Dust agglomeration prevention device for a belt-type roaster with a matrix burner

Abstract

The utility model belongs to the field of steel smelting, specifically disclose a kind of matrix type burner's belt roaster dust nodulation prevention device. The device includes roaster body, flue, air pipe, combustion chamber, burner and air velocity adjusting device. Multiple burners are arranged in matrix type in the side wall of combustion chamber away from roaster body, and each burner is alternately switched ignition, so that the high-temperature flame sprayed by burner does not stay in the same position in combustion chamber for a long time, to avoid high-temperature flame under the action of secondary air to heat the dust accumulated at the bottom of combustion chamber and produce nodulation. Air velocity adjusting device can adjust the area of ventilation section of air pipe, so as to change the wind speed in air pipe, and then change the air inlet velocity of combustion chamber, which is beneficial to secondary air to blow dust away from combustion chamber, so as to reduce the dust nodulation in combustion chamber and improve the effect of nodulation prevention.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting technology, specifically to a dust prevention and nodule formation device for a matrix burner belt roaster. Background Technology

[0002] Sinter and pellets are two main raw materials for blast furnace ironmaking. The pellet production process reduces pollutants and carbon emissions by 60% and 30% respectively compared to sintering. Therefore, promoting the development of pelletizing technology and increasing the proportion of pellets used in blast furnaces has become one of the important carbon reduction technologies in my country's steel industry under the "dual carbon" context. Currently, my country's pellet production has reached over 220 million tons, and the average usage proportion of pellets in blast furnaces has increased from about 15% to 20%. In the context of optimizing blast furnace burden structure, increasing the proportion of pellets used, and reducing carbon emissions from the long-process blast furnace, improving the production efficiency of the pelletizing process and reducing energy consumption and carbon emissions is crucial.

[0003] When implementing high-proportion pellet blast furnace smelting, it is necessary to produce basic pellets. During the production of basic pellets, a large amount of Ca and Mg-based additives are added to adjust the basicity. The presence of these additives causes the pellets to easily pulverize during roasting, resulting in a large amount of fine powder. This fine powder is carried into the combustion chamber by the strongly compressed cooling air in the cooling section of the belt roaster and tends to accumulate at the bottom of the combustion chamber. Because the high-temperature secondary air enters the combustion chamber from the top, the burner flame in the combustion chamber is forced close to the bottom by the secondary air. Under the high-temperature baking effect of the flame, the fine powder produces ferric oxide and decomposes, thus forming nodules at the bottom of the combustion chamber. If these fine powder particles are not removed in time, the nodules will accumulate, and in severe cases, they will block the combustion chamber, making production of the belt roaster impossible. Therefore, this invention proposes a dust and nodule prevention device for a matrix burner belt roaster to reduce the formation of nodules. Utility Model Content

[0004] The main purpose of this invention is to provide a dust-preventing device for a matrix burner belt roaster, which solves the problem that dust deposits easily form in the combustion chamber of the existing belt roaster, leading to combustion chamber blockage.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A dust-prevention device for a belt calciner with matrix burners includes a calciner body, a flue, air ducts, combustion chambers, and burners. Several combustion chambers are arranged on the side of the calciner body, and the outlet of each combustion chamber is connected to the side wall of the calciner body. The top of the cooling section of the calciner body is connected to the flue, which is connected to the secondary air inlet of each combustion chamber via several air ducts.

[0007] The burners are disposed on the side wall of the combustion chamber away from the roaster body, and there are multiple burners arranged in a matrix. The burners alternately switch ignition. The device also includes a wind speed regulating device, which is used to change the area of ​​the ventilation cross-section of the air duct, thereby changing the wind speed within the air duct.

[0008] The calciner body comprises eight sequentially connected process sections: a forced-air drying section, a forced-air drying section, a preheating section, a first-stage calcination section, a second-stage calcination section, a third-stage calcination section, a first-stage cooling section, and a second-stage cooling section. The pellets are processed sequentially through these sections. In the first-stage cooling section, cold air blown in from below the trolley exchanges heat with the high-temperature pellet bed, generating high-temperature exhaust gas. The flue connects to the top of the first-stage cooling section and transports the high-temperature exhaust gas to each combustion chamber through various ducts. The high-temperature exhaust gas not only introduces sensible heat into the combustion chambers but also acts as a combustion aid for the fuel within the combustion chambers. Depending on specific production needs and conditions, the combustion chambers can be located on one or both sides of the calciner body.

[0009] Specifically, the combustion chamber is cylindrical (e.g., cylindrical), and its axis is perpendicular to the side wall of the calciner body. The air outlet of the combustion chamber is directly connected to the side wall of the calciner body, and the burner is directly opposite the air outlet of the combustion chamber. Furthermore, the bottom surface of the combustion chamber is an inclined surface sloping towards the calciner body to facilitate dust entering the calciner body along the inclined surface.

[0010] Preferably, the flue extends along the length of the roasting machine body. A plurality of combustion chambers are symmetrically arranged on both sides of the roasting machine body. A plurality of air ducts are symmetrically arranged on both sides of the flue. The number of air ducts corresponds to the number of combustion chambers, and each air duct connects to a corresponding combustion chamber.

[0011] In one embodiment, there are eight air ducts and eight combustion chambers, which correspond one-to-one. The eight combustion chambers are symmetrically arranged on both sides of the preheating section, the first roasting section, the second roasting section, and the third roasting section of the roasting machine body. The eight air ducts are symmetrically arranged on both sides of the flue, and the eight air ducts are respectively connected to the eight combustion chambers.

[0012] Preferably, the duct includes a first pipe section, which is inclined upward along the direction of airflow.

[0013] Specifically, the first section of the duct can be directly connected to the flue or connected to the flue via other sections. When secondary air passes through the first section, it needs to ascend along it, causing some fine dust particles to be trapped. These trapped fine dust particles do not enter the combustion chamber, thus reducing dust accumulation within the combustion chamber. The trapped fine dust particles can be removed during maintenance. Furthermore, the flue or duct is equipped with inspection ports for removing dust during maintenance.

[0014] Preferably, the duct further includes a second pipe section. One end of the first pipe section is connected to the flue, the other end of the first pipe section is connected to one end of the second pipe section, and the other end of the second pipe section is connected to the air inlet at the top of the combustion chamber. The second pipe section is vertically arranged.

[0015] Preferably, the center of the burner matrix is ​​located on the central axis of the combustion chamber. The number of burners is at least four.

[0016] This configuration ensures the symmetry and uniformity of the airflow and temperature field within the combustion chamber. Specifically, the number of burners is determined by the size of the combustion chamber, and the burner matrix can be in various forms such as 2x2, 3x3, and 4x4, depending on the number of burners.

[0017] Preferably, the device further includes a main gas pipe, a branch gas pipe, and a solenoid valve. One end of the branch gas pipe is connected to the main gas pipe, and the other end of the branch gas pipe is connected to the burner. The number of branch gas pipes, the solenoid valve, and the burner are all the same, and they correspond one-to-one. Each burner is connected to its corresponding branch gas pipe, and the solenoid valve is located on its corresponding branch gas pipe.

[0018] Furthermore, flow meters are installed on the main gas pipe and the branch gas pipes respectively to detect the gas flow rate.

[0019] Preferably, the wind speed regulating device includes a wind deflector and a driving device. The wind deflector has a plurality of ventilation openings that penetrate its thickness. The air duct has an insertion port, through which the wind deflector is inserted into the air duct. The driving device drives the wind deflector to move along a direction perpendicular to the axis of the air duct segment in which the wind deflector is located.

[0020] Specifically, the deeper the baffle is inserted into the duct section, the smaller the ventilation cross-sectional area of ​​the duct section, and the faster the wind speed. The baffle not only regulates the wind speed but also ensures a more uniform airflow. The vent shape can be rectangular, circular, or diamond-shaped. Furthermore, the device includes an anemometer located at the secondary air inlet of the combustion chamber, and a mounting bracket for installing the drive unit. The anemometer (such as a POLYTEC LDV series laser Doppler velocimeter) is used to detect the intake air velocity in the combustion chamber. The mounting bracket reduces the impact of high temperatures on the drive unit; it can be directly connected to the duct or to a specific mounting base.

[0021] Preferably, the insertion port is located in the second pipe section. The direction of movement of the baffle is perpendicular to the axial direction of the second pipe section.

[0022] Specifically, the baffle plate is perpendicular to the axis of the second pipe section and is inserted into the second pipe section through an insertion port. The vent is rectangular. The driving device is an electric push rod, which is fixed to the outside of the second pipe section, and the movable end of the electric push rod is connected to one end of the baffle plate. The electric push rod can drive the baffle plate to move in a direction perpendicular to the axis of the second pipe section, thereby changing the area of ​​the ventilation cross-section of the second pipe section, and thus changing the air intake velocity of the combustion chamber.

[0023] Preferably, the device further includes a dust thickness detection device, which is disposed at the bottom of the combustion chamber.

[0024] Furthermore, multiple dust thickness detection devices can be installed, each positioned at a different location at the bottom of the combustion chamber. The dust accumulation rate is the maximum value of the dust accumulation rates detected by each dust thickness detection device. In one embodiment, the dust thickness detection device is an ultrasonic dust thickness detector (such as the SONOTEC SONOCHEK series). Ultrasonic dust thickness detectors are existing technology and will not be described in detail here.

[0025] Furthermore, the device also includes a controller (such as a microcontroller), which is connected to the dust thickness detection device, anemometer, solenoid valve and drive device (such as via Bluetooth) for precise control.

[0026] In the technical solution of this utility model, because the first section of the duct is inclined upward along the airflow direction, some fine dust particles need to climb up the duct section when passing through it and are blocked by the duct wall, thus becoming trapped. These trapped fine dust particles do not enter the combustion chamber, which helps reduce dust agglomeration in the combustion chamber. Multiple burners are arranged in a matrix within the combustion chamber, and the burners alternately switch ignition, preventing the high-temperature flames emitted by the burners from remaining in the same position in the combustion chamber for an extended period. This avoids the high-temperature flames from concentrating and heating the dust accumulated at the bottom of the combustion chamber under the action of secondary air, thus preventing agglomeration. The wind speed regulating device can adjust the airflow speed into the combustion chamber, which helps to blow dust away from the combustion chamber, thereby reducing dust agglomeration.

[0027] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0028] 1. The dust-prevention device for the matrix burner belt roaster of this utility model reduces the amount of fine dust entering the combustion chamber through the first pipe section with the air duct set at an incline, thereby reducing dust accumulation in the combustion chamber. It has a simple structure and low cost.

[0029] 2. The matrix burner belt roaster anti-dust caking device of this utility model uses burners arranged in a matrix and ignited alternately in the combustion chamber to prevent the high-temperature flame from heating the dust accumulated at the bottom of the combustion chamber for a long time under the action of secondary air, thus avoiding caking. At the same time, the wind speed regulating device adjusts the air intake speed of the combustion chamber, which helps to blow fine dust particles away from the combustion chamber, thereby preventing a large amount of dust from accumulating in the combustion chamber and causing caking. The anti-caking effect is good, which can prevent the combustion chamber from being blocked and improve the operating efficiency of the belt roaster. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the anti-dust and anti-nodulation device for the matrix burner belt roaster of this utility model.

[0031] Figure 2 This is a schematic diagram showing the connection of the flue, air duct, combustion chamber, and roaster body of the matrix burner belt roaster anti-dust nodule device of this utility model.

[0032] Figure 3 This is a schematic diagram of the burner arrangement for the matrix burner belt roaster anti-dust nodulation device of this utility model.

[0033] Figure 4 This is a schematic diagram of the wind speed adjustment device of the anti-dust and nodulation device for the matrix burner belt roaster of this utility model.

[0034] Reference numerals in the attached drawings: 1: flue; 2: air duct; 201: first pipe section; 202: second pipe section; 3: combustion chamber; 301: conical surface; 4: burner; 5: roaster body; 6: wind speed regulating device; 601: wind baffle; 602: vent; 7: dust thickness detection device. Detailed Implementation

[0035] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0036] Please refer to Figures 1 to 4 A dust-prevention device for a belt roaster with matrix burners includes a roaster body 5, a flue 1, air ducts 2, combustion chambers 3, and burners 4. Several combustion chambers 3 are arranged on the side of the roaster body 5, and the outlet of each combustion chamber 3 is connected to the side wall of the roaster body 5. The top of the cooling section of the roaster body 5 is connected to the flue 1, and the flue 1 is connected to the secondary air inlet of each combustion chamber 3 through several air ducts 2.

[0037] The burners 4 are disposed on the side wall of the combustion chamber 3 away from the roaster body 5, and there are multiple burners 4 arranged in a matrix. The burners 4 alternately switch ignition. The device also includes a wind speed regulating device 6, which is used to change the area of ​​the ventilation cross-section of the air duct 2, thereby changing the wind speed in the air duct 2.

[0038] Preferably, the flue 1 extends along the length of the roasting machine body 5. A plurality of combustion chambers 3 are symmetrically arranged on both sides of the roasting machine body 5. A plurality of air ducts 2 are symmetrically arranged on both sides of the flue 1. The number of air ducts 2 is the same as the number of combustion chambers 3, and they correspond one-to-one; each air duct 2 connects to its corresponding combustion chamber 3.

[0039] Preferably, the duct 2 includes a first duct section 201, which is inclined upward along the direction of airflow.

[0040] Preferably, the duct 2 further includes a second duct section 202. One end of the first duct section 201 is connected to the flue 1, the other end of the first duct section 201 is connected to one end of the second duct section 202, and the other end of the second duct section 202 is connected to the air inlet at the top of the combustion chamber 3. The second duct section 202 is vertically arranged.

[0041] Preferably, the center of the burner matrix formed by the burners 4 is located on the central axis of the combustion chamber 3. The number of burners 4 is at least four.

[0042] Preferably, the device further includes a main gas pipe, a branch gas pipe, and a solenoid valve. One end of the branch gas pipe is connected to the main gas pipe, and the other end of the branch gas pipe is connected to the burner 4. The number of branch gas pipes, the solenoid valve, and the burner 4 are all the same, and they correspond one-to-one. Each burner 4 is connected to its corresponding branch gas pipe, and the solenoid valve is located on its corresponding branch gas pipe.

[0043] Preferably, the wind speed regulating device 6 includes a wind deflector 601 and a driving device. The wind deflector 601 has a plurality of ventilation openings 602 that penetrate the thickness of the plate. The air duct 2 has an insertion port, through which the wind deflector 601 is inserted into the air duct 2. The driving device drives the wind deflector 601 to move along a direction perpendicular to the axis of the air duct 2 segment containing the wind deflector 601.

[0044] Preferably, the insertion port is located in the second pipe section 202. The direction of movement of the baffle plate 601 is perpendicular to the axial direction of the second pipe section 202.

[0045] Preferably, the device further includes a dust thickness detection device 7, which is disposed at the bottom of the combustion chamber 3.

[0046] Example 1

[0047] like Figure 1-4 As shown, a dust-prevention device for a belt calciner with matrix burners includes a calciner body 5, a flue 1, air ducts 2, combustion chambers 3, and burners 4. Several combustion chambers 3 are arranged on the side of the calciner body 5, and the outlet of each combustion chamber 3 is connected to the side wall of the calciner body 5. The top of the cooling section of the calciner body 5 is connected to the flue 1, and the flue 1 is connected to the secondary air inlet of each combustion chamber 3 through several air ducts 2.

[0048] The burners 4 are disposed on the side wall of the combustion chamber 3 away from the roaster body 5, and there are multiple burners 4 arranged in a matrix. The burners 4 alternately switch ignition. The device also includes a wind speed regulating device 6, which is used to change the area of ​​the ventilation cross-section of the air duct 2, thereby changing the wind speed in the air duct 2.

[0049] Example 2

[0050] The embodiment 1 is repeated, except that the flue 1 extends along the length of the roasting machine body 5. Eight combustion chambers 3 are symmetrically arranged on both sides of the roasting machine body 5. Eight air ducts 2 are symmetrically arranged on both sides of the flue 1. Each air duct 2 corresponds to one combustion chamber 3, and the air duct 2 is connected to the corresponding combustion chamber 3.

[0051] Example 3

[0052] The embodiment 2 is repeated, except that the duct 2 includes a first duct section 201, which is inclined upward along the direction of airflow.

[0053] Example 4

[0054] The embodiment 3 is repeated, except that the duct 2 further includes a second pipe section 202. One end of the first pipe section 201 is connected to the flue 1, and the other end of the first pipe section 201 is connected to one end of the second pipe section 202. The other end of the second pipe section 202 is connected to the air inlet at the top of the combustion chamber 3. The second pipe section 202 is vertically arranged.

[0055] Example 5

[0056] Example 4 is repeated, except that the center of the burner matrix formed by the burners 4 is located on the central axis of the combustion chamber 3. The number of burners 4 is 4.

[0057] Example 6

[0058] The same method as Embodiment 5 is used, except that the device also includes a main gas pipe, a branch gas pipe, and a solenoid valve. One end of the branch gas pipe is connected to the main gas pipe, and the other end of the branch gas pipe is connected to the burner 4. The number of branch gas pipes, solenoid valves, and burners 4 are all the same, and they correspond one-to-one. Each burner 4 is connected to its corresponding branch gas pipe, and each solenoid valve is located on its corresponding branch gas pipe.

[0059] Example 7

[0060] The embodiment 6 is repeated, except that the wind speed regulating device 6 includes a baffle plate 601 and a driving device. The baffle plate 601 has several evenly spaced ventilation openings 602 penetrating the plate thickness. The air duct 2 has an insertion port, through which the baffle plate 601 is inserted into the air duct 2. The driving device drives the baffle plate 601 to move along a direction perpendicular to the axis of the air duct 2 segment containing the baffle plate 601.

[0061] Example 8

[0062] The embodiment 7 is repeated, except that the insertion port is located in the second pipe section 202. The direction of movement of the baffle 601 is perpendicular to the axial direction of the second pipe section 202.

[0063] The baffle plate 601 is perpendicular to the axis of the second pipe section 202 and is inserted into the second pipe section 202 through an insertion port. The vent 602 is rectangular. The driving device is an electric push rod, which is fixed to the outside of the second pipe section 202, and the movable end of the electric push rod is connected to one end of the baffle plate 601. The electric push rod can drive the baffle plate 601 to move in a direction perpendicular to the axis of the second pipe section 202.

[0064] Example 9

[0065] The embodiment 8 is repeated, except that the device also includes a dust thickness detection device 7, which is disposed at the bottom of the combustion chamber 3.

[0066] Among them, the dust thickness detection device 7 is an ultrasonic dust thickness detector.

Claims

1. A dust-prevention device for a belt roaster with matrix burners, comprising a roaster body (5), a flue (1), an air duct (2), a combustion chamber (3), and burners (4), characterized in that: The roasting machine body (5) has several combustion chambers (3) on its side, and the outlet of each combustion chamber (3) is connected to the side wall of the roasting machine body (5); the top of the cooling section of the roasting machine body (5) is connected to the flue (1), and the flue (1) is connected to the secondary air inlet of each combustion chamber (3) through several air ducts (2). The burner (4) is disposed on the side wall of the combustion chamber (3) away from the roaster body (5), and there are multiple burners (4) arranged in a matrix; the burners (4) alternately switch ignition; the device also includes a wind speed regulating device (6), which is used to change the area of ​​the ventilation cross section of the air duct (2), thereby changing the wind speed in the air duct (2).

2. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 1, characterized in that: The flue (1) extends along the length of the roasting machine body (5); a number of combustion chambers (3) are symmetrically arranged on both sides of the roasting machine body (5); a number of air ducts (2) are symmetrically arranged on both sides of the flue (1); the number of air ducts (2) is the same as that of the combustion chambers (3), and they correspond one-to-one, and the air ducts (2) are connected to the corresponding combustion chambers (3).

3. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 1, characterized in that: The duct (2) includes a first pipe section (201), which is inclined upward along the direction of airflow.

4. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 3, characterized in that: The air duct (2) also includes a second pipe section (202); one end of the first pipe section (201) is connected to the flue (1), the other end of the first pipe section (201) is connected to one end of the second pipe section (202), and the other end of the second pipe section (202) is connected to the air inlet at the top of the combustion chamber (3); the second pipe section (202) is vertically arranged.

5. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 1, characterized in that: The center of the burner matrix formed by the burners (4) is located on the central axis of the combustion chamber (3); the number of burners (4) is at least 4.

6. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to any one of claims 1 to 5, characterized in that: The device also includes a main gas pipe, a branch gas pipe, and a solenoid valve; one end of the branch gas pipe is connected to the main gas pipe, and the other end of the branch gas pipe is connected to the burner (4); the number of the branch gas pipe, the solenoid valve, and the burner (4) are all the same and correspond one-to-one; the burner (4) is connected to the corresponding branch gas pipe, and the solenoid valve is located on the corresponding branch gas pipe.

7. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 4, characterized in that: The wind speed regulating device (6) includes a wind deflector (601) and a driving device; the wind deflector (601) is provided with a plurality of ventilation openings (602) that penetrate the thickness of the plate; the air duct (2) is provided with an insertion port, and the wind deflector (601) is inserted into the air duct (2) through the insertion port; the driving device drives the wind deflector (601) to move along the axis of the air duct (2) section where the wind deflector (601) is located.

8. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 7, characterized in that: The insertion port is located in the second pipe section (202); the direction of movement of the baffle plate (601) is perpendicular to the axial direction of the second pipe section (202).

9. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to any one of claims 1-5 and 7-8, characterized in that: The device also includes a dust thickness detection device (7), which is located at the bottom of the combustion chamber (3).

10. The anti-dust and anti-nodulation device for a belt roaster with a matrix burner according to claim 6, characterized in that: The device also includes a dust thickness detection device (7), which is located at the bottom of the combustion chamber (3).

Images