Abstract
A method for operation study of a compressorless combined-cycle gas turbine (CCCGT) unit during transients from one steady-state mode to another, including during start-up and shutdown, is proposed. As an example, studies of the transients of an energy complex with a capacity of 60 MW are given. A variant of an algorithm concept for start/stop and transients of such an energy complex is proposed. This concept includes algorithms for starting from the three initial states of the energy complex (cold, hot and standby). For these algorithms, the time and energy consumption characteristics are estimated. It is shown that from a cold state, such an energy complex can be started and brought to the nominal mode in 1.5-2 hours. At the same time, the energy costs will not exceed energy consumption for its own needs in a nominal mode. The start-up time from the hot state can be reduced to 20-25 minutes, and the start-up from the standby state can be 2.5-3 minutes. The proposed concept of control algorithms for transient modes is such, so that a temperature state of the main components and parts of the energy complex is provided at a constant temperature. Thus, the time of transients will be determined only by the speed of the regulatory authorities. Consequently, power systems operating on the CCCGT cycle can operate equally efficiently, both in the basic mode and in the power control mode.
Highlights
Fundamentally new energy generation cycles are actively considered, which provide high thermal efficiency, and provide minimal environmental impact [1], [2], [3], [4], [5]
One of the groups was excluded from consideration. This group includes: fuel storage and preparation equipment; refrigeration equipment; liquid oxygen production and storage equipment; all infrastructure for heat transfer to the heating system. The exclusion of this group from consideration is due to the fact that, for one reason or another, it practically does not affect the dynamics of transient processes
The law of regulating the parameters of the combined cycle gas turbine (CCCGT) is proposed such that the constant temperature of the working fluid at the turbine inlet is maintained at all operating modes
Summary
Fundamentally new energy generation cycles are actively considered, which provide high thermal efficiency, and provide minimal environmental impact [1], [2], [3], [4], [5] Among such cycles, one can distinguish a cycle of a compressorless combined cycle gas turbine (CCCGT) unit [6], [7], [8]. During a creation process of new energy complexes, it is important to have a concept of a complex operation in non-calculated modes at the very early stages of design. This includes transitioning from one steady-state mode to another, start and stop. The objectives of a research are: to analyze possible algorithms for start / stop the power complex and operating in transient modes; to determine time characteristics of start/stop and transients; to formulate the requirements for the designed equipment necessary for the implementation of these operating modes
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