Multi-stage spraying type flue gas desulfurization device

Abstract

The invention discloses a multi-stage spraying type flue gas desulfurization device. The multi-stage spraying type flue gas desulfurization device comprises a desulfurization tower, a conical blanking hopper and a blanking pipe, a containing cavity is formed in the desulfurizing tower, a smoke inlet and a liquid inlet which are communicated with the containing cavity are formed in the desulfurizing tower, and the liquid inlet is formed above the smoke inlet; the conical discharging hopper is arranged at the bottom of the desulfurizing tower, and a discharging cavity communicated with the containing cavity is defined by the conical discharging hopper; the discharging pipe is arranged at the bottom of the conical discharging hopper and communicates with the discharging cavity, the interior of the discharging pipe is divided into a solid discharging channel and a liquid discharging channel, and the solid discharging channel and the liquid discharging channel are used for discharging solid waste and liquid waste in the containing cavity correspondingly. According to the multi-stage spraying type flue gas desulfurization device disclosed by the invention, solid-liquid separation of waste materials can be realized by the multi-stage spraying type flue gas desulfurization device.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization, and in particular to a multi-stage spray type flue gas desulfurization device. Background Art

[0002] In related technologies, nitrogen oxides and sulfur oxides are one of the main sources of air pollution, which have a serious impact on the environment and human health. Therefore, the application of flue gas desulfurization technology is of great significance for purifying ambient air. A flue gas desulfurization device is a device specifically used to remove sulfur dioxide in the flue gas generated by combustion by a certain method. Flue gas desulfurization devices are widely used in industrial fields such as power plants, steel plants, and cement plants to reduce the emission of harmful substances such as sulfur dioxide and protect the atmospheric environment.

[0003] In the existing desulfurization device during the flue gas desulfurization process, it is necessary to make the desulfurization agent fully contact and react with the flue gas through a spraying method. However, the waste liquid generated in this process often entangles solid impurities. For example, a desulfurization tower with a gas-gathering device that can improve the flue gas desulfurization efficiency disclosed in CN217887496U. The bottom surface of the tower body in this patent is designed with a flat bottom structure. When the flue gas enters the gas-gathering cavity of the gas-gathering box and fully contacts the detergent for desulfurization, the waste liquid carries particulate impurities. However, the flat bottom structure design makes it easy for the solid impurities in the waste liquid to concentrate and deposit at the bottom of the tower body. The deposited impurities will not only occupy the bottom space, reduce the effective reaction area, and lower the desulfurization efficiency, but also be unfavorable for the natural discharge of the impurities. External force or equipment is required to clean the deposited impurities, and it does not have a solid-liquid separation function either. This results in a large amount of impurities being carried when the waste liquid is discharged, which will not only cause blockage and wear to the subsequent equipment, increase the failure rate of the equipment, but also require additional equipment and processes to treat the waste liquid carrying a large amount of impurities in the subsequent treatment, further increasing the treatment cost.

[0004] Therefore, it is necessary to invent a multi-stage spray type flue gas desulfurization device and its operation steps to solve the above problems. To solve the problems in the technology that it is not convenient to discharge the waste liquid and does not have a solid-liquid separation function. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a multi-stage spray type flue gas desulfurization device, and the multi-stage spray type flue gas desulfurization device can achieve solid-liquid separation of waste materials.

[0006] According to an embodiment of the present invention, a multi-stage spray-type flue gas desulfurization device comprises: a desulfurization tower, a conical discharge hopper, and a discharge pipe. The desulfurization tower has a storage chamber, and is provided with a smoke inlet and a liquid inlet connected to the storage chamber, wherein the liquid inlet is located above the smoke inlet; the conical discharge hopper is located at the bottom of the desulfurization tower, and defines a discharge chamber connected to the storage chamber; the discharge pipe is located at the bottom of the conical discharge hopper and is connected to the discharge chamber, and the discharge pipe is divided into a solid discharge channel and a liquid discharge channel, wherein the solid discharge channel and the liquid discharge channel are used to discharge solid waste and liquid waste in the storage chamber, respectively.

[0007] According to the multi-stage spray-type flue gas desulfurization device of an embodiment of the present invention, a discharge pipe connected to the accommodating chamber is arranged at the bottom end of the desulfurization tower, and the discharge pipe is divided into a solid discharge channel and a liquid discharge channel. The solid discharge channel and the liquid discharge channel are used to discharge the solid waste and liquid waste in the accommodating chamber respectively, so that the solid waste and liquid waste can be discharged through different pipes respectively, realizing solid-liquid separation, which is conducive to subsequent more refined processing or recycling of solid waste and liquid waste.

[0008] According to some embodiments of the present invention, the multi-stage spray-type flue gas desulfurization device also includes a baffle, a filter and a push plate, the baffle being arranged in the discharge pipe and fixedly connected to the inner wall of the discharge pipe, the baffle being opposite to the solid discharge channel in the up and down directions; the filter screen is movably arranged in the discharge pipe, the baffle and the filter screen are arranged along a first direction, at least part of the filter screen is opposite to the liquid discharge channel in the up and down directions, the filter screen is provided with mesh holes, and when the baffle and the filter screen abut, the ends of the baffle and the filter screen close to each other tilt downward; the push plate is rotatably arranged in the discharge pipe, the push plate is arranged below the filter screen, and the end of the push plate away from its rotation axis abuts the filter screen, the push plate is used to separate or abut the filter screen and the baffle, and the push plate divides the space in the discharge pipe into the solid discharge channel and the liquid discharge channel arranged along the first direction, wherein the first direction is perpendicular to the up and down direction.

[0009] In some embodiments of the present invention, the filter screen is slidably connected to the inner wall of the discharge pipe, and sliders are provided on both side walls of the filter screen along the second direction. The inner walls of both sides of the discharge pipe along the second direction are provided with arc-shaped grooves, and the sliders are slidably provided in the arc-shaped grooves, wherein the first direction and the second direction are perpendicular to the up and down directions.

[0010] In some embodiments of the present invention, there are multiple sliders on each side wall of the filter screen along the second direction, and there are multiple arc-shaped chutes corresponding to the multiple sliders one by one. The arc-shaped chutes are arcs protruding towards the baffle.

[0011] In some embodiments of the present invention, a first spring is provided in the arc-shaped chute. The lower end of the first spring is connected to the upper surface of the slider, and the upper end of the first spring is connected to the inner side wall above the arc-shaped chute, for pushing the filter screen towards the direction close to the push plate.

[0012] In some embodiments of the present invention, the multi-stage spray type flue gas desulfurization device further includes a rotating shaft, a vertical plate and a servo motor. The rotating shaft extends along the second direction; one end of the vertical plate is connected to the outer peripheral wall of the rotating shaft, and the other end is connected to the push plate; the servo motor is connected to the outer wall surface of the feed pipe, and the output shaft of the servo motor is connected to the rotating shaft to drive the push plate to rotate.

[0013] According to some embodiments of the present invention, the multi-stage spray type flue gas desulfurization device further includes a spray mechanism. The spray mechanism is arranged in the accommodation cavity for spraying desulfurization slurry. There are multiple spray mechanisms, and the multiple spray mechanisms are arranged at intervals in the up and down direction.

[0014] In some embodiments of the present invention, the spray mechanism includes a spray layer, nozzles and a packing layer. A spray cavity is provided in the spray layer, and an inlet communicating with the spray cavity is provided on the spray layer; a plurality of nozzles communicating with the spray cavity are arranged on the bottom surface of the spray layer; the packing layer is connected to the top surface of the spray layer for gas-liquid separation.

[0015] In some embodiments of the present invention, the multi-stage spray type flue gas desulfurization device further includes a slurry tank, a pump body and a liquid injection pipe. The slurry tank is used for storing desulfurization slurry; the inlet end of the pump body is connected to the slurry tank; both ends of the liquid injection pipe are respectively connected to the outlet end of the pump body and the spray mechanism.

[0016] According to some embodiments of the present invention, a smoke exhaust port communicating with the accommodation cavity is provided on the desulfurization tower. The smoke exhaust port is arranged at the top of the desulfurization tower. The multi-stage spray type flue gas desulfurization device further includes a fan, a smoke exhaust pipe and a demister. The fan is used to drive the flue gas in the accommodation cavity to be discharged from the smoke exhaust port; both ends of the smoke exhaust pipe are respectively communicated with the smoke exhaust port and the air inlet of the fan; the demister is arranged at the smoke exhaust port and is located between the desulfurization tower and the smoke exhaust pipe for removing fine liquid droplets and fog-like particles carried in the flue gas. The demister is a tube bundle type demister.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic structural diagram of a multi-stage spray flue gas desulfurization device according to an embodiment of the present invention; Figure 2 is a partial schematic structural diagram of a multi-stage spray flue gas desulfurization device according to an embodiment of the present invention, where the desulfurization tower is in cross-section; Figure 3 is a schematic structural diagram of a conical feed hopper and a feed pipe of a multi-stage spray flue gas desulfurization device according to an embodiment of the present invention; Figure 4 is Figure 3 an enlarged view of part A in Figure 5 is a schematic structural diagram of a conical feed hopper and a feed pipe of a multi-stage spray flue gas desulfurization device from another perspective according to an embodiment of the present invention; Figure 6 is a schematic structural diagram of a conical feed hopper and a feed pipe of a multi-stage spray flue gas desulfurization device from yet another perspective according to an embodiment of the present invention; Figure 7 is a schematic structural diagram of a push plate and a vertical plate of a multi-stage spray flue gas desulfurization device according to an embodiment of the present invention; Figure 8 is a schematic structural diagram of a spray mechanism of a multi-stage spray flue gas desulfurization device according to an embodiment of the present invention.

[0019] Reference Signs: 100, multi-stage spray flue gas desulfurization device; 1, bottom plate; 2, desulfurization tower; 201, accommodation cavity; 3, flue gas inlet channel; 4, slurry tank; 5, pump body; 6, liquid injection pipe; 7, spray mechanism; 701, spray layer; 702, nozzle; 703, packing layer; 8, fan; 9, exhaust pipe; 10, conical feed hopper; 1001, feed cavity; 11, feed pipe; 1101, solid feed channel; 1102, liquid feed channel; 12, baffle; 13, filter screen; 14, slider; 15, first spring; 16, arc-shaped chute; 17, servo motor; 18, rotating shaft; 19, vertical plate; 20, push plate; 21, demister. Detailed Embodiments

[0020] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for facilitating the description of the present invention and simplifying the description, 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 thus should not be construed as limiting the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Next, reference is made to Figures 1-8 Describe a multi-stage spray type flue gas desulfurization device 100 according to an embodiment of the present invention.

[0023] As Figure 1 and Figure 2 shown, the multi-stage spray type flue gas desulfurization device 100 according to an embodiment of the present invention includes a desulfurization tower 2, a conical hopper 10, and a feed pipe 11.

[0024] Specifically, as Figures 1-3As shown in the figure, the desulfurization tower 2 has a receiving cavity 201. The desulfurization tower 2 is provided with a flue gas inlet and a liquid inlet that communicate with the receiving cavity 201. The liquid inlet is arranged above the flue gas inlet. A conical discharge hopper 10 is arranged at the bottom of the desulfurization tower 2. The conical discharge hopper 10 defines a discharge cavity 1001 that communicates with the receiving cavity 201. A discharge pipe 11 is arranged at the bottom of the conical discharge hopper 10 and communicates with the discharge cavity 1001. The discharge pipe 11 is divided into a solid discharge channel 1101 and a liquid discharge channel 1102. The solid discharge channel 1101 and the liquid discharge channel 1102 are used to discharge the solid waste and liquid waste in the receiving cavity 201 respectively.

[0025] The multi-stage spray type flue gas desulfurization device 100 is further provided with a bottom plate 1. The desulfurization tower 2 is arranged above the bottom plate 1. An inlet flue gas channel 3 is connected to the outer peripheral wall of the desulfurization tower 2. The inlet flue gas channel 3 communicates with the flue gas inlet. The flue gas to be treated passes through the inlet flue gas channel 3 and is injected into the desulfurization tower 2 through the flue gas inlet. The liquid inlet is used to introduce desulfurization slurry into the receiving cavity 201.

[0026] First, the flue gas to be treated enters the desulfurization tower 2 through the inlet flue gas channel 3. After the flue gas enters the receiving cavity 201, the desulfurization slurry enters the receiving cavity 201 from the liquid inlet. The liquid inlet is arranged above the flue gas inlet. In this way, the flue gas from bottom to top and the desulfurization slurry from top to bottom perform countercurrent contact and mixing, and the desulfurization reaction starts. The sulfur oxides in the flue gas chemically react with the desulfurization slurry to generate products such as sulfates, thereby achieving the desulfurization effect.

[0027] Through the design of the conical discharge hopper 10, the waste can be discharged centrally. The solid waste (such as gypsum) and liquid waste generated during the desulfurization process are respectively concentrated and enter the discharge pipe 11 through the conical discharge hopper 10. The solid waste is discharged through the solid discharge channel 1101, and the liquid waste is discharged through the liquid discharge channel 1102. In this way, solid-liquid separation is achieved.

[0028] The solid discharge channel 1101 is located on one side of the liquid discharge channel 1102. By dividing the discharge pipe 11 into the solid discharge channel 1101 and the liquid discharge channel 1102, the solid waste and the liquid waste can be discharged through different pipes respectively, realizing solid-liquid separation, which helps to perform more refined treatment or recycling of the solid waste and the liquid waste subsequently.

[0029] According to the multi-stage spray-type flue gas desulfurization device 100 of an embodiment of the present invention, a discharge pipe 11 connected to the accommodating chamber 201 is set at the bottom end of the desulfurization tower 2, and the discharge pipe 11 is divided into a solid discharge channel 1101 and a liquid discharge channel 1102. The solid discharge channel 1101 and the liquid discharge channel 1102 are used to discharge the solid waste and liquid waste in the accommodating chamber 201 respectively, so that the solid waste and liquid waste can be discharged through different pipelines respectively, realizing solid-liquid separation, which is conducive to subsequent more refined processing or recovery of solid waste and liquid waste.

[0030] In some embodiments of the present invention, Figure 3 and Figure 5 As shown, the multi-stage spray-type flue gas desulfurization device 100 further includes a baffle 12, a filter screen 13, and a push plate 20. The baffle 12 is disposed within the discharge pipe 11 and fixedly connected to the inner wall of the discharge pipe 11. The baffle 12 is vertically opposed to the solid discharge channel 1101. The filter screen 13 is movably disposed within the discharge pipe 11. The baffle 12 and the filter screen 13 are arranged along a first direction. At least a portion of the filter screen 13 is vertically opposed to the liquid discharge channel 1102. The filter screen 13 has mesh holes. When the baffle 12 and the filter screen 13 abut, the ends of the baffle 12 and the filter screen 13 that are adjacent to each other tilt downward. The push plate 20 is rotatably disposed in the discharge pipe 11. The push plate 20 is disposed below the filter screen 13. The end of the push plate 20 that is away from its rotation axis abuts against the filter screen 13. The push plate 20 is used to separate or abut the filter screen 13 and the baffle 12. The push plate 20 divides the space in the discharge pipe 11 into a solid discharge channel 1101 and a liquid discharge channel 1102 arranged along a first direction, wherein the first direction is perpendicular to the up and down directions.

[0031] A filter screen 13 with an inclined mesh is provided in the discharge pipe 11 to achieve a filtering effect, which helps the fixed waste to be filtered by the filter screen 13 during the flow process. The filter screen 13 intercepts the fine solid particles or impurities carried in the waste, and the liquid waste flows through the mesh on the filter screen 13, thereby achieving solid-liquid separation of the waste, which facilitates subsequent more refined processing or recycling of solid waste and liquid waste.

[0032] The filter screen 13 can be hinged to the inner wall of the blanking pipe 11, so that its position and inclination angle in the blanking pipe 11 can be flexibly adjusted. When the push plate 20 rotates, it can push the filter screen 13 to move, so that the filter screen 13 is separated from or abutted against the baffle 12, enabling the filter screen 13 to switch between the filtering state and the discharging state. When the filter screen 13 is in the filtering state, one end of the filter screen 13 closely adheres to the baffle 12 to intercept solid wastes such as particulate impurities in the waste. At this time, the side of the push plate 20 facing away from the baffle 12 is the liquid blanking channel 1102, and the liquid waste passes through the filter screen 13 under the action of gravity and is discharged from the liquid blanking channel 1102; when the filter screen 13 is in the discharging state, the filter screen 13 is separated from the baffle 12, and the inclined filter screen 13 and the baffle 12 can play a guiding role. At this time, the side of the push plate 20 close to the baffle 12 is the solid blanking channel 1101, and the solid waste is discharged from the solid blanking channel 1101 under the action of gravity. In this way, efficient solid-liquid separation and convenient discharging can be achieved, and the dynamic adjustment mechanism of the filter screen 13 and the push plate 20 realizes the intelligent control of solid-liquid diversion of the waste and discharging.

[0033] Specifically, the waste liquid carrying solid wastes such as particulate impurities is filtered through the filter screen 13 (at this time, one end of the filter screen 13 is in a state of closely adhering to the baffle 12), whereby the filter screen 13 intercepts solid wastes such as fine solid particles or impurities carried in the waste liquid, and the filtered liquid waste is discharged through the liquid blanking channel 1102. When it is necessary to discharge the solid waste on the filter screen 13 and the baffle 12, the push plate 20 rotates, so that the filter screen 13 adjusts its inclination angle, whereby the filter screen 13 is separated from the baffle 12, and a blanking channel is formed between the filter screen 13 and the baffle 12 (at this time, the end of the filter screen 13 closely adhering to the baffle 12 is separated from the baffle 12 and is in an open state), enabling the solid waste to be discharged through the solid blanking channel 1101.

[0034] In some embodiments of the present invention, such as Figure 3 、 Figure 4 and Figure 5 shown, the filter screen 13 is slidably connected to the inner wall of the blanking pipe 11. Sliders 14 are provided on both side walls of the filter screen 13 along the second direction, and arc-shaped chutes 16 are opened on both inner walls of the blanking pipe 11 along the second direction. The sliders 14 are slidably arranged in the arc-shaped chutes 16, wherein the first direction, the second direction and the up-down direction are perpendicular to each other in pairs. The sliders 14 can convert the rotational movement of the filter screen 13 into a sliding movement along the arc-shaped chutes 16, and the inclination angle of the filter screen 13 is precisely controlled by the shape and extension direction of the arc-shaped chutes 16. By providing the sliders 14 and the arc-shaped chutes 16, it is convenient to realize the movement of the filter screen 13 in the blanking pipe 11, and the structure is simple and easy to implement.

[0035] In some embodiments of the present invention, such as Figure 3 、 Figure 4 and Figure 5As shown, there are multiple sliders 14 on each side wall of the filter screen 13 along the second direction, and there are multiple arc-shaped chutes 16 that correspond to the multiple sliders 14 one by one. The arc-shaped chutes 16 are arcs that protrude towards the baffle 12. The inclination angle of the filter screen 13 is precisely controlled by the radian of the arc-shaped chutes 16. The arc-shaped chutes 16 are arcs that protrude towards the baffle 12. When the push plate 20 pushes the filter screen 13, the end of the filter screen 13 close to the baffle 12 can move towards the direction close to the baffle 12, so that the filter screen 13 abuts against the baffle 12, thereby realizing the filtering function and discharging the liquid waste. When it is necessary to separate the baffle 12 from the filter screen 13, the baffle 12 is made to face the opposite direction, that is, the end of the filter screen 13 close to the baffle 12 can move towards the direction away from the baffle 12, thereby discharging the solid waste.

[0036] Setting the sliders 14 and the arc-shaped chutes 16 to be multiple corresponding ones can ensure the stability of the sliding connection between the filter screen 13 and the inner wall of the blanking pipe 11. As Figure 5 shown in the example, there are 4 corresponding sliders 14 and arc-shaped chutes 16. Of course, the sliders 14 and the arc-shaped chutes 16 can also be 2, 3, 5, 6, and so on.

[0037] In some embodiments of the present invention, as Figure 4 shown, a first spring 15 is provided in the arc-shaped chute 16. The lower end of the first spring 15 is connected to the upper surface of the slider 14, and the upper end of the first spring 15 is connected to the inner side wall above the arc-shaped chute 16, and is used to push the filter screen 13 towards the direction close to the push plate 20. When it is necessary to discharge the solid waste, the push plate 20 rotates, and the first spring 15 pushes the filter screen 13 towards the direction close to the push plate 20. The end of the filter screen 13 close to the baffle 12 can move towards the direction away from the baffle 12, so that the baffle 12 is separated from the filter screen 13, thereby discharging the solid waste. During the movement of the filter screen 13, the vibration effect of the first spring 15 can also assist in shaking off the solid particles adhering to the filter screen 13.

[0038] The cooperation of the slider 14, the arc-shaped chute 16 and the first spring 15 enables the filter screen 13 to flexibly adjust the inclination angle when the push plate 20 rotates, realizing the switching between the filtering and discharging functions. When the push plate 20 pushes the filter screen 13 so that the filter screen 13 is close to the baffle 12, the filtering function can be realized to discharge the liquid waste; when the push plate 20 rotates in the opposite direction, the first spring 15 pushes the filter screen 13 to separate from the baffle 12, thereby discharging the solid waste.

[0039] In some embodiments of the present invention, as Figure 3 、 Figure 6 and Figure 7As shown, the multi-stage spray type flue gas desulfurization device 100 further includes a rotating shaft 18, a vertical plate 19 and a servo motor 17. The rotating shaft 18 extends along the second direction. One end of the vertical plate 19 is connected to the outer peripheral wall of the rotating shaft 18, and the other end is connected to the push plate 20; the servo motor 17 is connected to the outer wall surface of the feeding pipe 11, and the output shaft of the servo motor 17 is connected to the rotating shaft 18 to drive the push plate 20 to rotate.

[0040] The servo motor 17 is fixed at the middle position of the rear wall of the feeding pipe 11. The output end of the servo motor 17 penetrates the wall of the feeding pipe 11 and is connected to the rotating shaft 18. Driven by the servo motor 17, the rotating shaft 18 can drive the vertical plate 19 to rotate in the feeding pipe 11, thereby driving the push plate 20 to rotate to push the filter screen 13. The structure is simple and the transmission relationship is stable.

[0041] The vertical plate 19 and the push plate 20 are fixedly connected. As the terminal force-bearing component for the servo motor 17 to drive the rotating shaft 18, the vertical plate 19 needs to have high strength to withstand the torque and vibration of the servo motor 17. The vertical plate 19 is fixedly connected to the rotating shaft 18 to provide a rigid support foundation for the push plate 20.

[0042] In some embodiments of the present invention, as Figure 2 and Figure 8 shown, the multi-stage spray type flue gas desulfurization device 100 further includes a spray mechanism 7. The spray mechanism 7 is arranged in the accommodation cavity 201 for spraying desulfurization slurry. There are multiple spray mechanisms 7, and the multiple spray mechanisms 7 are arranged at intervals in the up and down direction.

[0043] The flue gas to be treated enters the desulfurization tower 2 through the flue gas inlet passage 3. After the flue gas enters the accommodation cavity 201, the desulfurization slurry is sprayed into the accommodation cavity 201 from the liquid inlet through the spray mechanism 7. In this way, the flue gas from bottom to top and the desulfurization slurry from top to bottom are in countercurrent contact and mixing, and the desulfurization reaction starts. The sulfur oxides in the flue gas react chemically with the desulfurization slurry to generate products such as sulfates, thereby achieving the desulfurization effect.

[0044] Setting multiple spray mechanisms 7 inside the desulfurization tower 2 can significantly increase the contact area and time between the flue gas and the desulfurization slurry, ensure that the desulfurization slurry fully covers the flue gas, enable the sulfur oxides in the flue gas to react more fully with the slurry, realize the deep removal of sulfur oxides in the flue gas, and effectively improve the desulfurization effect and desulfurization efficiency.

[0045] As Figure 2 shown, three spray mechanisms 7 are arranged in the accommodation cavity 201. Of course, the number of spray mechanisms 7 can also be 2, 4, 5, 6, etc.

[0046] In some embodiments of the present invention, as Figure 2 and Figure 8As shown, the spraying mechanism 7 includes a spraying layer 701, nozzles 702 and a packing layer 703. The spraying layer 701 is provided with a spraying cavity. The spraying layer 701 is provided with an inlet communicating with the spraying cavity. The bottom surface of the spraying layer 701 is provided with a plurality of nozzles 702 communicating with the spraying cavity. The packing layer 703 is connected to the top surface of the spraying layer 701 and is used for gas-liquid separation.

[0047] The desulfurization slurry is sprayed into a mist through the nozzles 702 and makes countercurrent contact with the flue gas entering the accommodation cavity 201 from bottom to top. The design of the nozzles 702 enables the desulfurization slurry to be evenly sprayed on the flue gas, increasing the contact area.

[0048] The packing layer 703 helps with gas-liquid separation, reduces the water vapor and fine droplet content in the flue gas, and improves the purification effect of the flue gas. Through the synergistic effect of spraying by the nozzles and the packing layer 703, deep removal of sulfur oxides in the flue gas is achieved, effectively improving the desulfurization effect and performance.

[0049] In some embodiments of the present invention, as Figure 1 shown, the multi-stage spray type flue gas desulfurization device 100 further includes a slurry tank 4, a pump body 5 and a liquid injection pipe 6. The slurry tank 4 is used for storing the desulfurization slurry. The liquid inlet end of the pump body 5 is connected to the slurry tank 4. The two ends of the liquid injection pipe 6 are respectively connected to the liquid outlet end of the pump body 5 and the spraying mechanism 7. The slurry tank 4 is arranged on one side of the desulfurization tower 2, and the pump body 5 is arranged on the front side of the slurry tank 4. The pump body 5 is responsible for pumping the desulfurization slurry out of the slurry tank 4 and transporting it to the spraying mechanism 7 through the liquid injection pipe 6 to ensure the transportation of the desulfurization slurry.

[0050] In some embodiments of the present invention, as Figure 1 shown, the desulfurization tower 2 is provided with a smoke exhaust port communicating with the accommodation cavity 201. The smoke exhaust port is arranged at the top of the desulfurization tower 2. The multi-stage spray type flue gas desulfurization device 100 further includes a fan 8, a smoke exhaust pipe 9 and a demister 21. The fan 8 is used to drive the flue gas in the accommodation cavity 201 to be discharged from the smoke exhaust port; the two ends of the smoke exhaust pipe 9 are respectively connected to the smoke exhaust port and the air inlet of the fan 8; the demister 21 is arranged at the smoke exhaust port and is located between the desulfurization tower 2 and the smoke exhaust pipe 9 and is used for removing the fine droplets and mist particles carried in the flue gas. The demister 21 is a tube bundle type demister 21. The demister 21 can further remove the fine droplets and mist particles carried in the flue gas and improve the emission quality of the flue gas.

[0051] The blower 8 is connected to the desulfurization tower 2 through the smoke exhaust pipe 9, which can form a negative pressure, so as to more effectively extract the desulfurized flue gas from the desulfurization tower 2 and discharge it into the atmosphere. The treated flue gas enters the demister 21 through the blower 8 to further remove the fine droplets and fog-like particles carried in the flue gas. The flue gas treated by the demister 21 finally discharges from the desulfurization tower 2 through the smoke exhaust pipe 9. The installed demister 21 further removes the fine droplets and fog-like particles carried in the flue gas, making the discharged flue gas cleaner and meeting the environmental protection requirements. The following describes the operation steps of the multi-stage spray type flue gas desulfurization, including the following steps: Step 1: Inject the flue gas to be treated into the desulfurization tower 2 through the smoke inlet passage 3. Then, through the pump body 5, the desulfurization slurry in the slurry tank 4 is transported to the spraying mechanism 7 through the liquid injection pipe 6. Step 2: The desulfurization slurry is sprayed into a mist shape through the nozzles 702 of the spraying mechanism 7 and contacts the flue gas entering the desulfurization tower 2 from bottom to top in a countercurrent manner. The flue gas will sequentially pass through these three layers of spraying mechanisms 7 during the rising process. The flue gas treated by the three layers of spraying mechanisms 7 continues to rise and passes through the packing layer 703 for gas-liquid separation to remove the water vapor and fine droplets in the flue gas. Step 3: The treated flue gas enters the demister 21 through the blower 8 to further remove the fine droplets and fog-like particles carried in the flue gas. The flue gas treated by the demister 21 finally discharges from the desulfurization tower 2 through the smoke exhaust pipe 9. Step 4: The solid waste and liquid waste generated during the desulfurization process are respectively concentrated and enter the blanking pipe 11 through the conical blanking hopper 10. The filter screen 13 inside the blanking pipe 11 can achieve solid-liquid separation. The solid waste is discharged through the solid blanking channel 1101, and the liquid waste is discharged through the liquid blanking channel 1102.

[0052] The following describes a specific embodiment of the present invention.

[0053] Refer to Figures 1-8 , first, the flue gas to be treated enters the desulfurization tower 2 through the smoke inlet passage 3. After the flue gas enters the desulfurization tower 2, the pump body 5 transports the desulfurization slurry in the slurry tank 4 to the spraying mechanism 7 through the liquid injection pipe 6. Multiple nozzles 702 evenly spray the slurry on the flue gas and perform preliminary mixing with the desulfurization slurry sprayed from the spraying mechanism 7, starting the desulfurization reaction. The sulfur oxides in the flue gas react chemically with the desulfurization slurry to generate products such as sulfates, thereby achieving desulfurization. The desulfurized flue gas passes through the packing layer 703, which helps with gas-liquid separation, reduces the content of water vapor and fine droplets in the flue gas, and improves the purification effect of the flue gas. The flue gas in the desulfurization tower 2 passing through the three layers of spraying mechanisms 7 effectively improves the desulfurization effect.

[0054] After the desulfurization reaction, the liquid carrying particulate impurities uniformly fall into the conical hopper 10. However, the waste liquid carrying particulate impurities will be filtered through the filter screen 13 (at this time, one end of the filter screen 13 is in close contact with the baffle 12). Thus, the filter screen 13 intercepts the fine solid particles or impurities that may be carried, and the filtered wastewater will be discharged through the liquid discharge channel 1102. When it is necessary to discharge the solid particles on the filter screen 13, the servo motor 17 is started. The servo motor 17 drives the rotating shaft 18 and the vertical plate 19 to rotate, and then drives the push plate 20 to rotate synchronously. The push plate 20 rotates towards the end of the filter screen 13 hinged to the wall surface of the desulfurization tower 2, pushing the filter screen 13 to adjust the inclination angle. Thus, the filter screen 13 returns to its original state, causing the filter screen 13 to separate from the baffle 12 to form a discharge pipe 11 (at this time, the end of the filter screen 13 in close contact with the baffle 12 is separated from the baffle 12 and is in an open state), enabling the solid waste particles to be discharged through the solid discharge channel 1101. Finally, the desulfurized flue gas is discharged through the exhaust pipe 9, and the flue gas discharged from the exhaust pipe 9 is further passed through the demister 21 to remove the fine liquid droplets and fog-like particles carried in the flue gas, and is finally discharged into the atmosphere through the fan 8.

[0055] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-stage spray type flue gas desulfurization device, characterized in that, include: A desulfurization tower, wherein the desulfurization tower has a receiving cavity, and the desulfurization tower is provided with a smoke inlet and a liquid inlet communicated with the receiving cavity, wherein the liquid inlet is arranged above the smoke inlet; A conical lower hopper, the conical lower hopper being arranged at the bottom of the desulfurization tower, the conical lower hopper defining a lowering cavity communicating with the accommodating cavity; A discharge pipe is provided at the bottom of the conical discharge hopper and is connected to the discharge cavity. The discharge pipe is divided into a solid discharge channel and a liquid discharge channel. The solid discharge channel and the liquid discharge channel are used to discharge the solid waste and liquid waste in the accommodating cavity respectively.

2. The multi-stage spray type flue gas desulfurization device according to claim 1, wherein Also includes: a baffle, the baffle being disposed in the discharge pipe and fixedly connected to the inner wall of the discharge pipe, the baffle being opposite to the solid discharge channel in the up and down directions; a filter screen movably disposed in the discharge pipe, the baffle and the filter screen being arranged along a first direction, at least a portion of the filter screen being opposed to the liquid discharge channel in the vertical direction, the filter screen being provided with mesh holes, and when the baffle and the filter screen abut against each other, the ends of the baffle and the filter screen that are close to each other tilt downward; A push plate, the push plate is rotatably disposed in the discharge pipe, the push plate is disposed below the filter screen, the end of the push plate facing away from its rotation axis abuts against the filter screen, the push plate is used to separate or abut the filter screen and the baffle, the push plate divides the space in the discharge pipe into the solid discharge channel and the liquid discharge channel arranged along the first direction, wherein the first direction is perpendicular to the up and down directions.

3. The multi-stage spray type flue gas desulfurization device according to claim 2, wherein, The filter is slidably connected to the inner wall of the discharge pipe, and sliders are provided on both side walls of the filter along the second direction. The inner walls of both sides of the discharge pipe along the second direction are provided with arc-shaped grooves, and the sliders are slidably provided in the arc-shaped grooves, wherein the first direction and the second direction are perpendicular to the up and down directions.

4. The multi-stage spray type flue gas desulfurization device according to claim 3, wherein, There are multiple sliders on each side wall of the filter along the second direction, and there are multiple arc-shaped sliding grooves corresponding to the multiple sliders one by one. The arc-shaped sliding grooves are arc-shaped and protrude toward the baffle.

5. The multi-stage spray type flue gas desulfurization device according to claim 3, characterized in that, A No. 1 spring is provided in the arc-shaped slide groove, the lower end of the No. 1 spring is connected to the upper surface of the slider, and the upper end of the No. 1 spring is connected to the inner wall above the arc-shaped slide groove, which is used to push the filter toward the direction close to the push plate.

6. The multi-stage spray type flue gas desulfurization device according to claim 2, wherein Also includes: a rotating shaft extending along a second direction; a vertical plate, one end of which is connected to the outer peripheral wall of the rotating shaft, and the other end of which is connected to the push plate; A servo motor is connected to the outer wall of the feeding tube, and an output shaft of the servo motor is connected to the rotating shaft to drive the push plate to rotate.

7. The multi-stage spray type flue gas desulfurization device according to claim 1, wherein, Also includes: A spraying mechanism is provided in the accommodating chamber and is used for spraying the desulfurization slurry. There are multiple spraying mechanisms, and the multiple spraying mechanisms are spaced apart in the up and down directions.

8. The multi-stage spray type flue gas desulfurization device according to claim 7, characterized in that, The spray mechanism comprises: A spray layer, wherein a spray cavity is provided in the spray layer, and an inlet is provided on the spray layer and communicated with the spray cavity; Nozzles, a plurality of nozzles communicating with the spray chamber are provided on the bottom surface of the spray layer; Packing layer, the packing layer is connected to the top surface of the spray layer for gas-liquid separation.

9. The multi-stage spray type flue gas desulfurization device according to claim 7, wherein, It further includes: Slurry tank for storing desulfurization slurry; Pump body, the liquid inlet end of the pump body is connected to the slurry tank; Liquid injection pipe, both ends of the liquid injection pipe are respectively connected to the liquid outlet end of the pump body and the spray mechanism.

10. The multi-stage spray type flue gas desulfurization device according to claim 1, characterized in that, A smoke exhaust port communicating with the accommodation chamber is provided on the desulfurization tower, the smoke exhaust port is provided at the top of the desulfurization tower, and the multi-stage spray type flue gas desulfurization device further includes: Fan for driving the flue gas in the accommodation chamber to be discharged from the smoke exhaust port; Smoke exhaust pipe, both ends of the smoke exhaust pipe are respectively communicated with the smoke exhaust port and the air inlet of the fan; Demister, the demister is provided at the smoke exhaust port and is located between the desulfurization tower and the smoke exhaust pipe for removing fine liquid droplets and fog-like particles carried in the flue gas, and the demister is a tube bundle type demister.

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