Active control mechanism for broadening lean burn flameout boundary of combustion chamber of heavy duty gas turbine

Abstract

The invention discloses an active control mechanism for broadening a lean burn flameout boundary of a combustion chamber of a heavy duty gas turbine. The active control mechanism comprises an oil supply system, an oil pump, an overflow valve, an elastic element, a nozzle, a backpressure valve, a connecting rod, a sleeve and an axial cyclone. The elastic element comprises two spring tubes which are arranged in parallel and a closed cavity, and the tail ends of the spring tubes are communicated with the closed cavity to form a free end of the elastic element. The oil pump is communicated with the oil supply system and is respectively connected with the inlet ends of the nozzle and the overflow valve; an overflow port of the overflow valve and the outlet end of the backpressure valve are communicated with the oil supply system; the inlet end of the elastic element is connected with the outlet end of the overflow valve; the outlet end of the elastic element is connected with the inlet end of the backpressure valve; the free end of the elastic element is hinged with the connecting rod; and the connecting rod is hinged with the sleeve. According to the active control mechanism, the lean burn flameout boundary of the combustion chamber of the heavy duty gas turbine is effectively broadened, the phenomenon of coking and carbon deposition due to immobilization of fuel in the single spring tube can be solved, and the service life of the control mechanism is prolonged.

Description

technical field [0001] The invention relates to an active control mechanism, in particular to an active control mechanism for widening the lean-burn and flameout boundary of a heavy-duty gas turbine combustion chamber. Background technique [0002] The lean-burn-out boundary is one of the main characteristics of the ground-based heavy-duty gas turbine combustor, which is directly related to the reliability of the gas turbine operating at low loads. In order to meet the safe operation of heavy-duty gas turbines under various loads, reduce the number of unit trips, and increase the operating life of gas turbines, the lean-burn and flameout boundary of the combustion chamber is required to be very wide. From the visual lean-burn flameout test, it can be seen that when the combustion chamber is close to the lean-burn flameout state, the flame only exists in a part of the space near the head of the flame tube, so the key factor affecting the flameout characteristics is the local ...

AI Technical Summary

Problems solved by technology

In addition, in the two control mechanisms they adopted, a single spring tube structure is adopted, which makes the fuel entering the spring tube in a stagnant state, so when the temperature in the combustion chamber is high, the fuel in the spring tube is prone to Coking and carbon deposits will block the spring tube and affect the function and life of this type of control mechanism

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