A high-efficiency energy-saving circulating cooling device

Abstract

The utility model provides a kind of efficient energy-saving circulating cooling device, including main circulation loop, secondary circulation loop and a key coaxial multi-chamber heat exchanger.The first chamber, the second chamber and the third chamber are sequentially separated by two partition plates in the heat exchanger shell, and multiple heat exchange tubes penetrate the first and second chambers.Because the adjusting mechanism with the gate piece is set, the gate piece controls the conduction degree of the heat exchange tube at the end of the first chamber by sliding, thereby dynamically changing the effective heat exchange area, to adjust the temperature of the secondary circulation loop cooling water flowing through the heat exchange tube.This temperature control method by physically changing the heat exchange area is lower in energy consumption compared to traditional variable frequency pump speed regulation, achieving significant energy saving.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration power generation technology, specifically to a high-efficiency and energy-saving circulating cooling device. Background Technology

[0002] In the process of municipal solid waste incineration, the circulating cooling system is one of the key pieces of equipment. It is mainly used for cooling the grate, steam turbine condenser, flue gas, and other auxiliary equipment. In practice, multiple circulating cooling loops are usually set up according to the characteristics of the equipment. The circulating cooling loop used to cool equipment with relatively high heat generation and strong heat dissipation requirements, such as the grate and steam turbine condenser, is called the main circulating loop. The circulating cooling loop used for flue gas cooling and auxiliary equipment cooling, which have relatively lower heat generation and weaker heat dissipation requirements, is called the secondary circulating loop. The cooling of some parts or equipment in the secondary circulating loop, such as flue gas cooling, has certain requirements on the temperature of the cooling water: it must be kept below a certain level to ensure cooling efficiency, and above a certain level to prevent acidic gas components in the flue gas from condensing and corroding the equipment. Controlling the cooling water temperature consumes a lot of energy, affecting the economic efficiency of the generator set operation. Utility Model Content

[0003] This invention provides a highly efficient and energy-saving circulating cooling device, which improves upon the problem of high energy consumption in regulating the cooling water temperature in the secondary circulation loop in the prior art, thereby reducing energy consumption.

[0004] To achieve the above objectives, this utility model provides a high-efficiency and energy-saving circulating cooling device, including a main circulation loop and a secondary circulation loop, and further comprising:

[0005] A heat exchanger includes a shell, heat exchange tubes, and an adjusting mechanism. Two partition plates are axially spaced within the shell, dividing the interior into a first chamber, a second chamber, and a third chamber arranged sequentially along the shell's axial direction. The heat exchange tubes extend from the first chamber to the second chamber, with a gap between the end of each tube and the inner wall of the shell. Multiple heat exchange tubes are arranged radially at intervals. The adjusting mechanism includes a gate plate located in the first chamber and slidably positioned at the end of each heat exchange tube, used to control the conductivity of the heat exchange tubes.

[0006] The outlet pipe of the main circulation loop is connected to the second chamber;

[0007] The inlet pipe of the secondary circulation loop is connected to the first chamber and to the third chamber via the heat exchange pipe. After the main circulation loop cools the grate and the steam turbine condenser, cooling water carrying a significant amount of heat is injected into the second chamber and flows out along the outlet pipe. Before cooling, the cooling water in the secondary circulation loop passes sequentially through the first chamber, the heat exchange pipe, and the third chamber. Through the heat exchange pipe, the cooling water in the main circulation loop transfers heat to the secondary circulation loop, thereby increasing the water temperature in the secondary circulation loop. The dam can control the conductivity of at least a portion of the heat exchange pipes. Heat exchange pipes with a conductivity below a certain level cannot allow cooling water from the secondary circulation loop to pass through and exchange heat. This essentially changes the heat exchange area of ​​the heat exchanger, thus altering the temperature of the cooling water reaching the third chamber. This adjustment method consumes less energy than frequency conversion control of the pump.

[0008] As an optional technical solution, the axial cross-section of the housing at the adjustment mechanism includes a first region and a second region, wherein the first region is closer to the center of the cross-section than the second region, and the projection of the heat exchange tube on the cross-section is located in the first region;

[0009] The gate includes a gate plate and a rotating shaft. The rotating shaft is rotatably disposed, and its projection on the cross-section is located in the second region. The gate plate is slidably disposed at the end of the heat exchange tube. The surface of the gate plate facing away from the heat exchange tube is connected to the rotating shaft, and the projection of the gate plate on the cross-section extends from the second region to the first region. There are multiple gates, and the rotating shafts of the multiple gates are spaced apart circumferentially along the housing. When it is necessary to increase the temperature of the cooling water in the secondary circulation loop, the gate plate rotates towards the second region, reducing the number of heat exchange tubes blocked in the first region, thereby increasing the heat exchange area and heat exchange efficiency of the heat exchanger, and thus increasing the heat obtained by the cooling water in the secondary circulation loop.

[0010] As an optional technical solution, the adjusting mechanism further includes a transmission belt and a drive assembly. The transmission belt sequentially wraps around all the rotating shafts and is connected to them. The drive assembly is connected to the transmission belt and is used to drive the rotating shafts to rotate via the transmission belt. The transmission belt allows the same drive assembly to control the rotation of all the brake plates, which simplifies the structure of the adjusting mechanism.

[0011] As an optional technical solution, the housing includes a first sub-part and a second sub-part, which are detachably connected. The first sub-part has a first chamber, and the second sub-part has a second chamber.

[0012] The adjusting mechanism further includes a mounting ring, which is disposed at the connection between the first sub-part and the second sub-part. The end of the mounting ring facing away from the second sub-part has an annular mounting groove. The gate is disposed on the side of the mounting ring near the second sub-part, and the rotating shaft passes through the mounting groove. The transmission belt is disposed within the mounting groove. One end of the drive assembly is connected to the transmission belt, and the other end passes radially through the mounting ring to the outside of the mounting ring. The opening of the mounting groove is detachably fitted with a sealing cap. Because the transmission belt and part of the drive assembly are disposed within the mounting groove, and the opening of the mounting groove is sealed, cooling water in the first chamber is difficult to penetrate into the mounting groove, thus the mounting ring protects the transmission belt and other components within the mounting groove.

[0013] As an optional technical solution, the adjusting mechanism further includes a tensioning component. One end of the tensioning component abuts against the side of the transmission belt away from the rotating shaft, and the other end extends radially through the mounting ring to the outside of the mounting ring and is slidably connected to the mounting ring. The tensioning component can tension the transmission belt, maintain its connection with the rotating shaft, and prevent slippage or tooth skipping.

[0014] As an optional technical solution, reinforcing ribs are embedded inside the gate plate in a direction opposite to the rotating shaft. When no water is injected into the first chamber, the gate plate warps away from the partition plate due to gravity. The reinforcing ribs can limit the warping amplitude of the gate plate, which helps to prevent excessive deformation of the gate plate from causing a decrease in the sealing performance of the heat pipe.

[0015] As an optional technical solution, an air bladder is provided at the end of the gate away from the rotating shaft. After the secondary circulation loop injects cooling water into the first chamber, the air bladder, under the action of buoyancy, can provide a force towards the heat exchange tube for the gate, thereby promoting the contact between the gate and the heat exchange tube.

[0016] As an optional technical solution, the third chamber includes a water outlet with a gate at the outlet. When the gate closes a certain number of the heat-conducting tubes, because the pressure in the first chamber is greater than that in the third chamber, the gate will be pressed against the end of the heat exchange tube by the water pressure, making it difficult for the gate to rotate and for the heat exchange area of ​​the heat exchanger to be adjusted. By reducing the opening of the gate, the pressure in the third chamber can be increased, thereby reducing the pressure difference between the third chamber and the first chamber, making the gate easier to rotate.

[0017] As an optional technical solution, a temperature sensor is provided at the water outlet, and the temperature sensor signal is connected to the regulating mechanism.

[0018] As an optional technical solution, the regulating mechanism includes an air pump and a pressure relief valve. The air pump is connected to the third chamber, and the pressure relief valve is connected to the first chamber. The air pump and the pressure relief valve can reduce the pressure difference between the third chamber and the first chamber, making the brake plate easier to rotate.

[0019] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0020] This invention provides a highly efficient and energy-saving circulating cooling device, including a main circulation loop, a secondary circulation loop, and a key coaxial multi-chamber heat exchanger. The heat exchanger shell is divided into a first chamber, a second chamber, and a third chamber by two partition plates, with multiple heat exchange tubes passing through the first and second chambers. Due to the inclusion of a gate-type regulating mechanism, the gate slides to control the conductivity of the heat exchange tubes at the first chamber end, thereby dynamically changing the effective heat exchange area and thus regulating the temperature of the cooling water flowing through the heat exchange tubes in the secondary circulation loop. This method of temperature control by physically changing the heat exchange area consumes significantly less energy than traditional variable frequency pump speed regulation, achieving substantial energy savings. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0022] Figure 1 This is a schematic diagram of the high-efficiency and energy-saving circulating cooling device of this utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the mounting ring in the middle;

[0024] Figure 3 for Figure 2 A schematic diagram of the interior of the mounting slot.

[0025] Explanation of reference numerals in the attached figures

[0026] Main loop -200; Secondary loop -300;

[0027] Shell-1; partition plate-11; first chamber-12; second chamber-13; third chamber-14;

[0028] Heat exchanger tube-2;

[0029] Brake pad-31; Brake plate-311; Rotating shaft-312; Transmission belt-32; Drive assembly-33; Mounting ring-34; Mounting groove-341; Cover-342; Tensioning assembly-35. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In this invention, the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can be a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] Example 1

[0036] This embodiment provides a high-efficiency and energy-saving circulating cooling device, including a main circulation loop 200 and a secondary circulation loop 300, and further including:

[0037] The heat exchanger includes a shell 1, heat exchange tubes 2, and an adjustment mechanism. Two partition plates 11 are axially spaced inside the shell 1, dividing the interior of the shell 1 into a first chamber 12, a second chamber 13, and a third chamber 13 arranged sequentially along the axial direction of the shell 1. The heat exchange tubes 2 extend from the first chamber 12 to the second chamber 13, with a gap between the end of the heat exchange tube 2 and the inner wall of the shell 1. Multiple heat exchange tubes 2 are arranged radially spaced. The adjustment mechanism includes a gate 31, which is disposed in the first chamber 12 and slidably disposed at the end of the heat exchange tube 2. The gate 31 is used to control the conductivity of the heat exchange tube 2.

[0038] The outlet pipe of the main circulation loop 200 is connected to the second chamber 13;

[0039] The inlet pipe of the secondary circulation loop 300 is connected to the first chamber 12 and to the third chamber 13 via the heat exchange tube 2. After the main circulation loop 200 cools the grate and the steam turbine condenser, the cooling water carrying a large amount of heat is injected into the second chamber 13 and flows out along the outlet pipe. Before cooling, the cooling water in the secondary circulation loop 300 passes through the first chamber 12, the heat exchange tube 2, and the third chamber 13 in sequence. The cooling water in the main circulation loop 200 transfers heat to the secondary circulation loop 300 through the heat exchange tube 2, thereby increasing the water temperature in the secondary circulation loop 300. The gate 31 can control the conductivity of at least part of the heat exchange tube 2. If the conductivity of the heat exchange tube 2 is below a certain level, the cooling water in the secondary circulation loop 300 cannot pass through and exchange heat. This essentially changes the heat exchange area of ​​the heat exchanger, thereby changing the temperature of the cooling water reaching the third chamber 13. This adjustment method consumes less energy than frequency conversion control of the pump.

[0040] It should be noted that the heat exchanger should be installed vertically, with the first chamber 12 located at the bottom.

[0041] Example 2

[0042] Based on Embodiment 1, the axial cross-section of the shell 1 at the adjustment mechanism includes a first region and a second region. The first region is closer to the center of the cross-section than the second region, and the projection of the heat exchange tube 2 on the cross-section is located in the first region.

[0043] The gate 31 includes a gate plate 311 and a rotating shaft 312. The rotating shaft 312 is rotatably disposed, and its projection in cross-section is located in the second region. The gate plate 311 is slidably disposed at the end of the heat exchange tube 2. The surface of the gate plate 311 facing away from the heat exchange tube 2 is connected to the rotating shaft 312. The projection of the gate plate 311 in cross-section extends from the second region to the first region. There are multiple gate plates 31, and the rotating shafts 312 of the multiple gate plates 31 are spaced apart circumferentially along the shell 1. When it is necessary to increase the temperature of the cooling water in the secondary circulation loop 300, the gate plate 311 rotates toward the second region, reducing the number of heat exchange tubes 2 blocked in the first region, thereby increasing the heat exchange area and heat exchange efficiency of the heat exchanger, and thus increasing the heat obtained by the cooling water in the secondary circulation loop 300.

[0044] The gate 311 can be made of engineering plastics, carbon fiber or glass fiber, etc., and the shaft 312 can be made of steel alloy.

[0045] It should be noted that the gates 311 can overlap each other circumferentially along the first chamber 12, forming a structure similar to the shutter of a camera lens. This allows for a larger area of ​​gates 311 and a wider adjustment range for the adjustment assembly. A rubber ring or rubber end cap with a certain deformation capability can be provided at the end of the heat exchange tube 2 near the gates 311 to compensate for the gaps formed by the overlapping of the gates 311, thereby improving the sealing capability of the gates 311 over the heat exchange tube 2.

[0046] As an optional technical solution, the adjusting mechanism also includes a transmission belt 32 and a drive assembly. The transmission belt 32 sequentially wraps around all rotating shafts 312 and is connected to them. The drive assembly is connected to the transmission belt 32 and is used to drive the rotating shafts 312 to rotate via the transmission belt 32. The transmission belt 32 allows the same drive assembly to control the rotation of all brake pads 31, which simplifies the structure of the adjusting mechanism. Preferably, the transmission belt 32 is a synchronous belt, and the rotating shafts 312 are provided with teeth or connected to synchronous pulleys that mesh with the transmission belt 32.

[0047] Optionally, the drive assembly includes a drive wheel, a drive wheel shaft, and a drive member. The drive wheel and drive wheel shaft are disposed within the mounting groove 341. The drive wheel is connected to the transmission belt 32. The drive member is disposed outside the housing 1 and connected to the drive wheel shaft. In some embodiments, a worm gear is provided on the drive wheel shaft, and the drive member is connected to the worm gear via a worm. The worm extends radially from the mounting groove 341 along the mounting ring 34 to the outside of the mounting ring 34. In other embodiments, a bevel gear may be provided on the drive wheel shaft, and the drive member is connected to the drive wheel via a bevel gear shaft that meshes with it. The drive member can be an automated drive component such as a motor, or a manually driven component such as a handwheel.

[0048] As an optional technical solution, the housing 1 includes a first sub-part and a second sub-part, which are detachably connected. The first sub-part has a first chamber 12 and the second sub-part has a second chamber 13.

[0049] The adjusting mechanism also includes a mounting ring 34, which is located at the connection between the first sub-part and the second sub-part. The end of the mounting ring 34 facing away from the second sub-part has an annular mounting groove 341. A gate 311 is located on the side of the mounting ring 34 near the second sub-part, and a rotating shaft 312 passes through the mounting groove 341. A transmission belt 32 is located within the mounting groove 341. One end of the drive assembly is connected to the transmission belt 32, and the other end passes radially through the mounting ring 34 to the outside of the mounting ring 34. A detachable sealing cap 342 is provided at the opening of the mounting groove 341. Because the transmission belt 32 and part of the drive assembly are located in the mounting groove 341, and the opening of the mounting groove 341 is sealed with a cap 342, cooling water in the first chamber 12 is difficult to penetrate into the mounting groove 341, thus protecting the transmission belt 32 and other components within the mounting groove 341. The mounting ring 34, the first sub-part, and the second sub-part can be connected by flanges. Furthermore, any commonly used shaft end sealing method can be used at the connection between the rotating shaft 312 and the mounting ring 34, and this embodiment does not limit it.

[0050] As an optional technical solution, the adjustment mechanism also includes a tensioning assembly 35. One end of the tensioning assembly 35 abuts against the side of the transmission belt 32 opposite to the rotating shaft 312, and the other end extends radially through the mounting ring 34 to the outside of the mounting ring 34 and is slidably connected to the mounting ring 34. The tensioning assembly 35 can tension the transmission belt 32 and maintain its connection with the rotating shaft 312, preventing slippage or tooth skipping. The tensioning assembly 35 may include a tensioning wheel and an adjusting rod. The tensioning wheel abuts against the side of the transmission belt 32 opposite to the rotating shaft 312 and is rotatably connected to the adjusting rod. The adjusting rod passes through the mounting ring 34 and forms a threaded connection with the mounting ring 34. A locking nut can be installed on the side of the adjusting rod extending out of the mounting ring 34.

[0051] As an optional technical solution, reinforcing ribs are embedded inside the gate 311 in the direction away from the rotating shaft 312. When no water is injected into the first chamber 12, the gate 311 warps away from the partition plate 11 under the influence of gravity. The reinforcing ribs can limit the warping amplitude of the gate 311, which helps to prevent excessive deformation of the gate 311 from reducing the sealing performance of the heat pipe. The reinforcing ribs should be able to withstand a certain tensile force, and can be made of steel wire, nylon wire, etc.

[0052] As an optional technical solution, the end of the gate 311 facing away from the rotating shaft 312 is provided with an airbag. After the secondary circulation loop 300 injects cooling water into the first chamber 12, the airbag, under the action of buoyancy, can provide a force to the gate 311 toward the heat exchange tube 2, thereby promoting the contact between the gate 311 and the heat exchange tube 2.

[0053] As an optional technical solution, the third chamber 13 includes a water outlet, and a gate is provided at the water outlet. When the gate 311 closes a certain number of heat-conducting tubes, because the pressure in the first chamber 12 is greater than that in the third chamber 13, the gate 311 will be squeezed by the water pressure at the end of the heat exchange tube 2, making it difficult for the gate plate 31 to rotate and difficult to adjust the heat exchange area of ​​the heat exchanger; by reducing the opening of the gate, the pressure in the third chamber 13 can be increased, thereby reducing the pressure difference between the third chamber 13 and the first chamber 12, making the gate plate 31 easier to rotate.

[0054] As an optional technical solution, the regulating mechanism includes an air pump and a pressure relief valve. The air pump is connected to the third chamber 13, and the pressure relief valve is connected to the first chamber 12. The air pump and the pressure relief valve can reduce the pressure difference between the third chamber 13 and the first chamber 12, making the brake plate 31 easier to rotate.

[0055] As an optional technical solution, a temperature sensor is installed at the water outlet, and the temperature sensor signal is connected to the regulating mechanism.

[0056] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0057] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A high-efficiency and energy-saving circulating cooling device, comprising a main circulating loop and a secondary circulating loop, characterized in that, Also includes: A heat exchanger includes a shell, heat exchange tubes, and an adjusting mechanism. Two partition plates are axially spaced within the shell, dividing the interior into a first chamber, a second chamber, and a third chamber arranged sequentially along the shell's axial direction. The heat exchange tubes extend from the first chamber to the second chamber, with a gap between the end of each tube and the inner wall of the shell. Multiple heat exchange tubes are arranged radially at intervals. The adjusting mechanism includes a gate plate located in the first chamber and slidably positioned at the end of each heat exchange tube, used to control the conductivity of the heat exchange tubes. The outlet pipe of the main circulation loop is connected to the second chamber; The water inlet pipe of the secondary circulation loop is connected to the first chamber and to the third chamber through the heat exchange pipe.

2. The high-efficiency and energy-saving circulating cooling device according to claim 1, characterized in that, The shell has an axial cross-section at the adjustment mechanism comprising a first region and a second region, wherein the first region is closer to the center of the cross-section than the second region, and the projection of the heat exchange tube on the cross-section is located in the first region; The gate includes a gate plate and a rotating shaft. The rotating shaft is rotatably disposed, and the projection of the rotating shaft on the cross section is located in the second region. The gate plate is slidably disposed at the end of the heat exchange tube. The surface of the gate plate opposite to the heat exchange tube is connected to the rotating shaft. The projection of the gate plate on the cross section extends from the second region to the first region. There are multiple gates, and the rotating shafts of the multiple gates are spaced apart along the circumference of the housing.

3. The high-efficiency and energy-saving circulating cooling device according to claim 2, characterized in that, The adjustment mechanism further includes a transmission belt and a drive assembly. The transmission belt sequentially wraps around all the rotating shafts and is connected to the rotating shafts. The drive assembly is connected to the transmission belt and is used to drive the rotating shafts to rotate via the transmission belt.

4. The high-efficiency and energy-saving circulating cooling device according to claim 3, characterized in that, The housing includes a first sub-part and a second sub-part, which are detachably connected. The first sub-part contains a first chamber, and the second sub-part contains a second chamber. The adjustment mechanism further includes a mounting ring, which is disposed at the connection between the first sub-part and the second sub-part. The end of the mounting ring opposite to the second sub-part has an annular mounting groove. The gate is disposed on the side of the mounting ring near the second sub-part, and the rotating shaft passes through the mounting groove. The transmission belt is disposed in the mounting groove. One end of the drive assembly is connected to the transmission belt, and the other end passes radially through the mounting ring to the outside of the mounting ring. The opening of the mounting groove is detachably provided with a sealing cap.

5. The high-efficiency and energy-saving circulating cooling device according to claim 4, characterized in that, The adjustment mechanism also includes a tensioning component, one end of which abuts against the side of the transmission belt away from the rotating shaft, and the other end extends radially through the mounting ring to the outside of the mounting ring and is slidably connected to the mounting ring.

6. The high-efficiency and energy-saving circulating cooling device according to claim 2, characterized in that, The gate plate is equipped with reinforcing ribs embedded in the direction opposite to the rotating shaft.

7. The high-efficiency and energy-saving circulating cooling device according to claim 2, characterized in that, An airbag is provided at the end of the gate that is away from the rotating shaft.

8. The high-efficiency and energy-saving circulating cooling device according to claim 1, characterized in that, The third chamber includes a water outlet, and a gate is provided at the water outlet.

9. The high-efficiency and energy-saving circulating cooling device according to claim 8, characterized in that, A temperature sensor is installed at the water outlet, and the temperature sensor signal is connected to the regulating mechanism.

10. The high-efficiency and energy-saving circulating cooling device according to claim 1, characterized in that, The regulating mechanism includes an air pump and a pressure relief valve. The air pump is connected to the third chamber, and the pressure relief valve is connected to the first chamber.

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