CN213387830U - Evaporation stock solution temperature raising system in Bayer process alumina production - Google Patents
Evaporation stock solution temperature raising system in Bayer process alumina production Download PDFInfo
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- CN213387830U CN213387830U CN202021939270.6U CN202021939270U CN213387830U CN 213387830 U CN213387830 U CN 213387830U CN 202021939270 U CN202021939270 U CN 202021939270U CN 213387830 U CN213387830 U CN 213387830U
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Abstract
The utility model relates to the field of Bayer process alumina production, in particular to an evaporation stock solution temperature raising system in Bayer process alumina production, which comprises a decomposition tank and an intermediate cooling plate type heat exchanger; the bottom of the decomposition tank is connected with an intermediate cooling slurry pump, the outlet of the intermediate cooling slurry pump is connected with the heat flow inlet of an intermediate cooling plate type heat exchanger, and the heat flow outlet of the intermediate cooling plate type heat exchanger is connected with the top of the decomposition tank; the cold flow inlet of the intermediate cooling plate type heat exchanger is connected with the evaporation stock solution tank and the circulating water return tank in parallel, and the cold flow outlet of the intermediate cooling plate type heat exchanger is connected with the evaporation station and the circulating water return tank in parallel; the temperature of the intermediate cooling primary slurry (58-60 ℃) and the temperature of the plate type mother liquor bypass mother liquor (46-50 ℃) exchange heat through the arrangement of an intermediate cooling plate type heat exchanger, and the temperature of the stock solution is increased.
Description
Technical Field
The utility model relates to a field in the Bayer process alumina production, more specifically relates to an evaporation stoste system of raising temperature in Bayer process alumina production.
Background
In the production of alumina, the temperature of the evaporation stock solution is increased, which is beneficial to improving the operation efficiency of the evaporator and reducing the consumption of new steam and the production cost. The common method for increasing the temperature of the evaporation stock solution is to heat exchange and increase the temperature of the evaporation stock solution with high-temperature water such as dissolution secondary water, evaporation primary water and the like, or heat exchange and increase the temperature of the evaporation stock solution with high-temperature dissolution slurry.
The prior art has the following defects: firstly, the heat exchange with high-temperature water can reduce the overall heat of the oxygen system and destroy the heat balance; and secondly, the traditional evaporation stock solution temperature raising method is limited by the temperature raising capability of floor area, flow limitation and the like.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides an evaporation stock solution temperature raising system in Bayer process alumina production
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
an evaporation stock solution temperature raising system in Bayer process alumina production comprises a decomposition tank and an intermediate cooling plate type heat exchanger; the bottom of the decomposition tank is connected with an intermediate cooling slurry pump, the outlet of the intermediate cooling slurry pump is connected with the heat flow inlet of an intermediate cooling plate type heat exchanger, and the heat flow outlet of the intermediate cooling plate type heat exchanger is connected with the top of the decomposition tank; the cold flow inlet of the intermediate cooling plate type heat exchanger is connected with the evaporation stock solution tank and the circulating water return tank in parallel, and the cold flow outlet of the intermediate cooling plate type heat exchanger is connected with the evaporation station and the circulating water return tank in parallel; the circulating water return pool is connected with a cold flow inlet and a cold flow outlet of the intermediate cooling plate type heat exchanger to form a loop, a circulating water outlet gate valve is arranged on an inlet pipeline of the circulating water return pool, a circulating water inlet gate valve and a circulating water pump are arranged on an outlet pipeline of the circulating water return pool, and the circulating water pump is arranged between the circulating water inlet gate valve and the circulating water return pool; the outlet pipeline of the evaporation stock solution tank is provided with an evaporation stock solution inlet gate valve, and the inlet pipeline of the evaporation station is provided with an evaporation stock solution outlet gate valve.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
the utility model provides an evaporation stock solution temperature raising system in Bayer process alumina production, through middle cooling plate heat exchanger setting, with middle cooling primary slurry temperature (58-60 ℃) and the heat transfer of plate-type mother liquor bypass mother liquor (46-50 ℃), improve the stock solution temperature.
Drawings
FIG. 1 is a schematic diagram of an evaporation stock solution temperature raising system in Bayer process alumina production.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in figure 1, an evaporation stock solution temperature raising system in Bayer process alumina production is characterized in that: comprises a decomposition tank 1 and an intermediate cooling plate type heat exchanger 2; the bottom of the decomposition tank 1 is connected with an intermediate cooling slurry pump 3, the outlet of the intermediate cooling slurry pump 3 is connected with the heat flow inlet of an intermediate cooling plate type heat exchanger 2, and the heat flow outlet of the intermediate cooling plate type heat exchanger 2 is connected with the top of the decomposition tank 1; a cold flow inlet of the intermediate cooling plate type heat exchanger 2 is connected with an evaporation stock solution tank 11 and a circulating water return tank 8 in parallel, and a cold flow outlet of the intermediate cooling plate type heat exchanger 2 is connected with an evaporation station 9 and the circulating water return tank 8 in parallel; the circulating water return pool 8 is connected with a cold flow inlet and a cold flow outlet of the intermediate cooling plate type heat exchanger 2 to form a loop, an inlet pipeline of the circulating water return pool 8 is provided with a circulating water outlet gate valve 7, an outlet pipeline of the circulating water return pool 8 is provided with a circulating water inlet gate valve 6 and a circulating water pump 10, and the circulating water pump 10 is arranged between the circulating water inlet gate valve 6 and the circulating water return pool 8; an outlet pipeline of the evaporation stock solution tank 11 is provided with an evaporation stock solution inlet gate valve 4, and an inlet pipeline of the evaporation station 9 is provided with an evaporation stock solution outlet gate valve 5.
The specific structure utilizes heat exchange bypass to evaporate stock solution (flow rate is 300 m)3At 48-50 deg.c, the first stage intermediate cooling and decomposing aluminum hydroxide slurry with flow rate of 600m3The temperature is 60-62 ℃, and only on the basis of the temperature reduction of circulating water of the original intermediate cooling plate heat exchanger, the flow switching is realized by additionally utilizing the plugboard, so that the decomposition aluminum hydroxide slurry is cooled by the evaporation stock solution, and the aim of improving the temperature of the evaporation stock solution is fulfilled.
When the aluminum oxide is produced in winter, the middle cooling plate type heat exchanger can be left unused. After the flow switching is carried out by the inserting plate, the heat of the aluminum hydroxide slurry is absorbed and decomposed, and the purpose of increasing the temperature of the evaporation stock solution is achieved. According to thermodynamic calculation, the overall temperature of the evaporation stock solution can be raised by 2 ℃, the unit consumption of low-pressure steam is saved, and meanwhile, the temperature of the cooling decomposition tank is lowered by about 1.5 ℃, so that the effect of not influencing a decomposition cooling system is achieved.
The specific operation of the process switching is as follows: the bottom of the decomposition tank 1 is connected with an intermediate cooling slurry pump 3, the outlet of the intermediate cooling slurry pump 3 is connected with the heat flow inlet of an intermediate cooling plate type heat exchanger 2, and the heat flow outlet of the intermediate cooling plate type heat exchanger 2 is connected with the top of the decomposition tank 1; and (3) beating the mother liquor of the evaporation stock solution tank 11 to a cold flow inlet of the intermediate cooling plate heat exchanger 2, closing the circulating water inlet gate valve 6 at the moment, opening the decomposition tank slurry by the evaporation stock solution inlet gate valve 4 to exchange heat with the mother liquor, and then delivering the heated mother liquor to the evaporation station 10 through a cold flow outlet of the intermediate cooling plate heat exchanger 2. At the moment, the circulating water outlet gate valve 7 is closed, and the evaporation stock solution outlet gate valve 5 is opened
The utility model provides an evaporation stock solution temperature raising system is used for Bayer process alumina production, utilizes middle cooling primary slurry temperature (58-60 ℃) and the heat transfer of plate-type mother liquor bypass mother liquor (46-50 ℃), improves the stock solution temperature.
The above description has been made in detail only for the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art, and all such changes are intended to be encompassed by the present invention.
Claims (1)
1. An evaporation stock solution temperature raising system in Bayer process alumina production is characterized in that: comprises a decomposition tank (1) and an intermediate cooling plate type heat exchanger (2); the bottom of the decomposition tank (1) is connected with a middle cooling slurry pump (3), the outlet of the middle cooling slurry pump (3) is connected with a heat flow inlet of a middle cooling plate type heat exchanger (2), and the heat flow outlet of the middle cooling plate type heat exchanger (2) is connected with the top of the decomposition tank (1); the cold flow inlet of the intermediate cooling plate type heat exchanger (2) is connected with an evaporation stock solution tank (11) and a circulating water return tank (8) in parallel, and the cold flow outlet of the intermediate cooling plate type heat exchanger (2) is connected with an evaporation station (9) and the circulating water return tank (8) in parallel; the circulating water return tank (8) is connected with a cold flow inlet and a cold flow outlet of the intermediate cooling plate type heat exchanger (2) to form a loop, an inlet pipeline of the circulating water return tank (8) is provided with a circulating water outlet gate valve (7), an outlet pipeline of the circulating water return tank (8) is provided with a circulating water inlet gate valve (6) and a circulating water pump (10), and the circulating water pump (10) is arranged between the circulating water inlet gate valve (6) and the circulating water return tank (8); an outlet pipeline of the evaporation stock solution tank (11) is provided with an evaporation stock solution inlet gate valve (4), and an inlet pipeline of the evaporation station (9) is provided with an evaporation stock solution outlet gate valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021939270.6U CN213387830U (en) | 2020-09-08 | 2020-09-08 | Evaporation stock solution temperature raising system in Bayer process alumina production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021939270.6U CN213387830U (en) | 2020-09-08 | 2020-09-08 | Evaporation stock solution temperature raising system in Bayer process alumina production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213387830U true CN213387830U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021939270.6U Expired - Fee Related CN213387830U (en) | 2020-09-08 | 2020-09-08 | Evaporation stock solution temperature raising system in Bayer process alumina production |
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| CN (1) | CN213387830U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112125323A (en) * | 2020-09-08 | 2020-12-25 | 山西复晟铝业有限公司 | Evaporation stock solution temperature raising system in Bayer process alumina production |
-
2020
- 2020-09-08 CN CN202021939270.6U patent/CN213387830U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112125323A (en) * | 2020-09-08 | 2020-12-25 | 山西复晟铝业有限公司 | Evaporation stock solution temperature raising system in Bayer process alumina production |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210608 |
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| CF01 | Termination of patent right due to non-payment of annual fee |