Thermal power plant and united thermodynamic system for thermal power plant

Abstract

The invention discloses a thermal power plant and a united thermodynamic system for the thermal power plant. The thermal power plant comprises a secondary reheating coagulated steam unit and a backpressure unit; the united thermodynamic system comprises a thermodynamic system of the secondary reheating coagulated steam unit and the thermodynamic system of the backpressure unit; a reheating system from a condenser to a deaerator is shared by the thermodynamic system of the secondary reheating coagulated steam unit and the thermodynamic system of the backpressure unit; the condensed water of the secondary reheating coagulated steam unit and the replenished desalted water of the backpressure unit pass through the shared reheating system and then are divided into two paths; one path enters the secondary reheating coagulated steam unit; and the other path enters the backpressure unit. The united thermodynamic system provided by the invention can meet the industrial requirements of large capacity and high parameter heat supply; the thermodynamic cycle efficiency is greatly increased; the fuel consumption is reduced; the pollutant emission is reduced; and meanwhile, the investment of the thermal power plant is greatly reduced.

Description

technical field [0001] The invention relates to power equipment, in particular to a thermal system in a thermal power plant. Background technique [0002] In the prior art, in power plants that use steam turbines for power generation and heat supply, the middle extraction steam of the steam turbine of the double reheat condensing unit is usually used for external heat supply, or the exhaust steam of the steam turbine of the back pressure unit is used for external heat supply. [0003] For the double-reheat condensing unit that uses steam extraction in the middle of the steam turbine to supply heat to the outside, there are two main problems: first, the steam volume of the steam extraction in the middle of the steam turbine accounts for a small proportion of the total steam volume of the steam turbine, and the heat supply is small; , the pressure of the steam supply is required to be stable, but the pressure of the steam extraction in the middle of the turbine decreases with ...

AI Technical Summary

Problems solved by technology

[0003] For the double-reheat condensing unit that uses steam extraction in the middle of the steam turbine to supply heat to the outside, there are two main problems: first, the steam volume of the steam extraction in the middle of the steam turbine accounts for a small proportion of the total steam volume of the steam turbine, and the heat supply is small; , the pressure of the steam supply is required to be stable, but the pressure of the steam extraction in the middle of the turbine decreases with the decrease of the load of the steam turbine. functional loss

Moreover, for high-pressure heating of about 5MPa, in order to meet the low-load pressure requirements, it is necessary to throttle from the main steam (high-load about 25MPa); (High load about 6MPa) throttling, so there is a large throttling loss

[0005] For the back-pressure unit that uses the steam turbine exhaust steam of the back-pressure unit to supply heat to the outside, the main problems are: first, the power generation of the unit changes with the heat supply, and the power generation decreases when the heat supply decreases. The generator set shuts down during heating; secondly, the power generation capacity of the back pressure unit is small, the largest back pressure unit in China is about 80MW, which is far lower than the conventional double reheat condensing steam generator set (300~1000MW)

Therefore, the investment is large, and there is a certain degree of waste at the same time

Images