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Upgrade of the thermal power plant flexibility by the steam accumulator

机译：蒸汽蓄能器升级热电厂的灵活性

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摘要

Thermal power plants are forced to operate under frequent load changes in energy systems with increased share of solar and wind power plants. These load changes increase thermal power plant aging and reduce their efficiency. Therefore, solutions for energy storage are sought in order to accumulate energy in periods of lower power demand and produce excess power in periods of increased demands. In the present paper the steam accumulator as the thermal energy storage device is applied in a 650 MWe coal-fired thermal power plant to increase its flexibility under the demand for the variable load changes. The steam accumulator is charged during periods of lower power demand, as during the night hours, and discharged during peak load demands. The steam accumulator with volume of 600 m(3) is charged with superheated steam (pressure 4.5 MPa and temperature 335 degrees C) extracted from the exit of high pressure steam turbine. The steam discharged from the steam accumulator replaces the turbine steam extraction for two low pressure heaters: a 59.5 MWt and a 54.6 MWt heater operating at 0.56 MPa and 0.23 MPa steam pressure. This replacement results in an increase of the steam flow rate through the turbine and the turbine power gain of 27.3 MWe during 27 min and 11.5 MWe for additional 13 min. The proposed solution of the steam accumulator installation in the power plant is a new design. The upgrade of power plant flexibility by steam accumulator is demonstrated.
机译：热电厂被迫在能源系统的频繁负荷变化下运行，其份额增加了太阳能和风力发电厂。这些负荷变化增加了热电厂老化并降低了效率。因此，寻求用于储能的解决方案，以便在较低的电力需求期间积累能量，并在增加需求的时期产生多余的功率。在本文中，蒸汽蓄能器作为热能储能装置应用于650 MWE燃煤热电厂，以提高其对可变负载变化的需求的灵活性。蒸汽蓄能器在较低的电源需求期间充电，如夜间在夜间，并在峰值负载需求期间放电。具有600米（3）的容积的蒸汽蓄能器被充电，从高压蒸汽轮机出口中提取过热蒸汽（压力4.5MPa和温度335℃）。从蒸汽蓄能器排出的蒸汽取代了两个低压加热器的涡轮机蒸汽提取：59.5 MWT和54.6 MWT加热器，在0.56MPa和0.23MPa蒸汽压力下工作。这种替换导致通过涡轮机的蒸汽流速和27.3mWE在27分钟和11.5mWe的涡轮机动力增益增加13分钟。所提出的蒸汽蓄能器安装解决方案在发电厂中是一种新设计。通过蒸汽蓄能器升级电厂升高。

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