Thermal power plant heat supply and steam extraction overbottom pressure utilization system with back pressure turbine

Abstract

A thermal power plant heat supply and steam extraction overbottom pressure utilization system with a back pressure turbine comprises the back pressure turbine connected with a heat supply and steam extraction pipeline. A steam exhaust port of the back pressure turbine is connected with an inlet in a heat releasing side of a vacuum type heating network heater, drain water of the vacuum type heating network heater flows through an outlet in the heat releasing side of the vacuum type heating network heater to return back to a thermodynamic system through a pipeline, an inlet in the heat absorbing side of the vacuum type heating network heater is connected with heating network returned water through a pipeline, and an outlet in the heat absorbing side of the vacuum type heating network heater is connected with heating network supplied water through a pipeline. The overbottom pressure produced through heat supply and steam extraction of a thermal power plant are recycled through the back pressure turbine to generate electricity, and the steam discharged through the back pressure turbine is supplied to the heating network heater to form a heat supply and steam overtbottom pressure recycling system. The system can efficiently utilize the thermal energy of heat supply and steam extraction, the generating capacity of a heat supply unit is increased, economic benefits of the system are improved, the coal consumption rate of the unit can be obviously reduced, and the system has obvious economic benefits and energy saving and emission reducing effects.

Description

technical field [0001] The invention relates to a system for utilizing the residual pressure of heat supply and extraction steam in a thermal power plant, in particular to a system for utilizing the residual pressure of heat supply and extraction steam in a thermal power plant using a back pressure steam turbine. Background technique [0002] The heating unit converts the chemical energy of the fuel into high-grade thermal energy for power generation, and at the same time supplies heat to the outside with the low-grade thermal energy that has done work in the heating turbine, thereby realizing cascaded utilization of thermal energy and improving energy utilization efficiency . By the end of 2009, the installed capacity of cogeneration units in my country had reached 90.59 million kilowatts, accounting for more than 10% of my country's total installed power capacity. At the same time, due to the support of relevant national policies, the development momentum of cogeneration i...

AI Technical Summary

Problems solved by technology

Since the design end difference of the heating network heater is generally about 8°C, the above-mentioned heating extraction pressure is much higher than the heating system needs, and it is often necessary to throttle in actual operation, causing great losses

In order to efficiently utilize the heat energy of heat supply and extraction, some thermal power plants use heat supply and extraction to drive absorption heat pumps to recover the loss of cold sources. This scheme has relatively large profits, but the investment is large. The investment recovery period is affected by heat prices, coal prices, and national policies. Factors such as project operation mode and other factors have a great influence, and have high risks

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