CN103509904A - Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove - Google Patents
Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove Download PDFInfo
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- CN103509904A CN103509904A CN201210220640.4A CN201210220640A CN103509904A CN 103509904 A CN103509904 A CN 103509904A CN 201210220640 A CN201210220640 A CN 201210220640A CN 103509904 A CN103509904 A CN 103509904A
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Abstract
The invention relates to a waste gas pressurizing device for a blast-furnace hot blast stove. The waste gas pressurizing device comprises a stove body, wherein one end of the stove body is connected with a blast main pipe, a waste gas main pipe and a flue gas main pipe, the other end of the stove body is connected with an air main pipe, a gas main pipe, and a hot-blast main pipe leading to the blast stove, the blast main pipe is provided with a cold blast valve, the blast main pipe is also provided with an inflation valve parallel to the cold blast valve, the hot-blast main pipe is provided with a hot blast valve, the flue gas main pipe is provided with a chimney valve, the waste gas main pipe is provided with a waste gas valve, the gas main pipe is provided with a gas cut-off valve and a gas combustion valve, and the air main pipe is provided with an air cut-off valve. The device is characterized in that the waste gas main pipe is also provided with a waste gas main pipe cut-off valve. The device disclosed by the invention is simple in structure, low in cost and easy to operate; secondly, the method can obviously shorten the pressurizing time, and the pressurizing time directly affects the fluctuation of pressure in a blast furnace; in the process, pressurizing is performed by using waste gas, which generally can save 4 minutes of pressurizing time.
Description
Technical field
The present invention relates to a kind of waste gas pressurizing device and pressurising method, particularly relate to a kind of blast-furnace hot-air furnace exhaust pressurizing device and pressurising method, mainly to realize hot blast stove system in changing stove process, utilize exhaust gas valve and waste gas header the hotblast stove that will blow to be carried out to the method for pressurising, belong to hotblast stove control field.
Background technology
In the prior art, large blast-furnace hot-air furnace system substantially all adopts all the people present's hotblast stove, the form of two hotblast stove air-supplies in parallel, i.e. two hotblast stove parallel connections are blown to blast furnace, when to set change fire bars part time, by prior setting, change stove order, enabling next hotblast stove blows, after this hotblast stove has been blown, to close follow procedure in two hotblast stoves of blowing above and set hotblast stove that need to be out-of-blast, this hotblast stove burns stove state
.at this, change in stove process, because blast furnace blowing engine air-supply air quantity is certain, so be subject to three pressure balanced relations of blast furnace in changing stove process, cause a part of air quantity can not enter in blast furnace, be equivalent to original all air outputs and all enter high furnace interior, present a part of air quantity is admitted to the hotblast stove of preparing to blow and has carried out pressure equilibrium, this result is similar to blast furnace, and in normal productive process, checking is once, such situation is very unfavorable to the smelting of blast furnace, secondly easily cause the pressure of blast furnace system to produce fluctuation, the loss that hot blast air quantity is a large amount of, therefore, a kind of method of exigence solves above-mentioned technical problem.
Summary of the invention
The present invention provides a kind of blast-furnace hot-air furnace exhaust pressurizing device and pressurising method for the technical problem existing in prior art just, and the method can realize blast furnace in changing stove process, and the air output loss of blast furnace is reduced as much as possible.
In order to solve the problems of the technologies described above, the invention provides a kind of blast-furnace hot-air furnace exhaust pressurizing device and method, this pressurising method can guarantee in Plenum Process, the wind loss of sending in blast furnace drops to minimum.Technical scheme of the present invention is, a kind of blast-furnace hot-air furnace exhaust pressurizing device, comprise body of heater, one end of body of heater connects blast main, waste gas header and flue gas house steward, the other end of body of heater is connected with air main, gas main and the hot-blast main of leading to blast furnace, on described blast main, be provided with cold blast valve, on blast main, be also provided with the inflation valve arranged side by side with cold blast valve, on hot-blast main, be provided with hot blast valve, on described flue gas house steward, be provided with chimney valve, on waste gas header, be provided with exhaust gas valve, on gas main, be provided with gas stop valve and gas-fired valve, on air main, be provided with air cutoff valve, it is characterized in that: on described waste gas header, be also provided with waste gas header trip valve.
As a modification of the present invention, on described waste gas header, be also provided with the waste gas header by-pass valve in parallel with waste gas header trip valve.The effect that two valves are set is to prevent that the valve from breaking down, and another valve can guarantee normally carrying out of production, is normally providing safeguard of producing.
The state of hotblast stove mainly contains three kinds: burning, stewing stove and air-supply.Hotblast stove generally has 9 valves, do not comprise air control valve, gas regulator and other mixed gas trip valves, be respectively: two chimney valves, exhaust gas valve, cold blast valve, equalizer valve, hot blast valve, air cutoff valve, gas-fired valve, gas stop valve, normal ventilation state is: except cold blast valve and hot blast valve are opened, other valves are all closed, be similar to the high pressure air quantity that blast furnace steam turbine is sent and enter hotblast stove by cold blast valve, displace by the high-temperature gas of Combustion of Hot Air Furnace, by hot blast valve, send into blast-furnace body, guarantee the smelting of blast furnace.So-called air-supply in parallel is exactly that two hotblast stoves are simultaneously to blast furnace hot wind supply; So-called burning is exactly to open air cutoff valve, and the trip valve that turns on the gas-fire, is controlling well after flow by variable valve, and the combustion valve that turns on the gas-fire, carries out the mixed firing of air and coal gas.The waste gas of burning enters flue gas house steward by two chimney valves, while transferring burning to from stewing stove state, furnace pressure is very high, and chimney valve diameter is also thick especially, if directly open chimney valve, need very large moment just can open chimney valve, therefore conventionally utilize a smaller exhaust gas valve of diameter that is connected in parallel on chimney valve side first to open, diffuse the pressure in balanced hot-blast stove, when pressure drops to certain set(ting)value, open again chimney valve, be just very easy to.So-called stewing stove be exactly hotblast stove burning complete wait for air-supply before or blown, before will burning, all valves are closed, be exactly to boil in a covered pot over a slow fire stove.
The stove process of changing of changing-over stove, according to two burnings two, send and be all the people present's hotblast stove, realize the form of air-supply in parallel, two hotblast stoves are in air-supply, two hotblast stoves are burning stove, its air-supply process in parallel is generally: No. 1 hotblast stove, No. 2 hotblast stove air-supplies, when changing after fire bars part meets, transfer hotblast stove to No. 2, No. 3 hotblast stove air-supplies, when changing after fire bars part meets, transfer again hotblast stove to No. 3, No. 4 hotblast stove air-supplies, when changing after fire bars part meets, transfer again hotblast stove to No. 4, No. 1 hotblast stove air-supply, when changing after fire bars part meets, transfer again hotblast stove to No. 1, No. 2 hotblast stove air-supplies, automatic cycling operating goes down successively.
No. 1 hotblast stove, No. 2 hotblast stove air-supplies, when changing, after fire bars part meets, to transfer the process of No. 2 hotblast stoves, No. 3 hotblast stove air-supplies to as follows: when meeting while changing fire bars part, first No. 1 hotblast stove is transferred to stewing stove from ventilation state, after No. 1 all valve closess of hotblast stove, the air quantity of now sending from steam turbine is all sent into high furnace interior by No. 2 hotblast stoves, and this process is without any the loss of air quantity, when No. 3 hotblast stoves are prepared to enter ventilation state, there is variation in the air quantity of sending into blast furnace, as a same reason, air-supply will be opened cold blast valve and hot blast valve, because the relation of pressure, before opening cold blast valve, first to be connected in parallel on the other small diameter pipeline inflation valve of cold blast valve by one and carry out pressure equilibrium, after pressure equilibrium, open again large diameter cold blast valve, then directly drive hot blast valve, from the inflation valve of pressure balance function, being opened to hot blast valve opened in this for some time, all that high pressure air blast air quantity is sent into endlessly in No. 3 hotblast stoves and carried out pressure equilibrium, until after hot blast valve opens, the displacement passage of No. 3 corresponding hot blasts of hotblast stove, all air quantity are got back in blast furnace again, whole process of changing stove is for blast furnace, be equivalent to the process that a checking amount is recovered to air quantity.
Method of the present invention is exactly the air quantity demands of No. 3 hotblast stoves of minimizing in pressurising equilibrium process, and in order to reach this object, the method for employing is exactly: utilize No. 1 blast furnace to turn and boil in a covered pot over a slow fire the air quantity of putting aside stove from air-supply, send in No. 3 hotblast stoves, carry out air balance.By traditional control method, when No. 3 hotblast stoves transfer to after air-supply, No. 1 blast furnace proceeds to state of combustion, this is need to open exhaust gas valve the pressure of putting aside in stove is entered to waste gas header to send in atmosphere, and then open respectively chimney valve and pressure lock, gas valve etc., this process has been wasted the internal energy of No. 1 hotblast stove, if opening equalizer valve at No. 3 blast furnaces introduces before the air quantity that steam turbine brings, first carrying out pressure equilibrium with No. 3 hotblast stoves in No. 1 hotblast stove, so just be equivalent at No. 3 hotblast stoves before pressurising, first and No. 1 hotblast stove carries out the equipartition of energy, both reduced the pollution of diffusing of No. 1 hotblast stove, reduced again by No. 3 hotblast stove losses to blast furnace total blast volume in Plenum Process.
The effect making full use of in order to reach balancing energy, on waste gas header, design a waste gas header trip valve, when No. 1, No. 2 hotblast stove air-supplies are changed stove and are turned No. 2, during No. 3 air-supplies, No. 1 hotblast stove transfers stewing stove state to by air-supply, all valves are all closed, at this moment also turn-off and be arranged on the waste gas header trip valve on waste gas header, open the exhaust gas valve of No. 1 hotblast stove simultaneously, after the exhaust gas valve of No. 1 hotblast stove is opened, open the exhaust gas valve of No. 3 hotblast stoves, such No. 1 hotblast stove is by No. 1 exhaust gas valve, waste gas header, No. 3 exhaust gas valves and No. 1 hotblast stove have formed a communicating vessels, guaranteed the energy transformation between No. 1 hotblast stove and No. 3 hotblast stoves.After pressure equilibrium, close after No. 3 exhaust gas valves, No. 1 exhaust gas valve, waste gas header trip valve, enter traditional hotblast stove and control technique, No. 3 hotblast stoves enter normal air-supply and control technique, No. 1 hotblast stove enters burning and controls technique, by such pressure equilibrium, can greatly shorten the process to No. 3 hotblast stove pressurisings, so also just reduced wind loss.
With respect to prior art tool of the present invention, have the following advantages, this apparatus structure is simple, cost is lower, easy handling, secondly, the method can significantly shorten the pressurising time, and the pressurising time directly affects the fluctuation of State of Blast Furnace internal pressure, and this process utilizes waste gas pressurising generally can save 4 minutes pressurising time.Two hotblast stoves utilize waste gas pressurising simultaneously, and two hotblast stoves are all high temperature pressure balances, little on temperature impact, compare and carry out pressurising with cold wind, and loses heat is less.
Accompanying drawing explanation
Fig. 1 is each valve of hotblast stove and pipeline schematic diagram;
Fig. 2 is all the people present's hotblast stove layout schematic diagram;
Fig. 3 is exhaust gas of hot-blast stove pressurising schema.
In figure 1, thing chimney valve; 2, cold blast valve; 3, equalizer valve; 4, exhaust gas valve; 5, gas-fired valve; 6, air cutoff valve; 7, hot blast valve; 8, gas stop valve; 9, gas main; The hot-blast main of 10, leading to blast furnace; 11, blast main; 12, waste gas header; 13, flue gas house steward; 14, waste gas header trip valve; 15, waste gas header by-pass valve, 16 is body of heater, 17 is air main.
embodiment
?in order to deepen the understanding of the present invention, below in conjunction with accompanying drawing, the present invention is described in detail.
Referring to Fig. 1: a kind of blast-furnace hot-air furnace exhaust pressurizing device, comprise body of heater 16, one end of body of heater connects blast main 11, waste gas header 12 and flue gas house steward 13, the other end of body of heater is connected with air main 17, gas main 9 and the hot-blast main 10 of leading to blast furnace, on described blast main 11, be provided with cold blast valve 2, on blast main, be also provided with the inflation valve arranged side by side with cold blast valve 3, hot-blast main upper 10 is provided with hot blast valve 7, on described flue gas house steward 13, be provided with chimney valve 1, on waste gas header 12, be provided with exhaust gas valve 4, on gas main 9, be provided with gas stop valve 8 and gas-fired valve 5, on air main 17, be provided with air cutoff valve 6, on described waste gas header 12, be also provided with waste gas header trip valve 14.Two valves are installed in being improved to of this device most critical additional on waste gas header, waste gas header trip valve 14 and waste gas header by-pass valve 15 are installed on waste gas header, why be arranged to two valves, its effect is to prevent that the valve from breaking down, and another valve can guarantee normally carrying out of production.
Referring to Fig. 2,3, Fig. 2 arranges schematic diagram for all the people present's hotblast stove, and Fig. 3 is exhaust gas of hot-blast stove pressurising schema.
No. 1, No. 2 hotblast stoves air-supply of take is below example, according to traditional control method, press logical program, and next the hot blast heat (batch) number of air-supply in parallel is No. 2, No. 3, after changing stove signal and sending, this constantly No. 3 hotblast stove states be the stewing stove state after burning.According to general control method, first No. 3 hotblast stoves in stewing stove state are entered to ventilation state from stewing stove state, by logical order figure, first open the pressure between the total road 11 of equalizer valve balance air blast and No. 3 hotblast stoves, at this time for pressure equilibrium, supplementing into the air quantity of No. 3 hotblast stoves is exactly to enter by hot-blast main the air quantity of high furnace interior, loss that Here it is, after the good pressure of inflation valve 3 balances, open immediately cold blast valve 2, then drive hot blast valve 7, after hot blast valve 7 is opened, send into the air quantity immediate recovery balance of high furnace interior, this is equivalent to three hotblast stoves constantly in air-supply, at No. 3 hotblast stoves, enter after ventilation state completely, No. 1 hotblast stove is switched to stewing stove state, close cold blast valve 2 and hot blast valve 7, and then open the hyperbaric environment of ventilation state in No. 1 hot blast valve of exhaust gas valve 4 balance, when pressure reaches set(ting)value, open thing chimney valve 1, air cutoff valve 6, gas stop valve 8, gas-fired valve 5, enter state of combustion, at this moment sign changes furnace accretion bundle.
Method of the present invention is, after changing stove signal and sending, these moment No. 3 hotblast stove states are the stewing stove state after burning, No. 1 hotblast stove is ventilation state, requiring to change after stove, immediately No. 1 hotblast stove is cut to stewing stove state, this is to control the different place of technique with tradition, after No. 1 stewing stove of hotblast stove, close after waste gas header trip valve 14 and waste gas header by-pass valve 15 complete, open the exhaust gas valve 4 of No. 1 hotblast stove, open again the exhaust gas valve 4 of No. 3 hotblast stoves, such No. 1, No. 3 hotblast stove just forms a communicating vessels by two exhaust gas valves, pressure in high pressure in No. 1 hotblast stove and No. 3 hotblast stoves is carried out to balance, when No. 3 hotblast stove pressure reach certain value, by theoretical two pressure meeting complete equipilibrium, but because the timing relationship of changing stove, when arriving set(ting)value, just carry out next step operation, close two exhaust gas valves 4, then open waste gas header trip valve 14, after these complete, open again the inflation valve 3 of No. 3 hotblast stoves, finally pressure is carried out to balance, then enter ventilation state, because No. 3 hotblast stoves are by No. 1 hotblast stove pressure equilibrium, this process is very short, on blast furnace, impact can be ignored, after No. 3 hotblast stove air-supplies, No. 1 hotblast stove enters the state that stewing stove turns burning, complete the whole stove process of changing.
Need specification sheets, above embodiment is only preferred embodiment of the present invention, is not that protection scope of the present invention is as the criterion with claims for limiting protection scope of the present invention.
Claims (6)
1. a blast-furnace hot-air furnace exhaust pressurizing device, comprise body of heater, one end of body of heater connects blast main, waste gas header and flue gas house steward, the other end of body of heater is connected with air main, gas main and the hot-blast main of leading to blast furnace, on described blast main, be provided with cold blast valve, on blast main, be also provided with the inflation valve arranged side by side with cold blast valve, on hot-blast main, be provided with hot blast valve, on described flue gas house steward, be provided with chimney valve, on waste gas header, be provided with exhaust gas valve, on gas main, be provided with gas stop valve and gas-fired valve, on air main, be provided with air cutoff valve, it is characterized in that: on described waste gas header, be also provided with waste gas header trip valve.
2. a kind of blast-furnace hot-air furnace exhaust pressurizing device according to claim 1, is characterized in that: on described waste gas header, be also provided with the waste gas header by-pass valve in parallel with waste gas header trip valve.
3. a method for the blast-furnace hot-air furnace exhaust pressurising that employing is installed as claimed in claim 1 or 2, is ventilation state by No. 1, No. 2 hotblast stove ventilation states are converted to No. 2, No. 3 hotblast stoves,
It is characterized in that the method comprises the following steps:
1) No. 1, No. 2 hotblast stove is ventilation state, and after changing stove signal and sending, No. 1 hotblast stove transfers stewing stove state to by ventilation state, and No. 1 all valve of hotblast stove is all closed;
2) close the waste gas header trip valve being arranged on waste gas header, open the exhaust gas valve of No. 1 hotblast stove simultaneously, after the exhaust gas valve of No. 1 hotblast stove is opened, open the exhaust gas valve of No. 3 hotblast stoves;
3), after pressure equilibrium, close the exhaust gas valve of No. 3 hotblast stoves, No. 1 exhaust gas of hot-blast stove valve and waste gas header trip valve;
4) No. 3 hotblast stoves enter air-supply and control technique;
5) No. 1 hotblast stove enters burning and controls technique.
4. blast-furnace hot-air furnace exhaust pressurising method according to claim 3, is characterized in that in described step 4), No. 3 hotblast stoves enter in air-supply control technique, is mainly the exhaust gas valve of opening No. 3 hotblast stoves, and this hotblast stove is carried out to pressure balanced adjustment.
5. blast-furnace hot-air furnace exhaust pressurising method according to claim 3, is characterized in that: in described step 5), No. 1 hotblast stove enters in burning control technique and is mainly the stove process of boiling in a covered pot over a slow fire, and after this end of processing, enters state of combustion.
6. blast-furnace hot-air furnace exhaust pressurising method according to claim 3, is characterized in that: described step 3), the detection of pressure balance is by timing or flow detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210220640.4A CN103509904A (en) | 2012-06-29 | 2012-06-29 | Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove |
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| CN201210220640.4A CN103509904A (en) | 2012-06-29 | 2012-06-29 | Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020092A (en) * | 2019-12-06 | 2020-04-17 | 中冶华天工程技术有限公司 | Pressure-equalizing energy recovery system for blast furnace hot blast stove and use method thereof |
| CN114774606A (en) * | 2022-02-28 | 2022-07-22 | 鞍钢股份有限公司 | Blast furnace hot blast stove changing and pressure equalizing method |
| CN115029492A (en) * | 2022-07-13 | 2022-09-09 | 中冶京诚工程技术有限公司 | Hot-blast stove charging and discharging system and control method thereof |
| CN115094179A (en) * | 2022-07-13 | 2022-09-23 | 中冶京诚工程技术有限公司 | Hot blast stove furnace change waste gas recycling system and method |
| CN115181827A (en) * | 2022-07-13 | 2022-10-14 | 中冶京诚工程技术有限公司 | Hot blast stove charging and discharging pressure system and charging and discharging pressure control method |
| CN115838843A (en) * | 2023-02-20 | 2023-03-24 | 山西建龙实业有限公司 | Device and method for recovering residual hot air of hot blast stove |
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| JPS5728945A (en) * | 1980-07-28 | 1982-02-16 | Kubota Ltd | Supplying method of hot blast |
| JPS60255910A (en) * | 1984-05-30 | 1985-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Method of controlling pressurization of hot stove |
| CN1080659A (en) * | 1992-06-26 | 1994-01-12 | 首钢总公司 | Useless wind recoverying and utilizing method of hotblast stove and device |
| CN1888085A (en) * | 2005-06-27 | 2007-01-03 | 天津天铁冶金集团有限公司 | No-fluctuation hot blast stove converting method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5728945A (en) * | 1980-07-28 | 1982-02-16 | Kubota Ltd | Supplying method of hot blast |
| JPS60255910A (en) * | 1984-05-30 | 1985-12-17 | Ishikawajima Harima Heavy Ind Co Ltd | Method of controlling pressurization of hot stove |
| CN1080659A (en) * | 1992-06-26 | 1994-01-12 | 首钢总公司 | Useless wind recoverying and utilizing method of hotblast stove and device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020092A (en) * | 2019-12-06 | 2020-04-17 | 中冶华天工程技术有限公司 | Pressure-equalizing energy recovery system for blast furnace hot blast stove and use method thereof |
| CN114774606A (en) * | 2022-02-28 | 2022-07-22 | 鞍钢股份有限公司 | Blast furnace hot blast stove changing and pressure equalizing method |
| CN115029492A (en) * | 2022-07-13 | 2022-09-09 | 中冶京诚工程技术有限公司 | Hot-blast stove charging and discharging system and control method thereof |
| CN115094179A (en) * | 2022-07-13 | 2022-09-23 | 中冶京诚工程技术有限公司 | Hot blast stove furnace change waste gas recycling system and method |
| CN115181827A (en) * | 2022-07-13 | 2022-10-14 | 中冶京诚工程技术有限公司 | Hot blast stove charging and discharging pressure system and charging and discharging pressure control method |
| CN115029492B (en) * | 2022-07-13 | 2023-10-27 | 中冶京诚工程技术有限公司 | Hot-blast stove pressure charging and discharging system and control method thereof |
| CN115094179B (en) * | 2022-07-13 | 2023-11-14 | 中冶京诚工程技术有限公司 | System and method for recycling waste gas generated during furnace changing of hot blast stove |
| CN115181827B (en) * | 2022-07-13 | 2024-02-27 | 中冶京诚工程技术有限公司 | Hot-blast stove charging and discharging pressure system and charging and discharging pressure control method |
| CN115838843A (en) * | 2023-02-20 | 2023-03-24 | 山西建龙实业有限公司 | Device and method for recovering residual hot air of hot blast stove |
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Application publication date: 20140115 |