Prebaked anode calcination flue gas desulfurization device and desulfurization method

Abstract

The invention relates to the technical field of flue gas desulfurization, one embodiment of the invention provides a prebaked anode calcination flue gas desulfurization device and method.The prebaked anode calcination flue gas desulfurization device comprises a tower body, a main pipeline and a spray head, the tower body is provided with a flue gas inlet and a flue gas outlet, the main pipeline is arranged in the tower body, and the spray head is arranged in the tower body; the main pipeline is used for being communicated with a desulfurization liquid supply unit, a water outlet hole is formed in the main pipeline, the top end of the spray head is spherically hinged into the water outlet hole and communicated with the water outlet hole, the spray head is used for making the bottom end of the spray head do circular motion around the axis of the water outlet hole, and the bottom end of the spray head is a water outlet end. By means of the technical scheme, the technical problems that in the prior art, the contact direction of slurry and flue gas is single, contact is insufficient, and the desulfurization efficiency is low are solved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of flue gas desulfurization, and in particular, to a prebaked anode calcined flue gas desulfurization device and a desulfurization method. Background Art

[0002] In modern industrial production, prebaked anodes are key raw materials for aluminum electrolysis production, and environmental issues in their production process have attracted much attention. The calcination process of prebaked anodes will produce a large amount of flue gas containing pollutants such as sulfur dioxide, which will cause serious harm to the environment if it is not effectively treated and discharged directly.

[0003] At present, limestone gypsum spray flue gas desulfurization is a commonly used desulfurization technology. Its basic principle is that the flue gas contacts the slurry, the sulfur dioxide in the flue gas first dissolves in the water, transfers from the gas phase to the liquid phase, and then contacts the slurry more fully, and then reacts well with the calcium hydroxide and other components in the lime slurry, and finally achieves the purpose of desulfurization.

[0004] However, in the prior art, the lime slurry is sprayed downwards and countercurrently contacts with the upward flue gas, absorbing sulfur dioxide through chemical reactions to generate gypsum, which can also be used as a by-product in the field of building materials. The countercurrent contact direction of the slurry and the flue gas is single, and the contact is not sufficient, which affects the adequacy of the reaction and the desulfurization efficiency.

[0005] In summary, the existing prebaked anode calcined flue gas desulfurization method has the problems of single contact direction between slurry and flue gas, insufficient contact and low desulfurization efficiency. It is urgent to develop a new prebaked anode calcined flue gas desulfurization device to solve these problems. Summary of the invention

[0006] To overcome the above defects, the embodiments of the present disclosure provide a prebaked anode calcined flue gas desulfurization device and a desulfurization method, which solve the technical problems in the related art that the slurry and flue gas contact in a single direction, the contact is not sufficient, and the desulfurization efficiency is low.

[0007] According to one aspect, at least one embodiment of the present disclosure provides a prebaked anode calcining flue gas desulfurization device, comprising a tower body, a main pipeline and a nozzle, the tower body having a flue gas inlet and a flue gas outlet, the main pipeline penetrating the tower body and extending into the tower body, the main pipeline being used to connect to a desulfurization liquid supply unit and transport desulfurization liquid into the tower body, the main pipeline having a water outlet, the top ball of the nozzle being hinged in the water outlet and connected to the water outlet, the nozzle being able to make circular motion around the axis of the water outlet, and the bottom end of the nozzle being a water outlet end.

[0008] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: A rotating frame body is arranged inside the tower body and moves along a circular trajectory. The rotating frame body is eccentrically arranged relative to the axis of the tower body. The rotating frame body has a mounting hole for the nozzle to pass through. The middle ball of the nozzle is hinged in the mounting hole. The rotating frame body is used to drive the bottom end of the nozzle to perform circular motion around the axis of the water outlet.

[0009] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: A bracket and a crank member, wherein the bracket is arranged in the tower body, two ends of the crank member are respectively hinged to the bracket and the rotating frame body, and the crank member is used to drive the rotating frame body to move.

[0010] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: Driving motor, first bevel gear and second bevel gear The driving motor is connected to the outer wall of the tower body, the first bevel gear and the second bevel gear are both rotatably arranged in the tower body, the first bevel gear is meshed with the second bevel gear, the driving motor is drivingly connected to the first bevel gear to drive the first bevel gear to rotate, and the second bevel gear is drivingly connected to the crank member to drive the crank member to rotate.

[0011] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: A pretreatment box and a partition, wherein the pretreatment box is arranged in the tower body and below the nozzle, the smoke inlet is connected to the pretreatment box, the partition is arranged on the top of the pretreatment box, a smoke outlet is provided between the partition and the pretreatment box, the smoke outlet is connected to the tower body, and there is a gap between the outer periphery of the pretreatment box and the inner wall of the tower body.

[0012] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: A humidification pool, a humidification tube and a pump body, wherein the humidification pool is arranged in the pretreatment box, the humidification pool is filled with humidification liquid, the humidification tube is arranged in the humidification pool, the lower end of the humidification tube is connected with the humidification pool, the top of the humidification tube has a liquid outlet, the liquid outlet is used for the humidification liquid to flow out, and a water curtain for humidifying flue gas is formed on the periphery of the humidification tube, the pump body is arranged in the humidification tube, and is used to continuously pump the humidification liquid in the humidification pool into the humidification tube.

[0013] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: The liquid outlet hole is arranged obliquely, and the height of the liquid outlet hole gradually decreases in the direction away from the center of the humidification tube. The diameter of the partition is smaller than the diameter of the top of the pretreatment box.

[0014] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: The outer wall of the humidification tube is an inclined surface, a curved surface or a stepped surface.

[0015] For example, at least one embodiment of the present disclosure provides a prebaked anode calcined flue gas desulfurization device, further comprising: A heat exchange coil and a water tank, wherein the heat exchange coil is arranged in the pretreatment box and is arranged outside the humidification tube. The heat exchange coil is spiral-shaped. The water tank is used to be arranged beside the tower body. Both ends of the heat exchange coil are used to connect to the water tank.

[0016] Another embodiment of the present disclosure provides a method for desulfurizing flue gas by calcining a prebaked anode, using a flue gas desulfurization device by calcining a prebaked anode, comprising the following steps: S1 Flue gas pretreatment: The high-temperature flue gas first enters the pretreatment box through the flue gas inlet, and contacts the water curtain formed by the outer wall of the humidification tube, causing water evaporation, and humidifying the high-temperature flue gas; S2 Flue gas waste heat recovery: Circulating water is passed through the heat exchange coil, and both ends are connected to the water source. The high-temperature flue gas is fully in contact with the outer wall of the heat exchange coil in the pretreatment box to perform efficient waste heat recovery; S3 spraying high-efficiency desulfurization: The flue gas discharged from the pretreatment box is fully in contact with the desulfurization liquid sprayed by the nozzle. The bottom of the nozzle makes a circular motion, so that the desulfurization liquid constantly changes the angle of contact with the flue gas, and performs high-efficiency desulfurization.

[0017] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, the water outlet end of the nozzle performs a circular motion around the axis of the water outlet hole, so that the slurry can contact the flue gas from multiple different angles, which changes the situation in the prior art where the slurry and the flue gas have a single countercurrent contact direction. This multi-angle contact method increases the contact area and contact time between the slurry and the flue gas, allowing sulfur dioxide to have more opportunities to dissolve in the slurry and react with components such as calcium hydroxide, thereby significantly improving the adequacy of the reaction. Compared with traditional desulfurization devices, the desulfurization device of the present invention can process more sulfur dioxide in the same time, or when processing the same amount of sulfur dioxide, it can achieve a higher desulfurization accuracy, effectively improving the desulfurization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the appearance of a prebaked anode calcining flue gas desulfurization device in one embodiment of the present disclosure; Figure 2 for Figure 1 A schematic diagram of the internal structure of a prebaked anode calcining flue gas desulfurization device in an embodiment; Figure 3 for Figure 2 An enlarged view of position B in the embodiment of the present invention; Figure 4 for Figure 1 A schematic structural diagram of a rotating frame body in an embodiment of the present invention; Figure 5 for Figure 1 A schematic diagram of the eccentric structure between the rotating frame and the main pipeline in the embodiment; Figure 6 for Figure 2 An enlarged view of point A in the embodiment of the present invention.

[0020] In the figure: 1, tower body, 2, main pipeline, 3, nozzle, 4, flue gas inlet, 5, flue gas outlet, 6, water outlet, 7, rotating frame, 8, mounting hole, 9, bracket, 10, crank member, 11, pretreatment box, 12, partition, 13, smoke outlet, 14, humidification tank, 15, humidification tube, 16, pump body, 17, liquid outlet, 18, heat exchange coil, 19, drive motor, 20, first bevel gear, 21, second bevel gear. DETAILED DESCRIPTION

[0021] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0022] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0023] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0024] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0026] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] like Figure 1 to Figure 6 As shown, it shows a prebaked anode calcining flue gas desulfurization device in an embodiment of the present disclosure, including a tower body 1, a main pipeline 2 and a nozzle 3, the tower body 1 is provided with a flue gas inlet 4 and a flue gas outlet 5, the main pipeline 2 penetrates the tower body 1 and extends into the tower body 1, the main pipeline 2 is used to connect the desulfurization liquid supply unit and transport the desulfurization liquid into the tower body 1, the main pipeline 2 is provided with a water outlet 6, the top ball of the nozzle 3 is hinged in the water outlet 6 and is connected to the water outlet 6, the nozzle 3 can make a circular motion around the axis of the water outlet 6, and the bottom end of the nozzle 3 is the water outlet end.

[0028] For example, Figure 2-Figure 5As shown, the flue gas containing sulfur dioxide generated by the calcination of the prebaked anode enters the tower body 1 through the flue gas inlet 4 of the tower body 1. At the same time, the desulfurization liquid supply unit transports the lime slurry to the inside of the tower body 1 through the main pipeline 2. Since the top ball of the nozzle 3 is hinged in the water outlet 6 of the main pipeline 2 and is connected to the water outlet 6, the slurry is sprayed out from the water outlet end at the bottom of the nozzle 3 under the action of the slurry pressure.

[0029] Then the water outlet at the bottom of the nozzle 3 starts to make a circular motion around the axis of the water outlet hole 6. During the motion, the lime slurry sprayed from the water outlet of the nozzle 3 contacts the flue gas flowing from bottom to top at a constantly changing angle. As the nozzle 3 continues to make a circular motion, the slurry forms a relatively three-dimensional spray area in the tower body 1, covering the flow path of the flue gas in all directions. In this process, the sulfur dioxide in the flue gas first dissolves in the water contained in the sprayed slurry, transfers from the gas phase to the liquid phase, and then the sulfur dioxide reacts chemically with the calcium hydroxide and other components in the slurry. The gypsum generated by the reaction will fall to the bottom of the tower body 1 with the slurry, and can be collected by relevant equipment as a by-product for use in the field of building materials.

[0030] The water outlet end of the nozzle 3 performs a circular motion around the axis of the water outlet hole 6, so that the slurry can contact the flue gas from multiple different angles, which changes the situation in the prior art that the slurry and the flue gas have a single countercurrent contact direction. This multi-angle contact method increases the contact area and contact time between the slurry and the flue gas, allowing sulfur dioxide to have more opportunities to dissolve in the slurry and react with components such as calcium hydroxide, thereby significantly improving the sufficiency of the reaction. Compared with traditional desulfurization devices, the desulfurization device of the present invention can process more sulfur dioxide in the same time, or when processing the same amount of sulfur dioxide, it can achieve a higher desulfurization accuracy, effectively improving the desulfurization efficiency.

[0031] In some examples, a rotating frame body 7 is further included, and the rotating frame body 7 is arranged in the tower body 1 and moves along a circular trajectory. The rotating frame body 7 is eccentrically arranged relative to the axis of the tower body 1, and has a mounting hole 8 for the nozzle 3 to pass through. The middle ball of the nozzle 3 is hinged in the mounting hole 8, and the rotating frame body 7 is used to drive the bottom end of the nozzle 3 to perform circular motion around the axis of the water outlet 6.

[0032] For example, Figure 2-Figure 5 As shown, after the prebaked anode calcining flue gas enters the tower body 1 from the flue gas inlet 4, the rotating frame 7 starts to operate. Since the middle ball of the nozzle 3 is hinged in the mounting hole 8 of the rotating frame 7, the rotation of the rotating frame 7 will drive the nozzle 3 to twist. Driven by the rotating frame 7, the water outlet end at the bottom of the nozzle 3 moves along a circular trajectory.

[0033] The main pipeline 2 transports the lime slurry provided by the desulfurization liquid supply unit to the nozzle 3. The slurry sprayed from the water outlet of the nozzle 3 changes its spraying angle continuously as the angle of the nozzle 3 is continuously adjusted. In this process, the slurry sprayed at different angles fully contacts the rising flue gas, and the sulfur dioxide in the flue gas quickly dissolves in the slurry and fully reacts with the calcium hydroxide and other components in the slurry. The gypsum generated by the reaction settles to the bottom of the tower body 1 and is collected and processed by subsequent equipment.

[0034] The middle part of the nozzle 3 is ball-jointed with the rotating frame 7, and the rotating frame 7 can drive the nozzle 3 to twist, so that the spraying angle changes continuously, forming a more complex and comprehensive spraying coverage area in the tower body 1. The slurry is fully in contact with the flue gas at different positions in the tower body 1, further increasing the gas-liquid contact area and improving the sufficiency of the desulfurization reaction. The multi-angle and all-round spraying method makes the reaction between sulfur dioxide and slurry more sufficient and efficient, thereby significantly improving the desulfurization efficiency.

[0035] In some examples, a bracket 9 and a crank member 10 are further included. The bracket 9 is disposed in the tower body 1 , and two ends of the crank member 10 are respectively hinged to the bracket 9 and the rotating frame body 7 , and the crank member 10 is used to drive the rotating frame body 7 to move.

[0036] For example, Figure 2-Figure 5 As shown, the bracket 9 is installed at a predetermined position on the inner wall of the tower body 1 to provide a support foundation for the transmission structure. One end of the crank member 10 is hinged to the bracket 9, and the other end is hinged to the rotating frame 7. When the desulfurization device starts to operate, the driving source (such as a motor, etc.) provides power to the crank member 10 to start rotating.

[0037] As the crank member 10 rotates, due to the hinged structure at both ends, the crank member 10 transmits the rotational force to the rotating frame 7. This allows the rotating frame 7 to rotate around the axis of the tower body 1. Because the middle ball of the spray head 3 is hinged in the mounting hole 8 of the rotating frame 7, the rotation of the rotating frame 7 drives the spray head 3 to twist, and the water outlet at the bottom of the spray head 3 moves along a circular trajectory, achieving multi-angle spraying.

[0038] A stable transmission structure is constructed by the cooperation of the bracket 9 and the crank member 10. The hinged design at both ends of the crank member 10 ensures stable power transmission, ensuring that the rotating frame 7 can rotate continuously and stably, thereby ensuring that the nozzle 3 can adjust the angle and spray according to the predetermined trajectory, providing a solid guarantee for the stable operation of the desulfurization device.

[0039] In some examples, it also includes a drive motor 19, a first bevel gear 20 and a second bevel gear 21, the drive motor 19 is connected to the outer wall of the tower body 1, the first bevel gear 20 and the second bevel gear 21 are both rotatably arranged in the tower body 1, the first bevel gear 20 is meshed with the second bevel gear 21, the drive motor 19 is drivingly connected to the first bevel gear 20 to drive the first bevel gear 20 to rotate, and the second bevel gear 21 is drivingly connected to the crank member 10 to drive the crank member 10 to rotate.

[0040] For example, Figure 2 As shown, when the desulfurization device is started, the drive motor 19 is powered on and operates. The motor is located on the outer wall of the tower body 1, and its power output shaft is connected to the first bevel gear 20 in the tower body 1, driving the first bevel gear 20 to start rotating. Since the first bevel gear 20 and the second bevel gear 21 are meshed with each other, the rotation of the first bevel gear 20 is transmitted to the second bevel gear 21, so that they rotate synchronously. The second bevel gear 21 is coaxially provided with a pulley, and the hinged end of the crank member 10 is also coaxially provided with a pulley. The two pulleys are sleeved with a transmission belt, so that the second bevel gear 21 drives the crank member 10 to rotate around the hinge point. The rotation of the crank member 10 drives the rotating frame 7 hinged thereto to rotate around the axis of the tower body 1, and finally realizes the multi-angle spraying effect of the nozzle 3. The pulley and the transmission belt can also be replaced by a sprocket and a chain.

[0041] In some examples, a pretreatment box 11 and a partition 12 are further included. The pretreatment box 11 is arranged in the tower body 1 and below the nozzle 3. The flue gas inlet 4 is connected to the pretreatment box 11. The partition 12 is arranged on the top of the pretreatment box 11. A smoke outlet 13 is provided between the partition 12 and the pretreatment box 11. The smoke outlet 13 is connected to the tower body 1. There is a gap between the outer periphery of the pretreatment box 11 and the inner wall of the tower body 1.

[0042] For example, Figure 6 As shown, the flue gas enters the pretreatment box 11 from the flue gas inlet 4. Various pretreatment components can be set in the pretreatment box 11, such as a heat exchange component. When the flue gas flows in the pretreatment box 11, it exchanges heat with the heat exchange component to achieve waste heat recovery. The recovered heat can be used to preheat the desulfurization liquid or other links that require thermal energy. For example, a filter component is set to filter impurities in the flue gas.

[0043] The pretreated flue gas enters the main spray reaction area of ​​the tower body 1 through the smoke port 13 between the partition 12 and the pretreatment box 11, and the sprinkler 3 continuously sprays lime slurry. The slurry fully contacts the rising flue gas to carry out the desulfurization reaction. The reacted slurry will fall on the partition 12, and then flow to the bottom of the tower body 1 along the gap between the pretreatment box 11 and the inner wall of the tower body 1. At the bottom of the tower body 1, the collected slurry can be subsequently processed.

[0044] By arranging the pretreatment box 11 in the tower body 1, various pretreatment components can be arranged as needed, so as to perform various pretreatments on the flue gas, thereby improving the flexibility of flue gas treatment. Integrating the flue gas pretreatment function inside the tower body 1 simplifies the structure of the entire desulfurization system, reduces the equipment footprint and construction cost, and improves the functional integration of the device.

[0045] In some examples, it also includes a humidification pool 14, a humidification tube 15 and a pump body 16. The humidification pool 14 is arranged in the pretreatment box 11. The humidification pool 14 is filled with humidification liquid. The humidification tube 15 is arranged in the humidification pool 14. The lower end of the humidification tube 15 is connected to the humidification pool 14. The top of the humidification tube 15 has a liquid outlet 17. The liquid outlet 17 is used for the humidification liquid to flow out and form a water curtain for humidifying the flue gas on the periphery of the humidification tube 15. The pump body 16 is arranged in the humidification tube 15, and is used to continuously pump the humidification liquid in the humidification pool 14 into the humidification tube 15.

[0046] For example, Figure 6 As shown, the basic principle of the limestone gypsum spray flue gas desulfurization method is that the sulfur dioxide in the flue gas needs to be dissolved in water first and transferred from the gas phase to the liquid phase before it can fully contact with the slurry, and then react well with the calcium hydroxide and other components in the lime slurry to ultimately achieve the purpose of desulfurization.

[0047] However, in the actual pre-baked anode calcination process, the flue gas produced is very dry and has very low humidity. When the limestone gypsum spray flue gas desulfurization method is used, in the initial stage of the flue gas contact with the slurry, the flue gas lacks its own moisture to promote the dissolution of sulfur dioxide, and can only rely on the moisture in the slurry. This results in a large amount of slurry moisture being used to dissolve sulfur dioxide in the early stage of the reaction, so that the effective ingredients in the slurry (such as calcium hydroxide) cannot participate in the reaction in a timely and sufficient manner, reducing the utilization rate of the slurry. At the same time, since the dissolution of sulfur dioxide consumes a lot of time, the entire desulfurization reaction process is delayed and the desulfurization efficiency is also reduced. In addition, in order to achieve a certain desulfurization effect, the spraying amount of the slurry has to be increased, which not only increases the operating cost, but also may bring difficulties to subsequent treatment, such as generating more desulfurization wastewater and gypsum waste residue.

[0048] In this embodiment, the dry high-temperature flue gas generated by the calcination of the prebaked anode enters the pretreatment box 11 from the flue gas inlet 4. The pump body 16 continuously pumps the humidifying liquid in the humidifying pool 14 into the humidifying tube 15. The humidifying liquid flows out from the liquid outlet 17 at the top of the humidifying tube 15. Due to the gravity and the surface tension of the liquid, the humidifying liquid flows evenly along the outer wall of the humidifying tube 15 to form a continuous water curtain.

[0049] A wire hole may be opened on the side wall of the humidification tube 15 , and the connection line of the pump body 16 passes through the wire hole and is connected to an external control element and a power source, thereby realizing control over the operation of the pump body 16 .

[0050] When dry high-temperature flue gas flows through the water curtain around the humidification tube 15, heat is transferred from the flue gas to the surface of the water curtain. The sensible heat in the flue gas causes part of the liquid water on the surface of the water curtain to absorb heat and undergo a phase change, evaporating into water vapor. In this process, the temperature of the flue gas is significantly reduced, while its absolute humidity is increased, approaching a saturated state. The flue gas after humidification carries an appropriate amount of moisture and continues to flow upward through the smoke port 13 into the main spray reaction area of ​​the tower body 1. Since the flue gas already has suitable humidity conditions, sulfur dioxide can quickly dissolve in the moisture carried by the flue gas itself and the moisture in the slurry, and react quickly with components such as calcium hydroxide in the slurry.

[0051] By humidifying the flue gas in the pretreatment stage, a suitable humidity environment is created for the subsequent desulfurization reaction. When the flue gas contacts the lime slurry, it no longer relies too much on the water in the slurry to dissolve sulfur dioxide. This allows the effective ingredients in the slurry (such as calcium hydroxide) to participate more fully in the desulfurization reaction, improves the utilization rate of the slurry, and reduces the waste of the slurry. There is no need to increase the slurry spraying volume in order to compensate for the impact of flue gas drying on the desulfurization effect. The use of desulfurizer is reduced, and the operating cost is reduced.

[0052] In some examples, the liquid outlet 17 is inclined, the height of the liquid outlet 17 gradually decreases in the direction away from the center of the humidification tube 15 , and the diameter of the partition 12 is smaller than the diameter of the top of the pretreatment box 11 .

[0053] For example, Figure 6 As shown, the smoke outlet 13 is inclined, and its height gradually decreases in the direction away from the center of the humidification tube 15 . This structure effectively prevents the slurry sprayed by the nozzle 3 from flowing into the pretreatment box 11 .

[0054] The lime slurry sprayed from the nozzle 3 flows downward along the partition 12. Because the diameter of the partition 12 is smaller than the diameter of the top of the pretreatment box 11, when the slurry falls from the partition 12, it will fall on the hole wall of the smoke outlet 13, and flow into the gap between the pretreatment box 11 and the inner wall of the tower body 1 along the inclined hole wall of the smoke outlet 13. As a result, the slurry forms a water curtain between the partition 12 and the hole wall of the smoke outlet 13. When the flue gas passes through the smoke outlet 13, it contacts this water curtain and realizes secondary humidification, which creates more favorable humidity conditions for the subsequent desulfurization reaction, improves the dissolution efficiency of sulfur dioxide in the slurry, and thus improves the desulfurization efficiency.

[0055] The design of gradually decreasing the height of the smoke outlet 13 effectively prevents the slurry sprayed by the nozzle 3 from directly flowing into the pretreatment box 11, and prevents the equipment in the pretreatment box 11 (such as the humidification tank 14, the heat exchange coil 18, etc.) from being contaminated by the slurry, ensuring the normal operation of the pretreatment link and extending the service life of the equipment. The structural design of the partition 12 and the smoke outlet 13 realizes the secondary humidification function without increasing the volume of the equipment, and fully utilizes the internal space of the tower body 1.

[0056] In some examples, the outer wall of the humidification tube 15 is an inclined surface, a curved surface or a stepped surface.

[0057] For example, Figure 6 As shown, after the pump body 16 pumps the humidifying liquid in the humidifying pool 14 into the humidifying tube 15, the humidifying liquid flows out from the top liquid outlet 17. The dry high-temperature flue gas flows in the pretreatment box 11 and passes through the humidifying tube 15 with a special outer wall shape. The flue gas is fully in contact with the water curtain, the heat is quickly transferred, and the water vapor continuously evaporates into the flue gas, thereby effectively increasing the humidity of the flue gas and preparing for the subsequent desulfurization reaction. The design of the inclined surface, curved surface or stepped surface allows the water curtain to be more fully extended in three-dimensional space. The humidity of the flue gas after being humidified by a large area of ​​water curtain is more significantly increased. Without increasing the volume of the equipment and the amount of humidifying liquid used, the contact area between the water curtain and the flue gas is increased by changing the shape of the outer wall of the humidifying tube 15, thereby achieving efficient utilization of the equipment.

[0058] In some examples, a heat exchange coil 18 and a water tank are also included. The heat exchange coil 18 is arranged in the pretreatment box 11 and is arranged outside the humidification tube 15. The heat exchange coil 18 is spiral-shaped. The water tank is used to be arranged next to the tower body 1, and both ends of the heat exchange coil 18 are used to connect to the water tank.

[0059] For example, Figure 6 As shown, the spiral heat exchange coil 18 surrounds the humidification tube 15, the water tank is set outside the tower body 1, and the water in the water tank flows in from one end of the heat exchange coil 18. The heat of the high-temperature flue gas is transferred to the water in the heat exchange coil 18. After absorbing the heat of the flue gas, the temperature of the water gradually increases, forming hot water that flows out from the other end of the heat exchange coil 18 and returns to the water tank. The water in the water tank can be reused, for example, in other links in the plant that require hot water, such as preheating desulfurization liquid, heating domestic water, etc.

[0060] During the whole process, the spiral design allows the heat exchange coil 18 to have sufficient length to contact the flue gas, ensuring that the heat is fully transferred from the flue gas to the water, thus achieving efficient waste heat recovery. At the same time, the humidification tube 15 and the heat exchange coil 18 work together without interfering with each other, thus achieving both humidification of the flue gas and effective recovery of waste heat.

[0061] The flue gas temperature is lowered after waste heat recovery, which is conducive to the subsequent desulfurization reaction and improves the desulfurization efficiency. At the same time, the heated water can be used to preheat the desulfurization liquid so that the desulfurization liquid is at a more suitable temperature when entering the reaction area. The design of the heat exchange coil 18 surrounding the humidification tube 15 makes full use of the space in the pretreatment box 11, making the equipment structure more compact. This integrated design reduces the equipment footprint and reduces the difficulty of equipment installation and maintenance.

[0062] A flue gas desulfurization method for prebaked anode calcination in another embodiment of the present disclosure uses a flue gas desulfurization device for prebaked anode calcination, comprising the following steps: S1 Flue gas pretreatment: The high-temperature flue gas first enters the pretreatment box 11 through the flue gas inlet 4, and contacts the water curtain formed by the outer wall of the humidification tube 15, causing water evaporation, and humidifying the high-temperature flue gas; S2 Flue gas waste heat recovery: circulating water is passed through the heat exchange coil 18, and both ends are connected to the water source. The high-temperature flue gas is fully in contact with the outer wall of the heat exchange coil 18 in the pretreatment box 11, and efficient waste heat recovery is performed; S3 spraying high-efficiency desulfurization: the flue gas discharged from the pretreatment box 11 is fully in contact with the desulfurization liquid sprayed by the nozzle 3, and the bottom end of the nozzle 3 makes a circular motion, so that the desulfurization liquid constantly changes the angle of contact with the flue gas, and performs high-efficiency desulfurization.

[0063] For example, by humidifying the flue gas in the pretreatment stage, a suitable humidity environment is created for the subsequent desulfurization reaction. When the flue gas contacts the lime slurry, it no longer relies too much on the water in the slurry to dissolve sulfur dioxide. The flue gas temperature is reduced after waste heat recovery, which is conducive to the subsequent desulfurization reaction and improves the desulfurization efficiency. At the same time, the heated water can be used to preheat the desulfurization liquid so that the desulfurization liquid is at a more suitable temperature when entering the reaction area. The water outlet end of the nozzle 3 moves in a circle around the axis of the water outlet 6, so that the slurry can contact the flue gas from multiple different angles, improving the adequacy of the contact.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A prebaked anode calcined flue gas desulfurization device, characterized in that: The invention comprises a tower body (1), a main pipeline (2) and a nozzle (3), wherein the tower body (1) is provided with a flue gas inlet (4) and a flue gas outlet (5), the main pipeline (2) penetrates the tower body (1) and extends into the tower body (1), the main pipeline (2) is used to connect to a desulfurization liquid supply unit and transport desulfurization liquid into the tower body (1), the main pipeline (2) is provided with a water outlet (6), the top end of the nozzle (3) is spherically hinged in the water outlet (6) and is connected to the water outlet (6), the nozzle (3) can make a circular motion around the axis of the water outlet (6), and the bottom end of the nozzle (3) is a water outlet end.

2. A prebaked anode calcined flue gas desulfurization device according to claim 1, characterized in that: The invention also comprises a rotating frame (7), the rotating frame (7) being arranged in the tower body (1) so as to move along a circular trajectory, the rotating frame (7) being arranged eccentrically relative to the axis of the tower body (1), the rotating frame (7) having a mounting hole (8) for the nozzle (3) to pass through, the middle ball of the nozzle (3) being hinged in the mounting hole (8), and the rotating frame (7) being used to drive the bottom end of the nozzle (3) to perform circular motion around the axis of the water outlet hole (6).

3. A prebaked anode calcined flue gas desulfurization device according to claim 2, characterized in that: It also comprises a bracket (9) and a crank member (10), wherein the bracket (9) is arranged in the tower body (1), and the two ends of the crank member (10) are respectively hinged to the bracket (9) and the rotating frame body (7), and the crank member (10) is used to drive the rotating frame body (7) to move.

4. A prebaked anode calcined flue gas desulfurization device according to claim 3, characterized in that: The tower body (1) further comprises a driving motor (19), a first bevel gear (20) and a second bevel gear (21); the driving motor (19) is connected to the outer wall of the tower body (1); the first bevel gear (20) and the second bevel gear (21) are both rotatably arranged in the tower body (1); the first bevel gear (20) is meshed with the second bevel gear (21); the driving motor (19) is drivingly connected to the first bevel gear (20) for driving the first bevel gear (20) to rotate; the second bevel gear (21) is drivingly connected to the crank member (10) for driving the crank member (10) to rotate.

5. The prebaked anode calcined flue gas desulfurization device according to claim 1, characterized in that: The invention also comprises a pretreatment box (11) and a partition (12), wherein the pretreatment box (11) is arranged in the tower body (1) and below the nozzle (3), the smoke inlet (4) is connected to the pretreatment box (11), the partition (12) is arranged on the top of the pretreatment box (11), a smoke outlet (13) is provided between the partition (12) and the pretreatment box (11), the smoke outlet (13) is connected to the tower body (1), and there is a gap between the outer periphery of the pretreatment box (11) and the inner wall of the tower body (1).

6. A prebaked anode calcined flue gas desulfurization device according to claim 5, characterized in that: The pretreatment box (11) further comprises a humidifying pool (14), a humidifying tube (15) and a pump body (16). The humidifying pool (14) is arranged in the pretreatment box (11). The humidifying pool (14) contains humidifying liquid. The humidifying tube (15) is arranged in the humidifying pool (14). The lower end of the humidifying tube (15) is connected to the humidifying pool (14). The top of the humidifying tube (15) has a liquid outlet (17). The liquid outlet (17) is used for the humidifying liquid to flow out and forms a water curtain for humidifying the flue gas on the periphery of the humidifying tube (15). The pump body (16) is arranged in the humidifying tube (15) and is used for continuously pumping the humidifying liquid in the humidifying pool (14) into the humidifying tube (15).

7. A prebaked anode calcined flue gas desulfurization device according to claim 6, characterized in that: The liquid outlet hole (17) is arranged at an angle, and the height of the liquid outlet hole (17) gradually decreases in a direction away from the center of the humidification tube (15), and the diameter of the partition plate (12) is smaller than the diameter of the top of the pretreatment box (11).

8. The prebaked anode calcined flue gas desulfurization device according to claim 6, characterized in that: The outer wall of the humidification tube (15) is an inclined surface, a curved surface or a stepped surface.

9. The prebaked anode calcined flue gas desulfurization device according to claim 6, characterized in that: It also includes a heat exchange coil (18) and a water tank, wherein the heat exchange coil (18) is arranged in the pretreatment box (11) and is arranged outside the humidification tube (15), the heat exchange coil (18) is spiral-shaped, and the water tank is used to be arranged beside the tower body (1), and both ends of the heat exchange coil (18) are used to communicate with the water tank.

10. A method for flue gas desulfurization by calcining prebaked anodes, characterized in that: A flue gas desulfurization device using a prebaked anode calcination according to any one of claims 1 to 9 comprises the following steps: S1 flue gas pretreatment: the high-temperature flue gas first enters the pretreatment box (11) through the flue gas inlet (4), and contacts the water curtain formed by the outer wall of the humidification tube (15), causing water evaporation, thereby humidifying the high-temperature flue gas; S2 Flue gas waste heat recovery: circulating water is passed through the heat exchange coil (18), and both ends are connected to a water source. The high-temperature flue gas is fully in contact with the outer wall of the heat exchange coil (18) in the pretreatment box (11), so that efficient waste heat recovery is performed; S3 spraying high-efficiency desulfurization: the flue gas discharged from the pretreatment box (11) is fully in contact with the desulfurization liquid sprayed by the nozzle (3), and the bottom end of the nozzle (3) performs a circular motion, so that the desulfurization liquid continuously changes the angle of contact with the flue gas, thereby achieving high-efficiency desulfurization.

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