Power plant cooling water waste heat recycling device

Abstract

The invention relates to the technical field of waste heat recovery, and discloses a power plant cooling water waste heat recycling device which comprises a cylinder. At least two hot water pipes; at least two water gathering rings; the dirt cleaning part comprises a cleaning belt, the cleaning belt wraps the heat exchange pipe through a limiting frame, the cleaning belt is driven by a driving mechanism, and the driving mechanism has driving force for driving the cleaning belt to be attached to the heat exchange pipe for circumferential transmission and linear displacement force for driving the cleaning belt to move in the radial direction of the heat exchange pipe; according to the design, through dual driving force of the driving mechanism, the cleaning belt is in circumferential fit transmission and radial movement along the heat exchange tubes, can be tightly attached to the outer walls of the bent and parallel heat exchange tubes and scrapes CaCO3 scale layers of all the tube sections, the cleaning problem of the heat exchange tubes of complex structures is solved, and the situation that dirt is attached to the outer walls of the heat exchange tubes, consequently, heat resistance is increased, and the service life of the heat exchange tubes is prolonged is avoided. And the heat exchange efficiency is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery, in particular to a power plant cooling water waste heat recovery and utilization device. BACKGROUND

[0002] Thermal power plants usually need cooling water to cool the heat generated in the power generation process, because the combustion and steam generation in the power generation process will produce a large amount of waste heat, if not cooled, the waste heat will cause the equipment to overheat, efficiency to decline, and even equipment damage, therefore, in order to maintain the normal operation of the thermal power plant and ensure the efficiency of the power generation equipment, the waste heat needs to be cooled off, and the high-temperature cooling water is usually used to preheat the water used in the thermal power plant; When preheating, the high-temperature cooling water enters the heat exchange pipe from the water inlet section of the hot water pipe, and when the high-temperature cooling water passes through the heat exchange pipe, it will transfer heat to the water source in the water storage cavity, on the one hand to reduce its own temperature, and on the other hand to utilize the heat; However, the heat exchange pipe is in water for a long time, and when the water source in the water storage tank flows outside the heat exchange pipe, the hardness ions (Ca 2+ , Mg 2+ , HCO3 - ) in the water are supersaturated and precipitated, forming a CaCO3 scale layer on the outer wall of the heat exchange pipe, and as the scale accumulates, the thermal resistance increases, affecting the heat exchange efficiency of the heat exchange pipe. Because the overall shape of the heat exchange pipe is curved and composed of multiple pipes, it is not convenient to clean. SUMMARY

[0003] In view of the above problems existing in the prior art power plant cooling water waste heat recovery and utilization device, the present application is proposed.

[0004] The above technical problems are solved by the following technical scheme: the present application provides a power plant cooling water waste heat recovery and utilization device, comprising, a cylinder; at least two hot water pipes, the two hot water pipes are divided into a water inlet section and a water outlet section, wherein the water inlet section is installed at the top end of the cylinder, and the water outlet section is installed at the bottom end of the cylinder; at least two water collecting rings, the two water collecting rings are respectively installed at the top end and the bottom end inside the cylinder, and the two water collecting rings are connected in communication by a plurality of heat exchange pipes; a scale cleaning part, comprising a cleaning belt, the cleaning belt is wrapped outside the heat exchange pipe through a limiting frame, and the cleaning belt is driven by a driving mechanism, the driving mechanism has a driving force for driving the cleaning belt to adhere to the circumferential transmission of the heat exchange pipe and a linear displacement force for driving the cleaning belt to move along the radial direction of the heat exchange pipe.

[0005] In a preferred embodiment of the power plant cooling water waste heat recycling device, the space inside the cylinder is a water storage cavity, and the outer side of the cylinder is provided with inlet / outlet water pipes communicating with the water storage cavity.

[0006] In a preferred embodiment of the power plant cooling water waste heat recycling device, the limiting frame comprises two vertically opposite circular rings, the outer periphery of the two circular rings is provided with support rods, and the ends of the two vertically opposite support rods are rotationally connected with a guide rod. The outer periphery of the two circular rings is further provided with a main rod.

[0007] In a preferred embodiment of the power plant cooling water waste heat recycling device, a guide column is arranged at the center of the two circular rings, and the guide column is vertically arranged to guide the displacement of the cleaning belt on the upper / lower position.

[0008] In a preferred embodiment of the power plant cooling water waste heat recycling device, the guide rods are located at the bending nodes of the cleaning belt to ensure that the cleaning belt is wrapped around the surface of the heat exchange pipe.

[0009] In a preferred embodiment of the power plant cooling water waste heat recycling device, the driving mechanism comprises a rotating assembly and a displacement assembly. The rotating assembly provides circumferential transmission of the cleaning belt to realize wiping and cleaning of the dirt on the surface of the heat exchange pipe. The displacement assembly provides vertical displacement of the cleaning belt to realize segmented cleaning of the heat exchange pipe in the radial direction in cooperation with the circumferential movement.

[0010] In a preferred embodiment of the power plant cooling water waste heat recycling device, the rotating assembly comprises a transmission shaft penetrating through the two main rods and a driven gear fixed to the transmission shaft, one side of the driven gear is meshingly connected with a driving gear, the center of the driving gear is vertically penetrated by a transmission rod, and the transmission rod is driven by a driving member.

[0011] In a preferred embodiment of the power plant cooling water waste heat recycling device, the displacement assembly comprises a support rod sleeved outside the guide column, and the other end of the support rod is provided with a connecting ring sleeved outside the transmission rod. The outer periphery of the transmission rod is provided with a cam groove, and the inner side of the connecting ring is provided with a protrusion, the protrusion is located in the cam groove, and when the transmission rod rotates, the cam groove rotates synchronously, and due to the circumferential limitation of the connecting ring, the protrusion forces the displacement of the connecting ring in the rotation direction of the cam groove.

[0012] In a preferred embodiment of the power plant cooling water waste heat recycling device, the support rod is fixed near the bottom of the circular ring, and when the support rod moves vertically along the guide column, the cleaning belt moves up and down synchronously.

[0013] In a preferred embodiment of the power plant cooling water waste heat recycling device, a filtering part is installed on the hot water pipe inlet section to filter the hot water and prevent impurities from blocking the heat exchange pipe.

[0014] The power plant cooling water waste heat recycling device has the following advantages: the double driving force of the driving mechanism enables the cleaning belt to move along the circumference of the heat exchange pipe and move radially, tightly adhering to the outer wall of the curved and multiple parallel heat exchange pipes, scraping off the CaCO3 scale layer of each pipe section, solving the cleaning problem of complex structure heat exchange pipes, and avoiding dirt adhering to the outer wall of the heat exchange pipe, which increases the thermal resistance and reduces the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] To make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application. Among them: Figure 1 A perspective view of the power plant cooling water waste heat recycling device is shown. Figure 2 A cross-sectional view of the cylinder in the power plant cooling water waste heat recycling device is shown. Figure 3 A structure diagram of the dirt cleaning part in the power plant cooling water waste heat recycling device is shown. Figure 4 A structure diagram of the limiting frame in the power plant cooling water waste heat recycling device is shown. Figure 5 A structure diagram of the driving mechanism in the power plant cooling water waste heat recycling device is shown. Figure 6 A structure diagram of the filtering part in the power plant cooling water waste heat recycling device is shown. DETAILED DESCRIPTION

[0016] To make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application. Among them:

[0017] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions regarding the present application, but the terms can be changed according to the intention of those of ordinary skill in the art, precedents, or new technology in the art. Also, specific terms can be selected by the applicant, and in this case, the detailed meaning thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meaning of the terms and the general description of the present application.

[0018] Referring to Figures 1-2 The embodiment provides a power plant cooling water waste heat recycling device, comprising, A cylinder 1, the space inside the cylinder 1 is a water storage cavity, and the outer side of the cylinder 1 is respectively provided with an inlet / outlet water pipe communicating with the water storage cavity; At least two hot water pipes 11, the two hot water pipes 11 are divided into an inlet section and an outlet section, wherein the inlet section is installed at the top end axis of the cylinder 1, and the outlet section is installed at the bottom end axis of the cylinder 1; At least two water collecting rings 12, the two water collecting rings 12 are respectively installed at the top end and the bottom end inside the cylinder 1, and the two water collecting rings 12 are communicated by a plurality of heat exchange pipes 13; It should be noted that: a thermal power plant usually needs cooling water to cool the heat generated in the power generation process, because the combustion and steam generation in the power generation process will generate a large amount of waste heat, if not cooled, the waste heat will cause the equipment to overheat, the efficiency to decrease, and even the equipment to be damaged, therefore, in order to maintain the normal operation of the thermal power plant and ensure the efficiency of the power generation equipment, the waste heat needs to be cooled, and high-temperature cooling water is usually used to preheat the water used in the thermal power plant; When preheating, the high-temperature cooling water enters the heat exchange pipe 13 from the inlet section of the hot water pipe 11, and when the high-temperature cooling water passes through the heat exchange pipe 13, the heat will be transferred to the water source in the water storage cavity, on the one hand to reduce the temperature itself, and on the other hand to utilize the heat; However, the heat exchange pipe 13 is in water for a long time, and when the water source in the water storage tank flows outside the heat exchange pipe 13, the hardness ions (Ca 2+ , Mg 2+ , HCO3 - ) in the water are oversaturated and precipitated, forming a CaCO3 scale layer on the outer wall of the heat exchange pipe 13, and as the scale accumulates, the thermal resistance increases, affecting the heat exchange efficiency of the heat exchange pipe 13, and since the overall shape of the heat exchange pipe 13 is curved and composed of multiple roots, it is not convenient to clean.

[0019] Further, the dirt cleaning part 2 comprises a cleaning belt 21, which is wrapped outside the heat exchange pipe 13 through a limiting frame 22, and the cleaning belt 21 is driven through a driving mechanism 23, which has a driving force for driving the cleaning belt 21 to move along the circumference of the heat exchange pipe 13 and a linear displacement force for driving the cleaning belt 21 to move along the radial direction of the heat exchange pipe 13.

[0020] The design can realize the circumferential transmission and radial movement of the cleaning belt 21 along the heat exchange pipe 13 through the double driving force provided by the driving mechanism 23, and the cleaning belt 21 can be tightly attached to the outer wall of the heat exchange pipe 13, which can scrape off the attached CaCO3 scale layer through the circumferential transmission, reduce the thermal resistance of the heat exchange pipe 13, and ensure the heat exchange efficiency.

[0021] As an optional embodiment: Referring to Figures 3-6 In an embodiment provided by the present application, the limiting frame 22 comprises two vertically opposite circular rings 221, the outer periphery of the two circular rings 221 is provided with a support rod 222, the end portions of the two support rods 222 opposite to each other are rotationally connected with a guide rod 223, and the outer periphery of the two circular rings 221 is further provided with a main rod 224. Specifically, the distance between the two circular rings 221 is the thickness of the cleaning belt 21, and the end portion of the support rod 222 can constrain the cleaning belt 21 to ensure that the circular ring 221 can drive the cleaning belt 21 to move synchronously when the circular ring 221 moves up / down.

[0022] The axial center of the two circular rings 221 is penetrated by a guide column 225, which is vertically arranged and used for guiding when the circular ring 221 drives the cleaning belt 21 to move up / down.

[0023] Specifically, the two ends of the guide column 225 are fixed between the two water collecting rings 12, and the outer periphery of the guide column 225 is provided with a spline along the radial direction thereof, and the inner side of the circular ring 221 is provided with a key groove, and the spline is movably arranged in the key groove, which can avoid the circumferential rotation of the circular ring 221.

[0024] The guide rod 223 is located at the bending node of the cleaning belt 21, which is used for ensuring that the cleaning belt 21 is wrapped on the surface of the heat exchange pipe 13 to improve the cleaning efficiency.

[0025] The driving mechanism 23 comprises a rotating assembly 231 and a displacement assembly 232. The rotating assembly 231 gives the circumferential transmission of the cleaning belt 21, which realizes the wiping and cleaning of the dirt on the surface of the heat exchange pipe 13. The displacement assembly 232 gives the vertical displacement of the cleaning belt 21, which realizes the segmented cleaning of the heat exchange pipe 13 along the radial direction in cooperation with the circumferential movement.

[0026] The rotating assembly 231 comprises a transmission shaft 2311 penetrating through the two main rods 224 and a driven gear 2312 fixed on the transmission shaft 2311, one side of the driven gear 2312 is engaged with a driving gear 2313, and a transmission rod 2314 is vertically arranged at the shaft center of the driving gear 2313, which is driven by a driving member 2315.

[0027] Specifically, the two ends of the transmission shaft 2311 are rotatably installed at the top end and the bottom end inside the cylinder 1, and the transmission shaft 2311 is located at the inner side of the cleaning belt 21 and forms a tension with the cleaning belt 21, and when the transmission shaft 2311 rotates, it drives the cleaning belt 21 to rotate by friction. The driving member 2315 is a servo motor, which has the functions of forward / reverse rotation.

[0028] The displacement assembly 232 comprises a support rod 2321 sleeved on the outside of the guide column 225, the other end of the support rod 2321 is provided with a connecting ring 2322 sleeved on the outside of the transmission rod 2314, the outer periphery of the transmission rod 2314 is provided with a cam groove 2323, the inner side of the connecting ring 2322 is provided with a protrusion, the protrusion is located in the cam groove 2323, when the transmission rod 2314 rotates, the cam groove 2323 rotates synchronously, and since the connecting ring 2322 is limited in the circumferential direction, it is forced to move up / down along the rotation direction of the cam groove 2323 under the action of the protrusion, the support rod 2321 is fixed to the bottom of the annular ring 221 close to the bottom, and when the support rod 2321 moves vertically along the guide column 225, it drives the cleaning belt 21 to move up / down synchronously.

[0029] Specifically, the cleaning belt 21 is made of rubber, and the inner side of the rubber is provided with a metal elastic sheet, which has good shaping effect and effectively increases the overall toughness of the cleaning belt 21, avoiding the deformation and stretching caused by friction when the cleaning belt 21 moves vertically along the radial direction of the heat exchange pipe 13. The inner side of the cleaning belt 21 is provided with short bristles 221 at equal intervals, the short bristles 221 are made of nylon material, which has the advantages of good wear resistance and high cleaning efficiency, the short bristles 221 are in contact with the surface of the heat exchange pipe 13, so that the cleaning belt 21 is not attached to the surface of the heat exchange pipe 13, effectively reducing the friction, avoiding the interference problem caused by excessive friction when the cleaning belt 21 moves vertically along the radial direction of the heat exchange pipe 13, and ensuring that the cleaning belt 21 can move not only circumferentially but also radially along the heat exchange pipe 13 under the driving of the driving mechanism 23.

[0030] Working principle The servo motor is started first to drive the transmission rod 2314 to rotate. The servo motor rotates at a low speed. The driving gear 2313 on the transmission rod 2314 meshes with the driven gear 2312 and the transmission shaft 2311 to rotate. Since the transmission shaft 2311 and the cleaning belt 21 have a tension therebetween, the rotation of the transmission shaft 2311 drives the cleaning belt 21 to rotate along the heat exchange pipe 13 by friction. The circular ring 221 of the limiting frame 22 is prevented from rotating by the cooperation of the inner key groove and the spline of the guide column 225. The short brush 211 on the inner side of the cleaning belt 21 is attached to the surface of the heat exchange pipe 13 to wipe the surface in the circumferential direction. Secondly, when the transmission rod 2314 rotates, the cam groove 2323 on the outer periphery of the transmission rod 2314 rotates synchronously. The protrusion on the inner side of the connecting ring 2322 is embedded in the cam groove 2323 and is circumferentially constrained. The protrusion is forced to move up and down reciprocatingly under the action of the cam groove 2323. The limiting frame 22 and the cleaning belt 21 are driven by the support rod 2321 to move vertically along the guide column 225. The guide column 225 is located at the bending node of the cleaning belt 21, and always ensures that the short brush 211 on the inner side of the cleaning belt 21 is attached to the heat exchange pipe 13. The design realizes cleaning of the full surface of the curved and multiple parallel heat exchange pipes 13 through the cooperative action of two kinds of movements, solves the cleaning problem, and effectively reduces the thermal resistance. The mechanical linkage of the limiting frame 22 and the driving mechanism 23 has the characteristics of movement synchronization and sensitive response.

[0031] As an optional embodiment: With reference to Figure 6 In an embodiment provided in the present application, a filtering part 3 is further included, which is installed on the water inlet section of the hot water pipe 11 and used for filtering hot water to avoid impurities from blocking the heat exchange pipe 13.

[0032] Specifically, the filtering part 3 includes a box body 31, and at least three layers of filter screens 32 are arranged in the box body 31. A box door is bolted to the front side of the box body 31, and a sealing ring is arranged between the box body 31 and the box door. The box door can make the box body 31 be easily opened, thereby facilitating maintenance or replacement of the filter screens 32. The three layers of filter screens 32 are used for filtering water source to avoid impurities from blocking the heat exchange pipe 13, thereby affecting the water flow rate and heat exchange rate.

[0033] Finally, it should be pointed out that the methods and devices in the above detailed description are only embodiments, and those skilled in the art can modify the embodiments in different ways without departing from the scope of the present application.

Claims

1. A power plant cooling water waste heat recovery and utilization device, characterized by: The utility model relates to a kind of heat exchange tube cleaning device, including, cylinder (1); At least two hot water pipes (11), two The hot water pipe (11) is divided into water inlet section and water outlet section, wherein water inlet section is installed at the top end axis of cylinder (1), and water outlet section is installed at the bottom end axis of cylinder (1); At least two water collecting rings (12), two The water collecting ring (12) is installed at the top end and bottom end inside cylinder (1), and the water collecting ring (12) is connected between two by several heat exchange pipes (13); Dirt cleaning part (2), including cleaning belt (21), the cleaning belt (21) is covered on the outside of heat exchange pipe (13) by limiting frame (22), and cleaning belt (21) is driven by driving mechanism (23), the driving mechanism (23) has the driving force of driving cleaning belt (21) to adhere to the circumferential transmission of heat exchange pipe (13) and the linear displacement force of driving cleaning belt (21) along the radial movement of heat exchange pipe (13).

2. The power plant cooling water waste heat recovery and utilization device according to claim 1, characterized by: The space inside the cylinder (1) is a water storage cavity, and the outside of the cylinder (1) is respectively provided with inlet / outlet water pipes communicating with the water storage cavity.

3. The power plant cooling water waste heat recovery and utilization device according to claim 2, characterized by: The limiting frame (22) includes two vertically opposite circular rings (221), and the outer periphery of the two circular rings (221) is provided with a support rod (222), and the two support rods (222) are rotatably connected by a guide rod (223) between the upper and lower ends of the two support rods (222). The outer periphery of the two circular rings (221) is also provided with a main rod (224).

4. The power plant cooling water waste heat recovery and utilization device according to claim 3, characterized by: The axis of the two circular rings (221) penetrates a guide column (225), and the guide column (225) is vertically arranged to guide the upward / downward displacement of the cleaning belt (21) driven by the circular rings (221).

5. The power plant cooling water waste heat recovery device according to claim 4, characterized by: The guide rod (223) is located at the bending node of the cleaning belt (21) to ensure that the cleaning belt (21) is wrapped around the surface of the heat exchange pipe (13).

6. The power plant cooling water waste heat recovery device according to claim 5, characterized by: The driving mechanism (23) includes a rotating assembly (231) and a displacement assembly (232). The rotating assembly (231) drives the circumferential transmission of the cleaning belt (21) to wipe and clean the dirt on the surface of the heat exchange pipe (13). The displacement assembly (232) drives the vertical displacement of the cleaning belt (21) to realize the segmented cleaning of the heat exchange pipe (13) in the radial direction.

7. The power plant cooling water waste heat recovery device according to claim 6, characterized by: The rotating assembly (231) includes a transmission shaft (2311) penetrating the two main rods (224) and a driven gear (2312) fixed to the transmission shaft (2311), one side of the driven gear (2312) is engaged with a driving gear (2313), the axis of the driving gear (2313) is vertically penetrated by a transmission rod (2314), and the transmission rod (2314) is driven by a driving member (2315).

8. The power plant cooling water waste heat recovery device according to claim 7, characterized by: The displacement assembly (232) includes a support rod (2321) sleeved outside the guide column (225), and the other end of the support rod (2321) is provided with a connecting ring (2322) sleeved outside the transmission rod (2314). The outer periphery of the transmission rod (2314) is provided with a cam groove (2323), and the inner side of the connecting ring (2322) is provided with a protrusion located in the cam groove (2323); when the transmission rod (2314) rotates, the cam groove (2323) rotates synchronously; due to the circumferential limitation of the connecting ring (2322), the protrusion forces the connecting ring (2322) to move up / down along the rotation direction of the cam groove (2323).

9. The power plant cooling water waste heat recovery device according to claim 8, characterized by: The support rod (2321) is fixed to the bottom of the circular ring (221) close to the lower side; when the support rod (2321) moves vertically along the guide column (225), the cleaning belt (21) moves up / down synchronously.

10. The power plant cooling water waste heat recovery device according to claim 1, characterized by: The filter part (3) is installed on the water inlet section of the hot water pipe (11) and is used for filtering hot water to avoid impurities from blocking the heat exchange pipe (13).

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