CN211920891U - Sulfuric acid process titanium white powder vacuum crystallization system - Google Patents
Sulfuric acid process titanium white powder vacuum crystallization system Download PDFInfo
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- CN211920891U CN211920891U CN201922319116.2U CN201922319116U CN211920891U CN 211920891 U CN211920891 U CN 211920891U CN 201922319116 U CN201922319116 U CN 201922319116U CN 211920891 U CN211920891 U CN 211920891U
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Abstract
The utility model discloses a can recycle the thermal sulfuric acid process titanium white powder vacuum crystallization system of steam that steam ejector brought out. The sulfuric acid process titanium dioxide vacuum crystallization system comprises a vacuum crystallizer, a steam ejector, a secondary steam ejector and a vacuum pump; the device also comprises a tubular heat exchanger, a second-stage tubular heat exchanger, a first-stage refined titanium liquid tank, a first-stage refined titanium liquid pump, a second-stage refined titanium liquid tank and a circulating pump. This sulfate process titanium white powder vacuum crystallization system usable filtration crystallization titanium liquid obtains the smart titanium liquid cools off as the coolant of tube nest heat exchanger and second grade tube nest heat exchanger, not only can the water economy resource, and the heat that can recycle steam ejector and second grade steam ejector brought out steam before the concentrated smart titanium liquid of heat moreover preheats smart titanium liquid in advance, has avoided a large amount of wastes of heat.
Description
Technical Field
The utility model relates to a sulfuric acid process titanium white powder production facility, especially a sulfuric acid process titanium white powder vacuum crystallization system.
Background
Vacuum crystallization refers to a process in which adiabatic evaporation of a solvent and cooling of a solution are simultaneously carried out under vacuum, so that the solution is supersaturated and crystallized. The excessive ferrous sulfate is removed before the hydrolysis of the titanium liquid produced by the sulfuric acid method titanium dioxide, and the treatment is carried out by adopting a vacuum crystallization mode, wherein the crystallization is generally completed in a sulfuric acid method titanium dioxide vacuum crystallization system.
As shown in fig. 1, the existing sulfuric acid method titanium dioxide vacuum crystallization system comprises a vacuum crystallizer 1, a steam ejector 2, a plate spray tower 3, a secondary steam ejector 4, a secondary plate spray tower 5 and a vacuum pump 6; the extraction opening of the vacuum crystallizer 1 is connected with the air suction opening of the steam ejector 2, the air inlet of the steam ejector 2 is connected with a saturated steam pipe, the air outlet is connected with the air inlet of the plate-type spray tower 3, the water inlet of the plate-type spray tower 3 is connected with a circulating water upper water pipe, the water outlet of the plate-type spray tower is connected with a circulating water return pipe, the air outlet of the plate-type spray tower 3 is connected with the air suction opening of the second-stage steam ejector 4, the air inlet of the second-stage steam ejector 4 is connected with the saturated steam pipe, the air outlet of the second-stage plate-type spray tower 5 is connected with the air inlet of the circulating water upper water pipe, the water outlet of the second.
In the crystallization process, the clear titanium liquid with the temperature of 55 ℃ is added into a vacuum crystallizer 1, the pressure of the vacuum crystallizer 1 is gradually reduced under the action of a steam ejector 2, the boiling point of the solution is reduced under vacuum, so that the titanium liquid is boiled and evaporated, the temperature of the titanium liquid is rapidly reduced by evaporation of water, the ferrous sulfate is supersaturated, and precipitated crystals are separated and removed; steam used by the steam ejector 2 and secondary steam evaporated by the solvent are cooled by the plate-type spray tower 3, then are sucked by the secondary steam ejector 4 and cooled by the secondary plate-type spray tower 5, finally the non-condensable gas is sucked and exhausted by the vacuum pump 6, and condensed water is discharged outside.
According to incomplete statistics, about 1.2 tons of 0.70MPa saturated steam and 200m saturated steam are used for each ton of products in the production process of titanium dioxide by a sulfuric acid method3And (5) circulating water. Because the existing sulfuric acid method titanium dioxide vacuum crystallization system uses secondary steam and jet steam brought out by a circulating water spray cooling steam ejector, heat is replaced in a plate type spray tower and enters into circulating water, and meanwhile, the circulating water is recycled after being naturally cooled; the heat of the secondary steam and the jet steam is not utilized, and a large amount of heat is wasted.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a thermal sulfuric acid process titanium white powder vacuum crystallization system that can recycle steam ejector bring steam out.
The utility model provides a technical scheme that its technical problem adopted is: the sulfuric acid process titanium dioxide vacuum crystallization system comprises a vacuum crystallizer, a steam ejector, a secondary steam ejector and a vacuum pump; the device also comprises a tube type heat exchanger, a secondary tube type heat exchanger, a primary refined titanium liquid tank, a primary refined titanium liquid pump, a secondary refined titanium liquid tank and a circulating pump; the extraction opening of the vacuum crystallizer is connected with an air suction port of the steam ejector, an air inlet of the steam ejector is connected with a saturated steam pipe, an air outlet of the steam ejector is connected with an air inlet of the tubular heat exchanger, a liquid inlet of the tubular heat exchanger is connected with a liquid outlet of a circulating pump through a circulating liquid feeding pipe, a liquid outlet of the tubular heat exchanger is connected with a liquid inlet of the first-stage refined titanium liquid tank through a circulating liquid returning pipe, an air outlet of the tubular heat exchanger is connected with an air suction port of the second-stage steam ejector, an air inlet of the second-stage steam ejector is connected with the saturated steam pipe, an air outlet of the second-stage steam ejector is connected with an air inlet of the second-stage tubular heat exchanger, a liquid inlet of the second-stage tubular heat exchanger is connected with a liquid outlet of the circulating pump through a circulating liquid feeding pipe, a liquid outlet of the first-stage refined The hot titanium liquid outlet of the primary refined titanium liquid tank is connected with a concentration device, the crystallized titanium liquid outlet of the vacuum crystallizer is connected with the liquid inlet of the secondary refined titanium liquid tank through a filtering device, and the liquid outlet of the secondary refined titanium liquid tank is connected with the liquid inlet of a circulating pump.
Further, the tube array heat exchanger comprises a shell, a first ring tube arranged in the shell, a second ring tube nested in the first ring tube, and a plurality of heat exchange tubes uniformly distributed in an annular cavity of the first ring tube and in an annular cavity of the second ring tube; a heat exchange space is formed between the second ring pipe and the first ring pipe, and both the air inlet and the air outlet of the tubular heat exchanger are communicated with the heat exchange space; the liquid inlet of the tubular heat exchanger is connected with the liquid inlet of each heat exchange tube through a titanium liquid inlet connecting tube, and the liquid outlet of the tubular heat exchanger is connected with the liquid outlet of each heat exchange tube through a titanium liquid outlet connecting tube.
Further, the structure of the secondary tube-in-tube heat exchanger is the same as that of the tube-in-tube heat exchanger.
Further, the filtration equipment comprises a plate-and-frame filter press and a vacuum disc filter, wherein a liquid inlet of the vacuum disc filter is connected with a crystallized titanium liquid outlet of the vacuum crystallizer, a liquid outlet of the vacuum disc filter is connected with a liquid inlet of the plate-and-frame filter press, and a liquid outlet of the plate-and-frame filter press is connected with a liquid inlet of the secondary refined titanium liquid tank.
Further, gas-liquid separators are arranged on the connection between the gas outlet of the tube heat exchanger and the gas suction port of the secondary steam ejector and the connection between the gas outlet of the secondary tube heat exchanger and the vacuum pump.
The utility model has the advantages that: the shell and tube heat exchanger and the secondary shell and tube heat exchanger are respectively arranged to exchange heat with the steam brought out by the steam ejector and the secondary steam ejector, so that direct contact between a cooling medium and the steam brought out by the steam ejector and the secondary steam ejector can be avoided; meanwhile, a secondary refined titanium liquid tank connected with a crystallized titanium liquid outlet of the vacuum crystallizer through a filtering device is arranged, and a liquid outlet of the secondary refined titanium liquid tank is connected with a circulating liquid feeding pipe through a circulating pump, so that the refined titanium liquid obtained through filtering can be used as a cooling medium of a tubular heat exchanger and a secondary tubular heat exchanger for cooling, the refined titanium liquid after heat exchange can flow into the primary refined titanium liquid tank through a circulating liquid return pipe, most of the refined titanium liquid flowing into the primary refined titanium liquid tank enters a concentrating device through a hot titanium liquid outlet for carrying out a refined titanium liquid heat concentrating process, wherein a small part of the refined titanium liquid is pumped into the secondary refined titanium liquid tank through a primary refined titanium liquid pump to be mixed with the refined titanium liquid obtained through filtering to continue to serve as the cooling medium, and the circulation is carried out; whole process, owing to adopt that the refined titanium liquid carries out the refrigerated as coolant, not only can the water economy resource, moreover can recycle the heat of steam ejector and the steam that the second grade steam ejector brought out before the concentrated refined titanium liquid of heat preheats the refined titanium liquid in advance, avoided the heat waste in a large number.
Drawings
FIG. 1 is a schematic diagram of an implementation structure of a current sulfuric acid process titanium dioxide vacuum crystallization system;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a tube and tube heat exchanger;
labeled as: the device comprises a vacuum crystallizer 1, a steam ejector 2, a plate spray tower 3, a tube type heat exchanger 3 ', a secondary steam ejector 4, a secondary plate spray tower 5, a secondary tube type heat exchanger 5', a vacuum pump 6, a primary refined titanium liquid tank 7, a primary refined titanium liquid pump 8, a secondary refined titanium liquid tank 9, a circulating pump 10, a plate and frame filter press 11, a vacuum disc filter 12, a gas-liquid separator 13, a shell 31, a first ring pipe 32, a second ring pipe 33, a heat exchange pipe 34 and a titanium liquid inlet connecting pipe 35.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 2, the sulfuric acid method titanium dioxide vacuum crystallization system comprises a vacuum crystallizer 1, a steam ejector 2, a secondary steam ejector 4 and a vacuum pump 6; the device also comprises a tubular heat exchanger 3 ', a secondary tubular heat exchanger 5', a primary refined titanium liquid tank 7, a primary refined titanium liquid pump 8, a secondary refined titanium liquid tank 9 and a circulating pump 10; the extraction opening of the vacuum crystallizer 1 is connected with the air suction opening of a steam ejector 2, the air inlet of the steam ejector 2 is connected with a saturated steam pipe, the air outlet of the steam ejector 2 is connected with the air inlet of a tubular heat exchanger 3 ', the liquid inlet of the tubular heat exchanger 3' is connected with the liquid outlet of a circulating pump 10 through a circulating feeding pipe, the liquid outlet of the tubular heat exchanger is connected with the liquid inlet of a first-stage refined titanium liquid tank 7 through a circulating return pipe, the air outlet of the tubular heat exchanger 3 'is connected with the air suction opening of a second-stage steam ejector 4, the air inlet of the second-stage steam ejector 4 is connected with the saturated steam pipe, the air outlet of the second-stage tubular heat exchanger 5' is connected with the air inlet of the second-stage tubular heat exchanger 5 ', the liquid inlet of the second-stage tubular heat exchanger 5' is connected with the liquid outlet of the circulating pump 10 through the circulating feeding pipe, the, the circulation liquid outlet of one-level refined titanium liquid groove 7 is connected with the inlet of second grade refined titanium liquid groove 9 through one-level refined titanium liquid pump 8, the hot titanium liquid export of one-level refined titanium liquid groove 7 is connected with concentrator, the crystallization titanium liquid export of vacuum crystallizer 1 is connected with the inlet of second grade refined titanium liquid groove 9 through filtration equipment, the liquid outlet of second grade refined titanium liquid groove 9 is connected with the inlet of circulating pump 10.
The circulating heat exchange process of the sulfuric acid method titanium dioxide vacuum crystallization system is as follows: conveying the clear titanium liquid from the previous process into a vacuum crystallizer 1 for ferrous sulfate crystallization, obtaining cold-state crystallized titanium liquid at about 20 ℃ after crystallization, filtering the cold-state crystallized titanium liquid by a filter device to obtain refined titanium liquid, feeding the refined titanium liquid into a secondary refined titanium liquid tank 9, respectively conveying the refined titanium liquid to a tube array heat exchanger 3 'and a secondary tube array heat exchanger 5' by a circulating pump 10 to be used as cooling media, performing heat exchange by using secondary steam and jet steam respectively carried out by a steam ejector 2 and a secondary steam ejector 4, and heating the refined titanium liquid by using the steam to realize the recycling of waste heat; and the refined titanium liquid after heat exchange flows into a primary refined titanium liquid tank 7 through a circulating liquid return pipe, wherein the hot refined titanium liquid of about 2/3 is conveyed into a concentration device to carry out a refined titanium liquid thermal concentration process, and the rest hot refined titanium liquid is conveyed into a secondary refined titanium liquid tank 9 by a primary refined titanium liquid pump 8 to be mixed with the refined titanium liquid obtained by filtering to continue to serve as a cooling medium, and the circulation is carried out.
Wherein, the heat exchange is carried out by the tube heat exchanger 3 'and the secondary tube heat exchanger 5', which can avoid the direct contact of the cooling medium with the steam brought by the steam ejector 2 and the secondary steam ejector 4 and prevent the pollution of the cooling medium. The structure of the secondary tube heat exchanger 5 'is generally the same as that of the tube heat exchanger 3'.
Specifically, as shown in fig. 2 and 3, the tube array heat exchanger 3' includes a housing 31, a first loop tube 32 disposed in the housing 31, a second loop tube 33 nested in the first loop tube 32, and a plurality of heat exchange tubes 34 uniformly disposed in an annular cavity of the first loop tube 32 and an annular cavity of the second loop tube 33; a heat exchange space is formed between the second ring pipe 33 and the first ring pipe 32, and both the air inlet and the air outlet of the tubular heat exchanger 3' are communicated with the heat exchange space; a liquid inlet of the tubular heat exchanger 3 'is connected with a liquid inlet of each heat exchange tube 34 through a titanium liquid inlet connecting tube 35, and a liquid outlet of the tubular heat exchanger 3' is connected with a liquid outlet of each heat exchange tube 34 through a titanium liquid outlet connecting tube. At least 10 heat exchange tubes 34 are generally arranged in the annular cavity of the second loop pipe 33, and the plurality of heat exchange tubes 34 arranged in the annular cavity of the second loop pipe 33 are generally distributed in an annular array; more heat exchange tubes 34 are disposed within the annular cavity of the first collar 32 than are disposed within the annular cavity of the second collar 33, and the plurality of heat exchange tubes 34 disposed within the annular cavity of the first collar 32 are generally arranged in an annular array.
Preferably, as shown in fig. 2, the filtering equipment includes a plate-and-frame filter press 11 and a vacuum disc filter 12, a liquid inlet of the vacuum disc filter 12 is connected to a crystallized titanium liquid outlet of the vacuum crystallizer 1, a liquid outlet of the vacuum disc filter 12 is connected to a liquid inlet of the plate-and-frame filter press 11, and a liquid outlet of the plate-and-frame filter press 11 is connected to a liquid inlet of the secondary refined titanium liquid tank 9. During filtering, the crystallized cold-state crystallized titanium liquid is firstly subjected to ferrous separation through a vacuum disc filter 12, and the titanium liquid after the sulfurous acid sulfite separation is subjected to controlled filtering through a plate-and-frame filter press 11 to obtain refined titanium liquid.
As a preferable embodiment of the present invention, as shown in fig. 2, a gas-liquid separator 13 is disposed on the connection between the gas outlet of the tubular heat exchanger 3 'and the suction port of the second-stage steam ejector 4, and on the connection between the gas outlet of the second-stage tubular heat exchanger 5' and the vacuum pump 6. By providing the gas-liquid separator 13, the cooled steam can be subjected to gas-liquid separation, condensed water can be removed in advance, and the discharge pressure of the vacuum pump 6 can be reduced.
Claims (5)
1. The sulfuric acid process titanium dioxide vacuum crystallization system comprises a vacuum crystallizer (1), a steam ejector (2), a secondary steam ejector (4) and a vacuum pump (6); the method is characterized in that: the device also comprises a tubular heat exchanger (3 '), a secondary tubular heat exchanger (5'), a primary refined titanium liquid tank (7), a primary refined titanium liquid pump (8), a secondary refined titanium liquid tank (9) and a circulating pump (10); the extraction opening of the vacuum crystallizer (1) is connected with the air suction opening of a steam ejector (2), the air inlet of the steam ejector (2) is connected with a saturated steam pipe, the air outlet of the steam ejector is connected with the air inlet of a tubular heat exchanger (3 '), the liquid inlet of the tubular heat exchanger (3') is connected with the liquid outlet of a circulating pump (10) through a circulating liquid feeding pipe, the liquid outlet of the tubular heat exchanger is connected with the liquid inlet of a first-stage refined titanium liquid tank (7) through a circulating liquid returning pipe, the air outlet of the tubular heat exchanger (3 ') is connected with the air suction opening of a second-stage steam ejector (4), the air inlet of the second-stage steam ejector (4) is connected with the saturated steam pipe, the air outlet of the second-stage tubular heat exchanger (5') is connected with the liquid outlet of the circulating pump (10) through the circulating liquid feeding pipe, and the liquid outlet of the second-stage tubular heat exchanger is connected with the, the gas outlet and the vacuum pump (6) of second grade shell and tube heat exchanger (5') are connected, the circulation liquid outlet of one-level smart titanium cistern (7) is connected with the inlet of second grade smart titanium cistern (9) through one-level smart titanium liquid pump (8), the hot titanium liquid export and the concentrator of one-level smart titanium cistern (7) are connected, the export of the crystallization titanium liquid of vacuum crystallizer (1) is connected with the inlet of second grade smart titanium liquid cistern (9) through filtration equipment, the liquid outlet of second grade smart titanium liquid cistern (9) is connected with the inlet of circulating pump (10).
2. The sulfuric acid process titanium dioxide vacuum crystallization system of claim 1, characterized in that: the tubular heat exchanger (3') comprises a shell (31), a first ring pipe (32) arranged in the shell (31), a second ring pipe (33) nested in the first ring pipe (32), and a plurality of heat exchange tubes (34) uniformly distributed in an annular cavity of the first ring pipe (32) and an annular cavity of the second ring pipe (33); a heat exchange space is formed between the second circular pipe (33) and the first circular pipe (32), and both an air inlet and an air outlet of the tubular heat exchanger (3') are communicated with the heat exchange space; the liquid inlet of the tubular heat exchanger (3 ') is connected with the liquid inlet of each heat exchange tube (34) through a titanium liquid inlet connecting tube (35), and the liquid outlet of the tubular heat exchanger (3') is connected with the liquid outlet of each heat exchange tube (34) through a titanium liquid outlet connecting tube.
3. The sulfuric acid process titanium dioxide vacuum crystallization system of claim 2, characterized in that: the structure of the secondary tube heat exchanger (5 ') is the same as that of the tube heat exchanger (3').
4. The sulfuric acid process titanium dioxide vacuum crystallization system of claim 1, characterized in that: the filtration equipment comprises a plate-and-frame filter press (11) and a vacuum disc filter (12), wherein a liquid inlet of the vacuum disc filter (12) is connected with a crystallized titanium liquid outlet of a vacuum crystallizer (1), a liquid outlet of the vacuum disc filter (12) is connected with a liquid inlet of the plate-and-frame filter press (11), and a liquid outlet of the plate-and-frame filter press (11) is connected with a liquid inlet of a secondary refined titanium liquid tank (9).
5. The sulfuric acid process titanium dioxide vacuum crystallization system of claim 1, 2, 3 or 4, wherein: and gas-liquid separators (13) are arranged on the connection between the gas outlet of the tubular heat exchanger (3 ') and the gas suction port of the secondary steam ejector (4) and the connection between the gas outlet of the secondary tubular heat exchanger (5') and the vacuum pump (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922319116.2U CN211920891U (en) | 2019-12-20 | 2019-12-20 | Sulfuric acid process titanium white powder vacuum crystallization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922319116.2U CN211920891U (en) | 2019-12-20 | 2019-12-20 | Sulfuric acid process titanium white powder vacuum crystallization system |
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| CN211920891U true CN211920891U (en) | 2020-11-13 |
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| CN201922319116.2U Active CN211920891U (en) | 2019-12-20 | 2019-12-20 | Sulfuric acid process titanium white powder vacuum crystallization system |
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