FR2677436A1 - Automatic device for raking out clinker (slag) with internal action, for a screw-fed burner for coal, plant and industrial waste - Google Patents

Abstract

Automatic device for raking out clinker (slag) with internal action on a screw-fed burner for coal, plant and industrial waste, etc. The invention relates to a monobloc screw-fed burner with device for automatically raking out the clinker from boilers operating on fuel of the coal, plant and industrial waste, etc. type. It is made up of: (1) a cylindrical cross member sliding on two guides (2) and equipped with the fingers for removing (raking out) the clinker, (3), the action is provided by two linear connecting rods with angular action, (4) two cylinder actuators ensure action (5) via clevices welded or sealed onto the base (plinth), (6) (7) two longitudinal guides ensure work in terms of length, (9) the slag (clinker) is gathered in an ash box (10) discharge screw for rejecting to outside the boiler room.

Description

The present invention relates to a device for ensuring automatic cleaning of multi-fuel screw burners (coals, vegetable, industrial waste, household waste, all other fossil, vegetable or industrial combustible materials).

The scouring of screw burners, to date, is carried out manually using tackers, clamps and hooks, which has the disadvantage of reducing the efficiency of the installation, while increasing the risk of operator accidents. humans, by burns or by the handling of heavy loads (coal base about 12% slag per tonne burned), hence to date, the limitation of the niche of powers around 2500 th / H. With the invention, the power can be brought to 10,000 th / H.

The device according to the invention overcomes the aforementioned drawbacks. according to a first characteristic, it comprises a mechanism that can be installed on screw burners already installed on plinths in civil engineering, OR on plinths designed in mechanical welding. It allows an action with a boiler closed to the same interior of the combustion chamber according to the particular embodiments - The cross support for the fingers of the scraper slides on two longitudinal guides (right and left-handed - The scouring action is carried out from the front to the rear of the boiler or vice versa or possibly from ia right to ia left and vice versa depending on the location of the latter within the boiler room in order to be able to allow the recovery of the slag in order to evacuate it towards the outside or towards an appropriate container.

- The movement is ensured by two cylinders.

- setting in motion can also be ensured by geared motors (for example in the case of existing and old installations).

The transmission connecting rods had movement. include air injectors to provide cooling for the mechanism and help improve secondary combustion (burning the particles in retention in the fumes of the first gas path).

he sketches of principle appended illustrate the invention.

Plate 1/2 shows in perspective the device according to the invention presented on a mechanically welded base.

Plate 2/2 represents a variant of the fingers of the scrubber.

With reference to these drawings, the device comprises (1) a cylindrical cross member sliding on two longitudinal guides (7) fitted with the fingers of the scraper (2).

The action is carried out from front to rear by two linear rods with angular action (3). The movement is effected by means of two jacks (4) fixed on screeds welded to the metal base or sealed in concrete (in the case of an existing installation) (5). The linear movement from the angular movement is transferred by two hollow yokes (6). The two longitudinal guides ensure the efficiency of the work in length. The assembly is cooled by calibrated blowing orifices (8). Slag and non-combustible waste is recovered in an ashtray (damper) (9) an evacuation screw is installed for the rejection of slag outside the boiler room (10). The pedestals of the base are in compression as well as the central box.The air supply orifices of the P2 box (14), air supply of the P1 box (15 and 16), air supply of the P3 box ( 13). the fuel supply screw (17), the hearth tank with set of nozzles (18) and had plates making up the hearth hearth (19). The cnaudière is installed and supported by the base outside the action of the scrubber (20>. The fingers of the scrubber are fixed on a clevis welded on the cross support 2/2 board,
Each finger of the scourer is equipped with a moldboard with a profile arranged according to the fuel used (9L). The fingers of the scourer are fixed by an axis (23). The cross-member is the active and soft element. The fingers of the scrubber (26) are held in the working phase by a fixed stop (25). The fingers of the scourer may have a different profile or a different amount depending on the fuel used.

The characteristic of the present invention lies in the action inside the combustion chamber (closed boiler). To achieve this The present inventIon consists in equipping the screw burners for solid fuels and plant and industrial waste with a mechanical assembly as presented on Plate 1/2. A sliding cylindrical crossmember on aveus longitudinal guides themselves crlindiiques, supports the fingers of the scrubber presented according to the plate 2/2 (their profile and their size can vary and their quantity also according to the product to burn). intervene in the layer in active combustion from front to back or vice versa and possibly from right to left and vice versa. Their role is to plow the layer in combustion in order to clear the air injection orifices for combustion air from the nozzles, to convey the slabs of slag or powdery ash to the arrangement of the ashtray1 represented according to plate 1/2 to the rear (9). It should be noted that on return the fingers of the scraper retract in action going towards the ashtray, they are held by the stop (25).

The scouring device according to the invention is actuated by means of two angular action connecting rods. They are actuated by means of two cylinders (4). However, there is nothing to prevent them from being actuated by geared motors, since the invention relates to the equipment inside the combustion chamber. The drive of the scraper, object of the present invention is ensured by the point and the two specially fitted connecting rods (3) on the axis of the two yokes fixed on the plane of the screw hearth (6).

The longitudinal guides (7) provide the scope of action for the scavenger according to the invention over the entire base surface of the hearth.

The advantage of the scourer according to the invention is that it is cooled by the excess combustion air.

The characteristic of the invention relates to the action of scouring inside the boiler hearth and screw burner in action without interruption of service, as is currently the case in manual mode. The present invention eliminates any manual intervention often generating arduous and dangerous work with the risks that they involve. From the invention presented, automation can be achieved at 100%.

The present invention also provides a considerable advantage: while ensuring the cooling of the scrubber mechanism, the air blown through the orifices provided for this purpose (8) contributes to improving the weight index of the combustion while allowing ue to continue the combustion of particles in retentIon contained in the gases of the first course, thus allowing the purification of the fumes of all undesirable waste towards the atmosphere thus by bringing the economy in certain cases on the investment of a filter for fumes .

The main invention of the present invention is to continue the construction of thermal appliances intended for the use of: various coals produced by
Ponds from around the world, various plant waste, waste due to the rejection of household waste on the niche of powers between 10 to 30 Omega watts. To conclude, in the context of renewable energies, the various industrial wastes with which the European Company in a few years will be saturated.

Conclusion: The present invention will make it possible to reasonably use, as fuel on traditional installations, a large proportion of waste from industrial multi-sources without particular concern for the constraints which could arise without the contribution of the present invention.

Claims (9)

 1) Device to ensure scrubbing in  improvement of secondary combustion and weight index.  which is blown with air for cooling and  on two guides (7) having orifices (8) in  cross member fitted with sliding fingers (1)  housewives etc ...). Characterized in that it comprises a  coals, plant and industrial waste, garbage  automatic multi-fuel screw burners (various  2) Device according to claim 1 characterized in that  that the crosspiece (1) moves through two  connecting rods (3) actuated by two cylinders or geared motors  (4), the fixed anchor point (5) is articulated for the  transfer of effort by the two hollow yokes (6) to  the coupling of the connecting rods (3) to the crosspiece (1) and allows the transfer of angular movement into linear movement.  3) Device according to claim 1 or claim 2 characterized in that (kills the crosspiece (1) ensures a scrub on the entire base surface of the hearth, the guides (7) are equipped with calibrated blowing orifices (8 ) to allow combustion of unburnt particles retained in the smoke.  4) Device according to any one of the preceding claims, characterized in that the slag is conveyed by the crosspiece (1) provided with must (2), to a damping ashtray (9) provided with a slag removal screw (10 ).  5) Device according to any one of the preceding claims, characterized in that the cross-member (1) is equipped with fingers (2) provided with a stop (25), the retraction on the return being effected by an axis (23) .  6) Device according to any one of the preceding claims characterized in that the fingers can be in more or less quantity (2), the moldboard can have various profiles; 221.  7) Device according to any one of the preceding claims, characterized in that the interior scourer allows 100% automation of a burning installation from solid fuels or industry waste.  8) Device according to any one of the preceding claims, characterized in that the base supports the boiler (60), the boxes 15 and 16, receive the air intended for the nozzles (18), the boxes 13 and li, receive the air intended for the @eu of plates composing the hearth of the hearth (19), the supply screw 17, conveys the fuel to the hearth tank with set of nozzles (18).  9) Device according to any one of the preceding claims, characterized in that the action travel of the cross-member (1), perhaps limited before the ashtray (9), this zone offset before the ashtray (9), allows in in the case of certain fuels, to complete the combustion on the set of clinker plates, at this place where the ventilation is reinforced (19), thus improving the inertia of the hearth and the fumivity.