Cold reheating and hot reheating cooperative steam supply system and method

Abstract

The invention discloses a cold reheating and hot reheating cooperative steam supply system and method. The steam supply system is arranged in a thermal generator set, wherein first-section steam extraction and second-section steam extraction of a high-pressure cylinder are connected to steam side inlets of a high-pressure heater 1 and a high-pressure heater 2 through pipelines respectively, in a reheating system, a hot section of a reheating steam pipeline is connected between an outlet of a boiler reheater and a steam inlet of a medium-pressure cylinder of a steam turbine, a cold section of the reheating steam pipeline is connected between a steam exhaust port of a high-pressure cylinder and an inlet of the boiler reheater, reheating steam pipeline cold-section extraction steam is connected with a cold-section steam inlet of a steam supply header through a cold-section steam extraction pipeline, in the reheating system, reheating steam pipeline hot-section extraction steam is connected with a steam cooler steam side inlet through a hot-section steam extraction pipeline, and a steam cooler steam side outlet is divided into two branches, the first branch is connected with a hot-section steam inlet of the steam supply header, the second branch is connected with a second-section steam extraction pipeline of the high-pressure cylinder, and the two ends of the water side of a steamcooler are connected with a water side inlet of the high-pressure heater 1 and a water side outlet of the high-pressure heater 2 respectively.

Description

Technical field: [0001] The invention relates to a cold reheating and hot reheating cooperative steam supply system and method, which are used for extracting steam from the cold section (cold reheating) of the reheat steam pipeline and extracting steam from the hot section (hot reheating) of the reheating steam pipeline for steam supply, belonging to field of steam turbines. Background technique: [0002] Large-scale thermal power units can not only realize their own energy saving and consumption reduction through cogeneration of heat and power, but also meet the heat parameters requirements of various heat users. However, in recent years, the proportion of new energy power generation such as wind power and solar power has been increasing, and these new energy power generation is affected by natural factors with great randomness, which leads to an increase in the pressure on power grid peak regulation. At present, only relying on pure condensing units to participate in powe...

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Problems solved by technology

Among them, the pressure parameters of the cold resteam pipeline for steam extraction and heat supply are relatively high, the temperature is suitable, and the thermal economy is high, but the amount of steam extraction is limited by the wall temperature of the boiler reheater and cannot be extracted in large quantities. 6% of the re-steam volume; using the hot re-steam pipeline to extract steam and supply heat to the outside after cooling down can not be affected by the boiler, so as to achieve a substantial increase in heating and extraction steam, but due to its high steam temperature, it needs Heat can be supplied after cooling down, so its economy is poor

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