CN204301104U - 锅炉深度降烟温及烟气余热利用系统 - Google Patents
锅炉深度降烟温及烟气余热利用系统 Download PDFInfo
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- CN204301104U CN204301104U CN201420772259.3U CN201420772259U CN204301104U CN 204301104 U CN204301104 U CN 204301104U CN 201420772259 U CN201420772259 U CN 201420772259U CN 204301104 U CN204301104 U CN 204301104U
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- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 19
- 239000000779 smoke Substances 0.000 title claims abstract description 18
- 239000002918 waste heat Substances 0.000 title claims abstract description 16
- 230000003009 desulfurizing Effects 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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- 239000002253 acid Substances 0.000 claims description 5
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- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
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- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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Classifications
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
本实用新型公开了一种锅炉深度降烟温及烟气余热利用系统，包括锅炉和依次连接的空气预热器、电除尘器、引风机、脱硫塔和烟囱，在空气预热器和电除尘器之间布置能级提升装置高能级段，在引风机和脱硫塔之间布置能级提升装置低能级段，能级提升装置高能级段由高能级段换热器与汽轮机凝结水管路通过高能级段入口管道和出口管道连接组成，能级提升装置低能级段由低能级段换热器与低能级段入口管道、出口管道、循环泵和冷风加热器连接，组成闭式循环系统。本实用新型不仅实现了排烟温度深度降低，而且实现烟气余热变能级利用，提高年节煤量，降低脱硫耗水量，提高了电厂整体运行效益。
Description
技术领域
[0001] 本实用新型涉及锅炉排烟余热利用领域，特别涉及一种锅炉深度降烟温及烟气余热利用系统。
背景技术
[0002] 锅炉燃烧各项热损失中，排烟热损失是最大一项，一般排烟温度每升高15〜20°C，就会使排烟热损失增加1%。目前锅炉的烟气温度一般在110〜170°C之间，烟气余热蕴藏着较大的能源，如能够回收利用，其节能效益显著。随着环保要求的日益提高，很多大型锅炉都安装了脱硫设备，而湿法脱硫的最佳反应温度为55°C左右，较高烟温的烟气进入脱硫系统，不仅造成热量的浪费而且会导致脱硫耗水量增大，进而使烟®含湿量增加、烟囱自拔力降低。
发明内容
[0003] 为弥补现有技术的不足，本实用新型提供一种锅炉深度降烟温及烟气余热利用系统，能够有效降低排烟温度并实现烟气余热的有效利用。
[0004] 本实用新型是通过如下技术方案实现的:
[0005] 一种锅炉深度降烟温及烟气余热利用系统，包括锅炉和依次连接的空气预热器、电除尘器、引风机、脱硫塔和烟囱，其特殊之处在于:在空气预热器和电除尘器之间布置能级提升装置高能级段，在引风机和脱硫塔之间布置能级提升装置低能级段；所述能级提升装置高能级段由高能级段换热器与汽轮机凝结水管路通过高能级段入口管道和高能级段出口管道连接组成；所述能级提升装置低能级段由低能级段换热器与低能级段入口管道、低能级段出口管道、循环泵和冷风加热器连接，组成闭式循环系统。
[0006] 本实用新型的锅炉深度降烟温及烟气余热利用系统，所述高能级段入口管道上设有第一关闭阀，其中高能级段换热器位于烟道内，其入口、出口方向与烟道内烟气前进方向相反。
[0007] 本实用新型的锅炉深度降烟温及烟气余热利用系统，所述高能级段换热器和汽轮机凝结水管路之间安装有克服管道流阻的升压泵。
[0008] 本实用新型的锅炉深度降烟温及烟气余热利用系统，所述低能级段出口管道上设有第二关闭阀，其中低能级段换热器位于烟道内，其入口、出口方向与烟道内烟气前进方向相反。
[0009] 本实用新型的锅炉深度降烟温及烟气余热利用系统，所述低能级段换热器表面涂有耐酸防腐涂料。
[0010] 本实用新型的有益效果是:通过深度降低排烟温度到75°c，基本实现排烟热损失为零，有效利用烟气余热，并大大降低脱硫耗水量，提升电厂整体运行效益。此外电除尘入口烟温降低，有效降粉尘比电阻，提高电除尘器的除尘效率。在尾部烟道内依次布置能级提升装置，在送风管道设置冷风加热器，将所回收的排烟余热用于两部分，一部分高能级热能用于加热汽轮机凝结水实现节煤，另一部分低能级热能用于加热入炉冷风，提高空气预热器冷段综合金属壁温，保护空气预热器，冬季可替代常规蒸汽暖风器，节省耗汽。入炉冷风温度提高，空气预热器出口烟温随之提高，提升了烟气余热利用的能级，因此能级提升装置高能级段的节能效果明显高于常规低压省煤器。
附图说明
[0011] 下面结合附图对本实用新型作进一步详细的说明。
[0012] 附图1是本实用新型的结构示意图。
[0013] 图中，I锅炉，2空气预热器，3高能级段出口管道，4高能级段换热器，5高能级段入口管道，6电除尘器，7引风机，8凝结水管道，9循环泵，10低能级段换热器，11低能级段出口管道，12低能级段入口管道，13冷风加热器，14脱硫塔，15烟囱，41第一关闭阀，42第二关闭阀，43调节阀，44第三关闭阀，45升压泵。
具体实施方式
[0014] 附图是本实用新型的一种具体实施方式。该实施例包括锅炉I和依次连接的空气预热器2、电除尘器6、引风机7、脱硫塔14和烟囱15，在空气预热器2和电除尘器6之间烟道内布置能级提升装置高能级段，高能级段换热器4与汽轮机凝结水管路8通过换热器入口管道5和出口管道3连接，高能级段入口管道5上设有第一关闭阀41，其中高能级段换热器4位于烟道内，其入口、出口方向与烟道内烟气前进方向相反，取水来自DJ2低加的进出口，调节入口水温到88 °C左右，根据回水温度的高低回至DJ3或DJ4低加的出口。管道与汽轮机主凝结水并联布置，通过调整调节阀43开度控制水量大小，管道流阻由升压泵45克月艮。通过能级提升装置高能级段降低烟温到95°C左右。
[0015] 在引风机7和脱硫塔14之间烟道内布置能级提升装置低能级段，低能级段换热器10与低能级段入口管道12、出口管道11、循环泵9和冷风加热器13连接，组成闭式循环系统。低能级段出口管道11上设有第二关闭阀42，其中低能级段换热器10位于烟道内，其入口、出口方向与烟道内烟气前进方向相反。流动介质在低能级段换热器10吸收烟气热量，升温后在冷风加热器13加热冷风，替代常规蒸汽暖风器。通过能级提升装置低能级段降低烟温到75°C，然后进入脱硫塔，减少脱硫塔耗水量。低能级段换热器10运行环境低于烟气酸露点，烟气具有较高的酸腐蚀性，通过在换热器表面喷涂耐酸防腐涂料，可实现换热器的长效运行。
[0016] 使用时，开启第一关闭阀41、第二关闭阀42和第三关闭阀44，调整调节阀43的开度，控制高能级段入口水温至设计值，凝结水在高能级段换热器4内与烟气换热后温度升高，流经高能级出口管道3后回到汽轮机主凝结水管路8，从而节省汽轮机抽汽量，实现节能效益；在低能级段闭式管路中注入循环水，通过循环泵9工作，循环水在低能级段换热器10内与烟气换热后温度升高，流经低能级段出口管道11进入冷风加热器13加热锅炉送风，进而提高锅炉烟气温度，增加高能级段节能效益。能级提升装置高能级段与低能级段为独立运行模式，二者可单独启停，当同时运行时，可实现烟气余热变能级利用。
Claims (5)
1.一种锅炉深度降烟温及烟气余热利用系统，包括锅炉(I)和依次连接的空气预热器(2 )、电除尘器(6 )、引风机(7 )、脱硫塔(14 )和烟囱(15 )，其特征在于:在空气预热器(2 )和电除尘器(6)之间布置能级提升装置高能级段，在引风机和脱硫塔之间布置能级提升装置低能级段；所述能级提升装置高能级段由高能级段换热器(4)与汽轮机凝结水管路(8)通过高能级段入口管道(5)和高能级段出口管道(3)连接组成；所述能级提升装置低能级段由低能级段换热器(10)与低能级段入口管道(12)、低能级段出口管道(11)、循环泵(9)和冷风加热器(13 )连接，组成闭式循环系统。
2.根据权利要求1所述的锅炉深度降烟温及烟气余热利用系统，其特征在于:所述高能级段入口管道(5)上设有第一关闭阀(41)，其中高能级段换热器(4)位于烟道内，其入口、出口方向与烟道内烟气前进方向相反。
3.根据权利要求1或2所述的锅炉深度降烟温及烟气余热利用系统，其特征在于:所述高能级段换热器(4)和汽轮机凝结水管路(8)之间安装有克服管道流阻的升压泵(45)。
4.根据权利要求1或2所述的锅炉深度降烟温及烟气余热利用系统，其特征在于:所述低能级段出口管道(11)上设有第二关闭阀(42)，其中低能级段换热器(10)位于烟道内，其入口、出口方向与烟道内烟气前进方向相反。
5.根据权利要求1或2所述的锅炉深度降烟温及烟气余热利用系统，其特征在于:所述低能级段换热器(10)表面涂有耐酸防腐涂料。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104930496A (zh) * | 2015-06-06 | 2015-09-23 | 山东泓奥电力科技有限公司 | 燃煤机组低低温省煤器联合送风加热深度余热回收系统 |
| CN105937773A (zh) * | 2016-06-02 | 2016-09-14 | 山东泓奥电力科技有限公司 | 一种电站锅炉冷凝式烟气除湿净化与节能系统 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104930496A (zh) * | 2015-06-06 | 2015-09-23 | 山东泓奥电力科技有限公司 | 燃煤机组低低温省煤器联合送风加热深度余热回收系统 |
| CN105937773A (zh) * | 2016-06-02 | 2016-09-14 | 山东泓奥电力科技有限公司 | 一种电站锅炉冷凝式烟气除湿净化与节能系统 |
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