摘要:火电建设工程中锅炉大板梁吊装是整个建设过程中技术含量最高、难度最大、协调指挥最复杂的重要节点工程之一。本文对比了1000MW机组锅炉大板梁吊装的两种常见吊装方案,即大板梁单机吊装与双机抬吊方案,主要对比了两种不同吊装方法在进度、成本方面的区别。比较认为,单机吊装能够加快吊装速度,相对吊装机械费用较高,加大了吊装成本。双机抬吊方式阵低了吊装机械费用,却延缓了吊装进度。在实践中如何选用,主要取决于吊装、运输机械资源配备、施工工期、大板梁到货情况、两台锅炉安装进度等诸多因素,吊装方案应视具体情况而定。
关键词:锅炉大板梁;单机吊装;双机抬吊;比较
中图分类号:T 文献标志码:B 文章编号:
Comparison of hoisting schemes for girders of 1000MW boilers
CHEN Hongjian
(1. Shandong Environment Protection Industrial Research Institute, Jinan 250014, China;)
Abstract:In the thermal power construction project, the hoisting of the girders of the boiler is one of the important node projects with the highest technical content, the most difficulty and the most complicated coordination and command in the whole construction process. This paper compares two common hoisting schemes for 1000MW boiler girders, namely single crane hoisting anddouble cranes hoisting scheme, and mainly compares the difference in progress and cost. In comparison, single-machine hoisting can speed up the hoisting, but the cost of hoisting machinery is relatively high, which increases the hoisting cost. The double-machine hoisting method reduces the cost of hoisting machinery, but slows down the hoisting progress. The chosen in practice mainly depends on many factors such as hoisting, transportation machinery resource allocation, construction period, the arrival of girders, and the installation progress of the two boilers. The hoisting plan should be determined according to the specific situation..
Key words:Boiler girders; Singlecrane hoisting; Double cranes hoisting; Comparison
0引言
随着我国国民经济和电力行业的快速发展,600MW、1000MW级机组已经成为我国火力发电机组的主流[1]。锅炉设备参数越来越高,锅炉大板梁的重量也越来越大,1000MW机组锅炉最重大板梁的重量达到近160吨,就位高度近90米,其吊装就位已成为机组安装的重点难点[2]。本文对比总结了两种主流的大板梁吊装方案:单机吊装和双机抬吊就位方案,以期为相似工程大板梁吊装提供借鉴。
1锅炉概况
本文以上海锅炉(集团)股份有限公司生产的超超临界参数变压运行直流炉,单炉膛、一次中间再热、双切圆燃烧方式、平衡通风、干式固态排渣、全钢悬吊结构、∏型、露天布置燃煤1000MW锅炉机组为例进行说明。锅炉构架为全钢结构,锅炉几何尺寸为73060mm(宽度)×73810mm(深度)。锅炉大板梁共5根,分别为K2、K3、K4、K5、K6板梁,位于K2、K3、K4、K5、K6排轴线上,其中K2~K5板梁为上下叠梁,K6板梁共两根,沿炉膛中心线对称布置大板梁安装标高约为88m。各板梁具体尺寸、重量如表1。
表1 1000MW锅炉机组大板梁参数
无纺布折叠机板梁名称 | 单重 (t) | 数量 (根) | 外形尺寸 自动包装机器人(长×宽×高mm) |
K2上梁 | 115.3 | 1 | 44660×450/1250×3750 |
K2下梁 | 117.6 | 1 | 44660×500/1250×3750 |
K3上梁 | 氨苄西林颗粒147.5 | 1 | 44660×500/1250×4000 |
K3下梁 | 150.4 | 1 | 44660×550/1250×4000 |
压铸机料筒的设计K4上梁 | 152.5 | 1 | 44660×500/1500×4000 |
K4下梁 | 155.6 | 1 | 44660×550/1500×4000 |
K5上梁 | 143.2 | 1 | 44660×500/1350×4000 |
变速箱试验台K5下梁 | 146.1 | 3837Cc 1 | 44660×550/1350×4000 |
K6板梁 | 32.4 | 2 | 21798×650×3350 |
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锅炉叠式大板梁采用分体吊装方案,下梁安装就位后,再吊装上梁。上梁在下梁体上正,穿入高强螺栓,空中组合安装。叠梁叠合面采用大六角高强螺栓和大六角高强螺栓两种螺栓连接,板梁次梁、炉顶支撑结构采用扭剪型高强螺栓连接安装,高处组合的方式进行安装。