CN110157845A - 一种高炉矿粉喷吹方法及系统 - Google Patents
一种高炉矿粉喷吹方法及系统 Download PDFInfo
- Publication number
- CN110157845A CN110157845A CN201910549245.2A CN201910549245A CN110157845A CN 110157845 A CN110157845 A CN 110157845A CN 201910549245 A CN201910549245 A CN 201910549245A CN 110157845 A CN110157845 A CN 110157845A
- Authority
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- Prior art keywords
- blast furnace
- outlet
- injection
- miberal powder
- powder
- Prior art date
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- 239000000843 powder Substances 0.000 title claims abstract description 76
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000007664 blowing Methods 0.000 title claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 54
- 239000007924 injection Substances 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 27
- 239000002817 coal dust Substances 0.000 claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- 239000003345 natural gas Substances 0.000 claims abstract description 14
- 239000000779 smoke Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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]
Abstract
本发明公开了一种高炉矿粉喷吹方法,该方法为:返矿送入粉碎机粉碎成矿粉,并经烟气加热后过滤;过滤后的矿粉与焦炉煤气/天然气,以及加热后的煤粉汇流进入分配器,经分配器后通过喷吹管喷吹进入高炉;过滤后的大部分烟气回流至加热炉,与炉内烟气混合后再次送入粉碎机内加热矿粉;过滤后的另一部分烟气与低温的煤粉换热,加热煤粉后由烟囱排出。本发明还提供了一种高炉矿粉喷吹系统。本发明的有益效果为:对进入高炉的矿粉和煤粉进行加热处理,降低了通入高炉内的矿粉的含水量,保证了矿粉及煤粉的安全输送,同时也避免了矿粉含水量过高影响高炉的正常生产,安全可靠。
Description
技术领域
本发明涉及高炉炼铁技术领域,具体涉及一种高炉矿粉喷吹方法及系统。
背景技术
随着炼铁技术的不断进步,高炉喷吹矿粉越来越受到广泛关注并朝着可行的方向发展。高炉喷吹矿粉最有利的矿粉来源在于高炉原料供应系统的返矿。返矿其总量占高炉入炉矿的6%~15%。高炉采用小矿回收工艺时,高炉返矿比例较低。要求烧结矿入炉粒度较大的高炉,其返矿比例较高,可高达入炉矿的18%。高炉返矿含水量、粒度不均匀,采用气力输送方式输送时,存在影响生产作业率的隐患;同时,返矿含水对高炉生产不利。
发明内容
本发明的目的在于,针对现有技术的不足,提供一种安全可靠、节能减排的高炉喷吹矿粉的工艺流程。
本发明采用的技术方案为:一种高炉矿粉喷吹方法,该方法为:返矿送入粉碎机粉碎成矿粉,并经烟气加热后过滤;过滤后的矿粉与焦炉煤气/天然气,以及加热后的煤粉汇流进入分配器,经分配器后通过喷吹管喷吹进入高炉;过滤后的大部分烟气回流至加热炉,与炉内烟气混合后再次送入粉碎机内加热矿粉;过滤后的另一部分烟气与低温的煤粉换热,加热煤粉后由烟囱排出。
按上述方案,进入高炉的矿粉和煤粉温度为200~250℃。
本发明还提供了一种高炉矿粉喷吹系统,包括返矿仓、粉碎机、加热炉、高温滤袋、分配器、煤粉喷吹管和粉矿喷吹管,所述返矿仓通过给料机与粉碎机的进料口连通,粉碎机底部的烟气入口与加热炉的烟气出口连通,粉碎机顶部的出口与高温滤袋连通,高温滤袋的矿粉出口通过管道与焦炉煤气/天然气管道汇流至粉矿喷吹管,粉矿喷吹管和煤粉喷吹管均与分配器的入口连通,分配器的出口通过喷吹支管与高炉内部连通。
按上述方案,所述矿粉喷吹系统还设有加热器和排气风机,所述高温滤袋的烟气出口通过循环分风机与加热器的热源入口连通,加热器的热源出口与排气风机的入口连通,排气风机的出口与烟囱底部入口连通;所述加热器的冷源入口与煤粉喷吹管道连通,加热器的冷源出口与分配器的入口连通。
按上述方案,所述循环风机的出口通过尾气循环管道与加热炉连通。
按上述方案,所述矿粉喷吹系统还配置有粉矿仓和喷吹罐,所述粉矿仓的入口通过管道与高温滤袋的矿粉出口相连,粉矿仓的出口通过管道与喷吹罐的入口相连,喷吹罐的出口与通过管道与焦炉煤气/天然气管道汇流至粉矿喷吹管。
本发明的有益效果为:
1、本发明所述方法及系统利用燃烧高炉煤气产生的高温烟气对进入高炉的矿粉和煤粉进行加热处理,降低了通入高炉内的矿粉的含水量,保证了矿粉及煤粉的安全输送,同时也避免了矿粉含水量过高影响高炉的正常生产,安全可靠;
2、本发明利用将与矿粉换热后的部分烟气回收送入加热炉,与加热炉内的高温烟气混合后再次送入粉碎机内加热矿粉;与矿粉换热后的其他烟气与煤粉换热,这种方式充分利用了烟气热量,减少了烟气排放量,节能减排;
3、本发明中矿粉输送介质采用焦炉煤气或天然气,矿粉中的氧元素与可燃气密切接触,有利于焦炉煤气或天然气快速燃烧;
4、本发明将高炉喷吹矿粉与高炉喷吹煤粉有机结合,为提高喷吹矿粉量创造有利条件。
附图说明
图1为本发明一个具体实施例的结构示意图。
其中:1、返矿仓;2、给料机;3、粉碎机;4、加热炉;5、高温滤袋;6、循环风机;7、尾气循环管道;8、粉矿仓;9、喷吹罐;10、焦炉煤气/天然气管道;11、粉矿喷吹管;12、煤粉喷吹管;13、加热器;14、排气风机;15、烟囱;16、煤粉及矿粉输送管;17、分配器;18、喷吹支管;19、高炉。
具体实施方式
为了更好地理解本发明,下面结合附图和具体实施例对本发明作进一步地描述。
一种高炉矿粉喷吹方法,该方法为:返矿送入粉碎机3粉碎成矿粉,并经烟气加热后过滤,过滤后的矿粉与焦炉煤气/天然气,以及加热后的煤粉汇流进入分配器17,经分配器17后通过喷吹管喷吹进入高炉19;过滤后的大部分烟气回流至加热炉4,与炉内烟气混合后再次送入粉碎机3内加热矿粉;过滤后的另一部分烟气与低温的煤粉换热,加热煤粉后由烟囱15排出。
优选地,进入高炉19的矿粉和煤粉温度为200~250℃,有利于改善高炉19风口带燃烧,提高高炉19喷吹矿比。
如图1所示的一种高炉矿粉喷吹系统,包括返矿仓1、粉碎机3、加热炉4、高温滤袋5、分配器17、煤粉喷吹管12和粉矿喷吹管11,所述返矿仓1通过给料机2与粉碎机3的进料口连通,粉碎机3底部的烟气入口与加热炉4的烟气出口连通,粉碎机3顶部的出口与高温滤袋5连通,高温滤袋5的矿粉出口通过管道与焦炉煤气/天然气管道10汇流至粉矿喷吹管11,粉矿喷吹管11和煤粉喷吹管12均与分配器17的入口连通,分配器17的出口通过喷吹支管18与高炉19内部连通。本实施例中,粉矿喷吹管11和煤粉喷吹管12回流至煤粉及矿粉输送管16后再送至分配器17。分配器17可以是两个和多个并列。
优选地,所述矿粉喷吹系统还设有加热器13和排气风机14,所述高温滤袋5的烟气出口通过循环分风机与加热器13的热源入口连通,加热器13的热源出口与排气风机14的入口连通,排气风机14的出口与烟囱15底部入口连通;所述加热器13的冷源入口与煤粉喷吹管12道连通,加热器13的冷源出口与分配器17的入口连通。
优选地,所述循环风机6的出口通过尾气循环管道7与加热炉4连通。
优选地,所述矿粉喷吹系统还配置有粉矿藏和喷吹罐9,所述粉矿仓8的入口通过管道与高温滤袋5的矿粉出口相连,粉矿仓8的出口通过管道与喷吹罐9的入口相连,喷吹罐9的出口与通过管道与焦炉煤气/天然气管道10汇流至粉矿喷吹管11。本实施例中,喷吹罐9可以是双罐或三罐并列喷吹。
矿粉储存于返矿仓1中;给料机2根据粉碎机3的需求精确配给粉矿;加热炉4按粉碎机3要求的烟气温度和烟气量提高高温烟气;加热炉4燃烧采用高炉19煤气。本发明所述喷吹系统的工作原理为:
返矿经破碎机破碎后并加热到200℃~250℃成为合格的矿粉,由高温滤袋5收集后储存在粉矿仓8内;循环风机6将滤袋过滤后的部分烟气经尾气循环管道7送到加热炉4内,与加热炉4燃烧产生的烟气混合,混合烟气温度300℃~400℃(根据返矿的含湿量和矿粉所要求的温度来确定);混合烟气进入破碎机对矿粉进行加热,并将矿粉送到高温布袋。喷吹罐9接收来自粉矿仓8的矿粉,矿粉喷吹采用焦炉煤气或天然气输送;粉矿经喷吹管接煤粉输送管道。煤粉经煤粉喷吹管12送入加热器13,由自高温滤袋5流出的烟气加热,加热器13排出的烟气经排气风机14排入烟囱15;加热后的煤粉(温度为200℃~250℃)与粉矿在煤粉及矿粉输送管16内混合后送至分配器17;从分配器17出来的煤粉和矿粉经多根喷吹支管18送到高炉19风口,由喷枪送入高炉19;每个高炉19风口可以插一支喷枪,也可以插双枪。
最后应说明的是,以上仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,但是凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (6)
1.一种高炉矿粉喷吹方法,其特征在于,该方法为:返矿送入粉碎机粉碎成矿粉,并经烟气加热后过滤;过滤后的矿粉与焦炉煤气/天然气,以及加热后的煤粉汇流进入分配器,经分配器后通过喷吹管喷吹进入高炉;过滤后的大部分烟气回流至加热炉,与炉内烟气混合后再次送入粉碎机内加热矿粉;过滤后的另一部分烟气与低温的煤粉换热,加热煤粉后由烟囱排出。
2.如权利要求1所述的高炉矿粉喷吹方法,其特征在于,进入高炉的矿粉和煤粉温度为200~250℃。
3.一种高炉矿粉喷吹系统,其特征在于,包括返矿仓、粉碎机、加热炉、高温滤袋、分配器、煤粉喷吹管和粉矿喷吹管,所述返矿仓通过给料机与粉碎机的进料口连通,粉碎机底部的烟气入口与加热炉的烟气出口连通,粉碎机顶部的出口与高温滤袋连通,高温滤袋的矿粉出口通过管道与焦炉煤气/天然气管道汇流至粉矿喷吹管,粉矿喷吹管和煤粉喷吹管均与分配器的入口连通,分配器的出口通过喷吹支管与高炉内部连通。
4.如权利要求3所述的高炉矿粉喷吹系统,其特征在于,所述矿粉喷吹系统还设有加热器和排气风机,所述高温滤袋的烟气出口通过循环分风机与加热器的热源入口连通,加热器的热源出口与排气风机的入口连通,排气风机的出口与烟囱底部入口连通;所述加热器的冷源入口与煤粉喷吹管道连通,加热器的冷源出口与分配器的入口连通。
5.如权利要求3所述的高炉矿粉喷吹系统,其特征在于,所述循环风机的出口通过尾气循环管道与加热炉连通。
6.如权利要求3所述的高炉矿粉喷吹系统,其特征在于,所述矿粉喷吹系统还配置有粉矿仓和喷吹罐,所述粉矿仓的入口通过管道与高温滤袋的矿粉出口相连,粉矿仓的出口通过管道与喷吹罐的入口相连,喷吹罐的出口与通过管道与焦炉煤气/天然气管道汇流至粉矿喷吹管。
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