CN104567335A - System and technological method for drying coal slime by high-temperature flue gas of power station - Google Patents
System and technological method for drying coal slime by high-temperature flue gas of power station Download PDFInfo
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- CN104567335A CN104567335A CN201510039222.9A CN201510039222A CN104567335A CN 104567335 A CN104567335 A CN 104567335A CN 201510039222 A CN201510039222 A CN 201510039222A CN 104567335 A CN104567335 A CN 104567335A
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Abstract
The invention discloses a system and a technological method for drying coal slime by high-temperature flue gas of a power station and belongs to the technical field of energy conservation and environmental protection. The system for drying the coal slime by the high-temperature flue gas of the power station comprises feeding equipment (1), a dryer (2), a primary dust remover (3), finished product conveying equipment (4), a fan (5), a power plant dust remover (6), a power plant boiler (7) and a presedimentation chamber (8). The system and the technological method overcome the defects of system complexity, low efficiency, high coal consumption, diseconomy in operation and incapability of meeting environmental protection standards of existing coal slime drying methods.
Description
Technical field
The present invention relates to a kind of system and the process that utilize power plant's high temperature flue gas drying coal slime, belong to energy-conserving and environment-protective technical field.
Background technology
Coal slime is the semi-solid thing of the moisture formation of coal dust, it is a kind of byproduct in coal production process, generally still have the calorific value of 10 ~ 20MJ/kg, even exceeding some low heat value thermal coals, is a kind of coal resources of preciousness, but the unfavorable conditions such as coal slime has again that high retentiveness is strong, high-moisture and high viscosity, stack, store and transport all more difficult, be difficult to realize commercial Application, result not only wastes valuable coal resources, and causes serious environmental pollution.
Coal is that China uses maximum energy, expects 2015, and national coal slime output will reach 2.4 hundred million tons, along with the progress of technology, under the encouragement of national related industry policy, in recent years boiler of power plant mix burn coal slime generate electricity, become coal slime utilize Perfected process.
Boiler is entered by being mixed into power plant soot after coal slime drying, it is one of main technique methods of current Boiler Mixed Burning coal slime, conventional coal slime drying system as shown in Figure 1,600 DEG C ~ 800 DEG C high-temperature hot flue gases adopting hot-blast stove to produce directly heat coal slime, moisture evaporation in coal slime is discharged, thus realizes the drying process to coal slime.System chief component has: the elementary deduster 3 of the useless flue gas of process of being responsible for the drying machine 2 of dry coal slime, carrying the feeding device 1 of coal slime to drying machine 2, be responsible for and dust arrester 6a, process dust arrester 6a discharge mortar wastewater treatment equipment 11, finished product conveying equipment 4, blower fan 5, the hot-blast stove 7a of high-temperature hot flue gas is provided for drying machine 2, be the solid-state castoff treating apparatus 10, chimney 12 etc. that hot-blast stove 7a supplies coal-fired defeated device for coal 9, process hot-blast stove 7a discharges slag.
Limit by construction cost, system cannot arrange desulfurization and out of stock device, pollutant emission severe overweight; Process dust-laden gives up the dust arrester of flue gas, cannot meet dust emission standard; Solid waste treatment device and wastewater treatment can not meet environmental protection standard equally; The efficiency of combustion of hot-blast stove is low simultaneously.
Therefore, conventional coal slime drying system exist system complex, hot-blast stove efficiency low and coal consumption is high, runs extremely uneconomical, pollutant, dust, solid-state castoff, waste water etc. discharge cannot meet the shortcomings such as environmental protection standard.
Summary of the invention
In order to overcome existing coal slime drying means exist system complex, efficiency is low, coal consumption is high, run uneconomical, cannot the defects such as environmental protection standard be met, the present invention proposes a kind of system and the process that utilize power plant's high temperature flue gas drying coal slime.
The present invention adopts following technical scheme: a kind of system utilizing power plant's high temperature flue gas drying coal slime, it is characterized in that, comprise feeding device, drying machine, elementary deduster, finished product conveying equipment, blower fan, plant dust catcher, boiler of power plant, pre-expansion chamber, the delivery outlet of described feeding device is connected with the input port of described drying machine, one end of the delivery outlet of described drying machine is connected with the input port of described elementary deduster, the other end of the delivery outlet of described drying machine is connected with described finished product conveying equipment, one end of described elementary deduster delivery outlet is connected with described finished product conveying equipment, the other end of described elementary deduster delivery outlet is connected with described blower fan, described blower fan delivery outlet respectively with the input port of described plant dust catcher, described boiler of power plant is connected, one end of the delivery outlet of described boiler of power plant is connected with the input port of described plant dust catcher, the other end of the delivery outlet of described boiler of power plant is connected with the input port of described pre-expansion chamber, the delivery outlet of described pre-expansion chamber is connected with the input port of described drying machine.
Technical scheme of the present invention also provides a kind of process utilizing power plant's high temperature flue gas drying coal slime, it is characterized in that, comprises the steps:
(1) high-temperature flue gas of boiler of power plant, under the effect of blower fan, first passes through pre-expansion chamber, and separated by swarming ash in the middle part of high-temperature flue gas, the high-temperature flue gas after dedusting enters drying machine;
(2) wet coal slime is delivered into drying machine by feeding device, and wet coal slime directly contacts with the high-temperature flue gas from boiler of power plant in drying machine carries out mass heat transfer;
(3) after coal slime and flue gas complete mass heat transfer substantially, wet coal slime becomes the coal slime product after mummification, and the coal slime after mummification is discharged from the delivery outlet of drying machine and entered finished product conveying equipment, and mummification coal slime transports by finished product conveying equipment;
(4) after coal slime and flue gas complete mass heat transfer substantially, flue gas becomes useless flue gas and discharges in drying machine, useless flue gas is after elementary deduster rough dusting, plant dust catcher entrance is entered by blower fan, after the stove of remittance boiler of power plant after flue gas, enter plant dust catcher and follow-up power plant process flow process thereof;
(5) coal dust of elementary deduster collection, enter finished product conveying equipment, coal dust together transports with mummification coal slime by finished product conveying equipment.
The beneficial effect that the present invention reaches: the efficiency of combustion of (1) boiler of power plant is far above hot-blast stove; (2) directly extract the high-temperature flue gas of 500 ~ 700 DEG C from boiler of power plant as coal slime drying source, coal consumption is low, economize energy; (3) system does not have waste residue, waste water and toxic emission, and environmental protection is good; (4) system architecture hinge structure greatly simplifies, small investment.
Accompanying drawing explanation
Fig. 1 is coal slime drying system schematic diagram of the prior art.
The implication marked in Fig. 1: 1-feeding device, 2-drying machine, the elementary deduster of 3-, 4-finished product conveying equipment, 5-blower fan, 6a-dust arrester, 7a-hot-blast stove, the defeated device for coal of 9-, 10-solid-state castoff treating apparatus, 12-chimney.
Fig. 2 is coal slime drying system structural representation of the present invention.
The implication marked in Fig. 2: 1-feeding device, 2-drying machine, the elementary deduster of 3-, 4-finished product conveying equipment, 5-blower fan, 6-plant dust catcher, 7-boiler of power plant, the pre-expansion chamber of 8-.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1 be coal slime drying system schematic diagram of the prior art, 600 DEG C ~ 800 DEG C high-temperature hot flue gases adopting hot-blast stove to produce directly heat coal slime, the moisture evaporation in coal slime are discharged, thus realize drying process to coal slime.System chief component has: the elementary deduster 3 of the useless flue gas of process of being responsible for the drying machine 2 of dry coal slime, carrying the feeding device 1 of coal slime to drying machine 2, be responsible for and dust arrester 6a, process dust arrester 6a discharge mortar wastewater treatment equipment 11, finished product conveying equipment 4, blower fan 5, the hot-blast stove 7a of high-temperature hot flue gas is provided for drying machine 2, be solid-state castoff treating apparatus 10, the chimney 12 that hot-blast stove 7a supplies coal-fired defeated device for coal 9, process hot-blast stove 7a discharges slag.
Compared to Figure 1, the present invention directly extracts the high-temperature flue gas of 500 ~ 700 DEG C as coal slime drying source from boiler of power plant, be supplied to drying machine 2, cancels in Fig. 1: hot-blast stove 7a, defeated device for coal 9, solid-state castoff treating apparatus 10; Dried useless flue gas is entered plant dust catcher together to process with the useless flue gas of power plant, cancel in Fig. 1: dust arrester 6a, wastewater treatment equipment 11, chimney 12.
As shown in Figure 2 be coal slime drying system structural representation of the present invention, the present invention proposes a kind of system utilizing power plant's high temperature flue gas drying coal slime, comprise feeding device 1, drying machine 2, elementary deduster 3, finished product conveying equipment 4, blower fan 5, plant dust catcher 6, boiler of power plant 7, pre-expansion chamber 8, the delivery outlet of described feeding device 1 is connected with the input port of described drying machine 2, one end of the delivery outlet of described drying machine 2 is connected with the input port of described elementary deduster 3, the other end of the delivery outlet of described drying machine 2 is connected with described finished product conveying equipment 4, one end of described elementary deduster 3 delivery outlet is connected with described finished product conveying equipment 4, the other end of described elementary deduster 3 delivery outlet is connected with described blower fan 5, described blower fan 5 delivery outlet respectively with the input port of described plant dust catcher 6, described boiler of power plant 7 is connected, one end of the delivery outlet of described boiler of power plant 7 is connected with the input port of described plant dust catcher 6, the other end of the delivery outlet of described boiler of power plant 7 is connected with the input port of described pre-expansion chamber 8, the delivery outlet of described pre-expansion chamber 8 is connected with the input port of described drying machine 2.
Technical scheme of the present invention also provides a kind of process utilizing power plant's high temperature flue gas drying coal slime, it is characterized in that, comprises the steps:
(1) high-temperature flue gas of boiler of power plant 7, under the effect of blower fan 5, first pass through pre-expansion chamber 8, separated by swarming ash in the middle part of high-temperature flue gas, the high-temperature flue gas after dedusting enters drying machine 2;
(2) wet coal slime is delivered into drying machine 2 by feeding device 1, and wet coal slime directly contacts with the high-temperature flue gas from boiler of power plant 7 in drying machine 2 carries out mass heat transfer;
(3) after coal slime and flue gas complete mass heat transfer substantially, wet coal slime becomes the coal slime product after mummification, and the coal slime after mummification is discharged from the delivery outlet of drying machine 2 and entered finished product conveying equipment 4, and mummification coal slime transports by finished product conveying equipment 4;
(4) after coal slime and flue gas complete mass heat transfer substantially, flue gas becomes useless flue gas and discharges in drying machine 2, useless flue gas is after elementary deduster 3 rough dusting, plant dust catcher 6 entrance is entered by blower fan 5, after the stove of remittance boiler of power plant 7 after flue gas, enter plant dust catcher 6 and follow-up power plant process flow process thereof;
(5) coal dust of elementary deduster 3 collection, enter finished product conveying equipment 4, coal dust together transports with mummification coal slime by finished product conveying equipment 4.
Operation principle of the present invention: wet coal slime is delivered into drying machine 2 by feeding device 1, wet coal slime directly contacts with the high-temperature flue gas from boiler of power plant 7 in drying machine 2, under the effect of high-temperature flue gas, the stickiness of water reduces, penetrating power strengthens, the outside diffusion velocity of moisture of coal slime inside increases, wet coal slime and high-temperature flue gas constantly carry out mass heat transfer, moisture is constantly evaporated, along with the development of dry process, the water content of coal slime reduces gradually, after coal slime and flue gas complete mass heat transfer substantially, wet coal slime becomes product after mummification, coal slime after mummification is discharged from the afterbody of drying machine 2 and is entered finished product conveying equipment 4, mummification coal slime transports by finished product conveying equipment 4, the high-temperature flue gas of boiler of power plant 7, under the effect of blower fan 5, first pass through pre-expansion chamber 8, swarming ash in the middle part of high-temperature flue gas is separated, high-temperature flue gas after dedusting enters drying machine 2, high-temperature flue gas constantly carries out mass heat transfer with wet coal slime in drying machine 2, along with the development of dry process, flue-gas temperature reduces gradually, after coal slime and flue gas complete mass heat transfer substantially, flue gas becomes useless flue gas and discharges in drying machine 2, useless flue gas is after elementary deduster 3 rough dusting, plant dust catcher 6 entrance is entered by blower fan 5, after the stove of remittance boiler of power plant 7 after flue gas, enter plant dust catcher 6 and follow-up power plant process flow process thereof, the coal dust that elementary deduster 3 is collected, enter finished product conveying equipment 4, coal dust together transports with mummification coal slime by finished product conveying equipment 4, the flying dust that pre-expansion chamber 8 is collected, the related system being incorporated to power plant together processes.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. one kind utilizes the system of power plant's high temperature flue gas drying coal slime, it is characterized in that, comprise feeding device (1), drying machine (2), elementary deduster (3), finished product conveying equipment (4), blower fan (5), plant dust catcher (6), boiler of power plant (7), pre-expansion chamber (8), the delivery outlet of described feeding device (1) is connected with the input port of described drying machine (2), one end of the delivery outlet of described drying machine (2) is connected with the input port of described elementary deduster (3), the other end of the delivery outlet of described drying machine (2) is connected with described finished product conveying equipment (4), one end of described elementary deduster (3) delivery outlet is connected with described finished product conveying equipment (4), the other end of described elementary deduster (3) delivery outlet is connected with described blower fan (5), described blower fan (5) delivery outlet respectively with the input port of described plant dust catcher (6), described boiler of power plant (7) is connected, one end of the delivery outlet of described boiler of power plant (7) is connected with the input port of described plant dust catcher (6), the other end of the delivery outlet of described boiler of power plant (7) is connected with the input port of described pre-expansion chamber (8), the delivery outlet of described pre-expansion chamber (8) is connected with the input port of described drying machine (2).
2. adopt a kind of process utilizing power plant's high temperature flue gas drying coal slime utilizing the system of power plant's high temperature flue gas drying coal slime according to claim 1, it is characterized in that, comprise the steps:
(1) high-temperature flue gas of boiler of power plant (7), under the effect of blower fan (5), first pass through pre-expansion chamber (8), separated by swarming ash in the middle part of high-temperature flue gas, the high-temperature flue gas after dedusting enters drying machine (2);
(2) wet coal slime is delivered into drying machine (2) by feeding device (1), and wet coal slime directly contacts with the high-temperature flue gas from boiler of power plant (7) in drying machine (2) carries out mass heat transfer;
(3) after coal slime and flue gas complete mass heat transfer substantially, wet coal slime becomes the coal slime product after mummification, and the coal slime after mummification is discharged from the delivery outlet of drying machine (2) and entered finished product conveying equipment (4), and mummification coal slime transports by finished product conveying equipment (4);
(4) after coal slime and flue gas complete mass heat transfer substantially, flue gas becomes useless flue gas and discharges in drying machine (2), useless flue gas is after elementary deduster (3) rough dusting, plant dust catcher (6) entrance is entered by blower fan (5), after the stove of remittance boiler of power plant (7) after flue gas, enter plant dust catcher (6) and follow-up power plant process flow process thereof;
(5) coal dust collected of elementary deduster (3), enter finished product conveying equipment (4), coal dust together transports with mummification coal slime by finished product conveying equipment (4).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170257A (en) * | 2015-08-14 | 2015-12-23 | 中国能源建设集团安徽省电力设计院有限公司 | Coal slime drying and screening crushing device utilizing smoke waste heat of power station boiler |
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| CN102759253A (en) * | 2012-07-12 | 2012-10-31 | 西安交通大学 | Flue gas fluidized bed lignite drying system provided with internal heat source and integrated to heat-engine plant |
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Patent Citations (8)
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| JPH1182991A (en) * | 1997-09-03 | 1999-03-26 | Mitsubishi Heavy Ind Ltd | Method and device for drying and purging coal for power generation |
| KR100927875B1 (en) * | 2007-06-25 | 2009-11-30 | 최태영 | Coal Drying System Using Exhaust Gas as Sealant |
| JP2009202078A (en) * | 2008-02-27 | 2009-09-10 | Taiheiyo Cement Corp | Drying and granulation system of wet organic waste |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105170257A (en) * | 2015-08-14 | 2015-12-23 | 中国能源建设集团安徽省电力设计院有限公司 | Coal slime drying and screening crushing device utilizing smoke waste heat of power station boiler |
| CN105170257B (en) * | 2015-08-14 | 2017-10-24 | 中国能源建设集团安徽省电力设计院有限公司 | A kind of coal slime dry sieve crushing device of utilization boiler of power plant fume afterheat |
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Application publication date: 20150429 |