锅炉改造提高了效率,增加了生物质燃烧率

S. Pethe, Paul W. Cloninger, Ryan R. Shortreed, Ken M. Hardison
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摘要

Domtar公司位于美国北卡罗来纳州普利茅斯的绒毛纸浆厂运营着两台生物质/生猪燃料锅炉(HFBs)。为了整合能源和提高可靠性,Domtar公司希望退役1号HFB,并对2号HFB进行翻新/改造。2号HFB设计用于在移动篦上燃烧煤粉和/或生物质。蒸汽量为煤50万磅/小时,生物质40万磅/小时。然而,它从未维持这种设计的生物质蒸腾速率。作为唯一的动力锅炉,2号HFB在高峰负荷期间需要维持400,000 lb/h的生物质蒸汽。由一家燃烧和锅炉技术供应商进行了广泛的评估。评估包括现场测试、分析和计算流体动力学(CFD)建模,并确定了实现2号HFB生物质蒸汽目标的几个瓶颈和缺陷。这些瓶颈包括不完善的燃烧系统;热捕获不足;燃烧空气温度过高;甜水冷凝器(SWC)容量不足;并且引风机容量有限。为了解决已识别的缺陷,设计并实现了各种升级。这些升级包括现代气动燃油分配器;一个现代化的侧壁,交错过火空气(OFA)系统;一个新的,更大的省煤器;改进给水管,增加SWC容量;用干式静电除尘器更换洗涤器;升级锅炉控制系统。随着这些升级的部署,2号HFB实现了400,000 lb/h的目标生物质蒸腾速率,同时降低了烟囱气体和燃烧空气温度。在500,000 lb/h蒸汽和400,000 lb/h生物质蒸汽的条件下,所有规定的排放限值测试都通过了,Domtar报告称,燃料燃烧率降低了10%,这意味着显著节省了燃料。此外,该工厂能够使1号HFB退役,这大大降低了运营和维护成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Boiler retrofit improves efficiency and increases biomass firing rates
Domtar’s fluff pulp mill in Plymouth, NC, USA, operates two biomass/hog fuel fired boilers (HFBs). For energy consolidation and reliability improvement, Domtar wanted to decommission the No. 1 HFB and refurbish/retrofit the No. 2 HFB. The No. 2 HFB was designed to burn pulverized coal and/or biomass on a traveling grate. The steaming capacity was 500,000 lb/h from coal and 400,000 lb/h from biomass. However, it had never sustained this design biomass steaming rate. As the sole power boiler, the No. 2 HFB would need to sustain 400,000 lb/h of biomass steam during peak loads. An extensive evaluation by a combustion and boiler technologies supplier was undertaken. The evaluation involved field testing, analysis, and computational fluid dynamics (CFD) modeling, and it identified several bottle-necks and deficiencies to achieving the No. 2 HFB’s biomass steam goal. These bottlenecks included an inadequate combustion system; insufficient heat capture; excessive combustion air temperature; inadequate sweetwater con-denser (SWC) capacity; and limited induced draft fan capacity. To address the identified deficiencies, various upgrades were engineered and implemented. These upgrades included modern pneumatic fuel distributors; a modern sidewall, interlaced overfire air (OFA) system; a new, larger economizer; modified feedwater piping to increase SWC capacity; replacement of the scrubber with a dry electro-static precipitator; and upgraded boiler controls. With the deployment of these upgrades, the No. 2 HFB achieved the targeted biomass steaming rate of 400,000 lb/h, along with lowered stack gas and combustion air temperatures. All mandated emissions limit tests at 500,000 lb/h of steam with 400,000 lb/h of biomass steam were passed, and Domtar reports a 10% reduction in fuel firing rates, which represents significant fuel savings. In addition, the mill was able to decommission the No. 1 HFB, which has substantially lowered operating and maintenance costs.
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