US 12,305,540 B1
Frequency modulation auxiliary method and device for thermal power plant based on dual electric energy converter
Yantao Liu, Yantai (CN); Chunxiao Li, Yantai (CN); Likun Zheng, Yantai (CN); Jun Hao, Yantai (CN); Lianmin Ma, Yantai (CN); Zuyi Sun, Yantai (CN); Bingliang Yang, Yantai (CN); Qingjian You, Yantai (CN); Chunxia Wang, Yantai (CN); and Wenjing Qin, Yantai (CN)
Assigned to YANTAI POWER PLANT OF HUANENG SHANDONG POWER GENERATION CO., LTD, Shandong (CN)
Filed by YANTAI POWER PLANT OF HUANENG SHANDONG POWER GENERATION CO., LTD., Yantai (CN)
Filed on Feb. 25, 2025, as Appl. No. 19/062,082.
Claims priority of application No. 202410319356.5 (CN), filed on Mar. 19, 2024.
Int. Cl. F01K 13/00 (2006.01); F01K 7/16 (2006.01)
CPC F01K 13/003 (2013.01) [F01K 7/165 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A frequency modulation auxiliary device for a thermal power plant based on a dual electric energy converter, comprising a boiler, a connecting channel, a frequency modulation auxiliary mechanism, a first air inlet pipe and a second air inlet pipe;
wherein the connecting channel is fixedly installed at a bottom end of the boil, and a support frame is sleeved outside the boiler, and left and right sides of the connecting channel are respectively a feeding channel and an air inlet channel, and a slag outlet is fixedly installed at a bottom end of the connecting channel, and a cinder collecting box is placed at a lower end of the slag outlet, the frequency modulation auxiliary mechanism is arranged on a right side of the boiler;
the device further comprises:
a first temperature sensor, used for detecting an internal actual combustion temperature of the boiler;
a second temperature sensor, used for detecting an external surface temperature of the boiler;
a third temperature sensor, used for detecting a furnace outlet temperature of the boiler;
a controller and an alarm, wherein the controller is electrically connected with the first temperature sensor, the second temperature sensor, the third temperature sensor and the alarm;
operating by the controller based on the first temperature sensor, the second temperature sensor, the third temperature sensor and the alarm comprises:
step 1, calculating actual heat transfer coefficient K of a surface of the boiler according to formula (1) and detection values of the first temperature sensor and the second temperature sensor;

OG Complex Work Unit Math
wherein α is coal utilization coefficient, β is surface coating thermal resistance of the boiler, Z is surface heating-surface strength of the boiler, μ is system blackness, T1 is a detection value of the first temperature sensor, T2 is a detection value of the second temperature sensor, and λ is tube wall ash scale layer thermal resistance of the boiler;
step 2, calculating coal consumption Q in the boiler in unit time according to formula (2) and a detection value of the third temperature sensor;
comparing the coal consumption Q in the boiler in unit time with a preset coal consumption range by the controller, and wherein when actual coal consumption is lower than the preset coal consumption range, the controller controls the alarm to give an alarm;

OG Complex Work Unit Math
wherein c is a flame shape coefficient in the boiler, δ is a thermal efficiency coefficient, TL is theoretical combustion temperature in the boiler, T3 is a detection value of the third temperature sensor, φ is a thermal insulation coefficient of the boiler, V is average heat flow in the boiler, S is heating area inside the boiler, and ρ is coal density in the boiler.