Flue gas desulfurization system

Abstract

The invention relates to the technical field of sintering, and provides a flue gas desulfurization system which comprises a trapping cylinder, the trapping cylinder is provided with a conical cavity, the cavity wall of the conical cavity is provided with an inlet, a plurality of outlets and a gas flow port, the inlet is arranged along the tangent line of the conical cavity, the outlets are arranged along the axial direction of the conical cavity, and the gas flow port is communicated with the conical cavity. The multiple airflow ports are located on one side of the outlet and arranged in the axial direction of the conical cavity, the trapping blade set is rotationally arranged in the conical cavity, the rotating axis of the trapping blade set and the axis of the conical cavity are coaxially arranged, and the multiple baffles are arranged in the conical cavity. The multiple baffles are arranged on one sides of the multiple airflow openings in a one-to-one correspondence mode and used for preventing particulate matter from entering the airflow openings. By means of the technical scheme, the technical problem that in the prior art, the treatment cost of flue gas dust collected in flue gas wet desulphurization equipment is high is solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of sintering technology, and in particular, to a flue gas desulfurization system. Background Art

[0002] The sintering machine produces a large amount of dusty flue gas. Every ton of sintered ore produces about 4000-6000m³ of flue gas, and its dust content is similar to that of a blast furnace. Therefore, the dust treatment of sintering flue gas is the key to ironmaking. The existing technology first separates large-size dust by centrifugal force through a cyclone dust collector, and then uses a bag filter to collect the remaining dust. The collected dust is returned to the sintering batching system after treatment.

[0003] The larger particles in the sintering machine flue gas dust are often enriched with a variety of metal elements with economic value. Take iron as an example. In some specific sintering raw materials, the iron element will gradually migrate and be enriched in the larger dust particles during the sintering process. By recycling these larger dust particles and further beneficiation treatment, high-purity iron metal can be extracted, which has significant market value. Similarly, the content of metal elements such as iron, lead, and zinc in larger dust particles is also relatively high, with considerable economic recovery value.

[0004] The recovered dust is returned to the sintering batching system as a return ore, which can optimize the composition of sintering raw materials, improve the quality and output of sintered ore, and indirectly reduce the total cost of steel production. In actual production, the particle size of most dust in sintering flue gas can meet the return ore requirements. In addition, there are larger dust particles with higher economic value. After proper treatment, they can be used to manufacture products such as heavy concrete or magnetic concrete, thereby reducing the production cost of these building materials and improving product quality.

[0005] However, the existing bag dust collector is for flue gas pre-collected by the cyclone dust collector. Due to technical limitations, the cyclone dust collector has a low collection rate for large particles, resulting in high pressure on the bag dust collector. The large particles entering the bag affect the particle size of the collected dust, accumulate and wear the bag, and reduce its service life and effect. Flue gas dust has high economic benefits, and the return ore needs to be screened for particle size. The dust impurities collected by the bag cannot be directly used. Although the cyclone dust collector can be used directly after screening, the collection volume is small. Dry or wet desulfurization is often used after dust removal. Due to wear problems, it is difficult to achieve efficient removal of particulate matter and ensure stable operation of wet desulfurization. When capturing particulate matter in the traditional wet flue gas desulfurization system, the bag dust collector will reduce its efficiency after a period of use, resulting in the gas-liquid interface being easily contaminated by dust, the desulfurization reaction rate and efficiency are reduced, the cost is increased, and the pipeline is easily blocked, which affects the operation of the system, increases maintenance costs and workload, and also blocks the spray nozzle, reducing the desulfurization effect. Therefore, it is urgent to design a device that can improve the dust recovery rate, reduce the bag collection rate of large-particle dust, and improve the dust collection effect of the previous collection process. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the embodiments of the present disclosure provide a flue gas desulfurization system, which solves the technical problem of high cost of treating flue gas dust collected in the wet flue gas desulfurization equipment in the prior art.

[0007] According to one aspect, at least one embodiment of the present disclosure provides a flue gas desulfurization system, comprising: A collecting cylinder, wherein the collecting cylinder has a conical cavity, the cavity wall of the conical cavity has an inlet, an outlet and an air flow opening, the inlet is arranged along the tangent of the conical cavity, the outlets are in a plurality and arranged along the axial direction of the conical cavity, and the air flow openings are in a plurality and are located on one side of the outlet and arranged along the axial direction of the conical cavity; A collecting leaf group, wherein the collecting leaf group is rotatably arranged in the conical cavity, and the rotation axis of the collecting leaf group is coaxially arranged with the axis of the conical cavity; Baffles, there are a plurality of baffles, and the plurality of baffles are arranged one by one on one side of the plurality of air flow openings, and the baffles are used to block particles from entering the air flow openings.

[0008] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the flue gas desulfurization system further includes: A spiral guide plate, wherein the spiral guide plate is arranged on the inner wall of the conical cavity, the spiral guide plate and the inner wall of the conical cavity form a spiral guide groove, the baffle is arranged in the spiral guide groove and arranged along the axis of the conical cavity, the air flow port and the inlet are respectively located on both sides of the baffle, and the outlet is located on the side of the baffle close to the inlet; A dust collecting member, the outlet leads to the dust collecting member.

[0009] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the collection leaf group includes: A rotating shaft, the rotating shaft is rotatably disposed in the conical cavity; The collecting blades are arranged on the rotating shaft. There are several collecting blades arranged along the circumference of the axis of the rotating shaft. There is a gap between the collecting blades and the spiral guide plate. An air passage groove is formed between two adjacent collecting blades. The air passage groove is inclined upward and toward the spiral guide plate.

[0010] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the collecting blades have a material guide groove, and the number of the material guide grooves is such that when the collecting blades are located on one side of the inlet during the rotation of the collecting blade group, the material guide grooves face the inlet.

[0011] For example, in a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the conical cavity further has a collecting port, the collecting port leads to the dust collecting member, and the material guide trough leads to the collecting port.

[0012] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the baffle has an arc-shaped material baffle portion, which is arranged on the side of the baffle close to the edge of the spiral guide plate, and the arc-shaped material baffle portion forms a guide groove, which leads to the outlet.

[0013] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the flue gas desulfurization system further includes: A negative pressure fan, the material guide chute leads to the negative pressure fan; A lifting member, the lower end of which is lifted and lowered in the conical cavity, the upper end of which passes through the collecting cylinder and is located above the collecting blades, and the lifting member has a collision end, which is used to collide with the upper end of the collecting blade group after the lifting member descends.

[0014] For example, in at least one embodiment of the present disclosure, a flue gas desulfurization system is provided, wherein the lifting member comprises: A lifting platform, the lower end of which is lifted and disposed in the conical cavity, and the upper end of which passes through the collecting cylinder; A rotating member, the rotating member is rotatably disposed on the lifting platform and is coaxially disposed with the tapered cavity; The swinging member is swingably arranged on the rotating member, and the swinging member is arranged in a plurality of circles. The swinging member has the collision end, and the collision end is also used to collide with the upper end of the spiral guide plate.

[0015] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the flue gas desulfurization system further includes: An annular tube, wherein the annular tube is arranged along the axis of the conical cavity and is located outside the collecting cylinder, and the air flow port leads to the annular tube; A cooling pipe, wherein the cooling pipe is spirally arranged on the inner side of the wall of the annular pipe; An electrostatic precipitator, the annular pipe leading to the electrostatic precipitator; A wet desulfurization device, wherein the electrostatic precipitator leads to the wet desulfurization device; A ring cooler, to which the wet desulfurization device leads; a reflux pipe, to which the annular cooler leads; A sintering machine, the return pipe leads to the sintering machine, and the sintering machine leads to the inlet.

[0016] For example, at least one embodiment of the present disclosure provides a flue gas desulfurization system, wherein the flue gas desulfurization system further includes: A draught fan is provided in a plurality of numbers, and the plurality of draught fans are respectively arranged between the electrostatic precipitator and the cooling pipe and between the return pipe and the sintering machine.

[0017] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, dust-laden flue gas forms a vortex after entering the conical cavity along the tangential direction. Dust particles are thrown toward the wall of the collection tube under the action of centrifugal force and push the collection blade group to rotate. When the collection blade group rotates, it changes the motion state of the airflow, so that particles with larger particle sizes collide and agglomerate and are captured, thereby enhancing the particle capture effect. The baffle is set on one side of the airflow outlet, and uses inertial force to block particulate dust outside the airflow outlet, prevent pipeline blockage, and extend the service life of the entire system. The outlets arranged axially and the annular tube form a multi-stage airflow channel, so that particles of different particle sizes can be discharged from different heights under the action of centrifugal force, thereby achieving refined capture.

[0018] Compared with the existing technology, the collection blade group improves the particle collection effect, thereby reducing the dust content entering the wet desulfurization process, thereby reducing the adverse effects of particulate matter on wet desulfurization. The dust particles reduced by centrifugal separation reduce the gas-liquid interface pollution during wet desulfurization, reduce the average particle size of the desulfurization liquid droplets, increase the mass transfer area, and improve the reaction rate.

[0019] At the same time, the setting of the baffle not only avoids the blockage of the annular pipe, but also reduces the blockage rate of the spray nozzle during the wet desulfurization process, improves the coverage rate of the wet desulfurization liquid, ensures uniform contact between the desulfurizer and the flue gas, and reduces local desulfurization blind spots.

[0020] After the dust concentration in the collection tube is reduced, the solid suspended matter content in the desulfurization liquid is reduced, the frequency of agent regeneration is reduced, and the effective utilization rate of the desulfurization agent is improved. After pre-dust removal, the dust content of the flue gas is lower than the design threshold of the wet desulfurization tower, which reduces the demister load in the desulfurization tower, reduces the demister pressure difference, prolongs the flushing cycle, and indirectly improves the stability of the desulfurization system.

[0021] In the application scenario where large-particle dust is used for returned ore, compared with the existing technology, the dust collected by the dust collection device is often a mixture of large and small particles, which is mixed with more impurities. When these mixed dusts are used for returned ore, a complex and costly impurity removal process is required. Because the presence of dust particles that are too large or too small and other impurities will affect the quality and performance of the returned ore. Too much small-particle dust leads to poor air permeability during the sintering process, affecting the quality of the sintered ore, and thus reducing the quality of steel products. Impurities directly affect product quality. In order to remove these impurities, companies need to invest a lot of manpower, material resources and time costs, including the use of screening, magnetic separation and other means to remove impurities, which undoubtedly increases the complexity of production and operating costs.

[0022] The flue gas desulfurization system achieves efficient collection of larger dust particles through the design of the collecting tube, collecting blade group and baffle. The dust has high purity and can be used for return ore directly or only after simple screening. This greatly reduces the workload and cost of impurity removal after dust collection by the dust collector. Since large dust particles contain less impurities and small particles, the quality of the returned ore can be significantly improved when used for return ore. High-quality return ore can optimize the composition of sintering raw materials, improve the key indicators such as the strength and particle size distribution of sintered ore, and thus improve the quality and production efficiency of steel products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the present disclosure; Figure 2 for Figure 1 A schematic cross-sectional view of the capture cylinder in the embodiment of FIG. Figure 3 for Figure 1 A schematic cross-sectional structural diagram of the capture cylinder from another perspective in the embodiment; Figure 4 for Figure 2 A schematic diagram of the enlarged structure of A in the embodiment of the invention; Figure 5 for Figure 3 A schematic diagram of the enlarged structure of B in the embodiment of FIG. Figure 6 for Figure 1 A schematic diagram of a flow chart of an embodiment of the present invention.

[0025] In the figure: collecting cylinder-1, conical cavity-101, inlet-102, outlet-103, air flow port-104, collecting port-105, collecting blade group-2, rotating shaft-201, collecting blade-202, gap-203, air passage groove-204, material guide groove-205, annular tube-3, baffle-4, arc-shaped material blocking part-401, guide groove-402, spiral guide plate-5, spiral guide groove-501, dust collecting part-6, negative pressure fan-7, lifting part-8, lifting platform-801, rotating part-802, swinging part-803, collision end-804, cooling pipe-9, electrostatic precipitator-10, wet desulfurization device-11, ring cooler-12, reflux pipe-13, sintering machine-14, drainage fan-15. DETAILED DESCRIPTION The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0026] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0027] In this document, it should be noted that, 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 ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0028] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0030] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] like Figure 1 to Figure 6 As shown, it shows a flue gas desulfurization system in an embodiment of the present disclosure, including a collecting tube 1, the collecting tube 1 has a conical cavity 101, the cavity wall of the conical cavity 101 has an inlet 102, an outlet 103 and an air flow port 104, the inlet 102 is arranged along the tangent of the conical cavity 101, there are a plurality of outlets 103, which are arranged along the axial direction of the conical cavity 101, there are a plurality of air flow ports 104, which are located on one side of the outlet 103 and arranged along the axial direction of the conical cavity 101, the collecting leaf group 2 is rotatably arranged in the conical cavity 101, the rotation axis of the collecting leaf group 2 is coaxial with the axis of the conical cavity 101, there are a plurality of baffles 4, and the baffles 4 are arranged one by one on one side of the plurality of air flow ports 104, and the baffles 4 are used to block particulate matter from entering the air flow port 104.

[0032] For example, Figure 1~Figure 5 As shown, dust-laden flue gas forms a vortex after entering the conical cavity 101 along the tangential direction. Dust particles are thrown toward the wall of the collection tube under the action of centrifugal force, and push the collection blade group 2 to rotate. When the collection blade group 2 rotates, it changes the motion state of the airflow, so that particles with larger particle sizes collide and agglomerate and are captured, thereby enhancing the particle capture effect. The baffle 4 is arranged on one side of the airflow port 104, and uses inertial force to block particulate dust outside the airflow port, prevent pipeline blockage, and extend the service life of the entire system. The outlet 103 arranged axially and the annular tube 3 form a multi-stage airflow channel, so that particles of different particle sizes can be discharged from different heights under the action of centrifugal force, thereby achieving refined capture.

[0033] Compared with the prior art, the collection blade group 2 improves the particle collection effect, thereby reducing the dust content entering the wet desulfurization process, thereby reducing the adverse effects of particulate matter on wet desulfurization. The dust particles reduced by centrifugal separation reduce the gas-liquid interface pollution during wet desulfurization, reduce the average particle size of the desulfurization liquid droplets, increase the mass transfer area, and improve the reaction rate.

[0034] At the same time, the setting of the baffle 4 not only avoids the blockage of the annular pipe 3, but also reduces the blockage rate of the spray nozzle during the wet desulfurization process, improves the coverage rate of the wet desulfurization liquid, ensures uniform contact between the desulfurizer and the flue gas, and reduces local desulfurization blind spots.

[0035] After the dust concentration in the collecting tube 1 is reduced, the content of suspended solids in the desulfurization liquid is reduced, the frequency of agent regeneration is reduced, and the effective utilization rate of the desulfurization agent is improved. The dust content of the flue gas after pre-dust removal is lower than the design threshold of the wet desulfurization tower, which reduces the load of the demister in the desulfurization tower, reduces the demister pressure difference, prolongs the flushing cycle, and indirectly improves the stability of the desulfurization system.

[0036] In the application scenario where large-particle dust is used for returned ore, compared with the existing technology, the dust collected by the dust collection device is often a mixture of large and small particles, which is mixed with more impurities. When these mixed dusts are used for returned ore, a complex and costly impurity removal process is required. Because the presence of dust particles that are too large or too small and other impurities will affect the quality and performance of the returned ore. Too much small-particle dust leads to poor air permeability during the sintering process, affecting the quality of the sintered ore, and thus reducing the quality of steel products. Impurities directly affect product quality. In order to remove these impurities, companies need to invest a lot of manpower, material resources and time costs, including the use of screening, magnetic separation and other means to remove impurities, which undoubtedly increases the complexity of production and operating costs.

[0037] The flue gas desulfurization system achieves efficient collection of larger dust particles through the structural design of the capture tube 1, the capture blade group 2 and the baffle 4. The dust has a high purity and can be used for return ore directly or only after simple screening. This greatly reduces the workload and cost of impurity removal after dust collection by the dust collector. Since large dust particles contain less impurities and small particles, when used for return ore, the quality of the return ore can be significantly improved. High-quality return ore can optimize the composition of sintering raw materials, improve key indicators such as the strength and particle size distribution of sintered ore, and thus improve the quality and production efficiency of steel products.

[0038] In some examples, the flue gas desulfurization system also includes a spiral guide plate 5, which is arranged on the inner wall of the conical cavity 101, and the spiral guide plate 5 and the inner wall of the conical cavity 101 form a spiral guide groove 501, the baffle 4 is arranged in the spiral guide groove 501, and is arranged along the axis of the conical cavity 101, the air flow port 104 and the inlet 102 are respectively located on both sides of the baffle 4, the outlet 103 is located on the side of the baffle 4 close to the inlet 102, and the outlet 103 leads to the dust collecting part 6.

[0039] For example, Figure 2~Figure 3As shown, the spiral guide groove 501 converts the flue gas entering tangentially into a spiral descending airflow, so that the dust particles are accelerated to collide with the wall of the conical cavity 101 under the synergistic effect of centrifugal force and gravity, thereby accelerating the sedimentation, and at the same time realizing directional guidance of the airflow. The baffle 4 is embedded in the spiral guide groove 501, and while guiding the airflow, it uses inertial collision to intercept some of the agglomerated particles to prevent them from entering the airflow port 104. The outlet 103 leads to the dust collecting part 6, so that the separated particles are collected and discharged, avoiding the problem of secondary dust in traditional equipment. The baffle 4 and the airflow port 104 are respectively located on both sides of the baffle 4, and cooperate with the guiding effect of the spiral guide groove 501 to make the dust slide along the groove wall to the dust collecting part 6, and the blockage frequency of the airflow port 104 is reduced.

[0040] In this example, the outlet 103 is connected to the dust collecting piece 6 through a pipeline, and the dust collecting cavity of the dust collecting piece 6 is connected to the conical cavity 101, so that the air pressure of the dust collecting cavity is consistent with that of the conical cavity 101. When the particulate dust hits the baffle 4, it loses kinetic energy and slides into the outlet 103 under the action of the baffle 4. Because the airflow port 104 is connected to the outside world and related equipment will create a negative pressure environment at the airflow port 104, after the airflow passes through the baffle 4, the gas will be discharged from the airflow port 104 located on the other side of the baffle 4 under the action of negative pressure. Because the dust in the airflow is guided to the outlet 103 by the baffle 4, the particulate content of the airflow entering the next process is reduced.

[0041] In some examples, the collecting blade group 2 includes a rotating shaft 201, which is rotatably disposed in the conical cavity 101, and collecting blades 202 are disposed on the rotating shaft 201. There are a plurality of collecting blades 202, which are arranged along the axial circumference of the rotating shaft 201. There is a gap 203 between the collecting blades 202 and the spiral guide plate 5, and an air groove 204 is formed between two adjacent collecting blades 202, and the air groove 204 is inclined upward and toward the spiral guide plate 5.

[0042] For example, Figure 2~Figure 3As shown, the rotation of the collecting blade 202 will generate turbulence, causing some smaller particles to collide and agglomerate into large particles under the action of turbulence. Combined with the inclined guidance of the air passage 204, the agglomerated dust is guided to the spiral guide groove 501 or to the bottom of the air passage 204, thereby improving the removal efficiency of particles. The gap 203 between the collecting blade 202 and the spiral guide plate 5 allows air flow to flush, preventing dust from accumulating on the edge of the collecting blade 202. At the same time, the rotating collecting blade 202 moves periodically, so that the gas can clean the agglomerated particles in the gap 203. The air passage 204 extends upward and toward the spiral guide plate 5. The dust-laden airflow is guided downward along the spiral path of the air passage 204 through the air passage 204 to achieve sedimentation, so that the dust is accelerated to collide under the superposition of centrifugal force and gravity, thereby achieving sedimentation. The collecting blades 202 are evenly distributed along the circumference to form a 360° guide structure. The rotation direction of the collecting blades 202 is consistent with the rotation direction of the spiral guide groove 501, forming a spiral airflow field in the same direction, so that the dust particles migrate along the groove wall toward the dust collecting piece 6, thereby reducing the escape rate. Efficient collection of large dust particles is achieved, and the collected dust has a high purity. These large dust particles can be used for return ore directly or only after simple screening treatment, which greatly reduces the workload and cost of impurity removal after dust collection by the dust collecting device. Due to the small content of impurities and small particles in large dust particles, the quality of the return ore can be significantly improved when used for return ore. High-quality return ore can optimize the composition of sintering raw materials, improve key indicators such as the strength and particle size distribution of sintered ore, thereby improving the quality and production efficiency of steel products, and bringing economic and environmental benefits to steel companies.

[0043] In some examples, the collecting blade 202 has a plurality of guide grooves 205 , and the guide grooves 205 are configured such that when the collecting blade assembly 2 is rotating and the collecting blade 202 is located on one side of the inlet 102 , the guide grooves 205 face the inlet 102 .

[0044] For example, Figure 2~Figure 3 As shown, when the collecting blade 202 rotates to the side of the inlet 102, the opening of the guide groove 205 is precisely aligned with the inlet airflow. The collecting blade 202 is a spiral blade. The spiral-shaped collecting blade 202 makes the guide groove 205 have a certain angle with the flow direction of the intake airflow when the airflow of the inlet 102 is blown into the conical cavity 101. Through this angle, the guide groove 205 of the entire page is aligned with the inlet 102 in sequence, and the alignment effect is more precise, which guides the high-speed dust-containing flue gas into the spiral guide groove 501, so that the particulate matter enters the guide groove 205 and collides with the groove wall of 205, thereby improving the collection efficiency.

[0045] The guide groove 205 opens toward the inlet 102. During the rotation, the high-speed airflow scours the groove wall to prevent dust deposition. The surface can be treated with Teflon coating to increase the surface smoothness, thereby extending the blocking period of the guide groove 205. The guide groove 205 collects the lighter particles in the dust-laden airflow, and the rotation direction of the blade is consistent with the rotation direction of the spiral guide groove 204, forming a spiral airflow field in the same direction, so that the dust particles migrate along the groove wall toward the dust collecting member 6, and the escape rate is reduced.

[0046] In some examples, the conical cavity 101 further has a collecting port 105 , the collecting port 105 leads to the dust collecting member 6 , and the material guiding trough 205 leads to the collecting port 105 .

[0047] For example, Figure 3 As shown, the guide trough 205 leads directly to the collection port 105, so that the captured dust slides down the trough wall to the dust collecting part 6 by gravity, the particle discharge efficiency is improved, and the dust retention in the internal system is reduced. When the collecting blade 202 rotates to the side of the inlet 102, the opening of the guide trough 205 is precisely aligned with the collection port 105, and the coarse particles in the dust-laden flue gas are directly introduced into the dust collecting part 6, reducing the circulating load of the particles in the system. The collection port 105 is located below the end of the spiral guide groove 501. When rotating, the power of the airflow throws the dust to the bottom, and cooperates with the closed structure of the dust collecting part 6 to prevent the dust from mixing back into the settling flue gas area, and reduce the fluctuation of the emission concentration.

[0048] In some examples, the baffle 4 has an arc-shaped material-blocking portion 401 , which is disposed on one side of the baffle 4 close to the edge of the spiral guide plate 5 . The arc-shaped material-blocking portion 401 forms a guide groove 402 , which leads to the outlet 103 .

[0049] For example, Figure 5 As shown, the arc-shaped material blocking part 401 adopts an arc design. The turbulence generated by the airflow impacting the baffle makes the particles further agglomerated, while reducing the kinetic energy loss of the dust particles, thereby improving the dust removal efficiency. The guide groove 402 leads to the outlet 103 at a certain angle, and directly guides the intercepted dust particles into the dust collecting part 6 to prevent them from circulating in the cavity, thereby reducing the dust retention in the system. The arc-shaped guide makes it difficult for the airflow to carry away the agglomerated particles and cause secondary dust when the airflow passes through the baffle area, thereby improving the capture effect of the particles.

[0050] In some examples, the flue gas desulfurization system also includes a negative pressure fan 7, the material guide trough 205 leads to the negative pressure fan 7, the lower end of the lifting member 8 is lifted and set in the conical cavity 101, the upper end of the lifting platform 801 passes through the collection cylinder 1 and is located above the collection blades 202, and the lifting member 8 has a collision end 804. After the lifting member 8 descends, the collision end 804 is used to collide with the upper end of the collection leaf group 2.

[0051] For example, Figure 1As shown, the guide trough 205 is connected to the negative pressure fan 7. The negative pressure generated by the negative pressure fan 7 can form a strong suction force in the guide trough 205, and quickly suck away the dust in the guide trough 205 on the collecting blade 202. Compared with the traditional dust removal method relying on gravity or natural airflow, this active suction method can greatly improve the dust discharge efficiency and effectively reduce the residence time and accumulation of dust in the system. The dust is quickly discharged from the system, so that the dust concentration in the conical cavity 101 is significantly reduced. This not only reduces the interference of dust on the desulfurization reaction, but also reduces the wear of dust on the equipment.

[0052] The collision end 804 of the lifting member 8 periodically collides with the upper end of the collection blade group 2, and the vibration generated can effectively remove the dust attached to the collection blade 202. As the operating time increases, dust will gradually accumulate on the collection blade 202, affecting its collection efficiency and airflow distribution. Through this impact cleaning method, the collection blade 202 can be kept in good working condition, ensuring that its dust collection efficiency is always maintained at a high level. After removing the dust accumulation on the collection blade 202, the airflow distribution of the flue gas in the conical cavity 101 can be made more uniform. Uniform airflow distribution is conducive to improving the stability and efficiency of the desulfurization reaction, avoiding the reduction of dust collection effect due to local poor airflow, and avoiding dust affecting the efficiency of desulfurization. Reducing dust accumulation on the collection blade 202 reduces the wear and corrosion of the blade by dust, thereby extending the service life of the collection blade group 2. At the same time, it also reduces the number of equipment failures and repairs caused by dust accumulation, and reduces operating costs.

[0053] In some examples, the lifting member 8 includes a lifting platform 801, the lower end of the lifting platform 801 is lifted and set in the conical cavity 101, the upper end of the lifting platform 801 passes through the collecting tube 1, the rotating member 802 is rotatably set on the lifting platform 801 and is coaxially arranged with the conical cavity 101, the swinging member 803 is swingably set on the rotating member 802, the swinging member 803 is arranged in a plurality of circles, and the swinging member 803 has a collision end 804, and the collision end 804 is also used to collide with the upper end of the spiral guide plate 5.

[0054] For example, Figure 2~Figure 3 As shown, the lifting platform 801 can be flexibly raised and lowered in the conical cavity 101, and can be accurately adjusted to the height position of the collecting leaf group 2 and the spiral guide plate 5 according to the actual operation situation. When a lot of dust accumulates on the upper part of the collecting leaf group 2 or the upper end of the spiral guide plate 5, the lifting platform 801 can be quickly lowered to the corresponding position, providing an accurate position basis for subsequent cleaning operations, avoiding the problem of incomplete cleaning that may exist in fixed position cleaning.

[0055] The rotating member 802 is coaxially arranged with the conical cavity 101 and can rotate on the lifting platform 801, so that the swinging member 803 installed thereon can make a circular motion around the axis of the conical cavity 101. This means that the collision end 804 of the swinging member 803 can perform a dust cleaning operation on the entire circumferential direction of the collecting leaf group 2 and the spiral guide plate 5, avoiding the blind corner of dust cleaning. The particles are separated from the collecting leaf group 2 and the spiral guide plate 5 by collision, and combined with the negative pressure fan 7, it is ensured that no dust will enter the air flow port 104 during cleaning.

[0056] In some examples, the flue gas desulfurization system also includes an annular pipe 3, which is a plurality of annular pipes 3 arranged along the axis of the conical cavity 101 and located on the outside of the collection tube 1, the air flow port 104 leads to the annular pipe 3, the cooling pipe 9 is spirally arranged on the inner side of the pipe wall of the annular pipe 3, the annular pipe 3 leads to the electrostatic precipitator 10, the electrostatic precipitator 10 leads to the wet desulfurization device 11, the wet desulfurization device 11 leads to the annular cooler 12, the annular cooler 12 leads to the reflux pipe 13, the reflux pipe 13 leads to the sintering machine 14, and the sintering machine 14 leads to the inlet 102.

[0057] For example, Figure 5~Figure 6 As shown, the cooling pipe 9 is spirally arranged on the inner side of the tube wall of the annular tube 3, which can effectively exchange heat with the flue gas in the annular tube 3 and reduce the flue gas temperature. Create suitable temperature conditions for the stable operation of subsequent equipment. In the process of reducing the flue gas temperature, some dust in gaseous or fine particles at high temperature will condense into larger particles due to the temperature drop, which is convenient for subsequent dust collection and treatment. This helps to improve the dust capture efficiency of the electrostatic precipitator 10 and reduce the escape of fine dust. The electrostatic precipitator 10 can use the electric field force to efficiently capture the dust in the flue gas, remove most of the fine dust particles, effectively reduce the dust load of the wet desulfurization device 11, and prevent the dust from clogging and wearing the desulfurization equipment. Through the pretreatment of the electrostatic precipitator 10, the dust content of the flue gas entering the wet desulfurization device 11 is significantly reduced, so that the desulfurizer can more fully contact and react with harmful gases such as sulfur dioxide, thereby improving the desulfurization efficiency and the utilization rate of the desulfurizer.

[0058] The design of the collecting blade group 2 and the inclined baffle 4 improves the dust collection efficiency of the collecting barrel 1. The rotating shaft 201 in the collecting blade group 2 drives the multiple collecting blades 202 to rotate, generating turbulence in the conical cavity 101, throwing the dust particles to the barrel wall, and cooperating with the air grooves 204 arranged along the circumference and tilted upward and toward the spiral guide plate 5, guiding the dust-laden airflow to better participate in the separation process. The arc-shaped material blocking part 401 on the inclined baffle 4 can effectively change the direction of the airflow and reduce turbulence losses, and the guide groove 402 directs the intercepted dust to the outlet 103 and leads to the dust collecting part 6.

[0059] The dust collected by the collecting tube 1 can be directly returned to the mine, reducing the dust content entering the subsequent electrostatic precipitator 10, wet flue gas desulfurization device 11 and other equipment. This not only reduces the dust processing load of the subsequent equipment, reduces equipment wear and maintenance frequency, but also significantly increases the dust return rate to the mine, realizes efficient recycling of resources, and improves the economic and environmental benefits of the entire flue gas desulfurization system.

[0060] The wet desulfurization device 11 can perform deep desulfurization on the flue gas after the electrostatic precipitator treatment, and effectively remove the acidic gases such as sulfur dioxide therein. In the process of wet desulfurization, some other pollutants, such as nitrogen oxides, heavy metals, etc., can also be removed in a coordinated manner to further purify the flue gas and improve the comprehensive environmental protection benefits of the system. The ring cooler 12 can cool the flue gas after the wet desulfurization treatment, and at the same time send the cooled flue gas back to the sintering machine 14 through the return pipe 13 to realize the recycling of the flue gas. This not only saves energy, reduces the introduction of fresh air, but also reduces the operating cost of the system. The return pipe 13 returns the flue gas cooled by the ring cooler 12 to the sintering machine 14, forming a circular economy model. Part of the waste heat and usable components in the flue gas can be reused, reducing the waste of resources and improving the comprehensive utilization rate of the system. The setting of the return pipe 13 and the sintering machine 14 enables the entire flue gas desulfurization system to form a closed-loop operation system, which improves the stability of the system. The dependence on the external environment is reduced, and the impact of changes in external factors on the system operation is also reduced, ensuring that the system can operate continuously and stably to achieve efficient dust collection and desulfurization effects. The circulating gas can enrich the low-content gas of sulfur dioxide after passing through the sintering machine 14, and then pass through the wet desulfurization device 11 for desulfurization again. The circulating gas prevents the sulfur dioxide that is difficult to remove from entering the atmosphere.

[0061] In some examples, a flue gas desulfurization system further includes a induced draft fan 15 , which is provided in a plurality of numbers. The plurality of induced draft fans 15 are respectively provided between the electrostatic precipitator 10 and the cooling pipe 9 and between the return pipe 13 and the sintering machine 14 .

[0062] For example, Figure 6As shown, a draft fan 15 is provided between the electrostatic precipitator 10 and the cooling pipe 9, which can effectively stabilize the flue gas flow rate and pressure in this interval. During the operation of the electrostatic precipitator 10, the electric field inside it may cause a certain change in the flow rate and pressure of the flue gas. The draft fan 15 can adjust the flue gas before entering the electrostatic precipitator 10 to ensure that a stable flow rate and pressure enter the electrostatic precipitator 10. The draft fan 15 can avoid the situation where part of the captured dust is re-raised and discharged with the flue gas due to excessive pressure fluctuations at the outlet of the electrostatic precipitator 10. A stable pressure environment helps to maintain the efficient operation of the electrostatic precipitator 10 and ensure its dust capture efficiency. The draft fan 15 provided between the return pipe 13 and the sintering machine 14 can provide power for the circulation of the flue gas, ensuring that the flue gas cooled by the ring cooler 12 can smoothly flow back to the sintering machine 14. By properly adjusting the rotation speed and air volume of the induced draft fan 15, a stable circulation of the flue gas can be achieved, thereby improving the recovery rate of the waste heat and usable components in the flue gas.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A flue gas desulfurization system, characterized in that: include: A collecting cylinder (1), the collecting cylinder (1) having a conical cavity (101), the cavity wall of the conical cavity (101) having an inlet (102), an outlet (103) and an air flow opening (104), the inlet (102) being arranged along a tangent of the conical cavity (101), the outlet (103) being a plurality and arranged along the axial direction of the conical cavity (101), and the air flow opening (104) being a plurality and being located on one side of the outlet (103) and arranged along the axial direction of the conical cavity (101); A collecting leaf group (2), the collecting leaf group (2) being rotatably arranged in the conical cavity (101), and the rotation axis of the collecting leaf group (2) being coaxially arranged with the axis of the conical cavity (101); Baffles (4), there are a plurality of baffles (4), the plurality of baffles (4) being arranged one by one on one side of the plurality of airflow openings (104), the baffles (4) being used to block particles from entering the airflow openings (104).

2. A flue gas desulfurization system according to claim 1, characterized in that: The flue gas desulfurization system also includes: a spiral guide plate (5), the spiral guide plate (5) being arranged on the inner wall of the conical cavity (101), the spiral guide plate (5) and the inner wall of the conical cavity (101) forming a spiral guide groove (501), the baffle plate (4) being arranged in the spiral guide groove (501) and arranged along the axis of the conical cavity (101), the air flow port (104) and the inlet (102) being respectively located on two sides of the baffle plate (4), and the outlet (103) being located on a side of the baffle plate (4) close to the inlet (102); A dust collecting member (6), wherein the outlet (103) leads to the dust collecting member (6).

3. A flue gas desulfurization system according to claim 2, characterized in that: The collecting leaf group (2) comprises: A rotating shaft (201), the rotating shaft (201) being rotatably disposed in the conical cavity (101); A collecting blade (202), wherein the collecting blade (202) is arranged on the rotating shaft (201), and the collecting blade (202) is a plurality of blades arranged along the circumference of the axis of the rotating shaft (201), a gap (203) is provided between the collecting blade (202) and the spiral guide plate (5), and an air passage groove (204) is formed between two adjacent collecting blades (202), and the air passage groove (204) is inclined upward and toward the spiral guide plate (5).

4. A flue gas desulfurization system according to claim 3, characterized in that: The collecting blade (202) has a material guide groove (205), and the material guide groove (205) is a plurality of grooves. The material guide groove (205) is configured such that when the collecting blade group (2) is rotating and the collecting blade (202) is located on one side of the inlet (102), the material guide groove (205) faces the inlet (102).

5. A flue gas desulfurization system according to claim 4, characterized in that: The conical cavity (101) further comprises a collecting port (105), the collecting port (105) leading to the dust collecting member (6), and the material guide trough (205) leading to the collecting port (105).

6. A flue gas desulfurization system according to claim 2, characterized in that: The baffle plate (4) has an arc-shaped material stopper portion (401), the arc-shaped material stopper portion (401) being arranged on a side of the baffle plate (4) close to an edge of the spiral guide plate (5), the arc-shaped material stopper portion (401) forming a guide groove (402), and the guide groove (402) leading to the outlet (103).

7. A flue gas desulfurization system according to claim 4, characterized in that: The flue gas desulfurization system also includes: A negative pressure fan (7), the material guide trough (205) leading to the negative pressure fan (7); A lifting member (8), wherein the lower end of the lifting member (8) is lifted and arranged in the conical cavity (101), the upper end of the lifting member (8) passes through the collecting cylinder (1) and is located above the collecting blades (202), and the lifting member (8) has a collision end (804). After the lifting member (8) descends, the collision end (804) is used to collide with the upper end of the collecting blade group (2).

8. A flue gas desulfurization system according to claim 7, characterized in that: The lifting member (8) comprises: A lifting platform (801), the lower end of the lifting platform (801) being lifted and disposed in the conical cavity (101), and the upper end of the lifting platform (801) passing through the collecting cylinder (1); A rotating member (802), the rotating member (802) being rotatably disposed on the lifting platform (801) and being coaxially disposed with the conical cavity (101); A swinging member (803), the swinging member (803) is swingably arranged on the rotating member (802), the swinging member (803) is arranged in a plurality of circles, the swinging member (803) has the collision end (804), and the collision end (804) is also used to collide with the upper end of the spiral guide plate (5).

9. A flue gas desulfurization system according to claim 1, characterized in that: The flue gas desulfurization system also includes: annular tubes (3), the annular tubes (3) being a plurality and arranged along the axis of the conical cavity (101) and located outside the collecting cylinder (1), the air flow opening (104) leading to the annular tubes (3); A cooling pipe (9), the cooling pipe (9) being spirally arranged on the inner side of the wall of the annular pipe (3); An electrostatic precipitator (10), wherein the annular pipe (3) leads to the electrostatic precipitator (10); A wet desulfurization device (11), the electrostatic precipitator (10) leading to the wet desulfurization device (11); A ring cooler (12), the wet desulfurization device (11) leads to the ring cooler (12); A reflux pipe (13), the annular cooler (12) leading to the reflux pipe (13); A sintering machine (14), the return pipe (13) leads to the sintering machine (14), and the sintering machine (14) leads to the inlet (102).

10. A flue gas desulfurization system according to claim 9, characterized in that: The flue gas desulfurization system further comprises: A draught fan (15), wherein the draught fan (15) is provided in a plurality, and the plurality of draught fans (15) are respectively provided between the electrostatic precipitator (10) and the cooling pipe (9) and between the return pipe (13) and the sintering machine (14).

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