DE916345C - Ring-shaped rotating grate with step-like staggered grate rings - Google Patents

Description

Ring-shaped rotating grate with step-like staggered grate rings underneath The mechanical furnaces are known to round grates, in which the fuel is used outermost edge enters and by the natural falling force automatically over the individual steps of the grate to the center point and thus to slag diarrhea. Round gratings are also known in which the grate surface is stepped downwards there is staggered grate rings, in which the fuel is driven by adjustable scrapers is moved from ring to ring. It is known to use grate disks and grate rings to align offset axes eccentrically to one another. Loading the grate and the slag is discharged either approximately in the middle or on the outside Rust edge. Here an optimal utilization of the fuel and a sufficient one Control of the combustion cannot be achieved because the grate surface formed in this way for example, not with their total area, but: with the central fixtures can only be effective as a ring surface. So much for this known version wipers and other guide surfaces are still required, more will occur Operational safety and the efficiency of the furnace reducing phenomena on.

The invention aims at the known mechanical furnaces to eliminate inherent disadvantages and a simple and economical construction Generate high performance firing. This is achieved according to the invention by that all grate bar rings are optionally eccentric to one another and also to the combustion chamber are stored and the fuel is fed radially from the outside of the outer ring. Through this A closed fuel cover is created and, from the central combustion core starting with an even temperature progression.

The grate bar rings run. on support and drive rollers with a common drive are connected, which is designed according to the invention so that the Movement speed of the individual grate rings against each other can be changed. The advantage is thus achieved that the movement of the fuel and its change of state home> transition from. one to the other grate ring can be influenced. Possibly each grate ring can also have its own drive.

The combustion air is supplied in a known manner by natural means Draft or by wind in an air box arranged under the grate rings, which can also be divided by zones.

The fresh fuel entering the upper rust ring ignites Reflection from the ignition leak above the inlet and through direct Radiation from the combustion chamber. After circulating over the first grate ring the ignited fuel when wiping onto the next grate ring underneath the bar circulated and stoked, which is what is necessary for hard-to-ignite fuels Ground fire results. This process is repeated from one grate ring to another mechanically without special additional equipment or operator intervention. At baking Fuels is also a permanent loosening of the fuel layer causes.

The gradual, circular combustion that runs from the inside to the outside corresponds to the theoretical combustion process. In contrast to the incineration, for example on traveling grids, stokers and similar furnaces where there is the combustion process is staggered backwards from the fuel inlet, whereby different types of gas layers rise vertically upwards, which one tries to mix by supplying so-called vortex air, form in the annular combustion around the columnar combustion core in the In the middle of the furnace there are cylindrical carbonisation gas zones on the outside, emanating from the combustion core irradiated uniformly and equally uniformly with excess oxygen from the combustion core are supplied. This results in complete combustion without additional Auxiliary equipment and a uniform temperature profile on all sides of the combustion chamber. The number of grate rings is expediently the heaviest and only with basic fire igniting fuels, such as raw lignite and peat, adapted.

Apart from the simple design of the invention, there are others Advantages through the simple foundation without slag and ash funnels the simple combustion air supply and the elimination of fire bridges, pendulum obstacles, Poking devices, pre-ignition devices, grate chains and all other mechanical ones Elements that are necessary for traveling grids and stokers.

The rust slips are not built-in like with stokers and other built-in ones Firing is permanent in the combustion chamber and thus uninterrupted by the action of the Exposed to heat, but they migrate into the shortfall of the with every revolution overlying grate ring. By pushing the fuel off the grate ring The poking effect resulting from rust ring is a permanent cleansing and purification the grate bars causes. The flowing through the covered parts of the grate rings Combustion air cools the grate bars and leads the absorbed heat to the combustion chamber to.

In the drawing, the object of the invention in Fig. Z is in the middle section and in Fig. z in plan view, limited to those necessary for understanding Parts shown.

Under the fuel funnel a, which is provided with a fuel shut-off and regulating device b, the grate rings c, d, e are rotatably mounted one above the other. The Koststabringe are reduced in diameter downwards. The grate bar rings c, d, e, which are rotatably mounted about their center points, are offset eccentrically from ring to ring, each to the other, according to the desired pushing-off of the fuel. This eccentric offset of the grate rings against one another results in mutual, one-sided corresponding overlaps of the grate ring surfaces, and the front edges of the grate rings lying above the bar form guide surfaces f, g, h, through which the fuel is pushed onto the d @ arunderlying when the grate rings rotate. The eccentricity also exists for the uppermost grate ring c in relation to the combustion chamber, which forms an arcuate constriction edge i after the fuel funnel that covers the grate ring on one side.

The grate bars of the grate rings, which are designed like a king in their longitudinal direction are placed on circular grate bar supports k, the outer on cylindrical rings l are attached. The cylindrical rings l rest with their lower edges on rollers at. The grate rings are driven by drive rollers on a drive shaft o sit. Instead of the common drive, each grate ring can be driven independently will. By changing the speed of movement of the individual accordingly Rust rings to one another can influence the course of the Verhrnung.

The mode of operation is as follows: The fuel automatically runs through the fuel funnel a onto the upper grate ring c and is pushed by this through the arcuate constriction edge i onto the grate ring d below the bar. The fuel is pushed off the grate ring d through the grate edge f. This process is repeated continuously from grate ring to grate ring until the fuel residues are thrown into the slag shaft p located in the center of the furnace. The offset of the individual grate rings to one another can be done so that at the point where a lower grate ring is most hidden by the grate ring above, the edge found g cut off with one another or are offset from one another in such a way that they form a step.

Claims (1)

PATENT CLAIMS-Ring-shaped rotating grate with stacked, step-shaped staggered Rosfring disks and a loading device above the grate surface and courageous discharge chute, characterized in that all grate rings to each other and optionally also eccentrically to the combustion chamber and the fuel is fed radially from the outside of the outer ring. z. Ring-shaped rotating grate according to Claim i, characterized in that the drive for the rotary movement of the individual Grate rings is designed so that the speed of movement of the individual grate rings is mutually mutable. . Referred publications: German patents. No. 637 549, 643 2I0.