CN213726416U - Device for synthesizing ammonia - Google Patents
Device for synthesizing ammonia Download PDFInfo
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- CN213726416U CN213726416U CN202022714919.0U CN202022714919U CN213726416U CN 213726416 U CN213726416 U CN 213726416U CN 202022714919 U CN202022714919 U CN 202022714919U CN 213726416 U CN213726416 U CN 213726416U
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 59
- 230000002194 synthesizing effect Effects 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 63
- 230000004888 barrier function Effects 0.000 claims abstract description 58
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003054 catalyst Substances 0.000 claims abstract description 41
- 239000001257 hydrogen Substances 0.000 claims abstract description 38
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- 230000002265 prevention Effects 0.000 claims abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 230000000151 anti-reflux effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 18
- 238000003786 synthesis reaction Methods 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000002195 synergetic effect Effects 0.000 abstract description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract 1
- 210000002381 plasma Anatomy 0.000 description 37
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 12
- 238000006555 catalytic reaction Methods 0.000 description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007036 catalytic synthesis reaction Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000009620 Haber process Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000005676 thermoelectric effect Effects 0.000 description 1
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Abstract
本实用新型涉及氨合成技术领域，具体涉及一种合成氨的装置，所述装置包括：依次连接的微波电源，微波防回流装置，三销钉调配器，微波同轴谐振腔，介质阻挡放电反应器；介质阻挡放电反应器与纳秒脉冲电源相连，且其内部填充有催化剂；氮气源和氢气源，与微波同轴谐振腔的气体入口相连。氮气和氢气的混合气体在微波同轴谐振腔开口处形成大气压氮气氢气微波放电等离子体；产生的大气压氮气氢气微波放电等离子体与介质阻挡放电反应器内生成的等离子体共同作用，并且在介质阻挡放电反应器内的催化剂的协同作用下，实现氨的合成，并且能够实现对气体与催化剂表面温度的分开控制，生成氨的转化效率和产额较高。
The utility model relates to the technical field of ammonia synthesis, in particular to a device for synthesizing ammonia. The device comprises: a microwave power supply connected in sequence, a microwave backflow prevention device, a three-pin dispenser, a microwave coaxial resonant cavity, and a dielectric barrier discharge reactor; The dielectric barrier discharge reactor is connected with the nanosecond pulse power supply, and the inside of the reactor is filled with catalyst; the nitrogen source and the hydrogen source are connected with the gas inlet of the microwave coaxial resonant cavity. The mixed gas of nitrogen and hydrogen forms atmospheric pressure nitrogen and hydrogen microwave discharge plasma at the opening of the microwave coaxial resonant cavity; the generated atmospheric pressure nitrogen and hydrogen microwave discharge plasma works together with the plasma generated in the dielectric barrier discharge reactor, and the plasma is generated in the dielectric barrier discharge reactor. Under the synergistic effect of the catalysts in the discharge reactor, the synthesis of ammonia is realized, and the temperature of the gas and the surface of the catalyst can be separately controlled, and the conversion efficiency and yield of the generated ammonia are high.
Description
Technical Field
The utility model relates to the technical field of ammonia synthesis, in particular to a device for synthesizing ammonia.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
Ammonia is a very important chemical substance and an important raw material for industrial and agricultural production. Ammonia also has a high energy density and hydrogen content and is a potential hydrogen storage carrier. The Haber-Bosch process, which is currently used for the industrial large-scale synthesis of ammonia, is energy-consuming and has a negative impact on the environment. Under the conditions of increasingly prominent environmental problems and energy shortage, the exploration of a green, energy-saving and sustainable ammonia synthesis technology is urgent.
The plasma contains a large amount of high-energy electrons, active particles, excited particles and free radicals, can excite, dissociate or ionize nitrogen and hydrogen molecules under the conditions of low temperature and normal pressure, and the plasma synthesis of ammonia takes the nitrogen and the hydrogen as raw material gases and is combined with the conventional catalytic synthesis of ammonia, so that the yield and the energy efficiency of the synthesis of ammonia can be effectively improved, and the method is an effective ammonia synthesis method. However, most of the traditional catalytic ammonia synthesis devices cannot separately control the surface temperature of gas and catalyst, so that the defects of low conversion efficiency, low yield and the like are caused.
SUMMERY OF THE UTILITY MODEL
To the technical problem that exists among the above-mentioned prior art, the utility model aims at providing a device of synthetic ammonia, through the synergistic effect of microwave discharge, dielectric barrier discharge reactor and catalyst, under the atmospheric pressure low temperature condition, realize plasma catalysis synthetic ammonia.
Specifically, the technical scheme of the utility model is as follows:
an apparatus for synthesizing ammonia, comprising:
the microwave anti-backflow device comprises a microwave power supply, a microwave anti-backflow device, a three-pin tuner, a microwave coaxial resonant cavity and a dielectric barrier discharge reactor which are connected in sequence;
the dielectric barrier discharge reactor is connected with a nanosecond pulse power supply, and a catalyst is filled in the dielectric barrier discharge reactor;
and the nitrogen source and the hydrogen source are connected with the gas inlet of the microwave coaxial resonant cavity.
A method for synthesizing ammonia, comprising the steps of:
forming atmospheric nitrogen and hydrogen microwave discharge plasma at the opening of the microwave coaxial resonant cavity by using the mixed gas of nitrogen and hydrogen;
the generated atmospheric pressure nitrogen and hydrogen microwave discharge plasma and the plasma generated in the dielectric barrier discharge reactor act together, and the synthesis of ammonia is realized under the synergistic action of the catalyst in the dielectric barrier discharge reactor.
The utility model discloses a concrete implementation has following beneficial effect:
the utility model discloses an among the embodiment, inside and the dielectric barrier reactor that discharges of nitrogen gas hydrogen mist process microwave discharge's resonant cavity, through the microwave discharge, the dielectric barrier reactor that discharges and the synergistic effect of catalyst, under the atmospheric pressure low temperature condition, realize plasma catalytic synthesis ammonia, can realize the separate control to gas and catalyst surface temperature, the conversion is high, and the yield is also high.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
FIG. 1 is a schematic diagram of an apparatus for ammonia synthesis according to one or more embodiments of the present invention;
the device comprises a microwave power supply 1, a circulator 2, a water load 3, a three-pin matcher 4, a three-pin matcher 5, a microwave energy inlet 6, a gas inlet 7, a gas outlet 8, a microwave coaxial resonant cavity 9, a dielectric barrier discharge reactor 10, a high-voltage electrode 11, a nanosecond pulse power supply 12, an infrared thermal imager 13, a gas chromatograph 14, a container filled with sulfuric acid solution 15, a Rogowski coil 16, a grounding electrode 17, a tubular furnace 18, an oscilloscope 19, a computer 20, nitrogen, 21, hydrogen, 22, a pressure reducing valve 23, a flowmeter 24, a thermocouple thermometer 25, an air heater 26, a flow equalizer 27 and a catalyst.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In one embodiment of the present invention, there is provided an apparatus for ammonia synthesis, comprising:
the microwave anti-backflow device comprises a microwave power supply, a microwave anti-backflow device, a three-pin tuner, a microwave coaxial resonant cavity and a dielectric barrier discharge reactor which are connected in sequence;
the dielectric barrier discharge reactor is connected with a nanosecond pulse power supply, and a catalyst is filled in the dielectric barrier discharge reactor;
and the nitrogen source and the hydrogen source are connected with the gas inlet of the microwave coaxial resonant cavity.
The microwave power supply is used for driving microwave discharge; the microwave discharge is a discharge plasma device which uses a waveguide or a transmission line to transmit microwave energy under the excitation of a microwave power supply and forms non-equilibrium discharge plasma in a microwave resonant cavity. Compared with other gas discharge, the microwave discharge has the advantages of uniformity, stability, high energy conversion efficiency, no electrode pollution, high density of charged particles and active particles and the like.
The microwave backflow preventer is used for isolating the reflected wave and preventing the reflected wave from damaging the microwave power supply;
the three-pin tuner is used for carrying out impedance matching on the microwave transmission system;
and the microwave coaxial resonant cavity forms atmospheric pressure nitrogen and hydrogen microwave discharge plasma at the opening of the coaxial resonant cavity.
The dielectric barrier discharge reactor has the advantages of low energy consumption, uniform and stable discharge and simple structure, can form interaction and synergistic effect with a catalyst, and is suitable for plasma catalysis under atmospheric pressure. The packed bed dielectric barrier discharge has high electric field intensity and electron energy, can generate more frequent electron impact ionization, excitation, decomposition and other plasma reactions, generates abundant charged particles, free radicals and excited state particles, and activates plasma catalysis with higher energy efficiency.
The dielectric barrier discharge plasma excited by the nanosecond pulse power supply has the advantages of high field intensity and low temperature, uniform discharge is easy to realize, and the plasma can be effectively adjusted by changing pulse parameters; the catalyst and the dielectric barrier discharge reactor are optimized by combining nanosecond pulse power supply excitation, and the reasonable regulation and control of the gas conversion rate and the energy efficiency of the ammonia synthesis catalyzed by the dielectric barrier discharge plasma can be realized.
The utility model discloses an among the embodiment, nitrogen gas hydrogen mist discharges through the microwave inside the resonant cavity and the dielectric barrier discharge reactor inside, discharges through the microwave, the dielectric barrier discharge reactor and the catalyst synergism, under the atmospheric pressure low temperature condition, realizes plasma catalytic synthesis ammonia.
In some embodiments, the microwave backflow prevention device comprises a circulator and a water load, and an inlet section and an outlet end of the circulator are respectively connected with a microwave power supply and a three-pin dispenser.
The microwave backflow preventer is used to isolate the reflected wave and avoid the reflected wave from damaging the microwave power supply.
The circulator is a device for unidirectional annular transmission of electromagnetic waves, and is a three-port device, the lower end of the circulator is connected with a water load through a flange, and the water load can adjust the water temperature through a cold water circulating pump.
The water load is a common high-power microwave matching load, can be divided into an absorption water load and a radiation water load according to the working mode, and both use flowing water as an absorber of microwaves. The water load can play the roles of backflow prevention and temperature reduction at the same time.
In some embodiments, the length of the microwave coaxial resonant cavity is generally set to an odd number of quarter wavelengths, the gas inlet end of the microwave coaxial resonant cavity is closed, the gas outlet end is open, that is, an opening is formed, the enhanced electric field can easily ionize the gas, and a plasma jet is formed at the opening of the gas outlet end.
In some embodiments, the dielectric barrier discharge reactor has a plate-plate electrode structure, and high voltage electrodes, namely a high voltage electrode and a low voltage electrode, are arranged on the upper inner side and the lower inner side of the dielectric barrier discharge reactor; the upper high-voltage electrode is connected with a nanosecond pulse power supply, and the lower high-voltage electrode is connected with a grounding electrode;
in some embodiments, the nitrogen source is a nitrogen cylinder and the hydrogen source is a hydrogen cylinder; the outlet pipelines of the nitrogen gas bottle and the hydrogen gas bottle are respectively provided with a pressure reducing valve 22, and the downstream of the pressure reducing valve is respectively provided with a flowmeter 23;
the nitrogen gas cylinder is filled with high-purity nitrogen gas, and the hydrogen gas cylinder is filled with high-purity hydrogen gas. The nitrogen and the hydrogen are respectively regulated in gas pressure and flow by a pressure reducing valve and a flow meter, and mixed gas of nitrogen and hydrogen is formed after premixing and enters the microwave coaxial resonant cavity.
In some embodiments, an air heater 25 and a current equalizer 26 are further disposed between the nitrogen source and the hydrogen source and the gas inlet of the microwave coaxial resonant cavity, the nitrogen source and the hydrogen source are connected to the air heater 25, and the air heater 25 is connected to the current equalizer 26 and the gas inlet of the microwave coaxial resonant cavity 8 in turn;
the air heater can change the temperature of the gas, and the nitrogen and the hydrogen are heated to a proper temperature according to the requirement of the ammonia synthesis by plasma catalysis, so that the efficiency of the ammonia synthesis by plasma catalysis is improved; the purpose of the flow equalizer is to mix nitrogen and hydrogen evenly.
In some embodiments, a thermocouple thermometer 24 is disposed in the air heater 25;
the thermocouple thermometer is a temperature measuring instrument based on a thermoelectric effect, detects a gas temperature using the thermocouple thermometer, and transmits the detected information to a computer to observe an appropriate gas temperature, and performs gas temperature adjustment by an air heater.
In some embodiments, the apparatus for synthesizing ammonia further comprises a thermal infrared imager 12, a gas chromatograph 13 and a vessel 14 containing sulfuric acid; the thermal infrared imager 12 is connected to a gas outlet of the dielectric barrier discharge reactor 9, and the thermal infrared imager 12 is sequentially connected with a gas chromatograph 13 and a container 14 filled with sulfuric acid;
the thermal infrared imager is used for acquiring temperature information of the surface of the catalyst in real time; the product obtained after ammonia is catalytically synthesized by the nitrogen and hydrogen plasmas enters a gas chromatograph, and the gas chromatograph detects the property of the product and transmits the detected result and data to a computer; a vessel containing a sulfuric acid solution was used to absorb the ammonia gas produced.
In some embodiments, the apparatus for synthesizing ammonia further comprises a rogowski coil 15, an oscilloscope 18 and a computer 19, wherein the rogowski coil 15 is positioned between the dielectric barrier discharge reactor 9 and the grounding electrode 16, the rogowski coil 16 is connected with the oscilloscope 18, one end of the oscilloscope 18 is connected with the gas chromatograph 13, and the other end of the oscilloscope 18 is connected with the computer 17;
the Rogowski coil is used for detecting a current signal, and the oscilloscope is used for displaying a current wave pattern.
The rogowski coil is also called a differential current sensor, and is a ring-shaped coil uniformly wound on a non-ferromagnetic material. The output signal is the current differential over time; the input current can be truly restored by a circuit which integrates the output voltage signal. An oscilloscope is an instrument used to measure the shape of an alternating current or pulsed current wave.
And (4) analyzing and processing the result and the data obtained by the detection of the gas chromatograph by the computer, and calculating to obtain the gas conversion rate.
In some embodiments, the dielectric barrier discharge reactor 9 is located within a tube furnace 17;
the tubular furnace is mainly used for heating the catalyst, the dielectric barrier discharge reactor filled with the catalyst is placed into the tubular furnace, and the temperature control of the surface of the catalyst is realized by arranging the tubular furnace for heating.
In one embodiment of the present invention, a method for synthesizing ammonia is provided, which comprises the following steps:
forming atmospheric nitrogen and hydrogen microwave discharge plasma at the opening of the microwave coaxial resonant cavity by using the mixed gas of nitrogen and hydrogen;
the generated atmospheric pressure nitrogen and hydrogen microwave discharge plasma and the plasma generated in the dielectric barrier discharge reactor act together, and the synthesis of ammonia is realized under the synergistic action of the catalyst in the dielectric barrier discharge reactor.
In some embodiments, the microwave power supply is a 2.45GHz microwave power supply;
in some embodiments, the catalyst is magnesium chloride, preferably, the catalyst is a spherical magnesium chloride catalyst;
magnesium chloride is introduced into the plasma for catalyzing and synthesizing ammonia as a catalyst which can reduce the activation energy of nitrogen and hydrogen and an absorbent which can absorb ammonia in situ. When magnesium chloride is used as the absorbent, a critical absorption intermediate compound Mg can be formed under plasma conditions3N2And Mg (NH)3)6Cl2Absorbing ammonia in situ; after the synthesis of the ammonia is finished,the catalyst in the reactor is taken out, the catalyst is placed in water and can generate ammonia gas after being dissolved, the catalyst is taken out of the water and dried, and then the catalyst is placed in the reactor again, so that the catalyst can be recycled, and the efficiency of synthesizing ammonia by using plasma catalysis is improved.
In some embodiments, the dielectric barrier discharge reactor is energized by a nanosecond pulsed power supply having a frequency of 0-15KHz, an output amplitude of 0-15KV, a pulse rise time and a pulse fall time of 50-500ns, to ionize gas inside the dielectric barrier discharge reactor to produce a discharge plasma.
In some embodiments, the surface temperature of the catalyst is 700K;
in some embodiments, the gas temperature is about 250 ℃;
in some embodiments, the flow rate of the gas is 90 mL/min.
In order to avoid the heat transfer phenomenon, the gas is enabled to rapidly pass through the discharge plasma reactor by increasing the flow velocity of the gas, so that the temperature of the surface of the gas and the temperature of the catalyst are separately controlled.
Example 1
As shown in fig. 1, an apparatus for synthesizing ammonia comprises:
the microwave anti-backflow device comprises a microwave power supply 1, a microwave anti-backflow device, a three-pin tuner 4, a microwave coaxial resonant cavity 8 and a dielectric barrier discharge reactor 9 which are connected in sequence;
the dielectric barrier discharge reactor 9 is connected with the nanosecond pulse power supply 11, and a catalyst 27 is filled in the dielectric barrier discharge reactor 9; the dielectric barrier discharge reactor 9 is positioned in the tube furnace 17;
the upper inner side and the lower inner side of the dielectric barrier discharge reactor 9 are provided with high voltage electrodes 10, the high voltage electrodes comprise an upper high voltage electrode and a lower high voltage electrode, and the catalyst 27 is filled in the high voltage electrodes; the upper high-voltage electrode is connected with the nanosecond pulse power supply 11, and the lower high-voltage electrode is connected with the grounding electrode 16;
the nitrogen source is a nitrogen gas cylinder, and the hydrogen source is a hydrogen gas cylinder; the outlet pipelines of the nitrogen gas bottle and the hydrogen gas bottle are respectively provided with a pressure reducing valve 22, and the downstream of the pressure reducing valve is respectively provided with a flowmeter 23;
an air heater 25 and a flow equalizer 26 are also arranged between the nitrogen gas cylinder and the hydrogen gas cylinder and the gas inlet of the microwave coaxial resonant cavity 8, the nitrogen gas cylinder and the hydrogen gas cylinder are respectively connected with the air heater 25 through pipelines, and the air heater 25 is sequentially connected with the flow equalizer 26 and the gas inlet of the microwave coaxial resonant cavity 8; a thermocouple thermometer 24 is arranged in the air heater 25;
the device for synthesizing ammonia further comprises a thermal infrared imager 12, a gas chromatograph 13 and a container 14 filled with sulfuric acid; the thermal infrared imager 12 is connected to a gas outlet of the dielectric barrier discharge reactor 9, and the thermal infrared imager 12 is sequentially connected with a gas chromatograph 13 and a container 14 filled with sulfuric acid;
the device for synthesizing ammonia further comprises a Rogowski coil, an oscilloscope and a computer, wherein the Rogowski coil is positioned between the dielectric barrier discharge reactor and the grounding electrode, the Rogowski coil is connected with the oscilloscope, one end of the oscilloscope is connected with the gas chromatograph, and the other end of the oscilloscope is connected with the computer.
Example 2
A method for synthesizing ammonia, comprising the steps of:
nitrogen and hydrogen in a volume ratio of 2: 1, heating the mixed gas to 250 ℃, equalizing the flow of the mixed gas, then feeding the heated mixed gas into a microwave coaxial resonant cavity, forming atmospheric-pressure nitrogen and hydrogen microwave discharge plasma at an opening of the microwave coaxial resonant cavity, feeding the sprayed microwave discharge plasma into a dielectric barrier discharge reactor, enabling the microwave discharge plasma and the plasma generated in the dielectric barrier discharge reactor to act together, and realizing the synthesis of ammonia under the action of a catalyst in the dielectric barrier discharge reactor;
the dielectric barrier discharge reactor is excited by a nanosecond pulse power supply, the frequency is 3KHz, the output amplitude is 14KV, and the pulse rising time and the pulse falling time are 100 ns;
the catalyst in the dielectric barrier discharge reactor is a spherical magnesium chloride catalyst, the surface temperature of the catalyst is 700K, and the flow rate of the mixed gas is 90 mL/min.
Gas outlet of the device for synthesizing ammonia by detectionNH at the mouth3The concentration reaches 17500 ppm.
Example 3
A method for synthesizing ammonia, comprising the steps of:
nitrogen and hydrogen in a volume ratio of 2: 1, heating the mixed gas to 250 ℃, equalizing the flow of the mixed gas, then feeding the heated mixed gas into a microwave coaxial resonant cavity, forming atmospheric-pressure nitrogen and hydrogen microwave discharge plasma at an opening of the microwave coaxial resonant cavity, feeding the sprayed microwave discharge plasma into a dielectric barrier discharge reactor, enabling the microwave discharge plasma and the plasma generated in the dielectric barrier discharge reactor to act together, and realizing the synthesis of ammonia under the action of a catalyst in the dielectric barrier discharge reactor;
the dielectric barrier discharge reactor is excited by a nanosecond pulse power supply, the frequency is 5KHz, the output amplitude is 10KV, and the pulse rising time and the pulse falling time are 150 ns;
the catalyst in the dielectric barrier discharge reactor is a spherical magnesium chloride catalyst, the surface temperature of the catalyst is 700K, and the flow rate of the mixed gas is 90 mL/min.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
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| CN112403416A (en) * | 2020-11-20 | 2021-02-26 | 山东师范大学 | Device and method for synthesizing ammonia |
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