A SNCR+SCR combined denitrification ultra-low emission device

Abstract

The utility model relates to the technical field of SNCR+SCR combined denitration ultra-low emission, and in particular to an SNCR+SCR combined denitration ultra-low emission device, which is convenient for diluting a reducing agent solution, and when the reducing agent is less and needs to be supplemented, it can automatically remind an operator to come for supplementation, thereby improving practicality; it comprises a main body mechanism; it also comprises a spray mechanism, a dilution mechanism, an alarm mechanism and an injection mechanism, the spray mechanism is mounted on the main body mechanism, the dilution mechanism is mounted on the spray mechanism, the alarm mechanism is mounted in the dilution mechanism, the injection mechanism is mounted on the top of the dilution mechanism, the driving mechanism is mounted on the injection mechanism, the flue gas is heated and SCR denitration is processed through the main body mechanism, the spray mechanism is convenient for SNCR denitration processing of the flue gas, and the dilution mechanism dilutes and stirs the reducing agent solution.

Description

Technical Field

[0001] The utility model relates to the technical field of SNCR+SCR combined denitration and ultra-low emission, in particular to a SNCR+SCR combined denitration and ultra-low emission device. Background Art

[0002] Boiler flue gas usually contains a large amount of nitrogen oxides NOx such as NO. Direct emission of nitrogen oxides into the atmosphere will pollute the air, form photochemical smog and acid rain, and endanger human health. Therefore, flue gas must be denitrified (i.e., denitrified) before emission. There are currently two main flue gas denitrification technologies: selective catalytic reduction (SCR) and selective non-catalytic reduction denitrification (SNCR). SNCR+SCR combined denitrification ultra-low emission is a technology used to reduce the content of nitrogen oxides in coal-fired boiler emissions. It combines the two denitrification technologies of selective non-catalytic reduction and selective catalytic reduction to achieve higher denitrification efficiency and lower NOx emissions. The combined use of SNCR and SCR technologies can fully utilize the advantages of the two technologies, improve denitrification efficiency and reduce operating costs.

[0003] In the existing SNCR+SCR combined denitrification ultra-low emission technology, for example, the prior art with application number CN202121670630.1, it includes a boiler, an economizer, a gas preheater, a furnace, a heater, an ammonia tank, a dilution water tank, an ammonia pump, a dilution water pump, a mixing tank and an atomizer, etc. The flue gas is first denitrified by the SNCR reaction system, and then the completely denitrified gas enters the SCR reaction system for secondary denitrification. Since the SNCR denitrification temperature is higher than that of SCR, the flue gas enters the SCR denitrification after the SNCR denitrification, which avoids secondary heating of the flue gas.

[0004] However, the prior art is not convenient for accurately diluting the reducing agent solution, and the dilution efficiency is low. Moreover, when the diluted reducing agent is less dissolved and needs to be replenished, the prior art is not convenient for reminding the operator to come for replenishment, which reduces the practicality. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an SNCR+SCR combined denitrification ultra-low emission device which is convenient for diluting the reducing agent solution and can automatically remind the operator to replenish when the reducing agent is less and needs to be replenished, thereby improving practicality.

[0006] The utility model discloses an SNCR+SCR combined denitration ultra-low emission device, comprising a main body mechanism; a spray mechanism, a dilution mechanism, an alarm mechanism and an injection mechanism, wherein the spray mechanism is mounted on the main body mechanism, the dilution mechanism is mounted on the spray mechanism, the alarm mechanism is mounted in the dilution mechanism, the injection mechanism is mounted on the top of the dilution mechanism, and the drive mechanism is mounted on the injection mechanism, the flue gas is heated and SCR denitration is processed by the main body mechanism, the spray mechanism is convenient for SNCR denitration of the flue gas, the dilution mechanism dilutes and stirs the reducing agent solution, the alarm mechanism is convenient for detecting the amount of the reducing agent solution in the dilution mechanism, and the drive mechanism drives the injection mechanism to add the reducing agent solution into the dilution mechanism; the flue gas is heated and SCR denitration is processed by the main body mechanism, the quality of denitration emission is improved, the spray mechanism is convenient for SNCR denitration of the flue gas, the quality of denitration is improved, the dilution mechanism dilutes and stirs the reducing agent solution, the efficiency and quality of dilution are improved, the alarm mechanism is convenient for detecting the amount of the reducing agent solution in the dilution mechanism, and when the reducing agent is easy to be less, the operator is reminded to come to replenish, and the drive mechanism drives the injection mechanism to add the reducing agent solution into the dilution mechanism.

[0007] Preferably, the main structure includes a boiler, an induced draft fan, an economizer, an air preheater, an SCR treatment box and a reduction plate. A smoke exhaust pipe is arranged on the side wall of the boiler. The induced draft fan is installed on the smoke exhaust pipe of the boiler. The economizer is installed on the smoke exhaust pipe of the boiler. The air preheater is installed at the end of the economizer. The spray mechanism is installed on the smoke exhaust pipe of the boiler. The SCR treatment box is installed at the end of the spray mechanism. The reduction plate is installed in the SCR treatment box. The flue gas in the boiler is extracted by opening the induced draft fan, and the flue gas enters the air preheater through the economizer, the flue gas is heated by the air preheater, and then the flue gas is treated by SNCR through the spray mechanism. After the flue gas enters the SCR treatment box, it is reduced by the reduction plate to improve the quality of flue gas degassing.

[0008] Preferably, the spray mechanism includes a spray cylinder, an insulation layer, a heating wire, a spray pipe, a spray head and a water pump. The spray cylinder is installed on the smoke exhaust pipe of the boiler, the spray cylinder is located between the air preheater and the SCR treatment box, the insulation layer is installed on the outer wall of the spray cylinder, the heating wire is spirally installed in the insulation layer, the spray pipe is installed in the spray cylinder, the spray head is installed on the spray pipe, the water pump is installed at the top of the spray cylinder, and the water pump is connected to the spray pipe; by turning on the water pump, the dilution liquid of the reducing agent in the dilution mechanism is added into the spray pipe, and then sprayed out through the spray head, thereby reducing the flue gas and improving the quality of the degassing; then, by turning on the heating wire, the inside of the spray cylinder is heated to improve the quality and efficiency of the degassing.

[0009] Preferably, the dilution mechanism includes a dilution cylinder, a stirring shaft, stirring blades and a stirring motor. The dilution cylinder is installed at the top of the spray cylinder, the dilution cylinder is connected to the water pump through a pipeline, the stirring shaft is rotatably installed in the dilution cylinder, the stirring blades are installed on the stirring shaft, the stirring motor is installed on the dilution cylinder, and the output end of the stirring motor is connected to the stirring shaft; the stirring shaft is driven to rotate by turning on the stirring motor, and then the reducing agent in the dilution cylinder is diluted by the rotation of the stirring blades, thereby improving practicality.

[0010] Preferably, the alarm mechanism includes a float, a first mounting plate, a sliding sleeve, a first sliding ring, a pressure sensor, a second sliding ring and a buzzer, the float is slidably mounted in the dilution cylinder, the first mounting plate is mounted on the inner wall of the dilution cylinder, the sliding sleeve is mounted on the top of the first mounting plate, the first sliding ring is slidably mounted in the sliding sleeve, the pressure sensor is mounted in the sliding sleeve, one end of the second sliding ring is mounted on the top of the pressure sensor, the other end of the second sliding ring is mounted on the bottom of the first sliding ring, and the buzzer is mounted on the top of the dilution cylinder; the float floats on the page of the reducing agent, when the reducing agent solution in the dilution cylinder is less, the float contacts the first sliding ring and squeezes the first sliding ring to slide in the sliding sleeve, thereby causing the contraction of the second sliding ring to squeeze the pressure sensor, and the pressure is detected by the pressure sensor. When the pressure sensor detects that the pressure becomes larger, an electrical signal is sent through the pressure sensor to cause the buzzer to send an electrical signal to remind the operator to come for replenishment.

[0011] Preferably, the injection mechanism includes an injection cylinder, a sliding piston, a first one-way valve, a discharge hopper and a second one-way valve. The injection cylinder is installed on the top of the dilution cylinder through a pipeline, the sliding piston is slidably installed in the injection cylinder, the first one-way valve is installed on the pipeline, the discharge hopper is installed on the side wall of the injection cylinder through a liquid inlet pipe, and the second one-way valve is installed on the liquid inlet pipe; the sliding piston is driven to slide in the injection cylinder by opening the driving mechanism, and when the sliding piston slides in a direction away from the dilution cylinder, the second one-way valve opens and the first one-way valve closes, so that the reducing agent in the discharge hopper is added to the injection cylinder, and when the sliding piston slides in the injection cylinder toward the dilution cylinder, the first one-way valve opens and the second one-way valve closes, so that the reducing agent in the injection cylinder is added to the dilution cylinder.

[0012] Preferably, the driving mechanism includes a second mounting plate, a push rod, a turntable, an eccentric shaft, a connecting rod and a driving motor, the second mounting plate is mounted on the side wall of the injection cylinder, the push rod is mounted on the sliding piston, the push rod is slidably mounted on the side wall of the injection cylinder, the turntable is rotatably mounted on the top end of the second mounting plate, the eccentric shaft is eccentrically rotatably mounted on the turntable, one end of the connecting rod is rotatably mounted on the eccentric shaft, the other end of the connecting rod is rotatably mounted on the push rod, the driving motor is mounted on the bottom end of the second mounting plate, and the output end of the driving motor is connected to the turntable; the turntable is driven to rotate by turning on the driving motor, and then the eccentric shaft is driven to rotate eccentrically, thereby pushing the push rod to slide on the injection cylinder through the connecting rod, and then the sliding piston slides in the injection cylinder, when the sliding piston slides in the direction away from the dilution cylinder, the second one-way valve opens and the first one-way valve closes, so that the reducing agent in the discharge hopper is added to the injection cylinder, and when the sliding piston slides in the injection cylinder toward the dilution cylinder, the first one-way valve opens and the second one-way valve closes, and the reducing agent in the injection cylinder is added to the dilution cylinder.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the main mechanism heats the flue gas and performs SCR denitration treatment to improve the quality of denitration emissions; the spray mechanism facilitates SNCR denitration treatment of the flue gas to improve the quality of denitration; the dilution mechanism dilutes and stirs the reducing agent solution to improve the efficiency and quality of dilution; the alarm mechanism facilitates the detection of the amount of reducing agent solution in the dilution mechanism and reminds the operator to replenish it when the reducing agent is likely to be low; the driving mechanism drives the injection mechanism to add the reducing agent solution into the dilution mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0015] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0016] Figure 3 It is a front-view cross-sectional axonometric structural schematic diagram of the utility model;

[0017] Figure 4 It is a side view structural schematic diagram of the utility model;

[0018] Figure 5 The utility model Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0019] Markings in the attached figure: 01, main body; 11, boiler; 12, induced draft fan; 13, economizer; 14, air preheater; 15, SCR treatment box; 16, reduction plate; 02, spray mechanism; 21, spray barrel; 22, insulation layer; 23, heating wire; 24, spray pipe; 25, spray head; 26, water pump; 03, dilution mechanism; 31, dilution barrel; 32, stirring shaft; 33, stirring blade; 34, stirring motor; 04, alarm mechanism; 4 1. Float; 42. First mounting plate; 43. Sliding sleeve; 44. First sliding ring; 45. Pressure sensor; 46. Second sliding ring; 47. Buzzer; 05. Injection mechanism; 51. Injection cylinder; 52. Sliding piston; 53. First one-way valve; 54. Discharge hopper; 55. Second one-way valve; 06. Driving mechanism; 61. Second mounting plate; 62. Push rod; 63. Turntable; 64. Eccentric shaft; 65. Connecting rod; 66. Driving motor. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, it includes a main body mechanism 01, a spray mechanism 02, a dilution mechanism 03, an alarm mechanism 04 and an injection mechanism 05, the spray mechanism 02 is installed on the main body mechanism 01, the dilution mechanism 03 is installed on the spray mechanism 02, the alarm mechanism 04 is installed in the dilution mechanism 03, the injection mechanism 05 is installed on the top of the dilution mechanism 03, and the drive mechanism 06 is installed on the injection mechanism 05;

[0023] The main mechanism 01 heats the flue gas and performs SCR destocking treatment, the spray mechanism 02 facilitates the SNCR destocking treatment of the flue gas, the dilution mechanism 03 dilutes and stirs the reducing agent solution, the alarm mechanism 04 facilitates the detection of the amount of reducing agent solution in the dilution mechanism 03, and the driving mechanism 06 drives the injection mechanism 05 to add the reducing agent solution into the dilution mechanism 03;

[0024] The main mechanism 01 includes a boiler 11, an induced draft fan 12, an economizer 13, an air preheater 14, an SCR treatment box 15 and a reduction plate 16. A smoke exhaust pipe is provided on the side wall of the boiler 11. The induced draft fan 12 is installed on the smoke exhaust pipe of the boiler 11. The economizer 13 is installed on the smoke exhaust pipe of the boiler 11. The air preheater 14 is installed at the end of the economizer 13. The spray mechanism 02 is installed on the smoke exhaust pipe of the boiler 11. The SCR treatment box 15 is installed at the end of the spray mechanism 02. The reduction plate 16 is installed in the SCR treatment box 15.

[0025] The spray mechanism 02 includes a spray barrel 21, an insulation layer 22, a heating wire 23, a spray pipe 24, a spray head 25 and a water pump 26. The spray barrel 21 is installed on the exhaust pipe of the boiler 11. The spray barrel 21 is located between the air preheater 14 and the SCR treatment box 15. The insulation layer 22 is installed on the outer wall of the spray barrel 21. The heating wire 23 is spirally installed in the insulation layer 22. The spray pipe 24 is installed in the spray barrel 21. The spray head 25 is installed on the spray pipe 24. The water pump 26 is installed on the top of the spray barrel 21, and the water pump 26 is connected to the spray pipe 24.

[0026] The dilution mechanism 03 includes a dilution cylinder 31, a stirring shaft 32, a stirring blade 33 and a stirring motor 34. The dilution cylinder 31 is installed at the top of the spray cylinder 21. The dilution cylinder 31 is connected to the water pump 26 through a pipeline. The stirring shaft 32 is rotatably installed in the dilution cylinder 31. The stirring blade 33 is installed on the stirring shaft 32. The stirring motor 34 is installed on the dilution cylinder 31. The output end of the stirring motor 34 is connected to the stirring shaft 32.

[0027] The flue gas in the boiler 11 is extracted by opening the induced draft fan 12, and the flue gas enters the air preheater 14 through the economizer 13, and is heated by the air preheater 14, and then the flue gas is treated by SNCR through the spray mechanism 02. After the flue gas enters the SCR treatment box 15, it is reduced by the reduction plate 16 to improve the quality of flue gas desulfurization. By opening the water pump 26, the diluent of the reducing agent in the dilution mechanism 03 is added to the spray pipe 24, and then sprayed out through the spray head 25, thereby reducing the flue gas. , improve the quality of the de-pinning, and then turn on the heating wire 23 to heat the inside of the spray cylinder 21 to improve the quality and efficiency of the de-pinning, turn on the stirring motor 34 to drive the stirring shaft 32 to rotate, and then rotate the stirring blade 33 to dilute the reducing agent in the dilution cylinder 31 to improve practicality, the alarm mechanism 04 is convenient for detecting the amount of reducing agent solution in the dilution mechanism 03, and when the reducing agent is likely to be less, remind the operator to come to replenish it, and the driving mechanism 06 drives the injection mechanism 05 to add the reducing agent solution into the dilution mechanism 03.

[0028] Example 2

[0029] like Figures 1 to 5As shown, it includes a main body mechanism 01, a spray mechanism 02, a dilution mechanism 03, an alarm mechanism 04 and an injection mechanism 05, the spray mechanism 02 is installed on the main body mechanism 01, the dilution mechanism 03 is installed on the spray mechanism 02, the alarm mechanism 04 is installed in the dilution mechanism 03, the injection mechanism 05 is installed on the top of the dilution mechanism 03, and the drive mechanism 06 is installed on the injection mechanism 05;

[0030] The main mechanism 01 heats the flue gas and performs SCR destocking treatment, the spray mechanism 02 facilitates the SNCR destocking treatment of the flue gas, the dilution mechanism 03 dilutes and stirs the reducing agent solution, the alarm mechanism 04 facilitates the detection of the amount of reducing agent solution in the dilution mechanism 03, and the driving mechanism 06 drives the injection mechanism 05 to add the reducing agent solution into the dilution mechanism 03;

[0031] The alarm mechanism 04 includes a float 41, a first mounting plate 42, a sliding sleeve 43, a first sliding ring 44, a pressure sensor 45, a second sliding ring 46 and a buzzer 47. The float 41 is slidably mounted in the dilution cylinder 31, the first mounting plate 42 is mounted on the inner wall of the dilution cylinder 31, the sliding sleeve 43 is mounted on the top of the first mounting plate 42, the first sliding ring 44 is slidably mounted in the sliding sleeve 43, the pressure sensor 45 is mounted in the sliding sleeve 43, one end of the second sliding ring 46 is mounted on the top of the pressure sensor 45, the other end of the second sliding ring 46 is mounted on the bottom of the first sliding ring 44, and the buzzer 47 is mounted on the top of the dilution cylinder 31;

[0032] The injection mechanism 05 includes an injection cylinder 51, a sliding piston 52, a first one-way valve 53, a discharge hopper 54 and a second one-way valve 55. The injection cylinder 51 is installed at the top of the dilution cylinder 31 through a pipeline, the sliding piston 52 is slidably installed in the injection cylinder 51, the first one-way valve 53 is installed on the pipeline, the discharge hopper 54 is installed on the side wall of the injection cylinder 51 through a liquid inlet pipe, and the second one-way valve 55 is installed on the liquid inlet pipe;

[0033] The driving mechanism 06 includes a second mounting plate 61, a push rod 62, a rotating disk 63, an eccentric shaft 64, a connecting rod 65 and a driving motor 66. The second mounting plate 61 is mounted on the side wall of the injection cylinder 51, the push rod 62 is mounted on the sliding piston 52, the push rod 62 is slidably mounted on the side wall of the injection cylinder 51, the rotating disk 63 is rotatably mounted on the top of the second mounting plate 61, the eccentric shaft 64 is eccentrically rotatably mounted on the rotating disk 63, one end of the connecting rod 65 is rotatably mounted on the eccentric shaft 64, the other end of the connecting rod 65 is rotatably mounted on the push rod 62, the driving motor 66 is mounted on the bottom end of the second mounting plate 61, and the output end of the driving motor 66 is connected to the rotating disk 63;

[0034] The main mechanism 01 heats the flue gas and performs SCR denitration treatment to improve the quality of denitration emission. The spray mechanism 02 facilitates the SNCR denitration treatment of the flue gas to improve the quality of denitration. The dilution mechanism 03 dilutes and stirs the reducing agent solution to improve the efficiency and quality of dilution. The float 41 floats on the reducing agent surface. When the reducing agent solution in the dilution cylinder 31 is less, the float 41 contacts the first sliding ring 44 and squeezes the first sliding ring 44 to slide in the sliding sleeve 43, thereby causing the second sliding ring 46 to contract and squeeze the pressure sensor 45. The pressure is detected by the pressure sensor 45. When the pressure sensor 45 detects that the pressure becomes larger, the pressure sensor 45 sends The output electrical signal causes the buzzer 47 to emit an electrical signal to remind the operator to come for replenishment. By turning on the drive motor 66, the turntable 63 is driven to rotate, and then the eccentric shaft 64 is driven to rotate eccentrically, so that the push rod 62 is pushed to slide on the injection cylinder 51 through the connecting rod 65, and then the sliding piston 52 slides in the injection cylinder 51. When the sliding piston 52 slides in the direction away from the dilution cylinder 31, the second one-way valve 55 opens and the first one-way valve 53 is closed, so that the reducing agent in the discharge hopper 54 is added to the injection cylinder 51. When the sliding piston 52 slides in the injection cylinder 51 toward the dilution cylinder 31, the first one-way valve 53 opens and the second one-way valve 55 is closed, and the reducing agent in the injection cylinder 51 is added to the dilution cylinder 31.

[0035] like Figures 1 to 5As shown, the utility model is a SNCR+SCR combined denitrification ultra-low emission device. When it is working, the flue gas in the boiler 11 is extracted by opening the induced draft fan 12, and the flue gas enters the air preheater 14 through the economizer 13, and the flue gas is heated by the air preheater 14, and then the flue gas is treated by SNCR through the spray mechanism 02. After the flue gas enters the SCR treatment box 15, it is reduced by the reduction plate 16 to improve the quality of the flue gas denitrification. By turning on the water pump 26, the dilution mechanism 0 3 is added into the spray pipe 24, and then sprayed out through the spray head 25, thereby reducing the smoke and improving the quality of the de-soldering. Then, the spray cylinder 21 is heated by turning on the heating wire 23 to improve the quality and efficiency of the de-soldering. The stirring shaft 32 is driven to rotate by turning on the stirring motor 34, and then the reducing agent in the dilution cylinder 31 is diluted by the rotation of the stirring blade 33 to improve the practicality. The float 41 floats on the page of the reducing agent. When the reducing agent solution in the dilution cylinder 31 is less, the float 41 contacts the first sliding ring 44 and squeezes the first sliding ring 44 to slide in the sliding sleeve 43, thereby causing the contraction of the second sliding ring 46 to squeeze the pressure sensor 45. The pressure is detected by the pressure sensor 45. When the pressure sensor 45 detects that the pressure becomes larger, the pressure sensor 45 sends an electrical signal to make the buzzer 47 send an electrical signal to remind the operator to come for replenishment. The turntable 63 is driven to rotate by turning on the drive motor 66, thereby driving the eccentric shaft 64 to rotate eccentrically, thereby connecting The rod 65 pushes the push rod 62 to slide on the injection cylinder 51, and then the sliding piston 52 slides in the injection cylinder 51. When the sliding piston 52 slides in the direction away from the dilution cylinder 31, the second one-way valve 55 opens and the first one-way valve 53 closes, so that the reducing agent in the discharge hopper 54 is added to the injection cylinder 51. When the sliding piston 52 slides in the injection cylinder 51 toward the dilution cylinder 31, the first one-way valve 53 opens and the second one-way valve 55 closes, and the reducing agent in the injection cylinder 51 is added to the dilution cylinder 31.

[0036] The induced draft fan 12, heating wire 23, water pump 26, stirring motor 34, pressure sensor 45, buzzer 47, first one-way valve 53, second one-way valve 55 and drive motor 66 of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for creative labor by technicians in this field.

[0037] The main functions achieved by the utility model are: in the SNCR+SCR combined denitrification ultra-low emission working process, it is convenient to dilute the reducing agent solution, and when the reducing agent is less and needs to be supplemented, it can automatically remind the operator to come for supplementation, thereby improving practicality.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A SNCR+SCR combined denitrification ultra-low emission device, comprising a main body (01); characterized in that: It also includes a spray mechanism (02), a dilution mechanism (03), an alarm mechanism (04) and an injection mechanism (05), wherein the spray mechanism (02) is mounted on the main mechanism (01), the dilution mechanism (03) is mounted on the spray mechanism (02), the alarm mechanism (04) is mounted in the dilution mechanism (03), the injection mechanism (05) is mounted on the top of the dilution mechanism (03), and the drive mechanism (06) is mounted on the injection mechanism (05); The main mechanism (01) heats the flue gas and performs SCR denitration treatment, the spray mechanism (02) facilitates the SNCR denitration treatment of the flue gas, the dilution mechanism (03) dilutes and stirs the reducing agent solution, the alarm mechanism (04) facilitates the detection of the amount of reducing agent solution in the dilution mechanism (03), and the driving mechanism (06) drives the injection mechanism (05) to add the reducing agent solution into the dilution mechanism (03).

2. The SNCR+SCR combined denitrification ultra-low emission device according to claim 1, characterized in that: The main mechanism (01) comprises a boiler (11), an induced draft fan (12), an economizer (13), an air preheater (14), an SCR treatment box (15) and a reduction plate (16); a smoke exhaust pipe is arranged on the side wall of the boiler (11); the induced draft fan (12) is mounted on the smoke exhaust pipe of the boiler (11); the economizer (13) is mounted on the smoke exhaust pipe of the boiler (11); the air preheater (14) is mounted at the end of the economizer (13); the spray mechanism (02) is mounted on the smoke exhaust pipe of the boiler (11); the SCR treatment box (15) is mounted at the end of the spray mechanism (02); and the reduction plate (16) is mounted in the SCR treatment box (15).

3. The SNCR+SCR combined denitrification ultra-low emission device according to claim 2, characterized in that: The spray mechanism (02) comprises a spray barrel (21), a heat preservation layer (22), a heating wire (23), a spray pipe (24), a spray head (25) and a water pump (26). The spray barrel (21) is installed on the exhaust pipe of the boiler (11). The spray barrel (21) is located between the air preheater (14) and the SCR treatment box (15). The heat preservation layer (22) is installed on the outer wall of the spray barrel (21). The heating wire (23) is spirally installed in the heat preservation layer (22). The spray pipe (24) is installed in the spray barrel (21). The spray head (25) is installed on the spray pipe (24). The water pump (26) is installed at the top of the spray barrel (21). The water pump (26) is connected to the spray pipe (24).

4. The SNCR+SCR combined denitrification ultra-low emission device according to claim 3, characterized in that: The dilution mechanism (03) comprises a dilution cylinder (31), a stirring shaft (32), a stirring blade (33) and a stirring motor (34). The dilution cylinder (31) is installed at the top of the spray cylinder (21). The dilution cylinder (31) is connected to the water pump (26) through a pipeline. The stirring shaft (32) is rotatably installed in the dilution cylinder (31). The stirring blade (33) is installed on the stirring shaft (32). The stirring motor (34) is installed on the dilution cylinder (31). The output end of the stirring motor (34) is connected to the stirring shaft (32).

5. The SNCR+SCR combined denitrification ultra-low emission device according to claim 4, characterized in that: The alarm mechanism (04) comprises a float (41), a first mounting plate (42), a sliding sleeve (43), a first sliding ring (44), a pressure sensor (45), a second sliding ring (46) and a buzzer (47). The float (41) is slidably mounted in the dilution cylinder (31), the first mounting plate (42) is mounted on the inner wall of the dilution cylinder (31), the sliding sleeve (43) is mounted on the top end of the first mounting plate (42), the first sliding ring (44) is slidably mounted in the sliding sleeve (43), the pressure sensor (45) is mounted in the sliding sleeve (43), one end of the second sliding ring (46) is mounted on the top end of the pressure sensor (45), the other end of the second sliding ring (46) is mounted on the bottom end of the first sliding ring (44), and the buzzer (47) is mounted on the top end of the dilution cylinder (31).

6. The SNCR+SCR combined denitrification ultra-low emission device according to claim 4, characterized in that: The injection mechanism (05) comprises an injection cylinder (51), a sliding piston (52), a first one-way valve (53), a discharge hopper (54) and a second one-way valve (55); the injection cylinder (51) is installed at the top of the dilution cylinder (31) through a pipeline; the sliding piston (52) is slidably installed in the injection cylinder (51); the first one-way valve (53) is installed on the pipeline; the discharge hopper (54) is installed on the side wall of the injection cylinder (51) through a liquid inlet pipe; and the second one-way valve (55) is installed on the liquid inlet pipe.

7. The SNCR+SCR combined denitrification ultra-low emission device according to claim 6, characterized in that: The driving mechanism (06) comprises a second mounting plate (61), a push rod (62), a rotating disk (63), an eccentric shaft (64), a connecting rod (65) and a driving motor (66). The second mounting plate (61) is mounted on the side wall of the injection cylinder (51), the push rod (62) is mounted on the sliding piston (52), the push rod (62) is slidably mounted on the side wall of the injection cylinder (51), the rotating disk (63) is rotatably mounted on the top end of the second mounting plate (61), the eccentric shaft (64) is eccentrically rotatably mounted on the rotating disk (63), one end of the connecting rod (65) is rotatably mounted on the eccentric shaft (64), the other end of the connecting rod (65) is rotatably mounted on the push rod (62), the driving motor (66) is mounted on the bottom end of the second mounting plate (61), and the output end of the driving motor (66) is connected to the rotating disk (63).

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