Supercritical water gasification hydrogen production and slurry supercritical hydrothermal combustion coupled system and process

Abstract

The invention discloses a supercritical water gasification hydrogen production and slurry supercritical hydrothermal combustion coupled system and process. Carbon-based energy is adopted, coal slurryenters a high-pressure pre-heater after being boosted and exchanges heat with supercritical water flowing out of the bottom of a supercritical water gasification reactor; the preheated coal slurry enters a supercritical water gasification reactor and is gasified; gasification products flowing out of an outlet in the bottom of the supercritical water gasification reactor enter a separator through the hot fluid side of the high-pressure pre-heater and are separated, and separated slag slurry sequentially passes through a mass component recovery unit, a high-pressure slurry pump and the cold fluid side of a high-pressure heat regenerator, then enters the supercritical hydrothermal combustion reactor and is subjected to a supercritical hydrothermal combustion reaction. Carbon dioxide obtainedby the separator and a three-phase separator is delivered to a microalgae photosynthetic reactor for microalgae cultivation; the cultured microalgae is introduced a centrifugal separator, concentratedalgae slurry discharged from the bottom of the centrifugal separator is introduced into a coal slurry preparation unit to supplement water and / or a hydrothermal liquefaction reactor to produce biological crude oil, and gases such as carbon dioxide obtained by separation is returned to the microalgae photosynthetic reactor through a top outlet.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient conversion and utilization of carbon-based energy, and in particular relates to a coupling system and process of supercritical water gasification hydrogen production and slurry supercritical hydrothermal combustion. 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 con...

AI Technical Summary

Problems solved by technology

However, limited by the temperature resistance limit of the high-pressure reactor and preheater materials, the current SCWG process is mostly carried out at a temperature of 400-600 ° C, which seriously affects the conversion of coal to H2 in the SCWG process, and the hydrogen production rate is limited; The low gasification temperature results in high carbon residue content after gasification, and the residual slurry after gas separation needs to be treated harmlessly and has high energy utilization value

In addition, a large amount of CO will be produced during the hydrogen production process of coal SCWG 2 , its direct emission will bring many problems such as "greenhouse effect", how to improve hydrogen efficiency, realize the reuse of carbon-containing slurry with high energy utilization value and CO 2 The low-cost reuse of low-cost has become the main obstacle restricting the development of SCWG process

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