DE499525C - Coal dust firing for high pressure boilers with steam generation by introducing superheated steam, taken from the steam room itself, into the water of the boiler drums - Google Patents

Description

Coal dust firing for high pressure boilers with steam generation by introduction superheated steam extracted from the steam room itself into the water of the boiler drums The pulverized coal furnace forming the subject of the invention, in particular is intended for high pressure boilers working according to patent 46q.555 by the fact that U-shaped branches branching off from the upper header pipes in the combustion chamber Superheater tubes are arranged, the transverse legs of which extend at different heights and thus the flow openings free for the flow of fire gas after the subsequent puffs of fire offer, while the hanging legs containment walls for flame and fire gas flow form.

After Big. i showing an embodiment of the plant in a vertical Section illustrated, U-shaped superheater tubes 2 are arranged in the combustion chamber i, which emanate from the upper header pipes 3, 4 and the hanging legs of which lie against one another, that they either alone or according to FIG. 2 z. B. with the help of rolled, welded or otherwise attached fin strips 5 boundary walls for the combustion chamber to about the depth a-a, while from there the outer thighs alternate in different, according to FIG. B. extend at three altitudes to thereby the Fire gas flow to provide passage openings after the subsequent fire puffs.

In the second step, for example, pipe coil elements 6 and 7 are arranged, initially as post-superheater 6 and above as Water preheater 7 for the feed water of the evaporator.

The steam is removed from the evaporation drum 8 in a known manner and The collector pipes 3 and then the superheater pipes 2 are pressed shut by the circulation pump 9. Here, U-shaped pipes can be parallel and bundles of such pipes along the combustion chamber can be connected in series. After passing the manifolds 4 and io arrives the steam to the post-superheater 6 and to the manifold i i. From here becomes a part of the steam as consumption steam D to the steam engine and the rest into the drum 8 directed to the formation of steam from their water content.

The feed water is from the feed line b from in parallel switched pipe elements existing water preheater 7 preheated, from where it also flows into the evaporation drum18. Part of the preheater 7 can also be accommodated in the following third fire train. On the third move you can continue the air preheater 12 to which the air flows at A and from which from the preheated combustion air to the pulverized coal burners 13 via the manifold 14 is fed, while the pulverized coal the burners by means of arranged from above Bunkers are coming.

From the third puff, the fire gases get into the fox and the chimney.

Claims (1)

PATENT CLAIM: Coal dust firing for high pressure boilers with steam generation by introducing superheated steam extracted from the steam room itself into the Water from the boiler drums, characterized in that U-shaped, Superheater pipes (2) branching off from the upper header pipes are arranged, their transverse legs run at different altitudes and thus free flow openings for the flow of fire gas after the subsequent puffs of fire, while the hanging legs provide boundary walls for flame and fire gas flow.