CN102699013B - Pulverized fuel ash comprehensive treatment technique - Google Patents
Pulverized fuel ash comprehensive treatment technique Download PDFInfo
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- CN102699013B CN102699013B CN201210152211.8A CN201210152211A CN102699013B CN 102699013 B CN102699013 B CN 102699013B CN 201210152211 A CN201210152211 A CN 201210152211A CN 102699013 B CN102699013 B CN 102699013B
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Abstract
The invention relates to a pulverized fuel ash comprehensive treatment technique and belongs to the comprehensive treatment technology of pulverized fuel ash discharged by power plants in wet method. The pulverized fuel ash comprehensive treatment technique includes procedures of grading, flotation, natural settling, fine carbon concentration filter pressing, low carbon concentration filter pressing and drying for sorting. Wet pulverized fuel ash enters the grading procedure, +0.045mm pulverized fuel ash enters the natural settling procedure, and coarse pulverized fuel ash is obtained. -0.045mm pulverized fuel ash directly enters the flotation procedure, flotation fine carbon enters the fine carbon concentration filter pressing procedure to obtain fine carbon cakes, flotation low carbon pulverized fuel ash respectively enters the low carbon concentration filter pressing procedure and the drying for sorting procedure to obtain superfine pulverized fuel ash and I grade pulverized fuel ash. The pulverized fuel ash comprehensive treatment technique has the advantages that by aid of the grading procedure, ore grinding is not needed, and comprehensive utilization ratio of pulverized fuel ash is high; system water is recycled and water resources are saved; and the pulverized fuel ash comprehensive treatment technique is simple in process flow, small in device investment and low in energy consumption and maintenance expanse.
Description
Art
The present invention relates to a kind of flyash comprehensive processing technological process, belong to power plant's wet method discharge flyash comprehensive treatment technique.
Background technology
Flyash be coal dust through coal-burning boiler high-temp combustion, and the finely divided shape solid waste based on glassy phase produced after there is series of physical chemical reaction.
According to relevant statistics: average carbon content (loss on ignition) about 11% in China's partial fuel coal fly ash in electric power plant, do not meet the requirement of GB1596-2005I level flyash loss on ignition, moreover the charcoal in flyash is one of its key factor utilized further of restriction; What in flyash, fineness was on average greater than 0.045mm accounts for 40%, does not meet the requirement of GB1596-2005I level fineness of pulverized-coal ash.
The method of current domestic ore grinding has two kinds: wet milling and dry method grinding.
According to relevant statistics, China's partial fuel coal fly ash in electric power plant main chemical is silica, alundum (Al2O3), di-iron trioxide, on average account for 48%, 27%, 7% respectively, average Mohs hardness is respectively 7,8.8,6, belong to difficult-to-grind materials, no matter adopt wet milling or dry method grinding, have the following disadvantages: 1) equipment investment is large, energy consumption is high, efficiency is low; 2) equipment attrition is fast, maintenance cost is high.
According to interrelated data Synthesize estimation, within 2010, China's flyash discharge capacity reaches 2.0 hundred million tons, and due to reasons such as carbon content are high, granularity is large, total utilization of PCA rate is low.In order to effectively make good use of these wet fly-ashes, allow it turn waste into wealth, thus reach both energy-saving and emission-reduction, again the object of protection of the environment, be necessary to design a kind of flyash comprehensive processing technological process.
Summary of the invention
The object of the invention is to overcome prior art weak point, a kind of simple, energy-conservation flyash comprehensive processing technological process is provided.
A kind of flyash comprehensive processing technological process of the present invention: comprise classification operation, flotation circuit, natural subsidence operation, smart charcoal concentrates press filtration operation, low charcoal concentrates press filtration operation, dry sorting operation.
Described classification operation: by wet fly-ash by classifying equipoment classification, the flyash of+0.045mm enters the bevel deposition pond of subsequent processing; The flyash of-0.045mm directly enters the floatation equipment of subsequent processing.
The flyash of described flotation circuit :-0.045mm is after floatation equipment flotation, and flotation essence charcoal enters in the smart charcoal concentrator of subsequent processing; Flotation low powdered carbon coal ash directly enters in the low charcoal concentrator of subsequent processing.
Described smart charcoal concentrates press filtration operation: certainly flow to that concentrate charcoal slurry in smart charcoal concentrator is concentrated through concentrator, after filtering equipment press filtration, filtrate water directly recycles as system water, and obtain the smart charcoal cake that moisture is 23%, be used for boiler combustion or preparing active carbon etc. as fuel.
Described low charcoal concentrates press filtration operation: certainly flow to that low powdered carbon coal ash paste in low charcoal concentrator is concentrated through concentrator, after filtering equipment press filtration, filtrate water directly recycles as system water, and obtaining the low powdered carbon coal ash cake that moisture is 23%, low powdered carbon coal ash cake enters in the drying plant of subsequent processing after fragmentation.
Described oven dry sorting operation: enter that low powdered carbon coal ash in drying plant is dried through drying plant, after the classification of screening installation fineness, obtain superfined flyash and I level flyash that moisture is less than 1%.
The main application of superfined flyash: the method 1) quoting " high-mark cement+flyash in great mixed amount+high efficiency water reducing agent " that developing in the world, produces high-grade concrete; 2) as the inserts of plastics, rubber etc.; 3) insulation material, flyash combined high temperature ceramic coating etc. is made.
The main application of I level flyash and effect: be applicable to prepare pump concrete, mass concrete, impervious structural concrete, sulfate resistance concrete, anti-soft water corrosion concrete, Underwater Engineering concrete, prepakt concrete and roller compacted concrete.Adding coal ash in concrete, has saved a large amount of cement and fine aggregate; Decrease water consumption; Improve the workability of concrete batching system; The pumpability of Concrete Structure; Decrease concrete creeping; Reduce the heat of hydration, heat energy dilatancy; Improve concrete impervious ability; Increase concrete ground modified.
Described natural subsidence operation: enter the flyash of+0.045mm in bevel deposition pond after cement inclined-plane natural subsidence, precipitation water directly recycles as system water, and the reject fly ash that solid content is greater than 75%, as road-making material (embankment, sub-surface, road surface) or backfilling material (structure backfill, building backfill, fill out low-lying land and wasteland, filling mine, Subsidence Land in Coal Mining Area, building factory ditch), also can as the admixture of flyash brick, fly ash building block, weight flyash clay sintered brick.Flyash is as building the road or backfilling material, and equipment investment is little, instant effect.
The invention has the beneficial effects as follows:
1) by classification operation, do not need ore grinding, total utilization of PCA rate is high, turns waste into wealth;
2) system water recycles, saving water resource;
3) technological process is simple, equipment investment is little, energy consumption is low, maintenance cost is low.
Accompanying drawing explanation
Accompanying drawing is the process chart of a kind of flyash comprehensive processing technological process of the present invention.
1-wet fly-ash 2-classification operation 3-flotation circuit 4-essence charcoal concentrates the low charcoal of press filtration operation 5-essence charcoal cake 6-natural subsidence operation 7-and concentrates press filtration operation 8-oven dry sorting operation 9-superfined flyash 10-I level flyash 11-reject fly ash
Detailed description of the invention
After wet fly-ash (1) enters classification operation (2) classified sizing of equipment, the flyash of+0.045mm enters natural subsidence operation (6) after cement inclined-plane natural subsidence, precipitation water directly recycles as system water, and obtains the reject fly ash (11) that solid content is greater than 75%.The flyash of-0.045mm directly enters flotation circuit (3) after floatation equipment flotation: flotation essence charcoal enters that smart charcoal concentrates that press filtration operation (4) is concentrated through concentrator, after filtering equipment press filtration, filtrate water directly recycles as system water, and obtains the smart charcoal cake (5) that moisture is 23%; Flotation low powdered carbon coal ash directly enters that low charcoal concentrates that press filtration operation (7) is concentrated through concentrator, after filtering equipment press filtration, filtrate water directly recycles as system water, low powdered carbon coal ash enters dries sorting operation (8) after drying plant oven dry, the classification of screening installation fineness, obtains superfined flyash (9) and I level flyash (10) that moisture is less than 1%.
Claims (3)
1. a flyash comprehensive processing technological process, is characterized in that: comprise classification operation, flotation circuit, natural subsidence operation, smart charcoal concentrates press filtration operation, low charcoal concentrates press filtration operation, dry sorting operation; Wherein classification operation is that be divided into the flyash of+0.045mm and flyash two parts of-0.045mm, the flyash of+0.045mm enters the bevel deposition pond of natural subsidence operation by wet fly-ash by classifying equipoment classification; The flyash of-0.045mm directly enters the floatation equipment of flotation circuit; Described flotation circuit be the flyash of-0.045mm after floatation equipment flotation, flotation essence charcoal enters smart charcoal and concentrates in the smart charcoal concentrator of press filtration operation; Flotation low powdered carbon coal ash directly enters low charcoal and concentrates in the low charcoal concentrator of press filtration operation; It is that filtrate water directly recycles as system water, and obtains the smart charcoal cake that moisture is 23% from flowing to that smart charcoal in smart charcoal concentrator is concentrated through smart charcoal concentrator, after the press filtration of smart charcoal filtering equipment that essence charcoal concentrates press filtration operation; It is from flowing to that low powdered carbon coal ash paste in low charcoal concentrator is concentrated through too low charcoal concentrator, after the press filtration of low charcoal filtering equipment that low charcoal concentrates press filtration operation, filtrate water directly recycles as system water, and obtaining the low powdered carbon coal ash cake that moisture is 23%, low powdered carbon coal ash cake enters in the drying plant of oven dry sorting operation after fragmentation.
2. a kind of flyash comprehensive processing technological process according to claim 1, it is characterized in that: described oven dry sorting operation enters that low powdered carbon coal ash in drying plant is dried through drying plant, after the classification of screening installation fineness, obtains superfined flyash and I level flyash that moisture is less than 1%.
3. a kind of flyash comprehensive processing technological process according to claim 1, it is characterized in that: described natural subsidence operation enters the flyash of bevel deposition pond+0.045mm after cement inclined-plane natural subsidence, precipitation water directly recycles as system water, and obtains the reject fly ash that solid content is greater than 75%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210152211.8A CN102699013B (en) | 2012-05-09 | 2012-05-09 | Pulverized fuel ash comprehensive treatment technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210152211.8A CN102699013B (en) | 2012-05-09 | 2012-05-09 | Pulverized fuel ash comprehensive treatment technique |
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| CN102699013A CN102699013A (en) | 2012-10-03 |
| CN102699013B true CN102699013B (en) | 2015-01-21 |
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| CN201210152211.8A Expired - Fee Related CN102699013B (en) | 2012-05-09 | 2012-05-09 | Pulverized fuel ash comprehensive treatment technique |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695066B (en) * | 2013-12-18 | 2016-03-16 | 贵州赤天化集团有限责任公司 | Hard coal coal slurry gasifier discharges reuse method and the structure thereof of thin slag |
| CN107200494B (en) * | 2017-05-18 | 2019-08-20 | 新疆北新路桥集团股份有限公司 | A kind of coal ash, slag sorting processing method and super fine powder additives |
| CN109369049A (en) * | 2018-11-09 | 2019-02-22 | 中广核工程有限公司 | The removal methods of ammonium component are remained in flyash |
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|---|---|---|---|---|
| CN1245740A (en) * | 1999-06-28 | 2000-03-01 | 李宗华 | Refloatation method of fly-ash and refuse and its technological process |
| CN1864802A (en) * | 2006-04-25 | 2006-11-22 | 开滦精煤股份有限公司范各庄矿业分公司 | Process for dehydrating floatation coal |
| CN101185933A (en) * | 2006-11-16 | 2008-05-28 | 廖昌禧 | Coal ash resource treating method |
| CN101433880A (en) * | 2008-11-07 | 2009-05-20 | 倪志群 | Method for sorting coal ash |
| CN101797575A (en) * | 2010-03-09 | 2010-08-11 | 天津城市建设学院 | Flyash treatment method for waste incineration |
| CN102674720A (en) * | 2012-06-06 | 2012-09-19 | 湖南华天能环保科技开发有限公司 | Preparation technology for extracting carbon powder, iron core powder, primary pulverized fuel ash and secondary pulverized fuel ash from pulverized fuel ash |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2103361A1 (en) * | 2006-12-11 | 2009-09-23 | Mitsui Engineering and Shipbuilding Co, Ltd. | Method of removing unburned carbon from coal ash |
| CN101573183B (en) * | 2006-12-26 | 2013-05-29 | 三井造船株式会社 | Apparatus for removing unburned carbon in fly ash |
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2012
- 2012-05-09 CN CN201210152211.8A patent/CN102699013B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245740A (en) * | 1999-06-28 | 2000-03-01 | 李宗华 | Refloatation method of fly-ash and refuse and its technological process |
| CN1864802A (en) * | 2006-04-25 | 2006-11-22 | 开滦精煤股份有限公司范各庄矿业分公司 | Process for dehydrating floatation coal |
| CN101185933A (en) * | 2006-11-16 | 2008-05-28 | 廖昌禧 | Coal ash resource treating method |
| CN101433880A (en) * | 2008-11-07 | 2009-05-20 | 倪志群 | Method for sorting coal ash |
| CN101797575A (en) * | 2010-03-09 | 2010-08-11 | 天津城市建设学院 | Flyash treatment method for waste incineration |
| CN102674720A (en) * | 2012-06-06 | 2012-09-19 | 湖南华天能环保科技开发有限公司 | Preparation technology for extracting carbon powder, iron core powder, primary pulverized fuel ash and secondary pulverized fuel ash from pulverized fuel ash |
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