DE19851085A1 - Push grate arrangement for solid fuel boiler, combustion furnace or burner involves stepped grate with rigid grate unit and movable grate unit which lower in stages from fuel intake to ash removal point - Google Patents

Abstract

A stepped grate (30) in a solid fuel boiler, combustion furnace or burner works with a rigid grate unit (3) and a movable grate unit (4), lowering in stages from the fuel intake (31) to the ash removal point (32). For a horizontal lift movement backwards and forwards the movable grate unit (4) is arranged on the rigid grate unit (3) or on a common baseplate.

Description

The invention relates to a moving grate arrangement for a Solid fuel boiler, incinerator or burner.

Moving grate systems of incinerators of the aforementioned Kind tolerate a very wide range of fuel requirements regarding particle size, moisture content and trickle ability. Known moving grate systems are moving grate, Rocking grate and tipping grate. Sliding grates are also suitable for Fuels with a high ash content. For a good burnout to achieve, the layer height of the burner can be fabric on the grate during combustion in certain sem measures are influenced.

The object of the invention is to create a sliding grate arrangement voltage for a solid fuel boiler or the like, wel che is simple and in which in particular Layer height of the fuel on the grate for an optima len burnout can be finely influenced or finely regulated.

The object on which the invention is based is achieved by a moving grate assembly of the type specified in claim 1.

The moving grate arrangement is advantageously further developed by the features of claims 2 to 18.

The essence of the invention is the moving grate arrangement as steps rust with a rigid grate unit and a movable one Form grate unit, the stepped grate in one Arrangement in the boiler, furnace or burner from the fuel input drops in stages to the ash discharge.

In particular, the movable grate unit is rigid  Grate unit or on a common base plate for one essentially horizontal reciprocating reciprocating movement slidably arranged, and it advantageously has the rigid Grate unit rigid grate elements and the movable grate Unit movable grate elements, the fuel con Promote tactical from fuel entry to ash discharge the rigid and movable grate elements in alternating rows are arranged, d. H. alternately interlocking fen.

The stroke of the movable grate unit is preferably a adjustable or adjustable.

The moving grate arrangement is particularly designed so that the primary combustion air through an opening from the stu fenrost underside or broadside of the step grate top or can be supplied to the fuel through grate element slots.

At least some of the grate elements can be replaced individually be designed bar.

The grate elements advantageously have a cross section Angular shape and have breakthrough-free large-scale horizons valley leg transverse to the fuel delivery direction while the vertical legs of the grate elements at a base of the fixed or movable grate unit attached, in particular plug-in, are.

The base of the rigid or movable grate unit are included Advantage fixed and movable vertically arranged plate-like holding combs, which are preferably used in a plug-in Binding of grate elements have open slots at the top.

The movable grate unit can rotate slowly the electric drive motor at least over a dre  eccentric, a drive linkage, a swiveling che crank and one firmly with the movable grate unit connected driver reciprocally driven who the.

The drive motor can also be the drive for egg ne ash removal screw, which is at the ash discharge stretched across.

The drive motor is electrically controlled and enabled in particular an interval operation of a lifting movement of the Step grate and / or a rotary movement of the ash removal slug.

The lower end region of the step grate is expedient from the ash discharge through an essentially vertically arranged one separated cross plate.

The entire step grate or parts of the step grate can interchangeable modules.

A particularly simple structure results if all Grate elements are constructed identically.

The grate elements advantageously have a top leading edge angled downwards in the direction of ash discharge on.

The base plate is U-shaped, particularly in a side view formed, being on the base plate or within the U-shaped base plate also arranged the ash discharge or can be included.

Quiet step grate operation is possible if the steps rust in particular at least one noise protection or insulation board  has, preferably on the front of the boiler.

Due to the movable and rigid grate unit of the Fuel entry to the ash discharge on the upper side in steps sloping step grate, which horizontal contact surfaces for the fuel, but also has vertical stops areas for the fuel, especially through the Rostele thickness of the upper horizontal leg of a grate element and by leading edges angled downwards Direction ash discharge, is in the operation of a moving step practically one rust after the direct fuel input continuous movement of the ember bed like on a conveyor band evoked. By the aforementioned vertical to Impact areas for the fuel or the level training the ember bed moves towards the ash discharge inevitably in the direction of ash discharge, i.e. not on the Place, as is often the case with known feed grates Case is. The ember bed thickness or layer height of the fuel depending on the (possibly adjustable) Quick movement of the movable grate elements and the (ge if necessary, adjustable) stroke length and / or by regulation ten interval operation of the grate drive according to the invention very much can be finely regulated, which enables optimal unwinding light becomes. The fuel material wanders on the stu fenrost different temperature zones. The distillate fabric dried, degassed and finally completely ver burns. Combustion arrives at the end of the step grate residues in an ash pan with preferably automatic shear ash removal through a rotating ash removal slug.

The combustion air (primary air) is burned from below Large area or fed through many slits. This Air flow according to the invention causes a good one Cooling the grate elements, on the other hand preheating the  Combustion air, which has a positive effect on the combustion.

Another advantage of the invention is that it is very simple mechanical design of a maintenance-friendly feed rust, whereby cast links can be dispensed with. A one already controllable electromotive sole drive on the order of z. B. 0.25 kW drive power already for a reliable rust movement and rotary movement the ash removal screw for continuous operation or an intermittent operation during known designs in this regard to complex hydraulic drive technology have to fall back. The simple drive technology from Erfin dung also allows a further reduced construction important.

The invention is illustrated below with the aid of an embodiment game with reference to the accompanying drawings explained; show it:

Fig. 1 a solid fuel boiler schematically in a vertical section seen from the side,

Fig. 2 shows the solid fuel boiler according to Fig. 1 in a horizontal section plan view of a reciprocating grate arrangement, together with drive and ASH REMOVAL WORM,

Fig. 3 shows the drive according to Fig. 2 in a schematic side view,

Fig. 4 is a horizontal section through the Schubrostanord voltage of Fig. 2 together with drive and ash handling screw along the line AA of Fig. 5,

Fig. 5 is a schematic partial vertical section according to FIG. 1 for purposes of illustration of the reciprocating grate assembly in greater detail,

Fig. 6 shows a section through the sliding grate arrangement along the line BB of Fig. 5, and

Fig. 7, 8, 9 and 10 are partial perspective views of the push grill arrangement according to FIGS. 1 to 6.

According to the drawing, a solid fuel boiler 40 in the form of a solid-fuel blowpipe burner with automatic stoker screw-chip feeder 37 has a thrust grate arrangement in the form of a driven step grate 30 with a drive motor 18 and a drive linkage 15 , 16 outside the boiler 40 over its entire inner base area .

The step grate 30 is designed as an interchangeable unit and is built on a common base plate 1 which is U-shaped in a side view, the front leg of the boiler in close proximity to the fireclay lining 38 extends from the base of the boiler to just below the fuel feed 37 and the shorter leg of the rear of the boiler 39 also includes the ash discharge 32 , in which an ash removal screw 20 extends transversely in the region of the height of the boiler base.

The ash removal screw 20 is driven by the drive motor 18 , which also drives the step grate 30 .

In particular, the step grate 30 has a rigid grate unit 3 and a movable grate unit 4 , which in an arrangement in the boiler 40 drops from the fuel feed 31 to the ash removal 32 in stages.

The movable grate unit 4 is arranged on the rigid grate unit 3 so that it can be moved back and forth for an essentially horizontal lifting movement. The rigid grate unit 3 is in turn attached to the base plate 1 .

The rigid grate unit 3 has rigid grate elements 5 , as well as the movable grate unit 4 has movable grate elements 6 , with the fuel contacting fuel entry 31 to ash discharge 32 promoting rigid and movable grate elements 5 , 6 being arranged in alternating order and in stages sloping interlocking.

All grate elements 5 , 6 are of the same design and have zen in cross-section angular shape, with breakthrough-free, large-area, optionally roughened or corrugated horizontal legs 33 are provided transversely to the fuel delivery direction R and vertical legs 34 which face the fuel input side.

The side facing the ash discharge side in the boiler transverse end 36 of the top horizontal leg 33 of each grate element 5 , 6 is angled downwards, with a narrow grate element slot 35 for an air passage of primary combustion air L from the bottom or the bottom of the bottom of the boiler remains to the fuel, which lies on the horizontal legs of the grate elements and is promoted.

The vertical legs 34 of the rigid and movable Rostele elements 5 , 6 are plug-in in two lateral rigid or movable vertical plate-like holding combs in slots, in which case the grate elements 5 , 6 together with the associated holding combs, which by means of cross struts or guide 7 , 8 together are connected, each form the rigid or the movable grate unit 3 or 4 .

On the base plate 1 or within the U-shaped Grundplat te is - as already said - the ash discharge 32 is taken up, the lower end region of the step grate 30 being separated from the ash discharge 32 by a substantially vertically arranged transverse plate 2 .

The movable grate unit 4 is by the (in operation slow sam rotating) electric drive motor 18 , a rotating eccentric 17 , a drive linkage 15 , 16 , a pivoting crank 13 , 14 , 19 and one firmly connected to the movable grate unit 4 Carriers 11 , 12 driven horizontally back and forth, wherein the drive motor 18 is electrically controlled and in particular allows an interval operation of a lifting movement of the step grate 30 and / or a rotary movement of the ash removal screw 20 .

The entire step grate 30 is provided as a replaceable module in a boiler or the like. However, parts of the step grate, for example the movable grate unit, or parts of the movable grate unit can also be formed as modules.

The stroke of the movable grate unit 4 can be adjusted or adjusted by changing the effective lengths of the drive linkage 15 , 16 or the vibrations according to FIG. 3.

All grate elements 5 , 6 can be replaced individually as wearing parts by loosening them from the plug connection with the holding combs.

For low-noise operation, the step grate 30 has a noise protection or insulation plate 21 in front of its front vertical leg of the base plate 1 .

The individual components are thus constructed on an exchangeable, U-shaped carrier plate in the form of a base plate 1 . The grate area is separated from the ash pan by the separating plate 2 . The two fixed holding combs are attached directly to the base plate 1 or the carrier plate. For Ver stiffening and as a mounting support, the two lateral struts 8 are welded between the retaining combs. The two movable holding combs 4 are also braced via a strut 9 and the driver elements 11 , 12 . In addition, the two movable holding combs 4 are suspended as a movable grate unit horizontally displaceably on the rigid grate unit via two guide strips 10 . In a Hori of the movable grate unit zontalverschiebung the two guide rails 10 move into two elongated holes 22 of the star ren holding combs.

By intermittent movement of every second (movable) grate element 6 , a temporarily continuous order of the embers bed is generated. The modular design makes it easy to replace wear parts right through to the complete grate system.

It should be noted that the same contained in the subclaims features that are always protected despite the forma len reference to the main claim should have constant protection. Otherwise, all fall into the entire application documents contained inventive Features within the scope of the invention.

Claims (18)

1. Sliding grate arrangement for a solid fuel boiler, combustion furnace or burner, characterized by a step grate ( 30 ) with a rigid grate unit ( 3 ) and a movable grate unit ( 4 ), which is arranged in an arrangement in the boiler, furnace or burner Fuel entry ( 31 ) to ash discharge ( 32 ) drops in stages. 2. Sliding grate arrangement according to claim 1, characterized in that the movable grate unit ( 4 ) on the rigid grate unit ( 3 ) or on a common base plate ( 1 ) is arranged for a substantially horizontal lifting movement back and forth. 3. Sliding grate arrangement according to claim 1 or 2, characterized in that the rigid grate unit ( 3 ) has rigid grate elements ( 5 ) and the movable grate unit ( 4 ) has movable grate elements ( 6 ), the fuel contacting ends from the fuel entry ( 31 ) rigid and movable grate elements ( 5 , 6 ) which promote ash discharge ( 32 ) are arranged in alternating order. 4. Sliding grate arrangement according to claim 2 or 3, characterized in that the stroke of the movable grate unit ( 4 ) is adjustable or adjustable. 5. Sliding grate arrangement according to one of claims 1 to 4, characterized in that the primary combustion air (L) through an opening from the step grate underside or broad side through grate element slots ( 35 ) of the grate element top or the fuel can be supplied. 6. Sliding grate arrangement according to one of claims 3 to 5, characterized in that at least some of the grate elements ( 5 , 6 ) are individually replaceable. 7. Sliding grate arrangement according to one of claims 3 to 6, characterized in that the grate elements ( 5 , 6 ) in cross-section be angular shape and breakthrough-free large horizontal legs ( 33 ) transversely to the fuel delivery direction (R) sen, while the vertical legs ( 34 ) of the grate elements ( 5 , 6 ) on a base of the rigid or movable grate unit ( 3 , 4 ), attached, in particular plug-in, are. 8. sliding grate assembly according to claim 7, characterized in that the base of the rigid or movable grate unit ( 3 or 4 ) are fixed or movable vertically arranged plate-like holding combs. 9. Sliding grate arrangement according to one of claims 1 to 8, characterized in that the movable grate unit ( 4 ) by a slowly rotating electric drive motor ( 18 ) at least via a rotating eccentric ( 17 ), a drive linkage ( 15 , 16 ), a pivotable Crank ( 13 , 14 , 19 ) and a fixedly connected to the movable grate unit ( 4 ) NEN driver ( 11 , 12 ) can be driven back and forth. 10. Sliding grate arrangement according to claim 9, characterized in that the drive motor ( 18 ) is also provided for the drive of an ash removal screw ( 20 ) which extends transversely when the ash discharge ( 32 ). 11. Sliding grate arrangement according to one of claims 1 to 10, characterized in that the lower end region of the step grate ( 30 ) from the ash discharge ( 32 ) is separated by a substantially vertically arranged cross plate ( 2 ). 12. Sliding grate arrangement according to one of claims 10 to 11, characterized in that the drive motor ( 18 ) is electrically controlled and in particular enables intermittent operation of a lifting movement of the stepped grate ( 30 ) and / or a rotary movement of the ash removal screw ( 20 ). 13. Sliding grate arrangement according to one of claims 1 to 12, characterized in that the entire stepped grate ( 30 ) or parts of the stepped rack are interchangeable modules. 14. Sliding grate arrangement according to one of claims 3 to 13, characterized in that all grate elements ( 5 , 6 ) are constructed identically. 15. Sliding grate arrangement according to one of claims 3 to 14, characterized in that the grate elements ( 5 , 6 ) on the upper side have a downwardly angled front edge ( 36 ) in the direction of ash discharge ( 32 ). 16. Sliding grate arrangement according to one of claims 2 to 15, characterized in that the base plate ( 1 ) forms a U-shaped side view. 17. Sliding grate arrangement according to one of claims 2 to 16, characterized in that the ash discharge ( 32 ) is arranged or received on the base plate ( 1 ) or within the U-shaped base plate. 18. Sliding grate arrangement according to one of claims 1 to 17, characterized in that the step grate ( 30 ) has at least one noise protection or insulation board ( 21 ).