Turbine fan heat recovery process and system

Abstract

The invention relates to the technical field of heat recovery, in particular to a turbine fan heat recovery process and system.The process comprises the steps that heat exhaust supply is conducted, specifically, hot air of a turbine fan enters a first heat exchange assembly and a second heat exchange assembly which are connected in series; heat exchange is conducted, specifically, heat exchange is conducted between media and hot air in the first heat exchange assembly and the second heat exchange assembly, the media are heated, and the hot air is cooled; medium temperature rise of the first heat exchange assembly and the second heat exchange assembly is detected in real time, and if the temperature is higher than a preset value, flow adjustment is conducted; and flow regulation, wherein the flow of hot air entering the first heat exchange assembly and the second heat exchange assembly is controlled or the flow of media entering the first heat exchange assembly and the second heat exchange assembly is controlled. According to the system, the heat exchange assembly is adopted to supply heat to a plurality of systems, the switching assembly is adopted to ensure that the important systems are preferentially supplied with heat, and the storage assembly is used to realize temporary storage of heat.

Description

Technical Field

[0001] This application relates to the field of heat recovery technology, and in particular to a heat recovery process and system for turbine fans. Background Technology

[0002] Water ring vacuum pumps use water as the working fluid, circulating it through pipelines. Multiple water ring vacuum pumps are typically used to construct a vacuum system to achieve different vacuum levels. However, this system requires a large number of pumps, resulting in high energy consumption and impacting the company's economic efficiency. A turbine blower will be used instead of the water ring vacuum pump to save energy, improve equipment efficiency, and achieve energy conservation and cost reduction. The turbine blower has a higher exhaust temperature, typically 120-180℃, and the heat can be recovered for heating the water tank and air system.

[0003] Currently, Chinese invention patent application with publication number CN113699819B and publication date of May 26, 2023, proposes a heat recovery system based on a turbine fan, which includes the following structure: a paper machine wet end and a turbine fan, the outlet of the turbine fan is connected to a heat exchange box, the heat exchange box is provided with an outlet for the turbine fan to extract the waste gas from the wet end, the outlet of the turbine fan is connected to the heat exchange box, and an air supply device is provided outside the heat exchange box to extract the air that has undergone heat exchange from inside the heat exchange box.

[0004] When the pulp is pumped out of water, the turbine blower creates negative pressure to pump out the water and generate a large amount of hot air. The turbine blower then draws the hot air into the connecting pipe. The hot air is then transported to the heat exchange box through the connecting pipe. The curved connection inside the heat exchange box heats the air inside. Finally, the hot air is blown out from the air outlet through the connecting pipe, utilizing the heat generated by the turbine blower.

[0005] Regarding the aforementioned technologies, when turbine fans generate a large amount of heat, efficient heat recovery cannot be achieved. In this case, the heat utilization rate can be improved by using a method that supplies heat to multiple systems. Summary of the Invention

[0006] This application provides a heat recovery process and system for turbine fans. By using heat exchange components, it can provide heat to multiple systems. By using switching components, it can ensure that important systems are given priority for heating. By using storage components, it can temporarily store heat and play a role in heat compensation during the start-up and shutdown phases of the turbine fans.

[0007] A turbine fan heat recovery process includes: Heat supply: The hot air from the turbine blower enters the first and second heat exchange components connected in series; Heat exchange: The medium in the first heat exchange component and the second heat exchange component exchange heat with the hot air, the medium heats up and the hot air cools down; Detection: Real-time detection of the medium temperature rise in the first heat exchange component and the second heat exchange component; if the temperature is higher than the preset value, the flow rate is adjusted. Flow regulation: Controlling the flow rate of the medium in the first heat exchange component and the second heat exchange component.

[0008] By adopting the above technical solution, the turbine fan generates a large amount of heat during operation. This heat first enters the first heat exchange component, where it exchanges heat with the medium inside. Then, the hot air enters the second heat exchange component, where it exchanges heat with the medium inside, and finally, it is discharged into the air. The first and second heat exchange components realize the heat exchange between the hot air and the medium. The medium is discharged after heating up, and the hot air is discharged after cooling down. During the heat exchange process, the temperature of the discharged medium is measured in real time. When the temperature of the medium is higher than a preset value, the flow rate of the medium in the first and second heat exchange components is controlled to reduce the temperature of the medium, so that the output medium meets the corresponding working requirements.

[0009] Optionally, temporary heat storage: when the temperature of the hot air is high and the temperature of the heated medium is higher than a preset value, part of the hot air from the turbine fan is introduced into the storage component to temporarily store the heat of the hot air.

[0010] By employing the above technical solution, the hot air from the turbine blower exchanges heat with the storage component, achieving temporary heat storage. When the temperature of the hot air discharged from the turbine blower is high, even after the medium absorbs sufficient heat, the temperature of the gas discharged from the heat exchange component remains high. If the heat cannot be recovered in a timely manner, it will result in heat waste. Therefore, a storage component is needed to achieve temporary heat storage.

[0011] Optionally, when it is necessary to ensure the temperature of a certain medium, a switching component is used to switch the order of hot gas flow to prioritize ensuring the temperature of a certain medium.

[0012] Since the flow sequence of hot air is constant after the equipment is installed, for example, the hot air first passes through the first heat exchange component and then enters the second heat exchange component, by adopting the above technical solution, the gas supply sequence can be flexibly changed so that the hot air enters the second heat exchange component first, and after passing through the switching component, it enters the first heat exchange component, thereby changing the heat exchange sequence and prioritizing the medium temperature of the second heat exchange component.

[0013] A turbine fan heat recovery system, comprising: The turbine fan, the hot air main pipe, the first heat exchange component, and the second heat exchange component; The main heat pipe includes a first main pipe; The first heat exchange assembly includes a first heat exchanger, a first medium inlet pipe, a first medium control valve, a first medium outlet pipe, a first medium temperature sensor, and a first exhaust pipe. One end of the first main pipe is connected to the turbine fan, and the other end is connected to the air inlet of the first heat exchanger. The air outlet of the first heat exchanger is connected to the first exhaust pipe. The first medium inlet pipe is connected to the medium inflow end of the first heat exchanger, and the medium outflow end of the first heat exchanger is connected to the first medium outlet pipe. The first medium control valve is installed on the first medium inlet pipe, and the first medium temperature sensor is installed on the first medium outlet pipe. The second heat exchange assembly includes a second heat exchanger, a second medium inlet pipe, a second medium control valve, a second medium outlet pipe, a second medium temperature sensor, a second air inlet pipe, and a second exhaust pipe. One end of the second air inlet pipe is connected to the first exhaust pipe, and the other end is connected to the air inlet end of the second heat exchanger. The air outlet end of the second heat exchanger is connected to the second exhaust pipe. The second medium inlet pipe is connected to the medium inflow end of the second heat exchanger, and the medium outflow end of the second heat exchanger is connected to the second medium outlet pipe. The second medium control valve is installed on the second medium inlet pipe, and the second medium temperature sensor is installed on the second medium outlet pipe.

[0014] By adopting the above technical solution, the turbine fan generates a large amount of hot air during operation. During normal operation, the first and second medium control valves are opened to allow the medium to enter the heat exchanger. The hot air enters the first heat exchange component through the first main pipe. Simultaneously, the first medium enters the first heat exchanger through the first medium inlet pipe, where the hot air exchanges heat with the first medium. The first medium is then discharged through the first medium outlet pipe. Then, the hot air enters the second heat exchanger through the first exhaust pipe and the second inlet pipe. Simultaneously, the second medium enters the second heat exchanger through the second medium inlet pipe, where the hot air exchanges heat with the second medium. The second medium is then discharged through the second medium outlet pipe. This achieves heat exchange between the first and second media and the hot air, enabling heating for multiple systems and improving heat utilization. When the temperature of the first medium detected by the first medium temperature sensor exceeds a preset value, the temperature of the output first medium is regulated by increasing the flow rate of the first medium through the first medium control valve. Similarly, when the temperature of the second medium detected by the second medium temperature sensor exceeds a preset value, the temperature of the output second medium is regulated by increasing the flow rate of the second medium through the second medium control valve. Ensure that the temperature of the output medium meets the operating requirements.

[0015] Optionally, it also includes an intermediate housing, the first exhaust pipe is connected to the air inlet of the intermediate housing, the air outlet of the intermediate housing is connected to the second air inlet pipe, the hot air main pipe also includes a second main pipe and a second main pipe control valve, the second main pipe is connected to the first main pipe and the air inlet of the intermediate housing, and the second main pipe control valve is disposed on the second main pipe.

[0016] By adopting the above technical solution, the second main pipe control valve is opened, and hot gas enters the intermediate chamber after passing through the first main pipe and then the second main pipe. During the temperature adjustment of the first medium, less hot gas enters the second heat exchanger, affecting heat exchange with the second medium. By adding a second main pipe and controlling the flow rate through its control valve, the heat output can be increased to ensure the heating requirements of the second medium are met.

[0017] Optionally, the switching assembly includes a third main pipe, a third main pipe control valve, a switching intermediate pipe, a switching intermediate pipe control valve, a switching post-supply pipe, a switching post-supply pipe control valve, a switching exhaust pipe, a switching exhaust pipe control valve, a first exhaust pipe control valve, a second intake pipe control valve, a second exhaust pipe control valve, and a post-main pipe control valve. One end of the third main pipe is connected to the first main pipe, and the other end is connected to the intake end of the second heat exchanger. The third main pipe control valve is located on the third main pipe. One end of the switching intermediate pipe is connected to the exhaust end of the second heat exchanger, and the other end is connected to the intake end of the intermediate housing. A control valve is installed on the switching intermediate pipe. One end of the switched gas supply pipe is connected to the gas outlet of the intermediate housing, and the other end is connected to the gas inlet of the first heat exchanger. A control valve for the switched gas supply pipe is installed on the switched gas supply pipe. The switched exhaust pipe is connected to the first exhaust pipe. A control valve for the switched exhaust pipe is installed on the switched exhaust pipe. A control valve for the first exhaust pipe is installed on the first exhaust pipe. A control valve for the second intake pipe is installed on the second intake pipe. A control valve for the second exhaust pipe is installed on the second intake pipe. A control valve for the rear main pipe is installed on the first main pipe.

[0018] By adopting the above technical solution, the main control valve, the first exhaust pipe control valve, the second intake pipe control valve, and the second exhaust pipe control valve are closed, while the third main control valve, the switching intermediate pipe control valve, the switching post-supply pipe control valve, and the switching exhaust pipe control valve are opened. Hot air from the first main pipe enters the third main pipe, then enters the second heat exchanger to exchange heat with the second medium. From the second heat exchanger, it enters the intermediate housing via the switching intermediate pipe, then enters the switching post-supply pipe, and finally enters the first heat exchanger to exchange heat with the first medium. The hot air is then discharged through the first exhaust pipe and the switching exhaust pipe. This flexible change in the gas supply sequence allows hot air to preferentially enter the second heat exchange component before entering the first heat exchange component, thus altering the heat exchange sequence and prioritizing the temperature of the second medium.

[0019] Optionally, the storage component includes a storage box, a storage air inlet pipe, a storage air inlet pipe control valve, and a storage exhaust pipe. One end of the storage air inlet pipe is connected to the main pipe, and the other end is connected to the air inlet end of the storage box. The air outlet end of the storage box is connected to the storage exhaust pipe, and the storage air inlet pipe control valve is disposed on the storage air inlet pipe.

[0020] By adopting the above technical solution, the storage inlet pipe control valve is opened, and hot air enters the storage tank through the main pipe and storage inlet pipe, where it exchanges heat with the storage medium inside. Then, the hot air is discharged through the storage exhaust pipe. After the medium absorbs sufficient heat, the temperature of the gas discharged from the heat exchange components is still relatively high. At this time, the heat is recovered in a timely manner through the storage medium inside the storage tank, reducing heat waste.

[0021] Optionally, the storage component further includes a storage exhaust pipe control valve, a storage heating pipe, and a storage heating pipe control valve. The storage exhaust pipe control valve is disposed on the storage exhaust pipe, and the storage heating pipe control valve is disposed on the storage heating pipe. One end of the storage heating pipe is connected to the hot gas through the storage exhaust pipe, and the other end is connected to the first main pipe. The hot gas main pipe further includes a front main pipe control valve, which is disposed on the first main pipe.

[0022] By adopting the above technical solution, in the initial stage of turbine fan operation, the exhaust temperature is relatively low. The main control valve and storage exhaust pipe control valve are closed, and the storage inlet pipe control valve and storage heating pipe control valve are opened, so that the hot air enters the storage tank through the storage inlet pipe and exchanges heat with the internal storage medium to heat the hot air. The hot air then re-enters the first main pipe through the storage heating pipe, realizing the utilization of stored heat and improving the heat utilization rate.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention maximizes heat utilization by connecting a first heat exchange component and a second heat exchange component in series. By real-time monitoring of the medium temperature, if the temperature exceeds a preset value, the temperature can be adjusted by controlling the medium flow rate. During sequential heating, controlling the hot air flow rate may result in insufficient hot air supply to the second heat exchange component. Adding a second main pipe increases the hot air input to ensure the heating requirements of the second medium are met. 2. This invention employs a storage component. Hot gas enters the storage tank through the main pipe and storage inlet pipe, where it exchanges heat with the internal storage medium. The hot gas is then discharged through the storage exhaust pipe. After the medium absorbs sufficient heat, the temperature of the gas discharged from the heat exchange component remains high. At this point, the heat is promptly recovered through the storage medium inside the storage tank, reducing heat waste. 3. When the priority of the second medium is higher than that of the first medium, the present invention uses a switching component to change the gas supply sequence, so that the hot gas enters the second heat exchange component first and then enters the first heat exchange component, thereby changing the heat exchange sequence and prioritizing the temperature of the second medium. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure in the embodiments of this application. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the first heat exchange component in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the second heat exchange component in the embodiments of this application; Figure 5 This is a schematic diagram of the intermediate box and switching component structure in the embodiments of this application.

[0025] Figure label: 100. Turbine blower; 200. Storage component; 210. Storage box; 220. Storage exhaust pipe; 221. Storage exhaust pipe control valve; 230. Storage air inlet pipe; 231. Storage air inlet pipe control valve; 240. Storage heating pipe; 241. Storage heating pipe control valve; 300, First heat exchange assembly; 310, First medium control valve; 320, First medium inlet pipe; 330, First heat exchanger; 340, First medium outlet pipe; 341, First medium temperature sensor; 350, First exhaust pipe; 400. Intermediate box; 500, Second heat exchange assembly; 510, Second medium control valve; 520, Second medium inlet pipe; 530, Second heat exchanger; 540, Second air inlet pipe; 550, Second medium outlet pipe; 551, Second medium temperature sensor; 560, Second exhaust pipe; 600. Switching component; 610. Third main pipe; 611. Third main pipe control valve; 620. Switching intermediate pipe; 621. Switching intermediate pipe control valve; 630. Switching rear air supply pipe; 631. Switching rear air supply pipe control valve; 640. Switching exhaust pipe; 641. Switching exhaust pipe control valve; 650. First exhaust pipe control valve; 660. Second intake pipe control valve; 670. Second exhaust pipe control valve; 680. Rear main pipe control valve; 700, Hot gas main pipe; 710, First main pipe; 711, Front main pipe control valve; 720, Second main pipe; 721, Second main pipe control valve; 800. Medium outlet pipe switch valve; 900. Condensate drain valve. Detailed Implementation

[0026] The following combination Figures 1 to 5 This application will be described in further detail.

[0027] Example 1: This example provides a turbine fan heat recovery process including exhaust heat supply, heat exchange, detection, flow regulation, temporary heat storage, and component switching. First, the hot air discharged from the turbine fan 100 is input into a first heat exchange component 300 and a second heat exchange component 500 connected in series, exchanging heat with a first medium and a second medium. The temperature of the heated first and second media is detected in real time. When the temperature is higher than a preset value, the hot air flow rate or the medium flow rate of the first heat exchange component 300 and the second heat exchange component 500 is adjusted to bring the medium to the preset temperature. Adjusting the hot air may cause a decrease in the temperature of the medium in subsequent heat exchange components. This can be compensated by directly inputting hot air to increase the temperature of the subsequent medium. Furthermore, if the second medium has a higher priority, the heating sequence of the first heat exchange component 300 and the second heat exchange component 500 is switched to prioritize maintaining the temperature of the second medium. When both media are at high temperatures, heat can be temporarily stored by introducing some of the hot air into the storage component 200. During the start-up and shutdown phase of the turbine fan 100, when the hot air temperature is low, the temporarily stored heat can be used to heat the hot air to achieve heat compensation, thereby maximizing heat recovery and utilization.

[0028] A turbine fan heat recovery process includes: Component switching: For example, when prioritizing the first medium, a sequential gas supply method is used. When the second medium has a higher priority, the switching component 600 is used to switch the order of hot gas flow to prioritize the temperature of the second medium.

[0029] Heat supply: During sequential air supply, the hot air from the turbine fan 100 enters the first heat exchange component 300 and the second heat exchange component 500 connected in series; when switching the air supply sequence, the hot air from the turbine fan 100 first enters the second heat exchange component 500 and then enters the first heat exchange component 300. By adopting a series heating method, the maximum utilization of heat is achieved.

[0030] Heat exchange: The medium in the first heat exchange component 300 and the second heat exchange component 500 exchanges heat with the hot air. For example, the first medium is water and the second medium is air. The medium heats up and the hot air cools down.

[0031] Detection: Real-time detection of the medium temperature rise in the first heat exchange component 300 and the second heat exchange component 500. If the temperature is higher than the preset value, the flow rate is adjusted. If the temperature of both is higher than the preset value, the heat is temporarily stored.

[0032] Flow regulation: Control the flow rate of the medium in the first heat exchange component 300 and the second heat exchange component 500 so that the medium can exchange heat with the hot air and achieve the desired output temperature of the medium.

[0033] Temporary heat storage: When the temperature of the hot air is high and the temperature of the heated medium is higher than the preset value, part of the hot air from the turbine fan 100 is passed into the storage component 200 to temporarily store the heat of the hot air and reduce heat waste. At the beginning stage of the turbine fan 100, the hot air passes through the storage component 200 first, which plays a role in compensating for the heat of the hot air.

[0034] refer to Figure 1A turbine fan heat recovery system includes: a turbine fan 100, a hot gas main pipe 700, a first heat exchange component 300, an intermediate housing 400, a second heat exchange component 500, a storage component 200, and a switching component 600. The turbine fan 100 is connected to the storage component 200, the first heat exchange component 300, the second heat exchange component 500, the intermediate housing 400, and the switching component 600 via the hot gas main pipe 700. The first heat exchange component 300 and the second heat exchange component 500 are connected via the intermediate housing 400 and the switching component 600. When hot gas is input from the hot gas main pipe 700 to the storage component 200, temporary heat storage is achieved. During the initial stage of the turbine fan 100, heat compensation is achieved when hot gas passes through the storage component 200. The hot gas then enters the first heat exchange component 300 and the second heat exchange component 500, enabling heat exchange between the hot gas and the medium, thus heating the medium. When the second medium has a higher priority, the gas supply sequence is changed by switching component 600, so that hot gas first enters the second heat exchange component 500 and then the first heat exchange component 300. In this way, heat recovery is maximized and heat utilization is improved.

[0035] refer to Figure 2 The hot air main pipe 700 includes a first main pipe 710, a front main pipe control valve 711, a second main pipe 720, and a second main pipe control valve 721. One end of the first main pipe 710 is connected to the turbine fan 100, and the other end is connected to the first heat exchange assembly 300. The front main pipe control valve 711 is installed on the first main pipe 710. One end of the second main pipe 720 is connected to the first main pipe 710, and the other end is connected to the intermediate housing 400. The second main pipe control valve 721 is installed on the second main pipe 720. Hot air from the turbine fan 100 first enters the main pipe 710 and then enters the first heat exchange assembly 300, thus supplying heat to the first heat exchange assembly 300. When the second main pipe control valve 721 is opened, hot air enters the second heat exchange assembly 500 via the second main pipe 720 and the intermediate housing 400, thus compensating for the heat loss in the second heat exchange assembly 500.

[0036] refer to Figure 2The storage assembly 200 includes a storage tank 210, a storage air inlet pipe 230, a storage air inlet pipe control valve 231, a storage exhaust pipe 220, a storage exhaust pipe control valve 221, a storage heating pipe 240, and a storage heating pipe control valve 241. One end of the storage air inlet pipe 230 is connected to the main pipe 710, and the other end is connected to the air inlet end of the storage tank 210. The air outlet end of the storage tank 210 is connected to the storage exhaust pipe 220. The storage air inlet pipe control valve 231 is installed on the storage air inlet pipe 230. The storage exhaust pipe control valve 221 is installed on the storage exhaust pipe 220. The storage heating pipe control valve 241 is installed on the storage heating pipe 240. One end of the storage heating pipe 240 is connected to the hot air via the storage exhaust pipe 220, and the other end is connected to the first main pipe 710. Opening the storage inlet pipe control valve 231 and the storage outlet pipe control valve 221 allows hot air to enter the storage tank 210 from the first main pipe 710 via the storage inlet pipe 230, where it exchanges heat with the internal storage medium. The hot air then exits through the storage outlet pipe 220. After the medium absorbs sufficient heat, the temperature of the gas exiting the heat exchange components remains high. At this point, the heat is promptly recovered through the storage medium within the storage tank 210, reducing heat waste. In the initial stage of turbine fan 100 operation, its exhaust temperature is low. Closing the front main pipe control valve 711 and the storage outlet pipe control valve 221, and opening the storage inlet pipe control valve 231 and the storage heating pipe control valve 241 allows hot air to enter the storage tank 210 via the storage inlet pipe 230, where it exchanges heat with the internal storage medium, heating the hot air. The hot air then re-enters the first main pipe 710 through the storage heating pipe 240, thus utilizing the stored heat and improving heat utilization efficiency.

[0037] refer to Figure 3The first heat exchange assembly 300 includes a first heat exchanger 330, a first medium inlet pipe 320, a first medium control valve 310, a first medium outlet pipe 340, a first medium temperature sensor 341, and a first exhaust pipe 350. The other end of the first main pipe 710 is connected to the air inlet end of the first heat exchanger 330, the air outlet end of the first heat exchanger 330 is connected to the first exhaust pipe 350, the first exhaust pipe 350 is connected to the air inlet end of the intermediate housing 400, the first medium inlet pipe 320 is connected to the medium inflow end of the first heat exchanger 330, the medium outflow end of the first heat exchanger 330 is connected to the first medium outlet pipe 340, the first medium control valve 310 is installed on the first medium inlet pipe 320, and the first medium temperature sensor 341 is installed on the first medium outlet pipe 340. Hot gas enters the first heat exchanger 330 through the first main pipe 720. The first medium enters the first heat exchanger 330 through the first medium control valve 310 and the first medium inlet pipe 320. The hot gas and the first medium exchange heat, the first medium heats up, the hot gas cools down for the first time, the first medium is discharged through the first medium outlet pipe 340, and the hot gas is discharged to the intermediate box 400 through the first exhaust pipe 350. When the temperature of the first medium detected by the first medium temperature sensor 341 exceeds the preset value, the temperature of the output first medium is regulated by increasing the flow rate of the first medium through the control valve 310.

[0038] refer to Figure 4The second heat exchange assembly 500 includes a second heat exchanger 530, a second medium inlet pipe 520, a second medium control valve 510, a second medium outlet pipe 550, a second medium temperature sensor 551, a second air inlet pipe 540, and a second exhaust pipe 560. One end of the second air inlet pipe 540 is connected to the air outlet of the intermediate housing 400, and the other end is connected to the air inlet of the second heat exchanger 530. The air outlet of the second heat exchanger 530 is connected to the second exhaust pipe 560. The second medium inlet pipe 520 is connected to the medium inflow end of the second heat exchanger 530, and the medium outflow end of the second heat exchanger 530 is connected to the second medium outlet pipe 550. The second medium control valve 510 is installed on the second medium inlet pipe 520, and the second medium temperature sensor 551 is installed on the second medium outlet pipe 550. Hot air from the intermediate housing 400 enters the second heat exchanger 530 through the second inlet pipe 540. The hot air exchanges heat with the second medium, causing the second medium to heat up. The hot air then cools down a second time. The second medium is discharged through the second medium outlet pipe 550, and the hot air is discharged through the second exhaust pipe 560. When the temperature of the second medium detected by the second medium temperature sensor 551 exceeds a preset value, the temperature of the output second medium is regulated by increasing the flow rate of the second medium through the second medium control valve 510. During the temperature adjustment of the first medium, less hot air enters the second heat exchanger 530, affecting heat exchange with the second medium. By adding a second main pipe 720 and controlling the flow rate through the second main pipe control valve 721, the hot air mixes with the first-cooled hot air within the intermediate housing 400, increasing the heat output and ensuring the heating requirements of the second medium are met.

[0039] refer to Figure 5The switching assembly 600 includes a third main pipe 610, a third main pipe control valve 611, a switching intermediate pipe 620, a switching intermediate pipe control valve 621, a switching post-supply pipe 630, a switching post-supply pipe control valve 631, a switching exhaust pipe 640, a switching exhaust pipe control valve 641, a first exhaust pipe control valve 650, a second intake pipe control valve 660, a second exhaust pipe control valve 670, and a post-main pipe control valve 680. One end of the third main pipe 610 is connected to the first main pipe 710, and the other end is connected to the intake end of the second heat exchanger 530. The third main pipe control valve 611 is installed on the third main pipe 610. One end of the switching intermediate pipe 620 is connected to the outlet end of the second heat exchanger 530, and the other end is connected to the intake end of the intermediate housing 400. A control valve 621 is installed on the switching intermediate pipe 620. One end of the switched air supply pipe 630 is connected to the air outlet of the intermediate housing 400, and the other end is connected to the air inlet of the first heat exchanger 330. The control valve 631 of the switched air supply pipe is installed on the switched air supply pipe 630. The switched exhaust pipe 640 is connected to the first exhaust pipe 350. The control valve 641 of the switched exhaust pipe is installed on the switched exhaust pipe 640. The control valve 650 of the first exhaust pipe is installed on the first exhaust pipe 350. The control valve 660 of the second intake pipe is installed on the second intake pipe 540. The control valve 670 of the second exhaust pipe is installed on the second intake pipe 560. The control valve 680 of the rear main pipe is installed on the first main pipe 720. After closing the main control valve 680, first exhaust pipe control valve 650, second intake pipe control valve 660, and second exhaust pipe control valve 670, open the third main control valve 611, switching intermediate pipe control valve 621, switching post-supply pipe control valve 631, and switching exhaust pipe control valve 641. Hot air from the first main pipe 710 enters the third main pipe 610, then the second heat exchanger 530, where it exchanges heat with the second medium. From the second heat exchanger 530, it enters the switching intermediate pipe 620, then the intermediate housing 400, then the switching post-supply pipe 630, and finally the first heat exchanger 330, where it exchanges heat with the first medium. The hot air is then discharged through the first exhaust pipe 350 and the switching exhaust pipe 640. This flexible change in the gas supply sequence allows hot air to preferentially enter the second heat exchange assembly 500 before entering the first heat exchange assembly 300, thus altering the heat exchange sequence and prioritizing the temperature of the second medium.

[0040] refer to Figure 3 A medium outlet valve 800 is installed on the first medium outlet pipe 350 and the second medium outlet pipe 550. By controlling the medium outlet valve 800, the residence time of the medium in the heat exchanger in the initial stage is controlled, which facilitates the heating of the medium.

[0041] refer to Figure 5The first heat exchanger 340, the intermediate housing 400, and the second heat exchanger 530 are equipped with condensate drain valves 900. Condensation is generated during heat exchange, and the condensate drain valves 900 facilitate the drainage of condensate.

[0042] The working principle of this embodiment is as follows: S1: Priority judgment: Determine whether the priority of the second medium is greater than that of the first medium. If it is greater, execute S2; otherwise, execute S3. S2: Reverse gas supply: Close the main control valve 680, the first exhaust pipe control valve 650, the second intake pipe control valve 660, and the second exhaust pipe control valve 670. Open the third main control valve 611, the switching intermediate pipe control valve 621, the switching post-supply pipe control valve 631, and the switching exhaust pipe control valve 641. The hot gas in the first main pipe 710 enters the third main pipe 610, then enters the second heat exchanger 530 to exchange heat with the second medium. From the second heat exchanger 530, it enters the switching intermediate pipe 620, then enters the intermediate housing 410, then enters the switching post-supply pipe 630, and then enters the first heat exchanger 330 to exchange heat with the first medium. The hot gas is discharged through the first exhaust pipe 350 and the switching exhaust pipe 640. S3: Sequential gas supply: Close the third main pipe control valve 611, switch the intermediate pipe control valve 621, switch the rear gas supply pipe control valve 631 and switch the exhaust pipe control valve 641, open the rear main pipe control valve 680, the first exhaust pipe control valve 650, the second intake pipe control valve 660 and the second exhaust pipe control valve 670, hot gas enters the first heat exchanger 330 from the first main pipe 710, and the hot gas exchanges heat with the first medium. After the hot gas cools down for the first time, it enters the intermediate box 400 through the first exhaust pipe 350 to achieve temporary gas storage. The hot gas in the intermediate box 400 enters the second heat exchanger 530 through the second intake pipe 540, and the hot gas exchanges heat with the second medium. The second medium heats up, the hot gas cools down for the second time, the second medium is discharged from the second medium outlet pipe 550, and the hot gas is discharged from the second exhaust pipe 560. S4: Temperature detection: Detect the temperature of the first medium and the second medium. If the temperature of both is too high, execute S5; if the temperature is too high, execute S6. S5: Temporary heat storage: Open the storage inlet pipe control valve 231 and the storage outlet pipe control valve 221. Hot air enters the storage box 210 from the first main pipe 710 through the storage inlet pipe 230 and exchanges heat with the storage medium inside. Then the hot air is discharged through the storage outlet pipe 220. The heat is recovered in time through the storage medium inside the storage box 210 to reduce heat waste. In the initial stage of turbine blower 100 operation, its exhaust temperature is low. Close the main pipe control valve 711 and the storage exhaust pipe control valve 221, and open the storage inlet pipe control valve 231 and the storage heating pipe control valve 241. This allows hot air to enter the storage tank 210 through the storage inlet pipe 230 and exchange heat with the internal storage medium to heat the hot air. The hot air then re-enters the first main pipe 710 through the storage heating pipe 240, thereby utilizing the stored heat and improving the heat utilization rate. S6: Flow control: Control the flow rate of the medium in the first heat exchange component 300 and the second heat exchange component 500 so that the medium can exchange heat with the hot gas and achieve the desired output temperature of the medium. S61: When supplying gas in sequence: When the temperature of the first medium is adjusted, less hot gas will enter the second heat exchanger 530, affecting the heat exchange with the second medium. By adding a second main pipe 720 and controlling the flow through the second main pipe control valve 721, the hot gas can be mixed with the hot gas after the first cooling in the intermediate box 400, which can increase the heat and ensure the heating requirements of the second medium. S62: Reverse gas supply: When the temperature of the second medium is adjusted, the hot gas flow rate is reduced by adjusting the third main pipe control valve 611, which will result in less hot gas entering the first heat exchanger 330, affecting the heat exchange with the first medium. By controlling the flow rate through the rear main pipe control valve 680, the hot gas and the hot gas after the first cooling are input into the first heat exchanger 330 to ensure the heating requirements of the first medium.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A turbofan heat recovery process, characterized by: Comprising: Heat supply: hot gas of turbine fan (100) enters first heat exchange assembly (300) and second heat exchange assembly (500) in series; Heat exchange: medium in the first heat exchange assembly (300) and the second heat exchange assembly (500) exchanges heat with hot gas, medium is heated, and hot gas is cooled; Detection: real-time detection of medium heating in the first heat exchange assembly (300) and the second heat exchange assembly (500), if the temperature is higher than the preset value, flow regulation is carried out; Flow regulation: control the medium flow of the first heat exchange assembly (300) and the second heat exchange assembly (500).

2. The turbofan heat recovery process of claim 1, wherein: Temporary heat storage: when the hot gas temperature is high and the medium temperature after heating is higher than the preset value, part of the hot gas of the turbine fan (100) is introduced into the storage assembly (200) to realize temporary storage of the heat of the hot gas.

3. The turbofan heat recovery process of claim 2, wherein: Component switching: when it is necessary to ensure the temperature of a certain medium, switching assembly (600) is used to switch the sequence of hot gas flow to preferentially ensure the temperature of a certain medium.

4. A turbofan heat recovery system characterized by, A recovery process for performing any one of claims 1-3, comprising: The turbine fan (100), the hot gas main pipe (700), the first heat exchange assembly (300) and the second heat exchange assembly (500); The hot gas main pipe (700) comprises a first main pipe (710); The first heat exchange assembly (300) comprises a first heat exchanger (330), a first medium inlet pipe (320), a first medium control valve (310), a first medium outlet pipe (340), a first medium temperature sensor (341) and a first exhaust pipe (350), one end of the first main pipe (710) is communicated with the turbine fan (100), the other end is communicated with the gas inlet end of the first heat exchanger (330), the gas outlet end of the first heat exchanger (330) is communicated with the first exhaust pipe (350), the first medium inlet pipe (320) is communicated with the medium inflow end of the first heat exchanger (330), the medium outflow end of the first heat exchanger (330) is communicated with the first medium outlet pipe (340), the first medium control valve (310) is arranged on the first medium inlet pipe (320), and the first medium temperature sensor (341) is arranged on the first medium outlet pipe (340); The second heat exchange component (500) comprises a second heat exchanger (530), a second medium inlet pipe (520), a second medium control valve (510), a second medium outlet pipe (550), a second medium temperature sensor (551), a second air inlet pipe (540) and a second air outlet pipe (560), one end of the second air inlet pipe (540) is communicated with the first air outlet pipe (350), the other end is communicated with an air inlet end of the second heat exchanger (530), an air outlet end of the second heat exchanger (530) is communicated with the second air outlet pipe (560); the second medium inlet pipe (520) is communicated with a medium inflow end of the second heat exchanger (530), a medium outflow end of the second heat exchanger (530) is communicated with the second medium outlet pipe (550), the second medium control valve (510) is arranged on the second medium inlet pipe (520), and the second medium temperature sensor (551) is arranged on the second medium outlet pipe (550).

5. The turbofan heat recovery system of claim 4, wherein: Further comprising an intermediate box (400), the first air outlet pipe (350) is communicated with an air inlet end of the intermediate box (400), an air outlet end of the intermediate box (400) is communicated with the second air inlet pipe (540), the hot gas main pipe (700) further comprises a second main pipe (720) and a second main pipe control valve (721), the second main pipe (720) is communicated with the first main pipe (710) and the air inlet end of the intermediate box (410), and the second main pipe control valve (721) is arranged on the second main pipe (720).

6. The turbofan heat recovery system of claim 5, wherein: The switching assembly (600) includes a third main pipe (610), a third main pipe control valve (611), a switching intermediate pipe (620), a switching intermediate pipe control valve (621), a switching post-supply pipe (630), a switching post-supply pipe control valve (631), a switching exhaust pipe (640), a switching exhaust pipe control valve (641), a first exhaust pipe control valve (650), a second intake pipe control valve (660), a second exhaust pipe control valve (670), and a post-main pipe control valve (680). One end of the third main pipe (610) is connected to the first main pipe (710), and the other end is connected to the intake end of the second heat exchanger (530). The third main pipe control valve (611) is located on the third main pipe (610). One end of the switching intermediate pipe (620) is connected to the outlet end of the second heat exchanger (530), and the other end is connected to the intake end of the intermediate housing (400). The intermediate pipe control valve (621) is installed on the intermediate switching pipe (620). One end of the switched gas supply pipe (630) is connected to the outlet of the intermediate box (400), and the other end is connected to the inlet of the first heat exchanger (330). The switched gas supply pipe control valve (631) is installed on the switched gas supply pipe (630). The switched exhaust pipe (640) is connected to the first exhaust pipe (350). The switched exhaust pipe control valve (641) is installed on the switched exhaust pipe (640). The first exhaust pipe control valve (650) is installed on the first exhaust pipe (350). The second intake pipe control valve (660) is installed on the second intake pipe (540). The second exhaust pipe control valve (670) is installed on the second intake pipe (560). The rear main pipe control valve (680) is installed on the first main pipe (720).

7. The turbofan heat recovery system of claim 4, wherein: The storage component (200) includes a storage box (210), a storage air inlet pipe (230), a storage air inlet pipe control valve (231), and a storage exhaust pipe (220). One end of the storage air inlet pipe (230) is connected to the main pipe (710), and the other end is connected to the air inlet end of the storage box (210). The air outlet end of the storage box (210) is connected to the storage exhaust pipe (220). The storage air inlet pipe control valve (231) is disposed on the storage air inlet pipe (230).

8. The turbofan heat recovery system of claim 7, wherein: The storage component (200) further includes a storage exhaust pipe control valve (221), a storage heating pipe (240), and a storage heating pipe control valve (241). The storage exhaust pipe control valve (221) is disposed on the storage exhaust pipe (220), and the storage heating pipe control valve (241) is disposed on the storage heating pipe (240). One end of the storage heating pipe (240) is connected to the hot gas through the storage exhaust pipe (220), and the other end is connected to the first main pipe (710). The hot gas main pipe (700) further includes a front main pipe control valve (711), which is disposed on the first main pipe (710).

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