High temperature metallurgical slag gas-solid heat exchange device

Abstract

The present invention relates to a high-temperature metallurgical slag gas-solid heat exchange device, comprising a heat exchange container with a support frame; the heat exchange container is provided with a slag inlet, a slag outlet, a slag leakage port, a bottom cold air inlet, a middle cold air inlet and a hot air outlet; a metallurgical slag support plate is fixedly provided at the lower end of the heat exchange container; the slag inlet is arranged at the top of the heat exchange container, and the slag leakage port is arranged at the bottom of the heat exchange container and is located below the metallurgical slag support plate; the slag outlet is arranged corresponding to the metallurgical slag support plate and is used for slag discharge; the bottom cold air inlet is located below the metallurgical slag support plate; the middle cold air inlet is located between the metallurgical slag support plate and the slag inlet; and the metallurgical slag support plate is evenly distributed with vents. The present invention can further improve the recycling of the residual heat of the high-temperature metallurgical slag through the middle cold air inlet, thereby greatly improving the heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the field of high-temperature gas waste heat recovery, and in particular to a high-temperature metallurgical slag gas-solid heat exchange device. Background Art

[0002] The efficient recovery and utilization of waste heat resources in metallurgical slag enterprises has always been the focus of the metallurgical industry. With the increasing energy bottleneck problem, the development, utilization and efficient recovery of sensible heat resources of high-temperature metallurgical slag will become one of the important energy-saving tasks of the steel industry in the future.

[0003] There are many ways to recover the waste heat of high-temperature metallurgical slag, among which gas-solid heat exchange is a common one. The so-called gas-solid heat exchange refers to the use of cold air to absorb the waste heat of high-temperature metallurgical slag and form hot air. The existing gas-solid heat exchange device places the high-temperature metallurgical slag in a heat exchange container, and then introduces cold air into the heat exchange container. The cold air passes through the accumulated high-temperature metallurgical slag to form hot air and is discharged from the heat exchange container.

[0004] The existing cold air flow direction is from top to bottom or from bottom to top. No matter which type of high-temperature metallurgical slag is close to the cold air inlet, the waste heat is absorbed first. After the heat exchange is completed, the high-temperature metallurgical slag far away from the cold air inlet often still has considerable waste heat resources, which is one of the reasons why the waste heat recovery efficiency of high-temperature metallurgical slag cannot be improved. Summary of the invention

[0005] The object of the present invention is to provide a high-temperature metallurgical slag gas-solid heat exchange device with high heat exchange efficiency.

[0006] The technical solution for achieving the purpose of the present invention is as follows: the present invention comprises a heat exchange container with a support frame; the heat exchange container is provided with a slag inlet, a slag outlet, a slag leakage outlet, a bottom cold air inlet, a middle cold air inlet and a hot air outlet; a metallurgical slag support plate is fixedly provided at the lower end of the heat exchange container; the slag inlet is arranged at the top of the heat exchange container, and the slag leakage outlet is arranged at the bottom of the heat exchange container and below the metallurgical slag support plate; the slag outlet is arranged corresponding to the metallurgical slag support plate and is used for slag discharge; the bottom cold air inlet is located below the metallurgical slag support plate; the middle cold air inlet is located between the metallurgical slag support plate and the slag inlet; and the metallurgical slag support plate is evenly provided with ventilation holes.

[0007] The above-mentioned central cold air inlet includes an annular air inlet manifold fixedly arranged on the outer wall of the heat exchange container and distributed in a ring along the axis of the heat exchange container, and the annular air inlet manifold is provided with an air inlet pipe connected to it; a plurality of air inlet holes are provided on the outer wall of the heat exchange container located in the annular air inlet manifold; the air inlet holes connect the interior of the heat exchange container with the annular air inlet manifold.

[0008] As an optimized design, a plurality of air inlet holes are evenly distributed along the circumference of the axis of the heat exchange container.

[0009] The metallurgical slag support plate is arranged obliquely; the slag outlet is arranged above the lower end of the metallurgical slag support plate.

[0010] The above-mentioned slag outlet is also equipped with a slag door device for opening or closing the slag outlet; the slag door device includes a slag door, a lock and a driving assembly for driving the slag door to open or close the slag outlet; the slag door is rotatably arranged on the slag outlet; the driving assembly includes a bracket and an electric push-pull rod; the bracket is fixedly connected to the outer wall of the heat exchange container, the base of the electric push-pull rod is rotatably connected to the bracket, and the working end of the electric push-pull rod is rotatably connected to the slag door; the slag door is driven to rotate and the slag outlet is opened or closed by the extension and retraction of the working end of the electric push-pull rod; the lock is used to lock the slag door when the slag door is in a closed state.

[0011] The heat exchange container is located above the metallurgical slag support plate and is provided with a slag pushing port opposite to the slag outlet.

[0012] The slag inlet is arranged at the top of the heat exchange container; a slag inlet buffer device is fixedly arranged in the heat exchange container just below the slag inlet; the slag inlet buffer device comprises a buffer member for guiding the high-temperature metallurgical slag entering from the slag inlet to pour around, and the buffer member is fixedly connected to the heat exchange container through a connecting frame. The buffer member can be conical or elliptical.

[0013] A reinforced support assembly is also provided on the lower surface of the metallurgical slag support plate; the reinforced support assembly includes a plurality of support plates distributed circumferentially and fixedly connected to the heat exchange container, and a slag leakage channel is formed between the support plates; the tops of the support plates are fixedly connected into one body through a connecting plate, and a support column is fixedly provided on the connecting plate, and the top of the support column is fixedly connected to the metallurgical slag support plate;

[0014] The bottom of the heat exchange container is arc-shaped, and the slag outlet is located at the top of the arc; the slag outlet is located in the space surrounded by each support plate.

[0015] The heat exchange container includes a container body and a head; the shell of the container body includes an outer shell, a thermal insulation coating layer, and refractory bricks from the outside to the inside; the shell of the head includes a head outer shell, a thermal insulation coating layer, and a tortoise shell mesh refractory concrete layer from the outside to the inside.

[0016] The present invention has positive effects: (1) The present invention can further effectively exchange heat with the molten slag in the middle and upper layers in the later stage of waste heat recovery through the middle cold air inlet, thereby making full use of the waste heat of the high-temperature metallurgical slag and achieving efficient heat exchange.

[0017] (2) The middle cold air inlet in the present invention can realize annular air inlet through the annular air inlet header and the air inlet holes, thereby making full contact with the molten slag in all directions, further improving the heat exchange efficiency.

[0018] (3) The metallurgical slag support plate of the present invention adopts an inclined design, which is conducive to the smooth discharge of the molten slag.

[0019] (4) The present invention utilizes the slag pushing port to push the material with the push rod when necessary (such as when the material is stuck), thereby further ensuring the smooth discharge of the molten slag.

[0020] (5) The present invention uses a slag inlet buffer device to reduce the impact of molten slag on the heat exchange container and effectively disperse the molten slag to facilitate subsequent waste heat recovery.

[0021] (6) The slag outlet device of the present invention can realize automatic opening and closing of the slag outlet, effectively reducing operational risks and improving safety.

[0022] (7) The present invention can effectively assist the metallurgical slag support plate by strengthening the support assembly, thereby improving the supporting force and impact resistance of the metallurgical slag support plate, increasing the service life of the equipment, and reducing the subsequent maintenance costs.

[0023] (8) The shell of the heat exchange container in the present invention is designed from the outside to the inside, so that the heat exchange container has both good impact resistance and good thermal insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a front view of the present invention;

[0027] Figure 3 It is a left side view of the present invention;

[0028] Figure 4 is a cross-sectional view of the present invention;

[0029] Figure 5 A top view of the present invention;

[0030] Figure 6 for Figure 4 The enlarged view of point Ⅰ in the middle;

[0031] Figure 7 for Figure 4 Enlarged view of point II in the middle. DETAILED DESCRIPTION

[0032] (Example 1)

[0033] See Figures 1 to 7The present invention includes a heat exchange container 1 with a support frame; the heat exchange container 1 is provided with a slag inlet 11, a slag outlet 12, a slag outlet 13, a bottom cold air inlet 14, a middle cold air inlet 15 and a hot air outlet 16; a metallurgical slag support plate 2 is fixedly provided at the lower end of the heat exchange container 1; the slag inlet 11 is arranged at the top of the heat exchange container 1, and the slag outlet 13 is arranged at the bottom of the heat exchange container 1 and is located below the metallurgical slag support plate 2; the slag outlet 12 is arranged corresponding to the metallurgical slag support plate 2 and is used for slag discharge; the bottom cold air inlet 14 is located below the metallurgical slag support plate 2; the middle cold air inlet 15 is located between the metallurgical slag support plate 2 and the slag inlet 11; the metallurgical slag support plate 2 is evenly distributed with ventilation holes.

[0034] The central cold air inlet 15 includes an annular air inlet manifold 151 fixedly arranged on the outer wall of the heat exchange container 1 and distributed in a ring along the axis of the heat exchange container 1, and the annular air inlet manifold 151 is provided with an air inlet pipe 152 connected thereto; a plurality of air inlet holes are provided on the outer wall of the heat exchange container 1 located inside the annular air inlet manifold 151; the air inlet holes connect the interior of the heat exchange container 1 with the annular air inlet manifold 151.

[0035] The plurality of air inlet holes are evenly distributed along the circumference of the axis of the heat exchange container 1 .

[0036] The metallurgical slag support plate 2 is arranged obliquely; the slag outlet 12 is arranged above the lower end of the metallurgical slag support plate 2 .

[0037] The slag outlet 12 is also provided with a slag door device 3 for opening or closing the slag outlet 12; the slag door device 3 includes a slag door 31, a lock 32 and a driving assembly 33 for driving the slag door 31 to open or close the slag outlet 12; the slag door 31 is rotatably arranged on the slag outlet 12; the driving assembly 33 includes a bracket 331 and an electric push-pull rod 332; the bracket 331 is fixedly connected to the outer wall of the heat exchange container 1, the base of the electric push-pull rod 332 is rotatably connected to the bracket 331, and the working end of the electric push-pull rod 332 is rotatably connected to the slag door 31; the slag door 31 is driven to rotate and the slag outlet 12 is opened or closed by the extension and retraction of the working end of the electric push-pull rod 332; the lock 32 is used to lock the slag door 31 when the slag door 31 is in a closed state.

[0038] The pull rod 333 includes a coaxially arranged connecting rod and a lead screw; the lower end of the connecting rod is rotatably connected to the slag discharge door 31, the upper end of the connecting rod is rotatably connected to the lower end of the lead screw, the upper end of the lead screw passes through the guide sleeve 334 and forms a threaded fit with the guide sleeve 334; the guide sleeve 334 is equivalent to a lead screw nut; the transmission assembly is a worm gear connected to the output shaft of the electric push-pull rod 332; the worm gear is in transmission fit with the lead screw; the electric push-pull rod 332 drives the worm gear to rotate, and the worm gear drives the lead screw to move linearly. The lock buckle 32 is used to lock the slag discharge door 31 when the slag discharge door 31 is in a closed state.

[0039] The heat exchange container 1 is located above the metallurgical slag support plate 2 and is provided with a slag pushing port 17 opposite to the slag outlet 12 .

[0040] The slag inlet 11 is arranged at the top of the heat exchange container 1; a slag inlet buffer device 4 is fixedly provided in the heat exchange container 1 directly below the slag inlet 11; the slag inlet buffer device 4 includes a buffer member 41 for guiding the high-temperature metallurgical slag entering from the slag inlet 11 to pour around, and the buffer member 41 is fixedly connected to the heat exchange container 1 through a connecting frame 42; the buffer member 41 is elliptical, and its arc surface is located at the top.

[0041] A reinforced support assembly 5 is further provided on the lower surface of the metallurgical slag support plate 2; the reinforced support assembly 5 includes a plurality of support plates 51 distributed circumferentially and fixedly connected to the heat exchange container 1, and a slag leakage channel is formed between the support plates 51 and the support plates 51; the tops of the support plates 51 are fixedly connected into one body through a connecting plate, and a support column 52 is fixedly provided on the connecting plate, and the top of the support column 52 is fixedly connected to the metallurgical slag support plate 2;

[0042] The bottom of the heat exchange container 1 is arc-shaped, and the slag outlet 13 is located at the top of the arc; the slag outlet 13 is located in the space surrounded by each support plate 51.

[0043] The heat exchange container 1 includes a container body and a head; the head is arranged at the upper end of the container body; the shell of the container body includes an outer shell 1-1, a thermal insulation coating layer 1-2, and a refractory brick 1-3 from the outside to the inside; the shell of the head includes a head outer shell 1-4, a thermal insulation coating layer 1-2, and a tortoise shell mesh refractory concrete layer 1-5 from the outside to the inside.

[0044] The working process of the present invention is as follows:

[0045] Preparation work: firstly put the high temperature metallurgical slag into the heat exchange container 1 from the slag inlet 11.

[0046] Front-stage heat exchange: cold air is introduced from the bottom cold air inlet 14 , passes through the accumulated high-temperature metallurgical slag to absorb waste heat, and forms hot air to be discharged from the hot air outlet 16 .

[0047] Heat exchange in the rear section: cold air is introduced from the middle cold air inlet 15 , and the cold air passes through the high-temperature metallurgical slag in the middle and upper layers to continue to absorb waste heat, and forms hot air to be discharged from the hot air outlet 16 .

[0048] Post-work: After the heat exchange is completed, the slag discharge door device 3 is opened, and the slag is discharged from the slag discharge port 12. If slag jamming occurs, the slag can be pushed out of the slag discharge port 12 through the slag pusher port 17 using a push rod. Some broken slag smaller than the vent holes on the metallurgical slag support plate can be discharged from the slag discharge port 13.

[0049] (Example 2)

[0050] In the present invention, the driving assembly 33 can be an electric push rod, and the telescopic shaft of the electric push rod is the pull rod 333. Other technical features are the same as those of the first embodiment.

[0051] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature metallurgical slag gas-solid heat exchange device, comprising a heat exchange container (1) with a support frame; characterized in that: The heat exchange container (1) is provided with a slag inlet (11), a slag outlet (12), a slag discharge port (13), a bottom cold air inlet (14), a middle cold air inlet (15) and a hot air outlet (16); a metallurgical slag support plate (2) is fixedly provided at the lower end of the heat exchange container (1); the slag inlet (11) is arranged at the top of the heat exchange container (1), and the slag discharge port (13) is arranged at the bottom of the heat exchange container (1) and below the metallurgical slag support plate (2); the slag outlet (12) is arranged corresponding to the metallurgical slag support plate (2) and is used for slag discharge; the bottom cold air inlet (14) is located below the metallurgical slag support plate (2); the middle cold air inlet (15) is located between the metallurgical slag support plate (2) and the slag inlet (11); and ventilation holes are evenly distributed on the metallurgical slag support plate (2); The central cold air inlet (15) comprises an annular air inlet header (151) fixedly arranged on the outer wall of the heat exchange container (1) and distributed in an annular manner along the axis of the heat exchange container (1); an air inlet pipe (152) communicating with the annular air inlet header (151) is provided on the annular air inlet header (151); a plurality of air inlet holes are provided on the outer wall of the heat exchange container (1) located inside the annular air inlet header (151); the air inlet holes communicate the interior of the heat exchange container (1) with the annular air inlet header (151); The metallurgical slag support plate (2) is arranged at an angle; the slag outlet (12) is arranged above the lower end of the metallurgical slag support plate (2); The slag outlet (12) is also provided with a slag outlet door device (3) for opening or closing the slag outlet (12); the slag outlet door device (3) comprises a slag outlet door (31), a lock (32) and a driving assembly (33) for driving the slag outlet door (31) to open or close the slag outlet (12); the slag outlet door (31) is rotatably arranged on the slag outlet (12); the driving assembly (33) comprises a bracket (331) and an electric push-pull rod (332); the bracket (3 31) is fixedly connected to the outer wall of the heat exchange container (1), the base of the electric push-pull rod (332) is rotatably connected to the bracket (331), and the working end of the electric push-pull rod (332) is rotatably connected to the slag discharge door (31); the slag discharge door (31) is driven to rotate and the slag discharge port (12) is opened or closed by the extension and contraction of the working end of the electric push-pull rod (332); the lock buckle (32) is used to lock the slag discharge door (31) when the slag discharge door (31) is in a closed state; The slag inlet (11) is arranged at the top of the heat exchange container (1); a slag inlet buffer device (4) is fixedly arranged in the heat exchange container (1) directly below the slag inlet (11); the slag inlet buffer device (4) comprises a buffer member (41) for guiding the high-temperature metallurgical slag entering from the slag inlet (11) to pour around, and the buffer member (41) is fixedly connected to the heat exchange container (1) via a connecting frame (42).

2. The high temperature metallurgical slag gas-solid heat exchange device according to claim 1, characterized in that: The plurality of air inlet holes are distributed at equal distances along the circumference of the axis of the heat exchange container (1).

3. The high temperature metallurgical slag gas-solid heat exchange device according to claim 1 or 2, characterized in that: The heat exchange container (1) is located above the metallurgical slag support plate (2) and is provided with a slag pushing port (17) opposite to the slag outlet (12).

4. The high temperature metallurgical slag gas-solid heat exchange device according to claim 1, characterized in that: A reinforced support assembly (5) is also provided on the lower surface of the metallurgical slag support plate (2); the reinforced support assembly (5) comprises a plurality of support plates (51) distributed circumferentially and fixedly connected to the heat exchange container (1), and a slag leakage channel is formed between the support plates (51) and the support plates (51); the tops of the support plates (51) are fixedly connected to form a whole through a connecting plate, and a support column (52) is fixedly provided on the connecting plate, and the top of the support column (52) is fixedly connected to the metallurgical slag support plate (2); The bottom of the heat exchange container (1) is arc-shaped, and the slag leakage port (13) is located at the top of the arc; the slag leakage port (13) is located in the space enclosed by each support plate (51).

5. The high temperature metallurgical slag gas-solid heat exchange device according to claim 1, characterized in that: The heat exchange container (1) comprises a container body and a head; the shell of the container body comprises, from the outside to the inside, an outer shell (1-1), a heat-insulating coating layer (1-2), and refractory bricks (1-3); the shell of the head comprises, from the outside to the inside, a head outer shell (1-4), a heat-insulating coating layer (1-2), and a tortoise-shell mesh refractory concrete layer (1-5).

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