A gas sealing device for a dryer hub and a firebox

Abstract

The present invention discloses a dryer hub and firebox gas sealing device, which comprises: a hub 1, a graphite sealing device 2, a pressure plate 3, a ring plate 4, a short section 5, an upper semicircular main pipe 6, a small pipe 7, a firebox 8, a lower semicircular main pipe 9, and a support plate 10. The sealing device adds a gas seal between the original sealing device and the firebox 8, effectively solving the problem of the graphite sealing device 2 being burned due to "cross-fire" of the firebox, preventing waste of tail gas and air pollution.

Description

Technical Field

[0001] The invention relates to a sealing device between a dryer hub and a fire box. Background Art

[0002] For many years, the drying equipment widely used in the carbon black industry is composed of a dryer hub and a firebox. The drying process is as follows: the high-temperature exhaust gas enters the space between the firebox and the dryer hub from port a, heats the hub, and then flows out from the exhaust gas return port c. 1-3 Enter the hub; wet materials enter the dryer hub from port f and mix with the high-temperature exhaust gas in the hub through the lifting plate, and then go out from port g after drying; the cooled exhaust gas goes out from port b, and the whole process achieves the purpose of drying the wet materials. Spring sheets are generally used to seal the rotating hub and the fixed firebox. The hub cylinder is thin-walled and large-diameter, and the length is generally about 18 meters. The length of the firebox is about 15 meters. The rigidity of the hub is poor and affected by its ellipticity. Vertical jumps will occur during the rotation process. Although the firebox is in a slightly negative pressure atmosphere, as the equipment runs, the overlapping spring sheets will deform and gaps will appear, causing high-temperature exhaust gas to leak from the seal. When it encounters air, it will catch fire, commonly known as "fire string", which brings safety hazards to equipment and personnel and pollutes the air. Therefore, the seal between the firebox and the hub is particularly important. After investigation, a gas sealing device was designed and developed to effectively eliminate the adverse effects of exhaust gas leakage, and also prevent exhaust gas leakage from causing a decrease in drying effect and waste of exhaust gas. Summary of the invention

[0003] The present invention aims to design a gas sealing device, the technical solution adopted by the sealing device is:

[0004] A dryer hub and firebox gas sealing device, comprising: a hub 1, a graphite sealing device 2, a pressure plate 3, a ring plate 4, a short section 5, an upper semicircular main pipe 6, a small pipe 7, a firebox 8, a lower semicircular main pipe 9, and a support plate 10, characterized in that: a short section (5) is welded to the ring plate (4) at the two end faces of the firebox (8), and the graphite sealing device (2) is connected to the ring plate (4) at one end of the short section (5); a plurality of pipe holes are opened in the circumferential direction of the short section (5); an annular air inlet main pipe is formed by the upper semicircular main pipe (6) and the lower semicircular main pipe (9) and is connected to the short section (5) through a plurality of small pipes (7); and the annular air inlet main pipe is supported by a plurality of support plates (10) welded to the end faces of the firebox (8). The sealing process is as follows: a stream of waste gas is introduced from the bag filter into the d 1-2The air enters the additional sealed annular air inlet pipe through the small pipe (7), enters the annular space formed by the short section (5), the end surface of the firebox (8) and the ring plate (4), and finally enters the firebox (8) through the gap between the firebox (8) and the rotating hub (1) to collect the high-temperature exhaust gas. The innovative and improved sealing structure of the firebox (8) and the rotating hub (1) effectively solves the problem of the graphite sealing device (2) being burned due to "cross-fire" in the firebox, and prevents the waste of exhaust gas and air pollution.

[0005] The design points of the present invention are:

[0006] 1. The firebox and the hub are sealed with a combination of gas and graphite;

[0007] 2. Add a gas sealing pipe system between the graphite sealing device and the fire box;

[0008] 3. Draw a stream of gas from the bag filter into the pipe system;

[0009] 4. The introduced gas flows to the firebox with a slight negative pressure and merges with the exhaust gas entering the firebox;

[0010] 5. The graphite sealing device is directly connected to the end plate of the piping system.

[0011] The advantages of the present invention are:

[0012] 1. The gas seal is not affected by the deformation of the hub, achieving a good gapless sealing effect;

[0013] 2. Effectively solved the problem of fire box "cross-fire" burning graphite sealing device;

[0014] 3. The introduced gas directly enters the firebox and merges with the high-temperature exhaust gas, and then enters the rotor to mix with the wet material;

[0015] 4. The gaps between the hub and the firebox, and between the graphite seal and the hub are sealed by gas, without wear and leakage;

[0016] 5. There is no leakage of high-temperature tail gas, the wet material drying effect is good and efficient, and the heat energy loss of the tail gas furnace is effectively reduced;

[0017] 6. Effectively improve the service life of graphite sealing devices, extend the cycle of replacing sealing wearing parts, and reduce maintenance costs; 7. While reducing production costs, it also eliminates air pollution caused by exhaust gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a gas sealing device for a dryer hub and a firebox according to the present invention

[0019] Figure 2 for Figure 1 AA View

[0020] Markings in the figure: 1-hub, 2-graphite sealing device, 3-pressure plate, 4-ring plate, 5-short section, 6-upper semicircular main pipe, 7-small pipe, 8-firebox, 9-lower semicircular main pipe, 10-support plate.

[0021] a-exhaust gas inlet, b-exhaust gas outlet, c- 1-3 - Exhaust gas reflow port, d 1-2 - Exhaust gas inlet, e 1-2 - sewage outlet, f-wet material inlet, g-dry material outlet DETAILED DESCRIPTION

[0022] A dryer hub and firebox exhaust gas sealing device comprises: a hub 1, a graphite sealing device 2, a pressure plate 3, a ring plate 4, a short section 5, an upper semicircular main pipe 6, a small pipe 7, a firebox 8, a lower semicircular main pipe 9, and a support plate 10.

[0023] Specific implementation process:

[0024] 1. Manufacturing parts: upper semicircular main pipe 6 and exhaust gas inlet d 1-2 The pipe and the connecting flange are welded to form a semicircular air inlet pipe, and 7 small pipes are opened; the lower half pipe 9 is connected to the sewage outlet e 1-2 The pipe and the connecting flange are welded to form a semicircular air inlet main pipe, and 7 small pipe openings are opened; the rolled short section 5 and the ring plate 4 are welded to form an annular assembly, and 7 small pipe openings are opened;

[0025] 2. Weld the annular assembly to the end plate of the firebox 8;

[0026] 3. The small pipe 7 is welded to the upper semicircular main pipe 6, the lower semicircular main pipe 9 and the annular assembly respectively;

[0027] 4. The upper semicircular main pipe 6 and the lower semicircular main pipe 9 are connected as a whole by bolts to form an integral air intake main pipe;

[0028] 5. Install the graphite sealing device 2 between the rotating hub 1 and the firebox 8;

[0029] 6. Use the pressure plate 3 to block the graphite block in the graphite sealing device 2 so that it can remain attached to the rotating hub 1 as the rotating hub 1 jumps in the radial direction, thereby achieving the sealing purpose.

Claims

1. A dryer hub and firebox gas sealing device, comprising: A rotating hub (1), a graphite sealing device (2), a pressure plate (3), a ring plate (4), a short section (5), an upper semicircular main pipe (6), a small pipe connection (7), a fire box (8), a lower semicircular main pipe (9), and a support plate (10), characterized in that: an annular assembly formed by welding the ring plate (4) and the short section (5) is welded to two end surfaces of the fire box (8), and the graphite sealing device (2) is connected to the ring plate (4); a plurality of pipe connection holes are opened in the circumferential direction of the short section (5); the upper semicircular main pipe (6) and the lower semicircular main pipe (9) are bolted together to form an annular air inlet main pipe, which is connected to the short section (5) through a plurality of small pipe connections (7); and the annular air inlet main pipe is supported by a plurality of support plates (10) welded to the end surfaces of the fire box (8).

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