CN111803981B - Deep concentration evaporator and method for high-salt high-viscosity easy-scaling feed liquid - Google Patents
Deep concentration evaporator and method for high-salt high-viscosity easy-scaling feed liquid Download PDFInfo
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- CN111803981B CN111803981B CN202010854682.8A CN202010854682A CN111803981B CN 111803981 B CN111803981 B CN 111803981B CN 202010854682 A CN202010854682 A CN 202010854682A CN 111803981 B CN111803981 B CN 111803981B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/222—In rotating vessels; vessels with movable parts
- B01D1/223—In rotating vessels; vessels with movable parts containing a rotor
- B01D1/225—In rotating vessels; vessels with movable parts containing a rotor with blades or scrapers
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Abstract
The invention discloses a high-salt high-viscosity liquid deep concentration evaporator easy to scale and a method. The heating plate is hollow disc structure, and the heating plate lower part is equipped with the breach of falling the U-shaped, and the heating plate embedding is installed on the inside support of casing, and rotatory scraper is installed on the center pin and rotates along with the center pin, and each rotatory scraper is installed in proper order between each heating plate. The invention adopts a mechanical film scraping mode to operate, the rotary scraper can clean the dirt, crystal or solid attachment on the surface of the heating plate in time, and the evaporator has no scaling and pipe plugging problems. The invention can realize high-concentration-multiple-rate evaporation of feed liquid, has the characteristics of large evaporation heat transfer area, high production capacity, few matched process equipment and the like, and is particularly suitable for deep evaporation concentration of various feed liquids with high viscosity, salt content, easy scaling and complex components.
Description
Technical Field
The invention relates to an evaporator, in particular to a deep concentration evaporator suitable for high-salt, high-viscosity and easily-scaling feed liquid, and belongs to the technical field of evaporation.
Background
In the evaporation field, a large amount of feed liquid with high viscosity, high salt and easy scaling exists, such as landfill leachate, MVR mother liquor, multi-effect evaporation residual liquid and the like. The feed liquid has complex components and high mineralization degree, and a large amount of calcium and magnesium ions exist. The conventional technology is usually used for evaporating and concentrating the feed liquid by adopting a traditional scraper evaporator, a forced circulation evaporator or directly burning. The traditional scraper evaporator has the heat exchange surface which is only the inner wall surface of the equipment, so that the heat exchange area of the traditional scraper evaporator is small, the evaporation production capacity is low, and the area of the traditional scraper evaporator applied in the current market is only 100m at most2. When the forced circulation evaporator is adopted to treat the feed liquid, the forced circulation evaporator is generally required to be matchedThe corresponding pretreatment process is sleeved to reduce the content of calcium and magnesium in the feed liquid, so that the evaporation system has longer process flow and higher operation cost, and a large amount of scale layers still can be deposited on the surface of the heat exchange tube after the forced circulation evaporator operates for a long time, so that the heat transfer resistance is increased, and even the heat exchange tube is blocked, so that the normal operation of the system is influenced. The incineration treatment method has a large environmental burden and energy consumption, and the incineration furnace has a serious high-temperature corrosion problem when the feed liquid is treated.
Disclosure of Invention
The invention aims to provide a high-salt high-viscosity deep concentration evaporator and a method for easily-scaling feed liquid, aiming at the defects of the prior art.
A deep concentration evaporator and method for high-salt high-viscosity easy-scaling feed liquid are characterized in that: the evaporator comprises a shell, a heating plate, a central shaft, a rotary scraper, a driving motor, a bracket, an end enclosure and a support;
the shell is of a horizontal cylindrical structure, a secondary steam outlet, a feed inlet and a raw steam inlet are formed in the top of the shell, a discharge outlet and a condensate outlet are formed in the bottom of the shell, and a support is arranged at the lower part of the shell;
the end sockets are arranged on two sides of the shell of the evaporator, shaft holes are formed in the end sockets and used for mounting a central shaft, and sealing and bearing assemblies of the central shaft are mounted at the shaft holes; the driving motor is connected with the central shaft;
the bracket is a frame and is used for supporting and fixing the heating plate, and the bracket is fixed in the evaporator shell;
the heating plates are of hollow disc-shaped structures, steam interfaces are arranged at the tops of the heating plates, condensate interfaces are arranged at the bottoms of the heating plates, the heating plates are arranged on the support at equal intervals and form a heating plate group, the steam interfaces at the tops of the heating plates are mutually communicated, and the condensate interfaces at the bottoms of the heating plates are mutually communicated;
the rotary scrapers are arranged on the central shaft and rotate along with the central shaft to scrape dirt on the heating plates, and the rotary scrapers are arranged among the heating plates at intervals.
Preferably, the support comprises square steel, and the support width equals with the heating plate width, and length equals with evaporimeter barrel length, and a plurality of equidistance breachs have been seted up to the crossbeam of support, and the breach width equals with heating plate thickness, and the breach interval is apart from more than or equal to rotatory scraper width.
Preferably, the rotary scraper is of a blade type structure, the number of blades of the rotary scraper is not less than two, the blades of the rotary scraper are arranged in the circumferential direction at equal intervals, and the length of the rotary scraper is equal to the radius of the disc surface of the heating disc.
Preferably, the lower part of the heating plate is provided with an inverted U-shaped notch so as to be convenient for installation, and a flow guide supporting rib plate is arranged inside the heating plate.
Preferably, the surface of the rotary scraper is attached with a polytetrafluoroethylene plate.
Preferably, the driving motor is a variable frequency motor.
The invention also provides a working method of the deep concentration evaporator for the high-salt high-viscosity easy-scaling feed liquid, which comprises the following steps: the material is fed into the evaporator through a feed inlet of the shell, and the liquid level is kept at 1/3-1/2 of the height of the heating plate; raw steam required by evaporation is started, the raw steam enters each heating plate in parallel through steam joints of the heating plates to provide required heat for material liquid evaporation, and condensate after heat release and condensation of the raw steam is collected through a condensate interface at the bottom of each heating plate and then is discharged out of the evaporator through a condensate outlet of the shell; and starting a driving motor, driving a rotary scraper on the central shaft to rotate circumferentially by the motor, continuously driving the feed liquid to the surface of the heating plate by the scraper blades, and timely cleaning away dirt, crystals or solid matters remained after the surface of the heating plate is evaporated so as to keep the heat exchange surface of the heating plate clean. The secondary steam generated by the evaporation of the feed liquid is discharged out of the evaporator through a secondary steam outlet of the shell, and the concentrated solution after the evaporation of the feed liquid is discharged out of the discharge hole.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional scraper evaporator, the scraper evaporator can remarkably expand the heat transfer area of the evaporator, the heat transfer area of the evaporator can reach 10-20 times of that of the traditional scraper evaporator under the condition of the same height and diameter size, and the evaporation capacity of the evaporator can be remarkably improved. Compared with the traditional forced circulation evaporator, the invention adopts a mechanical film scraping mode to operate, and the rotary scraper can timely scrape the filmDirt, crystals or solid attachments on the surface of the heating plate are cleaned, the evaporator has no scaling and pipe blockage problem, and the high-concentration-ratio evaporation of the feed liquid can be realized; the feed liquid is in a mixed flow state of storehouse tower flow and film flow on the surface of the heating plate, the evaporator has higher heat transfer coefficient, and the evaporation water amount per unit area can reach 20-150 kg/m2(ii) a In addition, the evaporator does not need to carry out pretreatment such as calcium and magnesium removal on the feed liquid, and can reduce the investment and the operating cost of the matched equipment of the evaporation system. The evaporator is particularly suitable for the evaporation and concentration of various high-viscosity, salt-containing and scaling-prone feed liquids.
Drawings
FIG. 1 is a schematic structural view of a high-salinity high-viscosity scaling-prone feed liquid deep concentration evaporator according to the present invention
FIG. 2 is a structural side view of a high-salinity high-viscosity scaling-prone material liquid deep concentration evaporator of the present invention
FIG. 3 is a profile view of the evaporator heating plate
FIG. 4 is a profile view of an evaporator blade type scraper blade
FIG. 5 is a view showing the profile of the heating plate supporter of the evaporator
In the figure, 1 is a shell, 2 is a heating plate, 3 is a central shaft, 4 is a rotary scraper, 5 is a driving motor, 6 is a support, 7 is a seal head, 8 is a support, 11 is a secondary steam outlet, 12 is a feed inlet, 13 is a steam inlet, 14 is a discharge outlet, 15 is a condensate outlet, 21 is a steam interface, 22 is a condensate interface, 23 is a flow guide supporting rib plate, and 31 is a sealing and bearing assembly.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples, which are given by way of illustration only and are not intended to limit the scope of the invention.
The first embodiment is as follows:
as shown in fig. 1 and 2, the deep concentration evaporator for the high-salt high-viscosity easy-scaling feed liquid comprises a shell 1, a heating plate 2, a central shaft 3, a rotary scraper 4, a driving motor 5, a support 6, a seal head 7 and a support 8. The shell 1 is of a horizontal cylindrical structure, the diameter of the cylinder is 1800mm, the length of the cylinder is 6000m, the top of the shell is provided with a secondary steam outlet 11, a feed inlet 12 and a raw materialA steam inlet 13, a discharge hole 14 and a condensate outlet 15 are arranged at the bottom of the shell, and a support 8 is arranged at the lower part of the shell; as shown in fig. 3, the heating plate is of a hollow disc-shaped structure, a flow guiding support rib plate 23 is arranged inside the heating plate, the total thickness of the heating plate is 20mm, the diameter of the circular surface of the heating plate is 1000mm, an inverted U-shaped notch is arranged at the lower part of the heating plate, the width of the notch is 200mm, a steam interface 21 is arranged at the top of the heating plate, and a condensate interface 22 is arranged at the bottom of the heating plate; a plurality of heating plates are sequentially arranged on the bracket 6 in an equidistant overlapping manner to form a heating plate group, steam interfaces at the top of each heating plate are mutually communicated, and condensate interfaces at the bottom are mutually communicated; a blind plate plug is arranged at the steam interface at the leftmost side of the heating disc group, and the steam interface at the right side is connected with a raw steam inlet of the evaporator shell; a condensate port on the rightmost side of the heating disc group is provided with a blind plate plug, and a condensate port on the left side of the heating disc group is connected with a condensate outlet of the evaporator shell; as shown in fig. 4, the rotary scraper 4 is of a four-blade paddle structure, the rotary scraper is mounted on the central shaft 3 and rotates along with the central shaft, the length of the rotary scraper is 495mm, the width of the scraper surface is 28mm, and the distance between adjacent rotary scrapers is 50 mm; the diameter of the central shaft 3 is 150 mm; as shown in fig. 5, the bracket 6 is welded by 100-type square steel, and heating plate embedding grooves are arranged along the length direction of the bracket, the width of each groove is 20mm, and the distance between the grooves is 30 mm; the heating plates are respectively embedded and installed on the bracket, 115 heating plates are totally arranged, and the total heat exchange area is about 200m2(ii) a Arranging the central shafts provided with the rotary scrapers (116 in total) to the central position of the heating plate through the lower gap of the heating plate; the end sockets 7 are arranged at two sides of the shell of the evaporator, shaft holes are formed in the end sockets, and a sealing and bearing assembly 31 of a central shaft is arranged at the shaft holes; the driving motor 5 adopts a variable frequency motor and is connected with the central shaft 3.
The working method of the embodiment is as follows:
the treated feed liquid is landfill leachate, the material is fed into the evaporator through the feed inlet of the shell, and the liquid level is kept at 1/2 at the height of the heating plate; and (3) starting raw steam, wherein the steam temperature is 150 ℃, the raw steam enters each heating plate in parallel through a steam joint of the heating plate to provide required heat for the evaporation of the feed liquid, and condensate after the heat release and condensation of the raw steam is collected by a condensate interface at the bottom of the heating plate and then is discharged out of the evaporator through a condensate outlet of the shell. And starting a driving motor, wherein the power of the motor is 50kW, the motor drives a rotary scraper on a central shaft to rotate circumferentially, scraper blades continuously bring the material liquid to the surface of the heating plate, and residual dirt, crystals or solid matters after the surface of the heating plate is evaporated are timely cleaned so as to keep the heat exchange surface of the heating plate clean. The secondary steam generated by the evaporation of the feed liquid is discharged out of the evaporator through a secondary steam outlet of the shell, and the concentrated solution after the evaporation of the feed liquid is discharged out of the discharge hole.
The heat exchange area of the present embodiment is 200m2The diameter of the device is 1800mm, the length is 6000mm, the evaporation temperature of the landfill leachate is 100 ℃, the temperature of the raw steam is 150 ℃, the heat transfer temperature difference of the evaporator is 50 ℃, and the evaporation water volume of the evaporator is 25-30 m3/h。
The mineralization degree of the garbage leakage liquid is high, a large amount of calcium and magnesium ion components are contained in the garbage leakage liquid, and the conventional evaporator has a serious pipe blockage problem due to scaling. The embodiment adopts the operation of mechanical knifing mode, and rotatory scraper can in time clear up the surperficial dirt of heating plate, crystal or solid form attachment, can realize the degree of depth evaporative concentration to landfill leachate. Has the advantages of large evaporation treatment capacity, continuous operation and the like.
Comparative example one:
this comparative example uses a conventional flash evaporator of the same physical dimensions as in example one to treat landfill leachate as in example one. The diameter of the scraper evaporator is 1800mm and the height is 6000 mm. The heat exchange area of the evaporator is 34m2. The temperature of the raw steam is 150 ℃, the evaporation temperature of the landfill leachate is 100 ℃, the heat transfer temperature difference is 50 ℃, and the evaporation water amount of the evaporator is 4-5 m3/h。
Under the condition of the same external dimension, the heat transfer area of the scraper blade evaporator of the comparative example is only 17 percent of that of the first example; under the condition of the same operation parameters, the evaporation capacity of the comparative example is only 15% -20% of that of the first example.
Although the present invention has been described in connection with the accompanying drawings, the present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, within the scope of the present invention.
Claims (5)
1. The utility model provides a high salt height is glutinous easy scale deposit feed liquid degree of depth concentrated evaporimeter which characterized in that: the evaporator comprises a shell, a heating plate, a central shaft, a rotary scraper, a driving motor, a bracket, an end enclosure and a support;
the shell is of a horizontal cylindrical structure, a secondary steam outlet, a feed inlet and a raw steam inlet are formed in the top of the shell, a discharge outlet and a condensate outlet are formed in the bottom of the shell, and a support is arranged at the lower part of the shell;
the end sockets are arranged on two sides of the shell of the evaporator, shaft holes are formed in the end sockets and used for mounting a central shaft, and sealing and bearing assemblies of the central shaft are mounted at the shaft holes; the driving motor is connected with the central shaft;
the bracket is a frame and is used for supporting and fixing the heating plate, and the bracket is fixed in the evaporator shell;
the heating plates are of hollow disc-shaped structures, steam interfaces are arranged at the tops of the heating plates, condensate interfaces are arranged at the bottoms of the heating plates, the heating plates are arranged on the support at equal intervals and form a heating plate group, the steam interfaces at the tops of the heating plates are mutually communicated, and the condensate interfaces at the bottoms of the heating plates are mutually communicated;
the rotary scrapers are arranged on the central shaft and rotate along with the central shaft to scrape dirt on the heating plates, the rotary scrapers are arranged between the heating plates at intervals, polytetrafluoroethylene plates are attached to the surfaces of the rotary scrapers, the rotary scrapers are of a paddle type structure, the number of blades of the rotary scrapers is not less than two, the blades of the rotary scrapers are circumferentially arranged at equal intervals, and the length of each rotary scraper is equal to the radius of the plate surface of each heating plate; when the evaporator works, the liquid level is kept at 1/3-1/2 of the height of the heating plate, the evaporator operates in a mechanical film scraping mode, and the liquid is kept on the surface of the heating plate to be in a storehouse tower flow and film flow mixed flow state.
2. The deep concentration evaporator for high-salt high-viscosity easy-scaling feed liquid according to claim 1, is characterized in that: the support comprises square steel, the width of the support is equal to the width of the heating plate, the length of the support is equal to the length of the evaporator barrel, a plurality of equidistant notches are formed in a cross beam of the support, the width of each notch is equal to the thickness of the heating plate, and the distance between the notches is larger than or equal to the width of the rotary scraper.
3. The deep concentration evaporator for high-salt high-viscosity easy-scaling feed liquid according to claim 1, is characterized in that: the lower part of the heating plate is provided with an inverted U-shaped notch, and a flow guide supporting rib plate is arranged inside the heating plate.
4. The deep concentration evaporator for high-salt high-viscosity easy-scaling feed liquid according to claim 1, is characterized in that: the driving motor is a variable frequency motor.
5. A working method of a deep concentration evaporator for high-salt high-viscosity easy-scaling feed liquid is characterized by comprising the following steps: by adopting the high-salt high-viscosity easy-scaling feed liquid deep concentration evaporator of claim 1, materials are fed into the evaporator through the feed inlet of the shell, and the liquid level is kept at 1/3-1/2 of the height of the heating plate; raw steam required by evaporation is started, the raw steam enters each heating plate in parallel through steam joints of the heating plates to provide required heat for material liquid evaporation, and condensate after heat release and condensation of the raw steam is collected through a condensate interface at the bottom of each heating plate and then is discharged out of the evaporator through a condensate outlet of the shell; and starting a driving motor, driving a rotary scraper on a central shaft to rotate circumferentially by the motor, continuously driving the feed liquid to the surface of the heating plate by the scraper blades, timely cleaning away dirt, crystals or solid matters remained on the surface of the heating plate after evaporation to keep the heat exchange surface of the heating plate clean, discharging secondary steam generated by evaporation of the feed liquid out of an evaporator through a secondary steam outlet of the shell, and discharging concentrated solution obtained after evaporation of the feed liquid out of a discharge hole.
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| CN111803981B true CN111803981B (en) | 2021-05-04 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208711080U (en) * | 2018-08-24 | 2019-04-09 | 博瑞德(张家港)环保科技有限公司 | A kind of evaporation concentration system of improvement |
| CN109987661A (en) * | 2019-03-22 | 2019-07-09 | 东南大学 | A kind of method and device of rotating film type evaporator processing high-salt wastewater |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4060118A (en) * | 1976-02-17 | 1977-11-29 | Alumax Mill Products, Inc. | Recovering chloride flux salts for aluminum |
| CN102764514B (en) * | 2012-08-10 | 2014-09-24 | 徐建涛 | Evaporation concentrator |
| CN111544921B (en) * | 2020-06-29 | 2020-10-16 | 天津乐科节能科技有限公司 | Self-backheating continuous melting crystallization system and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208711080U (en) * | 2018-08-24 | 2019-04-09 | 博瑞德(张家港)环保科技有限公司 | A kind of evaporation concentration system of improvement |
| CN109987661A (en) * | 2019-03-22 | 2019-07-09 | 东南大学 | A kind of method and device of rotating film type evaporator processing high-salt wastewater |
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