CN103101939A - Method for decreasing heat exchange area needed by dissolution system - Google Patents
Method for decreasing heat exchange area needed by dissolution system Download PDFInfo
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- CN103101939A CN103101939A CN201110358837XA CN201110358837A CN103101939A CN 103101939 A CN103101939 A CN 103101939A CN 201110358837X A CN201110358837X A CN 201110358837XA CN 201110358837 A CN201110358837 A CN 201110358837A CN 103101939 A CN103101939 A CN 103101939A
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Abstract
The invention relates to a method for decreasing heat exchange area needed by a dissolution system through changing a dissolution method in alumina production and belongs to the technical field of the alumina production. The method comprises the following steps of: converging all the water used for washing red mud into a washing water heater arranged in a dissolution process; heating with secondary vapor of a final-stage slurry self-evaporating device and a final-stage condensate self-evaporating device of the dissolution; and adjusting the amount of secondary vapor by changing the material feed and discharge temperature of the previous self-evaporating devices and the final-stage slurry self-evaporating device so that the amount of the secondary vapor of the final-stage self-evaporating device is enough to heat the red mud washing water to the temperature needed for the washing. The method has the advantages and effects as follows: the amount of the secondary vapor of the previous self-evaporating devices is decreased, so the temperature of the secondary vapor is increased, and the sleeve heat exchange area needed for preheating the slurry is greatly decreased; and the flow rate of low-temperature secondary vapor is higher than that of high-temperature secondary vapor, so the amount of the self-evaporated secondary vapor is transferred to a low-temperature zone to decrease specifications of the self-evaporating device needed for the self evaporation.
Description
Technical field
The present invention relates to a kind of dissolving-out method that passes through to change in alumina producing, reduce the method for the required heat interchanging area of digestion series, belong to technical field of alumina production.
Background technology
Stripping operation in alumina producing, after after pre-desiliconizing, ore pulp and alkali lye mix and send into digestion series by the stripping fresh feed pump, usually adopt the preheating of multiple stage secondary steam jacket, the live steam sleeve pipe is heated to the stripping temperature, digester stops stripping, the self-evaporatint n. cooling step by step of multistage flash evaporation groove, the red mud separation circuit is sent in the discharging of final stage flash-pot, and final stage flash-pot secondary steam goes the flow process of wash water heater heats red mud wash water.
red mud wash water in alumina producing is mainly used in washing red mud, its source mainly comprises digestion series secondary vapour water of condensation, final stage flash-pot secondary vapour, final stage condensate water self-evaporating device secondary vapour, the red mud dump backwater, and the defective water of condensation of evaporization process, water etc. under the vaporize water cooler, the final stage flash-pot secondary vapour of wherein stripping operation need to absorb with the water of low temperature, to reclaim heat, and avoid thermal pollution, water everywhere converges at the hot water tank place of red mud separating, washing operation, use as the red mud wash water, do not reach the washing needs as temperature, passing into live steam is heated to temperature required.
Present stripping process selecting is used for the slip preheating with the self-evaporating secondary vapour of slip as far as possible at this in-process, the Btu utilization maximum is turned to principle, reduces the consumption of live steam.The final stage self-evaporatint n. secondary vapour of low parameter is used for heating red mud wash water, comes the amount of red mud wash water of stripping being absorbed as final stage secondary vapour suitable fully.The remainder of the required red mud wash water of system is directly sent the hot water tank of washing operation to laundry, without stripping operation wash water well heater.Above flow process has also been brought the problems such as the required heat interchanging area of stripping preheating is excessive when having reduced digestion series live steam consumption.
Summary of the invention
The present invention is exactly a kind of method that reduces the required heat interchanging area of digestion series that provides in order to solve the problems of the technologies described above, and purpose is in order to reduce the required sleeve heat exchange area of stripping operation slip preheating.
in order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions: the method that reduces the required heat interchanging area of digestion series, comprise the steps: that the required water everywhere of laterite washing all converges to the wash water well heater that is located at the stripping operation, adopt the secondary vapour heating of stripping final stage slip flash-pot and final stage condensate water self-evaporating device, the amount of secondary vapour is regulated by the input and output material temperature of what flash-pot before changing and final stage slip flash-pot, make the amount of final stage flash-pot secondary steam all red mud wash waters can be heated to the required temperature of washing.
The secondary vapour water of condensation of final stage condensate water self-evaporating device is delivered to the wash water well heater, jointly is heated to the required water everywhere of laterite washing in the wash water well heater with the secondary steam of final stage slip flash-pot and final stage condensate water self-evaporating device.
Go the secondary steam of wash water well heater just all red mud wash waters can be heated to the required temperature of washing.
After heating, qualified red mud wash water is delivered to the hot water tank that is located at the laterite washing operation in the wash water well heater, for the washing red mud.
Reduce the method for the required heat interchanging area of digestion series, before also comprising, what flash-pot flash distillation secondary steam out removes preheating low temperature stripping slurry.
Advantage of the present invention and effect are as follows:
Secondary vapour amount due to what flash-pot before having reduced has improved the secondary stripping temperature, has greatly reduced the required sleeve heat exchange area of slip preheating; Although the live steam consumption of this operation increases to some extent, consider together if will originally be used for the live steam of washing procedure heating red mud wash water, use the present invention before and after the live steam total amount consumed substantially suitable, live steam heating muff area is very nearly the same; Because low temperature secondary steam flow velocity is greater than high temperature secondary steam, by self-evaporatint n. secondary steam amount is shifted to low-temperature region, reduced the needed flash-pot specification of self-evaporatint n..
To produce the low temperature Bayer process alumina producer of 650,000 tons per year as example:
1, can reduce secondary steam for preheating sleeve pipe area approximately 47% by present method.
2, live steam consumption and existing procedure stripping are suitable with washing procedure live steam consumption sum, do not increase live steam consumption.
3, after use present method, digestion series self-evaporatint n. secondary vapour total amount is substantially constant, and first step self-evaporatint n. secondary steam amount reduces, and final stage self-evaporatint n. secondary steam amount increases, and the flash-pot specification reduces to some extent.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
In figure: 1, front what flash-pot; 2, final stage slip flash-pot; 3, final stage condensate water self-evaporating device; 4, wash water well heater; 5, hot water tank; 6, secondary steam; 7, secondary steam; 8, secondary steam; 9, secondary vapour water of condensation; 10, water everywhere; 11 red mud wash waters.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing, but protection scope of the present invention is not limit by embodiment.
As shown in Figure 1, the present invention reduces the method for the required heat interchanging area of digestion series, comprise the steps: that the required water everywhere 10 of laterite washing all converges to the wash water well heater 4 that is located at the stripping operation, adopt the secondary vapour heating of stripping final stage slip flash-pot 2 and final stage condensate water self-evaporating device 3, the amount of secondary vapour is regulated by the input and output material temperature of what flash-pot 1 before changing and final stage slip flash-pot 2, and the amount that makes final stage slip flash-pot 2 produce secondary steam can be heated to all red mud wash waters 11 the required temperature of washing; The secondary vapour water of condensation 9 of final stage condensate water self-evaporating device 3 is delivered to wash water well heater 4, jointly heats the required water everywhere 10 of laterite washing in wash water well heater 4 with the secondary steam (7,8) of final stage slip flash-pot 2 and final stage condensate water self-evaporating device 4; After heating, qualified red mud wash water 11 is delivered to the hot water tank 5 that is located at the laterite washing operation in wash water well heater 4, for the washing red mud; Front what flash-pot 1 flash distillation secondary steam 6 out removes preheating low temperature stripping slurry.
Claims (5)
1., reduce the method for the required heat interchanging area of digestion series, it is characterized in that comprising the steps: that the required water everywhere of laterite washing all converges to the wash water well heater that is located at the stripping operation, adopt the secondary vapour heating of stripping final stage slip flash-pot and final stage condensate water self-evaporating device, the amount of secondary vapour is regulated by the input and output material temperature of what flash-pot before changing and final stage slip flash-pot, makes the amount of final stage flash-pot secondary steam all red mud wash waters can be heated to the required temperature of washing.
2. the method for the required heat interchanging area of minimizing digestion series according to claim 1, the secondary vapour water of condensation that it is characterized in that final stage condensate water self-evaporating device is delivered to the wash water well heater, jointly is heated to the required water everywhere of laterite washing in the wash water well heater with the secondary steam of final stage slip flash-pot and final stage condensate water self-evaporating device.
3. the method for the required heat interchanging area of minimizing digestion series according to claim 1, is characterized in that the secondary steam of wash water well heater can be heated to all red mud wash waters the required temperature of washing just.
4. the method for the required heat interchanging area of minimizing digestion series according to claim 1, is characterized in that the rear qualified red mud wash water of heating is delivered to the hot water tank that is located at the laterite washing operation in the wash water well heater, for the washing red mud.
5. the method for the required heat interchanging area of minimizing digestion series according to claim 1, is characterized in that what flash-pot flash distillation secondary steam out removes preheating low temperature stripping slurry before also comprising.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110358837XA CN103101939A (en) | 2011-11-14 | 2011-11-14 | Method for decreasing heat exchange area needed by dissolution system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110358837XA CN103101939A (en) | 2011-11-14 | 2011-11-14 | Method for decreasing heat exchange area needed by dissolution system |
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| CN103101939A true CN103101939A (en) | 2013-05-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575107A (en) * | 2008-05-08 | 2009-11-11 | 沈阳铝镁设计研究院 | Respective self-evaporation technology of new steam condensate and secondary steam condensate |
| CN101659450A (en) * | 2008-08-28 | 2010-03-03 | 中铝国际技术发展有限公司 | Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate |
| CN101671042A (en) * | 2008-09-09 | 2010-03-17 | 中铝国际技术发展有限公司 | Alumina melting method |
| CN101825360A (en) * | 2010-05-10 | 2010-09-08 | 贵阳铝镁设计研究院 | Method and device for recycling high-pressure dissolved steam exhaust of diluting tank in alumina production |
-
2011
- 2011-11-14 CN CN201110358837XA patent/CN103101939A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575107A (en) * | 2008-05-08 | 2009-11-11 | 沈阳铝镁设计研究院 | Respective self-evaporation technology of new steam condensate and secondary steam condensate |
| CN101659450A (en) * | 2008-08-28 | 2010-03-03 | 中铝国际技术发展有限公司 | Process for combined spontaneous evaporation of new steam condensate and secondary steam condensate |
| CN101671042A (en) * | 2008-09-09 | 2010-03-17 | 中铝国际技术发展有限公司 | Alumina melting method |
| CN101825360A (en) * | 2010-05-10 | 2010-09-08 | 贵阳铝镁设计研究院 | Method and device for recycling high-pressure dissolved steam exhaust of diluting tank in alumina production |
Non-Patent Citations (1)
| Title |
|---|
| 邹若飞等: ""高压溶出稀释槽乏汽利用的改进措施"", 《有色冶金节能》, vol. 21, no. 10, 31 October 2004 (2004-10-31), pages 85 - 86 * |
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Application publication date: 20130515 |