CN102952913B - Dual-preheating method and device for preheating blast furnace gas by using heat-storage-type preheating furnace - Google Patents
Dual-preheating method and device for preheating blast furnace gas by using heat-storage-type preheating furnace Download PDFInfo
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- CN102952913B CN102952913B CN201210450233.2A CN201210450233A CN102952913B CN 102952913 B CN102952913 B CN 102952913B CN 201210450233 A CN201210450233 A CN 201210450233A CN 102952913 B CN102952913 B CN 102952913B
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Abstract
The invention relates to the field of blast furnace hot blast stove preheating, in particular to a dual-preheating method and a dual-preheating device for preheating blast furnace gas by using a heat-storage-type preheating furnace. The dual-preheating method for preheating blast furnace gas by using the heat-storage-type preheating furnace is characterized in that partial blast furnace gas is preheated to 1000-1200DEG C by using the heat-storage-type preheating furnace, the preheated high-temperature gas is mixed with 40-80DEG C low-temperature gas, the temperature of the mixed gas is controlled to be 300-350DEG C and the mixed gas is fed to a hot blast stove; and at the same time, combustion-supporting air is preheated to 200-230DEG C and is fed to the hot blast stove, and blast furnace blast temperature which is not lower than 1250DEG C can be realized under the condition that blast furnace gas is solely combusted. Compared with the prior art, the dual-preheating method and the dual-preheating device for preheating blast furnace gas by using the heat-storage-type preheating furnace have the advantages that: 1) the problems of blockage caused by ash accumulation, acid corrosion, great system resistance loss, low preheating temperature and the like existing in a metallic heat exchanger are solved; 2) the efficiency and the practicability are high; 3) the effect of increasing air temperature by preheating gas is obviously better than the effect of preheating air; and 4) the stable working the long service life and the high efficiency of ceramic burners of the hot blast stove are facilitated.
Description
Technical field
The present invention relates to the preheating field that blast funnace hot blast stove burns stove coal gas and combustion air, particularly relate to a kind of two pre-heating mean and the device that adopt heat accumulating type preheating oven preheating blast furnace gas.
Background technology
Improving the most direct method of blast furnace blast temperature is adopt high heating value gas as the burning stove fuel of hotblast stove, the self-produced high heating value gas of Steel Complex has coke-oven gas and coal gas of converter, these high heating value gases are generally used for Steel Mill and civilian, be rarely used in blast funnace hot blast stove, even if some Steel Plant can provide a small amount of high heating value gas to blast funnace hot blast stove, easily block stove fillings passage due to the tar in coal gas, dust and acid and cause checker brick surface scorification, reducing lifetime of hot-air stove and efficiency.Therefore, current domestic and international most of blast furnace generally uses blast furnace gas as the burning stove fuel of hotblast stove.
The another kind of method improving blast temperature carries out preheating to the blast furnace gas of hot blast stove burning and combustion air, and this method is particularly useful for the iron and steel enterprise of single use blast furnace gas as the burning stove fuel of hotblast stove.Because blast furnace gas is a kind of inflammable, explosive and hypertoxic gas, for explosion-proof gas defence, domestic and international blast furnace ironmaking industry generally adopts metal pipe type interchanger or metal plate type interchanger preheating blast furnace gas, gas preheating temperature about 200 DEG C, combustion air temperature is preheated to more than 500 DEG C simultaneously, the wind-warm syndrome higher than 1250 DEG C can be obtained like this under the condition of single fire blast furnace gas.Combustion air temperature is preheated to more than 500 DEG C and can brings following problem: one is the excessive temperature differentials of combustion air and coal gas, the ceramic burner masonry of hotblast stove can produce stress, affect the ceramic burner life-span, two be comburent air duct and valve by high temperature design, increase investment.
Summary of the invention
The object of the present invention is to provide a kind of two pre-heating mean and the device that adopt heat accumulating type preheating oven preheating blast furnace gas, the shortcoming such as overcome easy dust stratification blocking, acid attack that metal pipe type interchanger or metal plate type interchanger preheating gas technique exists, system resistance is damaged greatly, preheating temperature is low; Reduce the temperature difference of air and coal gas, be conducive to steady operation and the long-service life high-efficiency of ceramic combustor of hot-blast stove.
For solving the problems of the technologies described above, technical scheme of the present invention is:
Adopt two pre-heating means of heat accumulating type preheating oven preheating blast furnace gas, adopt heat accumulating type preheating oven that part blast furnace gas is preheated to 1000 DEG C-1200 DEG C, coal gas of high temperature after preheating mixes with the low temperature coal gas of 40-80 DEG C, and mixed gas temperature controls at 300 DEG C-350 DEG C wind furnaces that reduce phlegm and internal heat; Combustion air is preheated to 200 DEG C-230 DEG C wind furnaces that reduce phlegm and internal heat, under single fire blast furnace gas condition, just can realize the blast furnace blast temperature being not less than 1250 DEG C like this, its concrete operation step is as follows simultaneously:
1) when heat accumulating type preheating oven is in main combustion period, low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve are closed, combustion air inlet trip valve, burning producer gas entrance trip valve and exhanst gas outlet trip valve are opened, combustion air and coal gas enter burner and fully mix and enter combustion chambers burn again, the high-temperature flue gas produced enters regenerator and checker brickwork is heated to more than 1200 DEG C, and the low-temperature flue gas after heat exchange discharges through exhanst gas outlet;
2) when heat accumulating type preheating oven by main combustion period to when on air changing stove, reduce combustion air inlet control valve opening in advance, reduce coefficient of excess air, control in stove that in residual flue gas, oxygen level is lower than safe concentration, the temperature according to exhanst gas outlet determines cold stoking or changes stove;
3) when heat accumulating type preheating oven is on air, open low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve, close combustion air inlet trip valve, burn producer gas entrance trip valve and exhanst gas outlet trip valve, the low temperature coal gas of part 40-80 DEG C enters by below regenerator, the coal gas of high temperature of 1000 DEG C ± 200 DEG C is heated to when checker brickwork, coal gas of high temperature enters mixing section through pipeline, and the heating gas being mixed into 300 DEG C ± 50 DEG C with 40-80 DEG C of low temperature coal gas gives blast funnace hot blast stove;
4) when heat accumulating type preheating oven is by when on air changing stove to main combustion period, now introduce flue gas and coal gas of high temperature residual in stove is driven the recovery realizing residual coal gas to high temperature gas line, open flue gas blower fan, exhanst gas outlet trip valve and coal gas of high temperature outlet trip valve, close combustion air inlet trip valve and low temperature coal gas entrance trip valve, flue gas is forced to pass into from exhanst gas outlet by flue gas blower fan, the coal gas of high temperature remained in stove is driven in high temperature gas line, when in stove, gas composition is less than 1-2%
time, heat accumulating type preheating oven proceeds to main combustion period, repeating step 1).
When heat accumulating type preheating oven by main combustion period to when on air changing stove, for preventing gas explosion and ensureing gas quality not by the impact of flue gas, flue gas is driven in flue with burning producer gas, namely combustion air inlet trip valve is closed, low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve, open and burn producer gas entrance trip valve and exhanst gas outlet trip valve, flue gas residual in stove is driven in flue, then change stove and proceed to main combustion period, burn the closedown of producer gas entrance trip valve and exhanst gas outlet trip valve or time-delay closing to be controlled by oxygen determination instrument that flue is arranged and gas composition measurement.
Adopt the device of two pre-heating means of above-mentioned heat accumulating type preheating oven preheating blast furnace gas, the coal gas of high temperature outlet of heat accumulating type preheating oven is connected with the coal gas of high temperature entrance of mixing section by coal gas of high temperature pipeline, the low temperature coal gas entrance of mixing section is connected with low temperature coal gas pipeline, and the mixed gas outlet of mixing section connects hotblast stove; The smoke inlet of air heat exchanger is connected with hotblast stove flue collector respectively with outlet, and the hot air outlet of air heat exchanger connects hotblast stove.
The structure formation of described heat accumulating type preheating oven is the one in external combustion type, internal combustion type or top ignition.
The minimum number of described heat accumulating type preheating oven is two, and its working system is that 1 burning 1 is sent.
The flue outlet place of described heat accumulating type preheating oven is provided with flue gas blower fan.
The combustion air inlet of described heat accumulating type preheating oven is connected with combustion air variable valve with combustion air inlet trip valve successively, the burning gas entry of heat accumulating type preheating oven, successively with burning producer gas entrance trip valve with burns producer gas inlet adjustment valve and be connected, is respectively equipped with mechanical chain formula diffusion valve one and diffusion valve two between combustion air inlet trip valve and combustion air variable valve and between burning producer gas entrance trip valve and burning producer gas inlet adjustment valve.
The flue of described heat accumulating type preheating oven is provided with the rupture disk and water seal that prevent flammable gas explosion.
Compared with prior art, the invention has the beneficial effects as follows: the problem such as 1) solve easy dust stratification blocking, acid attack that metal pipe type interchanger or metal plate type interchanger preheating gas technique exists, system resistance is damaged greatly, preheating temperature is low.2) there is the feature of highly effective, blast furnace iron-making process consumable blast furnace gas accounts for 40% of blast furnace self produced gas amount, about 30% other user giving comprehensive Steel Plant, 30% burning is diffused and is entered air or give CCPP unit generation, the efficiency of CCPP unit generation is only 40%, and efficiency is very low, and is used for blast furnace gas to heat preheating oven, thermo-efficiency can up to 80%, and thus the present invention has obvious economic benefit and wide application prospect.3) when preheating temperature is identical, the successful that preheating gas improves wind-warm syndrome is greater than preheated air.4) reduce the temperature difference of air and coal gas, be conducive to steady operation and the long-service life high-efficiency of ceramic combustor of hot-blast stove, reduce the investment of comburent air duct and valve.
Accompanying drawing explanation
Fig. 1 is the two preheating flow process structural representation of the present invention.
In figure: 1-heat accumulating type preheating oven 2-mixing section 3-air heat exchanger 4-comburent air duct 5-hotblast stove flue collector 6-bypass pipe 7-coal gas of high temperature pipeline 8-low temperature coal gas pipeline 9-mixed gas outlet 10-low temperature coal gas entrance trip valve 11-coal gas of high temperature outlet trip valve 12-diffusion valve one 13-diffusion valve two 14-burns producer gas entrance trip valve 15-and burns producer gas inlet adjustment valve 16-burner blower 17-combustion air inlet trip valve 18-combustion air variable valve 19-flue gas blower fan 20-exhanst gas outlet trip valve 21-flue 22-chimney 23-rupture disk 24-water seal 25-burning producer gas pipeline 26-by-pass valve
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
See Fig. 1, two preheating flow process structural representations that the present invention adopts heat accumulating type preheating oven preheating blast furnace gas, the coal gas of high temperature outlet of heat accumulating type preheating oven 1 is connected with the coal gas of high temperature entrance of mixing section 2 by coal gas of high temperature pipeline 7, the low temperature coal gas entrance of mixing section 2 is connected with low temperature coal gas pipeline 8, and the mixed gas outlet 9 of mixing section 2 connects hotblast stove; The smoke inlet of air heat exchanger 3 is connected with hotblast stove flue collector 5 respectively with outlet, the hot air outlet of air heat exchanger 3 connects hotblast stove, air heat exchanger 3 is plate-type heat exchanger or tubular heat exchanger, in parallelly with air heat exchanger 3 on hotblast stove flue collector 5 set up bypass pipe 6, when normally producing, unnecessary flue gas flow is through bypass pipe 6, when air heat exchanger 3 overhauls, the whole flue gas flow of hotblast stove enters chimney 22 through bypass pipe 6, and bypass pipe 6 is provided with by-pass valve 26, for the adjustment of by pass flue flow.Burner blower 16 is connected with the combustion air inlet of heat accumulating type preheating oven 1 through comburent air duct 4, combustion air inlet trip valve 17, combustion air variable valve 18.Burn producer gas pipeline 25 to be connected with the burning gas entry of heat accumulating type preheating oven 1 by burning producer gas entrance trip valve 14, burning producer gas inlet adjustment valve 15, between combustion air inlet trip valve 17 and combustion air variable valve 18 and burn producer gas entrance trip valve 14, burn between producer gas inlet adjustment valve 15 and be respectively equipped with mechanical chain formula diffusion valve 1 and diffusion valve 2 13, residual coal gas when changing stove between automatic relief valve and air, prevent coal gas and interpenetrating of air from setting off an explosion.
The structure formation of heat accumulating type preheating oven 1 is the one in external combustion type (namely combustion chamber is separated setting with regenerator) preheating oven, internal combustion type (i.e. combustion chamber and regenerator concentrated setting, with refractory brickwork by combustion chamber and regenerator isolation) preheating oven and top ignition (namely combustion chamber is arranged on above regenerator) preheating oven.
The flue outlet place of heat accumulating type preheating oven 1 is provided with flue gas blower fan 19.Coal gas of high temperature pipeline 7 is established gas composition proofing unit.Flue outlet place is provided with oxygen determination instrument and gas composition measuring apparatus.The flue 21 of heat accumulating type preheating oven is provided with the rupture disk 23 and water seal 24 that prevent flammable gas explosion, and when system once blast, when system pressure transfinites, rupture disk and water seal open pressure release automatically, to ensure the safety of whole system.
In flow process of the present invention, minimum needs two heat accumulating type preheating ovens, the working system of heat accumulating type preheating oven 1 and heat accumulating type preheating oven 1 ' is that 1 burning 1 is sent.
Of the present invention pair of pre-heating mean adopts heat accumulating type preheating oven that part blast furnace gas is preheated to 1000 DEG C-1200 DEG C, and the coal gas of high temperature after preheating mixes with the low temperature coal gas of 40-80 DEG C, and mixed gas temperature controls at 300 DEG C-350 DEG C wind furnaces that reduce phlegm and internal heat; Utilize hot-blast stove fume and metallic recuperator combustion air to be preheated to 200 DEG C-230 DEG C wind furnaces that reduce phlegm and internal heat simultaneously, blast furnace coal tolerance due to hotblast stove use is 2 times of combustion air weight, and under the same terms the specific heat of blast furnace gas higher than air, therefore when preheating temperature is identical, the successful that preheating gas improves wind-warm syndrome is greater than preheated air, under single fire blast furnace gas condition, just can realize the blast furnace blast temperature being not less than 1250 DEG C like this, its concrete operation step is as follows:
1) when heat accumulating type preheating oven is in main combustion period, low temperature coal gas entrance trip valve 10 and coal gas of high temperature outlet trip valve 11 are closed, combustion air inlet trip valve 17, burning producer gas entrance trip valve 14 and exhanst gas outlet trip valve 20 are opened, combustion air and coal gas enter burner and fully mix and enter combustion chambers burn again, the high-temperature flue gas produced enters regenerator and is heated to more than 1200 by checker brickwork, and the low-temperature flue gas after heat exchange discharges through flue 21 and chimney 22;
2) when heat accumulating type preheating oven by main combustion period to when on air changing stove, reduce combustion air inlet variable valve 18 aperture in advance, reduce coefficient of excess air, in control stove, in residual flue gas, oxygen level is lower than safe concentration, and the temperature according to exhanst gas outlet determines cold stoking or changes stove;
3) when heat accumulating type preheating oven is on air, open low temperature coal gas entrance trip valve 10 and coal gas of high temperature outlet trip valve 11, close combustion air inlet trip valve 17, burn producer gas entrance trip valve 14 and exhanst gas outlet trip valve 20, the low temperature coal gas of part 40-80 DEG C enters by below regenerator, the coal gas of high temperature of 1000 DEG C ± 200 DEG C is heated to when checker brickwork, coal gas of high temperature enters mixing section 2 through coal gas of high temperature pipeline 7, and the heating gas being mixed into 300 DEG C ± 50 DEG C with 40-80 DEG C of low temperature coal gas gives hotblast stove;
4) when heat accumulating type preheating oven is by when on air changing stove to main combustion period, now introduce flue gas and coal gas of high temperature residual in stove is driven the recovery realizing residual coal gas to high temperature gas line 7, open flue gas blower fan 19, exhanst gas outlet trip valve 20 and coal gas of high temperature outlet trip valve 11, close combustion air inlet trip valve 17 and low temperature coal gas entrance trip valve 10, flue gas is forced to pass into from exhanst gas outlet by flue gas blower fan 19, the coal gas of high temperature remained in stove is driven in high temperature gas line 7, gas composition is established to detect to determine whether there is residual coal gas in stove at coal gas of high temperature outlet stool, when in stove, gas composition is less than 1-2%, heat accumulating type preheating oven 1 proceeds to main combustion period, repeating step 1).
When heat accumulating type preheating oven by main combustion period to when on air changing stove, in stove, entrap bubble is high-temperature flue gas, in flue gas containing have an appointment 4% oxygen, coal gas enters in stove can there is partial combustion, even blast, and when remaining flue gas enters in coal gas, gas quality can be affected, for preventing gas explosion and ensureing gas quality not by the impact of flue gas, flue gas is driven in flue with burning producer gas, namely combustion air inlet trip valve 17 is closed, low temperature coal gas entrance trip valve 10 and coal gas of high temperature outlet trip valve 11, open and burn producer gas entrance trip valve 14 and exhanst gas outlet trip valve 20, flue gas residual in stove is driven in flue 21, then change stove and proceed to main combustion period, burn the closedown of producer gas entrance trip valve 14 and exhanst gas outlet trip valve 20 or time-delay closing to measure (measuring CO concentration) by oxygen determination instrument that flue arm is arranged and gas composition and control.
Claims (1)
1. adopt two pre-heating means of heat accumulating type preheating oven preheating blast furnace gas, it is characterized in that, adopt two pre-heating means of heat accumulating type preheating oven preheating blast furnace gas, adopt heat accumulating type preheating oven that part blast furnace gas is preheated to 1000 DEG C-1200 DEG C, coal gas of high temperature after preheating mixes with the low temperature coal gas of 40-80 DEG C, and mixed gas temperature controls at 300 DEG C-350 DEG C wind furnaces that reduce phlegm and internal heat; Combustion air is preheated to 200 DEG C-230 DEG C wind furnaces that reduce phlegm and internal heat, under single fire blast furnace gas condition, just can realize the blast furnace blast temperature being not less than 1250 DEG C like this, its concrete operation step is as follows simultaneously:
1) when heat accumulating type preheating oven is in main combustion period, low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve are closed, combustion air inlet trip valve, burning producer gas entrance trip valve and exhanst gas outlet trip valve are opened, combustion air and coal gas enter burner and fully mix and enter combustion chambers burn again, the high-temperature flue gas produced enters regenerator and checker brickwork is heated to more than 1200 DEG C, and the low-temperature flue gas after heat exchange discharges through exhanst gas outlet;
2) when heat accumulating type preheating oven by main combustion period to when on air changing stove, reduce combustion air inlet control valve opening in advance, reduce coefficient of excess air, in control stove, in residual flue gas, oxygen level is lower than safe concentration, and the temperature according to exhanst gas outlet determines cold stoking or changes stove;
3) when heat accumulating type preheating oven is on air, open low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve, close combustion air inlet trip valve, burn producer gas entrance trip valve and exhanst gas outlet trip valve, the low temperature coal gas of part 40-80 DEG C enters by below regenerator, the coal gas of high temperature of 1000 DEG C-1200 DEG C is heated to when checker brickwork, coal gas of high temperature enters mixing section through pipeline, and the heating gas being mixed into 300 DEG C-350 DEG C with 40-80 DEG C of low temperature coal gas gives blast funnace hot blast stove;
4) when heat accumulating type preheating oven is by when on air changing stove to main combustion period, now introduce flue gas and coal gas of high temperature residual in stove is driven the recovery realizing residual coal gas to high temperature gas line, open flue gas blower fan, exhanst gas outlet trip valve and coal gas of high temperature outlet trip valve, close combustion air inlet trip valve and low temperature coal gas entrance trip valve, flue gas is forced to pass into from exhanst gas outlet by flue gas blower fan, the coal gas of high temperature remained in stove is driven in high temperature gas line, when in stove, gas composition is less than 1-2%, heat accumulating type preheating oven proceeds to main combustion period, repeating step 1);
When heat accumulating type preheating oven by main combustion period to when on air changing stove, for preventing gas explosion and ensureing gas quality not by the impact of flue gas, flue gas is driven in flue with burning producer gas, namely combustion air inlet trip valve is closed, low temperature coal gas entrance trip valve and coal gas of high temperature outlet trip valve, open and burn producer gas entrance trip valve and exhanst gas outlet trip valve, flue gas residual in stove is driven in flue, then change stove and proceed to main combustion period, burn the closedown of producer gas entrance trip valve and exhanst gas outlet trip valve or time-delay closing to be controlled by oxygen determination instrument that flue is arranged and gas composition measurement,
Realize the device of two pre-heating means of described heat accumulating type preheating oven preheating blast furnace gas, the coal gas of high temperature outlet of heat accumulating type preheating oven is connected with the coal gas of high temperature entrance of mixing section by coal gas of high temperature pipeline, the low temperature coal gas entrance of mixing section is connected with low temperature coal gas pipeline, and the mixed gas outlet of mixing section connects hotblast stove; The smoke inlet of air heat exchanger is connected with hotblast stove flue collector respectively with outlet, and the hot air outlet of air heat exchanger connects hotblast stove;
The combustion air inlet of described heat accumulating type preheating oven is connected with combustion air variable valve with combustion air inlet trip valve successively, the burning gas entry of heat accumulating type preheating oven, successively with burning producer gas entrance trip valve with burns producer gas inlet adjustment valve and be connected, is respectively equipped with mechanical chain formula diffusion valve one and diffusion valve two between combustion air inlet trip valve and combustion air variable valve and between burning producer gas entrance trip valve and burning producer gas inlet adjustment valve.
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| CN106011354A (en) * | 2016-08-02 | 2016-10-12 | 芜湖新兴铸管有限责任公司 | Combustion air main pipe for blast-furnace hot blast stove |
| CN106967861B (en) * | 2017-05-26 | 2022-05-27 | 中冶京诚工程技术有限公司 | Time-sharing preheating system for combustion air of hot blast stove |
| CN107227382A (en) * | 2017-07-31 | 2017-10-03 | 中冶京诚工程技术有限公司 | Hot blast stove system of blast furnace |
| CN108330272A (en) * | 2018-01-19 | 2018-07-27 | 山东钢铁集团日照有限公司 | A kind of single Regeneratiue billet reheating furnace using blast furnace gas |
| CN111321263A (en) * | 2018-12-15 | 2020-06-23 | 阜新达诚科技有限公司 | Blast furnace raw gas heating method and device |
| CN112063783B (en) * | 2020-09-09 | 2022-05-20 | 鞍钢股份有限公司 | Blast furnace comprehensive blast method |
| CN112985081A (en) * | 2021-02-04 | 2021-06-18 | 山东祥桓环境科技有限公司 | High-temperature regenerative gas heating device and process |
| CN114777334B (en) * | 2022-05-25 | 2024-05-07 | 中冶赛迪工程技术股份有限公司 | Combined gas heating system and heating method |
| CN115094173B (en) * | 2022-06-27 | 2024-01-12 | 新疆八一钢铁股份有限公司 | Method for heating coal gas by hydrogen-rich carbon circulating blast furnace |
| CN115751318A (en) * | 2022-11-28 | 2023-03-07 | 中钢设备有限公司 | Gas heating device and method |
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| CN1600868A (en) * | 2004-10-10 | 2005-03-30 | 北京科技大学 | Warm up method of combustion supporting air through coal gas from blast furnace hot blast stove in high temperature |
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| CN1600868A (en) * | 2004-10-10 | 2005-03-30 | 北京科技大学 | Warm up method of combustion supporting air through coal gas from blast furnace hot blast stove in high temperature |
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