Coal-fired power generating system and method with carbon capture device

Abstract

The invention provides a coal-fired power generating system with a carbon capture device. The coal-fired power generating system comprises a supercritical carbon dioxide circulation subsystem and a carbon capture subsystem. The supercritical carbon dioxide circulation subsystem comprises a low-pressure-ratio supercritical carbon dioxide circuit and a high-pressure-ratio supercritical carbon dioxide circuit. The carbon capture subsystem comprises a liquefied air cooling circuit, a liquefied air device waste heat recovery circuit and a sublimation carbon capture circuit. The invention further provides a coal-fired power generating method with the carbon capture device. A coal-fired boiler supplies heat to the supercritical carbon dioxide circulation subsystem for power generation, and flue gas exhausted by the coal-fired boiler is decarbonized through the carbon capture subsystem. Redundant heat and cold of the carbon capture subsystem are supplied to the supercritical carbon dioxide circulation subsystem, and therefore the power generating efficiency of the coal-fired power generating system and method is improved. An air liquefying device can increase loads during a power generating valley and reduce the loads during a power generating peak, and therefore the energy consumption cost is reduced. By means of the system and method, efficient zero-carbon-emission power generation of coal of a coal-fired power generating plant with carbon capture can be achieved.

Description

technical field [0001] The invention relates to a coal-fired power generation system and method with a carbon capture device, belonging to the technical field of clean coal-fired power generation. Background technique [0002] On October 8, 2018, the United Nations Intergovernmental Panel on Climate Change (IPCC) released the "Special Report on Global Warming of 1.5°C" in Incheon, South Korea. The report shows that if climate warming continues at the current rate, global temperatures are expected to rise by 1.5 degrees Celsius above pre-industrial levels between 2030 and 2052. Keeping global warming within 1.5 degrees Celsius will bring more benefits to humans and ecosystems. Relevant experts call on all countries to take action and work hard to keep the temperature rise within 1.5 degrees Celsius. In this context, it is imperative to control greenhouse gas emissions, and carbon dioxide, as the largest contributor to the greenhouse effect, bears the brunt of its emission re...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: how to improve the economical efficiency of a coal-fired power plant with a carbon capture device, realize high efficiency and low carbon emission of coal, and even zero carbon emission utilization

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