CN102618677B - Method for cleaning materials in large-scale blast furnace in overhaul - Google Patents

Abstract

The invention discloses a method for cleaning materials in a large-scale blast furnace overhaul furnace, which belongs to ironmaking blast furnaces, and in particular relates to a blast furnace repair method. The method is carried out according to the following steps: cooling the furnace, installing equipment for hoisting broken slag and slag discharge, lifting an excavator into the furnace, mechanically cleaning materials in the furnace, and lifting out the excavator. The method of the present invention has been implemented in the overhaul of five large blast furnaces. The advantages are: novel concept, simple construction equipment, greatly reduced slag removal personnel, and reduced labor intensity; fast slag removal speed, reduced slag removal time, shortened furnace repair period, improved The efficiency of furnace repair was improved, and the blast furnace was put into production ahead of schedule.

Description

Material cleaning method in large-scale blast furnace overhaul

technical field

The invention belongs to ironmaking blast furnaces, in particular to a blast furnace repair method.

technical background

Blast furnace overhaul griddle is the first process to remove iron scale and iron slag inside the furnace. The current method used in the griddle is: after the blast furnace is cooled, scaffolding is set up in the furnace; the slag is manually removed and crushed with a pick, sledgehammer and steel braze; the slag is manually removed, dug by hand, lifted on the shoulder, and poured out of the furnace. Its disadvantages are: due to the abnormally strong iron scale in the furnace and a large amount of iron slag, the working environment is harsh, the labor intensity is high, there are more than 40 operators, and the construction cost is high; It took more than 40 days, and the furnace repair period was long, which delayed the blast furnace commissioning time and seriously affected the blast furnace ironmaking production.

Contents of the invention

In order to overcome the defects existing in the prior art, the object of the present invention is to provide a method for cleaning materials in a large-scale blast furnace overhaul. Construction equipment is installed in the furnace, and mechanical slag removal is used to quickly clean materials in the furnace, repair the furnace as soon as possible, and reduce the number of griddles time and personnel, shorten the furnace repair period, reduce the cost of furnace repair, and put the blast furnace into production as soon as possible.

The material cleaning method in the large-scale blast furnace overhaul furnace is carried out according to the following steps:

1. Cold furnace

1) After stopping the supply of materials to the furnace, start to cool the furnace. Sprinkle water from the tuyere and cross temperature measuring point to cool down. The cooling time is 60-80 hours, and the temperature in the furnace drops below 30°C;

2), Ventilation Set up 2-3 fans to ventilate, cool down, and improve the working environment;

3) Clean the repair hole of the chute and open the passage for lifting the excavator. The height of the hole is 2-2.5m and the width is 1.5-2m. Observe the "hanging tumor" on the inner wall of the furnace roof to prevent falling and hurting people during construction.

2. Set up equipment for hoisting broken slag and slag discharge

1) Use the furnace front crane and furnace top crane, and set up chain hoists to cooperate with the furnace top crane;

2) Set up a traction mechanism. A slow drum hoist is installed next to the inspection hole of the chute on the furnace top platform. The traction rope bypasses the furnace body through the fixed pulley set outside the blast furnace, and passes through the ignition hole opposite the inspection hole of the chute back to the blast furnace. Next to the manhole of the chute;

3) Install the belt conveyor for slag discharge. After the small and middle sleeves of the tuyere of the blast furnace are removed, a belt conveyor is installed at the symmetrical tuyere of the blast furnace, extending from the inside of the furnace to the outside of the furnace.

3. Lift the excavator into the furnace

1) Hoisting in front of the furnace Remove the cover of the cab of the excavator, hoist it from the driving in front of the furnace to the casting yard, the excavator will go to the tuyere platform by itself, and stop under the hoisting hole of the furnace top;

2) The excavator is equipped with a breaker, the body of the excavator and the chain belt are aligned longitudinally, the arm beam is straight, and it is sealed by a chain hoist to prevent the center of gravity from changing due to the hydraulic system not being locked tightly when the body is rotating. happened;

3) Determine the excavator's hanging method and hanging point Three steel wire ropes are hung on the driving hook on the furnace top, two long steel wire ropes are connected to the hoisting points at the front and back of the excavator, and a short steel wire rope is hoisted by the arm lever and chain hoist Hang the boom beam of the excavator, start the driving on the furnace roof, and adjust the balance state of the excavator with the chain hoist;

4) Hoisting the excavator on the top of the furnace

The three hanging points of the excavator are hung on the furnace top crane. After adjusting the balance, start the furnace roof crane and hoist the excavator above the inspection hole of the chute; adjust the chain block to make the excavator tilt forward at a set angle, and the Check the inspection hole of the chute; the hoist pulls the wire rope to pull the hanging point in front of the fuselage, start the hoist to pull into the furnace, the driving hook head falls slowly, and the hoist slowly pulls until the excavator is placed at the bottom of the furnace.

4. Slag cleaning in the furnace

1) Remove the driving coupler, wire rope, chain hoist and traction wire rope, assemble the cab cover, inspect and adjust the excavator; after the start of work, arrange 3-4 excavator drivers to work in consecutive shifts according to the volume of the blast furnace , to ensure the continuity and efficiency of construction;

2) Slag Breaking Start the excavator, and the hammer breaks the iron scale and slag iron around the furnace wall and the bottom. cavity bottom;

3) The excavator is replaced with a bucket, and the broken iron scale and iron slag are shoveled onto the belt conveyor with the bucket, and then driven out of the furnace by the belt conveyor, and then transported out of the construction site.

5. Lift out the excavator After the griddle is finished and the furnace is cleaned, the excavator is lifted from the furnace to the outside of the furnace.

The method of the invention has been implemented in the overhaul of five blast furnaces of our company.

Compared with the existing technology, the advantages are: novel concept, simple construction equipment, greatly reduced slag removal personnel, and reduced labor intensity; fast slag removal speed, reduced slag removal time, shortened furnace repair period, improved furnace repair efficiency, and blast furnace input in advance Production.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings.

Figure 1 is a schematic diagram of the configuration of construction equipment for the method of cleaning materials in the large-scale blast furnace overhaul (before the excavator enters the furnace).

Figure 2 is a schematic diagram of the construction equipment configuration of the material cleaning method in the large-scale blast furnace overhaul (after the excavator enters the furnace).

Figure 3 is a schematic diagram of the configuration of construction equipment for the method of cleaning materials in the large-scale blast furnace overhaul (the excavator works after entering the bottom of the furnace).

In the figure 1. Blast furnace 2. Ignition hole 3. Fixed pulley 4. Rotary chute 5. Chute inspection hole 6. Chain hoist 7. Furnace top driving 8. Excavator 9. Hoist 10. Traction wire rope 11. Tuyere platform 12. Furnace Top platform 13. Temporary belt conveyor 14. Tiekou platform, 15. Furnace bottom. the

Detailed ways

Example 1

The company's 2500m3 blast furnace is overhauled and slag-removed. The construction equipment used includes: 1 hoist, 2 chain hoists 3t, Φ19mm in the wire rope, shackle 3t, fixed pulley 2t, 1 excavator, 1-2 belt conveyors .

The material cleaning method in the blast furnace overhaul furnace is carried out according to the following steps:

1) Cooling furnace After the blast furnace stops charging, start cooling the furnace, sprinkle water into the furnace from the tuyere and cross temperature measuring point, the cooling time is 72 hours, and the temperature in the furnace drops below 30°C;

2) Ventilation Set up 2 fans for ventilation and cooling;

3) Clean (uncover) the manhole 5 of the chute, 2×1.8㎡, and open up the passage for lifting the excavator.

2. Set up excavators for hoisting and breaking slag and belt conveyors for slag discharge

1) Use the furnace front crane (not marked in the figure), the furnace top crane 7, and the chain hoist 6 to cooperate with the furnace top crane;

2) Set the traction mechanism. Set the reel winch 9 beside the chute inspection hole 5. The traction wire rope is guided by 3 sets of four sets of fixed pulleys outside the furnace, bypasses the furnace body, and passes through the ignition hole 2 on the opposite side of the chute to the chute for maintenance. next to the hole;

3) Install the slag discharge belt conveyor 13, the belt conveyor is 10m long and 0.4m wide, placed in the symmetrical tuyere of the furnace body, and protrudes from the furnace to the outside of the furnace.

3. Lift the excavator 8 and send it into the furnace

1) For hoisting by driving in front of the furnace, remove the cab cover of the excavator, hoist it from the driving in front of the furnace (not marked in the figure) to the casting yard, go to the tuyere platform 11 by yourself, and stop under the hoisting hole of the driving on the furnace top;

2) The excavator is equipped with a breaker, the body and the chain belt are vertically aligned, the arm beam is straight, and it is sealed by a chain hoist;

3) Determine the hanging method and hanging point of the excavator. The driving hook head on the furnace top is lowered, and three steel wire ropes are installed on the hook head. The boom, chain hoist and shackle are clamped on the boom beam, and the chain hoist is used to adjust the balance state of the excavator;

4) Hoisting the excavator on the top of the furnace

The three hanging points of the excavator are hoisted on the top of the furnace, and lifted to the bottom of the chute inspection hole; adjust the chain block so that the excavator is tilted forward at a certain angle, and the body is facing the chute inspection hole; the hoist pulls the wire rope to pull the body At the front hanging point, start the hoist to pull into the furnace, the driving coupler head falls slowly, and the hoist slowly pulls it until it is placed at the bottom of the furnace.

4. Slag cleaning in the furnace

1) Remove the driving coupler, wire rope, hand chain hoist, traction wire rope and the shackle on the hanging point, assemble the cab cover, inspect and adjust the excavator;

2) Breaking slag Start the excavator, and the breaking hammer will break the iron scale and slag iron around the furnace wall and the bottom, and it will be in block shape. Clean in layers from top to bottom, until the lower edge of the tuyere, the iron mouth and the bottom of the furnace cavity;

3) The excavator is replaced with a bucket, and the broken iron scale and iron slag are shoveled onto the belt conveyor with the bucket, and then driven out of the furnace by the belt conveyor, and then transported out of the construction site.

5. Lift out the excavator. After the griddle is finished and the furnace is cleaned, the excavator is lifted from the furnace to the outside of the furnace for the next process of repairing the furnace.

According to this method, the time for cleaning slag from the griddle was shortened from more than 20 days to 2 days, saving more than 40 construction workers, reducing repair costs, and the blast furnace was produced 15 days in advance.

Claims (1)

1. The material cleaning method in the large-scale blast furnace overhaul furnace is characterized in that it is carried out according to the following steps: 1). Cold furnace a After stopping the supply of materials to the furnace, start to cool the furnace. Sprinkle water from the tuyere and the cross temperature measuring point to cool down. The cooling time is 60-80 hours, and the temperature in the furnace drops below 30°C; b Ventilation Set up 2-3 fans to ventilate, cool down and improve the working environment; c Clean the inspection hole (5) of the chute, open the passage for lifting the excavator, the hole height is 2-2.5m and the width is 1.5-2m, and observe the "hanging tumor" on the inner wall of the furnace roof to prevent falling and hurting people during construction; 2). Set up equipment for hoisting broken slag and slag discharge a Make use of the furnace front crane and furnace top crane (7), and set up a hand chain hoist (6) to cooperate with the furnace top crane; b Set up a traction mechanism, a slow drum hoist (9) is provided next to the chute inspection hole of the furnace top platform (12), and the traction wire rope (10) bypasses the furnace body through the fixed pulley block (3) arranged outside the blast furnace, and is repaired by the chute The ignition hole (2) on the opposite side of the hole passes through the blast furnace (1) and returns to the side of the chute inspection hole; c Set up a belt conveyor for slag removal (13). After the small and middle sleeves of the tuyere of the blast furnace are removed, a belt conveyor is installed at the symmetrical tuyere of the blast furnace, extending from the inside of the furnace to the outside of the furnace; 3). Lift the excavator (8) into the furnace a. Hoisting in front of the furnace Remove the cover of the cab of the excavator, and hoist it from the front of the furnace to the casting yard. The excavator will go to the tuyere platform (11) by itself and stop under the hoisting hole of the furnace top; b The excavator is equipped with a breaker, the body of the excavator and the chain belt are aligned vertically, the arm beam is straight, and it is sealed by a chain hoist to prevent the accident of changing the center of gravity due to the hydraulic system not being locked tightly when the body is rotating. ; c Determine the hanging method and hanging point of the excavator Three steel wire ropes are hung on the driving hook on the furnace top, two long steel wire ropes are connected to the hoisting points at the front and back of the excavator, and a short steel wire rope is hung by the arm and chain hoist for excavation Arm beam, start the furnace top driving, and adjust the balance state of the excavator with a chain hoist; d Furnace top driving hoisting excavator The three hanging points of the excavator are hung on the furnace top crane. After adjusting the balance, start the furnace roof crane and hoist the excavator above the inspection hole of the chute; adjust the chain block to make the excavator tilt forward at a set angle, and the Check the inspection hole for the chute; the hoist draws the steel wire rope to pull the hanging point in front of the fuselage, starts the hoist to pull into the furnace, the driving hook head falls slowly, and the hoist slowly pulls until the excavator is placed at the bottom of the furnace (15); 4). Slag cleaning in the furnace a Remove the driving coupler, wire rope, chain hoist and traction wire rope, assemble the cab cover, inspect and adjust the excavator; after the start of work, according to the size of the blast furnace, arrange 3-4 excavator drivers to work in consecutive shifts to ensure Continuity and efficiency of construction; b Breaking slag Start the excavator, and the hammer breaks the iron scale and slag iron around the furnace wall and the bottom. The slag material is 3-5m high, and it is layered from top to bottom until the lower edge of the tuyere, the iron port and the bottom of the furnace cavity ; c Slag discharge The excavator is replaced with a bucket, and the broken iron scale and iron slag are shoveled onto the belt conveyor with the bucket, and the belt conveyor is started to dump it out of the furnace and then out of the construction site; 5). Lift out the excavator. After the griddle is finished and the furnace is cleaned, the excavator is lifted from the furnace to the outside of the furnace.

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