CN101368221B - Dehumidification air feeding device for ironmaking blast furnace - Google Patents
Dehumidification air feeding device for ironmaking blast furnace Download PDFInfo
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- CN101368221B CN101368221B CN2008100714824A CN200810071482A CN101368221B CN 101368221 B CN101368221 B CN 101368221B CN 2008100714824 A CN2008100714824 A CN 2008100714824A CN 200810071482 A CN200810071482 A CN 200810071482A CN 101368221 B CN101368221 B CN 101368221B
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Abstract
The invention discloses a dehumidification air-supply device of a pudding blast furnace, which is a dehumidified blast device which does not adopt a normal refrigeration dehumidification method or a dehumidizer dehumidification method. A turbine pressurizing technology is used in the device to compress the air and then cool and dehumidify the air in a normal temperature. The device integrates the blast heating with air dehumidification, thus effectively avoiding the large-amount power consumption procedure of air compression and having the meanings of saving power and investment, reducing the occupied area of the device, and the like.
Description
Technical field
The invention belongs to field of metallurgy, it is related to blast furnace dehumidifying air-supply technology.
Background technology
Pre-dehumidified processing is carried out to blast furnace wind pushing air, coke ratio can be reduced, ensure hot metal output and quality, iron industry is referred to as dehumidified blast.That initially propose dehumidified blast method is American J.Gayley.1904, J.Gayley carried out reducing blast humidity (from 10~12g/m with cool drying method on No. 4 blast furnaces of Yi Sabaila factories of the U.S.3It is down to 3~3.5g/m3) dehumidified blast experiment.As a result, wind-warm syndrome improves 100 DEG C, and top temperature have dropped 90 DEG C, and CO2 brings up to 16%, output increased 25%, coke ratio reduction by 20% by 13% in coal gas (wherein half improves wind-warm syndrome and caused).In other bf test, yield increase by 9%~26%, coke ratio reduction by 7.3%~18.4%.Britain's bf test result, yield increase by 20%~27%, coke ratio reduction by 14%~18%.1913, the U.S. developed into fixed humidity air blast technique for blast is dried, i.e., blast humidity is fixed on certain level (5~6g/m3).When atmospheric humidity exceedes this level, dehumidification is dried in air blast；Conversely, then appropriate vapor is added in air blast.This had once been applied in Europe, the United States, furnace processor is improved 16%~27%, coke ratio reduction by 4%~18%.After the Japanese energy crisis from the seventies, the research and application of dehumidified blast technology are stepped up.1974---1976 Nippon Steel Corporations use moisture-free blower in places such as No. 1 blast furnaces of wide No. 4 blast furnaces of tobacco factory and big subsidiary factory, wherein the moisture-free blower of big subsidiary factory's blast furnace, which achieves coke ratio, reduces 8kg/t effect, a year and a half is to have reclaimed fully invested.Then, dehumidified blast technology has obtained positive development in Japan.In recent years, many iron and steel enterprises of China also applied dehumidified blast technology.
Dehumidifying device mainly has two kinds of forms by principle point：(1)Humectant dehumidification method：Humectant, absorption air moisture are made of lithium chloride.Lithium chloride after water suction can be recycled with thermal regeneration.But regeneration humectant needs consumption of calorie；Meanwhile, absorption drying can make air blast latent heat be changed into sensible heat, raise blast furnace blower intake air temperature, cause the increase of its power consumption.Obviously, the energy consumption of dehumidification and air blower association system, the independent fan energy use than not dehumidification is much higher.Humectant dehumidification method has point of dry type and wet type again, and the management of dry-chlorinated lithium dehumidification method is more complicated；Wet type lithium chloride dehumidification method has strong corrosion effect to blower vane.(2)Cool down dehumidification method：The cooling of air blast moisture is set to condense and dehumidification with the method for refrigeration.Dehumidification law technology comparative maturity is cooled down, large-scale refrigeration unit need to be equipped with, investment is big, and operation power consumption is also larger.Also someone was doing absorption refrigeration unit cooling dehumidification method in recent years, and because the lowest refrigerating temperature of absorption refrigeration unit is higher, dehumidification degree may be not ideal, needs miscellaneous equipment with further dehumidification processing is cooperated, adds system complexity.In addition, also have joint dehumidification method (cooling method+humectant method), can be very lowly de- by blast humidity, but energy consumption is big, and operation maintenance, management are more complicated.
Proposed by the present invention is atypical air compression dehumidification method：Air compression, normal temperature cooling dehumidification.
From the general psychrometric chart of humid air：Air compression, normal temperature cooling and dehumidifying, can also reach qualified blast furnace blasting humidity index, and this is the general principle of the present invention.For example：Air is compressed to 6bar (absolute pressure), 37 DEG C are cooled to it, the humidity of air is just smaller than 7 (gram water/kg of air per kg of water evaporated).Air compression will consume many mechanical energy, because blast furnace air intake requires higher wind-warm syndrome (most wind-warm syndrome is higher than 1000 DEG C), this provides for turbine expansion driving Compressor Technology and puts space to good use, the present invention borrows large combustion engines exhaust-driven turbo-charger exhaust-gas turbo charger Technology design set of device, to reach the purpose of blast furnace dehumidifying air-supply, the wholesale power consumption link of dehumidification process is effectively avoided.
The content of the invention
A kind of dehumidification air feeding device for ironmaking blast furnace, it is single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace or two turbocharging dehumidification air feeding device for ironmaking blast furnace.
This is a kind of air compression dehumidification method, and technology for Turbocharger Manufacturing is the core technology of the technology.Because the requirement of blast furnace air intake is heated to higher temperature, this partial air heating heat energy can be subject to cascade utilization, the driving force as turbocharger turbine expanding end by turbocharger, drive the rotating shaft at turbocharger compressor end to be compressed air, compressed air is cooled down at normal temperatures can be removed wet part, then reheating is turned one's head into the expansion of turbocharger turbine end, reaches a thermodynamic cycle.In addition, allowing compressed air to expand end leaves overbottom pressure, it can also effectively mitigate air blower power load.Here turbocharger also visual same external combustion heat engine, similar gas turbine, this is application of the gas turbine technology in blast furnace air-supply in other words.
In recent years, domestic large combustion engines exhaust-driven turbo-charger exhaust-gas turbo charger manufacturing industry has reached higher level, and price is also very cheap, and this is the invention provides good application conditions.The preferable operation pressure ratio of single-stage turbocharger is mainly in 2-3 or so, gross efficiency about 65% or so, and the gross efficiency of some products is even up to 70%.Pressure ratio is more than the less efficient of 5 high pressure ratio turbocharger, and home products selection face is also narrower, and external product is on the high side, and maintenance is also inconvenient.To avoid the weakness of high pressure ratio turbocharger, the present invention proposes two turbocharging method, will the series connection of two turbocharger, carry out therebetween cooling during rolling and it is middle heat, reach pressure ratio increase, humidity except obtaining lower purpose.
Single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace, as shown in figure 1, removing wet tank (5.), circulating cooling water tower (6.), circulating cooling water pump (7.), compressed air heating furnace (8.), air-heating furnace (10.), turbocharger launch motor including turbocharger, the air inducing air cleaning case (1.) of tape drum fan section, air return heating device for hot (3.), air condensation water drainage valve (4.), compressed air
Surrounding air enters air inducing air cleaning case (1.) dust removal and filtration of tape drum fan section, and state is
Enter the supercharging air end (2.) of turbocharger after dust removal and filtration, air obtains heating compression and forms compressed air, reaches state
Then, the low temperature compressed air heat exchange that compressed air air inlet regenerator (3.) comes with opposite is cooled down, the compressed air come out from regenerator (3.) enters compressed air and removes wet tank (5.), compressed air is cooled, bears condensate dehumidifying, forms drying compressed air, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank (5.), driven by circulating cooling water pump (7.), recirculated water radiates in circulating cooling water tower (6.), compressed air condensate in compressed air removes wet tank (5.) is discharged by air condensation water drainage valve (4.), and the state that wet tank (5.) comes out is removed from compressed air
Compressed air enters regenerator (3.), the state come with opposite
Compressed air heat exchange, heating, next go to compressed air heating furnace (8.) and continue absorb heat heating, the state after heatingCompressed air enters air expanding end (9.) expansion working of turbocharger, while temperature and pressure will also decrease, state is
Overbottom pressure is still left, the state after expansion
Air air inlet heating furnace (10.) reheats heating, is finally reached state
Blast furnace is sent into, its air flow thermodynamic table is stated as shown in Figure 3.The control method of single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace is, when blasting humidity is higher, to improve expanding end inlet condition
Temperature；When blasting humidity is relatively low, expanding end inlet condition is reduced
Temperature.
Two turbocharging dehumidification air feeding device for ironmaking blast furnace, as shown in Fig. 2 the air inducing air cleaning case (1.) including tape drum fan section, two turbocharger, air return heating device for hot (3.), air condensation water drainage valve (4.), compressed airs remove wet tank (5.), circulating cooling water tower (6.), circulating cooling water pump (7.), compressed air heating furnace (8.), air-heating furnace (10.), turbocharger launch motor
Surrounding air enters air inducing air cleaning case (1.) dust removal and filtration of tape drum fan section, and state is
Enter the supercharging air end (2.) of turbocharger after dust removal and filtration, air obtains heating compression and forms primary compression air, reaches stateThen, compressed air enters compressed air except wet tank (5.) cools, and preliminary dehumidifying, reaches state therebetween
StateAir enters the supercharging air end (2.) of two-stage turbocharger, again booster compression, forms compressed air, reaches state
Then, the low temperature compressed air heat exchange that compressed air air inlet regenerator (3.) comes with opposite is cooled down, the compressed air come out from regenerator (3.) enters compressed air and removes wet tank (5.), compressed air is cooled, bears condensate dehumidifying, forms drying compressed air wherein, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank (5.), driven by circulating cooling water pump (7.), recirculated water radiates in circulating cooling water tower (6.), compressed air condensate in compressed air removes wet tank (5.) is discharged by air condensation water drainage valve (4.), and the state that wet tank (6.) comes out is removed from compressed airCompressed air enters regenerator (3.), the state come with opposite
Compressed air heat exchange, heating, next go to compressed air heating furnace (8.) and continue heating of absorbing heat, reach stateState
Compressed air enters air expanding end (9.) expansion working of turbocharger, while temperature and pressure will also decrease, as stateState
Air is again introduced into the heated heating of compressed air heating furnace (8.), as state
Subsequently into air expanding end (9.) expansion working of next stage turbocharger, while temperature and pressure will also decrease, as state
State
Air still leaves overbottom pressure, subsequently into air-heating furnace (10.), is finally reached state
Blast furnace is sent into, its air flow thermodynamic table is stated as shown in Figure 4.The control method of two turbocharging dehumidification air feeding device for ironmaking blast furnace is, when blasting humidity is higher, to improve expanding end inlet conditionTemperature；When blasting humidity is relatively low, expanding end inlet condition is reduced
Temperature.
Brief description of the drawings
Fig. 1 is part in single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace schematic diagram, figure：The air inducing air cleaning case of tape drum fan section 1., the supercharging air end of turbocharger 2., air return heating device for hot 3., air condensation water drainage valve 4., compressed air except wet tank 5., circulating cooling water tower 6., circulating cooling water pump 7., compressed air heating furnace 8., the air expanding end of turbocharger 9., air-heating furnace 10., turbocharger launch motorIn addition：
The state point before supercharging air is represented,
The state point after supercharging air is represented,
Represent air and leave the state point that compressed air removes wet tank,
Represent air and be heated state point rear, before turbocharger expansion end is entered,
The state point after air expansion is represented,
Air is represented to blow into blast furnace state point.
Fig. 2 is part in two turbocharging dehumidification air feeding device for ironmaking blast furnace schematic diagram, figure：The air inducing air cleaning case of tape drum fan section 1., the supercharging air end of turbocharger 2., air return heating device for hot 3., air condensation water drainage valve 4., compressed air except wet tank 5., circulating cooling water tower 6., circulating cooling water pump 7., compressed air heating furnace 8., the air expanding end of turbocharger 9., air-heating furnace 10., turbocharger launch motor
In addition：
Air inlet state point is represented,
The state point after the supercharging of air one-level is represented,The state point before secondary air supercharging is represented,
The state point after air two-stage supercharging is represented,Represent air and leave the state point that compressed air removes wet tank,
Represent air and be heated state point rear, before turbocharger expansion end is entered,
The state point after air primary expansion is represented,
The state point before air compound expansion is represented,The state point after air compound expansion is represented,
Air is represented to blow into blast furnace state point.
Fig. 3 is thermodynamics tephigram of the air in single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace, in figure
Difference corresponding diagram 1
Fig. 4 is thermodynamics tephigram of the air in two turbocharging dehumidification air feeding device for ironmaking blast furnace, in figure
Difference corresponding diagram 2 
Embodiment
Embodiment 1：Single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace.
As shown in figures 1 and 3：Surrounding air enters the air inducing air cleaning case 1. dust removal and filtration of tape drum fan section, is
After state, dust removal and filtration into the supercharging air end of turbocharger 2., air obtains heating compression and forms compressed air, reaches
State.Then, the low temperature compressed air heat exchange cooling that 3. compressed air air inlet regenerator comes with opposite.3. air return heating device for hot is adverse current type air-air heat exchanger, it is desirable to have certain resistance to pressure request.Enter compressed air from the compressed air of regenerator 3. out and remove wet tank 5., 5. compressed air is actually an air-water heat exchanger except wet tank, compressed air is cooled, bears condensate dehumidifying, forms drying compressed air wherein, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank 5., is 7. driven by circulating cooling water pump, 6. recirculated water radiate in circulating cooling water tower, and 4. the compressed air condensate in 5. compressed air removes wet tank is discharged by air condensation water drainage valve.5. come out except wet tank from compressed air
3. the compressed air of state enters regenerator, comes with opposite
The heat exchange of state compressed air, heating, next go to compressed air heating furnace and 8. continue heat absorption heating, reachState.Due to conventional turbocharger making material heat resistance,
The compressed air temperature of state can not typically exceed 700 DEG C, and the thermal source of compressed air heating furnace 8. can use the used heat of blast furnace.
The compressed air of state is high-temperature high-pressure state, possesses external capacity for work, into the air expanding end 9. expansion working of turbocharger, while temperature and pressure will also decrease, is eventually becomeState,
State still leaves overbottom pressure.Because the air intake wind-warm syndrome of blast furnace requires higher (being more than 1000 DEG C),
The air of state needs further heat temperature raising,
10. the air air inlet heating furnace of state, is finally reachedState, sends into blast furnace.
The main driving equipment of package unit is turbocharger, and the starting of turbocharger needs external force to act on, so devising a turbocharger launch motor here
It is connected in turbocharger shaft.
The pressure ratio of turbocharger is the heating and temperature control by compressed air heating furnace 8..Heating-up temperature is raised, pressure ratio increase；Heating-up temperature is reduced, and pressure ratio reduces.
Thermodynamic process of the air in package unit is stated by Fig. 3：
Extremely
For adiabatic compression process,
Extremely
For cooling and dehumidifying process,
Extremely
For heated compressed air process,
Extremely
For high temperature compressed air adiabatic expansion work,
Extremely
To dry hot-air thermal process again.
ExtremelyThe work done of process is mainly used forExtremelyCompression wasted work.
Embodiment 2：Two turbocharging dehumidification air feeding device for ironmaking blast furnace.
Cold, reheating link in a turbocharger and increase is the increase in single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace main difference.As shown in Figure 2 and Figure 4, surrounding air enters the air inducing air cleaning case 1. dust removal and filtration of tape drum fan section, is
After state, dust removal and filtration into the supercharging air end of turbocharger 2., air obtains heating compression and forms primary compression air, reaches
State, then, compressed air enter compressed air except 5. wet tank cools, and preliminary dehumidifying therebetween reaches
State.
2. state primary compression air enters the supercharging air end of two-stage turbocharger, again booster compression, forms compressed air, reaches
State.Then, the low temperature compressed air heat exchange cooling that 3. compressed air air inlet regenerator comes with opposite.Air return heating device for hot is 3. empty for adverse current type -- empty heat exchanger, it is desirable to have certain resistance to pressure request.Enter compressed air from the compressed air of regenerator 3. out and remove wet tank 5., 5. compressed air is actually an air-water heat exchanger except wet tank, compressed air is cooled, bears condensate dehumidifying, forms drying compressed air wherein, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank 5., is 7. driven by circulating cooling water pump, 6. recirculated water radiate in circulating cooling water tower, and 4. the compressed air condensate in 5. compressed air removes wet tank is discharged by air condensation water drainage valve.5. come out except wet tank from compressed air
3. the compressed air of state enters regenerator, comes with opposite
The heat exchange of state compressed air, heating, next go to compressed air heating furnace and 8. continue heat absorption heating, reach
State.Due to conventional turbocharger making material heat resistance,
The compressed air temperature of state can not typically exceed 700 DEG C, and the thermal source of compressed air heating furnace 8. can use the used heat or blast furnace gas of blast furnace.
The compressed air of state is high-temperature high-pressure state, possesses external capacity for work, into the air expanding end 9. expansion working of turbocharger, while temperature and pressure will also decrease, is turned into
State.
State air is again introduced into compressed air heating furnace, and 8. heated heating turns intoState, subsequently into the air expanding end 9. expansion working of next stage turbocharger, while temperature and pressure will also decrease, turns into
State,State still leaves overbottom pressure.Because the air intake wind-warm syndrome of blast furnace requires higher (being more than 1000 DEG C),
The air of state needs further heat temperature raising,10. the air air inlet heating furnace of state, is finally reached
State, sends into blast furnace.
The main driving equipment of package unit is turbocharger, and the starting of turbocharger needs external force to act on, so devising turbocharger launch motor here
It is connected in turbocharger shaft.
The pressure ratio of turbocharger is the heating and temperature control by compressed air heating furnace 8..Heating-up temperature is raised, pressure ratio increase；Heating-up temperature is reduced, and pressure ratio reduces.
Thermodynamic process of the air in device such as Fig. 4 is stated.
Claims (3)
1. a kind of dehumidification air feeding device for ironmaking blast furnace, it is characterized in that：It is single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace or two turbocharging dehumidification air feeding device for ironmaking blast furnace；Single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace includes turbocharger, the air inducing air cleaning case (1.) of tape drum fan section, air return heating device for hot (3.), air condensation water drainage valve (4.), compressed air and removes wet tank (5.), circulating cooling water tower (6.), circulating cooling water pump (7.), compressed air heating furnace (8.), air-heating furnace (10.), turbocharger launch motor
Surrounding air enters air inducing air cleaning case (1.) dust removal and filtration of tape drum fan section, and state isEnter the supercharging air end (2.) of turbocharger after dust removal and filtration, air obtains heating compression and forms compressed air, reaches state
Then, the low temperature compressed air heat exchange that compressed air air inlet regenerator (3.) comes with opposite is cooled down, the compressed air come out from regenerator (3.) enters compressed air and removes wet tank (5.), compressed air is cooled, bears condensate dehumidifying, forms drying compressed air, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank (5.), driven by circulating cooling water pump (7.), recirculated water radiates in circulating cooling water tower (6.), compressed air condensate in compressed air removes wet tank (5.) is discharged by air condensation water drainage valve (4.), and the state that wet tank (5.) comes out is removed from compressed air
Compressed air enters regenerator (3.), the state come with opposite
Compressed air heat exchange, heating, next go to compressed air heating furnace (8.) and continue absorb heat heating, the state after heating
Compressed air enters air expanding end (9.) expansion working of turbocharger, while temperature and pressure will also decrease, state is
Overbottom pressure is still left, the state after expansion
Air air inlet heating furnace (10.) reheats heating, is finally reached state
Send into blast furnace；Two turbocharging dehumidification air feeding device for ironmaking blast furnace includes the air inducing air cleaning case (1.) of tape drum fan section, two turbocharger, air return heating device for hot (3.), air condensation water drainage valve (4.), compressed airs and removes wet tank (5.), circulating cooling water tower (6.), circulating cooling water pump (7.), compressed air heating furnace (8.), air-heating furnace (10.), turbocharger launch motor
Surrounding air enters air inducing air cleaning case (1.) dust removal and filtration of tape drum fan section, and state isEnter the supercharging air end (2.) of turbocharger after dust removal and filtration, air obtains heating compression and forms primary compression air, reaches stateThen, compressed air enters compressed air except wet tank (5.) cools, and preliminary dehumidifying, reaches state therebetween
State
Air enters the supercharging air end (2.) of two-stage turbocharger, again booster compression, forms compressed air, reaches state
Then, the low temperature compressed air heat exchange that compressed air air inlet regenerator (3.) comes with opposite is cooled down, the compressed air come out from regenerator (3.) enters compressed air and removes wet tank (5.), compressed air is cooled, bears condensate dehumidifying, forms drying compressed air wherein, and state is
Compressed air is normal temperature circulation water except the cooling source of wet tank (5.), driven by circulating cooling water pump (7.), recirculated water radiates in circulating cooling water tower (6.), compressed air condensate in compressed air removes wet tank (6.) is discharged by air condensation water drainage valve (4.), and the state that wet tank (6.) comes out is removed from compressed air
Compressed air enters regenerator (3.), the state come with oppositeCompressed air heat exchange, heating, next go to compressed air heating furnace (8.) and continue heating of absorbing heat, reach state
State
Compressed air enters air expanding end (9.) expansion working of turbocharger, while temperature and pressure will also decrease, as stateState
Air is again introduced into the heated heating of compressed air heating furnace (8.), as state
Subsequently into air expanding end (9.) expansion working of next stage turbocharger, while temperature and pressure will also decrease, as state
State
Air still leaves overbottom pressure, subsequently into air-heating furnace (10.), is finally reached state
Send into blast furnace.
2. according to a kind of dehumidification air feeding device for ironmaking blast furnace described in claim 1, it is characterized in that：The control method of described single-stage turbocharging dehumidification air feeding device for ironmaking blast furnace is, when blasting humidity is higher, to improve state
Temperature；When blasting humidity is relatively low, state is reduced
Temperature.
3. according to a kind of dehumidification air feeding device for ironmaking blast furnace described in claim 1, it is characterized in that：The control method of described two turbocharging dehumidification air feeding device for ironmaking blast furnace is, when blasting humidity is higher, to improve state
Temperature；When blasting humidity is relatively low, state is reduced
Temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100714824A CN101368221B (en) | 2008-07-28 | 2008-07-28 | Dehumidification air feeding device for ironmaking blast furnace |
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| CN2008100714824A CN101368221B (en) | 2008-07-28 | 2008-07-28 | Dehumidification air feeding device for ironmaking blast furnace |
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| CN101368221B true CN101368221B (en) | 2011-03-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101514378B (en) * | 2009-02-26 | 2011-07-20 | 中冶赛迪工程技术股份有限公司 | Back dehumidifying device of stove blower |
| CN102628090B (en) * | 2012-04-20 | 2014-07-23 | 江苏煌明能源科技有限公司 | Energy-saving and consumption-reducing method for air supply system of metallurgy blast furnace |
| CN103540699B (en) * | 2013-09-30 | 2016-02-10 | 哈尔滨空调股份有限公司 | For Two-stage refrigeration dehumidification device of blast-furnace blast filtration dehumidification unit |
| CN107551818A (en) * | 2017-09-18 | 2018-01-09 | 中国科学院理化技术研究所 | Methanol purge gas pressure energy recovery system and method |
| CN108361057B (en) * | 2018-02-01 | 2024-03-15 | 北京京能科技有限公司 | Bubble dust remover |
| CN110715475B (en) * | 2019-11-28 | 2021-06-18 | 广东美的制冷设备有限公司 | Operation control method, compressed air heat exchange system and storage medium |
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