CN1242830C - Acceleration method of birdnesting ultrafine partieles of coal and equipment - Google Patents
Acceleration method of birdnesting ultrafine partieles of coal and equipment Download PDFInfo
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- CN1242830C CN1242830C CN 200410013001 CN200410013001A CN1242830C CN 1242830 C CN1242830 C CN 1242830C CN 200410013001 CN200410013001 CN 200410013001 CN 200410013001 A CN200410013001 A CN 200410013001A CN 1242830 C CN1242830 C CN 1242830C
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Abstract
The present invention relates to a method for accelerating aggregation of ultrafine particles of coal and a device for the method, which belongs to the technical fields of energy sources and environmental technology. In order to solve the problem of pollution of smoke and dust of the coal, the present invention is characterized in that under the condition without changing the existing dust removing equipment and parameters, large equipment is not increased, and a large amount of investment is not needed; 0.05% of water and 2.5% of an aggregation accelerating agent are mixed by a liquid distributing pump or a mixer, the solution is conveyed into a smoke channel in the front of an electrostatic precipitator through pressure of an air compressor by a double-flow atomizer to form fog cloud whose surface has high adhesive activity, the surfaces of fly ash particles are adsorbed by the fog cloud, liquid bridges are generated among the particles, and then, the liquid bridges are converted into solid bridges to accelerate the aggregation of the particles. Thus, the removing efficiency of ESP for the ultrafine particles is improved, the purpose which only can be achieved by using a bag type dust remover to displace the ESP is achieved, the discharge amount of the smoke and the dust is reduced, and the atmospheric environment is improved.
Description
Technical field
The invention belongs to the energy and environment technical field, relate under existing electrostatic precipitator in coal-fired power plant condition, reduce a kind of new method of smoke dust discharge concentration.
Background technology
The current and expected future long duration, China all was the country of consumption of coal in the world and output maximum, and coal production was nearly 1,400,000,000 tons in 2002, surpassed 1,600,000,000 tons in 2003, and the year two thousand twenty coal production is estimated to reach hundred million tons of 25-33.The china natural resources characteristics have determined can not change for a long time based on the energy resource structure of coal.And coal accounts for significant proportion in primary energy consumption, up to about 65%.The problem of environmental pollution that China's fire coal causes is quite serious, and flue dust 90% comes spontaneous combustion coal, calendar year 2001 smoke discharge amount reach 1059.1 ten thousand tons.2002, in 343 cities of institute's monitoring and statistics, there is 2/3 urban air-quality to surpass national grade ii standard, 107 urban air-qualities are inferior to national grade III Standard.Particle has carcinogenic, teratogenesis and mutagenic effect to health in the atmosphere, is the one of the main reasons that causes the human death rate to rise, and simultaneously, also is the key factor of bringing out major events such as Global climate change, smog episode, depletion of the ozone layer.UNEP's " global environment prospect in 2002 " points out that in 11 largest city of China, coal smoke and fine particle pollute, and people more than 50,000 is died young, and more than 40 ten thousand people infect chronic bronchitis.Because industrial development, its resident's lung cancer mortality rises to 35.79/10 ten thousand by 5.25/10 ten thousand from nineteen sixty to 1979 year in Shanghai City, rises 6.8 times approximately in the period of 20; PM
10Pollution all is conspicuousness positive correlation, i.e. PM to when flu cough, bronchitic influence
10Pollute heavyly more, two kinds of disease incidences are high more; Pulmonary Function in Children increases the weight of along with air pollution and descends, and the incidence of children's expectoration, cough symptom is linear to be increased; Each city proper lung cancer mortality and the total air suspended particulates relation of being proportionate in recent years; China's neonatal incidence of disease in congenital malformation in chimney of electric plant prevailing wind direction downwind side residential block is apparently higher than clean area, and near more apart from power plant, and the lopsided incidence of disease is high more, and wherein Pai Fang particle plays important toxic action.Particle also produces great influence to atmospheric visibility, also is the significant contribution person of Atmospheric Photochemical Smog, acid deposition.The annual low visibility in Beijing is in by the fifties 60 days of the fate of 4km, and to the seventies 150 days increase to 180 days to the eighties, reach 203 days in 1994.
At present, the dust arrester that the large coal-fired boiler unit equipment of China more than 90% adopts is an electrostatic precipitator, though the efficiency of dust collection of electrostatic precipitator can be up to more than 99%, but electrostatic precipitator is lower to the capture rate of superfine particulate matter, still have a large amount of superfine particulate matters to enter in the atmosphere, superfine particulate matter enrichment simultaneously many toxic heavy metal components, to human and environmental hazard is bigger.Therefore, how effectively the discharging of the ultra-fine flue dust in the coal-fired back of control has become one of present pollution that caused by coal burning urgent problem.
Summary of the invention
In order to solve the problem of above-mentioned existence, the invention provides a kind of coal-fired superfine particulate matters reunion promotion method, improve the efficiency of dust collection of electrostatic precipitator by promoting superfine particulate matter to reunite, reach the method that reduces smoke dust discharge concentration from source superfine particulate matter content.
A kind of coal-fired superfine particulate matters reunion promotion method of the present invention, order comprises the steps: (1). by dosing pump or blender agglomeration promotor and water fully mixed; (2). mix back agglomeration promotor solution by in the flue of the pressure of air compressor before double-current atomizer is sent into electrostatic precipitator, form the mist cloud that the surface has higher adhesion activity.
Described coal-fired superfine particulate matters reunion promotion method, described agglomeration promotor accounts for the mass percent of water between 0.05%～2.5%; It is 0.05%～1% that the agglomeration promotor liquid inventory accounts for the flue gas flow percent by volume, makes its influence to flue-gas temperature be no more than 20 ℃.
Described coal-fired superfine particulate matters reunion promotion method, described agglomeration promotor can fully mix the mixture that the back forms with the phosphoric acid solution of mass percent concentration 0.5-5% according to mass ratio for the xanthan gum solution of mass percent concentration 0.1-1.0% at 1: 1.
A kind of coal-fired superfine particulate matters of the present invention is reunited and is promoted device, comprises fluid reservoir, mixing chamber, air compressor, double-current atomizer; Mixing-chamber inlet is connected with water for industrial use with fluid reservoir respectively by pipeline, and mixing chamber outlet, air compressor are connected with double-current atomizer by pipeline; The agglomeration promotor that flows out from fluid reservoir is atomized by double-current atomizer by the pressure-air that air compressor produces at mixing chamber and the abundant mixed solution of water for industrial use.During use, double-current atomizer places the flue before the electrostatic precipitator.
Described coal-fired superfine particulate matters is reunited and is promoted device, can be provided with measuring pump between described fluid reservoir and the mixing chamber, controls its flow from the agglomeration promotor that fluid reservoir flows out by measuring pump, mixes with water for industrial use at mixing chamber again.
Coal-fired superfine particulate matters reunion promotion method of the present invention, the agglomeration promotor that sprays into is formed with certain diffusion angle and surperficial mist cloud with higher adhesion activity after fragmentation under the double-current atomizer effect of brute force, the mist cloud is adsorbed in the fly ash granule surface, between particle, produce the liquid bridge, in the back-end ductwork before deduster, and then be converted into Gu Qiao, promote particle agglomeration, make fine particle form bigger poly-group, and fine particle is adsorbed by coarse granule, thereby improve the efficiency of dust collection of ESP, improve atmospheric environment.
The invention has the advantages that:
1. the present invention enables to be removed under the effect of electrostatic precipitator mainly by before electric dust collector superfine particulate matter being reunited, and can carry out not influencing the burning operating condition and do not change under the condition of deduster parameter.
2. package unit of the present invention comprises equipment such as powerful double-current atomizer, dosing pump, blender and fluid reservoir, and structure is simple relatively, and cost is lower, takes up an area of to lack, and has the possibility in industrial large-scale application.
3. can improve the removal efficiency of electrostatic precipitator by method provided by the invention, reduce the discharging of ultra-fine flue dust, reach the target that just can reach with sack cleaner displacement ESP to superfine particulate matter.
The particle that adopts this method to handle to make ultra-fine flue dust be agglomerated into greater particle size, and removed by electrostatic precipitator can be under the condition of duty that does not influence electrostatic precipitator and collection mode, reaches to reduce in the waste gas dust concentration more than 20%.
Description of drawings
Fig. 1 method of the present invention is specifically implemented schematic diagram;
Fig. 2 device of the present invention constitutes schematic diagram;
The schematic diagram of Fig. 3 double flowing nozzle.
The specific embodiment
Fig. 1 represents that the used method of the present invention is that back-end ductwork before the electrostatic precipitator sprays into agglomeration promotor.Fig. 2 represents that device of the present invention constitutes schematic diagram, device of the present invention is made up of fluid reservoir, measuring pump, mixing chamber, air compressor, double flowing nozzle etc., as can be seen from the figure, control its flow from the agglomeration promotor that the promoter fluid reservoir flows out by measuring pump, and sent in the flue before the electrostatic precipitator by the crunch of air compressor, thereby flue dust is produced agglomeration with the abundant mixed solution of water for industrial use.
Fig. 3 is the double flowing nozzle schematic diagram, and it comprises spout-1, filtering plug-2, and fluid reservoir (oil pump) tube connector-3, air compressor tube connector-4, nozzle housing-5, material are brass, air admission hole-6, inlet opening-7, mixing chamber-8.
The on-the-spot layout is to arrange a series of double-current atomizers before electrostatic precipitator in coal-fired power plant in the back-end ductwork.The dust concentration that this reunion promotion method at first can be produced according to the boiler actual operating mode, control effectively by the flow of measuring pump to agglomeration promotor in the fluid reservoir, fully mix with industry water then and dissolve and form accelerator solution, wherein promoter account for water the mass concentration scope between 0.05%～2.5%, the volume flow of the agglomeration promotor solution of ejection accounts for 0.05%～1.0% of flue gas volume flow; At last, before accelerator solution is sent into electrostatic precipitator by the crunch of air compressor, have in the flue of uniform temperature (about 300 degree), the agglomeration promotor that sprays into simultaneously is formed with certain diffusion angle under the double-current atomizer effect of brute force after fragmentation and the surface has the mist cloud of higher adhesion activity, and the average grain diameter that atomizing produces is generally in the scope of 20-50um.The mist cloud is adsorbed in the fly ash granule surface, between particle, produce the liquid bridge, under flue-gas temperature, water evaporates in the atomizing particle, particle diameter diminishes gradually, active force between the particle is converted into Gu Qiao, and fine particle is closely linked more, forms bigger poly-group, perhaps fine particle is adsorbed by coarse granule, fine particle is reduced, improve the efficiency of dust collection of electric cleaner, reduce soot emissions.
1. as an embodiment of device of the present invention:
Fluid reservoir adopts the stainless steel fluid reservoir of YE-50 type, and size is 400*400mm, and volume is 50 liters, band water level meter, devices such as bleeder valve.
Air compressor adopts the air compressor of DC1051A type, and capacity is 0.036m
3/ min, pressure are 0.8Mpa, and power is 550W.
It is LMI Electromagnetic Drive diaphragm metering pump that mixing chamber and measuring pump adopt full name, and model: P026/P126, power are 22W.
2. as the embodiment of method of the present invention:
Used agglomeration promotor is 0.5% xanthan gum solution and 1% 1: 1 mixture of phosphoric acid solution, sprays into according to the concentration of 1% (mass ratio), and when the agglomeration promotor solution that sprays into accounts for 1.2 ‰ of flue gas volume flow, the reunion rate is about 10%; When the agglomeration promotor solution that sprays into account for the flue gas volume flow 2.3 ‰ the time, agglomeration promotor can reach 20% to the reunion efficient of ultra-fine grain, flue-gas temperature descends 5 ℃; When the agglomeration promotor solution that sprays into account for the flue gas volume flow 4.2% the time, the reunion efficient of agglomeration promotor can reach 35%, temperature reduces about 10 ℃ approximately.
According to the phosphoric acid solution of the xanthan gum solution of variable concentrations, variable concentrations with spray into the agglomeration promotor solution of different flow, obtained reunion efficient to ultra-fine flue dust is also different, but its best reunion efficient can reach 70%.Generally speaking, xanthans concentration is higher in the agglomeration promotor solution that sprays into, and agglomeration promotor liquor capacity flow (atomizing back) when accounting for the 0.05-1.0% of flue gas volume flow, the reunion effect is relatively good, the reunion rate can reach more than 20%.The reunion effect that the agglomeration promotor solution that now illustrates different proportionings sprays into behind the horizontal flue sees the following form.
1. be 0.1% xanthan gum solution and 0.5% 1: 1 mixture of phosphoric acid solution;
2. be 1.0% xanthan gum solution and 5% 1: 1 mixture of phosphoric acid solution.
| Solution accounts for 1.0% of flue gas volume | Solution accounts for 0.05% of |
|||||
| 1 with the proportioning of water be 0.05% | 1 with the proportioning of water be 0.1% | 1 with the proportioning of water be 2.5% | 1 with the proportioning of water be 0.05% | 1 with the proportioning of water be 0.1% | 1 with the proportioning of water be 2.5% | |
| The reunion rate | 3％ | 5％ | 60％ | 0.2％ | 0.5％ | 6％ |
| Solution accounts for 1.0% of flue gas volume | Solution accounts for 0.05% of |
|||||
| 2 with the proportioning of water be 0.05% | 2 with the proportioning of water be 0.1% | 2 with the proportioning of water be 2.5% | 2 with the proportioning of water be 0.05% | 2 with the proportioning of water be 0.1% | 2 with the proportioning of water be 2.5% | |
| The reunion rate | 20％ | 35％ | 70％ | 1％ | 2.5％ | 40％ |
Claims (1)
1. a coal-fired superfine particulate matters reunion promotion method comprises the steps: (1) in proper order. by dosing pump or blender agglomeration promotor and water are fully mixed; (2). mix back agglomeration promotor solution by in the flue of the pressure of air compressor before double-current atomizer is sent into electrostatic precipitator, form the mist cloud that the surface has higher adhesion activity; Described agglomeration promotor is that the xanthan gum solution of mass percent concentration 0.1-1.0% fully mixes the mixture that the back forms with the phosphoric acid solution of mass percent concentration 0.5-5% according to mass ratio at 1: 1; Described agglomeration promotor accounts for the mass percent of water between 0.05%～2.5%; It is 0.05%～1% that the agglomeration promotor liquid inventory accounts for the flue gas flow percent by volume, makes its influence to flue-gas temperature be no more than 20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013001 CN1242830C (en) | 2004-04-10 | 2004-04-10 | Acceleration method of birdnesting ultrafine partieles of coal and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013001 CN1242830C (en) | 2004-04-10 | 2004-04-10 | Acceleration method of birdnesting ultrafine partieles of coal and equipment |
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| Publication Number | Publication Date |
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| CN1562444A CN1562444A (en) | 2005-01-12 |
| CN1242830C true CN1242830C (en) | 2006-02-22 |
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| CN 200410013001 Expired - Fee Related CN1242830C (en) | 2004-04-10 | 2004-04-10 | Acceleration method of birdnesting ultrafine partieles of coal and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513583B (en) * | 2009-02-16 | 2012-07-04 | 华中科技大学 | Coal-fired ultrafine grain chemical agglomeration promotor |
Families Citing this family (11)
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|---|---|---|---|---|
| CN1935384B (en) * | 2005-09-20 | 2010-09-08 | 深圳市豪恩电声科技有限公司 | Electrostatic fog remover and electro static fog-removing method |
| CN102416359A (en) * | 2011-09-03 | 2012-04-18 | 盐城市劲风节能环保设备有限公司 | Equipment for removing dust by using magnetic fluid and application thereof as well as method for removing dust in air by using equipment |
| CN102380278B (en) * | 2011-09-22 | 2014-04-16 | 东南大学 | Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method |
| CN102416363A (en) * | 2011-12-16 | 2012-04-18 | 江苏瑞帆环保装备股份有限公司 | Dust removal method and device based on chemical agglomeration and split linked anode electric dust removal |
| CN102513211A (en) * | 2011-12-16 | 2012-06-27 | 江苏瑞帆环保装备股份有限公司 | Method for quenching and tempering dust of sintering machine head and special device thereof |
| CN103977698B (en) * | 2014-05-23 | 2016-03-23 | 东南大学 | A kind of wet desulfurization system that reduces exports PM 2.5and SO 2the method of discharge |
| CN104043527B (en) * | 2014-06-30 | 2017-05-24 | 山东大学 | Surface membrane coagulation technology and device for efficiently removing fire coal flying ash microspheres |
| CN104069712A (en) * | 2014-07-06 | 2014-10-01 | 盐城工学院 | Chemical coagulation-based 'electricity-bag' integrated compound dust removing process |
| US10526556B2 (en) * | 2017-05-16 | 2020-01-07 | Omnis Mineral Technologies, Llc | Agglomeration of ultra-fine coal particles |
| CN108607315A (en) * | 2018-05-15 | 2018-10-02 | 武汉理工大学 | A kind of single solute component chemical floc and its preparation, application method for gas-particle separation |
| CN109364678B (en) * | 2018-12-26 | 2021-06-25 | 宁波大红鹰学院 | Device for promoting agglomeration of ultrafine particles in coal-fired flue gas |
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2004
- 2004-04-10 CN CN 200410013001 patent/CN1242830C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513583B (en) * | 2009-02-16 | 2012-07-04 | 华中科技大学 | Coal-fired ultrafine grain chemical agglomeration promotor |
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| CN1562444A (en) | 2005-01-12 |
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