Process for improving the permeability of a sintering bed

Abstract

The application provides a process for improving the air permeability of a sintering material layer, comprising the following steps: (1) positioning a puncher at a sintering material distribution position at the head of a sintering trolley, and wrapping the puncher in the material layer when the sintering material is formed into a layer, and then the puncher and the material layer run forward together with the sintering trolley; (2) repeating step (1) two or more times, so that a plurality of punchers are arranged in order and at intervals on the material layer along the running direction of the sintering trolley, each puncher comprising a rod body part located in the material layer and a head part connected to the top end of the rod body part, and the head part is located above the material layer; (3) igniting and sintering the material layer when the material layer is conveyed by the sintering trolley through an ignition furnace; and (4) after the material layer is sintered, each puncher is extracted from the material layer one by one, and a sintered material layer with air holes is obtained. By pre-embedding the puncher when the sintering material is distributed, and extracting the puncher after sintering, non-extrusion air holes are left on the material layer, and the loose performance of the material layer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of iron ore processing, in particular to a process for improving the permeability of sintering material layer. BACKGROUND

[0002] Thick-layer low-temperature sintering technology is an advanced sintering technology widely used in recent years. Based on the calcium ferrite solidification theory and the automatic heat storage effect of the sintering process, thick-layer sintering can reduce solid fuel consumption, reduce carbon oxide emissions, reduce the thickness of the combustion zone, reduce the ferrous content of sinter, promote the formation of calcium ferrite, improve the mineral structure of sinter, and improve the strength and yield of sintered products. However, when the sintering material layer reaches a certain thickness, it will cause poor permeability of the material layer, reduced sintering speed, and poor physical and chemical properties of the lower sinter due to over-melting. Therefore, how to further increase the layer height and improve the quality of sinter production is of great significance to the development of sintering.

[0003] However, the existing technologies such as the device for improving sintering permeability and its adjustment method disclosed in the Chinese patent with publication number CN 113446858 A, the device for improving the permeability of the material surface of the sintering machine disclosed in the Chinese patent with authorization announcement number CN 208505022 U, and the trolley material surface perforating device for improving sintering permeability disclosed in the Chinese patent with authorization announcement number CN 210773432 U, all use the material surface insertion technology of "perforating on the flat material surface" to form pores in the material layer, thereby improving the permeability of the sintering material layer. However, the existing material surface insertion technology has the following defects: (1) the perforator needs to be inserted into the material layer, and the space occupied by the perforator needs to be squeezed out, which causes the material layer to be compacted and the permeability to be reduced before the pores are formed in the material layer; (2) it is difficult to insert into a deep position, and the sintering process of the sintering material layer starts from the surface, air is introduced into the deep part of the material layer from the surface of the material layer, and a large amount of additional waste gas is generated, thus causing insufficient permeability and slow reaction in the deep part of the material layer. SUMMARY

[0004] The present application provides a process for improving the permeability of sintering material layer, which can solve the problems existing in the existing sintering material surface insertion technology.

[0005] A process for improving the permeability of sintering material layer, comprising the following steps:

[0006] (1) positioning a perforator at the sintering material distribution position of the head of the sintering trolley, and wrapping the perforator with the material layer when the sintering material is formed into a material layer, and then the perforator and the material layer run forward together with the sintering trolley;

[0007] (2) Repeat the above step (1) two or more times, so that several said punchers are arranged in order and at intervals on the material layer along the running direction of the sintering trolley, each said puncher includes a rod body part located in the material layer and a head part connected to the top end of the rod body part, and the head part is located above the material layer;

[0008] (3) The material layer is ignited and sintered when it is transported by the sintering trolley through the ignition furnace;

[0009] (4) After the material layer is sintered, each said puncher is extracted from the material layer one by one, and a sintered material layer with air holes is obtained.

[0010] The process for improving the air permeability of the sintered material layer of the present application realizes pre-embedding of the puncher by wrapping the material layer around the puncher when sintering the material, and extracts the puncher after sintering. Each said puncher will leave a non-extrusion air hole in the material layer when it is extracted, which increases the loose performance of the material layer. Compared with the existing material surface hole insertion technology, the advantages of the present application are: (1) The puncher of the present application is pre-embedded when sintering the material, which does not have extrusion force on the material layer and does not change the air permeability of the material layer before forming the pore; (2) The puncher of the present application is pre-embedded in the material layer when sintering the material, which does not have the problem of insertion difficulty, and the pre-embedding depth of the puncher can be freely controlled according to the needs, and the bottom end of the air hole can easily reach the deepest part of the sintered material layer, which is consistent with the sintering reaction mechanism that "the sintering process of the sintered material starts from the surface, the air is inhaled from the surface of the material layer to the deep part of the material layer and burns at the same time, and a large amount of additional waste gas is generated", which is more conducive to improving the air permeability and effectively improving the sintering effect of the sintered material layer; (3) The puncher is extracted after sintering, which avoids the problem that the air hole formed by extracting the puncher is filled with the material behind it and cannot play the role of loosening the material layer.

[0011] Further, the sintering time of the material layer in the above step (3) is ≥0.2s, so as to prevent the air hole formed by extracting the puncher from being refilled with the material behind it.

[0012] Further, the rod body part of the puncher is in the form of a straight rod.

[0013] Further, the head part of the puncher is in the form of a ring structure, which protrudes above the surface of the material layer when the material is sintered, so that the mechanical hand or other puncher extraction device can be inserted into the inner hole of the ring structure to better fix the head part, which is conducive to smoothly extracting the puncher upward. At the same time, the head part of the puncher can also be a limiting structure protruding from both sides of the rod body part, and at this time, the mechanical hand or other puncher extraction device can also smoothly extract the puncher upward by clamping the position of the rod body part close to the head part.

[0014] Further, an annular baffle is movably sleeved on the rod body of the puncher, and the annular baffle is located above the material layer and remains stationary when the puncher is pulled out. When the puncher is pulled out, the annular baffle can prevent the material from sticking to the puncher and being taken out. The height of the annular baffle from the surface of the material layer can be adjusted according to production needs. Preferably, the annular baffle is pressed against the surface of the material layer.

[0015] The puncher is made of ordinary steel or cast iron. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the use state of the puncher of the present application, wherein the annular baffle is an axial sectional view structure diagram, and the direction indicated by the arrow is the running direction of the sintering trolley;

[0017] Figure 2 is a top view structure diagram of the puncher of the present application;

[0018] Figure 3 is an assembly work structure diagram of the puncher pulling-out device and the puncher of the present application. DETAILED DESCRIPTION

[0019] The specific embodiment of the process for improving the permeability of the sintered material layer of the present application will be described below.

[0020] In combination Figure 1 and Figure 3 A process for improving the permeability of the sintered material layer, comprising the following steps:

[0021] (1) A puncher 20 is positioned at the sintering material distribution position of the head of the sintering trolley 10, and the material layer 30 formed by sintering material distribution wraps the puncher 20, and then the puncher 20 and the material layer 30 run forward together with the sintering trolley 10;

[0022] (2) The above step (1) is repeated more than twice, so that a plurality of punchers 20 are arranged in order and at intervals along the running direction of the sintering trolley 10 on the material layer 30, each puncher 20 comprises a rod body 21 located in the material layer 30 and a head 22 connected and arranged at the top end of the rod body 21, and the head 22 is located above the material layer 30;

[0023] (3) The material layer 30 is ignited and sintered when it is conveyed by the sintering trolley 10 through the ignition furnace;

[0024] (4) After the material layer 30 is sintered, each puncher 20 is pulled out from the material layer 30 one by one, and a sintered material layer with pores is obtained.

[0025] The process for improving the permeability of the sintering material layer of the present application realizes the pre-embedding of the puncher by wrapping the material layer 30 around the puncher 20 during the sintering material distribution, and extracting the puncher 20 after sintering, and each time the puncher 20 is extracted from the material layer 30, it will leave a non-extrusion pore on the material layer 30, thereby increasing the loose performance of the material layer.

[0026] The puncher of the present patent can be clamped and fixed by a mechanical arm or the like clamping and fixing device (conventional structure, not shown) arranged above the sintering material distribution position of the sintering trolley 10, and the puncher 20 is positioned at the sintering material distribution position of the sintering trolley 10 by clamping a certain position (which can be the head 22 of the puncher 20 or the position near the head 22 of the rod body 21) of the puncher 20 by the clamping and fixing device, and the clamping and fixing device is released after the puncher 20 is embedded in the material layer 30, so that the puncher 20 runs with the trolley together with the material layer.

[0027] Further, the sintering time of the material layer 30 in the above step (3) is greater than or equal to 0.2s, so that the air hole formed by extracting the puncher 20 will not be refilled by the following material.

[0028] The shape of the puncher 20 is designed to facilitate extraction, so, as shown in Figure 1 , the rod body 21 of the puncher 20 is in the form of a straight rod.

[0029] Further, as shown in Figure 1 , the head 22 of the puncher 20 is in the form of a ring structure, and the head 22 of the puncher 20 is exposed to the surface of the material layer 30 during material distribution, so that the mechanical arm or the like puncher extraction device (conventional structure, not shown) can be inserted into the inner hole of the ring structure to better fix the head 22, thereby facilitating the smooth extraction of the puncher 20 upward. At the same time, as shown in Figure 3 , the head 22 of the puncher 20 can also be a limiting structure protruding from both sides of the rod body 21, at this time, the rod body 21 near the head 22 can be clamped by the mechanical arm or the like puncher extraction device 100, and the puncher 20 can also be smoothly extracted upward. Of course, the presence of the head 22 has already provided sufficient conditions for the smooth extraction of the puncher 20, and the shape and structure of the head 22 can be adjusted and changed according to the specific type of the puncher extraction device selected, but are not limited to the specific shape and structure in the drawings.

[0030] The puncher 20 is a puncher made of ordinary steel or cast iron material.

[0031] The size and embedding position of the puncher 20 of the present application can be adjusted according to the actual production situation.

[0032] The arrangement shape of the puncher 20 can be adjusted and designed according to different sintering machines.

[0033] The puncher 20 can be arranged in multiple numbers in one row according to needs. Since the sintering raw material is continuously arranged, the next batch of punchers 20 is buried after the previous batch of punchers 20 is moved away by a certain distance. The relative distance between the two batches of punchers 20 can be adjusted and designed according to different sintering machines.

[0034] As shown in Figure 1 , Figure 2 , Figure 3 , the rod body part 21 of the puncher 20 is preferably movably sleeved with an annular baffle 40, which is located above the material layer 30 and remains stationary when the puncher 20 is pulled out. When the puncher 20 is pulled out, the annular baffle 40 can prevent the material from sticking to the puncher 20 and being taken out. The height of the annular baffle 40 from the surface of the material layer 30 can be adjusted according to production needs. Preferably, as shown in Figure 1 , Figure 3 , the annular baffle 40 is pressed against the surface of the material layer 30. Of course, the puncher 30 of the present application can also not be provided with the annular baffle 40.

[0035] Of course, the shape of the rod body part 21 and the shape of the head part 22 of the puncher 20 of the present application can be but not limited to the specific shapes in the drawings; the number of the puncher 20 is also not limited to three in the drawings.

[0036] The present application can also make several simple deductions or substitutions without departing from the concept of the present application, which should be considered as belonging to the protection scope of the present application for ordinary skilled persons in the technical field of the present application.

Claims

1. A process for improving the permeability of a sintering bed, characterized in that, The method comprises the following steps: (1) positioning a puncher at the sintering material distribution position of the head of a sintering trolley, and wrapping the puncher in the material layer when the sintering material is distributed to form the material layer, and then the puncher and the material layer run forward together with the sintering trolley; (2) repeating the above step (1) for two or more times, so that a plurality of punchers are arranged in order and at intervals on the material layer in the running direction of the sintering trolley, each puncher comprising a rod body part located in the material layer and a head connected to the top end of the rod body part, and the head is located above the material layer; (3) sintering the material layer by the sintering trolley when it passes through an ignition furnace; (4) after the material layer is sintered, each puncher is extracted from the material layer one by one to obtain a sintered material layer with air holes.

2. The process for improving the permeability of the green pellet bed according to claim 1, characterized in that: The sintering time of the material layer in step (3) is greater than or equal to 0.2s.

3. The process for improving green bed permeability according to claim 1, characterized in that: The rod body part of the puncher is in a straight rod type.

4. The process for improving green bed permeability according to claim 1, characterized in that: The head of the puncher is in a ring structure.

5. The process for improving green bed permeability according to claim 1, wherein: The head of the puncher is a limiting structure protruding from both sides of the rod body part.

6. The process for improving green bed permeability according to claim 1, wherein: An annular baffle is movably sleeved on the rod body part of the puncher, and the annular baffle is located above the material layer and remains stationary when the puncher is extracted.

7. The process for improving the permeability of the green pellet bed according to claim 6, characterized in that: The annular baffle is pressed on the surface of the material layer.

8. The process for improving green bed permeability according to claim 1, wherein: The puncher is made of ordinary steel or cast iron material.

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