A self-electroregenerative magnetic cyclonic separation plasma system for purifying coking tail gas

Abstract

The present invention provides a self-electrical regeneration type magnetic gyro separation plasma system for purifying coking tail waste gas, which relates to the field of waste gas purification and comprises a plasma separator and a waste gas reactor. The plasma separator comprises a plasma generator, a magnetic field generating device and a plasma movement channel, the plasma movement channel is covered by a magnetic field generated by the magnetic field generating device, the waste gas reactor is connected to the plasma separator through a connecting device, and the two ends of the waste gas reactor are respectively a waste gas inlet and a waste gas outlet; the self-electrical regeneration type magnetic gyro separation plasma system for purifying coking tail waste gas provided by the present invention separates high-energy electrons through an external magnetic field, thereby avoiding the annihilation of electrons during the purification process, improving the efficiency of purification treatment, and reducing energy consumption; secondly, positively charged particles separated by the external magnetic field move in a directional manner to generate current, which supplements the electric energy required for plasma excitation, namely "self-electrical regeneration", further reducing energy consumption.

Description

Technical Field

[0001] The invention belongs to the field of waste gas purification, and in particular relates to a self-electrical regeneration type magnetic rotation separation plasma purification system for coking tail waste gas. Background Art

[0002] Coke oven gas, also known as coke oven gas, is a high calorific value gas, raw gas or waste gas due to its high combustible components. However, during the purification process of coke oven gas, there will be low concentrations of VOCs tail gas spills in the condensation and blasting, desulfurization, ammonium sulfate, crude benzene and other sections, which will affect the atmospheric environment. Therefore, the waste gas purification problem of coke oven gas has received more and more attention.

[0003] VOCs control technology can be basically divided into two categories: the first category is preventive measures based on improving process technology, replacing equipment, using substitutes and preventing leakage; the second category is control measures based on end-of-pipe treatment. The second category of methods is divided into two major directions: one is the recovery method, which is mainly aimed at medium and high concentrations of VOCs emissions; the other is the treatment method, which is mainly aimed at low concentrations of VOCs emissions. At present, my country has increased its efforts in clean production and requires qualified enterprises to use the first category of VOCs control technology as much as possible. However, due to the relatively large investment in the first category of control technology and the heavy burden on enterprises, my country currently mainly uses the second category of technology in VOCs control, especially the end-of-pipe treatment method, including direct combustion, catalytic oxidation, absorption, adsorption and condensation.

[0004] Low-temperature plasma technology has the advantages of high efficiency, low energy consumption, wide range of applications, large processing volume, and simple operation in treating low-concentration organic waste gas. It shows good development prospects and has attracted widespread attention.

[0005] Plasma is a gas that is ionized under high pressure and voltage conditions. It is composed of charged particles such as electrons and ions and neutral particles such as atoms and molecules. On a macroscopic scale, the system forms a quasi-neutral fluid. The number of positive and negative charges in plasma is the same, and it has conductivity and electromagnetic properties.

[0006] Plasma is divided into natural and artificial according to the different ways it is produced. Most of the stars, galaxies and nebulae in the universe are in a plasma state, and the aurora and afterglow on Earth are also a form of plasma; artificial plasma mostly appears in neon lights and fluorescent lights commonly seen in daily life, as well as plasma torches used in industrial welding and material preparation.

[0007] According to the thermodynamic equilibrium classification, the system temperature of a completely thermodynamically balanced plasma exceeds 5×10 3 K, and both the ion temperature and the electron temperature reach thermal equilibrium; the temperature of electrons in non-thermodynamic equilibrium plasmas can reach up to 10×10 3K, but the temperature of the ions is only 300~500K.

[0008] Industrial production and laboratories generally use gas discharge to generate low-temperature plasma, that is, a sufficiently high voltage is applied to two electrodes so that the gas between the electrodes is ionized to generate low-temperature plasma.

[0009] Traditional methods for treating low-concentration VOCs emissions generated during the purification of coke oven gas, such as absorption and adsorption, have problems such as large investment, low efficiency in treating low-concentration waste gas, and narrow application. To solve this problem, a self-electroregenerative magnetic cyclonic separation plasma purification coking tail gas system has been developed to treat VOCs tail gas. Summary of the invention

[0010] Plasma technology is used to purify VOCs tail gas, and high-energy electrons are the main agents. The plasma generated by gas discharge contains electrons and positively charged particles. When the existing technology treats tail gas, it is in a device. During the treatment process, electron annihilation is inevitable, that is, electrons and positively charged particles combine, which increases the treatment energy consumption and reduces the treatment efficiency.

[0011] The object of the present invention is to provide a self-electrical regeneration magnetic rotation separation plasma system for purifying coking tail gas, so as to solve the problems raised in the above-mentioned background technology.

[0012] In order to solve the above technical problems, the present invention provides a self-electric regeneration magnetic rotation separation plasma purification system for coking tail waste gas, including a plasma separator and a waste gas reactor;

[0013] The plasma separator comprises a plasma generator, a magnetic field generating device and a plasma movement channel;

[0014] The plasma generator is located at the upper part of the plasma separator, the plasma movement channel is located at the lower part of the plasma separator and connected to the plasma generator, and the plasma movement channel is covered by the magnetic field generated by the magnetic field generating device;

[0015] The exhaust gas reactor is connected to the plasma separator via a connecting device;

[0016] The two ends of the exhaust gas reactor are respectively an exhaust gas inlet and an exhaust gas outlet.

[0017] Furthermore, the discharge mode of the plasma generator is one of dielectric barrier discharge, glow discharge, corona discharge or radio frequency discharge.

[0018] Industrial production and laboratories generally use gas discharge to generate low-temperature plasma, that is, a sufficiently high voltage is applied to two electrodes so that the gas between the electrodes is ionized to generate low-temperature plasma.

[0019] The mechanism of plasma technology for purifying VOCs is that low-temperature plasma is generated by dielectric barrier discharge, glow discharge, corona discharge, radio frequency discharge, etc. The temperature of electrons in the system is as high as tens of thousands of degrees Celsius. When high-energy electrons collide with VOCs molecules, they will directly smash these volatile organic compound molecules to degrade them. Accompanied by reactions such as excitation, ionization, and dissociation, these VOCs macromolecules are converted into non-toxic and harmless molecules such as H2O and CO2, thereby achieving a purification effect. The energy of electrons in the electric field determines the selectivity of the volatile organic compound molecules. Only when the electron energy reaches a certain level will the electrons collide inelastically with the VOCs molecules and transfer most of the energy to the macromolecules.

[0020] Furthermore, the discharge mode of the plasma generator is a flat-plate dielectric barrier discharge, the dielectric material covers the positive terminal, and the negative terminal is grounded.

[0021] Reduce experimental risks by grounding the negative electrode.

[0022] Furthermore, the exhaust gas reactor is a bobbin-type reactor, and the material of the exhaust gas reactor is a quartz glass tube material.

[0023] Furthermore, both ends of the waste gas reactor are plugged with rubber plugs, a waste gas inlet is provided on the rubber plug at one end of the waste gas reactor, and a waste gas outlet is provided on the rubber plug at the other end of the waste gas reactor.

[0024] The two ends of the exhaust gas reactor are plugged with rubber plugs to ensure that the gas is fully reacted in the exhaust gas reactor and will not leak out. A waste gas inlet is opened on the rubber plug at one end of the exhaust gas reactor, and a waste gas outlet is opened on the rubber plug at the other end. The gas circulation is ensured by opening the waste gas inlet or the waste gas outlet on the rubber plug.

[0025] Furthermore, the structure of the plasma sorter is a rectangular parallelepiped, and the electron outlet and the positive particle outlet are respectively opened on the opposite sides of the plasma movement channel, and the electron inlet is opened on the side of the exhaust gas reactor. One end of the connecting device is connected to the electron outlet, and the other end is connected to the electron inlet.

[0026] Furthermore, the magnetic field generated by the magnetic field generating device is a uniform magnetic field.

[0027] Furthermore, the movement direction of the electrons and positively charged particles generated by the plasma generator is perpendicular to the direction of the magnetic induction intensity.

[0028] By controlling the plasma generator to control the charge, speed and direction of electrons and positively charged particles, and by controlling the strength and direction of the magnetic field generated by the magnetic field generating device, according to the knowledge related to the magnetic field, when the direction of movement of the electrons and positively charged particles generated by the plasma generator is perpendicular to the direction of the magnetic induction intensity, the electrons and positively charged particles will be affected by the Lorentz force, and the direction of the Lorentz force is always perpendicular to the direction of the speed. The charged particles will perform uniform circular motion in a uniform magnetic field, making it easier to control the emission direction of electrons and positively charged particles, sort the plasma generated by gas discharge, and sort out high-energy electrons, avoiding the annihilation of electrons in the purification process, which can improve the processing efficiency and reduce the processing energy consumption. The sorted positively charged particles move in a directed manner to generate current to supplement the electrical energy required for plasma excitation, which is the so-called "self-electric regeneration", and is also a manifestation of reducing energy consumption.

[0029] Beneficial effects:

[0030] (1) The self-electric regeneration magnetic gyro separation plasma purification system for coking tail gas provided by the present invention comprises a plasma separator and an exhaust gas reactor. The plasma separator comprises a plasma generator, a magnetic field generating device and a plasma motion channel. By applying an external magnetic field, high-energy electrons are separated, thereby avoiding the annihilation of electrons during the purification process, improving the efficiency of purification treatment and reducing energy consumption.

[0031] (2) The self-electrical regeneration magnetic rotation sorting plasma system for purifying coking tail gas provided by the present invention uses an external magnetic field to sort out positively charged particles, which move in a directional manner and generate electric current to supplement the electric energy required for plasma excitation, which is the so-called "self-electrical regeneration", further reducing energy consumption.

[0032] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas;

[0034] Figure 2 It is a schematic diagram of the BC section of a self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas;

[0035] Figure 3 It is a DC cross-sectional schematic diagram of a self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas;

[0036] Figure 4 Schematic diagram of the mechanism of VOCs purification using plasma technology.

[0037] The reference numerals are as follows: 1-plasma separator; 1-1-plasma generator; 1-2-plasma movement channel; 2-exhaust gas reactor. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0039] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0040] Example

[0041] like Figures 1 to 4 In a preferred embodiment, a self-electric regeneration magnetic cyclonic separation plasma purification system for coking tail gas is provided, comprising a plasma separator 1 and a waste gas reactor 2;

[0042] The plasma separator 1 comprises a plasma generator 1-1, a magnetic field generating device and a plasma movement channel 1-2;

[0043] The plasma generator 1-1 is located at the upper part of the plasma separator 1, the plasma movement channel 1-2 is located at the lower part of the plasma separator 1 and connected to the plasma generator 1-1, and the plasma movement channel 1-2 is covered by the magnetic field generated by the magnetic field generating device;

[0044] The exhaust gas reactor 2 is connected to the plasma separator 1 via a connecting device;

[0045] The two ends of the exhaust gas reactor 2 are respectively an exhaust gas inlet and an exhaust gas outlet.

[0046] The discharge mode of the plasma generator 1 - 1 is one of dielectric barrier discharge, glow discharge, corona discharge or radio frequency discharge.

[0047] Industrial production and laboratories generally use gas discharge to generate low-temperature plasma, that is, a sufficiently high voltage is applied to two electrodes so that the gas between the electrodes is ionized to generate low-temperature plasma.

[0048] The mechanism of plasma technology for purifying VOCs is that low-temperature plasma is generated by dielectric barrier discharge, glow discharge, corona discharge, radio frequency discharge, etc. The temperature of electrons in the system is as high as tens of thousands of degrees Celsius. When high-energy electrons collide with VOCs molecules, they will directly smash these volatile organic compound molecules to degrade them. Accompanied by reactions such as excitation, ionization, and dissociation, these VOCs macromolecules are converted into non-toxic and harmless molecules such as H2O and CO2, thereby achieving a purification effect. The energy of electrons in the electric field determines the selectivity of the volatile organic compound molecules. Only when the electron energy reaches a certain level will the electrons collide inelastically with the VOCs molecules and transfer most of the energy to the macromolecules.

[0049] In this embodiment, the discharge mode of the plasma generator 1 - 1 is a flat-plate dielectric barrier discharge, with the dielectric material covering the positive terminal and the negative terminal being grounded.

[0050] Reduce experimental risks by grounding the negative electrode.

[0051] The exhaust gas reactor 2 is a bobbin-type reactor, and the material of the exhaust gas reactor 2 is a quartz glass tube material.

[0052] Both ends of the exhaust gas reactor 2 are plugged with rubber plugs, and an exhaust gas inlet or an exhaust gas outlet is provided on the rubber plugs.

[0053] The exhaust gas reactor 2 has a cylindrical structure, and the upper and lower ends of the exhaust gas reactor 2 are plugged with rubber plugs to ensure that the gas is fully reacted in the exhaust gas reactor 2 and will not leak out. A waste gas inlet is opened on the rubber plug at one end of the exhaust gas reactor 2, and a waste gas outlet is opened on the rubber plug at the other end. The gas circulation is ensured by opening the waste gas inlet or the waste gas outlet on the rubber plug.

[0054] The structure of the plasma sorter 1 is a rectangular parallelepiped, and the electron outlet and the positive particle outlet are respectively opened on the opposite sides of the plasma movement channel 1-2. The electron inlet is opened on the side of the exhaust gas reactor 2. One end of the connecting device is connected to the electron outlet, and the other end is connected to the electron inlet.

[0055] like Figure 1 As shown, in order to better describe the direction of the magnetic field, the four vertices of the bottom surface of the plasma movement channel 1-2 are named a, b, c and d respectively. In this embodiment, when the direction of the magnetic field generated by the magnetic field generating device is from b to c, the electrons and positively charged particles generated by the plasma generator 1-1 enter the magnetic field vertically. Under the action of the Lorentz force, high-speed electrons are ejected from the left side of the plasma sorter 1 through the electron outlet, the connecting device and the electron inlet into the exhaust gas reactor 2, and the positively charged particles are ejected from the positively charged particle outlet on the right side of the plasma sorter 1.

[0056] The magnetic field generated by the magnetic field generating device is a uniform magnetic field.

[0057] The moving direction of the electrons and positively charged particles generated by the plasma generator 1 - 1 is perpendicular to the direction of the magnetic induction intensity.

[0058] By controlling the plasma generator to control the charge amount, movement speed and movement direction of electrons and positively charged particles, and by controlling the strength and direction of the magnetic field generated by the magnetic field generating device, according to the knowledge related to the magnetic field, when the movement direction of the electrons and positively charged particles generated by the plasma generator 1-1 is perpendicular to the direction of the magnetic induction intensity, the electrons and positively charged particles will be affected by the Lorentz force, and the direction of the Lorentz force is always perpendicular to the speed direction. The charged particles will perform uniform circular motion in the uniform magnetic field, which makes it easier to control the emission direction of electrons and positively charged particles, sort the plasma generated by gas discharge, and sort out high-energy electrons, avoiding the annihilation of electrons in the purification process, thereby improving the processing efficiency and reducing the processing energy consumption. The sorted positively charged particles move in a directed manner to generate current to supplement the electrical energy required for plasma excitation, which is the so-called "self-electric regeneration", and is also a manifestation of reducing energy consumption.

[0059] The working principle of the present invention is as follows: the plasma generator 1-1 on the upper part of the plasma sorter 1 is a flat dielectric barrier discharge structure, the dielectric material covers the positive electrode side, and the negative electrode is grounded. When a sufficiently high voltage is applied to the discharge electrode, the ionized gas in the plasma generator 1-1 is ionized to form a filamentary plasma, and then the plasma vertically enters the plasma movement channel 1-2. Since the plasma movement channel 1-2 is covered by the magnetic field generated by the magnetic field generating device, the high-speed electrons and the positively charged particles are deflected by the Lorentz force in opposite directions under the action of the magnetic field. When the direction of the magnetic field is from b to c, the high-speed electrons are ejected from the left side of the plasma sorter 1 through the connecting device into the exhaust gas reactor 2, and the positively charged particles are ejected from the right side of the plasma sorter 1. The waste gas reactor 2 is a bobbin-type reactor, the main body of which is made of a quartz glass tube, and an electron inlet is reserved on the side for high-speed electron injection. The upper and lower ends of the waste gas reactor 2 are plugged with rubber plugs to ensure that the gas is fully reacted in the waste gas reactor 2 and will not leak out. The gas circulation is ensured by opening a waste gas inlet or a waste gas outlet on the rubber plug; the self-electric regeneration magnetic rotation sorting plasma purification of coking tail waste gas system provided by the present invention uses an external magnetic field to sort out high-energy electrons, avoids the annihilation of electrons during the purification process, improves the efficiency of purification treatment, and reduces energy consumption. Secondly, through the external magnetic field, the positively charged particles sorted out move in a directional manner to generate current to supplement the electrical energy required for plasma excitation, which is the so-called "self-electric regeneration", further reducing energy consumption.

Claims

1. A self-electric regeneration magnetic rotation separation plasma purification system for coking tail gas, characterized in that: It comprises a plasma separator (1) and an exhaust gas reactor (2); The plasma separator (1) comprises a plasma generator (1-1), a magnetic field generating device and a plasma movement channel (1-2); The plasma generator (1-1) is located at the upper part of the plasma separator (1), the plasma movement channel (1-2) is located at the lower part of the plasma separator (1) and is connected to the plasma generator (1-1), and the plasma movement channel (1-2) is covered by the magnetic field generated by the magnetic field generating device; The exhaust gas reactor (2) is connected to the plasma separator (1) via a connecting device; The two ends of the exhaust gas reactor (2) are an exhaust gas inlet and an exhaust gas outlet respectively; The structure of the plasma separator (1) is a rectangular parallelepiped, the two opposite sides of the plasma movement channel (1-2) are respectively provided with an electron outlet and a positive particle outlet, the side of the exhaust gas reactor (2) is provided with an electron inlet, one end of the connecting device is connected to the electron outlet, and the other end is connected to the electron inlet; The exhaust gas reactor (2) has a cylindrical structure.

2. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 1, characterized in that: The discharge mode of the plasma generator (1-1) is one of dielectric barrier discharge, glow discharge, corona discharge or radio frequency discharge.

3. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 2, characterized in that: The discharge mode of the plasma generator (1-1) is flat-plate dielectric barrier discharge, with the dielectric material covering the positive terminal and the negative terminal being grounded.

4. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 1, characterized in that: The exhaust gas reactor (2) is a bobbin-type reactor, and the material of the exhaust gas reactor (2) is a quartz glass tube material.

5. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 4, characterized in that: Both ends of the waste gas reactor (2) are plugged with rubber plugs. A waste gas inlet is provided on the rubber plug at one end of the waste gas reactor (2), and a waste gas outlet is provided on the rubber plug at the other end.

6. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 1, characterized in that: The magnetic field generated by the magnetic field generating device is a uniform magnetic field.

7. The self-electric regeneration magnetic rotation separation plasma system for purifying coking tail gas according to claim 6, characterized in that: The movement direction of the electrons and positively charged particles generated by the plasma generator (1-1) is perpendicular to the direction of magnetic induction intensity.

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