CN204901731U - 燃煤机组低低温省煤器联合送风加热深度余热回收系统 - Google Patents
燃煤机组低低温省煤器联合送风加热深度余热回收系统 Download PDFInfo
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- CN204901731U CN204901731U CN201520381820.XU CN201520381820U CN204901731U CN 204901731 U CN204901731 U CN 204901731U CN 201520381820 U CN201520381820 U CN 201520381820U CN 204901731 U CN204901731 U CN 204901731U
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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 title abstract description 98
- 239000003245 coal Substances 0.000 title abstract description 8
- 238000010438 heat treatment Methods 0.000 title abstract description 6
- 239000002918 waste heat Substances 0.000 title abstract description 5
- 238000011084 recovery Methods 0.000 title abstract description 4
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Abstract
本实用新型涉及锅炉排烟余热利用领域，特别公开了一种燃煤机组低低温省煤器联合送风加热深度余热回收系统。该余热回收系统，其特征在于：在静电除尘器前烟道内安装低低温省煤器高温段，在引风机出口至脱硫塔入口烟道内安装低低温省煤器低温段，低低温省煤器高温段与凝汽器凝结水管路连接，低低温省煤器低温段通过低低温省煤器低温段出水管道分别与一次风暖风器和二次风暖风器并联连接，一次风暖风器和二次风暖风器的出水管道与低低温省煤器低温段的低低温省煤器低温段回水管道连通。本实用新型可将脱硫塔入口烟温深度降低到50℃左右，在取得节煤效益的同时，降低脱硫塔耗水量，大大提高电厂整体运行效益。
Description
[0001](一)
技术领域
[0002] 本实用新型涉及锅炉排烟余热利用领域，特别涉及一种燃煤机组低低温省煤器联合送风加热深度余热回收系统。
[0003] (二)
背景技术
[0004]目前国内常规低压省煤器降温幅度最低到90°C左右，受热面的低温段往往需要采用合金钢即可满足低温腐蚀等问题。国家新出台的2014-2020年“煤电节能减排升级与改造行动计划”要求现役机组供电煤耗达到国际先进水平，这就需要锅炉排烟余热回收利用技术要在深度降低排烟温度有新的突破。
[0005] 此外湿法脱硫的最佳反应温度为50°C左右，较高烟温的烟气进入脱硫系统，会导致脱硫耗水量增大，进而使烟囱含湿量增加、烟囱自拔力降低。通过将烟气温度深度降低到50°C左右，可以大量回收烟气余热，降低脱硫耗水量，有效提高电厂整体运行效益。
[0006](三)
发明内容
[0007] 本实用新型为了弥补现有技术的不足，提供了一种降低脱硫塔耗水量、提高除尘效率的燃煤机组低低温省煤器联合送风加热深度余热回收系统。
[0008] 本实用新型是通过如下技术方案实现的:
[0009] 一种燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:在静电除尘器前烟道内安装低低温省煤器高温段，在引风机出口至脱硫塔入口烟道内安装低低温省煤器低温段，在一次风道内设置一次风暖风器，在二次风道内设置二次风暖风器，低低温省煤器高温段与凝汽器凝结水管路连接，低低温省煤器低温段通过低低温省煤器低温段出水管道分别与一次风暖风器和二次风暖风器并联连接，一次风暖风器和二次风暖风器的出水管道与低低温省煤器低温段的低低温省煤器低温段回水管道连通。
[0010] 低低温省煤器低温段出口循环水经循环栗流入一次风和二次风暖风器，经蛇形管排流入暖风器出口集箱，经暖风器回水管道汇集后流入低低温省煤器低温段回水管道，形成一闭式循环水路。
[0011] 本实用新型的更优方案为:
[0012] 所述低低温省煤器高温段在低低温省煤器进水管道上安装升压栗和进水止回阀，低低温省煤器进水管道通过低压加热器出口进水阀门和低压加热器入口进水阀门连通两串联的低压加热器，低压加热器连通凝汽器；低低温省煤器高温段的低低温省煤器回水管道通过低低温省煤器回水管道阀门连通除氧器。
[0013] 低低温省煤器的高温段水侧引自低加入口和低加出口管道，采取与低加回热系统并联的方式。由凝结水系统引出的低压加热器主凝结水，经低低温省煤器进水管道升压栗升压，经低低温省煤器高温段入口集箱进入低低温省煤器高温段，经蛇形管排流入低低温省煤器高温段出口集箱，通过低低温省煤器回水管道进入凝结水系统。
[0014] 所述低低温省煤器高温段上设置有低低温省煤器高温段入口集箱和低低温省煤器高温段出口集箱，低低温省煤器低温段上设置有低低温省煤器低温段入口集箱和低低温省煤器低温段出口集箱。
[0015] 所述一次风暖风器上设置有一次风暖风器入口集箱和一次风暖风器出口集箱；二次风暖风器上设置有二次风暖风器入口集箱和二次风暖风器出口集箱。
[0016] 所述一次风暖风器的出水管上设置有一次风暖风器进水调节阀，二次风暖风器的出水管上设置有二次风暖风器进水调节阀。
[0017] 所述低低温省煤器高温段、低低温省煤器低温段、一次风暖风器和二次风暖风器的本体均为蛇形管排，选用“H”型鳍片管。
[0018] 本实用新型所回收的排烟余热用于两部分，一部分用于加热汽轮机凝结水实现节煤，另一部分用于加热一、二次风，提高空气预热器冷段综合金属壁温，减轻冷端堵塞和腐蚀，冬季可替代常规蒸汽暖风器，节省耗汽。入炉冷风温度提高，提高锅炉效率，低低温省煤器入口烟温和做功效率随之提高。
[0019] 本实用新型可将脱硫塔入口烟温深度降低到50°C左右，在取得节煤效益的同时，降低脱硫塔耗水量，大大提高电厂整体运行效益；此外静电除尘器入口烟温降低到90°C，提高电除尘器的除尘效率。
[0020](四)
附图说明
[0021] 下面结合附图对本实用新型作进一步的说明。
[0022] 图1为本实用新型的结构示意图。
[0023] 图中，I低压加热器入口进水阀门，2低压加热器出口进水阀门，3进水止回阀，4升压栗、5低低温省煤器进水管道，6低低温省煤器高温段，6-1低低温省煤器高温段入口集箱，6-2低低温省煤器高温段出口集箱，7低低温省煤器回水管道，8低低温省煤器回水管道阀门，9低低温省煤器低温段，9-1低低温省煤器低温段入口集箱，9-2低低温省煤器低温段出口集箱，10循环栗，11低低温省煤器低温段出水管道，12 二次风暖风器，13 二次风暖风器入口集箱，14 二次风暖风器出口集箱，15 一次风暖风器，16 一次风暖风器入口集箱，17 一次风暖风器出口集箱，18 二次风暖风器进水调节阀，19 一次风暖风器进水调节阀，20低低温省煤器低温段回水管道。
[0024](五)
具体实施方式
[0025] 附图为本实用新型的一种具体实施例。该实施例在静电除尘器前烟道内安装低低温省煤器高温段6，在引风机出口至脱硫塔入口烟道内安装低低温省煤器低温段9，在一次风道内设置一次风暖风器15，在二次风道内设置二次风暖风器12，低低温省煤器高温段6与凝汽器凝结水管路连接，低低温省煤器低温段9通过低低温省煤器低温段出水管道11分别与一次风暖风器15和二次风暖风器12并联连接，一次风暖风器15和二次风暖风器12的出水管道与低低温省煤器低温段9的低低温省煤器低温段回水管道20连通；所述低低温省煤器高温段6在低低温省煤器进水管道5上安装升压栗4和进水止回阀3，低低温省煤器进水管道5通过低压加热器出口进水阀门2和低压加热器入口进水阀门I连通两串联的低压加热器，低压加热器连通凝汽器；低低温省煤器高温段6的低低温省煤器回水管道7通过低低温省煤器回水管道阀门8连通除氧器；所述低低温省煤器高温段6上设置有低低温省煤器高温段入口集箱6-1和低低温省煤器高温段出口集箱6-2，低低温省煤器低温段9上设置有低低温省煤器低温段入口集箱9-1和低低温省煤器低温段出口集箱9-2 ;所述一次风暖风器15上设置有一次风暖风器入口集箱16和一次风暖风器出口集箱17 ;二次风暖风器12上设置有二次风暖风器入口集箱13和二次风暖风器出口集箱14 ;所述一次风暖风器15的出水管上设置有一次风暖风器进水调节阀19，二次风暖风器12的出水管上设置有二次风暖风器进水调节阀18 ;所述低低温省煤器高温段6、低低温省煤器低温段9、一次风暖风器15和二次风暖风器12的本体均为蛇形管排，选用“H”型鳍片管。
[0026] 在空气预热器和静电除尘器之间烟道内布置低低温省煤器高温段6，高温段取水来自低压加热器的进出口，通过低低温省煤器进水管道5与汽轮机凝结水管路连接，通过控制低压加热器入口进水阀门I和低压加热器出口进水阀门2的开度调节低低温省煤器高温段6的进水温度。系统进水通过低低温省煤器高温段入口集箱6-1进入高温段本体，经蛇形管进入低低温省煤器高温段出口集箱6-2，然后通过低低温省煤器回水管道9进入除氧器入口。
[0027] 系统水路与汽轮机主凝结水并联布置，管道流阻由升压栗4克服。低低温省煤器进水管道设置止回阀3，防止系统水路逆流。低低温省煤器回水管道7设置低低温省煤器回水管道阀门8，便于系统切断。低低温省煤器高温段6本体为蛇形管排，选用“H”型鳍片管，吸收烟气余热将烟温降低到90°C左右。
[0028] 低低温省煤器低温段9布置在脱硫塔入口烟道内，与一次风暖风器15、二次风暖风器12组成闭式循环系统。首先系统内注满循环水，循环栗10提供循环动力，循环水在低温段内吸收烟气余热，经低低温省煤器低温段出口集箱9-2、低低温省煤器低温段出水管道11分别进入一次风暖风器入口集箱16和二次风暖风器入口集箱13，流经一次风暖风器15和二次风暖风器12放热，然后流入一次风暖风器出口集箱17和二次风暖风器出口集箱14，经汇合后流入低低温暖风器低温段回水管道20回至低低温省煤器低温段入口集箱9-1。
[0029] 低温省煤器低温段9本体为蛇形管排，材料选用氟塑料管，吸收烟气余热将烟温降低到50°C左右。氟塑料管具有较强的耐腐蚀性能，能够使受热面在50°C烟温水平内长期有效运行。一、二次风暖风器本体均为蛇形管排，选用“H”型鳍片管，吸收凝结水热量将风温提尚到60 C左右。
[0030] 通过控制二次风暖风器进水调节阀18和一次风暖风器进水调节阀19的开度，调整流入暖风器的水量，进而控制一、二次暖风器出口风温，利用烟气余热加热锅炉一、二次风，替代常规蒸汽暖风器。一、二次风温提高，从而使空气预热器出口烟温提高，提高到160°C左右，提升低低温省煤器高温段烟温利用水平，增加低低温省煤器高温段做功效率和节煤效益。
[0031] 低低温省煤器高温段、低温段和一、二次风暖风器为模块化布置，每组模块出、入口管道均设有阀门，可单独关闭相应模块，实现独立启停，便于检修。
Claims (6)
1.一种燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:在静电除尘器前烟道内安装低低温省煤器高温段(6)，在引风机出口至脱硫塔入口烟道内安装低低温省煤器低温段(9)，在一次风道内设置一次风暖风器(15)，在二次风道内设置二次风暖风器(12)，低低温省煤器高温段(6)与凝汽器凝结水管路连接，低低温省煤器低温段(9)通过低低温省煤器低温段出水管道(11)分别与一次风暖风器(15 )和二次风暖风器(12 )并联连接，一次风暖风器(15)和二次风暖风器(12)的出水管道与低低温省煤器低温段(9)的低低温省煤器低温段回水管道(20)连通。
2.根据权利要求1所述的燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:所述低低温省煤器高温段(6 )在低低温省煤器进水管道(5 )上安装升压栗(4 )和进水止回阀(3)，低低温省煤器进水管道(5)通过低压加热器出口进水阀门(2)和低压加热器入口进水阀门(I)连通两串联的低压加热器，低压加热器连通凝汽器；低低温省煤器高温段(6)的低低温省煤器回水管道(7)通过低低温省煤器回水管道阀门(8)连通除氧器。
3.根据权利要求1所述的燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:所述低低温省煤器高温段(6)上设置有低低温省煤器高温段入口集箱(6-1)和低低温省煤器高温段出口集箱(6-2)，低低温省煤器低温段(9)上设置有低低温省煤器低温段入口集箱(9-1)和低低温省煤器低温段出口集箱(9-2 )。
4.根据权利要求1所述的燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:所述一次风暖风器(15)上设置有一次风暖风器入口集箱(16)和一次风暖风器出口集箱(17) ;二次风暖风器(12)上设置有二次风暖风器入口集箱(13)和二次风暖风器出口集箱(14)。
5.根据权利要求1所述的燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征在于:所述一次风暖风器(15)的出水管上设置有一次风暖风器进水调节阀(19)，二次风暖风器(12)的出水管上设置有二次风暖风器进水调节阀(18)。
6.根据权利要求1所述的燃煤机组低低温省煤器联合送风加热深度余热回收系统，其特征为:所述低低温省煤器高温段(6)、低低温省煤器低温段(9)、一次风暖风器(15)和二次风暖风器(12)的本体均为蛇形管排，选用“H”型鳍片管。
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