Removal of mineral matter and trace elements by chemical coal cleaning, and use of the reaction product as desulfurization agent

化学洗煤去除矿物质和微量元素,反应产物作为脱硫剂

基本信息

项目摘要

To suppress emission of toxic heteroatoms during coal combustion, it is important to understand the mode of occurrence and behavior of heteroatoms during combustion. In this project, we aim to propose the methods to suppress the emission of sulfur oxide and toxic trace elements. Detailed objectives of this project are as follow : 1) desulfurization by loading calcium with simple methods, 2) chemical cleaning using lime for removal of trace elements as well as mineral matter, And 3) development of method for suppression of trace elements emission. The following results were obtained from this project.1) SOx emission during combustion was effectively suppressed by loading hydrated calcium on coal. The level of SOx emission was much lower when compared with the combustion of the physical mixture of coal with limestone. Furthermore, desulfurization yield was increased when loading calcium under ultrasonic irradiation.2) Removal yields of trace elements such as B, F, Cd, and As by chemical coal cleaning with lime were attained to about 70%. The yield was not so high in comparison with that of mineral matter, indicating the presence of organically associated trace elements.3) Several insights on the mode of occurrence of trace elements were obtained by the comprehensive leaching experiments. We proposed a novel method, leaching of coal char as well as raw coal with HNO_3 and HCl, to elucidate the mode of occurrence of trace elements. We found that Pb, Cr and As were volatilized by heating up to 1100℃ and the volatilization behavior strongly depended on the heating rate. The heating rate dependency on the volatilization was related to the presence of unburnt carbon at high temperature region. Finally, we proposed a method for capture of As through the understanding of its volatilization behavior.
为了抑制煤燃烧过程中有毒杂原子的排放,重要的是要了解杂原子在燃烧过程中的存在方式和行为。在本项目中,我们的目标是提出抑制硫氧化物和有毒微量元素排放的方法。本项目的具体目标是:1)用简单的方法负载钙进行脱硫,2)用石灰进行化学清洗以去除微量元素和矿物质,3)开发抑制微量元素排放的方法。研究结果表明:1)在煤中负载水合钙能有效地抑制燃烧过程中SOx的排放。与煤与石灰石的物理混合物的燃烧相比,SOx的排放水平低得多。2)石灰化学净化煤对B、F、Cd、As等微量元素的去除率可达70%左右。结果表明,微量元素的溶出率低于矿物质溶出率,表明存在有机伴生的微量元素。3)通过综合淋滤实验,对微量元素的赋存状态有了一些认识。本文提出了一种新的方法,即用HNO_3和HCl浸取煤焦和原煤,以阐明微量元素的赋存状态。结果表明,Pb、Cr和As在1100℃时挥发,且挥发行为强烈依赖于升温速率。升温速率对挥发的依赖性与高温区未燃碳的存在有关。最后,我们提出了一种方法来捕获的As通过其挥发行为的理解。

项目成果

期刊论文数量(30)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hao-Jie Fan, Koichi Matsuoka, Jie Wang, Akira Tomita: "Ultrasonic Loading of Calcium on Coal for Enhanced SO_2 Capture"Fuel. 82(5). 481-486 (2003)
范浩杰、松冈浩一、王杰、富田晃:“在煤上超声加载钙以增强 SO_2 捕获”燃料。
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Haojie Fan, Koichi Matsuoka, Jie Wang, and Akira Tomita: "Ultrasonic Loading of Calcium on Coal for Enhanced SO_2 Capture"Fuel. 82(5). 481-486 (2003)
Haojie Fan、Koichi Matsuoka、Jie Wang 和 Akira Tomita:“在煤上超声加载钙以增强 SO_2 捕获”燃料。
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Jie Wang, Akira Takaya, Akira Tomita: "Leaching of Ashes and Chars for Examining Transformations of Trace Elements during Coal Combustion and Pyrolysis"Fuel誌(本特定研究の成果特集号)に投稿中.
Jie Wang、Akira Takaya、Akira Tomita:“通过灰烬和炭的浸出来检查煤炭燃烧和热解过程中微量元素的变化”,提交给《Fuel》杂志(关于这项具体研究结果的特刊)。
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Koichi Matsuoka, Aki Abe, aAkira Tomita: "Suppression of SO_2 Emission during Coal Oxidation with Calcium Loaded by Hydrothermal or Hydration Treatment"Energy Fuels. 15(3). 648-652 (2001)
Koichi Matsuoka、Aki Abe、Akira Tomita:“通过水热或水合处理负载钙来抑制煤氧化过程中的 SO_2 排放”能源燃料。
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Koichi Matsuoka, Aki Abe, Yohsuke Suzuki, Akira Tomita: "Effectiveness of Hydrothermal Treatment of Coal with Lime for Removal of Trace Elements"Energy Fuels. 16(4). 920-924 (2002)
Koichi Matsuoka、Aki Abe、Yohsuke Suzuki、Akira Tomita:“石灰水热处理煤去除微量元素的效果”能源燃料。
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TOMITA Akira其他文献

TOMITA Akira的其他文献

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{{ truncateString('TOMITA Akira', 18)}}的其他基金

Study on the NO_x formation and decomposition mechanism at high temperatures
高温下NO_x生成与分解机理研究
  • 批准号:
    13450332
  • 财政年份:
    2001
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
A study on thermally and chemically stable multifunctional membranes
热化学稳定性多功能膜的研究
  • 批准号:
    10305060
  • 财政年份:
    1998
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A).
Study on the Mechanism of Carbon/NO_x Reaction by Using Isotopes
同位素研究碳/NO_x反应机理
  • 批准号:
    08455369
  • 财政年份:
    1996
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Possibility of new endstopic pbotodynamic therapy with ultrasound.
超声新的终点光动力疗法的可能性。
  • 批准号:
    07670636
  • 财政年份:
    1995
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A solution of pollution and energy problems by using catalytic gasification reaction of carbon
利用碳催化气化反应解决污染和能源问题
  • 批准号:
    03045013
  • 财政年份:
    1991
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
Utilization of Two-Dimensional Carbon Prepared in the Interlamellar Spacing of Clay Mineral
粘土矿物层间制备二维碳的利用
  • 批准号:
    01490004
  • 财政年份:
    1989
  • 资助金额:
    $ 20.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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