SU31549A1 - Device to improve heat transfer in the fire and smoke tubes of steam boilers - Google Patents

Description

The invention relates to devices for improving heat exchange in the heat and fire tubes of steam boilers by using non-resistant inserts in pipes.

In the proposed devices, the filling tubes of the insert are retained by OJ fallout with the help of various stop parts at the ends of the tubes and are inserted into them freely with the possibility of rotation about the axis of the tubes.

In FIG. Figure 1 shows a cross section of the fire tube of a steam boiler with a device to improve heat transfer; FIG. 2 is the same with the insertion of a different section; FIG. 3 is a longitudinal section of the fire tube.

Narrow longitudinal inserts 2 are attached to the flue pipe / steam boiler, which are in contact with the pipe wall along their narrow sides, which do not interfere with the free flow of flue gases from the surfaces of the pipes themselves and present a very small resistance of hot gases through the pipes.

The inserts are made of refractory, durable material, and withstand tremors at a high temperature, for example, of melted basalt. The surface of the inserts 2 can be either smooth or corrugated to increase the convection heating surface.

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In the direction of gas movement, the inserts have the shape of a body of the best streamlining, rounded in front and narrowed in front. On the side of the entrance of hot gases into the tube, the inserts 2 are held in the tube by a narrowing of its diameter 3; on the discharge side of the gas from the pipe, an end insert 4 is inserted, held by a metal rod 5, common to a whole series of smoke tube inserts, flared in tube sheets 6 and. 7. The width of the insert must be somewhat smaller than the internal diameter of the pipe, even when hot, in order to allow its free movement inside the pipe.

At a high temperature of the flue gases of the insert, heated by convection by gases passing inside the pipe, heat generated by radiation is emitted from the HP of the walls of the flue pipes. As a result of reducing the width of each part of the partitioned pipe, convection increases heat transfer coefficient due to an increase in the rate of gas movement in close proximity to the pipe wall.

Since the inserts are made up of separate independent pieces along the length of the pipe, when moving, for example, a steam locomotive, they will, turning on the joints, rotate inside the pipes, scrub soot from

walls and facilitating its entrainment together with gases, which reduces the risk of pipe clogging with soot. When cleaning the boiler, the inserts are easily removed from the pipes through the smoke box of the boiler.

The inserts may have in cross section any shaped form, for example, the shape shown in FIG. 2. To bring the gases into a vortex motion, the inserts may be curved in the length direction.

The subject is chosen and.

A device for improving heat transfer in the fire and smoke tubes of steam boilers by using refractory inserts in the tubes, characterized in that the inserts 2 are inserted into the tubes freely with the possibility of turning them around the axis of the tube, which inserts fill the tube and are prevented from falling out with the help of these or other stop parts at the ends of the pipes.

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Fig 2,