Header-system connecting system for adjusting work of high-pressure cylinders and operation method

Abstract

The invention discloses a header-system connecting system for adjusting work of high-pressure cylinders and an operation method. The header-system connecting system comprises steam-water systems of steam turbine units and an additional system. A main steam communicating header, a reheat cold section steam communicating header, a reheat hot section steam communicating header and a high-pressure heater system water inlet communicating header are additionally arranged. When boilers of parts of the units are shut down, are in hot standby or run in daily start-stop, steam turbines of the units in which the boilers are shut down can obtain main steam and reheat steam by controlling a connecting valve bank between each header and the corresponding unit, cold reheat steam of the units in which the boilers are shut down is recovered, and thus, the effect that the units do not stop while the boilers are shut down is achieved. In addition, through adjustment, the steam inlet amount of a high-pressure cylinder of a certain unit can be decreased, a high-pressure heat regenerative system does not work, supplied water enters the other units to be heated, and thus the temperature of the supplied water is remarkably increased. By adopting the method, under the operation working condition of less boilers and more units, further decoupling of the units and the boilers can be realized, and under the normal operation condition of the boilers put into operation, the output electric power rate of steam turbine generator units under the deep peak regulation operation working condition is further decreased.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a connecting system and an operation method of a female pipe for adjusting the work of a high-pressure cylinder. Background technique [0002] Modern science and technology cannot solve the problem of economical storage of large-capacity electric energy for the time being. The output of power generation and power supply equipment in the power grid must maintain a dynamic balance with the changing power load at all times. With the continuous development of the national economy and the change of power consumption structure, the power system is faced with the contradiction of large peak-to-valley difference and insufficient peak-shaving capacity. On the other hand, the large-scale use of new clean energy such as photovoltaics and wind power, and the grid-connected power generation of large-scale intermittent energy sources have exacerbated the volatility of the po...

AI Technical Summary

Problems solved by technology

[0006] However, even after the technical transformation and optimization of "low-load stable combustion" of boiler equipment, the peak-shaving capacity is still greatly limited; the unit that has undergone "thermoelectric decoupling" transformation Can improve unit flexibility within a certain range

[0007] In addition, under the deep peak shaving condition of the thermal power unit, due to the large difference between the operating state of the boiler equipment and the steam turbine equipment and the design state, the overall efficiency of the unit drops significantly

For example, when the unit system is running, the extraction pressure of the high-pressure cylinder is significantly reduced due to the reduction of the steam intake of the steam turbine, which leads to a decrease in the feed water temperature, which indirectly leads to a significant increase in the overall energy consumption of the unit

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