Coal water slurry gasification system and coal water slurry gasification process based on phase-change-free heat exchange and black water heating

Abstract

The invention discloses a coal water slurry gasification system. The coal water slurry gasification system comprises a gasification furnace, a washing tower, an ash water tank, a sedimentation tank, afirst coal water slurry / black water heat exchanger and a second coal water slurry / black water heat exchanger; the gasification furnace, the washing tower, the ash water tank and the sedimentation tank are sequentially arranged and connected through pipelines; the black water input end of the first 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 second coal water slurry / black water heat exchanger is connected with the black water output end of the first coal water slurry / black water heat exchanger; the black water output end of the second coal water slurry / black water heat exchanger is connected with the black water input end of the sedimentation tank. The coal water slurry gasification system has the advantages that high-temperature black water from the gasification furnace and the washing tower preheats and heats coal water slurry through the second coal water slurry / black water heat exchanger and the first coal water slurry / black water heat exchanger for two-time heat exchange, no phase change exists, low-grade heat energy can be recovered, and the energy recovery efficiency is greatly improved; complex flashing systems are omitted, and the equipment investment cost is reduced.

Description

technical field [0001] The invention relates to a coal gasification process, in particular to a black water heating 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 gasification process is...

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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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