CN105806109B - 用于气-气热交换的逆流式翅片板换热器 - Google Patents

用于气-气热交换的逆流式翅片板换热器 Download PDF

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CN105806109B
CN105806109B CN201610170952.7A CN201610170952A CN105806109B CN 105806109 B CN105806109 B CN 105806109B CN 201610170952 A CN201610170952 A CN 201610170952A CN 105806109 B CN105806109 B CN 105806109B
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heat exchange
gas
plate
heat exchanger
fin
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CN105806109A (zh
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凌祥
杨谕
彭浩
李�瑞
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Nanjing Tech University
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Nanjing Tech University
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Priority to SE1851165A priority patent/SE544275C2/en
Priority to PCT/CN2017/075708 priority patent/WO2017162018A1/zh
Priority to US16/087,104 priority patent/US10378831B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0025—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by zig-zag bend plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0022—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for chemical reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0006—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the plate-like or laminated conduits being enclosed within a pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F2009/0285—Other particular headers or end plates
    • F28F2009/0297—Side headers, e.g. for radiators having conduits laterally connected to common header
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/102—Particular pattern of flow of the heat exchange media with change of flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/104—Particular pattern of flow of the heat exchange media with parallel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/106—Particular pattern of flow of the heat exchange media with cross flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/108—Particular pattern of flow of the heat exchange media with combined cross flow and parallel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding

Abstract

本发明公开了一种用于气‑气热交换的逆流式翅片板换热器，包含若干外部通道翅片、外部通道折弯板、内部通道翅片和内部通道折弯板，外部通道折弯板为两侧向上侧垂直弯折的平板，内部通道折弯板为上端无盖的长方体盒体并且内部通道折弯板上端与外部通道折弯板下侧密封固定，若干外部通道翅片平行设置在外部通道折弯板内侧，内部通道翅片设置在内部通道折弯板内侧，内部通道折弯板两条长边对应的侧面端部设置有一个开口并且两个开口分别设置在两侧侧面的不同端。本发明设备紧凑，换热效果强，便于安装，能有效防止腐蚀。

Description

用于气-气热交换的逆流式翅片板换热器
技术领域
本发明涉及一种换热器，特别是一种用于气-气热交换的逆流式翅片板换热器。
背景技术
钢铁工业和化工工业是我国的基础产业，这些行业中众多的工业加热炉、燃气燃油锅炉烟气的排放温度均在150℃以上，烟气中含有的显热及水蒸汽所含的汽化潜热非常大，直接排放不仅极大的浪费了能源，还增加了污染物的排放。同时，部分钢铁行业的能源利用率只有30-50%，生产过程中浪费了大量的余热，而这些余热可以合理回收并用于提高助燃空气或煤气的温度，产生水蒸汽发电和生活供热等。随着我国现代工业对能源需求的持续增加，余热回收的重要性也与日俱增，如何对余热进行高效回收利用已经成为节能减排的热点问题。
换热器作为余热回收系统的核心部件，提高换热器的传热性能对余热回收的发展具有重要意义。换热器可以分为管式换热器、板式换热器、热管换热器和板面式换热器。相对于普通管式换热器，板式换热器和板面式换热器从换热元件的形状和表面结构来实现强化传热。
在余热回收过程中，随着烟气温度降低，换热器阻力降和可能发生的结垢、腐蚀现象是阻碍余热回收系统发展的重要因素之一。目前，在余热回收领域，由于烟气回收的热量大，传统的管式、翅片管式和板式换热器占用安装空间大，且抗腐蚀能力较差。
发明内容
本发明所要解决的技术问题是提供一种用于气-气热交换的逆流式翅片板换热器，它烟气侧阻力小，不容易积灰，可有效防止露点腐蚀。
为解决上述技术问题，本发明所采用的技术方案是：
一种用于气-气热交换的逆流式翅片板换热器，其特征在于：若干组逆流式翅片板沿厚度方向叠加固定组成换热单元体，两个空气通道固定在换热单元体两侧并且分别与换热单元体两侧的逆流式翅片板的内部通道折弯板侧面开口连通，若干换热单元体横向叠加固定构成换热单元体组，若干换热单元体组沿竖直方向叠加并且相邻换热单元体组之间通过烟气通道连接，若干换热单元体组外侧通过支撑框架固定，支撑框架外侧设置有换热器壳体，空气在换热器内沿着空气通道呈S型流动。
进一步地，所述换热器壳体包含空气进口封头、空气侧密封罩、空气进口侧封板、封板、烟气进口法兰、空气出口封头、空气出口侧封板、换热器芯体和烟气出口法兰，空气进口侧封板、封板和空气出口侧封板构成长方体空心筒体并且固定在支撑框架外侧，烟气进口法兰和烟气出口法兰分别固定在长方体空心筒体上端和下端，空气进口侧封板和空气出口侧封板上对应换热单元体的开口位置开有通孔，空气进口封头固定在空气进口侧封板下端并且与空气进口侧封板最下端通孔连通，空气出口封头固定在空气出口侧封板上端并且与空气出口侧封板最上端通孔连通，空气侧密封罩固定在空气进口侧封板上并且与相邻两组通孔连通，所述相邻两组通孔分别对应两个相邻的换热单元体的开口。
进一步地，所述换热器壳体中间采用波纹或者矩形变径结构。
进一步地，所述逆流式翅片板包含若干外部通道翅片、外部通道折弯板、内部通道翅片和内部通道折弯板，外部通道折弯板为两侧向上侧垂直弯折的平板，内部通道折弯板为上端无盖的长方体盒体并且内部通道折弯板上端与外部通道折弯板下侧密封固定，若干外部通道翅片平行设置在外部通道折弯板内侧，内部通道翅片设置在内部通道折弯板内侧，内部通道折弯板两条长边对应的侧面端部设置有一个开口并且两个开口分别设置在两侧侧面的不同端。
进一步地，所述外部通道折弯板和内部通道折弯板的两端设置有导流结构。
进一步地，所述导流结构为导流片。
进一步地，所述导流结构为球冠，球冠呈交错分布，两球冠间距为球冠底部圆的直径的2~4倍，球冠底部圆的直径小于2倍的翅片间距。
进一步地，所述外部通道折弯板弯折高度比若干外部通道翅片高度多0.5~1mm，内部通道折弯板侧边高度比内部通道翅片高度多0.5~1mm。
进一步地，所述内部通道折弯板两侧侧面开口长度与开口距离内部通道折弯板侧面端部距离之和为内部通道折弯板总长度的1/8~1/6。
进一步地，所述内部通道翅片和外部通道翅片采用平直形、锯齿形、三角形或多孔形翅片。
本发明与现有技术相比，具有以下优点和效果：
1、 烟气侧阻力小，不容易积灰，可有效防止露点腐蚀；
2、换热器由多个换热单元组装而成，安装拆卸方便，结构紧凑，设备制造安装简单，换热效率高；
3、设备成本低，采用新的串、并联连接、封板与支撑框架结合的组装方法和高效换热结构，适合用于大型余热回收系统中。
附图说明
图1是本发明的换热器的外形图。
图2是本发明的换热器的分散图。
图3是本发明的逆流式翅片板的示意图。
图4是本发明的换热单元体示意图。
图5是本发明的换热器的组装示意图。
图6是本发明的换热器壳体的示意图。
具体实施方式
下面结合附图并通过实施例对本发明作进一步的详细说明，以下实施例是对本发明的解释而本发明并不局限于以下实施例。
本发明的换热器主要由换热器箱体、外部构件和换热器芯体组成，烟气从上向下流进，与侧边进入的空气进行换热。两种换热介质呈逆流流动。
一种用于气-气热交换的逆流式翅片板换热器，若干组逆流式翅片板沿厚度方向叠加固定组成换热单元体801，两个空气通道802固定在换热单元体两侧并且分别与换热单元体801两侧的逆流式翅片板的内部通道折弯板侧面开口连通，若干换热单元体801横向叠加固定构成换热单元体组，若干换热单元体组沿竖直方向叠加并且相邻换热单元体组之间通过烟气通道803连接，若干换热单元体组外侧通过支撑框架804固定，支撑框架外侧设置有换热器壳体，空气在换热器内沿着空气通道802呈S型流动。换热器单元体801按从下至上分层组装，每层由若干个换热单元体组成一组，一般地，一组换热单元体的数量为1~5，上下分1~4组布置，换热单元体801数量可根据换热需求做相应变化。换热单元体801两侧焊有空气通道802，从而使得空气能从空气通道802流进和流出若干翅片板101。上下两层中的换热单元体801由烟气通道803一一对应串联焊接。支撑框架804由采用304不锈钢槽钢和方钢，与换热单元体801和空气通道802接触部分焊接，支撑框架804主要对芯体起支撑作用，并充当骨架方便换热器箱体焊接。支撑框架804组装完成后，进行焊接换热器箱体。最后依次焊接换热器箱体的封板4和其他外部构件。根据换热器温度分布不同，若采用上下两组换热单元体，且烟气温度由较高的温度降至露点温度以下，上组换热单元体的翅片板可采用镍基钎焊，下组采用铜基钎焊。若折弯板上采用多层翅片，相邻翅片的间距为2~6mm，该尺寸可以保证烟气侧的传热性能和阻力大小。
换热器壳体包含空气进口封头1、空气侧密封罩2、空气进口侧封板3、封板4、烟气进口法兰5、空气出口封头6、空气出口侧封板7、换热器芯体8和烟气出口法兰9，空气进口侧封板3、封板4和空气出口侧封板7构成长方体空心筒体并且固定在支撑框架804外侧，烟气进口法兰5和烟气出口法兰9分别固定在长方体空心筒体上端和下端，空气进口侧封板3和空气出口侧封板7上对应换热单元体的开口位置开有通孔，空气进口封头1固定在空气进口侧封板3下端并且与空气进口侧封板3最下端通孔连通，空气出口封头6固定在空气出口侧封板7上端并且与空气出口侧封板7最上端通孔连通，空气侧密封罩2固定在空气进口侧封板3上并且与相邻两组通孔连通，该相邻两组通孔分别对应两个相邻的换热单元体的开口。空气进口侧封板3、封板4和空气出口侧封板7采用埋弧焊，焊接在换热器芯体8四周。
烟气从烟气进口法兰5流进换热器芯体8，从烟气出口法兰9流出。空气从空气进口封头1流进，通过下层各个空气通道802分别流入换热单元体801，然后经空气侧密封罩2实现空气上下串联流通，经上层换热单元体801后流出，最后通过空气出口封头6向外输送加热后的空气。换热器壳体中间采用波纹或矩形变径结构，以避免该换热装置在温度较高运行中热膨胀产生的变形。整个换热器材料为304或316L不锈钢，整个换热器完成后需进行气密性试验。其翅片板中折弯板和翅片的表面采用镀靶技术处理，大大提高换热器的耐腐蚀性能，延长换热器寿命。
逆流式翅片板包含若干外部通道翅片102、外部通道折弯板103、内部通道翅片104和内部通道折弯板105，外部通道折弯板103为两侧向上侧垂直弯折的平板，内部通道折弯板105为上端无盖的长方体盒体并且内部通道折弯板105上端与外部通道折弯板103下侧密封固定，若干外部通道翅片102平行设置在外部通道折弯板103内侧，内部通道翅片104设置在内部通道折弯板105内侧，内部通道折弯板105两条长边对应的侧面端部设置有一个开口并且两个开口分别设置在两侧侧面的不同端。折弯板103内为外部通道翅片102，烟气从其中流过；折弯板105内为内部通道翅片104，空气从其中流走，翅片层数根据换热效果来确定，翅片形状可根据需求做相应改变。折弯板103和105进行折弯，其中折弯板105经过折弯后，侧边相接位置进行焊接，折弯高度h比相应翅片高度多0.5~1mm。其中，折弯板105的流体进口处的开口长度l2和距折弯板边缘的长度l1之和为折弯板长度L的1/8~1/6，l1不宜过短，可取30~50mm。折弯板103和105采用导流片或者冲压成型的球冠作为导流结构，其中折弯板103和105上的球冠呈交错分布，两球冠间距为球冠底部圆的直径的2~4倍，球冠底部圆的直径小于2倍的翅片间距。相邻的翅片板101采用氩弧焊接工艺进行焊接，翅片板101采用折弯板连接技术可以简化制造程序，减小焊接点，从而减小焊接应力、减少漏点。若干翅片板101焊接组成换热单元体801，翅片板101的数量根据换热需求来定，各个换热单元体801焊接完成后，其内部通道进行气密性试验和水压试验，保证翅片板101内部通道的密封性和承压性能以及检验各翅片板101之间焊接的质量。
翅片板内部通道和外部通道翅片可采用平直形、锯齿形、三角形或多孔形翅片，翅片可为多层。若烟气含极少固体悬浮物，外部通道翅片采用锯齿型翅片，强化换热，便于水份析出；若烟气含较多固体悬浮物，采用平直形或多孔形翅片，能够有效防止颗粒、水份的附着，不容易堵塞。作为一种优选，所述外部翅片的高度大于等于6mm，该尺寸的翅片可有效防止结垢。若干外部通道翅片采用两层型号为90SJ6002的三角形翅片，内部通道翅片采用型号为12JC4002的锯齿形翅片。
用于气-气热交换的逆流式翅片板换热器将一个加热炉烟气降至180℃以下。设计工况为：9.83kg/s烟气从320℃降至170℃，8.63kg/s空气从67预热至260℃，烟气侧和空气侧压降分别不低于0.4kPa、0.5kPa，烟气成分如下表1所示。
表1烟气组分
组分 CO2 H2O O2 N2 SO2
体积分数% 15.3 12.7 2.2 69.8 2.85ppm
经计算，烟气侧翅片采用两层三角形翅片，翅片型号为90SJ6002；空气侧翅片采用单层锯齿形翅片，翅片型号为12JC4002。折弯板103和105的厚度为1.2mm，高度分别为21.2mm和13.2mm，长度为1000mm。翅片板101有效长度（带翅片）为400mm，换热单元体801共6个，每个换热单元体801含70片翅片板101。按具体实施方式组装完成后，本实施例的用于烟气余热回收的逆流翅片板式换热器总尺寸为5600×2900×4770。其中，横向换热单元体间距为164mm，纵向间距（烟气通道高）为300mm。为满足该换热器强度要求，支撑框架801选用160×65×8.5槽钢和60×6等边角钢。该换热器可回收1690kW热量。
本说明书中所描述的以上内容仅仅是对本发明所作的举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种修改或补充或采用类似的方式替代，只要不偏离本发明说明书的内容或者超越本权利要求书所定义的范围，均应属于本发明的保护范围。

Claims (9)

1.一种用于气-气热交换的逆流式翅片板换热器，其特征在于：若干组逆流式翅片板沿厚度方向叠加固定组成换热单元体，两个空气通道固定在换热单元体两侧并且分别与换热单元体两侧的逆流式翅片板的内部通道折弯板侧面开口连通，若干换热单元体横向叠加固定构成换热单元体组，若干换热单元体组沿竖直方向叠加并且相邻换热单元体组之间通过烟气通道连接，若干换热单元体组外侧通过支撑框架固定，支撑框架外侧设置有换热器壳体，空气在换热器内呈S型流动；
所述换热器壳体包含空气进口封头、空气侧密封罩、空气进口侧封板、封板、烟气进口法兰、空气出口封头、空气出口侧封板、换热器芯体和烟气出口法兰，空气进口侧封板、封板和空气出口侧封板构成长方体空心筒体并且固定在支撑框架外侧，烟气进口法兰和烟气出口法兰分别固定在长方体空心筒体上端和下端，空气进口侧封板和空气出口侧封板上对应换热单元体的开口位置开有通孔，空气进口封头固定在空气进口侧封板下端并且与空气进口侧封板最下端通孔连通，空气出口封头固定在空气出口侧封板上端并且与空气出口侧封板最上端通孔连通，空气侧密封罩固定在空气进口侧封板上并且与相邻两组通孔连通，所述相邻两组通孔分别对应两个上下相邻的换热单元体组中的空气通道的开口。
2.按照权利要求1所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述换热器壳体中间采用波纹或者矩形变径结构。
3.按照权利要求1所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述逆流式翅片板包含若干外部通道翅片、外部通道折弯板、内部通道翅片和内部通道折弯板，外部通道折弯板为两侧向上侧垂直弯折的平板，内部通道折弯板为上端无盖的长方体盒体并且内部通道折弯板上端与外部通道折弯板下侧密封固定，若干外部通道翅片平行设置在外部通道折弯板内侧，内部通道翅片设置在内部通道折弯板内侧，内部通道折弯板两条长边对应的侧面端部设置有一个开口并且两个开口分别设置在两侧侧面的不同端。
4.按照权利要求3所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述外部通道折弯板和内部通道折弯板的两端设置有导流结构。
5.按照权利要求4所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述导流结构为导流片。
6.按照权利要求4所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述导流结构为球冠，球冠呈交错分布，两球冠间距为球冠底部圆的直径的2~4倍。
7.按照权利要求3所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述外部通道折弯板弯折高度比若干外部通道翅片高度多0.5~1mm，内部通道折弯板侧边高度比内部通道翅片高度多0.5~1mm。
8.按照权利要求3所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述内部通道折弯板两侧侧面开口长度与开口距离内部通道折弯板侧面端部距离之和为内部通道折弯板总长度的1/8~1/6。
9.按照权利要求3所述的用于气-气热交换的逆流式翅片板换热器，其特征在于：所述内部通道翅片和外部通道翅片采用平直形、锯齿形、三角形或多孔形翅片。
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