An environmentally friendly purification treatment method and system
By using urea solution to absorb nitrogen oxides in flue gas in a high-temperature environment, and combining it with a PLC system and visual early warning, the problems of ammonia consumption and escape in SCR technology are solved, achieving efficient and precise flue gas denitrification and purification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG YINGTIAN ENVIRONMENTAL PROTECTION EQUIP CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-06-02
AI Technical Summary
Existing SCR technology consumes a large amount of ammonia during the denitrification process and poses a risk of ammonia escape, making it impossible to purify flue gas precisely and controllably.
The system uses urea solution to absorb nitrogen oxides in flue gas in a high-temperature environment. The PLC system enables automated control, combined with visual early warning and intelligent analysis, to regulate the dosage of urea solution and the flow rate of flue gas. Precise denitrification is achieved using a high-temperature reaction chamber and spraying components.
It achieves efficient and precise flue gas denitrification and purification, significantly improves purification efficiency, can flexibly cope with flue gas of different concentrations, and reduces the use and escape risks of ammonia.
Smart Images
Figure CN122124626A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of environmental engineering, specifically relating to an environmental purification treatment method and system. Background Technology
[0002] Pollutant gas treatment is an important part of environmental engineering. Coal combustion easily produces flue gas containing nitrogen oxides, which can pollute the atmosphere. The treatment of nitrogen oxides typically involves controlling, recovering, or utilizing nitrogen oxides (NOx) in the waste gas. x ), or NO x Harmless treatment is required. In existing technologies, traditional SCR (Selective Catalytic Reduction) denitrification often consumes large amounts of ammonia and carries the risk of ammonia escape, failing to precisely and controllably purify flue gas. To further improve the environmental friendliness of the purification process, new technological solutions are urgently needed to address these issues. Summary of the Invention
[0003] One of the objectives of this invention is to provide an environmentally friendly purification method that addresses the shortcomings of existing technologies and significantly improves the efficiency of flue gas denitrification and purification.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: An environmentally friendly purification treatment method includes the following steps: Step 1: Select the material-liquid ratio according to the operating mode, prepare a fixed amount and concentration of urea solution by controlling the material-liquid ratio, and then transport the urea solution to the dosing equipment with a constant temperature preservation mode. Step 2: Use a PLC system to achieve automated control. First, control the flow rate and velocity of the flue gas entering the purification equipment. Then, control the urea solution to enter the purification equipment from the dosing device and absorb nitrogen oxides in the flue gas in a high-temperature environment of 850°C~1100°C. Control the injection speed of the urea solution jet to 0.5m / s~2.5m / s and monitor the concentration of nitrogen oxides in the environment in real time until the concentration of nitrogen oxides in the environment reaches the preset value.
[0005] Furthermore, step two also includes visual early warning, controlling the purification equipment to enter self-monitoring mode, and transmitting the monitored data to the visual equipment for information filtering and early warning judgment.
[0006] Furthermore, step two also includes further decomposing and purifying the flue gas, and controlling the purification equipment to activate the integrated collaborative decomposition and purification mode.
[0007] Furthermore, step two also includes intelligent analysis, intelligent prediction, and intelligent processing of the purification results.
[0008] The second objective of this invention is to provide an environmentally friendly purification system, comprising a purification device, a liquid transfer module, a gas transfer module, and a dispensing device. The purification device is equipped with a high-temperature reaction chamber and a liquid spraying assembly and a gas concentration detector respectively disposed corresponding to the high-temperature reaction chamber. The inlet of the purification device is connected to the gas transfer module, and the dispensing device is connected to the liquid spraying assembly through the liquid transfer module.
[0009] Furthermore, the liquid transfer module is equipped with a hydraulic detector, and the gas transfer module is equipped with a flow control valve.
[0010] Furthermore, the dispensing device is equipped with a constant temperature liquid storage section and a liquid level detection device installed in the constant temperature liquid storage section.
[0011] Furthermore, it also includes an early warning module, to which the gas concentration detector is connected via a control module.
[0012] Furthermore, it also includes a solution preparation device, which is connected to the dispensing device via a transfer pump.
[0013] Furthermore, both the liquid spraying assembly and the gas concentration detector are connected to the control module.
[0014] The beneficial effects of this invention are as follows: 1) This invention stably selects an appropriate concentration of urea solution as a reducing agent, and enables the urea solution added to the purification equipment to efficiently absorb and convert nitrogen oxides in the flue gas into pollution-free nitrogen gas. Within the purification equipment, the flue gas can be environmentally decomposed and purified, and the required denitrification purification of the flue gas is precisely achieved through controllable operation. 2) This invention can adjust the amount of urea solution added and the flue gas intake based on the gas concentration detection results, and can produce urea solutions of different concentrations to flexibly cope with different flue gas concentrations, thereby significantly improving the efficiency of flue gas denitrification purification. Attached Figure Description
[0015] Figure 1 This is a system structure diagram of the present invention.
[0016] Figure 2 This is a schematic diagram showing the connection of the liquid spraying assembly, gas concentration detector, early warning module, and control module of the present invention.
[0017] Figure 3 This is a schematic diagram of the dispensing device and liquid preparation device of the present invention.
[0018] Figure 4 This is a purification process diagram of the present invention.
[0019] The components include: 1. Purification equipment; 2. Liquid transfer module; 21. Hydraulic detector; 3. Gas transfer module; 31. Flow control valve; 4. Dispensing equipment; 41. Constant temperature liquid storage unit; 42. Liquid level detection component; 5. Spraying assembly; 6. Gas concentration detector; 7. Early warning module; 8. Control module; 9. Liquid dispensing equipment; 91. Transfer pump. Detailed Implementation
[0020] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following description is provided in conjunction with the appendix. Figures 1-4 The following is a detailed description of the specific implementation methods, structures, features, and effects of the present invention, as well as preferred embodiments.
[0021] An environmentally friendly purification and treatment system, such as Figures 1-3 As shown, it includes a purification device 1, a liquid transfer module 2, a gas transfer module 3, and a dispensing device 4. The purification device 1 is equipped with a high-temperature reaction chamber and a liquid spraying assembly 5 and a gas concentration detector 6, which are respectively installed in the high-temperature reaction chamber. The inlet of the purification device 1 is connected to the gas transfer module 3, and the dispensing device 4 is connected to the liquid spraying assembly 5 through the liquid transfer module 2.
[0022] The purification system also includes a solution preparation device 9, which has a urea dissolving tank. The top of the dissolving tank is connected to a demineralized water pipe. Opening the electric valve on the demineralized water pipe allows demineralized water to be injected into the urea dissolving tank until the set value of the magnetic level gauge in the tank is reached, at which point the valve is closed. A stirrer is installed on the upper side of the urea dissolving tank to heat the demineralized water inside and control its temperature to 38°C~40°C. Then, an electric hoist lifts the bagged urea granules to the dissolving tank platform, unpacks them, and adds them in batches according to the specified weight. After all urea has been added, stirring continues for at least one hour.
[0023] In order to ensure that the prepared urea solution is properly stored, the dispensing device 4 is equipped with a constant temperature storage section 41 and a liquid level detection element 42 installed in the constant temperature storage section 41. After the urea solution is prepared, the transfer pump 91 is started. The dispensing device 9 is connected to the dispensing device 4 through the transfer pump 91, so that the urea solution is stored in the constant temperature storage section 41 of the dispensing device 4.
[0024] In the dispensing device 4, the PLC system can be linked to the electric heater of the storage tank. When the temperature inside the tank is below 10°C and the liquid level is above 0.5m, the electric heater will start automatically; when the temperature rises to 40°C, the electric heater will stop automatically to ensure the stability of the solution.
[0025] Subsequently, the urea solution delivery pump located in the liquid transfer module 2 is started in the system. The reflux regulating valve connected to the constant temperature liquid storage section 41 is opened, and the pump outlet pressure is set. Through the interlocking control of the reflux regulating valve and the outlet pressure, the pressure is kept stable before precise injection of denitrification solution. This effectively regulates the amount of liquid delivered from the liquid transfer module 2 to the spraying component 5 by the dispensing device 4. The urea electric regulating valve located in the liquid transfer module 2 receives online NO. x By monitoring the data, the amount of solution added can be dynamically adjusted in real time.
[0026] Furthermore, a compressed air pipeline can be connected to one side of the spraying assembly 5 to adjust the spraying flow rate. The purification equipment 1 has a rotary kiln body, which allows the spraying assembly 5 and the compressed air pipeline to be installed in a compatible manner. This ensures that the urea solution and compressed air are not disturbed by the rotation of the kiln body. When the spraying assembly 5 consists of multiple denitrification spray guns arranged side by side, the urea solution can be stably delivered to the denitrification spray guns and sprayed into the kiln to complete the denitrification process.
[0027] Preferably, the liquid transfer module 2 is equipped with a hydraulic detector 21, and the gas transfer module 3 is equipped with a flow control valve 31, so as to know and control the liquid flow and gas flow conditions, thereby improving the safety of system operation.
[0028] Preferably, the system further includes an early warning module 7, and the gas concentration detector 6 is connected to the early warning module 7 through the control module 8. The early warning module 7 is an audible and visual alarm component, which can convert gas concentration information into the required data information or alarm signal.
[0029] Preferably, both the liquid spraying assembly 5 and the gas concentration detector 6 are connected to the control module 8, which can be a PLC controller or a PLC system.
[0030] An environmentally friendly purification method was also designed for the operation of the treatment system, including the following steps: Step 1: Select the material-liquid ratio according to the operating mode, prepare a fixed amount and concentration of urea solution by controlling the material-liquid ratio, and then transport the urea solution to the dosing device 4 with constant temperature preservation mode. Step 2: Use a PLC system to achieve automated control. First, control the flow rate and velocity of the flue gas entering the purification equipment 1. Then, control the urea solution to enter the purification equipment 1 from the dosing device 4 in a high-temperature environment of 850°C~1100°C to absorb nitrogen oxides in the flue gas. Control the injection speed of the urea solution jet to 0.5m / s~2.5m / s and monitor the concentration of nitrogen oxides in the environment in real time until the concentration of nitrogen oxides in the environment reaches the preset value.
[0031] Among them, the high-temperature environment of 850°C~1100°C in the purification equipment 1 is the flue gas denitrification environment in the rotary kiln, which is the high-temperature reaction chamber of the rotary kiln.
[0032] In step one, the concentration of the urea solution is determined based on the concentration of the flue gas. Different flue gas concentrations correspond to different operating modes. The urea dissolving tank has a proportioning control and monitoring module. The proportioning control and monitoring module adjusts the material-liquid ratio according to different flue gas concentrations. When preparing the urea solution, the first monitoring recorder in the proportioning control and monitoring module monitors the flow rate of urea particles in real time through the discharge valve to obtain the weight of urea particles added to the demineralized water. The second monitoring recorder in the proportioning control and monitoring module monitors the water volume in the urea dissolving tank through the level gauge. Both the weight of the urea particles and the water volume can be adjusted, thereby preparing urea solutions of different concentrations that can flexibly cope with different flue gas concentrations.
[0033] In step two, the jet velocity of the urea solution can be 1.5 m / s, 1.8 m / s, or 2.3 m / s.
[0034] Preferably, step two also includes a visual early warning system, controlling the purification equipment 1 to enter a self-monitoring mode, and transmitting the monitored data to a visual device for information filtering and early warning judgment. Specifically, the gas concentration detector 6 of the purification equipment 1 can detect the concentration of nitrogen oxides in the rotary kiln in real time. The security module of the purification equipment 1 has a self-monitoring program implemented in C#, which transmits the nitrogen oxide concentration data to the security module capable of running the program. The security module analyzes the efficiency of flue gas denitrification and purification in real time. Based on the visual monitoring of the security module, the purification equipment 1 can provide online NO... x Monitoring data. Furthermore, the visualization statistical tablet can be connected to the purification equipment 1. As a visualization device, the visualization statistical tablet can directly operate and retrieve the spraying status and flue gas absorption status during operation, and select information from different time periods for monitoring. The gas concentration detector 6 is connected to the early warning module 7 through the control module 8. The early warning module 7 can provide visual early warning on its own, or it can transmit data to the visualization statistical tablet for visual early warning.
[0035] Preferably, step two further includes further decomposing and purifying the flue gas by controlling the purification equipment 1 to activate the integrated co-decomposition and purification mode. In the purification equipment 1, the flue gas that has not been completely decomposed and purified can be transported to the co-decomposition and purification machine through the air extraction module set in the rotary kiln. The co-decomposition and purification machine is equipped with both a high-temperature decomposition furnace at 800°C~850°C and an electron beam irradiation component. The high-temperature decomposition furnace and the electron beam irradiation component decompose nitrogen and ammonia in an integrated manner, assisting in the environmentally friendly purification and decomposition of the flue gas.
[0036] Preferably, step two also includes intelligent analysis, intelligent prediction, and intelligent processing of the purification results. Based on the mass fraction of urea in the urea solution and the inlet flow rate of the flue gas, the intelligent analysis component calculates and analyzes the data from the first monitoring recorder, the second monitoring recorder, and the flow control valve 31, simulates, predicts, and judges the absorption effect of the urea solution on nitrogen oxides, thereby obtaining the purification effect of the flue gas more quickly and accurately.
[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. An environmentally friendly purification treatment method, characterized in that, Includes the following steps: Step 1: Select the material-liquid ratio according to the operating mode, prepare a fixed amount and concentration of urea solution by controlling the material-liquid ratio, and then transport the urea solution to the dosing equipment with a constant temperature preservation mode. Step 2: Use a PLC system to achieve automated control. First, control the flow rate and velocity of the flue gas entering the purification equipment. Then, control the urea solution to enter the purification equipment from the dosing device and absorb nitrogen oxides in the flue gas in a high-temperature environment of 850°C~1100°C. Control the injection speed of the urea solution jet to 0.5m / s~2.5m / s and monitor the concentration of nitrogen oxides in the environment in real time until the concentration of nitrogen oxides in the environment reaches the preset value.
2. The environmental purification treatment method as described in claim 1, characterized in that: Step two also includes visual early warning, controlling the purification equipment to enter self-monitoring mode, and transmitting the monitored data to the visual equipment for information filtering and early warning judgment.
3. The environmentally friendly purification treatment method as described in claim 1 or 2, characterized in that: Step two also includes further decomposing and purifying the flue gas, and controlling the purification equipment to start the integrated collaborative decomposition and purification mode.
4. The environmentally friendly purification treatment method as described in claim 1 or 2, characterized in that: Step two also includes intelligent analysis, intelligent prediction, and intelligent processing of the purification results.
5. An environmentally friendly purification system, characterized in that: The device includes a purification device (1), a liquid transfer module (2), a gas transfer module (3), and a dispensing device (4). The purification device (1) is equipped with a high-temperature reaction chamber and a liquid spraying assembly (5) and a gas concentration detector (6) respectively corresponding to the high-temperature reaction chamber. The inlet of the purification device (1) is connected to the gas transfer module (2), and the dispensing device (4) is connected to the liquid spraying assembly (5) through the liquid transfer module (2).
6. The environmental purification system as described in claim 5, characterized in that: The liquid transfer module (2) is equipped with a hydraulic detector (21), and the gas transfer module (3) is equipped with a flow control valve (31).
7. The environmental purification system as described in claim 5, characterized in that: The dispensing device (4) is equipped with a constant temperature liquid storage section (41) and a liquid level detection device (42) installed in the constant temperature liquid storage section (41).
8. The environmental purification system as described in claim 5, characterized in that: It also includes an early warning module (7), and the gas concentration detector (6) is connected to the early warning module (7) through a control module (8).
9. The environmental purification system as described in claim 5, characterized in that: It also includes a liquid preparation device (9), which is connected to the dispensing device (4) via a transfer pump (91).
10. The environmental purification system as described in claim 5, characterized in that: The liquid spraying assembly (5) and the gas concentration detector (6) are both connected to the control module (8).