Extraction condensing heat supply system additionally provided with non-reheat medium-pressure steam turbine

Abstract

The invention belongs to the technical field of thermoelectricity, and relates to an extraction condensing heat supply system additionally provided with a non-reheat medium-pressure steam turbine. A part of steam is separated from a steam exhaust port of a high-pressure cylinder of a main steam turbine to enter the added non-reheat medium-pressure steam turbine, and the rest of steam enters a reheater of a boiler and a No.II high-pressure heater; the steam entering the medium-pressure steam turbine does not need to be reheated, an independent generator II is driven, four-stage extraction steam of the medium-pressure steam turbine serves as a heat source for a No.III high-pressure heater, a No.V low-pressure heater, a No.VI low-pressure heater and a deaerator to replace a part of regenerative extraction steam of the main steam turbine, and the extraction steam of the medium-pressure steam turbine is discharged into a heater for heating network to heat heating network water. An effect of additionally installing the medium-pressure steam turbine in the extraction condensing heat supply system disclosed by the invention is to reduce heat exchange exergy loss by reducing heat exchange temperature difference of a part of regenerative heaters and the deaerator; work capability of heat supply steam flow is increased, and therefore heat loss of a high-capacity heat supply unit is caused by a high extraction steam parameter is reduced; and the extraction condensing heat supply system disclosed by the invention is suitable for heat supply and energy conservation transformation on 300 MW (megawatt), 600 MW and above steam turbine units.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a condensate extraction heat supply system with an additional non-reheating medium-pressure steam turbine. Background technique [0002] Cogeneration technology is an important way to cleanly and efficiently utilize coal and realize energy saving and emission reduction of thermal power units. The energy utilization efficiency of the advanced coal-fired units using combined heat and power can reach about 80%. Compared with the coal consumption of the existing supercritical units of 310g / kWh (power supply efficiency 39.68%), the thermal efficiency is nearly doubled. At the same time, the combined heat and power unit reduces the loss of cold sources and greatly reduces the environmental pollution caused by burning fossil energy for direct heating. In the five-year plan for energy conservation and emission reduction released by the State Council during the "Ele...

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Problems solved by technology

[0006] Therefore, there is an urgent need for a heating method that can provide flexible range and low parameters on the premise of ensuring heat supply and power generation, and is suitable for large-capacity units of 300MW and above, so as to solve the problem of insufficient heat supply faced by high-parameter condensing units. Key Issues in Energy Conservation

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