Construction method for removing refractory material in blast furnace and hot blast furnace during internal maintenance

Abstract

The application discloses a construction method for removing refractory material in a blast furnace or hot blast furnace, comprising the following steps: S1, removing and cleaning furnace facilities; S2, making a hanging disc; S4, driving a excavator to the hanging disc; S5, connecting a lower lifting lug of a supporting leg with a lifting hook of a lifting device through a sling, installing a drop chain between the lower lifting lug and an upper lifting lug of a first layer after lifting the hanging disc to the first layer removal height; S6, removing the refractory material by the excavator, and removing the refractory material from a discharge port to a furnace bottom and then to a furnace mouth; and S7, repeating steps S5 and S6 to remove refractory material of a next layer. The application has the advantages of simple operation, stability and reliability, fast construction speed, low construction cost, effective saving of labor cost, complete and clean removal of the refractory material, safety and stability meeting the construction requirements, and greatly shortened construction period.

Description

TECHNICAL FIELD

[0001] The present application relates to a construction method for removing refractory materials in a blast furnace and hot blast furnace. BACKGROUND

[0002] The removal and replacement of refractory materials in the furnace often involves the removal and replacement of refractory materials in the furnace during the maintenance construction of the blast furnace and hot blast furnace. The traditional removal method uses manual and crane cooperation, and the removal workers use safety belts for high-altitude suspended operation, which is low in construction efficiency and safety, long in construction period, and high in labor cost. The Chinese invention patent application with the application publication number CN112111620A discloses a ball top refractory material removal equipment and removal method for a blast furnace and hot blast furnace. The invention application still needs workers to hang operations in the early stage of the removal operation, which is low in construction efficiency and safety. SUMMARY

[0003] The present application aims to solve the above technical problems and provides a construction method for removing refractory materials in a blast furnace and hot blast furnace, which is high in safety and efficiency.

[0004] The present application solves the technical problems by adopting the following technical solutions:

[0005] A construction method for removing refractory materials in a blast furnace and hot blast furnace, comprising the following steps:

[0006] S1, removing and cleaning the furnace facilities

[0007] S2, making a hanging plate

[0008] A hanging plate is made in the furnace shell, and the hanging plate comprises a plate body and a leg. The plate body is uniformly distributed with multiple radial legs on the outer peripheral surface, and a discharge port is formed at the edge of the plate body. Each leg is provided with a lower lifting lug;

[0009] S3, a hoisting device is arranged at the top of the furnace shell, and multiple upper lifting lugs corresponding to the lower lifting lugs of the legs are arranged on the inner wall of the furnace shell;

[0010] S4, the excavator drives onto the hanging plate;

[0011] S5, the lower lifting lug of the leg is connected to the hook of the hoisting device through a lifting cable. After the hanging plate is lifted to the first layer of removal height, a chain is arranged between the lower lifting lug and the upper lifting lug of the first layer;

[0012] S6, the excavator removes the refractory materials, and the removed refractory materials are discharged to the furnace bottom through the discharge port and transported out of the furnace opening;

[0013] S7, repeating steps S5 and S6 to remove the refractory materials of the upper layer.

[0014] The present application with the above technical solutions has the following beneficial effects compared with the prior art:

[0015] It is easy to operate, stable and reliable, fast to construct, and low in construction cost. It can effectively save labor costs, and the refractory materials can be completely and cleanly removed. The safety and stability can meet the construction requirements, and the construction cycle is greatly shortened.

[0016] Furthermore, the optimized solution of the present invention is:

[0017] The tray body is a regular polygon or a circle, and includes a frame and a base plate placed inside the frame, with the discharge port located at the edge of the base plate.

[0018] The lifting device is a winch.

[0019] A jack is installed at the outer end of the outrigger.

[0020] A guide sleeve is fixed to the inner wall of the furnace shell below the excavator. A vertical support rod is inserted through the guide sleeve. The support rod is a multi-section assembly structure, and the upper end of the support rod supports the outrigger. Attached Figure Description

[0021] Fig. 1 This is a schematic diagram of the lifting platform according to an embodiment of the present invention;

[0022] Fig. 2 This is a top view of the dismantled state in an embodiment of the present invention;

[0023] Fig. 3 This is a perspective view of the hanging plate according to an embodiment of the present invention.

[0024] In the diagram: 1. Lifting platform; 1-1. Platform body; 1-2. Frame; 1-3. Base plate; 1-4. Toe plate; 1-5. Discharge port; 2. Outrigger; 3. Excavator; 4. Winch; 4-1. Hook; 5. Wire rope; 6. Furnace shell; 7. Refractory material; 8. Lower lifting lug; 9. Upper lifting lug; 10. Chain hoist. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] See Figs. 1-3 This embodiment describes a construction method for removing refractory materials during maintenance of a blast furnace or hot blast stove, and is carried out according to the following steps:

[0027] S1. Dismantling and cleaning of furnace internal facilities;

[0028] S2, Hanging Plate Manufacturing

[0029] After the furnace is dismantled and cleaned, a hanging platform 1 is made inside the furnace shell 6 to transport the raw materials to the bottom of the furnace. The hanging platform 1 is hexagonal, octagonal, or circular. In this embodiment, it is hexagonal. The hanging platform 1 is mainly composed of a platform body 1-1 and support legs 2. The platform body 1-1 is mainly composed of a frame 1-2, a base plate 1-3, and a foot plate 1-4. The frame 1-2 is made of H-beam steel. The base plate 1-3 is welded inside the frame 1-2. The base plate 1-3 is a checkered plate with a discharge port 1-5 on its edge. The discharge port 1-5 is a notch with a size of 500 mm × 800 mm. The frame 1-2 is surrounded by the foot plate 1-4.

[0030] Six radial support legs 2 are welded to the outer circumference of the platform 1-1. The support legs 2 are H-beams and are located at the corners of the frame 1-2. Each support leg 2 is equipped with a lower lifting lug 8. The platform 1 can only be used if its load-bearing capacity is verified to be qualified. For each support leg 2, steel wire rope 5, lower lifting lug 8 and chain hoist 10 are selected according to the lifting verification data. The required verifications are as follows: steel wire rope verification, lifting lug verification, platform load-bearing capacity verification, and lifting equipment capacity verification.

[0031] S3. A winch 4 is installed on the platform at the top of the furnace shell 6. The hook 4-1 of the winch 4 is connected to the lower lifting lug 8 on the support leg 2 through the wire rope 5. The winch 4 lifts the lifting plate 1 horizontally. Using the lifting plate 1 as a platform, multiple layers of upper lifting lugs 9 are installed from top to bottom on the inner wall of the furnace shell 6. The upper lifting lugs 9 are installed on the water pipe holes of the cooling wall of the furnace shell 6. Each layer of upper lifting lugs 9 corresponds to the lower lifting lug 8. The lifting plate 1 is lowered to the bottom of the furnace.

[0032] S4. Excavator 3 drives onto the crane platform 1. Excavator 3 is an 80 model and is equipped with a hydraulic breaker.

[0033] S5. The lower lifting lug 8 of the outrigger 2 is connected to the hook 4-1 of the winch 4 via a steel wire rope 5. After the hoisting platform 1 is raised to the first demolition height, a chain hoist 10 is installed between the lower lifting lug 8 and the upper lifting lug 9 of the first layer. While the winch 4 suspends the excavator 3 and the hoisting platform 1, the chain hoist 10 and the upper lug 9 suspend the excavator 3 and the hoisting platform 1, providing double insurance. The excavator 3 and the hoisting platform 1 are stable and secure, without any swaying, ensuring the safety of the demolition operation. During the ascent of the hoisting platform 1, any unused upper lifting lugs 9 on the inner wall of the furnace shell 6 should be removed to avoid repeated operations.

[0034] After S6, the hoisting platform 1 and the excavator 3 are lifted into place, the breaker hammer of the excavator 3 breaks the refractory material 7 on the inner wall of the furnace shell 6. The broken refractory material 7 is discharged from the discharge port 1-5 to the bottom of the furnace and then transported out from the furnace opening.

[0035] S7. Repeat steps S5 and S6 to remove the upper layer of refractory material 7.

[0036] To increase stability during construction, jacks are installed at the outer ends of outriggers 2. After the hoisting platform 1 and excavator 3 are in place, the jacks are tightened against the inner wall of the furnace shell 6. As the demolition area increases, the jacks are adjusted as needed to maintain a tight seal against the inner wall of the furnace shell 6, ensuring construction safety. After the first layer of refractory material 7 is removed, a guide sleeve is welded to the inner wall of the furnace shell 6 below the excavator 3. A vertical support rod is inserted into the guide sleeve. The support rod has a multi-section assembly structure, and a U-shaped bracket is installed at the upper end of the support rod to support the outriggers 2. The height of the support rod increases with the height of the hoisting platform 1, making the demolition operation safer.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A construction method for removing refractory materials during maintenance of blast furnaces and hot blast stoves, comprising the following steps: S1. Dismantling and cleaning of furnace internal facilities S2, Hanging Plate Fabrication A hanging platform is made inside the furnace shell. The hanging platform includes a platform body and support legs. Multiple radial support legs are evenly distributed on the outer circumference of the platform body. A discharge port is opened on the edge of the platform body. Each support leg is equipped with a lower lifting lug. S3. A lifting device is installed at the top of the furnace shell, and multiple layers of upper lifting lugs corresponding to the lower lifting lugs of the support legs are installed on the inner wall of the furnace shell. S4. The excavator drives onto the crane platform; S5. The lower lifting lug of the outrigger is connected to the hook of the lifting device via a sling. After the lifting platform is raised to the first floor removal height, a chain hoist is installed between the lower lifting lug and the upper lifting lug of the first floor. S6. The excavator removes the refractory material. The removed refractory material is discharged from the discharge port to the bottom of the furnace and then transported out from the furnace opening. S7. Repeat steps S5 and S6 to remove the upper layer of refractory material.

2. The construction method for dismantling refractory materials during maintenance of blast furnaces and hot blast stoves according to claim 1, characterized in that: The tray body is a regular polygon or a circle, and includes a frame and a base plate placed inside the frame, with the discharge port located at the edge of the base plate.

3. The construction method for removing refractory materials during maintenance of blast furnaces and hot blast stoves according to claim 1, characterized in that: The lifting device is a winch.

4. The construction method for dismantling refractory materials during maintenance of blast furnaces and hot blast stoves according to claim 1, characterized in that: A jack is installed at the outer end of the outrigger.

5. The construction method for dismantling refractory materials during maintenance of blast furnaces and hot blast stoves according to claim 1, characterized in that: A guide sleeve is fixed to the inner wall of the furnace shell below the excavator. A vertical support rod is inserted through the guide sleeve. The support rod is a multi-section assembly structure, and the upper end of the support rod supports the outrigger.

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