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

• 批准号: 11218201
• 负责人: TOMITA Akira
• 金额: $ 20.22万
• 依托单位: Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11218201/
• 关键词: Mineral Matter; Trace Element; Desulfurization; 石炭; 微量元素

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.

为了抑制煤炭燃烧期间的发射异源。从项目中获得了痕量元素发射的方法。加载钙超声辐射时，具有石灰岩的煤炭。 3）通过综合浸出实验获得了有关痕量元素模式的几种见解。元素。我们发现PB的CR高达1100°C，取决于加热速率。捕获对IS VolpoRation行为的理解。

项目成果

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。

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。

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）。

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。

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。