Energy-saving blast furnace slag runner using phase-change material

Abstract

The utility model relates to an energy-saving blast furnace slag runner utilizing a phase-change material. The slag runner is sequentially provided with a refractory brick layer, a phase-change material layer and a wear-resistant layer from outside to inside, wherein the refractory brick layer is designed to be of a hollow structure, a waste heat recovery water pipe is arranged in the refractory brick layer, and a water inlet and a water outlet of the waste heat recovery water pipe are located outside the slag discharging trough. The phase change material is utilized, the problem that refractory materials are prone to corrosion and abrasion is solved, meanwhile, heat can be absorbed, and energy waste is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace slag ditch technology, specifically relating to an energy-saving blast furnace slag ditch utilizing phase change materials. Background Technology

[0002] In blast furnace ironmaking, the slag discharge ditch, serving as a channel for the timely discharge of high-temperature slag, is an indispensable part of the blast furnace tapping system. It is typically constructed using casting or ramming of aluminum, silicon carbide, or carbon refractories. The primary function of the slag discharge ditch is to separate and transport the silica slag produced during blast furnace ironmaking. This slag is highly corrosive at high temperatures, potentially causing severe damage to the slag discharge ditch, thereby increasing energy and cost consumption. Therefore, measures must be taken to ensure the slag discharge ditch's resistance to high temperatures and corrosion.

[0003] With the further intensification of blast furnace smelting technology, the iron output has increased dramatically, and the slag temperature has risen significantly. This has placed the refractory materials in the slag troughs under increasingly harsh operating conditions, resulting in a more rapid rate of refractory material wear. Furthermore, during iron tapping intervals, the slag troughs experience shrinkage and cracking due to the rapid temperature drop, requiring frequent repairs and maintenance to maintain production stability. These challenges have a significant impact on the normal operation and production efficiency of blast furnaces.

[0004] Currently, the refractory materials inside the slag trench are prone to corrosion and wear due to long-term exposure to high temperature and corrosive environment, which affects the service life and performance of the facility.

[0005] In addition, molten slag may solidify and clog slag channels during the flow process, leading to obstruction of molten slag discharge and even damage to facilities. Summary of the Invention

[0006] The purpose of this invention is to design an energy-saving blast furnace slag discharge ditch that utilizes phase change materials. By using phase change materials, the problem of easy corrosion and wear of refractory materials can be solved, while absorbing heat and reducing energy waste can be addressed.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] An energy-saving blast furnace slag discharge ditch utilizing phase change materials is provided, wherein the slag discharge ditch is provided with a refractory brick layer, a phase change material layer, and a wear-resistant layer in sequence from the outside to the inside; wherein the refractory brick layer is designed as a hollow structure, and a waste heat recovery water pipe is provided inside, with the inlet and outlet of the waste heat recovery water pipe located outside the slag discharge ditch respectively.

[0009] Preferably, a waste heat recovery cover is provided on the opening side of the slag discharge ditch, and a second waste heat recovery water pipe is provided in the waste heat recovery cover.

[0010] Preferably, the bottom surface of the wear-resistant layer is provided with a stacking structure.

[0011] Preferably, the wear-resistant layer is a wear-resistant liner, and preferably, the wear-resistant liner is detachable.

[0012] Preferably, the surface of the wear-resistant liner is provided with a high-temperature anti-corrosion layer.

[0013] Preferably, the anti-stacking structure is a high-temperature turbulence-resistant band. Preferably, the high-temperature turbulence-resistant band is equidistantly arranged on the wear-resistant layer, and the bottom of the high-temperature turbulence-resistant band is in close contact with the wear-resistant layer (wear-resistant liner). The equidistantly arranged high-temperature turbulence-resistant band can effectively increase the turbulence of the high-temperature slag flow, increase the temperature of the bottom slag, and improve the overall fluidity of the slag.

[0014] Preferably, the phase change material of the phase change material layer is sodium carbonate modified steel slag.

[0015] In the energy-saving blast furnace slag discharge ditch described in this utility model:

[0016] This invention features a phase change material layer with a waste heat recovery water pipe installed in the refractory brick layer. Room temperature water is introduced into the inlet of the water pipe, and the heat stored in the phase change material heats the water in the pipe before it flows out from the outlet, thus achieving efficient recovery of waste heat from blast furnace slag.

[0017] This invention preferably uses sodium carbonate-modified steel slag as the phase change material in the blast furnace slag discharge ditch, with a phase change temperature T. xb Phase transformation temperature T of blast furnace slag glz Same, that is, T xb =T glz .

[0018] The phase change temperature of the phase change material refers to the temperature at which the phase change material (sodium carbonate modified steel slag) absorbs or releases heat, begins to undergo a phase change, and maintains a certain temperature.

[0019] The phase transformation temperature of blast furnace slag refers to the temperature at which blast furnace slag changes from a liquid state to a solid state. During the process of changing from a liquid state to a solid state, the fluidity of blast furnace slag decreases.

[0020] During the blast furnace slag flow process, the temperature of the blast furnace slag is T. During the slag tapping stage, when the blast furnace slag enters the slag trough, T ≥ T0. xb The phase change material (sodium carbonate modified steel slag) absorbs heat released by the blast furnace slag from the wear-resistant layer (wear-resistant lining, anti-stacking structure) through heat conduction and stores the absorbed heat. During the blast furnace slag flow, the internal heat of the blast furnace slag is gradually stored in the phase change material, causing the temperature of the blast furnace slag itself to gradually decrease. When T≤T xbDuring the initial phase change process (PDP), the sodium carbonate-modified steel slag cannot absorb the heat from the blast furnace slag, causing it to solidify and become immobile due to its low temperature. In this case, the PDP can provide heat to the blast furnace slag, raising its temperature to the PDP temperature and allowing it to continue flowing. During the slag-stopping phase, the PDP can also provide heat to the wear-resistant layer (wear-resistant liner), preventing it from cooling down rapidly and extending its service life.

[0021] The above design ensures efficient recovery of waste heat from blast furnace slag while preventing the slag from becoming solid and unable to flow in the slag ditch due to low temperature.

[0022] In addition, the wear-resistant layer described in this invention can be used to protect phase change materials from wear and corrosion caused by blast furnace slag.

[0023] The waste heat recovery cover plate can absorb the heat radiated and transferred to the upper air by blast furnace slag during its flow in the slag ditch. Waste heat recovery water pipes are installed in the waste heat recovery cover plate, and the water in the waste heat recovery water pipes can effectively recover the heat radiated and transferred by blast furnace slag.

[0024] The anti-stacking structure can effectively promote the flow of blast furnace slag and prevent its accumulation.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] The blast furnace slag discharge ditch of this utility model is designed with a phase change material layer, using phase change material (sodium carbonate modified steel slag) as the casting material. The phase change material has a large heat capacity and can stably circulate and release heat. It absorbs a large amount of heat during slag discharge and releases heat to the wear-resistant layer (wear-resistant liner) in the intermittent section, avoiding the rapid cooling of the residual slag on the wear-resistant layer (wear-resistant liner) and causing wear and corrosion. At the same time, water is used to absorb heat, reducing energy waste. Attached Figure Description

[0027] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0028] Figure 2 This is a front view of an embodiment of the present utility model. Detailed Implementation

[0029] See Figure 1 , Figure 2The present invention describes an energy-saving blast furnace slag discharge ditch utilizing phase change materials. The slag discharge ditch 100 is provided with a refractory brick layer 1, a phase change material layer 2, and a wear-resistant layer 3 arranged sequentially from the outside to the inside. The refractory brick layer 1 is designed as a hollow structure, with a waste heat recovery water pipe inside. The inlet 41 and outlet 42 of the waste heat recovery water pipe are located outside the slag discharge ditch.

[0030] Furthermore, a waste heat recovery cover plate 5 is provided on the opening side of the slag discharge ditch 1, and a second waste heat recovery water pipe 51 is provided in the waste heat recovery cover plate 5.

[0031] Preferably, the bottom surface of the wear-resistant layer 3 is provided with a stacking structure 6.

[0032] Preferably, the wear-resistant layer 3 is a wear-resistant liner, and preferably, the wear-resistant liner is detachable. In this embodiment, bolts 7 are used to connect the wear-resistant liner and the phase change material layer 2.

[0033] Preferably, the surface of the wear-resistant liner is provided with a high-temperature anti-corrosion layer.

[0034] Preferably, the anti-stack structure 6 is a high-temperature resistant turbulence zone, which is equidistantly arranged on the wear-resistant layer, and the bottom of the high-temperature resistant turbulence zone is in close contact with the wear-resistant layer (wear-resistant liner).

[0035] Preferably, the phase change material of the phase change material layer 2 is sodium carbonate modified steel slag.

[0036] The waste heat recovery water pipe in the refractory brick layer is filled with room temperature water. The heat stored in the phase change material heats the water in the pipe, which then flows out from the outlet, completing the efficient recovery of waste heat from the blast furnace slag. The waste heat recovery cover absorbs the heat radiated upwards by the blast furnace slag during its flow in the slag ditch, and the water in the waste heat recovery water pipe installed in the waste heat recovery cover effectively recovers the heat radiated by the blast furnace slag.

Claims

1. An energy saving type slag notch of a blast furnace using a phase change material, characterized by, The slag notch is sequentially provided with a refractory brick layer, a phase change material layer and a wear-resistant layer from outside to inside; the refractory brick layer is designed as a hollow structure, and a waste heat recovery water pipe is arranged inside, and the water inlet and outlet of the waste heat recovery water pipe are respectively located outside the slag notch.

2. The energy saving furnace slag notch using a phase change material according to claim 1, wherein The opening side of the slag notch is provided with a waste heat recovery cover plate, and a second waste heat recovery water pipe is arranged in the waste heat recovery cover plate.

3. The energy saving furnace slag notch using a phase change material according to claim 1, wherein An anti-piling structure is arranged on the inner bottom surface of the wear-resistant layer.

4. The energy saving furnace slag notch using a phase change material according to claim 3, characterized in that, The anti-piling structure is a high-temperature resistant spoiler belt.

5. The energy saving furnace slag notch using a phase change material according to claim 4, wherein The high-temperature resistant spoiler belts are equidistantly arranged on the wear-resistant layer.

6. The energy-saving furnace slag notch using a phase change material according to claim 1 or 3, wherein The wear-resistant layer is a wear-resistant lining plate.

7. The energy saving furnace slag notch using a phase change material according to claim 6, wherein The wear-resistant lining plate is detachable.

8. The energy saving furnace slag notch using a phase change material according to claim 6, wherein A high-temperature corrosion-resistant layer is arranged on the surface of the wear-resistant lining plate.

9. The energy saving furnace slag notch using a phase change material according to claim 7, wherein A high-temperature corrosion-resistant layer is arranged on the surface of the wear-resistant lining plate.

10. The energy saving furnace slag notch using a phase change material according to claim 1, wherein The phase change material of the phase change material layer is sodium carbonate modified steel slag.

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