Efficient reduction furnace capable of saving flow of reducing gas

Abstract

The utility model relates to an efficient reduction furnace capable of saving reducing gas flow, which comprises a heating area, a high-temperature area and a cooling area which are respectively provided with a heating channel, a high-temperature channel and a cooling channel and are sequentially arranged, and the height of the high-temperature channel is smaller than that of the heating channel and that of the cooling channel. According to the preferable scheme, during use, the height of the high-temperature channel is reduced, namely, the sectional area of the high-temperature channel is reduced, the distance between the reducing gas and the pressed powder is shortened, and the reducing gas fully reacts, so that the utilization rate of the reducing gas is increased, and the waste of the reducing gas is reduced; the flow rate of the gas in the high-temperature channel is increased, so that sufficient reducing gas is ensured, and the reaction efficiency is also improved.

Description

Technical Field

[0001] The utility model relates to the field of reduction, in particular to the technical field of saving reducing gas, and specifically refers to a high-efficiency reduction furnace capable of saving the flow of reducing gas. Background Art

[0002] In the field of powder metallurgy, after the powder is made into a powder cake, a reduction furnace is needed to reduce the powder cake to obtain iron. The reduction furnace includes a furnace shell and a conveyor belt for transporting the powder cake in the furnace shell. An air flow channel is formed between the powder cake and the furnace shell. The furnace cavity can be divided into a heating zone, a high-temperature zone, and a cooling zone according to the change of the reaction temperature. The high-temperature zone is the main reaction zone. The corresponding air flow channels include a heating channel located in the heating zone, a high-temperature channel located in the high-temperature zone, and a cooling channel located in the cooling zone. The powder cake is reduced by introducing reducing gas into the furnace cavity. The current reduction furnace has the same size of the entire air flow channel. This results in the addition of sufficient reducing gas in the high-temperature zone to ensure the reduction of the powder cake. However, due to the high height of the high-temperature channel, some of the hydrogen above the powder cake leaves the high-temperature zone before reacting, which makes the reducing gas reaction insufficient, resulting in a large amount of waste of reducing gas. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a high-efficiency reduction furnace which saves the flow of reducing gas and reduces the waste of reducing gas.

[0004] The utility model is realized through the following technical scheme: a high-efficiency reduction furnace that saves the flow of reducing gas, including a heating channel, a high-temperature channel, and a cooling channel, which are respectively provided with a heating zone, a high-temperature zone, and a cooling zone arranged in sequence, and the height of the high-temperature channel is smaller than the heights of the heating channel and the cooling channel.

[0005] When the new type is in use, the height of the high-temperature channel is reduced, thereby reducing the cross-sectional area of ​​the high-temperature channel, shortening the distance between the reducing gas and the powder cake, allowing the reducing gas to fully react, thereby increasing the utilization rate of the reducing gas and reducing the waste of the reducing gas. At the same time, since the flow rate of the gas channel remains unchanged, the flow rate of the gas in the high-temperature channel is increased, ensuring the sufficiency of the reducing gas and also facilitating the improvement of the reaction efficiency.

[0006] Preferably, the cross-sectional area of ​​the high-temperature channel is 0.15-0.18 times the cross-sectional area of ​​the heating channel or the cooling channel.

[0007] This preferred solution increases the utilization rate of reducing gas and saves the use of reducing gas by limiting the cross-sectional area.

[0008] Preferably, the high-temperature shell of the high-temperature zone is sealed with the heating shell of the heating zone and the cooling shell of the cooling zone respectively. A block is also provided in the high-temperature shell, and the high-temperature channel is formed between the bottom surface of the block and the conveyor belt for conveying the powder cake.

[0009] This preferred solution reduces the height of the high-temperature channel by setting a block.

[0010] As a preference, the two sides of the block arranged along the direction of air flow are both inclined surfaces for guiding the air flow. This preferred solution provides a guiding effect on the reducing gas by setting the inclined surfaces.

[0011] Preferably, the block includes a plurality of baffles connected in sequence along the airflow direction. This preferred solution facilitates adjustment of the length of the block through the arrangement of the baffles, thereby adapting to high temperature zones of different lengths.

[0012] Preferably, the high temperature shell of the high temperature zone includes a top plate, a side plate connected to the top plate and sealed to the heating shell of the heating zone and the cooling shell of the cooling zone respectively, and the high temperature channel is formed between the top plate and the powder cake.

[0013] This preferred solution reduces the height of the high-temperature channel by arranging the top plate and the side plates.

[0014] Preferably, a support plate located directly above the side plate is further connected between the heating shell and the cooling shell, and the support plate is connected to the top plate via tie bars, and a plurality of tie bars are arranged along the direction of airflow.

[0015] This preferred solution improves the strength of the top plate and prevents the top plate from collapsing by providing tie bars and support plates.

[0016] The beneficial effects of the present invention are as follows: the cross-sectional area of ​​the high-temperature channel is reduced, the distance between the reducing gas and the powder cake is shortened, the reducing gas is fully reacted, thereby increasing the utilization rate of the reducing gas and reducing the waste of the reducing gas; at the same time, since the flow rate of the gas channel remains unchanged, the flow rate of the gas in the high-temperature channel is increased, ensuring the sufficiency of the reducing gas and also facilitating the improvement of the reaction efficiency; by setting the block, the height of the high-temperature channel is reduced; by setting the baffle, the length of the block can be easily adjusted, thereby adapting to high-temperature zones of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model in Example 1;

[0018] Figure 2 It is a temperature curve diagram of the structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the existing technology structure;

[0020] Figure 4 A comparison diagram of the cross-sectional area of ​​the high-temperature channel in the prior art and this solution;

[0021] As shown in the figure:

[0022] 1. Pressed powder, 2. Conveyor belt, 3. Heating zone, 4. High temperature zone, 5. Stopper, 6. Cooling zone. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0024] Refer to the attached Figure 2-3 The utility model is a high-efficiency reduction furnace that saves the flow of reducing gas, including a heating channel, a high-temperature channel, and a cooling channel, which are respectively provided with a heating zone, a high-temperature zone, and a cooling zone, and the heating channel, the high-temperature channel, and the cooling channel are connected in sequence to form an airflow channel. A conveyor belt is also provided in the reduction furnace to drive the powder cake to pass through the heating zone, the high-temperature zone, and the cooling zone in sequence. The powder cake is conveyed on the conveyor belt, and the powder cake has a certain thickness. The heating channel, the high-temperature channel, and the cooling channel are located above the powder cake.

[0025] The reaction temperatures in the heating zone, high-temperature zone, and cooling zone are different. The high-temperature zone is the main reaction zone. The cross-sections of the heating channel and the cooling channel are the same. The cross-sectional area of ​​the high-temperature channel is smaller than that of the heating channel and is 0.15-0.18 times that of the heating channel. The cross-sectional area of ​​the high-temperature channel is changed by changing the height of the high-temperature channel.

[0026] By introducing reducing gas into the furnace chamber, the powder cake is reduced, and the size of the exhaust gas combustion flame at the tail of the furnace chamber can fully react and the utilization rate of the reducing gas is high or low.

[0027] In the existing scheme, the cross-sectional area of ​​the high-temperature channel is 0.0853m 2 Under the condition that the powder cake is fully reduced, the height of the high-temperature channel is determined by changing the height of the high-temperature channel and monitoring the flow rate of the reducing gas used. The experimental data are shown in the following table:

[0028]

[0029] When the height of the high-temperature channel is between 0.08m and 0.10m, the reducing gas flow rate used is relatively small. Therefore, when the cross-sectional area of ​​the high-temperature channel is 0.15-0.18 times the cross-sectional area of ​​the heating channel, more reducing gas is saved.

[0030] Example 1:

[0031] Refer to the attached Figure 1-3The high-temperature housing in the high-temperature zone is sealedly connected to the heating housing in the heating zone and the cooling housing in the cooling zone. A block is also provided within the high-temperature housing, and the high-temperature channel is formed between the bottom surface of the block and the conveyor belt for conveying the powder. Both sides of the block, arranged along the airflow direction, are inclined surfaces that guide the airflow. The block comprises a plurality of baffles connected in sequence along the airflow direction.

[0032] Example 2:

[0033] The high-temperature shell in the high-temperature zone includes a top plate, a side plate connected to the top plate and sealed with the heating shell in the heating zone and the cooling shell in the cooling zone respectively. The side plate is an upwardly inclined inclined plate. The high-temperature channel is formed between the top plate and the powder cake. A support plate located directly above the side plate is also connected between the heating shell and the cooling shell. The support plate is connected to the top plate through a tie rod, and several tie rods are arranged along the direction of airflow.

[0034] When the utility model is in use, the height of the high-temperature channel is lowered, thereby reducing the cross-sectional area of ​​the high-temperature channel, shortening the distance between the reducing gas and the powder cake, allowing the reducing gas to fully react, and avoiding the reducing gas from directly passing through the high-temperature channel from above the powder cake, thereby increasing the utilization rate of the reducing gas and reducing the waste of the reducing gas. At the same time, since the flow rate of the gas channel remains unchanged, the flow rate of the gas in the high-temperature channel is increased, ensuring the sufficiency of the reducing gas, and also facilitating the improvement of the reaction efficiency.

[0035] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-efficiency reduction furnace for saving reducing gas flow, comprising a heating channel, a high-temperature channel, and a cooling channel, and a heating zone, a high-temperature zone, and a cooling zone arranged in sequence, characterized in that: The height of the high-temperature channel is smaller than that of the heating channel and the cooling channel; The cross-sectional area of ​​the high-temperature channel is 0.15-0.18 times the cross-sectional area of ​​the heating channel or the cooling channel; The high temperature shell of the high temperature zone is sealed with the heating shell of the heating zone and the cooling shell of the cooling zone respectively. A block is also provided in the high temperature shell, and the high temperature channel is formed between the bottom surface of the block and the conveyor belt for conveying powder cakes.

2. The high-efficiency reduction furnace for saving reducing gas flow according to claim 1, characterized in that: Both side surfaces of the block arranged along the airflow direction are inclined surfaces for guiding the airflow.

3. The high-efficiency reduction furnace for saving reducing gas flow according to claim 2, characterized in that: The baffle comprises a plurality of baffles connected in sequence along the flow direction of the airflow.

4. The high-efficiency reduction furnace for saving reducing gas flow according to claim 1, characterized in that: The high temperature shell of the high temperature zone includes a top plate, a side plate connected to the top plate and sealed to the heating shell of the heating zone and the cooling shell of the cooling zone respectively. The high temperature channel is formed between the top plate and the powder cake.

5. The high-efficiency reduction furnace for saving reducing gas flow according to claim 4, characterized in that: A support plate located directly above the side plate is further connected between the heating shell and the cooling shell. The support plate is connected to the top plate via tie bars, and a number of tie bars are arranged along the direction of airflow.

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