BOILER SYSTEM AND POWER PLANT INCLUDING THE SAME

摘要

A boiler system is provided including: a boiler that burns fuel containing sulfur content, chlorine content, and water content to generate a combustion gas; a bagfilter that removes sulfur oxide; a denitration section that removes nitrogen oxide; a desulfurizing absorbent supply section that mixes a desulfurizing absorbent into the combustion gas on an upstream side of the bagfilter; and a reformer that mixes a denitrating reagent into the combustion gas on an upstream side of the denitration section, wherein the bagfilter performs dry desulfurization, and a temperature of the combustion gas passing through the bagfilter and flowing into the denitration section is higher than 200° C. and 350° C. or lower, and the combustion gas from which the sulfur oxide has been removed by the bagfilter flows into the denitration section without being heated on the upstream side of the denitration section.

主权项

1. A boiler system comprising:
a boiler that burns fuel containing sulfur content at a weight percent concentration of lower than 8.0%, chlorine content at a weight percent concentration of lower than 0.1%, and water content at a weight percent concentration of lower than 20.0% to generate a combustion gas; a removal section that is arranged on a downstream side of the boiler and that removes sulfur oxide contained in the combustion gas and removes smoke dust contained in the combustion gas; a denitration section that is arranged on a downstream side of the removal section and that removes nitrogen oxide contained in the combustion gas from which the sulfur oxide has been removed by the removal section; a desulfurizing absorbent supply section that mixes a desulfurizing absorbent for removing sulfur oxide contained in the combustion gas into the combustion gas on an upstream side of the removal section; and a denitrating reagent supply section that mixes a denitrating reagent for removing nitrogen oxide contained in the combustion gas into the combustion gas on an upstream side of the denitration section, wherein the removal section performs dry desulfurization, and a temperature of the combustion gas flowing into the removal section is higher than 200° C. and 350° C. or lower, and the combustion gas from which the sulfur oxide has been removed by the removal section flows into the denitration section without being heated on the upstream side of the denitration section.