Denitration system for 100MW-grade combined cycle unit

Abstract

The invention is applicable to the technical field of flue gas treatment, and provides a denitration system for a 100MW-grade combined cycle unit, which comprises a mixed conveying part connected with a smoke exhaust pipe of the combined cycle unit, a plurality of denitration assemblies are uniformly and fixedly mounted on the mixing and conveying part; the denitration assembly comprises a fixing frame, a swinging part rotationally arranged on the fixing frame and a rotating part rotationally arranged in the swinging part; a plate-type denitration catalyst is arranged in the rotating part in a sliding manner; the plate-type denitration catalyst comprises three groups of denitration catalyst blocks which are coaxially arranged; according to the device, the positions of the three groups of denitration catalyst blocks are sequentially changed through linkage matching of all the parts, so that full contact between the denitration catalyst blocks at the front end and the rear end of the plate-type denitration catalyst and flue gas is ensured, and meanwhile, full contact between the denitration catalyst block in the middle and the flue gas is ensured; and the utilization rate of the plate-type denitration catalyst is improved, so that waste is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and more specifically, to a denitration system for a 100MW combined cycle unit. Background Art

[0002] The 100MW combined cycle steam turbine is a unit that matches the 270MW heavy-duty gas turbine to realize the combined cycle of gas and steam. It is a two-cylinder, two-exhaust, reheat, multi-pressure, condensing steam turbine. Its high and medium pressure adopts a combined cylinder structure, with 7 high-pressure cylinders and 7 medium-pressure cylinders, which is an impulse design; the low pressure is a symmetrical counter-flow type, with 7 positive and negative stages, which is a reaction design.

[0003] The high-temperature industrial flue gas generated by the combined cycle unit needs to be denitrified. After searching, a dust removal and denitrification method with the announcement number CN111773833B was found. After a period of application, when the denitrification coefficient of the contact end of the denitrification catalyst that first contacts the flue gas will gradually decrease, the two corrugated telescopic tubes can be disassembled from the outgoing end and the input end respectively, and then the square shell can be rotated 180° through the cooperation of the T-axis groove and the T-axis rotation, thereby flipping the denitrification catalyst and turning its other end into the first contact end in contact with the flue gas, thereby eliminating the need to directly replace the new denitrification catalyst, thereby improving the utilization rate of the denitrification catalyst and reducing waste.

[0004] However, in the above-mentioned denitration method, the replacement process of the denitration catalyst requires manual disassembly and assembly, which has low work efficiency. At the same time, by rotating the denitration catalyst to swap the positions of the head and tail, the two ends of the denitration catalyst in contact with the flue gas are fully utilized. However, the utilization rate of the denitration catalyst in the middle position is difficult to control. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a denitration system for a 100MW combined cycle unit. Through the linkage cooperation between various components, the positions of three groups of denitration catalyst blocks are changed in sequence, which not only ensures that the denitration catalyst blocks at the front and rear ends of the plate-type denitration catalyst are in full contact with the flue gas, but also ensures that the denitration catalyst blocks in the middle position are in full contact with the flue gas, thereby improving the utilization rate of the plate-type denitration catalyst to reduce waste.

[0006] To achieve the above object, the present invention provides the following technical solutions: A denitration system for a 100MW-class combined cycle unit comprises a mixing and conveying part connected to an exhaust pipe of the combined cycle unit; a plurality of denitration components are evenly and fixedly mounted on the mixing and conveying part; the denitration component comprises a fixed frame, a swinging part rotatably arranged on the fixed frame, and a rotating part rotatably arranged inside the swinging part; a plate-type denitration catalyst is slidably arranged inside the rotating part; a pressing part is slidably arranged through the top of the rotating part; the swinging part comprises a fixed shell; an air intake pipe, a receiving pipe, an exhaust pipe and a feeding pipe are evenly connected and arranged on the outer peripheral side of the fixed shell in sequence; the air intake pipe and the exhaust pipe are coaxially arranged; the receiving pipe and the feeding pipe are coaxially arranged; an annular cavity is provided on the inner peripheral side of the fixed shell; the rotating part comprises a rotating plate rotatably arranged inside the annular cavity; a placement cavity compatible with the plate-type denitration catalyst is provided inside the rotating plate; the plate-type denitration catalyst comprises three groups of coaxially arranged denitration catalyst blocks.

[0007] The present invention is further configured as follows: the mixing and conveying part includes a mixing box; an air intake cylinder fixedly connected to the exhaust pipe of the combined cycle unit is fixed on the top of the mixing box; a plurality of air outlet pipes are evenly connected and arranged on the peripheral side of the air intake cylinder; a branch pipe is evenly and obliquely connected and arranged on the outer peripheral side of the mixing box; each branch pipe is connected to the air outlet pipe by a high-temperature resistant connecting hose; an ammonia delivery pipe is evenly and obliquely connected and arranged on the outer peripheral side of the mixing box.

[0008] The present invention is further configured as follows: an inner vertical pipe is provided at the bottom of the mixing box; a coaxial outer vertical pipe is provided on the outer peripheral side of the inner vertical pipe; an air delivery cavity is formed between the inner vertical pipe and the outer vertical pipe; a plurality of filter holes are evenly provided on the peripheral side of the inner vertical pipe; a mounting base is fixed to the bottom of the air delivery cavity; a transfer box is fixedly installed on the bottom of the mounting base by fastening bolts; a plug-in tube is evenly provided through the top of the transfer box; plug-in holes that are plug-in-matched with the plug-in tube are evenly provided on the inner bottom surface of the air delivery cavity; a plurality of connecting tubes are evenly provided on the peripheral side of the transfer box; the connecting tubes are fixedly connected to the corresponding air inlet pipes by connecting flanges.

[0009] The present invention is further configured as follows: a reciprocating screw extending into the inner vertical tube is rotatably provided on the inner bottom surface of the mixing box; an impeller is fixedly installed on the peripheral side surface of the reciprocating screw near its top end; a sliding rod is symmetrically fixed to the bottom of the mixing box; a sliding sleeve matching it is provided on the reciprocating screw; a lifting plate slidably matched with the sliding rod is symmetrically fixed to the peripheral side surface of the sliding sleeve; a lifting ring coaxial with the reciprocating screw is fixed between the ends of the two lifting plates; a number of bristles are evenly arranged on the outer peripheral side surface of the lifting ring; a square column is fixed to the bottom end of the reciprocating screw; a connecting shaft is rotatably provided on the top of the transfer box; a square groove which is plug-matched with the square column is provided on the top of the connecting shaft; a stirring shaft is fixed to the bottom end of the connecting shaft; and a number of stirring rods are evenly fixed to the peripheral side surface of the stirring shaft.

[0010] The present invention is further configured as follows: the fixing frame includes a U-shaped seat; both ends of the U-shaped seat are fixed with collars; the outer peripheral sides of the intake pipe and the exhaust pipe are provided with annular grooves that rotate with the collars; an L-shaped plate is fixed to the side of the U-shaped seat; a support ring is fixed to the end of the L-shaped plate; a mounting tube is fixed to the inner wall of the support ring; one end of the mounting tube is fixedly connected to the connecting tube by a connecting flange; a high-temperature resistant delivery hose is fixed to the other end of the mounting tube; one end of the high-temperature resistant delivery hose is fixedly connected to the intake pipe by a connecting flange.

[0011] The present invention is further configured as follows: a U-shaped plate is fixed to the inner bottom surface of the U-shaped seat; an arc-shaped tube coaxial with the air intake pipe is fixed to the side surface of the U-shaped seat; an extension tube is connected to the end of the storage tube; a first arc-shaped rod that slides with the arc-shaped tube is fixed to the peripheral side of the extension tube; an arc spring is fixed between the first arc-shaped rod and the inner bottom surface of the arc-shaped tube; a first electromagnetic suction cup is fixedly installed on the top of the U-shaped plate; slide grooves are symmetrically provided on both sides of the inner wall of the U-shaped plate; a guide rod is fixed between the inner walls of the slide grooves; a lifting strip is slidably arranged between the two guide rods; a first iron block is fixed on the top of the lifting strip; a guide rope tube connected with the arc-shaped tube is penetrated by the inner bottom surface of the U-shaped seat; a connecting rope passing through the guide rope tube is connected between the bottom end of the first arc-shaped rod and the bottom surface of the lifting strip.

[0012] The present invention is further configured as follows: support plates are fixed to the outer peripheral sides of the air inlet pipe and the air outlet pipe; a second arc-shaped rod coaxial with the air inlet pipe is fixed to the side of the support plate; a squeezing ball is fixed to the end of the second arc-shaped rod; an extension plate is fixed to the peripheral side of the sleeve ring; a ball seat matched with the squeezing ball is fixed to the end of the extension plate; an elastic air bag is arranged on the top of the ball seat, and a first air guide pipe is connected to the bottom thereof; first annular sealing grooves are provided on the outer peripheral side of the rotating plate at both ends of the placement cavity; second annular sealing grooves coaxial with the air inlet pipe are symmetrically provided on the inner peripheral side of the annular cavity; an elastic diaphragm is arranged at the end of the second annular sealing groove; a second air guide pipe is penetrated through the inner wall of the second annular sealing groove; the first air guide pipe and the second air guide pipe are connected by a hose.

[0013] The present invention is further configured as follows: a microcontroller, a warning light and an alarm are installed on the top of the fixed shell in sequence; a support plate is installed on the top of the fixed shell; a micromotor is installed on the top of the support plate; a gear is fixed to the output end of the micromotor; a gear ring meshing with the gear is fixed to the top of the rotating plate; a nitrogen oxide flue gas monitor is arranged inside the exhaust pipe; the pressing part includes a connecting plate; ear plates are symmetrically fixed to the side of the connecting plate; a support spring is fixed between the ear plate and the top of the rotating plate; a fixing plate is fixed to the side of the connecting plate between the two ear plates; the fixing plate A second electromagnetic suction cup is fixedly installed on the ground; a second iron block is fixed on the top of the rotating plate; a number of vertical rods are evenly fixed on the bottom surface of the connecting plate; a piston plate is fixed on the end of the vertical rod; a pressure block is fixed on the bottom of the piston plate; a number of piston cavities that slide with the piston plate are evenly opened on the top of the rotating plate; a sliding hole that slides with the vertical rod is opened on the top of the piston cavity; guide grooves are opened on the inner sides of the feeding pipe, the placement cavity and the storage tube; a slider that slides with the guide groove is fixed on the outer side of the denitration catalyst block, and a slot that plugs into the pressure block is opened on the outer side.

[0014] The present invention is further configured as follows: an electromagnetic coil is fixedly installed inside the extension tube; a top column is slidably arranged inside the extension tube; a reset spring is fixed between the top column and the extension tube; a connecting column is fixed at one end of the top column; an armature column is fixed at the end of the connecting column; the input end of the microcontroller is electrically connected to the nitrogen oxide flue gas monitor, and its output end is respectively electrically connected to the micromotor, the first electromagnetic suction cup, the second electromagnetic suction cup, the electromagnetic coil, the warning light and the alarm; an ear seat is fixed at the end of the extension tube; a threaded sleeve is penetrated through the side of the ear seat; a top rod through which the storage tube slides is provided for rotation inside the threaded sleeve.

[0015] The advantages of the present invention are: 1. The present invention improves the flue gas denitrification efficiency and denitrification effect by sending the flue gas and ammonia into the mixing box through the corresponding branch pipes and the ammonia delivery pipe respectively, and after preliminary mixing, they enter the transfer box for further mixing, and then are sent to the corresponding denitrification components through each group of connecting pipes to react with the plate-type denitrification catalyst.

[0016] 2. The present invention changes the positions of the three groups of denitration catalyst blocks in sequence through the linkage between the various components, which not only ensures that the denitration catalyst blocks at the front and rear ends of the plate-type denitration catalyst are in full contact with the flue gas, but also ensures that the denitration catalyst blocks in the middle are in full contact with the flue gas, thereby improving the utilization rate of the plate-type denitration catalyst to reduce waste. The replacement process between the denitration catalyst blocks is highly automated, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a denitration system for a 100MW-class combined cycle unit of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the mixing and conveying part of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the mixing and conveying part of the present invention from a front view perspective.

[0020] Figure 4 For the present invention Figure 3 A magnified image of area A.

[0021] Figure 5 It is a schematic diagram of the structure of the denitration component of the present invention.

[0022] Figure 6 For the present invention Figure 5 A magnified view of area B.

[0023] Figure 7 It is a schematic structural diagram of the denitration component of the present invention from another angle.

[0024] Figure 8 It is a schematic structural diagram of the fixing frame of the present invention.

[0025] Fig. 9 It is a structural schematic diagram of the swing part of the present invention.

[0026] Fig.10 It is a schematic structural diagram of the rotating part of the present invention.

[0027] Fig.11 It is a schematic structural diagram of the plate-type denitration catalyst of the present invention.

[0028] Fig.12 It is a schematic structural diagram of the pressing part of the present invention.

[0029] Fig.13 It is a schematic structural diagram of the top column of the present invention.

[0030] Fig.14 It is a structural schematic diagram of the replacement process of the denitration catalyst block inside the denitration assembly of the present invention.

[0031] Fig.15 It is a schematic diagram of the position replacement of the denitration catalyst block of the present invention.

[0032] In the figure: 1. Mixing and conveying part; 2. Denitration component; 3. Fixed frame; 4. Swinging part; 5. Rotating part; 6. Plate-type denitration catalyst; 7. Pressing part; 8. Fixed shell; 9. Inlet pipe; 10. Storage pipe; 11. Exhaust pipe; 12. Feeding pipe; 13. Annular cavity; 14. Turntable; 15. Placement cavity; 16. Denitration catalyst block; 17. Mixing box; 18. Exhaust pipe; 19. Branch pipe; 20. Ammonia delivery pipe; 21. Inner vertical pipe; 22. Outer vertical pipe; 23. Gas delivery cavity; 24. Filter hole; 25. Installation bottom plate ; 26, transfer box; 27, plug-in tube; 28, plug-in hole; 29, connecting tube; 30, reciprocating screw; 31, sliding rod; 32, sliding sleeve; 33, lifting plate; 34, lifting ring; 35, brush; 36, square column; 37, connecting shaft; 38, square groove; 39, stirring shaft; 40, stirring rod; 41, U-shaped seat; 42, collar; 43, annular groove; 44, L-shaped plate; 45, support ring; 46, installation tube; 47, high temperature resistant conveying hose; 48, U-shaped plate; 49, arc tube; 50, extension tube; 51 , first arc rod; 52, arc spring; 53, first electromagnetic suction cup; 54, slide groove; 55, guide rod; 56, first iron block; 57, guide rope tube; 58, connecting rope; 59, support plate; 60, second arc rod; 61, squeeze ball; 62, extension plate; 63, ball seat; 64, elastic airbag; 65, first air guide tube; 66, first annular sealing groove; 67, second annular sealing groove; 68, second air guide tube; 69, microcontroller; 70, warning light; 71, support plate; 72, micro motor; 73, gear ; 74. gear ring; 75. connecting plate; 76. ear plate; 77. supporting spring; 78. fixing plate; 79. second electromagnetic suction cup; 80. second iron block; 81. vertical rod; 82. piston plate; 83. pressure block; 84. piston chamber; 85. sliding hole; 86. guide groove; 87. slider; 88. slot; 89. electromagnetic coil; 90. push column; 91. reset spring; 92. connecting column; 93. armature column; 94. air intake pipe; 95. lifting strip; 96. alarm; 97. ear seat; 98. threaded sleeve; 99. push rod. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0036] For example, see Figure 1-15 , the present invention provides the following technical solutions: A denitration system for a 100MW combined cycle unit, specifically, comprises a mixing and conveying part 1 connected to a smoke exhaust pipe of the combined cycle unit; a plurality of denitration components 2 are evenly and fixedly mounted on the mixing and conveying part 1; the denitration components 2 comprise a fixed frame 3, a swinging part 4 rotatably arranged on the fixed frame 3, and a rotating part 5 rotatably arranged inside the swinging part 4; a plate-type denitration catalyst 6 is slidably arranged inside the rotating part 5; a pressing part 7 is slidably arranged through the top of the rotating part 5; the swinging part 4 comprises a fixed shell 8; the fixed shell An air intake pipe 9, a receiving pipe 10, an exhaust pipe 11 and a feeding pipe 12 are evenly connected in sequence on the outer peripheral side of 8; the air intake pipe 9 and the exhaust pipe 11 are coaxially arranged; the receiving pipe 10 and the feeding pipe 12 are coaxially arranged; an annular cavity 13 is provided on the inner peripheral side of the fixed shell 8; the rotating part 5 includes a rotating plate 14 rotatably arranged inside the annular cavity 13; a placement cavity 15 adapted to the plate-type denitration catalyst 6 is provided inside the rotating plate 14; the plate-type denitration catalyst 6 includes three groups of denitration catalyst blocks 16 coaxially arranged.

[0037] Working principle of the first embodiment: The denitration catalyst block 16 is based on a metal mesh pressed from a stainless steel plate. A mixture of TiO2, V2O5, etc. is adhered to the stainless steel mesh. After pressing and calcining, three groups of denitration catalyst blocks 16 are coaxially placed together to form a plate-type denitration catalyst 6, which is convenient for the subsequent replacement of the positions of the three groups of denitration catalyst blocks 16.

[0038] The flue gas and ammonia are sent into the mixing and conveying part 1 for sufficient mixing and then sent into the denitration component 2 to remove nitrogen oxides in the flue gas together with the plate-type denitration catalyst 6, and the flue gas is denitrated; through the linkage between the various components, the positions of the three groups of denitration catalyst blocks 16 are changed in turn, which not only ensures that the denitration catalyst blocks 16 at the front and rear ends of the plate-type denitration catalyst 6 are fully in contact with the flue gas, but also ensures that the denitration catalyst block 16 in the middle position is fully in contact with the flue gas, thereby improving the utilization rate of the plate-type denitration catalyst 6 to reduce waste.

[0039] For example 2, please refer to Figure 1-15The second embodiment makes the following improvements on the basis of the first embodiment. Specifically, the mixing and conveying part 1 includes a mixing box 17; an air inlet cylinder 94 fixedly connected to the exhaust pipe of the combined cycle unit is fixed on the top of the mixing box 17; a plurality of air outlet pipes 18 are evenly connected and arranged on the side surface of the air inlet cylinder 94; branch pipes 19 are evenly and obliquely connected and arranged on the outer side surface of the mixing box 17; each branch pipe 19 is connected to the air outlet pipe 18 by a high-temperature resistant connecting hose; an ammonia conveying pipe 20 is evenly and obliquely connected and arranged on the outer side surface of the mixing box 17.

[0040] An inner vertical pipe 21 is provided at the bottom of the mixing box 17; a coaxial outer vertical pipe 22 is provided on the outer peripheral side of the inner vertical pipe 21; an air delivery cavity 23 is formed between the inner vertical pipe 21 and the outer vertical pipe 22; a plurality of filter holes 24 are evenly provided on the peripheral side of the inner vertical pipe 21; a mounting base plate 25 is fixed to the bottom of the air delivery cavity 23; a transfer box 26 is fixedly installed on the bottom of the mounting base plate 25 by fastening bolts; a plug-in tube 27 is evenly provided through the top of the transfer box 26; plug-in holes 28 for plugging with the plug-in tube 27 are evenly provided on the inner bottom surface of the air delivery cavity 23; a plurality of connecting tubes 29 are evenly provided on the peripheral side of the transfer box 26; the connecting tube 29 is fixedly connected to the corresponding air inlet pipe 9 by a connecting flange.

[0041] A reciprocating screw 30 extending into the inner vertical pipe 21 is rotatably provided on the inner bottom surface of the mixing box 17; an impeller is fixedly installed on the side surface of the reciprocating screw 30 near its top; a sliding rod 31 is symmetrically fixed to the bottom of the mixing box 17; a sliding sleeve 32 matching it is provided on the reciprocating screw 30; a lifting plate 33 slidingly matched with the sliding rod 31 is symmetrically fixed on the side surface of the sliding sleeve 32; a lifting ring 34 coaxial with the reciprocating screw 30 is fixed between the ends of the two lifting plates 33; a number of bristles 35 are evenly provided on the outer side surface of the lifting ring 34; a square column 36 is fixed to the bottom end of the reciprocating screw 30; a connecting shaft 37 is rotatably provided on the top of the transfer box 26; a square groove 38 plug-matched with the square column 36 is provided on the top of the connecting shaft 37; a stirring shaft 39 is fixed to the bottom end of the connecting shaft 37; and a number of stirring rods 40 are evenly fixed on the side surface of the stirring shaft 39.

[0042] The fixing frame 3 includes a U-shaped seat 41; both ends of the U-shaped seat 41 are fixed with collars 42; the outer peripheral sides of the intake pipe 9 and the exhaust pipe 11 are provided with annular grooves 43 that rotate with the collars 42; an L-shaped plate 44 is fixed to the side of the U-shaped seat 41; a support ring 45 is fixed to the end of the L-shaped plate 44; a mounting tube 46 is fixed to the inner wall of the support ring 45; one end of the mounting tube 46 is fixedly connected to the connecting tube 29 through a connecting flange; a high-temperature resistant delivery hose 47 is fixed to the other end of the mounting tube 46; one end of the high-temperature resistant delivery hose 47 is fixedly connected to the intake pipe 9 through a connecting flange.

[0043] Working principle of the second embodiment: By fixing the air inlet cylinder 94 on the exhaust pipe of the combined cycle unit, the flue gas generated by the combined cycle unit enters the mixing box 17 through the air inlet cylinder 94, the exhaust pipe 18, the high temperature resistant connecting hose and the branch pipe 19 in sequence. At the same time, ammonia enters the mixing box 17 through each group of ammonia delivery pipes 20. The flow of ammonia and flue gas drives the impeller to rotate, thereby improving the mixing effect and driving the reciprocating screw 30 to rotate. A slider 87 adapted to the reciprocating screw 30 is arranged inside the sliding sleeve 32. The reciprocating screw 30 is a form of a three-dimensional cam pair, which is manifested as two thread grooves with the same pitch and opposite rotation directions, and the two ends are connected by a transition curve. Through the rotation of the reciprocating screw 30, the side of the spiral groove pushes the position The slider 87 in the spiral groove makes axial reciprocating motion, thereby driving the lifting plate 33 and the lifting ring 34 to make reciprocating lifting motion along the slide rod 31, thereby driving the bristles 35 to clean the inner wall of the inner vertical pipe 21 to prevent the filter hole 24 from being blocked. The mixed gas filtered by the inner vertical pipe 21 enters the gas delivery cavity 23, and then enters the transfer box 26 through the plug-in tube 27. The rotation of the reciprocating screw 30 drives the stirring shaft 39 and the stirring rod 40 to rotate synchronously to further stir the mixed gas. The fully stirred and mixed mixed gas enters the corresponding air intake pipe 9 through each group of connecting pipes 29, and reacts with the corresponding plate-type denitrification catalyst 6 in each group of denitrification components 2 to complete the denitrification operation.

[0044] For example 3, please refer to Figure 1-15 , the third embodiment is improved on the basis of the second embodiment as follows. Specifically, a U-shaped plate 48 is fixed to the inner bottom surface of the U-shaped seat 41; an arc tube 49 coaxial with the air intake pipe 9 is fixed to the side surface of the U-shaped seat 41; an extension tube 50 is connected to the end of the storage tube 10; a first arc rod 51 slidingly matched with the arc tube 49 is fixed to the side surface of the extension tube 50; an arc spring 52 is fixed between the first arc rod 51 and the inner bottom surface of the arc tube 49; a first electromagnetic suction cup 53 is fixedly installed on the top of the U-shaped plate 48; slide grooves 54 are symmetrically opened on both sides of the inner wall of the U-shaped plate 48; a guide rod 55 is fixed between the inner walls of the slide grooves 54; a lifting bar 95 is slidably arranged between the two guide rods 55; a first iron block 56 is fixed to the top of the lifting bar 95; a guide rope tube 57 communicating with the arc tube 49 is penetrated through the inner bottom surface of the U-shaped seat 41; a connecting rope 58 passing through the guide rope tube 57 is connected between the bottom end of the first arc rod 51 and the bottom surface of the lifting bar 95.

[0045] Support plates 59 are fixed to the outer side surfaces of the air inlet pipe 9 and the air outlet pipe 18; a second arc-shaped rod 60 coaxial with the air inlet pipe 9 is fixed to the side surface of the support plate 59; a squeezing ball 61 is fixed to the end of the second arc-shaped rod 60; an extension plate 62 is fixed to the outer side surface of the collar 42; a ball seat 63 matched with the squeezing ball 61 is fixed to the end of the extension plate 62; an elastic air bag 64 is arranged on the top of the ball seat 63, and a first air guide pipe 65 is connected to the bottom thereof; first annular sealing grooves 66 are provided on the outer side surfaces of the rotating plate 14 at both ends of the placement cavity 15; second annular sealing grooves 67 coaxial with the air inlet pipe 9 are symmetrically provided on the inner side surfaces of the annular cavity 13; an elastic diaphragm is arranged at the end of the second annular sealing groove 67; a second air guide pipe 68 is penetrated through the inner wall of the second annular sealing groove 67; the first air guide pipe 65 and the second air guide pipe 68 are connected by a hose.

[0046] A microcontroller 69, a warning light 70 and an alarm 96 are installed in sequence on the top of the fixed shell 8; a support plate 71 is installed on the top of the fixed shell 8; a micro motor 72 is installed on the top of the support plate 71; a gear 73 is fixed to the output end of the micro motor 72; a gear ring 74 meshing with the gear 73 is fixed to the top of the rotating plate 14; a nitrogen oxide flue gas monitor is arranged inside the exhaust pipe 18.

[0047] The clamping part 7 includes a connecting plate 75; an ear plate 76 is symmetrically fixed to the side of the connecting plate 75; a supporting spring 77 is fixed between the ear plate 76 and the top of the rotating plate 14; a fixing plate 78 is fixed to the side of the connecting plate 75 between the two ear plates 76; a second electromagnetic suction cup 79 is fixedly installed on the ground of the fixing plate 78; a second iron block 80 is fixed to the top of the rotating plate 14; a number of vertical rods 81 are evenly fixed to the bottom of the connecting plate 75; a piston plate 82 is fixed to the end of the vertical rod 81; a pressing block 83 is fixed to the bottom of the piston plate 82; a number of piston cavities 84 that slide with the piston plate 82 are evenly opened at the top of the rotating plate 14; a sliding hole 85 that slides with the vertical rod 81 is opened at the top of the piston cavity 84; guide grooves 86 are opened on the inner peripheral sides of the feeding pipe 12, the placement cavity 15 and the storage tube 10; a slider 87 that slides with the guide groove 86 is fixed to the outer peripheral side of the denitration catalyst block 16, and a slot 88 that plugs and cooperates with the pressing block 83 is opened on its outer peripheral side.

[0048] An electromagnetic coil 89 is fixedly installed inside the extension tube 50; a top column 90 is slidably arranged inside the extension tube 50; a return spring 91 is fixed between the top column 90 and the extension tube 50; a connecting column 92 is fixed at one end of the top column 90; an armature column 93 is fixed at the end of the connecting column 92; the input end of the microcontroller 69 is electrically connected to the nitrogen oxide flue gas monitor, and its output end is electrically connected to the micromotor 72, the first electromagnetic suction cup 53, the second electromagnetic suction cup 79, the electromagnetic coil 89, the warning light 70 and the alarm 96 respectively; an ear seat 97 is fixed at the end of the extension tube 50; a threaded sleeve 98 is penetrated through the side of the ear seat 97; a top rod 99 that slides through the storage tube 10 is rotatably arranged inside the threaded sleeve 98.

[0049] Working principle of the third embodiment: In the initial state, the denitration catalyst block 16 in direct contact with the intake pipe 9 is 16 (1), the denitration catalyst block 16 located in the middle is 16 (2), and the denitration catalyst block 16 in direct contact with the exhaust pipe 11 is 16 (3); in the initial state, the plate-type denitration catalyst 6 is coaxially arranged with the intake pipe 9 and the exhaust pipe 11, and the three groups of denitration catalyst blocks 16 are arranged in the direction from the intake pipe 9 to the exhaust pipe 11 as 16 (1) → 16 (2) → 16 (3).

[0050] The nitrogen oxide flue gas monitor monitors the nitrogen oxide content in the flue gas discharged from the exhaust pipe 18 in real time. When the nitrogen oxide flue gas monitor detects that the nitrogen oxide content in the exhaust flue gas is close to the warning value, the microcontroller 69 controls the warning light 70 to flash and the alarm 96 to sound an alarm to alert the staff. The corresponding microcontroller 69 controls the closing of the solenoid valve on the air intake cylinder 94 and the solenoid valve on the ammonia delivery pipe 20, and at the same time controls the second electromagnetic suction cup 79 to be energized to attract the second iron block 80, and the support spring 77 is stretched, so that each group of pressure blocks 83 is pulled out from the corresponding slot 88, thereby releasing the fixed restriction on the plate denitrification catalyst 6.

[0051] The microcontroller 69 controls the first electromagnetic suction cup 53 to be electrically attracted to the first iron block 56, and pulls the first arc rod 51 through the connecting rope 58. The arc spring 52 is compressed, driving the swing part 4 to rotate around the ring 42, so that the feeding tube 12 is tilted upward. During this process, the squeezing ball 61 gradually disengages from the ball seat 63, releasing the pressure on the elastic airbag 64, and the elastic airbag 64 elastically resets, and the elastic diaphragm elastically resets and disengages from the first annular sealing groove 66, releasing the sealing connection between the swing part 4 and the rotating part 5.

[0052] The microcontroller 69 controls the micromotor 72 to start and drive the gear 73 to rotate, and drives the gear ring 74 to rotate, so that the rotating part 5 rotates 90 degrees, so that the placement chamber 15 rotates to be coaxial with the storage tube 10, 16 (3) rotates to be close to the feeding tube 12, 16 (1) slides into the storage tube 10, and points from the feeding tube 12 to the storage tube 10. The three groups of denitration catalyst blocks 16 are arranged in the order of 16 (3) → 16 (2) → 16 (1) ( Fig.14 As shown in (a), the micro motor 72 is controlled to start and drive the gear ring 74 to continue to rotate 180° in the opposite direction so that 16 (2) rotates to the position close to the feeding tube 12, and 16 (2) and 16 (3) slide down along the placement cavity 15. At this time, the direction from the feeding tube 12 to the receiving tube 10 ( Fig.14 As shown in (b), the three groups of denitration catalyst blocks 16 are arranged in the order of 16 (2) → 16 (3) → 16 (1), the electromagnetic coil 89 is controlled to lose power, and under the elastic reset force of the reset spring 91, the push column 90 is driven to be inserted into the storage box 10, and the 16 (1) in the storage box 10 is pushed out and slid into the placement cavity 15; the micro motor 72 is controlled to drive the rotating part 5 to continue to rotate 90°. At this time, the placement cavity 15 is coaxially arranged with the intake pipe 9 ( Fig.14 As shown in (c), from the direction of the intake pipe 9 to the exhaust pipe 11, the three groups of denitration catalyst blocks 16 are arranged as 16 (2) → 16 (3) → 16 (1), so that 16 (2) located in the middle position in the initial state is in direct contact with the intake pipe 9, and the first electromagnetic suction cup 53 is controlled to lose power. Under the elastic force of the arc spring 52, the swing part 4 is driven to rotate in the opposite direction and reset. At the same time, the second electromagnetic suction cup 79 is controlled to lose power. Under the elastic reset force of the support spring 77, the pressing block 83 is driven to be inserted into the slot 88 on the corresponding denitration catalyst block 16, thereby completing the fixation of the denitration catalyst block 16 and improving its stability. In this process, the squeezing ball 61 gradually squeezes the elastic airbag 64, thereby sending the air in the elastic airbag 64 into the second annular sealing groove 67 through the second air guide pipe 68, so that the corresponding elastic diaphragm is inflated and expanded to enter the first annular sealing groove 66, thereby realizing the sealed connection between the two ends of the placement cavity 15 and the intake pipe 9 and the exhaust pipe 11.

[0053] The nitrogen oxide flue gas monitor monitors the nitrogen oxide content in the flue gas discharged from the exhaust pipe 18 in real time. When the nitrogen oxide flue gas monitor detects that the nitrogen oxide content in the exhaust flue gas is close to the warning value, the above operation is repeated to complete the exchange of the positions of the three groups of denitration catalyst blocks 16, from the intake pipe 9 to the exhaust pipe 11. The three groups of denitration catalyst blocks 16 are arranged in the order of 16 (3) → 16 (1) → 16 (2).

[0054] After the three groups of denitration catalyst blocks 16 have directly contacted and reacted with the mixed gas discharged from the intake pipe 9, the plate-type denitration catalyst 6 needs to be replaced. After controlling the swing part 4 to rotate and tilt together with the rotating part 5, control the rotating part 5 to rotate 90° so that the placement cavity 15 and the storage tube 10 are coaxially arranged, and the top rod 99 is rotated to make it rotate and slide into the storage tube 10 and the placement cavity 15 in turn, and the three groups of denitration catalyst blocks 16 are pushed out from the feeding pipe 12, and then three new groups of denitration catalyst blocks 16 are added through the feeding pipe 12.

[0055] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A denitration system for a 100MW combined cycle unit, comprising a mixing and conveying section (1) connected to a smoke exhaust pipe of the combined cycle unit; characterized in that: A plurality of denitration components (2) are evenly fixedly mounted on the mixing and conveying portion (1); the denitration component (2) comprises a fixed frame (3), a swinging portion (4) rotatably arranged on the fixed frame (3), and a rotating portion (5) rotatably arranged inside the swinging portion (4); a plate-type denitration catalyst (6) is slidably arranged inside the rotating portion (5); a pressing portion (7) is slidably arranged through the top of the rotating portion (5); The swinging part (4) comprises a fixed shell (8); an air intake pipe (9), a storage pipe (10), an exhaust pipe (11) and a feeding pipe (12) are evenly connected and arranged in sequence on the outer peripheral side surface of the fixed shell (8); the air intake pipe (9) and the exhaust pipe (11) are coaxially arranged; the storage pipe (10) and the feeding pipe (12) are coaxially arranged; An annular cavity (13) is provided on the inner circumferential side of the fixed shell (8); the rotating portion (5) comprises a rotating plate (14) rotatably arranged inside the annular cavity (13); a placement cavity (15) adapted for a plate-type denitration catalyst (6) is provided inside the rotating plate (14); the plate-type denitration catalyst (6) comprises three groups of coaxially arranged denitration catalyst blocks (16).

2. The denitration system for a 100MW combined cycle unit according to claim 1, characterized in that: The mixing and conveying section (1) comprises a mixing box (17); an air intake cylinder (94) fixedly connected to a smoke exhaust pipe of a combined cycle unit is fixed on the top of the mixing box (17); a plurality of air outlet pipes (18) are evenly connected and arranged on the circumferential side of the air intake cylinder (94); branch pipes (19) are evenly connected and arranged on the outer circumferential side of the mixing box (17); each branch pipe (19) is connected to the air outlet pipe (18) via a high temperature resistant connecting hose; and an ammonia conveying pipe (20) is evenly connected and arranged on the outer circumferential side of the mixing box (17).

3. The denitration system for a 100MW combined cycle unit according to claim 2, characterized in that: The bottom of the mixing box (17) is connected to an inner vertical pipe (21); a coaxial outer vertical pipe (22) is arranged on the outer peripheral side of the inner vertical pipe (21); a gas transmission cavity (23) is formed between the inner vertical pipe (21) and the outer vertical pipe (22); a plurality of filter holes (24) are evenly arranged on the peripheral side of the inner vertical pipe (21); A mounting base plate (25) is fixed to the bottom of the gas delivery cavity (23); a transfer box (26) is fixedly mounted to the bottom of the mounting base plate (25) by means of fastening bolts; a plug-in tube (27) is evenly penetrated and connected to the top of the transfer box (26); plug-in holes (28) for plugging and matching with the plug-in tube (27) are evenly opened on the inner bottom surface of the gas delivery cavity (23); a plurality of connecting tubes (29) are evenly connected to the peripheral side surface of the transfer box (26); the connecting tube (29) is fixedly connected to the corresponding air inlet pipe (9) by means of a connecting flange.

4. The denitration system for a 100MW combined cycle unit according to claim 3, characterized in that: A reciprocating screw (30) is rotatably disposed on the inner bottom surface of the mixing box (17) and extends into the interior of the inner vertical tube (21); an impeller is fixedly mounted on the peripheral side surface of the reciprocating screw (30) near the top thereof; a sliding rod (31) is symmetrically fixed to the bottom of the mixing box (17); a sliding sleeve (32) matching the reciprocating screw (30) is disposed on the reciprocating screw (30); a lifting plate (33) slidably matched with the sliding rod (31) is symmetrically fixed to the peripheral side surface of the sliding sleeve (32); a lifting ring (34) coaxial with the reciprocating screw (30) is fixed between the ends of the two lifting plates (33); a plurality of brushes (35) are evenly disposed on the peripheral side surface of the lifting ring (34); A square column (36) is fixed to the bottom end of the reciprocating screw rod (30); a connecting shaft (37) is rotatably provided through the top of the transfer box (26); a square groove (38) is provided at the top end of the connecting shaft (37) for plugging and cooperating with the square column (36); a stirring shaft (39) is fixed to the bottom end of the connecting shaft (37); and a plurality of stirring rods (40) are evenly fixed to the side surface of the stirring shaft (39).

5. A denitration system for a 100MW combined cycle unit according to claim 4, characterized in that: The fixing frame (3) comprises a U-shaped seat (41); collars (42) are fixed at both ends of the U-shaped seat (41); an annular groove (43) rotatably matched with the collar (42) is formed on the outer peripheral side surfaces of the air intake pipe (9) and the exhaust pipe (11); an L-shaped plate (44) is fixed to the side surface of the U-shaped seat (41); a support ring (45) is fixed to the end of the L-shaped plate (44); a mounting tube (46) is fixed to the inner wall of the support ring (45); one end of the mounting tube (46) is fixedly connected to the connecting tube (29) via a connecting flange; a high temperature resistant delivery hose (47) is fixed to the other end of the mounting tube (46); one end of the high temperature resistant delivery hose (47) is fixedly connected to the air intake pipe (9) via a connecting flange.

6. A denitration system for a 100MW combined cycle unit according to claim 5, characterized in that: A U-shaped plate (48) is fixed to the inner bottom surface of the U-shaped seat (41); an arc-shaped tube (49) coaxial with the air intake pipe (9) is fixed to the side surface of the U-shaped seat (41); an extension tube (50) is provided at the end of the storage tube (10); a first arc-shaped rod (51) slidably engaged with the arc-shaped tube (49) is fixed to the circumferential side surface of the extension tube (50); an arc-shaped spring (52) is fixed between the first arc-shaped rod (51) and the inner bottom surface of the arc-shaped tube (49); A first electromagnetic suction cup (53) is fixedly mounted on the top of the U-shaped plate (48); sliding grooves (54) are symmetrically provided on both sides of the inner wall of the U-shaped plate (48); a guide rod (55) is fixed between the inner walls of the sliding grooves (54); a lifting bar (95) is slidably arranged between the two guide rods (55); a first iron block (56) is fixed on the top of the lifting bar (95); a guide rope tube (57) communicating with the arc tube (49) is penetrated through the inner bottom surface of the U-shaped seat (41); a connecting rope (58) passing through the guide rope tube (57) is connected between the bottom end of the first arc rod (51) and the bottom surface of the lifting bar (95).

7. A denitration system for a 100MW combined cycle unit according to claim 6, characterized in that: The air inlet pipe (9) and the air outlet pipe (18) are both fixed with support plates (59) on the outer circumference side; a second arc-shaped rod (60) coaxial with the air inlet pipe (9) is fixed on the side of the support plate (59); a squeezing ball (61) is fixed at the end of the second arc-shaped rod (60); an extension plate (62) is fixed on the circumference side of the collar (42); a ball seat (63) matched with the squeezing ball (61) is fixed at the end of the extension plate (62); an elastic air bag (64) is arranged at the top of the ball seat (63), and a first air guide pipe (65) is arranged at the bottom thereof in communication; The outer circumferential side surface of the rotating plate (14) is provided with first annular sealing grooves (66) at both ends of the placement cavity (15); the inner circumferential side surface of the annular cavity (13) is symmetrically provided with second annular sealing grooves (67) coaxial with the air inlet pipe (9); an elastic diaphragm is provided at the end of the second annular sealing groove (67); a second air guide pipe (68) is provided through the inner wall of the second annular sealing groove (67); and the first air guide pipe (65) and the second air guide pipe (68) are connected via a hose.

8. The denitration system for a 100MW combined cycle unit according to claim 7, characterized in that: A microcontroller (69), a warning light (70), and an alarm (96) are sequentially mounted on the top of the fixed shell (8); a support plate (71) is mounted on the top of the fixed shell (8); a micromotor (72) is mounted on the top of the support plate (71); a gear (73) is fixed to the output end of the micromotor (72); a gear ring (74) meshing with the gear (73) is fixed to the top of the rotating plate (14); a nitrogen oxide flue gas monitor is arranged inside the exhaust pipe (18); The pressing portion (7) comprises a connecting plate (75); a lug plate (76) is symmetrically fixed to the side of the connecting plate (75); a supporting spring (77) is fixed between the lug plate (76) and the top of the rotating plate (14); a fixing plate (78) is fixed to the side of the connecting plate (75) between the two lug plates (76); a second electromagnetic suction cup (79) is fixedly mounted on the ground of the fixing plate (78); and a second iron block (80) is fixed to the top of the rotating plate (14); A plurality of vertical rods (81) are evenly fixed to the bottom surface of the connecting plate (75); a piston plate (82) is fixed to the end of the vertical rod (81); a pressure block (83) is fixed to the bottom of the piston plate (82); a plurality of piston cavities (84) that are slidably matched with the piston plate (82) are evenly opened on the top of the rotating plate (14); a sliding hole (85) that is slidably matched with the vertical rod (81) is opened on the top of the piston cavity (84); a guide groove (86) is opened on the inner circumferential side surface of the feeding pipe (12), the placement cavity (15) and the storage tube (10); a sliding block (87) that is slidably matched with the guide groove (86) is fixed to the outer circumferential side surface of the denitration catalyst block (16), and a slot (88) that is plug-matched with the pressure block (83) is opened on the outer circumferential side surface.

9. A denitration system for a 100MW combined cycle unit according to claim 8, characterized in that: An electromagnetic coil (89) is fixedly installed inside the extension tube (50); a top column (90) is slidably arranged inside the extension tube (50); a return spring (91) is fixed between the top column (90) and the extension tube (50); a connecting column (92) is fixed at one end of the top column (90); an armature column (93) is fixed at the end of the connecting column (92); an input end of the microcontroller (69) is electrically connected to the nitrogen oxide flue gas monitor, and an output end thereof is electrically connected to the micromotor (72), the first electromagnetic suction cup (53), the second electromagnetic suction cup (79), the electromagnetic coil (89), the warning light (70) and the alarm (96) respectively; An ear seat (97) is fixed at the end of the extension tube (50); a threaded sleeve (98) is provided through the side of the ear seat (97); and a push rod (99) is provided inside the threaded sleeve (98) and is slidably provided through the receiving tube (10).

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