Steam condensing and backpressure switchable steam turbine power generation system and using method thereof

Abstract

The invention discloses a steam condensing and backpressure switchable steam turbine power generation system and a using method thereof. The system comprises a generator, a medium-high pressure cylinder and a low-pressure cylinder, wherein the generator is coaxially connected to the medium-high pressure cylinder, and a rotating shaft of the medium-high pressure cylinder is connected with a rotating shaft of the low-pressure cylinder through a clutch; a steam exhaust port of the medium-high pressure cylinder is provided with a first branch and a second branch, the first branch communicates witha steam inlet of the low-pressure cylinder, and the second branch can be communicated with a heating network heater; when the clutch is closed, the first branch is communicated, the second branch isdisconnected, and the system is in a non-heating season pure condensing power generation mode; when the clutch is closed, the first branch and the second branch are both communicated, and the system is in a heating season condensing heat supply mode; and when the clutch and the first branch are both disconnected, the second branch is communicated, and the system is in a heating season pure backpressure heat supply mode. The system and the using method thereof are simple and reliable, efficient utilization of energy for heat supply and power generation in winter is guaranteed, flexible adjustment of a unit is realized, and meanwhile, normal operation of the unit in the non-heating season is guaranteed.

Description

technical field [0001] The invention relates to the technical field of thermoelectricity, in particular to a steam turbine power generation system with switchable steam condensation and back pressure and a use method thereof. Background technique [0002] In the cogeneration steam turbine generator set, the back pressure machine is widely used because it eliminates the cold source loss of the condenser, has high thermal cycle efficiency, reduces coal consumption for power generation and heat supply, and saves energy. However, the back pressure machine also has the following disadvantages: poor adaptability to load changes, and the power generation of the unit is subject to changes in thermal load. When the heat load is low, the efficiency of the steam turbine decreases, thereby reducing the economic benefits; and the back-pressure unit cannot operate normally due to the lack of heat users in the non-heating season, causing the unit to be idle in the non-heating season. [0...

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