Flue gas desulfurization device

Abstract

The invention relates to a flue gas desulfurization device. The crushing and grinding module comprises a crushing and grinding tower, a feeding tower and a hot blast stove. At least two stages of crushing and grinding mechanisms are arranged in the crushing and grinding tower from top to bottom, the grinding particle sizes of the crushing and grinding mechanisms decrease progressively, the screening particle sizes of the vibrating screens decrease progressively correspondingly, the vibrating screens are obliquely arranged, and the lower ends of the vibrating screens form a discharging end; and the air outlet of the hot-blast stove blows high-temperature airflow upwards from the bottom of the feeding tower so as to heat unqualified materials in the conveying process, so that the limestone is embrittled to improve the grinding efficiency and the self activity, and the reaction activity of the limestone is integrally improved.

Description

Technical Field

[0001] The invention relates to a flue gas desulfurization device. Background Art

[0002] Wet flue gas desulfurization equipment utilizes the limestone-gypsum process. This involves preparing a limestone slurry that contacts the flue gas, absorbing SO₂ and producing calcium sulfite, which then oxidizes to form gypsum. This system primarily includes a slurry preparation system for limestone crushing, grinding, and slurry preparation; an absorption tower that sprays the limestone slurry onto the flue gas to initiate the core reaction; an oxidation blower that injects air into the tower to oxidize the calcium sulfite into calcium sulfate; and a gypsum dehydration system.

[0003] The problem of insufficient limestone activity exists in wet flue gas desulfurization equipment during use. On the one hand, the particle size of the limestone powder prepared by its crushing and grinding mechanism leads to a slow dissolution rate of the limestone powder, causing the pH value of the slurry to drop too quickly, which easily causes the limestone shielding effect, reduces the desulfurization efficiency, and deteriorates the quality of gypsum. On the other hand, it is because the limestone powder itself has low activity. Summary of the Invention

[0004] The object of the present invention is to provide a flue gas desulfurization device to solve the technical problem of insufficient limestone activity in the wet desulfurization device in the prior art.

[0005] The technical solution of the present invention is as follows: A flue gas desulfurization device includes a slurry preparation system, the slurry preparation system includes a limestone crushing and grinding module and a limestone powder slurrying module, and the limestone crushing and grinding module includes: A grinding tower comprises a first tower body and at least two stages of grinding mechanisms arranged in the first tower body from top to bottom, wherein the particle size of the output material of each stage of the grinding mechanism decreases from top to bottom, the grinding mechanism comprises a grinding roller and a vibrating screen, and the screening particle size of the vibrating screen of each stage of the grinding mechanism decreases from top to bottom, the vibrating screen is located below the grinding roller and is arranged obliquely, and the lower end of the vibrating screen is the discharge end for screened unqualified materials, and the first tower body is provided with a feed port and a discharge port for unqualified materials corresponding to each stage of the grinding mechanism, and the discharge port is arranged corresponding to the discharge port; A feeding tower comprises a second tower body and a bucket elevator vertically arranged in the second tower body, the bucket elevator comprises a traction chain and a plurality of hoppers spaced apart on the traction chain, the traction chain runs a set distance at a time in a step-by-step manner, and the hoppers respectively have at least two feeding stations and two discharging stations during operation, the feeding stations respectively corresponding to the discharging ports of the various levels of crushing and grinding mechanisms, and the discharging stations respectively corresponding to the feeding ports of the various levels of crushing and grinding mechanisms, and the front side panel of the hopper is a flap, which opens when the hopper is in the discharging station to allow the material in the hopper to flow to the feeding port; The hot air furnace comprises an air supply pipe, the outlet of which extends to the bottom of the second tower body and is located below the hopper of the bucket elevator on the side close to the crushing and grinding tower, so as to heat the material from bottom to top.

[0006] Based on the above solution, a further improvement is made as follows: the lower edge of the flap is hinged to the hopper body, and a torsion spring is installed between the flap and the hopper body. The torsion spring provides an elastic force to flip the flap upward. This allows the flap to be easily and automatically reset without the need for a complex power source on the hopper, resulting in a simple and practical structure.

[0007] Based on the above solution, a further improvement is provided as follows: a fixed rod is provided on the inner wall of the second tower body above the feed inlet, with the front end of the fixed rod extending in the direction of the drag chain. As the hopper moves upward, the fixed rod blocks the flap and causes it to flip downward. The fixed rod is provided to cooperate with the flap equipped with a torsion spring. Through relative movement between the two, the fixed rod presses the flap downward, causing it to automatically open when it reaches the feed inlet, thereby automatically unloading the hopper.

[0008] Based on the above solution, a further improvement is provided as follows: an inclined guide plate is installed through the feed port. The left half of the guide plate is located within the second tower body, and the right half is located within the first tower body. The left half of the guide plate extends toward the traction chain to receive material flowing down from the flap, while the right half of the guide plate extends above the extrusion working area of the corresponding crushing and grinding rollers. The installation of the guide plate not only achieves perfect docking with the discharge hopper, but also guides material above the extrusion working area of the crushing and grinding rollers, realizing a closed loop of material circulation, extrusion, and grinding.

[0009] Based on the above solution, a further improvement is provided as follows: the upper end of the left half of the guide plate is connected to an elastic avoidance plate extending toward the bottom of the hopper's flap. By providing the elastic avoidance plate, as the hopper passes by, the elastic deformation of the elastic avoidance plate causes the hopper to move along the elastic avoidance plate to the top of the elastic avoidance plate. Subsequently, the elastic return of the elastic avoidance plate allows the elastic avoidance plate to function as a part of the guide plate and be received under the flap, ensuring that all material falls onto the guide plate. This prevents the hopper from interfering with the guide plate during upward movement, preventing it from becoming immobile or damaging the guide plate. Furthermore, the guide plate can receive material from under the flap, preventing it from spilling.

[0010] Based on the above solution, a further improvement is made as follows: the feed port and the discharge port are provided with opening and closing doors, which are driven by an electrically controlled drive mechanism. When the hopper moves to the corresponding feed port and discharge port, the opening and closing doors are opened, and when the hopper leaves the corresponding feed port and discharge port, the opening and closing doors are closed. By providing the opening and closing doors, it is possible to close them promptly after the feeding and discharging of materials are completed. On the one hand, this can prevent the material from spilling out of the discharge port and causing the material to accumulate in the second tower barrel. On the other hand, it can minimize the high-temperature airflow from directly entering the first tower barrel, thereby facilitating the high-temperature airflow to concentrate on heating the unqualified materials in the hopper, making these unqualified materials brittle and improving the subsequent grinding efficiency.

[0011] Based on the above solution, a further improvement is made as follows: a turbine buffer nozzle is provided at the outlet of the air supply pipe. The provision of the turbine buffer nozzle can slow down the flow rate of the high-temperature airflow, avoid lifting the smaller-sized materials in the hopper, and make the high-temperature airflow more evenly distributed.

[0012] Based on the above solution, a further improvement is made as follows: perforations are provided on adjacent partitions at the bottom of the first and second tower barrels, penetrating the first and second tower barrels. Elastic diaphragms are provided at the perforations, and the elastic diaphragms have slits that open when a set pressure is reached to prevent excessive pressure in the second tower barrel. The structure of providing perforations and elastic diaphragms at the bottom is primarily to provide safety protection for the second tower barrel, ensuring that the pressure of the high-temperature airflow within the second tower barrel is not too high. When the pressure within the second tower barrel is too high, the slits of the closed elastic diaphragm will open, thereby releasing a portion of the high-temperature airflow into the first tower barrel. This design not only meets the pressure relief requirements of the second tower barrel, but also effectively utilizes this portion of the released high-temperature airflow, as it can heat the crushed and ground materials after entering the first tower barrel, increasing their activity.

[0013] On the basis of the above scheme, further improvements are made as follows: the vibrating screen includes a screen, an elastic support seat and an exciter, and the angle between the screen and the horizontal plane is 5-15°.

[0014] Based on the above solution, a further improvement is made as follows: the front end of the fixing rod has an elastic metal section, and the front end of the elastic metal section is equipped with a steel ball for rolling. This design prevents the fixing rod and the flap from getting stuck, and the steel ball creates rolling friction between them, further preventing sticking or jamming.

[0015] Beneficial effects of the present invention: When the flue gas desulfurization device of the present invention is in use, after the limestone is put into the top of the first tower, it is first coarsely crushed by the first-stage crushing and grinding mechanism, and the coarsely crushed material falls on the first-stage vibrating screen. Under the vibration of the vibrating screen, the material that meets the screening particle size of the first-stage vibrating screen continues to fall onto the second-stage crushing and grinding mechanism, and the material that does not meet the screening particle size of the first-stage vibrating screen gradually moves from high to low due to the inclined setting of the vibrating screen and the vibration of the vibrating screen, and finally discharges from the discharge end at the bottom of the vibrating screen. At this time, the corresponding first-stage discharge port is opened, and the material flows into the second tower through the discharge port. At the same time, it runs in a step-by-step manner The corresponding hopper of the bucket elevator moves to the corresponding discharge port, and the material flowing out of the discharge port enters the hopper. Then the bucket elevator continues to run, the hopper filled with material moves up, and the corresponding discharge port is closed. When the hopper carrying the material moves to the corresponding feed port of the first-stage crushing and grinding mechanism, the flap-opening mechanism flips the flap of the hopper downward, so that the material in the hopper flows along the inner surface of the flap to the feed port, and then falls into the upper part of the first-stage crushing and grinding roller, thereby realizing the second extrusion and grinding of this part of unqualified material. Subsequently, the unqualified products after screening of this part of material are extruded and ground for the third time until all are qualified; similarly, the crushing and grinding mechanisms of other levels also The above working principle and working cycle continue until the crushed materials meet the standards; at the same time, the high-temperature gas blown by the hot blast furnace flows upward from the bottom of the second tower, heating the unqualified materials flowing out of the discharge ports of each level of crushing and grinding mechanism from bottom to top. Since the heated limestone becomes looser and more fragile, it is easier to be crushed and refined during the grinding process, thereby improving the grinding efficiency. At the same time, the high-temperature gas will also stimulate the activity of the limestone material itself, thereby improving the efficiency of the subsequent pulping and dissolution, and improving the activity of the limestone in the subsequent chemical reaction process. More importantly, since the temperature of the high-temperature gas is the lowest when it just enters the second tower, The higher the temperature, the sooner the material produced by the crushing and grinding mechanism is closer to the bottom will be pulped and participate in the chemical reaction. The high-temperature gas can achieve the above requirements by adopting a bottom-up air intake method, so that the temperature of the limestone powder material at the lower level is higher, thereby improving the activity of the limestone powder itself. In other words, the scheme of the present application can achieve a higher heating temperature for the limestone material closer to the lower level, so that the limestone material has higher activity in the subsequent pulping and chemical reaction process, and the limestone materials at each level can accelerate embrittlement and improve the grinding efficiency after being heated to different degrees. The special structure of the multi-stage crushing and grinding mechanism of the present application can further improve the limestone grinding efficiency. It can be seen that the limestone crushing and grinding module of the slurry preparation system of the flue gas desulfurization device of the present application has the advantages of high crushing and grinding efficiency, high finished product rate of limestone powder after grinding, high dissolution efficiency of the ground finished product in the subsequent pulping process, and significantly improved activity of the limestone powder itself, which significantly improves the overall activity of the limestone, thereby improving the desulfurization efficiency and ensuring the quality of gypsum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the internal structure of a limestone crushing and grinding module in an embodiment of a flue gas desulfurization device of the present invention; Figure 2 for Figure 1 A partial enlarged view of point A in the middle; Figure 3 for Figure 1 A partial enlarged view of point B in the middle; Figure 4 is the front view of the elastic diaphragm; In the figure: 1-crushing tower, 11-first tower body, 111-limestone inlet, 112-limestone powder outlet, 113-feeding port, 114-discharging port, 115-guide plate, 1151-left half, 1152-right half, 1153-elastic avoidance plate, 116-opening and closing door, 117-electrically controlled drive mechanism, 118-discharging inclined plate, 12-first stage crushing and grinding mechanism, 121-crushing and grinding rollers, 122-vibrating screen, 1221-screen, 1222-discharging end, 1223-elastic support seat, 1224-exciter , 13-second-stage crushing and grinding mechanism, 14-conveyor plate, 2-feeding tower, 21-second tower cylinder, 211-fixed rod, 212-discharge tray, 213-bulk material outlet, 214-perforation, 22-bucket elevator, 221-traction chain, 222-hopper, 2221-hopper body, 2222-flip, 2223-articulated shaft and torsion spring, 223-drive roller, 23-elastic diaphragm, 231-slit, 232-mounting hole, 24-fixing bolt, 3-hot air furnace, 31-air supply pipe, 32-turbine buffer nozzle. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0019] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0020] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0021] An embodiment of a flue gas desulfurization device of the present invention: Figure 1-4 As shown in the figure, it is a schematic diagram of the internal structure of the limestone crushing and grinding module in the slurry preparation system of the flue gas desulfurization device.

[0022] The limestone crushing and grinding module mainly includes a crushing and grinding tower 1, a feeding tower 2 and a hot air furnace 3. The specific structure is as follows: The crushing and grinding tower 1 comprises a first tower body 11 and at least two stages of crushing and grinding mechanisms disposed within the first tower body 11 from top to bottom. The first tower body 11 is generally rectangular in shape, with a height greater than its length, and is made of a high-temperature resistant metal such as stainless steel. A limestone inlet 111 is provided in the center of its top for inputting limestone raw material, and a limestone powder outlet 112 is provided on one side of its bottom. Discharge ramps 118 are provided to drain the material. This embodiment illustrates a two-stage crushing and grinding mechanism. In other embodiments, three or more stages may be provided, depending on crushing accuracy and grinding efficiency. The particle size of the output material decreases from top to bottom. The crushing and grinding mechanism includes a pair of crushing rollers 121 and a vibrating screen 122. The pair of crushing rollers 121 are symmetrically arranged crushing and grinding mechanisms. The relative rotation of the rollers is driven by a reduction motor to crush the material in the contact gap between them. The outer circumference of the rollers may be provided with crushing protrusions or teeth, etc. The screening particle size of the vibrating screen 122 decreases from top to bottom. Symmetrically arranged manifolds 14 are provided between the various levels of crushing and grinding mechanisms. The manifolds 14 and the inner wall of the first tower body 11 form a structure with a narrow top and a narrow bottom. This allows the material sieved from the vibrating screen 122 of the previous level to enter from the upper end of the structure surrounded by the manifolds 14 and converge and then flow to the central working area of the crushing and grinding rollers 121 of the next level, ensuring that all the material can be squeezed by the crushing and grinding rollers 121. The vibrating screen 122 is located below the crushing and grinding rollers 121 and is arranged at an angle. The lower end of the vibrating screen 122 is the discharge end 1222 for the screened unqualified material. The first tower body 11 is provided with a feed port 113 and a discharge port 114 for unqualified material corresponding to each level of crushing and grinding mechanisms, and the discharge end 1222 is arranged corresponding to the discharge port 114. Among them, a discharge tray 212 extending obliquely downward is provided on the side of the discharge port 114 corresponding to the discharge end 1222 close to the second tower body. The discharge tray 212 is a U-shaped structure, and it extends toward the side of the hopper 222 to the upper end close to the hopper 222, and the discharge tray 212 will not contact the hopper 222 to avoid interference between the two. When the material in the discharge tray flows downward, it can smoothly flow into the hopper 222 at its lower left by relying on inertia.

[0023] The feed port 113 and the discharge port 114 are provided with an opening and closing door 116, which is driven by an electric control drive mechanism 117. When the hopper 222 moves to the corresponding feed port 113 and the discharge port 114, the opening and closing door 116 opens, and when the hopper 222 leaves the corresponding feed port 113 and the discharge port 114, the opening and closing door 116 closes. The electric control drive mechanism in this embodiment is an electric push rod, which can also be replaced by an electromagnetic valve mechanism, but no matter which one, a resistant structural design is required. By setting the opening and closing door 116, it can be closed in time after the feeding and discharging are completed. On the one hand, it can avoid the material from spilling out from the discharge port 114, thereby causing the material to accumulate in the second tower barrel 21. On the other hand, it can minimize the high-temperature airflow from directly entering the first tower barrel 11, thereby facilitating the high-temperature airflow to concentrate on heating the unqualified materials in the hopper 222, making these unqualified materials brittle and improving the subsequent grinding efficiency. The vibrating screen 122 includes a screen 1221, an elastic support seat 1223 and a vibrator 1224. The angle between the screen 1221 and the horizontal plane is 5-15 degrees.

[0024] The feeding tower 2 includes a second tower body 21 and a bucket elevator 22 vertically arranged in the second tower body 21. The bucket elevator 22 includes a traction chain 221 and a plurality of hoppers 222 spaced apart on the traction chain 221. The traction chain 221 runs a set distance at a time in a step-by-step manner. For example, the distance of each run is equal to the distance between the discharge port 114 and the feed port 113 of the same level of crushing and grinding mechanism. The hopper 222 has at least two feed stations and two discharge stations during operation. The feed stations correspond to the discharge ports 114 of the crushing and grinding mechanisms at each level, and the discharge stations correspond to the feed ports 113 of the crushing and grinding mechanisms at each level. The front side panel of the hopper 222 is a flap 2222. When the hopper 222 is in the discharge position, the flap 2222 is opened to allow the material in the hopper 222 to flow to the feed port 113. The lower edge of the flap 2222 is hinged to the main body of the hopper 222. A torsion spring is provided between the flap 2222 and the main body of the hopper 222, providing an elastic force to tilt the flap 2222 upward. This allows the flap 2222 of the hopper 222 to automatically reset without requiring a complex power source, resulting in a simple and practical structure. A fixed rod 211 is provided on the inner wall of the second tower body 21 above the feed inlet 113. The front end of the fixed rod 211 extends toward the traction chain 221. As the hopper 222 moves upward, its flap 2222 is stopped by the fixed rod 211 and tilted downward. By providing the fixed rod 211 to cooperate with the flap 2222 with the torsion spring, the relative movement of the two causes the fixed rod 211 to press the flap 2222 downward, causing the flap 2222 to automatically open when it reaches the feed inlet 113, thereby automatically unloading the material. The front end of the fixing rod 211 has an elastic metal section, and the front end of the elastic metal section is provided with a steel ball rolling on it. Such a design avoids the situation that the fixing rod 211 and the flap 2222 become stuck, and the arrangement of the steel balls causes rolling friction between them, further preventing them from getting stuck or stagnating.

[0025] An inclined guide plate 115 extends through the feed inlet 113. The left half 1151 of the guide plate 115 is located within the second tower body 21, while the right half 1152 is located within the first tower body 11. The left half 1151 of the guide plate 115 extends toward the traction chain 221 to receive material flowing down from the flap 2222. The right half 1152 of the guide plate 115 extends above the extrusion working area of the corresponding grinding roller 121. The configuration of the guide plate 115 not only ensures perfect docking with the discharge hopper 222, but also directs material above the extrusion working area of the grinding roller 121, achieving a closed loop of material circulation, extrusion, and grinding. The upper end of the left half 1151 of the guide plate 115 is connected to an elastic avoidance plate 1153 that extends below the flap 2222 of the hopper 222. By setting the elastic avoidance plate 1153, when the hopper 222 passes by, due to the elastic deformation of the elastic avoidance plate 1153, the hopper 222 moves to the top of the elastic avoidance plate 1153 in contact with the elastic avoidance plate 1153, and then due to the elastic reset of the elastic avoidance plate 1153, the elastic avoidance plate 1153 can be supported under the flap 2222 as part of the guide plate 115, ensuring that all materials fall onto the guide plate 115. On the one hand, the hopper 222 will not be unable to move or damage the guide plate 115 due to interference when moving upward, and on the other hand, the guide plate 115 can be supported under the flap 2222 to prevent the material from spilling.

[0026] The hot air furnace 3 includes a combustion furnace, a blower, and an air supply pipe 31. The outlet of the air supply pipe 31 extends to the bottom of the second tower body 21 and is located below the hopper 222 on the side of the bucket elevator 22 near the crushing and grinding tower 1, heating the material from bottom to top. A turbine buffer nozzle 32 is installed at the outlet of the air supply pipe 31. The turbine buffer nozzle 32 slows the flow rate of the high-temperature airflow, preventing the lifting of smaller particles in the hopper 222, while also ensuring a more even distribution of the high-temperature airflow.

[0027] A through-hole 214 is provided on adjacent partitions at the bottom of the first and second tower barrels 21, penetrating the first and second tower barrels 21. An elastic diaphragm 23 is provided at the through-hole 214. The elastic diaphragm 23 has a slit 231 that opens when a set pressure is reached to prevent excessive pressure in the second tower barrel 21. The structure of providing the through-hole 214 and the elastic diaphragm 23 at the bottom is primarily for safety protection of the second tower barrel 21, so that the pressure of the high-temperature airflow in the second tower barrel 21 will not be too high. When the pressure in the second tower barrel 21 is too high, the slit 231 of the elastic diaphragm 23, which is in a closed state, will open, thereby releasing a portion of the high-temperature airflow into the first tower barrel 11. This design not only meets the pressure relief requirement of the second tower barrel 21, but also effectively utilizes this portion of the released high-temperature airflow, because after entering the first tower barrel 11, this portion of the high-temperature airflow can heat the crushed and ground materials, thereby increasing their activity.

[0028] A funnel structure is provided at the bottom of the second tower body, and a bulk material outlet 213 is provided at the bottom of the funnel structure to collect a small amount of bulk material scattered at the bottom of the second tower body. By providing a valve at the bulk material outlet 213, the bulk material can be cleaned regularly.

[0029] The through hole 214 is set as a circular hole with threaded holes evenly distributed around the circular hole. The elastic diaphragm 23 is fixed relative to the through hole 214 by passing a bolt through the mounting hole 232 of the elastic diaphragm 23. When the air pressure in the second tower barrel is relatively low, the slit 231 will not open. When the air pressure is relatively high, the air pressure will force the slit 231 to open, thereby discharging excess high-temperature gas into the first tower barrel, thereby achieving safety protection for the second tower barrel, and the discharged high-temperature gas can be used to heat the material in the first tower barrel.

[0030] When the flue gas desulfurization device of the present invention is in use, after limestone is put into the top of the first tower, it is first coarsely crushed by the first-stage crushing and grinding mechanism 12, and the coarsely crushed material falls on the first-stage vibrating screen 122. Under the vibration of the vibrating screen 122, the material that meets the screening particle size of the first-stage vibrating screen 122 continues to fall onto the second-stage crushing and grinding mechanism 13, and the material that does not meet the screening particle size of the first-stage vibrating screen 122 gradually moves from high to low due to the inclined setting of the vibrating screen 122 and the vibration of the vibrating screen 122, and finally discharges from the discharge end 1222 at the bottom of the vibrating screen 122. At this time, the corresponding first-stage discharge port 114 is opened, and the material flows into the second tower through the discharge port 114. At the same time, the material is discharged in steps of The corresponding hopper 222 of the bucket elevator 22 running in the forward mode moves to the corresponding discharge port 114, and the material flowing out of the discharge port 114 enters the hopper 222, and then the bucket elevator 22 continues to run, the hopper 222 filled with material moves up, and the corresponding discharge port 114 is closed. When the hopper 222 carrying the material advances to the corresponding feed port 113 of the first-stage crushing and grinding mechanism 12, the mechanism of opening the flap 2222 flips the flap 2222 of the hopper 222 downward, so that the material in the hopper 222 flows along the inner surface of the flap 2222 to the feed port 113, and then falls into the upper part of the first-stage crushing and grinding roller 121, thereby realizing the second extrusion and grinding of this part of unqualified material. The unqualified products after screening are extruded and ground for the third time until all of them are qualified; similarly, the other levels of crushing and grinding mechanisms also follow the above working principles and working cycles until the crushed materials meet the standards; at the same time, the high-temperature gas blown by the hot blast furnace 3 flows upward from the bottom of the second tower, and heats the unqualified materials flowing out of the discharge ports 114 of the crushing and grinding mechanisms at each level from bottom to top. Since the heated limestone becomes looser and more fragile, it is easier to be crushed and refined during the grinding process, thereby improving the grinding efficiency. At the same time, the high-temperature gas will also stimulate the activity of the limestone material itself, thereby improving the efficiency of the subsequent pulping and dissolution, and improving the activity of the limestone in the subsequent chemical reaction process; more importantly The point is that since the temperature of the high-temperature gas is the highest when it just enters the second tower, and the material produced by the crushing and grinding mechanism closer to the bottom will be pulped and participate in chemical reactions earlier, the high-temperature gas can be introduced from bottom to top to achieve the above requirements, so that the temperature of the limestone powder material at the lower level is higher, thereby increasing the activity of the limestone powder itself. In other words, the scheme of the present application can achieve higher heating temperatures for the limestone material closer to the lower level, so that the limestone material has higher activity in the subsequent pulping and chemical reaction process, and the limestone materials at each level can be accelerated to embrittle after being heated to different degrees to improve the grinding efficiency. Combined with the special structure of the multi-stage crushing and grinding mechanism of the present application, the limestone grinding efficiency is further improved.It can be seen that the limestone crushing and grinding module of the slurry preparation system of the flue gas desulfurization device of the present application has the advantages of high crushing and grinding efficiency, high yield rate of limestone powder after grinding, high dissolution efficiency of the ground finished product in the subsequent slurrying process, and significantly improved activity of the limestone powder itself, which significantly improves the overall activity of the limestone, thereby improving the desulfurization efficiency and ensuring the quality of gypsum.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A flue gas desulfurization device, comprising a slurry preparation system, the slurry preparation system comprising a limestone crushing and grinding module and a limestone powder slurrying module, characterized in that: Limestone crushing and grinding module includes: A grinding tower comprises a first tower body and at least two stages of grinding mechanisms arranged in the first tower body from top to bottom, wherein the particle size of the output material of each stage of the grinding mechanism decreases from top to bottom, the grinding mechanism comprises a grinding roller and a vibrating screen, and the screening particle size of the vibrating screen of each stage of the grinding mechanism decreases from top to bottom, the vibrating screen is located below the grinding roller and is arranged obliquely, and the lower end of the vibrating screen is the discharge end for screened unqualified materials, and the first tower body is provided with a feed port and a discharge port for unqualified materials corresponding to each stage of the grinding mechanism, and the discharge port is arranged corresponding to the discharge port; A feeding tower comprises a second tower body and a bucket elevator vertically arranged in the second tower body, the bucket elevator comprises a traction chain and a plurality of hoppers spaced apart on the traction chain, the traction chain runs a set distance at a time in a step-by-step manner, and the hoppers respectively have at least two feeding stations and two discharging stations during operation, the feeding stations respectively corresponding to the discharging ports of the various levels of crushing and grinding mechanisms, and the discharging stations respectively corresponding to the feeding ports of the various levels of crushing and grinding mechanisms, and the front side panel of the hopper is a flap, which opens when the hopper is in the discharging station to allow the material in the hopper to flow to the feeding port; The hot air furnace comprises an air supply pipe, the outlet of which extends to the bottom of the second tower body and is located below the hopper of the bucket elevator on the side close to the crushing and grinding tower, so as to heat the material from bottom to top.

2. A flue gas desulfurization device according to claim 1, characterized in that: The lower edge of the flap is hinged on the body of the hopper, and a torsion spring is provided between the flap and the body of the hopper, and the torsion spring provides an elastic force for the flap to flip upward.

3. A flue gas desulfurization device according to claim 2, characterized in that: A fixing rod is provided on the inner wall of the second tower body above the feed port, and the front end of the fixing rod extends toward the direction of the traction chain. When the hopper moves upward, its flap can be stopped by the fixing rod and flipped downward.

4. A flue gas desulfurization device according to claim 3, characterized in that: An inclined guide plate is provided through the feed port, the left half of the guide plate is located in the second tower barrel, and the right half is located in the first tower barrel. The left half of the guide plate extends toward the direction of the traction chain to receive the material flowing down from the flap, and the right half of the guide plate extends to above the extrusion working part of the corresponding crushing and grinding roller.

5. A flue gas desulfurization device according to claim 4, characterized in that: The upper end of the left half of the guide plate is connected with an elastic avoidance plate extending toward the lower side of the hopper flap.

6. A flue gas desulfurization device according to any one of claims 1 to 5, characterized in that: The feed port and the discharge port are provided with opening and closing doors, which are driven by an electric control drive mechanism. When the hopper moves to the corresponding feed port and the discharge port, the opening and closing doors open, and when the hopper leaves the corresponding feed port and the discharge port, the opening and closing doors close.

7. A flue gas desulfurization device according to any one of claims 1 to 5, characterized in that: A turbine buffer nozzle is provided at the outlet of the air supply pipe.

8. A flue gas desulfurization device according to any one of claims 1 to 5, characterized in that: A through hole is provided on the adjacent partitions at the bottom of the first and second tower bodies, which penetrates the first and second tower bodies. An elastic diaphragm is provided at the through hole. The elastic diaphragm has a slit that opens when a set pressure is reached to prevent excessive air pressure in the second tower body.

9. A flue gas desulfurization device according to any one of claims 1 to 5, characterized in that: The vibrating screen comprises a screen, an elastic support seat and a vibrator, and the angle between the screen and the horizontal plane is 5-15 degrees.

10. The flue gas desulfurization device according to claim 3, characterized in that: The front end of the fixing rod is provided with an elastic metal section, and a steel ball is arranged on the front end of the elastic metal section for rolling.

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