RTO hot fresh air waste heat recovery and cyclic utilization energy-saving control method and device

Abstract

According to the RTO hot fresh air waste heat recovery and cyclic utilization 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 constant-humidity control over an environment-friendly workshop is achieved; if the indoor and outdoor temperature difference value is larger than the first threshold value, the RTO hot fresh air state that the RTO hot fresh air system is started and the outdoor fresh air system is closed is started; if the RTO hot fresh air system is stopped due to reasons, an outdoor fresh air state that the outdoor fresh air system is started and the RTO hot fresh air system is closed is started; in the RTO hot fresh air state or the outdoor fresh air state, the control system achieves constant-temperature and constant-humidity control over the environment-friendly workshop according to the re-measured temperature difference value and the re-measured humidity difference value corresponding to the opening degree proportion of the valve; and if the indoor and outdoor pressure difference is a positive number and / or reaches the preset exhaust condition, the control system controls the exhaust system to be started. The constant-temperature and constant-humidity control of the production workshop can be more efficiently achieved, and the purpose of saving energy is achieved through RTO hot fresh air.

Description

Technical Field

[0001] The present application belongs to the technical field of environmental protection and energy-saving devices, and more specifically, relates to an energy-saving control method and device for recovering and recycling waste heat from RTO hot fresh air. Background Art

[0002] When the temperature and humidity range needs to be considered in the workshop, hot water or electric heating is usually used to provide heat to the equipment, which is then delivered to the workshop through air ducts, raising the workshop temperature to reach the required heating temperature. However, both hot water and electric heating consume very high energy. At the same time, production equipment also generates a large amount of hot exhaust air during the production process, resulting in energy waste. Summary of the Invention

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

[0004] To achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide an RTO hot fresh air waste heat recovery and recycling energy-saving control method for environmental control of an environmental protection workshop, the RTO hot fresh air waste heat recovery and recycling energy-saving control method is based on an RTO hot fresh air waste heat recovery and recycling energy-saving device, the RTO hot fresh air waste heat recovery and recycling energy-saving device includes an AHU air-conditioning system, an outdoor fresh air system, an exhaust system and a control system, the RTO hot fresh air waste heat recovery and recycling energy-saving control method includes the following steps:

[0005] The actual return air temperature and humidity data in the return air duct of the AHU air conditioning system are obtained. The difference between the actual return air temperature and the preset standard return air temperature is the temperature difference, and the difference between the actual return air humidity and the preset standard return air humidity is the humidity difference. The control system controls the opening ratio of the cold water electric valve, hot water electric valve, and 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 outdoor temperature data of the environmental protection workshop is obtained, and the difference between the outdoor temperature data and the actual return air temperature data is the indoor and outdoor temperature difference; if the indoor and outdoor temperature difference is greater than the 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 shut down, and the RTO hot fresh air provided by the RTO hot fresh air system is transported to the environmental protection workshop through the air-conditioning supply duct; when the RTO hot fresh air system is deactivated for some 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 shut down; in the RTO hot fresh air state or 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 of the environmental protection workshop;

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

[0008] Optionally, 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 of the environmental protection workshop, including the following sub-steps:

[0009] 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;

[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, the RTO hot fresh air system may further include the following steps after startup:

[0014] After the RTO hot fresh air system starts for a preset period of time, the actual return air temperature data is obtained again, 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 controls the opening ratio of the hot fresh air electric valve on the hot fresh air pipe of the RTO hot fresh air system to decrease;

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

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

[0018] Frequency conversion start of the blower of the AHU air conditioning system;

[0019] Obtain the air flow data in the main air supply duct of the AHU air conditioning system;

[0020] The control system controls the blower to automatically adjust the operating frequency of the blower according to the air supply volume data.

[0021] Optionally, the environmental protection workshop includes a production workshop and a static pressure layer above the production workshop, the exhaust system includes a workshop exhaust fan provided in the production workshop and a static pressure layer exhaust fan provided in the static pressure layer above the ceiling; and the step of controlling the exhaust system to be turned on by the control system includes the following sub-steps:

[0022] The control system obtains the indoor and outdoor pressure difference, the temperature data of the static pressure layer above the ceiling, and the opening 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 of the cold water electric valve;

[0023] If the indoor and outdoor pressure difference is positive and / or the preset exhaust conditions are met, the workshop exhaust fan and the static pressure layer exhaust fan are both started with variable frequency;

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

[0025] Optionally, the workshop exhaust fan and the static pressure layer exhaust fan are gradually increased in frequency from 35HZ to 50HZ within a preset time.

[0026] Optionally, an air supply residual pressure valve is provided on the wall where the static pressure layer above the ceiling intersects with the outdoors, and the air supply residual pressure valve is connected to the control system information.

[0027] The present application also proposes an RTO hot fresh air waste heat recovery and recycling energy-saving device, which is characterized by being used in an environmental protection workshop, the environmental protection workshop including a floor, a top wall, a peripheral wall, and a ceiling, the top wall, the ceiling, and the peripheral wall forming an upper static pressure layer of the ceiling, and the ceiling, the floor, and the peripheral wall forming an environmental protection workshop, characterized by the RTO hot fresh air waste heat recovery and recycling energy-saving device comprising:

[0028] The AHU air conditioning system includes an air conditioning cabinet, an air conditioning return duct, an air conditioning supply duct, a cold water pipe, a hot water pipe, a humidification pipe, and several diffusers. The air conditioning cabinet includes a first air inlet, a second air inlet, a return air duct, 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 the diffuser installed on the ceiling. The other end of the air conditioning supply duct is connected to the air outlet.

[0029] The RTO hot fresh air system includes a hot fresh air pipe connected to the first air inlet and a hot fresh air electric valve provided on the hot fresh air pipe;

[0030] An outdoor fresh air system, comprising an outdoor fresh air duct connected to the second air inlet and an outdoor fresh air electric valve provided on the outdoor fresh air duct;

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

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

[0033] Among them, 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 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 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 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 further includes an RTO device and a hot fresh air manual air valve; the hot fresh air generated by the RTO device enters the air conditioning cabinet through the hot fresh air duct and the first air inlet; the hot fresh air manual air valve is provided on the hot fresh air duct and is located between the hot fresh air electric valve and the first air inlet;

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

[0036] Optionally, the indoor exhaust 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 arranged 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 exhaust equipment includes a static pressure layer exhaust fan. One end of the exhaust duct extending from the environmental protection workshop is connected to the static pressure layer exhaust fan. The other end of the exhaust duct located in the static pressure layer above the ceiling is connected to the first exhaust louver. The exhaust duct is equipped with an exhaust electric valve and an exhaust manual air valve, and the exhaust manual air valve is located between the exhaust electric valve and the static pressure layer exhaust fan.

[0038] A first temperature probe is also provided in the static pressure layer above the ceiling, and the static pressure layer exhaust fan and the first temperature probe are both connected to the control system information.

[0039] The beneficial effects of the RTO hot fresh air waste heat recovery and recycling energy-saving control method provided in the present application are: first, after the AHU air-conditioning system is turned on, the actual return air temperature data and actual return air humidity data on the air-conditioning return air duct will be monitored through the 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 and compare them with the preset standard temperature and humidity conditions, and then calculate the demand for cooling, heating, dehumidification or humidification, and then realize the input control of cold water and hot water by controlling the opening ratio of the cold water electric valve, hot water electric valve and the valve on the humidification pipe, thereby realizing constant temperature and humidity control of the environmental protection workshop. Then, when the heat generation in the environmental protection workshop is high and the outdoor temperature is low, that is, the indoor and outdoor temperature difference is greater than a preset first threshold, the control system will control the RTO hot fresh air system to open the RTO hot fresh air system and shut down the outdoor fresh air system, that is, enter the RTO hot fresh air state. The clean, high-temperature hot fresh air generated by the RTO equipment can be connected to the heating section of the air conditioning cabinet and mixed with the indoor circulating air before being delivered to the production workshop, thereby achieving energy saving. At the same time, the control system will automatically adjust the input ratio of cold water and hot water based on the re-measured temperature and humidity conditions to ensure that the production workshop maintains a qualified constant temperature and humidity. In certain special circumstances, such as when the RTO hot fresh air system needs to be shut down for maintenance, the RTO hot fresh air waste heat recovery and recycling energy-saving device will enter the outdoor fresh air state, and the backup outdoor fresh air system will be controlled to open and the RTO hot fresh air system will be shut down. At the same time, the control system will automatically adjust the input ratio of cold water and hot water based on the outdoor working conditions and the re-measured temperature and humidity conditions to ensure that the indoor working conditions are not affected when the RTO hot fresh air system is not in use. Then, when the temperature in the environmental protection workshop is high and / or the indoor pressure is positive, that is, when the indoor and outdoor pressure difference is positive and / or the preset exhaust conditions are reached, the control system will turn on the exhaust system according to the relevant monitoring data, thereby ensuring that the temperature in the production workshop meets the requirements and that the static pressure layer above the ceiling and the production workshop are both in a slightly negative pressure state. In summary, the present RTO hot fresh air waste heat recovery and recycling energy-saving control method and device can enable the environmental protection workshop to achieve the technical effect of environmental protection and energy saving by utilizing the automatic control of the RTO hot fresh air of the RTO hot fresh air system under the conditions of constant temperature, constant humidity and slightly negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1Flow chart of the energy-saving control method for recovering and recycling waste heat from RTO hot fresh air provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of the RTO hot fresh air waste heat recovery and recycling energy-saving device provided in an embodiment of the present application;

[0043] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0044] Figure 4 for Figure 2 A magnified schematic diagram of point B in the middle;

[0045] Figure 5 for Figure 2 The enlarged schematic diagram of point C in the middle;

[0046] Figure 6 for Figure 2 The enlarged schematic diagram of point D in the middle;

[0047] Figure 7 for Figure 2 The enlarged schematic diagram of point E in the middle;

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

[0049] Description of Figure Numbers:

[0050]

[0051]

[0052] DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0054] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

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

[0056] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0058] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0059] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0060] The embodiments of the present application provide an energy-saving control method and device for recovering and recycling waste heat from RTO hot fresh air.

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

[0062] S1. Acquire actual return air temperature data and actual return air 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, 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 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 based on the temperature difference and the humidity difference 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 and outdoor temperature difference; if the indoor and 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 is started and the outdoor fresh air system is turned off, and the RTO hot fresh air provided by the RTO hot fresh air system is transported to the environmental protection workshop through the air-conditioning supply duct 230; when the RTO hot fresh air system is deactivated for some 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 is started and the RTO hot fresh air system is turned off; in 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 re-measured temperature difference and humidity difference to achieve constant temperature and humidity control of the environmental protection workshop;

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

[0065] It should be noted that the environmental protection workshop includes a floor, a top wall, peripheral walls, and a ceiling 110. The top wall, ceiling 110, and peripheral walls form the upper static pressure layer 120. The ceiling 110, floor, and peripheral walls form the production workshop 130. The ceiling 110 is preferably a color-coated 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 air system, and exhaust system, communicate with the control system 600 via wireless and / or wired connections. The control system 600 then automatically controls each system based on the corresponding monitoring results. Since the air in the air conditioning return duct 220 is directly drawn from the production workshop 130, the measured actual return air temperature and humidity data are substantially consistent with the actual temperature and humidity within the production workshop 130. In addition, the first threshold, the preset standard return air temperature data, the preset standard return air humidity data, and the preset exhaust conditions can be set according to actual needs.

[0066] Accordingly, if Figures 2 to 7As shown, the 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 cabinet 210, an air conditioning return air duct 220, an air conditioning supply air duct 230, a cold water pipe 240, a hot water pipe 250, a humidification pipe 260, and a plurality of diffusers 270. The air conditioning cabinet 210 includes a first air inlet 211, a second air inlet 212, a return air duct 213, and an air outlet 214. One end of the air conditioning return air duct 220 extends from the static pressure layer 120 above 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 duct 213. One end of the air conditioning supply air duct 230 is located in the static pressure layer 120 above the ceiling and is connected to the diffuser 270 installed on the ceiling 110. The other end of the air conditioning supply air duct 230 is connected to the air outlet 214. The RTO hot fresh air system includes a hot fresh air duct 310 connected to the first air inlet 211 and a hot fresh air electric valve 320 provided 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 provided 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 provided in the static pressure layer 120 above the ceiling and on the ceiling 110, and at least part of the indoor exhaust equipment is connected to the outdoor exhaust equipment via the exhaust duct 510. The control system 600 is respectively connected to the AHU air conditioning system, the RTO hot fresh air system, the outdoor fresh air system, and the exhaust system. During 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 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 the RTO hot fresh air state or the 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 the static pressure layer 120 above the ceiling 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 the present application, first, after the AHU air-conditioning system is turned on, the actual return air temperature data and the actual return air humidity data on the air-conditioning return air duct 220 will be monitored through the relevant temperature and humidity sensors. The control system 600 can calculate the temperature difference and humidity difference based on the monitored return air temperature and humidity and compare them with the preset standard temperature and humidity conditions, and then calculate the demand for cooling, heating, dehumidification or humidification, and then realize the input control of cold water and hot water by controlling the opening ratio of the cold water electric valve 245, the hot water electric valve 253 and the valve on the humidification pipe 260, thereby realizing constant temperature and humidity control of the environmental protection workshop. Then, when the heat generation in the environmental protection workshop is high and the outdoor temperature is low, that is, the temperature difference between indoor and outdoor is greater than the set first threshold, the control system 600 will control the RTO hot fresh air system to turn on the RTO hot fresh air and turn off the outdoor fresh air system, that is, it is in the 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 cabinet 210 and mixed with the indoor circulating air and then 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 re-measured temperature and humidity conditions 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 fresh air system needs to be shut down for maintenance, the RTO hot fresh air waste heat recovery and recycling energy-saving device will enter the outdoor fresh air state, and the backup outdoor fresh air system will be controlled to be turned on, and the RTO hot fresh air system will be turned off. At the same time, the control system 600 will automatically adjust the input ratio of cold water and hot water according to the outdoor working conditions and the re-measured temperature and humidity conditions, so as to ensure that the indoor working conditions are not affected when the RTO hot fresh air system is not in use. Then, when the temperature in the environmental protection workshop is high and / or the indoor pressure is positive, that is, the indoor and outdoor pressure difference is positive and / or the preset exhaust conditions are reached, the control system 600 will turn on the exhaust system according to the relevant monitoring data, thereby ensuring that the temperature in the production workshop 130 meets the requirements and that the static pressure layer 120 above the ceiling and the production workshop 130 are both in a slightly negative pressure state. To sum up, the RTO hot fresh air waste heat recovery and recycling energy-saving control method and device can enable the environmental protection workshop to achieve the technical effect of environmental protection and energy saving by automatically regulating the RTO hot fresh air of the RTO hot fresh air system under constant temperature, constant humidity and slight negative pressure conditions.

[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 the humidity difference to achieve constant temperature and humidity control in the environmental protection workshop, including the following sub-steps:

[0069] When the temperature difference is positive, control system 600 calculates the cooling demand based on the temperature difference and, based on the cooling demand, increases the opening ratio of cold water electric valve 245 and / or decreases the opening ratio of hot water electric valve 253. It will be understood that a positive temperature difference indicates that the actual temperature within the environmental protection workshop is higher than the standard operating condition, indicating that the workshop is overheating. In this case, by adjusting the opening ratios of the relevant valves, the cold water input can be increased, the hot water input can be decreased, or both can be increased and decreased simultaneously, thereby achieving cooling and ensuring that the temperature within the environmental protection workshop is adjusted back to the standard operating condition.

[0070] When the temperature difference is negative, control system 600 calculates the heating demand based on the temperature difference and, based on the heating demand, increases the opening ratio of hot water electric valve 253 and / or decreases the opening ratio of cold water electric valve 245. Similarly, a negative temperature difference indicates that the actual temperature inside the environmental protection workshop is below the standard operating condition, indicating that the workshop is undercooled. In this case, by adjusting the opening ratios of the relevant valves, the cold water input can be reduced, the hot water input can be increased, or both can be reduced and increased simultaneously, thereby increasing the temperature and ensuring that the temperature inside the environmental protection workshop is adjusted back to the standard operating condition.

[0071] When the humidity difference is positive, control system 600 calculates the dehumidification demand based on the humidity difference and reduces the valve opening ratio on humidification pipe 260 accordingly. A positive humidity difference indicates that the actual humidity within the environmental protection workshop is higher than the standard operating condition, indicating that the workshop is overhumidified. In this case, by adjusting the opening ratio of the relevant valves, the humidity can be reduced, ensuring that the humidity within the environmental protection workshop is adjusted back to the standard operating condition.

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

[0073] In order to achieve the above-mentioned precise adjustment of temperature and humidity, the AHU air conditioning system is equipped with corresponding component structures. 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, each connected to the air conditioning cabinet 210. The cold water pipe 240 includes a cold water inlet pipe 241 and a cold water outlet pipe 242, each connected to the air conditioning cabinet 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. In this way, 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 based on the heating and cooling demand, thereby achieving control over the input of cold and hot water. A humidification electric valve 261 is provided on the humidification pipe 260, and the humidification electric valve 261 is connected to the control system 600. Therefore, the control system 600 can automatically control the humidity by controlling the ratio of the humidification electric valve 261 based on the calculated dehumidification and humidification demand. Here, the turbine manual butterfly valve 243, installed on both the cold water inlet pipe 241 and the hot water inlet pipe 251, primarily regulates flow and controls opening and closing. It has the advantages of mechanical labor saving, reliable sealing, small size, light weight, space-saving installation, and easy maintenance. The Y-type filter 244 primarily intercepts impurities, protects equipment, and maintains stable system operation. Of course, in order to avoid affecting the normal operation of the pipeline when the valve on the main pipeline fails, a spare bypass pipeline is provided on the cold water outlet pipe 242 and the hot water outlet pipe 252, and a turbine manual butterfly valve 243 is also provided on the bypass pipeline.

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

[0075] In addition, in this embodiment, the air supply duct 230 is equipped with a second temperature probe 630 and an air supply check valve 231. The second temperature probe 630 is located between the air outlet 214 and the air supply check valve 231. The second temperature probe 630 is connected to the control system 600. The air supply check valve 231 primarily prevents backflow of the supply air and protects the air cabinet 210. The second temperature probe 630 is used to monitor the supply air temperature within the air supply duct 230, providing a temperature reference for the automatic control of the AHU air conditioning system. A static pressure box 280 is also installed near the air outlet 214 of the air supply duct 230, connecting the two. The static pressure box 280 optimizes airflow distribution, stabilizes system pressure, and improves overall performance.

[0076] Furthermore, if Figure 2 and Figure 5 As shown, there are multiple diffusers 270, which are distributed in intervals on the ceiling 110. This arrangement helps improve the uniformity of the air supply of the air conditioner. The air supply duct 230 includes an air supply main 232 and multiple air supply branches 233. Each diffuser 270 is connected to the air supply main 232 via an air supply branch 233. Each air supply branch 233 is equipped with an air volume control valve 234. In this way, the air supply volume of each diffuser 270 can be adjusted by the corresponding air volume control valve 234. In addition, to further improve the uniformity of the air supply and better discharge the air in the production workshop 130 to the static pressure layer 120 above the ceiling through the second exhaust louvers 530, the second exhaust louvers 530 are preferably located in the area of the ceiling 110 near the surrounding walls, while the multiple diffusers 270 occupy the majority of the area of the ceiling 110.

[0077] In addition, the return air of the AHU air conditioning system is also equipped with corresponding component structures. Figure 2 、 Figure 4 、 Figure 7 as well as Figure 8In this embodiment, the environmental protection workshop further 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 is separated from the surrounding walls to form a return air shaft 150. The AHU air conditioning system further includes return air louvers 223, which are located at the lower portion 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. Here, the return air column wall 140 is specifically a color-coated steel plate return air column wall 140, and the return air louvers 223 are specifically three-sided return air louvers 223 that can improve return air efficiency. The air in the production workshop 130 passes through the return air louvers 223 and the return air shaft 150 in sequence, then enters the air conditioning return air duct 220 at the top of the return air shaft 150. Finally, it is returned to the air conditioning cabinet 210 through the air conditioning return air duct 220. Here, the two separated production workshops 130 can share a single main pipe of the air conditioning return air duct 220, and the main pipe of the air conditioning return air duct 220 is further connected to two return air branch pipes, each of which extends 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 each connected to the control system 600. The third temperature probe 640 can measure the actual temperature within the air conditioning return air duct 220, thereby obtaining actual return air temperature data. The first humidity probe 650 can measure the actual humidity within the air conditioning return air duct 220, thereby obtaining 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 inlet 213, and the second return air manual damper 222 is located near the ceiling 110, respectively, to control the air volume and opening and closing of the air conditioning return air duct 220. Similarly, a static pressure box 280 is also located near the return air inlet 213 of the air conditioning return air duct 220, connecting the two.

[0079] In this embodiment, in the RTO hot fresh air state, the RTO hot fresh air system further includes the following steps after startup:

[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 pipe 310 of the RTO hot fresh air system to decrease;

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

[0083] In other words, a positive temperature difference indicates an oversupply of hot fresh air from the RTO, and the opening ratio of the hot fresh air electric valve 320 should be reduced. Conversely, a negative temperature difference indicates an undersupply of hot fresh air from the RTO, and the opening ratio of the hot fresh air electric valve 320 should be increased. Thus, by automatically adjusting the opening ratio of the hot fresh air electric valve 320 after the RTO hot fresh air system is activated, further energy savings can be achieved.

[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 air valve 440330; the hot fresh air generated by the RTO device enters the air conditioning cabinet 210 through the hot fresh air duct 310 and the first air inlet 211; the hot fresh air manual air valve 440330 is arranged 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 air valve 440330 serves as a backup regulating valve, which can still realize the regulation of 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 closed valve. When the RTO hot fresh air waste heat recovery and recycling energy-saving device is in the 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 cabinet 210 through the hot fresh air pipe 310, and then mixed with the indoor circulating air in the heating section of the air-conditioning cabinet 210, and then sent to the production workshop 130 through the air-conditioning supply air pipe 230, thereby achieving the energy-saving effect of utilizing RTO hot fresh air.

[0085] In this embodiment, if Figures 3 to 8As shown, the outdoor fresh air system also includes a fresh air rainproof louver fan 430 and a fresh air manual damper 440; the fresh air rainproof louver fan 430 is located at the end of the outdoor fresh air duct 410 away from the air conditioning cabinet 210, and the fresh air manual damper 440 is located on the outdoor fresh air duct 410 and is located between the fresh air rainproof louver fan 430 and the outdoor fresh air electric valve 420. A first pressure probe 610 is also provided in the upper static pressure layer 120 of the ceiling; the outdoor fresh air electric valve 420 and the first pressure probe 610 are both connected to the control system 600. When the RTO hot fresh air waste heat recovery and recycling energy-saving device is in the RTO hot fresh air state, the outdoor fresh air electric valve 420 is open and can adjust the valve ratio based on the pressure data measured by the first pressure probe 610 located in the upper static pressure layer 120 of the ceiling. At the same time, the control system 600 can also adjust the ratio of cold water and hot water according to actual operating conditions, thereby ensuring that indoor operating conditions are not affected. In addition, the fresh air manual air valve 440 serves as a backup regulating valve, which can ensure the valve regulation function when the outdoor fresh air electric valve 420 fails; the fresh air rainproof louver fan 430 mainly plays the role of introducing outdoor fresh air and preventing rainwater from entering the air conditioning cabinet 210 through the outdoor fresh air pipe 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 above the ceiling. The control system 600 controls the activation of the exhaust system in the following sub-steps: First, the control system 600 obtains the indoor and outdoor pressure differential, the temperature data of the static pressure layer 120 above the ceiling, and the opening of the cold water electric valve 245. Based on the temperature data of the static pressure layer 120 above the ceiling and the opening of the cold water electric valve 245, it determines whether the preset exhaust conditions are met. If the indoor and outdoor pressure differential 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 activated using variable frequency drive. The preset exhaust conditions are that the temperature of the static pressure layer 120 above the ceiling is greater than 28°C for 10 consecutive minutes, and the electric cold water valve 245 is fully open. In other words, the exhaust system will be activated only if one of the following conditions is met: 1. The indoor and outdoor pressure differential is positive, meaning the production workshop 130 is under positive pressure; 2. The production workshop 130 temperature is excessively high for a prolonged period, for example, exceeding 28°C for 10 consecutive minutes, and the electric cold water 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 in operation, their frequencies are gradually increased from 35HZ to 50HZ within a preset time according to the program logic, that is, they are gradually increased over time to avoid excessive indoor pressure causing positive pressure.

[0088] Specifically, if Figures 3 to 8As shown, the indoor exhaust equipment includes a first exhaust louver 520, a second exhaust louver 530, and a workshop exhaust fan 540. The first exhaust louver 520 and the workshop exhaust fan 540 are both located in the static pressure layer 120 above the ceiling, with the workshop exhaust fan 540 located below the first exhaust louver 520. The second exhaust louver 530 is installed on the ceiling 110 and is connected to the workshop exhaust fan 540. The outdoor exhaust equipment includes a static pressure layer exhaust fan 550. One end of the exhaust duct 510 extending from 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 static pressure layer 120 above the ceiling is connected to the first exhaust louver 520. In this way, the air in the production workshop 130 can be discharged to the static pressure layer 120 above the ceiling through the second exhaust louvers 530 by the workshop exhaust fan 540; then, the air in the static pressure layer 120 above the ceiling can pass through the first exhaust louvers 520 into the exhaust duct 510, and then be discharged to the outside through the static pressure layer exhaust fan 550 connected to the exhaust duct 510. Figure 2 As shown, the exhaust duct 510 includes an exhaust main pipe and a plurality of exhaust branch pipes, and each exhaust branch pipe is connected to a first exhaust louver 520. In this embodiment, the middle wall divides the entire environmental protection workshop into two spaces, and each space has a ceiling upper static pressure layer 120 and a production workshop 130. The two ceiling upper static pressure layers 120 can share one exhaust duct 510, and there are two exhaust branch pipes in one ceiling upper static pressure layer 120 to connect the two first exhaust louvers 520 respectively. Of course, in other embodiments, the number and distribution position of the first exhaust louvers 520 and exhaust branch pipes can also be set according to the actual situation of the workshop, and no special restrictions are made here. In addition, as Figure 3 As shown, the outdoor exhaust equipment also includes components such as exhaust rainproof louvers 560 and exhaust check valves 570. The exhaust rainproof louvers 560 mainly prevent rainwater from entering the static pressure layer exhaust fan 550, and the exhaust check valve 570 prevents gas backflow, protects the fan, saves energy and improves the fan's operating efficiency.

[0089] Furthermore, the exhaust duct 510 is equipped with an exhaust motorized valve 580 and an exhaust manual valve 590, with the exhaust manual valve 590 located between the exhaust motorized valve 580 and the static pressure layer exhaust fan 550. A first temperature probe 620 is also provided 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 monitors the temperature of the static pressure layer 120 above the ceiling. When the temperature inside the workshop is high, the control system 600 activates the workshop exhaust fan 540 and the static pressure layer exhaust fan 550 based on the actual temperature, thereby discharging excess high-temperature air to the outside and cooling the workshop.

[0090] Furthermore, in this embodiment, a supply air residual pressure valve 700 is provided on the wall where the static pressure layer 120 above the ceiling intersects with the outside, and the supply air residual pressure valve 700 is connected to the control system 600. The supply air residual pressure valve 700 mainly serves to assist in regulating the static pressure layer pressure.

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

Claims

1. An energy-saving control method for recycling and utilizing waste heat from RTO hot fresh air, used for environmental control in environmental protection workshops, characterized in that: The RTO hot fresh air waste heat recovery and recycling energy-saving control method is based on the RTO hot fresh air waste heat recovery and recycling energy-saving device. The RTO hot fresh air waste heat recovery and recycling energy-saving device includes an AHU air-conditioning system, an outdoor fresh air system, an exhaust system, and a control system. The RTO hot fresh air waste heat recovery and recycling energy-saving control method includes the following steps: Acquiring actual return air temperature data and actual return air humidity data in the air conditioning return air duct of the AHU air conditioning system, wherein the difference between the actual return air temperature data and the preset standard return air temperature data is a temperature difference, and the difference between the actual return air humidity data and the preset standard return air humidity data is a humidity difference. The control system controls the opening ratios 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, so as to achieve constant temperature and humidity control of the environmental protection workshop; Obtain the 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 and outdoor temperature difference; if the indoor and 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 shut down, and the RTO hot fresh air provided by the RTO hot fresh air system is transported to the environmental protection workshop through the air-conditioning supply duct; when the RTO hot fresh air system is deactivated for some 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 shut down; in the RTO hot fresh air state or 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 the humidity difference, so as to achieve constant temperature and humidity control of the environmental protection workshop; The indoor air pressure data in the environmental protection workshop and the outdoor air pressure data outside the environmental protection workshop are obtained. The difference between the indoor air pressure data and the outdoor air pressure data is the indoor and outdoor pressure difference. If the indoor and outdoor pressure difference is positive and / or reaches the preset exhaust condition, the control system controls the exhaust system to turn on until the indoor and outdoor pressure difference is negative and does not exceed the preset exhaust condition.

2. The RTO hot fresh air waste heat recovery and recycling energy-saving control method according to claim 1 is characterized in that: 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 of the environmental protection workshop, which includes the following sub-steps: When the temperature difference is a positive number, the control system calculates the cooling demand according to 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 a negative number, the control system calculates the heating demand according to 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 a positive number, the control system calculates the dehumidification demand according to the humidity difference, and reduces the opening ratio of the valve on the humidification pipe according to the dehumidification demand; When the humidity difference is a negative number, the control system calculates the humidification demand according to the humidity difference, and increases the opening ratio of the valve on the humidification pipe according to the humidification demand.

3. The RTO hot fresh air waste heat recovery and recycling energy-saving control method according to claim 1 is characterized in that: In the RTO hot fresh air state, the RTO hot fresh air system further includes the following steps after starting: After the RTO hot fresh air system is started for a preset time period, the actual return air temperature data is reacquired, and the control system recalculates the temperature difference according to the actual return air temperature data and the standard return air temperature data; When the temperature difference is a positive number, the control system controls the opening ratio of the hot fresh air electric valve on the hot fresh air pipe of the RTO hot fresh air system to decrease; When the temperature difference is a negative number, the control system controls the opening ratio of the hot fresh air electric valve to increase.

4. The RTO hot fresh air waste heat recovery and recycling energy-saving control method according to claim 1 is characterized in that: The 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, and the air volume control method of the AHU air conditioning system includes the following steps: The blower of the AHU air conditioning system is started with variable frequency; Obtaining air flow rate data in the main air supply duct of the AHU air conditioning system; The control system controls the blower to automatically adjust the operating frequency of the blower according to the air supply volume data.

5. The RTO hot fresh air waste heat recovery and recycling energy-saving control method according to any one of claims 1 to 4, characterized in that: The environmental protection workshop includes a production workshop and a static pressure layer above the production workshop. The exhaust system includes a workshop exhaust fan provided in the production workshop and a static pressure layer exhaust fan provided in the static pressure layer above the ceiling. The step of controlling the exhaust system to start by the control system includes the following sub-steps: The control system obtains the indoor and outdoor pressure difference, the temperature data of the static pressure layer above the ceiling, and the opening of the cold water electric valve, and determines whether the preset exhaust condition is met based on the temperature data of the static pressure layer above the ceiling and the opening of the cold water electric valve; If the indoor and outdoor pressure difference is positive and / or the preset exhaust condition is reached, the workshop exhaust fan and the static pressure layer exhaust fan are both frequency-controlled and started; Among them, the preset exhaust condition is that the temperature data of the static pressure layer above the ceiling measured within 10 consecutive minutes is greater than 28°C, and the cold water electric valve is in a fully open state.

6. The RTO hot fresh air waste heat recovery and recycling energy-saving control method according to claim 5 is characterized in that: The workshop exhaust fan and the static pressure layer exhaust fan are both gradually increased in frequency from 35HZ to 50HZ within a preset time.

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

8. An RTO hot fresh air waste heat recovery and recycling energy-saving device, characterized in that: Used in an environmental protection workshop, the environmental protection workshop includes a floor, a top wall, a peripheral wall, and a ceiling. The top wall, the ceiling, and the peripheral walls form an upper static pressure layer of the ceiling. The ceiling, the floor, and the peripheral walls form an environmental protection workshop. The RTO hot fresh air waste heat recovery and recycling energy-saving device includes: An AHU air conditioning system includes an air conditioning cabinet, an air conditioning return air duct, an air conditioning supply air duct, a cold water pipe, a hot water pipe, a humidifying pipe, and several diffusers; the air conditioning cabinet includes a first air inlet, a second air inlet, a return air duct, and an air outlet; one end of the air conditioning return air duct extends from the static pressure layer above the ceiling into the environmental protection workshop, and the other end of the air conditioning return air duct is connected to the return air duct; one end of the air conditioning supply air duct is located in the static pressure layer above the ceiling and is connected to the diffuser installed on the ceiling, and the other end of the air conditioning supply air duct is connected to the air outlet; The RTO hot fresh air system comprises a hot fresh air pipe connected to the first air inlet and a hot fresh air electric valve provided on the hot fresh air pipe; An outdoor fresh air system, comprising an outdoor fresh air pipe connected to the second air inlet and an outdoor fresh air electric valve provided on the outdoor fresh air pipe; An exhaust system includes an exhaust pipe, indoor exhaust equipment, and outdoor exhaust equipment; the indoor exhaust equipment is provided in the static pressure layer above the ceiling and on the ceiling, and at least part of the indoor exhaust equipment is connected to the outdoor exhaust equipment through the exhaust pipe; A control system is respectively connected to the AHU air conditioning system, the RTO hot fresh air system, the outdoor fresh air system and the exhaust system; Among them, 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 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 the static pressure layer above 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 according to claim 8, characterized in that: The RTO hot fresh air system further includes an RTO device and a hot fresh air manual air valve; the hot fresh air generated by the RTO device enters the air conditioning cabinet through the hot fresh air pipe and the first air inlet; the hot fresh air manual air valve is provided on the hot fresh air pipe and is located between the hot fresh air electric valve and the first air inlet; The outdoor fresh air system also includes a fresh air rainproof louver fan and a fresh air manual air valve; the fresh air rainproof louver fan is arranged at one end of the outdoor fresh air duct away from the air conditioning air cabinet, and the fresh air manual air valve is arranged on the outdoor fresh air duct and is located between the fresh air rainproof louver fan and the outdoor fresh air electric valve; a first pressure probe is also provided in the static pressure layer above the ceiling; the outdoor fresh air electric valve and the first pressure probe are both connected to the control system information.

10. The RTO hot fresh air waste heat recovery and recycling energy-saving device according to claim 9, characterized in that: The indoor exhaust equipment includes a first exhaust louver, a second exhaust louver, and a workshop exhaust fan, wherein the first exhaust louver and the workshop exhaust fan are both arranged 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; The outdoor exhaust equipment includes a static pressure layer exhaust fan, one end of the exhaust pipe extending from 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; an exhaust electric valve and an exhaust manual air valve are provided on the exhaust pipe, and the exhaust manual air valve is located between the exhaust electric valve and the static pressure layer exhaust fan; A first temperature probe is also provided in the static pressure layer above the ceiling, and the static pressure layer exhaust fan and the first temperature probe are both connected to the control system information.

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