SU48976A1 - Device for blowing steam boiling and screen tubes - Google Patents

Description

The slagging of the first rows of boilers and furnace screens reduces the power, economy and duration of the working campaign of boiler units. In practice, such a slagging is widely observed, having been the scourge of many boiler houses.

To combat slagging, the following blasting methods are used, which have several disadvantages.

When blowing steam with rotating horizontal pipes with nozzles, these pipes, under the influence of high temperatures, are boxed, covered with cracks and quickly deteriorated.

A disadvantage of the steam blowing method with the help of blowers extending from the combustion walls is the low blowing efficiency for wide fireboxes due to the proximity of the nozzles to the walls of the firebox. The blowing of the boilers takes place from the bottom upwards, while the initial slagging process comes from the pollution of the upper rear part of the boilers.

The method of blowing air with the help of pipes introduced by hand into the furnace through the hatches, which has received the prevailing use, causes an increase in staff, difficult working conditions of the blowers, is not very effective for blowing heating pipes of powerful furnaces and is not applicable for

Blowing furnace screens. Horizontal, rotary, rotary nozzles with steam or water cooling jackets have many drawbacks, such as design complexity (seals for rotation, intermediate supports for wide fireboxes, etc.), as well as the danger of warping and burnout with possible deviations x from the normal mode and in the deposition of salts or scale on the walls of the cooling jacket and not applicable for blowing the screen. In the proposed blower for boiling-down pipes and screen pipes, protection from high temperatures and the location of the nozzles in any most convenient places are achieved by having the nozzles welded directly to the screen or to the heating pipes. Saturated steam is supplied to nozzles through tubes of small diameter, passing inside the screen or heating pipes and tightly connected with them. Due to the fact that the nozzles are fixed and installed in the most favorable direction, the blowing time should be low (approximately from 2 to 1 min.), And the number of nozzles is relatively large. Due to the small surface of the nozzle, which is exposed to heat (from the radiation of the furnace flame), compared to the cross-sectional area of the tube, cooling occurs due to thermal conductivity, and the nozzles are well protected from high temperatures. In addition to reliability, a major advantage of the proposed device is the easy possibility of fully automated blasting.

In the drawing of FIG. 1, the installation of a device for steam blowing of a first bundle of heating pipes of a double drum boiler; FIG. 2 is a top view of aa fig. one; FIG. 3 is a front view of the blower for the combustion screen; FIG. 4 is a longitudinal section of a boiling pipe; FIG. 5 the same parts of it; FIG. 6 is a cross-section of it; FIG. 7 is a longitudinal section of the screen tube; FIG. 8 is a view of it from the side of the nozzle; FIG. 9 is a cross-section of it; FIG. 10-vertical section of the furnace screen.

To the boiling or screen pipes / nozzles A coming out of the walls of the last nozzles are welded - for blasting, to which blown saturated steam of high pressure through pipes 2 is supplied (Fig. 4, 5). Tubes 2 are rigidly connected to boiling (Fig. 1) or screen (Fig. 3) pipes and communicate with steam collectors 3 (Figs. 1 and 10), where steam comes directly from the boiler.

The proposed device is also rational to use for blowing cold funnels (screens located on the inclined surfaces of the slag funnels).

The insignificant opening of each nozzle A, the proximity of the nozzles to the cooling surfaces, frequent blowing and high vapor pressure (directly from the boiler) completely prevent the nozzles from slagging.

The subject matter of the invention.

A device for stripping with steam of boiling and screen tubes, characterized in that the supplying blow-off steam tubes are rigidly connected with the boiling or screen tubes and are supplied with nozzles A, which go outside the walls,

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Fig 7 Pecker No. 48976

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