CN102261822B - Device for drying lignite by microwave fluidization - Google Patents
Device for drying lignite by microwave fluidization Download PDFInfo
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- CN102261822B CN102261822B CN 201110130503 CN201110130503A CN102261822B CN 102261822 B CN102261822 B CN 102261822B CN 201110130503 CN201110130503 CN 201110130503 CN 201110130503 A CN201110130503 A CN 201110130503A CN 102261822 B CN102261822 B CN 102261822B
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- microwave
- furnace shell
- heating chamber
- brown coal
- microwave heating
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- 238000001035 drying Methods 0.000 title claims abstract description 40
- 239000003077 lignite Substances 0.000 title claims abstract description 31
- 238000005243 fluidization Methods 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 239000000779 smoke Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 17
- 238000009423 ventilation Methods 0.000 claims description 14
- 230000004087 circulation Effects 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 16
- 239000003245 coal Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000010148 water-pollination Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The invention discloses a device for drying lignite by microwave fluidization. The device comprises a microwave heating chamber and a fluidized bed, wherein the fluidized bed is arranged at the bottom of the microwave heating chamber and communicated with the microwave heating chamber; the microwave heating chamber comprises a metal furnace shell capable of shielding microwaves, a material inlet and a smoke gas exhaust port are arranged at the top of the furnace shell, at least one microwave generation device is arranged on the side surface of the furnace shell, a cylindrical ceramic furnace tube through which microwaves can penetrate is further arranged in the furnace shell, a plurality of layers of annular metal baffle plates are arranged along the inner wall of the ceramic furnace tube from top to bottom, a rotating shaft is arranged at the center of the ceramic furnace tube, a plurality of rake-shaped structural members which correspond to the metal baffle plates respectively are fixedly arranged on the rotating shaft along the axial direction, and a tapered material guide disc is fixedly arranged on each rake-shaped structural member; and the fluidized bed is in vertical structure, an air chamber of the fluidized bed is connected with a hot air furnace through a first hot air inlet pipe and an overflow pipe connected with a finished product warehouse is arranged at the upper part of the fluidized bed. By adopting the device, the large-scale, fast, low-energy-consumption and deep-drying production of the lignite can be realized.
Description
Technical field
The invention belongs to the brown coal drying field, particularly a kind of device of microwave fluidized drying brown coal.
Background technology
International geologist's prediction: about 6,000,000,000,000 tons of whole world hard coal oil in place, about 4,000,000,000,000 tons of brown coal oil in place.China's brown coal reserves account for 16% of world's brown coal gross reserves, are main coal resources a kind of of China.
Brown coal are grizzles of the brownish black of a kind of degree of coalification between peat and pitch coal, and total moisture content generally can reach 20～50%, cracked, the easy oxidation and spontaneous combustion of easy-weathering, and quality is unstable.Generally adopt at present the predrying or steam drying process of flue gas that brown coal are carried out drying abroad, then directly deliver near coal-mine power plant and be used for combustion power generation, the near coal-mine power plant of China quantity is few, and most of power plant is away from the colliery, and transportation range is far away.If without drying, then be unfavorable for transportation, store, also be difficult to satisfy each user's quality requirement.
Wan Yongzhou etc. have introduced the drying brown coal technology such as the hot method of employing rotary pipe type, steam fluid bed, hot dewatering process/method the 91st～92 page of " coal engineering " the 8th phase in 2008; Patent CN10132626 discloses " microwave drying of coal ": behind coal grading, be loaded into the dry coal of water content within target water content that obtain in two-stage or the multistage microwave office by conveyer, the method exists the moisture that evaporates in the dry run to be difficult to take out of rapidly, and because the degree of depth of the moisture brown coal of microwave penetration is limited, can not increase the thickness in coal seam and realize large batch of drying, and difficult uniformity and the depth drying that guarantees drying, cause easily the coking quality of burning and reduction coal, the pore of coal is opened and does not carry out the effect that depth drying does not reach upgrading in the microwave drying process, makes on the contrary the easy suction of hydrophily enhancing of coal be unfavorable for storage.
More than known technical scheme have all that apparatus and process is complicated, drying efficiency is low, energy consumption is high, can not depth drying etc. such or such problem, cause the brown coal drying that is difficult to realize large-scale.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of device of microwave fluidized drying brown coal is provided, realize the drying production of the brown coal scale Kuai Su ﹑ Di Neng Hao ﹑ degree of depth.
The device of microwave fluidized drying brown coal provided by the invention, the fluid bed that comprises microwave heating chamber and be located at the microwave heating chamber bottom and be communicated with it; Microwave heating chamber comprises the metal furnace shell of maskable microwave, be provided with material inlet and exhaust smoke outlet at the furnace shell top, the furnace shell side is provided with at least 1 microwave generating apparatus, also be provided with the cylindrical ceramic boiler tube that can penetrate microwave in furnace shell inside, be provided with the circular metal baffles of some layers from top to bottom along the ceramics furnace inside pipe wall, be provided with a rotating shaft at the ceramics furnace tube hub, corresponding several rake shape structural members that in rotating shaft, is fixed with vertically with each metal baffles, and on each rake shape structural member, be fixed with conical material guiding plate; Described fluid bed bottom is provided with air compartment, and air compartment is connected with hot-blast stove by the first hot blast air inlet pipe, and fluid bed top is provided with the overflow pipe that is connected with finished bin.
Further technical scheme is:
Described metal furnace shell is some sections from top to bottom, and described metal baffles is located between adjacent two sections metal furnace shells, and described cylindrical ceramic boiler tube also is divided on some sections and the corresponding metal baffles that is installed in each section metal furnace shell inboard and on the ring flange;
Be provided with air distribution plate in the described air compartment;
This device also comprises the circulation of tail gas treatment system, and described circulation of tail gas treatment system links to each other with exhaust smoke outlet, hot-blast stove and finished bin;
Described circulation of tail gas treatment system comprises gas-solid separating device and the dewater unit that is attached thereto;
Described rotating shaft is the ventilation hollow shaft, correspondingly with each rake shape structural member on the outer wall of ventilation hollow shaft is provided with some gas nozzles, and the ventilation hollow shaft is connected with hot-blast stove by the second hot blast air inlet pipe.
Beneficial effect of the present invention: the first, in apparatus of the present invention, utilize the Microwave Heating brown coal, hot blast and material form countercurrent flow mutually, and baking temperature is low, and the utilization rate of energy is high; And hot blast carries steam and flows in cavity, has solved the problem that the microwave drying brown coal are prone to sparking and burn.The second, adopt metal baffles and rake shape structural member device to carry out cloth and stirring, so that temperature of charge and microwave field distribution are even on the same level face, drying effect is more even.The 3rd, rake shape structural member drives material step by step by deflection plate, is " S " type and flows from top to bottom, has solved the inadequate problem of microwave drying brown coal penetration depth, and has solved the problem of material easy putty in descending process.The 4th, brown coal directly enter fluid bed through microwave-hot air drying after to a certain degree and carry out fluidized drying, have solved the problem that traditional fluid bed can not depth drying under lower temperature.The 5th, the indoor air upflow of horizontal high velocity air disturbance microwave drying of gas nozzle ejection increases the gas-solid contact area, has accelerated dry carrying out.Six, during fluidized drying, the coal tar of the trace of separating out in the material has stopped up in the microwave section in the brown coal surface condensation and has carried out rapid draing and the pore that produces, makes material become hydrophobicity by hydrophily, reaches the effect of brown coal drying and upgrading.
The invention will be further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the transverse cross-sectional view of apparatus of the present invention.
The specific embodiment
See Fig. 1, Fig. 2, the device of microwave fluidized drying brown coal comprises microwave heating chamber 1, is connected with fluid bed by ring flange 3 connections in microwave heating chamber 1 bottom, and ring flange 3 is provided with the material hole 18 that is communicated with microwave heating chamber 1 and fluid bed 2; Microwave heating chamber 1 comprises the cylindrical metal furnace shell 4 of maskable microwave, be provided with material inlet 5 and exhaust smoke outlet 6 at furnace shell 4 tops, the edge is circumferentially with 4 microwave generating apparatus with in the microwave energy feed-in microwave heating chamber 1 on the furnace shell 4, microwave generating apparatus forms by being located at the microwave feed-in mouth 8 on the furnace shell 4 and the microwave source 9 that is installed on the microwave feed-in mouth 8, also be provided with the cylindrical ceramic boiler tube 10 that can penetrate microwave in furnace shell 4 inside, metal furnace shell 4 is 5 sections cylindrical structurals from top to bottom, adjacent two intersegmentally are provided with circular metal baffles 11, cylindrical ceramic boiler tube 10 also is divided on 5 sections and the corresponding deflection plate 11 that is installed in the furnace shell inboard and on the ring flange 3, snap ring 26 is used for fixing ceramic boiler tube, from top to bottom multiple layer metal deflection plate 11 is used for accepting material and delaying the material downstream rate along ceramic boiler tube 10 inboards, be provided with ventilation hollow shaft 12 at ceramic boiler tube 10 centers, with each metal baffles 11 corresponding several rake shape structural member 14 that on ventilation hollow shaft 12, are fixed with vertically, be positioned on the ventilation hollow shaft 12 on each rake shape structural member 14 and be fixed with a conical material guiding plate 20, correspondingly with each rake shape structural member on the outer wall of ventilation hollow shaft 12 be provided with some gas nozzles 13, air upflow in the horizontal high velocity air disturbance microwave heating chamber 1 of nozzle 13 ejection is to increase the gas-solid contact area of hot blast and material; The effect of material guiding plate 20 is that the material that will be fallen by upper strata metal baffles 11 is evenly distributed on the lower metal deflection plate 11, the effect of rake shape structural member 14 then be with the material on the metal baffles 11 to the middle part raking and fall, ventilation hollow shaft 12 is connected with hot-blast stove 15 by hot blast air inlet pipe 21; Fluid bed 2 bottoms are provided with air compartment 23, and air compartment 23 is connected with hot-blast stove 15 by hot blast air inlet pipe 22, is provided with air distribution plate 25 in the air compartment 23; Top is provided with the overflow pipe 16 that is connected with finished bin 17; Also comprise circulation of tail gas treatment system 7, circulation of tail gas treatment system 7 comprises conventional gas-solid separating device and the dewater unit that is attached thereto, the entrance of circulation of tail gas treatment system 7 is connected with exhaust smoke outlet 6, its gas vent is connected with hot-blast stove 15 by air blast 19 through gas-separating valve 25, and its solid outlet links to each other with finished bin 17 by feed back pipe 24.
The course of work of the present invention:
Moisture content is equal to or greater than more than 30%, the raw material brown coal (seeing solid arrow) that granularity is equal to or less than 10mm add from material inlet 5, the uniform rotation under the driving of motor of ventilation hollow shaft 12, drive simultaneously rake shape structural member 14 fixed thereon and material guiding plate 20 uniform rotation, material from top to bottom is evenly distributed on the metal baffles 11 that is located at ceramic boiler tube 10 inwalls through material guiding plate 20, being arranged in rake shape structural member 14 on each layer metal baffles 11 will fall into metal baffles 11 at rotation process material is harrowed by export-oriented center, fall into step by step and pass through material guiding plate 20 and metal baffles 11, make material be " S " type and flow from top to bottom, material heats predrying by microwave device in microwave heating chamber 1 to it; (200 ℃ ~ 220 ℃ of the hot blasts of hot-blast stove 15, oxygen content is below 10%, see dotted arrow) after air blast 19 pressurization, enter respectively the air compartment 23 of ventilation hollow shaft 12 and fluid bed 2 bottoms by hot blast air inlet pipe 21 and hot blast air inlet pipe 22, enter the fluosolids on top after the air distribution plate of hot blast in air compartment 23 evenly distributes in fluid bed 2; Hot blast enters microwave heating chamber 1 from material hole 18, flows from bottom to top, mutually forms adverse current with material, carries out heat exchange with the material of continuous adding, further the heat drying material; Up hot-air flow in the horizontal high speed hot-air flow disturbance microwave heating chamber 1 of gas nozzle 13 ejection, with the gas-solid contact area of increase with material, under microwave irradiation, moisture breaks away from fast in the material, the hot blast that is flowed is from bottom to top in time taken out of, the hot blast temperature at exhaust smoke outlet 6 places is higher than the steam dew point more than 5 ℃, and material is interior after microwave and hot blast Hybrid Heating drying in microwave heating chamber 1, and free water content is reduced to 5% and falls into fluid bed 2 with interior by material hole 18.
In fluid bed 2, hot blast drives material and is fluidized state, carries out depth drying, and the moisture in the material further breaks away from, and its free water content is reduced to 0.2% and overflows through overfall pipe 16 and enter finished bin 17 with the interior graininess that is.
The tail gas of discharging from exhaust smoke outlet 6 enters circulation of tail gas treatment system 7, and after conventional technology gas solid separation and dehydration, gas enters hot-blast stove 15, waste heat recovery through gas-separating valve 25 circulations; Enter finished bin 17 from circulation of tail gas treatment system 7 isolated solid materials through return duct 24.
Ventilation hollow shaft 12 in above-described embodiment also can be airproof rotating shaft, can realize essentially identical function equally in the situation of not wanting hot blast air inlet pipe 21.
Claims (6)
1. the device of microwave fluidized drying brown coal is characterized in that comprising microwave heating chamber and is located at bottom the microwave heating chamber and the fluid bed that is communicated with it; Microwave heating chamber comprises the metal furnace shell of maskable microwave, be provided with material inlet and exhaust smoke outlet at the furnace shell top, the furnace shell side is provided with at least 1 microwave generating apparatus, also be provided with the cylindrical ceramic boiler tube that can penetrate microwave in furnace shell inside, be provided with the circular metal baffles of some layers from top to bottom along the ceramics furnace inside pipe wall, be provided with a rotating shaft at the ceramics furnace tube hub, corresponding several rake shape structural members that in rotating shaft, is fixed with vertically with each metal baffles, and on each rake shape structural member, be fixed with conical material guiding plate; Described fluid bed bottom is provided with air compartment, and air compartment is connected with hot-blast stove by the first hot blast air inlet pipe, and fluid bed top is provided with the overflow pipe that is connected with finished bin.
2. the device of microwave fluidized drying brown coal according to claim 1, it is characterized in that described microwave heating chamber bottom is connected ring flange with fluid bed and connects, the metal furnace shell is some sections from top to bottom, described metal baffles is located between adjacent two sections metal furnace shells, and described cylindrical ceramic boiler tube also is divided on some sections and the corresponding metal baffles that is installed in each section metal furnace shell inboard and on the ring flange.
3. the device of microwave fluidized drying brown coal according to claim 1 is characterized in that being provided with air distribution plate in the described air compartment.
4. the device of microwave fluidized drying brown coal according to claim 1 is characterized in that also comprising the circulation of tail gas treatment system, and described circulation of tail gas treatment system links to each other with exhaust smoke outlet, hot-blast stove and finished bin.
5. the device of microwave fluidized drying brown coal according to claim 4 is characterized in that described circulation of tail gas treatment system comprises gas-solid separating device and the dewater unit that is attached thereto.
6. according to claim 1 to the device of the described microwave fluidized drying of 5 described arbitrary claims brown coal, it is characterized in that described rotating shaft is the ventilation hollow shaft, correspondingly with each rake shape structural member on the outer wall of ventilation hollow shaft be provided with some gas nozzles, the ventilation hollow shaft is connected with hot-blast stove by the second hot blast air inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110130503 CN102261822B (en) | 2011-05-19 | 2011-05-19 | Device for drying lignite by microwave fluidization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110130503 CN102261822B (en) | 2011-05-19 | 2011-05-19 | Device for drying lignite by microwave fluidization |
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| CN102261822A CN102261822A (en) | 2011-11-30 |
| CN102261822B true CN102261822B (en) | 2013-05-01 |
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| CN 201110130503 Expired - Fee Related CN102261822B (en) | 2011-05-19 | 2011-05-19 | Device for drying lignite by microwave fluidization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU205517U1 (en) * | 2020-12-10 | 2021-07-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный архитектурно-строительный университет" (ННГАСУ) | Combined heating chamber |
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| CN103115478B (en) * | 2013-02-17 | 2015-04-29 | 中国神华能源股份有限公司 | Drying equipment |
| CN103438687A (en) * | 2013-08-09 | 2013-12-11 | 黄石市建材节能设备总厂 | Explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system |
| CN104006631B (en) * | 2014-06-13 | 2015-09-16 | 济宁学院 | A kind of Multistage Microwave fluidized bed drying device and drying means thereof |
| CN104034127B (en) * | 2014-06-19 | 2015-11-18 | 中国烟草总公司郑州烟草研究院 | Microwave fluid bed hot blast combined drying experimental provision |
| CN104388143A (en) * | 2014-11-14 | 2015-03-04 | 中国矿业大学(北京) | Two-stage continuous lignite upgrading system |
| CN105300034A (en) * | 2015-12-07 | 2016-02-03 | 东北大学 | Vibration fluidization microwave multi-element drying device used for low-rank coal upgrading |
| CN107062825B (en) * | 2017-05-05 | 2019-03-19 | 湖南文理学院 | A kind of drying unit of food processing |
| CN113758158B (en) * | 2021-09-24 | 2022-05-17 | 四川大学 | Microwave vacuum freeze-drying device |
| CN114377633B (en) * | 2021-12-27 | 2022-11-01 | 西北大学 | Microwave-driven lignite or biomass heating selective dehydration and deoxidation device and method |
| CN114717369B (en) * | 2022-03-16 | 2023-03-10 | 太原理工大学 | Microwave quality-improving coal injection treatment device and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0571871A (en) * | 1991-09-10 | 1993-03-23 | Micro Denshi Kk | Floating, heating and drying method with microwave |
| DE10260745A1 (en) * | 2002-12-23 | 2004-07-01 | Outokumpu Oyj | Process and plant for the thermal treatment of granular solids |
| JP2004216694A (en) * | 2003-01-14 | 2004-08-05 | Itsuwa Kogyo Kk | Apparatus for drying and crystallizing treatment of ground matter of used pet bottle |
| ITTV20050041A1 (en) * | 2005-03-15 | 2006-09-16 | S M C Srl | EQUIPMENT FOR THE RAPID AND CONTINUOUS DEHUMIDIFICATION OF MATERIALS THAT ARE PARTICULARLY MIXED OF PELLETS FOR PLASTIC MATERIAL MOLDING. |
| CN201434562Y (en) * | 2009-08-28 | 2010-03-31 | 中山大学 | Microwave fluidized-bed equipment used for drying powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU205517U1 (en) * | 2020-12-10 | 2021-07-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный архитектурно-строительный университет" (ННГАСУ) | Combined heating chamber |
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| CN102261822A (en) | 2011-11-30 |
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