Low NOx hybrid combustion system and method for preheating semi-coke by high-temperature flue gas of power station boiler

• Main Authors: WANG PENGQIAN, ZHANG JINPING, WANG CHANG'AN, WU SONG, ZHAO LEI, CHE DEFU
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2018
• Subjects: AIR; BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; FEEDING FUEL TO COMBUSTION APPARATUS; FLUES; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES; SEPARATION; TRANSPORTING; WEAPONS

The invention relates to a low NOx hybrid combustion system and method for preheating semi-coke by high-temperature flue gas of a power station boiler. According to the hybrid combustion system and method, a preheating pipeline and a cyclone preheating separator are adopted, the semi-coke is directly preheated through the high-temperature flue gas, so that the temperature of the semi-coke sprayedinto a hearth is remarkably improved; meanwhile, a stable ignition region for combustion of bituminous coal is arranged at the lower part of the hearth, so that ignition and flame stabilization of combustion of ultra-low volatile semi-coke fuel are facilitated, and the large proportion (larger than or equal to 45%) blending combustion of the semi-coke fuel of the power station boiler is achieved;a preheating product with the relatively strong reducibility is produced while the semi-coke is preheated, the preheating product is directly sprayed into the middle part of the hearth through a combustor, a NOx reduction zone