Cogeneration double extraction steam turbine

Abstract

The invention provides a combined heat and power supply double-extraction steam turbine. The combined heat and power double-extraction steam turbine comprises a high-pressure cylinder, a first intermediate-pressure cylinder, a second intermediate-pressure cylinder and a low-pressure cylinder which are sequentially distributed from high to low of steam inflow parameters; a steam exhaust port of the first intermediate-pressure cylinder is connected with a first intermediate-pressure steam exhaust mother pipe; the end portion of the first intermediate-pressure steam exhaust mother pipe is connected with a first adjusting steam extracting pipeline and a second intermediate-pressure steam inflow mother pipe; the end portion of the second intermediate-pressure steam inflow mother pipe is further connected with a first intermediate-pressure steam inflow branch pipe connected with a steam inlet of the second intermediate-pressure cylinder; a steam exhaust port of the second intermediate-pressure cylinder is connected with a second intermediate-pressure steam exhaust mother pipe; the end portion of the second intermediate-pressure steam exhaust mother pipe is connected with a second adjusting steam extraction pipeline and a low-pressure steam inflow pipeline connected with a steam inlet of the low-pressure cylinder. According to the combined heat and power double-extraction steam turbine, by additionally arranging the intermediate-pressure cylinders, a valve and the pipelines, double extraction of two pressure levels is achieved, and therefore the large capacity and high parameter dual-adjusting steam extraction requirement is met, and it is guaranteed that the steam turbine still conforms to the efficient designing and running requirement under the pure congealing work condition.

Description

technical field [0001] The invention relates to a steam turbine, in particular to a combined heat and power double-extraction steam turbine. Background technique [0002] Combined heat and power steam turbine generator set means that the steam turbine drives the generator to transmit electric energy to the grid, and at the same time, a part of the steam is drawn into the heating network at the proper flow position of the steam turbine to supply heat, and the other part of the steam continues to expand in the turbine channel to do work, driving the steam turbine. The output shaft of the rotor does work, so as to greatly improve the thermal efficiency and operating economy of the steam turbine. Combined heat and power steam turbines mainly have several forms such as back pressure type, steam extraction and condensing type, and steam extraction back pressure type; combined heat and power double extraction steam turbine means that the combined heat and power steam turbine provid...

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Problems solved by technology

[0004] However, the above-mentioned combined heat and power double-extraction steam turbine has the following defects: because it is provided with an adjustment steam extraction device (that is, a rotating baffle or a seat cylinder valve) between the flow-through parts of the medium-pressure cylinder, it reduces the design of the medium-pressure cylinder. Efficiency, especially the working efficiency of the steam turbine under the pure condensing condition; in addition, for the unit with high power level, due to the limitation of the structure and strength of the unit itself, it brings great challenges to the design of the adjustment and extraction mechanism of the medium pressure part. Therefore, setting and adjusting the steam extraction device in the medium pressure cylinder will also bring a series of operational restrictions and safety hazards to the unit

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