CN101659450B - Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate - Google Patents
Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate Download PDFInfo
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- CN101659450B CN101659450B CN 200810012997 CN200810012997A CN101659450B CN 101659450 B CN101659450 B CN 101659450B CN 200810012997 CN200810012997 CN 200810012997 CN 200810012997 A CN200810012997 A CN 200810012997A CN 101659450 B CN101659450 B CN 101659450B
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Abstract
The invention relates to a spontaneous evaporation process of steam condensate and belongs to the technical field of alumina production. The process is provided for a crude liquid desiliconizing working procedure in alumina production by a mixed combination method. In the process, new steam condensate and secondary steam condensate enter the same spontaneous evaporation system for spontaneous evaporation, spontaneously evaporated steam is used to preheat a desiliconizing stock solution, and final stage condensate flows to a red mud washing working procedure to be used as red mud washing water. The processes of the invention avoids the use of a condensate spontaneous evaporation system, thereby reducing investments in equipment and automatic control and simplifying pipe arrangement in a secondary steam preheating system. In addition, the process delivers process return water that cannot be used by the power plants back to the red mud washing working procedure to use the return water as the red mud washing water, thereby fully recycling heat carried by steam condensate.
Description
Technical field
The present invention relates to self-evaporation technology of steam condensate, belong to technical field of alumina production.
Background technology
In producing alumina by mixed combined process, the main process of desiliconizing crude liquid obtained operation is: desiliconization dope through secondary steam preheating and live steam heating, stops through desilicator respectively, enters slip flash-pot self-evaporatint n. cooling at last, and the dashpot discharging enters subsequent processing.Following two water of condensation source is arranged in the production process of this operation usually: the one, after the mode of employing secondary steam indirect preheating, live steam indirect heating realized the intensification of desiliconization dope, the vapor condensation after heat exchange was a water; The 2nd, after the desiliconization slurries entered the slip flash-pot, through the self-evaporatint n. cooling, self-evaporatint n. went out portion water from solution, is called secondary steam, also is condensed into water through heat exchange, and above two portions water of condensation all needs to reclaim entrained heat and water.
Producing alumina by mixed combined process has its certain singularity, is embodied in having in the utilization of water of condensation:
1, in the producing alumina by mixed combined process flow process, there are desiliconizing crude liquid obtained, mother liquid evaporation and three operations of Bayer process stripping can produce steam condensate altogether, can return the power station.
2, the live steam condensed water of Bayer process stripping operation and secondary steam water of condensation are distinct, and when detection was qualified, whole steam condensates that the stripping operation produces all will return the power station, as boiler water-filling; The live steam condensed water of mother liquid evaporation operation is mixed in the secondary steam water of condensation, and when detection was qualified, the steam condensate that evaporization process produces also all will return the power station, as boiler water-filling.
3, advance the water temperature that the boiler desalting system mixes bed and can not be higher than 40 ℃, if the temperature height of technology backwater is then wanted earlier and power station de-mineralized water heat exchange cooling; Otherwise the water tower that dries in the air will be set, with technology backwater forced cooling.
For a specific mixed combining method alumina producer, the desalination water yield that is used for to the cooling of technology backwater that the power station can provide is certain, can't be with whole technology backwater coolings, therefore how rationally utilizing steam condensate in this case is exactly problem to be solved by this invention.
Summary of the invention
The present invention is exactly in order to solve the problems of the technologies described above, and provide live steam condensed water and the common self-evaporatint n. technology of secondary steam water of condensation, purpose is the desiliconizing crude liquid obtained operation for the mixed combining method alumina producing, provide a kind of live steam condensed water and secondary steam water of condensation have been sent into same self-evaporatint n. system, the heat that the recovered steam water of condensation is entrained, and rationally utilize the self-evaporatint n. technical process of steam condensate.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions, the common self-evaporatint n. technology of live steam condensed water and secondary steam water of condensation, it comprises the steps: in the desiliconizing crude liquid obtained operation of mixed combining method alumina producing, live steam condensed water and secondary steam water of condensation enter same set of self-evaporatint n. system and carry out self-evaporatint n., the secondary steam that self-evaporatint n. goes out removes the preheating desiliconization dope, and the final stage water of condensation goes the laterite washing operation, as the red mud wash water.
Described live steam condensed water is through the resulting water of condensation of indirect heating interchanger heat exchange by live steam.
Described secondary steam water of condensation is the secondary steam resulting water of condensation of condensation behind preheating desiliconization dope indirect heat exchange that is come out by self-evaporatint n. from slip.
Described live steam condensed water mixes with the secondary steam water of condensation.
Advantage of the present invention and effect are as follows:
1, reduced by a cover water of condensation self-evaporatint n. system, reduced equipment, controlled investment automatically, simplified the pipeline configuration of secondary steam pre-heating system.
2, the technology backwater that the power station can't be digested send the laterite washing operation, uses as the red mud wash water, has fully reclaimed the entrained heat of steam condensate.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
In the accompanying drawing: 1, live steam condensed water; 2, secondary steam water of condensation; 3, water of condensation flash-pot; 4, final stage water of condensation discharging; 5, secondary steam.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is described further, but protection scope of the present invention is not limit by embodiment.
Embodiment 1: the common self-evaporatint n. technology of live steam condensed water and secondary steam water of condensation, in the desiliconizing crude liquid obtained operation, desiliconization dope enters desilicator and stops after secondary steam preheating and live steam heating, after the cooling of slip flash-pot, the secondary steam that self-evaporatint n. is come out removes the preheating desiliconization dope, and subsequent processing is removed in the dashpot discharging.Wherein, live steam is condensed into live steam condensed water 1 after the heat exchange of indirect heating interchanger, the secondary steam that self-evaporatint n. is come out from slip is condensed into secondary steam water of condensation 2 behind preheating desiliconization dope indirect heat exchange, two places come water to enter same set of water of condensation flash-pot 3, the secondary steam 5 that self-evaporatint n. goes out removes the preheating desiliconization dope, final stage water of condensation 4 goes the laterite washing operation, as the red mud wash water.
Claims (2)
1. the common self-evaporatint n. technology of live steam condensed water and secondary steam water of condensation, it is characterized in that it comprises the steps: in the desiliconizing crude liquid obtained operation of mixed combining method alumina producing, live steam condensed water and secondary steam water of condensation enter same set of self-evaporatint n. system and carry out self-evaporatint n., the secondary steam that self-evaporatint n. goes out removes the preheating desiliconization dope, the final stage water of condensation goes the laterite washing operation, as the red mud wash water; Described live steam condensed water is through the resulting water of condensation of indirect heating interchanger heat exchange by live steam; Described secondary steam water of condensation is the secondary steam resulting water of condensation of condensation behind preheating desiliconization dope indirect heat exchange that is come out by self-evaporatint n. from slip.
2. the common self-evaporatint n. technology of live steam condensed water according to claim 1 and secondary steam water of condensation is characterized in that described live steam condensed water mixes with the secondary steam water of condensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810012997 CN101659450B (en) | 2008-08-28 | 2008-08-28 | Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810012997 CN101659450B (en) | 2008-08-28 | 2008-08-28 | Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate |
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| Publication Number | Publication Date |
|---|---|
| CN101659450A CN101659450A (en) | 2010-03-03 |
| CN101659450B true CN101659450B (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810012997 Expired - Fee Related CN101659450B (en) | 2008-08-28 | 2008-08-28 | Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103101939A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Method for decreasing heat exchange area needed by dissolution system |
| CN105271326A (en) * | 2014-06-27 | 2016-01-27 | 沈阳铝镁设计研究院有限公司 | Method for improving water-return ratio of primary water in evaporation system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280100A (en) * | 2000-07-26 | 2001-01-17 | 平果铝业公司 | Directly heating and decomposing plate heat exchanging technology for alumina laterite washing |
| RU2256614C2 (en) * | 2003-10-16 | 2005-07-20 | Открытое акционерное общество "Сибирско-Уральская алюминиевая компания" | Bauxite leaching process |
| CN101067538A (en) * | 2007-06-05 | 2007-11-07 | 沈阳铝镁设计研究院 | Steam condensed water waste heat utilizing method and equipment |
| CN201065329Y (en) * | 2007-07-03 | 2008-05-28 | 沈阳铝镁设计研究院 | Steam condensed water residual heat utilizing device |
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2008
- 2008-08-28 CN CN 200810012997 patent/CN101659450B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280100A (en) * | 2000-07-26 | 2001-01-17 | 平果铝业公司 | Directly heating and decomposing plate heat exchanging technology for alumina laterite washing |
| RU2256614C2 (en) * | 2003-10-16 | 2005-07-20 | Открытое акционерное общество "Сибирско-Уральская алюминиевая компания" | Bauxite leaching process |
| CN101067538A (en) * | 2007-06-05 | 2007-11-07 | 沈阳铝镁设计研究院 | Steam condensed water waste heat utilizing method and equipment |
| CN201065329Y (en) * | 2007-07-03 | 2008-05-28 | 沈阳铝镁设计研究院 | Steam condensed water residual heat utilizing device |
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| CN101659450A (en) | 2010-03-03 |
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