Anti-corrosion structure and method for improving energy efficiency of dehumidifier in closed space of steel structure

Abstract

The invention relates to a dehumidification and corrosion prevention technology of a steel structure, in particular to a corrosion prevention structure and method for improving the energy efficiency of a dehumidifier in a closed space of the steel structure, and the corrosion prevention structure comprises a watertight door group and the dehumidifier which are arranged at the two ends of a steel box girder respectively; each watertight door group at least comprises two watertight doors, beam end partition bins are formed among the watertight doors in the watertight door groups, and dehumidifier arrangement bins are formed among the watertight door groups; each watertight door is provided with an independent watertight door motor; the beam end partition bin is provided with a first humidity sensor; a dehumidifier, a second humidity sensor and a control system are arranged in the dehumidifier arrangement bin; the control system is connected with the watertight door motor, the dehumidifier, the first humidity sensor and the second humidity sensor. Compared with the prior art, the problems that an existing dehumidifier in the steel box girder is low in operation energy efficiency and high in maintenance cost are solved, the working efficiency of the dehumidifier is improved, the energy consumption and the power consumption of the dehumidifier are reduced, and the maintenance cost of a bridge is reduced.

Description

Technical Field

[0001] The invention relates to a dehumidification and anti-corrosion technology for a steel structure, and in particular to an anti-corrosion structure and method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure. Background Art

[0002] Most of the extra-large steel box girder bridges are across rivers or seas. Due to the evaporation of a large amount of water on the surface of rivers and seas, the bridges are always in an extremely high humidity environment, which brings great difficulties to the maintenance, upkeep and safety work of the bridges. Especially in steel structure bridges, corrosion and rust often occur, which seriously affects the service life of the bridges and greatly increases the maintenance and upkeep costs and workload of the bridges. Affected by the relative humidity of the air, when the relative humidity in the air exceeds 60%, the corrosion rate of steel rises exponentially, and when the relative humidity of the air is less than 50%, the corrosion rate is extremely low.

[0003] For the anti-corrosion method of closed spaces of steel structures, active control methods can be adopted. In order to ensure that the humidity inside the steel box girder is always controlled within the standard humidity range below 45%, a dehumidifier is often installed in the steel box girder so that the humid air in the steel box girder can be sent out through the dehumidifier, thereby reducing the humidity inside the steel box girder and reducing the corrosion rate of the steel structure.

[0004] Through the investigation of the existing steel structure bridges on rivers, the following two phenomena were found: 1. Although dehumidifiers are generally arranged on large bridges, the box beams are severely corroded at the ends of the beams close to the external humid air; 2. According to the setting principle of the dehumidifier, the dehumidifier generally operates only when the air humidity in the box beam exceeds 45% to discharge the humid air. It is a dynamic operation. However, the dehumidifiers in large bridges are always in high-load operation and almost never stop. This results in low energy efficiency of dehumidification and high power consumption, which results in high investment cost for the later maintenance of the bridge.

[0005] The existing technology is to use a watertight door at the end of the steel box girder to close the main beam and isolate it from the external natural environment, hereinafter referred to as the single-layer watertight door arrangement method. The single-layer watertight door arrangement method is to use only one layer of watertight door to isolate the inside of the main beam from the external natural environment as a dehumidification unit. However, this structural design method has the problem that the isolation and closure of the main beam box interior from the external environment is not complete, and the humidity of the external environment is very easy to exchange with the humidity of the environment inside the main beam. Summary of the invention

[0006] The purpose of the present invention is to solve at least one of the above problems and provide an anti-corrosion structure and method for improving the energy efficiency of dehumidifiers in closed spaces of steel structures, so as to solve the problems of low operating efficiency and high maintenance costs caused by long-term high-load operation of dehumidifiers in steel box girders in the prior art. This solution improves the working efficiency of dehumidifiers, reduces the energy consumption and power consumption of dehumidifiers, and reduces the cost of bridge maintenance. At the same time, by strengthening the anti-corrosion coating grade of the isolation chamber and increasing the thickness of the anti-corrosion coating, the corrosion rate of the isolation chamber can be reduced.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] The first aspect of the present invention discloses an anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure, which is used for anti-corrosion of a steel box girder. The anti-corrosion structure comprises a watertight door group and a dehumidifier respectively arranged at both ends of the steel box girder;

[0009] The watertight door group includes at least two watertight doors, the steel box beams between the watertight doors in the watertight door group form a beam end compartment, and the steel box beams between the watertight door groups form a dehumidifier arrangement compartment; each watertight door in the watertight door group is equipped with an independent watertight door motor;

[0010] The beam end compartment is provided with a first humidity sensor;

[0011] The dehumidifier arrangement compartment is provided with a dehumidifier, a second humidity sensor and a control system;

[0012] The control system is electrically connected to the watertight door motor, the dehumidifier, the first humidity sensor and the second humidity sensor.

[0013] Preferably, the watertight door group is a double-channel watertight door, consisting of an outer watertight door and an inner watertight door.

[0014] Preferably, the anti-corrosion coating grade in the beam end compartment is higher than the anti-corrosion coating grade in the dehumidifier arrangement compartment.

[0015] Preferably, the anti-corrosion coating grade in the beam end compartment complies with the anti-corrosion coating grade for the corresponding environmental category of the bridge in JT / T 722-2023 (Technical Conditions for Anti-corrosion Coating of Highway Bridge Steel Structures).

[0016] Preferably, the dehumidifiers are provided in a plurality of units, arranged along the length or width direction of the steel box girder, or arranged in an array form inside the steel box girder. The specific number and specific arrangement positions of the dehumidifiers should be determined based on the dehumidification range of a single dehumidifier and the space that can be arranged in the bridge structure.

[0017] Preferably, the width of the beam end compartment is 1-1.5 times the height of the main beam of the steel box beam. Usually, the width of the beam end compartment is 3-5m.

[0018] The second aspect of the present invention discloses an anti-corrosion method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure, using any of the anti-corrosion structures described above;

[0019] The humidity in the beam end compartment and the dehumidifier arrangement compartment is measured respectively by the first humidity sensor and the second humidity sensor, and the measured humidity data is sent to the control system; the control system compares the relationship between the measured value and the set value, and instructs the operation of the watertight door motor and / or the dehumidifier according to the comparison result.

[0020] Preferably, the first setting value of the dehumidifier arrangement compartment is 20-60%, and the second setting value of the beam end compartment is 50-90%;

[0021] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment is less than the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment is less than the second set value, the dehumidifier does not operate, and the non-outermost watertight door in the watertight door group is closed;

[0022] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment is less than the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment is greater than or equal to the second set value, the dehumidifier does not operate, and the non-outermost watertight door in the watertight door group opens;

[0023] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment is greater than or equal to the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment is greater than or equal to the second set value, the dehumidifier operates and the non-outermost watertight door in the watertight door group opens;

[0024] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment is greater than or equal to the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment is less than the second set value, the dehumidifier operates and the non-outermost watertight door in the watertight door group is closed;

[0025] The outermost watertight door and the non-outermost watertight doors in the watertight door group are not opened at the same time.

[0026] The first set value and the second set value mentioned above are determined according to the specific environment in which the steel box girder is located.

[0027] Preferably, the anti-corrosion structure further comprises temperature sensors respectively arranged inside the beam end compartment and the dehumidifier arrangement compartment, and the temperature sensors are electrically connected to the control system for correcting the measured value of the humidity.

[0028] Preferably, the control system comprises a prediction module, a communication module, a comparison module and an instruction module, the input end of the communication module is connected to an external data transceiver device, the output end of the communication module, the first humidity sensor, the second humidity sensor and the temperature sensor are connected to the input end of the prediction module, the output end of the prediction module is connected to the input end of the comparison module, the output end of the comparison module is connected to the input end of the instruction module, and the output end of the instruction module is connected to the watertight door motor and the dehumidifier;

[0029] The prediction module is loaded with a neural network algorithm, which takes the humidity data measured by the first humidity sensor and the second humidity sensor, the temperature data measured by the temperature sensor, the weather data outside the steel box girder, the arrangement mode and the operation time of the dehumidifier, the opening and closing state of the watertight door group, the total length of the steel box girder, the width of the beam end compartment and the time data as input, and takes the humidity change prediction curve in the beam end compartment and the dehumidifier arrangement compartment as output, and the instruction module implements the instruction based on the comparison result of the humidity change prediction curve and the set value in the comparison module;

[0030] The humidity change prediction curve is a curve of humidity and time;

[0031] The neural network algorithm uses past data as a training set.

[0032] The working principle of the present invention is:

[0033] The present invention proposes a method for anti-corrosion of a steel structure enclosed space based on improving the energy efficiency of dehumidifier use. By setting a double set of watertight doors at the end of the main beam (steel box beam) and adding an edge isolation chamber (beam end compartment), the external humid air is not directly exchanged with the dry air in the chamber inside the main beam (dehumidifier arrangement chamber), and the external air can only be directly exchanged with the air in the edge isolation chamber. After passing through the edge isolation chamber, the air is exchanged with the chamber inside the main beam, which improves the original situation that only a single watertight door is used, and it is difficult to completely isolate the dry air inside the main beam from the humid air in the external environment. In this way, the working efficiency of the dehumidifier is improved, the energy consumption and power consumption of the dehumidifier are reduced, and the cost of bridge maintenance is reduced. At the same time, the corrosion rate of the edge isolation chamber is reduced by strengthening the anti-corrosion coating grade of the edge isolation chamber and strengthening the thickness of the anti-corrosion coating.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention proposes a method for anti-corrosion of a steel structure enclosed space based on improving the energy efficiency of dehumidifier use. The anti-corrosion method is mainly implemented through the following two aspects:

[0036] 1. By setting two adjacent watertight doors at the end of the steel structure main beam, an isolation chamber is formed at the end of the steel structure main beam, which limits the direct exchange efficiency between the moist air outside the main beam and the dry air inside the main beam, reduces the number of dehumidifier operation, operation time and power consumption, saves the dehumidifier operation power consumption, and can also change the distance between the two watertight doors, adjust the volume of the isolation chamber, change the difficulty of air exchange between the main beam and the external space, save dehumidifier energy consumption, and improve the use efficiency of dehumidifiers; solves the current large steel structure bridge although there are multiple dehumidifiers installed in the beam, but the dehumidifier is not effective in dehumidification all year round, consumes a lot of power, and the bridge maintenance cost is high, The high energy consumption and other problems.

[0037] 2. Since the isolation chambers at both ends are the main spaces for exchanging external humid air and internal dry air, the air humidity is always in an unstable state, which is an environment that is prone to corrosion. Therefore, the corrosion rate of the isolation chamber can be reduced by strengthening the anti-corrosion coating grade of the isolation chamber and increasing the thickness of the anti-corrosion coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the anti-corrosion structure of Example 1;

[0039] In the figure: 1-outer watertight door; 2-inner watertight door; 3-dehumidifier; 4-beam end compartment; 5-dehumidifier layout compartment. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] An anti-corrosion structure for improving the energy efficiency of a dehumidifier 3 in a steel structure enclosed space, such as Figure 1 As shown, it is used for anti-corrosion of steel box beams, and the anti-corrosion structure includes a watertight door group and a dehumidifier 3 respectively arranged at the ends of both ends of the steel box beam;

[0043] The watertight door group comprises at least two watertight doors, the steel box beams between the watertight doors in the watertight door group form a beam end compartment 4, and the steel box beams between the watertight door groups form a dehumidifier arrangement compartment 5; each watertight door in the watertight door group is equipped with an independent watertight door motor;

[0044] The beam end compartment 4 is provided with a first humidity sensor;

[0045] The dehumidifier arrangement compartment 5 is provided with a dehumidifier 3, a second humidity sensor and a control system;

[0046] The control system is electrically connected to the watertight door motor, the dehumidifier 3, the first humidity sensor and the second humidity sensor.

[0047] More specifically, in this embodiment:

[0048] like Figure 1 As shown, in the scheme of this embodiment, two watertight doors are respectively provided at both ends of the steel box beam, including an outer watertight door 1 and an inner watertight door 2. An isolated compartment, the beam end compartment 4, is formed between the two watertight doors, and a dehumidifier arrangement compartment 5 for arranging a dehumidifier 3 is provided between the beam end compartments 4 at both ends. The two watertight doors are not opened at the same time, so that the air in the dehumidifier arrangement compartment 5 is always kept from directly exchanging gas with the outside atmosphere.

[0049] Furthermore, a first humidity sensor and a second humidity sensor are respectively installed inside the beam end compartment 4 and the dehumidifier arrangement compartment 5, for respectively measuring the humidity inside each of them; each watertight door is connected to the output end of its independently configured watertight door motor, and the watertight door is driven to open or close by the watertight door motor; a control system is also arranged inside the dehumidifier arrangement compartment 5, and the control system is electrically connected to the first humidity sensor, the second humidity sensor, the watertight door motor and the dehumidifier 3, respectively, for receiving data measured by the first humidity sensor and the second humidity sensor, and judging and instructing the operation of the watertight door motor and the dehumidifier 3 based on the comparison between the measured value and the set value, thereby controlling the opening and closing state of the watertight door and the start and stop state of the dehumidifier 3.

[0050] Since the beam end compartment 4 is located at the end of the steel box girder and it will directly contact and exchange with the external ambient air, the humidity inside it will be higher than the humidity of the dehumidifier arrangement compartment 5. In order to ensure the anti-corrosion effect of the beam end compartment 4 when dehumidification is not performed, a higher level of anti-corrosion coating grade is required in the beam end compartment 4. Specifically, the anti-corrosion coating grade complies with the anti-corrosion coating grade for the corresponding environmental category of the bridge in JT / T722-2023 (Technical Conditions for Anti-corrosion Coating of Steel Structures of Highway Bridges).

[0051] The width of the beam end compartment 4 can be designed to be 1-1.5 times the main beam height of the steel box beam, usually around 3-5m, according to different external environmental conditions and the anti-corrosion requirements of the steel box beam.

[0052] It can be seen that the steel box girder of the present scheme is provided with two watertight doors at both ends, so that the air in the internal main space is not directly exchanged with the external ambient air, but is indirectly exchanged with the external ambient air through the beam end compartment 4 formed at the end, which can effectively reduce the corrosion of the internal main space and shorten the operation time of the dehumidifier 3, thereby increasing the service life of the steel box girder and the dehumidifier 3 and reducing the maintenance and repair costs; at the same time, it is only necessary to use anti-corrosion coatings with a high anti-corrosion coating grade in the beam end compartment 4 with a smaller space, which can effectively reduce the anti-corrosion cost while ensuring the anti-corrosion effect.

[0053] The number of dehumidifiers 3 is determined according to the size of the steel box girder, and they can usually be arranged along the length or width of the steel box girder, and can also be arranged in an array to improve the dehumidification effect during operation. The specific number and specific arrangement positions of the dehumidifiers 3 should be determined based on the dehumidification range of a single dehumidifier 3 and the space that can be arranged in the bridge structure.

[0054] In actual use, the double set of watertight doors can be set to ensure that the outer watertight door 1 and the inner watertight door 2 are not opened at the same time. This reduces the exchange efficiency between the dry air in the dehumidifier arrangement chamber 5 and the external humid air, reduces the working time and energy consumption of the dehumidifier 3 in the dehumidifier arrangement chamber 5, and achieves the purpose of saving electricity, improving the energy efficiency of the dehumidifier 3, and reducing the management and maintenance costs of the bridge.

[0055] Furthermore, the anti-corrosion structure provided in this embodiment is also equipped with a matching anti-corrosion method.

[0056] The anti-corrosion method mainly detects the humidity conditions in the beam end compartment 4 and the dehumidifier arrangement compartment 5 respectively through the first humidity sensor and the second humidity sensor, and inputs the real-time humidity data into the control system for comparison. The control system determines whether it is necessary to adjust the operating status of the inner watertight door and the dehumidifier 3 based on the comparison result. If adjustment is required, the control system instructs the watertight door motor and the dehumidifier 3 to adjust the watertight door and the dehumidifier 3.

[0057] Generally, the internal humidity of the steel box girder should be maintained within the standard humidity range below 45%. When the humidity exceeds 60%, the corrosion rate of steel will increase exponentially. Therefore, in this specific anti-corrosion method: the humidity setting value of the beam end compartment 4 is set to 60%, and the humidity setting value of the dehumidifier layout compartment 5 is set to 45%.

[0058] Based on this:

[0059] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment 5 is less than 45% and the first humidity sensor measures that the real-time humidity in the beam end compartment 4 is less than 60%, the dehumidifier 3 does not operate and the inner watertight door 2 is closed;

[0060] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment 5 is less than 45% and the first humidity sensor measures that the real-time humidity in the beam end compartment 4 is greater than or equal to 60%, the dehumidifier 3 does not operate and the inner watertight door 2 opens;

[0061] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment 5 is greater than or equal to 45% and the first humidity sensor measures that the real-time humidity in the beam end compartment 4 is greater than or equal to 60%, the dehumidifier 3 operates and the inner watertight door 2 opens;

[0062] When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment 5 is greater than or equal to 45% and the first humidity sensor measures that the real-time humidity in the beam end compartment 4 is less than 60%, the dehumidifier 3 operates and the inner watertight door 2 is closed.

[0063] In addition, when the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment 5 is less than 20% and the difference between the real-time humidity in the beam end compartment 4 measured by the first humidity sensor and the real-time humidity in the dehumidifier arrangement compartment 5 is greater than or equal to 40%, the dehumidifier 3 can be operated additionally and the inner watertight door 2 can be opened to perform pre-dehumidification to avoid excessive dehumidification pressure after the humidity is simultaneously increased, which makes it difficult to dehumidify quickly.

[0064] For steel box girders in different application environments, the specific set values ​​(including the humidity set values ​​of the dehumidifier layout compartment and the beam end compartment) should be determined according to the specific environment and specific anti-corrosion requirements and other restrictions. Usually, the humidity of the dehumidifier layout compartment can be set within the range of 20-60%, and the humidity of the beam end compartment can be set within the range of 50-90%.

[0065] To ensure the accuracy of humidity detection, temperature sensors can be provided in the beam end compartment 4 and the dehumidifier arrangement compartment 5 to calibrate humidity data. Multiple temperature sensors can be provided according to the size of the space, and each of them is electrically connected to the control system. The average value or median value can be taken as the regional temperature representative according to actual needs.

[0066] In order to better implement the regulation of dehumidification, the neural network algorithm can also be introduced into the control system for predictive control. At this time, the control system includes a prediction module, a communication module, a comparison module and an instruction module; the communication module forms a communication connection with an external data transceiver device (such as a wireless connection) for receiving data such as real-time weather data and weather forecasts, and can also be used to provide humidity data and dehumidification conditions in the steel box girder to the outside, and can also be used for time calibration; the output end of the communication module and the first humidity sensor, the second humidity sensor and the temperature sensor are connected to the prediction module, and the collected and acquired data are input into the prediction module, and the prediction module is loaded with a neural network algorithm for predicting the humidity change prediction curve inside the beam end compartment 4 and the dehumidifier arrangement compartment 5; the output end of the prediction module is further connected to the comparison module, and the humidity change prediction curve output by the prediction module is compared with the preset set value in the comparison module, and the prediction and regulation can be performed according to the dehumidification method proposed above; the output end of the comparison module is connected to the instruction module, and the instruction module instructs the operation of the watertight door motor and the dehumidifier 3 based on the comparison result of the comparison module. The neural network algorithm uses the humidity data measured by the first humidity sensor and the second humidity sensor, the temperature data measured by the temperature sensor, the weather data outside the steel box girder, the arrangement and operation time of the dehumidifier 3, the opening and closing status of the watertight door group, the total length of the steel box girder, the width of the beam end compartment 4 and the time data as input, and uses the humidity change prediction curve as output; the neural network algorithm uses past data as a training set, and can use the process that has occurred as a correction set; the neural network can select one or more combinations such as BP neural network, RNN, LSTM, GRU, CNN, etc. according to actual needs.

[0067] In summary,

[0068] 1. The present invention mainly proposes a method for anti-corrosion of a closed space of a steel structure. This method is mainly based on improving the energy efficiency of the dehumidifier 3 and proposes two key points. One key point is to set a double set of watertight doors at the ends of the steel box beam to form an independent beam end compartment 4, which serves the purpose of directly exchanging the air in the dehumidifier arrangement compartment 5 with the outside atmosphere, thereby reducing the working time and power consumption of the dehumidifier 3 and reducing the energy efficiency of the dehumidifier 3. Another key point is to achieve the purpose of strengthening the anti-corrosion of the steel beam inside the dehumidifier arrangement compartment 5 by thickening the anti-corrosion coating of the beam end compartment 4.

[0069] 2. A double set of watertight doors are arranged at both ends of the steel box beam to form an independent beam end compartment 4, thereby improving the use efficiency of the dehumidifier 3, and can be widely used in bridge structures, building steel structures and other steel structure enclosed spaces.

[0070] 3. The setting of double-group watertight doors is different from the traditional single-layer watertight doors. The beam end compartment 4 formed by the double-group watertight doors at the beam end isolates the outside air from the air exchange inside the dehumidifier arrangement compartment 5, improving the problem of direct exchange of air between the dehumidifier arrangement compartment 5 and the outside air caused by only setting a single-layer watertight door, improving the energy efficiency of the dehumidifier 3, reducing the working time of the dehumidifier 3, saving working power consumption, and reducing the cost of bridge maintenance.

[0071] 4. By adjusting the spacing between the double sets of watertight doors, the space size of the beam end compartment 4 is adjusted, and by comparing parameters, a reasonable spacing between the double sets of doors is determined.

[0072] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure, used for anti-corrosion of a steel box girder, characterized in that: The anti-corrosion structure comprises a watertight door group and a dehumidifier (3) respectively arranged at both ends of the steel box beam; The watertight door group comprises at least two watertight doors, the steel box beams between the watertight doors in the watertight door group form a beam end compartment (4), and the steel box beams between the watertight door groups form a dehumidifier arrangement compartment (5); each watertight door in the watertight door group is equipped with an independent watertight door motor; The beam end compartment (4) is provided with a first humidity sensor; The dehumidifier arrangement compartment (5) is provided with a dehumidifier (3), a second humidity sensor and a control system; The control system is electrically connected to the watertight door motor, the dehumidifier (3), the first humidity sensor and the second humidity sensor.

2. The anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 1, characterized in that: The watertight door group is a double-channel watertight door, which is composed of an outer watertight door (1) and an inner watertight door (2).

3. The anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 1, characterized in that: The anti-corrosion coating grade in the beam end compartment (4) is higher than the anti-corrosion coating grade in the dehumidifier arrangement compartment (5).

4. The anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 1, characterized in that: The anti-corrosion coating grade in the beam end compartment (4) complies with JT / T 722-2023.

5. The anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 1, characterized in that: The dehumidifiers (3) are provided in a plurality of sets, which are arranged along the length or width direction of the steel box girder, or arranged in an array form inside the steel box girder.

6. The anti-corrosion structure for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 1, characterized in that: The width of the beam end compartment (4) is 1-1.5 times the height of the main beam of the steel box beam.

7. A method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure, characterized in that: Adopting the anti-corrosion structure as described in any one of claims 1 to 6; The humidity in the beam end compartment (4) and the dehumidifier arrangement compartment (5) is measured respectively by a first humidity sensor and a second humidity sensor, and the measured humidity data is sent to a control system; the control system compares the relationship between the measured value and the set value, and instructs the operation of the watertight door motor and / or the dehumidifier (3) according to the comparison result.

8. The anti-corrosion method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 7, characterized in that: The first setting value of the dehumidifier arrangement compartment (5) is 20-60%, and the second setting value of the beam end compartment (4) is 50-90%; When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment (5) is less than the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment (4) is less than the second set value, the dehumidifier (3) does not operate and the non-outermost watertight door in the watertight door group is closed; When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment (5) is less than the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment (4) is greater than or equal to the second set value, the dehumidifier (3) does not operate, and the non-outermost watertight door in the watertight door group opens; When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment (5) is greater than or equal to the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment (4) is greater than or equal to the second set value, the dehumidifier (3) operates and the non-outermost watertight door in the watertight door group opens; When the second humidity sensor measures that the real-time humidity in the dehumidifier arrangement compartment (5) is greater than or equal to the first set value and the first humidity sensor measures that the real-time humidity in the beam end compartment (4) is less than the second set value, the dehumidifier (3) operates and the non-outermost watertight door in the watertight door group is closed; The outermost watertight door and the non-outermost watertight doors in the watertight door group are not opened at the same time.

9. The anti-corrosion method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 7, characterized in that: The anti-corrosion structure further comprises temperature sensors respectively arranged inside the beam end compartment (4) and the dehumidifier arrangement compartment (5); the temperature sensors are electrically connected to the control system and are used to correct the measured value of humidity.

10. The anti-corrosion method for improving the energy efficiency of a dehumidifier in a closed space of a steel structure according to claim 9, characterized in that: The control system comprises a prediction module, a communication module, a comparison module and an instruction module, the input end of the communication module is connected to an external data transceiver device, the output end of the communication module, the first humidity sensor, the second humidity sensor and the temperature sensor are connected to the input end of the prediction module, the output end of the prediction module is connected to the input end of the comparison module, the output end of the comparison module is connected to the input end of the instruction module, and the output end of the instruction module is connected to the watertight door motor and the dehumidifier (3); The prediction module is loaded with a neural network algorithm, which takes the humidity data measured by the first humidity sensor and the second humidity sensor, the temperature data measured by the temperature sensor, the weather data outside the steel box girder, the arrangement mode and the operation time of the dehumidifier (3), the opening and closing state of the watertight door group, the total length of the steel box girder, the width of the beam end compartment (4) and the time data as input, and takes the humidity change prediction curve in the beam end compartment (4) and the dehumidifier arrangement compartment (5) as output, and the instruction module implements the instruction based on the comparison result of the humidity change prediction curve and the set value in the comparison module; The humidity change prediction curve is a curve of humidity and time; The neural network algorithm uses past data as a training set.

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