CN211012574U - Red mud filtrate system of raising temperature - Google Patents
Red mud filtrate system of raising temperature Download PDFInfo
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- CN211012574U CN211012574U CN201921283589.5U CN201921283589U CN211012574U CN 211012574 U CN211012574 U CN 211012574U CN 201921283589 U CN201921283589 U CN 201921283589U CN 211012574 U CN211012574 U CN 211012574U
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Abstract
The utility model relates to a red mud filtrating system of raising temperature, it includes multistage self evaporator of establishing ties mutually and passes through the dilution tank of dissolving out the pipe connection with last one-level self evaporator's discharge gate, its characterized in that: the leaching device is characterized in that a first valve is additionally arranged on the leaching pipeline, a feeding end and a discharging end of the first valve are respectively communicated with a first pipeline and a second pipeline through a tee joint, the first pipeline is connected with a tube side inlet of the double-tube heat exchanger, the second pipeline is connected with a tube side outlet of the double-tube heat exchanger, a shell side inlet of the double-tube heat exchanger is connected with a red mud filtrate tank, and a shell side outlet of the double-tube heat exchanger is connected with a final-washing settling tank. The utility model discloses utilize the flash distillation ejection of compact that double-pipe heat exchanger will dissolve out in the process to be used for heating red mud filtrating, improve the temperature that red mud filtrating got into the end and washes the subsider, do benefit to the stable operation of subsider, also improved heat utilization rate, reduced the pan feeding temperature that gets into the dilution tank simultaneously, reduced the production volume of exhaust steam.
Description
Technical Field
The utility model relates to an aluminium oxide production technical field especially relates to a red mud filtrating system of raising temperature.
Background
In the production process of the aluminum oxide, the temperature of a stripping flash evaporation discharge material in a stripping process is 135-140 ℃, the stripping flash evaporation discharge material enters a dilution tank and is mixed with primary washing liquor to form exhaust steam at a flash evaporation position, the exhaust steam flashed at present is collected, one part of the exhaust steam is used for exchanging heat with red mud filtrate in a heat exchanger, the other part of the exhaust steam is used for directly exchanging heat with washing water in a water cooler, and the mode has the advantages of low heat utilization rate and large heat loss.
SUMMERY OF THE UTILITY MODEL
To the deficiency of the prior art, the utility model provides a red mud filtrating temperature raising system with high thermal utilization rate of stripping flash discharge.
The utility model provides a technical scheme that its technical problem adopted is: the red mud filtrate temperature raising system comprises a self-evaporator connected in series in a multi-stage manner and a dilution tank connected with a discharge hole of the last stage of self-evaporator through a digestion pipeline, and is characterized in that: the leaching device is characterized in that a first valve is additionally arranged on the leaching pipeline, a feeding end and a discharging end of the first valve are respectively communicated with a first pipeline and a second pipeline through a tee joint, the first pipeline is connected with a tube side inlet of the double-tube heat exchanger, the second pipeline is connected with a tube side outlet of the double-tube heat exchanger, a shell side inlet of the double-tube heat exchanger is connected with a red mud filtrate tank, and a shell side outlet of the double-tube heat exchanger is connected with a final-washing settling tank.
In the preferred embodiment of the red mud filtrate temperature raising system provided by the utility model, the double-pipe heat exchanger adopts four double-pipe heat exchangers.
In a preferred embodiment of the red mud filtrate temperature raising system provided by the utility model, a third valve and a fourth valve are respectively arranged on the first pipeline and the second pipeline.
Compared with the prior art, the utility model provides a red mud filtrating system of raising temperature's beneficial effect is: the utility model discloses utilize the flash distillation ejection of compact that double-pipe heat exchanger will dissolve out in the process to be used for heating red mud filtrating, improve the temperature that red mud filtrating got into the end and washes the subsider, do benefit to the stable operation of subsider, reduced the pan feeding temperature that gets into the dilution tank simultaneously, reduced the production volume of exhaust steam, also improved heat utilization rate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
FIG. 1 is a schematic structural diagram of a red mud filtrate temperature raising system provided by the utility model;
fig. 2 is a cross-sectional view of the double pipe heat exchanger of the red mud filtrate temperature raising system provided in fig. 1.
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 efforts belong to the protection scope of the present invention.
Referring to fig. 1, the red mud filtrate temperature raising system 1 includes a multistage self-evaporator 11 connected in series and a dilution tank 12 connected to a discharge port of the last stage self-evaporator 11 through a digestion pipe 13, and is characterized in that: a first valve 14 is additionally arranged on the digestion pipeline 13, a feed end and a discharge end of the first valve 14 are respectively communicated with a first pipeline 15 and a second pipeline 16 through a tee joint (not shown in the figure), the first pipeline 15 is connected with a tube side inlet of a double-pipe heat exchanger 17, the second pipeline 16 is connected with a tube side outlet of the double-pipe heat exchanger 17, a shell side inlet of the double-pipe heat exchanger 17 is connected with a red mud filtrate tank 18, and a shell side outlet of the double-pipe heat exchanger 17 is connected with a final-washing settling tank 19.
The dissolution process in the alumina production process comprises the following steps: the dissolved slurry is flashed by ten or eleven stages (from an evaporator 11) and the temperature is reduced to 130 +/-5 ℃ from 260 ℃, then enters a dilution tank 12, is diluted (primary washing water) with red mud washing liquor sent by the red mud sedimentation, and the diluted slurry is pumped to a dissolved tank 20;
in the settling step: the red mud filtrate obtained after filter pressing of the plate-and-frame filter press enters a red mud filtrate tank 18, the filtrate has low temperature, and the filtrate cannot be directly returned to a final washing sedimentation tank 19, and the temperature rise operation is required.
In this embodiment, the first valve 14 on the digestion pipeline 13 is closed, so that the slurry enters the double-pipe heat exchanger 17 to raise the temperature of the red mud filtrate to 90 ± 2 ℃, the red mud filtrate after the temperature raising has little influence on the settling tank, which is beneficial to the stability of the settling tank, and meanwhile, the slurry can be cooled, so that the temperature of the slurry entering the dilution tank 12 is reduced to 120-125 ℃, the generation amount of dead steam is reduced, and the heat energy utilization rate is improved.
Specifically, referring to fig. 1 and fig. 2, the double-pipe heat exchanger 17 in the present embodiment adopts a four-pipe heat exchanger, that is: the device comprises a shell 171 and 4 sleeves 172 arranged in the shell 171, wherein the 4 sleeves 172 are communicated to form a structure with an inlet at one end and an outlet at the other end to form a tube side, and a shell side is arranged between the shell 171 and the sleeves 172.
In this embodiment, further, a third valve 21 and a fourth valve 22 are respectively disposed on the first pipeline 15 and the second pipeline 16, and the third valve 21 and the fourth valve 22 are disposed to facilitate system maintenance.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (3)
1. The red mud filtrate temperature raising system comprises a self-evaporator connected in series in a multi-stage manner and a dilution tank connected with a discharge port of the last stage self-evaporator through a digestion pipeline, and is characterized in that: the leaching device is characterized in that a first valve is additionally arranged on the leaching pipeline, a feeding end and a discharging end of the first valve are respectively communicated with a first pipeline and a second pipeline through a tee joint, the first pipeline is connected with a tube side inlet of the double-tube heat exchanger, the second pipeline is connected with a tube side outlet of the double-tube heat exchanger, a shell side inlet of the double-tube heat exchanger is connected with a red mud filtrate tank, and a shell side outlet of the double-tube heat exchanger is connected with a final-washing settling tank.
2. The red mud filtrate temperature raising system according to claim 1, characterized in that: the double-pipe heat exchanger adopts a four-pipe heat exchanger.
3. The red mud filtrate temperature raising system according to claim 1, characterized in that: and a third valve and a fourth valve are respectively arranged on the first pipeline and the second pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921283589.5U CN211012574U (en) | 2019-08-08 | 2019-08-08 | Red mud filtrate system of raising temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921283589.5U CN211012574U (en) | 2019-08-08 | 2019-08-08 | Red mud filtrate system of raising temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211012574U true CN211012574U (en) | 2020-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921283589.5U Active CN211012574U (en) | 2019-08-08 | 2019-08-08 | Red mud filtrate system of raising temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211012574U (en) |
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2019
- 2019-08-08 CN CN201921283589.5U patent/CN211012574U/en active Active
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