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Deposition of ash and its effect on heat transfer during the oxy-combustion of biomass and biomass-coal blends.

生物质和生物质-煤混合物富氧燃烧过程中灰分的沉积及其对传热的影响。

基本信息

批准号：
1603249
负责人：
Jost Wendt
金额：
$ 50万
依托单位：
University of Utah
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-07-01 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1603249&HistoricalAwards=false
关键词：
Deposition ash its effect heat

项目摘要

1603249 Wendt, Jost The overall objective of this project is to provide information that will enable implementation of oxy-combustion of biomass and biomass-coal blends for power generation. This technology, when followed by carbon sequestration, has the potential to have significant impact because it can simultaneously produce electricity and decrease CO2 emissions, using essentially conventional equipment. This process requires a knowledge of ash deposition and heat transfer under biomass oxy-combustion conditions, which are the twin thrusts of this research. The international team assembled consists of the Universities of Utah (UU) and North Dakota (UND) in the US and Huazhong University of Science and Technology (HUST), and Southeastern University (SEU) in China. Scientific objectives are to: 1) validate predictions of ash deposition rates during the oxy-combustion of biomass-coal blends; and 2) understand how these impact boiler chamber radiation. The hypothesis, based on limited preliminary experimental work, is that ash deposition rates are linearly dependent on the concentration of sub-micron particles (PM1) in the flue gas. In extending the work to oxy-biomass combustion, it is sought to understand formation of both the inner binding layer and bulk layer of controlled ash deposits, and to develop and apply experimental information to refine existing models for predicting the ash layer build up and submicron aerosol formation. These models will be employed in conjunction with high fidelity radiative property models in computational fluid dynamic simulations of the combustion scenarios. The simulations will be validated through coordinated experiments in both the US and China, at various scales, for various fuels, covering a range of combustion conditions, including experimental validation at both atmospheric and pressurized oxy-combustion conditions. This international collaborative project is expressly designed to provide the fundamental knowledge that will help bring this technology into practice, for both first generation (atmospheric pressure) and second generation (elevated pressure) oxy-combustion technologies. A US graduate student will assist in some of the experiments in China while Chinese students will participate in US activities.

1603249 Wendt, Jost 该项目的总体目标是提供信息，以实现生物质和生物质-煤炭混合物的富氧燃烧发电。这项技术加上碳封存后，有可能产生重大影响，因为它基本上可以使用传统设备，同时发电并减少二氧化碳排放。该过程需要了解生物质富氧燃烧条件下的灰烬沉积和传热，这是本研究的双重推动力。国际团队由美国犹他大学（UU）和北达科他大学（UND）以及中国华中科技大学（HUST）和东南大学（SEU）组成。科学目标是：1）验证生物质-煤混合物富氧燃烧过程中灰烬沉积率的预测； 2) 了解这些如何影响锅炉室辐射。基于有限的初步实验工作的假设是，灰烬沉积率与烟气中亚微米颗粒 (PM1) 的浓度线性相关。在将工作扩展到含氧生物质燃烧时，试图了解受控灰烬沉积物的内部粘合层和本体层的形成，并开发和应用实验信息来完善现有模型，以预测灰烬层的形成和亚微米气溶胶的形成。这些模型将与高保真辐射特性模型结合使用，用于燃烧场景的计算流体动力学模拟。这些模拟将通过在美国和中国进行的不同规模、不同燃料的协调实验进行验证，涵盖一系列燃烧条件，包括在大气和加压富氧燃烧条件下的实验验证。该国际合作项目的明确目的是提供基础知识，帮助将第一代（常压）和第二代（高压）富氧燃烧技术的技术付诸实践。一名美国研究生将协助中国的一些实验，而中国学生将参加美国的活动。