Method for catching carbon dioxide by pressurized fluidized bed combustion combined recycled generating system

Abstract

The invention relates to a method for catching carbon dioxide by a pressurized fluidized bed combustion combined recycle generating system, which is a method for catching the carbon dioxide by using CaO generated by calcining limestone or dolomite aiming at a gasification / semi-coking pressurized fluidized combustion combined recycle generating system of a coal pressurized part, coal enters into a pressurized fluidized bed gasification furnace using air as gasifying agent so as to be gasified to generate coal gas and semicoke, the coal gas is combusted after being purified to produce high-temperature fuel to enter a combustion turbine for applying work and generating electricity. Exhaust gas containing CO2 enters into a carbonatation furnace and a calciner double fluidized system, CO2 in the exhaust gas is catched by using circulation carbonatation / calcining reaction of CaO. Steam produced by a coal gas cooler and the double fluidized bed system enters into the turbine system for applying work and generating electricity, therefore, a fuel gas / steam combined recycle generating system catching CO2 is formed. The system has high generating efficiency and low energy consumption, and can realize near-zero exhaust of a plurality of pollutants of SO2, CO2 and the like.

Description

technical field [0001] The present invention relates to a method for capturing carbon dioxide by pressurized fluidized bed combustion combined cycle power generation. Background technique [0002] In recent years, with CO 2 The massive emission of greenhouse gases as the main body has an increasingly serious impact on global warming. There are many CO 2 emission reduction methods, such as O 2 / CO 2 Circulating combustion method, chemical chain combustion method, membrane separation method and MEA method, etc., but the technical economy is the capture of CO 2 important factors to consider when choosing a method. Foreign scholars have proposed that after the coal is fired in a pressurized fluidized bed, the CaO produced by the calcination of calcium-based absorbents such as limestone and dolomite can be directly recycled in the furnace to capture CO. 2 The method has attracted widespread attention from scholars all over the world. Limestone and dolomite are cheap and ab...

AI Technical Summary

Problems solved by technology

The CO 2 The biggest disadvantage of the capture method is that the temperature of the flue gas at the outlet of the pressurized fluidized bed furnace is less than 950°C. No matter how high the temperature is, it will cause coking in the furnace, which greatly limits the working ability of the gas turbine.

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