Device for directly recycling semicoke

Abstract

A device for directly recycling semicoke comprises a smelting reduction furnace (1), a gravity dust collector (13), a cyclone dust collector (15) and a semicoke bin (3), the front end of the gravity dust collector (13) is connected with the smelting reduction furnace (1) through an evaporative cooling flue (12), and the rear end of the gravity dust collector (13) is connected with the cyclone dust collector (15) through a connecting flue (14). The gravity dust collector (13) and the cyclone dust collector (15) are connected with the semi-coke bin (3) through an articulated chute II (7), and the semi-coke bin (3) is connected with an opening in the side face of the top of the smelting reduction furnace (1) through an articulated chute I (2). According to the device, semicoke is directly recycled and does not need to be added into pulverized coal; foam slag cannot be generated; design is simple, the technological process is simplified, and safety and reliability are achieved.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of steel smelting, and more specifically, to a device for direct recycling of semi-coke. Background Art

[0002] The smelting reduction furnace will produce a large amount of high-temperature flue gas during the oxidation-reduction process. This high-temperature flue gas needs to be filtered and cleaned by a dust removal device to obtain clean coal gas. The dust removal product when the high-temperature flue gas passes through the gravity dust collector and the cyclone dust collector is semi-coke. The carbon content of semi-coke is as high as 45-90%, so it is generally added to coal powder after recovery, and then sprayed into the molten iron of the smelting reduction furnace for carburizing and reducing iron ore. However, in the actual process, the proportion of semi-coke added to coal powder generally does not exceed 10%, otherwise it may have an adverse effect on production, such as the generation of foamy slag. Even if the addition amount is very low, a large amount of foamy slag often appears. The main reason is that there is more ash in the semi-coke, which is wrapped outside the fixed carbon of the semi-coke, affecting the reduction rate and carburizing rate of the fixed carbon. Secondly, the carbon content of semi-coke in different batches is uneven, and semi-coke with low carbon content is also easy to cause foamy slag.

[0003] If the semi-coke is added to the surface of the slag and does not directly participate in the reduction of the iron oxides in the molten iron, but reduces the iron oxides indirectly through the slag removal oxygen, the above problems will not occur. Therefore, a device for directly recycling semi-coke is proposed. Utility Model Content

[0004] The utility model aims to provide a device for directly recycling semi-coke, so as to solve the problem of poor effect of adding semi-coke at present.

[0005] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0006] A device for directly recycling semi-coke comprises a smelting reduction furnace (1), a gravity dust collector (13), a cyclone dust collector (15) and a semi-coke bin (3); the front end of the gravity dust collector (13) is connected to the smelting reduction furnace (1) via a vaporization cooling flue (12), and the rear end is connected to the cyclone dust collector (15) via a connecting flue (14); the gravity dust collector (13) and the cyclone dust collector (15) are connected to the semi-coke bin (3) via a chute II (7); and the semi-coke bin (3) is connected to a top side opening of the smelting reduction furnace (1) via a chute I (2).

[0007] Furthermore, it also includes a bucket elevator (8) and a chain conveyor (9), the lower ends of the gravity dust collector (13) and the cyclone dust collector (15) are connected to one end of the chain conveyor (9), the other end of the chain conveyor (9) is connected to the bucket elevator (8), and the bucket elevator (8) is connected to the semi-coke bin (3) through a chute II (7).

[0008] Furthermore, a first pneumatic gate valve (101) and a first pneumatic double-layer flap valve (111) are installed in sequence at the connection between the chain conveyor (9) and the gravity dust collector (13), and a second pneumatic gate valve (102) and a second pneumatic double-layer flap valve (112) are installed in sequence at the connection between the chain conveyor (9) and the cyclone dust collector (15).

[0009] Furthermore, a weighing device (5) and a material level meter (6) are installed on the semi-coke bin (3).

[0010] Furthermore, an electric gate valve and a regulating valve (4) are installed at the semi-coke bin (3) and the slide pipe I (2).

[0011] Furthermore, the slide pipe I (2) is provided with pneumatic blowing and vibration clearing devices.

[0012] The advantages and effects of the utility model are as follows: the semi-coke produced after the fuel reacts in the smelting reduction furnace (1) passes through the vaporization cooling flue (12), gravity dust removal (13), and cyclone dust removal (15) for deposition in sequence, and then enters the chain conveyor (9) through the pneumatic gate valve (11) and the pneumatic double-layer flap valve (12) to be transported to the receiving end of the bucket elevator (8), and then enters the semi-coke bin (3) through the slide pipe 2 (7) for storage. When the starting material level meter (6) issues a specified material level alarm or the weighing device (5) displays a specified weight, the interlock is triggered to automatically open the electric gate valve and the regulating valve (4) and spray into the smelting reduction furnace (1) through the slide pipe 1 (2) to participate in a series of reactions. Compared with the original process, it has the following advantages: (1) Reduce manpower and improve the utilization efficiency of high-temperature semi-coke: because the pneumatic gate valve 10 and the pneumatic double-layer flap valve 11 are set, the original manual ash bin and water sprinkling dust suppression and cooling device are cancelled, and the online transportation of semi-coke and the independent recycling of high-temperature semi-coke are realized; (2) It will not cause foam slag; due to the uniqueness of the injection position of chute I chute 1 (2), the surface tension of the slag can be quickly increased, and the generation of foam slag can be effectively prevented (3) The addition amount is increased to 20-30%; due to the independent operation of the entire system, the continuous injection of self-produced high-temperature semi-coke is realized, which greatly reduces the fuel consumption per ton of iron (4) The design is simple, the process flow is simplified, and it is safe and reliable. Due to the presence of the continuous conveyor (9) and the bucket elevator (8), the sensible heat loss is reduced, and the transportation and application of high-temperature semi-coke are realized. At the same time, due to the simple structure of the equipment, the failure rate is also reduced, and the operation cycle of the entire system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a device for directly recycling semi-coke in this invention.

[0014] Among them: 1. Melting reduction furnace 2. Chute I 3. Semi-coke bin 4. Electric gate valve and regulating valve 5. Weighing device 6. Level meter 7. Chute II 8. Bucket elevator 9. Chain conveyor 101. First pneumatic gate valve 102. Second pneumatic gate valve 111. First pneumatic double-layer flap valve 112. Second pneumatic double-layer flap valve 12. Vaporization cooling flue 13. Gravity dust collector 14. Connecting flue 15. Cyclone dust collector DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model is clearly and completely described below. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of 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] The technical solution of the utility model is further explained and illustrated below in conjunction with specific embodiments.

[0017] A device for directly recycling semi-coke comprises a smelting reduction furnace 1, a gravity dust collector 13, a cyclone dust collector 15, a bucket elevator 9, a chain conveyor 10 and a semi-coke bin 3. The front end of the gravity dust collector is connected to the smelting reduction furnace 1 through a vaporization cooling flue 12, and the rear end is connected to the cyclone dust collector 15 through a connecting flue 14. The lower ends of the gravity dust collector and the cyclone dust collector are both connected to one end of the chain conveyor 9, and the other end of the chain conveyor is connected to the bucket elevator 8. The bucket elevator is connected to the semi-coke bin 3 through a chute II 7, and the semi-coke bin is connected to the top side opening of the smelting reduction furnace through a chute I.

[0018] Furthermore, the first pneumatic gate valve 101, the second pneumatic gate valve 102, the first pneumatic double-layer flap valve 111, and the second pneumatic double-layer flap valve 112 are installed in sequence from top to bottom at the connection between the chain conveyor and the gravity dust collector and the cyclone dust collector. The former has a cutting effect, and the latter has a cutting and throttling effect.

[0019] Furthermore, a weighing device 5 and a material level meter 6 are installed on the semi-coke bin. When the semi-coke bin exceeds 95% or is less than 20% semi-coke, a high material level alarm or a low material level alarm will be triggered to remind the operator to stop feeding or feed in time. The weighing device is used to weigh the semi-coke bin and the semi-coke entering the smelting reduction furnace.

[0020] Furthermore, the semi-coke bin and the chute 12 are equipped with an electric gate valve and a regulating valve 4 for cutting off and regulating the amount of semi-coke entering and leaving the smelting reduction furnace to prevent leakage of bituminous coal in the smelting reduction furnace.

[0021] Furthermore, the tonnage of the semi-coke bin is 80-120t, one for use and one for backup. When one of the semi-coke bins fails, the backup bin can be activated.

[0022] Furthermore, when the semi-coke transportation is started, the bucket elevator is started first, the pneumatic double-layer flap valve is opened with a delay, the pneumatic plug valve is opened with a delay, the pneumatic double-layer flap valve maintains a cycle operation, and the start-up is completed.

[0023] Furthermore, when the semi-coke transportation stops, the pneumatic gate valve is closed with a delay, the pneumatic double-layer flap valve is closed with a delay, and the bucket elevator is closed with a delay, and all are closed after one cycle.

[0024] Furthermore, the ratio of semi-coke to coal powder added is 1:4 to 3:7.

[0025] Example 1

[0026] A device for directly recycling semi-coke comprises a smelting reduction furnace 1, a gravity dust collector 13, a cyclone dust collector 15, a bucket elevator 8, a chain conveyor 9 and a semi-coke bin 3, wherein the tonnage of the semi-coke bin is 80t.

[0027] The high-temperature flue gas generated by the smelting reduction furnace 1 enters the gravity dust collector 13 through the vaporization cooling flue 12, and enters the cyclone dust collector 15 through the connecting flue 14. The high-temperature flue gas is sequentially dedusted in the gravity dust collector and the cyclone dust collector to obtain gravity semi-coke and cyclone semi-coke, respectively. After the ash storage boxes of the gravity dust collector and the cyclone dust collector are filled, start the bucket elevator 8, delay opening the first pneumatic double-layer flap valve 111 and the second double-layer flap valve 112, delay opening the first pneumatic gate valve 101 and the second pneumatic gate valve 102, the first double-layer flap valve 111 and the second double-layer flap valve 112 keep running in a cycle, and the start-up is completed; the semi-coke enters the semi-coke bin 3 through the chain conveyor 9, the bucket elevator 8 and the slide pipe II 7 in turn. When the semi-coke bin material level reaches 95%, the material level meter alarms, and when the semi-coke transportation stops, the pneumatic gate valve is delayed to close, the pneumatic double-layer flap valve is delayed to close, and the bucket elevator is delayed to close. After one cycle, all are closed. Open the electric gate valve and the regulating valve 4, and add 20% semi-coke from the semi-coke bin to the molten reduction furnace through the slide pipe I 2.

[0028] The smelting reduction furnace smelts smoothly and no foamy slag is seen when slag is discharged.

[0029] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be based on the scope defined in the attached claims.

Claims

1. A device for direct recycling of semi-coke, characterized in that: The invention comprises a smelting reduction furnace (1), a gravity dust collector (13), a cyclone dust collector (15) and a semi-coke bin (3); the front end of the gravity dust collector (13) is connected to the smelting reduction furnace (1) via a vaporization cooling flue (12), and the rear end is connected to the cyclone dust collector (15) via a connecting flue (14); the gravity dust collector (13) and the cyclone dust collector (15) are connected to the semi-coke bin (3) via a chute II (7); and the semi-coke bin (3) is connected to the top side opening of the smelting reduction furnace (1) via a chute I (2).

2. The device for direct recycling of semi-coke according to claim 1, characterized in that: It also includes a bucket elevator (8) and a chain conveyor (9). The lower ends of a gravity dust collector (13) and a cyclone dust collector (15) are connected to one end of the chain conveyor (9). The other end of the chain conveyor (9) is connected to the bucket elevator (8). The bucket elevator (8) is connected to the semi-coke bin (3) via a chute II (7).

3. The device for direct recycling of semi-coke according to claim 2, characterized in that: A first pneumatic gate valve (101) and a first pneumatic double-layer flap valve (111) are installed in sequence at the connection between the chain conveyor (9) and the gravity dust collector (13); a second pneumatic gate valve (102) and a second pneumatic double-layer flap valve (112) are installed in sequence at the connection between the chain conveyor (9) and the cyclone dust collector (15).

4. The device for direct recycling of semi-coke according to any one of claims 1 to 3, characterized in that: A weighing device (5) and a material level meter (6) are installed on the semi-coke bin (3).

5. The device for direct recycling of semi-coke according to claim 4, characterized in that: The semi-coke bin (3) and the slide pipe I (2) are equipped with electric gate valves and regulating valves (4).

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