A waste heat recovery device for intermittent roller pressing of high-temperature steel slag

Abstract

The present invention provides an intermittent roller-pressed high-temperature steel slag waste heat recovery device, comprising a water-cooled roller structure, a water-cooled pumping plate, a membrane water-cooled wall structure, and a main heat exchange tube bundle buried in a high-temperature steel slag layer; the water-cooled roller structure is installed inside a crushing bin, and can rotate while moving in a horizontal direction, and is used to crush the steel slag by roller pressing; the water-cooled pumping plate is installed below the high-temperature steel slag layer, and the left and right halves can be pumped in and out in a horizontal direction respectively for the switch structure; the membrane water-cooled wall structure is installed at the two side walls and the top cover position in the crushing bin, and the lower part of the roller is arranged along the side wall, and the upper part of the roller without a wall is arranged on both sides, and is used for the waste heat recovery of high-temperature steel slag. When the recovery device is working, the middle of the two halves of the water-cooled pumping plate is closed, the water-cooled wall cover plate on the top of the bin is opened, and the high-temperature steel slag falls into the crushing bin, and is crushed by roller pressing of the roller structure, and the water-cooled wall tube bundles on both sides of the crushing bin, the water-cooled wall cover plate, and the main heat exchange tube bundle and the water-cooled pumping plate at the lower end of the roller structure absorb heat at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature molten slag treatment in the iron and steel metallurgical industry, and in particular relates to a waste heat recovery device for intermittent roller-pressed high-temperature steel slag. Background Art

[0002] High temperature slag, as a typical by-product of the steel industry, can reach a temperature of 1450-1650℃. The sensible heat contained in each ton of high temperature slag can be estimated to be 1770MJ / t. At present, most blast furnace slag is quenched by water to recover the heat in the blast furnace slag. The blast furnace slag produced can only be used as a cement admixture, and the slag flushing water needs post-treatment process before it can be further used as heating hot water. This not only wastes a lot of sensible heat in the blast furnace slag, but also wastes a lot of water resources. At the same time, a large amount of water mist is generated on site, which becomes an unorganized emission of waste gas. In terms of dry waste heat recovery, wind quenching fluidized bed is currently widely used as blast furnace slag waste heat recovery device internationally. However, the fluidized bed is very prone to back mixing and uneven gas-solid contact, large leakage, resulting in low waste heat recovery rate, slow particle cooling rate, and unable to meet the requirements of slag particle vitreous body. Therefore, the fluidized bed waste heat recovery process has not been further industrialized.

[0003] In the future, as steel production increases, more and more high-temperature slag will be discharged. Faced with the limited efficiency of high-temperature slag waste heat recovery mentioned above, there is an urgent need for a high-efficiency, high-quality recovery device or method to promote industrial energy conservation and emission reduction, realize the resource utilization of high-temperature slag, and comprehensively promote green manufacturing in this industry. Summary of the invention

[0004] Technical solution: In order to solve the above-mentioned technical problems, the present invention provides an intermittent roller-pressed high-temperature steel slag waste heat recovery device, comprising a water-cooled roller wheel structure, a water-cooled pumping plate, a membrane water-cooled wall structure, and a heat exchange tube bundle; the water-cooled roller wheel structure is installed inside the crushing bin, and is used for roller-pressing and crushing the steel slag; the water-cooled pumping plate is fixedly installed below the water-cooled roller wheel structure; the membrane water-cooled wall structure is installed on the inner wall of the crushing bin, and is used for recovering the high-temperature steel slag waste heat around the water-cooled roller wheel structure; the heat exchange tube bundle is buried inside the high-temperature steel slag, and is used for recovering the high-temperature molten slag waste heat around the tube.

[0005] As another improvement, the water-cooled roller structure is a roller structure with a roller shaft passing through, wherein both ends are fixed in the guide rails of the inner wall of the crushing chamber through the roller shaft, and can rotate circumferentially along the roller shaft and / or translate in the guide rails along the roller shaft.

[0006] As another improvement, the membrane water-cooled wall structure includes a water-cooled wall tube bundle and a water-cooled wall cover plate; the water-cooled wall cover plate is arranged as an openable structure and installed at the top of the crushing bin to allow high-temperature steel slag to enter / absorb heat after closure; the water-cooled wall tube bundle is arranged in multiple groups and distributed side by side on the inner wall of the crushing bin to recover the waste heat of the steel slag.

[0007] As another improvement, the water-cooled pumping plate is a split-type water-cooled hollow plate structure, assembled from two half-plate structures, wherein a circulating water cooling structure is arranged inside the hollow plate structure, and the structure extends along the vertical section where the slag falls to the outside of the crushing bin wall.

[0008] As another improvement, it also includes a slag hopper plate and a slag receiving device; the slag hopper plate is fixedly installed below the water-cooled pumping plate to receive the steel slag dropped from the water-cooled pumping plate; the slag receiving device is movably arranged below the slag hopper plate to receive the steel slag dropped from the slag hopper plate.

[0009] Beneficial effect: When the crushing bin proposed by the present invention is working, the middle of the two halves of the water-cooled pumping plate is closed, the water-cooled wall cover plate on the bin top is opened, and the high-temperature slag falls into the crushing bin and is crushed by the roller structure. The water-cooled wall tube bundles on both sides of the crushing bin, the water-cooled wall cover plate and the heat exchange tube bundle and the water-cooled pumping plate at the lower end of the roller structure absorb heat at the same time.

[0010] When the slag is cooled to the specified temperature, the two halves of the water-cooled pumping plate are pulled out to both sides and opened, and the slag falls into the slag receiving device through the gap between the heat exchange tubes of the heat exchange tube bundle and is transported out. When all the slag has fallen, the two halves of the water-cooled pumping plate are closed in the middle again, and the high-temperature slag falls from the top of the silo again. This cycle works to recover the waste heat of the high-temperature molten slag. The intermittent working mode causes little damage to the tooling, and the main heat exchange tube bundle is in direct contact with the high-temperature slag, which has high heat exchange efficiency and improves the green resource utilization rate of the high-temperature molten slag.

[0011] Compared with the existing conventional high-temperature slag roller crushing bin, the present invention has the following advantages:

[0012] (1) The top of the crushing bin is a water-cooled wall cover, which is preferably a double-door structure, and can be opened or closed according to the crushed slag. When the high-temperature slag enters from the top of the crushing bin, the water-cooled wall cover can absorb the radiant heat of the high-temperature slag, heat the feed water, and play the role of economizer 1.

[0013] (2) A water-cooled roller structure is installed inside the crushing bin, which is configured to be able to translate and rotate along the track, and is used to roll the falling slag. At the same time, a heat exchange tube bundle is installed below the water-cooled roller structure, which can serve as a forced circulation evaporator 1, buried in the high-temperature slag and in full contact with the slag. Below the heat exchange tube bundle, a split-type water-cooled pumping plate is provided to absorb the heat of the high-temperature slag to heat the feed water, playing the role of an economizer 2.

[0014] (3) The membrane-type water-cooled wall structure installed inside the crushing bin, wherein the water-cooled wall tube bundle is installed on the inner side of the crushing bin wall and can serve as an evaporator 2, and together with the water-cooled wall cover plate serving as an economizer 1, form a membrane-type water-cooled wall structure.

[0015] (4) The lower end of the crushing bin is a split-type water-cooled pumping plate, which absorbs the heat of the high-temperature slag to heat the feed water, thus playing the role of economizer 2.

[0016] In addition, the water-cooled pumping plate can be opened, and preferably when pumped horizontally to both sides, the slag will be put into the slag receiving device at the bottom, which can be a slag receiving tank or a slag receiving trolley. When the water-cooled pumping plate is closed, the high-temperature slag will continue to be rolled and heat absorbed in the crushing bin, and work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the crushing bin device of the present invention.

[0018] Figure 2 It is a schematic transverse cross-sectional view of the position of the water-cooling pumping plate of the present invention.

[0019] In the figure: water-cooled roller wheel structure 1, water-cooled pumping plate 2, crushing chamber 3, heat exchange tube bundle 4, slag hopper plate 5, slag receiving device 6, water-cooled wall tube bundle 7, water-cooled wall cover plate 8, roller shaft 9. DETAILED DESCRIPTION

[0020] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] The waste heat recovery device for intermittent roller-pressed high-temperature steel slag includes a water-cooled roller wheel structure 1, a water-cooled pumping plate 2, a membrane water-cooled wall structure, and a heat exchange tube bundle 4; the water-cooled roller wheel structure 1 is installed inside the crushing bin 3, and is used for roller-pressing and crushing the steel slag; the water-cooled pumping plate 2 is fixedly installed below the water-cooled roller wheel structure 1; the membrane water-cooled wall structure is installed on the inner wall of the crushing bin 3, and is used for recovering the waste heat of the high-temperature steel slag around the water-cooled roller wheel structure 1; the heat exchange tube bundle 4 is buried inside the high-temperature steel slag, and is fixedly installed between the water-cooled roller wheel structure 1 and the water-cooled pumping plate 2, and is used for recovering the waste heat of the high-temperature slag around the tube.

[0022] The water-cooled roller structure 1 is a roller structure with a roller shaft passing through, wherein both ends are fixed in the guide rails of the inner wall of the crushing chamber through the roller shaft 9, and can rotate along the circumference of the roller shaft and / or translate along the roller shaft in the guide rails.

[0023] The water-cooled pumping plate 2 is a split-type water-cooled hollow plate structure, which is assembled from two half-plate structures, wherein a circulating water-cooling structure is arranged inside the hollow plate structure, and the structure extends to the outside of the wall of the crushing bin 3 along the vertical section where the slag falls.

[0024] It also includes a slag hopper plate 5 and a slag receiving device 6; the slag hopper plate 5 is fixedly installed below the water-cooled pumping plate 2 to receive the steel slag dropped from the water-cooled pumping plate 2; the slag receiving device 6 is movably arranged below the slag hopper plate 5 to receive the steel slag dropped from the slag hopper plate 5.

[0025] The membrane water-cooled wall structure includes a water-cooled wall tube bundle 7 and a water-cooled wall cover plate 8; the water-cooled wall cover plate 8 is set as an openable structure and installed at the top of the crushing bin to allow high-temperature slag to enter / absorb heat after sealing; the water-cooled wall tube bundle 7 is arranged in multiple groups and distributed side by side on the inner wall of the crushing bin to recover the waste heat of the slag.

[0026] When the crushing heat recovery work is carried out, it is an intermittent working mode, the double-door membrane water-cooled wall cover above the crushing bin 3 is opened (closed when there is no slag to be crushed), and the high-temperature slag enters from above the crushing bin 3. The water-cooled wall cover 8 absorbs the radiant heat of the high-temperature slag, heats the feed water, and plays the role of economizer 1.

[0027] A water-cooled roller structure 1 that can translate and / or rotate along the guide rail is provided in the crushing chamber 3 to crush the high-temperature slag by roller pressing. A heat exchange tube bundle 4 is provided below the roller, which can be used as a forced circulation evaporator 1, buried in the high-temperature slag and in full contact with the slag. A split-type water-cooled pumping plate is provided below the heat exchange tube bundle 4 to absorb the heat of the high-temperature slag to heat the feed water, playing the role of a second economizer.

[0028] The inner side wall of the crushing chamber 3 is arranged with a water-cooled wall tube bundle 7 of a membrane water-cooled wall, which serves as the second evaporator. Both the economizer 1 and the evaporator 2 are membrane water-cooled wall structures. When the slag is cooled to a certain degree, the split water-cooled pumping plates are horizontally pumped to both sides respectively, and the cooled and crushed slag falls into the slag receiving device below, which can be a slag receiving tank, and enters the next stage of the processing process. After the falling is completed, the water-cooled pumping plate 2 is closed, the upper cover plate is opened, and the high-temperature slag is poured into the crushing chamber 3 again. After the pouring is completed, the cover plate is closed, and the roller starts rolling.

[0029] Example 1

[0030] The waste heat recovery device for intermittent roller-pressed high-temperature steel slag includes a water-cooled roller structure, a water-cooled pumping plate, a membrane water-cooled wall structure, and a main heat exchange tube bundle buried in the high-temperature steel slag layer; the water-cooled roller structure is installed inside the crushing bin and can rotate while moving in the horizontal direction, and is used for roller-pressing and crushing the steel slag; the water-cooled pumping plate is installed below the high-temperature steel slag layer, and the left and right halves can be pumped in and out in the horizontal direction respectively for the switch structure; the membrane water-cooled wall structure is installed at the two side walls and the top cover position in the crushing bin, and is arranged along the side wall below the roller, and arranged on both sides where there is no wall above the roller, and is used for waste heat recovery of high-temperature steel slag. When the crushing bin is working, the middle of the two halves of the water-cooled pumping plate is closed, the water-cooled wall cover plate on the top of the bin is opened, and the high-temperature steel slag falls into the crushing bin and is crushed by the roller structure. The water-cooled wall tube bundles on both sides of the crushing bin, the water-cooled wall cover plate, and the main heat exchange tube bundle and water-cooled pumping plate at the lower end of the roller structure absorb heat at the same time. When the slag cools down to the specified temperature, the two halves of the water-cooled pumping plate are pulled out to both sides and opened, and the slag falls into the slag receiving device through the gap between the heat exchange tubes of the main heat exchange tube bundle and is transported out. When all the slag has fallen, the two halves of the water-cooled pumping plate are closed again in the middle, and the high-temperature slag falls from the top of the silo again. This cycle works to recover the waste heat of the high-temperature molten slag. The intermittent working mode causes little damage to the tooling, and the main heat exchange tube bundle directly contacts the high-temperature slag, with high heat exchange efficiency, which improves the green resource utilization rate of the high-temperature molten slag.

[0031] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. Intermittent roller-pressed high-temperature slag waste heat recovery device, characterized by: It comprises a water-cooled roller wheel structure (1), a water-cooled pumping plate (2), a membrane water-cooled wall structure, and a heat exchange tube bundle (4); the water-cooled roller wheel structure (1) is installed inside a crushing bin (3) and is used for roller crushing steel slag; the water-cooled pumping plate (2) is fixedly installed below the water-cooled roller wheel structure (1); the membrane water-cooled wall structure is installed on the inner wall of the crushing bin (3) and is used for recovering the waste heat of the high-temperature steel slag around the water-cooled roller wheel structure (1); the heat exchange tube bundle (4) is buried inside the high-temperature steel slag and is used for recovering the waste heat of the high-temperature steel slag around the heat exchange tube bundle (4); The water-cooled roller structure (1) is a roller structure with a roller shaft passing through it, wherein both ends are fixed in the guide rails of the crushing chamber wall through the roller shaft (9), and can rotate circumferentially along the roller shaft and / or translate in the guide rails along the roller shaft; The water-cooled pumping plate (2) is a split-type water-cooled hollow plate structure, which is assembled from two half plate structures, wherein a circulating water cooling structure is arranged inside the hollow plate structure, and the structure extends along the vertical section where the slag falls to the outside of the wall of the crushing chamber (3); The membrane water-cooled wall structure comprises a water-cooled wall tube bundle (7) and a water-cooled wall cover plate (8); the water-cooled wall cover plate (8) is configured as an openable structure, installed at the top of the crushing chamber (3), and used for the entry of high-temperature steel slag and the absorption of heat after sealing; the water-cooled wall tube bundle (7) is provided in multiple groups, and is distributed side by side on the inner wall of the crushing chamber (3), and is used for the waste heat recovery of the steel slag; When the crushing bin is working, the two halves of the water-cooled pumping plates close toward the middle, the water-cooled wall cover plate on the bin top opens, and the high-temperature slag falls into the crushing bin and is crushed by the roller structure. The water-cooled wall tube bundles on both sides of the crushing bin, the water-cooled wall cover plate and the heat exchange tube bundle at the lower end of the roller structure and the water-cooled pumping plates absorb heat at the same time; when the slag is cooled to the specified temperature, the two halves of the water-cooled pumping plates are respectively drawn out to both sides and opened, and the slag falls into the slag receiving device through the gap between the heat exchange tubes of the main heat exchange tube bundle and is transported out; when all the slag has fallen, the two halves of the water-cooled pumping plates close toward the middle again, and the high-temperature slag falls from the bin top again.

2. The waste heat recovery device for intermittent roller-pressed high-temperature slag according to claim 1 is characterized in that: It also comprises a slag hopper plate (5) and a slag receiving device (6); the slag hopper plate (5) is fixedly mounted below the water-cooled pumping plate (2) and is used to receive the steel slag dropped from the water-cooled pumping plate (2); the slag receiving device (6) is movably arranged below the slag hopper plate (5) and is used to receive the steel slag dropped from the slag hopper plate (5).

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