CN116983682B - Caustic soda evaporation equipment - Google Patents
Caustic soda evaporation equipment Download PDFInfo
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- CN116983682B CN116983682B CN202311257542.2A CN202311257542A CN116983682B CN 116983682 B CN116983682 B CN 116983682B CN 202311257542 A CN202311257542 A CN 202311257542A CN 116983682 B CN116983682 B CN 116983682B
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- heat exchange
- exchange tube
- evaporation
- cylinder
- fixedly connected
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 129
- 238000001704 evaporation Methods 0.000 title claims abstract description 101
- 230000008020 evaporation Effects 0.000 title claims abstract description 98
- 235000011121 sodium hydroxide Nutrition 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000004140 cleaning Methods 0.000 claims abstract description 41
- 238000007790 scraping Methods 0.000 claims description 36
- 238000004804 winding Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 229920001971 elastomer Polymers 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 11
- 235000017491 Bambusa tulda Nutrition 0.000 claims 11
- 241001330002 Bambuseae Species 0.000 claims 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 11
- 239000011425 bamboo Substances 0.000 claims 11
- 239000004744 fabric Substances 0.000 claims 4
- 239000003513 alkali Substances 0.000 abstract description 40
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 22
- 238000009826 distribution Methods 0.000 abstract description 16
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 description 14
- 239000010408 film Substances 0.000 description 11
- 239000011552 falling film Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 229920005560 fluorosilicone rubber Polymers 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0064—Feeding of liquid into an evaporator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/06—Evaporators with vertical tubes
- B01D1/065—Evaporators with vertical tubes by film evaporating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/42—Concentration; Dehydration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/08—Non-rotary, e.g. reciprocated, appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention belongs to the technical field of caustic soda preparation, in particular to caustic soda evaporation equipment, which comprises a controller and a liquid distribution cylinder, wherein a liquid inlet is arranged at the top of the liquid distribution cylinder, a water distributor is arranged at the middle of the bottom of the liquid distribution cylinder, liquid tanks are uniformly arranged at the bottom of the water distributor, an evaporation cylinder is arranged at the bottom of the liquid distribution cylinder, heat exchange pipes are uniformly arranged in the evaporation cylinder below the liquid tanks, a steam inlet is arranged above the side wall of the evaporation cylinder, a condensed water outlet is arranged below the side wall of the evaporation cylinder, a sinking cylinder is arranged at the bottom of the evaporation cylinder, and a liquid outlet is arranged at the bottom of the sinking cylinder; the invention can realize that the cleaning ring repeatedly moves up and down on the outer wall of the heat exchange tube in the alkali liquor evaporation process, so as to clean the water drops condensed on the outer wall of the heat exchange tube, and reduce the influence of the water drops on the heat exchange efficiency of the heat exchange tube.
Description
Technical Field
The invention belongs to the technical field of caustic soda preparation, and particularly relates to caustic soda evaporation equipment.
Background
Caustic soda is an important chemical substance and is commonly used in industrial and laboratory applications. Liquid caustic evaporation is a process for the preparation of caustic soda, typically carried out on an industrial scale, by reacting sodium chloride with water and lime to form a caustic soda solution, and then purifying and separating the caustic soda by evaporating water. This process requires strict control of temperature, pressure and reaction conditions to ensure purity and quality of the product, one of the common equipment used in industry for caustic soda evaporation is a falling film evaporator. Falling film evaporators are a common type of evaporation device used to evaporate solvents from a liquid mixture, thereby separating solutes.
The working principle of the falling film evaporator is as follows: the liquid flows in from the top of the device and then flows downwards along the inner wall of the heat exchange tube to form a film, and the solvent part contained in the liquid in the flowing process is vaporized due to the higher temperature of the inner wall of the heat exchange tube, so that the concentration of the solute in the solution is improved. The falling film evaporator has the advantages of uniform film formation and high heat transfer efficiency, and is suitable for treating heat-sensitive substances.
Although falling film evaporators have the advantages of high energy utilization and concentration efficiency in many industrial applications, there are also drawbacks and limitations that steam is cooled and condensed when contacting with a heat exchange tube, the problem causes the steam to form water droplets on the outer surface of the heat exchange tube, the water droplets increase with the gradual increase of the internal humidity of the falling film evaporator, the water droplets gradually gather into a water film on the outer surface of the heat exchange tube, and the existence of the water film can prevent the steam from directly heating the heat exchange tube, so that heat exchange is performed by metal and steam through the water film, but not by directly exchanging heat with the metal, thereby influencing the heat transfer efficiency and further influencing the performance and the efficiency of the evaporator.
Disclosure of Invention
In order to make up for the deficiency of the prior art, solve the above-mentioned technical problem; the invention provides caustic soda evaporation equipment.
The technical scheme adopted for solving the technical problems is as follows: the caustic soda evaporation equipment comprises a controller and a liquid distribution cylinder, wherein a liquid inlet is formed in the top of the liquid distribution cylinder, a water distributor is arranged at the middle of the bottom of the liquid distribution cylinder, liquid tanks are uniformly formed in the bottom of the water distributor, an evaporation cylinder is arranged at the bottom of the liquid distribution cylinder, heat exchange pipes are uniformly arranged in the evaporation cylinder below the liquid tanks, a steam inlet is formed above the side wall of the evaporation cylinder, a condensed water outlet is formed below the side wall of the evaporation cylinder, a sinking cylinder is arranged at the bottom of the evaporation cylinder, and a liquid outlet is formed in the bottom of the sinking cylinder, and the caustic soda evaporation equipment is characterized by further comprising:
the first fixed disc is arranged in the evaporation cylinder, is fixedly connected with the side wall of the evaporation cylinder, is positioned at one end of the heat exchange tube close to the water distributor, is fixedly connected with the heat exchange tube, and is communicated with the liquid tank through a liquid outlet tube;
the second fixed disc is arranged in the evaporation cylinder and fixedly connected with the side wall of the evaporation cylinder, and is positioned at one end of the heat exchange tube far away from the water distributor and fixedly connected with the heat exchange tube;
the electric wire winding devices are arranged on the first fixed disc, two electric wire winding devices are symmetrically arranged outside each heat exchange tube, and the electric wire winding devices are controlled by the controller;
one end of the first connecting wire is wound on the electric wire winding device;
the cleaning ring is sleeved on the heat exchange tube, the other end of the first connecting wire penetrates through the first fixed disc and is fixedly connected with the top of the cleaning ring, and more than one air holes are formed in the side face of the cleaning ring;
the filter disc is positioned below the second fixed disc and is fixedly connected with the side wall of the sinking cylinder;
the guide cylinders are uniformly arranged on the filter disc and correspond to the opening positions of the heat exchange tubes one by one, and the inner diameter of each guide cylinder is larger than that of each heat exchange tube;
the liquid outlet holes are symmetrically formed on the side wall of the guide cylinder, and the openings of the liquid outlet holes are inclined downwards;
the fixing frames are arranged on the filter disc, two fixing frames form a group of fixing parts, and two groups of fixing parts are fixed outside each guide cylinder;
the wire collecting shaft is characterized in that one end of the wire collecting shaft penetrates through two fixing frames in the group of fixing parts and then is rotationally connected with the fixing frames, a wire collecting groove is formed in the other end of the wire collecting shaft, a second connecting wire is wound on the wire collecting groove, and the second connecting wire penetrates through the second fixing disc and then is fixedly connected with the bottom of the cleaning ring;
the water wheel is fixedly connected between the adjacent fixing frames through the winding shaft, is arranged between the adjacent fixing frames and is fixed with the winding shaft, and the water wheel is positioned below the liquid outlet and is used for driving the winding shaft to rotate.
Optionally, the caustic soda evaporation apparatus further comprises:
the temperature sensing element is fixedly connected to the bottom surface of the guide cylinder and contracts when encountering heat;
the mounting disc is fixedly connected with one end of the temperature sensing element, which is far away from the guide cylinder;
the annular scraping plate is connected with the side face of the mounting plate through uniformly arranged connecting rods, and the outer end face of the annular scraping plate is in contact with the heat exchange tube and is in sliding connection with the heat exchange tube;
the annular scraping plate is positioned at the top end inside the heat exchange tube in an initial state, and the annular scraping plate is driven to move from top to bottom inside the heat exchange tube through the mounting disc and the connecting rod when the temperature sensing element is heated and contracted.
Optionally, the temperature sensing element is memory metal, after the memory metal is heated and contracted, the annular scraping plate is driven to extend out of the bottom end inside the heat exchange tube through the mounting disc and the connecting rod.
Optionally, an annular collecting bag is arranged between the mounting plate and the annular scraping plate, the outer layer of the annular collecting bag is fixedly connected with the annular scraping plate, and the inner layer of the annular collecting bag is fixedly connected with the mounting plate.
Optionally, the steam inlet is located the first fixed disk below, and the quantity is four, evenly sets up on the evaporating drum lateral wall.
Optionally, the filter plate includes steel filter screen and steel ring, evenly be fixed with the fixed block on the sinking cylinder lateral wall, the one end and the steel filter screen of steel ring are fixed, and the other end passes through bolt fixed connection with the fixed block.
Optionally, an access window is provided on the side wall of the sinking barrel, one end of the access window is hinged on the side wall of the sinking barrel through a hinge, and a rubber ring is provided between the access window and the sinking barrel for sealing.
Optionally, the annular scraping plate is made of corrosion-resistant rubber, and the cleaning ring is made of corrosion-resistant rubber.
The beneficial effects of the invention are as follows:
1. according to the caustic soda evaporation equipment, the electric wire collector, the liquid outlet hole, the water wheel, the first connecting wire, the second connecting wire and the electric wire collector are matched with each other, so that the cleaning ring can repeatedly move up and down on the outer wall of the heat exchange tube in the evaporation process, water drops condensed on the outer wall of the heat exchange tube are cleaned, the influence of the water drops on the heat exchange efficiency of the heat exchange tube is reduced, and the working efficiency of the caustic soda evaporation equipment is improved.
2. According to the caustic soda evaporation equipment, the heat-sensitive element in the heat exchange tube is matched with steam to realize pre-cleaning of the inner wall of the heat exchange tube, impurities on the inner wall of the heat exchange tube are reduced in the process, interference of the impurities on an alkali solution film forming process is prevented, product quality and production efficiency are guaranteed, and after alkali solution evaporation is finished, the heat-sensitive element is gradually stretched to an initial state through natural cooling, so that the annular scraping plate can clean the inner wall of the heat exchange tube again.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an internal block diagram of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a perspective view of a water distributor in the present invention;
FIG. 5 is a cross-sectional view of a filter tray in accordance with the present invention;
FIG. 6 is a diagram showing the operation of the temperature sensing element in the initial state of the invention;
FIG. 7 is a state diagram of the temperature sensing element of the present invention in operation;
FIG. 8 is an enlarged view of a portion of the invention at A;
FIG. 9 is an enlarged view of a portion of the present invention at B;
fig. 10 is a partial enlarged view of the present invention at C.
In the figure: 1. a liquid distribution cylinder; 101. a liquid inlet; 102. a water distributor; 103. a liquid tank; 2. an evaporation cylinder; 201. a steam inlet; 202. a condensed water outlet; 3. a heat exchange tube; 4. a sinking cylinder; 401. a liquid outlet; 5. a first fixed plate; 6. a second fixed disk; 7. an electric wire winder; 8. a filter tray; 801. a steel filter screen; 802. a steel ring; 9. a first connecting wire; 10. a second connecting wire; 11. a guide cylinder; 12. a liquid outlet hole; 13. a fixing frame; 14. a reel is taken up; 15. cleaning the ring; 16. a water wheel; 17. a temperature sensing element; 18. a mounting plate; 19. an annular scraping plate; 20. an annular collection bag; 21. an access panel; 22. a fixed block; 23. a connecting rod; 24. and (5) ventilation holes.
Detailed Description
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
In order to solve the problems in the background technology of the invention, the invention designs caustic soda evaporation equipment, the core of which is that through the mutual cooperation of an electric wire collector 7, a liquid outlet 12, a water wheel 16, a first connecting wire 9, a second connecting wire 10 and the electric wire collector 7, a cleaning ring 15 is realized to repeatedly move up and down on the outer wall of a heat exchange tube 3 in the evaporation process, and the condensation water drops on the outer wall of the heat exchange tube 3 are cleaned, and the specific structure and principle are as follows:
as shown in fig. 1 to 10, the caustic soda evaporation equipment comprises a controller and a liquid distribution cylinder 1, wherein a liquid inlet 101 is arranged at the top of the liquid distribution cylinder 1, a water distributor 102 is arranged at the middle of the bottom of the liquid distribution cylinder 1, a liquid tank 103 is uniformly arranged at the bottom of the water distributor 102, an evaporation cylinder 2 is arranged at the bottom of the liquid distribution cylinder 1, heat exchange pipes 3 are uniformly arranged in the evaporation cylinder 2 below the liquid tank 103, a steam inlet 201 is arranged above the side wall of the evaporation cylinder 2, a condensed water outlet 202 is arranged below the side wall of the evaporation cylinder 2, a sinking cylinder 4 is arranged at the bottom of the evaporation cylinder 2, a liquid outlet 401 is arranged at the bottom of the sinking cylinder 4, and the liquid distribution cylinder 1, the evaporation cylinder 2 and the sinking cylinder 4 form the caustic soda evaporation cylinder;
the first fixed disc 5 is arranged in the evaporation cylinder 2, is fixedly connected with the side wall of the evaporation cylinder 2, is positioned at one end of the heat exchange tube 3 close to the water distributor 102, is fixedly connected with the heat exchange tube 3, and is communicated with the liquid tank 103 through a liquid outlet tube;
the second fixed disc 6 is arranged in the evaporation cylinder 2, is fixedly connected with the side wall of the evaporation cylinder 2, is positioned at one end of the heat exchange tube 3 far away from the water distributor 102, and is fixedly connected with the heat exchange tube 3;
the electric wire winding devices 7 are arranged on the first fixed disc 5, two electric wire winding devices 7 are symmetrically arranged outside each heat exchange tube 3, and the electric wire winding devices 7 are controlled by a controller;
a first connecting wire 9, one end of which is wound on the electric wire winder 7;
the cleaning ring 15 is sleeved on the heat exchange tube 3, the other end of the first connecting wire 9 passes through the first fixed disc 5 and is fixedly connected with the top of the cleaning ring 15, and more than one air holes 24 are formed in the side surface of the cleaning ring 15;
the filter disc 8 is positioned below the second fixed disc 6, and the filter disc 8 is fixedly connected with the side wall of the sinking cylinder 4;
the guide drums 11 are uniformly arranged on the filter discs 8 and correspond to the opening positions of the heat exchange tubes 3 one by one, and the inner diameter of each guide drum 11 is larger than that of each heat exchange tube 3;
the liquid outlet holes 12 are symmetrically formed on the side wall of the guide cylinder 11, and the openings are inclined downwards;
the fixing frames 13 are arranged on the filter disc 8, two fixing frames 13 form a group of fixing parts, and two groups of fixing parts are fixed outside each guide cylinder 11;
a wire collecting shaft 14, one end of which passes through two fixing frames 13 in a group of fixing parts and then is rotationally connected with the fixing frames 13, the other end of which is provided with a wire collecting groove, a second connecting wire 10 is wound on the wire collecting groove, and the second connecting wire 10 passes through a second fixing disc 6 and then is fixedly connected with the bottom of a cleaning ring 15;
the water wheel 16 is fixedly connected between the adjacent fixing frames 13 through the winding shaft 14, is arranged between the adjacent fixing frames 13 and is fixed with the winding shaft 14, and the water wheel 16 is positioned below the liquid outlet hole 12 and is used for driving the winding shaft 14 to rotate;
when the alkali liquor is required to be evaporated, firstly, steam is introduced into the evaporation cylinder 2 through the steam inlet 201, the steam is generated by the steam generator, the steam can be introduced into the evaporation cylinder 2 through a hose from the steam generator, condensed water formed by the steam in the evaporation cylinder 2 is discharged through the condensed water outlet 202, and the steam is continuously introduced into the evaporation cylinder 2 until the alkali liquor is evaporated;
simultaneously, alkali liquor enters the liquid distribution cylinder 1 from the liquid inlet 101, then under the action of the water distributor 102, the alkali liquor uniformly flows into the heat exchange tubes 3 from the liquid tank 103, the alkali liquor flows downwards along the inner walls of the plurality of heat exchange tubes 3 under the action of gravity, a water film is formed on the inner walls of the heat exchange tubes 3, the alkali liquor begins to evaporate in the flowing process, water in the alkali liquor is evaporated in the flowing process along the inner walls of the heat exchange tubes 3, so that alkali liquor with higher concentration is obtained, the alkali liquor flows out of the inner walls of the heat exchange tubes 3 and then enters the guide cylinder 11 and then flows out of the liquid outlet 12 of the guide cylinder 11, at the moment, the alkali liquor is led to the water outlet 12 by the water wheel 16, the water wheel 16 is pushed to rotate, the rotating water wheel 16 drives the wire collecting shaft 14 to rotate, the rotating wire collecting shaft 14 winds the second connecting wire 10 onto the wire collecting groove, the second connecting wire 10 drives the cleaning ring 15 positioned at the top of the heat exchange tubes 3 to move downwards, and the cleaning ring 15 cleans water drops condensed on the outer walls of the heat exchange tubes 3 in the moving downwards process;
when the cleaning ring 15 moves to the bottom of the heat exchange tube 3, the controller starts the electric wire collector 7, the electric wire collector 7 pulls the cleaning ring 15 upwards through the first connecting wire 9, the cleaning ring 15 moves from the bottom of the heat exchange tube 3 to the top, at the moment, the electric wire collector 7 stops collecting wires, and because alkali liquor continuously washes the water wheel 16 under the guidance of the liquid outlet 12 in the process, the water wheel 16 continuously provides pull-down power for the second connecting wire 10, when the electric wire collector 7 stops collecting wires, the cleaning ring 15 moves downwards, and the process that the cleaning ring 15 moves up and down on the outer wall of the heat exchange tube 3 circulates until the alkali liquor is evaporated;
further, when the steam is continuously introduced into the evaporation cylinder 2, the cleaning ring 15 moves up and down on the heat exchange tube 3 regularly, condensed water drops possibly enter a gap between the cleaning ring 15 and the heat exchange tube 3, and the air holes 24 are arranged to enable the water drops to flow out of the gap through the air holes 24 on one hand, and on the other hand, the direct contact of the steam and the heat exchange tube 3 through the air holes 24 is facilitated, so that the influence of the water drops on the heat exchange of the heat exchange tube 3 is reduced, and the production efficiency is improved;
in actual use, a small amount of alkali liquor escapes from the heat exchange tube 3 and forms impurities on the outer wall of the heat exchange tube 3, and the outer wall of the heat exchange tube 3 is cleaned in the prior art, usually after evaporation is finished, chemical lotion is introduced into the evaporation cylinder 2 or impurities on the outer wall are cleaned through a high-pressure water gun; in contrast, the invention can clean the outer wall of the heat exchange tube 3 in real time in the alkali liquor evaporation process, not only can avoid forming impurities, but also can clean water drops formed on the outer wall of the heat exchange tube 3 by steam, reduce the influence of the water drops on the heat exchange efficiency of the heat exchange tube 3, and further improve the working efficiency of the caustic soda evaporation equipment.
It should be noted that, the controller for controlling the electric wire-rewinding machine 7 may be a PLC controller, which may convert an instruction such as start or stop into an instruction that can be identified by the electronic control system, so as to control the motor in the electric wire-rewinding machine 7 to start or stop, thereby realizing rotation of the wire-rewinding roller or the wire-rewinding disc in the electric wire-rewinding machine 7, and further realizing winding of the first connecting wire 9 on the surface of the wire-rewinding roller or the wire-rewinding disc in the electric wire-rewinding machine 7, where the PLC controller is a conventional control system in the prior art, and not described herein too, other controllers, such as a single-chip controller, may be used.
As a preferred embodiment of the present invention, the caustic soda evaporation apparatus further comprises:
the temperature sensing element 17 is fixedly connected to the bottom surface of the guide cylinder 11, and the temperature sensing element 17 contracts when encountering heat;
the mounting plate 18 is fixedly connected with one end of the temperature sensing element 17, which is far away from the guide cylinder 11;
the annular scraper 19 is connected with the side surface of the mounting plate 18 through uniformly arranged connecting rods 23, and the outer end surface of the annular scraper 19 is contacted with the heat exchange tube 3 and is in sliding connection with the heat exchange tube;
the annular scraping plate 19 is positioned at the top end inside the heat exchange tube 3 in the initial state, and when the temperature sensing element 17 is heated and contracted, the annular scraping plate 19 is driven to move from top to bottom at the top end inside the heat exchange tube 3 through the mounting disc 18 and the connecting rod 23;
the temperature sensing element 17 is made of memory metal, and the memory metal is heated and contracted to drive the annular scraping plate 19 to extend out from the bottom end of the interior of the heat exchange tube 3 through the mounting disc 18 and the connecting rod 23;
an annular collecting bag 20 is arranged between the mounting plate 18 and the annular scraping plate 19, the outer layer of the annular collecting bag 20 is fixedly connected with the annular scraping plate 19, and the inner layer of the annular collecting bag 20 is fixedly connected with the mounting plate 18;
before alkali liquor is introduced into caustic soda evaporation equipment, the caustic soda evaporation equipment is preheated, steam is firstly introduced into an evaporation cylinder 2, at the moment, a temperature sensing element 17 positioned in a heat exchange tube 3 gradually contracts along with the gradual temperature rise of the heat exchange tube 3, the temperature sensing element 17 drives an annular scraping plate 19 through a mounting plate 18 and a connecting rod 23, the top end inside the heat exchange tube 3 moves from top to bottom, the outer end face of the annular scraping plate 19 is in contact with the heat exchange tube 3 and is in sliding connection with the heat exchange tube 3, in the process of moving the annular scraping plate 19 up to bottom, the annular scraping plate 19 scrapes impurities existing on the inner wall of the heat exchange tube 3, the pre-cleaning of the inner wall of the heat exchange tube 3 is realized, the impurities scraped by the annular scraping plate 19 fall into an annular collecting bag 20, and after the temperature sensing element 17 is heated and contracted, the annular scraping plate 19 is driven to extend out from the bottom end inside the heat exchange tube 3 through the mounting plate 18 and the connecting rod 23, so that the annular scraping plate 19 is prevented from being detained in the inner wall of the heat exchange tube 3, and film forming of the alkali liquor flowing through the inner wall of the heat exchange tube 3 is influenced;
after the preheating is finished, alkali liquor is introduced into the liquid distribution cylinder 1 through the liquid inlet 101, the alkali liquor flows from the heat exchange tube 3 to the guide cylinder 11, the alkali liquor begins to evaporate in the flowing process, so that water in the alkali liquor is partially evaporated, the concentration of the alkali liquor is improved, the concentrated alkali liquor impacts the water wheel 16 from the liquid outlet 12 of the guide cylinder 11 and then flows to the liquid outlet 401 through the filter disc 8;
after the alkali liquor evaporation is finished, stopping introducing steam into the evaporation cylinder 2, introducing cleaning liquid into the caustic soda evaporation equipment through the liquid inlet 101, gradually cooling the caustic soda evaporation equipment at the moment, gradually restoring the contact of the temperature sensing element 17 and the cold cleaning liquid to the original form, driving the annular scraping plate 19 to move up from the inside of the heat exchange tube 3 to one end of the heat exchange tube 3 close to the first fixed disc 5, and cleaning the inner wall of the heat exchange tube 3 again by the annular scraping plate 19, wherein the method is an optional method for stretching the temperature sensing element 17 back to the original form, and also can gradually stretch the temperature sensing element 17 to the original state through natural cooling after the alkali liquor evaporation is finished, so that the annular scraping plate 19 can clean the inner wall of the heat exchange tube 3 again;
the memory metal forming the heat-shrinkable temperature sensing element 17 can be nickel-titanium alloy, and in actual use, the nickel-titanium alloy is made into the temperature sensing element 17, so that the temperature sensing element 17 can stretch out and draw back when heated, the annular scraping plate 19 is driven to move downwards by the temperature sensing element 17, and therefore the inner wall of the heat exchange tube 3 is cleaned, and the heat exchange efficiency of the heat exchange tube 3 is improved;
on one hand, the process can ensure that the heat exchange tube 3 reaches the required evaporation temperature before the alkali liquor enters the heat exchange tube 3, thereby ensuring the stability and high efficiency of subsequent reaction or treatment; on the other hand, the steam is matched with the temperature sensing element 17 in the heat exchange tube 3 to realize the pre-cleaning of the inner wall of the heat exchange tube, so that impurities on the inner wall of the heat exchange tube 3 are reduced in the process, the interference of the impurities on the alkali liquor film forming process is prevented, and the product quality and the production efficiency are ensured;
meanwhile, the annular collecting bag 20 can further reduce the influence of impurities on alkali liquor film formation;
in general, in the process of preheating caustic soda evaporation equipment by introducing steam in the early stage, the invention realizes the pre-cleaning of the inner wall of the heat exchange tube 3 through the heat shrinkage of the temperature sensing element 17, provides kinetic energy for the water wheel 16 through the alkali liquor in the middle stage of evaporating the alkali liquor to pull the cleaning ring 15 to move downwards, and cooperates with the intermittent operation of the electric wire collector 7 to realize the cleaning of the outer wall of the heat exchange tube 3 by the cleaning ring 15 moving up and down on the outer wall of the heat exchange tube 3 in a circulating way at a stable speed; after the later alkali liquor is evaporated, the temperature sensing element 17 gradually stretches back to the original form along with the gradual cooling of the whole temperature of the caustic soda evaporation equipment, so that the inner wall of the heat exchange tube 3 is cleaned again; the cleaning of the inside and the outside of the heat exchange tube 3 is realized in the three stages of front, middle and back, the heat exchange efficiency of the heat exchange tube 3 is improved, and the working efficiency of caustic soda evaporation equipment is improved; compared with the prior art, the invention has simple structure, and the inner wall and the outer wall of the heat exchange tube 3 are cleaned in a simple way, and compared with the prior art with the publication number CN113941164B, the invention cleans the inner wall of the heat exchange tube 3 after evaporation is finished, and the invention cleans the outer wall of the heat exchange tube 3 in real time in the evaporation process and cleans the inside of the heat exchange tube 3 before and after evaporation with a simpler structure.
As a preferred embodiment of the present invention, the steam inlets 201 are located below the first fixed disk 5, and four in number are uniformly arranged on the side wall of the evaporation cylinder 2. Specifically, in order to prevent the temperature sensing element 17 from being heated unevenly, so that the temperature sensing element 17 in the heat exchange tube 3 is contracted below the second fixed disc 6, part of the temperature sensing element 17 is still positioned in the heat exchange tube 3, so that part of the heat exchange tube 3 cannot meet the requirement of alkali solution film formation when alkali solution is subsequently introduced, and four steam inlets 201 are uniformly arranged on the side wall of the evaporation cylinder 2, so that the situation can be avoided;
it should be noted that: in order to ensure that the heat exchange tubes 3 are heated uniformly, the number of the steam inlets 201 can be adjusted correspondingly according to the actual diameter of the evaporation cylinder 2.
As a preferred embodiment of the present invention, the filter disc 8 includes a steel filter screen 801 and a steel ring 802, the side wall of the sinking cylinder 4 is uniformly fixed with a fixing block 22, one end of the steel ring 802 is fixed with the steel filter screen 801, and the other end is fixedly connected with the fixing block 22 through a bolt;
an access window 21 is formed in the side wall of the sinking cylinder 4, one end of the access window 21 is hinged to the side wall of the sinking cylinder 4 through a hinge, and a rubber ring is arranged between the access window 21 and the sinking cylinder 4 and used for sealing; the annular scraping plate 19 and the cleaning ring 15 are made of corrosion-resistant rubber.
Specifically, during the process of moving from the top end to the bottom end inside the heat exchange tube 3, a part of impurities inevitably fall outside the annular collecting bag 20, and during the subsequent flushing of the cleaning liquid, impurities fall on the filter disc 8, and the steel filter screen 801 allows the evaporated and concentrated alkali liquor to flow through and filters the impurities; after evaporation is finished, a worker can enter caustic soda evaporation equipment through an access window 21, and can remove the second connecting wire 10 from the wire collecting groove by disassembling bolts, so that the filter disc 8, the guide cylinder 11, the temperature sensing element 17, the annular collecting bag 20 and the like which are fixed through the filter disc 8 are cleaned, maintained and replaced; in general, the filter disc 8 is in threaded connection with the side wall of the sinking cylinder 4 through the fixing block 22, so that the subsequent disassembly and replacement are facilitated, and meanwhile, the filter disc 8 manufactured by the steel filter screen 801 also meets the function of filtering impurities;
furthermore, because the alkali liquor has stronger corrosiveness, the rubber ring, the annular scraping plate 19 and the cleaning ring 15 are all made of corrosion-resistant rubber, the corrosion-resistant rubber can be flexible materials such as silicon rubber, fluorosilicone rubber, fluororubber and the like, meanwhile, the arrangement of the rubber ring prevents the alkali liquor from seeping out of the access window 21 to influence the evaporation of caustic soda, and the parts, such as the water wheel 16, the guide cylinder 11, the heat exchange tube 3, the first connecting wire 9 and the like, in the caustic soda evaporation equipment contacted with the alkali liquor need to be sprayed with smooth corrosion-resistant materials, and the smooth corrosion-resistant materials can be N55 paint, NK77 paint or LD67 paint and the like; the smoothness of the spraying material prevents alkali liquor from remaining on the surfaces of internal parts of the caustic soda evaporation equipment, and meanwhile, the corrosion resistance of the spraying material also improves the service life of the caustic soda evaporation equipment.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. Caustic soda evaporation equipment, including controller and cloth liquid section of thick bamboo (1), inlet (101) are installed at cloth liquid section of thick bamboo (1) top, water distributor (102) are installed in the middle of cloth liquid section of thick bamboo (1) bottom, cistern (103) have evenly been seted up to water distributor (102) bottom, evaporation section of thick bamboo (2) are installed to cloth liquid section of thick bamboo (1) bottom, evenly install heat exchange tube (3) in evaporation section of thick bamboo (2) below cistern (103), evaporation section of thick bamboo (2) lateral wall top is equipped with steam inlet (201), evaporation section of thick bamboo (2) lateral wall below is equipped with comdenstion water export (202), sinking section of thick bamboo (4) are installed to evaporation section of thick bamboo (2) bottom, liquid outlet (401) are installed to sinking section of thick bamboo (4) bottom, its characterized in that still includes:
the first fixed disc (5) is arranged in the evaporation cylinder (2), is fixedly connected with the side wall of the evaporation cylinder (2), is positioned at one end of the heat exchange tube (3) close to the water distributor (102), is fixedly connected with the heat exchange tube (3), and is communicated with the liquid tank (103) through a liquid outlet tube;
the second fixed disc (6) is arranged in the evaporation cylinder (2), is fixedly connected with the side wall of the evaporation cylinder (2), and is positioned at one end of the heat exchange tube (3) far away from the water distributor (102) and is fixedly connected with the heat exchange tube (3);
the electric wire winding devices (7) are arranged on the first fixed disc (5), two electric wire winding devices (7) are symmetrically arranged outside each heat exchange tube (3), and the electric wire winding devices (7) are controlled by a controller;
a first connecting wire (9), one end of which is wound on the electric wire winding device (7);
the cleaning ring (15) is sleeved on the heat exchange tube (3), the other end of the first connecting wire (9) penetrates through the first fixed disc (5) and is fixedly connected with the top of the cleaning ring (15), and more than one air hole (24) is formed in the side surface of the cleaning ring (15);
the filter disc (8) is positioned below the second fixed disc (6), and the filter disc (8) is fixedly connected with the side wall of the sinking cylinder (4);
the guide cylinders (11) are uniformly arranged on the filter disc (8) and correspond to the opening positions of the heat exchange tubes (3) one by one, and the inner diameter of each guide cylinder (11) is larger than that of each heat exchange tube (3);
the liquid outlet holes (12) are symmetrically formed on the side wall of the guide cylinder (11), and the openings are inclined downwards;
the fixing frames (13) are arranged on the filter disc (8), two fixing frames (13) form a group of fixing parts, and two groups of fixing parts are fixed outside each guide cylinder (11);
a wire collecting shaft (14), one end of which passes through two fixing frames (13) in a group of fixing parts and is rotationally connected with the fixing frames (13), the other end of which is provided with a wire collecting groove, a second connecting wire (10) is wound on the wire collecting groove, and the second connecting wire (10) passes through a second fixing disc (6) and is fixedly connected with the bottom of a cleaning ring (15);
the water wheels (16) are fixedly connected between the adjacent fixing frames (13) through the winding shafts (14), are arranged between the adjacent fixing frames (13) and are fixed with the winding shafts (14), and the water wheels (16) are positioned below the liquid outlet holes (12) and are used for driving the winding shafts (14) to rotate.
2. The caustic soda evaporation apparatus of claim 1, further comprising:
the temperature sensing element (17) is fixedly connected to the bottom surface of the guide cylinder (11), and the temperature sensing element (17) contracts when encountering heat;
the mounting disc (18) is fixedly connected with one end of the temperature sensing element (17) far away from the guide cylinder (11);
the annular scraping plates (19) are connected with the side surfaces of the mounting plates (18) through connecting rods (23) which are uniformly arranged, and the outer end surfaces of the annular scraping plates (19) are contacted with the heat exchange tubes (3) and are in sliding connection with the heat exchange tubes;
the annular scraping plate (19) is positioned at the top end inside the heat exchange tube (3) in an initial state, and the annular scraping plate (19) is driven to move from top to bottom inside the heat exchange tube (3) through the mounting disc (18) and the connecting rod (23) when the temperature sensing element (17) is heated and contracted.
3. A caustic soda evaporation apparatus according to claim 2, characterized in that: the temperature sensing element (17) is made of memory metal, and the memory metal is heated and contracted to drive the annular scraping plate (19) to extend out of the bottom end inside the heat exchange tube (3) through the mounting disc (18) and the connecting rod (23).
4. A caustic soda evaporation apparatus according to claim 3, wherein: an annular collecting bag (20) is arranged between the mounting plate (18) and the annular scraping plate (19), the outer layer of the annular collecting bag (20) is fixedly connected with the annular scraping plate (19), and the inner layer of the annular collecting bag (20) is fixedly connected with the mounting plate (18).
5. The caustic soda evaporation apparatus of claim 4, wherein: the steam inlets (201) are arranged below the first fixed disc (5), the number of the steam inlets is four, and the steam inlets are uniformly arranged on the side wall of the evaporation cylinder (2).
6. The caustic soda evaporation apparatus according to claim 5, wherein: the filter disc (8) comprises a steel filter screen (801) and a steel ring (802), wherein a fixed block (22) is uniformly fixed on the side wall of the sinking cylinder (4), one end of the steel ring (802) is fixed with the steel filter screen (801), and the other end of the steel ring is fixedly connected with the fixed block (22) through a bolt.
7. The caustic soda evaporation apparatus of claim 6, wherein: an access window (21) is formed in the side wall of the sinking barrel (4), one end of the access window (21) is hinged to the side wall of the sinking barrel (4) through a hinge, and a rubber ring is arranged between the access window (21) and the sinking barrel (4) and used for sealing.
8. The caustic soda evaporation apparatus of claim 7, wherein: the annular scraping plate (19) is made of corrosion-resistant rubber, and the cleaning ring (15) is made of corrosion-resistant rubber.
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| CN202311257542.2A CN116983682B (en) | 2023-09-27 | 2023-09-27 | Caustic soda evaporation equipment |
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| CN202311257542.2A CN116983682B (en) | 2023-09-27 | 2023-09-27 | Caustic soda evaporation equipment |
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| CN116983682B true CN116983682B (en) | 2023-11-28 |
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| CN118370998B (en) * | 2024-06-21 | 2024-09-24 | 包头海平面高分子工业有限公司 | Evaporation system based on caustic soda production process |
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