CN113401868B - Device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing atmospheric pressure microwave plasma torch - Google Patents
Device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing atmospheric pressure microwave plasma torch Download PDFInfo
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- CN113401868B CN113401868B CN202110889923.7A CN202110889923A CN113401868B CN 113401868 B CN113401868 B CN 113401868B CN 202110889923 A CN202110889923 A CN 202110889923A CN 113401868 B CN113401868 B CN 113401868B
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0495—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by dissociation of hydrogen sulfide into the elements
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0266—Processes for making hydrogen or synthesis gas containing a decomposition step
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
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Abstract
A device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing an atmospheric pressure microwave plasma torch belongs to the technical field of new energy. Comprises an atmospheric pressure microwave plasma generator, a chemical reaction buffer chamber and a decomposition product collecting device. The hydrogen sulfide gas is mixed into the plasma carrier gas and flows through a discharge tube of the atmospheric pressure microwave plasma generator in a vortex airflow mode; the discharge tube of the atmospheric pressure microwave plasma generator extends into a chemical reaction buffer chamber connected with the discharge tube, and the generated plasma is sprayed into the chemical reaction buffer chamber with a cooling function; the gas discharged from the other end of the chemical reaction buffer chamber passes through the decomposition product collecting device. The invention adopts the atmospheric pressure microwave plasma torch to decompose the hydrogen sulfide to prepare the hydrogen and the sulfur, and can effectively inhibit the reverse composite reaction of decomposed reactants by directly extracting and cooling the plasma jet flow, thereby remarkably improving H 2 The conversion rate of S and the yield of hydrogen are further improved compared with the traditional method in the aspect of hydrogen production efficiency.
Description
Technical Field
The invention belongs to the technical field of new energy, relates to a technology for recycling tail gas discharged by industry to produce hydrogen and solid sulfur, and in particular relates to a device for preparing sulfur and hydrogen by decomposing hydrogen sulfide by an atmospheric pressure microwave plasma torch.
Background
With the progress of technology, hydrogen is gradually becoming a fuel for new technologies, and the demand for hydrogen is increasing. However, the production of hydrogen is also mainly dependent on steam reforming of natural gas on a global scale, and new methods for producing hydrogen are urgently needed to meet the market demands. Therefore, hydrogen sulfide is directly decomposed to prepare hydrogen and sulfur, which not only meets the current hydrogen energy development requirement, but also solves the pollution problem caused by industrial discharged hydrogen sulfide, and the direct decomposition of hydrogen sulfide by various methods is a currently focused hot spot. The methods currently adopted according to the relevant reports are mainly as follows: thermal decomposition (direct thermal decomposition, catalytic thermal decomposition, super-adiabatic decomposition), electrochemical decomposition, photocatalytic decomposition, plasma method, etc. Since the thermal decomposition of hydrogen sulfide is limited by thermodynamic equilibrium, the conversion is low even at high temperatures; electrochemical methods and photocatalytic methods suffer from low efficiency, complex structures, and the like. Compared with the above-mentioned method, the plasma method has the advantages of quick response, high energy efficiency and wide adjustable range of gas flow and composition components, and meets the requirement of decomposing hydrogen sulfide under various production conditions. At present, various discharge methods, such as corona discharge, glow discharge, dielectric barrier discharge, sliding arc discharge, radio frequency plasma, microwave plasma and the like, have been practically applied in the application of preparing hydrogen and sulfur by decomposing hydrogen sulfide, and with the development of microwave technology in recent years, microwave plasma treatment technology at atmospheric pressure attracts industrial importance. The atmospheric pressure microwave plasma has high energy conversion efficiency and high electron and active particle density, and is a discharge form capable of maintaining a stable discharge state under the atmospheric pressure condition; in addition, the flow of the working gas of the atmospheric pressure microwave plasma torch is large, so that the experimental device can be amplified to the actual working condition of industrial application; also, the operating and maintenance costs of an atmospheric pressure microwave plasma torch are relatively low. For example, dong Yongzhi et al, in the solar school report, "microwave plasma method for decomposing H2S to produce hydrogen" (volume 18, 2 nd, 4 th 1997), propose a method for directly decomposing H2S to produce hydrogen by using microwave plasma.
The invention adopts the atmospheric pressure microwave plasma torch to decompose the hydrogen sulfide to prepare the hydrogen and the sulfur, and effectively inhibits the reverse composite reaction of decomposition reactants by a method of directly extracting and cooling the plasma jet flow, thereby greatly improving the conversion rate. The conversion effects of hydrogen production and sulfur obtained by different cooling modes are greatly different, and the invention provides a method for directly cooling afterglow in a reaction buffer chamber, which is different from the traditional cooling mode of the wall of a chemical reaction chamber in the reported research (university of Chinese university of warrior, authors Xu Yao, 2013, 4 months) on decomposing hydrogen sulfide gas by atmospheric pressure microwave plasma jet, so that the conversion rate of hydrogen sulfide decomposition hydrogen production is obviously improved under the conditions of atmospheric flow (tens of liters per minute) and more similar working conditions (adopting nitrogen as diluent gas).
Disclosure of Invention
The present invention has been made in view of the above problems, and provides a method of directly cooling the afterglow region in a reaction buffer chamber by decomposing H using an atmospheric pressure microwave plasma torch 2 S gas is used for preparing hydrogen and sulfur.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the device mainly comprises an atmospheric pressure microwave plasma generator 1, a chemical reaction buffer chamber 2 and a decomposition product collecting device 3. The hydrogen sulfide gas is mixed into the plasma carrier gas and flows through the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 in a swirling flow; the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 extends into the chemical reaction buffer chamber 2 connected with the discharge tube, and the generated plasma is sprayed into the chemical reaction buffer chamber 2 with a cooling function; the gas discharged from the other end of the chemical reaction buffer chamber 2 passes through the decomposition product collecting apparatus 3. The method comprises the following steps:
the atmospheric pressure microwave plasma generator 1 adopts a double-cavity excited atmospheric pressure microwave plasma torch proposed by a patent CN207070436U, and the specific structure and the working principle of the double-cavity excited atmospheric pressure microwave plasma torch are referred to in the patent. The atmospheric pressure microwave plasma generator 1 comprises a waveguide flange interface 11, a discharge tube 212, a microwave plasma coupling waveguide tube 12 and a working gas injection unit 13, wherein the microwave plasma coupling waveguide tube 12 is arranged at the bottom of a quartz glass tube 21 through the waveguide flange interface 11, the discharge tube 212 penetrates into the chemical reaction buffer chamber 2 from the bottom of the quartz glass tube 21, and the working gas injection unit 13 is arranged below the microwave plasma coupling waveguide tube 12. The atmospheric pressure microwave plasma generator 1 is communicated with a gas mixing container 43, and the gas mixing container 43 is respectively communicated with a first working gas 411 and a second working gas 422 through a first gas flow controller 41 and a second gas flow controller 42.
The chemical reaction buffer chamber 2 is composed of a quartz glass tube 21 coaxial with the discharge tube 212 and a metal net or a metal cylinder 22 sleeved on the outer wall of the quartz tube, wherein the inner tube is the discharge tube 212, and the quartz glass tube is the outer tube 21. One end of the quartz glass tube 21 is vertically fixed on the flange interface 11 of the microwave plasma coupling waveguide tube 12 of the atmospheric pressure microwave plasma generator 1 through a clamping groove, so that the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 penetrates into the chemical reaction buffer chamber 2 to a certain depth, and the carrier gas of plasma discharge flows through the plasma discharge tube 212 in a vortex airflow mode; a cylindrical cooling rod 23 is inserted from the other end of the quartz glass tube 21 along the axially inner portion of the chemical reaction buffer chamber 2 until the end face of the cooling rod 23 is spaced from the port of the discharge tube 212 by a length 1 to 3 times the outer diameter of the discharge tube 212, and this end face of the quartz glass tube 21 is connected to a gas discharge tube 25 through a connecting flange 24, and the discharge tube 25 is connected to the decomposition product collecting apparatus 3. The cooling rod 23 is a hollow metal pipe made of metal, and cooling water flows in the metal pipe through a water inlet pipe and a water outlet pipe which are communicated with the hollow metal pipe (the water inlet pipe is a thin metal pipe extending into the hollow metal pipe of the cooling rod 23, and the water outlet pipe is an outlet for leading out water injected into the cooling rod 23 after flowing in the cooling rod 23), so that the cooling water effectively cools the whole cooling rod 23 when flowing in the cooling rod 23. The water outlet pipe and the water inlet pipe of the cooling rod 23 are led out of the chemical reaction buffer chamber 2 through the sealing port on the connecting flange 24.
The decomposition product collecting apparatus 3 includes a filter bag 31, an alkaline solution tank 32, a drying agent-filled pipe 33, and a gas separating apparatus 34, which are sequentially connected. The gas decomposed and exhausted from the chemical reaction buffer chamber 2 is connected to a filter bag 31 of the decomposition product collecting device 3 through a gas exhaust pipe 25, solid powdered sulfur in the gas is recovered through the filter bag 31, unreacted hydrogen sulfide is absorbed through a basic solution tank 32 of the next stage, water vapor in the gas is absorbed through a pipeline 33 filled with a drying agent, and finally hydrogen components in the gas are separated out and stored for standby through a gas separating device 34.
The first working gas 411 and the second working gas 422 which are introduced into the atmospheric pressure microwave plasma generator 1 are respectively connected to the inlet of the gas mixing container 43 through the first gas flow controller 41 and the second gas flow controller 42, the outlet of the gas mixing container 43 is connected with the air inlet of the working gas injection unit 13 of the atmospheric pressure microwave plasma generator 1, the air outlet end of the working gas injection unit 13 is connected with the air inlet end of the discharge tube 212, and finally the mixed gas of the first working gas 411 and the second working gas 422 enters the discharge tube 212 in a vortex airflow mode through the gas injection unit 13, plasma discharge is excited in the discharge tube 212 under the excitation of microwaves, and a plasma discharge state is maintained with a certain input power. The plasma torch, which is outwardly sprayed, is formed at the outlet end of the discharge tube 212 by the mixed flowing gas of the first working gas 411 and the second working gas 422, thereby introducing the swirling gas flow into the chemical reaction buffer chamber 2.
Further, the first working gas 411 is H 2 S gas or H 2 S is mixed with other gases; the second working gas 422 is a plasma carrier gas (the plasma carrier gas may be nitrogen or argon or a mixed gas of both, and a hydrogen sulfide gas is mixed into the carrier gas and flows through the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 in a swirling flow manner); the first gas flow controller 41 and the second gas flow controller 42 are used to adjust the flow rates of the first working gas 411 and the second working gas 422 and the ratio of the two respectively.
Further, the diameter of the outer tube 21 is 2-4 times that of the discharge tube 212, and the length is more than 3 self tube diameters.
Further, the shape of the end surface of the cooling rod 23 opposite to the discharge tube 212 is a plane, a semicircle, a semi-ellipse, or a cone.
Further, the diameter of the cooling rod 23 is 0.6-2 times that of the plasma discharge tube 212.
Further, the microwave frequency adopted by the discharge of the microwave plasma generator 1 is 2.45GHz or 915MHz industrial frequency. The microwave frequency of the atmospheric pressure microwave plasma generator 1 is 2.45GHz, the adopted waveguide is a rectangular waveguide, the value interval of the inner diameter of the plasma discharge tube 212 is 1.6-2.6cm when the adopted waveguide model is WR340, and the value interval of the inner diameter of the plasma discharge tube 212 is 2.6-4.6cm when the adopted waveguide model is WR 430. The microwave frequency of the atmospheric pressure microwave plasma generator 1 can also be 915MHz, the corresponding adopted waveguide is rectangular waveguide, the type of the waveguide is WR975 plasma discharge tube 212, and the value of the inner diameter is in the range of 7.6-8.6 cm.
The invention has the beneficial effects that: the invention adopts the atmospheric pressure microwave plasma torch to decompose the hydrogen sulfide to prepare the hydrogen and the sulfur, and effectively inhibits the reverse composite reaction of decomposition reactants by the method of directly extracting and cooling the plasma jet flow, thereby being capable of obviously improving H 2 The conversion rate of S and the yield of hydrogen are further improved compared with the traditional method in the aspect of hydrogen production efficiency.
Drawings
Fig. 1 is a system block diagram of an apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide using an atmospheric pressure microwave plasma torch.
Fig. 2 is a schematic structural view of a chemical reaction buffer chamber in an apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide using an atmospheric pressure microwave plasma torch.
In the figure: 1 an atmospheric pressure microwave plasma generator; 2 a chemical reaction buffer chamber; 3 a decomposition product collecting device;
11 waveguide flange interface; 212 discharge tubes; 12 microwave plasma coupled waveguide; 13 a working gas injection unit; a 21 quartz glass tube; 22 a metal mesh or metal cylinder; 23 cooling bars; 24, connecting flanges; 25 gas discharge pipes; 31 a filter bag; 32 alkaline solution tanks; 33 a line containing a desiccant; 34 a gas separation device; 41 a first gas flow controller; a second gas flow controller 42; 43 a gas mixing vessel; 411 a first working gas; 422 a second working gas.
Detailed Description
The invention is further described below in connection with specific embodiments.
The device mainly comprises an atmospheric pressure microwave plasma generator 1, a chemical reaction buffer chamber 2 and a decomposition product collecting device 3. The plasma carrier gas can be nitrogen or argon or a mixed gas of the nitrogen and the argon, and the hydrogen sulfide gas is mixed into the carrier gas and flows through the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 in a vortex airflow mode; the discharge tube 212 of the atmospheric pressure microwave plasma generator 1 extends into the chemical reaction buffer chamber 2 connected with the discharge tube, and the generated plasma is sprayed into the chemical reaction buffer chamber 2 with a cooling function; the gas discharged from the other end of the chemical reaction buffer chamber 2 passes through the decomposition product collecting apparatus 3.
The atmospheric pressure microwave plasma generator 1 is mainly responsible for generating plasma discharge in the discharge tube 212 by the first and second working gases 411 and 412 under atmospheric pressure, maintaining a stable plasma discharge state under the coupling of microwave power, and forming a plasma torch downstream of the discharge tube 212 of the microwave plasma coupling waveguide 12 under the driving of flowing gas.
The atmospheric pressure microwave plasma generator 1 (the specific structure and working principle of which refer to a dual-cavity excited atmospheric pressure microwave plasma torch proposed by patent CN 207070436U) mainly comprises a microwave power supply, a magnetron, a circulator, a directional coupler, a microwave plasma coupling waveguide 12, a discharge tube 212 and a working gas injection unit 13. The microwave power supply adjusts the microwave power output by the magnetron by setting the working parameters, the microwaves generated by the magnetron are unidirectionally transmitted to the directional coupler through the circulator, and finally the energy is injected into the discharge tube 212 of the microwave plasma coupling waveguide 12, and the first working gas 411 can be stored H 2 The S gas and the second working gas 422 are mixed by the first and second gas flow controllers 41 and 42 in a proportion of 10% of hydrogen sulfide in the gas, and the total flow rate of the gas is set to 15 l/min, and the working gas is injected into the discharge tube 212 from the discharge tube 212 at the upstream inlet in a swirling flow manner by the working gas injection unit 13.
In specific use, the second working gas 422 is injected into the discharge tube 212 of the microwave plasma generator 1 by the working gas injection unit 13, then the microwave power supply is turned on for ignition, and the output power is regulated by the control panel of the microwave power supply. The microwave generated by the magnetron is transmitted to the directional coupler through the circulator and finallyEnergy is injected into the microwave plasma coupling waveguide 12 through the section gradient waveguide, so that the second working gas 422 is used for carrying gas to excite plasma discharge in the discharge tube 212, a plasma discharge state is maintained under the coupling input of microwave power, a plasma torch is formed at the downstream of the discharge tube 212 under the driving of flowing gas flow, and after the discharge is stable, the first gas flow controller 41 is opened to introduce the first working gas 411. Adjusting the first gas flow controller to vary the H mixed into the carrier gas 2 S ratio, H is performed under the working condition of stable atmospheric pressure microwave plasma discharge 2 S decomposition and hydrogen and sulfur production. The tail gas discharged from the chemical reaction buffer chamber 2 is connected to the decomposition product collecting device 3 through a discharge pipe 25, solid powder sulfur in the tail gas is recovered through a filter bag 31 in the tail gas, unreacted hydrogen sulfide is absorbed by a basic solution tank 32, water vapor in the gas is absorbed by a drying agent 33, and finally hydrogen components in the tail gas are separated and stored for standby by a gas separating device 34.
The examples described above represent only embodiments of the invention and are not to be understood as limiting the scope of the patent of the invention, it being pointed out that several variants and modifications may be made by those skilled in the art without departing from the concept of the invention, which fall within the scope of protection of the invention.
Claims (9)
1. The device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing an atmospheric pressure microwave plasma torch is characterized by comprising an atmospheric pressure microwave plasma generator (1), a chemical reaction buffer chamber (2) and a decomposition product collecting device (3);
the atmospheric pressure microwave plasma generator (1) comprises a waveguide tube flange interface (11), a discharge tube (212), a microwave plasma coupling waveguide tube (12) and a working gas injection unit (13); the microwave plasma coupling waveguide tube (12) is arranged at the bottom of the quartz glass tube (21) through the waveguide tube flange interface (11), the discharge tube (212) extends into the chemical reaction buffer chamber (2) from the bottom of the quartz glass tube (21), and the working gas injection unit (13) is arranged below the microwave plasma coupling waveguide tube (12); the atmospheric pressure microwave plasma generator (1) is communicated with the gas mixing container (43), and the gas mixing container (43) is respectively communicated with the first working gas (411) and the second working gas (422) through the first gas flow controller (41) and the second gas flow controller (42);
the chemical reaction buffer chamber (2) consists of a quartz glass tube (21) coaxial with the discharge tube (212) and a metal net or a metal cylinder (22) sleeved on the outer wall of the quartz tube, wherein the inner tube is the discharge tube (212), and the quartz glass tube is the outer tube (21); one end of the quartz glass tube (21) is connected with a flange interface (11) of the microwave plasma coupling waveguide tube (12) to enable the discharge tube (212) to extend into the chemical reaction buffer chamber (2), and carrier gas of plasma discharge flows through the plasma discharge tube (212) in a vortex airflow mode; a cylindrical cooling rod (23) is inserted from the other end of the quartz glass tube (21) along the axial inner part of the chemical reaction buffer chamber (2), and the end surface of the cooling rod (23) is communicated with the decomposition product collecting device (3) through a gas discharge tube (25);
the decomposition product collecting device (3) comprises a filter bag (31), an alkaline solution tank (32), a pipeline (33) filled with a drying agent and a gas separating device (34) which are connected in sequence; the gas after decomposition and discharge from the chemical reaction buffer chamber (2) is connected to a filter bag (31) of a decomposition product collecting device (3) through a gas discharge pipe (25), solid powder sulfur in the gas is recovered through the filter bag (31), unreacted hydrogen sulfide is absorbed through an alkaline solution tank (32) at the next stage, the gas passes through a pipeline (33) filled with a drying agent, and finally, hydrogen components in the gas are separated out through a gas separating device (34) and are stored for standby;
the first working gas (411) and the second working gas (422) which are introduced into the atmospheric pressure microwave plasma generator (1) are respectively connected to the inlet of the gas mixing container (43) through the first gas flow controller (41) and the second gas flow controller (42), the outlet of the gas mixing container (43) is connected with the air inlet of the working gas injection unit (13) of the atmospheric pressure microwave plasma generator (1), the air outlet end of the working gas injection unit (13) is connected with the air inlet end of the discharge tube (212), and finally the mixed gas of the first working gas (411) and the second working gas (422) enters the discharge tube (212) through the gas injection unit (13) in a vortex airflow mode, and plasma discharge is excited in the discharge tube (212) under the excitation of microwaves, and the plasma discharge state is maintained; and a plasma torch which is sprayed outwards is formed at the outlet end of the discharge tube (212) under the drive of mixed flowing gas of the first working gas (411) and the second working gas (422), and vortex airflow is introduced into the chemical reaction buffer chamber (2).
2. The apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide with an atmospheric pressure microwave plasma torch as claimed in claim 1, wherein said first working gas (411) is H 2 S gas or H 2 S and other gases, and a second working gas (422) are carrier gases.
3. The device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing an atmospheric pressure microwave plasma torch according to claim 1, wherein the microwave frequency of the atmospheric pressure microwave plasma generator (1) is 2.45GHz, and the adopted waveguide is a rectangular waveguide; the internal diameter of the plasma discharge tube (212) is 1.6-2.6cm when the type of the waveguide is WR340, and the internal diameter of the plasma discharge tube (212) is 2.6-4.6cm when the type of the waveguide is WR 430.
4. The device for preparing hydrogen and sulfur by decomposing hydrogen sulfide by utilizing an atmospheric pressure microwave plasma torch according to claim 1, wherein the microwave frequency of the atmospheric pressure microwave plasma generator (1) is 915MHz, and the adopted waveguide is a rectangular waveguide; the type of the waveguide tube is that the internal diameter of the WR975 plasma discharge tube (212) takes a value in the range of 7.6-8.6 cm.
5. The apparatus for preparing hydrogen and sulfur by decomposing hydrogen sulfide with an atmospheric pressure microwave plasma torch according to claim 1, wherein the diameter of the outer tube (21) is 2-4 times the diameter of the discharge tube (212), and the length is 3 own tube diameters or more.
6. The apparatus for preparing hydrogen and sulfur by decomposing hydrogen sulfide with an atmospheric pressure microwave plasma torch according to claim 1, wherein the cooling rod (23) is a hollow metal pipe of a metal material, and cooling water flows in the metal pipe through a water inlet pipe and a water outlet pipe communicated with the hollow metal pipe to cool the cooling rod (23).
7. The apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide by means of an atmospheric pressure microwave plasma torch according to claim 1, wherein the diameter of said cooling rod (23) is 0.6 to 2 times the diameter of the plasma discharge tube (212).
8. The apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide by means of an atmospheric pressure microwave plasma torch according to claim 1, wherein the distance from the end surface of the cooling rod (23) to the port of the discharge tube (212) is 1 to 3 times the length of the outer diameter of the discharge tube (212).
9. The apparatus for producing hydrogen and sulfur by decomposing hydrogen sulfide by means of an atmospheric pressure microwave plasma torch according to claim 1, wherein the end surface of said cooling rod (23) opposite to the discharge tube (212) has a planar, semicircular, semi-elliptical, or tapered shape.
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| US20050163696A1 (en) * | 2004-01-28 | 2005-07-28 | Uhm Han S. | Synthesis of carbon nanotubes by making use of microwave plasma torch |
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2021
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| WO2005082778A1 (en) * | 2004-03-01 | 2005-09-09 | H2S Technologies Inc. | Process and apparatus for converting hydrogen sulfide into hydrogen and sulfur |
| CN1946632A (en) * | 2004-03-01 | 2007-04-11 | H2S技术公司 | Process and apparatus for converting hydrogen sulfide into hydrogen and sulfur |
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