CN213285684U - Evaporator group that split type, integral type of sodium aluminate solution combine - Google Patents
Evaporator group that split type, integral type of sodium aluminate solution combine Download PDFInfo
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- CN213285684U CN213285684U CN202021681242.9U CN202021681242U CN213285684U CN 213285684 U CN213285684 U CN 213285684U CN 202021681242 U CN202021681242 U CN 202021681242U CN 213285684 U CN213285684 U CN 213285684U
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- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 64
- 238000001704 evaporation Methods 0.000 claims abstract description 26
- 230000008020 evaporation Effects 0.000 claims abstract description 25
- 239000011550 stock solution Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 44
- 238000000926 separation method Methods 0.000 claims description 26
- 239000011552 falling film Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000007701 flash-distillation Methods 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 14
- 238000009835 boiling Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model relates to an evaporator group that split type, integral type of sodium aluminate solution combined belongs to evaporimeter technical field. The system comprises a plurality of split evaporators and a plurality of integrated evaporators, wherein the split evaporators are sequentially connected, the integrated evaporators are sequentially connected, the last split evaporator is connected with the first integrated evaporator, evaporation stock solution enters from the last integrated evaporator and then sequentially flows to the first split evaporator, and evaporation concentration is performed on discharged solution step by step; still include a plurality of self evaporator, it is a plurality of the self evaporator connects gradually, and the head split type evaporator is connected with the first self evaporator, flows into first self evaporator by the ejection of compact solution that first split type evaporator flows out, flows to end position self evaporator in proper order again, the self evaporator carries out the flash distillation cooling to ejection of compact solution in proper order. The steam boiler is compact in structure, small in occupied area and heat loss, and capable of reducing steam consumption and production cost.
Description
Technical Field
The utility model relates to an evaporator group that split type, integral type of sodium aluminate solution combined belongs to evaporimeter technical field.
Background
The evaporator is one of the important equipments in the production process of alumina, and its task is to evaporate and concentrate the circulating mother liquor in the production process of alumina, and raise the concentration of its effective component caustic alkali, so that it can be returned to raw material process to treat next batch of bauxite which is fed into production process.
At present, the seven-effect falling-film evaporator used for evaporating the mother liquor in the production of the aluminum oxide has the obvious characteristics of high efficiency, energy conservation and consumption reduction, meets the policy requirements of high and new technical fields supported by national emphasis, and has obvious advantages in the aspect of high-efficiency utilization of energy; however, the steam consumption and the alkali content of secondary steam condensate of a fully-split seven-effect falling-film evaporator which is applied to some enterprises at present are still relatively high, taking a certain 400 ton/h fully-split seven-effect falling-film evaporator which is operated at present as an example, when sodium aluminate solution of an alumina plant is adopted for evaporation and concentration, the raw liquid feeding flow is about 1000-1200 m3/h, the actual evaporation capacity is 350-370 ton/h, the evaporation steam-water ratio is not less than 0.2 ton of steam/ton of water, and the alkali content of the secondary steam condensate is not less than 30 mg/l. The high steam-water ratio of evaporation can directly increase the production cost, and the high alkali content of the secondary steam condensate water can increase the production water treatment cost and the alkali loss of the mother liquor.
Although the full-split seven-effect falling-film evaporator has operated in seven effects, the steam consumption index and the alkali-containing index of condensed water are not ideal enough, and the main reason is that the basic structure of the evaporator adopts the full-split type. The heating chamber and the separating chamber of the split falling-film evaporator are separated and connected by a communicating pipe, and the lower part of the split heating chamber is also provided with a liquid collecting chamber, so that the floor area is large, and the capital investment is large; and the split falling-film evaporator has dispersed structure, so that the relative heat loss is large and the steam consumption is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an evaporator group that split type, integral type of sodium aluminate solution combined is provided to above-mentioned prior art, compact structure not only reduces area for a short time, and the heat loss is little moreover, reduces steam consumption, reduction in production cost.
The utility model provides a technical scheme that above-mentioned problem adopted does: a split type and integrated evaporator group for sodium aluminate solution comprises a plurality of split type evaporators and a plurality of integrated type evaporators, wherein the split type evaporators are sequentially connected, the integrated type evaporators are sequentially connected, the last split type evaporator is connected with the first integrated type evaporator, evaporation stock solution enters from the last integrated type evaporator and then sequentially flows to the first split type evaporator, and evaporation concentration is performed on discharged solution step by step; the system is characterized by further comprising a plurality of self-evaporators, wherein the self-evaporators are sequentially connected, the first split type evaporator is connected with the first self-evaporator, a discharged material solution flowing out of the first split type evaporator flows into the first self-evaporator and then sequentially flows to the last self-evaporator, and the self-evaporators sequentially carry out flash evaporation cooling on the discharged material solution to form a concentrated solution and then discharge the concentrated solution;
the steam inlet of the heating chamber of the split-type evaporator is communicated with a new steam pipeline, the secondary steam outlet of the separation chamber of the split-type evaporator is communicated with the steam inlet of the heating chamber of the rear split-type evaporator, the secondary steam outlet of the separation chamber of the split-type evaporator is communicated with the steam inlet of the heating chamber of the first integrated evaporator, the secondary steam outlet of the separation chamber of the integrated evaporator is communicated with the steam inlet of the heating chamber of the rear integrated evaporator, and the secondary steam outlet of the separation chamber of the integrated evaporator is communicated with the water cooler.
The split-type evaporators comprise a first evaporator and a second evaporator, and the first evaporator and the second evaporator are respectively split-type falling-film evaporators; the plurality of integrated evaporators comprise a third evaporator to a seventh evaporator, and the third evaporator to the seventh evaporator are respectively integrated falling-film evaporators.
The plurality of self-evaporators include a first stage self-evaporator to a fifth stage self-evaporator.
The split falling-film evaporator comprises a heating chamber and a separation chamber arranged side by side with the heating chamber, wherein a liquid collection chamber is arranged at the bottom of the heating chamber and is communicated with the heating chamber through a connecting pipe.
Compared with the prior art, the utility model has the advantages of: the utility model provides an evaporator group that split type, integral type of sodium aluminate solution combined, adopt two split type falling film evaporators and five integral type falling film evaporators to establish ties and constitute, first evaporimeter, be the solution that temperature and alkali concentration are all very high relatively in the second evaporimeter, first evaporimeter, the second evaporimeter adopts split type back, will receive the heating chamber and the separation chamber separation of alkali corrosion most easily, make the collecting chamber and the separation chamber intercommunication in the heating chamber through the connecting pipe, the corrosion of high-temperature high alkali concentration solution has been avoided to the heating chamber substructure, the safe operation and the life of first evaporimeter and second evaporimeter have effectively been guaranteed. The third evaporator to the seventh evaporator adopt an integrated structure, and because the temperature and the concentration of the solution in the third evaporator to the seventh evaporator are lower, the solution cannot corrode the lower structure of the heating chamber; and the integrated falling-film evaporator has compact structure, small heat loss and high heat efficiency, reduces the steam consumption and reduces the production cost.
Drawings
Fig. 1 is a schematic diagram of a split-type and integrated evaporator set for sodium aluminate solution according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a split falling film evaporator;
FIG. 3 is a schematic of an integrated falling film evaporator;
in the figure, 1, a first evaporator, 2, a second evaporator, 3, a third evaporator, 4, a fourth evaporator, 5, a fifth evaporator, 6, a sixth evaporator, 7, a seventh evaporator, 8 water coolers, 9, a first-stage self-evaporator, 10, a second-stage self-evaporator, 11, a third-stage self-evaporator, 12, a fourth-stage self-evaporator, 13, a fifth-stage self-evaporator, 14 a concentrated liquid pump, 15 a heating chamber steam inlet, 16 a separating chamber secondary steam outlet, 17 a heating chamber, 18 connecting pipes and 19 separating chambers.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, 2 and 3, the split-type and integrated-type evaporator set for sodium aluminate solution in the present embodiment includes a first evaporator 1 to a seventh evaporator 7, wherein the first evaporator 1 and the second evaporator 2 are respectively split-type falling-film evaporators, and the third evaporator 3 to the seventh evaporator 7 are respectively integrated-type falling-film evaporators. The seventh evaporator 7, the sixth evaporator 6, the fifth evaporator 5, the fourth evaporator 4, the third evaporator 3, the second evaporator 2 and the first evaporator 1 are sequentially connected, and evaporation stock solution is fed by the seventh evaporator 7 and is evaporated and concentrated step by step through the seventh evaporator 7 to the first evaporator 1. The first evaporator 1 is sequentially connected with a first stage self-evaporator 9, a second stage self-evaporator 10, a third stage self-evaporator 11, a fourth stage self-evaporator 12 and a fifth stage self-evaporator 13, and the discharged solution flowing out of the first evaporator 1 is subjected to flash evaporation cooling through the first stage self-evaporator 9 to the fifth stage self-evaporator 13 in sequence to form concentrated solution and is discharged out of an evaporation station.
The heating chamber steam inlet 15 of the first evaporator 1 is communicated with a new steam pipeline, the separating chamber secondary steam outlet 16 of the former evaporator is communicated with the heating chamber steam inlet 15 of the latter evaporator, and the separating chamber secondary steam outlet 16 of the seventh evaporator 7 is communicated with the water cooler 8.
As shown in figure 2, the split falling-film evaporator comprises a heating chamber 17 and a separation chamber 19 which is arranged side by side with the heating chamber 17, wherein a liquid collecting chamber is arranged in the heating chamber 17 and is communicated with the separation chamber 19 through a connecting pipe 18
And the low-concentration evaporation stock solution to be evaporated and concentrated enters from an inlet of a separation chamber of the seventh evaporator 7, the evaporation stock solution is conveyed to the top of the seventh evaporator 7 by a circulating pump and enters a heating chamber of the seventh evaporator 7, the evaporation stock solution is heated to a boiling point by steam in the heating chamber and then enters the separation chamber to be boiled violently for evaporation and concentration to form a discharge solution, and the discharge solution flows out from a solution outlet at the bottom of the separation chamber, flows to the sixth evaporator 6 by the circulating pump and enters from an inlet of the separation chamber of the sixth evaporator 6. Heating steam of 150-158 ℃ under 0.5-0.6 Mpa enters from a heating steam inlet of the first evaporator 1, the solution in the first evaporator 1 enters a separation chamber after being heated to a boiling point, and the solution is violently boiled in the separation chamber of the first evaporator 1 to obtain evaporation concentration; the secondary steam generated by the secondary steam enters the second evaporator 2, so that the solution in the second evaporator 2 is heated to the boiling point, and the solution is violently boiled in a separation chamber of the second evaporator 2 to obtain evaporation concentration; the secondary steam generated by the second evaporator 2 enters the third evaporator 3, so that the solution in the third evaporator 3 is heated to the boiling point, and the solution is violently boiled in a separation chamber of the third evaporator 3 to be evaporated and concentrated; the heating steam enters the heating chamber of the evaporator step by step to heat the solution and is boiled violently in the corresponding separation chamber to obtain evaporation concentration, the temperature of the secondary steam generated by the last evaporator is 50 ℃, and the secondary steam enters the water cooler 8 to be absorbed by circulating cooling water due to low temperature. Because the secondary steam generated by the first evaporator 1 can be recycled for six times, the energy-saving effect is very obvious, and the steam-water ratio of evaporation can reach 0.15-0.17 ton of steam/ton of water.
The temperature of the discharged solution of the first evaporator 1 is 140-146 ℃, the discharged solution enters the first-stage self-evaporator 9 by virtue of pressure difference, self-boiling is carried out in the first-stage self-evaporator 9 with lower temperature and pressure, the discharged solution is further concentrated, and the generated secondary steam enters a heating chamber of the third evaporator 3 to heat the solution of the third evaporator 3; the solution in the second stage self-evaporator 10 after self-boiling enters the third stage self-evaporator 11 with lower temperature and pressure to carry out self-boiling by means of pressure difference, the solution is concentrated again, and the generated secondary steam enters the heating chamber of the fourth evaporator 4 to heat the solution in the evaporator; similarly, by means of pressure difference, the solution in the third-stage self-evaporator 11 after self-boiling enters a fourth-stage self-evaporator 12 with lower temperature and lower pressure for self-boiling, the solution is concentrated again, and secondary steam generated by the solution enters a heating chamber of the fifth evaporator 5 to heat the solution in the fifth evaporator 5; in the same way, the solution in the fifth stage self-evaporator 13 is boiled, evaporated and concentrated, the generated secondary steam enters the heating chamber of the seventh evaporator 7 to heat the solution in the seventh evaporator, and the discharged solution from the fifth stage self-evaporator 13 is a concentrated solution obtained by multiple evaporation and concentration processes and is output by the concentrated solution pump 14.
This application adopts two split type falling film evaporators and five integral type falling film evaporators to establish ties and constitutes, because sodium aluminate solution is a strong alkaline solution, the evaporation concentration adopts the full adverse current mode, because the evaporimeter is carbon steel material system spare, be the solution that temperature and alkali concentration all are very high relatively in the first evaporimeter, the second evaporimeter, heating chamber substructure suffers high temperature, the corruption of high alkali concentration solution, cause "stress corrosion" easily, promptly, "alkali is fragile", can cause the damage to the evaporimeter in the short time, the life of first evaporimeter and second evaporimeter has been reduced. First evaporimeter, second evaporimeter adopt split type back, will receive the heating chamber and the separator separation of alkali corrosion most easily, and heating chamber substructure no longer suffers the corruption of high-temperature high alkali concentration solution, has effectively guaranteed the safe operation and the life of first evaporimeter and second evaporimeter. The third evaporator to the seventh evaporator adopt an integrated structure, namely, one part of the heating chamber is inserted into the separation chamber, and the temperature and the concentration of the solution in the third evaporator to the seventh evaporator are lower, so that the corrosion to the lower structure of the heating chamber is not enough; and the integrated falling-film evaporator has compact structure, small heat loss and high heat efficiency, reduces the steam consumption and reduces the production cost.
Therefore, the split type and integrated combined structure is adopted, the respective advantages of the two evaporator structures are properly and fully exerted, and the respective disadvantages of the two structures are avoided.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (4)
1. The utility model provides a split type, the evaporator assembly that the integral type of sodium aluminate solution combines which characterized in that: the system comprises a plurality of split evaporators and a plurality of integrated evaporators, wherein the split evaporators are sequentially connected, the integrated evaporators are sequentially connected, the last split evaporator is connected with the first integrated evaporator, evaporation stock solution enters from the last integrated evaporator and then sequentially flows to the first split evaporator, and evaporation concentration is performed on discharged solution step by step; the system is characterized by further comprising a plurality of self-evaporators, wherein the self-evaporators are sequentially connected, the first split type evaporator is connected with the first self-evaporator, a discharged material solution flowing out of the first split type evaporator flows into the first self-evaporator and then sequentially flows to the last self-evaporator, and the self-evaporators sequentially carry out flash evaporation cooling on the discharged material solution to form a concentrated solution and then discharge the concentrated solution;
the steam inlet of the heating chamber of the split-type evaporator is communicated with a new steam pipeline, the secondary steam outlet of the separation chamber of the split-type evaporator is communicated with the steam inlet of the heating chamber of the rear split-type evaporator, the secondary steam outlet of the separation chamber of the split-type evaporator is communicated with the steam inlet of the heating chamber of the first integrated evaporator, the secondary steam outlet of the separation chamber of the integrated evaporator is communicated with the steam inlet of the heating chamber of the rear integrated evaporator, and the secondary steam outlet of the separation chamber of the integrated evaporator is communicated with the water cooler.
2. The split-type and integrated evaporator set of sodium aluminate solution according to claim 1, characterized in that: the split-type evaporators comprise a first evaporator and a second evaporator, and the first evaporator and the second evaporator are respectively split-type falling-film evaporators; the plurality of integrated evaporators comprise a third evaporator to a seventh evaporator, and the third evaporator to the seventh evaporator are respectively integrated falling-film evaporators.
3. The split-type and integrated evaporator set of sodium aluminate solution according to claim 1, characterized in that: the plurality of self-evaporators include a first stage self-evaporator to a fifth stage self-evaporator.
4. The split-type and integrated evaporator set of sodium aluminate solution according to claim 2, characterized in that: the split falling-film evaporator comprises a heating chamber and a separation chamber arranged side by side with the heating chamber, wherein a liquid collection chamber is arranged at the bottom of the heating chamber and is communicated with the heating chamber through a connecting pipe.
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| CN202021681242.9U CN213285684U (en) | 2020-08-13 | 2020-08-13 | Evaporator group that split type, integral type of sodium aluminate solution combine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443642A (en) * | 2021-06-24 | 2021-09-28 | 贵阳铝镁设计研究院有限公司 | Concentration and cooling process of sodium aluminate solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443642A (en) * | 2021-06-24 | 2021-09-28 | 贵阳铝镁设计研究院有限公司 | Concentration and cooling process of sodium aluminate solution |
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