High-and-low-temperature supercritical carbon dioxide waste heat utilization system

Abstract

The invention provides a high-and-low-temperature supercritical carbon dioxide waste heat utilization system which comprises a high-temperature turbine, a low-temperature turbine, a waste heat recoverer, a high-temperature reheater, a low-temperature reheater, a condenser and a gas compressor. A gas inlet of the high-temperature turbine is sequentially connected with the waste heat recoverer, the high-temperature reheater, the gas compressor and the condenser. A gas inlet of the condenser is further sequentially connected with a gas outlet of the high-temperature reheater and a gas outlet of the high-temperature turbine, so that a high-temperature turbine circulation loop is formed. A gas inlet of the low-temperature turbine is sequentially connected with the waste heat recoverer, the low-temperature reheater, the gas compressor and the condenser. A gas inlet of the condenser is further sequentially connected with a gas outlet of the low-temperature reheater and a gas outlet of the low-temperature turbine, so that a low-temperature turbine circulation loop is formed. According to the high-and-low-temperature supercritical carbon dioxide waste heat utilization system, exhausted high-temperature gas of a gas turbine or industrial waste heat / lost heat serves as a heat source, high-grade heat energy is utilized efficiently, and low-grade heat energy is utilized, so that energy sources are utilized sufficiently, and the overall circulation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of gas turbine combined cycle system power generation and industrial waste heat / waste heat power generation technology, in particular to a high and low temperature supercritical carbon dioxide waste heat utilization system. Background technique [0002] As we all know, the fossil energy on the earth is very limited. Since the industrial revolution, fossil energy such as oil, coal, and natural gas has been vigorously exploited and used. The remaining fossil energy that has been proven on the earth can only be used by human beings for more than a hundred years. Human civilization cannot be terminated by the depletion of fossil energy, and researchers from various countries are actively exploring ways to solve the energy shortage. In summary, it can be divided into two categories: one is to develop new energy, mainly including nuclear energy and renewable energy, such as wind energy, solar energy, hydropower, ...

AI Technical Summary

Problems solved by technology

However, the T2 output of this system must match the power consumption of C1, and the output capacity of T2 cannot be fully utilized, resulting in waste of energy; on the other hand, in the single-cycle and double-cycle modes, the temperature The difference is very large. If the inlet steam temperature of the double-cycle mode is its design condition, it will inevitably cause a significant drop in turbine efficiency under the single-cycle mode.

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