Blast furnace hot blast stove with high-efficiency heat preservation structure

Abstract

The utility model discloses a blast furnace hot blast furnace with high -efficient heat preservation structure relates to blast furnace hot blast furnace technical field, the utility model discloses a furnace body and heat preservation subassembly are connected with the fixed firebrick heat preservation shell of inner wall of furnace body, the inner chamber of firebrick heat preservation shell is provided with spiral heating pipeline, and both ends of spiral heating pipeline all are through to the outside of furnace body. The utility model discloses a heat preservation subassembly, utilize the heat insulating layer that forms in the furnace body surface with the cooperation of isolating cover and rock wool heat preservation layer, reduce the heat loss of furnace body inside to outside, recycle the waste heat in high temperature flue gas through the smoke pipe and heating shell simultaneously, and utilize the air that heats after the air -feed fan is guided into the shunt box and is shunted, and part hot air enters the mixing cavity and improves the combustion efficiency, and part hot air circulates and flows in the gap of rock wool heat preservation layer and forms the air current heat preservation layer, and the influence of outside low -temperature environment is blocked, and the temperature stability in the stove is maintained, and the thermal energy utilization efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of blast furnace hot blast stoves, and in particular relates to a blast furnace hot blast stove with a high-efficiency heat preservation structure. Background Technology

[0002] The blast furnace hot blast stove is a crucial auxiliary device in the blast furnace ironmaking system. Its main function is to continuously supply high-temperature hot blast to the blast furnace to support the combustion of coke and injected fuel inside the furnace. It heats the internal refractory checker bricks by burning blast furnace gas or mixed gas to store heat. During the blast cycle, cold air passes through the heated checker brick channels and is rapidly heated. This efficient regenerative heat exchange process ensures that the blast furnace can obtain stable and high-temperature blast. Ultimately, the hot blast provided by the hot blast stove reduces the coke ratio in ironmaking and effectively improves the blast furnace's smelting efficiency and production capacity.

[0003] Chinese patent application CN216744915U discloses a hot air furnace structure with high efficiency and energy saving. The lower part of the inner cavity of the hot air furnace body has a second combustion chamber. The inner walls of both sides of the second combustion chamber are fixed with mounting plates. The back of the mounting plates is fixed with a second motor. The rotor of the second motor is coaxially inserted through the mounting plates and fixed with a turntable. The front of the turntable is fixed with a mounting block. The surface of the mounting block is equipped with a lifting rod through a rotating shaft. The top of the lifting rod is equipped with a slider through a rotating shaft. The added first motor drives the rotating rod to rotate. The rotating rod drives the stirring frame to rotate, which can break up the coal lumps accumulated in the first combustion chamber. At the same time, the added filter plate can filter the coal slag into the second combustion chamber for combustion, so that the coal slag and coal lumps are separated, the contact area between the coal lumps and air is increased, and the combustion efficiency of the coal lumps is improved.

[0004] Although this patent improves the combustion efficiency of coal by breaking up the coal inside the combustion chamber, thus enhancing the energy-saving effect of the hot blast stove, it lacks efficient heat preservation. When the outside temperature is too low, heat inside the furnace is easily lost through the furnace shell, making it difficult to maintain a stable furnace temperature for a long time. This results in reduced thermal energy utilization efficiency, affecting the overall operating efficiency of the blast furnace system and making it unsuitable for use.

[0005] To address these issues, we provide a blast furnace hot blast stove with a highly efficient heat preservation structure. Utility Model Content

[0006] The purpose of this utility model is to provide a blast furnace hot blast stove with a high-efficiency heat preservation structure. By combining the heat preservation components and the turbulence mechanism, it solves the problem that the existing blast furnace hot blast stoves do not have a high-efficiency high-temperature function, and when the external ambient temperature is low, the internal heat will continue to be lost, increasing energy consumption and reducing operating efficiency.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a blast furnace hot blast stove with a high-efficiency heat preservation structure, comprising a furnace body and a heat preservation component. A fireproof brick insulation shell is fixedly connected to the inner wall of the furnace body. A spiral heating pipe is installed inside the fireproof brick insulation shell, with both ends of the spiral heating pipe extending to the outside of the furnace body. A burner is fixedly connected to the bottom of the furnace body's inner cavity. A feed pipe on one side of the burner penetrates the furnace body and connects to a mixing chamber. The heat preservation component includes an isolation cover, with a rock wool insulation layer between the isolation cover and the furnace body. A flue pipe is connected to the top of the furnace body, with the top of the flue pipe extending to the outside of the isolation cover and fitted with a heating shell. A heat-conducting plate is fixedly connected to the surface of the flue pipe and located inside the heating shell. The front side of the isolation cover is connected to the heating shell via an exhaust fan. A diversion box is fixedly connected to the rear side of the furnace body, with a turbulence-inducing mechanism on the top of the diversion box. Both sides of the top of the diversion box are connected to the heating shell and the isolation cover via conduits.

[0009] The present invention is further configured such that the turbulence mechanism includes a hydraulic cylinder, the top of the hydraulic cylinder is fixedly connected to the diversion box, a drive motor is fixedly connected to the top of the output end of the hydraulic cylinder, and a stirring paddle is fixedly connected to the bottom of the output end of the drive motor. The bottom of the stirring paddle extends through the inner cavity of the diversion box. The hydraulic cylinder can control the operating height of the drive motor and the stirring paddle. The stirring paddle can cooperate with the drive motor to stir the hot air inside the diversion box, thereby increasing its residence time inside the diversion box.

[0010] The present invention is further configured such that a limiting shell is fixedly connected to the bottom of the inner cavity of the diversion box, and a limiting plate is provided in the inner cavity of the limiting shell. The bottom of the stirring paddle passes through the limiting shell and is movably connected to the limiting plate through a bearing. The limiting shell and the limiting plate can limit the stirring paddle, so that it can move up and down smoothly and prevent it from deviating during the movement. The bearing is used to increase the stability of the stirring paddle during rotation.

[0011] The present invention is further configured such that a sliding rod is fixedly connected to the right side of the top of the diversion box, a sliding sleeve is slidably connected to the surface of the sliding rod, the left side of the sliding sleeve is fixedly connected to the drive motor, and a through hole is provided on the top of the diversion box for use with the stirring paddle. The sliding rod and the sliding sleeve can limit the drive motor so that it can be stably adjusted up and down. The through hole facilitates the rotation of the stirring paddle while it is moving.

[0012] The present invention is further configured such that the right side of the distribution box is connected to the mixing chamber via a conveying pipe, and heat-conducting plates are fixedly connected to the top and bottom of the inner cavity of the distribution box. The rear side of the heat-conducting plate extends into the inner cavity of the furnace body. The conveying pipe can transport the hot air inside the distribution box to the mixing chamber. The heat-conducting plate can conduct part of the heat inside the combustion chamber of the furnace body to the distribution box through its heat conduction capacity for secondary heating of the hot air.

[0013] The present invention is further configured such that a grid frame is fixedly connected between the front and rear sides of the furnace body cavity, and a gas pipeline is connected to the rear side of the mixing chamber. The grid frame can separate the furnace cavity and the combustion chamber of the furnace body, and the gas pipeline can transport gas to the interior of the mixing chamber.

[0014] The present invention is further configured such that mounting plates are fixedly connected to both sides of the bottom front and rear sides of the furnace body, and mounting holes are provided on both sides of the top of the mounting plates. The mounting plates and mounting holes can install the furnace body in a designated position, thereby improving its stability during operation.

[0015] The present invention has the following beneficial effects.

[0016] 1. This utility model uses a heat insulation component, in conjunction with an isolation cover and a rock wool insulation layer, to form a heat insulation layer on the furnace surface, reducing the loss of heat from the furnace interior to the outside. At the same time, the exhaust pipe and heating shell recover the waste heat from the high-temperature flue gas, and the exhaust fan guides the heated air into the distribution box for diversion. Some of the hot air enters the mixing chamber to improve combustion efficiency, while some of the hot air circulates in the gaps of the rock wool insulation layer to form an airflow insulation layer, blocking the influence of the external low-temperature environment, maintaining the stability of the furnace temperature, and improving the efficiency of heat energy utilization.

[0017] 2. This utility model uses a turbulence mechanism and a hydraulic cylinder to adjust the height of the drive motor and the stirring paddle. The rotation of the stirring paddle disturbs the flow of hot air inside the distribution box, prolonging the residence time of the hot air in the box. At the same time, the heat conduction plate transfers the high-temperature heat inside the furnace body to the distribution box for secondary heating of the air, further increasing the temperature of the hot air. The high-temperature air is then delivered to the combustion chamber and the insulation layer of the isolation cover through the distribution pipe, enhancing the overall insulation effect and reducing heat loss. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 A first-view perspective perspective view of a blast furnace hot blast stove with a highly efficient heat preservation structure;

[0020] Figure 2A second-view perspective perspective view of a blast furnace hot blast stove with a highly efficient heat preservation structure;

[0021] Figure 3 A three-dimensional cross-sectional view of a heat insulation component in a blast furnace hot blast stove with a high-efficiency heat insulation structure;

[0022] Figure 4 This is a schematic diagram showing the separation of the isolation cover and the rock wool insulation layer in a blast furnace hot blast stove with a high-efficiency heat preservation structure.

[0023] Figure 5 This is a three-dimensional cross-sectional view of a turbulence mechanism in a blast furnace hot blast stove with a highly efficient heat preservation structure.

[0024] In the attached diagram: 1. Furnace body; 2. Fireproof brick insulation shell; 3. Spiral heating pipe; 4. Burner; 5. Mixing chamber; 6. Insulation component; 61. Isolation cover; 62. Rock wool insulation layer; 63. Exhaust pipe; 64. Heating shell; 65. Heat-conducting plate; 66. Diversion box; 67. Baffle mechanism; 68. Exhaust fan; 671. Hydraulic cylinder; 672. Drive motor; 673. Stirring paddle; 7. Heat-conducting plate; 8. Grille frame. Detailed Implementation

[0025] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1

[0027] Please see Figure 1-5 This utility model relates to a blast furnace hot blast stove with a high-efficiency heat preservation structure, comprising a furnace body 1 and a heat preservation component 6. A fireproof brick insulation shell 2 is fixedly connected to the inner wall of the furnace body 1. A spiral heating pipe 3 is installed inside the fireproof brick insulation shell 2, with both ends of the spiral heating pipe 3 extending to the outside of the furnace body 1. A burner 4 is fixedly connected to the bottom of the inner cavity of the furnace body 1. A feed pipe on one side of the burner 4 penetrates the furnace body 1 and connects to a mixing chamber 5. The heat preservation component 6 includes an isolation cover 61, with rock wool placed between the isolation cover 61 and the furnace body 1. The furnace body 1 has an insulation layer 62 and a flue pipe 63 connected to the top. The top of the flue pipe 63 extends to the outside of the isolation cover 61 and is fitted with a heating shell 64. A heat-conducting plate 65 is fixedly connected to the surface of the flue pipe 63 and inside the heating shell 64. The front side of the isolation cover 61 is connected to the heating shell 64 through an exhaust fan 68. A diversion box 66 is fixedly connected to the rear side of the furnace body 1. A turbulence mechanism 67 is provided on the top of the diversion box 66. The two sides of the top of the diversion box 66 are connected to the heating shell 64 and the isolation cover 61 through conduits.

[0028] Specifically: the fireproof brick insulation shell 2 can retain heat, facilitating the heating of the air transported inside the spiral heating pipe 3, causing its temperature to rise rapidly; the burner 4 can burn inside the furnace body 1, maintaining the internal temperature of the furnace body 1; the mixing chamber 5 can mix hot air and fuel gas, improving the combustion efficiency of the burner 4; the isolation cover 61 facilitates the installation of the rock wool insulation layer 62, allowing the rock wool insulation layer 62 to wrap around the furnace body 1; the exhaust pipe 63 can discharge the high-temperature flue gas inside the furnace body 1, and the heat of the high-temperature flue gas is conducted to the interior of the heating shell 64 through the heat-conducting plate 65. The exhaust fan 68 draws the air out of the isolation cover 61 and into the heating shell 64. The heat-conducting plate 65 heats the air. After entering the distribution box 66, the hot air is agitated by the turbulence mechanism 67, which works with the heat-conducting plate 7 to raise the temperature of the hot air. Then, the distribution box 66 divides the hot air, with some entering the mixing chamber 5 and some entering the isolation cover 61. The hot air flows in the gaps of the rock wool insulation layer 62, forming a thermal insulation layer on the surface of the furnace body 1, improving the insulation effect of the furnace body 1 and preventing the rapid loss of heat inside the furnace body 1 when the outside temperature is low.

[0029] Example 2

[0030] Please see Figure 1-5 Based on Embodiment 1, the turbulence mechanism 67 includes a hydraulic cylinder 671. The top of the hydraulic cylinder 671 is fixedly connected to the diversion box 66. A drive motor 672 is fixedly connected to the top of the output end of the hydraulic cylinder 671. A stirring paddle 673 is fixedly connected to the bottom of the output end of the drive motor 672. The bottom of the stirring paddle 673 extends into the inner cavity of the diversion box 66. A limiting shell is fixedly connected to the bottom of the inner cavity of the diversion box 66. A limiting plate is provided in the inner cavity of the limiting shell. The bottom of the stirring paddle 673 extends through the limiting shell and is movably connected to the limiting plate through a bearing. A sliding rod is fixedly connected to the right side of the top of the diversion box 66. A sliding sleeve is slidably connected to the surface of the slide rod. The left side of the sliding sleeve is fixedly connected to the drive motor 672. A through hole for use with the stirring paddle 673 is opened on the top of the diversion box 66. The right side of the diversion box 66 is connected to the mixing chamber 5 through a conveying pipe. A heat-conducting plate 7 is fixedly connected to the top and bottom of the inner cavity of the diversion box 66. The rear side of the heat-conducting plate 7 extends into the inner cavity of the furnace body 1. A grid frame 8 is fixedly connected between the front and rear sides of the inner cavity of the furnace body 1. A gas pipeline is connected to the rear side of the mixing chamber 5. Mounting plates are fixedly connected to both sides of the bottom of the front and rear sides of the furnace body 1. Mounting holes are opened on both sides of the top of the mounting plates.

[0031] Specifically: Hydraulic cylinder 671 controls the operating height of drive motor 672 and agitator 673. Agitator 673 works with drive motor 672 to agitate the hot air inside distributor box 66, increasing its residence time inside distributor box 66. Limiting shell and limiting plate limit agitator 673, allowing it to move smoothly up and down and preventing deviation during movement. Bearings increase the stability of agitator 673 during rotation. Sliding rod and sliding sleeve limit drive motor 672, ensuring stable operation. The vertical position can be adjusted, and the through hole facilitates the rotation of the stirring paddle 673 while it is moving. The conveying pipe can transport the hot air inside the distribution box 66 to the mixing chamber 5. The heat-conducting plate 7 can conduct some of the heat inside the combustion chamber of the furnace body 1 to the distribution box 66 through its heat conduction capacity for secondary heating of the hot air. The grid frame 8 can separate the furnace cavity and combustion chamber of the furnace body 1. The gas pipeline can transport the gas to the mixing chamber 5. The mounting plate and mounting holes can install the furnace body 1 in a designated position to improve its stability during operation.

[0032] The working principle of this utility model is as follows: When the hot air furnace is running, the burner 4 generates a high-temperature flame in the furnace body 1. The heat is stored in the fireproof brick insulation shell 2 and heats the air in the spiral heating pipe 3. The high-temperature flue gas is discharged through the exhaust pipe 63. The remaining heat is absorbed by the heat-conducting plate 65 and transferred to the inner cavity of the heating shell 64. The exhaust fan 68 draws the air out of the isolation cover 61 and delivers it to the interior of the heating shell 64. After the air is heated, it is introduced into the distribution box 66. Then, the hydraulic cylinder 671 adjusts the height of the drive motor 672. After the drive motor 672 starts, it drives the stirring paddle 673 to rotate and disturb the hot air in the distribution box 66, prolonging the residence time of the hot air. At the same time, the heat-conducting plate 7 conducts the high temperature in the furnace body 1 to the distribution box 66 for secondary heating. Part of the hot air enters the mixing chamber 5 through the conveying pipe to assist combustion, and the other part flows back to the isolation cover 61 through the conduit. A circulating hot airflow barrier is formed in the gap of the rock wool insulation layer 62, which effectively blocks the external low temperature, reduces the heat loss of the furnace body 1, and maintains the internal temperature stability.

[0033] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A blast furnace hot blast stove with a high-efficiency heat preservation structure, comprising a furnace body (1) and a heat preservation component (6), characterized in that: The inner wall of the furnace body (1) is fixedly connected to a fireproof brick insulation shell (2), and the inner cavity of the fireproof brick insulation shell (2) is provided with a spiral heating pipe (3). Both ends of the spiral heating pipe (3) extend to the outside of the furnace body (1). The bottom of the inner cavity of the furnace body (1) is fixedly connected to a burner (4), and the feed pipe on one side of the burner (4) extends through the furnace body (1) and is connected to a mixing chamber (5). The insulation component (6) includes an isolation cover (61), a rock wool insulation layer (62) is provided between the isolation cover (61) and the furnace body (1), the top of the furnace body (1) is connected to a flue pipe (63), the top of the flue pipe (63) extends to the outside of the isolation cover (61) and is fitted with a heating shell (64), a heat-conducting plate (65) is fixedly connected to the surface of the flue pipe (63) and located in the inner cavity of the heating shell (64), the front side of the isolation cover (61) is connected to the heating shell (64) through a fan (68), a diversion box (66) is fixedly connected to the rear side of the furnace body (1), a turbulence mechanism (67) is provided on the top of the diversion box (66), and the two sides of the top of the diversion box (66) are connected to the heating shell (64) and the isolation cover (61) through conduits.

2. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 1, characterized in that: The turbulence mechanism (67) includes a hydraulic cylinder (671), the top of which is fixedly connected to the diversion box (66), a drive motor (672) is fixedly connected to the top of the output end of the hydraulic cylinder (671), and a stirring paddle (673) is fixedly connected to the bottom of the output end of the drive motor (672), with the bottom of the stirring paddle (673) penetrating into the inner cavity of the diversion box (66).

3. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 2, characterized in that: The bottom of the inner cavity of the diversion box (66) is fixedly connected to a limiting shell, and the inner cavity of the limiting shell is provided with a limiting plate. The bottom of the stirring paddle (673) passes through the limiting shell and is movably connected to the limiting plate through a bearing.

4. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 2, characterized in that: A sliding rod is fixedly connected to the right side of the top of the diversion box (66), and a sliding sleeve is slidably connected to the surface of the sliding rod. The left side of the sliding sleeve is fixedly connected to the drive motor (672). A through hole is opened on the top of the diversion box (66) to cooperate with the stirring paddle (673).

5. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 1, characterized in that: The right side of the diversion box (66) is connected to the mixing chamber (5) through a conveying pipe. The top and bottom of the inner cavity of the diversion box (66) are fixedly connected to heat-conducting plates (7), and the rear side of the heat-conducting plates (7) extends into the inner cavity of the furnace body (1).

6. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 1, characterized in that: A grid frame (8) is fixedly connected between the front and rear sides of the inner cavity of the furnace body (1), and a gas pipeline is connected to the rear side of the mixing chamber (5).

7. A blast furnace hot blast stove with a high-efficiency heat preservation structure according to claim 1, characterized in that: The furnace body (1) has mounting plates fixedly connected to both sides of the bottom front and rear sides, and mounting holes are provided on both sides of the top of the mounting plates.

Images