CN105110354B - A kind of trona halogen concentrates and the method and apparatus of sodium bicarbonate hygroscopic water solution in alkali halogen - Google Patents
A kind of trona halogen concentrates and the method and apparatus of sodium bicarbonate hygroscopic water solution in alkali halogen Download PDFInfo
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Abstract
The invention discloses a kind of trona halogen to concentrate and NaHCO in alkali halogen3Wet decomposer；Including wet decomposition tower, vapour compression machine, reboiler and preheater；The outlet of hygroscopic water solution top gaseous phase 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 CO2Recovery line and steam condensation water recovery line；Reboiler tube-side inlet exports mutually with hygroscopic water solution tower bottom liquid and is connected, 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.This device reduces steam consumption and equipment investment, and energy consumption is low.
Description
Technical field
The present invention relates to a kind of trona halogen concentrate and sodium bicarbonate (NaHCO in alkali halogen3) method and apparatus of hygroscopic water solution, belonging to
Work field.
Background technology
Trona processing is prepared the technique of soda and is substantially divided into two kinds: evaporation and carbonation method.Evaporation is divided into again sesquialter alkali work
Skill and monohydrate sodium carbonate technique.With sal soda stone (Na2CO3·NaHCO3·2H2O) trona being main can use sesquialter alkali technique to produce
Soda.If making NaHCO3 decompose before the evaporation, as dry calcination, hygroscopic water solution or molten adopt time neutralized by NaOH, then
Na is separated out during evaporation2CO3·H2O, can use monohydrate sodium carbonate technique to produce heavy soda ash, or use the one of evaporation limit, limit hygroscopic water solution
Footwork monohydrate sodium carbonate flow process produces heavy soda ash.For part salt, alkali, the alkali ore deposit of nitre symbiosis, then can use carbonation method.
The most general wet decomposition tower flow process is: enter hygroscopic water solution tower top after salt is preheated, and raw steam is directly entered wet decomposition tower
The end, NaHCO3Na is being resolved into from top to bottom after the filler loaded in wet decomposition tower or tower tray2CO3、CO2And water, point
Solve the CO generated2Discharge from tower top with steam, decompose the Na generated2CO3Discharge from the bottom of tower with the salt after decomposing with water.Cause
For using live (open) steam stripping, wet decomposition tower only serves the effect of hygroscopic water solution, it is impossible to reach the purpose of concentrated brine.Salt passes through
Wet decomposition tower is by NaHCO contained therein3Major part is decomposed into Na2CO3, the salt devaporation crystallizer again after decomposition evaporates water
Analyze monohydrate sodium carbonate (NaCO3·H2O) crystal.The steam stripper that such wet decomposition tower is similar in rectification, tower
The heat that the end does not set entrained by reboiler, steam and steam is directly entered in tower.
The wet decomposition technique that commercial Application is more advanced at present is hygroscopic water solution and two processes of falling film evaporation to be combined, wet decomposition tower
Pressurized operation, falling film evaporator atmospheric operation.Idiographic flow is: entering hygroscopic water solution tower top after salt is preheated, overhead extraction contains
There is part CO2Water vapour enter falling film evaporator shell side, at the bottom of wet decomposition tower decompose after salt enter falling film evaporator tube side,
The steam that falling film evaporator produces is directly entered at the bottom of wet decomposition tower, after falling film evaporator evaporation and concentration after compressor compression pressure-raising
Salt enters next process.The feature of this technique is to utilize hygroscopic water solution overhead vapours as the thermal source of falling film evaporation, then will drop
Wet decomposition tower is returned as stripped vapor after the secondary air pressure contracting that film evaporation produces.This technique reduces energy consumption, but due to hygroscopic water solution
Tower uses pressurized operation, and pressure increase causes CO2Dissolubility raises so that NaHCO3Resolution ratio reduce, only 70%
Left and right.Consequently, it is possible to this technique can not be directly for producing monohydrate sodium carbonate offer salt, in addition it is also necessary to use in Caustic soda and concentrate alkali halogen, so
The rear crystallizing evaporator monohydrate sodium carbonate technique that just can be sent to prepares heavy soda ash.It addition, in this technique, in order to prepare Caustic soda, produce
A large amount of lime muds are the most disposable, the inadequate environmental protection of technique.
Summary of the invention
The key technical problem that the invention solves the problems that is to overcome the deficiencies in the prior art, it is provided that a kind of hygroscopic water solution produces heavy soda ash
System and method.
The trona halogen of the present invention concentrates and NaHCO in alkali halogen3The device of hygroscopic water solution, including following device: wet decomposition tower, steams
Vapour compressor, reboiler, two preheaters.The outlet of described hygroscopic water solution top gaseous phase is connected with suction port of compressor, compressor outlet
Being connected to reboiler shell side inlet, reboiler shell-side outlet is connected with feed preheater shell side inlet, feed preheater shell-side outlet
It is connected respectively to CO2Recovery line and steam condensation water recovery line.Reboiler tube-side inlet exports mutually with hygroscopic water solution tower bottom liquid and is connected,
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 and raw material
Preheater tube-side inlet connects, and tube side outlet is then connected to the tube-side inlet of vapor preheater, the tube side outlet of vapor preheater with
Tower top fluid inlet connects.The shell side inlet of vapor preheater connects low pressure water vapor, and shell-side outlet connects steam condensation water recovery line.
The trona halogen of the present invention concentrates and NaHCO in alkali halogen3The method of hygroscopic water solution, comprises the following steps:
(1) rich in NaHCO3Alkali halogen after feed preheater, vapor preheater altogether two-stage preheater is preheating to bubble point, enter normal pressure
Hygroscopic water solution tower top, is decomposed into Na in tower2CO3、CO2And water, NaHCO3The wet resolution ratio of one-level can reach 90%.
(2) by tower top CO Han finite concentration2Water vapour compress through compressor, improve and mix with supplementary live steam after potential temperature,
Reboiler shell side is entered as thermal source.In reboiler, overwhelming majority water vapour is condensed into water, fraction water vapour and CO2Make
For fixed gas extraction, remove feed preheater preheating material.After feed preheater, the water vapour overwhelming majority has been condensed into
Water, CO2As fixed gas extraction.
Raw material after preheating because of feed preheater still can not reach bubble point, if directly entering tower, then affects wet resolution ratio, therefore former
After material preheater, a vapor preheater is set, by raw material preheating to bubble point.
Hygroscopic water solution tower bottom reboiler provides heat for wet decomposition tower, but uses dividing wall type heat exchanger, no longer injects water in alkali halogen
Point, not only can reach to concentrate the purpose of alkali halogen, and improve NaHCO further through concentrating alkali halogen3Wet resolution ratio.
Produced Liquid at the bottom of wet decomposition tower can directly 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, sends into wet decomposition tower top, and wet decomposition tower often uses
Press operation, tower top temperature about 101 DEG C is (containing part CO2)。
The most described steam of step pressure after compressor compresses is about 0.07MPa (G).
Fixed gas (high concentration CO after the compression that step is (2) described2) after feed preheater extraction, can be used for carbonation method production
In sodium bicarbonate technique.
The present invention has the advantage that: wet decomposition tower atmospheric operation, it is to avoid CO during pressurized operation2What dissolubility increase caused divides
Solution rate reduces；Use dividing wall type heat exchanger (reboiler) at the bottom of tower, be not passed through live (open) steam, in system, do not add moisture, wet
The effect concentrating alkali halogen can be played while decomposition, and by concentrating alkali halogen, wet resolution ratio can be improved further, always decompose
Rate can reach more than 90%.Employing is calmed the anger distillation technique, and total energy consumption is greatly reduced.Containing high concentration CO after hygroscopic water solution2Secondary steam
Vapour after compression, as the thermal source of tower bottom reboiler, the fixed gas (CO after heat exchange2) to go after pre-hot brine carbonators to produce little
Soda, concentrates alkali halogen and can be not added with Caustic soda direct devaporation crystallizer, uses monohydrate sodium carbonate technique to obtain heavy soda ash.
The hygroscopic water solution technological process of present invention exploitation, technique is simple, NaHCO3Resolution ratio is high, environmentally friendly, shortens sky
So the technological process of alkali soda, reduces production cost.
Accompanying drawing explanation
Fig. 1: apparatus of the present invention schematic diagram；
Wherein: the wet decomposition tower of C1-；P1-vapour compression machine；E1-reboiler；E2-feed preheater；E3-vapor preheater.
Logistics illustrates: 1-refines alkali halogen；2-fixed gas；3-steam condensation water；4-concentrates alkali halogen；5-supplements raw steam；The low setting-out of 6-
Steam；7-steam condensation water.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings:
As shown in Figure 1: the trona halogen of the present invention concentrates and NaHCO in alkali halogen3The device of hygroscopic water solution, including following device:
Wet decomposition tower C1, vapour compression machine P1, reboiler E1, feed preheater E2 and vapor preheater E3.Described wet decomposition tower
Top gaseous phase outlet is connected with suction port of compressor, and compressor outlet is connected to reboiler shell side inlet, reboiler shell-side outlet and raw material
Preheater shell side inlet connects, and feed preheater shell-side outlet is connected respectively to CO2Recovery line and steam condensation water recovery line.
Reboiler tube-side inlet exports mutually with hygroscopic water solution tower bottom liquid and is connected, and tube side outlet is connected to wet decomposition tower spirit and returns tower mouth mutually.Raw material
Pipeline is connected with feed preheater tube-side inlet, and tube side outlet is then connected to the tube-side inlet of vapor preheater, vapor preheater
Tube side outlet 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, Na2CO3Content 74.62g/l, NaHCO3Content 121.13g/l, NaCl
The refined alkali halogen (material 1) of content 6.75g/l, through transport pump, is first preheating to 57 DEG C through feed preheater E2, pre-through steam again
Hot device E3 is preheating to 104 DEG C, enters wet decomposition tower C1 top.Wet decomposition tower C1 atmospheric operation, a materials at bottom of tower part is entered
Entering reboiler E1 tube side, gasifying in heated rear section, returns at the bottom of wet decomposition tower C1 tower, and a part of extraction is as concentrating alkali halogen (thing
Stream 4) devaporation Crystallization Procedure.In the concentration alkali halogen obtained, moisture is reduced to 317.6t/h by 424.8t/h, and water evaporation quantity is
107.2t/h；NaHCO in alkali halogen3Content is reduced to 3.93t/h, NaHCO in alkali halogen by 56.4t/h3Resolution ratio is 93.03%.
Overhead vapours is compressed to 0.07MPa (G) through compressor, sends into reboiler E1 shell side top together with supplementary raw steam (logistics 5)
As thermal source, fixed gas (logistics 2, mainly CO2, with part water vapour) from reboiler E1 shell side top extraction, steam
Vapor condensed water (logistics 3) from reboiler E1 shell side bottom extraction, then go feed preheater E2 as thermal source by refined alkali halogen by
25 DEG C are heated to 57 DEG C.
Present invention trona halogen hygroscopic water solution that is open and that propose produces device and production method, those skilled in the art of heavy soda ash
Can be by using for reference present disclosure, the link such as suitable feed change and process route realizes, although the method for the present invention and technology of preparing
Being described by preferred embodiment, person skilled substantially can be without departing from present invention, spirit and scope
Methods and techniques described herein route is modified or reconfigures, realizes final technology of preparing.Of particular note
, all similar replacements and change apparent to those skilled in the art, they are considered as being included in
In present invention spirit, scope and content.
Claims (5)
1. a trona halogen concentrates and NaHCO in alkali halogen3Wet decomposer；Including wet decomposition tower, vapour compression machine, 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 CO2Recovery line and steam condensation water recovery line；Reboiler tube-side inlet exports mutually with hygroscopic water solution tower bottom liquid and is connected, and in tube side, liquid phase is by thermal evaporation, and the outlet of tube side gas-liquid 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.
2. the method that trona halogen hygroscopic water solution produces heavy soda ash, is characterized in that step is as follows:
(1) rich in NaHCO3Alkali halogen after feed preheater, vapor preheater altogether two-stage preheater is preheating to bubble point, enter normal pressure hygroscopic water solution tower top, tower is decomposed into Na2CO3、CO2And water；
(2) by tower top containing CO2Water vapour through compressor compress, thermal source enter reboiler shell side；In reboiler, part water vapour is condensed into water, part water vapour and CO2As fixed gas extraction, remove feed preheater preheating material；After feed preheater, the water vapour overwhelming majority has been condensed into water, CO2As fixed gas extraction.
3. method as claimed in claim 2, is characterized in that the alkali halogen described in step is (1) is preheating to 104 DEG C through two-stage, sends into wet decomposition tower top, wet decomposition tower uses atmospheric operation, tower top temperature about 101 DEG C.
4. method as claimed in claim 2, is characterized in that described step (2) steam pressure after compressor compresses is 0.07MPa.
5. method as claimed in claim 2, is characterized in that the fixed gas after the compression (2) of described step produces sodium bicarbonate for carbonation method after feed preheater extraction.
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| CN107354024A (en) * | 2017-07-26 | 2017-11-17 | 天津大学 | A kind of trona stew in soy sauce is for the net device and method of the soda ash mother liquid production fruits and vegetables after soda ash |
| CN108097193A (en) * | 2017-09-27 | 2018-06-01 | 青岛海湾集团有限公司 | A kind of wet decomposition tower and wet decomposition technique |
| CN109809437A (en) * | 2017-11-20 | 2019-05-28 | 内蒙古博源控股集团有限公司 | Novel energy-saving environment-friendly heavy soda ash production technology and system |
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| CN201089726Y (en) * | 2007-08-30 | 2008-07-23 | 内蒙古博源工程有限责任公司 | System for producing low salt strong mass soda |
| CN100556811C (en) * | 2007-08-30 | 2009-11-04 | 内蒙古博源工程有限责任公司 | A kind of production method of low-salt dense soda ash and the system that produces low-salt dense soda ash thereof |
| CN101503204B (en) * | 2009-01-19 | 2010-11-10 | 河南中源化学股份有限公司 | Wet decomposition evaporation alkali production technique for NaHCO3 alkali halide |
| CN101708857A (en) * | 2009-11-20 | 2010-05-19 | 大连化工研究设计院 | Process for preparing low-salt heavy soda ash |
| CN204824209U (en) * | 2015-08-12 | 2015-12-02 | 天津大学 | Wet decomposition device of sodium bicarbonate during steamed concentration of trona and alkali are steamed |
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