THERMAL BEHAVIOR OF FOREST BIOMASS WASTES PRODUCED DURING COMBUSTION IN A BOILER SYSTEM

ABSTRACT It is known that during the biomass combustion in industrial systems the formation of residues containing ashes and residual carbon occurs. The content of the residues varies according to the efficiency and operating parameters of the combustion chambers. The characterization of these residues is an essential tool to identify their potential for energy reuse. The aim of this paper was to analyze the thermal behavior of the biomass and the residues yielded during the combustion process in a boiler system. For this purpose, forest biomass and ash samples have been analyzed in a laboratory and at four collection points of generation and treatment of the combustion residues (readler, hopper, scrubber, and decanter) inside the boiler of a power plant. The thermogravimetric analysis (TGA and DTA) have been carried out on all samples. Moreover, the ultimate analysis, the proximate analysis and the gross calorific value of all samples have been determined. Results show that the biomass burning efficiency in the boiler furnace was high, which was proven by the chemical composition and thermal degradation behavior of the residues collected in the readler. The scrubber’s light wastes presented chemical and energy properties (7180 kcal/kg, 75% fixed carbon content, 21% volatile content and 3.72% ash content), and thermal behavior similar to the ones found in the literature for eucalyptus charcoal. However, in order to reuse these combustion residues on reinjection or reheat systems, machine adjustments are essential to achieve burning efficiency and avoid operational problems. The decanter wastes did not show potential for energy reuse.

摘要：众所周知，工业系统中的生物质燃烧过程会产生含有灰分与残余碳的残渣。残渣的含量随燃烧室的运行效率与操作参数而异。对这类残渣进行表征是明确其能源回用潜力的必要手段。本文旨在分析生物质以及锅炉系统燃烧过程中产生的残渣的热行为。为此，研究人员在某电厂锅炉内的四个燃烧残渣生成与处理点位——刮板式输渣机（readler）、料斗（hopper）、洗涤塔（scrubber）与倾析器（decanter）——采集了样品，并与森林生物质样品一同开展实验室分析。对所有样品进行了热重分析（thermogravimetric analysis，TGA）与差热分析（differential thermal analysis，DTA），同时测定了所有样品的元素分析、工业分析以及总热值。结果表明，锅炉炉膛内的生物质燃烧效率较高，这一点可通过刮板式输渣机采集的残渣的化学成分与热降解行为得到验证。洗涤塔产生的轻质残渣具备化学与能源特性（7180千卡/千克，固定碳含量75%，挥发分含量21%，灰分含量3.72%），其热行为与文献中记载的桉木炭相似。但若要将这类燃烧残渣回注或再加热系统中回用，需对设备进行调整，以保障燃烧效率并避免运行故障。倾析器产生的残渣则不具备能源回用潜力。

搜集汇总

背景与挑战

背景概述

该数据集研究了森林生物质废弃物在锅炉系统燃烧过程中的热行为，包括热重分析和化学组成测定。研究发现部分废弃物具有类似桉木炭的能源特性，但需调整设备以实现高效再利用。