Thick-wall element temperature control device and coal-fired power plant system applying same

Abstract

The utility model relates to the technical field of flexible peak regulation of coal-fired power plants, in particular to a thick-wall element temperature control device and a coal-fired power plant system applying the same. The thick-wall element temperature control device comprises a first temperature measuring assembly and a first electromagnetic heating assembly which are arranged in the thick-wall element and close to the working medium side. The second temperature measuring assembly and the second electromagnetic heating assembly are arranged on the outer wall of the thick-wall element; the temperature adjusting controller is electrically connected with the first electromagnetic heating assembly and the second electromagnetic heating assembly, the first temperature measuring assembly and the first electromagnetic heating assembly are electrically connected with the temperature adjusting controller, and the temperature adjusting controller receives temperature data sent by the first temperature measuring assembly and the second electromagnetic heating assembly in real time; and the first electromagnetic heating assembly and / or the second electromagnetic heating assembly are / is controlled to heat. The problems that the thick-wall element is easily damaged, the service life of the thick-wall element is shortened and the safe operation capability of a unit is reduced due to overlarge thermal stress generated by large internal and external temperature difference when the load of the thick-wall element is rapidly increased and decreased are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible peak shaving of coal-fired power plants, and particularly relates to a thick-walled element temperature control device and a coal-fired power plant system applying the same. BACKGROUND

[0002] In the operation process of a coal-fired power plant, thick-walled elements (such as a steam drum, a steam-water separator, a water-cooled lower header, etc.) are key components that bear high-temperature and high-pressure working medium (such as water, steam, etc.). These thick-walled elements need to bear large temperature changes and pressure changes when the load of the power plant changes. These elements usually have large thermal inertia and are prone to generate large thermal stress when the load changes. This thermal stress is one of the main causes of damage to the thick-walled elements, and seriously affects the safe operation capability and service life of the coal-fired power plant.

[0003] In the prior art, an external working medium heat exchange method is usually used to reduce the thermal stress. This method uses external working medium (such as steam or heat conducting oil) to exchange heat with the outer wall of the thick-walled element by arranging working medium introduction pipes, header branch pipes and other devices on the outer wall of the thick-walled element, so as to heat or cool the outer wall of the thick-walled element and thus reduce the thermal stress.

[0004] However, this method can only heat or cool the outer wall of the thick-walled element to reduce the thermal stress, and has no effect on the temperature of the internal working medium. Moreover, due to the large thickness of the thick-walled element, the thermal inertia is large, and the temperature response speed of the internal and external parts is different when the load changes. In particular, when the load of the internal part of the thick-walled element rapidly rises and falls, the temperature response speed of the internal and external parts is greatly different. At this time, only the outer wall of the thick-walled element is heated or cooled by the heat exchange treatment, which cannot timely control the temperature of the internal working medium of the thick-walled element. The internal working medium responds with a lag, and the temperature difference generates excessive thermal stress, which easily causes damage to the thick-walled element, reduces the service life thereof, and even reduces the safe operation capability of the coal-fired unit. CONTENT OF THE UTILITY MODEL

[0005] The present application aims to provide a thick-walled element temperature control device and a coal-fired power plant system applying the same, so as to solve the technical problem that the large temperature difference between the internal and external parts of the thick-walled element generates excessive thermal stress when the load rapidly rises and falls, which easily causes damage to the thick-walled element, reduces the service life thereof, and even reduces the safe operation capability of the coal-fired unit.

[0006] In a first aspect, the present application provides a thick-walled element temperature control device, which comprises:

[0007] a first temperature measurement component and a first electromagnetic heating component arranged at an internal position close to a working medium side of the thick-walled element; and

[0008] a second temperature measurement component and a second electromagnetic heating component arranged on the outer wall of the thick-walled element; and

[0009] A temperature control device electrically connected to the first electromagnetic heating assembly and the second electromagnetic heating assembly, and the first temperature measuring assembly and the first electromagnetic heating assembly are electrically connected to the temperature control device to respectively transmit the first temperature data of the working medium side of the thick-walled element and the second temperature data of the outer wall of the thick-walled element measured in real time to the temperature control device, and the temperature control device controls the first electromagnetic heating assembly and / or the second electromagnetic heating assembly to heat according to the received temperature data.

[0010] Further, the inner wall of the thick-walled element is close to the working medium side of the thick-walled element.

[0011] Further, the first temperature measuring assembly and the second temperature measuring assembly are respectively arranged on the inner wall and the outer wall of the thick-walled element, and a plurality of temperature measuring points are uniformly and spacedly arranged.

[0012] Further, the first electromagnetic heating assembly and the second electromagnetic heating assembly are respectively arranged on the inner wall and the outer wall of the thick-walled element.

[0013] Further, the thick-walled element temperature control device further comprises an external steam heat exchange assembly, which comprises a heat exchange pipe assembly arranged around the outer wall of the thick-walled element, a steam extraction heating pipeline connected to the steam inlet of the heat exchange pipe assembly, and a steam extraction cooling pipeline connected to the steam outlet of the heat exchange pipe assembly.

[0014] The temperature control device is electrically connected to the external steam heat exchange assembly.

[0015] Further, the steam extraction cooling pipeline is connected to a drain pipe, the drain pipe is connected to a heater, and the heater is connected to a feedwater system.

[0016] The steam flowing out of the steam extraction cooling pipeline is circulated back to the heater through the drain pipe, and after being cooled and heat-exchanged into liquid drain, it returns to the feedwater system.

[0017] Further, the first temperature measuring assembly and the second temperature measuring assembly are any one of high-precision temperature sensors, thermocouple sensors, thermal resistance sensors, and infrared thermometers.

[0018] Further, the first electromagnetic heating assembly and the second electromagnetic heating assembly are electromagnetic heaters.

[0019] In a second aspect, the application provides a coal-fired power plant system, which comprises the thick-walled element temperature control device according to any one of the preceding aspects and a thick-walled element applied thereto.

[0020] Further, the coal-fired power plant system further comprises a steam turbine, a generator, a boiler connected to the steam turbine, a heater connected to the boiler through a feedwater pipe, and a drain pipe connected to the heater and a steam extraction cold pipe of the external steam heat exchange assembly of the thick-walled element temperature control device, respectively.

[0021] The steam that has done work in the steam turbine enters the heater through the extraction pipe and exchanges heat with the low-temperature working medium in the drain pipe in a surface type, becoming liquid drain that enters the water delivery pipe.

[0022] Compared with the prior art, the thick-walled element temperature control device provided by the application is provided with a first temperature measurement assembly arranged at a position close to the working medium side in the interior of the thick-walled element to measure the temperature of the working medium side of the thick-walled element in real time and transmit the first temperature data formed in real time to a temperature control device, and a second temperature measurement assembly arranged on the outer wall of the thick-walled element to measure the temperature of the outer wall side of the thick-walled element in real time and transmit the second temperature data formed in real time to the temperature control device, and the temperature control device controls the first electromagnetic heating assembly arranged at a position close to the working medium side in the interior of the thick-walled element and / or the second electromagnetic heating assembly arranged on the outer wall of the thick-walled element electrically connected thereto to heat to perform temperature control work of reducing the temperature difference between the interior and the exterior according to the first temperature data and the second temperature data received thereby.

[0023] When the load decreases, the temperature of the working medium in the interior of the thick-walled element decreases rapidly, the temperature control device receives the first temperature data that is too low in real time, at this time, the temperature control device controls the first electromagnetic heating assembly to heat the working medium side in the interior of the thick-walled element to slow down the temperature decrease speed and reduce the temperature difference; conversely, when the load increases, the temperature of the working medium in the interior of the thick-walled element increases rapidly, the temperature control device receives the first temperature data that is too high in real time, at this time, the outer wall of the thick-walled element does not reflect in time, the temperature of the exterior increases slowly, the temperature control device controls the second electromagnetic heating assembly to heat the outer wall of the thick-walled element to accelerate the temperature increase of the exterior and reduce the temperature difference.

[0024] And the electromagnetic heating mode has extremely fast heating speed, can realize local precise temperature control and millisecond-level response, and can realize rapid heating of the interior, the exterior and the interior and the exterior of the thick-walled element at the same time. Not only the exterior of the thick-walled element is subjected to heat exchange treatment, but also the interior of the thick-walled element can be directly heated rapidly, the temperature of the working medium in the interior can be responded in time, the temperature difference can be controlled in time and effectively, thermal stress can be reduced, the element can be protected, damage caused by thermal effects can be reduced, the service life of the element can be prolonged, and the safe operation ability of the coal-fired unit can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0026] Figure 1 A partial circuit schematic diagram of a coal-fired power plant system provided by an embodiment of the present application;

[0027] Figure 2 A structure and circuit schematic diagram of a thick-walled element temperature control device provided by an embodiment of the present application.

[0028] Reference signs:

[0029] 10 - thick-walled element;

[0030] 21 - first temperature measurement assembly;

[0031] 211 - first temperature measurement point;

[0032] 22 - second temperature measurement assembly;

[0033] 221 - second temperature measurement point;

[0034] 31 - first electromagnetic heating assembly;

[0035] 32 - second electromagnetic heating assembly;

[0036] 40 - temperature adjustment controller;

[0037] 51 - steam extraction heating pipeline;

[0038] 511 - steam inlet;

[0039] 512 - steam inlet valve;

[0040] 52 - steam extraction cooling pipeline;

[0041] 521 - steam outlet;

[0042] 522 - steam outlet valve;

[0043] 61 - boiler;

[0044] 62 - steam turbine;

[0045] 63 - generator;

[0046] 64 - heater;

[0047] 65 - feedwater system;

[0048] 71 - hydrophobic tube;

[0049] 72 - water feed tube;

[0050] 73 - air extraction tube;

[0051] 74 - water delivery tube;

[0052] 75 - condensate tube. DETAILED DESCRIPTION

[0053] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work fall within the scope of protection of the present application.

[0055] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0057] In addition, the terms "horizontal", "vertical", "overhanging", and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0058] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0060] In a first aspect, as shown in Figure 1 and Figure 2 The present application provides a thick-walled element temperature control device, which is applied to a thick-walled element 10, which generally refers to a steam drum, a steam-water separator, a water-cooled wall lower header tank, etc., which is a key component for bearing high-temperature and high-pressure working medium, which refers to water, steam, etc., and the water-cooled wall lower header tank is taken as an example for illustration in the figure.

[0061] The thick-walled element temperature control device comprises a first temperature measuring assembly 21 and a first electromagnetic heating assembly 31 arranged at an internal position close to the working medium side of the thick-walled element 10, specifically the internal position close to the working medium side of the thick-walled element 10 is the inner wall of the thick-walled element 10, the first temperature measuring assembly 21 is used for real-time temperature measurement of the internal working medium side of the thick-walled element 10 (such as the inner wall of the thick-walled element 10), and the first electromagnetic heating assembly 31 is used for heating the internal working medium side of the thick-walled element 10 (such as the inner wall of the thick-walled element 10).

[0062] The thick-walled element temperature control device further comprises a second temperature measuring assembly 22 and a second electromagnetic heating assembly 32 arranged at the outer wall of the thick-walled element 10, the second temperature measuring assembly 22 is used for real-time temperature measurement of the outer wall of the thick-walled element 10, and the second electromagnetic heating assembly 32 is used for heating the outer wall of the thick-walled element 10.

[0063] The thick-walled element temperature control device further comprises a temperature control controller 40 electrically connected with the first electromagnetic heating assembly 31 and the second electromagnetic heating assembly 32, and the first temperature measuring assembly 21 and the first electromagnetic heating assembly 31 are electrically connected with the temperature control controller 40, so as to respectively transmit the first temperature data of the working medium side of the thick-walled element 10 and the second temperature data of the outer wall of the thick-walled element 10 measured in real time to the temperature control controller 40, and the temperature control controller 40 controls the first electromagnetic heating assembly 31 and / or the second electromagnetic heating assembly 32 to heat according to the received temperature data (including the first temperature data and the second temperature data) to reduce the internal and external temperature difference.

[0064] Compared with the prior art, the thick-walled element temperature control device provided by the embodiment of the application is provided with a first temperature measuring assembly 21 arranged at the position close to the working medium side in the interior of the thick-walled element 10, to measure the temperature of the working medium side of the thick-walled element 10 in real time, and transmit the first temperature data formed in real time to the temperature adjusting controller 40, and is provided with a second temperature measuring assembly 22 arranged on the outer wall of the thick-walled element 10, to measure the temperature of the outer wall side of the thick-walled element 10 in real time, and transmit the second temperature data formed in real time to the temperature adjusting controller 40, and the temperature adjusting controller 40 controls the first electromagnetic heating assembly 31 arranged at the position close to the working medium side in the interior of the thick-walled element 10 and / or the second electromagnetic heating assembly 32 arranged on the outer wall of the thick-walled element 10 to heat, according to the first temperature data and the second temperature data received by the temperature adjusting controller 40, to perform the temperature adjusting work of reducing the temperature difference between the interior and the exterior of the thick-walled element 10.

[0065] Specifically, when the load decreases, the temperature of the working medium in the interior of the thick-walled element 10 decreases rapidly, the temperature adjusting controller 40 receives the first temperature data that is too low in real time, at this time, the temperature adjusting controller 40 controls the first electromagnetic heating assembly 31 to heat the interior working medium side of the thick-walled element 10, to slow down the temperature decrease speed and reduce the temperature difference; conversely, when the load increases, the temperature of the working medium in the interior of the thick-walled element 10 increases rapidly, the temperature adjusting controller 40 receives the first temperature data that is too high in real time, at this time, the outer wall of the thick-walled element 10 does not reflect in time, the external temperature increases slowly, the temperature adjusting controller 40 controls the second electromagnetic heating assembly 32 to heat the outer wall of the thick-walled element 10, to accelerate the external temperature increase and reduce the temperature difference.

[0066] And the electromagnetic heating mode has extremely fast heating speed, can realize local precise temperature control and millisecond-level response, and can realize rapid heating of the interior, the exterior and the interior and the exterior of the thick-walled element 10 at the same time. Not only the exterior of the thick-walled element 10 is subjected to heat exchange treatment, but also the interior of the thick-walled element 10 can be directly rapidly heated, the rapid change of the temperature of the working medium in the interior can be responded in time, the temperature difference can be effectively controlled in time, the thermal stress can be reduced, the thick-walled element 10 can be protected, the damage caused by the thermal effect can be reduced, the service life of the thick-walled element 10 can be prolonged, and the safe operation ability of the coal-fired unit can be ensured.

[0067] A preferred embodiment is that the first temperature measuring assembly 21 and the second temperature measuring assembly 22 described above can be respectively laid on the inner wall and the outer wall of the thick-walled element 10, and are respectively provided with multiple temperature measuring points, such as multiple first temperature measuring points 211 and multiple second temperature measuring points 221. In this way, the temperature distribution characteristics of the thick-walled element 10 can be comprehensively reflected, and the subsequent targeted heating of specific temperature loss positions can be guaranteed, to realize targeted local heating and improve the heating efficiency, while saving energy consumption.

[0068] Similarly, the aforementioned first electromagnetic heating assembly 31 and second electromagnetic heating assembly 32 can be respectively laid on the inner wall and outer wall of the thick-walled element 10, on the one hand, to achieve comprehensive and uniform heating, improve the uniformity of heat distribution, and on the other hand, to heat specific temperature loss positions in a targeted manner, to achieve targeted local heating and improve heating efficiency while saving energy. The first electromagnetic heating assembly 31 and the second electromagnetic heating assembly 32 can specifically use electromagnetic heaters 64, which can achieve millisecond-level fast heating response and local precise temperature control.

[0069] Regarding the aforementioned first temperature measurement assembly 21 and second temperature measurement assembly 22, a specific embodiment is that the first temperature measurement assembly 21 and the second temperature measurement assembly 22 can be specifically set as any one of high-precision temperature sensors, thermocouple sensors, thermal resistance sensors, and infrared thermometers.

[0070] Among them, the high-precision temperature sensor can measure the internal and external temperatures of the thick-walled element 10 in real time and accurately. Such a high-precision temperature sensor has high sensitivity and high resolution, and can capture small temperature changes, thereby ensuring accurate temperature measurement. It can be respectively arranged on the working medium side inside the thick-walled element 10 and the outer wall side outside the thick-walled element 10 to comprehensively reflect the temperature distribution characteristics of the thick-walled element 10; the thermocouple sensor is based on the principle of thermoelectric effect and can measure temperature changes in a large temperature range, usually has high stability and reliability, is suitable for high-temperature and high-pressure environments such as coal-fired power plants, and is often used to monitor the temperature of key equipment to ensure its safe operation; the thermal resistance sensor measures temperature by using the characteristic that the resistance of a metal conductor changes with temperature, usually has high precision and stability, and is used in coal-fired power plant equipment that requires precise temperature control to provide accurate temperature feedback for temperature regulation and control; the infrared thermometer calculates the temperature of an object by measuring the infrared energy radiated from its surface, has the advantage of non-contact measurement, and can measure the temperature of the object without disturbing it, especially suitable for measuring the internal and external temperatures of thick-walled elements in difficult-to-contact or high-temperature and high-pressure environments.

[0071] As Figure 1 and Figure 2As shown, a further preferred embodiment is that the temperature control device for thick-walled element provided by the embodiments of the present application can further comprise an external steam heat exchange assembly, which can specifically comprise a heat exchange pipe assembly arranged around the outer wall of the thick-walled element 10, a steam extraction heating pipe 51 connected to the steam inlet 511 of the heat exchange pipe assembly, and a steam extraction cooling pipe 52 connected to the steam outlet 521 of the heat exchange pipe assembly, and specifically, a steam inlet valve 512 can be installed on the steam extraction heating pipe 51 near the steam inlet 511, and a steam outlet valve 522 can be installed on the steam extraction cooling pipe 52 near the steam outlet 521.

[0072] Meanwhile, the aforementioned temperature control device 40 is also electrically connected to the external steam heat exchange assembly, so that the temperature control device 40 can control both the electromagnetic heating and the steam heating, and the electromagnetic heating and the steam heating can be flexibly switched and used at the same time.

[0073] Specifically, when the load rises, the temperature of the working medium in the thick-walled element 10 rises rapidly, while the outer wall of the thick-walled element 10 does not reflect in time, and the external temperature rises slowly. The temperature control device 40 can control the second electromagnetic heating assembly 32 to heat the outer wall of the thick-walled element 10, and at the same time, can control the external steam heat exchange assembly to start steam heating, which can further accelerate the rise of the external temperature, and can assist in sharing the heating work of the second electromagnetic heating assembly 32. Not only can the heating efficiency and the heating speed be improved, but also the power consumption of the electromagnetic heating assembly can be reduced, and the energy consumption can be reduced. In addition, the external steam heat exchange assembly can completely replace the second electromagnetic heating assembly 32 to heat the outer wall of the thick-walled element 10. Although the heating speed is not as fast as the electromagnetic heating speed, the energy consumption can be further reduced, and the energy consumption is lower.

[0074] The above-mentioned embodiments combine the two-way advantages of electromagnetic heating and steam heating, realize precise regulation and control of the temperature of the thick-walled element 10, can improve the heating efficiency, reduce the power consumption, and reduce the energy consumption, and provide a more optimal solution for flexible peak shaving and safe operation of coal-fired power plants.

[0075] The specific process of steam heating can be that the steam extraction of the steam extraction heating pipe 51 flows into the heat exchange pipe assembly arranged around the outer wall of the thick-walled element 10 through the steam inlet valve 512 controlled from the steam inlet 511, and after heat release, the extraction flows out from the steam outlet 521 through the steam outlet valve 522.

[0076] A further embodiment is that the aforementioned steam extraction cooling pipe 52 is connected with a drain pipe 71, the drain pipe 71 is connected with a heater 64, and the heater 64 is connected with a feedwater system 65. The steam flowing out of the steam extraction cooling pipe 52 is circulated back to the heater 64 through the drain pipe 71, and is cooled and exchanged to become liquid drain water, and then returns to the feedwater system 65. Thus, the steam extraction finally flows into the feedwater system 65, without causing energy waste, realizing the recycling of steam, and further reducing energy consumption.

[0077] In the second aspect, the embodiments of the present application further provide a coal-fired power plant system using the thick-walled element temperature control device in any of the aforementioned embodiments. The coal-fired power plant system includes a thick-walled element 10, a steam turbine 62, a generator 63, a boiler 61 connected with the steam turbine 62, a heater 64, a feedwater system 65 connected with the heater 64 through a feedwater pipe 72, a drain pipe 71 connected with the heater 64 and the aforementioned steam extraction cooling pipe 52, and further includes an extraction pipe 73, a water delivery pipe 74, and a condensate pipe 75.

[0078] Specifically, the steam doing work in the steam turbine 62 enters the heater 64 through the extraction pipe 73, and is surface-exchanged with the low-temperature working medium in the drain pipe 71 or the condensate pipe 75, to become liquid drain water, and enters the water delivery pipe 74. The working medium in the water delivery pipe 74 is mixed with the steam working medium in the steam extraction cooling pipe 52, and then enters the drain pipe 71, and is circulated back to the heater 64 through the drain pipe 71, and then returns to the feedwater system 65 through the feedwater pipe 72, thereby realizing the recycling of the whole steam.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements to some or all of the technical features. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A temperature control device for thick-walled components, characterized in that comprising: a first temperature measuring assembly and a first electromagnetic heating assembly arranged at an inner wall of the thick-walled element close to a working medium side; and a second temperature measuring assembly and a second electromagnetic heating assembly arranged at an outer wall of the thick-walled element; and a temperature control device electrically connected with the first electromagnetic heating assembly and the second electromagnetic heating assembly, and the first temperature measuring assembly and the first electromagnetic heating assembly are electrically connected with the temperature control device to respectively transmit the first temperature data of the working medium side of the thick-walled element and the second temperature data of the outer wall of the thick-walled element measured in real time to the temperature control device, and the temperature control device controls the first electromagnetic heating assembly and / or the second electromagnetic heating assembly to heat according to the received temperature data.

2. The thick-walled element temperature control device according to claim 1, wherein the inner wall of the thick-walled element close to the working medium side is an inner wall of the thick-walled element.

3. The thick-walled element temperature control device according to claim 2, wherein the first temperature measuring assembly and the second temperature measuring assembly are respectively arranged on the inner wall and the outer wall of the thick-walled element, and a plurality of temperature measuring points are uniformly and separately arranged.

4. The thick-walled element temperature control device according to claim 3, wherein the first electromagnetic heating assembly and the second electromagnetic heating assembly are respectively arranged on the inner wall and the outer wall of the thick-walled element.

5. The thick-walled element temperature control device according to any one of claims 1 to 4, characterized in that further comprising an external steam heat exchange assembly, which comprises a heat exchange pipe assembly arranged around the outer wall of the thick-walled element, a steam extraction heating pipe connected with a steam inlet of the heat exchange pipe assembly, and a steam extraction cooling pipe connected with a steam outlet of the heat exchange pipe assembly; the temperature control device is electrically connected with the external steam heat exchange assembly.

6. The thick-walled element temperature control device according to claim 5, wherein the steam extraction cooling pipe is connected with a drain pipe, the drain pipe is connected with a heater, and the heater is connected with a feedwater system; steam flowing out of the steam extraction cooling pipe is circulated back to the heater through the drain pipe, and after being cooled and heat-exchanged to become liquid drain, the steam is returned to the feedwater system.

7. The thick-walled element temperature control device according to claim 1, wherein the first temperature measuring assembly and the second temperature measuring assembly are arranged as any one of a high-precision temperature sensor, a thermocouple sensor, a thermal resistance sensor, and an infrared temperature measuring instrument.

8. The thick-walled element temperature control device according to claim 1, wherein the first electromagnetic heating assembly and the second electromagnetic heating assembly are electromagnetic heaters.

9. A coal-fired power plant system, characterized by, The thick-walled element temperature control device according to any one of claims 1 to 8, and a thick-walled element using the same.

10. The coal-fired power plant system of claim 9, wherein, further comprising: a steam turbine, a generator, a boiler connected with the steam turbine, a heater, a feedwater system connected with the heater through a feedwater pipe, and a drain pipe connected with the heater and the steam extraction cooling pipe of the external steam heat exchange assembly of the thick-walled element temperature control device, respectively. The steam that has done work in the turbine enters the heater through the extraction pipe and exchanges heat with the low-temperature working medium in the drain pipe in a surface manner, becoming liquid drain that enters the water delivery pipe. The working medium in the water delivery pipe mixes with the steam working medium in the steam extraction cold pipe and enters the drain pipe, circulates back to the heater through the drain pipe, and returns to the feedwater system through the feedwater pipe.

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