Flue gas denitration and desulfurization washing system

Abstract

The utility model discloses a flue gas denitration desulfurization washing system relates to flue gas treatment technical field, including by the mixed box of integrally forming from below and above, denitration box and desulfurization box, and the one end of mixed box is provided with the air inlet structure for the flue gas is passed into, and the other end is connected with the air pipe for the ammonia gas is passed into, and the inside rotation of mixed box is connected with the fan blade of by flue gas and ammonia gas impact drive, and the passage is arranged between mixed box and air inlet structure, and the filter screen is arranged below the passage, and the knocking mechanism of periodic knock filter screen is arranged on the fan blade body. In the utility model, through the import of flue gas and ammonia gas symmetrical arrangement in the two sides of fan blade, drive fan blade rotation, realize energy -conserving while, complete flue gas and reducing agent's full, even mixing, through the linkage of rotation rod and knock rod mechanism, realized the periodic, automatic mechanical dust removal to filter screen, solved the difficult problem that traditional fixed filter screen is easy to block, ensured that system can long -term continuous stable operation.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and in particular to a flue gas denitrification and desulfurization scrubbing system. Background Technology

[0002] In industrial production, flue gas is generated during the combustion of coal, oil, and gas, which needs to be denitrified and desulfurized. Denitrification mainly uses selective catalytic reduction technology, which reduces the flue gas into non-toxic and harmless nitrogen and water through chemical reaction. Desulfurization, on the other hand, uses alkaline liquid to react with acidic sulfur dioxide to generate stable salts, thereby capturing sulfur dioxide from the flue gas.

[0003] Currently, in order to achieve the mixing of the reducing agent and flue gas before the catalyst layer in denitrification technology, a stirrer is required for stirring. However, the mixing requires an additional motor, which increases energy consumption. In addition, a filter screen needs to be installed before the catalyst layer to filter the dust in the flue gas to prevent dust from clogging the catalyst layer. However, after long-term use, the filter screen needs to be replaced by shutting down the system, which affects the efficiency of the flue gas denitrification and desulfurization system. Summary of the Invention

[0004] The purpose of this utility model is to provide a flue gas denitrification and desulfurization scrubbing system to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a flue gas denitrification and desulfurization scrubbing system, comprising a mixing box, a denitrification box, and a desulfurization box integrally formed from bottom to top. One end of the mixing box is provided with an air inlet structure for introducing flue gas, and the other end is connected to an air inlet pipe for introducing ammonia gas. Inside the mixing box, a fan blade driven by the impact of flue gas and ammonia gas is rotatably connected. A channel is provided between the mixing box and the air inlet structure. A filter screen is provided below the channel. A striking mechanism for periodically striking the filter screen is provided on the fan blade. The air intake structure includes a heat exchange shell, inside which are provided an air intake pipe for circulating flue gas and a circulation pipe for circulating cooling medium, the air intake pipe and the circulation pipe being arranged in an alternating spiral pattern within the heat exchange shell; The fan blade consists of a rotating rod and blades. The rotating rod is rotatably mounted on the inner wall of the mixing chamber, and two sets of blades are arranged in an array on both sides of the rotating rod. The outlet of the air intake pipe extending into the mixing chamber is located at the lower part of one side blade, and the outlet of the air vent pipe extending into the mixing chamber is located at the upper part of the other side blade. The striking mechanism includes a cam and a fixed cylinder. The cam is installed at the middle end of the rotating rod. A collar is connected inside the fixed cylinder by a spring. A striking rod that passes through the spring and the fixed cylinder is installed inside the collar. A pressing block that fits against the outside of the cam is installed at the bottom end of the striking rod. The top end of the striking rod touches the bottom of the filter screen.

[0006] Preferably, the top of the fixed cylinder is threaded with a trumpet-shaped collecting cover, and the upper end of the striking rod passes through the collecting cover.

[0007] Preferably, the filter screen is composed of a mesh plate and reinforcing ribs, the reinforcing ribs being composed of a central ring, an outer ring, and an array of rods connecting them, and a locking block for fixing the filter screen is provided at the top inside the mixing box.

[0008] Preferably, the denitrification box has multiple catalyst layers arranged at equal intervals inside. One end of the denitrification box and the desulfurization box is connected to a first connecting pipe, and the other end of the desulfurization box is connected to a second connecting pipe. A circulation pump is installed on the second connecting pipe, and a sprayer is connected to the end of the second connecting pipe that extends into the desulfurization box. An exhaust pipe is connected to the top of the desulfurization box, and an induced draft fan is installed on the exhaust pipe.

[0009] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this application, by symmetrically arranging the flue gas and ammonia inlets on both sides of the fan blade, the kinetic energy of the process fluid itself is cleverly used to drive the fan blade to rotate, eliminating the need for an additional motor. This achieves energy saving while ensuring thorough and uniform mixing of flue gas and reducing agent, laying a solid foundation for subsequent efficient denitrification.

[0010] 2. In this application, by linking the rotating rod with the striking rod mechanism, the periodic and automatic mechanical cleaning of the filter screen is realized. This design fundamentally solves the problem of easy clogging of traditional fixed filter screens, ensures that the system can operate continuously and stably for a long time, and greatly reduces maintenance costs and workload. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown; Figure 2 A cross-sectional view of the internal structure of the mixing tank, denitrification tank, and desulfurization tank according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the fan blade and striking mechanism provided according to an embodiment of the present utility model is shown; Figure 4 A cross-sectional view of the heat exchange shell structure provided according to an embodiment of the present invention is shown; Figure 5A cross-sectional view of the internal structure of the mixing tank according to an embodiment of the present invention is shown; Figure 6 A bottom view of a filter structure provided according to an embodiment of the present invention is shown.

[0012] Legend: 1. Mixing box; 2. Air inlet structure; 201. Heat exchange shell; 202. Air inlet pipe; 203. Circulation pipe; 3. Ventilation pipe; 4. Denitrification box; 5. Desulfurization box; 6. Channel; 7. Filter screen; 701. Mesh plate; 702. Reinforcing rib; 8. Fan blade; 801. Rotating rod; 802. Blade; 9. Striking mechanism; 901. Cam; 902. Fixed cylinder; 903. Spring; 904. Collar; 905. Striking rod; 906. Extrusion block; 10. Catalyst layer; 11. First connecting pipe; 12. Exhaust fan; 13. Second connecting pipe; 14. Circulation pump; 15. Sprayer; 16. Air outlet pipe; 17. Collection hood; 18. Clamping block. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a flue gas denitrification and desulfurization scrubbing system, including a mixing box 1, a denitrification box 4, and a desulfurization box 5 integrally formed from bottom to top. One end of the mixing box 1 is provided with an air inlet structure 2 for introducing flue gas, and the other end is connected to an air inlet pipe 3 for introducing ammonia. Inside the mixing box 1, a fan blade 8 driven by the impact of flue gas and ammonia is rotatably connected. A channel 6 is provided between the mixing box 1 and the air inlet structure 2. A filter screen 7 is provided below the channel 6. A striking mechanism 9 is provided on the fan blade 8 to periodically strike the filter screen 7.

[0015] Specifically, such as Figure 4 As shown, the air intake structure 2 includes a heat exchange shell 201. The heat exchange shell 201 is provided with an air intake pipe 202 for circulating flue gas and a circulation pipe 203 for circulating cooling medium. The air intake pipe 202 and the circulation pipe 203 are arranged in an alternating spiral shape inside the heat exchange shell 201. The spiral inlet pipe 202 significantly extends the effective heat exchange path of the flue gas within the limited shell space. At the same time, its curved shape increases the turbulence of the flue gas flow and disrupts the boundary layer, thereby significantly improving the heat exchange efficiency between the flue gas and the cooling medium in the circulation pipe 203. The staggered spiral coil layout enables the cooling medium and the flue gas to form a large area of ​​counter-current or cross-flow heat exchange, achieving uniform and stable cooling of the flue gas.

[0016] Specifically, such as Figure 3 and Figure 5 As shown, the fan blade 8 is composed of a rotating rod 801 and blades 802. The rotating rod 801 is rotatably installed on the inner wall of the mixing box 1. Two sets of blades 802 are arranged in an array on both sides of the rotating rod 801. The outlet of the air inlet pipe 202 extending into the mixing box 1 is located at the lower part of one side of the blades 802, and the outlet of the air vent pipe 3 extending into the mixing box 1 is located at the upper part of the other side of the blades 802. The flue gas flow from the intake pipe 202 impacts the lower part of one side blade 802, while the ammonia flow from the ventilation pipe 3 impacts the upper part of the other side blade 802. The driving torque generated by the two airflows on the fan blade 8 is in the same direction and is superimposed, which efficiently drives the rotating rod 801 and the blade 802 to rotate continuously, thereby greatly enhancing the turbulent mixing effect of flue gas and ammonia.

[0017] Specifically, such as Figure 3 As shown, the striking mechanism 9 includes a cam 901 and a fixed cylinder 902. The cam 901 is installed at the middle end of the rotating rod 801. The inside of the fixed cylinder 902 is connected to a collar 904 by a spring 903. The inside of the collar 904 is installed a striking rod 905 that passes through the spring 903 and the fixed cylinder 902. The bottom end of the striking rod 905 is equipped with a pressing block 906 that fits against the outside of the cam 901. The top end of the striking rod 905 touches the bottom of the filter screen 7. When the rotating rod 801 drives the cam 901 to rotate, the eccentric profile of the cam 901 periodically pushes up the striking rod 905, causing its top end to strike the bottom of the filter screen 7. After the cam 901 rotates past its highest point, the striking rod 905 falls under the reset action of the spring 903, completing one reciprocating cycle.

[0018] Specifically, such as Figure 5 As shown, the top of the fixed cylinder 902 is threaded with a trumpet-shaped collection cover 17, and the upper end of the striking rod 905 passes through the collection cover 17. The collection cover 17 is located below the filter screen 7, and its top diameter is matched with the diameter of the filter screen 7, and is used to collect the dust shaken off during the striking.

[0019] Specifically, such as Figure 5 and Figure 6As shown, the filter screen 7 consists of a mesh plate 701 and a reinforcing rib 702. The reinforcing rib 702 consists of a central ring, an outer ring, and an array of rods connecting them. The inner wall of the mixing box 1 below the channel 6 is provided with a locking block 18 for installing and removing the filter screen 7. The reinforcing rib 702 is designed to enhance the structural rigidity of the mesh plate 701 and disperse the impact force to prevent local deformation or damage caused by long-term point contact impact.

[0020] Specifically, such as Figure 2 As shown, multiple catalyst layers 10 are equidistantly arranged inside the denitrification box 4. One end of the denitrification box 4 and the desulfurization box 5 are connected to a first connecting pipe 11, so that the denitrified gas in the denitrification box 4 enters the desulfurization box 5 through the first connecting pipe 11. The other end of the desulfurization box 5 is connected to a second connecting pipe 13, and a circulation pump 14 is installed on the second connecting pipe 13. The end of the second connecting pipe 13 that extends into the desulfurization box 5 is connected to a sprayer 15. The limestone slurry in the desulfurization box 5 is circulated through the circulation pump 14, the second connecting pipe 13 and the sprayer 15. The top of the desulfurization box 5 is connected to an exhaust pipe 16, and an induced draft fan 12 is installed on the exhaust pipe 16. The purified flue gas is discharged through the exhaust pipe 16 by the induced draft fan 12.

[0021] In summary, the working principle of the flue gas denitrification and desulfurization scrubbing system provided in this embodiment is as follows: Flue gas pretreatment and energy recovery stage: High-temperature flue gas enters from the inlet pipe 202 of the inlet structure 2. The inlet pipe 202 and the circulation pipe 203 for the cooling medium are arranged in an alternating spiral shape in the heat exchange shell 201, and the flue gas undergoes efficient heat exchange with the cooling medium in the circulation pipe 203 to achieve uniform and stable cooling of the flue gas. Self-driven mixing: The cooled flue gas flows out from the outlet of the inlet pipe 202 and impacts the lower part of the blade 802 on one side. At the same time, ammonia gas is sprayed out from the ventilation pipe 3 and impacts the upper part of the blade 802 on the other side. The driving torque generated by the two airflows is in the same direction and is superimposed to efficiently drive the rotating rod 801 and the blade 802 to rotate continuously, so that the flue gas and ammonia gas are fully and uniformly mixed in turbulent flow. Self-cleaning filtration: The mixed gas then passes through the filter screen 7, where large dust particles are trapped. At the same time, the rotating rod 801 drives the cam 901 on it to rotate synchronously. The eccentric profile of the cam 901 periodically pushes up the striking rod 905, causing its top to strike the bottom of the filter screen 7. When the cam 901 rotates past the highest point, the striking rod 905 falls under the reset action of the spring 903, completing one reciprocating cycle of striking, causing the filter screen 7 to vibrate, shaking off the accumulated dust, and collecting it by the trumpet-shaped collection hood 17 below. SCR denitrification: The thoroughly mixed and filtered clean gas enters the denitrification chamber 4 under the system power provided by the induced draft fan 12. The gas passes through the catalyst layer 10 set at equal intervals. On the surface of the catalyst layer 10, ammonia and nitrogen oxides undergo a selective catalytic reduction reaction to generate harmless nitrogen and water. Wet desulfurization: The denitrified gas enters the desulfurization box 5 through the first connecting pipe 11. The circulating pump 14 transports limestone slurry to the sprayer 15 through the second connecting pipe 13 for spraying. The flue gas and slurry come into countercurrent contact. The sulfur dioxide in the slurry reacts chemically with the alkaline slurry, is captured and generates stable salts. The purified clean flue gas is discharged into the atmosphere through the exhaust pipe 16 under the suction of the induced draft fan 12.

[0022] The above description of the embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue gas denitrification and desulfurization scrubbing system, characterized in that, The mixture includes a mixing box (1), a denitrification box (4), and a desulfurization box (5) integrally formed from bottom to top. One end of the mixing box (1) is provided with an air inlet structure (2) for introducing flue gas, and the other end is connected to an air inlet pipe (3) for introducing ammonia. The mixing box (1) is rotatably connected with a fan blade (8) driven by the impact of flue gas and ammonia. A channel (6) is provided between the mixing box (1) and the air inlet structure (2). A filter screen (7) is provided below the channel (6). A knocking mechanism (9) is provided on the fan blade (8) to periodically knock on the filter screen (7). The air intake structure (2) includes a heat exchange shell (201), and the interior of the heat exchange shell (201) is provided with an air intake pipe (202) for circulating flue gas and a circulation pipe (203) for circulating cooling medium. The air intake pipe (202) and the circulation pipe (203) are arranged in an alternating spiral shape inside the heat exchange shell (201). The fan blade (8) consists of a rotating rod (801) and blades (802). The rotating rod (801) is rotatably mounted on the inner wall of the mixing box (1), and two sets of blades (802) are arranged in an array on both sides of the rotating rod (801). The outlet of the air intake pipe (202) extending into the mixing box (1) is located at the lower part of one side blade (802), and the outlet of the air vent pipe (3) extending into the mixing box (1) is located at the upper part of the other side blade (802). The striking mechanism (9) includes a cam (901) and a fixed cylinder (902). The cam (901) is installed at the middle end of the rotating rod (801). A collar (904) is connected inside the fixed cylinder (902) by a spring (903). A striking rod (905) that passes through the spring (903) and the fixed cylinder (902) is installed inside the collar (904). A pressing block (906) that fits against the outside of the cam (901) is installed at the bottom end of the striking rod (905). The top end of the striking rod (905) touches the bottom of the filter screen (7).

2. The flue gas denitrification and desulfurization scrubbing system according to claim 1, characterized in that, The top of the fixed cylinder (902) is threaded with a trumpet-shaped collection cover (17), and the upper end of the striking rod (905) passes through the collection cover (17).

3. The flue gas denitrification and desulfurization scrubbing system according to claim 1, characterized in that, The filter screen (7) is composed of a mesh plate (701) and a reinforcing rib (702). The reinforcing rib (702) is composed of a central ring, an outer ring and an array of rods connected between them. The top of the mixing box (1) is provided with a locking block (18) for fixing the filter screen (7).

4. The flue gas denitrification and desulfurization scrubbing system according to claim 1, characterized in that, The denitrification box (4) has multiple catalyst layers (10) arranged at equal intervals inside. The denitrification box (4) and the desulfurization box (5) are connected at one end by a first connecting pipe (11) and at the other end by a second connecting pipe (13). A circulating pump (14) is installed on the second connecting pipe (13). A sprayer (15) is connected to the end of the second connecting pipe (13) that extends into the desulfurization box (5). An exhaust pipe (16) is connected to the top of the desulfurization box (5). An induced draft fan (12) is installed on the exhaust pipe (16).

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