CN101870492B - New technology for gas suspension calcination of aluminium hydroxide - Google Patents
New technology for gas suspension calcination of aluminium hydroxide Download PDFInfo
- Publication number
- CN101870492B CN101870492B CN2010102317535A CN201010231753A CN101870492B CN 101870492 B CN101870492 B CN 101870492B CN 2010102317535 A CN2010102317535 A CN 2010102317535A CN 201010231753 A CN201010231753 A CN 201010231753A CN 101870492 B CN101870492 B CN 101870492B
- Authority
- CN
- China
- Prior art keywords
- aluminium hydroxide
- waste heat
- steam
- heat boiler
- preheating
- 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.)
- Active
Links
Images
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
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a new technology for gas suspension calcination of aluminium hydroxide, successively comprising the following steps: feeding, entering a Venturi flash drier, entering a multi-stage preheating drier, entering an aluminium hydroxide roaster, entering a thermal separation cyclone, and entering a cooling mechanism to obtain the finished product aluminium hydroxide. A preheating drier is connected with a pipeline leading to the flash drier, and the cyclone is connected with a pipeline leading to the preheating drier. The new technology is characterized in that the system also comprises a waste heat boiler and a humidifying rotational flow dust collector, wherein the cooler is connected with a pipeline leading to the waste heat boiler; the waste heat boiler is connected with a pipeline leading to the roaster; the roaster is connected with a moisture pipeline leading to the humidifying rotational flow dust collector; and steam from the humidifying rotational flow dust collector and the boiler can serve as a new steam source to be used by an evaporation tool. The invention is characterized in that the invention not only preheats air but also produces steam with high additional value on the utilization of waste heat, provides a valuable evaporation heat source for producing aluminium hydroxide, recovers moisture produced in the roasting process, converts moisture into new steam and greatly lowers production operation cost.
Description
Technical field
The invention belongs to the gas suspension calcination of aluminium hydroxide technical field; Relate to a kind of new technology for gas suspension calcination of aluminium hydroxide specifically; This technology is mainly used in the roasting workshop section of alumina producing enterprise, also can be applicable to the roasting of industries such as metallurgy, chemical industry, building materials or dehydrates process.
Background technology
The purpose of Aluminium hydroxide roasting is to slough attached water and the crystal water (amounting to about 43%) that white lake contains, and changes crystal formation, produces the technological process of satisfactory aluminum oxide.It is last procedure in the aluminum oxide production process, and its energy consumption accounts for 23% of alumina technology energy consumption.Aluminium hydroxide roasting is the important step of decision aluminum oxide output, quality and energy consumption, and people are studying always and improving theory, Technology and the equipment of Aluminium hydroxide roasting process.At present, Aluminium hydroxide roasting generally adopts gas suspension calcination technology, and calcining process is all having bigger improvement aspect energy-conservation and the flow process than before.
The representative type of furnace of gas suspension calcination technology is the gas suspension calcination stove of F.L.Smith, and the process statistics energy consumption is 3.075GJ/T.China's aluminum oxide industry extensively adopts the gas suspension calcination stove sinter process of F.L.Smith.Even so, also having many deficiencies, mainly is aspect effectively the utilizing of the energy.The problem that existing roasting system exists is not a technical reason, but historical reasons.Energy prices were lower at that time, and its technological design is to be center theory unfolded design to improve production capacity, to practice thrift investment in principle, and the now energy prices have risen four, five times, reduce working cost and just become primary design concept naturally.Be the operational path of theory with energy-conservation and be that the operational path of theory is distinct that the energy-conservation economic benefit of enterprises that not only is related to also is related to the Sustainable development of society with production capacity or investment.
The deficiency that the system of existing stoving oven sinter process forms and exists:
1, system forms (referring to Fig. 1)
The gas suspension calcination of aluminium hydroxide furnace system mainly comprises: white lake feeding machine, Venturi flash dryer, multistage cyclone pre-heating system, multistage cyclone water cooler, fluidized bed cooler, dedusting and return parts such as ash.
2, the deficiency that exists
The main task of gas suspension calcination process is to remove the contained crystal water of white lake.Dehydration needs heat energy, and after white lake was heated, crystal water became the steam alumina body of escaping and accomplishes dehydration.Existing heating process adopts the direct heating mode, though direct heating mode thermo-efficiency is high, the secondary vapour that is produced and flue gas mix mutually, and it is low to separate utilization again or heat energy utilization rate, is characterized in the operational path weak point, and equipment is simple, but energy consumption is very high.
The immediate problem that existing gas suspension calcination of aluminium hydroxide stove sinter process exists is: though more reasonable aspect heat energy utilization, the not enough science of heat energy quality utilization.Show that the high-quality energy (coal gas or heavy oil) does not have effectively acting and final water, the cigarette vapour mixture that has all formed low grade heat energy after burning; Because hot water that forms and cigarette stripping temperature and pressure are low, waste heat almost can't utilize, and causes the loss of great amount of heat energy and hot water.
Smith's stoving oven of Denmark is born in the phase early 1980s; Energy prices at that time are very low; About 13 dollars one barrel; And the energy consumption of Aluminium hydroxide roasting process only accounts for 8% of alumina producing whole process energy consumption, and shared alumina production cost ratio is very low, so there is no need to select other energy-conservation heating sinter process route.Yet now situation has become, and it is all very high that energy prices, water price and energy consumption account for alumina production cost, and energy-conservation, water saving also concerns sustainable development.So the present energy-saving and cost-reducing heating sinter process of employing of being badly in need of to reduce the market competition direct production cost of fierce aluminum oxide enterprise unusually, is more conducive to the Sustainable development of alumina industry.
Summary of the invention
The object of the invention utilizes not science and custom-designed a kind of new technology for gas suspension calcination of aluminium hydroxide to above-mentioned existing in prior technology heat energy quality just.
The principle of work of novel process of the present invention is: with the higher-grade chemical energy of combustion gas or the fuel oil thermal source as Aluminium hydroxide roasting; And utilize the warm air that comes out from waste heat boiler as ignition dope; Utilize the direct heat exchange mode; Be evaporated the major part in the white lake (about 70%) crystal water earlier; Convert pyritous gas to through the dedusting humidification and to be suitable for pressure that evaporization process uses live steam, and then roasting carries out the crystal formation conversion, promptly most of heat energy by-product live steam again in dehydration as 0.5-1.0MPa.
The objective of the invention is to realize: new technology for gas suspension calcination of aluminium hydroxide of the present invention through following technical scheme; Comprise following processing unit and operation successively: feeding machine feed → Venturi flash dryer → multistage preheating and drying device → Aluminium hydroxide roasting stove → thermal separation whirlwind tube → cooling body → finished product aluminum oxide; On multistage preheating and drying device, be connected with the thermal chimney road that leads to the Venturi flash dryer; On thermal separation whirlwind tube, be connected with the thermal chimney road that leads to multistage preheating and drying device; Wherein: also comprise waste heat boiler and humidification cyclone dust catcher in the system; Cooling body is a circular cooler; On circular cooler, be connected with the hot-air duct that leads to waste heat boiler; On waste heat boiler, be connected with the hot-air duct that leads to the Aluminium hydroxide roasting stove, on the Aluminium hydroxide roasting stove, be connected with the steam pipeline that leads to the humidification cyclone dust catcher, supply evaporation section to use as the live steam source by humidification cyclone dust catcher steam that comes out and the steam that comes out from waste heat boiler.
In the present invention, said multistage preheating and drying device is one to level Four preheating and drying device.
Be 0.5-1.0MPa by humidification cyclone dust catcher (this type of Equipment Market is on sale) steam that comes out and the vapor pressure that comes out from waste heat boiler, mix the back and supply evaporation section to use as the live steam source.
Through the warm air that circular cooler produces, after adding thermogenesis steam, become the secondary warm air and get into stoving oven to deionized water, use as ignition dope, promptly waste heat has obtained second stage employ.
Whole technological process of the present invention is:
The wet hydrogen aluminum oxide of moisture 8-12% gets into the Venturi flash dryer through screw feeder, the wet hydrogen aluminum oxide with mix mutually from a hot flue gas (350～400 ℃) of coming to level Four preheating and drying device, material is heated at this; From material and gas process cyclonic separation that flash dryer comes out, gas is disposed to atmosphere through after the dedusting; Solid materials is that the dry hydrogen aluminum oxide falls into one to level Four preheating and drying device bottom, meets with the hot flue gas that comes out from thermal separation whirlwind tube (about 1000～1100 ℃ of temperature), and dry material white lake is brought in the Aluminium hydroxide roasting stove by air-flow in heat temperature raising; In the preheating and drying process, material is heated to 320～360 ℃ from about 130 ℃, and at this moment white lake is sloughed partial crystallization water.
The secondary warm air that comes out from waste heat boiler is as ignition dope, and dry material is warming up to 1150～1200 ℃ by the heat that fuel combustion produces in the Aluminium hydroxide roasting stove, carries out the roasting reaction and realizes crystal conversion; In the roasting reaction process; Most of crystal water in the white lake is removed, and it is that steam and the pressure that comes out from waste heat boiler of 0.5-1.0MPa is subsequent use as the live steam source after the steam of 0.5-1.0MPa that the high-temperature gas of generation forms pressure through the humidification rotational flow dust-removing; Be transformed into high temperature alumina through the material after the roasting and get into thermal separation whirlwind tube; Isolated hot flue gas goes one to heat to level Four preheating and drying device as thermal source (about 1000～1100 ℃ of temperature); Isolated aluminum oxide obtains the finished product aluminum oxide after getting into circular cooler (this Equipment Market is on sale) and air heat exchange cooling, and air becomes warm air (about 600～800 ℃ of temperature) after by the heat exchange of thermooxidizing aluminium and gets into waste heat boiler to add thermogenesis pressure to deionized water be that the steam of 0.5-1.0MPa supplies evaporation section to use.
System of the present invention and process step have following characteristics:
1, novel process is the technological transformation of on existing Technology basis, carrying out, and has kept the main flow and the major equipment of prior art, is convenient to industrializing implementation.
2, novel process is when rationally utilizing heat energy, and the heat energy quality also is improved, and has promptly produced useful live steam.
3, on high temperature alumina product UTILIZATION OF VESIDUAL HEAT IN, not only preheating air, but also produced the steam of high added value, for alumina producing provides valuable evaporation thermal source.
4, reclaim the steam that the Aluminium hydroxide roasting process produces, and made it to change into live steam, greatly reduced the production run cost.
5, this programme is brand-new energy-conservation novel roasting technology, for China's aluminium industrial sustainable development provides technical support.
Description of drawings
Fig. 1 is existing gas suspension calcination of aluminium hydroxide process flow sheet.
Fig. 2 is the new technology for gas suspension calcination of aluminium hydroxide schema.
Embodiment
The present invention does further to set forth to gas suspension calcination of aluminium hydroxide stove novel roasting process below in conjunction with accompanying drawing:
As shown in Figure 2: new technology for gas suspension calcination of aluminium hydroxide of the present invention; Comprise following processing unit and operation successively: feeding machine feed → Venturi flash dryer → one is to level Four preheating and drying device → Aluminium hydroxide roasting stove → thermal separation whirlwind tube → cooling body → finished product aluminum oxide; On multistage preheating and drying device, be connected with the thermal chimney road that leads to the Venturi flash dryer; On thermal separation whirlwind tube, be connected with the thermal chimney road that leads to multistage preheating and drying device; Wherein: also comprise waste heat boiler and humidification cyclone dust catcher in the system; Cooling body is a circular cooler; On circular cooler, be connected with the hot-air duct that leads to waste heat boiler, on waste heat boiler, be connected with the hot-air duct that leads to the Aluminium hydroxide roasting stove, on the Aluminium hydroxide roasting stove, be connected with the steam pipeline that leads to the humidification cyclone dust catcher; Be 0.5-1.0MPa by humidification cyclone dust catcher steam that comes out and the vapor pressure that comes out from waste heat boiler, mix the back and supply evaporation section to use as the live steam source.
Its production process is: the wet hydrogen aluminum oxide of moisture 8-12% gets into the Venturi flash dryer through screw feeder, the wet hydrogen aluminum oxide with mix mutually from a hot flue gas (350～400 ℃) of coming to level Four preheating and drying device, material is heated at this; From material and gas process cyclonic separation that flash dryer comes out, gas is disposed to atmosphere through after the dedusting; Solid materials is that the dry hydrogen aluminum oxide falls into one to level Four preheating and drying device bottom, meets with the hot flue gas that comes out from thermal separation whirlwind tube (about 1000～1100 ℃ of temperature), and dry material white lake is brought in the Aluminium hydroxide roasting stove by air-flow in heat temperature raising; In the preheating and drying process, material is heated to 320～360 ℃ from about 130 ℃, and at this moment white lake is sloughed partial crystallization water.
The secondary warm air that comes out from waste heat boiler is as ignition dope, and dry material is warming up to 1150～1200 ℃ by the heat that fuel combustion produces in the Aluminium hydroxide roasting stove, carries out the roasting reaction and realizes crystal conversion; In the roasting reaction process; Most of crystal water in the white lake is removed, and it is that steam and the pressure that comes out from waste heat boiler of 0.5-1.0MPa is subsequent use as the live steam source after the steam of 0.5-1.0MPa that the gas of generation forms pressure through the humidification rotational flow dust-removing; Be transformed into high temperature alumina through the material after the roasting and get into thermal separation whirlwind tube; Isolated hot flue gas goes one to heat to level Four preheating and drying device as thermal source (about 1000～1100 ℃ of temperature); Isolated aluminum oxide obtains the finished product aluminum oxide after getting into circular cooler and air heat exchange cooling, and air becomes warm air (about 600～800 ℃ of temperature) after by the heat exchange of thermooxidizing aluminium and gets into waste heat boiler to add thermogenesis pressure to deionized water be that the steam of 0.5-1.0MPa supplies the evaporation section use.
Claims (4)
1. new technology for gas suspension calcination of aluminium hydroxide; Comprise following processing unit and operation successively: feeding machine feed → Venturi flash dryer → multistage preheating and drying device → Aluminium hydroxide roasting stove → thermal separation whirlwind tube → cooling body → finished product aluminum oxide; On multistage preheating and drying device, be connected with the thermal chimney road that leads to the Venturi flash dryer; On thermal separation whirlwind tube, be connected with the thermal chimney road that leads to multistage preheating and drying device; It is characterized in that: also comprise waste heat boiler and humidification cyclone dust catcher in the system; Cooling body is a circular cooler, on circular cooler, is connected with the hot-air duct that leads to waste heat boiler, on waste heat boiler, is connected with the secondary hot-air duct that leads to the Aluminium hydroxide roasting stove; On the Aluminium hydroxide roasting stove, be connected with the steam pipeline that leads to the humidification cyclone dust catcher, supply evaporation section to use as the live steam source by humidification cyclone dust catcher steam that comes out and the steam that comes out from waste heat boiler.
2. new technology for gas suspension calcination of aluminium hydroxide according to claim 1 is characterized in that: multistage preheating and drying device is one to level Four preheating and drying device.
3. new technology for gas suspension calcination of aluminium hydroxide according to claim 1; It is characterized in that: be 0.5-1.0MPa by humidification cyclone dust catcher steam that comes out and the vapor pressure that comes out from waste heat boiler, mix the back and supply evaporation section to use as the live steam source.
4. new technology for gas suspension calcination of aluminium hydroxide according to claim 1; It is characterized in that: through the warm air of circular cooler generation; After adding thermogenesis steam to deionized water, become the secondary warm air and get into stoving oven, use as ignition dope, promptly waste heat has obtained second stage employ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102317535A CN101870492B (en) | 2010-07-14 | 2010-07-14 | New technology for gas suspension calcination of aluminium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102317535A CN101870492B (en) | 2010-07-14 | 2010-07-14 | New technology for gas suspension calcination of aluminium hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101870492A CN101870492A (en) | 2010-10-27 |
| CN101870492B true CN101870492B (en) | 2012-01-11 |
Family
ID=42995606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102317535A Active CN101870492B (en) | 2010-07-14 | 2010-07-14 | New technology for gas suspension calcination of aluminium hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101870492B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090675B (en) * | 2011-11-02 | 2014-10-22 | 天华化工机械及自动化研究设计院有限公司 | Continuous vacuum drying and roasting combined method and device thereof |
| CN103449488B (en) * | 2012-05-31 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Reduce the method that Aluminium hydroxide roasting Process Energy consumes |
| CN103496726B (en) * | 2013-08-30 | 2016-05-18 | 鞠复勇 | A kind of aluminum oxide gaseous state suspending calcining stove and technique |
| CN103771476B (en) * | 2014-01-26 | 2015-07-08 | 郑州金阳光陶瓷有限公司 | Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace |
| CN105485670B (en) * | 2014-09-18 | 2018-03-20 | 沈阳铝镁设计研究院有限公司 | The optimization combustion method and special equipment of a kind of alumina producer gaseous pollutant control |
| CN105000582B (en) * | 2015-08-28 | 2016-08-24 | 沈阳鑫博工业技术股份有限公司 | A kind of system and method for roasting aluminium hydroxide recycle-water steam |
| CN106219584B (en) * | 2016-07-18 | 2017-12-26 | 沈阳鑫博工业技术股份有限公司 | The device and method of alpha-aluminium oxide content in a kind of reduction metallurgical-grade aluminum oxide |
| CN106334622B (en) * | 2016-08-26 | 2018-09-14 | 中冶北方（大连）工程技术有限公司 | A kind of ore-dressing technique of extremely frigid zones speculum iron fine ore |
| CN107246805A (en) * | 2017-07-21 | 2017-10-13 | 沈阳鑫博工业技术股份有限公司 | A kind of Aluminium hydroxide roasting kiln gas processing unit and method |
| CN111675233B (en) * | 2020-05-28 | 2023-11-10 | 宁夏盈氟金和科技有限公司 | System and method for producing anhydrous aluminum fluoride by double fluidized beds |
| CN111500853B (en) * | 2020-05-29 | 2021-08-06 | 东北大学 | Bauxite suspension roasting dehydration dry method deironing system |
| CN112174175A (en) * | 2020-09-22 | 2021-01-05 | 河南华慧有色工程设计有限公司 | Energy-concerving and environment-protective type aluminium hydroxide suspension calcination equipment |
| CN113461040B (en) * | 2021-08-05 | 2023-09-19 | 沈阳铝镁设计研究院有限公司 | Novel aluminum hydroxide steam-producing suspension roasting furnace device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2785050A (en) * | 1952-08-21 | 1957-03-12 | Allied Chem & Dye Corp | Two-stage fluid-suspension roasting of iron sulfide ore |
| CN101324408B (en) * | 2008-08-04 | 2010-06-02 | 中国铝业股份有限公司 | Flue gas waste heat recovery method of aluminum oxide gaseous state suspending calcining furnace |
| CN201442875U (en) * | 2009-07-31 | 2010-04-28 | 刘鹤群 | Aluminum hydroxide suspending calcining kiln |
-
2010
- 2010-07-14 CN CN2010102317535A patent/CN101870492B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101870492A (en) | 2010-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101870492B (en) | New technology for gas suspension calcination of aluminium hydroxide | |
| CN103193400B (en) | Temperature-controllsuspension suspension roaster | |
| CN103575068A (en) | Lignite drying water recycling and drying tail gas recycling system | |
| CN103925605A (en) | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through pulverized coal burning | |
| CN203561148U (en) | Lignite dry water recovering and dry tail gas recycling system | |
| CN203771439U (en) | High-moisture lignite medium speed mill coal pulverizing system using pulverized coal combustion heating primary air | |
| CN206496338U (en) | A kind of co-generation unit under superhigh temperature super-pressure parameter | |
| CN203549787U (en) | Single-pressure saturated vapor superheated boiler | |
| CN110118492B (en) | Waste heat utilization production system based on super internal combustion baked brick tunnel kiln | |
| CN103939158A (en) | Low-rank coal purification power generation system | |
| CN106610016A (en) | Combined heat and power generation system under super-high temperature and super-high pressure parameters and method thereof | |
| CN208635581U (en) | A kind of pure cryogenic cement kiln afterheat utilizing system | |
| CN207945929U (en) | A kind of device for drying raw coal using the double waste heats in power station | |
| CN206219496U (en) | A kind of retort with waste heat recovery | |
| CN104341084B (en) | For the energy-saving printing and dyeing sludge dehumidification system of cogeneration | |
| CN203384961U (en) | Boiler tail gas waste heat reclaimer | |
| CN205014803U (en) | Utilize waste heat of boiler flue gas's drying device | |
| CN202153054U (en) | Energy-saving and environment-friendly hot blast stove | |
| CN205640887U (en) | Sediment waste heat utilization's air -cooled system at bottom of improvement circulating fluidized bed boiler | |
| CN204329327U (en) | A kind of biomass fuel thermal medium boiler | |
| CN204786512U (en) | Unit pulverized -coal system with coal drying and water recovery function | |
| CN110030861A (en) | A kind of Novel flue gas waste heat recycle method | |
| CN204114984U (en) | With the stove cigarette dry enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN204058259U (en) | A kind of take coal dust as the roasting assembly of fuel | |
| CN203269590U (en) | Caustic soda evaporation equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HENAN KDNEU INTERNATIONAL ENGINEERING CO., LTD. Free format text: FORMER NAME: HE NAN NEUTL METALLURGY SCIENCE + TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 450008, No. 1, No. 32, Fortune Plaza, No. three, 19, Henan, Zhengzhou Patentee after: HENAN KDNEU INTERNATIONAL ENGINEERING CO., LTD. Address before: 450008, No. 1, No. 32, Fortune Plaza, No. three, 19, Henan, Zhengzhou Patentee before: Henan Dongda Tailong Metallurgy Technology Co., Ltd. |