CN219743926U - Transformation device for mechanical recompression evaporation by triple-effect evaporation - Google Patents
Transformation device for mechanical recompression evaporation by triple-effect evaporation Download PDFInfo
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- CN219743926U CN219743926U CN202321210033.XU CN202321210033U CN219743926U CN 219743926 U CN219743926 U CN 219743926U CN 202321210033 U CN202321210033 U CN 202321210033U CN 219743926 U CN219743926 U CN 219743926U
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- 238000001704 evaporation Methods 0.000 title claims abstract description 71
- 230000008020 evaporation Effects 0.000 title claims abstract description 68
- 230000009466 transformation Effects 0.000 title claims abstract description 14
- 230000000694 effects Effects 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 22
- 238000009834 vaporization Methods 0.000 claims description 13
- 230000008016 vaporization Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 6
- 210000001503 joint Anatomy 0.000 claims 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 abstract description 10
- 229910052808 lithium carbonate Inorganic materials 0.000 abstract description 10
- 239000012452 mother liquor Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 13
- 150000003839 salts Chemical class 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model relates to a transformation device for mechanical recompression evaporation of lithium carbonate mother liquor by three-effect evaporation, which is at least provided with three groups of heaters, three groups of separators, a preheater and a vapor compressor. The transformation device for mechanical recompression evaporation by three-effect evaporation provided by the utility model can reduce the consumption of raw steam, the lower evaporation temperature can effectively avoid the phenomenon of tube array scaling of the device, the evaporation efficiency is improved, and the evaporation cost is reduced.
Description
Technical Field
The utility model relates to the technical field of mechanical recompression evaporation, in particular to an evaporation transformation device for transforming mechanical recompression by three-effect evaporation energy-saving transformation.
Background
The lithium carbonate EMD production link comprises the working procedures of raw material washing, conversion, precise filtration, carbonization, dehydration, drying, crushing, packaging and pervaporation, and the process principle adopts a reaction type; li (Li) 2 CO 3 +CaO+H 2 O＝2LiOH+CaCO 3 ，2LiOH+CO 2 ＝Li 2 CO 3 +H 2 O. Generating mother liquor 50m in daily 3 After the concentration treatment, the concentrated mother liquor is evaporated and crystallized for 20m 3/day, and lithium carbonate is recovered.
In the prior art, the publication No. CN202105623U relates to this technology, and the disclosed lithium carbonate mother liquor triple effect evaporation device is generally similar to the conventional lithium carbonate mother liquor triple effect evaporation device on the market at present. Mainly comprises; the device consists of a pretreatment device, a first-effect evaporator, a second-effect evaporator, a third-effect evaporator and a crystallization tank which are connected in sequence through pipes, wherein an anti-blocking device is arranged between the third-effect evaporator and the crystallization tank, and the first-effect evaporator, the second-effect evaporator and the third-effect evaporator are respectively connected to a steam generating device through pipes to realize operation.
However, the prior art has some problems that the high demand of primary steam leads to high energy consumption of production, even 1 ton of water consumes 0.4-0.6 ton of steam and 25-40 DEG, the one-effect evaporation temperature is high (110-120 ℃), the phenomenon of scaling of the pipeline of the device frequently occurs, and the evaporation cost is high.
Disclosure of Invention
The utility model aims to provide a transformation device for mechanical recompression evaporation by three-effect evaporation, which aims to solve the problems of high production energy consumption, frequent scaling phenomenon and high evaporation cost caused by high demand of primary steam in the background technology.
Accordingly, another technical problem to be solved by the utility model is to provide a more reliable method for performing mechanical recompression evaporation by three-effect evaporation of lithium carbonate mother liquor.
In order to achieve the above object, the present utility model provides a method for solving the above technical problems, comprising the steps of; a method for mechanically recompression evaporating lithium carbonate mother liquor includes such steps as passing raw steam through preheater, delivering raw material in raw material tank to preheater by feed pump, heating the raw material in preheater, loading it in one-effect separator and heater, preheating the liquid with two-three effect by raw steam, starting up steam compressor, extracting secondary steam from two-three effect separator, and heating the liquid by Roots type steam compressor.
As the improvement of the method for carrying out mechanical recompression evaporation by the three-effect evaporation of the lithium carbonate mother liquor; the temperature and pressure of the secondary steam are improved by compressing and acting on the low-temperature and low-pressure secondary steam recovered by the heat recovery system through a steam compressor, and converting electric energy into heat energy.
As the improvement of the method for carrying out mechanical recompression evaporation by the three-effect evaporation of the lithium carbonate mother liquor; the outlet of the separator is provided with a vapor-liquid separator, and the vapor-water separation of the residual moisture in the secondary steam is realized by the centrifugal action in the operation of the vapor-liquid separator.
In the case of a retrofit device for mechanical recompression evaporation with triple effect evaporation; the utility model relates to equipment for solving the technical problems by using triple-effect evaporation to carry out a mechanical recompression evaporation method, which comprises a heater, a separator and a preheater, wherein the preheater is connected and fixed with an effective heater through a pipeline, three groups of heaters and three groups of separators are respectively connected with a forced circulation pump and a pipeline, and a vapor compressor and a communicating pipe are assembled between the effective heater and the double-effect heater to realize opposite connection.
The device is further improved by mechanical recompression evaporation transformation as three-effect evaporation; the heater comprises a one-effect heater, a two-effect heater and a three-effect heater, and the separator comprises a one-effect separator, a two-effect separator and a three-effect separator.
The device is further improved by mechanical recompression evaporation transformation as three-effect evaporation; the first-effect separator, the second-effect separator and the third-effect separator are sequentially connected by a communicating pipe, liquid level sensor feedback liquid level is assembled at the joint, and a valve is assembled on the communicating pipe through a bolt to start and stop feeding.
The device is further improved by mechanical recompression evaporation transformation as three-effect evaporation; and a concentrate pump is arranged at the bottom of the three-effect separator, and the concentrate pump conveys crystals generated by evaporation concentration to a centrifugal machine for separation.
The device is further improved by mechanical recompression evaporation transformation as three-effect evaporation; the vapor compressor is a Roots type vapor compressor, and the vapor compressor compresses vapor generated by the first-effect separator, the second-effect separator and the third-effect separator, thereby improving the pressure and the temperature of secondary vapor.
The device is further improved by mechanical recompression evaporation transformation as three-effect evaporation; the forced circulation pump is provided with a heater, the inlet is connected with the separator through a communicating pipe, and the water condensed in the preheater and the heater is conveyed to the water storage tank through a condensate pump for recovery treatment.
Compared with the prior art, the utility model has the beneficial effects that; the secondary steam recovered by the mechanical recompression evaporator is used for heating the feed liquid after being pressurized and heated, so that the demand of primary steam can be effectively reduced, the production energy consumption of the primary steam is reduced, and meanwhile, the raw material is preheated by the preheater, so that the residence time of the feed liquid in the evaporator can be shortened. The mechanical recompression evaporator is utilized to extract the secondary steam in the separator, the boiling point (about 90 ℃) of the feed liquid in the separator is reduced, the concentration work can be completed at a lower temperature, the phenomenon of tube array scaling of the device can be effectively avoided, and the evaporation cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a modified device for mechanical recompression evaporation by triple effect evaporation according to the present utility model;
FIG. 2 is a process flow diagram according to the present utility model;
reference numerals illustrate;
1-heater, 2-separator, 3-preheater, 4-vapor compressor, 5-forced circulation pump, 6-electric instrument, 7-valve, 8-pipeline, 9-communicating pipe, 10-level sensor, 11-one effect heater, 12-two effect heater, 13-three effect heater, 14-concentrate pump, 21-one effect separator, 22-two effect separator, 23-three effect separator.
Detailed Description
For the purpose of promoting an understanding of the principles of the utility model, reference will now be made in detail to the embodiments described herein, including examples, illustrated in the accompanying drawings.
The method for carrying out mechanical recompression evaporation by three-effect evaporation of lithium carbonate mother liquor mainly comprises the following steps of; the method adopts a reforming device, the device is provided with at least three groups of heaters, three groups of separators, a preheater and a vapor compressor, raw steam is conveyed into the preheater through a feed pump by passing through the preheater, raw materials in a raw material storage tank are heated by the steam in the preheater and then enter a first-effect separator and the heater, meanwhile, the raw steam is started to preheat a two-three-effect feed liquid, after the preheating reaches a set temperature, a vapor compressor unit is started, secondary steam is extracted from the two-three-effect separator, and the pressure and the temperature of the secondary steam are increased by using a Roots type vapor compressor and then are conveyed to a two-three-effect heat exchanger to heat the feed liquid.
The temperature and pressure of the secondary steam are improved by compressing the steam generated by the heat recovery system by a steam compressor to apply work and converting electric energy into heat energy. And a vapor-liquid separator is arranged at the outlet of the separator, and the vapor-water separation of the residual moisture in the secondary steam is realized by the centrifugal action in the operation of the vapor-liquid separator.
Fig. 1 shows a specific structure of the device for reforming mechanical recompression evaporation by triple effect evaporation according to the utility model. As shown in fig. 1; the device for carrying out the mechanical recompression evaporation method by using the triple-effect evaporation comprises a heater 1, a separator 2 and a preheater 3, wherein the preheater 3 is fixedly connected with an effective heater 11, an effective separator 21 is connected with a pipeline 8, the three groups of heaters 1 and 2 are respectively connected with the pipeline 8 through a forced circulation pump 5, and a vapor compressor 4 and a communicating pipe 9 are assembled between the effective heater 11 and the double-effect heater 12 to realize the opposite connection.
Wherein the heater 1 comprises a one-effect heater 11, a two-effect heater 12, a three-effect heater 13, and wherein the separator 2 comprises a one-effect separator 21, a two-effect separator 22, and a three-effect separator 23. The first-effect separator 21, the second-effect separator 22 and the third-effect separator 23 are sequentially connected by the communicating pipe 9, and are provided with a liquid level sensor 10 at the interface for feeding back the liquid level, and a valve 7 for starting and stopping feeding is arranged on the communicating pipe 9 through bolts. And a concentrate pump 14 is installed at the bottom of the three-way separator 23, and the concentrate pump 14 conveys crystals generated by evaporation and concentration to a centrifuge for separation.
The vapor compressor 4 is a roots type vapor compressor, and the vapor compressor 4 compresses vapor generated by the first-effect separator 21, the second-effect separator 22 and the third-effect separator 23 to improve the pressure and the temperature of secondary vapor. The forced circulation pump 5 heats the feed liquid by forced circulation of the feed liquid in the two-effect evaporator and the recovered secondary steam, the heater 1 is arranged at the outlet of the forced circulation pump, the inlet is connected with the separator 2 through the communicating pipe 9, and no raw steam is used. And the water condensed in the preheater 3 and the heater 1 is conveyed to a water storage tank for recovery treatment by a condensate pump.
The principle explanation of the mechanical recompression evaporation transformation device is carried out by the three-effect evaporation;
the triple-effect evaporator consists of three groups of heaters 1, three groups of separators 2, a preheater 3, a forced circulation pump set 5, an electric instrument 6 control valve 7, a pipeline 8 and the like;
the three groups of evaporators are operated in series to form a three-effect evaporator. The whole set of evaporation system adopts a production mode of continuous feeding and continuous discharging. The solution to be evaporated firstly enters a one-effect forced circulation evaporator which is provided with a circulating pump, the solution is pumped into an evaporation heat exchange chamber, and the solution is heated by external vapor liquefaction to release the vaporization latent heat in the evaporation heat exchange chamber. Because the pressure in the evaporation heat exchange chamber is large, the solution is heated to overheat in the evaporation heat exchange chamber under the pressure higher than the boiling point of normal liquid, and after the heated liquid enters the evaporation separation chamber, the pressure of the solution is quickly reduced, so that part of the solution is flashed or quickly boiled. The vapor after the solution is evaporated enters a two-effect forced circulation evaporator as power vapor to heat the two-effect evaporator, and the non-evaporated solution temporarily exists in an evaporation chamber. The first-effect, second-effect and third-effect forced circulation evaporators are communicated through balance pipes, under the action of negative pressure, the solution flows from the first effect to the second effect and the third effect in sequence, the solution is continuously evaporated, the concentration of salt in the solution is higher and higher, when the salt in the solution exceeds a saturated state, the salt in the solution is continuously separated out and enters a salt collecting chamber at the lower part of the evaporation crystallization chamber. The salt absorption pump continuously sends the wastewater containing salt to the vortex salt separator, solid salt is separated in the vortex salt separator and enters the salt storage tank, the separated wastewater enters the two-effect forced circulation evaporator for heating, and the whole process is repeated to realize the final separation of water and salt.
The mechanical repressurization evaporation consists of a heater 1, a separator 2, a preheater 3, a vapor compressor 4, a forced circulation pump set 5, an electric instrument 6 control valve 7, a pipeline 8 and the like.
The mechanical repressurization evaporation working process is that a low-temperature steam compressor compresses and works secondary steam generated by material evaporation, the pressure and temperature of the secondary steam are increased, heat energy is converted from electric energy, the warmed secondary steam returns to an evaporation system to heat the material and then enters a heat exchanger to be condensed, so that the latent heat of the steam is fully utilized. The secondary steam compressed by the compressor is sent to the heating chamber of the evaporator to be used as heating steam, so that the feed liquid is kept in a boiling state, the heating steam is condensed into water, the heating steam is discharged out of the system, the heated material is vaporized and concentrated to be discharged out of the system as a final product, and in the whole mechanical repressurization evaporation system, the original steam to be abandoned has a utilization value, the latent heat is recovered, and the efficiency can be greatly improved by more than 50%. The most critical of the system is a steam compressor, which is a key device for the heat recovery system to increase the temperature and pressure of steam generated by compression, and the function is to pressurize and heat the low-pressure (or low-temperature) steam to meet the temperature and pressure requirements of the process or engineering.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The transformation device for mechanical recompression evaporation by three-effect evaporation comprises a heater (1), a separator (2) and a preheater (3), and is characterized in that; the preheater (3) is fixedly connected with the one-effect heater (11), the one-effect separator (21) is connected and fixed through a pipeline (8), the three groups of heaters (1) and the three groups of separators (2) are respectively connected with the pipeline (8) through a forced circulation pump (5), and a vapor compressor (4) is assembled between the one-effect heater (11) and the two-effect heater (12) to be connected with a communicating pipe (9) in a butt joint mode.
2. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 1 wherein: the heater (1) comprises an effective heater (11), a two-effective heater (12), a three-effective heater (13), and the separator (2) comprises an effective separator (21), a two-effective separator (22) and a three-effective separator (23).
3. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 2 wherein: the first-effect separator (21), the second-effect separator (22) and the third-effect separator (23) are sequentially connected by the communicating pipe (9), liquid level sensor (10) feedback liquid level is assembled at the joint, and valve (7) is assembled on the communicating pipe (9) through bolts for starting, stopping and feeding.
4. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 2 wherein: and a concentrate pump (14) is arranged at the bottom of the three-effect separator (23), and the concentrate pump (14) conveys crystals generated by evaporation concentration to a centrifugal machine for separation.
5. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 1 wherein: the steam compressor (4) is a Roots type steam compressor, and the steam compressor (4) compresses steam generated by the first-effect separator (21), the second-effect separator (22) and the third-effect separator (23) to improve the pressure and the temperature of secondary steam.
6. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 1 wherein: the outlet of the forced circulation pump (5) is provided with a heater (1), and the inlet is connected with the separator (2) through a communicating pipe (9).
7. The retrofit installation for mechanical recompression vaporization for triple effect vaporization according to claim 1 wherein: the water condensed in the preheater (3) and the heater (1) is conveyed to a water storage tank for recovery treatment through a condensed water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321210033.XU CN219743926U (en) | 2023-05-18 | 2023-05-18 | Transformation device for mechanical recompression evaporation by triple-effect evaporation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321210033.XU CN219743926U (en) | 2023-05-18 | 2023-05-18 | Transformation device for mechanical recompression evaporation by triple-effect evaporation |
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| Publication Number | Publication Date |
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| CN219743926U true CN219743926U (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321210033.XU Active CN219743926U (en) | 2023-05-18 | 2023-05-18 | Transformation device for mechanical recompression evaporation by triple-effect evaporation |
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| Country | Link |
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| CN (1) | CN219743926U (en) |
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2023
- 2023-05-18 CN CN202321210033.XU patent/CN219743926U/en active Active
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