A method and system for automatic parallel connection of primary fans for thermal power generating units

Abstract

The invention discloses a primary draught fan automatic parallel method and system for a thermal generator set. The method comprises the following steps that whether a draught fan needs to be automatically in parallel is judged according to the running information of a primary draught fan of the set, when the primary draught fan is required to be automatically in parallel, an air door baffle interlocking logic of a primary air system is forced to be parallel, a load of a boiler and the primary air pressure are adjusted, and the automatic parallel condition of the draught fan is met; a target value of the opening degree of a movable blade of the primary draught fan which needs to be in parallel is calculated and input, and a target value of the opening degree of a movable blade of a runningdraught fan; after the draught fan is parallel, the draught fan current deviation value is calculated, and the draught fan is judged to be successful to be parallel. According to the method, manual operation of the draught fan parallel process can be reduced, the flow of the draught fan parallel process is solidified, and the main protection tripping risk of the boiler caused by the draught fan stopping, surge and wind pressure large fluctuation in the draught fan parallel process is avoided.

Description

technical field [0001] The invention relates to a coal-fired power plant primary fan paralleling technology for a thermal power generating set, in particular to an automatic paralleling method and system for a primary fan of a thermal generating set. Background technique [0002] As the single unit capacity of coal-fired power plant boilers gradually increases, the capacity of the matching blower, primary fan, and combined fan also increases. In order to ensure the long-term stable operation of the unit, the boiler has higher and higher requirements on the reliability of the fans. However, for the fans of rotating machinery, failures will inevitably occur during the entire service period, causing the fan RB and the unilateral fan to stop running. . In order to minimize the safety risk and power loss during the parallel operation of the fans after the RB action, the operating personnel are required to be able to safely and quickly merge the fans. During the parallel operati...

AI Technical Summary

Problems solved by technology

The air volume and air pressure at the outlet of the primary fan directly affect the total fuel volume of the boiler. During the parallel operation of the primary fan, large fluctuations in the primary air pressure are likely to occur, causing violent fluctuations in the amount of fuel entering the furnace, which will deteriorate the combustion stability of the boiler and even cause fire detection. Serious accidents such as complete furnace fire extinguishing occurred

In addition, when the primary fans are operated in parallel, it is easy for two primary fans to grab the wind repeatedly. Only one side of the fan is loaded, and the other fan is always in a stall state without output power, resulting in continuous large fluctuations in the primary wind pressure and continuous occurrence of primary wind pressure. Too low, causing the boiler parameters to be out of adjustment and forced to stop

Images