CN1084792C - High air-temperature high furnace space gas preheating method - Google Patents
High air-temperature high furnace space gas preheating method Download PDFInfo
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- CN1084792C CN1084792C CN99107806A CN99107806A CN1084792C CN 1084792 C CN1084792 C CN 1084792C CN 99107806 A CN99107806 A CN 99107806A CN 99107806 A CN99107806 A CN 99107806A CN 1084792 C CN1084792 C CN 1084792C
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Abstract
The present invention relates to a high air temperature high furnace space coal gas preheating method. By using a hot air furnace smoke gas at a temperature of 280 to 320 DEG C, hot air furnace combustion air and a high furnace coal gas are simultaneously preheated to 130 to 150 DEG C for the first time. The high furnace coal gas is combusted by a smoke gas generating furnace. When the high temperature smoke gas at a temperature of 900 to 1000 DEG C is generated, air and a high furnace coal gas are heated to 300 to 450 DEG C by the smoke gas generating furnace for the second time. The present invention makes full use of the residual heat of a hot air furnace smoke gas to respectively increase the preheating temperature of combustion air and the preheating temperature of the high furnace gas by 50 DEG C and 150 DEG C. Under the condition of completely burning the high furnace gas, air supply temperature reaches 1250 to 1310 DEG C. The present invention has the advantages of coke furnace coal gas or coke saving, power consumption saving and production cost reduction.
Description
The present invention relates to a kind of blast furnace iron-making method, the pre-heating mean of particularly a kind of blast funnace hot blast stove combustion air, coal gas.
At present, along with the blast furnace technology development of (comprising the coal powder injection technology), blast furnace requires hot blast temperature more and more higher (more than 1200 ℃).In order to reach high wind-warm syndrome, the hotblast stove of blast furnace also must be mixed the high heating value coke-oven gas that burns significant proportion except that the blast furnace gas of lower heat of combustion.For most of Steel Plant, coke-oven gas is all most valuable.Since the eighties, many high-air temp hot-blast stove for blast furnace adopt flue gas waste heat recovery apparatus that its blast furnace gas that uses and combustion air are preheating to 130～150 ℃, have received the effect of saving 30% left and right sides coke-oven gas.But also must use the high heating value gas (coke-oven gas) about 70%.In order to make full use of blast furnace gas, prior art adopts high-temperature flue gas that the roasting kiln of burning blast furnace gas produces to blast furnace gas usually, combustion air carries out the method for preheating, Chinese patent application CN1188808A " a kind of blast-furnace hot-air producer gas; the processing method of the two preheatings of combustion air " for example, disclose following technical scheme: the high-temperature flue gas (about 1000 ℃) of utilization burning blast furnace gas mixes a large amount of hotblast stove low-temperature flue gas (250 ℃) and drops to below 600 ℃, blast furnace gas that the reheat hotblast stove uses and combustion air, make its temperature reach about 300 ℃, thereby guarantee that under the condition of fully burning blast-furnace gas wind pushing temperature reaches 1100～1200 ℃.The problem that this scheme exists has: (1) mixes a large amount of low-temperature flue gas with the high-temperature flue gas (900～1000 ℃) that flue gas producer burning blast furnace gas produces, cool to below 600 ℃ and be used again, be an entropy increasing process like this from high temperature to low temperature, i.e. the minimizing process of " usefulness ", i.e. the waste process of energy.In addition, if flue gas just begins to utilize the heating combustion air in the time of 900～1000 ℃, then in interchanger, log-mean temperature difference is just much larger than reducing to the log-mean temperature difference of utilizing its heat exchange below 600 ℃ again, the former heat-transfer effect is much better, and when transmitting identical heat, the former heat transfer area is few, heat exchanger volume is little, and is in light weight.(2) low-temperature flue gas is Duoed more than one times than high-temperature flue gas, must use blower fan to boost or take out and just can mix high-temperature flue gas after drawing, when its when interchanger is reduced to low-temperature flue gas, drawn back by induced draft fan again and send into high-temperature flue gas, this part flue gas is circulation again and again like this, makes a large amount of electric energy of induced draft fan consumption in vain.Hot-blast stove fume more than (3) 250 ℃ does not add utilization and just enters chimney, and residual heat resources fail to make full use of.
The objective of the invention is to make full use of the blast-furnace hot-air furnace flue gas exhaust heat, improve blast furnace gas and the combustion air temperature of advancing Combustion of Hot Air Furnace, guarantee under the condition of fully burning blast-furnace gas, to make the hotblast stove wind pushing temperature further to improve.
For achieving the above object, the technical solution of the present invention's proposition is:
A kind of high-air temp hot-blast stove for blast furnace air, gas preheating method, with hot-blast stove fume hotblast stove combustion air, blast furnace gas are carried out the preheating first time, flue gas producer burning blast furnace gas, the high-temperature flue gas of generation carries out the preheating second time to blast furnace gas, air.
Preheating for the first time is simultaneously combustion air, blast furnace gas to be carried out preheating.
Preheating for the first time is to be that 280～320 ℃ hot-blast stove fume is heated to 130～150 ℃ with combustion air, blast furnace gas by normal temperature with temperature.
Preheating for the first time is to adopt the separate heat pipe interchanger.
Preheating for the second time is successively combustion air, coal gas to be carried out preheating.
Preheating for the second time is earlier combustion air to be heated to 400～450 ℃ by 900～1000 ℃ high-temperature flue gas, again with blast furnace (BF) gas heating to 300～350 ℃.
Preheating for the second time is to use single tube type hot tube heat exchanger.
Fig. 1 is the flow sheet of high-air temp hot-blast stove for blast furnace air of the present invention, gas preheating method.
Below in conjunction with Figure of description the present invention is done and to be described in further detail.
Key of the present invention is: the low-temperature flue gas residual heat resources that (1) hotblast stove is discharged all make them be raised to 130～150 ℃ by normal temperature as the thermal source of first step preheating blast furnace gas and combustion air.(2) the about 900 ℃ of thermals source as second stage preheating blast furnace gas and combustion air of the high-temperature flue gas that utilizes blast furnace gas to generate in the flue gas producer make these two kinds of gases continue to be warmed up to 350～450 ℃ in interchanger.
As shown in Figure 1, the present invention has adopted the two-stage preheating, the pre-thermal recovery separate heat pipe of first step interchanger, it is made up of three interchanger, flue gas heat exchange device 2 wherein is arranged in hotblast stove 8 and leads on the flue Y of chimney 1, air heat exchanger 4 is arranged on hotblast stove 8 original combustion air pipeline K, and gas change heater 3 is arranged on the original blast furnace gas pipeline M of hotblast stove.About 300 ℃ the flue gas that hotblast stove is discharged imports flue gas heat exchange device 2 by main flue Y, working medium in the core pipe of this interchanger absorbs flue gas heat and is vaporized into steam, steam enters respectively along many rows upcast in the core pipe of air heat exchanger 4 in parallel and gas change heater 3, respectively the combustion air of heating tube outside normal temperature and blast furnace gas to 130～150 ℃.Devaporation after the heat release is that liquid flows back to participation circulation next time in the flue gas heat exchange device 2 core pipes along downtake.
One the tunnel not the blast furnace gas of preheating send into flue gas producer 5, obtain about 900 ℃ high-temperature flue gas through burning, flue gas producer 5 and gas blower 9 outlet access tubes join.High-temperature flue gas is introduced into many heat pipe evaporation ends of flue gas/air heat exchanger 6 lower boxes heating, and then imports many heat pipe evaporation ends of flue gas/gas change heater 7 lower boxes heating.The evaporation ends (fume side) that is these two hot tube heat exchanger is series connection, and condensation end (air side and coal gas side) is in parallel.
Two single tube types of the pre-thermal recovery in second stage hot tube heat exchanger, the evaporation side of single tube type hot tube heat exchanger is that fume side is a lower box, both fume side of flue gas/air heat exchanger 6 and flue gas/gas change heater 7 are arranged in series.The preheating first time is reached the flue gas/air heat exchanger 6 that 130～150 ℃ combustion air and blast furnace gas send into second stage preheating respectively and the upper box of flue gas/gas change heater 7, the i.e. condensation side of two single tube type hot tube heat exchanger, two kinds of gases are respectively by many heat pipe heating, the high-temperature flue gas (about 900 ℃) that flue gas producer 5 burning blast furnace gases produce is introduced into flue gas/air heat exchanger 6, combustion air is heated to 400～450 ℃, flue gas is reduced to about 550 ℃, enter flue gas/gas change heater 7 again through flue Y, blast furnace (BF) gas heating to 300～350 ℃, flue gas is reduced to 180 ℃, through by-pass flue, main flue and chimney 1 enter atmosphere.The blast furnace gas of 400～450 ℃ combustion air and 300～350 ℃ enters hotblast stove 8 combustion chambers respectively and participates in burning, can burn dome temperature more than 1450 ℃, guarantees that wind pushing temperature reaches 1250～1310 ℃.
(CN1188808A) compares with prior art, and the present invention has utilized blast furnace heat fully The fume afterheat resource of wind furnace can be preheating to 400～450 ℃ to combustion-supporting air, blast furnace Gas preheating to 300～350 ℃ have been improved respectively 50 ℃ and 150 ℃, thereby have been made high wind-warm syndrome The blast-furnace hot-air stove is in the situation of fully burning blast-furnace gas, and the hot-blast stove wind pushing temperature has improved 50 ℃～110 ℃, reach 1250～1310 ℃. The blast furnace ironmaking processes can be saved (every ton in coke Iron is saved 10～20 kilograms in coke), reduce production costs, facility investment payoff period is 1 year About. And cancelled the more low-temperature flue gas circulation blower fan of power consumption, thereby it is (right to save power consumption 4000 cubic metres of blast furnaces, can save power consumption 180 to spend/hour). As not saving coke, then can (to 4000 cubic metres of blast furnaces, it is vertical to save coke-stove gas 10,000 to save a large amount of coke-stove gas Square m/h).
Claims (7)
1. a high-air temp hot-blast stove for blast furnace air, gas preheating method, it is characterized in that: hotblast stove combustion air, blast furnace gas are carried out the preheating first time with hot-blast stove fume, flue gas producer burning blast furnace gas, the high-temperature flue gas of generation carries out the preheating second time to blast furnace gas, air.
2. high-air temp hot-blast stove for blast furnace air according to claim 1, gas preheating method is characterized in that: the described preheating first time is simultaneously combustion air, blast furnace gas to be carried out preheating.
3. high-air temp hot-blast stove for blast furnace air according to claim 2, gas preheating method is characterized in that: the described preheating first time is to be that 280～320 ℃ hot-blast stove fume is heated to 130～150 ℃ with combustion air, blast furnace gas by normal temperature with temperature.
4. high-air temp hot-blast stove for blast furnace air according to claim 3, gas preheating method is characterized in that: the described preheating first time is to adopt the separate heat pipe interchanger.
5. high-air temp hot-blast stove for blast furnace air according to claim 1, gas preheating method is characterized in that: the described preheating second time is successively combustion air, blast furnace gas to be carried out preheating.
6. high-air temp hot-blast stove for blast furnace air according to claim 5, gas preheating method, it is characterized in that: the described preheating second time is earlier combustion air to be heated to 400～450 ℃ by 900～1000 ℃ high-temperature flue gas, again with blast furnace (BF) gas heating to 300～350 ℃.
7. high-air temp hot-blast stove for blast furnace air according to claim 6, gas preheating method is characterized in that: the described preheating second time is to use single tube type hot tube heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99107806A CN1084792C (en) | 1999-05-31 | 1999-05-31 | High air-temperature high furnace space gas preheating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99107806A CN1084792C (en) | 1999-05-31 | 1999-05-31 | High air-temperature high furnace space gas preheating method |
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| Publication Number | Publication Date |
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| CN1237639A CN1237639A (en) | 1999-12-08 |
| CN1084792C true CN1084792C (en) | 2002-05-15 |
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| CN99107806A Expired - Fee Related CN1084792C (en) | 1999-05-31 | 1999-05-31 | High air-temperature high furnace space gas preheating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296495C (en) * | 2004-05-10 | 2007-01-24 | 四川大学 | High wind temperature obtaining method using pure blast furnace gas combustion |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100398668C (en) * | 2005-06-30 | 2008-07-02 | 宝山钢铁股份有限公司 | Technological process and apparatus for heating high concentration CO and other reducing gas |
| CN101650133B (en) * | 2009-09-01 | 2010-12-01 | 北京沃克能源科技有限公司 | Recycling system of smoke gas energy for realizing high-temperature and low-oxygen combustion |
| CN103725818B (en) * | 2013-12-26 | 2015-10-28 | 上海宝钢节能环保技术有限公司 | A kind of hotblast stove low temperature exhaust heat degree of depth recovery system |
| CN107816897B (en) * | 2017-11-02 | 2019-04-23 | 日照明祥铸造股份有限公司 | A kind of energy-saving type iron-smelting furnace preheating device |
| CN114410871B (en) * | 2022-01-21 | 2022-12-06 | 南京华电节能环保股份有限公司 | System for double preheating of coal gas or air of blast furnace hot blast stove by using waste heat of ascending pipe |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2427331A2 (en) * | 1978-05-31 | 1979-12-28 | Wellcome Found | HYDANTOIN DERIVATIVES AND MEDICINAL PRODUCTS CONTAINING SUCH SUBSTANCES |
| US4492568A (en) * | 1982-12-14 | 1985-01-08 | Didier-Werke Ag | Process and apparatus for preheating the combustion mediums used for firing blast furnace stoves |
-
1999
- 1999-05-31 CN CN99107806A patent/CN1084792C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2427331A2 (en) * | 1978-05-31 | 1979-12-28 | Wellcome Found | HYDANTOIN DERIVATIVES AND MEDICINAL PRODUCTS CONTAINING SUCH SUBSTANCES |
| US4492568A (en) * | 1982-12-14 | 1985-01-08 | Didier-Werke Ag | Process and apparatus for preheating the combustion mediums used for firing blast furnace stoves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296495C (en) * | 2004-05-10 | 2007-01-24 | 四川大学 | High wind temperature obtaining method using pure blast furnace gas combustion |
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| CN1237639A (en) | 1999-12-08 |
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Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER OWNER: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD Effective date: 20010921 |
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Effective date of registration: 20010921 Address after: Orchard, Fujin Road, Baoshan District, Shanghai Applicant after: Baoshan Iron & Steel Co., Ltd. Address before: No. 1, middle section, factory road, Shanghai, Baoshan District Applicant before: Baoshan Iron & Steel (Group) Co., Ltd. |
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Granted publication date: 20020515 Termination date: 20130531 |