Material grading-preheating and over-temperature protection system and method for supercritical water gasification and hydrogen production

Abstract

A material grading-preheating and over-temperature protection system for supercritical water gasification and hydrogen production comprises a material gradient preheating unit, which comprises a blending storage tank, a slurry high pressure delivery pump, a slurry pre-heater, a flow distributor, and a self-heating gasification furnace; a separation unit, which comprises a temperature regulator, apressure regulator, a high-pressure gas separator and a high-pressure solid-liquid separator; and an over-temperature protection unit, which comprises a flow regulator and a temperature regulator. Gasification raw materials and hot recycled water are mixed and preheated in the blending storage tank; then the mixture enters the slurry pre-heater, is preheated and heated, then enters the self-heating gasification furnace, and is heated by the heat released by reactions carried out in the upper part of the self-heating gasification furnace; and three-stage gradient preheating is completed. The gasification product from the slurry pre-heater is subjected to temperature adjustment and pressure adjustment, then gas separation and solid-liquid separation are performed, the liquid phase is returned to the raw material blending step, and after temperature adjustment, medium-temperature cooling water is introduced into the cooling wall of a self-heating gasification furnace to prevent over-temperature. The system and method can improve the gasification rate and hydrogen yield, self-heating balance of the system is realized; safe, stable, and efficient operation is guaranteed; the energy consumption and cost are reduced; and zero emission of pollutants is realized.

Description

technical field [0001] The invention belongs to the technical fields of energy and chemical industry, and in particular relates to a material classification preheating and over-temperature protection system and method for supercritical water gasification hydrogen production. Background technique [0002] The pattern that my country's primary energy is dominated by coal will be difficult to change for a long time in the future. Coal resources have large reserves, good availability, and low price, but the environmental pollution and ecological damage caused by the production and utilization process are becoming more and more serious, and even endanger human health and sustainable development, so it has received serious attention from all walks of life. Hydrogen has the characteristics of cleanness, high calorific value, storage and transportation, and is an excellent energy carrier. But very little concentrated natural hydrogen exists on Earth, and large-scale hydrogen produc...

AI Technical Summary

Problems solved by technology

However, the supercritical water gasification hydrogen production system under this condition still has the following two problems: first, the reaction conditions are ultra-high temperature and high pressure conditions, and no safe and suitable pipeline and equipment materials have been found; second, supercritical water The gasification hydrogen production reaction requires a large amount of heat to preheat the gasification raw materials to the reaction temperature, but because it is an endothermic reaction, it cannot achieve self-heating balance, and the power consumption of the system operation is large; Constraints to Large-Scale Technology Development

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