SU1518620A1 - Furnace recuperator - Google Patents

Abstract

The invention relates to heat exchange engineering and can be used in metallurgy and mechanical engineering. The purpose of the invention is to increase thermal efficiency while increasing the compactness of the heat exchanger. Air (B) through the manifold 14 enters the air chamber 12 through the opening of the partition (P) 13, flows in the air section 10 onto the wall 7, warms up and enters the air section 11. Then the air moves along one slit of section 11, bends around P 13 and through another gap enters the discharge manifold 15. Heating gases (H) through the opening 5 in the wall 2 of the furnace enter the gas channel 3 formed by the duct (K) and wall 2 and release heat B. The execution K in the form of a semi-pyramid increases the volume gas channel 3, which increases the emissivity of and Twain leads to an increase in heat transfer. In turn, the growth of heat transfer reduces the size of K, turning it into a gas exhaust pipe. 1 hp f-ly, 2 ill.

Description

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The invention relates to heat exchange engineering and can be used in metallurgy and mechanical engineering. The purpose of the invention is to increase thermal efficiency while increasing the compactness of the heat exchanger.

FIG. 1 shows the recuperator, general view; in fig. 2 shows section A-A in FIG. one.

The recuperator contains an air duct 1 located on the outer side of the wall 2 of the furnace with the formation of the relatively last gas channel 3 communicated with the space 4 of the furnace through an opening 5 formed in wall 2. to the wall 2, the size of the slope of the edges of the semi-pyramid is in the range of 83- 88, and both sides of the wall 7 of the box 1 facing the gas channel 3 are provided with fins with the orientation of the ribs the other side. In the box 1, the convective air section 10 and rad -1 section section 11 are installed, respectively, which are combined into one air chamber 12 due to the volume of the intermediate partition 13. Pr :: ie the partition wall 13 is perforated in the convection section 10. The perforations are made in the order of magnitude. The intermediate partition 13 in the radiation section 11 divides it into two targets interconnected. The convective section 10 is connected to the supply manifold 1 through the perforations of the intermediate partition 13. The section of the supply manifold 1 decreases in the direction of air movement. The radiation section 11 is connected to the exhaust manifold 15. The cross section of the exhaust manifold 15 increases in the direction of air movement.

The recuperator operates as follows.

The cold air through the supply manifold 1 4 enters the air chamber 12 through the perforations in the partition 13, flows in the convective air section 10 onto the surface of the wall 7, warms up and moves along the fins 9, enters the radiation air section 11 and moves on one slit, bends around the intermediate partition 13 and

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then, along another first target, the hot air enters the discharge manifold 15.

The flue gases through the opening 5 in the wall 2 of the furnace enter the lower part of the gas channel 3 and, moving upwards along the fins 8, release their heat to the heated air and are discharged into the environment. The direction / movement of the heated air in relation to the direction of movement of the flue gases is cross-cutting.

Making the box 1 in the form of a semi-pyramid increases the volume of the gas channel 3, which increases the emissivity of the heating gases by increasing the thickness of the radiating layer. This leads to an increase in the intensity of heat transfer from the side of gases and an overall increase in heat transfer, P turn, an increase in the heat transfer coefficient —– and it is possible to reduce the size of box 1, turning it, essentially, into a chimney pipe one of the walls 2 of the furnace. The performance of duct 1 of the functions of the chimney at the same time as the heat exchange functions predetermines the above limits of the angle of inclination of the faces of the semi-shells) amides.

 With (-: an aclon of the faces at an angle of more than 88; m; 1 heat transfer to the wall O | yub 1 occurs. With an angle of less than 83, the aerodynamic resistance to the movement of flue gases in the gas channel 3 increases due to a decrease in its upper section, which will not ensure the passage of the entire volume of flue gases through channel 3, and this reduces the thermal efficiency of the heat exchanger.

Claims (2)

Invention Formula 1, A furnace heat exchanger containing an air duct located on the outer side of the furnace wall with a formation relative to the last gas channel communicated with the furnace space through an opening formed in the wall, characterized in that, in order to increase thermal efficiency with increasing compactness of the heat exchanger, the air duct is made in the form of a truncated half-pyramid adjacent the vertical edges to the wall, with the angle of inclination of the faces of the half-pyramid being in the range of 83-88. 5151Я6206 2. The recuperator according to claim 1, of which is with the orientation of the ribs on one side of the 1C and the fact that both sides are perpendicular to the edges of the other side of the duct wall, facing in the direction. Well, the gas channel, equipped with orebrefpua .f