CN113101685B - Falling film evaporator - Google Patents
Falling film evaporator Download PDFInfo
- Publication number
- CN113101685B CN113101685B CN202110447764.5A CN202110447764A CN113101685B CN 113101685 B CN113101685 B CN 113101685B CN 202110447764 A CN202110447764 A CN 202110447764A CN 113101685 B CN113101685 B CN 113101685B
- Authority
- CN
- China
- Prior art keywords
- air
- heat exchange
- plate
- tube
- heating chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present application relates to a falling film evaporator comprising a heating chamber, an upper shell and a lower shell; a first tube plate is arranged at one end of the heating chamber facing the upper shell, and a first gas plate for introducing compressed gas is arranged at one side of the first tube plate facing the upper shell; a plurality of heat exchange tubes are uniformly distributed in the heating chamber; the first air plate is provided with a plurality of mounting holes corresponding to the plurality of heat exchange tubes; a mounting block for feed liquid to pass through is inserted in the mounting hole; a rotary sealing joint is fixed at the center of one side of the mounting block facing the heat exchange tube; one end of the rotary sealing joint, which is connected with the mounting block, is fixed with a communicating pipe communicated with the air cavity, and the other end of the rotary sealing joint is fixed with a rotating rod; a spiral feeding sheet is fixed on the periphery of the rotating rod; one end of the spiral feeding sheet close to the first tube plate is provided with an air nozzle, and the air nozzle faces to the tangential direction of the rotating rod; the rotating rod is provided with an air passage for communicating the rotary sealing joint with the air jet. This application has the effect that improves evaporation efficiency.
Description
Technical Field
The application relates to the field of evaporation equipment, in particular to a falling film evaporator.
Background
The falling film evaporator is characterized in that a feed liquid is fed into a heating chamber upper pipe box of the falling film evaporator, and the feed liquid flows from top to bottom in a film-forming shape along the inner wall of each heat exchange pipe under the action of gravity. In the flowing process, the shell-pass heating medium heats and vaporizes, the generated steam and the liquid phase enter a separation chamber of the evaporator together, and the steam and the liquid are fully separated. In the use process of the falling film evaporator, the feed liquid is uniformly distributed in each heat exchange tube, and the film is uniformly distributed along the inner wall of each heat exchange tube, which is an important factor for ensuring the normal operation of the falling film evaporator.
In the falling film evaporator in the related art, when feed liquid enters each heat exchange tube, the feed liquid flows along the inner wall of the heat exchange tube, and a plurality of small branches are formed on the inner wall of the heat exchange tube.
In view of the above related technologies, the inventor believes that the inner wall of the heat exchange tube forms a plurality of small branches due to the material liquid, when the material liquid is evaporated, the material liquid on the inner wall of the heat exchange tube is less, and after the material liquid is heated and vaporized by the heating medium, the concentration of the material liquid is easily and rapidly increased, and finally, the material liquid is crystallized, so that scale is formed, the heat conductivity of the heat exchange tube is affected, and the evaporation efficiency is further reduced.
Disclosure of Invention
In order to improve evaporation efficiency, the present application provides a falling film evaporator.
The application provides a falling film evaporator adopts following technical scheme:
a falling film evaporator comprises a heating chamber, an upper shell and a lower shell; the upper shell and the lower shell are respectively connected to two ends of the heating chamber in a sealing manner; a heating medium inlet is formed in the side part, close to the upper shell, of the heating chamber, and a heating medium outlet is formed in the side part, close to the lower shell, of the heating chamber; the upper shell is provided with a feed liquid inlet; a feed liquid outlet is formed in one end, far away from the heating chamber, of the lower shell, and a steam outlet is formed in the side part of the lower shell; a first tube plate is arranged at one end of the heating chamber facing the upper shell, a first air plate for introducing compressed air is arranged at one side of the first tube plate facing the upper shell, and the first air plate is provided with an air cavity; a second tube plate is arranged at one end of the heating chamber facing the lower shell; a plurality of heat exchange tubes are uniformly distributed in the heating chamber; one end of the heat exchange tube penetrates through the second tube plate and extends into the lower shell, and the other end of the heat exchange tube penetrates through the first tube plate; the first air plate is provided with a plurality of mounting holes corresponding to the plurality of heat exchange tubes; a mounting block for feed liquid to pass through is inserted in the mounting hole; a rotary sealing joint is fixed at the center of one side of the mounting block facing the heat exchange tube; a communicating pipe communicated with the air cavity is fixed at one end of the rotary sealing joint connected with the mounting block, and a rotating rod is fixed at the other end of the rotary sealing joint; the rotating rod extends along the length direction of the heat exchange tube; a spiral feeding sheet is fixed on the peripheral side of the rotating rod; the spiral feeding piece is abutted against the inner wall of the heat exchange tube; one end of the spiral feeding sheet, which is close to the first tube plate, is provided with an air nozzle, and the air nozzle faces the tangential direction of the rotating rod; and the rotating rod is provided with an air passage for communicating the rotary sealing joint with the air jet.
Through adopting above-mentioned technical scheme, in letting in the heating chamber through the heating medium import with heating medium earlier, will wait to evaporate the feed liquid afterwards and pour into the upper shell body through the feed liquid import in, in the feed liquid flowed into the heat exchange tube through the installation piece, the feed liquid along the helix of screw feed piece, rotatory and down for the feed liquid is in the in-process that removes in the heat exchange tube, abundant and the inner wall of heat exchange tube fully contacts, improves evaporation efficiency. After the feed liquid of feed liquid export flows cleanly, operating personnel can let in compressed gas to first gas board, and compressed gas enters into in the gas cavity and flows into the air flue through communicating pipe and rotary seal joint, sprays and goes out through the jet orifice, drives the dwang and rotates to drive the spiral feeding piece and rotate, spiral feeding piece pivoted in-process strikes off the feed liquid crystal that adheres to the heat exchange tube inner wall, thereby reduces the risk of heat exchange tube inner wall scale deposit, and then improves evaporation efficiency.
Optionally, a heating cavity communicated with the air jet is formed in the spiral feeding piece; the heating cavity extends along the spiral line of the spiral feeding piece.
Through adopting above-mentioned technical scheme, the in-process that the feed liquid flows in the heat exchange tube lets in the compressed gas of the regulation pressure value after the heating in to first air pocket, and the spiral feeding piece rotates for steam and liquid phase flow to the internal speed of inferior valve in the heat exchange tube, improve evaporation rate, because the compressed gas after the heating is let in the heating intracavity simultaneously, the feed liquid temperature that is located the spiral feeding piece surface will rise, thereby improve evaporation efficiency.
Optionally, at least two baffle plates for the heat exchange tubes to pass through are arranged in the heating chamber; at least two baffle plates are arranged in a staggered manner; and a gap for the heating medium to pass through is reserved between at least two baffle plates.
By adopting the technical scheme and the arrangement of the baffle plates, the stroke of the heating medium flowing into the heating cavity from the heating medium inlet to the heating medium outlet is increased, the contact time of the heating medium and the heat exchange tube is prolonged, the utilization rate of the heating medium is improved, and the use cost of the heating medium is reduced.
Optionally, a plurality of gas pipes are uniformly distributed in the heating chamber; each heat exchange tube corresponds to at least two gas transmission pipes; a second air plate for flowing out of compressed air is arranged at one end of the heating chamber facing the lower shell, a pressure relief cavity is formed in the second air plate, and an exhaust pipe penetrating through the side wall of the lower shell is arranged on the side wall of the second air plate; the pipe orifice of the exhaust pipe is blocked with an air plug; the exhaust pipe is communicated with the pressure relief cavity; one end of the gas pipe penetrates through the first tube plate and is communicated with the gas cavity; the other end of the gas pipe penetrates through the baffle plate and the second tube plate and is communicated with the pressure relief cavity; air bags are arranged on the first tube plate and one side of the baffle plate facing the second tube plate; the air bag is sleeved on the periphery of the gas conveying pipe; a contraction spring is fixed on the side wall of the air bag; one end of the air bag facing the second tube plate is fixed with a descaling block; the descaling block is sleeved on the periphery of the heat exchange tube; the descaling block is abutted against the side wall of the heat exchange tube; the side wall of the gas pipe is provided with a gas transmission port; and the side wall of the air bag is provided with an air filling port communicated with the air transmission port.
Through adopting above-mentioned technical scheme, let in compressed gas in to first gas board, part compressed gas will flow in the gas transmission pipe, and enter into the air pocket through gas transmission mouth and gas filling mouth, the air pocket is aerifyd, the extension of shrink spring, it removes along the length direction of heat exchange tube to drive the descaling block, strike off the dirt on heat exchange tube surface, the compressed gas of first gas board can intermittently let in, also can let in compressed gas to first gas board after the feed liquid stream of feed liquid export is clean again, when no compressed gas passes in first gas board, the shrink spring shrink, it resets to drive descaling block, thereby realize that the descaling block makes a round trip to erase the effect of the dirt on heat exchange tube surface.
Optionally, at least two screwed joints are coaxially sleeved on the outer peripheral side of the gas transmission pipe; one end of the air bag, which is far away from the descaling block, is fixedly connected with a rotating ring; the rotating ring is rotatably connected to the threaded joint; the threaded joint is threadedly connected to the first tube sheet and the side of the baffle plate facing the second tube sheet.
Through adopting above-mentioned technical scheme, on the one hand screwed joint's introduction is convenient for fix the air pocket in week side of gas-supply pipe in earlier stage, improves the efficiency that the air pocket was installed in gas-supply pipe week side, and on the other hand when the air pocket was aerifyd, improves the firm in connection nature of air pocket and first tube sheet, improves the firm in connection nature of air pocket and baffling board simultaneously.
Optionally, a first guide surface is obliquely arranged on one side of the baffle plate facing the first tube plate.
Through adopting above-mentioned technical scheme, reduce the risk that the dirt piece scraped heat exchange tube week side is piled up in the baffling board to reduce the heat exchange tube outer wall by the adnexed risk of dirt, and then improve heat exchange efficiency of heat exchange tube and heating medium.
Optionally, a second guide surface is obliquely arranged on one side of the second tube plate facing the first tube plate; a dirt outlet through which dirt passes is formed in the side wall of the heating chamber; the dirt outlet is positioned on one side of the lowest point of the horizontal position of the second guide surface; and a sealing cover which is opened and closed to the dirt outlet is arranged on the outer side wall of the heating chamber.
Through adopting above-mentioned technical scheme, when the dirt of piling up in the heating chamber is cleared up to needs, open the closing cap earlier, operating personnel can blow in compressed gas to the heating medium export afterwards, will pile up outside the dirt export is blown out to the dirt of second tube sheet, alright accomplish the clearance to the dirt of piling up in the heating chamber. Through the setting of second spigot surface, reduce the risk that accumulational dirt blockked up the heating medium export, open the opening at the closing cap simultaneously and be convenient for clean the dirt outside the dirt export.
Optionally, a filter screen is arranged in the lower shell; the filter screen is located between the feed liquid outlet and the steam outlet.
Through adopting above-mentioned technical scheme, reduce the spiral feed piece and strike off the risk that the dirt of heat transfer pipe inner wall blockked up the feed liquid export, improve the purity that the feed liquid export flowed through the feed liquid, reduce the risk that the feed liquid adulterated the dirt.
Optionally, the filter screen is conical; the tip of the filter screen faces the second tube plate.
Through adopting above-mentioned technical scheme, reduce the dirt and pile up the risk of blockking up the filter screen mesh in the filter screen, improve the smoothness nature of feed liquid through the filter screen.
Optionally, a groove is formed in one side, away from the first tube plate, of the first air plate; one side of the mounting block, which is far away from the heat exchange tube, is provided with a butting ring which is butted with one side of the first air plate, which is far away from the first tube plate; and a convex block embedded in the groove is fixed on the side wall of the butting ring.
Through adopting above-mentioned technical scheme, the recess is inlayed each other with the lug and is established, when being convenient for install earlier stage, confirms the intercommunication position of communicating pipe and first gas board, improves the connection efficiency of installation piece and first gas board. Simultaneously, the setting of butt ring improves the connection stability of installation piece and first gas board, reduces the risk that the installation piece is absorbed in the heating chamber.
In summary, the present application includes at least one of the following beneficial technical effects:
1. compressed gas is introduced into the first gas plate, enters the gas cavity, flows into the gas channel through the communicating pipe and the rotary sealing joint, is ejected through the gas jet, drives the rotating rod to rotate, so that the spiral feeding piece is driven to rotate, and in the rotating process of the spiral feeding piece, liquid crystals adhered to the inner wall of the heat exchange pipe are scraped, so that the risk of scaling of the inner wall of the heat exchange pipe is reduced, and the evaporation efficiency is improved;
2. after compressed gas is introduced into the first gas plate through the gas bag and the contraction spring, part of the compressed gas flows into the gas conveying pipe and enters the gas bag through the gas conveying port and the gas filling port, the gas bag is inflated, and the contraction spring extends to drive the scale removing block to move along the length direction of the heat exchange pipe and remove the scale on the surface of the heat exchange pipe, so that the risk of generating the scale on the outer side wall of the heat exchange pipe is reduced, and the evaporation efficiency is improved;
3. through conical filter screen, reduce the spiral feed piece and strike off the risk that the dirt of heat transfer pipe inner wall blockked up the feed liquid export, improve the purity that the feed liquid export flowed through the feed liquid, reduce the risk that the feed liquid mixes the dirt, reduce simultaneously that the dirt is piled up in the risk that the filter screen blockked up the filter screen mesh, improve the smoothness nature of feed liquid through the filter screen.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.
Fig. 2 is a schematic view showing the internal structure of the heating chamber and the lower housing according to the embodiment of the present application.
FIG. 3 is a schematic diagram illustrating the position of a mounting block and a first air plate according to an embodiment of the present invention.
Fig. 4 is an enlarged view of fig. 3 at a portion a.
Fig. 5 is a schematic structural view for showing a rotating lever and a screw feed piece of an embodiment of the present application.
Description of reference numerals: 1. a heating chamber; 11. a heating medium inlet; 12. a heating medium outlet; 13. a heat exchange pipe; 14. a gas delivery pipe; 141. a gas transmission port; 142. a high temperature resistant hose; 15. a baffle plate; 151. a first guide surface; 16. a dirt outlet; 17. sealing the cover; 2. an upper housing; 21. a feed liquid inlet; 3. a lower housing; 31. a feed liquid outlet; 32. a steam outlet; 33. a filter screen; 4. a first tube sheet; 5. a first gas panel; 51. an air cavity; 52. an air inlet pipe; 53. a groove; 6. a second tube sheet; 61. a second guide surface; 7. mounting holes; 8. mounting blocks; 81. a butting ring; 811. a bump; 82. a rotary seal joint; 83. a communicating pipe; 84. rotating the rod; 841. an airway; 85. a screw feeding piece; 851. an air jet; 852. a heating cavity; 9. a second gas panel; 91. a pressure relief cavity; 92. an exhaust pipe; 921. an air lock; 10. an air bag; 101. a retraction spring; 102. a threaded joint; 103. a rotating ring; 104. removing scale blocks; 105. and an air filling port.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The falling-film evaporator is characterized in that a feed liquid is fed into a heating chamber upper pipe box of the falling-film evaporator, the feed liquid flows from top to bottom in a film-forming shape along the inner wall of each heat exchange pipe under the action of gravity, a heating medium in the heating chamber is in contact with the heat exchange pipes, so that the feed liquid in the heat exchange pipes is evaporated, steam and the feed liquid in the heat exchange pipes coexist, the generated steam and a liquid phase jointly enter a separation chamber of the evaporator, and the steam and the liquid are fully separated.
The embodiment of the application discloses a falling film evaporator. Referring to fig. 1, a falling film evaporator includes a heating chamber 1, an upper shell 2, and a lower shell 3, wherein the heating chamber 1 is shaped as a cylindrical structure with both ends open. The upper casing 2 and the lower casing 3 are respectively flange-sealed at both ends of the heating chamber 1. The side of the heating chamber 1 close to the upper shell 2 is provided with a heating medium inlet 11, and the side of the heating chamber 1 close to the lower shell 3 is provided with a heating medium outlet 12. The upper shell 2 is provided with a feed liquid inlet 21, one end of the lower shell 3, which is far away from the heating chamber 1, is provided with a feed liquid outlet 31, and the lateral part of the lower shell 3 is provided with a steam outlet 32.
Referring to fig. 2, a first tube plate 4 is welded at one end of the heating chamber 1 facing the upper shell 2, a first air plate 5 for introducing compressed air is welded at one side of the first tube plate 4 facing the upper shell 2, the compressed air can be air or inert gas, an air cavity 51 is formed in the first air plate 5, an air inlet pipe 52 penetrating through the side wall of the upper shell 2 is fixed on the side wall of the first air plate 5, and the air inlet pipe 52 is communicated with the air cavity 51. A second tube sheet 6 is welded to the end of the heating chamber 1 facing the lower shell 3. A plurality of heat exchange tubes 13 are uniformly distributed in the heating chamber 1, one ends of the heat exchange tubes 13 penetrate through the second tube plate 6 and extend into the lower shell 3, and the other ends of the heat exchange tubes 13 penetrate through the first tube plate 4 and are flush with one side plate surface of the first tube plate 4 facing the first air plate 5.
Referring to fig. 3 and 4, a plurality of mounting holes 7 corresponding to the plurality of heat exchange tubes 13 are formed in the surface of the first gas plate 5, a mounting block 8 through which the feed liquid passes is inserted into the mounting hole 7, an abutting ring 81 is integrally formed at one end of the mounting block 8 away from the heat exchange tubes 13, and the abutting ring 81 abuts against the surface of the first gas plate 5. One side of first air plate 5 that deviates from first tube sheet 4 is seted up flutedly 53, and butt ring 81 has lug 811 towards one side integrated into one piece of first air plate 5, and lug 811 inlays and locates in flutedly 53.
Referring to fig. 4, a rotary sealing joint 82 is fixed at the center of the side of the mounting block 8 facing the heat exchange tube 13 in a sealing manner, a communicating tube 83 communicated with the air chamber 51 is fixed at one end of the rotary sealing joint 82 connected with the mounting block 8, and the groove 53 is positioned right above the position where the communicating tube 83 is communicated with the air chamber 51. The other end of the rotary sealing joint 82 is fixed with a rotary rod 84, and the rotary rod 84 extends along the length direction of the heat exchange tube 13. A spiral feed piece 85 is fixed to the peripheral side of the rotation lever 84, the spiral feed piece 85 abuts against the inner wall of the heat exchange tube 13, and the length of the rotation lever 84 is greater than or equal to the length of the heat exchange tube 13 so as to be in contact with most of the inner wall of the heat exchange tube 13 when the spiral feed piece 85 rotates. In the manufacturing process of the screw feeding piece 85, a carburizing treatment is performed, that is, a large amount of carbon is permeated into the surface of the steel to generate carbon compounds, so that not only can the hardness of the screw feeding piece 85 be increased, but also the friction coefficient between the screw feeding piece 85 and the heat exchange tube 13 can be reduced, and the screw feeding piece 85 can smoothly rotate.
Referring to fig. 4 and 5, the spiral feed piece 85 has an air injection port 851 formed at an end thereof adjacent to the first air plate 5, the air injection port 851 being oriented toward the inner wall of the heat exchange pipe 13, and in this embodiment, the air injection port 851 is oriented in parallel with the tangential direction of the rotating lever 84. The rotating rod 84 is provided with an air channel 841 communicated with the rotary seal joint 82, and the air channel 841 is arranged to extend along the length direction of the rotating rod 84. The spiral feeding piece 85 is internally provided with a heating cavity 852 extending along the spiral line of the spiral feeding piece 85, the heating cavity 852 is communicated with an air channel 841, an air jet hole 851 is communicated with the heating cavity 852, and the heating cavity 852 is arranged to lighten the weight of the spiral feeding piece 85 on one hand and preheat feed liquid flowing on the surface of the spiral feeding piece 85 on the other hand. In the process that the liquid flows in the heat exchange tube 13, the heated compressed gas with a specified pressure value can be introduced into the first air plate 5, the spiral feeding piece 85 rotates to scrape off liquid crystal attached to the inner wall of the heat exchange tube 13, the speed of flowing the steam and the liquid phase in the heat exchange tube 13 into the lower shell 3 is accelerated, and meanwhile, the temperature of the liquid on the surface of the spiral feeding piece 85 rises to the boiling point due to the introduction of the heated compressed gas in the heating cavity 852, so that the evaporation efficiency is improved.
Referring to fig. 3, in the present example, to reduce the risk of impurities in the heating medium adhering to the outer side wall of the heat exchange pipe 13, the heating medium may be hot steam. A plurality of air delivery pipes 14 are uniformly distributed in the heating chamber 1, the number of the air delivery pipes 14 is twice that of the heat exchange pipes 13, namely, each heat exchange pipe 13 corresponds to two air delivery pipes 14, and the two air delivery pipes 14 are symmetrically arranged by taking the axis of the heat exchange pipe 13 as a symmetry line. The pipe diameter of the gas pipe 14 is smaller than that of the heat exchange pipe 13.
Referring to fig. 2, a second air plate 9 is welded on one side of the second tube plate 6 facing the lower shell 3, a mounting hole 7 for the heat exchange tube 13 to pass through is also formed in the surface of the second air plate 9, and a pressure relief cavity 91 is formed in the second air plate 9. One end of the gas pipe 14 passes through the first tube plate 4 to communicate with the gas chamber 51, and the other end passes through the second tube plate 6 to communicate with the pressure relief chamber 91. The peripheral sides of the gas pipes 14 are welded with the first tube plate 4 and the second tube plate 6. The welding of second gas board 9 has the blast pipe 92 that passes second tube sheet 6, and the mouth of pipe of blast pipe 92 is blockked up has air plug 921, and air plug 921 threaded connection is in blast pipe 92, and blast pipe 92 communicates in pressure release chamber 91, sets up the aim at in pressure release chamber 91, makes compressed gas smoothly flow in the gas-supply pipe 14.
Referring to fig. 3 and 4, the air bag 10 is coaxially sleeved on the outer peripheral side of the air delivery pipe 14, and the projection of the air bag 10 along the axial direction of the air delivery pipe 14 is a circular ring. A contraction spring 101 for forcing the air bag 10 to contract is fixed on the inner wall of the air bag 10, and the contraction spring 101 contracts along the axial direction of the air delivery pipe 14. The outer peripheral side of the gas pipe 14 is coaxially sleeved with a threaded joint 102, and the threaded joint 102 is in threaded connection with one side of the first tube plate 4, which is far away from the first gas plate 5. One end of the air bag 10 is fixed with a rotating ring 103 which is rotatably connected with the threaded joint 102, the other end is fixed with a descaling block 104, wherein each heat exchange tube 13 is correspondingly provided with two air conveying tubes 14, and the peripheral sides of the air bag 10 on the peripheral sides of the two air conveying tubes 14 are fixed with the peripheral side of the descaling block 104. The descaling block 104 is sleeved and abutted to the outer periphery side of the heat exchange tube 13, and the descaling block 104 can be a high-temperature wear-resistant tortoise-shell net composite tube, a rubber block or an iron block.
Referring to fig. 2 and 4, an air transmission port 141 is formed in a side wall of the air transmission pipe 14, and a high temperature resistant hose 142 communicated with the air transmission port 141 is fixedly bonded to an outer side wall of the air transmission pipe 14. The side wall of the air bag 10 is provided with an air filling opening 105, and one end of the high temperature resistant hose 142 far away from the air delivery pipe 14 is welded on the side wall of the air bag 10 and communicated with the air filling opening 105. Before compressed gas is introduced into the first air plate 5, the air plug 921 is pulled out from the opening of the exhaust pipe 92, then compressed gas is introduced into the first air plate 5, part of the compressed gas flows into the gas pipe 14, and enters the gas bag 10 through the gas transmission opening 141, the high-temperature-resistant hose 142 and the gas filling opening 105, the gas bag 10 is inflated, the contraction spring 101 extends, the scale removal block 104 is driven to move along the length direction of the heat exchange pipe 13, dirt on the surface of the heat exchange pipe 13 is scraped, the compressed gas of the first air plate 5 can be introduced intermittently, and compressed gas can be introduced into the first air plate 5 when no material liquid flows in the heat exchange pipe 13. When no compressed gas is introduced into the first air plate 5, the contraction spring 101 contracts to drive the descaling block 104 to reset, so that the descaling block 104 can wipe dirt on the surface of the heat exchange tube 13 back and forth.
Referring to fig. 2, in this example, in order to increase the time during which the heating medium is held in the heating chamber 1, two baffle plates 15 are provided in the heating chamber 1, the two baffle plates 15 are located between the heating medium inlet 11 and the heating medium outlet 12, and the side walls of the baffle plates 15 abut against the inner wall of the heating chamber 1. The two baffle plates 15 are arranged in a staggered mode, and a gap for the heating medium to pass through is reserved between the two baffle plates 15, so that when the heating medium flows in from the heating medium inlet 11 and flows out from the heating medium outlet 12, the flow path of the heating medium in the heating chamber 1 is S-shaped.
Referring to fig. 2, it should be noted that the gas pipe 14 and the heat exchange pipe 13 both pass through the plate surface of the baffle 15. The side of the baffle plate 15 facing the second tube plate 6 is likewise screwed with a screw connection 102, an air bag 10 connected to the screw connection 102 and a detergent block 104 fixed to the air bag 10. A first guide surface 151 is provided obliquely to a surface of the baffle plate 15 facing the first tube plate 4, and the first guide surface 151 is abutted by the detergent block 104. The first guide surface 151 is provided to reduce the risk that the scale removing block 104 scrapes off the scale accumulated on the baffle 15 on the peripheral side of the heat exchange tube 13, thereby reducing the risk that the outer wall of the heat exchange tube 13 is adhered by the scale.
Referring to fig. 3, in the present embodiment, in order to reduce the risk of the scraped-off dirt blocking the feed liquid outlet 31 and the heating medium outlet 12, the side of the second tube sheet 6 facing the first tube sheet 4 is obliquely provided with a second guide surface 61 for allowing the dirt to slide down to the second tube sheet 6. The outer side wall of the heating chamber 1 is provided with a dirt outlet 16 for dirt to pass through, the dirt outlet 16 is positioned on one side of the lowest point of the horizontal position of the second guide surface 61, and the heating medium outlet 12 is positioned at the highest point of the horizontal position of the second guide surface 61. The outer side wall of the heating chamber 1 is provided with a sealing cover 17 covering the dirt outlet 16, and the connection mode of the sealing cover 17 and the outer side wall of the heating chamber 1 can be bolt connection or bolt connection. By means of the second guide surface 61 the risk of clogging of the heating medium outlet 12 by accumulated dirt is reduced, while at the same time cleaning of dirt out of the dirt outlet 16 is facilitated after opening of the cover 17.
Referring to fig. 2, a conical filter 33 is abutted in the lower case 3, and the tip of the filter 33 faces the second air plate 9. The filter screen 33 is located between feed liquid export 31 and steam outlet 32, sets up the filter screen 33 as conical aim at, and when the dirt dropped to the surface of filter screen 33, the cambered surface along filter screen 33 rolled down, reduced the risk that the dirt blockked up the filter screen 33 mesh, improved the life of filter screen 33, reduced the number of times of clean filter screen 33.
The implementation principle of the falling film evaporator in the embodiment of the application is as follows: firstly, heating medium is introduced into the heating chamber 1 through the heating medium inlet 11, then the material liquid to be evaporated is poured into the upper shell 2 through the material liquid inlet 21, the material liquid flows into the heat exchange tube 13 through the installation block 8, and the material liquid is rotated and lowered along the spiral line of the spiral feeding piece 85, so that the material liquid is fully contacted with the inner wall of the heat exchange tube 13 in the moving process of the heat exchange tube 13, and the evaporation efficiency is improved.
When the feed liquid flows in the heat exchange tube 13, operating personnel can let in after heating to the intake pipe 52, the compressed gas of the specified pressure value, compressed gas gets into in the air cavity 51 and flows into air flue 841 and heating chamber 852 through communicating pipe 83 and rotary seal joint 82, jet and go out through gas jet 851, drive dwang 84 and rotate, thereby drive spiral feed piece 85 and rotate, spiral feed piece 85 pivoted in-process, strike off the adhesion in the feed liquid crystal of heat exchange tube 13 inner wall, accelerate the feed liquid simultaneously and be located the speed that the steam passes through heat exchange tube 13 in the heat exchange tube 13, accelerate the evaporation efficiency of feed liquid.
When compressed air enters the air conveying pipe 14, the compressed air enters the air bag 10 through the air conveying port 141, the high-temperature-resistant hose 142 and the air filling port 105, the air bag 10 is inflated, the contraction spring 101 extends to drive the scale removing block 104 to move along the length direction of the heat exchange pipe 13, and scale on the surface of the heat exchange pipe 13 is scraped. When the air plug 921 is separated from the exhaust pipe 92, the contraction spring 101 contracts to drive the descaling block 104 to reset, so that the descaling block 104 can wipe dirt on the surface of the heat exchange pipe 13 back and forth, and the evaporation efficiency is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the scaling, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A falling film evaporator, characterized by: comprises a heating chamber (1), an upper shell (2) and a lower shell (3); the upper shell (2) and the lower shell (3) are respectively connected to two ends of the heating chamber (1) in a sealing manner; a heating medium inlet (11) is formed in the side part, close to the upper shell (2), of the heating chamber (1), and a heating medium outlet (12) is formed in the side part, close to the lower shell (3), of the heating chamber (1); the upper shell (2) is provided with a feed liquid inlet (21); a feed liquid outlet (31) is formed in one end, far away from the heating chamber (1), of the lower shell (3), and a steam outlet (32) is formed in the side part of the lower shell (3); a first tube plate (4) is arranged at one end, facing the upper shell (2), of the heating chamber (1), a first air plate (5) used for introducing compressed air is arranged at one side, facing the upper shell (2), of the first tube plate (4), and an air cavity (51) is formed in the first air plate (5); a second tube plate (6) is arranged at one end of the heating chamber (1) facing the lower shell (3); a plurality of heat exchange tubes (13) are uniformly distributed in the heating chamber (1); one end of the heat exchange tube (13) penetrates through the second tube plate (6) and extends into the lower shell (3), and the other end of the heat exchange tube penetrates through the first tube plate (4); the first air plate (5) is provided with a plurality of mounting holes (7) corresponding to the plurality of heat exchange tubes (13); a mounting block (8) for feed liquid to pass through is inserted in the mounting hole (7);
a rotary sealing joint (82) is fixed at the center of one side of the mounting block (8) facing the heat exchange tube (13); a communicating pipe (83) communicated with the air cavity (51) is fixed at one end of the rotary sealing joint (82) connected with the mounting block (8), and a rotating rod (84) is fixed at the other end of the rotary sealing joint (82); the rotating rod (84) extends along the length direction of the heat exchange tube (13); a spiral feeding piece (85) is fixed on the peripheral side of the rotating rod (84); the spiral feeding sheet (85) is abutted against the inner wall of the heat exchange tube (13); one end of the spiral feeding piece (85) close to the first tube plate (4) is provided with an air nozzle (851), and the air nozzle (851) faces the tangential direction of the rotating rod (84); the rotating rod (84) is provided with an air channel (841) which communicates the rotating seal joint (82) with the air nozzle (851);
at least two baffle plates (15) for the heat exchange tubes (13) to pass through are arranged in the heating chamber (1); at least two baffle plates (15) are arranged in a staggered manner; a gap for a heating medium to pass through is reserved between at least two baffle plates (15); a plurality of gas conveying pipes (14) are uniformly distributed in the heating chamber (1); each heat exchange pipe (13) corresponds to at least two gas conveying pipes (14); a second air plate (9) for flowing out of compressed air is arranged at one end, facing the lower shell (3), of the heating chamber (1), a pressure relief cavity (91) is formed in the second air plate (9), and an exhaust pipe (92) penetrating through the side wall of the lower shell (3) is arranged on the side wall of the second air plate (9); the nozzle of the exhaust pipe (92) is plugged with an air plug (921); the exhaust pipe (92) is communicated with the pressure relief cavity (91); one end of the gas pipe (14) passes through the first tube plate (4) and is communicated with the gas cavity (51); the other end of the gas pipe (14) penetrates through the baffle plate (15) and the second tube plate (6) and is communicated with the pressure relief cavity (91); air bags (10) are arranged on the sides, facing the second tube plate (6), of the first tube plate (4) and the baffle plate (15); the air bag (10) is sleeved on the periphery of the gas transmission pipe (14); a contraction spring (101) is fixed on the side wall of the air bag (10); a descaling block (104) is fixed at one end of the air bag (10) facing the second tube plate (6); the descaling block (104) is sleeved on the outer peripheral side of the heat exchange tube (13); the descaling block (104) is abutted against the side wall of the heat exchange pipe (13); an air transmission port (141) is formed in the side wall of the air transmission pipe (14); and the side wall of the air bag (10) is provided with an air filling port (105) communicated with the air conveying port (141).
2. A falling film evaporator according to claim 1 wherein: a heating cavity (852) communicated with the air jet opening (851) is formed in the spiral feeding piece (85); the heating cavity (852) is arranged along the spiral line of the spiral feeding piece (85).
3. A falling film evaporator according to claim 1 wherein: at least two screwed joints (102) are coaxially sleeved on the outer peripheral side of the air conveying pipe (14); one end of the air bag (10) far away from the descaling block (104) is fixedly connected with a rotating ring (103); the rotating ring (103) is rotatably connected to the threaded joint (102); the threaded joint (102) is screwed to the first tube plate (4) and to the side of the baffle plate (15) facing the second tube plate (6).
4. A falling film evaporator according to claim 1 wherein: one side of the baffle plate (15) facing the first tube plate (4) is obliquely provided with a first guide surface (151) for enabling dirt to slide down to the second tube plate (6).
5. A falling film evaporator according to claim 4 wherein: a second guide surface (61) is obliquely arranged on one side, facing the first tube plate (4), of the second tube plate (6); a dirt outlet (16) for dirt to pass through is formed in the side wall of the heating chamber (1); the dirt outlet (16) is positioned on one side of the lowest point of the horizontal position of the second guide surface (61); the outer side wall of the heating chamber (1) is provided with a sealing cover (17) which is opened and closed on the dirt outlet (16).
6. A falling film evaporator according to claim 1 wherein: a filter screen (33) is arranged in the lower shell (3); the filter screen (33) is positioned between the feed liquid outlet (31) and the steam outlet (32).
7. A falling film evaporator according to claim 6 wherein: the filter screen (33) is conical; the tip of the filter screen (33) faces the second tube sheet (6).
8. A falling film evaporator according to claim 1 wherein: one side of the first air plate (5) departing from the first tube plate (4) is provided with a groove (53); one side, far away from the heat exchange tube (13), of the mounting block (8) is provided with a butting ring (81) which is butted against one side, far away from the first tube plate (4), of the first air plate (5); and a convex block (811) embedded in the groove (53) is fixed on the side wall of the abutting ring (81).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110447764.5A CN113101685B (en) | 2021-04-25 | 2021-04-25 | Falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110447764.5A CN113101685B (en) | 2021-04-25 | 2021-04-25 | Falling film evaporator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113101685A CN113101685A (en) | 2021-07-13 |
| CN113101685B true CN113101685B (en) | 2022-08-12 |
Family
ID=76720091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110447764.5A Active CN113101685B (en) | 2021-04-25 | 2021-04-25 | Falling film evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113101685B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114669066B (en) * | 2022-03-24 | 2023-09-26 | 四川点石能源股份有限公司 | MVR evaporation concentration system |
| CN117180770A (en) * | 2022-12-05 | 2023-12-08 | 江苏格兰特干燥浓缩设备有限公司 | Application process of integrated falling film evaporator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539076A (en) * | 1982-09-27 | 1985-09-03 | Swain R L Bibb | Vapor compression distillation system |
| CN207562367U (en) * | 2017-09-30 | 2018-07-03 | 马明娥 | A kind of gummi arabicum pulveratum processing spray drying tower |
| CN110542332A (en) * | 2019-10-08 | 2019-12-06 | 天津五洲同创空调制冷设备有限公司 | anti-scaling clean stainless steel fin heat exchanger |
| CN209790891U (en) * | 2019-04-01 | 2019-12-17 | 无锡科伦达化工热力装备有限公司 | Improved falling film evaporator |
| CN212006239U (en) * | 2020-05-05 | 2020-11-24 | 西北农林科技大学 | Flue gas condensation heat transfer device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4511432A (en) * | 1982-09-07 | 1985-04-16 | Sephton Hugo H | Feed distribution method for vertical tube evaporation |
| CN206410565U (en) * | 2016-12-30 | 2017-08-15 | 天津中易正德科技发展有限公司 | A kind of pipe heat exchanger |
| CN111995081B (en) * | 2020-08-24 | 2022-07-12 | 吴建芳 | Non-blocking micropore aeration system |
-
2021
- 2021-04-25 CN CN202110447764.5A patent/CN113101685B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4539076A (en) * | 1982-09-27 | 1985-09-03 | Swain R L Bibb | Vapor compression distillation system |
| CN207562367U (en) * | 2017-09-30 | 2018-07-03 | 马明娥 | A kind of gummi arabicum pulveratum processing spray drying tower |
| CN209790891U (en) * | 2019-04-01 | 2019-12-17 | 无锡科伦达化工热力装备有限公司 | Improved falling film evaporator |
| CN110542332A (en) * | 2019-10-08 | 2019-12-06 | 天津五洲同创空调制冷设备有限公司 | anti-scaling clean stainless steel fin heat exchanger |
| CN212006239U (en) * | 2020-05-05 | 2020-11-24 | 西北农林科技大学 | Flue gas condensation heat transfer device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113101685A (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113101685B (en) | Falling film evaporator | |
| EP0419643B1 (en) | Process and apparatus for decoking a steam-craking installation | |
| TWI404839B (en) | Exhaust system | |
| TW442647B (en) | Air preheater cleaner | |
| JPH0590129U (en) | Device for periodically cleaning solid deposits on heat exchange tubes | |
| CN115574344B (en) | High-salt-content wastewater incineration melting cleaning process and system | |
| CN109457070A (en) | Blast furnace grain slag process steam disappears and heat recovery system | |
| CN116481356B (en) | Energy-saving tubular heat exchanger | |
| JP2881740B2 (en) | Heat exchange surface cleaning device and improved nozzle therefor | |
| CN113430001A (en) | Online heating, descaling and desanding device for oilfield wellhead produced liquid and application method thereof | |
| RU2395037C2 (en) | Regenerative heat exchanger | |
| CN104562610B (en) | Instant heating type steam purifying garment steamer | |
| CN101318650B (en) | Swinging type high temperature active coke refrigerating device | |
| CN201081583Y (en) | Rotary type high-temperature active coke cooling device | |
| CN206787377U (en) | A kind of horizontal tubular primary cooler spray tube device | |
| CN106152706A (en) | A kind of straight-line oscillation fluid bed drying oxalic acid crystal and waste gas treatment process and method | |
| CN108953757A (en) | A kind of hand outer pollution discharge type automatically cleaning valving of single valve | |
| CN209399429U (en) | A kind of multi-functional integrated range convenient for steam purge | |
| KR102237048B1 (en) | Seal pot apparatus for removing sludge | |
| BE890490A (en) | METHOD FOR CLEANING A STEAM GENERATOR WITH WATER AND MEASURING METHOD | |
| CN207856631U (en) | A kind of absorption tower | |
| CN216919148U (en) | Oil field well head produced liquid on-line heating, scale removal, sand removal device | |
| CN204737977U (en) | Evaporative cooler and converter coal gas dry process dust pelletizing system | |
| CN211725308U (en) | Waste gas recovery processing device for carbon drying kiln | |
| CN209114181U (en) | A kind of reflux unit of air flow dyeing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |