Double-cylinder coaxial combined cycle heat supply gas turbine

Abstract

The invention discloses a double-cylinder coaxial combined cycle heat supply gas turbine. The double-cylinder coaxial combined cycle heat supply gas turbine comprises a high pressure module and a low pressure module which are distributed coaxially; a high and medium pressure rotor is arranged in the high pressure module; a low pressure rotor is arranged in the low pressure module; one end of the high and medium pressure rotor close to a medium pressure cylinder is connected with a motor; one end of the high and medium pressure rotor close to a high pressure cylinder is coaxially connected with an intermediate shaft; the other end of the intermediate shaft is connected with the low pressure rotor through an autosynchronous clutch; and the high pressure module and the low pressure module are communicated through a low pressure communication pipe which is provided with a low pressure valve bank. The gas turbine can realize the on-line paralleling or disconnection of the high and medium pressure module and the low pressure module, is suitable for single backpressure running of the high pressure module, steam extraction and condensation running of the high pressure module and the low pressure module and steam condensation running of the high pressure module and the low pressure module, and can improve the energy utilization rate to the maximum extent according requirements; and the running mode of the gas turbine is very flexible.

Description

technical field [0001] The invention relates to the combined heat and power steam turbine technology, discloses a double-cylinder coaxial combined cycle heat supply steam turbine, and particularly relates to a combined heat and power steam turbine suitable for back pressure operation in winter and condensation operation in summer. Background technique [0002] The steam turbine is one of the key power equipment in the construction of a power station, and it is an energy conversion device that converts thermal energy into mechanical energy and then into electrical energy. The high-temperature and high-pressure steam produced by the boiler, through the steam turbine, converts the thermal energy and pressure potential energy into the mechanical energy of the steam turbine, which drives the rotor of the steam turbine to output shaft work, and the mechanical energy is transmitted to the generator through the shaft of the steam turbine, thereby converting the mechanical energy into...

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Problems solved by technology

[0005] However, although the cogeneration steam turbine has a high thermal energy utilization rate, it also has disadvantages: the operating conditions generally vary greatly, and there is generally only one optimal design condition for the steam turbine. will fall

For example, in the northern regions of China, heating is generally required in winter. At this time, the combined heat and power steam turbine should follow the principle of determining electricity by heat, and input heat energy to the heating network; in summer, the northern regions generally do not need heating and pumping. At this time, the steam turbine does not need to extract steam and enters the operation state of pure condensing steam. In order to meet the operation requirements of this working condition, the flow of the low pressure part needs to be equipped with longer blades, and the longer blades are used in winter. In the working condition, there is the problem of low efficiency, which is a difficult problem for the combined heat and power steam turbine, because there is only one optimum point of efficiency, and the latter is generally considered as the design working condition in the design, because the heating time in winter is generally About one quarter, and the operation time of condensing steam generally takes three quarters

However, the problem brought about by this is that in winter working conditions, due to the low-pressure flow efficiency of the steam turbine is too low, the use of energy has inevitably been wasted.

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