Safety protection control system and method for air conditioning system

Abstract

The invention discloses a safety protection control system and method for an air conditioning system. The system comprises a first air duct and a second air duct which communicate with each other; the return fan is arranged in the first air duct; the air feeder is arranged in the second air duct; the controller is electrically connected with the return fan and the air feeder; a plurality of steam pipelines are arranged on the second air duct; a steam humidifying valve, a steam heating valve and a refrigerating valve are arranged on each steam pipeline; an air supply temperature and humidity sensor and a micro-fog humidifier are arranged on the second air duct; the air supply temperature and humidity sensor, the micro-mist humidifier, the steam humidification valve, the steam heating valve and the refrigeration valve are all electrically connected with the controller. According to the scheme, the occurrence probability of dangerous accidents is effectively reduced, and the personal safety of related personnel and the equipment safety of the air conditioning unit are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to a safety protection control system and method for an air conditioning system. Background Technology

[0002] As a critical piece of equipment in cigarette manufacturing, the development of safety protection technologies for modular air conditioning systems has always been closely linked to industrial needs. This system, integrating functional modules such as air handling, temperature and humidity control, and fresh air supply, is widely used in environments including raw material storage, cigarette production, and offices. With increasing system complexity, safety risks have evolved from traditional mechanical failures to multi-dimensional hazards affecting production, equipment, quality, and fire safety, giving rise to a comprehensive and systematic demand for safety protection.

[0003] In traditional risk prevention models, safety protection mainly relies on physical isolation and basic electrical protection. Mechanical protection focuses on hardware protection devices such as overload protection for fans and anti-freezing and cracking protection for surface coolers, while electrical systems deal with short circuit and leakage risks through passive protection methods such as circuit breakers and grounding protection. Summary of the Invention

[0004] In view of the above, the present invention aims to provide a safety protection control system and method for an air conditioning system to solve the aforementioned technical problems.

[0005] The technical solution adopted in this invention is as follows:

[0006] This invention provides a safety protection and control system for an air conditioning system, comprising:

[0007] The first and second air ducts are interconnected;

[0008] A return air fan installed in the first air duct;

[0009] A blower installed in the second air duct;

[0010] A controller that is electrically connected to both the return air fan and the supply air fan;

[0011] The second air duct is equipped with multiple steam pipes, and the steam pipes are equipped with steam humidification valves, steam heating valves, and cooling valves;

[0012] A supply air temperature and humidity sensor and a micro-mist humidifier are installed on the second air duct;

[0013] The air supply temperature and humidity sensor, the micro-mist humidifier, the steam humidification valve, the steam heating valve, and the cooling valve are all electrically connected to the controller.

[0014] Optionally, a return air valve is provided on the first air duct, and the return air valve is located on one side of the return air fan.

[0015] Optionally, an air supply valve is provided on the second air duct, and the air supply valve and the micro-mist humidifier are located on both sides of the blower, respectively.

[0016] The air supply temperature and humidity sensor is located between the air supply fan and the air supply valve.

[0017] Optionally, the safety protection and control system of the air conditioning system may also include:

[0018] An exhaust valve installed on the first air duct;

[0019] A fresh air valve installed on the second air duct;

[0020] A mixing valve is installed at the connection point between the first air duct and the second air duct.

[0021] The present invention also provides a safety protection control method for an air conditioning system, comprising:

[0022] Condensate prevention and control methods, safe shutdown control methods, equipment fault linkage protection control methods, and steam pipeline liquid hammer protection control methods;

[0023] The condensate prevention and control methods include:

[0024] The controller collects the dew point and humidity data of the supply air in the second air duct in real time. When it detects that the supply air has reached the condensate area, it continuously cascades the steam humidification valve based on the deviation of the condensate level.

[0025] The safe shutdown control method includes: when the shutdown command is triggered, the controller controls the closure of the steam humidification valve, steam heating valve, cooling valve and micro-mist humidifier, and shuts down the blower and return air blower after maintaining operation for a preset time;

[0026] The equipment fault linkage protection control method includes: when the blower or return air blower fails during operation, the controller controls the steam heating valve, steam humidification valve, refrigeration valve and micro-mist humidifier to all be shut down;

[0027] The steam pipeline liquid hammer protection control method includes: monitoring the temperature of the steam pipeline through a steam temperature sensor, and after detecting that the condensate has been drained, controlling the controller to open the steam heating valve and the steam humidification valve.

[0028] Optionally, the cascade adjustment includes:

[0029] The initial humidification amount is output based on the deviation between the supply air dew point data and the target dew point data;

[0030] The opening of the steam humidifier valve is dynamically adjusted based on the deviation between the initial humidification amount and the actual opening of the steam humidifier valve.

[0031] Optionally, the safe shutdown control method further includes:

[0032] When the supply air temperature exceeds the preset protection value, the opening of the steam heating valve is reduced to maintain the maximum allowable supply air temperature.

[0033] Optionally, the safety protection and control methods for air conditioning systems may also include fire-fighting linkage mechanisms.

[0034] The fire alarm linkage mechanism includes, upon receiving a fire alarm signal, the controller stops both the supply air fan and the return air fan, and closes the supply air valve, return air valve, fresh air valve, and exhaust air valve.

[0035] The above-described solution of the present invention has at least the following beneficial effects:

[0036] The above-described solution of the present invention includes a system comprising: a first air duct and a second air duct that are interconnected; a return air fan installed in the first air duct; a supply air fan installed in the second air duct; a controller electrically connected to both the return air fan and the supply air fan; multiple steam pipes installed on the second air duct, each equipped with a steam humidification valve, a steam heating valve, and a cooling valve; and a supply air temperature and humidity sensor and a micro-mist humidifier installed on the second air duct; the supply air temperature and humidity sensor, the micro-mist humidifier, the steam humidification valve, the steam heating valve, and the cooling valve are all electrically connected to the controller. The method includes: a condensate prevention control method, a safe shutdown control method, an equipment fault linkage protection control method, and a steam pipe liquid hammer protection control method. This solution utilizes sensors, sensor identification programs, and computational programs to judge and identify hidden risks existing in system operation, and formulates corresponding safety protection strategies to systematically control the stable operation of the air conditioning unit. An automatic sensor identification rule base and a sensor failure judgment rule base have been established to automatically identify possible sensor fault alarms, which is of great significance for the constant temperature and humidity control of the air conditioning system. This safety protection and control method not only effectively reduces the probability of dangerous accidents, but also ensures the personal safety of relevant personnel and the equipment safety of air conditioning units. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is a schematic diagram of the safety protection and control system of an air conditioning system provided in an embodiment of the present invention. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] This invention proposes an embodiment of a safety protection and control system for an air conditioning system, specifically, as follows: Figure 1 As shown, it includes:

[0041] The interconnected first air duct 21 and second air duct 22 form the circulating air duct of the air conditioning system;

[0042] The first air duct 21 is equipped with a return air fan 2, a supply air temperature and humidity sensor 5, and a micro-mist humidifier 7. A return air valve 3 is installed on one side of the return air fan 2, and a return air temperature and humidity sensor 1 is installed on the other side of the return air fan 2.

[0043] A blower 6 is installed inside the second air duct 22. An air supply valve 4 is installed on the side of the blower 6. The air supply valve 4 and the micro-mist humidifier 7 are located on both sides of the blower 6. The air supply temperature and humidity sensor 5 is located between the blower 6 and the air supply valve 4.

[0044] Both the return air fan 2 and the supply air fan 6 are electrically connected to the controller 20. The controller 20 is electrically connected to the return air fan 2 and the supply air fan 6 through the fan control cabinet 19. The controller 20 is also connected to the host system 24.

[0045] The second air duct 22 is equipped with multiple steam pipes 10, and steam humidification valve 8, steam heating valve 9, and cooling valve 11 are connected in parallel on the steam pipes 10;

[0046] The air supply temperature and humidity sensor 5, the micro-mist humidifier 7, the steam humidification valve 8, the steam heating valve 9, and the cooling valve 11 are all electrically connected to the controller 20.

[0047] An exhaust valve 18 is installed on the first air duct 21, and a fresh air valve 16 is installed on the second air duct 22. A mixing valve 17 is installed at the connection between the first air duct 21 and the second air duct 22. A fresh air temperature and humidity sensor 15, a mixing air temperature and humidity sensor 14, a pre-filter 13, and a medium-efficiency filter 12 are also installed in sequence on the second air duct 22 near the connection between the first air duct 21 and the second air duct 22.

[0048] This invention also provides a safety protection control method for an air conditioning system, comprising:

[0049] Condensate prevention and control methods, safe shutdown control methods, equipment fault linkage protection control methods, and steam pipeline liquid hammer protection control methods;

[0050] The safety protection and control method of the air conditioning system in this embodiment is automatically controlled by the controller 20. The controller 20 collects the monitoring data of each sensor, judges the operating status of the air conditioning system based on the monitoring data, and adjusts each component of the air conditioning system. The controller 20 adopts a PLC.

[0051] The methods for preventing and controlling condensate include:

[0052] The controller 20 collects the dew point data and humidity data of the supply air in the second air duct 22 in real time. When it detects that the supply air is close to the condensate area, it continuously cascades the steam humidification valve 8 based on the condensate degree deviation.

[0053] Specifically, based on the supply air dew point calculation and the supply air humidity change trend, the controller 20 automatically determines the degree of approaching condensation based on the humidity parameters measured by the supply air temperature and humidity sensor 5, and uses the return air temperature and humidity sensor 1, the mixing valve 17, and the corresponding dew point temperature. When the supply air approaches the condensation area, the controller 20 begins to calculate the condensation deviation, and then performs cascade adjustment of the steam humidification valve 8 based on this deviation to ensure that the humidification capacity of the steam humidification valve 8 is maximized without producing condensation. This continuous cascade adjustment control strategy is significantly more effective than simply limiting the humidification amount to prevent condensation, achieving maximum humidification while preventing condensation accidents.

[0054] Cascade regulation includes:

[0055] First, the initial humidification amount is output based on the deviation between the supply air dew point data and the target dew point data;

[0056] The controller 20 converts the temperature T and relative humidity RH measured in real time by the supply air temperature and humidity sensor 5 into the current supply air dew point temperature. Compared with the preset safe dew point target value By comparison, the main deviation signal is obtained:

[0057] ;

[0058] main deviation signal The input is fed into the main PID controller, and after proportional-integral-derivative operations, the theoretical humidification amount Q is output.

[0059] Furthermore, the opening of the steam humidification valve 8 is dynamically adjusted based on the deviation between the initial humidification amount and the actual opening of the steam humidification valve 8.

[0060] Controller 20 acquires the theoretical humidification capacity Q and the valve opening feedback signal of steam humidification valve 8. The controller 20 converts the theoretical humidification amount Q into the corresponding theoretical valve opening through a linear mapping. Calculate the secondary deviation signal:

[0061] ;

[0062] The input PID controller outputs a current signal (4-20mA) to drive the electric actuator of the steam humidification valve 8, dynamically adjusting the valve opening.

[0063] The safe shutdown control method includes: when the shutdown command is triggered, the controller 20 controls the closure of the steam humidification valve 8, the steam heating valve 9, the cooling valve 11 and the micro-mist humidifier 7, and shuts down the blower 6 and the return air fan 2 after maintaining operation for a preset time;

[0064] Specifically, for equipment safety reasons, the air conditioning system will only control the cooling and humidification according to the temperature and humidity after the air conditioner's blower 6 is running. Conversely, when the air conditioner is scheduled to stop, the controller 20 will first turn off the steam humidification valve 8, the steam heating valve 9, the cooling valve 11, and the micro-mist humidifier 7, and then keep the blower 6 and the return air fan 2 running for 3-5 minutes before stopping, in order to dry the moisture in the air duct and cool it down.

[0065] When the supply air temperature exceeds the preset protection setting, the controller 20 will automatically start to suppress the steam heating valve 9 to ensure that the temperature value of the supply air temperature and humidity sensor 5 does not continue to rise, and will eventually be maintained at the maximum allowable supply air temperature, thereby achieving the purpose of both maximizing heating and protecting the supply fan 6. When the air conditioning supply fan 6 and return air fan 2 unexpectedly stop, the system will immediately and automatically close the steam heating valve 9 and the steam humidification valve 8 to protect the air conditioning unit.

[0066] Among them, the equipment fault linkage protection control method includes: when the blower 6 or the return blower 2 fails during operation, the controller 20 controls the steam heating valve 9, the steam humidification valve 8, the refrigeration valve 11 and the micro-mist humidifier 7 to all close.

[0067] Specifically, when the air conditioner stops, the steam heating valve 9, the steam humidification valve 8, and the cooling valve 11 are linked. If the supply fan 6 and the return fan 2 malfunction during operation, the steam heating valve 9, the steam humidification valve 8, the cooling valve 11, and the micro-mist humidifier 7 will automatically shut down in an emergency to prevent a large amount of steam and water vapor from entering the air conditioning unit.

[0068] The steam pipeline liquid hammer protection control method includes: monitoring the temperature of the steam pipeline 10 through the steam temperature sensor 23, and after detecting that the condensate has been drained, the controller 20 controls the opening of the steam heating valve 9 and the steam humidification valve 8.

[0069] Specifically, the air conditioning system uses steam heaters and humidifiers. Due to the liquid slugging effect of steam pipe 10, the heating coils are damaged prematurely. After the air conditioning unit has been shut down for a long time, a large amount of residual steam in steam pipe 10 has already condensed into condensate and filled the pipe. In the initial stage of humidification, the condensate drainage system is unable to completely drain the water, and the condensate in steam pipe 10 will also be sprayed into the heating coils inside the unit, causing damage and leakage to the heating coils, affecting the normal operation of the air conditioning system. To address the above situation, a steam temperature sensor 23 is used to force condensation based on the detection of steam temperature. Only after the condensate in steam pipe 10 is completely drained will the steam heating valve 9 and the steam humidification valve 8 be opened for automatic adjustment, thereby effectively avoiding liquid slugging.

[0070] The safety protection and control methods for air conditioning systems also include a fire alarm linkage mechanism: Upon receiving a fire alarm signal, the controller 20 stops both the supply air fan 6 and the return air fan 2, and closes the supply air valve 4, return air valve 3, fresh air valve 16, and exhaust air valve 18.

[0071] Specifically, the safety protection strategy of the air conditioning system also takes into account the linkage with the fire protection system. After receiving the fire alarm signal from the control room of the fire protection center, the air conditioning system can automatically and quickly act according to the pre-set strategy. In the event of a sudden fire, it will immediately stop the supply fan 6 and return fan 2, close the supply air valve 4, return air valve 3, fresh air valve 16 and exhaust air valve 18, cut off the oxygen supply, and ensure the safe operation of the air conditioning system.

[0072] The air conditioning system can switch between manual and automatic modes. Electric control actuators such as the steam heating valve 9, cooling valve 11, steam humidification valve 8, fresh air valve 16, return air valve 3, and micro-mist humidifier 7 are normally in automatic control mode. For safety reasons, these control devices have been equipped with remote or local manual control modes. When operators discover unexpected situations, they can quickly switch from automatic control to manual intervention mode, where control is then transferred from automatic to manual. For example, after switching to manual control mode, the electric regulating valves and electric air valves no longer automatically link with the ambient temperature and humidity; the operator issues commands on the touchscreen or workstation. After manual intervention, the operator switches back to automatic mode, returning control to the controller 20. The combination of automatic control and manual intervention modes effectively improves the safety of the air conditioning system and prevents accidents.

[0073] Air conditioning systems employ numerous sensors distributed over long distances, and the accuracy of their data is crucial for maintaining constant temperature and humidity. Incorrect connections between sensors and input ports can cause system malfunctions. To address this, an automatic sensor identification strategy uses a sensor identification rule base and a sensor failure judgment rule base to automatically identify potential sensor faults and trigger alarms. Once the controller 20 is operating normally, it continuously monitors the data collected by each sensor online. If the sensor data deviates from its range, it is considered an absolute failure, and an alarm signal is displayed on the sensor information display unit. If the sensor data is within its range but deviates from the normal range, it is considered a relative failure, and a hold signal is provided. After a fixed period, if the sensor data, although within its range, still deviates from the normal range, a connection error is identified, and the sensor information display unit provides a connection error alarm signal. This allows for remote, real-time monitoring of the air conditioning system's operating status.

[0074] The air conditioning system uses a weighted average calculation strategy to obtain the average temperature, humidity, dew point temperature, and enthalpy of the entire air conditioning control area, which serves as the basis for the control system in the next step.

[0075] The highly reliable fresh air temperature and humidity sensor 15 and the corresponding dew point temperature and enthalpy value calculation serve as the control basis for the next step of fresh air energy-saving operation zone control.

[0076] The reliable supply air temperature and humidity sensor 5, return air temperature and humidity sensor 1, and mixing air sensor 17 are used to detect and calculate the corresponding dew point temperature and enthalpy value, which serves as one of the control bases for the next step of cascade regulation PID control.

[0077] The system monitors the operating status, current, and protection faults of the supply fan 6 and return fan 2, and accumulates the fan operating time. When a certain time is reached, the system reminds the user to perform necessary maintenance.

[0078] The system detects the opening degree of electrically adjustable valves such as steam heating valve 9, cooling valve 11, and steam humidification valve 8 to provide early warning of abnormal valve conditions.

[0079] Highly reliable electric regulating valves are the most important actuators in constant temperature and humidity air conditioning systems. The system relies on them to continuously open and close to regulate cooling and heating. Because they operate in harsh environments for extended periods, they are prone to failure. Electric valves are often installed in locations difficult for maintenance personnel to access or observe, which is detrimental to their ability to monitor their operation. If the valve's set opening degree differs significantly from the feedback opening degree, the system will issue a warning message to alert the user that the valve may be stuck, thus ensuring the stable operation of the air conditioning system.

[0080] This invention utilizes sensors, sensor identification programs, and computational programs to identify and assess hidden risks during system operation, and formulates corresponding safety protection strategies to systematically control the stable operation of the air conditioning unit. An automatic sensor identification rule base and a sensor failure judgment rule base have been established to automatically identify potential sensor fault alarms, which is of great significance for the constant temperature and humidity control of the air conditioning system. This safety protection control strategy not only effectively reduces the probability of dangerous accidents but also ensures the personal safety of relevant personnel and the equipment safety of the air conditioning unit.

[0081] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0082] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0083] In the embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0084] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0085] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0086] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0087] Furthermore, it should be noted that in the apparatus and method of the present invention, it is obvious that the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered equivalent solutions of the present invention. Moreover, the steps performing the above series of processes can naturally be executed in the order described, but are not necessarily required to be executed in chronological order; some steps can be executed in parallel or independently of each other. Those skilled in the art will understand that all or any step or component of the method and apparatus of the present invention can be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or a combination thereof. This is something that those skilled in the art can achieve by using their basic programming skills after reading the description of the present invention.

[0088] Therefore, the object of the present invention can also be achieved by running a program or a set of programs on any computing device. The computing device can be a known general-purpose device. Therefore, the object of the present invention can also be achieved simply by providing a program product containing program code implementing the method or apparatus. That is, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any known storage medium or any storage medium developed in the future. It should also be noted that in the apparatus and method of the present invention, it is obvious that the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered equivalent to the present invention. Furthermore, the steps performing the above series of processes can naturally be performed in the order described, but are not necessarily required to be performed in chronological order. Some steps can be performed in parallel or independently of each other.

[0089] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A safety protection and control system for an air conditioning system, characterized in that, include: The first air duct (21) and the second air duct (22) are interconnected; A return air fan (2) is installed in the first air duct (21); A blower (6) is installed in the second air duct (22); A controller (20) is electrically connected to both the return air fan (2) and the supply air fan (6); The second air duct (22) is provided with multiple steam pipes (10), and the steam pipes (10) are provided with steam humidification valve (8), steam heating valve (9), and refrigeration valve (11); A supply air temperature and humidity sensor (5) and a micro-mist humidifier (7) are installed on the second air duct (22); The air supply temperature and humidity sensor (5), the micro-mist humidifier (7), the steam humidification valve (8), the steam heating valve (9), and the refrigeration valve (11) are all electrically connected to the controller (20).

2. The safety protection and control system for the air conditioning system according to claim 1, characterized in that, A return air valve (3) is provided on the first air duct (21), and the return air valve (3) is located on one side of the return air fan (2).

3. The safety protection and control system for the air conditioning system according to claim 1, characterized in that, An air supply valve (4) is provided on the second air duct (22), and the air supply valve (4) and the micro-mist humidifier (7) are located on both sides of the blower (6); The air supply temperature and humidity sensor (5) is located between the air supply fan (6) and the air supply valve (4).

4. The safety protection and control system for the air conditioning system according to claim 1, characterized in that, Also includes: An exhaust valve (18) is installed on the first air duct (21); A fresh air valve (16) is installed on the second air duct (22); A mixing valve (17) is provided at the connection point between the first air duct (21) and the second air duct (22).

5. A safety protection and control method for an air conditioning system, characterized in that, A safety protection control system applied to an air conditioning system as described in any one of claims 1 to 4, comprising: Condensate prevention and control methods, safe shutdown control methods, equipment fault linkage protection control methods, and steam pipeline liquid hammer protection control methods; The condensate prevention and control methods include: The controller (20) collects the dew point data and humidity data of the air supply in the second air duct (22) in real time. When it detects that the air supply reaches the condensate area, it continuously cascades the steam humidification valve (8) based on the condensate degree deviation. The safe shutdown control method includes: when the shutdown command is triggered, the controller (20) controls the closure of the steam humidification valve (8), the steam heating valve (9), the refrigeration valve (11) and the micro-mist humidifier (7), and maintains the operation of the blower (6) and the return air fan (2) for a preset time before shutting down; The equipment fault linkage protection control method includes: when the blower (6) or return blower (2) fails during operation, the controller (20) controls the steam heating valve (9), steam humidification valve (8), refrigeration valve (11) and micro-mist humidifier (7) to all close; The steam pipeline liquid hammer protection control method includes: monitoring the temperature of the steam pipeline (10) by a steam temperature sensor (23), and after detecting that the condensate has been drained, the controller (20) controls the opening of the steam heating valve (9) and the steam humidification valve (8).

6. The safety protection and control method for the air conditioning system according to claim 5, characterized in that, The cascade regulation includes: The initial humidification amount is output based on the deviation between the supply air dew point data and the target dew point data; The opening of the steam humidification valve (8) is dynamically adjusted based on the deviation between the initial humidification amount and the actual opening of the steam humidification valve (8).

7. The safety protection and control method for an air conditioning system according to claim 5, characterized in that, The safe shutdown control method further includes: When the supply air temperature exceeds the preset protection value, reduce the opening of the steam heating valve (9) to maintain the maximum allowable supply air temperature.

8. The safety protection and control method for an air conditioning system according to claim 5, characterized in that, It also includes fire-fighting linkage mechanisms and methods; The fire linkage mechanism method includes receiving a fire alarm signal, and then the controller (20) controls the supply fan (6) and return fan (2) to stop, and controls the supply air valve (4), return air valve (3), fresh air valve (16) and exhaust air valve (18) to close.

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