Subcritical water preparation process and generation device thereof

Abstract

The invention provides a subcritical water preparation process and a subcritical water generation device. The subcritical water preparation process comprises a gas-water mixing system and a gas-water separation system, the gas-water mixing system is used for fully and uniformly mixing and exchanging heat of the high-pressure superheated steam and the process water, so that a gas-water mixture of subcritical water and saturated steam is generated from a gas-water mixed fluid consisting of the high-pressure superheated steam and the process water; the gas-water separation system is used for separating subcritical water and saturated steam in the gas-water mixture, the subcritical water is directly applied, and the saturated steam is further condensed into the subcritical water to be applied. The high-pressure superheated steam is used as a heat source to directly heat the process water, and finally, the high-pressure superheated steam and the process water are converted into subcritical water to be fully utilized, so that the utilization rate of raw materials is high; no additional heating device is needed, and heat energy utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of subcritical water preparation, in particular to a subcritical water preparation process and a generating device thereof. Background technique [0002] Biomass, as a kind of green renewable energy, has the attributes of large output, wide distribution and renewable. It is already the fourth largest energy source in the world. Promoting the development and utilization of biomass energy plays an important role in the sustainable development of the global economy and society. meaning. Biomass hydrothermal carbonization upgrading technology is a key technology to solve the application of biomass energy with high moisture content, high alkali metal content and low calorific value in steel production. Hydrothermal carbonization technology uses subcritical water as the reaction medium to complete the carbonization reaction process at a relatively low temperature (180-350°C). The solid product obtained when bioma...

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Problems solved by technology

At present, the commonly used heating methods for preparing subcritical water are electric heating and heat conduction oil heating. The patent application number CN201910199950.4 discloses a subcritical water preparation device, including: a pressure vessel, multiple heating units, and multiple temperature detection units. and a pressure detection unit; multiple heating units are used to heat water in different positions in the pressure vessel; the disadvantages of this device are that the heating process is slow, the heating energy consumption is high and the production rate of subcritical water is slow, which is difficult to meet Application of Biomass Hydrothermal Carbonization Engineering

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