CN102313454A - Waste heat recovery device of calcinator - Google Patents

Waste heat recovery device of calcinator Download PDF

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Publication number
CN102313454A
CN102313454A CN201010212265XA CN201010212265A CN102313454A CN 102313454 A CN102313454 A CN 102313454A CN 201010212265X A CN201010212265X A CN 201010212265XA CN 201010212265 A CN201010212265 A CN 201010212265A CN 102313454 A CN102313454 A CN 102313454A
Authority
CN
China
Prior art keywords
heat recovery
roaster
heat exchanger
waste
heat
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.)
Pending
Application number
CN201010212265XA
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Chinese (zh)
Inventor
廖新勤
郭沈
姜跃华
王丽娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Original Assignee
Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd filed Critical Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority to CN201010212265XA priority Critical patent/CN102313454A/en
Publication of CN102313454A publication Critical patent/CN102313454A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The invention relates to a waste heat recovery device, in particular to a waste heat recovery device of an aluminum hydroxide calcinator in alumina production. The waste heat recovery device of the calcinator comprises the calicnator and a chimney and is characterized in that at least one waste heat recovery heat exchanger is arranged between the calcinator and the chimney, a smoke ventilator is arranged between the waste heat recovery heat exchanger and the calcinator, the smoke ventilator is connected with the calcinator through a front smoke tube of the smoke ventilator, the smoke ventilator is connected with the waste heat recovery heat exchanger through a rear smoke tube of the smoke ventilator, the waste heat recovery heat exchanger is connected with the chimney through a front smoke tube of the chimney, the upper part of the waste heat recovery heat exchanger is communicated with a cooling tube, and the bottom of the waste heat recovery heat exchanger is communicated with a hot water tube.

Description

The roaster waste-heat recovery device
Technical field
The present invention relates to a kind of waste-heat recovery device, relate in particular to the Aluminium hydroxide roasting furnace exhaust waste-heat recovery device in alumina producing.
Background technology
, adopts alumina producer the technology and the device of gas suspension calcination stove, fluidization flash roaster or circulating roaster roasting aluminium hydroxide in producing; To remove the crystallization water and the attached water in the aluminium hydroxide; And accomplish the part crystal transfer, obtain final alumina product.About 135 ℃~180 ℃ of the EGT that roaster is discharged, and contain 46% the water vapour of having an appointment in the waste gas, the waste gas of therefore discharging will be taken away a large amount of sensible heats and latent heat, as effectively not reclaiming, will cause the lot of energy loss to this part heat.
In alumina producing, the aluminium hydroxide that decomposes output need pass through washing with alkali and aluminium oxide in the recovery aluminium hydroxide attached liquid, and the alkalinity of assurance alumina product is less than 0.5%; Abandon red mud and need pass through washing, make the alkalinity of abandoning red mud be lower than 5~6kg-Na to reclaim alkali and the aluminium oxide in the wastewater from red mud 2The dried red mud of O/t-, these washing process all need use hot water.
Summary of the invention
The invention provides a kind of roaster waste-heat recovery device in order to solve the problems of the technologies described above, purpose is the waste heat that reclaims in the roaster combustion gas, saves the energy.
In order to solve the problems of the technologies described above; The present invention is achieved in that the roaster waste-heat recovery device, comprises roaster, induced-draft fan, heat recovery heat exchanger and chimney, is provided with at least one heat recovery heat exchanger between described roaster and the chimney; Between heat recovery heat exchanger and roaster, be provided with induced-draft fan; Is connected through smoke pipe before the induced-draft fan between induced-draft fan and the roaster, is connected through smoke pipe behind the induced-draft fan between induced-draft fan and the heat recovery heat exchanger, be connected through the preceding smoke pipe of chimney between heat recovery heat exchanger and the chimney; The top of heat recovery heat exchanger is communicated with cold water pipe, and the bottom of heat recovery heat exchanger is communicated with hot-water line.
Described roaster is gas suspension calcination stove, fluidization flash roaster or circulating roaster.
Described cold water pipe joins with defective alkali secondary vapour condensate pipe, vaporization cycle downcomer or the red mud dump return pipe of containing of evaporation.
The multilayer drip water plate is installed in the described heat recovery heat exchanger.
The EGT that described roaster is discharged is 135 ℃~180 ℃.
Cold water temperature in the described cold water pipe is 10 ℃~75 ℃.
Hot water temperature in the described hot-water line is 76 ℃~95 ℃.
Described heat recovery heat exchanger is 1~10, is the parallel connection relation between each heat recovery heat exchanger.
Advantage of the present invention and effect:
The present invention does not change the alumina producing main flow; Only be to have changed to evaporate the defective trend that contains water and red mud dump backwater under alkali secondary vapour condensed water, the vaporization cycle; And effectively utilized the high-temp waste gas that roaster is discharged; Can reclaim sensible heat and the sensible heat and the heat of transformation of water vapour in the high-temp waste gas that the roaster system discharges effectively, and be easy to simple enforcement.
Is example in a daily output 1300 tons of aluminium oxide, running rates by 90% roaster, can receive following effect after the embodiment of the present invention:
Annual recyclable heat 207700GJ, 7087 tons of folding standard coals; 70,000 tons of recycle-waters, about 4,700,000 yuan altogether of year wound economic benefits;
The heat that reclaims can be used for whole red mud wash waters and the heating of aluminium hydroxide wash water of producing 200000 tons of aluminium oxide factories per year.
Can reduce power plant for self-supply's evaporation capacity for engine for newly founding the factory, reduce water supply capacity.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1. roaster, 2. smoke pipe before the induced-draft fan, 3. induced-draft fan, 4. smoke pipe behind the induced-draft fan, 5. heat recovery heat exchanger, 6. smoke pipe, 7. chimney, 8. cold water pipe, 9. hot-water line before the chimney.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is explained further details.
As shown in Figure 1, roaster waste-heat recovery device of the present invention is provided with a heat recovery heat exchanger 5 at least, and present embodiment is 1.Between heat recovery heat exchanger 5 and roaster 1, be provided with induced-draft fan 3; Be connected through smoke pipe 2 before the induced-draft fan between induced-draft fan 3 and the roaster 1; Be connected through smoke pipe behind the induced-draft fan 4 between induced-draft fan 3 and the heat recovery heat exchanger 5; Be connected through smoke pipe 6 before the chimney between heat recovery heat exchanger 5 and the chimney 7, the top of heat recovery heat exchanger 5 is communicated with cold water pipe 8, and the bottom of heat recovery heat exchanger 5 is communicated with hot-water line 9.Roaster 1 is gas suspension calcination stove, fluidization flash roaster or circulating roaster.Cold water pipe 8 joins with defective alkali secondary vapour condensate pipe, vaporization cycle downcomer or the red mud dump return pipe of containing of evaporation.The EGT that roaster 1 is discharged is at 135 ℃~180 ℃; Cold water temperature in the cold water pipe 8 is 10 ℃~75 ℃; Hot water temperature in the hot-water line 9 is 76 ℃~95 ℃.The defective alkali secondary vapour condensed water that contains of evaporization process after being heated can be used for washing aluminium hydroxide, and following water of evaporization process circulation after being heated or red mud dump backwater can be used for washing and abandon red mud.
Above-mentioned heat recovery heat exchanger also can be 2~10.In the time of many, between each heat recovery heat exchanger 5 the parallel connection relation.
The waste gas that cold water and roaster are discharged carries out heat exchange in heat recovery heat exchanger; Fully reclaim sensible heat, latent heat and condensate in the waste gas; The hot water that obtains after the heat exchange can be used for the laterite washing and the aluminium hydroxide washing of alumina producing; Substitute the initial steam of laterite washing and aluminium hydroxide washing procedure heating wash water, thereby practice thrift steam and water.
Heat recovery heat exchanger is water and the heat exchanger that gas (vapour) directly contacts, and multilayer trickle distribution grid is installed in the heat recovery heat exchanger, to increase the contact area of water and gas (vapour).
Behind heat recovery heat exchanger, chimney, the induced-draft fan before smoke pipe and the chimney smoke pipe adopt corrosion-resistant material to make because contain 0.03% the SO of having an appointment in the waste gas that roaster is discharged 2, ordinary carbon steel is had certain corrosiveness.
Come from the about 140 ℃ high-temp waste gas of Aluminium hydroxide roasting stove 1 before induced-draft fan behind smoke pipe 2, induced-draft fan 3, the induced-draft fan smoke pipe 4 get into heat recovery heat exchangers 5, low-temperature flue gas smoke pipe 6 before chimney about 98 ℃ after the heat exchange enters atmosphere with chimney 7.Evaporate and defectively contain under alkali secondary vapour condensed water, the vaporization cycle water or the red mud dump backwater promptly is the about 40 ℃ cold water of mean temperature; Get into heat recovery heat exchanger 5 through cold water pipe 8; Temperature raises with the high-temp waste gas heat exchange and after having reclaimed a part of vapour latent heat and the waste gas sensible heat in the waste gas; The hot water that is increased to 95 ℃ is sent to the washing red mud through hot-water line 9, or is increased to about 80 ℃ hot water and removes to wash aluminium hydroxide through hot-water line 9.

Claims (8)

1. roaster waste-heat recovery device; Comprise roaster, chimney; It is characterized in that being provided with at least one heat recovery heat exchanger between described roaster and the chimney, between heat recovery heat exchanger and roaster, be provided with induced-draft fan, be connected through smoke pipe before the induced-draft fan between induced-draft fan and the roaster; Be connected through smoke pipe behind the induced-draft fan between induced-draft fan and the heat recovery heat exchanger; Be connected through smoke pipe before the chimney between heat recovery heat exchanger and the chimney, the top of heat recovery heat exchanger is communicated with cold water pipe, and the bottom of heat recovery heat exchanger is communicated with hot-water line.
2. roaster waste-heat recovery device according to claim 1 is characterized in that described roaster is gas suspension calcination stove, fluidization flash roaster or circulating roaster.
3. roaster waste-heat recovery device according to claim 1 is characterized in that described heat recovery heat exchanger is 1~10, is the parallel connection relation between each heat recovery heat exchanger.
4. roaster waste-heat recovery device according to claim 1 is characterized in that being equipped with in the described heat recovery heat exchanger multilayer drip water plate.
5. roaster waste-heat recovery device according to claim 1 is characterized in that described cold water pipe and defective alkali secondary vapour condensate pipe, vaporization cycle downcomer or the red mud dump return pipe of containing of evaporation join.
6. roaster waste-heat recovery device according to claim 1 is characterized in that the waste gas initial temperature that described roaster is discharged is 135 ℃~180 ℃, through row behind the waste-heat recovery device to the final EGT of atmosphere less than 100 ℃.
7. roaster waste-heat recovery device according to claim 1 is characterized in that the cold water temperature in the described cold water pipe is 10 ℃~75 ℃.
8. roaster waste-heat recovery device according to claim 1 is characterized in that the hot water temperature in the described hot-water line is 76 ℃~95 ℃.
CN201010212265XA 2010-06-29 2010-06-29 Waste heat recovery device of calcinator Pending CN102313454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201010212265XA CN102313454A (en) 2010-06-29 2010-06-29 Waste heat recovery device of calcinator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010212265XA CN102313454A (en) 2010-06-29 2010-06-29 Waste heat recovery device of calcinator

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CN102313454A true CN102313454A (en) 2012-01-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776725A (en) * 2014-01-14 2015-07-15 沈阳铝镁设计研究院有限公司 Device and method for recovering dust in smoke of aluminum hydroxide roasting furnace
CN107010647A (en) * 2017-04-17 2017-08-04 石家庄工大化工设备有限公司 The dilution crystallization technique of aluminum oxide in acidity extraction flyash
CN108926981A (en) * 2017-05-24 2018-12-04 沈阳铝镁设计研究院有限公司 The desulfurization of aluminium hydroxide production process flue gas and afterheat utilizing system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067382A (en) * 1974-09-23 1978-01-10 The Hanna Mining Company Heat reclaim system
CN101324408A (en) * 2008-08-04 2008-12-17 中国铝业股份有限公司 Flue gas waste heat recovery method of aluminum oxide gaseous state suspending calcining furnace
CN101485948A (en) * 2008-01-17 2009-07-22 中国铝业股份有限公司 Method for treating fluidizing reactor flue gas in production of aluminum oxide
JP4350554B2 (en) * 2004-02-27 2009-10-21 日本スピンドル製造株式会社 Condensation prevention method in piping
CN201803598U (en) * 2010-06-29 2011-04-20 沈阳铝镁设计研究院 Device for recovering waste heat of baking furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067382A (en) * 1974-09-23 1978-01-10 The Hanna Mining Company Heat reclaim system
JP4350554B2 (en) * 2004-02-27 2009-10-21 日本スピンドル製造株式会社 Condensation prevention method in piping
CN101485948A (en) * 2008-01-17 2009-07-22 中国铝业股份有限公司 Method for treating fluidizing reactor flue gas in production of aluminum oxide
CN101324408A (en) * 2008-08-04 2008-12-17 中国铝业股份有限公司 Flue gas waste heat recovery method of aluminum oxide gaseous state suspending calcining furnace
CN201803598U (en) * 2010-06-29 2011-04-20 沈阳铝镁设计研究院 Device for recovering waste heat of baking furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776725A (en) * 2014-01-14 2015-07-15 沈阳铝镁设计研究院有限公司 Device and method for recovering dust in smoke of aluminum hydroxide roasting furnace
CN107010647A (en) * 2017-04-17 2017-08-04 石家庄工大化工设备有限公司 The dilution crystallization technique of aluminum oxide in acidity extraction flyash
CN107010647B (en) * 2017-04-17 2018-11-27 石家庄工大化工设备有限公司 The dilution crystallization technique of aluminium oxide in acidity extraction flyash
CN108926981A (en) * 2017-05-24 2018-12-04 沈阳铝镁设计研究院有限公司 The desulfurization of aluminium hydroxide production process flue gas and afterheat utilizing system and method

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Application publication date: 20120111