A control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace

Abstract

This invention relates to a control method for the primary dust collector and dynamic sealing fan of a continuously feeding electric arc furnace, belonging to the field of metallurgical technology. The method includes the following steps: acquiring the power supply and oxygen supply intensity information of the electric arc furnace; setting the initial speed of the primary dust collector and dynamic sealing fan based on the acquired information; acquiring the pressure and temperature information of the preheating duct outlet A, the pressure and temperature information of the dynamic seal B, and the flue gas information; and the control system dynamically adjusting the speed of the primary dust collector and dynamic sealing fan in real time based on this information to achieve adaptive matching of exhaust volume to meet operating conditions during the smelting process. This invention enables the primary dust collector and dynamic sealing fan to adapt to the smelting state of the electric arc furnace, solving the problems of low outlet flue gas temperature, poor sealing effect, and flue gas discharge from the dynamic sealing fan caused by relying on manual experience in traditional horizontal continuous feeding systems.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology and relates to a control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace. Background Technology

[0002] Continuous feeding electric arc furnaces offer advantages such as continuous scrap metal addition without opening the furnace lid, short smelting cycles, low energy consumption, and low flue gas emissions. They are crucial metallurgical equipment for achieving energy structure transformation, implementing energy conservation and emission reduction, and building a resource-saving and environmentally friendly society. Traditional horizontal continuous feeding systems rely on manual experience for operation, leading to problems such as low outlet flue gas temperature, poor sealing, or dust discharge from dynamic sealing fans. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a control method for the primary dust removal and dynamic sealing fan of a continuous feeding electric arc furnace, so as to realize the adaptation of the primary dust removal fan and the dynamic sealing fan to the melting state of the electric arc furnace, and solve the problems of low outlet flue gas temperature, poor sealing effect and flue gas discharge from the dynamic sealing fan caused by the reliance on manual experience to operate the traditional horizontal continuous feeding system.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A control method for the primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace includes the following steps:

[0006] S1. Obtain information on the power supply and oxygen supply intensity of the electric arc furnace;

[0007] S2. Set the initial speed of the primary dust removal fan and the dynamic sealing fan according to the power supply and oxygen supply intensity information of the electric arc furnace, so as to meet the sealing requirements of the dynamic seal and the exhaust requirements of the flue.

[0008] S3. Obtain pressure and temperature information of preheating duct outlet A, pressure and temperature information of dynamic seal B, and dust information;

[0009] S4. The control system dynamically adjusts the speed of the primary dust removal fan and the dynamic sealing fan in real time based on the pressure and temperature information of the preheating duct outlet A, the pressure and temperature information of the dynamic seal B, and the dust information, so as to achieve adaptive matching of the exhaust volume to achieve the working condition purpose during the smelting process.

[0010] Optionally, during the operation of the electric arc furnace, the current and voltage information of the electric arc furnace are acquired through a current acquisition device and a voltage acquisition device, respectively, and the power supply of the electric arc furnace is obtained according to the formula power = current x voltage.

[0011] Optionally, the pressure and temperature information of the preheating duct outlet A can be obtained by using a pressure detection device and a temperature detection device respectively installed at the preheating duct outlet A.

[0012] Optionally, the pressure and temperature information of the dynamic seal B can be obtained through a pressure detection device and a temperature detection device respectively installed at the dynamic seal B.

[0013] Optionally, dust information at the dynamic seal B can be obtained through a vision system set at the corresponding dynamic seal port location.

[0014] The beneficial effects of this invention are as follows:

[0015] (1) It can monitor the pressure and temperature information of the preheating duct outlet A and the pressure and temperature information of the dynamic seal B in real time. It can also judge whether the smoke and dust are overflowing through machine vision. This greatly enriches the smelting information mastered by the operators, and can adjust the smelting strategy in real time to maximize the performance advantages of the continuous feeding electric arc furnace.

[0016] (2) The speed of the primary dust removal fan and the dynamic sealing fan is controlled in a coordinated manner, and the fan speed is adjusted in real time. This achieves adaptive matching of exhaust volume to meet the working conditions during the smelting process, and solves the problems of low outlet flue gas temperature, poor sealing effect, and dust discharge from the dynamic sealing fan caused by the reliance on manual experience to judge the operation of the traditional horizontal continuous feeding system.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a flowchart of the control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace according to the present invention;

[0020] Figure 2 This is a schematic diagram of the equipment control points in the continuous feeding electric arc furnace of the present invention. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Please see Figures 1-2 A control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace includes the following steps:

[0025] S1. Obtain information on the power supply and oxygen supply intensity of the electric arc furnace;

[0026] S2. Set the initial speed of the primary dust removal fan and the dynamic sealing fan according to the power supply and oxygen supply intensity information of the electric arc furnace, so as to meet the sealing requirements of the dynamic seal and the exhaust requirements of the flue.

[0027] S3. Obtain pressure and temperature information of preheating duct outlet A, pressure and temperature information of dynamic seal B, and dust information;

[0028] S4. The control system dynamically adjusts the speed of the primary dust removal fan and the dynamic sealing fan in real time based on the pressure and temperature information of the preheating duct outlet A, the pressure and temperature information of the dynamic seal B, and the dust information, so as to achieve adaptive matching of the exhaust volume to achieve the working condition purpose during the smelting process.

[0029] In step S4, the control system first determines whether the pressure and temperature information at the preheating duct outlet A and the dynamic seal B meet the preset pressure and temperature conditions of the control system. That is, it determines whether the pressure and temperature are suitable. If not, the speed coordination controller, based on the acquired pressure and temperature information, adjusts the speed of the primary dust removal fan and the dynamic seal fan through the frequency converter. The frequency converter output frequency changes adaptively to achieve adaptive matching of the exhaust volume during the smelting process to meet the operating conditions, so that the pressure and temperature meet the preset pressure and temperature conditions of the control system. If yes, it determines whether there is flue gas overflow based on the dust information. If there is no flue gas overflow, it maintains the current state. If there is flue gas overflow, the speed coordination controller, based on the acquired flue gas overflow information, adjusts the speed of the primary dust removal fan and the dynamic seal fan through the frequency converter. The frequency converter output frequency changes adaptively to achieve adaptive matching of the exhaust volume during the smelting process to meet the operating conditions, so that the pressure of the dynamic seal B is greater than the flue outlet pressure, and the pressure and temperature meet the preset pressure and temperature conditions of the control system.

[0030] A top fume hood and a bottom conveying trough form a preheating duct. The flue gas generated by the electric arc furnace passes through this duct and, at outlet A, enters the primary dust collector fan via a pipeline for dust removal. A dynamic seal B is located at the scrap steel inlet at the end of the preheating duct, and is sealed by a dynamic sealing fan to prevent cold air from entering the preheating duct. This invention achieves adaptive matching of exhaust volume to meet operating conditions during smelting by coordinating the speeds of the primary dust collector fan and the dynamic sealing fan, and adjusting the fan speed in real time. This solves the problems of low outlet flue gas temperature, poor sealing effect, or dust discharge from the dynamic sealing fan caused by relying on manual experience in traditional horizontal continuous feeding systems.

[0031] Optionally, during the operation of the electric arc furnace, the current and voltage information of the electric arc furnace are acquired through a current acquisition device and a voltage acquisition device, respectively, and the power supply of the electric arc furnace is obtained according to the formula power = current x voltage; the pressure and temperature information of the preheating duct outlet A are acquired through a pressure transmitter and a thermocouple installed at the preheating duct outlet A; the pressure and temperature information of the dynamic seal B are acquired through a pressure transmitter and a thermocouple installed at the dynamic seal B; and the smoke and dust information of the dynamic seal B is acquired through a vision system installed at the corresponding position of the dynamic seal.

[0032] This invention enables the primary dust removal fan and dynamic sealing fan to adapt to the smelting state of the electric arc furnace, solving the problems of low outlet flue gas temperature, poor sealing effect, and dust discharge from the dynamic sealing fan caused by the reliance on manual experience in traditional horizontal continuous feeding systems.

[0033] Example

[0034] A control method for the primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace includes the following steps:

[0035] 1) Obtaining power supply and oxygen supply intensity information of electric arc furnace: During the operation of electric arc furnace, the current and voltage information of electric arc furnace are obtained through current acquisition device and voltage acquisition device, thereby obtaining the power supply and oxygen supply intensity information of electric arc furnace.

[0036] 2) Set the initial speed of the primary dust removal fan and the initial speed of the dynamic sealing fan, i.e., the operating frequency, based on the power supply and oxygen supply intensity information of the electric arc furnace;

[0037] 3) Obtain pressure and temperature information at preheating duct outlet A: Obtain pressure and temperature information at preheating duct outlet A by using a pressure transmitter and a thermocouple, respectively;

[0038] 4) Obtain dynamic seal B pressure and outlet temperature information: Obtain dynamic seal B pressure and temperature information by using a pressure transmitter and a thermocouple respectively;

[0039] 5) Obtain dust information of dynamic seal B: Obtain dust information of dynamic seal B through machine vision;

[0040] 6) The speed coordination controller combines the acquired pressure and temperature information with the flue gas overflow status information, and uses a frequency converter to adjust the speed of the primary dust removal fan and the dynamic sealing fan. The frequency converter output frequency changes adaptively to achieve adaptive matching of exhaust volume during the smelting process to meet the working conditions.

[0041] In this embodiment, the speed coordination controller uses the pressure and temperature information of the preheating duct outlet A, the pressure and temperature information of the dynamic seal B, and the dust information to intelligently and dynamically adjust the speed of the primary dust removal fan and the dynamic sealing fan. This allows them to adaptively and optimally match the smelting state inside the electric arc furnace, achieving adaptive matching of exhaust volume to meet operating conditions during the smelting process. This solves the problems of low outlet flue gas temperature, poor sealing effect, and dust discharge from the dynamic sealing fan caused by relying on manual experience in traditional horizontal continuous feeding systems.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace, characterized in that: Includes the following steps: S1. Obtain information on the power supply and oxygen supply intensity of the electric arc furnace; S2. Set the initial speed of the primary dust removal fan and the dynamic sealing fan according to the power supply and oxygen supply intensity information of the electric arc furnace, so as to meet the sealing requirements of the dynamic seal and the exhaust requirements of the flue. S3. Obtain pressure and temperature information of preheating duct outlet A, pressure and temperature information of dynamic seal B, and dust information; S4. The control system dynamically adjusts the speed of the primary dust removal fan and the dynamic sealing fan in real time based on the pressure and temperature information of the preheating duct outlet A, the pressure and temperature information of the dynamic seal B, and the dust information, so as to achieve adaptive matching of the exhaust volume to achieve the working condition purpose during the smelting process.

2. The control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace according to claim 1, characterized in that: During the operation of the electric arc furnace, the current and voltage information of the electric arc furnace are acquired through the current acquisition device and the voltage acquisition device, respectively. According to the formula power = current x voltage, the power supply of the electric arc furnace is obtained.

3. The control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace according to claim 1, characterized in that: Pressure and temperature information at the outlet A of the preheating duct are obtained by pressure detection device and temperature detection device respectively installed at the outlet A of the preheating duct.

4. The control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace according to claim 1, characterized in that: Pressure and temperature information of dynamic seal B are obtained by pressure detection device and temperature detection device installed at dynamic seal B, respectively.

5. The control method for primary dust removal and dynamic sealing fan of a continuously feeding electric arc furnace according to claim 1, characterized in that: Information on smoke and dust at point B of the dynamic seal is obtained through a vision system positioned at the corresponding dynamic seal opening location.

Images