Efficient heat recovery and waste strong brine treatment integrated system and method

Abstract

The invention discloses an efficient heat recovery and waste strong brine treatment integrated system and method. High-concentration brine is jetted into a hydrothermal conversion zone from an atomizing nozzle, and make direct contact with 700-1100 DEG C mixed fluid consisting of agglomerated crude particles and crude synthesis gas to generate a hydrothermal conversion reaction; heavy metals, soluble salts such as sodium chloride and miscellaneous salt components such as sodium sulfate in the high-concentration effluent brine react with molten slag and fly ash particles in crude synthesis gasunder a high-temperature condition and are converted into mineral species which are solidified into two or more of wollastonite, nepheline, sodalite, soda-lime type aluminosilicate feldspar and soda-lime stone without leaching environmental risks, have stable physicochemical properties, have no dissolution risk under natural conditions and do not cause secondary pollution to the environment, especially underground water; organic carbon in the high-concentration waste brine is converted into CO and H2, and water absorbs sensible heat and then is converted into high-quality steam with the temperature of 400-500 DEG C and the pressure of 5.0-10.0 MPa for synthesis gas conversion.

Description

technical field [0001] The invention relates to an efficient and clean conversion and utilization of carbonaceous materials into coal chemical industry, coal gasification technology upgrade, and synthesis gas purification technology, and specifically relates to an integrated system and method for efficient heat recovery and waste concentrated brine treatment. Background technique [0002] The gasification technology of carbon-rich materials such as coal, heavy oil, petroleum coke, oil sands, and asphalt is not only an important way for the clean and efficient conversion and utilization of inferior carbon-rich materials, but also the gasification of the above-mentioned carbon-rich materials to produce synthesis gas, which is then sent downstream Leading devices for extending the large-scale hydrogen production, synthesizing low-carbon olefins, ethylene glycol, and producing high-end energy and chemical products through the F-T route, etc. Gasification raw materials and gasifi...

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Problems solved by technology

Among them, the quenching process is the most widely used. However, the syngas quenching process has low thermal efficiency of the system and low-grade steam produced. At the same time, complex black and gray water treatment systems, carbon washing towers, concentrated salt wastewater treatment systems, etc. need to be built. , there are disadvantages such as long process, low comprehensive energy efficiency and a large amount of solid hazardous waste salt

Although the conventional waste boiler process partly solves the problems encountered in the chilling process, because the high-temperature crude syngas usually carries a large amount of unconverted carbon-containing particles with irregular surfaces and fine particles such as fly ash and slag, and contains A large number of high-temperature corrosive gases such as H2S, HCN, etc., these components will have an important impact on the radiation, convective heat transfer characteristics of the crude gas and the contamination characteristics of the ash, resulting in erosion wear, high temperature corrosion, hanging Problems such as slag, scarring, clogging, and deterioration of heat transfer efficiency have become the biggest technical bottlenecks faced by the conventional waste boiler process to achieve safe, stable and long-term operation

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