A system and method for coordinating cold-regeneration and hot-regeneration steam supply

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 power generation unit, wherein the first-stage steam extraction and the second-stage steam extraction of the high-pressure cylinder are respectively connected to the high-pressure generator 1 and the high-heater steam generator through pipelines. 2 inlet on the steam side; in the reheat system, the hot section of the reheat steam pipe is connected between the outlet of the boiler reheater and the steam inlet of the medium-pressure cylinder of the steam turbine, and the cold section of the reheat steam pipe is connected between the exhaust port of the high-pressure cylinder and the steam inlet of the boiler Between the inlets of the reheater; the extraction steam at the cold section of the reheat steam pipeline is connected to the steam inlet of the cold section of the steam header through the cold section extraction pipeline, and in the reheat system, the extraction steam at the hot section of the reheat steam pipeline is drawn through the hot section The steam pipeline is connected to the steam side inlet of the evaporator, and divides the steam side outlet of the evaporator into two branches, the first branch is connected to the steam inlet of the hot section of the steam header, and the second branch is connected to the second Section extraction pipeline; the two ends of the water side of the evaporator are respectively connected to the water side inlet of high plus 1 and the water side outlet of high plus 2.

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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