Backpressure machine acting and heat supply device for steam exhaust heat supply network of intermediate pressure cylinder of steam turbine

Abstract

The invention discloses a backpressure machine acting and heat supply device for a steam exhaust heat supply network of an intermediate pressure cylinder of a steam turbine. The backpressure machine acting and heat supply device comprises a backpressure machine and control equipment thereof, wherein an electric generator is arranged at a power output end of the backpressure machine to output electric energy, or an electric motor is arranged at the power output end of the backpressure machine to drive power equipment. The backpressure machine is additionally arranged on a pipeline between exhausted and extracted steam of the intermediate pressure cylinder and a first heater of a heat supply network so that the exhausted and extracted steam of the intermediate pressure cylinder drags the electric generator to generate electricity after being expanded by the backpressure machine and acting, or the power equipment is coaxially dragged by an SSS (Synchro-Self-Shifting) clutch and the electric motor; the steam exhausted after the backpressure machine acts is supplied to the first heater of the heat supply network. Compared with the prior art, the backpressure machine acting and heat supply device has the beneficial effects that the throttling loss of the exhausted steam of the intermediate pressure cylinder is reduced to the minimal without influencing a heat supply requirement by additionally arranging the backpressure machine, and part energy of the extracted steam is converted into high-grape power output which is used for generating the electricity or coaxially dragging the power equipment with the electric motor, so that the remarkable technical effects of energy conservation, consumption reduction and low-carbon environment protection are achieved.

Description

technical field [0001] The invention relates to a steam turbine medium pressure cylinder exhaust heat supply network system, in particular to a back pressure machine work and heat supply device used in the steam turbine medium pressure cylinder exhaust steam heat supply network. Background technique [0002] At present, the 300MW thermal power generating units in my country generally adopt the method of perforating the exhaust connecting pipe of the medium-pressure cylinder to extract steam and transport it to the first station of the heating network, which is mainly used to store the heaters of the heating network. , circulating water pumps, drain pumps, and centralized control systems, etc. Due to the structural limitations of the steam turbine itself, the exhaust pressure of the medium-pressure cylinder of some units is 0.4MPa-0.5MPa, and the temperature of the external heating water supply is generally 90°C-110°C , the pressure at the first station of the heating network o...

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Problems solved by technology

However, in the technical solution of the invention, the installed back pressure machine is not equipped with a power output device, so the technical effect of utilizing the additional back pressure machine for external power output cannot be realized, for example, the installation of the back pressure machine cannot be realized. The work of expansion is used to drive the generator to generate electricity, and it is impossible to drive the power equipment coaxially with the motor, so it is impossible to achieve the technical effect of minimizing the throttling loss of the medium-pressure cylinder exhaust

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