Tail gas treatment device for cement production kiln

Abstract

The invention discloses a cement production kiln tail gas treatment device, and relates to the technical field of environmental protection, in particular to a cyclone separator body and a water tank arranged on the left side of the cyclone separator body, a cooling cylinder is arranged on the outer surface of the cyclone separator body, and an annular guide plate is arranged on the inner wall of the cooling cylinder; according to the cement production kiln tail gas treatment device, the cooling cylinder, the annular guide plate and the partition plate are arranged outside the cyclone separator body, a water circulation loop is constructed, and the stirring impeller is driven to rotate by utilizing steam to drive the fan blades. The effects of damaging a thermal boundary layer and improving the heat exchange efficiency are achieved, water efficiently absorbs heat, effective cooling of the cyclone separator body is achieved, meanwhile, a complete water circulation loop is formed, steam is recycled to the maximum extent through water flow and steam flowing in the same direction, and the energy utilization efficiency of the system is improved.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection technologies, and more specifically, to a device for treating the tail gas of a cement production kiln furnace. Background Art

[0002] Cement is a powdery hydraulic inorganic binder. After being mixed with water and stirred, it becomes a slurry, which can harden in the air or better harden in water, and can firmly cement materials such as sand and stone together. The early mixture of lime and pozzolan was very similar to modern lime-pozzolan cement. The concrete made by cementing broken stones with it not only has relatively high strength after hardening, but also can resist the erosion of fresh water or salt water. For a long time, as an important binder, it has been widely used in civil engineering, water conservancy, national defense and other projects;

[0003] Among them, the cement production kiln furnace is a key device for clinker calcination in the cement production process. Its main function is to heat the raw material to a high temperature (generally about 1450 °C), so that the raw material undergoes a series of physical and chemical changes, and finally forms cement clinker. However, a large amount of waste gas will be generated during the clinker calcination process of the cement production kiln furnace, because the cement production requires high-temperature calcination of the raw material. During this process, the combustion of fuels (such as coal), the decomposition of carbonates in the raw material, etc. will all generate waste gas. The main components of the waste gas include carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NO x )), carbon monoxide (CO), and a large amount of particulate matter, etc. Generally speaking, about 2000 - 3000 cubic meters of waste gas will be generated for every 1 ton of cement clinker produced;

[0004] To protect the earth's ecological environment, multi-stage treatment is usually carried out in the waste gas emission link of the cement production kiln furnace. In the primary treatment stage, the key work is to effectively filter the dust particles in the waste gas. Common treatment devices include cyclone separators, bag filters, and electrostatic precipitators, etc. They play a key role in purifying waste gas and reducing dust pollution;

[0005] In the current era background of attaching great importance to environmental protection and efficient energy utilization, the treatment of cement kiln flue gas has become a key topic in the industry. Taking the Chinese patent with the application number 202411471405.3 as an example, it discloses a dust separation device for treating cement kiln flue gas. This device uses a cyclone separator to separate the dust in the waste gas. This design follows the mature principle that the cyclone separator uses centrifugal force to separate dust from gas, and can effectively remove most of the dust particles in the waste gas, laying a good foundation for subsequent waste gas treatment.

[0006] Meanwhile, this device also has its own innovative improvements. Considering that the exhaust gas discharged from the cement kiln has a relatively high temperature, which will have an adverse impact on the performance and service life of the cyclone separator, based on the scientific principle of heat transfer, this patent sets a cooling component on the outer surface of the cyclone separator. Specifically, heat exchange is carried out between the water in the heat conduction tube and the cyclone separator to absorb its heat for the purpose of cooling. Moreover, the steam generated by water evaporation is further used for power generation. This measure conforms to the law of conservation of energy, can convert the heat energy that would otherwise be wasted into electrical energy, and significantly improves the energy recovery and utilization rate. From both theoretical and practical application perspectives, it has important energy-saving significance.

[0007] However, there are also some deficiencies in the design of this patent. During the actual operation process, since the water in the heat conduction tube does not have fluidity and an intermittent water addition method is adopted, there are often empty sections in the water in the heat conduction tube. According to the basic principle of heat conduction, the absence of water will destroy the continuous heat transfer medium, making it impossible for heat to be smoothly transferred from the cyclone separator to the water, thereby significantly reducing the heat exchange effect. In addition, from the patent description, the heat conduction tube is spirally downwardly arranged, with the water inlet end at the top and the gas outlet end at the bottom. When the water in the heat conduction tube is heated and evaporated into gas, the gas will tend to flow along the path with less resistance in the natural state. Since the pressure at the water inlet end is relatively low, most of the steam will enter the second water tank along the path of the heat conduction tube from the water inlet end, and the amount of steam that can enter the recovery tube two at the bottom of the heat conduction tube for power generation is extremely small. According to the theory of energy conversion, the reduction in the amount of steam directly means a reduction in the energy available for power generation, resulting in a significant discount in the energy recovery and utilization rate of this device and being unable to fully achieve the original intention of its energy-saving design; Summary of the Invention

[0008] In view of the deficiencies of the prior art, the present invention provides a device for treating the tail gas of a cement production kiln, which solves the problems raised in the above-mentioned background technology.

[0009] The technical solution of the present invention is as follows:

[0010] To achieve the above object, the present invention is realized through the following technical solutions: A device for treating the tail gas of a cement production kiln includes a cyclone separator body and a water tank arranged on the left side of the cyclone separator body. A cooling cylinder is arranged on the outer surface of the cyclone separator body, and an annular guiding plate is arranged on the inner wall of the cooling cylinder and sleeved on the outer surface of the cyclone separator body, thereby forming a spiral downward annular channel on the outer surface of the cyclone separator body. A partition plate capable of dividing the annular channel into a cooling channel and a steam channel is arranged in the annular channel;

[0011] A plurality of stirring wheels capable of rotating on the outer peripheral surface of the cyclone separator body are evenly arranged in the cooling channel, and a driving component capable of providing power to the stirring wheels is arranged in the steam channel. A plurality of driving belts are evenly fixedly connected to one side of the stirring wheel away from the cyclone separator body, and one end of the driving belt away from the cyclone separator body is fixedly connected to a driving circular plate. The side of the driving circular plate away from the cyclone separator body is fixedly connected to the driving component.

[0012] Preferably, the driving component includes a plurality of rotating shafts evenly rotatably connected to the partition plate. One end of the rotating shaft extends into the cooling channel and is fixedly connected to the driving circular plate, and the other end of the rotating shaft extends into the steam channel and is fixedly connected to a wind blade.

[0013] Preferably, a limiting cylinder with one end rotatably connected to the cyclone separator body is fixedly connected to one side of the stirring wheel close to the cyclone separator body.

[0014] Preferably, a water inlet pipe communicating with the bottom end of the cooling cylinder is arranged at the front end of the water tank, and the water outlet end of the water inlet pipe is communicated with the bottom end of the cooling channel. A water pump for supplying water into the cooling channel through the water inlet pipe is arranged in the water tank. The top end of the cooling cylinder is provided with a water outlet pipe communicating with the rear end of the water tank, and the inlet of the water outlet pipe is communicated with the top end of the cooling channel. An air inlet pipe is arranged on the upper surface of the water tank, and one end of the air inlet pipe away from the water tank is communicated with the top end of the steam channel. The bottom end of the cooling cylinder is provided with an air outlet pipe, and the inlet of the air outlet pipe is communicated with the bottom end of the steam channel.

[0015] Preferably, the stirring wheel is composed of three stirring impellers, and a driving guide cylinder is arranged between adjacent two stirring impellers. One end of the driving guide cylinder close to the cyclone separator body is fixedly connected to one stirring impeller, and the other end of the driving guide cylinder is slidably connected to another adjacent stirring impeller.

[0016] Preferably, a driven shaft is fixedly connected to the stirring impeller farthest from the cyclone separator body. One end of the driven shaft close to the cyclone separator body sequentially penetrates through the other two stirring impellers and extends into the cyclone separator body, and the end of the driven shaft away from the stirring impeller can rotate and slide back and forth in the cyclone separator body.

[0017] Preferably, an installation limiting groove is formed on the outer peripheral surface of the cyclone separator body. The end of the driven shaft away from the stirring impeller is movably connected to the installation limiting groove. A limiting plate is rotatably connected to one end of the driven shaft close to the cyclone separator body, and the limiting plate is slidably connected to the installation limiting groove. A tension spring with one end arranged in the installation limiting groove is fixedly connected to the side of the limiting plate away from the driven shaft.

[0018] Preferably, auxiliary guiding plates capable of forming slopes are provided on the blades of the second and third stirring impellers away from the cyclone separator body in sequence, and the blades of each stirring impeller are hollow. A limiting barrel capable of deforming the auxiliary guiding plate is arranged inside the blade of each stirring impeller, and each limiting barrel corresponds to the position of the driving guiding cylinder adapted thereto one by one, and one end of the driving guiding cylinder is slidably connected inside the corresponding limiting barrel.

[0019] Preferably, a second slope is provided at the position on the blade of the stirring impeller covered by the auxiliary guiding plate, so that a storage space is formed between the auxiliary guiding plate and the second slope, and the storage space is communicated with the limiting barrel.

[0020] Preferably, a second communication port is provided at the bottom end of the limiting barrel, a first communication port is provided on the inner wall of the blade of the stirring impeller, sealing plates are fixedly connected to the circumferential two ends of the outer peripheral surface of the limiting barrel close to the second communication port, and the ends of the two sealing plates away from the limiting barrel are respectively fixedly connected to the inner wall of the blade on the stirring impeller.

[0021] Beneficial effects

[0022] The present invention provides a cement production kiln tail gas treatment device, which has the following beneficial effects:

[0023] 1. For this cement production kiln tail gas treatment device, by arranging a cooling cylinder, an annular guiding plate and a partition plate outside the cyclone separator body, a water circulation loop is constructed, and the steam is used to drive the wind blades to drive the stirring impeller to rotate. The effects of destroying the thermal boundary layer and improving the heat exchange efficiency are achieved, so that the water can efficiently absorb heat, effectively cool the cyclone separator body, and at the same time form a complete water circulation loop. The co-directionally flowing water flow and steam also realize the maximum recovery and utilization of steam, and improve the energy utilization efficiency of the system.

[0024] 2. For this cement production kiln tail gas treatment device, by setting the stirring wheel as three stirring impellers and using structures such as driving guiding cylinders, driven shafts, limiting plates and tension springs, intelligent adjustment according to the change of tail gas temperature is realized. The effects of reasonably adjusting the rotation speed and spacing of the stirring impeller under different tail gas temperature conditions are achieved, so that the water with significant temperature differences in different regions can be fully mixed, the thermal boundary layer can be broken, the heat exchange efficiency can be improved, and the stability and repeatability of the system operation can be ensured, realizing the maximization of energy utilization efficiency.

[0025] 3. The cement production kiln tail gas treatment device forms a connected air flow channel by setting auxiliary guide plates, limit barrels, sealing plates and other components on some stirring impeller blades. The auxiliary guide plates can form or restore the slope according to the change of the stirring impeller spacing. When rotating, it can push the water away from the cyclone separator body to move closer to the body, enhance the mixing effect of water, break the thermal boundary layer, and further improve the heat exchange efficiency of the heat exchange system.

[0026] 4. The cement production kiln tail gas treatment device, by setting a cooling cylinder, annular guide plate and partition plate outside the cyclone separator body to construct a water circulation loop, uses steam to drive the fan blade to drive the stirring impeller to rotate, realizes the destruction of the thermal boundary layer, improves the heat exchange efficiency and maximizes the recycling of steam, and lays the foundation for the efficient operation of the whole system. On this basis, the stirring wheel is set to three stirring impellers, and the driving guide cylinder, driven shaft, limit plate and tension spring and other structures are used to intelligently adjust the speed and spacing of the stirring impeller according to the change of tail gas temperature. When the tail gas temperature rises, this intelligent adjustment can make the water with significant temperature differences in different regions fully mixed, further break the thermal boundary layer, and improve the heat exchange efficiency. When the tail gas temperature decreases, it can reasonably adjust the operating state, avoid unnecessary energy consumption, ensure the stability and repeatability of the system operation, and further optimize the energy utilization efficiency. At the same time, auxiliary guide plates, limit barrels, sealing plates and other components are set on some stirring impeller blades to form a connected air flow channel, and the auxiliary guide plates form or restore the slope according to the change of the spacing of the stirring impellers. When rotating, it pushes the water away from the cyclone separator body to move closer to the body, thereby enhancing the mixing effect of the water. It cooperates with the previous structure and adjustment mechanism to further break the thermal boundary layer from different angles, thereby comprehensively improving the heat exchange efficiency of the heat exchange system. In summary, the present invention forms an organic whole through the synergistic effect of various structures and functions, and realizes efficient utilization of energy and comprehensive improvement of system performance while effectively treating the exhaust gas from cement production kilns, thus providing strong support for environmental protection and the sustainable development of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the cyclone separator body in a top view of the present invention;

[0029] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0030] Figure 4 It is a structural schematic diagram of the annular guide plate of the present invention;

[0031] Figure 5Schematic diagram of the structure where the three stirring impellers of the present invention are in contact with each other front and back;

[0032] Figure 6 Schematic diagram of the structure where the three stirring impellers of the present invention are separated;

[0033] Figure 7 Schematic diagram of the structure of the driving circular plate and the driving belt of the present invention;

[0034] Figure 8 Schematic diagram of the internal structure of the stirring impeller of the present invention;

[0035] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of part A in;

[0036] Figure 10 Schematic diagram of the cooperation structure of the auxiliary guiding plate, the second slope and the stirring impeller of the present invention.

[0037] In the figure: 1, cyclone separator body; 2, water tank; 3, cooling cylinder; 4, water inlet pipe; 5, air inlet pipe; 6, air outlet pipe; 7, partition plate; 8, fan blade; 9, rotating shaft; 10, driving circular plate; 11, driving belt; 12, stirring impeller; 13, driven shaft; 14, limiting plate; 15, tension spring; 16, limiting cylinder; 17, annular guiding plate; 18, auxiliary guiding plate; 19, driving guiding cylinder; 20, first communication port; 21, second slope; 22, limiting barrel; 23, second communication port; 24, sealing plate. Specific embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1

[0040] During the actual operation process, since the water in the heat conduction tube does not have fluidity and an intermittent water addition method is adopted, there are often vacant sections in the water in the heat conduction tube. According to the basic principle of heat conduction, the vacancy of water will destroy the continuous heat transfer medium, making it impossible for heat to be smoothly transferred from the cyclone separator to the water, thereby significantly reducing the heat exchange effect. In addition, as can be seen from the patent description, the heat conduction tube is spirally arranged downward, with the water inlet end at the top and the gas outlet end at the bottom. When the water in the heat conduction tube is heated and evaporated into gas, the gas will tend to flow along the path with less resistance in the natural state. Since the pressure at the water inlet end is relatively low, most of the steam will enter the second water tank along the path of the heat conduction tube from the water inlet end, and the amount of steam that can enter the second recovery tube from the bottom of the heat conduction tube for power generation is extremely small. According to the theory of energy conversion, the reduction in the amount of steam directly means a reduction in the energy available for power generation, resulting in a significant discount in the energy recovery utilization rate of the device and failing to fully achieve the original intention of its energy-saving design;

[0041] Among them, during the heat exchange process, the formation of the thermal boundary layer is a common and significant phenomenon. From the basic principle of heat transfer, heat exchange is achieved by the temperature difference between the fluid and the solid wall surface to transfer heat. When the fluid flows through the heat exchange pipe, the fluid layer in direct contact with the inner wall of the pipe will be affected by the wall temperature, and its temperature and flow state will change, thus forming a thin layer with a temperature gradient near the inner wall of the pipe, which is the thermal boundary layer.

[0042] The existence of the thermal boundary layer has a great negative impact on the heat exchange efficiency. According to the heat conduction theory, the rate of heat transfer is proportional to the temperature gradient. Inside the thermal boundary layer, due to the relatively slow flow velocity of the fluid, the thermal motion of molecules is restricted, resulting in a reduction in the temperature gradient. This makes it encounter greater resistance during the process of heat transfer from the hot fluid to the cold fluid, equivalent to setting a "barrier" on the heat exchange path, hindering the rapid transfer of heat. Therefore, when the thermal boundary layer exists, the heat exchange efficiency will be greatly reduced, seriously affecting the performance of the heat exchange equipment and the energy utilization efficiency. To solve the above problems, this embodiment is specifically invented.

[0043] Please refer to Figures 1 to 10, the present invention provides a technical solution: a cement production kiln tail gas treatment device, including a cyclone separator body 1 and a water tank 2 arranged on the left side of the cyclone separator body 1. The working principle of the cyclone separator body 1 is the same as that of the cyclone separator in the prior art, that is, the dust-containing gas enters the cylindrical shell of the cyclone separator at a high speed along the tangential direction, rotates in the cylinder, and with the help of the centrifugal force, the dust particles are thrown towards the cylinder wall, separating the dust particles from the gas. The separated dust particles fall along the cylinder wall into the ash hopper for collection, while the purified gas is discharged from the exhaust pipe at the top of the cyclone separator. Therefore, it will not be elaborated in detail. A cooling cylinder 3 is arranged on the outer surface of the cyclone separator body 1, and an annular guide plate 17 is arranged on the inner wall of the cooling cylinder 3. The annular guide plate 17 is sleeved on the outer surface of the cyclone separator body 1, thus forming a spiral downward annular channel on the outer surface of the cyclone separator body 1. A partition plate 7 that can divide it into a cooling channel and a steam channel is arranged in the annular channel. Among them, there is no mutual connection between the cooling channel and the steam channel, and the two operate independently;

[0044] A plurality of stirring wheels that can rotate on the outer peripheral surface of the cyclone separator body 1 are evenly arranged in the cooling channel, and a driving component that can provide power to the stirring wheels is arranged in the steam channel. A plurality of driving belts 11 are evenly fixedly connected to the side of the stirring wheel away from the cyclone separator body 1, and one end of the driving belt 11 away from the cyclone separator body 1 is fixedly connected to a driving circular plate 10. The side of the driving circular plate 10 away from the cyclone separator body 1 is fixedly connected to the driving component. Therefore, when the driving component outputs power to the driving circular plate 10, the driving circular plate 10 will drive the stirring impeller 12 to rotate through the driving belt 11.

[0045] The driving component includes a plurality of rotating shafts 9 that are evenly rotatably connected to the partition plate 7. One end of the rotating shaft 9 extends into the cooling channel and is fixedly connected to the driving circular plate 10, and the other end of the rotating shaft 9 extends into the steam channel and is fixedly connected to a wind blade 8. Therefore, when the wind blade 8 rotates, the driving circular plate 10 can be driven to rotate together through the rotating shaft 9.

[0046] One side of the stirring wheel close to the cyclone separator body 1 is fixedly connected with a limiting cylinder 16 whose one end is rotatably connected to the cyclone separator body 1.

[0047] At the front end of the water tank 2, there is a water inlet pipe 4 connected to the bottom end of the cooling cylinder 3, and the water outlet end of the water inlet pipe 4 is connected to the bottom end of the cooling channel. A water pump for supplying water from the water tank 2 into the cooling channel through the water inlet pipe 4 is arranged in the water tank 2. Therefore, when the water pump works, the water in the water tank 2 can be discharged into the cooling channel through the water inlet pipe 4. And at the top end of the cooling cylinder 3, there is a water outlet pipe connected to the rear end of the water tank 2, and the inlet of the water outlet pipe is connected to the top end of the cooling channel. Therefore, when the water pump works, the water in the cooling channel will return to the water tank 2 from the water outlet pipe, so that the water for cooling can form a complete loop. An air inlet pipe 5 is arranged on the upper surface of the water tank 2. At the same time, a water injection pipe is equipped on the upper surface of the water tank 2, and a liquid level sensor is installed inside the water tank 2. When the liquid level sensor monitors that the water level in the water tank 2 drops to a pre-set height, the liquid level sensor will send a signal to the control box, and then the control box will control the water source to inject water into the water tank 2 through the water injection pipe. And one end of the air inlet pipe 5 far away from the water tank 2 is connected to the top end of the steam channel. At the bottom end of the cooling cylinder 3, there is an air outlet pipe 6, and the inlet of the air outlet pipe 6 is connected to the bottom end of the steam channel. Based on this, the steam flowing into the water tank 2 from the cooling channel will enter the steam channel through the air inlet pipe 5. When the steam flows in the steam channel, it will provide power for the wind blade 8 and push it to rotate. Finally, the steam will be discharged from the air outlet pipe 6 and enter the steam power generation device. It should be noted that the steam power generation device is exactly the same as the device mentioned in the Chinese patent with the application number 202411471405.3, so it will not be elaborated in detail here;

[0048] In industrial production, the improvement of heat exchange efficiency is crucial for the effective utilization of energy and the stable operation of equipment. When the water in the water tank 2 flows into the cooling channel, from the basic principle of heat transfer, heat always transfers from a high-temperature object to a low-temperature object. At this time, the relatively high-temperature cyclone separator body 1 becomes the source of heat, while the low-temperature water acts as the absorber of heat. The water is in full contact with the cyclone separator body 1 and quickly takes away the heat on the surface of the body by means of heat conduction, achieving effective cooling of the cyclone separator body 1.

[0049] During this cooling process, the water absorbs a large amount of heat. When it reaches the boiling point, a phase change will occur, and steam will be generated in the cooling pipeline. The steam contains huge energy. According to the law of conservation of energy, this energy will be further utilized. When the steam enters the steam channel, the kinetic energy generated by its high-speed flow acts on the wind blade 8, just like injecting a powerful driving force into the wind blade 8, prompting the wind blade 8 to rotate rapidly.

[0050] The rotation of the wind blade 8 is transmitted to the driving circular plate 10 through the rotating shaft 9, driving the driving circular plate 10 to rotate synchronously. The driving circular plate 10 is also connected to the stirring impeller 12 through the driving belt 11. Just like a precise transmission system, it accurately transmits the power to the stirring impeller 12, causing the stirring impeller 12 to rotate accordingly.

[0051] When the stirring impeller 12 rotates in the cooling pipeline, it generates a strong disturbance to the water in the pipeline. From the perspective of fluid mechanics, this disturbance will change the flow state of the water, and the originally relatively stable water flow will exhibit turbulence and eddies. The emergence of turbulence and eddies enables each part of the water to be more fully mixed, breaking the originally relatively static state.

[0052] In the heat exchange process, the existence of the thermal boundary layer is a key factor affecting the heat exchange efficiency. The thermal boundary layer refers to a thin layer with a temperature gradient formed between the fluid and the solid wall surface due to the viscosity and heat transfer of the fluid. Within this thin layer, the heat transfer of the fluid mainly relies on heat conduction, and the efficiency of heat conduction is relatively low. When the stirring impeller 12 causes the water to generate turbulence and eddies, these flows can effectively disrupt the stability of the thermal boundary layer. The eddies will roll out the fluid within the thermal boundary layer and mix it with the main body of the water flow, making the thickness of the thermal boundary layer thinner. According to the heat conduction theory, the thinner the thermal boundary layer, the smaller the thermal resistance, and the faster the rate of heat transfer. Therefore, by disrupting the thermal boundary layer, the heat exchange efficiency can be greatly increased, enabling the water to absorb the heat of the cyclone separator body 1 more efficiently and further enhancing the energy utilization efficiency of the entire system.

[0053] In summary, this series of ingenious designs and operation processes, by reasonably utilizing the energy of steam, realizes the cyclic stirring of water, thereby disrupting the thermal boundary layer and significantly improving the heat exchange efficiency, providing a strong guarantee for energy conservation and stable operation of equipment in industrial production.

[0054] At the same time, with the reasonable setting of the water inlet pipe 4, the water outlet pipe, the water tank 2, the water pump, and the cooling channel, a complete loop for the circulating flow of the cooling water can be constructed. Particularly crucial is that the flow direction of the water is consistent with the movement direction of the steam. Based on this co-flow design, the maximum recovery and utilization of steam can be achieved, thereby effectively enhancing the energy utilization efficiency of the entire system.

[0055] Embodiment 2

[0056] In the heat exchange system constructed in the above embodiment, although the thermal boundary layer in the cooling channel is successfully disrupted with the help of specific designs and operating mechanisms, the heat exchange efficiency is improved to a certain extent. According to the heat transfer principle, the thermal boundary layer is one of the main resistances to heat transfer. Disrupting it can make the fluid mix more fully, the temperature gradient more uniform, reduce the thermal resistance, and enable efficient heat transfer.

[0057] However, the temperature of the tail gas entering the cyclone separator is not constant and there are obvious differences. Analyzing from the actual situation of industrial production, the tail gas temperature is comprehensively affected by various factors such as production process fluctuations, changes in equipment operating status, and different raw material characteristics. The instability of the tail gas temperature will bring complex and adverse effects to the heat exchange process. According to the heat exchange principle, the heat exchange rate and effect are closely related to the temperature difference between the hot and cold fluids. When the temperature of the tail gas entering the cyclone separator increases, the heat flux density increases, the amount of heat absorbed by water increases, and the amount of steam generated will also increase accordingly. Excessive steam will form a complex gas-liquid two-phase flow in the cooling channel, interfering with the normal heat exchange process. At the same time, the high-temperature tail gas may also cause too high a heat load in local areas, making it difficult to maintain the destruction effect of the thermal boundary layer evenly. The thermal boundary layer in some areas is still relatively thick, hindering the effective transfer of heat, and thus reducing the overall heat exchange efficiency. To solve the above problems, this embodiment is specifically invented.

[0058] Please refer to Figures 1 to 10 , on the basis of the above embodiment, the technical solution adopted includes that the stirring wheel is composed of three stirring impellers 12, and a driving guide cylinder 19 is arranged between adjacent two stirring impellers 12. One end of the driving guide cylinder 19 close to the cyclone separator body 1 is fixedly connected to one stirring impeller 12, and the other end of the driving guide cylinder 19 is slidably connected to another adjacent stirring impeller 12.

[0059] A driven shaft 13 (on one stirring wheel) is fixedly connected to the stirring impeller 12 farthest from the cyclone separator body 1. One end of the driven shaft 13 close to the cyclone separator body 1 sequentially penetrates through the other two stirring impellers 12 and extends into the cyclone separator body 1. The end of the driven shaft 13 away from the stirring impeller 12 can rotate and slide back and forth in the cyclone separator body 1. There is a gap between the driven shaft 13 and the two stirring impellers 12 close to the cyclone separator body 1. Therefore, when the driving circular plate 10 drives the stirring impeller 12 farthest from the cyclone separator body 1 to rotate through the driving belt 11, the other two stirring impellers 12 are both driven by the driving guide cylinder 19.

[0060] An installation limit groove is provided on the outer peripheral surface of the cyclone separator body 1. One end of the driven shaft 13 away from the stirring impeller 12 is movably connected in the installation limit groove. One end of the driven shaft 13 close to the cyclone separator body 1 is rotatably connected with a limit plate 14, and the limit plate 14 is slidably connected in the installation limit groove. A tension spring 15 with one end arranged in the installation limit groove is fixedly connected to the side of the limit plate 14 away from the driven shaft 13. Therefore, when the driven shaft 13 is in a rotating state, its rotating action will not affect the limit plate 14, and the limit plate 14 can remain relatively stable. However, once the driven shaft 13 slides in the installation limit groove, the driven shaft 13 will drive the associated limit plate 14 to move together.

[0061] During the operation of the entire heat exchange system, when the driving circular plate 10 drives the agitating impeller 12 farthest from the cyclone separator body 1 to rotate with the help of the driving belt 11, based on the principle of synchronization of mechanical transmission, the other two agitating impellers 12 will immediately rotate with the agitating impeller 12, ensuring the continuity and stability of the power transmission within the system.

[0062] From the perspective of thermal principles, when the exhaust gas enters the cyclone separator body 1 and the temperature increases significantly, according to the basic law of heat transfer, the heat will spontaneously transfer from the high-temperature exhaust gas to the water in the low-temperature cooling channel. The temperature difference between the exhaust gas and the water increases, and the heat transfer rate increases significantly, which greatly increases the amount of heat absorbed by the water. According to the phase change principle, after the water absorbs enough heat, the evaporation process intensifies, and the amount of steam generated in the cooling channel increases significantly.

[0063] After the increased steam enters the steam channel, it follows the continuity equation in fluid mechanics. When the cross-sectional area of ​​the steam channel remains unchanged, the increase in steam flow rate will inevitably lead to an increase in its flow rate. High-speed flowing steam has greater kinetic energy. According to the law of conservation of momentum, the steam collides with the fan blade 8 during the flow process and transfers momentum, exerting a force on the fan blade 8, causing the rotation speed of the fan blade 8 to increase. Since the fan blade 8 is connected to the drive circular plate 10 through the rotating shaft 9, the increase in the rotation speed of the fan blade 8 will be directly transmitted to the drive circular plate 10, thereby causing the rotation speed of the drive circular plate 10 to increase accordingly.

[0064] In the heat exchange system, when the driving disc 10 starts to rotate, a plurality of driving belts 11 are evenly distributed around it, and the angles between adjacent driving belts 11 are the same. With this structural setting, the driving disc 10 can transmit power to the stirring impeller 12 with the help of the driving belts 11, thereby driving the stirring impeller 12 to rotate. This process follows the principle of mechanical transmission, that is, the power is transmitted from the driving wheel (driving disc) to the driven wheel (stirring impeller) through the flexible transmission member (driving belt).

[0065] When the driving disc 10 accelerates, the motion state of the driving belt 11 changes significantly. From a mechanical point of view, the stirring impeller 12 is subject to resistance from the surrounding fluid (water in the cooling channel) during rotation. According to Newton's second law, in order to accelerate the rotation of the stirring impeller 12, the driving belt 11 needs to provide a greater driving force. Since the driving belt 11 has a certain elasticity, it will undergo elastic deformation when the driving force increases.

[0066] As the rotational speed of the driving circular plate 10 continuously increases, in order to overcome the resistance on the stirring impeller 12 and accelerate it, the driving belt 11 needs to transmit a greater torque. According to the theory of elastic body torsion in mechanics of materials, when the torque on the elastic body (driving belt) increases, its torsional angle will increase accordingly. Therefore, during the process of the driving circular plate 10 accelerating rotation to drive the stirring impeller 12 to rotate faster, the torsional angle of the driving belt 11 will continuously increase.

[0067] Meanwhile, due to the torsion of the driving belt 11, the internal stress distribution changes, and a component force along the axial direction of the stirring impeller 12 will be generated, that is, an axial tensile force on the stirring impeller 12. According to the principle of force decomposition, when a force acts on an object and its direction forms an angle with a certain direction of the object, this force can be decomposed into two component forces along and perpendicular to this direction. In this case, the force generated by the torsion of the driving belt 11 can be decomposed into a tangential force that makes the stirring impeller 12 rotate and an axial tensile force.

[0068] It is precisely due to the existence of this axial tensile force that under the action of the tensile force, according to Newton's second law, the stirring impeller 12 will generate an acceleration along the direction of the tensile force, thus causing the stirring impeller 12 to move away from the driving belt 11, further changing the position and stirring area of the stirring components in the entire heat exchange system and affecting the heat exchange efficiency.

[0069] At the same time, during the operation of the heat exchange system, the three stirring impellers 12 adjust their working states according to the change of the tail gas temperature, which plays a key role in improving the heat exchange efficiency. When the tail gas temperature is relatively low, the system maintains the basic heat exchange mode, and the stirring impeller 12 rotates at a stable speed in a relatively narrow area. At this time, it mainly stirs the water in a limited range near the periphery of the cyclone separator body 1. This is because the heat transferred by the low-temperature tail gas is limited, and stirring in a small area is sufficient to meet the heat exchange requirements, avoiding unnecessary energy consumption and realizing the rational utilization of energy.

[0070] However, when the tail gas at a higher temperature enters the cyclone separator body 1, the situation changes significantly. A larger temperature difference is formed between the high-temperature tail gas and the water, which promotes more heat to be quickly transferred to the water, resulting in an increase in the water temperature and a substantial increase in the heat exchange demand. At this time, the system shows an intelligent adjustment mechanism, and the stirring impeller 12 can keenly sense the temperature change. As the temperature rises, the rotational speed of the stirring impeller 12 increases, which is based on the linkage relationship between the heat exchange demand and mechanical adjustment. The increase in rotational speed makes the force exerted by the impeller on the water per unit time stronger, thereby driving the water flow speed to increase.

[0071] At the same time, the distance between the impellers gradually increases, effectively widening the stirring area. This change promotes the full mixing of water originally in different areas with significant temperature differences. The water temperature away from the cyclone separator body 1 is lower, and the water close to the body has a higher temperature due to direct contact with the high-temperature body. The widened stirring area allows these two parts of water to blend with each other more frequently. According to the convection heat transfer theory, the full mixing of the fluid can break the thermal boundary layer. The existence of the thermal boundary layer hinders heat transfer, and during the mixing process, the turbulent water flow continuously washes the boundary layer, making its thickness thinner and reducing thermal resistance. At the same time, the degree of fluid turbulence is significantly enhanced, and the path of heat transfer in the water flow is more complex and efficient, so that heat can be transferred more quickly and evenly in the water, thereby greatly improving the heat exchange efficiency of the entire system. This method of intelligently adjusting the speed and stirring area of ​​the stirring impeller 12 according to the exhaust gas temperature not only ensures efficient heat exchange under different working conditions, but also rationally utilizes energy, optimizes the operating performance of the system, and maximizes energy utilization efficiency.

[0072] When the agitating impeller 12, which is farthest from the cyclone separator body 1, moves in a direction away from the cyclone separator body 1, thanks to the ingenious arrangement of the driven shaft 13 and the limit plate 14, the limit plate 14 will exert a force on the tension spring 15, causing it to be gradually stretched. In this process, the tension spring 15 stores elastic potential energy. Once the tension generated by the limit plate 14 disappears, according to Hooke's law, the tension spring 15 will release the tension by virtue of its own stored elastic potential energy, and act in the opposite direction on the agitating impeller 12, causing it to smoothly and accurately return to its original position, thereby ensuring the stability and repeatability of the operation of the entire system.

[0073] Embodiment 3

[0074] In the heat exchange system constructed in the above embodiment, the heat exchange efficiency can indeed be improved to a certain extent by increasing the stirring width of the stirring impeller 12. From the perspective of convective heat transfer theory, increasing the stirring width can allow more regions of the fluid to participate in mixing, destroy the thermal boundary layer, enhance the turbulence of the fluid, promote heat transfer, and thus improve the heat exchange efficiency.

[0075] However, the system still has certain limitations. In the cooling channel, the water far away from the cyclone separator body 1 lacks obvious driving force to move toward the cyclone separator body 1. From the perspective of fluid mechanics, the flow of fluid requires a strong force to change its state of motion. In this system, the stirring of the impeller 12 mainly generates a tangential force, which causes the water to move in a circular motion around the impeller in the horizontal direction, and has limited effect on driving the water away from the cyclone separator body 1 to move axially toward the body.

[0076] Therefore, based on the situation that the water mixing effect in the cooling channel in the above embodiments needs to be strengthened, in order to further improve the heat exchange efficiency, this embodiment is specifically invented.

[0077] Please refer to Figures 1 to 10 , on the basis of the above embodiments, the technical solutions adopted include that auxiliary guiding plates 18 capable of forming slopes are arranged on the blades of the second and third stirring impellers 12 successively away from the cyclone separator body 1, and the blades of each stirring impeller 12 are hollow. A limiting barrel 22 capable of causing the auxiliary guiding plate 18 to deform is arranged inside the blade of each stirring impeller 12, and each limiting barrel 22 corresponds to the position of a driving guiding cylinder 19 adapted thereto one by one. One end of the driving guiding cylinder 19 is slidably connected inside the corresponding limiting barrel 22. Among them, on the first stirring impeller 12 close to the cyclone separator body 1, the position where the fixedly connected driving guiding cylinder 19 is located is different from the position of the driving guiding cylinder 19 fixedly connected to the second stirring impeller 12. Although their positions are different, in the actual operation process, the working principles by which they play roles are the same.

[0078] A second slope 21 is provided at the position on the blade of the stirring impeller 12 covered by the auxiliary guiding plate 18. The material of the auxiliary guiding plate 18 is rubber, so a storage space is formed between the auxiliary guiding plate 18 and the second slope 21, and the storage space is communicated with the limiting barrel 22.

[0079] A second communication port 23 is provided at the bottom end of the limiting barrel 22, and a first communication port 20 is provided on the inner wall of the blade of the stirring impeller 12. Sealing plates 24 are fixedly connected to the circumferential two ends of the outer peripheral surface of the limiting barrel 22 close to the second communication port 23, and the two ends of the two sealing plates 24 away from the limiting barrel 22 are respectively fixedly connected to the inner wall of the blade on the stirring impeller 12;

[0080] Through the arrangement of the sealing plates 24, the second communication port 23 can be connected to the first communication port 20 to form a sealed air channel. From the principle of fluid mechanics, a sealed environment can ensure the stable flow of gas in the channel and avoid unstable pressure changes caused by gas leakage. At this time, the limiting barrel 22, the air channel and the storage space together form a mutually connected air flow channel. This structural design conforms to the principle of communicating vessels. In a connected gas system, the pressures of each part will tend to be balanced, laying a foundation for the subsequent action of the driving guiding cylinder 19 on the air in the air flow channel.

[0081] When the driving guiding cylinder 19 slides inside the limiting barrel 22, it will inevitably affect the air in the air flow channel. In the initial state, the three stirring impellers 12 are in contact with each other, and at this time, the driving guiding cylinder 19 is completely inserted into the limiting barrel 22. According to the principle of gas pressure, the auxiliary guiding plate 18 is in a normal state at this time.

[0082] When the three stirring impellers 12 are separated from each other, the space in the limiting barrel 22 increases accordingly. According to the gas state equation, when the temperature and the amount of gas substance remain unchanged, the volume increases and the pressure decreases. At this time, the pressure in the storage space is relatively large, and air will enter the limiting barrel 22. When the inner side surface of the auxiliary guide plate 18 is attached to the second slope 21, the auxiliary guide plate 18 will form a slope on the stirring impeller 12.

[0083] When the agitating impeller 12 rotates with the auxiliary guide plate 18 forming a slope, according to the vane pump principle in fluid dynamics, the rotating blades (the auxiliary guide plate 18 here is equivalent to the blades) will exert force on the fluid water. Under the action of this slope, the water away from the cyclone separator body 1 will be pushed to move towards the cyclone separator body 1. This directional movement of water can fully mix water in different temperature areas. From the heat exchange principle, it can be seen that the more fully mixed, the easier it is to break the thermal boundary layer, and the more efficient the heat transfer, thereby greatly increasing the mixing effect and heat exchange efficiency of the heat exchange system.

[0084] When the three stirring impellers 12 collide with each other, the driving guide cylinder 19 will squeeze the air in the limiting barrel 22, causing the air to be squeezed back into the storage space. As the air is squeezed in, the auxiliary guide plate 18 will return to its original normal state due to the entry of air.

[0085] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0086] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A cement production kiln tail gas treatment device, comprising a cyclone separator body (1) and a water tank (2) arranged on the left side of the cyclone separator body (1), characterized in that: The outer surface of the cyclone separator body (1) is provided with a cooling cylinder (3), and the inner wall of the cooling cylinder (3) is provided with an annular guide plate (17), and the annular guide plate (17) is sleeved on the outer surface of the cyclone separator body (1), thereby forming an annular channel spiraling downward on the outer surface of the cyclone separator body (1), and a partition plate (7) is provided in the annular channel that can separate the annular channel into a cooling channel and a steam channel; A plurality of stirring wheels capable of rotating on the outer peripheral surface of the cyclone separator body (1) are evenly arranged in the cooling channel, and a driving component capable of providing power to the stirring wheels is arranged in the steam channel, a plurality of driving belts (11) are evenly fixedly connected to the side of the stirring wheel away from the cyclone separator body (1), and a driving circular plate (10) is fixedly connected to one end of the driving belt (11) away from the cyclone separator body (1), and a side of the driving circular plate (10) away from the cyclone separator body (1) is fixedly connected to the driving component.

2. A cement production kiln tail gas treatment device according to claim 1, characterized in that: The driving component comprises a plurality of rotating shafts (9) uniformly rotatably connected to the partition plate (7), one end of the rotating shaft (9) extending into the cooling channel and fixedly connected to the driving circular plate (10), and the other end of the rotating shaft (9) extending into the steam channel and fixedly connected to a fan blade (8).

3. A cement production kiln tail gas treatment device according to claim 2, characterized in that: The stirring wheel is fixedly connected to a side close to the cyclone separator body (1) with one end rotatably connected to an upper limit cylinder (16) of the cyclone separator body (1).

4. A cement production kiln tail gas treatment device according to claim 3, characterized in that: The front end of the water tank (2) is provided with a water inlet pipe (4) connected to the bottom end of the cooling tube (3), and the water outlet end of the water inlet pipe (4) is connected to the bottom end of the cooling channel. The water tank (2) is provided with a water pump for supplying water to the cooling channel through the water inlet pipe (4), and the top end of the cooling tube (3) is provided with a water outlet pipe connected to the rear end of the water tank (2), and the inlet of the water outlet pipe is connected to the top end of the cooling channel. The upper surface of the water tank (2) is provided with an air inlet pipe (5), and the end of the air inlet pipe (5) away from the water tank (2) is connected to the top end of the steam channel. The bottom end of the cooling tube (3) is provided with an air outlet pipe (6), and the inlet of the air outlet pipe (6) is connected to the bottom end of the steam channel.

5. A cement production kiln tail gas treatment device according to claim 4, characterized in that: The stirring wheel is composed of three stirring impellers (12), and a driving guide cylinder (19) is provided between two adjacent stirring impellers (12); one end of the driving guide cylinder (19) close to the cyclone separator body (1) is fixedly connected to one stirring impeller (12), and the other end of the driving guide cylinder (19) is slidably connected to another stirring impeller (12) adjacent thereto.

6. A cement production kiln tail gas treatment device according to claim 5, characterized in that: A driven shaft (13) is fixedly connected to the stirring impeller (12) farthest from the cyclone separator body (1), and the end of the driven shaft (13) close to the cyclone separator body (1) passes through the other two stirring impellers (12) in sequence and extends into the cyclone separator body (1), and the end of the driven shaft (13) far from the stirring impeller (12) is rotatably and slidably arranged in the cyclone separator body (1).

7. A cement production kiln tail gas treatment device according to claim 6, characterized in that: The outer peripheral surface of the cyclone separator body (1) is provided with an installation limit groove, and the end of the driven shaft (13) away from the stirring impeller (12) is movably connected in the installation limit groove, and the end of the driven shaft (13) close to the cyclone separator body (1) is rotatably connected to the limit plate (14), and the limit plate (14) is slidably connected in the installation limit groove, and the side of the limit plate (14) away from the driven shaft (13) is fixedly connected to a tension spring (15) with one end arranged in the installation limit groove.

8. The cement production kiln tail gas treatment device according to claim 7, characterized in that: The blades of the second and third stirring impellers (12) which are successively away from the cyclone separator body (1) are both provided with auxiliary guide plates (18) capable of forming a slope, and the blades on each stirring impeller (12) are hollow, and a limiting barrel (22) capable of causing the auxiliary guide plate (18) to deform is provided inside the blades of each stirring impeller (12), and each limiting barrel (22) corresponds to the position of the driving guide cylinder (19) adapted thereto, and one end of the driving guide cylinder (19) is slidably connected in the corresponding limiting barrel (22).

9. The cement production kiln tail gas treatment device according to claim 8, characterized in that: A second slope (21) is provided at a position on the blade of the stirring impeller (12) covered by the auxiliary guide plate (18), so that a storage space is formed between the auxiliary guide plate (18) and the second slope (21), and the storage space is connected to the limiting barrel (22).

10. The cement production kiln tail gas treatment device according to claim 9, characterized in that: A second communication opening (23) is provided at the bottom end of the limiting barrel (22), a first communication opening (20) is provided on the inner wall of the blade of the stirring impeller (12), and sealing plates (24) are fixedly connected to both ends of the outer circumferential surface of the limiting barrel (22) close to the second communication opening (23), and the ends of the two sealing plates (24) away from the limiting barrel (22) are respectively fixedly connected to the inner wall of the blade on the stirring impeller (12).

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