A flue gas desulfurization system

Abstract

The present disclosure relates to the field of sintering technology. The present disclosure provides a flue gas desulfurization system, which includes a capture cylinder. The capture cylinder has a conical cavity. The cavity wall of the conical cavity has an inlet, an outlet, and an air flow port. The inlet is arranged along the tangent of the conical cavity. The outlets are multiple and are arranged along the axial direction of the conical cavity. The air flow ports are multiple and are located on one side of the outlets and are arranged along the axial direction of the conical cavity. A capture blade group is rotatably arranged in the conical cavity. The rotation axis of the capture blade group is coaxially arranged with the axis of the conical cavity. The baffles are multiple. The multiple baffles are correspondingly arranged on one side of the multiple air flow ports. The baffles are used to block particulate matter from entering the air flow ports. Through the above technical solution, the technical problem of relatively high processing cost of flue gas dust collected in existing wet flue gas desulfurization equipment is solved.

Description

Technical Field

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

[0002] A large amount of dusty flue gas is generated during the operation of a sintering machine. For every 1t of sinter produced, approximately 4000 - 6000m³ of flue gas is generated. The dust content in it is similar to that of a blast furnace. Therefore, the treatment of sintering flue gas dust is crucial for ironmaking. In the prior art, large-particle dust is first separated by a cyclone dust collector relying on centrifugal force, and then the remaining dust is collected by a bag filter. The collected dust is returned to the sintering batching system after being processed.

[0003] Larger particles in the sintering machine flue gas dust often enrich various metal elements with economic value. Taking iron as an example, in some specific sintering raw materials, iron elements will gradually migrate and enrich in larger particle dust during the sintering process. By recycling and further beneficiating these larger particle dusts, high-purity iron metal can be extracted, and its market value is significant. Similarly, the contents of metal elements such as iron, lead, and zinc in larger particle dust are also relatively high, with considerable economic recovery value.

[0004] The recycled dust is returned to the sintering batching system as recycled ore, which can optimize the composition of the sintering raw materials, improve the quality and output of sinter, and thus indirectly reduce the total cost of steel production. In actual production, the particle sizes of the vast majority of the dust in the sintering flue gas can meet the requirements of recycled ore. In addition, there are also larger particle dusts, whose economic value is relatively high. After appropriate 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 the product quality.

[0005] However, the existing bag dust removal is for the flue gas pre-collected by a cyclone dust collector. Due to technical limitations, the cyclone dust collector has a low collection rate for large particles, resulting in a high pressure on the bag dust removal. The large particles entering the bag affect the particle size of the collected dust, accumulate and wear the bag, reducing its service life and effect. The economic benefits of flue gas dust are high. For the recycled ore, the particle size needs to be screened. The dust collected by the bag has many impurities and cannot be directly used. Although the cyclone dust collector can be directly used after screening, the collection amount is small. After dust removal, dry or wet desulfurization is commonly used. Due to the wear problem of the bag dust collector, it is difficult to achieve efficient particulate matter removal and ensure the stable operation of wet desulfurization. In the traditional wet flue gas desulfurization system, the efficiency of the bag dust collector will decrease after being used for a period of time when capturing particulate matter, resulting in the gas-liquid interface being easily contaminated by dust, the desulfurization reaction rate and efficiency decreasing, the cost increasing, and the pipeline being easily blocked, affecting the system operation, increasing the maintenance cost and workload, and also causing the spray nozzles to be blocked, reducing the desulfurization effect. Therefore, there is an urgent need to design a device that can improve the dust recovery rate, reduce the collection rate of the bag for large particle size dust, and enhance the dust collection effect of the previous collection process. Summary of the Invention

[0006] To overcome the above - mentioned deficiencies, embodiments of the present disclosure provide a flue gas desulfurization system, which solves the technical problem of high treatment cost of flue gas dust collected in 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, including:

[0008] A capture cylinder, the capture cylinder having a conical cavity, the cavity wall of the conical cavity having an inlet, an outlet and an air flow port, the inlet being arranged along the tangent of the conical cavity, the outlet being a plurality of, arranged along the axial direction of the conical cavity, and the air flow port being a plurality of, located on one side of the outlet and arranged along the axial direction of the conical cavity;

[0009] A capture blade group, the capture blade group being rotatably arranged in the conical cavity, and the rotation axis of the capture blade group being co - axial with the axis of the conical cavity;

[0010] Baffles, the baffles being a plurality of, and the plurality of baffles being respectively arranged on one side of the plurality of air flow ports, and the baffles being used to block particulate matter from entering the air flow ports.

[0011] For example, in a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the flue gas desulfurization system further includes:

[0012] A spiral guide plate, the spiral guide plate being arranged on the inner wall of the conical cavity, the spiral guide plate and the inner wall of the conical cavity forming a spiral guide groove, the baffle being arranged in the spiral guide groove and arranged along the axial direction of the conical cavity, the air flow port and the inlet being respectively located on both sides of the baffle, and the outlet being located on the side of the baffle close to the inlet;

[0013] A dust collection member, and the outlet leads to the dust collection member.

[0014] For example, in a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the capture blade group includes:

[0015] A rotating shaft, the rotating shaft being rotatably arranged in the conical cavity;

[0016] Capture blades, the capture blades being arranged on the rotating shaft, the capture blades being a plurality of, arranged circumferentially along the axis of the rotating shaft, there being a gap between the capture blades and the spiral guide plate, and an air - passing groove being formed between adjacent two capture blades, the air - passing groove being inclined upward and towards the spiral guide plate.

[0017] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the collecting blade has a material guiding groove, there are a plurality of the material guiding grooves, and the material guiding grooves are configured such that when the collecting blade is on the inlet side during the rotation of the collecting blade group, the material guiding grooves face the inlet.

[0018] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the conical cavity further has a collection port, the collection port leads to the dust collection member, and the material guiding groove leads to the collection port.

[0019] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the baffle has an arc-shaped material blocking portion, the arc-shaped material blocking portion is arranged on the side of the baffle close to the edge of the spiral guide plate, the arc-shaped material blocking portion forms a guide groove, and the guide groove leads to the outlet.

[0020] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the flue gas desulfurization system further includes:

[0021] A negative pressure fan, the material guiding groove leads to the negative pressure fan;

[0022] A lifting member, the lower end of the lifting member is arranged to be lifted and lowered in the conical cavity, the upper end of the lifting member penetrates through the collecting cylinder and is located above the collecting blade, the lifting member has a collision end, and after the lifting member descends, the collision end is used to impact the upper end of the collecting blade group.

[0023] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the lifting member includes:

[0024] A lifting platform, the lower end of the lifting platform is arranged to be lifted and lowered in the conical cavity, and the upper end of the lifting platform penetrates through the collecting cylinder;

[0025] A rotating member, the rotating member is rotatably arranged on the lifting platform and is coaxially arranged with the conical cavity;

[0026] A swinging member, the swinging member is swingably arranged on the rotating member, the swinging members are arranged in a circumferential arrangement, the swinging member has the collision end, and the collision end is further used to impact the upper end of the spiral guide plate.

[0027] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure, the flue gas desulfurization system further includes:

[0028] A plurality of annular pipes, which are arranged along the axis of the conical cavity and are located outside the collecting cylinder, and the air flow port leads to the annular pipes;

[0029] A cooling pipe, which is spirally arranged on the inner side of the wall of the annular pipe;

[0030] An electrostatic precipitator, and the annular pipe leads to the electrostatic precipitator;

[0031] A wet desulfurization device, and the electrostatic precipitator leads to the wet desulfurization device;

[0032] An annular cooler, and the wet desulfurization device leads to the annular cooler;

[0033] A return pipe, and the annular cooler leads to the return pipe;

[0034] A sintering machine, the return pipe leads to the sintering machine, and the sintering machine leads to the inlet.

[0035] For example, a flue gas desulfurization system provided by at least one embodiment of the present disclosure further includes:

[0036] Draft fans, several draft fans are respectively arranged between the electrostatic precipitator and the cooling pipe and between the return pipe and the sintering machine.

[0037] The beneficial effects of the embodiments of the present disclosure are:

[0038] In the present disclosure, the dust-containing flue gas enters the conical cavity along the tangential direction and forms a swirling flow. The dust particles are thrown towards the wall of the trapping cylinder under the action of centrifugal force, and the trapping blade group is pushed to rotate. When the trapping blade group rotates, by changing the motion state of the air flow, the larger particles collide and agglomerate and are trapped, enhancing the trapping effect of the particles. The baffle is arranged on one side of the air flow port, and the particulate matter dust is blocked outside the air flow port by using the inertial force, preventing the pipeline from being blocked and prolonging the service time of the entire system. The outlets arranged axially and the annular pipe form a multi-stage air flow channel, so that particles with different particle sizes can be discharged from different heights under the action of centrifugal force, realizing refined trapping.

[0039] Compared with the prior art, the trapping blade group improves the trapping effect of the particles, thereby reducing the dust content entering the wet desulfurization process, and thus reducing the adverse impact of the particles on wet desulfurization. The reduction of dust particles by centrifugal separation reduces the pollution of the gas-liquid interface during wet desulfurization, reduces the average particle size of the desulfurization liquid droplets, increases the mass transfer area, and improves the reaction rate.

[0040] At the same time, the setting of the baffle not only avoids the blockage of the annular pipe, but also can reduce the blockage rate of the spray nozzles during the wet desulfurization process, improve the coverage rate of the desulfurization liquid in the wet desulfurization, ensure the uniform contact between the desulfurizer and the flue gas, and reduce the local desulfurization blind area.

[0041] 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.

[0042] 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.

[0043] 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

[0044] 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.

[0045] Figure 1 It is a structural schematic diagram of an embodiment of the present disclosure;

[0046] Figure 2 for Figure 1 A schematic cross-sectional view of the capture cylinder in the embodiment of FIG.

[0047] Figure 3 for Figure 1 A schematic cross-sectional structural diagram of the capture cylinder from another perspective in the embodiment;

[0048] Figure 4 forFigure 2 Schematic diagram of the enlarged structure of A in the embodiment of

[0049] Figure 5 is Figure 3 Schematic diagram of the enlarged structure of B in the embodiment of

[0050] Figure 6 is Figure 1 Schematic diagram of the process flow of the embodiment of

[0051] In the figure: collection cylinder - 1, conical cavity - 101, inlet - 102, outlet - 103, air flow port - 104, collection port - 105, collection blade group - 2, rotating shaft - 201, collection blade - 202, gap - 203, air passage groove - 204, material guiding groove - 205, annular pipe - 3, baffle - 4, arc-shaped material blocking part - 401, guiding groove - 402, spiral guiding plate - 5, spiral guiding groove - 501, dust collection 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, return pipe - 13, sintering machine - 14, induced draft fan - 15. Specific embodiments

[0052] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present disclosure, rather than limiting the present disclosure.

[0053] For the sake of simplicity of the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent their actual structures as products. In addition, for the sake of simplicity and easy understanding of the drawings, in some figures, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0054] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0055] In this disclosure, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0056] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left" and "right" are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, 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. Therefore, it should not be construed as a limitation to this disclosure.

[0057] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0058] As Figures 1 to 6 shown, it shows a flue gas desulfurization system in an embodiment of this disclosure, including a capture cylinder 1. The capture cylinder 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. The number of outlets 103 is several and they are arranged along the axis of the conical cavity 101. The number of air flow ports 104 is several and they are located on one side of the outlet 103 and arranged along the axis of the conical cavity 101. A capture blade group 2 is rotatably arranged in the conical cavity 101. The rotation axis of the capture blade group 2 is coaxial with the axis of the conical cavity 101. The number of baffles 4 is several and several baffles 4 are arranged in one-to-one correspondence on one side of several air flow ports 104. The baffle 4 is used to block particulate matter from entering the air flow port 104.

[0059] For example, as Figures 1 to 5 shown, the dusty flue gas forms a swirling flow after entering the conical cavity 101 along the tangential direction. The dust particles are thrown towards the wall of the capture cylinder under the action of centrifugal force and push the capture blade group 2 to rotate. When the capture blade group 2 rotates, by changing the motion state of the air flow, the larger-sized particulate matter collides and agglomerates and is captured, enhancing the capture effect of the particulate matter. The baffle 4 is arranged on one side of the air flow port 104 to block the particulate matter dust outside the air flow port by using the inertial force, prevent pipeline blockage and extend the service time of the whole system. The axially arranged outlets 103 and the annular pipe 3 form a multi-stage air flow channel, enabling particulate matter with different particle sizes to be discharged from different heights under the action of centrifugal force, realizing refined capture.

[0060] Compared with the prior art, the collection blade group 2 improves the particulate matter collection effect, thereby reducing the dust content entering the wet desulfurization process, and thus reducing the adverse impact of particulate matter on wet desulfurization. The dust particles reduced by centrifugal separation reduce the pollution of the gas-liquid interface during wet desulfurization, reduce the average particle size of the desulfurization liquid droplets, increase the mass transfer area, and improve the reaction rate.

[0061] Meanwhile, the setting of the baffle 4 not only avoids the blockage of the annular pipe 3, but also can reduce the blockage rate of the spray nozzles during the wet desulfurization process, improve the coverage rate of the desulfurization liquid in the wet desulfurization, ensure the uniform contact between the desulfurizing agent and the flue gas, and reduce the local desulfurization blind area.

[0062] After the dust concentration in the collection cylinder 1 is reduced, the content of solid suspended matter in the desulfurization liquid is reduced, the reagent regeneration frequency is reduced, and the effective utilization rate of the desulfurizing agent is improved. After pre-dedusting, the dust content in the flue gas is lower than the design threshold of the wet desulfurization tower, reducing the load on the demister in the desulfurization tower, reducing the differential pressure of the demister, extending the flushing cycle, and indirectly improving the stability of the desulfurization system.

[0063] In the application scenario where large particle dust is used for returning ore, compared with the prior art, the dust collected by the dust collection device is often in a mixed state of large and small particles, and there are many impurities mixed in it. When these mixed dusts are used for returning ore, complex and costly impurity removal processes are required. Because of the existence of oversized and undersized particle dusts and other impurities, the quality and performance of the returned ore will be affected. Too much small particle dust leads to poor air permeability during the sintering process, affecting the quality of sintered ore, and thus reducing the quality of steel products. Impurities directly affect the product quality. To remove these impurities, enterprises need to invest a large amount of human, material and time costs, including using various means such as screening and magnetic separation for impurity removal, which undoubtedly increases the complexity of production and operating costs.

[0064] The flue gas desulfurization system realizes the efficient collection of larger particle dust through the structural design of the collection cylinder 1, the collection blade group 2 and the baffle 4. The dust purity is relatively high and can be directly used for returning ore or only requires simple screening treatment. This greatly reduces the impurity removal workload and cost after the dust collection device collects dust. Since the content of impurities and small particles in the large particle dust is small, when used for returning ore, it can significantly improve the quality of the returned ore. High-quality returned 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.

[0065] In some examples, the flue gas desulfurization system further includes a spiral guide plate 5 disposed on the inner wall of the conical cavity 101. The spiral guide plate 5 and the inner wall of the conical cavity 101 form a spiral guide groove 501. The baffle 4 is disposed in the spiral guide groove 501 and arranged along the axis of the conical cavity 101. The air inlet 104 and the inlet 102 are respectively located on both sides of the baffle 4, and the outlet 103 is located on the side of the baffle 4 close to the inlet 102. The outlet 103 leads to the dust collecting member 6.

[0066] For example, as Figures 2 to 3 shown, the spiral guide groove 501 converts the tangentially entering flue gas into a spiral downward airflow, enabling the dust particles to accelerate the collision with the wall of the conical cavity 101 under the combined action of centrifugal force and gravity, thereby accelerating sedimentation, and at the same time achieving directional diversion of the airflow. The baffle 4 is embedded in the spiral guide groove 501. While guiding the airflow, it intercepts some agglomerated particulate matters by inertial collision to prevent them from entering the air inlet 104. The outlet 103 leads to the dust collecting member 6, enabling the separated particulate matters to be collected and discharged, avoiding the problem of secondary dust emission in traditional equipment. The baffle 4 and the air inlet 104 are respectively located on both sides of the baffle 4. With the guiding effect of the spiral guide groove 501, the dust slides down along the groove wall to the dust collecting member 6, reducing the blockage frequency of the air inlet 104.

[0067] In this example, the outlet 103 is connected to the dust collecting member 6 through a pipeline. The dust collecting cavity of the dust collecting member 6 is interconnected with the conical cavity 101, making the air pressure in the dust collecting cavity the same as that in 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. Since the air inlet 104 is connected to the outside and a negative pressure environment is created at the air inlet 104 by relevant equipment, after the airflow passes through the baffle 4, the air will be discharged from the air inlet 104 located on the other side of the baffle 4 under the action of the negative pressure. Because the dust in the airflow is guided by the baffle 4 to the outlet 103, the content of particulate matters in the airflow entering the next process is reduced.

[0068] In some examples, the trapping blade group 2 includes a rotating shaft 201 rotatably disposed in the conical cavity 101. Trapping blades 202 are disposed on the rotating shaft 201. There are several trapping blades 202, which are arranged circumferentially along the axis of the rotating shaft 201. There is a gap 203 between the trapping blades 202 and the spiral guide plate 5. An air passing groove 204 is formed between two adjacent trapping blades 202, and the air passing groove 204 is inclined upward and towards the spiral guide plate 5.

[0069] For example, as Figures 2 to 3As shown, the rotation of the capture vane 202 generates turbulence, causing some smaller particles to collide and agglomerate into larger particles under the action of the turbulence. Combining with the inclined guidance of the air passage 204, the agglomerated dust is guided to the spiral guiding groove 501 or the bottom of the air passage 204, improving the removal efficiency of particulate matter. The gap 203 between the capture vane 202 and the spiral guiding plate 5 allows the airflow to scour, preventing dust from accumulating at the edge of the capture vane 202. At the same time, the rotating capture vane 202 moves periodically, enabling the gas to clean the agglomerated particulate matter in the gap 203. The air passage 204 extends upward and faces the spiral guiding plate 5. The dust-containing airflow is guided downward along the spiral path of the air passage 204 through the air passage 204 to achieve sedimentation, causing the dust to accelerate and collide under the superposition of centrifugal force and gravity, thereby achieving sedimentation. The capture vanes 202 are evenly distributed along the circumference to form a 360° guiding structure. The rotation direction of the capture vanes 202 is the same as the spiral direction of the spiral guiding groove 501, forming a co-rotating spiral airflow field, enabling the dust particles to migrate directionally along the groove wall to the dust collecting member 6, thereby reducing the escape rate. High-efficiency collection of large-particle dust is achieved, and the collected dust has a high purity. These large-particle dusts can be directly used for returning ore or only require simple screening treatment, greatly reducing the workload and cost of impurity removal after the dust collection device collects dust. Since the content of impurities and small particles in the large-particle dust is low, the quality of the returned ore can be significantly improved when used for returning ore. High-quality returned ore can optimize the composition of the sintering raw materials, improve key indicators such as the strength and particle size distribution of sintered ore, and further improve the quality and production efficiency of steel products, bringing economic and environmental benefits to steel enterprises.

[0070] In some examples, the capture vane 202 has a material guiding groove 205. There are several material guiding grooves 205. The material guiding grooves 205 are configured such that when the capture vane group 2 rotates and the capture vane 202 is on the side of the inlet 102, the material guiding grooves 205 face the inlet 102.

[0071] For example, as Figures 2 to 3 shown, when the capture vane 202 rotates to the side of the inlet 102, the opening of the material guiding groove 205 precisely aligns with the inlet air flow. The capture vane 202 is a spiral vane. When the air flow at the inlet 102 blows into the conical cavity 101 due to the spiral-shaped capture vane 202, the material guiding groove 205 has a certain angle with the direction of the inlet air flow. Through this angle, the material guiding grooves 205 on the entire page are sequentially aligned with the inlet 102, and the alignment effect is more precise, guiding the high-speed dust-containing flue gas to the spiral guiding groove 501, enabling the particulate matter to enter the material guiding groove 205 and collide with the groove wall of 205, thereby improving the capture efficiency.

[0072] The opening of the material guiding chute 205 faces the inlet 102. During the rotation process, the high-speed air flow scours the chute wall to prevent dust deposition. The surface can be treated with a Teflon coating to increase surface smoothness, thereby extending the clogging cycle of the material guiding chute 205. The material guiding chute 205 collects the lighter particles in the dust-containing air flow. It cooperates with the rotation direction of the blades, which is the same as the direction of the spiral guiding groove 204, to form a co-directional spiral air flow field, enabling the dust particles to migrate along the chute wall towards the dust collecting member 6 and reducing the escape rate.

[0073] In some examples, the conical cavity 101 further has a collection port 105. The collection port 105 leads to the dust collecting member 6, and the material guiding chute 205 leads to the collection port 105.

[0074] For example, as Figure 3 shown, the material guiding chute 205 directly leads to the collection port 105, enabling the captured dust to slide down along the chute wall by gravity to the dust collecting member 6, improving the discharge efficiency of the particulate matter and reducing the dust retention amount in the inner system. When the capture blade 202 rotates to the side of the inlet 102, the opening of the material guiding chute 205 accurately aligns with the collection port 105, directly introducing the coarse particles in the dust-containing flue gas into the dust collecting member 6 and reducing the circulating load of the particles in the system. The collection port 105 is located below the end of the spiral guiding groove 501. When rotating, the dynamic force of the air flow flings the dust towards the bottom. Combined with the closed structure of the dust collecting member 6, it prevents the dust from mixing back into the settling flue gas area and reduces the fluctuation of the emission concentration.

[0075] In some examples, the baffle 4 has an arc-shaped material blocking portion 401. The arc-shaped material blocking portion 401 is arranged on one side of the baffle 4 close to the edge of the spiral guiding plate 5. The arc-shaped material blocking portion 401 forms a guiding groove 402, and the guiding groove 402 leads to the outlet 103.

[0076] For example, as Figure 5 shown, the arc-shaped material blocking portion 401 adopts an arc design. The turbulent flow generated by the air flow impacting the baffle causes the particulate matter to further agglomerate, and at the same time reduces the kinetic energy loss of the dust particles, thereby improving the ash discharge efficiency. The guiding groove 402 leads to the outlet 103 at a certain angle, directly introducing the intercepted dust particles into the dust collecting member 6, preventing them from circulating in the cavity, and reducing the dust retention amount in the system. The arc-shaped diversion makes the air flow pass through the baffle area. The arc-shaped structure makes it difficult for the air flow to carry away the agglomerated particulate matter and cause secondary dust emission, improving the capture effect of the particulate matter.

[0077] In some examples, the flue gas desulfurization system further includes a negative pressure fan 7. The material guiding chute 205 leads to the negative pressure fan 7. The lower end of the lifting member 8 is arranged to be lifted and lowered in the conical cavity 101. The upper end of the lifting platform 801 penetrates through the capture cylinder 1 and is located above the capture blade 202. The lifting member 8 has a collision end 804. After the lifting member 8 descends, the collision end 804 is used to impact the upper end of the capture blade group 2.

[0078] For example, as Figure 1As shown, the material guiding chute 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 material guiding chute 205, quickly sucking away the dust in the material guiding chute 205 on the dust collection blades 202. Compared with the traditional dust removal method relying on gravity or natural air flow, this active suction method can greatly improve the dust discharge efficiency, effectively reducing the residence time and accumulation amount of dust in the system. Quickly discharging the dust from the system significantly reduces the dust concentration in the conical cavity 101. This not only reduces the interference of dust on the desulfurization reaction but also reduces the wear of the equipment by dust.

[0079] The collision end 804 of the lifting member 8 regularly impacts the upper end of the dust collection blade group 2, and the generated vibration can effectively remove the dust attached to the dust collection blades 202. As the operation time increases, dust will gradually accumulate on the dust collection blades 202, affecting their dust collection efficiency and air flow distribution. Through this impact dust cleaning method, the dust collection blades 202 can be kept in good working condition, ensuring that their dust collection efficiency always remains at a relatively high level. After removing the dust accumulated on the dust collection blades 202, the air flow distribution of the flue gas in the conical cavity 101 can be made more uniform. A uniform air flow distribution is beneficial to improving the stability and efficiency of the desulfurization reaction, avoiding the reduction of the dust collection effect caused by poor local air flow and preventing dust from affecting the desulfurization efficiency. Reducing the dust accumulation on the dust collection blades 202 reduces the wear and corrosion of the blades by dust, thereby extending the service life of the dust collection blade group 2. At the same time, it also reduces the equipment failures and maintenance times caused by dust accumulation, reducing the operation cost.

[0080] In some examples, the lifting member 8 includes a lifting platform 801. The lower end of the lifting platform 801 is arranged to be lifted and lowered in the conical cavity 101. The upper end of the lifting platform 801 penetrates through the dust collection cylinder 1. The rotating member 802 is rotatably arranged on the lifting platform 801 and is coaxially arranged with the conical cavity 101. The swinging member 803 is swingably arranged on the rotating member 802. The swinging member 803 is arranged in a circular arrangement of several pieces. The swinging member 803 has a collision end 804, and the collision end 804 is also used to impact the upper end of the spiral guide plate 5.

[0081] For example, as Figures 2 to 3 shown, the lifting platform 801 can be flexibly lifted and lowered in the conical cavity 101, and can be accurately adjusted to the height positions of the dust collection blade group 2 and the spiral guide plate 5 according to the actual operation conditions. When more dust accumulates on the upper part of the dust collection blade group 2 or the upper end of the spiral guide plate 5, the lifting platform 801 can quickly descend to the corresponding position, providing an accurate position basis for subsequent dust cleaning operations and avoiding the problem of incomplete dust cleaning that may exist in fixed-position dust cleaning.

[0082] The rotating member 802 is coaxially arranged with the conical cavity 101 and can rotate on the lifting table 801, so that the swinging member 803 mounted thereon can perform 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 dust cleaning operations on the entire circumferential direction of the trapping blade group 2 and the spiral guide plate 5, avoiding dust cleaning dead corners. Through the collision, the particulate matter is separated from the trapping blade group 2 and the spiral guide plate 5, and combined with the negative pressure fan 7, it is ensured that no dust will enter the air inlet 104 during cleaning.

[0083] In some examples, the flue gas desulfurization system further includes a plurality of annular pipes 3 arranged along the axis of the conical cavity 101 and located outside the trapping cylinder 1. The air inlet 104 leads to the annular pipes 3. The cooling pipe 9 is spirally arranged on the inner side of the wall of the annular pipes 3. The annular pipes 3 lead to the electrostatic precipitator 10. The electrostatic precipitator 10 leads to the wet desulfurization device 11. The wet desulfurization device 11 leads to the ring cooler 12. The ring cooler 12 leads to the return pipe 13. The return pipe 13 leads to the sintering machine 14. The sintering machine 14 leads to the inlet 102.

[0084] For example, as Figures 5 to 6 shown, the cooling pipe 9 is spirally arranged on the inner side of the wall of the annular pipes 3, which can effectively exchange heat with the flue gas in the annular pipes 3 and reduce the flue gas temperature. It creates suitable temperature conditions for the stable operation of subsequent equipment. During the process of reducing the flue gas temperature, some dust in the form of gas or fine particles at high temperatures 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 trapping efficiency of the electrostatic precipitator 10 and reduce the escape of fine dust. The electrostatic precipitator 10 can efficiently trap the dust in the flue gas by using the electric field force, removing most of the fine dust particles, effectively reducing the dust load of the wet desulfurization device 11, and preventing the blockage and wear of the desulfurization equipment by dust. Through the pretreatment of the electrostatic precipitator 10, the dust content of the flue gas entering the wet desulfurization device 11 is significantly reduced, enabling the desulfurization agent to more fully contact and react with harmful gases such as sulfur dioxide, improving the desulfurization efficiency and the utilization rate of the desulfurization agent.

[0085] The design of the trapping blade group 2 and the inclined baffle 4 improves the dust collection efficiency of the trapping cylinder 1. The rotating shaft 201 in the trapping blade group 2 drives a plurality of trapping blades 202 to rotate, generating turbulence in the conical cavity 101, throwing the dust particles towards the cylinder wall, and cooperating with the air passing grooves 204 arranged along the circumference and inclined upward and towards the spiral guide plate 5 to guide the dust-containing air to better participate in the separation process. The arc-shaped baffle portion 401 on the inclined baffle 4 can effectively change the air flow direction, reduce the turbulence loss, and the guide groove 402 directs the intercepted dust towards the outlet 103 and leads to the dust collecting member 6.

[0086] The dust collected by the dust collection cylinder 1 can be directly returned to the ore, reducing the dust content entering subsequent equipment such as the electrostatic precipitator 10 and the wet desulfurization device 11. This not only reduces the dust treatment load of subsequent equipment, decreases equipment wear and maintenance frequency, but also significantly increases the ore return rate of the dust, realizes the efficient recycling of resources, and improves the economy and environmental protection benefits of the entire flue gas desulfurization system.

[0087] The wet desulfurization device 11 can perform deep desulfurization on the flue gas after electrostatic precipitation treatment, effectively removing acidic gases such as sulfur dioxide therein. During the wet desulfurization process, it can also synergistically remove some other pollutants, such as nitrogen oxides, heavy metals, etc., further purifying the flue gas and improving the comprehensive environmental protection benefits of the system. The ring cooler 12 can cool the flue gas after 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 sends the flue gas cooled by the ring cooler 12 back to the sintering machine 14, forming a circular economy model. Part of the waste heat and utilizable components in the flue gas are reused, reducing resource waste and increasing the comprehensive utilization rate of the system. The setting of the return pipe 13 and the sintering machine 14 makes the entire flue gas desulfurization system form a closed-loop operation system, improving the stability of the system. It reduces the dependence on the external environment, and at the same time reduces the impact on the system operation due to changes in external factors, ensuring that the system can operate continuously and stably, achieving efficient dust collection and desulfurization effects. The circulating gas can enrich the low-content sulfur dioxide gas after passing through the sintering machine 14 and then desulfurize it again through the wet desulfurization device 11. The circulating gas prevents the sulfur dioxide that is difficult to remove from entering the atmosphere.

[0088] In some examples, a flue gas desulfurization system further includes a plurality of induced draft fans 15, and the plurality of induced draft fans 15 are respectively arranged between the electrostatic precipitator 10 and the cooling pipe 9 and between the return pipe 13 and the sintering machine 14.

[0089] For example, as Figure 6As shown in the figure, an induced 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 section. During the operation of the electrostatic precipitator 10, the electric field inside it may cause certain changes in the flow rate and pressure of the flue gas. The induced draft fan 15 can adjust the flue gas before it enters the electrostatic precipitator 10 to ensure a stable flow rate and pressure enter the electrostatic precipitator 10. The induced draft fan 15 can prevent the situation where some of the already captured dust is re-entrained 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 collection efficiency. The induced 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 annular cooler 12 can smoothly return to the sintering machine 14. By reasonably adjusting the rotation speed and air volume of the induced draft fan 15, a stable circulation of the flue gas can be achieved, and the recovery rate of waste heat and utilizable components in the flue gas can be increased.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered by the scope of the claims of the present disclosure.

Claims

1. A flue gas desulfurization system, characterized in that, Comprising: A collection cylinder (1), the collection 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 port (104), the inlet (102) being arranged along the tangent of the conical cavity (101), the outlet (103) being several and arranged along the axial direction of the conical cavity (101), the air flow port (104) being several and located on one side of the outlet (103) and arranged along the axial direction of the conical cavity (101); A collection blade group (2), the collection blade group (2) being rotatably arranged in the conical cavity (101), and the rotation axis of the collection blade group (2) being coaxial with the axis of the conical cavity (101); Baffles (4), several baffles (4) being correspondingly arranged on one side of several air flow ports (104), and the baffles (4) being used to block particulate matter from entering the air flow ports (104); 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 baffles (4) being arranged in the spiral guide groove (501) and arranged along the axial direction of the conical cavity (101), the air flow port (104) and the inlet (102) being respectively located on both sides of the baffle (4), and the outlet (103) being located on the side of the baffle (4) close to the inlet (102); The collection blade group (2) includes: A rotating shaft (201), the rotating shaft (201) being rotatably arranged in the conical cavity (101); Collection blades (202), the collection blades (202) being arranged on the rotating shaft (201), several collection blades (202) being arranged circumferentially around the axis of the rotating shaft (201), and there being a gap (203) between the collection blades (202) and the spiral guide plate (5).

2. The flue gas desulfurization system according to claim 1, wherein The flue gas desulfurization system further includes: A dust collection member (6), the outlet (103) leading to the dust collection member (6).

3. A flue gas desulfurization system according to claim 2, characterized in that, An air passage groove (204) is formed between two adjacent collection blades (202), and the air passage groove (204) is inclined upward and towards the spiral guide plate (5).

4. A flue gas desulfurization system according to claim 3, characterized in that, The collection blades (202) have material guide grooves (205), several material guide grooves (205) being provided, and the material guide grooves (205) being configured such that when the collection blades (202) are located on the side of the inlet (102) during the rotation of the collection blade group (2), the material guide grooves (205) face the inlet (102).

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

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

7. A flue gas desulfurization system according to claim 4, characterized in that, The flue gas desulfurization system further includes: A negative pressure fan (7), the material guide groove (205) leads to the negative pressure fan (7); A lifting member (8), the lower end of the lifting member (8) is arranged to be lifted and lowered in the conical cavity (101), the upper end of the lifting member (8) penetrates through the collection cylinder (1) and is located above the collection blades (202), the lifting member (8) has a collision end (804), and after the lifting member (8) descends, the collision end (804) is used to impact the upper end of the collection blade group (2).

8. A flue gas desulfurization system according to claim 7, characterized in that, The lifting member (8) includes: A lifting platform (801), the lower end of the lifting platform (801) is arranged to be lifted and lowered in the conical cavity (101), and the upper end of the lifting platform (801) penetrates through the collection cylinder (1); A rotating member (802), the rotating member (802) is rotatably arranged on the lifting platform (801) and is coaxially arranged 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 circumferential arrangements, the swinging member (803) has the collision end (804), and the collision end (804) is also used to impact the upper end of the spiral guide plate (5).

9. The flue gas desulfurization system according to claim 1, characterized in that, The flue gas desulfurization system further includes: Annular pipes (3), a plurality of annular pipes (3) are arranged along the axis of the conical cavity (101) and are located outside the collection cylinder (1), and the air flow ports (104) lead to the annular pipes (3); Cooling pipes (9), the cooling pipes (9) are spirally arranged on the inner side of the pipe wall of the annular pipes (3); An electrostatic precipitator (10), the annular pipes (3) lead to the electrostatic precipitator (10); A wet desulfurization device (11), the electrostatic precipitator (10) leads to the wet desulfurization device (11); An annular cooler (12), the wet desulfurization device (11) leads to the annular cooler (12); A return pipe (13), the annular cooler (12) leads to the return 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 includes: Drainage fans (15), a plurality of drainage fans (15) are respectively arranged between the electrostatic precipitator (10) and the cooling pipes (9) and between the return pipe (13) and the sintering machine (14).

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