Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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714 Molecular Dynamics Simulation on Desulfurization Characteristics in Coal Combustion

MURAKAMI Takahiro, KURITA Noriyuki, NARUSE Ichiro

The Proceedings of Conference of Kansai Branch Vol. 2001 ( 0 ) page： _7 - 27_-_7-28_ 2001

Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

Limestone has been currently used as a desulfuriser to capture SOx emitted from fluidized bed coal combustors. The limestone mainly consists of CaCO_3, which is also contained in seashells. Considering this similarity, desulfurization characteristics of the seashells and limestone were compared in our previous study. From the results obtained, the desulfurization efficiency of seashell was over twice higher than that of limestone. The reason of high desulfurization efficiency of seashell is caused by high alkali content in the seashells. In the present study, molecular dynamics (MD) simulations will be useful to study that relationship theoretically. Therefore, we adopted MD simulations relating to CaO structure. In the simulation, two cases of CaO alone and CaO-NaCl or KCl systems were analyzed in order to elucidate change of the molecular structure for CaO due to the alkali addition.

DOI： 10.1299/jsmekansai.2001.76._7-27_

48. Evolution Behavior of Fine Particulates Containing Alkali Metal Compounds in Coal Combustion

TAKUWA Tsuyoshi, MURAKAMI Takahiro, NARUSE Ichiro

Proceedings of Conference on Coal Science Vol. 38 ( 0 ) page： 199 - 202 2001

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In coal-fired combined power generation systems like pressurized fluidized bed combustion (PFBC), vapor-phase alkali metal compounds from coal contaminate the reaction gas, which may cause hot corrosion of turbine blades. In this study, evolution behaviors of the alkali metal compounds, especially for sodium compounds, in coal combustion were elucidated, sampling and shifting the fine particulates in the combustion process and analyzing the sodium concentration. Concentration of fine particulates and distribution of sodium concentration in the particulates depended on coal type. The mechanism of sodium enrichment was estimated by the result of sodium concentration in the particulates shifted.

DOI： 10.20550/jiesekitanronbun.38.0_199

47. Elucidation of ash deposition mechanisms by analysis of ash particles in reacting coal particles

KAMIHASHIRA Daisuke, KHAIRIL, NARUSE Ichiro, YAMASHITA Toru, TOMINAGA Hiroaki

Proceedings of Conference on Coal Science Vol. 38 ( 0 ) page： 195 - 198 2001

Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

Precise and quantitative behaviors on ash deposition phenomena in high-temperature coal gasification were studied, using a horizontal pulverized coal gasifier with a pre-combustor. The deposition experiment was carried out by inserting a water-cooled tube into the gasifier. The deposition phenomena were quantitatively and visually discussed by analyzing ash particles in the raw coal, the reacting particles and the deposition layer by means of CCSEM. As a result, particle diameter and chemical composition of ash particles rapidly change in the initial stage. The included mineral particles tend to agglomerate inside a coal particle during volatile matter combustion.

DOI： 10.20550/jiesekitanronbun.38.0_195

K-2223 Combustion and De-chlorination Characteristics of Refuse Derived Fuels

HIGUCHI Atsushi, YANAGINO Hideo, NARUSE Ichiro

The proceedings of the JSME annual meeting Vol. 1 ( 0 ) page： 583 - 584 2001

Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

Fundamentals on de-chlorination characteristics with Refuse Derived Fuels (RDF), which had been developed to utilize as source for thermal energy, were studied by using both the practical RDF and the simulated RDF. For the simulated RDF polyvinyl chloride (PVC) or NaCl was added as a chlorine source. In the experiment single pellet of RDF was burned in an electrically heated batch furnace. The de-chlorination efficiency was calculated by means of analysis of Cl in the residue after combustion. The efficiency obtained was compared with that obtained by chemical equilibrium calculation. As a result, HCl is almost emitted during the volatile matter combustion. The de-chlorination characteristics for PVC addition differ from that for NaCl addition. For the RDF adding the de-chlorination reaction depends on the furnace temperature, and the optimum temperature is about 923 K. The phenomena are caused by the following reasons. At low temperature the de-chlorination rate is slower than the evolution rate of HCl gas. At high temperature, on the other hand, CaCl_2, which is produced by the de-chlorination reaction, is decomposed during the char combustion. For the NaCl addition, Ca compound does not absorb Cl in NaCl. According to chemical equilibrium calculation, NaCl is evaporated as a form of NaCl and Na_2Cl_2 vapors. HCl is not produced either.

DOI： 10.1299/jsmemecjo.II.01.1.0_583

K-2233 Co-combustion Characteristics of Coal with Biomass

Morishita Keiju, Naruse Ichiro

The proceedings of the JSME annual meeting Vol. 1 ( 0 ) page： 603 - 604 2001

Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

In order to utilize low-grade coals efficiently and cleanly, co-combustion of coal with biomass was proposed since the biomass had the function to enhance the overall reaction characteristics. In this study, co-combustion of coal with biomass was tested by an electrically heated drop tube furnace to elucidate effect of the biomass on the combustion characteristics of coal. As a result, the biomass can enhance ignition of the low-grade coal during the co-combustion. Formation of NO under the co-combustion condition tended to relatively increase.

DOI： 10.1299/jsmemecjo.II.01.1.0_603

Experimental Study on Combustion and Pollutant Control of Biobriquette

Lu G.

Energy and Fuels Vol. 14 ( 6 ) page： 1133 - 1138 2000.11