DRAINAGE TREATMENT SYSTEM AND COMBINED POWER GENERATION FACILITY

摘要

A drainage treatment system 16 of the invention is a drainage treatment system that treats drainage generated when a gasified gas 33 is produced by a coal gasification furnace 12 and is purified by a gas purification device 14, and includes drainage treatment lines L11 to L15 which respectively treat slag drainage, venturi drainage, and stripper drainage generated when the gasified gas 33 is produced and the gasified gas 33 is cleaned and drainage treatment apparatuses 101A to 101E which treat treatment target materials in the drainages discharged from the drainage treatment lines L11 to L15. Accordingly, the drainages of the drainage treatment lines L11 to L15 are respectively and individually treated in response to the treatment target materials contained in the drainages without mixing the drainages of the drainage treatment lines L11 to L15.

主权项

1. A drainage treatment system that treats drainage generated when a gasified gas is produced by gasifying coal as a fuel in a gasification furnace and is purified by a purification device, the drainage treatment system comprising:
a plurality of drainage treatment lines that respectively treat a plurality of drainages generated when the gasified gas is produced and the produced gasified gas is cleaned; and a drainage treatment unit that is provided in each drainage treatment line and treats a treatment target material contained in the drainage discharged from each drainage treatment line, wherein the drainages generated when the gasified gas is produced and the produced gasified gas is cleaned correspond to any one of drainage including at least one of a group of alkali metal and alkali earth metal, drainage containing a large amount of ammonia, and final treatment drainage, wherein the drainage treatment unit includes a first heavy metal/fluorine treatment unit that removes at least SS, Pb, F, and Hg contained in drainage including at least one of the group of alkali metal and alkali earth metal, and wherein the first heavy metal/fluorine treatment unit includes a sulfide treatment unit that removes at least Pb and Mn contained in drainage including at least one of the group of alkali metal and alkali earth metal from the drainage including at least one of the group of alkali metal and alkali earth metal, and wherein each drainage of the drainage treatment line is individually treated in response to the treatment target material contained in the drainage without mixing the drainages of the drainage treatment lines.