Header-system connecting system for improving efficiency of deep peak regulation low-pressure cylinder and operation method

Abstract

The invention discloses a header-system connecting system for improving the efficiency of a deep peak regulation low-pressure cylinder and an operation method. The header-system connecting system comprises steam-water systems of steam turbine units and an additional system. The additional system communicates main steam, reheat cold section and hot section steam, low-pressure cylinder extracted steam and final supplied water to corresponding headers. When boilers in parts of 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 recycled, and the effect that the units do not stop while the boilers are shut down is achieved. In addition, condensate pumps and water supply pumps of the units in which the boilers are shut down do not work, and more energy is saved. By the method, under the operation 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 condition is further reduced.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a connection system and an operation method of a main pipe for improving the efficiency of a deep peak-shaving low-pressure cylinder. Background technique [0002] At present, thermal power units still account for a large proportion in the domestic power market, while the development of new energy is changing with each passing day, and the installed capacity is increasing year by year. In order to accommodate and absorb the growing power generation capacity of new energy units, the power grid has put forward higher requirements for the deep peak-shaving capability of thermal power generation units. [0003] However, due to equipment design functions and environmental protection emission restrictions, the minimum load value of boiler equipment is still subject to relatively large restrictions even after the "low-load stable combustion" technical transformation a...

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Problems solved by technology

[0003] However, due to equipment design functions and environmental protection emission restrictions, the minimum load value of boiler equipment is still subject to relatively large restrictions even after the technical transformation and optimization of "low-load stable combustion"

[0004] 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 is operating in a unitary system, the steam flow through the low-pressure cylinder is significantly reduced under low-load operating conditions of the steam turbine, resulting in a significant decrease in the efficiency of the low-pressure cylinder, especially when the steam turbine is operating under deep peak regulation. Decreased efficiency of low-pressure cylinders can lead to a sharp increase in steam turbine heat rate

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