CN102748923B - Method for drying coal slime - Google Patents
Method for drying coal slime Download PDFInfo
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- CN102748923B CN102748923B CN201210221818.7A CN201210221818A CN102748923B CN 102748923 B CN102748923 B CN 102748923B CN 201210221818 A CN201210221818 A CN 201210221818A CN 102748923 B CN102748923 B CN 102748923B
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Abstract
The invention discloses a method for drying coal slime, aiming at low energy consumption, small environmental pollution and high rate of drying. The method for drying coal slime is characterized in that: coal dust is subjected to filter press dewatering by using a plate basket filter press to form coal slime filter cake with the water ratio of 30%, the coal slime filter cake is conveyed by a belt conveyer into powder material microwave drying equipment for drying until the water ratio of the coal slime filter cake is 20%, and then the coal slime filter cake is conveyed by a belt conveyer into a hollow blade drier for further drying; steam generated in the dried coal slime filter cake is introduced into a boiler steam recycling machine by an induced fan and a pipeline equipped on the microwave drying equipment; the steam is pressurized by the boiler steam recycling machine and then conveyed into a steam drum of a steam boiler; the steam is mixed with the original steam in the steam boiler, and the mixed steam is further heated by the steam boiler and conveyed into the blade drier; and the coal slime filter cake with the water ratio of 20% is further dried by the blade drier until the water ratio is 13%.
Description
Technical field
The present invention relates to a kind of method of utilizing combination drying equipment to dry coal slime.
Background technology
Coal slime is the semi-solid thing of the moisture formation of coal dust, is that the one in coal production and process is paid product.In coal washing process, coal slime forms slime filter cake through the press filtration of plate basket filter press, and the effect of coal slime processing directly affects the economic benefit of coal separation enterprise.At present, the dry method that conventionally adopts multiple drying equipment combination drying of coal slime, to improve the speed of oven dry.Its weak point is that each drying equipment is all to adopt respectively the energy separately to drive, and energy resource consumption is large, and environmental pollution is more serious.
Summary of the invention
The present invention seeks to overcome the deficiency of above-mentioned prior art, the coal slime that a kind of energy resource consumption is low, environmental pollution is little, drying rate is fast furnace drying method is provided.
The inventive method is:
(1) slime filter cake of moisture content 30% will be formed with plate basket filter press after coal dust filter-press dehydration, slime filter cake is transported in powder body material microwave dryer and is dried by belt feeder, drying is 20% to coal slime moisture content, is more automatically exported and delivered to hollow blade drier and further dry by belt feeder;
(2) air-introduced machine and pipeline that the steam that powder body material microwave dryer produces in dry coal slime process is equipped with by microwave dryer are introduced boiler vapor recovery machine; Be forced into after pressure is greater than the water vapour pressure in steam boiler upper drum and deliver to steam boiler upper drum by pressure piping again through boiler vapor recovery machine;
(3) steam of being sent here by boiler vapor recovery machine mixes with original steam in steam boiler upper drum, after the further heat treated of steam boiler, delivers to hollow blade drier; It is 13% to moisture content that the slime filter cake that hollow blade drier is 20% by moisture content is further dried.
The microwave power of powder body material microwave drying machine equipment is 300 KW, and power output is 0-320 KW; The rated operating pressure 1.6Mpa of boiler vapor recovery machine, 300 ℃ of nominal operation temperature; Steam boiler adopts coal-fired steam boiler, its rated capacity 10t/h, specified steam pressure 1.25Mpa, 194 ℃ of specified steam temperatures, 105 ℃ of feed temperatures; Hollow blade drier medium is saturated vapor, 184 ℃ of operating temperatures, operating pressure 0.6Mpa.
Powder body material microwave dryer adopts closed drying chamber, carries the belt feeder that coal slime is used to pass this closed drying chamber, and the front end of this belt feeder is near plate basket filter press, and belt feeder end is positioned at hollow blade drier material inlet place; The air-introduced machine that powder body material microwave dryer is installed by its exhaust outlet and pipeline are connected with boiler vapor recovery machine, and boiler vapor recovery machine is connected with steam boiler by pressure piping; The steam delivery outlet of steam boiler is connected with hollow blade drier by pressure piping.
The present invention is organically combined two kinds of drying equipments slime filter cake is carried out to combination drying, when microwave dryer dehydrates slime filter cake, the water heating in coal slime is become to steam, and introduces boiler vapor recovery machine through air-introduced machine and pipeline; After boiler vapor recovery machine is sent into boiler temperature-increasing supercharging, resupply hollow blade dryer as thermal source, continue to dry slime filter cake.Because having adopted water steam to utilize mode, reduce total energy resource consumption, environmental pollution is little, and drying rate is fast, has really realized energy-saving and emission-reduction.
The specific embodiment
For preventing microwave leakage, powder body material microwave dryer adopts closed drying chamber, the belt feeder of carrying coal slime to use is contained in drying chamber, and drying chamber top is equipped with microwave applicator, microwave controller and infrared radiation thermometer, and the speed of belt feeder is regulated by belt feeder speed control.
The slime filter cake of moisture content 30% refers to the water that contains 30 kilograms in every 100 kilograms of slime filter cakes.The steam that powder body material microwave dryer produces is atmospheric pressure, the about 95-100 ℃ of temperature.
It when heated in slime filter cake enters powder body material microwave dryer drying chamber, is entirety heating temperature rise, due to the evaporation of slime filter cake surface moisture, hull-skin temperature is low with respect to nexine, its heat conduction orientation is identical with steam migratory direction, now slime filter cake automatic pulverizing, has increased that the desiccated surface that contacts with thermal medium is long-pending makes dry run heat exchange abundant like this.Due to dehydrating from inside to outside of microwave, the moisture in wet stock is evaporated in air-flow, is sent by microwave dryer exhaust outlet.At the exhaust outlet of powder body material microwave dryer, air-introduced machine and pipeline are housed.
Powder body material microwave dryer model is MEMD-PM-P-300, frequency 2450/915MHz, microwave power 300KW, maximal input 320KW, power output 0-320KW, speed 0-20r/min; Microwave leakage restriction≤3mw/cm
2.
The steam of being discharged by powder body material microwave dryer is introduced boiler vapor recovery machine through air-introduced machine and pipeline, by steam direct weighting, it is reached than entering boiler after the slightly high water vapour pressure of boiler operatiopn pressure again, temperature can reach 75% of the interior temperature of drum, under sealing state with boiler in steam-water mixing, realized completely and to have recycled.
Steam boiler adopts SZL10-1.25-A II type assembling water-tube boiler, rated capacity 10t/h, specified steam pressure 1.25Mpa, 194 ℃ of specified steam temperatures, the steam that powder body material microwave dryer is discharged is sent into steam boiler after the supercharging of boiler vapor recovery machine; The steam delivery outlet of steam boiler is connected with hollow blade drier hot box.Steam boiler is the connector of two drying equipment power conversion, and after heating by the pressurization of steam boiler, the steam that powder body material microwave dryer produces can continue to be used to material dewatering dry.
Hollow blade drier is that a kind of material that makes directly contacts and carries out the drying machine that heat is transmitted with the hollow wedge type heating member of rotation, and hollow blade drier heat medium can be used steam, hot water or high temperature heat conductive oil, and heat medium is inputted from hollow axis hole.Discharging opening place arranges a baffle plate, guarantees controlling level, makes heat-transfer area be covered by material and play one's part to the full.Cold doubtful water and waste gas can heat by foldback back boiler, recycling.Multiple hollow blade dryers stack combinations in vertical direction, becomes a set of composite drying device, reaches the drying purpose of multilayer, multistage, multiple-effect.
The heating surface (area) (HS 800m of hollow blade drier
2, 2 × 4 layers of the numbers of plies, heat medium is saturated vapor, 184 ℃ of operating temperatures, operating pressure 0.6Mpa.Boiler vapor recovery machine model HSJ-10-D, rated operating pressure 1.6Mpa, 300 ℃ of nominal operation temperature.
Claims (3)
1. the method that coal slime is dried, is characterized in that:
(1) slime filter cake of moisture content 30% will be formed with plate basket filter press after coal dust filter-press dehydration, slime filter cake is transported in powder body material microwave dryer and is dried by belt feeder, drying is 20% to slime filter cake moisture content, then is delivered to hollow blade drier by belt feeder and further dries;
(2) air-introduced machine and pipeline that the steam that powder body material microwave dryer produces in dry slime filter cake process is equipped with on by microwave dryer are introduced boiler vapor recovery machine; Be forced into after pressure is greater than the water vapour pressure in steam boiler upper drum and deliver to steam boiler upper drum by pressure piping again through boiler vapor recovery machine;
(3) steam of being sent here by boiler vapor recovery machine mixes with original steam in steam boiler upper drum, after the further heat treated of steam boiler, delivers to hollow blade drier; It is 13% to moisture content that the slime filter cake that hollow blade drier is 20% by moisture content is further dried.
2. the method that coal slime as claimed in claim 1 is dried, the microwave power that it is characterized in that powder body material microwave dryer is 300 KW, the rated operating pressure 1.6Mpa of boiler vapor recovery machine, 300 ℃ of nominal operation temperature; Steam boiler adopts coal-fired steam boiler, its rated capacity 10t/h, and specified steam pressure is 1.25Mpa, 194 ℃ of specified steam temperatures, 105 ℃ of feed temperatures; Hollow blade drier medium is saturated vapor, 184 ℃ of operating temperatures, operating pressure 0.6Mpa.
3. the method that coal slime as claimed in claim 1 is dried, it is characterized in that powder body material microwave dryer adopts closed drying chamber, carry the belt feeder that slime filter cake is used to pass this closed drying chamber, the front end of this belt feeder is near plate basket filter press, and belt feeder end is positioned at hollow blade drier material inlet place; The air-introduced machine that powder body material microwave dryer is installed by its exhaust outlet and pipeline are connected with boiler vapor recovery machine, and boiler vapor recovery machine is connected with steam boiler upper drum by pressure piping; The steam delivery outlet of steam boiler is connected with hollow blade drier by pressure piping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210221818.7A CN102748923B (en) | 2012-07-01 | 2012-07-01 | Method for drying coal slime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210221818.7A CN102748923B (en) | 2012-07-01 | 2012-07-01 | Method for drying coal slime |
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| Publication Number | Publication Date |
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| CN102748923A CN102748923A (en) | 2012-10-24 |
| CN102748923B true CN102748923B (en) | 2014-07-02 |
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| CN201210221818.7A Expired - Fee Related CN102748923B (en) | 2012-07-01 | 2012-07-01 | Method for drying coal slime |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101555A (en) * | 2014-07-16 | 2014-10-15 | 河南东大矿业股份有限公司 | Method for quickly measuring concentrate filter cake attached water through microwave and light-wave oven |
| CN104089843A (en) * | 2014-07-16 | 2014-10-08 | 河南东大矿业股份有限公司 | Method for quickly measuring attached water of tailing cakes in micro-light wave furnace |
| CN105219475B (en) * | 2015-10-28 | 2018-10-19 | 中国矿业大学 | Lignite upgrading system and its method for upgrading |
| CN111991896B (en) * | 2020-09-11 | 2022-08-23 | 新乡市万和过滤技术股份公司 | Novel multifunctional ceramic filter |
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| CN201003900Y (en) * | 2006-10-09 | 2008-01-09 | 米洁 | Mud material drying system |
| CN201206835Y (en) * | 2008-04-03 | 2009-03-11 | 浙江大学 | Sludge treatment system utilizing pulverized coal boiler of power station |
| CN201517880U (en) * | 2009-09-27 | 2010-06-30 | 济南市琦泉热电有限责任公司 | Coal slime drying system |
| CN201569260U (en) * | 2009-12-28 | 2010-09-01 | 山东天力干燥设备有限公司 | Indirect heat-exchange rotation superheating steam brown coal drying system |
| CN102175074A (en) * | 2010-11-30 | 2011-09-07 | 李柏荣 | Lignitic coal modifying processing system and technology |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
| KR101144274B1 (en) * | 2010-02-26 | 2012-05-14 | 한국전력공사 | apparatus for drying coal and system for upgrading coal quality including the same |
-
2012
- 2012-07-01 CN CN201210221818.7A patent/CN102748923B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201003900Y (en) * | 2006-10-09 | 2008-01-09 | 米洁 | Mud material drying system |
| CN201206835Y (en) * | 2008-04-03 | 2009-03-11 | 浙江大学 | Sludge treatment system utilizing pulverized coal boiler of power station |
| CN201517880U (en) * | 2009-09-27 | 2010-06-30 | 济南市琦泉热电有限责任公司 | Coal slime drying system |
| CN201569260U (en) * | 2009-12-28 | 2010-09-01 | 山东天力干燥设备有限公司 | Indirect heat-exchange rotation superheating steam brown coal drying system |
| KR101144274B1 (en) * | 2010-02-26 | 2012-05-14 | 한국전력공사 | apparatus for drying coal and system for upgrading coal quality including the same |
| CN102175074A (en) * | 2010-11-30 | 2011-09-07 | 李柏荣 | Lignitic coal modifying processing system and technology |
| CN102207350A (en) * | 2011-05-19 | 2011-10-05 | 湖南科达粉体工程有限公司 | Method for carrying out fluidized drying on lignite by microwaves |
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| CN102748923A (en) | 2012-10-24 |
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