CN113294228B - 一种挥发性有机废气处理*** - Google Patents

一种挥发性有机废气处理*** Download PDF

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CN113294228B
CN113294228B CN202110532475.5A CN202110532475A CN113294228B CN 113294228 B CN113294228 B CN 113294228B CN 202110532475 A CN202110532475 A CN 202110532475A CN 113294228 B CN113294228 B CN 113294228B
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刘海峰
王灿
张晓腾
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/05Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
    • F01N3/055Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air without contact between air and exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
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    • YGENERAL 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
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    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10Internal combustion engine [ICE] based vehicles
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
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Abstract

本发明公开了一种挥发性有机废气处理***,主要包括安装在密闭箱体内的沸石浓缩转轮、过滤箱、排气风机、脱附风机、储气罐、浓度检测装置、空气流量计、进排气管道、换热器、汽油机、发电机和余热回收***。沸石浓缩转轮将废气浓缩,并利用废气以及换热器实现转轮的再生。用汽油机取代回收式热力焚烧技术中的TNV装置,来燃烧VOC废气。汽油机通过曲轴同轴连接发电机,带动发电机发电,从而补偿电能成本,可节省天然气成本。VOC废气在汽油机中燃烧后的排气温度可达600~800℃,高于TNV装置中的排气温度(350~400℃),可提高换热器中的加热效率,并获得更高的余热回收能量。

Description

一种挥发性有机废气处理***
技术领域
本发明涉及废气处理***,尤其涉及挥发性有机废气处理***。
背景技术
石油化工、印刷、烤漆等工业领域中常会产生大量的挥发性有机物(VOC)废气,如甲苯、二甲苯、乙烯、甲醛等。近年来,VOC重点行业排放政策和标准陆续发布。沸石浓缩转轮结合回收式热力焚烧***是处理大风量、低浓度VOC排放的有效途径。但此***中的回收式热力焚烧炉(TNV)装置运行时需要消耗大量天然气。除天然气外,***运行还需要消耗电能,主要包括排风风机(160kW)、脱附风机(45kW)、TNV风机(55kW)等装置。VOC废气在TNV中燃烧后,仅可通过废气热量的回收利用来补偿成本。沸石转轮结合回收式热力焚烧***的运行能耗成本有待进一步降低。
发明内容
本发明的目的在于克服已有技术的缺点,提供一种用汽油机代替回收式热力焚烧技术中TNV装置,并带动发电机发电补偿电能成本的挥发性有机废气处理***。
本发明的一种挥发性有机废气处理***,包括:
安装在密闭箱体内的沸石浓缩转轮以及安装有过滤材料的过滤箱,在所述的密闭箱体的前壁的上部开有吸附区进气口并且在前壁的下部开有脱附区出气口和冷却区进气口,在所述的密闭箱体的后壁的上部开有吸附区出气口并且在后壁的下部开有脱附区进气口和冷却区出气口;
所述的过滤箱的进口通过进口管线与VOC废气连通,所述的过滤箱的出口通过废气输送管线与吸附区进气口连通,所述的吸附区出气口通过废气排放管线与排气风机的进风口连接,所述的排气风机的排风口与大气连通,位于过滤箱和沸石浓缩转轮之间的废气输送管线通过支管与冷却区进气口连通;
所述的密闭箱体的冷却区出气口通过管道与换热器的壳程流体进口接管连接,所述的换热器的壳程流体出口接管通过管道与所述的密闭箱体的脱附区进气口连接,一根排气管线的进口与密闭箱体的脱附区出气口连通,所述的排气管线的出口依次连接脱附风机、储气罐以及浓度检测装置;
全部四缸四冲程汽油机的进气歧管与一根进气总管连通,所述的四缸四冲程汽油机的台数y根据公式计算得到:
Figure BDA0003068447500000021
其中,A为进入过滤箱中的有机废气风量,m3/h;B为进入过滤箱中的有机废气浓度,mg/m3;n为汽油机转速,r/min,若计算结果不是整数,则四舍五入取整数;
所述的进气总管与一根进气管道的出口端连通,所述的进气管道的进口端与新鲜空气连通并在所述的进气管道的进口端安装有空气流量计,位于浓度检测装置出口侧的所述的排气管线与进气管道连通;每一台四缸四冲程汽油机的曲轴分别与一台发电机的转轴固定相连,全部四缸四冲程汽油机的排气歧管共同通过一根排气总管与排气管道的进口连通,所述的排气管道的出口侧连接所述的换热器的管程流体入口接管,所述的换热器的管程流体出口接管通过管道连接余热回收***,所述的余热回收***与大气连通,各台所述的发电机通过电线连接到排气风机和脱附风机。
与现有技术相比,本发明具有以下有益效果:
将VOC废气通入汽油机燃烧,VOC废气在汽油机中的压缩冲程中温度升高,通过火花塞点火即可燃烧,从而可节省天然气成本,且由于更高的排气温度可获得更高的余热回收能量。
使用TNV装置燃烧处理VOC废气时,需要天然气燃烧加热;而用汽油机燃烧处理VOC废气,VOC废气在汽油机中的压缩冲程中温度升高,通过火花塞点火即可燃烧,从而可节省天然气成本。
用汽油机取代回收式热力焚烧技术中的TNV装置,同时,汽油机通过曲轴同轴连接发电机。汽油机做功可带动发电机发电,从而补偿电能成本。
VOC废气在汽油机中燃烧后的排气温度可达600~800℃,高于TNV装置中的排气温度(350~400℃),一方面更高的排气温度可提高换热器中的加热效率,另一方面,可获得更高的余热回收能量。
附图说明
图1为本发明的一种挥发性有机废气处理***的结构示意图。
具体实施方式
为了使发明所述的案例更易于理解,列举以下具体实施例,但是本发明的权利要求范围不受这些实施例的限制。基于本发明的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
如附图所示的本发明的一种挥发性有机废气处理***,包括:
安装在密闭箱体内的沸石浓缩转轮2以及安装有过滤材料的过滤箱1,在所述的密闭箱体的前壁的上部开有吸附区进气口并且在前壁的下部开有脱附区出气口和冷却区进气口,在所述的密闭箱体的后壁的上部开有吸附区出气口并且在后壁的下部开有脱附区进气口和冷却区出气口。
所述的过滤箱1的进口通过进口管线与VOC废气连通,所述的过滤箱1的出口通过废气输送管线与吸附区进气口连通,所述的吸附区出气口通过废气排放管线与排气风机3的进风口连接,所述的排气风机3的排风口与大气连通。位于过滤箱1和沸石浓缩转轮2之间的废气输送管线通过支管与冷却区进气口连通。
所述的沸石浓缩转轮采用现有结构即可,如论文《汽车涂装车间喷漆室废气治理方案简析》(罗浩.汽车工艺与材料,2021(01):33-37.)中的沸石转轮***。在本实施例中,所述的沸石浓缩转轮2逆时针旋转。VOC废气被吸附在吸附区的沸石上;然后吸附区旋转到脱附区位置,用高温气体将VOC废气从沸石上分离;接着高温脱附区旋转到冷却区位置,通过低温气体的冷却,以提高沸石的吸附效率,实现浓缩转轮的再生;最后冷却区再次旋转到吸附区位置进行吸附。
VOC废气通过所述的过滤箱1后,进入所述的沸石浓缩转轮2。大部分废气进入所述的沸石浓缩转轮2的吸附区,废气中的甲苯、二甲苯等有机成分(VOC废气)被吸附在沸石表面,废气中的干净成分被分离出去,通过排气风机3排入大气。小部分废气通过所述的过滤箱1后,进入所述的沸石浓缩转轮2的冷却区。所述的密闭箱体的冷却区出气口通过管道与换热器4的壳程流体进口接管连接,所述的换热器4的壳程流体出口接管通过管道与所述的密闭箱体的脱附区进气口连接。从所述的沸石浓缩转轮2的冷却区出来的废气进入所述的换热器4的壳程,被加热后,进入所述的沸石浓缩转轮2的脱附区。
一根排气管线的进口与密闭箱体的脱附区出气口连通,所述的排气管线的出口依次连接脱附风机5、储气罐6以及浓度检测装置7。
全部四缸四冲程汽油机的进气歧管与一根进气总管连通,所述的四缸四冲程汽油机的台数y根据公式计算得到:
Figure BDA0003068447500000041
其中,A为进入过滤箱中的有机废气风量,m3/h;B为进入过滤箱中的有机废气浓度,mg/m3;n为四缸四冲程汽油机转速,r/min。若计算结果不是整数,则四舍五入取整数。
下面举例说明计算过程:
本发明引用论文《浓缩焚烧***在汽车涂装车间VOC废气处理中的应用》(徐元博,杨建锁,刘洪涛,韩玥,田红建.现代涂料与涂装,2019,22(04):48-51.)中涂装废气的数据进行示例说明。根据公式:VOC废气流量=(A×B)/3600,计算出VOC废气流量。论文中的涂装废气参数和VOC废气流量计算结果列在表1中。
表1涂装废气参数
Figure BDA0003068447500000042
将4种VOC废气流量相加可得,总流量为19719mg/s。对于一台转速为3000r/min的四冲程汽油机,其每秒为3000/(60*2)=25个循环,每循环燃气量为100mg,则每秒需要的燃气量为25*100=2500mg。则所需的四缸四冲程汽油机台数y=19719/(2500*4)=1.97因此,废气处理***中采用两台四缸汽油机(如图中的10、11)供给合适的空气量,满足汽油机运行条件。
所述的进气总管与一根进气管道9的出口端连通,所述的进气管道9的进口端与新鲜空气连通并在所述的进气管道9的进口端安装有空气流量计8,位于浓度检测装置7出口侧的所述的排气管线与进气管道连通;每一台四缸四冲程汽油机的曲轴分别与一台发电机12(13)的转轴固定相连。全部四缸四冲程汽油机的排气歧管共同通过一根排气总管与排气管道14的进口连通,所述的排气管道14的出口侧连接所述的换热器4的管程流体入口接管,所述的换热器4的管程流体出口接管通过管道连接余热回收***15,所述的余热回收***15与大气连通,所述的余热回收***15采用现有结构即可,如论文《焙烧炉烟气余热高效利用》(李力,杜海平.铸造设备与工艺,2017(03):57-58+70)中的热管余热回收器。从所述的排气管道14出来的废气进入所述的换热器4的管程,起加热壳程流体的作用,然后进入所述的余热回收***15。各台所述的发电机(如图中的12、13)通过电线连接到排气风机3和脱附风机5,产生电能后,电能驱动排气风机3和脱附风机5运转。
从所述的沸石浓缩转轮2的脱附区沸石上分离出的VOC废气,以及用于脱附区分离作用的高温VOC废气,一起从脱附区出气口通过脱附风机5从所述的脱附区中进入储气罐6;在进入进气管道9之前,在浓度检测装置7中进行检测,根据VOC废气浓度计算得到应匹配的新鲜空气量。
新鲜空气经过空气流量计8后,和VOC废气在所述的进气管道9中混合,然后进入汽油机10、11,在所述的汽油机10、11中燃烧放热,输出功分别用于带动发电机12和13发电,产生的电能可用于排气风机3和脱附风机5。所述的汽油机10、11中的VOC废气燃烧后,生成二氧化碳和水等高温无机废气,温度可达到600~800℃。高温无机废气通过排气管道14后进入所述的换热器4,对通过冷却区的有机废气进行加热。高温无机废气在换热过后,温度仍然较高,最后进入所述的余热回收***15,进行余热回收利用后,温度降低,排入大气。

Claims (1)

1.一种挥发性有机废气处理***,其特征在于包括:
安装在密闭箱体内的沸石浓缩转轮以及安装有过滤材料的过滤箱,在所述的密闭箱体的前壁的上部开有吸附区进气口并且在前壁的下部开有脱附区出气口和冷却区进气口,在所述的密闭箱体的后壁的上部开有吸附区出气口并且在后壁的下部开有脱附区进气口和冷却区出气口;
所述的过滤箱的进口通过进口管线与VOC废气连通,所述的过滤箱的出口通过废气输送管线与吸附区进气口连通,所述的吸附区出气口通过废气排放管线与排气风机的进风口连接,所述的排气风机的排风口与大气连通,位于过滤箱和沸石浓缩转轮之间的废气输送管线通过支管与冷却区进气口连通;
所述的密闭箱体的冷却区出气口通过管道与换热器的壳程流体进口接管连接,所述的换热器的壳程流体出口接管通过管道与所述的密闭箱体的脱附区进气口连接,一根排气管线的进口与密闭箱体的脱附区出气口连通,所述的排气管线的出口依次连接脱附风机、储气罐以及浓度检测装置;
全部四缸四冲程汽油机的进气歧管与一根进气总管连通,所述的四缸四冲程汽油机的台数y根据公式计算得到:
Figure FDA0003068447490000011
其中,A为进入过滤箱中的有机废气风量,m3/h;B为进入过滤箱中的有机废气浓度,mg/m3;n为汽油机转速,r/min,若计算结果不是整数,则四舍五入取整数;
所述的进气总管与一根进气管道的出口端连通,所述的进气管道的进口端与新鲜空气连通并在所述的进气管道的进口端安装有空气流量计,位于浓度检测装置出口侧的所述的排气管线与进气管道连通;每一台四缸四冲程汽油机的曲轴分别与一台发电机的转轴固定相连,全部四缸四冲程汽油机的排气歧管共同通过一根排气总管与排气管道的进口连通,所述的排气管道的出口侧连接所述的换热器的管程流体入口接管,所述的换热器的管程流体出口接管通过管道连接余热回收***,所述的余热回收***与大气连通,各台所述的发电机通过电线连接到排气风机和脱附风机。
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