DE1704931U - PRESSURE SECONDARY AIR FOR STEAM BOILER - FLAME PIPE - INTERNAL GRATE COMBINATION. - Google Patents

Description

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Device for adding

Secondary pressure air for steam boiler flame tube internal grate firing.

Eo is known to be difficult to bring about a completely even coverage of the grate over its entire surface with the fuel layer on grate firing systems. to be maintained and thus also to ensure that the passage of the combustion air supplied from below is uniform everywhere. In the case of inequalities, however, it is inevitable that too much air passes through the grate at individual points of the grate and too little air passes through the grate at other points, and thus individual coal particles burn with too much air and a lack of oxygen occurs at other coal or other fuel particles. This is particularly noticeable when working with general underwinds. Above the burning layer, the flames and gases are drawn backwards through the flame tube, as if drawn on belts running in the same direction, without any particular mixing of the individual layers taking place. A certain improvement is then achieved later by installing the known swirl stones or similarly acting devices that mix the combustion gases again without any. but it is possible to have brought the previously partially throttled combustion process to run in an ideal way. Particularly in the case of fuel types with a relatively high proportion of volatile constituents, a significant improvement in the combustion process has been achieved in modern water tube boilers by adding more air, the so-called secondary air, over the grate, either as a partial flow of the underwind generation or by means of its own fans . This addition of secondary air has been used relatively little in the case of internal flame tube grate firing systems, since no satisfactory results had been achieved with the designs at the time, and sometimes even a deterioration in the image composition of the combustion gases occurred due to the addition of too much secondary air. It is here, for example _T refer to the action of an open fire door When Spezialfeuerungen normal vJilig closed front mi the furnace has succeeded by diverting a part stream of ünterwindes and it is supplied as secondary air but half of the grate good results to achieve, but this arrangement allows for many furnaces and is not yet equivalent to the following solution to the problem.

The present invention consists in that the secondary air is blown into the combustion chamber with relatively high pressure (more than IQC cm WS) and in relatively few, directed, sharp jets above the grate, in such a way that the normal, in a certain way coincident, flow-parallel Ribbon-pulling outflow of the flames and combustion gases is sensitively disturbed and clearly recognizable eddies arise. The secondary air is generated in a separate small compressed air blower and fed in normal pipes. Thereby a real turbulence and an intimate mixing of the air with the combustion gases is achieved and, especially with younger types of coal, the locally distributed oxygen deficiency that is recognizable above the grate is eliminated and, compared to the partial excess of air, is compensated for directly within the planuuen effect, without dai .. z ^ large Luftüoerschass arises.

Claims (1)

The V, ir be lung wire, more through higher pressure and jet effect
than caused by, the amount of secondary air. According to the invention, the secondary air escapes from new, small ones
Nozzles, so that the amount of secondary air at · the new high
Pressure of the compressed air generator compared to the primary air does not increase
assumes a high proportion. For example, types of application of the invention also indicate
If you look at the arrangement of the blow-in nozzles, the following sketches can be used to produce pressurized air generators, namely: Figure 1) where an arrangement, in plan view, on _u Eder side of the grate via this side or a smal next to the stokehole each 1: perform number of small through pipes with nozzle-like discharge openings ^ uerschnitts-Sekundärluftsörahlen Figure 2) shows in plan another example of the execution of the Kind, since the supply of this secondary air in 1 or more; such radiant tube in ir. or below the grate or. Zündgewüloes he follows. Fig. 3) shows in section that the secondary air e.g. in 3 small « Blasting from the grate delimitation brickwork at the end of the Eosö ( is blown in diagonally against the withdrawing gases. Each represents: a) aas undulating plammi ^ ohr b) the grate c) the furnace (e.g. a litter furnace) d) the Vuerfer e) ίε .. Schürloch f} the withdrawing flames and bands of combustion gas g) the secondary air jet nozzles, their outlet air volume] in
h) the secondary air ducts are fed to them and can come from a common collecting line. 1 η s ρ r u c h: Device for adding secondary air in L'a ./. Pfkessel-Plaismrohr-Innenroötfeuerungen, thereby ge ^ e nzeiexmet that to generate the air pressure to be injected, air compressors, rotary piston geoläs oaer high pressure ventila'toren m ± i a]) jerking of ÜDer ICOO: ν.- and at the end of the AJ-sblase-supply lines for the compressed air i: the combustion chamber a; i3enar ^J üi ₅ e jet, irirungsgenerator mix; a total carrion cross-section per tube under ^ -xcm ^ are provided. (Dr. Ing- Carl Pörderreu'thor)