System and method for controlling flue gas temperature at inlet of SCR (Selective Catalytic Reduction) denitration equipment

Abstract

The invention relates to the technical field of flue gas desulfurization and denitration, and discloses a system and method for controlling the flue gas temperature of an inlet of SCR denitration device.The system comprises a mixing box, a mixing and scraping mechanism, an air pump and a purifying box, the mixing box comprises a heat preservation outer shell and a heat conduction inner shell, and a heating plate is arranged between the heat preservation outer shell and the heat conduction inner shell; a high-temperature smoke pipeline and a low-temperature smoke pipeline communicate with the heat conduction inner shell and extend out of the heat preservation outer shell. The mixing and scraping mechanism is arranged in the mixing box and is used for stirring and mixing high-temperature and low-temperature flue gas in the mixing box and scraping dust on the inner wall of the mixing box; the bottom of the mixing box further communicates with an ash guiding hopper, and a storage mechanism is arranged at an outlet of the ash guiding hopper. An inlet of the air pump communicates with an inner cavity of the mixing box through a smoke suction pipe, and the output end of the air pump communicates with an inlet of the purifying box through a smoke outlet pipe. According to the invention, the flue gas temperature at the inlet of the SCR denitration equipment can be controlled to meet the preset requirement, and meanwhile, the flue gas can be purified, so that the service life of the SCR denitration equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization and denitrification, and in particular to a system and method for controlling the inlet flue gas temperature of an SCR denitrification device. Background Art

[0002] Flue gas desulfurization and denitrification technology is a boiler flue gas purification technology used in the chemical industry that produces a lot of 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, pyrolusite method, electron beam ammonia method, pulse corona method, gypsum wet method, catalytic oxidation method, microbial degradation method and other technologies.

[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°C, which is much lower than the 320-400°C range required for the normal performance of the traditional denitrification catalyst. The reduction in flue gas temperature will directly lead to a series of problems such as weakened activity of the denitrification catalyst, easy crystallization of the reducing agent, and corrosion risk of the air preheater, which will seriously affect the denitrification effect and overall operation stability of the unit. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a system and method for controlling the inlet flue gas temperature of SCR denitrification equipment. The technical solution of the present invention solves the problem that the inlet flue gas temperature of the denitrification equipment proposed in the above background technology will significantly drop to the range of 260-300°C. This temperature is much lower than the 320-400°C range required for the normal performance of traditional denitrification catalysts. The reduction in flue gas temperature will directly lead to a series of problems such as weakened activity of the denitrification catalyst, easy crystallization of the reducing agent, and corrosion risk of the air preheater.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: A system for controlling the inlet flue gas temperature of an SCR denitration device, comprising a mixing box, a mixing and scraping mechanism, an air pump and a purification box, wherein the mixing box comprises a heat-insulating outer shell and a heat-conducting inner shell, a heating plate is arranged between the heat-insulating outer shell and the heat-conducting inner shell, a high-temperature flue gas pipeline and a low-temperature flue gas pipeline are connected to the heat-conducting inner shell, and the high-temperature flue gas pipeline and the low-temperature flue gas pipeline extend to the outside of the heat-insulating outer shell; The mixing and scraping mechanism is arranged in the mixing box, and is used to stir and mix the high-temperature and low-temperature flue gases in the mixing box and to scrape the dust on the inner wall of the mixing box; The bottom of the mixing box is also connected to an ash hopper, and the outlet of the ash hopper is provided with a storage mechanism; The inlet of the air pump is communicated with the inner cavity of the mixing box through the smoke extraction pipe, and the output end of the air pump is communicated with the inlet of the purification box through the smoke outlet pipe.

[0006] Preferably: a fixing part is fixed on the top of the mixing box, and the fixing part includes a load-bearing plate and an L-shaped load-bearing plate, and the L-shaped load-bearing plate is welded to the top of the load-bearing plate, and the mixing and scraping mechanism is arranged on the outer surfaces of the L-shaped load-bearing plate and the load-bearing plate, and the mixing and scraping mechanism includes a driving motor 1 fixedly installed on the top of the L-shaped load-bearing plate, and the output end of the driving motor 1 extends to the lower side of the L-shaped load-bearing plate and is connected to a gear 1, and a worm 1 is coaxially connected to the lower side of the gear 1, and a support part is also provided on the load-bearing plate, and the support part is rotatably connected to the lower end of the worm 1, and a worm wheel 1 is meshingly connected to the outer peripheral surface of the worm 1, and the worm wheel 1 is rotatably connected to the load-bearing plate through a pin shaft, and a fixing rod 1 is fixedly connected to the rotating shaft of the worm wheel 1, and the other end of the fixing rod 1 is rotatably connected to a connecting rod, and the connecting rod is away from One end of fixed rod one is rotatably connected to fixed rod two, and the other end of fixed rod two is fixedly connected to the rotating shaft of worm gear two, and the rotating shaft of worm gear two is rotatably connected to the carrying plate; the outer circumferential surface of gear one is meshingly connected to gear two, and gear two is coaxially provided with slide groove one, and the inside of slide groove one is slidably connected to slide rod two, and the bottom of slide rod two is fixedly connected to worm gear two, and worm gear two is meshingly connected to worm gear two, and the bottom of worm gear two is fixedly connected to connecting rod, and the connecting rod extends to the interior of the heat-conducting inner shell, and stirring blades with opposite inclination angles are fixedly connected on opposite sides of the outer circumference of the connecting rod, and a cross-shaped connecting piece is coaxially fixedly connected to the bottom of the connecting rod, and scrapers are fixedly connected to the four ends of the connecting piece, and the scraper contacts the inner wall of the heat-conducting inner shell.

[0007] Preferably: the storage mechanism includes a fixed frame fixedly connected to the bottom of the ash hopper, the top of the fixed frame is provided with a through groove compatible with the ash hopper, the opposite sides of the outer surface of the fixed frame are fixedly connected with connecting plates by bolts, the outer surfaces of the connecting plates on both sides are provided with a card slot, the lower side of the fixed frame is provided with a discharge box, the opposite sides of the outer surface of the discharge box are fixedly connected with a fixed block, the outer sides of the fixed blocks on both sides are rotatably connected with a rotating column, the outer peripheral surface of the rotating column is fixedly connected with a rotating plate, the outer side of the rotating plate is fixedly connected with a clamping rod, the outer peripheral surface of the rotating column is also fixedly connected with a rotating plate 2, a handle is fixedly connected between the ends of the rotating plates 2 on both sides away from the rotating column, and wheels are provided at the four corners of the bottom of the discharge box.

[0008] Preferably: the smoke outlet pipe extends to the interior of the purification box and is connected with the filter frame, a locking mechanism is provided at the connection position between the smoke outlet pipe and the filter frame, a plurality of groups of through grooves 2 are linearly opened on the outer surface of the filter frame, a connecting pipe 1 is welded to the inlet of the filter frame, the locking mechanism comprises three groups of fixing blocks 2 which are equidistantly connected to the outer circumference of the smoke outlet pipe, the outer surfaces of the three groups of the fixing blocks 2 are all provided with through grooves 3, the outer circumference of the connecting pipe 1 is also equidistantly connected with three groups of fixing blocks 3, the outer surfaces of the three groups of the fixing blocks 3 are provided with through grooves 4, the outer circumference of the smoke outlet pipe is also fixedly connected with a fixing block 4, the opposite sides of the outer surface of the fixing block 4 are fixedly installed with hinged frames, and the interiors of the hinged frames on both sides are rotatably connected with a rotating member 1 and a rotating member 2 respectively.

[0009] Preferably: a through slot five is provided inside the end of the rotating member one away from the articulated frame, a sliding slot two is provided opposite to the through slot five and inside the rotating member one, a spring is provided inside the through slot five, one end of the spring is fixedly connected to the inner wall of the rotating member one, the other end of the spring is fixedly connected to a slider two, the slider two slides inside the through slot five through the sliding slots two on both sides, the end of the slider two away from the spring is fixedly connected to a telescopic member, the top of the telescopic member away from the slider two is fixedly connected to a clamping rod two, a handle is provided on the outer surface of the clamping rod two, and a clamping slot two matching the telescopic member and the clamping rod two is provided on the outer surface of the end of the rotating member two away from the articulated frame.

[0010] Preferably: a mounting plate is fixedly connected in the purification box, a vibration mechanism is arranged on the outer surface of the mounting plate, the vibration mechanism comprises a driving motor 2 fixedly mounted on the mounting plate, the output end of the driving motor 2 passes through the mounting plate and is fixedly connected with a turntable, a rotating rod is also rotatably connected to the mounting plate, a rotating strip is rotatably connected to the outer circumference of the rotating rod, the rotating rod is connected to the lower end of the rotating strip, a sliding groove 3 is provided on the rotating strip on the upper side of the rotating rod, the rotating disc is eccentrically rotatably connected with the fixing rod 3, the fixing rod 3 extends into the interior of the sliding groove 3 and is slidably connected with the sliding groove 3; The lower end of the rotating strip is fixedly connected with a fan-shaped tooth plate, and the mounting plate and the purification box are provided with a slide groove four, the inside of the slide groove four is slidably connected with a sliding member, and a plurality of groups of racks are linearly distributed on the top of the sliding member. The fan-shaped tooth plate is meshed and connected with the sliding member through a plurality of groups of racks, and a knocking member for knocking the filter frame is fixedly connected to one end of the sliding member entering the purification box.

[0011] Preferably, electromagnetic valves are provided on both the high-temperature smoke duct and the low-temperature smoke duct.

[0012] Preferably, the purification box is provided with a cabinet door, and the outlet side of the purification box is connected with a second connecting pipe.

[0013] Preferably: a temperature detector for detecting the uniform temperature inside the heat-conducting inner shell is also provided on the top of the mixing box.

[0014] The present invention also provides a method for controlling the inlet flue gas temperature of an SCR denitration device. The method is performed by the system for controlling the inlet flue gas temperature of an SCR denitration device as described above, comprising: 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 temperature of the flue gas discharged from the low-temperature flue gas duct does not meet the standard, the high-temperature flue gas in the duct connected to the thermal power plant is extracted through the high-temperature flue gas duct, and the high-temperature flue gas and the low-temperature flue gas are mixed in a 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. At the same time, the mixing and scraping mechanism is turned on, and the high-temperature flue gas and the low-temperature flue gas in the mixing box are mixed through the mixing and scraping mechanism. At the same time, the mixing and scraping mechanism scrapes the inner wall of the mixing box to remove dust, and the removed dust is collected into the storage mechanism through the ash hopper; when the temperature in the mixing box reaches the required temperature of the SCR reactor, the air pump is started, and the flue gas in the mixing box is discharged into the purification box for filtration through the air pump to obtain purified flue gas, and then the purified flue gas in the purification box is sent to the SCR reactor for reaction.

[0015] The present invention has the following beneficial effects: The present invention is used in a system for controlling the inlet flue gas temperature of the SCR denitrification equipment. Through the design of the mixing box, when the flue gas temperature discharged from the low-temperature flue gas duct does not meet the standard, the flue gas can be extracted from the high-temperature flue gas duct for neutralization, and the heating plate is started to assist in heating to ensure that the flue gas temperature meets the subsequent processing requirements. The present invention achieves full dispersion and fusion of the flue gas in the mixing box through the design of the mixing and scraping mechanism, effectively avoiding the problem of partial overheating or uneven heat of the flue gas. At the same time, the design also cleverly uses the connecting rod and scraper structure to reciprocate and scrape the dust on the inner wall of the mixing box, effectively collecting and cleaning the dust, and improving the practicality and maintenance convenience of the device. Through the design of the storage mechanism, the present invention allows users to easily clean up the accumulated dust. Through simple operations, the discharge box can be easily unlocked from the bottom of the ash hopper and moved to a designated location for dumping, which greatly simplifies the dust handling process.

[0016] Furthermore, a locking mechanism is provided at the connection position between the smoke outlet pipe and the filter frame of the present invention. Through the design of the locking mechanism, the dust filtering effect in the smoke can be significantly improved to ensure that the discharged smoke meets environmental protection standards. At the same time, the quick replacement design of the filter frame makes maintenance work more convenient and efficient.

[0017] Furthermore, the present invention provides a vibration mechanism at the purification box. Through the design of the vibration mechanism and the continuous striking of its striking member, dust can be effectively prevented from clogging the filter frame, ensuring that smoke can be smoothly discharged from the filter frame, thereby ensuring the continuous and stable operation of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a system for controlling the inlet flue gas temperature of an SCR denitration device in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the internal three-dimensional structure of the mixing box in an embodiment of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of a part of the mixing and scraping mechanism in an embodiment of the present invention; Figure 4 A schematic diagram of a three-dimensional structure of a mixing and scraping mechanism in an embodiment of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the mixing and scraping mechanism of other parts in the embodiment of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the remaining mixing and scraping mechanism in the embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the storage mechanism in the embodiment of the present invention; Figure 8 For the present invention Figure 7 A partial enlarged schematic diagram in the middle; Fig. 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; Fig.10 This is a schematic diagram of the three-dimensional structure of the locking mechanism installed in an embodiment of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the locking mechanism in an embodiment of the present invention; Fig.12 It is a schematic diagram of a three-dimensional structure of a rotating member in an embodiment of the present invention; Fig.13 For the present invention Fig.11 A partial enlarged schematic diagram of point B in the middle; Fig.14 For the present invention Fig.11 A partial enlarged schematic diagram of point C in the middle; Fig.15 For the present invention Fig.11 The partial enlarged schematic diagram of point D in the middle; Fig.16 This is a schematic diagram of the three-dimensional structure of the vibration mechanism installed in the embodiment of the present invention; Fig.17 It is a schematic diagram of the three-dimensional structure of part of the vibration mechanism in the embodiment of the present invention; Fig.18 It is a schematic diagram of the three-dimensional structure of the remaining vibration mechanism in the embodiment of the present invention.

[0019] The numbers in the figure are: 1. Mixing box; 101. Insulation outer shell; 102. Heat-conducting inner shell; 103. Heating plate; 104. High-temperature smoke duct; 105. Low-temperature smoke duct; 106. Solenoid valve; 107. Ash hopper; 2. Fixing parts; 201. Load-bearing plate; 202. L-shaped load-bearing plate; 3. Mixing and scraping mechanism; 301. Driving motor 1; 302. Gear 1; 303. Support member; 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 1; 312. Slide rod; 313. Worm 2; 314. Connecting rod; 315. Stirring blade; 316. Connecting member; 317. Scraper.

[0020] 4. Temperature detector; 5. Storage mechanism; 501. Fixed frame; 502. Through slot 1; 503. Connecting plate; 504. Card slot 1; 505. Unloading box; 506. Fixed block 1; 507. Rotating column; 508. Rotating plate 1; 509. Card rod 1; 510. Rotating plate 2; 511. Handle; 512. Wheel; 6. Air pump; 7. Purification box; 701. Cabinet door; 8. Filter frame; 801. Through slot 2; 802. Connecting pipe 1; 9. Locking mechanism; 901. Fixed block 2; 902. Through slot 3; 903. Fixed block 3; 904. Through slot 4; 905. Fixed block 4; 906. Articulated frame; 907. Rotating member 1; 908. Rotating member 2; 909. Through slot 5; 910. Sliding slot 2; 911. Spring; 912. Sliding block; 913. Telescopic member; 914. Clamping rod 2; 915. Handle; 916. Clamping slot 2; 10. Mounting plate; 11. Vibration mechanism; 1101. Driving motor 2; 1102. Turntable; 1103. Rotating rod; 1104. Rotating strip plate; 1105. Slide 3; 1106. Fixed rod 3; 1107. Fan-shaped tooth plate; 1108. Sliding member; 1109. Rack; 1110. Beating member; 1111. Slide 4; 12. Smoke extraction pipe; 13. Smoke outlet pipe; 14. Connecting pipe 2. DETAILED DESCRIPTION

[0021] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0022] Please refer to Figures 1 to 18 As shown, the system for controlling the inlet flue gas temperature of the SCR denitration equipment in this embodiment includes a mixing box 1 and a fixing part 2. The mixing box 1 includes an insulating outer shell 101 and a heat-conducting inner shell 102. A heating plate 103 is arranged between the insulating outer shell 101 and the heat-conducting inner shell 102. The heat-conducting inner shell 102 is connected with a high-temperature flue gas duct 104 and a low-temperature flue gas duct 105. The high-temperature flue gas duct 104 and the low-temperature flue gas duct 105 extend to the outside of the insulating outer shell 101. A temperature detector 4 for detecting the internal temperature of the heat-conducting inner shell 102 is also arranged on the top of the mixing box 1. The high-temperature flue gas duct 104 and the low-temperature flue gas duct 105 are both provided with an electromagnetic valve 106. The high-temperature flue gas duct 104 and the low-temperature flue gas duct 105 are respectively connected to the thermal power plant and the economizer pipeline. When in use, the high-temperature smoke duct 104 and the low-temperature smoke duct 105 are effectively connected to the thermal power plant and the economizer duct respectively. When the temperature detector 4 detects that the temperature of the flue gas discharged from the low-temperature smoke duct 105 does not meet the standard, the high-temperature smoke duct 104 is controlled by the electromagnetic valve 106 to extract the flue gas in the pipeline connected to the thermal power plant, thereby achieving the neutralization of the high-temperature flue gas and the low-temperature flue gas in the mixing box 1, increasing the flue gas temperature, and at the same time turning on the heating plate 103. The heating plate 103 heats the flue gas inside the mixing box 1 through the heat-conducting inner shell 102, and the heat-insulating outer shell 101 prevents the flue gas from dissipating, further improving the efficiency of flue gas heating.

[0023] In this embodiment, see Figure 1-Figure 6 The fixing member 2 is welded on the top of the mixing box 1. The fixing member 2 includes a bearing plate 201 and an L-shaped load plate 202. The L-shaped load plate 202 is welded on the top of the bearing plate 201. The outer surfaces of the L-shaped load plate 202 and the bearing plate 201 are provided with a mixing and scraping mechanism 3. Figure 2-Figure 6 The mixing and scraping mechanism 3 includes a driving motor 301 fixedly mounted on the top of the L-shaped load plate 202, the output end of the driving motor 301 extends to the lower side of the L-shaped load plate 202 and is connected to the gear 302 through the peripheral fixing, and the front side of the load plate 201 (with Figure 3The worm gear 304 is connected to the support plate 201 through a pin shaft. The front side of the worm gear 305 is fixedly connected to the support plate 201, and the worm gear 304 is connected to the support plate 201 through a pin shaft. The front side of the worm gear 305 is fixedly connected to a fixed rod 306, and the worm gear 305 can rotate synchronously with the fixed rod 306. The other end of the fixed rod 306 is rotatably connected to a connecting rod 307. The end of the connecting rod 307 away from the fixed rod 306 is rotatably connected to a fixed rod 2 308. The other end of the fixed rod 2 308 is fixedly connected to a worm gear 2 309 on the rear side. The fixed rod 2 308 can rotate synchronously with the worm gear 2 309. The worm gear 2 309 is connected to the support plate 201 through a pin shaft. 01 rotation connection, the outer circumferential surface of gear 1 302 is meshedly connected with gear 2 310, the center of gear 2 310 is provided with a slide groove 1 311, the inside of the slide groove 1 311 is slidably connected with a slide rod 2 312, the bottom of the slide rod 2 312 is fixedly connected with a worm 2 313, the worm 2 313 is meshed with the worm wheel 2 309, the bottom of the worm 2 313 is fixedly connected with a connecting rod 314, the connecting rod 314 extends to the inside of the heat-conducting inner shell 102, and the opposite sides of the outer circumferential surface of the connecting rod 314 are fixedly connected with stirring blades 315 with opposite inclination angles, the bottom of the connecting rod 314 is coaxially fixedly connected with a cross-shaped connecting piece 316, the four ends of the connecting piece 316 are fixedly connected with scrapers 317, the scrapers 317 are in conflict with the inner wall of the heat-conducting inner shell 102, the bottom of the mixing box 1 is also connected to an ash hopper 107, and the end of the ash hopper 107 away from the mixing box 1 is provided with a storage mechanism 5. In this embodiment, in order to avoid the problem of partial overheating or uneven heat of the flue gas in the mixing box 1, the driving motor 1 301 is turned on at this time, and the driving motor 1 301 drives the gear 1 302 to rotate, so that the worm 1 304 rotates, and the rotation of the worm 1 304 drives the worm wheel 1 305 to rotate, and the worm wheel 1 305 drives the worm wheel 2 309 to rotate through the cooperation of the fixed rod 1 306, the connecting rod 307 and the fixed rod 2 308, and the worm wheel 2 309 drives the worm 2 313 to rise and fall. It is worth noting that when the gear 1 302 rotates, it will also drive the meshing gear 2 310 to rotate, and the gear 2 310 drives the slide rod The second 312 rotates, and then the worm gear 313 rotates, so that the slide bar 312 slides inside the slide groove 1 311. At this time, the connecting rod 314 will rotate back and forth, and then the flue gas in the mixing box 1 will be broken up by the stirring blades 315 with opposite inclination angles on both sides, so as to fully merge the flue gas. During the process of breaking up the flue gas, 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 to reciprocate and scrape the dust on the inner wall of the mixing box 1 through the connecting piece 316, so that the dust enters the interior of the storage mechanism 5 through the ash hopper 107, further improving the practicability of the device.

[0024] See also Figure 7 and Figure 8 The storage mechanism 5 of this embodiment includes a fixed frame 501 fixedly connected to the bottom of the ash hopper 107, a through slot 502 adapted to the ash hopper 107 is provided on the top of the fixed frame 501, connecting plates 503 are fixedly connected to the opposite sides of the outer surface of the fixed frame 501 by bolts, and the outer surfaces of the connecting plates 503 on both sides are provided with a card slot 504, and a material box 505 is provided on the lower side of the fixed frame 501, and the outer surface of the material box 505 is fixedly connected with A fixed block 506 is provided, and the outer sides of the fixed blocks 506 on both sides are rotatably connected with a rotating column 507, the outer peripheral surface of the rotating column 507 is fixedly connected with a rotating plate 508, the outer side of the rotating plate 508 is fixedly connected with a clamping rod 509, the outer peripheral surface of the rotating column 507 is also fixedly connected with a rotating plate 2 510, and a handle 511 is fixedly connected between the ends of the rotating plates 2 510 on both sides away from the rotating column 507, and wheels 512 are provided at the four corners of the bottom of the unloading box 505. When the dust in the discharge box 505 needs to be cleaned, the user first holds the handle 511 and pushes it upwards. The rotating plates 510 on both sides drive the rotating column 507 to rotate, and then drive the rotating plate 508 to rotate. The rotating plate 508 drives the clamping rod 509 to rotate until the rotating column 507 and the clamping rod 509 rotate to the same horizontal plane. At this time, the handle 511 can be pulled outward to make the rotating column 507 and the clamping rod 509 move away from the clamping groove 504, and then the discharge box 505 falls and drives the dust to move and pour it into the designated location through the wheels 512. Similarly, when the discharge box 505 needs to be locked at the bottom of the ash hopper 107, it is only necessary to push the rotating column 507 and the clamping rod 509 into the clamping groove 504 in parallel, and then press the handle 511 downward to clamp the discharge box 505 into the clamping groove 504.

[0025] See also Figure 1 , Figure 9-Figure 15The outer surface of the mixing box 1 of this embodiment is connected with a smoke extraction pipe 12, the other end of the smoke extraction pipe 12 is connected with the input end of the air pump 6, the output end of the air pump 6 is connected with a smoke outlet pipe 13, the end of the smoke outlet pipe 13 away from the air pump 6 is connected with the purification box 7, and the smoke outlet pipe 13 extends to the inside of the purification box 7 and is connected with the filter frame 8. A locking mechanism 9 is provided at the connection position between the smoke outlet pipe 13 and the filter frame 8. A plurality of through grooves 801 are linearly opened on the outer surface of the filter frame 8, and a connecting pipe 8 is welded on the left end of the filter frame 8. 02, the locking mechanism 9 includes three sets of fixing blocks 901 connected to the outer circumference of the smoke outlet pipe 13 at equal distances in the circumference, and the outer surfaces of the three sets of fixing blocks 901 are all provided with through grooves 902, and the outer circumference of the connecting pipe 1 802 is also connected to three sets of fixing blocks 903 at equal distances in the circumference, and the outer surfaces of the three sets of fixing blocks 903 are provided with through grooves 904, and the outer circumference of the smoke outlet pipe 13 is also fixedly connected to a fixing block 905, and the outer surfaces of the fixing block 905 are fixedly installed with hinged frames 906 on opposite sides, and both sides are fixedly connected to the outer circumference of the smoke outlet pipe 13. The hinged frame 906 is rotatably connected to a rotating member 1 907 and a rotating member 2 908, respectively. A through slot 5 909 is provided in the rotating member 1 907 at one end away from the hinged frame 906, and a slide slot 2 910 is provided opposite to the through slot 5 909 and in the rotating member 1 907. A spring 911 is provided in the through slot 5 909, and one end of the spring 911 is fixedly connected to the inner wall of the rotating member 1 907, and the other end of the spring 911 is fixedly connected to a slide block 2 912, and the slide block 2 912 is connected to the hinged frame 906. The sliding grooves 910 on both sides slide inside the through groove 5 909, the end of the sliding block 912 away from the spring 911 is fixedly connected with a telescopic member 913, the top of the end of the telescopic member 913 away from the sliding block 912 is fixedly connected with a clamping rod 914, the outer surface of the clamping rod 914 is provided with a handle 915, the outer surface of the end of the rotating member 908 away from the hinged frame 906 is provided with a clamping groove 916 compatible with the telescopic member 913 and the clamping rod 914, and 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 gases are fully integrated and reach the required temperature of the SCR reactor, the air pump 6 is started, and the air pump 6 discharges the flue gas into the purification box 7 through the smoke outlet pipe 13. The flue gas will enter the interior of the filter frame 8, and the second through groove 801 deeply blocks the dust from overflowing, so that the deeply filtered flue gas is discharged to the outside of the filter frame 8, further improving the filtering effect of the dust in the flue gas. When the filter frame 8 needs to be replaced, it only needs to open the cabinet door 701, then hold the handle 915 and push it to the filter frame 8. When the rotating member 908 slides in the direction of the through slot 5 909, the telescopic member 913 will compress the spring 911 through the slider 912 and slide along the slide slot 910 into the interior of the through slot 5 909, so that the clamping rod 914 and the handle 915 are away from the clamping slot 2 916, and then the rotating member 1 907 and the rotating member 2 908 are rotated through the hinged frame 906 on both sides of the fixed block 4 905, so that the rotating member 1 907 and the rotating member 2 908 are separated from the through slot 3 902 and the through slot 4 904, and the filter frame 8 can be quickly removed, thereby quickly replacing the filter frame 8.

[0026] See also Figure 1 , Figure 16-Figure 18The right side of the purification box 7 of this embodiment is connected with a connecting pipe 2 14, and the right side of the purification box 7 is fixedly connected with a mounting plate 10, and the outer surface of the mounting plate 10 is provided with a vibration mechanism 11, and the vibration mechanism 11 includes a driving motor 2 1101 fixedly mounted on the outer side of the mounting plate 10, and the output end of the driving motor 2 1101 extends to the outer side of the mounting plate 10, and is coaxially fixedly connected with a turntable 1102, and the outer side of the mounting plate 10 is also rotatably connected with a rotating rod 1103 below the turntable 1102, and the outer peripheral surface of the rotating rod 1103 is rotatably connected with a rotating strip plate 1104, and the rotating strip plate 1104 is provided with a slide groove 3 on the upper side of the rotating rod 1103 1105, the inner sliding connection of the slide groove three 1105 is connected with the fixed rod three 1106, the fixed rod three 1106 is eccentrically connected to the outer surface of the turntable 1102, the bottom of the rotating strip plate 1104 is fixedly connected with the fan-shaped tooth plate 1107, the outer surfaces of the mounting plate 10 and the purification box 7 are provided with slide groove four 1111, the inner sliding connection of the slide groove four 1111 is connected with the sliding member 1108, a plurality of groups of racks 1109 are linearly distributed on the top of the sliding member 1108, the fan-shaped tooth plate 1107 is meshed with the sliding member 1108 through a plurality of groups of racks 1109, and the end of the sliding member 1108 entering the purification box 7 is fixedly connected with the knocking member 1110. 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 quickly replaced, in order to prevent the dust in the flue gas from clogging the second through slot 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, and the second drive motor 1101 drives the turntable 1102 to rotate, thereby driving the fixed rod 3 1106 to rotate eccentrically, and through the coordinated use of the rotating rod 1103, the fixed rod 3 1106 drives the fan-shaped tooth plate 1107 to reciprocate when sliding in the slide groove 3 1105, and the sliding member 1108 is driven to slide inside the slide groove 4 1111 by a plurality of groups of racks 1109 arranged on the top of the sliding member 1108, thereby driving the knocking member 1110 to continuously knock the outer surface of the filter frame 8 back and forth, effectively preventing the problem of dust clogging the second through slot 801, and the flue gas discharged from the outside of the filter frame 8 will enter the interior of the SCR reactor through the connecting pipe 2 14, effectively avoiding the problem of too low flue gas temperature or too much dust.

[0027] The above shows and describes 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 above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A system for controlling the inlet flue gas temperature of an SCR denitration device, characterized in that: The invention comprises a mixing box (1), a mixing and scraping mechanism (3), an air pump (6) and a purification box (7); the mixing box (1) comprises a heat-insulating outer shell (101) and a heat-conducting inner shell (102); a heating plate (103) is arranged between the heat-insulating outer shell (101) and the heat-conducting inner shell (102); a high-temperature smoke duct (104) and a low-temperature smoke duct (105) are connected to the heat-conducting inner shell (102); the high-temperature smoke duct (104) and the low-temperature smoke duct (105) extend to the outside of the heat-insulating outer shell (101); The mixing and scraping mechanism (3) is arranged on the mixing box (1), and is used to stir and mix the high-temperature and low-temperature flue gases in the mixing box (1) and to scrape 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).

2. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 1, characterized in that: A fixing member (2) is fixed on the top of the mixing box (1), the fixing member (2) comprising a bearing plate (201) and an L-shaped load plate (202), the L-shaped load plate (202) being welded to the top of the bearing plate (201), the mixing and scraping mechanism (3) being arranged on the outer surfaces of the L-shaped load plate (202) and the bearing plate (201), the mixing and scraping mechanism (3) comprising a driving motor 1 (301) fixedly mounted on the top of the L-shaped load plate (202), the output end of the driving motor 1 (301) extending to the lower side of the L-shaped load plate (202) and connected to a gear 1 (302). The lower side of gear one (302) is coaxially connected to a worm one (304), the carrier plate (201) is further provided with a support member (303), the support member (303) is rotatably connected to the lower end of the worm one (304), the outer peripheral surface of the worm one (304) is meshingly connected to a worm wheel one (305), the worm wheel one (305) is rotatably connected to the carrier plate (201) via a pin shaft, a fixed rod one (306) is fixedly connected to the rotating shaft of the worm wheel one (305), the other end of the fixed rod one (306) is rotatably connected to a connecting rod (307), the connecting rod (307) is away from One end of the fixed rod 1 (306) is rotatably connected to the fixed rod 2 (308), and the other end of the fixed rod 2 (308) is fixedly connected to the rotating shaft of the worm gear 2 (309), and the rotating shaft of the worm gear 2 (309) is rotatably connected to the bearing plate (201); the outer peripheral surface of the gear 1 (302) is meshingly connected to the gear 2 (310), and the gear 2 (310) is coaxially provided with a slide groove 1 (311), and the interior of the slide groove 1 (311) is slidably connected to the slide rod 2 (312), and the bottom of the slide rod 2 (312) is fixedly connected to the worm gear 2 (313), and the worm gear The second worm gear (313) is meshingly connected with the second worm gear (309); the bottom of the second worm gear (313) is fixedly connected with a connecting rod (314); the connecting rod (314) extends into the interior of the heat-conducting inner shell (102); and stirring blades (315) with opposite inclination angles are fixedly connected to opposite sides of the outer circumference of the connecting rod (314); the bottom of the connecting rod (314) is coaxially fixedly connected with a cross-shaped connecting piece (316); the four ends of the connecting piece (316) are fixedly connected with scrapers (317); the scrapers (317) are in contact with the inner wall of the heat-conducting inner shell (102).

3. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 1, characterized in that: The storage mechanism (5) comprises a fixed frame (501) fixedly connected to the bottom of the ash guide hopper (107); a through slot (502) adapted to the ash guide hopper (107) is provided on the top of the fixed frame (501); connecting plates (503) are fixedly connected to opposite sides of the outer surface of the fixed frame (501) by bolts; the outer surfaces of the connecting plates (503) on both sides are provided with a clamping slot (504); a material discharge box (505) is provided at the lower side of the fixed frame (501); and fixing blocks (506) are fixedly connected to opposite sides of the outer surface of the material discharge box (505). 506), the outer sides of the fixed blocks 1 (506) on both sides are rotatably connected to rotating columns (507), the outer peripheral surface of the rotating columns (507) is fixedly connected to rotating plates 1 (508), the outer side of the rotating plates 1 (508) is fixedly connected to clamping rods 1 (509), the outer peripheral surface of the rotating columns (507) is also fixedly connected to rotating plates 2 (510), and handles (511) are fixedly connected between the ends of the rotating plates 2 (510) on both sides away from the rotating columns (507), and wheels (512) are provided at the four corners of the bottom of the unloading box (505).

4. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 1, characterized in that: The smoke outlet pipe (13) extends to the interior of the purification box (7) and is connected to the filter frame (8). A locking mechanism (9) is provided at the position where the smoke outlet pipe (13) and the filter frame (8) are connected. A plurality of groups of through grooves (801) are linearly provided 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) comprises three groups of fixing blocks (901) equidistantly connected to the outer surface of the smoke outlet pipe (13). The outer surfaces of the three groups of fixing blocks (901) are provided with There is a through groove three (902), the outer circumferential surface of the connecting pipe one (802) is also circumferentially equidistantly connected with three groups of fixed blocks three (903), the outer surfaces of the three groups of fixed blocks three (903) are provided with through groove four (904), the outer circumferential surface of the smoke outlet pipe (13) is also fixedly connected with a fixed block four (905), and the outer surfaces of the fixed block four (905) are fixedly installed with hinged frames (906) on opposite sides, and the insides of the hinged frames (906) on both sides are rotatably connected with a rotating part one (907) and a rotating part two (908) respectively.

5. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 4, characterized in that: A through slot five (909) is provided inside the rotating member one (907) at one end away from the hinged frame (906), and a slide slot two (910) is provided inside the rotating member one (907) opposite to the through slot five (909), and a spring (911) is provided inside the through slot five (909), and one end of the spring (911) is fixedly connected to the inner wall of the rotating member one (907), and the other end of the spring (911) is fixedly connected to a slide block two (912), and the slide block two (912) is connected to the rotating member one (907) through the slide slots two (910) on both sides. 10) sliding inside the through groove 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 clamping rod two (914), the outer surface of the clamping rod two (914) is provided with a handle (915), and the outer surface of the end of the rotating member two (908) away from the hinged frame (906) is provided with a clamping groove two (916) adapted to the telescopic member (913) and the clamping rod two (914).

6. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 1, characterized in that: The purification box (7) is fixedly connected to a mounting plate (10), and a vibration mechanism (11) is provided on the outer surface of the mounting plate (10). The vibration mechanism (11) comprises a second drive motor (1101) fixedly mounted on the mounting plate (10), and the output end of the second drive motor (1101) passes through the mounting plate (10) and is fixedly connected to a turntable (1102). The mounting plate (10) is also rotatably connected to a rotating rod (1103), and the rotating rod (1103) is connected to the mounting plate (10). The outer peripheral surface of the rotating plate (103) is rotatably connected with a rotating strip plate (1104), the rotating rod (1103) is connected to the lower end of the rotating strip plate (1104), the rotating strip plate (1104) is provided with a sliding groove (1105) on the upper side of the rotating rod (1103), and the rotating disk (1102) is eccentrically rotatably connected with the fixed rod (1106), and the fixed rod (1106) extends into the interior of the sliding groove (1105) and is slidably connected to the sliding groove (1105); The lower end of the rotating strip plate (1104) is fixedly connected to a fan-shaped tooth plate (1107), and the mounting plate (10) and the purification box (7) are both provided with a slide groove four (1111), and the interior of the slide groove four (1111) is slidably connected to a sliding member (1108), and a plurality of groups of racks (1109) are linearly distributed on the top of the sliding member (1108), and the fan-shaped tooth plate (1107) is meshedly connected to the sliding member (1108) through the plurality of groups of racks (1109), and a knocking member (1110) for knocking the filter frame (8) is fixedly connected to one end of the sliding member (1108) entering the purification box (7).

7. A system for controlling the inlet flue gas temperature of an SCR denitration device according to claim 1, characterized in that: The high-temperature smoke duct (104) and the low-temperature smoke duct (105) are both provided with electromagnetic valves (106).

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

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

10. A method for controlling the inlet flue gas temperature of an SCR denitration device, characterized in that: The method is carried out by the system for controlling the inlet flue gas temperature of the SCR denitration equipment according to any one of claims 1 to 8, comprising: The high-temperature smoke duct (104) and the low-temperature smoke duct (105) are connected to the thermal power plant and the economizer duct respectively. When the temperature of the smoke discharged from the low-temperature smoke duct (105) does not meet the standard, the high-temperature smoke in the duct connected to the thermal power plant is extracted through the high-temperature smoke duct (104). The high-temperature smoke and the low-temperature smoke are mixed in the mixing box (1) to increase the smoke temperature. At the same time, the heating plate (103) is turned on. The heating plate (103) heats the smoke 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), and at the same time, the mixing and scraping mechanism (3) scrapes the inner wall of the mixing box (1) to remove dust, and the removed dust is collected into the storage mechanism (5) through the ash hopper (107); when the temperature in the mixing box (1) reaches the required temperature of the SCR reactor, the air pump (6) is started, and the flue gas in the mixing box (1) is discharged into the purification box (7) through the air pump (6) for filtration to obtain purified flue gas, and then the purified flue gas in the purification box (7) is sent to the SCR reactor for reaction.

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