Rto heat fresh air waste heat recovery recycling energy saving control method and device thereof

Abstract

The application provides an RTO heat fresh air waste heat recovery recycling energy-saving control method and device, a control system controls the opening degree proportion of a cold water electric valve, a hot water electric valve and a humidification pipe valve according to a temperature difference value and a humidity difference value, and constant temperature and humidity control of an environmentally-friendly workshop is realized; if the indoor and outdoor temperature difference value is greater than a first threshold value, an RTO heat fresh air system is started and an outdoor fresh air system is closed in an RTO heat fresh air state; if the RTO heat fresh air system is disabled for some reason, the outdoor fresh air system is started and the RTO heat fresh air system is closed in an outdoor fresh air state; in the RTO heat fresh air state or the outdoor fresh air state, the control system controls the opening degree proportion of the valve according to the re-measured temperature difference value and humidity difference value, so as to realize constant temperature and humidity control of the environmentally-friendly workshop; if the indoor and outdoor pressure difference is a positive number and / or a preset exhaust condition is reached, the control system controls the exhaust system to be opened. The application can more efficiently realize constant temperature and humidity control of a production workshop and achieve the energy-saving purpose by using RTO heat fresh air.

Description

Technical Field

[0001] This application belongs to the field of environmental protection and energy-saving device technology, and more specifically, it relates to an energy-saving control method and device for the recovery and recycling of waste heat from RTO hot fresh air. Background Technology

[0002] When considering temperature and humidity ranges in a workshop, heating is usually provided by hot water or electric heating to supply heat to the equipment, which is then delivered to the workshop through air ducts to raise the workshop temperature to the required heating temperature. However, both hot water and electric heating consume a lot of energy. At the same time, the production equipment also generates a lot of hot exhaust air during the production process, resulting in energy waste. Summary of the Invention

[0003] The purpose of this application is to provide an energy-saving control method for the recovery and recycling of waste heat from RTO fresh air, so as to solve the above-mentioned technical problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: An energy-saving control method for the recovery and recycling of waste heat from an RTO (Refresh Air Toll Collection) system is provided for environmental control in an environmental protection workshop. This method is based on an RTO waste heat recovery and recycling energy-saving device, which includes an AHU (Air Hull Unit) air conditioning system, an outdoor fresh air system, an exhaust system, and a control system. The RTO waste heat recovery and recycling energy-saving control method includes the following steps:

[0005] The system acquires the actual return air temperature and humidity data in the air conditioning return air duct of the AHU air conditioning system. The difference between the actual return air temperature data and the preset standard return air temperature data is the temperature difference, and the difference between the actual return air humidity data and the preset standard return air humidity data is the humidity difference. The control system controls the opening ratio of the cold water electric valve, the hot water electric valve, and the valve on the humidification pipe according to the temperature difference and humidity difference to achieve constant temperature and humidity control in the environmental protection workshop.

[0006] The system acquires outdoor temperature data from the environmental protection workshop. The difference between the outdoor temperature data and the actual return air temperature data is the indoor-outdoor temperature difference. If the indoor-outdoor temperature difference exceeds a set first threshold, the control system activates the RTO (Regenerative Thermal Oxidizer) hot air waste heat recovery and recycling energy-saving device to enter RTO hot air state. The RTO hot air system starts up, and the outdoor fresh air system is shut down. The RTO hot air provided by the RTO hot air system is delivered to the environmental protection workshop through the air conditioning supply duct. If the RTO hot air system is shut down for any reason, the control system activates the RTO hot air waste heat recovery and recycling energy-saving device to enter outdoor fresh air state. The outdoor fresh air system starts up, and the RTO hot air system is shut down. In both RTO hot air and outdoor fresh air states, the control system adjusts the opening ratios of the cold water electric valve, hot water electric valve, and valves on the humidification pipe according to the remeasured temperature and humidity differences to achieve constant temperature and humidity control in the environmental protection workshop.

[0007] The system acquires indoor air pressure data inside the environmental protection workshop and outdoor air pressure data outside the environmental protection workshop. The difference between the indoor and outdoor air pressure data is the indoor-outdoor pressure difference. If the indoor-outdoor pressure difference is positive and / or reaches the preset exhaust conditions, the control system controls the exhaust system to start until the indoor-outdoor pressure difference is negative and does not exceed the preset exhaust conditions.

[0008] Optionally, the control system controls the opening ratios of the cold water electric valve, the hot water electric valve, and the valves on the humidification pipe based on the temperature and humidity differences to achieve constant temperature and humidity control in the environmentally friendly workshop. This process includes the following steps:

[0009] When the temperature difference is positive, the control system calculates the cooling demand based on the temperature difference and increases or decreases the opening ratio of the cold water electric valve and / or decreases the opening ratio of the hot water electric valve according to the cooling demand.

[0010] When the temperature difference is negative, the control system calculates the heating demand based on the temperature difference and increases the opening ratio of the hot water electric valve and / or decreases the opening ratio of the cold water electric valve according to the heating demand.

[0011] When the humidity difference is positive, the control system calculates the dehumidification demand based on the humidity difference and reduces the opening ratio of the valve on the humidification pipe according to the dehumidification demand.

[0012] When the humidity difference is negative, the control system calculates the humidification demand based on the humidity difference and increases the opening ratio of the valve on the humidification pipe according to the humidification demand.

[0013] Optionally, in the RTO hot fresh air state, after the RTO hot fresh air system is started, the following steps are also included:

[0014] After the RTO hot fresh air system starts for a preset period of time, the actual return air temperature data is reacquired, and the control system recalculates the temperature difference based on the actual return air temperature data and the standard return air temperature data.

[0015] When the temperature difference is positive, the control system reduces the opening ratio of the electric valve on the hot air duct of the RTO hot air system.

[0016] When the temperature difference is negative, the control system increases the opening ratio of the hot fresh air electric valve.

[0017] Optionally, the energy-saving control method for RTO hot fresh air waste heat recovery and recycling also includes an air volume control method for the AHU air conditioning system, which includes the following steps:

[0018] AHU air conditioning system blower inverter start;

[0019] Obtain air volume data from the main air supply duct of the AHU air conditioning system;

[0020] The control system automatically adjusts the operating frequency of the blower based on the air volume data.

[0021] Optionally, the environmentally friendly workshop includes a production workshop and a static pressure layer above the ceiling above the production workshop. The exhaust system includes workshop exhaust fans located in the production workshop and static pressure layer exhaust fans located in the static pressure layer above the ceiling. The control system controls the opening of the exhaust system in the following steps:

[0022] The control system acquires the indoor and outdoor pressure difference, the temperature data of the static pressure layer above the ceiling, and the opening degree of the cold water electric valve. Based on the temperature data of the static pressure layer above the ceiling and the opening degree of the cold water electric valve, it determines whether the preset exhaust conditions have been met.

[0023] If the indoor-outdoor pressure difference is positive and / or the preset exhaust conditions are met, both the workshop exhaust fan and the static pressure layer exhaust fan will start with frequency conversion.

[0024] The preset exhaust conditions are that the temperature data of the static pressure layer at the top of the ceiling is greater than 28°C within 10 consecutive minutes, and the cold water electric valve is in the fully open state.

[0025] Optionally, both the workshop exhaust fan and the static pressure layer exhaust fan gradually increase their frequency from 35Hz to 50Hz within a preset time.

[0026] Optionally, a make-up air pressure relief valve is installed on the wall where the static pressure layer above the ceiling intersects with the outside, and the make-up air pressure relief valve is connected to the control system.

[0027] This application also proposes an RTO (Regenerative Thermal Oxidizer) hot fresh air waste heat recovery and recycling energy-saving device, characterized in that it is used in an environmentally friendly workshop, the environmentally friendly workshop including a floor, top walls, surrounding walls, and a ceiling, the top walls, ceiling, and surrounding walls forming an upper static pressure layer, the ceiling, floor, and surrounding walls forming the environmentally friendly workshop, characterized in that the RTO hot fresh air waste heat recovery and recycling energy-saving device includes:

[0028] The AHU air conditioning system includes an air handling unit, an air return duct, an air supply duct, chilled water pipes, hot water pipes, humidification pipes, and several diffusers; the air handling unit includes a first air inlet, a second air inlet, a return air inlet, and an air outlet; one end of the air return duct extends from the static pressure layer above the ceiling into the environmental protection workshop, and the other end of the air return duct is connected to the return air inlet; one end of the air supply duct is located in the static pressure layer above the ceiling and is connected to a diffuser installed on the ceiling, and the other end of the air supply duct is connected to the air outlet;

[0029] RTO hot fresh air system includes a hot fresh air duct connected to the first air inlet and a hot fresh air electric valve installed on the hot fresh air duct.

[0030] An outdoor fresh air system includes an outdoor fresh air duct connected to a second air inlet and an outdoor fresh air electric valve installed on the outdoor fresh air duct.

[0031] The exhaust system includes exhaust ducts, indoor exhaust equipment and outdoor exhaust equipment; indoor exhaust equipment is installed in the static pressure layer above the ceiling and on the ceiling, and at least some of the indoor exhaust equipment is connected to the outdoor exhaust equipment through exhaust ducts;

[0032] The control system is connected to the AHU air conditioning system, RTO hot and fresh air system, outdoor fresh air system and exhaust system respectively;

[0033] The RTO hot fresh air waste heat recovery and recycling energy-saving device includes RTO hot fresh air mode and outdoor fresh air mode. In RTO hot fresh air mode, the RTO hot fresh air system is turned on and the outdoor fresh air system is turned off. In outdoor fresh air mode, the RTO hot fresh air system is turned off and the outdoor fresh air system is turned on. In either RTO hot fresh air mode or outdoor fresh air mode, the AHU air conditioning system is used to control the environmental protection workshop to be in a constant temperature and humidity state, and the exhaust system is used to control the static pressure layer above the ceiling and the environmental protection workshop to be in a slightly negative pressure state.

[0034] Optionally, the RTO hot fresh air system also includes RTO equipment and a hot fresh air manual valve; the hot fresh air generated by the RTO equipment enters the air conditioning unit through the hot fresh air duct and the first air inlet; the hot fresh air manual valve is located on the hot fresh air duct and between the hot fresh air electric valve and the first air inlet.

[0035] The outdoor fresh air system also includes a rainproof louvered fresh air fan and a manual fresh air valve; the rainproof fresh air fan is located at the end of the outdoor fresh air duct away from the air conditioning unit, and the manual fresh air valve is located on the outdoor fresh air duct, between the rainproof fresh air fan and the electric fresh air valve; a first pressure probe is also installed in the static pressure layer at the top of the ceiling; both the electric fresh air valve and the first pressure probe are connected to the control system.

[0036] Optionally, the indoor exhaust ventilation equipment includes a first exhaust louver, a second exhaust louver, and a workshop exhaust fan. Both the first exhaust louver and the workshop exhaust fan are located in the static pressure layer above the ceiling, and the workshop exhaust fan is located below the first exhaust louver. The second exhaust louver is installed on the ceiling and is connected to the workshop exhaust fan.

[0037] The outdoor ventilation equipment includes a static pressure layer exhaust fan, one end of the exhaust pipe extending out of the environmental protection workshop is connected to the static pressure layer exhaust fan, and the other end of the exhaust pipe located in the static pressure layer above the ceiling is connected to the first exhaust louver; the exhaust pipe is equipped with an exhaust electric valve and an exhaust manual valve, and the exhaust manual valve is located between the exhaust electric valve and the static pressure layer exhaust fan.

[0038] A first temperature probe is also installed in the static pressure layer at the top of the ceiling. Both the exhaust fan of the static pressure layer and the first temperature probe are connected to the control system.

[0039] The beneficial effects of the RTO hot fresh air waste heat recovery and recycling energy-saving control method provided in this application are as follows: First, after the AHU air conditioning system is turned on, the actual return air temperature and humidity data on the air conditioning return air duct will be monitored by relevant temperature and humidity sensors. The control system can calculate the temperature difference and humidity difference based on the monitored return air temperature and humidity conditions and compare them with the preset standard temperature and humidity conditions. Then, it can calculate the demand for cooling, heating, dehumidification or humidification. Then, by controlling the opening ratio of the cold water electric valve, the hot water electric valve and the valve on the humidification pipe, the input of cold water and hot water can be controlled, thereby achieving constant temperature and humidity control in the environmental protection workshop. Then, when the heat generated inside the environmental protection workshop is high while the outdoor temperature is low (i.e., the temperature difference between indoors and outdoors exceeds the set first threshold), the control system will activate the RTO (Regenerative Thermal Oxidizer) hot air system and shut down the outdoor fresh air system. In this RTO hot air mode, the clean, high-temperature hot air generated by the RTO equipment is connected to the heating section of the air conditioning unit and mixed with the indoor circulating air before being delivered to the production workshop, thus achieving energy savings. Simultaneously, the control system will automatically adjust the ratio of cold and hot water input based on the remeasured temperature and humidity to ensure the production workshop maintains a suitable constant temperature and humidity. In certain special circumstances, such as when the RTO hot air system needs to be shut down for maintenance, this RTO hot air waste heat recovery and recycling energy-saving device will switch to outdoor fresh air mode. The backup outdoor fresh air system will be activated under control, and the RTO hot air system will be shut down. At the same time, the control system will automatically adjust the ratio of cold and hot water input based on the outdoor operating conditions and the remeasured temperature and humidity to ensure that the indoor operating conditions are not affected even when the RTO hot air system is not in use. Then, when the temperature inside the environmental protection workshop is high and / or the indoor pressure is positive (i.e., the pressure difference between indoors and outdoors is positive and / or the preset exhaust conditions are met), the control system will activate the exhaust system based on relevant monitoring data. This ensures that the temperature inside the production workshop meets the requirements and that both the static pressure layer above the ceiling and the production workshop are under a slight negative pressure state. In summary, this RTO hot fresh air waste heat recovery and recycling energy-saving control method and device enable the environmental protection workshop to achieve environmental protection and energy-saving effects under constant temperature, constant humidity, and slight negative pressure conditions by utilizing the automatic regulation of the RTO hot fresh air from the RTO hot fresh air system. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1A flowchart of the energy-saving control method for RTO hot fresh air waste heat recovery and recycling provided in the embodiments of this application;

[0042] Figure 2 This is a schematic diagram of the structure of the RTO hot fresh air waste heat recovery and recycling energy-saving device provided in the embodiments of this application;

[0043] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0044] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0045] Figure 5 for Figure 2 Enlarged view of point C in the middle;

[0046] Figure 6 for Figure 2 Enlarged view of point D in the middle;

[0047] Figure 7 for Figure 2 Enlarged view of point E in the middle;

[0048] Figure 8 for Figure 2 Enlarged schematic diagram at point F in the middle.

[0049] Explanation of icon numbers:

[0050]

[0051]

[0052] Detailed Implementation

[0053] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0054] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0055] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this application are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0056] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] The embodiments of this application 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 intended to explain this application, and should not be construed as limiting this application.

[0060] This application provides an energy-saving control method and apparatus for the recovery and recycling of waste heat from RTO (Regenerative Thermal Oxidizer) fresh air.

[0061] Please see Figure 1 In one embodiment, the energy-saving control method for recovering and recycling waste heat from RTO (Regenerative Thermal Oxidizer) fresh air is based on an RTO fresh air waste heat recovery and recycling energy-saving device and is used for environmental control in an environmental protection workshop. The RTO fresh air waste heat recovery and recycling energy-saving control method includes the following steps:

[0062] S1. Obtain the actual return air temperature and humidity data in the air conditioning return air duct 220 of the AHU (Air Handling Unit) air conditioning system. The difference between the actual return air temperature data and the preset standard return air temperature data is the temperature difference value, and the difference between the actual return air humidity data and the preset standard return air humidity data is the humidity difference value. The control system 600 controls the opening ratio of the cold water electric valve 245, the hot water electric valve 253, and the valves on the humidification pipe 260 according to the temperature difference value and the humidity difference value, so as to achieve constant temperature and humidity control in the environmental protection workshop.

[0063] S2. Obtain the outdoor temperature data of the environmental protection workshop. The difference between the outdoor temperature data and the actual return air temperature data is the indoor-outdoor temperature difference. If the indoor-outdoor temperature difference is greater than the set first threshold, the control system 600 controls the RTO hot fresh air waste heat recovery and recycling energy-saving device to enter the RTO hot fresh air state. The RTO hot fresh air system starts and the outdoor fresh air system is closed. The RTO hot fresh air provided by the RTO hot fresh air system is delivered to the environmental protection workshop through the air conditioning supply pipe 230. If the RTO hot fresh air system is shut down for any reason, the control system 600 controls the RTO hot fresh air waste heat recovery and recycling energy-saving device to enter the outdoor fresh air state. The outdoor fresh air system starts and the RTO hot fresh air system is closed. In either the RTO hot fresh air state or the outdoor fresh air state, the control system 600 adjusts the opening ratio of the cold water electric valve 245, the hot water electric valve 253, and the valves on the humidification pipe 260 according to the remeasured temperature difference and humidity difference to achieve constant temperature and humidity control in the environmental protection workshop.

[0064] S3. Obtain indoor air pressure data inside the environmental protection workshop and outdoor air pressure data outside the environmental protection workshop. The difference between indoor air pressure data and outdoor air pressure data is the indoor-outdoor pressure difference. If the indoor-outdoor pressure difference is positive and / or reaches the preset exhaust conditions, the control system 600 controls the exhaust system to start until the indoor-outdoor pressure difference is negative and does not exceed the preset exhaust conditions.

[0065] It should be noted that the environmentally friendly workshop includes the floor, top walls, surrounding walls, and ceiling 110. The top walls, ceiling 110, and surrounding walls form the upper static pressure layer 120 of the ceiling. The ceiling 110, floor, and surrounding walls form the production workshop 130. The ceiling 110 is preferably a color steel ceiling 110. The control system 600 is specifically a PLC (Programmable Logic Controller) control system 600. Various functional systems, such as the RTO hot air system, AHU air conditioning system, outdoor fresh air system, and exhaust system, transmit information to the control system 600 through wireless and / or wired connections. Then, the control system 600 can automatically control each system based on the corresponding monitoring results. Here, since the air in the air conditioning return air duct 220 is directly drawn from the production workshop 130, the measured actual return air temperature data and actual return air humidity data are basically consistent with the actual temperature and humidity in the production workshop 130. In addition, the first threshold, preset standard return air temperature data, preset standard return air humidity data, and preset exhaust conditions can be set according to actual needs.

[0066] Accordingly, such as Figures 2 to 7As shown, this RTO hot fresh air waste heat recovery and recycling energy-saving device includes an AHU air conditioning system, an RTO hot fresh air system, an outdoor fresh air system, an exhaust system, and a control system 600. The AHU air conditioning system includes an air conditioning unit 210, an air conditioning return air duct 220, an air conditioning supply air duct 230, a chilled water pipe 240, a hot water pipe 250, a humidifier pipe 260, and several diffusers 270. The air conditioning unit 210 includes a first air inlet 211, a second air inlet 212, a return air outlet 213, and an air outlet 214. One end of the air conditioning return air duct 220 extends from the upper static pressure layer 120 of the ceiling into the production workshop 130, and the other end of the air conditioning return air duct 220 is connected to the return air outlet 213. One end of the air conditioning supply air duct 230 is located in the upper static pressure layer 120 of the ceiling and is connected to the diffuser 270 installed on the ceiling 110, and the other end of the air conditioning supply air duct 230 is connected to the air outlet 214. The RTO (Refresh Air Tolerance) system includes a hot fresh air duct 310 connected to the first air inlet 211 and a hot fresh air electric valve 320 installed on the hot fresh air duct 310. The outdoor fresh air system includes an outdoor fresh air duct 410 connected to the second air inlet 212 and an outdoor fresh air electric valve 420 installed on the outdoor fresh air duct 410. The exhaust system includes an exhaust duct 510, indoor exhaust equipment, and outdoor exhaust equipment; indoor exhaust equipment is installed in the static pressure layer 120 above the ceiling and on the ceiling 110, and at least some of the indoor exhaust equipment is connected to the outdoor exhaust equipment through the exhaust duct 510. The control system 600 is connected to the AHU (Air Conditioning Unit) system, the RTO system, the outdoor fresh air system, and the exhaust system. In actual use, the RTO hot fresh air waste heat recovery and recycling energy-saving device includes RTO hot fresh air state and outdoor fresh air state; in RTO hot fresh air state, the RTO hot fresh air system is turned on and the outdoor fresh air system is turned off; in outdoor fresh air state, the RTO hot fresh air system is turned off and the outdoor fresh air system is turned on; in either RTO hot fresh air state or outdoor fresh air state, the AHU air conditioning system is used to control the production workshop 130 to be in a constant temperature and humidity state, and the exhaust system is used to control both the upper static pressure layer 120 and the production workshop 130 to be in a slightly negative pressure state.

[0067] Based on this design, in this embodiment, in the technical solution of this application, firstly, after the AHU air conditioning system is turned on, it will monitor the actual return air temperature data and actual return air humidity data on the air conditioning return air duct 220 through relevant temperature and humidity sensors. The control system 600 can calculate the temperature difference and humidity difference by comparing the monitored return air temperature and humidity with the preset standard temperature and humidity. Then, it can calculate the demand for cooling, heating, dehumidification or humidification. Then, by controlling the opening ratio of the valves on the cold water electric valve 245, the hot water electric valve 253 and the humidification pipe 260, it can realize the input control of cold water and hot water, thereby realizing the constant temperature and humidity control of the environmental protection workshop. Then, when the heat generated inside the environmental protection workshop is large and the outdoor temperature is low, that is, when the temperature difference between indoors and outdoors is greater than the set first threshold, the control system 600 will control the RTO hot fresh air system to turn on and turn off the outdoor fresh air system, that is, it is in RTO hot fresh air state. The clean and high temperature hot fresh air generated by the RTO equipment can be connected to the heating section of the air conditioning air handling unit 210 and mixed with the indoor circulating air before being sent to the production workshop 130, thereby achieving the purpose of energy saving. At the same time, the control system 600 will also automatically adjust the input ratio of cold water and hot water according to the remeasured temperature and humidity to ensure that the production workshop 130 is in a qualified constant temperature and humidity condition. In certain special circumstances, such as when the RTO hot air system needs to be shut down for maintenance, the RTO hot air waste heat recovery and recycling energy-saving device will switch to outdoor fresh air mode. The backup outdoor fresh air system will be activated under control, and the RTO hot air system will be shut down. At the same time, the control system 600 will automatically adjust the ratio of cold water and hot water input based on outdoor operating conditions and remeasured temperature and humidity to ensure that indoor operating conditions are not affected when the RTO hot air system is not in use. Then, when the temperature in the environmental protection workshop is high and / or the indoor pressure is positive (i.e., the pressure difference between indoor and outdoor is positive and / or the preset exhaust conditions are met), the control system 600 will activate the exhaust system based on relevant monitoring data, thereby ensuring that the temperature in the production workshop 130 meets the requirements and that both the upper static pressure layer 120 and the production workshop 130 are in a slightly negative pressure state. In summary, this energy-saving control method and device for the recovery and recycling of waste heat from RTO hot fresh air enables environmentally friendly workshops to achieve environmental protection and energy-saving effects under constant temperature, humidity, and slight negative pressure conditions by utilizing the automatic regulation of RTO hot fresh air from the RTO hot fresh air system.

[0068] Furthermore, in this embodiment, the control system 600 controls the opening ratios of the cold water electric valve 245, the hot water electric valve 253, and the valves on the humidification pipe 260 according to the temperature difference and humidity difference to achieve constant temperature and humidity control in the environmental protection workshop. The steps include the following sub-steps:

[0069] When the temperature difference is positive, the control system 600 calculates the cooling demand based on the temperature difference and increases the opening ratio of the cold water electric valve 245 and / or decreases the opening ratio of the hot water electric valve 253 accordingly. A positive temperature difference means that the actual temperature inside the environmental protection workshop is higher than the standard operating conditions, indicating an overheated state. In this case, by adjusting the opening ratios of the relevant valves, the system can increase the cold water input, decrease the hot water input, or both simultaneously, thereby achieving cooling and ensuring that the temperature inside the environmental protection workshop returns to the standard operating conditions.

[0070] When the temperature difference is negative, the control system 600 calculates the heating demand based on the temperature difference and increases the opening ratio of the hot water electric valve 253 and / or decreases the opening ratio of the cold water electric valve 245 accordingly. Similarly, a negative temperature difference means that the actual temperature in the environmental protection workshop is lower than the standard operating conditions, and the workshop is in a supercooled state. In this case, by adjusting the opening ratio of the relevant valves, the cold water input can be reduced or the hot water input can be increased, or both can be reduced or increased simultaneously, thereby raising the temperature and ensuring that the temperature in the environmental protection workshop can be adjusted back to the standard operating conditions.

[0071] When the humidity difference is positive, the control system 600 calculates the dehumidification demand based on the humidity difference and reduces the opening ratio of the valve on the humidification pipe 260 accordingly. In other words, a positive humidity difference means that the actual humidity in the environmental protection workshop is higher than the standard operating conditions, indicating an over-humidified environment. Adjusting the opening ratio of the relevant valves in this case reduces the humidity, ensuring that the humidity in the environmental protection workshop returns to the standard operating conditions.

[0072] When the humidity difference is negative, the control system 600 calculates the humidification demand based on the humidity difference and increases the opening ratio of the valve on the humidification pipe 260 accordingly. Similarly, a negative humidity difference means that the actual humidity in the environmental protection workshop is lower than the standard operating conditions. In this case, by adjusting the opening ratio of the relevant valves, the humidity can be increased to ensure that the humidity in the environmental protection workshop can be adjusted back to the standard operating conditions.

[0073] To achieve precise temperature and humidity control, the AHU air conditioning system incorporates corresponding components. For details, please refer to [link / reference needed]. Figure 2 and Figure 8In this embodiment, the hot water pipe 250 includes a hot water inlet pipe 251 and a hot water outlet pipe 252, both connected to the air conditioning unit 210. The cold water pipe 240 includes a cold water inlet pipe 241 and a cold water outlet pipe 242, both connected to the air conditioning unit 210. The cold water inlet pipe 241 is equipped with a turbine manual butterfly valve 243 and a Y-type filter 244. The cold water outlet pipe 242 is equipped with a turbine manual butterfly valve 243 and a cold water electric valve 245. The cold water electric valve 245 is connected to the control system 600. The hot water inlet pipe 251 is equipped with a turbine manual butterfly valve 243 and a Y-type filter 244. The hot water outlet pipe 252 is equipped with a turbine manual butterfly valve 243 and a hot water electric valve 253. The hot water electric valve 253 is connected to the control system 600. Thus, the control system 600 can increase or decrease the opening ratio of the cold water electric valve 245 and the hot water electric valve 253 according to the heating and cooling demand, thereby achieving control over the input of cold and hot water. A humidifying electric valve 261 is installed on the humidifying pipe 260. The humidifying electric valve 261 is connected to the control system 600, allowing the control system 600 to automatically regulate humidity by controlling the ratio of the humidifying electric valve 261 according to the calculated dehumidification and humidification demand. The turbine manual butterfly valves 243 installed on both the cold water inlet pipe 241 and the hot water inlet pipe 251 mainly function to regulate flow and control opening and closing, offering advantages such as mechanical labor saving, reliable sealing, small size, light weight, space saving, and convenient maintenance. The Y-type filter 244 mainly functions to intercept impurities, protect equipment, and maintain stable system operation. Of course, in order to avoid the failure of valves on the main pipeline from affecting the normal operation of the pipeline, spare bypass pipelines are provided on both the cold water outlet pipe 242 and the hot water outlet pipe 252, and turbine manual butterfly valves 243 are also provided on the bypass pipelines.

[0074] Furthermore, in this embodiment, the energy-saving control method for RTO hot fresh air waste heat recovery and recycling also includes an air volume control method for the AHU air conditioning system. The air volume control method for the AHU air conditioning system includes the following steps: First, the AHU air conditioning system's supply fan is started by frequency conversion; then, the air volume data in the main supply air duct of the AHU air conditioning system is acquired; then, the control system 600 controls the supply fan to automatically adjust its operating frequency based on the air volume data. In other words, the AHU air conditioning system's supply fan is started by frequency conversion, and its operating frequency can be automatically adjusted based on the air volume measured in the main supply air duct 232 of the air conditioning supply duct 230, thereby achieving automatic control of the air volume and saving energy consumption of the AHU air conditioning system through the frequency conversion of the supply fan.

[0075] In addition, in this embodiment, a second temperature probe 630 and a supply air check valve 231 are provided on the air conditioning supply duct 230. The second temperature probe 630 is located between the air outlet 214 and the supply air check valve 231; the second temperature probe 630 is connected to the control system 600. The supply air check valve 231 mainly prevents the supply airflow from flowing back and protects the air conditioning unit 210. The second temperature probe 630 is used to monitor the supply air temperature in the air conditioning supply duct 230, thereby providing temperature data for the automatic control of the AHU air conditioning system. A static pressure box 280 connecting the air supply duct 230 and the air outlet 214 is also provided near the air outlet 214. The static pressure box 280 can optimize airflow distribution, stabilize system pressure, and improve overall performance.

[0076] Furthermore, such as Figure 2 and Figure 5 As shown, there are multiple diffusers 270, which are spaced out on the ceiling 110. This arrangement helps improve the uniformity of air supply. The air supply duct 230 includes a main air supply duct 232 and multiple branch air supply ducts 233. Each diffuser 270 is connected to the main air supply duct 232 through a branch air supply duct 233. Each branch air supply duct 233 is equipped with an airflow regulating valve 234. Thus, the airflow of each diffuser 270 can be adjusted through the corresponding airflow regulating valve 234. In addition, to further improve the uniformity of air supply and to better exhaust the air in the production workshop 130 to the upper static pressure layer 120 via the second exhaust louver 530, the second exhaust louver 530 is preferably located in the area of ​​the ceiling 110 near the surrounding walls, while the multiple diffusers 270 occupy most of the area of ​​the ceiling 110.

[0077] In addition, corresponding components are also provided for the return air of the AHU air conditioning system. Please refer to [link / reference]. Figure 2 , Figure 4 , Figure 7 as well as Figure 8In this embodiment, the environmentally friendly workshop also includes a return air column wall 140, the upper end of which is connected to the ceiling 110, and the lower end of which is connected to the ground. The return air column wall 140 and the surrounding walls form a return air shaft 150. The AHU air conditioning system also includes return air louvers 223, which are located at the lower part of the return air column wall 140 and connect the production workshop 130 and the return air shaft 150. One end of the air conditioning return air duct 220 extends from the static pressure layer 120 above the ceiling, through the ceiling 110, and into the return air shaft 150. Specifically, the return air column wall 140 is a color steel plate return air column wall 140, and the return air louvers 223 are specifically three-sided return air louvers 223 that improve return air efficiency. Air in production workshop 130 passes sequentially through return air louvers 223 and return air shaft 150 before entering the air conditioning return air duct 220 located at the top of the return air shaft 150, and finally returns to the air conditioning unit 210 through the air conditioning return air duct 220. Here, for the two separate production workshops 130, a single main duct of the air conditioning return air duct 220 can be shared, and the main duct of the air conditioning return air duct 220 is also connected to two return air branch ducts, each extending into the return air shaft 150 of each production workshop 130.

[0078] Furthermore, the air conditioning return air duct 220 is equipped with a third temperature probe 640, a first humidity probe 650, a first return air manual damper 221, and a second return air manual damper 222. The third temperature probe 640 and the first humidity probe 650 are both connected to the control system 600. The third temperature probe 640 measures the actual temperature inside the air conditioning return air duct 220, thus obtaining the actual return air temperature data. The first humidity probe 650 measures the actual humidity inside the air conditioning return air duct 220, thus obtaining the actual return air humidity data. This data is then transmitted to the control system 600. The first return air manual damper 221 is located near the return air outlet 213, and the second return air manual damper 222 is located near the ceiling 110, to respectively control the airflow and opening / closing of both ends of the air conditioning return air duct 220. Similarly, a static pressure box 280 connecting the two is also provided near the return air outlet 213 in the air conditioning return air duct 220.

[0079] In this embodiment, after the RTO hot fresh air system is started in the RTO hot fresh air state, the following steps are also included:

[0080] After the RTO hot fresh air system starts for a preset period of time, the actual return air temperature data is reacquired, and the control system 600 recalculates the temperature difference based on the actual return air temperature data and the standard return air temperature data.

[0081] When the temperature difference is positive, the control system 600 controls the opening ratio of the hot fresh air electric valve 320 on the hot fresh air duct 310 of the RTO hot fresh air system to decrease.

[0082] When the temperature difference is negative, the control system 600 increases the opening ratio of the hot fresh air electric valve 320.

[0083] In other words, a positive temperature difference indicates that the RTO is supplying too much hot fresh air, and the opening ratio of the hot fresh air electric valve 320 should be reduced; conversely, a negative temperature difference indicates that the RTO is supplying too little hot fresh air, and the opening ratio of the hot fresh air electric valve 320 should be increased. In this way, after the RTO hot fresh air system is turned on, the opening ratio of the hot fresh air electric valve 320 can be automatically adjusted to further save energy.

[0084] Accordingly, in this embodiment, please refer to Figure 2 and Figure 7 In this embodiment, the RTO hot fresh air system also includes an RTO device and a hot fresh air manual valve 440330; the hot fresh air generated by the RTO device enters the air conditioning unit 210 through the hot fresh air duct 310 and the first air inlet 211; the hot fresh air manual valve 440330 is installed on the hot fresh air duct 310 and is located between the hot fresh air electric valve 320 and the first air inlet 211. The hot fresh air manual valve 440330 serves as a backup regulating valve and can still control the RTO hot fresh air when the hot fresh air electric valve 320 fails. Specifically, the hot fresh air electric valve 320 is an electric proportional shut-off valve. When the RTO hot fresh air waste heat recovery and recycling energy-saving device is in RTO hot fresh air state, the hot fresh air electric valve 320 opens, and the clean and high-temperature RTO hot fresh air generated after the RTO equipment is running can be connected to the first air inlet 211 of the air conditioning unit 210 through the hot fresh air pipe 310. Then, after mixing with the indoor circulating air in the heating section of the air conditioning unit 210, it is sent to the production workshop 130 through the air conditioning supply pipe 230, thereby achieving the energy-saving effect of utilizing RTO hot fresh air.

[0085] In this embodiment, as Figures 3 to 8As shown, the outdoor fresh air system also includes a rainproof louvered fan 430 and a manual fresh air valve 440. The rainproof louvered fan 430 is located at the end of the outdoor fresh air duct 410 away from the air conditioning unit 210. The manual fresh air valve 440 is located on the outdoor fresh air duct 410 and between the rainproof louvered fan 430 and the electric fresh air valve 420. A first pressure probe 610 is also provided in the static pressure layer 120 above the ceiling. Both the electric fresh air valve 420 and the first pressure probe 610 are connected to the control system 600. When the RTO hot fresh air waste heat recovery and recycling energy-saving device is in RTO hot fresh air state, the electric fresh air valve 420 is opened, and the valve ratio can be adjusted according to the pressure data measured by the first pressure probe 610 in the static pressure layer 120 above the ceiling. At the same time, the control system 600 can also adjust the ratio of cold water and hot water according to the actual working conditions to ensure that the indoor working conditions are not affected. In addition, the fresh air manual valve 440 serves as a backup regulating valve, ensuring valve regulation in case of failure of the outdoor fresh air electric valve 420; the fresh air rainproof louver 430 mainly serves to introduce outdoor fresh air and prevent rainwater from entering the air conditioning unit 210 through the outdoor fresh air duct 410.

[0086] Furthermore, in this embodiment, the environmental protection workshop includes a production workshop 130 and a static pressure layer 120 above the production workshop 130. The exhaust system includes a workshop exhaust fan 540 located in the production workshop 130 and a static pressure layer exhaust fan 550 located in the static pressure layer 120. The control system 600 controls the start of the exhaust system in the following steps: First, the control system 600 acquires the indoor and outdoor pressure difference, the temperature data of the static pressure layer 120, and the opening degree of the cold water electric valve 245, and determines whether the preset exhaust conditions are met based on the temperature data of the static pressure layer 120 and the opening degree of the cold water electric valve 245. If the indoor and outdoor pressure difference is positive and / or the preset exhaust conditions are met, both the workshop exhaust fan 540 and the static pressure layer exhaust fan 550 are started by frequency conversion. The preset exhaust conditions are that the temperature of the static pressure layer 120 on the upper part of the ceiling is greater than 28°C for 10 consecutive minutes, and the cold water electric valve 245 is fully open. In other words, the exhaust system should be started under any of the following conditions: First, the pressure difference between indoors and outdoors is positive, i.e., the production workshop 130 is under positive pressure; Second, the temperature in the production workshop 130 is too high for a long time, for example, exceeding 28°C for 10 consecutive minutes, and the cold water electric valve 245 of the cold water pipe 240 is fully open.

[0087] Here, when the workshop exhaust fan 540 and the static pressure layer exhaust fan 550 are running, their frequencies are gradually increased from 35HZ to 50HZ within a preset time according to the program logic. That is, the frequency is gradually increased over time to avoid excessive indoor pressure leading to positive pressure.

[0088] Specifically, such as Figures 3 to 8As shown, the indoor exhaust ventilation system includes a first exhaust louver 520, a second exhaust louver 530, and a workshop exhaust fan 540. Both the first exhaust louver 520 and the workshop exhaust fan 540 are located in the upper static pressure layer 120 of the ceiling, with the workshop exhaust fan 540 positioned below the first exhaust louver 520. The second exhaust louver 530 is installed on the ceiling 110 and connected to the workshop exhaust fan 540. The outdoor exhaust ventilation system includes a static pressure layer exhaust fan 550. One end of an exhaust duct 510 extending out of the environmental protection workshop is connected to the static pressure layer exhaust fan 550, and the other end of the exhaust duct 510, located in the upper static pressure layer 120 of the ceiling, is connected to the first exhaust louver 520. In this way, the air inside the production workshop 130 can be discharged through the second exhaust louver 530 to the upper static pressure layer 120 of the ceiling by the workshop exhaust fan 540; then, the air in the upper static pressure layer 120 can enter the exhaust duct 510 through the first exhaust louver 520, and then be discharged to the outside by the static pressure layer exhaust fan 550 connected to the exhaust duct 510. Specifically, as follows... Figure 2 As shown, the exhaust duct 510 includes a main exhaust pipe and multiple branch exhaust pipes, each of which is connected to a first exhaust louver 520. In this embodiment, the intermediate wall divides the entire environmental protection workshop into two spaces, each with a ceiling static pressure layer 120 and a production workshop 130. The two ceiling static pressure layers 120 can share a single exhaust duct 510. Each ceiling static pressure layer 120 has two branch exhaust pipes that connect to two first exhaust louvers 520 respectively. Of course, in other embodiments, the number and distribution of the first exhaust louvers 520 and exhaust branch pipes can be set according to the actual situation of the workshop, and no special restrictions are imposed here. In addition, as Figure 3 As shown, the outdoor ventilation equipment also includes components such as the exhaust rainproof louver 560 and the exhaust check valve 570. The exhaust rainproof louver 560 mainly serves to prevent rainwater from entering the static pressure layer exhaust fan 550, while the exhaust check valve 570 serves to prevent gas backflow, protect the fan, save energy, and improve the fan's operating efficiency.

[0089] Furthermore, the exhaust duct 510 is equipped with an electric exhaust valve 580 and a manual exhaust valve 590, with the manual exhaust valve 590 located between the electric exhaust valve 580 and the static pressure layer exhaust fan 550. A first temperature probe 620 is also installed in the static pressure layer 120 above the ceiling. Both the static pressure layer exhaust fan 550 and the first temperature probe 620 are connected to the control system 600. The first temperature probe 620 can monitor the temperature of the static pressure layer 120 above the ceiling. When the temperature inside the workshop is high, the control system 600 can activate the workshop exhaust fan 540 and the static pressure layer exhaust fan 550 according to the actual temperature, thereby discharging excess high-temperature air to the outside and cooling the workshop.

[0090] Furthermore, in this embodiment, a make-up air pressure relief valve 700 is provided on the wall where the upper static pressure layer 120 intersects with the outside. The make-up air pressure relief valve 700 is connected to the control system 600. The make-up air pressure relief valve 700 mainly serves to assist in regulating the pressure of the static pressure layer.

[0091] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for energy-saving control of waste heat recovery and recycling of RTO hot fresh air, used for environmental control in environmental protection workshops, characterized in that, The energy-saving control method for RTO hot fresh air waste heat recovery and recycling is based on an RTO hot fresh air waste heat recovery and recycling energy-saving device. This device includes an AHU air conditioning system, an outdoor fresh air system, an exhaust system, and a control system. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling includes the following steps: The system acquires the actual return air temperature and humidity data in the air conditioning return air duct of the AHU air conditioning system. The difference between the actual return air temperature data and the preset standard return air temperature data is the temperature difference, and the difference between the actual return air humidity data and the preset standard return air humidity data is the humidity difference. The control system controls the opening ratio of the cold water electric valve, the hot water electric valve, and the valve on the humidification pipe according to the temperature difference and the humidity difference to achieve constant temperature and humidity control in the environmental protection workshop. The system acquires outdoor temperature data of the environmental protection workshop, and the difference between the outdoor temperature data and the actual return air temperature data is the indoor-outdoor temperature difference. If the indoor-outdoor temperature difference is greater than a set first threshold, the control system controls the RTO hot fresh air waste heat recovery and recycling energy-saving device to enter the RTO hot fresh air state, the RTO hot fresh air system is started and the outdoor fresh air system is closed, and the RTO hot fresh air provided by the RTO hot fresh air system is delivered to the environmental protection workshop through the air conditioning supply duct. If the RTO hot fresh air system is shut down for any reason, the control system controls the RTO hot fresh air waste heat recovery and recycling energy-saving device to enter the outdoor fresh air state, the outdoor fresh air system is started and the RTO hot fresh air system is closed. In both the RTO hot fresh air state and the outdoor fresh air state, the control system adjusts the opening ratio of the cold water electric valve, the hot water electric valve and the valve on the humidification pipe according to the re-measured temperature difference and humidity difference to achieve constant temperature and humidity control in the environmental protection workshop. The system acquires indoor air pressure data inside the environmental protection workshop and outdoor air pressure data outside the environmental protection workshop. The difference between the indoor air pressure data and the outdoor air pressure data is the indoor-outdoor pressure difference. If the indoor-outdoor pressure difference is positive and / or reaches the preset exhaust conditions, the control system controls the exhaust system to start until the indoor-outdoor pressure difference is negative and does not exceed the preset exhaust conditions.

2. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in claim 1, characterized in that, The control system controls the opening ratios of the cold water electric valve, the hot water electric valve, and the valves on the humidification pipe according to the temperature difference and the humidity difference to achieve constant temperature and humidity control in the environmental protection workshop. The steps include the following sub-steps: When the temperature difference is positive, the control system calculates the cooling demand based on the temperature difference and increases the opening ratio of the cold water electric valve and / or decreases the opening ratio of the hot water electric valve according to the cooling demand. When the temperature difference is negative, the control system calculates the heating demand based on the temperature difference and increases the opening ratio of the hot water electric valve and / or decreases the opening ratio of the cold water electric valve according to the heating demand. When the humidity difference is positive, the control system calculates the dehumidification requirement based on the humidity difference and reduces the opening ratio of the valve on the humidification pipe according to the dehumidification requirement. When the humidity difference is negative, the control system calculates the humidification demand based on the humidity difference and increases the opening ratio of the valve on the humidification pipe according to the humidification demand.

3. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in claim 1, characterized in that, In the RTO hot fresh air state, after the RTO hot fresh air system is started, the following steps are also included: After the RTO hot fresh air system has been started for a preset period of time, the actual return air temperature data is reacquired, and the control system recalculates the temperature difference based on the actual return air temperature data and the standard return air temperature data. When the temperature difference is positive, the control system controls the opening ratio of the electric valve on the hot air duct of the RTO hot air system to decrease. When the temperature difference is negative, the control system increases the opening ratio of the hot fresh air electric valve.

4. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in claim 1, characterized in that, The aforementioned RTO hot fresh air waste heat recovery and recycling energy-saving control method also includes the air volume control method of the AHU air conditioning system, which includes the following steps: The AHU air conditioning system's blower starts with frequency conversion; Obtain the air volume data in the main air duct of the AHU air conditioning system; The control system controls the blower to automatically adjust its operating frequency based on the air volume data.

5. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in any one of claims 1 to 4, characterized in that, The environmentally friendly workshop includes a production workshop and a static pressure layer above the ceiling above the production workshop. The exhaust system includes a workshop exhaust fan located in the production workshop and a static pressure layer exhaust fan located in the static pressure layer above the ceiling. The control system controls the opening of the exhaust system by the following steps: The control system acquires the indoor-outdoor pressure difference, the temperature data of the static pressure layer above the ceiling, and the opening degree of the cold water electric valve, and determines whether the preset exhaust conditions are met based on the temperature data of the static pressure layer above the ceiling and the opening degree of the cold water electric valve. If the indoor-outdoor pressure difference is positive and / or the preset exhaust conditions are met, both the workshop exhaust fan and the static pressure layer exhaust fan will start with frequency conversion. The preset exhaust conditions are that the temperature data of the static pressure layer on the upper part of the ceiling is greater than 28°C within 10 consecutive minutes, and the cold water electric valve is in the fully open state.

6. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in claim 5, characterized in that, Both the workshop exhaust fan and the static pressure layer exhaust fan gradually increase their frequency from 35Hz to 50Hz within a preset time.

7. The energy-saving control method for RTO hot fresh air waste heat recovery and recycling as described in claim 5, characterized in that, An air supply pressure relief valve is installed on the wall where the static pressure layer above the ceiling intersects with the outside. The air supply pressure relief valve is connected to the control system.

8. An energy-saving device for recovering and recycling waste heat from RTO fresh air, characterized in that, For use in an environmentally friendly workshop, the environmentally friendly workshop includes a floor, top walls, peripheral walls, and a ceiling, the top walls, the ceiling, and the peripheral walls forming an upper static pressure layer, the ceiling, the floor, and the peripheral walls forming the environmentally friendly workshop, characterized in that the RTO hot fresh air waste heat recovery and recycling energy-saving device includes: An AHU (Air Conditioning Unit) air conditioning system includes an air conditioning unit, an air conditioning return duct, an air conditioning supply duct, a chilled water pipe, a hot water pipe, a humidifier pipe, and several diffusers. The air conditioning unit includes a first air inlet, a second air inlet, a return air outlet, and an air outlet. One end of the air conditioning return duct extends from the static pressure layer above the ceiling into the environmental protection workshop, and the other end of the air conditioning return duct is connected to the return air outlet. One end of the air conditioning supply duct is located in the static pressure layer above the ceiling and is connected to a diffuser installed on the ceiling, and the other end of the air conditioning supply duct is connected to the air outlet. RTO hot fresh air system includes a hot fresh air duct connected to the first air inlet and a hot fresh air electric valve provided on the hot fresh air duct. An outdoor fresh air system includes an outdoor fresh air duct connected to the second air inlet and an outdoor fresh air electric valve installed on the outdoor fresh air duct. The ventilation system includes ventilation ducts, indoor ventilation equipment, and outdoor ventilation equipment; the indoor ventilation equipment is installed in the static pressure layer above the ceiling and on the ceiling, and at least a portion of the indoor ventilation equipment is connected to the outdoor ventilation equipment through the ventilation ducts; The control system is connected to the AHU air conditioning system, the RTO hot fresh air system, the outdoor fresh air system, and the exhaust system respectively. The RTO hot fresh air waste heat recovery and recycling energy-saving device includes an RTO hot fresh air state and an outdoor fresh air state. In the RTO hot fresh air state, the RTO hot fresh air system is turned on and the outdoor fresh air system is turned off. In the outdoor fresh air state, the RTO hot fresh air system is turned off and the outdoor fresh air system is turned on. In either the RTO hot fresh air state or the outdoor fresh air state, the AHU air conditioning system is used to control the environmental protection workshop to be in a constant temperature and humidity state, and the exhaust system is used to control both the upper static pressure layer of the ceiling and the environmental protection workshop to be in a slightly negative pressure state.

9. The RTO hot fresh air waste heat recovery and recycling energy-saving device as described in claim 8, characterized in that, The RTO hot fresh air system also includes an RTO device and a hot fresh air manual valve; the hot fresh air generated by the RTO device enters the air conditioning unit through the hot fresh air duct and the first air inlet; the hot fresh air manual valve is located on the hot fresh air duct and between the hot fresh air electric valve and the first air inlet. The outdoor fresh air system also includes a rainproof louvered fan and a manual fresh air valve; the rainproof louvered fan is located at the end of the outdoor fresh air duct away from the air conditioning unit, and the manual fresh air valve is located on the outdoor fresh air duct, between the rainproof louvered fan and the electric fresh air valve; a first pressure probe is also provided in the static pressure layer at the top of the ceiling; both the electric fresh air valve and the first pressure probe are connected to the control system.

10. The RTO hot fresh air waste heat recovery and recycling energy-saving device as described in claim 9, characterized in that, The indoor exhaust ventilation equipment includes a first exhaust louver, a second exhaust louver, and a workshop exhaust fan. The first exhaust louver and the workshop exhaust fan are both located in the upper static pressure layer of the ceiling, and the workshop exhaust fan is located below the first exhaust louver. The second exhaust louver is installed on the ceiling and is connected to the workshop exhaust fan. The outdoor ventilation equipment includes a static pressure layer exhaust fan. One end of the exhaust pipe extending out of the environmental protection workshop is connected to the static pressure layer exhaust fan, and the other end of the exhaust pipe located in the static pressure layer above the ceiling is connected to the first exhaust louver. The exhaust pipe is equipped with an electric exhaust valve and a manual exhaust valve, and the manual exhaust valve is located between the electric exhaust valve and the static pressure layer exhaust fan. The upper static pressure layer of the ceiling is also equipped with a first temperature probe, and both the exhaust fan of the static pressure layer and the first temperature probe are connected to the control system.

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