CN105485656A - Process method for recovering heat energy of backflow waste heat from aluminum oxide autoclave digestion process - Google Patents
Process method for recovering heat energy of backflow waste heat from aluminum oxide autoclave digestion process Download PDFInfo
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- CN105485656A CN105485656A CN201410473252.6A CN201410473252A CN105485656A CN 105485656 A CN105485656 A CN 105485656A CN 201410473252 A CN201410473252 A CN 201410473252A CN 105485656 A CN105485656 A CN 105485656A
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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a process method for recovering heat energy of backflow waste heat from aluminum oxide autoclave digestion process.Two-stage heat exchangers are arranged in a hot water station. A first-stage heat exchanger is a water-water heat exchanger. A second-stage heat exchanger is a gas-water heat exchanger. The first-stage heat exchanger, as the water-water heat exchanger, is used for recovering backflow waste heat of the process and heating cold water. The second-stage heat exchanger, as the gas-water heat exchanger, serves as an auxiliary spare heat exchanger. The process method for recovering heat energy of backflow waste heat from aluminum oxide autoclave digestion process has following beneficial effects: (1) a reasonable method is utilized for process backflow temperature of the autoclave digestion process in order to be favorable to cyclic utilization and heat energy of waste heat produced by backflow and temperature reduction is recovered; (2) steam consumption of the hot water station used for heating hot water is reduced and operation cost is saved; (3) a system is easy and is convenient to apply, operate and maintain.
Description
Technical field
The present invention relates to a kind of process reclaiming aluminium oxide autoclave digestion technique backwater waste heat heat energy.
Background technology
In aluminum oxide production process, autoclave digestion technique adopts the heat source of saturated vapor as system of certain parameter usually, in this process steam heat exchange workshop section, main what utilize is that the latent heat of steam carrys out heated material, and the steam condensate namely after heat exchange is the saturation water of this pressure.For certain project, it adopts saturated vapour pressure to be 6.4MPa, and the coagulation hydroenergy backwater temperature of its correspondence is 280 DEG C.
At present, be three grades of detections of backwater to the main way of technique backwater recovery, when namely technique backwater meets boiler feedwater quality requirement after testing, be directly fed to the feed water system of boiler and use; When technique backwater does not meet boiler feedwater quality requirement after testing, after mixed bed process between Water Treatment, then send into the feed water system of boiler and use; When technique backwater is subject to polluting after testing, directly enter industry water drainage system in factory.
But, present stage is that the self-owned power plant boiler water supply system oxygen-eliminating device inflow temperature of the supporting setting of alumina producing is the highest no more than 158 DEG C, between Water Treatment, mixed bed inflow temperature may not exceed 60 DEG C, and in factory, the temperature at discharging condensate of industry water drainage pipeline networks requires general also no more than 80 DEG C.Therefore, no matter autoclave digestion technique backwater is in the processing mode in which stage, and all need the process through cooling, this partial heat is usually wasted or is not reasonably utilized.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of process reclaiming aluminium oxide autoclave digestion technique backwater waste heat heat energy, object effectively reclaims and utilize autoclave digestion technique backwater waste heat heat energy, reduces the steam consumption that aluminum oxide industry is produced, and saves operating cost.
To achieve these goals, the present invention is achieved by the following technical solution.
Reclaim a process for autoclave digestion technique backwater waste heat heat energy, in hot water station, arrange two-stage heat exchanger, i.e. first-class heat exchanger and secondary heat exchanger, described secondary heat exchanger arranges bypass bypath system; Concrete technology is: first detect backwater, then according to following method process:
(1) when autoclave digestion backwater after testing, when meeting boiler feedwater quality requirement, need return water temperature to be down to 150 DEG C, now, if utilize separately first-class heat exchanger heat hot water cannot meet the hot water demand of technique, then open secondary heat exchanger auxiliary heating;
(2) when autoclave digestion backwater after testing, when needing to meet boiler feedwater quality requirement between Water Treatment after mixed bed process, need return water temperature to be down to less than 60 DEG C, now, utilize separately first-class heat exchanger heat hot water;
(3) when autoclave digestion backwater after testing, can not as boiler feedwater time, arrange the temperature of backwater according to hot water supply load in hot water station, typical temperature can be down to less than 60 DEG C, now, utilizes separately first-class heat exchanger heat hot water;
Autoclave digestion backwater after heat exchange enters industrial circulating water system, as circulating cooling make-up water.
Described first-class heat exchanger is water-water heat exchanger.
Described secondary heat exchanger is steam water heat exchanger, as auxiliary standby heat exchanger.
Effective recovered temperature is the waste heat heat energy of the saturation process backwater of 180 ~ 300 DEG C, reduces the alumina producer hot water station steam consumption.
Accompanying drawing explanation
Fig. 1 is the process chart reclaiming autoclave digestion technique backwater waste heat heat energy.
In figure: 1, one-level water-water heat exchanger; 2, secondary steam water heat exchanger; 3, bypath system; 4, autoclave digestion backwater; 5, low-pressure steam; 6, low-pressure steam condensate water; 7, cold water; 8, hot water.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
In hot water station, arrange two-stage heat exchanger, first-class heat exchanger is water-water heat exchanger, and secondary heat exchanger is steam water heat exchanger.When actual motion, when autoclave digestion backwater after testing, when meeting boiler feedwater quality requirement, return water temperature is needed to be down to 150 DEG C, now, utilize separately first-class heat exchanger heat hot water possibly cannot meet the hot water demand of technique, need to open secondary heat exchanger auxiliary heating, therefore need to consume a small amount of low-pressure steam.When autoclave digestion backwater after testing, when needing to meet boiler feedwater quality requirement between Water Treatment after mixed bed process, return water temperature is needed to be down to less than 60 DEG C, now, utilize separately first-class heat exchanger heat hot water can meet the hot water demand of technique, without the need to opening secondary heat exchanger, therefore without steam consumption.When autoclave digestion backwater after testing, can not as boiler feedwater time, arrange the temperature of backwater according to hot water supply load in hot water station, typical temperature can be down to less than 60 DEG C, autoclave digestion backwater after heat exchange enters full factory industrial circulating water system, as factory's Inner eycle water moisturizing.The present invention adopts the water-water heat exchanger being applicable to high-temperature water heating, is applicable to the saturation water that temperature is 180 ~ 300 DEG C.
First-class heat exchanger of the present invention is adopted as water-water heat exchanger, and secondary heat exchanger is steam water heat exchanger, as auxiliary standby heat exchanger.The advantage of this set is: in aluminum oxide production process, autoclave digestion technique adopts the heat source of saturated vapor as system of certain parameter usually, in this process steam heat exchange workshop section, main utilization be that the latent heat of steam carrys out heated material, the steam condensate namely after heat exchange is the saturation water of this pressure.For certain project, it adopts saturated vapour pressure to be 6.4MPa, and the coagulation hydroenergy backwater temperature of its correspondence is 280 DEG C.Therefore, the present invention mainly reclaims the heat energy of coagulation hydroenergy backwater with first-class heat exchanger.Only have when return water temperature requirement is down to 150 DEG C, now, heat transfer temperature difference is less, when cannot meet the requirement of heating cold water, just enables secondary heat exchanger, now, needs to consume a small amount of low-pressure steam.
Claims (4)
1. reclaim a process for autoclave digestion technique backwater waste heat heat energy, it is characterized in that: in hot water station, arrange two-stage heat exchanger, i.e. first-class heat exchanger and secondary heat exchanger, described secondary heat exchanger arranges bypass bypath system; Concrete technology is: first detect backwater, then according to following method process:
(1) when autoclave digestion backwater after testing, when meeting boiler feedwater quality requirement, need return water temperature to be down to 150 DEG C, now, if utilize separately first-class heat exchanger heat hot water cannot meet the hot water demand of technique, then open secondary heat exchanger auxiliary heating;
(2) when autoclave digestion backwater after testing, when needing to meet boiler feedwater quality requirement between Water Treatment after mixed bed process, need return water temperature to be down to less than 60 DEG C, now, utilize separately first-class heat exchanger heat hot water;
(3) when autoclave digestion backwater after testing, can not as boiler feedwater time, arrange the temperature of backwater according to hot water supply load in hot water station, typical temperature can be down to less than 60 DEG C, now, utilizes separately first-class heat exchanger heat hot water;
Autoclave digestion backwater after heat exchange enters industrial circulating water system, as circulating cooling make-up water.
2. method according to claim 1, is characterized in that: described first-class heat exchanger is water-water heat exchanger.
3. method according to claim 1, is characterized in that: secondary heat exchanger is steam water heat exchanger, as auxiliary standby heat exchanger.
4. method according to claim 1, is characterized in that: effectively recovered temperature is the waste heat heat energy of the saturation process backwater of 180 ~ 300 DEG C, reduces the alumina producer hot water station steam consumption.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410473252.6A CN105485656B (en) | 2014-09-16 | 2014-09-16 | A kind of process for recycling aluminium oxide autoclave digestion technique return water waste heat thermal energy |
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| CN201410473252.6A CN105485656B (en) | 2014-09-16 | 2014-09-16 | A kind of process for recycling aluminium oxide autoclave digestion technique return water waste heat thermal energy |
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| CN105485656A true CN105485656A (en) | 2016-04-13 |
| CN105485656B CN105485656B (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728638A (en) * | 2018-09-12 | 2018-11-02 | 江钨世泰科钨品有限公司 | A kind of utilization method and system of Tungsten smelting autoclaving process waste heat |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101619662A (en) * | 2009-08-14 | 2010-01-06 | 清华大学 | Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way |
| CN201628490U (en) * | 2010-04-19 | 2010-11-10 | 山东中烟工业公司 | Leveled utilization device for cigarette factory steam condensed water heat |
| CN102230690A (en) * | 2011-07-05 | 2011-11-02 | 林昌元 | Solar-powered heat pump unit capable of freely recovering excess heat |
| CN202581503U (en) * | 2012-03-09 | 2012-12-05 | 上海理工大学 | Steam condensate water waste heat recovery device |
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- 2014-09-16 CN CN201410473252.6A patent/CN105485656B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619662A (en) * | 2009-08-14 | 2010-01-06 | 清华大学 | Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way |
| CN201628490U (en) * | 2010-04-19 | 2010-11-10 | 山东中烟工业公司 | Leveled utilization device for cigarette factory steam condensed water heat |
| CN102230690A (en) * | 2011-07-05 | 2011-11-02 | 林昌元 | Solar-powered heat pump unit capable of freely recovering excess heat |
| CN202581503U (en) * | 2012-03-09 | 2012-12-05 | 上海理工大学 | Steam condensate water waste heat recovery device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728638A (en) * | 2018-09-12 | 2018-11-02 | 江钨世泰科钨品有限公司 | A kind of utilization method and system of Tungsten smelting autoclaving process waste heat |
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| CN105485656B (en) | 2018-07-10 |
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