Heat accumulating type natural gas ladle baking device

Abstract

The invention relates to the field of ladle baking devices, in particular to a heat accumulating type natural gas ladle baking device which comprises a steel ladle heating furnace and further comprises a ladle baking cover, the front end of the steel ladle heating furnace is fixedly connected with the ladle baking cover, reinforcing rods are fixedly installed at the left end and the right end of the ladle baking cover, and an installation frame is arranged at the rear end of the steel ladle heating furnace. A hydraulic lifting platform is arranged at the lower end of the steel ladle heating furnace, the two mounting frames are located on the left side and the right side of the steel ladle heating furnace, a heat preservation block is fixedly mounted at the upper end of the ladle baking cover, and a temperature measuring sensor is arranged at the upper end of the heat preservation block. After natural gas and combustion-supporting air are mixed, the high temperature is kept, heat needed by combustion is reduced, energy consumption is reduced, switching between the two heat storage cavities is achieved through the multiple control valves, the controller is matched for control, exchange type heat storage and combustion are achieved, the waste heat recovery effect is improved, meanwhile, the heating effect on the combustion-supporting air is guaranteed, and the energy consumption is reduced. The pouring construction time is prolonged, and the practicability is improved.

Description

Technical Field

[0001] The present invention relates to the field of ladle heaters, and particularly to a regenerative natural gas ladle heater. Background Art

[0002] A ladle heater refers to a device used to bake a ladle after it is newly lined and before it is filled with molten steel. A molten steel ladle or an aluminum liquid ladle is a storage and transportation device for high-temperature liquid metal. For some molten steel with a relatively high required temperature, the lining of the molten steel ladle is used at a temperature of 1500 - 1600°C, and the lining of the aluminum liquid ladle is used at a temperature of 650 - 700°C. Before use, both the molten steel ladle and the aluminum liquid ladle need to be heated. Otherwise, the molten steel or aluminum liquid will rapidly cool down when entering the ladle, which will lead to a decline in production quality. Therefore, during the transportation process, generally, a ladle heater is used to heat the ladle to keep the molten metal at a certain temperature. The conventional ladle heater is mostly heated to below 1100 degrees. Most of the existing natural gas ladle heaters can only bake the ladle lining to about 1100°C. The recovery efficiency of waste heat is poor, resulting in the loss and waste of heat, increasing the energy consumption cost. At the same time, after the tail gas is recovered, it is generally directly discharged beside the equipment, leading to the problem of rising ambient temperature.

[0003] Therefore, aiming at the problems of the existing natural gas ladle heaters with poor waste heat recovery efficiency, increasing energy consumption cost, and limited heating temperature, resulting in a short casting construction time, a regenerative natural gas ladle heater can be designed to facilitate the recovery of waste heat, realize heat storage and energy storage, reduce the heat demand for its own combustion before combustion, reduce energy consumption, and improve practicability. Summary of the Invention

[0004] In order to overcome the problems of the existing natural gas ladle heaters with poor waste heat recovery efficiency, increasing energy consumption cost, and limited heating temperature, resulting in a short casting construction time.

[0005] The technical solution of the present invention is: a regenerative natural gas ladle heater, including a molten steel ladle heating furnace, and further including a baking cover. The front end of the molten steel ladle heating furnace is fixedly connected to the baking cover. Reinforcing rods are fixedly installed at both the left and right ends of the baking cover. An installation frame is arranged at the rear end of the molten steel ladle heating furnace. A hydraulic lifting platform is arranged at the lower end of the molten steel ladle heating furnace. There are two installation frames arranged on the left and right sides of the molten steel ladle heating furnace. A blower and an induced draft fan are respectively fixedly installed at the upper ends of the two installation frames through brackets. A heat preservation block is fixedly installed at the upper end of the baking cover. A temperature measuring sensor is arranged at the upper end of the heat preservation block. An ignition port is arranged on the lower end surface of the baking cover. A gas-assisted burner is arranged inside the ignition port. A mixing channel is arranged inside the baking cover, and the mixing channel is communicated with the ignition port. On both sides inside the ladle heating furnace, a first regenerative chamber and a second regenerative chamber are respectively arranged. An insulating chamber is arranged between the first regenerative chamber and the second regenerative chamber inside the ladle heating furnace. Ceramic regenerative balls are arranged in both the first regenerative chamber and the second regenerative chamber. During operation, an induced draft fan is used for exhaust to collect the heat energy of the tail gas and discharge the tail gas. A blast fan sends high-temperature combustion-supporting air, which is mixed with natural gas in proportion and burned. The combustion-supporting air is heated through the regenerative chamber, reducing the heat required for combustion and energy consumption. After the combustion-supporting air and natural gas fuel are mixed, the combustion-supporting air and natural gas at the ignition port are ignited by a gas-assisted burner to form a direct flame to heat the ladle lining.

[0006] Preferably, there are two mixing channels, and the two mixing channels are respectively connected to the first regenerative chamber and the second regenerative chamber. The end of the reinforcing rod away from the ladle cover is fixedly connected to the ladle heating furnace. The two mixing channels work corresponding to two ignition ports to achieve switching work. At the same time, they are respectively connected to the first regenerative chamber and the second regenerative chamber. One regenerative chamber heats the combustion-supporting air, and the other regenerative chamber recovers and stores the heat of the tail gas, ensuring the heat storage effect.

[0007] Preferably, lifting lugs are arranged on the side of the upper end of the ladle heating furnace. Through holes are opened on the surface of the lifting lugs. There are four lifting lugs. A natural gas pipe is fixedly installed at the upper end of the ladle heating furnace. There are two natural gas pipes. The ends of the two natural gas pipes are connected through a three-way valve. A natural gas inlet hose is arranged on the three-way valve. External natural gas fuel is sent in through the natural gas inlet hose and is controlled and switched through the three-way valve, and the natural gas can be sent into the corresponding mixing channel.

[0008] Preferably, intake pipes are installed at one end of both the blast fan and the induced draft fan. The other end of the blast fan is connected to the bottom of the first regenerative chamber through a pipeline. The other end of the induced draft fan is connected to the bottom of the second regenerative chamber through a pipeline. The blast fan sends combustion-supporting air, while the induced draft fan exhausts, and the combustion tail gas enters the regenerative chamber for heat recovery. When the ignition port is switched, the blast fan and the induced draft fan are switched synchronously, facilitating the exchange work.

[0009] Preferably, the same mixing channels are opened inside the heat preservation block. The two mixing channels are respectively connected to the first regenerative chamber and the second regenerative chamber. Control valves are arranged in the mixing channels. The temperature measurement sensor is a thermocouple. There are two temperature measurement sensors. The lower ends of the temperature measurement sensors extend to the inside of the mixing channels. Natural gas fuel and combustion-supporting air are sent into the mixing channels synchronously to facilitate the mixing of air and fuel, and the temperature of the combustion-supporting air is sensed through the temperature measurement sensor. When the input temperature is relatively low, the equipment can be controlled to switch through the controller.

[0010] Preferably, the hydraulic lifting platform is composed of an upper supporting plate and a lower fixing frame. The upper end of the upper supporting plate is fixedly connected to the lower end of the ladle heating furnace. The lower fixing frame and the upper supporting plate are movably connected through a scissor-type support frame. A hydraulic cylinder is arranged between the scissor-type support frame and the upper supporting plate. Using the hydraulic cylinder as a power source, the upper supporting plate is lifted and moved, facilitating the adjustment of the height of the overall burner, so that the burner cover can be closed on the ladle.

[0011] Preferably, the ladle heating furnace is composed of a fixed bottom plate and a fixed top plate. The fixed bottom plate and the fixed top plate are fixedly connected through a frame plate. Side plates are arranged on the side of the frame plate between the fixed bottom plate and the fixed top plate. A refractory wall is arranged inside the ladle heating furnace. A thermal insulation layer is arranged between the ladle heating furnace and the refractory wall. The thermal insulation layer is used to increase the heat preservation performance, thereby reducing the heat loss in the heat storage cavity, and the refractory wall is used as the inner wall, thus ensuring the refractory performance and avoiding the high temperature in the heat storage cavity from affecting the stability of the thermal insulation layer.

[0012] Preferably, the refractory wall is made of heat-insulating refractory bricks and is adapted to the first heat storage cavity and the second heat storage cavity. The heat preservation blocks are made of refractory bricks to increase the refractory and heat-insulating effect.

[0013] Advantages of the present invention: For this regenerative natural gas burner, an induced draft fan is used for exhausting air, collecting the waste gas heat and discharging the waste gas. A blower sends high-temperature combustion-supporting air, which is mixed with natural gas in proportion for combustion. Through the structures of the first heat storage cavity and the second heat storage cavity, two ignition ports are adapted. During operation, one ignition port conducts combustion heating, while the other ignition port collects the waste gas heat and enters one of the heat storage cavities to heat the incoming combustion-supporting air. Thus, after the natural gas and the combustion-supporting air are mixed, they maintain a relatively high temperature, reducing the heat required for combustion, lowering energy consumption, and realizing the switching between the two heat storage cavities through multiple control valves, adapting to the controller for control, achieving exchangeable heat storage and combustion, increasing the recovery effect of waste heat, while ensuring the heating effect on the combustion-supporting air, increasing the pouring construction time, and improving the practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] [[ID=??]] Figure 1 Shown is the schematic diagram of the overall structure of the regenerative natural gas burner of the present invention Figure 1 ; Figure 2 Shown is the schematic diagram of the overall structure of the regenerative natural gas burner of the present invention Figure 2 ; Figure 3 Shown is the schematic diagram of the internal structure of the heat storage cavity of the regenerative natural gas burner of the present invention; Figure 4 Shown is the schematic diagram of the side cross-sectional structure of the regenerative natural gas burner of the present invention; It should be noted that there seems to be an issue with the tag in the original text where the tag value is missing in the English translation. It should be filled in according to the actual content in the original text. Also, the tag [[ID=??]] in the English translation is a placeholder for the missing tag value in the original text.Figure 5 The figure shows a schematic cross-sectional structure diagram of a molten steel ladle heating furnace of a regenerative natural gas ladle baking furnace according to the present invention.

[0015] Description of reference numerals: 1, molten steel ladle heating furnace; 101, fixed bottom plate; 102, fixed top plate; 103, frame plate; 104, side plate; 105, refractory wall; 2, baking cover; 201, mixing channel; 3, reinforcing rod; 4, mounting frame; 401, upper supporting plate; 402, lower fixing frame; 403, scissor support frame; 5, blower; 6, induced draft fan; 7, heat preservation block; 8, temperature measuring sensor; 9, ignition port; 10, heat insulation cavity; 11, first regenerative cavity; 12, second regenerative cavity; 15, lifting lug plate; 16, natural gas pipe. Specific embodiments

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Embodiment 1

[0018] Please refer to Figures 1-5 , the present invention provides an embodiment: a regenerative natural gas ladle baking furnace, including a molten steel ladle heating furnace 1, and further including a baking cover 2. The front end of the molten steel ladle heating furnace 1 is fixedly connected to the baking cover 2. Reinforcing rods 3 are fixedly installed at both the left and right ends of the baking cover 2. An installation frame 4 is provided at the rear end of the molten steel ladle heating furnace 1. A hydraulic lifting platform is provided at the lower end of the molten steel ladle heating furnace 1. Two installation frames 4 are provided on the left and right sides of the molten steel ladle heating furnace 1. A blower 5 and an induced draft fan 6 are fixedly installed at the upper ends of the two installation frames 4 through brackets respectively. A heat preservation block 7 is fixedly installed at the upper end of the baking cover 2. A temperature measuring sensor 8 is provided at the upper end of the heat preservation block 7. An ignition port 9 is provided on the lower end surface of the baking cover 2. A gas-assisted burner is provided inside the ignition port 9. A mixing channel 201 is provided inside the baking cover 2, and the mixing channel 201 is communicated with the ignition port 9; A first regenerative cavity 11 and a second regenerative cavity 12 are respectively provided on both sides inside the molten steel ladle heating furnace 1. A heat insulation cavity 10 is provided inside the molten steel ladle heating furnace 1 between the first regenerative cavity 11 and the second regenerative cavity 12. Ceramic regenerative balls are provided in both the first regenerative cavity 11 and the second regenerative cavity 12.

[0019] During operation, the induced draft fan 6 is used for exhausting air, collecting the heat energy of the tail gas and discharging the tail gas. The blower 5 sends in high-temperature combustion-supporting air, which is mixed and burned with natural gas in proportion, and the combustion-supporting air is heated through the regenerative cavity, reducing the heat required for combustion and reducing energy consumption. After the combustion-supporting air and natural gas fuel are mixed, the gas-assisted burner ignites the combustion-supporting air and natural gas at the ignition port 9 to form a direct flame to heat the inner lining of the ladle.

[0020] Please refer to Figure 1 and Figure 2, in this embodiment, lifting lugs 15 are arranged on the side of the upper end of the ladle heating furnace 1. Through holes are formed on the surfaces of the lifting lugs 15. There are four lifting lugs 15. A natural gas pipe 16 is fixedly installed at the upper end of the ladle heating furnace 1. There are two natural gas pipes 16. The ends of the two natural gas pipes 16 are connected through a three-way valve, and a natural gas inlet hose is arranged on the three-way valve.

[0021] In this embodiment: The external natural gas fuel is sent in through the natural gas inlet hose and is controlled and switched through the three-way valve, so that the natural gas can be sent into the corresponding mixing channel 201, facilitating the switching control between the two ignition ports 9.

[0022] Please refer to Figure 2 , in this embodiment, inlet pipes are installed at one ends of both the blower 5 and the induced draft fan 6. The other end of the blower 5 is connected to the bottom of the first regenerative chamber 11 through a pipeline, and the other end of the induced draft fan 6 is connected to the bottom of the second regenerative chamber 12 through a pipeline.

[0023] In this embodiment: The blower 5 sends in combustion-supporting air, while the induced draft fan 6 exhausts air, enabling the combustion exhaust gas to enter the regenerative chamber for heat recovery. When the ignition ports 9 are switched, the blower 5 and the induced draft fan 6 are switched synchronously, facilitating the exchange-type operation.

[0024] Embodiment 2

[0025] Please refer to Figure 3 , on the basis of Embodiment 1, this application provides a technical solution: The same mixing channels 201 are formed inside the heat preservation blocks 7. The two mixing channels 201 are respectively connected to the first regenerative chamber 11 and the second regenerative chamber 12, and control valves are arranged in the mixing channels 201. The temperature measuring sensor 8 is a thermocouple. There are two temperature measuring sensors 8. The lower ends of the temperature measuring sensors 8 extend to the inside of the mixing channels 201. The natural gas fuel and the combustion-supporting air are sent into the mixing channels 201 synchronously, facilitating the mixing of air and fuel, and the temperature of the combustion-supporting air is sensed through the temperature measuring sensors 8. When the input temperature is relatively low, the equipment can be controlled by the controller to switch.

[0026] Please refer to 1 and Figure 2 , in this embodiment, the hydraulic lifting platform is composed of an upper support plate 401 and a lower fixing frame 402. The upper end of the upper support plate 401 is fixedly connected to the lower end of the ladle heating furnace 1. The lower fixing frame 402 is movably connected to the upper support plate 401 through a scissor-type support frame 403, and a hydraulic cylinder is arranged between the scissor-type support frame 403 and the upper support plate 401.

[0027] In this embodiment: Using the hydraulic cylinder as the power source, the upper support plate 401 is lifted and moved, facilitating the adjustment of the height of the overall burner, so that the burner cover 2 can be closed on the ladle.

[0028] Embodiment 3

[0029] Please refer to Figure 3 On the basis of Embodiment 1, the ladle heating furnace 1 is composed of a fixed bottom plate 101 and a fixed top plate 102. The fixed bottom plate 101 and the fixed top plate 102 are fixedly connected through a frame plate 103. Side plates 104 are arranged on the side of the frame plate 103 between the fixed bottom plate 101 and the fixed top plate 102. A refractory wall 105 is arranged inside the ladle heating furnace 1, and a heat preservation and insulation layer is arranged between the ladle heating furnace 1 and the refractory wall 105.

[0030] Please refer to Figure 3 and Figure 4 、 Figure 5 In this embodiment, the refractory wall 105 is made of heat-insulating refractory bricks and is adapted to the regenerative chamber one 11 and the regenerative chamber two 12. The heat preservation blocks 7 are made of refractory bricks, increasing the refractory and heat-insulating effect.

[0031] In this embodiment: The heat preservation and insulation layer is used to increase the heat preservation performance, thereby reducing the heat loss in the regenerative chamber, and the refractory wall 105 is used as the inner wall, thereby ensuring the refractory performance and avoiding the high temperature in the regenerative chamber from affecting the stability of the heat preservation and insulation layer.

[0032] During operation, the induced draft fan 6 is used for exhaust, collecting the waste gas heat energy and discharging the waste gas. The blower 5 sends in high-temperature combustion-supporting air, and the natural gas fuel is mixed and burned in proportion. Through the structures of the regenerative chamber one 11 and the regenerative chamber two 12, two ignition ports 9 are adapted. During operation, one ignition port 9 conducts combustion heating, while the other ignition port 9 collects the waste gas heat and enters one side of the regenerative chamber to heat the incoming combustion-supporting air. Thus, after the natural gas and the combustion-supporting air are mixed, they maintain a relatively high temperature, reducing the heat required for combustion, lowering the energy consumption, and realizing the switching between the two regenerative chambers through multiple control valves, adapting to the controller for control, realizing the exchange-type heat storage and combustion, increasing the recovery effect of the waste heat, while ensuring the heating effect on the combustion-supporting air, increasing the pouring construction time, and improving the practicability.

[0033] Through the above steps, the induced draft fan 6 is used for exhaust, collecting the waste gas heat energy and discharging the waste gas. The blower 5 sends in high-temperature combustion-supporting air, which is mixed and burned in proportion with the natural gas, and the combustion-supporting air is heated through the regenerative chamber, reducing the heat required for combustion and lowering the energy consumption. After the combustion-supporting air and the natural gas fuel are mixed, the combustion-supporting air and the natural gas at the ignition port 9 are ignited by the gas auxiliary burner to form a direct flame to heat the ladle lining, so as to solve the problems that the existing natural gas baking furnace has a poor waste heat recovery efficiency, resulting in an increase in energy consumption cost, and the heating temperature is limited, causing a short pouring construction time.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. Regenerative natural gas ladle preheater, including a molten steel ladle heating furnace (1), characterized in that: It also includes a ladle cover (2), the front end of the ladle heating furnace (1) is fixedly connected to the ladle cover (2), reinforcing rods (3) are fixedly installed at both the left and right ends of the ladle cover (2), an installation frame (4) is arranged at the rear end of the ladle heating furnace (1), a hydraulic lifting platform is arranged at the lower end of the ladle heating furnace (1), two installation frames (4) are arranged on the left and right sides of the ladle heating furnace (1), a blower (5) and an induced draft fan (6) are respectively fixedly installed at the upper ends of the two installation frames (4) through brackets, a heat preservation block (7) is fixedly installed at the upper end of the ladle cover (2), a temperature measuring sensor (8) is arranged at the upper end of the heat preservation block (7), an ignition port (9) is arranged on the lower end surface of the ladle cover (2), a gas auxiliary burner is arranged inside the ignition port (9), a mixing channel (201) is arranged inside the ladle cover (2), and the mixing channel (201) is communicated with the ignition port (9); A first regenerative cavity (11) and a second regenerative cavity (12) are respectively arranged on both sides inside the ladle heating furnace (1), a heat insulation cavity (10) is arranged inside the ladle heating furnace (1) between the first regenerative cavity (11) and the second regenerative cavity (12), and ceramic regenerative balls are arranged in both the first regenerative cavity (11) and the second regenerative cavity (12).

2. The regenerative natural gas ladle preheater according to claim 1, wherein: There are two mixing channels (201), and the two mixing channels (201) are respectively communicated with the first regenerative cavity (11) and the second regenerative cavity (12), and the end of the reinforcing rod (3) away from the ladle cover (2) is fixedly connected to the ladle heating furnace (1).

3. The regenerative natural gas ladle preheater according to claim 2, characterized in that: Lifting lugs (15) are arranged on the side of the upper end of the ladle heating furnace (1), through holes are formed on the surface of the lifting lugs (15), there are four lifting lugs (15), a natural gas pipe (16) is fixedly installed at the upper end of the ladle heating furnace (1), there are two natural gas pipes (16), the ends of the two natural gas pipes (16) are connected through a three-way valve, and a natural gas inlet hose is arranged on the three-way valve.

4. The regenerative natural gas ladle preheater according to claim 1, wherein: Intake pipes are installed at one ends of both the blower (5) and the induced draft fan (6), the other end of the blower (5) is communicated with the bottom of the first regenerative cavity (11) through a pipeline, and the other end of the induced draft fan (6) is communicated with the bottom of the second regenerative cavity (12) through a pipeline.

5. The regenerative natural gas ladle preheater according to claim 1, wherein: The same mixing channel (201) is formed inside the heat preservation block (7), the two mixing channels (201) are respectively communicated with the first regenerative cavity (11) and the second regenerative cavity (12), a control valve is arranged in the mixing channel (201), the temperature measuring sensor (8) is a thermocouple, there are two temperature measuring sensors (8), and the lower ends of the temperature measuring sensors (8) extend to the inside of the mixing channel (201).

6. The regenerative natural gas ladle preheater according to claim 1, wherein: The hydraulic lifting platform is composed of an upper support plate (401) and a lower fixing frame (402), the upper end of the upper support plate (401) is fixedly connected to the lower end of the ladle heating furnace (1), the lower fixing frame (402) is movably connected to the upper support plate (401) through a scissor-type support frame (403), and a hydraulic cylinder is arranged between the scissor-type support frame (403) and the upper support plate (401).

7. The regenerative natural gas ladle preheater according to claim 1, wherein: The ladle heating furnace (1) is composed of a fixed bottom plate (101) and a fixed top plate (102). The fixed bottom plate (101) and the fixed top plate (102) are fixedly connected through a frame plate (103). Side plates (104) are arranged on the side of the frame plate (103) between the fixed bottom plate (101) and the fixed top plate (102). A refractory wall (105) is arranged inside the ladle heating furnace (1), and a thermal insulation layer is arranged between the ladle heating furnace (1) and the refractory wall (105).

8. The regenerative natural gas ladle preheater according to claim 7, wherein: The refractory wall (105) is made of heat-insulating refractory bricks and is adapted to the first regenerative chamber (11) and the second regenerative chamber (12). The heat-insulating blocks (7) are made of refractory bricks.

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