Power generating system utilizing vaporization latent heat of exhaust fume of natural gas power plant

Abstract

The invention discloses a power generating system utilizing vaporization latent heat of exhaust fume of a natural gas power plant. According to the power generating system, aiming at the oxygen enriched combustion natural gas power plant, a composite-type combined cycling power generating unit is put forward, fume generated after oxygen enriched combustion sequentially passes through a combustiongas turbine GT, a gas power cycling power generating unit A and an organic Rankine cycle power generating unit B, the vaporization latent heat in the fume can be sufficiently recycled, the temperatureof the exhaust fume is decreased to below the normal temperature, CO2 and water in the fume are separated accordingly, and carbon capture is achieved. In the power generating system, gas power cycling is adopted, thus phase change of heat exchange media is avoided, and the heat exchange effect is improved; through organic Rankine cycle, the vaporization latent heat in the fume is sufficiently recovered, and the power generating efficiency of the system is greatly improved; and according to the integrated power generating system, the problems that the steam vaporization latent heat in the low-temperature fume is generally wasted, carbon capture energy consumption is high, and LNG cold energy waste is serious can be effectively solved, meanwhile the power generating efficiency of the systemis improved, and energy saving, environmental friendliness and high efficiency are achieved truly.

Description

technical field [0001] The invention belongs to energy technology and power industry to realize CO 2 The field of zero-emission high-efficiency power generation system, more specifically, relates to a power generation system that utilizes the latent heat of vaporization of exhaust smoke from a natural gas power plant. Background technique [0002] LNG is a liquefied natural gas with a temperature of about -162°C under normal pressure. The gasification process will release about 830kJ / kg of cold energy, which has great utilization value. However, from a global perspective, the utilization rate of LNG cold energy is only about 20%, and the utilization rate of cold energy resources is low. Serious waste. In addition, the greenhouse effect has intensified, and my country is facing severe pressure to reduce emissions. Studies have shown that CO in the atmosphere 2 It is one of the gases that have the greatest impact on the greenhouse effect. Carbon capture and storage (CCS)...

AI Technical Summary

Problems solved by technology

Correspondingly, the present invention optimizes the heat exchange effect, recycles and utilizes the latent heat of vaporization in the flue gas, and significantly improves the power generation efficiency of the combined cycle; at the same time, it realizes zero emission of carbon and has a g

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