A type of boiler

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This boiler is a single-drum, natural-circulation, low-odor alkali recovery boiler. The furnace is surrounded by a membrane-type water wall, and a steam cooling screen is installed at the furnace outlet. Following that are an IB-grade superheater, a II-grade superheater, a III-grade superheater, and an IA-grade superheater; there is also an evaporator tube bank, with two stages of economizers arranged at the rear part of the boiler. The boiler features a fully steel structure, with a fully suspended and fully sealed design; all loads are supported by suspension rods attached to the top plate of the framework. The layout of the alkali recovery boiler adopts a compact, enclosed design. The alkali recovery system uses an alkali furnace–electrostatic dust removal system, namely the low-odor type. This boiler features stable combustion, a wide range of load adaptation, long continuous operation periods, safe and reliable operation, rapid startup, minimal ash accumulation, good sealing performance, and simple operation. Design parameters: Daily solid content of black liquor to be treated – 2200 tds/d; Rated evaporation capacity – 350 t/h; Rated steam pressure – 8.4 Mpa(g); Rated steam temperature – 480 ℃; Feedwater temperature – 130 ℃; Temperature of smoke leaving the economizer – 170 ℃; Temperature of primary air – 150 ℃; Temperature of secondary air – 150 ℃; Temperature of tertiary air – 30 ℃; Auxiliary fuel: Heavy oil or natural gas. Basic dimensions of the boiler: Furnace width – 11280 mm; Furnace depth – 10960 mm; Elevation of the centerline of the boiler drum – 60000 mm; Elevation of the top plate of the boiler frame – 66000 mm; Boiler width (distance between the centers of the left and right columns) – 28000 mm; Boiler depth (distance between the centers of the front and rear columns) – 34500 mm