Multi-stage energy recovery device and process for coal water slurry gasified black water

Abstract

The invention belongs to a multi-stage energy recovery device and process for coal water slurry gasified black water. The device comprises a gasification furnace with a black water discharge port andan evaporation hot water tower, a multi-stage energy recovery unit is arranged between the black water discharge port of the gasification furnace and the evaporation hot water tower, and the multi-stage energy recovery unit comprises at least two turbine units used for recovering black water potential energy and heat recovery units arranged between the adjacent turbine units and used for recovering black water heat energy. The device has the characteristics that the structure is simple, the design is reasonable, the problems of serious erosion corrosion, black water energy waste and the like of the black water pressure reducing valve can be effectively solved, recycled pressure potential energy can be used for a production system, recycled heat energy is used for power generation, and coalchemical industry waste energy is effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry gasification black water energy recovery, and in particular relates to a multi-stage energy recovery device and recovery process for coal-water slurry gasification black water. Background technique [0002] The high-pressure coal-water slurry gasification furnace adopts a 6.5Mpa gasification and pressurization process. After the raw coal is gasified, it is cooled by a chilling process. The gasification furnace discharges high-temperature and high-pressure gasification black water. Flash and vacuum flash processing. The defects in the existing technology are: 1. The high-pressure flash evaporation is generally about 0.8Mpa, and the gasified black water is generally about 6.5Mpa. The gasified black water needs to be decompressed through the black water pressure reducing valve. 2. The temperature of gasified black water is generally 230°C-240°C, and the heat energy of black water is lost i...

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Problems solved by technology

The defects in the existing technology are: 1. The high-pressure flash evaporation is generally about 0.8Mpa, and the gasified black water is generally about 6.5Mpa. The gasified black water needs to be decompressed through the black water pressure reducing valve. 2. The temperature of gasified black water is generally 230°C-240°C, and the heat energy of black water is lost in the process of black water decompression and high-pressure flash evaporation, which cannot be effectively utilized; some In order to effectively utilize the above-mentioned energy, enterprises often adopt the method of recovering the pressure potential energy of black water. In the process of potential energy recovery, the pressure of black water decreases, the gasification is serious, and the flow rate increases, resulting in limited recovery effect of pressure potential energy.

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