DE465837C - Inclined grate firing - Google Patents

Description

Inclined grate firing In the case of inclined grate firing, the type of furnace operation is very much dependent on the type of fuel. Certain types of fuel tolerate a very strong drying out and can then be relatively smaller Grate surface burned out «ground, while others only with less pre-drying can be burned as they tend to rush if they are too harshly pre-dried will. The formation of flycoke is also largely dependent on the type of fuel.

On the combustion of the smoldering gases, mainly in the front Part of the grate are driven out, the water content of the fuel is also still of great influence, since the water vapors burn. reduce the operating temperature and thereby worsen the combustion itself.

These considerations have led to the construction of an inclined grate furnace, in the case of the rear grate section above the rear part due to vertical partitions a special one Mixing chamber for the carbonization gases and the hot combustion gases from the main gas space is separated and in which the water vapors are essentially only then the fire gases be added when these are completely burned and their highest temperature achieved. The special mixing and combustion chamber also becomes part of this used to excrete the entrained flying coke by hitting the walls of the combustion chamber and let it fall back onto the fuel layer.

In the drawing is an embodiment of the new inclined grate furnace shown in longitudinal section.

d is the inclined grate, which is designed as a step grate or as a moving grate can be. At the upper end is the coal feed hopper b with the coal weir c, and behind it is the known:, 2 smoldering room d, in which the water and the heavy smoldering gases are withdrawn from the fuel stop. Behind the Smoldering chamber d is a mixing and combustion chamber through a vertical wall e from the combustion chamber k f divided, the lower edge of the wall c is so high that the under the fire bridge vault g gases shooting forward under the lower edge into the Room f to get in, while the other wall h of the 1Uischraumes goes so far down that the gases shooting forward from the rear end of the grate are not under the wall get away into the climbing room d.

The in your room d expelled carbonization gases pass under the wall likewise hour period into the room F where they are called with the 2ren from the back "Stainless coming and excess air containing gases are mixed together and burned, the burned gases pass through the apertures i in. the main gas space k and from there to the boiler p.

The heat of combustion generated in room f is also shared by the wall h with, which radiates this heat into the room d and onto the furnace layer and so that the fuel is dried and deglazed. Since at the entrance = the When firing aya, mainly water vapor is expelled, so is above this Place a channel zz running transversely through the side walls, bypassing the the mixing and combustion chamber opens into the main gas chamber at o. The water vapors will. So if possible kept away from your combustion chamber f and only in the room h mixed with the other gases so that they do not allow the smoldering gases to burn out properly hinder more. Since the water vapors also have a certain amount of carbonization gases contained, they cannot simply be sucked off and led into the open, but they still have to be burned in the furnace. This combustion takes place but now in a stream of very hot and completely burned-out gases, so that even these heavy smoldering gases, which contain a great deal of water vapor, are perfect Burned out: by the fact that the space f through to the boiler heating surface p a wall e is covered, the heat radiation of the burning in room f Prevents gases from reaching the boiler surface p in contact with water, and the heat is generated to a greater extent the wall h communicated and with it the pre-drying and degalification of the fuel made usable.

Because the gases generated under the fire bridge, völbe g push into the space f, the entrained coke is excreted here brought. So it trickles down the wall and back onto the inclined grate; because the carbonization gases exiting the room have too low a speed, to be able to pull it up again with you. This way the harassment becomes considerably reduced by the flying coke.

The channels o can be provided with gate valves, depending on the the water content of the fuel is the amount of water vapor extracted from space d to rc - gehl: .-.

Claims (1)

PATENT CLAIMS i. Inclined grate firing, characterized in that behind the smoldering space above the rear grate part, a mixing chamber (f) is separated from the main gas space by partitions (h, e) , in which the gases flowing forward from the rear end of the grate and those emerging from the smoldering area are separated Mix the gases and burn the latter, whereby the burned gases exit through openings in the wall (s) located after the main gas space in the latter. a. Inclined grate furnace according to claim i, characterized in that the front partition (dz) of the mixing and combustion chamber (f) goes so deep that the front rear end of the grate cannot enter the smoldering chamber (d), while the lower edge of the rear end Partition wall (e) of the mixing and combustion chamber is so high that the gases shooting forward under the fire bridge vault (g) can get into the mixing and combustion comb. 3. Inclined grate furnace according to claim i and 2, characterized by again emanating from the smoldering chamber above the start of the grate, in the main gas space (h) bypassing the mixing chamber (f) opening channel l'71,0) with optionally adjustable passage for introducing the excreted water vapors directly into the fire gases.