CN107699650A - A method for installing a cooling wall of a blast furnace - Google Patents

Abstract

The invention discloses a method for installing a blast furnace cooling wall, which comprises the following steps of dismantling an old cooling wall and installing a new cooling wall, wherein the dismantling of the old cooling wall comprises the following steps: a large square hole is formed in the top of the furnace, and a distribution chute is modified; removing the external connecting pipe of the old cooling wall; arranging a winch; the old cooling wall water pipe is threaded with a steel wire rope; installing and welding a door-shaped seat for ejecting an old cooling wall; the jack ejects out the cooling wall; the central slider hook head is hung; the central slider is matched with the winch to lift the old cooling wall out of the large square hole; cleaning; the new cooling wall installation comprises the following steps: setting a lifting point on the hot surface of the new cooling wall and spraying the hot surface; threading a steel wire rope through the water pipe of the new cooling wall; connecting the rope head of a steel wire rope led out from a water pipe of the new cooling wall with the rope head of the hoisting machine, and installing and falling by utilizing two hoists and a central slider in a matching way; adjusting the technical parameters of the installation of the new cooling wall; and (5) fixing the cooling wall to finish the installation. The invention shortens the overhaul period, reduces the cost and provides favorable conditions for the recovery production of the blast furnace.

Description

A method for installing a cooling wall of a blast furnace

technical field

The invention relates to a method for installing a cooling wall of a blast furnace, in particular to an installation method for replacing a small number of cooling walls during annual maintenance or intermediate maintenance, and belongs to the technical field of blast furnaces.

Background technique

The blast furnace stave is the key equipment to avoid the furnace skin being impacted by the blast furnace heat load in the blast furnace production and smelting. Once installed, the furnace needs to be used for a generation, but due to high temperature erosion and the erosion and wear of the furnace material, individual staves are often damaged in advance, losing cooling effect and affecting the normal and safe production of the blast furnace.

Faced with this situation, the usual method is to take advantage of the opportunity of the blast furnace’s intermediate maintenance to shut down the blast furnace with an empty material line, and the maintenance personnel enter the furnace, set up a movable hanging pan, partially replace the stave, and then dig out the hearth to restore the blast furnace Production.

This technology can realize partial replacement of staves, but the maintenance cycle is long, the cost is high, and the recovery of the blast furnace is slow after it is put into production.

Contents of the invention

The invention overcomes the defects of the prior art and provides a method for installing the stave of a blast furnace, which can realize partial replacement of the stave by taking advantage of the annual repair opportunity of the blast furnace (generally within 5-6 days).

The present invention is achieved like this:

A method for installing a blast furnace stave, including removing the old stave and installing a new stave,

The removal of the old stave includes the following steps:

(1) Open a large square hole on the top of the furnace, remove the valve box and the central throat, refit the distribution chute, install a reversing pulley on the upper part of the distribution chute, install a fixed pulley on the lower part of the distribution chute, use the material tank as the main lifting point, install main blocks;

(2) Remove the external connecting pipe of the old stave, and connect the water pipes of the upper and lower staves connected to the old stave with metal hoses to ensure the smooth water flow of the upper and lower staves and protect the staves that will not be replaced; Cut the old stave sealing cover to expose the copper pipe of the stave and cut it to a suitable length, so as to facilitate the output of the jack;

(3) The setting of the hoist, set the 1# and 2# hoist on the platform where the upper and lower nozzles of the old cooling wall are located, the hoist of the center slider of the furnace top is set on the large square hole platform on the furnace top, and the rope ends of the 1# and 2# hoist Lead to the horizontal and parallel positions with the upper and lower nozzles of the old cooling wall respectively;

(4) The old stave water pipes are threaded with steel wire ropes; use iron wires as traction lines to pass the steel wire ropes through the two cooling water pipes in the middle of the stave, and use tapered fixing fixtures to fix the steel wire ropes with the nozzles of the cooling water pipes to prevent the steel wire ropes from sliding; then put 1 The rope ends of #winch and 2# winch are respectively connected with the wire ropes at the upper and lower ends, and are slightly stressed;

(5) Install and weld the door-shaped seat for ejecting the old cooling wall, and the installation position is outside the two cooling water pipe holes at the opposite corners of the old cooling wall;

(6) Remove the old stave bolts, respectively install two jacks on the door-shaped seat, loosen the stave, and at the same time, the 1# and 2# winches cooperate to gradually push out the stave to push out the stave;

(7) Hanging of the hook head of the center slider; drop the center slider to the replacement height, use the cloth chute to rotate the hook head to the direction of replacing the cooling wall, and hook the center slider into the rope buckle of the cooling wall with an iron hook , jog the center slider to force the hook head;

(8) The center slider cooperates with the 1# and 2# winches to lift the old cooling wall out of the large square hole, and at this time the rope heads of the 1# and 2# winches are synchronously lifted to the big square hole platform;

(9) Clean up the grouting material around the old stave and the inner side of the furnace shell, extend it from the water pipe hole of the stave in the furnace shell, clean the grouting material with a shovel and chisel, and prepare for the installation of a new stave;

New stave installation includes the following steps:

(1) Before installing the new cooling wall, set the lifting point on the hot surface of the new cooling wall and spray the hot surface, and install the sealing plate replacing the packing in place;

(2) The new stave water pipes are threaded with steel wire ropes; use iron wires as traction lines to pass the steel wire ropes through the two water pipes in the middle of the new stave, and use tapered fixing fixtures to fix the steel wire ropes to the nozzles of the stave water pipes to prevent the wire ropes from sliding;

(3) Connect the rope head of the steel wire rope leading out of the water pipe of the new stave to the rope head of the hoist 1# and 2# in advance, hoist the new stave to the large square hole with the furnace roof crane and switch it to the center slider, and the hook head of the center slider Hang on the hot surface lugs modified by the new stave;

(4) Use two winches to cooperate with the center slider to slowly lower the new cooling wall to the installation place, and use 1# and 2# hoisting machines to place the new cooling wall under force;

(5) Adjust the technical parameters of the new stave installation, including adjusting the gap between the new stave and the adjacent stave and the gap between the cooling water pipe and the furnace shell of the new stave;

(6) The cooling stave is fixed. After adjusting the gap, tighten the bolts, and grout the holes from the outside of the furnace skin to complete the installation of the cooling stave, so that no one enters the furnace for operation.

A further solution is:

One end of the tapered fixing fixture is inserted into the cooling water pipe and fixed. There is a small hole through the steel wire rope in the middle of the tapered fixing fixture. After the steel wire rope passes through the small hole, the tapered fixing fixture is inserted into one end of the cooling water pipe Compress and secure the wire rope.

A further solution is:

The door-shaped seat adopts I-beam I16.

A further solution is:

The two jacks installed on the door-shaped seat are 50t jacks.

A further solution is:

The furnace top crane is a 65T crane.

A further solution is:

Adjust the gap between the stave and the adjacent stave to be 20mm±5mm, and the gap between the cooling water pipe and the furnace shell to be greater than 8mm.

A further solution is:

The pre-tightening force of the fastening bolts is 400N·m.

For safe operation, before replacing the stave, it is necessary to lower the material line to 0.5 meters from the lower edge of the stave to be replaced, press water slag to control the temperature in the furnace, and install an ignition gun to ignite the gas on the material surface to control the gas content.

This application refits the distributing chute to ensure that the center slider suspension rope is closer to the cooling wall that needs to be replaced. Refit the stave hanging point from the original upper side to the hot side of the stave without affecting the refractory spraying on the hot side. Special tapered jig for processing locking wire rope. Make the stave joint measuring cover plate to replace the original artificial filler to ensure that the grouting material does not leak.

The invention can realize partial replacement of damaged staves on the premise that the blast furnace is not stopped due to empty material line. The maintenance period is shortened, the cost is reduced, and favorable conditions are provided for the resumption of production of the blast furnace.

Description of drawings

Figure 1 Schematic diagram of hoisting in the furnace;

Fig. 2 The wire rope fixing diagram for hoisting the old stave;

Figure 3 is a schematic diagram of the removal of the old stave;

Figure 4 is a schematic diagram of the installation of the new stave.

Wherein, in Fig. 2, A is a partially enlarged schematic diagram of the door-shaped seat; B is a partially enlarged schematic diagram of the tapered fixing fixture.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

A method for installing a blast furnace stave, comprising:

1. Remove the old cooling wall

(1) As shown in attached drawing 1, a large square hole 6 is opened on the top of the furnace, the valve box and the central throat are removed, and the gear box 2 is left undismantled. After the distribution chute 3 is refitted, a redirection pulley is installed on the upper part of the distribution chute 3 4. Install the fixed pulley 5 at the bottom of the distribution chute, use the material tank 1 as the main lifting point, and install the main block block 16.

(2) Remove the outer connecting pipe of the old stave, and connect the upper and lower stave water pipes connected with the stave with metal hoses to ensure the smooth water flow of the lower stave and protect the stave that will not be replaced. Cut the old stave sealing cover, and cut the exposed stave copper pipe to a suitable length, so as to facilitate the output of the jack.

In this embodiment, the replacement of the old stave above the sixth section of stave is taken as an example for specific description.

(3) The setting of the hoist, set 1# hoist 7 and 2# hoist 8 on the platform where the upper and lower nozzles of the old cooling wall are located, the hoist of the furnace top center slider 9 is set on the large square hole platform on the furnace top, 1# hoist 7 and The rope heads of 2# winch 8 are respectively led to the horizontal and parallel positions with the upper and lower nozzles of the old cooling wall.

(4) The old stave water pipes are threaded with steel wire ropes. Use iron wire as a traction line to pass the steel wire rope 12 through the two cooling water pipes 13 in the middle of the old cooling wall, and fix the steel wire rope 12 and the nozzle of the cooling water pipe 13 with a specially processed tapered fixing fixture 11 to prevent the steel wire rope from sliding (as shown in Figure 2 Enlarged view at B). Then the rope heads of 1# hoist 7 and 2# hoist 8 are connected to the wire ropes at the upper and lower ends respectively, and are slightly stressed.

(5) Install the door-shaped seat 14 of the old cooling wall welded on the top. The door-shaped seat is made of I-beam I16, and the installation position is outside the two cooling water pipe holes at the diagonal. The details are shown in the enlarged view at A in the accompanying drawing 2.

(6) Remove the bolts of the old cooling wall, install two 50t jacks 15 on the door-shaped seat 14, loosen the old cooling wall, and at the same time, 1# and 2# winches cooperate to gradually push out the cooling wall, and wait for the old cooling wall to top out of the position shown in Figure 3.

(7) Hanging of the hook head of the center slider. As shown in Figure 3, drop the center slider 9 to the replacement height, use the distribution chute 3 to rotate the hook head to the direction of replacing the cooling wall, hook it into the rope buckle of the cooling wall with an iron hook, and move the center slider , to force the hook head.

(8) The center slider cooperates with the 1# and 2# winches to lift the old cooling wall out of the large square hole, and at this time the rope heads of the 1# and 2# winches are synchronously lifted to the big square hole platform.

(9) Clean up the grouting material around the dismantled cooling wall and the inner side of the furnace shell, extend it from the water pipe hole of the cooling wall of the furnace shell, and clean the grouting material with a shovel or chisel to prepare for the installation of a new cooling wall.

2. Install a new cooling wall

(1) Before installing the stave, set the lifting point on the hot surface of the new stave and spray the hot surface, and install the sealing plate replacing the packing in place.

(2) The water pipes of the new stave are threaded with steel wire ropes. Use the iron wire as the traction line to pass the steel wire rope through the two water pipes in the middle of the new cooling wall, and use the specially processed tapered fixing fixture to fix the steel wire rope with the nozzle of the new cooling wall water pipe to prevent the steel wire rope from sliding.

(3) Connect the rope head of the steel wire rope leading out of the stave water pipe to the rope head of 1# and 2# hoist in advance, and use the 65T crane on the furnace top to hoist the new stave to the large square hole and switch it to the center slider, which has 9 hooks The head is hung on the hot surface lug 17 refitted by the new cooling wall, as shown in Figure 4.

(4) Use two winches to cooperate with the center slider to slowly lower the new stave to the installation place, and use 1# and 2# hoists to place the stave under force.

(5) Adjust the technical parameters of the stave, the gap between the stave and the adjacent stave (20mm±5), the gap between the cooling water pipe and the furnace shell (greater than 8mm).

(6) The stave is fixed. After adjusting the gap, tighten the bolts with a pre-tightening force of 400N·m. Grouting is done from the outside of the furnace skin to complete the installation of the stave, so that no one enters the furnace for operation.

Although the present invention has been described here with reference to the illustrative examples of the present invention, the above-mentioned examples are only preferred implementations of the present invention, and the implementation of the present invention is not limited by the above-mentioned examples. It should be understood that those skilled in the art Many other modifications and embodiments can be devised which will fall within the scope and spirit of the principles disclosed in this application.

Claims (7)

1. a kind of installation method of blast furnace cooling stave, including old cooling wall is removed and the installation of new cooling wall, it is characterised in that：

Old cooling wall, which is removed, to be comprised the following steps：

（1）, furnace roof open big square hole, remove valve box and central throat tube, distributor chute reequiped, pacify on distributor chute top Dress changed course pulley, installs fixed pulley in distributor chute bottom, by the use of batch can as main suspension centre, installs main tackle pulley；

（2）, connecting leg outside old cooling wall removed, the water pipe metal for upper and lower section of cooling wall being connected with the old cooling wall is soft Pipe connects, it is ensured that upper and lower section of cooling wall current are unimpeded, protect the cooling wall being changed without；Old cooling wall seal closure is cut, is exposed cold But wall copper pipe and appropriate length is cut to, to facilitate very heavy ejecting force as principle；

（3）, hoist engine setting, 1#, 2# hoist engine are set in platform residing for lower nozzle on old cooling wall, furnace roof center slider Hoist engine is arranged at the big square hole platform of furnace roof, and the fag end of 1# and 2# hoist engines is respectively led into puts down with lower nozzle level on old cooling wall Line position is put；

（4）, old cooling wall water pipe reeves；Make draught line by two cooling waters among steel wire penetrating cooling wall with iron wire Pipe, and fixed steel wire rope and the cooling water pipe mouth of pipe with taper holding clamp, prevent steel cable sliding；Then by 1# hoist engines and The fag end of 2# hoist engines is connected with the steel wire rope of upper and lower ends respectively, and somewhat stress；

（5）, erecting and welding be used to eject the gate stand of old cooling wall, installation site is diagonal two cooling water pipes of old cooling wall Outside hole；

（6）, the old cooling wall bolt of dismounting, two jack are installed respectively on gate stand, push up loose cooling wall, while 1#, 2# Hoist engine coordinates gradually ejection cooling wall, and cooling wall is ejected；

（7）, center slider gib head hangs；Fall center slider to height is changed, rotated using distributor chute and go to eave tile more Cooling wall direction is changed, center slider is hooked into the sling of cooling wall with cleek, crawl center slider, makes gib head stress；

（8）, center slider and 1#, 2# hoist engine coordinate, old cooling wall is hung out from big square hole, now 1#, 2# hoist engine fag end Synchronously rise to big square hole platform；

（9）, cleaning remove old cooling wall around and its furnace shell on the inside of grouting material, stretched at cooling wall of furnace shell water pipe hole, use Scoop, chisel clean out grouting material, are ready to install new cooling wall；

New cooling wall installation comprises the following steps：

（1）, before the new cooling wall of installation, suspension centre is set in new cooling wall hot face and hot face is sprayed, while filler will be substituted Sealing plate be installed in place；

（2）, new cooling wall water pipe reeves；Make draught line by two water pipes among the new cooling wall of steel wire penetrating with iron wire, And fixed steel wire rope and the cooling wall water pipe mouth of pipe with taper holding clamp, prevent steel cable sliding；

（3）, new cooling wall water pipe is drawn into cable wire end be connected in advance with 1#, 2# hoist engine fag end, will be newly with furnace roof crane Cooling wall is hung to big square hole and switched to the slider of center, and center slider gib head is hung on the hot face hanger of new cooling wall repacking；

（4）, coordinated using two hoist engines and center slider new cooling wall slowly drop to installation place, utilize 1#, 2# elevator Machine pulls new cooling wall installation dropping place；

（5）, the new cooling wall of adjustment every technical parameter, including the new cooling wall of adjustment and adjacent cooling wall gap and new cooling are installed The cooling water pipe of wall and furnace shell gap；

（6）, cooling wall fixes；

After adjusting gap, fastening bolt, it is in the milk from stove skin external apertures, completes the installation of cooling wall, realizing whole process, nobody enters Enter in stove and operate.

2. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

One end of the taper holding clamp is filled in cooling water pipe and fixed, and has one to run through steel wire among taper holding clamp The aperture of rope, after steel wire penetrating aperture, steel wire rope is compressed and consolidated by filling in one end of cooling water pipe by taper holding clamp It is fixed.

3. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

The gate stand uses I-steel I16.

4. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

Two jack installed on the gate stand are 50t jack.

5. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

The furnace roof crane is 65T cranes.

6. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

Adjustment cooling wall is 20mm ± 5mm with adjacent cooling wall gap, and cooling water pipe is more than 8mm with furnace shell gap.

7. the installation method of blast furnace cooling stave according to claim 1, it is characterised in that：

The pretightning force of the fastening bolt is 400Nm.