CN204563937U - 一种低温烟气scr脱硝系统 - Google Patents
一种低温烟气scr脱硝系统 Download PDFInfo
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- CN204563937U CN204563937U CN201420742325.2U CN201420742325U CN204563937U CN 204563937 U CN204563937 U CN 204563937U CN 201420742325 U CN201420742325 U CN 201420742325U CN 204563937 U CN204563937 U CN 204563937U
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- scr reactor
- catalyst
- flue gas
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- 239000000779 smoke Substances 0.000 title claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims abstract description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nODVweCcgaGVpZ2h0PSc4NXB4JyB2aWV3Qm94PScwIDAgODUgODUnPgo8IS0tIEVORCBPRiBIRUFERVIgLS0+CjxyZWN0IHN0eWxlPSdvcGFjaXR5OjEuMDtmaWxsOiNGRkZGRkY7c3Ryb2tlOm5vbmUnIHdpZHRoPSc4NS4wJyBoZWlnaHQ9Jzg1LjAnIHg9JzAuMCcgeT0nMC4wJz4gPC9yZWN0Pgo8dGV4dCB4PSczNS4wJyB5PSc1My42JyBjbGFzcz0nYXRvbS0wJyBzdHlsZT0nZm9udC1zaXplOjIzcHg7Zm9udC1zdHlsZTpub3JtYWw7Zm9udC13ZWlnaHQ6bm9ybWFsO2ZpbGwtb3BhY2l0eToxO3N0cm9rZTpub25lO2ZvbnQtZmFtaWx5OnNhbnMtc2VyaWY7dGV4dC1hbmNob3I6c3RhcnQ7ZmlsbDojNDI4NEY0JyA+TjwvdGV4dD4KPHRleHQgeD0nNTEuMCcgeT0nNTMuNicgY2xhc3M9J2F0b20tMCcgc3R5bGU9J2ZvbnQtc2l6ZToyM3B4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO3RleHQtYW5jaG9yOnN0YXJ0O2ZpbGw6IzQyODRGNCcgPkg8L3RleHQ+Cjx0ZXh0IHg9JzY3LjAnIHk9JzYyLjknIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6MTVweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiM0Mjg0RjQnID4zPC90ZXh0Pgo8L3N2Zz4K N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 37
- 239000003546 flue gas Substances 0.000 abstract description 37
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000002779 inactivation Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical compound 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- 238000000034 method Methods 0.000 description 6
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- 230000000694 effects Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances 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Abstract
本实用新型提供了一种低温烟气SCR脱硝系统，有效避免了催化剂的失活，减少烟气的加热环节，大大降低了能源消耗和系统运行费用，减少了设备投资规模，同时解决了低温烟气SCR脱硝技术经济性能低下的问题，节省了能源，其包括除尘器，所述除尘器连接SCR反应器，所述除尘器与所述SCR反应器间连接氨气混合器，所述SCR反应器通过排烟风机连接烟囱，其特征在于：所述SCR反应器连接催化剂加热装置。
Description
技术领域
[0001] 本实用新型涉及燃烧烟气环保处理的技术领域，具体为一种低温烟气SCR脱硝系统及其工艺。
背景技术
[0002] 叫的来源主要是化学燃料的燃烧，包括燃煤电厂、工业炉窑、机动车尾气等，对人体危害较大。目前，选择性催化还原SCR烟气脱硝技术对中、高温烟气的脱销比较有效，尤以NH3为还原剂的中、高温烟气SCR脱硝日趋成熟。低温烟气SCR脱硝技术正在国内外研究开发中，技术上还没有成熟，主要问题是SCR催化剂面临着SOjP水蒸气的负面影响，SO2非常容易与NH3反应生成硫酸胺盐沉积于催化剂表面，导致催化剂失活。对于低温烟气NO x的脱除，现在的方法就是加热低温烟气，提高低温烟气温度，适应中、高温烟气SCR脱硝的温度范围，然后选择中、高温烟气SCR脱硝技术脱除烟气中的N0X。由于加热低温烟气需要高温热源，且烟气流量大，能源消耗非常大，系统运行费用相当高，推广应用非常困难，导致低温烟气脱硝的使用率比较低，严重影响NOx的减排。
发明内容
[0003] 针对现有的上述问题，本实用新型提供了一种低温烟气SCR脱硝系统，有效避免了催化剂的失活，减少烟气的加热环节，大大降低了能源消耗和系统运行费用，减少了设备投资规模，同时解决了低温烟气SCR脱硝技术经济性能低下的问题，节省了能源。
[0004] 其技术方案是这样的，一种低温烟气SCR脱硝系统，其包括除尘器，所述除尘器连接SCR反应器，所述除尘器与所述SCR反应器间连接氨气混合器，所述SCR反应器通过排烟风机连接烟囱，其特征在于:所述SCR反应器连接催化剂加热装置。
[0005] 本实用新型的上述结构中，由于SCR反应器连接催化剂加热装置，对催化剂进行加热，有效防止了 302与順3反应生成硫酸胺盐沉积于催化剂表面，避免了催化剂的失活，减少烟气的加热环节，减少了烟气的流量，使催化剂的用量减少，使脱硝系统设备体积减小、
可以使脱硝系统在低温、低能耗下运行，节省了投资及运行成本，提高了经济效益及社会效.、
Mo
附图说明
[0006] 图1为本实用新型低温烟气SCR脱硝系统示意图；
具体实施方式
[0007]见图 1，
[0008] 一种低温烟气SCR脱硝系统，其包括除尘器1，除尘器I连接SCR反应器2，除尘器I与SCR反应器2间连接氨气混合器3，SCR反应器2连接催化剂加热装置4，SCR反应器2通过排烟风机5连接烟囱6，SCR反应器2连接催化剂加热装置4，对SCR反应器中的催化剂进行加热，分解硫酸胺盐，防止硫酸胺盐在催化剂表面沉积，减缓水蒸气吸附，加快水蒸汽脱附，有利于氨气、NOx与催化剂充分接触，在催化剂的作用下，烟气中的NO x与氨气发生还原反应，生成N2、H2O,最终脱除氮氧化物。
[0009] 本实用新型增设的催化剂加热装置，仅对催化剂进行加热，取消低温烟气的加热，减少了烟气的流量，使催化剂的用量减少，使脱硝系统设备体积减小、SCR反应器前后的烟气管道及烟囱直径变小，能够适应大流量SCR低温烟气脱硝。
[0010] 催化剂加热装置远比加热低温烟气的加热装置要小，所需要的加热量少，能源消耗低。加热在洁净状态下运行，不仅可以直接加热，也可以采用间接加热；不仅可以用燃气燃烧进行加热，也可以采用非燃料类的其他热源进行加热。加热装置运行稳定可靠使用寿命长，脱硝系统的安全性得到提高，运行故障率大大降低。
[0011]见图 1，
[0012] 低温烟气SCR脱硝工艺，其特征在于:其包括:
[0013] (I)、烟气通过除尘器I进行过滤除尘；
[0014] (2)、通过催化剂加热装置4对SCR反应器2中的催化剂进行加热；
[0015] (3)、过滤除尘后的烟气和氨气混合器3中的氨气混合并送入SCR反应器2中通过SCR催化剂与氨气发生还原反应，生成N2、H2O进行脱硝处理；
[0016] (4)、经过脱硝处理后产生的净化后的烟气从SCR反应器2中排除，通过排烟风机5送入烟囱6排放。
[0017] 本实用新型解决了在低温情况下，消除了 SO2和水蒸气对SCR催化剂的负面影响，突破了低温烟气SCR脱硝技术的瓶颈，可以使脱硝系统在低温、低能耗下运行，节省了投资及运行成本，提高了经济效益及社会效益，完全可以代替传统的SCR烟气脱硝系统。
[0018] 本实施例中，
[0019] 除尘器I是烟气净化设备，其内部设有除尘装置，对进入的烟气进行除尘。除尘器I布置在氨气混合器3、SCR反应器2之前，其进口通过管道与烟气源相连，出口分别通过管道与氨气混合器3出口、SCR反应器2进口相连。
[0020] 氨气混合器3通入氨气与压缩空气进行混合，然后进入烟气中并与之充分混合。氨气混合器3压缩空气进口、氨气进口分别通过管道与各自气源相连，其出口通过管道与除尘器I出口、SCR反应器2进口相连。
[0021] SCR反应器2内有SCR催化剂，促使N0x与氨气发生还原反应，脱除氮氧化物。SCR反应器2烟气进口通过管道与除尘器I出口、氨气混合器3出口相连，其烟气出口通过管道与排烟风机2进口相连。
[0022] SCR反应器2内置SCR催化剂直接与加热装置4连接。
[0023] 催化剂加热装置4采用燃料或非燃料热源对SCR催化剂进行直接或间接加热。催化剂加热装置4邻近SCR反应器2布置，其直接与SCR反应器2内置SCR催化剂连接。
[0024] 排烟风机5为系统烟气的流动提供动力，排烟风机5布置在SCR反应器2与烟囱6之间，其进口通过管道与SCR反应器2烟气出口相连，其出口通过管道与烟囱6进口相连。
[0025] 烟囱6是筒体结构。烟囱6进口通过管道与排烟风机5出口相连，其顶端排气口连通大气。
[0026] 下面根据附图来描述本实用新型低温烟气SCR脱硝系统及其工艺的工作流程:
[0027] 含NO^fJ温烟气通过管道进入除尘器1进行过滤除尘，除尘后含尘浓度达标的烟气与由氨气混合器3排出的氨气进行混合,混合后通过管道进入SCR反应器2中。在SCR反应器2内，在SCR催化剂的作用下，烟气中的^'与氨气发生还原反应，生成N 2、H20,最终脱除氮氧化物。脱硝后的烟气排出SCR反应器2，然后通过管道进入排烟风机5，最后由排烟风机5将净化后的烟气通过管道送入烟® 6排放。
[0028] 氨气与压缩空气分别通过管道进入氨气混合器3进行混合，混合后通过管道喷入由除尘器1排出含N0X的低温烟气中，并与烟气充分混合，混合后通过管道进入SCR反应器2。
[0029] 在N0X与氨气发生还原反应过程中，根据低温烟气S02和水蒸气的含量，催化剂加热装置4对SCR反应器2内的催化剂进行整体加热或分段加热，促进催化剂的活性，加强N0X与氨气的反应，提高脱销效率。
Claims (1)
1.一种低温烟气SCR脱硝系统，其包括除尘器，所述除尘器连接SCR反应器，所述除尘器与所述SCR反应器间连接氨气混合器，所述SCR反应器通过排烟风机连接烟®，其特征在于:所述SCR反应器连接催化剂加热装置。
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| CN105688662A (zh) * | 2016-02-03 | 2016-06-22 | 华北电力大学 | 一种内置预氧化单元的低温scr脱硝反应器及其方法 |
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| CN105688662A (zh) * | 2016-02-03 | 2016-06-22 | 华北电力大学 | 一种内置预氧化单元的低温scr脱硝反应器及其方法 |
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