Integrated wet electric denitration device
The integrated wet electrostatic denitrification device, which combines a reaction chamber, electrode assembly, wet spray system, and liquid circulation unit, solves the problems of large size, high energy consumption, and difficult maintenance of existing denitrification devices. It achieves efficient and stable denitrification effect and low-cost operation, and is suitable for medium and small boilers and chemical tail gas treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI GAOYI STEEL CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-07-07
AI Technical Summary
Existing technologies lack compact denitrification devices that integrate electric field discharge, wet spray absorption, and online recycling, resulting in large equipment size, high energy consumption, high operating costs, and high maintenance difficulty. Furthermore, the spray liquid has low recovery rate, is prone to clogging, and is difficult to control online pH, which limits its application in the treatment of medium and small boilers and chemical exhaust gases.
An integrated wet electrostatic denitrification device was designed, including a reaction chamber, electrode assembly, wet spray system, power control unit and liquid circulation unit. It adopts honeycomb porous electrode assembly, standard flange connection, online pH detection module and automatic adjustment dosing system to realize closed-loop recycling and intelligent control of denitrification liquid.
It features a compact structure, stable operation, easy maintenance, and high denitrification efficiency, reducing the consumption of denitrification agents and operating costs, ensuring optimal activity of the spray liquid and compliance with emission standards, and is suitable for the treatment of medium and small boilers and chemical tail gas.
Smart Images
Figure CN224462523U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste gas treatment technology, and in particular to an integrated wet electrostatic denitrification device. Background Technology
[0002] Currently, there is a lack of compact denitrification devices that integrate electric field discharge, wet spray absorption, and online recycling. Traditional separate arrangements of electrochemical and chemical absorption result in large equipment size, high energy consumption, high operating costs, and high maintenance difficulty. Furthermore, the low recovery rate of the spray liquid, easy clogging, and difficulty in controlling the online pH limit its application in the treatment of medium and small boilers and chemical tail gas. Therefore, there is an urgent need for an integrated wet electrostatic denitrification device that is compact in structure, stable in operation, easy to maintain, highly efficient in denitrification, and capable of closed-loop recycling of the denitrification liquid to meet increasingly stringent environmental emission requirements. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides an integrated wet electrostatic denitrification device, which solves the problems mentioned in the background section.
[0004] To achieve the above objectives, this utility model provides the following technical solution: an integrated wet electrostatic denitrification device, comprising a reaction chamber, an electrode assembly, a wet spray system, a power control unit, and a liquid circulation unit. The reaction chamber is used to load the gas to be treated. The outer side of the electrode assembly is bolted to the inside of the reaction chamber. The electrode assembly includes an anode and a cathode, which are arranged opposite to each other. The output end of the wet spray system is connected to the top of the reaction chamber for spraying denitrification liquid into the reaction chamber. One side of the power control unit is electrically connected to the electrode assembly to provide a pulsed DC electric field. The liquid circulation unit is fixedly connected to the wet spray system and the bottom of the reaction chamber via a flange for recovering and recycling the denitrification liquid.
[0005] As a further technical solution of this utility model, the electrode assembly adopts a honeycomb porous structure and is fixed to the inner wall of the reaction chamber by bolts through an insulating support frame. The support frame is made of polytetrafluoroethylene to ensure electrical insulation.
[0006] As a further technical solution of this utility model, the wet spraying system is connected to the top flange of the reaction tank through a standard flange, and a rubber sealing gasket is set between the flanges to ensure sealing and facilitate disassembly and maintenance.
[0007] As a further technical solution of this utility model, the power control unit is connected to the electrode assembly through a waterproof junction box and a standard aviation plug, and the junction box is fastened to the outer wall of the reaction chamber by bolts.
[0008] As a further technical solution of this utility model, the liquid circulation unit pipeline is connected by a stainless steel flexible hose and is detachably connected to the spray system and the bottom flange of the reaction tank through a quick connector.
[0009] As a further technical solution of this utility model, it also includes a post-filtration separation unit, which is connected to the outlet flange of the reaction tank via a flange, and is equipped with a clamp-type quick-release device to facilitate filter element replacement.
[0010] As a further technical solution of this utility model, it also includes an online pH detection module and an automatic dosing system. The online pH detection module is connected to the side flange of the reaction tank via a threaded connector, and the dosing system is connected to the bottom circulation pipeline of the reaction tank via a hose and a buckle.
[0011] As a further technical solution of this utility model, a touch screen human-machine interface is electrically connected to one side of the power control unit. The touch screen human-machine interface is fixed to the device frame through a panel mounting frame. The frame adopts a bolt connection structure to meet the disassembly and assembly requirements.
[0012] As a further technical solution of this utility model, a microfiltration membrane is provided between the wet spraying system and the liquid circulation unit. The microfiltration membrane assembly is connected to the pipeline by a clamp, and a sealing O-ring is provided at the clamp.
[0013] As a further technical solution of this utility model, the fasteners and seals used in each connection part are made of 316L stainless steel or fluororubber with excellent corrosion resistance, so as to adapt to the corrosive environment of wet electric field and chemical reagent.
[0014] This utility model provides an integrated wet electrostatic denitrification device, which has the following advantages compared with the prior art:
[0015] 1. The wet electrostatic denitrification integrated device designed in this paper continuously circulates and recovers the denitrification liquid through a wet spray system and the bottom of the reaction tank via stainless steel hoses and quick connectors. Combined with a post-filtration separation unit to remove solid impurities and periodically replace the filter element, it can operate stably for a long time and significantly reduce the consumption of denitrification agent and operating costs.
[0016] 2. The wet electrostatic denitrification integrated device designed in this paper adopts a honeycomb porous structure for the electrode assembly to increase the specific surface area; and is fixed to the inner wall of the reaction chamber by bolts through a polytetrafluoroethylene insulating support frame to ensure electrical insulation and facilitate disassembly and assembly.
[0017] 3. The wet electrostatic denitrification integrated device designed in this paper adopts standard flanges, rubber gaskets or microfiltration membranes, and clamp-type quick-release devices for the wet spray system and the top flange of the reaction tank, as well as the circulation pipeline and the bottom flange, so that the sealing is reliable and maintenance is quick.
[0018] 4. This design is a wet electrostatic denitrification integrated device. The electrodes are connected to the aviation plug through a waterproof junction box. The touch screen human-machine interface is connected to the frame by bolts through a panel mounting frame. The overall frame is modularly designed, which facilitates on-site assembly, disassembly and maintenance.
[0019] 5. The wet electrostatic denitrification integrated device designed in this paper is equipped with an online pH detection module and an automatic dosing system. It can monitor the acidity and alkalinity of the solution in real time and automatically add reducing agent according to the detection results to ensure the optimal denitrification activity of the spray liquid and realize unattended intelligent operation. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of an integrated wet electrostatic denitrification device;
[0021] Figure 2 This is a schematic diagram of the reaction chamber structure of an integrated wet electrostatic denitrification device;
[0022] Figure 3 This is a schematic cross-sectional elevation view of the reaction chamber of an integrated wet electrostatic denitrification device.
[0023] Figure 4 A schematic diagram of the liquid circulation unit structure of an integrated wet electrostatic denitrification device;
[0024] Figure 5 This is a schematic diagram of the filtration and separation unit structure of an integrated wet electrostatic denitrification device.
[0025] In the diagram: 1. Reaction chamber; 2. Electrode assembly; 23. Insulating support frame; 3. Wet spray system; 4. Power control unit; 41. Waterproof junction box; 5. Liquid circulation unit; 51. Stainless steel hose; 6. Filtration and separation unit; 7. pH detection module; 8. Dosing system; 9. Touch screen. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0027] Please see Figure 1-5 This utility model provides a technical solution for an integrated wet electrostatic denitrification device:
[0028] like Figure 3 , Figure 4 and Figure 5As shown, the system includes a reaction chamber 1, an electrode assembly 2, a wet spray system 3, a power control unit 4, and a liquid circulation unit 5. The reaction chamber 1 is used to load the gas to be treated. It is equipped with a 30° inclined guide plate inside, which allows the spray liquid to flow back to the bottom circulation port along the inner wall. It is sealed and has a fluid guiding function to ensure that the gas phase and liquid phase mix and reside in the electric field and spray zone for ≥2s, so as to achieve sufficient mass transfer and electrochemical reaction. The outer side of the electrode assembly 2 is bolted to the inside of the reaction chamber 1. The electrode assembly 2 includes an anode and a cathode. The 5kV / 100Hz pulsed DC power output by the power control unit 4 is sent to the electrode through the wire to form a uniform electric field. In the electric field, water molecules are ionized to generate active species such as ·OH and ·O2⁻, and NOx is electrochemically reduced on the electrode surface. The anode and cathode are arranged opposite each other. The output end of the wet spray system 3 is connected to the top of the reaction chamber 1, and a 0.05T liquid is integrated in the spray liquid inlet pipe. A 2μm microfiltration membrane module effectively intercepts impurities. The denitrification liquid atomized by the nozzle interacts with the airflow in the electric field zone, promoting the rapid absorption and chemical reduction of NOx in the gas phase, increasing the gas-liquid contact area and reaction rate, and reducing spray dead zones. It is used to spray the denitrification liquid into the reaction tank 1. One side of the power control unit 4 is electrically connected to the electrode assembly 2. The PLC communicates with the touch screen 9 and the dosing system 8 to achieve linkage control. According to the real-time load and liquid phase pH, the electric field strength and pulse frequency are automatically adjusted to optimize energy consumption and denitrification efficiency. It is used to provide a pulsed DC electric field. The liquid circulation unit 5 is fixedly connected to the wet spray system 3 and the bottom of the reaction tank 1 through a flange. It is used to recover and recycle the denitrification liquid. The circulation pump sends the bottom return liquid through the buffer tank and filter screen to the spray system to form a closed loop circulation, ensuring a stable flow rate of 50-200L / h and spray liquid concentration, continuously purifying and reusing the denitrification liquid.
[0029] like Figure 3 As shown, the electrode assembly 2 adopts a honeycomb porous structure and is fixed to the inner wall of the reaction chamber 1 by bolts through an insulating support frame 23. The support frame is made of polytetrafluoroethylene to ensure electrical insulation.
[0030] like Figure 2 and Figure 3 As shown, the wet spray system 3 is connected to the top flange of the reaction tank 1 via a standard flange, and a rubber sealing gasket is installed between the flanges to ensure sealing and facilitate disassembly and maintenance.
[0031] like Figure 1 and Figure 3 As shown, the power control unit 4 is connected to the electrode assembly 2 via a waterproof junction box 41 and a standard aviation plug. The junction box is fastened to the outer wall of the reaction chamber 1 by bolts.
[0032] like Figure 4 and Figure 5As shown, the pipeline of the liquid circulation unit 5 is connected by a stainless steel hose 51 and is detachably connected to the wet spray system 3 and the bottom flange of the reaction tank 1 via quick connectors.
[0033] like Figure 2 and Figure 5 As shown, it also includes a post-filtration and separation unit 6, which is connected to the outlet flange of the reaction chamber 1 via a flange and is equipped with a clamp-type quick-release device to facilitate filter replacement. The exhaust gas passes through this unit to remove residual droplets and particles before being discharged into the atmosphere, ensuring that the emission particulate matter is <5mg / m³, which meets the emission standards.
[0034] like Figure 4 As shown, it also includes an online pH detection module 7 and an automatic dosing system 8. The online pH detection module 7 is connected to the side flange of the reaction tank 1 via a threaded connector, and sends the pH signal to the PLC in real time. The dosing system 8 adjusts the dosage of the chemical solution accordingly to maintain the pH of the spray solution in the optimal range of 5.5–6.5, thereby improving the denitrification reaction rate. The dosing system 8 is connected to the circulation pipeline at the bottom of the reaction tank 1 via a hose and a buckle, and automatically adds NaHSO3 or NaOH according to the pH deviation, with closed-loop regulation to ensure the chemical activity of the spray solution and reduce manual intervention.
[0035] like Figure 1 As shown, a touch screen human-machine interface 9 is electrically connected to one side of the power control unit 4. The touch screen human-machine interface 9 is fixed to the device frame through a panel mounting frame. The frame adopts a bolt connection structure to meet the disassembly and assembly requirements. It communicates in real time with the PLC, power control unit 4, and dosing system 8 to realize integrated visual management and improve operation and maintenance efficiency and safety.
[0036] like Figure 4 As shown, a microfiltration membrane is installed between the wet spray system 3 and the liquid circulation unit 5. The microfiltration membrane assembly is connected to the pipeline by clamps, and a sealing O-ring is installed at the clamps.
[0037] like Figure 2 As shown, the fasteners and seals used in each connection part are made of 316L stainless steel or fluororubber with excellent corrosion resistance to adapt to the corrosive environment of wet electric field and chemical reagents.
[0038] The working principle of this invention is as follows: First, NOx-containing waste gas enters through the inlet of reaction chamber 1. Under the action of the pulsed DC electric field provided by the power control unit 4, a high-intensity discharge zone is formed between the anode and cathode in the electrode assembly 2. NO and NO2 in the gas phase are electrochemically reduced or oxidized on the electrode surface, partially converting into soluble nitrite NO2⁻ and nitrate NO3⁻. Simultaneously, water molecules are decomposed to produce active free radicals such as ·OH and ·O2⁻, creating a prerequisite for subsequent chemical absorption. Second, the wet spray system 3 sprays a denitrification liquid containing reducing agents such as sodium bisulfite or urea solution into the top of reaction chamber 1 through multi-head atomizing nozzles, forming fine droplets. The pre-electrochemically treated gaseous NOx and the spray liquid spiral back along the chamber wall under the action of the inclined guide plate, achieving full contact between the gas and liquid interfaces. The reducing agent in the spray solution undergoes chemical reduction with NO⁻ / NO⁻ to generate soluble salts, which further react synergistically with the active species in the electric field, significantly improving denitrification efficiency. Finally, the exhaust gas after spraying enters the post-filtration and separation unit 6 from the rear of the tank, where residual droplets and particles are intercepted by the clamp-type filter element assembly and purified to meet emission standards. Simultaneously, the denitrification liquid enters the liquid circulation unit 5 from the bottom of the tank, where it is purified by a circulation pump, microfiltration membrane, and buffer tank before being returned to the spray system. An online pH detection module 7 monitors the pH of the circulating liquid in real time and automatically adjusts the dosing system 8 to replenish the reducing agent to maintain the optimal pH of 5.5–6.5. A touchscreen human-machine interface 9 centrally displays and controls parameters such as voltage, current, flow rate, and pH, achieving unattended intelligent operation.
[0039] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model are implemented according to conventional methods in the art, unless otherwise specified or limited.
Claims
1. A wet electrostatic denitrification integrated device, characterized in that, The system includes a reaction chamber (1), an electrode assembly (2), a wet spray system (3), a power control unit (4), and a liquid circulation unit (5). The reaction chamber (1) is used to load the gas to be treated. The outer side of the electrode assembly (2) is bolted to the inside of the reaction chamber (1). The electrode assembly (2) includes an anode and a cathode, which are arranged opposite to each other. The output end of the wet spray system (3) is connected to the top of the reaction chamber (1) and is used to spray denitrification liquid into the reaction chamber (1). One side of the power control unit (4) is electrically connected to the electrode assembly (2) and is used to provide a pulsed DC electric field. The liquid circulation unit (5) is fixedly connected to the bottom of the wet spray system (3) and the reaction chamber (1) through a flange and is used to recover and recycle the denitrification liquid.
2. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The electrode assembly (2) adopts a honeycomb porous structure and is fixed to the inner wall of the reaction chamber (1) by bolts through an insulating support frame (23). The support frame is made of polytetrafluoroethylene to ensure electrical insulation.
3. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The wet spray system (3) is connected to the top flange of the reaction tank (1) via a standard flange, and a rubber sealing gasket is provided between the flanges to ensure sealing and facilitate disassembly and maintenance.
4. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The power control unit (4) is connected to the electrode assembly (2) via a waterproof junction box (41) and a standard aviation plug, the junction box being fastened to the outer wall of the reaction chamber (1) by bolts.
5. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The liquid circulation unit (5) is connected by a stainless steel hose (51) and is detachably connected to the wet spray system (3) and the bottom flange of the reaction tank (1) via a quick connector.
6. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, It also includes a post-filtration separation unit (6), which is connected to the outlet flange of the reaction tank (1) via a flange and is equipped with a clamp-type quick-release device to facilitate filter element replacement.
7. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, It also includes an online pH detection module (7) and an automatic dosing system (8). The online pH detection module (7) is connected to the side flange of the reaction chamber (1) via a threaded connector, and the dosing system (8) is connected to the bottom circulation pipeline of the reaction chamber (1) via a hose and a buckle.
8. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The power control unit (4) is electrically connected to a touch screen human-machine interface (9) on one side. The touch screen human-machine interface (9) is fixed to the device frame through a panel mounting frame. The frame adopts a bolt connection structure to meet the disassembly and assembly requirements.
9. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, A microfiltration membrane is installed between the wet spray system (3) and the liquid circulation unit (5). The microfiltration membrane assembly is connected to the pipeline by a clamp, and a sealing O-ring is installed at the clamp.
10. The integrated wet electrostatic denitrification device according to claim 1, characterized in that, The fasteners and seals used in each connection part are made of 316L stainless steel or fluororubber with excellent corrosion resistance to adapt to the corrosive environment of wet electric field and chemical reagents.