High-temperature supercritical water gasification carbon-based energy hydrogen production system and method

Abstract

The invention discloses a high-temperature supercritical water gasification carbon-based energy hydrogen production system and method, and belongs to the field of clean and efficient conversion and utilization of energy. After solid-liquid-gas separation of a gasified product, carbon residues in a solid-liquid phase are reused for supercritical hydrothermal combustion in a supercritical hydrothermal combustion reactor, and chemical energy of carbon-based energy sources such as coal is thoroughly utilized. The generated high temperature further increases the temperature of the supercritical fluid, and the supercritical fluid is directly mixed and preheated with coal slurry to be gasified in a supercritical water gasifier in a molecular contact manner, so that the temperature resistance limit of the structural alloy of indirect heat exchange high-pressure equipment is broken through, the supercritical water gasification reaction at higher temperature is realized, and the hydrogen production efficiency is maximized. According to the invention, heat generated in the hydrogen production process is fully utilized, and the energy consumption is reduced. By coupling supercritical hydrothermal combustion and supercritical water gasification and combining various heat energy recycling measures such as a heat regenerator, chemical energy of carbon-based energy sources such as coal is directly and efficiently converted into hydrogen energy, meanwhile, the environmental protection requirement is met, and harmful gas such as nitric oxide is not discharged.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient conversion and utilization of energy, and in particular relates to a system and method for producing hydrogen from carbon-based energy by high-temperature supercritical water gasification. Background technique [0002] Hydrogen energy is regarded as the most promising clean energy in the 21st century. In the context of coping with global warming and energy transition, hydrogen energy has been included in the national energy strategy deployment of many countries because of its many advantages such as diverse sources, clean and low-carbon, flexible and efficient, and rich application scenarios. Hydrogen is a secondary energy source. Free hydrogen does not exist in nature, but exists in the form of compounds such as hydrocarbons, water, and biomass. Therefore, although it has abundant reserves, it is almost impossible to obtain it directly from nature. Today's hydrogen production, hydrog...

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Problems solved by technology

However, limited by the temperature resistance limit of the high-pressure reactor and preheater materials, the current supercritical water gasification process is mostly carried out at a temperature of 400-500°C, and the hydrogen production efficiency is low. A considerable part of the energy in the coal can be concentrated in the reaction in the solid phase product

Secondly, the low gasification temperature will also lead to the incomplete degradation of polycyclic aromatic hydrocarbons in the material, and further treatment of the reaction product is required, which increases the system flow and equipment cost

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