Thermodynamic system of negative-pressure exhaust steam turbines and air extraction type heaters and use method

Abstract

The invention discloses a thermodynamic system of negative-pressure steam exhaust turbines and air extraction type heaters and a using method. The thermodynamic system comprises heat supply network heating steam pipelines, the negative-pressure steam exhaust back-pressure turbines and the air extraction type heat supply network heaters. Each heat supply network heating steam pipeline is connected with an inlet of the corresponding negative-pressure steam exhaust back-pressure turbine and a main steam inlet of the corresponding air extraction type heat supply network heater through welded steel pipes. The negative-pressure steam exhaust back-pressure turbines and the air extraction type heat supply network heaters are arranged in a series connection manner. Outlets of the negative-pressure steam exhaust back-pressure steam turbines are connected with inlets of the heat supply network heaters through welded steel pipe steam exhaust pipelines, and the air extraction type heat supply network heaters are connected with vacuum pumps through welded steel pipe air exhaust pipelines. On the premise that the external heat supply capacity meets the heat supply requirement and the economical efficiency of a main engine is improved, the pressure difference energy loss of heating steam extraction of a power plant is recycled, the cold source loss of part of steam is reduced, and on the premise that centralized heat supply is guaranteed, power generated by a back-pressure generator set is merged into a plant power system, so that the plant power consumption rate can be reduced, and the purposes of saving energy and reducing consumption are achieved.

Description

technical field [0001] The invention belongs to the technical field of heat supply systems, and in particular relates to a thermal system and a use method of a negative pressure exhaust steam turbine and an air extraction heater. Background technique [0002] In the winter heating system in the north, most of them are heat network heaters at the first station of a certain stage extraction steam heater of a steam turbine of a large thermal power generation enterprise. Backpressure steam turbines are installed on steam to achieve cascaded utilization of heating steam, which is a good energy-saving project. However, the inlet parameters of this back pressure steam turbine are generally higher than 0.5MPa. (a) the absolute pressure is above, and the exhaust steam is higher than the atmospheric pressure, not lower than 0.15MPa. (a) the absolute pressure, the corresponding heat network heater is also positive pressure inlet steam The steam-water heat exchanger, that is, the heati...

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Problems solved by technology

However, the inlet parameters of this back pressure steam turbine are generally higher than 0.5MPa. (a) the absolute pressure is above, and the exhaust steam is higher than the atmospheric pressure, not lower than 0.15MPa. (a) the absolute pressure, the corresponding heat network heater is also positive pressure inlet steam The steam-water heat exchanger, that is, the heating network heater; the traditional thermal system has the phenomenon of pressure difference energy loss, and the recovery rate of effective enthalpy drop is not high, and the coal consumption is relatively large

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