CN104792186B - 一种烧结烟气节能型脱硝系统 - Google Patents
一种烧结烟气节能型脱硝系统 Download PDFInfo
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- CN104792186B CN104792186B CN201510154410.6A CN201510154410A CN104792186B CN 104792186 B CN104792186 B CN 104792186B CN 201510154410 A CN201510154410 A CN 201510154410A CN 104792186 B CN104792186 B CN 104792186B
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- flue
- sintering
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- 238000005245 sintering Methods 0.000 title claims abstract description 99
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003546 flue gas Substances 0.000 title claims abstract description 63
- 239000002918 waste heat Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000000037 vitreous enamel Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- -1 sintering machine Chemical compound 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical compound 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- 238000000034 method Methods 0.000 abstract description 25
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- 239000003517 fume Substances 0.000 abstract 1
- 239000003595 mist Substances 0.000 abstract 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group 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[N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
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Classifications
-
- 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
- Y02P10/25—Process efficiency
-
- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
本发明公开一种烧结烟气节能型脱硝系统,包括脱硝装置、换热器、循环风机及加氨装置。本发明充分利用烧结工艺的余热,实现烧结烟气高效脱硝,并回收烟气余热。本发明可以大幅度降低烧结烟气氮氧化物排放量,提高烧结工艺的余热回收水平。
Description
技术领域
[0001]本发明涉及烧结工艺环保及节能系统,具体涉及一种用于钢铁企业烧结工艺的节能脱硝工艺及装置。
背景技术
[0002]目前,在钢铁生产过程中,烧结工序的能耗约占总能耗的12%,仅次于炼铁工序,位居第二,烧结工艺所排出的烟气中含有大量的氮氧化物,根据钢铁、球团工业大气污染物排放标准(GB28662-2-12),烧结烟气需进行脱硝处理。目前成熟的脱硝工艺为SCR法,所需烟气温度为300〜380°C,但烧结的烟气为100〜150°C,因此如直接对烧结烟气进行脱硝,则需要消耗大量煤气来加热烟气,将大幅增加烧结的能耗。“用于烧结过程中的在线脱硝方法”发明(CN1286314A),主要是在烧结生产的配料过程增加砂糖等粘结助剂,这种方法运行费用大大升高;“一种脱除烧结烟气中氮氧化物的方法”发明(CN101053749A),该方法在烧结混合料中加入含氨的化合物,所述的在烧结过程中含氨化物放出氨气,将烧结烟气中的氮氧化物还原为氮气,这种方法虽然可以脱除氮氧化物,但同样存在运行成本高问题。“烧结烟气脱硝及余热利用系统”发明(CN204202411U),主要是将烧结机机尾风箱高温烟气通过换热器,加热中前段风箱的烟气,从而达到进行SCR工艺脱硝的要求,对中前段风箱烟气进行脱硝,采用这种方法,由于烟气的热量有限,仅能对烧结工艺所产的约20%烟气量进行脱硝处理,另外在烧结机机尾风箱中的烟气所含的氮氧化物与中前段烟气含量相当。“一种烧结脱硝系统及其脱除氮氧化物的方法”发明(CN103157356A),采用的方法是在烧结过程中,将烧结机含氮氧化物浓度高的风箱烟气引出,通过加入天然气,返回对应的烧结料面,与烟气中的氮氧化物发生化学反应,从而实现脱硝,该方法运行成本较高,脱硝效率低。这是因为在烧结过程中,烧结烟气中的氮氧化物为燃料型,各风箱烟气的氮氧化物含量基本相同,采用天然气来还原氮氧化物效率较底,天然气仅能减少烟气中的热力型氮氧化物,烧结烟气中的氮氧化物含量很低。
发明内容
[0003]本发明的目的:就是为了克服现有技术中存在的不足,提供一种烧结烟气节能型脱硝系统。本发明是采用烧结烟气循环方法,将烟气中的氮氧化物进行附集,同时提高烧结烟气的温度,并通过回收低温环冷机的热废气,进一步提高烧结烟气的温度,从而低成本满足SCR脱硝的工艺要求,实现SCR工艺对烧结烟气进行脱硝,提高脱硝效率,并对脱硝的后的高温烟气进行余热回收。
[0004]技术方案:为解决上述技术问题,本发明的一种烧结烟气节能型脱硝系统,包括烧结机、环冷机、大烟道、循环风机、大烟道中前段分隔阀、烧结机中段风罩、烧结机后段风罩、脱硝烟道、大烟道中后段分隔阀、中高温除尘器、脱硝器、换热器、电除尘器、主抽风机。在烧结机大烟道上设大烟道中前段分隔阀及大烟道中后段分隔阀;在烧结机台车上方设中段风罩及后段风罩;在中前段分隔阀与中后段分隔阀之间的大烟道上设中段循环风管及调节风门,大烟道通过中段循环风管连接烧结机后段风罩,在中段循环风管上设中间循环风机,在中后段分隔阀后的大烟道上设脱硝烟道,脱硝烟道与电除尘器相连;在脱硝烟道上设脱硝器、换热器。
[0005]本发明的一种烧结烟气节能型脱硝系统优选方案为在环冷机低温段上设环冷机低温段烟罩,在环冷机低温段烟罩上设环冷机热风管;所述环冷机热风管与烧结机中段风罩、后段风罩相连。
[0006]本发明的优选方案为在烧结机台车上方前段设前段风罩,在前段风罩设前补风门、前加氨装置。
[0007]本发明的优选方案为在烧结机中段风罩上设中补风门及中加氨装置,在烧结机后段风罩上设后加氨装置。
[0008]本发明的优选方案为脱硝器采用SCR脱硝装置。
[0009]本发明的优选方案为换热器采用余热锅炉。
[0010] 本发明的优选方案为在脱硝烟道上设中高温除尘器及调节风门;中高温除尘器设为多管式陶瓷除尘器。
[0011]本发明的优选方案为在大烟道中后段分隔阀与电除尘器之间的大烟道采用搪瓷钢管。
[0012]本发明的优选方案为在换热器与电除尘器之间的脱硝烟道采用搪瓷钢管。
[0013]本发明的优选方案为在中前段分隔阀与主抽风机之间的大烟道设首段分隔阀,在中前段分隔阀与首段分隔阀之间大烟道上设前段循环风管,在前段循环风管上设前段循环风机及调节风门,大烟道通过前段循环风管与中段风罩相连。
[0014]本发明的工艺流程:通过循环风机将烧结机中前段风箱的烟气抽出送入烧结机机尾的风罩,并与环冷机低温段的热废气混合,提高烧结机机尾料面的风温,并将中前段风箱的烟气氮化物附集到机尾风箱大烟道,机尾大烟道中的烟气不仅含氮氧化物,而且温度也达到了 SCR工艺的要求,然后这种高温、高氮化物的烟气被送入脱硝烟道,接着进入中高温除尘器进行除尘,除尘后的烟气,送入脱硝器进行脱硝,脱硝后的高温烟气送入换热器换热,经过换热后的烟气送入电除尘器进行进一步除尘,然后送去脱硫。
[0015]在烧结机前段风罩、中段风罩及后段风罩上增加加氨装置,并进行加氨,在烧结机上实现了SNCR和SCR联合脱硝工艺,达到了深度脱硝目的。
[0016]本发明有益效果是:
[0017] I)利用烧结工艺的余热进行脱硝,节约大量煤气。
[0018] 2)提高烧结工艺余热回收水平。
[0019] 3)在烧结生产过程,实现SNCR和SCR联合脱硝工艺,达到深度脱硝目的。
附图说明
[0020]图1是本发明一种烧结烟气节能型脱硝系统示意图;
[0021] 1、中段循环风管2、大烟道3、中间循环风机4、中前段分隔阀5、前段风罩6、前补风门7、前加氨装置8、中段风罩9、中补风门10、后段风罩11、环冷机热风管12、环冷机低温段烟罩13、脱硝烟道14、中后段分隔阀15、中高温除尘器16、脱硝器加氨装置17、脱硝器18、换热器19、首段分隔阀、20、前段循环风机21、电除尘器22、主抽风机
具体实施方式
[0022]下面结合附图对本发明作更进一步的说明。
[0023]如图1所示,本发明的一种烧结烟气节能型脱硝系统,主要包括烧结机、环冷机、大烟道(2)、中间循环风机(3)、大烟道中前段分隔阀(4)、烧结机中段风罩(8)、烧结机后段风罩(10)、脱硝烟道(13)、大烟道中后段分隔阀(14)、中高温除尘器(15)、脱硝器(17)、换热器
(18)、电除尘器(21)、主抽风机(20),在烧结机大烟道(2)上安装大烟道中前段分隔阀(4)及大烟道中后段分隔阀(14),将大烟道分成三段;中前段分隔阀安装在烧结机前1/3风箱处,中后段分隔阀安装在烧结机后段1/3风箱处;在烧结机台车前1/3段安装前段风罩(5),前段风罩上安装补风门(6)及加氨装置(7);在烧结机中间1/3段安装中段风罩(8),在中段风罩
(8)上安装补风门(9);在烧结机后部1/3段安装后段风罩(10);在中前段分隔阀(4)与中后段分隔阀(14)之间的大烟道上安装中段循环风管(I),通过中段循环风管(I)将大烟道(2)与烧结机后段风罩(10)相连,在中段循环风管(I)上安装中间循环风机(3),在中间循环风机的进出口安装进出风门,用于调节循环风机的风量;在中前段分隔阀(4)与主抽风机之间的大烟道上安装首段分隔阀(19),在首段分隔阀(19)与中前分隔阀(4)之间大烟道(2)上安装前段循环风管,在前段循环风管上安装前段循环风机(20),前段循环风管将大烟道与烧结机中段风罩(8)相连,前段循环风机安装进出调节门。
[0024]在中后段分隔阀(14)后的大烟道上安装脱硝烟道(13),脱硝烟道(13)与电除尘器
(21)相连;在脱硝烟道上安装中高温除尘器(15)、脱硝器(17)、换热器(18)。在环冷机低温段上安装环冷机低温段烟罩(12),在环冷机低温段烟罩(12)上安装环冷机热风管(I I)环冷机热风管(11)与烧结机中段风罩(8)、后段风罩(10)相连。脱硝器(17)采用SCR脱硝装置,脱硝器中安装有板式催化器装置。换热器(18)采用余热锅炉。除尘器(15)采用多管式陶瓷除尘器。在大烟道中后段分隔阀(14)与电除尘器(21)之间的大烟道采用搪瓷钢管。在换热器
(18)与电除尘器(21)之间的脱硝烟道(13)采用搪瓷钢管。
[0025]在烧结机后段风罩上安装后加氨装置。
[0026]本发明系统运行流程:前段循环风机(20)将烧结机前段风箱的烟气通过前段循环风管送入烧结机中间风罩(8),与环冷机低温段热废气混合,提高用于烧结的热风的温度及含氧量,用于烧结机中段烧结,并使中间风箱烟气中的氮氧化物进行了附集;中间循环风机
(3)将烧结机中间风箱的烟气,通过中段循环风管(I)送入烧结机后段风罩,与环冷机低温段的热废气混合,提高用于烧结的热风的温度及含氧量,用于烧结机后段烧结,烧结机后段进入大烟道的烟气不仅温度高,而且由于中段的烟气中的氮氧化物附集,烟气中的氮氧化物含量也较高,这部份烟气首先被送入多管式陶瓷除尘器除尘后,接着送入脱硝器中,烟气中的氮氧化物在催化剂作用下,与氨气反生化学反应生成氮气,实现烟气脱硝,脱硝后的烟气送入余热锅炉进行换热生产蒸汽,换热后烟气与烧结机前段的大烟道烟气混合后送入电除尘器除尘,最后送入脱硫系统进行脱硫。烧结机前段、中段,通过直接在前段风罩(5)和中段风罩(8)的加氨装置进行加氨,采用SNCR方法对烧结机前段和中段进行脱硝。
[0027]本实施方案为SNCR与SCR联合脱硝,可以实现烧结烟气深度脱硝,脱硝效率可以达到60%以上,并且不需要对烧结烟气进行加热。
[0028]以上所述仅是本发明的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范。
Claims (10)
1.一种烧结烟气节能型脱硝系统,包括烧结机、环冷机、大烟道(2)、中间循环风机(3)、大烟道中前段分隔阀(4)、烧结机中段风罩(8)、烧结机后段风罩(10)、脱硝烟道(13)、大烟道中后段分隔阀(14)、中高温除尘器(15)、脱硝器(17)、换热器(18)、电除尘器(21)、主抽风机(22),其特征在于:在烧结机大烟道(2)上设大烟道中前段分隔阀(4)及大烟道中后段分隔阀(14);在烧结机台车上方设中段风罩(8)及后段风罩(10);在中前段分隔阀(4)与中后段分隔阀(14)之间的大烟道上设中段循环风管(I)及调节风门,大烟道(2)通过中段循环风管(I)连接烧结机后段风罩(10),在中段循环风管(I)上设中间循环风机(3);在中后段分隔阀(14)后的大烟道上设脱硝烟道(13),大烟道(2)通过脱硝烟道(13)与电除尘器(21)相连;在脱硝烟道(13)上设脱硝器(17)、换热器(18)。
2.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的环冷机低温段上设环冷机低温段烟罩(12),在环冷机低温段烟罩(12)上设环冷机热风管(11);所述环冷机热风管(11)与烧结机中段风罩(8)、后段风罩(10)相连。
3.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的烧结机台车上方前段设前段风罩(5),在前段风罩(5)设前补风门(6)、前加氨装置(7)。
4.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的烧结机中段风罩上设中补风门(9)及中加氨装置;所述的烧结机后段风罩(10)上设后加氨装置。
5.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的脱硝器(17)为SCR脱硝装置。
6.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的换热器(18)为余热锅炉。
7.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的脱硝烟道(13)上设调节风门及中高温除尘器(15);所述的中高温除尘器(15)为多管式陶瓷除尘器。
8.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的大烟道中后段分隔阀(14)与电除尘器(21)之间的大烟道采用搪瓷钢管。
9.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的换热器(18)与电除尘器(21)之间的脱硝烟道(13)采用搪瓷钢管。
10.根据权利要求1所述的一种烧结烟气节能型脱硝系统,其特征在于:所述的中前段分隔阀(4)与主抽风机之间的大烟道设首段分隔阀(19),在中前段分隔阀(4)与首段分隔阀(19)之间大烟道上设前段循环风管,在前段循环风管上设前段循环风机(20)及调节风门,大烟道(2)通过前段循环风管与中段风罩(8)相连。
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