CN101439260B - 脱除低温烟气中氮氧化物的系统及其工艺 - Google Patents
脱除低温烟气中氮氧化物的系统及其工艺 Download PDFInfo
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- CN101439260B CN101439260B CN 200810162592 CN200810162592A CN101439260B CN 101439260 B CN101439260 B CN 101439260B CN 200810162592 CN200810162592 CN 200810162592 CN 200810162592 A CN200810162592 A CN 200810162592A CN 101439260 B CN101439260 B CN 101439260B
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- Prior art keywords
- ammonia
- flue gas
- gas
- low
- temperature
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000003546 flue gases Substances 0.000 title claims abstract description 67
- 238000000034 methods Methods 0.000 title claims abstract description 10
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous Oxide Chemical class 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[O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 title claims description 40
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 93
- 229910052813 nitrogen oxides Inorganic materials 0.000 claims abstract description 24
- 239000007789 gases Substances 0.000 claims abstract description 20
- 239000003054 catalysts Substances 0.000 claims abstract description 19
- 239000003638 reducing agents Substances 0.000 claims abstract description 19
- 239000003570 air Substances 0.000 claims abstract description 13
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical class 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O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003344 environmental pollutants Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 239000011901 water Substances 0.000 abstract description 2
- 239000004152 Nitrogen oxides Substances 0.000 abstract 5
- 230000003134 recirculating Effects 0.000 abstract 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injections Substances 0.000 abstract 1
- 238000005516 engineering processes Methods 0.000 description 4
- 238000010521 absorption reactions Methods 0.000 description 2
- 238000006477 desulfuration reactions Methods 0.000 description 2
- 230000003009 desulfurizing Effects 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound 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- 229910000831 Steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010531 catalytic reduction reactions Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reactions Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound 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Abstract
Description
脱除低温烟气中氮氧化物的系统及其工艺
技术领域
[0001] 本发明涉及环保技术,尤其涉及一种脱除低温烟气中氮氧化物的系统及其工艺。背景技术
[0002] 氮氧化物(NOx) —般是指一氧化氮(NO)和二氧化氮(NO2)两种氮氧化物的统称,是一种主要的大气污染物,对人类的健康和环境造成严重的危害。选择性催化还原法是控制氮氧化物(NOx)应用最为广泛的技术之一,目前国内外的应用主要针对高温烟气(280°C〜450°C )中氮氧化物(NOx)脱除,因其核心组成催化剂的活性温度窗口范围一般在200°C〜480°C,当烟气温度较低(50°C〜200°C )时,该脱硝技术存在氮氧化物脱除率不高、催化剂不能满足高浓氮氧化物(NOx)脱除等诸多问题。
[0003] 经过脱硫后燃煤火电厂烟气、钢厂烧结机烟气、硝酸尾气、硝酸溶化贵金属或有色金属的废气等烟气温度一般都比较低(50°C〜200°C ),不能满足氮氧化物的脱除反应,本发明人建立在长期从事烟气脱硫脱硝及SCR脱硝脱硝催化剂研究的基础上,采用一种技术工艺,实现低温烟气中氮氧化物的有效脱除。
发明内容
[0004] 本发明的目的是克服现有技术的不足,提供一种脱除低温烟气中氮氧化物的系统及其工艺。
[0005] 脱除低温烟气中氮氧化物的系统包括低温烟气源、气-气换热器、加热器、还原剂储运制备系统、氨/空气混合器、氨喷射系统、反应器、高温循环风机、引风机、烟®,低温烟气源依次与气-气换热器、加热器、反应器、气-气换热器、引风机、烟®相连接,还原剂储运制备系统依次与氨/空气混合器、氨喷射系统、反应器相连接,反应器与循环高温风机进口相连接,循环高温风机一出口与加热器进口相连接,循环高温风机另一出口与氨/空气混合器进口相连接。
[0006] 所述的还原剂储运制备系统包括液氨卸料压缩机、液氨储罐、液氨蒸发槽、氨气缓冲罐、氨气稀释槽和废水池,液氨卸料压缩机出口依次与液氨储罐、液氨蒸发槽、氨气缓冲罐、氨气稀释槽相连接,液氨卸料压缩机、液氨储罐、液氨蒸发槽分别与氨气稀释槽相连接,氨气稀释槽与废水池相连接。
[0007] 反应器为卧式或立式反应器。反应器内设有以模块的形式安装的催化剂,催化剂为一层或多层。反应器内催化剂模块迎烟气面之前位置装有声波吹灰器或蒸汽吹灰器。气-气热交换器为螺旋板换热器、列管换热器或回转蓄热式换热器。
[0008] 脱除低温烟气中氮氧化物的工艺是:将温度为50°C〜200°C的低温烟气与反应器出口已脱除氮氧化物后的干净烟气通过气气换热器换热,使原低温烟气升温至150°C〜320°C,并与循环高温风机提供的循环热烟气混合,循环高温风机提供的一部分循环干净烟气用来调节反应器进口气量,另一部分循环干净烟气用来稀释氨气,混合气体经加热器加热的气体温度达到催化剂活性温度窗口范围200°C〜380°C,经加热器加热的烟气与由氨喷射系统喷入的还原剂气体混合均匀后进入反应器,在脱硝催化剂的作用下,烟气中的氮氧化物与还原剂氨气反应生成无害的氮气和水,实现脱除低温烟气中氮氧化物的目的。
[0009] 加热器加热方式可采用电加热方式、燃气加热方式、燃油加热方式、燃煤加热方式或其他加热方式。
[0010] 本发明系统热量损失小,能耗低,操作控制简便、可以高效地直接脱除低温烟气中的氮氧化物(NOx),且不产生其他污染物。
附图说明
[0011] 图1是脱除低温烟气中氮氧化物的系统的结构示意图;
[0012] 图2是本发明的还原剂(氨气)储运及制备系统结构示意图;图中:低温烟气源
1、气-气换热器2、加热器3、还原剂储运制备系统4、氨/空气混合器5、氨喷射系统6、反应器7、循环高温风机8、引风机9、烟囱10、液氨卸料压缩机11、液氨储罐12、液氨蒸发槽13、氨气缓冲罐14、氨气稀释槽15、废水池16。
具体实施方式
[0013] 如图1所示,脱除低温烟气中氮氧化物的系统包括低温烟气源1、气-气换热器2、加热器3、还原剂储运制备系统4、氨/空气混合系统5、氨喷射系统6、反应器7、循环高温风机8、引风机9、烟囱10,低温烟气源I依次与气-气换热器2、加热器3、反应器7、气-气换热器2、引风机9、烟囱10相连接,还原剂储运制备系统4依次与氨/空气混合系统5、氨喷射系统6、反应器7相连接,反应器7与循环高温风机8进口相连接,循环高温风机8 —出口与加热器3进口相连接,循环高温风机8另一出口与氨/空气混合器5进口相连接。
[0014] 所述的反应器7为卧式或立式反应器。反应器7内设有以模块的形式安装的催化齐U,催化剂为一层或多层。反应器内催化剂模块迎烟气面之前位置装有声波吹灰器或蒸汽吹灰器。气-气热交换器2为螺旋板换热器、列管换热器或回转蓄热式换热器。
[0015] 如图2所示,还原剂储运制备系统4包括液氨卸料压缩机11、液氨储罐12、液氨蒸发槽13、氨气缓冲罐14、氨气稀释槽15和废水池16,液氨卸料压缩机11出口依次与液氨储罐12、液氨蒸发槽13、氨气缓冲罐14、氨气稀释槽15相连接,液氨卸料压缩机11、液氨储罐
12、液氨蒸发槽13分别与氨气稀释槽15相连接,氨气稀释槽15与废水池16相连接。
[0016] 脱除低温烟气中氮氧化物的工艺是:温度为70°C的低温烟气与反应器7出口已脱除氮氧化物后的较高温度(240°C)的干净烟气通过气气换热器2换热,使原低温烟气升温至210°C,并与循环高温风机提供的用来调节反应器进口气量的循环热烟气混合,混合烟气经燃气加热器3加热,使温度达到催化剂活性温度240°C。
[0017] 利用液氨卸料压缩机11将液氨由液氨槽车输入液氨储罐12内,液氨储罐12中的液氨利用压力自动输送到液氨蒸发槽13内蒸发为氨气,经氨气缓冲罐14来控制一定的压力及其流量,然后与循环高温风机8提供的一部分干净烟气在氨/空气混合器5中混合均匀,混合气体中氨气的体积百分比为4%,混合气体经过氨喷射系统6喷入反应器7入口烟道,与加热后的热烟气(240°C )混合均匀,在脱硝催化剂的作用下,烟气中的氮氧化物与还原剂氨气反应生成无害的氮气和水,实现脱除低温烟气中氮氧化物的目的。
[0018] 还原剂储运制备系统中各设备因故障其他原因紧急排放的氨气则排入氨气吸收 槽中,经水的吸收排入废水池,再经由废水泵送至废水处理厂处理。
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