Partially-chilled dry coal powder or coal water slurry gasification system and gasification process

Abstract

The invention discloses a partially-chilled dry coal powder or coal water slurry gasification system. The partially-chilled dry coal powder or coal water slurry gasification system is characterized by comprising a gasifier, a heat recovery apparatus, a dust removal device, a washing component and a grey water treating unit which are sequentially connected through pipelines, wherein the gasifier comprises a hearth, a chilling apparatus coaxially arranged at the top part of the hearth and a synthetic gas delivery part connected with the output end of the chilling apparatus; the hearth is provided with at least one nozzle; the synthetic gas delivery part is provided with an exhaust port; the heat recovery apparatus is connected with the exhaust port of the synthetic gas delivery part, and the output end of the heat recovery apparatus is connected with the input end of the dust removal device; the washing component comprises a washing tower; the output end of the dust removal device is connected with the input end of the washing tower through a pipeline; an output port of the washing tower is used for outputting crude synthetic gas, and an outlet at the bottom of the washing tower is connected with an inlet of the grey water treating unit through a pipeline; and the grey water treating unit is used for outputting waste water. The invention also discloses a gasification method. The invention has the advantages of improved gasification efficiency and high energy utilization rate.

Description

Technical field [0001] The invention relates to a partially quenched dry coal powder or coal water slurry gasification system and its gasification process. Background technique [0002] In existing coal-water slurry gasifiers, the quench cooling method of high-temperature syngas generally adopts a downward complete quench process. The process is relatively simple and mature, the structure is relatively simple, and the cost is low. It is suitable for certain chemical processes. , but the disadvantages of this process are that the cold gas efficiency is low, the oxygen consumption is large, and the subsequent "black water" treatment is difficult, which affects long-term operation. [0003] The main features of the existing dry powder gasification furnace are dry powder feeding, water-cooled wall lining, and the use of cooled gas to return to the furnace for quenching the hot gas. However, the gas compressor used for return to the furnace for quenching has a large power consump...

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Problems solved by technology

[0002] In existing coal-water slurry gasifiers, the quenching and cooling method of high-temperature syngas generally adopts the downward complete quenching process. The process is relatively simple and mature, the structure is relatively simple, and the cost is relatively low, which is more suitable for some chemical processes. , but the disadvantage of this process is that the cold gas efficiency is low, the oxygen consumption is large, and the subsequent "black water" treatment is difficult, which affects the long-term operation

[0003] The existing dry powder gasification furnace is mainly characterized by dry powder feeding, water-cooled wall lining, and the use of cooled gas to return to the furnace to quench the hot gas. However, the gas compressor for the return to the furnace for quenching consumes a lot of power, and the operation is unstable, which is not conducive to the equipment. long-term operation of

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