A start-up mode of a dual-machine regenerative small steam turbine

Abstract

The invention provides a start-up mode of a dual-machine reheating small steam turbine. The steam inlet side of the small steam turbine is connected to a feed water pump through a speed regulating device, and a power balance generator is connected to the exhaust side of the small steam turbine. The small steam turbine reheats steam through the cold section of an ultra-high pressure cylinder. The high-parameter steam source is throttling and distributed, and the working steam of the small steam turbine enters the steam inlet chamber of the cylinder tangentially from both sides of the cylinder through two main steam regulating valves. When the large steam turbine runs with 10% of the rated load, start the regenerating small steam turbine, control the steam intake through the regulating valve, and put into operation the bypass from the outlet to the inlet of the feed water pump. Low-load operation; when the large steam turbine carries 10% of the rated load, the small steam turbine runs rapidly and increases the speed to 3000r / min. After stabilization, it is connected to the grid with the initial load, and the load is raised until the valve is fully opened, and then the small turbine is heated up to increase the pressure and load. When the large machine carries 20% of the rated load, the steam pump and the electric pump run in parallel. When the large machine carries 30% of the rated load, the electric pump stops running, and the small machine increases 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 reheating temperature rises, resulting in a corresponding increase in the temperature of regenerative extraction steam and superheater, reaching 580℃. 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 investment cost of the power ...

AI Technical Summary

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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