Application of Furnace Safety Monitoring System in 2OOMW Unit

Abstract: The application information of furnace safety monitoring system in 2OOMW units is provided by excellent flowmeter and flowmeter manufacturers. The basic requirement of boiler combustion is to establish and maintain a stable combustion flame [1]. Due to improper operation, poor fuel quality, abnormal air supply and induction system, etc., the combustion in the furnace is unstable, and it is easy to cause fire. At this time, the fuel should be quickly removed to avoid the occurrence of boilers. You are welcome to inquire for more flowmeter manufacturers to select models and price quotations. The following is the application article details of furnace safety monitoring system in 2OOMW units. The basic requirement of boiler combustion is to establish and maintain a stable combustion flame [1]. Due to improper operation, poor fuel quality, abnormal air supply and induction system and other factors, the combustion in the furnace is unstable, and it is easy to cause fire extinguishing. At this time, the fuel should be quickly removed to avoid the vicious accident of boiler explosion. Furnace safety monitoring system (FSSS) is an organization that performs related protection functions, and is one of the most important protection devices for thermal power generating units. 1. Equipment overview and reasons for reconstruction Zhenhai Power Generation Co., Ltd. is equipped with 2 sets of 125MW fuel-fired units and 4 sets of 200MW coal-fired units. The four 2OOMW units are equipped with ultra-high pressure primary intermediate reheat, DG670/14n-8 natural circulation drum type boilers manufactured by Dongfang Boiler Factory. Since 1999, the company has completed the transformation of the distributed control system (DCS) of one unit every year. By 2003, the transformation of all four 2OOMW units had been completed. The reconstructed DCS adopts the distributed control system of Beijing Helixi Company—MACSM. Before the transformation, the FSSS of the unit adopts the MHB-2 fire detector of Acheng Relay Factory. It detects the screen and the logic screen in the control room. The fire detection screen processes the electrical signals obtained from the probes in the furnace, and then sends them. Enter the logic screen, the control logic is completed by the C200H programmable controller, the analog input/mode output board, and the digital input/output board in the logic screen, and finally various control commands are output by multiple intermediate relays. Due to the aging of equipment components, poor plug-in contact, and many failures of the frequency detection board, the reliability of the fire detection system for fire extinguishing protection is not high, and the flame signal is misfired or not issued many times, which affects the normal operation of the unit. Therefore, the company decided to retrofit the FSSS during the DCS retrofit of the unit and incorporate it into the DCS. In order to ensure the reliability of flame detection, the flame detection processor is changed to a multi-CPU intelligent flame detector of Harbin Zhongneng Automation Equipment, the model is ZHJZ-Vl. At the same time, in order to improve the automation level of the equipment and reduce the labor intensity of the operators, the system adds the ignition program control function. Cancel the logic screen, the logic controller adopts the same control equipment as the DCS (MACS system of Beijing Heli Shi Company), enters the DCS with the independent No. 22 I/O station, and is configured by the configuration software provided by the DCS to realize the FSSS. Control Strategy. 2. Description of the functions and configuration realized by FSSS 2.1 Furnace purge interlock In order to prevent the accumulation of combustible objects in the furnace, the boiler needs to be automatically purged before ignition is started or after the main fuel is tripped. The necessary conditions for purging are: (1) At least one blower is running; (2) At least one induced draft fan is running; (3) The powder feeder is completely stopped; (4) A and B powder dischargers are tripped; (5) The light oil shut-off valve is closed; (6) Furnace air volume > 30% full load air volume; (7) No flame signal in furnace detection (3/4 of each floor has no fire); (8) No boiler trip command; (9) Oil angle The valves are all closed; (10) The air pressure of the cooling fan is normal; (11) The leakage test of the oil system is completed or the leakage test is bypassed; (12) The secondary air door is fully opened. When all the above conditions are met, press the purge button to start purging. After 5 minutes of purging, the MFT lock will be automatically released, allowing ignition to start, otherwise all fuel will be blocked from entering the furnace. During the purging process, when any of the above purging conditions cannot be satisfied, the purging is interrupted immediately, and after it is re-satisfied, the purging is carried out for another 5 minutes until a successful purging is completed. 2.2 The flame monitoring of the whole furnace The flame detector collects the flame signal of each coal seam and each corner of the oil layer in the furnace, and converts it into a digital signal and enters the DCS22 I/O station. Through the DCS configuration, the following logic is realized: if there are 2 corners of the 4 corners of each layer, the layer is considered to have fire; if there are 3 corners of the 4 corners of each layer, it is considered that there is no fire in this layer; Only when the flame signal is confirmed by the corresponding powder feeder operation or corner oil gun operation signal of each layer can the layer and this corner be considered to be put into operation. 2.3 Main fuel trip (MFT) interlock When the main switch of fire protection protection is turned on, when any of the following conditions are met (and the sub-interlock switch is turned on), MFT will occur: (1) 3 furnace negative pressure measuring points The pressure measured by 2 measuring points is higher than 1471Pa; (2) The pressure measured by 2 measuring points of the 3 furnace negative pressure measuring points is lower than -1471Pa, and the furnace pressure low sub-interlock switch is turned on; (3) The whole furnace loses the flame, and it is confirmed by the operation signal of 2 or more powder feeders on any floor; (4) Both the induced fans A and B are tripped or completely stopped (delay 3s);

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