Phase-change-free heat-exchange integrated heating raw material coal water slurry gasification system and process

Abstract

The invention discloses a coal water slurry gasification system. The coal water slurry gasification system comprises a gasification furnace, a washing tower, a settling tank, a grey water tank, a coalwater slurry / black water heat exchanger and a grey water / black water heat exchanger which are sequentially arranged and connected through pipelines and is characterized in that the black water inputend of the coal water slurry / black water heat exchanger is connected with the black water output ends of the gasification furnace and the washing tower; the black water input end of the grey water / black water heat exchanger is connected with the black water output end of the coal water slurry / black water heat exchanger; the black water output end of the grey water / black water heat exchanger is connected with the black water input end of the settling tank; the grey water input end of the grey water / black water heat exchanger is connected with the grey water output end of the grey water tank; the grey water output end of the grey water / black water heat exchanger is connected with the grey water input end of the washing tower. The coal water slurry gasification system has the advantages thathigh-temperature black water is subjected to two heat exchanger heat exchanges to heat coal water slurry and grey water, phase change is avoided, low-grade heat energy can be recycled, energy recycling efficiency is increased, a complex flash system is not needed, and equipment investment cost is lowered.

Description

technical field [0001] The invention relates to a coal gasification process, in particular to an integrated heating raw material coal-water slurry gasification system and process without phase change heat exchange. Background technique [0002] The coal gasification process is one of the main ways for industrial production of synthesis gas products mainly composed of hydrogen and / or carbon monoxide. It can convert solid coal into gaseous synthesis gas through the gasification process, and is widely used in the production of synthetic ammonia, urea, Methanol, acetic acid, petroleum refining, coal-to-oil, synthetic natural gas and many other basic chemicals and refining fields play an important role in the national economy. Among them, entrained bed gasification technology occupies a leading position in the industry due to its environmental protection, high efficiency and technological advancement. In the entrained bed gasification technology, the coal water slurry gasificati...

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Problems solved by technology

[0006] What the present invention intends to solve is that in the existing coal gasification process, the investment in flashing equipment is high, multiple phase transitions occur during heat recovery and utilization, resulting in wasted latent heat that cannot be recycled, and low-grade steam heat cannot be used; and the heat exchanger is easy to Technical problems of fouling and clogging

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