Method and device based on coal gasification for preparing hydrogen and separating CO2

Abstract

The invention discloses a method and a device based on coal gasification for preparing hydrogen and separating CO2. Coal and water vapor enter a gasification reaction chamber for gasification to obtain H2, CO and CO2. CO is converted to CO2 through a transformation reaction, and CO2 is absorbed by CaO to generate CaCO3. H2 and remnant CO2 enter a gasification bed rising pipe, and CaCO3 and remnant coke enter a calcium oxide regeneration reaction chamber. Pure oxide is introduced to the calcium oxide regeneration reaction chamber, the coke is burned with the oxide, CaCO3 is decomposed to CO2 and CaO, CO2 is separated with the CaO by a separator and is collected, and CaO enters the bottom of the gasification bed rising pipe to be raised by the H2 and the remnant CO2, and the CO2 is absorbed. Parts of the H2 and the CaO return to the bottom of the gasification bed rising pipe through a recirculating pipe. The other part of the H2 and the CaO are separated by the separator to obtain purified H2, and the separated CaO returns to the gasification reaction chamber for cyclic utilization.

Description

technical field [0001] The invention relates to a method and device for coal gasification, in particular to a method for producing hydrogen and separating CO by gasification of coal and steam. 2 methods and devices. Background technique [0002] One of the sustainable development strategies of energy utilization is to realize the efficient and clean utilization of energy. As a clean energy source, hydrogen is accompanied by water in the process of energy conversion, which can truly achieve zero emission of pollutants, and can be directly burned for power generation, heat supply, or used as vehicle fuel. As the global "oil security", "greenhouse gas emission greenhouse effect" and "environmental protection" issues become more and more serious, reduce the dependence on oil, strengthen the capture and storage of carbon dioxide, and reduce the impact on the environment. In the future In the sustainable energy system, hydrogen is expected to become an important energy carrier a...

AI Technical Summary

Problems solved by technology

However, the conversion of coal to hydrogen energy will emit a large amount of CO 2 , the resulting greenhouse effect has a serious negative impact on the ecological environment, and the CO emitted during the coal-based hydrogen production process 2 The amount is quite huge, and the advantages of hydrogen as a clean energy source will disappear

Images