CN101069872A - Method for removal of inhalable particles in coal - Google Patents
Method for removal of inhalable particles in coal Download PDFInfo
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- CN101069872A CN101069872A CN 200710020631 CN200710020631A CN101069872A CN 101069872 A CN101069872 A CN 101069872A CN 200710020631 CN200710020631 CN 200710020631 CN 200710020631 A CN200710020631 A CN 200710020631A CN 101069872 A CN101069872 A CN 101069872A
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Abstract
The present invention relates to a method for removing inhalable particulate matter from firing coal. Said method is characterized by that it includes the following steps: utilizing fluidized-bed aerosol generator to make magnetic seed with soft magnetic feature be aerocolloidized and be added into the dust-bearing flue gas of fired coal, then introducing the dust-bearing flue gas in which the magnetic seed is added into a high-gradient magnetic seed gathering trapping device, making the magnetic seed be combined fly ash inhalable particulate matter and can be adsorbed on the surface of magnetic medium, so that the flue gas can be cleaned and can be discharged to the exterior.
Description
Technical field
The present invention relates to the technology that inhalable particles in coal removes, belong to environmental pollution prevention and control and clean coal combustion technology field.
Background technology
The atmosphere pellet has become the outstanding problem of air environmental pollution, and causes the great attention of countries in the world day by day.It has been recognized that of the serious harm of atmosphere pellet, SO in the atmosphere to health
2, NO
xDo not get in touch closely with the content and the human death rate of pollutant such as CO, pellet then becomes the main cause that causes the human death rate to rise.Simultaneously, Atmospheric particulates also are the key factors that causes significant problems such as atmospheric visibility reduction, acid rain, Global climate change, smog episode, depletion of the ozone layer.The pellet of burning and exhausting is the main source of atmosphere pellet, has the material of harm also to come from Combustion Source usually in pellet most simultaneously.Thereby the technology that removes of Combustion Source pellet has been listed in one of research contents of state key basic research development plan.
At present, the dust arrester of commercial Application has wet method and dry method two big classes.
1. wet dedusting.Adopt the mode of washing to wash ash-laden gas, particulate separation is come out.This method exists material to be difficult to reclaim, easily to pollute shortcomings such as can causing energy dissipation under transfer (changing water into by atmosphere pollution pollutes) and the hot environment.
2. dry method dust mainly comprises cyclone dust collectors, sack cleaner and electrostatic precipitator.Bag-type dust and electrostatic precipitation belong to high-efficiency dust remover, but the resistance of sack cleaner is bigger, and the filtrate corrosion resistance is poor, need cleaned at regular intervals and replacing, and the maintenance cost height is used few in China.The electrostatic precipitator dust removing effects is not only relevant with grain diameter, but also relevant with the ratio resistance of particle, hangs down the removing that all is unfavorable for particle than too high in resistance with crossing.Cyclone dust collectors are because it is simple in structure, cheap, maintenance management convenient and suitable face width and being commonly used at each industrial circle.Because its separating mechanism is higher for the particle separation efficient that particle diameter is bigger based on inertial separation, but for micron order and sub-micron grade particle, its separating power is very low.
Although electrostatic precipitation and bag-type dust than the cyclone dust collectors height, are that the pellet elimination efficiency of 0.1 μ m-10 μ m very low for particle diameter to the arresting efficiency of small-particle.Current, the efficiency of dust collection of high-efficiency electrostatic dust remover can reach 99.9%, but 0.1% dust that deduster can't be removed mainly is a pellet.And these pellets just, its particle diameter is very little, and it is very low that mass concentration accounts for overall share, but number concentration very high (accounting for more than 90% of pm emission) causes huge harm to environment and human body.Therefore, must adopt new control method from the discharging of source control inhalable particles in coal.
Summary of the invention
Technical problem: the removal methods that the purpose of this invention is to provide a kind of inhalable particles in coal, this method can effectively be controlled the discharging of inhalable particles in coal, reduction is to the pollution of environment, elimination solves the problem that the traditional industry dust arrester can't remove substantially to inhalable particles in coal to the harm of human body.
Technical scheme: the removal methods of inhalable particles in coal of the present invention:
1) add the magnetic kind: adopt the fluid bed aerosol generator with the even aerosolized back of magnetic kind continuously, stable, controllably join in the ash-laden gas, enter high-gradient magnetic field magnetic kind coalescence capturing device after making the magnetic kind and inhalable particles in coal in the ash-laden gas mixing
2) the poly-and capture of High-gradient Magnetic kind: the flue gas that contains the magnetic kind enters in the poly-also capturing device of high-gradient magnetic field magnetic kind; Magnetic kind particle and fly ash particle are magnetized under the high gradient external magnetic field; Magnetization is relative motion and close magnetizing mediums under magnetic dipole power between particle and the effect of external magnetic field power afterwards; Do after the particle encounter of relative motion poly-and together; Form the bigger particle of particle diameter; Accelerate under the effect of the bulky grain outside magnetic field high gradient power of gathering and forming near magnetizing mediums; Finally be adsorbed in the magnetizing mediums surface; Flue gas after being cleaned is discharged from passage
3) electromagnetic rapping: the particle coalescence body that adopts electromagnetic rapping will be adsorbed on the magnetic medium shakes, and the particle coalescence body that falls that shakes enters the one-level ash bucket,
4) high-gradient magnetic separation: adopt the magnetic kind in the High-gradient Magnetic separation method separating granular coalescence body, it is carried out recycling,
The magnetic kind of adding is the ferromagnetic particle with soft magnetic characteristic.In the High-gradient Magnetic kind coalescence capturing device, magnetizing mediums is the ferromagnetism column medium with high magnetic permeability, and diameter is less than 0.2mm.In the High-gradient Magnetic kind coalescence capturing device, arrange many row's magnetizing mediums in the coalescence passage, adopt the stagger arrangement arrangement, transverse pitch is less than 4 times of magnetizing mediums diameters.In the High-gradient Magnetic kind coalescence capturing device, adding background magnetic field can be produced by electromagnet or permanent magnet, and two magnetic poles are symmetrically arranged in the passage both sides.High-gradient Magnetic kind coalescence capturing device, air velocity direction, magnetizing mediums axis direction, to add the background magnetic field direction mutually vertical in three dimensions.In the electromagnetic rapping, the rapping mode is the batch (-type) rapping.The magnetic kind reclaims, and adopts the magnetic kind in the High-gradient Magnetic separate mode recovery particle.
Beneficial effect:
1. adopt high-gradient magnetic field magnetic kind coalescence capturing device, can effectively remove the pellet in the coal-fired flue-gas, removal efficiency can reach on 80%.
2. the magnetic kind is reclaimed in the high-gradient magnetic field magnetic separation, effectively reduces investment and operating cost.
3. this technological process is simple, and equipment is few, and floor space is little.
Description of drawings
Fig. 1 adds the magnetic kind to realize inhalable particles in coal coalescence removing process flow chart in the high-gradient magnetic field; Fig. 2 is that high-gradient magnetic field magnetic kind coalescence capturing device is arranged schematic diagram.Magnetic pole 1. passages 2. magnetizing mediums 3. magnetic poles 4 are wherein arranged.
The specific embodiment
The present invention will be described below in conjunction with accompanying drawing:
Fig. 1 is technological process of the present invention, the ash-laden gas that coal combustion produces is before entering high-gradient magnetic field magnetic kind coalescence capturing device, the aerosolized back of ferromagnetic particle of adopting the fluid bed aerosol generating device will have soft magnetic characteristic feeds in the flue gas, enters high-gradient magnetic field magnetic kind aggregation device after fully mixing.Under the effect of high-gradient magnetic field, magnetic kind particle and the fly ash particle coalescence that bumps, particle diameter is grown up, and is finally caught by magnetizing mediums.Remove the direct emptying of flue gas of particle.In the capture process of particle, adopt batch (-type) electromagnetic rapping mode, the particle that is adsorbed in the magnetizing mediums surface is shaken, make it fall into the one-level ash bucket.Owing to contain a certain amount of magnetic kind in the ash in the one-level ash bucket, for effectively reducing operating cost, adopt the High-gradient Magnetic separate mode that the magnetic kind is separated again and utilize, the flying dust after the separation directly enters the secondary ash bucket.
Fig. 2 is that high-gradient magnetic field magnetic kind coalescence capturing device is arranged schematic diagram.This capturing device is made up of passage, magnetic pole and magnetizing mediums, and two magnetic poles are symmetrically arranged in the passage both sides, and air velocity direction, magnetizing mediums axis direction, to add the background magnetic field direction mutually vertical in three dimensions.
Adopt the fluid bed aerosol generator, the aerosolized back of magnetic kind particle is fed in the ash-laden gas, magnetic kind uniform particles is distributed in the flue gas.The flue gas that contains the magnetic kind enters in the high-gradient magnetic field magnetic kind coalescence capturing device, and magnetic kind particle and fly ash particle are magnetized under the effect of high gradient external magnetic field, and the magnetization back is relative motion and close magnetizing mediums under magnetic dipole power between particle and the effect of external magnetic field power.Coalescence forms the bigger particle of particle diameter together after doing the particle encounter of relative motion, has not only strengthened magnetic dipole power between particle, and external magnetic field power also increases, thereby promoted the coalescence of particle, the particle diameter larger particles of formation is easier to be caught by magnetizing mediums, is adsorbed in the magnetizing mediums surface.Flue gas after being cleaned is discharged from passage.Along with the seizure of magnetizing mediums to particle, its surperficial particle increases gradually, adopts batch (-type) electromagnetic rapping mode, and the particle that is adsorbed in the magnetizing mediums surface is shaken, and enters the one-level ash bucket.Owing to contain a certain amount of magnetic kind in the flying dust that removes, for reducing operating cost, the ash in the one-level ash bucket is fed in the high-gradient magnetic separation device, magnetic kind separate particles is wherein come out, utilize again.Flying dust after the separation directly enters the secondary ash bucket.
When adopting this PROCESS FOR TREATMENT coal-fired flue-gas, preferred version is: air velocity is 0.1m/s-0.5m/s in the high-gradient magnetic field magnetic coalescence capturing device; The magnetizing mediums diameter is less than 0.2mm, and the magnetizing mediums spacing is less than 0.4mm, and magnetizing mediums arranges that row's number is no less than 20 rows; Adding the background magnetic field magnetic flux density is 4000-5000 Gauss; It is 0.02-0.06 that the magnetic kind is added mass ratio (magnetic kind and flying dust mass concentration ratio).
Claims (8)
1. the removal methods of an inhalable particles in coal is characterized in that this method that removes particle is:
1) add the magnetic kind: adopt the fluid bed aerosol generator with the even aerosolized back of magnetic kind continuously, stable, controllably join in the ash-laden gas, enter high-gradient magnetic field magnetic kind coalescence capturing device after making the magnetic kind and inhalable particles in coal in the ash-laden gas mixing
2) the poly-and capture of High-gradient Magnetic kind: the flue gas that contains the magnetic kind enters in the poly-also capturing device of high-gradient magnetic field magnetic kind; Magnetic kind particle and fly ash particle are magnetized under the high gradient external magnetic field; Magnetization is relative motion and close magnetizing mediums under magnetic dipole power between particle and the effect of external magnetic field power afterwards; Do after the particle encounter of relative motion poly-and together; Form the bigger particle of particle diameter; Accelerate under the effect of the bulky grain outside magnetic field high gradient power of gathering and forming near magnetizing mediums; Finally be adsorbed in the magnetizing mediums surface; Flue gas after being cleaned is discharged from passage
3) electromagnetic rapping: the particle coalescence body that adopts electromagnetic rapping will be adsorbed on the magnetic medium shakes, and the particle coalescence body that falls that shakes enters the one-level ash bucket,
4) high-gradient magnetic separation: adopt the magnetic kind in the High-gradient Magnetic separation method separating granular coalescence body, it is carried out recycling,
2. the removal methods of inhalable particles in coal according to claim 1 is characterized in that the magnetic kind of adding is the ferromagnetic particle with soft magnetic characteristic.
3. the removal methods of inhalable particles in coal according to claim 1 is characterized in that in the High-gradient Magnetic kind coalescence capturing device, magnetizing mediums is the ferromagnetism column medium with high magnetic permeability, and diameter is less than 0.2mm.
4. the removal methods of inhalable particles in coal according to claim 1 is characterized in that in the High-gradient Magnetic kind coalescence capturing device, arranges many row's magnetizing mediums in the coalescence passage, adopts the stagger arrangement arrangement, and transverse pitch is less than 4 times of magnetizing mediums diameters.
5. the removal methods of inhalable particles in coal according to claim 1 is characterized in that in the High-gradient Magnetic kind coalescence capturing device, and adding background magnetic field can be produced by electromagnet or permanent magnet, and two magnetic poles are symmetrically arranged in the passage both sides.
6. the removal methods of inhalable particles in coal according to claim 1 is characterized in that High-gradient Magnetic kind coalescence capturing device, and air velocity direction, magnetizing mediums axis direction, to add the background magnetic field direction mutually vertical in three dimensions.
7. the removal methods of inhalable particles in coal according to claim 1 is characterized in that in the electromagnetic rapping, and the rapping mode is the batch (-type) rapping.
8. the removal methods of inhalable particles in coal according to claim 1 is characterized in that the magnetic kind reclaims, and adopts the magnetic kind in the High-gradient Magnetic separate mode recovery particle.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200710020631XA CN100509168C (en) | 2007-03-16 | 2007-03-16 | Method for removal of inhalable particles in coal |
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| CNB200710020631XA CN100509168C (en) | 2007-03-16 | 2007-03-16 | Method for removal of inhalable particles in coal |
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| CN101069872A true CN101069872A (en) | 2007-11-14 |
| CN100509168C CN100509168C (en) | 2009-07-08 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850298A (en) * | 2010-06-02 | 2010-10-06 | 江苏旌凯中科超导高技术有限公司 | Method for improving mineral separation capacity of magnetic separation device |
| CN101530827B (en) * | 2009-04-12 | 2011-04-13 | 赵尚武 | A dedusting method with magnetic force |
| US9387486B2 (en) | 2014-09-30 | 2016-07-12 | Ut-Battelle, Llc | High-gradient permanent magnet apparatus and its use in particle collection |
| CN107138272A (en) * | 2017-04-24 | 2017-09-08 | 航天凯天环保科技股份有限公司 | One kind spraying waste gas magnetic purifying method and device |
| CN107321177A (en) * | 2017-07-13 | 2017-11-07 | 华中科技大学 | A kind of method of the steady bed joint removing sintering various pollutants in fume of utilization magnetic |
| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN108816513A (en) * | 2018-05-30 | 2018-11-16 | 上海电力学院 | Multistage alternation catching type magnetic force dust-precipitating system |
| CN111495097A (en) * | 2020-04-16 | 2020-08-07 | 东南大学 | Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field |
-
2007
- 2007-03-16 CN CNB200710020631XA patent/CN100509168C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530827B (en) * | 2009-04-12 | 2011-04-13 | 赵尚武 | A dedusting method with magnetic force |
| CN101850298A (en) * | 2010-06-02 | 2010-10-06 | 江苏旌凯中科超导高技术有限公司 | Method for improving mineral separation capacity of magnetic separation device |
| CN101850298B (en) * | 2010-06-02 | 2012-06-13 | 江苏旌凯中科超导高技术有限公司 | Method for improving mineral separation capacity of magnetic separation device |
| US9387486B2 (en) | 2014-09-30 | 2016-07-12 | Ut-Battelle, Llc | High-gradient permanent magnet apparatus and its use in particle collection |
| CN107138272A (en) * | 2017-04-24 | 2017-09-08 | 航天凯天环保科技股份有限公司 | One kind spraying waste gas magnetic purifying method and device |
| CN107321177A (en) * | 2017-07-13 | 2017-11-07 | 华中科技大学 | A kind of method of the steady bed joint removing sintering various pollutants in fume of utilization magnetic |
| CN108704762A (en) * | 2018-05-07 | 2018-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process |
| CN108816513A (en) * | 2018-05-30 | 2018-11-16 | 上海电力学院 | Multistage alternation catching type magnetic force dust-precipitating system |
| CN111495097A (en) * | 2020-04-16 | 2020-08-07 | 东南大学 | Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field |
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| CN100509168C (en) | 2009-07-08 |
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