Automatic limestone powder feeding device for coal injection duct

Abstract

The utility model discloses an automatic limestone powder feeding device for a coal injection duct, which belongs to the field of pulverized coal desulfurization and is arranged on the coal injection duct and comprises a driving mechanism penetrating through the coal injection duct and a spiral feeding mechanism arranged below the driving mechanism. The driving mechanism comprises a windmill shaft, and a windmill is fixedly connected to the windmill shaft; the spiral feeding mechanism penetrates through the coal injection pipe and comprises a transmission shaft, and the other end of the transmission shaft is connected with a spiral rod assembly; the screw rod assembly comprises a screw rod, one end of the screw rod is fixedly connected with the transmission shaft, and the other end of the screw rod is connected with a limestone powder making device; a transmission component is arranged between the driving mechanism and the spiral feeding mechanism; the device has the advantages of being high in automation degree, good in sealing performance, simple and reliable in structure, high in flexibility and the like, and has important significance for improving the production efficiency, reducing the production cost and protecting the production environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal powder desulfurization, in particular to an automatic feeding device for limestone powder of a coal injection pipe. Background Art

[0002] In blast furnace smelting, the problem of high sulfur content in injected coal powder is usually solved by adding limestone powder to the coal powder. The current method of adding limestone powder is to add the limestone powder into the coal powder through a belt before the coal powder is injected into the coal injection pipe. The water content of the coal powder is relatively high before it is injected into the coal injection pipe. The water in the coal powder will react with the limestone powder first, resulting in a decrease in the desulfurization effect of the limestone powder. Utility Model Content

[0003] Aiming at the existing technology that limestone powder is added during coal powder desulfurization, the limestone powder easily reacts with water in the coal powder and affects the desulfurization effect, the utility model provides an automatic feeding device for limestone powder in a coal injection pipe, which is used for adding limestone powder while injecting coal powder.

[0004] The utility model is implemented as follows: an automatic feeding device for limestone powder in a coal-injection pipe, the automatic feeding device is arranged on the coal-injection pipe, the automatic feeding device comprises a driving mechanism penetrating the coal-injection pipe, and a spiral feeding mechanism arranged below the driving mechanism; the driving mechanism comprises a windmill shaft, a windmill is fixedly connected to the windmill shaft, and the windmill rotates under the impact of coal powder airflow; the spiral feeding mechanism penetrates the coal-injection pipe, the spiral feeding mechanism comprises a transmission shaft, and a spiral rod assembly is connected to the other end of the transmission shaft; the spiral rod assembly comprises a spiral rod, one end of the spiral rod is fixedly connected to the transmission shaft, and the other end of the spiral rod is connected to a limestone powder making device; a transmission component is arranged between the driving mechanism and the spiral feeding mechanism, and the transmission component transmits the windmill rotation torque of the driving mechanism to the spiral feeding mechanism.

[0005] Furthermore, the spiral rod assembly includes an ash conveying pipe that penetrates the wall of the coal injection pipe. The ash conveying pipe is fixed in the wall of the coal injection pipe. The outer diameter of the ash conveying pipe is set to be equal to the inner diameter of the installation hole in the wall of the coal injection pipe to prevent coal powder from leaking through the installation hole.

[0006] Furthermore, one end of the ash conveying pipe extends to the axis of the coal injection pipe, and the other end of the ash conveying pipe is connected to the limestone powder making device.

[0007] Furthermore, a transmission sleeve is provided on the circumferential surface of the transmission shaft, and the transmission sleeve is a sealing sleeve.

[0008] Furthermore, the transmission sleeve is fixed through the coal injection pipe wall, and the outer diameter of the transmission sleeve is set to be equal to the inner diameter of the installation hole on the coal injection pipe wall to prevent coal powder from leaking through the installation hole.

[0009] Furthermore, windmill shaft sleeves are provided at both circumferential ends of the windmill shaft, and the windmill shaft sleeves are sealing sleeves.

[0010] Furthermore, the windmill shaft sleeve is fixed through the coal injection pipe wall; the outer diameter of the windmill shaft sleeve is equal to the inner diameter of the installation hole of the coal injection pipe wall, so as to avoid airflow leakage through the installation hole.

[0011] Furthermore, one end of the windmill shaft and one end of the transmission shaft extend out along the coal injection pipe respectively, and one end of the windmill shaft and one end of the transmission shaft are respectively transmission-connected with the transmission component.

[0012] The utility model has the following advantages and technical effects:

[0013] 1. High degree of automation: The rotation of the windmill under the impact of coal powder airflow realizes the automatic driving of the driving mechanism, thereby realizing the automatic feeding of limestone powder without manual operation, thus improving production efficiency.

[0014] 2. Good sealing: The transmission shaft sleeve and windmill shaft sleeve in the device are both sealed shaft sleeves, and their outer diameter is set to be equal to the inner diameter of the installation hole on the wall of the coal injection pipe, which effectively avoids the leakage of airflow through the installation hole, ensuring the cleanliness of the production environment and the effective use of coal powder.

[0015] 3. Simple structure and high reliability: The device uses a windmill as the driving source, and transmits the torque to the spiral feeding mechanism through the transmission component. The structure is simple and easy to maintain. At the same time, the design of the spiral rod assembly enables the limestone powder to be evenly and continuously fed into the coal injection pipe, ensuring the stability and reliability of the feeding.

[0016] 4. High flexibility: The other end of the ash conveying pipe is connected to the limestone powder making device, making the source of limestone powder controllable and easy to replace. In addition, one end of the windmill shaft and the transmission shaft extends out of the coal injection pipe, which is convenient for increasing the internal space and reducing resistance.

[0017] 5. Energy saving and environmental protection: The windmill is powered by coal powder airflow, which does not require additional energy input and reduces energy consumption. At the same time, in order to ensure good sealing performance, precision machine tools are used to perform equal diameter processing between components to achieve zero-difference plug-in matching, avoiding welding connections between components to ensure sealing performance, making the processing more energy-saving and environmentally friendly.

[0018] In summary, the automatic feeding device of the coal injection pipe limestone powder of this device has the advantages of high degree of automation, good sealing, simple and reliable structure, high flexibility, energy saving and environmental protection, etc., which is of great significance for improving production efficiency, reducing production costs and protecting the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a front view provided by an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 AA section view.

[0021] In the figure: 1. coal injection pipe; 2. transmission component; 3. windmill shaft sleeve; 4. windmill shaft; 5. transmission shaft; 6. transmission shaft sleeve; 7. spiral feeding mechanism; 8. windmill; 9. screw rod assembly; 10. screw rod; 11. ash conveying pipe; 12. automatic feeding device; 13. driving mechanism. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0023] In order to improve the desulfurization effect of limestone powder, the utility model provides an automatic feeding device for limestone powder in coal injection pipe, see Figure 1 , Figure 2 , including an automatic feeding device 12 arranged on the coal injection pipe 1, the automatic feeding device 12 includes a driving mechanism 13 that penetrates the coal injection pipe 1, and a spiral feeding mechanism 7 arranged below the driving mechanism 13, and the spiral feeding mechanism 7 penetrates the coal injection pipe 1.

[0024] The driving mechanism 13 includes a windmill shaft 4, on which a windmill 8 is fixedly connected. The windmill 8 rotates under the impact of the coal-injection airflow, and the windmill 8 drives the windmill shaft 4 to rotate; one end of the windmill shaft 4 extends along the coal-injection pipe 1, and the extended end of the windmill shaft 4 is sleeved with a transmission component 2; the transmission component 2 is arranged outside the coal-injection pipe 1, that is, the transmission component 2 is external to the coal-injection pipe 1. Windmill shaft sleeves 3 are arranged at both ends of the windmill shaft 4 in the circumferential direction, and the windmill shaft sleeves 3 are sealing sleeves; the windmill shaft sleeves 3 are fixedly connected to the wall of the coal-injection pipe 1; the outer diameter of the windmill shaft sleeve 3 is equal to the inner diameter of the installation hole of the coal-injection pipe 1, so as to prevent coal powder and airflow from leaking through the installation hole.

[0025] The spiral feeding mechanism 7 includes a transmission shaft 5, one end of which extends along the coal injection pipe 1, and the extended end is sleeved with the transmission component 2, that is, the transmission component 2 is externally connected between the driving mechanism 13 and the spiral feeding mechanism 7; the transmission component 2 transmits the torque of the windmill shaft 4 to the transmission shaft 5, that is, the transmission component 2 transmits the torque of the driving mechanism 13 to the spiral feeding mechanism 7; further, the transmission component 2 is set as a crawler. The circumferential surface of the transmission shaft 5 is provided with a transmission sleeve 6, and the transmission sleeve 6 is a sealing sleeve; the transmission sleeve 6 is fixed on the wall of the coal injection pipe 1, and the outer diameter of the transmission sleeve 6 is set to be equal to the inner diameter of the installation hole of the coal injection pipe 1 wall to prevent airflow from leaking through the installation hole.

[0026] The other end of the transmission shaft 5 is connected to a screw rod assembly 9, which includes an ash conveying pipe 11 that penetrates the wall of the coal injection pipe 1. The ash conveying pipe 11 is fixed in the wall of the coal injection pipe 1. The outer diameter of the ash conveying pipe 11 is set equal to the inner diameter of the installation hole of the wall of the coal injection pipe 1 to prevent coal powder from leaking through the installation hole; one end of the ash conveying pipe 11 extends to the central axis of the coal injection pipe 1, and the ash conveying pipe 11 adds limestone powder to the middle of the coal injection pipe 1 to make the limestone powder and coal powder mixed more evenly; the other end of the ash conveying pipe 11 is connected to a limestone powder making device to achieve the purpose of continuously conveying limestone powder. The screw rod assembly 9 also includes a screw rod 10, one end of which is fixedly connected to the transmission shaft 5, and the screw rod 10 rotates synchronously with the transmission shaft 5, and the other end of the screw rod 10 is connected to the limestone powder making device; the circumferential surface of the screw rod 10 is set as a spiral surface, and the spiral surface brings limestone powder into the coal injection pipe 1 when the screw rod 10 rotates.

[0027] The following is an introduction to the use of this device:

[0028] The coal injection pipe 1 is divided into two parts along the plane where the central axis is located, and then the assembled automatic feeding device is installed in the coal injection pipe 1, and then the divided coal injection pipe 1 is welded.

[0029] When pulverized coal is injected into the blast furnace, the high-pressure gas drives the pulverized coal to pass through the coal injection pipe 1. The high-pressure gas drives the windmill 8 to rotate in real time, providing a rotational force for the windmill shaft 4, which is then transmitted to the transmission shaft 5 through the transmission member 2. The transmission shaft 5 drives the screw rod 10 to rotate. The spiral surface shape of the screw rod 10 brings the limestone powder into the coal injection pipe 1 when rotating.

[0030] When limestone powder is used to desulfurize coal powder, the weight ratio of coal powder to limestone powder is about 1200:1, which meets the requirements of coal powder desulfurization; the normal working pressure of the coal injection pipe 1 is ≥0.8 MPa. When the cross section is perpendicular to the airflow, the maximum output torque is 2kg by calculating the windmill action cross section 2cm². As long as the load of the spiral feeding mechanism is less than the output torque of the driving mechanism, the device can operate normally. Since the specific gravity output by the spiral feeding mechanism 7 is much smaller than the specific gravity of coal powder, the windmill 8 can continue to rotate rapidly, and then the outer diameter of the output end of the windmill shaft 4 is processed to be smaller than the outer diameter of the transmission shaft 5, and the speed of the transmission shaft 5 is reduced by the transmission ratio. At the same time, the speed is controlled by fine-tuning the injection pressure of the coal powder. The weight of limestone powder added is detected by the gravity sensor, and the injection pressure parameters are determined by the actual measurement results of the weight of limestone powder added per unit time to meet the automatic addition ratio requirements of limestone powder.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic feeding device for limestone powder in a coal injection pipe, the automatic feeding device being arranged on the coal injection pipe (1), characterized in that: The automatic feeding device (12) comprises a driving mechanism (13) penetrating the coal injection pipe (1), and a spiral feeding mechanism (7) arranged below the driving mechanism (13); The driving mechanism (13) comprises a windmill shaft (4), a windmill (8) is fixedly connected to the windmill shaft (4), and the windmill (8) rotates under the impact of coal powder airflow; The spiral feeding mechanism (7) passes through the coal injection pipe (1), and the spiral feeding mechanism (7) comprises a transmission shaft (5), and the other end of the transmission shaft (5) is connected to a spiral rod assembly (9); The screw rod assembly (9) comprises a screw rod (10), one end of the screw rod (10) is fixedly connected to the transmission shaft (5), and the other end of the screw rod (10) is connected to a limestone powder making device; A transmission component (2) is externally connected between the driving mechanism (13) and the screw feeding mechanism (7), and the transmission component (2) transmits the windmill rotation torque of the driving mechanism (13) to the screw feeding mechanism (7).

2. The automatic feeding device for limestone powder in coal injection pipe according to claim 1, characterized in that: The spiral rod assembly (9) comprises an ash conveying pipe (11) penetrating the wall of the coal injection pipe (1), the ash conveying pipe (11) being fixed in the wall of the coal injection pipe (1), and the outer diameter of the ash conveying pipe (11) being equal to the inner diameter of the installation hole in the wall of the coal injection pipe (1) to prevent coal powder from leaking through the installation hole.

3. The automatic feeding device for limestone powder in coal injection pipe according to claim 2 is characterized in that: One end of the ash conveying pipe (11) extends to the axis of the coal injection pipe (1), and the other end of the ash conveying pipe (11) is connected to a limestone powder making device.

4. The automatic feeding device for limestone powder in coal injection pipe according to claim 3 is characterized in that: A transmission sleeve (6) is provided on the circumferential surface of the transmission shaft (5), and the transmission sleeve (6) is a sealing sleeve.

5. The automatic feeding device for limestone powder in coal injection pipe according to claim 4 is characterized in that: The transmission shaft sleeve (6) penetrates and is fixed on the wall of the coal injection pipe (1), and the outer diameter of the transmission shaft sleeve (6) is set to be equal to the inner diameter of the installation hole on the wall of the coal injection pipe (1), so as to prevent coal powder from leaking through the installation hole.

6. The automatic feeding device for limestone powder in coal injection pipe according to claim 1, characterized in that: Windmill shaft sleeves (3) are provided at both ends of the windmill shaft (4) in the circumferential direction, and the windmill shaft sleeves (3) are sealing shaft sleeves.

7. The automatic feeding device for limestone powder in coal injection pipe according to claim 6, characterized in that: The windmill shaft sleeve (3) penetrates and is fixed on the wall of the coal injection pipe (1); the outer diameter of the windmill shaft sleeve (3) is equal to the inner diameter of the installation hole on the wall of the coal injection pipe (1), thereby preventing airflow from leaking through the installation hole.

8. The automatic feeding device for limestone powder in coal injection pipe according to any one of claims 1 to 7, characterized in that: One end of the windmill shaft (4) and one end of the transmission shaft (5) extend out along the coal injection pipe (1) respectively, and one end of the windmill shaft (4) and one end of the transmission shaft (5) are respectively connected to the transmission component (2).

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