Abstract:

Abstract:There are exacting requirements about the fuel to feed water ratio and the fuel to air flow ratio for the oncethrough boiler. In its control logic,the crossing restriction circuit may be added to prevent sharp variation of main steam temperature and reheat steam temperature and to prevent instable combustion.The functions of the crossing restriction in control logic were introduced. The reasons of lower limit action of fuelfeed water crosing restriction were analized. Some measures,such as to adopt BTU loop in control logic to amend the total fuel amount and to count the capacity air flow of the mills into the fuel amount timelapse and stepped during mill startup and shutdown,were proposed.

Key words:

font-family: E-HZ-PK74810c, color: black">Keywordsfont-family: SSJ-PK74820000002, color: black">:font-family: E-BZ-PK748e5, color: black">oncefont-family: MingLiU_HKSCS, color: black, mso-bidi-font-family: MingLiU_HKSCS">font-family: E-BZ-PK748e5, color: black">through bolerfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">fuelfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">feed waterfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">control logicfont-family: SSJ-PK74820000002, color: black">;font-family: E-BZ-PK748e5, color: black">crossing restrictionfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">optimization