CN111617505A - Mechanical auxiliary self-cleaning evaporation concentrator and evaporation concentration method - Google Patents
Mechanical auxiliary self-cleaning evaporation concentrator and evaporation concentration method Download PDFInfo
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- CN111617505A CN111617505A CN202010302364.0A CN202010302364A CN111617505A CN 111617505 A CN111617505 A CN 111617505A CN 202010302364 A CN202010302364 A CN 202010302364A CN 111617505 A CN111617505 A CN 111617505A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/06—Evaporators with vertical tubes
- B01D1/12—Evaporators with vertical tubes and forced circulation
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a mechanical auxiliary self-cleaning evaporation concentrator and an evaporation concentration method. The invention fundamentally solves the scaling problem in the production and operation of the evaporation concentration device, thereby achieving the purposes of no scaling, no blockage and keeping the high-efficiency and energy-saving operation of the evaporation concentration device in the operation process.
Description
Technical Field
The invention relates to the field of chemical equipment, in particular to a mechanical auxiliary self-cleaning evaporation concentrator and an evaporation concentration method.
Background
Evaporation equipment is used as common equipment in the fields of chemical industry, metallurgy, food and beverage, pharmacy and the like in China, and is widely applied. The evaporation concentration device heats the solvent-containing material solution through heat energy (steam, electric energy and the like) to evaporate a part of the solvent in a steam state, and finally the thick material is obtained.
The evaporation concentration equipment is generally applied in the field of aqueous solution containing inorganic salt and organic salt, the final purpose of the evaporation concentration equipment is to realize the thickening of water-containing materials, the most serious problem of the evaporation concentration equipment in China is scaling in the actual operation, calcium sulfate, calcium carbonate, insoluble silicon compounds and the like are easily formed on the surface of a heater, a pipeline and other parts during the operation of the evaporation concentration equipment due to the fact that the water-containing solution contains calcium ions, magnesium ions, silicon ions and the like, the formed scales are easy to form on the surface of the heater, the pipeline and other parts, and further the heat exchange efficiency of the evaporation concentration equipment is reduced, the heater, the pipeline and the like are blocked, so that the series of problems of low equipment operation efficiency, blockage, high equipment shutdown.
According to incomplete statistics of relevant scientific research units in China, when evaporation concentration equipment is in operation, dirt on the surface of a heater is gradually increased and thickened, the scaling forms mainly comprise calcium sulfate, calcium carbonate, silicon compounds, part of doped organic dirt and the like, dirt substances are deposited on the wall surface of the heating equipment of the evaporation concentration equipment, the heat exchange efficiency is greatly reduced, theoretically, the heat exchange coefficient of the heater is approximately reduced by about 8% when the thickness of the dirt on the surface of the evaporation concentration heater is increased by 1 mm, meanwhile, the energy consumption is increased by more than 9%, economic loss and energy consumption caused by scaling problems of evaporation concentration devices in China are large, and according to rough estimation, the economic loss accounts for about 0.03% of industrial GDP.
In order to prevent the evaporation concentration system from scaling, the prior art mainly removes calcium, magnesium and silicon in water by a chemical method, common medicaments are sodium hydroxide, sodium carbonate, magnesium salts and the like, the medicaments are high in consumption and high in price, and softened solution generates a large amount of solid waste, so that the operation cost of industrial production and the environmental protection cost are increased.
In summary, the anti-scaling problem of the evaporation concentrator is a difficult problem in the fields of chemical industry and the like in China, and a device and a technical solution capable of solving the difficult problem are urgently needed.
Disclosure of Invention
The invention aims to fundamentally solve the scaling problem in the production and operation of the evaporation and concentration device, thereby achieving the purposes of no scaling, no blockage and keeping the efficient and energy-saving operation of the evaporation and concentration device in the operation process.
Aiming at the technical problem, the invention provides a mechanical auxiliary self-cleaning evaporation concentrator and an evaporation concentration method.
The technical scheme for solving the technical problems is as follows: a mechanical auxiliary self-cleaning evaporation concentrator comprises an evaporation tank 1, a circulating pump 2, a tube heat exchanger 3, a particle circulating tube 4, a feed liquid circulating tube 5, a particle adjusting valve 6, a guide cylinder 9, a reflux cylinder 10, a vapor-liquid separator 11 and a mixing tube 12.
The circulating pump 2 is arranged in the feed liquid circulating pipe 5, one end of the feed liquid circulating pipe 5 is connected with a mixing pipe 12 connected with the bottom of the tube heat exchanger 3, the other end is connected with the bottom side wall of the evaporating pot 1 and extends to the inside of the evaporating pot 1, the reflux drum 10 is connected with a pipeline extending from the feed liquid circulating pipe 5 to the inside of the evaporation tank 1 and is opened upwards, the bottom of the particle circulating pipe 4 is connected with the side wall of the bottom mixing pipe 12 of the tube heat exchanger 3, the top of the particle circulating pipe 4 is connected with the bottom of the evaporation tank 1, a particle regulating valve 6 is arranged in the particle circulating pipe 4, the top of the tubular heat exchanger 3 is connected with the bottom of the evaporation tank 1 and extends into the evaporation tank 1 through the guide cylinder 9 connected to the top of the tubular heat exchanger 3, and the vapor-liquid separator 11 is connected to the top of the evaporation tank 1.
In order to achieve the above object, the present invention further provides an evaporation concentration method based on the above mechanically assisted self-cleaning evaporation concentrator, including:
the material solution to be concentrated firstly enters a feed liquid circulation pipeline 5 from the outside, enters a mixing pipe 12 through a circulating pump 2 along with a pipeline, the bottom of a tubular heat exchanger 3 is connected with the mixing pipe 12, particles and the solution are mixed in the mixing pipe 12, a solid particle mixed fluidization buffer space is formed in the mixing pipe 12 under the drive of a fluid, so that the circulating particles and the fluid can be fully mixed and fluidized, the uniform distribution of the solid particles in a heat exchange pipe bundle is realized, the anti-scaling and heat transfer enhancement effects of the heat exchanger are ensured, the solution mixed with the solid particles enters a tube pass of the tubular heat exchanger 3 together, heating steam is introduced into a shell pass of the tubular heat exchanger 3, a fluidized state of mixing of the particles, the liquid two-phase or three-phase fluid of the particles, the liquid and the steam is formed in the tube pass, and the effects of boiling, impact and disturbance are formed in the tube pass, the heat boundary layer on the wall surface of the heating pipe and the scaling critical generation state are damaged, the adhesion of scaling substances is prevented, and the cleanness of the wall of the heating pipe is kept, so that the aims of enhancing heat transfer and preventing scaling are fulfilled.
The material fluid containing particles flows upwards in the heating pipe of the tubular heat exchanger 3, enters the bottom of an evaporation tank 1 connected with the tubular heat exchanger 3 and the particle circulating pipe 4 through an outlet at the upper end of the heating pipe and under the action of a guide cylinder 9, the particles are separated from solid and liquid under the action of fluid force and gravity settling, a particle storage area 7 and a liquid-solid separation area 8 are respectively arranged at the bottom and the upper part of the evaporation tank (1), the particles in the particle storage area 7 flow downwards under the action of gravity through the particle circulating pipe (4) and return to a mixing pipe 12 at the bottom of the tubular heat exchanger 3 again to be mixed with the materials, the fluid mixed with the particles and the material liquid enters the heating pipe of the tubular heat exchanger 3 upwards under the auxiliary driving of the circulating pump 2, and the circulation flow mode that the particles move upwards in the heat exchanging pipe of the tubular heat exchanger 3 and descend in the.
After a heated material solution enters the evaporation tank 1 through the guide flow cylinder 9, vapor-liquid separation is realized on the liquid surface of the evaporation tank 1, vapor is discharged from a vapor-liquid separator 11 above the liquid surface after being subjected to vapor-liquid separation and is discharged from a vapor outlet, the guide flow cylinder 9 plays a role of upward drainage, particles in the solution at the outlet of the guide flow cylinder 9 realize solid-liquid separation under the action of self gravity and solution fluid force, the separated solution is baffled and enters the backflow cylinder 10 and then enters the circulating pump 2 downwards through the material liquid circulating pipeline 5, and a closed material liquid circulating pipeline consisting of the circulating pump 2, the shell and tube heat exchanger 3, the evaporation tank 1 and the material liquid circulating pipeline 5 is formed.
The invention has the beneficial effects that:
the particles are added into the evaporation concentration device, the particles and the material solution flow and mix in the evaporation heat exchanger to form a solid phase, a vapor phase and a liquid phase multiphase fluidized state, the material solution containing the inert solid particles forms a comprehensive effect of boiling, impact, disturbance and friction contact with the wall surface in a heating pipe of the heat exchanger, the critical state of the fouling on the wall surface of the heating pipe is damaged, the adhesion of fouling substances is prevented, the cleanness of the wall surface of the heating pipe is kept, and the purposes of preventing the fouling and strengthening the heat transfer are achieved.
The guide flow cylinder is arranged in the evaporating pot, and the evaporating pot is directly connected with the upper tube plate of the tube still heat exchanger, so that the evaporating pot has multiple functions of solvent evaporation, vapor-liquid separation, solid particle storage and the like, and the equipment structure is simplified. The heat exchanger is provided with an external particle circulating pipe to connect the solid particle storage area with the particle circulating pipe of the heat exchanger, and solid particles and liquid flow back to the mixing pipe together through the vertical pipe by means of gravity, so that natural circulation of the solid particles is realized. The bottom end of the heat exchanger is provided with a solid particle mixing fluidization buffer space, so that circulating particles and fluid can be fully mixed and fluidized, and the solid particles are uniformly distributed in the heat exchange tube bundle, thereby ensuring the anti-scaling and heat transfer enhancement effects of the heat exchanger. A liquid circulating pipe is arranged between the evaporating tank and the bottom end of the heat exchanger, and a proper circulating pump is installed, so that sufficient flow velocity in the heat exchanger pipe is ensured under the auxiliary action of the circulating pump, and the normal circulation of solid particles is ensured.
Drawings
Fig. 1 is a schematic diagram of a structure and a process of a mechanically-assisted self-cleaning evaporation concentrator according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic diagram of a structure and a process of a mechanically-assisted self-cleaning evaporation concentrator according to an embodiment of the present invention, and as shown in fig. 1, the apparatus includes an evaporation tank 1, a circulation pump 2, a tube heat exchanger 3, a particle circulation tube 4, a feed liquid circulation tube 5, a particle regulating valve 6, a guide shell 9, a reflux shell 10, a vapor-liquid separator 11, and a mixing tube 12;
the circulating pump 2 is arranged in the feed liquid circulating pipe 5, one end of the feed liquid circulating pipe 5 is connected with a mixing pipe 12 connected with the bottom of the tube heat exchanger 3, the other end is connected with the bottom side wall of the evaporating pot 1 and extends to the inside of the evaporating pot 1, the reflux drum 10 is connected with a pipeline extending from the feed liquid circulating pipe 5 to the inside of the evaporation tank 1 and is opened upwards, the bottom of the particle circulating pipe 4 is connected with the side wall of the bottom mixing pipe 12 of the tube heat exchanger 3, the top of the particle circulating pipe 4 is connected with the bottom of the evaporation tank 1, a particle regulating valve 6 is arranged in the particle circulating pipe 4, the top of the tubular heat exchanger 3 is connected with the bottom of the evaporation tank 1 and extends into the evaporation tank 1 through the guide cylinder 9 connected to the top of the tubular heat exchanger 3, and the vapor-liquid separator 11 is connected to the top of the evaporation tank 1.
Specifically, each component is described below:
1. an evaporation tank 1:
the material of the evaporation tank can be carbon steel, 304 type stainless steel, 316L stainless steel or titanium material, the tank body is of a cylindrical structure, the bottom of the tank body is connected with the guide cylinder 9 and the top of the particle circulating pipe 4, an opening at the middle lower part of the tank body is connected with the feed liquid circulating pipe 5, and feed liquid enters the feed liquid circulating pipe 5 from the reflux cylinder 10. The steam on the liquid surface of the evaporating pot 1 enters the steam-liquid separator 11, and the steam is separated by the steam-liquid separator 11 and then goes out.
The evaporation tank 1 is suitable for evaporation at different temperatures and can operate in a negative pressure, normal pressure or positive pressure evaporation state, and the evaporation temperature of the evaporation tank 1 is not lower than 45 ℃ according to the standard design of a pressure container.
2. The vapor-liquid separator 11:
the device adopts a cylinder structure with a certain vapor-liquid separation space, liquid drops with larger diameters are separated by gravity settling, and liquid drops with smaller diameters are separated and removed by a demister arranged at the top of a vapor-liquid separator. The demister can be a simple type, an air flow impact type, a centrifugal type or a wire mesh demister and the like. Taking a wire mesh demister as an example, the method can remove droplet mist with the diameter being more than or equal to 3-5 um in steam, the liquid trapping efficiency reaches 98-99.8%, and the pressure drop loss of the steam passing through the demister is between 250-500 Pa.
3. Tubular heat exchanger 3:
the tube-array heat exchanger has mature technology and wide industrial application, and mainly comprises a shell, a tube plate, a heat exchange tube, an end enclosure, a baffling baffle and the like. The required materials can be respectively made of common carbon steel, red copper, or stainless steel and titanium. When heat exchange is carried out, materials enter from the connecting pipe of the end socket and flow in the pipe, and flow out from the outlet pipe at the other end of the end socket, which is called a pipe pass; the other fluid enters from a connecting pipe of the shell and flows out from the other connecting pipe on the shell, and the other fluid is called shell side.
The upper tube plate of the tube still heat exchanger 3 is directly connected with the guide shell 9 and the evaporating pot 1. During operation, particles enter from the lower end of the tube side, a multiphase flow operation state is formed in the tube side, the heat exchange efficiency of the tubular heat exchanger is improved by more than 10%, the wall of the heat exchange tube is clean, scaling is avoided, blockage is avoided, and the flow velocity of material solution in the tube reaches more than 1.5 m/s.
4. Particle circulation pipe 4:
the particle circulating pipe 4 can be a single or a plurality of vertical round pipes or special pipes, the pipe orifice at the top end is connected with the particle storage area 7, the pipe orifice at the lower end is connected with a mixing pipe 12 connected with the bottom of the shell and tube heat exchanger 3, and the bottom end of the particle circulating pipe 4 is provided with a particle regulating valve for controlling and regulating the circulating flow of solid particles. The pipe diameter of the particle circulating pipe 4 is more than 2 times of the single pipe diameter of the shell and tube heat exchanger, and the particle circulating pipe is used as a passage for particle descending and refluxing and a part of liquid circulating passage and is made of corrosion-resistant stainless steel, 2205 dual-phase steel, titanium materials and the like.
5. Feed liquid circulating pipe 5:
the feed liquid circulating pipe 5 is connected with the circulating pump 2, the tube still heat exchanger 3, the evaporating pot 1, the reflux cylinder 10 and the mixing pipe 12 to form a closed fluid circulating pipeline, mother liquid circulates in the pipeline, and the mother liquid circulating pipe 5 can be made of carbon steel, stainless steel, titanium materials and other metal materials.
6. And (3) a circulating pump 2:
an axial flow pump or a mixed flow pump or a centrifugal pump is adopted, and the circulating pump 2 is a commonly used device. The flow passage piece can be made of stainless steel 304, stainless steel 316L, titanium materials and the like according to materials. The circulating pump 2 is used for driving the feed liquid to accelerate the circulation flow in a closed circuit formed by the feed liquid circulating pipe 5, the tubular heat exchanger 3, the evaporating pot 1, the guide cylinder 9 and the mixing pipe 12. The thrust of the circulating pump is auxiliary supplement to the lifting force of the natural thermal evaporation circulation, and the normal circulation of the solid particles is ensured.
7. Granule dispensing valve 6
The flow passage piece can be made of stainless steel 304, stainless steel 316L, titanium materials and the like according to materials, and plays a role in adjusting the circulating flow of descending particles.
8. A guide shell 9:
the guide cylinder 9 is a cylindrical cylinder body, is fixed on an upper tube plate of the tube-type heat exchanger 3 and is in seamless connection with a high-temperature material solution outlet at the upper end of the tube-type heat exchanger 3, the guide cylinder 9 and the peripheral tube wall of the evaporation tank 1 form a particle storage area 7, a particle separator area 8 is formed with the space at the lower part of the reflux cylinder 10 and the peripheral wall surface of the evaporation tank 1, and the guide cylinder 9 simultaneously strengthens the upward drainage effect.
9. Reflow cylinder 10
The top of the reflux cylinder is conical and funnel-shaped, the bottom of the reflux cylinder is connected with the feed liquid circulating pipe 5, the feed liquid is guided to enter the feed liquid circulating pipe 5, and the conical cylinder body of the reflux cylinder plays a role in deflecting the feed liquid at the outlet part of the guide cylinder 9 downwards.
10. Mixing tube 12
A solid particle mixing fluidization buffer space is formed in the mixing pipe 12, so that the circulating particles and the fluid can be fully mixed and fluidized, the solid particles are uniformly distributed in the heat exchange pipe bundle, and the anti-scaling and heat transfer enhancement effects of the heat exchanger are ensured
The process principle is as follows:
concentrated material solution firstly enters a feed liquid circulation pipeline 5 from the outside, enters a mixing pipe 12 through a circulating pump 2 along with a pipeline and is connected with the bottom of a tubular heat exchanger 3, the bottom of the tubular heat exchanger 3 is respectively connected with the mixing pipe 12, particles and the solution are mixed in the mixing pipe 12, a solid particle mixed fluidization buffer space is formed in the mixing pipe 12 under the drive of fluid, so that the circulating particles and the fluid can be fully mixed and fluidized, the uniform distribution of the solid particles in a heat exchange pipe bundle is realized, the anti-scaling and heat transfer enhancement effects of the heat exchanger are ensured, the solution mixed with the solid particles enters a tube pass of the tubular heat exchanger 3 together, heating steam is introduced into a shell pass of the tubular heat exchanger 3, a fluidized state of mixing of the particles, the liquid two-phase or three-phase fluid of the particles, the liquid and the gas is formed in the tube pass, and the effects of boiling, impact, the heat boundary layer on the wall surface of the heating pipe and the scaling critical generation state are damaged, the adhesion of scaling substances is prevented, and the cleanness of the wall of the heating pipe is kept, so that the aims of enhancing heat transfer and preventing scaling are fulfilled.
The material fluid containing particles flows upwards in the heating pipe of the tubular heat exchanger 3, enters the bottom of an evaporation tank 1 connected with the tubular heat exchanger 3 and the particle circulating pipe 4 through an outlet at the upper end of the heating pipe and under the action of a guide cylinder 9, the particles are separated from solid and liquid under the action of fluid force and gravity settling, the bottom and the upper part of the evaporation tank (1) are a particle storage area 7 and a liquid-solid separation area 8 respectively, the particles in the particle storage area 7 flow downwards under the action of gravity through the particle circulating pipe 4 and return to a mixing pipe 12 at the bottom of the tubular heat exchanger 3 again to be mixed with the material, the fluid mixed with the particles and the material liquid enters the heating pipe of the tubular heat exchanger 3 upwards under the auxiliary driving of a circulating pump 2, and the circulation flow mode that the particles move upwards in the heat exchanging pipe of the tubular heat exchanger 3 and descend in the particle.
After a heated material solution enters the evaporation tank 1 through the guide flow cylinder 9, vapor-liquid separation is realized on the liquid surface of the evaporation tank 1, vapor is discharged from a vapor-liquid separator 11 above the liquid surface after being subjected to vapor-liquid separation and is discharged from a vapor outlet, the guide flow cylinder 9 plays a role of upward drainage, particles in the solution at the outlet of the guide flow cylinder 9 realize solid-liquid separation under the action of self gravity and solution fluid force, the separated solution is baffled and enters the backflow cylinder 10 and then enters the circulating pump 2 downwards through the material liquid circulating pipeline 5, and a closed material liquid circulating pipeline consisting of the circulating pump 2, the shell and tube heat exchanger 3, the evaporation tank 1 and the material liquid circulating pipeline 5 is formed.
The main innovation point of this patent:
1. the guide cylinder is arranged in the evaporating pot, and the evaporating pot is directly connected with the upper tube plate of the heat exchanger, so that the evaporating pot has multiple functions of solvent evaporation, vapor-liquid separation, solid particle storage and the like, and the equipment is compact and simple in structure.
2. The heat exchanger is provided with an external circulating pipe to connect the solid particle storage area with the heater particle circulating pipe, and solid particles and feed liquid flow back to the mixing pipe through the vertical pipe by means of gravity, so that natural circulation of the solid particles and the liquid materials is realized.
3. The bottom end of the heat exchanger is provided with a solid particle mixing fluidization buffer space, so that circulating particles and fluid can be fully mixed and fluidized, and the solid particles are uniformly distributed in the heat exchange tube bundle, thereby ensuring the anti-scaling and heat transfer enhancement effects of the heat exchanger.
4. A feed liquid circulating pipe is arranged between the evaporating pot and the bottom end of the tube still heat exchanger, and a proper circulating pump is installed to ensure that solid particles can normally circulate under the auxiliary action of the circulating pump.
The equipment is characterized in that: the structure is compact and simple; the scale prevention effect is good, and the heat transfer efficiency is high; compared with natural circulation, the particle circulation performance is good, and compared with forced circulation, the energy consumption of the circulating pump is lower.
The implementation case is as follows:
the technology is adopted on a certain mineral processing alkali liquor concentration recovery device, and the heat exchanger is opened before and after application to observe the scaling condition. Before the technology is adopted, when the evaporation concentration device continuously operates for 40 days, the evaporation capacity is obviously reduced, the evaporation concentration device cannot normally operate, and the heat exchanger needs to be stopped and opened for mechanical cleaning. The heat exchanger is opened for observation, and the heat exchanger heating pipe wall surface is seriously scaled, the thickness of the scale layer is measured to reach 3-5 mm, the pipe blocking phenomenon is partially generated, and the reduction of the evaporation capacity is the result of the remarkable reduction of the heat transfer efficiency caused by the generation of scale. By adopting the novel evaporation concentrator, the evaporation capacity is not obviously reduced when the device continuously operates for 120 days, and the heat exchanger is opened for observation, so that the heat exchange wall surface is basically free of scale formation. Through measuring and calculating the evaporation capacity, compared with the device before the new technology is adopted, the evaporation concentration processing capacity is improved by more than 30%, the energy is saved by more than 15%, and the economic and social benefits are remarkable.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a machinery assists automatically cleaning evaporation concentrator which characterized in that, includes evaporating pot (1), circulating pump (2), shell and tube heat exchanger (3), granule circulating pipe (4), feed liquid circulating pipe (5), granule adjusting valve (6), draft tube (9), backward flow section of thick bamboo (10), vapour and liquid separator (11) and hybrid tube (12).
Circulating pump (2) sets up in feed liquid circulating pipe (5), the one end of feed liquid circulating pipe (5) with hybrid tube (12) that the bottom of shell and tube heat exchanger (3) is connected, and the other end is connected the bottom lateral wall of evaporating pot (1) extends to inside of evaporating pot (1), backward flow section of thick bamboo (10) with feed liquid circulating pipe (5) extend to the inside pipe connection of evaporating pot (1) and the opening upwards, the bottom of granule circulating pipe (4) with the bottom hybrid tube (12) lateral wall of shell and tube heat exchanger (3) is connected, the top of granule circulating pipe (4) with the bottom of evaporating pot (1) is connected, set up granule adjusting valve (6) in granule circulating pipe (4), the top of shell and tube heat exchanger (3) with the bottom of evaporating pot (1) is connected and through connecting the draft tube (9) at shell and tube heat exchanger (3) top extend to the evaporation Inside the tank (1), the vapor-liquid separator (11) is connected to the top of the evaporation tank (1).
2. A mechanically assisted self-cleaning evaporative concentrator as claimed in claim 1 wherein the top of the evaporative tank (1) is connected to a vapour liquid separator (11).
3. A mechanically assisted self-cleaning evaporative concentrator as claimed in claim 1, wherein the particle circulation tube (4) is a single or multiple vertical round or shaped tubes.
4. A mechanically assisted self-cleaning evaporative concentrator as claimed in claim 1, wherein the circulation pump (2) is an axial or mixed or centrifugal pump.
5. A mechanically assisted self-cleaning evaporative concentrator as claimed in claim 1 wherein the particulate regulating valve (6) is a fluid switch or a flow regulating valve.
6. An evaporation concentration method based on a mechanical auxiliary self-cleaning evaporation concentrator as claimed in any one of claims 1 to 5, comprising: a material solution to be concentrated firstly enters a feed liquid circulation pipeline (5) from the outside, enters a mixing pipe (12) connected with the bottom of a tubular heat exchanger (3) along with the pipeline through a circulating pump (2), particles and the solution are mixed in the mixing pipe (12), a solid particle mixed fluidization buffer space is formed in the mixing pipe (12) under the drive of fluid, so that the circulating particles and the fluid can be fully mixed and fluidized, the distribution of the solid particles in a heat exchange pipe bundle is more uniform, the anti-scaling and heat transfer enhancement effects of the heat exchanger are ensured, the solution mixed with the solid particles enters the tube pass of the tubular heat exchanger (3) together, heating steam is introduced into the shell pass of the tubular heat exchanger (3), a fluidized state of mixing of the particles, the liquid two-phase or three-phase fluid of the particles, the liquid and the steam is formed in the tube pass, the effects of boiling, impact and disturbance are formed in the tube pass, and the thermal boundary layer and the critical generation state of, the adhesion of scaling substances is prevented, and the cleanness of the heating pipe wall is kept, so that the aims of enhancing heat transfer and preventing scaling are fulfilled;
material fluid containing particles flows upwards in a heating pipe of the tubular heat exchanger (3), enters the bottom of an evaporation tank (1) connected with the tubular heat exchanger (3) and the particle circulating pipe (4) through an outlet at the upper end of the heating pipe and under the action of a guide cylinder (9), the particles are separated from solid and liquid under the action of fluid force and gravity sedimentation, a particle storage area (7) and a liquid-solid separation area (8) are respectively arranged at the bottom and the upper part of the evaporation tank (1), the particles in the particle storage area (7) flow downwards under the action of gravity through the particle circulating pipe (4) and return to a mixing pipe (12) at the bottom of the tubular heat exchanger (3) again to be mixed with feed liquid, the fluid mixed with the feed liquid flows upwards into the heating pipe of the tubular heat exchanger (3) under the auxiliary driving of a circulating pump (2), and the particles move back and forth in the same way, so that the particles move upwards in the heat exchange, a circulating flow pattern descending in the particle circulating pipe (4).
After a heated material solution enters an evaporation tank (1) through a guide cylinder (9), vapor-liquid separation is realized on the liquid surface of the evaporation tank (1), vapor is discharged from a vapor outlet after passing through a vapor-liquid separator (11) above the liquid surface, the guide cylinder (9) plays a role of upward drainage, particles in the outlet solution of the guide cylinder (9) realize solid-liquid separation under the action of self gravity and solution fluid force, the separated solution is baffled to enter a reflux cylinder (10), and then enters a circulating pump (2) through a feed liquid circulating pipeline (5) in a downward mode, so that a closed feed liquid circulating pipeline consisting of the circulating pump (2), a shell and tube heat exchanger (3), the evaporation tank (1) and the feed liquid circulating pipeline (5) is formed.
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