FI113782B - Sealing the hatch between the solid fuel supply system and the combustion chamber - Google Patents

Abstract

A seal mechanism for a gate valve (3) operable between a solid fuel feed system (1) and a combustion space (3), such as a gas generator combustion chamber, the fuel feed system comprising a hopper (1) having at least its bottom end portion shaped substantially cylindrical, whereby gate valve (3) controls the discharge opening of the hopper bottom end, and the open/closed positions of the gate valve being controllable by means of a gate valve actuator mechanism (5, 6) in such a fashion that a seal is provided between the bottom end (4) of hopper (1) and gate valve plate (3). The invention is imple­mented by way of providing the lower edge of hopper (1) with a sealing member (4) whose edge facing the gate valve plate (3) is annular and is sharpened substantially over its entire circumferential length.

Description

113782

COMBINATION OF THE SOLID FUEL SUPPLY SYSTEM AND THE PALOTHA DOOR

The present invention relates to a sealing of a hatch between a solid fuel supply system and a combustion chamber, for example a gas generator combustion chamber, which comprises a supply funnel which is at least at its lower end substantially cylindrical and closed by said hatch in its bottom opening. by a movable transfer mechanism 10 formed between the lower edge of the hopper and the hatch.

Power plants and heating plants that supply solid fuels to the combustion chamber require a close separation between the combustion chamber, for example the gas generator combustion chamber, and the fuel supply system after supply, for reasons of process and safety. This isolation is in most cases difficult, since fuel residues such as chips, peat bundles or the like may remain on the sealing surfaces to impede complete sealing. The high temperature of the combustion chamber also places high demands on sealing.

Known hatches usually operate in that they are hinged and pivotable downwards when the hatch is opened and upwards when the hatch is closed.

: · When closing the hatch, there may be solid fuel residue between the hatch and its contact surface. In this case, the door will not close tightly.

. ·. · 25 Also known as hatch solutions where the hatch is pushed from the side to the slots. However, here is the same problem as in the previous solution, that is, the solid fuel blocks prevent the hatch from fitting tightly.

Various prior art sealing mechanisms are disclosed, for example, in DE-AS 1132676, DE-PS 671726 and Fl patent application 782276. however, the above-mentioned drawbacks apply to the solutions presented herein.

An object of the present invention is to provide a novel sealing arrangement 35 between a solid fuel supply system and a combustion chamber. The seal according to the invention is characterized in that at the bottom of the hopper a sealing member is provided, the edge facing the hatch of which is circular and substantially sharp throughout.

Another embodiment of the seal according to the invention is characterized in that the sealing member is a sealing ring removably attached to the lower part of the hopper.

Another advantageous embodiment of the seal according to the invention is characterized in that the sealing ring is made of metal.

10

Another advantageous embodiment of the invention is characterized in that the hatch is arranged by its transfer mechanism to be initially lowered slightly downward from the closed position and subsequently pivoted to release the hopper opening, and that the hatch closure is arranged in the reverse order.

An advantage of the invention is that the fuel residue which may remain between the door and the sealing edge is cut off by the sharp sealing edge and the door can be sealed tightly. The door is preferably moved hydraulically so that sufficient force is applied between the door. not to cut the pieces of fuel.

In the following, the invention will be explained in more detail in a preferred embodiment: •. By means of a case study, with reference to the accompanying drawings, in which:. Figure 1 schematically illustrates a solid fuel inlet hopper with a hatch under it and a combustion chamber under the hatch, with the hatch closed.

Figure 2 shows the same as figure but with the door open slightly.

Figure 3 schematically illustrates, from below the hopper, a situation in which the hatch is opened, i.e. completely turned aside under the hopper opening .... ·.

! 35; 1 shows a solid fuel feed hopper with reference numeral 1, at least at its lower end being substantially cylindrical, through which fuel 3 113782 is further fed by its burns 2. Between the feed hopper 1 mounted on the feeder body 8 and the combustion chamber 2 is a circular cylindrical feed hopper. hatch 3. The purpose of hatch 3 is to seal the fuel supply system and combustion chamber tightly.

5

An annular sealing member is formed or attached to the lower part of the hopper, the lower edge of which narrows downwards to form a sharp circular contact surface with the closed door 3. The sealing member 4 is made of metal so it has a very long life compared to conventional seals. 10 If the sealing member is a removable sealing ring, it may be removed and re-machined if necessary.

Reference numerals 5 and 6 illustrate a mechanism for moving the door 3 for opening and closing the door. In Fig. 1, the hatch 3 is tightly closed with the sharp edge of the sealing ring 15 against the hatch 3. When the door is opened, it is first lowered slightly downwards from the sealing ring 4 by the transfer mechanism 5, 6, as shown in Fig. 2. It is then further rotated by the same mechanism to the position shown in Fig. 3, where it is completely removed from the hopper 1 and the solid fuel drops from the hopper 1 20 with its burns 3. As the door 3 pivots, its upper face strikes the scraper iron 7 .

When the door 3 is closed, it is rotated again from the position shown in Fig. 2 to the horizontal position under the hopper 1. During this movement the formula 25 iron 7 again cleans the upper surface of the door 3. When the hatch is correctly positioned below the hopper 1, it is lifted against the sealing ring 4 with a force such as hydraulically provided that any remaining impurities in the top of the hatch are cut off by the sharp edge of the sealing ring and sealed.

It will be apparent to one skilled in the art that the invention is not limited to the embodiments set forth above, but may be varied within the scope of the appended claims.

Claims (4)

4, 113782 A seal (3) between a solid fuel supply system (1) and a combustion chamber (3), for example 5 gas generator combustion chambers, the supply system comprising a supply funnel (1) substantially at least lower at its lower end and said opening in the bottom (3) closes and which door can be opened and closed by means of a moving transfer mechanism (5, 6) formed between the lower edge (4) of the hopper (1) and the door (3) of 10, characterized in that the lower edge of the hopper (1) is a sealing member (4) having an edge facing the hatch (3) which is circular and substantially sharp throughout. 2. The patent patent application No. 1, the turn-off device (4) 15 the device (1) nedre del lostagbart fästbar tätningsring. Sealing according to claim 1, characterized in that the sealing member (4) is removable at the bottom of the hopper (1)! attachable sealing ring. Sealing according to claim 1 or 2, characterized in that the sealing ring (4) is made of metal. 20 Sealing according to one of Claims 1 to 3, characterized in that the hatch (3) is arranged by its transfer mechanism (5, 6) to be first lowered slightly downwards from the closed position and subsequently pivoted to release the opening of the hopper (1); the closure is arranged to occur in the reverse order. Sealing according to one of Claims 1 to 4, characterized in that an elongated scrap iron (7) is attached to the opening direction of the hatch (3) adjacent to the sealing edge (4) and cleans the upper surface of the hatch as it passes under the iron. • »• · 113782 1 .Testning av en lucka (3) mellan et matningssystem for fast bränsle (1) och et förbränningsutrymme (3), säsom en gasgenerators förbränningsutrymme, flashes 5 matningssystem omfattar en matningstratten (1) som är väsentlig sin botten, varvid such lucka (3) tillsluter en öppning i dess botten, och vilken lucka kan öppnas och stängas med hjälp av en förflyttningsmekanism (5, 6) som förflyttar den, vilken tätning bildas mellan matningstrattens (4) nedre kant (4) och luckan (3), leaning lugs (3), leaning lugs (3), coloring lugs (3), coloring lugs (3), coloring lenses (3), coloring lenses (3), coloring lenses (3), and cirkelforming och skarp väsentligen över hela sträckan. 3. Tätning enligt patentkrav 1 eller 2, the turning tongs opening the tätningsringen (4) and the metal. 20 4. Tätning enligt face av patentkraven 1-3, kännetecknad avatt luck an (3) anordnad att med hjälp av sin förflyttningsmekanism (5,6) först släp-it: pas litet nedän frän sitt stängda och att därefter vridas at sidan för · av öppningen i matningstratten (1), och att stängningen av luckan (3) är anord- 'j'; nad att ske i motsatt ordning. ': 25: 6. Tätning enligt face av patentkraven 1-4, kanknetecknad av att bred-' · | vid tätningskanten (4). i luckans (3) öppningsriktning, är fäst et längsträckt skavjärn (7) som putsar luckans övre yta när den gär under järnet. I · »ί I» »* I I> ± I