Energy-saving SNCR + SCR combined denitration device

Abstract

The utility model relates to the technical field of denitration devices, in particular to an energy-saving SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) combined denitration device, which not only pretreats flue gas and prevents impurities mixed in the flue gas from influencing subsequent denitration, but also recycles water generated after reaction and saves water resources. Comprising a filtering mechanism; the system further comprises an SNCR denitration mechanism, an ammonia preparation mechanism, a cooling mechanism and an SCR denitration mechanism, the SNCR denitration mechanism is installed on the filtering mechanism and conducts SNCR denitration on the flue gas, the ammonia preparation mechanism is installed on the SNCR denitration mechanism and conveys ammonia water into the SNCR denitration mechanism and the SCR denitration mechanism, the cooling mechanism is installed on the SNCR denitration mechanism and conducts cooling treatment on the flue gas, and the SCR denitration mechanism conducts SCR denitration treatment on the flue gas. The SCR denitration mechanism is mounted on the cooling mechanism and is used for carrying out SCR denitration on the flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration devices, in particular to an energy-saving SNCR+SCR combined denitration device. Background Art

[0002] Boiler flue gas usually contains a large amount of nitrogen oxides. Direct emission of nitrogen oxides into the atmosphere will pollute the air, form photochemical smog and acid rain, and harm human health. Therefore, flue gas must be denitrated before being discharged. Currently, there are two main flue gas denitrification technologies: Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction Denitrification (SNCR).

[0003] The existing SNCR+SCR combined denitrification device, for example, a SNCR+SCR combined denitrification device disclosed in the utility model patent with application number 201520506749.3, has a main structure including a reducing agent preparation and storage system, a mixing and conveying system, a pressurized metering and distribution system, a spray atomization system, an SNCR denitrification reaction device, an SCR reactor, a dust removal and desulfurization tower, an industrial furnace and an exhaust gas emission system. The SNCR denitrification reaction device is installed in the furnace of the industrial furnace, and the reducing agent preparation and storage system, the mixing and conveying system, the pressurized metering and distribution system and the spray atomization system are connected to the SNCR denitrification reaction device in sequence. The flue gas outlet of the industrial furnace is connected to the exhaust gas emission system through the SCR reactor and the dust removal and desulfurization tower in sequence. When in use, the reducing agent is sprayed into the furnace to perform SNCR denitrification first, and the escaped ammonia is further removed from Nox under the action of the SCR reactor catalyst.

[0004] However, most of the existing combined denitrification devices do not remove impurities in the flue gas, which can easily affect the subsequent denitrification efficiency. Moreover, most of the existing denitrification devices do not utilize the water and nitrogen generated after the reaction, resulting in energy waste. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an energy-saving SNCR+SCR combined denitrification device which not only pre-treats the flue gas to prevent impurities contained in the flue gas from affecting subsequent denitrification, but also reuses the water generated after the reaction to save water resources.

[0006] The utility model discloses an energy-saving SNCR+SCR combined denitration device, comprising a filtering mechanism; an SNCR denitration mechanism, an ammonia making mechanism, a cooling mechanism and an SCR denitration mechanism, wherein the SNCR denitration mechanism is installed on the filtering mechanism and performs SNCR denitration on flue gas, the ammonia making mechanism is installed on the SNCR denitration mechanism and transports ammonia water to the SNCR denitration mechanism and the SCR denitration mechanism respectively, the cooling mechanism is installed on the SNCR denitration mechanism and performs cooling treatment on flue gas, and the SCR denitration mechanism is installed on the cooling mechanism and performs SCR denitration on flue gas; after the impurities are filtered out of the flue gas in the filtering mechanism, the flue gas enters the SNCR denitration mechanism, the ammonia making mechanism transports ammonia water to the SNCR denitration mechanism, the flue gas and ammonia water react in the SNCR denitration mechanism to generate nitrogen and water, the water flows back to the ammonia making mechanism for use again, the flue gas enters the cooling mechanism to reduce the temperature, and after the flue gas is reduced to a suitable temperature, it enters the SCR denitration mechanism, in the SCR denitration mechanism, ammonia water and flue gas are further denitrated under the action of a catalyst, and the flue gas is discharged from the device.

[0007] Preferably, the filtering mechanism includes a connecting flange, a filter box, a filter plate and a connecting pipe, the connecting flange is connected to the interior of the boiler exhaust pipe, the filter box is connected to the interior of the connecting flange, the filter plate is installed inside the filter box, and the connecting pipe is connected to the interior of the filter plate; the flue gas in the boiler enters the filter box through the connecting flange, and the large particles of impurities in the flue gas are filtered out by the filter plate in the filter box, and then transported to the SNCR denitrification mechanism through the connecting pipe for preliminary denitrification.

[0008] Preferably, the SNCR denitrification mechanism comprises a denitrification box, a water delivery pipe, a metering water distributor, a plurality of nozzles, a return water pipe and four connecting columns. A cavity is provided inside the denitrification box, the cavity of the denitrification box is connected to the inside of the connecting pipe, the water delivery pipe is installed in the cavity of the denitrification box, the metering water distributor is installed on the water delivery pipe and connected to the inside of the water delivery pipe, the plurality of nozzles are evenly distributed and installed on the metering water distributor, the top of the return water pipe is connected to the bottom of the denitrification box. The top ends of the four connecting columns are connected to the bottom end of the denitrification box one; the flue gas enters the cavity of the denitrification box one through the connecting pipe, the water pipe one transports the ammonia water to the metering water distributor one, the metering water distributor one meters the ammonia water and evenly distributes it to multiple groups of nozzles one, the nozzle one sprays the ammonia water into the cavity of the denitrification box one, the flue gas reacts with the ammonia water to remove the nitrogen oxides in the flue gas, and generates water and nitrogen at the same time, the water flows back to the ammonia making mechanism through the return pipe one, and the flue gas enters the cooling mechanism.

[0009] Preferably, the ammonia production mechanism includes an ammonia production cylinder, an air delivery pipe, an electric motor, a reducer, a stirring rod, a water pump 1, a water extraction pipe, a water pump 2 and a water return pipe 2. The bottom end of the ammonia production cylinder is connected to the top of the denitrification tank 1. A chamber is arranged inside the ammonia production cylinder. The bottom end of the air delivery pipe is connected to the top of the ammonia production cylinder. The bottom end of the electric motor is connected to the top of the ammonia production cylinder. The bottom end of the reducer is connected to the top of the ammonia production cylinder. The stirring rod is rotatably installed in the chamber of the ammonia production cylinder and is longitudinally connected to the reducer. The bottom end of the water pump 1 is connected to the top of the ammonia production cylinder. The water delivery pipe 1 is connected to the inside of the water outlet of the water pump 1. The water extraction pipe is installed on the water pump 1 and is connected to the inside of the chamber of the ammonia production cylinder. The bottom end of the water pump 2 is connected to the top of the ammonia production cylinder. , the return pipe 1 is connected with the water inlet of the water pump 2, the return pipe 2 is installed on the water pump 2 and connected with the inside of the chamber of the ammonia cylinder; the chamber of the ammonia cylinder is filled with clean water, and the gas pipe transports the ammonia water to the chamber of the ammonia cylinder to react with water to generate ammonia water, and at the same time, the motor is started, and the motor drives the stirring rod to rotate through the reducer, and the stirring rod stirs the clean water to accelerate the reaction of ammonia gas and water to generate ammonia water, and then the reducer drives the water pump 1 to pump water, and the water pump 1 extracts the ammonia water through the pumping pipe and transports it to the metering water distributor 1 through the water pipe 1, and then the reducer drives the water pump 2 to pump water, and the water pump 2 draws back the water in the SNCR denitrification mechanism through the return pipe 1 and replenishes it to the chamber of the ammonia cylinder through the return pipe 2.

[0010] Preferably, the cooling mechanism includes a heat dissipation pipe, two sets of thermometers, a fan and blades. The heat dissipation pipe is installed on the denitrification box and is connected to the inner cavity of the denitrification box. The two sets of thermometers are respectively installed at the head end and the tail end of the heat dissipation pipe. The fan is installed between the two sets of connecting columns, and the blades are installed on the fan. The temperature of the flue gas after the initial denitrification is as high as 800-1000°C, and needs to be reduced to 300-400°C before entering the secondary denitrification. The flue gas after the initial denitrification enters the heat dissipation pipe, and the flue gas temperature is measured by the thermometer installed at the head end of the heat dissipation pipe. The fan is started, and the fan drives the blades to rotate to cool the flue gas in the heat dissipation pipe. Then the thermometer at the tail end of the thermometer measures the flue gas again to ensure that the flue gas drops to a suitable temperature, and then it is transported to the SCR denitrification mechanism.

[0011] Preferably, the SCR denitration mechanism includes a denitration box 2, a bracket, a water pipe 2, a metering water distributor 2, a plurality of nozzle groups 2, a catalyst reaction plate, a return water pipe 3 and a chimney, the top of the denitration box 2 is connected to the bottom of the connecting column, and an inner cavity is arranged inside the bracket, the top of the bracket is connected to the bottom of the denitration box 2, the bottom of the bracket is installed on the ground, the water pipe 2 is installed at the top of the inner cavity of the denitration box 2 and the water pipe 2 is connected to the inside of the water pipe 1, the top of the metering water distributor 2 is connected to the inside of the bottom of the water pipe 2, the plurality of nozzle groups 2 are all installed on the metering water distributor 2, the catalyst reaction plate is installed in the inner cavity of the denitration box 2, the top of the return water pipe 3 is connected to the inside of the bottom of the denitration box 2, and The return pipe three is connected with the inside of the connecting column, the chimney is installed on the denitrification box two and is connected with the inner cavity of the denitrification box two; the heat dissipation pipe transports the flue gas to the inner cavity of the denitrification box two, the water delivery pipe one transports the ammonia water to the metering water distributor two through the water delivery pipe two, the metering water distributor two meters the ammonia water and evenly distributes it to the multiple groups of nozzles two, the nozzles two spray the ammonia water onto the catalyst reaction plate, the ammonia water and the flue gas react under the catalysis of the catalyst reaction plate, and the nitrogen oxides in the flue gas are decomposed in large quantities, and then the flue gas is discharged into the atmosphere through the chimney, and at the same time, the low-temperature flue gas in the chimney is used to take away the heat of the high-temperature flue gas in the heat dissipation pipe, so as to accelerate the cooling of the high-temperature flue gas, and the water generated in the reaction flows back through the return pipe three and the return pipe one.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the flue gas enters the SNCR denitrification mechanism after impurities are filtered out in the filtering mechanism, the ammonia production mechanism transports ammonia water to the SNCR denitrification mechanism, the flue gas and ammonia water react in the SNCR denitrification mechanism to generate nitrogen and water, the water flows back to the ammonia production mechanism for utilization, the flue gas enters the cooling mechanism to reduce the temperature, the flue gas enters the SCR denitrification mechanism after being reduced to a suitable temperature, the ammonia water and the flue gas in the SCR denitrification mechanism are further denitrified under the action of the catalyst, and the flue gas is discharged from the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0014] Figure 2 It is a partially enlarged cross-sectional axonometric structural schematic diagram of the filter mechanism of the utility model;

[0015] Figure 3 It is a schematic diagram of the cross-sectional axonometric structure of the SNCR denitration mechanism and the SCR denitration mechanism of the utility model;

[0016] Figure 4 It is a partially enlarged cross-sectional axonometric structural schematic diagram of the ammonia production mechanism of the utility model;

[0017] Figure 5 It is a partially enlarged cross-sectional axonometric structural schematic diagram of the cooling mechanism of the utility model.

[0018] Markings in the attached figure: 01, filter mechanism; 11, connecting flange; 12, filter box; 13, filter plate; 14, connecting pipe; 02, SNCR denitrification mechanism; 21, denitrification box 1; 22, water pipe 1; 23, metering water distributor 1; 24, nozzle 1; 25, return pipe 1; 26, connecting column; 03, ammonia production mechanism; 31, ammonia production cylinder; 32, gas pipe; 33, motor; 34, reducer; 35 , stirring rod; 36, water pump one; 37, water suction pipe; 38, water pump two; 39, return pipe two; 04, cooling mechanism; 41, heat pipe; 42, thermometer; 43, fan; 44, blades; 05, SCR denitrification mechanism; 51, denitrification box two; 52, bracket; 53, water pipe two; 54, metering water distributor two; 55, nozzle two; 56, catalyst reaction plate; 57, return pipe three; 58, chimney. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1

[0021] The utility model discloses an energy-saving SNCR+SCR combined denitration device, comprising a filtering mechanism 01; and also comprising an SNCR denitration mechanism 02, an ammonia making mechanism 03, a cooling mechanism 04 and an SCR denitration mechanism 05. The SNCR denitration mechanism 02 is installed on the filtering mechanism 01 and performs SNCR denitration on the flue gas. The ammonia making mechanism 03 is installed on the SNCR denitration mechanism 02 and transports ammonia water to the SNCR denitration mechanism 02 and the SCR denitration mechanism 05 respectively. The cooling mechanism 04 is installed on the SNCR denitration mechanism 02 and performs a cooling treatment on the flue gas. The SCR denitration mechanism 05 is installed on the cooling mechanism 04 and performs SC denitration on the flue gas. R denitration; the filtering mechanism 01 includes a connecting flange 11, a filter box 12, a filter plate 13 and a connecting pipe 14, the connecting flange 11 is connected to the inside of the boiler exhaust pipe, the filter box 12 is connected to the inside of the connecting flange 11, the filter plate 13 is installed in the filter box 12, and the connecting pipe 14 is connected to the inside of the filter plate 13; the SNCR denitration mechanism 02 includes a denitration box 21, a water pipe 22, a metering water distributor 23, multiple groups of nozzles 24, a return pipe 25 and four groups of connecting columns 26, a cavity is provided inside the denitration box 21, the cavity of the denitration box 21 is connected to the inside of the connecting pipe 14, the water pipe 22 is installed in the cavity of the denitration box 21, and the metering water distributor 23 is connected to the inside of the connecting pipe 14. A metering water distributor 23 is installed on a water delivery pipe 22 and communicated with the inside of the water delivery pipe 22, a plurality of nozzles 24 are evenly distributed and installed on the metering water distributor 23, the top of a return pipe 25 is communicated with the bottom of a denitrification tank 21, and the tops of four connecting columns 26 are connected with the bottom of the denitrification tank 21; an ammonia making mechanism 03 comprises an ammonia making cylinder 31, an air delivery pipe 32, an electric motor 33, a reducer 34, a stirring rod 35, a water pump 1 36, a water pumping pipe 37, a water pump 2 38 and a return pipe 2 39, the bottom end of the ammonia making cylinder 31 is connected with the top end of the denitrification tank 21, a chamber is arranged inside the ammonia making cylinder 31, the bottom end of the air delivery pipe 32 is connected with the top of the ammonia making cylinder 31 The bottom end of the motor 33 is connected to the top end of the ammonia making cylinder 31, the bottom end of the reducer 34 is connected to the top end of the ammonia making cylinder 31, the stirring rod 35 is rotatably installed in the chamber of the ammonia making cylinder 31 and is longitudinally connected to the reducer 34, the bottom end of the water pump 1 36 is connected to the top end of the ammonia making cylinder 31, the water delivery pipe 1 22 is internally connected to the water outlet of the water pump 1 36, the water pumping pipe 37 is installed on the water pump 1 36 and is connected to the inside of the chamber of the ammonia making cylinder 31, the bottom end of the water pump 2 38 is connected to the top end of the ammonia making cylinder 31, the return pipe 1 25 is connected to the water inlet of the water pump 2 38, and the return pipe 2 39 is installed on the water pump 2 38 and is connected to the inside of the chamber of the ammonia making cylinder 31;The SCR denitration mechanism 05 includes a denitration box 2 51, a bracket 52, a water pipe 2 53, a metering water distributor 2 54, a plurality of nozzles 2 55, a catalyst reaction plate 56, a return pipe 3 57 and a chimney 58. The top of the denitration box 2 51 is connected to the bottom end of the connecting column 26, and an inner cavity is arranged inside the bracket 52. The top of the bracket 52 is connected to the bottom end of the denitration box 2 51. The bottom end of the bracket 52 is installed on the ground. The water pipe 2 53 is installed at the top of the inner cavity of the denitration box 2 51 and the water pipe 2 53 is connected to the inside of the water pipe 1 22. The top of the metering water distributor 2 54 is connected to the bottom of the water pipe 2 53. The plurality of nozzles 2 55 are installed on the metering water distributor 2 54. The catalyst reaction plate 56 is installed on the return pipe 3 57. It is installed in the inner cavity of the denitrification box 2 51, the top of the return pipe 3 57 is connected to the bottom of the denitrification box 2 51, and the return pipe 3 57 is connected to the inside of the connecting column 26, and the chimney 58 is installed on the denitrification box 2 51 and is connected to the inner cavity of the denitrification box 2 51; when it is working, first, the flue gas in the boiler enters the filter box 12 through the connecting flange 11, and the large particles of impurities in the flue gas are filtered out by the filter plate 13 in the filter box 12, and the flue gas enters the cavity of the denitrification box 1 21 through the connecting pipe 14, and the chamber of the ammonia cylinder 31 is filled with clean water. The gas transmission pipe 32 transports the ammonia water to the chamber of the ammonia cylinder 31 to react with water to generate ammonia water, and at the same time, the motor 33 is started, and the motor 33 is driven by the reducer 3 4 drives the stirring rod 35 to rotate, and the stirring rod 35 stirs the clean water to accelerate the reaction of ammonia gas and water to generate ammonia water, and then the reducer 34 drives the water pump 36 to pump water, and the water pump 36 extracts the ammonia water through the water pumping pipe 37 and transports it to the metering water distributor 23 through the water delivery pipe 22, and the metering water distributor 23 measures the ammonia water and evenly distributes it to multiple groups of nozzles 24, and the nozzles 24 spray the ammonia water into the cavity of the denitrification box 21, and the flue gas reacts with the ammonia water to remove nitrogen oxides in the flue gas, and at the same time generates water and nitrogen, and the reducer 34 drives the water pump 2 38 to pump water, and the water pump 2 38 pumps the water in the cavity of the denitrification box 21 back through the return pipe 25 and replenishes it to the chamber of the ammonia cylinder 31 through the return pipe 2 39. , the flue gas enters the cooling mechanism 04, the flue gas drops to a suitable temperature, and then is transported to the inner cavity of the denitrification box 2 51, the water pipe 1 22 transports the ammonia water to the metering water distributor 2 54 through the water pipe 2 53, the metering water distributor 2 54 meters the ammonia water and evenly distributes it to multiple groups of nozzles 2 55, the nozzles 2 55 spray the ammonia water onto the catalyst reaction plate 56, the ammonia water and the flue gas react under the catalysis of the catalyst reaction plate 56, and a large amount of nitrogen oxides in the flue gas are decomposed, and then the flue gas is discharged into the atmosphere through the chimney 58, and at the same time, the low-temperature flue gas in the chimney 58 is used to take away the heat of the high-temperature flue gas in the cooling mechanism 04, accelerating the cooling of the high-temperature flue gas, and the water generated in the reaction flows back through the return pipe 3 57 and the return pipe 1 25. ;

[0022] Example 2

[0023] like Figures 1 to 5 As shown, an energy-saving SNCR+SCR combined denitration device of the utility model is based on Example 1; it also includes a cooling mechanism 04, the cooling mechanism 04 includes a heat dissipation pipe 41, two sets of thermometers 42, a fan 43 and a blade 44, the heat dissipation pipe 41 is installed on the denitration box 21 and communicates with the cavity inside the denitration box 21, the two sets of thermometers 42 are respectively installed at the head end and the tail end of the heat dissipation pipe 41, the fan 43 is installed between the two sets of connecting columns 26, and the blade 44 is installed on the fan 43; when it is working, first, the flue gas in the boiler enters the filter box 12 through the connecting flange 11, and is filtered out by the filter plate 13 in the filter box 12 The large particles of impurities in the flue gas enter the cavity of the denitrification box 21 through the connecting pipe 14. The chamber of the ammonia cylinder 31 is filled with clean water. The gas pipe 32 transports the ammonia water to the chamber of the ammonia cylinder 31 to react with water to generate ammonia water. At the same time, the motor 33 is started. The motor 33 drives the stirring rod 35 to rotate through the reducer 34. The stirring rod 35 stirs the clean water to accelerate the reaction of ammonia gas and water to generate ammonia water. Then the reducer 34 drives the water pump 36 to pump water. The water pump 36 pumps out the ammonia water through the pumping pipe 37 and transports it to the metering water distributor 23 through the water pipe 22. The metering water distributor 23 meters the ammonia water and evenly distributes it to multiple groups of nozzles 24. , the nozzle 24 sprays ammonia water into the cavity of the denitrification box 21, the flue gas reacts with the ammonia water to remove the nitrogen oxides in the flue gas, and generates water and nitrogen at the same time, the reducer 34 drives the water pump 2 38 to pump water, the water pump 2 38 pumps the water in the cavity of the denitrification box 21 back through the return pipe 25 and replenishes it to the chamber of the ammonia cylinder 31 through the return pipe 2 39, the flue gas enters the heat dissipation pipe 41, the flue gas temperature is measured by the thermometer 42 installed at the head end of the heat dissipation pipe 41, the fan 43 is started, the fan 43 drives the blade 44 to rotate, and the flue gas in the heat dissipation pipe 41 is cooled, and then the thermometer 42 at the tail end of the thermometer 42 measures the flue gas again to ensure that the flue gas It drops to a suitable temperature and is then transported to the inner cavity of the denitrification box 51. The water pipe 22 transports the ammonia water to the metering water distributor 54 through the water pipe 53. The metering water distributor 54 meters the ammonia water and evenly distributes it to multiple groups of nozzles 55. The nozzles 55 spray the ammonia water onto the catalyst reaction plate 56. The ammonia water and the flue gas react under the catalysis of the catalyst reaction plate 56 to decompose a large amount of nitrogen oxides in the flue gas. Then the flue gas is discharged into the atmosphere through the chimney 58. At the same time, the low-temperature flue gas in the chimney 58 is used to take away the heat of the high-temperature flue gas in the heat dissipation pipe 41, thereby accelerating the cooling of the high-temperature flue gas. The water generated in the reaction flows back through the return pipe 3 57 and the return pipe 25.

[0024] The motor 33, reducer 34, water pump 1 36, water pump 2 38 and fan 43 of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manuals, without the need for the technicians in this field to make creative efforts.

[0025] 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. An energy-saving SNCR+SCR combined denitration device, comprising a filtering mechanism (01); characterized in that: The system also includes a SNCR denitrification mechanism (02), an ammonia production mechanism (03), a cooling mechanism (04) and an SCR denitrification mechanism (05). The SNCR denitrification mechanism (02) is installed on the filtering mechanism (01) and performs SNCR denitrification on the flue gas. The ammonia production mechanism (03) is installed on the SNCR denitrification mechanism (02) and transports ammonia water to the SNCR denitrification mechanism (02) and the SCR denitrification mechanism (05), respectively. The cooling mechanism (04) is installed on the SNCR denitrification mechanism (02) and performs a cooling treatment on the flue gas. The SCR denitrification mechanism (05) is installed on the cooling mechanism (04) and performs SCR denitrification on the flue gas.

2. An energy-saving SNCR+SCR combined denitration device according to claim 1, characterized in that: The filter mechanism (01) comprises a connecting flange (11), a filter box (12), a filter plate (13) and a connecting pipe (14); the connecting flange (11) is connected to the interior of a boiler smoke exhaust pipe; the filter box (12) is connected to the interior of the connecting flange (11); the filter plate (13) is installed inside the filter box (12); and the connecting pipe (14) is connected to the interior of the filter plate (13).

3. An energy-saving SNCR+SCR combined denitration device as claimed in claim 2, characterized in that: The SNCR denitration mechanism (02) comprises a denitration box (21), a water delivery pipe (22), a metering water distributor (23), a plurality of nozzles (24), a return water pipe (25) and four connecting columns (26). A cavity is arranged inside the denitration box (21). The cavity of the denitration box (21) is connected to the inside of the connecting pipe (14). The water delivery pipe (22) is installed in the cavity of the denitration box (21). The metering water distributor (23) is installed on the water delivery pipe (22) and is connected to the inside of the water delivery pipe (22). The plurality of nozzles (24) are evenly distributed and installed on the metering water distributor (23). The top end of the return water pipe (25) is connected to the inside of the bottom end of the denitration box (21). The top ends of the four connecting columns (26) are connected to the bottom end of the denitration box (21).

4. An energy-saving SNCR+SCR combined denitration device as claimed in claim 3, characterized in that: The ammonia production mechanism (03) comprises an ammonia production cylinder (31), an air delivery pipe (32), an electric motor (33), a speed reducer (34), a stirring rod (35), a water pump (36), a water pump pipe (37), a water pump (38) and a water return pipe (39). The bottom end of the ammonia production cylinder (31) is connected to the top end of the denitration tank (21). A chamber is provided inside the ammonia production cylinder (31). The bottom end of the air delivery pipe (32) is connected to the top end of the ammonia production cylinder (31). The bottom end of the electric motor (33) is connected to the top end of the ammonia production cylinder (31). The bottom end of the speed reducer (34) is connected to the top end of the ammonia production cylinder (31). The stirring rod (35) is connected to the top end of the ammonia production cylinder (31). (35) is rotatably mounted in the chamber of the ammonia making cylinder (31) and is longitudinally connected to the reducer (34); the bottom end of the water pump one (36) is connected to the top end of the ammonia making cylinder (31); the water delivery pipe one (22) is connected to the inside of the water outlet of the water pump one (36); the water suction pipe (37) is mounted on the water pump one (36) and is connected to the inside of the chamber of the ammonia making cylinder (31); the bottom end of the water pump two (38) is connected to the top end of the ammonia making cylinder (31); the return pipe one (25) is connected to the water inlet of the water pump two (38); and the return pipe two (39) is mounted on the water pump two (38) and is connected to the inside of the chamber of the ammonia making cylinder (31).

5. The energy-saving SNCR+SCR combined denitration device according to claim 3, characterized in that: The cooling mechanism (04) comprises a heat dissipation pipe (41), two groups of thermometers (42), a fan (43) and blades (44); the heat dissipation pipe (41) is installed on the denitration box (21) and communicates with the interior of the cavity of the denitration box (21); the two groups of thermometers (42) are installed at the head end and the tail end of the heat dissipation pipe (41), respectively; the fan (43) is installed between the two groups of connecting columns (26); and the blades (44) are installed on the fan (43).

6. An energy-saving SNCR+SCR combined denitration device as claimed in claim 5, characterized in that: The SCR denitration mechanism (05) comprises a second denitration box (51), a bracket (52), a second water pipe (53), a second metering water distributor (54), a second plurality of nozzles (55), a catalyst reaction plate (56), a third water return pipe (57) and a chimney (58). The top of the second denitration box (51) is connected to the bottom of the connecting column (26), and an inner cavity is provided inside the bracket (52). The top of the bracket (52) is connected to the bottom of the second denitration box (51), and the bottom of the bracket (52) is installed on the ground. The second water pipe (53) is installed at the top of the inner cavity of the second denitration box (51). The water supply pipe 2 (53) is connected to the interior of the water supply pipe 1 (22), the top end of the metering water distributor 2 (54) is connected to the interior of the bottom end of the water supply pipe 2 (53), the plurality of nozzle groups 2 (55) are installed on the metering water distributor 2 (54), the catalyst reaction plate (56) is installed in the inner cavity of the denitration box 2 (51), the top end of the return pipe 3 (57) is connected to the interior of the bottom end of the denitration box 2 (51), and the return pipe 3 (57) is connected to the interior of the connecting column (26), and the chimney (58) is installed on the denitration box 2 (51) and is connected to the inner cavity of the denitration box 2 (51).

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