CN104692425A - Method for reducing smoking of dissolution dilution tank - Google Patents
Method for reducing smoking of dissolution dilution tank Download PDFInfo
- Publication number
- CN104692425A CN104692425A CN201310662822.1A CN201310662822A CN104692425A CN 104692425 A CN104692425 A CN 104692425A CN 201310662822 A CN201310662822 A CN 201310662822A CN 104692425 A CN104692425 A CN 104692425A
- Authority
- CN
- China
- Prior art keywords
- self
- heat exchange
- desiliconizing
- liquid
- discharging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a method for reducing smoking of a dissolution dilution tank. The method comprises the following steps: self-pressing a countdown first-level or countdown second-level self-evaporator discharging material on a first-level pre-desiliconization sleeve heat exchanger and perform liquid-liquid indirect heat exchange on the discharging material and pre-desiliconization feeding slurries; enabling self-evaporated discharging material slurries subjected to heat exchange and red mud washing liquid to enter a dilution tank to recover an original process. Because self-evaporation of a part of slurries and a part of self-evaporation devices are reduced, so that the temperature difference between the self-evaporation slurries and the pre-desiliconization slurries is improved; the heat transfer coefficient of the sleeve heat exchange equipment during liquid-liquid heat exchange is more than that of the equipment during steam-liquid heat exchange, so that the required liquid-liquid heat exchange is reduced; the heat exchange is carried out by performing self-evaporation and self-pressing of the discharging material, and additional equipment is not needed; because of liquid-liquid heat exchange, cold-sided heated materials are low-temperature pre-desiliconization slurries, and the temperature of the discharging material in a self-evaporation heat exchanger manner can be lower than that of the discharging material in a self-evaporation re-heat-exchange manner, so that the phenomenon of the smoking of the dilution tank is avoided.
Description
Technical field
The present invention relates to and a kind ofly reduce the method that process in leaching dilution trap emits vapour, especially adopt the Bayer Process digestion process of sleeve heat exchange, self-evaporatint n. cooling, belong to technical field of alumina production.
Background technology
Bayer process pre-desiliconizing is the Bayer process part in integrated process, operation important in pure Bayer process, in current explained hereafter, normally adopt sleeve preheating, heating, desiliconization slot stops, stripping operation is pumped to after adding alkali lye after mixing, in the preheating of slip, normally live steam heating is adopted completely in heat-processed, adopt Secondary-steam heating completely, and three kinds of modes such as part live steam and part Secondary-steam heating are carried out, secondary steam wherein can be the secondary steam of live steam condensed water flash distillation, also can be the secondary steam that stripping slurry self-evaporation process produces.
Bayer Process digestion is the Bayer process part in integrated process, very important operation in pure Bayer process, in current explained hereafter, normally adopt sleeve preheating, heating, digester stops, flash-pot flash distillation is lowered the temperature, the secondary steam flashed off returns sleeve preheating process and uses as thermal source, to reclaim the heat that high temperature discharging carries, flash-pot discharging enters dilution trap, what enter dilution trap also has red mud wash liquor simultaneously, in order to reduce flash-pot discharge concentration, reduce material viscosity, be beneficial to follow-up settling process, major equipment adopted in the process mainly contains double-tube heat exchanger, digester, flash-pot, dilution trap etc., the input and output material temperature difference is usually at about 15 DEG C.
For various reasons, a large amount of steam can be flashed off in the dilution of slip, and this some vapor due to steam parameter lower, utilize comparatively difficulty, in alumina producer, be generally used for heating red mud wash water, because quantity of steam is bigger than normal, heat exchange efficiency is on the low side, cause dilution trap secondary steam emptying in a large number, therefore whether dilution trap has secondary steam to discharge also becomes measurement alumina producer thermal utilization level important indicator just.
Summary of the invention
The present invention is exactly that provide to solve the problems of the technologies described above a kind of reduces the method that solution thinning groove emits vapour, and object is the problem that a large amount of secondary steams produced in dilution to solve stripping self-evaporatint n. slip cannot make full use of.
For reaching above-mentioned purpose, the present invention is a kind of reduces the method that solution thinning groove emits vapour, comprise the steps: that level last or the discharging of penultimate stage flash-pot are directly pressed onto first step pre-desiliconizing double-tube heat exchanger certainly and pre-desiliconizing feed slurry carries out liquid liquid indirect heat exchange, self-evaporatint n. discharging slip after heat exchange enters dilution trap together with red mud wash liquor, recovers original flow process.
The temperature of level last or the discharging of penultimate stage flash-pot, meets the heat that pre-desiliconizing slip is warming up to needed for pre-desiliconizing temperature in first step pre-desiliconizing double-tube heat exchanger be as the criterion with the lower the temperature heat that discharges of self-evaporatint n. discharging.
Flash-pot discharging is gone first step pre-desiliconizing double-tube heat exchanger to reclaim heat and is adopted self-pressure mode.
Pre-desiliconizing in first step pre-desiliconizing double-tube heat exchanger, slip preheating, heating, adopt the heat exchange of self-evaporatint n. slip liquid liquid to realize.
Whether described first step pre-desiliconizing double-tube heat exchanger slip out can be selected again by live steam double-tube heat exchanger, adopts live steam heating.
The temperature of the self-evaporatint n. discharging slip after described heat exchange, is as the criterion to add the rear unlikely generation hydrolysis of temperature of red mud wash liquor dilution.
The temperature of the self-evaporatint n. discharging slip after described heat exchange is at 95 ~ 115 DEG C.
Advantage of the present invention and effect as follows: owing to eliminating the self-evaporatint n. of part slip, decrease part self-evaporatint n. equipment, improve the temperature head between self-evaporatint n. slip and pre-desiliconizing slip, and the sleeve heat exchange equipment heat transfer coefficient during heat exchange of liquid liquid is when being greater than vapour-liquid heat exchange, decrease required heat interchanging area; Adopt self-evaporatint n. self-pressure discharge method to go heat exchange, do not need to increase extra equipment; Owing to adopting the heat exchange of liquid liquid, cold side heating object material is the pre-desiliconizing slip of low temperature, and after self-evaporatint n. discharging heat exchange, the temperature of discharging can be compared self-evaporatint n. heat exchange mode is some more low again, avoids the generation that dilution trap emits vapour phenomenon.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
In figure: 1, flash-pot discharging; 2, first step pre-desiliconizing double-tube heat exchanger; 3, self-evaporatint n. discharging after heat exchange; 4, pre-desiliconizing slip; 5, red mud wash liquor; 6, dilution trap; 7, live steam; 8, live steam double-tube heat exchanger.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but protection scope of the present invention not limit by embodiment.
Embodiment 1
A kind ofly as shown in the figure reduce the method that solution thinning groove emits vapour, comprise the steps: that level flash-pot last discharging 1 directly carries out liquid liquid indirect heat exchange from being pressed onto first step pre-desiliconizing double-tube heat exchanger 2 with pre-desiliconizing feed slurry 4, self-evaporatint n. discharging slip 3 after heat exchange enters dilution trap 6 together with red mud wash liquor 5, recovers original flow process.
The temperature of level flash-pot last discharging 1, meets the heat that pre-desiliconizing slip is warming up to needed for pre-desiliconizing temperature in first step pre-desiliconizing double-tube heat exchanger 2 be as the criterion with the lower the temperature heat that discharges of self-evaporatint n. discharging.
Flash-pot discharging 1 is gone first step pre-desiliconizing double-tube heat exchanger 2 to reclaim heat and is adopted self-pressure mode.
Pre-desiliconizing in first step pre-desiliconizing double-tube heat exchanger 2, slip preheating, heating, adopt the heat exchange of self-evaporatint n. slip liquid liquid to realize.
First step pre-desiliconizing double-tube heat exchanger 2 slip out adopts live steam 7 to heat and realizes in live steam double-tube heat exchanger 8.Live steam 7 is adopted to supplement partial heat.
The temperature of the self-evaporatint n. discharging slip 3 after heat exchange, dilutes the unlikely generation hydrolysis of rear temperature be as the criterion to add red mud wash liquor 5.The temperature of the self-evaporatint n. discharging slip 3 after heat exchange is at 95 ~ 115 DEG C.
Embodiment 2
A kind ofly reduce the method that solution thinning groove emits vapour, comprise the steps: that the discharging of penultimate stage flash-pot directly carries out liquid liquid indirect heat exchange from being pressed onto first step pre-desiliconizing double-tube heat exchanger 2 with pre-desiliconizing feed slurry 4, self-evaporatint n. discharging slip 3 after heat exchange enters dilution trap 6 together with red mud wash liquor 5, recovers original flow process.
The temperature of penultimate stage flash-pot discharging, meets the heat that pre-desiliconizing slip is warming up to needed for pre-desiliconizing temperature in first step pre-desiliconizing double-tube heat exchanger 2 be as the criterion with the lower the temperature heat that discharges of self-evaporatint n. discharging.
Flash-pot discharging is gone first step pre-desiliconizing double-tube heat exchanger 2 to reclaim heat and is adopted self-pressure mode.
Pre-desiliconizing preheating in first step pre-desiliconizing double-tube heat exchanger 2, heating, adopt the heat exchange of self-evaporatint n. slip liquid liquid to realize.
The temperature of the self-evaporatint n. discharging slip 3 after heat exchange, dilutes the unlikely generation hydrolysis of rear temperature be as the criterion to add red mud wash liquor 5.The temperature of the self-evaporatint n. discharging slip 3 after heat exchange is at 95 ~ 115 DEG C.
Claims (7)
1. reduce the method that solution thinning groove emits vapour, it is characterized in that comprising the steps:
Level last or penultimate stage flash-pot discharging (1) directly carry out liquid liquid indirect heat exchange from being pressed onto first step pre-desiliconizing double-tube heat exchanger (2) with pre-desiliconizing feed slurry (4), self-evaporatint n. discharging slip (3) after heat exchange enters dilution trap (6) together with red mud wash liquor (5), recovers original flow process.
2. according to claim 1ly a kind ofly reduce the method that solution thinning groove emits vapour, it is characterized in that the temperature of level last or penultimate stage flash-pot discharging (1), meet the heat that pre-desiliconizing slip is warming up to needed for pre-desiliconizing temperature in first step pre-desiliconizing double-tube heat exchanger (2) be as the criterion with the lower the temperature heat that discharges of self-evaporatint n. discharging.
3. according to claim 1ly a kind ofly reduce the method that solution thinning groove emits vapour, it is characterized in that described flash-pot discharging (1) is gone first step pre-desiliconizing double-tube heat exchanger (2) to reclaim heat and adopted self-pressure mode.
4. according to claim 1ly a kind ofly reduce the method that solution thinning groove emits vapour, it is characterized in that described first step pre-desiliconizing double-tube heat exchanger (2) interior pre-desiliconizing, slip preheating, heating, adopt the heat exchange of self-evaporatint n. slip liquid liquid to realize.
5. according to claim 1ly a kind ofly reducing the method that solution thinning groove emits vapour, it is characterized in that described first step pre-desiliconizing double-tube heat exchanger (2) slip out can again by adopting live steam heating to realize in live steam double-tube heat exchanger (8).
6. according to claim 1ly a kind ofly reduce the method that solution thinning groove emits vapour, it is characterized in that the temperature of the self-evaporatint n. discharging slip (3) after described heat exchange, be as the criterion with the unlikely generation hydrolysis of temperature after adding red mud wash liquor (5) dilution.
7. according to claim 1ly a kind ofly reduce the method that solution thinning groove emits vapour, it is characterized in that the temperature of the self-evaporatint n. discharging slip (3) after described heat exchange is at 95 ~ 115 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310662822.1A CN104692425A (en) | 2013-12-10 | 2013-12-10 | Method for reducing smoking of dissolution dilution tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310662822.1A CN104692425A (en) | 2013-12-10 | 2013-12-10 | Method for reducing smoking of dissolution dilution tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104692425A true CN104692425A (en) | 2015-06-10 |
Family
ID=53340044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310662822.1A Pending CN104692425A (en) | 2013-12-10 | 2013-12-10 | Method for reducing smoking of dissolution dilution tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104692425A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865144A (en) * | 2005-05-19 | 2006-11-22 | 贵阳铝镁设计研究院 | Complete single-sleeve preheating, insulating and leaching technology |
| CN101671042A (en) * | 2008-09-09 | 2010-03-17 | 中铝国际技术发展有限公司 | Alumina melting method |
| CN201605168U (en) * | 2009-12-28 | 2010-10-13 | 贵阳铝镁设计研究院 | Secondary steam pipeline connection structure of gibbsite dissolution work procedure self-evaporation device |
| CN102491385A (en) * | 2011-11-18 | 2012-06-13 | 中国铝业股份有限公司 | Method for using dissolved exhaust steam in alumina production |
| CN103101947A (en) * | 2013-03-11 | 2013-05-15 | 茌平信发华宇氧化铝有限公司 | Digesting process for aluminum oxide production process |
| CN103101942A (en) * | 2011-11-15 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Process for efficiently utilizing secondary steam in dissolution procedure |
-
2013
- 2013-12-10 CN CN201310662822.1A patent/CN104692425A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865144A (en) * | 2005-05-19 | 2006-11-22 | 贵阳铝镁设计研究院 | Complete single-sleeve preheating, insulating and leaching technology |
| CN101671042A (en) * | 2008-09-09 | 2010-03-17 | 中铝国际技术发展有限公司 | Alumina melting method |
| CN201605168U (en) * | 2009-12-28 | 2010-10-13 | 贵阳铝镁设计研究院 | Secondary steam pipeline connection structure of gibbsite dissolution work procedure self-evaporation device |
| CN103101942A (en) * | 2011-11-15 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Process for efficiently utilizing secondary steam in dissolution procedure |
| CN102491385A (en) * | 2011-11-18 | 2012-06-13 | 中国铝业股份有限公司 | Method for using dissolved exhaust steam in alumina production |
| CN103101947A (en) * | 2013-03-11 | 2013-05-15 | 茌平信发华宇氧化铝有限公司 | Digesting process for aluminum oxide production process |
Non-Patent Citations (1)
| Title |
|---|
| 周国盛: "强化压煮溶出技术创新", 《2008（太原）首届中西部十二省市自治区有色金属工业发展论坛论文集》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101735849B (en) | SAGD (steam-assisted gravity drainage) super-heavy oil high-temperature flash-evaporation dehydration method | |
| CN104230136B (en) | Sludge high temperature pyrohydrolysis combined vacuum flash-evaporation dehydration facture | |
| CN104030381B (en) | A kind of system and method utilizing oil field ground waste heat to prepare injection boiler feedwater | |
| CN102491385A (en) | Method for using dissolved exhaust steam in alumina production | |
| CN204034299U (en) | A kind of macromolecule vacuum distillation apparatus | |
| CN105561616A (en) | Gasification ash water low-pressure flash heat energy utilizing device and heat energy utilizing method thereof | |
| CN106276999A (en) | A kind of method recycling dissolution flash distillation exhaust steam in alumina producing | |
| CN103588179A (en) | Device and method for improving steam generating rate of low-temperature waste heat recovery system for sulfuric acid | |
| CN105271324B (en) | A kind of low pressure exhaust steam recycling system | |
| CN101498438A (en) | Condensed water reclaiming system | |
| CN207347506U (en) | A kind of system for recycling raw coke oven gas waste heat with conduction oil and carrying out ammonia still process | |
| CN103013817B (en) | Liquefaction equipment and liquefaction process for producing alcohol by using starchiness as raw material | |
| CN104692425A (en) | Method for reducing smoking of dissolution dilution tank | |
| CN104548638A (en) | Waste heat recovery process and device for heat pump evaporation unit | |
| CN101665259A (en) | Ore pulp heat exchange method and system | |
| CN103101942B (en) | Process for efficiently utilizing secondary steam in dissolution procedure | |
| CN103432766B (en) | The method and apparatus that hydrogen production from hydrocarbon condensate liquid reclaims | |
| CN210595933U (en) | Novel coal tar pitch preparation system | |
| CN105622667A (en) | Production method and system for co-production of acetyl chloride by 1-hydroxyethylidene-1,1-diphosphonicacid | |
| CN103979640A (en) | Softened water treatment system and method | |
| CN103113191A (en) | Method for producing pentaerythritol by removing formaldehyde through double rectification column | |
| CN204447357U (en) | Thermo-compression evaporation unit waste-heat recovery device | |
| CN103330260A (en) | Energy integration loop control system | |
| CN203904034U (en) | Softened water treatment system | |
| CN203710719U (en) | Cyclization reaction dehydrating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150610 |
|
| RJ01 | Rejection of invention patent application after publication |