Flue gas desulfurization and denitrification treatment device and method for lead-zinc smelting

Abstract

The invention relates to the technical field of flue gas treatment equipment, in particular to a flue gas desulfurization and denitrification treatment device and method for lead-zinc smelting, a desulfurization mechanism is arranged, flue gas and a desulfurizer solution can be fully mixed, compared with a traditional spray mixing mode, the reaction efficiency is higher, blockage is not prone to occurring in the desulfurization process, and the desulfurization effect is better. The dedusting mechanism and the cleaning mechanism are arranged, the dedusting mechanism is beneficial for dedusting flue gas and removing dust and impurities carried in flue gas, meanwhile, the cleaning mechanism can be used for cleaning the spraying layer and removing accumulated reactants or products, and the anti-blocking mechanism is arranged, so that the desulfurization process is kept smooth; and the whole flue gas desulfurization and denitrification process can be smoothly carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment equipment, and in particular to a device and method for treating flue gas desulfurization and denitrification for lead and zinc smelting. Background Art

[0002] The large amount of flue gas generated during the lead and zinc smelting process contains sulfur dioxide (SO 2 ) and nitrogen oxides (NOx) and other pollutants, it is crucial to desulfurize and denitrify these flue gases. Although the commonly used flue gas desulfurization and denitrification technologies have achieved certain results, there are many problems in the desulfurization and denitrification process, among which the blockage of the spray layer is particularly prominent.

[0003] In the existing limestone- In the process of wet desulfurization of gypsum, the spray layer is one of the key components. When the existing spray layer nozzles spray slurry, some nozzles have poor atomization effect, the slurry particles are large, the contact area with the flue gas is small, and the reaction is insufficient, so that part of the flue gas is directly discharged without contacting the desulfurizer, which reduces the desulfurization effect. In addition, impurities, fly ash and incompletely reacted desulfurizer particles carried in the flue gas often gradually accumulate at the nozzles of the spray layer. The continuous accumulation of these particles will gradually reduce the nozzle diameter, seriously affecting the spraying effect of the slurry, and eventually causing the nozzle to be blocked. Once the spray layer is blocked, the cleaning work is extremely difficult. Since the spray layer is usually located at a higher position in the absorption tower, and the internal structure is complex and the space is small, it is difficult for personnel to enter for cleaning operations. Even if some special cleaning tools and equipment are used, it is often difficult to completely remove the blockage. During the cleaning process, it is also necessary to stop the operation of the entire desulfurization system, which will not only affect the normal production of lead and zinc smelting enterprises, but also increase the equipment maintenance cost and time cost. Moreover, frequent cleaning work may cause certain damage to the equipment of the spray layer, further reducing its service life and performance.

[0004] For this purpose, a device and method for desulfurization and denitrification of flue gas for lead and zinc smelting are invented to solve the problems arising from the above-mentioned background technology. Summary of the invention

[0005] In order to solve the problem that when the existing nozzle sprays slurry, the contact area with the flue gas is small, the reaction is insufficient, and the impurities, fly ash and incompletely reacted desulfurizer particles carried in the flue gas often gradually accumulate at the nozzle of the spray layer, causing the nozzle to be blocked, a flue gas desulfurization and denitrification treatment device and method for lead and zinc smelting are invented.

[0006] To achieve the above object, the present invention provides the following technical solution: a flue gas desulfurization and denitrification treatment device for lead and zinc smelting, comprising: A support assembly, used to support and fix the device, the support assembly includes a fixing frame, and the four corners of the lower end of the fixing frame are respectively provided with fixing legs; A dust removal mechanism, used for dust removal and filtering of the incoming flue gas, wherein the dust removal mechanism is arranged on the support assembly; A desulfurization mechanism, used for desulfurizing the flue gas, wherein the desulfurization mechanism is located at the upper end of the dust removal mechanism and is connected thereto; The anti-blocking mechanism is arranged inside the desulfurization mechanism and is used to automatically open when blockage occurs in the desulfurization mechanism, so that the flue gas can flow smoothly and the continuity of the desulfurization process can be ensured; A cleaning mechanism, which is located at the upper end of the desulfurization mechanism and is used to clean the desulfurization mechanism when a blockage occurs inside the desulfurization mechanism; The denitrification mechanism is used for denitrifying the flue gas, and the denitrification mechanism is arranged at the upper end of the desulfurization mechanism and is connected to the desulfurization mechanism.

[0007] Preferably, the dust removal mechanism comprises: An air intake duct, wherein the air intake duct is arranged on a fixing frame; A cyclone barrel, wherein the lower end of the cyclone barrel is configured to be conical and communicated with an air inlet pipe, the cyclone barrel is fixed on a fixing frame, and the air inlet end of the air inlet pipe forms a tangent angle with the inner wall of the cyclone barrel; A dust collecting chamber, the dust collecting chamber is arranged at the bottom of the cyclone barrel and is connected to the cyclone barrel; The spray assembly comprises a water supply tank, the water supply tank is arranged on the top of the cyclone barrel, an atomizing nozzle is arranged at the lower end of the water supply tank, and the atomizing nozzle is located in the cyclone barrel.

[0008] Preferably, a blower is provided on the fixing frame, and an output end of the blower is connected to an air intake duct.

[0009] Preferably, the desulfurization mechanism comprises: A main desulfurization channel, wherein the main desulfurization channel is located above the dust removal mechanism and is connected to the dust removal mechanism; A plurality of desulfurization secondary channels, wherein the desulfurization secondary channels are arranged in a circumferential array around the top of the desulfurization primary channel and are connected to the desulfurization primary channel; A plurality of first foaming discs, each of which corresponds to the desulfurization secondary channel one by one and is located in the desulfurization secondary channel, a plurality of foaming holes are formed on the first foaming disc, and a floating ring is arranged on the peripheral side of the first foaming disc, and the floating ring is slidably arranged in the desulfurization secondary channel; A desulfurization chamber, wherein a desulfurization agent is contained in the desulfurization chamber, and a desulfurization agent injection pump for injecting the desulfurization agent into the desulfurization chamber is arranged outside the desulfurization chamber; A plurality of discharge channels, wherein the discharge channels are located at the upper end of the desulfurization chamber; A plurality of second foaming discs, each of the second foaming discs corresponds to the discharge channel one by one and is arranged inside the discharge channel, and a plurality of foaming holes are formed on the second foaming disc; A liquid level meter, the liquid level meter is located in the discharge channel and is arranged above the second foaming disk; A rotatable rotating sleeve, on which a plurality of stirring rods are arranged, the rotating sleeve is rotatably connected in the desulfurization chamber and a rotating disk is arranged at the bottom of the rotating sleeve; The collecting chamber is located at the bottom of the desulfurization chamber and is connected to the desulfurization chamber, and comprises a rotatable rotating shell, and a flow guiding protrusion is arranged on the inner wall of the rotating shell.

[0010] Preferably, a first motor is provided at the lower end of the desulfurization chamber, the first motor is fixed in the desulfurization mechanism, a fourth gear is provided at the output end of the first motor, a fifth gear meshing with the fourth gear is provided on the rotating shell, and a sixth gear meshing with the fourth gear is provided at the bottom of the rotating sleeve.

[0011] Preferably, the anti-blocking mechanism comprises: An air intake secondary pipe, wherein a support rod is arranged in the air intake secondary pipe, a slidable closing plug is arranged on the support rod, a fixed compression spring is arranged on the top of the closing plug, the fixed compression spring is sleeved on the support rod, and the closing plug can close the air intake secondary pipe; A plurality of anti-blocking auxiliary pipelines are provided, wherein the anti-blocking auxiliary pipelines are located in the anti-blocking mechanism, and the other ends of the anti-blocking auxiliary pipelines are connected to the desulfurization chamber.

[0012] Preferably, the cleaning mechanism comprises: A rotating impeller, wherein the upper end of the support rod is provided with a rotating impeller, and the upper end of the rotating impeller is provided with a rotatable first gear, and the flue gas drives the rotating impeller to rotate when passing through the rotating impeller; A transmission chamber, the first gear is arranged in the transmission chamber, a second gear meshing with the first gear is arranged in the transmission chamber, a rotatable third gear is arranged in the transmission chamber, a driven pulley is arranged on the third gear, a driving pulley is arranged on the second gear, the driving pulley and the driven pulley are connected through a belt transmission, a transmission cylinder is arranged on the second gear, a first cleaning rod which can slide up and down is arranged in the transmission cylinder, a cleaning scraper which can clean the first foaming disk is arranged at the bottom of the first cleaning rod, a second cleaning rod which can clean the second foaming disk is arranged on the third gear, and a cleaning scraper which can clean the second foaming disk is arranged at the bottom of the second cleaning rod.

[0013] Preferably, the denitration mechanism comprises: a denitration channel, the denitration channel being in communication with the discharge channel, the denitration channel being provided with a denitration agent injection pump, the denitration agent injection pump being filled with a denitration reducing agent; A denitration chamber, wherein the denitration chamber is located at the top of the denitration mechanism, the bottom of the denitration chamber is configured as a liquid collecting chamber, and the top of the denitration chamber is configured as a discharge end; A water curtain nozzle, which is arranged in the denitration channel and is connected to the denitration agent injection pump, and is used for mixing the flue gas and the reducing agent; A water mist nozzle, which is arranged in the denitration channel and is connected to the denitration agent injection pump, and is used for further mixing the flue gas and the reducing agent; A flamethrower is located in the denitration chamber and heats the mixed gas.

[0014] A method for desulfurization and denitrification of flue gas for lead and zinc smelting, comprising the following steps: S1: The flue gas enters the dust removal mechanism through the air intake pipe for dust removal. When the flue gas enters the cyclone, it spirals along the inner wall of the cyclone, thereby filtering the dust and other particulate matter mixed in the flue gas. The flue gas is dust-filtered under the action of the cyclone, and the filtered dust falls into the dust collecting box; S2: The flue gas after dust removal and filtration flows upward and enters the desulfurization mechanism for desulfurization treatment. After entering the desulfurization main channel, the flue gas is dispersed into several airflows and enters the desulfurization secondary channel. Under the action of the first foaming disk, it is dispersed into a large number of bubbles and enters the desulfurization chamber to react with the desulfurizer to carry out the desulfurization process; In this process, limestone (CaCO 3 ) and sulfur dioxide (SO 2 ) to generate calcium sulfite (CaSO 3 ), calcium sulfite is further oxidized to calcium sulfate (CaSO 4 ), i.e. gypsum; S3: The flue gas after desulfurization enters the denitrification channel and mixes with the denitrification agent, and completes the denitrification reaction under the heating action of the flamethrower and is discharged from the denitrification chamber; Preferably, the method further comprises: In step S1, air is introduced into the air inlet duct through a blower. When a large amount of air enters the desulfurization chamber, it can promote the calcium sulfite (CaSO 3 ) is oxidized to calcium sulfate (CaSO 4 ), improve desulfurization efficiency.

[0015] Preferably, the method further comprises: In step S1, water mist is sprayed into the cyclone. The water mist generated by the spray can make some large dust particles stick together to form larger particle clusters. The centrifugal force of these particle clusters in the cyclone dust collector is enhanced, making them easier to be separated.

[0016] Preferably, the method further comprises: In step S2, the rotating disk and the rotating sleeve are rotated to stir the reactants in the desulfurization chamber and cause centrifugal action, so that the reactants can be better mixed, the reaction is more complete, and the product precipitate can be separated and collected.

[0017] The technical solution of the present invention can achieve the following beneficial effects: (1) The desulfurization mechanism is set up to facilitate the full mixing of flue gas and desulfurizer solution. Compared with the traditional spray mixing method, the reaction efficiency is higher and it is not easy to get blocked during the desulfurization process; (2) Setting up dust removal mechanism and cleaning mechanism. The dust removal mechanism is helpful to remove dust from flue gas and remove dust impurities carried in the flue gas. At the same time, the cleaning mechanism can clean the spray layer and remove the accumulated reactants or products; (3) Setting up an anti-blocking mechanism is conducive to keeping the desulfurization process unobstructed and maintaining the smooth progress of the entire flue gas desulfurization and denitrification process; The technical solution of the present invention has broad application prospects in the technical field of flue gas treatment equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional Figure Ⅰ ; Figure 2 The three-dimensional Figure II ; Figure 3 It is a front view of the present invention; Figure 4 It is a front view full cross-sectional view of the present invention; Figure 5 is a cutaway view of the transmission chamber of the present invention; Figure 6 It is a cross-sectional view of the desulfurization chamber and its connecting components of the present invention; Figure 7 It is a cut-away bottom view of the desulfurization chamber of the present invention; Figure 8 It is an enlarged view of the components of the cleaning mechanism of the present invention; Fig. 9 A diagram of a fourth gear and its connecting member of the present invention; Fig.10 For the present invention Figure 4 A magnified view of middle; Fig.11 For the present invention Figure 4 Enlarged view of middle B; Fig.12 For the present invention Figure 4Enlarged view of middle C; Among them, 1. Support assembly, 2. Dust removal mechanism, 3. Desulfurization mechanism, 4. Anti-blocking mechanism, 5. Cleaning mechanism, 6. Denitrification mechanism, 7. Air intake pipe, 8. Cyclone, 9. Dust collecting chamber, 10. Spray assembly, 11. Water supply tank, 12. Atomizing nozzle, 13. Blower, 14. Desulfurization main channel, 15. Desulfurization secondary channel, 16. First foaming disk, 17. Foaming hole, 18. Floating ring, 19. Desulfurization chamber, 20. Desulfurizer injection pump, 21. Discharge channel, 22. Second foaming disk, 23. Liquid level meter, 24. Rotating sleeve, 25. Stirring rod, 26. Rotating disk, 27. Collection chamber, 28. Rotating shell, 29. , guide protrusion, 30, first motor, 31, fourth gear, 32, fifth gear, 33, sixth gear, 34, air intake auxiliary pipe, 35, support rod, 36, closing plug, 37, fixed compression spring, 38, anti-blocking auxiliary pipe, 39, rotating impeller, 40, transmission chamber, 41, first gear, 42, second gear, 43, third gear, 44, driven pulley, 45, driving pulley, 46, transmission cylinder, 47, first cleaning rod, 48, cleaning scraper, 49, second cleaning rod, 50, denitrification channel, 51, denitrification agent injection pump, 52, denitrification chamber, 53, water curtain nozzle, 54, water mist nozzle, 55, flamethrower. DETAILED DESCRIPTION

[0019] The technical solutions of various embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing 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 therefore cannot be understood as a limitation on the present invention.

[0020] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present invention, 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figure 1 to Figure 12 The device for treating flue gas desulfurization and denitrification for lead and zinc smelting shown in the figure comprises: A support assembly 1 is used to support and fix the device. The support assembly 1 includes a fixing frame. The four corners of the lower end of the fixing frame are respectively welded and fixed with fixing legs to firmly support the device; The dust removal mechanism 2 is used to remove dust and filter the incoming flue gas. The dust removal mechanism 2 is fixedly arranged on the support assembly 1. The dust removal process is carried out on the flue gas through the dust removal mechanism 2. The flue gas used for lead and zinc smelting contains multiple components, and its main pollutant components are sulfur dioxide, nitrogen oxides, particulate matter (dust), etc. The dust removal mechanism 2 can remove particulate matter and dust in the flue gas. The filtered flue gas enters the desulfurization mechanism 3 upward; The desulfurization mechanism 3 is used for desulfurizing the flue gas. The desulfurization mechanism 3 is located at the upper end of the dust removal mechanism 2 and is connected thereto. The flue gas entering the dust removal mechanism 2 is filtered and dusted before entering the desulfurization mechanism 3 for desulfurization. After entering the desulfurization main channel 14, the flue gas is dispersed into a plurality of air streams and enters the desulfurization secondary channel 15. The flue gas passes through the desulfurization chamber 19 in the desulfurization mechanism 3 and reacts with the desulfurizer inside the desulfurization chamber 19 for desulfurization. Among them, this device adopts the limestone wet method for desulfurization process, and the main product is gypsum (CaSO 4 ・2H 2 O), which is usually in solid state; in the desulfurization process, the specific reaction process is: limestone (CaCO 3 ) and sulfur dioxide (SO 2 ) reaction, first generating calcium sulfite (CaSO 3 ), calcium sulfite is further oxidized to calcium sulfate (CaSO 4 ), calcium sulfate combines with a certain amount of water to form calcium sulfate dihydrate, i.e. gypsum. Gypsum generally exists in the desulfurization slurry in the form of solid particles. After dehydration and other treatments, it can be stacked, comprehensively utilized or disposed of as a solid product; The anti-blocking mechanism 4 is arranged on the inner side of the desulfurization mechanism 3, and is used to automatically open when blockage occurs in the desulfurization mechanism 3, so as to prevent blockage in the pipe or cavity in the desulfurization mechanism 3, so that the flue gas always keeps flowing and ensures the continuity of the desulfurization process; in the process of flue gas desulfurization and denitrification, especially in the process of limestone-gypsum wet desulfurization, the traditional method of mixing flue gas with desulfurizer is to pass the flue gas through the spray layer of the desulfurizer to achieve the mixing effect, and the desulfurizer slurry contains granular substances, so the incompletely reacted desulfurizer particles are very easy to accumulate at the nozzle of the spray layer, and at the same time, if the solid particle content in the slurry is too high, or the slurry concentration is improperly controlled, the spray layer pipeline will also be blocked, and the products generated in the desulfurization process are also easy to adhere to the nozzle, resulting in nozzle blockage. In industrial operation, blockage inside the equipment leads to shutdown, which will damage the equipment. Therefore, the anti-blocking mechanism 4 is conducive to keeping the desulfurization process unobstructed and keeping the whole flue gas desulfurization and denitrification process unobstructed; A cleaning mechanism 5, which is located at the upper end of the desulfurization mechanism 3 and is used to clean the desulfurization mechanism 3 when it is blocked; The denitrification mechanism 6 is used for denitrifying the flue gas. The denitrification mechanism 6 is arranged at the upper end of the desulfurization mechanism 3 and is connected to the desulfurization mechanism 3. The flue gas after the denitrification process is passed into a subsequent treatment process or discharged.

[0022] like Figure 1 to Figure 12 The dust removal mechanism 2 of the lead-zinc smelting flue gas desulfurization and denitrification treatment device shown includes: An air intake duct 7, the air intake duct 7 is arranged on a fixing frame; The cyclone cylinder 8 has a cone-shaped lower end which is connected to the air inlet pipe 7. The cyclone cylinder 8 is fixed on a fixed frame, and the air inlet end of the air inlet pipe 7 forms a tangent angle with the inner wall of the cyclone cylinder 8. A dust collecting chamber 9, which is disposed at the bottom of the cyclone barrel 8 and is in communication with the cyclone barrel 8; The demisting assembly 10 , the spray assembly 10 includes a water supply tank 11 , the water supply tank 11 is arranged on the top of the cyclone barrel 8 , an atomizing nozzle 12 is arranged at the lower end of the water supply tank 11 , and the atomizing nozzle 12 is located in the cyclone barrel 8 .

[0023] Among them, the air inlet duct 7 is used to introduce flue gas into the cyclone 8. In the cyclone 8, the dust-containing flue gas flow enters the cyclone 8 from the air inlet duct 7 of the cyclone 8 along the tangential direction at a relatively high speed (generally 15-25 m / s). The air flow rotates in the cyclone 8 to form an outer vortex that rotates downward. Due to the inertia of the rotating air flow, the air flow will spiral downward along the inner wall of the cyclone 8. During the rotation of the air flow, the dust particles will move toward the outer wall due to the centrifugal force. The magnitude of the centrifugal force is related to the mass of the particles, the rotation speed and the rotation radius. The faster the rotation speed and the smaller the rotation radius, the greater the centrifugal force, which makes the dust The particles can overcome the drag of the airflow and approach the wall. When the dust particles reach the wall, they lose their inertia and fall along the wall under the combined action of the airflow and their own gravity, and enter the dust collecting chamber 9. The dust collecting chamber 9 is used to collect the separated dust. The dust collecting chamber 9 is cleaned regularly, and the collected dust can be discharged from the cyclone 8. When the rotating and descending external cyclone airflow reaches the cone, it moves closer to the center of the cyclone 8 due to the contraction of the cone, and its tangential speed continues to increase. When the airflow reaches a certain position at the lower end of the cone, it swirls from bottom to top in the cyclone 8 in the same rotation direction, continues to make spiral motion, forms an internal vortex, and finally the purified gas is discharged into the desulfurization mechanism 3; Among them, the water supply tank 11 is fixedly connected to the top of the cyclone barrel 8, and six atomizing nozzles 12 are fixedly connected inside the cyclone barrel 8 to spray water mist into the cyclone barrel 8. The water mist generated by the spray can make some large particles of dust stick to each other to form larger particle clusters. The centrifugal force of these particle clusters in the cyclone dust collector is enhanced and they are easier to be separated.

[0024] like Figure 1 to Figure 12 In the shown device for treating flue gas desulfurization and denitrification for lead and zinc smelting, a blower 13 is arranged on a fixed frame, and an output end of the blower 13 is connected to an air intake pipe 7 .

[0025] The blower 13 is fixedly connected to the fixed frame, and air is introduced into the air inlet pipe 7 through the blower 13. When a large amount of air enters the desulfurization chamber 19, it can promote the calcium sulfite (CaSO 3 ) is oxidized to calcium sulfate (CaSO 4 ), improve the desulfurization efficiency, at the same time, the flue gas may contain some incompletely oxidized substances, such as carbon monoxide (CO), hydrocarbons, etc. The introduction of air can provide more oxygen to promote the oxidation reaction of these substances and convert them into carbon dioxide (CO 2 ) and water (H 2 O) and other harmless substances.

[0026] like Figure 1 to Figure 12 The desulfurization and denitrification treatment device for flue gas used in lead and zinc smelting is shown, and the desulfurization mechanism 3 includes: A desulfurization main channel 14, the desulfurization main channel 14 is located above the dust removal mechanism 2 and is connected to the dust removal mechanism 2; A plurality of desulfurization secondary channels 15, wherein the desulfurization secondary channels 15 are arranged in a circumferential array around the top of the desulfurization primary channel 14 and are connected to the desulfurization primary channel 14; A plurality of first foaming discs 16, each of the first foaming discs 16 corresponds to the desulfurization auxiliary channel 15 one by one and is located in the desulfurization auxiliary channel 15, a plurality of foaming holes 17 are opened on the first foaming disc 16, and a floating ring 18 is fixedly connected to the peripheral side of the first foaming disc 16, and the floating ring 18 is slidably connected in the desulfurization auxiliary channel 15; A desulfurization chamber 19, in which a desulfurization agent is contained, and a desulfurization agent injection pump 20 is fixed outside the desulfurization chamber 19 for injecting the desulfurization agent into the desulfurization chamber 19; A plurality of discharge channels 21, the discharge channels 21 being located at the upper end of the desulfurization chamber 19; A plurality of second foaming discs 22, each of the second foaming discs 22 corresponds to the discharge channel 21 and is fixed inside the discharge channel 21, and a plurality of foaming holes 17 are formed on the second foaming discs 22; A liquid level meter 23, which is fixedly connected to the discharge channel 21 and is located above the second foaming disk 22; A rotatable rotating sleeve 24, on which a plurality of stirring rods 25 are welded and fixed, the rotating sleeve 24 is rotatably connected in the desulfurization chamber 19 and a rotating disk 26 is fixedly connected to the bottom of the rotating sleeve 24; The collecting chamber 27 is located at the bottom of the desulfurization chamber 19 and is connected to the desulfurization chamber 19 . The collecting chamber 27 includes a rotatable rotating shell 28 . A flow guide protrusion 29 is provided on the inner wall of the rotating shell 28 .

[0027] The flue gas after dust removal and filtration is dispersed into multiple air streams after entering the desulfurization main channel 14 and enters the desulfurization secondary channel 15 for desulfurization treatment. After entering the desulfurization secondary channel 15, the flue gas is dispersed into a large number of bubbles under the action of the first foaming disk 16 and enters the desulfurization chamber 19 to react with the desulfurizer to perform the desulfurization process. The floating ring 18 drives the first foaming disk 16 to move up and down, so that the first foaming disk 16 always floats according to the height of the desulfurizer slurry in the desulfurization chamber 19, which makes the flue gas dispersed into bubbles when passing through the first foaming disk 16. The desulfurizer is selected as limestone (CaCO 3) is reacted in the desulfurization chamber 19, the sulfur dioxide in the flue gas is removed, and the remaining gas is discharged through the exhaust channel 21. The second foaming disk 22 is always below the liquid level. The second foaming disk 22 can break up the bubbles again to improve the mixing degree of the flue gas and the desulfurizer. In order to improve the reaction efficiency, during implementation, the diameter of the foaming holes 17 on the second foaming disk 22 can be smaller than the diameter of the first foaming holes 17. The liquid level meter 23 selects a float type liquid level meter 23, which is convenient for monitoring the slurry height in the desulfurization chamber 19 and for replenishing the desulfurizer in time. By rotating the stirring rod 25, the reactants can be better mixed and the reaction is more sufficient. By rotating the rotating disk 26 and the rotating sleeve 24, the reactants in the desulfurization chamber 19 are rotated, stirred and centrifuged, and the product precipitation can be separated and collected.

[0028] like Figure 1 to Figure 12 A flue gas desulfurization and denitrification treatment device for lead and zinc smelting is shown, and a first motor 30 is fixedly connected to the lower end of the desulfurization chamber 19, and the first motor 30 is fixed in the desulfurization mechanism 3. The output end of the first motor 30 is fixedly connected to a fourth gear 31, and the fourth gear 31 is rotatably connected in the desulfurization chamber 19. A fifth gear 32 that can mesh with the fourth gear 31 is fixed on the rotating shell 28, and the rotating shell 28 and the desulfurization chamber 19 can rotate relative to each other. A sixth gear 33 that can mesh with the fourth gear 31 is fixedly connected to the bottom of the rotating sleeve 24, and the sixth gear 33 is rotatably connected in the desulfurization chamber 19. The fourth gear 31 rotates to drive the fifth gear 32 and the sixth gear 33 to rotate, the fifth gear 32 drives the rotating shell 28 to rotate, and the sixth gear 33 drives the rotating sleeve 24 to rotate.

[0029] like Figure 1 to Figure 12 In the lead-zinc smelting flue gas desulfurization and denitrification treatment device shown, the anti-blocking mechanism 4 includes: The air intake secondary pipe 34 is fixed above the desulfurization main channel 14. A support rod 35 is fixedly connected inside the air intake secondary pipe 34. A slidable closing plug 36 is slidably connected to the support rod 35. A fixed compression spring 37 is fixedly connected to the top of the closing plug 36. The fixed compression spring 37 is sleeved on the support rod 35. The closing plug 36 can close the air intake secondary pipe 34. A plurality of anti-blocking auxiliary pipes 38 are provided, wherein the anti-blocking auxiliary pipes 38 are fixed in the anti-blocking mechanism 4 , and the other end of the anti-blocking auxiliary pipes 38 is connected to the desulfurization chamber 19 .

[0030] Among them, when the desulfurization main channel 14 is blocked, the air pressure in the desulfurization main channel 14 increases. At this time, the closing plug 36 squeezes the fixed compression spring 37, and the closing plug 36 moves upward. The flue gas enters the anti-blocking sub-pipeline 38 through the air intake sub-pipeline 34 and enters the desulfurization chamber 19 through the anti-blocking sub-pipeline 38 to react.

[0031] like Figure 1 to Figure 12 The flue gas desulfurization and denitrification treatment device for lead and zinc smelting shown in the figure, the cleaning mechanism 5 includes: Rotating impeller 39, the upper end of the support rod 35 is rotatably connected to the rotating impeller 39, and the upper end of the rotating impeller 39 is fixedly connected to a rotatable first gear 41, and the flue gas drives the rotating impeller 39 to rotate when passing through the rotating impeller 39; A transmission chamber 40, a first gear 41 is rotatably connected in the transmission chamber 40, the transmission chamber 40 is located at the upper end of the desulfurization mechanism 3, a second gear 42 that can mesh with the first gear 41 is rotatably connected in the transmission chamber 40, a rotatable third gear 43 is rotatably connected in the transmission chamber 40, a driven pulley 44 is fixedly connected to the third gear 43, a driving pulley 45 is fixedly connected to the second gear 42, the driving pulley 45 is connected to the driven pulley 44 through a belt transmission, a transmission cylinder 46 is fixedly connected to the lower end of the second gear 42, a first cleaning rod 47 that can slide up and down is slidably connected in the transmission cylinder 46, a cleaning scraper 48 that can clean the first foaming disk 16 is fixedly connected to the bottom of the first cleaning rod 47, a second cleaning rod 49 that can clean the second foaming disk 22 is fixedly connected to the third gear 43, and a cleaning scraper 48 that can clean the second foaming disk 22 is fixedly connected to the bottom of the second cleaning rod 49.

[0032] Among them, the second cleaning rod 49 and the first cleaning rod 47 are both inserted into the desulfurization chamber 19, and the cleaning scraper 48 includes two upper and lower scraping strips. The first foaming disk 16 and the second foaming disk 22 are respectively located between the two scraping strips on their corresponding sides. When the rotating impeller 39 rotates, it drives the first gear 41 to rotate, and the rotation of the first gear 41 drives the second gear 42 to rotate. The rotation of the second gear 42 drives the driving pulley 45 to rotate. At the same time, the second gear 42 drives the transmission cylinder 46 to rotate, and the transmission cylinder 46 drives the first cleaning rod 47 to rotate. The driving pulley 45 drives the driven pulley 44 to rotate, and the driven pulley 44 drives the second cleaning rod 49 to rotate. The cleaning scrapers 48 on the second cleaning rod 49 and the first cleaning rod 47 clean the second foaming disk 22 and the first foaming disk 16 respectively.

[0033] like Figure 1 to Figure 12 A flue gas desulfurization and denitrification treatment device for lead and zinc smelting is shown, and the denitrification mechanism includes: A denitration channel 50, the denitration channel 50 is connected to the discharge channel 21, and a denitration agent injection pump 51 is fixedly connected to the denitration channel 50, and a denitration agent injection pump 51 is filled with a denitration reducing agent; A denitration chamber 52, wherein the denitration chamber 52 is located at the top of the denitration mechanism, the bottom of the denitration chamber 52 is provided as a liquid collecting chamber, and the top of the denitration chamber 52 is provided as a discharge end; A water curtain nozzle 53, which is fixed in the denitration channel 50 and is connected to the denitration agent injection pump 51, and is used for mixing the flue gas and the reducing agent; A water mist nozzle 54, which is fixed in the denitration channel 50 and is connected to the denitration agent injection pump 51, and is used for further mixing the flue gas and the reducing agent; The flamethrower 55 is fixed in the denitration chamber 52 and heats the mixed gas.

[0034] The flue gas after the desulfurization process is fully mixed with the denitration reducing agent under the action of the water curtain nozzle 53 and the water mist nozzle 54 and flows into the denitration chamber 52 to be heated, thereby completing the denitration reaction. The denitration process adopts the selective non-catalytic reduction method (SNCR) to carry out the denitration reaction. The denitration reducing agent uses ammonia or urea solution. Under high temperature environment, the reducing agent reacts with NOx; The reducing agent reacts with nitrogen oxides (mainly NO and NO 2 ) undergoes a chemical reaction, reducing it to nitrogen (N 2 ) and water (H 2 O). When ammonia is used as the reducing agent, the main reaction is: 4NH 3 + 4NO + O 2 → 4N 2 + 6H 2 O 2NH 3 + NO + NO 2 → 2N 2 + 3H 2 O When urea is used as a reducing agent, urea will first decompose into ammonia, and then ammonia will react with nitrogen oxides. The urea decomposition reaction is: CO(NH 2 ) 2 → 2NH 3 + CO 2 A method for desulfurization and denitrification of flue gas for lead and zinc smelting, comprising the following steps: S1: The flue gas enters the dust removal mechanism 2 through the air inlet pipe 7 for dust removal. When the flue gas enters the cyclone 8, it flows in a spiral along the inner wall of the cyclone 8, thereby filtering the dust and other particulate matter mixed in the flue gas. The flue gas is dust-removed and filtered under the action of the cyclone 8, and the filtered dust falls into the dust collecting box; S2: The flue gas after dust removal and filtration flows upward and enters the desulfurization mechanism 3 for desulfurization treatment. After entering the desulfurization main channel 14, the flue gas is dispersed into several airflows and enters the desulfurization secondary channel 15. Under the action of the first foaming disk 16, it is dispersed into a large number of bubbles and enters the desulfurization chamber 19 to react with the desulfurizer to carry out the desulfurization process; In this process, limestone (CaCO 3 ) and sulfur dioxide (SO 2 ) to generate calcium sulfite (CaSO 3 ), calcium sulfite is further oxidized to calcium sulfate (CaSO 4 ), i.e. gypsum; S3: The flue gas after desulfurization enters the denitration channel 50 and mixes with the denitration agent, and completes the denitration reaction under the heating effect of the flamethrower 55 and is discharged from the denitration chamber 52.

[0035] A specific embodiment is that the method further includes: In step S1, air is introduced into the air inlet pipe 7, and air is introduced into the air inlet pipe 7 through the blower 13. When a large amount of air enters the desulfurization chamber 19, it can promote the calcium sulfite (CaSO 3 ) is oxidized to calcium sulfate (CaSO 4 ), improve desulfurization efficiency.

[0036] A specific embodiment is that the method further includes: In step S1, water mist is sprayed into the cyclone 8. The water mist generated by the spraying can make some large dust particles stick together to form larger particle clusters. The centrifugal force of these particle clusters in the cyclone dust collector is enhanced, making them easier to be separated.

[0037] A specific embodiment is that the method further includes: In step S2, by rotating the rotating disk 26 and the rotating sleeve 24, the reactants in the desulfurization chamber 19 are rotated, stirred and centrifuged, so that the reactants can be better mixed, the reaction is more complete, and the product precipitate can be separated and collected.

[0038] The working principle of the device has been explained through the above embodiments. The above embodiments only express several implementation methods of the present invention. The description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A flue gas desulfurization and denitrification treatment device for lead and zinc smelting, characterized in that: include: A support assembly (1) for supporting and fixing the device, the support assembly (1) comprising a fixing frame, and fixing legs are respectively arranged at four corners of the lower end of the fixing frame; A dust removal mechanism (2) is used to remove dust and filter the incoming flue gas, and the dust removal mechanism (2) is arranged on the support assembly (1); A desulfurization mechanism (3) is used to perform a desulfurization process on the flue gas, wherein the desulfurization mechanism (3) is located at the upper end of the dust removal mechanism (2) and is connected thereto; an anti-blocking mechanism (4), the anti-blocking mechanism (4) being arranged inside the desulfurization mechanism (3) and being used to automatically open when blockage occurs in the desulfurization mechanism (3), so as to keep the flue gas flowing and ensure the continuity of the desulfurization process; A cleaning mechanism (5), the cleaning mechanism (5) being located at the upper end of the desulfurization mechanism (3) and being used to clean the desulfurization mechanism (3) when blockage occurs inside the desulfurization mechanism (3); The denitrification mechanism (6) is used to perform a denitrification process on the flue gas, and the denitrification mechanism (6) is arranged at the upper end of the desulfurization mechanism (3) and is connected to the desulfurization mechanism (3).

2. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: The dust removal mechanism (2) comprises: An air intake duct (7), wherein the air intake duct (7) is arranged on a fixing frame; a cyclone barrel (8), wherein the lower end of the cyclone barrel (8) is arranged in a conical shape and is in communication with the air inlet pipe (7); the cyclone barrel (8) is fixed on a fixing frame; and the air inlet end of the air inlet pipe (7) forms a tangent angle with the inner wall of the cyclone barrel (8); A dust collecting chamber (9), the dust collecting chamber (9) being arranged at the bottom of the cyclone barrel (8) and being in communication with the cyclone barrel (8); A spray assembly (10), the spray assembly (10) comprising a water supply tank (11), the water supply tank (11) being arranged at the top of a cyclone barrel (8), an atomizing nozzle (12) being arranged at the lower end of the water supply tank (11), the atomizing nozzle (12) being located in the cyclone barrel (8).

3. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 2, characterized in that: A blower (13) is arranged on the fixing frame, and an output end of the blower (13) is in communication with an air intake duct (7).

4. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: The desulfurization mechanism (3) comprises: A desulfurization main channel (14), the desulfurization main channel (14) being located above the dust removal mechanism (2) and being in communication with the dust removal mechanism (2); A plurality of desulfurization secondary channels (15), wherein the desulfurization secondary channels (15) are arranged in a circumferential array around the top of the desulfurization primary channel (14) and are connected to the desulfurization primary channel (14); A plurality of first foaming discs (16), wherein the first foaming discs (16) correspond one to one with the desulfurization auxiliary channel (15) and are located in the desulfurization auxiliary channel (15), the first foaming discs (16) are provided with a plurality of foaming holes (17), and a floating ring (18) is provided on the peripheral side of the first foaming disc (16), and the floating ring (18) is slidably arranged in the desulfurization auxiliary channel (15); A desulfurization chamber (19), wherein a desulfurization agent is contained in the desulfurization chamber (19), and a desulfurization agent injection pump (20) is arranged outside the desulfurization chamber (19) for injecting the desulfurization agent into the desulfurization chamber (19); A plurality of discharge channels (21), wherein the discharge channels (21) are located at the upper end of the desulfurization chamber (19); a plurality of second foaming discs (22), the second foaming discs (22) corresponding one to one with the discharge channels (21) and arranged inside the discharge channels (21), the second foaming discs (22) being provided with a plurality of foaming holes (17); A liquid level meter (23), the liquid level meter (23) being located in the discharge channel (21) and arranged above the second foaming disk (22); A rotatable rotating sleeve (24), wherein a plurality of stirring rods (25) are arranged on the rotating sleeve (24), the rotating sleeve (24) is rotatably connected in the desulfurization chamber (19), and a rotating disk (26) is arranged at the bottom of the rotating sleeve (24); A collecting chamber (27), the collecting chamber (27) being located at the bottom of the desulfurization chamber (19) and being in communication with the desulfurization chamber (19), comprising a rotatable rotating shell (28), wherein a flow guide protrusion (29) is provided on the inner wall of the rotating shell (28).

5. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: A first motor (30) is disposed at the lower end of the desulfurization chamber (19), the first motor (30) being fixed in the desulfurization mechanism (3), a fourth gear (31) being disposed at the output end of the first motor (30), a fifth gear (32) being meshed with the fourth gear (31) being disposed on the rotating shell (28), and a sixth gear (33) being meshed with the fourth gear (31) being disposed at the bottom of the rotating sleeve (24).

6. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: The anti-blocking mechanism (4) comprises: An air intake auxiliary pipe (34), wherein a support rod (35) is disposed in the air intake auxiliary pipe (34), a slidable closing plug (36) is disposed on the support rod (35), a fixed compression spring (37) is disposed on the top of the closing plug (36), the fixed compression spring (37) is sleeved on the support rod (35), and the closing plug (36) can close the air intake auxiliary pipe (34); A plurality of anti-blocking auxiliary pipes (38), wherein the anti-blocking auxiliary pipes (38) are located in the anti-blocking mechanism (4), and the other ends of the anti-blocking auxiliary pipes (38) are connected to the desulfurization chamber (19).

7. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: The cleaning mechanism (5) comprises: A rotating impeller (39), wherein the upper end of the support rod (35) is provided with a rotating impeller (39), and the upper end of the rotating impeller (39) is provided with a rotatable first gear (41), and when the flue gas passes through the rotating impeller (39), the rotating impeller (39) is driven to rotate; A transmission cavity (40), wherein the first gear (41) is arranged in the transmission cavity (40), wherein a second gear (42) meshing with the first gear (41) is arranged in the transmission cavity (40), wherein a rotatable third gear (43) is arranged in the transmission cavity (40), wherein a driven pulley (44) is arranged on the third gear (43), wherein a driving pulley (45) is arranged on the second gear (42), wherein the driving pulley (45) is connected to the driven pulley (44) via a belt transmission, and wherein the second gear (42) is connected to the driven pulley (44) via a belt transmission. The wheel (42) is provided with a transmission cylinder (46), a first cleaning rod (47) which can slide up and down is provided in the transmission cylinder (46), a cleaning scraper (48) which can clean the first foaming disk (16) is provided at the bottom of the first cleaning rod (47), a second cleaning rod (49) which can clean the second foaming disk (22) is provided on the third gear (43), and a cleaning scraper (48) which can clean the second foaming disk (22) is provided at the bottom of the second cleaning rod (49).

8. The flue gas desulfurization and denitrification treatment device for lead and zinc smelting according to claim 1, characterized in that: The denitration mechanism comprises: a denitration channel (50), the denitration channel (50) being in communication with the discharge channel (21), the denitration channel (50) being provided with a denitration agent injection pump (51), the denitration agent injection pump (51) being filled with a denitration reducing agent; A denitration chamber (52), the denitration chamber (52) being located at the top of the denitration mechanism, the bottom of the denitration chamber (52) being arranged as a liquid collecting chamber, and the top of the denitration chamber (52) being arranged as a discharge end; A water curtain nozzle (53), the water curtain nozzle (53) being arranged in the denitration channel (50) and being connected to the denitration agent injection pump (51), and being used for mixing the flue gas and the reducing agent; A water mist nozzle (54), the water mist nozzle (54) being arranged in the denitration channel (50) and being connected to the denitration agent injection pump (51), and being used for further mixing the flue gas and the reducing agent; A flamethrower (55) is located in the denitration chamber (52) and heats the mixed gas.

9. The method for desulfurization and denitrification of flue gas for lead and zinc smelting according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The flue gas is introduced into the dust removal mechanism (2) through the air inlet pipe (7) for dust removal. When the flue gas enters the cyclone (8), it flows in a spiral along the inner wall of the cyclone (8), thereby filtering particulate matter such as dust contained in the flue gas. The flue gas is dust-removed and filtered under the action of the cyclone (8), and the filtered dust falls into the dust collecting box; S2: The flue gas after dust removal and filtration flows upward and enters the desulfurization mechanism (3) for desulfurization treatment. After entering the desulfurization main channel (14), the flue gas is dispersed into a plurality of air streams and enters the desulfurization secondary channel (15). Under the action of the first foaming disk (16), the flue gas is dispersed into a large number of bubbles and enters the desulfurization chamber (19) to react with the desulfurizer to carry out the desulfurization process; In this process, a slurry made from limestone (CaCO3) reacts with sulfur dioxide (SO2) in the flue gas to produce calcium sulfite (CaSO3), which is further oxidized to calcium sulfate (CaSO4), i.e. gypsum, by the action of oxidizing air; S3: the flue gas after desulfurization enters the denitration channel (50) and mixes with the denitrification agent, and completes the denitration reaction under the heating action of the flamethrower (55) and is discharged from the denitration chamber (52); The method further comprises: In step S1, air is introduced into the air inlet pipe (7). Air is introduced into the air inlet pipe (7) through the blower (13). When a large amount of air enters the desulfurization chamber (19), it can promote the oxidation of calcium sulfite (CaSO3) and convert it into calcium sulfate (CaSO4), thereby improving the desulfurization efficiency. In step S1, water mist is sprayed into the cyclone (8). The water mist generated by the spraying can cause some large dust particles to adhere to each other to form larger particle clusters. The centrifugal force of these particle clusters in the cyclone dust collector is enhanced, making them easier to separate; In step S2, the rotating disk (26) and the rotating sleeve (24) are rotated to rotate and stir the reactants in the desulfurization chamber (19) and generate a centrifugal effect, so that the reactants can be better mixed, the reaction can be more complete, and the product precipitate can be separated and collected.

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