CN104941373A - 一种用于烧结机机头烟气终端处理的净化系统 - Google Patents
一种用于烧结机机头烟气终端处理的净化系统 Download PDFInfo
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- CN104941373A CN104941373A CN201510358545.4A CN201510358545A CN104941373A CN 104941373 A CN104941373 A CN 104941373A CN 201510358545 A CN201510358545 A CN 201510358545A CN 104941373 A CN104941373 A CN 104941373A
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- Prior art keywords
- flue gas
- dust collector
- collector pole
- water
- layer
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- 238000005245 sintering Methods 0.000 title claims abstract description 27
- 239000000779 smoke Substances 0.000 title claims abstract description 14
- 238000000746 purification Methods 0.000 title claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 79
- 239000011901 water Substances 0.000 claims abstract description 66
- 239000010410 layers Substances 0.000 claims abstract description 39
- 238000005507 spraying Methods 0.000 claims abstract description 30
- 239000003344 environmental pollutants Substances 0.000 claims abstract description 23
- 231100000719 pollutant Toxicity 0.000 claims abstract description 23
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 239000002253 acids Substances 0.000 claims abstract description 9
- 229910052751 metals Inorganic materials 0.000 claims abstract description 7
- 239000002184 metals Substances 0.000 claims abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 104
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 2
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound 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Abstract
一种用于烧结机机头烟气终端处理的净化系统，包括湿式电除尘器及配套的碱液制备装置和水收集、循环及处理装置；所述湿式电除尘器包含安置在烟气进口处的烟气均布装置、喷雾冲洗层(4)、喷淋冲洗层(5)和包括在烟气面积均布布置的放电极(6)、收尘极(7)的电除尘器，所述放电极为空心近圆形金属放电杆，放电极即金属放电杆的直径5～35mm，放电杆两侧各有一道M型加固槽，放电极的放电尖端呈三角形，放电尖端位于加固槽内；在烟气中含高金属粉尘、灰分及腐蚀性成分条件下，高效、低物耗、协同除去烟气中的SO2、PM2.5等微细颗粒物、重金属、气溶胶以及湿法脱硫所产生的SO3酸雾等多种污染物。
Description
技术领域
[0001] 本发明属于大气污染控制技术领域，特别涉及一种用于烧结机机头烟气终端处理的净化系统。
背景技术
[0002] 随着国家对环境保护越来越重视，微细烟尘、SO3酸雾、汞等以气溶胶形式存在的污染物的减排已被提到了议事日程。传统的干式电除尘器对于微细烟尘、SO3酸雾、汞等以气溶胶形式存在的污染物基本没有去除能力。国家新的《环境空气质量标准》对原有排放标准要求大幅提高，同时将汞、PM2.5纳入环境空气质量标准。同时，最新的《钢铁烧结、球团工业大气污染物排放标准》(GB28662)进一步提高了钢铁、烧结等领域对粉尘排放的要求。新标准提出后，目前国内绝大部分烧结机配套的环保设备技术参数无法达到新标准的要求，这就必然要对现有设备进行改造。
[0003] 烧结烟气脱硫与火电行业燃煤烟气脱硫类似，但由于钢铁行业的特殊性，其烧结机机头脱硫后烟气具有金属粉尘、灰分含量较高，烟气腐蚀性较大的特点。虽然目前国内部分烧结机机头烟气采用湿法脱硫工艺，但是对于上述问题治理效果并不明显。湿式电除尘器对于微细烟尘、SO3酸雾、汞等以气溶胶形式存在的污染物拥有良好的去除能力，但目前湿式电除尘器很少应用于烧结机脱硫后烟气处理，且已运行的在使用过程中也出现除尘效率低、可靠性较差、腐蚀严重等问题。
发明内容
:
[0004] 本发明的目的是，克服现有技术的缺点，提供一种用于烧结机机头烟气终端处理的净化系统及处理方法。在烟气中含高金属粉尘、灰分及腐蚀性成分条件下，仍能高效、协同除去烟气中的so2、PM2.5等微细颗粒物、重金属(如汞)、气溶胶以及湿法脱硫所产生的SO3酸雾等多种污染物，达到环保要求。
[0005] 为了达到上述目的，釆用的技术方案是:一种用于烧结机机头烟气终端处理的净化系统，包括:湿式电除尘器(2)及配套的碱液和水供给、收集、循环及处理装置，所述湿式电除尘器(2)包含安置在烟气进口处的烟气均布装置(3)，包括喷雾冲洗层(4)、喷淋冲洗层(5)和包括在烟气面积均布布置的放电极¢)、收尘极(7)的电除尘器，所述放电极(6)为空心近圆形金属放电杆，放电极即金属放电杆的直径5〜35mm，放电杆两侧各有一道M型加固槽，放电极的放电尖端呈三角形，放电尖端位于加固槽内；所述放电杆两侧加固槽内的放电尖端可呈平行或交错布置，即同齿或错齿布置；所述收尘极(7)底端设置有导流槽
(8)，导流槽(8)与收尘极(7)间留有空隙；所述净化系统在脱硫吸收塔(I)塔内布置或塔外布置，或置于专门塔形容器内；喷雾冲洗层(4)和喷淋冲洗层(5)设有配套的碱液和水供给收集、循环及处理装置。
[0006] 所述收尘极(7)为多个正方形中空柱状结构并开有缺口的单元构成，空柱单元底端相对两侧各有一角度为60〜160°的角形缺口 ；所述收尘极(7)底端设置有导流槽(8)，导流槽⑶与收尘极(7)间留有空隙；导流槽形状与收尘极相匹配，所述导流槽⑶由数条横向平行直槽及竖向三角形槽组成的平面网格状结构，其形状与收尘极(7)相匹配，导流槽(8)的三角形槽呈倒三角形，角度为60〜160°。电除尘器的收尘极是由多个图4所示单元构成。所述收尘极为正方形中空柱状结构并开有缺口 ；所述喷雾冲洗层喷雾介质为碱性物质水溶液，pH为7.5〜10。
[0007] 所述喷雾冲洗层(4)由喷雾喷嘴及管道组成，其喷嘴布置位置位于格板构成的烟气均布装置⑶的格板间节点位置，喷雾冲洗层⑷喷雾介质为碱性物质水溶液，PH为7.5〜10。隔板结构可简单理解为类似于格栅板的结构，即由多条钢板条焊接成的网格状结构。
[0008] 一种用于烧结机机头烟气终端处理的净化方法，依次包括如下步骤:
[0009] I)烟气均布降速:烟气经脱硫处理后，烟气经过烟气均布装置均布降速；
[0010] 2)烟气调质:烟气经过喷雾冲洗层时，带有碱性液滴的水雾与烟气混合将烟气中的含酸物质进行中和，且雾化水增加了烟气的湿度，促使烟气中细微颗粒碰撞、凝并，使细微颗粒的粒径增大；
[0011] 3)污染物脱除:经步骤2)处理后的烟气经过湿式电除尘器中放电极和收尘极形成的均匀电场，烟气中的污染物在电场力作用下吸附于收尘极上，达到对烟气中的多种污染物进行脱除处理的作用；
[0012] 4)烟气排放；经步骤3)后，烟气经由烟气出口排出，完成烟气的净化。
[0013] 在步骤3)中，通过湿式电除尘器对烟气进行污染物脱除处理的方法为:通过电控装置控制放电极放电，使烟气中的污染物在电场的作用下吸附在收尘极上，喷淋冲洗层上的喷嘴向收尘极喷洒冲洗水，将吸附在收尘极上的污染物及冲洗水通过导流槽经过滤器将混合液中的固体物质过滤后，清洁滤液进入冲洗水收集罐；冲洗水收集罐中的水一部分进入喷雾水调质罐对喷雾水进行调质，一部分无法再利用的水经废水罐收集后进行无害化处理。
[0014] 所述湿式电除尘装置可依据实际情况布置于脱硫吸收塔顶或脱硫吸收塔外。布置于脱硫吸收塔顶时需对脱硫吸收塔增加支撑及补强结构。
[0015] 本发明的有益效果是:本发明提供的一种用于烧结机机头烟气终端处理的净化系统，针对钢铁行业其烧结机机头脱硫后烟气具有金属粉尘、灰分含量较高，烟气腐蚀性较大的特殊性对现有湿式电除尘设备及工艺进行改进，降低了烟气中金属粉尘、灰分及腐蚀性成分对湿式电除尘器收尘效率的影响，对烟气中多种污染物如so2、PM2.5等颗粒物、重金属(比如汞)以及SO3酸雾、气溶胶、逸氨等均能有效除去，提高了对烟气的净化效率，减少了占地面积。采用冲洗水收集及循环使用方式可大幅度减少冲洗水的使用量，提高整个净化系统的运行稳定性。
附图说明
:
[0016] 图1为放电极横截面结构示意图；
[0017] 图2为放电极错齿立面结构示意图；
[0018] 图3为放电极同齿立面结构示意图；
[0019] 图4为单个收尘极单元结构示意图；
[0020] 图5为图4中A方向所示导流槽结构示意图；
[0021] 图6为图5中B方向所示导流槽结构示意图；
[0022] 图7为喷雾冲洗层喷嘴与烟气均布装置的相对位置布置示意图；
[0023] 图8为放电极与收尘极的相对位置布置横向截面示意图；
[0024] 图9为典型湿式电除尘器塔外布置烟气下进上出布置示意图；
[0025] 图10为典型湿式电除尘器塔外布置烟气上进下出布置示意图；
[0026] 图中:
具体实施方式
:
[0027] 为了使本领域的普通技术人员更好的理解本发明，将结合示意图及实施例对本发明进行进一步的说明。
[0028] 图9、10中，脱硫吸收塔1、湿式电除尘器2、烟气均布装置3、喷雾冲洗层4、喷淋冲洗层5、放电极6、收尘极7、导流槽8、过滤器9、工艺水罐10、碱溶解罐11、喷雾水调质罐12、冲洗水收集罐13、废水罐14、工艺水15、易溶碱性物质16、原烟气17、净烟气18。
[0029] 所述收尘极为正方形中空柱状结构，即图4、8所示；其中相对两侧极板底端各有一角度为60〜160°的倒三角形缺口，即图4所示。
[0030] 所述收尘极底端设置有导流槽，导流槽与收尘极间留有空隙；所述导流槽是由数条横向平行直槽及竖向三角形槽组成的平面网格状结构，其形状与收尘极相匹配，导流槽(三角形槽)底端呈倒三角形，角度为60〜160°，即图5、6所示。导流槽承接由喷淋系统和收尘极上自冲洗现象形成的冲洗液的。图5为纵向切面图，图6为横向切面图。
[0031] 所述喷雾冲洗层由喷雾喷嘴及管道组成，其喷嘴布置位置位于烟气均布装置的板间节点位置，喷雾冲洗层喷雾介质为碱性水，pH为7.5〜10，即图7所示。
[0032]图1为放电极横截面结构示意图中；M型加固槽在上下位置，放电极错齿在槽内；
[0033] 图2为放电极错齿立面结构示意图；也是图1的垂直中心竖线的示意图；图3与图2类似，为放电极同齿立面结构示意图。
[0034] 图9中湿式电除尘单元是下部烟气进入，经烟气均布装置3、喷雾冲洗层4、湿式电除尘器后再进入喷淋冲洗层5，导流槽8在湿式电除尘器下部。喷淋冲洗层5在湿式电除尘器上部。
[0035] 图10中湿式电除尘单元是上部烟气进入，经烟气均布装置3、喷雾冲洗层4、喷淋冲洗层5后再进入湿式电除尘器，导流槽8在湿式电除尘器下部。喷淋冲洗层5在湿式电除尘器上部。
[0036] 实施例1
[0037] 105m2烧结机机头原烟气(17)经脱硫吸收塔(I)脱硫后，产生的烟气量为45〜55 万 Nm3/h，502含量 150 〜250mg/Nm 3，含有铁粉 10 〜20mg/Nm3，含 HCl、HF 20mg/Nm3,烟气经烟道由下方烟气入口进入湿式电除尘器(2)，进口温度为50°C〜65°C。如图9所示，烟气通过烟气均布器(3)均布后，与喷雾冲洗层(4)形成的碱性水雾混合先将烟气中的酸性物质中和，并对烟气中的粉尘、重金属(如汞等)、微细颗粒物(PM2.5/PM1CI)等进行湿润调质及初步吸收，烟气中水蒸气达到饱和，为后续的放电极(6)对各种污染物颗粒荷电进行了烟气调质。经调质后的烟气继续上升放电极(6)放电，使烟气中的粉尘、金属氧化物(汞等)、细微颗粒物(PM2.5/PM1CI)及水分子带荷电，在电场的作用下，带有荷电的污染物沉附在收尘极(7)上，并由喷淋冲洗层(5)对收尘极(7)进行冲洗将污染物带入导流槽(8)。经过滤器(9)将混合液中的固体物质过滤后，清洁滤液进入冲洗水收集罐(13);冲洗水收集罐(13)中的水一部分进入喷雾水调质罐(12)对喷雾水进行调质，一部分无法再利用的水经废水罐(14)收集后进行无害化处理。
[0038] 喷淋冲洗层(4)所需用水由工艺水(15)注入工艺水罐(10)提供；喷雾冲洗水由工艺水罐(10)注入碱溶解罐(11)并加入易溶碱性物质(16)(氨水或氢氧化钠溶液均可)搅拌溶解，碱溶液通过输送泵注入喷雾水调质罐(12)，与一部分冲洗水收集罐(13)中的水混合调质后，提供给喷雾冲洗层使用。
[0039] 净烟气(18)通过烟气出口排出。出口烟气中，总悬浮颗粒物(TSP) ( 15mg/Nm3，PM2.17 μ g/Nm 3，Hg 彡 3 μ g/Nm3，NH3彡 3 μ g/Nm 3，SO3气溶胶彡 3 μ g/Nm 3，烟气含水量^ 90g/Nm3o
[0040] 实施例2
[0041] 360m2烧结机机头原烟气(17)经脱硫吸收塔(I)脱硫后，产生的烟气量为65〜85 万 Nm3/h，502含量 150 〜250mg/Nm 3，含有铁粉 10 〜20mg/Nm3，含 HCl、HF 20mg/Nm3,烟气经烟道由上方烟气入口进入湿式电除尘器(2)，进口温度为50°C〜65°C。如图10所示，烟气通过烟气均布器(3)均布后，与喷雾冲洗层(4)形成的碱性水雾混合先将烟气中的酸性物质中和，并对烟气中的粉尘、重金属(如汞等)、微细颗粒物(PM2.5/PM1CI)等进行湿润调质及初步吸收，烟气中水蒸气达到饱和，为后续的放电极(6)对各种污染物颗粒荷电进行了烟气调质。经调质后的烟气继续上升放电极(6)放电，使烟气中的粉尘、金属氧化物(汞等)、细微颗粒物(PM2.5/PM1CI)及水分子带荷电，在电场的作用下，带有荷电的污染物沉附在收尘极(7)上，并由喷淋冲洗层(5)对收尘极(7)进行冲洗将污染物带入导流槽(8)。经过滤器(9)将混合液中的固体物质过滤后，清洁滤液进入冲洗水收集罐(13);冲洗水收集罐(13)中的水一部分进入喷雾水调质罐(12)对喷雾水进行调质，一部分无法再利用的水经废水罐(14)收集后进行无害化处理。
[0042] 喷淋冲洗层(4)所需用水由工艺水(15)注入工艺水罐(10)提供；喷雾冲洗水由工艺水罐(10)注入碱溶解罐(11)并加入易溶碱性物质(16)搅拌溶解，碱溶液通过输送泵注入喷雾水调质罐(12)，与一部分冲洗水收集罐(13)中的水混合调质后，提供给喷雾冲洗层使用。
[0043] 净烟气(18)通过烟气出口排出。出口烟气中，总悬浮颗粒物(TSP) ( 10mg/Nm3,PM2.15 μ g/Nm 3，Hg 彡 3 μ g/Nm3, NH3彡 3 μ g/Nm 3，SO3气溶胶彡 3 μ g/Nm 3，烟气含水量^ 90g/Nm3o
[0044] 本发明提供的一种用于烧结机机头烟气终端处理的净化系统，针对钢铁行业其烧结机机头脱硫后烟气的特殊性对现有湿式电除尘设备及工艺进行改进，降低了烟气中金属粉尘、灰分及腐蚀性成分对湿式电除尘器收尘效率的影响，对烟气中多种污染物如so2、PM2.5等颗粒物、重金属(比如汞)以及SO3酸雾、气溶胶、逸氨等均能有效除去，提高了对烟气的净化效率，减少了占地面积。采用冲洗水收集及循环使用方式可大幅度减少冲洗水的使用量，提高整个净化系统的运行稳定性。
[0045] 需要注意的是，以上内容是结合具体的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施方式仅限于此，在本发明的上述指导下，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形落在本发明的保护范围内。
Claims (7)
1.一种用于烧结机机头烟气终端处理的净化系统，其特征是包括:湿式电除尘器(2)及配套的碱液和水供给、收集、循环及处理装置，所述湿式电除尘器(2)包含安置在烟气进口处的烟气均布装置(3)，包括喷雾冲洗层(4)、喷淋冲洗层(5)和包括在烟气面积均布布置的放电极(6)、收尘极(7)的电除尘器，所述放电极(6)为空心近圆形金属放电杆，放电极即金属放电杆的直径5~35mm，放电杆两侧各有一道M型加固槽，放电极的放电尖端呈三角形，放电尖端位于加固槽内；所述放电杆两侧加固槽内的放电尖端可呈平行或交错布置，即同齿或错齿布置；所述收尘极(7)底端设置有导流槽(8)，导流槽(8)与收尘极(7)间留有空隙；所述净化系统在脱硫吸收塔(I)塔内布置或塔外布置，或置于专门塔形容器内；喷雾冲洗层(4)和喷淋冲洗层(5)设有配套的碱液和水供给收集、循环及处理装置。
2.根据权利要求1所述的用于烧结机机头烟气终端处理的净化系统，其特征是所述收尘极(7)为多个正方形中空柱状结构并开有缺口的单元构成，空柱单元底端相对两侧各有一角度为60~160°的角形缺口 ；所述收尘极(7)底端设置有导流槽(8)，导流槽(8)与收尘极(7)间留有空隙；导流槽形状与收尘极相匹配，所述导流槽(8)由数条横向平行直槽及竖向三角形槽组成的平面网格状结构，其形状与收尘极(7)相匹配，导流槽(8)三角形槽呈倒三角形，角度为60~160°。
3.根据权利要求1所述的用于烧结机机头烟气终端处理的净化系统，其特征是所述喷雾冲洗层(4)由喷雾喷嘴及管道组成，其喷嘴布置位置位于格板构成的烟气均布装置(3)的格板间节点位置，喷雾冲洗层(4)喷雾介质为碱性物质水溶液，pH为7.5~10。
4.一种用于烧结机机头烟气终端处理的净化方法，其特征是依次包括如下步骤: 1)烟气均布降速:烟气经脱硫处理后，烟气经过烟气均布装置均布降速； 2)烟气调质:烟气经过喷雾冲洗层时，带有碱性液滴的水雾与烟气混合将烟气中的含酸物质进行中和，且雾化水增加了烟气的湿度，促使烟气中细微颗粒碰撞、凝并，使细微颗粒的粒径增大； 3)污染物脱除:经步骤2)处理后的烟气经过湿式电除尘器中放电极和收尘极形成的均匀电场，烟气中的污染物在电场力作用下吸附于收尘极上，达到对烟气中的多种污染物进行脱除处理的作用； 4)烟气排放；经步骤3)后，烟气经由烟气出口排出，完成烟气的净化。
5.根据权利要求4所述的用于烧结机机头烟气终端处理的净化方法，其特征是在步骤3)中，通过湿式电除尘器对烟气进行污染物脱除处理的方法为:通过电控装置控制放电极放电，使烟气中的污染物在电场的作用下吸附在收尘极上，喷淋冲洗层上的喷嘴向收尘极喷洒冲洗水，将吸附在收尘极上的污染物及冲洗水通过导流槽经过滤器将混合液中的固体物质过滤后，清洁滤液进入冲洗水收集罐；冲洗水收集罐中的水一部分进入喷雾水调质罐对喷雾水进行调质，一部分无法再利用的水经废水罐收集后进行无害化处理。
6.根据权利要求4所述的用于烧结机机头烟气终端处理的净化方法，其特征是所述湿式电除尘装置可依据实际情况布置于脱硫吸收塔顶或脱硫吸收塔外；布置于脱硫吸收塔顶时需对脱硫吸收塔增加支撑及补强结构。
7.根据权利要求4所述的用于烧结机机头烟气终端处理的净化方法，其特征是喷雾冲洗层(4)喷雾介质为碱性物质水溶液，如氨水或氢氧化钠等碱性物质，pH为7.5~10。
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