CN111167331A - T-shaped mixer for supercritical hydrothermal synthesis technology - Google Patents

T-shaped mixer for supercritical hydrothermal synthesis technology Download PDF

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Publication number
CN111167331A
CN111167331A CN201911358450.7A CN201911358450A CN111167331A CN 111167331 A CN111167331 A CN 111167331A CN 201911358450 A CN201911358450 A CN 201911358450A CN 111167331 A CN111167331 A CN 111167331A
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pipe
main body
shaped main
body pipe
accelerator
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CN201911358450.7A
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CN111167331B (en
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王树众
杨健乔
王栋
杨闯
刘璐
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Xian Jiaotong University
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Xian Jiaotong University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/42Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90Heating or cooling systems
    • B01F35/92Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00Feed or outlet devices; Feed or outlet control devices
    • B01J4/001Feed or outlet devices as such, e.g. feeding tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90Heating or cooling systems
    • B01F2035/98Cooling

Abstract

The invention discloses a T-shaped mixer for supercritical hydrothermal synthesis technology, wherein a group of impinging jet orifice plates are symmetrically arranged in a horizontal pipe of a T-shaped main body pipe, and a venturi accelerator is arranged in a vertical pipe of the T-shaped main body pipe, so that the collision centers of two jets entering through the T-shaped main body pipe can be just positioned on the central line of the T-shaped main body pipe by adjusting the position of the impinging jet orifice plates, supercritical water and inorganic salt materials begin to move to the downstream of the T-shaped main body pipe after colliding, and fluid accelerated forced mixing is carried out through the venturi accelerator, so that uniform mixing is realized. Because the flow of two efflux after the adjustment is matchd, effectively prevented that the supercritical water from penetrating into the inorganic salt material pipeline of cold state, avoided the too high too early crystallization that leads to of inorganic salt preheating temperature to block up the pipeline, consequently can not cause the mixed material who gets into in the reactor connecting pipe to cause the phenomenon of local intensification, effectively avoided the blender to take place the crystallization and arouse the situation that the pipeline blockked up.

Description

T-shaped mixer for supercritical hydrothermal synthesis technology
Technical Field
The technical field of chemical engineering, in particular to a T-shaped mixer for supercritical hydrothermal synthesis technology.
Background
Nanotechnology has important strategic position in the industrial revolution of the 21 st century, and the rapid development of nanotechnology almost prompts revolutionary changes in all industrial fields, and is the most important and most promising leading-edge technology of the 21 st century. Compared with common powder, the nano material has excellent performance, such as large specific surface area, interface effect, quantum tunneling effect and the like, endows unique performance and specific electrical, thermal, magnetic, optical and mechanical properties, and is widely applied to various fields. The traditional preparation method of nano powder is divided into two main categories of physical method and chemical method. However, the traditional method has complex process equipment, low yield, difficulty in being below 100nm and high difficulty in large-scale production; generally, the subsequent treatment is carried out; meanwhile, organic solvents or highly toxic additive components can be added in some preparation methods, so that serious pollution is caused in production. The price of the nano material is quite high due to various problems faced by the traditional nano manufacturing method, for example, the price of nano copper with the size of about 50nm is about 300-400 ten thousand per ton, so that the large-scale application of the nano material is severely restricted, and the development of related industries is also restricted.
The supercritical hydrothermal synthesis technology is a green synthesis technology for preparing nano metal powder. The basic principle of the supercritical hydrothermal synthesis technology is that supercritical water is adopted as a reaction medium in a closed high-pressure container to form nano metal or metal oxide powder with extremely small particle size. The particles prepared in the supercritical hydrothermal synthesis process have the advantages of uniform particle size distribution, complete crystal grain development, high purity, light particle agglomeration, applicability to cheap raw materials, low operation cost compared with the traditional preparation method, and the technical advantages of preparing the nano metal particles by supercritical hydrothermal synthesis mainly comprise the following aspects:
1. the nucleation rate is extremely high, which is beneficial to the formation of ultrafine particles (10nm-30 nm).
2. The reaction rate is extremely fast, and is improved by several orders of magnitude compared with the conventional method.
3. The reaction space is closed, no secondary pollution is caused, and the environment is friendly.
However, in the process of popularizing and applying the supercritical hydrothermal synthesis technology, the following defects are found:
because the metal inorganic salt solution instantly finishes the precipitation process after reaching the supercritical state, generally, the duration of the generation reaction of the nano-scale metal/metal oxide particles is between 5 seconds and 10 seconds, and in order to enable the raw material (the metal inorganic salt solution) to quickly reach the reaction temperature in a short time, a mode of mixing large-flow high-temperature supercritical water and a cold-state inorganic salt solution is generally adopted for mixing. For example, supercritical water of 600 ℃ with a flow rate of 500L/h and inorganic salt solution of 20 ℃ with a flow rate of 300L/h are mixed, and after sufficient mixing and heat exchange, the overall temperature becomes 400 ℃, namely the target reaction temperature. Thus, how to achieve the rapid, sufficient and uniform mixing of supercritical water and material solution is the key to determine the quality of the product. It is currently common to mix two streams together using a mixer in the form of a T-tee. The disadvantages of this mixer are three:
1. in the process of mixing the inorganic salt solution and the supercritical water, because the flow of the inorganic salt solution and the supercritical water are not matched, the supercritical water can be mixed into a pipeline of the inorganic salt solution to cause local temperature rise, and even cause crystallization of high-concentration inorganic salt in the pipeline which does not enter a mixer, so that the pipeline is extremely easy to be blocked.
2. Because inorganic salt solution and supercritical water are all in great flow cross section, and the two are disturbed seriously after colliding, have formed temperature field and concentration field that temperature, velocity distribution are very uneven to caused some regional temperature to reach reaction temperature, some region does not reach, thereby the particle size that leads to forming is unstable, can't produce the product that quality is good.
3. There is not intensive mixing arrangement in the pipeline after the mixture, and supercritical water and material have just got into the reactor after not having passed through intensive mixing yet, cause whole mixing, reaction in-process to all not realize abundant mixing to be difficult to realize rapid heating up, homogeneous mixing, can't produce the low high-quality product of particle diameter.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a T-shaped mixer for supercritical hydrothermal synthesis technology, which effectively avoids the condition that the pipeline is blocked due to the crystallization of the mixer.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a T-shaped mixer for supercritical hydrothermal synthesis technology, which comprises a T-shaped main body pipe, wherein a group of colliding jet orifice plates are symmetrically arranged in a horizontal pipe of the T-shaped main body pipe, a Venturi accelerator is arranged in a vertical pipe of the T-shaped main body pipe, and a reactor connecting pipe is arranged below the Venturi accelerator;
the horizontal pipe one end of T type main part pipe is the supercritical water entry, and the other end is inorganic salt material entry, and two strands of efflux that get into respectively by above-mentioned two entrances are behind the collision jet orifice plate, and fluidic collision center is located the central line of T type main part pipe, and the fluid after the mixing flows into the reactor connecting pipe after the acceleration of venturi accelerator mixes.
Preferably, the wall surface of the impinging jet orifice plate is provided with a plurality of positioning holes, and the impinging jet orifice plate is fixed in the T-shaped main body pipe through fixing bolts.
Further preferably, the distance from the impinging jet orifice plate to the center of the T-shaped main body pipe is adjusted by adjusting the position at which the fixing bolt is inserted into the impinging jet orifice plate.
Preferably, a cooling jacket is arranged outside the pipe wall of the T-shaped main body pipe close to the inlet side of the inorganic salt material, and a cooling water inlet and a cooling water outlet are formed in the cooling jacket.
Further preferably, the cooling jacket is of an annular structure and is fixed on the outer wall of the T-shaped main body pipe in a welding mode.
Preferably, the surface of the impinging jet orifice plate is provided with small holes with uniform sizes.
Preferably, an accelerator bracket is further arranged at the outlet of the T-shaped main body pipe, and the outlet of the accelerator bracket is connected with the reactor connecting pipe.
Further preferably, the accelerator bracket is connected with the T-shaped main pipe through a bolt, and a distance between the accelerator bracket and the T-shaped main pipe is changed by adding a gasket between the accelerator bracket and the T-shaped main pipe.
Preferably, the venturi accelerator is fixed on the accelerator bracket by welding.
Preferably, the top end of the venturi accelerator is free to expand without being fixed.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a T-shaped mixer for supercritical hydrothermal synthesis technology, wherein a group of colliding jet orifice plates are symmetrically arranged in a horizontal pipe of a T-shaped main body pipe, and a Venturi accelerator is arranged in a vertical pipe of the T-shaped main body pipe, so that the collision centers of two jets entering through the T-shaped main body pipe can be just positioned on the central line of the T-shaped main body pipe by adjusting the position of the colliding jet orifice plates, supercritical water and inorganic salt materials begin to move to the downstream of the T-shaped main body pipe after colliding, and fluid is accelerated and intensively mixed through the Venturi accelerator, so that uniform mixing is realized. Because the flow of two efflux after the adjustment is matchd, effectively prevented that the supercritical water from penetrating into the inorganic salt material pipeline of cold state, avoided the too high too early crystallization that leads to of inorganic salt preheating temperature to block up the pipeline, consequently can not cause the mixed material who gets into in the reactor connecting pipe to cause the phenomenon of local intensification, effectively avoided the blender to take place the crystallization and arouse the situation that the pipeline blockked up.
Furthermore, the surface of the impinging jet orifice plate is provided with small holes with uniform sizes, and the fluid is divided into a plurality of jet flows by the small holes uniformly distributed on the orifice plate, so that the full mixing is favorably realized.
Further, be used for supporting the venturi accelerator and can adjust the accelerator support of the position of venturi accelerator through the setting, can realize that the degree of depth of just mixing the material strengthens mixing, effectively guarantees mixed effect, realizes intensive mixing, rapid heating up.
Furthermore, a cooling jacket is arranged outside the pipe wall of the T-shaped main body pipe close to the inlet side of the inorganic salt material, and a cooling water inlet and a cooling water outlet are formed in the cooling jacket, so that the inorganic salt material in a cold state can be effectively guaranteed not to be excessively preheated by supercritical water when not entering a collision area.
Drawings
FIG. 1 is a schematic structural diagram of a T-shaped mixer for supercritical hydrothermal synthesis of the present invention;
fig. 2 is a schematic illustration of the opening of an impinging jet orifice plate.
Wherein: 1 is T type main part pipe, 2 is fixing bolt, 3 is the clash jet orifice board, 4 is the cooling jacket, 5 is the venturi accelerator, 6 is the accelerator support, 7 is the reactor connecting pipe.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a T-type mixer for supercritical hydrothermal synthesis technology comprises a T-type main pipe 1, a fixing bolt 2, an impinging jet orifice plate 3, a cooling water jacket 4, a venturi accelerator 5, an accelerator support 6 and a reactor connecting pipe 7. The both ends of T type main part pipe 1 are equipped with and collide the injection orifice plate 3, and the inorganic salt material inlet side of T type main part pipe 1 has cooling jacket 4, and supercritical water and inorganic salt material penetrate through the both ends of T type blender back through venturi accelerator 5, and the export of T type main part pipe 1 links to each other with the entry of accelerator support 6, and the export of accelerator support links to each other with reactor connecting pipe 7.
The cooling jacket 4 is of an annular structure and is fixed on the outer side of the T-shaped main body pipe 1 in a welding mode, and a cooling water inlet N3 and a cooling water outlet N4 are arranged on the jacket.
The edge wall surface of the collision jet orifice plate 3 is provided with a plurality of fixing holes and is fixed in the T-shaped main body pipe 1 through fixing bolts 2. The distance from the impinging jet orifice plate 3 to the center of the T-shaped main body pipe 1 is adjusted by adjusting the position of the bolt 2 entering the impinging jet orifice plate 3.
The venturi accelerator 5 is fixed on the accelerator bracket 6 in a welding mode, and the top end of the venturi accelerator 5 is not fixed and can be freely expanded.
The accelerator bracket 6 is connected with the T-shaped main body pipe 1 in a bolt connection mode, and the distance between the accelerator bracket and the T-shaped main body pipe 1 is changed by adding gaskets with different thicknesses between the accelerator bracket and the T-shaped main body pipe 1, so that the distance between the Venturi accelerator 5 and the T-shaped main body pipe 1 is changed.
Referring to fig. 2, the surface of the impinging jet orifice plate 3 is provided with small holes of uniform size.
The method for mixing by using the T-shaped mixer for supercritical hydrothermal synthesis technology comprises the following processes:
1. supercritical water enters from an N1 port at one end of the horizontal pipe of the T-shaped main body pipe 1, and inorganic salt materials enter from an N2 port at the other end of the horizontal pipe of the T-shaped main body pipe 1.
The positions of the two colliding jet orifice plates 3 are determined by a theoretical calculation and experiment method, so that the collision centers of the two jets are just positioned on the central line of the T-shaped main body pipe 1 under the conditions of supercritical water and materials with specific flow.
2. The supercritical water and the inorganic salt material begin to move to the downstream of the T-shaped main body pipe 1 after colliding, and the fluid is accelerated and intensively mixed by the Venturi accelerator 5, so that uniform mixing is realized.
In the process, the optimum position of the venturi accelerator 5 is determined by theoretical calculation and experimental methods.
3. In the working process of the mixer, cooling water with a certain flow rate is arranged in the cooling water jacket 4, enters from one side close to the central line of the T-shaped main body pipe 1 and is discharged from the other side.
4. The mixed fluid exits the mixer from the rear end of the venturi accelerator 5 into the subsequent reactor connecting tube 7.
In conclusion, the T-shaped mixer for supercritical hydrothermal synthesis technology disclosed by the invention realizes the optimal mixing effect by adjusting the positions of key parts in the mixer. Through setting up the impinging jet orifice plate and adjusting the position of impinging jet orifice plate, the fluid is cut apart into the stranded efflux by the aperture of evenly distributed on the orifice plate, realizes intensive mixing. Through setting up the venturi accelerator and adjusting the position of venturi accelerator, realize the degree of depth intensive mixing of just mixing the material, effectively guarantee mixed effect. Through setting up cooling jacket, effectively guarantee that cold inorganic salt material is not excessively preheated by supercritical water when not getting into collision area. Therefore, the device can realize the sufficient mixing and the rapid heating of the supercritical water and the inorganic salt solution in the mixer.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (10)

1. A T-shaped mixer for supercritical hydrothermal synthesis technology is characterized by comprising a T-shaped main body pipe (1), wherein a group of colliding jet orifice plates (3) are symmetrically arranged in a horizontal pipe of the T-shaped main body pipe (1), a Venturi accelerator (5) is arranged in a vertical pipe of the T-shaped main body pipe (1), and a reactor connecting pipe (7) is arranged below the Venturi accelerator (5);
one end of a horizontal pipe of the T-shaped main body pipe (1) is a supercritical water inlet (N1), the other end of the horizontal pipe is an inorganic salt material inlet (N2), two jets entering from the two inlets respectively collide with the injection pore plate (3), the collision center of the fluid is positioned on the central line of the T-shaped main body pipe (1), and the mixed fluid is accelerated and mixed by the Venturi accelerator (5) and then flows into the reactor connecting pipe (7).
2. The T-shaped mixer for supercritical hydrothermal synthesis technology of claim 1, wherein the wall surface of the impinging jet orifice plate (3) is provided with a plurality of positioning holes, and the impinging jet orifice plate (3) is fixed in the T-shaped main body pipe (1) through fixing bolts (2).
3. The T-type mixer for supercritical hydrothermal synthesis technology of claim 2, characterized in that the distance from the impinging jet orifice plate (3) to the center of the T-type main body pipe (1) is adjusted by adjusting the position of inserting the fixing bolt (2) into the impinging jet orifice plate (3).
4. The T-shaped mixer for supercritical hydrothermal synthesis technology of claim 1, wherein the pipe wall of the T-shaped main pipe (1) near the inorganic salt material inlet side is externally provided with a cooling jacket (4), and the cooling jacket (4) is provided with a cooling water inlet and a cooling water outlet.
5. The T-shaped mixer for supercritical hydrothermal synthesis technology of claim 4 characterized in that the cooling jacket (4) is of annular structure and is fixed on the outer wall of the T-shaped main tube (1) by welding.
6. The T-shaped mixer for supercritical hydrothermal synthesis technology of claim 1, characterized in that the surface of the impinging jet orifice plate (3) is provided with small holes of uniform size.
7. The T-shaped mixer for supercritical hydrothermal synthesis technology of any one of claims 1-6, characterized in that an accelerator support (6) is further provided at the outlet of the T-shaped main pipe (1), and the outlet of the accelerator support (6) is connected with the reactor connecting pipe (7).
8. The T-shaped mixer for supercritical hydrothermal synthesis technology of claim 7, characterized in that the accelerator bracket (6) is connected with the T-shaped main body pipe (1) through bolts, and the distance between the accelerator bracket (6) and the T-shaped main body pipe (1) is changed by adding a gasket between the accelerator bracket (6) and the T-shaped main body pipe (1).
9. The T-shaped mixer for supercritical hydrothermal synthesis technology according to any one of claims 1 to 6, characterized in that the Venturi accelerator (5) is fixed on the accelerator bracket (6) by welding.
10. The T-shaped mixer for supercritical hydrothermal synthesis technology according to any one of claims 1-6, characterized in that the top end of the Venturi accelerator (5) can expand freely without fixation.
CN201911358450.7A 2019-12-25 2019-12-25 T-shaped mixer for supercritical hydrothermal synthesis technology Active CN111167331B (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN111761072A (en) * 2020-07-01 2020-10-13 西安交通大学 Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder
CN111781229A (en) * 2020-07-06 2020-10-16 西安交通大学 Multifunctional inorganic salt crystallization-deposition comprehensive testing device
CN111773993A (en) * 2020-07-01 2020-10-16 西安交通大学 Counter-flow jet cold and hot fluid mixer under action of external field
CN113967452A (en) * 2021-10-22 2022-01-25 西安交通大学 Assembled supercritical hydrothermal synthesis platform suitable for various nano-powder
CN114653331A (en) * 2022-04-07 2022-06-24 西安交通大学 Integrated mixing-reaction-cooling device for supercritical hydrothermal synthesis
CN114711138A (en) * 2021-04-02 2022-07-08 农纷集信息科技(江苏)有限公司 Preparation and application method of product for improving pollination rate of crops to achieve improvement of grouting rate

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CN111761072A (en) * 2020-07-01 2020-10-13 西安交通大学 Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder
CN111773993A (en) * 2020-07-01 2020-10-16 西安交通大学 Counter-flow jet cold and hot fluid mixer under action of external field
CN111773993B (en) * 2020-07-01 2021-10-19 西安交通大学 Counter-flow jet cold and hot fluid mixer under action of external field
CN111761072B (en) * 2020-07-01 2021-11-09 西安交通大学 Multi-section jet flow efficient mixing device and method for supercritical hydrothermal synthesis of nano metal powder
CN111781229A (en) * 2020-07-06 2020-10-16 西安交通大学 Multifunctional inorganic salt crystallization-deposition comprehensive testing device
CN111781229B (en) * 2020-07-06 2021-05-28 西安交通大学 Multifunctional inorganic salt crystallization-deposition comprehensive testing device
CN114711138A (en) * 2021-04-02 2022-07-08 农纷集信息科技(江苏)有限公司 Preparation and application method of product for improving pollination rate of crops to achieve improvement of grouting rate
CN113967452A (en) * 2021-10-22 2022-01-25 西安交通大学 Assembled supercritical hydrothermal synthesis platform suitable for various nano-powder
CN113967452B (en) * 2021-10-22 2022-12-09 西安交通大学 Assembled supercritical hydrothermal synthesis platform suitable for various nano-powder
CN114653331A (en) * 2022-04-07 2022-06-24 西安交通大学 Integrated mixing-reaction-cooling device for supercritical hydrothermal synthesis
CN114653331B (en) * 2022-04-07 2022-11-25 西安交通大学 Integrated mixing-reaction-cooling device for supercritical hydrothermal synthesis

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