CN108147371B - Device and method for synthesizing hydrogen peroxide from water mist through direct-current corona discharge - Google Patents
Device and method for synthesizing hydrogen peroxide from water mist through direct-current corona discharge Download PDFInfo
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- CN108147371B CN108147371B CN201810055581.7A CN201810055581A CN108147371B CN 108147371 B CN108147371 B CN 108147371B CN 201810055581 A CN201810055581 A CN 201810055581A CN 108147371 B CN108147371 B CN 108147371B
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- C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
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Abstract
The invention discloses a device and a method for synthesizing hydrogen peroxide from water mist through direct current corona discharge2And O3Separation Unit, O2Circulation unit, H2O2The device comprises a separation unit, a control unit, a pressure sensor for measuring gas-liquid pressure and a flow sensor for measuring gas-liquid flow; the invention adopts linear array type high-voltage DC corona discharge, establishes a non-equilibrium plasma processing system in water mist spray, adopts a nozzle to spray water mist jet, and has wide diffusion area and large processing flow; the linear array reactor is simple to manufacture, can reduce self capacitance and energy consumption loss, has a large-area discharge area suitable for large-flow production, adopts corona discharge, and is low in current and power consumption, and the raw material for preparing hydrogen peroxide is easy to obtain, and the yield is high, so that the linear array reactor is suitable for preparing hydrogen peroxide on a large scale.
Description
Technical Field
The invention relates to the technical field of plasma synthesis chemicals, in particular to a device and a method for synthesizing hydrogen peroxide by direct-current corona discharge water mist.
Background
In recent years, environmental application of discharge plasma has been leading to scientific research and is becoming an increasingly hot issue. As an Advanced Oxidation Process (AOPs), discharge plasmas have more remarkable characteristics, and compared with a biodegradation absorption process, the discharge plasmas have the advantages of high efficiency and high speed. In addition, the discharge plasma (APP) can be generated at atmospheric pressure or higher, expensive vacuum equipment is not needed, and the method has more economic and application values. What is needed isThe discharge plasma APPs have good application prospects in the fields of air purification, water treatment, ozone synthesis, surface treatment, biomedicine, material modification and the like. Discharge plasma in air, accompanied by Ultraviolet (UV) radiation and electron impact, can generate a large amount of active species, such as hydroxyl radicals (OH), oxygen radicals (O), nitrogen oxides (NOx), ozone (O)3) And other active species. In environmental applications, hydroxyl radicals (OH), oxygen radicals (O), are very important.
At present, hydrogen peroxide (H)2O2) Is generally considered an important agent in green chemistry because water is H2O2The hydrogen peroxide is an important chemical raw material and is widely applied to the fields of paper pulp bleaching, electronic industry, sewage treatment, chemical synthesis and the like. Currently, the vast majority of H worldwide2O2 The anthraquinone process is adopted for production, and the anthraquinone process for producing hydrogen peroxide has the serious problems of complex process, large equipment investment, environmental pollution and the like. The hydrogen and oxygen are directly synthesized into H by adopting noble metal supported catalysts such as palladium, gold and the like2O2 There have been many studies, but the process has the disadvantage that high selectivity and high conversion rate cannot be obtained, and the produced product is O2Separation is needed, etc. The non-equilibrium plasma is widely applied to the fields of material treatment and environmental protection, and has good application prospect in the fields of chemical conversion and synthesis. H synthesized by activating oxyhydrogen molecules with non-equilibrium plasma2O2Although there are reports in the early 60 s of the last century, H is produced2O2 The yield of (a) is low.
Disclosure of Invention
The invention aims to solve the problem of H synthesis by activating hydroxyl molecules with non-equilibrium plasma2O2 The yield of (A) is low.
In order to achieve the above object, the present invention adopts the following technical solutions:
the device for synthesizing hydrogen peroxide from water mist through direct-current corona discharge is characterized in that:
the device comprises a gas-liquid inlet control unit, a gas-liquid mixing generation unit, a high-pressure excitation unit, a gas-liquid separation unit and an O2、O3Separation Unit, O2Circulation unit, H2O2 The device comprises a separation unit, a control unit, a flow sensor, a liquid pump and an air pump;
the gas-liquid mixing generation unit comprises a gas-liquid atomization unit and a corona discharge unit;
said O is2 The circulation unit contains O2 A reservoir and an air pump; the corona discharge unit adopts a linear array reactor; the gas-liquid atomization unit comprises an atomization nozzle; the high-voltage excitation unit comprises a high-voltage direct-current power supply; the device terminal comprises O3Storage, H2O2 Storing and solution storing;
the outlet of the gas-liquid inlet control unit is connected with the inlet of the gas-liquid atomization unit in the gas-liquid mixing generation unit; the outlet of the high-voltage excitation unit is connected with the inlet of the corona discharge unit;
the outlet of the gas-liquid mixing generation unit is connected with the inlet of the gas-liquid separation unit;
outlet of the gas-liquid separation unit and O2、O3Separation unit and H2O2The inlets of the separation units are connected;
said O is2、O3One outlet of the separation unit and O2The inlets of the air pumps in the circulating units are connected; o is2、O3 The other outlet of the separation unit is connected with the O through an air pump3The storage inlets are connected;
said O is2 Outlet of air pump and O in circulation unit2 The inlets of the storages are connected; said O is2The outlet of the storage is connected with the gas source inlet in the gas-liquid inlet control unit;
said H2O2One outlet of the separation unit is connected with a solution storage inlet, and the solution storage outlet is connected with a liquid source inlet through a liquid pump; the outlet of the liquid source is connected to the inlet of the gas-liquid inlet control unit; h2O2 Another outlet of the separation unit and H2O2 the storage inlets are connected;
the outlet of the control unit is respectively connected with a gas-liquid inlet control unit and an O2Circulation unit, O2、O3 Separation unit and H2O2 The inlets of the separation units are connected;
the gas source is connected to the gas-liquid inlet control unit through a flow sensor; the liquid source is connected to the gas-liquid inlet control unit through a flow sensor; the outlet of the flow sensor is connected with the inlet of the control unit;
the control unit is respectively connected with the liquid pump and the air pump through 2 drivers;
the gas-liquid inlet control unit, the gas-liquid separation unit, and the O2、O3Separation Unit, O2 Circulation unit and H2O2 A valve is arranged in the separation unit;
and a flow sensor and a pressure sensor are arranged in the gas-liquid mixing generation unit.
(II) the method for synthesizing hydrogen peroxide by using the device is characterized in that: the method comprises the following steps:
(1) opening a liquid source valve to introduce a liquid source, opening an air source valve to introduce an air source, and starting a liquid pump driver by a control unit to enable a liquid pump to mix and pump a solution in a solution storage with the air source and the liquid source to mix to a nozzle;
(2) the control unit regulates a liquid pump driver switch and an air pump driver switch to control the liquid and air pressure; the control unit adjusts the rotation speed of the liquid pump and controls the flow of liquid and gas through the valve by the liquid pump driver; keeping the atomizing nozzle open for a period of time, and then starting a high-voltage direct-current power supply to excite the linear array reactor to discharge;
(3) by controlling O by means of valves3Into O3 Storage, by valve control O2、O3O separated in a separator2Into O2A reservoir; when O is present2 The stored pressure forms a pressure difference with the atmospheric pressure, and O is controlled by a valve2Pumping the air source for recycling;
(4) controlled by valvesIntroducing H into the synthesized hydrogen peroxide solution2O2Separating and purifying by a separator; detecting the concentration of hydrogen peroxide, and introducing the hydrogen peroxide into a storage if the concentration of the hydrogen peroxide reaches the standard; if the standard is not met, the step is repeated until the standard is met.
The invention has the beneficial effects that: the invention adopts linear array type high-voltage DC corona discharge, establishes a non-equilibrium plasma processing system in water mist spraying, adopts a nozzle to spray water mist jet, and has wide diffusion area and large processing flow. The linear array reactor is simple to manufacture, can reduce self capacitance and energy consumption loss, can be suitable for large-flow production in a large-area discharge area, and is low in current and power consumption due to the adoption of corona discharge; the hydrogen peroxide prepared by the method has easily obtained raw materials and high yield, so the method is suitable for preparing hydrogen peroxide on a large scale and is an environment-friendly synthetic H2O2 A method.
Drawings
FIG. 1 is a frame diagram of the apparatus of the present invention;
FIG. 2 is a block diagram of an apparatus according to an embodiment of the present invention;
FIG. 3 is a system workflow diagram of the method of the present invention;
FIG. 4 is a block diagram of the main body of the apparatus according to one embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an atomizing unit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a negative electrode layer, a positive electrode layer, and a module;
FIG. 7 is a schematic diagram of a corona discharge reaction zone configuration;
FIG. 8 is a side view of a corona discharge reaction;
FIG. 9 is a schematic cross-sectional view of a reaction zone in accordance with an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of a reactor according to an embodiment of the present invention;
FIG. 11 is a control unit system diagram of an embodiment of the present invention;
FIG. 12 is a schematic diagram of a control unit of an embodiment of the present invention;
FIG. 13 is a schematic diagram of the operation of a solenoid valve according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Device for synthesizing hydrogen peroxide by constructing direct-current corona discharge water mist
FIG. 2 is a view showing the construction of the apparatus of the present embodiment; in FIG. 2, a valve V1 controls the inflow of the initial liquid source, and a valve V2 controls the inflow H of the synthesized hydrogen peroxide2O2 In the separator, valve V3 controls H2O2The residual solution after separation in the separator is recycled, the valve V4 controls the inflow of the gas source, and the valve V5 controls the H2O2Hydrogen peroxide separated in the separator enters H2O2 Stored in storage for subsequent use, valve V6 controls O3、O2O separated in a separator3Into O3Stored in storage for subsequent use, valve V7 controls O3、O2O separated in a separator2Into O2Valve V8 for O to be recycled in the storage2O in the storage2 And discharging for recycling. M1 is a liquid pump, and the liquid source is H2O2Circularly pumping the residual solution and the liquid source after separation in the separator, wherein M2 is an air pump for pumping O2O in the storage2Pumping into air source. DC is high voltage DC power supply. PM1, PM2 and PM3 are pressure sensors, PM1 and PM2 measure the pressure of gas and liquid in the atomizing nozzle, PM3 measures O2 Reservoir inlet pressure. FM1 is a flow sensor that measures the flow rate of the solution pumped into the nozzle, and FM2 is a flow sensor that measures the flow rate of the gas pumped into the nozzle. The device controls the flow of the liquid source through the control unit, and the control unit controls the rotating speed of the liquid pump M1 through a driver of the liquid pump M1; the control unit controls the opening and closing of the electromagnetic valves V1-V8 and regulates and controls the water mist jet flow fog beads at the same timeThe particle size and the water content of the particles realize the real-time automatic regulation and control function, so that the device can work efficiently and automatically.
In order to further explain the included angle of the water mist jet formed by the nozzles arranged in the gas-liquid atomizing unit according to the embodiment of the present invention, the present invention will be described in some detail with reference to fig. 5 and the specific embodiment.
FIG. 5 is a schematic diagram of an atomizing unit according to an embodiment of the present invention;
in FIG. 5, the container has a length L and a width W, and the gas-liquid mixture generating unit has a height H of the atomizing unit1Wherein the height of the corona discharge unit is H2The height of the storage container right below the storage container is H3. Water mist jet included angle formed by nozzle
And a height H1The following can be obtained:
to further illustrate the principles of the gas-liquid atomization unit, the present invention is described in some detail with reference to specific embodiments.
The atomizing nozzle atomizes the material by utilizing the dispersion effect of compressed air, and the air atomizing nozzle generates mist by mutually influencing air flow and liquid flow so as to uniformly mix liquid and gas and generate spray with fine droplet size or coarse droplet spray. The liquid drop sprays with different particle sizes can be obtained by adjusting the gas pressure or reducing the liquid pressure, so that the gas flow rate and the liquid flow rate ratio are adjusted and the water content is controlled.
The particle size of atomized fog beads is closely related to the pressure difference between the inside and the outside of the nozzle, the proportion of water and gas and other parameters. In one embodiment of the apparatus shown in fig. 2, the pressure difference between the inside and the outside of the atomizing nozzle is fixed, the pressure difference controls the liquid phase pressure and the gas phase pressure respectively through the pressure sensors PM1 and PM2, and the water content is changed to adjust the particle size of the mist droplets of the water mist. The volume flow of water and gas can be changed by adjusting the liquid pump M1 and the adjusting valve V4, and the flow of water and gas can be detected by a flow sensor.
Active substances generated by discharge in a water mist environment mainly exist in a gas phase, and the large specific surface area of the fog beads is beneficial to the diffusion and mass transfer of the active substances and the fog beads in the gas phase. In the device, the water content is controlled to be 5-10% to generate the best effect of the active substance, and the particle size range of the fog beads is controlled to be 15-60 mu m. Gas-liquid volumetric flow rate is known through flow sensor Q V Then the flow rate can be obtainedV：
Wherein the content of the first and second substances,
the density of the solution is the density of the solution,Sis the cross-sectional area of the conduit,Q V is the gas-liquid volume flow. The device recommends controlling the flow rate at 2.0-3.5 m/s.
To further illustrate the wire array type dc positive corona discharge principle of the present invention, the present invention will be described in detail with reference to fig. 6, 7, and 8 in conjunction with specific embodiments.
FIG. 6 shows a schematic of the negative electrode layer, positive electrode layer, module; in fig. 6, a screw hole is formed at each of four corners of the negative electrode layer and the positive electrode layer, and the screw holes of the negative electrode layer and the positive electrode layer are screwed together to form a module.
FIG. 7 shows a schematic diagram of a corona discharge reaction zone configuration; in fig. 7, cover plates made of insulating material are arranged on two sides of the corona discharge reaction zone, and electrode wires led out from a plurality of positive electrode layers and electrode wires led out from a plurality of negative electrode layers penetrate through small holes of the cover plates on the two sides and are respectively connected to the positive end and the negative end of a high-voltage power supply. If the positive and negative electrode wires are directly led out from the corona discharge reaction zone, the danger coefficients of human bodies and equipment can be increased, and the cover plates are additionally arranged on the two sides of the corona discharge reaction zone to prevent the occurrence of the above conditions.
FIG. 8 shows electricityA corona discharge reaction zone side view; in fig. 8, the negative electrode layer and the positive electrode layer are arranged alternately, wherein it should be noted that the low voltage electrode is tightly attached to the front, back, upper and lower sides of the corona discharge reaction zone, and the high voltage electrode is located in the middle, so as to prevent the electric leakage and electric shock phenomena in the actual process. The electrode distance d of the linear array reactor is negligible because the section diameter of the electrode is far smaller than the length and width of the container, so the number N of the electrodes of the negative electrode layer can be obtained1Comprises the following steps:
in the formula (3), W is the width of the corona discharge unit, and d is the electrode spacing of the linear array reactor;
number of positive electrode layers N2Comprises the following steps:
in the formula (4)W Is the width of the corona discharge unit,dis the electrode spacing of the linear array reactor; the number of electrodes N in a module consisting of a negative electrode layer and a positive electrode layer3Comprises the following steps:
n in formula (5)1 Number of electrodes of negative electrode layer, N2Is the number N of positive electrode layers2；
In the formula (6), W is the width of the corona discharge unit, and d is the electrode spacing of the linear array reactor; the number of modules N in the corona discharge reaction zone4Comprises the following steps:
h in the formula (7)2For corona discharge unit high, b is the distance between the negative electrode layer and the positive electrode layer:
in the formula (8), the included angle between the connecting line of the adjacent beta positive and negative electrodes and a plumb line, and d is the electrode spacing of the linear array reactor; since the lowest layer of the corona discharge reaction area must be the negative electrode layer, the number of electrodes N of the corona discharge reaction area is:
in the formula (10)bIs the distance between the negative electrode layer and the positive electrode layer, N1Number of electrodes of negative electrode layer, N3The number of electrodes in a module consisting of a negative electrode layer and a positive electrode layer, N4The number of modules in the corona discharge reaction zone, W the width of the corona discharge unit, d the electrode spacing of the wire array reactor, H2 Is corona discharge unit high.
To further illustrate the structure and principle of the corona discharge unit, the present invention will be described in detail with reference to fig. 9 and 10 in conjunction with specific embodiments.
In the invention, the high-voltage output range is adjusted to 6-30kV by adopting linear array type direct-current positive corona discharge. Meanwhile, the linear reactor adopting the array reduces the self capacitance of the reactor and avoids the energy consumption loss, the material is tungsten-molybdenum alloy, and fig. 9 shows that the linear reactor of the invention has one embodimentIn FIG. 9, the electrodes on adjacent horizontal planes are connected to DC high voltage power supply and ground respectively, and are arranged in staggered array to make the discharge reaction range large, the reaction time sufficient, and it is favorable to produce large amount of H2O2And O3Is suitable for preparing H2O2 The apparatus of (1). FIG. 10 is a schematic cross-sectional view of a reactor according to an embodiment of the present invention, in FIG. 10, the distance d between adjacent electrodes of the wire array reactor is in the range of 3.00-9.00cm, and a regular triangle is formed between the adjacent three electrodes.
To further illustrate the air corona discharge principle, some details are set forth below in connection with the present invention.
The air corona discharge principle of the invention is as follows: under the excitation of a high-voltage power supply, space charges are gathered near the tip electrode by the corona of the negative electrode, an electron avalanche process is formed after electrons cause impact ionization, the electrons are driven to a space far away from the tip electrode and form negative ions, and positive ions are gathered near the surface of the electrode. When the electric field is continuously strengthened, positive ions are absorbed into the electrode, high-voltage corona current appears at the time, and negative ions are diffused to the gap space. Thereafter the next ionization and charged particle movement process is repeated. So cycling occurs that a number of corona currents occur in the form of pulses. During the corona discharge, the following three strongly oxidizing species are mainly generated: a, high energy particles: under the action of strong electric field, the tip of the electrode will generate electrons e with certain energy, and the energy of the electrons is related to the electric field intensity applied by the electrode when micro-discharge occurs. Oxygen atom: the electrons with certain energy collide with oxygen molecules in the air to cause the dissociation of the oxygen molecules, so as to generate oxygen atoms, and the reaction formula is as follows:
c. ozone: the oxygen atoms with certain energy collide with oxygen molecules to react to generate ozone, and the reaction formula is as follows:
wherein M represents a third participating molecule.
It produces H2O2The main principle of the method is as follows:
the main reactions of the corona discharge plasma adopted by the device comprise electron collision, photolysis and secondary reaction. The electron mean electron energy in the corona discharge plasma is about 1-10eV, which is sufficient to decompose water molecules H2O and oxygen molecules O2And the discharge region is accompanied by intense uv radiation. Therefore, active substances such as hydroxyl radical (OH), oxygen atom (O), and hydrogen radical (H) are generated by electron collision and ultraviolet photolysis, and the main reaction formula is as follows:
where eV is electron volts.
Due to the third molecule M (N) acting as a carrier of thermal energy2Or H2O), some O in the discharge region will react with O2React to generate O3The reaction formula is as follows:
OH free radicals generated by reactive electron collision and ultraviolet photolysis are combined with each other to generate H2O2The reaction formula is as follows:
the device adopts positive corona high-voltage discharge, adopts a high-voltage direct-current power supply to excite a reactor to discharge, and has the principle that when liquid is used as an anode, the cathode voltage is reduced to form on an electrode, so that sputtering and electric field induced ion emission do not exist on the surface of the liquid, and water molecules are transferred from a liquid phase to gas plasma only by an evaporation method. In the case of the liquid anode, the cathode water molecule count is not significantly less than in the case of the liquid as the cathode, resulting in a low H2O2The yield is determined by selecting a direct current positive corona discharge mode.
To further illustrate the selection principle of the gas source and the liquid source of the present invention, the following detailed description is made.
(1) Liquid source selection principle the device prepares H by gas-liquid mixing atomization mode2O2The raw material has higher yield than NaOH alkaline solution because of H2O2Is a weak acid which reacts with OH-in concentrated NaOH solution to form HO2-, the reaction formula is as follows:
thus, H produced2O2Consumption by reaction with NaOH, resulting in very low H2O2 Yield. Due to H2O2The generation rate of (a) strongly depends on the plasma-liquid interaction of the liquid surface, such as sputtering, high electric field induced emission and evaporation of hydrated ions, so the device uses a weak acid solution with a pH value of 6-7, preferably deionized water, ultra-pure water.
Selection principle of air source
The device selects oxygen or air as gas phase raw material (gas source), and oxygen is recommended to be adopted, and the principle is as follows, because most of nitrogen is contained in the air, NO and NO can be generated in the discharging process2The reaction mechanism of the harmful active substances is as follows:
the main reactions in the discharge process include electron collision, photolysis, and secondary reactions. The average energy of electrons in the discharge plasma is about 1-10 eV. The main reaction is electron collision at different electron energies:
the discharge plasma generation process is accompanied by secondary reactions, H2O and O2The molecule is dissociated:
in the plasma region, the excited O energy and N2The molecule reacts, and N reacts with OH generated. Some of the O energy being in combination with O2Generation of O3Some of O3With NO to NO2The reaction equation is as follows:
furthermore, in the environment of high intensity uv radiation, mainly photolytic reactions, as follows:
production of NOXAnother approach of (2) is to hydrate electrons
And OH. The main equations that this process may involve are as follows:
in the above formula, x =1 or 2, and y =0 or 1.
Generated NO2 And H2O reacts to generate an acid substance HNOX, and the main reaction formula is as follows:
and NO2Dissolving in water to form HNO3In solution with NO3-Make the solution acidic and H2O2 Becomes weakly acidic and will inhibit H2O2Reducing the yield thereof.
To further illustrate the overall structure of the control unit principle of the present invention, the present invention will be described in some detail with reference to fig. 11 and 12 in conjunction with specific embodiments.
FIG. 11 is a system diagram showing the control unit of the present embodiment;
FIG. 12 is a schematic view showing a control unit of the present embodiment;
in fig. 11, the control unit of the device measures the gas-liquid pressure through pressure sensors PM1 and PM2, measures the gas-liquid flow through flow sensors FM1 and FM2, controls the liquid flow through controlling the rotation speed of the liquid pump M1, and fixes the gas flow, thereby adjusting the water content of the mist jet and the particle size of the mist beads. Further, O is detected by a pressure sensor2The pressure difference between the reservoir and the outside controls the switch of the electromagnetic valve and the switch of the air pump M2. The device controls the switches of all the electromagnetic valves through the MCU to control the inflow and outflow of fluid.
In fig. 12, the MCU may select a single chip microcomputer of STC12C, STM32, STC89 series from STC corporation. The recommended use is packaged as SOP-20, an 8-bit ADC and a general GP port are arranged in a single chip microcomputer, the speed can reach 100kHZ, and 8-path ADC modules can be used for key detection, liquid pump rotating speed detection, flow detection, pressure detection, electromagnetic valve switch detection and the like. The pressure sensor can convert gas-liquid flow and pressure detected by the pressure sensor and the flow sensor into voltage signals, the voltage signals are collected and transmitted to an ADC port of the MCU, and then the MCU controls the operation of the whole system according to the collected signals. The display screen is connected with the GP port, and the usable models of the display screen are LCD1602, LCD12864, LCD16864, LCD12232 and the like.
The whole control system comprises a pressure sensor, a flow sensor, an electromagnetic valve V1-V8, a liquid pump M1, a switch key, an MCU power supply, a display unit and a high-voltage power supply switch control which are connected with the ADC end of the MCU; the main switch key controls the operation of the whole device, and the device starts to work normally after being closed. The pressure sensor and the flow sensor convert the collected signals into voltage signals, and the voltage signals are transmitted to the MCU for ADC conversion and then transmitted to the display screen. The display unit is connected with the output port of the singlechip and mainly displays whether the machine works normally, the current gas-liquid flow, the gas-liquid pressure, the on-off condition of the electromagnetic valve and other parameters. Meanwhile, the on-off condition of the electromagnetic valve is controlled by the MCU through a feedback signal.
In order to further explain the working principle of the control unit of the present invention for automatically controlling the on and off states of each switch through the solenoid valve switch, the present invention will be explained in some detail with reference to fig. 13. Fig. 13 shows an operational principle diagram of the solenoid valve of the present embodiment.
In fig. 13, the device adopts a solenoid valve switch, and the opening and closing states are automatically controlled by a control unit. When the electromagnetic valve is electrified, the electromagnetic coil generates electromagnetic force to directly attract the magnetic core, the magnetic core shifts, and the valve is opened; when the power is cut off, the magnetic force disappears, the magnetic core is reset by the spring, and the valve is closed.
Working principle of pressure sensor semiconductor piezoelectric impedance diffusion pressure sensor is that semiconductor deformation pressure is formed on the surface of a sheet, the sheet is deformed through external force (pressure) to generate piezoelectric impedance effect, so that impedance change is converted into an electric signal, and the current pressure can be obtained from the output electric signal. The device can adopt pressure transmitters of CAD1200/1600 series, 2200/2600 series, 6700 series and the like of Gems company.
The device uses the principle of a flow sensor based on Faraday's law of electromagnetic induction, and when the conductive liquid passes through two electrodes in the direction perpendicular to the magnetic field at the average flow speed, corresponding electromotive force is generated between the electrodes and is obtained according to the relation between the electric field intensity and the flowing volume flow. The device can adopt RFO type electronic flow meter, RFA type electronic flow meter and the like of Gems company.
The device for separating oxygen and ozone utilizes a heat exchanger and a cold medium to reduce the temperature of the mixed gas of ozone and oxygen to be between the boiling point temperature of ozone and the boiling point temperature of oxygen, so that ozone is converted into liquid, and oxygen is still in gaseous state, thereby separating the mixed gas of oxygen and ozone.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The device for synthesizing hydrogen peroxide by direct-current corona discharge water mist is characterized in that: the device comprises a gas-liquid inlet control unit, a gas-liquid mixing generation unit, a high-pressure excitation unit, a gas-liquid separation unit and an O2、O3Separation Unit, O2Circulation unit, H2O2 The device comprises a separation unit, a control unit, a flow sensor, a liquid pump and an air pump;
the gas-liquid mixing generation unit comprises a gas-liquid atomization unit and a corona discharge unit;
said O is2The circulation unit contains O2 A reservoir and an air pump; the corona discharge unit adopts a linear array reactor; the gas-liquid atomization unit comprises an atomization nozzle; the high-voltage excitation unit comprises a high-voltage direct-current power supply; the device terminal comprises O3 Storage, H2O2 Storing and solution storing;
the outlet of the gas-liquid inlet control unit is connected with the inlet of the gas-liquid atomization unit in the gas-liquid mixing generation unit; the outlet of the high-voltage excitation unit is connected with the inlet of the corona discharge unit;
the outlet of the gas-liquid mixing generation unit is connected with the inlet of the gas-liquid separation unit;
outlet of the gas-liquid separation unit and O2、O3Separation unit and H2O2The inlets of the separation units are connected;
said O is2、O3One outlet of the separation unit and O2The inlets of the air pumps in the circulating units are connected; o is2、O3The other outlet of the separation unit is connected with the O through an air pump3The storage inlets are connected;
said O is2Outlet of air pump and O in circulation unit2The inlets of the storages are connected; said O is2The outlet of the storage is connected with the gas source inlet in the gas-liquid inlet control unit;
said H2O2 One outlet of the separation unit is connected with a solution storage inlet, and the solution storage outlet is connected with a liquid source inlet through a liquid pump; the outlet of the liquid source is connected to the inlet of the gas-liquid inlet control unit; h2O2Another outlet of the separation unit and H2O2The storage inlets are connected;
the outlet of the control unit is respectively connected with a gas-liquid inlet control unit and an O2Circulation unit, O2、O3Separation unit and H2O2The inlets of the separation units are connected;
the gas source is connected to the gas-liquid inlet control unit through a flow sensor; the liquid source is connected to the gas-liquid inlet control unit through a flow sensor; the outlet of the flow sensor is connected with the inlet of the control unit;
the control unit is respectively connected with the liquid pump and the air pump through 2 drivers;
the gas-liquid inlet control unit, the gas-liquid separation unit, and the O2、O3Separation Unit, O2Circulation unit and H2O2A valve is arranged in the separation unit;
and a flow sensor and a pressure sensor are arranged in the gas-liquid mixing generation unit.
2. The device for synthesizing hydrogen peroxide from DC corona discharge water mist according to claim 1, is characterized in that: the output regulating high voltage range of the linear array reactor is 6-30 kV.
3. The device for synthesizing hydrogen peroxide from DC corona discharge water mist according to claim 1, is characterized in that: the material of the linear array reactor is tungsten-molybdenum alloy.
4. The device for synthesizing hydrogen peroxide from DC corona discharge water mist according to claim 1, is characterized in that: the distance between adjacent electrodes of the linear array reactor ranges from 3.00 cm to 9.00 cm.
5. The device for synthesizing hydrogen peroxide from DC corona discharge water mist according to claim 1, is characterized in that: the included angle range of the water mist jet flow of the atomizing nozzle is 90-135 degrees.
6. The device for synthesizing hydrogen peroxide from DC corona discharge water mist according to claim 1, is characterized in that: the control unit automatically controls the opening and closing states of the valves through the electromagnetic valves.
7. The method for synthesizing hydrogen peroxide by the device for synthesizing hydrogen peroxide by water mist through direct current corona discharge according to any one of claims 1 to 6 is characterized by comprising the following steps: the method comprises the following steps:
(1) opening a liquid source valve to introduce a liquid source, opening an air source valve to introduce an air source, and starting a liquid pump driver by a control unit to enable a liquid pump to mix and pump a solution in a solution storage with the air source and the liquid source to mix to a nozzle;
(2) the control unit regulates a liquid pump driver switch and an air pump driver switch to control the liquid and air pressure; the control unit adjusts the rotation speed of the liquid pump and controls the flow of liquid and gas through the valve by the liquid pump driver; keeping the atomizing nozzle open for a period of time, and then starting a high-voltage direct-current power supply to excite the linear array reactor to discharge;
(3) by controlling O by means of valves3Into O3Storage, by valve control O2、O3O separated in a separator2Into O2A reservoir; when O is present2 The stored pressure forms a pressure difference with the atmospheric pressure, and O is controlled by a valve2Pumping the air source for recycling;
(4) the synthesized hydrogen peroxide solution is introduced into H under the control of a valve2O2Separating and purifying by a separator; detecting the concentration of hydrogen peroxide, and introducing the hydrogen peroxide into a storage if the concentration of the hydrogen peroxide reaches the standard; if the standard is not met, the step is repeated until the standard is met.
8. The method for synthesizing hydrogen peroxide by using the device for synthesizing hydrogen peroxide from DC corona discharge mist according to claim 7, which is characterized by comprising the following steps: the pH value of the liquid source is 6-7 weak acid solution.
9. The method for synthesizing hydrogen peroxide by using the device for synthesizing hydrogen peroxide from DC corona discharge mist according to claim 7, which is characterized by comprising the following steps: the gas source is oxygen.
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| IL258383A (en) * | 2018-03-26 | 2018-05-31 | Riskin Yefim | Method and device for conversion of water into hydrogen peroxide |
| CN113683058B (en) * | 2021-08-02 | 2023-09-19 | 南京工业大学 | Device for synthesizing hydrogen peroxide by utilizing underwater bubbling multi-mode discharge |
Citations (5)
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| GB191125681A (en) * | 1911-11-17 | 1913-02-17 | Johannes Haerden | Improvements relating to the Production of Hydrogen Peroxide. |
| CN1087600A (en) * | 1992-11-20 | 1994-06-08 | 昭和电工株式会社 | The production of hydrogen peroxide method |
| CN1546367A (en) * | 2003-11-28 | 2004-11-17 | 大连理工大学 | Method and device for directly synthesizing hydrogen peroxide at room temperature |
| CN102203004A (en) * | 2008-10-28 | 2011-09-28 | 阿肯马法国公司 | Method for producing hydrogen peroxide |
| CN103482735A (en) * | 2013-09-09 | 2014-01-01 | 河海大学常州校区 | Water spray discharge air plasma jet processing device and high-voltage power source thereof |
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| GB191125681A (en) * | 1911-11-17 | 1913-02-17 | Johannes Haerden | Improvements relating to the Production of Hydrogen Peroxide. |
| CN1087600A (en) * | 1992-11-20 | 1994-06-08 | 昭和电工株式会社 | The production of hydrogen peroxide method |
| CN1546367A (en) * | 2003-11-28 | 2004-11-17 | 大连理工大学 | Method and device for directly synthesizing hydrogen peroxide at room temperature |
| CN102203004A (en) * | 2008-10-28 | 2011-09-28 | 阿肯马法国公司 | Method for producing hydrogen peroxide |
| CN103482735A (en) * | 2013-09-09 | 2014-01-01 | 河海大学常州校区 | Water spray discharge air plasma jet processing device and high-voltage power source thereof |
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