Control method for overcoming feed water flow fluctuation through flexible peak regulation of coal-fired unit

• Main Authors: ZHU BIN, HAO XIN, ZHANG LIANXU, HU SHAOYU, YAO YUAN, LI JIANJUN, REN YI, ZHANG QIANG, FAN TINGJU, LI GEN, XU JING, YU XUELI, ZHANG GUOZHI, DENG HAITAO, LIU MINGSHENG, JI JUNWEI, FAN YUZI
• Format: Patent
• Language: Chinese; English
• Published: 18.04.2023
• Subjects: AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHINBOILERS; BLASTING; CONTROLLING WATER LEVEL; FEED-WATER SUPPLY; HEATING; LIGHTING; MECHANICAL ENGINEERING; PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; STEAM GENERATION; WEAPONS

The invention belongs to the technical field of automatic control of thermal generator sets, and particularly relates to a control method for overcoming water supply flow fluctuation through flexible peak regulation of a coal-fired unit. Comprising the steps that in the flexible peak regulation process of the coal-fired unit, DCS control logic progressively adjusts the gain value and the integral time of a feed water flow PID regulator according to a steam flow operation interval value and a feed water flow control deviation change rate; a water feeding pump operation state monitoring module is added, water feeding flow fluctuation caused by tripping of one of the two operation water feeding pumps is judged, a recirculation valve of the operation water feeding pump is closed in a linkage mode, and meanwhile output of the operation water feeding pump is increased in an override mode; a coal economizer water supply bypass state monitoring module and a coal economizer water supply bypass adjusting valve rate lim