CN103924021A - Blast furnace and hot blast stove constant-pressure changing system and method thereof - Google Patents
Blast furnace and hot blast stove constant-pressure changing system and method thereof Download PDFInfo
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- CN103924021A CN103924021A CN201410111954.XA CN201410111954A CN103924021A CN 103924021 A CN103924021 A CN 103924021A CN 201410111954 A CN201410111954 A CN 201410111954A CN 103924021 A CN103924021 A CN 103924021A
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Abstract
The invention provides a blast furnace and hot blast stove constant-pressure changing system. The system comprises a blast furnace, a plurality of hot blast stoves and an air blower station, wherein an air blower in the air blower station has a fixed wind pressure control mode and a fixed wind quantity control mode. When a control system of the blast furnace sends a hot blast stove changing signal, the air blower is switched to the fixed wind pressure control mode while when the control system of the blast furnace sends a hot blast stove changing finishing signal, the air blower is switched to the fixed wind quantity control mode. The system has the advantages that the pressures of a cold wind general pipe and a hot wind general pipe in change of the hot blast stoves are maintained stable, the change of the hot blast stoves is ensured smooth, the influence of change of the hot blast stoves on the blast furnace is reduced, and the adjusting frequency of a pressurizing valve is further reduced, so that the stove changing time is shortened. A control program is newly added to operate on the existing upper computer of the control system and existing hardware equipment is fully utilized, so that the system is less in investment and convenient to retrofit.
Description
Technical field
The present invention relates to a kind of blast funnace hot blast stove constant voltage and change furnace system and method thereof, in changing-over stove process, keep blast-furnace hot-air pressure steady.
Background technology
Blast furnace needs the hot blast of stable and continuous while normally smelting, hotblast stove is the device that high-temperature hot-air is provided for blast-furnace smelting.The fluctuation of hot-blast pressure is unfavorable to the smooth-going operation of blast furnace.General blast furnace is equipped with three to all the people present's hotblast stove, and hotblast stove has burning, air-supply, and stewing three kinds of states of stove, must ensure to have a hotblast stove at least in ventilation state.Hotblast stove finishes in burning, when the hotblast stove dome temperature in air-supply is also high, proceeds to stewing stove state, waits for that the hotblast stove dome temperature of air-supply, lower than set(ting)value, sends and changes stove instruction, and the hotblast stove in stewing stove proceeds to ventilation state.The conversion of hotblast stove state realizes by the combination of hot-blast furnace valve.Hotblast stove is by burning or when stewing stove proceeds to ventilation state, hotblast stove inside is normal pressure, and need to open equalizer valve is the inner pressurising of hotblast stove, open cold air-valve while waiting the total overpressure of hotblast stove internal pressure and cold wind balanced, hot blast valve, putting in blast.In Plenum Process, air blower station uses to be determined when cold flow regulates to cause the larger decline of hot-blast main's pressure, causes the fluctuation of blast furnace pressure of air supply.Now generally carry out pressurising with the little equalizer valve of opening, this method can only reduce pressure surge, but pressure surge is still larger.
Air blower station is to utilize gas compression machinery after atmosphere pressurization, to supply with the power station of blast-furnace smelting required air, and it is confessed air and imports cold wind house steward.Cold wind house steward has pressure detection and flow detection, and access air blower station Controlling System, air compressor control pattern has quantitative wind pressure control and determines two kinds of air quantity controls, determine blast and regulate master mode to keep cold wind house steward constant pressure, determine air quantity, to regulate master mode maintenance cold wind house steward to be sent to the air quantity of blast funnace hot blast stove constant.
In technical spirit with the present invention relatively approach have two kinds.
First method is that ZL200520109452.X patent is mentioned.I.e. newly-increased pressurising pipeline and a diffusion valve, keep larger cold flow, cold wind outside required with blast furnace comes for hotblast stove pressurising, when pressurising, by closing gradually newly-increased diffusion valve, cold wind is introduced to the pressurising of pressurising pipeline, and cold wind unnecessary after pressurising all diffuses by diffusion valve.The flow that it is characterized by cold wind on detection pressurising pipeline is controlled the aperture of diffusing variable valve, keeps the cold flow of air-supply constant, reduces the fluctuation of hot-blast pressure while changing stove.This kind of method need increase specified a part of cold wind newly, and the requirement of gas blower is improved, newly-increased a part of pipeline, and valve and under meter, hardware investment is also higher, and the hotblast stove pressurising time is shorter, and the extra cold wind of the overwhelming majority all diffuses, and cold wind utilization ratio is lower.
Second method is that application number is mentioned for 200510014060.X invents.Be the cold wind wind regime of hotblast stove pressurising from pressurized air bag independently, through purifying dehydration, then access hotblast stove by equalizer valve, the cold wind pressure surge of having avoided air-supply and pressurising jointly to use cold wind to cause, has ensured the continous-stable that hotblast stove is blown.This method requires there is independently pressurized air bag and with extra purification dewatering unit, pressurized air bag internal pressure will with the total overpressure balance of cold wind, not so do not have the effect of balanced hot-blast stove inside and outside differential pressure to hotblast stove pressurising.It has increased equipment newly, and hardware investment is also higher, has increased control difficulty.
Summary of the invention
Object of the present invention aims to provide a kind of blast funnace hot blast stove constant voltage and changes stove method, to overcome the defect that exists of above-mentioned prior art.
The invention provides a kind of blast funnace hot blast stove constant voltage and change furnace system, comprising: blast furnace, several hotblast stoves and air blower station; Gas blower in air blower station has quantitative wind pressure control pattern and determines air quantity master mode; In the time that the Controlling System of blast furnace is sent changing-over stove signal, gas blower switches to quantitative wind pressure control pattern; When the Controlling System of blast furnace is sent changing-over stove end signal, gas blower switches to determines air quantity master mode.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change furnace system, can also there is such feature: the default constant voltage of Controlling System of air blower station is changed fire bars part; The Controlling System of blast furnace is sent before changing-over stove signal, and air blower station Controlling System determines whether that meeting constant voltage changes fire bars part; In the time that described constant voltage is changed fire bars part and met, the Controlling System of gas blower allows constant voltage to change stove, otherwise does not allow.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change furnace system, can also there is such feature: the Controlling System of air blower station has distance control mode and local master mode; Constant voltage is changed fire bars part: air blower station is in distance control mode, and the Controlling System of blast furnace allows to change stove, and gas blower is in determining air quantity master mode, and the rotating speed of gas blower is in preset range.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change furnace system, can also there is such feature: the actual blast of air blower station when the setting blast of quantitative wind pressure control pattern is switching.
In addition, the invention provides a kind of blast funnace hot blast stove constant voltage and change stove method, in the time that the Controlling System of blast furnace is sent changing-over stove signal, gas blower switches to quantitative wind pressure control pattern; In the time that the Controlling System of blast furnace is sent changing-over stove end signal, gas blower switches to determines air quantity master mode.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change stove method, can also have such feature: the Controlling System of blast furnace is sent before changing-over stove signal, air blower station Controlling System determines whether that meeting constant voltage changes fire bars part; In the time that constant voltage is changed fire bars part and met, the Controlling System of gas blower allows constant voltage to change stove; Otherwise do not allow.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change stove method, can also there is such feature: constant voltage is changed fire bars part: air blower station is in distance control mode, and the Controlling System of blast furnace allows to change stove, gas blower is in determining air quantity master mode, and the rotating speed of gas blower is in preset range.
Further, the invention provides a kind of blast funnace hot blast stove constant voltage and change stove method, can also there is such feature: the actual blast of air blower station when the setting blast of quantitative wind pressure control pattern is switching.
The beneficial effect of the invention
Blast funnace hot blast stove constant voltage provided by the invention is changed furnace system and method thereof, and the method that relies on hotblast stove and air blower station to link realizes hotblast stove constant voltage and changes stove, optimizes air compressor control program, follows the tracks of changing-over stove signal, the master mode of automatic switchover gas blower.
Blast funnace hot blast stove constant voltage provided by the invention is changed furnace system and method thereof, the newly-increased switch that allows constant voltage to change furnace zone state locking in blast furnace watch-keeping cubicle, in air compressor control chamber, newly-increased constant voltage is changed stove " long-range/this locality " transfer lever, and high furnace control system Heat of Formation wind furnace changes one of stove signal.Constant voltage is changed the dual permission that stove needs high furnace side and air blast pusher side.High furnace control system detects the valve position of hotblast stove equalizer valve, and when equalizer valve is opened to littlely while opening limit position and the irrelevant limit signal of equalizer valve, high furnace control system is judged as and changes stove, and teletransmission is to blast blower control system, changes the operational conditions of stove as constant voltage.When changing-over stove, air compressor control pattern automatically switches to quantitative wind pressure control pattern by determining air quantity master mode, and the blast set(ting)value during using blast actual value now as blast control keeps changing the stable of stove process Wind pressure with this.In the time changing furnace accretion bundle, while changing the reset of stove signal, air compressor control pattern is automatically switched to and is determined air quantity master mode by quantitative wind pressure control pattern, and blast set(ting)value returns to the blast set(ting)value while not changing stove, and air quantity set(ting)value is the air quantity set(ting)value while not changing stove.Blast funnace hot blast stove constant voltage changes furnace system and method can keep changing stove cold wind house steward, hot-blast main's pressure-stabilisation, ensures the smooth-going of changing-over stove, reduces the impact of changing-over stove on blast furnace, can also reduce the regulating frequency of equalizer valve, shortens and changes the stove time; Constant voltage is changed furnace system and is moved on existing Controlling System upper computer, makes full use of existing hardware equipment, and amount of investment is little, and transformation is convenient.
Brief description of the drawings
Fig. 1 is the structural representation that blast funnace hot blast stove constant voltage of the present invention is changed furnace system.
Fig. 2 is the schema that blast funnace hot blast stove constant voltage of the present invention is changed furnace system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Fig. 1 is the structural representation that blast funnace hot blast stove constant voltage of the present invention is changed furnace system.
As shown in Figure 1, blast funnace hot blast stove constant voltage is changed furnace system and is comprised: blast furnace 51, three hotblast stoves 52 and air blower stations 54.
Three hotblast stoves 52 are labeled as respectively hotblast stove A, hotblast stove B, hotblast stove C.
Each hotblast stove has: combustion air variable valve 3, combustion air combustion valve 4, hot blast valve 5, gas regulator 6, gas stop valve 7, gas bleeding valve 8, gas-fired valve 9, chimney valve 10, equalizer valve 11, cold blast valve 12, exhaust gas valve 13, chimney valve 14, cold air adjusting valve 15.
Hotblast stove 52 is connected with refluence damping down valve 16, blast furnace 51 by hot-blast main.Hotblast stove 52 is connected with burner blower 53 by combustion air house steward, and thermophore 60 and combustion air diffusion valve 20 are set in combustion air house steward.Hotblast stove 52 passes into coal gas by gas main, and thermophore 60 is also set in gas main.Hotblast stove 52 is connected with chimney 55 by breadboard, and thermophore 60 is set in breadboard equally.Hotblast stove 52 is connected with air blower station 54 by cold wind house steward, and snorting valve 21 is set in cold wind house steward.
Thermophore 60 comprises well heater 20, inlet valve 18, outlet valve 19 and by-pass valve 19, and ducted gas is heated.
Air blower station 54 is connected with blast furnace 51 by cold air duct, and mixed wind trip valve 1 and mixed wind variable valve 2 are also set in pipeline.
The stove process of changing of hotblast stove: when hotblast stove 52 transfers air-supply to by burning, close gas regulator 6, close gas-fired valve 9, close gas stop valve 7, close combustion air variable valve 3, close combustion air combustion valve 4, close chimney valve 10, open equalizer valve 11, after pressurising, open hot blast valve 5, open cold blast valve 12, complete the stove process of changing, according to hot-blast main's wind-warm syndrome, adjusting mixed air variable valve 2, keeps hot blast temperature stable.
Open spacing and depart from and close when spacing to little opening equalizer valve 11, high furnace control system sends changing-over stove signal to blast blower control system.
Open when the rear wait cold blast valve 12 front and back pressure reduction of equalizer valve 11 equal set-point and close equalizer valve 11, open hot blast valve 5, hot blast valve 5 leaves cold blast valve 12 after opening, and now the Controlling System of blast furnace is sent changing-over stove end signal.
Gas blower in air blower station has quantitative wind pressure control pattern and determines air quantity master mode, and the Controlling System of gas blower can be sent according to the Controlling System of blast furnace the operational mode of changing-over stove signal switching gas blower.In the time that the Controlling System of blast furnace is sent changing-over stove signal, gas blower switches to quantitative wind pressure control pattern; When the Controlling System of blast furnace is sent changing-over stove end signal, gas blower switches to determines air quantity master mode.
The Controlling System of air blower station has distance control mode and local master mode, has a corresponding constant voltage and change stove " long-range/this locality " transfer lever on air compressor control panel.
In the Controlling System of gas blower, preset the condition that constant voltage is changed stove, be specially air blower station in distance control mode, high furnace side allows constant voltage to change stove, and gas blower is in determining air quantity master mode, and the rotating speed of gas blower is in processing range.Certainly this condition can increase or change according to the actual needs of different blast furnaces.On the control panel of blast furnace, having one corresponding one allows constant voltage to change furnace zone state locking key.The Controlling System of blast furnace is sent before changing-over stove signal, and the Controlling System of gas blower determines whether that meeting constant voltage changes fire bars part; In the time that constant voltage is changed fire bars part and met, allow constant voltage to change stove; Otherwise, do not allow constant voltage to change stove.
When the Controlling System of blast furnace is accepted changing-over stove signal that the Controlling System of blast furnace sends, the Controlling System control air compressor control pattern of gas blower changes quantitative wind pressure control pattern into by determining air quantity master mode, blast initial set value is now kept in, and now blast actual value is assigned to blast set(ting)value.In the time of changing-over stove signal ended, the Controlling System control air compressor control pattern of gas blower is switched to and is determined air quantity master mode by quantitative wind pressure control pattern, and temporary blast initial set value is recovered, and completes constant voltage and changes stove control process.
Fig. 2 is the schema that blast funnace hot blast stove constant voltage of the present invention is changed furnace system.
As shown in Figure 2, to change the flow process of stove method as follows for blast funnace hot blast stove constant voltage:
The first step: the Controlling System of gas blower first determines whether that possessing constant voltage changes fire bars part, that is: high furnace side allows constant voltage to change stove, and constant voltage is changed stove transfer lever and is got to remote status, and gas blower is in determining air quantity master mode, and blower speed is in processing range.
If judge that meeting constant voltage changes fire bars part, enter constant voltage and change stove ready state, wait for changing-over stove signal; Otherwise return and continue monitoring and whether meet constant voltage and change fire bars part.
Second step: whether the Controlling System of blast furnace sends changing-over stove signal, equalizer valve open to little open spacing and depart from close spacing.
In the time that the Controlling System of blast furnace is sent changing-over stove signal, the Controlling System of air blower station is switched gas blower and is entered quantitative wind pressure control pattern.Now, blast actual value is as the dividing potential drop set(ting)value of determining blast pattern.In heat exchange wind furnace process, the Controlling System of air blower station regulates so that cold wind house steward constant pressure gas blower.Now, blast initial set value is kept in the register of Controlling System of air blower station.
The Controlling System of blast furnace is not sent changing-over stove signal, and continuous and constant pressure changes stove ready state.
The 3rd step: whether the Controlling System of blast furnace sends changing-over stove end signal, cold blast valve is opened.
In the time that the Controlling System of blast furnace is sent changing-over stove end signal, the Controlling System switching gas blower of air blower station enters determines air quantity master mode.Now, the initial blast set(ting)value in the register of the Controlling System of air blower station is become to current blast set(ting)value, air quantity set(ting)value still keeps the value before switching.Complete changing-over stove process.
The Controlling System of blast furnace is not sent changing-over stove end signal, and gas blower maintains quantitative wind pressure control pattern.
In changing-over stove process, be that air compressor control pattern is while being quantitative wind pressure control pattern, as Special Circumstances or abnormal conditions occur, and (gas blower breaks down or extremely, receive blast furnace emergency situation or checking notice etc.), gas blower operator should change constant voltage stove " long-range/this locality " transfer lever and switch to local state, then by normal fan operation step operation.
In whole process, detect blower speed, cold wind house steward flow, the total pipe pressure of cold wind, runs into over speed of rotation, and cold flow is high reports to the police, and pressure regulates the situation of distortion, automatically ends constant voltage and changes stove process, returns to air quantity master mode, and sends warning.
Same, on the control panel of blast furnace, allow constant voltage to change furnace zone state locking key, can occur under Special Circumstances or abnormal conditions, by blast furnace operating, personnel close, do not give the blast furnace constant voltage condition of changing stove, facilitate control personnel to control neatly blast funnace hot blast stove constant voltage and change the state of stove according to on-the-spot practical situation.
Claims (8)
1. blast funnace hot blast stove constant voltage is changed a furnace system, comprising: blast furnace, several hotblast stoves and air blower station, is characterized in that:
Gas blower in described air blower station has quantitative wind pressure control pattern and determines air quantity master mode;
In the time that the Controlling System of described blast furnace is sent changing-over stove signal, described gas blower switches to quantitative wind pressure control pattern;
When the Controlling System of described blast furnace is sent changing-over stove end signal, described gas blower switches to determines air quantity master mode.
2. blast funnace hot blast stove constant voltage according to claim 1 is changed furnace system, it is characterized in that:
Wherein, the default constant voltage of the Controlling System of described gas blower is changed fire bars part;
The Controlling System of described blast furnace is sent before described changing-over stove signal, and blast blower control system determines whether that meeting constant voltage changes fire bars part;
In the time that described constant voltage is changed fire bars part and met, the Controlling System of described gas blower allows constant voltage to change stove, otherwise does not allow.
3. blast funnace hot blast stove constant voltage according to claim 2 is changed furnace system, it is characterized in that:
Wherein, the Controlling System of described air blower station has distance control mode and local master mode;
Described constant voltage is changed fire bars part: described air blower station is in distance control mode, and the Controlling System of described blast furnace allows to change stove, and described gas blower is determined air quantity master mode in described, and the rotating speed of described gas blower is in preset range.
4. change furnace system according to the blast funnace hot blast stove constant voltage described in any one in claims 1 to 3, it is characterized in that:
Wherein, the actual blast of air blower station described in when the setting blast of described quantitative wind pressure control pattern is switching.
5. blast funnace hot blast stove constant voltage is changed a stove method, it is characterized in that:
In the time that the Controlling System of blast furnace is sent changing-over stove signal, gas blower switches to level pressure master mode;
In the time that the Controlling System of described blast furnace is sent changing-over stove end signal, described gas blower switches to determines air quantity master mode.
6. blast funnace hot blast stove constant voltage according to claim 5 is changed stove method, it is characterized in that:
Wherein, the Controlling System of described blast furnace is sent before described changing-over stove signal, and blast blower control system determines whether that meeting constant voltage changes fire bars part; In the time that described constant voltage is changed fire bars part and met, the Controlling System of described gas blower allows constant voltage to change stove, otherwise does not allow.
7. blast funnace hot blast stove constant voltage according to claim 6 is changed stove method, it is characterized in that:
Wherein, described constant voltage is changed fire bars part: described air blower station is in distance control mode, and the Controlling System of described blast furnace allows to change stove, and described gas blower is determined air quantity master mode in described, and the rotating speed of described gas blower is in preset range.
8. change stove method according to the blast funnace hot blast stove constant voltage described in any one in claim 5 to 7, it is characterized in that:
Wherein, the actual blast of air blower station described in when the setting blast of described quantitative wind pressure control pattern is switching.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410111954.XA CN103924021A (en) | 2014-03-24 | 2014-03-24 | Blast furnace and hot blast stove constant-pressure changing system and method thereof |
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| CN201410111954.XA CN103924021A (en) | 2014-03-24 | 2014-03-24 | Blast furnace and hot blast stove constant-pressure changing system and method thereof |
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Cited By (9)
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| CN104232823A (en) * | 2014-09-30 | 2014-12-24 | 江苏永钢集团有限公司 | Control method for furnace exchange of hot air furnace under constant pressure |
| CN105671233A (en) * | 2016-04-14 | 2016-06-15 | 中冶华天工程技术有限公司 | Coal gas pressurizing system of hot-blast heater |
| 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 |
| CN107574273A (en) * | 2017-08-29 | 2018-01-12 | 武汉凯迪工程技术研究总院有限公司 | Blast-furnace hot-air system temperature regulation and control method and apparatus based on plasma heating |
| CN111206132A (en) * | 2020-03-04 | 2020-05-29 | 宝钢湛江钢铁有限公司 | Method for optimally and intensively blowing air in parallel for hot blast stove |
| CN111778374A (en) * | 2020-06-13 | 2020-10-16 | 安徽长江钢铁股份有限公司 | Automatic balancing method for changing pressure of hot blast stove |
| CN112593032A (en) * | 2020-12-11 | 2021-04-02 | 安徽工业大学 | Key parameter processing method for blast furnace heat exchange air furnace |
| CN114350867A (en) * | 2022-01-10 | 2022-04-15 | 广东韶钢松山股份有限公司 | Blast furnace operation system and combustion fan switching method |
| CN115029493A (en) * | 2022-06-29 | 2022-09-09 | 马钢集团设计研究院有限责任公司 | Blast furnace hot blast stove air temperature lifting method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232823A (en) * | 2014-09-30 | 2014-12-24 | 江苏永钢集团有限公司 | Control method for furnace exchange of hot air furnace under constant pressure |
| CN104232823B (en) * | 2014-09-30 | 2016-04-20 | 江苏永钢集团有限公司 | Hotblast stove level pressure changes stove control method |
| CN105671233A (en) * | 2016-04-14 | 2016-06-15 | 中冶华天工程技术有限公司 | Coal gas pressurizing system of hot-blast heater |
| 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 |
| CN107574273A (en) * | 2017-08-29 | 2018-01-12 | 武汉凯迪工程技术研究总院有限公司 | Blast-furnace hot-air system temperature regulation and control method and apparatus based on plasma heating |
| CN111206132A (en) * | 2020-03-04 | 2020-05-29 | 宝钢湛江钢铁有限公司 | Method for optimally and intensively blowing air in parallel for hot blast stove |
| CN111778374A (en) * | 2020-06-13 | 2020-10-16 | 安徽长江钢铁股份有限公司 | Automatic balancing method for changing pressure of hot blast stove |
| CN112593032A (en) * | 2020-12-11 | 2021-04-02 | 安徽工业大学 | Key parameter processing method for blast furnace heat exchange air furnace |
| CN112593032B (en) * | 2020-12-11 | 2024-03-26 | 安徽工业大学 | Key parameter processing method for blast furnace heat exchange air furnace |
| CN114350867A (en) * | 2022-01-10 | 2022-04-15 | 广东韶钢松山股份有限公司 | Blast furnace operation system and combustion fan switching method |
| CN115029493A (en) * | 2022-06-29 | 2022-09-09 | 马钢集团设计研究院有限责任公司 | Blast furnace hot blast stove air temperature lifting method |
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Application publication date: 20140716 |