Co-firing of coal and woody biomass under conditions of reburning technology with natural gas

N. Hodžić, Kenan Kadić
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引用次数: 1

Abstract

It is a continuous imperative to establish the most efficient process of conversion of primary energy from fuel through combustion, which also has the least possible harmful effect on the environment. In this time of expressed demands for decarbonisation, it also means the affirmation of the use of renewable fuels and the indispensable application of appropriate primary measures in the combustion furnace. At the same time, the efficiency of the combustion process depends on several factors, from the type and properties of the fuel to the ambient and technological settings for the process. In this regard, with the aim of determining the static characteristics of combustion, experimental laboratory research was carried out on the combustion of mixtures of brown coal with low heating value and a high ash content with waste woody biomass and different process conditions: temperature, staged combustion air supply (air staging) and in conditions of application of a third or additional fuel (natural gas, reburning technology). Applied experimental methods included the analysis of the combustion process on the basis of input (reactants) - output (products), including the analysis of the composition of flue gases, i.e. the determination of the emission of the key components of flue gases CO2, CO, NOx and SO2, as well as the analysis of the composition of slag, ash and deposits ash, i.e. assessment and evaluation of the behaviour of ash from fuel in that process. Based on the obtained research results, this paper shows the significant positive effects of the application of primary measures in the furnace - compared to conventional combustion: air staging - reduction of net CO2 emissions during co-firing with biomass and reduction of NOx emissions by up to 30%; reburning technology - additional reduction of CO2 and NOx emissions in proportion to the share of natural gas, e.g. at a combustion process temperature of 1350 °C and at a 10% energy share of natural gas during the co-firing of a mixture of brown coal and waste woody biomass, compared to the emission without the use of natural gas, a reduction of NOx emissions by 185 mg/mn3 or by almost 30% was recorded. It was concluded, at the same time, the application of these primary measures in the furnace does not negatively affect the behaviour of ash from the fuel in the given settings of the combustion process.
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煤与木质生物质在天然气再燃技术条件下的共燃
建立从燃料到燃烧的最有效的一次能源转换过程,同时对环境的有害影响也尽可能小,这是一个持续的当务之急。在这个对脱碳提出明确要求的时代,这也意味着肯定使用可再生燃料,并在燃烧炉中采取必要的适当初级措施。同时,燃烧过程的效率取决于几个因素,从燃料的类型和性质到过程的环境和技术设置。在这方面,为了确定燃烧的静态特性,对低热值和高灰分含量的褐煤与废木质生物质的混合物在不同的工艺条件下的燃烧进行了实验研究:温度,分阶段燃烧空气供应(空气分段)以及应用第三种或额外燃料(天然气,再燃烧技术)的条件。应用的实验方法包括在输入(反应物)-输出(产品)的基础上分析燃烧过程,包括分析烟道气的成分,即确定烟道气的关键成分CO2、CO、NOx和SO2的排放量,以及分析炉渣、灰分和沉淀物灰分的成分,即评估和评价来自燃料的灰分在该过程中的行为。根据获得的研究结果,本文显示了在炉中应用主要措施的显着积极效果-与传统燃烧相比:空气分级-减少与生物质共烧时的净二氧化碳排放量,减少NOx排放量高达30%;再燃烧技术——按天然气的比例进一步减少二氧化碳和氮氧化物的排放,例如,在燃烧过程温度为1350°C时,在褐煤和废木质生物质混合物共烧期间,天然气的能量份额为10%,与不使用天然气的排放相比,记录的氮氧化物排放量减少了185 mg/mn3或近30%。同时得出的结论是,在给定的燃烧过程设置中,这些主要措施在炉内的应用不会对燃料中灰的行为产生负面影响。
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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