the input side of the circulation pipe 51 located in the second heat exchange section 512, for precisely regulating the flow rate of the liquid heat transfer medium entering the second heat exchange section 512. The flow controller 53 can be an automatic regulating valve or a mass flow controller 53, which can automatically adjust the valve opening according to preset system parameters or real-time feedback signals, thereby achieving precise flow control. A temperature sensor 71 is installed inside or at the output end of the alkaline washing solution supply assembly 7 for real-time monitoring of the alkaline washing solution temperature. The temperature sensor 71 can be a thermocouple or a resistance temperature sensor, which converts the measured temperature data into an electrical signal so that the control system or operator can accurately grasp the temperature status of the alkaline washing solution.

[0048] More specifically, in some embodiments, the operator can adjust the flow rate of the flow controller 53 according to the real-time temperature of the temperature sensor 71 to change the temperature of the alkaline washing solution, thereby achieving online adjustment of the alkaline washing solution temperature. In other embodiments, the device of this application can also introduce a controller to further adjust the opening of the flow controller 53 according to the deviation between the set target temperature and the actual temperature of the alkaline washing solution, thereby changing the input flow rate at the high-temperature end of the second heat exchanger 6, thus forming a closed-loop control to ensure that the alkaline washing solution is heated to a suitable temperature, thereby achieving automatic dynamic adjustment of the alkaline washing solution temperature and improving the heating efficiency and heating effect of the alkaline washing solution. The control process can be implemented by PID control or other methods, which will not be elaborated here.

[0049] In some preferred embodiments, the circulation pipe 51 is provided with a buffer tank 54 on the input side of the flow controller 53.

[0050] Specifically, the buffer tank 54 is connected to the upstream pipe of the flow controller 53. The buffer tank 54 can be a vertical cylindrical tank structure with an outer thermal insulation layer. The outlet of the buffer tank 54 is connected to the pipe before the inlet of the flow controller 53 via a pipeline.

[0051] More specifically, when fluid flows within the pipe, the driving pump 52 or other factors may cause fluctuations in flow rate or pressure. A buffer tank 54, positioned before the flow controller 53, absorbs these fluctuations. When the flow rate increases, the buffer tank 54 can temporarily hold a portion of the fluid; when the flow rate decreases, the buffer tank 54 releases the fluid. This stabilizes the fluid flow rate entering the flow controller 53, improves the control accuracy of the flow controller 53, and enhances the operational stability of the heating device.

[0052] It should be noted that the drive pump 52 can be installed on the pipe section between the buffer tank 54 and the first heat exchange section 511 in the circulation pipe 51 according to the medium flow direction, or it can be installed on the pipe section between the second heat exchange section 512 and the first heat exchange section 511 in the circulation pipe 51 according to the medium flow direction. In this embodiment, the former is preferred.

[0053] More specifically, the buffering function described above is particularly suitable for the automatic dynamic adjustment of the alkaline washing solution temperature. It can effectively isolate the delivery capacity of the drive pump 52 and the flow controller 53, that is, it avoids the flow fluctuation caused by the automatic dynamic adjustment of the alkaline washing solution temperature from affecting the driving capacity of the drive pump 52, and also avoids the driving capacity of the drive pump 52 from affecting the automatic dynamic adjustment capability of the alkaline washing solution temperature.

[0054] In some preferred embodiments, the combustion assembly 3 includes a combustion chamber 31, an ignition assembly 32, an oxygen supply assembly 33, and a heat source pipe 34. The ignition assembly 32 is disposed in the combustion chamber 31, the oxygen supply assembly 33 is connected to the combustion chamber 31, the bottom and top of the combustion chamber 31 are respectively connected to the other end of the exhaust gas collection pipe 2 and one end of the heat source pipe 34, and the other end of the heat source pipe 34 is connected to the high-temperature end of the first heat exchanger 4.

[0055] Specifically, the combustion chamber 31 is a high-temperature resistant, sealed container that provides space for exhaust gas combustion. The ignition assembly 32 can be in the form of an electric heating wire or a spark plug, etc., to reliably ignite the exhaust gas. The oxygen supply assembly 33 can be a nozzle structure that injects oxygen or air into the combustion chamber 31 to assist in the complete combustion of the exhaust gas. The oxygen injection direction can be adjusted to achieve good mixing of oxygen and exhaust gas. The heat source pipe 34 can be a metal pipe, such as a steel pipe, to effectively transfer the high-temperature heat generated in the combustion chamber 31 to the first heat exchanger 4.

[0056] More specifically, the combustion process of the hydrogen-containing exhaust gas takes place within the combustion chamber 31. The high-temperature flue gas generated during combustion enters the heat source pipe 34 from the top of the combustion chamber 31. The heat source pipe 34 guides the high-temperature flue gas to the high-temperature end of the first heat exchanger 4 for heat exchange, achieving stable combustion and efficient heat output of the exhaust gas, thus providing a stable heat source for subsequent alkaline washing liquid heating. This structure improves combustion efficiency and stability, thereby enhancing heat utilization.

[0057] In some preferred embodiments, the oxygen supply assembly 33 is a pointed injection pipe connected to the outside, and its air supply direction is perpendicular to the direction in which the exhaust gas collection pipe 2 supplies exhaust gas into the combustion chamber 31.

[0058] Specifically, the pointed injection pipe is used to concentrate outside air and form a high-speed air jet to be input into the combustion chamber 31. The injection pipe is fixed to the side wall of the combustion chamber 31 by welding. The nozzle extends into the interior of the combustion chamber 31, so that the oxygen injection direction and the exhaust gas entry direction are perpendicular to each other.

[0059] More specifically, the pointed nozzle ejects an oxygen jet that meets the exhaust gas perpendicularly, achieving rapid mixing. The perpendicular injection generates turbulence, enhancing the mixing effect between the oxygen and the exhaust gas. The mixed gas is ignited by the ignition assembly 32, allowing the hydrogen to burn completely and release heat. Complete combustion improves thermal energy utilization efficiency and reduces the safety hazards caused by unburned hydrogen emissions.

[0060] In some preferred embodiments, the ignition assembly 32 includes a plurality of circumferentially arrayed electric heating wires vertically disposed at the bottom of the combustion chamber 31.

[0061] Specifically, multiple circular arrays of electric heating wires are configured to form a uniformly distributed ignition area at the bottom of the combustion chamber 31, thereby ensuring that the exhaust gas can be fully ignited and improving the reliability of ignition. The vertical arrangement allows the electric heating wires to effectively contact the rising exhaust gas, improving ignition efficiency.

[0062] More specifically, the circumferential array of the ignition assembly 32 is centered on the center of the exhaust gas intake duct.

[0063] In some preferred embodiments, the exhaust gas collection line 2 is equipped with a flame-retardant one-way valve 21.

[0064] Specifically, the one-way flow characteristic of the flame-retardant one-way valve 21 allows exhaust gas to flow towards the combustion assembly 3, while blocking flame propagation in the opposite direction, thus preventing the flame from spreading to the exhaust gas collection pipe 2 and preventing potential explosions or fires. The valve body material of the flame-retardant one-way valve 21 can be selected from high-temperature and corrosion-resistant metals or alloys to adapt to the high-temperature and corrosive environment of the exhaust gas. The flame-retardant one-way valve 21 can be installed close to the connection between the exhaust gas collection pipe 2 and the combustion assembly 3 to maximize its flame-retardant effect.

[0065] More specifically, the flame-retardant one-way valve 21 can be a spring-loaded check valve. The valve body is made of stainless steel, capable of withstanding the long-term effects of high-temperature exhaust gases. The check valve is installed on the exhaust gas collection line 2, adjacent to the exhaust gas inlet of the combustion assembly 3. The spring-loaded check valve opens under the positive pressure of the exhaust gas, allowing the exhaust gas to flow into the combustion assembly 3. When abnormal backfire occurs in the combustion assembly 3, the reverse pressure disappears, and the spring drives the valve to close rapidly, physically blocking the path of reverse flame propagation and ensuring the safety of the exhaust gas collection line 2.

[0066] In some preferred embodiments, the alkaline washing solution supply component 7 is an alkaline solution tank or the output end of the alkaline solution tank.

[0067] Specifically, when the alkaline washing solution supply component 7 is configured as an alkaline solution tank, the alkaline washing solution supply component 7 is used to store the alkaline washing solution to be used. That is, the device of this application actually heats and adjusts the temperature of the stored alkaline washing solution to ensure that the subsequent alkaline washing process can proceed smoothly. When the alkaline washing solution supply component 7 is configured as the output end of the alkaline solution tank, the alkaline washing solution supply component 7 is the direct supply end of the alkaline washing solution. That is, the device of this application actually heats the alkaline washing solution to be used on the silicon steel strip so that the alkaline washing solution sprayed or brushed on the surface of the silicon steel strip meets the temperature requirements of the alkaline washing process.

[0068] In some preferred embodiments, the alkaline washing solution supply component 7 is preferably an alkaline solution tank, and the second heat exchanger 6 is preferably a serpentine tube evenly distributed at the bottom of the alkaline solution tank. The upper wall of the serpentine tube is the low-temperature section of the second heat exchanger 6, so as to heat the alkaline solution tank by means of contact heat transfer through the serpentine tube. In other real-time embodiments, the second heat exchanger 6 can also be a plate heat exchanger.

[0069] In some preferred embodiments, the first heat exchanger 4 is a high-temperature alloy shell-and-tube heat exchanger or a ceramic-based composite heat exchanger.

[0070] Specifically, high-temperature alloy shell-and-tube heat exchangers are made of high-temperature alloy materials, such as nickel-based or iron-nickel-based high-temperature alloys. These high-temperature alloy materials possess excellent high-temperature strength, oxidation resistance, and corrosion resistance, ensuring stable operation of the heat exchanger in high-temperature exhaust gas combustion environments.

[0071] More specifically, ceramic-based composite heat exchangers are manufactured using ceramic matrix composites, such as silicon carbide ceramic matrix composites or alumina ceramic matrix composites. Ceramic matrix composites also possess excellent high-temperature resistance and chemical stability, particularly excelling in corrosion resistance. Ceramic materials allow for higher operating temperatures, further improving heat recovery efficiency.

[0072] More specifically, both shell-and-tube heat exchangers and ceramic-based composite heat exchangers can be applied to the alkaline washing liquid heating device of this application that utilizes annealing tail gas for heating, so as to adapt to the high-temperature environment generated by the combustion of annealing tail gas, ensuring the reliability and long service life of heat exchange under the high-temperature annealing tail gas combustion environment, solving the problem of low efficiency or short service life of ordinary heat exchangers under high-temperature environment, and improving the overall performance and operational stability of the device.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A heating device for alkaline washing solution using annealing exhaust gas, used for heating the alkaline washing solution in an alkaline washing device for silicon steel strip, characterized in that, It includes: The exhaust gas collection pipeline is connected at one end to the flue gas duct of the continuous decarburization annealing furnace to collect exhaust gas containing hydrogen. A combustion assembly, connected to the other end of the exhaust gas collection pipe, is used to burn the exhaust gas; The first heat exchanger has its high-temperature end connected to the output end of the combustion assembly. A fluid circulation assembly having a circulating liquid heat transfer medium inside, the fluid circulation assembly having a first heat exchange section and a second heat exchange section, the first heat exchange section being configured as the low-temperature end of the first heat exchanger; The second heat exchanger, wherein the second heat exchange section is configured as the high-temperature end of the second heat exchanger; The alkaline washing solution supply assembly is connected to the low-temperature end of the second heat exchanger.

2. The alkaline washing solution heating device using annealing tail gas for heating according to claim 1, characterized in that, The fluid circulation assembly includes a circulation pipe and a drive pump disposed on the circulation pipe, the circulation pipe including a first heat exchange section and a second heat exchange section.

3. The alkaline washing solution heating device using annealing tail gas for heating according to claim 2, characterized in that, The circulation pipeline is equipped with a flow controller on the input side of the second heat exchange section, and the alkaline washing liquid supply assembly is equipped with a temperature sensor at its output end.

4. The alkaline washing solution heating device using annealing tail gas for heating according to claim 3, characterized in that, The circulation pipe is located on the input side of the flow controller and is equipped with a buffer tank.

5. The alkaline washing solution heating device using annealing tail gas for heating according to claim 1, characterized in that, The combustion assembly includes a combustion chamber, an ignition assembly, an oxygen supply assembly, and a heat source pipeline. The ignition assembly is located in the combustion chamber, the oxygen supply assembly is connected to the combustion chamber, the bottom and top of the combustion chamber are respectively connected to the other end of the exhaust gas collection pipeline and one end of the heat source pipeline, and the other end of the heat source pipeline is connected to the high-temperature end of the first heat exchanger.

6. The alkaline washing solution heating device using annealing tail gas for heating according to claim 5, characterized in that, The oxygen supply component is a pointed injection pipe connected to the outside, and its air supply direction is perpendicular to the direction in which the exhaust gas is supplied into the combustion chamber by the exhaust gas collection pipe.

7. The alkaline washing solution heating device using annealing tail gas for heating according to claim 5, characterized in that, The ignition assembly includes multiple circumferentially arrayed electric heating wires vertically arranged at the bottom of the combustion chamber.

8. The alkaline washing solution heating device using annealing tail gas for heating according to claim 1, characterized in that, The exhaust gas collection pipeline is equipped with a flame-retardant one-way valve.

9. The alkaline washing solution heating device using annealing tail gas for heating according to claim 1, characterized in that, The alkaline washing solution supply component is an alkaline solution tank or the output end of the alkaline solution tank.

10. The alkaline washing solution heating device using annealing tail gas for heating according to claim 1, characterized in that, The first heat exchanger is a high-temperature alloy shell-and-tube heat exchanger or a ceramic-based composite heat exchanger.

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