Temperature-field-based anti-freezing and energy-saving operation system and method for self-optimization air cooling island

Abstract

The invention discloses a self-optimizing air cooling island anti-freezing energy-saving operation system and method based on a temperature field. The system comprises an air cooling island exhaust steam pipe, an air cooling island exhaust steam cooling downcomer, an air cooling island condensate pipe, an air cooling island cooling fan and an air cooling island exhaust steam supplementing heating pipe. An outlet of the air cooling island steam exhaust and supplement heating pipe is communicated with an air cooling island steam exhaust pipe, and the air cooling island steam exhaust pipe is communicated with an air cooling island condensate pipe through an air cooling island steam exhaust cooling down pipe. The air cooling island cooling fan is located under the air cooling island steam exhaust pipe and the air cooling island steam exhaust cooling down pipe, and an air cooling island cooling fan anti-freezing curtain is arranged on the upper side of the air cooling island cooling fan. A plurality of air cooling island exhaust steam cooling downcomer temperature fields are arranged on the air cooling island exhaust steam cooling downcomer; and an air cooling island steam exhaust and supplement heating control valve is mounted on the air cooling island steam exhaust and supplement heating pipe. The system and the method can meet the anti-freezing and energy-saving requirements of the air cooling island when the air cooling unit is used for peak regulation in winter.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine operation, and relates to a self-optimizing air-cooled island anti-freezing and energy-saving operation system and method based on a temperature field. Background Art

[0002] With the rapid development of clean energy, the role of coal-fired power in the power industry has become increasingly prominent, especially in ensuring the stability of the energy structure. However, when air-cooled units operate in winter, especially during deep peak shaving, they face the dual challenges of anti-freezing and energy conservation. Existing solutions mainly rely on manual adjustment of the frequency of cooling fan motors, and cannot match the changes in the current ambient temperature in real time, resulting in problems such as untimely adjustment, inaccurate adjustment, and energy inefficiency.

[0003] With the continuous rapid growth of the installed capacity of clean energy every year, and the high proportion of clean energy with strong intermittency and volatility being connected to the power grid, the role of safe and stable coal-fired power as the "pillar" and "ballast" in the power industry has become more and more prominent. Vigorously promoting the "three-in-one linkage" of energy conservation and carbon reduction transformation, flexibility transformation, and heating transformation of coal-fired power plants is an important measure to ensure the stability of China's medium- and long-term energy structure. Continuously improving the deep peak shaving ability and heating flexibility ability of coal-fired generating units has become a severe core issue faced by thermal power generating units.

[0004] When air-cooled units operate in winter, they face the dual challenges of anti-freezing and energy conservation. Especially during the winter heating period, while participating in deep peak shaving during heating operation, the amount of exhaust steam entering the air-cooled island will be greatly reduced, and there is a risk of icing in the exhaust steam cooling downcomer of the air-cooled island. By adjusting the operation mode of the cooling fan motors in the air-cooled island, the opening and closing of the anti-freezing curtains of the cooling fans in the air-cooled island, and the adjustment of the exhaust steam supplementary steam heating control valve in the air-cooled island, an energy-saving balance point can be achieved on the basis of meeting anti-freezing requirements.

[0005] Regarding the problem of anti-freezing and energy-saving operation of the air-cooled island, there are few existing detection devices and control means, mainly relying on manual start-stop of cooling fans and adjustment of motor frequency, and unable to match the changes in the current ambient temperature in real time. There are problems such as untimely adjustment, inaccurate adjustment, and energy inefficiency, and cannot meet the anti-freezing and energy-saving requirements of the air-cooled island during winter peak shaving of air-cooled units. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provide a self-optimizing air-cooled island anti-freezing and energy-saving operation system and method based on a temperature field, which can meet the anti-freezing and energy-saving requirements of the air-cooled island during winter peak shaving of air-cooled units.

[0007] To achieve the above purpose, the present invention discloses a self-optimizing air-cooled island anti-freezing and energy-saving operation system based on a temperature field, including an air-cooled island exhaust pipe, an air-cooled island exhaust steam cooling downcomer, an air-cooled island condensate pipe, an air-cooled island cooling fan, and an air-cooled island exhaust steam supplementary steam heating pipe;

[0008] The outlet of the exhaust steam supplementary steam heating pipe of the air-cooled island is connected to the exhaust steam pipe of the air-cooled island, and the exhaust steam pipe of the air-cooled island is connected to the condensate water pipe of the air-cooled island through the exhaust steam cooling down pipe of the air-cooled island;

[0009] The air-cooled island cooling fan is located directly below the exhaust steam pipe of the air-cooled island and the exhaust steam cooling down pipe of the air-cooled island, and an anti-freezing curtain for the air-cooled island cooling fan is arranged on the upper side of the air-cooled island cooling fan;

[0010] A number of temperature fields of the exhaust steam cooling down pipe of the air-cooled island are arranged on the exhaust steam cooling down pipe of the air-cooled island; an exhaust steam supplementary steam heating control valve is installed on the exhaust steam supplementary steam heating pipe of the air-cooled island.

[0011] A further improvement of the self-optimizing anti-freezing and energy-saving operation system of the air-cooled island based on the temperature field according to the present invention lies in:

[0012] Further, the air-cooled island cooling fan is driven by an air-cooled island cooling fan motor.

[0013] Further, it further includes a DCS system, and the DCS system is connected to the air-cooled island cooling fan, the anti-freezing curtain of the air-cooled island cooling fan, the exhaust steam supplementary steam heating control valve and the temperature field of the exhaust steam cooling down pipe of the air-cooled island.

[0014] The present invention discloses a self-optimizing anti-freezing and energy-saving operation method of an air-cooled island based on the temperature field, including the following steps:

[0015] Measure the temperature T of the exhaust steam cooling down pipe of the air-cooled island and the ambient temperature T0 through the temperature field of the exhaust steam cooling down pipe of the air-cooled island, compare the temperature drop rate δT of the exhaust steam cooling down pipe of the air-cooled island within a unit time t with the preset temperature drop rate δT0, and compare the ambient temperature T0 with the preset ambient temperature T c , and control the air-cooled island cooling fan, the anti-freezing curtain of the air-cooled island cooling fan and the exhaust steam supplementary steam heating control valve according to the comparison results.

[0016] A further improvement of the self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to the present invention lies in:

[0017] Further, when δT is greater than or equal to δT0 and T0 is less than T c , then turn off the air-cooled island cooling fan, turn off the anti-freezing curtain of the air-cooled island cooling fan, and increase the opening degree of the exhaust steam supplementary steam heating control valve.

[0018] Further, when δT is greater than or equal to δT0 and T0 is greater than or equal to T c , then turn off the air-cooled island cooling fan, keep the anti-freezing curtain of the air-cooled island cooling fan open, and reduce the opening degree of the exhaust steam supplementary steam heating control valve.

[0019] Further, when δT is less than δT0 and T0 is less than T c then reduce the current frequency of the air-cooled island cooling fan, keep the anti-freezing curtain of the air-cooled island cooling fan open, and keep the exhaust steam make-up steam heating control valve of the air-cooled island closed.

[0020] Further, when δT is less than δT0 and T0 is greater than or equal to T c then keep the current frequency of the air-cooled island cooling fan, keep the anti-freezing curtain of the air-cooled island cooling fan open, and keep the exhaust steam make-up steam heating control valve of the air-cooled island closed.

[0021] Further, the air-cooled island cooling fan is driven by an air-cooled island cooling fan motor.

[0022] Further, it also includes a DCS system, and the DCS system is connected to the air-cooled island cooling fan, the anti-freezing curtain of the air-cooled island cooling fan, the exhaust steam make-up steam heating control valve of the air-cooled island, and the temperature field of the exhaust steam cooling downcomer of the air-cooled island.

[0023] The present invention has the following beneficial effects:

[0024] When the self-optimizing anti-freezing and energy-saving operation system and method of the air-cooled island based on the temperature field are specifically operated, according to the medium temperature T of the exhaust steam cooling downcomer and the ambient temperature T0 monitored in real time, the change temperature δT of the downcomer within the unit time t, the preset temperature drop rate δT0, and the ambient temperature T0 and T c are used for judgment to obtain an adjustment strategy, so as to automatically control and adjust the cooling fan, the anti-freezing curtain, and the make-up steam heating flow rate, ensure the energy-saving and anti-freezing operation of the air-cooled island anti-freezing system, reduce unnecessary energy consumption waste by optimizing the operation status of the cooling fan, the opening and closing of the windshield curtain, and the make-up steam heating flow rate, improve the energy utilization efficiency, effectively prevent the exhaust steam cooling downcomer of the air-cooled island from freezing, improve the anti-freezing reliability of the air-cooled island system, save energy at the same time, the system structure is simple, easy to install and maintain, and has a wide application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specification drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is a structural schematic diagram of the present invention;

[0027] Figure 2 is a flowchart of the method of the present invention.

[0028] Among them, 1 is the exhaust pipe of the air-cooled island, 2 is the exhaust cooling down pipe of the air-cooled island, 3 is the condensate water pipe of the air-cooled island, 4 is the cooling fan of the air-cooled island, 5 is the cooling fan motor of the air-cooled island, 6 is the anti-freezing curtain of the cooling fan of the air-cooled island, 7 is the temperature field of the exhaust cooling down pipe of the air-cooled island, 8 is the steam make-up heating pipe of the exhaust of the air-cooled island, and 9 is the steam make-up heating control valve of the exhaust of the air-cooled island. Specific implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0031] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0032] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the front and back associated objects.

[0033] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0034] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components in the descriptions and shown in the accompanying drawings of the present invention herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0036] Structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where certain details are enlarged for the purpose of clear expression, and certain details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual requirements.

[0037] Embodiment 1

[0038] Reference Figure 1 , the self-optimizing air-cooled island anti-freezing and energy-saving operation system based on temperature field according to the present invention includes an air-cooled island exhaust pipe 1, an air-cooled island exhaust cooling down pipe 2, an air-cooled island condensate pipe 3, an air-cooled island cooling fan 4, an air-cooled island cooling fan motor 5, an air-cooled island cooling fan anti-freezing curtain 6, an air-cooled island exhaust cooling down pipe temperature field 7, an air-cooled island exhaust make-up steam heating pipe 8, and an air-cooled island exhaust make-up steam heating control valve 9.

[0039] The outlet of the air-cooled island exhaust make-up steam heating pipe 8 is communicated with the air-cooled island exhaust pipe 1, and the air-cooled island exhaust pipe 1 is communicated with the air-cooled island condensate pipe 3 through the air-cooled island exhaust cooling down pipe 2.

[0040] The air-cooled island cooling fan 4 is located directly below the air-cooled island exhaust pipe 1 and the air-cooled island exhaust cooling down pipe 2, and an air-cooled island cooling fan anti-freezing curtain 6 is arranged on the upper side of the air-cooled island cooling fan 4.

[0041] The air-cooled island cooling fan 4 is driven by the air-cooled island cooling fan motor 5.

[0042] A number of temperature fields 7 of the air-cooled island exhaust cooling downcomer are arranged on the air-cooled island exhaust cooling downcomer 2.

[0043] An air-cooled island exhaust steam make-up heating control valve 9 is installed on the air-cooled island exhaust steam make-up heating pipe 8.

[0044] Air-cooled island cooling system: The exhaust steam of the steam turbine unit enters the air-cooled island exhaust pipe 1, the exhaust steam is cooled in the air-cooled island exhaust cooling downcomer 2 for temperature reduction, the cooled condensate water is recovered in the air-cooled island condensate water pipe 3, and the air-cooled island cooling fan 4 is driven by the air-cooled island cooling fan motor 5 for forced convection to meet the ventilation and cooling requirements.

[0045] Air-cooled island monitoring and anti-freezing system: The air-cooled island cooling fan anti-freezing curtain 6 is installed above the air-cooled island cooling fan 4, and the flow-through cooling condition is adjusted by adjusting the switch of the air-cooled island cooling fan anti-freezing curtain 6. The temperature field 7 of the air-cooled island exhaust cooling downcomer is installed on the outer wall of the air-cooled island exhaust cooling downcomer 2 to monitor the temperature change of the air-cooled island exhaust cooling downcomer 2 in real time. The air-cooled island exhaust steam make-up heating pipe 8 uses the auxiliary steam heat source to supplement and heat the air-cooled island exhaust pipe 1, and the make-up steam amount is controlled by the air-cooled island exhaust steam make-up heating control valve 9.

[0046] Control optimization system: The self-optimizing air-cooled island anti-freezing and energy-saving operation strategy algorithm preset in the DCS system controls the operation modes of the air-cooled island cooling fan motor 5, the air-cooled island cooling fan anti-freezing curtain 6 and the air-cooled island exhaust steam make-up heating control valve 9 according to the temperature change measured by the temperature field 7 of the air-cooled island exhaust cooling downcomer.

[0047] Embodiment 2

[0048] Reference Figure 2 , the self-optimizing air-cooled island anti-freezing and energy-saving operation method based on the temperature field according to the present invention comprises the following steps:

[0049] Measure the temperature T of the air-cooled island exhaust cooling downcomer 2 and the ambient temperature T0 through the temperature field 7 of the air-cooled island exhaust cooling downcomer. Compare the temperature drop rate δT of the air-cooled island exhaust cooling downcomer 2 within the unit time t with the preset temperature drop rate δT0. When δT is less than δT0, it indicates that the temperature drops slowly. When δT is greater than or equal to δT0, it indicates that the temperature drops rapidly. At the same time, compare the ambient temperature T0 with the preset ambient temperature T c for comparison. When T0 is greater than or equal to T c , it indicates that the ambient temperature is high. When T0 is less than T c , it indicates that the ambient temperature is low.

[0050] When δT is greater than or equal to δT0 and T0 is less than T c At this time, the anti-freezing pressure is at level 1 and the pressure is extremely high. Then the following operations are carried out: 1) Shut down the cooling fan 4 of the air-cooled island; 2) Shut down the anti-freezing curtain 6 of the cooling fan of the air-cooled island; 3) Increase the opening degree of the exhaust steam make-up steam heating control valve 9 of the air-cooled island.

[0051] When δT is greater than or equal to δT0 and T0 is greater than or equal to T c At this time, the anti-freezing pressure is at level 2 and the pressure is relatively high. Then the following operations are carried out: 1) Shut down the cooling fan 4 of the air-cooled island; 2) Keep the anti-freezing curtain 6 of the cooling fan of the air-cooled island open; 3) Decrease the opening degree of the exhaust steam make-up steam heating control valve 9 of the air-cooled island.

[0052] When δT is less than δT0 and T0 is less than T c At this time, the anti-freezing pressure is at level 3 and the pressure is normal. Then the following operations are carried out: 1) Reduce the current frequency of the cooling fan 4 of the air-cooled island; 2) Keep the anti-freezing curtain 6 of the cooling fan of the air-cooled island open; 3) Keep the exhaust steam make-up steam heating control valve 9 of the air-cooled island closed.

[0053] When δT is less than δT0 and T0 is greater than or equal to T c At this time, the anti-freezing pressure is at level 4 and the pressure is low. Then the following operations are carried out: 1) Keep the current frequency of the cooling fan 4 of the air-cooled island; 2) Keep the anti-freezing curtain 6 of the cooling fan of the air-cooled island open; 3) Keep the exhaust steam make-up steam heating control valve 9 of the air-cooled island closed.

[0054] It should be noted that when the air-cooled island is operating in an anti-freezing and energy-saving manner, the present invention uses the temperature field monitoring to obtain the real-time temperature T of the exhaust steam cooling down pipe 2 of the air-cooled island and the ambient temperature T0, calculates the changing temperature δT of the exhaust steam cooling down pipe 2 of the air-cooled island within the unit time t, and compares it with the predetermined temperature drop rate δT0 and the ambient temperature T c for comparison, adopts the self-optimizing air-cooled island anti-freezing and energy-saving operation strategy algorithm, adjusts and controls the operation modes of the air-cooled island cooling fan motor 5, the anti-freezing curtain 6 of the air-cooled island cooling fan and the exhaust steam make-up steam heating control valve 9 of the air-cooled island, and operates in an energy-saving and economical manner on the basis of ensuring the anti-freezing of the air-cooled island.

[0055] Embodiment III

[0056] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the self-optimizing air-cooled island anti-freezing and energy-saving operation method based on the temperature field are implemented. Among them, the memory may include internal memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk memory, etc.; the processor, network interface, and memory are interconnected through an internal bus, which can be an Industry Standard Architecture bus, a Peripheral Component Interconnect standard bus, an Extended Industry Standard Architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program can include program code, and the program code includes computer operation instructions. The memory can include internal memory and non-volatile memory and provide instructions and data to the processor.

[0057] Embodiment 4

[0058] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the self-optimizing air-cooled island anti-freezing and energy-saving operation method based on the temperature field are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory can include random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disk, etc.

[0059] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 one process or multiple processes and / or blocksFigure 1 means for the functions specified in one or more boxes.

[0061] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the functions specified in one Figure 1 process or a plurality of processes and / or boxes Figure 1 or more boxes.

[0062] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus, such that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one Figure 1 process or a plurality of processes and / or boxes Figure 1 or more boxes.

[0063] Other embodiments of the present invention will be readily apparent to those skilled in the art upon consideration of the specification and the disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include known common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are pointed out by the following claims.

[0064] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

[0065] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A self-optimizing air-cooled island anti-freezing and energy-saving operation system based on a temperature field, characterized in that, It includes an air-cooled island exhaust pipe (1), an air-cooled island exhaust cooling downcomer (2), an air-cooled island condensate pipe (3), an air-cooled island cooling fan (4), and an air-cooled island exhaust supplementary steam heating pipe (8); The outlet of the air-cooled island exhaust supplementary steam heating pipe (8) is communicated with the air-cooled island exhaust pipe (1), and the air-cooled island exhaust pipe (1) is communicated with the air-cooled island condensate pipe (3) through the air-cooled island exhaust cooling downcomer (2); The air-cooled island cooling fan (4) is located directly below the air-cooled island exhaust pipe (1) and the air-cooled island exhaust cooling downcomer (2), and an air-cooled island cooling fan anti-freezing curtain (6) is arranged on the upper side of the air-cooled island cooling fan (4); A number of air-cooled island exhaust cooling downcomer temperature fields (7) are arranged on the air-cooled island exhaust cooling downcomer (2); an air-cooled island exhaust supplementary steam heating control valve (9) is installed on the air-cooled island exhaust supplementary steam heating pipe (8).

2. The self-optimizing air-cooled island anti-freezing and energy-saving operation system based on the temperature field according to claim 1, characterized in that The air-cooled island cooling fan (4) is driven by an air-cooled island cooling fan motor (5).

3. The self-optimizing air-cooled island anti-freezing and energy-saving operation system based on the temperature field according to claim 1, wherein It further includes a DCS system, and the DCS system is connected to the air-cooled island cooling fan (4), the air-cooled island cooling fan anti-freezing curtain (6), the air-cooled island exhaust supplementary steam heating control valve (9), and the air-cooled island exhaust cooling downcomer temperature field (7).

4. A self-optimizing anti-freezing and energy-saving operation method for an air-cooled island based on a temperature field, characterized in that, The temperature-field-based self-optimizing air-cooled island anti-freezing and energy-saving operation system according to claim 1 includes the following steps: Measure the temperature T of the exhaust cooling downcomer (2) of the air-cooled island and the ambient temperature T0 through the temperature field (7) of the exhaust cooling downcomer of the air-cooled island, compare the temperature drop rate δT of the exhaust cooling downcomer (2) of the air-cooled island within the unit time t with the preset temperature drop rate δT0, and compare the ambient temperature T0 with the preset ambient temperature T c , and control the air-cooled island cooling fan (4), the anti-freezing curtain (6) of the air-cooled island cooling fan, and the steam make-up heating control valve (9) of the air-cooled island exhaust according to the comparison results.

5. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, characterized in that, When δT is greater than or equal to δT0 and T0 is less than T c then the cooling fans (4) of the air-cooled island are turned off, the anti-freezing curtains (6) of the air-cooled island are turned off, and the opening degree of the exhaust steam make-up steam heating control valve (9) of the air-cooled island is increased.

6. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, characterized in that, When δT is greater than or equal to δT0 and T0 is greater than or equal to T c then turn off the air-cooled island cooling fan (4), keep the anti-freezing curtain (6) of the air-cooled island cooling fan open, and reduce the opening degree of the exhaust steam make-up steam heating control valve (9) of the air-cooled island.

7. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, characterized in that, When δT is less than δT0 and T0 is less than T c then reduce the current frequency of the air-cooled island cooling fan (4), keep the anti-freezing curtain (6) of the air-cooled island cooling fan open, and keep the exhaust steam make-up steam heating control valve (9) of the air-cooled island closed.

8. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, characterized in that, When δT is less than δT0 and T0 is greater than or equal to T c then maintain the current frequency of the air-cooled island cooling fan (4), keep the anti-freezing curtain (6) of the air-cooled island cooling fan open, and keep the exhaust steam and make-up steam heating control valve (9) of the air-cooled island closed.

9. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, wherein, The air-cooled island cooling fan (4) is driven by an air-cooled island cooling fan motor (5).

10. The self-optimizing anti-freezing and energy-saving operation method of the air-cooled island based on the temperature field according to claim 4, characterized in that, It further includes a DCS system, and the DCS system is connected to the air-cooled island cooling fan (4), the air-cooled island cooling fan anti-freezing curtain (6), the air-cooled island exhaust supplementary steam heating control valve (9), and the air-cooled island exhaust cooling downcomer temperature field (7).

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