A system and method for controlling the inlet flue gas temperature of an SCR denitrification device

Abstract

The present application relates to flue gas desulfurization and denitrification technology field, disclose a kind of for controlling the system and method of the entrance smoke temperature of SCR denitrification equipment, including mixing box, mixing and scraping mechanism, air pump and purification tank, mixing box includes heat preservation shell and heat conduction inner shell, heating plate is arranged between heat preservation shell and heat conduction inner shell, heat conduction inner shell is communicated with high-temperature flue gas pipeline and low-temperature flue gas pipeline, and high-temperature flue gas pipeline and low-temperature flue gas pipeline extend to the outside of heat preservation shell;Mixing and scraping mechanism is set to mixing box, for the high-temperature and low-temperature flue gas in mixing box is stirred and mixed and is scraped to the dust in the inner wall of mixing box;The bottom of mixing box is also communicated with ash chute, and the outlet of ash chute is provided with storage mechanism;The inlet of air pump is communicated with the inner cavity of mixing box by smoke pipe, and the output end of air pump is communicated with the inlet of purification tank by smoke pipe.The present application can control the entrance smoke temperature of SCR denitrification equipment to reach preset requirement, while also can purify flue gas, guarantee the service life of SCR denitrification equipment.

Description

Technical Field

[0001] This invention relates to the field of flue gas desulfurization and denitrification technology, specifically to a system and method for controlling the inlet flue gas temperature of an SCR denitrification device. Background Technology

[0002] Flue gas desulfurization and denitrification technology is a boiler flue gas purification technology applied to the chemical industry that generates nitrogen oxides and sulfur oxides. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution, so the application of this technology has many benefits for environmental air purification. Known flue gas desulfurization and denitrification technologies include PAFP, ACFP, soft manganese ore method, electron beam ammonia method, pulse corona method, gypsum wet method, catalytic oxidation method, and microbial degradation method.

[0003] However, under the deep peak shaving operation mode, the generator set often needs to maintain a low load condition for a long time. Under this condition, the inlet flue gas temperature of the SCR (Selective Catalytic Reduction) denitrification equipment will drop significantly to the range of 260-300℃. This temperature is far lower than the range of 320-400℃ required for the traditional denitrification catalyst to perform normally. The reduction in flue gas temperature will directly lead to a series of problems such as weakened denitrification catalyst activity, easy crystallization of reducing agent, and corrosion risk of air preheater, which will seriously affect the denitrification effect and overall operational stability of the unit. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a system and method for controlling the inlet flue gas temperature of an SCR denitrification device. The technical solution of the present invention solves the problem mentioned in the background art where the inlet flue gas temperature of the denitrification device drops significantly to the range of 260-300°C. This temperature is far lower than the 320-400°C range required for traditional denitrification catalysts to function properly. The decrease in flue gas temperature will directly lead to a series of problems such as weakened denitrification catalyst activity, easy crystallization of reducing agent, and corrosion risk of air preheater.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A system for controlling the inlet flue gas temperature of an SCR denitrification equipment includes a mixing chamber, a mixing and scraping mechanism, an air pump, and a purification chamber. The mixing chamber includes an insulating outer shell and a heat-conducting inner shell. A heating plate is provided between the insulating outer shell and the heat-conducting inner shell. A high-temperature flue pipe and a low-temperature flue pipe are connected to the heat-conducting inner shell. The high-temperature flue pipe and the low-temperature flue pipe extend to the outside of the insulating outer shell.

[0007] The mixing and scraping mechanism is installed in the mixing chamber. The mixing and scraping mechanism is used to stir and mix the high-temperature and low-temperature flue gas in the mixing chamber and to scrape the dust on the inner wall of the mixing chamber.

[0008] The bottom of the mixing box is also connected to an ash hopper, and the outlet of the ash hopper is equipped with a storage mechanism.

[0009] The air pump inlet is connected to the inner cavity of the mixing chamber through the smoke extraction pipe, and the air pump output is connected to the inlet of the purification chamber through the smoke outlet pipe.

[0010] Preferably, the top of the mixing chamber is fixed with a fastener, which includes a bearing plate and an L-shaped load plate. The L-shaped load plate is welded to the top of the bearing plate. The mixing and scraping mechanism is disposed on the outer surface of the L-shaped load plate and the bearing plate. The mixing and scraping mechanism includes a drive motor fixedly installed on the top of the L-shaped load plate. The output end of the drive motor extends to the lower side of the L-shaped load plate and is connected to a gear. A worm gear is coaxially connected to the lower side of the gear. The bearing plate is also provided with a support member, which is rotatably connected to the lower end of the worm gear. A worm wheel is meshed with the outer circumferential surface of the worm gear. The worm wheel is rotatably connected to the bearing plate through a pin. A fixing rod is fixedly connected to the shaft of the worm wheel. A connecting rod is rotatably connected to the other end of the fixing rod. The connecting rod is located away from the bearing plate. One end of the fixed rod is rotatably connected to the fixed rod 2, and the other end of the fixed rod 2 is fixedly connected to the shaft of the worm gear 2. The shaft of the worm gear 2 is rotatably connected to the bearing plate. The outer circumferential surface of the gear 1 is meshed with the gear 2. The gear 2 has a sliding groove 1 on its coaxial axis. The sliding rod 2 is slidably connected inside the sliding groove 1. The bottom of the sliding rod 2 is fixedly connected to the worm gear 2. The worm gear 2 is meshed with the worm gear 2. The bottom of the worm gear 2 is fixedly connected to the connecting rod. The connecting rod extends into the interior of the heat-conducting inner shell. Stirring blades with opposite inclination angles are fixedly connected to opposite sides of the outer circumferential surface of the connecting rod. The bottom of the connecting rod is coaxially fixedly connected to a cross-shaped connector. Scrapers are fixedly connected to all four ends of the connector. The scrapers abut against the inner wall of the heat-conducting inner shell.

[0011] Preferably, the storage mechanism includes a fixed frame fixedly connected to the bottom of the ash hopper. The top of the fixed frame has a through groove adapted to the ash hopper. Connecting plates are fixedly connected to opposite sides of the outer surface of the fixed frame by bolts. The outer surface of the connecting plates on both sides has a slot. A feeding box is provided on the lower side of the fixed frame. Fixed blocks are fixedly connected to opposite sides of the outer surface of the feeding box. Rotating columns are rotatably connected to the outer sides of the fixed blocks on both sides. Rotating plates are fixedly connected to the outer circumference of the rotating columns. A locking rod is fixedly connected to the outer side of the rotating plates. Rotating plates are also fixedly connected to the outer circumference of the rotating columns. Handles are fixedly connected between the ends of the rotating plates away from the rotating columns on both sides. Wheels are provided at the four corners of the bottom of the feeding box.

[0012] Preferably, the exhaust pipe extends into the interior of the purification chamber and communicates with the filter frame. A locking mechanism is provided at the communication position between the exhaust pipe and the filter frame. Several sets of through grooves are linearly opened on the outer surface of the filter frame. A connecting pipe is welded to the inlet of the filter frame. The locking mechanism includes three sets of fixing blocks 2 circumferentially and equidistantly connected to the outer circumferential surface of the exhaust pipe. Through grooves 3 are opened on the outer surface of each of the three sets of fixing blocks 2. Three sets of fixing blocks 3 are also circumferentially and equidistantly connected to the outer circumferential surface of the connecting pipe 1. Through grooves 4 are opened on the outer surface of the three sets of fixing blocks 3. Fixing blocks 4 are also fixedly connected to the outer circumferential surface of the exhaust pipe. Hinges are fixedly installed on opposite sides of the outer surface of the fixing blocks 4. Rotating component 1 and rotating component 2 are rotatably connected inside the hinges on both sides, respectively.

[0013] Preferably: a through groove five is provided inside the end of the rotating component one away from the hinge frame, and sliding grooves two are provided opposite to the through groove five inside the rotating component one. A spring is provided inside the through groove five, one end of the spring is fixedly connected to the inner wall of the rotating component one, and the other end of the spring is fixedly connected to a slider two. The slider two slides inside the through groove five through the sliding grooves two on both sides. A telescopic component is fixedly connected to the end of the slider two away from the spring, and a locking rod two is fixedly connected to the top of the end of the telescopic component away from the slider two. A handle is provided on the outer surface of the locking rod two. A locking groove two that matches the telescopic component and the locking rod two is provided on the outer surface of the end of the rotating component two away from the hinge frame.

[0014] Preferably, the purification box is fixedly connected to an installation plate, and the outer surface of the installation plate is provided with a vibration mechanism. The vibration mechanism includes a second drive motor fixedly installed on the installation plate. The output end of the second drive motor passes through the installation plate and is fixedly connected to a turntable. A rotating rod is also rotatably connected to the installation plate. A rotating strip is rotatably connected to the outer circumference of the rotating rod. The lower end of the rotating rod is connected to the rotating strip. A groove three is opened on the upper side of the rotating rod on the rotating strip. A fixed rod three is eccentrically rotatably connected to the turntable. The fixed rod three extends into the interior of the groove three and is slidably connected to the groove three.

[0015] A fan-shaped toothed plate is fixedly connected to the lower end of the rotating strip. A sliding groove four is provided on the upper part of the mounting plate and the purification box. A sliding member is slidably connected inside the sliding groove four. Several sets of toothed bars are linearly distributed on the top of the sliding member. The fan-shaped toothed plate is engaged with the sliding member through several sets of toothed bars. A striking member for striking the filter frame is fixedly connected to one end of the sliding member that enters the purification box.

[0016] Preferably, both the high-temperature flue and the low-temperature flue are equipped with electromagnetic valves.

[0017] Preferably, the purification box is equipped with a cabinet door, and the outlet side of the purification box is connected to a connecting pipe.

[0018] Preferably, the top of the mixing chamber is also provided with a temperature detector for detecting the uniform temperature inside the heat-conducting inner shell.

[0019] The present invention also provides a method for controlling the inlet flue gas temperature of an SCR denitrification device, the method being carried out through the system for controlling the inlet flue gas temperature of an SCR denitrification device as described above, comprising:

[0020] The high-temperature flue gas duct and the low-temperature flue gas duct are connected to the thermal power plant and the economizer duct, respectively. When the flue gas temperature discharged from the low-temperature flue gas duct is not up to standard, high-temperature flue gas is drawn from the duct connected to the thermal power plant through the high-temperature flue gas duct. The high-temperature flue gas and the low-temperature flue gas are mixed in the mixing box to increase the flue gas temperature. At the same time, the heating plate is turned on, and the heating plate heats the flue gas inside the mixing box through the heat-conducting inner shell. Simultaneously, the mixing and scraping mechanism is activated to mix the high-temperature flue gas and the low-temperature flue gas in the mixing box. At the same time, the mixing and scraping mechanism scrapes and removes ash from the inner wall of the mixing box. The removed ash is collected in the ash hopper and stored in the storage mechanism. When the temperature in the mixing box reaches the temperature required by the SCR reactor, the air pump is started to discharge the flue gas in the mixing box into the purification box for filtration to obtain purified flue gas. The purified flue gas in the purification box is then sent to the SCR reactor for reaction.

[0021] The present invention has the following beneficial effects:

[0022] This invention relates to a system for controlling the inlet flue gas temperature of an SCR denitrification equipment. Through the design of a mixing chamber, when the flue gas temperature discharged from the low-temperature flue duct is insufficient, flue gas can be drawn from the high-temperature flue duct for neutralization. Simultaneously, a heating plate is activated for auxiliary heating, ensuring the flue gas temperature meets subsequent treatment requirements. The invention utilizes a mixing and scraping mechanism to fully disperse and blend the flue gas within the mixing chamber, effectively preventing overheating or uneven heating. Furthermore, the design cleverly employs connecting rods and scraper structures to reciprocate and scrape dust from the inner wall of the mixing chamber, effectively collecting and cleaning the dust, thus improving the practicality and ease of maintenance of the device. The invention also features a storage mechanism that allows users to easily clean accumulated dust. With simple operation, the discharge box can be easily unlocked from the bottom of the ash hopper and moved to a designated location for emptying, greatly simplifying the dust handling process.

[0023] Furthermore, the present invention provides a locking mechanism at the connection point between the flue and the filter frame. The design of the locking mechanism can significantly improve the dust filtration effect in the flue gas, ensuring that the emitted flue gas meets environmental protection standards. At the same time, the quick-replacement design of the filter frame makes maintenance work more convenient and efficient.

[0024] Furthermore, the present invention includes a vibration mechanism in the purification chamber. Through the design of the vibration mechanism, the continuous striking of its striking parts can effectively prevent dust from clogging the filter frame, ensuring that the flue gas can be smoothly discharged from the filter frame, thereby ensuring the continuous and stable operation of the entire device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the system for controlling the inlet flue gas temperature of the SCR denitrification equipment in an embodiment of the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of the internal three-dimensional structure of the mixing tank in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of some of the mixing and scraping mechanisms in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a portion of the mixing and scraping mechanism in an embodiment of the present invention.

[0029] Figure 5 This is a three-dimensional structural diagram of the mixing and scraping mechanism in other parts of the present invention.

[0030] Figure 6 This is a three-dimensional structural diagram of the remaining mixing and scraping mechanism in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the storage mechanism in an embodiment of the present invention;

[0032] Figure 8 For the present invention Figure 7 Enlarged view of a portion of point A in the middle;

[0033] Figure 9 This is a schematic cross-sectional view of the internal three-dimensional structure of the purification box in an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the three-dimensional structure of the locking mechanism in an embodiment of the present invention;

[0035] Figure 11 This is a three-dimensional structural diagram of the locking mechanism in an embodiment of the present invention;

[0036] Figure 12 This is a three-dimensional structural diagram of a rotating component in an embodiment of the present invention;

[0037] Figure 13 For the present invention Figure 11 Enlarged view of a portion of point B in the middle;

[0038] Figure 14 For the present invention Figure 11Enlarged view of a portion of point C in the middle;

[0039] Figure 15 For the present invention Figure 11 Enlarged view of a portion of point D;

[0040] Figure 16 This is a schematic diagram of the three-dimensional structure of the vibration mechanism installation in an embodiment of the present invention;

[0041] Figure 17 This is a schematic diagram of the three-dimensional structure of some vibration mechanisms in an embodiment of the present invention;

[0042] Figure 18 This is a three-dimensional structural diagram of the remaining vibration mechanism in an embodiment of the present invention.

[0043] The numbers on the map are:

[0044] 1. Mixing box; 101. Insulated outer shell; 102. Heat-conducting inner shell; 103. Heating plate; 104. High-temperature flue; 105. Low-temperature flue; 106. Solenoid valve; 107. Ash hopper;

[0045] 2. Fasteners; 201. Load-bearing plate; 202. L-shaped load-bearing plate;

[0046] 3. Mixing and scraping mechanism; 301. Drive motor 1; 302. Gear 1; 303. Support component; 304. Worm 1; 305. Worm wheel 1; 306. Fixed rod 1; 307. Connecting rod; 308. Fixed rod 2; 309. Worm wheel 2; 310. Gear 2; 311. Slide groove 1; 312. Slide rod; 313. Worm 2; 314. Connecting rod; 315. Stirring blade; 316. Connecting component; 317. Scraper.

[0047] 4. Temperature detector;

[0048] 5. Storage mechanism; 501. Fixing frame; 502. Through slot one; 503. Connecting plate; 504. Card slot one; 505. Feed box; 506. Fixing block one; 507. Rotating column; 508. Rotating plate one; 509. Card rod one; 510. Rotating plate two; 511. Handle; 512. Wheel;

[0049] 6. Air pump;

[0050] 7. Cleanroom enclosure; 701. Cabinet door;

[0051] 8. Filter frame; 801. Through groove two; 802. Connecting pipe one;

[0052] 9. Locking mechanism; 901. Fixing block two; 902. Through groove three; 903. Fixing block three; 904. Through groove four; 905. Fixing block four; 906. Hinge frame; 907. Rotating component one; 908. Rotating component two; 909. Through groove five; 910. Slide groove two; 911. Spring; 912. Slider; 913. Telescopic component; 914. Locking rod two; 915. Handle; 916. Locking groove two;

[0053] 10. Mounting plate;

[0054] 11. Vibration mechanism; 1101. Drive motor II; 1102. Turntable; 1103. Rotating rod; 1104. Rotating bar; 1105. Slide groove III; 1106. Fixed rod III; 1107. Sector toothed plate; 1108. Sliding component; 1109. Rack; 1110. Striking component; 1111. Slide groove IV;

[0055] 12. Smoke extraction pipe; 13. Smoke outlet pipe; 14. Connecting pipe 2. Detailed Implementation

[0056] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0057] Please refer to Figures 1 to 18 As shown, this embodiment describes a system for controlling the inlet flue gas temperature of an SCR denitrification equipment. It includes a mixing chamber 1 and a fixing component 2. The mixing chamber 1 includes an insulated outer shell 101 and a heat-conducting inner shell 102. A heating plate 103 is disposed between the insulated outer shell 101 and the heat-conducting inner shell 102. The heat-conducting inner shell 102 is connected to a high-temperature flue gas pipe 104 and a low-temperature flue gas pipe 105. The high-temperature flue gas pipe 104 and the low-temperature flue gas pipe 105 extend to the outside of the insulated outer shell 101. A temperature detector 4 for detecting the internal temperature of the heat-conducting inner shell 102 is also disposed on the top of the mixing chamber 1. Both the high-temperature flue gas pipe 104 and the low-temperature flue gas pipe 105 are equipped with electromagnetic valves 106. The high-temperature flue gas pipe 104 and the low-temperature flue gas pipe 105 are respectively connected to the thermal power plant and the economizer pipes. In operation, the high-temperature flue gas duct 104 and the low-temperature flue gas duct 105 are effectively connected to the thermal power plant and the economizer duct, respectively. When the temperature detector 4 detects that the flue gas temperature discharged from the low-temperature flue gas duct 105 is not up to standard, the high-temperature flue gas duct 104 is controlled by the solenoid valve 106 to draw flue gas from the duct connected to the thermal power plant, thereby achieving neutralization of the high-temperature and low-temperature flue gas in the mixing box 1 and increasing the flue gas temperature. At the same time, the heating plate 103 is turned on, and the heating plate 103 heats the flue gas inside the mixing box 1 through the heat-conducting inner shell 102. The heat-insulating outer shell 101 prevents the flue gas from escaping, further improving the efficiency of flue gas heating.

[0058] In this embodiment, see Figures 1-6The fastener 2 is welded to the top of the mixing tank 1. The fastener 2 includes a support plate 201 and an L-shaped load plate 202. The L-shaped load plate 202 is welded to the top of the support plate 201. The outer surfaces of the L-shaped load plate 202 and the support plate 201 are provided with a mixing and scraping mechanism 3. See [link to documentation]. Figures 2-6 The mixing and scraping mechanism 3 includes a drive motor 301 fixedly mounted on the top of the L-shaped load-bearing plate 202. The output end of the drive motor 301 extends to the lower side of the L-shaped load-bearing plate 202 and is fixedly connected to a gear 302. The front side of the load-bearing plate 201 (with...) Figure 3Taking the indicated orientation as an example, the front side (the side perpendicular to the plane and closest to the observer) and the rear side (the opposite side of the front side) are also fixedly connected to a support member 303. A worm gear 304 is rotatably connected to the upper side of the support member 303. The upper end of the worm gear 304 is fixedly connected to the central axis of the gear 302. A worm wheel 305 is meshed with the outer circumferential surface of the worm gear 304. The worm wheel 305 is rotatably connected to the bearing plate 201 via a pin. A fixing rod 306 is fixedly connected to the front side of the worm wheel 305, allowing the worm wheel 305 to rotate synchronously with the fixing rod 306. A connecting rod 307 is rotatably connected to the other end of the fixing rod 306. A fixing rod 308 is rotatably connected to the end of the connecting rod 307 away from the fixing rod 306. A worm wheel 309 is fixedly connected to the rear side of the other end of the fixing rod 308, allowing the fixing rod 308 to rotate synchronously with the worm wheel 309. The worm wheel 309 is connected to the bearing plate 201. 01 Rotary connection, gear 310 is meshed with the outer circumferential surface of gear 1 302, gear 2 310 has a sliding groove 311 in the center, sliding rod 312 is slidably connected inside the sliding groove 311, worm gear 313 is fixedly connected to the bottom of sliding rod 312, worm gear 313 meshes with worm wheel 309, connecting rod 314 is fixedly connected to the bottom of worm gear 313, connecting rod 314 extends into the interior of heat-conducting inner shell 102, and stirring blades 315 with opposite inclination angles are fixedly connected to the opposite sides of the outer circumferential surface of connecting rod 314, cross-shaped connector 316 is coaxially fixedly connected to the bottom of connecting rod 314, scraper 317 is fixedly connected to all four ends of connector 316, scraper 317 abuts against the inner wall of heat-conducting inner shell 102, and ash hopper 107 is also connected to the bottom of mixing box 1, storage mechanism 5 is provided at the end of ash hopper 107 away from mixing box 1. In this embodiment, to avoid overheating or uneven heating of the flue gas in the mixing chamber 1, drive motor 301 is activated. Drive motor 301 drives gear 302 to rotate, causing worm gear 304 to rotate. The rotation of worm gear 304 drives worm wheel 305 to rotate. Worm wheel 305, through the cooperation of fixed rod 306, connecting rod 307, and fixed rod 308, drives worm wheel 309 to rotate. Worm wheel 309 then drives worm gear 313 to rise and fall. It is worth noting that when gear 302 rotates, it also drives the meshing gear 310 to rotate. Gear 310 drives the sliding rod. When the second worm gear 312 rotates, the second worm gear 313 rotates, causing the second slide rod 312 to slide inside the first slide groove 311. At this time, the connecting rod 314 will rotate back and forth, and then the flue gas in the mixing box 1 will be dispersed by the stirring blades 315 with opposite inclination angles on both sides, so as to achieve full mixing. During the dispersion process, the dust in the flue gas will adhere to the inner wall of the mixing box 1. At this time, the connecting rod 314 drives the scraper 317 through the connecting piece 316 to scrape the dust on the inner wall of the mixing box 1 back and forth, so that the dust enters the storage mechanism 5 through the ash hopper 107, further improving the practicality of the device.

[0059] See Figure 7 and Figure 8 In this embodiment, the storage mechanism 5 includes a fixed frame 501 fixedly connected to the bottom of the ash hopper 107. The top of the fixed frame 501 has a through groove 502 adapted to the ash hopper 107. Connecting plates 503 are fixedly connected to opposite sides of the outer surface of the fixed frame 501 by bolts. Each connecting plate 503 has a slot 504 on its outer surface. A feeding box 505 is provided on the lower side of the fixed frame 501. The opposite sides of the outer surface of the feeding box 505 are fixedly connected to... Fixed block 506, rotating column 507 is rotatably connected to the outer side of both fixed blocks 506, rotating plate 508 is fixedly connected to the outer circumference of rotating column 507, locking rod 509 is fixedly connected to the outer side of rotating plate 508, rotating plate 510 is also fixedly connected to the outer circumference of rotating column 507, handle 511 is fixedly connected between the ends of rotating plate 510 on both sides away from rotating column 507, and wheels 512 are provided at the four corners of the bottom of the feeding box 505. In this embodiment, dust enters the interior of the discharge box 505 through the dust collection hopper 107 and the through slot 502. When it is necessary to clean the dust in the discharge box 505, the user first holds the handle 511 and pushes it upward. The rotating plates 510 on both sides will drive the rotating column 507 to rotate, which in turn drives the rotating plate 508 to rotate. The rotating plate 508 then drives the locking rod 509 to rotate until the rotating column 507 and the locking rod 509 rotate to the same horizontal plane. At this time, the handle 511 can be pulled outward to move the rotating column 507 and the locking rod 509 away from the locking slot 504. Then the discharge box 505 falls and the dust is moved by the wheels 512 and poured into the designated location. Similarly, when it is necessary to lock the discharge box 505 at the bottom of the dust collection hopper 107, simply insert the rotating column 507 and the locking rod 509 parallel into the locking slot 504, and then press down the handle 511 to lock the discharge box 505 into the locking slot 504.

[0060] See Figure 1 , Figures 9-15In this embodiment, the outer surface of the mixing box 1 is connected to a smoke extraction pipe 12. The other end of the smoke extraction pipe 12 is connected to the input end of the air pump 6. The output end of the air pump 6 is connected to a smoke outlet pipe 13. The end of the smoke outlet pipe 13 away from the air pump 6 is connected to a purification box 7, and the smoke outlet pipe 13 extends into the interior of the purification box 7 and is connected to a filter frame 8. A locking mechanism 9 is provided at the connection position between the smoke outlet pipe 13 and the filter frame 8. Several sets of through grooves 801 are linearly opened on the outer surface of the filter frame 8. A connecting pipe 8 is welded to the left end of the filter frame 8. 02. The locking mechanism 9 includes three sets of fixing blocks 901 circumferentially and equidistantly connected to the outer circumferential surface of the smoke outlet pipe 13. Each of the three sets of fixing blocks 901 has a through groove 902 on its outer surface. The outer circumferential surface of the connecting pipe 802 is also circumferentially and equidistantly connected to three sets of fixing blocks 903. Each of the three sets of fixing blocks 903 has a through groove 904 on its outer surface. A fixing block 905 is also fixedly connected to the outer circumferential surface of the smoke outlet pipe 13. Hinges 906 are fixedly installed on opposite sides of the outer surface of the fixing block 905. The hinge frame 906 has two rotating parts rotatably connected inside: a first rotating part 907 and a second rotating part 908. The first rotating part 907 has a through groove 909 at its end away from the hinge frame 906. Opposite to the first rotating part 907, each through groove 909 has a sliding groove 910. A spring 911 is installed inside the through groove 909. One end of the spring 911 is fixedly connected to the inner wall of the first rotating part 907, and the other end of the spring 911 is fixedly connected to a second slider 912. The second slider 912... The slide block 912 slides inside the through groove 909 via the two side slide grooves 910. The end of the slider 912 away from the spring 911 is fixedly connected to the telescopic component 913. The top of the telescopic component 913 away from the slider 912 is fixedly connected to the locking rod 914. The outer surface of the locking rod 914 is provided with a handle 915. The outer surface of the rotating component 908 away from the hinge frame 906 is provided with a locking groove 916 that matches the telescopic component 913 and the locking rod 914. The front side of the purification box 7 is provided with a cabinet door 701.In this embodiment, when the temperature detector 4 detects that the low-temperature and high-temperature flue gas have fully mixed and reached the temperature required by the SCR reactor, the air pump 6 is started. The air pump 6 discharges the flue gas into the purification chamber 7 through the flue pipe 13. The flue gas enters the interior of the filter frame 8, and the deep channel 801 prevents dust from overflowing, allowing the deeply filtered flue gas to be discharged to the outside of the filter frame 8, further improving the filtration effect of dust in the flue gas. When the filter frame 8 needs to be replaced, simply open the cabinet door 701, then grasp the handle 915 and... When the rotating part 2 slides in the direction of 908, the telescopic part 913 will compress the spring 911 through the slider 2 912 and slide into the interior of the through groove 5 909 along the slide groove 2 910, so that the locking rod 2 914 and the handle 915 are away from the locking groove 2 916. Then, through the hinge brackets 906 on both sides of the fixing block 4 905 and rotating parts 1 907 and 2 908 are rotated, so that rotating parts 1 907 and 2 908 are disengaged from the through groove 3 902 and the through groove 4 904, and the filter frame 8 can be quickly removed, so as to quickly replace the filter frame 8.

[0061] See Figure 1 , Figures 16-18In this embodiment, a connecting pipe 14 is connected to the right side of the purification box 7. A mounting plate 10 is fixedly connected to the right side of the purification box 7. A vibration mechanism 11 is provided on the outer surface of the mounting plate 10. The vibration mechanism 11 includes a drive motor 1101 fixedly mounted on the outside of the mounting plate 10. The output end of the drive motor 1101 extends to the outside of the mounting plate 10 and is coaxially fixedly connected to a turntable 1102. A rotating rod 1103 is rotatably connected to the outside of the mounting plate 10 below the turntable 1102. A rotating strip 1104 is rotatably connected to the outer circumferential surface of the rotating rod 1103. A sliding groove 3 is provided on the rotating strip 1104 above the rotating rod 1103. 1105, a fixed rod 1106 is slidably connected inside the slide groove 1105. The fixed rod 1106 is eccentrically rotatably connected to the outer surface of the turntable 1102. A fan-shaped toothed plate 1107 is fixedly connected to the bottom of the rotating plate 1104. Slide grooves 1111 are opened on the outer surfaces of the mounting plate 10 and the purification box 7. A sliding member 1108 is slidably connected inside the slide groove 1111. Several sets of racks 1109 are linearly distributed on the top of the sliding member 1108. The fan-shaped toothed plate 1107 is meshed with the sliding member 1108 through several sets of racks 1109. A striking member 1110 is fixedly connected to one end of the sliding member 1108 that enters the purification box 7. In this embodiment, when there is a lot of dust in the filter frame 8 and the device is still running and the filter frame 8 cannot be replaced quickly, in order to prevent the dust in the flue gas from clogging the second channel 801 and causing the flue gas to be unable to be discharged from the filter frame 8, the second drive motor 1101 is first turned on. The second drive motor 1101 drives the turntable 1102 to rotate, which in turn drives the fixed rod 1106 to rotate eccentrically. With the cooperation of the rotating rod 1103, the fixed rod 1106 slides in the third slide groove 1105, which drives the fan-shaped toothed plate 1107 to rotate back and forth. Through the several sets of racks 1109 set on the top of the sliding member 1108, the sliding member 1108 slides in the fourth slide groove 1111, thereby driving the striking member 1110 to continuously strike the outer surface of the filter frame 8 back and forth, effectively preventing the problem of dust clogging the second channel 801. The flue gas discharged from the outside of the filter frame 8 will enter the interior of the SCR reactor through the second connecting pipe 14, effectively avoiding the problem of excessively low flue gas temperature or excessive dust.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A system for controlling the inlet flue gas temperature of an SCR denitrification device, characterized in that: The system includes a mixing chamber (1), a mixing and scraping mechanism (3), an air pump (6), and a purification chamber (7). The mixing chamber (1) includes an insulated outer shell (101) and a heat-conducting inner shell (102). A heating plate (103) is provided between the insulated outer shell (101) and the heat-conducting inner shell (102). A high-temperature smoke pipe (104) and a low-temperature smoke pipe (105) are connected to the heat-conducting inner shell (102). The high-temperature smoke pipe (104) and the low-temperature smoke pipe (105) extend to the outside of the insulated outer shell (101). The mixing and scraping mechanism (3) is installed in the mixing box (1). The mixing and scraping mechanism (3) is used to stir and mix the high temperature and low temperature flue gas in the mixing box (1) and to scrape the dust on the inner wall of the mixing box (1). The bottom of the mixing box (1) is also connected to an ash hopper (107), and the outlet of the ash hopper (107) is provided with a storage mechanism (5). The inlet of the air pump (6) is connected to the inner cavity of the mixing box (1) through the smoke extraction pipe (12), and the output end of the air pump (6) is connected to the inlet of the purification box (7) through the smoke outlet pipe (13). The exhaust pipe (13) extends into the interior of the purification box (7) and communicates with the filter frame (8). A locking mechanism (9) is provided at the communication position between the exhaust pipe (13) and the filter frame (8). Several sets of through slots (801) are linearly opened on the outer surface of the filter frame (8). A connecting pipe (802) is welded to the inlet of the filter frame (8). The locking mechanism (9) includes three sets of fixing blocks (901) circumferentially and equidistantly connected to the outer circumferential surface of the exhaust pipe (13). The outer surfaces of the three sets of fixing blocks (901) are all opened with There is a through groove three (902), and three sets of fixing blocks three (903) are also circumferentially and equidistantly connected on the outer circumference of the connecting pipe one (802). The outer surface of the three sets of fixing blocks three (903) is provided with a through groove four (904). The outer circumference of the smoke outlet pipe (13) is also fixedly connected with a fixing block four (905). The opposite sides of the outer surface of the fixing block four (905) are fixedly installed with hinge frames (906). The interior of the hinge frames (906) on both sides is rotatably connected with a rotating part one (907) and a rotating part two (908). The rotating component 1 (907) has a through groove 5 (909) inside the end away from the hinge frame (906). Opposite to the through groove 5 (909) inside the rotating component 1 (907) are sliding grooves 2 (910). A spring (911) is installed inside the through groove 5 (909). One end of the spring (911) is fixedly connected to the inner wall of the rotating component 1 (907), and the other end of the spring (911) is fixedly connected to a slider 2 (912). The slider 2 (912) is connected to the two sliding grooves 2 (910) on both sides. 10) Sliding inside the through slot five (909), the end of the slider two (912) away from the spring (911) is fixedly connected to a telescopic member (913), the top of the end of the telescopic member (913) away from the slider two (912) is fixedly connected to a locking rod two (914), the outer surface of the locking rod two (914) is provided with a handle (915), and the outer surface of the rotating member two (908) away from the hinge frame (906) is provided with a locking groove two (916) that is compatible with the telescopic member (913) and the locking rod two (914).

2. The system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: A fastener (2) is fixed to the top of the mixing box (1). The fastener (2) includes a support plate (201) and an L-shaped load plate (202). The L-shaped load plate (202) is welded to the top of the support plate (201). The mixing and scraping mechanism (3) is disposed on the outer surface of the L-shaped load plate (202) and the support plate (201). The mixing and scraping mechanism (3) includes a drive motor (301) fixedly installed on the top of the L-shaped load plate (202). The output end of the drive motor (301) extends to the lower side of the L-shaped load plate (202) and is connected to a gear (302). A worm gear (304) is coaxially connected to the lower side of gear one (302). A support member (303) is also provided on the bearing plate (201). The support member (303) is rotatably connected to the lower end of the worm gear one (304). A worm wheel one (305) is meshed with the outer circumferential surface of the worm gear one (304). The worm wheel one (305) is rotatably connected to the bearing plate (201) through a pin. A fixing rod one (306) is fixedly connected to the rotating shaft of the worm wheel one (305). A connecting rod (307) is rotatably connected to the other end of the fixing rod one (306). The connecting rod (307) is away from the gear one (302). One end of fixed rod one (306) is rotatably connected to fixed rod two (308), and the other end of fixed rod two (308) is fixedly connected to the shaft of worm gear two (309). The shaft of worm gear two (309) is rotatably connected to bearing plate (201). Gear two (310) is meshed with the outer circumferential surface of gear one (302). Gear two (310) is coaxially provided with sliding groove one (311). Sliding rod two (312) is slidably connected inside sliding groove one (311). Worm two (313) is fixedly connected to the bottom of sliding rod two (312). The second worm gear (313) is meshed with the second worm gear (309). The bottom of the second worm gear (313) is fixedly connected to a connecting rod (314). The connecting rod (314) extends into the interior of the heat-conducting inner shell (102). On the opposite sides of the outer circumference of the connecting rod (314), stirring blades (315) with opposite inclination angles are fixedly connected. The bottom of the connecting rod (314) is coaxially fixedly connected to a cross-shaped connector (316). Each of the four ends of the connector (316) is fixedly connected to a scraper (317). The scraper (317) abuts against the inner wall of the heat-conducting inner shell (102).

3. A system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: The storage mechanism (5) includes a fixed frame (501) fixedly connected to the bottom of the ash hopper (107). The top of the fixed frame (501) is provided with a through groove (502) adapted to the ash hopper (107). The opposite sides of the outer surface of the fixed frame (501) are fixedly connected with connecting plates (503) by bolts. The outer surfaces of the connecting plates (503) on both sides are provided with slots (504). A feeding box (505) is provided on the lower side of the fixed frame (501). The opposite sides of the outer surface of the feeding box (505) are fixedly connected with fixing blocks (504). 506), a rotating column (507) is rotatably connected to the outer side of the fixed block 1 (506) on both sides. A rotating plate 1 (508) is fixedly connected to the outer circumferential surface of the rotating column (507). A locking rod 1 (509) is fixedly connected to the outer side of the rotating plate 1 (508). A rotating plate 2 (510) is also fixedly connected to the outer circumferential surface of the rotating column (507). A handle (511) is fixedly connected between the ends of the rotating plates 2 (510) on both sides away from the rotating column (507). Wheels (512) are provided at the four corners of the bottom of the feeding box (505).

4. A system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: A mounting plate (10) is fixedly connected to the purification box (7). A vibration mechanism (11) is provided on the outer surface of the mounting plate (10). The vibration mechanism (11) includes a second drive motor (1101) fixedly mounted on the mounting plate (10). The output end of the second drive motor (1101) passes through the mounting plate (10) and is fixedly connected to a turntable (1102). A rotating rod (1103) is also rotatably connected to the mounting plate (10). A rotating strip plate (1104) is rotatably connected to the outer peripheral surface of 103. The rotating rod (1103) is connected to the lower end of the rotating strip plate (1104). A sliding groove three (1105) is provided on the upper side of the rotating rod (1103) on the rotating strip plate (1104). A fixed rod three (1106) is eccentrically rotatably connected to the turntable (1102). The fixed rod three (1106) extends into the interior of the sliding groove three (1105) and is slidably connected to the sliding groove three (1105). The lower end of the rotating strip (1104) is fixedly connected to a fan-shaped toothed plate (1107). The mounting plate (10) and the purification box (7) are both provided with a sliding groove (1111). The sliding groove (1111) is slidably connected to a sliding member (1108). Several sets of racks (1109) are linearly distributed on the top of the sliding member (1108). The fan-shaped toothed plate (1107) is engaged with the sliding member (1108) through several sets of racks (1109). The end of the sliding member (1108) that enters the purification box (7) is fixedly connected to a striking member (1110) for striking the filter frame (8).

5. A system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: Both the high-temperature flue (104) and the low-temperature flue (105) are equipped with electromagnetic valves (106).

6. A system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: The purification box (7) is equipped with a cabinet door (701), and the outlet side of the purification box (7) is connected to a connecting pipe (14).

7. A system for controlling the inlet flue gas temperature of an SCR denitrification device according to claim 1, characterized in that: The top of the mixing box (1) is also provided with a temperature detector (4) for detecting the uniform temperature inside the heat-conducting inner shell (102).

8. A method for controlling the inlet flue gas temperature of an SCR denitrification device, characterized in that, This method is carried out by the system for controlling the inlet flue gas temperature of an SCR denitrification device as described in any one of claims 1-7, comprising: The high-temperature flue gas pipe (104) and the low-temperature flue gas pipe (105) are respectively connected to the thermal power plant and the economizer pipe. When the flue gas temperature discharged from the low-temperature flue gas pipe (105) is not up to standard, the high-temperature flue gas in the pipe connected to the thermal power plant is drawn through the high-temperature flue gas pipe (104). The high-temperature flue gas and the low-temperature flue gas are mixed in the mixing box (1) to increase the flue gas temperature. At the same time, the heating plate (103) is turned on. The heating plate (103) heats the flue gas inside the mixing box (1) through the heat-conducting inner shell (102). At the same time, the mixing and scraping mechanism (3) is turned on. The mixing and scraping mechanism (3) mixes the high-temperature flue gas and the low-temperature flue gas in the mixing box (1). At the same time, the mixing and scraping mechanism (3) scrapes and removes dust from the inner wall of the mixing box (1). The removed dust is collected in the storage mechanism (5) through the dust collection hopper (107). When the temperature in the mixing box (1) reaches the temperature required by the SCR reactor, the air pump (6) is started. The air pump (6) discharges the flue gas in the mixing box (1) into the purification box (7) for filtration to obtain purified flue gas. The purified flue gas in the purification box (7) is then sent into the SCR reactor for reaction.

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