CN203203381U - Furnace bar type natural gas cupola carbon heat exchange bed - Google Patents

Abstract

The utility model discloses a grate-type natural gas cupola carbon heat exchange bed, which comprises a furnace body, a water-cooled grate is arranged at the lower part of the inner middle of the furnace body, and a heat-exchange bed is arranged above the water-cooled grate, and the heat-exchange bed is A mixture of carbonaceous blocks and high-temperature-resistant ceramic balls; several air outlets are provided on the upper furnace wall of the water-cooled grate; a metal charge is arranged above the heat exchange bed, and several layers of coke are arranged inside the metal charge. The beneficial effect of the utility model is that, while using the carbonaceous material as the heat exchange material, the metallurgical effect of the carbonaceous material on the molten iron can be brought into play, the chemical heat loss can be reduced, the heat supply of the heat exchange bed can be enhanced, the carbonization of the molten iron can be increased, and the alloy can be reduced. Burning loss, improving the quality of molten iron, simplifying the structure of the natural gas cupola combustion chamber, and improving the smelting performance of the natural gas cupola; the proportion of carbonaceous heat exchange materials to heat exchange materials can be adjusted according to the metallurgical requirements of the furnace charge and the processing temperature requirements of the molten iron. Realize rational and comprehensive utilization of resources.

Description

A carbonaceous heat exchange bed of a grate type natural gas cupola

technical field

The invention relates to a grate type natural gas cupola carbonaceous heat exchange bed, which belongs to the field of mineral processing production equipment. the

Background technique

At present, in the known grate type natural gas cupola, the heat exchange bed uses heat-resistant ceramic balls as the heat exchange medium to heat the molten iron. Because the material of the ceramic ball is metal oxide, it has no metallurgical effect on the molten iron. In the oxidizing atmosphere of the cupola furnace, the metal elements and carbon in the molten iron are oxidized and burned by oxygen, carbon dioxide and some other oxides. At the same time, the carbon Elements are also oxidized when reducing metal oxides in molten iron. Therefore, the carbon content of molten iron drops seriously, and additional technical measures need to be taken to increase the carbon content of molten iron. On the other hand, the ceramic ball itself cannot generate heat, and can only transfer the heat of the furnace gas to the molten iron. Since the heat transfer efficiency between the furnace gas and the ceramic ball is lower than that of the ceramic ball to the molten iron, the furnace gas usually The heat utilization rate is low, and the temperature rise of molten iron passing through the heat exchange bed cannot meet the process requirements, and it needs to be further overheated in the combustion chamber. difficulty. the

Contents of the invention

In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a carbonaceous heat exchange bed for a grate-type natural gas cupola, which solves the deficiencies that the existing technology cannot complete the carburization of molten iron and the metallurgical process, It can not only complete the carburization of molten iron, reduce the burning loss of alloy elements in molten iron, but also meet the smelting requirements of different grades of molten iron. the

In order to solve the above-mentioned technical problems, the present invention is realized by the following technical solutions: a grate-type natural gas cupola carbonaceous heat exchange bed, including a furnace body, a water-cooled grate is arranged at the lower part of the furnace body, and the water-cooled grate above the water-cooled grate A heat exchange bed is provided; a number of air outlets are opened on the upper furnace wall of the water-cooled grate; a metal charge is arranged above the heat exchange bed, and several layers of coke are arranged in the metal charge. the

Optimally, the above-mentioned grate-type natural gas cupola carbonaceous heat exchange bed has an air supply outlet connected to an air supply pipe, and the air supply pipe is connected to a bellows. the

Optimized, the above-mentioned grate-type natural gas cupola carbonaceous heat exchange bed, the vertical distance between the air supply port and the water-cooled grate is 400mm, the air supply port is arranged in a ring on the furnace body, the distance between the air supply ports is 300mm, and the air supply port ratio is 1.5%. the

For the optimized carbonaceous heat exchange bed of the grate-type natural gas cupola, the height of the heat exchange bed is 500-600mm, and the block degree of the carbonaceous block is 60-100mm.

Optimally, the above-mentioned grate-type natural gas cupola carbonaceous heat exchange bed is provided with an air valve on the air supply pipe. the

Optimally, the above-mentioned grate-type natural gas cupola carbonaceous heat exchange bed is provided with a trolley under the furnace body, and the furnace body is connected to the trolley through the combustion chamber lifting mechanism; the trolley is connected to a track on a fixed ground superior. ``

The beneficial effect of the present invention is that, while using carbonaceous materials as heat exchange materials, the metallurgical effect of carbonaceous materials on molten iron can be brought into play, the chemical heat loss can be reduced, the heat supply of the heat exchange bed can be enhanced, the carbonization of molten iron can be increased, and the burning of alloys can be reduced. The purpose of reducing the damage and improving the quality of molten iron, simplifying the combustion chamber structure of natural gas cupola, and improving the smelting performance of natural gas cupola; the proportion of carbonaceous heat exchange materials in heat exchange materials can be adjusted according to the metallurgical requirements of the furnace charge and the processing temperature requirements of molten iron; fully Utilize the outstanding advantages of energy saving and environmental protection of natural gas cupola and the good metallurgical performance of coke cupola to realize rational and comprehensive utilization of resources.

The present invention will be further described below in conjunction with the embodiments and accompanying drawings. the

Description of drawings

Fig. 1 is a structural schematic diagram of the use state of the present invention. ``

Detailed ways

The technical characteristics of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. the

As shown in Figure 1, the present invention is a carbonaceous heat exchange bed of a grate-type natural gas cupola, comprising a furnace body 9, a melting pool 17 is arranged at the inner bottom of the furnace body 9, and a combustion chamber 5 is arranged above the melting pool 17 , the furnace wall of the combustion chamber 5 is provided with a burner 6, the top of the burner 6 is provided with a natural gas distribution pipe 7, the furnace wall at the junction of the melting pool 17 and the combustion chamber 5 is provided with a taphole 4, and its furnace body 9 A water-cooled grate 8 is arranged at the lower part of the inner middle, and a heat exchange bed 12 is arranged above the water-cooled grate 8. The heat exchange bed 12 is a mixture of carbonaceous blocks and high-temperature resistant ceramic balls; the upper furnace wall of the water-cooled grate 8 A plurality of air supply ports 10 are provided on the top, and air is supplied to the middle and upper parts in the carbon bed to support the carbon monoxide and other combustible components in the combustion furnace gas. The air supply port 10 is connected with an air supply pipe 15, and the air supply pipe 15 is connected with the air box 11 and the blower; above the heat exchange bed 12, a metal charge 13 is arranged, and several layers of coke 14 are arranged in the metal charge 13. The vertical distance between the air supply port 10 and the water-cooled grate 8 is 400mm, the air supply port 10 is arranged circularly on the furnace body 9, the distance between the air supply port 10 is 300mm, and the air port ratio of the air supply port 10 is 1.5%. The carbonaceous blocks account for 50%--100% of the heat exchange bed 12 . The air supply pipe 15 is provided with an air valve 16, and the air supply volume in the carbon bed can be adjusted. A trolley 2 is arranged below the furnace body 9, and the furnace body 9 is connected with the trolley 2 through the combustion chamber lifting mechanism 3; the trolley 2 is connected and arranged on the track 1 on the fixed ground. The height of the heat exchange bed 12 is 500-600mm, and the block degree of the carbonaceous block is 60-100mm. The grate-type natural gas cupola heat exchange bed of the present invention is provided with an air supply port at an appropriate position of the heat exchange bed, and the main purpose is to support the combustible gas such as carbon monoxide generated by the reaction of the furnace gas of the combustion chamber and the carbonaceous material of the heat exchange bed when it passes through the heat exchange bed. , reduce chemical heat loss, and enhance the heat supply of the heat exchange bed; the proportion of carbonaceous heat exchange materials in heat exchange materials can be adjusted according to the metallurgical requirements of the charge and the temperature requirements of molten iron treatment. Air volume. If operating according to the technical scheme of the embodiment, the amount of materials input into each batch of production is: 200kg/batch of metal charge, 8kg/batch of layer coke, 2kg/batch of limestone, and 8-10m ³ /min of air volume.

The grate type natural gas cupola carbonaceous heat exchange bed of the present invention can not only complete the carburization of molten iron, reduce the burning loss of alloy elements in molten iron, but also meet the smelting requirements of different grades of molten iron; The role of bottom coke, compared with ordinary cupolas, consumes 40kg of carbon and 60 M3 of natural gas per ton of molten iron. Under the condition of not taking other metallurgical measures, the temperature of the molten iron reaches 1520°C and stabilizes at 1450°C to 1500°C; The content of iron oxide in the slag is less than 5%. Depending on the amount of carbon and impurities in the furnace charge, the carbon increase can reach 1.2%, the Si burning loss rate is 10% to 15%, and the Mn burning loss rate is 15% to 20%, which is close to ordinary cupola. Good level of furnace. the

The basic principles and main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned implementation regulations. What is described in the above-mentioned implementation regulations and the description is only used to illustrate the principles of the present invention. Without departing from the principles and scope of the present invention, the present invention also Various changes and modifications are possible, which fall within the scope of the claimed invention. the

The protection scope of the present invention is defined by the appended claims and other equivalents. the

Claims (6)

1. A grate type natural gas cupola carbonaceous heat exchange bed, comprising a furnace body, a water-cooled grate is arranged at the lower part of the furnace body, and it is characterized in that: a heat exchange bed is arranged above the water-cooled furnace grate; The upper furnace wall of the water-cooled grate is provided with a plurality of air supply ports; the metal charge is arranged above the heat exchange bed, and several layers of coke are arranged in the metal charge. 2. The carbonaceous heat exchange bed of a grate-type natural gas cupola according to claim 1, characterized in that: said air supply port is connected with an air supply pipe, and the air supply pipe is connected with a bellows. 3. The grate-type natural gas cupola carbonaceous heat exchange bed according to claim 2, characterized in that: the vertical distance between the air supply port and the water-cooled grate is 400mm, the air supply port is annularly arranged on the furnace body, and the air supply port The spacing is 300mm, and the air outlet ratio of the air supply port is 1.5%. 4. The carbonaceous heat exchange bed of grate-type natural gas cupola according to claim 3, characterized in that: the height of the heat exchange bed is 500-600 mm, and the block size of the carbonaceous block is 60-100 mm. 5. The carbonaceous heat exchange bed of a grate-type natural gas cupola according to claim 4, characterized in that: said air supply pipe is provided with a damper. 6. The grate type natural gas cupola carbonaceous heat exchange bed according to claim 5, characterized in that: a trolley is arranged below the furnace body, and the furnace body is connected with the trolley through a combustion chamber lifting mechanism; The trolley is connected and arranged on the track on the fixed ground.

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