CN103438687A - Explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system - Google Patents
Explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system Download PDFInfo
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- CN103438687A CN103438687A CN201310345274XA CN201310345274A CN103438687A CN 103438687 A CN103438687 A CN 103438687A CN 201310345274X A CN201310345274X A CN 201310345274XA CN 201310345274 A CN201310345274 A CN 201310345274A CN 103438687 A CN103438687 A CN 103438687A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an industrial material drying system and provides an explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system. The explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system comprises an air blower, a fluidization hot blast heater, a drying machine, a dust collector, a draught fan and a smoke exhausting pipe which are connected in sequence, and is characterized in that the smoke exhausting pipe is connected with an air returning pipe in a forking way, and the other end of the air returning pipe is connected with an air inlet of the air blower; an air distribution pipe is connected with one section, which is close to the air blower, of the air returning pipe in the forking way. According to the explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system, the problems of an existing drying system that the oxygen content of generated high-temperature smoke is too high so that the combustion or explosion dangers of the system are easy to cause are solved; the explosion-proof safe energy-saving and emission-reducing fluidization oxygen-controlling drying system has energy-saving and emission-reducing effects and is widely applied to drying materials in chemical engineering, building materials and metallurgical industries.
Description
Technical field
The present invention relates to the industrial material drying system, especially a kind of anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system.
Background technology
In chemical industry, building materials, metallurgical industry are produced, the drying system of material is a very important ring, and most typical drying system includes air blast, fluidisation hot-blast stove, dryer, dust-precipitator, air-introduced machine, the smoke exhaust pipe connected successively.The problem that existing drying system exists is: because its excessive wind causes its high-temperature flue gas oxygen content high, if the material of being dried is combustibles, and as coal, chemical fertilizer etc., the danger of the burning of easily generation system or blast.Now with coke, dry output 32t/h, first water 5%, the drying system of whole water 1% is that example is illustrated, its fluidisation hot-blast stove heat capacity is 2*10
6kcal/h:
Q=R/(t*λ) Ⅰ
Q: fluidized bed furnace outlet high-temperature flue gas tolerance
T: high-temperature flue-gas
λ: flue gas specific heat capacity
In the I formula, R=2*10
6kcal/h, t=850 ℃, λ=0.365kcal/ (Nm
3* ℃),
Q=2*10
6/(850*0.365)=6446Nm
3/h
And need to produce 2*10
6the heat of Kcal/h, take calorific value as 5000kcal/Kg, and the industrial coal of sulfur-bearing 2% calculates, and needs industrial coal 400kg/h.Fugitive constituent in industrial coal is about 20%, and its content is with CH
4be main, other 80% by solid carbon and other ash compositions.Calculate the oxygen demand process of 400KG industry coal:
CH
4+2O
2=CO
2+2H
2O Ⅱ
C+O
2=CO
2 Ⅲ
Obtained 80KG methane (CH by the II formula
4) amount of oxygen that consumes of completing combustion is 320KG; CH
4calorific value be about 12009kcal/Kg, 80KG CH
4the heat that completing combustion produces is about:
R
wave=80*12009=960720Kcal
The heat discharged by solid C burning:
R
c=2000000-960720=1039280kcal, Gu the calorific value of C is 7838kcal/Kg,
The content of C is: 1039280/7838=133Kg.
By the III formula, obtained,
Total oxygen consumption mass M
consumption=355+320=675KG, its oxygen density is 1.429KG/Nm
3,
Its total oxygen demand volume Q
consumption=472Nm
3
According in the I formula, the high-temperature flue gas amount is Q=6446Nm
3, the oxygen content that by air blast, enters burner hearth is: 6446*0.21=1354Nm
3
According to II, III Shi Ke get, after completing combustion, the surplus of the oxygen content of its high-temperature flue gas:
Q
surplus=1354-472=882Nm
3.
The oxygen content in the high-temperature flue gas of fluidisation hot-blast stove exit:
η
stove=882/6446=13.7%.
After entering drying system, the high-temperature flue gas of oxygen content 13.7% leaked out, bagroom back-blowing and unburnt impact, and the oxygen content of actual measurement flue gas is between 15% ~ 17%, and high energy reaches 19%.This high oxygen gas very easily causes the scaling loss of bagroom in system, and burning and the blast of material in system, and in reality, such accident often occurs, and to the user, has brought great inconvenience and security incident, causes huge potential danger.
Summary of the invention
Purpose of the present invention is exactly to solve the problem that existing drying system easily produces system internal combustion or explosion danger, and a kind of anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system is provided.
Mentality of designing of the present invention: the tail gas that system is produced and air carry out a certain amount of proportioning and return to the fluidisation hot-blast stove and burn away, and not affecting under the prerequisite that main stove burns, the whole system oxygen content are controlled in the safety in production scope.
Concrete scheme of the present invention is: for existing drying system, improved, it includes air blast, fluidisation hot-blast stove, dryer, dust-precipitator, air-introduced machine, the smoke exhaust pipe connected successively, it is characterized in that: on smoke exhaust pipe, fork-join one returns airduct, the other end that returns airduct connects the air inlet of air blast, and near air blast section fork-join, the air aid distributing pipe is arranged returning airduct.
Be positioned on smoke exhaust pipe in the present invention and return airduct joint outer end and be provided with exhaust smoke valve.
In the air inlet junction of returning airduct and air blast, the circulation control valve is installed in the present invention.
The air distribution control valve is installed in the present invention on the air aid distributing pipe.
Operation mechanism of the present invention: utilize air-introduced machine 5 that the tail gas of a part of elevated oxygen level is controlled from chimney and discharged by exhaust smoke valve 7 by smoke discharging pipe, another part tail gas is back to air blast 1 via returning airduct 8, then by the tail gas drum influent stream heat-transmission wind furnace 2 returned.Because the oxygen content of tail gas is low than natural air, tail gas will be lower through fluidisation Combustion of Hot Air Furnace oxygen content, if but use tail gas to enter fluidisation hot-blast stove support burning always, must cause the tail gas oxygen content constantly to descend, finally affect the normal combustion of fluidisation hot-blast stove.Therefore also added air aid distributing pipe 4 in the present invention, its effect is during normal combustion, to allocate a certain proportion of air into and make fluidisation hot-blast stove normal combustion in the tail gas oxygen content of returning is not enough to supporting stream heat-transmission wind furnace stove.The ratio of air and tail gas is controlled by air distribution control valve 10.Total tolerance that the fluidisation hot-blast stove needs is regulated by circulation control valve 11 or by blower variable frequency, for air can be entered smoothly, returns airduct 8, and whole air channel planted agent keeps zero-pressure or micro-negative pressure.
The present invention designs ingenious, simple in structure, and improving cost is low, and control oxygen is effective, safe and reliable, has greatly improved the operational safety performance of system.The present invention returns to the oxygen content of drying system to the fluidisation hot-blast stove for again burning to reach the oxygen content that reduces whole system lower than the tail gas of AIR Proportional, thereby reduces flammable materials generation systems internal combustion, the possibility of blast.Thereby and the tail gas returned also can reclaim the purpose that a part of heat reaches energy-saving and emission-reduction.
The accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention;
Fig. 2 returns airduct and air blast junction structural representation.
In figure: 1-air blast, 2-fluidisation hot-blast stove, 3-dryer, 4-dust-precipitator, 5-air-introduced machine, 6-smoke exhaust pipe, 7-exhaust smoke valve, 8-return airduct, 9-air aid distributing pipe, 10-air distribution control valve, 11-circulation control valve, 12-blower inlet.
The specific embodiment
Referring to Fig. 1,2, the present invention includes the air blast 1, fluidisation hot-blast stove 2, dryer 3, dust-precipitator 4, air-introduced machine 5, the smoke exhaust pipe 6 that connect successively, particularly: on smoke exhaust pipe 6, fork-join one returns airduct 8, the other end that returns airduct 8 connects the air inlet 12 of air blast 1, and near 1 section fork-join of air blast, air aid distributing pipe 9 is arranged returning airduct 8.
Be positioned on smoke exhaust pipe 6 in the present embodiment and return airduct 8 joint outer ends and be provided with exhaust smoke valve 7.
In the air inlet junction of returning airduct 8 and air blast 1, circulation control valve 11 is installed in the present embodiment.
Air distribution control valve 10 is installed in the present embodiment on air aid distributing pipe 9.Form the preferred forms of invention.
Claims (5)
1. anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system, include the air blast, fluidisation hot-blast stove, dryer, dust-precipitator, air-introduced machine, the smoke exhaust pipe that connect successively, it is characterized in that: on smoke exhaust pipe, fork-join one returns airduct, the other end that returns airduct connects the air inlet of air blast, and near air blast section fork-join, the air aid distributing pipe is arranged returning airduct.
2. anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system according to claim 1 is characterized in that: be positioned on smoke exhaust pipe and return airduct joint outer end and be provided with exhaust smoke valve.
3. anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system according to claim 1 and 2, is characterized in that: in the air inlet junction of returning airduct and air blast, the circulation control valve is installed.
4. anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system according to claim 1 and 2, is characterized in that: the air distribution control valve is installed on the air aid distributing pipe.
5. anti-explosion safety energy-saving and emission-reduction fluidisation control oxygen drying system according to claim 3, is characterized in that: the air distribution control valve is installed on the air aid distributing pipe.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244715A (en) * | 2012-02-02 | 2014-12-24 | 陶氏益农公司 | Pesticidal compositions and processes related thereto |
| CN105180665A (en) * | 2015-07-30 | 2015-12-23 | 北新集团建材股份有限公司 | Method and system for using waste heat of ebullition furnace |
| CN105889908A (en) * | 2016-06-06 | 2016-08-24 | 湖北金炉节能股份有限公司 | Oxygen control fluidized combustion furnace |
| CN110108101A (en) * | 2018-02-01 | 2019-08-09 | 寿光市鲁丽木业股份有限公司 | A kind of wet particle drying system and its drying process |
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|---|---|---|---|---|
| US5087269A (en) * | 1989-04-03 | 1992-02-11 | Western Research Institute | Inclined fluidized bed system for drying fine coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| CN101837316A (en) * | 2009-03-21 | 2010-09-22 | 黄石市建材节能设备总厂 | Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof |
| CN102261822A (en) * | 2011-05-19 | 2011-11-30 | 湖南科达粉体工程有限公司 | Device for drying lignite by microwave fluidization |
| CN103234340A (en) * | 2013-04-19 | 2013-08-07 | 湖南中烟工业有限责任公司 | Control method and device of tobacco pneumatic drying air-heating furnace |
-
2013
- 2013-08-09 CN CN201310345274XA patent/CN103438687A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5087269A (en) * | 1989-04-03 | 1992-02-11 | Western Research Institute | Inclined fluidized bed system for drying fine coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| CN101837316A (en) * | 2009-03-21 | 2010-09-22 | 黄石市建材节能设备总厂 | Vertical drying grind ring flow production energy saving and emission reduction process and air distribution equipment thereof |
| CN102261822A (en) * | 2011-05-19 | 2011-11-30 | 湖南科达粉体工程有限公司 | Device for drying lignite by microwave fluidization |
| CN103234340A (en) * | 2013-04-19 | 2013-08-07 | 湖南中烟工业有限责任公司 | Control method and device of tobacco pneumatic drying air-heating furnace |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244715A (en) * | 2012-02-02 | 2014-12-24 | 陶氏益农公司 | Pesticidal compositions and processes related thereto |
| CN105180665A (en) * | 2015-07-30 | 2015-12-23 | 北新集团建材股份有限公司 | Method and system for using waste heat of ebullition furnace |
| CN105889908A (en) * | 2016-06-06 | 2016-08-24 | 湖北金炉节能股份有限公司 | Oxygen control fluidized combustion furnace |
| CN110108101A (en) * | 2018-02-01 | 2019-08-09 | 寿光市鲁丽木业股份有限公司 | A kind of wet particle drying system and its drying process |
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Application publication date: 20131211 |