Header-pipe-system connection system based on high and medium pressure cylinder zero output and operation method

Abstract

The invention discloses a header-pipe-system connection system based on high and medium pressure cylinder zero output and an operation method. The header-pipe-system connection system comprises a steam turbine unit steam-water system and an additionally-arranged system, wherein a main steam pipeline, a medium-pressure cylinder steam exhaust pipeline and a deaerator water inlet pipeline are respectively made to communicate to corresponding header pipes by the additionally-arranged system, when part of unit boilers are shut down and hot standby or two-shift system operation is performed, a boiler shut-down unit steam turbine can obtain main steam and low-pressure cylinder intake steam by controlling connecting valve sets between all the header pipes and units, boiler shut-down without shutdown is realized, and in addition, by means of the manner that exhaust steam from medium pressure cylinders of other units is fed back to boiler shut-down unit low pressure cylinders, the average low-pressure cylinder operation efficiency of the multiple units can be improved. By means of the header-pipe-system connection system based on the high and medium pressure cylinder zero output and the operation method, the units can realize further 'machine and boiler decoupling' under the 'few-boiler and multi-machine' operation working condition, the steam turbine generator unit output electric rate under the deep peak regulation operation working condition is further reduced under the normal operation condition of the boilers put into operation, and in addition, a boiler shut-down unit water feeding pump does not work, and more energy is saved in operation.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a connection system and operation method of a female pipe based on zero output of high and medium pressure cylinders. 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 t...

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Problems solved by technology

Since the normal operation of the boiler equipment has a minimum limit on the load of the unit, the minimum load value of the unit under the deep peak-shaving operation condition is limited, which greatly reduces the flexibility of the unit under the deep peak-shaving operation condition; in addition, in the boiler When the equipment needs to be overhauled, fails, the unit operates in two shifts, the unit is in hot standby state, or other boiler equipment needs to be shut down, the supporting steam turbine and generator will also be forced to stop at the same time, which greatly affects the flexible operation of the unit Sex and power generation

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