Blending combustion method applied to blending combustion of low-ash-fusion-point high-sulfur lignite in pulverized coal fired boiler fuel

• Main Authors: PANG KAIYU, YANG SHAOCAI, GE CHENGYONG, DONG WU, XIN LIANG, WANG MINGYANG, HAO WENYE, YAO ZHENGANG, WANG YONG, GONG YINGJIE, LI HONGYAN, FU TENG, ZHOU XINGYE, SUN XIN, LIANG CHEN, PU JIANYE, WANG ZHI, XU MOBEI
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• Subjects: AIR; AIR SUPPLY; BLASTING; CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FORCOMBUSTION CHAMBERS, e.g. FIREBRIDGES; COMBUSTION APPARATUS; COMBUSTION PROCESSES; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDEDFOR; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS INCOMBUSTION CHAMBERS; DRAUGHT-INDUCING; FEEDING FUEL TO COMBUSTION APPARATUS; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTIONAPPARATUS; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS; WEAPONS

The invention discloses a blending combustion method applied to blending combustion of low-ash-fusion-point high-sulfur lignite in pulverized coal fired boiler fuel. The blending combustion method comprises the following steps: step one, transforming an original boiler, additionally arranging a steam-primary air heater in a primary air channel between an air preheater and a coal mill of the original boiler, producing steam of the steam-primary air heater from tertiary extraction of a steam turbine, and heating primary air at an outlet of the air preheater through the steam-primary air heater; and step two, conveying the coal for normal combustion and the low-melting-point high-sulfur lignite to different coal mills correspondingly and milling the coal into pulverized coal in the different coal mills, then conveying the pulverized coal to different combustors of the pulverized coal boiler to be combusted, namely, conveying the pulverized coal of the low-ash-fusion-point high-sulfur lignite to a lower-layer com