W-flame boiler adopting recycled flue gas

• Main Authors: ZHANG XIAOYAN, ZENG LINGYAN, GAO LUSHAN, WANG QINGXIANG, CHEN ZHICHAO, LI ZHENGQI
• Format: Patent
• Language: Chinese; English
• Published: 19.01.2018
• Subjects: AIR; BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; WEAPONS

The invention relates to a W-flame boiler, in particular to a W-flame boiler adopting recycled flue gas and belongs to the technical field of energy conservation and emission reduction of the W-flameboiler. The problem that after over fire air is added for a W-flame boiler adopting a swirl pulverized coal burner, the content of combustibles in fly ash is greatly increased is solved. Each spandrelgap type recycled flue gas nozzle corresponds to one swirl pulverized coal burner on the same side; a spandrel recycled flue gas air bellow is located at the spandrel gap type recycled flue gas nozzles; an outlet of an induced draft fan communicates with a recycled flue gas header pipe; one end of each spandrel recycled flue gas air bellow branch pipe communicates with a corresponding staging airrecycled flue gas branch pipe; the other end of each spandrel recycled flue gas air bellow branch pipe communicates with the spandrel recycled flue gas air bellow; the other ends of outer secondary air recycled flue gas branch