Energy gradient utilization system and method for supercritical water gasification hydrogen production process

Abstract

The invention discloses an energy gradient utilization system and method for a supercritical water gasification hydrogen production process. The system comprises a supercritical hydrothermal combustion reactor and a supercritical water gasification reactor. A bottom outlet of the supercritical water gasification reactor is connected to an inlet of a gas-phase separator through a hot fluid side ofa first preheater, a hot fluid side of a temperature regulator and a pressure regulator. A bottom outlet of the gas-phase separator is connected to a top inlet of the supercritical hydrothermal combustion reactor through a hot fluid side of a first heat regenerator, a booster pump and a cold fluid side of a second preheater. The bottom center of the supercritical hydrothermal combustion reactor iscommunicated with the supercritical water gasification reactor through a flow guide piece. An outlet of a water feeding pump and a cold fluid side outlet of the first heat regenerator are both divided into two paths, provide cold fluid respectively and finally send the cold fluid to a first inlet of a mixer. An outlet of the mixer is connected with an efficient cooling jacket, an outlet of the efficient cooling jacket is connected with an inlet of a steam turbine through a temperature and pressure regulator, and an outlet of the steam turbine is connected with an inlet of the water feeding pump. According to the invention, comprehensive gradient utilization of pressure energy and heat energy in the coal gasification hydrogen production process is achieved.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient conversion and utilization of energy and energy conservation and environmental protection, and in particular relates to an energy cascade utilization system and method for a supercritical water gasification hydrogen production process. Background technique [0002] my country is a country that is rich in coal but lacking in oil and gas. Among the world's proven energy reserves, my country's coal accounts for 15% of the world's total, oil accounts for 2.7%, and natural gas accounts for 0.9%. This energy structure determines my country's A country that consumes coal as its main energy source. Hydrogen is currently a chemical raw material used in a huge amount in the petrochemical field, and is widely used in the production of synthetic ammonia, oil, methanol and hydrogenation reactions in petroleum refining processes. As a clean, efficient, storable and renewable energy, hydrogen energy ...

AI Technical Summary

Problems solved by technology

Higher reaction temperature helps coal to H 2 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, the hydrogen generation efficiency is low, and a considerable part of the energy in coal can be Concentrate in the solid phase product (char residue) after the reaction

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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