Urea hydrolysis device based on SCR denitration system

Abstract

The utility model provides a urea hydrolysis device based on an SCR (Selective Catalytic Reduction) denitration system, which comprises a feeding pump, a feeding self-control valve arranged at one end of the feeding pump, a urea hydrolysis device arranged at one end of the feeding self-control valve, a gas self-control valve arranged on one side of the urea hydrolysis device, a grating mixing device arranged at one end of the gas self-control valve, and a gas mixing device arranged at the other end of the gas self-control valve. And a reactor is arranged at one end of the grid mixing device. The utility model provides a urea hydrolysis device based on an SCR (Selective Catalytic Reduction) denitration system, which is characterized in that a feeding pump is matched with a feeding self-control valve, the urea hydrolysis device, a gas self-control valve, a grid mixing device, a reactor, a first-layer catalyst, a second-layer catalyst, a third-layer catalyst and a heat exchange system, so that about percent of urea solution is conveyed to the urea hydrolysis device; the urea solution is hydrolyzed into an NH-based mixture, a reducing agent is provided for SCR denitration reaction, chemical reaction is guaranteed, and boiler flue gas nitric oxide meets the ultralow emission requirement.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification, and in particular to a urea hydrolysis device based on an SCR denitrification system. Background Technology

[0002] There are two main types of flue gas denitrification technology: dry and wet. Compared with wet flue gas denitrification technology, the main advantages of dry flue gas denitrification technology are: lower basic investment, simpler equipment and process, higher NOx removal efficiency, no wastewater or waste treatment, and less likelihood of causing secondary pollution.

[0003] Various boiler flue gas requires denitrification. Due to the limitations of on-site safety management in the supply system of reducing agent for SCR denitrification system, the transportation and storage of reducing agent NH3 system are too difficult to manage, and the source of reducing agent NH3 is limited, which affects the flue gas denitrification process.

[0004] Therefore, it is necessary to provide a urea hydrolysis device based on an SCR denitrification system to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a urea hydrolysis device based on an SCR denitrification system, which solves the problems of the current NH3 reducing agent system, such as the difficulty in transportation and storage management, and the limited source of NH3 reducing agent, which affect the flue gas denitrification process.

[0006] To solve the above-mentioned technical problems, this utility model provides a urea hydrolysis device based on an SCR denitrification system, comprising:

[0007] A feed pump is provided, with a feed control valve at one end, a urea hydrolysis device at one end of the feed control valve, a gas control valve at one side of the urea hydrolysis device, a grid mixing device at one end of the gas control valve, a reactor at one end of the grid mixing device, a first layer of catalyst, a second layer of catalyst, and a third layer of catalyst inside the reactor, and a heat exchange device at one side of the reactor.

[0008] A wastewater treatment system is installed on one side of the reactor.

[0009] Preferably, a regulating valve is provided at one end of the reactor, an air inlet pipe is provided at one end of the regulating valve, an outlet regulating valve is provided at one end of the reactor, and a deaerator is provided at one end of the outlet regulating valve.

[0010] Preferably, a control valve is provided at one end of the feed pump, and a water supply device is provided on the surface of the control valve.

[0011] Preferably, the wastewater treatment system includes a sedimentation tank, and a driving device is provided on the top of the sedimentation tank. The driving device includes a servo motor, a threaded rod, a threaded block, a lifting component, and a filter frame. The servo motor is fixedly installed on one side of the sedimentation tank, the threaded rod is located at the output end of the servo motor, the threaded block is threadedly connected to the surface of the threaded rod, one side of the lifting component is fixedly installed on one side of the threaded block, and the top of the filter frame is fixedly installed on one end of the lifting component.

[0012] Preferably, the sedimentation tank is rotatably connected to a baffle, and a magnet is fixedly connected to the inside of the baffle.

[0013] Preferably, a sliding rod is fixedly connected to the top of the sedimentation tank, and a sliding block is slidably connected to the surface of the sliding rod.

[0014] Preferably, a rotating motor is fixedly installed inside the filter frame, and the output end of the rotating motor is connected to a diverter pipe. Multiple nozzles are fixedly installed on the surface of the diverter pipe, and a delivery pipe is fixedly installed on the surface of the diverter pipe.

[0015] Compared with related technologies, the urea hydrolysis device based on the SCR denitrification system provided by this utility model has the following beneficial effects:

[0016] This invention provides a urea hydrolysis device based on an SCR denitrification system. Through a feed pump in conjunction with a feed control valve, a urea hydrolysis device, a gas control valve, a grid mixing device, a reactor, a first-layer catalyst, a second-layer catalyst, a third-layer catalyst, and a heat exchange system, approximately 90% urea solution is fed to the urea hydrolysis device. This hydrolysis reaction produces an NH-based mixture, providing a reducing agent for the SCR denitrification reaction, ensuring the chemical reaction proceeds, and achieving ultra-low emission requirements for nitrogen oxides in boiler flue gas. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of a first embodiment of a urea hydrolysis device based on an SCR denitrification system provided by this utility model;

[0018] Figure 2 A schematic diagram of the structure of a second embodiment of a urea hydrolysis device based on an SCR denitrification system provided by this utility model;

[0019] Figure 3 for Figure 2 The diagram shown is a structural schematic of the sedimentation tank.

[0020] Figure 4 for Figure 3 The diagram shows the structure of the filter frame.

[0021] The diagram labels are as follows: 1. Feed pump; 2. Feed control valve; 3. Urea hydrolysis unit; 4. Gas control valve; 5. Grille mixing unit; 6. Reactor; 7. First catalyst layer; 8. Second catalyst layer; 9. Third catalyst layer; 10. Heat exchange system.

[0022] 11. Air inlet pipe; 12. Automatic control valve; 13. Condensate outlet control valve; 14. Deaerator; 15. Wastewater treatment system; 16. Water station; 17. Control valve.

[0023] 18. Sedimentation tank; 19. Drive unit; 191. Servo motor; 192. Threaded rod; 193. Threaded block; 194. Lifting component; 195. Filter frame; 20. Baffle; 21. Magnet; 22. Sliding rod; 23. Sliding block; 24. Rotary motor; 241. Diverter pipe; 242. Nozzle; 243. Conveying pipe. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] First Embodiment

[0026] Please refer to the following: Figure 1 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a urea hydrolysis device based on an SCR denitrification system provided by this utility model. A urea hydrolysis device based on an SCR denitrification system includes:

[0027] A feed pump 1 is provided with a feed control valve 2 at one end of the feed pump 1, a urea hydrolysis device 3 at one end of the feed control valve 2, a gas control valve 4 at one side of the urea hydrolysis device 3, a grid mixing device 5 at one end of the gas control valve 4, a reactor 6 at one end of the grid mixing device 5, a first catalyst layer 7, a second catalyst layer 8, and a third catalyst layer 9 inside the reactor 6, and a heat exchange device 10 at one side of the reactor 6.

[0028] A wastewater treatment system 15 is provided on one side of the reactor 6.

[0029] The urea hydrolysis device 3 is connected to the grid mixing device 5 through a connecting pipe. The gas self-control valve 4 is fixedly installed on the surface of the connecting pipe, and one end of the grid mixing device 5 is fixedly installed on one side of the reactor 6.

[0030] A heat exchange device 10 is fixed on one side of the reactor 6.

[0031] Reactor 6 is connected to wastewater treatment system 15 via pipes.

[0032] One end of the reactor 6 is provided with a regulating valve 12, one end of the regulating valve 12 is provided with an air inlet pipe 11, one end of the reactor 6 is provided with an outlet regulating valve 13, and one end of the outlet regulating valve 13 is provided with a deaerator 14.

[0033] The air intake pipe 11 is connected to the urea hydrolysis device 3 via a pipe, and the self-regulating valve 12 is fixedly installed on the surface of the pipe.

[0034] The deaerator 14 is connected to the urea hydrolysis unit 3 via a pipeline, and the outlet regulating valve 13 is fixedly installed on the surface of the pipeline.

[0035] A control valve 17 is provided at one end of the feed pump 1, and a water supply device 16 is provided on the surface of the control valve 17.

[0036] The feed pump 1 is connected to the urea hydrolysis device 3 through a pipeline, and the feed control valve 2 is fixedly installed on the surface of the pipeline. At the same time, the control valve 17 is also fixedly installed on the surface of the pipeline. The water supply device 16 is connected to the control valve 17 through a pipeline. The water supply device 16 is a water station.

[0037] Steam heating system: Steam at T190℃ and P1.27MPa enters the urea hydrolysis unit 3 through the inlet pipe 11 and the steam self-control regulating valve 12. The steam condensate is sent to the boiler deaerator 14 through the condensate outlet regulating valve 13 to achieve the purpose of energy saving and consumption reduction.

[0038] The waste liquid after hydrolysis of urea is sent to the sewage treatment system 15. The urea hydrolysis waste liquid can be used as a nutrient solution for cultivating bacteria in sewage treatment, thus achieving comprehensive utilization of waste to produce energy.

[0039] Flushing desalination system: Flushing desalination water comes from chemical water supply device 16 and enters the urea solution delivery pipeline through flushing desalination water control valve 17 for intermittent flushing to prevent urea crystallization from clogging the pipeline.

[0040] The working principle of the urea hydrolysis device based on the SCR denitrification system provided by this utility model is as follows:

[0041] During use, approximately 40% of the urea solution comes from the feed pump 1, passes through the urea solution feed control valve 2 and enters the urea hydrolysis device 3, the ammonia-containing mixed gas control valve 4, enters the ammonia injection grid mixing device 5 and mixes with the boiler flue gas inlet before entering the SCR denitrification reactor 6, and then sequentially enters the first catalyst layer 7, the second catalyst layer 8, and the third catalyst layer 9. After denitrification and purification, the flue gas enters the heat exchange system 10.

[0042] Compared with related technologies, the urea hydrolysis device based on the SCR denitrification system provided by this utility model has the following beneficial effects:

[0043] This invention provides a urea hydrolysis device based on an SCR denitrification system. The device uses a feed pump 1 in conjunction with a feed control valve 2, a urea hydrolysis unit 3, a gas control valve 4, a grid mixing device 5, a reactor 6, a first-layer catalyst 7, a second-layer catalyst 8, a third-layer catalyst 9, and a heat exchange system 10 to deliver approximately 40% urea solution to the urea hydrolysis unit. This hydrolysis reaction produces an NH3-based mixture, providing a reducing agent for the SCR denitrification reaction, ensuring the chemical reaction proceeds, and achieving ultra-low emission requirements for nitrogen oxides in boiler flue gas.

[0044] Second Embodiment

[0045] Please refer to the following: Figure 2 , Figure 3 and Figure 4 Based on the first embodiment of this application, which provides a urea hydrolysis device based on an SCR denitrification system, the second embodiment of this application proposes another urea hydrolysis device based on an SCR denitrification system. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0046] Specifically, the second embodiment of this application provides a urea hydrolysis device based on an SCR denitrification system, which differs in that the wastewater treatment system 15 includes a sedimentation tank 18. A drive device 19 is provided on the top of the sedimentation tank 18. The drive device 19 includes a servo motor 191, a threaded rod 192, a threaded block 193, a lifting component 194, and a filter frame 195. The servo motor 191 is fixedly installed on one side of the sedimentation tank 18. The threaded rod 192 is located at the output end of the servo motor 191. The threaded block 193 is threadedly connected to the surface of the threaded rod 192. One side of the lifting component 194 is fixedly installed on one side of the threaded block 193. The top of the filter frame 195 is fixedly installed on one end of the lifting component 194.

[0047] One end of the threaded rod 192 is rotatably connected to one side of the inner wall of the sedimentation tank 18.

[0048] The lifting component 194 is a hydraulic rod used to move the filter frame 195.

[0049] The sedimentation tank 18 is rotatably connected to a baffle 20, and a magnet 21 is fixedly connected to the inside of the baffle 20.

[0050] The baffle 20 is an L-shaped plate, and magnets 21 are also fixedly connected inside the sedimentation tank 18. After the baffle 20 is rotated to one side to a suitable position, the two magnets 21 attract each other and limit the position of the baffle 20.

[0051] A sliding rod 22 is fixedly connected to the top of the sedimentation tank 18, and a sliding block 23 is slidably connected to the surface of the sliding rod 22.

[0052] A lifting component 194 is also fixedly installed on one side of the sliding block 23, and one end of the two lifting components 194 is fixedly installed at both ends of the top of the filter frame 195.

[0053] A rotating motor 24 is fixedly installed inside the filter frame 195. The output end of the rotating motor 24 is connected to a diversion pipe 241. Multiple nozzles 242 are fixedly installed on the surface of the diversion pipe 241, and a delivery pipe 243 is fixedly installed on the surface of the diversion pipe 241.

[0054] One end of the diversion pipe 241 is rotatably connected to one end of the inner wall of the filter frame 195.

[0055] The working principle of the urea hydrolysis device based on the SCR denitrification system provided by this utility model is as follows:

[0056] In use, by activating the two lifting components 194, the filter frame 195 is moved downward to a suitable position in the sedimentation tank 18. Then, by activating the servo motor 191, the threaded rod 192 is rotated to one side, causing the threaded block 193 to move to one side on the surface of the threaded rod 192. When the threaded block 193 moves to one side, it drives the lifting component 194 connected to the filter frame 195 to move to one side, thereby driving the other lifting component 194 connected to the sliding block 23 to move to a suitable position on the surface of the sliding rod 22.

[0057] After the two lifting components 194 are activated to retract and reset the filter block 195, the filter frame 195 is moved to one side by the servo motor 191, which pushes one end of the baffle 20 to rotate to one side. After rotating from a horizontal position to a vertical position, the baffle 20 is limited by the magnet 21.

[0058] Water is delivered into the diversion pipe 241 via an externally connected water pump through the delivery pipe 243 and sprayed out through multiple nozzles 242. At the same time, the rotating motor 24 is started to rotate half a circle back and forth, thereby driving the diversion pipe 241 to rotate back and forth, so that the nozzles 242 can better backwash both sides of the filter frame 195.

[0059] Compared with related technologies, the urea hydrolysis device based on the SCR denitrification system provided by this utility model has the following beneficial effects:

[0060] This utility model provides a urea hydrolysis device based on an SCR denitrification system. The drive device 19, in conjunction with the sliding rod 22 and the sliding block 23, enables the filter frame 195 to filter and remove floating particles in the sedimentation tank. The rotating motor 24, in conjunction with the diversion pipe 241, the nozzle 242 and the conveying pipe 243, cleans the filter frame 195.

[0061] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A urea hydrolysis device based on an SCR denitrification system, characterized in that, include: A feed pump is provided, with a feed control valve at one end, a urea hydrolysis device at one end of the feed control valve, a gas control valve at one side of the urea hydrolysis device, a grid mixing device at one end of the gas control valve, a reactor at one end of the grid mixing device, a first layer of catalyst, a second layer of catalyst, and a third layer of catalyst inside the reactor, and a heat exchange device at one side of the reactor. A wastewater treatment system is installed on one side of the reactor.

2. The urea hydrolysis device based on an SCR denitrification system according to claim 1, characterized in that, A regulating valve is provided at one end of the reactor, an air inlet pipe is provided at one end of the regulating valve, an outlet regulating valve is provided at one end of the reactor, and a deaerator is provided at one end of the outlet regulating valve.

3. The urea hydrolysis device based on an SCR denitrification system according to claim 1, characterized in that, A control valve is provided at one end of the feed pump, and a water supply device is provided on the surface of the control valve.

4. The urea hydrolysis device based on an SCR denitrification system according to claim 1, characterized in that, The wastewater treatment system includes a sedimentation tank, and a driving device is installed on the top of the sedimentation tank. The driving device includes a servo motor, a threaded rod, a threaded block, a lifting component, and a filter frame. The servo motor is fixedly installed on one side of the sedimentation tank, the threaded rod is located at the output end of the servo motor, the threaded block is threadedly connected to the surface of the threaded rod, one side of the lifting component is fixedly installed on one side of the threaded block, and the top of the filter frame is fixedly installed on one end of the lifting component.

5. A urea hydrolysis device based on an SCR denitrification system according to claim 4, characterized in that, The sedimentation tank is rotatably connected to a baffle, and a magnet is fixedly connected to the inside of the baffle.

6. A urea hydrolysis device based on an SCR denitrification system according to claim 5, characterized in that, A sliding rod is fixedly connected to the top of the sedimentation tank, and a sliding block is slidably connected to the surface of the sliding rod.

7. A urea hydrolysis device based on an SCR denitrification system according to claim 4, characterized in that, A rotating motor is fixedly installed inside the filter frame. The output end of the rotating motor is connected to a diverter pipe. Multiple nozzles are fixedly installed on the surface of the diverter pipe, and a delivery pipe is fixedly installed on the surface of the diverter pipe.

Images