CN104075583A - Dust collection device and method of aluminium oxide roasting furnace - Google Patents
Dust collection device and method of aluminium oxide roasting furnace Download PDFInfo
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- CN104075583A CN104075583A CN201410333373.0A CN201410333373A CN104075583A CN 104075583 A CN104075583 A CN 104075583A CN 201410333373 A CN201410333373 A CN 201410333373A CN 104075583 A CN104075583 A CN 104075583A
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- distributor
- roasting furnace
- bagroom
- pipeline
- alumina roasting
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Filtering Of Dispersed Particles In Gases (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a dust collection device and method of an aluminium oxide roasting furnace. The dust collection device comprises a cloth bag dust collector, a first distributor, a second distributor and a dust returning pipeline. One end of the first distributor is connected with a flue gas outlet of the roasting furnace, and the other end of the first distributor is connected with the cloth bag dust collector through a pipeline. The first distributor is a box body, an airflow distribution plate is mounted in the box body, and the airflow distribution plate constitutes a horn-shaped channel with a narrow inlet and a wide outlet. One end of the second distributor is connected with the cloth bag dust collector through a pipeline, the other end of the second distributor is connected with a draught fan, and the second distributor is a box body. One end of the dust returning pipeline is connected with the cloth bag dust collector, and the other end of the dust returning pipeline is connected with the roasting furnace. According to the dust collecting device and method of the aluminium oxide roasting furnace, in the flue gas purification process of the aluminium oxide roasting furnace, efficient and stable operation, safety and energy saving can be achieved, the exhaust gas emission concentration can meet the standard demand of environmental emission in China, and the cloth bag dust collection device and method of the aluminium oxide roasting furnace can be used for replacing an existing electric dust collection and purification technology of the roasting furnace.
Description
Technical field
The present invention relates to a kind of dust arrester installation and method, be specifically related to a kind of alumina roasting furnace dust arrester installation and method of using bagroom.
Background technology
What alumina industry purifying fume from calcining furnace process adopted at present is all cottrell, but its use exists problems: 1, be subject to the restriction of its structure, principle, cannot catch aluminium oxide ultrafine particle, emissions concentration is all at 50 mg/m
3above, even higher.And in the < < aluminium emission of industrial pollutants standard > > that issues and implement on December 27th, 2013 of country, stipulate concentration of emission limit value 10 mg/Nm of the particle of alumina producer roaster
3, at all cannot be up to standard.2, in production process, hydroxide particle-size fluctuation is large, and when granularity refinement, electricity gathers dust and cannot meet the demands.3, electricity gathers dust, and to consume electric energy high, and operating cost is large, and fault is many, and efficiency of dust collection fluctuation is large, and maintenance cost is high.4, the most key, during roaster fluctuation, fuel combustion is not exclusively understood some CO gas and is entered in electric precipitation, meets when electricity gathers dust short circuit dischange and easily blasts, and has serious potential safety hazard.
Because aluminum oxide roasting furnace flue gas composition and operating mode are different from the special circumstances of other industry roaster, conventional bag collection technology cannot be suitable for, mainly there is following several respects technical barrier: 1, aluminum oxide roasting furnace flue gas temperature is higher, fluctuation is large, especially during fault stop jumping, flue-gas temperature can reach more than 300 ℃, adopts bag collection easily to cause cloth bag to burn out, and adopting special refractory glass fibre material to make cloth bag, the dustiness of outlet again cannot be up to standard.2, high, the high humidity of flue gas moisture in alumina roasting furnace, water content reaches more than 35%, especially adopt the alumina roasting furnace of coke-stove gas and fuelled with natural gas, smoke moisture is more up to more than 40%, control bad easy dewfall and cause cloth bag to harden can not to use, particularly when back-blowing, often because air quantity is large, can cause flue gas and the filter cloth contact-making surface temperature can be lower than dew point, after the time is long, filter cloth hardens.3, bagroom filtration pressure difference is larger, to roaster system negative pressure and blower fan, can impact, and reduces pressure reduction and can cause filter area to increase, and occupation of land and investment are increased considerably.4, aluminum oxide dust hardness is larger, the improper cloth bag that weares and teares that easily causes of filter process wind speed.Above problem, causes the conventional bag collection device can not extensive use in aluminum oxide roasting furnace flue gas purification process.Therefore, so far, metallurgical grade commercial alumina process for purifying fume from calcining furnace still adopts electric dust-collecting method.
Summary of the invention
Along with the development of bagroom technology and cloth bag material, its technology reaches its maturity.The features such as impact that bagroom has that efficiency of dust collection is high, good stability, operation, maintenance cost are low, be not subject to dust kind and import dustiness, meanwhile, bagroom inside is without electricity consumption facility, even CO exceeds standard in flue gas, can not blast yet, safe.
Object of the present invention is exactly the deficiency existing for existing technology, the particularity of combined aluminum oxide baking furnace fume operating mode, provide a kind of in aluminum oxide roasting furnace flue gas purification process, the operation of energy efficient stable, safety coefficient is high, exhaust emissions concentration can reach state environmental emissioning standard requirement alumina roasting furnace dust arrester installation and method.
The object of the invention is to be achieved through the following technical solutions.
An alumina roasting furnace dust arrester installation, is characterized in that, this dust arrester installation comprises:
Bagroom;
The first distributor, one end of this first distributor is connected with the exhanst gas outlet of roaster, the other end is connected with described bagroom by pipeline, this first distributor is a casing, a plurality of airflow-distribution boards are installed in casing, between adjacent airflow-distribution board, form import thin, export thick tapering trumpet-like passage;
The second distributor, one end of this second distributor is connected with described bagroom by pipeline, and the other end is connected with blower fan, and this second distributor is a casing;
Gray back pipeline, one end of this gray back pipeline is connected with described bagroom, and the other end is connected with roaster.
A kind of alumina roasting furnace dust arrester installation of the present invention, is characterized in that, the pipeline between described the first distributor and described bagroom is many, and the pipeline between described the second distributor and described bagroom is many.
A kind of alumina roasting furnace dust arrester installation of the present invention, it is characterized in that, in described bagroom, be provided with described the first distributor and described bagroom between the identical filter element of number of tubes, the pipeline between described the first distributor and described bagroom is communicated with respectively with described filter element.
A kind of alumina roasting furnace dust arrester installation of the present invention, is characterized in that, on the pipeline between described the first distributor and described bagroom, is provided with cold-air flap and temperature measuring equipment, this temperature measuring equipment with for controlling the control device of cold-air flap, be connected.
A kind of alumina roasting furnace dust arrester installation of the present invention, is characterized in that, described temperature measuring equipment is thermocouple thermometer or thermal resistance thermometer.
A kind of alumina roasting furnace dust arrester installation of the present invention, is characterized in that, described control device is PLC or DCS.
An alumina roasting furnace collecting method, is characterized in that, the method is used bagroom to gather dust.
An alumina roasting furnace collecting method, is characterized in that, the method is used above-mentioned alumina roasting furnace dust arrester installation to gather dust.
A kind of alumina roasting furnace collecting method of the present invention, is characterized in that, described bagroom inner filtration wind speed is 0.5-0.8m/min.
A kind of alumina roasting furnace collecting method of the present invention, is characterized in that, the inlet outlet pressure differential of described bagroom is 400-1000Pa.
Bag collection device of the present invention can substitute cottrell, and stable application is in alumina roasting furnace, and safety coefficient is high, and dust collection effect is good, and exhaust emissions concentration can reach the requirement of state environmental emissioning standard.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
The specific embodiment
Referring to Fig. 1, alumina roasting furnace dust arrester installation of the present invention comprises:
Bagroom 1, the first distributor 2, one end of the first distributor 2 is connected with the exhanst gas outlet of roaster 3, the other end is connected with bagroom 1 by pipeline, the first distributor 2 is a casing, and a plurality of airflow-distribution boards 10 are set in casing, between adjacent airflow-distribution board, form import thin, export thick tapering trumpet-like passage, its effect is to make flue gas stream enter comparatively uniformly each passage of bagroom, avoids flue gas inequality to cause certain filter element load that gathers dust excessive.The effect of the first distributor 2 is that the flue gas that assurance enters in bagroom 1 is realized uniform distribution.One end of the second distributor 4 is connected with bagroom 1 by pipeline, and for the flue gas after collection and purification, the other end of the second distributor 4 is connected with blower fan 5.A kind of alumina roasting furnace dust arrester installation of the present invention also comprises gray back pipeline 6, and its one end is connected with bagroom 1, and the other end is connected with roaster 3, and the material that gathers dust in bagroom 1 is back in roaster 3 by gray back pipeline 6, carries out after baking.Pipeline in alumina roasting furnace dust arrester installation between the first distributor 2 and bagroom 1 can be many, makes to need the flue gas purifying evenly and fast to enter in bagroom 1.Same, the pipeline between the second distributor 4 and bagroom 1 also can be many.
In bagroom 1, be provided with filter element, the quantity of this filter element is identical with the number of tubes between the first distributor 2 and bagroom 1, the connection that pipeline between the first distributor 2 and bagroom 1 is corresponding with filter element difference, be a plurality of filter element parallel operations, the flue gas entering in bagroom 1 by different pipelines can be filtered and be purified in the filter element corresponding with entering pipeline, has improved efficiency and the effect of gathering dust.
During work, the flue gas that alumina roasting furnace 3 produces enters the first distributor 2 from exhanst gas outlet, and under the effect of airflow-distribution board, carry out uniform distribution, by pipeline, enter in bagroom 1 subsequently, in filter element, purify, the flue gas purifying after up to standard enters in the second distributor 4 by another pipeline, discharges dust arrester installation subsequently under the effect of blower fan 5.The material that gathers dust in bagroom 1 is back in roaster 3 by gray back pipeline 6, carries out after baking.
In alumina roasting furnace dust arrester installation of the present invention, on the pipeline between the first distributor 2 and bagroom 1, be provided with cold-air flap 7 and temperature measuring equipment 8, this temperature measuring equipment 8 with for controlling the control device 9 of cold-air flap 7 intakes, be connected.Temperature measuring equipment 8 feeds back to control device 9 by the flue-gas temperature detecting, control device 9 compares measured temperature value and design temperature, automatically adjust the intake of cold-air flap 7, guarantee that bagroom 1 inlet temperature is no more than the desired temperature of cloth bag material, and be not less than close dew temperature, avoid cloth bag to burn out and smoke condensation.Temperature measuring equipment can be selected thermocouple thermometer or thermal resistance thermometer.Control device is PLC or DSC.
The back-blowing of bagroom adopts pulsation to be interrupted back-flushing technique, be that the cloth bag back-blowing time is very short, blow number of times more, by the discharging of system negative pressure, blowback air quantity each during cloth bag blowback is 1% of traditional air quantity, and blowback number of times can reach 60 beats/min, the cold blast rate that enters cloth bag during so each blowing is very little, there will not be dewfall phenomenon, but also guaranteed to unload grey effect, thereby thoroughly solve the technical barrier that causes filter cloth to harden greatly due to Fume moisture.
While using alumina roasting furnace dust arrester installation of the present invention to gather dust, bagroom 1 inner filtration wind speed is that 0.5-0.8m/min is advisable, and the inlet outlet pressure differential of bagroom 1 is controlled at 400-1000Pa, can realize the best combination of investment and effect.
Embodiment 1
1 tablecloth bag collector is installed in the 4# of Mou company alumina roasting furnace electric cleaner southern side, from the pipeline of 4# roaster electric precipitation import, draws part of smoke, with the pipeline of DN450, is connected with dust arrester installation entrance of the present invention.Through detecting, after gathering dust with collecting method of the present invention, emptying tail gas dust content can reach 10 mg/Nm
3below.Process conditions: filtration velocity 0.5m/min, during pressure reduction 400Pa, cloth bag inlet temperature 148-178 ℃, the average 4.05mg/Nm of outlet dustiness
3.
Embodiment 2
1 tablecloth bag collector is installed in the 4# of Mou company alumina roasting furnace electric cleaner southern side, from the pipeline of 4# roaster electric precipitation import, draws part of smoke, with the pipeline of DN450, is connected with dust arrester installation entrance of the present invention.Through detecting, after gathering dust with collecting method of the present invention, emptying tail gas dust content can reach 10 mg/Nm
3below.Process conditions: filtration velocity 0.8m/min, during pressure reduction 1000Pa, cloth bag inlet temperature 144-170 ℃, average 7.16 mg/Nm of outlet dustiness
3.
Claims (10)
1. an alumina roasting furnace dust arrester installation, is characterized in that, this dust arrester installation comprises:
Bagroom;
The first distributor, one end of this first distributor is connected with the exhanst gas outlet of roaster, the other end is connected with described bagroom by pipeline, this first distributor is a casing, a plurality of airflow-distribution boards are installed in casing, between adjacent airflow-distribution board, form import thin, export thick tapering trumpet-like passage;
The second distributor, one end of this second distributor is connected with described bagroom by pipeline, and the other end is connected with blower fan, and this second distributor is a casing;
Gray back pipeline, one end of this gray back pipeline is connected with described bagroom, and the other end is connected with roaster.
2. alumina roasting furnace dust arrester installation according to claim 1, is characterized in that, the pipeline between described the first distributor and described bagroom is many, and the pipeline between described the second distributor and described bagroom is many.
3. alumina roasting furnace dust arrester installation according to claim 1, it is characterized in that, in described bagroom, be provided with described the first distributor and described bagroom between the identical filter element of number of tubes, the pipeline between described the first distributor and described bagroom is communicated with respectively with described filter element.
4. alumina roasting furnace dust arrester installation according to claim 1, it is characterized in that, on pipeline between described the first distributor and described bagroom, be provided with cold-air flap and temperature measuring equipment, this temperature measuring equipment with for controlling the control device of cold-air flap, be connected.
5. alumina roasting furnace dust arrester installation according to claim 4, is characterized in that, described temperature measuring equipment is thermocouple thermometer or thermal resistance thermometer.
6. alumina roasting furnace dust arrester installation according to claim 4, is characterized in that, described control device is PLC or DCS.
7. an alumina roasting furnace collecting method, is characterized in that, the method is used bagroom to gather dust.
8. an alumina roasting furnace collecting method, is characterized in that, the method is used and gathered dust according to the alumina roasting furnace dust arrester installation one of claim 1-6 Suo Shu.
9. a kind of alumina roasting furnace collecting method according to claim 8, is characterized in that, described bagroom inner filtration wind speed is 0.5-0.8m/min.
10. a kind of alumina roasting furnace collecting method according to claim 8, is characterized in that, the inlet outlet pressure differential of described bagroom is 400-1000Pa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333373.0A CN104075583B (en) | 2014-07-15 | 2014-07-15 | A kind of alumina roasting furnace dust arrester installation and method |
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| CN201410333373.0A CN104075583B (en) | 2014-07-15 | 2014-07-15 | A kind of alumina roasting furnace dust arrester installation and method |
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| CN104075583A true CN104075583A (en) | 2014-10-01 |
| CN104075583B CN104075583B (en) | 2016-03-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495195A (en) * | 2016-12-05 | 2017-03-15 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN110094986A (en) * | 2018-01-31 | 2019-08-06 | 沈阳铝镁设计研究院有限公司 | Reduce the device of aluminum oxide roasting furnace flue gas dust concentration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5141734A (en) * | 1983-11-07 | 1992-08-25 | Aluminum Company Of America | Steam producing process |
| CN201032399Y (en) * | 2007-03-22 | 2008-03-05 | 中国铝业股份有限公司 | Kiln end dust collecting device of aluminum oxide calcin kiln |
| CN102743946A (en) * | 2012-07-10 | 2012-10-24 | 中国铝业股份有限公司 | Alumina calcination dust collecting system |
| 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
- 2014-07-15 CN CN201410333373.0A patent/CN104075583B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5141734A (en) * | 1983-11-07 | 1992-08-25 | Aluminum Company Of America | Steam producing process |
| CN201032399Y (en) * | 2007-03-22 | 2008-03-05 | 中国铝业股份有限公司 | Kiln end dust collecting device of aluminum oxide calcin kiln |
| CN102743946A (en) * | 2012-07-10 | 2012-10-24 | 中国铝业股份有限公司 | Alumina calcination dust collecting system |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495195A (en) * | 2016-12-05 | 2017-03-15 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN106495195B (en) * | 2016-12-05 | 2017-09-05 | 沈阳鑫博工业技术股份有限公司 | A kind of multifunctional roasting device and control method |
| CN110094986A (en) * | 2018-01-31 | 2019-08-06 | 沈阳铝镁设计研究院有限公司 | Reduce the device of aluminum oxide roasting furnace flue gas dust concentration |
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| CN104075583B (en) | 2016-03-30 |
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