Steam turbine system and method for improving flexibility of heat supply unit

Abstract

The invention discloses a steam turbine system and method for improving the flexibility of a heat supply unit. A generator is provided with double output shafts, and two sets of overrunning clutches are arranged to assist rotors of steam turbine low-pressure cylinders to be separated from or connected with a rotor of the generator online. Heat supply adjusting valves are arranged on a medium-pressure communicating pipe and a low-pressure communicating pipe for assisting in adjusting steam supply parameters, and isolating valves are arranged on steam inlet pipelines of the steam turbine low-pressure cylinders for assisting in cutting off the steam turbine low-pressure cylinders. In the heat supply period, the first steam turbine low-pressure cylinder and the second steam turbine low-pressure cylinder can be cut off online according to the peak regulation requirement of a power grid. The rotors of the steam turbine low-pressure cylinders can be thoroughly separated from the generator without temperature reduction and cooling, and then the blade damage risk caused by small steam inlet amount of the steam turbine low-pressure cylinders is eliminated. One or all steam turbine low-pressure cylinders can be selectively cut off, so that the peak regulation flexibility of the unit is enhanced, meanwhile, the heat supply capacity of the unit can be greatly improved, and finally, the heatsupply economical efficiency is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of steam turbines, and relates to a steam turbine system and method for improving the flexibility of a heating unit. 【Background technique】 [0002] External heat supply can effectively reduce the energy consumption index of thermal power generation units. Cogeneration is also one of the important development directions of electric power enterprises. Peak shaving needs. [0003] However, since the heating steam needs to ensure a certain pressure, and if the steam intake of the low-pressure cylinder of the steam turbine is lower than the limit value, the blades will also be damaged. Therefore, the steam inlet flow and load of general heating units will be limited by the minimum value, making it difficult to deep peak regulation. If the steam turbine adopts high back pressure heat supply, although the economy is good, the peak regulation capability of the unit is poor, and the cylinder needs to be removed ...

AI Technical Summary

Problems solved by technology

Therefore, the inlet steam flow and load of general heating units will be limited by the minimum value, making it difficult to deep peak regulation

If the steam turbine adopts high back pressure heat supply, although the economy is better, the peak regulation capability of the unit is poor, and the cylinder needs to be removed before heating to replace the rotor, which cannot be switched online

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