CN203229504U - High-moisture lignite coal grinding and drying device - Google Patents
High-moisture lignite coal grinding and drying device Download PDFInfo
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- CN203229504U CN203229504U CN 201320076018 CN201320076018U CN203229504U CN 203229504 U CN203229504 U CN 203229504U CN 201320076018 CN201320076018 CN 201320076018 CN 201320076018 U CN201320076018 U CN 201320076018U CN 203229504 U CN203229504 U CN 203229504U
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Abstract
The utility model provides a high-moisture lignite coal grinding and drying device. The high-moisture lignite coal grinding and drying device is characterized by comprising a fluidized bed dryer connected with a deduster; the deduster is connected with an inlet of a mixer; the deduster is connected with a low-pressure steam heater, a fluidized fan and a booster fan; the fluidized fan is connected with the fluidized bed dryer; the booster fan is connected with a steam coil pipe of the fluidized bed dryer; the fluidized bed dryer is connected with an inlet of the mixer; the mixer is connected with a coal grinding machine connected with a pulverized coal filter; a pulverized coal outlet of the pulverized coal filter is connected with a pulverized coal bin; a gas outlet of the pulverized coal filter is connected with a circulating fan; the circulating fan is connected with a cutter; the cutter is connected with the lower-pressure steam heater connected with an inert gas generator; the inert gas generator is connected with the coal grinding machine. The high-moisture lignite coal grinding and drying device provided by the utility model is suitable for drying and pulverizing coals of high-moisture lignite and the like. The particle size distribution and water content of the prepared pulverized coal are adaptive to the requirements of a gasifying furnace.
Description
Technical field
The utility model relates to a kind of brown coal coal-grinding and drying installation for air flow bed coal gasification system, especially for the mill coal drying device of brown coal hydrogasification, the high-moisture brown coal is ground into the coal dust of release mesh and moisture, is used for the raw material of coal gasification.
Background technology
Brown coal are coal resources that a kind of degree of coalification only is higher than peat, according to incompletely statistics, and about 1,000,000,000,000 tons of whole world brown coal reserves, and Chinese brown coal reserves reach 2,118 hundred million tons, mainly concentrate on east Inner Mongolia, Heilungkiang and the Yunnan-Guizhou Plateau.Development brown coal efficient technique of rainwater utilization, expansion brown coal development and use space are one of projects of current China power-saving technology policy encourage growth.
Coal gas fluidized bed gasification technology is the gordian technique that extensive high-efficiency cleaning utilizes brown coal, the synthetic gas that gasification produces can be for the synthesis of Sweet natural gas, staple product such as synthetic ammonia and methyl alcohol, the brown coal entrained flow bed gasification technology has the branch of wet method, dry method, four nozzle coal water slurry gasifications of GE single nozzle coal water slurry gasification, East China University of Science and Xibei Chemical Inst's polynary slurry gasification need to gasify after the coal-grinding slurrying for wet entrained flow bed gasification; Shell, Prenflo multi-nozzle dry coal powder gasification and GSP single nozzle dry coal powder gasification etc. are the dry method entrained flow gasification.
The dried coal powder gasification technology adopts the brown coal charging, general requirement brown coal coal dust moisture content is lower than 8-12%, the size-grade distribution of type is granularity less than 90 microns coal dust greater than 90%, granularity less than 5 microns coal dust less than 10%, because most of brown coal water-content is higher, the brown coal of certain areas even moisture are up to 50-60%, therefore brown coal being carried out drying is the key of extensive brown coal hydrogasification technology with the coal dust that grinds the release mesh distribution, for rationally and efficiently utilizing lignite resource to have very important meaning.
Utility model patent CN 101015814 discloses a kind of coal-grinding and drying means, solves the insoluble inerting problem of coal dust preparation system in the existing working method that raw coal is ground into coal dust.The utility model has realized that abrasive dust and drying combine, the requirement of inerting, closed cycle, high efficiency separation, exhaust balance, middle bunker, have system simple, easy and simple to handle, take up an area of little, less investment, reliability higher advantage.But this patent can not adapt to the grinding and drying of brown coal of high moisture content.
Summary of the invention
The purpose of this utility model be at brown coal hydrogasification provide a kind of safety and environmental protection and efficiently brown coal grind and drying installation.Adopt the closed cycle flow process, the steam that the system that takes full advantage of is self-produced and rare gas element, whole mill coal drying system sealing performance is good, safety and environmental protection, can effectively prevent the risk of spontaneous combustion of pulverized coal and blast in the mill coal drying process, the high-moisture brown coal are had adaptability preferably, grind the requirement that meets gasification with dried coal powder size and moisture.
In order to achieve the above object, the utility model provides a kind of high-moisture brown coal coal-grinding and drying installation, it is characterized in that, comprise fluidized bed dryer, the secondary steam of fluidized bed dryer is connected the entrance of fly-ash separator with the brown coal mixture outlet, the brown coal outlet of fly-ash separator connects the entrance of mixing tank, the vapour outlet of fly-ash separator connects the steam-in of low-pressure steam well heater, the entrance of fluidisation blower fan and the entrance of booster fan, the outlet of fluidisation blower fan connects the fluidized gas entrance of fluidized bed dryer, the outlet of booster fan connects the steam coils of fluidized bed dryer, the dry brown coal outlet of fluidized bed dryer connects the entrance of mixing tank, the outlet of mixing tank connects the entrance of coal pulverizer, the outlet of coal pulverizer connects the entrance of fine coal strainer, the discharge of fine coal strainer connects Pulverized Coal Bin, the pneumatic outlet of fine coal strainer connects the entrance of recirculation blower, the outlet of recirculation blower connects the entrance of dispenser, first outlet of dispenser connects atmosphere, second outlet of dispenser connects the inert gas entrance of low-pressure steam well heater, the rare gas element outlet of low-pressure steam well heater connects the entrance of inert gas generator, and the outlet of inert gas generator connects the entrance of coal pulverizer.
Further, the connecting pipeline at dispenser and low-pressure steam well heater is provided with inert gas entrance.
Further, described coal pulverizer is for driving the medium-speed pulverizer of static separation device.
Further, described fine coal strainer adopts the sack cleaner of anti-electrostatic, antisweat and anti-spontaneous combustion.
Further, be provided with online oxygen analyzer at fine coal filter outlet and inert gas generator outlet.
Further, CO on-line monitoring instrument is set in the circulating line behind the fine coal strainer.
The utility model also provides a kind of high-moisture brown coal coal-grinding and drying means, it is characterized in that, adopt above-mentioned brown coal coal-grinding and drying installation, concrete steps are: the brown coal after the fragmentation are sent into carried out drying in the fluidized bed dryer, superheated vapour is sent into fluidized bed dryer as fluidized gas, the drying source of fluidized bed dryer is low-pressure steam, the water of condensation that fluidized bed dryer produces is discharged, the secondary steam that fluidized bed dryer is produced separates through fly-ash separator with the brown coal mixture, the isolated secondary steam part of fly-ash separator is sent into fluidized bed dryer through the fluidisation blower fan to be recycled as fluidized gas, a part is sent into the steam coils of fluidized bed dryer for dry brown coal after improving pressure through booster fan, last part enters the low-pressure steam superheater and is used for heating rare gas element from dispenser, dried brown coal mix the back with the brown coal that come from fly-ash separator through mixing tank and enter coal pulverizer respectively with the dry gas that comes from inert gas generator, dried brown coal are milled into coal dust at coal pulverizer, obtain further drying simultaneously, qualified coal dust enters in the fine coal strainer with gaseous mixture and separates, isolated coal dust enters Pulverized Coal Bin, the gas of separating is after recirculation blower enters dispenser, moisture content in the part emptying regulation system, most of gas circulation enters the low-pressure steam heater heats and enter inert gas generator after suitable temperature, sends into coal pulverizer as dry gas after mixing with hot flue gas and recycles.
Further, the moisture content of the brown coal after the described fragmentation is 25-65%, and described dried brown coal moisture content is 8-12%; The pressure of described low-pressure steam is 0.5Mpa, and drying temperature is 120-150 ℃.
Further, the gas temperature of the dry gas entrance of described coal pulverizer is 180-400 ℃, and the gas temperature of dry gas outlet is 105-130 ℃, dew-point temperature 40-80 ℃.
Further, described rare gas element is nitrogen, CO
2, low-pressure steam or their gas mixture.
Further, described rare gas element is preferably nitrogen or CO
2
Further, the synthetic gas that the fuel of described inert gas generator adopts gasification to produce goes into operation with diesel oil or Sweet natural gas.
Further, the oxygen level of described fine coal filter outlet and inert gas generator outlet is lower than 8%.
Further, the moisture of the coal dust of described coal pulverizer outlet is 2%.
Brown coal need just can enter moisture eliminator through after the precrushing in the utility model, superheated vapour is as the fluidizing medium of moisture eliminator, accelerate the heat and mass of steam and brown coal, the moisture eliminator bed temperature is even, can local superheating not occur and causes brown coal pyrolysis or spontaneous combustion; Saturation steam is by heat exchange coil and brown coal indirect heat exchange in the moisture eliminator, and the steam part after the heat exchange is discharged as water of condensation, and a part of recycle has improved the efficient of moisture eliminator; Can adapt to the dry requirement of different brown coal moisture by steam regulation flow and pressure parameter; Drying process adopts steam as fluidisation and heat transferring medium, brown coal are dry in this inert atmosphere of steam, the spontaneous combustion of brown coal in drying process and the risk of blast have been eliminated, the temperature of strict control dehumidification system is 120-150 ℃, simple physical change just takes place in brown coal, can not produce volatile matter and separate out tar.
Drying medium in the utility model is the hot flue gas of inert gas generator generation and the mixed gas of rare gas element, coal pulverizer is for driving the medium-speed pulverizer of static separation device, described medium-speed pulverizer is provided with the sealing wind system, be used for preventing that coal dust from entering bearing and axle envelope, the fine coal strainer adopts the fly-ash separator of anti-electrostatic, antisweat and anti-spontaneous combustion, adopt the primary dust removing can simplified apparatus and flow process, running resistance be little, and the dust concentration after the dedusting can reach environmental requirement; In order to prevent fine coal strainer dewfall, insulation and companion's thermic devices can be set around the fine coal strainer; Speed venting or use diesel oil or Sweet natural gas that the combustion air that the use gas blower is sent here during the inert gas generator operation and gasification system produce adopt LPG when pilot burner and starting ignition; Recirculation blower keeps the gas flow of this system, and recirculation blower adopts and can prevent the blower fan that weares and teares.Be provided with online oxygen analyzer at fine coal filter outlet and inert gas generator outlet, online oxygen analyzer inserts the DCS Controlling System, in case system's oxygen level surpasses set(ting)value, topping up, reach the purpose that reduces oxygen level, guarantee the operating safety of system; In order to prevent spontaneous combustion of pulverized coal, be provided with CO on-line monitoring instrument in the circulating line behind the fine coal strainer, when the CO content overproof, monitor will be reported to the police.
The coal wide ranges that the utility model is suitable for, be particularly useful for drying and the powder process of coals such as high-moisture brown coal, the requirement that the coal powder size distribution of preparation and water content adapt to vapourizing furnace, whole coal-grinding and dehumidification system operational outfit are few, running resistance is little, flow process is succinct, system's operating safety, reliable, environmental protection.
Description of drawings
Fig. 1 is high-moisture brown coal coal-grinding and drying installation synoptic diagram.
Embodiment
For the utility model is become apparent, now with preferred embodiment, and conjunction with figs. is described in detail below.
Embodiment
As shown in Figure 1, be high-moisture brown coal coal-grinding and drying installation synoptic diagram, described high-moisture brown coal coal-grinding and drying installation are made up of fluidized bed dryer, mixing tank, coal pulverizer, fine coal strainer, Pulverized Coal Bin, recirculation blower, dispenser, low-pressure steam heat air, inert gas generator, booster fan, fly-ash separator and fluidized wind machine.The secondary steam of fluidized bed dryer is connected the entrance of fly-ash separator with the brown coal mixture outlet, the brown coal outlet of fly-ash separator connects the entrance of mixing tank, the vapour outlet of fly-ash separator connects the steam-in of low-pressure steam well heater, the entrance of fluidisation blower fan and the entrance of booster fan, the outlet of fluidisation blower fan connects the fluidized gas entrance of fluidized bed dryer, the outlet of booster fan connects the steam coils of fluidized bed dryer, the dry brown coal outlet of fluidized bed dryer connects the entrance of mixing tank, the outlet of mixing tank connects the entrance of coal pulverizer, the outlet of coal pulverizer connects the entrance of fine coal strainer, the discharge of fine coal strainer connects Pulverized Coal Bin, the pneumatic outlet of fine coal strainer connects the entrance of recirculation blower, the outlet of recirculation blower connects the entrance of dispenser, first outlet of dispenser connects atmosphere, second outlet of dispenser connects the inert gas entrance of low-pressure steam well heater, the rare gas element outlet of low-pressure steam well heater connects the entrance of inert gas generator, and the outlet of inert gas generator connects the entrance of coal pulverizer.Connecting pipeline at dispenser and low-pressure steam well heater is provided with inert gas entrance, adds a certain amount of rare gas element on recycle circuit as required, guarantees the inerting of whole mill coal drying system.Described coal pulverizer is for driving the medium-speed pulverizer of static separation device.Described fine coal strainer adopts the sack cleaner of anti-electrostatic, antisweat and anti-spontaneous combustion.Be provided with online oxygen analyzer in the outlet of fine coal filter outlet and inert gas generator, in case oxygen content exceeds standard, add a certain amount of rare gas element, guarantee the inerting of whole mill coal drying system, the long-pending content of the oxysome of Controlling System is no more than 8%.CO on-line monitoring instrument is set in the circulating line behind the fine coal strainer, and when the CO content overproof, monitor will be reported to the police.
Adopt brown coal coal-grinding and the drying means of said apparatus to be: to be that 30% brown coal are sent into and carried out drying in the fluidized bed dryer with the granularity after the fragmentation less than the moisture content of 30mm, superheated vapour is sent into fluidized bed dryer as fluidized gas, the drying source of fluidized bed dryer is the low-pressure steam of 0.5MPa, drying temperature is 130 ℃, the moisture content of the brown coal after the fragmentation is 30%, and described is 19% through the dried brown coal moisture content of fluidized bed dryer; The water of condensation that fluidized bed dryer produces is discharged, the secondary steam that fluidized bed dryer is produced separates through fly-ash separator with the brown coal mixture, the isolated secondary steam part of fly-ash separator is sent into fluidized bed dryer through the fluidisation blower fan to be recycled as fluidized gas, a part is sent into the steam coils of fluidized bed dryer for dry brown coal after improving pressure through booster fan, last part enters the low-pressure steam superheater and is used for heating rare gas element from dispenser, described rare gas element is nitrogen, dried brown coal moisture content is 10%, it mixes the back with the brown coal that come from fly-ash separator through mixing tank and enters coal pulverizer respectively with the dry gas that comes from inert gas generator, the gas temperature of dry gas entrance is 280 ℃, the gas temperature of dry gas outlet is 110 ℃, and dew-point temperature is 60 ℃; Dried brown coal are milled into coal dust at coal pulverizer, obtain further drying simultaneously, moisture content can reach 2%, qualified coal dust enters in the fine coal strainer with gaseous mixture and separates, isolated coal dust enters Pulverized Coal Bin, the gas of separating is after recirculation blower enters dispenser, moisture content in the part emptying regulation system, most of gas circulation enters the low-pressure steam heater heats and enter inert gas generator after suitable temperature, sends into coal pulverizer as dry gas after mixing with hot flue gas and recycles.The fuel of inert gas generator adopts Sweet natural gas, and igniting and pilot burner use LPG.
Claims (6)
1. a high-moisture brown coal coal-grinding and drying installation, it is characterized in that, comprise fluidized bed dryer, the secondary steam of fluidized bed dryer is connected the entrance of fly-ash separator with the brown coal mixture outlet, the brown coal outlet of fly-ash separator connects the entrance of mixing tank, the vapour outlet of fly-ash separator connects the steam-in of low-pressure steam well heater, the entrance of fluidisation blower fan and the entrance of booster fan, the outlet of fluidisation blower fan connects the fluidized gas entrance of fluidized bed dryer, the outlet of booster fan connects the steam coils of fluidized bed dryer, the dry brown coal outlet of fluidized bed dryer connects the entrance of mixing tank, the outlet of mixing tank connects the entrance of coal pulverizer, the outlet of coal pulverizer connects the entrance of fine coal strainer, the discharge of fine coal strainer connects Pulverized Coal Bin, the pneumatic outlet of fine coal strainer connects the entrance of recirculation blower, the outlet of recirculation blower connects the entrance of dispenser, first outlet of dispenser connects atmosphere, second outlet of dispenser connects the inert gas entrance of low-pressure steam well heater, the rare gas element outlet of low-pressure steam well heater connects the entrance of inert gas generator, and the outlet of inert gas generator connects the entrance of coal pulverizer.
2. high-moisture brown coal coal-grinding as claimed in claim 1 and drying installation is characterized in that, are provided with inert gas entrance at the connecting pipeline of dispenser and low-pressure steam well heater.
3. high-moisture brown coal coal-grinding as claimed in claim 1 and drying installation is characterized in that, described coal pulverizer is for driving the medium-speed pulverizer of static separation device.
4. high-moisture brown coal coal-grinding as claimed in claim 1 and drying installation is characterized in that, described fine coal strainer adopts the sack cleaner of anti-electrostatic, antisweat and anti-spontaneous combustion.
5. high-moisture brown coal coal-grinding as claimed in claim 1 and drying installation is characterized in that, are provided with online oxygen analyzer at fine coal filter outlet and inert gas generator outlet.
6. high-moisture brown coal coal-grinding as claimed in claim 1 and drying installation is characterized in that, CO on-line monitoring instrument is set in the circulating line behind the fine coal strainer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076018 CN203229504U (en) | 2013-02-18 | 2013-02-18 | High-moisture lignite coal grinding and drying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076018 CN203229504U (en) | 2013-02-18 | 2013-02-18 | High-moisture lignite coal grinding and drying device |
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| CN203229504U true CN203229504U (en) | 2013-10-09 |
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| CN 201320076018 Withdrawn - After Issue CN203229504U (en) | 2013-02-18 | 2013-02-18 | High-moisture lignite coal grinding and drying device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146454A (en) * | 2013-02-18 | 2013-06-12 | 上海锅炉厂有限公司 | High-moisture brown coal pulverizing and drying apparatus and method thereof |
| CN105327765A (en) * | 2015-12-10 | 2016-02-17 | 惠生工程（中国）有限公司 | High-moisture low-rank coal pulverizing and water recycling system and method |
| CN105605600A (en) * | 2015-12-21 | 2016-05-25 | 中国矿业大学 | Method for using high-water-content low-ash-content lignite |
| CN110433922A (en) * | 2018-09-21 | 2019-11-12 | 浙江芸洁科技有限公司 | A kind of processing method of konjaku powder |
-
2013
- 2013-02-18 CN CN 201320076018 patent/CN203229504U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146454A (en) * | 2013-02-18 | 2013-06-12 | 上海锅炉厂有限公司 | High-moisture brown coal pulverizing and drying apparatus and method thereof |
| CN103146454B (en) * | 2013-02-18 | 2015-02-18 | 上海锅炉厂有限公司 | High-moisture brown coal pulverizing and drying apparatus and method thereof |
| CN105327765A (en) * | 2015-12-10 | 2016-02-17 | 惠生工程（中国）有限公司 | High-moisture low-rank coal pulverizing and water recycling system and method |
| CN105327765B (en) * | 2015-12-10 | 2018-09-04 | 惠生工程（中国）有限公司 | A kind of high-moisture low-order coal powder and water reclamation system and method |
| CN105605600A (en) * | 2015-12-21 | 2016-05-25 | 中国矿业大学 | Method for using high-water-content low-ash-content lignite |
| CN110433922A (en) * | 2018-09-21 | 2019-11-12 | 浙江芸洁科技有限公司 | A kind of processing method of konjaku powder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131009 Effective date of abandoning: 20150218 |
|
| RGAV | Abandon patent right to avoid regrant |