Feeding device of fused magnesia furnace

Abstract

The utility model discloses a feeding device of a fused magnesia furnace, which relates to the technical field of waste heat recovery, and comprises a furnace body, a gas collecting tank, an exhaust pipe, a gas inlet pipe, a gas outlet pipe, a permeable plate and a connecting pipe, the gas collecting tank is arranged on the upper surface of the furnace body through a connecting column, and the bottom of the gas collecting tank is opened and is communicated and connected with the inside of the furnace body through the connecting pipe; the connecting pipe is provided with a gate valve, the ventilating plate is funnel-shaped and is uniformly provided with a plurality of ventilating holes, the ventilating plate is arranged in the gas collecting box, the upper part of the ventilating plate is fixedly connected with the top edge of the gas collecting box, the bottom of the ventilating plate is communicated and connected with the upper end of the connecting pipe, and a feeding hole is formed in one side of the upper surface of the gas collecting box; the gas collecting box is arranged on the furnace body in a communicated mode, the funnel-shaped permeable plate is arranged in the gas collecting box, high-temperature flue gas in the exhaust pipe passes through the gas collecting box and preheats raw materials on the permeable plate through the permeable plate, the purpose of recycling flue gas waste heat is achieved, and the energy utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a feeding device for an electric fused magnesia furnace. Background Art

[0002] Fused magnesia is a general term for the products of magnesia raw materials such as magnesia that have been sintered after high-temperature treatment. The magnesia made from natural magnesia as raw material by a single calcination or two-step calcination process using high-temperature equipment such as vertical kilns and rotary kilns is called sintered magnesia, and the magnesia made from magnesia ore and other raw materials that has been smelted in an electric arc furnace to a molten state and then cooled is called fused magnesia.

[0003] The melting temperature of fused magnesia is above 2750℃. Therefore, a large amount of high-temperature flue gas will be discharged from the furnace during the production and processing. In the context of energy conservation, emission reduction and improving resource utilization, it is very necessary to reuse the heat of the high-temperature flue gas discharged from the fused magnesia furnace. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a feeding device for an electric fused magnesia sand furnace, in which an air collecting box is connected to the furnace body, and a funnel-shaped air permeable plate is arranged in the air collecting box. The high-temperature flue gas in the exhaust pipe passes through the air collecting box and the air permeable plate to preheat the raw materials on the air permeable plate, thereby achieving the purpose of recycling the waste heat of the flue gas and improving the energy utilization rate.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A feeding device for an electric molten magnesia furnace comprises a furnace body, an air collecting box, an exhaust pipe, an air inlet pipe, an air outlet pipe, a breathable plate and a connecting pipe, the air collecting box is arranged on the upper surface of the furnace body through a connecting column, the bottom of the air collecting box is opened and is connected to the furnace body through a connecting pipe, a plug valve is arranged on the connecting pipe, the breathable plate is funnel-shaped and is evenly provided with a plurality of breathable holes, the breathable plate is arranged in the air collecting box and the upper part is fixedly connected to the top edge of the air collecting box, the bottom of the breathable plate is connected to the upper end of the connecting pipe, a feeding port is arranged on one side of the upper surface of the air collecting box, a cover plate that can be opened or closed is arranged on the feeding port, the exhaust pipe is connected to the upper part of the furnace body, one end of the air inlet pipe is connected to the exhaust pipe, and the other end is connected to the air collecting box, a first valve is arranged on the air inlet pipe, one end of the air outlet pipe is connected to the center position of the upper surface of the air collecting box, and the other end is connected to the exhaust pipe, a second valve is arranged on the air outlet pipe, and a third valve is arranged between the positions where the air inlet pipe and the air outlet pipe are respectively connected to the exhaust pipe.

[0007] Preferably, a partition is provided in the air collecting box at a position corresponding to below the air permeable plate, a plurality of through holes are evenly provided on the partition, and the air inlet pipe is located in a cavity formed by the partition and the air collecting box.

[0008] Preferably, a monitoring component is provided on the top of the gas collecting box, and the monitoring component includes a temperature monitor and a pressure monitor.

[0009] Preferably, the air holes on the air permeable plate are arranged horizontally.

[0010] The utility model provides a feeding device for a fused magnesia furnace, which has the following beneficial effects:

[0011] 1. The utility model is connected to the furnace body and is provided with an air collecting box, in which a funnel-shaped air permeable plate is provided, so that the high-temperature flue gas in the exhaust pipe passes through the air collecting box and the air permeable plate to preheat the raw materials on the air permeable plate, so as to achieve the purpose of recycling the waste heat of the flue gas and improve the energy utilization rate;

[0012] 2. In the utility model, a circle of partitions is arranged below the air permeable plate in the air collecting box, and through holes are evenly opened on the partitions. The smoke from the air intake pipe first enters the space between the partitions and the air collecting box to increase the pressure so that the smoke can fill the space, and then the raw materials are heated through the through holes and air permeable holes to ensure the uniformity of the smoke in the air collecting box and fully preheat the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a front cross-sectional view of a feeding device for an electric fused magnesia furnace.

[0014] In the figure: 1. furnace body; 2. exhaust pipe; 3. first valve; 4. air inlet pipe; 5. air collecting box; 6. third valve; 7. second valve; 8. monitoring component; 9. air outlet pipe; 10. air vent; 11. air permeable plate; 12. cover plate; 13. feed port; 14. partition; 15. through hole; 16. connecting column; 17. gate valve; 18. connecting pipe. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1As shown, a feeding device for an electric molten magnesia furnace comprises a furnace body 1, an air collecting box 5, an exhaust pipe 2, an air inlet pipe 4, an air outlet pipe 9, an air permeable plate 11 and a connecting pipe 18, wherein the air collecting box 5 is arranged on the upper surface of the furnace body 1 through a connecting column 16, the bottom of the air collecting box 5 is open and is connected to the furnace body 1 through a connecting pipe 18, a plug valve 17 is arranged on the connecting pipe 18, the air permeable plate 11 is funnel-shaped and is evenly provided with a plurality of air holes 10, the air permeable plate 11 is arranged in the air collecting box 5 and the upper part is fixedly connected to the top edge of the air collecting box 5, the bottom of the air permeable plate 11 is connected to the upper end of the connecting pipe 18, a feed port 13 is arranged on one side of the upper surface of the air collecting box 5, a cover plate 12 which can be opened or closed is arranged on the feed port 13, the exhaust pipe 2 is connected to the upper part of the furnace body 1, One end of the air inlet pipe 4 is connected to the exhaust pipe 2, and the other end is connected to the air collecting box 5. A first valve 3 is arranged on the air inlet pipe 4. One end of the air outlet pipe 9 is connected to the center position of the upper surface of the air collecting box 5, and the other end is connected to the exhaust pipe 2. A second valve 7 is arranged on the air outlet pipe 9. A third valve 6 is arranged between the connection points of the air inlet pipe 4 and the air outlet pipe 9 with the exhaust pipe 2 respectively; a partition 14 is arranged at a position corresponding to below the air permeable plate 11 in the air collecting box 5, and a plurality of through holes 15 are evenly arranged on the partition 14, and the air inlet pipe 4 is located in a cavity formed by the partition 14 and the air collecting box 5; a monitoring component 8 is arranged on the top of the air collecting box 5, and the monitoring component 8 includes a temperature monitor and a pressure monitor; the air holes 10 on the air permeable plate 11 are arranged horizontally.

[0017] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process, which are as follows:

[0018] The furnace body 1 in the utility model refers to a part of the electric fused magnesia furnace, and the other parts are prior art and are not drawn and described in the drawings. The utility model is used when the electric fused magnesia furnace is working and can generate high-temperature smoke.

[0019] According to the instruction manual Figure 1It can be seen that when the utility model is used, the first valve 3 and the second valve 7 are first closed, the gate valve 17 is closed, and the third valve 6 is opened. The flue gas is discharged from the exhaust pipe 2 normally. The cover plate 12 on the feed port 13 is opened, and raw materials are put into the feed port 13 through external equipment or personnel. The raw materials are in the form of blocks of magnesite. The raw materials are accumulated on the air permeable plate 11 in the air collecting box 5, and the cover plate 12 is covered. At this time, the first valve 3 and the second valve 7 are opened, and the third valve 6 is closed. The high-temperature flue gas coming out of the furnace body 1 passes through the exhaust pipe 2 and the air inlet pipe 4 and enters the air collecting box 5. The raw materials on the air permeable plate 11 are heated through the air holes 10 on the air permeable plate 11. The flue gas then enters the exhaust pipe 2 from the outlet pipe 9 and is then discharged to the external flue gas treatment system. The control of the gate valve 17 can put the preheated raw materials on the air permeable plate 11 into the furnace body 1. The utility model preheats the raw materials through the flue gas with a higher temperature, so as to achieve the purpose of reusing the waste heat of the flue gas and improve the energy utilization rate.

[0020] Among them, a partition 14 is arranged at a position corresponding to the bottom of the air permeable plate 11 in the air collecting box 5, and a plurality of through holes 15 are evenly arranged on the partition 14. The air inlet pipe 4 is located in the cavity formed by the partition 14 and the air collecting box 5. The number of through holes 15 is far less than the air permeable holes 10. When the smoke enters the cavity formed by the partition 14 and the air collecting box 5, the pressure will increase so that the smoke can fill the space. The raw materials are heated through the through holes 15 and the air permeable holes 10 to ensure the uniformity of the smoke in the air collecting box 5 and to fully preheat the raw materials.

[0021] A monitoring component 8 is provided on the top of the gas collecting box 5. The monitoring component 8 includes a temperature monitor and a pressure monitor, which are used to monitor the working conditions in the gas collecting box 5 to ensure the normal operation.

[0022] Among them, the air holes 10 on the air permeable plate 11 are arranged horizontally. According to the attached drawings, it can be seen that the flue gas can be in contact with the raw materials more fully, which accelerates the preheating and temperature rise, and improves the energy utilization rate.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feeding device for a fused magnesia furnace, characterized in that: The invention comprises a furnace body (1), an air collecting box (5), an exhaust pipe (2), an air inlet pipe (4), an air outlet pipe (9), an air permeable plate (11) and a connecting pipe (18); the air collecting box (5) is arranged on the upper surface of the furnace body (1) through a connecting column (16); the bottom of the air collecting box (5) is open and is connected to the furnace body (1) through a connecting pipe (18); a plug valve (17) is arranged on the connecting pipe (18); the air permeable plate (11) is funnel-shaped and is evenly provided with a plurality of air permeable holes (10); the air permeable plate (11) is arranged in the air collecting box (5) and the upper part is fixedly connected to the top edge of the air collecting box (5); the bottom of the air permeable plate (11) is connected to the upper end of the connecting pipe (18); A feed port (13) is provided on one side of the upper surface of the gas collecting box (5), and a cover plate (12) that can be opened or closed is provided on the feed port (13); the exhaust pipe (2) is connected to the upper part of the furnace body (1); one end of the air inlet pipe (4) is connected to the exhaust pipe (2), and the other end is connected to the gas collecting box (5); a first valve (3) is provided on the air inlet pipe (4); one end of the air outlet pipe (9) is connected to the center position of the upper surface of the gas collecting box (5), and the other end is connected to the exhaust pipe (2); a second valve (7) is provided on the air outlet pipe (9); and a third valve (6) is provided between the positions where the air inlet pipe (4) and the air outlet pipe (9) are connected to the exhaust pipe (2).

2. A fused magnesia furnace feeding device according to claim 1, characterized in that: A partition plate (14) is arranged in the air collecting box (5) at a position corresponding to the bottom of the air permeable plate (11), and a plurality of through holes (15) are evenly arranged on the partition plate (14). The air intake pipe (4) is located in a cavity formed by the partition plate (14) and the air collecting box (5).

3. The fused magnesia furnace feeding device according to claim 1, characterized in that: A monitoring component (8) is arranged on the top of the gas collecting box (5), and the monitoring component (8) comprises a temperature monitor and a pressure monitor.

4. The fused magnesia furnace feeding device according to claim 1, characterized in that: The air holes (10) on the air permeable plate (11) are arranged horizontally.

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