Pyrite weight loss injection system for a fumace

Abstract

The utility model discloses a pyrite weight loss type injection system for fuming furnace relates to metallurgical equipment technical field, and this system includes injection tank, two stage isolated feeding unit, weightlessness measurement unit, double -outlet rotary feeder and control system, and two stage isolated feeding unit is isolated through soft connection and is made of two feeding dome valve, and injection tank constitutes independent weighing bin, and weightlessness measurement unit monitors the weight of the material in the tank in real time, and double -outlet rotary feeder is directly driven by frequency conversion motor, and its rotating speed is adjusted in real time according to weightlessness signal by control system to control the amount of feeding. Realized the decoupling of injection process and tank pressure, ensured the injection precision and adjustability, and the cylinder type screen of rotation setting realized dynamic screening filtration on one hand, made the material pass more smoothly, can cooperate the crushing tooth block to extrude and crush the large particle size material of interception into smaller particle size material simultaneously, thereby smoothly passed through the screen hole and fell into the injection tank, and manual cleaning is not needed.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a weightless injection system for pyrite in a fuming furnace. Background Technology

[0002] In the smelting process of non-ferrous metals in a fuming furnace, pyrite needs to be precisely added to the molten pool as a sulfiding agent to promote the volatilization and enrichment of valuable metals such as lead and zinc. The traditional conveyor belt method of adding pyrite for sulfidation and reduction results in sulfur falling from the top of the furnace into the molten pool, which leads to combustion and waste. At the same time, the slag water quenching process generates exhaust gas that pollutes the atmosphere.

[0003] Currently, the pyrite loss-in-weight injection equipment used in fuming furnaces allows for precise control of the solid reducing agent feed rate, and the start-up, shutdown, and feed rate control can be operated via computer. A search revealed, for example, a pulverized coal injection device for a flue gas fume furnace, as disclosed in patent publication number CN204829989U. This device includes an airlock tank, an air jet tank, a constant-volume rotary feeder, and a weighing module. The airlock tank includes an airlock tank, an inlet dome valve, a high-level switch, a fluidizing valve, and a gas distribution pipeline (a) connected to it. The top of the airlock tank is connected to the isolation dome valve via a flexible joint, and a manual gate valve is also installed on the isolation dome valve. The air jet tank includes an air jet tank, a level switch, a connecting pipe, and a gas distribution pipeline (b) connected to it. The air jet tank is installed at the bottom of the airlock tank, and an inlet dome valve is installed at the top of the air jet tank. The connecting pipe is connected to the constant-volume rotary feeder via the fluidizing valve. The weighing module is installed on the lower side of the air jet tank. This design ensures stable operation of the conveying system and effectively prevents blockages, while also improving conveying efficiency.

[0004] Based on the above search and the findings of existing technologies, existing injection equipment similar to those disclosed above generally uses a screen at the feed inlet to filter out larger solid reducing agents. However, the larger solid reducing agents accumulate on the screen surface, hindering material flow. Therefore, a weightless injection system for pyrite in a fuming furnace is proposed to improve the above-mentioned problems. Utility Model Content

[0005] The purpose of this application is to provide a weightless injection system for pyrite in a fuming furnace to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a weightless injection system for pyrite in a fuming furnace, comprising: The blowing tank is vertically arranged axially. The top of the blowing tank is equipped with a feed inlet and a crushing mechanism including a crushing screen is provided at the feed inlet. The bottom of the blowing tank is equipped with a discharge outlet. A dual-stage isolation feeding unit is installed at the feed inlet and located below the crushing screen to open and close the feed inlet. The loss-in-weight metering unit supports the injection tank and is used to collect the weight signal of the material inside the injection tank in real time. A dual-outlet rotary feeder is installed at the outlet of the blow-jet can. A drive unit that drives the dual-outlet rotary feeder to rotate horizontally is also installed at the bottom of the blow-jet can. The control system is connected to the loss-in-weight metering unit and the drive unit. The control system receives the weight signal of the material inside the blowing tank collected by the loss-in-weight metering unit, and controls the feeding amount of the dual-outlet rotary feeder by adjusting the rotation speed of the drive unit according to the preset batch weight and blowing speed.

[0007] As a further supplement to this solution, the horizontal section of the blow-off can located at the crushing mechanism is a rectangular structure, and the crushing mechanism also includes a drive motor, a gearbox, and transmission gears; The gearbox is installed on the side of the feed inlet, and the drive motor is installed on the gearbox. There are two transmission gears and two crushing screens. The two crushing screens are horizontally and side by side and rotate inside the feed inlet. The two transmission gears are coaxially fixed with the two crushing screens respectively, and the two transmission gears mesh with each other. One of the transmission gears is coaxially fixed with the output end of the drive motor.

[0008] As a further supplement to this solution, the crushing screen includes a cylindrical screen, multiple screen holes equidistantly arranged on the circumferential side of the cylindrical screen, and multiple integrated crushing teeth blocks equidistantly distributed on the outer circumferential surface of the cylindrical screen. The screen holes and crushing teeth blocks are staggered, and the multiple crushing teeth blocks on the two crushing screens are staggered along their rotation axis.

[0009] As a further supplement to this solution, the sieve openings located inside the cylindrical sieve are chamfered.

[0010] As a further supplement to this solution, the dual-stage isolation feeding unit includes a manual isolation valve, a first dome valve, a first flexible connector, and a second dome valve arranged in series from top to bottom. Both the first dome valve and the second dome valve adopt an air-expansion sealing structure.

[0011] As a further supplement to this solution, the weight loss metering unit includes at least three weighing sensors supported at the bottom of the injection tank.

[0012] As a further supplement to this solution, the drive unit includes a variable frequency motor, and the dual-outlet rotary feeder is directly driven to rotate by the variable frequency motor.

[0013] As a further supplement to this solution, the top of the injection tank is also equipped with an exhaust dome valve and a high-level switch, and the outlet pipe diameter of the exhaust dome valve is smaller than the inlet pipe diameter.

[0014] As a further supplement to this solution, the dual-outlet rotary feeder is equipped with two outlets. Each outlet is connected in sequence to a discharge shut-off valve and a second flexible connector via a pipe, and is ultimately connected to a jetting pipe via a pipe.

[0015] As a further supplement to this solution, a fluidization unit is also provided at the bottom of the injection tank, which is used to introduce fluidizing air into the material inside the injection tank during the injection process.

[0016] In summary, the technical effects and advantages of this utility model are as follows: 1. In this utility model, a weightless closed-loop control is adopted, which fundamentally eliminates the influence of tank pressure fluctuation on the feed rate. The injection accuracy can reach ±1%, which is much higher than the traditional method (±5%), ensuring the stability of the chemical reaction and the metal recovery rate. Through frequency conversion speed regulation, the feed speed can be continuously and linearly adjusted precisely within a wide range. It has a fast response speed, extremely high flexibility, and perfectly adapts to the needs of process fluctuations.

[0017] 2. In this utility model, the combination of the two-stage dome valve and the flexible connection not only ensures the reliability of the seal, but also creates conditions for accurate metering; it realizes the fully automated operation from automatic loading, metering, blowing to the end of replenishment, reduces manual intervention and improves production efficiency.

[0018] 3. In this utility model, the rotating cylindrical screen achieves dynamic screening and filtration, making the material pass through more smoothly. At the same time, it increases the number of screen holes, which helps to reduce the overall clogging rate of the cylindrical screen. In addition, the relative rotation of the two cylindrical screens can work with the crushing teeth to squeeze the intercepted large-diameter material, breaking the large-diameter material into smaller-diameter material, so that it can pass smoothly through the screen holes and fall into the spray tank without manual cleaning. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the system structure in this embodiment; Figure 2 This is a schematic diagram of the structure of the crushing mechanism in this embodiment; Figure 3This is a schematic diagram of a partial cross-sectional structure of the crushing screen in this embodiment.

[0021] In the diagram: 1. Pulse-jet tank; 2. Dual-outlet rotary feeder; 3. Manual shut-off valve; 4A. First dome valve; 4B. Second dome valve; 5. First flexible connector; 6. Weighing sensor; 7. Variable frequency motor; 8. Pulse-jet pipe; 9. Crusher screen; 91. Cylindrical screen; 92. Screen aperture; 93. Crusher teeth; 94. Chamfer; 10. MCC cabinet; 11. High level switch; 12. Exhaust dome valve; 13. Second flexible connector; 14. Discharge shut-off valve; 15. Balancing pipe; 16. Fluidization unit; 17. Drive motor; 18. Gearbox; 19. Transmission gear. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0023] Example 1: Reference Figure 1-3 The illustrated pyrite loss-in-weight injection system for a fuming furnace includes an injection tank 1, a two-stage isolated feeding unit, a loss-in-weight metering unit, a dual-outlet rotary feeder 2, and a control system. For example, the system is configured to perform batch injection operations with a single batch injection volume of 2.5 tons, an injection duration of 50 minutes, and an injection speed that is continuously adjustable in the range of 10 kg / min to 60 kg / min.

[0024] The injection tank 1 is vertically oriented and can be designed according to pressure vessel standards, for example, with a volume of 2.0 m³ and a design pressure of 0.7 MPa. The top of the injection tank 1 is provided with a feed inlet, and the feed inlet is equipped with a crushing mechanism including a crushing screen 9. The bottom of the injection tank 1 is provided with a discharge outlet. Specifically, the horizontal section of the injection tank 1 located at the crushing mechanism is a rectangular structure. The crushing mechanism also includes a drive motor 17, a gearbox 18, and a transmission gear 19. The gearbox 18 is installed on the side of the feed inlet, and the drive motor 17 is installed on the gearbox 18. There are two transmission gears 19 and two crushing screens 9. The two crushing screens 9 are horizontally and rotatably installed on the inner side of the feed inlet. The two transmission gears 19 are coaxially fixed with the two crushing screens 9 respectively, and the two transmission gears 19 mesh with each other. One of the transmission gears 19 is coaxially fixed with the output end of the drive motor 17.

[0025] Regarding the aforementioned crushing screen 9, specifically, the crushing screen 9 includes a cylindrical screen 91, multiple screen holes 92 equidistantly arranged on the circumferential side of the cylindrical screen 91, and multiple integrated crushing tooth blocks 93 equidistantly distributed on the outer circumferential surface of the cylindrical screen 91. The screen holes 92 and the crushing tooth blocks 93 are staggered, and the multiple crushing tooth blocks 93 on the two crushing screens 9 are staggered along their rotation axis.

[0026] The rotating cylindrical screen 91 achieves dynamic screening and filtration, making material passage smoother. It also increases the number of screen holes 92, which helps reduce the overall clogging rate of the cylindrical screen 91. Furthermore, the two cylindrical screens 91 rotate relative to each other (e.g., Figure 3 (As shown by the dashed arrow in the middle), it can work with the crushing toothed block 93 to squeeze the intercepted large-diameter material, so that the large-diameter material is crushed into smaller-diameter material, and thus smoothly passes through the screen hole 92 and falls into the spray tank 1 without manual cleaning.

[0027] Among them, the screen hole 92 is provided with a chamfer 94 at the opening inside the cylindrical screen 91. The chamfer 94 makes the material discharge inside the cylindrical screen 91 smoother.

[0028] The dual-stage isolation feeding unit is located at the feed inlet and below the crushing screen 9. It is used to open and close the feed inlet. Specifically, the dual-stage isolation feeding unit includes a manual isolation valve 3, a first dome valve 4A, a first flexible connector 5, and a second dome valve 4B, which are connected in series from top to bottom. Both the first dome valve 4A and the second dome valve 4B adopt an air-expansion sealing structure.

[0029] The aforementioned dual-stage isolation feeding unit is the structural basis for achieving accurate metering. It isolates the first dome valve 4A and the second dome valve 4B in series through a conventional first flexible connector 5, making the entire injection tank 1 an independently suspended weighing bin, effectively eliminating the interference of upstream bin structure and pressure on the weighing signal.

[0030] The loss-in-weight metering unit supports the blow-up tank 1 and is used to collect the weight signal of the material inside the blow-up tank 1 in real time. Specifically, the loss-in-weight metering unit includes at least three weighing sensors 6 supported at the bottom of the blow-up tank 1, which monitor the weight change rate of the blow-up tank 1 in real time through high-precision weighing sensors 6.

[0031] The dual-outlet rotary feeder 2 is installed at the outlet of the spray tank 1. The bottom of the spray tank 1 is also equipped with a drive unit that drives the dual-outlet rotary feeder 2 to rotate horizontally. Specifically, the drive unit includes a variable frequency motor 7. The dual-outlet rotary feeder 2 is directly driven to rotate by the variable frequency motor 7, so that the feeding amount is directly determined by the speed of the variable frequency motor 7 and is basically independent of the pressure inside the tank. The dual-outlet rotary feeder 2 is provided with two outlets. Each outlet is connected to a discharge shut-off valve 14 and a second flexible connector 13 in sequence through a pipe, and finally connected to the spray pipe 8 through a pipe.

[0032] The control system is connected to the loss-in-weight metering unit and the drive unit. The control system receives the weight signal of the material inside the blowing tank 1 collected by the loss-in-weight metering unit, and controls the feeding amount of the dual-outlet rotary feeder 2 by adjusting the rotation speed of the dual-outlet rotary feeder 2 driven by the drive unit according to the preset batch weight and blowing speed. The control system adopts the loss-in-weight method principle and calculates the actual feeding rate by calculating the reduction of the weight of the blowing tank 1 per unit time (ΔW / Δt) in real time. The control system compares this actual rate with the preset rate and dynamically adjusts the output frequency of the variable frequency motor 7 through the PID algorithm, thereby forming a closed-loop control to ensure that the feeding rate is constant at the set value.

[0033] Specifically, the control core of the control system consists of a conventional pneumatic solenoid valve box 9 and an MCC cabinet 10. The frequency converter in the MCC cabinet 10 receives the speed command signal from the control system and feeds back the actual speed. The pneumatic solenoid valve box 9 drives the action of all valves according to the control command.

[0034] In addition, the top of the blow tank 1 is also equipped with an exhaust dome valve 12 and a high material level switch 11. The outlet pipe diameter of the exhaust dome valve 12 is smaller than the inlet pipe diameter. The bottom of the blow tank 1 is also equipped with a fluidization unit 16, which is used to introduce fluidizing air into the material inside the blow tank 1 during the blowing process. The fluidizing air is evenly distributed at the bottom of the blow tank 1.

[0035] In addition, the bottom outlet of the dual-outlet rotary feeder 2 is connected to the top of the spray tank 1 through the balance pipe 15; when fluidizing air is introduced into the spray tank 1, its internal pressure is balanced with the pressure of the spray pipe 8, effectively eliminating the interference of tank pressure fluctuation on the weighing signal.

[0036] Working principle of this utility model: Loading: System initialization, open exhaust dome valve 12, the pressure inside spray tank 1 is less than 0.03 MPa, then open the second dome valve 4B, and then open the first dome valve 4A. The material fills spray tank 1 by gravity; after reaching the high material level, close all valves and the system measures the net weight. Preparation: The operator sets the total amount to be sprayed in this batch (e.g., 2500 kg) and the spraying rate (e.g., 50 kg / min); Injection: When the system is started, the air supply is turned on, and the pyrite powder in the injection tank 1 is fully fluidized by the air introduced through the fluidization unit 16. When the pressure in the injection tank 1 is greater than or equal to that in the injection pipeline 8, the discharge shut-off valve 14 is opened. The control system outputs the corresponding frequency to the variable frequency motor 7 according to the set injection rate, and starts the dual-outlet rotary feeder 2. The pyrite flows into the injection pipeline 8 through the rotor of the dual-outlet rotary feeder 2 below by gravity. The system continuously monitors the weight loss and finely adjusts the speed of the variable frequency motor 7 through PID calculation to keep the actual feed rate constant. End: When the weight of the material in the injection tank 1 drops to the target value, the control system stops the variable frequency motor 7, and after a delay of several seconds, shuts off the conveying air to empty the pipeline. Subsequently, the system automatically enters the next round of loading procedure.

[0037] It should be noted that the specific models and specifications of the electrical equipment involved in this solution need to be selected and determined based on the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, so they will not be described in detail here. The power supply and principles of the electrical equipment involved are clear to those skilled in the art, and will not be described in detail here.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A weightless injection system for pyrite in a fuming furnace, characterized in that: include: The spray tank (1) is vertically arranged in the axial direction. The top of the spray tank (1) is provided with a feed inlet, and the feed inlet is provided with a crushing mechanism including a crushing screen (9). The bottom of the spray tank (1) is provided with a discharge outlet. A dual-stage isolation feeding unit is provided at the feed inlet and located below the crushing screen (9) for opening and closing the feed inlet; Weight loss metering unit, which supports the blow-off tank (1) and is used to collect the weight signal of the material inside the blow-off tank (1) in real time; A dual-outlet rotary feeder (2) is installed at the outlet of the blow tank (1). The bottom of the blow tank (1) is also equipped with a drive unit that drives the dual-outlet rotary feeder (2) to rotate horizontally. The control system is connected to the loss-in-weight metering unit and the drive unit. The control system receives the weight signal of the material inside the blow tank (1) collected by the loss-in-weight metering unit, and controls the feeding amount of the dual-outlet rotary feeder (2) by adjusting the rotation speed of the dual-outlet rotary feeder (2) driven by the drive unit according to the preset batch weight and blowing speed.

2. The pyrite loss-in-weight injection system for a fuming furnace according to claim 1, characterized in that: The horizontal section of the blow-off tank (1) located at the crushing mechanism is a rectangular structure. The crushing mechanism also includes a drive motor (17), a gearbox (18), and a transmission gear (19). The gearbox (18) is installed on the side of the feed inlet, and the drive motor (17) is installed on the gearbox (18). There are two transmission gears (19) and two crushing screens (9). The two crushing screens (9) are horizontally and rotatably installed on the inside of the feed inlet. The two transmission gears (19) are coaxially fixed with the two crushing screens (9) respectively. The two transmission gears (19) mesh with each other. One of the transmission gears (19) is coaxially fixed with the output end of the drive motor (17).

3. A weightless injection system for pyrite in a fuming furnace according to claim 2, characterized in that: The crushing screen (9) includes a cylindrical screen (91), a plurality of screen holes (92) equidistantly arranged on the circumferential side of the cylindrical screen (91), and a plurality of crushing teeth (93) integrally and equidistantly distributed on the outer circumferential surface of the cylindrical screen (91). The screen holes (92) and the crushing teeth (93) are staggered, and the plurality of crushing teeth (93) on the two crushing screens (9) are staggered along their rotation axis.

4. A pyrite loss-in-weight injection system for a fuming furnace according to claim 3, characterized in that: The sieve hole (92) is provided with a chamfer (94) at the opening inside the cylindrical sieve (91).

5. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The dual-stage isolation feeding unit includes a manual isolation valve (3), a first dome valve (4A), a first flexible connector (5), and a second dome valve (4B) arranged in series from top to bottom. Both the first dome valve (4A) and the second dome valve (4B) adopt an inflatable expansion sealing structure.

6. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The weight loss metering unit includes at least three weighing sensors (6) supported on the bottom of the spray tank (1).

7. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The drive unit includes a variable frequency motor (7), and the dual-outlet rotary feeder (2) is directly driven to rotate by the variable frequency motor (7).

8. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The top of the blow tank (1) is also provided with an exhaust dome valve (12) and a high material level switch (11), and the outlet pipe diameter of the exhaust dome valve (12) is smaller than the inlet pipe diameter.

9. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The dual-outlet rotary feeder (2) is provided with two outlets. Each outlet is connected to a discharge shut-off valve (14) and a second flexible connector (13) in sequence through a pipe, and is finally connected to the blow pipe (8) through a pipe.

10. A weightless injection system for pyrite in a fuming furnace according to claim 1, characterized in that: The bottom of the blow tank (1) is also provided with a fluidization unit (16) for introducing fluidizing air into the material inside the blow tank (1) during the blowing process.

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