PL150407B1 - Gas distribution apparatus for vortex layer furnaces - Google Patents

Abstract

The gas distribution apparatus for fluidised-bed furnaces has a movable, sealed gas distribution chamber (1), through which leads a pipe (5) for gas feed into the interior of a distributor (6). The distributor (6) is a bushing (7) closed at the top, which is attached to the base (4) of the gas distribution chamber (1). Orifices for the gas are provided in the upper part of the bushing (7). The tube (8) from the interior of the distributor (6) extends through a side orifice in the bushing (7) into the working space (9) of the fluidised-bed furnace (10) situated above the gas distribution grid (2). The pipe (5) for the gas feed extends through an orifice, which is furnished with a stuffing box seal (18), in the base (15) of the fluidised-bed furnace (10). Guide pins (14) are mounted on the base (4) of the gas distribution chamber (1), which guide pins are provided with assembly rods (22). Bushings (16), sealed by rings (21), are provided coaxially to the guide pins (14) on the base (15) of the fludised-bed furnace (10). The gas distribution apparatus has minimal losses of the gas fed for the fluidised-bed formation. Out of operation, no gas needs to be fed to cool the seal. Mounting and demounting the gas distribution chamber (1) are simplified. <IMAGE>

Description

REPUBLIC

POLAND

PATENT DESCRIPTION 150 407 Additional patent to patent no. --- READING ROOM Potemow Office ^ qo Ν »·· ι 1? · · <* · · ♦. Reported: 86 12 16 / P. 263024 / Priority: 85 12 24 Bulgaria Int. Cl. ⁵ F27B 15/10

OFFICE

PATENT

RP

Application announced: 87 10 19

The patent description was published: 90 07 31

Creators of the invention: Magdalena Georgieva Petrunova, Nikolai Djenev Tolev,

Keham Garabed Mamasjan, Rafi Toros Garabedjan, Maria Dejanova Georgieva

The right holder of the patent: Zentralen Maschinostroitelen Institut, Sofia / Bulgaria /

GAS DISTRIBUTION DEVICE FOR FLUIDIZATION STOVES

The subject of the invention is a device for gas separation for fluidized bed furnaces, which can be used in the production of devices in machine building for thermal and chemical treatment and for other technological processes as well as in other industries. A gas separation device for thermal and thermo-chemical treatment is known, comprising a gas separation grid which is mounted on the retort of a fluidized bed furnace and separates the furnace space from the gas chamber of the retort. The gas dividing grate is movably arranged on a flange which is fixedly and hermetically attached to the retort. The gas dividing grate is pressed against an element positioned between the flange and the grate. Another known gas separation device for fluidized bed furnaces is known to include more than one movable gas separation chamber. The top walls of each mobile gas separation chamber are perforated and their bottoms are at the bottom of the furnace retort.

At each mobile gas separation chamber, a pipe is provided for the process gas supply which terminates inside the gas separation chamber with a divider. The movable gas separation chambers are arranged in parallel, opposite each other, each chamber being sealed against the adjacent side wall of the furnace retort.

The main disadvantage of the above-described known gas separation devices is the high gas loss in the production of the fluidized bed due to the poor sealing between the gas separation grid and the retort due to the large sealing area. Other disadvantages include the need to supply gas to produce vortices also during non-working hours to cool the seal due to the risk of burning it, as well as the difficult assembly and disassembly of the gas separation device to clean the grate, and the need for an additional heating installation for the production of steam in the processes of oxidation and oxygen nitriding in chemothermal treatment.

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The object of the invention is to provide a gas separation device for swirl layer furnaces in which the gas losses for the formation of the vortex layer are kept to a minimum, in which the seal between the gas separation grate and the furnace retort is improved, and in which the gas supply to create vortices is removed. during the hours without work to cool the seal, and in which the conditions of assembly and disassembly of the grating for cleaning will be improved. This task is solved by a gas separation device for vortex layer furnaces, consisting of a movable and hermetically constructed gas separation chamber, the top wall of which is a gas separation grid and the bottom of which is placed at the bottom of the furnace retort. A pipe is provided for the supply of process gas to the mobile gas separation chamber. The process gas supply line terminates inside the gas separation chamber with a divider. According to the invention, the distributor is designed as a sleeve closed at the top, fixedly mounted on the bottom of the gas separation chamber. There are perforated holes for process gas in the upper part of the sleeve. An opening is provided on the side of the sleeve to connect the inner space of the divider with the combustion space of the retort above the grate for the supply of steam. The pipeline for the process gas supply runs through the opening in the bottom of the retort, in which a gland seal is made.

According to another embodiment of the subject matter of the invention, at the bottom of the gas distribution chamber, guide pins for which mounting rods are provided are arranged. In the bottom of the retort, there are sleeves sealed with metal rings coaxially with the guide pins. According to the invention, the main advantage of the fluidising furnace gas separation device is the minimization of time losses in the production of the vortex layer due to the improved sealing between the gas separation chamber and the load bearing retort bottom, since a minimum sealing area is ensured by the use of a gland seal. Process gas losses will be reduced also because no gas is supplied during idle hours to cool the seal. By using the proposed gas separation device according to the invention, the assembly and disassembly conditions for cleaning the grate are improved, and the need for an additional heating device for generating steam in the oxidation and oxygen nitriding processes in chemical-thermal treatment is eliminated.

The subject of the invention is explained in more detail in an embodiment in the drawing which shows a retort of a fluidized bed furnace with a gas separation device in a partial axial section. The gas separation device comprises a hermetically constructed gas separation chamber 1, the top wall of which represents the gas separation grid 2. The gas distribution grid 2 is mounted on the cylinder 3, on the lower side of which there is a bottom 4 with a central hole. On the outside of the bottom 4, a pipe 5 is arranged in the central opening for the process gas supply, and on the inside, a stationary distributor 6 is attached to the bottom. The distributor 6 is designed as a closed sleeve 7 at the top, in the upper part of which holes are perforated for process gas separation. On the side of the sleeve 7 there is provided an opening to which the pipe 8 is led, which connects the inner space of the distributor 6 with the working space 9 of the furnace retort 10 with the vortex layer above the grate. The pipe 8 is also connected to the gas distribution grate 2 in which a through hole is provided. Along the pipe 8, a hose 11 is mounted on the upper end of the gas distributor grate, ending at its upper end with a needle valve 12. A bow 13 is attached centrally to the gas distributing grate 2. Radially disposed guide pins 14 with blind threaded holes are provided on the outside of the bottom 4. The gas separation chamber 1 is detachably located at the bottom 15 of the retort 10, which is formed with a central conical opening and three radially arranged conical openings coaxial with the guide pins 14 of the gas separation chamber 1. From the outside, the retorts 10 are mounted in the bottom 15, inseparably in the conical holes, the sleeves 16, and the gland sleeve 17 is hermetically connected to the conical central hole, through which the movement conduit 5 passes for the process gas supply to the gas separation chamber 1. A gland packing 18 and a screw-in gland 19 of the gland bushing are provided on the stuffing box 17.

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In the working stage, the guide pins 14 of the gas separation chambers 1 are fixed in sleeves 16 on the bottom 15 of the retort 10. Bolts 20 are screwed into the guide pins 14, which seal the sleeves 16 by means of aluminum rings 21. For disassembly, they are provided for connection to the guide zigzags. 14, mounting rods 22 replacing shots 20.

The gas separation device works as follows: In the operating state, process gas is fed to the pipe 5, which fills the gas separation chamber 1, the gas flowing through the perforated openings of the distributor 6. From the gas distributor chamber 1 the gas passes through the gas separation grid 2 evenly. the fluidization furnace retort 10 located above the grate 9, the gas fluidizing the fine-grained material 23 therein. During the oxidation and oxygen nitriding processes in the thermo-chemical treatment, water is supplied through a needle valve 12 and a hose 11, which evaporates due to the working temperature of the fine-grained material. The generated steam enters the manifold 6 through the pipe 8 and, together with the remaining process gases, is led through the gas separation grid 2 to the working space located above the grid.

When disassembling the device for cleaning the gas distribution grate 2, the screws 20 and the gland 19 »are unscrewed, then the aluminum rings 21 and gland seals 18 are put aside, and the mounting rods 22 are screwed into the guide pins 14, and then removed by means of the hoop 13 a gas separation chamber 1 from the retort 10 of the fluidized bed furnace. When assembling, these steps are performed in reverse order to place the gas separation chamber 1 at the bottom 15 of the retort 10.

Claims (2)

Patent claims 1.Gas separation device for fluidized bed furnaces, consisting of a detachable, hermetically constructed gas separation chamber, the top wall of which represents the gas separation grid, while its bottom is located at the bottom of the furnace retort, and is connected to the device at the moving chamber gas separation, a pipe for supplying process gas ending inside the gas separation chamber with a divider, characterized in that the distributor / 6 / is made as a closed sleeve from above / 7 / which is permanently mounted on the bottom / 4 / chambers / 1 / gas, while in the upper part of rulei / 7 / there are perforated openings for the process gas, while on the side there is an opening for connection through the pipe / 8 / the inner space of the manifold / 6 / with the working space / 9 / retorts above the grate / 10 / and in which a conduit / 5 / for supplying the process gas runs through an opening in the bottom / 15 / retorts / 10 / with a gland seal / 18 /. 2. The device according to claim 1, characterized in that guide pins / 14 / are mounted on the bottom / 4 / chambers / 1 / in which mounting rods / 22t are mounted, and on the bottom / 15 / retorts / 10 / are mounted coaxially with the guide pins / 14 / sleeves / 16 / sealed with rings / 21 /. 150 407 Printing House of the Polish Patent Office. Circulation 100 copies. Price 1500 PLN