Multi-steam turbine combined power generation type ultra-supercritical unit

Abstract

The invention relates to a multi-steam turbine combined power generation type ultra-supercritical unit which comprises an ultra-supercritical pressure secondary heating boiler (comprising a heating evaporation overheater, a primary reheater and a secondary reheater), a front steam turbine generator unit (comprising an ultrahigh-pressure cylinder and a back pressure extraction turbine) and a plurality of low-parameter steam turbine generator units, wherein the steam outlet of the heating evaporation overheater is connected with the steam inlet of the ultrahigh-pressure cylinder through a steam conveying pipeline; the steam outlet of the ultrahigh-pressure cylinder is connected with the steam inlet of the primary reheater and the steam inlet of the back pressure extraction turbine through pipelines respectively; the steam outlet of the back pressure extraction turbine is connected with the inlet of an oxygen remover through a pipeline; the steam outlet of the primary reheater is connected with the steam inlet of a high-pressure cylinder of the low-parameter unit through a pipeline; the steam outlet of the high-pressure cylinder is connected with the inlet of the secondary reheater through a pipeline. According to the ultra-supercritical unit provided by the invention, the circulating heat efficiency of the two or more low-parameter generator units is greatly improved, the power consumption is greatly reduced, and huge energy-saving and emission-reducing benefits are realized.

Description

technical field [0001] The invention relates to a multi-steam turbine combined power generation ultra-supercritical unit. Background technique [0002] Existing steam turbines are classified according to steam parameters (pressure and temperature): [0003] Low-pressure steam turbine: the main steam pressure is less than 1.47Mpa; [0004] Medium pressure steam turbine: the main steam pressure is 1.96-3.92Mpa; [0005] High-pressure steam turbine: the main steam pressure is 5.88-9.8Mpa; [0006] Ultra-high pressure steam turbine: the main steam pressure is 11.77-13.93Mpa; [0007] Subcritical pressure steam turbine: the main steam pressure is 15.69-17.65Mpa; [0008] Supercritical pressure steam turbine: the main steam pressure is greater than 22.15Mpa; [0009] Ultra-supercritical pressure steam turbine: the main steam pressure is greater than 28Mpa or the inlet steam temperature is higher than 580°C. [0010] Traditional low-parameter ultra-high voltage generator sets...

AI Technical Summary

Problems solved by technology

[0012] The disadvantage of this implementation technology is that it can only improve the flow efficiency of the unit, but cannot change the substantive problem that the unit’s inlet steam parameters are low, which affects the efficiency of the entire unit, resulting in high energy consumption for power supply.

[0013] Among the above-mentioned existing transformation technologies, the potential of the current advanced technology for power generation cannot be fully utilized, and the upgrading and transformation of a single unit is carried out unit by unit, the construction period and construction cost are bound to be high, and sometimes the requirements of the construction site are difficult to meet

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