Blast furnace slag runner with heat preservation function
By introducing a phase change heat storage medium layer into the blast furnace slag trough, the problems of insufficient sensible heat recovery from blast furnace slag and damage to the slag trough are solved, realizing the effective utilization of sensible heat and protection of the slag trough, and ensuring the stability of production.
Patent Information
- Application Number
- CN202520275158.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-03-17
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Insufficient recovery and utilization of sensible heat from blast furnace slag leads to energy waste and damage to the refractory lining of the slag channel. A sudden drop in temperature during slag discharge may cause damage and crystallization of the slag channel, affecting the continuity of production.
The slag trench adopts a U-shaped structure and includes a permanent layer and a working layer. The permanent layer consists of a concrete layer and a first refractory castable layer, while the working layer consists of a phase change heat storage medium layer and a second refractory castable layer. The phase change heat storage medium layer is encapsulated to avoid direct contact with the high-temperature molten slag. It absorbs and stores residual heat by utilizing the phase change heat storage medium to prevent a sudden drop in temperature.
It effectively recovers the sensible heat of blast furnace slag, avoids damage and crystallization of slag trough materials, improves thermal shock resistance, ensures production continuity and reduces repair frequency.
Smart Images
Figure CN224001446U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of blast furnace slag treatment, specifically relating to a blast furnace slag ditch with heat preservation function. Background Technology
[0002] Blast furnace slag is a byproduct formed during blast furnace smelting from gangue in the ore, ash in the fuel, and non-volatile components in the flux. The tapping temperature of blast furnace slag is >1500℃, and the heat contained in 1 ton of blast furnace slag is equivalent to 64 kg of standard coal. The recovery and utilization of sensible heat from blast furnace slag not only reduces energy consumption in steel production but also reduces pollutant emissions.
[0003] The blast furnace slag ditch is a crucial channel for the timely discharge of high-temperature slag, and it is an extremely important part of the blast furnace production process. With the continuous development of the steel industry, the handling of blast furnace slag has encountered numerous problems. As blast furnace smelting technology advances, the iron output from blast furnaces increases rapidly, leading to higher slag temperatures. During the slag removal process, a significant amount of residual heat from the slag is dissipated into the environment, resulting in substantial energy waste.
[0004] Furthermore, the rapid increase in iron output from blast furnace ironmaking has led to increasingly harsh operating conditions for refractory linings in slag channels due to the rising slag temperature. Damage to the swirling areas at the junctions of slag channels is becoming more pronounced. Moreover, the sudden drop in slag channel temperature during the slag tapping intervals can cause shrinkage cracking, requiring frequent repairs to maintain production. Summary of the Invention
[0005] The purpose of this utility model is to provide a blast furnace slag trough with heat preservation function, which can effectively utilize the heat storage function of phase change heat storage material and the characteristic of constant temperature during phase change process, effectively recover the sensible heat of blast furnace slag, and avoid damage to the surface material of slag trough during slag discharge and crystallization of slag on the surface after slag discharge.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] A blast furnace slag trench with heat preservation function includes: a trench body with a U-shaped structure, and a permanent layer and a working layer arranged sequentially from the outside to the inside; wherein, the permanent layer includes a concrete layer and a first refractory castable layer; the working layer includes a phase change heat storage medium layer with heat storage function and a second refractory castable layer; and a trench cover is provided at the open end of the trench body.
[0008] Preferably, the first refractory castable layer of the permanent layer is provided with a steel reinforcement frame and is cast into shape.
[0009] Preferably, a lifting ring is also provided, which is welded to the steel keel as a whole.
[0010] Preferably, the phase change heat storage medium is encapsulated to prevent leakage and corrosion, and the increased specific surface area of the capsule has a greater advantage in heat transfer and heat storage.
[0011] Preferably, the trench cover is filled with insulating cotton.
[0012] Furthermore, a temperature sensor is installed on the second refractory castable layer at the bottom center of the slag ditch body to facilitate the measurement of the temperature of the high-temperature molten slag.
[0013] Preferably, the temperature sensor is a corundum tube S-type thermocouple.
[0014] In the blast furnace slag trough with heat preservation function described in this utility model:
[0015] The slag ditch body includes a permanent layer and a working layer. The working layer is equipped with a phase change heat storage medium layer with heat storage function. The phase change heat storage medium can fully absorb and store the residual heat of high-temperature molten slag and maintain a constant temperature.
[0016] The side of the high-temperature molten slag that comes into contact with the slag groove is made of refractory castable material, and the high-temperature molten slag does not come into direct contact with the phase change heat storage medium.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] The blast furnace slag trough with heat preservation function described in this utility model is filled with a phase change heat storage medium. During slag discharge, the phase change heat storage medium can fully absorb and store the residual heat of the high-temperature molten slag and maintain a constant temperature, preventing excessively high temperatures at the slag-material interface and improving thermal shock resistance. When slag discharge stops, the phase change heat storage medium gradually releases heat outward, preventing shrinkage and cracking caused by excessive cooling of the slag trough surface and preventing molten slag from solidifying and forming a layer on the surface. This facilitates repair and dismantling and provides excellent construction performance. Attached Figure Description
[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation
[0020] See Figure 1 The blast furnace slag trough with heat preservation function described in this utility model includes:
[0021] The slag ditch body 10 has a U-shaped structure, with a permanent layer 1 and a working layer 2 arranged sequentially from the outside to the inside; wherein, the permanent layer 1 includes a concrete layer 11 and a first refractory castable layer 12; the working layer 2 includes a phase change heat storage medium layer 21 with heat storage function and a second refractory castable layer 22.
[0022] The trench cover 20 is disposed at the open end of the slag trench body 10. Preferably, a sealing filler 30 is provided between the trench cover 20 and the slag trench body 10.
[0023] Preferably, the first refractory castable layer 12 of the permanent layer 1 is provided with a steel reinforcement keel and is cast in one piece.
[0024] Preferably, a lifting ring 3 is also provided, which is welded to the steel keel as a whole.
[0025] Preferably, the phase change heat storage medium is encapsulated in capsules.
[0026] Furthermore, a temperature sensor 4 (corundum tube S-type thermocouple) is installed on the second refractory castable layer 22 at the bottom center of the slag ditch body 10 to facilitate the measurement of the temperature of the high-temperature molten slag 100.
[0027] Preferably, the trench cover 20 is filled with thermal insulation cotton.
[0028] The second refractory castable layer of the working layer protects the phase change thermal storage medium while simultaneously conducting heat, transferring the residual heat of the high-temperature molten slag to the phase change thermal storage medium. The phase change thermal storage medium effectively absorbs and stores the residual heat of the high-temperature molten slag, maintaining a constant temperature and preventing excessively high temperatures at the slag-material interface. When the system stops discharging slag, the phase change thermal storage medium gradually releases heat outward, preventing shrinkage cracking and slag solidification on the surface due to excessive cooling of the slag channel surface.
Claims
1. A blast furnace slag runner with heat retaining function, characterized in that, The application relates to a slag channel body, a slag channel cover and a slag channel. The slag channel body is in a U-shaped structure and is sequentially provided with a permanent layer and a working layer from outside to inside; the permanent layer comprises a concrete layer and a first refractory castable layer; the working layer comprises a phase change heat storage medium layer with heat storage function and a second refractory castable layer. The slag channel cover is arranged at the opening end of the slag channel body.
2. The heat retaining cinder channel for a blast furnace as claimed in claim 1, wherein The first refractory castable layer of the permanent layer is internally provided with a steel reinforcement batten and is cast and formed.
3. The heat retaining cinder channel for a blast furnace as claimed in claim 2, wherein A hoisting ring is further arranged and is integrally welded with the steel reinforcement batten.
4. The heat retaining cinder channel for a blast furnace according to claim 1, wherein The phase change heat storage medium adopts a capsule packaging mode.
5. The heat retaining cinder channel for a blast furnace according to claim 1, wherein The slag channel cover is internally filled with heat insulation cotton.
6. The heat retaining cinder channel for a blast furnace according to claim 1, wherein A temperature sensor is arranged on the second refractory castable layer at the central bottom of the slag channel body.
7. The heat retaining cinder channel for a blast furnace as claimed in claim 6, wherein The temperature sensor is a corundum tube S-type thermocouple.
8. The heat retaining cinder channel for a blast furnace according to claim 1, wherein Sealing filler is arranged between the slag channel cover and the slag channel body.