Power generation method and system based on step conversion of hydrocarbon components of coal

Abstract

The invention discloses a power generation method and system based on step conversion of hydrocarbon components of coal. On the basis of the energy-saving mechanism of gradient utilization of chemical energy of fuel, coal is taken as fuel and is divided into coal for gasification and coal for heating; coal for gasification is subjected to step gasification to obtain coal gasification synthesis gas which is pumped into an IGCC (Integrated Gasification Combined Cycle) power generating unit for power generation; the step gasification process of coal for gasification sequentially comprises three conversion steps, namely a carbonization process, a carbon monoxide production process and a conversion hydrogen production process; oxygen is not involved in reaction in the whole process; coal for gasification is converted into coke oven gas, carbon monoxide and hydrogen step by step to realize step conversion of hydrocarbon components; and the three gases are mixed flexibly to obtain coal gasification synthesis gas with different carbon-hydrogen ratios. Compared with the traditional IGCC power generation system, the coal gasification power generation method and system provided by the invention realize component contra-aperture and gradient utilization; and the generating efficiency is about 6% higher than that of the IGCC system.

Description

technical field [0001] The invention belongs to the field of energy and power, and in particular relates to a coal-based power generation method and system for staged conversion of hydrocarbon components. Background technique [0002] Coal will be the most important source of energy in our country now and in the next few decades. However, the properties of coal and gaseous fuels are different. Coal contains a large amount of harmful substances such as ash, while gaseous fuels are clean energy. It is precisely because of the quality of coal and gas fuels and the difference in energy conversion and utilization methods that the power generation efficiency of coal-fired power plants is 10-15 percentage points lower than that of natural gas combined cycle power plants. [0003] Realizing the efficient and clean utilization of coal is an urgent problem to be solved in our country. The current technology for achieving this in the power sector is the use of integrated gasification...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method and system for coal-based staged conversion of hydrocarbon components to generate electricity, so as to overcome the high investment in eq

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