Numerical simulation of molten-slag flow in coal gasifier

Maromu Otaka, Hiroaki Watanabe, Saburo Hara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.

Original languageEnglish
Title of host publicationProceedings of the ASME Power Conference, 2005
Subtitle of host publicationIncludes Papers from the 2005 International Conference on Power Engineering, ICOPE
Pages1471-1476
Number of pages6
Publication statusPublished - Nov 21 2005
Externally publishedYes
Event2005 ASME Power Conference - Chicago, IL, United States
Duration: Apr 5 2005Apr 7 2005

Publication series

NameProceedings of the ASME Power Conference, 2005
VolumePART B

Other

Other2005 ASME Power Conference
CountryUnited States
CityChicago, IL
Period4/5/054/7/05

Fingerprint

Slags
Molten materials
Coal
Computer simulation
Discharge (fluid mechanics)
Ashes
Gasification
Fluidity
Gases
Temperature
Solidification
Heat transfer
Fluids
Air

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Otaka, M., Watanabe, H., & Hara, S. (2005). Numerical simulation of molten-slag flow in coal gasifier. In Proceedings of the ASME Power Conference, 2005: Includes Papers from the 2005 International Conference on Power Engineering, ICOPE (pp. 1471-1476). [PWR2005-50370] (Proceedings of the ASME Power Conference, 2005; Vol. PART B).

Numerical simulation of molten-slag flow in coal gasifier. / Otaka, Maromu; Watanabe, Hiroaki; Hara, Saburo.

Proceedings of the ASME Power Conference, 2005: Includes Papers from the 2005 International Conference on Power Engineering, ICOPE. 2005. p. 1471-1476 PWR2005-50370 (Proceedings of the ASME Power Conference, 2005; Vol. PART B).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Otaka, M, Watanabe, H & Hara, S 2005, Numerical simulation of molten-slag flow in coal gasifier. in Proceedings of the ASME Power Conference, 2005: Includes Papers from the 2005 International Conference on Power Engineering, ICOPE., PWR2005-50370, Proceedings of the ASME Power Conference, 2005, vol. PART B, pp. 1471-1476, 2005 ASME Power Conference, Chicago, IL, United States, 4/5/05.
Otaka M, Watanabe H, Hara S. Numerical simulation of molten-slag flow in coal gasifier. In Proceedings of the ASME Power Conference, 2005: Includes Papers from the 2005 International Conference on Power Engineering, ICOPE. 2005. p. 1471-1476. PWR2005-50370. (Proceedings of the ASME Power Conference, 2005).
Otaka, Maromu ; Watanabe, Hiroaki ; Hara, Saburo. / Numerical simulation of molten-slag flow in coal gasifier. Proceedings of the ASME Power Conference, 2005: Includes Papers from the 2005 International Conference on Power Engineering, ICOPE. 2005. pp. 1471-1476 (Proceedings of the ASME Power Conference, 2005).
@inproceedings{dc8b6c63d3f8486183bcf4fbb6494a51,
title = "Numerical simulation of molten-slag flow in coal gasifier",
abstract = "In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.",
author = "Maromu Otaka and Hiroaki Watanabe and Saburo Hara",
year = "2005",
month = "11",
day = "21",
language = "English",
isbn = "0791841820",
series = "Proceedings of the ASME Power Conference, 2005",
pages = "1471--1476",
booktitle = "Proceedings of the ASME Power Conference, 2005",

}

TY - GEN

T1 - Numerical simulation of molten-slag flow in coal gasifier

AU - Otaka, Maromu

AU - Watanabe, Hiroaki

AU - Hara, Saburo

PY - 2005/11/21

Y1 - 2005/11/21

N2 - In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.

AB - In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.

UR - http://www.scopus.com/inward/record.url?scp=27744546064&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=27744546064&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:27744546064

SN - 0791841820

SN - 9780791841822

T3 - Proceedings of the ASME Power Conference, 2005

SP - 1471

EP - 1476

BT - Proceedings of the ASME Power Conference, 2005

ER -