CN103822441A - Coal drying method through inert gas circulating - Google Patents
Coal drying method through inert gas circulating Download PDFInfo
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- CN103822441A CN103822441A CN201210461010.6A CN201210461010A CN103822441A CN 103822441 A CN103822441 A CN 103822441A CN 201210461010 A CN201210461010 A CN 201210461010A CN 103822441 A CN103822441 A CN 103822441A
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Abstract
The invention relates to a coal drying method through inert gas circulating. The method includes the scheme that a washing tower is adopted to wash, cool and dehumidify dedusted dry tail gas for recycling, so that safety of a coal drying system is improved; negative-pressure flash evaporation technology is adopted, so that clean recovery of water in the dry tail gas can be realized, and 'white dragon' phenomena of the dry exhaust gas can be solved.
Description
Technical field
The present invention relates to coal damping, technical field of drying, belong to a kind of coal drying method of inert gas circulation, the method is also used in the dry of other inflammable, explosive material.
Background technology
Coal is dried the workshop section that is absolutely necessary in the coal comprehensive processing and utilization processes such as coal damping, coal gasification, coal liquefaction, present stage mainly contains the air-flowing type coal dry technology that adopts the heat-conduction-type coal dry technology that steam or conduction oil are thermal source and adopt coal that flue gas is thermal source directly to contact with hot flue gas, regardless of being that the dried tail gas of its coal of which kind of technology is all directly to discharge after dedusting.Because coal dust is inflammable, explosive, although all control the oxygen content of carrier gas or flue gas in dry run, in dry run, there is spontaneous combustion of pulverized coal or dodge quick-fried preventing.But due to the factor such as misoperation or equipment dependability, still easily there is spontaneous combustion of pulverized coal or dodge quick-fried in coal drying system.Therefore, in order to reduce as far as possible because dried tail gas discharges the unnecessary heat loss causing, generally very high by the dew-point temperature control of emission all of dry run, this just inevitably there will be the tail gas giving off to be " Bai Long " phenomenon.
Summary of the invention
In view of above-mentioned, the present invention proposes a kind of coal drying method of inert gas circulation, and to improve the security performance of coal drying system, and the application of the method can be by dry coal steam recovery out, " Bai Long " phenomenon of avoiding dried tail gas to produce.
Object of the present invention can be achieved through the following technical solutions:
Through fragmentation, deironing, except the coal dust of foreign matter is after surge bunker buffering, after measuring belt scale Weighing, sent in steam-tube rotatory dryer by feeding spiral conveyer, in wet coal and steam-tube rotatory dryer, be connected with after the abundant contact heat-exchanging of heat exchanger tube of steam, moisture is evaporated, obtain, after qualified products, being transported to downstream units by discharging spiral conveyor; The water vapour producing in dry run and a small amount of dust are caused the dedusting of sack cleaner inner filtration by 1# circulating fan, the dust filtering down is discharged by rotary valve, tail gas after filtration, purification enters in scrubbing tower, with the washing of washings counter current contacting, cooling, dehumidifying, tail gas after part dehumidifying, after 1# circulating fan and the heating of 1# heater, enters steam-tube rotatory dryer as carrier gas; After mixing with steam-tube rotatory dryer outlet tail gas after tail gas after part dehumidifying heats by 2# circulating fan and 2# heater, enter sack cleaner; Wash with scrubbing tower the water getting off and mix, washings enter flash tank flash distillation through water circulating pump, and the steam that flash distillation produces reclaims after adopting air cooling or water chiller condensation.
The beneficial effect of advantage of the present invention and generation is:
(1) the dry carrier gas of whole coal drying system adopts inert gas circulation, and security of system is reliable.
(2) system is provided with 2# circulating fan and the adjustable deduster entrance of 2# heater dried tail gas temperature, effectively prevents deduster dewfall.
(3) dried tail gas is after sack cleaner filters, adopt scrubbing tower washing, cooling, dehumidifying, tail gas after dehumidifying enters steam-tube rotatory dryer as carrier gas after heating by circulating fan and heater, after steam-tube rotatory dryer outlet tail gas mixes, enters sack cleaner; Tail gas after sack cleaner filtration, purification enters scrubbing tower, and the hydromining after washing reclaims with the cleaning that the method for flash distillation cooling can realize water, and has solved emission " Bai Long " phenomenon simultaneously.
(4) flash tank and scrubbing tower are integration apparatus, and cooling rear washings recycle.
Accompanying drawing explanation
The coal drying process figure of Fig. 1 inert gas circulation.
In figure: 1-surge bunker 2-measuring belt scale 3-feeding spiral conveyer 4-steam-tube rotatory dryer 5-discharging spiral conveyor 6-1# circulating fan 7-sack cleaner 8-rotary valve 9-scrubbing tower 10-1# heater 11-2# circulating fan 12-2# heater 13-water circulating pump 14-flash tank 15-air cooling (or water-cooled) unit.
The specific embodiment
Below in conjunction with accompanying drawing, invention technical scheme is further described again:
Through fragmentation, deironing, except the coal dust of foreign matter is after surge bunker 1 buffering, after measuring belt scale 2 Weighings, sent in steam-tube rotatory dryer 4 by feeding spiral conveyer 3, in wet coal and steam-tube rotatory dryer 4, be filled with after the abundant contact heat-exchanging of tubulation of steam, moisture is evaporated, obtain after qualified products, be transported to downstream units by discharging spiral conveyor 5, the water vapour producing in dry run and a small amount of dust are caused sack cleaner 7 inner filtration dedustings by 1# circulating fan 6, the dust filtering down is discharged by rotary valve 8, tail gas after filtration, purification enters in scrubbing tower 9, wash with washings counter current contacting, cooling, dehumidifying, tail gas after part dehumidifying is after 1# circulating fan 6 and 10 heating of 1# heater, together enter steam-tube rotatory dryer 4 with nitrogen as carrier gas, the nitrogen amount that this process can pass into by adjusting the frequency converter of 1# circulating fan 6 or the 6 entrance electric control valve gate controls of 1# circulating fan steam-tube rotatory dryer 4 makes steam-tube rotatory dryer 4 export tail gas dew-point temperature between 80 ℃ ~ 95 ℃, tail gas after part dehumidifying exports after tail gas mixes and enters sack cleaner 7 with steam-tube rotatory dryer 4 after heating by 2# circulating fan 11 and 2# heater 12, this process enters the exhaust temperature of sack cleaner 7 by adjusting the heating steam amount control of 2# heater 12, guarantee that the exhaust temperature that enters sack cleaner 7 prevents deduster dewfall higher than 15 ℃ of dew-point temperatures, wash with scrubbing tower the water getting off and mix, washings enter flash tank 14 flash distillations through water circulating pump 13, and the steam that flash distillation produces reclaims after adopting air cooling or water chiller 15 condensations.
The whole drying system dry run of the present invention adopts nitrogen circulation, in system, oxygen content is normally lower than 8%, be less than the explosion limit 12% of coal dust, can guarantee the operation that security of system is stable, and system is provided with oxygen content detecting system, when abnormal conditions appear in system, oxygen content exceedes 8%, can in system, supplement nitrogen fast, reduce system oxygen content.
Claims (2)
1. a coal drying method for inert gas circulation, is characterized in that:
Through fragmentation, deironing, except the coal dust of foreign matter is after surge bunker (1) buffering, after measuring belt scale (2) Weighing, sent in steam-tube rotatory dryer (4) by feeding spiral conveyer (3), in wet coal and steam-tube rotatory dryer (4), be connected with after the abundant contact heat-exchanging of heat exchanger tube of steam, moisture is evaporated, obtain after qualified products, be transported to downstream units by discharging spiral conveyor (5); The water vapour producing in dry run and a small amount of dust are caused sack cleaner (7) inner filtration dedusting by 1# circulating fan (6), the dust filtering down is discharged by rotary valve (8), tail gas after filtration, purification enters in scrubbing tower (9), with the washing of washings counter current contacting, cooling, dehumidifying, tail gas after part dehumidifying, after 1# circulating fan (6) and 1# heater (10) heating, enters steam-tube rotatory dryer (4) as carrier gas; After mixing with steam-tube rotatory dryer (4) outlet tail gas after tail gas after part dehumidifying heats by 2# circulating fan (11) and 2# heater (12), enter sack cleaner (7), washing with scrubbing tower the water getting off mixes, washings enter flash tank (14) flash distillation through water circulating pump (13), and the steam that flash distillation produces reclaims after adopting air cooling or water chiller (15) condensation.
2. the coal drying method of a kind of inert gas circulation according to claim 1, it is characterized in that adopting dry carrier gas is nitrogen, or is argon gas; Or be neon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210461010.6A CN103822441A (en) | 2012-11-16 | 2012-11-16 | Coal drying method through inert gas circulating |
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| CN201210461010.6A CN103822441A (en) | 2012-11-16 | 2012-11-16 | Coal drying method through inert gas circulating |
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| CN103822441A true CN103822441A (en) | 2014-05-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179537A (en) * | 2014-08-18 | 2014-12-03 | 北京电力设备总厂 | Brown coal drying power generating system capable of recycling water in coal and implementation method of brown coal drying power generating system |
| CN104501576A (en) * | 2015-01-13 | 2015-04-08 | 天华化工机械及自动化研究设计院有限公司 | System for utilizing indirect air cooling technology to recover steam in dry tail gas and application method thereof |
| CN105180638A (en) * | 2015-08-03 | 2015-12-23 | 天华化工机械及自动化研究设计院有限公司 | Venturi type powered coal cooling method with inert gas circulation |
| CN107152844A (en) * | 2017-07-04 | 2017-09-12 | 江西升华新材料有限公司 | Drying machine and material handling system |
| CN107843073A (en) * | 2017-11-24 | 2018-03-27 | 合肥真萍电子科技有限公司 | A kind of special PI anaerobics curing oven of integrated circuit wafer level |
| CN108484253A (en) * | 2018-02-26 | 2018-09-04 | 中向旭曜科技有限公司 | A kind of coal base nutrient for plants preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104179537A (en) * | 2014-08-18 | 2014-12-03 | 北京电力设备总厂 | Brown coal drying power generating system capable of recycling water in coal and implementation method of brown coal drying power generating system |
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| CN104501576A (en) * | 2015-01-13 | 2015-04-08 | 天华化工机械及自动化研究设计院有限公司 | System for utilizing indirect air cooling technology to recover steam in dry tail gas and application method thereof |
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| CN105180638A (en) * | 2015-08-03 | 2015-12-23 | 天华化工机械及自动化研究设计院有限公司 | Venturi type powered coal cooling method with inert gas circulation |
| CN105180638B (en) * | 2015-08-03 | 2017-05-10 | 天华化工机械及自动化研究设计院有限公司 | Venturi type powered coal cooling method with inert gas circulation |
| CN107152844A (en) * | 2017-07-04 | 2017-09-12 | 江西升华新材料有限公司 | Drying machine and material handling system |
| CN107843073A (en) * | 2017-11-24 | 2018-03-27 | 合肥真萍电子科技有限公司 | A kind of special PI anaerobics curing oven of integrated circuit wafer level |
| CN108484253A (en) * | 2018-02-26 | 2018-09-04 | 中向旭曜科技有限公司 | A kind of coal base nutrient for plants preparation method |
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Application publication date: 20140528 |