Hot pressing block cooling system and method

Abstract

The invention relates to the technical field of metallurgy, and particularly discloses a hot-pressing block cooling system and method. Comprising a barrel rotating around the axial direction of the barrel and provided with a raw material inlet and a raw material outlet, a cooling assembly arranged in the axial direction of the barrel and used for cooling a high-temperature hot-pressing block in the barrel, and a steam cover connected with one end of the raw material outlet. The condensing system is communicated with the steam cover and used for condensing high-temperature steam generated when the high-temperature hot-pressing block is cooled, and the conveying system is arranged at the bottom of the steam cover. A high-temperature hot-pressing block generated by the hot press enters the rotating cylinder and is directly cooled under the action of atomized water generated by the cooling assembly, high-temperature steam formed after cooling passes through the steam cover and then enters the condensation system to be condensed to form liquid water for utilization, and the cooled hot-pressing block is conveyed to a designated station through the conveying system. The high-temperature hot-pressing block cooling device can effectively achieve rapid cooling of the high-temperature hot-pressing block, the cooling efficiency is high, heat can be fully recycled, and the energy utilization rate is high.

Description

Technical Field

[0001] The invention relates to the field of metallurgical technology, and more particularly to a hot pressed block cooling system and method. Background Art

[0002] Direct reduced iron process is gaining more and more attention as a technology to replace blast furnace smelting. In particular, hydrogen-based direct reduced iron process is a non-blast furnace ironmaking process that uses hydrogen-rich reducing gas to produce direct reduced iron (DRI); this process has been widely used around the world, especially in countries with advantages in resource endowment and energy structure. Hot press is mainly used to press high-temperature DRI (direct reduced iron or sponge iron) into HBI (hot briquetted iron).

[0003] Under high temperature conditions, the material binding properties are activated and pressed into blocks at high temperatures. HBI has the following advantages: HBI size and shape are compatible with standard material handling equipment. HBI can be loaded in batches or continuously fed into the smelting furnace; it can be stored in the open air, unlike DRI which requires an inert warehouse; DRI's hot briquetting (HBI) is the only passivation method that complies with the regulations of IMO (International Maritime Organization). Hot briquetting is the only reliable and fully accepted method to passivate DRI, converting DRI into a more convenient and safe form of hot briquetting iron (HBI). Therefore, HBI is widely used in the trade of DRI.

[0004] The pellets DRI produced by gas-based direct reduction are compacted by a hot press to form HBI. In the existing process, HBI cooling is generally performed by spraying water directly on a belt, which has low cooling efficiency, large water consumption, and heat cannot be recycled. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a hot pressed block cooling system and method, which can effectively realize the rapid cooling of high-temperature hot pressed blocks and methods, with high cooling efficiency, sufficient heat recovery and high energy utilization. It can be applied to a variety of different types of high-temperature materials, especially high-temperature reduction block materials that need to be prevented from oxidation;

[0006] The solution adopted by the present invention to solve the technical problem is:

[0007] A hot pressed block cooling system, comprising a cylinder rotating about its axial direction and provided with a raw material inlet and a raw material outlet, a cooling assembly arranged along the axial direction of the cylinder and used to cool the high-temperature hot pressed blocks in the cylinder, a steam hood connected to one end of the raw material outlet, a condensation system connected to the steam hood and used to condense high-temperature steam generated when the high-temperature hot pressed blocks are cooled, and a conveying system arranged at the bottom of the steam hood;

[0008] The high-temperature hot pressed blocks enter the rotating cylinder and are directly cooled by the atomized water generated by the cooling assembly. The high-temperature steam formed after cooling passes through the steam hood and enters the condensation system, where it condenses to form liquid water for circulation by the cooling assembly and the condensation system. The cooled hot pressed blocks are transported to the designated workstation through the conveying system.

[0009] The high-temperature hot pressed blocks generated by the hot press enter the cylinder through the raw material inlet, and the cylinder rotates around its axial direction to transport the high-temperature hot pressed blocks to one side of the raw material outlet. During the transportation process, the cooling component will generate atomized water, and the atomized water will act on the surface of the hot pressed blocks. The atomized water and the high-temperature hot pressed blocks are cooled by heat exchange, and the atomized water forms high-temperature steam; the high-temperature steam enters the condensation system through the steam hood for condensation. Specifically, the non-condensable gas in the high-temperature steam is discharged to the atmosphere, and the water vapor in the high-temperature steam releases its latent heat and is discharged in the form of liquid water together with the water with increased temperature after heat exchange for recycling; the cooled hot pressed blocks pass through the raw material outlet and fall from the bottom of the steam hood onto the conveying system for transportation; compared with the prior art, the present invention will use atomized water directly on the high-temperature hot pressed blocks instead of acting on the conveying belt of the conveying system, which can effectively achieve rapid cooling of the high-temperature hot pressed blocks, with high cooling efficiency and reduced waste of water resources.

[0010] In some possible implementations, in order to effectively realize the transportation of the high-temperature hot pressed block into the cylinder and to cool it through the cooling assembly;

[0011] The barrel includes a front end cover provided with a raw material inlet, a rear end cover provided with a raw material outlet, a barrel body rotatably matched with the front end cover and the rear end cover and connected to each other, two groups of support rings for supporting the barrel body and sleeved on the outside of the barrel body, and a rotating drive assembly that is transmission-matched with the barrel body and used to control the barrel body to rotate around its axial direction; the support ring is rotatably matched with the barrel body.

[0012] In some possible implementations, the angle formed by the axis of the cylinder body and the horizontal plane is A, where A=1.5°-2.5°.

[0013] In some possible implementations, in order to enable the high-temperature hot pressed blocks in the barrel body to move toward the raw material outlet when the barrel body rotates, the hot pressed blocks are prevented from sliding in the barrel body due to the rotation of the barrel body;

[0014] A spiral partition is arranged in the cylinder body and along the axial direction of the cylinder body.

[0015] In some possible implementations, in order to effectively control the cylinder body to rotate around its axial direction;

[0016] The rotation driving assembly comprises a driving member which is located between two groups of support rings and is used for controlling the rotation of the barrel body.

[0017] In some possible implementations, in order to enable the cooling assembly to always be located above the high-temperature hot pressing block in the cylinder, so that the atomized water can directly act on the high-temperature hot pressing block;

[0018] The cooling assembly includes a cooling water pipe located in the barrel body and fixed at both ends on the front cover and the rear cover, and an atomizing nozzle arranged along the axial direction of the cooling water pipe and located in the barrel body; the atomizing nozzle is connected to the cooling water pipe and is located at the bottom of the cooling water pipe.

[0019] In some possible implementations, in order to effectively protect the cylinder and monitor the temperature of the high-temperature hot pressing blocks entering the cylinder;

[0020] A nitrogen inlet is also provided on the front end cover, and the raw material inlet is externally connected to an inlet pipe. A temperature testing component 1 for monitoring the temperature of the high-temperature hot pressing block entering the cylinder is provided on the inlet pipe.

[0021] In some possible implementations, in order to effectively condense the high-temperature steam collected by the steam hood;

[0022] The condensation system comprises a steam pipe connected to the top of the steam hood, a condensation tower connected to the output end of the steam pipe, and a water storage tank connected to the condensation tower and used for storing and recovering water generated by the condensation tower.

[0023] In some possible implementations, in order to effectively realize the recycling of liquid water treated by the condensation system;

[0024] It also includes a sedimentation system connected to the water storage tank; the sedimentation system is connected to the cooling water pipe and the condensation tower through pipelines.

[0025] In some possible implementations, the condensation tower includes a tower body connected to a steam pipe and a water storage tank respectively, a main spray pipe, a secondary spray pipe and a demister arranged in the tower body.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention provides a cooling component in the cylinder, and the atomized water generated by the cooling component will directly act on the high-temperature hot pressing block, thereby greatly improving the cooling efficiency; the high-temperature steam generated after cooling enters the condensation system for condensation treatment, wherein the non-condensable gas in the high-temperature steam is discharged to the atmosphere after condensation, and the water vapor in the high-temperature steam releases its latent heat, and the water with the increased temperature after re-heat exchange with the condensation system in the form of liquid water is discharged into the water storage tank, and after precipitation treatment by the precipitation system, it enters the condensation system and the cooling component again for recycling, thereby effectively realizing that the heat can be fully recovered and the energy utilization rate is high;

[0028] The invention is applicable to different kinds of high-temperature materials, especially high-temperature reduced block materials that need to be prevented from oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Among them: 1. Cylinder body; 11. Front end cover; 111. Raw material inlet; 1111. Temperature test component one; 112. Nitrogen inlet; 12. Rear end cover; 13. Cylinder body; 14. Bracket ring; 15. Spiral partition; 16. Rotation drive component; 2. Cooling component; 21. Cooling water pipe; 22. Atomizing nozzle; 3. Steam hood; 31. Temperature test component three; 4. Condensation system; 41. Condensation tower; 411. Main spray pipe; 412. Secondary spray pipe; 413. Demister; 414. Temperature test component four; 42. Water storage tank; 421. Water pump; 5. Conveying system; 6. Steam pipe; 61. Jet ejector; 62. Temperature test component two. DETAILED DESCRIPTION

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The present invention is described in detail below.

[0033] like Figure 1 As shown;

[0034] A hot pressed block cooling system, comprising a barrel 1 which rotates about its axial direction and is provided with a raw material inlet 111 and a raw material outlet, a cooling assembly 2 which is arranged along the axial direction of the barrel 1 and is used to cool the high-temperature hot pressed blocks in the barrel 1, a steam hood 3 which is connected to one end of the raw material outlet, a condensation system 4 which is connected to the steam hood 3 and is used to condense the high-temperature steam generated when the high-temperature hot pressed blocks are cooled, a conveying system 5 which is arranged at the bottom of the steam hood 3, and a precipitation system which is respectively connected to the condensation system 4 and the cooling assembly 2 and is used to supply liquid water;

[0035] The raw material inlet 111 of the barrel 1 is connected to the discharge port of the hot press through an inlet pipe, and the high-temperature hot pressed blocks will enter the barrel 1. During the transportation process, atomized water will be generated by the cooling component 2 to directly cool the surface of the high-temperature hot pressed blocks.

[0036] Specifically, the high-temperature hot pressed blocks with a temperature of 600-700°C generated by the hot press enter the cylinder 1 through the raw material inlet 111, and the cylinder 1 rotates around its axis to transport the high-temperature hot pressed blocks to the raw material outlet side;

[0037] Furthermore, the distance between the axis of the cooling assembly 2 and the top surface of the cylinder 1 is smaller than the distance between the axis of the cooling assembly 2 and the bottom of the cylinder 1; this arrangement enables the sprayed atomized water to act on a larger cooling surface of the hot pressing block located in the middle and lower part of the cross section of the cylinder 1, and the cooling efficiency is higher;

[0038] During the transportation process, the cooling component 2 will generate atomized water, which directly acts on the surface of the high-temperature hot pressed block, and the atomized water exchanges heat with the high-temperature hot pressed block to cool it down, so that the temperature of the cooled hot pressed block is ≤80°C, and the atomized water forms high-temperature steam after heat exchange; the high-temperature steam flows to the raw material outlet, passes through the steam hood 3, and enters the condensation system 4 for condensation;

[0039] Specifically, after the non-condensable gas in the high-temperature steam is condensed by the condensation system 4, it is discharged into the atmosphere after the temperature meets the requirements, and the water vapor in the high-temperature steam releases its latent heat, and is discharged in the form of liquid water together with the water with a higher temperature after heat exchange and enters the precipitation system for treatment; the precipitation system is connected to the input end of the cooling component 2 and the condensation system 4, and the water after precipitation treatment enters the cooling component 2 and the condensation system 4 for recycling; the hot pressed block after cooling passes through the raw material outlet and falls from the bottom of the steam cover 3 to the conveying system 5 for conveying, and enters the next process;

[0040] Compared with the prior art, the present invention uses atomized water directly on the high-temperature hot pressed blocks instead of applying water to the conveyor belt of the conveying system 5, which can effectively achieve rapid cooling of the high-temperature hot pressed blocks with high cooling efficiency. Liquid water is atomized to form atomized water, which is directly applied to the high-temperature hot pressed blocks to form high-temperature steam, and the high-temperature steam is condensed to form liquid water, thereby achieving recycling, reducing the waste of water resources, and achieving heat recovery.

[0041] In some possible implementations, in order to effectively realize the transportation of the high-temperature hot pressed block into the barrel 1 and to cool it through the cooling assembly 2;

[0042] The barrel 1 includes a front end cover 11 provided with a raw material inlet 111, a rear end cover 12 provided with a raw material outlet, a barrel body 13 rotatably matched with the front end cover 11 and the rear end cover 12 and connected to each other, two groups of support rings 14 for supporting the barrel body 13 and sleeved on the outside of the barrel body 13, and a rotation drive assembly 16 that is transmission matched with the barrel body 13 and is used to control the barrel body 13 to rotate around its axial direction; the support ring 14 is rotatably matched with the barrel body 13; the front end cover 11 and the rear end cover 12 are respectively sealed and connected to the barrel body 13.

[0043] In some possible implementations, in order to enable the high-temperature hot pressed blocks in the barrel 1 to move toward the raw material outlet when the barrel body 13 rotates, the hot pressed blocks are prevented from sliding in the barrel body 13 due to the rotation of the barrel body 13;

[0044] The angle formed by the axis of the cylinder body 13 and the horizontal plane is A, A = 1.5°-2.5°; the distance between the front end cover 11 and the horizontal plane is smaller than the distance between the rear end cover 12 and the horizontal plane; the cylinder body 1 is located above the horizontal plane;

[0045] A spiral partition 15 is arranged in the barrel body 13 and along the axial direction of the barrel body 13; the spiral partition 15 is arranged coaxially with the barrel body 13; the above-mentioned angle and the arrangement of the spiral partition 15 are adopted to effectively prevent the high-temperature hot pressing block from sliding in the barrel body 13 without affecting the transportation of the hot pressing block;

[0046] Specifically, the cross-sectional height of the spiral partition 15 is smaller than the height of the hot pressing block; further, the height of the spiral partition 15 is 10 to 30 mm.

[0047] In some possible implementations, in order to effectively control the cylinder body 13 to rotate around its axial direction;

[0048] The rotation driving assembly 16 includes a driving member located between the two sets of support rings 14 and used to control the rotation of the barrel body 13 .

[0049] The driving member includes a gear ring fixedly mounted on the outer side of the barrel body 13, a gear meshing with the gear ring, and a driving motor connected to the gear transmission; the driving motor controls the gear to rotate, drives the gear ring to rotate, and then realizes the rotation of the barrel body 13 around its axial direction;

[0050] Furthermore, the driving motor is a variable frequency motor, and the operating frequency of the driving motor is determined according to the raw material processing volume and the raw material temperature; when the processing volume is large and / or the temperature is high, the operating frequency of the driving motor is slower, so that the conveying speed of the high-temperature hot pressed blocks is slower and the cooling time of the atomized water for the high-temperature hot pressed blocks is longer.

[0051] In some possible implementations, in order to enable the cooling assembly 2 to always be located above the high-temperature hot pressing block in the cylinder 1, so that the atomized water can directly act on the high-temperature hot pressing block;

[0052] The cooling assembly 2 includes a cooling water pipe 21 located in the barrel body 13 and with both ends fixed on the front cover 11 and the rear cover 12, and an atomizing nozzle 22 arranged axially along the cooling water pipe 21 and located in the barrel body 13; the atomizing nozzle 22 is connected to the cooling water pipe 21 and is located at the bottom of the cooling water pipe 21.

[0053] One end of the cooling water pipe 21 passes through the front cover 11 or the rear cover 12 and is connected to an external water supply pipe to supply liquid water; the cooling water pipe is connected to the sedimentation system through the water supply pipe;

[0054] The liquid water entering the cooling water pipe 21 is atomized by the atomizing nozzle 22 and directly acts on the high-temperature hot pressing block.

[0055] The front end cover 11 and the rear end cover 12 are respectively mounted inside the two ends of the cylinder body 13 and are sealed with the cylinder body 13; when the cylinder body 13 rotates, the front end cover 11 and the rear end cover 12 do not rotate, and the cooling water pipe 21 will be fixed by the front end cover 11 and the rear end cover 12, so that the cooling component 2 does not rotate, so that the cooling component 2 is always located above the high-temperature hot pressing block to achieve cooling of the surface of the high-temperature hot pressing block.

[0056] In some possible implementations, in order to effectively protect the cylinder 1;

[0057] A nitrogen inlet 112 is also provided on the front end cover 11. The raw material inlet 111 is externally connected to an inlet pipe. A temperature testing component 1111 for monitoring the temperature of the high-temperature hot pressing blocks entering the barrel 1 is provided on the inlet pipe.

[0058] The temperature testing component 1111 is used to monitor the temperature of the high-temperature hot pressing block entering the barrel body 13. When the temperature of the high-temperature hot pressing block is too high or other emergency situations occur, nitrogen protection can be used to prevent the high-temperature hot pressing block entering the barrel body 13 from oxidation.

[0059] In some possible implementations, in order to effectively condense the high-temperature steam collected by the steam hood 3;

[0060] The condensation system 4 includes a steam pipe 6 connected to the top of the steam hood 3, a condensation tower 41 connected to the output end of the steam pipe 6, and a water storage tank 42 connected to the condensation tower 41 and used to store and recover water generated by the condensation tower 41;

[0061] Furthermore, a jet ejector 61 is provided in the steam pipe 6 so that the high-temperature steam can smoothly enter the condensation tower 41 through the steam pipe 6;

[0062] Specifically, a liquid level sensor is installed on the water storage tank 42, and the liquid level of the liquid water in the water storage tank 42 is monitored by the liquid level sensor. When the liquid level exceeds the set maximum liquid level, a water pump 421 provided on the pipe connecting the water storage tank 42 and the sedimentation system will be turned on to transport the water in the water storage tank 42 to the sedimentation system. The liquid water treated by the sedimentation system will be used to supply water to the cooling component 2 and the condensation system 4, thereby realizing water recycling.

[0063] In some possible implementations, in order to effectively realize the recycling of the liquid water treated by the condensation system 4;

[0064] The precipitation system is connected to the cooling water pipe 21 and the condensation tower 41 through pipelines.

[0065] In some possible implementations, the condensation tower 41 includes a tower body connected to the steam pipe 6 and the water storage tank 42, respectively, a main spray pipe 411, a secondary spray pipe 412 and a demister 413 arranged in the tower body; the precipitation system is connected to the main spray pipe 411 and the secondary spray pipe 412 through a pipeline;

[0066] The main spray pipe 411 is used to perform the first condensation treatment on the high-temperature steam entering the tower body, and the secondary spray pipe 412 is used to perform the second condensation treatment on the high-temperature steam after the first condensation treatment. The demister 413 removes water droplets in the steam so that it will not be discharged into the atmosphere together with the gas.

[0067] Furthermore, a temperature testing component 2 62 for monitoring the steam temperature in the steam pipe 6 is provided on the steam pipe 6, a temperature testing component 3 31 for detecting the temperature of the hot pressed block after cooling is provided at the bottom of the steam cover 3, and a temperature testing component 4 414 is provided in the condensation tower 41 and located above the secondary spray pipe 412;

[0068] Temperature testing component two 62 is used to monitor the steam temperature in the steam pipe 6; temperature testing component three 31 is used to monitor the temperature of the hot pressed block after cooling; temperature testing component four 414 is used to monitor the temperature of the non-condensable gas, and when the temperature of the non-condensable gas is ≤40°C, it is discharged from the top of the spray tower to the atmosphere; the above three groups of temperature testing components cooperate with temperature testing component one 1111 to achieve the adjustment of the operating power of the drive motor, so that the temperature of the hot pressed block after cooling meets the requirements and is ≤80°C.

[0069] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A hot pressing block cooling system, characterized in that: The invention comprises a cylinder body which rotates about its axial direction and is provided with a raw material inlet and a raw material outlet, a cooling assembly which is arranged along the axial direction of the cylinder body and is used to cool the high-temperature hot pressed blocks in the cylinder body, a steam hood which is connected to one end of the raw material outlet, a condensation system which is connected to the steam hood and is used to condense the high-temperature steam generated when the high-temperature hot pressed blocks are cooled, and a conveying system which is arranged at the bottom of the steam hood; The high-temperature hot pressed blocks enter the rotating cylinder and are directly cooled by the atomized water generated by the cooling assembly. The high-temperature steam formed after cooling passes through the steam hood and enters the condensation system, where it condenses into liquid water for use. The cooled hot pressed blocks are transported to the designated workstation through the conveying system.

2. A hot pressing block cooling system according to claim 1, characterized in that: The barrel includes a front end cover provided with a raw material inlet, a rear end cover provided with a raw material outlet, a barrel body rotatably matched with the front end cover and the rear end cover and connected to each other, two groups of support rings for supporting the barrel body and sleeved on the outside of the barrel body, and a rotating drive assembly that is transmission-matched with the barrel body and used to control the barrel body to rotate around its axial direction; the support ring is rotatably matched with the barrel body.

3. A hot pressing block cooling system according to claim 2, characterized in that: The angle formed by the axis of the cylinder body and the horizontal plane is A, A=1.5°-2.5°.

4. A hot pressing block cooling system according to claim 2, characterized in that: A spiral partition is arranged in the cylinder body and along the axial direction of the cylinder body.

5. A hot pressing block cooling system according to claim 2, characterized in that: The rotation driving assembly comprises a driving member which is located between two groups of support rings and is used for controlling the rotation of the barrel body.

6. A hot pressing block cooling system according to claim 2, characterized in that: The cooling assembly includes a cooling water pipe located in the barrel body and fixed at both ends on the front cover and the rear cover, and an atomizing nozzle arranged along the axial direction of the cooling water pipe and located in the barrel body; the atomizing nozzle is connected to the cooling water pipe and is located at the bottom of the cooling water pipe.

7. A hot pressing block cooling system according to claim 2, characterized in that: A nitrogen inlet is also provided on the front end cover, and the raw material inlet is externally connected to an inlet pipe. A temperature testing component 1 for monitoring the temperature of the high-temperature hot pressing block entering the cylinder is provided on the inlet pipe.

8. A hot pressing block cooling system according to claim 1, characterized in that: The condensation system comprises a steam pipe connected to the top of the steam hood, a condensation tower connected to the output end of the steam pipe, and a water storage tank connected to the condensation tower and used for storing and recovering water generated by the condensation tower.

9. A hot pressing block cooling system according to claim 8, characterized in that: It also includes a sedimentation system connected to the water storage tank; the sedimentation system is connected to the cooling water pipe and the condensation tower through pipelines; the condensation tower includes a tower body connected to the steam pipe and the water storage tank respectively, a main spray pipe arranged in the tower body, a secondary spray pipe and a demister.

10. A cooling method for a hot pressing block cooling system according to any one of claims 1 to 9, characterized in that: The high-temperature hot pressed blocks enter the rotating cylinder and are directly cooled by the atomized water generated by the cooling assembly. The high-temperature steam formed after cooling passes through the steam hood and enters the condensation system, where it condenses to form liquid water for recycling by the cooling assembly and the condensation system. The cooled hot pressed blocks are transported to the designated workstation through the conveying system.

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