Dual-machine backheating small steam turbine starting mode

Abstract

The invention provides a dual-machine backheating small steam turbine starting mode. The steam inlet side of a small steam turbine is connected with a water feeding pump through a speed adjusting device, the steam discharging side of the small steam turbine is connected with a power balance power generator, the small steam turbine achieves throttling and steam distribution through an ultrahigh pressure cylinder cold section reheating steam high-parameter steam source, and working steam of the small steam turbine enters a steam cylinder steam inlet cavity through two main steam adjusting valvesfrom the tangential direction of the two sides of a steam cylinder. When a large steam turbine carries 10% rated load after impulse starting, the backheating small steam turbine is started, the steaminlet quantity is controlled through the adjusting valves, a bypass from an outlet to an inlet of the water feeding pump is put into running, the rotating speed of the water feeding pump is adjustedthrough the speed adjusting device, and the water feeding pump is made run at the lower speed and low load; when the large steam turbine carries 10% rated load, the small steam turbine is subjected toimpulse starting to rise the speed to 3000 r / min, grid connection is carried out after stabilization to carry initial load, the load is increased until the valves are fully opened, and then the smallsteam turbine rises the temperature, the pressure and the load; when the large steam turbine carries 20% rated load, a steam pump and an electric pump do paralleling operation; and when the large steam turbine carries 30% rated load, running of the electric pump is ended, and the small steam turbine rises the load according to the load curve.

Description

technical field [0001] The invention relates to the technical field of steam turbine power generation equipment, in particular to a start-up mode of a double-machine regenerative small steam turbine. Background technique [0002] 630℃ 1000MW ultra-supercritical double-reheat steam turbine reheat temperature increases, resulting in a corresponding increase in the temperature of the regenerative extraction steam and the temperature of the superheater, reaching 580°C. A unit composed of a large steam turbine and a small steam turbine) heat recovery system. The regenerative extraction steam in the high-temperature section is extracted from the small steam turbine, and the maximum extraction temperature does not exceed the exhaust temperature of the ultra-high pressure cylinder, that is, 440°C. The dual-machine recuperation system not only solves the materials used for the regenerative steam extraction equipment, but also improves the economy of the steam turbine and reduces the...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the problems existing in the prior art, provide a start-up mode of a double-machine heat-regenerating small steam turbine to solve the problem of multi-variable and multi-system coordination during the start-up and operation of the double-machine heat-regenerating small steam turbine, which is difficult to control The problem

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