Pressure reducing device for coal gasification black water treatment system

The utility model belongs to the technical field of black water treatment, and particularly relates to a pressure reducing device for a coal gasification black water treatment system, which is characterized in that a high-pressure black water discharge pipe is connected with an inlet of an angle valve 1 through a flange, an outlet of the angle valve 1 is connected with an inlet of a buffer pipe 2 through a flange, and the buffer pipe 2 is connected with a flash tower 4 through a liquid inlet pipe 3; the height of the buffer pipe 2 is 80-100 cm, the diameter of the buffer pipe 2 is 60-80 cm, and the problems that in an existing black water treatment technology, a pressure reducing device is poor in buffer effect, and the erosive wear of black water to pipe fittings and pipelines behind the valve is too large are solved. 本实用新型属于黑水处理技术领域，具体涉及一种用于煤气化黑水处理系统的减压装置，包括高压黑水排出管通过法兰与角阀1入口连接，角阀1出口通过法兰与缓冲管2入口连接，缓冲管2通过进液管3与闪蒸塔4连接；缓冲管2的高度为80～100cm，缓冲管2的直径为60～80cm，解决了现有的黑水处理技术中的减压装置缓冲效果较差，黑水对阀后管件和管道的冲蚀磨损过大的问题。