CN111173933A

CN111173933A - Sealing combination device for fixing sealing element of water-cooling airtight box of blast furnace iron-making distributor

Info

Publication number: CN111173933A
Application number: CN202010075273.8A
Authority: CN
Inventors: 蒋治浩; 姚志绵
Original assignee: Beijing Shougang International Engineering Technology Co Ltd
Current assignee: Beijing Shougang International Engineering Technology Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-05-19

Abstract

The utility model provides a fixed sealed composite set of blast furnace ironmaking distributing device water-cooling airtight box sealing member, relates to sealing device technical field, including sealing ring (1), flexible graphite packing (2), flexible graphite packing two (3), packing box (4), metal cladding formula gasket (5), flexible graphite packing three (6), water-cooling chassis (7), three subdivision clamp plates (8), trunnion swivel sleeve (9), three fens packing ring (10), bolt one (11), bolt two (12), bolt three (13). The method has the advantages that the method solves the problem of sealing the poisonous furnace gas with large temperature fluctuation range, namely, the high-temperature high-pressure high-dust content is between 70 ℃ below and 600 ℃ or even higher, the blast furnace gas leaked during the rotary motion of the trunnion rotating sleeve of the distributing device is sealed in three stages, the sealing effect is good, and great convenience is brought to the design of the distributing device transmission device; in addition, the maintenance, disassembly and sealing enhancement effects are good, and a good installation method is provided.

Description

Sealing combination device for fixing sealing element of water-cooling airtight box of blast furnace iron-making distributor

Technical Field

The invention relates to the technical field of sealing devices, in particular to a sealing combination device for fixing a sealing element of a water-cooling airtight box of a blast furnace iron-making distributor, a sealing combination structure of a front labyrinth seal, a packing seal, a lapping surface seal, an extrusion seal and the like and an installation method.

Background

The top of the iron-making blast furnace is a furnace throat conical section, a furnace top steel ring (also called a furnace top flange) is welded on the furnace throat conical section, and the water-cooling airtight box is arranged on the furnace top steel ring. The two are connected by bolts and sealed by metal gaskets. The water-cooling airtight box is positioned at the lowest part of the blast furnace top charging equipment and is directly influenced by high heat of blast furnace temperature heat radiation, the furnace top temperature is about 200-350 ℃ under normal conditions, the temperature is 600 ℃ or even higher under an accident state, in order to protect the equipment and enable the equipment to work normally, heat insulation devices are arranged on the direct contact surface of a trunnion rotating sleeve and high-temperature furnace gas and the lower part of a water-cooling chassis, water cooling devices are arranged in a central throat pipe interlayer and the water-cooling chassis, circulating cooling water forcibly flows in a cooling channel to ensure that the temperature in the water-cooling airtight box is within an allowable range (below 70 ℃). The distribution chute is arranged on the trunnion rotating sleeve and does rotary distribution movement uninterruptedly, the fit between the rotary trunnion rotating sleeve and the fixed central throat pipe as well as the rotary trunnion rotating sleeve and the fixed water-cooling chassis is provided with larger gaps for the requirement of temperature difference deformation, the sealing of the toxic dust-containing furnace gas with high temperature and high pressure is the key of the design of the water-cooling airtight box, the single rotary sealing is carried out on the outer cylindrical surface of the trunnion rotating sleeve and the inner cylindrical surface of the water-cooling chassis, the installation mode and the installation space are limited, the sealing effect cannot reach the best, meanwhile, the inconvenience is brought to the design of a transmission device, and the reverse balance sealing amount of nitrogen is increased.

Disclosure of Invention

The invention aims to provide a sealing combination device for fixing a sealing element of a water-cooling airtight box of a blast furnace iron-making distributor, which solves the problems that the sealing installation mode and the installation space are limited by adopting single rotary sealing on the outer cylindrical surface of a trunnion rotating sleeve, the sealing effect cannot be optimal, the design of a transmission device is inconvenient and the like, and forms a sealing combination structure and is convenient to install.

The invention adopts the preposed labyrinth seal, the packing seal, the lapping surface seal and the extrusion seal to seal the blast furnace gas in three stages.

The invention comprises the following steps: the flexible graphite packing device comprises a sealing ring 1, a flexible graphite packing I2, a flexible graphite packing II 3, a stuffing box 4, a metal-coated gasket 5, a flexible graphite packing III 6, a water-cooling chassis 7, a three-split pressure plate 8, a trunnion rotating sleeve 9, a three-split washer 10, a bolt I11, a bolt II 12 and a bolt III 13. The water-cooling chassis 7 of the sealing combination device is a fixed component with a rotary inner surface being a cylindrical surface, the center of the cylinder is also the center line of the distributor, the water-cooling chassis is arranged in the furnace top gas area, and the lower surface of the water-cooling chassis is directly contacted with high-temperature and high-pressure furnace gas; the trunnion rotating sleeve 9 is a rotary motion component around the central line of the distributor, the outer cylinder is arranged in a normal-pressure normal-temperature furnace gas sealing area, and the inner cylinder is directly contacted with high-temperature high-pressure furnace gas; enough intermittence is left on the matching surface of the inner cylindrical surface of the fixing part water-cooling chassis 7 and the outer cylindrical surface of the rotary part trunnion rotary sleeve 9 to ensure the rotary motion of the rotary part, and the furnace gas with high temperature and high pressure has the tendency of flowing to the normal temperature and normal pressure area along the gap. The sealing ring 1 is screwed and fixed in one groove of the stuffing box 4 through a first bolt 11, and meanwhile, a flexible graphite packing I2 is tightly pressed at the corner of the groove of the stuffing box 4, a flexible graphite packing II 3 is arranged in the other groove of the stuffing box, and a metal-coated gasket 5 is arranged in a shallow groove of the stuffing box 4; the sealing ring 1, the first flexible graphite packing 2, the second flexible graphite packing 3, the stuffing box 4 and the metal-coated gasket 5 form an assembly part, and the assembly part is fixedly connected to the lower surface of the water-cooling chassis 7 through a second bolt 12 and becomes a fixed part of the sealing element; two groups of flexible graphite packing III 6 are filled in a ring groove of the water-cooling chassis 7 facing to the outer cylindrical surface of the trunnion rotating sleeve 9, a trisection gasket 10 is arranged between the two groups of flexible graphite packing III 6, and the trisection pressing plate 8 is connected and fixed on the water-cooling chassis 7 through a bolt III 13 and simultaneously compresses the flexible graphite packing III 6 to be tightly attached to the outer cylindrical surface of the trunnion rotating sleeve 9. And a small amount or no amount of high-temperature and high-pressure toxic furnace gas in the furnace top furnace gas area enters the furnace gas sealing area at normal temperature and normal pressure through the combined sealing effect of the sealing combination device.

The invention enlarges the range of the shaft surface of the common rotating shaft which is only a single sealing rotating shaft surface, adds the horizontal plane sealing on the basis of the axial rotating sealing, organically combines the two, and carries out three-stage sealing on the blast furnace gas to form a furnace gas sealing area of the distributing device.

The invention has the advantages that the sealing of the poisonous furnace gas with large temperature fluctuation range, namely, the high-temperature high-pressure high-dust content, which is lower than 70 ℃ to 600 ℃ or even higher, is solved, the furnace gas of the blast furnace leaking when the trunnion rotating sleeve of the distributing device rotates is sealed in three stages, the sealing effect is good, and great convenience is brought to the design of the distributing device transmission device; in addition, the maintenance, disassembly and sealing enhancement effects are good, and a good installation method is provided.

Drawings

FIG. 1 is a design diagram of a sealing combination device for fixing a sealing element of a water-cooling airtight box of a blast furnace iron-making distributor. The flexible graphite packing device comprises a sealing ring 1, a flexible graphite packing I2, a flexible graphite packing II 3, a packing box 4, a metal-coated gasket 5, a flexible graphite packing III 6, a water-cooling chassis 7, a trisection pressing plate 8, a trunnion rotating sleeve 9, a trisection gasket 10, a bolt I11, a bolt II 12 and a bolt III 13.

Detailed Description

The invention comprises the following steps: the flexible graphite packing device comprises a sealing ring 1, a flexible graphite packing I2, a flexible graphite packing II 3, a stuffing box 4, a metal-coated gasket 5, a flexible graphite packing III 6, a water-cooling chassis 7, a three-split pressure plate 8, a trunnion rotating sleeve 9, a three-split washer 10, a bolt I11, a bolt II 12 and a bolt III 13.

The three-stage sealing is carried out on the blast furnace gas with high dust content under high temperature and high pressure, the sealing ring 1 and the lower end face of the trunnion rotating sleeve 9 form a labyrinth seal as a front seal of a rear movable seal, a gap exists between the labyrinth seals, the labyrinth seals have no solid contact, do not need lubrication, allow thermal expansion and adapt to the occasions with high temperature, high pressure and high rotating speed. After the toxic furnace gas with high dust content at high temperature and high pressure passes through the labyrinth, the temperature, pressure, leakage amount and smoke dust content of the leaked furnace gas are all reduced due to the labyrinth effect. And in the second stage of sealing, the stuffing box 4, the second flexible graphite packing 3 and the lower end face of the trunnion rotating sleeve 9 form stuffing sealing, after the stuffing sealing, the leakage amount of leaked furnace gas is further reduced, the leaked furnace gas continues to flow after the direction is changed by 90-degree steering, and the temperature and the pressure are further reduced. And in the third stage of sealing, the three-split pressing plate 8, the flexible graphite packing III 6 and the outer cylindrical surface of the trunnion rotating sleeve 9 form extrusion type sealing, the flexible graphite packing III 6 arranged in the groove of the water-cooling chassis 7 is extruded in advance, the generated pressing force can be adjusted by the three-split pressing plate 8 through the using amount of the flexible graphite packing III 6, and after the sealing, the leakage amount of leaked furnace gas is small or zero. The stuffing box 4 is fixedly pressed on the water-cooling chassis through a metal-coated gasket 5 by a second bolt 12 to form a grinding surface seal, the seal is reliable, and the stuffing box and the water-cooling chassis 7 form a fixing piece together without rotating. The sealing ring 1 is fixedly connected with the stuffing box 4 through a bolt I11, and meanwhile, furnace gas cannot leak from the joint surface of the stuffing box 4 and the sealing ring 1 after the flexible graphite packing I2 is compressed.

All the fixing and the connection of the sealing combination device are completed by using bolts, and the three-split pressing plate 8 is used for providing convenience for installation, so that the consumption of the flexible graphite packing III 6 can be increased at any time after being worn, and the tight contact of the flexible graphite packing III and the trunnion rotating sleeve 9 is ensured. The sealing combination device is easy to maintain, disassemble and enhance the sealing effect, and a good installation method is naturally formed.

Claims

1. A sealing combination device for fixing a sealing element of a water-cooling airtight box of a blast furnace iron-making distributor is characterized by comprising a sealing ring (1), a flexible graphite packing I (2), a flexible graphite packing II (3), a stuffing box (4), a metal-coated gasket (5), a flexible graphite packing III (6), a water-cooling chassis (7), a three-split pressing plate (8), a trunnion rotating sleeve (9), a three-split washer (10), a bolt I (11), a bolt II (12) and a bolt III (13); the water-cooling chassis (7) is a fixed component with a rotary inner surface being a cylindrical surface, the center of the cylinder is also the center line of the distributor, the water-cooling chassis is arranged in the furnace top gas area, and the lower surface of the water-cooling chassis is directly contacted with high-temperature and high-pressure furnace gas; the trunnion rotating sleeve (9) is a rotary motion component around the central line of the distributing device, the trunnion rotating sleeve (9) is an external cylinder and is arranged in a normal-pressure normal-temperature furnace gas sealing area, and an internal cylinder is directly contacted with high-temperature high-pressure furnace gas; the fitting surface of the inner cylindrical surface of the fixing piece water-cooling chassis (7) and the outer cylindrical surface of the rotary piece trunnion rotating sleeve (9) is provided with an interval to ensure the rotary motion of the rotary piece, and the high-temperature and high-pressure furnace gas has the tendency of flowing to a normal-temperature and normal-pressure region along the gap; the sealing ring (1) is screwed and fixed in one groove of the stuffing box (4) through a first bolt (11), meanwhile, a flexible graphite packing I (2) is tightly pressed on a corner in the groove of the stuffing box (4), a flexible graphite packing II (3) is arranged in the other groove of the stuffing box (4), and a metal-coated gasket (5) is arranged in a shallow groove of the stuffing box (4); the sealing ring (1), the flexible graphite packing I (2), the flexible graphite packing II (3), the packing box (4) and the metal-coated gasket (5) form an assembly part, and the assembly part is fixedly connected to the lower surface of the water-cooling chassis (7) through a bolt II (12); two sets of flexible graphite packing three (6) are filled in water-cooling chassis (7) towards the annular of the outer face of cylinder of trunnion rotating sleeve (9), place one third packing ring (10) in the middle of two sets of flexible graphite packing three (6), when three subdivision clamp plates (8) are connected through three (13) of bolt and are fixed on water-cooling chassis (7), compress flexible graphite packing three (6), let flexible graphite packing three (6) hug closely on the outer face of cylinder of trunnion rotating sleeve (9).