Energy utilization system and method of using carbon-based energy to perform supercritical water gasification to produce hydrogen and CO2

Abstract

The invention discloses an energy utilization system and method of using carbon-based energy to perform supercritical water gasification to produce hydrogen and CO2. The method comprises the followingsteps: (1) a main reaction process: using the heat of the reaction product of the supercritical water gasification for producing hydrogen to preheat materials; separating to obtain CO2 and a liquid-phase product, regulating the temperature and the pressure of the liquid-phase product, performing a supercritical water oxidation reaction, preheating the liquid-phase product subjected to temperatureand pressure regulation by the heat of the product of the supercritical water oxidation reaction, reducing the pressure, performing three-phase separation, separating to obtain CO2 and a liquid-phaseproduct, and returning the liquid-phase product to prepare coal slurry; (2) energization and carbon-fixing process, utilizing CO2 obtained in the main reaction process to carry out a microalgae carbon-fixing reaction to produce biological crude oil; (3) oxidant supplying process: supplying oxygen to the supercritical water gasification reaction and the supercritical water oxidation reaction; and(4) material supplying process: preparing coal slurry, and supplying materials to the main reaction process. The supercritical hydrothermal combustion technology, the supercritical water gasificationtechnology and the supercritical water oxidation technology are coupled into a whole, and high-value clean conversion and utilization of coal in the whole process are achieved.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient conversion and utilization of energy and carbon fixation, in particular to a carbon-based energy supercritical water gasification hydrogen production and CO 2 Energy utilization system and method. Background technique [0002] As the most potential new energy source, hydrogen has the advantages of abundant sources, light weight, high calorific value, no carbon emissions, the product of combustion is water, and can be directly used in hydrogen fuel cells. As society pays more and more attention to environmental quality, and hydrogen can be widely used in petroleum, chemical industry, metallurgy, medicine, aerospace and other industrial fields, it has become a research hotspot in various countries in recent years. In 2018, China's coal accounted for nearly 60% of primary energy consumption. Realizing the clean utilization of coal is of great significance for energy conservation and emis...

AI Technical Summary

Problems solved by technology

In addition, a large amount of CO will be produced during the hydrogen production process of coal SCWG 2 , its direct emissions will bring many problems such as "greenhouse effect"

How to improve hydrogen production efficiency, realize the reuse of residual slurry with high energy utilization value and CO 2 The low-cost recycling of low-cost has become the main obstacle restricting the development of SCWG process

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