CN102234122A - Method for using steam to supply heat for pipeline digestion and apparatus thereof - Google Patents
Method for using steam to supply heat for pipeline digestion and apparatus thereof Download PDFInfo
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- CN102234122A CN102234122A CN2010101541016A CN201010154101A CN102234122A CN 102234122 A CN102234122 A CN 102234122A CN 2010101541016 A CN2010101541016 A CN 2010101541016A CN 201010154101 A CN201010154101 A CN 201010154101A CN 102234122 A CN102234122 A CN 102234122A
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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
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Abstract
The invention discloses a method for using steam to supply heat for pipeline digestion and an apparatus thereof. In the method, high pressure steam with a temperature of more than 290 DEG C is used as a heating medium of a pipeline digestion apparatus to substitute present fuel oil heating medium and molten salt heating medium, thus heat efficiency is raised and environmental pollution of the fuel oil and the molten salt is reduced. Compared with a molten salt furnace, an operation ratio of the apparatus provided in the invention is raised by 5% or more, a heat consumption rate of the apparatus is reduced by about 30%, and digestion of alumina of bauxite of the apparatus is raised by 1-2%. In the invention, the high pressure steam generated by a coal dust boiler with thermal efficiency being equal to or larger than 90% is adopted as heat supply of the pipeline digestion, thus thermal efficiency of the boiler is raised by 25% compared with a coal burning molten salt furnace, and the boiler has the advantages of stationary heat supply, high reliability and security, simple operation, reduction of maintenance and reparation workload and energy saving. According to the invention, the fuel oil and molten salt are substituted by the steam in heat supply, pollution of the fuel oil and molten salt to environment is eliminated, and working environment and health condition are improved.
Description
Technical field
The present invention relates to a kind of heat supply method and device, relate to particularly that a kind of to adopt steam in alumina producing be the mode and the device of canalization stripping heat supply.
Background technology
Stripping is very important operation in the alumina producing, and it is directly connected to the quality of total yield and factory's technico-economical comparison of aluminum oxide in the bauxite.Therefore diaspore will adopt high temperature (being generally 245 ~ 280 ℃) and higher caustic sodium concentration (circulating mother liquor NK:180 ~ 290g/l) could obtain result of extraction preferably than gibbsite and boehmite indissoluble.Canalization is a kind of method of dissolving-out process, and this method is except being convenient to realize high temperature (260 ~ 280 ℃) and shortening the alkali concn (circulating mother liquor NK can reduce to about 180g/l) that can also suitably reduce stripping stripping heat-up time.
The canalization dissolving-out process adopts coal, fuel oil and Sweet natural gas heat supply more at present, the fuel price costliness causes production cost higher, Sweet natural gas has only when alumina producer is located in hot gas producing region, abundant sky (how China's alumina producer does not have this condition) can consider to adopt, otherwise causes the production cost height equally; With of the heat supply of coal heating fused salt as canalization, its molten salt furnace is a chain furnace grate, thermo-efficiency low (only about 65%), in addition, the heat capacity of separate unit molten salt furnace is less, and fault is higher, and maintenance load is bigger, cause the operation factor of digestion series low therefrom (about 85%) in addition, fused salt is a kind of material that is an impediment to person health.
Summary of the invention
The objective of the invention is to, it is the method and the device of canalization stripping heat supply that a kind of steam that adopts is provided.Can reduce production costs, improve thermo-efficiency and heat capacity, reduce failure rate and maintenance load, the operation factor that improves equipment improves workman's Working environment.
Technical scheme of the present invention: a kind of steam that adopts is the method for canalization stripping heat supply, the high pressure steam of this method employing more than 290 ℃ is as the heating medium of canalization dissolving out apparatus, substitute existing fuel Heating medium and fused salt heating medium, to improve thermo-efficiency, reduce the pollution of the environment of fuel oil and fused salt.
Above-mentioned employing steam is in the method for canalization stripping heat supply, the high-temperature condensation water that produces after the heat exchange in described canalization dissolving out apparatus is sent into flash tank through the ore pulp heating of double evaporation-cooling as the lower temperature section, the comparatively high temps water of condensation that double evaporation-cooling produces returns boiler, can reduce heat-up time, reach further purpose of energy saving.
Aforementioned employing steam is in the method for canalization stripping heat supply, and described boiler adopts the pulverized coal firing boiler of thermo-efficiency 〉=90%.
Aforementioned employing steam is the used device of method of canalization stripping heat supply, comprises canalization dissolving out apparatus, pipe and outer tube in canalization dissolving out apparatus comprises; In the pipe two ends respectively with raw pulp pipeline and stripping pipe connection, it is characterized in that: be respectively equipped with steam inlet and condensation-water drain on the outer tube, steam inlet is connected with steam-pipe, condensation-water drain is connected through the inlet of condensing water conduit with the water of condensation holding tank, the outlet of coagulating water collecting tank is connected with flash tank through condensing water conduit, the secondary steam that the flash tank double evaporation-cooling produces is connected with low-temperature heating device through secondary steam pipe, and the water of condensation that flash tank produces is sent boiler back to through the time condensation water pipe and reheated the generation live steam.
Compared with prior art, the present invention compares operation factor and can improve more than 5% with molten salt furnace; Hear rate can reduce about 30%; The stripping of aluminum oxide improves 1-2% in the bauxite.Because the high pressure steam that the pulverized coal firing boiler of employing thermo-efficiency 〉=90% produces is as the heat supply of canalization stripping, the thermo-efficiency of boiler has not only improved more than 25% than burning the coal molten salt furnace, and heat supply is steady, and reliability and security are better, easy and simple to handle, the Maintenance and Repair workload reduces.The present invention substitutes fuel oil and fused salt heat supply with steam and has eliminated fuel oil and fused salt the pollution of environment has been improved Working environment and sanitary condition, has protected effectively that the workman's is healthy.The high-temperature condensation water heat that produces after the heat exchange of the present invention is also recycling, save energy.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention;
Fig. 2 is the synoptic diagram of canalization dissolving out apparatus.
Being labeled as in the accompanying drawing: pipe in the 1-outer tube, 2-, 3-raw pulp pipeline, 4-stripping pipeline, the 5-steam-pipe, the 6-condensing water conduit, 7-coagulates water collecting tank, 8-flash tank, 9-secondary steam pipe, 10-time condensation water pipe.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment.The present invention as shown in Figure 1, a kind of steam that adopts is the method for canalization stripping heat supply, the high pressure steam of this method employing more than 290 ℃ is as the heating medium of canalization dissolving out apparatus, substitute existing fuel Heating medium and fused salt heating medium, to improve thermo-efficiency, reduce the pollution of the environment of fuel oil and fused salt.This example is to be that 310 ℃ high temperature and high pressure steam is 88 ℃ to temperature with temperature, and flow is that the raw pulp of 8.7m3/tAl2O3 heats.The steam consumption of process in leaching unit product is 1.6 t/tAl2O3, and the steam consumption of then every m3 ore pulp is 0.184t.The high-temperature condensation water that produces after the heat exchange in described canalization dissolving out apparatus is sent into flash tank through the ore pulp heating of double evaporation-cooling as the lower temperature section, the comparatively high temps water of condensation that double evaporation-cooling produces returns boiler, can reduce heat-up time, reach further purpose of energy saving.Described boiler adopts the pulverized coal firing boiler of thermo-efficiency 〉=90%.
Above-mentioned employing steam is the used device of method of canalization stripping heat supply, comprises canalization dissolving out apparatus, pipe 2 and outer tube 1 in canalization dissolving out apparatus comprises; Outer tube 1 has one, can have in the outer tube 1 and manage 2 in many, and shown in Figure 2 is the synoptic diagram that 4 interior pipes are arranged in the outer tube.Pipe 2 two ends are connected with stripping pipeline 4 with raw pulp pipeline 3 respectively in every, be respectively equipped with steam inlet and condensation-water drain on the outer tube 1, steam inlet is connected with steam-pipe 5, condensation-water drain is connected through the inlet of condensing water conduit 6 with water of condensation holding tank 7, the outlet of coagulating water collecting tank 7 is connected with flash tank 8 through condensing water conduit 6, the secondary steam that flash tank 8 double evaporation-coolings produce is connected with low-temperature heating device through secondary steam pipe 9, and the water of condensation that flash tank 8 produces is sent boiler back to through time condensation water pipe 10 and reheated the generation live steam.
Claims (4)
- One kind to adopt steam be the method for canalization stripping heat supply, it is characterized in that: the high pressure steam of this method employing more than 290 ℃ is as the heating medium of canalization dissolving out apparatus, substitute existing fuel Heating medium and fused salt heating medium, to improve thermo-efficiency, reduce the pollution of the environment of fuel oil and fused salt.
- 2. the method that is canalization stripping heat supply according to the described employing steam of claim 1, it is characterized in that: the high-temperature condensation water that produces after the heat exchange in described canalization dissolving out apparatus is sent into flash tank through the ore pulp heating of double evaporation-cooling as the lower temperature section, the comparatively high temps water of condensation that double evaporation-cooling produces returns boiler, can reduce heat-up time, reach further purpose of energy saving.
- 3. the method that is canalization stripping heat supply according to the described employing steam of claim 2 is characterized in that: the pulverized coal firing boiler of described boiler employing thermo-efficiency 〉=90%.
- One kind to adopt steam be the device of canalization stripping heat supply, comprise canalization dissolving out apparatus, canalization dissolving out apparatus comprises interior pipe (2) and outer tube (1); Interior pipe (2) two ends are connected with stripping pipeline (4) with raw pulp pipeline (3) respectively, it is characterized in that: outer tube is respectively equipped with steam inlet and condensation-water drain on (1), steam inlet is connected with steam-pipe (5), condensation-water drain is connected through the inlet of condensing water conduit (6) with water of condensation holding tank (7), the outlet of coagulating water collecting tank (7) is connected with flash tank (8) through condensing water conduit (6), the secondary steam that flash tank (8) double evaporation-cooling produces is connected with low-temperature heating device through secondary steam pipe (9), and the water of condensation that flash tank (8) produces is sent boiler back to through time condensation water pipe (10) and reheated the generation live steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101541016A CN102234122A (en) | 2010-04-23 | 2010-04-23 | Method for using steam to supply heat for pipeline digestion and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101541016A CN102234122A (en) | 2010-04-23 | 2010-04-23 | Method for using steam to supply heat for pipeline digestion and apparatus thereof |
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| CN102234122A true CN102234122A (en) | 2011-11-09 |
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| CN2010101541016A Pending CN102234122A (en) | 2010-04-23 | 2010-04-23 | Method for using steam to supply heat for pipeline digestion and apparatus thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103159239A (en) * | 2011-12-08 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Heating method and apparatus of alumina dissolution sleeve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597524A (en) * | 2004-07-23 | 2005-03-23 | 山东铝业股份有限公司 | Bauxite low temperature continuous dissolving out technology |
| CN2861934Y (en) * | 2005-12-24 | 2007-01-24 | 张学信 | Improved pipeline heater |
| CN101264912A (en) * | 2007-03-14 | 2008-09-17 | 贵阳铝镁设计研究院 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
| CN101462747A (en) * | 2007-12-18 | 2009-06-24 | 沈阳铝镁设计研究院 | High pressure digestion apparatus |
| 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 |
| CN201686499U (en) * | 2010-04-23 | 2010-12-29 | 贵阳铝镁设计研究院 | Steam-employed tube digestion heating device |
-
2010
- 2010-04-23 CN CN2010101541016A patent/CN102234122A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597524A (en) * | 2004-07-23 | 2005-03-23 | 山东铝业股份有限公司 | Bauxite low temperature continuous dissolving out technology |
| CN2861934Y (en) * | 2005-12-24 | 2007-01-24 | 张学信 | Improved pipeline heater |
| CN101264912A (en) * | 2007-03-14 | 2008-09-17 | 贵阳铝镁设计研究院 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
| CN101462747A (en) * | 2007-12-18 | 2009-06-24 | 沈阳铝镁设计研究院 | High pressure digestion apparatus |
| 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 |
| CN201686499U (en) * | 2010-04-23 | 2010-12-29 | 贵阳铝镁设计研究院 | Steam-employed tube digestion heating device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103159239A (en) * | 2011-12-08 | 2013-06-19 | 贵阳铝镁设计研究院有限公司 | Heating method and apparatus of alumina dissolution sleeve |
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Application publication date: 20111109 |