Multi-stage combined SCR (Selective Catalytic Reduction) denitration device

Abstract

The utility model relates to the technical field of SCR (Selective Catalytic Reduction) denitration, in particular to a multistage combined SCR denitration device which comprises a box body, a filtering mechanism is arranged at the top end of the box body, a vertical pipe is fixed at the bottom end of the filtering mechanism, a gas inlet pipe is fixed at one end of the filtering mechanism, an ammonia gas pipe is arranged below the gas inlet pipe, and the bottom end of the vertical pipe extends into the box body and is fixedly provided with a transverse pipe. A plurality of nozzles are fixed at the bottom end of the transverse pipe, three branch pipes are fixed on one side of the ammonia gas pipe, a plurality of exhaust holes are formed in each branch pipe, three bearing seats are fixed in the box body, a connecting rod is fixed in one bearing seat, transverse rods are fixed in the other two bearing seats, and a plurality of shifting plates are fixed on the connecting rod and the two transverse rods. A first belt pulley is fixed to the connecting rod, second belt pulleys are fixed to the two cross rods, a support and an exhaust pipe are fixed to the side, away from the ammonia gas pipe, of the box body, and a motor is fixed to the support; the flue gas treatment device is beneficial to full mixing of flue gas and ammonia gas, and the treatment effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of SCR denitration, in particular to multistage combined SCR denitration device. BACKGROUND

[0002] SCR is selective catalytic reduction technology, which is widely used in denitration engineering. The SCR denitration process mainly consists of SCR catalytic reactor, ammonia injection system, flue gas bypass system, ammonia storage and preparation system, etc. At present, most of the denitration devices of boiler flue gas are connected to the exhaust pipe, and by spraying a certain concentration of reducing agent or reducing gas, the purpose of reducing nitrogen oxides in flue gas is achieved. The traditional SCR denitration device cannot ensure that ammonia gas and boiler flue gas are mixed quickly and fully, so that flue gas is not completely treated and discharged into the atmosphere with gas, and the flue gas treatment effect is not ideal. SUMMARY

[0003] In view of the problems in the prior art, the utility model provides a multistage combined SCR denitration device.

[0004] The utility model solves the technical scheme that the utility model adopts multistage combined SCR denitration device, including the box, the top of box is equipped with filter mechanism, the bottom of filter mechanism is fixed with standpipe, the one end of filter mechanism is fixed with inlet pipe, the below of inlet pipe is equipped with ammonia gas pipe, the bottom of standpipe extends to the box and is fixed with cross pipe, the bottom of cross pipe is fixed with a plurality of spray heads, the one side of ammonia gas pipe is fixed with three branch pipes, every branch pipe extends to the box, every branch pipe is equipped with a plurality of exhaust holes, the box is fixed with three bearing blocks, one bearing block is fixed with connecting rod, the other two bearing blocks are fixed with cross bar, connecting rod and two cross bars are fixed with a plurality of paddle, the end of connecting rod and two cross bars away from bearing block extends to the outside of box, connecting rod is fixed with first pulley, two cross bars are fixed with second pulley, the one side of box away from ammonia gas pipe is fixed with support and exhaust pipe, support is fixed with motor, the output shaft of motor is connected with connecting rod through coupling, the one side of support is equipped with two belts, one second pulley is connected with first pulley through one belt, the other second pulley is connected with first pulley through the other belt, the one side of box is equipped with three notches that communicate with the inside of box, every notch is equipped with outer frame, every outer frame is fixed with perforated plate, every outer frame is equipped with catalyst, the two symmetrical vertical inner walls of box are equipped with three sliding grooves that are matched with outer frame.

[0005] By adopting the technical scheme, the boiler flue gas is introduced into the box through the air inlet pipe, the filtering mechanism can filter the introduced boiler flue gas, the filtered boiler flue gas is sprayed downward through the multiple spray heads, the ammonia gas is introduced into the box through the ammonia gas pipe and the branch pipe, the multiple exhaust holes on the branch pipe are beneficial to the preliminary mixing of the boiler flue gas and the ammonia gas, the output shaft of the motor drives the connecting rod to rotate, the first belt pulley rotates, the two cross rods rotate together with the connecting rod under the cooperation of the two second belt pulleys and the belt, the cross rod, the connecting rod and the stirring plate rotate, the stirring plate can stir the airflow in the box, thereby facilitating the sufficient mixing of the boiler flue gas and the ammonia gas, and the catalyst is further used to complete the denitration of the flue gas, the flue gas treatment effect is improved, and the outer frame can be taken out of the box by pulling, so that the catalyst is convenient to replace.

[0006] Specifically, the filtering mechanism comprises an outer shell, a first filter screen and a second filter screen, one end of the outer shell is connected with the air inlet pipe, the other end of the outer shell is threadedly connected with a protective cover provided with a sealing gasket, the outer shell is provided with the first filter screen and the second filter screen, the side, away from the outer shell, of the second filter screen is provided with a compression ring, the side, away from the second filter screen, of the compression ring is fixedly provided with two guide rods, the end portions, away from the compression ring, of the two guide rods are connected with the protective cover, and the top end of the vertical pipe is communicated with the outer shell.

[0007] By adopting the technical scheme, the boiler flue gas is introduced into the outer shell through the air inlet pipe, the first filter screen and the second filter screen can filter the flue gas, the protective cover can be removed from the outer shell by rotating the protective cover, and the compression ring no longer limits the first filter screen and the second filter screen after the protective cover is removed, so that the first filter screen and the second filter screen are convenient to take out, clean or replace.

[0008] Specifically, the outer wall of each outer frame is fixedly provided with a handle, the upper portion of each handle is provided with an inverted U-shaped insertion rod and two stop blocks, each stop block is fixedly arranged on the outer wall of the box, each stop block is provided with a through hole matched with the insertion rod, and the top end of each handle is provided with an insertion slot matched with the insertion rod.

[0009] By adopting the technical scheme, the stop blocks, the insertion rod and the insertion slot on the handle can improve the stability of the outer frame and prevent the outer frame from sliding.

[0010] Specifically, the outer wall of each outer frame is fixedly provided with a handle, the upper portion of each handle is provided with an inverted U-shaped insertion rod and two stop blocks, each stop block is fixedly arranged on the outer wall of the box, each stop block is provided with a through hole matched with the insertion rod, and the top end of each handle is provided with an insertion slot matched with the insertion rod.

[0011] By adopting the technical scheme, the stop blocks, the insertion rod and the insertion slot on the handle can improve the stability of the outer frame and prevent the outer frame from sliding.

[0012] Specifically, the bottom end of the box is fixedly provided with a mounting seat at each corner, and each mounting seat is provided with a mounting hole.

[0013] The utility model discloses the beneficial effect:

[0014] (1)The multistage combined SCR denitration device, boiler flue gas is introduced into the box through the air inlet pipe, the filtering mechanism can filter the introduced boiler flue gas, the filtered boiler flue gas is sprayed downward through a plurality of nozzles, ammonia is introduced into the box through the ammonia pipe and the branch pipe, the setting of a plurality of exhaust holes on the branch pipe is beneficial to the preliminary mixing of the boiler flue gas and the ammonia, the output shaft of the motor drives the connecting rod to rotate, the first belt pulley rotates, under the cooperation of the two second belt pulleys and the belt, the two cross rods rotate together with the connecting rod, the cross rod and the connecting rod rotate to drive the stirring plate to rotate, the stirring plate can stir the airflow in the box, thereby facilitating the sufficient mixing of the boiler flue gas and the ammonia, and the catalyst is further matched to complete the denitration of the flue gas, the smoke treatment effect is improved, and the outer frame can be taken out from the box, so that the catalyst is convenient to replace.

[0015] (2)The multistage combined SCR denitration device, boiler flue gas is introduced into the box through the air inlet pipe, the filtering mechanism can filter the introduced boiler flue gas, the filtered boiler flue gas is sprayed downward through a plurality of nozzles, ammonia is introduced into the box through the ammonia pipe and the branch pipe, the setting of a plurality of exhaust holes on the branch pipe is beneficial to the preliminary mixing of the boiler flue gas and the ammonia, the output shaft of the motor drives the connecting rod to rotate, the first belt pulley rotates, under the cooperation of the two second belt pulleys and the belt, the two cross rods rotate together with the connecting rod, the cross rod and the connecting rod rotate to drive the stirring plate to rotate, the stirring plate can stir the airflow in the box, thereby facilitating the sufficient mixing of the boiler flue gas and the ammonia, and the catalyst is further matched to complete the denitration of the flue gas, the smoke treatment effect is improved, and the outer frame can be taken out from the box, so that the catalyst is convenient to replace. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model is further illustrated below in combination with the drawings and examples.

[0017] Figure 1 It is the structure schematic diagram of the utility model;

[0018] Figure 2 It is the structure schematic diagram of the utility model Figure 1 It is the enlarged view of structure in A place of the utility model;

[0019] Figure 3 It is the structure schematic diagram of the outer frame of the utility model;

[0020] Figure 4 It is the sectional view of the box of the utility model;

[0021] Figure 5 It is the sectional view of the filtering mechanism of the utility model.

[0022] In the drawing: 1, box;2, filtering mechanism;3, ammonia pipe;30, branch pipe;4, air inlet pipe;5, second belt pulley;6, belt;7, support;8, motor;9, first belt pulley;10, outer frame;11, exhaust pipe;12, vertical pipe;13, horizontal pipe;14, nozzle;15, cross rod;16, connecting rod;17, catalyst;18, stirring plate;19, bearing seat;20, perforated plate;21, sealing frame;22, inserting rod;23, stopper;24, handle;25, shell;26, first filter screen;27, second filter screen;28, guide rod;29, protective cover;31, pressing ring. DETAILED DESCRIPTION

[0023] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0024] In order to facilitate the full mixing of flue gas and ammonia gas and improve the flue gas treatment effect, as an embodiment of the utility model, as shown in Figure 1 、 Figure 3 、 Figure 4 The multi-stage combined SCR denitration device comprises a box body 1, a filtering mechanism 2 is arranged at the top end of the box body 1, a vertical pipe 12 is welded and fixed at the bottom end of the filtering mechanism 2, an air inlet pipe 4 is welded and fixed at one end of the filtering mechanism 2, an ammonia gas pipe 3 is arranged below the air inlet pipe 4, the bottom end of the vertical pipe 12 extends into the box body 1 and is welded and fixed with a horizontal pipe 13, a plurality of spray heads 14 are welded and fixed at the bottom end of the horizontal pipe 13, three branch pipes 30 are welded and fixed at one side of the ammonia gas pipe 3, each branch pipe 30 extends into the box body 1, a plurality of exhaust holes are arranged on each branch pipe 30, three bearing seats 19 are fixed in the box body 1 through bolts, a connecting rod 16 is fixed (prior art) in one of the bearing seats 19, two cross rods 15 are fixed (prior art) in the other two bearing seats 19, a plurality of push plates 18 are welded and fixed on the connecting rod 16 and the two cross rods 15, the end portions of the connecting rod 16 and the two cross rods 15 away from the bearing seats 19 extend out of the box body 1, a first belt pulley 9 is fixed (prior art) on the connecting rod 16, a second belt pulley 5 is fixed on each of the two cross rods 15, a support 7 and an exhaust pipe 11 are welded and fixed on the side of the box body 1 away from the ammonia gas pipe 3, a motor 8 is fixed on the support 7 through bolts, the output shaft of the motor 8 is connected with the connecting rod 16 through a shaft coupling, two belts 6 are arranged on one side of the support 7, one of the second belt pulleys 5 is connected with the first belt pulley 9 through one of the belts 6, the other second belt pulley 5 is connected with the first belt pulley 9 through the other belt 6, three notches communicating with the inside of the box body 1 are arranged on one side of the box body 1, an outer frame 10 is arranged in each notch, a perforated plate 20 is welded and fixed in each outer frame 10, a catalyst 17 is arranged in each outer frame 10, the perforated plate 20 is used for supporting the catalyst 17, the catalyst 17 is in the form of particles, and the catalyst 17 is spread on the perforated plate 20, and three sliding grooves matched with the outer frames 10 are arranged on the two symmetrical vertical inner walls of the box body 1.

[0025] In use, the boiler flue gas is introduced into the box 1 through the air inlet pipe 4, the filtering mechanism 2 can filter the introduced boiler flue gas, the filtered boiler flue gas is sprayed downward through the plurality of nozzles 14, the ammonia gas is introduced into the box 1 through the ammonia gas pipe 3 and the branch pipe 30, the plurality of exhaust holes on the branch pipe 30 are beneficial to the preliminary mixing of the boiler flue gas and the ammonia gas, the output shaft of the motor 8 drives the connecting rod 16 to rotate, the first belt pulley 9 rotates, under the cooperation of the two second belt pulleys 5 and the belt 6, the two cross rods 15 rotate with the connecting rod 16, the cross rod 15 and the connecting rod 16 drive the stirring plate 18 to rotate, the stirring plate 18 can stir the airflow in the box 1, which is beneficial to the sufficient mixing of the boiler flue gas and the ammonia gas, and then the catalyst 17 is used to complete the desulfurization of the flue gas, thereby improving the flue gas treatment effect, and the outer frame 10 can be taken out of the box 1, which is convenient for replacing the catalyst 17.

[0026] In order to facilitate the filtering of the boiler flue gas, for example, as shown in Figure 5 the filtering mechanism 2 comprises an outer shell 25, a first filter screen 26 and a second filter screen 27, the aperture of the first filter screen 26 is larger than that of the second filter screen 27, one end of the outer shell 25 is welded and connected with the air inlet pipe 4, the other end of the outer shell 25 is threadedly connected with a protective cover 29 provided with a sealing gasket, the first filter screen 26 and the second filter screen 27 are arranged in the outer shell 25, the side of the second filter screen 27 away from the outer shell 25 is provided with a pressing ring 31, two guide rods 28 are welded on the side of the pressing ring 31 away from the second filter screen 27, the ends of the two guide rods 28 away from the pressing ring 31 are welded and connected with the protective cover 29, the top end of the vertical pipe 12 is communicated with the outer shell 25, and the vertical pipe 12 is welded with the outer shell 25.

[0027] In use, the boiler flue gas enters the outer shell 25 through the air inlet pipe 4, the first filter screen 26 and the second filter screen 27 can filter the flue gas, the protective cover 29 can be removed from the outer shell 25 by rotating the protective cover 29, and after the protective cover 29 is removed, the pressing ring 31 no longer limits the first filter screen 26 and the second filter screen 27, which facilitates the removal and cleaning or replacement of the first filter screen 26 and the second filter screen 27.

[0028] In order to facilitate the fixing or dismounting of the outer frame 10, for example, as shown in Figure 2 each outer wall of the outer frame 10 is welded and fixed with a handle 24, each handle 24 is provided with an inverted U-shaped insertion rod 22 and two stop blocks 23 above, each stop block 23 is welded and fixed on the outer wall of the box 1, each stop block 23 is provided with a through hole matched with the insertion rod 22, and the top end of each handle 24 is provided with an insertion slot matched with the insertion rod 22.

[0029] In use, the stop blocks 23, the insertion rod 22 and the insertion slot on the handle 24 can improve the stability of the outer frame 10 and prevent the outer frame 10 from sliding, the outer frame 10 can be taken out of the box 1 by lifting the insertion rod 22, holding the handle 24 and pulling the outer frame 10.

[0030] In order to improve the sealing, exemplary, as shown in Figure 3 Each of the outer frame 10 is fixed by adhesive sealing frame 21, the material of sealing frame 21 is silica gel.

[0031] In order to prevent the displacement of the box 1, exemplary, as shown in Figure 1 The bottom end of the box 1 is welded and fixed with mounting seat at four corners, and each mounting seat is provided with mounting hole.

[0032] In use, the bottom end of the bolt is passed through the mounting hole on the mounting seat, and the mounting seat is fixed on the ground.

[0033] The utility model discloses in using, the boiler flue gas enters the shell 25 through air inlet pipe 4, and first filter screen 26 and second filter screen 27 can filter the flue gas, and the filtered boiler flue gas is sprayed downward through multiple spray heads 14, and ammonia gas is introduced into the box 1 through ammonia gas pipe 3 and branch pipe 30, the setting of multiple exhaust holes on branch pipe 30 is favorable to the preliminary mixing of boiler flue gas and ammonia gas, the output shaft of motor 8 drives connecting rod 16 to rotate, and first belt pulley 9 rotates, and under the cooperation of two second belt pulleys 5 and belt 6, two cross rods 15 rotate with connecting rod 16, and cross rod 15 and connecting rod 16 rotate and drive paddle 18 to rotate, and paddle 18 can agitate the airflow in the box 1, and then it is favorable to the sufficient mixing of boiler flue gas and ammonia gas, and the catalytic agent 17 is further matched to complete the flue gas denitration, and the flue gas treatment effect is improved.

[0034] Rotary protective cover 29 can be removed from shell 25, and after protective cover 29 is removed, pressing ring 31 no longer limits first filter screen 26 and second filter screen 27, and first filter screen 26 and second filter screen 27 are convenient to take out and clean or replace.

[0035] Lift the plug rod 22, and the outer frame 10 can be taken out from the box 1 by holding handle 24 and pulling outer frame 10 to replace the catalytic agent 17.

[0036] The basic principle, main features and advantages of the utility model are shown and described above.The technical personnel in this industry should understand that the utility model is not limited by the above examples, and the above implementation and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed to be protected.The scope of protection of the utility model is defined by the appended claims and their equivalents, and the contents not described in detail in the utility model are all the prior art known to the technical personnel in this field.

Claims

1. A multi-stage combined SCR de-NOx device, characterized by, Includes a housing (1), with a filter mechanism (2) at the top of the housing (1), a vertical pipe (12) fixed at the bottom of the filter mechanism (2), an air inlet pipe (4) fixed at one end of the filter mechanism (2), an ammonia pipe (3) below the air inlet pipe (4), the bottom end of the vertical pipe (12) extending into the housing (1) and fixed with a horizontal pipe (13), multiple nozzles (14) fixed at the bottom end of the horizontal pipe (13), and three branch pipes (30) fixed on one side of the ammonia pipe (3). Each branch pipe (30) extends into the housing (1). Each branch pipe (30) is provided with multiple exhaust holes. Three bearing seats (19) are fixed inside the housing (1). A connecting rod (16) is fixed inside one of the bearing seats (19), and crossbars (15) are fixed inside the other two bearing seats (19). Multiple levers (18) are fixed on the connecting rod (16) and the two crossbars (15). The ends of the connecting rod (16) and the two crossbars (15) away from the bearing seats (19) extend into the housing. (1) In addition, a first pulley (9) is fixed on the connecting rod (16), and a second pulley (5) is fixed on each of the two crossbars (15). A support (7) and an exhaust pipe (11) are fixed on the side of the box (1) away from the ammonia pipe (3). A motor (8) is fixed on the support (7). The output shaft of the motor (8) is connected to the connecting rod (16) through a coupling. Two belts (6) are provided on one side of the support (7). One of the second pulleys (5) is connected to the first pulley through one of the belts (6). A pulley (9) is connected, and another second pulley (5) is connected to the first pulley (9) through another belt (6). One side of the box (1) is provided with three notches that communicate with the interior of the box (1). Each notch is provided with an outer frame (10). Each outer frame (10) is fixed with a perforated plate (20). Each outer frame (10) is provided with a catalyst (17). The two symmetrically arranged vertical inner walls of the box (1) are provided with three grooves that are adapted to the outer frame (10).

2. The multi-stage combined SCR deNOx device according to claim 1, characterized by, The filter mechanism (2) includes a housing (25), a first filter screen (26) and a second filter screen (27). One end of the housing (25) is connected to the air inlet pipe (4), and the other end of the housing (25) is threaded with a protective cover (29) with a sealing gasket. The housing (25) contains the first filter screen (26) and the second filter screen (27). The side of the second filter screen (27) away from the housing (25) is provided with a pressure ring (31). Two guide rods (28) are fixed on the side of the pressure ring (31) away from the second filter screen (27). The ends of the two guide rods (28) away from the pressure ring (31) are connected to the protective cover (29). The top end of the vertical pipe (12) is connected to the housing (25).

3. The multi-stage combined SCR deNOx device according to claim 1, characterized by, The outer wall of each outer frame (10) is fixed with a handle (24), the upper portion of each handle (24) is provided with an inverted U-shaped insertion rod (22) and two stoppers (23), each stopper (23) is fixed on the outer wall of the box body (1), each stopper (23) is provided with a through hole matched with the insertion rod (22), and the top end of each handle (24) is provided with an insertion slot matched with the insertion rod (22).

4. The multi-stage combined SCR deNOx device according to claim 1, characterized by, Each outer frame (10) is fixed with a sealing frame (21).

5. The multi-stage combined SCR deNOx device according to claim 1, characterized by, The bottom end of the box body (1) is fixed with mounting seats at four corners, and each mounting seat is provided with a mounting hole.

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