CN102876824A - Method for guaranteeing high blast temperature by using blast furnace gas - Google Patents
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Abstract
The invention discloses a method for guaranteeing high blast temperature by using blast furnace gas, and belongs to the technical field of utilization of blast furnace gas of iron making and combustion of hot-blast furnaces. The method is particularly suitable for being used under the conditions that high heating value gas is in short, and blast furnace gas is rich. The method aims to solve the problem that high blast temperature cannot be guaranteed due to low heating value of the blast furnace gas, and an additional combustion furnace is adopted to guarantee the high blast temperature, and the blast furnace gas is comprehensively utilized; and the method comprises the steps of: utilizing the residual heat of the blast furnace gas, removing dust by a dry method, and performing pressure swing adsorption and mixing and combusting to guarantee high blast temperature. The residual heat of the blast furnace gas and the residual heat produced after the dust is removed by the dry method are used for heating air from an air blower, and the heated air is used as combustion air for combustion of the hot blast furnace and cold air blast at an inlet of the hot-blast furnace; the low heating value blast furnace gas which is obtained after the dust is removed by the dry method and of which the volume proportion is 10 to 40 percent is cooled to enter a pressure swing adsorption device, so that the low heating value blast furnace gas is changed into the high heating value gas, and the high heating value gas and low heating value blast furnace gas obtained after top pressure power generation is mixed and combusted; and under the condition that a hot-blast furnace system is not provided with the additional combustion furnace, the hot blast at the high temperature of between 1,250 and 1,350 DEG C can be provided for a blast furnace for use.
Description
Technical field
The present invention relates to Iron And Steel Industry iron-smelting blast furnace hotblast stove technical field, particularly a kind of method of efficiently utilizing blast furnace gas to realize high wind-warm syndrome is used in the situation that the high heating value gas shortage only has blast furnace gas to have more than needed.
Background technology
Iron And Steel Industry is that its energy consumption accounts for about 25% of industrial total energy consumption, is the emphasis of industrial energy saving take fossil fuel as main high pollution high energy consumption industry, and taking full advantage of all kinds of Energy resources is the important channels that further reduce the Iron and Steel Production energy consumption.Blast furnace gas is the byproduct of iron and steel enterprise, because its caloric power of gas is low, more or less exists and diffuses, and therefore, how efficiently utilizing blast furnace gas is the problem that numerous iron and steel enterprises are concerned about.
High wind-warm syndrome is the technical characteristics of contemporary advanced blast furnace, the heat that high-temperature hot-air provides accounts for about 20% of the required heat of blast-furnace smelting, the raising wind-warm syndrome can effectively reduce the carbon element consumption of blast furnace ironmaking process, (100 ℃ of the every raisings of wind-warm syndrome of decrease coke ratio, coke consumption reduces by 3%～7%), wherein hotblast stove is the important auxiliary facility of realizing the high wind-warm syndrome of blast furnace.
Burning single blast furnace gas, because its theoretical combustion temperature is low, is the bottleneck of realizing high wind-warm syndrome.For realizing high wind-warm syndrome, the method that adopts both at home and abroad mainly contains to mix burns high heating value gas, interchanger preheating gas and combustion air, hotblast stove self-preheating, high-temperature air burning preheating etc., take to mix the method for burning Sweet natural gas or coke-oven gas such as Japan, Europe, Baosteel has adopted mixes the method for burning coal gas of converter, Anshan iron and steel plant adopts the self-preheating method, aspect fully burning blast-furnace gas, iron and steel enterprise mainly adopts the high-temperature air burning pre-heating mean to realize high wind-warm syndrome.
Aforesaid method includes the high temperature preheating of combustion air in the situation of only using blast furnace gas, efficiently solve fully burning blast-furnace gas and realize high wind-warm syndrome problem.But along with the progress of ironmaking technology in modern age, the blast furnace gas utilization ratio improves constantly, and causes blast furnace gas calorific value constantly to reduce, and for realizing high wind-warm syndrome, has to the combustion air preheating temperature is further improved." experimental study of the high wind-warm syndrome of blast furnace " paper of delivering such as " steel research journal " the 5th phase of 23 volumes in 2011, the inventor and Zhang Jianliang etc. have proposed when realizing moving 1280 ℃ of wind-warm syndrome of No. 2 blast furnaces of steel, the combustion air preheating temperature is greater than 660 ℃, and the blast furnace gas calorific value of its use all is down to 2900kJ/m
3Below, minimum 2620kJ/m that once was down to of blast furnace gas calorific value in 2009 wherein
3About, in the case, for realizing high wind-warm syndrome, the combustion air preheating temperature will be above 700 ℃.
Summary of the invention
The object of the present invention is to provide the method for utilizing blast furnace gas to realize high wind-warm syndrome, solve prior art because blast furnace gas calorific value is low and can't realize high wind-warm syndrome and in order to realize that high wind-warm syndrome needs the problems such as warm-up combustion-supporting air.
In order to address the above problem, the method for utilizing blast furnace gas to realize high wind-warm syndrome provided by the invention comprises blast furnace 17, sack cleaner 3, furnace roof waste pressure turbine device 9, pressure-swing absorption apparatus 31, hotblast stove, gas change heater 25, gas blower 16 and gas chamber 10, wherein, hotblast stove comprises hotblast stove A18, hotblast stove B20 and hotblast stove C22, present method comprises that also utilization, dry method dust, pressure-variable adsorption, blending and the burning of blast furnace gas waste heat realize high wind-warm syndrome process, may further comprise the steps simultaneously:
At first, juxtaposition hot tube heat exchanger 2 between blast furnace 17 and sack cleaner 3, with temperature be 300～900 ℃ from the blast furnace gas of blast furnace 17 first through hot tube heat exchanger 2 heat exchange, enter again sack cleaner 3 and carry out dry method dust; Temperature is lower than 300 ℃ directly entering sack cleaner 3 from the blast furnace gas of blast furnace 17 through coal gas supervisor 46 and carry out dry method dust;
Secondly, be that 10%～40% blast furnace gas is after cryogenic heat exchanger 5 coolings with volume ratio behind the described dry method dust, enter pressure-swing absorption apparatus 31, change high heating value gas into, remaining enters described gas chamber 10 through blast furnace gas being arranged behind the described dry method dust behind described furnace roof waste pressure turbine device 9;
At last, with the high heating value gas behind the described pressure-variable adsorption and blast furnace gas mixing formation mixed gas from described gas chamber 10, then through the flue gas of described hotblast stove carries out preheating in described gas change heater 25 after, be blended in described Combustion of Hot Air Furnace with combustion air, at hotblast stove on air, be that 1250～1350 ℃ of high-temperature hot-airs are for blast furnace 17 with cold air heating.
Further, described pressure-swing absorption apparatus 31 comprises pressure-variable adsorption tank A28 and pressure-variable adsorption tank B35, and present method also comprises: from the blast furnace gas of described blast furnace 17, its calorific value is 2500～3300kJ/m
3Enter the blast furnace gas of described pressure-swing absorption apparatus 31, wherein volume ratio is 40%～80% blast furnace gas through boost respectively absorption and vacuumize cleaning process of described pressure-variable adsorption tank A28 and pressure-variable adsorption tank B35, discharges CO
2And N
2, the volume ratio that extracts CO is 80%～90%, with the blast furnace gas blending of remainder be high heating value gas.
Further, the CO volume ratio of described high heating value gas is 40%～80%, and the CO volume ratio of described mixed gas is 35%～45%, and its calorific value is 4500～5500kJ/m
3
Further, the temperature of described mixed gas after the flue gas of described hotblast stove carries out preheating is 150～250 ℃; After cryogenic heat exchanger 5 and hot tube heat exchanger 2 preheatings, its temperature is 50～200 ℃ from the air of described gas blower 16, at the main combustion period of described hotblast stove as combustion air, described hotblast stove on air as cold wind.
The blast furnace gas method of efficiently utilizing provided by the invention, for the low problem of its former blast furnace gas calorific value, use cloth bag pulse dry dedusting technology and remove the moisture and dust-laden of former blast furnace gas, improve its gas quality, the preliminary caloric power of gas that improves, the method of using pressure-variable adsorption increases CO concentration in the blast furnace gas, in conjunction with blending technique blast furnace gas calorific value is increased to rated range, need not in the combustion air preheating situation, satisfy the Combustion of Hot Air Furnace blast furnace gas and realize high wind-warm syndrome, utilize simultaneously blast-furnace top gas recovery more than needed to realize furnace roof top pressure power generation, thereby realize the high efficiency utilization of blast furnace gas.
Description of drawings
Fig. 1 is the FB(flow block) of utilizing the embodiment of the method that blast furnace gas realizes high wind-warm syndrome provided by the invention;
Fig. 2 is that the layout of the embodiment of the method that blast furnace gas realizes high wind-warm syndrome of utilizing provided by the invention is always schemed;
Reference numeral:
Among the figure, 1, branch gas tube A variable valve, 2, hot tube heat exchanger, 3, sack cleaner, 4, air cutoff valve, 5, cryogenic heat exchanger, 6, branch gas tube B variable valve, 7, coal gas supervisor B trip valve, 8, the reducing valve group, 9, furnace roof waste pressure turbine device, 10, gas chamber, 11, air control valve, 12, coal gas supervisor A trip valve, 13, hot blast valve A, 14, hot blast valve B, 15, hot blast valve C, 16, gas blower, 17, blast furnace, 18, hotblast stove A, 19, gas valve A, 20, hotblast stove B, 21, gas valve B, 22, hotblast stove C, 23, gas valve C, 24, smoke valve, 25, the hotblast stove gas change heater, 26, chimney, 27, branch gas tube C variable valve, 28, pressure-variable adsorption tank A, 29, lower coal gas variable pressure valve A, 30, generator, 31, pressure-swing absorption apparatus, 32, upper coal gas variable pressure valve A, 33, gas supply pipe variable valve, 34, upper coal gas variable pressure valve B, 35, pressure-variable adsorption tank B, 36, lower coal gas variable pressure valve B.
Embodiment
The embodiment that utilizes blast furnace gas to realize the method for high wind-warm syndrome provided by the invention, shown in Fig. 1～2, blast furnace gas from blast furnace 17, when its temperature is lower than 300 ℃, blast furnace gas enters sack cleaner 3 dry method dusts through coal gas supervisor A trip valve 12 first, when the temperature of blast furnace gas is 300～900 ℃, be introduced into hot tube heat exchanger 2 heat exchange cooling through branch gas tube A variable valve 1, then enter sack cleaner 3 dry method dusts;
Behind dry method dust, volume ratio is that 10%～40% blast furnace gas enters pressure-swing absorption apparatus 31 through branch gas tube B variable valve 6 and cryogenic heat exchanger 5, enter the blast furnace gas behind the pressure-swing absorption apparatus 31, wherein volume ratio is that 40%～80% blast furnace gas enters pressure-variable adsorption tank A28 and enters pressure-variable adsorption tank B35 through upper coal gas variable pressure valve B34 through upper coal gas variable pressure valve A32 respectively, CO is discharged in boost respectively absorption and vacuumize cleaning process
2And N
2, the volume ratio that extracts CO is 80%～90%, is that the CO volume ratio is 40%～80% high heating value gas through lower coal gas variable pressure valve A29 and lower coal gas variable pressure valve B36 with blast furnace gas blending through branch gas tube C variable valve 27 remainders respectively then;
Behind dry method dust, all the other do not enter the blast furnace gas of pressure-swing absorption apparatus 31 through coal gas supervisor's B trip valve 7 and reducing valve group 8, enter furnace roof waste pressure turbine device 9, drive generator 30 generatings, then enter gas chamber 10, mix again forming mixed gas with above-mentioned high heating value gas through gas supply pipe variable valve 33, and together after 25 preheatings of hotblast stove gas change heater temperature be 150～250 ℃, then enter successively hotblast stove A18, hotblast stove B20 and hotblast stove C22;
From the air of gas blower 16 behind cryogenic heat exchanger 5 recovery waste heats, through air cutoff valve 4 and hot tube heat exchanger 2, be heated and become 50～200 ℃ air, then as combustion air, enter successively hotblast stove A18 through air control valve 11, hotblast stove B20 and hotblast stove C22, with through 25 preheatings of hotblast stove gas change heater by gas valve A19, the mixed gas of gas valve B21 or gas valve C23 is blended in the hotblast stove internal combustion, flue gas is through smoke valve 24 and hotblast stove gas change heater 25 after the Combustion of Hot Air Furnace, discharge through chimney 26, at hotblast stove on air, 50～200 ℃ air as cold wind successively at hotblast stove A18, add 1250～1350 ℃ of high-temperature hot-airs of thermogenesis in hotblast stove B20 and the hotblast stove C22 through hot blast valve A13, hot blast valve B14 or hot blast valve C15 are for blast furnace 17, and it is as shown in table 1 that the blast furnace gas parameter of case study on implementation changes contrast.
Table 1 blast furnace gas parameter changes contrast
The method of utilizing blast furnace gas to realize high wind-warm syndrome provided by the invention has following advantage:
1, can only use blast furnace gas, and in the low situation of combustion air preheating temperature, realize high wind-warm syndrome
Former technical process is being used in the Experience of Using Single Bf Gas situation, because its calorific value is low, cause theoretical combustion temperature to hang down and to realize high wind-warm syndrome, so must carry out high temperature preheating to blast furnace gas by the additional combustion stove, such as realizing 1250～1350 ℃ of wind-warm syndrome, generally need 600～800 ℃ of warm-up combustion-supporting airs, and the combustion air temperature of technical scheme preheating of the present invention is lower than 200 ℃, only realize self-preheating by hot tube heat exchanger, need not additional combustion stove warm-up combustion-supporting air.
2, blast furnace gas utilizes cost low
High heating value gas with blending, such as coke-oven gas and Sweet natural gas etc. relatively, use single blast furnace gas cost low, 0.6 yuan of coke-oven gas gas price, 1.9 yuan of Gas Prices, and the blast furnace gas price only is 0.03～0.07 yuan, though through the departmental cost of pressure-variable adsorption increase is arranged, but blast furnace gas is processed and the proportion structure of blending because technical scheme of the present invention is optimized, so the cost of comparing still is lower than the method that the high heating value gas of blending is realized high wind-warm syndrome.
3, take full advantage of the blast furnace gas waste heat, improve efficiency
The cold wind of hotblast stove of the present invention and combustion air all utilize the air of coal gas waste heat preheating from cryogenic heat exchanger and hot tube heat exchanger, take full advantage of residual heat and energy, not only do not increase energy consumption, improve on the contrary efficiency.
4, optimization technological process and system energy consumption
In pressure-swing adsorption process, adopt the pressure of the front blast furnace gas of top pressure power generation to realize boosting, reduce the energy consumption of boosting, by high heating value gas and blast furnace gas ratio behind the reasonable blending pressure-variable adsorption, the optimization of feasible system energy consumption.
5, guarantee the equipment work condition, maintenance cost is low, long service life
Hot tube heat exchanger is arranged side by side between blast furnace and sack cleaner pipeline, can effectively avoid the cloth bag in the high temperature blast furnace raw gas scaling loss sack cleaner, thereby guaranteed the sack cleaner operating temperature range, thereby reduced cost of equipment maintenance, and prolonged its work-ing life.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. utilize blast furnace gas to realize the method for high wind-warm syndrome, comprise blast furnace (17), sack cleaner (3), furnace roof waste pressure turbine device (9), pressure-swing absorption apparatus (31), hotblast stove, gas change heater (25), gas blower (16) and gas chamber (10), wherein, hotblast stove comprises hotblast stove A(18), hotblast stove B(20) and hotblast stove C(22), it is characterized in that, the utilization, dry method dust, pressure-variable adsorption, blending and the burning that comprise the blast furnace gas waste heat realize high wind-warm syndrome process, may further comprise the steps:
At first, juxtaposition hot tube heat exchanger (2) between described blast furnace (17) and described sack cleaner (3), with temperature be 300～900 ℃ from the blast furnace gas of described blast furnace (17) first through described hot tube heat exchanger (2) heat exchange, enter again described sack cleaner (3) and carry out dry method dust; Temperature is lower than 300 ℃ directly entering described sack cleaner (3) from the blast furnace gas of described blast furnace (17) through coal gas supervisor (46) and carry out dry method dust;
Secondly, be that 10%～40% blast furnace gas is after cryogenic heat exchanger (5) cooling with volume ratio behind the described dry method dust, enter described pressure-swing absorption apparatus (31), change high heating value gas into, remaining behind described furnace roof waste pressure turbine device (9), enters described gas chamber (10) through the blast furnace gas behind the described dry method dust;
At last, with the high heating value gas behind the described pressure-variable adsorption and blast furnace gas mixing formation mixed gas from described gas chamber (10), then through the flue gas of described hotblast stove carries out preheating in described gas change heater (25) after, be blended in described Combustion of Hot Air Furnace with combustion air, at hotblast stove on air, be that 1250～1350 ℃ of high-temperature hot-airs are for blast furnace (17) with cold air heating.
2. the method for utilizing blast furnace gas to realize high wind-warm syndrome according to claim 1, described pressure-swing absorption apparatus (31) comprises pressure-variable adsorption tank A(28) and pressure-variable adsorption tank B(35), it is characterized in that from the blast furnace gas of described blast furnace (17), its calorific value is 2500～3300kJ/m
3Enter the blast furnace gas of described pressure-swing absorption apparatus (31), wherein volume ratio is that 40%～80% blast furnace gas is through described pressure-variable adsorption tank A(28) and pressure-variable adsorption tank B(35) absorption and vacuumize cleaning process of boosting respectively, discharge CO
2And N
2, the volume ratio that extracts CO is 80%～90%, with the blast furnace gas blending of remainder be high heating value gas.
3. the method for utilizing blast furnace gas to realize high wind-warm syndrome according to claim 1 and 2, it is characterized in that, the CO volume ratio of described high heating value gas is 40%～80%, and the CO volume ratio of described mixed gas is 35%～45%, and its calorific value is 4500～5500kJ/m
3
4. the method for utilizing blast furnace gas to realize high wind-warm syndrome according to claim 3 is characterized in that, the temperature of described mixed gas after the flue gas of described hotblast stove carries out preheating is 150～250 ℃; After described cryogenic heat exchanger (5) and described hot tube heat exchanger (2) preheating, its temperature is 50～200 ℃ from the air of described gas blower (16), at the main combustion period of described hotblast stove as combustion air, described hotblast stove on air as cold wind.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451340A (en) * | 2013-08-23 | 2013-12-18 | 首钢总公司 | Device and method thereof for increasing air temperature of hot blast furnace by utilizing air voltage transformation to adsorb oxygen enrichment |
| CN103740873A (en) * | 2014-01-27 | 2014-04-23 | 中冶东方工程技术有限公司 | Blast furnace ironmaking system |
| CN104152185A (en) * | 2014-08-20 | 2014-11-19 | 衡阳华菱钢管有限公司 | Method for transformation, adsorption and purification of blast furnace gas and its system thereof |
| EP2886666A1 (en) * | 2013-12-20 | 2015-06-24 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for operating a top gas recycling blast furnace installation |
| CN104930865A (en) * | 2015-06-05 | 2015-09-23 | 浙江大学 | Energy-saving blast furnace system utilizing waste heat and excessive pressure to supply oxygen-enriched air itself |
| CN111174423A (en) * | 2020-02-05 | 2020-05-19 | 鞍钢集团工程技术有限公司 | High-temperature oxygen-enriched heating furnace for extracting vanadium and titanium from vanadium-titanium slag and operation method thereof |
| CN113046504A (en) * | 2021-03-18 | 2021-06-29 | 东北大学 | Blast furnace production system utilizing waste heat, residual pressure and residual cooling |
| RU2770105C2 (en) * | 2017-07-03 | 2022-04-14 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Method for operating plant for cast iron or steel production |
| RU2790713C1 (en) * | 2022-09-01 | 2023-02-28 | Общество с ограниченной ответственностью "Профит" | Method for producing cast iron from iron ore sludge |
| CN116287533A (en) * | 2023-05-25 | 2023-06-23 | 南京恒瑞环保科技有限公司 | Flue gas purification system for evaporative cooler in converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451340A (en) * | 2013-08-23 | 2013-12-18 | 首钢总公司 | Device and method thereof for increasing air temperature of hot blast furnace by utilizing air voltage transformation to adsorb oxygen enrichment |
| US10072312B2 (en) | 2013-12-20 | 2018-09-11 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for operating a top gas recycling blast furnace installation |
| EP2886666A1 (en) * | 2013-12-20 | 2015-06-24 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for operating a top gas recycling blast furnace installation |
| WO2015090900A1 (en) * | 2013-12-20 | 2015-06-25 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for operating a top gas recycling blast furnace installation |
| CN103740873B (en) * | 2014-01-27 | 2015-12-02 | 中冶东方工程技术有限公司 | A kind of system for blast furnace ironmaking |
| CN103740873A (en) * | 2014-01-27 | 2014-04-23 | 中冶东方工程技术有限公司 | Blast furnace ironmaking system |
| CN104152185B (en) * | 2014-08-20 | 2016-03-09 | 衡阳华菱钢管有限公司 | The method of Pressure Swing Adsorption blast furnace gas and system thereof |
| CN104152185A (en) * | 2014-08-20 | 2014-11-19 | 衡阳华菱钢管有限公司 | Method for transformation, adsorption and purification of blast furnace gas and its system thereof |
| CN104930865A (en) * | 2015-06-05 | 2015-09-23 | 浙江大学 | Energy-saving blast furnace system utilizing waste heat and excessive pressure to supply oxygen-enriched air itself |
| RU2770105C2 (en) * | 2017-07-03 | 2022-04-14 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Method for operating plant for cast iron or steel production |
| US11377700B2 (en) | 2017-07-03 | 2022-07-05 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method for operating an iron- or steelmaking- plant |
| CN111174423A (en) * | 2020-02-05 | 2020-05-19 | 鞍钢集团工程技术有限公司 | High-temperature oxygen-enriched heating furnace for extracting vanadium and titanium from vanadium-titanium slag and operation method thereof |
| CN113046504A (en) * | 2021-03-18 | 2021-06-29 | 东北大学 | Blast furnace production system utilizing waste heat, residual pressure and residual cooling |
| CN113046504B (en) * | 2021-03-18 | 2022-06-21 | 东北大学 | Blast furnace production system utilizing waste heat, residual pressure and residual cooling |
| RU2790713C1 (en) * | 2022-09-01 | 2023-02-28 | Общество с ограниченной ответственностью "Профит" | Method for producing cast iron from iron ore sludge |
| CN116287533A (en) * | 2023-05-25 | 2023-06-23 | 南京恒瑞环保科技有限公司 | Flue gas purification system for evaporative cooler in converter |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |