Ignition mechanism of sintering device and sintering device

Abstract

The invention belongs to the technical field of metallurgical sintering equipment, and provides an ignition mechanism of a sintering device and the sintering device.The ignition mechanism comprises a hearth and a mixing cavity, the mixing cavity communicates with the interior of the hearth through the top of the hearth, and a fuel injection assembly and a first air injection assembly are arranged in the mixing cavity; a flue gas flow channel for introducing hot flue gas of the circular cooler into the mixing cavity is also communicated with the interior of the mixing cavity; and the second air injection assembly comprises a plurality of air outlets formed in the inner wall of the hearth, and the air outlets communicate with air supply equipment. By introducing the hot flue gas of the circular cooler, fuel, air and the hot flue gas of the circular cooler are mixed for preliminary combustion and then are mixed with sufficient air to realize sufficient combustion, and meanwhile, the hot flue gas of the circular cooler is uniformly blown to the surface of a sintering raw material, so that the combustion efficiency in the sintering process is improved, the energy utilization efficiency is improved, and energy conservation and emission reduction are favorably realized.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical sintering equipment, and in particular relates to an ignition mechanism of a sintering device and a sintering device. Background Art

[0002] The sintering process is a key link in the ironmaking process, providing the necessary core raw materials for the ironmaking process. In this process, raw materials such as ore powder, coal and flux are batched and mixed before entering the sintering machine for sintering. The sintering machine has a continuous conveyor belt device. The evenly mixed raw materials are evenly piled on the conveyor belt, and the surface raw materials are ignited by the ignition device at the head of the machine, and the combustion gradually moves downward. In this process, air is sucked into the material bed through the exhaust device at the bottom of the sintering machine to ensure that the raw materials in the material bed can be fully burned.

[0003] The sintering machine needs to use an ignition mechanism for ignition during use. The existing ignition mechanism cannot fully mix the gas and air, which is not conducive to the full combustion of the gas. It also does not have an air drying function. When the air humidity is high, it will not only affect the ignition, but also reduce the combustion efficiency, affecting the operation of the sintering machine. At the same time, the existing sintering device uses the hot flue gas generated by the ring cooler to blow to the surface of the sintering raw materials to significantly improve the energy utilization efficiency of the sintering process. However, the current flue gas flow distribution method of the sintering machine has the problem of uneven airflow distribution. The flow rate of some outlets is too high, which can easily cause the ore particles on the surface of the sintering raw materials to be blown away, affecting the sintering process. Summary of the invention

[0004] The object of the present invention is to provide an ignition mechanism of a sintering device and a sintering device to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solution: an ignition mechanism of a sintering device, comprising:

[0006] furnace,

[0007] A mixing chamber, the mixing chamber is connected to the interior of the furnace through the top of the furnace, a fuel injection assembly and a first air injection assembly are arranged in the mixing chamber, and a flue gas flow passage for introducing hot flue gas of an annular cooler into the mixing chamber is also connected in the mixing chamber;

[0008] The second air injection assembly includes a plurality of air outlets opened on the inner wall of the furnace, and the air outlets are connected to the air supply device.

[0009] Preferably, the top of the furnace is fixedly connected to a flow pipe, the top of the flow pipe is connected to the bottom of the mixing chamber, a burner is connected between the bottom of the flow pipe and the furnace, and the top of the mixing chamber is connected to a flue gas flow duct for introducing hot flue gas from the ring cooler.

[0010] Preferably, the fuel injection assembly comprises a fuel nozzle, the fuel nozzle is fixedly arranged on the side wall of the mixing chamber, and the fuel nozzle is connected to the air supply device through the first air pipe;

[0011] The first air injection assembly includes an air nozzle, and the air nozzle is fixedly disposed on the side wall of the mixing chamber;

[0012] The nozzle direction of the fuel nozzle is the same as that of the air nozzle and both are tangent to the circumferential side wall of the mixing chamber.

[0013] Preferably, the second air injection assembly further comprises an air cavity opened on the side wall of the furnace, the air cavity is connected with the plurality of air outlets, and the air cavity is connected with the air supply device through a second air pipe.

[0014] Preferably, the end of the first air pipe away from the air nozzle and the end of the second air pipe away from the wind cavity are respectively connected to the ventilation pipe, the air supply device is connected to the ventilation pipe, the first air pipe is connected to a first solenoid valve, and the second air pipe is connected to a second solenoid valve.

[0015] A sintering device, comprising:

[0016] A machine body, wherein a movable support plate is arranged in the machine body, and an ignition mechanism of the sintering device is arranged in the machine body;

[0017] A gas collection assembly, comprising a negative pressure air collection member for collecting waste gas after combustion of sintering raw materials, wherein the negative pressure air collection member is connected to an exhaust pipe, and a fume heating member is fixedly sleeved on the exhaust pipe;

[0018] The flue gas supply assembly includes a delivery pipe, which is arranged behind the ignition mechanism along the moving direction of the movable support plate. The hot flue gas from the ring cooler enters the delivery pipe through the flue gas heating element. Several air supply pipes are connected to the side wall of the delivery pipe, and a flow stabilizing element is arranged inside the delivery pipe.

[0019] Preferably, the flow stabilizer includes a plurality of throttle plates, and the throttle plates are fixedly connected to the inner wall of the delivery pipe along the axial direction of the delivery pipe. The throttle plates are located between two adjacent air supply pipes, and the inner diameters of the throttle plates gradually decrease along the direction of smoke flow.

[0020] Preferably, the negative pressure air collecting part includes an air collecting pipe and a plurality of wind boxes, the plurality of wind boxes are arranged below the movable pallet, the air collecting pipe is connected to the bottoms of the plurality of wind boxes, one end of the air collecting pipe is connected to the air inlet of the first fan, and the air outlet of the first fan is connected to the exhaust pipe.

[0021] Preferably, the flue gas heating element includes a heat exchange box fixedly mounted on the exhaust duct, a coil is arranged inside the heat exchange box, the coil is fixedly mounted on the exhaust duct, one end of the coil is introduced into the hot flue gas of the ring cooler through the flue gas inlet pipe, and the other end of the coil is connected to the heat exchange box through the flue gas outlet pipe.

[0022] Preferably, the flue gas flow passage passes through the side wall of the flue gas outlet pipe and is connected with the interior of the flue gas outlet pipe.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] 1. The present invention premixes fuel and air by setting a mixing chamber, and introduces hot flue gas from an annular cooler to heat the fuel and reduce the effect of air humidity on combustion. At the same time, a large amount of air is introduced into the furnace to allow the fuel to fully burn on the surface of the sintering raw materials, thereby improving the sintering efficiency.

[0025] 2. The sintering device of the present invention makes full use of the heat of the flue gas after sintering, which is beneficial to improving the combustion efficiency of the ignition mechanism and the sintering process. At the same time, by setting a flow stabilizer, the air flow in each air supply pipe is made close, avoiding the influence of air supply difference on the combustion of sintering raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic diagram of the ignition mechanism of the present invention;

[0028] Figure 2 is a schematic diagram of a sintering device of the present invention;

[0029] Figure 3 is a cross-sectional view of a heat exchange box of the present invention;

[0030] Figure 4 It is a cross-sectional view of the delivery pipe and the air supply pipe of the present invention;

[0031] Among them, 1. body; 2. movable support plate; 3. bellows; 4. air collecting pipe; 5. first fan; 6. exhaust pipe; 7. heat exchange box; 8. flue gas inlet pipe; 9. flue gas outlet pipe; 10. furnace; 11. mixing chamber; 12. circulation pipe; 13. fuel pipe; 14. second fan; 15. ventilation pipe; 16. third fan; 17. delivery pipe; 18. air supply pipe; 19. coil; 20. burner; 21. fuel nozzle; 22. air nozzle; 23. first air pipe; 24. first solenoid valve; 25. second solenoid valve; 26. second air pipe; 27. wind chamber; 28. air outlet; 29. ​​throttle plate; 30. flue gas flow channel. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figure 1 The present invention provides an ignition mechanism for a sintering device, comprising:

[0035] Furnace 10,

[0036] A mixing chamber 11, the mixing chamber 11 is connected to the interior of the furnace 10 through the top of the furnace 10, a fuel injection assembly and a first air injection assembly are arranged in the mixing chamber 11, and a flue gas flow passage 30 for introducing hot flue gas of the annular cooler into the mixing chamber 11 is also connected in the mixing chamber 11;

[0037] The second air injection assembly includes a plurality of air outlets 28 opened on the inner wall of the furnace 10, and the air outlets 28 are connected to the air supply device.

[0038] The main function of the first air injection assembly is to inject a small amount of air into the mixing chamber 11; the main function of the second air injection assembly is to inject a large amount of air into the furnace 10; the main function of the mixing chamber 11 is to mix the hot flue gas of the annular cooler with the fuel and a small amount of air to heat the fuel and air, avoid the combustion problem caused by high air humidity, and pre-mix the fuel and air; the main function of the air outlet 28 is to inject a large amount of air into the furnace 10, so that the fuel can be fully burned between the furnace and the sintering raw materials and the high temperature in the furnace can be used to avoid the influence of air humidity on combustion. On the whole, the present invention pre-mixes the fuel and the air by setting a mixing chamber, and at the same time, by introducing the hot flue gas of the annular cooler, the fuel is heated and the influence of air humidity on combustion is reduced. At the same time, by introducing a large amount of air into the furnace, the fuel is fully burned on the surface of the sintering raw materials, thereby improving the sintering efficiency.

[0039] A further optimized solution is that a flow pipe 12 is fixedly connected to the top of the furnace 10, the top of the flow pipe 12 is connected to the bottom of the mixing chamber 11, a burner 20 is connected between the bottom of the flow pipe 12 and the furnace 10, and the top of the mixing chamber 11 is connected to a flue gas flow duct 30 for introducing hot flue gas from the annular cooler.

[0040] like Figure 1 As shown, an electric ignition rod is provided in the burner 20 to achieve automatic ignition.

[0041] According to a further optimized solution, the fuel injection assembly includes a fuel nozzle 21, which is fixedly disposed on the side wall of the mixing chamber 11, and the fuel nozzle 21 is connected to the air supply device through a first air pipe 23;

[0042] The first air injection assembly includes an air nozzle 22, and the air nozzle 22 is fixedly disposed on the side wall of the mixing chamber 11;

[0043] The nozzle direction of the fuel nozzle 21 is the same as that of the air nozzle 22 and both are tangent to the circumferential side wall of the mixing chamber 11 .

[0044] like Figure 1 As shown, by setting the injection direction of the fuel nozzle 21 and the air nozzle 22 to be tangential to the side wall of the mixing chamber 11, the fuel and air can rotate in the mixing chamber 11 to improve the mixing effect. Afterwards, the hot flue gas flowing into the flue gas flow channel 30 is mixed with the formed rotating airflow in the mixing chamber 11 to form a mixed gas and flows toward the burner 20 through the flow pipe 12.

[0045] According to a further optimization solution, the fuel nozzle 21 is connected to the fuel supply device via the fuel pipe 13 .

[0046] As a further optimization scheme, the second air injection assembly also includes an air cavity 27 opened on the side wall of the furnace 10 , the air cavity 27 is connected to a plurality of air outlets 28 , and the air cavity 27 is connected to the air supply device through a second air pipe 26 .

[0047] To further optimize the solution, one end of the first air pipe 23 away from the air nozzle 22 and one end of the second air pipe 26 away from the wind chamber 27 are respectively connected to the ventilation pipe 15, the air supply device is connected to the ventilation pipe 15, the first air pipe 23 is connected to the first solenoid valve 24, and the second air pipe 26 is connected to the second solenoid valve 25.

[0048] like Figure 1 As shown, the air supply device delivers air to the first air pipe 23 and the second air pipe 26 through the suction of the third fan 16 and the ventilation pipe 15 at the same time, and controls the opening of the first solenoid valve 24 and the second solenoid valve 25 to control the amount of air flowing into the first air pipe 23 and the second air pipe 26, thereby controlling the air entering the mixing chamber 11 to be less than the air entering the furnace 10, so that the fuel can be fully burned in the furnace 10 and the raw materials can be ignited and burned.

[0049] Reference Figure 1-Figure 4 The present invention also provides a sintering device, comprising:

[0050] A machine body 1, in which a movable support plate 2 is arranged, and in which an ignition mechanism of the sintering device provided in the above embodiment is arranged;

[0051] The gas collecting assembly includes a negative pressure air collecting member for collecting waste gas after combustion of sintering raw materials, the negative pressure air collecting member is connected to the exhaust pipe 6, and a fume heating member is fixedly sleeved on the exhaust pipe 6;

[0052] The flue gas supply assembly includes a delivery pipe 17, which is arranged behind the ignition mechanism along the moving direction of the movable support plate 2. The hot flue gas from the annular cooler enters the delivery pipe 17 through the flue gas heating element. The side wall of the delivery pipe 17 is connected to a plurality of air supply pipes 18, and a flow stabilizing element is arranged inside the delivery pipe 17.

[0053] The main function of the gas heating element is to use the heat of the flue gas after sintering to further heat the hot flue gas of the ring cooler, thereby improving the combustion efficiency of the ignition mechanism and the original sintering process; the main function of the negative pressure air collecting element is to extract the flue gas generated by sintering by creating negative pressure, and at the same time use the formed negative pressure to introduce the hot flue gas of the ring cooler to the surface of the sintering raw materials; the main function of the air supply pipe 18 is to blow the hot flue gas of the ring cooler evenly to the surface of the sintering raw materials, and the main function of the flow stabilizer is to adjust the air flow pressure in the conveying pipe 17 and reduce the flow difference between several air supply pipes 18. On the whole, the sintering device of the present invention makes full use of the heat of the flue gas after sintering, so that the hot flue gas of the ring cooler can be heated up twice, which is beneficial to improving the combustion efficiency of the ignition mechanism and the sintering process. At the same time, by setting the flow stabilizer, the air flow in each air supply pipe is close, avoiding the influence of air supply difference on the combustion of sintering raw materials.

[0054] A further optimized solution is that the flow stabilizer includes a plurality of throttle plates 29, and a plurality of throttle plates 29 are fixedly connected to the inner wall of the delivery pipe 17 along the axial direction of the delivery pipe 17, and the throttle plates are located between two adjacent air supply pipes 18. Along the flow direction of the flue gas, the inner diameters of the plurality of throttle plates 29 gradually decrease.

[0055] like Figure 4 As shown, in this embodiment, the hot flue gas of the annular cooler enters from the left end of the delivery pipe 17. The delivery pipe 17 is connected to eight groups of air supply pipes 18, and four groups of throttle plates 29 are arranged in the delivery pipe 17;

[0056] Specifically, the delivery pipe 17 is 5700mm long and has an inner diameter of 800mm, the inner diameter of the air supply pipe 18 is 300mm, and the distance between two adjacent air supply pipes 18 is 950mm. The diameter of the throttle plate A hole is 744mm, the center point of the baffle is 475mm from the inlet, and the width is 10mm;

[0057] (2) The diameter of the throttle plate B hole is 730 mm, the center point of the baffle is placed 1425 mm from the inlet, and the width is 10 mm;

[0058] (3) The diameter of the throttle plate C hole is 680 mm, the center point of the baffle is placed 2375 mm from the inlet, and the width is 10 mm;

[0059] (4) The diameter of the throttle plate D hole is 724 mm, the center point of the baffle is placed 3325 mm from the inlet, and the width is 10 mm.

[0060] After the above settings, the flow rates in each air supply pipe 18 are 2.75, 2.78, 2.76, 2.82 and 2.87 kg / s, respectively, and the variance between each flow rate is 0.00212. If the throttle plate 29 is not set, the maximum flow rate between each air supply pipe 18 is 2.94 kg / s, and the minimum flow rate is 2.54 kg / s, which is quite different from the average flow rate of 2.8 kg / s when uniformly distributed, and the variance of each flow data value is 0.02758. Compared with the structure without the throttle plate 29, the variance between each flow rate of the scheme of the present application is significantly reduced.

[0061] A further optimized solution is that the negative pressure air collecting component includes an air collecting pipe 4 and a plurality of wind boxes 3. The plurality of wind boxes 3 are arranged below the movable pallet 2. The air collecting pipe 4 is connected to the bottom of the plurality of wind boxes 3. One end of the air collecting pipe 4 is connected to the air inlet of the first fan 5. The air outlet of the first fan 5 is connected to the exhaust pipe 6.

[0062] like Figure 1 As shown, negative pressure is created in the wind box 3 by the first fan 5, so that the flue gas generated by the combustion of the sintering raw materials enters the wind box 3 and enters the exhaust pipe 6 through the air collecting pipe 4, and the heat of the flue gas is used in the exhaust pipe 6 to further heat the hot flue gas of the ring cooler.

[0063] A further optimized solution is that the flue gas heating element includes a heat exchange box 7 fixedly mounted on the exhaust duct 6, a coil 19 is arranged inside the heat exchange box 7, the coil 19 is fixedly mounted on the exhaust duct 6, one end of the coil 19 is introduced into the hot flue gas of the ring cooler through the flue gas inlet pipe 8, and the other end of the coil 19 is connected to the heat exchange box 7 through the flue gas outlet pipe 9.

[0064] like Figure 3 As shown, the main function of the coil 19 is to prolong the contact time between the hot flue gas of the annular cooler and the exhaust pipe 6 and improve the heat exchange efficiency.

[0065] According to a further optimized solution, the flue gas flow channel 30 passes through the side wall of the flue gas outlet pipe 9 and is connected with the interior of the flue gas outlet pipe 9 .

[0066] like Figure 1 As shown, the flue gas flow passage 30 is connected to the second fan 14. During operation, an appropriate amount of hot flue gas from the annular cooler is drawn into the mixing chamber 11 by controlling the operating power of the second fan 14.

[0067] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0068] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An ignition mechanism for a sintering device, characterized in that: include: A furnace (10), a mixing chamber (11), the mixing chamber (11) being in communication with the interior of the furnace (10) through the top of the furnace (10), the mixing chamber (11) being provided with a fuel injection assembly and a first air injection assembly, the mixing chamber (11) also being in communication with a flue gas flow passage (30) for introducing hot flue gas of an annular cooler into the mixing chamber (11); The second air injection assembly comprises a plurality of air outlets (28) opened on the inner wall of the furnace (10), and the air outlets (28) are connected to the air supply device.

2. The ignition mechanism of a sintering device according to claim 1, characterized in that: The top of the furnace (10) is fixedly connected to a flow pipe (12), the top of the flow pipe (12) is connected to the bottom of the mixing chamber (11), a burner (20) is connected between the bottom of the flow pipe (12) and the furnace (10), and the top of the mixing chamber (11) is connected to a flue gas flow duct (30) for introducing hot flue gas from an annular cooler.

3. The ignition mechanism of a sintering device according to claim 1, characterized in that: The fuel injection assembly comprises a fuel nozzle (21), the fuel nozzle (21) is fixedly arranged on the side wall of the mixing chamber (11), and the fuel nozzle (21) is connected to the air supply device through a first air pipe (23); The first air injection assembly comprises an air nozzle (22), and the air nozzle (22) is fixedly disposed on a side wall of the mixing chamber (11); The nozzle direction of the fuel nozzle (21) is the same as the nozzle direction of the air nozzle (22), and both are tangent to the circumferential side wall of the mixing chamber (11).

4. The ignition mechanism of a sintering device according to claim 3, characterized in that: The second air injection assembly also includes an air cavity (27) opened on the side wall of the furnace (10), the air cavity (27) is connected to the plurality of air outlets (28), and the air cavity (27) is connected to the air supply device through a second air pipe (26).

5. The ignition mechanism of a sintering device according to claim 4, characterized in that: One end of the first air pipe (23) away from the air nozzle (22) and one end of the second air pipe (26) away from the wind chamber (27) are respectively connected to the ventilation pipe (15), the air supply device is connected to the ventilation pipe (15), the first air pipe (23) is connected to a first solenoid valve (24), and the second air pipe (26) is connected to a second solenoid valve (25).

6. A sintering device, characterized in that: include: A machine body (1), wherein a movable support plate (2) is arranged in the machine body (1), and an ignition mechanism of the sintering device according to any one of claims 1 to 5 is arranged in the machine body (1); The gas collection assembly comprises a negative pressure air collection component for collecting waste gas after combustion of sintering raw materials, the negative pressure air collection component is connected to an exhaust pipe (6), and a fume heating component is fixedly sleeved on the exhaust pipe (6); The flue gas supply component comprises a delivery pipe (17). The delivery pipe (17) is arranged behind the ignition mechanism along the moving direction of the movable support plate (2). The hot flue gas of the ring cooler enters the delivery pipe (17) through the flue gas heating element. The side wall of the delivery pipe (17) is connected to a plurality of air supply pipes (18). A flow stabilizing element is arranged inside the delivery pipe (17).

7. A sintering device according to claim 6, characterized in that: The flow stabilizing member comprises a plurality of throttle plates (29), and the plurality of throttle plates (29) are fixedly connected to the inner wall of the delivery pipe (17) along the axial direction of the delivery pipe (17), and the throttle plates are located between two adjacent air supply pipes (18). Along the flow direction of the smoke, the inner diameters of the plurality of throttle plates (29) gradually decrease.

8. A sintering device according to claim 6, characterized in that: The negative pressure air collecting component comprises an air collecting pipe (4) and a plurality of wind boxes (3), wherein the plurality of wind boxes (3) are arranged below the movable support plate (2), the air collecting pipe (4) is connected to the bottom of the plurality of wind boxes (3), one end of the air collecting pipe (4) is connected to the air inlet of the first fan (5), and the air outlet of the first fan (5) is connected to the exhaust pipe (6).

9. A sintering device according to claim 6, characterized in that: The flue gas heating element comprises a heat exchange box (7) fixedly mounted on the exhaust duct (6), a coil (19) being arranged inside the heat exchange box (7), the coil (19) being fixedly mounted on the exhaust duct (6), one end of the coil (19) introducing hot flue gas from the ring cooler through a flue gas inlet pipe (8), and the other end of the coil (19) being connected to the heat exchange box (7) through a flue gas outlet pipe (9).

10. A sintering device according to claim 9, characterized in that: The flue gas flow channel (30) passes through the side wall of the flue gas outlet pipe (9) and is in communication with the interior of the flue gas outlet pipe (9).

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