CN101445739B - Method for drying lignite through horizontal moving bed - Google Patents
Method for drying lignite through horizontal moving bed Download PDFInfo
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- CN101445739B CN101445739B CN200810240897XA CN200810240897A CN101445739B CN 101445739 B CN101445739 B CN 101445739B CN 200810240897X A CN200810240897X A CN 200810240897XA CN 200810240897 A CN200810240897 A CN 200810240897A CN 101445739 B CN101445739 B CN 101445739B
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- brown coal
- moving bed
- hot gas
- horizontal moving
- lignite
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- 239000003077 lignite Substances 0.000 title claims abstract description 73
- 238000001035 drying Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 56
- 239000007789 gas Substances 0.000 claims description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 12
- 239000003245 coal Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000012170 montan wax Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A method for drying lignite through a horizontal moving bed is characterized in that a feeding device is utilized for uniformly distributing the lignite materials on the horizontal moving bed with the thickness thereof being 500mm to 1000mm; the moving bed comprises a plurality of material-carrying boards; the material-carrying boards can distribute wind, conduct the reciprocating movement when being driven by a hydraulic driving device, and enable the materials to tumble when conveying the materials; the material-conveying direction is perpendicular to the speed direction of a primary hot gas; an agitating device is arranged in the lignite materials so as to enable the contact between the lignite and the high-temperature gas to accelerate; a secondary hot gas supplying device is arranged in the lignite materials for supplying high-temperature gas to the middle-upper part of the lignite materials, so that the heat transfer enhancement is achieved. With the adoption of the method, the lignite with large range of particle size can be directly dried, and the stability and the upsizing of drying devices are facilitated.
Description
Technical field
The present invention relates to a kind of brown coal drying technology, particularly a kind of horizontal moving bed formula brown coal drying technology belongs to coal chemical technology.
Background technology
Brown coal are the diagenetic products of peat, i.e. the rock that under physics, biology, chemical action, becomes of plant remains.Brown coal are less coals of degree of coalification in the coal resources, belong to soft coal.Compare with other coal, the brown coal oxygen content is high, and ash content is big, and density is little, is easy to spontaneous combustion, and coal dust explodes easily.According to prediction, global brown coal oil in place is about 4,000,000,000,000 tons, account for coal reserves 40% a little less than.The brown coal reserves account for about 13% of the total proved reserves of coal in China; Be main coal resources a kind of of China; Be mainly used in burning, pyrolysis, coking, gasification, extraction montan wax and brown coal microbial transformation and utilization, play important effect in coal at China's power and chemical industry.The brown coal of China are the inferior fuels of a kind of high volatile (about 50%), high-moisture (about 30%), high ash content (about 30%), low heat value (about 14MJ/kg), low ash smelting point.Mainly be distributed in ground such as northeast, northwest, southwest and North China, concentrate on provinces such as the Inner Mongol, Yunnan and Heilungkiang.Because economic development is slower, these regional coal consumptions are compared less with the developed area.Therefore, need brown coal be transported to apart from the distant place that utilizes.Because the existence of high-moisture in the brown coal has caused the transport power waste of the railway system.The brown coal drying technology is exactly the process that it is dry on the spot, can obtain the steam coal of golf calorific value.This process had both reduced the waste that the railway system is caused for transportation high-moisture brown coal, had important and practical meanings for the efficient cascade utilization of brown coal.
The brown coal drying mode mainly contains fluid bed, rotary kiln etc., and drying medium mainly contains flue gas, water vapour etc.See that from drying principles fluid bed drying process exists maximization and fluidised form control problem, and its treating capacity of rotary kiln drying technology receives the heated air quantitative limitation, is difficult to maximize use.See from drying medium; Because brown coal are a kind of coals of very easily separating out volatile matter; When adopting the oxygen-containing gas dry run, if the problems of excessive heat that the selective oxidation heat release is caused causes volatile combustion easily; Thereby cause the combustion problem of drying system, influence the normal and stable operation of system.Existing brown coal drying technology many places are in the scale demonstration phase, and the stable operation problem is the one of the main reasons that these process scale of puzzlement are used.See from brown coal drying The Application of Technology situation, still lack all perfect technology in aspects such as practical applications and economy and technology at present.Therefore, see from present brown coal drying technological development situation, can maximize, execute-in-place efficient brown coal drying technology simple, stable performance is the main direction of research and development always.
Summary of the invention
The operation stability that in practical applications, exists to existing brown coal drying technology relatively poor with the problem that is difficult to maximize, the present invention proposes a kind of horizontal moving bed brown coal drying method that adopts.
The objective of the invention is to realize through following technical scheme:
A kind of horizontal moving bed formula brown coal drying method is characterized in that this method comprises the steps:
A. with need carry out dry brown coal material by charging gear be evenly arranged in horizontal moving bed on, the thickness of the bed of material is in 500mm～1000mm scope; Described moving bed is made up of polylith material containing plate, all has hot gas cloth air port on every block of material containing plate one time, and the material containing plate is reciprocating under the driving of drive unit, move back and forth to realize rolling and carry material through this; The brown coal residence time of material is adjusted in 20～50min scope, and in moving bed top and brown coal material the cloth agitating device, quicken rolling to material;
B. a hot gas blasts air compartment by air blast, and through contacting with brown coal behind the cloth air port on the material containing plate, it is vertical that speed of hot gasses direction and material transport direction; A described hot gas is that oxygen content is lower than 10%, temperature is at 120～240 ℃ hot gas;
C. hot gas temperature drops to being higher than between 5～15 ℃ of the dew-point temperatures of dry gas outlet from 120～240 ℃ of inlet, accomplishes dry run.
D. the brown coal from the horizontal moving bed air compartment that bleeds are regularly regained by retracting device.
For the middle and upper part of giving the brown coal bed of material provides more high-temperature gas; Strengthen gas-particle heat transfer, mass transfer; The present invention can arrange secondary hot gas device for supplying on moving bed top, and described secondary hot gas is that oxygen content is lower than 10%, temperature is at 120～240 ℃ hot gas.
The present invention compared with prior art, have the following advantages and the high-lighting effect: the present invention has adaptability widely to brown coal material shapes, size; Because moving bed is made up of polylith material containing plate, can increase the size of moving bed simultaneously, therefore in engineering reality, maximize easily, good operation stability, convenient maintenance through increasing material containing plate quantity.
Description of drawings
Fig. 1 is a horizontal moving bed formula brown coal drying method sketch map of the present invention.
Among the figure: 1-brown coal inlet; 2-brown coal material; 3-adds agitating device; The outlet of 4-dry gas; 5-hot gas secondary device for supplying; 6-apparatus main body shell; The outlet of 7-brown coal; 8-material containing plate; 9-hot gas inlet; 10-hot gas mixing chamber; 11-is horizontal moving bed.
The specific embodiment
Below in conjunction with accompanying drawing technological process of the present invention and operation principle are further described
The present invention mainly comprises: brown coal inlet 1, brown coal outlet 7, material containing plate 8, horizontal moving bed 11; Hot gas inlet 9, dry gas outlet 4 adds agitating device 3; Be arranged on the hot gas mixing chamber 10 of material containing plate bottom, hot gas secondary device for supplying 5, apparatus main body shell 6.
Technological process of the present invention and operation principle are:
Brown coal material 2 is evenly arranged on horizontal moving bed 11 through charging gear by brown coal inlet 1 after preliminary precrushing, and horizontal moving bed 11 are made up of polylith material containing plate 8, have hot gas cloth air port on the material containing plate 8 one time.The thickness of brown coal material 2 remains in 500mm～1000mm scope, and the thick bed of material can make brown coal the too small situation of local resistance in dry run, can not occur.One time hot gas blasts hot gas mixing chamber 10 by air blast; Force to provide hot gas through the cloth air port on the material containing plate 8 to the brown coal material; Hot gas and brown coal material be at the inner two turbulent flow swap statuses mutually that form of drying device, mixes, the physical process of heat transfer, mass transfer.The material containing plate is reciprocating under the drive of fluid pressure drive device; Through this motion realization transporting forward to the brown coal material; It is vertical with a speed of hot gasses direction that material transports direction; The reciprocating motion of material containing plate can also be played the effect of rolling to material, and this effect of rolling helps heat transfer, the mass transport process of gas and brown coal particle, quickens the drying of brown coal.Arrange brown coal agitating device 3 in moving bed 11 tops, the brown coal material; Acceleration brown coal material contacts with high-temperature gas; Can also arrange secondary hot gas device for supplying 5 in moving bed top, the brown coal material simultaneously; For the middle and upper part of the bed of material provides more high-temperature gas, strengthen gas-particle heat transfer, realize rapid draing.Hot gas and secondary hot gas all adopt oxygen concentration to be lower than 10%, the hot gas of temperature in 120～240 ℃.Gas temperature drops to being higher than between 5～15 ℃ of the gas dew point temperature of dry gas outlet 4 rapidly from about 120～240 ℃ of hot gas inlet 9 in the dry run, accomplishes dry run.Moving bed 11 effective heat transfer length, width can design according to treating capacity, need to guarantee that material gets final product required drying time.Because moving bed 11 is made up of polylith material containing plate 8,, this method realizes easily maximizing so having guaranteed drying device.
Because brown coal are a kind of coals of very easily separating out volatile matter; When adopting higher gas of oxygen content or air dry; If the problems of excessive heat that the selective oxidation heat release is caused is easy to cause volatile combustion, thereby cause the combustion problem of drying system; Influence the normal and stable operation of system, so the medium of dry brown coal is an oxygen content is lower than 10%, temperature is lower than 240 ℃ hot gas.Oxygen content is lower in the gas, can either prevent that like this brown coal from spontaneous combustion taking place in dry run, also can effectively utilize various used heat resources.For further raising system operation stability, arrange anti-flaming, explosion-protection equipment simultaneously in the drying system domestic demand.
Brown coal material 2 is discharged by brown coal outlet 7 after after horizontal moving bed 11 transporting, being dry state basically by bone dry.The gas of accomplishing the brown coal drying process carries part brown coal fine particle and gets into outside deduster through dry gas outlet 4, and the most particles that carry in the gas are separated.These separated particles that get off are sent into coal store storage back and are walked by transhipment regularly.Send into chimney from the gas up to standard that outside deduster comes out through air-introduced machine, enter atmosphere.Few particulate coal dust bleeds from horizontal moving bed 11 and is collected into aggregate bin the air compartment, when the brown coal in the hopper reach a certain height, can regularly regained fine granular brown and it is transported away by retracting device.
Claims (2)
1. a horizontal moving bed formula brown coal drying method is characterized in that this method comprises the steps:
A. with need carry out dry brown coal material by charging gear be evenly arranged in horizontal moving bed on, the thickness of the bed of material is in 500mm～1000mm scope; Described moving bed is made up of polylith material containing plate, all has hot gas cloth air port on every block of material containing plate one time, and the material containing plate is reciprocating under the driving of drive unit, move back and forth to realize rolling and carry material through this; The brown coal residence time of material is adjusted in 20～50min scope, and in moving bed top and brown coal material the cloth agitating device, quicken rolling to material;
B. a hot gas blasts air compartment by air blast, and through contacting with brown coal behind the cloth air port on the material containing plate, it is vertical that speed of hot gasses direction and material transport direction; A described hot gas is that oxygen content is lower than 10%, temperature is at 120～240 ℃ hot gas;
C. hot gas temperature drops to being higher than between 5～15 ℃ of the dew-point temperatures of dry gas outlet from 120～240 ℃ of inlet, accomplishes dry run;
D. the brown coal from the horizontal moving bed air compartment that bleeds are regularly regained by retracting device.
2. according to the described horizontal moving bed formula brown coal drying method of claim 1, it is characterized in that: arrange secondary hot gas device for supplying on moving bed top, described secondary hot gas is that oxygen content is lower than 10%, temperature is at 120～240 ℃ hot gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810240897XA CN101445739B (en) | 2008-12-26 | 2008-12-26 | Method for drying lignite through horizontal moving bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810240897XA CN101445739B (en) | 2008-12-26 | 2008-12-26 | Method for drying lignite through horizontal moving bed |
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| Publication Number | Publication Date |
|---|---|
| CN101445739A CN101445739A (en) | 2009-06-03 |
| CN101445739B true CN101445739B (en) | 2012-07-25 |
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| CN200810240897XA Expired - Fee Related CN101445739B (en) | 2008-12-26 | 2008-12-26 | Method for drying lignite through horizontal moving bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845312B (en) * | 2010-05-13 | 2013-04-17 | 河北理工大学 | Lignite drying and carbonization quality-improving tower with reciprocating and turning-back rolling bed |
| CN102102021B (en) * | 2010-12-02 | 2013-04-17 | 吴植仁 | Lignite upgrading furnace |
| CN108043502B (en) * | 2017-12-12 | 2019-10-18 | 新昌县城关升华机械厂 | The medical reciprocating thorough mashing device of Chinese medicine in one kind |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4249317A (en) * | 1979-11-05 | 1981-02-10 | Murdock James D | Solar drying apparatus and process for drying materials therewith |
| CN85100817A (en) * | 1985-04-01 | 1987-01-10 | 沃斯特—阿尔卑斯股份公司 | The package unit that is used for the drying of high-moisture brown coal |
| CN1059751A (en) * | 1991-05-21 | 1992-03-25 | 西安矿业学院 | Xylite charcoal and preparation technology thereof |
| EP0819902A1 (en) * | 1996-07-17 | 1998-01-21 | GEA Wärme- und Umwelttechnik GmbH | Plant for steam fluidized bed drying |
| WO2003018716A1 (en) * | 2001-08-29 | 2003-03-06 | Generation Technology Research Pty Ltd | Coal dewatering system and method |
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
| CN101294765A (en) * | 2008-06-05 | 2008-10-29 | 神华集团有限责任公司 | Low rank coal high temperature flue gas drying method and device |
-
2008
- 2008-12-26 CN CN200810240897XA patent/CN101445739B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4249317A (en) * | 1979-11-05 | 1981-02-10 | Murdock James D | Solar drying apparatus and process for drying materials therewith |
| CN85100817A (en) * | 1985-04-01 | 1987-01-10 | 沃斯特—阿尔卑斯股份公司 | The package unit that is used for the drying of high-moisture brown coal |
| CN1059751A (en) * | 1991-05-21 | 1992-03-25 | 西安矿业学院 | Xylite charcoal and preparation technology thereof |
| EP0819902A1 (en) * | 1996-07-17 | 1998-01-21 | GEA Wärme- und Umwelttechnik GmbH | Plant for steam fluidized bed drying |
| WO2003018716A1 (en) * | 2001-08-29 | 2003-03-06 | Generation Technology Research Pty Ltd | Coal dewatering system and method |
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
| CN101294765A (en) * | 2008-06-05 | 2008-10-29 | 神华集团有限责任公司 | Low rank coal high temperature flue gas drying method and device |
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| CN101445739A (en) | 2009-06-03 |
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Granted publication date: 20120725 |