CN111155088A - 垃圾焚烧发电锅炉水冷壁再制造方法 - Google Patents
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Abstract
针对锅炉水冷壁管排正、反面使用寿命严重不均的问题,本发明提供一种垃圾焚烧发电锅炉水冷壁再制造方法,该方法对原管排背面即再制造管排正面,利用复合梯度涂层表面强化技术在管排表面制备涂层;对原管排正面即再制造管排背面,利用合金堆焊表面修复技术加固强化处理;对原管排内管表面,利用化学镀修复与强化技术修复表面锈蚀层和疲劳微裂纹。从而实现了锅炉金属管排材料的循环利用,而且再制造水冷壁管排的成本仅占制造新管排的49.8%,契合国家循环经济的发展战略,具有该行业的开创性和相关领域的引领性。
Description
技术领域
本发明属于发电锅炉技术领域,尤其涉及一种垃圾焚烧发电锅炉水冷壁再制造方法。
背景技术
近年来,随着国家循环经济重大方针政策的贯彻执行,我国垃圾焚烧发电进入快速发展轨道,垃圾焚烧发电装机规模、发电量井喷式高速发展,目前居世界第一。水冷壁是锅炉的主要受热部分,是由管子和鳍片焊成的气密式结构,敷设在锅炉炉膛内壁组成的蒸发受热面。水冷壁的作用是吸收炉膛中高温火焰或烟气的辐射热量,在管内产生热水及蒸汽用于发电,同时降低炉墙温度,保护炉墙。炉内火焰温度最高接近900℃。锅炉中有超过50%的热量由水冷壁所吸收。
(1)水冷壁的失效原因
一是腐蚀、磨损、蠕胀、疲劳、过热等失效都将产生表面锈蚀坑、飞灰磨痕、疲劳微裂纹,从而引起受热面管道减薄,最终甚至发生爆管及泄露等事故,大大降低锅炉的使用寿命;
二是粘污、结渣、结垢会降低炉内受热面的传热能力。灰污在受热面沉积后,由于其导热系数很低,热阻很大,一般粘污数小时后水冷壁的传热能力会降低30%-60%,使得炉内温度相应提高。
(2)水冷壁的使用特点
由于原水冷壁受热面直接受到高温腐蚀和烟灰冲蚀,表面损伤较为严重。而水冷壁背面工作温度仅为100-200℃,报废时其背面基本完好无损,仅有管道内壁的锈蚀引起的少量减薄,约占管道背面厚度的5%以下。
(3)水冷壁的报废标准
国标将壁厚减薄30%视为报废门槛值。以使用较普遍的管道为例,管道受热面管厚从5mm减薄到3.5mm就可报废,考虑到国标存在安全裕度,企业往往会延时更换,实际上,绝大多数管排直到管厚为2-3mm才报废。
(4)管排再制造基础
每年全国共报废数十万平米近万吨的水冷壁管排,由于水冷壁管排正面和背面使用环境造成的失效的较大差异性,其中一半优质的合金材料未尽其用就被丢弃,造成了资源和制造能源极大浪费。
对报废管排的受热面进行分析,发现处于锅炉内的不同位置,如第一通道温度、压力、烟灰量等为最高,第二、三通道递减。即使在同一通道内,也由于距离燃烧核心区远近、高度等空间位置不同差别也很大,由此造成不同位置的管排受热面腐蚀、磨损的情况大不相同,最终造成服役寿命相差较大。然而,目前国标的报废标准只是管厚的平均减薄量(壁厚减少30%)一个指标。也正因如此,为报废管排的再制造提供了基础。
发明内容
基于现有的管排再制造基础,本发明提供一种垃圾焚烧发电锅炉水冷壁再制造方法,
一种垃圾焚烧发电锅炉水冷壁再制造方法,该方法对再制造毛坯的管排正、背面及管内的三个表面分别采用不同的表面工程技术进行再制造:
1)对原管排背面即再制造管排正面,利用复合梯度涂层表面强化技术在管排表面制备涂层:采用火焰喷涂自熔合金配合高频感应重熔的方法在管排表面制备涂层,即先用氧乙炔火焰喷涂厚自熔合金涂层,再用高频感应重熔线圈加热管排受热面使涂层材料重熔,使涂层孔隙率降低和结合强度提高。
2)对原管排正面即再制造管排背面,利用合金堆焊表面修复技术加固强化处理;
3)对原管排内管表面,利用化学镀修复与强化技术修复表面锈蚀层和疲劳微裂纹:首先用酸洗+高压水清洗表面并实现表面活化;再采用泵吹法化学镀镍或不锈钢方法实现管内表面的修复和强化。
进一步的,所述再制造毛坯可从报废管排中筛选,筛选标准:受热面无爆口,减薄后壁厚仍在2.3mm以上的管排。因为在焚烧炉内不同位置的管排温度和腐蚀程度都不同,但报废标准就一个,就是管壁腐蚀减薄30%。这样就可以从报废拆下来的管排中挑选约占报废管排总量的60%以上的做再制造。
进一步的,再制造之前要做准备工作:对所述再制造毛坯进行磨除残余涂层、管排正反面喷砂处理、内孔酸洗及高压水清理并活化表面。
进一步的,再制造之后要做优化工作:对再制造过程中产生的二次热变形进行矫正,并完成再制造质量检测。
技术效果
(1)金属管排材料循环利用、绿色环保
针对锅炉水冷壁管排正、反面使用寿命严重不均的问题,国内外首次提出了以报废管排为毛坯进行再制造并翻面使用的概念,从而实现了锅炉金属管排材料的循环利用,契合国家循环经济的发展战略,具有该行业的开创性和相关领域的引领性。
(2)成本低、市场前景大
再制造水冷壁管排成本4310元/平米,制造新管排成本8660元/平米,制造水冷壁管排性价比具有独特的竞争优势,再制造水冷壁管排的成本仅占新品的49.8%。
(3)再制造的管排毛坯原料有保证
国内目前有垃圾焚烧发电厂500余个,平均每个厂有2台中型锅炉,平均每台锅炉有水冷壁1000m2,以每年报废水冷壁管排100m2(10%)计,其中50m2可再制造,则每年将有超过5万平米的再制造水冷壁管排作为再制造管排毛坯。而且随着国家对新能源特别是对垃圾焚烧发电技术的大力支持,垃圾焚烧发电企业的数量和规模无疑将逐年快速增加,因此可预测到水冷壁管排再制造的原料市场前景非常广阔。
具体实施方式
图1是本发明的垃圾焚烧发电锅炉水冷壁再制造方法工艺流程图,如图1所示,本方法包括以下内容:
(1)再制造毛坯筛选
到垃圾电厂按废品价格收购报废管排,在报废管排中挑选出受热面无爆口、整体热变形及受热面外观损伤相对较轻,减薄后壁厚仍在2.3mm以上的管排(约占报废管排总量的60%以上),将其作为再制造毛坯。
(2)翻面使用。
由于对报废管排是再制造后翻面使用,此受热面为原管排的背面,该表面在原服役环境下仅为温度100-200℃。从理论上说,在此温度下可服役15年以上,而实际上大多仅使用了3-5年,因此管排材料还有70%以上的潜能没有发挥出来。况且又经过再制造内外同时强化与加固,相当于给管排外穿盔甲内穿紧身衣,所以其强度和寿命不会低于新品。
(3)再制造方案与工艺设计。
根据再制造设计的等寿命原则,对管排正、背面及管内的三个表面进行再制造方案设计,设计原则为保证使再制造管排的质量接近新品,使用寿命接近新管排,且售价则不超过新品的50%。
管排再制造准备:采用专用工装对再制造毛坯进行变形矫正,并用手持砂轮磨除残余涂层;对管排正反面喷砂处理;内孔酸洗+高压水清理并活化表面。
(4)针对报废管排的再制造表面修复与强化技术。
对原管排背面即再制造管排正面的复合梯度涂层表面强化技术,对原管排正面即再制造管排背面的合金堆焊表面修复技术,针对内管表面的化学镀修复与强化技术等。
1)受热面强化。管排的寿命主要取决于受热面的寿命。由于报废管排是再制造后翻面使用,该受热面为原管排的背面,该面材料的强度及性能还有70%以上的潜能没有发挥。对于原新管排受热面涂层的制备,采用火焰喷涂自熔合金进行表面火焰喷涂底层(厚约0.5mm)+高频感应重熔的方法在管排表面制备涂层+超音速等离子喷涂面层,能耐650℃高温,防腐性能明显优于传统堆焊,加热温度约1000℃。
2)针对原管排正面即再制造管排背面的表面强化技术
该表面因长期高温腐蚀和磨损造成损伤较严重,致使表面减薄严重,且表面存在锈蚀坑、飞灰磨痕以及疲劳微裂纹,尽管将应用到服役环境较好的管排背面,但背面仍然要承受一定的压力,因此需施行加固强化处理。采用与管排基体材料(20g)相近的合金焊条堆焊,对管排背面用堆焊合金材料修复损伤及恢复强度。虽然该材料防腐耐磨性能一般,但高温强度好且价格低廉。堆焊层厚度约2mm,堆焊后接近了原管的原始厚度,而且对于修复和改善管排的疲劳强度和蠕变性能效果显著。
3)针对内管表面的修复与强化技术
内管的主要失效形式是高压水蒸气引起的锈蚀和水垢,同时也存在一些表面微裂纹。首先用酸洗+高压水清洗表面并实现表面活化;再采用泵吹法化学镀镍(或不锈钢)方法实现管内表面的修复和强化。镀层厚度约0.05mm。虽然厚度较薄,但由于化学镀的特点是镀层与基体间是化学键结合,不仅结合强度比喷涂和电镀好,而且可有效修复表面锈蚀层和疲劳微裂纹。泵吹法化学镀镍(不锈钢)方法简便高效,不需任何大型专用设备,特别适合水冷壁管排这种大型异形件长内孔的表面修复与强化。
(5)对再制造过程中产生的二次热变形进行矫正,并完成再制造质量检测。
本发明的再制造水冷壁管排性价比具有独特的竞争优势
1)与新品对比成本
由上可见,再制造水冷壁管排的成本仅占新品的49.8%。
目前国内锅炉水冷壁管排受热面普遍采用堆焊625合金的方法,堆焊厚度一般为1.5mm-2mm,可耐550℃高温,但由于625合金焊条为390元/kg,所以成本居高不下。近年来江苏科环新材料有限公司在国内率先采用火焰喷涂自熔合金+高频感应重熔的复合方法在管排表面制备涂层,具备孔隙率低、结合强度好的优点,能耐650℃高温,防腐性能明显优于传统堆焊。而且由于自研的自熔合金价低质优,且厚度仅为0.8mm,所以成本远低于传统堆焊。再制造水冷壁管排的成本仅占新品的49.8%。
目前国内锅炉水冷壁管排受热面普遍采用堆焊625合金的方法,堆焊厚度一般为1.5mm-2mm,可耐550℃高温,但由于625合金焊条为390元/kg,所以成本居高不下。近年来江苏科环新材料有限公司在国内率先采用火焰喷涂自熔合金+高频感应重熔的复合方法在管排表面制备涂层,具备孔隙率低、结合强度好的优点,能耐650℃高温,防腐性能明显优于传统堆焊。而且由于自研的自熔合金价低质优,且厚度仅为0.8mm,所以成本远低于传统堆焊。
Claims (6)
1.一种垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,该方法对再制造毛坯的管排正、背面及管内的三个表面分别采用不同的表面工程技术进行再制造:
对原管排背面即再制造管排正面,利用复合梯度涂层表面强化技术在管排表面制备涂层;对原管排正面即再制造管排背面,利用合金堆焊表面修复技术加固强化处理;对原管排内管表面,利用化学镀修复与强化技术修复表面锈蚀层和疲劳微裂纹。
2.如权利要求1所述的垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,对原管排内管表面,利用化学镀修复与强化技术修复表面锈蚀层和疲劳微裂纹,具体内容是:首先用酸洗+高压水清洗表面并实现表面活化;再采用泵吹法化学镀镍或不锈钢方法实现管内表面的修复和强化。
3.如权利要求1所述的垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,对原管排背面即再制造管排正面,利用复合梯度涂层表面强化技术在管排表面制备涂层,具体内容是:
采用火焰喷涂自熔合金配合高频感应重熔的方法在管排表面制备涂层,即先用氧乙炔火焰喷涂厚自熔合金涂层,再用高频感应重熔线圈加热管排受热面使涂层材料重熔,使涂层孔隙率降低和结合强度提高。
4.如权利要求1所述的垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,所述再制造毛坯可从报废管排中筛选,筛选标准:受热面无爆口,减薄后壁厚仍在2.3mm以上的管排。
5.如权利要求1所述的垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,再制造之前准备工作:对所述再制造毛坯进行磨除残余涂层、管排正反面喷砂处理、内孔酸洗及高压水清理并活化表面。
6.如权利要求1所述的垃圾焚烧发电锅炉水冷壁再制造方法,其特征在于,再制造之后优化工作:对再制造过程中产生的二次热变形进行矫正,并完成再制造质量检测。
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