CN111256487A - Steam cooling device and method for forming circulation loop - Google Patents
Steam cooling device and method for forming circulation loop Download PDFInfo
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- CN111256487A CN111256487A CN202010055142.3A CN202010055142A CN111256487A CN 111256487 A CN111256487 A CN 111256487A CN 202010055142 A CN202010055142 A CN 202010055142A CN 111256487 A CN111256487 A CN 111256487A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B5/00—Condensers employing a combination of the methods covered by main groups F28B1/00 and F28B3/00; Other condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a steam cooling device and a method for forming a circulation loop, which consists of a steam inlet, a water collecting tank, an adjusting valve, a throttling orifice plate, a cooling outer pipe, a baffle plate, a spraying device, a cooling water channel, a cooling inner pipe and a steam outlet, wherein the throttling orifice in the throttling orifice plate is subjected to chamfering treatment; the cooling outer pipe adopts a spiral grooved pipe to realize the enhanced heat exchange; the baffle forms an included angle with the cooling outer pipe when being installed; the spraying devices are arranged in a staggered manner, and spray the atomized cooling water to the steam to cool the steam; the steam outlet is connected with a vacuum pump; the cooling water channel leads the water in the water collecting tank into the spraying device to form circulation. The steam is cooled by the circulating water to form a gas-liquid mixing area to increase the heat exchange coefficient, so that the fluid in the cooling inner pipe is cooled, the water resource is saved, and the operation is convenient and fast.
Description
Technical Field
The invention relates to the technical field of steam cooling equipment, in particular to a steam cooling device forming a circulation loop.
Background
In modern industry, the water consumption of cooling equipment occupies 70-80% of the water amount, and under the background of water resource shortage, the evaporation potential and specific heat of water are far greater than the specific heat of gas, so the cooling effect of evaporation cooling is more obvious, and the evaporative cooling technology is gradually developed by means of the characteristics of the evaporative cooling technology.
The evaporative cooling method organically combines air cooling and water cooling, mainly adopts the process of exchanging heat inside and outside the cooling pipe, can recycle cooling water, saves water resources and reduces water pressure in industry. In the in-service use process, the cooling water is easily piled up in the heat exchange tube, produces the incrustation scale, and the condensation liquid drop that can not in time discharge simultaneously can make the condensation liquid film constantly thicken, is unfavorable for the heat transfer, has reduced cooling efficiency, is not conform to energy-efficient development demand.
Disclosure of Invention
Aiming at the defects of the existing steam type cooling device in the using process, the invention provides the steam cooling device forming the circulating loop, which can promote liquid drops to fall, reduce the thickness of a condensed liquid film, further save water resources and improve cooling efficiency.
The invention adopts the following technical scheme:
a steam cooling device forming a circulation loop comprises a steam inlet, a water collecting tank, a regulating valve, a throttling orifice plate, a cooling outer pipe, a baffle plate, a spraying device, a cooling water channel, a cooling inner pipe and a steam outlet;
the steam inlet is arranged at the upper end of the side wall of the water collecting tank, the cooling outer pipe is vertically arranged at the top of the water collecting tank, the top of the water collecting tank is communicated with the bottom of the cooling outer pipe through a throttling orifice, and the steam outlet is arranged at the upper part of the side wall of the cooling outer pipe; the cooling inner pipe is spirally arranged in the inner cavity of the cooling outer pipe in an ascending way, and the inlet and the outlet of the cooling inner pipe are both positioned outside the cooling outer pipe; fins are arranged outside the cooling inner pipe; a plurality of baffles and a plurality of spray sets are arranged on the inner wall of the cooling outer pipe along different heights, the baffles extend into a steam flow channel between the cooling inner pipe and the cooling outer pipe, and the spray sets are connected with the water collecting tank through a cooling water channel with a regulating valve and are used for atomizing cooling water in the water collecting tank and then spraying the cooling water into the steam flow channel.
Preferably, the baffle is corrugated, and a downward included angle is formed between the direction of a plate body of the baffle and the axis of the cooling outer pipe during installation so as to form a wavy channel for steam to circulate; the baffle plate extends into the concave side of the cooling inner pipe from the inner wall of the cooling outer pipe.
Preferably, the baffle is provided with a plurality of through holes for enabling the water gathered on the surface to flow into the water collecting tank, and the condensate film is prevented from being thickened continuously.
Preferably, the orifice in the orifice plate is chamfered.
Preferably, the cooling outer pipe is a spiral grooved pipe, and the inner wall of the spiral grooved pipe is provided with spiral grooves.
Preferably, the spraying devices are uniformly distributed on the inner wall of the cooling outer pipe along the way and the circumferential direction, and the opposite spraying devices are arranged in a staggered manner in height; the spraying direction of the cooling water of the spraying device is inclined downwards, and an included angle is formed between the spraying direction of the cooling water and the axial direction of the cooling outer pipe.
Preferably, the cooling inner pipe adopts a spiral coil, and the outer part of the cooling inner pipe is sprayed with an anti-rust coating.
Preferably, the steam outlet is connected to an external source of suction underpressure.
Preferably, the baffle is along length direction' S cross section, splices into S-shaped ripple by two arcs that are central symmetry, and the radius of curvature of every arc is 10mm, and the tangent angle of every arc initiating terminal is 22.5 with the contained angle of horizontal plane, and the ratio l/D of horizontal interval l between the baffle both ends and cooling outer tube diameter D is 0.6.
Another object of the present invention is to provide a steam cooling method using the steam cooling device, comprising: introducing steam to be cooled from a steam inlet, penetrating through a throttling orifice plate, entering a steam flow channel between a cooling inner pipe and a cooling outer pipe, and spirally rising under the obstruction of a baffle; in the process of introducing steam, continuously introducing the cooling water in the water collecting tank into a spraying device through a cooling water channel, mixing the atomized cooling water with rising steam, enabling part of the cooling water to absorb the heat of high-temperature steam and vaporize into steam, discharging the steam and the cooled steam from a steam outlet, condensing part of the high-temperature steam to form liquid drops, and enabling the liquid drops and the rest of the cooling water to flow into the water collecting tank again under the action of gravity to form a circulation loop; the steam to be cooled achieves fluid cooling within the cooling inner tube during flow through three aspects: firstly, cooling water is utilized to contact high-temperature steam and absorb a large amount of heat through vaporization, and meanwhile, spiral grooves of the cooling outer pipe are further beneficial to phase change heat exchange; secondly, the wave-shaped steam channel formed by staggered arrangement of the baffles promotes the full contact of the steam and the cooling water to form a gas-liquid mixing area for enhanced heat exchange; thirdly, a fin structure arranged outside the cooling inner tube is utilized, so that water on the surface of the fin is evaporated to take away a large amount of heat, and the cooling process of the internal steam is accelerated by combining air cooling and water cooling.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) in the steam cooling device, the small holes on the baffle plate enable condensed liquid drops to fall smoothly, a condensed liquid film is thinned, the wavy gas channel enables steam to be in full contact with cooling water, more heat is absorbed, and the cooling efficiency is improved;
(2) the steam cooling device disclosed by the invention utilizes various enhanced heat exchange methods, and combines air cooling and water cooling to form enhanced heat exchange in a gas-liquid mixing area, so that the cooling efficiency is improved, and meanwhile, the heat exchange area is increased and the size of equipment is reduced due to the use of an enhanced heat exchange structure;
(3) the steam cooling device of the invention prevents the cooling water from accumulating in the heat exchange pipe, so that more cooling water is added into the cooling circulation, and the water resource is saved.
Drawings
In order that the disclosure of the invention may be more readily understood, reference is now made to the following detailed description of the invention taken in conjunction with the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of a steam cooling apparatus according to the present invention;
FIG. 2 is a schematic cross-sectional view of a baffle according to the present invention taken along its length;
FIG. 3 is a schematic top plan view of a baffle in accordance with the present invention;
in the figure: 1. a steam inlet; 2. a water collection tank; 3. adjusting a valve; 4. a restriction orifice plate; 5. cooling the outer tube; 6. A baffle plate; 7. a spraying device; 8. a cooling water passage; 9. cooling the inner pipe; 10. and (4) a steam outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a steam cooling device constituting a circulation loop according to a preferred embodiment of the present invention includes a steam inlet 1, a water collection tank 2, a regulating valve 3, a throttle orifice 4, an outer cooling pipe 5, a baffle 6, a spray device 7, a cooling water passage 8, an inner cooling pipe 9, and a steam outlet 10.
Wherein, steam inlet 1 sets up in the lateral wall upper end of water catch bowl 2, and cooling outer tube 5 is vertical to be set up in water catch bowl 2 top, and the bottom intercommunication of water catch bowl 2 top through orifice plate 4 and cooling outer tube 5, and steam outlet 10 sets up in 5 lateral wall upper portions of cooling outer tube, treats that refrigerated steam lets in from steam inlet 1, rises after orifice plate 4, and the rethread steam outlet 10 is discharged. In order to ensure that the throttling hole in the throttling orifice plate 4 is subjected to chamfering treatment, the flow rate of steam is gradually increased, and the steam enters the cooling outer pipe 5 in a reasonable thermal state, so that energy dissipation is reduced.
During operation, a vacuum pump may be provided at the vapor outlet 10 to provide negative pressure as a motive force for the vapor to flow within the channel. The cooling inner pipe 9 is spirally arranged in the inner cavity of the cooling outer pipe 5 in an ascending way, the inlet and the outlet of the cooling inner pipe are both positioned outside the cooling outer pipe 5, a cooling medium is introduced into the cooling inner pipe 9 for air cooling, and the cooling medium can be water or other cooling agents. In order to improve the heat exchange efficiency, fins can be arranged outside the cooling inner pipe 9 along the way, so that the heat exchange area is improved.
In addition, in the invention, besides the air cooling heat exchange of the cooling inner pipe 9, the water cooling temperature reduction is also carried out by water mist spraying. The method is that a plurality of baffles 6 and a plurality of spraying devices 7 are arranged on the inner wall of the cooling outer pipe 5 along different heights, wherein the baffles 6 extend into a steam flow channel between the cooling inner pipe 9 and the cooling outer pipe 5, and each spraying device 7 is connected with the water collecting tank 2 through a cooling water channel 8 with a regulating valve 3 and is used for atomizing cooling water in the water collecting tank 2 and then spraying the atomized cooling water into the steam flow channel. The spraying devices 7 are uniformly distributed on the inner wall of the cooling outer pipe 5 along the way and the circumferential direction, and the opposite spraying devices 7 are arranged in a staggered way in height. In order to improve the cross-flow heat exchange efficiency, the spraying direction of the cooling water of the spraying device 7 is inclined downwards, and an included angle is formed between the spraying direction of the cooling water and the axial direction of the cooling outer pipe 5. This contained angle of spray set 7 can be favorable to steam and cooling water's intensive mixing, also can spray the outer wall of cooling inner tube 9 better, promotes the cooling of intraductal medium.
Meanwhile, the cooling outer tube 5 in the present embodiment is a spiral grooved tube having spiral grooves in its inner wall. Meanwhile, the cooling inner pipe 9 adopts a spiral coil pipe, and the outer part is sprayed with an antirust coating. This causes the overall steam flow path to assume a spiral form. The spiral grooved tube increases the heat exchange area, thins the boundary layer, promotes the mixing of cooling water and steam, is beneficial to phase change heat transfer, and ensures that the cooling water absorbs more heat. And the cooling inner tube 9 adopts spiral coil, and the fin is equipped with to the outside, has increased heat transfer area, makes intraductal steam can be by air cooling simultaneously, improves heat exchange efficiency, and the spraying of outside of tubes has prevented the impurity corrosion surface that contains in the cooling water, has prolonged the life of device simultaneously.
The steam cooling method based on the steam cooling device comprises the following specific steps: introducing steam to be cooled from a steam inlet 1, passing through a throttling orifice plate 4, entering a steam flow channel between a cooling inner pipe 9 and a cooling outer pipe 5, and spirally rising under the obstruction of a baffle 6; in the process of introducing steam, continuously introducing the cooling water in the water collecting tank 2 into a spraying device 7 through a cooling water channel 8, mixing the atomized cooling water with rising steam, enabling part of the cooling water to absorb the heat of high-temperature steam and then vaporize into steam, discharging the steam and the cooled steam from a steam outlet 10, condensing part of the high-temperature steam to form liquid drops, and enabling the liquid drops and the rest of the cooling water to flow into the water collecting tank 2 again under the action of gravity to form a circulation loop; the steam to be cooled achieves fluid cooling inside the cooling inner tube 9 during flow by three aspects: firstly, cooling water is utilized to contact high-temperature steam and absorb a large amount of heat through vaporization, and meanwhile, the spiral groove of the cooling outer pipe 5 is further beneficial to phase change heat exchange; secondly, the wave-shaped steam channel formed by staggered arrangement of the baffles 6 promotes the full contact of the steam and the cooling water to form a gas-liquid mixing area for enhanced heat exchange; thirdly, a fin structure arranged outside the cooling inner tube 9 is utilized, so that water on the surface of the fin is evaporated to take away a large amount of heat, and the cooling process of the internal steam is accelerated by combining air cooling and water cooling.
During the operation of the device, the amount of internal cooling water can be adjusted according to the target cooling effect. High-temperature steam flows into a steam inlet 1 in an initial state with the flow rate of 30t/h and the temperature of 250 ℃, the amount of cooling water is determined by taking the material balance and the heat balance as calculation principles according to the relevant theory of gas-liquid two-phase flow,
in the formula, WcwThe dosage of the temperature-reducing water is kg/h; wosThe output of outlet steam is kg/h; h isisIs the enthalpy of the inlet steam, kJ/kg; h isosIs the enthalpy of the outlet steam, kJ/kg; h iscwIs the enthalpy value of the cooling water, kJ/kg; h'osIs the enthalpy of saturated water, kJ/kg,
is the proportion of the non-evaporated part in the cooling water.
According to the actual demand, confirm the specific aperture size of governing valve 3, the quantity of adjustment cooling water guarantees that the cooling effect in the cooling tube reaches the best.
In order to improve the overall heat exchange efficiency of the high-temperature steam in the steam channel, the steam flow channel between the cooling inner pipe 9 and the cooling outer pipe 5 is structurally optimized in this embodiment, and the specific optimization measures are as follows:
the baffle 6 is arranged in a corrugated shape, and a downward included angle is formed between the plate body direction and the axis of the cooling outer pipe 5 during installation, so that a wave-shaped channel is formed for steam to circulate. The thickness w of the baffle 6 should not be too large. The plate body direction refers to a direction of a line connecting both ends of the baffle 6. Baffle 6 begins to stretch into the indent side of cooling inner tube 9 from cooling outer tube 5 inner wall, makes the high temperature steam separate at the baffle 6 that upward flow is the wimble from this, prolongs heat transfer time, strengthens heat exchange efficiency. As shown in fig. 2, the baffle 6 of this embodiment has a cross section along the length direction, and is formed by splicing two centrosymmetric arcs into an S-shaped corrugation. Simultaneously, as shown in fig. 3, a plurality of through holes are evenly arranged on the surface of the baffle 6 for making the water gathered on the surface flow into the water collecting tank 2, and the condensate film is prevented from being thickened continuously.
The structure and installation form of each baffle 6 in the device directly influence the heat exchange efficiency, and a great deal of optimization is carried out in the embodiment, which shows that the heat exchange effect is optimal when the ratio of the length l of each baffle to the diameter D of the cooling outer pipe is 0.6, and further experiments show that the optimal installation form of the baffles is given, in the embodiment, the curvature radius R of each arc is 10mm, the ratio of the horizontal distance l between the two ends of each baffle 6 to the diameter D of the cooling outer pipe is 0.6, because the baffles 6 are corrugated, the angle β between the baffles and the cooling outer pipe 5 can be adjusted during installation to be the angle between the vertical line of the installation end surface of the baffles 6 and the horizontal plane, the angle range of β is adjusted to be between 5 and 10 degrees, the included angle α between the tangent angle of the starting end of each arc and the horizontal plane is 22.5, and the optimal cooling effect of steam can be ensured under the installation form.
In order to illustrate the effect of the installation form of the baffle plate on the final effect, the device structure under different installation forms is tested in the embodiment, on the basis of the embodiment, two groups of comparison are additionally arranged, the baffle plate 6 is not arranged in the steam channel in the comparison group I, and the included angle α between the tangent angle of the starting end of each arc line and the horizontal plane is 0 degree by adjusting the installation angle of the baffle plate 6 in the comparison group II, namely, the horizontal state is maintained, and the comprehensive evaluation index PEC is tested under different installation states:
in the formula, Nu is a dimensionless heat exchange coefficient Nussel number; f is a resistance coefficient; subscript 0 represents the case where no baffles are used.
The result shows that when the included angle α is 22.5 degrees, the comprehensive evaluation index PEC of the cooling device of the embodiment is 1.41 times that of the cooling device without the baffle in the comparison group and 1.2 times that of the cooling device in the second comparison group.
The above embodiments are merely specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Other attempts to implement different methods will be apparent to those skilled in the art based on the present disclosure. But variations or substitutions introduced by the present invention without inventive efforts are covered within the protection scope of the present invention.
Claims (10)
1. A steam cooling device forming a circulation loop is characterized by comprising a steam inlet (1), a water collecting tank (2), a regulating valve (3), a throttling orifice plate (4), a cooling outer pipe (5), a baffle plate (6), a spraying device (7), a cooling water channel (8), a cooling inner pipe (9) and a steam outlet (10);
the steam inlet (1) is arranged at the upper end of the side wall of the water collecting tank (2), the cooling outer pipe (5) is vertically arranged at the top of the water collecting tank (2), the top of the water collecting tank (2) is communicated with the bottom of the cooling outer pipe (5) through a throttling hole plate (4), and the steam outlet (10) is arranged at the upper part of the side wall of the cooling outer pipe (5); the cooling inner pipe (9) is spirally arranged in the inner cavity of the cooling outer pipe (5) in an ascending way, and the inlet and the outlet of the cooling inner pipe are positioned outside the cooling outer pipe (5); fins are arranged outside the cooling inner pipe (9); a plurality of baffles (6) and a plurality of spray devices (7) are arranged on the inner wall of the cooling outer pipe (5) along different heights, the baffles (6) extend into a steam flow channel between the cooling inner pipe (9) and the cooling outer pipe (5), and the spray devices (7) are connected with the water collecting tank (2) through a cooling water channel (8) with a regulating valve (3) and are used for spraying cooling water in the water collecting tank (2) into the steam flow channel after being atomized.
2. The steam cooling device forming a circulation loop according to claim 1, wherein the baffle (6) is corrugated, and the plate body of the baffle forms a downward included angle with the axis of the cooling outer pipe (5) when the baffle is installed, so that a corrugated channel is formed for steam to flow through; the baffle (6) extends into the concave side of the cooling inner pipe (9) from the inner wall of the cooling outer pipe (5).
3. The steam cooling device forming a circulation loop according to claim 1, wherein the baffle plate (6) is provided with a plurality of through holes for allowing water collected on the surface to flow into the water collection tank (2) so as to prevent the condensate film from being thickened continuously.
4. The steam cooling device constituting a circulation circuit according to claim 1, wherein the orifice in the orifice plate (4) is subjected to a chamfering process.
5. The steam cooling device constituting the circulation circuit according to claim 1, wherein the cooling outer pipe (5) is a spiral grooved pipe having spiral grooves in an inner wall thereof.
6. The steam cooling device constituting a circulation circuit according to claim 1, wherein the shower devices (7) are uniformly arranged on the inner wall of the cooling outer pipe (5) along the way and in the circumferential direction, and the opposing shower devices (7) are arranged in a staggered manner in height; the spraying direction of the cooling water of the spraying device (7) is inclined downwards, and an included angle is formed between the spraying direction of the cooling water and the axial direction of the cooling outer pipe (5).
7. The steam cooling device constituting the circulation circuit according to claim 1, wherein the cooling inner pipe (9) is a spiral coil pipe and is externally coated with a rust preventive coating.
8. Steam cooling device constituting a circulation circuit according to claim 1, characterised in that said steam outlet (10) is connected to an external suction underpressure source.
9. The steam cooling device forming the circulation loop according to claim 1, wherein the baffle (6) is formed by splicing two centrosymmetric arcs into an S-shaped corrugation along the cross section of the length direction, the curvature radius of each arc is 10mm, the included angle between the tangent angle of the starting end of each arc and the horizontal plane is 22.5 degrees, and the ratio l/D of the horizontal distance l between the two ends of the baffle (6) to the diameter D of the cooling outer pipe is 0.6.
10. A steam cooling method using the steam cooling device according to any one of claims 1 to 9, characterized in that: introducing steam to be cooled from a steam inlet (1), passing through a throttling orifice plate (4), entering a steam flow channel between a cooling inner pipe (9) and a cooling outer pipe (5), and spirally rising under the obstruction of a baffle (6); in the steam introducing process, continuously introducing cooling water in the water collecting tank (2) into a spraying device (7) through a cooling water channel (8), mixing the atomized cooling water with rising steam, enabling part of the cooling water to absorb the heat of high-temperature steam and vaporize into steam, discharging the steam and the cooled steam from a steam outlet (10), condensing part of the high-temperature steam to form liquid drops, and enabling the liquid drops and the rest of the cooling water to flow into the water collecting tank (2) again under the action of gravity to form a circulation loop; the steam to be cooled achieves fluid cooling in the cooling inner pipe (9) in three aspects during the flow: firstly, cooling water is utilized to contact high-temperature steam and absorb a large amount of heat through vaporization, and meanwhile, spiral grooves of the cooling outer pipe (5) are further beneficial to phase change heat exchange; secondly, the wave-shaped steam channel formed by staggered arrangement of the baffles (6) is utilized to promote the full contact of the steam and the cooling water, and a gas-liquid mixing area is formed to enhance heat exchange; thirdly, a fin structure arranged outside the cooling inner pipe (9) is utilized, so that water on the surface of the fin is evaporated to take away a large amount of heat, and the cooling process of the internal steam is accelerated by combining air cooling and water cooling.
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| CN112881462A (en) * | 2021-01-14 | 2021-06-01 | 青岛畅隆重型装备有限公司 | Performance testing device and method for high-flux heat exchange tube in high-pressure environment |
| CN115161706A (en) * | 2022-06-02 | 2022-10-11 | 无锡隆基氢能科技有限公司 | Washing and separating device for hydrogen production system and hydrogen production system |
| CN115644288A (en) * | 2022-11-09 | 2023-01-31 | 西北农林科技大学 | Preparation method and device of high-theabrownin mulberry leaf Fu tea |
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| CN112881462A (en) * | 2021-01-14 | 2021-06-01 | 青岛畅隆重型装备有限公司 | Performance testing device and method for high-flux heat exchange tube in high-pressure environment |
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| CN115644288A (en) * | 2022-11-09 | 2023-01-31 | 西北农林科技大学 | Preparation method and device of high-theabrownin mulberry leaf Fu tea |
| CN115644288B (en) * | 2022-11-09 | 2024-03-29 | 西北农林科技大学 | Preparation method and device of high-theabrownin mulberry leaf Fuzhuan tea |
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| CN111256487B (en) | 2021-02-12 |
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