SU1236285A1 - Continuous furnace - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to methodical furnaces, and can be used when heating the metal before rolling.

The purpose of the invention is to reduce fuel consumption by improving heat exchange conditions.

FIG. 1 depicts a methodical oven obish view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The furnace contains chambers: tomiline 1, upper welding 2, lower welding 3, methodical top 4 and methodical bottom 5, separated by gassing pipes 6, through which the heated metal 7 moves. The bottom chamber of the methodical zone and the adjacent vertical zone the chimney; channel 8 is divided into three channels by two longitudinal walls 9. located on the bottom 10 of the lower chamber of the methodical zone and on arches 11 above the exhaust channel 8. lined up to the level of the upper forming slip 6, diverging to the side with enkam furnace 12 at the start of welding the lower chamber to form a channel and konfu- Zor 13 between themselves, the ratio of flow area ilop1adi dripped to the passage sectional area of chimney ihego channel is 0.6-0.8.

The furnace works as follows.

Combustion products from the tomilane, upper and lower welding zones are directed through the upper and lower chambers of the methodical zone to the flue gas channel. In this case, part of the gases passes in a space bounded by two longitudinal walls, heated by the metal and the bottom of the methodical zone, and some in the space formed by the side walls of the furnace, the longitudinal walls and the channel with confuser.

Reducing the flow area for passage of flue gases evacuated from the lower zones contributes to a decrease in the vacuum in the lower zones of the furnace, during cutting, which reduces cold air suction

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into the furnace through the lining of the masonry. This leads to an increase in the temperature of the hearth, improved heat transfer in the lower zones and lower fuel consumption. In addition, increasing the pressure in the lower zones and keeping the required positive pressure on the metal level along the entire length of the furnace exclude the flow of combustion products from the upper to the lower welding zones. Thus, in this case, the flows of combustion products from the upper and lower zones are evacuated, separately from the furnace, not mixing with each other. As a result, the heat exchange conditions in the furnace improve.

As a result of the narrowing of the flow, the rate of flue gas removal from the furnace is increased to 1.5-2 m / s, which leads to an increase in the convective component of heat exchange in the temperature of the methodical zone of the furnace.

The ratio of the flow area of the middle channel formed by the transverse walls, the heated metal and the furnace hearth to the flow area of the smoke outlet channel is 0.6-0.8.

When the area is less than 0.6, a flow of combustion products from the lower zones to the upper zones is observed, which leads to a decrease in the pressure in the upper chamber of the methodical zone at the metal level and the discharge of the combustion products from the landing window.

When otponeniya more than 0.8, an unstable pressure equilibrium is observed at the metal level, at which the flow of combustion products from the upper zones to the lower ones occurs, or, conversely, as a result of a slight change in the ratio of gas flow rates through the upper and lower zones.

To reduce the pressure loss when the combustion products enter the confuser, its opening angle is 60-90 °.

As a result of structural changes, the flow area of the lower zones is reduced, which makes it possible to distribute the gas flows in the furnace and to reduce the inflow of atmospheric air into the lower zones. As a result, the heat exchange in the furnace is reduced and the fuel consumption is reduced by one.

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p l. Obpu; Circulation .5 (ilI b:) L11i.

VNIIPI USSR State Committee

but inventions and discoveries

113035, Moscow. F - 35, Raushsk nab. D. 4/5

Branch PPP "Patent, Uzh.gorod. , st. Proektiya. four

Claims (1)

METHODICAL FURNACE, containing lower and upper methodical and welding chambers and tomilny, planes, burners and a vertical smoke exhaust channel made in the bottom of the lower methodical chamber adjacent to the end wall of the furnace, characterized in that, in order to reduce fuel consumption by improving heat transfer conditions , the furnace is equipped with longitudinal partitions installed on the bottom of the lower method chamber from the end wall of the furnace to the level of the upper generatrix of the glide pipes, diverging to the side walls of the furnace at the beginning of lower welding chamber to form a channel and the converging tube between themselves, wherein the flow channel cross section area ratio to the area of flow section fume collection channel sostav- _ 0.6-0.8 wish to set up. §