Method for installing a water-cooled wall of a smelt reduction furnace

Abstract

The present application relates to the technical field of reduction furnace installation, in particular to a melting reduction furnace water-cooled wall installation method, steps are as follows: straight cylinder section furnace shell installation, straight cylinder section cooling wall is installed from bottom to top in the straight cylinder section furnace shell, the top of the straight cylinder section cooling wall is lower than the upper edge of the straight cylinder section furnace shell; the assembly of the conical section furnace shell and the conical section cooling wall, the gas chamber top cover and the top cover cooling wall, the vaporization flue shell and the vaporization flue cooling wall is carried out on the ground; the assembled conical section is hoisted, the clearance section cooling wall is installed between the conical section cooling wall and the straight cylinder section cooling wall by using a balance lifting arm; the gas chamber furnace shell is hoisted, the gas chamber cooling wall is installed from bottom to top in the gas chamber furnace shell; the gas chamber top cover and the vaporization flue are installed; the method is convenient for alignment welding, can guarantee the installation quality of each section furnace shell and water-cooled wall; for the module with small assembly quality and convenient hoisting, the method of ground assembly and integral hoisting is adopted, the installation period is shortened and the installation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of reduction furnace installation technology, and in particular to a method for installing a water-cooled wall in a molten reduction furnace. Background Technology

[0002] Smelting reduction smelting is an iron bath smelting technology that directly uses pulverized ore and pulverized coal. Compared with the traditional blast furnace ironmaking process, it eliminates the sintering, pelletizing, and coking processes, resulting in a shorter process flow. The smelting reduction furnace, as the main smelting equipment, has advantages over traditional blast furnaces, such as smaller size, easier construction, and less workload. In existing technologies, the water-cooled pipe installation method for smelting reduction furnaces typically involves first installing the furnace shell, and then installing the water-cooled pipes from top to bottom. However, currently, due to different smelting processes selected by various plants, the external shape of smelting reduction furnaces varies; for example, the one with application number CN2020300949802... The molten reduction furnace, with application number CN202030812862.0, has a furnace body that is wider at the bottom and narrower at the top, with a conical transition section. Using existing installation methods, the non-straight-tube water-cooled wall sections (conical section, gas chamber top cover, and gasification flue section water-cooled wall) are inconvenient to install, making hoisting and alignment difficult. If the method of assembling the water-cooled tubes with the furnace shell first and then assembling the furnace shell in sections is adopted, the furnace shell is not easy to weld, the reserved space is small, and it is not convenient to weld and assemble. At the same time, it may also damage the tube body of the water-cooled tubes. Therefore, the installation of water-cooled tubes in irregular molten reduction furnaces (non-straight-tube furnaces) is very difficult, resulting in poor construction quality and low efficiency. Summary of the Invention

[0003] The present invention aims to solve the above problems, thereby providing a method for installing the water-cooled wall of a non-straight cylindrical molten reduction furnace that is wider at the bottom and narrower at the top, which can improve installation efficiency and ensure the installation quality of the furnace body and water-cooled wall.

[0004] The invention solves the aforementioned problem by employing the following technical solution:

[0005] A method for installing water-cooled walls in a molten reduction furnace involves dividing the furnace water-cooled walls into several sections: straight cylindrical cooling walls, gap cooling walls, conical cooling walls, gas chamber cooling walls, top cover cooling walls, and vaporization flue cooling walls. Assembly of the conical furnace shell with the conical cooling walls, the gas chamber top cover with the top cover cooling walls, and the vaporization flue shell with the vaporization flue cooling walls is performed on the ground. The installation steps are as follows:

[0006] S1, Straight section installation: Erect a scaffolding platform and use a crane to lift and install the straight section furnace shell. Install the straight section cooling wall from bottom to top inside the straight section furnace shell. The distance between the upper edge of the uppermost straight section cooling wall and the upper edge of the straight section furnace shell is equal to the height of the gap section cooling wall.

[0007] S2, Conical Section Installation: The assembled conical section furnace shell and conical section cooling wall are hoisted and installed. The conical section furnace shell and the straight section furnace shell are welded and fixed. The gap between the conical section cooling wall and the straight section cooling wall is the reserved installation position for the gap section cooling wall.

[0008] S3, Installation of intermittent cooling wall: Install the intermittent cooling wall on the balance boom outside the furnace, level the balance boom, and use a crane to lift the balance boom into the furnace, then push the intermittent cooling wall into the reserved installation position of the intermittent cooling wall;

[0009] The balance boom includes a spreader, one end of which is equipped with a counterweight, and the other end is provided with an arc-shaped plate. The inner side of the gap section cooling wall abuts against the arc-shaped plate, and pipe clamps are provided at both ends of the arc-shaped plate to clamp the gap section cooling wall.

[0010] S4, Gas chamber installation: The gas chamber furnace shell is hoisted and welded to the conical section of the furnace shell; the scaffolding platform extends upward, and a crane is used to hoist the gas chamber cooling wall into the furnace, which is then installed inside the gas chamber furnace shell from bottom to top.

[0011] S5, Gas chamber top cover and gasification flue installation: Hoist the assembled gas chamber top cover and top cover cooling wall and install them on the gas chamber furnace shell; hoist the assembled gasification flue shell and gasification flue cooling wall and install the gasification flue shell on the gas chamber furnace shell.

[0012] Preferably, in step S3, the spreader arm of the balance boom is provided with three lifting lugs at intervals, a steel wire rope is connected to the bottom of the crane hook, and the other end of the steel wire rope is connected to the lifting lug located in the middle; two chain hoists are connected to the bottom of the crane hook and both sides of the steel wire rope, and the other ends of the two chain hoists are hooked to the lifting lugs on both sides respectively. When installing the cooling wall of the gap section, the chain hoists on both sides are adjusted to make the spreader arm in a horizontal state.

[0013] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0014] This method facilitates the installation of molten reduction furnaces that are wider at the bottom and narrower at the top, with transition sections. It also ensures the quality of installation of each section of the furnace shell and water-cooled walls. For the conical sections, gas chamber tops, and gasification flues, which are relatively lightweight after assembly and easy to hoist, the method of assembling the water-cooled pipes and shells on the ground and then hoisting them as a whole shortens the installation cycle and improves installation efficiency. The installation of the intermittent cooling walls is convenient and quick using a balanced boom. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the water-cooled wall of the molten reduction furnace of the present invention;

[0016] Figure 2 This is a side view of the installation structure of the water-cooled wall of the molten reduction furnace of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the balance boom of the present invention;

[0018] Figure 4 This is a schematic diagram of the molten reduction furnace after installation according to the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the conical cooling wall of the present invention;

[0020] Figure 6 This is a schematic diagram of the structure of the conical cooling wall of the present invention after the outer conical furnace shell has been removed after assembly;

[0021] Figure 7 This is a schematic diagram of the straight cylindrical cooling wall structure of the present invention;

[0022] Figure 8 This is a schematic diagram of the structure of the straight cylindrical cooling wall of the present invention after the outer straight cylindrical furnace shell is removed.

[0023] The following are marked in the diagram: 1. Straight section furnace shell; 2. Conical section furnace shell; 3. Gas chamber furnace shell; 4. Gas chamber top cover; 5. Gasification flue shell; 6. Spreader beam; 601. Lifting lug; 602. End plate; 7. Arc plate; 8. Pipe clamp; 9. Counterweight; 10. Crane hook; 11. Wire rope; 12. Chain hoist; 13. Straight section cooling wall; 14. Conical section cooling wall; 15. Gap section cooling wall; 16. Connecting bolt; 17. Cooling wall mounting hole. Detailed Implementation

[0024] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0025] like Figures 1 to 8 As shown, a method for installing water-cooled walls in a molten reduction furnace is described. The furnace shell is divided into several straight cylindrical sections 1, several conical sections 2, several gas chamber sections 3, a gas chamber top cover 4, and a vaporization flue shell 5. The water-cooled walls are divided into several straight cylindrical cooling walls 13, gap cooling walls 15, conical cooling walls 14, gas chamber cooling walls, top cover cooling walls, and vaporization flue cooling walls. The straight cylindrical sections 1, conical sections 2, gas chamber sections 3, and gas chamber sections 5 are also described. Cooling wall mounting holes 17 are pre-drilled on the top cover 4 and the vaporization flue shell 5. Connecting bolts 16, compatible with the cooling wall mounting holes 17, are installed on the straight section cooling wall 13, the gap section cooling wall 15, the conical section cooling wall 14, the gas chamber cooling wall, the top cover cooling wall, and the vaporization flue cooling wall. Assembly is performed on the ground of the conical section furnace shell 2 with the conical section cooling wall 14, the gas chamber top cover 4 with the top cover cooling wall, and the vaporization flue shell 5 with the vaporization flue cooling wall. The installation steps are as follows:

[0026] S1, Straight section installation: Erect a scaffolding platform and use a crane to lift and install the straight section furnace shell 1. Install the straight section cooling wall 13 from bottom to top inside the straight section furnace shell 1. The distance between the upper edge of the uppermost straight section cooling wall 13 and the upper edge of the straight section furnace shell 1 is equal to the height of the gap section cooling wall 15.

[0027] The scaffolding platform is installed inside the reduction furnace. Installation proceeds from bottom to top. After each layer of the straight-tube cooling wall 13 is installed, the next layer of scaffolding platform is erected for installation. First, the longitudinal and transverse axes of the straight-tube cooling wall 13 should be located within the straight-tube furnace shell 1. Then, each straight-tube cooling wall 13 is leveled and aligned according to these axes. After the straight-tube cooling wall 13 is correctly positioned, the connecting bolts 16 on the straight-tube cooling wall 13 are inserted into the corresponding cooling wall mounting holes 17, and the nuts are gradually tightened. The connecting bolts 16 are then welded to the nuts, and the nuts are welded to the washers. Finally, the sealing caps are welded to fix the straight-tube cooling wall 13 to the straight-tube furnace shell 1. The assembly methods for the conical furnace shell 2 and the conical cooling wall 14, the gas chamber top cover 4 and the top cover cooling wall, the vaporization flue shell 5 and the vaporization flue cooling wall, and the connection method for the straight-tube cooling arm 13 and the straight-tube furnace shell 1 are the same.

[0028] S2, Conical Section Installation: The assembled conical section furnace shell 2 and conical section cooling wall 14 are hoisted and fixed to the straight section furnace shell 1 by welding. The gap between the conical section cooling wall 14 and the straight section cooling wall 13 is the reserved installation position for the gap section cooling wall.

[0029] S3, Installation of the interstitial cooling wall 15: The interstitial cooling wall 15 is installed on the balance boom outside the furnace. The balance boom is leveled, and a crane lifts the balance boom into the furnace. The interstitial cooling wall 15 is pushed into the pre-reserved installation position and fixed thereto. The balance boom includes a spreader arm 6, one end of which is provided with an end plate 602. A counterweight hole is provided on the end plate 602, through which a counterweight block 9 is assembled. The other end of the spreader arm 6 is provided with an arc-shaped plate 7. The arc of the arc-shaped plate 7 matches the inner arc of the interstitial cooling wall 15 to be installed, allowing the inner side of the interstitial cooling wall 15 to abut against the arc-shaped plate 7. Pipe clamps 8 are provided at both ends of the arc-shaped plate 7. In this embodiment, U-shaped clamps are used. Figure 2 The pipe clamp 8 can clamp the gap section cooling wall 15, and the connection between the gap section cooling arm 15 and the straight section furnace shell 1 is consistent with the straight section cooling wall 13.

[0030] The spreader 6 is provided with three lifting lugs 601 at intervals. A steel wire rope 11 is connected to the bottom of the crane hook 10, and the other end of the steel wire rope 11 is connected to the lifting lug 601 located in the middle. Two chain hoists 12 are connected to the bottom of the crane hook and on both sides of the steel wire rope 11. The other ends of the two chain hoists 12 are hooked on the lifting lugs 601 on both sides respectively. When leveling the boom, the spreader 6 can be adjusted to make it balanced by adjusting the chain hoists 12 on both sides. When hoisting and installing the cooling wall 15 in the gap section, the spreader 6 is kept in a horizontal state.

[0031] S4, Gas chamber installation: The gas chamber furnace shell 3 is hoisted and welded to the conical section furnace shell 2; the scaffolding platform extends upward layer by layer, and the gas chamber cooling wall is hoisted into the furnace by a crane and installed in the gas chamber furnace shell 3 from bottom to top. The connection between the gas chamber cooling wall and the gas chamber furnace shell 3 is consistent with that between the straight section cooling wall 13 and the straight section furnace shell 1.

[0032] S5, Gas chamber top cover 4 and gasification flue installation: Hoist the assembled gas chamber top cover 4 and top cover cooling wall and install them on the gas chamber furnace shell 3; hoist the assembled gasification flue shell 5 and gasification flue cooling wall and install the gasification flue shell 5 on the gas chamber furnace shell 3.

[0033] It is important to note that during the crane hoisting process, careful observation is necessary to prevent collisions between the water-cooled wall of the molten reduction furnace and the furnace shell.

[0034] This method employs a scaffolding platform and crane-assisted installation for the straight section. The conical section, gas chamber top cover, and vaporization flue, due to their small size and light weight, are installed by assembling the shell and water-cooled wall floor into a single unit, reducing construction difficulty. A balanced boom is used for installations in narrow gaps, facilitating convenience and speed. This novel construction method for molten reduction furnaces (MPR furnaces) improves construction quality, shortens the construction period, and has achieved excellent application results in actual construction.

[0035] 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 changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A method for installing a water-cooled wall in a molten reduction furnace, characterized in that, The water-cooled wall of the molten reduction furnace is divided into several sections: straight cylindrical cooling wall, intermittent cooling wall, conical cooling wall, gas chamber cooling wall, top cover cooling wall, and vaporization flue cooling wall. Assembly of the conical furnace shell with the conical cooling wall, the gas chamber top cover with the top cover cooling wall, and the vaporization flue shell with the vaporization flue cooling wall is performed on the ground. The installation steps are as follows: S1, Straight section installation: Erect a scaffolding platform and use a crane to lift and install the straight section furnace shell. Install the straight section cooling wall from bottom to top inside the straight section furnace shell. The distance between the upper edge of the uppermost straight section cooling wall and the upper edge of the straight section furnace shell is equal to the height of the gap section cooling wall. S2, Conical Section Installation: The assembled conical section furnace shell and conical section cooling wall are hoisted and installed. The conical section furnace shell and the straight section furnace shell are welded and fixed. The gap between the conical section cooling wall and the straight section cooling wall is the reserved installation position for the gap section cooling wall. S3, Installation of intermittent cooling wall: Install the intermittent cooling wall on the balance boom outside the furnace, level the balance boom, and use a crane to lift the balance boom into the furnace, then push the intermittent cooling wall into the reserved installation position of the intermittent cooling wall; The balance boom includes a spreader, one end of which is equipped with a counterweight, and the other end is equipped with an arc-shaped plate. The inner side of the gap section cooling wall abuts against the arc-shaped plate, and pipe clamps are provided at both ends of the arc-shaped plate to clamp the gap section cooling wall. S4, Gas chamber installation: The gas chamber furnace shell is hoisted and welded to the conical section of the furnace shell; the scaffolding platform extends upward, and a crane is used to hoist the gas chamber cooling wall into the furnace, which is then installed inside the gas chamber furnace shell from bottom to top. S5, Gas chamber top cover and gasification flue installation: Hoist the assembled gas chamber top cover and top cover cooling wall and install them on the gas chamber furnace shell; hoist the assembled gasification flue shell and gasification flue cooling wall and install the gasification flue shell on the gas chamber furnace shell.

2. The method for installing the water-cooled wall of a molten reduction furnace according to claim 1, characterized in that: In step S3, three lifting lugs are spaced apart on the spreader arm of the balance boom. A steel wire rope is connected to the bottom of the crane hook, and the other end of the steel wire rope is connected to the lifting lug located in the middle. Two chain hoists are connected to the bottom of the crane hook and on both sides of the steel wire rope. The other ends of the two chain hoists are hooked on the lifting lugs on both sides. When installing the cooling wall of the gap section, the chain hoists on both sides are adjusted to make the spreader arm horizontal.

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