【Weekly Topic】What factors should be considered when determining the furnace width? (4.30--5.6)

This post was last edited by liuyongduo1 on 2011-4-29 19:24: 1) Penetration depth of secondary air in the furnace. 2) The arrangement of the heated surfaces within the combustion chamber, the arrangement of the rear heated surfaces, and the arrangement of the separator must be coordinated with each other. 3) Fuel. Supply and dispersion of limestone and recycled ash. An excessive furnace depth makes it difficult for secondary air to penetrate the combustion chamber, resulting in uneven distribution of volatiles within the furnace, which leads to incomplete combustion and excessive emission of pollutants.

Personal design is primarily based on the diameter of the flame, as well as the height-to-diameter ratio and the surface heat intensity of the furnace tube

Reply to 1# zgj2405: 1. To achieve good steam quality, the steam drum must have a certain length, and the width of the furnace is designed to match the length of the steam drum. 2. The furnace width should also accommodate the layout of the superheater system. It cannot be too wide nor too narrow; if it is too wide, the steam flow velocity is too low, which is not beneficial for protecting the superheater, and the flue gas flow velocity is also low, resulting in poor heat transfer efficiency ； It is too narrow; the steam flow rate is too high, resulting in a large pressure drop in the superheated steam system. Additionally, the flue gas flow rate is high, causing severe wear due to fly ash. 3. To simplify the layout, the width of the tail flue is usually the same as that of the furnace chamber. Therefore, the layout of the rear heating surfaces must also be taken into account when determining the furnace width.

Determine the cross-sectional area based on the heat load per unit cross-sectional area of the furnace chamber.

This post was last edited by dongjiang1001 on 2011-9-2 17:57: Fuel properties, equipment layout, and boiler room dimensions.

Heat load and furnace heat intensity ~ Control the furnace volume, and then determine the furnace cross-sectional ratio or the diameter of the circular cross-section based on the length and arrangement of the furnace tubes

Depending on the type of fuel used, the heat load per unit volume and the heat load per unit area can be determined. By combining this with the total heat generation required by the boiler as specified in the process, it is possible to determine the range of cross-sectional area and volume for the furnace, thereby determining whether the furnace will be of a slender or robust design. With reference to the layout of the burner and the primary air, determine which side of the furnace bottom is wider and which side is narrower.