CN112337114A - Heat-carrying-gas-driven supergravity enhanced evaporation device and method - Google Patents
Heat-carrying-gas-driven supergravity enhanced evaporation device and method Download PDFInfo
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- CN112337114A CN112337114A CN202011141218.0A CN202011141218A CN112337114A CN 112337114 A CN112337114 A CN 112337114A CN 202011141218 A CN202011141218 A CN 202011141218A CN 112337114 A CN112337114 A CN 112337114A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/14—Evaporating with heated gases or vapours or liquids in contact with the liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D1/30—Accessories for evaporators ; Constructional details thereof
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Abstract
A supergravity enhanced evaporation device driven by heat-carrying gas and a method thereof belong to the technical field of evaporation and can solve the problems of high cost, large occupied area, easy blockage and the like of the existing evaporation equipment. The high-speed and high-efficiency supergravity evaporation technology carries out direct contact heat exchange evaporation in supergravity equipment, has simple process, realizes sensitive control on temperature and enhances the controllability of operability. The hypergravity equipment has low cost, high heat exchange efficiency, small occupied area and convenient start and stop. Flue gas and the like can be used as heat sources for heat recovery; the evaporated solvent is recovered, and the method has good economic benefit.
Description
Technical Field
The invention belongs to the technical field of evaporation, and particularly relates to a supergravity enhanced evaporation device and method driven by heat-carrying gas.
Background
The core of the supergravity technology is a rotating packed bed, and a supergravity field is simulated by centrifugal force generated by fast rotating packing in the rotating packed bed so as to strengthen the transfer and mixing processes. Has the advantages of good mass transfer effect, short retention time, small liquid holdup, easy start and stop, small equipment volume and the like. The rotating packing replaces a vertical and static packing tower, so that gas-liquid two phases are fully contacted in the rotating packing layer, and thus mass transfer and heat transfer are completed. It has wide application range, and may be used in mass transfer and separation process as well as reaction process. Liquid is continuously dispersed and sheared in the filler, so that the surface renewal speed is improved, meanwhile, the turbulence degree of a gas-liquid phase is increased, and the heat transfer and mass transfer are enhanced.
In engineering, the unit operation in which a solution containing a non-volatile solute (usually a solid) is concentrated in a boiling state by heating is called evaporation, and an apparatus for performing the evaporation process is called an evaporator. The traditional evaporation technology adopts an indirect contact mode to evaporate, the heat transfer effect is limited, and the problems of easy scaling, high energy consumption, high cost, easy corrosion and the like exist at the same time. The research focus of many scholars is evaporation equipment, aims at improving heat transfer area, interface updating speed and the like, and brings much attention to direct contact heat exchange evaporation.
The supergravity direct contact evaporation technology adopts a gas-liquid direct contact mode to exchange heat, the heat-carrying gas and the solution directly exchange heat, and the heat transfer process is rapid. Because the filler rotating at high speed has high shearing effect on the solution, the solution is divided into an extremely thin liquid film and fine liquid drops with a certain linear velocity. The gas passes through the gaps in the packing layer which is rotated at high speed, bent, narrow and changeable and filled with the extremely thin liquid film and the fine liquid drops, the collision contact between the gas and the solution and the packing is increased, the thickness of the liquid film is reduced, the total heat transfer surface area is the sum of the area of the packing and the area of the liquid film, the heat transfer coefficient is improved, and the heat transfer and mass transfer processes are enhanced.
The supergravity direct contact evaporation technology does not need to be provided with a heat exchange surface, can greatly improve the heat transfer coefficient, has the energy-saving advantage and is more economical; the continuous operation is easy for slurry treatment, the temperature is easier to control, and the treatment efficiency is higher.
Chinese patent CN104689584A discloses a supergravity field enhanced evaporation system driven by a heat pump, which uses heat pump technology to realize heating and refrigeration of the system, and utilizes supergravity rotating field and liquid to heat circulating gas in an evaporation chamber to improve gas moisture carrying capacity, and is provided with independent regenerative dehumidification equipment, thereby saving more energy and reducing evaporation temperature. However, a multistage backheating dehumidifier, a dehumidifying packed tower and the like are required to be arranged, a heat pump technology is required to be applied, the flow is complex, scaling is easy to occur, and the method is not suitable for treating high-viscosity liquid. In contrast, the invention only needs air heating equipment or heat recycling equipment, thereby reducing the input of steam heat sources; on the other hand, the hot-carrying gas does not carry out closed circulation, and the wet air does not need to be dehumidified and recycled, so that the investment of equipment is reduced, the process is simpler, and the applicability is stronger.
Chinese patent CN104707350B discloses a steam-driven supergravity field enhanced evaporation system, which mainly utilizes the principle that the escape kinetic energy of water molecules increases with the increase of temperature, so that the high-temperature solution and the atmosphere perform heat and mass transfer to improve the moisture content of the air at the outlet. The problems exist that the solution needs to be preheated to high temperature, the energy consumption is large, and the solution is not suitable for low-temperature evaporation and evaporation of heat-sensitive substances. In contrast, the invention uses high-temperature gas and normal-temperature liquid for heat exchange evaporation, can realize evaporation of low-temperature and heat-sensitive substances, and has less energy consumption for preheating air.
Chinese patent CN206219256U discloses a high gravity field enhanced wastewater evaporation tower, in which a wire mesh demister, a liquid distributor, a structured packing, a liquid redistributor and a gas distributor are sequentially arranged from top to bottom in a tower body. The waste water falls into the regular packing under the action of self gravity through the liquid distributor, and contacts with hot air from the bottom, so that the contact area is enlarged, the evaporation of water is accelerated, and the falling speed is delayed. The problem exists that the filler in the patent is static, the supergravity environment cannot be realized, and the enhanced evaporation effect is limited. In contrast, the motor is used for driving the filler to rotate to form a supergravity field, gas and liquid are atomized and contacted, and the heat transfer evaporation efficiency is higher; it can not only evaporate and treat waste water, but also can be used for solution concentration, etc.
Disclosure of Invention
Aiming at the problems of high cost, large occupied area, easy blockage and the like of the existing evaporation equipment, the invention provides a rapid and efficient evaporation technology, which realizes direct contact heat exchange evaporation in a supergravity environment, can obtain larger mass transfer coefficient and heat transfer coefficient, reduces energy consumption, improves the efficiency of evaporation concentration, and achieves the purposes of saving energy, reducing emission and reducing consumption.
The invention adopts the following technical scheme:
the utility model provides a device of evaporation is reinforceed to heat-carrying gas driven hypergravity, including rotatory packed bed, the air-blower, the air buffer tank, air heater, reservoir I, reservoir II, reservoir III and condensing equipment, the air outlet of air-blower and the entry linkage of air buffer tank, the export of air buffer tank passes through valve and gas flowmeter and air heater's entry linkage, air heater's export is connected with the air inlet of rotatory packed bed, reservoir II passes through the pump, valve and liquid flowmeter are connected with the inlet of rotatory packed bed, the gas outlet of rotatory packed bed passes through condensing equipment and is connected with reservoir III, the liquid outlet and the reservoir I of rotatory packed bed are connected.
The rotary packed bed is of a vertical or horizontal structure.
The packing in the rotary packed bed is a wire mesh, a corrugated mesh, a porous plate or regular packing.
A heat carrier gas driven supergravity enhanced evaporation method comprises the following steps:
firstly, heating gas blown in by a blower into heat-carrying gas by an air heater, respectively and continuously introducing the heat-carrying gas and solution into a rotary packed bed, and directly contacting the solution and the heat-carrying gas in the rotary packed bed for heat exchange and evaporation;
and secondly, adjusting operation parameters to evaporate: the solution is sprayed to the inner edge of the filler of the rotating packed bed through a nozzle of a liquid distributor of the rotating packed bed, flows to the outer edge along the pore space of the filler under the action of centrifugal force, is directly contacted with heat-carrying gas in a high gravity field, the solution is rapidly heated, part of the solvent is gasified, and the solution is concentrated into a saturated or sub-saturated state;
thirdly, discharging the saturated or sub-saturated solution from a liquid outlet of the rotary packed bed;
and fourthly, discharging the gasified solvent from an exhaust port of the rotating packed bed along with the heat-carrying gas, and recovering the solvent through a post-treatment device.
The contacting form of the hot carrier gas and the solution comprises any one of countercurrent flow, cross-current flow and concurrent flow.
The heat carrier gas comprises any one of flue gas, air, carbon dioxide, fuel gas and nitrogen.
The invention has the following beneficial effects:
the invention divides the solution into an extremely thin liquid film and fine liquid drops with certain linear velocity by adjusting the rotating speed of the rotating packed bed and the high shearing action of the high-speed rotating packing on the solution, increases the gas-liquid contact area and strengthens the collision contact of the hot-carrying gas and the solution, simultaneously reduces the thickness of the liquid film, increases the average temperature difference and improves the heat transfer coefficient.
The high-speed and high-efficiency supergravity evaporation technology carries out direct contact heat exchange evaporation in supergravity equipment, has simple process, realizes sensitive control on temperature and enhances the controllability of operability. The hypergravity equipment has low cost, high heat exchange efficiency, small occupied area and convenient start and stop. Flue gas and the like can be used as heat sources for heat recovery; the evaporated solvent is recovered, and the method has good economic benefit.
The invention can be used for concentrating liquid, preparing or recovering pure solvent, treating waste water and evaporating to obtain solute crystal, etc.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic view of the operating principle of the rotating packed bed of the present invention;
wherein: 1-rotating a packed bed; 2-a blower; 3-an air buffer tank; 4-an air heater; 5-reservoir I; 6-liquid storage tank II; 7-reservoir III; 8-a condensing device; 9-a valve; 10-a gas flow meter; 11-an air inlet; 12-a pump; 13-a liquid flow meter; 14-a liquid inlet; 15-air outlet; 16-liquid outlet.
Detailed Description
The invention is further explained with reference to the accompanying drawings.
As shown in the figure, a device of evaporation is reinforceed to heat-carrying gas driven hypergravity, including rotatory packed bed, the air-blower, the air buffer tank, air heater, reservoir I, reservoir II, reservoir III and condensing equipment, the air outlet of air-blower and the entry linkage of air buffer tank, the export of air buffer tank passes through valve and gas flowmeter and air heater's entry linkage, air heater's export is connected with the air inlet of rotatory packed bed, reservoir II passes through the pump, valve and liquid flowmeter are connected with the inlet of rotatory packed bed, the gas outlet of rotatory packed bed passes through condensing equipment and is connected with reservoir III, the liquid outlet and the reservoir I of rotatory packed bed are connected.
A supergravity enhanced evaporation method driven by heat carrier gas is characterized in that: the method comprises the following steps:
firstly, heating gas blown in by a blower into heat-carrying gas by an air heater, respectively and continuously introducing the heat-carrying gas and solution into a rotary packed bed, and directly contacting the solution and the heat-carrying gas in the rotary packed bed for heat exchange and evaporation;
and secondly, adjusting operation parameters to evaporate: the solution is sprayed to the inner edge of the filler of the rotating packed bed through a nozzle of a liquid distributor of the rotating packed bed, flows to the outer edge along the pore space of the filler under the action of centrifugal force, is directly contacted with heat-carrying gas in a high gravity field, the solution is rapidly heated, part of the solvent is gasified, and the solution is concentrated into a saturated or sub-saturated state;
thirdly, discharging the saturated or sub-saturated solution from a liquid outlet of the rotary packed bed;
and fourthly, discharging the gasified solvent from an exhaust port of the rotating packed bed along with the heat-carrying gas, and recovering the solvent through a post-treatment device.
Example 1
High-temperature flue gas driven supergravity enhanced evaporation of sodium chloride solution: high-temperature flue gas with the temperature of 250 ℃ and a dilute sodium chloride solution are continuously introduced into a vertical supergravity device, a cross-flow rotating packed bed is selected, a packing layer is a pall ring packing, and the rotating speed is set to be 1000 r/min. The dilute sodium chloride solution is sprayed to the inner edge of the packing layer of the rotary packed bed through the nozzle of the liquid distributor, flows to the outer edge along the packing pores under the action of centrifugal force, and the high-temperature flue gas is directly contacted with the dilute sodium chloride solution in a high-gravity field. The dilute sodium chloride solution is heated rapidly, part of water is gasified, the solution is concentrated into a saturated state rapidly, and the saturated solution is discharged from a liquid outlet of the supergravity device. The temperature of the high-temperature flue gas is reduced after heat exchange with the dilute sodium chloride solution, the high-temperature flue gas is discharged from an exhaust port of the supergravity device, and the evaporated water is recovered by a post-treatment device. Through calculation, the heat exchange area is improved by 50% compared with the traditional technology, the heat transfer efficiency is improved by 25%, and the energy consumption is saved by 25% compared with the traditional technology.
Example 2
Hot air driven supergravity enhanced evaporation concentration of dilute caustic soda solution: hot air at 300 ℃ and a dilute caustic soda solution are continuously introduced into a horizontal supergravity device, a countercurrent rotating packed bed is selected, a packing layer is a wire mesh packing, and the rotating speed is set to be 800 r/min. The hot air directly contacts with the dilute caustic soda solution on the wire mesh filler, the solution is quickly heated, part of water is gasified, and the solution is discharged from a solution outlet of the supergravity device after being quickly concentrated. Hot air and gasified moisture are discharged from an exhaust port of the supergravity device, and water is recovered by the post-treatment device, so that the energy consumption is saved by 25 percent by the technology.
Example 3
The technology is used for evaporating and treating high-salinity wastewater, the sodium chloride content in the water is about 200 g/L, and the COD is about 500 mg/L. High-temperature flue gas with the temperature of 300 ℃ and high-salinity wastewater are continuously introduced into a vertical supergravity device, a cross-flow rotating packed bed is selected, a packing layer is a regular packing, and the rotating speed is set to be 1000 r/min. Flue gas and waste water are directly contacted in a high gravity field, and high-salinity waste water is quickly concentrated. The water vapor is discharged from the exhaust port of the supergravity device along with the flue gas, condensed and recovered. The equipment runs stably, the heat exchange area is improved by 50 percent compared with the traditional technology, and the energy consumption is saved by 30 percent compared with the traditional technology.
Claims (6)
1. The utility model provides a device that evaporation is reinforceed to super gravity of heat-carrying gas driven which characterized in that: comprises a rotary packed bed (1), a blower (2), an air buffer tank (3), an air heater (4), a liquid storage tank I (5), a liquid storage tank II (6), a liquid storage tank III (7) and a condensing device (8), the air outlet of air-blower (2) and the entry linkage of air buffer tank (3), the export of air buffer tank (3) is through valve (9) and gas flowmeter (10) and the entry linkage of air heater (4), the export of air heater (4) is connected with the air inlet of rotatory packed bed (1), reservoir II (6) are through pump (12), valve and liquid flowmeter (13) are connected with the inlet of rotatory packed bed (1), the gas outlet of rotatory packed bed (1) is passed through condensing equipment (8) and is connected with reservoir III (7), the liquid outlet and reservoir I (5) of rotatory packed bed (1) are connected.
2. The heat carrier gas driven supergravity enhanced evaporation device according to claim 1, wherein: the rotary packed bed (1) is of a vertical or horizontal structure.
3. The heat carrier gas driven supergravity enhanced evaporation device according to claim 1, wherein: the packing in the rotary packed bed (1) is a wire mesh, a corrugated mesh, a perforated plate or regular packing.
4. A supergravity enhanced evaporation method driven by heat carrier gas is characterized in that: the method comprises the following steps:
firstly, heating gas blown in by a blower into heat-carrying gas by an air heater, respectively and continuously introducing the heat-carrying gas and solution into a rotary packed bed, and directly contacting the solution and the heat-carrying gas in the rotary packed bed for heat exchange and evaporation;
and secondly, adjusting operation parameters to evaporate: the solution is sprayed to the inner edge of the filler of the rotating packed bed through a nozzle of a liquid distributor of the rotating packed bed, flows to the outer edge along the pore space of the filler under the action of centrifugal force, is directly contacted with heat-carrying gas in a high gravity field, the solution is rapidly heated, part of the solvent is gasified, and the solution is concentrated into a saturated or sub-saturated state;
thirdly, discharging the saturated or sub-saturated solution from a liquid outlet of the rotary packed bed;
and fourthly, discharging the gasified solvent from an exhaust port of the rotating packed bed along with the heat-carrying gas, and recovering the solvent through a post-treatment device.
5. The method of claim 4, wherein the evaporation is enhanced by the supergravity driven by the heating medium, and the method comprises the following steps: the contacting form of the hot carrier gas and the solution comprises any one of countercurrent flow, cross-current flow and concurrent flow.
6. The method of claim 4, wherein the evaporation is enhanced by the supergravity driven by the heating medium, and the method comprises the following steps: the heat carrier gas comprises any one of flue gas, air, carbon dioxide, fuel gas and nitrogen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011141218.0A CN112337114A (en) | 2020-10-22 | 2020-10-22 | Heat-carrying-gas-driven supergravity enhanced evaporation device and method |
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| CN202011141218.0A CN112337114A (en) | 2020-10-22 | 2020-10-22 | Heat-carrying-gas-driven supergravity enhanced evaporation device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105400A (en) * | 2021-07-15 | 2022-03-01 | 北京科技大学 | Integrated device for separating black water from treatment source |
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| CN104474996A (en) * | 2014-11-22 | 2015-04-01 | 中北大学 | Multistage cross-flow rotation packed bed mass transfer and reaction equipment |
| CN104689584A (en) * | 2015-03-17 | 2015-06-10 | 南京工业大学 | Heat pump driven supergravity field enhanced evaporation system |
| CN104707350A (en) * | 2015-03-17 | 2015-06-17 | 南京工业大学 | Steam-driven supergravity field enhanced evaporation system |
| CN206219256U (en) * | 2016-11-04 | 2017-06-06 | 南京南化建设有限公司 | Super gravity field strengthens waste water evaporating column |
| CN110642321A (en) * | 2019-08-27 | 2020-01-03 | 中北大学 | Supergravity-enhanced dry-method denitration ammonia production device |
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2020
- 2020-10-22 CN CN202011141218.0A patent/CN112337114A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN104474996A (en) * | 2014-11-22 | 2015-04-01 | 中北大学 | Multistage cross-flow rotation packed bed mass transfer and reaction equipment |
| CN104689584A (en) * | 2015-03-17 | 2015-06-10 | 南京工业大学 | Heat pump driven supergravity field enhanced evaporation system |
| CN104707350A (en) * | 2015-03-17 | 2015-06-17 | 南京工业大学 | Steam-driven supergravity field enhanced evaporation system |
| CN206219256U (en) * | 2016-11-04 | 2017-06-06 | 南京南化建设有限公司 | Super gravity field strengthens waste water evaporating column |
| CN110642321A (en) * | 2019-08-27 | 2020-01-03 | 中北大学 | Supergravity-enhanced dry-method denitration ammonia production device |
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| CN114105400A (en) * | 2021-07-15 | 2022-03-01 | 北京科技大学 | Integrated device for separating black water from treatment source |
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