Energy-saving anti-coking ignition furnace and ignition control method thereof

Abstract

The application discloses an energy-saving anti-nodular ignition furnace and an ignition control method thereof. The ignition furnace comprises an ignition furnace body, a plurality of first ignition nozzles are uniformly arranged on the top of the left end of the ignition furnace body in the longitudinal direction, the middle part of the ignition furnace body is a circular-arc furnace top, a plurality of second ignition nozzles are arranged in the circular-arc furnace top in the circumferential direction, a plurality of hot air nozzles are arranged on one side wall in the circular-arc furnace top, and the hot air nozzles provide transverse hot air sweeping in the circular-arc furnace top. The ignition control method comprises the following steps: controlling the proportion of gas and air in the first gas pipe and the second gas pipe; providing transverse sweeping hot air in the circular-arc furnace top; and reducing the air flow in the second gas pipe, and the reduced air flow is equal to the hot air flow in the first hot air pipe. The application greatly reduces the generation of nodular substances near the burner of the ignition furnace, reduces the heavy labor of cleaning the nodular substances by using artificial cleaning, simultaneously improves the sintering effect of the edge of the sintered fabric, and improves the sintering quality of the sintered fabric.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, and in particular relates to an energy-saving anti-nodulation ignition furnace and its ignition control method. Background Technology

[0002] After the material is placed on the sintering trolley, the material surface needs to be ignited, which is usually done using an ignition furnace. In current ignition furnace structures, the burners are fixed to the furnace shell steel structure via their own mounting plates. Because the mixed material on both sides of the sintering machine often protrudes above the sintering trolley's side rails, it is usually dried during ignition. This dried material scatters inside the furnace, gradually forming hard-to-clean nodules near the burners, significantly impacting ignition efficiency and gas consumption. Furthermore, the gas pressure at the end of the gas pipeline is often lower than at the front, resulting in poor ignition performance at the end burners, leading to a large amount of raw material at the edges of the sintering material.

[0003] Chinese patent specification discloses a sintering ignition furnace (publication number CN 213208649U), specifically disclosing the following: It includes a furnace body, several rows of ignition nozzles arranged on the furnace body, and several rows of arc-shaped slides on the furnace body, the centers of which are located in the direction of travel of the sintering machine trolley; several independently controlled ignition nozzles are movably installed in each arc-shaped slide, corresponding to the independently controlled edge ignition nozzles on both sides of the sintering machine's edge. The ignition intensity of the entire sintering material surface is changed by adjusting the position of each ignition nozzle. This patent improves the edge ignition effect of the sintering material surface and enhances the quality of the sintered ore, but it does not propose a solution to the problem of nodule formation within the furnace. Summary of the Invention

[0004] I. Technical problems to be solved

[0005] This invention proposes an energy-saving anti-nodulation ignition furnace and its ignition control method, the purpose of which is to solve the problem of nodule-like substances that are easy to form and difficult to clean near the burner of the ignition furnace.

[0006] II. Technical Solution

[0007] To achieve the above objectives, the present invention adopts the following technical solution.

[0008] The energy-saving, anti-nodulation ignition furnace of the present invention includes:

[0009] The furnace body has multiple single-stage ignition nozzles evenly arranged longitudinally on the top left side. Each single-stage ignition nozzle is connected to a gas pipe outside the furnace body. The middle part of the furnace body is an arc-shaped furnace top. Multiple double-stage ignition nozzles are arranged circumferentially inside the arc-shaped furnace top. Each double-stage ignition nozzle is connected to two gas pipes outside the furnace body. Multiple hot air nozzles are provided on one side wall of the inner side of the arc-shaped furnace top. Each hot air nozzle is connected to a first hot air pipe outside the furnace body and provides transverse hot air blowing into the arc-shaped furnace top.

[0010] Furthermore, the arc-shaped furnace top has an arc of 15 degrees. 0 The height h between the top of the inner circumference of the arc-shaped furnace top and the top surface of the ignition furnace body is 30cm.

[0011] Furthermore, the two-stage igniter is divided into a large-diameter igniter and a small-diameter igniter. The large-diameter igniters are evenly distributed along the circumference of the arc-shaped furnace top, while the small-diameter igniters are distributed on both sides of the arc-shaped furnace top. The spacing between the large-diameter igniters is greater than the spacing between the small-diameter igniters.

[0012] Furthermore, a pressure detector is installed at the top inside the arc-shaped furnace top, and the pressure detector is located on the side near the hot air nozzle.

[0013] Furthermore, the end of one gas pipe is connected to the end of the second gas pipe via a connecting pipe.

[0014] Furthermore, the first hot air duct is equipped with a shut-off valve, an air volume regulating valve, and an air volume detector, while the second gas duct is equipped with an air flow regulating valve.

[0015] Furthermore, an air curtain assembly is provided at the right end of the ignition furnace body. The air curtain assembly is connected to a second hot air pipe outside the ignition furnace body through a pipe, and the air curtain assembly provides a vertical hot air curtain to the interior of the ignition furnace body.

[0016] Preferably, the shut-off valve, air volume regulating valve, air volume detector, pressure detector, and air flow regulating valve are all electrically connected to the PLC controller.

[0017] The ignition control method of the present invention includes the following specific steps:

[0018] 1) Start ignition;

[0019] 2) Control the ratio of gas to air in the first and second gas pipes, i.e., the gas flow rate / air flow rate is the rated value;

[0020] 3) Monitor the pressure inside the arc-shaped furnace top using a pressure detector. Check if the pressure is greater than 1.0 kPa. If yes, proceed to the next step; otherwise, return to step 2).

[0021] 4) Open the shut-off valve, and the air volume regulating valve is at its minimum opening. Provide horizontal purging hot air into the arc-shaped furnace top, and at the same time monitor the hot air flow rate in the first hot air pipe through the air volume detector.

[0022] 5) Adjust the air flow regulating valve on the second-stage gas pipe to reduce the air flow in the second-stage gas pipe. The reduction in air flow is equal to the reduction in hot air flow in the first hot air pipe.

[0023] 6) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; if not, return to step 2).

[0024] 7) Gradually increase the opening of the air volume regulating valve and monitor the hot air flow in the first hot air pipe through the air volume detector, while reducing the air flow in the second gas pipe by the same amount.

[0025] 8) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; otherwise, return to step 4).

[0026] 9) Maintain the maximum allowable value of hot air flow in the first hot air duct, while reducing the air flow value in the second gas duct by the same amount;

[0027] 10) Continue ignition until it ends.

[0028] Furthermore, the maximum allowable hot air flow rate in the first hot air duct is 1.6 m³ / s. 3 / minute.

[0029] III. Beneficial Effects

[0030] The present invention relates to an energy-saving anti-nodulation ignition furnace and its ignition control method, which greatly reduces the generation of nodules near the burner of the ignition furnace, reduces the heavy labor of manually cleaning nodules, and also improves the sintering effect of the edge of the sintering fabric, thereby improving the sintering quality of the sintering fabric. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the main structure of the energy-saving anti-nodulation ignition furnace of the present invention.

[0032] Figure 2 yes Figure 1 A top view and partial cross-sectional structural schematic diagram.

[0033] Figure 3 yes Figure 1 A schematic diagram of the AA cross-sectional structure.

[0034] Figure 4 yes Figure 1 Schematic diagram of the BB cross-section structure.

[0035] Figure 5 yes Figure 1A schematic diagram of the CC cross-section structure.

[0036] Figure 6 yes Figure 1 Schematic diagram of the DD cross-sectional structure.

[0037] Figure 7 This is a flowchart of the ignition control method of the present invention. Detailed Implementation

[0038] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can have a clearer understanding.

[0039] Example 1

[0040] like Figure 1 , Figure 2 , Figure 3 As shown, the energy-saving anti-nodulation ignition furnace of the present invention includes: an ignition furnace body 1. The ignition method of the ignition furnace is divided into single-stage ignition and two-stage ignition. In the second-stage ignition stage, the furnace top adopts an arc-shaped design to increase the height of the furnace chamber and eliminate the influence of cold air from both sides of the ignition furnace on the second-stage ignition. The arc-shaped furnace top 2 is located in the middle of the ignition furnace body, occupying 1 / 3 of the entire ignition furnace body area. The arc of the arc-shaped furnace top 2 is 15 degrees. 0 The height h between the top of the inner circumference of the arc-shaped furnace top 2 and the top surface of the furnace body 1 is 30cm. For example... Figure 2 , Figure 3 As shown, multiple two-stage ignition nozzles 3 are arranged circumferentially within the arc-shaped furnace top 2. These two-stage ignition nozzles, in conjunction with the arc-shaped furnace top 2, are arranged along the curve of the furnace top. The two-stage ignition nozzles 3 are divided into large-diameter ignition nozzles 3-1 and small-diameter ignition nozzles 3-2. The large-diameter ignition nozzles are evenly distributed along the circumference of the arc-shaped furnace top, while the small-diameter ignition nozzles are distributed on both sides of the arc-shaped furnace top. The spacing between the large-diameter ignition nozzles 3-1 is greater than the spacing between the small-diameter ignition nozzles 3-2. That is, the number of large-diameter ignition nozzles distributed circumferentially along the arc-shaped furnace top is less than the number of small-diameter ignition nozzles on both sides of the arc-shaped furnace top. The purpose of this is to utilize the characteristic of the arc-shaped furnace top to concentrate heat energy, thereby achieving an energy-saving effect. Figure 2 As shown, the two-stage igniter is connected to the two-stage gas pipe 7 outside the ignition furnace body 1, and the two-stage gas pipe 7 is equipped with an air flow regulating valve 16.

[0041] Since most of the nodules in the ignition furnace are located at the second ignition stage, this invention employs hot air purging on the right side of the second ignition stage to appropriately reduce the temperature at the top of the arc-shaped furnace roof. This temperature difference is used to solve the problem of nodules inside the ignition furnace. To achieve this goal, as... Figure 1 , Figure 2 , Figure 5As shown, the present invention has multiple hot air nozzles 6 on the right side wall of the two-stage ignition inside the arc-shaped furnace top 2. The hot air nozzles 6 are distributed in an arc shape and are connected to the first hot air pipe 5 outside the ignition furnace body. The first hot air pipe 5 is equipped with a shut-off valve 13, an air volume regulating valve 14, and an air volume detector 15. The hot air nozzles provide transverse hot air to the inside of the arc-shaped furnace top.

[0042] In order to monitor the pressure inside the ignition furnace in real time, such as Figure 5 As shown, a pressure detector 18 is installed at the top inside the arc-shaped furnace top 2, with the pressure detector located on the side near the hot air nozzle 6.

[0043] like Figure 2 , Figure 4 As shown, multiple short-stage igniters 4 are evenly arranged longitudinally on the top left end of the ignition furnace body 1, and each short-stage igniter is connected to a section of gas pipe 8 outside the ignition furnace body 1.

[0044] Because the gas pressure at the end of the gas pipeline is often lower than at the beginning, the ignition effect of the end igniter is poor, resulting in a large amount of raw material appearing at the edges of the sintering material. To overcome this phenomenon, such as... Figure 1 , Figure 2 As shown, the present invention connects the end of a gas pipe 8 to the end of a second gas pipe 7 via a connecting pipe 12, thereby balancing the gas pressure in the front and rear gas pipelines.

[0045] As a preferred embodiment of the present invention, the shut-off valve 13, the air volume regulating valve 14, the air volume detector 15, the pressure detector 18, and the air flow regulating valve 16 are all electrically connected to the PLC controller.

[0046] An air curtain assembly 11 is provided at the right end of the furnace body 1. The air curtain assembly is connected to the second hot air pipe 9 outside the furnace body 1 through the pipe 10. The air curtain assembly provides a vertical hot air curtain to the interior of the furnace body 1 to isolate the heat conduction between the furnace interior and the outside.

[0047] The ignition control method of the present invention specifically includes the following steps:

[0048] 1) Start ignition;

[0049] 2) Control the ratio of gas to air in the first and second gas pipes, i.e., the gas flow rate / air flow rate is the rated value;

[0050] 3) Monitor the pressure inside the arc-shaped furnace top using a pressure detector. Check if the pressure is greater than 1.0 kPa. If yes, proceed to the next step; otherwise, return to step 2).

[0051] 4) Open the shut-off valve, and the air volume regulating valve is at its minimum opening. Provide horizontal purging hot air into the arc-shaped furnace top, and at the same time monitor the hot air flow rate in the first hot air pipe through the air volume detector.

[0052] 5) Adjust the air flow regulating valve on the second-stage gas pipe to reduce the air flow in the second-stage gas pipe. The reduction in air flow is equal to the reduction in hot air flow in the first hot air pipe.

[0053] 6) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; if not, return to step 2).

[0054] 7) Gradually increase the opening of the air volume regulating valve and monitor the hot air flow in the first hot air pipe through the air volume detector, while reducing the air flow in the second gas pipe by the same amount.

[0055] 8) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; otherwise, return to step 4).

[0056] 9) Maintain the maximum allowable value of hot air flow in the first hot air duct, while reducing the air flow value in the second gas duct by the same amount;

[0057] 10) Continue ignition until it ends.

[0058] The maximum allowable hot air flow rate in the first hot air duct is 1.6 m³ / h. 3 / minute.

[0059] The present invention relates to an energy-saving anti-nodulation ignition furnace and its ignition control method, which greatly reduces the generation of nodules near the burner of the ignition furnace, reduces the heavy labor of manually cleaning nodules, and also improves the sintering effect of the edge of the sintering fabric, thereby improving the sintering quality of the sintering fabric.

[0060] This invention is not limited to the specific embodiments described above. Any improvements made to the technical solutions by those skilled in the art based on the concept of this invention should fall within the scope of protection claimed by this invention.

Claims

1. An energy-saving anti-caking ignition furnace, comprising an ignition furnace body (1), wherein a plurality of single-stage ignition nozzles (4) are uniformly arranged longitudinally on the top of the left end of the ignition furnace body (1), wherein the single-stage ignition nozzles are connected to a section of gas pipe (8) outside the ignition furnace body (1), characterized in that: The middle part of the ignition furnace body (1) is an arc-shaped furnace top (2). Multiple two-stage ignition nozzles (3) are arranged along the circumference of the arc-shaped furnace top. The two-stage ignition nozzles are connected to two gas pipes (7) outside the ignition furnace body (1). Multiple hot air nozzles (6) are arranged on one side wall of the arc-shaped furnace top (2). The hot air nozzles are connected to the first hot air pipe (5) outside the ignition furnace body. The hot air nozzles provide transverse hot air blowing into the arc-shaped furnace top. The two-stage ignition nozzles (3) are divided into large-diameter ignition nozzles (3-1) and small-diameter ignition nozzles (3-2). The large-diameter ignition nozzles are evenly distributed along the circumference of the arc-shaped furnace top. The small-diameter ignition nozzles are distributed on both sides of the arc-shaped furnace top. The spacing of the large-diameter ignition nozzles (3-1) is greater than the spacing of the small-diameter ignition nozzles (3-2).

2. The energy-saving anti-nodulation ignition furnace according to claim 1, characterized in that: The arc-shaped furnace top (2) has an arc of 15°, and the height h between the top of the inner circumference of the arc-shaped furnace top (2) and the top surface of the ignition furnace body (1) is 30cm.

3. The energy-saving anti-nodulation ignition furnace according to claim 2, characterized in that: A pressure detector (18) is installed at the top of the arc-shaped furnace top (2), and the pressure detector is located on the side near the hot air nozzle (6).

4. The energy-saving anti-nodulation ignition furnace according to claim 3, characterized in that: The end of the first gas pipe (8) is connected to the end of the second gas pipe (7) through a connecting pipe (12).

5. The energy-saving anti-nodulation ignition furnace according to claim 4, characterized in that: The first hot air pipe (5) is equipped with a shut-off valve (13), an air volume regulating valve (14), and an air volume detector (15), and the second gas pipe (7) is equipped with an air flow regulating valve (16).

6. The energy-saving anti-nodulation ignition furnace according to claim 5, characterized in that: An air curtain assembly (11) is provided at the right end of the ignition furnace body (1). The air curtain assembly is connected to the second hot air pipe (9) outside the ignition furnace body (1) through a pipe (10). The air curtain assembly provides a vertical hot air curtain to the interior of the ignition furnace body (1).

7. The energy-saving anti-nodulation ignition furnace according to claim 6, characterized in that: The shut-off valve (13), air volume regulating valve (14), air volume detector (15), pressure detector (18), and air flow regulating valve (16) are all electrically connected to the PLC controller.

8. An ignition control method based on the energy-saving anti-nodulation ignition furnace according to claim 7, characterized in that, The specific steps include the following: 1) Start ignition; 2) Control the ratio of gas to air in the first and second gas pipes, i.e., the gas flow rate / air flow rate is the rated value; 3) Monitor the pressure inside the arc-shaped furnace top using a pressure detector. Check if the pressure is greater than 1.0 kPa. If yes, proceed to the next step; otherwise, return to step 2. 4) Open the shut-off valve, and the air volume regulating valve is at its minimum opening. Provide horizontal purging hot air into the arc-shaped furnace top, and at the same time monitor the hot air flow rate in the first hot air pipe through the air volume detector. 5) Adjust the air flow regulating valve on the second-stage gas pipe to reduce the air flow in the second-stage gas pipe. The reduction in air flow is equal to the reduction in hot air flow in the first hot air pipe. 6) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; if not, return to step 2). 7) Gradually increase the opening of the air volume regulating valve and monitor the hot air flow in the first hot air pipe through the air volume detector, while reducing the air flow in the second gas pipe by the same amount. 8) Observe whether the combustion of the sintering material surface is normal. If yes, proceed to the next step; otherwise, return to step 4). 9) Maintain the maximum allowable hot air flow rate in the first hot air duct, while reducing the air flow rate in the second gas duct by the same amount; 10) Continue ignition until it ends.

9. The ignition control method according to claim 8, characterized in that: The maximum allowable hot air flow rate in the first hot air duct is 1.6 m³ / h. 3 / minute.

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