CN210159224U - Microwave-enhanced continuous flash evaporation system for moving feed liquid in thin layer and liquid drop flow mode - Google Patents
Microwave-enhanced continuous flash evaporation system for moving feed liquid in thin layer and liquid drop flow mode Download PDFInfo
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- CN210159224U CN210159224U CN201920768149.2U CN201920768149U CN210159224U CN 210159224 U CN210159224 U CN 210159224U CN 201920768149 U CN201920768149 U CN 201920768149U CN 210159224 U CN210159224 U CN 210159224U
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Abstract
The utility model discloses a microwave-enhanced continuous flash evaporation system for liquid material moving in a thin layer and a liquid drop flow, which comprises a flash evaporation tank, a microwave feed port, a liquid inlet, a liquid outlet, a steam extraction port and a sieve tray, wherein the microwave feed port is fixedly arranged on the side wall, the top or the bottom of the flash evaporation tank; at least one layer of sieve tray is arranged below the liquid inlet in the flash tank. The utility model discloses an at least one deck sieve tray is set up in the flash tank, make during microwave flash evaporation feed liquid permeate the sieve tray and disperse into the liquid drop that the wave absorption is good, and thin layer liquid film on the sieve tray is added, and gas-liquid specific surface area promotes by a wide margin; the sieve tray can effectively prolong the retention time of the feed liquid, thereby greatly improving the evaporation efficiency; the effect of multi-stage flash evaporation is achieved by single-stage evaporation, and the pump and heat loss in the material circulation process are avoided; the device has the characteristics of simple structure, high evaporation efficiency, low energy consumption and dynamic continuous evaporation.
Description
Technical Field
The utility model belongs to the technical field of distillation plant, concretely relates to simple structure, evaporation efficiency height, energy consumption are low, can the continuous flash distillation system is reinforceed with thin layer and droplet stream movement's microwave to the feed liquid of dynamic continuous evaporation.
Background
Flash distillation (flash distillation) is a process in which water is heated to a certain temperature under a certain pressure, then is injected into a container with lower pressure in the next stage, and sudden expansion is carried out to vaporize part of the water into steam. A system composed of a plurality of such processes is called "multi-stage flash distillation".
In the microwave flash evaporation, a flash evaporation cavity is optimally designed into a microwave resonant cavity, so that microwave energy enters the flash evaporation cavity through a feed port and is absorbed by target feed liquid, the temperature of the feed liquid is quickly raised in situ, and enough energy is supplied to continuously boil the target feed liquid, thereby achieving the purpose of strengthening the evaporation process.
In the traditional single-stage flash process, the feed liquid to be separated is fed when the bubble point is reached, meanwhile, the heating quantity is input into the flash unit, the saturated liquid reaches a new vapor-liquid equilibrium state after being heated, the vapor phase rich in light components is discharged from the top of the flash tank, the liquid phase rich in heavy components is discharged from the bottom, and the whole separation process is completed at one time. In a single stage flash process, if the heating power is increased and the top discharge is increased but the light component content is decreased while the feed flow is constant, the heating power is decreased and the top light component content is increased but the discharge is decreased. However, in the actual liquid-liquid separation process, the discharge flow and the light component content at the top of the flash tank are expected to be higher, so that the single-stage flash cannot achieve the practical liquid-liquid separation effect simply by increasing or reducing the heating capacity in unit time. Although the evaporation efficiency can be improved to a certain extent by increasing the vacuum degree, the evaporation tank is continuously fed and belongs to a semi-open system, and the vacuum degree is difficult to increase, so that the improvement of the evaporation efficiency is also limited.
In the multistage flash distillation process, get into first order flash distillation unit under the material liquid bubble point condition, the ejection of compact of bottom is as the feeding of next stage flash distillation unit to this analogizes, mixes the top ejection of compact in the unit of finally will a plurality of flash distillations as final ejection of compact. In the multistage flash evaporation process, the temperature difference in the separation process is reduced, so that the irreversibility in the process is reduced, the thermodynamic efficiency is improved, the separation efficiency is improved, and the content of light components at the top and the molar flow are increased. However, since the multistage flash evaporation needs to guide the feed liquid of the flash evaporation unit of the previous stage into the next stage through a pump, a pipeline and the like, and each stage of flash evaporation unit needs an energy supply unit, the structure is complex, the equipment flow is long, the investment cost is high, and the heat loss in the conveying process is large, so that the loss is high.
The process of a layer of liquid with smaller thickness flowing downwards along the wall surface under the action of gravity is called falling film flow, and is a special forced motion and the basis of the heat and mass transfer process of the traditional flash evaporation. In a traditional flash tank, feed liquid generally flows along a falling film plate of a plate heat exchanger in a falling film mode, an evaporation phase change is accompanied in a liquid film falling process, a condensation phase change is accompanied in a vapor phase rising process, and heat released in the condensation process is used for heating a liquid film to evaporate the liquid film. Because traditional falling liquid film flows and must pass through falling the diaphragm plate as the heat transfer surface, not only heat exchange efficiency is low, easy scale deposit moreover, and the later maintenance is difficult.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a simple structure, evaporation efficiency height, energy consumption are low, can the continuous flash distillation system is reinforceed with thin layer and droplet stream motion's microwave to the feed liquid of dynamic continuous evaporation.
The purpose of the utility model is realized like this: including flash tank, microwave feeder, inlet, liquid outlet, extraction steam port, sieve tray, the microwave feeder is fixed to be set up in lateral wall, top or the bottom of flash tank, the fixed inlet that is provided with in top of flash tank and the fixed liquid outlet that is provided with in bottom, the top of flash tank or the fixed extraction steam port that is provided with in side upper portion, the inherent inlet below of flash tank is provided with at least one deck sieve tray.
The utility model has the advantages that:
1. the utility model discloses a set up the sieve tray in the flash tank, not only can effectively improve the area that the falling liquid film flows, can disperse the liquid drop for the liquid drop that the wave absorption nature is good when the microwave flash distillation in addition, thin layer liquid film on the sieve tray for gas-liquid specific surface area promotes by a wide margin, thereby can show increase evaporation phase interface area, improves heat exchange efficiency.
2. The utility model discloses a screen tray can make the feed liquid enter into the dwell time of outflow from the inlet and can reach several minutes ~ dozens of minutes, can show the residence evaporation time who improves the feed liquid, and the microwave can improve dozens of degrees with feed liquid temperature at this in-process gradually to improve evaporation efficiency greatly, make and pass through the utility model discloses a single-stage evaporation just can reach the discharge flow and the higher target of light component content all at flash tank top, it is comparatively simple to compare multistage flash distillation structure, and equipment flow is short moreover, and investment cost is low, effectively avoids the calorific loss of multistage flash distillation material high temperature circulation in-process pump and pipeline in addition, and whole energy consumption is lower.
3. The utility model discloses a sieve tray can adopt wave-transparent material or wave-absorbing material, and wave-transparent material can make the microwave fine pierce through direct heating target solution, and wave-absorbing material can also be through microwave concurrent heating feed liquid and sieve tray, and the sieve tray exchanges heat again and gives the feed liquid, and the thermal efficiency is higher.
4. The utility model discloses a feed liquid directly accepts microwave energy in the sieve dish of wave-transparent material and acquires latent heat, and not only heat exchange efficiency is high, and the sieve dish only plays the evaporation phase boundary area and the evaporation time of delay that increase the feed liquid in the flash tank in addition, compares the flash distillation equipment among the prior art and has cancelled the heat-transfer surface to can prevent the scale deposit, later maintenance is easy.
5. The utility model discloses a microwave keeps the acquireing latent heat that feed liquid lasts in the flash tank to can realize the continuous evaporation process of developments.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is an enlarged view A of FIG. 1;
FIG. 3 is a second schematic view of the structure of the present invention;
FIG. 4 is an enlarged view B of FIG. 2;
in the figure: 1-flash tank, 101-upper metal cover, 102-flash tank body, 103-lower end socket, 2-microwave feed port, 3-liquid inlet, 4-liquid outlet, 5-steam extraction port, 6-sieve tray, 601-sieve pore, 602-flange, 603-ring platform, 604-base, 7-flash nozzle, 8-fixing rod I, 9-temperature probe and 10-pressure probe.
Detailed Description
The present invention is further described with reference to the following drawings and examples, but the present invention is not limited thereto in any way, and any modification or improvement based on the teaching of the present invention is within the protection scope of the present invention.
As shown in fig. 1 to 4, the utility model discloses a flash tank 1, microwave feeder 2, inlet 3, liquid outlet 4, extraction steam vent 5, sieve tray 6, microwave feeder 2 is fixed to be set up in the lateral wall of flash tank 1, top or bottom, the fixed liquid outlet 4 that is provided with inlet 3 and bottom in the top of flash tank 1, the fixed extraction steam vent 5 that is provided with in top or the side upper portion of flash tank 1, be provided with at least one deck sieve tray 6 in 3 below of inlet in flash tank 1.
The sieve tray 6 is made of wave-permeable polytetrafluoroethylene, ceramic or corundum, or is made of wave-absorbing silicon carbide or carbon material, or is made of metal material; the disk surface of the sieve disk 6 is horizontally arranged and is provided with a plurality of sieve pores 601 with small diameters.
The disc surface edge of the sieve tray 6 is provided with a flange 602, and at least two layers of sieve trays 6 and coaxial arrangement between layers are arranged below the liquid inlet 3 in the flash tank 1.
And a flash nozzle 7 is fixedly arranged above the sieve tray 6 at the central axis in the flash tank 1.
The sieve tray 6 is fixed to be set up in the dead lever I8 that upwards extends from 1 bottom of flash tank, fixed the inner wall that sets up in flash tank 1 or fixed the dead lever II that sets up in 1 top downwardly extending from the flash tank.
The bottom surface of the sieve tray 6 is of a centrosymmetric downward convex arc-shaped surface structure or a centrosymmetric inverted cone structure, and the sieve holes 601 are fixedly provided with coaxial downward convex annular platforms 603 on the bottom surface of the sieve tray 6.
At least two diversion sieve holes are uniformly distributed on the disc surface of the sieve disc 6 along the center, and the diversion sieve holes of the adjacent sieve discs 6 in the flash tank 1 are arranged in a staggered manner; the diameter of the diversion sieve mesh can be adjusted within 0.5-5 mm according to the viscosity and surface tension change of the treated feed liquid or/and the residence time requirement.
The flash tank 1 comprises an upper metal cover 101 and a flash tank body 102, wherein the upper metal cover 101 is arranged at the upper end of the cylindrical flash tank body 102, the lower ends of the upper metal cover 101 and the flash tank body 102 are both of inner arc structures and mutually form a symmetrical confocal concave cavity, and the symmetrical confocal concave cavity and the cylindrical middle part of the flash tank body 102 are fixedly connected in an equal-diameter closed manner to form a multi-mode cavity.
A lower end enclosure 103 is arranged at the bottom of the flash tank body 102, and the upper metal cover 101 and the lower end enclosure 103 are spherical, ellipsoidal, truncated cone-shaped or planar; the flash tank 1 is placed vertically or horizontally, and the liquid inlet 3 and the liquid outlet 4 are respectively arranged at the upper part and the lower part of the flash tank 1 when the flash tank is placed horizontally.
And heat insulation layers are arranged on the side wall and the upper and lower ends of the flash tank 1.
The wall of the flash tank 1 is provided with a temperature probe 9 and/or a pressure probe 10 extending into the cavity, the temperature probe 9 and the pressure probe 10 are respectively and electrically connected with an input port of the control system, and a magnetron and/or an extraction pump of the flash tank 1 are respectively and electrically connected with an output port of the control system.
The jar wall of flash tank 1 is provided with glass or quartzy hole of keeping watch on, glass or quartzy hole of keeping watch on is covered with a layer of metal fine mesh.
The liquid inlet of the flash tank is heated at room temperature or by an external traditional energy source, electric energy or microwave energy device.
The utility model discloses theory of operation and working process:
the utility model discloses an at least one deck sieve tray not only can effectively improve the area that the falling film flows, but also can disperse the liquid drop into the liquid drop that the wave absorption nature is good when the microwave flash distillation, and thin layer liquid film on the sieve tray is added for gas-liquid specific surface area promotes by a wide margin, thereby can show to increase evaporation phase interfacial area, improves heat exchange efficiency; the sieve tray can make the feed liquid enter into the dwell time of outflow from the inlet and can reach several minutes ~ tens of minutes, can show the residence evaporation time who improves the feed liquid, the microwave can improve the feed liquid temperature by dozens of degrees gradually in this in-process to greatly improve evaporation efficiency, make through the utility model discloses a single-stage evaporation just can reach the discharge flow and the higher target of light component content at flash tank top, compare multistage flash distillation structure comparatively simple, and equipment flow is short, investment cost is low, still effectively avoid the calorific loss of multistage flash distillation material high temperature circulation in-process pump and pipeline, whole energy consumption is lower; the sieve tray is made of wave-transparent materials, microwaves can penetrate through the sieve tray to directly heat a target solution, energy consumption is low, the sieve tray is made of wave-absorbing materials, feed liquid and the sieve tray can be heated simultaneously through the microwaves, and the sieve tray exchanges heat with the feed liquid again, so that heat efficiency is high; the material liquid obtains latent heat by directly receiving microwave energy in the sieve tray made of wave-transparent material, so that the heat exchange efficiency is high, the sieve tray only increases the evaporation phase interface area and the retention evaporation time of the material liquid in the flash tank, and compared with flash evaporation equipment in the prior art, a heat exchange surface is cancelled, so that scaling can be prevented, and later maintenance is easy; the continuous latent heat acquisition of the material liquid in the flash tank is kept through microwaves, so that the dynamic continuous evaporation process can be realized. Furthermore, the disc surface of the sieve disc is horizontally arranged and provided with a plurality of sieve pores with small diameters, and the horizontal disc surface can enable feed liquid to form a thin-layer liquid film on the sieve disc, so that the gas-liquid specific surface area is greatly improved, and the evaporation phase interfacial area can be obviously increased; and the disk surface is provided with a plurality of small-diameter sieve pores, so that liquid drops can be dispersed into liquid drops with good wave absorption property during microwave flash evaporation, and the liquid drops can absorb microwave energy to improve the heat exchange efficiency. Furthermore, the sieve trays in the flash tank are coaxially arranged among layers, so that liquid drops falling from the upper layer can continuously form a thin-layer liquid film on the sieve tray at the lower layer, and cannot directly fall into the bottom, and the retention and evaporation time of the liquid material is effectively prolonged to improve the evaporation efficiency; the quotation edge of screen tray is provided with the flange, can make the screen tray form certain stock solution space to do benefit to and form the thin layer liquid film. Furthermore, the bottom surface of the sieve tray is in a central symmetrical downward convex arc surface structure or a central symmetrical inverted cone structure, so that the lower-layer vapor phase flow can be guided; the sieve pores are fixedly provided with the coaxial downward convex ring platforms on the bottom surface of the sieve tray, so that the bottom surface of the sieve tray can guide the vapor phase flow of the lower layer, and the feed liquid on the upper layer can form liquid drops with good wave absorption. Furthermore, at least two diversion sieve holes are uniformly distributed on the disc surface of the sieve disc along the center, and the diversion sieve holes of the adjacent sieve discs in the flash tank are arranged in a staggered manner, so that the guide effect on the flow of the lower-layer vapor phase can be formed. Furthermore, the upper metal cover of the flash tank and the bottom of the flash tank body mutually form a symmetrical confocal concave cavity and are fixedly connected with the cylindrical waveguide tube in an equal-diameter closed manner to form a multi-mode perturbation cavity, the additional loss of the inner wall is small, and meanwhile, the number of resonance modes in the cavity can be obviously increased, so that the uniformity of field distribution in the cavity is improved, the temperature difference in the falling film flowing process is effectively reduced, and the thermodynamic efficiency of microwave flash evaporation is improved. Furthermore, the side wall and the upper and lower ends of the flash tank are provided with heat insulation layers, so that heat loss can be reduced; the wall of the flash tank is provided with a temperature probe and/or a pressure probe which extend into the cavity and are electrically connected with an input port of the control system, and a magnetron and/or a steam extraction pump of the flash tank are respectively electrically connected with an output port of the control system; the evaporation process can be monitored in time, the microwave feed-in power can be controlled according to temperature change, and the starting and stopping of the vacuum pump or the power adjustment can be controlled according to pressure change. Furthermore, the tank wall of the flash tank is provided with a glass or quartz monitoring hole so as to observe the flow state of liquid drops in the flash chamber, the generation speed of steam and the like; the glass or quartz monitoring hole is covered with a layer of metal fine net to prevent microwave leakage. To sum up, the utility model has the characteristics of simple structure, evaporation efficiency height, energy consumption are low, can dynamic continuous evaporation.
As shown in fig. 1 to 4, in operation, the flash tank 1 is vacuumized by a vacuum pump arranged outside the tank, the feed liquid is sprayed on the first layer of sieve tray 6 in the flash tank 1 from the liquid inlet 3 through the flash nozzle 7, the feed liquid forms a thin liquid film on the sieve tray 6, meanwhile, under the action of self-gravity, liquid drops formed along the sieve holes 601 fall into the next layer of sieve tray 6, the feed liquid forms falling film flow on the tray surface and the bottom surface of the sieve tray 6, thereby prolonging the stroke of the falling film flow and further increasing the evaporation phase interface area, so that the temperature of the liquid film is gradually increased from top to bottom under the action of microwave energy, light components in the feed liquid are vaporized into steam, the steam rises and is led out from the steam extraction port 5, and the liquid phase falling to the lowest layer of sieve tray 6 falls into the bottom of the flash tank 1 from the gap or through hole between the base 604 at the bottom of the sieve tray 6 and the; when the microwave energy collecting device works, after microwave energy emitted by a magnetron is fed into a flash evaporation cavity of the flash evaporation tank 1 through the microwave feed port 2, the microwave can be reflected back and forth between symmetrical confocal concave cavities which are formed by the metal conductors of the upper metal cover 101 and the metal lower end socket 103, so that most of the microwave energy is gathered to a central area in space, the number of resonance modes in the flash evaporation cavity is increased, the uniformity of field distribution in the flash evaporation cavity is improved, and the microwave evaporation efficiency is improved. The control system obtains the temperature of the upper part or the top of the flash tank 1, the measurement data of the pressure probe and the measurement data of the temperature probe at the bottom of the flash tank, and adjusts the power of the magnetron and the rotating speed and the liquid supply amount of the steam extraction pump according to the measured temperature and pressure, thereby ensuring the flash evaporation concentration process to be in the optimal state.
Claims (10)
1. The utility model provides a feed liquid is with thin layer and droplet stream motion's microwave enhancement continuous flash system, its characterized in that includes flash tank (1), microwave feeder (2), inlet (3), liquid outlet (4), extraction port (5), sieve tray (6), microwave feeder (2) are fixed to be set up in lateral wall, top or the bottom of flash tank (1), the fixed liquid outlet (4) that are provided with inlet (3) and bottom in top of flash tank (1), the top or the side upper portion of flash tank (1) are fixed and are provided with extraction port (5), flash tank (1) inherent inlet (3) below is provided with at least one deck sieve tray (6).
2. The microwave-enhanced continuous flash system according to claim 1, wherein the sieve tray (6) is made of wave-permeable polytetrafluoroethylene, ceramic or corundum, or is made of wave-absorbing silicon carbide or carbon material, or is made of metal material; the disk surface of the sieve disk (6) is horizontally arranged and is provided with a plurality of sieve pores (601) with small diameters.
3. The microwave-enhanced continuous flash evaporation system according to claim 2, wherein the edge of the plate surface of the sieve plate (6) is provided with a flange (602), and at least two layers of sieve plates (6) are arranged in the flash tank (1) below the liquid inlet (3) and are coaxially arranged among the layers.
4. The microwave-enhanced continuous flash system according to claim 2, wherein a flash nozzle (7) is fixedly arranged above the sieve tray (6) at the central axis inside the flash tank (1).
5. The microwave-enhanced continuous flash system as claimed in claim 2, 3 or 4, wherein the sieve tray (6) is fixedly arranged on a fixing rod I (8) extending upwards from the bottom of the flash tank (1), fixedly arranged on the inner wall of the flash tank (1) or fixedly arranged on a fixing rod II extending downwards from the top of the flash tank (1).
6. The microwave-enhanced continuous flash evaporation system according to claim 5, wherein the bottom surface of the sieve tray (6) is of a centrosymmetric downward convex arc-shaped surface structure or a centrosymmetric inverted cone-shaped structure, and the sieve holes (601) are fixedly provided with coaxial downward convex ring platforms (603) on the bottom surface of the sieve tray (6).
7. The microwave-enhanced continuous flash evaporation system according to claim 5, wherein at least two guide screen holes are uniformly distributed on the surface of the screen tray (6) along the center, and the guide screen holes of the adjacent screen trays (6) in the flash tank (1) are arranged in a staggered manner; the diameter of the diversion sieve mesh can be adjusted within 0.5-5 mm according to the viscosity and surface tension change of the treated feed liquid or/and the residence time requirement.
8. The microwave-enhanced continuous flash evaporation system according to claim 5, wherein the flash tank (1) comprises an upper metal cover (101) and a flash tank body (102), the upper metal cover (101) is disposed at the upper end of the cylindrical flash tank body (102), and the lower ends of the upper metal cover (101) and the flash tank body (102) are both of an inner arc structure and mutually form a symmetrical confocal concave cavity and are fixedly connected with the cylindrical middle part of the flash tank body (102) in an equal-diameter closed manner to form a multi-mode cavity.
9. The microwave-enhanced continuous flash evaporation system of claim 8, wherein a lower seal head (103) is arranged at the bottom of the flash evaporation tank body (102), and the upper metal cover (101) and the lower seal head (103) are spherical, ellipsoidal, truncated cone-shaped or planar; the flash tank (1) is placed vertically or horizontally, and the liquid inlet (3) and the liquid outlet (4) are respectively arranged at the upper part and the lower part of the flash tank (1) when the flash tank is placed horizontally.
10. The microwave-enhanced continuous flash evaporation system according to claim 8, wherein the side wall and the upper and lower ends of the flash tank (1) are provided with insulating layers; the wall of the flash tank (1) is provided with a temperature probe and/or a pressure probe which extend into the cavity, the temperature probe and the pressure probe are respectively and electrically connected with an input port of the control system, and a magnetron and/or an extraction pump of the flash tank (1) are respectively and electrically connected with an output port of the control system; the tank wall of flash tank (1) is provided with glass or quartzy hole of keeping watch on, glass or quartzy hole of keeping watch on is covered with a layer of metal fine mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920768149.2U CN210159224U (en) | 2019-05-27 | 2019-05-27 | Microwave-enhanced continuous flash evaporation system for moving feed liquid in thin layer and liquid drop flow mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920768149.2U CN210159224U (en) | 2019-05-27 | 2019-05-27 | Microwave-enhanced continuous flash evaporation system for moving feed liquid in thin layer and liquid drop flow mode |
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| Publication Number | Publication Date |
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| CN210159224U true CN210159224U (en) | 2020-03-20 |
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| CN201920768149.2U Expired - Fee Related CN210159224U (en) | 2019-05-27 | 2019-05-27 | Microwave-enhanced continuous flash evaporation system for moving feed liquid in thin layer and liquid drop flow mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064220A (en) * | 2019-05-27 | 2019-07-30 | 昆明理工大学 | A kind of microwave reinforced successive flash vaporization system that feed liquid is moved with thin layer and drop stream |
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- 2019-05-27 CN CN201920768149.2U patent/CN210159224U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064220A (en) * | 2019-05-27 | 2019-07-30 | 昆明理工大学 | A kind of microwave reinforced successive flash vaporization system that feed liquid is moved with thin layer and drop stream |
| CN110064220B (en) * | 2019-05-27 | 2024-06-14 | 昆明理工大学 | Microwave enhanced continuous flash evaporation system for feed liquid moving in thin layer and liquid drop flow |
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Granted publication date: 20200320 |