CN101928796A - High wind temperature energy saving and emission reduction combined preheating method for blast furnace - Google Patents
High wind temperature energy saving and emission reduction combined preheating method for blast furnace Download PDFInfo
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- CN101928796A CN101928796A CN 201010243599 CN201010243599A CN101928796A CN 101928796 A CN101928796 A CN 101928796A CN 201010243599 CN201010243599 CN 201010243599 CN 201010243599 A CN201010243599 A CN 201010243599A CN 101928796 A CN101928796 A CN 101928796A
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Abstract
The invention relates to a high wind temperature energy saving and emission reduction combined preheating method for a blast furnace, and belongs to the technical field of energy saving and emission reduction and steel smelting equipment. The method comprises the steps of: mixing hot smoke from a hot blast furnace and a front combustion furnace; then exchanging the heat of the mixed smoke with that of cold air and cold gas respectively; supplying the hot air and the hot gas formed after the heat exchange to the hot blast furnace; meanwhile, supplying the hot gas and air which is from a blower of a front furnace to a burner. By the preheating method, a secondary air turbolator heat exchanger is not needed, and control valves and connection pipelines which are used in the method are greatly reduced, so that installation is facilitated, cost is reduced, the probability of reducing leakage is facilitated and maintenance is convenient.
Description
Technical field
The invention belongs to energy-saving and emission-reduction and steel smelting equipment technical field, the combination preheating technology method that particularly a kind of iron-smelting blast furnace hotblast stove uses.
Background technology
In the existing Iron and Steel Production equipment, a kind of " the high wind-warm syndrome combination of blast furnace heat-exchange system " (patent No.: ZL200420024014.9), mainly be made of hotblast stove, preposition roasting kiln, the sub-interchanger of air disturbance, coal gas hot tube heat exchanger, air hot tube heat exchanger, smoke evacuation induced draft fan, precell gas blower, cooled coal gas house steward, freezing air house steward and due pipeline and valve etc. is arranged.When work, adopt a plurality of hotblast stoves to provide hot blast to blast furnace in turn.Under equal prerequisite, the hotblast stove dome temperature is high more, and the hot blast temperature that hotblast stove is sent is just high more, and by the bottom house regulating measure, is easy to keep higher relatively more stable wind pushing temperature.Its technical scheme is: cooled coal gas and combustion-supporting freezing air that hot blast stove burning is used carry out a preheating by corresponding hot tube heat exchanger before entering hotblast stove, and the air after the preheating carries out the secondary preheating through the turbolator interchanger again, the hotblast stove dome temperature correspondingly is improved, thereby the wind pushing temperature that enters blast furnace is improved.This technical scheme has obtained unusual effect, can make the high wind-warm syndrome of blast furnace acquisition more than 1250 ℃, and obtain remarkable economic efficiency.But this technical scheme still has following deficiency:
(1) in the system owing to be provided with the turbolator interchanger of air secondary preheating, make gross weight of equipment still dislike bigger than normal;
(2) air side, fume side resistance to flow are bigger;
(3) valve quantity is on the high side in the system;
(4) the turbolator interchanger is vertical layout, and heat transfer tube is arranged horizontally, and the flue-gas temperature control in mixing smoke pipe is improper and when surpassing 650 ℃, the heat transfer tube distortion is burnt out, and gas leak phenomenon takes place.
Summary of the invention
The combination pre-heating mean that the purpose of this invention is to provide a kind of novel high wind-warm syndrome makes blast furnace under the high wind-warm syndrome prerequisite that obtains more than 1250 ℃, energy-saving and emission-reduction, reduces equipment volume, and metal consumption is few, make and working cost low.
Technical scheme of the present invention is: carry out a heat exchange with freezing air and cooled coal gas respectively after the hot flue gas that will come from hotblast stove and preposition roasting kiln mixes, the warm air, the heating gas that form after the heat exchange are supplied with hotblast stove, simultaneously, also with described heating gas with from the air supplied burner of precell gas blower.
Major function of the present invention is as follows:
1, the technical characterstic that has kept " the combination heat-exchange system of the high wind-warm syndrome of blast furnace " (patent No. is ZL200420024014.9), be that coal gas and air after the preheating is sent to Combustion of Hot Air Furnace, can make the blast temperature of blast furnace realization more than 1250 ℃, synthesis energy saving 6～7Kgce/t iron.
2, the operation of blast furnace operating mode is restricted by multiple factor, when blast furnace be can not accept high wind-warm syndrome, the present invention is convenient to high wind-warm syndrome heat-exchange system is switched, promptly reduce precell gas consumption amount, reduce the mixed flue gas temperature, reduce combustion air and gas preheating temperature or stop the precell operation, directly utilize hot-blast stove fume that air and coal gas are carried out preheating, be sent to hotblast stove warm air and heating gas house steward then, still can make blast furnace obtain 1100 ℃～1200 ℃ blast temperature.
The technology of the present invention had both kept all functions of prior art, again the preheating method of prior art was innovated, was simplified, and made that system is more advanced, safety, and was specific as follows:
1, the patent No. is that the approach of " the combination heat-exchange system of the high wind-warm syndrome of blast furnace " realization blast furnace wind pushing temperature more than 1250 ℃ of ZL200420024014.9 is by heat tube preheater combustion air, coal gas to be carried out one-level preheating (air, coal gas all are preheated to about 200 ℃), by the turbolator interchanger combustion air is carried out preheating again (be the secondary preheating, air is preheated to more than 400 ℃ by 200 ℃).The present invention has simplified technical process, adopt hot combined heat pipe exchanger of air and the hot combined heat pipe exchanger of coal gas respectively, disposable with combustion air, gas preheating to 250～350 ℃, removed secondary air turbolator interchanger, same realization blast furnace wind pushing temperature more than 1250 ℃, system operation and control are more simple, convenient.
2,, make system's operation safer reliable because interchanger all adopts hot combined heat pipe exchanger of air and the hot combined heat pipe exchanger of coal gas, and the total system cold fluid and hot fluid can not leak mutually.
3, the patent No. is that " the combination heat-exchange system of the high wind-warm syndrome of blast furnace " of ZL200420024014.9 needs combustion air is preheating to more than 400 ℃, air line insulation, valve heatproof and secondary air turbolator interchanger are required with material high, the investment cost height.The present invention is because air, gas preheating temperature about 250～350 ℃, require greatly to reduce with material and to the valve heatproof, and investment cost is low.
4, owing to saved secondary air turbolator interchanger, the present invention not only makes air side, fume side resistance to flow less, can save the operation energy consumption of precell gas blower greatly.
5, owing to saved secondary air turbolator interchanger, system architecture of the present invention is more compact, and floor space, metal consumption, system's resistance are decreased, and investment cost and working cost all have bigger minimizing, and system is more economical, more energy-conservation.
6, owing to saved secondary air turbolator interchanger, by-pass valve control of the present invention and connecting tube reduce in a large number, not only are beneficial to installation, reduce cost, and also are beneficial to reduce to leak probability, maintain easily.
In a word, the present invention has overcome the some shortcomings that prior art exists in actual motion, make system operation more economically, more energy-conservation, can be widely used in the smelting iron and steel industry.
Description of drawings
Fig. 1 is a fundamental diagram of the present invention.
Embodiment
As shown in Figure 1, the air that comes from freezing air house steward 14 is connected the air inlet of air combined heat pipe exchanger 20 through air intlet pipe 12, air cutoff valve 18, warm air house steward 4 is connected through air pipe 22, valve 7 in the air air outlet of air combined heat pipe exchanger 20, is sent to the air inlet end of hotblast stove 1.Connect by trip valve 15 between freezing air house steward 14 and the warm air house steward 4.
Cooled coal gas house steward 13 is connected the gas inlet of coal gas combined heat pipe exchanger 16 through gas stop valve 11, gas pipe 17, and heating gas house stewards 6 are connected through hot gas pipe 15, valve 8 in the coal gas air outlet of coal gas combined heat pipe exchanger 16.Connect by trip valve 10 between cooled coal gas house steward 13 and the heating gas house steward 6.
Heating gas house steward 6 is divided into two-way: the one tunnel directly connects the gas inlet of hotblast stove 1, and the gas inlet end of burner 38 is connected on another road through branch gas tube 2, variable valve 40, gas stop valve 39.The air that precell gas blower 34 is discharged is connected the air inlet end of burner 38 through blast main 35, variable valve 36.The exit end of burner 38 is connected the entrance end of preposition roasting kiln 3, and the upper top connection mixing smoke pipe 5 at preposition roasting kiln 3 is provided with trip valve 30 on mixing smoke pipe 5.
The smoke outlet of hotblast stove 1 connects breadboard 37, and the pipeline of breadboard 37 is divided into two branch roads: the one tunnel through precell convert smoke pipe road 31, valve 33,32 connect preposition roasting kiln 3 on; Also have one the tunnel through smoke regulating valve 29, hot-blast stove fume fairlead 28 and after the flue gas that mixes smoke pipe 5 converges, connect the gas approach end of coal gas combined heat pipe exchanger 16, air combined heat pipe exchanger 20 more respectively respectively through flue gas trip valve 21 and 27, after carrying out heat exchange respectively, the smoke outlet of coal gas combined heat pipe exchanger 16, air combined heat pipe exchanger 20 is connected induced draft fan 25 through smoke exhaust pipe 23 respectively, connects chimney 19 through valve 24 again.
Breadboard 37 connects chimney 19 by main flue gate valve 26.
Claims (1)
1. high wind temperature energy saving and emission reduction combined preheating method for blast furnace, after mixing, the hot flue gas that it is characterized in that coming from hotblast stove and preposition roasting kiln carries out a heat exchange with freezing air and cooled coal gas respectively, the warm air, the heating gas that form after the heat exchange are supplied with hotblast stove, simultaneously, also with described heating gas with from the air supplied burner of precell gas blower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010243599 CN101928796A (en) | 2010-07-29 | 2010-07-29 | High wind temperature energy saving and emission reduction combined preheating method for blast furnace |
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| CN 201010243599 CN101928796A (en) | 2010-07-29 | 2010-07-29 | High wind temperature energy saving and emission reduction combined preheating method for blast furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131813A (en) * | 2011-11-29 | 2013-06-05 | 上海雷林工程技术有限公司 | Coal gas and air asynchronous and double-preheating system with additionally arranged combustion furnace |
| CN103131814A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Coal gas and air synchronous double-preheating system with additionally arranged combustion furnace |
| CN103131812A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Plate-type air and coal gas double-preheating system for hot blast stove |
| CN106399612A (en) * | 2016-11-07 | 2017-02-15 | 上海铁戈炉业有限公司 | Preheating energy saving system and preheating method |
| CN111118245A (en) * | 2020-02-05 | 2020-05-08 | 北京首钢国际工程技术有限公司 | High-temperature preheating system and method for hot blast stove |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3493344A (en) * | 1966-12-21 | 1970-02-03 | John C St Clair | Revolving pebble bed heat exchanger |
| JP2002266012A (en) * | 2001-03-08 | 2002-09-18 | Nippon Steel Corp | Waste heat recovering equipment for hot air stove for blast furnace |
| US20040222574A1 (en) * | 2004-04-05 | 2004-11-11 | Michael Friedrich | Preheating cold blast air of a blast furnace for tempering the hot blast temperature |
| CN200996026Y (en) * | 2006-12-19 | 2007-12-26 | 江苏中天能源设备有限公司 | Combined heat exchange system for realizing high air temperature of hot blast stove |
-
2010
- 2010-07-29 CN CN 201010243599 patent/CN101928796A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3493344A (en) * | 1966-12-21 | 1970-02-03 | John C St Clair | Revolving pebble bed heat exchanger |
| JP2002266012A (en) * | 2001-03-08 | 2002-09-18 | Nippon Steel Corp | Waste heat recovering equipment for hot air stove for blast furnace |
| US20040222574A1 (en) * | 2004-04-05 | 2004-11-11 | Michael Friedrich | Preheating cold blast air of a blast furnace for tempering the hot blast temperature |
| CN200996026Y (en) * | 2006-12-19 | 2007-12-26 | 江苏中天能源设备有限公司 | Combined heat exchange system for realizing high air temperature of hot blast stove |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131813A (en) * | 2011-11-29 | 2013-06-05 | 上海雷林工程技术有限公司 | Coal gas and air asynchronous and double-preheating system with additionally arranged combustion furnace |
| CN103131814A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Coal gas and air synchronous double-preheating system with additionally arranged combustion furnace |
| CN103131812A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Plate-type air and coal gas double-preheating system for hot blast stove |
| CN106399612A (en) * | 2016-11-07 | 2017-02-15 | 上海铁戈炉业有限公司 | Preheating energy saving system and preheating method |
| CN106399612B (en) * | 2016-11-07 | 2019-01-25 | 上海铁戈炉业有限公司 | A kind of preheating energy-saving systems and pre-heating mean |
| CN111118245A (en) * | 2020-02-05 | 2020-05-08 | 北京首钢国际工程技术有限公司 | High-temperature preheating system and method for hot blast stove |
| CN111118245B (en) * | 2020-02-05 | 2023-11-03 | 北京首钢国际工程技术有限公司 | High-temperature preheating system and method for hot blast stove |
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Open date: 20101229 |