CN105202932A - Method and device for flue gas waste heat utilization of aluminum oxide roasting furnace - Google Patents
Method and device for flue gas waste heat utilization of aluminum oxide roasting furnace Download PDFInfo
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- CN105202932A CN105202932A CN201410295430.0A CN201410295430A CN105202932A CN 105202932 A CN105202932 A CN 105202932A CN 201410295430 A CN201410295430 A CN 201410295430A CN 105202932 A CN105202932 A CN 105202932A
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- flue gas
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- heat recovery
- recovery device
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method and device for flue gas waste heat utilization. Flue gas of an outlet of an electric dust collecting device enters the lower portion of a waste heat recovery device from the lower portion of a flue gas waste heat recovery device through a flue gas pipeline, after performing indirect heat exchanging with hot water in the lower portion of the waste heat recovery device, the flue gas enters the upper portion of the waste heat recovery device from a fuel gas connecting pipe to perform direct heat exchanging with cold water, and the cold water is pumped into the upper portion of the flue gas waste heat recovery device from the interior of a cold water pipe through a cold water pump; 70-80-DEG C hot water which is generated after the cold water is processed through direct heat exchanging automatically flows into the lower portion of the waste heat recovery device and then performs indirect heat exchanging with hot flue gas at the lower portion of the waste heat recovery device, and 85-95-DEG C hot water generated after heat exchanging automatically flows to a bottom hot water tank and delivered to a procedure needing the hot water through a hot water pump. The temperature of the recovered hot water can reach 85 DEG C to 95 DEG C, the hot water can be directly used for red mud washing and aluminum hydroxide washing, sensible heat and latent heat in the flue gas can be fully recovered, and more than 25 kg of standard coal can be saved every one ton of aluminum oxide.
Description
Technical field
The present invention relates to method and the device of the utilization of a kind of fume afterheat, particularly relate to method and the device of the aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN in alumina producing.
Background technology
In alumina producer is produced, adopt gaseous pollutant control, fluidization flash roaster or circulating roaster roasting aluminium hydroxide, to remove the crystallization water in aluminium hydroxide and attached water, and complete part crystal transfer, obtain final alumina product.The EGT about 135 DEG C ~ 180 DEG C that roaster is discharged, and in waste gas containing have an appointment 40% ~ 55% water vapour, the waste gas of therefore discharging will take away a large amount of sensible heats and latent heat, if do not recycled this part water and heat, beyond doubt kind of waste.At present, more domestic alumina producers take measures to reclaim baking furnace fume waste heat as far as possible, the method that these alumina producers adopt is all adopt finned heat exchanger or heat exchange of heat pipe by flue gas and cold water indirect heat exchange, exhaust gas temperature is reduced as far as possible, but control more than acid dew-point temperature (~ 145 DEG C), to prevent corrosion, water at low temperature heating is used for domestic water or produces slurry etc. by the heat of recovery.But this flue gas waste heat recovery method is only the part sensible heat that make use of flue gas, for furnace flue gas, the sensible heat of flue gas only accounts for about 12% of flue gas total amount of heat, and the heat of about 88% is the latent heat of water vapour in flue gas.Also have by the latent heat in the mode recovered flue gas of direct heat transfer, but due to the reason of flue gas water dew point, after reclaiming, water temperature only has 70 ~ 80 DEG C, and the hot water of this temperature needs to carry out being heated to the needs that 85 ~ 95 DEG C of ability meet red mud for alumina plant washing and aluminium hydroxide washing again.
Summary of the invention
In order to solve the problems of the technologies described above the method and device that the invention provides a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, object reclaims aluminum oxide roasting furnace flue gas sensible heat and latent heat, the hot water obtained after waste heat recovery can reach 85 ~ 95 DEG C, meets the needs of red mud for alumina plant washing and aluminium hydroxide washing.
In order to solve the problems of the technologies described above, the present invention is achieved in that a kind of method of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, electricity dust arrester installation exiting flue gas enters into waste-heat recovery device bottom by flue gas pipeline from the bottom of flue gas waste heat recovery apparatus, enter into waste-heat recovery device top from flue gas tube connector after hot water in flue gas and waste-heat recovery device bottom carries out indirect heat exchange and cold water carries out direct heat transfer, cold water is pumped into flue gas waste heat recovery apparatus top by water supply pump in cold water pipe; The hot water of 70 ~ 80 DEG C of cold water after direct heat transfer flows automatically to after in waste-heat recovery device bottom and heat smoke carries out indirect heat exchange in waste-heat recovery device bottom, the hot water of 85 ~ 95 DEG C that produce after heat exchange, from flowing to Base Heat water tank, delivers to the operation needing hot water by heat-exchanger pump.
A kind of device of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, electricity dust arrester installation is connected with the side, waste-heat recovery device bottom of flue gas waste heat recovery apparatus by flue gas pipeline, waste-heat recovery device bottom opposite side is connected with waste-heat recovery device top by flue gas tube connector, waste-heat recovery device bottom is provided with boiler, boiler is connected with hot-water line, and waste-heat recovery device top is connected with cold water pipe.
Flue gas pipeline is provided with air blast.
Hot-water line is provided with heat-exchanger pump.
Cold water pipe is provided with water supply pump.
Water in flue gas waste heat recovery apparatus top and flue gas direct heat transfer adopt the one in plate column heat exchange, spray column heat exchange or packed tower heat exchange.
Water in flue gas waste heat recovery apparatus bottom and flue gas indirect heat exchange adopt the one of restraining in heat exchange or fin heat exchange.
Cold water is new water or alumina producer recirculated water.
After heat exchange, hot water is used for laterite washing or aluminium hydroxide washing.
advantage of the present invention and effect:
The present invention does not change alumina producing flow process, after increasing flue gas waste heat recovery apparatus and auxiliary equipment, after reclaiming, hot water temperature can reach 85 ~ 95 DEG C, laterite washing and aluminium hydroxide washing can be directly used in, sensible heat in abundant recovered flue gas and latent heat, aluminium oxide per ton can save energy 25kg and marks more than coal.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Fig. 2 is flue gas waste heat recovery apparatus structural representation of the present invention.
In figure: 1, electric dust arrester installation; 2, air blast; 3, flue gas pipeline; 4, flue gas waste heat recovery apparatus; 5, cold water pipe; 6, water supply pump; 7, hot-water line; 8, heat-exchanger pump; 9, flue gas after heat exchange; 11, smoke exhaust pipe; 12, waste-heat recovery device top; 13, waste-heat recovery device bottom; 14, boiler; 15, flue gas tube connector.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
As shown in the figure, the method of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN of the present invention, electricity dust arrester installation 1 exiting flue gas enters into waste-heat recovery device bottom 13 by flue gas pipeline 3 from the bottom of flue gas waste heat recovery apparatus 4, enter into waste-heat recovery device top 12 from flue gas tube connector 15 after hot water in flue gas and waste-heat recovery device bottom 13 carries out indirect heat exchange and carry out direct heat transfer with cold water, cold water is pumped into flue gas waste heat recovery apparatus top 12 by water supply pump 6 in cold water pipe 5; The hot water of 70 ~ 80 DEG C of cold water after direct heat transfer flows automatically to after in waste-heat recovery device bottom 13 and heat smoke carries out indirect heat exchange in waste-heat recovery device bottom 13, the hot water of 85 ~ 95 DEG C that produce after heat exchange, from flowing to Base Heat water tank 14, delivers to the operation needing hot water by heat-exchanger pump 8.
A kind of device of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, electricity dust arrester installation 1 is connected with the side, waste-heat recovery device bottom 13 of flue gas waste heat recovery apparatus 4 by flue gas pipeline 3, waste-heat recovery device bottom 13 opposite side is connected with waste-heat recovery device top 12 by flue gas tube connector 15, waste-heat recovery device bottom 13 is provided with boiler 14, boiler 14 is connected with hot-water line 7, waste-heat recovery device top 12 is connected with cold water pipe 5, and after heat exchange, flue gas 9 enters air through smoke exhaust pipe 11.
Flue gas pipeline 3 is provided with air blast 2.
Hot-water line 7 is provided with heat-exchanger pump 8.
Cold water pipe 5 is provided with water supply pump 6.
Water in waste-heat recovery device top 12 and flue gas direct heat transfer adopt the one in plate column heat exchange, spray column heat exchange or packed tower heat exchange.
Water in waste-heat recovery device bottom 13 and flue gas indirect heat exchange adopt the one of restraining in heat exchange or fin heat exchange.
Cold water is new water or alumina producer recirculated water.
After heat exchange, hot water is used for laterite washing or aluminium hydroxide washing.
Claims (9)
1. the method for an aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that electric dust arrester installation exiting flue gas enters into waste-heat recovery device bottom by flue gas pipeline from the bottom of flue gas waste heat recovery apparatus, enter into waste-heat recovery device top from flue gas tube connector after hot water in flue gas and waste-heat recovery device bottom carries out indirect heat exchange and cold water carries out direct heat transfer, cold water is pumped into flue gas waste heat recovery apparatus top by water supply pump in cold water pipe; The hot water of 70 ~ 80 DEG C of cold water after direct heat transfer flows automatically to after in waste-heat recovery device bottom and heat smoke carries out indirect heat exchange in waste-heat recovery device bottom, the hot water of 85 ~ 95 DEG C that produce after heat exchange, from flowing to Base Heat water tank, delivers to the operation needing hot water by heat-exchanger pump.
2. the device of an aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN, it is characterized in that electric dust arrester installation is connected with the side, waste-heat recovery device bottom of flue gas waste heat recovery apparatus by flue gas pipeline, waste-heat recovery device bottom opposite side is connected with waste-heat recovery device top by flue gas tube connector, waste-heat recovery device bottom is provided with boiler, boiler is connected with hot-water line, and waste-heat recovery device top is connected with cold water pipe.
3. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that flue gas pipeline is provided with air blast.
4. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that hot-water line is provided with heat-exchanger pump.
5. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that cold water pipe is provided with water supply pump.
6. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that water in flue gas waste heat recovery apparatus top and flue gas direct heat transfer adopt the one in plate column heat exchange, spray column heat exchange or packed tower heat exchange.
7. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that water in flue gas waste heat recovery apparatus bottom and flue gas indirect heat exchange adopt the one of restraining in heat exchange or fin heat exchange.
8. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, is characterized in that cold water is new water or alumina producer recirculated water.
9. the device of a kind of aluminum oxide roasting furnace flue gas UTILIZATION OF VESIDUAL HEAT IN according to claim 2, after it is characterized in that heat exchange, hot water is for laterite washing or aluminium hydroxide washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410295430.0A CN105202932A (en) | 2014-06-27 | 2014-06-27 | Method and device for flue gas waste heat utilization of aluminum oxide roasting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410295430.0A CN105202932A (en) | 2014-06-27 | 2014-06-27 | Method and device for flue gas waste heat utilization of aluminum oxide roasting furnace |
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| CN105202932A true CN105202932A (en) | 2015-12-30 |
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| CN201410295430.0A Pending CN105202932A (en) | 2014-06-27 | 2014-06-27 | Method and device for flue gas waste heat utilization of aluminum oxide roasting furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482139A (en) * | 2016-08-20 | 2017-03-08 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycles equipment |
| CN106595328A (en) * | 2017-01-13 | 2017-04-26 | 秦皇岛信能能源设备有限公司 | Heat energy transmission device combining exhaust gas and water of melting furnace |
| 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 |
| CN113446862A (en) * | 2020-03-24 | 2021-09-28 | 沈阳铝镁设计研究院有限公司 | Flue gas waste heat recovery device for aluminum hydroxide roasting furnace |
Citations (5)
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| US3894853A (en) * | 1974-07-10 | 1975-07-15 | Air Pollution Ind | Gas treating apparatus |
| CN2231367Y (en) * | 1995-01-23 | 1996-07-17 | 上海海运学院 | Combined condensation waste heat recovery device |
| CN101221021A (en) * | 2008-01-07 | 2008-07-16 | 成琳国 | Flue gas condenser |
| CN202109656U (en) * | 2011-04-06 | 2012-01-11 | 刘长征 | Natural gas and smoke condensation type waste heat utilization device |
| CN203672160U (en) * | 2014-01-14 | 2014-06-25 | 沈阳铝镁设计研究院有限公司 | Recovery device of dust in smoke of aluminum hydroxide roasting furnace |
-
2014
- 2014-06-27 CN CN201410295430.0A patent/CN105202932A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3894853A (en) * | 1974-07-10 | 1975-07-15 | Air Pollution Ind | Gas treating apparatus |
| CN2231367Y (en) * | 1995-01-23 | 1996-07-17 | 上海海运学院 | Combined condensation waste heat recovery device |
| CN101221021A (en) * | 2008-01-07 | 2008-07-16 | 成琳国 | Flue gas condenser |
| CN202109656U (en) * | 2011-04-06 | 2012-01-11 | 刘长征 | Natural gas and smoke condensation type waste heat utilization device |
| CN203672160U (en) * | 2014-01-14 | 2014-06-25 | 沈阳铝镁设计研究院有限公司 | Recovery device of dust in smoke of aluminum hydroxide roasting furnace |
Non-Patent Citations (1)
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| 王亮等: "《焙烧炉烟气余热利用的前景》", 《辽宁化工》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482139A (en) * | 2016-08-20 | 2017-03-08 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycles equipment |
| CN106482139B (en) * | 2016-08-20 | 2018-07-20 | 苏州舒跃碳吸附剂有限公司 | A kind of off-gas recovery recycling equipment |
| CN106595328A (en) * | 2017-01-13 | 2017-04-26 | 秦皇岛信能能源设备有限公司 | Heat energy transmission device combining exhaust gas and water of melting furnace |
| CN106595328B (en) * | 2017-01-13 | 2019-10-22 | 秦皇岛信能能源设备有限公司 | A kind of thermal energy transfer device of waste gas of melting furnace in conjunction with water |
| 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 |
| CN113446862A (en) * | 2020-03-24 | 2021-09-28 | 沈阳铝镁设计研究院有限公司 | Flue gas waste heat recovery device for aluminum hydroxide roasting furnace |
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Application publication date: 20151230 |