CN111632565A - Micro-channel rapid cooling device for preparing nano powder by supercritical hydrothermal synthesis technology - Google Patents
Micro-channel rapid cooling device for preparing nano powder by supercritical hydrothermal synthesis technology Download PDFInfo
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- CN111632565A CN111632565A CN202010445444.1A CN202010445444A CN111632565A CN 111632565 A CN111632565 A CN 111632565A CN 202010445444 A CN202010445444 A CN 202010445444A CN 111632565 A CN111632565 A CN 111632565A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0093—Microreactors, e.g. miniaturised or microfabricated reactors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2009/0086—Processes or apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
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Abstract
A micro-channel rapid cooling device for preparing nano powder by a supercritical hydrothermal synthesis technology comprises a flow dividing top cover, a heat exchange shell and a bottom cover which are distributed from top to bottom, wherein a cold fluid II, an outlet, a hot fluid inlet and a hot fluid outlet cavity are arranged on the flow dividing top cover; an external thread sleeve is arranged on the inner wall of the heat exchange shell, the external thread sleeve is tightly nested with the external thread substrate, a cold fluid thread channel and a hot fluid thread channel are respectively formed between the heat exchange shell and the external thread sleeve and between the external thread sleeve and the external thread substrate, and a plurality of cold fluid straight channels are distributed in the external thread substrate; a first cold fluid inlet, a second cold fluid inlet, a hot fluid outlet and an inlet cavity are formed in the bottom cover; the invention has the functions of realizing rapid cooling and preventing nano-particle agglomeration, can improve the stability and economy of a supercritical hydrothermal synthesis nano-material system, effectively solves the problem of agglomeration prevention of the SCHS technology, and accelerates the industrialization process of the SCHS technology.
Description
Technical Field
The invention relates to a cooler in the technical fields of energy, chemical industry, environmental protection, synthetic materials and the like, in particular to a micro-channel rapid cooling device for preparing nano-powder by a supercritical hydrothermal synthesis technology.
Background
Supercritical Water (SCW) is a Water having a specific existence form which has both gas and liquid properties when the temperature and pressure are higher than the critical state (T: 374.15 ℃, P: 22.12 MPa). Supercritical hydrothermal synthesis (SCHS) is a method for synthesizing metal and metal oxide nanoparticles by utilizing the characteristic of high specific heat of supercritical water to realize rapid temperature rise of preheated water and low-temperature precursor solution (usually metal salt solution) in a specific mixer and carrying out efficient chemical reaction.
The cooling system is crucial to the continuous supercritical hydrothermal synthesis technology, and directly influences the particle size and quality of the generated nanoparticles. In the cooling process, the mixed solution flowing out of the reactor enters a cooler to be rapidly cooled, and the nano crystals begin to nucleate, grow and mature to be precipitated into nano particles to a certain degree. The longer the cooling time is, the more easily the particles are aggregated, and the nanoparticles with poor quality are generated, so that the problems of shortening the cooling time and improving the cooling efficiency are urgently needed to be solved in the supercritical hydrothermal synthesis industrialization process.
At present, in a continuous supercritical hydrothermal synthesis system, a large amount of heat is lost by a multipurpose water-spraying cooler, and certain technical problems of the traditional sleeve-type or shell-and-tube cooler also include: (1) the heat exchange area utilization rate is low, the heat loss is large, the heat exchange efficiency is low, and the heat economy is poor; (2) the cooling time of the hot fluid is long, the retention time of the crystal in the tube is long, the temperature of the product at the outlet cannot be rapidly reduced, the particles are agglomerated in the nucleation and crystallization process, and the quality of the produced product is poor; (3) common materials always contain a large amount of components which are easy to scale and deposit, such as organic matters, inorganic salts, solid particles and the like, so that the problems of siltation, blockage and the like in a cooler pipe are caused, and the stability of a system is influenced. The above problems are more pronounced especially for large-scale continuous mass production of nanoparticles.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a microchannel rapid cooling device for preparing nano powder by a supercritical hydrothermal synthesis technology, which is different from the traditional cooler in that a multi-head external thread sleeve is adopted to form a thread microchannel, so that the heat exchange area is greatly expanded, the contact area is increased, the flow speed and the turbulence degree of fluid can be increased, the heat exchange is enhanced, the length of a flow channel is shortened, and the rapid cooling is realized. In addition, the end cover adopts a step sealing structure, so that the sealing performance is improved. The whole device has the functions of realizing rapid cooling and preventing nano-particles from agglomerating, can improve the stability and the economical efficiency of a supercritical hydrothermal synthesis nano-material system, effectively solves the problem of agglomeration prevention of the SCHS technology, and accelerates the industrialization process of the SCHS technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a quick cooling device of microchannel for supercritical hydrothermal synthesis technology preparation nanometer powder which characterized in that, includes top-down distribution's reposition of redundant personnel top cap 13, heat transfer casing 18 and bottom 22, wherein:
the split flow top cover 13 is provided with three inlet and outlet cavities 2, namely a cold fluid outlet 1, a cold fluid outlet 11 and a hot fluid inlet 12;
an external thread sleeve 19 is arranged on the inner wall of the heat exchange shell 18, the external thread sleeve 19 is tightly nested with the external thread base body 17, a thread-shaped cavity formed between the heat exchange shell 18 and the external thread sleeve 19 is a cold fluid thread channel 7, a thread-shaped cavity formed between the external thread sleeve 19 and the external thread base body 17 is a hot fluid thread channel 5, and a plurality of cold fluid straight channels 6 are distributed in the external thread base body 17;
the bottom cover 22 is provided with three inlets and outlets of a cold fluid inlet 10, a cold fluid inlet 23 and a hot fluid outlet 9 and an inlet cavity 8;
the hot fluid inlet 12, the hot fluid threaded channel 5 and the hot fluid outlet 9 are sequentially communicated to form a hot fluid passage, the cold fluid inlet 10, the inlet cavity 8, the cold fluid straight channel 6, the outlet cavity 2 and the cold fluid outlet 11 are sequentially communicated to form a cold fluid passage, and the cold fluid inlet 23, the cold fluid threaded channel 7 and the cold fluid outlet 1 are sequentially communicated to form a cold fluid passage.
Preferably, the first outlet 11 and the outlet cavity 2 of the cold fluid are located at the axial center of the diversion top cover 13, and the first inlet 10 and the inlet cavity 8 of the cold fluid are located at the axial center of the bottom cover 22.
Preferably, the outer ring of the flow dividing top cover 13 is nested with an upper flange a14, the outer ring of the top of the heat exchange shell 18 is nested with an upper flange B16, the outer ring of the bottom is nested with a lower flange a20, the outer ring of the bottom cover 22 is nested with a lower flange B21, and the upper flange a14 and the upper flange B16, as well as the lower flange a20 and the lower flange B21, are all fixed by a plurality of fastening bolts 15.
Preferably, the upper flange a14 and the upper flange B16 are tightly engaged with the side wall surfaces of the top of the heat exchange housing 18 and the top of the split flow top cover 13 respectively, the lower flange a20 and the lower flange B21 are tightly engaged with the side wall surfaces of the bottom of the heat exchange housing 18 and the bottom cover 22 respectively, a plurality of fastening bolts 15 between the contact surfaces of the flanges are circularly and symmetrically distributed, and the sealing surfaces of the upper flange a14 and the upper flange B16 and the lower flange a20 and the lower flange B21 are in the form of a planar flange, a concave-convex flange or a tongue-and-groove flange.
Preferably, the shunting top cover 13 adopts a step sealing mode, a boss structure is arranged at the lower part of the shunting top cover, a boss contact surface is connected and sealed with the external thread base body 17 through a second sealing washer 4, concave parts are distributed on the outer ring and connected and sealed with the external thread sleeve 19 through the second sealing washer 4, the bottom cover 22 adopts a step sealing mode, a boss structure is arranged at the upper part of the bottom cover, the boss contact surface is connected and sealed with the external thread base body 17 through the second sealing washer 4, and the concave contact surface is connected and sealed with the external thread sleeve 19 through the second sealing washer 4.
Preferably, the mutual contact surfaces of the shunt top cover 13 and the heat exchange shell 18 and the mutual contact surfaces of the heat exchange shell 18 and the bottom cover 22 are filled with a first sealing gasket 3.
Preferably, the externally threaded base 17 and the externally threaded sleeve 19 are configured as two-start, four-start or eight-start multiple start threads.
Preferably, the cold fluid straight channels 6 are distributed in a ring shape, and are arranged on the external thread base body 17 at equal intervals and equal angles, and the diameter of each straight channel pore is 1-3 mm.
Preferably, the hot fluid thread passage 5 and the cold fluid thread passage 7 exhibit a thread-like inclined equidistant distribution, the spacing between the threads being related to the configuration of the externally threaded base 17 and the externally threaded sleeve 19.
Preferably, the material of the externally threaded base 17 and the externally threaded sleeve 19 is stainless steel 316L, carbon steel, low alloy steel, copper, aluminum, nickel, copper alloy, aluminum alloy or nickel alloy.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention discloses a micro-channel rapid cooling device for preparing nano powder by a supercritical hydrothermal synthesis technology.
(2) The invention discloses a microchannel rapid cooling device for preparing nano powder by supercritical hydrothermal synthesis technology, wherein a threaded microchannel is formed by designing a multi-thread sleeve structure in the supercritical hydrothermal synthesis nano material process, so that the contact area of fluid and a wall surface is increased, the flow velocity and turbulence degree of the fluid are enhanced, the countercurrent heat exchange is enhanced, the flow channel is shortened, the rapid cooling is realized, and the blockage of a cooler can be prevented.
(3) According to the microchannel rapid cooling device for preparing the nano powder by the supercritical hydrothermal synthesis technology, disclosed by the invention, the end cover adopts a step sealing structure, so that the sealing property under high temperature and high pressure is improved, and the economical efficiency and the stability of a system are favorably improved.
(4) The microchannel rapid cooling device for preparing the nano powder by the supercritical hydrothermal synthesis technology disclosed by the invention can quickly reduce the temperature of a product at the outlet of the reactor, accelerate the crystallization rate, improve the conversion rate and the nucleation rate, and can effectively solve the problem of agglomeration prevention in the supercritical hydrothermal synthesis nano material technology, wherein the particle size of the produced nano material is small, the dispersity is good, the nucleation crystals are not easy to agglomerate.
Drawings
FIG. 1 is a schematic view of a microchannel rapid cooling device according to the present invention.
FIG. 2 is a schematic view of an externally threaded base and an externally threaded sleeve of the microchannel rapid cooling device of the present invention.
Wherein: 1 is a cold fluid second outlet; 2 is an outlet cavity; 3 is a first sealing washer; 4 is a second sealing washer; 5 is a hot fluid thread channel; 6 is a cold fluid straight channel; 7 is a cold fluid thread channel; 8 is an inlet cavity; 9 is a hot fluid outlet; 10 is an inlet of cold fluid; 11 is an outlet of the cold fluid; 12 is a hot fluid inlet; 13 is a shunting top cover; 14 is an upper flange A; 15 is a fastening bolt; 16 is an upper flange B; 17 is an external thread base body; 18 is a heat exchange shell; 19 is an external thread sleeve II; 20 is the lower flange A; 21 is lower flange B; 22 is a bottom cover; and 23 is a cold fluid inlet.
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.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, a microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology comprises a flow-dividing top cover 13, a heat exchange shell 18 and a bottom cover 22 distributed from top to bottom, wherein:
the split flow top cover 13 is provided with three inlet and outlet cavities 2, namely a cold fluid outlet 1, a cold fluid outlet 11 and a hot fluid inlet 12, and the cold fluid outlet 11 and the outlet cavity 2 can be positioned at the axis of the split flow top cover 13, so that better effect is achieved;
the inner wall of the heat exchange shell 18 is provided with an external thread sleeve 19, a cylindrical cavity is arranged inside the external thread sleeve 19, and the external thread base body 17 is inserted into the cylindrical cavity and is tightly nested with the external thread sleeve 19. The structure of the external thread base body 19 and the external thread sleeve 19 can be but not limited to a double-start, a four-start and an eight-start multi-start thread, the material can be stainless steel 316L, carbon steel, low alloy steel, copper, aluminum or nickel and alloy thereof, the thread-shaped cavity formed between the heat exchange shell 18 and the external thread sleeve 19 is a cold fluid thread channel 7, the thread-shaped cavity formed between the external thread sleeve 19 and the external thread base body 17 is a hot fluid thread channel 5, the hot fluid thread channel 5 and the cold fluid thread channel 7 are distributed in a thread-shaped inclined equidistant manner, and the interval between threads is related to the structures of the external thread base body 17 and the external thread sleeve 19. A plurality of cold fluid straight channels 6 are distributed in the outer thread base body 17, the cold fluid straight channels 6 are distributed in a ring shape and are arranged on the outer thread base body 17 at equal intervals and equal angles, the diameter of a pore of each straight channel is 1-3 mm, and the rings are concentrically distributed.
The bottom cover 22 is provided with three inlets and outlets, namely a cold fluid first inlet 10, a cold fluid second inlet 23 and a hot fluid outlet 9, and an inlet cavity 8, wherein the cold fluid first inlet 10 and the inlet cavity 8 are positioned at the axis of the bottom cover 22, so that better effect is realized;
the hot fluid inlet 12, the hot fluid threaded channel 5 and the hot fluid outlet 9 are sequentially communicated to form a hot fluid passage, the cold fluid first inlet 10, the inlet cavity 8, the cold fluid first passage 6, the outlet cavity 2 and the cold fluid first outlet 11 are sequentially communicated to form a cold fluid first passage, and the cold fluid second inlet 23, the cold fluid threaded channel 7 and the cold fluid second outlet 1 are sequentially communicated to form a cold fluid second passage.
According to the structure, the invention can achieve two-stage countercurrent heat exchange at most, and the working process is as follows:
a stream of water solution under normal temperature or low temperature state is taken as a cold fluid I, enters from a cold fluid I inlet 10 at the bottom of the device, is evenly dispersed into a cold fluid straight channel 6 through an inlet cavity 8, and then flows out from a cold fluid I outlet 11 at the upper part of the device through an outlet cavity 2.
And the other stream of aqueous solution in a normal temperature or low temperature state is taken as a cold fluid II to enter from a cold fluid II inlet 23 at the bottom of the device, enters the peripheral cold fluid threaded channel 7 through a channel of the bottom cover 22, passes through a pipeline of the shunting top cover 1, and then flows out from a cold fluid II outlet 1 at the upper part of the device.
Reaction solution with certain concentration after supercritical hydrothermal synthesis reaction is used as hot fluid, the reaction solution flows out of the mixer and enters from a hot fluid inlet 12 at the top of the device, the hot fluid is distributed to the hot fluid threaded passage 5 through a passage in the shunting top cover 1, the hot fluid flowing in a reverse direction in the hot fluid threaded passage 5 meets cold fluid flowing in a forward direction in the cold fluid straight passage 6 through the wall surface of the external thread base body 7, rapid and uniform reverse-flow heat exchange is carried out, the heat exchange area is greatly increased, the heat exchange efficiency is improved, the temperature of the hot fluid is rapidly reduced, and the process is one-stage reverse-flow heat exchange.
Meanwhile, the hot fluid flowing back from the hot fluid threaded passage 5 meets the cold fluid flowing back from the cold fluid threaded passage 7 through the wall surface of the external thread sleeve 9, secondary countercurrent heat exchange is carried out, and the temperature of the hot fluid is further reduced. Through two-stage countercurrent heat exchange, the heat of the hot fluid is taken away by the cold fluid, the retention time of the fluid is shortened, the heat exchange efficiency of the cooler is improved, the heat regenerator channel is prevented from being blocked, the crystal can be rapidly nucleated, the formed nano particles are small in particle size and good in dispersity, and the long-term, stable and safe operation of the system is guaranteed.
Wherein, on the mechanical connecting structure of the invention, the three-part structure can be connected by flanges. Specifically, an upper flange a14 can be nested on the outer ring of the diversion top cover 13, an upper flange B16 can be nested on the outer ring of the top of the heat exchange shell 18, a lower flange a20 can be nested on the outer ring of the bottom, a lower flange B21 can be nested on the outer ring of the bottom cover 22, the upper flange a14 and the upper flange B16, and the lower flange a20 and the lower flange B21 can be fixed through a plurality of fastening bolts 15, and the contact surfaces of the diversion top cover 13 and the heat exchange shell 18, and the heat exchange shell 18 and the bottom cover 22 can be filled with a first sealing gasket 3.
The upper flange A14 and the upper flange B16 are respectively and tightly connected with the side wall surfaces of the top of the shunt top cover 13 and the top of the heat exchange shell 18, the lower flange A20 and the lower flange B21 are respectively and tightly connected with the side wall surfaces of the bottom of the heat exchange shell 18 and the bottom cover 22, a plurality of fastening bolts 15 between contact surfaces of the flanges are circularly and symmetrically distributed, and the sealing surfaces of the upper flange A14 and the upper flange B16, and the lower flange A20 and the lower flange B21 can be plane flanges, concave-convex flanges, tongue-groove-surface flanges or other sealing surface flanges.
In a specific structure of the invention, the shunt top cover 13 adopts a step sealing mode, the lower part of the shunt top cover is provided with a boss structure, a boss contact surface is connected and sealed with the external thread base body 17 through a second sealing washer 4, the concave part of the shunt top cover is distributed on the outer ring and connected and sealed with the external thread sleeve 19 through the second sealing washer 4, the bottom cover 22 adopts a step sealing mode, the upper part of the shunt top cover is provided with a boss structure, the boss contact surface is connected and sealed with the external thread base body 17 through the second sealing washer 4, and the concave contact surface is connected and sealed with the external thread sleeve.
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. The utility model provides a quick cooling device of microchannel for supercritical hydrothermal synthesis technology preparation nanometer powder which characterized in that, includes reposition of redundant personnel top cap (13), heat transfer casing (18) and bottom (22) that top-down distributes, wherein:
the split flow top cover (13) is provided with a cold fluid secondary outlet (1), a cold fluid primary outlet (11) and a hot fluid inlet (12), and three inlet, outlet and outlet cavities (2);
an external thread sleeve (19) is arranged on the inner wall of the heat exchange shell (18), the external thread sleeve (19) is tightly nested with the external thread base body (17), a thread-shaped cavity formed between the heat exchange shell (18) and the external thread sleeve (19) is a cold fluid thread channel (7), a thread-shaped cavity formed between the external thread sleeve (19) and the external thread base body (17) is a hot fluid thread channel (5), and a plurality of cold fluid straight channels (6) are distributed in the external thread base body (17);
the bottom cover (22) is provided with a cold fluid first inlet (10), a cold fluid second inlet (23) and a hot fluid outlet (9), and three inlets and outlets and an inlet cavity (8) are arranged on the bottom cover;
the hot fluid inlet (12), the hot fluid threaded channel (5) and the hot fluid outlet (9) are sequentially communicated to form a hot fluid passage, the cold fluid inlet (10), the inlet cavity (8), the cold fluid straight channel (6), the outlet cavity (2) and the cold fluid first outlet (11) are sequentially communicated to form a cold fluid passage, and the cold fluid second inlet (23), the cold fluid threaded channel (7) and the cold fluid second outlet (1) are sequentially communicated to form a cold fluid passage.
2. The microchannel rapid cooling device for preparing nanopowders by supercritical hydrothermal synthesis technology of claim 1, wherein the first cold fluid outlet (11) and the outlet cavity (2) are located at the axial center of the diversion top cover (13), and the first cold fluid inlet (10) and the inlet cavity (8) are located at the axial center of the bottom cover (22).
3. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology according to claim 1, wherein an upper flange a (14) is nested on an outer ring of the shunt top cover (13), an upper flange B (16) is nested on an outer ring of a top of the heat exchange housing (18), a lower flange a (20) is nested on an outer ring of a bottom, a lower flange B (21) is nested on an outer ring of a bottom cover (22), and the upper flange a (14) and the upper flange B (16) as well as the lower flange a (20) and the lower flange B (21) are all fixed by a plurality of fastening bolts (15).
4. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 3, wherein the upper flange A (14) and the upper flange B (16) are respectively tightly connected with the side wall surfaces of the top of the flow dividing top cover (13) and the top of the heat exchange shell (18), the lower flange A (20) and the lower flange B (21) are respectively tightly connected with the side wall surfaces of the bottom of the heat exchange shell (18) and the bottom cover (22), the plurality of fastening bolts (15) between the contact surfaces of the flanges are symmetrically distributed in a circular ring, and the sealing surfaces of the upper flange A (14) and the upper flange B (16) and the lower flange A (20) and the lower flange B (21) are in the form of a planar flange, a concave-convex flange or a tongue-and groove flange.
5. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 1, wherein the flow dividing top cover (13) adopts a step sealing form, the lower part is provided with a boss structure, the boss contact surface is connected and sealed with the external thread base body (17) through a second sealing washer (4), the concave part is distributed on the outer ring and is connected and sealed with the external thread sleeve (19) through the second sealing washer (4), the bottom cover (22) adopts a step sealing form, the upper part is provided with a boss structure, the boss contact surface is connected and sealed with the external thread base body (17) through the second sealing washer (4), and the concave contact surface is connected and sealed with the external thread sleeve (19) through the second sealing washer (4).
6. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 1, wherein the mutual contact surfaces of the shunting top cover (13) and the heat exchange shell (18) and the bottom cover (22) are filled with a first sealing washer (3).
7. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 1, wherein the structure of the externally threaded base (17) and the externally threaded sleeve (19) is a two-start, four-start or eight-start multi-start thread.
8. The microchannel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology according to claim 1, wherein the cold fluid straight channels (6) are distributed in a ring shape and are arranged on the external thread substrate (17) at equal distances and equal angles, and the pore diameter of each straight channel is 1-3 mm.
9. The micro-channel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 1, wherein the hot fluid thread channel (5) and the cold fluid thread channel (7) are in a thread-like inclined equidistant distribution, and the interval between threads is related to the structure of the external thread base (17) and the external thread sleeve (19).
10. The micro-channel rapid cooling device for preparing nano-powder by supercritical hydrothermal synthesis technology as claimed in claim 1 or 9, wherein the material of the externally threaded base (17) and the externally threaded sleeve (19) is stainless steel 316L, carbon steel, low alloy steel, copper, aluminum, nickel, copper alloy, aluminum alloy or nickel alloy.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113813898A (en) * | 2021-10-22 | 2021-12-21 | 西安交通大学 | Combined supercritical hydrothermal synthesis micro-channel reactor |
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