CN102266816A - Thermal coal low-cost ash reduction and byproduct mineral comprehensive utilization process - Google Patents
Thermal coal low-cost ash reduction and byproduct mineral comprehensive utilization process Download PDFInfo
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- CN102266816A CN102266816A CN2010101304788A CN201010130478A CN102266816A CN 102266816 A CN102266816 A CN 102266816A CN 2010101304788 A CN2010101304788 A CN 2010101304788A CN 201010130478 A CN201010130478 A CN 201010130478A CN 102266816 A CN102266816 A CN 102266816A
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Abstract
The invention discloses a thermal coal low-cost ash reduction and byproduct mineral comprehensive utilization process and belongs to the technical field of a physical separation process. In order to solve the technical problem, a method with a simple process and low cost is provided to reduce charged ash content of thermal coal; and a technical scheme is that: under the conditions of specific coal raw materials containing magnetic minerals, ash is reduced by a magnetic concentration technology by utilizing favorable conditions that minerals are crushed to reach the same fineness and are dried in the process of pulverizing the coal in a power plant, process flows and process technical conditions of ash reduction and combining parts, modes of coal pulverizing process flow in the power plant and conditions for guaranteeing the safe operation of the process are set, and a method, process flows and technical conditions for ash reduction byproduct mineral comprehensive utilization are designed. The charged ash content of the thermal coal is reduced and ash reduction byproducts are comprehensively utilized, energy can be saved, the capacity of a generating boiler can be relatively improved, valuable mineral resources are obtained simultaneously, and obvious economic benefit is produced.
Description
Technical field: physical separation technology.
Background technology: well-known, non-flammable mineral promptly become pit ash in coal, and these ash contents normally take off with the method for washing (gravity treatment or flotation) in the coal washery and fall.To electric coal, the washing degree is crossed and is not only made the gangue that contains a large amount of combustibles be difficult to utilize deeply, and has increased the feed coal cost greatly, this is unacceptable, therefore, electric coal is just put very widely to ash content on national standard, still has very high ash content to exist in the electric coal.The existence of ash content can reduce the stationarity of burning velocity and burning, increases idle work and reduction boiler production capacity that boiler is done, and it is disadvantageous that power plant is produced, and therefore, under possible situation, should further reduce electric pit ash.
Summary of the invention:
Core of the present invention is, is containing under the particular coal material condition of magnetic mineral, utilizes power plant also that the mineral powder is pure in same fineness and dry advantage simultaneously in the process of coal powder process, adopts the magnetic concentration technology to fall ash.The present invention has set technological process and the technology condition that falls ash, and with the condition of the binding site of power plant's coal flouring technology flow process, mode and the operation of guarantee process safety, also designed the technological process and the technical conditions of falling grey byproduct mineral matter comprehensive utilization simultaneously.Meaning of the present invention is, that uses that technological process method simple and with low cost reduces electric coal goes into the ashes branch, can realize energy-conservation (reduce mineral and be heated idle work) and relative raising electricity generation boiler production capacity (with taking out mineral percentage accounting), obtain valuable mineral resources simultaneously, can obtain very remarkable economic efficiency.With similar method of the present invention and present domestic not the appearing in the newspapers as yet or application of technology.
1. the present invention is applicable to specific coal raw material, requires in the coal raw material relative magnetic susceptibility greater than 15 * 10
-6Centimetre
3The magnetic mineral content of/gram reaches more than 0.5%.This is a Technological Economy meaning of the present invention.
2. the present invention must combine with power plant coal pulverizing process, can realize after coal powder process is arrived certain fineness, is dried to certain humidity.
3. technological process: see accompanying drawing one, accompanying drawing two.Ash falls in A electricity coal---and behind the powder process drier, take out coal dust, send into one-level dry high-magnetic separation machine (magnetic field intensity H=880～1600 kilo-ampere/rice) with screw feeder and sort, remove magnetic mineral in the coal dust with the reduction ash content;
Selecting mineral sends into the magnetic separation of secondary intensity magnetic separator and removes the coal dust that mineral are carried secretly; The mineral that secondary magnetic separation goes out are gone into the cyclone separator selection by winnowing with the cooling stack air-blowing again and are taken off coal (can contain the choosing of coal amount according to mineral establishes); Coal dust merges delivers to Pulverized Coal Bin.The one-level magnetic separation all seals except that going out mine mouth and coal outlet, is blown into magnetic separator inside with a small amount of cool flue gas and carries out the protection of gas hypoxic atmosphere.B byproduct mineral matter comprehensive utilization---iron, manganese mineral content and composition in the assay mineral; 1. if magnetic iron ore content greater than 5%, carries out a dry separation with the moderate strength magnetic separator, the crude iron concentrate of selecting advances wet ball-milling, screening, obtains iron ore concentrate through two sections wet type low intensity magnetic separation machine choosings again; The dry separation mine tailing is roughly selected once with dry type permanent magnetism roll-type high-intensity magnetic field high gradient magnetic separator, connects two sections high gradient wet separations again and obtains iron ore concentrate.2. if, then directly pressing the same method flow of dry separation mine tailing less than 5%, handles magnetic iron ore content.3. but manganese content reaches the economic utilization grade and adopts then that the high-intensity magnetic field high-gradient magnetic separation---floatation process is sorted utilization.
4. technology condition:
1. fineness of pulverized coal R90＜40%;
2. coal dust moisture content≤5%;
3. cooling stack gas≤45 ℃;
4. coal dust temperature in the one-level magnetic separator＜66 ℃;
5. gas oxygen plot ratio in the one-level magnetic separator＜16%;
6. mineral grind the amount of fineness-74um greater than 60%
Description of drawings:
Fig. 1 falls grey flow process for electric coal, 1 powder process drier among the figure; 2 Pulverized Coal Bin; 3 feeding screws; 4 one-level magnetic separators; 5 secondary magnetic separation machines; 6 coolers: 7 blower fans; 8 blenders; 9,10 cyclone separators; 11 dry powder pumps.Powder process drier and Pulverized Coal Bin are the existing equipment facilities of power plant's flouring technology, and other is the newly added equipment facility.
Fig. 2 is byproduct mineral matter comprehensive utilization flow process.
The specific embodiment:
1, need reach an agreement with power plant or become the concerted activities people of this project implementation with power plant.
2, determine the possibility of enforcement according to the physical condition in power plant's flour mill flow and production place.
3, the coal steady in a long-term source of the power plant that needs are implemented and the coal sampling under the different operational version that is mixed are fallen the ash test according to the technology condition magnetic that requires to run business into strong one after the powder process, measure and fall grey percentage.
4, whether the coal dust behind the checking power plant powder process drier can reach the desired fineness of technology of the present invention, humidity technical conditions.
5, ash magnetic iron ore and other iron mineral content, manganese mineral content and the coal combustible content in the mineral of producing falls in analysis.
6, fall grey flow process and reach more than 0.5% and can fall grey flow implementation falling grey percentage, fall grey percentage, do to select to implement after the technical economic analysis 0.5% when following according to of the present invention; Mineral extract the comprehensive utilization flow process and carry out the technological process selection according to falling grey percentage and mineral composition; The inventor provides technological service to technological process selection and lectotype selection.
7, exploiting entity's tissue carries out Preliminary design, construction drawing design, and organization funds implements technological transformation.
Claims (5)
1. after electric coal powder process drying, adopt the magnetic concentration technology to fall the method for ash.
2. the technological process and the technical conditions of ash fall in electric coal magnetic concentration: technological process---behind the powder process drier, take out coal dust, send into one-level dry high-magnetic separation machine (magnetic field intensity H=880～1600 kilo-ampere/rice) with screw feeder and sort, remove magnetic mineral in the coal dust to reduce ash content; Selecting mineral sends into the magnetic separation of secondary intensity magnetic separator and removes the coal dust that mineral are carried secretly; The mineral that secondary magnetic separation goes out are gone into the cyclone separator selection by winnowing with the cooling stack air-blowing again and are taken off coal (can contain the choosing of coal amount according to mineral establishes); Coal dust merges delivers to Pulverized Coal Bin.Technical conditions---1. fineness of pulverized coal R90＜40%; 2. coal dust moisture content≤5%.
3. carry out the method and the technical conditions of safeguard protection with cool flue gas: the one-level magnetic separation all seals except that going out mine mouth and coal outlet, is blown into magnetic separator inside with a small amount of cool flue gas and carries out the protection of gas hypoxic atmosphere; Cooling stack gas≤45 ℃; Coal dust temperature in the one-level magnetic separator＜66 ℃; Gas oxygen plot ratio in the one-level magnetic separator＜16%;
4. the byproduct mineral matter that ash falls in electric coal magnetic concentration adopts magnetic separation technology to carry out comprehensive utilization method.
5. the technological process of the byproduct mineral matter comprehensive utilization of ash falls in electric coal magnetic concentration: the iron in the assay mineral, manganese mineral content and composition; 1. if magnetic iron ore content greater than 5%, carries out a dry separation with the moderate strength magnetic separator, the crude iron concentrate of selecting advances wet ball-milling, screening, obtains iron ore concentrate through two sections wet type low intensity magnetic separation machine choosings again; The dry separation mine tailing is roughly selected once with dry type permanent magnetism roll-type high-intensity magnetic field high gradient magnetic separator, connects two sections high gradient wet separations again and obtains iron ore concentrate.2. if, then directly pressing the same method flow of dry separation mine tailing less than 5%, handles magnetic iron ore content.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101304788A CN102266816A (en) | 2010-03-04 | 2010-03-04 | Thermal coal low-cost ash reduction and byproduct mineral comprehensive utilization process |
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| CN2010101304788A CN102266816A (en) | 2010-03-04 | 2010-03-04 | Thermal coal low-cost ash reduction and byproduct mineral comprehensive utilization process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103041921A (en) * | 2012-12-20 | 2013-04-17 | 山东科力华电磁设备有限公司 | Method for extracting iron ore concentrate under anhydrous condition |
Citations (5)
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| CN1418734A (en) * | 2002-12-26 | 2003-05-21 | 天地科技股份有限公司唐山分公司 | Heavy medium vortrap, coal separation system and method therefor |
| CN101455992A (en) * | 2008-12-10 | 2009-06-17 | 重庆南桐矿业有限责任公司南桐选煤厂 | Power coal and sulfur concentrate sorting method and special device thereof |
| CN101502819A (en) * | 2009-03-25 | 2009-08-12 | 中钢集团马鞍山矿山研究院有限公司 | Pre-selection method of low-ore grade magnetic iron ore |
| CN101531938A (en) * | 2008-03-11 | 2009-09-16 | 河南理工大学 | Two-section dry-type magnetic separation purification process before combustion of pulverized coal |
| CN101559403A (en) * | 2009-05-31 | 2009-10-21 | 安徽大昌矿业集团有限公司 | Method for concentrating extremely low-grade refractory magnetite |
-
2010
- 2010-03-04 CN CN2010101304788A patent/CN102266816A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1418734A (en) * | 2002-12-26 | 2003-05-21 | 天地科技股份有限公司唐山分公司 | Heavy medium vortrap, coal separation system and method therefor |
| CN101531938A (en) * | 2008-03-11 | 2009-09-16 | 河南理工大学 | Two-section dry-type magnetic separation purification process before combustion of pulverized coal |
| CN101455992A (en) * | 2008-12-10 | 2009-06-17 | 重庆南桐矿业有限责任公司南桐选煤厂 | Power coal and sulfur concentrate sorting method and special device thereof |
| CN101502819A (en) * | 2009-03-25 | 2009-08-12 | 中钢集团马鞍山矿山研究院有限公司 | Pre-selection method of low-ore grade magnetic iron ore |
| CN101559403A (en) * | 2009-05-31 | 2009-10-21 | 安徽大昌矿业集团有限公司 | Method for concentrating extremely low-grade refractory magnetite |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103041921A (en) * | 2012-12-20 | 2013-04-17 | 山东科力华电磁设备有限公司 | Method for extracting iron ore concentrate under anhydrous condition |
| CN103041921B (en) * | 2012-12-20 | 2015-06-24 | 山东科力华电磁设备有限公司 | Method for extracting iron ore concentrate under anhydrous condition |
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Application publication date: 20111207 |