CZ304499B6 - Lump fuel dosing device, particularly pellet dosing device for high-pressure gasification apparatus - Google Patents

Abstract

In the present invention, there is disclosed a lump fuel dosing device, particularly pellet dosing device for high-pressure gasification apparatus comprising an inlet worm (1) with an inlet port (10), a first chamber (12) with a first piston (3) slidably mounted therein. Said first chamber (12) inlet port is connected to the outlet port of the inlet worm (1). The dosing device further comprising a second chamber (13) with a second piston (7) slidably mounted therein, and an intermediate chamber (8) interconnecting said first chamber (12) with the second chamber (13), whereby the first piston (3) is shiftable from a position in which it closes a passage from the inlet worm (1) into the first chamber (12) and passage from the first chamber (12) into the intermediate chamber (8), to a position, in which both these passages are open, and vice versa, while the other piston (7) is shiftable from a position in which it closes the passage between the intermediate chamber (8) and the second chamber (13) and the outlet of the second chamber (13) to a position, in which the passage between the intermediate chamber (8) and the second chamber (13) as wall as the outlet port of the second chamber (13) are open, and vice versa.

Description

Bulk fuel dispenser, especially pellets, for high pressure gasification equipment

Technical field

The invention relates to a lump fuel dispenser, in particular pellets, for a high pressure gasification apparatus.

BACKGROUND OF THE INVENTION

Feeding fuel in the form of pellets into high-pressure gasification equipment is problematic because it is necessary to separate the fuel supply from the gasification or combustion space, but above all to seal the space in terms of pressure leakage from the process or suction of unnecessary (false) air. The high pressure gasification apparatus is used, for example, for gasification of biomass with subsequent combustion of pyrolysis gas. Currently, turnstiles are mainly used for the above dosages. Their disadvantage is, in particular, that they cannot be designed with a seal of 3.5 to 4.5 bar (0.35 to 0.45 MPa) of overpressure in the combustion or gasification space.

SUMMARY OF THE INVENTION

The aforementioned drawbacks of the prior art are largely eliminated by a lump fuel dispenser, in particular pellets, for a high-pressure gasification plant, which according to the invention comprises an inlet screw with an inlet, a first chamber in which the first piston is slidably mounted and connected by its inlet at the outlet of the inlet auger, a second chamber in which the second piston is slidably received, and an intermediate chamber connecting the first chamber to the second chamber, the first piston being movable from a position in which it closes the passage from the inlet screw to the first chamber and the passage from the first chamber to the intermediate chamber , to a position in which the passages are open and back, while the second piston is movable from a position in which it closes the passage between the intermediate chamber and the second chamber and the outlet opening of the second chamber to a position in which the passage is between the intermediate chamber and the second chamber; outlet of the second chamber, open, and back.

Preferably, the first piston is cylindrical and has a sealing ring and a wiper ring near its periphery and / or the second piston is cylindrical and a sealing ring and a wiper ring near its periphery.

In a particularly preferred embodiment, the first chamber and the second chamber are cylindrical and arranged vertically, while the intermediate chamber is arranged obliquely therebetween. The passage between the first chamber and the intermediate chamber is then preferably arranged higher than the passage between the intermediate chamber and the second chamber. The passage between the intermediate chamber and the second chamber is then again preferably arranged higher than the outlet opening of the second chamber.

In order to move the first and second pistons, the first piston may be connected to the first hydraulic drive and the second piston to the second hydraulic drive.

It may also be advantageous to supplement the dispenser of the invention with an outlet screw which is connected to the outlet opening of the second chamber by its inlet opening.

Overview of the figure in the drawing

An exemplary embodiment of the invention is shown in the drawing of FIG. 1 in a front view, the hidden parts being indicated by a broken line.

-1 CZ 304499 B6

DETAILED DESCRIPTION OF THE INVENTION

As can be seen from FIG. 1, the lump fuel dispenser according to the invention comprises an inlet screw 1 for feeding the dispensed material. The inlet auger 1 is provided with a drive 2 and has an inlet 10 and an outlet connected to a first chamber 12 in which a first piston 3 is slidably mounted connected to a first hydraulic drive 6 via a first piston rod 14. The first piston 3 is cylindrical and relative to the walls of the first chamber 12 is provided with a sealing ring 4 and a wiper ring 5 at its periphery near its working face. The working face of the first piston 3 faces the inlet opening of the first chamber 12.

Further, the dispenser comprises a second chamber 13 which is connected to the first chamber 12 via an intermediate chamber 8. In the second chamber 13 a second piston 7 is slidably mounted connected to the second hydraulic drive 16 via a second piston rod 16. The outlet opening of the second chamber 13 is connected to an inlet port of an outlet screw 9, the outlet port of which is connected to an inlet port 11 of a gasification device (not shown). However, it is also possible to omit the outlet screw 9 and to connect the second chamber 13 directly to the inlet opening 11 of the gasifier. The second piston 7 is as close as possible to the walls of the second chamber 13, moreover, like the first piston 3, it is provided with a sealing ring 17 and a wiper ring 1.8. The working face of the second piston 7 faces the outlet opening of the second chamber 13.

Alternatively or additionally, instead of the sealing rings 4, 17 and the wiper rings 5, 18, a corresponding seal may be provided in the walls of the first chamber 12, respectively. the second chamber 13, along their inner circumference in the region of the inlet opening to the first chamber 12, respectively. in the region of the outlet opening from the second chamber 13.

Alternatively, the inlet screw 1 may also be replaced by a feed chamber in which the feed piston is slidably mounted and whose outlet is connected to the inlet opening of the first chamber 12 (not shown).

The dispenser operates as follows: The first piston 3 is set in a lower position distant from the inlet opening to the first chamber 12. The second piston 7 is also set in its lower position near the outlet opening of the second chamber 13. The inlet 10 brings the pellets into the inlet auger 1. The drive 2 of the inlet auger 1 is started and the pellets with the inlet auger 1 are moved into the first chamber 12 and therefrom into the intermediate chamber 8. After the intermediate chamber 8 is filled. by means of the first hydraulic drive 6 it moves to its upper limit position near the inlet opening to the first chamber 12, with its walls closing the entrance to the intermediate chamber 8 and the sealing ring 4 and the wiper ring 5 to seal the space of the intermediate chamber 8 with the second hydraulic drive 16 moves to its upper position distant from the outlet opening of the second chamber 13, thereby releasing the inlet opening of the second chamber 13, and the pellets collected in the interspace 8 reach the second chamber 13 from where they fall into the outlet screw 9 the inlet opening 11 of the gasification device. Thereafter, the first piston 3 and the second piston 7 are moved to their lower positions and the entire cycle described above can be repeated.

Claims (8)

PATENT CLAIMS A lump fuel dispenser, in particular a pellet, for a high pressure gasification apparatus, further comprising a first chamber (12) in which the first piston (3) is slidably received and which has an inlet opening, a second chamber (13), a second piston (7) and an intermediate chamber (8) interconnecting the first chamber (12) with the second chamber (13), the first piston (3) being movable from a position in which it closes the inlet opening to the first chamber (12) ) and the passage from the first chamber (12) to the intermediate chamber (8), to the position in which the inlet opening and the passage are open and back, while the second piston (7) is movable from the position in which it closes the passage between the intermediate chamber (8) ) and the second chamber (13) and the outlet of the second chamber (13) to a position in which the passage between the intermediate chamber (8) and the second chamber (13) and the outlet of the second chamber (13) are open and back. Dispenser according to claim 1, characterized in that the first piston (3) is cylindrical and has a sealing ring (4) and a scraper ring (5) near its periphery and / or the second piston (7) is cylindrical and provided with a sealing ring (17) and a wiper ring (18) near its periphery. Dispenser according to claim 1 or 2, characterized in that the first chamber (12) and the second chamber (13) are cylindrical and arranged vertically, while the intermediate chamber (8) is arranged obliquely between them. A dispenser according to claim 3, characterized in that the passage between the first chamber (12) and the intermediate chamber (8) is arranged higher than the passage between the intermediate chamber (8) and the second chamber (13). Dispenser according to claim 3 or 4, characterized in that the passage between the intermediate chamber (8) and the second chamber (13) is arranged higher than the outlet opening of the second chamber (13). A dispenser according to any one of the preceding claims, characterized in that it comprises an inlet screw (1) with an inlet (10) and an outlet which is connected to the inlet opening of the first chamber (12). A dispenser according to any one of the preceding claims, characterized in that the first piston (3) is connected to the first hydraulic drive (6) and the second piston (7) is connected to the second hydraulic drive (16). Dispenser according to any one of the preceding claims, characterized in that it further comprises an outlet screw (9) which is connected by its inlet to the outlet of the second chamber (13).