CN103981319B - The method for controlling combustion of a kind of hot blast stove system and correspondence thereof - Google Patents
The method for controlling combustion of a kind of hot blast stove system and correspondence thereof Download PDFInfo
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- CN103981319B CN103981319B CN201410227557.9A CN201410227557A CN103981319B CN 103981319 B CN103981319 B CN 103981319B CN 201410227557 A CN201410227557 A CN 201410227557A CN 103981319 B CN103981319 B CN 103981319B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The invention provides a kind of hot blast stove system, owing to have employed two Valve controlling combustion airs (flow control valve and oxygen flow regulation valve), described Flow-rate adjustment air door fine adjustment air than 15: 1, guarantees combustion-supporting Sweet natural gas Thorough combustion with combustion-supporting Sweet natural gas; Described oxygen flow regulation air door is according to the feedback of oxygen amount measuring point, control enters system hot blast oxygen amount less than 1%, there is provided enough oxygen can to low temperature pyrogenation gas firing, system hot blast inert atmosphere can be maintained again, prevent raw coal in drying, pyrolytic process generation spontaneous combustion, risk of explosion.Thus overcome the defect of Combustion of Hot Air Furnace in prior art.
Description
Technical field
The present invention relates generally to a kind of hot blast stove system of improvement and the method for controlling combustion of correspondence thereof.
Background technology
Brown coal are pit coals that degree of coalification is minimum, a kind of brownish black, lacklustre grizzle between peat and pitch coal.Be rich in volatile matter, be easy to burn and smolder.Brown coal due to high-moisture, high-volatile, low heat value, and the feature of very easily spontaneous combustion, thus be unsuitable for standing storage and long-distance transportation, be considered a kind of low-grade coal resource for a long time, only be used as pit-head power station fuel and near coal-mine gasified raw material at present, limit the rational exploitation and utilization of lignite resource.How Efficient Conversion utilizes the low-rank coal such as brown coal just to become a major issue of coal utilization.Wherein the most interestingly brown coal are converted into the liquid fuel of relative clean.Effective comprehensive utilization of brown coal becomes a popular research in recent years and has the field of DEVELOPMENT PROSPECT.
At present, the equipment of domestic and international Combustion of Hot Air Furnace technology is more, mainly contains following several:
Top burning type hot blast stove combustor and control method (patent No. CN1254761A) the present invention thereof are a kind of ventilation cooling device for extending the top burning type hot blast stove combustor life-span and control method thereof, belong to the ironmaking technology field in Iron And Steel Industry.The present invention establishes a logical cold wind endless tube on the combustion air endless tube of existing top combustion stove, and described logical cold wind endless tube is connected with cold blast pipeline by logical cold air duct, and logical cold air duct is provided with logical cold wind intercepting valve and logical cold air adjusting valve.The control method of the logical cold air refrigerating device of top burning type hot blast stove combustor provided by the invention, can realize neither allowing hot blast enter burner and not allow again too much cold wind enter the object that top combustion stove affects wind-warm syndrome.
Combustion engine for hot blast stove (patent No. CN201787574U) a kind of combustion engine for hot blast stove, is made up of casing, burner, gas blower.Install combustion device and gas blower in casing, burner is pre-mixing gas combustion burner, be made up of housing, premixer, gas blower Link Port, combustion gas Link Port, burner plate, combustion chamber, housing by one end, combustion chamber stretches out outside casing together with combustion chamber, and hotblast stove fire door is stretched into together with the housing outside casing in combustion chamber.The combustion air that combustion gas and gas blower export enters premixer simultaneously, and after the pre-mixing before burning, enter combustion chambers burn through burner plate, flame is sprayed to burner hearth by fire door.Because have, the fresh combustion-supporting wind regime of gas blower continues, fair supply in combustion gas, and more have the pre-mixing before combustion through premixer, sufficient combustion is thorough, and thermo-efficiency is high.
The shortcoming that above-mentioned Combustion of Hot Air Furnace equipment mainly exists:
Part fire door can being only had to flow into for combustion-supporting fresh air in hotblast stove, can not meet the combustion-supporting demand of large discharge combustion gas far away, causes a large amount of combustion gas just to be siphoned away by the heat absorption blower fan of defeated hot systems without burning, wastes the energy, add oven dry cost;
The pyrolysis gas calorific value produced in the pyrolytic process of coal is low, and hearth of hot-blast stove temperature is low, pyrolysis gas incomplete combustion, and discharge causes atmospheric pollution.
Summary of the invention
The object of the present invention is to provide a kind of hot blast stove system and method for controlling combustion thereof of improvement, so that the defect of Combustion of Hot Air Furnace in prior art can be overcome.
To achieve these goals, hot blast stove system of the present invention have employed following structure: it includes hotblast stove, burner blower, burner, air door, valve, measuring sensor, described hotblast stove includes combustion chamber by separating and mixing section, described burner is arranged on combustion chamber, described burner blower converting operation accurately controls combustion air volume, pipeline between burner blower and burner is provided with exhaust-valve, quick closing damper is provided with between described exhaust-valve and burner, when after hotblast stove flame failure protection action, this quick closing damper quick closedown, prevent oxygen amount in stove from rising suddenly, pipeline between described quick closing damper and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, described Flow-rate adjustment pipeline is provided with Flow-rate adjustment air door, described oxygen flow regulation pipeline is provided with oxygen flow regulation air door, being provided with of described Flow-rate adjustment air door is beneficial to hotblast stove Initial Stage after Ignition accurate adjustment air quantity, meet burner blower and run minimum flow rate requirement, burner blower is avoided to run at unstable region, regulate the aperture of described Flow-rate adjustment air door, enough combustion airs are provided to make combustion gas can Thorough combustion, described oxygen flow regulation air door is according to oxygen amount sensor feedback signal, fine adjustment hot blast oxygen level, maintain inert atmosphere, meet subsequent technique needs.
Further, hot blast stove system of the present invention its also include the quick-closing valve be arranged on combustion-supporting natural gas line, natural gas line between described quick-closing valve and described burner is divided into two, be respectively combustion-supporting natural gas line and ignited natural gas pipeline, described combustion-supporting natural gas line is also provided with combustion-supporting natural gas adjusting valve, described ignited natural gas pipeline is also provided with ignited natural gas variable valve, above-mentioned two valves are regulated according to fire box temperature, remain that fire box temperature is between 800 to 950 degrees Celsius, ignited natural gas variable valve is often opened, play pilot burner effect.
Further, the spout of burner is circumferentially arranged, combustion-supporting Sweet natural gas is evenly arranged in inner periphery, low heat value pyrolysis gas is evenly arranged in excircle, when chamber temperature declines, open large combustion-supporting natural gas valve, turn down low heat value low temperature pyrogenation air valve, improve chamber temperature, guarantee the warm abundant mixed firing of venting one's spleen of low heat value.
Further, hot blast stove system of the present invention, low heat value pyrolysis gas enters the burner of hotblast stove by pyrolysis gas pipeline, described pyrolysis gas pipeline is provided with damper, being provided with chamber temperature measuring point in the combustion chamber of described hotblast stove, for monitoring chamber temperature, keeping chamber temperature between 800 to 950 degrees Celsius, adjust the pyrolysis tolerance entering burner hearth according to the feedback of chamber temperature measuring point in time, prevent the too low hotblast stove of chamber temperature from stopping working.
Further, hot blast stove system of the present invention, mixing wind enters the mixing section of hotblast stove by mixing wind pipeline, described mixing wind pipeline is provided with damper, system hot blast temperature measuring point is provided with in the mixing section of described hotblast stove, enter system hot blast temperature with monitoring, make to enter system hot blast temperature and meet coal drying, pyrolytic process needs, enter the temperature of system hot blast according to the Temperature displaying accurate adjustment entering system hot blast temperature measuring point.
Further, the method for controlling combustion that a kind of and above-mentioned hot-air system is corresponding, step one, hotblast stove is lighted a fire, and by starting burner blower, open quick closing damper, Sweet natural gas quick-closing valve, turn-on flow rate damper and ignited natural gas variable valve, initial igniter is lighted a fire; Step 2, hotblast stove heats up, and regulate combustion-supporting natural gas adjusting valve to start to heat up, adjust flux damper fine adjustment air compares 15:1 with combustion-supporting Sweet natural gas; Step 3, stable burning, after system hot blast temperature reaches design temperature, regulates mixing wind damper to maintain system hot blast temperature according to system hot blast temperature measuring point feedback temperature and stablizes.
Further, Combustion of Hot Air Furnace control method as above, in step 3, along with the carrying out of burning, system hot blast temperature can rise, and there is Low Temperature Thermal to vent one's spleen generation gradually, progressively open described low temperature pyrogenation gas damper, open large combustion-supporting natural gas adjusting valve according to chamber temperature measuring point Temperature Feedback and Flow-rate adjustment air door ensures flameholding.
Further, Combustion of Hot Air Furnace control method as above, according to the feedback of oxygen amount measuring point, by regulating oxygen flow regulation air door control system hot blast oxygen amount below 1%.
Further, Combustion of Hot Air Furnace control method as above, along with main device Low Temperature Thermal is vented one's spleen the increase of output, progressively drive large low temperature pyrogenation gas damper, combustion-supporting natural gas adjusting valve, Flow-rate adjustment air door, oxygen flow regulation air door to increase hotblast stove thermal load until main device oepration at full load.
Hot blast stove system of the present invention, owing to have employed two Valve controlling combustion airs (flow control valve and oxygen flow regulation valve), described Flow-rate adjustment air door fine adjustment air than 15:1, guarantees combustion-supporting Sweet natural gas Thorough combustion with combustion-supporting Sweet natural gas; Described oxygen flow regulation air door is according to the feedback of oxygen amount measuring point, control enters system hot blast oxygen amount less than 1%, there is provided enough oxygen can to low temperature pyrogenation gas firing, system hot blast inert atmosphere can be maintained again, prevent raw coal in drying, pyrolytic process generation spontaneous combustion, risk of explosion.
After have employed above-mentioned control method, chamber temperature can be made to maintain more than 800 DEG C all the time, to guarantee that low heat value pyrolysis gas fully completes burning, fine adjustment burning combustion air, make oxygen amount can meet combustion gas Thorough combustion needs, hot blast inert atmosphere can be maintained again, avoid feed coal spontaneous combustion in dry thermal cracking process to occur.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of Combustion of Hot Air Furnace control method of the present invention.
Embodiment
Object for a better understanding of the present invention, below in conjunction with background, accompanying drawing and actual condition, is described in detail the method for controlling combustion technique of hot blast stove system of the present invention and correspondence thereof.
Hot blast stove system of the present invention includes: hotblast stove 14, burner blower 1, burner 15, multiple air door, multiple valve, multiple measuring sensor, described hotblast stove 14 includes combustion chamber by separating and mixing section, described burner 15 is arranged at the sidepiece of combustion chamber, described burner blower 1 converting operation accurately controls combustion air volume, pipeline between burner blower 1 and burner 15 is provided with exhaust-valve 2, quick closing damper 3 is provided with between described exhaust-valve 2 and burner 15, when after hotblast stove flame failure protection action, this quick closing damper 3 quick closedown, prevent oxygen amount in stove from rising suddenly, pipeline between described quick closing damper 3 and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, described Flow-rate adjustment pipeline is provided with Flow-rate adjustment air door 4, described oxygen flow regulation pipeline is provided with oxygen flow regulation air door 5, being provided with of described Flow-rate adjustment air door 4 is beneficial to hotblast stove Initial Stage after Ignition accurate adjustment air quantity, meet burner blower and run minimum flow rate requirement, burner blower is avoided to run at unstable region, regulate the aperture of described Flow-rate adjustment air door 4, enough combustion airs are provided to make combustion gas can Thorough combustion, described oxygen flow regulation air door 5 is according to oxygen amount sensor 12 feedback signal, fine adjustment hot blast oxygen level, maintain inert atmosphere, meet subsequent technique needs.
Combustion-supporting Sweet natural gas enters burner 15 by combustion-supporting natural gas line, and described combustion-supporting natural gas line establishes quick-closing valve 6, quick closedown after hotblast stove flame failure protection action, and after preventing fire extinguishing, a large amount of Sweet natural gas enters hotblast stove, and then blasts; Natural gas line between described quick-closing valve 6 and described burner 15 is divided into two, be respectively combustion-supporting natural gas line and ignited natural gas pipeline, described combustion-supporting natural gas line is also provided with combustion-supporting natural gas adjusting valve 7, described ignited natural gas pipeline is also provided with ignited natural gas variable valve 8, above-mentioned two valves are regulated according to fire box temperature, remain that fire box temperature is between 800 to 950 degrees Celsius, ignited natural gas variable valve 8 is often opened, and plays pilot burner effect.
Low Temperature Thermal is vented one's spleen and is entered the combustion chamber of hotblast stove by pyrolysis gas pipeline, described pyrolysis gas pipeline is provided with damper 9, chamber temperature measuring point 11 is provided with in the combustion chamber of described hotblast stove, for monitoring chamber temperature, keep chamber temperature between 800 to 950 degrees Celsius, according to the feedback of chamber temperature measuring point 11, adjustment in time enters the pyrolysis tolerance of burner hearth, prevents the too low hotblast stove of chamber temperature from stopping working; Mixing wind enters the mixing section of hotblast stove by mixing wind pipeline, described mixing wind pipeline is provided with damper 10, system hot blast temperature measuring point 13 is provided with in the mixing section of described hotblast stove, system hot blast temperature is entered with monitoring, make to enter system hot blast temperature and meet coal drying, pyrolytic process needs, enter the temperature of system hot blast according to the Temperature displaying accurate adjustment entering system hot blast temperature measuring point 13.
Further, described hotblast stove inside is two chambers by building that burner hearth cuts off by refractory brick, and anterior combustion chamber maintains sufficiently high temperature (800 DEG C ~ 950 DEG C), ensures that Low Temperature Thermal is vented one's spleen Thorough combustion; Rear portion mixing section is by regulating the aperture of mixing air valve 10, and fine adjustment enters system hot blast temperature (300 DEG C ~ 550 DEG C), meets raw coal drying, pyrolysis needs.
Below in conjunction with the structure of above-mentioned fuel gas hot-blast stove, the detailed method for controlling combustion introducing this fuel gas hot-blast stove.System nitrogen replacement is complete, and hotblast stove oxygen level, below 1%, starts burner blower 1, opens quick closing damper 3, Sweet natural gas quick-closing valve 6, turn-on flow rate damper 4 and ignited natural gas variable valve 8, and initial igniter is lighted a fire.Tune to open combustion-supporting natural gas adjusting valve 7 after combustion chamber catches fire to start to heat up, adjust flux damper 4 fine adjustment air compares 15:1 with combustion-supporting Sweet natural gas, after system hot blast temperature reaches design temperature, regulate mixing wind damper 10 to maintain system hot blast temperature according to system hot blast temperature measuring point 13 feedback temperature and stablize.
Along with system hot blast temperature rises, Low Temperature Thermal is had to vent one's spleen generation gradually, progressively open low temperature pyrogenation gas damper 9, because Low Temperature Thermal calorific value of venting one's spleen is low, fire box temperature can start to decline, and opens large combustion-supporting natural gas adjusting valve 7 and Flow-rate adjustment air door 4 (maintaining air all the time with combustion-supporting Sweet natural gas than 15:1) ensures flameholding according to chamber temperature measuring point 11 Temperature Feedback.According to the feedback regulation oxygen flow regulation air door 5 Controlling System hot blast oxygen amount of oxygen amount measuring point 12 below 1%.According to the method described above along with main device Low Temperature Thermal is vented one's spleen the increase of output, progressively drive large low temperature pyrogenation gas damper 9, combustion-supporting natural gas adjusting valve 7, Flow-rate adjustment air door 4, oxygen flow regulation air door to increase hotblast stove thermal load until main device oepration at full load.
The Combustion of Hot Air Furnace control method of improvement of the present invention, chamber temperature can be made to maintain more than 800 DEG C all the time, to guarantee that low heat value pyrolysis gas fully completes burning, fine adjustment burning combustion air, make oxygen amount can meet combustion gas Thorough combustion needs, hot blast inert atmosphere can be maintained again, avoid feed coal spontaneous combustion in dry thermal cracking process to occur.
The above is only a kind of embodiment of hot blast stove system of the present invention and its method for controlling combustion; should be understood that; for those skilled in the relevant art; under the premise without departing from the principles of the invention; the trickle modification made and improvement, also should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a hot blast stove system, it is characterized in that, include hotblast stove (14), burner blower (1), burner (15), air door, measuring sensor, the inside of described hotblast stove (14) is provided with to cut off and hotblast stove is divided into combustion chamber and mixing section, and described burner (15) is arranged on combustion chamber; Pipeline between described burner blower (1) and burner (15) is provided with exhaust-valve (2), quick closing damper (3) is provided with between described exhaust-valve (2) and burner (15), when after hotblast stove flame failure protection action, this quick closing damper (3) quick closedown, prevents oxygen amount in stove from rising suddenly; Pipeline between described quick closing damper (3) and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, described Flow-rate adjustment pipeline is provided with Flow-rate adjustment air door (4), described oxygen flow regulation pipeline is provided with oxygen flow regulation air door (5);
Also include the quick-closing valve (6) be arranged on combustion-supporting natural gas line, natural gas line between described quick-closing valve (6) and described burner (15) is divided into two, be respectively combustion-supporting natural gas line and ignited natural gas pipeline, described combustion-supporting natural gas line is also provided with combustion-supporting natural gas adjusting valve (7), described ignited natural gas pipeline is also provided with ignited natural gas variable valve (8), above-mentioned two valves are regulated according to fire box temperature, remain that fire box temperature is between 800 to 950 degrees Celsius, ignited natural gas variable valve (8) is often opened, play pilot burner effect.
2. hot blast stove system as claimed in claim 1, it is characterized in that, pyrolysis gas enters burner by pyrolysis gas pipeline, described pyrolysis gas pipeline is provided with damper (9), chamber temperature measuring point (11) is provided with in the combustion chamber of described hotblast stove, for monitoring chamber temperature, keep chamber temperature between 800 to 950 degrees Celsius, adjust the pyrolysis tolerance entering burner hearth according to the feedback of chamber temperature measuring point (11) in time, prevent the too low hotblast stove of chamber temperature from stopping working.
3. hot blast stove system as claimed in claim 1, it is characterized in that, mixing wind enters the mixing section of hotblast stove by mixing wind pipeline, described mixing wind pipeline is provided with damper (10), system hot blast temperature measuring point (13) is provided with in the mixing section of described hotblast stove, the hot blast temperature of system is entered with monitoring, make the hot blast temperature of the system of entering meet coal drying, pyrolytic process needs, enter the temperature of system hot blast according to the Temperature displaying accurate adjustment entering system hot blast temperature measuring point (13).
4. the method for controlling combustion according to described hot blast stove system arbitrary in claims 1 to 3, it is characterized in that, step one, hotblast stove is lighted a fire, by starting burner blower (1), open quick closing damper (3), Sweet natural gas quick-closing valve (6), turn-on flow rate damper (4) and ignited natural gas variable valve (8), initial igniter is lighted a fire; Step 2, hotblast stove heats up, and regulate combustion-supporting natural gas adjusting valve (7) to start to heat up, adjust flux damper (4) fine adjustment air compares 15:1 with combustion-supporting Sweet natural gas; Step 3, stable burning, after system hot blast temperature reaches design temperature, regulates mixing wind damper (10) to maintain system hot blast temperature according to system hot blast temperature measuring point (13) feedback temperature and stablizes.
5. the method for controlling combustion of hot blast stove system as claimed in claim 4, it is characterized in that, in step 3, along with the carrying out of burning, system hot blast temperature can rise, and there is Low Temperature Thermal to vent one's spleen generation gradually, progressively open described low temperature pyrogenation gas damper (9), open large combustion-supporting natural gas adjusting valve (7) according to chamber temperature measuring point (11) Temperature Feedback and Flow-rate adjustment air door (4) ensures flameholding.
6. the method for controlling combustion of hot blast stove system as claimed in claim 5, is characterized in that, according to the feedback of oxygen amount measuring point (12), by regulating oxygen flow regulation air door (5) Controlling System hot blast oxygen amount below 1%.
7. the method for controlling combustion of hot blast stove system as claimed in claim 5, it is characterized in that, along with main device Low Temperature Thermal is vented one's spleen the increase of output, progressively open large low temperature pyrogenation gas damper (9), combustion-supporting natural gas adjusting valve (7), Flow-rate adjustment air door (4), oxygen flow regulation air door (5) to increase hotblast stove thermal load until main device oepration at full load.
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| CN201410227557.9A CN103981319B (en) | 2014-05-27 | 2014-05-27 | The method for controlling combustion of a kind of hot blast stove system and correspondence thereof |
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| CN201410227557.9A CN103981319B (en) | 2014-05-27 | 2014-05-27 | The method for controlling combustion of a kind of hot blast stove system and correspondence thereof |
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| CN103981319B true CN103981319B (en) | 2015-12-09 |
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| CN104805247B (en) * | 2015-05-18 | 2017-03-08 | 上海联达节能科技有限公司 | A kind of energy-conservation regulation and control method of blast funnace hot blast stove combustion fan |
| CN105238899B (en) * | 2015-09-30 | 2017-11-21 | 北京首钢国际工程技术有限公司 | Efficient low-discharging high temperature low oxygen hot blast furnace |
| CN106403277A (en) * | 2016-10-20 | 2017-02-15 | 内蒙古京能锡林煤化有限责任公司 | Oxygen-enriched staged combustion hot-blast stove suitable for various fuel sources |
| CN108826353A (en) * | 2018-03-21 | 2018-11-16 | 长沙卡特尔环保科技有限公司 | A kind of combustion-supporting control method of natural gas boiler |
| CN109956640A (en) * | 2019-03-28 | 2019-07-02 | 北京云水浩瑞环境科技有限公司 | The system for handling sludge |
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| CN100395352C (en) * | 2005-06-27 | 2008-06-18 | 天津天铁冶金集团有限公司 | Hot blast stove burning method |
| CN201678693U (en) * | 2010-03-31 | 2010-12-22 | 宝钢集团新疆八一钢铁有限公司 | Oxygen-enriched blending combustion device of hot blast heater |
| CN103451342B (en) * | 2013-09-05 | 2015-07-08 | 鞍钢股份有限公司 | Device and method for increasing temperature of blast furnace hot air |
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