Frequency modulation auxiliary method and device for thermal power plant based on dual electric energy converter

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;
• K
• =
• 1
• a
• ×
• (
• β
• +
• μ
• ×
• (
• T
• 1
• -
• T
• 2
• )
• Z
• )
• +
• λ
• (
• 1
• )
• 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;
• Q
• =
• c
• ×
• (
• 5.7
• ×
• 10
• -
• 1
• ⁢
• 1
• ×
• K
• ×
• μ
• ×
• δ
• ×
• S
• )
• ×
• (
• T
• 3
• +
• 2
• ⁢
• 7
• ⁢
• 3
• )
• T
• L
• ×
• (
• φ
• ×
• V
• )
• ×
• ρ
• (
• 2
• )
• 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.