Steel plant electric furnace dioxin control device

Abstract

The utility model discloses a steel plant electric furnace dioxin control device which comprises a power mechanism, the power mechanism is used for conveying air to a steelmaking system in an airflow mode, the power mechanism is connected with a feeding mechanism, the feeding mechanism is used for conveying chemicals to the steelmaking system, and the power mechanism is matched with the feeding mechanism. The medicament is scattered and mixed into the air to form mixed airflow which is introduced into a pipeline among the tunnel kiln, the settling chamber and the bag-type dust collector. Two steel plant electric furnace dioxin control devices are externally connected to a steelmaking system, one steel plant electric furnace dioxin control device is connected to a tunnel kiln through a hose, the other steel plant electric furnace dioxin control device is connected to a pipeline arranged between a settling chamber and a bag-type dust collector through a hose, and the steel plant electric furnace dioxin control device conveys filtered air in an airflow mode through a power mechanism. The chemicals fed by the feeding mechanism are mixed in the airflow to form mixed airflow, and the mixed airflow is mixed with the flue gas, so that the dioxin in the flue gas is effectively inhibited and adsorbed.

Description

Technical Field

[0001] This utility model relates to the field of dioxin treatment technology, and in particular to a dioxin control device for electric furnaces in steel plants. Background Technology

[0002] Dioxins are a significant pollutant generated in the steel industry. They are highly toxic and pose a serious threat to human health; the International Agency for Research on Cancer (IARC) has classified them as a Group 1 carcinogen. In recent years, with the increasing emphasis on environmental protection in China, dioxin testing has become a mandatory requirement, and emissions have been restricted. Dioxin pollution in the steelmaking industry is mainly concentrated in the preheating and cooling processes of scrap steel during iron ore sintering and electric arc furnace (EAF) steelmaking. The flue gas produced during EAF steelmaking contains a certain amount of dioxins, and EAF steelmaking has become the fourth largest industrial source of dioxin pollution.

[0003] Dioxins produced by electric arc furnace steelmaking systems are usually concentrated in the settling chamber. However, a large amount of dioxins are emitted into the atmosphere through the bag filter connected to the settling chamber and eventually reach the chimney. This poses a certain emission risk. Utility Model Content

[0004] This invention provides a dioxin control device for electric furnaces in steel plants, which can solve the problem of insufficient suppression of dioxins in flue gas mentioned in the background art.

[0005] A dioxin control device for an electric arc furnace in a steel plant, applicable to a steelmaking system, the steelmaking system including a tunnel kiln, the tunnel kiln being connected to a settling chamber along the flue gas conveying direction, the settling chamber being connected to a bag filter through a pipeline, including: a power mechanism for conveying air to the steelmaking system in the form of an airflow;

[0006] The power mechanism is connected to the feeding mechanism, which is used to deliver the reagent to the steelmaking system. The power mechanism and the feeding mechanism work together to disperse and mix the reagent into the air to form a mixed airflow, which is then introduced into the pipeline between the tunnel kiln, the settling chamber and the bag filter.

[0007] Preferably, the power mechanism includes a Roots blower, the air inlet of which is connected to an airflow channel, and a filter is provided in the airflow channel.

[0008] Preferably, the outlet of the Roots blower is connected to a silencer.

[0009] Preferably, the silencer is connected to a Venturi jet tube along the airflow direction.

[0010] Preferably, the feeding mechanism includes a hopper, a mixing frame is provided inside the hopper, and a discharge port is provided at the bottom of the hopper.

[0011] Preferably, the hopper is connected to a screw conveyor, which includes a body, and the top inlet of the body is connected to the outlet.

[0012] Preferably, the machine body is provided with a rotating shaft, the surface of which is fixedly mounted with helical blades, and one end of the rotating shaft is connected to a drive motor.

[0013] Preferably, a discharge pipe is connected to the discharge end on one side of the machine body.

[0014] Preferably, the discharge pipe is placed vertically.

[0015] Preferably, the bottom discharge end of the discharge pipe is connected to the Venturi jet pipe.

[0016] The beneficial effects of this utility model are:

[0017] Two dioxin control devices for the electric arc furnace of the steel plant are externally connected to the steelmaking system. One device is connected to the tunnel kiln via a hose, and the other is connected to the pipeline between the settling chamber and the bag filter via a hose. The dioxin control device of the steel plant's electric arc furnace delivers filtered air in the form of an airflow through a power mechanism. During delivery, the reagents added by the feeding mechanism are mixed with the airflow to form a mixed airflow, which is continuously sprayed into the pipeline between the tunnel kiln, the settling chamber and the bag filter. The mixed airflow formed by the reagents and the airflow can be more fully mixed with the flue gas, thereby effectively inhibiting and adsorbing dioxins in the flue gas, reducing the concentration of dioxins in the discharged flue gas and reducing emission risks. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a dioxin control device for an electric furnace in a steel plant provided by this utility model;

[0019] Figure 2 for Figure 1 Enlarged view in the middle;

[0020] Figure 3 This utility model provides a structural schematic diagram of a dioxin control device for an electric furnace in a steel plant, assembled in a steelmaking system.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Power mechanism; 11. Roots blower; 12. Silencer; 13. Venturi jet tube; 2. Airflow channel; 3. Feeding mechanism; 31. Hopper; 311. Discharge port; 32. Screw conveyor; 321. Drive motor; 322. Machine body; 33. Discharge pipe; 4. Electric furnace; 5. Tunnel kiln; 6. Settling chamber; 7. Bag filter; 8. Chimney. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0024] like Figure 3 As shown, this utility model proposes a dioxin control device for electric furnaces in steel plants, applicable to steelmaking systems. The steelmaking system includes an electric furnace 4, which is connected to a tunnel kiln 5 via a flue gas pipe. The tunnel kiln 5 is connected to a settling chamber 6 along the flue gas conveying direction via a flue gas pipe. The settling chamber 6 is connected to a bag filter 7 via a pipeline. The bag filter 7 is connected to a chimney 8 via a flue gas pipe.

[0025] like Figures 1-2 As shown, the dioxin control device for the electric arc furnace of the steel plant includes: a power unit 1, which is used to deliver air to the steelmaking system in the form of an airflow.

[0026] Specifically, the power unit 1 includes a Roots blower 11. The air inlet of the Roots blower 11 is connected to an airflow channel 2. A filter is installed in the airflow channel 2 to filter the ambient air, making the airflow output by the Roots blower 11 cleaner and preventing solid impurities in the air from contaminating the subsequently added reagents (powdered dioxin inhibitors or dioxin adsorbents). The air outlet of the Roots blower 11 is connected to a silencer 12, and the silencer 12 is connected to a Venturi jet tube 13 along the airflow direction.

[0027] The silencer 12 employs a pipe noise suppressor to reduce noise generated by airflow. The Venturi jet pipe 13 is a type of pipe that utilizes the Venturi effect to achieve fluid mixing, transport, or pressurization. The Venturi effect refers to the change in velocity and pressure caused by the change in the cross-sectional area of ​​a pipe or nozzle as the fluid passes through it. According to Bernoulli's equation, the fluid velocity increases and the pressure decreases as it passes through the constricted portion of the pipe. This low-pressure region can guide other fluids to enter, forming a jet.

[0028] A Venturi jet tube 13 typically consists of three main parts: an inlet section, a constriction section, and an expansion section. Airflow enters the jet tube through the inlet section at a relatively low velocity and high pressure. As the airflow flows into the constriction section, its velocity increases and its pressure decreases. Upon entering the expansion section, the airflow velocity decreases and its pressure increases; at this point, energy conversion occurs, either by drawing in other fluids or increasing the fluid flow rate.

[0029] The power unit 1 is connected to the feeding unit 3, which is used to deliver reagents to the steelmaking system.

[0030] Specifically, the feeding mechanism 3 includes a hopper 31, within which a stirring frame is installed. The stirring frame is driven by a motor, and its rotation mixes the pharmaceuticals within the hopper 31, improving the uniformity of the feed. A discharge port 311 is located at the bottom of the hopper 31, from which the mixed pharmaceuticals are discharged. The hopper 31 is connected to a screw conveyor 32, which includes a body 322. The top inlet of the body 322 is connected to the discharge port 311 of the hopper 31. A rotating shaft is installed inside the body 322, with helical blades fixedly mounted on its surface. One end of the shaft is connected to a drive motor 321, which drives the shaft and helical blades to rotate. The helical blades then transport the pharmaceuticals from the body 322 outwards. The screw conveyor 32 is a mature piece of equipment in the prior art and is widely used in this field; therefore, it will not be described in detail here.

[0031] Furthermore, a discharge pipe 33 is connected to the discharge end on one side of the machine body 322. The discharge pipe 33 is placed vertically, and the bottom discharge end of the discharge pipe 33 is connected to the Venturi jet pipe 13. The vertically placed discharge pipe 33 allows the agent discharged from the screw conveyor 32 to be smoothly discharged into the Venturi jet pipe 13 by gravity.

[0032] In this embodiment, the power mechanism 1 and the feeding mechanism 3 cooperate to disperse and mix the reagent into the air to form a mixed airflow, which is then introduced into the pipeline between the tunnel kiln 5, the settling chamber 6, and the bag filter 7. In use, two electric arc furnace dioxin control devices from the steel plant are externally connected to the steelmaking system. One device is connected to the tunnel kiln 5 via a flexible hose, and the other is connected to the pipeline between the settling chamber 6 and the bag filter 7 via a flexible hose. Flue gas flows from the electric arc furnace 4 to the tunnel kiln 5, and then from the tunnel kiln 5 into the settling chamber 6. After settling, the flue gas flows into the bag filter 7 for dust removal, and the purified flue gas is discharged to the outside through the chimney 8. During this process, the dioxin control device of the steel plant's electric arc furnace delivers filtered air in the form of an airflow through a Roots blower 11. During delivery, dioxin inhibitors in the hopper 31 enter the Venturi jet pipe 13 via a screw conveyor 32 and a discharge pipe 33. The dioxin inhibitors mix with the airflow to form a mixed airflow, which is continuously injected into the tunnel kiln 5. The mixed airflow flows with the flue gas, inhibiting dioxins both in the high-temperature section and during the cooling process of the tunnel kiln 5. Simultaneously, another dioxin control device of the steel plant's electric arc furnace continuously injects the mixed airflow containing dioxin adsorbent into the pipeline between the tunnel kiln 5, the settling chamber 6, and the bag filter 7 to adsorb residual dioxins in the flue gas. The flue dust after dioxin adsorption is intercepted by the filter bags in the bag filter 7 and falls into the integrated ash. The mixed airflow formed by the agent and the airflow can be more fully mixed with the flue gas, thereby effectively inhibiting and adsorbing dioxins in the flue gas, reducing the concentration of dioxins in the flue gas discharged from chimney 8, improving the cleanliness of the discharged gas, making it more environmentally friendly, and reducing emission risks.

[0033] In some embodiments, the screw conveyor 32 may be equipped with a remote controller to adjust the discharge dosage of the agent (dioxin inhibitor or dioxin adsorbent) according to the flue gas parameters in the steelmaking system (including but not limited to flue gas flow rate, particulate matter, nitrogen oxides, sulfur dioxide, hydrogen chloride, and carbon monoxide).

[0034] Working principle: Two dioxin control devices for electric arc furnaces in the steel plant are connected to the steelmaking system. One device is connected to the tunnel kiln 5 via a hose, and the other is connected to the pipeline between the settling chamber 6 and the bag filter 7 via a hose. The dioxin control device for electric arc furnaces in the steel plant delivers filtered air in the form of an airflow through the power mechanism 1. During delivery, dioxin inhibitors added by the feeding mechanism 3 are mixed in the airflow to form a mixed airflow, which is continuously sprayed into the tunnel kiln 5. The mixed airflow flows with the flue gas and has an inhibitory effect on dioxins in both the high-temperature section and the cooling process of the tunnel kiln 5. At the same time, the other dioxin control device for electric arc furnaces in the steel plant continuously sprays the mixed airflow containing dioxin adsorbent into the pipeline between the tunnel kiln 5, the settling chamber 6 and the bag filter 7 to adsorb residual dioxins in the flue gas.

[0035] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A dioxin control device for an electric arc furnace in a steel plant, applicable to a steelmaking system, the steelmaking system comprising a tunnel kiln (5), the tunnel kiln (5) being connected to a settling chamber (6) along the flue gas conveying direction, the settling chamber (6) being connected to a bag filter (7) via a pipeline, characterized in that, include: A power mechanism (1) is used to deliver air to the steelmaking system in the form of an airflow; The power mechanism (1) is connected to the feeding mechanism (3), which is used to deliver the agent to the steelmaking system. The power mechanism (1) and the feeding mechanism (3) cooperate to disperse and mix the agent into the air to form a mixed airflow, which is used to enter the pipeline between the tunnel kiln (5), the settling chamber (6) and the bag filter (7).

2. The dioxin control device for an electric furnace in a steel plant as described in claim 1, characterized in that, The power mechanism (1) includes a Roots blower (11), the air inlet of which is connected to an airflow channel (2), and a filter is provided in the airflow channel (2).

3. The dioxin control device for an electric furnace in a steel plant as described in claim 2, characterized in that, The outlet of the Roots blower (11) is connected to a silencer (12).

4. The dioxin control device for electric furnaces in steel plants as described in claim 3, characterized in that, The silencer (12) is connected to a Venturi jet tube (13) along the airflow direction.

5. A dioxin control device for an electric furnace in a steel plant as described in claim 4, characterized in that, The feeding mechanism (3) includes a hopper (31), a stirring frame is provided inside the hopper (31), and a discharge port (311) is provided at the bottom of the hopper (31).

6. The dioxin control device for an electric furnace in a steel plant as described in claim 5, characterized in that, The hopper (31) is connected to the screw conveyor (32), which includes a body (322) and the top feed end of the body (322) is connected to the discharge port (311).

7. A dioxin control device for an electric furnace in a steel plant as described in claim 6, characterized in that, The machine body (322) is provided with a rotating shaft, and a spiral blade is fixedly installed on the surface of the rotating shaft. One end of the rotating shaft is connected to a drive motor (321).

8. A dioxin control device for an electric furnace in a steel plant as described in claim 7, characterized in that, A discharge pipe (33) is connected to the discharge end on one side of the machine body (322).

9. A dioxin control device for an electric furnace in a steel plant as described in claim 8, characterized in that, The discharge pipe (33) is placed vertically.

10. A dioxin control device for an electric furnace in a steel plant as described in claim 9, characterized in that, The bottom discharge end of the discharge pipe (33) is connected to the Venturi jet pipe (13).

Images