CN204824209U - Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed - Google Patents
Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed Download PDFInfo
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- CN204824209U CN204824209U CN201520608816.2U CN201520608816U CN204824209U CN 204824209 U CN204824209 U CN 204824209U CN 201520608816 U CN201520608816 U CN 201520608816U CN 204824209 U CN204824209 U CN 204824209U
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- tower
- reboiler
- tube
- outlet
- preheater
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Abstract
The utility model discloses a wet decomposition device of naHCO3 during steamed concentration of trona and alkali are steamed, including wet decomposition tower, vapor compressor, reboiler and pre -heater, the wet decomposition tower of characterized by pushes up gas exports and is connected with the suction port of compressor, compressor exit linkage to reboiler shell side entry, and export of reboiler shell side and feed preheater shell side entry linkage, the export of feed preheater shell side is connected to CO2 recovery pipeline respectively and steam congeals the water recovery pipeline, liquid phase exit linkage at the bottom of reboiler tube side entry and the decomposition tower that wets, raw tube line and feed preheater tube side entry linkage, tube side export then are connected to the tube side entry of steam pre -heater, the tube side export and the top of the tower liquid phase access connection of steam pre -heater. The device greatly reduced vapour consumption and equipment investment, have simple process, friendly to environment, energy consumption low grade advantage.
Description
Technical field
The utility model relates to a kind of urao halogen and concentrates and sodium bicarbonate (NaHCO in alkali halogen
3) wet decomposer, belong to chemical field.
Background technology
The technique that soda ash is prepared in urao processing is divided into two kinds substantially: method of evaporation and carbonation method.Method of evaporation is divided into again sesquialter alkali technique and monohydrate sodium carbonate technique.With sal soda stone (Na
2cO
3naHCO
32H
2o) be that main urao can adopt sesquialter alkali explained hereafter soda ash.If make NaHCO3 decompose before the evaporation, as dry calcination, hygroscopic water solution or molten adopt time neutralized by NaOH, then evaporation time separate out Na
2cO
3h
2o, can adopt monohydrate sodium carbonate explained hereafter Soda Ash Danse, or adopts the single stage method monohydrate sodium carbonate flow process of evaporation limit, limit hygroscopic water solution to produce Soda Ash Danse.For the alkali ore deposit of part salt, alkali, nitre symbiosis, then carbonation method can be adopted.
Wet decomposition tower flow process general is at present: bittern enters hygroscopic water solution tower top after preheating, and raw steam directly enters at the bottom of wet decomposition tower, NaHCO
3na is being resolved into from top to bottom after the filler that loads in wet decomposition tower or tower tray
2cO
3, CO
2and water, decompose the CO generated
2discharge from tower top with steam, decompose the Na generated
2cO
3discharge at the bottom of tower with the bittern after decomposition with water.Because adopt open steam stripping, wet decomposition tower only plays the effect of hygroscopic water solution, can not reach the object of concentrated brine.The wet decomposition tower of bittern process incites somebody to action wherein contained NaHCO
3major part is decomposed into Na
2cO
3, the bittern after decomposition again devaporation crystallizer evaporating off water analyzes monohydrate sodium carbonate (NaCO
3h
2o) crystal.Such wet decomposition tower is similar to the water vapour stripping tower in rectifying, does not establish reboiler at the bottom of tower, and water vapour and the heat entrained by water vapour directly enter in tower.
The more advanced wet decomposition technique of current industrial application is combined at hygroscopic water solution and falling film evaporation two processes, wet decomposition tower pressurized operation, falling-film evaporator atmospheric operation.Idiographic flow is: bittern enters hygroscopic water solution tower top after preheating, and overhead extraction contains part CO
2water vapor enter falling-film evaporator shell side, bittern after decomposing at the bottom of wet decomposition tower enters falling-film evaporator tube side, the steam that falling-film evaporator produces directly enters at the bottom of wet decomposition tower after compressor compression pressure-raising, and the bittern after falling-film evaporator evaporation concentration enters next process.The feature of this technique utilizes hygroscopic water solution overhead vapours as the thermal source of falling film evaporation, returns wet decomposition tower as stripped vapor after the secondary air pressure contracting then falling film evaporation produced.This technique reduces energy consumption, but due to wet decomposition tower employing pressurized operation, and pressure increase causes CO
2solubleness raises, and makes NaHCO
3rate of decomposition reduce, be only about 70%.Thus, this technique directly can not provide bittern for producing monohydrate sodium carbonate, also needs to use in caustic soda and concentrated alkali halogen, then just can be sent to evaporative crystallizer monohydrate sodium carbonate technique and prepare Soda Ash Danse.In addition, in this technique, in order to prepare caustic soda, producing a large amount of lime mud and not easily processing, the inadequate environmental protection of technique.
Summary of the invention
Key technical problem to be solved in the utility model overcomes the deficiencies in the prior art, provides a kind of hygroscopic water solution to produce the system of Soda Ash Danse.
Urao halogen of the present utility model concentrates and NaHCO in alkali halogen
3the device of hygroscopic water solution, comprises as lower device: wet decomposition tower, vapour compressor, reboiler, two preheaters.Described hygroscopic water solution top gaseous phase outlet is connected with suction port of compressor, and compressor outlet is connected to reboiler shell side inlet, and reboiler shell-side outlet is connected with feed preheater shell side inlet, and feed preheater shell-side outlet is connected respectively to CO
2recovery line and steam condensation water recovery line.Reboiler tube-side inlet is connected with liquid-phase outlet at the bottom of wet decomposition tower, and in tube side, liquid phase is heated vaporization, and the outlet of tube side liquid-vapor mixture is connected to wet decomposition tower spirit and returns tower mouth mutually.Feed line is connected with feed preheater tube-side inlet, and tube side outlet is then connected to the tube-side inlet of vapor preheater, and the tube side outlet of vapor preheater is connected with tower top fluid inlet.The shell side inlet of vapor preheater connects low pressure water vapor, and shell-side outlet connects steam condensation water recovery line.
Utilize device of the present utility model to carry out urao halogen to concentrate and NaHCO in alkali halogen
3the method of hygroscopic water solution, comprises the following steps:
(1) be rich in NaHCO
3alkali halogen after feed preheater, vapor preheater altogether two-stage preheater preheats to bubble point, enter normal pressure hygroscopic water solution tower top, in tower, be decomposed into Na
2cO
3, CO
2and water, NaHCO
3the one-level rate of decomposition that wets can reach 90%.
(2) tower top is contained finite concentration CO
2water vapor compress through compressor, improve after potential temperature and mix with supplementary live steam, enter reboiler shell side as thermal source.In reboiler, most water vapor condensation is water, small portion water vapor and CO
2as non-condensable gas extraction, remove feed preheater preheating material.After feed preheater, the water vapor overwhelming majority is condensed into water, CO
2as non-condensable gas extraction.
Because the raw material after feed preheater preheating still can not reach bubble point, if directly enter tower, then the wet rate of decomposition of impact, therefore a vapor preheater is set after feed preheater, by raw material preheating to bubble point.
Hygroscopic water solution tower bottom reboiler provides heat for wet decomposition tower, but adopts recuperative heat exchanger, no longer in alkali halogen, injects moisture, not only can reach the object of concentrated alkali halogen, and improves NaHCO by concentrating alkali halogen again
3wet rate of decomposition.
At the bottom of wet decomposition tower, Produced Liquid directly can send to the evaporative crystallization operation of monohydrate sodium carbonate technique.
The (1) described refined natural alkali halogen of step is preheating to 104 DEG C through two-stage, and send into wet decomposition tower top, wet decomposition tower adopts atmospheric operation, and tower top temperature about 101 DEG C is (containing part CO
2).
Step (2) described steam pressure after compressor compression is about 0.07MPa (G).
Non-condensable gas (high concentration CO after the compression that step is (2) described
2) can be used for after feed preheater extraction carbonation method production sodium bicarbonate technique.
The advantage that the utility model has is: wet decomposition tower atmospheric operation, CO when avoiding pressurized operation
2solubleness increases the rate of decomposition caused and reduces; Adopt recuperative heat exchanger (reboiler) at the bottom of tower, do not pass into open steam, in system, do not add moisture, the effect of concentrated alkali halogen can be played while hygroscopic water solution, and by concentrated alkali halogen, can improve wet rate of decomposition further, total rate of decomposition can reach more than 90%.Employing is calmed the anger distillation technique, significantly reduces total energy consumption.Containing high concentration CO after hygroscopic water solution
2secondary steam after compression, as the thermal source of tower bottom reboiler, the non-condensable gas (CO after heat exchange
2) go carbonating tower to produce sodium bicarbonate after pre-hot brine, concentrated alkali halogen can not add the direct devaporation crystallizer of caustic soda, adopts monohydrate sodium carbonate technique to obtain Soda Ash Danse.
The wet decomposer of the utility model exploitation, operation is simple, NaHCO
3rate of decomposition is high, environmentally friendly, shortens the technical process of natural soda purification, reduces production cost.
Accompanying drawing explanation
Fig. 1: the utility model device schematic diagram;
Wherein: C1-wets decomposition tower; P1-vapour compressor; E1-reboiler; E2-feed preheater; E3-vapor preheater.
Logistics illustrates: 1-refines alkali halogen; 2-non-condensable gas; 3-steam condensation water; 4-concentrates alkali halogen; 5-supplements raw steam; 6-low pressure water vapor; 7-steam condensation water.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
As shown in Figure 1: urao halogen of the present utility model concentrates and NaHCO in alkali halogen
3the device of hygroscopic water solution, comprises as lower device: wet decomposition tower C1, vapour compressor P1, reboiler E1, feed preheater E2 and vapor preheater E3.Described hygroscopic water solution top gaseous phase outlet is connected with suction port of compressor, and compressor outlet is connected to reboiler shell side inlet, and reboiler shell-side outlet is connected with feed preheater shell side inlet, and feed preheater shell-side outlet is connected respectively to CO
2recovery line and steam condensation water recovery line.Reboiler tube-side inlet is connected with liquid-phase outlet at the bottom of wet decomposition tower, and tube side outlet is connected to wet decomposition tower spirit and returns tower mouth mutually.Feed line is connected with feed preheater tube-side inlet, and tube side outlet is then connected to the tube-side inlet of vapor preheater, and the tube side outlet of vapor preheater is connected with tower top fluid inlet.The shell side inlet of vapor preheater connects low pressure water vapor, and shell-side outlet connects steam condensation water recovery line.
Embodiment 1: temperature 25 DEG C, flow 520t/h, Na
2cO
3content 74.62g/l, NaHCO
3the refining alkali halogen (material 1) of content 121.13g/l, NaCl content 6.75g/l, through pump delivery, is first preheating to 57 DEG C through feed preheater E2, is preheating to 104 DEG C again, enters wet decomposition tower C1 top through vapor preheater E3.Wet decomposition tower C1 atmospheric operation, a materials at bottom of tower part enters reboiler E1 tube side, and through the gasification of heating rear section, return at the bottom of wet decomposition tower C1 tower, a part of extraction is as concentrated alkali halogen (logistics 4) devaporation Crystallization Procedure.In the concentrated alkali halogen obtained, moisture reduces to 317.6t/h by 424.8t/h, and water evaporation quantity is 107.2t/h; NaHCO in alkali halogen
3content is reduced to 3.93t/h by 56.4t/h, NaHCO in alkali halogen
3rate of decomposition is 93.03%.Overhead vapours is compressed to 0.07MPa (G) through compressor, sends into reboiler E1 shell side top as thermal source, non-condensable gas (logistics 2, mainly CO together with supplementary raw steam (logistics 5)
2, with part water vapor) and from the top extraction of reboiler E1 shell side, steam condensation water (logistics 3), from the bottom extraction of reboiler E1 shell side, then goes feed preheater E2, as thermal source, refining alkali halogen is heated to 57 DEG C by 25 DEG C.
The utility model urao halogen hygroscopic water solution that is open and that propose produces Soda Ash Danse device, those skilled in the art are by using for reference present disclosure, the links such as appropriate change raw material and operational path realize, although method of the present utility model and technology of preparing are described by preferred embodiment, person skilled obviously can change Method and Technology route as herein described or reconfigure not departing from the utility model content, spirit and scope, realizes final technology of preparing.Special needs to be pointed out is, all similar replacements and change apparent to those skilled in the art, they are deemed to be included in the utility model spirit, scope and content.
Claims (1)
1. a urao halogen concentrates and NaHCO in alkali halogen
3wet decomposer; Comprise wet decomposition tower, vapour compressor, reboiler and preheater; It is characterized in that the outlet of hygroscopic water solution top gaseous phase is connected with suction port of compressor, compressor outlet is connected to reboiler shell side inlet, and reboiler shell-side outlet is connected with feed preheater shell side inlet, and feed preheater shell-side outlet is connected respectively to CO
2recovery line and steam condensation water recovery line; Reboiler tube-side inlet is connected with liquid-phase outlet at the bottom of wet decomposition tower, and in tube side, liquid phase is heated vaporization, and the outlet of tube side liquid-vapor mixture is connected to wet decomposition tower spirit and returns tower mouth mutually; Feed line is connected with feed preheater tube-side inlet, and tube side outlet is then connected to the tube-side inlet of vapor preheater, and the tube side outlet of vapor preheater is connected with tower top fluid inlet; The shell side inlet of vapor preheater connects low pressure water vapor, and shell-side outlet connects steam condensation water recovery line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520608816.2U CN204824209U (en) | 2015-08-12 | 2015-08-12 | Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520608816.2U CN204824209U (en) | 2015-08-12 | 2015-08-12 | Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed |
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| Publication Number | Publication Date |
|---|---|
| CN204824209U true CN204824209U (en) | 2015-12-02 |
Family
ID=54681831
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|---|---|---|---|
| CN201520608816.2U Withdrawn - After Issue CN204824209U (en) | 2015-08-12 | 2015-08-12 | Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed |
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|---|---|
| CN (1) | CN204824209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110354A (en) * | 2015-08-12 | 2015-12-02 | 天津大学 | Method and device for concentrating natural alkali halide and wet-decomposing sodium hydrogen carbonate in alkali halide |
-
2015
- 2015-08-12 CN CN201520608816.2U patent/CN204824209U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110354A (en) * | 2015-08-12 | 2015-12-02 | 天津大学 | Method and device for concentrating natural alkali halide and wet-decomposing sodium hydrogen carbonate in alkali halide |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151202 Effective date of abandoning: 20161005 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |