Low-load operation system with one furnace and two machines

Abstract

The invention discloses a low-load operation system with one furnace and two machines. The low-load operation system comprises two unit system units. Wherein superheated steam of a boiler communicates to steam inlets of high-pressure cylinders of a first steam turbine and a second steam turbine through a main steam pipeline, and the steam flow is controlled through a regulating valve and a shut-off valve. Exhaust steam of the high-pressure cylinder of the first steam turbine enters an intermediate-pressure cylinder through reheating, and exhaust steam of the high-pressure cylinder of the second steam turbine directly enters the intermediate-pressure cylinder. The header system reheating system of the low-load unit is achieved through a simple structure, good economical efficiency and development potential are achieved, and the long-time low-load operation requirement of the thermal power unit under large development of new energy electric power can be effectively met.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a low-load operation system with one furnace and two machines. Background technique [0002] At present, the scale of wind power and photovoltaic power generation is gradually expanding. For thermal power generation, it is more and more important to ensure lower load operation capacity to compensate for wind power photovoltaic power generation that cannot generate stable power. The increase in new energy power generation will have a great impact on existing thermal power units. In order to adapt to more and more new energy power, existing thermal power units need to undergo flexible transformation to enhance deep peak-shaving capabilities. At present, the flexible peak shaving transformation generally adopts the thermoelectric decoupling method, which has certain limitations. First, the output of the boiler has not been reduced, that is to say, the amount of co...

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Problems solved by technology

[0003] For the existing thermal power generation system, because the boiler cannot operate at low load for a long time, and the current domestic large-capacity power plant unit adopts the unit system because of the steam intermediate reheating system, that is, each boiler only supplies power to a steam turbine that it cooperates with. Then the steam turbine drives the generator to form an independent power generation unit. When the unit is in normal operation, the steam and plant power required by this unit are only taken from this unit

Therefore, the current load of the reheat unit cannot be lower than the minimum load of the boiler

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