Axial thrust balancing structure and method for adjustable steam extraction type steam turbine

Abstract

The invention relates to a combined heat and power generation steam turbine, and particularly discloses an adjustable steam extraction type steam turbine axial thrust balancing structure and method. The balance structure comprises a rotor and a cylinder assembled with the rotor, a steam extraction device capable of adjusting steam extraction is arranged on the cylinder, a steam extraction position steam seal is arranged between the steam extraction device and the rotor, and a steam extraction position balance piston of a rotor shoulder structure is arranged on the rotor corresponding to the steam extraction position steam seal. The rotor is matched with the steam extraction position steam seal in a dynamic sealing mode through a rotor protruding shoulder of the steam extraction position balance piston. The axial thrust of the adjustable extraction steam turbine can be reliably self-balanced, so that the axial thrust range of the whole steam turbine under the two extreme working conditions of the non-extraction working condition under the maximum steam admission condition and the maximum extraction working condition under the maximum steam admission condition is reduced, and the axial thrust range of the whole steam turbine under the two extreme working conditions is improved. The adjustable extraction steam turbine can stably and safely operate in the two extreme working conditions, and the generating capacity and the heat supply capacity are improved.

Description

technical field [0001] The invention relates to a cogeneration steam turbine, in particular to an axial thrust balance structure and method of an adjustable extraction steam turbine. Background technique [0002] Adjustable (adjustable) extraction steam turbine, as a kind of combined heat and power technology, is to extract a certain pressure of steam after a certain work stage to supply heat to the outside, so as to meet the technical requirements of heat users for heat supply pressure. [0003] The adjustable extraction steam turbine needs to meet the safe operation of two working conditions, that is, the safe operation under the non-extraction condition (pure power generation mode) and the safe operation under the extraction condition (simultaneous power generation and heat supply). [0004] In recent years, with the continuous development of the electric power industry, in addition to the increase in electricity demand, the heat supply demand of cogeneration steam turbin...

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Problems solved by technology

[0010] Aiming at the above-mentioned technical problems, the general technical measure currently adopted in the industry is to replace the large-area thrust pad with an area twice that of the current thrust pad according to the limit of the doubled expansion of the axial thrust range of the two working conditions, which will make it possible to The cost of regulating and extracting steam turbines will increase significantly, and will increase the power consumption loss of steam turbine operation

Even so, it is difficult for the adjustable extraction steam turbine to operate stably and safely in the non-extraction condition under the maximum steam intake condition and the maximum extraction steam condition under the maximum steam intake condition. Not conducive to increasing power generation and heat supply

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