Waste heat recovery device

Abstract

The utility model relates to a waste heat recovery device which is used for recovering heat of steam discharged by a steam turbine and comprises a heat exchange water tank arranged on one side of the steam turbine and used for containing condensate water and provided with a water injection port and a water outlet; the coil pipe is arranged in the heat exchange water tank, an inlet and an outlet of the coil pipe extend out of the heat exchange water tank, the inlet is used for being connected with an exhaust port of a steam turbine, and steam in the coil pipe can exchange heat with condensate water in the heat exchange water tank to form hot water; the water collecting tank is arranged at the downstream of the heat exchange water tank, and an outlet is connected with the water collecting tank to collect hot water in the coil pipe; the stirring mechanism is connected with the heat exchange water tank and used for stirring condensate water in the heat exchange water tank. The condensate water after heat exchange becomes hot water, and the hot water is discharged through the water outlet of the heat exchange water tank for urban heating and the like, so that the heat waste of waste steam and the formation of urban heat island effect are avoided, and the utilization efficiency of energy is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbines, and in particular to a waste heat recovery device. Background Art

[0002] Steam turbines are a key component of thermal power plants. In conventional technology, after high-temperature, high-pressure steam passes through the turbine to generate power, its residual heat is piped into a condenser and cooled into water. This water is then transported to the boiler, conserving water resources. However, the heat generated during the condensation process is directly released into the atmosphere, resulting in heat waste. Utility Model Content

[0003] The purpose of the present disclosure is to provide a waste heat recovery device to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a waste heat recovery device for recovering heat from steam exhausted by a steam turbine, the waste heat recovery device comprising:

[0005] a heat exchange water tank, arranged on one side of the steam turbine, for accommodating condensed water, and having a water inlet and a water outlet;

[0006] a coil disposed in the heat exchange water tank, wherein the inlet and outlet of the coil extend out of the heat exchange water tank respectively, the inlet being connected to the exhaust port of the steam turbine, and the steam in the coil being able to exchange heat with the condensed water in the heat exchange water tank to form hot water;

[0007] a water collecting tank, disposed downstream of the heat exchange water tank, the outlet being connected to the water collecting tank to collect the hot water in the coil; and

[0008] The stirring mechanism is connected to the heat exchange water tank and is used for stirring the condensed water in the heat exchange water tank.

[0009] Optionally, the stirring mechanism includes:

[0010] A driving motor is fixed to the outer wall of the water exchange tank;

[0011] a shaft located in the heat exchange water tank and below the coil, one end of the shaft extending out of the outer wall of the heat exchange water tank and connected to the drive motor; and

[0012] The stirring blades are arranged on the outer peripheral wall of the shaft. The stirring blades are arranged in a plurality of groups at intervals along the circumferential direction, and the plurality of stirring blades in two adjacent groups are staggered in the axial direction.

[0013] Optionally, the stirring mechanism further includes a coupling installed between the shaft and the rotating shaft of the drive motor.

[0014] Optionally, the waste heat recovery device further comprises a plurality of drip filtration pipes installed in the water collecting tank, and the outlet of the coil pipe is in communication with the plurality of drip filtration pipes through connecting pipes.

[0015] Optionally, a plurality of filter baskets are arranged below the plurality of drip filtration pipes, and the filter baskets are slidably connected to the opposite inner walls of the water collecting tank.

[0016] Optionally, the plurality of filter baskets are arranged in a stacked manner along the height direction of the water collecting tank.

[0017] Optionally, the coil pipe is coiled into multiple layers along the length direction of the heat exchange water tank.

[0018] Optionally, the bottom of the water collecting tank is configured in a V shape, and the lowest point of the V shape is provided with a drain pipe.

[0019] Optionally, the water inlet is arranged at the top of the heat exchange water tank, and a cover plate is arranged at the water inlet, and the cover plate is detachably connected to the heat exchange water tank.

[0020] Optionally, a gas valve is arranged on the cover plate.

[0021] The technical scheme provided by the embodiments of the present disclosure can include the following beneficial effects:

[0022] The inlet of the coil pipe is in communication with the exhaust port of the steam turbine, the exhaust steam discharged from the steam turbine can enter the coil pipe, the exhaust steam can exchange heat with the condensed water in the heat exchange water tank, the exhaust steam is liquefied into water after heat exchange, the water enters the water collecting tank through the outlet of the coil pipe, the condensed water after heat exchange becomes hot water, and the hot water is discharged through the water outlet of the heat exchange water tank for city heating and the like, thereby avoiding waste of heat of the exhaust steam and formation of urban heat island effect, and improving energy utilization efficiency. The stirring mechanism is used for stirring the condensed water in the heat exchange water tank, thereby improving the heat exchange efficiency of the condensed water and the exhaust steam, avoiding uneven water temperature and scale deposition on the coil pipe, and ensuring the efficiency and stability of waste heat recovery.

[0023] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0025] Figure 1 is a schematic view of a waste heat recovery device according to an exemplary embodiment of the present disclosure.

[0026] Figure 2 is a sectional view of a waste heat recovery device according to an exemplary embodiment of the present disclosure.

[0027] Figure 3 is Figure 2 is a partial enlarged view of part A in figure 1.

[0028] Figure 4 is a schematic view of a filter basket in a waste heat recovery device according to an exemplary embodiment of the present disclosure.

[0029] Explanation of reference signs

[0030] 1, steam turbine; 2, heat exchange water tank; 3, coil pipe; 4, air guide pipe; 5, water collecting tank; 6, dripping flow filter pipe; 7, connecting pipe; 8, filter basket; 9, filter plate; 10, shaft rod; 11, stirring blade; 12, driving motor; 13, coupling; 14, cover plate; 15, drain pipe; 16, water valve; 17, exhaust pipe; 18, air valve. DETAILED DESCRIPTION

[0031] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0032] In the present disclosure, the orientation words such as "up, down, left, right" are used for the convenience of description defined according to the drawing direction of the corresponding drawing, and "inner, outer" are defined according to the outline of the corresponding part itself. The terms such as "first, second" used in the present disclosure are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, when the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0033] The exhaust steam discharged from the steam turbine of the Jianwei power plant enters the condenser through the pipeline, the circulating water pump on the Yangtze River communicates with the condenser through the pipeline, and the circulating water enters from the top and exits from the bottom, which is opposite to the movement direction of the exhaust steam in the condenser, so as to take away the heat of the exhaust steam. In this process, the heat of the exhaust steam will enter the Yangtze River, which will cause the waste of energy and the formation of urban heat island effect.

[0034] Therefore, the present disclosure provides a waste heat recovery device to reduce the waste of heat of the exhaust steam and the formation of urban heat island effect. Please refer to Figure 1 and Figure 2The present disclosure provides a waste heat recovery device for recovering heat from steam exhausted from a steam turbine 1. The waste heat recovery device may include a water collecting tank 5, a heat exchange tank 2, a coil 3, and a stirring mechanism. The heat exchange tank 2 may be located on one side of the steam turbine 1. The heat exchange tank 2 may be used to accommodate condensed water and may be provided with an inlet and an outlet. The outlet may be located at the bottom of the heat exchange tank 2 to facilitate the discharge of water from the heat exchange tank 2. The coil 3 may be located within the heat exchange tank 2, with the inlet and outlet of the coil 3 extending out of the heat exchange tank 2. The inlet is connected to the exhaust port of the steam turbine 1. The steam within the coil 3 can exchange heat with the condensed water within the heat exchange tank 2 to form hot water. The inlet of the coil 3 is connected to the exhaust port of the steam turbine 1 via an air duct 4, which is equipped with a check valve. The water collecting tank 5 may be located downstream of the heat exchange tank 2, with the outlet connected to the water collecting tank 5 to collect the hot water within the coil 3. The stirring mechanism can be connected to the heat exchange water tank 2 so as to be used to stir the condensed water.

[0035] It is understood that the inlet of coil 3 is connected to the exhaust port of steam turbine 1, and the exhaust steam discharged by steam turbine 1 can enter coil 3. The exhaust steam can undergo heat exchange with condensed water in heat exchange water tank 2. After heat exchange, the exhaust steam is liquefied into water, which enters water collecting tank 5 through the outlet of coil 3. The condensed water after heat exchange becomes hot water, which is discharged through the outlet of heat exchange water tank 2 for use in urban heating, etc., avoiding heat waste of exhaust steam and the formation of urban heat island effect, and improving energy utilization efficiency. The stirring mechanism is used to stir the condensed water in heat exchange water tank 2, improving the heat exchange efficiency between condensed water and exhaust steam, avoiding uneven water temperature and scale deposition on coil 3, and ensuring the efficiency and stability of waste heat recovery.

[0036] In one embodiment, the heat exchange water tank 2, the coil 3 and the stirring mechanism can be multiple groups to better collect the heat of the waste steam. A thermometer can be installed in the heat exchange water tank 2 to facilitate workers to understand the water temperature, and the water is discharged when the water temperature reaches the required temperature.

[0037] In one embodiment, see Figure 2 and Figure 3The stirring mechanism may include a drive motor 12, a shaft 10 and a stirring blade 11. The drive motor 12 may be fixed to the outer wall of the heat exchange water tank 2. The shaft 10 may be located inside the heat exchange water tank 2 and below the coil 3, with one end of the shaft 10 extending out of the outer wall of the heat exchange water tank 2 and connected to the drive motor 12. The stirring blade 11 may be provided on the outer peripheral wall of the shaft 10, and the stirring blades 11 may be arranged in multiple groups spaced apart along the circumferential direction, with the multiple stirring blades 11 of two adjacent groups staggered in the axial direction. The drive motor 12 drives the stirring blade 11 to stir the condensed water to speed up the heat exchange efficiency between the condensed water and the waste steam. The rotating shaft of the drive motor 12 is relatively short, so the stirring blade 11 can only stir the condensed water in a small range. By providing the shaft 10, more stirring blades 11 can be installed in the heat exchange water tank 2, so that the stirring blade 11 can stir the condensed water in a large range, thereby improving the heat exchange efficiency between the condensed water and the waste steam.

[0038] In one embodiment, see Figure 2 and Figure 3 The stirring mechanism may further include a coupling 13, which may be installed between the shaft 10 and the rotating shaft of the drive motor 12. The coupling 13 may effectively reduce shaft deviation, displacement, and angular deviation, reduce vibration, noise, and friction loss of the device, and improve the rotation effect of the drive motor 12 on the shaft 10.

[0039] In one embodiment, see Figure 2 The waste heat recovery device can also include multiple trickling filter tubes 6 installed in the water collecting tank 5. The outlet of the coil 3 can be connected to the multiple trickling filter tubes 6 through the connecting pipe 7. Each trickling filter tube 6 is provided with a multi-layer filtering structure to ensure that the water collected in the water collecting tank 5 is relatively clean, providing conditions for subsequent water reuse.

[0040] In one embodiment, see Figure 2 and Figure 4 A filter basket 8 can be provided below the multiple trickling filter tubes 6. The sides of the filter basket 8 can be slidably connected to the opposite inner walls of the water collection tank 5. Water can flow through the multiple trickling filter tubes 6 and fall into the filter basket 8. The use of multiple trickling filter tubes 6 ensures that the water flows evenly through the filter material in the filter basket 8, maximizing the use value of the filter material.

[0041] In one embodiment, see Figure 2, the number of filter baskets 8 can be multiple, and can be stacked along the height direction of the water collecting box 5. For example, the number of filter baskets 8 can be three or more than four. Providing multiple filter baskets 8 can increase the water purification effect. A filter plate 9 can be provided under the filter basket 8, and the two sides of the filter plate 9 can be respectively slidably connected to the two opposite inner walls of the water collecting box 5. Providing the filter plate 9 can increase the water purification effect. The water collecting box 5 can be provided with an inspection port, and an openable and closable box door is provided in the inspection port. The box door is provided with a hinge and a handle lock, and the hinge is fixedly connected to the water collecting box 5. The inspection port on one side of the water collecting box 5 and the design of the openable and closable box door facilitate the inspection and replacement of components such as the filter basket 8 and the filter plate 9, thereby improving the maintainability and service life of the device.

[0042] In one embodiment, see Figure 2 The coil 3 can be wound in multiple layers along the length of the heat exchange water tank 2. This coiled arrangement increases the contact area between the coil 3 and the condensate and the time the waste steam spends in the condensate, ensuring a cooling effect on the waste steam. The number of coil layers can be selected based on the waste steam cooling requirements and is not specifically limited here.

[0043] In one embodiment, see Figure 2 The bottom of the water collecting tank 5 can be constructed in a V-shape. A drain pipe 15 can be installed at the lowest point of the V to ensure that the collected water can be discharged smoothly and prevent water from accumulating in the water collecting tank 5. The drain pipe 15 can be used to connect to the water inlet of the boiler to facilitate the recycling of water resources. A water valve 16 can be installed on the drain pipe 15.

[0044] In one embodiment, see Figure 2 The water filling port can be opened at the top of the hot water exchange tank 2, and a cover plate 14 can be installed at the water filling port. The cover plate 14 can be detachably connected to the hot water exchange tank 2, and new condensed water can be poured into the hot water exchange tank 2 by opening the cover plate 14.

[0045] In one embodiment, see Figure 2 An exhaust pipe 17 can be installed on the cover plate 14, and an air valve 18 can be installed on the exhaust pipe 17 to facilitate adjusting the air pressure of the water exchange tank 2 and prevent water from overflowing, avoiding safety hazards caused by excessive pressure or gas accumulation.

[0046] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0047] It should be further noted that various technical features described in the above specific embodiments can be combined in any suitable manner, and the disclosure is not limited to the combinations explicitly described herein, unless otherwise indicated.

[0048] Furthermore, various different embodiments of the disclosure can be combined in any suitable manner, as long as it does not deviate from the spirit of the disclosure, and it should be considered as disclosed by the disclosure.

Claims

1. A waste heat recovery device for recovering the heat of steam discharged from a steam turbine, characterized in that: The waste heat recovery device comprises: a heat exchange water tank, arranged on one side of the steam turbine, for accommodating condensed water, and having a water inlet and a water outlet; a coil disposed in the heat exchange water tank, wherein the inlet and outlet of the coil extend out of the heat exchange water tank respectively, the inlet being connected to the exhaust port of the steam turbine, and the steam in the coil being able to exchange heat with the condensed water in the heat exchange water tank to form hot water; a water collecting tank, disposed downstream of the heat exchange water tank, the outlet being connected to the water collecting tank to collect the hot water in the coil; and The stirring mechanism is connected to the heat exchange water tank and is used for stirring the condensed water in the heat exchange water tank.

2. The waste heat recovery device according to claim 1, characterized in that: The stirring mechanism comprises: A driving motor is fixed to the outer wall of the water exchange tank; a shaft located in the heat exchange water tank and below the coil, one end of the shaft extending out of the outer wall of the heat exchange water tank and connected to the drive motor; and The stirring blades are arranged on the outer peripheral wall of the shaft. The stirring blades are arranged in a plurality of groups at intervals along the circumferential direction, and the plurality of stirring blades in two adjacent groups are staggered in the axial direction.

3. The waste heat recovery device according to claim 2, characterized in that: The stirring mechanism further includes a coupling installed between the shaft and the rotating shaft of the driving motor.

4. The waste heat recovery device according to claim 1, characterized in that: The waste heat recovery device further comprises a plurality of trickling filter tubes installed in the water collecting tank, and the outlets of the coil are respectively connected to the plurality of trickling filter tubes through connecting pipes.

5. The waste heat recovery device according to claim 4, characterized in that: A filter basket is provided below the plurality of trickling filter tubes, and two sides of the filter basket are respectively slidably connected to two opposite inner walls of the water collecting box.

6. The waste heat recovery device according to claim 5, characterized in that: There are multiple filter baskets, which are stacked along the height direction of the water collecting tank.

7. The waste heat recovery device according to claim 1, characterized in that: The coils are wound in multiple layers along the length of the hot water exchange tank.

8. The waste heat recovery device according to claim 1, characterized in that: The bottom structure of the water collecting tank is V-shaped, and a drainage pipe is installed at the lowest point of the V-shape.

9. The waste heat recovery device according to claim 1, characterized in that: The water inlet is opened at the top of the heat exchange water tank, and a cover plate is installed at the water inlet. The cover plate is detachably connected to the heat exchange water tank.

10. The waste heat recovery device according to claim 9, characterized in that: An air valve is installed on the cover plate.

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