A variable air volume dehumidification system for a suspension bridge and a control method thereof

Abstract

The application discloses a suspension bridge variable air volume dehumidification system, which comprises a condensation dehumidification module, a rotary dehumidification module, a sensible heat exchanger and a processing / regeneration air flow path. In the processing air flow path, outdoor air is pre-cooled and dehumidified by an evaporator and then is divided into two paths by a shunt valve: one path directly passes through a mixing section through a bypass branch, and the other path enters the mixing section after sequentially passing through a rotary dehumidification module processing area and a first channel of the sensible heat exchanger through a deep dehumidification branch, and then is sent into a main cable by a supply fan after mixing. In the regeneration air flow path, outdoor air sequentially passes through a condenser, a second channel of the sensible heat exchanger, an electric heater step heating after passing through a regeneration fan, and then is discharged after entering a rotary regeneration area. A refrigeration cycle unit of the condensation dehumidification module transfers the heat of the evaporator to the regeneration air flow path through the condenser to realize energy recovery. The application reduces the load of the rotary dehumidification module and the regeneration energy consumption through condensation-rotary dehumidification cooperation and shunt mixing, realizes energy saving optimization through step heating efficiency improvement and variable air volume control adaptability.

Description

Technical Field

[0001] This invention relates to the field of humidity control technology for main cables of suspension bridges, and in particular to a variable air volume dehumidification system and control method for suspension bridges. Background Technology

[0002] As a representative of modern long-span bridges, suspension bridges rely heavily on their main cables, which are the core load-bearing components. Long-term exposure to the natural environment makes these cables highly susceptible to corrosion from humid air. When the relative humidity exceeds 60%, the corrosion rate increases exponentially, posing a significant threat to bridge safety. Using dehumidification equipment to prepare dry air and introduce it into the cables, maintaining a low relative humidity environment, can achieve an active corrosion prevention effect.

[0003] Currently, dehumidification of bridges mostly uses rotary dehumidifiers. Rotary dehumidifiers are commonly used in mild and humid climates. However, in hot summers and cold winters, and in high-temperature and high-humidity environments, single rotary dehumidifier systems have the following shortcomings: Rotary dehumidifier systems rely on the adsorption / desorption process of the moisture-absorbing material. Under conditions of large fluctuations in humidity load, such as high temperature and high humidity, the moisture content of the treated air is high, and the adsorption load of the rotary wheel increases. To maintain low outlet humidity, it is usually necessary to increase the regeneration air temperature and the regeneration air volume, resulting in a significant increase in regeneration heating energy consumption. At the same time, to meet the peak dehumidification demand in summer, the equipment is often selected based on extreme operating conditions, causing the system to operate at low load for a long time under most normal operating conditions. This results in high energy consumption and limited control and adjustment range. Furthermore, when operating conditions fluctuate, single rotary dehumidifier schemes are prone to over-regeneration in order to maintain outlet humidity, further increasing energy consumption and operating costs.

[0004] While the use of a rotary dehumidifier-condenser co-dehumidification system reduces the overall energy consumption of the system by employing the lower-energy-consumption condenser pre-dehumidification, the remaining load requiring deep dehumidification still accounts for a large portion of the energy consumption. Therefore, how to meet the low humidity requirements of the air supply for corrosion protection of the main cable of the suspension bridge, while simultaneously reducing the energy consumption of the rotary dehumidifier and improving the system's operating efficiency under high temperature, high humidity, and all operating conditions, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a variable air volume dehumidification system and control method for suspension bridges, thereby solving the technical problem of the lack of existing technologies that can simultaneously meet the requirements for low humidity in the air supply and operate with low power consumption.

[0006] This invention provides a variable air volume dehumidification system for suspension bridges, comprising:

[0007] Condensation dehumidification module, rotary dehumidification module, sensible heat exchanger, processing air flow path, regeneration air flow path, supply air flow path, and splitting and mixing unit;

[0008] The air handling path includes: a first handling fan, an evaporator, a diversion valve, a deep dehumidification branch, a bypass branch, a mixing section, and a supply fan; outdoor air enters the evaporator via the first handling fan for pre-cooling and dehumidification, and the outlet of the evaporator is connected to the inlet of the diversion valve; the first outlet of the diversion valve is connected to the mixing section via the bypass branch; the second outlet of the diversion valve is connected to the mixing section via the deep dehumidification branch, and the deep dehumidification branch is sequentially equipped with a processing area of ​​a rotary dehumidification module and a first channel of a sensible heat exchanger connected to the processing side; in the supply air path, the outlet of the mixing section is connected to the inside of the main cable via the supply fan;

[0009] The regenerated air flow path includes: a regenerated fan, a condenser, a second channel of the sensible heat exchanger, and an electric heater; after the outdoor air passes through the regenerated fan, it passes through the condenser, the second channel of the sensible heat exchanger, and the electric heater in sequence to be heated, and then enters the regeneration zone of the rotary dehumidification module, and is finally discharged.

[0010] The condensation dehumidification module includes a refrigeration cycle unit, which includes a compressor, condenser, expansion valve and evaporator connected by pipelines; the condenser is coupled to the evaporator to transfer the heat absorbed by the evaporator to the regeneration air flow path to achieve energy recovery.

[0011] Furthermore, the first channel of the sensible heat exchanger is a processing-side channel, and the second channel of the sensible heat exchanger is a regeneration-side channel; the outlet of the processing-side channel is connected to the mixing section, the inlet of the regeneration-side channel is connected to the outlet of the condenser, and its outlet is connected to the inlet of the electric heater.

[0012] Furthermore, the diversion valve is a three-way regulating valve or a damper, and the ratio of the treated air volume to the bypass air volume can be continuously adjusted by adjusting the opening of the diversion valve; the mixing valve is a three-way regulating valve or a damper, and the moisture content of the supplied air can be mixed and adjusted by adjusting the mixing valve.

[0013] Furthermore, the suspension bridge variable air volume dehumidification system also includes: a controller and at least two humidity sensors; the humidity sensors are respectively installed at the outlet of the evaporator and at the air supply path or mixing section; the controller adjusts the diversion valve and / or mixing valve according to the comparison result of the air humidity parameter at the evaporator outlet and the target air supply humidity to change the proportion of processed air entering the deep dehumidification branch.

[0014] Furthermore, the controller also adjusts the speed of the supply fan and / or the speed of the regenerator fan based on the deviation between the supply air humidity parameter at the supply air flow path or mixing section and the target supply air humidity, thereby achieving variable air volume operation.

[0015] Furthermore, the suspension bridge variable air volume dehumidification system also includes: a regeneration temperature sensor installed in the regeneration air flow path; the controller adjusts the output power of the electric heater according to the deviation between the temperature detected by the regeneration temperature sensor and the set regeneration temperature.

[0016] The present invention also provides a control method for a variable air volume dehumidification system for a suspension bridge, comprising:

[0017] Acquire outdoor air temperature and humidity parameters, evaporator outlet air humidity parameters, and supply air humidity parameters, and set the target supply air relative humidity threshold.

[0018] When the humidity parameters of the air at the evaporator outlet meet the air supply requirements, the opening of the diversion valve is controlled so that more than half or all of the air volume enters the mixing section through the bypass branch, and the operating load of the rotary dehumidification module is reduced or it is put into standby mode, relying solely on the condensation dehumidification module to achieve air supply.

[0019] When the humidity parameters of the air at the evaporator outlet do not meet the air supply requirements and the air is in a high humidity condition, the opening of the diversion valve is controlled so that at least part of the processed air enters the deep dehumidification branch, the rotary dehumidification module is started, the regeneration air flow path is opened, and the power of the electric heater is adjusted so that the regeneration air reaches the set temperature.

[0020] Furthermore, the specific method for reducing the operating load of the rotary dehumidification module is to reduce the speed of the regeneration fan or stop the regeneration fan, and / or reduce the output power of the electric heater.

[0021] Furthermore, when the humidity parameters of the air at the evaporator outlet do not meet the air supply requirements and the environment is under extremely high humidity conditions, the method also includes: controlling the opening of the mixing valve and adjusting the mixing ratio of the bypass branch and the deep dehumidification branch to ensure that the air supply humidity meets the requirements.

[0022] Furthermore, the high humidity condition includes general high humidity condition and extreme high humidity condition; when the humidity parameter of the air at the evaporator outlet is in general high humidity condition, the flow divider valve is controlled to allow the first proportion of processed air to enter the deep dehumidification branch.

[0023] When the humidity parameter of the air at the evaporator outlet is in an extremely high humidity condition, the control diversion valve allows the second proportion of processed air to enter the deep dehumidification branch, where the second proportion is greater than the first proportion.

[0024] The beneficial effects of this invention are:

[0025] This invention expands the system's humidity handling range and improves the adaptability of suspension bridges to varying environments by combining condensation pretreatment with deep dehumidification of the impeller and adjusting the treatment airflow by splitting and mixing.

[0026] Compared to conventional condenser-rotor co-processing systems, this invention further reduces the rotor processing air volume requirement by performing deep dehumidification on a portion of the processed air, thereby significantly reducing rotor capacity and regeneration heat load, and thus reducing operating energy consumption and equipment costs.

[0027] This invention significantly improves system energy efficiency and reduces regeneration energy consumption through a tiered regeneration heating method consisting of "condenser waste heat preheating + sensible heat exchanger recovery preheating + electric heating terminal supplementary heating".

[0028] This invention achieves variable air volume operation and supply air humidity control through diversion valves and mixing valves. Compared with the condenser-rotor coordinated system, it has greater environmental adaptability and can optimize energy consumption while meeting the supply air humidity requirements. Attached Figure Description

[0029] The features and advantages of the invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the drawings:

[0030] Figure 1 This is a system schematic diagram of a specific embodiment of the present invention;

[0031] Figure 2 This is a specific embodiment of the processing flow on the enthalpy-humidity chart of the present invention;

[0032] Figure 3 This is a flowchart illustrating a specific embodiment of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further illustrated below with reference to specific embodiments. Those skilled in the art should understand that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Modifications to the present invention in various equivalent forms all fall within the scope defined by the appended claims.

[0035] like Figure 1 As shown, the present invention provides a variable air volume dehumidification system for suspension bridges, comprising three parts: an air handling unit, an air regeneration unit, and a condensation dehumidification unit.

[0036] After being pre-dehumidified by the evaporator of the condenser-dehumidifier, the ambient air enters the air handling unit and is divided into two streams by a flow divider valve. One stream is sent to the dehumidifier of the rotary dehumidifier for deep dehumidification, then exchanges heat with the heat exchanger before being mixed with the other stream and finally sent into the main cable bushing of the bridge. In the regeneration unit, the ambient air first undergoes primary preheating by the condenser of the condenser-dehumidifier, then secondary preheating by the heat exchanger, and finally is heated to 120°C in the electric heater before being sent to the regeneration side of the rotary dehumidifier.

[0037] Air handling process:

[0038] The air handling process includes, in sequence: air handling fan 11, evaporator 12, diversion valve 13, rotary dehumidifier 14 (dehumidification zone), heat exchanger 23 (handling side), mixing valve 15, and supply fan 16.

[0039] The evaporator 12 is used to pre-cool and dehumidify the incoming outdoor air, and the diversion valve 13 is used to divide the air that has been pre-cooled and dehumidified by the evaporator 12 into two streams:

[0040] First processing branch: It is led out from the diversion air valve 13 and enters the dehumidification zone of the rotary dehumidifier 14 for deep dehumidification, then enters the processing side of the heat exchanger 23 for heat exchange, and then enters the mixing air valve 15.

[0041] The second processing branch is led out from the diversion air valve 13 and bypasses the rotary dehumidifier 14 and heat exchanger 23, and directly enters the mixing air valve 15;

[0042] After the two streams of processed air are mixed at the mixing valve 15, they are sent into the main cable duct of the bridge by the blower 16.

[0043] Regenerated air process:

[0044] The regenerated air process includes, in sequence: regenerated fan 21, condenser 22, heat exchanger 23 (regeneration side), electric heater 24, and rotary dehumidifier 14 (regeneration zone).

[0045] The regeneration fan 21 introduces outdoor air into the regeneration air path. The regeneration air first flows through the condenser 22 to be preheated, and then enters the regeneration side of the heat exchanger 23 to perform heat recovery and heat exchange with the processing side. After being reheated by the electric heater 24 to the temperature required for rotor regeneration (120°C), it enters the regeneration zone of the rotor dehumidifier 14 to regenerate the dehumidified rotor. The regenerated hot and humid air is discharged from the rotor dehumidifier 14.

[0046] Condensation Dehumidification Refrigeration Circuit

[0047] The condensing dehumidification refrigeration circuit consists of a compressor 31, a condenser 22, an expansion valve 32, and an evaporator 12 connected in sequence to form a closed-loop circuit. After being compressed by the compressor 31, the refrigerant enters the condenser 22 to release heat and condense. Then, after being throttled and depressurized by the expansion valve 32, it enters the evaporator 12 to evaporate and absorb heat, thereby achieving pre-cooling and dehumidification of the processed air. After evaporation, the refrigerant returns to the compressor 31 to complete the cycle.

[0048] Preferably, the condenser 22 is arranged in the regeneration air flow so that the condensation heat released by the refrigeration circuit is preferentially used for preheating the regeneration air, thereby reducing the heat replenishment requirement of the electric heater 24.

[0049] A specific embodiment of the present invention also provides a method for using a variable air volume dehumidification system for suspension bridges, wherein the proportion of the diversion valve is controlled according to environmental parameters, and the regeneration air circuit is controlled according to the proportion of the diversion valve.

[0050] like Figure 2 As shown, the curve is the 100% relative humidity line. A is the outdoor air state point, C is the evaporator 12 outlet air state point, D is the rotary dehumidifier 14 processing area outlet air state point, E is the heat exchanger 23 cold side outlet air state point, F is the mixing air valve 15 outlet state point, H is the condenser 22 outlet state point, and I is the heat exchanger heat measurement outlet state point.

[0051] The air handling process in this example is as follows: Outdoor air at point A is pre-dehumidified by evaporator 12, becoming point C. It then enters rotary dehumidifier 14 for further dehumidification, becoming point D. After heat exchange in heat exchanger 23, it reaches point E, and then enters mixing valve 15 for mixing before being delivered to point F. The air regeneration process is as follows: Outdoor air at point A is preheated by condenser 22, becoming point H. It then enters heat exchanger 23 to point I, and finally is reheated to 120°C by electric heater before being sent to the regeneration zone of rotary dehumidifier 14.

[0052] Under high temperature and high humidity conditions:

[0053] In the condensing dehumidification refrigeration circuit, the exhaust port of the compressor 31 is connected to the refrigerant inlet of the condenser 22, the refrigerant outlet of the condenser 22 is connected to the inlet of the expansion valve 32, the outlet of the expansion valve 32 is connected to the refrigerant inlet of the evaporator 12, and the refrigerant outlet of the evaporator 12 is connected to the suction port of the compressor 31, forming a closed refrigeration cycle circuit. The evaporator 12 is arranged in the processing air pipeline to pre-cool and dehumidify the processing air, and the condenser 22 is arranged in the regeneration air pipeline to release heat to the regeneration air and realize the waste heat recovery and preheating of the regeneration air, thereby reducing the terminal heat supplement load of the electric heater 24.

[0054] In the air handling process, outdoor air is introduced into the handling air duct via the handling air fan 11. The outlet of the handling air fan 11 is connected to the inlet of the evaporator 12, and the outlet of the evaporator 12 is connected to the inlet of the diverter valve 13. The first outlet of the diverter valve 13 is connected to the dehumidification zone inlet of the rotary dehumidifier 14, the dehumidification zone outlet of the rotary dehumidifier 14 is connected to the handling side channel inlet of the heat exchanger 23, and the handling side channel outlet of the heat exchanger 23 is connected to one of the mixing valves 15. The inlet is connected to form a deep dehumidification branch; the second outlet of the diversion valve 13 bypasses the rotary dehumidifier 14 and heat exchanger 23 and is connected to the other inlet of the mixing valve 15, forming a bypass branch; the outlet of the mixing valve 15 is connected to the inlet of the blower 16, and the outlet of the blower 16 is connected to the air supply duct of the main cable of the suspension bridge, so that the two streams of treated air are mixed at the mixing valve 15 in a set ratio to form air supply and be sent into the main cable duct to maintain the relative humidity inside the main cable to meet the corrosion prevention requirements.

[0055] In the regeneration air process, outdoor air is introduced into the regeneration air pipeline via the regeneration fan 21. The outlet of the regeneration fan 21 is connected to the air-side inlet of the condenser 22, the air-side outlet of the condenser 22 is connected to the regeneration-side channel inlet of the heat exchanger 23, the regeneration-side channel outlet of the heat exchanger 23 is connected to the inlet of the electric heater 24, the outlet of the electric heater 24 is connected to the regeneration zone inlet of the rotary dehumidifier 14, and the regeneration zone outlet of the rotary dehumidifier 14 is connected to the exhaust duct and discharged outside the system. The heat exchanger 23 is used to perform sensible heat recovery and heat exchange between the air (processing side) in the deep dehumidification branch and the regeneration air (regeneration side). The regeneration air is preheated by the condenser 22 in sequence, preheated by the heat exchanger 23 in sequence, and then supplemented by the electric heater 24 at the end to the set regeneration temperature before entering the regeneration zone of the rotary dehumidifier 14 to complete the regeneration.

[0056] Under low-temperature operating conditions:

[0057] The system does not activate the condensation dehumidification refrigeration circuit, that is, the compressor 31 is stopped, the expansion valve 32 is closed or remains closed, so that the refrigerant does not circulate between the condenser 22 and the evaporator 12; the air duct components corresponding to the evaporator 12 and the condenser 22 only serve as air passage components for air to pass through, and do not perform condensation pre-dehumidification and condensation heat release preheating processes.

[0058] Outdoor air is introduced into the treated air duct via the treated air fan 11. The outlet of the treated air fan 11 is connected to the inlet of the evaporator 12, and the outlet of the evaporator 12 is connected to the inlet of the diverter valve 13. The first outlet of the diverter valve 13 is connected to the inlet duct of the dehumidification zone of the rotary dehumidifier 14, allowing a portion of the treated air to enter the dehumidification zone of the rotary dehumidifier 14 for deep dehumidification. The outlet of the dehumidification zone of the rotary dehumidifier 14 is connected to the inlet duct of the treated side channel of the heat exchanger 23. The outlet of the treatment channel is connected to one inlet pipe of the mixing valve 15; the second outlet of the diversion valve 13 is connected to the other inlet pipe of the mixing valve 15, so that another part of the treated air bypasses the rotary dehumidifier 14 and the heat exchanger 23 and enters the mixing valve 15 directly; the outlet of the mixing valve 15 is connected to the inlet pipe of the blower 16, and the outlet of the blower 16 is connected to the main cable air supply pipe of the suspension bridge, so that the two treated airs are mixed at the mixing valve 15 and then sent into the main cable pipe by the blower 16.

[0059] Outdoor air is introduced into the regeneration air duct via regeneration fan 21. The outlet of regeneration fan 21 is connected to the air-side inlet duct of condenser 22. After flowing through condenser 22, the regeneration air is connected to the regeneration-side channel inlet duct of heat exchanger 23. The regeneration-side channel outlet of heat exchanger 23 is connected to the inlet duct of electric heater 24. The outlet of electric heater 24 is connected to the regeneration zone inlet duct of rotary dehumidifier 14. After being reheated to the set regeneration temperature by electric heater 24, the regeneration air enters the regeneration zone of rotary dehumidifier 14 to regenerate the rotor. The regenerated hot and humid air is discharged from the regeneration zone outlet of rotary dehumidifier 14.

[0060] like Figure 3The diagram shows a control flow diagram of an embodiment of the present invention. After the process begins, the air supply system is started first, and the fan 11, three-way valve 13, and fan 16 are turned on in sequence. Then, the rotary dehumidification system is started, and the regenerator fan 21, electric heater 24, and rotary wheel 14 are turned on. The humidity setpoint SD and the temperature and humidity data at points A, E, and F are collected. The system uses the humidity at point F as the main control variable for judgment: if the humidity at point F is greater than SD, the power of the rotary dehumidification system is first adjusted to enhance dehumidification and then delayed for 15 minutes. After the delay, it is judged again whether the humidity at point F is still greater than SD. If it is still exceeded, the condenser dehumidification unit is turned on (compressor 31 is started) and then delayed for another 15 minutes. After the delay, if the humidity at point F is still greater than SD, a humidity over-limit alarm is triggered. If the humidity at point F is no longer greater than SD after the rotary adjustment or condenser dehumidification, the subsequent judgment is performed. Next, it is determined whether the humidity at point F is equal to SD. If it is, the process ends. If it is not equal, the temperature relationship is further compared: it is determined whether the temperature at point F is less than the temperature at point A. If the temperature at point F is less than the temperature at point A, the opening of the three-way valve 13 is adjusted to correct it, and the process is repeatedly checked whether the temperature at point F is still less than the temperature at point A and whether the humidity at point F reaches SD. If the conditions are not met, the three-way valve 13 is adjusted until they are met, and then the process returns to the main process and finally ends.

[0061] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A variable air volume dehumidification system for suspension bridges, characterized in that, include: Condensation dehumidification module, rotary dehumidification module, sensible heat exchanger, processing air flow path, regeneration air flow path, supply air flow path, and splitting and mixing unit; The air handling path includes: a first handling fan, an evaporator, a diversion valve, a deep dehumidification branch, a bypass branch, a mixing section, and a supply fan; outdoor air enters the evaporator via the first handling fan for pre-cooling and dehumidification, and the outlet of the evaporator is connected to the inlet of the diversion valve; the first outlet of the diversion valve is connected to the mixing section via the bypass branch; the second outlet of the diversion valve is connected to the mixing section via the deep dehumidification branch, and the deep dehumidification branch is sequentially equipped with a processing area of ​​a rotary dehumidification module and a first channel of a sensible heat exchanger connected to the processing side; in the supply air path, the outlet of the mixing section is connected to the inside of the main cable via the supply fan; The regenerated air flow path includes: a regenerated fan, a condenser, a second channel of the sensible heat exchanger, and an electric heater; after the outdoor air passes through the regenerated fan, it passes through the condenser, the second channel of the sensible heat exchanger, and the electric heater in sequence to be heated, and then enters the regeneration zone of the rotary dehumidification module, and is finally discharged. The condensation dehumidification module includes a refrigeration cycle unit, which includes a compressor, condenser, expansion valve and evaporator connected by pipelines; the condenser is coupled to the evaporator to transfer the heat absorbed by the evaporator to the regeneration air flow path to achieve energy recovery.

2. The variable air volume dehumidification system for suspension bridges as described in claim 1, characterized in that, The first channel of the sensible heat exchanger is the processing side channel, and the second channel of the sensible heat exchanger is the regeneration side channel; the outlet of the processing side channel is connected to the mixing section, the inlet of the regeneration side channel is connected to the outlet of the condenser, and its outlet is connected to the inlet of the electric heater.

3. The variable air volume dehumidification system for suspension bridges as described in claim 1, characterized in that, The diversion valve is a three-way regulating valve or a damper, and the ratio of the processing air volume to the bypass air volume can be continuously adjusted by adjusting the opening of the diversion valve; the mixing valve is a three-way regulating valve or a damper, and the moisture content of the supply air can be mixed and adjusted by adjusting the mixing valve.

4. The variable air volume dehumidification system for suspension bridges as described in claim 1, characterized in that, The suspension bridge variable air volume dehumidification system also includes: a controller and at least two humidity sensors; the humidity sensors are respectively installed at the outlet of the evaporator and at the air supply path or mixing section; the controller adjusts the diversion valve and / or mixing valve according to the comparison result of the air humidity parameter at the evaporator outlet and the target air supply humidity to change the proportion of processed air entering the deep dehumidification branch.

5. The variable air volume dehumidification system for suspension bridges as described in claim 1, characterized in that, The controller also adjusts the speed of the supply fan and / or the speed of the regenerator fan based on the deviation between the supply air humidity parameter at the supply air flow path or mixing section and the target supply air humidity, thereby achieving variable air volume operation.

6. The variable air volume dehumidification system for suspension bridges as described in claim 1, characterized in that, The suspension bridge variable air volume dehumidification system also includes: a regeneration temperature sensor installed in the regeneration air flow path; the controller adjusts the output power of the electric heater according to the deviation between the temperature detected by the regeneration temperature sensor and the set regeneration temperature.

7. A control method for a variable air volume dehumidification system for a cable-stayed bridge as described in any one of claims 1-6, characterized in that, include: Acquire outdoor air temperature and humidity parameters, evaporator outlet air humidity parameters, and supply air humidity parameters, and set the target supply air relative humidity threshold. When the humidity parameters of the air at the evaporator outlet meet the air supply requirements, the opening of the diversion valve is controlled so that more than half or all of the air volume enters the mixing section through the bypass branch, and the operating load of the rotary dehumidification module is reduced or it is put into standby mode, relying solely on the condensation dehumidification module to achieve air supply. When the humidity parameters of the air at the evaporator outlet do not meet the air supply requirements and the air is in a high humidity condition, the opening of the diversion valve is controlled so that at least part of the processed air enters the deep dehumidification branch, the rotary dehumidification module is started, the regeneration air flow path is opened, and the power of the electric heater is adjusted so that the regeneration air reaches the set temperature.

8. The control method for the variable air volume dehumidification system of the cable-stayed bridge as described in claim 7, characterized in that, The specific methods for reducing the operating load of the rotary dehumidification module are as follows: reducing the speed of the regeneration fan or stopping the regeneration fan, and / or reducing the output power of the electric heater.

9. The control method for the variable air volume dehumidification system of the cable-stayed bridge as described in claim 7, characterized in that, When the humidity parameters of the air at the evaporator outlet do not meet the air supply requirements and the air is in a high humidity condition, the following measures are also taken: control the opening of the mixing valve and adjust the mixing ratio of the bypass branch and the deep dehumidification branch to ensure that the air supply humidity meets the requirements.

10. The control method for the variable air volume dehumidification system of the cable-stayed bridge as described in claim 9, characterized in that, The high humidity conditions include general high humidity conditions and extreme high humidity conditions; when the humidity parameter of the air at the evaporator outlet is in the general high humidity condition, the flow divider valve is controlled to allow the first proportion of processed air to enter the deep dehumidification branch. When the humidity parameter of the air at the evaporator outlet is in an extremely high humidity condition, the control diversion valve allows the second proportion of processed air to enter the deep dehumidification branch, where the second proportion is greater than the first proportion.

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