CN116789230A - An atmospheric pressure rotating sliding arc plasma sewage treatment device - Google Patents

Abstract

The invention provides an atmospheric pressure rotary sliding arc plasma sewage treatment device, which relates to the technical field of sewage treatment devices and comprises: the sewage atomizer can atomize sewage and convey atomized particles to between the grounding electrode and the high-voltage electrode, and the air flow generating device can generate air flow flowing downwards from top to bottom in the purifying cavity to form a sliding arc, and the bottom of the purifying cavity is provided with a liquid outlet. The proposal provided by the invention can lead the plasma generation area to be larger, the concentration of active particles to be high, the energy utilization rate to be high and the cost to be low.

Description

An atmospheric pressure rotating sliding arc plasma sewage treatment device

Technical field

The present invention relates to the technical field of sewage treatment devices, and in particular to an atmospheric pressure rotating sliding arc plasma sewage treatment device.

Background technique

In order to protect the human living environment and reduce the threat of sewage to the ecological environment and human health, research on the prevention and degradation of water pollution has attracted widespread attention.

In recent years, plasma technology, as a new application technology, has been proven to be an effective method for degrading organic pollutants in water. Compared with other sewage treatment technologies, plasma technology has the characteristics of producing high-energy electrons and strong oxidizing free radicals, which can excite, ionize or break bonds of difficult-to-degrade organic molecules, accelerate the degradation of pollutants, and has the characteristics of no secondary pollution, It has the advantages of many types of ions that can be used, many discharge modes, and flexible processes. Therefore, it has certain research potential in the field of wastewater degradation.

As a discharge method in plasma discharge, sliding arc plasma has the characteristics of both thermal equilibrium plasma and non-equilibrium plasma. Since the main energy consumption in the sliding arc plasma discharge process is in the non-equilibrium region, the overall low-temperature plasma still exhibits significant characteristics, which can provide more energy, generate more high-energy electrons and more types of active particles, and can Degrading small molecule pollutants can also degrade large molecule pollutants. Common forms of sliding arc discharge devices include traditional knife-shaped sliding arc reactors, conical internal electrode sliding arc reactors, and three-dimensional dragon whirlwind sliding arc reactors. For sewage treatment, there are two main treatment methods that combine sliding arc and water: one is to place the sliding arc plasma device above the sewage, and the plasma plume contacts the sewage to achieve the purpose of degradation; the other is to It passes the sewage and the reaction gas into the reactor through an atomizing nozzle, generating a gas-liquid two-phase discharge, thereby degrading the pollutants in the sewage. Based on the above advantages, sliding arc plasma has been extensively studied by scholars from various countries in the degradation of sewage. In the 1990s, French scholar Czernichowski A and others first proposed the application of sliding arc discharge plasma (French patent 2639172) to treat toluene, xylene, and heptane in industrial waste gas. Du Changming and others used sliding arc plasma to treat sewage and combined the atomizing nozzle with the knife-shaped sliding arc. According to the different reactor structures, they developed a single-phase AC sliding arc plasma device (Chinese patent 200410015948.0) and a three-phase AC sliding arc plasma device. The advantage of the AC sliding arc plasma device (Chinese patent 200710028667.2) is that it produces a variety of active particles under atmospheric pressure that directly act on the sewage. The disadvantage is that the sliding arc plasma generation area is a two-dimensional plane and the sewage residence time is short. Yan Jianhua and others provided a magnetically driven spiral sliding arc plasma sewage treatment device (Chinese patent 201010193995. It increases energy consumption. Wei High heat and low concentration of active free radicals.

Contents of the invention

The purpose of the present invention is to provide an atmospheric pressure rotating sliding arc plasma sewage treatment device to solve the problems existing in the above-mentioned prior art, so as to make the plasma generation area larger, the concentration of active particles high, the energy utilization rate high, and the cost low.

In order to achieve the above objects, the present invention provides the following solutions:

The invention provides an atmospheric pressure rotating sliding arc plasma sewage treatment device, which includes: a sewage atomizer, a purification chamber, a ground electrode, a high-voltage electrode and an airflow generating device. The ground electrode and the high-voltage electrode are both arranged in the purification chamber. In the cavity, the ground electrode is located above the high-voltage electrode, which is a spiral electrode extending from top to bottom. The sewage atomizer can atomize sewage and transport atomized particles to the ground Between the electrode and the high-voltage electrode, the airflow generating device can generate an airflow flowing from top to bottom in the purification chamber to form a sliding arc, and a liquid outlet is provided at the bottom of the purification chamber.

Preferably, it also includes a liquid storage tank, the liquid storage tank is used to hold sewage, the liquid outlet is connected to the liquid storage tank, the sewage atomizer is connected to the liquid storage tank, and the storage tank is connected to the liquid storage tank. The sewage in the liquid pool is lifted into the sewage atomizer through a peristaltic pump, and the sewage atomizer is an atomizing nozzle.

Preferably, the ground electrode is annular and arranged coaxially with the high voltage electrode.

Preferably, the air flow generating device includes a carrier gas source, and a plurality of air inlets extending tangentially are provided on the side wall of the bottom of the purification chamber. The carrier gas source is connected to the air inlets, and the air flow is After entering from the air inlet, it gradually moves upward along the outside of the spiral electrode. After the airflow reaches the top of the purification chamber, it will flow back downward to form a downward airflow and flow downward from the inside of the spiral electrode.

Preferably, the purification chamber is formed in a quartz glass tube, and the quartz glass tube is provided with open openings at both ends. The openings at both ends are sealed with an end cap, and the liquid outlet is provided on the lower end cap. Each of the end caps is connected through a plurality of screws.

Preferably, it also includes an oscilloscope and a high-voltage power supply, the high-voltage power supply is electrically connected to the high-voltage electrode, and the oscilloscope can monitor changes in voltage and current of the high-voltage power supply.

Preferably, a cooling pool is added outside the liquid storage tank.

Compared with the prior art, the present invention achieves the following technical effects:

The atmospheric pressure rotary sliding arc plasma sewage treatment device provided by the present invention has the following advantages: introducing a sewage atomizer to atomize the liquid into small droplets can reduce the breakdown voltage of discharge, which is more conducive to the formation of discharge arc. At the same time, Liquid atomization increases the specific surface area of sewage, which is more conducive to the interaction between plasma and liquid, and improves energy utilization efficiency; at the same time, the sliding arc based on the spiral electrode, compared with the traditional two-dimensional knife-shaped sliding arc, the discharge volume changes from 2D to 3D, increasing the gas residence time, and generating a top-down airflow in the purification chamber to form a sliding arc, increasing the length of the discharge arc, thereby increasing the volume of the plasma area formed by the discharge, and increasing the concentration of active particles ; The use of peristaltic pumps for sewage circulation improves the mass transfer effect between active particles and pollutants, improves treatment efficiency, and can further achieve large-area and large-scale treatment.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of the atmospheric pressure rotating sliding arc plasma sewage treatment device provided by the present invention;

Figure 2 is a schematic structural diagram of a reactor consisting of a ground electrode, a high voltage electrode, a quartz glass tube and an end cap;

Figure 3 is a top view of Figure 2;

Figure 4 is a cross-sectional view of Figure 3;

In the picture: 1-quartz glass tube; 2-ground electrode; 3-high voltage electrode; 4-atomizing nozzle; 5-peristaltic pump; 6-liquid storage tank; 7-cooling tank; 8-high voltage power supply; 9-carrier gas Source; 10-oscilloscope; 11-liquid inlet; 12-liquid outlet; 13-end cover; 14-screw; 15-air inlet; 16-purification chamber.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The purpose of the present invention is to provide an atmospheric pressure rotating sliding arc plasma sewage treatment device to solve the problems existing in the above-mentioned prior art, so as to make the plasma generation area larger, the concentration of active particles high, the energy utilization rate high, and the cost low.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The invention provides an atmospheric pressure rotating sliding arc plasma sewage treatment device, as shown in Figures 1 to 4, including: a sewage atomizer, a purification chamber 16, a ground electrode 2, a high-voltage electrode 3 and an air flow generating device. The ground electrode 2 The ground electrode 2 and the high-voltage electrode 3 are both arranged in the purification chamber 16. The ground electrode 2 is located above the high-voltage electrode 3. The high-voltage electrode 3 is a spiral electrode extending from top to bottom. The sewage atomizer can atomize the sewage and transport the atomized particles. Between the ground electrode 2 and the high-voltage electrode 3 , the airflow generating device can generate an airflow flowing from top to bottom in the purification chamber 16 to form a sliding arc. A liquid outlet 12 is provided at the bottom of the purification chamber 16 .

Among them, the ground electrode 2 is annular and is coaxially arranged with the high-voltage electrode 3; the ground electrode 2 is connected to the ground, and the high-voltage electrode 3 is connected to a high-voltage source; the distance between the distal end of the high-voltage electrode 3 and the upper ground electrode 2 is the narrowest distance between the two electrodes. When the high-voltage electrode 3 passes high voltage, it breaks down at the narrowest point of the two electrodes to form an arc.

The air flow generating device includes a carrier gas source 9. A number of air inlets 15 extending tangentially are provided on the side wall of the bottom of the purification chamber 16. The carrier gas source 9 is connected with the air inlets 15, and the air flow enters from the air inlets 15. The rear edge gradually moves upward along the outside of the spiral electrode (the annular space between the inner wall of the purification chamber 16 and the spiral electrode). After the airflow reaches the top of the purification chamber 16, it will flow back downward to form a downward airflow and flow downward from inside the spiral electrode. .

Specifically, the carrier gas source 9 enters the purification chamber 16 through three sets of tangential air inlets 15 at the bottom of the device to form a gas flow. Each group of air inlets contains two holes, which are connected by an annular air inlet pipe to introduce gas. , and a rotating vortex is formed at the bottom of the quartz glass tube 1, gradually upward along the outside of the spiral electrode. After the air flow reaches the top of the quartz glass tube 1, a downward air flow will be formed, downward from the center of the spiral electrode, through the liquid outlet 12 , is discharged from the exhaust port of the liquid storage tank 6. In the gas path system, a flow meter is provided to adjust the gas flow rate.

The purification chamber 16 is formed in the quartz glass tube 1. The quartz glass tube 1 has two open ends. The openings at both ends are sealed and provided with an end cap 13. The lower end cap is provided with a liquid outlet 12 and two end caps 13. Connected by multiple screws 14.

In some embodiments, the atmospheric pressure rotating sliding arc plasma sewage treatment device also includes a liquid storage tank 6. The liquid storage tank 6 is used to hold sewage. The liquid outlet 12 is connected to the liquid storage tank 6. The sewage atomizer is connected to the storage tank 6. The liquid pool 6 is connected, and the sewage in the liquid storage pool 6 is lifted into the sewage atomizer through the peristaltic pump 5. The sewage atomizer is an atomizing nozzle 4.

The sewage is placed in the liquid storage tank 6 below. The sewage is transferred from the liquid storage tank 6 to the atomization nozzle 4 above by adjusting the liquid flow rate through the peristaltic pump 5, and then passes through the plasma generation area and returns to the liquid storage from the liquid outlet 12 below. Pool 6 forms a water circulation loop.

In this embodiment, the circulation of sewage is set in a closed-loop form to fully purify it. In order to maintain the solution temperature at room temperature during the entire treatment process, a cooling pool 7 is installed outside the liquid storage tank 6 .

In some embodiments, the atmospheric pressure rotating sliding arc plasma sewage treatment device also includes an oscilloscope 10. The high-voltage power supply 8 is electrically connected to the high-voltage electrode 3. The oscilloscope 10 can monitor the voltage and current changes of the high-voltage power supply 8 and calculate the effective discharge power. By calculating the effective power and degradation efficiency to obtain the energy consumption of the power supply during the sewage treatment process.

The method of treating sewage through an atmospheric pressure rotating sliding arc plasma sewage treatment device is:

(1) Place the sewage in the liquid storage tank 6 below. The sewage is transferred from the liquid storage tank 6 to the atomizing nozzle 4 above through the peristaltic pump 5 to adjust the liquid flow rate, and then passes through the plasma generation area to the liquid outlet 12 below. Return to the liquid storage tank 6 to form a water circulation loop;

(2) The carrier gas source 9 enters the reactor through three sets of tangential air inlets 15 at the bottom of the device to form an air flow, and forms a rotating vortex at the bottom of the quartz glass tube 1, gradually upward along the outside of the spiral electrode, and the air flow reaches the quartz glass tube 1, a downward airflow will be formed, downward from the center of the spiral electrode, through the liquid outlet 12, and discharged from the exhaust port of the liquid reservoir 6. In the gas path system, a flow meter is provided to adjust the gas flow. size;

(3) When the water and gas systems are adjusted to stability, turn on the high-voltage power supply 8. The ring-shaped electrode is grounded, and the spiral electrode is connected to the high-voltage electrode 3. By applying high voltage between the two electrodes, the arc breaks down at the narrowest point above it, and is driven by the downward airflow formed by the incoming gas, so the arc Continuously rotate downward and lengthen along the spiral electrode until it is stretched to the bottom of the spiral electrode. Since the heat loss of the arc exceeds the energy supplied by the power supply, the arc is extinguished at this time, and a new arc will be formed at the narrowest part of the electrode. Starting the same process will produce a cycle process over and over again. Finally, the arc will continue to rotate between the two electrodes to form a stable plasma region. During this process, a large number of high-energy electrons and active particles such as hydrogen peroxide, ozone, hydroxyl radicals, and oxygen free radicals will be generated, which will undergo various physical and chemical reactions with the sewage, thereby degrading the sewage.

(4) The sewage enters the plasma area through the atomization nozzle 4 and reacts with active species such as high-energy electrons and strong oxidizing free radicals. The treated sewage flows out from the liquid outlet 12 and then flows into the liquid storage tank 6 to form a cycle. , thereby achieving the degradation of sewage. Multiple circulation of sewage is realized through the peristaltic pump 5, which increases the residence time of sewage in the plasma area and greatly improves the treatment efficiency.

(5) During operation, the voltage and current changes of the high-voltage power supply 8 are monitored through the oscilloscope 10, and the discharge effective power is calculated. By calculating the effective power and degradation efficiency, the energy consumption of the power supply during the sewage treatment process is obtained.

Specific examples are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, based on this The idea of the invention will be subject to change in the specific implementation and scope of application. In summary, the contents of this description should not be construed as limitations of the present invention.

Claims (7)

1. An atmospheric pressure rotating sliding arc plasma sewage treatment device, characterized in that it includes: a sewage atomizer, a purification chamber, a ground electrode, a high-voltage electrode and an air flow generating device, and the ground electrode and the high-voltage electrode are both arranged in In the purification chamber, the ground electrode is located above the high-voltage electrode, which is a spiral electrode extending from top to bottom. The sewage atomizer can atomize sewage and transport atomized particles to Between the ground electrode and the high-voltage electrode, the airflow generating device can generate an airflow flowing from top to bottom in the purification chamber to form a sliding arc, and a liquid outlet is provided at the bottom of the purification chamber. 2. The atmospheric pressure rotary sliding arc plasma sewage treatment device according to claim 1, characterized in that: it also includes a liquid storage tank, the liquid storage tank is used to hold sewage, the liquid outlet and the liquid storage The pool is connected, and the sewage atomizer is connected with the liquid storage tank. The sewage in the liquid storage tank is lifted into the sewage atomizer through a peristaltic pump. The sewage atomizer is an atomizing nozzle. 3. The atmospheric pressure rotating sliding arc plasma sewage treatment device according to claim 1, characterized in that the ground electrode is annular and is coaxially arranged with the high voltage electrode. 4. The atmospheric pressure rotary sliding arc plasma sewage treatment device according to claim 3, characterized in that: the air flow generating device includes a carrier gas source, and several tangential Extended air inlet, the carrier gas source is connected to the air inlet, the air flow enters from the air inlet and gradually moves upward along the outside of the spiral electrode. After the air flow reaches the top of the purification chamber, it will flow back downwards. And a downward airflow is formed and flows downward from inside the spiral electrode. 5. The atmospheric pressure rotary sliding arc plasma sewage treatment device according to claim 1, characterized in that: the purification chamber is formed in a quartz glass tube, and the quartz glass tube is provided with open openings at both ends. The sealing cover is provided with an end cover, the lower end cover is provided with the liquid outlet, and the two end covers are connected through a plurality of screws. 6. The atmospheric pressure rotating sliding arc plasma sewage treatment device according to claim 1, characterized in that: it also includes an oscilloscope and a high-voltage power supply, the high-voltage power supply is electrically connected to the high-voltage electrode, and the oscilloscope can monitor the high-voltage power supply. Voltage and current changes. 7. The atmospheric pressure rotating sliding arc plasma sewage treatment device according to claim 2, characterized in that: a cooling pool is installed outside the liquid storage tank.