Automatic control method and system for iron tapping dust removal fan based on change of molten iron ladle weight

Abstract

The present invention discloses an automatic control method and system for a dust removal fan for iron tapping based on the weight change of a molten iron ladle, which relates to the field of ore-blasting furnaces, and includes a molten iron ladle, a weighing sensor, a fan parameter intelligent control module, a fan control cabinet and a fan; the steps include: judging whether there is a molten iron ladle under the current iron tapping hole according to the signal value of the weighing sensor; the fan enters a pre-working mode and starts low-power parameter operation, and whether the electric signal value G after continuous conversion by the fan parameter intelligent control module increases over time; the fan enters a working mode, and the fan parameter intelligent control module continuously judges the weighing signal value; the molten iron ladle begins to move away after being filled with molten iron, and the fan parameter intelligent control module judges the size of the electric signal value G. The present invention can monitor the iron tapping amount in real time by setting a weighing sensor, and at the same time, accurately judge the iron tapping state of the iron tapping hole in real time according to the weight of the molten iron ladle through the fan parameter intelligent control module and corresponding judgment conditions.

Description

Technical Field

[0001] The invention relates to the technical field of ore-fired furnace smelting, and in particular to an intelligent control method and system for an ore-fired furnace iron-tapping smoke exhaust fan. Background Art

[0002] Ferroalloys represented by ferrosilicon, ferromanganese and ferrochrome are all smelted and produced in an ore-fired furnace. The smelted molten iron needs to be discharged into the ladle through the tapping port of the ore-fired furnace. The main process flow of tapping is as follows: the dried empty ladle is moved to the bottom of the tapping port via the rails, and the tapping chute is checked for correct status before the eye opening operation is performed. Before opening, the sticky slag around the furnace eye is cleaned, the burn-through device is pushed to a reasonable position for power supply, the top of the steel chisel is continuously contacted with the furnace eye and rotated in circles to gradually burn the arc into the furnace eye until the molten iron flows out evenly, and after the furnace eye is opened, the burn-through device is closed and withdrawn, and the molten iron in the furnace flows into the ladle through the furnace eye and the tapping chute in turn. After tapping, the eye is blocked, and the ladle filled with molten iron is pulled away on the rails for pouring of the next process.

[0003] A large amount of smoke is generated during the tapping process of an ore-fired furnace. A dust removal fan is required to suck the tapping smoke into the smoke hood above the tapping port and enter the dust removal system through the flue for purification before discharge. In order to achieve a better exhaust effect, the dust removal fan is usually always in operation and consumes power. However, the tapping process of an ore-fired furnace is not characterized by continuous tapping, but intermittent tapping, that is, tapping once every certain period of time. No smoke is generated during the non-tapping period, and the dust removal fan is always in operation, wasting extra electricity.

[0004] Chinese patent CN110146170A The present invention relates to the field of blast furnace ironmaking technology, and in particular to a ladle monitoring device, system and system for dispatching a ladle, in which the ladle is running on a track, and the ladle surface has more than one position area, including: an infrared thermal imaging sensor for collecting the temperature value of each position area respectively; a control cabinet for receiving the temperature value collected by the infrared thermal imaging sensor and transmitting it to a temperature display module after signal processing; a temperature display module, which is used to judge whether the temperature value of each position area exceeds a preset temperature value, and display the target temperature value exceeding the preset temperature value and the position area where the target temperature value is located, so as to predict the health status of the ladle in advance. However, the patent collects the temperature value through the infrared thermal imaging sensor, processes the temperature value through the control cabinet, and judges whether the temperature value meets the conditions through the temperature display module, and the fan will always be in working state, wasting extra electric energy.

[0005] Chinese Patent CN210135987U This utility model discloses an online real-time weighing device for a molten iron car, which relates to the field of steel manufacturing devices. In view of the existing inaccurate weighing problem, the following scheme is proposed, which includes a vehicle-mounted weighing module, the vehicle-mounted weighing module includes a high-temperature heavy-load sensor, the upper part of the high-temperature heavy-load sensor is provided with a bolster, the lower part of the high-temperature heavy-load sensor is provided with a spring group, and the lower part of the spring group is provided with a wheel group. The utility model has a simple structure and is easy to use. It can effectively improve the accuracy of the amount of iron discharged from each bag of molten iron, reduce the number of iron exchanges between iron exchanges, reduce the pressure of iron exchange dust removal, and improve the accuracy of the amount of scrap steel loaded in each bag of molten iron, and ensure the stability of the temperature of each bag of molten iron exchange. However, this patent can measure the amount of iron discharged from the molten iron through the high-temperature heavy-load sensor in the vehicle-mounted weighing module, and does not disclose the technical solution for judging the amount of iron discharged, and there is still a problem of wasting electric energy.

[0006] Chinese patent CN205540205U discloses a dust removal fan energy-saving system, characterized in that: the dust removal fan energy-saving system includes a smoke sensor arranged on the main exhaust pipe and an infrared temperature sensor, a wind speed and direction sensor and a humidity sensor arranged at the iron outlet and the water filling port; wherein: the smoke sensor, the infrared temperature sensor, the wind speed and direction sensor and the humidity sensor are connected to the PLC controller through a signal conditioner and a data acquisition device, the first output end of the PLC controller is connected to the frequency converter, the second output end of the PLC controller is connected to the damper solenoid valve through a relay, and the third output end of the PLC controller is bidirectionally connected to the industrial computer. However, this patent achieves the dust removal and energy-saving effects of the fan by means of a smoke sensor arranged on the main exhaust pipe and an infrared temperature sensor, a wind speed and direction sensor and a humidity sensor arranged at the iron outlet and the water filling port, and does not disclose a technical solution for judging the iron output, and there is still a problem of wasting electric energy. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a method and system for controlling iron tapping based on the weight change of a molten iron ladle.

[0008] In order to achieve the purpose of the present invention, the present invention adopts the following technical solution:

[0009] A method for controlling iron tapping based on the weight change of a molten iron ladle comprises the following steps:

[0010] Step S1: Turn on the machine, and judge whether there is a molten iron ladle under the current tap hole according to the signal value of the weighing sensor. If the returned signal value is G0, it is judged that there is no molten iron ladle and enters the standby mode. At this time, the fan is in the off state; if the returned signal value is G1, it is judged that there is a molten iron ladle and enters step 2, entering the pre-working mode, and the fan is running at low power at this time;

[0011] Step S2: When the molten iron ladle enters the working position, that is, when the molten iron ladle moves to the bottom of the tapping port of the ore-fired furnace, the fan enters the pre-working mode and starts low-power parameter operation, and the fan parameter intelligent control module continuously determines whether the converted electrical signal value G increases over time and satisfies G1<G<G2; if the converted electrical signal value G does not increase, it continues to be in the pre-working mode; if the converted electrical signal value G starts to increase over time and satisfies G1<G<G2, it enters step 3, and the fan enters the working mode;

[0012] Step S3: During the iron-out process, the fan enters the working mode, and the fan parameter intelligent control module continuously determines the converted electrical signal value G. If the converted electrical signal value G continues to increase over time, the fan working mode is maintained. If the converted electrical signal value G no longer changes over time, step 4 is entered;

[0013] Step S4: After the ladle is filled with molten iron, it starts to move away. The fan parameter intelligent control module determines the size of the converted electrical signal value G. If G1<G<G2, the fan continues to be in working mode; if G=G0, it is determined that the ladle has been moved away and enters standby mode, and the fan is in the off state.

[0014] Furthermore, G in step S1 represents the converted electrical signal value, G0 represents the signal value without molten iron ladle, G1 represents the signal value of the weight of the empty molten iron ladle, and G2 represents the signal value of the weight of the molten iron ladle when fully loaded with molten iron.

[0015] Furthermore, the low power is 20%-40% of the rated power of the wind turbine.

[0016] Furthermore, the rated power of the fan depends on the model of the selected fan.

[0017] Furthermore, when the converted electrical signal value G does not increase with time, it indicates that no more molten iron flows into the ladle, and it is judged that the molten iron is full at this time.

[0018] Furthermore, the weighing sensor is replaced by an infrared camera for testing the tapping hole temperature, and the infrared camera is used to convert the temperature signal into an electrical signal.

[0019] A tapping control system based on the weight change of a molten iron ladle is used for a tapping control method, comprising a molten iron ladle, a weighing sensor for converting the weight signal of the molten iron ladle into an electrical signal, a fan parameter intelligent control module for judging the weight of the molten iron ladle, a fan control cabinet for adjusting the fan power, a fan and a smoke hood; the molten iron ladle is located above the weighing sensor; and the weighing sensor, the fan parameter intelligent control module, the fan control cabinet and the fan are connected in sequence by communication, and the smoke hood is connected to the fan.

[0020] Furthermore, it also includes an ore-fired furnace, and the iron outlet of the ore-fired furnace is correspondingly arranged above the opening of the molten iron ladle.

[0021] Furthermore, it also includes a flue, and a flue is arranged between the smoke hood and the fan, and smoke enters the smoke hood through the flue.

[0022] Furthermore, a weighing sensor is fixed on the running track of the molten iron ladle below the tap hole, and can convert the weight of the molten iron ladle into an electrical signal.

[0023] Furthermore, the weighing sensor is connected to the fan parameter intelligent control module, and the electrical signal converted by the weighing sensor is transmitted to the fan parameter intelligent control module through a signal line.

[0024] Furthermore, the fan parameter intelligent control module judges according to the weight of the molten iron ladle and outputs the result parameter value of the fan operation, and adjusts the fan power and on / off state through the fan control cabinet to realize closed-loop control of the fan operation state.

[0025] Compared with the prior art, the beneficial effects of the present invention are specifically embodied in:

[0026] The present invention can monitor the iron output in real time by arranging a weighing sensor, and can also accurately judge the iron output state of the tapping hole according to the weight of the molten iron ladle in real time by arranging a fan parameter intelligent control module and corresponding judgment conditions, and digitize the weight value of the molten iron ladle with a high-precision sensor, and the control module can accurately compare and judge the digitized signal; the fan working state is controlled according to whether the ore-fired furnace is tapping iron or not, so that the fan is automatically in a standby state when the ore-fired furnace is not tapping iron, thereby saving the fan operation power consumption, meeting the policy requirements of energy conservation, consumption reduction and emission reduction, and greatly improving the automation and intelligence level of the operation of the ore-fired furnace iron tapping and dust removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of the method of the present invention;

[0028] Figure 2 is a system structure diagram of the present invention;

[0029] Figure numerals: 1. Submerged arc furnace; 2. Iron ladle; 3. Weighing sensor; 4. Fan parameter intelligent control module; 5. Fan control cabinet; 6. Fan; 7. Smoke hood; 8. Iron outlet; 9. Flue. DETAILED DESCRIPTION

[0030] In order to make the purpose and technical solution of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0031] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “horizontal”, “left”, “right”, “front”, “back”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] Example 1

[0033] like Figure 1 The method for controlling the tapping of a molten iron ladle 2 based on the weight change is shown, comprising the following steps:

[0034] Step S1: Turn on the machine, and judge whether there is a molten iron ladle 2 under the current iron outlet 8 according to the signal value of the weighing sensor 3. If the returned signal value is G0, it is judged that there is no molten iron ladle 2 and enters the standby mode, and the fan 6 is in the off state at this time; if the returned signal value is G1, it is judged that there is a molten iron ladle 2 and enters step 2, entering the pre-working mode, and the fan 6 is running at low power at this time; wherein G represents the converted electrical signal value, G0 represents the signal value without molten iron ladle 2, G1 represents the signal value of the weight of the molten iron ladle 2 with no molten iron, and G2 represents the signal value of the weight of the molten iron ladle 2 when fully loaded with molten iron;

[0035] Specifically, after the weighing sensor 3 measures, the measured weight signal is converted into an electrical signal value G, and the electrical signal value G is transmitted to the fan parameter intelligent control module 4, and the fan parameter intelligent control module 4 judges the electrical signal value G. If G=G0, it is judged that there is no iron ladle 2 and enters the standby mode, and the fan 6 is in the closed state at this time. If G=G0, it is judged that there is an iron ladle 2 state, and the operation of step 2 is entered. The working principle of the weighing sensor is as follows: in the use of the weighing sensor 3, three components play an important role: an elastomer, a resistance strain gauge and a detection circuit. When weighing begins, once the object is placed on the sensor, the elastomer will deform due to the pressure of the object, and the deformation of the elastomer will cause the resistance strain gauge on its surface to deform, and the deformation of the resistance strain gauge will cause its resistance value to change, and then the increase or decrease of the resistance value will be converted into an electrical signal through the detection circuit, so that the weight of the object can be displayed, and the whole weighing is completed.

[0036] Step S2: When the molten iron ladle 2 enters the working position, that is, when the molten iron ladle 2 moves to below the tapping port 8 of the ore-fired furnace 1, the fan 6 enters the pre-working mode and starts to operate with low power parameters. The fan parameter intelligent control module 4 continuously determines whether the converted electrical signal value G increases over time and satisfies G1<G<G2; if the converted electrical signal value G does not increase, it continues to be in the pre-working mode; if the converted electrical signal value G starts to increase over time and satisfies G1<G<G2, it enters step 3, and the fan 6 enters the working mode and operates at rated power to ensure the exhaust effect. The power size varies according to the actual model.

[0037] Specifically, the low power is 20%-40% of the rated power of the fan 6 , and the rated power needs to be determined according to the model of the fan 6 and the like.

[0038] Step S3: During the iron-out process, the fan 6 enters the working mode, and the fan parameter intelligent control module 4 continuously determines the weighing signal value. If the signal value continues to increase over time, the fan 6 is kept in the working mode. If the signal value no longer changes over time, step 4 is entered;

[0039] Step S4: After the ladle 2 is filled with molten iron, it starts to move away. The fan parameter intelligent control module 4 determines the signal value. If G1<G<G2, the fan 6 continues to be in the working mode; if G=G0, it is determined that the ladle 2 has been moved away and enters the standby mode. The fan 6 is in the off state to save energy.

[0040] Specifically, after the ladle 2 is filled with molten iron, no more molten iron flows into the ladle 2, that is, the electrical signal value G does not increase with time. At this time, it can be determined that the molten iron is full.

[0041] like Figure 2The iron tapping control system based on the weight change of the molten iron ladle 2 shown in the figure comprises the molten iron ladle 2, a weighing sensor 3 for converting the weight of the molten iron ladle 2 into an electrical signal, a fan parameter intelligent control module 4 for judging the weight of the molten iron ladle 2, a fan control cabinet 5 for adjusting the power of the fan 6, a fan 6, a smoke hood 7 and a flue 9; and also comprises an ore-heating furnace 1, the iron tapping port 8 of the ore-heating furnace 1 is correspondingly located above the opening of the molten iron ladle 2; the molten iron ladle 2 is arranged above the weighing sensor 3, and the weighing sensor 3, the fan parameter intelligent control module 4, the fan control cabinet 5 and the fan 6 are sequentially connected by communication, and the smoke hood 7 is connected to the fan 6. Among them, the weighing sensor 3 is fixed on the running track of the molten iron ladle 2 below the iron tapping port 8, and can convert the weight of the molten iron ladle 2 into an electrical signal. The weighing sensor 3 is connected to the fan parameter intelligent control module 4, and the electrical signal converted by the weighing sensor 3 is transmitted to the fan parameter intelligent control module 4 through a signal line. The fan parameter intelligent control module 4 judges according to the weight of the molten iron ladle 2 and outputs the result parameter value of the fan 6 operation, and adjusts the power size and the on / off state of the fan 6 through the fan control cabinet 5 to realize the closed-loop control of the fan 6 operation state.

[0042] Combined with Figure 2 The working principle of the control system is as follows: the smelted molten iron is discharged into the ladle 2 through the iron outlet 8 of the ore-fired furnace 1. A weighing sensor 3 is provided below the ladle 2. The weighing sensor 3 is fixed on the running track of the ladle 2. A ladle 2 running track is provided below each ladle 2. The weighing sensor 3 converts the measured molten iron weight signal in the ladle 2 into a corresponding electrical signal through induction. The corresponding electrical signal is transmitted to the fan parameter intelligent control module 4 connected to the weighing sensor 3 through communication. The communication method here includes wired and wireless connection methods. The fan parameter intelligent control module 4 makes a judgment based on the set judgment conditions according to the received electrical signal, and transmits the judgment result parameter value to the fan control cabinet 5. The fan control cabinet 5 makes corresponding adjustments based on the received parameter value, wherein the fan control cabinet 5 can adjust the power of the fan 6 and the on and off state of the fan 6, thereby realizing closed-loop control of the operating state of the fan 6. Specifically, as Figure 1 The position of the smoke hood 7 and the flue 9 shown is located above the ladle 2, and the main function is to collect the smoke overflowing from the ladle 2 and the iron outlet 8, and the smoke enters the dust removal system through the flue 9 for purification and then is discharged. The reason why the smoke can be collected by the smoke hood 7 is mainly that the dust removal fan operates to have a suction effect, so that the smoke hood 7 and the flue 9 are in a negative pressure state.

[0043] Example 2

[0044] The control method of this embodiment has the same principle as that of the embodiment 1, and the difference from the embodiment 1 is the structure of the system, where the weighing sensor 3 is replaced by an infrared camera for testing the temperature of the tapping hole 8, and the infrared camera is used to convert the temperature signal into an electrical signal. The working principle of the infrared camera is to collect infrared wavelength signals within the field of view, convert infrared rays into video signals through the signal processing system in the camera, and transmit them to the computer system through the transmission network, and measure the temperature value of the object being measured according to the color depth of the video signal.

[0045] The above is only an embodiment of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for controlling the tapping of molten iron based on the weight change of the ladle, It is characterized in that The following steps are involved: Step S1: Turn on the machine, and judge whether there is a molten iron ladle under the current tap hole according to the signal value of the weighing sensor. If the returned signal value is G0, it is judged that there is no molten iron ladle and enters the standby mode. At this time, the fan is in the off state; if the returned signal value is G1, it is judged that there is a molten iron ladle and enters step S2, entering the pre-working mode, and the fan is running at low power at this time; In step S1, G represents the converted electrical signal value, G0 represents the signal value without a ladle, G1 represents the signal value of the weight of an empty ladle, and G2 represents the signal value of the weight of a ladle fully loaded with molten iron; Step S2: When the molten iron ladle enters the working position, that is, when the molten iron ladle moves to the bottom of the tapping port of the ore-fired furnace, the fan enters the pre-working mode and starts low-power parameter operation, and the fan parameter intelligent control module continuously determines whether the converted electrical signal value G increases over time and satisfies G1<G<G2; if the converted electrical signal value G does not increase, it continues to be in the pre-working mode; if the converted electrical signal value G starts to increase over time and satisfies G1<G<G2, it enters step S3, and the fan enters the working mode; Step S3: During the iron-out process, the fan enters the working mode, and the fan parameter intelligent control module continuously determines the converted electrical signal value G. If the converted electrical signal value G continues to increase over time, the fan working mode is maintained. If the converted electrical signal value G no longer changes over time, step S4 is entered; Step S4: After the molten iron ladle is filled with molten iron, it starts to be removed. The fan parameter intelligent control module determines the size of the converted electrical signal value G. If G1<G<G2, the fan continues to be in the working mode; if G=G0, it is determined that the molten iron ladle has been removed, and the standby mode is entered, and the fan is in the off state; Among them, the fan parameter intelligent control module judges according to the weight of the molten iron ladle and outputs the result parameter value of the fan operation. The fan power and on / off status are adjusted through the fan control cabinet to realize closed-loop control of the fan operation status.

2. A method for controlling iron tapping based on the weight change of the molten iron ladle according to claim 1, It is characterized in that The low power is 20%-40% of the rated power of the fan.

3. The method for controlling the tapping of a molten iron ladle based on the weight change of the molten iron ladle according to claim 1, It is characterized in that When the converted electrical signal value G does not increase with time, it indicates that no more molten iron is flowing into the ladle, and it is judged that the molten iron is full.

4. The method for controlling the tapping of a molten iron ladle based on the weight change of the molten iron ladle according to claim 1, It is characterized in that The weighing sensor is replaced by an infrared camera for testing the tap hole temperature, and the infrared camera is used to convert the temperature signal into an electrical signal.

5. A tapping control system based on the weight change of the molten iron ladle, It is characterized in that The iron tapping control method for any one of claims 1 to 4 comprises a molten iron ladle, a weighing sensor for converting the weight signal of the molten iron ladle into an electrical signal, a fan parameter intelligent control module for judging the weight of the molten iron ladle, a fan control cabinet for adjusting the fan power, a fan and a smoke hood; the molten iron ladle is located above the weighing sensor; and The weighing sensor, the fan parameter intelligent control module, the fan control cabinet and the fan are connected in sequence through a communication method, and the smoke hood is connected to the fan.

6. A tapping control system based on the weight change of the molten iron ladle according to claim 5, It is characterized in that It also includes an ore-fired furnace, the tapping port of which is correspondingly arranged above the opening of the iron ladle.

7. A tapping control system based on the weight change of the molten iron ladle according to claim 5, It is characterized in that It also includes a flue, which is arranged between the smoke hood and the fan, and smoke enters the smoke hood through the flue.

8. A tapping control system based on the weight change of the molten iron ladle according to claim 5, It is characterized in that The weighing sensor is fixed on the running track of the molten iron ladle below the iron outlet, and converts the weight of the molten iron ladle into an electrical signal.

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