SU44503A1 - Steam Blower for blowing vapor of heating surfaces, for example, economizer pipes - Google Patents

Description

A sticky deposit of soot and fly ash is usually deposited on the surface of the economizer heating tubes for a short period of time, thereby reducing the heat transfer coefficient of the economizer.

Scraping off smooth pipe contaminants with scrapers, as used by the Green economizer, is extremely impractical, while manually blowing steam with a flexible hose vent equipped with a number of holes or nozzles at the end of the pipe makes the stoker difficult and not full work.

When using several blowing pipes screwed into the steam distribution pipe, moved, lowered and raised with the help of sliders, very complicated and expensive mechanisms are obtained.

Placing inside the economizer stationary stationary purge tubes in the gas flow requires the use of too many vent tubes and nozzles and, therefore, a steam pipe with a diameter often much larger than the main steam line.

(147)

In view of the shakhmatnogo arrangement of parallel pipes of the economizer, blowing devices are used consisting of systems of blowing pipes placed between the pipes to be blown in parallel with the latter, which systems receive reciprocating movement from the engine.

Blow pipe systems are passed to the economizer, ensuring that outside air is not exposed to air. In order to inspect and conveniently replace rusted or deteriorated blowing pipes, these pipe systems must be so designed that the connecting pipes of the individual systems, the steam distribution and drive mechanisms lie outside the gas path and only the blowing pipes are in the gas stream.

In the proposed steam blowing device, in order to limit the amount of steam consumed and supply it to only one row of blowing pipes, each system of these pipes is equipped with a steam distribution valve, which receives periodic turns at the final positions of the system. In order to shorten the useful life of the blower, steam mist sprays

located not only at the ends of the pipes, but also at half or at every third of their length.

In FIG. 1 shows a view of an economizer equipped with the proposed blower; FIG. 2 is a longitudinal section of it; FIG. 3-6 - longitudinal and transverse sections of the steam distribution valve; FIG. 7 is a view of the outside of the closure for passing the blow pipes; FIG. 8 is a longitudinal section of it.

The proposed apparatus consists of blowing pipes 7, of which each is provided at the end and in the middle or at every third of its length by spraying steam with the crowns of steam nozzles. The pipes 7 are divided into separate groups of several blowing pipes each, connected by the distributor pipes 2 along the entire height of the economizer. The pipes 2 are alternately fed with steam or air during each movement to and fro the whole pipe system by means of a steam distribution valve 3. The stroke length of the entire pipe system is equal to half the length of the finned tubes of the economizer. The steam distribution valve (Figs. 3-6) is turned by fist knobs per turn every time it moves back and forth, as a result of which each of the pipes 2 with the respective blow pipes is alternately powered by steam. The movement of the pipes back and forth can be carried out directly from the piston of a water engine 4 with a distribution similar to that of a single-cylinder pump.

To reduce the stroke of the engine 4, it is possible to turn on the lever and consequently move the engine closer to the wall of the economizer in order to allow free passage. You can also use a rack with a return movement, driven by an electric motor. The use of a crank mechanism has the disadvantage that the movement is uneven, as a result of which not the entire heating surface of the finned tubes is subjected to the same time to the action of the steam jet.

If the blower apparatus (Figs. 1, 2), consisting of blowing tubes / located across the entire surface of the economizer, is set centrally for automatic movement back and forth, then it will be skipped due to the varying resistances that occur in the vent holes. Since, due to the inaccuracy of the positioning of the vent pipes relative to each other, they cannot be used as guides, it is necessary to give those to the whole apparatus, placing them outside the economizer. Therefore, the whole system of pipes / and 2 is not only suspended from the four-wheel trolley 5, but also provided with guide rollers at the bottom and side.

As the blower pipe system from the influence of steam expands and almost ne can be made absolutely accurately, the inlet openings for the passage of pipes in the economizer wall have to be made much larger diameter than the diameter of the pipes themselves. In order to eliminate the resulting leakiness, each blower tube 7 is provided with a washer that covers it, which is pressed against the outer walls of the economizer with a spring 7 placed in a patch cap 8 (Fig. 7, 8). The washer 6 serving as a gate for the passage of the blowing pipes can move along the wall in accordance with the enlarged wall opening.

In order to prevent condensation water from entering the heating surface, which may lead to the formation of scale bark, especially when starting up and during the inactivity of the blower, it is necessary to free the condensate even when entering the steam distribution valve, for which the water separator 9 in the faucet ( Fig. 6). The condensation water remaining after this should drain from the blowing pipes outside the economizer; in addition, it is necessary to observe, when launching in the course, descending whether all condensation water is available. Therefore, the first crown of spray steam nozzles, both during operation and at rest, should protrude slightly outwards from the self-sealing holes of the wall of the economizer.

Practice shows that even with mechanical furnaces, most types of fuel deposit a sticky deposit of soot and fly ash on the economizer surface for 6 hours, especially at low waste gas temperatures, so that the heat transfer coefficient of the economizer may deteriorate to about. Therefore, devices for cleaning the economizer must be mechanized, and these devices should not be too complicated and should be placed in free space on the side of the economizer.

It goes without saying that this apparatus can also work vertically with the horizontal arrangement of the pipes of the heating surface, as well as horizontally with the vertical arrangement of the pipes.

The proposed apparatus can be used mainly only with ribbed economizers or air heaters, since the gas surface washed by them, with the same occupied area, is approximately eight times larger than with smooth pipes, why eight are required for the same heating surface.

times fewer blowpipes.

The subject of the patent.

Claims (3)

1. A steam blower for blowing steam over heating surfaces, for example economizer tubes, consisting of blowing tube systems placed between the blown tubes parallel to the latter, which systems receive reciprocating movements from the engine, characterized in that in one row of blowing pipes /, each system of these pipes is equipped with a steam distribution valve 3 (Fig. 2), which obtains periodic turns at the final positions of the system. 2. Use in the apparatus according to claim 1 of the closures for the passage of the blowing pipes, in which the grasping blowing pipes of the grip are pressed against the outer walls of the economizer by means of the spring 7 in the cover cap 8 (Fig. 7, 8). 3. Use in the apparatus according to claim 1 of spraying pairs of rims not only at the end of the pipes, but also at half or every third of their length, in order to reduce the useful stroke of the blowing device: to the patent assignees of the State All-Union combining the turbine industry Kotdoturbdna P 44503 PU d-chi f ;but Fot: 5 Fig.Z Fkg-4