CN106282467B - 一种铁矿粉煤基生产直接还原铁设施及方法 - Google Patents
一种铁矿粉煤基生产直接还原铁设施及方法 Download PDFInfo
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- CN106282467B CN106282467B CN201610924621.8A CN201610924621A CN106282467B CN 106282467 B CN106282467 B CN 106282467B CN 201610924621 A CN201610924621 A CN 201610924621A CN 106282467 B CN106282467 B CN 106282467B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nMzAwcHgnIGhlaWdodD0nMzAwcHgnIHZpZXdCb3g9JzAgMCAzMDAgMzAwJz4KPCEtLSBFTkQgT0YgSEVBREVSIC0tPgo8cmVjdCBzdHlsZT0nb3BhY2l0eToxLjA7ZmlsbDojRkZGRkZGO3N0cm9rZTpub25lJyB3aWR0aD0nMzAwJyBoZWlnaHQ9JzMwMCcgeD0nMCcgeT0nMCc+IDwvcmVjdD4KPHRleHQgeD0nMTM4JyB5PScxNzAnIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6NDBweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiMzQjQxNDMnID5GPC90ZXh0Pgo8dGV4dCB4PScxNjUuNicgeT0nMTcwJyBjbGFzcz0nYXRvbS0wJyBzdHlsZT0nZm9udC1zaXplOjQwcHg7Zm9udC1zdHlsZTpub3JtYWw7Zm9udC13ZWlnaHQ6bm9ybWFsO2ZpbGwtb3BhY2l0eToxO3N0cm9rZTpub25lO2ZvbnQtZmFtaWx5OnNhbnMtc2VyaWY7dGV4dC1hbmNob3I6c3RhcnQ7ZmlsbDojM0I0MTQzJyA+ZTwvdGV4dD4KPC9zdmc+Cg== data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 115
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound data:image/svg+xml;base64,<?xml version='1.0' encoding='iso-8859-1'?>
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- 239000003245 coal Substances 0.000 title claims abstract description 67
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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Abstract
一种铁矿粉煤基生产直接还原铁的设施及方法，属于生产直接还原铁的煤基法。其工艺过程包含以下步骤：（1）铁矿粉喂料进入多级预热器，与高温烟气在多级预热器内逆向流动，完成铁矿粉的快速干燥预热和高温烟气的冷却；（2）高温铁矿粉和还原焦一同进入还原回转窑形成矿焦混合料，燃烧器为回转窑燃烧提供高温气流，矿焦混合料经升温还原形成铁粉混合料；（3）铁粉混合料和还原煤同时经连接器进入冷却回转窑，完成铁粉冷却和还原煤焦化，形成铁焦混合料；（4）铁焦混合料经筛分磁选，分离出还原焦、直接还原铁、渣料，还原焦作为还原剂供给还原回转窑。该方法铁粉冷却和还原剂的制备结合起来，产能规模大，成本低，热量利用率高。
Description
一种铁矿粉煤基生产直接还原铁设施及方法
技术领域
[0001]本发明涉及一种生产直接还原铁的设施及方法，特别是涉及一种铁矿粉煤基生产 直接还原铁的设施及方法。
背景技术
[0002]直接还原铁作为我国钢铁冶炼的重要原料，日益受到钢铁企业的青睐。直接还原 铁的生产可分为气基法和煤基法两类，由于我国天然气资源缺乏、煤制气工艺复杂、成本高 昂，且气基法技术受国外垄断，难以适合我国国情。我国主流煤基法工艺为回转窑还原球团 矿工艺，原料经过烘干粉磨、加湿造球、球团烧结、球团冷却、回转窑加热和还原的工艺环 节，原料存在多次升温和降温，能耗浪费严重，此外，煤灰与还原过程中间产物容易形成低 熔点共融物，导致回转窑结圈，窑况顺行困难，因此，主流煤基法产量规模偏小，成本偏高， 对还原煤的品质要求严格，已成为困扰行业技术进步的难题，探索适合我国国情的煤基生 产直接还原铁的方法势在必行。
发明内容
[0003]本发明的目的在于克服回转窑煤基法生产直接还原铁存在能耗高、产量低、工况 不顺、成本高的缺点，提供一种铁矿粉煤基生产直接还原铁的方法。
[0004]本发明的目的是这样实现的:铁矿粉煤基直接还原铁包括还原铁设施和还原铁方 法；
[0005]所述的还原铁设施包括:带式运输机、提升式运输机、多级预热器、还原回转窑、连 接器、冷却回转g、锁风阀、筛分机、磁选机、引风机、收尘器、高温风机、燃烧器和预燃室;提 升式运输机出料口与多级预热器的顶部预热器入口连接;多级预热器底部出料口与还原回 转窑窑尾连接；多级预热器的底部预热器通过预燃室与还原回转窑窑尾连接，还原回转窑 窑头通过连接器与冷却回转窑入料端连接;还原回转窑摇头设有燃烧器;冷却回转窑出料 端设有锁风阀，锁风阀出料口与筛分机入料口连接;筛分机筛上物出料口通过带式运输机 与还原回转窑窑尾连接;筛分机筛下物出料口与磁选机入料口连接;高温风机进风口通过 管路与还原回转窑窑尾连接;高温风机出风口通过管路分别与收尘器和燃烧器连接;收尘 器出风口通过引风机外排。
[0006]所述的还原回转窑长度为40m〜60m的短窑，窑径为3m〜5m，窑内全长铺设高温耐 材。
[0007] 所述的冷却回转窑为单一长窑或串联的多段短窑;所述的单一长窑为等径长窑， 窑径为2m〜4m，长度为80m〜120m，窑内入料端内设高温耐材，铺设长度为窑长的1/3〜1/2， 剩余长度为裸露的钢板窑壁，窑的出料端设置窑外水冷冷却段或风冷冷却段，冷却段长度 为窑长的1/3〜1/2;所述的串联的多段短窑为不等径窑且沿料流前进方向窑径逐段增大， 总窑长、高温耐材铺设长度、冷却段长度与单一长窑一致。
[0008] 所述的原还铁方法:铁矿粉煤基直接还原铁包括以下步骤：
[0009]步骤1、铁矿粉经提升运输机从顶部喂料进入多级预热器，同时将预燃室的高温烟 气引入多级预热器底部，铁矿粉与高温烟气在多级预热器内逆向流动，完成铁矿粉的快速 干燥预热和高温烟气的冷却，经预热器顶部排出进入高温风机的烟气温度小于300°C，预热 器底部铁矿粉出料温度为80CTC〜90(TC ;多级预热器排列方式为竖向单列或竖向双列，级 数为4级或5级。
[0010]步骤2、800°C〜900°C的铁矿粉和筛分机筛出的还原焦一同进入还原回转窑尾部， 形成矿焦混合料;燃料煤和来自高温风机的热风通过窑头燃烧器喷入窑内燃烧，形成1100 °C〜120(TC的窑内高温气流;矿焦混合料在向窑头缓慢前进的过程中，一方面受高温气流 辐射继续升温，另一方面与窑内还原剂反应完成铁矿粉的还原，形成直接还原铁的高温铁 粉料，出窑料温1 〇〇〇°C〜1100°C。
[0011] 所述的窑内还原剂的来源包括以下方面：
[0012] 来源A、还原焦中的固定碳；
[0013] 来源B、连接器和冷却窑中的还原煤在焦化过程中释放的气体，包括H2、C0、⑶2、 CH4、H20;
[0014] 来源C、还原焦中的固定碳与来源B中的C〇2发生C+C〇2=2CO反应，生成的C0;
[0015] 来源D、来源B中的CH4和窑内C02发生CH4+C〇2=2CO+2H2反应，生成的C0和H2;
[0016] 来源E、来源B中的CH4和水蒸汽发生CH4+H20=C0+3H2反应，生成的CO和H2。
[0017] 步骤3、高温铁粉料和还原煤同时经连接器进入冷却回转窑，还原煤在冷却铁粉料 的同时逐渐被焦化转变为还原焦，形成铁焦混合料，经过冷却回转窑末端强冷段进入锁风 阀，由锁风阀排至筛分机;锁风阀排出的铁焦混合料温度小于10(TC;冷却回转窑强冷段为 钢板内壁无内衬的裸露窑体，钢板外壁采用水或风强行冷却。
[0018] 步骤4、铁焦混合料经筛分机筛分，筛上物为还原焦，还原焦通过带式运输机喂入 还原回转窑窑尾，筛下物为铁粉料;筛分机的筛分粒度为lcm。
[0019] 步骤5、筛分铁粉料进入磁选机，选出直接还原铁，剩余的为渣料。
[0020] 步骤1中，所述的铁矿粉的粒径小于0.3mm，含水量小于10%，总铁品位30%〜50%;预 燃室的高温烟气的温度为800°C〜1000°C;所述的多级预热器排列方式为竖向单列或竖向 双列，级数为4级或5级。
[0021] 步骤3中，所述的还原煤的粒度2cm〜3cm，温度为大气环境温度；所述的冷却回转 窑强冷段为钢板内壁无内衬的裸露窑体，钢板外壁采用水或风强行冷却。
[0022] 步骤4中，所述的筛分机的筛分粒度为lcm。
[0023] 有益效果及优点，本发明与传统煤基法相比，具有如下有效效果和优点：
[0024] 1、还原煤可采用高挥发性的廉价低阶煤，拓展了传统煤基法的用煤范围，我国低 阶煤分布广泛，有利于降低原料成本。
[0025] 2、原料在整个工艺流程中，仅经历一次连续升温降温，与传统的多次升温降温循 环相比，大大节省了系统能耗。
[0026] 3、采用还原煤冷却高温铁粉料的工艺方式，产生了如下有益效果：
[0027] A、利用了铁粉料余热将还原煤转变为还原焦，提高了固体还原剂的品质。
[0028] B、利用了铁粉料余热将还原煤进行干燥，降低了还原煤原料对水分的限制。
[0029] C、还原煤焦化过程中直接挥发出还原性气体包括⑶，增加了还原剂的种类，保障 了窑内还原气氛。
[0030] D、还原煤焦化过程中挥发出的部分气体包括CH4、C〇2、水蒸汽可在窑内进一步反应 生产还原性更好的气体还原剂包括H2和C0，增强了铁矿粉的还原效果。
[0031] E、还原煤焦化产生的气体在还原回转窑部分参与燃烧，可降低燃料煤用量，节省 成本。
[0032] F、充分利用了煤制气，无需采用煤制气专用设备。
[0033] 4、冷却回转窑内壁主体为裸露钢板，仅在高温段铺设内衬材料，窑体重量较小，制 作成本低廉。
[0034] 5、还原回转窑、连接器、冷却回转窑、锁风阀串联布置，一方面易于密闭防止有害 气体外泄，还原气氛保障可靠，避免了铁粉的二次氧化;另一方面未能充分还原的铁矿粉可 在冷却回转窑内继续还原，延长了还原时间，提高了还原率。
[0035] 6、冷却回转窑设有强冷段，出料温度低，避开了铁粉氧化活跃的温度范围，产品质 直稳走。
[0036] 7、还原回转窑窑尾设有预燃室，耗尽了高温烟气中剩余的C0，消除了多级预热器 中C0爆炸或外泄的隐患。
[0037] S、采用的铁矿粉粒度为0.3mm，远大于传统粉磨粒度0.08mm，降低了原料的加工能 耗，降低了原料制作成本。
[0038] 9、采用多级预热器粉态进料，产生了如下有益效果：
[0039] A、节省了传统煤基法造球和烧结的工艺环节，缩短了工艺流程。
[0040] B、充分发挥了多级预热器换热速度快，处理量大的优势，为提高系统产能规模奠 定基础。
[0041] C、将原料的预热从回转窑内分离出来，回转窑可采用短窑，降低了造窑成本，避免 了传统煤基法因将原料预热、升温、还原集中在一个回转窑内，导致单个回转窑负担多种功 能，负荷过于集中，窑况难以调节的弊端。
[0042] 1〇、筛分机可将还原煤焦化过程中产生的煤灰与还原焦分离，提高了还原焦的纯 度，避免了煤灰进入还原回转窑形成低熔点共融物，保障了窑况的顺行。
[0043] 11、系统设置了封闭了的收尘系统，环境友好。
[0044] I2、高温风机的热风部分用于燃烧器，提高了燃料煤的燃烧效率，也为其他原料的 烘干提供了热风来源，提高了系统的热能利用率。
附图说明
[0045]图1为本发明的流程示意图。
具体实施方式
[0046]铁矿粉煤基直接还原铁包括还原铁设施和还原铁方法；
[0047]所述的还原铁设施包括:带式运输机、提升式运输机、多级预热器、还原回转窑、连 接器、冷却回转窑、锁风阀、筛分机、磁选机、引风机、收尘器、高温风机、燃烧器和预燃室;提 升式运输机出料口与多级预热器的顶部预热器入口连接;多级预热器底部出料口与还原回 转窑窑尾连接；多级预热器的底部预热器通过预燃室与还原回转窑窑尾连接，还原回转窑 窑头通过连接器与冷却回转窑入料端连接;还原回转窑摇头设有燃烧器;冷却回转窑出料 端设有锁风阀，锁风阀出料口与筛分机入料口连接;筛分机筛上物出料口通过带式运输机 与还原回转窑窑尾连接;筛分机筛下物出料口与磁选机入料口连接;高温风机进风口通过 管路与还原回转窑窑尾连接;高温风机出风口通过管路分别与收尘器和燃烧器连接;收尘 器出风口通过引风机外排。
[0048]所述的还原回转窑长度为40m〜60m的短窑，窑径为3m〜5m，窑内全长铺设高温耐 材。
[0049]所述的冷却回转窑为单一长窑或串联的多段短窑;所述的单一长窑为等径长窑， 窑径为2m〜4m，长度为80m〜l2〇m，窑内入料端内设高温耐材，铺设长度为窑长的1/3〜1/2， 剩余长度为裸露的钢板窑壁，窑的出料端设置窑外水冷冷却段或风冷冷却段，冷却段长度 为窑长的1/3〜1/2;所述的串联的多段短窑为不等径窑且沿料流前进方向窑径逐段增大， 总窑长、尚温耐材铺设长度、冷却段长度与单一长窖一致。
[0050]所述的原还铁方法:铁矿粉煤基直接还原铁包括以下步骤：
[0051]步骤1、铁矿粉经运输机从顶部喂料进入多级预热器，同时将预燃室的高温烟气引 入多级预热器底部，铁矿粉与高温烟气在多级预热器内逆向流动，完成铁矿粉的快速干燥 预热和高温烟气的冷却，经预热器顶部排出进入高温风机的烟气温度小于300。(：，预热器底 部铁矿粉出料温度为800°C〜900 °C。多级预热器排列方式为竖向单列或竖向双列，级数为4 级或5级；
[0052] 步骤2、800°C〜900°C的铁矿粉和筛分机筛出的还原焦一同进入还原回转窑尾部， 形成矿焦混合料;燃料煤和来自高温风机的热风通过窑头燃烧器喷入窑内燃烧，形成1100 °C〜1200°C的窑内高温气流;矿焦混合料在向窑头缓慢前进的过程中，一方面受高温气流 辐射继续升温，另一方面与窑内还原剂反应完成铁矿粉的还原，形成直接还原铁的高温铁 粉料，出窑料温1 〇〇〇 °C〜1100 °C。
[0053] 所述的窑内还原剂的来源包括以下方面：
[0054] 来源A、还原焦中的固定碳；
[0055]来源B、连接器和冷却窑中的还原煤在焦化过程中释放的气体，包括H2、CO、C02、 CH4、H20;
[0056] 来源C、还原焦中的固定碳与来源B中的C02发生C+C02=2C0反应，生成的CO;
[0057] 来源D、来源B中的CH4和窑内C02发生CH4+C〇2=2CO+2H2反应，生成的CO和H2;
[0058] 来源E、来源B中的CH4和水蒸汽发生CH4+H20=C0+3H2反应，生成的C0和H2。
[0059] 步骤3、高温铁粉料和还原煤同时经连接器进入冷却回转窑，还原煤在冷却铁粉料 的同时逐渐被焦化转变为还原焦，形成铁焦混合料，经过冷却回转窑末端强冷段进入锁风 阀，由锁风阀排至筛分机;锁风阀排出的铁焦混合料温度小于100°C ;冷却回转窑强冷段为 钢板内壁无内衬的裸露窑体，钢板外壁采用水或风强行冷却。
[0060]步骤4、铁焦混合料经筛分机筛分，筛上物为还原焦，还原焦喂入还原回转窑窑尾， 筛下物为铁粉料;筛分机的筛分粒度为lcm。
[0061] 步骤5、筛分铁粉料进入磁选机，选出直接还原铁，剩余的为渣料。
[0062] 步骤1中，所述的铁矿粉的粒径小于0 • 3圓，含水量小于10%，总铁品位30%〜50%;预 燃室的高温烟气的温度为8〇〇°C〜1000°C;所述的多级预热器排列方式为竖向单列或竖向 双列，级数为4级或5级。
[0063]步骤3中，所述的还原煤的粒度2cm〜3cm，温度为大气环境温度;所述的冷却回转 窑强冷段为钢板内壁无内衬的裸露窑体，钢板外壁采用水或风强行冷却。
[0064] 步骤4中，所述的筛分机的筛分粒度为lctn。
[0065]实施例1:磁铁矿粉煤基生产直接还原铁的方法：
[0066]将运输机、预热器、还原回转窑、连接器、冷却窑、锁风阀、筛分机、磁选机串联布置 并配置引风机、收尘器、高温风机，还原回转窑设有窑头燃烧器和窑尾预燃室，包括以下步 骤：
[0067]步骤1、铁矿粉经运输机从顶部喂料进入多级预热器，同时将预燃室的高温烟气引 入多级预热器底部，铁矿粉与高温烟气在多级预热器内逆向流动，完成铁矿粉的快速干燥 预热和高温烟气的冷却，经预热器顶部排出进入高温风机的烟气温度小于300-C，预热器底 部铁矿粉出料温度为850°C。多级预热器排列方式为5级竖向双列。所述的铁矿粉粒径小于 0.3mm，含水量8%，总铁品位42%;所述的高温烟气为950°C。
[0068]步骤2、8f5(TC的铁矿粉和筛分机筛出的还原焦一同进入还原回转窑尾部，形成矿 焦混合料。燃料煤和来自高温风机的热风通过窑头燃烧器喷入窑内燃烧，形成1100。(：〜 1200°C的窑内高温气流。矿焦混合料在向窑头缓慢前进的过程中，一方面受高温气流辐射 继续升温，另一方面与窑内还原剂反应完成铁矿粉的还原，形成直接还原铁的高温铁粉料， 出窑料温100(TC〜105CTC。还原剂的来源包括以下方面：
[0069] A、还原焦中的固定碳。
[0070] B、连接器和冷却窑中的还原煤在焦化过程中释放的气体，包括h2、⑶、⑶2、CH4、 h2〇〇
[0071 ] c、还原焦中的固定碳与B来源中的C〇2发生C+C02=2C0反应，生成的C0。
[0072] D、B来源中的CH4和窑内C〇2发生CH4+C〇2=2CO+2H2反应，生成的C0和H2。
[OO73] E、B来源中的CH4和水蒸汽发生CH4+H20=C0+3H2反应，生成的C0和H2。
[0074]步骤3、高温铁粉料和还原煤同时经连接器进入冷却回转窑，还原煤在冷却铁粉料 的同时逐渐被焦化转变为还原焦，形成铁焦混合料，经过冷却回转窑末端强冷段进入锁风 阀，由锁风阀排至筛分机。锁风阀排出的铁焦混合料温度小于9〇。冷却回转窑强冷段为钢 板内壁无内衬的裸露窑体，钢板外壁采用水强行冷却。所述的高温铁粉料的温度为loocrc 〜1050°C;所述的还原煤的粒度为2.5〇11，温度为25。(：。
[0075]步骤4、铁焦混合料经筛分机筛分，筛上物为还原焦，还原焦喂入还原回转窑窑尾， 筛下物为铁粉料。筛分机的筛分粒度为lcm。
[OO76]步骤5、筛分铁粉料进入磁选机，选出直接还原铁，测定直接还原铁的金属化率为 94%，剩余的为渣料。
Claims (10)
1. 一种铁矿粉煤基生产直接还原铁的设施，其特征是:还原铁设施包括：带式运输机、 提升式运输机、多级预热器、还原回转窑、连接器、冷却回转窑、锁风阀、筛分机、磁选机、弓丨 风机、收尘器、高温风机、燃烧器和预燃室;提升式运输机出料口与多级预热器的顶部预热 器入口连接;多级预热器底部出料口与还原回转窑窑尾连接;多级预热器的底部预热器通 过预燃室与还原回转窑窑尾连接，还原回转窑窑头通过连接器与冷却回转窑入料端连接； 还原回转窑窑头设有燃烧器;冷却回转窑出料端设有锁风阀，锁风阀出料口与筛分机入料 口连接;筛分机筛上物出料口通过带式运输机与还原回转窑窑尾连接;筛分机筛下物出料 口与磁选机入料口连接;高温风机进口通过管路与多级预热器连接;高温风机出风口通过 管路分别与收尘器和燃烧器连接;收尘器出风口通过引风机外排。
2. 根据权利要求1所述的一种铁矿粉煤基生产直接还原铁的设施，其特征是:所述的还 原回转亩长度为40m〜60m的短窜，窑径为3m〜5m，亩内全长铺设尚温耐材。
3. 根据权利要求1所述的一种铁矿粉煤基生产直接还原铁的设施，其特征是:所述的冷 却回转窑为单一长窑或串联的多段短窑。
4. 根据权利要求3所述的一种铁矿粉煤基生产直接还原铁的设施，其特征是:所述的单 一长S为等径长窑，窖径为2m〜4m，长度为80m〜120m，亩内入料端内设高温耐材，铺设长度 为窑长的1/3〜1/2,剩余长度为裸露的钢板窑壁，窑的出料端设置窑外水冷冷却段或风冷 冷却段，冷却段长度为窑长的1/3〜1/2。
5.根据权利要求4所述的一种铁矿粉煤基生产直接还原铁的设施，其特征是:所述的串 联的多段短窑为不等径窑且沿料流前进方向窑径逐段增大，总窑长、高温耐材铺设长度、冷 却段长度与单一长窑一致。
6.—种铁矿粉煤基生产直接还原铁的方法，其特征在于:铁矿粉煤基直接还原铁的生 产方法包括以下步骤： 步骤1、铁矿粉经运输机从顶部喂料进入多级预热器，同时将预燃室的高温烟气引入多 级预热器底部，多级预热器的底部预热器通过预燃室与还原回转窑窑尾连接;铁矿粉与高 温烟气在多级预热器内逆向流动，完成铁矿粉的快速干燥预热和高温烟气的冷却，经预热 器顶部排出进入高温风机的烟气温度小于300°C，预热器底部铁矿粉出料温度为800°C〜 900。。； 步骤2、8〇0°C〜900°C的铁矿粉和筛分机筛出的还原焦一同进入还原回转窑尾部，形成 矿焦混合料;燃料煤和来自高温风机的热风通过窑头燃烧器喷入窑内燃烧，形成ll〇(TC〜 1200°C的窑内高温气流;矿焦混合料在向窑头缓慢前进的过程中，一方面受高温气流辐射 继续升温，另一方面与窑内还原剂反应完成铁矿粉的还原，形成直接还原铁的高温铁粉料， 出窑料温1 〇〇〇 °C〜1100 °c; 步骤3、高温铁粉料和还原煤同时经连接器进入冷却回转窑，还原煤在冷却铁粉料的同 时逐渐被焦化转变为还原焦，形成铁焦混合料，经过冷却回转窑末端强冷段进入锁风阀，由 锁风阀排至筛分机;锁风阀排出的铁焦混合料温度小于1 〇〇 r; 步骤4、铁焦混合料经筛分机筛分，筛上物为还原焦，还原焦喂入还原回转窑窑尾，筛下 物为铁粉料； 步骤5、筛分铁粉料进入磁选机，选出直接还原铁，剩余的为渣料。
7.根据权利要求6所述的一种铁矿粉煤基生产直接还原铁的方法，其特征是:步骤丨中， 所述的铁矿粉的粒径小于0 • 3mm，含水量小于10%，总铁品位30%〜50%;预燃室的高温烟气的 温度为8〇〇°C〜1000 °C;所述的多级预热器排列方式为竖向单列或竖向双列，级数为4级或5 级。
8.根据权利要求6所述的一种铁矿粉煤基生产直接还原铁的方法，其特征是:步骤2中， 所述的窑内还原剂的来源包括以下方面： 来源A、还原焦中的固定碳； 来源B、连接器和冷却窑中的还原煤在焦化过程中释放的气体，包括H2、CO、CO2、CH4、H20; 来源C、还原焦中的固定碳与来源B中的C〇2发生C+C〇2=2CO反应，生成的CO; 来源D、来源B中的CH4和窑内C〇2发生CH4+C02=2C0+2H2反应，生成的CO和H2; 来源E、来源B中的CH4和水蒸汽发生CH4+H20=C0+3H2反应，生成的CO和H2。
9.根据权利要求6所述的一种铁矿粉煤基生产直接还原铁的方法，其特征是:步骤3中， 所述的还原煤的粒度2cm〜：3cm，温度为大气环境温度;所述的冷却回转窑强冷段为钢板内 壁无内衬的裸露窑体，钢板外壁采用水或风强行冷却。
10.根据权利要求6所述的一种铁矿粉煤基生产直接还原铁的方法，其特征是：步骤4 中，所述的筛分机的筛分粒度为1cm。
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| CN105648132A (zh) * | 2016-01-25 | 2016-06-08 | 唐竹胜 | 一种煤基隔焰式回转窑及低温深度快速还原铁的方法 |
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| CN104212931A (zh) * | 2014-08-21 | 2014-12-17 | 广西高澎矿业科技有限公司 | 一种利用回转窑深度还原生产金属铁粉的方法 |
| CN204661750U (zh) * | 2015-02-04 | 2015-09-23 | 石家庄新华能源环保科技股份有限公司 | 一种铁电焦联合生产的间壁回转窑 |
| CN104862440A (zh) * | 2015-03-19 | 2015-08-26 | 中南大学 | 一种低品位铁矿直接还原的方法 |
| CN105648132A (zh) * | 2016-01-25 | 2016-06-08 | 唐竹胜 | 一种煤基隔焰式回转窑及低温深度快速还原铁的方法 |
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