Bottom blowing smelting furnace pulverized coal injection system capable of being monitored in real time

Abstract

The invention relates to the technical field of smelting furnaces. In order to solve the problems that in the prior art, whether the mixing proportion of pulverized coal and oxygen-enriched air is proper or not and whether the working state of a mixing device is normal or not cannot be monitored in real time, the situation of uneven mixing is easily caused, and the reaction effect is affected, the invention provides the bottom blowing smelting furnace pulverized coal injection system capable of being monitored in real time. The system comprises a mixing device, wherein a stirring motor M and a mixing tank are arranged in the mixing device; the control system is connected with the mixing device, and the control system automatically controls starting and stopping of the stirring motor M by detecting the concentration of the pulverized coal in the mixing tank. The control system is connected with the mixing device, so that the concentration of the pulverized coal in the mixing tank can be detected in real time, and the stirring motor M is automatically controlled to start and stop. And after the pulverized coal and the oxygen-enriched air are fully mixed, the stirring motor M stops, so that the mixing uniformity of the pulverized coal and the oxygen-enriched air is ensured, and the mixing uniformity of the pulverized coal and the oxygen-enriched air is ensured.

Description

Technical Field

[0001] This invention relates to the field of smelting furnace technology, and in particular to a bottom-blown pulverized coal injection system for a smelting furnace that can be monitored in real time. Background Technology

[0002] Chinese utility model patent (title: "A bottom-blown pulverized coal injection system for a smelting furnace", announcement number: CN217083289 U, announcement date: 2022.07.29) discloses a bottom-blown pulverized coal injection system for a smelting furnace, which mainly includes a mixing tank, a first pipe for conveying oxygen-enriched air, a feeding device for conveying pulverized coal into the first pipe, and a second pipe connected to the smelting furnace. Both the first pipe and the second pipe are connected to the mixing tank. A mixing device is provided inside the mixing tank, and the mixing device includes a stirring component and a second driving component for driving the stirring component to rotate.

[0003] However, the bottom-blown pulverized coal injection system of this furnace cannot monitor in real time whether the mixing ratio of pulverized coal and oxygen-enriched air is appropriate, or whether the working status of the mixing device is normal, which can easily lead to uneven mixing and affect the reaction effect. Summary of the Invention

[0004] To address the problem in existing technologies that cannot monitor in real time whether the mixing ratio of pulverized coal and oxygen-enriched air is appropriate, and whether the working status of the mixing device is normal, which easily leads to uneven mixing and affects the reaction effect, this invention provides a bottom-blown pulverized coal injection system for smelting furnaces that can be monitored in real time.

[0005] The technical solution adopted in this invention is:

[0006] A real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace, comprising:

[0007] The mixing device includes a stirring motor M and a mixing tank.

[0008] The control system is connected to the mixing device. The control system automatically controls the start and stop of the stirring motor M by detecting the concentration of pulverized coal in the mixing tank.

[0009] Furthermore, the control system includes:

[0010] A concentration sensor is installed inside the mixing tank to detect the concentration of pulverized coal within the tank.

[0011] The motor drive module is connected to the stirring motor M. The motor drive module sends a motor drive signal to drive the stirring motor M.

[0012] The controller is connected to the concentration sensor to receive the pulverized coal concentration value transmitted from the sensor; the controller is also connected to the motor drive module to send motor drive signals to the motor drive module.

[0013] Furthermore, the controller is connected to a display screen to show the current concentration of pulverized coal in the mixing tank.

[0014] Furthermore, the controller uses an STM32 microcontroller.

[0015] Furthermore, the motor drive module includes a current-limiting resistor R3, a light-emitting diode LED1, and a light-emitting diode LED2 connected in sequence;

[0016] Phototransistor PT1, phototransistor PT2, and current-limiting resistor R1 are connected in sequence.

[0017] The phototransistor PT3, phototransistor PT4, and current-limiting resistor R2 are connected in sequence, followed by current-limiting resistor R4, LED3, and LED4.

[0018] A controllable switch SW and a stirring motor M are connected in series between the emitter of phototransistor PT1 and the emitter of phototransistor PT3.

[0019] Among them, the cathode of LED2, current-limiting resistors R1 and R2, and the cathode of LED4 are grounded; current-limiting resistors R3 and R4 are connected to the controller.

[0020] The controllable switch SW is connected to the controller;

[0021] LED1 and PT1 form an optocoupler pair;

[0022] LED2 and PT2 form an optocoupler pair.

[0023] The light-emitting diode LED3 and the phototransistor PT3 form an optocoupler pair;

[0024] The light-emitting diode LED4 and the phototransistor PT4 form an optocoupler pair;

[0025] Phototransistors PT1 and PT4 are NPN type phototransistors when they are turned on;

[0026] Phototransistors PT2 and PT3 are PNP type phototransistors when they are turned on;

[0027] Current-limiting resistors R1, R2, R3, and R4 are used to prevent excessive current in the corresponding circuits.

[0028] Furthermore, the current-limiting resistors R1 and R2 are replaced with variable resistors.

[0029] Furthermore, the controllable switch SW is an electronic switch.

[0030] Furthermore, an NOT gate is connected in series between LED1 and LED2, and between LED3 and LED4; all phototransistors are replaced with photoresistors.

[0031] Furthermore, a filter capacitor is connected in parallel with each of the current-limiting resistors R1 and R2.

[0032] Furthermore, a filter capacitor is connected in parallel with all the variable resistors.

[0033] The beneficial effects of this invention are:

[0034] The bottom-blown pulverized coal injection system for a smelting furnace provided by this invention, through the connection of a control system and a mixing device, can detect the concentration of pulverized coal in the mixing tank in real time and automatically control the start and stop of the stirring motor M. Once the pulverized coal and oxygen-enriched air are fully mixed, the stirring motor M stops, thereby ensuring the uniformity of the mixing between the pulverized coal and the oxygen-enriched air. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is the first circuit connection method for the motor drive module;

[0037] Figure 2 This is the second circuit connection method for the motor drive module;

[0038] Figure 3 This is the third circuit connection method for the motor drive module;

[0039] Figure 4 This is the fourth circuit connection method for the motor drive module. Detailed Implementation

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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, they should not be construed as limitations on this invention.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention.

[0042] The embodiments of the invention will now be described in detail with reference to the accompanying drawings.

[0043] The present invention provides a bottom-blown pulverized coal injection system for a smelting furnace that can be monitored in real time, including a mixing device and a control system.

[0044] The mixing device is equipped with a stirring motor M and a mixing tank. The specific structure of the mixing device, stirring motor M and mixing tank can be referred to the bottom-blown pulverized coal injection system of the bottom-blown smelting furnace disclosed in Chinese Patent (title: A bottom-blown pulverized coal injection system for a smelting furnace, announcement number: CN 217083289 U, announcement date: 2022.07.29).

[0045] The control system is connected to the mixing device. The control system automatically controls the start and stop of the stirring motor M by detecting the concentration of pulverized coal in the mixing tank. The stirring motor M stops when the pulverized coal and oxygen-enriched air are fully mixed (within the normal range).

[0046] The beneficial effects of the above technical solution are as follows: By connecting the control system to the mixing device, the concentration of pulverized coal in the mixing tank can be detected in real time, and the start and stop of the stirring motor M can be automatically controlled. Once the pulverized coal and oxygen-enriched air are fully mixed, the stirring motor M stops, thus ensuring the uniformity of the mixing and avoiding the problem of uneven mixing affecting the reaction effect.

[0047] Furthermore, the control system includes a concentration sensor, a motor drive module, and a controller.

[0048] A concentration sensor is installed inside the mixing tank to detect the concentration of pulverized coal inside the mixing tank;

[0049] The motor drive module is connected to the stirring motor M, and the motor drive module sends a motor drive signal to drive the stirring motor M.

[0050] The controller is connected to the concentration sensor to receive the pulverized coal concentration value transmitted from the sensor; the controller is also connected to the motor drive module, and sends motor drive signals to the motor drive module.

[0051] When the concentration sensor detects that the concentration of pulverized coal in the mixing tank is within the normal range, the controller sends a motor start signal from the motor drive signal to the motor drive module, which then controls the stirring motor M to start. When the concentration sensor detects that the concentration of pulverized coal in the mixing tank is outside the normal range, the controller sends a motor stop signal from the motor drive signal to the motor drive module, which then controls the stirring motor M to stop.

[0052] Furthermore, the controller is connected to a display screen to show the current concentration of pulverized coal in the mixing tank.

[0053] Furthermore, the controller uses an STM32 microcontroller.

[0054] Furthermore, as shown in the appendix Figure 1 As shown, the motor drive module includes a current-limiting resistor R3, an LED1, and an LED2 connected in sequence; a phototransistor PT1, a phototransistor PT2, and a current-limiting resistor R1 connected in sequence; a phototransistor PT3, a phototransistor PT4, and a current-limiting resistor R2 connected in sequence; and a current-limiting resistor R4, an LED3, and an LED4 connected in sequence.

[0055] A controllable switch SW and a stirring motor M are connected in series between the emitter of phototransistor PT1 and the emitter of phototransistor PT3.

[0056] Among them, the cathode of LED2, current-limiting resistors R1 and R2, and the cathode of LED4 are grounded; current-limiting resistors R3 and R4 are connected to the controller.

[0057] The controllable switch SW is connected to the controller;

[0058] LED1 and PT1 form an optocoupler; the optocoupler provides electrical isolation.

[0059] LED2 and PT2 form an optocoupler pair.

[0060] The light-emitting diode LED3 and the phototransistor PT3 form an optocoupler pair;

[0061] The light-emitting diode LED4 and the phototransistor PT4 form an optocoupler pair;

[0062] Phototransistors PT1 and PT4 are NPN type phototransistors when they are turned on;

[0063] Phototransistors PT2 and PT3 are PNP type phototransistors when they are turned on;

[0064] Current-limiting resistors R1, R2, R3, and R4 are used to prevent excessive current in the corresponding circuits.

[0065] The working principle of this motor drive module is as follows:

[0066] If the stirring motor M can only rotate in one direction, the controller outputs a high level and enters the circuit of the current limiting resistor R3, LED1, and LED2.

[0067] The controller outputs a low level, which enters the circuit of current-limiting resistor R4, LED3, and LED4;

[0068] At this time, phototransistors PT1 and PT4 are turned on, while phototransistors PT2 and PT3 are turned off.

[0069] When the controller outputs a closed switch signal, it enters the controllable switch SW. The current flows from VCC through the phototransistor PT1, the controllable switch SW, the stirring motor M, the phototransistor PT4, and the current-limiting resistor R2 to ground, and the stirring motor M starts. When the controller outputs an open switch signal, it enters the controllable switch SW, and the stirring motor M stops.

[0070] If the stirring motor M can only rotate in both directions, and it is necessary for the stirring motor M to rotate in the opposite direction, the controller outputs a low level and enters the circuit of the current limiting resistor R3, LED1, and LED2.

[0071] The controller outputs a high level and enters the circuit of current-limiting resistor R4, LED3, and LED4;

[0072] At this time, phototransistors PT1 and PT4 are cut off, while phototransistors PT2 and PT3 are turned on.

[0073] When the controller outputs a closed switch signal, it enters the controllable switch SW. The current flows from VCC through the phototransistor PT3, the stirring motor M, the controllable switch SW, the phototransistor PT2, and the current-limiting resistor R1 to ground, and the stirring motor M starts. When the controller outputs an open switch signal, it enters the controllable switch SW, and the stirring motor M stops.

[0074] Furthermore, as shown in the appendix Figure 2As shown, the current-limiting resistors R1 and R2 are replaced with variable resistors. The current-limiting resistor R1 is replaced with a variable resistor VR1, and the current-limiting resistor R2 is replaced with a variable resistor VR2. These are used to adjust the current in the circuit containing the stirring motor M, thereby adjusting the speed of the stirring motor M and matching the rated current of different models of stirring motor M.

[0075] Furthermore, in order to improve the response speed of the controllable switch, the controllable switch SW is an electronic switch.

[0076] Furthermore, as shown in the appendix Figure 1 Appendix Figure 2 As shown, LED1 and LED2 are connected in series with a NOT gate, and LED3 and LED4 are connected in series with a NOT gate; all phototransistors are replaced with photoresistors.

[0077] Phototransistors PT1, PT2, PT3, and PT4 are replaced with photoresistors LDR1, LDR2, LDR3, and LDR4, respectively.

[0078] The photoresistor scheme is similar to the phototransistor scheme, but to ensure that photoresistors LDR1 and LDR2 do not conduct simultaneously, LED1 and LED2 cannot light up at the same time. Therefore, NOT gate NOT1 is connected in series between LED1 and LED2. To ensure that photoresistors LDR3 and LDR4 do not conduct simultaneously, LED3 and LED4 cannot light up at the same time. Therefore, NOT gate NOT2 is connected in series between LED3 and LED4.

[0079] Furthermore, as shown in the appendix Figure 1 As shown, the controllable switch current-limiting resistors R1 and R2 are each connected in parallel with a filter capacitor. The current-limiting resistor R1 is connected in parallel with the filter capacitor C1, and the current-limiting resistor R2 is connected in parallel with the filter capacitor C2, which are used to filter out high-frequency noise.

[0080] Furthermore, as shown in the appendix Figure 2 As shown, all variable resistors are connected in parallel with a filter capacitor. Variable resistor VR1 is connected in parallel with filter capacitor C3, and variable resistor VR2 is connected in parallel with filter capacitor C4, used to filter out high-frequency noise.

Claims

1. A bottom-blown pulverized coal injection system for a smelting furnace with real-time monitoring capability, characterized in that, include: The mixing device includes a stirring motor M and a mixing tank. The control system is connected to the mixing device. The control system automatically controls the start and stop of the stirring motor M by detecting the concentration of pulverized coal in the mixing tank.

2. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 1, characterized in that, The control system includes: A concentration sensor is installed inside the mixing tank to detect the concentration of pulverized coal within the tank. The motor drive module is connected to the stirring motor M. The motor drive module sends a motor drive signal to drive the stirring motor M. The controller is connected to the concentration sensor to receive the pulverized coal concentration value transmitted from the sensor; the controller is also connected to the motor drive module to send motor drive signals to the motor drive module.

3. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 2, characterized in that, The controller is connected to a display screen to show the current concentration of pulverized coal in the mixing tank.

4. The bottom-blown pulverized coal injection system for a smelting furnace capable of real-time monitoring according to claim 2, characterized in that, The controller uses an STM32 microcontroller.

5. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 2, characterized in that, The motor drive module includes a current-limiting resistor R3, a light-emitting diode LED1, and a light-emitting diode LED2 connected in sequence. Phototransistor PT1, phototransistor PT2, and current-limiting resistor R1 are connected in sequence. The phototransistor PT3, phototransistor PT4, and current-limiting resistor R2 are connected in sequence, followed by current-limiting resistor R4, LED3, and LED4. A controllable switch SW and a stirring motor M are connected in series between the emitter of phototransistor PT1 and the emitter of phototransistor PT3. Among them, the cathode of LED2, current-limiting resistors R1 and R2, and the cathode of LED4 are grounded; current-limiting resistors R3 and R4 are connected to the controller. The controllable switch SW is connected to the controller; LED1 and PT1 form an optocoupler pair; LED2 and PT2 form an optocoupler pair. The light-emitting diode LED3 and the phototransistor PT3 form an optocoupler pair; The light-emitting diode LED4 and the phototransistor PT4 form an optocoupler pair; Phototransistors PT1 and PT4 are NPN type phototransistors when they are turned on; Phototransistors PT2 and PT3 are PNP type phototransistors when they are turned on; Current-limiting resistors R1, R2, R3, and R4 are used to prevent excessive current in the corresponding circuits.

6. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 5, characterized in that, The current-limiting resistors R1 and R2 are replaced with variable resistors.

7. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 5 or 6, characterized in that, The controllable switch SW is an electronic switch.

8. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 5 or 6, characterized in that, A NOT gate is connected in series between LED1 and LED2, and a NOT gate is connected in series between LED3 and LED4; all phototransistors are replaced with photoresistors.

9. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 5, characterized in that, A filter capacitor is connected in parallel with each of the current-limiting resistors R1 and R2.

10. The real-time monitorable bottom-blown pulverized coal injection system for a smelting furnace according to claim 6, characterized in that, All variable resistors are connected in parallel with a filter capacitor.

Images