Novel heat supply steam turbine system and regulation method thereof

Abstract

The invention belongs to the field of thermoelectricity technologies and relates to a novel heat supply steam turbine system and a regulation method thereof. The novel heat supply steam turbine system consists of a novel heat supply steam turbine generator unit, an electric power plant cold side and a heating load coupling and regulating system, wherein a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a generator, a steam turbine I low-pressure cylinder and a steam turbine II low-pressure cylinder are coaxially arranged in the novel heat supply steam turbine generator unit. At a heating period, the unit operates at low vacuum and can meet the requirements of low-temperature heat network water at 40-80 DEG C for heat source parameters on the premise that the efficient and safe power generation is realized, and the regulation is carried out by using a cooling tower of the heating load coupling and regulating system when a heat load changes, so that the task of exhaust steam condensation of steam turbines is completed while the supply and demand of heat are balanced; and at a non-heating period, the steam turbine II low-pressure cylinder participates in the driving of the generator so as to generate power, the unit operates at pure condensation, and then, the power loss of the unit at the non-heating period is avoided. The novel heat supply steam turbine system and the regulation method of the novel heat supply steam turbine system are applicable to the heat supply of the heat and power combined generation of the heat supply steam turbine generator unit with the high capacity of 300MW or more.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a novel heating steam turbine system and an adjusting method thereof. Background technique [0002] Low-vacuum heating has a long history. Among various forms of cogeneration, low-vacuum heating has the most prominent energy-saving advantages, and can truly realize cascaded utilization of energy. However, the steam turbine for low-vacuum heating needs to meet the following requirements: heating is provided during the heating period, the steam turbine operates at low vacuum, and pure condensing power is generated during the non-heating period, and its back pressure adjustment capability requires a wide range. For small units of 100MW and below, due to the small steam flow rate and short final stage blades, the back pressure adjustment range can basically meet the above requirements; while for 200MW and above units, the steam flow rate is large and the final s...

AI Technical Summary

Problems solved by technology

For small units of 100MW and below, due to the small steam flow rate and short final stage blades, the back pressure adjustment range can basically meet the above requirements; while for 200MW and above units, the steam flow rate is large and the final stage blades Longer, if the back pressure is increased during operation, it will not only bring about a sharp drop in efficiency, but more importantly, it will cause negative reaction in the final stage, overheating of the low-pressure cylinder, and vibration of the blades, endangering the safety of the unit

Images