Conventional Pulverized Coal and Fluidized Bed Combustion Testing of San Miguel Lignite

摘要

The information generated at GFETC can be summarized in the following way: (1) The ash fouling furnace is an empirical tool which provides good information on relative fouling potential of various fuels. In the case of San Miguel lignite, tests suggest a severe fouling problem if conventional boiler designs are employed. (2) No effect in either deposition rate or deposit strength was seen when MgO and CaCO sub 3 were used as additives. For these tests a single addition rate was utilized at two different injection points in the system. (3) Deposits from the combustion of San Miguel lignite are very different from those observed when burning a Northern Great Plains lignite, primarily because of the building of deposits from the refractory wall. (4) No bed agglomeration was noted under the varied run conditions used in AFBC testing of this lignite fuel. (5) The AFBC NO/sub chi/ level emitted in the flue gas were always less than the NSPS limit of 0.6 lbs NO sub 2 /10 exp 6 Btu. (6) Utilization of inherent alkali was less than that observed for North Dakota lignites. It was possible to meet NSPS standards of 90% sulfur capture using limestone addition. Use of lower grade fuels such as the lignite from the San Miguel mine is inevitable if we are to meet the expanding needs for energy in the United States today. To make use of these different fuels extensive testing on laboratory and pilot scales will be beneficial in avoiding major problems due to the different characteristics these materials possess. The present successful operation of a full scale boiler using the San Miguel lignite is a good example of the value pilot scale studies can have on the road to successful operation. (ERA citation 09:005729)