300MW-capacity-level low vacuum heat supply steam turbine system and adjusting method thereof

Abstract

The invention belongs to the technical field of thermoelectricity, and relates to a 300MW-capacity-level low vacuum heat supply steam turbine system and an adjusting method thereof. The system consists of a 300MW-capacity-level low vacuum heat supply steam turbine generator set and a power plant cold end and heat supply load coupling adjusting system. A steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder I, a steam turbine low-pressure cylinder II and a generator are uniaxially arranged in the steam turbine generator set. In the heating period, the back pressure of the two low-pressure cylinders rises, and a steam turbine set runs under low vacuum; steam is uniformly divided into two strands when entering a communicating pipe at the front of the two low-pressure cylinders, so that the flow of each low-pressure cylinder is half the flow of the low-pressure cylinder of the 300MW-capacity-level steam turbine in the prior art, and the flow is greatly reduced; the length of the last-stage blade is shortened, the adjusting range of back pressure is expanded, and the safety of the system is improved; and in the non-heating period, the steam turbine set runs under the straight condensing condition. The invention is applicable for a 300MW-capacity-level combined heat and power steam turbine set to implement low vacuum heat supply.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a low-vacuum heating steam turbine system with a capacity of 300MW and an adjustment method thereof. Background technique [0002] In the "Energy Conservation Law of the People's Republic of China", the state encourages the development of cogeneration of heat and power, centralized heating, and improves the utilization rate of thermal power units. The "National Regulations on the Development of Cogeneration of Heat and Power" also pointed out that cogeneration of heat and power can save energy, improve the environment, improve the quality of heat supply, and increase power supply. Measures are an important part of central heating and a public welfare infrastructure to improve people's quality of life. The condenser operates in low vacuum, and the circulating water heating method, as a kind of central heating method, has attracted more and more attention bec...

AI Technical Summary

Problems solved by technology

However, at present, the low-vacuum circulating water heating units of steam turbines are transformed from small and medium-capacity pure condensing units. Cylinder and single cylinder layout, large exhaust flow, high final stage blades, low vacuum heating, exhaust pressure rises, directly affects the thermal expansion of the unit, differential expansion, vibration, string shaft and other indicators, the unit cannot run safely and stably

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