Heat recovery device for electric arc furnace

Abstract

The utility model provides a heat recovery device for an electric arc furnace, which is characterized in that the electric arc furnace is provided with a heat recoverer, the heat recoverer is connected with the electric arc furnace and used for recovering heat on the surface of the electric arc furnace, the heat recovery device is further provided with a raw material preheating device, and the raw material preheating device is connected with a feeding system of the electric arc furnace. Raw materials of the electric arc furnace are preheated through the raw material preheating device and then enter the electric arc furnace, the heat recoverer is connected with the raw material preheating device, the heat recoverer conveys heat recovered by the heat recoverer to the raw material preheating device, heat recycling of the electric arc furnace is achieved, and energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of metallurgical equipment, in particular to a heat recovery device for an electric arc furnace. Background Art

[0002] An electric arc furnace is an important device in steel smelting and is widely used for melting metal raw materials such as scrap steel and ferroalloys. However, during the high-temperature operation of the electric arc furnace, a large amount of waste heat is generated. If this heat is not utilized, it will be dissipated through the furnace wall and other channels, resulting in energy waste.

[0003] In order to improve the energy efficiency of the electric arc furnace, the present application proposes a heat recovery device for an electric arc furnace. Summary of the Utility Model

[0004] The purpose of the utility model is to address the deficiencies in the above technologies by providing a heat recovery device for an electric arc furnace, which recovers the heat on the surface of the electric arc furnace and uses it for raw material preheating to improve energy efficiency.

[0005] The purpose of the utility model is achieved as follows: It includes an electric arc furnace and a heat recovery device. The heat recovery device is connected to the electric arc furnace and is used to recover the heat on the surface of the electric arc furnace;

[0006] A raw material preheating device, which is connected to the feeding system of the electric arc furnace. The raw materials of the electric arc furnace are preheated by the raw material preheating device and then enter the electric arc furnace;

[0007] The heat recovery device is connected to the raw material preheating device, and the heat recovered by the heat recovery device is transported to the raw material preheating device.

[0008] In the above structure, the heat recovery device includes a heat absorption pipeline made of a spiral plate outside the electric arc furnace. A first heat insulation layer is provided outside the heat absorption pipeline, and a housing is provided outside the first heat insulation layer. The housing is provided with a first joint and a second joint, which are respectively connected to both ends of the heat absorption pipeline;

[0009] Furthermore, it also includes a circulation device, which is connected between the heat recovery device and the raw material preheating device to transport the water in the heat absorption pipeline to the raw material preheating device.

[0010] In the above structure, the raw material preheating device includes a box body. Multiple layers of material plates are provided inside the box body. The material plates are spaced apart on two opposite surfaces of the box body, so that the raw materials pass through each layer of material plates layer by layer from top to bottom. The material plates are connected to the box body by bolts. The material plates are inclined, and heat dissipation pipes are wound at the bottom of the material plates.

[0011] In the above structure, an installation frame is provided at the lower part of the box body. The installation frame is fixedly arranged, and is elastically connected between the installation frame and the box body. A vibration motor is connected to the outside of the box body.

[0012] In the above structure, a spring shaft is provided at the lower part of the box body. The spring shaft is fixedly connected to the box body. A spring sleeve corresponding to the spring shaft is provided on the mounting frame, and the spring sleeve is sleeved on the spring shaft.

[0013] Furthermore, the spring sleeve is provided with a shaft hole, the spring shaft is matched with the shaft hole, and one end of the spring shaft protrudes out of the shaft hole and is provided with an anti-detachment pin.

[0014] In the above structure, a second heat preservation layer is provided outside the box body to reduce heat loss through the second heat preservation layer.

[0015] In the above structure, an adjusting device is further provided. The adjusting device includes a temperature sensor, a flow control valve and a controller.

[0016] Among them, each of the raw material preheating device and the heat recovery device is provided with a temperature sensor. The controller is used to collect the temperature data of the temperature sensor and control the operation of the flow control valve based on the temperature data.

[0017] The beneficial effects of the present utility model: The heat on the surface of the furnace body is transported to the raw material preheating device through the heat recovery device, realizing the heat recovery and utilization of the electric arc furnace and improving energy efficiency; the raw material preheating device is provided with multiple layers of material plates, and heat dissipation pipes are arranged at the bottom of the material plates to heat the raw materials in the raw material preheating device layer by layer, realizing efficient preheating. And the raw material preheating device is provided with a vibration motor, and during the working process, it is always in a vibrating state to prevent material accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall connection structure of the heat recovery device of the present utility model;

[0019] Figure 2 is a schematic cross-sectional structure diagram of the raw material preheating device of the present utility model;

[0020] Figure 3 is a schematic diagram of the connection structure between the box body and the mounting frame of the present utility model;

[0021] Figure 4 is a schematic cross-sectional structure diagram of the heat recovery device of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present application provides a heat recovery device for an electric arc furnace. A heat recovery device is provided on the furnace body of the electric arc furnace. The heat on the surface of the electric arc furnace is recovered by the heat recovery device and transferred to the raw material preheating device. When the raw materials pass through the raw material preheating device, the raw materials will be heated, solving the problem of waste of the heat on the surface of the electric arc furnace in the prior art and improving the efficiency. And a vibration motor is provided in the raw material preheating device to prevent material blockage.

[0023] The following further explains this embodiment with reference to the drawings:

[0024] As can be seen from Figure 1 — Figure 4 this application includes an electric arc furnace 1 and a heat recovery device 2. The heat recovery device 2 is connected to the electric arc furnace 1 and is used to recover the heat on the surface of the electric arc furnace 1. In this embodiment, the heat recovery device 2 includes a heat absorption pipeline 210 with a spiral plate made outside the electric arc furnace. A first heat insulation layer 220 is provided outside the heat absorption pipeline 210, and a housing 230 is provided outside the first heat insulation layer 220. The housing 230 is provided with a first joint 231 and a second joint 232. The first joint 231 and the second joint 232 are respectively connected to both ends of the heat absorption pipeline 210 and are used to connect to external pipelines.

[0025] A raw material preheating device 3 is provided. The raw material preheating device 3 is connected to the feeding system of the electric arc furnace 1. The raw materials of the electric arc furnace 1 enter the electric arc furnace 1 after being preheated by the raw material preheating device 3. The heat recovery device 2 is connected to the raw material preheating device 3, and the heat recovered by the heat recovery device 2 is transported to the raw material preheating device 3.

[0026] Among them, a circulation device 4 is further included in the pipeline connecting the heat recovery device 2 and the raw material preheating device 3. The circulation device 4 transports the hot water in the heat absorption pipeline 210 to the raw material preheating device 3. The circulation device 4 includes a water tank, and a water pump is provided in the water tank. Pressure is provided by the water pump to make the water flow, so as to realize the transportation of heat.

[0027] On the basis of the above embodiment, preferably, the raw material preheating device 3 includes a box body 310. A plurality of layers of material plates 320 are provided inside the box body 310. The material plates 320 are arranged at intervals on two opposite sides of the box body 310, so that the raw materials pass through each layer of material plates 320 layer by layer from top to bottom. The material plates 320 are connected to the box body 310 by bolts. The material plates 320 are inclined, and heat dissipation pipes 330 are wound at the bottom of the material plates 320.

[0028] As Figure 2 shown, a total of five layers of material plates 320 are provided in this embodiment. The raw materials slide from the upper layer of material plate 320 to the lower layer of material plate 320. Heat dissipation pipes 330 are provided below each layer of material plate 320, and each will heat the raw materials, making the raw materials heated evenly. The material plates 320 are arranged at a certain inclination angle, so that the raw materials have a certain residence time on each layer of material plate 320, so as to be fully preheated and avoid material accumulation to a certain extent.

[0029] On the basis of the above embodiment, preferably, an installation frame 5 is provided at the lower part of the box body 310. The installation frame 5 is fixedly arranged, and is elastically connected between the installation frame 5 and the box body 310. A vibration motor 6 is connected to the outside of the box body 310.

[0030] Among them, a spring shaft 311 is provided at the lower part of the box body 310. The spring shaft 311 is fixedly connected to the box body 310. A spring sleeve 312 corresponding to the spring shaft 311 is provided on the mounting bracket 5. A spring 7 is sleeved on the spring shaft 311 and the spring sleeve 312.

[0031] Further, the spring sleeve 312 is provided with a shaft hole. The spring shaft 311 is matched with the shaft hole. One end of the spring shaft 311 protrudes out of the shaft hole and is provided with an anti-detaching pin 313.

[0032] As Figure 3 shown, the elastic connection structure in this embodiment can not only meet the requirement that the box body 310 vibrates along with the vibration motor 6 during operation to prevent material accumulation, but also ensure safety and prevent danger caused by the detachment of the box body 310 during the vibration process.

[0033] On the basis of the above embodiment, preferably, a second heat insulation layer 315 is provided outside the box body 310 to reduce heat loss through the second heat insulation layer 315.

[0034] On the basis of the above embodiment, preferably, an adjusting device is further provided. The adjusting device includes a temperature sensor 810, a flow control valve 820, and a controller.

[0035] Among them, each of the raw material preheating device 3 and the heat recovery device 2 is provided with a temperature sensor 810. The controller is used to collect the temperature data of the temperature sensor 810 and control the operation of the flow control valve 820 based on the temperature data, so as to grasp the heat recovery and utilization situation in real time and facilitate corresponding adjustments.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims

1. A heat recovery device for an electric arc furnace, comprising an electric arc furnace, characterized in that: Also includes: A heat recovery device, the heat recovery device is connected to the electric arc furnace and is used to recover heat from the surface of the electric arc furnace; A raw material preheating device, wherein the raw material preheating device is connected to the feeding system of the electric arc furnace, and the raw material of the electric arc furnace is preheated by the raw material preheating device before entering the electric arc furnace; The heat recovery device is connected to the raw material preheating device, and the heat recovery device transmits the recovered heat to the raw material preheating device.

2. A heat recovery device for an electric arc furnace according to claim 1, characterized in that: The heat recovery device comprises a heat absorbing pipeline spirally coiled on the outside of the electric arc furnace, a first heat-insulating layer is arranged outside the heat absorbing pipeline, a shell is arranged outside the first heat-insulating layer, and a first joint and a second joint are arranged on the shell, which are respectively connected to the two ends of the heat absorbing pipeline; It also includes a circulation device, which is connected between the heat recovery device and the raw material preheating device to transport the water in the heat absorption pipeline to the raw material preheating device.

3. The heat recovery device for an electric arc furnace according to claim 2, characterized in that: The raw material preheating device includes a box body, and multiple layers of material plates are arranged inside the box body. The material plates are arranged at intervals on two opposite surfaces of the box body, so that the raw materials pass through each layer of material plates layer by layer from top to bottom. The material plates are connected to the box body by bolts. The material plates are arranged obliquely, and heat dissipation pipes are coiled on the bottom of the material plates.

4. A heat recovery device for an electric arc furnace according to claim 3, characterized in that: A mounting frame is provided at the lower part of the box body, the mounting frame is fixedly arranged, the mounting frame is elastically connected to the box body, and a vibration motor is connected to the outside of the box body.

5. The heat recovery device for an electric arc furnace according to claim 4, characterized in that: A spring shaft is provided at the lower part of the box body, the spring shaft is fixedly connected to the box body, a spring sleeve is provided on the mounting frame corresponding to the spring shaft, and the spring sleeve is mounted on the spring shaft and the spring sleeve; The spring sleeve is provided with an axial hole, the spring shaft matches the axial hole, one end of the spring shaft protrudes out of the axial hole and is provided with an anti-dropping pin.

6. A heat recovery device for an electric arc furnace according to claim 3, 4 or 5, characterized in that: A second heat-insulating layer is arranged outside the box body, and heat loss is reduced through the second heat-insulating layer.

7. The heat recovery device for an electric arc furnace according to claim 1, characterized in that: A regulating device is also provided, which comprises a temperature sensor, a flow control valve and a controller; Among them, the raw material preheating device and the heat recovery device are each equipped with a temperature sensor, and the controller is used to collect temperature data of the temperature sensor and control the operation of the flow control valve based on the temperature data.

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