Oxygen concentration adjusting device for pyrite roasting

Abstract

The utility model relates to chemical metallurgical gas regulation and control equipment technical field, concretely relates to pyrite roasting oxygen enrichment concentration adjusting device, including roasting furnace main part, is provided with oxygen enrichment concentration adjusting assembly on roasting furnace main part, and oxygen enrichment concentration adjusting assembly includes mixing cylinder, and the top board body of mixing cylinder is detachably installed with the oxygen concentration sensor inserted into the mixing cylinder, and the top cylinder body of mixing cylinder is fixedly installed with the delivery pipe, and the gas outlet end of delivery pipe and the air inlet end of roasting furnace main part are linked through the high temperature resistant pipe and communicate, and the bottom one side cylinder body of mixing cylinder is fixedly installed with the air pipe, and the air pipe is fixedly installed with the air solenoid proportional valve, and the end of air pipe is provided with frequency conversion induced draft fan, and the bottom other side cylinder body of mixing cylinder is installed with the oxygen enrichment pipe, and the oxygen enrichment pipe is fixedly installed with the oxygen enrichment pipe solenoid proportional valve, and the side of mixing cylinder is fixedly installed with control host computer. The utility model is convenient for oxygen enrichment concentration adjusting operation, and is beneficial to the smooth progress of roasting.

Description

Technical Field

[0001] This utility model relates to the field of chemical and metallurgical gas control equipment technology, specifically to a device for regulating the oxygen concentration in pyrite roasting. Background Technology

[0002] Pyrite roasting is typically carried out within a dedicated pyrite roasting apparatus. Utility model patent CN220845502U discloses such an apparatus, relating to the field of ore processing technology. This apparatus includes a furnace body with an air inlet pipe fixedly connected to its bottom, a discharge pipe fixedly connected to its top, and a feed pipe fixedly connected to one side. An internal turning device is provided within the furnace body, comprising a screw rotatably connected to the furnace body. A servo motor is fixedly connected to one side of the furnace body, with its output end fixedly connected to the screw. A moving plate is threaded onto the arc-shaped surface of the screw. Several rotating rods are rotatably connected inside the furnace body, arranged in pairs. Each pair of rotating rods is rotatably connected to the inner walls of both sides of the furnace body. This apparatus, through its turning device, aims to prevent the pyrite inside the furnace body from piling up, thus minimizing the roasting effect on the pyrite.

[0003] While the aforementioned technical solutions have their advantages, most current pyrite roasting reactors still have some shortcomings in oxygen concentration control. For example, most pyrite roasting furnaces generally roast directly by introducing oxygen-enriched gas or air. Since the core condition for pyrite roasting is the precise control of the oxygen-enriched gas concentration (usually maintained at 25%-40%), excessively high concentrations can easily lead to localized overheating and scaling within the furnace, while excessively low concentrations cause a decrease in sulfur conversion rate. For every 1% decrease in oxygen concentration, the sulfur conversion rate decreases by 2%-3%. The lack of a concentration control device in this situation will affect the roasting effect. Therefore, we propose an oxygen concentration adjustment device for pyrite roasting. Utility Model Content

[0004] The purpose of this invention is to provide a device for adjusting the oxygen concentration during pyrite roasting, so as to solve the defects mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A device for regulating the oxygen concentration in pyrite roasting includes a roasting furnace body. An oxygen concentration regulating component is installed on the roasting furnace body. The oxygen concentration regulating component includes a mixing cylinder. An oxygen concentration sensor, inserted into the mixing cylinder, is detachably installed on the top plate of the mixing cylinder. A conveying pipe is fixedly installed on the top cylinder of the mixing cylinder. The outlet end of the conveying pipe is connected to the inlet end of the roasting furnace body via a high-temperature resistant pipe. An air pipe is fixedly installed on one side of the bottom cylinder of the mixing cylinder. An air electromagnetic proportional valve is fixedly installed on the air pipe. A variable frequency induced draft fan is installed at the end of the air pipe. An oxygen enrichment pipe is fixedly installed on the other side of the bottom cylinder of the mixing cylinder. An oxygen enrichment pipe electromagnetic proportional valve is fixedly installed on the oxygen enrichment pipe. A control host is fixedly installed on the side of the mixing cylinder.

[0007] Preferably, two symmetrical partitions are fixedly installed on the inner wall of the mixing cylinder, and the two partitions divide the space inside the mixing cylinder from bottom to top into a primary mixing chamber, a secondary turbulence chamber and a final flow equalization chamber.

[0008] Preferably, a ventilation hood connecting the upper and lower chambers is fixedly installed at the center of the partition, and the inner diameter of the ventilation hood increases sequentially from top to bottom;

[0009] This feature allows the gas to flow through the ventilation hood in a sequential manner.

[0010] Preferably, multiple sets of baffles are fixedly installed on the inner wall of the intermediate baffle chamber, and the orientations of two adjacent sets of baffles are opposite.

[0011] This setting allows for more thorough air mixing within the intermediate turbulence chamber.

[0012] Preferably, both the air pipe and the oxygen-enriching pipe are connected to the primary mixing chamber, and the delivery pipe is connected to the final flow equalization chamber.

[0013] Preferably, the oxygen concentration sensor is inserted into the final flow equalization chamber, and the top wall of the final flow equalization chamber is provided with an arc-shaped guiding surface for guiding the gas to flow toward one side of the delivery pipe;

[0014] This feature allows the gas in the final flow equalization chamber to be discharged more smoothly through the delivery pipe.

[0015] Preferably, an air inlet cover is fixedly installed at the air inlet end of the air pipe, and the variable frequency induced draft fan is fixedly installed on the air inlet cover.

[0016] Preferably, a retaining ring is detachably installed at the end of the air intake shroud, and a filter screen is fixedly installed at the center of the retaining ring;

[0017] This setting can filter the incoming air.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model, through the setting of an oxygen enrichment concentration adjustment component, includes a mixing cylinder, an oxygen concentration sensor, an air electromagnetic proportional valve, an oxygen enrichment pipe electromagnetic proportional valve, and a control host. The oxygen concentration sensor monitors the gas concentration in the final stage equalization chamber in real time and feeds it back to the control host. The control host precisely controls the opening and closing degree of the two proportional valves to achieve a dynamic ratio of air and oxygen enrichment gas, stabilizing the concentration within the corresponding range. This avoids excessively high concentrations that could lead to scaling in the furnace or excessively low concentrations that could reduce the sulfur conversion rate, thereby achieving precise control of the oxygen enrichment concentration and improving the roasting effect.

[0020] 2. This utility model, through the upper and lower baffles inside the mixing cylinder, the ventilation hood, the baffle plate in the intermediate turbulence chamber, and the arc-shaped guide surface in the final flow equalization chamber, allows the gas to be initially mixed in the primary mixing chamber, then enter the intermediate turbulence chamber through the ventilation hood with a gradually increasing inner diameter, where it is fully turbulently mixed by the reverse baffle plate, and then guided to the delivery pipe by the arc-shaped guide surface. This achieves multi-level uniform mixing of the gas, avoids local uneven concentration affecting the reaction, and improves the quality of gas mixing.

[0021] 3. This utility model features an air inlet cover, a fixing ring, and a filter screen at the air inlet end of the air pipe. The filter screen filters the air drawn in by the variable frequency induced draft fan, intercepting impurities and dust. The fixing ring is detachable, making it easy to clean and replace the filter screen, preventing impurities from entering the mixing system and clogging the pipeline or affecting the accuracy of the sensor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the oxygen concentration regulating component of this utility model;

[0024] Figure 3 This is a partial structural schematic diagram of the oxygen concentration regulating component of this utility model;

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Main body of the roasting furnace;

[0027] 2. Oxygen concentration regulating component; 20. Mixing cylinder; 21. Baffle; 211. Ventilation hood; 22. Primary mixing chamber; 221. Intermediate turbulence chamber; 222. Final flow equalization chamber; 23. Baffle plate; 24. Arc-shaped guide surface; 25. Oxygen concentration sensor; 26. Control host; 27. Air pipe; 271. Air electromagnetic proportional valve; 272. Air inlet hood; 273. Variable frequency induced draft fan; 274. Filter screen; 275. Fixing ring; 28. Oxygen enrichment pipe; 281. Oxygen enrichment pipe electromagnetic proportional valve; 29. ​​Delivery pipe; 291. High temperature resistant pipe. Detailed Implementation

[0028] 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.

[0029] In the description of this utility model, 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", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Please see Figures 1-3This utility model provides a technical solution: an oxygen concentration adjustment device for pyrite roasting, including a roasting furnace body 1, an oxygen concentration adjustment component 2 on the roasting furnace body 1, an oxygen concentration adjustment component 2 including a mixing cylinder 20, an oxygen concentration sensor 25 detachably installed on the top plate of the mixing cylinder 20 and inserted into the mixing cylinder 20, a conveying pipe 29 fixedly installed on the top cylinder of the mixing cylinder 20, the gas outlet of the conveying pipe 29 is connected to the gas inlet of the roasting furnace body 1 through a high temperature resistant pipe 291, the high temperature resistant pipe 291 can withstand the high temperature generated by roasting, ensuring that the gas after proportioning is smoothly sent into the furnace, and avoiding gas leakage due to pipeline damage caused by high temperature; An air pipe 27 is fixedly installed on one side of the bottom of the mixing cylinder 20. An air electromagnetic proportional valve 271 is fixedly installed on the air pipe 27. A variable frequency induced draft fan 273 is installed at the end of the air pipe 27. An oxygen enrichment pipe 28 is fixedly installed on the other side of the bottom of the mixing cylinder 20. An oxygen enrichment pipe electromagnetic proportional valve 281 is fixedly installed on the oxygen enrichment pipe 28. A control host 26 is fixedly installed on the side of the mixing cylinder 20. An oxygen concentration sensor 25 monitors the gas concentration and feeds it back to the control host 26. The host adjusts the opening and closing degree of the two proportional valves to make the air and oxygen enrichment gas accurately matched and stabilized in the range of 25%-40%, so as to avoid abnormal concentration affecting roasting and improve sulfur conversion rate.

[0031] In this embodiment, two symmetrical baffles 21 are fixedly installed on the inner wall of the mixing cylinder 20. The two baffles 21 divide the space inside the mixing cylinder 20 from bottom to top into a primary mixing chamber 22, a middle turbulence chamber 221 and a final flow equalization chamber 222. The gas flows in a process of "preliminary mixing - full turbulence - uniform output", providing a structural basis for gas stratification mixing.

[0032] like Figure 3 As shown, a ventilation hood 211 connecting the upper and lower chambers is fixedly installed at the center of the partition 21. The inner diameter of the ventilation hood 211 increases from top to bottom, guiding the gas to flow orderly from the lower chamber into the upper chamber and ensuring smooth gas flow.

[0033] like Figure 3 As shown, multiple sets of baffles 23 are fixedly installed on the inner wall of the intermediate turbulence chamber 221. The two adjacent sets of baffles 23 are oriented in opposite directions. When the gas flows through, its flow direction is changed multiple times by the reverse baffles 23, forming turbulence, which makes the air and oxygen-enriched gas mix more fully and eliminates local concentration differences.

[0034] Specifically, air pipe 27 and oxygen enrichment pipe 28 are both connected to the primary mixing chamber 22, and delivery pipe 29 is connected to the final flow equalization chamber 222, so that the two gases first converge in the primary chamber, and after multi-stage processing, they are output from the final chamber, ensuring that the gas concentration fed into the furnace is uniform and stable.

[0035] like Figure 3As shown, the oxygen concentration sensor 25 is inserted into the final flow equalization chamber 222. The top wall of the final flow equalization chamber 222 is provided with an arc-shaped guide surface 24 for guiding the gas to flow towards the delivery pipe 29. The sensor can detect the final mixed gas concentration, and the arc-shaped guide surface 24 guides the gas to flow towards the delivery pipe 29, improving the accuracy of concentration detection and the smoothness of gas output.

[0036] like Figure 2 As shown, an air intake hood 272 is fixedly installed at the air intake end of the air pipe 27, and a variable frequency induced draft fan 273 is fixedly installed on the air intake hood 272. The variable frequency induced draft fan 273 stably draws in air through the air intake hood 272, and the variable frequency induced draft fan 273 can adjust the air volume to adapt to the mixing ratio requirements, ensuring that the air intake volume is stable and controllable.

[0037] like Figure 2 As shown, a retaining ring 275 is detachably installed at the end of the air intake hood 272. A filter screen 274 is fixedly installed at the center of the retaining ring 275. The filter screen 274 filters impurities and dust in the air. The retaining ring 275 facilitates the removal and replacement of the filter screen, preventing impurities from clogging the pipeline or affecting the accuracy of the sensor, and ensuring the stable operation of the device.

[0038] It is worth noting that when the variable frequency induced draft fan 273 starts, air is drawn into the air pipe 27 through the air intake hood 272 and filter screen 274. The control host 26 presets parameters and adjusts the initial opening degree of the air electromagnetic proportional valve 271 and the oxygen enrichment pipe electromagnetic proportional valve 281, so that the air and oxygen enrichment gas enter the primary mixing chamber 22 of the mixing cylinder 20 in proportion. The speed of the variable frequency induced draft fan 273 determines the total air intake. After the gas is mixed in the intermediate turbulence chamber 221, it enters the final flow equalization chamber 222. The oxygen concentration sensor 25 detects the oxygen concentration in real time and converts it into an electrical signal, which is transmitted to the control host 26 to form a closed-loop monitoring. The host compares the actual measurement with the standard value of 25%-40%. If the concentration is too low, the oxygen enrichment valve 281 is increased; if it is too high, the air valve 271 is increased or the oxygen enrichment valve 281 is decreased. The fan speed is simultaneously fine-tuned to stabilize the total amount until the concentration reaches the standard, thus achieving precise control.

[0039] Finally, it should be noted that the variable frequency induced draft fan 273, oxygen enrichment pipe electromagnetic proportional valve 281, oxygen concentration sensor 25, air electromagnetic proportional valve 271, corresponding control system, and external power supply of this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected by wires. The specific connection method should refer to the working principle of this utility model. The electrical connections between each electrical component are completed in the order of operation. The detailed connection methods are all technologies known in the art.

[0040] In use, the oxygen concentration regulating device for pyrite roasting of this utility model, by controlling the main unit 26 to preset the oxygen concentration standard value of 25%-40%, starts the variable frequency induced draft fan 273 on the air inlet hood 272. The air enters the air pipe 27 after being filtered by the filter screen 274. The main unit 26 adjusts the initial opening degree of the air electromagnetic proportional valve 271 and the oxygen enrichment pipe electromagnetic proportional valve 281. The air and oxygen enriched gas enter the primary mixing chamber 22 of the mixing cylinder 20 in proportion. The gas passes through the baffle 21 with the gradually increasing inner diameter of the center. Ventilation hood 211 enters intermediate turbulence chamber 221, and after being turbulent and mixed by reverse turbulence plate 23, it flows into final flow equalization chamber 222. Oxygen concentration sensor 25 inserted into final flow equalization chamber 222 detects gas concentration and transmits the signal to control host 26. The host compares the measured value with the standard value and dynamically adjusts the opening degree of the two proportional valves and the fan speed to ensure that the concentration meets the standard. Qualified gas is guided to delivery pipe 29 through arc-shaped guide surface 24 and sent into roasting furnace body 1 through high temperature resistant pipe 291 for roasting.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for regulating oxygen concentration in pyrite roasting, comprising a roasting furnace body (1), characterized in that: An oxygen concentration regulating component (2) is provided on the main body (1) of the roasting furnace. The oxygen concentration regulating component (2) includes a mixing cylinder (20). An oxygen concentration sensor (25) is detachably installed on the top plate of the mixing cylinder (20) and inserted into the mixing cylinder (20). A conveying pipe (29) is fixedly installed on the top cylinder of the mixing cylinder (20). The outlet end of the conveying pipe (29) is connected to the inlet end of the main body (1) of the roasting furnace through a high-temperature resistant pipe (291). An air pipe (27) is fixedly installed on one side of the bottom of the mixing cylinder (20), an air electromagnetic proportional valve (271) is fixedly installed on the air pipe (27), and a variable frequency induced draft fan (273) is provided at the end of the air pipe (27). An oxygen enrichment pipe (28) is fixedly installed on the other side of the bottom of the mixing cylinder (20), an oxygen enrichment pipe electromagnetic proportional valve (281) is fixedly installed on the oxygen enrichment pipe (28), and a control host (26) is fixedly installed on the side of the mixing cylinder (20).

2. The oxygen concentration regulating device for pyrite roasting according to claim 1, characterized in that: The mixing cylinder (20) has two symmetrical partitions (21) fixedly installed on its inner wall. The two partitions (21) divide the space inside the mixing cylinder (20) from bottom to top into a primary mixing chamber (22), a middle turbulence chamber (221), and a final flow equalization chamber (222).

3. The oxygen concentration regulating device for pyrite roasting according to claim 2, characterized in that: A ventilation hood (211) connecting the upper and lower chambers is fixedly installed at the center of the partition (21), and the inner diameter of the ventilation hood (211) increases from top to bottom.

4. The oxygen concentration regulating device for pyrite roasting according to claim 3, characterized in that: Multiple sets of spoilers (23) are fixedly installed on the inner wall of the intermediate spoiler chamber (221), with adjacent sets of spoilers (23) facing opposite directions.

5. The oxygen concentration regulating device for pyrite roasting according to claim 2, characterized in that: The air pipe (27) and the oxygen enrichment pipe (28) are both connected to the primary mixing chamber (22), and the delivery pipe (29) is connected to the final flow equalization chamber (222).

6. The oxygen concentration regulating device for pyrite roasting according to claim 2, characterized in that: The oxygen concentration sensor (25) is inserted into the final flow equalization chamber (222), and the top wall of the final flow equalization chamber (222) is provided with an arc-shaped guide surface (24) for guiding the gas to flow toward the side of the delivery pipe (29).

7. The oxygen concentration regulating device for pyrite roasting according to claim 1, characterized in that: An air inlet cover (272) is fixedly installed at the air inlet end of the air pipe (27), and the variable frequency induced draft fan (273) is fixedly installed on the air inlet cover (272).

8. The oxygen concentration regulating device for pyrite roasting according to claim 7, characterized in that: The end of the air intake shroud (272) is detachably fitted with a retaining ring (275), and a filter screen (274) is fixedly installed at the center of the retaining ring (275).

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