CN201785422U - High-air-temperature energy-saving emission-reduction combined preheating system of blast furnace - Google Patents
High-air-temperature energy-saving emission-reduction combined preheating system of blast furnace Download PDFInfo
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- CN201785422U CN201785422U CN2010202793664U CN201020279366U CN201785422U CN 201785422 U CN201785422 U CN 201785422U CN 2010202793664 U CN2010202793664 U CN 2010202793664U CN 201020279366 U CN201020279366 U CN 201020279366U CN 201785422 U CN201785422 U CN 201785422U
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Abstract
A high-air-temperature energy-saving emission-reduction combined preheating system of a blast furnace belongs to the technical field of energy-saving emission-reduction and iron and steel smelting equipment. The preheating system comprises a gas inlet pipe, a cool air inlet pipeline, an air heater, a burner, a front combustion furnace, a front furnace air blower, an air preheating combined heat pipe exchanger, a gas preheating combined heat pipe exchanger, an induced draft fan and a chimney. The preheating system is more economical and energy-saving in running and can be widely applied to the iron and steel smelting industry.
Description
Technical field
The utility model belongs to energy-saving and emission-reduction and steel smelting equipment technical field, the combination pre-heating system 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.
The utility model content
The purpose of this utility model provides a kind of combination pre-heating system 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.
The technical solution of the utility model is: high-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace comprises cooled coal gas intake ducting, freezing air intake ducting, hotblast stove, burner, preposition roasting kiln, precell gas blower, preheating of air combined heat pipe exchanger, gas preheating combined heat pipe exchanger, induced draft fan and chimney; Be characterized in: described freezing air intake ducting is connected the air inlet end of described preheating of air combined heat pipe exchanger, and the air outlet side of described preheating of air combined heat pipe exchanger is at the air inlet end of hotblast stove; Described cooled coal gas intake ducting is connected the gas inlet end of described gas preheating combined heat pipe exchanger, and the coal gas outlet side of described gas preheating combined heat pipe exchanger is connected to the gas inlet end of described hotblast stove and the gas inlet end of described burner; The outlet side of described precell gas blower is connected the air inlet end of described burner; The exit end of described burner is connected the entrance end of described preposition roasting kiln, described being positioned at put the smoke outlet that pushes up on the roasting kiln and is connected to the gas approach end of described preheating of air combined heat pipe exchanger and the gas approach end of gas preheating combined heat pipe exchanger, and the smoke outlet of the smoke outlet of described preheating of air combined heat pipe exchanger and gas preheating combined heat pipe exchanger is connected with chimney by induced draft fan respectively; The smoke outlet of described hotblast stove is connected to the gas approach end of described preheating of air combined heat pipe exchanger and the gas approach end of gas preheating combined heat pipe exchanger.
The utility model major function 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 utility model 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 utility model technology 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 utility model has been simplified technical process, adopt preheating of air combined heat pipe exchanger and gas preheating combined heat pipe exchanger 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, make spent air temperture reduce to discharging below 150 ℃.
2,, make system's operation safer reliable because interchanger all adopts preheating of air combined heat pipe exchanger and gas preheating combined heat pipe exchanger, 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 utility model 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 utility model 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, the utility model system architecture 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 that the utility model adopted 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 utility model has overcome the some shortcomings that exist in the actual motion in the prior art, make system operation more economically, more energy-conservation, can be widely used in the smelting iron and steel industry.
The smoke outlet of hotblast stove described in the utility model is connected the top of preposition roasting kiln.Purpose is: 1, the useless flue-gas temperature of hotblast stove discharging generally about 300 ℃, wants sky, gas temperature are preheating to 250～350 ℃, must improve the spent air temperture of hotblast stove.2, preposition roasting kiln fuel is low-heat value gas, general furnace temperature is about 1000 ℃, so the hot-blast stove fume exit end is connected the top of preposition roasting kiln, be the exhanst gas outlet of precell, be controlled at after both flue gases mix and advance sky, gas preheating combined heat pipe exchanger between 500～550 ℃.The adjusting of mixed flue gas temperature relies on the coal combustion tolerance of preposition roasting kiln to control and gets final product.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Embodiment
As shown in Figure 1, the air that comes from freezing air house steward 14 is connected the air inlet of preheating 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 preheating 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 gas preheating 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 gas preheating 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 gas preheating combined heat pipe exchanger 16, preheating of 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 gas preheating combined heat pipe exchanger 16, preheating of 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 (2)
1. high-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace comprises cooled coal gas intake ducting, freezing air intake ducting, hotblast stove, burner, preposition roasting kiln, precell gas blower, preheating of air combined heat pipe exchanger, gas preheating combined heat pipe exchanger, induced draft fan and chimney; It is characterized in that described freezing air intake ducting is connected the air inlet end of described preheating of air combined heat pipe exchanger, the air outlet side of described preheating of air combined heat pipe exchanger is at the air inlet end of hotblast stove; Described cooled coal gas intake ducting is connected the gas inlet end of described gas preheating combined heat pipe exchanger, and the coal gas outlet side of described gas preheating combined heat pipe exchanger is connected to the gas inlet end of described hotblast stove and the gas inlet end of described burner; The outlet side of described precell gas blower is connected the air inlet end of described burner; The exit end of described burner is connected the entrance end of described preposition roasting kiln, described being positioned at put the smoke outlet that pushes up on the roasting kiln and is connected to the gas approach end of described preheating of air combined heat pipe exchanger and the gas approach end of gas preheating combined heat pipe exchanger, and the smoke outlet of the smoke outlet of described preheating of air combined heat pipe exchanger and gas preheating combined heat pipe exchanger is connected with chimney by induced draft fan respectively; The smoke outlet of described hotblast stove is connected to the gas approach end of described preheating of air combined heat pipe exchanger and the gas approach end of gas preheating combined heat pipe exchanger.
2. according to the described high-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace of claim 1, it is characterized in that the smoke outlet of described preposition hotblast stove is connected the top of preposition roasting kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202793664U CN201785422U (en) | 2010-07-29 | 2010-07-29 | High-air-temperature energy-saving emission-reduction combined preheating system of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202793664U CN201785422U (en) | 2010-07-29 | 2010-07-29 | High-air-temperature energy-saving emission-reduction combined preheating system of blast furnace |
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| Publication Number | Publication Date |
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| CN201785422U true CN201785422U (en) | 2011-04-06 |
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| CN2010202793664U Expired - Lifetime CN201785422U (en) | 2010-07-29 | 2010-07-29 | High-air-temperature energy-saving emission-reduction combined preheating system of blast furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928797A (en) * | 2010-07-29 | 2010-12-29 | 江苏中天能源设备有限公司 | High-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
| CN112555881A (en) * | 2020-10-27 | 2021-03-26 | 中冶南方都市环保工程技术股份有限公司 | Gas boiler air gas parallel connection integrated smoke temperature reduction energy-saving device |
-
2010
- 2010-07-29 CN CN2010202793664U patent/CN201785422U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928797A (en) * | 2010-07-29 | 2010-12-29 | 江苏中天能源设备有限公司 | High-blast-temperature energy-saving and emission-reducing combined type preheating system for blast furnace |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
| CN112555881A (en) * | 2020-10-27 | 2021-03-26 | 中冶南方都市环保工程技术股份有限公司 | Gas boiler air gas parallel connection integrated smoke temperature reduction energy-saving device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110406 |