Deaerator waste heat recovery device

Abstract

This application provides a waste heat recovery device for a deaerator, comprising: a deaerator, a waste steam pipeline, and a shell-and-tube heat exchanger. The top of the deaerator is connected to the waste steam pipeline, which is equipped with a three-way valve. The three-way valve has one inlet and two outlets. The inlet of the three-way valve is connected to the outlet of the waste steam pipeline, one outlet of the three-way valve is connected to a waste steam direct discharge pipe, and the other outlet of the three-way valve is connected to the heat exchange medium inlet of the shell-and-tube heat exchanger via a waste steam bypass. A demineralized water inlet pipe is connected to the tube-side inlet end of the shell-and-tube heat exchanger, and a demineralized water outlet pipe is connected to the tube-side outlet end of the shell-and-tube heat exchanger. The demineralized water outlet pipe is connected to the inlet of the deaerator. A condensate outlet pipe is connected to the side wall of the shell-and-tube heat exchanger, and the outlet end of the condensate outlet pipe is connected to a low-level water tank. This application improves the efficiency of waste steam heat recovery and working fluid recovery.

Description

Technical Field

[0001] This application relates to waste heat recovery and utilization equipment technology, and more particularly to a waste heat recovery device for a deaerator. Background Technology

[0002] Currently, most thermal power plant boiler feedwater deoxygenation methods utilize steam heating for thermal deoxygenation, with the deoxygenated oxygen-rich gas vented from the top of the deaerator. This method is simple, reliable, and effective, but it also results in a significant amount (approximately 10%) of the steam-liquid mixture being discharged from the top of the deaerator via the exhaust pipe, leading to energy waste and environmental pollution. This exhaust gas contains a large amount of clean steam at temperatures exceeding 100°C, resulting in the waste of substantial heat energy and qualified demineralized water, and causing "white dragon" pollution within the plant area. Therefore, boiler deaerator exhaust steam represents a significant waste heat resource, and its recovery is crucial and necessary given my country's strong emphasis on energy conservation and emission reduction policies. Simultaneously, non-condensable gases carrying large amounts of low-pressure steam are emitted from the deaerator into the atmosphere, generating significant noise pollution and wasting heat and water resources. Utility Model Content

[0003] This application provides a waste heat recovery device for a deaerator to solve the problems mentioned in the background art.

[0004] This application provides a waste heat recovery device for a deaerator, comprising: a deaerator, a waste steam pipeline, and a shell-and-tube heat exchanger.

[0005] The top of the deaerator is connected to a waste steam pipe, and a three-way valve is installed on the waste steam pipe. The three-way valve has one inlet and two outlets. The inlet of the three-way valve is connected to the outlet of the waste steam pipe, one outlet of the three-way valve is connected to the waste steam direct discharge pipe, and the other outlet of the three-way valve is connected to the heat exchange medium inlet of the shell-and-tube heat exchanger through the waste steam bypass.

[0006] The shell-and-tube heat exchanger has a demineralized water inlet pipe connected to the tube side inlet and a demineralized water outlet pipe connected to the tube side outlet. The demineralized water outlet pipe is connected to the inlet of the deaerator. A condensate outlet pipe is connected to the side wall of the shell-and-tube heat exchanger, and the outlet of the condensate outlet pipe is connected to a low-level water tank.

[0007] Optionally, the shell-and-tube heat exchanger is provided with multiple heat exchange tubes and baffles inside. The baffles are located at both ends inside the shell-and-tube heat exchanger, and the multiple heat exchange tubes are distributed in parallel through the baffles.

[0008] Multiple heat exchange tubes are provided with multiple fins at equal intervals on their outer periphery, with the fins tilted at an angle of 30-60° to the vertical direction.

[0009] Optionally, the fins on adjacent heat exchange tubes can be staggered.

[0010] Optionally, the top of the shell-and-tube heat exchanger is equipped with a non-condensable gas vent valve and a pressure sensor.

[0011] Optionally, a liquid phase vent valve may be provided at the tube-side outlet end of the shell-and-tube heat exchanger.

[0012] Optionally, a steam trap is installed on the condensate outlet pipe, and a first valve is installed before and after the steam trap on both sides of the condensate outlet pipe.

[0013] Optionally, a condensate bypass pipe is provided at both ends of the two first valves on the condensate output pipe, and a second valve is provided on the condensate bypass pipe.

[0014] Optionally, a demineralized water inlet pipeline and a demineralized water outlet pipeline are connected in parallel, and a third valve is installed on the demineralized water bypass pipeline.

[0015] Optionally, the low-level water tank is equipped with a water quality monitor and a level gauge. The low-level water tank is connected to the deaerator through a condensate return water pipeline. A return water valve is installed on the condensate return water pipeline. The low-level water tank is also equipped with a fourth valve.

[0016] Optionally, the waste heat recovery device is also equipped with a controller, which is connected to a three-way valve, a non-condensable gas exhaust valve, a pressure sensor, a liquid phase exhaust valve, a first valve, a second valve, a third valve, a water quality monitor, a level gauge, a return water valve, and a fourth valve.

[0017] The deaerator waste heat recovery device provided in this application realizes the recovery of waste heat from exhaust steam in the deaerator, and has the following advantages compared with the prior art:

[0018] (1) This application achieves the recovery of waste heat from the exhaust steam in the deaerator through the above-mentioned scheme. By setting up a shell-and-tube heat exchanger, the exhaust steam in the deaerator is transported to the shell-and-tube heat exchanger. The exhaust steam and demineralized water exchange heat in the shell-and-tube heat exchanger, and the exhaust steam is condensed into water, which is output through the condensate output pipe and collected in the low-level water tank, realizing the recycling of water resources. At the same time, the heated demineralized water is transported to the deaerator for deoxygenation through the demineralized water output pipeline. In this application, by inputting the exhaust steam into the shell-and-tube heat exchanger to preheat the demineralized water before inputting it into the deaerator, it not only increases the inlet water temperature of the deaerator, reduces the heat use in the deaerator, reduces heat loss, saves low-pressure steam, and reduces the production cost of the enterprise, but also pre-deoxygenates the demineralized water, improving the deoxygenation efficiency of the deaerator for the demineralized water. At the same time, the condensate obtained after the exhaust steam is condensed is recovered in the low-level water tank, realizing the full utilization of energy and improving the economic benefits of the enterprise. At the same time, it can reduce noise generation, reuse the recovered heat energy in the production system, and reduce thermal pollution. It meets the requirements of current national energy conservation, emission reduction and environmental protection policies, and has significant environmental benefits.

[0019] (2) In a shell-and-tube heat exchanger, multiple heat exchange tubes are distributed in parallel through a baffle, allowing the exhaust steam to flow through the shell side and the demineralized water to flow through the tube side, thus achieving heat recovery from the exhaust steam and recovery of the working fluid. Fins are installed on the outer periphery of the heat exchange tubes, which can improve the heat exchange efficiency between the exhaust steam and the demineralized water, thereby improving the heat recovery efficiency. At the same time, the multiple fins are arranged at an angle, which not only facilitates installation, but also helps the condensate to fall onto the lower fins during the heat exchange process, extending the heat exchange time and improving the heat exchange efficiency.

[0020] (3) In the heat exchange process, the shell-and-tube heat exchanger of this application uses the residual pressure of the exhaust steam as a power source for heat exchange, without the need to set up other power equipment to transport the exhaust steam to the shell-and-tube heat exchanger, which has a good energy-saving effect.

[0021] (4) This application is a comprehensive recovery device that integrates functions such as waste steam collection, heat exchange, condensation and circulation. This device can realize closed-loop recovery and utilization of waste steam, reducing energy waste and environmental pollution. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a deaerator waste heat recovery device provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a shell-and-tube heat exchanger provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a heat exchange tube and fins provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a deaerator waste heat recovery device provided in another embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the connection of a controller provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Deaerator; 2: Exhaust steam pipeline; 3: Shell and tube heat exchanger; 4: Low-level water tank; 6: Controller; 110: Three-way valve; 120: Exhaust steam bypass; 210: Exhaust steam direct discharge pipe; 310: Demineralized water input pipeline; 320: Demineralized water output pipeline; 330: Condensate output pipeline; 331: Steam trap; 332: First valve; 340: Non-condensable gas vent valve; 350: Pressure sensor; 360: Liquid phase vent valve; 370: Condensate bypass pipeline; 371: Second valve; 380: Demineralized water bypass pipeline; 381: Third valve; 410: Water quality monitor; 420: Level gauge; 430: Condensate return water pipeline; 431: Return water valve; 440: Fourth valve; 510: Heat exchange tube; 520: Baffle plate; 530: Fin. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0031] like Figure 1 As shown, this application provides a waste heat recovery device for a deaerator, including: a deaerator 1, a waste steam pipeline 2, and a shell-and-tube heat exchanger 3. The top of the deaerator 1 is connected to the waste steam pipeline 2. A three-way valve 110 is provided on the waste steam pipeline 2. The three-way valve 110 has one inlet and two outlets. The inlet of the three-way valve 110 is connected to the outlet of the waste steam pipeline 2. One outlet of the three-way valve 110 is connected to the waste steam direct discharge pipe 210. The other outlet of the three-way valve 110 is connected to the heat exchange medium inlet of the shell-and-tube heat exchanger 3 through the waste steam bypass 120.

[0032] The inlet end of the tube side of the shell-and-tube heat exchanger 3 is connected to a demineralized water inlet pipe 310, and the outlet end of the tube side of the shell-and-tube heat exchanger 3 is connected to a demineralized water outlet pipe 320. The demineralized water outlet pipe 320 is connected to the inlet of the deaerator 1. A condensate outlet pipe 330 is connected to the bottom of the side wall of the shell-and-tube heat exchanger 3, and the outlet end of the condensate outlet pipe 330 is connected to a low-level water tank 4.

[0033] Specifically, in this application, the residual pressure of the exhaust steam is used as a power source to output the exhaust steam in the deaerator 1 through the exhaust steam pipeline 2. After passing through the three-way valve 110, it is input into the shell side of the shell-and-tube heat exchanger 3 via the exhaust steam bypass 120 as a heat exchange medium. Demineralized water is input into the tube side of the shell-and-tube heat exchanger 3 through the demineralized water input pipeline 310. The exhaust steam and demineralized water exchange heat in the shell-and-tube heat exchanger 3. The exhaust steam is condensed into water and output through the condensate output pipeline 330 and collected in the low-level water tank 4 to realize the recycling of water resources. At the same time, the heated demineralized water is sent to the deaerator 1 for deoxygenation through the demineralized water output pipeline 320. In deaerator 1, deoxygenation is performed on the demineralized water. This is achieved by heating the demineralized water, which raises its temperature and reduces the dissolved oxygen content. In this application, the demineralized water is preheated by introducing waste steam into a shell-and-tube heat exchanger 3 before being introduced into deaerator 1. This not only increases the inlet water temperature of deaerator 1, reducing heat usage and energy loss, saving low-pressure steam, and lowering production costs, but also pre-deoxygenates the demineralized water, improving the deoxygenation efficiency of deaerator 1. Simultaneously, the condensate obtained after condensing waste steam is recovered in the low-level water tank 4, achieving full energy utilization and improving the company's economic efficiency. Furthermore, it reduces noise generation and reuses the recovered heat energy in the production system, reducing thermal pollution.

[0034] When the shell-and-tube heat exchanger 3 needs maintenance, adjust the three-way valve 110 to allow the exhaust steam to be discharged through the exhaust steam direct discharge pipe 210.

[0035] This application achieves waste heat recovery from the exhaust steam in the deaerator through the aforementioned scheme. By installing a shell-and-tube heat exchanger, the exhaust steam from the deaerator is transported to the shell-and-tube heat exchanger, where it exchanges heat with demineralized water. The exhaust steam is condensed into water, which is output through the condensate outlet pipe and collected in a low-level water tank, realizing the recycling of water resources. Simultaneously, the heated demineralized water is transported to the deaerator for deoxygenation through the demineralized water outlet pipe. In this application, by preheating the demineralized water before inputting it into the deaerator using the exhaust steam in the shell-and-tube heat exchanger, not only is the deaerator inlet water temperature increased, reducing heat usage in the deaerator, reducing heat loss, saving low-pressure steam, and lowering production costs, but it also pre-deoxygenates the demineralized water, improving the deoxygenation efficiency of the deaerator. Furthermore, the condensate obtained after exhaust steam condensation is recovered in the low-level water tank, achieving full utilization of energy and improving the company's economic benefits. It also reduces noise generation, reuses the recovered heat energy in the production system, and reduces thermal pollution. It meets the requirements of current national energy conservation, emission reduction and environmental protection policies, and has significant environmental benefits.

[0036] Optional, such as Figure 2 and Figure 3 As shown, the shell-and-tube heat exchanger 3 is provided with multiple heat exchange tubes 510 and baffles 520 inside. The baffles 520 are located at both ends inside the shell-and-tube heat exchanger 3, and the multiple heat exchange tubes 510 pass through the baffles 520 and are distributed in parallel.

[0037] Multiple heat exchange tubes 510 are provided with multiple fins 530 at equal intervals on their outer periphery, and the fins 530 are tilted at an angle of 30-60° in the vertical direction.

[0038] Specifically, there are two baffles 520 located at both ends inside the shell and tube heat exchanger 3. Multiple heat exchange tubes 510 pass through the baffles 520 and are distributed in parallel, so that the exhaust steam flows through the shell side and the demineralized water flows through the tube side, thereby realizing the recovery of heat from the exhaust steam and the working fluid.

[0039] To improve the heat exchange efficiency between demineralized water and exhaust steam in the shell-and-tube heat exchanger 3, fins 530 are provided on the outer periphery of the heat exchange tube 510. This improves the heat exchange efficiency between exhaust steam and demineralized water, thereby increasing heat recovery efficiency. Furthermore, the inclined arrangement of multiple fins 530 not only facilitates installation but also allows condensate to fall onto the lower fins 530 during the heat exchange process, extending the heat exchange time and improving overall efficiency.

[0040] Furthermore, the shell-and-tube heat exchanger 3 of this application uses the residual pressure of the exhaust steam as a power source for heat exchange during the heat exchange process, without the need to install other power equipment to transport the exhaust steam to the shell-and-tube heat exchanger 3, thus having a better energy-saving effect.

[0041] Optionally, the fins 530 on adjacent heat exchange tubes 510 may be staggered.

[0042] Specifically, the staggered arrangement refers to the misalignment of the fins 530 on adjacent heat exchange tubes 510 in the vertical direction, with the bottom end of the upper fin 530 positioned above the corresponding lower fin 530. This allows condensate dripping from the upper fin 530 to fall onto the lower fin 530 for further condensation, increasing the contact area, contact time, and mixing efficiency between the exhaust steam and the medium, ensuring sufficient heat transfer. This design offers advantages such as high heat exchange efficiency and sufficient heat and mass transfer, significantly improving heat recovery.

[0043] Furthermore, the heat exchange tube 510 is selected from stainless steel tube bundles, and the fins 530 are selected from stainless steel fins. Since there may be corrosive gases and media in the environment, which may cause corrosion to the equipment and affect its lifespan, stainless steel corrosion-resistant materials are selected to extend the service life of the equipment.

[0044] Optional, such as Figure 4 As shown, the top of the shell-and-tube heat exchanger 3 is equipped with a non-condensable gas exhaust valve 340 and a pressure sensor 350.

[0045] Specifically, the non-condensable gas remaining after heat exchange in the shell-and-tube heat exchanger 3 is vented through the non-condensable gas exhaust valve 340. At the same time, the pressure sensor 350 is used to detect the pressure in the shell-and-tube heat exchanger 3 in real time. If the pressure sensor 350 detects that the pressure value in the shell-and-tube heat exchanger 3 is greater than or equal to the preset pressure, the non-condensable gas exhaust valve 340 needs to be opened to vent the gas, so as to balance the pressure in the shell-and-tube heat exchanger 3 and improve the heat exchange efficiency.

[0046] Optionally, a liquid phase vent valve 360 ​​is provided at the tube-side outlet end of the shell-and-tube heat exchanger 3.

[0047] Specifically, the heated demineralized water accumulates at the end of the shell-and-tube heat exchanger 3 near the demineralized water output pipe 320, inevitably containing gas. The gas above the heated demineralized water is vented through the liquid phase exhaust valve 360, which helps to balance the gas in the shell-and-tube heat exchanger 3, and thus helps to ensure the continuous output of heated demineralized water, making the device operate stably.

[0048] Optionally, a steam trap 331 is installed on the condensate outlet pipe 330, and a first valve 332 is provided before and after the steam trap 331 on both sides of the condensate outlet pipe 330.

[0049] Optionally, a condensate bypass pipe 370 is provided at both ends of the condensate output pipe 330 and the two first valves 332, and a second valve 371 is provided on the condensate bypass pipe 370.

[0050] Specifically, the steam trap 331 is designed to prevent non-condensable gases from being transported to the low-level water tank 4 through the condensate output pipe 330. When the steam trap 331 malfunctions, the first valve 332 before and after the steam trap 331 is closed, and the second valve 371 is opened to discharge the condensate to the low-level water tank 4 through the condensate bypass pipe 370.

[0051] Optionally, a demineralized water inlet pipe 310 and a demineralized water outlet pipe 320 are connected in parallel to a demineralized water bypass pipe 380, and a third valve 381 is installed on the demineralized water bypass pipe 380. When the shell-and-tube heat exchanger 3 is under maintenance, the third valve 381 is opened to supply demineralized water to the deaerator 1 through the demineralized water inlet pipe 310 and the demineralized water bypass pipe 380.

[0052] Optionally, the low-level water tank 4 is equipped with a water quality monitor 410 and a level gauge 420. The low-level water tank 4 is connected to the deaerator 1 through a condensate return water pipeline 430. A return water valve 431 is installed on the condensate return water pipeline 430. The low-level water tank 4 is also equipped with a fourth valve 440.

[0053] Specifically, the condensate produced after the exhaust steam undergoes heat exchange is collected in the low-level water tank 4. The water quality is monitored by a water quality monitor 410 (e.g., chloride ions, calcium ions). If the quality meets the requirements, the return water valve 431 is opened, and the condensate is transported through the condensate return water pipeline 430 to the deaerator 1 for deoxygenation before reuse. This achieves water resource recycling, saves water resources, and has significant economic and environmental benefits. If the quality does not meet the requirements, the fourth valve 440 is opened, and the condensate is transported to the waste liquid station or other processes with lower water requirements (e.g., as circulating water) for reuse.

[0054] The level gauge 420 is used to detect the liquid level in the low-level water tank 4 in real time. When the detected liquid level is equal to the preset liquid level, the fourth valve 440 is adjusted to accelerate the discharge of condensate and prevent condensate from overflowing.

[0055] like Figure 5 As shown, optionally, the waste heat recovery device is also equipped with a controller 6, which is connected to a three-way valve 110, a non-condensable gas exhaust valve 340, a pressure sensor 350, a liquid phase exhaust valve 360, a first valve 332, a second valve 371, a third valve 381, a water quality monitor 410, a level gauge 420, a return water valve 431, and a fourth valve 440.

[0056] Specifically, controller 6 is used to open and close the three-way valve 110, liquid phase exhaust valve 360, first valve 332, second valve 371, and third valve 381. It also opens and closes the non-condensable gas exhaust valve 340 based on signals received from the pressure sensor 350, and opens and closes the return water valve 431 and fourth valve 440 based on signals received from the water quality monitor 410 and level gauge 420. The controller 6 improves system operating efficiency and stability while reducing manual operation costs.

[0057] The principle behind this application in actual operation is as follows:

[0058] The controller 6 opens the opening connecting the three-way valve 110 and the exhaust steam bypass 120, allowing exhaust steam to be fed into the shell side of the shell-and-tube heat exchanger 3 as a heat exchange medium. Demineralized water is fed into the tube side of the shell-and-tube heat exchanger 3 via the demineralized water inlet pipe 310. The exhaust steam and demineralized water exchange heat in the shell-and-tube heat exchanger 3, condensing the exhaust steam into water. The first valve 332 is then opened, and the condensate is discharged through the condensate outlet pipe 330 and collected in the low-level water tank 4, achieving water recycling. Simultaneously, the heated demineralized water is fed into the deaerator 1 via the demineralized water outlet pipe 320 for deoxygenation. When the shell-and-tube heat exchanger 3 requires maintenance, the controller 6 opens the regulating three-way valve 110 to vent the exhaust steam through the exhaust steam direct discharge pipe 210, and simultaneously opens the third valve 381 to feed demineralized water into the deaerator 1 via the demineralized water inlet pipe 310 and the demineralized water bypass pipe 380.

[0059] Pressure sensor 350 is used to detect the pressure in shell-and-tube heat exchanger 3 in real time. If pressure sensor 350 detects that the pressure value in shell-and-tube heat exchanger 3 is equal to the preset pressure, it needs to be vented through non-condensable gas vent valve 340 to balance the pressure in shell-and-tube heat exchanger 3 and improve heat exchange efficiency. At the same time, the liquid phase vent valve 360 ​​is opened by controller 6 to vent the gas above the heated demineralized water, which is beneficial to the gas balance in shell-and-tube heat exchanger 3. When steam trap 331 fails, the first valve 332 before and after steam trap 331 is closed, and the second valve 371 is opened to discharge condensate through condensate bypass pipe 370 to low-level water tank 4. Level gauge 420 detects the liquid level in low-level water tank 4 in real time and transmits the detected liquid level signal to controller 6 in real time. When the liquid level signal received by controller 6 is equal to the preset liquid level, controller 6 adjusts the fourth valve 440 to accelerate the discharge of condensate and prevent condensate overflow.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A waste heat recovery device for a deaerator, characterized in that, include: Deaerator (1), exhaust steam pipeline (2), shell and tube heat exchanger (3). The top of the deaerator (1) is connected to a waste steam pipe (2), and a three-way valve (110) is installed on the waste steam pipe (2). The three-way valve (110) has one inlet and two outlets. The inlet of the three-way valve (110) is connected to the outlet of the waste steam pipe (2), one outlet of the three-way valve (110) is connected to the waste steam direct discharge pipe (210), and the other outlet of the three-way valve (110) is connected to the heat exchange medium inlet of the shell-and-tube heat exchanger (3) through the waste steam bypass (120). The shell-and-tube heat exchanger (3) has a demineralized water inlet pipe (310) connected to the tube side inlet end and a demineralized water outlet pipe (320) connected to the tube side outlet end. The demineralized water outlet pipe (320) is connected to the inlet of the deaerator (1). A condensate outlet pipe (330) is connected to the side wall of the shell-and-tube heat exchanger (3). The outlet end of the condensate outlet pipe (330) is connected to a low-level water tank (4).

2. The deaerator waste heat recovery device according to claim 1, characterized in that, The shell-and-tube heat exchanger (3) is provided with a plurality of heat exchange tubes (510) and a partition (520) inside. The partition (520) is located at both ends inside the shell-and-tube heat exchanger (3), and the plurality of heat exchange tubes (510) pass through the partition (520) and are distributed in parallel. Multiple heat exchange tubes (510) are provided with multiple fins (530) at equal intervals on their outer periphery, and the fins (530) are inclined at an angle of 30-60° to the vertical direction.

3. The deaerator waste heat recovery device according to claim 2, characterized in that, The fins (530) on the adjacent heat exchange tubes (510) are staggered.

4. The deaerator waste heat recovery device according to claim 1, characterized in that, The top of the shell-and-tube heat exchanger (3) is equipped with a non-condensable gas exhaust valve (340) and a pressure sensor (350).

5. The deaerator waste heat recovery device according to claim 4, characterized in that, The shell-and-tube heat exchanger (3) is equipped with a liquid phase exhaust valve (360) at the tube outlet end.

6. The deaerator waste heat recovery device according to claim 5, characterized in that, A steam trap (331) is installed on the condensate outlet pipe (330), and a first valve (332) is provided before and after the steam trap (331) on the condensate outlet pipe (330).

7. The deaerator waste heat recovery device according to claim 6, characterized in that, The condensate output pipe (330) is provided with a condensate bypass pipe (370) at both ends of the two first valves (332), and a second valve (371) is provided on the condensate bypass pipe (370).

8. The deaerator waste heat recovery device according to claim 7, characterized in that, A demineralized water inlet pipeline (310) and a demineralized water outlet pipeline (320) are connected in parallel to a demineralized water bypass pipeline (380), and a third valve (381) is provided on the demineralized water bypass pipeline (380).

9. The deaerator waste heat recovery device according to claim 8, characterized in that, The low-level water tank (4) is equipped with a water quality monitor (410) and a level gauge (420). The low-level water tank (4) is connected to the deaerator (1) through a condensate return water pipeline (430). A return water valve (431) is installed on the condensate return water pipeline (430). The low-level water tank (4) is also equipped with a fourth valve (440).

10. The deaerator waste heat recovery device according to claim 9, characterized in that, The waste heat recovery device is also equipped with a controller (6), which is connected to the three-way valve (110), the non-condensable gas exhaust valve (340), the pressure sensor (350), the liquid phase exhaust valve (360), the first valve (332), the second valve (371), the third valve (381), the water quality monitor (410), the level gauge (420), the return water valve (431), and the fourth valve (440).

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