Method for decreasing occurrence rate of transverse cracks of boiler water walls

• Main Authors: QI YONGFENG, CHEN JIE, MENG DIANWU, LIU WEI, WANG QI, SHANG ZHIJIN, LIU JINFENG, SUN JIE, LIU QINGSONG, SHI YIWEN
• Format: Patent
• Language: Chinese; English
• Published: 22.02.2017
• Subjects: 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; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODS OF STEAM GENERATION; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTIONAPPARATUS; STEAM BOILERS; STEAM GENERATION; WEAPONS

The invention relates to a method for decreasing the occurrence rate of transverse cracks of boiler water walls. The method comprises the following steps, from wall temperature monitoring to hole expanding, that when a boiler and the water walls operate, the temperatures of the water walls on the four sides and water wall pipes are monitored correspondingly; a thermal deviation curve showing temperature distribution of the water wall pipes in the water walls on the four sides is drawn according to measured temperature data, and whether water wall pipes located in an overheat area exist or not is judged; and throttling holes corresponding to the water wall pipes located in the overheat area are expanded, wherein after hole expanding is conducted during one time of operation, wall temperature monitoring and overheat judging are conducted in the next time of operation, and throttling holes corresponding to the water wall pipes located in the overheat area are expanded after the water wall pipes located in the ov