Packed tower for flue gas desulfurization and denitrification

Abstract

The invention belongs to the technical field of flue gas treatment, particularly relates to a packed tower for flue gas desulfurization and denitrification, and provides the following scheme aiming at the problem that the desulfurization effect is reduced due to the fact that an existing packed tower cannot treat crystals on the inner wall in the desulfurization process: the packed tower comprises a desulfurization tower, and a nitrogen removal tower and a mixing tank are arranged outside the desulfurization tower; a conveying pipe and a smoke exhaust pipe are arranged on the desulfurization tower, one end, far away from the desulfurization tower, of the conveying pipe is communicated with the nitrogen removal tower, a plurality of spraying pipes I which are distributed at equal intervals are arranged on the nitrogen removal tower, and a smoke conveying pipe is arranged on one side, far away from the desulfurization tower, of the nitrogen removal tower. The packed tower for flue gas desulfurization and denitrification disclosed by the invention can be used for effectively cleaning calcium sulfate crystals attached to the inner wall of the desulfurization tower, so that the situation that the flue gas circulation area is reduced due to excessive accumulation of the calcium sulfate crystals is reduced, and the contact area between flue gas and limestone emulsion is ensured; and the desulfurization effect of the flue gas is not influenced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to a packed tower for flue gas desulfurization and denitrification. Background Art

[0002] Flue gas is a mixture of gas and smoke, and is the main cause of air pollution in residential areas. The composition of flue gas is very complex. The gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons and nitrogen oxides, etc. The smoke includes fuel ash, coal particles, oil droplets and high-temperature cracking products.

[0003] The existing desulfurization packed tower desulfurizes by spraying limestone emulsion on the flue gas. During the desulfurization process, the calcium sulfite reacts with oxygen to form calcium sulfate. When saturation is reached, calcium sulfate crystals are generated. These crystals will crystallize on the inner wall of the packed tower and accumulate continuously, reducing the cross-sectional area of ​​the flue gas flowing in the tower, thereby forcing the speed of flue gas circulation to increase, resulting in a decrease in the contact time and contact area between the flue gas and the limestone emulsion, affecting the desulfurization effect. Summary of the invention

[0004] The invention discloses a packed tower for flue gas desulfurization and denitrification, aiming to solve the technical problem in the background technology that the existing packed tower cannot process crystals on the inner wall during the desulfurization process, resulting in reduced desulfurization effect.

[0005] The present invention proposes a packed tower for flue gas desulfurization and denitrification, comprising a desulfurization tower, a denitrification tower and a mixing tank are arranged outside the desulfurization tower, and a delivery pipe and a smoke exhaust pipe are arranged on the desulfurization tower, one end of the delivery pipe away from the desulfurization tower is connected to the denitrification tower, a plurality of spray pipes 1 distributed equidistantly are arranged on the denitrification tower, a smoke delivery pipe is arranged on the side of the denitrification tower away from the desulfurization tower, a spray pipe 2 is arranged on the desulfurization tower, a crystallization processing module is arranged below the spray pipe 2, a waste heat recycling module is arranged on the mixing tank, and a liquid infusion pipe is arranged on the spray pipe 2, and one end of the liquid infusion pipe away from the spray pipe 2 is connected to the mixing tank; The crystallization processing module comprises an inner mounting ring, an outer mounting ring is arranged outside the inner mounting ring, and an outer covering ring is fixedly connected to the bottom of the outer mounting ring; The waste heat recycling module includes a heat exchange tank and an oil storage tank.

[0006] By providing a desulfurization tower, a denitrification tower, a mixing pool, a powder tank, a crystallization treatment module and a waste heat recycling module, the device can use the crystallization treatment module to effectively clean the calcium sulfate crystals attached to the inner wall of the desulfurization tower, thereby reducing the reduction in flue gas flow area caused by excessive accumulation of calcium sulfate crystals, thereby ensuring the contact area between the flue gas and the limestone emulsion, and ensuring that the desulfurization effect of the flue gas is not affected.

[0007] In a preferred embodiment, the inner wall of the outer ring is provided with an inner embedded ring, the bottom of the inner embedded ring is fixedly connected with an annular crushing disk, a plurality of hydraulic rods equidistantly distributed on the circumference are provided between the inner ring and the outer ring, the output ends of the hydraulic rods are fixedly connected with the upper side of the inner embedded ring, and the outsides of the hydraulic rods are fixedly connected with connecting plates, the bottoms of the connecting plates are slidably connected with the upper sides of the inner ring and the outer ring; the upper sides of the plurality of connecting plates are fixedly connected with motor 1, the output ends of the motor 1 are connected with gears through couplings, the upper side of the outer ring is fixedly connected with an inner gear ring, the plurality of gears are meshed with the inner gear ring, and the upper side of the inner ring is fixedly connected with an inner gear ring. A plurality of connecting frames are fixedly connected, and the ends of the connecting frames away from the inner ring are fixedly connected to the outside of the inner gear ring, and a second pump is arranged outside the mixing tank, and the output end of the second pump is connected to the infusion tube through a thin tube, and a powder tank is arranged outside the mixing tank, and the bottom of the powder tank is connected to a powder delivery pipe through a flange, and the end of the powder delivery pipe away from the powder tank is located in the mixing tank, and a water delivery pipe is arranged on the mixing tank; a threaded groove is provided on the inner wall of the outer ring, and two protrusions are fixedly connected to the outside of the inner ring, and the outside of the protrusions are slidably connected to the inner wall of the threaded groove, and a third pump is arranged outside the powder tank, and the output end of the third pump is connected to the powder delivery pipe through a conduit, A fan is arranged outside the desulfurization tower, and the output end of the fan is connected to the desulfurization tower through an air duct. A circular hole is provided on the desulfurization tower, and a drain pipe is fixedly connected to the inner wall of the circular hole; four circumferentially equidistantly distributed fixed frames are fixedly connected to the inner wall of the desulfurization tower, and connecting parts are slidably connected inside the fixed frames, and the bottoms of the four connecting parts are fixedly connected to the upper side of the mounting inner ring, and insertion holes are provided at the bottom of the fixed frames and the outside of the connecting parts, and the upper sides of the four fixed frames are fixedly connected to isolation frames; the upper sides of the four fixed frames are fixedly connected to stabilizing shafts, and the upper sides of the stabilizing shafts are fixedly connected to the top inner wall of the isolation frame on the same side, and the outsides of the stabilizing shafts are slidably connected to the top inner wall of the isolation frame on the same side. Symmetrical inclined plane blocks 1 and 2 are connected, and springs are wrapped around the outside of the stabilizing shaft, one end of the springs is in contact with the top inner wall of the isolation frame on the same side, and the other end is in contact with the upper side of the inclined plane block 2 on the same side; four isolation frames are provided with transverse grooves, and shift blocks are slidably connected in the transverse grooves, and the shift blocks are fixedly connected to the opposite side of the inclined plane block 1 on the same side, and vertical grooves are provided on the isolation frames, and the vertical grooves are connected to the transverse grooves on the same side, and U-shaped frames are slidably connected in the vertical grooves, one end of the U-shaped frame is fixedly connected to the outside of the inclined plane block 2 on the same side, and the other end is fixedly connected to a pin, and the outside of the pin is plugged into the insertion hole on the same side.

[0008] By providing a crystallization processing module, the crystallization processing module utilizes an outer ring and an inner ring to enable the annular crushing disk to perform a stable rotation and descending motion with the assistance of a hydraulic rod and an electric motor, thereby achieving efficient cleaning of the crystals and greatly improving the cleaning efficiency of calcium sulfate crystals. The outer ring and the inner ring arranged close to the inner wall of the desulfurization tower also ensure the pass rate of the flue gas and reduce the adverse effects on flue gas desulfurization.

[0009] In a preferred embodiment, the oil storage tank is fixedly connected to the side opposite to the denitrification tower, and the denitrification tower is provided with a plurality of equally spaced soaking plates, and the ends of the soaking plates away from the denitrification tower are all located in the oil storage tank. The bottom of the heat exchange box is fixedly connected to the bottom inner wall of the mixing tank, and a circular opening is provided at the bottom of the oil storage tank, and an oil injection pipe is fixedly connected to the circular opening, and the end of the oil injection pipe away from the oil storage tank passes through the mixing tank and is connected to the heat exchange box; a narrow opening is provided on the heat exchange box, and a reflux pipe is fixedly connected to the inner wall of the narrow opening, and the reflux pipe is away from the heat exchange box. One end of the box is connected to the upper side of the oil storage tank through a flange, and a pump 1 is fixedly connected to the upper side of the oil storage tank, and the output end of the pump 1 is connected to the return pipe through a round tube, and an external frame is fixedly connected to the outside of the mixing tank; a hole groove is opened on the external frame, and a shaft rod is movably connected in the hole groove, and a stirring paddle is fixedly connected to the bottom of the shaft rod, and a motor 2 is fixedly connected to the upper side of the external frame, and the output end of the motor 2 is fixedly connected to the upper side of the shaft rod through a coupling, and a plurality of equidistantly distributed cooling fins are arranged on the outside of the heat exchange box.

[0010] By providing a waste heat recycling module, the waste heat recycling module uses a heat spreader and a heat exchange box to enable the device to reuse the waste heat of the flue gas in the denitrification tower, increase the liquid temperature in the mixing pool, thereby increasing the solubility of limestone, further improving the desulfurization effect of the device and reducing energy consumption.

[0011] From the above, it can be seen that the packed tower for flue gas desulfurization and denitrification provided by the present invention can effectively clean the calcium sulfate crystals attached to the inner wall of the desulfurization tower, thereby reducing the reduction in flue gas flow area caused by excessive accumulation of calcium sulfate crystals, thereby ensuring the contact area between the flue gas and the limestone emulsion, and ensuring that the desulfurization effect of the flue gas is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of a packed tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 2 This is a schematic diagram of a top view of a packed tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 3 A schematic diagram of the structure of a desulfurization tower of a packed tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 4 This is a schematic diagram of the structure of a crystallization processing module of a packed tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 5 This is a schematic diagram of the isolation frame structure of a packed tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 6 This is a schematic diagram of the structure of the outer ring and inner ring of a packing tower for flue gas desulfurization and denitrification proposed by the present invention; Figure 7 This is a schematic diagram of the structure of a waste heat recycling module of a packed tower for flue gas desulfurization and denitrification proposed by the present invention.

[0013] In the figure: 1, desulfurization tower; 2, denitrification tower; 3, mixing tank; 4, powder tank; 5, spray pipe 1; 6, smoke pipe; 7, conveying pipe; 8, crystallization treatment module; 801, fixing frame; 802, inner ring installation; 803, outer ring installation; 804, connecting frame; 805, connecting piece; 806, insertion hole; 807, isolation frame; 808, stabilizing shaft; 809, inclined plane block 1; 810, inclined plane block 2; 811, spring; 812, U-shaped frame; 813, latch; 814, shifting block; 815, horizontal slot; 816, vertical slot; 817, hydraulic rod; 818, connecting plate; 819, motor 1; 8 20. Gear; 821. Internal gear ring; 822. Outer ring; 823. Threaded groove; 824. Inner ring; 825. Bump; 826. Annular crushing disk; 9. Waste heat recycling module; 901. Oil storage tank; 902. Heat spreader; 903. Heat exchange box; 904. Oil filling pipe; 905. Reflux pipe; 906. Pump one; 907. External rack; 908. Motor two; 909. Agitator; 910. Cooling fins; 10. Smoke exhaust pipe; 11. Spray pipe two; 12. Liquid delivery pipe; 13. Pump two; 14. Powder delivery pipe; 15. Pump three; 16. Water delivery pipe; 17. Fan; 18. Liquid discharge pipe. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] The packed tower for flue gas desulfurization and denitrification disclosed in the present invention is mainly used in the scenario where the existing packed tower cannot handle crystals on the inner wall during the desulfurization process, resulting in reduced desulfurization effect.

[0016] Reference Figure 1-Figure 7 A packed tower for flue gas desulfurization and denitrification comprises a desulfurization tower 1, a denitrification tower 2 and a mixing pool 3 are arranged outside the desulfurization tower 1, and a delivery pipe 7 and a smoke exhaust pipe 10 are arranged on the desulfurization tower 1, and the end of the delivery pipe 7 away from the desulfurization tower 1 is connected to the denitrification tower 2, and a plurality of equally distributed spray pipes 5 are arranged on the denitrification tower 2, and a smoke delivery pipe 6 is arranged on the side of the denitrification tower 2 away from the desulfurization tower 1, and a spray pipe 2 11 is arranged on the desulfurization tower 1, and a crystallization processing module 8 is arranged below the spray pipe 2 11, and a waste heat recycling module 9 is arranged on the mixing pool 3, and a liquid infusion pipe 12 is arranged on the spray pipe 2 11, and the end of the liquid infusion pipe 12 away from the spray pipe 2 11 is connected to the mixing pool 3; The crystallization processing module 8 includes an inner mounting ring 802, an outer mounting ring 803 is arranged outside the inner mounting ring 802, and an outer covering ring 822 is connected to the bottom of the outer mounting ring 803 by bolts; The waste heat recycling module 9 includes a heat exchange tank 903 and an oil storage tank 901 .

[0017] Specifically, the flue gas enters the denitrification tower 2 through the smoke delivery pipe 6, and the ammonia water is sprayed out through the spray pipe 1 5 and contacts with the flue gas. Under the action of the catalyst, the nitrogen oxides in the flue gas are decomposed into nitrogen and water. The remaining flue gas enters the desulfurization tower 1 through the delivery pipe 7. The pump 3 15 pumps the limestone powder in the powder tank 4 into the mixing tank 3 and mixes it with the water delivered by the water delivery pipe 16 to form a limestone emulsion, which is pumped into the spray pipe 2 11 through the delivery pipe 12 by the pump 2 13 and sprayed onto the flue gas in the desulfurization tower 1. The waste heat recycling module 9 absorbs the waste heat of the flue gas in the denitrification tower 2 and conducts it to the mixing tank 3 to heat the emulsion. The emulsion reacts with the sulfide in the flue gas to form calcium sulfite, and a part of it falls to the bottom of the desulfurization tower 1. Part of the calcium sulfite adheres to the inner wall of the desulfurization tower 1, and the fan 17 conveys oxidizing air into the desulfurization tower 1 to make the calcium sulfite react into calcium sulfate. After saturation, calcium sulfite crystals are precipitated, and the crystallization processing module 8 is used to clean the calcium sulfite crystals attached to the inner wall of the desulfurization tower 1 to ensure the flue gas flow. The precipitate at the bottom of the desulfurization tower 1 is discharged through the drain pipe 18, and the harmless flue gas is discharged through the exhaust pipe 10; the device can effectively clean the calcium sulfate crystals attached to the inner wall of the desulfurization tower 1 by using the crystallization processing module 8, thereby reducing the reduction of the flue gas flow area caused by the excessive accumulation of calcium sulfate crystals, thereby ensuring the contact area between the flue gas and the limestone emulsion, and ensuring that the desulfurization effect of the flue gas is not affected.

[0018] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6In a preferred embodiment, an inner wall of the outer ring 822 is provided with an inner ring 824, and the bottom of the inner ring 824 is connected with an annular crushing disk 826 by bolts. A plurality of hydraulic rods 817 are arranged between the inner ring 802 and the outer ring 803, and the output ends of the hydraulic rods 817 are connected with the upper side of the inner ring 824 by bolts, and the outer sides of the hydraulic rods 817 are connected with connecting plates 818 by bolts, and the bottoms of the connecting plates 818 are connected with the upper sides of the inner ring 802 and the outer ring 803 by sliding; the upper sides of the plurality of connecting plates 818 are connected with motors 819 by bolts, and the output ends of the motors 819 are connected with couplings. The device is connected with a gear 820, and an inner gear ring 821 is connected to the upper side of the outer ring 803 by bolts, and multiple gears 820 are meshed with the inner gear ring 821, and multiple connecting frames 804 are connected to the upper side of the inner ring 802 by bolts, and the ends of the connecting frames 804 away from the inner ring 802 are connected to the outside of the inner gear ring 821 by bolts, and a pump 13 is arranged outside the mixing tank 3, and the output end of the pump 13 is connected to the infusion tube 12 through a capillary tube, and a powder tank 4 is arranged outside the mixing tank 3, and the bottom of the powder tank 4 is connected to a powder delivery pipe 14 through a flange, and the end of the powder delivery pipe 14 away from the powder tank 4 is located in the mixing tank 3, and a water delivery pipe 16 is arranged on the mixing tank 3; The inner wall of the outer ring 822 is provided with a threaded groove 823, and the outer part of the inner ring 824 is connected with two protrusions 825 by bolts, and the outer parts of the protrusions 825 are slidably connected with the inner wall of the threaded groove 823, and the outer part of the powder tank 4 is provided with a pump 3 15, and the output end of the pump 3 15 is connected with the powder conveying pipe 14 through a conduit, and the outer part of the desulfurization tower 1 is provided with a fan 17, and the output end of the fan 17 is connected with the desulfurization tower 1 through an air duct, and the desulfurization tower 1 is provided with a circular hole, and the circular hole is provided. The inner wall of the hole is connected with a drain pipe 18 by bolts; the inner wall of the desulfurization tower 1 is connected with four circumferentially equidistant fixed frames 801 by bolts, and the fixed frames 801 are slidably connected with connecting pieces 805, and the bottoms of the four connecting pieces 805 are connected with the upper side of the mounting inner ring 802 by bolts, and the bottom of the fixed frame 801 and the outside of the connecting piece 805 are provided with insertion holes 806, and the upper sides of the four fixed frames 801 are connected with isolation frames 807 by bolts; The upper sides of the four fixed frames 801 are all connected to the stabilizing shaft 808 by bolts, and the upper sides of the stabilizing shaft 808 are all connected to the top inner wall of the isolation frame 807 on the same side by bolts, and the outside of the stabilizing shaft 808 is slidably connected to the symmetrical inclined plane block 1 809 and inclined plane block 2 810, and the outside of the stabilizing shaft 808 is surrounded by a spring 811, one end of the spring 811 is in contact with the top inner wall of the isolation frame 807 on the same side, and the other end is in contact with the upper side of the inclined plane block 2 810 on the same side; the four isolation frames 807 are all provided with a transverse groove 808. 15, a shift block 814 is slidably connected in the transverse groove 815, and the side of the shift block 814 opposite to the inclined block 1 809 on the same side is connected by bolts, and a vertical groove 816 is opened on the isolation frame 807, and the vertical groove 816 is connected to the transverse groove 815 on the same side, and a U-shaped frame 812 is slidably connected in the vertical groove 816, one end of the U-shaped frame 812 is connected to the outside of the inclined block 2 810 on the same side by bolts, and the other end is connected to a pin 813 by bolts, and the outside of the pin 813 is plugged into the insertion hole 806 on the same side.

[0019] Specifically, when calcium sulfate crystals are present on the inner wall of the desulfurization tower 1, the hydraulic rod 817 and the motor 819 are started, and the motor 819 drives the gear 820 to rotate, so that the motor 819 meshing with the inner gear ring 821 drives the connecting plate 818 to rotate on the mounting inner ring 802 and the mounting outer ring 803, and the output end of the hydraulic rod 817 is extended and provides a downward force to the embedded ring 824, so that the protrusion 825 on the embedded ring 824 moves in the thread groove 823, so that the embedded ring 824 drives the annular crushing disk 826 to move downward during the rotation, and the attached to the inner wall of the desulfurization tower 1 is crushed. The calcium sulfate crystals on the wall are crushed and cleaned. When the crystallization processing module 8 needs to be disassembled, the shift block 814 is moved to rotate the shift block 814 180 degrees with a stable axis 808 on the transverse groove 815 as the axis, so that the inclined surfaces on the inclined surface block 1 809 and the inclined surface block 2 810 are parallel. Under the elastic force of the spring 811, the two inclined surfaces fit together when the inclined surface block 2 810 descends, and the descending inclined surface block 2 810 drives the U-shaped frame 812 to move downward, thereby pulling the pin 813 out of the insertion hole 806, rotating the inner ring 802, and turning the connecting piece 805 out of the fixed frame 801.

[0020] In specific application scenarios, the crystallization processing module 8 is mainly suitable for the crystallization processing link in the crystallization processing process, that is, the crystallization processing module 8 uses the outer ring 822 and the inner ring 824 to enable the annular crushing disk 826 to perform a stable rotation and descending movement with the assistance of the hydraulic rod 817 and the motor 819, thereby realizing efficient cleaning of the crystals, greatly improving the cleaning efficiency of calcium sulfate crystals, and the outer ring 822 and the inner ring 824 arranged close to the inner wall of the desulfurization tower 1 also ensure the pass rate of the flue gas, reducing the adverse effects on flue gas desulfurization.

[0021] Reference Figure 7 In a preferred embodiment, the oil storage tank 901 is connected to the opposite side of the denitrification tower 2 by bolts, and the denitrification tower 2 is provided with a plurality of equally spaced heat spreaders 902, and the ends of the heat spreaders 902 away from the denitrification tower 2 are all located in the oil storage tank 901, and the bottom of the heat exchange box 903 is connected to the bottom inner wall of the mixing tank 3 by bolts, and the bottom of the oil storage tank 901 is provided with a circular opening, and the circular opening is connected with an oil injection pipe 904 by bolts, and the oil injection pipe 904 is away from the oil storage tank 9 One end of the oil tank 901 passes through the mixing tank 3 and is connected to the heat exchange box 903; a narrow opening is provided on the heat exchange box 903, and a return pipe 905 is connected to the inner wall of the narrow opening by bolts, and the end of the return pipe 905 away from the heat exchange box 903 is connected to the upper side of the oil storage tank 901 by a flange, and a pump 906 is connected to the upper side of the oil storage tank 901 by bolts, and the output end of the pump 906 is connected to the return pipe 905 through a round pipe, and the outside of the mixing tank 3 is connected to an external frame 907 by bolts; A hole groove is opened on the external frame 907, and a shaft rod is rotatably connected in the hole groove through a bearing. The bottom of the shaft rod is connected to a stirring paddle 909 through bolts, and the upper side of the external frame 907 is connected to a second motor 908 through bolts. The output end of the second motor 908 is bolted to the upper side of the shaft rod through a coupling. A plurality of equidistantly distributed cooling fins 910 are arranged on the outside of the heat exchange box 903.

[0022] Specifically, in the process of the powder conveying pipe 14 conveying the limestone powder to the mixing tank 3 and mixing it with water, the heat spreader 902 transfers the waste heat of the flue gas in the denitrification tower 2 to the heat transfer oil in the oil storage tank 901, and the pump 906 is started. The pump 906 pumps the cold oil in the heat exchange box 903 into the oil storage tank 901 through the reflux pipe 905, so that the hot oil in the oil storage tank 901 is conveyed into the heat exchange box 903 through the oil filling pipe 904, and the heat of the hot oil is transferred to the liquid in the mixing tank 3 through the cooling fins 910 and the surface of the heat exchange box 903, so that the water in the mixing tank 3 can dissolve more limestone powder, and the motor 908 is started. The motor 908 drives the stirring paddle 909 to rotate and stir the liquid in the mixing tank 3, and the stirred emulsion is conveyed to the spray pipe 11 through the infusion pipe 12.

[0023] In specific application scenarios, the waste heat recycling module 9 is mainly suitable for the waste heat recycling link in the waste heat recycling process, that is, the waste heat recycling module 9 uses the heat spreader 902 and the heat exchange box 903 to enable the device to reuse the waste heat of the flue gas in the denitrification tower 2, so that the liquid temperature in the mixing tank 3 is increased, thereby increasing the solubility of limestone, further improving the desulfurization effect of the device and reducing energy consumption.

[0024] Working principle: The flue gas enters the denitrification tower 2 through the smoke conveying pipe 6, and the ammonia water is sprayed out through the spray pipe 5 and contacts with the flue gas. Under the action of the catalyst, the nitrogen oxides in the flue gas are decomposed into nitrogen and water. The remaining flue gas enters the desulfurization tower 1 through the conveying pipe 7. The pump 3 15 pumps the limestone powder in the powder tank 4 into the mixing tank 3 and mixes it with the water conveyed by the water conveying pipe 16 to form a limestone emulsion, which is pumped into the spray pipe 2 11 through the infusion pipe 12 by the pump 2 13 and sprayed into the flue gas in the desulfurization tower 1. In the process of the powder conveying pipe 14 conveying the limestone powder to the mixing tank 3 and mixing it with water, the heat spreader 902 transfers the waste heat of the flue gas in the denitrification tower 2 to the heat transfer oil in the oil storage tank 901, and starts the pump 1 906. The pump 1 906 passes the reflux pipe 905 to The cold oil in the heat exchange box 903 is pumped into the oil storage tank 901, so that the hot oil in the oil storage tank 901 is transported into the heat exchange box 903 through the oil injection pipe 904. The heat of the hot oil is transferred to the liquid in the mixing tank 3 through the heat dissipation fins 910 and the surface of the heat exchange box 903, so that the water in the mixing tank 3 can dissolve more limestone powder, and the second motor 908 is started. The second motor 908 drives the stirring paddle 909 to rotate and stir the liquid in the mixing tank 3. The stirred emulsion is transported to the second spray pipe 11 through the infusion pipe 12. The emulsion reacts with the sulfide in the flue gas to form calcium sulfite, a part of which falls to the bottom of the desulfurization tower 1, and a part adheres to the inner wall of the desulfurization tower 1. The fan 17 transports oxidizing air into the desulfurization tower 1 to react the calcium sulfite into calcium sulfate; After saturation, calcium sulfite crystals are precipitated. When calcium sulfate crystals exist on the inner wall of the desulfurization tower 1, the hydraulic rod 817 and the motor 819 are started. The motor 819 drives the gear 820 to rotate, so that the motor 819 meshing with the inner gear ring 821 drives the connecting plate 818 to rotate on the mounting inner ring 802 and the mounting outer ring 803. The output end of the hydraulic rod 817 is extended and provides a downward force to the embedded ring 824, so that the protrusion 825 on the embedded ring 824 moves in the thread groove 823, so that the embedded ring 824 drives the annular crushing disk 826 to move downward during rotation, and the calcium sulfate crystals attached to the inner wall of the desulfurization tower 1 are broken. Crushing and cleaning, when the crystallization processing module 8 needs to be disassembled, the shift block 814 is moved to rotate the shift block 814 180 degrees on the horizontal groove 815 with a stable axis 808 as the axis, so that the inclined surfaces on the inclined surface block 1 809 and the inclined surface block 2 810 are parallel, and under the elastic force of the spring 811, the two inclined surfaces fit together when the inclined surface block 2 810 descends, and the descending inclined surface block 2 810 drives the U-shaped frame 812 to move downward, thereby pulling the pin 813 out of the insertion hole 806, rotating and installing the inner ring 802, and turning the connecting piece 805 out of the fixed frame 801, and the sediment at the bottom of the desulfurization tower 1 is discharged through the drain pipe 18, and the harmless flue gas is discharged through the exhaust pipe 10.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A packed tower for flue gas desulfurization and denitrification, comprising a desulfurization tower (1), characterized in that: The desulfurization tower (1) is provided with a denitrification tower (2) and a mixing pool (3) outside the desulfurization tower (1), and a delivery pipe (7) and a smoke exhaust pipe (10) are provided on the desulfurization tower (1), one end of the delivery pipe (7) away from the desulfurization tower (1) is connected to the denitrification tower (2), a plurality of spray pipes (5) distributed equidistantly are provided on the denitrification tower (2), a smoke delivery pipe (6) is provided on the side of the denitrification tower (2) away from the desulfurization tower (1), a spray pipe (11) is provided on the desulfurization tower (1), a crystallization treatment module (8) is provided below the spray pipe (11), a waste heat recycling module (9) is provided on the mixing pool (3), and a liquid infusion pipe (12) is provided on the spray pipe (11), and one end of the liquid infusion pipe (12) away from the spray pipe (11) is connected to the mixing pool (3); The crystallization processing module (8) comprises an inner mounting ring (802), an outer mounting ring (803) is arranged outside the inner mounting ring (802), and an outer covering ring (822) is fixedly connected to the bottom of the outer mounting ring (803); The waste heat recycling module (9) comprises a heat exchange box (903) and an oil storage tank (901).

2. A packed tower for flue gas desulfurization and denitrification according to claim 1, characterized in that: The inner wall of the outer ring (822) is provided with an inner ring (824), the bottom of the inner ring (824) is fixedly connected to an annular crushing disk (826), a plurality of hydraulic rods (817) equidistantly distributed around the circumference are provided between the inner ring (802) and the outer ring (803), the output ends of the hydraulic rods (817) are fixedly connected to the upper side of the inner ring (824), and the outsides of the hydraulic rods (817) are fixedly connected to connecting plates (818), and the bottoms of the connecting plates (818) are slidably connected to the upper sides of the inner ring (802) and the outer ring (803).

3. A packed tower for flue gas desulfurization and denitrification according to claim 1, characterized in that: The upper sides of the plurality of connecting plates (818) are all fixedly connected to motor one (819), the output ends of the motor one (819) are all connected to gears (820) via couplings, the upper side of the outer ring (803) is fixedly connected to an inner gear ring (821), the plurality of gears (820) are all meshed with the inner gear ring (821), the upper side of the inner ring (802) is fixedly connected to a plurality of connecting frames (804), the connecting frames (804) are far away from the inner ring (802) One end of each of the two gears is fixedly connected to the outside of the inner gear ring (821), and a second pump (13) is arranged outside the mixing tank (3), and the output end of the second pump (13) is connected to the liquid infusion tube (12) via a thin tube. A powder tank (4) is arranged outside the mixing tank (3), and a powder infusion tube (14) is connected to the bottom of the powder tank (4) via a flange. The end of the powder infusion tube (14) away from the powder tank (4) is located inside the mixing tank (3), and a water infusion tube (16) is arranged on the mixing tank (3).

4. A packed tower for flue gas desulfurization and denitrification according to claim 1, characterized in that: The inner wall of the outer ring (822) is provided with a threaded groove (823), the outer part of the inner ring (824) is fixedly connected with two protrusions (825), the outer parts of the protrusions (825) are slidably connected with the inner wall of the threaded groove (823), and a pump (15) is arranged outside the powder tank (4), the output end of the pump (15) is connected to the powder conveying pipe (14) through a conduit, and a fan (17) is arranged outside the desulfurization tower (1), the output end of the fan (17) is connected to the desulfurization tower (1) through an air duct, and a circular hole is provided on the desulfurization tower (1), and a drainage pipe (18) is fixedly connected to the inner wall of the circular hole.

5. A packed tower for flue gas desulfurization and denitrification according to claim 4, characterized in that: The inner wall of the desulfurization tower (1) is fixedly connected to four circumferentially equidistantly distributed fixed frames (801), the fixed frames (801) are slidably connected with connecting pieces (805), the bottoms of the four connecting pieces (805) are fixedly connected to the upper side of the mounting inner ring (802), and the bottoms of the fixed frames (801) and the outsides of the connecting pieces (805) are provided with insertion holes (806), and the upper sides of the four fixed frames (801) are fixedly connected to isolation frames (807).

6. A packed tower for flue gas desulfurization and denitrification according to claim 5, characterized in that: The upper sides of the four fixed frames (801) are all fixedly connected to stabilizing shafts (808), the upper sides of the stabilizing shafts (808) are all fixedly connected to the top inner walls of the isolation frames (807) on the same side, the outsides of the stabilizing shafts (808) are all slidably connected to symmetrical inclined plane blocks 1 (809) and 2 (810), and the outsides of the stabilizing shafts (808) are all surrounded by springs (811), one end of the springs (811) is in contact with the top inner wall of the isolation frames (807) on the same side, and the other end is in contact with the upper side of the inclined plane block 2 (810) on the same side.

7. A packed tower for flue gas desulfurization and denitrification according to claim 6, characterized in that: The four isolation frames (807) are each provided with a transverse groove (815), a shifting block (814) is slidably connected in the transverse groove (815), and the shifting block (814) is fixedly connected to the side opposite to the inclined surface block 1 (809) on the same side. The isolation frames (807) are each provided with a vertical groove (816), and the vertical groove (816) is connected to the transverse groove (815) on the same side. A U-shaped frame (812) is slidably connected in the vertical groove (816), and one end of the U-shaped frame (812) is fixedly connected to the outside of the inclined surface block 2 (810) on the same side, and the other end is fixedly connected to a latch (813), and the outside of the latch (813) is plugged into the insertion hole (806) on the same side.

8. A packed tower for flue gas desulfurization and denitrification according to claim 1, characterized in that: The oil storage tank (901) is fixedly connected to a side opposite to the denitrification tower (2); a plurality of equally spaced soaking plates (902) are provided on the denitrification tower (2); the ends of the soaking plates (902) away from the denitrification tower (2) are all located in the oil storage tank (901); the bottom of the heat exchange box (903) is fixedly connected to the bottom inner wall of the mixing tank (3); a circular opening is provided at the bottom of the oil storage tank (901); an oil injection pipe (904) is fixedly connected to the circular opening; the end of the oil injection pipe (904) away from the oil storage tank (901) passes through the mixing tank (3) and is connected to the heat exchange box (903).

9. A packed tower for flue gas desulfurization and denitrification according to claim 8, characterized in that: The heat exchange box (903) is provided with a narrow opening, and a return pipe (905) is fixedly connected to the inner wall of the narrow opening; one end of the return pipe (905) away from the heat exchange box (903) is connected to the upper side of the oil storage tank (901) via a flange; a pump (906) is fixedly connected to the upper side of the oil storage tank (901); the output end of the pump (906) is connected to the return pipe (905) via a circular tube; and an external frame (907) is fixedly connected to the outside of the mixing tank (3).

10. A packed tower for flue gas desulfurization and denitrification according to claim 9, characterized in that: The external frame (907) is provided with a hole groove, a shaft rod is movably connected in the hole groove, a stirring paddle (909) is fixedly connected to the bottom of the shaft rod, and a second motor (908) is fixedly connected to the upper side of the external frame (907), and the output end of the second motor (908) is fixedly connected to the upper side of the shaft rod via a coupling, and a plurality of equidistantly distributed heat dissipation fins (910) are arranged outside the heat exchange box (903).

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