Hybrid power circulating system, operating method of hybrid power circulating system and power generation system

Abstract

The invention discloses a hybrid power circulating system, an operating method of the hybrid power circulating system and a power generation system. The hybrid power circulating system comprises a powder subsystem and an absorption type hot-pump subsystem. The power subsystem comprises a steam-liquid separator, a condensate working medium booster pump, a high-temperature steam generator and a steam power device which are sequentially connected. The absorption type hot-pump subsystem comprises an absorber, a generator and a condenser. Exhaust steam output by the steam power device is used as a generation heat medium, and the generation heat medium is input into a generation heat exchanger; exhaust steam output by an exhaust steam pipeline is also used as working medium steam, the working medium steam is directly guided into the absorber and is absorbed by an absorption solution, heat is released, and heat absorption is increased by the released heat; and a generation heat medium which flows through the generation heat exchanger and a condensate working medium which is generated in the condenser are jointly used as an absorption heat medium and conveyed to an absorption heat exchanger. The absorption heat medium flowing through the absorption heat exchanger is input into the steam-liquid separator from the middle of the steam-liquid separator. According to the hybrid power circulating system, an absorption type heat pump system is organically combined with a Rankine cycle, and the heat energy utilization efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of thermal energy engineering, in particular to a composite power cycle system, an operation method thereof, and a power generation system. Background technique [0002] A steam power plant is a device that converts the thermal energy of steam into mechanical energy. The working process of steam turbine power generation based on the Rankine cycle is that high temperature and high pressure fresh steam is used as the inlet steam to be introduced into the first stage of the steam turbine to drive the steam turbine through expansion and work, and then the steam turbine drives the generator to generate electricity. The low-pressure exhaust steam is discharged from the final stage of the steam turbine, and the exhaust steam enters the condenser to release the heat of condensation to the condensing heat medium and form a condensing working fluid. After the condensing working fluid booster pump is sent to a high-pressure...

AI Technical Summary

Problems solved by technology

As mentioned above, a large amount of exhaust steam condensation heat is discharged to the low-temperature heat source through the condenser without being effectively utilized, resulting in a significant decrease in the thermal efficiency of the Rankine cycle, that is, the power generation efficiency

[0003] In order to improve power generation efficiency, in addition to increasing the parameters of fresh steam as much as possible, the steam turbine design usually expands the steam to the lowest possible temperature and pressure (exhaust steam temperature 40°C, exhaust steam pressure below 7kPa), which not only leads to The low-pressure section of the steam turbine works under negative pressure, which also leads to an increase in the number of steam turbine stages and an increase in the size of cylinders, blades, exhaust pipes, and condensers, thereby increasing the cost of the power generation system

[0004] On the other hand, due to the lack of energy storage technology with high energy storage density and good economic efficiency, when using solar heat or intermittent industrial waste heat to generate power, it is difficult to generate electricity due to large fluctuations in power generation load. High-efficiency power generation, and the power generated is often difficult to be absorbed by the grid

In addition, when the solar radiation intensity is too low in the morning, evening and cloudy days, the steam generated by the solar collector cannot reach the steam quantity and temperature required for the minimum output power of the steam turbine, and this part of the heat energy cannot be used for power generation. and wasted in vain

Images