CN105222528B - A kind of fluidized bed coal is dried and water recovery method - Google Patents
A kind of fluidized bed coal is dried and water recovery method Download PDFInfo
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- CN105222528B CN105222528B CN201510687811.8A CN201510687811A CN105222528B CN 105222528 B CN105222528 B CN 105222528B CN 201510687811 A CN201510687811 A CN 201510687811A CN 105222528 B CN105222528 B CN 105222528B
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Abstract
Dried the present invention relates to a kind of fluidized bed coal and water recovery method, the method is comprised the following steps：(1) raw coal sets the fluidized bed dryers heat exchange of three groups of heating tubes in, respectively obtains 80 DEG C of coal dust after drying, saturation lime set A, dries tail gas containing dust and vapor；Containing dust and vapor dry tail gas through gas solid separation after, to respectively obtain and dry tail gas after dust and dedusting；(3) the most of through heat exchange of tail gas is dried after dedusting, respectively obtain 120 DEG C and dry tail gas and steam；A small amount of tail gas that dries is emptied to maintain the pressure balance of system；(4) the another part dried in tail gas after dedusting then carries out indirect counterflow washing, heat exchange, and tail gas is dried after respectively obtaining the water after washing and washing；After washing dry tail gas it is heated enter into be circulated as carrier gas in fluidized bed dryer use；Used as thermal source, another part water is used a part of water of water after washing as recovery.The present invention can improve the security of system, and environmental protection.
Description
Technical field
Dry and returned with water the present invention relates to the energy conservation field in industrial process, more particularly to a kind of fluidized bed coal
Receiving method.
Background technology
Coal is a kind of important energy, is also the metallurgical, important source material of chemical industry, in the proved reserves in China and the world
Very abundant, is the important component of world energy sources composition.The comprehensive utilization of coal and develop at this stage with it is following
One important research direction.In the existing coal reserves verified, raw coal typically contains moisture higher, need to carry out predry to it
Dry treatment, reduces the moisture of raw coal, can be used as the raw material of Coal Chemical Industry or the energy after improving its calorific value, with cleaning
The development of coal technology and energy-saving, environmentally friendly requirement, raw coal dry a key technology as coal comprehensive utilization.
In existing industry, it is dry that the pre-dried technique of raw coal mainly has heat smoke to turn round drum dried, steam pipe revolving drum
Dry, pipe drier is dried：1. heat smoke revolution drum dried, main to use heat smoke as drying source, is removed using whirlwind
Dirt device, sack cleaner will dry tail gas and carry out dedusting, and the tail gas that dries after dedusting is directly discharged into air；2. steam pipe revolution
Drying machine and pipe drier are dried, and mainly using low, middle pressure steam as drying source, air is used as carrier gas is dried
After sack cleaner dedusting, dry tail gas and be directly discharged into air.But above-mentioned drying mode is primarily present following shortcoming：
(1) coal dust has inflammable, explosive characteristic, in drying process, when the oxygen content in drying carrier gas is exceeded, and coal dust
Easily there is burning, the danger of blast, due to steam-tube rotatory dryer and pipe drier dry use air as it is dry
Dry carrier gas, so as to increased the danger in drying process, the capital equipment of existing drying process is dynamic equipment, causes to leak into
The air capacity of system increases, and the danger of system is further improved.
(2) dry containing substantial amounts of dust in tail gas, though discharged by after sack cleaner dedusting, in tail gas
Still contain more dust, be extremely difficult to the index of air environmental requirement, air is polluted.
(3) tail gas is dried by dried, its temperature reaches 90 ~ 110 DEG C, directly drains into air, make to be carried in tail gas
Heat can not be reasonably utilized and waste.
(4) the moisture for being evaporated in drying process causes a large amount of wastes of water resource with tail gas together discharge system is dried.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of safe and environment-friendly fluidized bed coal and dry and Water Sproading side
Method.
To solve the above problems, a kind of fluidized bed coal of the present invention is dried and water recovery method, is comprised the following steps：
(1) the raw coal from up-stream system is first into being cached in run coal bin, is then entered by raw coal blocking valve again
Enter to interior and set three groups of fluidized bed dryers of heating tube, raw coal is carried out with 80 ~ 90 DEG C of hot water in first group of heating tube first
Indirect heat exchange, by after first group of heating tube heating, hot water temperature is entered into scrubbing tower after being reduced to 50 ~ 70 DEG C, and
Coal dust temperature reaches 60 ~ 80 DEG C, then carries out indirect heat exchange with low, the middle pressure steam in second group, the 3rd group of heating tube respectively,
Respectively obtain dry after 80 DEG C coal dust, saturation lime set A, 90 ~ 110 DEG C containing dust and vapor dry tail gas；It is described dry
80 DEG C of coal dust is discharged by product coal blocking valve after dry, obtains product coal；And saturation lime set then discharge system；
(2) described 90 ~ 110 DEG C containing dust and vapor dry tail gas and enter into sack cleaner, while low pressure nitrogen
Gas is entered into sack cleaner as purge gas, through gas solid separation after, after respectively obtaining dust and 90 ~ 110 DEG C of dedustings
Dry tail gas；The dust is again returned in the fluidized bed dryer by cloth bag blocking valve；
(3) the major part for drying tail gas after 90 ~ 110 DEG C of dedustings is then entered into by one cycle blower fan and once changed
In hot device, and indirect heat exchange is carried out with low, middle pressure steam, respectively obtain 120 DEG C and dry tail gas and steam；Described 120 DEG C
Dry tail gas and enter into the fluidized bed dryer and use as drying carrier gas；After the condensed B to saturation lime set of the steam
Discharge；The pressure balanced branch line of maintenance is provided with pipeline after the one cycle blower fan, a small amount of tail gas that dries enters
Row empties to maintain the pressure balance of system；
(4) the another part dried in tail gas after 90 ~ 110 DEG C of dedustings is then by air-introduced machine by the scrubbing tower
Bottom enters, and carries out indirect counterflow washing with the water from first group of 50 ~ 70 DEG C of heating tube in the fluidized bed dryer, changes
Heat, respectively obtains 80 ~ 90 DEG C of water after washing and 50 ~ 70 DEG C after washing dry tail gas；
50 ~ 70 DEG C after the washing dry tail gas entered into through secondary cycle blower fan by the top of the scrubbing tower it is secondary
In heat exchanger, here, dry tail gas is heated to 120 DEG C by low, middle pressure steam, work in the fluidized bed dryer is then gone through
Used for carrier gas is circulated；
80 ~ 90 DEG C of water after the washing converge to the bottom of towe of the scrubbing tower, and a part of water is entered into by lime set pump
In first group of heating tube in the fluidized bed dryer, used as a part of thermal source of drying system, another part water leads to
Cross the lime set pump and enter into follow-up system and used as recovery.
The present invention has advantages below compared with prior art：
1st, fluidized bed dryer is a static equipment in the present invention, reduces the air capacity of the system of leaking into, and improves system
Security；Simultaneously because the present invention is employed nitrogen as to dry carrier gas, and sealing and circulating is carried out, therefore, the oxygen content in system
Significantly decline, further increase the security of system.
2nd, the tail gas part that dries of 90 ~ 110 DEG C directly carries out reuse, another part warp as carrier gas is dried in the present invention
Washings are heated to 80 ~ 90 DEG C after washing, and this hot water is used for the preheating of raw coal, in washing process, raw coal evaporation
Moisture is recovered utilization, therefore, technique of the present invention can either will dry heat in tail gas adequately and reasonably
Utilize, the moisture that can be evaporated raw coal again is recycled.
3rd, the discharge capacity for drying tail gas of the invention seldom, greatly reduces the pollution to environment.
Brief description of the drawings
Specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is artwork of the invention.
In figure：1-run coal bin, 2-raw coal blocking valve 3-fluidized bed dryer, 4-product coal 5-cloth bag of blocking valve
6-one cycle of deduster blower fan, 7-heat exchanger 8-air-introduced machine, 9-scrubbing tower, 10-lime set pump 11-secondary
Circulating fan 12-secondary heat exchanger, 13-cloth bag blocking valve.
Specific embodiment
As shown in figure 1, a kind of fluidized bed coal is dried and water recovery method, comprise the following steps：
(1) the raw coal from up-stream system is first into being cached in run coal bin 1, and raw coal blocking valve 2 is then passed through again
Set in entering into three groups of fluidized bed dryers of heating tube 3, raw coal enters with 80 ~ 90 DEG C of hot water in first group of heating tube first
Row indirect heat exchange, by after first group of heating tube heating, hot water temperature enters into scrubbing tower 9 after being reduced to 50 ~ 70 DEG C, and coal
Powder temperature reaches 60 ~ 80 DEG C, then carries out indirect heat exchange with low, the middle pressure steam in second group, the 3rd group of heating tube respectively, point
80 DEG C of coal dust after not dried, saturation lime set A, 90 ~ 110 DEG C containing dust and vapor dry tail gas；80 after drying
DEG C coal dust discharged by product coal blocking valve 4, obtain product coal；And saturation lime set then discharge system；
(2) 90 ~ 110 DEG C containing dust and vapor dry tail gas and enter into sack cleaner 5, while low-pressure nitrogen
Entered into sack cleaner 5 as purge gas, through gas solid separation after, respectively obtain dry after dust and 90 ~ 110 DEG C of dedustings
Dry tail gas；Dust is again returned in fluidized bed dryer 3 by cloth bag blocking valve 13；
(3) the major part for drying tail gas after 90 ~ 110 DEG C of dedustings then enters into a heat exchanger by one cycle blower fan 6
In 7, and indirect heat exchange is carried out with low, middle pressure steam, respectively obtain 120 DEG C and dry tail gas and steam；120 DEG C dry tail gas
Enter into fluidized bed dryer 3 and use as drying carrier gas；Discharged after the condensed B to saturation lime set of steam；One cycle wind
The pressure balanced branch line of maintenance is provided with pipeline after machine 6, a small amount of tail gas that dries is emptied to maintain system
Pressure balance；
(4) the another part dried in tail gas after 90 ~ 110 DEG C of dedustings is then entered by air-introduced machine 8 by the bottom of scrubbing tower 9
Enter, and indirect counterflow washing, heat exchange are carried out with the water from first group of 50 ~ 70 DEG C of heating tube in fluidized bed dryer 3, respectively
50 ~ 70 DEG C after 80 ~ 90 DEG C of water and washing after to washing dry tail gas；
50 ~ 70 DEG C after washing dry tail gas and enter into secondary heat exchange through secondary cycle blower fan 11 by the top of scrubbing tower 9
In device 12, here, dry tail gas is heated to 120 DEG C by low, middle pressure steam, conduct is carried in then going through fluidized bed dryer 3
Gas is circulated and uses；
80 ~ 90 DEG C of water after washing converge to the bottom of towe of scrubbing tower 9, and a part of water enters into fluid bed by lime set pump 10
In first group of heating tube in drier 3, used as a part of thermal source of drying system, another part water is entered by lime set pump 10
Used as recovery to follow-up system.
Claims (1)
1. a kind of fluidized bed coal is dried and water recovery method, is comprised the following steps：
(1) the raw coal from up-stream system is first into run coal bin（1）In cached, then again pass through raw coal blocking valve（2）
Three groups of fluidized bed dryers of heating tube are set in entering into（3）In, raw coal first with first group of heating tube in 80 ~ 90 DEG C of hot water
Indirect heat exchange is carried out, by after first group of heating tube heating, hot water temperature enters into scrubbing tower after being reduced to 50 ~ 70 DEG C
（9）In, and coal dust temperature reaches 60 ~ 80 DEG C, is then carried out with low, the middle pressure steam in second group, the 3rd group of heating tube successively
Indirect heat exchange, respectively obtain dry after 80 DEG C coal dust, saturation lime set A, 90 ~ 110 DEG C containing dust and vapor dry tail
Gas；80 DEG C of coal dust passes through product coal blocking valve after the drying（4）Discharge, obtains product coal；And saturation lime set is then discharged and is
System；
(2) described 90 ~ 110 DEG C containing dust and vapor dry tail gas and enter into sack cleaner（5）In, while low pressure nitrogen
Gas enters into sack cleaner as purge gas（5）In, through gas solid separation after, after respectively obtaining dust and 90 ~ 110 DEG C of dedustings
Dry tail gas；The dust passes through cloth bag blocking valve（13）Again return to the fluidized bed dryer（3）In；
(3) the major part for drying tail gas after 90 ~ 110 DEG C of dedustings is then by one cycle blower fan（6）Enter into and once exchange heat
Device（7）In, and indirect heat exchange is carried out with low, middle pressure steam, respectively obtain 120 DEG C and dry tail gas and steam；Described 120 DEG C
Dry tail gas and enter into the fluidized bed dryer（3）Interior conduct dries carrier gas and uses；The steam is condensed to saturation lime set B
After discharge；The one cycle blower fan（6）The pressure balanced branch line of maintenance is provided with pipeline afterwards, a small amount of dries tail
Gas is emptied to maintain the pressure balance of system；
(4) the another part dried in tail gas after 90 ~ 110 DEG C of dedustings then passes through air-introduced machine（8）By the scrubbing tower（9）
Bottom enter, and with from the fluidized bed dryer（3）In the water of first group of 50 ~ 70 DEG C of heating tube carry out indirect counterflow and wash
Wash, exchange heat, respectively obtain 80 ~ 90 DEG C of water after washing and 50 ~ 70 DEG C after washing dry tail gas；
50 ~ 70 DEG C after the washing dry tail gas by the scrubbing tower（9）Top through secondary cycle blower fan（11）Enter into
Secondary heat exchanger（12）In, here, dry tail gas is heated to 120 DEG C by low, middle pressure steam, then goes through the fluid bed and do
Dry device（3）Middle being circulated as carrier gas uses；
80 ~ 90 DEG C of water after the washing converge to the scrubbing tower（9）Bottom of towe, a part of water pass through lime set pump（10）Into
To the fluidized bed dryer（3）In first group of heating tube in, as a part of thermal source of drying system, another part
Water is by the lime set pump（10）Follow-up system is entered into be used as recovery.
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| CN201510687811.8A CN105222528B (en) | 2015-10-23 | 2015-10-23 | A kind of fluidized bed coal is dried and water recovery method |
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| CN105222528B true CN105222528B (en) | 2017-06-06 |
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| CN110701872A (en) * | 2019-09-20 | 2020-01-17 | 天津科技大学 | Salt drying tail gas waste heat recovery system |
| CN115212671B (en) * | 2022-06-29 | 2023-07-04 | 成都易态科技有限公司 | Ash discharging method, ash discharging system and yellow phosphorus flue gas purifying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4029525A1 (en) * | 1990-09-18 | 1992-03-19 | Umwelt & Energietech | METHOD AND DEVICE FOR DRYING SOLID MATERIALS IN AN INDIRECTLY HEATED FLUIDIZED BED |
| DE19612186A1 (en) * | 1996-03-27 | 1997-10-02 | Steinmueller Gmbh L & C | Method of drying crude lignite, with fluidised bed dryer |
| CN101581532B (en) * | 2009-06-04 | 2010-11-10 | 山东天力干燥设备有限公司 | Multi-effect system and process for pre-drying lignite through overheated steam |
| CN102626965B (en) * | 2012-04-23 | 2014-03-12 | 中国天辰工程有限公司 | ABS powder drying method |
| CN102690035B (en) * | 2012-06-13 | 2014-03-12 | 山东天力干燥股份有限公司 | System and process for drying sludge using pulse combustion internal heating fluid bed |
| CN103234214B (en) * | 2013-05-15 | 2015-10-28 | 天华化工机械及自动化研究设计院有限公司 | The fine coal coal gasification powder process of high-moisture coal and Water Sproading integrated system and method thereof |
| JP6364753B2 (en) * | 2013-11-22 | 2018-08-01 | 株式会社Ihi | Hydrous solids drying equipment |
| CN103575068B (en) * | 2013-11-30 | 2015-03-25 | 河北联合大学 | Lignite drying water recycling and drying tail gas recycling system |
| CN104848655B (en) * | 2015-06-02 | 2017-03-01 | 天华化工机械及自动化研究设计院有限公司 | One kind is used for ultra-high molecular weight polyethylene nitrogen sealing and circulating fluidized bed drying method |
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