Device for absorbing and treating nitrogen oxides through high-temperature plasma discharge and alkali spraying

Abstract

The invention provides a device for treating nitrogen oxides through high-temperature plasma discharge and alkali spraying absorption, which comprises a high-temperature plasma discharge device and an alkali spraying absorption device, and is characterized in that the high-temperature plasma discharge device is used for converting NOx in waste gas into absorbable intermediate products; and the alkali spraying and absorbing device is used for absorbing the converted NOx through alkali spraying. By means of the synergistic effect of high-temperature plasma discharge and alkali spraying absorption, efficient removal of NOx in waste gas is achieved. Through an optimized high-temperature plasma discharge technology and an improved alkali spraying absorption process, the removal efficiency of NOx is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a device for treating nitrogen oxides by high-temperature plasma discharge and alkali spraying absorption. Background Art

[0002] In modern industrial production processes, nitrogen oxides (NOx) in exhaust gas are one of the main air pollutants, and NOx emissions have serious impacts on the atmospheric environment and human health. Existing denitrification technologies mainly include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and other technologies, but these technologies have problems such as high energy consumption, complex equipment, serious secondary pollution and difficult maintenance. Therefore, it is of great significance to develop a NOx control technology that is both efficient and environmentally friendly.

[0003] At present, plasma technology, as a new type of waste gas treatment method, is widely used in various gas treatment fields due to its efficient chemical reaction ability. However, there are still some problems in the application of existing plasma technology in NOx treatment, especially how to effectively improve the reaction efficiency of plasma and NOx, reduce the energy consumption of equipment and reduce secondary pollution.

[0004] In order to solve the above problems, the present invention proposes a waste gas treatment device integrating high-temperature plasma discharge and alkaline spray absorption, which can achieve efficient NOx removal and has the characteristics of low energy consumption and zero secondary pollution. Summary of the invention

[0005] The purpose of the present invention is to provide a device for treating nitrogen oxides by high-temperature plasma discharge and alkaline spray absorption, which is used for treating nitrogen oxides (NOx) in industrial waste gas, and is particularly suitable for denitrification treatment of high-temperature waste gas. Through the synergistic effect of high-temperature plasma discharge and alkaline spray absorption, efficient removal of NOx in waste gas is achieved.

[0006] According to one object of the present invention, the present invention provides a device for treating nitrogen oxides by high-temperature plasma discharge and alkali spray absorption, comprising a high-temperature plasma discharge device and an alkali spray absorption device, wherein:

[0007] The high temperature plasma discharge device is used to convert NOx in the exhaust gas into absorbable intermediate products;

[0008] The alkali spray absorption device is used for absorbing the converted NOx through alkali spraying.

[0009] Furthermore, the high temperature plasma discharge device comprises:

[0010] High-temperature plasma electrodes are made of corrosion-resistant and high-temperature resistant molybdenum alloy materials, and the electrode surface has tiny grooves and channel structures to enhance the plasma discharge effect;

[0011] High-frequency and high-voltage power supply, with an operating frequency of 10kHz and an output voltage of 100kV, adopts intelligent frequency conversion technology to adjust the discharge intensity according to the exhaust gas flow and composition.

[0012] Furthermore, the discharge zone of the high-temperature plasma discharge device adopts a multi-stage ionization slot structure, and the airflow guiding system has an adjustable function, so that the residence time of the exhaust gas in the arc zone is effectively increased, thereby improving the NOx conversion rate.

[0013] Furthermore, the high-temperature plasma discharge device also includes an airflow control system, which includes a flow regulating valve and an airflow guide for optimizing the flow path of the exhaust gas to ensure that the plasma reaction is fully carried out, and the airflow path is accurately adjusted by a flow direction regulator.

[0014] Furthermore, the high-temperature plasma discharge device also includes a cooling system, which adopts a combination of internal circulation water cooling and external air cooling. The internal circulation water cooling is specifically used to provide cooling for the electrodes and the discharge area, while the external air cooling system is used to reduce the temperature of the overall structure to ensure stable operation of the device.

[0015] Furthermore, the alkali spray absorption device comprises:

[0016] The main body of the spray tower adopts a double-layer structure design that is resistant to high temperature and corrosion. The outer layer is a heat insulation layer, the inner layer is an anti-corrosion layer, and a honeycomb filler is provided inside to increase the contact surface area between the gas and the alkali solution.

[0017] The micro-atomizing nozzle can atomize the alkali solution into fine droplets to improve the NOx absorption efficiency.

[0018] Furthermore, the spray tower is equipped with a liquid level monitoring and feedback system. The intelligent liquid level sensor monitors the change of the alkali solution level in real time and automatically replenishes the alkali solution when the liquid level is too low, thereby ensuring the continuous and stable absorption effect.

[0019] Furthermore, the alkali solution circulation system adopts filtering and ion exchange technology to regenerate the alkali solution, recover the alkaline components, reduce the operation cost, and reduce the waste of resources.

[0020] Furthermore, it also includes an intelligent control system, which includes:

[0021] Sensors for real-time monitoring of exhaust gas and the working status of the absorption system;

[0022] The data acquisition and analysis system collects data from various sensors and optimizes equipment operating parameters to automatically adjust power output and nozzle spraying volume;

[0023] Remote monitoring and control function, realize remote management and monitoring of equipment through Internet of Things technology.

[0024] Furthermore, it also includes an automatic fire extinguishing system, high temperature alarm, gas leakage monitoring, overload protection and intelligent fault diagnosis system to ensure the safety and stability of the equipment during operation.

[0025] The technical solution of the present invention realizes the efficient removal of NOx in the exhaust gas through the synergistic effect of high-temperature plasma discharge and alkali spray absorption. The removal efficiency of NOx is effectively improved through the optimized high-temperature plasma discharge technology and the improved alkali spray absorption process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a high temperature plasma discharge device according to an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of an embodiment of the present invention;

[0029] Figure 3 is another structural schematic diagram of an embodiment of the present invention; DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] like Figure 1-Figure 3 As shown,

[0035] A device for treating nitrogen oxides by high-temperature plasma discharge and alkali spray absorption includes a high-temperature plasma discharge device and an alkali spray absorption device, wherein: the high-temperature plasma discharge device is used to convert NOx in the exhaust gas into absorbable intermediate products; the alkali spray absorption device is used to absorb the converted NOx through alkali spray. Specifically:

[0036] The high temperature plasma discharge device includes a high temperature plasma electrode, a high frequency and high voltage power supply, a discharge zone, a gas flow control system and a cooling system. Specifically:

[0037] The high-temperature plasma electrode is made of corrosion-resistant and high-temperature resistant molybdenum alloy material, and can work stably for a long time at high temperatures. The electrode uses self-cleaning technology to prevent carbide and oxide deposition, thereby ensuring long-term stable operation of the electrode. Each electrode surface is designed with tiny grooves and channel structures to guide gas flow through airflow and enhance the plasma discharge effect.

[0038] The high-frequency high-voltage power supply provides the electrical energy required for plasma discharge; the high-frequency high-voltage power supply has an operating frequency of 10kHz and an output voltage of 100kV. It uses intelligent frequency conversion technology to adjust the discharge intensity according to the exhaust gas flow and composition, and can be dynamically adjusted according to the exhaust gas composition and flow to ensure the optimization of plasma generation efficiency and energy consumption. The resonant circuit structure and high-efficiency filter are introduced to reduce high-frequency noise and energy loss in the power supply.

[0039] The discharge zone adopts a multi-stage ionization slot structure to ensure that the airflow stays in the ionization zone for a sufficient time and improves the NOx conversion rate. The discharge zone adopts a progressive structure design with an adjustable airflow guidance system, which allows the exhaust gas to stay in the arc zone for a longer time and improve the ionization rate.

[0040] like Figure 1 As shown, a high-frequency high-voltage power supply is applied between the high-voltage terminal electrode and the low-voltage terminal electrode, and a high-temperature plasma arc is generated in the arc generation area (discharge gap). The gas enters the high-temperature plasma discharge ionization device at a high speed from the gas inlet, forming a high-temperature plasma arc that impacts the gas barrier plate, forming a fan-shaped discharge covering the gas outlet of the high-temperature plasma discharge ionization device. Multiple high-temperature plasma discharge ionization devices are combined into a high-temperature plasma ionization device capable of treating various gases, including VOCs organic waste gas.

[0041] The gas flow control system is used to adjust the flow path of the exhaust gas in the device. The gas flow control system includes a flow control valve and an air flow guide to optimize the exhaust gas flow path and ensure that the plasma reaction is fully carried out. In addition to the conventional flow control valve, the gas flow control system also adds a flow direction regulator, which can accurately adjust the air flow path according to the flow direction, flow rate and temperature of the exhaust gas to improve the processing efficiency.

[0042] The cooling system adopts a combination of internal circulation water cooling and external air cooling to ensure stable operation of the device. The cooling system adopts a dual cooling design: internal circulation water cooling system and external air cooling system. The internal circulation water cooling system is specially used to cool the electrode and discharge area, while the external air cooling system is used to reduce the temperature of the overall structure to ensure stable operation of the device.

[0043] Working principle:

[0044] After the exhaust gas enters the high-temperature plasma discharge device, it enters the discharge zone and generates plasma through arc discharge between electrodes. At this time, the nitrogen and oxygen in the gas react chemically under high temperature and high pressure to generate nitrogen oxides such as NO, NO2 and N2O5. In order to further improve the conversion rate of NOx, the present invention dynamically adjusts the power supply frequency and current intensity to make the plasma generation and the reaction of NOx in the exhaust gas more efficient.

[0045] The alkali spray absorption device includes a spray tower body, a micro-atomizing nozzle, a liquid level monitoring and feedback system, and an alkali liquid circulation system. Specifically:

[0046] The main body of the spray tower adopts a high temperature and corrosion resistant double-layer structure design, with the outer layer being a heat insulation layer and the inner layer being an anti-corrosion layer, which can prevent the tower body from being corroded by high temperature and acid and alkali solutions, ensuring that the long-term operation of the equipment is not affected. The interior is equipped with honeycomb fillers, which greatly increases the surface area of ​​contact between gas and alkali solution, increases the contact area between gas and liquid, and improves the NOx absorption efficiency.

[0047] The spray tower is equipped with a micro-atomizing nozzle, which can atomize the alkali solution into fine droplets, increase the surface area of ​​the droplets, and improve the absorption efficiency of NOx. The nozzle adopts an adjustable spraying angle design, which can automatically adjust the spraying range and injection speed according to the changes in exhaust gas flow and temperature to optimize the absorption efficiency.

[0048] The liquid level monitoring and feedback system monitors the alkali liquid level in real time, monitors the alkali liquid level in real time and automatically adjusts it to ensure the stable operation of the absorption system. The liquid level monitoring and feedback system is equipped with an intelligent liquid level sensor to monitor the liquid level changes of the alkali liquid in real time. When the liquid level is too low, it automatically adds new alkali liquid to the system to ensure the continuous and stable absorption effect.

[0049] The pH value of the alkali solution is detected in real time. When the pH value is low, the system will automatically adjust the alkali solution to maintain the best absorption performance.

[0050] The alkali liquid circulation system uses filtration and ion exchange technology to regenerate the alkali liquid and reduce operating costs. The alkali liquid circulation system introduces a high-efficiency liquid regeneration device, which processes the alkali liquid that has adsorbed NOx through the filtration system and ion exchange system to recover the alkaline components, reduce resource waste and reduce operating costs.

[0051] Working principle: After the waste gas is converted into NOx by the high-temperature plasma device, it enters the spray tower. In the spray tower, the airflow contacts the fine mist produced by the alkali liquid atomizing nozzle, and the NOx is adsorbed and converted into harmless substances through chemical reactions. The main reaction process includes:

[0052] NO2 reacts with alkaline solution: NO2+OH - →NO3 - +H2O

[0053] N2O5 reacts with alkaline solution: N2O5+2OH - →2NO3 - +H2O

[0054] The waste gas after the reaction is discharged through the top of the tower, and most of the NOx is absorbed by the alkali solution and converted into harmless substances, reducing secondary pollution.

[0055] like Figure 2 As shown, multiple high-temperature plasma ionization devices are connected in series step by step to convert the oxygen and nitric oxide (NO) in the gas into nitrogen dioxide (NO2) and nitrogen pentoxide (N2O5).

[0056] Afterwards, water and alkaline solution are used to absorb nitrogen dioxide (NO2) and nitrogen pentoxide (N2O5) in the gas to complete the nitrogen oxide removal process.

[0057] The entire reaction process is that the oxygen in the gas is completely consumed, and the nitric oxide is completely converted into nitrogen dioxide (NO2), nitrogen trioxide (N2O3), and nitrogen pentoxide (N2O5) that can be absorbed by the alkali solution to complete the removal process of nitrogen oxides.

[0058] like Figure 3 As shown, a high temperature plasma ionization device and an alkali spray device are combined, and multiple combinations work in series.

[0059] The high temperature plasma ionization equipment converts oxygen and nitrogen in the gas into nitric oxide (NO). Oxygen and nitric oxide (NO) are converted into nitrogen dioxide (NO2) and nitrogen pentoxide (N2O5), which are absorbed by the alkali solution of the alkali spraying device.

[0060] After multiple combined treatments, the NO in the gas is completely converted into NOx and absorbed by the alkali solution of the alkali spray device, thus achieving the purpose of removing nitrogen oxides.

[0061] The present invention adopts an intelligent control system to control the operation of the entire device, specifically:

[0062] The intelligent control system consists of the following parts:

[0063] Sensors: Set up multiple sensors such as temperature, airflow, liquid level, pH value, etc. to monitor the working status of exhaust gas and absorption system in real time. Install multiple sensors at key locations of the entire equipment (such as high-temperature ionization area, spray tower, airflow pipeline, etc.) to monitor parameters such as temperature, pressure, airflow velocity, liquid level, pH value, etc. in real time. Through the collection and processing of sensor data, real-time feedback and adjustment of equipment status can be achieved.

[0064] Data acquisition and analysis system: collects data from various sensors, optimizes equipment operating parameters through algorithms, automatically adjusts power output, nozzle spraying volume, etc., to ensure efficient operation of the equipment. Introduces machine learning algorithms, automatically adjusts power input, gas flow, alkali spraying volume and other parameters by analyzing historical operating data to achieve the best exhaust gas treatment effect. The system can automatically optimize the operating mode according to changes in exhaust gas concentration and different environments to reduce energy consumption and improve treatment efficiency.

[0065] Remote monitoring and control: Through the Internet and Internet of Things technology, remote monitoring and operation of equipment can be realized, which is convenient for managers to understand the status of equipment in a timely manner. The equipment is equipped with remote monitoring function, and users can remotely manage the equipment through PC or mobile terminal. The monitoring system supports data visualization, and users can view the operating status of the equipment in real time and understand various performance indicators.

[0066] Safety protection system: This device is equipped with an automatic fire extinguishing system, and adopts multiple safety protection measures such as high temperature alarm, gas leakage monitoring, overload protection, etc. to ensure the safety of the equipment during operation. Intelligent fault diagnosis system: The system can warn of potential equipment failures in advance through fault self-diagnosis and alarm functions to ensure stable operation of the equipment. All diagnostic results are reported through the touch screen and remote terminal, which is convenient for maintenance personnel to handle in time.

[0067] The equipment is equipped with a protective cover to prevent operators from contacting high voltage power supply and high temperature parts during maintenance. Automatic fire extinguishing system: In the event of a fire, the system can respond quickly and automatically start the fire extinguishing device to prevent the fire from spreading.

[0068] The present invention provides a highly efficient, energy-saving, zero-secondary-pollution NOx treatment device, which realizes the efficient removal of NOx in the exhaust gas through the synergistic effect of high-temperature plasma discharge and alkaline spray absorption. The NOx removal efficiency is effectively improved by optimized high-temperature plasma discharge technology and improved alkaline spray absorption process. The high-frequency high-voltage power supply and intelligent adjustment technology are used to automatically adjust the ionization intensity according to the composition and flow rate of the exhaust gas to reduce energy consumption. The generation of secondary pollution is avoided through a perfect absorption system. Advanced intelligent sensors and control systems are introduced to monitor the equipment operation status in real time and optimize the equipment working parameters.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for high temperature plasma discharge and alkali spray absorption and treatment of nitrogen oxides, characterized in that: It includes a high-temperature plasma discharge device and an alkali spray absorption device, wherein: The high temperature plasma discharge device is used to convert NOx in the exhaust gas into absorbable intermediate products; The alkali spray absorption device is used for absorbing the converted NOx through alkali spraying.

2. The device for high temperature plasma discharge and alkaline spray absorption and treatment of nitrogen oxides according to claim 1 is characterized in that: The high temperature plasma discharge device comprises: High-temperature plasma electrodes are made of corrosion-resistant and high-temperature resistant molybdenum alloy materials, and the electrode surface has tiny grooves and channel structures to enhance the plasma discharge effect; High-frequency and high-voltage power supply, with an operating frequency of 10kHz and an output voltage of 100kV, adopts intelligent frequency conversion technology to adjust the discharge intensity according to the exhaust gas flow and composition.

3. The device for high temperature plasma discharge and alkali spraying absorption and treatment of nitrogen oxides according to claim 2 is characterized in that: The discharge zone of the high-temperature plasma discharge device adopts a multi-stage ionization slot structure, and the airflow guiding system has an adjustable function, so that the residence time of the exhaust gas in the arc zone is effectively increased, thereby improving the NOx conversion rate.

4. The device for high temperature plasma discharge and alkali spraying absorption and treatment of nitrogen oxides according to claim 3 is characterized in that: The high-temperature plasma discharge device also includes an airflow control system, which includes a flow regulating valve and an airflow guide, which are used to optimize the flow path of the exhaust gas to ensure that the plasma reaction is fully carried out, and the airflow path is accurately adjusted by a flow direction regulator.

5. The device for treating nitrogen oxides by high temperature plasma discharge and alkali spraying absorption according to claim 4 is characterized in that: The high-temperature plasma discharge device also includes a cooling system, which adopts a combination of internal circulation water cooling and external air cooling. The internal circulation water cooling is specifically used to cool the electrodes and the discharge area, while the external air cooling system is used to reduce the temperature of the overall structure to ensure stable operation of the device.

6. The device for high temperature plasma discharge and alkali spraying absorption and treatment of nitrogen oxides according to claim 1 is characterized in that: The alkali spray absorption device comprises: The main body of the spray tower adopts a double-layer structure design that is resistant to high temperature and corrosion. The outer layer is a heat insulation layer, the inner layer is an anti-corrosion layer, and a honeycomb filler is provided inside to increase the contact surface area between the gas and the alkali solution. The micro-atomizing nozzle can atomize the alkali solution into fine droplets to improve the NOx absorption efficiency.

7. The device for treating nitrogen oxides by high temperature plasma discharge and alkali spraying absorption according to claim 6 is characterized in that: The spray tower is equipped with a liquid level monitoring and feedback system. The intelligent liquid level sensor monitors the changes in the alkali solution level in real time and automatically replenishes the alkali solution when the liquid level is too low to ensure the continuous and stable absorption effect.

8. The device for treating nitrogen oxides by high temperature plasma discharge and alkali spraying absorption according to claim 7 is characterized in that: The spray tower is equipped with an alkali solution circulation system, which uses filtering and ion exchange technology to regenerate the alkali solution, recover the alkaline components, reduce operating costs, and reduce resource waste.

9. The device for treating nitrogen oxides by high temperature plasma discharge and alkali spraying absorption according to claim 8 is characterized in that: It also includes an intelligent control system, which includes: Sensors for real-time monitoring of exhaust gas and the working status of the absorption system; The data acquisition and analysis system collects data from various sensors and optimizes equipment operating parameters to automatically adjust power output and nozzle spraying volume; Remote monitoring and control function, realize remote management and monitoring of equipment through Internet of Things technology.

10. The device for treating nitrogen oxides by high temperature plasma discharge and alkali spraying absorption according to claim 9 is characterized in that: It also includes an automatic fire extinguishing system, high temperature alarm, gas leak monitoring, overload protection and intelligent fault diagnosis system to ensure the safety and stability of the equipment during operation.

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