Circulating water heat energy recycling device for power plant

Abstract

The utility model discloses a circulating water heat energy recycling device for a power plant, and relates to the technical field of energy conservation and emission reduction. The steam heat exchanger comprises a heat exchange cylinder, a steam heat exchange part is fixedly arranged in the heat exchange cylinder and comprises a middle pipe, an upper branch pipe is fixedly arranged at the upper end of the middle pipe, and a lower branch pipe is fixedly arranged at the lower end of the middle pipe. According to the utility model, hot steam is guided into the heat exchange fin plates in the steam heat exchange piece, so that the hot steam can quickly exchange heat with urban water supply in the heat exchange cylinder on the inner wall of the heat exchange cavity, and the heat energy of the hot steam is recycled; circulating water in the power generation process of the power plant is guided into the spiral heat exchange pipe in the circulating water heat exchange piece, heat exchange can be fully conducted between the circulating water and urban water supply, heat energy in the circulating water is better recycled, the heat exchange area of the circulating water heat exchange piece can be increased through the arranged heat exchange fins, and the heat exchange efficiency of the circulating water heat exchange piece is improved. And the heat exchange efficiency of circulating water is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy conservation and emission reduction, and particularly relates to a circulating water heat energy recycling device for a power plant. Background Art

[0002] During the power generation process, steam becomes low-temperature steam after working in the turbine and is discharged into the condenser to condense and release heat. The circulating water and water vapor containing heat energy are taken to the cooling tower and directly discharged into the atmosphere. Because the discharged heat energy is very large, it causes huge energy waste. After searching, the patent with application number 202123390048.2 discloses a circulating water heat energy recycling device for a power plant, including a heat exchange box. The heat exchange box has partition plates fixed on both sides of the middle part. The two partition plates divide the heat exchange box into three cavities. The middle cavity is an overflow cavity, and both sides are flow cavities. A water inlet assembly is provided at the top of one end of the heat exchange box at the position of the overflow cavity. Mounting holes are opened at the bottom position of the inner wall of both ends of the overflow cavity. Hot water pipes are fixed to the inner walls of the two mounting holes. The outer peripheral wall of the hot water pipe is provided with a stirring assembly. The water inlet assembly includes a water pump fixed on the top of the heat exchange box, a water inlet pipe installed on the input end of the water pump through a flange, and a water delivery pipe installed on the output end of the water pump through a flange.

[0003] However, during actual use, the applicant found that when the hot circulating water passes through the inside of the hot water pipe, since the hot water pipe is a straight pipe, the hot circulating water flows out quickly before sufficient and effective heat exchange occurs, and the heat energy cannot be effectively reused. In view of this, we propose a circulating water heat energy recycling device for a power plant. Utility Model Content

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The utility model is a circulating water heat energy recycling device for a power plant, comprising a heat exchange cylinder, wherein a steam heat exchange component is fixedly provided inside the heat exchange cylinder, the steam heat exchange component comprises an intermediate tube, an upper branch tube is fixedly provided on the upper end of the intermediate tube, a lower branch tube is fixedly provided on the lower end of the intermediate tube, a heat exchange fin is fixedly provided on the peripheral side wall of the intermediate tube, a heat exchange cavity is defined inside the heat exchange fin, a circulating water heat exchange component is externally sheathed on the steam heat exchange component, the circulating water heat exchange component comprises a spiral heat exchange tube, an inlet pipe is fixedly provided on the upper end of the spiral heat exchange tube, a return pipe is fixedly provided on the lower end of the spiral heat exchange tube, a water inlet branch pipe is fixedly passed through the side of the outer wall of the heat exchange cylinder away from the return pipe, and a water outlet branch pipe is fixedly passed through the side of the outer wall of the heat exchange cylinder away from the water inlet pipe.

[0006] Preferably, heat exchange fins are fixedly provided on the spiral heat exchange tube, and the heat exchange fins pass through the spiral heat exchange tube.

[0007] Preferably, the heat exchange fins are arranged along the spiral path of the spiral heat exchange tube, and the length of the heat exchange fins is equal to that of the spiral heat exchange tube.

[0008] Preferably, the upper end of the upper branch pipe passes through the top of the heat exchange tube, and the lower end of the lower branch pipe passes through the bottom of the heat exchange tube.

[0009] Preferably, six heat exchange fins are arranged on the peripheral side wall of the intermediate tube in an annular array.

[0010] Preferably, the water inlet pipe is fixed through the side wall of the upper portion of the heat exchange cylinder, and the return pipe is fixed through the side wall of the lower portion of the heat exchange cylinder.

[0011] The utility model has the following beneficial effects:

[0012] The utility model relates to a device for recycling heat energy of circulating water in a power plant. By introducing hot steam into the heat exchange fins in the steam heat exchange element, the hot steam can quickly exchange heat with the city water supply inside the heat exchange cylinder on the inner wall of the heat exchange chamber, so as to reuse the heat energy of the hot steam. By introducing the circulating water in the power generation process of the power plant into the spiral heat exchange tube in the circulating water heat exchange element, the flow rate of the circulating water can be slowed down, and the circulating water can have a longer heat exchange path, so that the circulating water can fully exchange heat with the city water supply, and the heat energy in the circulating water can be better reused. The heat exchange fins can be increased to increase the heat exchange area of ​​the circulating water heat exchange element, further improve the heat exchange efficiency of the circulating water, and effectively reuse the heat energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 This is a schematic diagram of the internal structure of a circulating water heat energy recycling device for a power plant according to the present utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of a steam heat exchanger in a circulating water heat energy recycling device for a power plant according to the present invention;

[0016] Figure 3 The utility model is a schematic structural diagram of a circulating water heat exchanger in a circulating water heat energy recycling device for a power plant.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0018] 1. Heat exchange cylinder; 11. Water inlet branch; 12. Water outlet branch; 2. Steam heat exchange element; 21. Intermediate tube; 22. Upper branch; 23. Lower branch; 24. Heat exchange fins; 25. Heat exchange cavity; 3. Circulating water heat exchange element; 31. Spiral heat exchange tube; 32. Water inlet pipe; 33. Return pipe; 34. Heat exchange fins. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 As shown, the utility model provides a technical solution:

[0021] A circulating water heat energy recycling device for a power plant includes a heat exchange tube 1, a steam heat exchange element 2 is fixedly provided inside the heat exchange tube 1, and the steam heat exchange element 2 includes an intermediate tube 21, an upper branch tube 22 is fixedly provided at the upper end of the intermediate tube 21, and the upper end of the upper branch tube 22 passes through the top of the heat exchange tube 1, and a lower branch tube 23 is fixedly provided at the lower end of the intermediate tube 21, and the lower end of the lower branch tube 23 passes through the bottom of the heat exchange tube 1, and a heat exchange fin plate 24 is fixedly provided on the peripheral side wall of the intermediate tube 21. There are six heat exchange fin plates 24 on the peripheral side wall of the intermediate tube 21 in an annular array, and a heat exchange cavity 25 is opened inside the heat exchange fin plate 24. By introducing hot steam into the heat exchange cavity 25, the heat exchange cavity 25 is heated. The heat exchange fins 24 in the steam heat exchanger 2 can quickly exchange heat between the hot steam and the city water supply inside the heat exchanger tube 1 on the inner wall of the heat exchange chamber 25, so as to reuse the heat energy of the hot steam. The outer sleeve of the steam heat exchanger 2 is provided with a circulating water heat exchanger 3. The circulating water heat exchanger 3 includes a spiral heat exchange tube 31. The upper end of the spiral heat exchanger 31 is fixedly provided with a water inlet pipe 32. The water inlet pipe 32 is fixed to the side wall of the upper part of the heat exchanger tube 1. The lower end of the spiral heat exchanger 31 is fixedly provided with a return pipe 33. The return pipe 33 is fixed to the side wall of the lower part of the heat exchanger tube 1. By introducing the circulating water in the power generation process of the power plant into the circulating water, the circulating water in the power plant is recycled. The spiral heat exchange tube 31 in the water heat exchange element 3 can slow down the flow rate of the circulating water and make the circulating water have a longer heat exchange path, so that the circulating water can fully exchange heat with the city water supply and better reuse the heat energy in the circulating water. The side of the outer wall of the heat exchange cylinder 1 away from the return pipe 33 is fixed with an inlet branch pipe 11, and the side of the outer wall of the heat exchange cylinder 1 away from the water inlet pipe 32 is fixed with an outlet branch pipe 12. When in use, the city water supply can be introduced into the heat exchange cylinder 1 from the inlet branch pipe 11, and the steam can be introduced from the upper branch pipe 22 into the middle pipe 21, and the hot circulating water can be introduced from the inlet pipe 32 into the spiral heat exchange tube 31. In the process, the steam entering the intermediate tube 21 can enter the heat exchange cavity 25, and can exchange heat with the city water supply inside the heat exchange tube 1 on the surface of the heat exchange fin 24. The gas after heat exchange can be introduced into the external cooling tower and discharged after final cooling. The hot circulating water flows along the spiral heat exchange tube 31, and can exchange heat with the city water supply inside the heat exchange tube 1 on the surface of the spiral heat exchange tube 31. Finally, the circulating water after heat exchange can be refluxed from the return pipe 33, and the heated city water supply can be discharged to the external city water supply pipeline through the outlet branch pipe 12, thereby realizing the reuse of the thermal energy of the circulating water in the power plant.

[0022] Heat exchange fins 34 are fixedly provided on the spiral heat exchange tube 31, and the heat exchange fins 34 pass through the spiral heat exchange tube 31. The heat exchange fins 34 are arranged along the spiral path of the spiral heat exchange tube 31, and the heat exchange fins 34 are equal to the length of the spiral heat exchange tube 31. By setting the heat exchange fins 34, the heat exchange area of ​​the circulating water heat exchange element 3 can be increased, the heat exchange efficiency of the circulating water can be further improved, and the heat energy can be effectively reused. In the process of heat exchange between the hot circulating water and the city water supply inside the heat exchange tube 1, the hot circulating water can simultaneously exchange heat with the city water supply inside the heat exchange tube 1 on the surface of the heat exchange fins 34.

[0023] Working principle: When in use, the city water supply can be introduced into the heat exchange tube 1 from the water inlet branch 11, and the steam can be introduced into the intermediate tube 21 from the upper branch 22, and the hot circulating water can be introduced into the spiral heat exchange tube 31 from the water inlet pipe 32. The steam entering the intermediate tube 21 can enter the heat exchange cavity 25 and can exchange heat with the city water supply inside the heat exchange tube 1 on the surface of the heat exchange fin 24. The gas after heat exchange can be introduced into the external cooling tower for final cooling and then discharged. The hot circulating water flows along the spiral heat exchange tube 31. , heat exchange can occur on the surface of the spiral heat exchange tube 31 with the city water supply inside the heat exchange tube 1. During the heat exchange process between the hot circulating water and the city water supply inside the heat exchange tube 1, the hot circulating water can simultaneously exchange heat with the city water supply inside the heat exchange tube 1 on the surface of the heat exchange fins 34. Finally, the circulating water after heat exchange can be refluxed from the return pipe 33, and the heated city water supply can be discharged to the external city water supply pipeline through the water outlet branch pipe 12, thereby realizing the reuse of the thermal energy of the circulating water in the power plant.

[0024] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0025] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions described in the aforementioned embodiments and any equivalent replacement of some of the technical features therein fall within the scope of protection of the present invention.

Claims

1. A circulating water heat energy recycling device for a power plant, comprising a heat exchange cylinder (1), characterized in that: A steam heat exchange component (2) is fixedly provided inside the heat exchange cylinder (1), and the steam heat exchange component (2) includes an intermediate tube (21), an upper branch tube (22) is fixedly provided at the upper end of the intermediate tube (21), a lower branch tube (23) is fixedly provided at the lower end of the intermediate tube (21), a heat exchange fin plate (24) is fixedly provided on the peripheral side wall of the intermediate tube (21), a heat exchange cavity (25) is provided inside the heat exchange fin plate (24), and the outer sleeve of the steam heat exchange component (2) is provided. A circulating water heat exchange component (3) is provided, the circulating water heat exchange component (3) comprising a spiral heat exchange tube (31), a water inlet tube (32) being fixedly provided at the upper end of the spiral heat exchange tube (31), a return tube (33) being fixedly provided at the lower end of the spiral heat exchange tube (31), a water inlet branch tube (11) being fixedly passed through the side of the outer wall of the heat exchange tube (1) away from the return tube (33), and a water outlet branch tube (12) being fixedly passed through the side of the outer wall of the heat exchange tube (1) away from the water inlet tube (32).

2. The power plant circulating water heat energy recycling device according to claim 1, characterized in that: A heat exchange fin (34) is fixedly provided on the spiral heat exchange tube (31), and the heat exchange fin (34) passes through the spiral heat exchange tube (31).

3. The power plant circulating water heat energy recycling device according to claim 2, characterized in that: The heat exchange fins (34) are arranged along the spiral path of the spiral heat exchange tube (31), and the length of the heat exchange fins (34) is equal to that of the spiral heat exchange tube (31).

4. The power plant circulating water heat energy recycling device according to claim 1, characterized in that: The upper end of the upper branch pipe (22) passes through the top of the heat exchange tube (1), and the lower end of the lower branch pipe (23) passes through the bottom of the heat exchange tube (1).

5. The power plant circulating water heat energy recycling device according to claim 1, characterized in that: Six heat exchange fins (24) are arranged in a circular array on the peripheral side wall of the intermediate tube (21).

6. The power plant circulating water heat energy recycling device according to claim 1, characterized in that: The water inlet pipe (32) is fixed on the upper side wall of the heat exchange cylinder (1), and the return pipe (33) is fixed on the lower side wall of the heat exchange cylinder (1).

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