Refractory online repairing tool for preheating kiln of large submerged arc furnace

Abstract

The utility model relates to the field of online repair of a preheating kiln of a submerged arc furnace. An online repair tool for refractory materials of a preheating kiln of a large submerged arc furnace comprises a container 1 with an opening, a flange cover 2 connected with the opening of the container 1 in a sealed mode through a bolt 3, an air inlet pipe 5 connected to the upper portion of the side wall of the container 1 and a discharging pipe 4 connected to the upper portion of the side wall of the container 1, and an inner cavity of the container 1 is connected with an air pump through the air inlet pipe 5. An inner cavity of the container 1 is connected with an external spray gun through a discharging pipe 4, a first valve 11 is installed on the air inlet pipe 5, a second valve 8 is installed on the discharging pipe 4, the center of the flange cover 2 is vertically and upwards connected with a feeding pipe 6, the top of the feeding pipe 6 is connected with a funnel 7, a third valve 9 is installed on the feeding pipe 6, and an air pressure measuring instrument 10 is installed on the air inlet pipe. The device is easy to manufacture, low in cost, easy and convenient to operate, practical and capable of rapidly and specifically repairing problems existing in field refractory materials.

Description

Technical Field

[0001] The utility model relates to the field of online repairing of a preheating kiln of an ore-fired furnace. Background Art

[0002] The preheating kiln (large preheating kiln) of the ferrochrome smelting ore-heating furnace is subjected to factors such as temperature, flue gas, heat exchange, and material wear. It uses high-grade refractory materials, and the construction is also overall masonry and partial pouring, forming in one go. With use, the refractory materials in the preheating kiln body have aged and broken, especially the high-temperature parts of the combustion chamber, which have been severely damaged, and there have been problems such as local red-burning and flue gas leakage, which threaten the safety of production and the life and health of operators.

[0003] Since it takes 1 to 1.5 months to replace the refractory materials in the preheating kiln, and the maintenance requires the shutdown of the ore-arcing furnace, which has a significant impact on daily production, online repair of the refractory materials in the preheating kiln has become a difficult problem faced in the production process.

[0004] The existing online repair of refractory materials in preheating kilns uses spray gun spraying. New refractory materials are placed in a container. By pressurizing the container, the new refractory materials are pressed from the container into the part of the preheating kiln where the smoke is leaking through the spray gun to repair the refractory materials in that part. The existing problems are: loading new refractory materials takes a long time and the procedures are cumbersome. Every time new refractory materials are loaded, the upper plugging plate (flange cover) needs to be removed. After the refractory materials are loaded, they need to be plugged again, and the sealing must be good during installation to ensure that the pressure in the container is maintained. The pressure in the container is not controlled and cannot meet the process requirements. There is a risk that the refractory materials inside the preheating kiln will be damaged due to excessive pressure. When new refractory materials are loaded again, the pressure in the container cannot be relieved. When the upper plugging plate is directly removed, there is a risk of sudden collapse and injury. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to provide an online repair tool for refractory materials of a preheating kiln of a large-scale ore-fired furnace to solve various problems existing in the background technology.

[0006] The technical solution adopted by the utility model is: an online repair tool for refractory materials of a large-scale ore-fired furnace preheating kiln, comprising an open container 1, a flange cover 2 sealed and connected to the mouth of the container 1 by bolts 3, an air inlet pipe 5 connected to the upper part of the side wall of the container 1, and a discharge pipe 4 connected to the upper part of the side wall of the container 1, the inner cavity of the container 1 is connected to the air pump through the air inlet pipe 5, the inner cavity of the container 1 is connected to the external spray gun through the discharge pipe 4, a first valve 11 is installed on the air inlet pipe 5, a second valve 8 is installed on the discharge pipe 4, the center of the flange cover 2 is vertically connected to the feed pipe 6, the top of the feed pipe 6 is connected to the funnel 7, the feed pipe 6 is installed with a third valve 9, and an air pressure measuring instrument 10 is installed on the air inlet pipe.

[0007] The inner diameter of the discharge pipe 4 is 25-40 mm.

[0008] The inner diameter of the air intake pipe 5 is 20-30 mm.

[0009] The inner diameter of the feed pipe 6 is 35-45 mm.

[0010] The measuring range of the air pressure measuring instrument 10 is 100 mbar-10 MPa.

[0011] The air pump is an integrated machine for extracting and compressing air.

[0012] The air inlet pipe 5 inside the container 1 is an L-shaped structure, and the port of the air inlet pipe 5 inside the container 1 is 1-3 cm away from the lower surface of the flange cover 2 and opens upward.

[0013] The utility model has the following beneficial effects: the utility model is simple to manufacture, low in cost, easy to operate and practical, and can quickly carry out targeted repairs on the problems existing in the on-site refractory materials, thereby extending the service life of the preheating kiln and solving the contradiction with the production of the ore-fired furnace. When loading new refractory materials, it is only necessary to open the valve at the bottom of the funnel to load the refractory materials into the container. There is no need to frequently open the flange cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the prior art;

[0016] Figure 3 It is a schematic diagram of the L-shaped structure of the intake pipe;

[0017] Among them, 1. container, 2. flange cover, 3. bolts, 4. discharge pipe, 5. air inlet pipe, 6. feed pipe, 7. funnel, 8. second valve, 9. third valve, 10. air pressure measuring instrument, 11. first valve. DETAILED DESCRIPTION

[0018] Shanxi TISCO Wanbang Furnace Material Co., Ltd. owns two ferrochrome smelting submerged arc furnaces, which were put into operation in May 2014 and April 2015 respectively. The main equipment and technology of the submerged arc furnaces were introduced from Finland's Outotec Company and are at the world's leading level.

[0019] This type of ore-fired furnace is the largest ferrochrome smelting ore-fired furnace introduced in China, with a capacity of 75MVA. Its supporting furnace top preheating facility, namely the preheating kiln, is unique in China. Its principle is: the coal gas produced by the ore-fired furnace is burned to produce high-temperature flue gas, which flows from bottom to top, and the room temperature furnace charge enters the preheating kiln from top to bottom. During the mutual movement, heat is exchanged, and the temperature of the incoming furnace charge is increased from room temperature to 400~450℃, and the electricity consumption per ton of iron smelting can be saved by about 300℃.

[0020] In the early design stage, the interior of the preheating kiln was designed to withstand factors such as temperature, flue gas, heat exchange, and material wear. The construction was also completed by overall masonry and partial pouring, and formed in one step. As the service life increased, the refractory materials in the preheating kiln body began to age and break, especially the high-temperature parts of the combustion chamber, which were severely damaged. There were local red-hot parts and flue gas leakage, which threatened the safety of production and the life and health of operators. Since the replacement of the preheating kiln refractory materials takes 1 to 1.5 months, and the maintenance requires the shutdown of the submersible arc furnace, which has a great impact on daily production, the online repair of the preheating kiln refractory materials has become a difficult problem faced in the production process.

[0021] like Figure 1-3 As shown, Figure 2 It is a schematic diagram of the existing online repair tool for refractory materials of the preheating kiln of a large-scale ore-fired furnace. During the production process of the ore-fired furnace, the preheating system will be stopped alone, and new refractory materials will be pressed into the damaged parts of the preheating kiln refractory materials to repair the damaged and leaking parts, eliminate unsafe factors such as local redness and smoke leakage, extend the service life of the preheating kiln, reduce the production cost of ferrochrome smelting, and give full play to the economic advantages of large-scale ore-fired furnaces.

[0022] Use a section of ø500mm×600mm steel pipe to make a container, seal the bottom and weld a ø32mm short pipe (with valve) on the side away from the bottom and connect it to the spray gun; the mouth of the container is sealed by a flange cover, and a ø25mm short pipe (with valve) is welded 150mm away from the upper flange and connected to the on-site high-pressure air source (or air pump); after putting the new refractory into the container (open the flange cover to install), install and seal the flange cover, and use high-pressure gas to press the new refractory into the preheating kiln.

[0023] Problems:

[0024] 1. Loading new refractory materials takes a long time and the procedures are complicated. Each time new refractory materials are loaded, the upper plugging plate needs to be removed, and the plugging plate needs to be closed again after the refractory materials are loaded, and the sealing must be good to ensure that the pressure in the container is maintained.

[0025] 2. The pressure inside the container is not controlled and cannot meet the process requirements. There is a risk that the internal refractory materials of the preheating air will be damaged due to excessive pressure.

[0026] 3. When new refractory materials are loaded again, the pressure in the container cannot be relieved. When the upper plugging plate is directly removed, there is a risk of sudden collapse and injury.

[0027] The utility model improves the existing technology.

[0028] A large-scale ore-fired furnace preheating kiln refractory online repair tool, comprising an open container 1, a flange cover 2 sealed with the mouth of the container 1 by bolts 3, an air inlet pipe 5 connected to the upper part of the side wall of the container 1, and a discharge pipe 4 (with an inner diameter of 35 mm) connected to the upper part of the side wall of the container 1. The inner cavity of the container 1 is connected to an air pump (an integrated air pump and air compressor) through the air inlet pipe 5 (with an inner diameter of 25 mm), and the inner cavity of the container 1 is connected to an external spray gun through the discharge pipe 4. A first valve 11 is installed on the air inlet pipe 5, and a second valve 8 is installed on the discharge pipe 4. The center of the flange cover 2 is vertically connected to a feed pipe 6 (with an inner diameter of 40 mm), and the top of the feed pipe 6 is connected to a funnel 7. When loading new refractory, it is only necessary to open the valve at the bottom of the funnel to load the refractory into the container. A third valve 9 is installed on the feed pipe 6, and an air pressure measuring instrument 10 (with a measuring range of 100 mbar-10 MPa) is installed on the air inlet pipe. When the pressure displayed by the air pressure measuring instrument 10 reaches the process requirement, the air pump is cut off in time.

[0029] Opening the third valve can relieve the pressure in the container, and water can also be passed into the container to flush and clear the blocked refractory material.

[0030] In one embodiment, the air inlet pipe 5 inside the container 1 is an L-shaped structure, and the port of the air inlet pipe 5 inside the container 1 is 1-3 cm away from the lower surface of the flange cover 2 and opens upward.

Claims

1. An online repair tool for refractory materials of a large-scale submerged arc furnace preheating kiln, comprising an open container (1), a flange cover (2) sealedly connected to the mouth of the container (1) by bolts (3), an air inlet pipe (5) connected to the upper part of the side wall of the container (1), and a discharge pipe (4) connected to the upper part of the side wall of the container (1), the inner cavity of the container (1) is connected to an air pump through the air inlet pipe (5), and the inner cavity of the container (1) is connected to an external spray gun through the discharge pipe (4), a first valve (11) is installed on the air inlet pipe (5), and a second valve (8) is installed on the discharge pipe (4), characterized in that: The center of the flange cover (2) is vertically connected to the feed pipe (6), the top of the feed pipe (6) is connected to the funnel (7), a third valve (9) is installed on the feed pipe (6), and an air pressure measuring instrument (10) is installed on the air intake pipe.

2. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The inner diameter of the discharge pipe (4) is 25-40 mm.

3. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The inner diameter of the air intake pipe (5) is 20-30 mm.

4. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The inner diameter of the feed pipe (6) is 35-45 mm.

5. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The range of the air pressure measuring instrument (10) is 100 mbar -10 MPa.

6. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The air pump is an integrated machine for extracting and compressing air.

7. According to claim 1, a large-scale submerged arc furnace preheating kiln refractory online repair tool is characterized by: The air inlet pipe (5) inside the container (1) is an L-shaped structure. The port of the air inlet pipe (5) inside the container (1) is 1-3 cm away from the lower surface of the flange cover (2) and opens upward.

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