Electric furnace lining structure capable of recovering heat energy

Abstract

The utility model belongs to the field of electric furnace lining structures, and particularly relates to an electric furnace lining structure capable of recovering heat energy, which comprises a furnace bottom heat exchange system and a furnace wall heat exchange system, the furnace bottom heat exchange system is arranged in a furnace bottom refractory ramming material, and the furnace wall heat exchange system is arranged in a furnace wall refractory brick; the furnace bottom heat exchange system comprises a furnace bottom air inlet pipe, a furnace bottom air outlet pipe and a furnace bottom branch pipe, one end of the furnace bottom branch pipe is connected with the furnace bottom air inlet pipe, and the other end is connected with the furnace bottom air outlet pipe; the furnace wall heat exchange system comprises a furnace wall air inlet pipe, a furnace wall air outlet pipe and a furnace wall branch pipe, one end of the furnace wall branch pipe is connected with the furnace wall air inlet pipe, and the other end is connected with the furnace wall air outlet pipe; the furnace bottom air inlet pipe and the furnace wall air inlet pipe are connected with an air blower, and the furnace bottom air outlet pipe and the furnace wall air outlet pipe are connected with a rotary kiln; the thickness of the lining of the furnace body can be reduced through the heat exchange system between the furnace wall and the furnace bottom, and the building cost is saved.

Description

Technical Field

[0001] The utility model belongs to the field of electric furnace lining structures, and in particular relates to an electric furnace lining structure capable of recovering heat energy. Background Art

[0002] The electric furnace is composed of a furnace cover, a furnace wall and a furnace bottom. The outer shell of the electric furnace is a steel plate, and the furnace is covered with a lining to isolate the high-temperature melt. The lining is made of refractory materials, including the furnace bottom, furnace wall, and molten pool. The furnace bottom is made of refractory ramming material and the furnace wall is built of refractory bricks. Electric furnace smelting uses electricity as the main heat source, using three-phase AC or DC power. An arc is directly generated between the charge and the power, and the charge is melted at high temperature by the arc. During the smelting process, the refractory material of the electric furnace lining will be damaged by arc heat, penetration of high-temperature liquid metal, and chemical erosion of complex slag components. Therefore, in order to overcome the above-mentioned effects, the furnace lining is designed to be thicker at this stage, which makes the furnace body construction cost higher. For example, the construction cost of a 33000KVA electric furnace is as high as 10 million yuan. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides an electric furnace lining structure which can reduce the thickness of the electric furnace lining and effectively recover the heat conducted by the lining.

[0004] The invention discloses an electric furnace lining structure capable of recovering heat energy, comprising a furnace bottom heat exchange system and a furnace wall heat exchange system, wherein the furnace bottom heat exchange system is arranged in a furnace bottom refractory ramming material, and the furnace wall heat exchange system is arranged in a furnace wall refractory brick; the furnace bottom heat exchange system comprises a furnace bottom air inlet pipe, a furnace bottom air outlet pipe, and a furnace bottom branch pipe, wherein one end of the furnace bottom branch pipe is connected to the furnace bottom air inlet pipe, and the other end is connected to the furnace bottom air outlet pipe; the furnace wall heat exchange system comprises a furnace wall air inlet pipe, a furnace wall air outlet pipe, and a furnace wall branch pipe, wherein one end of the furnace wall branch pipe is connected to the furnace wall air inlet pipe, and the other end is connected to the furnace wall air outlet pipe; the furnace bottom air inlet pipe and the furnace wall air inlet pipe are connected to a blower, and the furnace bottom air outlet pipe and the furnace wall air outlet pipe are connected to a rotary kiln.

[0005] A plurality of furnace bottom branch pipes of the furnace bottom heat exchange system are arranged in sequence from the outside to the inside along the circumference of the furnace bottom, and the furnace bottom branch pipes are 500-1000 mm away from the bottom of the molten pool.

[0006] A plurality of furnace wall branch pipes of the furnace wall heat exchange system are arranged in sequence from top to bottom along the circumference of the furnace wall, and the furnace wall branch pipes are 500-1000 mm away from the edge of the furnace wall molten pool.

[0007] Flow regulating valves are respectively arranged on the pipelines connecting the blower with the furnace bottom air inlet pipe and the furnace wall air inlet pipe.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] 1. The heat exchange system between the furnace wall and the furnace bottom can reduce the thickness of the furnace lining and save the masonry cost.

[0010] 2. The gas exchanged at the furnace bottom and furnace wall is used to supplement the heat for roasting in the rotary kiln, which can save energy consumption in the rotary kiln and reduce fuel costs.

[0011] 3. The heat exchange system between the furnace bottom and the furnace wall reduces the temperature of the inner lining and can increase the service life of the inner lining of the furnace.

[0012] 4. The heat exchange system between the furnace bottom and the furnace wall recovers the heat energy of the electric furnace, improves the utilization coefficient of the electric furnace energy consumption, and saves electricity consumption costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of an embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the furnace bottom heat exchange system of the utility model;

[0015] Figure 3 This is a schematic diagram of the furnace wall heat exchange system of the utility model;

[0016] In the figure: 1. electric furnace lining, 11. furnace bottom refractory ramming material, 12. furnace wall refractory bricks, 13. molten pool, 2. furnace bottom heat exchange system, 21. furnace bottom air inlet pipe, 22. furnace bottom air outlet pipe, 23. furnace bottom branch pipe, 3. furnace wall heat exchange system, 31. furnace wall air inlet pipe, 32. furnace wall air outlet pipe, 33. furnace wall branch pipe, 4. blower, 5. rotary kiln. DETAILED DESCRIPTION

[0017] The present invention is further described below with reference to the embodiments.

[0018] like Figure 1 As shown, the electric furnace lining 1 in the utility model includes a furnace bottom, a furnace wall and a molten pool 13. The furnace bottom is made of refractory ramming material by vibration, and the furnace wall is built with refractory bricks. The furnace bottom and the furnace wall constitute the electric furnace molten pool 13, and the charge is smelted in the molten pool 13 by electric energy.

[0019] like Figure 1-3As shown, an electric furnace lining structure capable of recovering heat energy comprises a furnace bottom heat exchange system 2 and a furnace wall heat exchange system 3, wherein the furnace bottom heat exchange system 2 is arranged in a furnace bottom refractory ramming material 11, and the furnace wall heat exchange system 3 is arranged in a furnace wall refractory brick 12; the furnace bottom heat exchange system 2 comprises a furnace bottom air inlet pipe 21, a furnace bottom air outlet pipe 22, and a furnace bottom branch pipe 23, wherein one end of the furnace bottom branch pipe 23 is connected to the furnace bottom air inlet pipe 21, and the other end is connected to the furnace bottom air outlet pipe 22; the furnace wall heat exchange system 3 comprises a furnace wall air inlet pipe 31 , furnace wall air outlet pipe 32, furnace wall branch pipe 33, one end of the furnace wall branch pipe 33 is connected to the furnace wall air inlet pipe 31, and the other end is connected to the furnace wall air outlet pipe 32, the furnace bottom air inlet pipe 21 and the furnace wall air inlet pipe 31 are connected to the blower 4, the furnace bottom air outlet pipe 22 and the furnace wall air outlet pipe 32 are connected to the rotary kiln 5, the rotary kiln 5 is the roasting part of the electric furnace charge, the rotary kiln includes a kiln head, a kiln tail, and a kiln body, hot air is provided in the kiln head, the hot air enters the kiln tail from the kiln head along the kiln body and contacts with the charge entering in the reverse direction for roasting.

[0020] A plurality of furnace bottom branch pipes 23 of the furnace bottom heat exchange system 2 are sequentially arranged along the circumference of the furnace bottom from the outside to the inside, and the furnace bottom branch pipes 23 are 500-1000 mm away from the bottom of the molten pool 13 .

[0021] A plurality of furnace wall branch pipes 33 of the furnace wall heat exchange system 3 are sequentially arranged along the circumference of the furnace wall from top to bottom, and the furnace wall branch pipes 33 are 500-1000 mm away from the edge of the furnace wall molten pool 13 .

[0022] Flow regulating valves are respectively provided on the connecting pipelines of the blower 4 and the furnace bottom air inlet pipe 21 and the furnace wall air inlet pipe 31. The blower 4 provides cooling air for the furnace bottom heat exchange system 2 and the furnace wall heat exchange system 3. The flow regulating valves adjust the flow of the furnace wall air inlet pipe 31 and the furnace bottom air inlet pipe 21 according to the temperature of the furnace wall and the furnace bottom.

[0023] In the utility model, the furnace bottom branch pipe 23 and the furnace wall branch pipe 33 exchange heat with the cooling gas and gather in the furnace bottom outlet pipe 22 and the furnace wall outlet pipe 32. The heat exchanged gas runs along the furnace bottom outlet pipe 22 and the furnace wall outlet pipe 32 and enters the rotary kiln head to be used for roasting heat supplement of the charge entering the electric furnace.

[0024] The principle of the utility model is as follows: during smelting in an electric furnace, the blower 4 is started, and cooling air is introduced through the connecting pipelines between the blower 4 and the furnace bottom air inlet pipe 21 and the furnace wall air inlet pipe 31. The introduced cooling air enters into a plurality of furnace bottom branch pipes 23 and furnace wall branch pipes 33 respectively through the furnace bottom air inlet pipe 21 and the furnace wall air inlet pipe 31. The cooling air in the furnace bottom branch pipes 23 and the furnace wall branch pipes 33 exchanges heat with the heat conducted by the electric furnace lining to reduce the temperature in the lining. The heat exchanged gases of the plurality of furnace bottom branch pipes 23 and the furnace wall branch pipes 33 enter into the furnace bottom air outlet pipe 22 and the furnace wall air outlet pipe 32 to be collected. The collected hot air enters into the kiln head of the rotary kiln 5 along the pipeline to be used for roasting heat supplement of the charge entering the electric furnace.

Claims

1. An electric furnace lining structure capable of recovering heat energy, characterized in that: It includes a furnace bottom heat exchange system and a furnace wall heat exchange system. The furnace bottom heat exchange system is arranged in the furnace bottom refractory ramming material, and the furnace wall heat exchange system is arranged in the furnace wall refractory bricks; the furnace bottom heat exchange system includes a furnace bottom air inlet pipe, a furnace bottom air outlet pipe, and a furnace bottom branch pipe, one end of the furnace bottom branch pipe is connected to the furnace bottom air inlet pipe, and the other end is connected to the furnace bottom air outlet pipe; the furnace wall heat exchange system includes a furnace wall air inlet pipe, a furnace wall air outlet pipe, and a furnace wall branch pipe, one end of the furnace wall branch pipe is connected to the furnace wall air inlet pipe, and the other end is connected to the furnace wall air outlet pipe; the furnace bottom air inlet pipe and the furnace wall air inlet pipe are connected to the blower, and the furnace bottom air outlet pipe and the furnace wall air outlet pipe are connected to the rotary kiln.

2. The electric furnace lining structure capable of recovering heat energy according to claim 1, characterized in that: A plurality of furnace bottom branch pipes of the furnace bottom heat exchange system are arranged in sequence from the outside to the inside along the circumference of the furnace bottom, and the furnace bottom branch pipes are 500-1000 mm away from the bottom of the molten pool.

3. The electric furnace lining structure capable of recovering heat energy according to claim 1, characterized in that: A plurality of furnace wall branch pipes of the furnace wall heat exchange system are arranged in sequence from top to bottom along the circumference of the furnace wall, and the furnace wall branch pipes are 500-1000 mm away from the edge of the furnace wall molten pool.

4. The electric furnace lining structure capable of recovering heat energy according to claim 1, characterized in that: Flow regulating valves are respectively arranged on the pipelines connecting the blower with the furnace bottom air inlet pipe and the furnace wall air inlet pipe.

Images