Electric furnace smelting system capable of utilizing off-peak electricity for production

Abstract

The utility model relates to an electric furnace smelting system capable of utilizing off-peak electricity for production, which comprises an electric furnace provided with an oxygen blowing unit, and further comprises a first oxygen supply mechanism which comprises a liquid oxygen storage device and a gasifier. The liquid oxygen storage device is connected with a liquid oxygen inlet of the gasifier through a liquid oxygen conveying pipeline, an oxygen outlet of the gasifier is communicated with an oxygen inlet of the oxygen blowing unit through a first oxygen conveying pipeline, and a first valve control unit is arranged on the first oxygen conveying pipeline. The liquid oxygen storage device is used for storing the liquid oxygen, the gasifier is used for gasifying the liquid oxygen and then supplying the liquid oxygen to the electric furnace, continuous oxygen supply to the electric furnace can be achieved, intermittent oxygen supply to the electric furnace can also be achieved, use flexibility is high, an electric furnace smeltery can conduct off-peak smelting production through off-peak electricity, production cost is reduced, and production efficiency is improved. The electric furnace steelmaking benefit is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric furnace production, and in particular relates to an electric furnace smelting system which can utilize valley electricity for production. Background Art

[0002] Electric furnace steelmaking is the core equipment of the short-process steelmaking process. It has irreplaceable advantages over converter steelmaking. It has the characteristics of simple equipment, compact process layout, small footprint, low investment, short construction period, high scrap steel utilization rate, low resource consumption, low three waste emissions, and environmental friendliness. In some areas where industrial electricity prices are high, power resources are tight, or energy consumption dual control, production restrictions and power restrictions are prominent, many companies choose to stagger production in electric furnaces and take advantage of valley electricity prices to reduce production costs and improve the benefits of electric furnace steelmaking.

[0003] However, the deep-cold oxygen production unit used to supply the oxygen required for electric furnace smelting cannot be started and stopped frequently, and therefore cannot adapt to the staggered production of the electric furnace. Utility Model Content

[0004] The utility model relates to an electric furnace smelting system which can utilize valley electricity for production, and can at least solve some defects of the prior art.

[0005] The utility model relates to an electric furnace smelting system which can utilize valley electricity for production, comprising an electric furnace, wherein the electric furnace is provided with an oxygen blowing unit, and further comprising a first oxygen supply mechanism, wherein the first oxygen supply mechanism comprises a liquid oxygen storage device and a vaporizer, wherein the liquid oxygen storage device is connected to the liquid oxygen inlet of the vaporizer through a liquid oxygen delivery pipeline, and the oxygen outlet of the vaporizer is communicated with the oxygen inlet of the oxygen blowing unit through a first oxygen delivery pipeline, and a first valve control unit is provided on the first oxygen delivery pipeline.

[0006] As one of the embodiments, the electric furnace smelting system also includes a second oxygen supply mechanism, which includes an oxygen generator unit. The oxygen outlet of the oxygen generator unit is connected to the oxygen inlet of the oxygen blowing unit through a second oxygen delivery pipeline, and a second valve control unit is provided on the second oxygen delivery pipeline.

[0007] As one of the implementation modes, the first oxygen delivery pipeline is further connected in series with an oxygen buffer device.

[0008] As one of the implementation modes, the oxygen buffer device includes an oxygen storage tank.

[0009] As one of the implementation modes, the first valve control unit includes a pressure regulating valve group, and the oxygen buffer device is located upstream of the pressure regulating valve group.

[0010] As one of the implementation manners, the high-temperature medium inlet of the vaporizer is connected to the electric furnace flue gas conveying pipeline of the electric furnace.

[0011] As one of the implementation manners, the electric furnace flue gas conveying pipeline is connected to the vaporizer after being sequentially connected in series with a combustion sedimentation chamber, a waste heat boiler, and a dust removal device.

[0012] As one of the implementation manners, the first valve control unit includes a stop valve, a check valve, and a pressure regulating valve group, and the stop valve, the check valve, and the pressure regulating valve group are arranged in sequence along the oxygen conveying direction.

[0013] As one of the implementation manners, a liquid delivery pump is provided on the liquid oxygen delivery pipeline.

[0014] As one of the implementation manners, the liquid oxygen storage device includes a liquid oxygen storage tank.

[0015] The utility model has at least the following beneficial effects:

[0016] In the utility model, the liquid oxygen storage device is used to store liquid oxygen, and the vaporizer is used to vaporize the liquid oxygen for use in the electric furnace. It can not only continuously supply oxygen to the electric furnace but also intermittently supply oxygen to the electric furnace, with high flexibility in use. This enables the electric furnace smelting plant to use off-peak electricity for peak-shifting smelting production, reducing production costs and improving the efficiency of electric furnace steelmaking. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the electric furnace smelting system provided by the embodiment of the present utility model. Detailed Embodiments

[0019] The following clearly and completely describes the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0020] Such as Figure 1An embodiment of the utility model provides an electric furnace smelting system that can utilize valley electricity for production, including an electric furnace, which is equipped with an oxygen blowing unit 8; it also includes a first oxygen supply mechanism, which includes a liquid oxygen storage device 3 and a vaporizer 5, the liquid oxygen storage device 3 is connected to the liquid oxygen inlet of the vaporizer 5 through a liquid oxygen delivery pipeline, the oxygen outlet of the vaporizer 5 is connected to the oxygen inlet of the oxygen blowing unit 8 through a first oxygen delivery pipeline, and a first valve control unit is provided on the first oxygen delivery pipeline.

[0021] In one embodiment, the liquid oxygen storage device 3 comprises a liquid oxygen storage tank.

[0022] Optionally, liquid oxygen is transported to the electric furnace smelting plant via a cryogenic liquid transport vehicle 1, wherein the above-mentioned liquid oxygen storage device 3 can be equipped with a tank filling truck pump 2, or the cryogenic liquid transport vehicle 1 can be equipped with a tank filling truck pump 2, and the liquid oxygen on the cryogenic liquid transport vehicle 1 can be transported to the liquid oxygen storage device 3 via the tank filling truck pump 2.

[0023] Optionally, there can be multiple liquid oxygen storage tanks to fully meet the liquid oxygen consumption required for electric furnace smelting and ensure the reliability and safety of electric furnace smelting production.

[0024] Alternatively, if Figure 1 The liquid oxygen delivery pipeline is provided with a liquid delivery pump 4, which can pressurize the liquid oxygen to a set pressure and then deliver it to the vaporizer 5.

[0025] In the gasifier 5, an endothermic gasification method may be adopted.

[0026] In this embodiment, the liquid oxygen storage device 3 is used to store liquid oxygen, and the vaporizer 5 is used to vaporize the liquid oxygen and supply it to the electric furnace. This can realize both continuous and intermittent oxygen supply to the electric furnace. It has high flexibility in use, so that the electric furnace smelter can use valley electricity to carry out off-peak smelting production, reduce production costs, and improve the efficiency of electric furnace steelmaking.

[0027] In one embodiment, the electric furnace smelting system also includes a second oxygen supply mechanism, which includes an oxygen generator, and the oxygen outlet of the oxygen generator is connected to the oxygen inlet of the oxygen blowing unit 8 through a second oxygen delivery pipeline, and a second valve control unit is provided on the second oxygen delivery pipeline.

[0028] Based on this solution, when the first oxygen supply mechanism and the second oxygen supply mechanism are configured at the same time, either liquid oxygen or an oxygen generator can be used as the oxygen source, so that the electric furnace can meet the production requirements under different working conditions and effectively improve the reliability of the electric furnace smelting production.

[0029] In one embodiment, if Figure 1, an oxygen buffer device 6 is also connected in series on the first oxygen delivery pipeline. Through this oxygen buffer device 6, the fluctuation of oxygen consumption during the electric furnace smelting process can be balanced, the production paces of the gasifier 5 and the electric furnace can be reliably coordinated, and the production smoothness can be ensured. The oxygen buffer device 6 includes, but is not limited to, an oxygen storage tank, which can be in the form of a spherical tank, etc.

[0030] When a second oxygen supply mechanism is configured at the same time, the above-mentioned second oxygen delivery pipeline can also be connected to the oxygen buffer device 6, or a storage bypass is connected in parallel on the second oxygen delivery pipeline, and this storage bypass is connected to the oxygen buffer device 6. In this way, the production of the oxygen production unit can be coordinated, and the start-stop times of the oxygen production unit can be reduced; in addition, the oxygen delivered by the two groups of oxygen supply mechanisms is mixed in the oxygen buffer device 6. The oxygen prepared by the oxygen production unit can compensate to a certain extent for the problem that the temperature of the oxygen prepared by liquid oxygen is too low, and the oxygen prepared by liquid oxygen can correspondingly compensate for the problem that the concentration of the oxygen prepared by the oxygen production unit is too low. Therefore, the oxygen blowing effect of the electric furnace can be improved.

[0031] Furthermore, as Figure 1 , the first valve control unit includes a pressure regulating valve group 73. The oxygen buffer device 6 is located upstream of the pressure regulating valve group 73. The oxygen output from the oxygen buffer device 6 is regulated by the pressure regulating valve group 73 and then sent to the electric furnace to meet the oxygen blowing requirements of the electric furnace and avoid adverse effects on the production of the electric furnace.

[0032] In one embodiment, as Figure 1 , the first valve control unit includes a stop valve 71, a check valve 72 and a pressure regulating valve group 73. The stop valve 71, the check valve 72 and the pressure regulating valve group 73 are arranged in sequence along the oxygen delivery direction. When the oxygen buffer device 6 is provided, the oxygen buffer device 6 can be located between the check valve 72 and the pressure regulating valve group 73.

[0033] In one embodiment, the high-temperature medium inlet of the gasifier 5 is connected to the electric furnace flue gas delivery pipeline of the electric furnace, and the waste heat of the electric furnace flue gas is used for the gasification of liquid oxygen, avoiding the waste of the waste heat of the electric furnace flue gas, reducing the consumption of heat sources such as steam required for the gasification of liquid oxygen at the same time, and effectively reducing the energy consumption and cost of the electric furnace smelting production.

[0034] In one embodiment, the electric furnace flue gas is led out through an adiabatic flue. The above-mentioned electric furnace flue gas delivery pipe is connected to this adiabatic flue. Among them, the electric furnace flue gas delivery pipe is successively connected in series with a combustion settling chamber, a waste heat boiler and a dust removal device and then connected to the above-mentioned gasifier 5. The flue gas temperature at the outlet of the waste heat boiler is controlled at 180 - 280 °C; through the waste heat boiler and the above-mentioned gasifier 5, the waste heat of the electric furnace flue gas can be fully recovered and utilized.

[0035] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electric furnace smelting system capable of utilizing valley electricity for production, comprising an electric furnace, wherein the electric furnace is provided with an oxygen blowing unit, and characterized in that: It also includes a first oxygen supply mechanism, which includes a liquid oxygen storage device and a vaporizer. The liquid oxygen storage device is connected to the liquid oxygen inlet of the vaporizer through a liquid oxygen delivery pipeline, and the oxygen outlet of the vaporizer is connected to the oxygen inlet of the oxygen blowing unit through a first oxygen delivery pipeline. A first valve control unit is provided on the first oxygen delivery pipeline.

2. The electric furnace smelting system according to claim 1, characterized in that: It also includes a second oxygen supply mechanism, which includes an oxygen generator, the oxygen outlet of the oxygen generator is connected to the oxygen inlet of the oxygen blowing unit through a second oxygen delivery pipeline, and a second valve control unit is provided on the second oxygen delivery pipeline.

3. The electric furnace smelting system according to claim 1, characterized in that: The first oxygen delivery pipeline is also connected in series with an oxygen buffer device.

4. The electric furnace smelting system according to claim 3, characterized in that: The oxygen buffer device comprises an oxygen storage tank.

5. The electric furnace smelting system according to claim 3, characterized in that: The first valve control unit includes a pressure regulating valve group, and the oxygen buffer device is located upstream of the pressure regulating valve group.

6. The electric furnace smelting system according to claim 1, characterized in that: The high temperature medium inlet of the gasifier is connected to the electric furnace fume conveying pipeline of the electric furnace.

7. The electric furnace smelting system according to claim 6, characterized in that: The electric furnace flue gas conveying pipeline is connected in series with the combustion settling chamber, the waste heat boiler and the dust removal device in sequence and then connected to the gasifier.

8. The electric furnace smelting system according to claim 1, characterized in that: The first valve control unit comprises a stop valve, a check valve and a pressure regulating valve group, and the stop valve, the check valve and the pressure regulating valve group are arranged in sequence along the oxygen delivery direction.

9. The electric furnace smelting system according to claim 1, characterized in that: The liquid oxygen delivery pipeline is provided with a liquid delivery pump.

10. The electric furnace smelting system according to claim 1, characterized in that: The liquid oxygen storage device comprises a liquid oxygen storage tank.

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