A flue gas desulfurization tower of an industrial kiln

Abstract

The present application belongs to the field of environmental protection engineering, and particularly relates to a flue gas desulfurization tower of an industrial kiln, which comprises a tower body, an inlet flue port located on the side and a flue outlet located on the top are fixedly arranged on the outer wall of the tower body, a spraying assembly arranged in the tower body and located above the inlet flue port and used for spraying slurry to contact and react with the ascending flue gas, a demisting assembly arranged in the tower body and located above the spraying assembly and used for intercepting liquid droplets entrained in the flue gas after reaction, and a flow uniformizing assembly arranged in the tower body and located between the inlet flue port and the spraying assembly and comprising a tray, a partition plate and at least one triggering mechanism, wherein the tray is fixedly arranged in the tower body, the partition plate is circumferentially arranged on the upper surface of the tray and separates the upper surface of the tray into a mesh hole area in the middle and a liquid storage area at the edge, and the triggering mechanism is in communication with the mesh hole area and the liquid storage area.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering, specifically to a flue gas desulfurization tower for an industrial kiln. Background Technology

[0002] During the high-temperature calcination process in industrial kilns (such as cement kilns, glass kilns, ceramic kilns, and metallurgical roasting furnaces), sulfur in the fuel and volatile sulfides in the raw materials are oxidized into large amounts of sulfur dioxide (SO2), which is emitted with the flue gas. This type of flue gas is typically characterized by large emissions, high temperatures, high dust concentrations, and complex compositions. If discharged directly into the atmosphere without treatment, it will form high concentrations of acid deposition near the ground, damaging surrounding vegetation and soil ecosystems. Therefore, it is essential to install efficient flue gas desulfurization facilities to meet increasingly stringent ultra-low emission environmental protection requirements.

[0003] In the prior art, such as CN105854561B, a device and process for the synergistic treatment of flue gas desulfurization and dust removal are provided. The scheme is to set up a tray perforated plate, a spray absorption layer, a settling and cooling zone and a cyclone high-efficiency demister in the absorption tower from bottom to top. After the flue gas enters, it first passes through the tray perforated plate with baffles and forms a liquid accumulation turbulent layer above the tray with the spray slurry to achieve rectification and uniform distribution and preliminary desulfurization and dust removal. Then, it undergoes deep desulfurization through the spray layer. Subsequently, it is naturally cooled in the settling and cooling zone to enrich and settle fine droplets and dust. Finally, the dust and droplets are captured by the collision of the cyclone demister under the action of centrifugal force, thereby completing the synergistic treatment of desulfurization and dust removal in the same tower.

[0004] The aforementioned existing technology has the following drawbacks: When the system is shut down, the spray slurry supply stops, and the liquid layer above the tray orifice plate will gradually be discharged into the tower bottom through the sieve holes under the action of gravity, causing the liquid holding layer to completely disappear during the shutdown period; when the system is restarted next time, the spray layer must rely on the spray layer to spray the slurry downward again and gradually accumulate the liquid level on the tray until the liquid layer recovers to the designed thickness before it can play the role of forced flow equalization and pre-desulfurization of flue gas again. This process takes a long time and is prone to uneven flue gas flow field and low desulfurization efficiency in the initial stage.

[0005] Therefore, a flue gas desulfurization tower for industrial kilns is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A flue gas desulfurization tower for an industrial kiln, comprising: a tower body, with a flue gas inlet fixedly disposed on the outer wall on the side and a flue gas outlet fixedly disposed on the top; a spray assembly disposed inside the tower body and above the flue gas inlet, for spraying slurry to react with the rising flue gas; a demisting assembly disposed inside the tower body and above the spray assembly, for intercepting liquid droplets entrained in the flue gas after reaction; and a flow equalization assembly disposed inside the tower body and between the flue gas inlet and the spray assembly, comprising a tray, a partition, and at least one triggering mechanism, wherein the tray is fixedly disposed inside the tower body, the partition is disposed circumferentially on the upper surface of the tray and divides the upper surface of the tray into a screen area in the middle and a liquid storage area at the edge, and the triggering mechanism is connected to the screen area and the liquid storage area, for releasing the stored slurry in the liquid storage area to the screen area when the system is started; the triggering mechanism comprises a valve plate and several floats, wherein the valve plate and the partition are slidably disposed through the system, and the several floats are fixedly disposed on the side of the valve plate near the screen area by mounting rods.

[0008] Preferably, the triggering mechanism further includes a surrounding plate, which is fixedly disposed on the side of the partition facing the screen hole area.

[0009] Preferably, the flow equalization assembly further includes an overflow mechanism disposed in the sieve area for controlling the height of the liquid accumulation layer above the tray. The mechanism includes an overflow pipe and a cover, wherein the overflow pipe and the tray are coaxially arranged, and the cover is disposed outside the overflow pipe with a gap between its bottom and the outer wall of the overflow pipe.

[0010] Preferably, the overflow mechanism further includes a baffle, which is fixedly disposed between the overflow pipe and the cover and is configured in a spiral structure.

[0011] Preferably, the flow equalization assembly further includes a flow guide plate and a water stop plate, wherein the flow guide plate is fixedly disposed at the bottom of the tray and located below the liquid storage area, and the water stop plate is fixedly disposed at the bottom of the flow guide plate.

[0012] Preferably, the flow equalization assembly further includes a frame and a drainage channel, wherein the frame is fixedly mounted on the top of the partition, and the drainage channel is opened in the liquid storage area.

[0013] Preferably, the smoke inlet is oriented downwards, and an inclined plate is fixed between the end of the smoke inlet and the inner wall of the tower.

[0014] Preferably, it also includes a waste heat recovery mechanism for recovering the waste heat of high-temperature flue gas and reheating the purified flue gas, including a first water pipe group installed in the flue gas inlet, a second water pipe group installed in the flue gas outlet, and an external water pipe for connecting the first water pipe group and the second water pipe group.

[0015] Preferably, the outer wall of the first water pipe group is provided with several fins to increase the heat exchange surface between the first water pipe group and the flue gas.

[0016] Preferably, the outer surface of the external water pipe is fixed with heat insulation cotton to reduce heat exchange between the internal medium and the outside.

[0017] The advantages of this invention are: 1. The flue gas desulfurization tower for an industrial kiln described in this invention, by setting up baffles, floats, and valve plates, realizes the triggering function of automatically locking water in the liquid storage area when the machine is stopped and automatically replenishing water to the screen hole area by utilizing the liquid level difference between the two areas when the machine is started. This effectively shortens the start-up response time and avoids the problems of flow uniformity failure and desulfurization efficiency reduction caused by insufficient liquid holding layer in the early stage of flue gas start-up.

[0018] 2. The flue gas desulfurization tower for an industrial kiln described in this invention adds a surrounding plate to the side of the partition plate facing the screen hole area, so that the slurry released from the storage area is first injected into the inner side of the surrounding plate to form local water accumulation, and then overflows evenly from the top of the surrounding plate to the entire screen hole area. This effectively prevents the stored water from directly rushing into the screen hole area and then quickly leaking out of the screen holes, ensuring the stability and uniformity of the water replenishment process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the tower structure in this invention; Figure 3 This is a schematic diagram of the structure of the smoke exhaust port in this invention; Figure 4 This is a schematic diagram of the tray structure in this invention; Figure 5 This is a schematic diagram of the overflow pipe in this invention; Figure 6 This is a schematic diagram of the flow guide plate in this invention; Figure 7 This is a schematic diagram of the smoke inlet structure in this invention; Figure 8 This is a schematic diagram of the structure of the fins in this invention.

[0021] In the diagram: 1. Tower body; 12. Smoke inlet; 13. Smoke outlet; 14. Tray; 15. Baffle; 16. Valve plate; 17. Float; 2. Enclosure; 3. Overflow pipe; 32. Cover; 4. Baffle; 5. Guide plate; 52. Water stop plate; 6. Frame; 62. Drainage trough; 7. Inclined plate; 9. Fin; 10. Insulation cotton. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Specific implementation examples are given below.

[0024] Please see Figures 1 to 8 As shown in the embodiment of the present invention, a flue gas desulfurization tower for an industrial kiln includes: a tower body 1, with a flue gas inlet 12 located on the side and a flue gas outlet 13 located at the top fixed on the outer wall; a spray assembly disposed inside the tower body 1 and above the flue gas inlet 12, for spraying slurry to react with the rising flue gas; a demisting assembly disposed inside the tower body 1 and above the spray assembly, for intercepting droplets entrained in the flue gas after reaction; and a flow equalization assembly disposed inside the tower body 1 and between the flue gas inlet 12 and the spray assembly, including a tray 14. The system includes a partition 15 and at least one triggering mechanism. The tray 14 is fixedly installed inside the tower body 1. The partition 15 is circumferentially arranged on the upper surface of the tray 14 and divides the upper surface of the tray 14 into a sieve hole area in the middle and a liquid storage area at the edge. The triggering mechanism is connected to the sieve hole area and the liquid storage area and is used to release the stored slurry in the liquid storage area to the sieve hole area when the system is started. The triggering mechanism includes a valve plate 16 and a plurality of floats 17. The valve plate 16 and the partition 15 are slidably connected through each other. The plurality of floats 17 are fixedly installed on the side of the valve plate 16 near the sieve hole area by mounting rods. During operation, high-temperature flue gas, under the pressure of the fan, sequentially enters the dust collector and induced draft fan from the industrial kiln. After dust removal, the flue gas is discharged through the output end of the induced draft fan to the flue gas inlet 12 and then enters the tower body 1. Subsequently, within the tower body 1, the flue gas sequentially passes through the flow equalization component, the spray component, and the demisting component. The treated flue gas is then discharged to the outside through the exhaust port 13. In this application, the spray component can consist of three sets of staggered spray pipes that can spray circulating slurry (specifically limestone slurry, using a limestone-gypsum wet desulfurization process). This slurry is drawn from the slurry pool at the bottom of the tower body 1 by a circulating pump. The slurry is then fed into the spray pipe assembly and atomized. After being sprayed, the slurry forms a liquid layer of a certain thickness above the tray 14. The flue gas with a turbulent flow field enters the tower body 1 and must pass through the sieve area in the middle of the tray 14 and overcome the resistance of the liquid layer. The liquid layer can force the flue gas to be evenly distributed. The flue gas with a uniform flow field can contact the slurry of the spray assembly and react to desulfurize during its ascent. The desulfurized flue gas can reach the demister assembly. The demister assembly can be a ridge-type demister, which continuously changes the airflow direction through corrugated plates and captures mist droplets in the flue gas by centrifugal force and inertia, thereby achieving gas-liquid separation. The specific structures and basic working principles of the dust collector, induced draft fan, spray assembly, demisting assembly, and tray 14 mentioned above are all mature existing technologies in this field, and therefore will not be described in detail here. This invention uses a triggering mechanism on tray 14. Specifically, before shutdown, the sieve area and liquid storage area above tray 14 are filled with slurry of a certain thickness. The float 17, due to buoyancy, causes the valve plate 16 to rise. At this time, the sieve area and liquid storage area are connected. After shutdown, the slurry in the sieve area can gradually drain under gravity and leak through the sieve holes to the bottom of the tower body 1. During this process, the float 17 can carry the valve plate 16 down along the partition 15 as the liquid level drops. When the slurry thickness in the sieve area drops to a certain value, the bottom of the valve plate 16 can contact and seal with the partition 15. At this time, the sieve area and liquid storage area stop communicating. Then, the slurry in the sieve area continues to drain, while the slurry in the liquid storage area remains unchanged. When restarted, the circulation pump starts, and the spray assembly resumes its operation. When the sprayed slurry is applied, water begins to accumulate in the screen area again, and the liquid level rises from zero. During this process, the liquid level in the storage area also rises, meaning that the liquid level in the storage area is always higher than that in the screen area. When the liquid level in the middle screen area rises to a height sufficient to float the float, the float 17 drives the valve plate 16 to slide upward, and the screen area and the storage area are reconnected. Since the liquid level in the storage area is always higher than that in the screen area, the slurry in the storage area will be replenished to the middle screen area under the action of gravity, so that the liquid level in the screen area can be restored to the normal operating liquid level. This invention divides the upper surface of the tray 14 into a screen area and a storage area by setting a partition 15, and uses the float 17 to drive the valve plate 16 to open and close the connection channel in conjunction with the change of the liquid level in the screen area. This realizes the trigger function of automatically locking water in the storage area when the machine is stopped and automatically replenishing water to the screen area by the liquid level difference between the two areas when the machine is started. This effectively shortens the start-up response time and avoids the problems of flow equalization failure and desulfurization efficiency reduction caused by insufficient liquid holding layer in the early stage of flue gas start-up. In specific implementation, an elastic sealing gasket should be provided at the contact point between the bottom of the valve plate 16 and the partition plate 15 to ensure the sealing when the connection is cut off in the shutdown state, and to prevent the slurry in the storage area from slowly leaking into the screen hole area. The partition plate 15 is provided with a vertical through groove for the valve plate 16 to pass through. The inner wall of the through groove is fitted with a guide sealing sleeve (wear-resistant, low-friction plastic material, such as polytetrafluoroethylene PTFE) and forms a sliding fit with the outer wall of the valve plate 16. The upper and lower ends of the sealing sleeve (i.e., the upper and lower surfaces of the partition plate 15) can be provided with scraping lips facing the valve plate 16. When the valve plate 16 slides, it can scrape off the slurry and solid particles attached to the surface of the valve plate 16, and prevent particles from entering the guide sealing sleeve with the valve plate 16 and causing jamming or wear.

[0025] Please see Figure 4 and Figure 5 As shown, the triggering mechanism also includes a surrounding plate 2, which is fixedly disposed on the side of the partition 15 facing the sieve hole area; When the machine is restarted, the float ball 17, under the buoyancy of the slurry in the screen hole area, drives the valve plate 16 to rise, which will restore the connection between the screen hole area and the storage area. The water in the storage area can flow into the screen hole area. This stored water can first be injected into the enclosure plate 2 and form local water accumulation, and then overflow through the top of the enclosure plate 2 to the entire screen hole area. This allows the liquid level in the screen hole area to quickly return to the normal height, without the stored water leaking directly through the screen holes. By adding the enclosure plate 2 on the side of the partition plate 15 facing the screen hole area, the slurry released from the storage area is first injected into the inner side of the enclosure plate 2 to form local water accumulation, and then overflows evenly through the top of the enclosure plate 2 to the entire screen hole area. This effectively prevents the stored water from rushing directly into the screen hole area and then quickly leaking out of the screen holes, ensuring the stability and uniformity of the water replenishment process.

[0026] Please see Figure 5 and Figure 6 As shown, the flow equalization assembly also includes an overflow mechanism, which is set in the sieve area to control the height of the liquid accumulation layer above the tray 14. It includes an overflow pipe 3 and a cover 32, wherein the overflow pipe 3 and the tray 14 are coaxially arranged, and the cover 32 is set outside the overflow pipe 3 with a gap between its bottom and the outer wall of the overflow pipe 3. During desulfurization, the screen area and the liquid storage area on tray 14 are connected. When the liquid level of the accumulated liquid layer on its surface exceeds the upper end of the overflow pipe 3, the excess slurry can overflow through the overflow pipe 3 to the bottom of the tower body 1. That is, the lower end of the overflow pipe 3 passes through tray 14 and faces the slurry pool at the bottom of the tower body 1 to balance the pressure exerted by the accumulated liquid layer on tray 14. At this time, the overflow pipe 3 is filled with slurry and forms a liquid seal, and the flue gas cannot be reversed from the bottom of the overflow pipe 3. However, when the unit is first started, there is less slurry in the screen area on tray 14, and the thickness of the accumulated liquid layer is relatively small. The overflow pipe 3 may not be fully filled yet. At this time, the inside of the overflow pipe 3 is empty. The flue gas can enter the inside of the overflow pipe 3 through the bottom of the tray 14. The flue gas can reach the gap between the outer wall of the overflow pipe 3 and the inner wall of the cover 32 through the top of the overflow pipe 3. This gap is located in the gas phase space above the liquid surface of the slurry pool and has an inverted U-shaped cross-section. This allows the flue gas to change its flow direction and be discharged downward through the bottom of the cover 32. This allows the downward flowing flue gas to enter the slurry with a lower liquid level, so as to ensure the uniform flow effect of the slurry on these flue gases. In practice, the inner diameter of the overflow pipe 3 should be much larger than the inner diameter of the screen holes in the screen hole area (e.g., the inner diameter of the overflow pipe 3 should be at least 5-10 times the inner diameter of the screen holes, and the specific parameters should be based on actual production) to ensure timely discharge of excess slurry. Also, the top height of the enclosure plate 2 should be lower than the height of the upper end face of the overflow pipe 3 to ensure that it only serves as a temporary water storage structure during the initial startup phase and does not affect the liquid level control during normal operation.

[0027] Please see Figure 5 and Figure 6 As shown, the overflow mechanism also includes a baffle 4, which is fixedly disposed between the overflow pipe 3 and the cover 32 and is configured as a spiral structure. In actual implementation, due to the fluctuation of flue gas load during the production of industrial kilns, when the flue gas volume and pressure are large, the flue gas may backflow into the slurry through the overflow pipe 3, affecting the normal overflow function of the overflow pipe 3. The baffle 4 is continuously arranged in a spatial spiral, which can provide continuous structural resistance to these backflowing flue gas, thereby improving the stability of the liquid seal and overflow in the overflow pipe 3. It should be noted that during normal desulfurization, after the slurry overflows from the upper end face of the overflow pipe 3 into the inner cavity of the overflow pipe 3, it falls directly down the inner wall of the overflow pipe 3 to the slurry pool at the bottom of the tower body 1 under the action of gravity. Due to the principle of communicating vessels, the main channel of the slurry in the entire overflow path is the inner cavity of the overflow pipe 3. That is, the slurry only needs to overcome the frictional resistance along the inner wall of the overflow pipe 3 to be discharged smoothly. There is a liquid level difference between the slurry surface and the discharge port, which drives the slurry to flow continuously downward. That is, the spiral baffle 4 has a very weak resistance to the overflow and discharge of the slurry and will not affect the normal operation of the overflow function.

[0028] Please see Figure 5 and Figure 6 As shown, the flow equalization assembly also includes a flow guide plate 5 and a water stop plate 52, wherein the flow guide plate 5 is fixedly installed at the bottom of the tray 14 and located below the liquid storage area, and the water stop plate 52 is fixedly installed at the bottom of the flow guide plate 5; The guide plate 5 and the water stop plate 52 are located below the liquid storage area. The inner wall of the guide plate 5 is inclined. After the flue gas enters the tower body 1 through the flue gas inlet 12, it can be guided by the inclined surface of the inner wall of the guide plate 5 and directly enter the liquid accumulation layer above through the sieve area, reducing the kinetic energy loss of the flue gas. The sieve area and the overflow pipe 3 will continuously leak slurry. This slurry will drip at the bottom of the tray 14 and on the inclined surface of the guide plate 5. The water stop plate 52 can intercept this dripping slurry to reduce the situation where the dripping slurry flows to the inner wall of the tower body 1 and backflows to the flue gas inlet 12.

[0029] Please see Figure 4 and Figure 5 As shown, the flow equalization assembly also includes a frame 6 and a drain trough 62, wherein the frame 6 is fixedly installed on the top of the partition 15, and the drain trough 62 is opened in the liquid storage area. The top of the frame 6 is symmetrically inclined to prevent the slurry from accumulating at the top of the frame 6. The structure of the frame 6 itself can limit the vertical sliding of the valve plate 16, reducing the possibility of the valve plate 16 sliding off the partition plate 15. The drainage trough 62 is a groove in the liquid storage area and has a branch facing the triggering mechanism. This arrangement allows the slurry in the liquid storage area to be directed to replenish the screen hole area through the branch of the drainage trough 62, thereby shortening the accumulation time of the screen hole area from start-up to normal flow uniformity.

[0030] Please see Figure 7 and Figure 8As shown, the smoke inlet 12 is oriented downwards, and an inclined plate 7 is fixed between the end of the smoke inlet 12 and the inner wall of the tower body 1. The flue gas inlet 12 is oriented at an angle downwards to allow air to enter. This design can further prevent the downward sprayed slurry inside the tower body 1 from flowing back into the flue gas inlet 12. The inclined plate 7 can also reduce the turbulence caused by structural collision when the flue gas enters the tower body 1, thereby reducing the kinetic energy loss of the flue gas. In practice, the horizontal tilt angle of the smoke inlet 12 can be 15-20°.

[0031] Please see Figure 2 , Figure 3 , Figure 7 As shown, it also includes a waste heat recovery mechanism for recovering the waste heat of high-temperature flue gas and reheating the purified flue gas. It includes a first water pipe group installed in the flue gas inlet 12, a second water pipe group installed in the flue gas outlet 13, and an external water pipe for connecting the first water pipe group and the second water pipe group. During desulfurization, the flue gas emitted from industrial kilns is generally at a high temperature. For limestone-gypsum wet desulfurization, the lower the temperature, the more favorable it is for the dissolution and absorption reaction of SO2. Therefore, a first water pipe group is installed at the flue gas inlet 12. The first water pipe group is equipped with a normal temperature or low temperature medium (such as water or heat transfer oil, depending on the flue gas temperature) transported by a transfer pump. This medium can absorb the residual heat contained in the flue gas. The heated medium can be transported to the second water pipe group at the flue gas outlet 13 through an external water pipe, and the desulfurized flue gas at the flue gas outlet 13 is heated to increase the flue gas temperature, which is conducive to the rise and diffusion of the flue gas. In specific implementation, such as Figure 3 and Figure 7 As shown, the first water pipe group and the second water pipe group can be spiral light pipes. The spiral arrangement can extend the contact time between the flue gas and the light pipe.

[0032] Please see Figure 8 As shown, the outer wall of the first water pipe group is provided with several fins 9 to increase the heat exchange surface between the first water pipe group and the flue gas. Because the spiral tube has a small heat exchange area, its heat exchange efficiency is low. Therefore, fins 9 can be installed on the outer wall of the first water tube group. The fins 9 can be H-shaped fins. Compared with the original spiral tube, which requires a large volume, the tube with fins 9 occupies less space. Moreover, the gap between the two fins can prevent the accumulation of a few particulate impurities in the flue gas on the first water tube group. In addition, the second water tube group inside the flue gas outlet 13 is located in the low temperature section, where acid condensation occurs. Therefore, the heat exchange surface material of the second water tube group can be made of 316L stainless steel, which has excellent corrosion resistance to extend its service life.

[0033] Please see Figure 7 and Figure 8As shown, the outer surface of the external water pipe is fixed with heat insulation cotton 10 to reduce the heat exchange between its internal medium and the outside. The insulation cotton 10 can be aluminum silicate fiber cotton or rock wool, covered with aluminum foil or galvanized iron sheet as a waterproof protective layer. The insulation cotton 10 can reduce the thermal conductivity between the external water pipe and the outside world, thereby reducing the heat exchange between the medium and the outside world when the medium flows through the external water pipe and reducing heat loss.

[0034] In summary, the overall workflow of the device in this application is as follows: S1, Shutdown and Water Storage After the system stops, the slurry in the screen hole area is gradually drained through the screen holes under the action of gravity. As the liquid level in the screen hole area drops, the float ball 17 drives the valve plate 16 to slide down along the partition 15. When the liquid level in the screen hole area drops to the set low value, the bottom of the valve plate 16 seals and contacts the partition 15, cutting off the communication channel between the screen hole area and the storage area. The slurry in the storage area is locked in the solid edge area, forming a storage water, which will be used when the system is restarted next time.

[0035] S2, System Startup When the induced draft fan starts, the high-temperature flue gas, after being filtered by dust removal, enters the tower body 1 through the flue gas inlet 12. At the same time, the circulating pump starts, and the spray assembly sprays limestone slurry downwards. Water begins to accumulate again in the sieve area, and the liquid level gradually rises from zero. Due to the buoyancy of the slurry, the float ball 17 drives the valve plate 16 to slide upwards, reopening the connection between the sieve area and the storage area. The liquid level in the storage area is higher than that in the sieve area, and the stored water quickly replenishes the sieve area under the action of gravity pressure difference. After being accumulated by the surrounding plate 2, it overflows evenly to the entire sieve area, so that the liquid level in the sieve area quickly returns to the normal operating height.

[0036] S3, flue gas equalization The turbulent high-temperature flue gas passes through the sieve area in the middle of tray 14 and is forced to overcome the resistance of the liquid layer above the sieve. Under the action of bubble cutting in the liquid holding layer and back pressure feedback of the liquid layer, the flue gas is forced to be evenly distributed throughout the entire cross section of the tower. Subsequently, the flue gas with a uniform flow continues to rise and comes into countercurrent contact with the limestone slurry sprayed by the spraying components. During the process of full mixing of the gas and liquid phases, the absorption and neutralization reaction of SO2 is completed. At the same time, the calcium sulfite generated by the reaction is forced to be oxidized into gypsum by air blown in by the oxidation fan in the slurry pool at the bottom of the tower.

[0037] S4, Liquid Level Control and Demisting Emission During the desulfurization process, when the liquid level of the holding layer above the tray 14 exceeds the height of the upper end face of the overflow pipe 3, the excess slurry overflows through the overflow pipe 3 to the slurry pool at the bottom of the tower body 1, maintaining a constant thickness of the holding layer. When the flue gas load fluctuates, the spiral baffle 4 provides continuous structural resistance to the flue gas that may reverse in the overflow pipe 3, ensuring the stability of the liquid seal. After the reaction is completed, the clean flue gas continues to rise, and after the demister component intercepts the entrained slurry droplets, it is discharged from the tower body through the exhaust port 13.

[0038] S5. Waste heat recovery and flue gas reheating When the high-temperature raw flue gas enters the flue gas inlet 12, the low-temperature medium in the first water pipe group absorbs the waste heat of the flue gas and rises in temperature. The heated medium is then transported through the external water pipe to the second water pipe group in the flue gas outlet 13 to reheat the desulfurized low-temperature clean flue gas, thereby increasing the flue gas temperature to facilitate the rise and diffusion of the flue gas. The insulation cotton 10 on the outer wall of the external water pipe reduces heat loss during the transportation process. The H-shaped fins 9 on the outer wall of the first water pipe group increase the heat exchange area to improve the waste heat recovery efficiency. The second water pipe group is made of 316L stainless steel to resist low-temperature acid corrosion.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A flue gas desulfurization tower for an industrial kiln, characterized in that: include: The tower body (1) has a smoke inlet (12) on the side and a smoke exhaust outlet (13) on the top fixed on the outer wall. The spray assembly is located inside the tower body (1) and above the flue gas inlet (12) for spraying slurry to react with the rising flue gas. The demisting component is installed inside the tower body (1) and above the spraying component, and is used to intercept liquid droplets entrained in the flue gas after the reaction. The flow equalization component is disposed inside the tower body (1) and between the flue gas inlet (12) and the spray component. It includes a tray (14), a baffle (15), and at least one triggering mechanism. The tray (14) is fixedly disposed inside the tower body (1). The baffle (15) is disposed circumferentially on the upper surface of the tray (14) and divides the upper surface of the tray (14) into a sieve area in the middle and a liquid storage area at the edge. The triggering mechanism is connected to the sieve area and the liquid storage area and is used to release the stored slurry in the liquid storage area to the sieve area when the system is started. The triggering mechanism includes a valve plate (16) and several floats (17), wherein the valve plate (16) and the partition plate (15) are slidably connected, and the several floats (17) are fixedly installed on the side of the valve plate (16) near the screen hole area by means of a mounting rod.

2. The flue gas desulfurization tower for an industrial kiln according to claim 1, characterized in that: The triggering mechanism also includes a surrounding plate (2), which is fixedly disposed on the side of the partition (15) facing the sieve hole area.

3. The flue gas desulfurization tower for an industrial kiln according to claim 1, characterized in that: The flow equalization assembly also includes an overflow mechanism, which is set in the sieve area to control the height of the liquid layer above the tray (14). It includes an overflow pipe (3) and a cover (32), wherein the overflow pipe (3) and the tray (14) are coaxially arranged, and the cover (32) is set outside the overflow pipe (3) with a gap between its bottom and the outer wall of the overflow pipe (3).

4. The flue gas desulfurization tower for an industrial kiln according to claim 3, characterized in that: The overflow mechanism also includes a baffle (4), which is fixedly disposed between the overflow pipe (3) and the cover (32) and is configured as a spiral structure.

5. The flue gas desulfurization tower for an industrial kiln according to claim 1, characterized in that: The flow equalization assembly also includes a flow guide plate (5) and a water stop plate (52), wherein the flow guide plate (5) is fixedly installed at the bottom of the tray (14) and located below the liquid storage area, and the water stop plate (52) is fixedly installed at the bottom of the flow guide plate (5).

6. The flue gas desulfurization tower for an industrial kiln according to claim 5, characterized in that: The flow equalization assembly also includes a frame (6) and a drain (62), wherein the frame (6) is fixedly installed on the top of the partition (15) and the drain (62) is opened in the liquid storage area.

7. The flue gas desulfurization tower for an industrial kiln according to claim 1, characterized in that: The smoke inlet (12) is oriented downwards, and an inclined plate (7) is fixed between the end of the smoke inlet (12) and the inner wall of the tower body (1).

8. The flue gas desulfurization tower for an industrial kiln according to claim 1, characterized in that: It also includes a waste heat recovery mechanism for recovering the waste heat of high-temperature flue gas and reheating the purified flue gas, including a first water pipe group set in the flue gas inlet (12), a second water pipe group set in the flue gas outlet (13), and an external water pipe for connecting the first water pipe group and the second water pipe group.

9. The flue gas desulfurization tower for an industrial kiln according to claim 8, characterized in that: The outer wall of the first water pipe group is provided with several fins (9) to increase the heat exchange surface between the first water pipe group and the flue gas.

10. A flue gas desulfurization tower for an industrial kiln according to claim 8, characterized in that: The outer surface of the external water pipe is fixed with heat insulation cotton (10) to reduce the heat exchange between its internal medium and the outside.

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