CWM production from upgraded young low rank coals
- JGC Corp., Tokyo (Japan)
- Japan COM Co., Tokyo (Japan)
- Center for Coal Utilization (Japan)
CWM is a mixture of pulverized coal (60 to 70%) and water (30 to 40%) with a very small quantity of dispersant. It is stable under storage conditions and is sufficiently fluid to be transported by means of long-distance pipelines, and ocean going tankers. In order to overcome the economic difficulties of CWM, the authors started the development of a new type of CWM based on abundant non-utilized young low grade coal. This R and D aims at developing and demonstrating an economical clean coal fuel manufacturing technology to ensure safe transportation and storage. To this end, it is necessary to develop a technology to irreversibly dewater coals while maintaining volatility as far as possible, and to convert dewatered coals to high-concentration coal water mixtures (CWM). Japan COM Company Limited and JGC Corporation have been jointly conducting research and development of low rank coals upgrading technology to establish CWM production and utilization technologies from upgraded coals at lower cost and higher quality. In the first phase, the authors investigated available low rank coals upgrading technologies and selected the hot water drying (HWD) process as suited for the conversion of coals to CWM. In the second phase, they conducted HWD upgrading tests using an autoclave and a continuous type bench plant for laboratory-scale tests to convert upgraded coals to CWM, and thus confirmed upgrading effects. In the third phase, they constructed an upgrading pilot plant of 8.4 t/d (dry coal) processing capacity and have conducted upgrading tests. They have also conducted CWM production tests using a CWM production facility of 500 kg/h, and assessed the combustibility of upgraded coal CWM. The operation is carried out using three coals, two Indonesian sub-bituminous coals and one Australian brown coal, which were selected through the bench-scale testing. The following tests were carried out from Dec. of 1994 to March 1996: (1) Continuous upgrading tests by newly constructed 350kg/h pilot plant; (2) Continuous CWM production tests by an existing 500 kg/h pilot plant; (3) Upgraded CWM combustion tests by 200 kg/h furnace; (4) Upgraded CWM combustion tests by 2,500 kg/h furnace; and (5) Upgraded CWM gasification tests by 6.0 t/d Texaco gasifier. Results are presented.
- OSTI ID:
- 324608
- Report Number(s):
- CONF-970931--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development for production technology of CWM from low-rank coals
Research and development of CWM technology toward clean coal use