Deep peak shaving system and method for compressed air energy storage coupled thermal power generating unit

Abstract

The invention discloses a deep peak shaving system and method for a compressed air energy storage coupled thermal power generating unit. A turbine is connected with a first generator, the first generator is connected with a compressor, and the compressor is connected with a heat inlet of a condenser. A heat outlet of the condenser is divided into two paths, one path is connected with an air storage tank, and the other path is connected with an SCR ammonia spraying materialization system. An outlet of the air storage tank is divided into two paths, one path is connected with the SCR ammonia spraying materialization system, and the other path is connected with a cold inlet of a heater. A cold outlet of the heater is connected with an expansion machine, and the expansion machine is connected with a second generator. A heat inlet of the heater communicates with a tail flue of a boiler, and a connection point is located between a high-temperature superheater and a low-temperature superheater. The heat inlet of the heater is provided with a smoke extraction device. A heat outlet of the heater communicates with the tail flue of the boiler, and a connection point is located between an economizer and an SCR denitration device. The deep peak shaving system and method can meet the requirement for flexible and deep peak shaving of a thermal power plant unit, and have the characteristic of high economical efficiency.

Description

Technical field [0001] The invention belongs to the depth peak and compressed air energy storage area of ​​thermal power plants, involving a depth peak system and method for compressed air energy storage coupling thermal electrical units. Background technique [0002] The new energy power is grided by the base energy power mainly based on the power generation unit, and is fully involved in the depth peak. At present, the unit length of the depth peak is deviated from the design value, resulting in a unit safety and economic decline. From the practice of adopting techniques and transformation, the modified unit has a low-load combustion of the boiler and the safety problem of the water-driven circulation, and the total load of the denitrifier and the low load cooling problem of turbine, long-term low load and Flexibility in the control system, the problem of equipment operating cycle and life attenuation, and heat-dissipating, and heat generating units. [0003] At present, domest...

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Problems solved by technology

[0003] At present, domestic and foreign researches on the flexibility and deep peak regulation of thermal power units are very active. At the same time, the flexibility technology of thermal power units can be roughly divided into two categories: one is the low-load stable combustion on the boiler side and the removal technology of the low-pressure cylinder on the steam turbine side (boiler and steam turbine Long-term extremely low-load operation and frequent switching between high and low loads, poor equipment safety and economy); second, heat storage technology for thermal power units coupled with hot water tanks and electric-grade boilers (only applicable to winter heating periods, and using high-grade electric energy heating water, poor economy)

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