Chunkwood fuel feeding and combustion experiments in small-scale boilers to provide design suggestions for chunkwood friendly boiler construction

IF 7.1 2区工程技术 Q1 ENERGY & FUELS

Sustainable Energy Technologies and Assessments Pub Date : 2024-09-21 DOI:10.1016/j.seta.2024.103986

Tomas Persson , Marie Rönnbäck , Jan Erik Mattsson , Bengt-Olof Danielsson , Daniel Ryde

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引用次数: 0

Abstract

Chunkwood fuels have a particle size larger than normal chips which enables good drying and storage properties and are therefore appreciated by small-scale users. However, small-scale boilers optimized for chunkwood are not commercially available and the research question is if modern wood chip stokers, selected for having a robust fuel feeding system could feed and combust the fuel. Chunkwood fuel feeding, and combustion tests are performed in a 27-kW and a 240-kW wood chip stoker. Both boilers fulfill Ecodesign emission requirements for carbon monoxide (CO) at nominal load, but further optimization is required to fulfil requirements for dust. Partial load combustion needs to be further studied. There were problems with high stress on the fuel feeding system in both stokers, traced to when excessively large fuel pieces passed the outlet of the fuel bin and when fuel discs became trapped between the auger screw and the lid of the conveyor. Suggestions to solve the fuel feeding problems includes redesign of the fuel bin auger screw to cut oversized pieces, alternatively use of previously developed prototype conveyors that worked. Further studies are required to optimize the fuel feeding system and the combustion performance including a solution for partial load operation.

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在小型锅炉中进行春木燃料给料和燃烧实验，为春木友好型锅炉的建造提供设计建议

矮木柴燃料的颗粒尺寸比普通木片大，具有良好的干燥和储存特性，因此受到小型用户的青睐。然而，针对矮木柴进行优化的小型锅炉在市场上并不多见，因此研究的问题是，因具有强大的燃料给料系统而被选中的现代木屑炉能否给料和燃烧这种燃料。我们在一台 27 千瓦和一台 240 千瓦的木屑燃烧炉中进行了松香木燃料给料和燃烧测试。在额定负荷下，两台锅炉都能满足生态设计对一氧化碳（CO）的排放要求，但需要进一步优化以满足对粉尘的要求。部分负荷燃烧需要进一步研究。两台燃烧炉的燃料进料系统都存在应力过大的问题，原因是过大的燃料块通过燃料仓出口，以及燃料盘被卡在螺旋钻和输送机盖之间。解决燃料供给问题的建议包括重新设计燃料仓螺旋钻，以切割过大的燃料块，或者使用以前开发的原型输送机。还需要进一步研究，以优化燃料供给系统和燃烧性能，包括部分负荷运行的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainable Energy Technologies and Assessments Energy-Renewable Energy, Sustainability and the Environment

CiteScore

12.70

自引率

12.50%

发文量

1091

期刊介绍： Encouraging a transition to a sustainable energy future is imperative for our world. Technologies that enable this shift in various sectors like transportation, heating, and power systems are of utmost importance. Sustainable Energy Technologies and Assessments welcomes papers focusing on a range of aspects and levels of technological advancements in energy generation and utilization. The aim is to reduce the negative environmental impact associated with energy production and consumption, spanning from laboratory experiments to real-world applications in the commercial sector.