A regenerative continuous casting tundish baking system

Abstract

The present invention relates to the technical field of baking equipment in iron and steel enterprises, and specifically to a regenerative continuous casting tundish baking system, which includes a first gas pipeline and a second gas pipeline for transporting gas, a first air pipeline and a second air pipeline for transporting air, and a first flue gas pipeline and a second flue gas pipeline for transporting flue gas. The first air regenerator of the regenerative burner module is respectively connected to the first flue gas pipeline and the first air pipeline, the second air regenerator is respectively connected to the second flue gas pipeline and the second air pipeline, the first gas nozzle is connected to the first gas pipeline, and the second gas nozzle is connected to the second gas pipeline. Compared with the existing baking devices that widely use converter gas for direct baking or regenerative technology for baking, this system can not only achieve the effects of high baking temperature and short baking time that can only be achieved by high-calorific-value gas by using medium-calorific-value and low-cost converter gas, but also has a long service life, energy-saving, and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of baking equipment in iron and steel enterprises, and particularly to a regenerative continuous casting tundish baking system. Background Art

[0002] At present, converter gas, as a by-product gas fuel with medium calorific value commonly found within iron and steel enterprises, is widely used in the baking of continuous casting tundishes. The commonly adopted combustion method is direct baking through burners.

[0003] The average low calorific value of converter gas is approximately 1400 KCal / m3 (5850 Kj / m3). When the air and gas are not preheated, the theoretical combustion temperature is approximately around 1600 °C. After being converted according to the furnace temperature coefficient, the actual furnace temperature is approximately around 1100 °C. However, the continuous casting tundish is required to be quickly baked to around 1100 °C (1100 °C is the refractory surface temperature, and the corresponding actual furnace temperature reaches above 1200 °C) within 2 - 3 hours before receiving molten steel.

[0004] Therefore, when directly applying it to the baking of continuous casting tundishes, enterprises with conditions generally add high calorific value gases such as natural gas or coke oven gas as auxiliary heat supply during the later stage of baking. Otherwise, it may result in disadvantages such as low baking temperature, long time, and high energy consumption.

[0005] Regenerative combustion technology has been widely applied to various domestic kilns due to its advantages of being able to achieve high combustion temperature, short time, and high energy-saving efficiency by using low and medium calorific value fuels. However, there are few successful cases of applying this combustion technology to the baking of continuous casting tundishes.

[0006] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present invention is to overcome the problems of the above-mentioned existing technologies, and provide a regenerative continuous casting tundish baking system to solve the disadvantages such as low baking temperature, long time, high energy consumption, uneven baking of converter gas with medium calorific value, as well as technical problems such as short equipment life like fragile regenerators and vulnerable burner bricks, so as to achieve the purpose of energy conservation, consumption reduction, improvement of baking quality, and safe use.

[0008] The above purpose is achieved through the following technical solutions:

[0009] A regenerative continuous casting tundish baking system includes a first gas pipeline and a second gas pipeline for conveying gas, a first air pipeline and a second air pipeline for conveying air, and a first flue gas pipeline and a second flue gas pipeline for conveying flue gas. The first gas pipeline and the second gas pipeline are respectively connected to a gas source. A first gas quick cut-off valve is arranged between the first gas pipeline and the gas source, and a second gas quick cut-off valve is arranged between the second gas pipeline and the gas source. The first air pipeline and the second air pipeline are respectively connected to a gas supply device through an air three-way changeover valve. The first flue gas pipeline and the second flue gas pipeline are respectively connected to an air extraction device through a flue gas three-way changeover valve. The system further includes a plurality of regenerative burner modules. Each regenerative burner module includes a first air regenerative chamber, a second air regenerative chamber, a first gas nozzle and a second gas nozzle. The first gas nozzle is matched with the first air regenerative chamber, and the second gas nozzle is matched with the second air regenerative chamber. The first air regenerative chamber is respectively connected to the first flue gas pipeline and the first air pipeline. The second air regenerative chamber is respectively connected to the second flue gas pipeline and the second air pipeline. The first gas nozzle is connected to the first gas pipeline, and the second gas nozzle is connected to the second gas pipeline.

[0010] Further, a first gas branch pipe is connected to the first gas pipeline, and a second gas branch pipe is connected to the second gas pipeline. The first gas branch pipe and the second gas branch pipe are respectively connected to a gas main pipe, and the gas main pipe is connected to the gas source. A first air branch pipe is connected to the first air pipeline, and a second air branch pipe is connected to the second air pipeline. The first air branch pipe and the second air branch pipe are respectively connected to two interfaces of the air three-way changeover valve, and another interface of the air three-way changeover valve is connected to an air main pipe, and the air main pipe is connected to the gas supply device. A first flue gas branch pipe is connected to the first flue gas pipeline, and a second flue gas branch pipe is connected to the second flue gas pipeline. The first flue gas branch pipe and the second flue gas branch pipe are respectively connected to two interfaces of the flue gas three-way changeover valve, and another interface of the flue gas three-way changeover valve is connected to a flue gas main pipe, and the flue gas main pipe is connected to the air extraction device.

[0011] Further, a third gas branch pipe is connected to the first gas pipeline, and a fourth gas branch pipe is connected to the second gas pipeline. The third gas branch pipe is connected to the first gas nozzle, and the fourth gas branch pipe is connected to the second gas nozzle.

[0012] A third air branch pipe is connected to the first air pipe, a fourth air branch pipe is connected to the second air pipe, a third flue gas branch pipe is connected to the first flue gas pipe, and a fourth flue gas branch pipe is connected to the second flue gas pipe. The third air branch pipe and the third flue gas branch pipe are respectively connected to a first regenerative heat pipe, and the first regenerative heat pipe is connected to the first air regenerative heat chamber; the fourth air branch pipe and the fourth flue gas branch pipe are respectively connected to a second regenerative heat pipe, and the second regenerative heat pipe is connected to the second air regenerative heat chamber.

[0013] Further, the first gas pipe, the second gas pipe, the first air pipe, the second air pipe, the first flue gas pipe, the second flue gas pipe, and several of the regenerative burner modules are supported by brackets; the first gas pipe and the second gas pipe form a lower cross beam, the first air pipe and the second air pipe form a middle cross beam, and the first flue gas pipe and the second flue gas pipe form an upper cross beam; several of the regenerative burner modules are on the same horizontal plane.

[0014] Further, the bracket is connected to a rotary shaft seat through an arm, the rotary shaft seat is installed on a support seat, and a driving device is arranged at the end of the arm for driving the rotation of the arm relative to the rotary shaft seat.

[0015] Further, the driving device includes a hydraulic cylinder, the bottom end of the hydraulic cylinder is fixed to the ground, and the piston rod of the hydraulic cylinder is connected to the end of the arm. By the hydraulic cylinder, the arm can be driven to rotate clockwise or counterclockwise relative to the rotary shaft seat, so as to drive the lifting of the regenerative burner module.

[0016] Further, the driving device is a chain connected to the end of the arm.

[0017] Further, the air supply device is a blower; the air extraction device is an induced draft fan.

[0018] Further, a regulating valve is arranged on the gas main pipe for regulating the flow rate of the input gas.

[0019] Further, the first gas quick cut-off valve, the second gas quick cut-off valve, the air three-way change-over valve, and the flue gas three-way change-over valve are all connected to an electric control system.

[0020] Beneficial effects

[0021] The regenerative continuous casting tundish baking system provided by the present invention avoids the disadvantage of intermittent firing of the regenerative burners at this point by setting two independent regenerative combustion systems, ensuring the uniformity of the tundish baking temperature. This system can be applied to the baking of continuous casting tundishes. Compared with the existing baking devices that widely use direct baking with converter gas (without preheating of air and gas) or baking using regenerative technology, it can not only achieve the effects of high baking temperature and short baking time that can only be achieved by high-calorific value gases (such as coke oven gas and natural gas) by using converter gas with medium calorific value and low cost, but also has a long service life, energy-saving, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic framework diagram of a regenerative continuous casting tundish baking system described in the present invention;

[0023] Figure 2 It is a side view of a regenerative continuous casting tundish baking system described in the present invention;

[0024] Figure 3 It is a top view of a regenerative continuous casting tundish baking system described in the present invention.

[0025] Reference Signs:

[0026] 1 - First gas pipeline, 2 - Second gas pipeline, 3 - Gas main pipeline, 4 - First air pipeline, 5 - Second air pipeline, 6 - Air main pipeline, 7 - First flue gas pipeline, 8 - Second flue gas pipeline, 9 - Flue gas main pipeline, 10 - First gas quick cut-off valve, 11 - Second gas quick cut-off valve, 12 - Air three-way change-over valve, 13 - Gas supply device, 14 - Flue gas three-way change-over valve, 15 - Exhaust device, 16 - Regenerative burner module, 17 - First gas branch pipe, 18 - Third gas branch pipe, 19 - Second gas branch pipe, 20 - Fourth gas branch pipe, 21 - First air branch pipe, 22 - Third air branch pipe, 23 - Second air branch pipe, 24 - Fourth air branch pipe, 25 - First flue gas branch pipe, 26 - Third flue gas branch pipe, 27 - Second flue gas branch pipe, 28 - Fourth flue gas branch pipe, 29 - First air regenerative chamber, 30 - Second air regenerative chamber, 31 - First gas nozzle, 32 - Second gas nozzle, 33 - First regenerative pipe, 34 - Second regenerative pipe, 35 - Bracket, 36 - Support arm, 37 - Rotary shaft seat, 38 - Support seat, 39 - Driving device, 40 - Hydraulic cylinder, 41 - Piston rod, 42 - Chain, 43 - Flow equalizing pipe flowmeter, 44 - Pneumatic control valve, 45 - Manual control valve, 46 - Pneumatic quick cut-off valve, 47 - Manual blind plate valve, 48 - Manual sealed butterfly valve, 49 - Gas joint, 50 - Nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0028] As Figure 1 shown, a regenerative continuous casting tundish baking system includes a first gas pipeline 1 and a second gas pipeline 2 for transporting gas, a first air pipeline 4 and a second air pipeline 5 for transporting air, and a first flue gas pipeline 7 and a second flue gas pipeline 8 for transporting flue gas;

[0029] Among them, the first gas pipeline 1 and the second gas pipeline 2 are respectively connected to a gas source (not marked in the figure, which can be a liquefied gas cylinder). A first gas quick cut-off valve 10 is arranged between the first gas pipeline 1 and the gas source, and a second gas quick cut-off valve 11 is arranged between the second gas pipeline 2 and the gas source;

[0030] The first air pipeline 4 and the second air pipeline 5 are respectively connected to a gas supply device 13 through an air three-way reversing valve 12; the gas supply device 13 is a blower;

[0031] The first flue gas pipeline 7 and the second flue gas pipeline 8 are respectively connected to an air extraction device 15 through a flue gas three-way reversing valve 14; the air extraction device 15 is an induced draft fan;

[0032] Among them, the first gas quick cut-off valve 10, the second gas quick cut-off valve 11, the air three-way reversing valve 12, and the flue gas three-way reversing valve 14 are all connected to an electric control system to achieve automatic control.

[0033] This system further includes a number of regenerative burner modules 16. The regenerative burner module 16 includes a first air regenerator 29, a second air regenerator 30, a first gas nozzle 31, and a second gas nozzle 32. The first gas nozzle 31 is matched with the first air regenerator 29, and the second gas nozzle 32 is matched with the second air regenerator 30; when gas and air are mixed and burned, they are all ejected from the same nozzle 50 on the regenerative burner module 16 as high-temperature flames;

[0034] Among them, the first air regenerator 29 is respectively connected to the first flue gas pipeline 7 and the first air pipeline 4, and the second air regenerator 30 is respectively connected to the second flue gas pipeline 8 and the second air pipeline 5,

[0035] The first gas nozzle 31 is connected to the first gas pipeline 1, and the second gas nozzle 33 is connected to the second gas pipeline 2.

[0036] Working principle:

[0037] The above connection structure provides 2 independent combustion channels for each regenerative burner module 16 in this embodiment. When one provides combustion, the other is used for smoke exhaust. Specifically as follows:

[0038] If the first gas pipeline 1 and the first air pipeline 4 are connected, the second gas pipeline 2, the second air pipeline 5 and the first smoke pipeline 7 are closed, and the second smoke pipeline 8 is connected for smoke exhaust;

[0039] If the second gas pipeline 2 and the second air pipeline 5 are connected, the first gas pipeline 1, the first air pipeline 4 and the second smoke pipeline 8 are closed, and the first smoke pipeline 7 is connected for smoke exhaust;

[0040] The switching between the first air duct 4 and the second air duct 5 is achieved by controlling the air three-way reversing valve 12;

[0041] The switching between the first flue gas duct 7 and the second flue gas duct 8 is achieved by controlling the flue gas three-way reversing valve 14;

[0042] The switching between the first gas pipeline 1 and the second gas pipeline 2 is achieved through the first gas quick-cut valve 10 and the second gas quick-cut valve 11 respectively.

[0043] As an optimization of this embodiment, the first gas pipeline 1 is connected to a first gas branch pipe 17, the second gas pipeline 2 is connected to a second gas branch pipe 19, the first gas branch pipe 17 and the second gas branch pipe 19 are respectively connected to a gas main pipe 3, and the gas main pipe 3 is connected to the gas source (not marked in the figure);

[0044] The first air pipe 4 is connected to a first air branch pipe 21, the second air pipe 5 is connected to a second air branch pipe 23, the first air branch pipe 21 and the second air branch pipe 23 are respectively connected to two interfaces of the air three-way reversing valve 12, the other interface of the air three-way reversing valve 12 is connected to an air main pipe 6, and the air main pipe 6 is connected to the air supply device 13;

[0045] The first smoke pipe 7 is connected to a first smoke branch pipe 25, and the second smoke pipe 8 is connected to a second smoke branch pipe 27. The first smoke branch pipe 25 and the second smoke branch pipe 27 are respectively connected to two interfaces of the smoke three-way reversing valve 14, and the other interface of the smoke three-way reversing valve 14 is connected to the smoke main pipe 9, and the smoke main pipe 9 is connected to the exhaust device 15.

[0046] The first gas pipeline 1 is connected to a third gas branch pipe 18, the second gas pipeline 2 is connected to a fourth gas branch pipe 20, the third gas branch pipe 18 is connected to the first gas nozzle 31, and the fourth gas branch pipe 20 is connected to the second gas nozzle 32;

[0047] A third air branch pipe 22 is connected to the first air pipe 4, a fourth air branch pipe 24 is connected to the second air pipe 5, a third flue gas branch pipe 26 is connected to the first flue gas pipe 7, and a fourth flue gas branch pipe 28 is connected to the second flue gas pipe 8. The third air branch pipe 22 and the third flue gas branch pipe 26 are respectively connected to a first regenerative heat pipe 33, and the first regenerative heat pipe 33 is connected to the first air regenerative heat chamber 29; the fourth air branch pipe 24 and the fourth flue gas branch pipe 28 are respectively connected to a second regenerative heat pipe 34, and the second regenerative heat pipe 34 is connected to the second air regenerative heat chamber 30.

[0048] As Figure 2 and 3 shown, in order to enable the present device to act well on the continuous casting ladle tundish, in this embodiment, the first gas pipe 1, the second gas pipe 2, the first air pipe 4, the second air pipe 5, the first flue gas pipe 7, the second flue gas pipe 8 and several of the regenerative burner modules 16 are supported by a bracket 35; wherein, the first gas pipe 1 and the second gas pipe 2 form a lower cross beam, the first air pipe 4 and the second air pipe 5 form a middle cross beam, and the first flue gas pipe 7 and the second flue gas pipe 8 form an upper cross beam; several of the regenerative burner modules 16 form the same horizontal plane and correspond to the continuous casting ladle tundish.

[0049] In this embodiment, the bracket 35 is connected to a rotary shaft seat 37 through a support arm 36, the rotary shaft seat 37 is installed on a support base 38, and a driving device 39 is arranged at the end of the support arm 36 for driving the rotation of the support arm 36 relative to the rotary shaft seat 37.

[0050] Specifically, the driving device 39 drives the support arm 36 to rotate clockwise or counterclockwise, so as to drive the lifting of the bracket 35, and further drive the lifting of the regenerative burner module 16 relative to the continuous casting ladle tundish.

[0051] In this embodiment, the driving device provides two solutions:

[0052] Solution 1: The driving device 39 includes a hydraulic cylinder 40, the bottom end of the hydraulic cylinder 40 is fixed to the ground (or bottom plate), the piston rod 41 of the hydraulic cylinder 40 is connected to the end of the support arm 36, and the hydraulic cylinder 40 can drive the support arm 36 to rotate clockwise or counterclockwise relative to the rotary shaft seat 37, so as to drive the lifting of the regenerative burner module 16.

[0053] Solution 2: The driving device 39 is a chain connected to the end of the support arm 36, and the lifting of the regenerative burner module 16 can be driven by pulling.

[0054] For the convenience of controlling and monitoring the gas to achieve safe use, a regulating valve is provided on the gas main pipe 3 for adjusting the flow rate of the input gas, including a pneumatic regulating valve 44, a manual regulating valve 45, a pneumatic quick cut-off valve 46, a manual blind plate valve 47, a manual sealing butterfly valve 48, etc. A pitot tube flowmeter 43 for monitoring the flow rate is also provided. A gas connection point 49 is connected to the end of the gas main pipe 3 for connecting to a gas source.

[0055] As mentioned above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by those familiar with the technology within the technical scope disclosed by the present invention are covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope protected by the claims.

Claims

1. A regenerative continuous casting tundish baking system, characterized in that, It includes a first gas pipeline and a second gas pipeline for transporting gas, a first air pipeline and a second air pipeline for transporting air, and a first flue gas pipeline and a second flue gas pipeline for transporting flue gas; The first gas pipeline and the second gas pipeline are respectively connected to a gas source. A first gas quick cut-off valve is provided between the first gas pipeline and the gas source, and a second gas quick cut-off valve is provided between the second gas pipeline and the gas source; The first air pipeline and the second air pipeline are respectively connected to a gas supply device through an air three-way changeover valve; The first flue gas pipeline and the second flue gas pipeline are respectively connected to an air extraction device through a flue gas three-way changeover valve; It further includes a number of regenerative burner modules. The regenerative burner module includes a first air regenerator, a second air regenerator, a first gas nozzle and a second gas nozzle. The first gas nozzle is matched with the first air regenerator, and the second gas nozzle is matched with the second air regenerator; The first air regenerator is respectively connected to the first flue gas pipeline and the first air pipeline, and the second air regenerator is respectively connected to the second flue gas pipeline and the second air pipeline, The first gas nozzle is connected to the first gas pipeline, and the second gas nozzle is connected to the second gas pipeline.

2. The regenerative continuous casting tundish baking system according to claim 1, characterized in that, A first gas branch pipe is connected to the first gas pipeline, and a second gas branch pipe is connected to the second gas pipeline. The first gas branch pipe and the second gas branch pipe are respectively connected to a gas main pipe, and the gas main pipe is connected to the gas source; A first air branch pipe is connected to the first air pipeline, and a second air branch pipe is connected to the second air pipeline. The first air branch pipe and the second air branch pipe are respectively connected to two interfaces of the air three-way changeover valve. Another interface of the air three-way changeover valve is connected to an air main pipe, and the air main pipe is connected to the gas supply device; A first flue gas branch pipe is connected to the first flue gas pipeline, and a second flue gas branch pipe is connected to the second flue gas pipeline. The first flue gas branch pipe and the second flue gas branch pipe are respectively connected to two interfaces of the flue gas three-way changeover valve. Another interface of the flue gas three-way changeover valve is connected to a flue gas main pipe, and the flue gas main pipe is connected to the air extraction device.

3. The regenerative continuous casting tundish baking system according to claim 2, wherein A third gas branch pipe is connected to the first gas pipeline, and a fourth gas branch pipe is connected to the second gas pipeline. The third gas branch pipe is connected to the first gas nozzle, and the fourth gas branch pipe is connected to the second gas nozzle; A third air branch pipe is connected to the first air pipeline, a fourth air branch pipe is connected to the second air pipeline, a third flue gas branch pipe is connected to the first flue gas pipeline, and a fourth flue gas branch pipe is connected to the second flue gas pipeline. The third air branch pipe and the third flue gas branch pipe are respectively connected to a first regenerative heat pipe, and the first regenerative heat pipe is connected to the first air regenerator; The fourth air branch pipe and the fourth flue gas branch pipe are respectively connected to a second regenerative heat pipe, and the second regenerative heat pipe is connected to the second air regenerator.

4. A regenerative continuous casting tundish baking system according to claim 1, characterized in that, The first gas pipeline, the second gas pipeline, the first air pipeline, the second air pipeline, the first flue gas pipeline, the second flue gas pipeline and several of the regenerative burner modules are supported by brackets; the first gas pipeline and the second gas pipeline form a lower cross beam, the first air pipeline and the second air pipeline form a middle cross beam, and the first flue gas pipeline and the second flue gas pipeline form an upper cross beam; several of the regenerative burner modules are on the same horizontal plane.

5. The regenerative continuous casting tundish baking system according to claim 4, characterized in that, The bracket is connected to a rotary shaft seat through a support arm, the rotary shaft seat is installed on a support base, and a driving device is provided at the end of the support arm for driving the rotation of the support arm relative to the rotary shaft seat.

6. The regenerative continuous casting tundish baking system according to claim 5, characterized in that, The driving device includes a hydraulic cylinder, the bottom end of the hydraulic cylinder is fixed to the ground, the piston rod of the hydraulic cylinder is connected to the end of the support arm, and the support arm can be driven to rotate clockwise or counterclockwise relative to the rotary shaft seat through the hydraulic cylinder, so as to drive the lifting of the regenerative burner module.

7. A regenerative continuous casting tundish baking system according to claim 5, characterized in that, The driving device is a chain connected to the end of the support arm.

8. A regenerative continuous casting tundish baking system according to claim 1, characterized in that, The gas supply device is a blower; the gas extraction device is an induced draft fan.

9. A regenerative continuous casting tundish baking system according to claim 2, characterized in that, A regulating valve is provided on the gas main pipe for adjusting the flow rate of the input gas.

10. A regenerative continuous casting tundish baking system according to claim 1, characterized in that, The first gas quick cut-off valve, the second gas quick cut-off valve, the air three-way change-over valve and the flue gas three-way change-over valve are all connected to the electric control system.

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