Automatic injection device and method for granular sulfur sulfurization and volatilization of low-tin fuming furnace

Abstract

The application discloses an automatic injection device and method for granular sulfur sulfurization and volatilization of a low-tin fuming furnace, and the automatic injection system comprises a DCS management layer, a DCS control layer and a field device layer. The application sets the granular sulfur input amount according to actual feeding parameters, and calculates the actual injection amount according to the weighing detection parameters, so as to ensure that the granular sulfur and the materials in the fuming furnace completely react to achieve the sulfurization and volatilization purpose. The application solves the problems of low sulfur utilization rate caused by volatilization or oxidation of sulfur falling at high temperature during the traditional top belt type sulfur feeding process of the fuming furnace, and solves the manual intervention in the control, realizes one-key operation, improves the production efficiency, and achieves the purpose of energy saving and consumption reduction.

Description

Technical Field

[0001] This invention relates to the field of low-tin fuming furnace smelting technology, and more specifically to an automatic injection device and method for volatilization of particulate sulfur in a low-tin fuming furnace. Background Technology

[0002] Fume smelting primarily utilizes the sulfide volatilization method to recover valuable metals such as tin from top-blown furnace slag, electric arc furnace smelting slag, tin secondary concentrate, and tin middlings. Traditionally, molten top-blown furnace slag is added to the fume smelting furnace through the hot feed inlet. Electric arc furnace slag, tin secondary concentrate, tin middlings, flux, and sulfur are then added to the furnace through the cold feed inlet to react, achieving slag formation, reduction, and sulfide volatilization. However, this method suffers from significant sulfur waste due to high temperatures encountered during sulfur descent, resulting in unreacted sulfur volatilization. Furthermore, the combustion at high temperatures produces sulfur dioxide gas, leading to low sulfur utilization.

[0003] To address the above problems, this invention proposes an automatic injection device and method for the volatilization of low-tin fuming furnaces with granular sulfur. This not only significantly improves environmental quality, reduces human intervention, and increases production efficiency, but also achieves one-button operation control. Therefore, this invention provides an automatic injection device and method for the volatilization of low-tin fuming furnaces with granular sulfur, solving the problem of sulfur waste and maximizing cost savings for the company. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic injection device and method for the volatilization of particulate sulfur in a low-tin fuming furnace, thereby solving the problem of sulfur waste caused by traditional belt-type top feeding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic injection device for volatilization of low-tin fuming furnace with particulate sulfur includes a DCS management layer, a DCS control layer and a field equipment layer connected in sequence.

[0007] The DCS management layer includes an engineer workstation and a DCS configuration server.

[0008] The DCS control layer includes a DCS controller, a data acquisition module, and an output data module; the engineering workstation and the DCS configuration server are both connected to the DCS controller; the DCS controller is also connected to the data acquisition module and the output data module respectively.

[0009] The field equipment layer includes data detection instruments and field actuators; the data detection instruments are connected to the data acquisition module; and the field actuators are connected to the output data module.

[0010] Preferably, the data detection instrument includes:

[0011] Weighing instruments, nitrogen pressure detectors, nitrogen flow detectors, injection pressure detectors, image analyzers, and flue gas analyzers;

[0012] The field execution agencies include:

[0013] Feed tank, injection tank, dome valve, rotary feeder, rotary exhaust valve, nitrogen vulcanization valve, injection valve, nitrogen conveying valve, pressurizing valve, sulfur loading valve, electric ball valve for material discharge, sulfur spray gun, fuming furnace and material level switch;

[0014] The feed tank, dome valve, jet can and rotary feeder are connected in sequence from top to bottom;

[0015] One side of the top of the injection tank is connected to the rotary exhaust valve, and the other side is sequentially connected to the pressurization valve, the nitrogen flow detector, and the nitrogen delivery valve.

[0016] The nitrogen pressure detector and the nitrogen sulfidation valve are respectively connected to the pipeline between the injection tank and the rotary exhaust valve, wherein the nitrogen pressure detector is closer to the injection tank and the nitrogen sulfidation valve is closer to the rotary exhaust valve.

[0017] One end of the injection valve is connected to the pipeline between the nitrogen flow meter and the pressurization valve, and the other end is connected to the rotary feeder;

[0018] One end of the sulfur-carrying valve is connected to the pipeline between the nitrogen flow detector and the pressurizing valve, and the other end is connected to the injection pressure detector and the sulfur spray gun in sequence.

[0019] One end of the electric ball valve is connected to the rotary feeder, and the other end is connected to the pipeline between the sulfur-carrying valve and the injection pressure detector.

[0020] The sulfur spray gun extends to the bottom of the fuming furnace; the image analyzer and the flue gas analyzer are both located at the top of the fuming furnace and connected to it.

[0021] The material level switch is located on the side wall of the injection tank;

[0022] The weighing and detection instrument is installed on both sides of the blow tank.

[0023] Preferably, the above-mentioned device further includes: an industrial Ethernet network and a switch;

[0024] The engineering workstation and the DCS configuration server are connected to the switch via industrial Ethernet, and the switch is connected to the DCS controller.

[0025] Preferably, the above-mentioned device further includes:

[0026] The switch is connected to the DCS controller via an LBUS bus.

[0027] The DCS controller is connected to the data acquisition module and the output data module via the EBUS bus.

[0028] In this invention, the control signals of all devices in the field actuator are connected to the output data module.

[0029] Another object of the present invention is to provide an automatic injection method for volatilization of particulate sulfur in a low-tin fuming furnace, using the above-mentioned apparatus, comprising:

[0030] (1) Start the device, and based on the field data collected by the DCS control layer, first determine whether the weight of sulfur in the injection tank is lower than the set value, and then replenish the sulfur.

[0031] (2) After the replenishment is completed, the melting situation in the fuming furnace is judged by the image analyzer. If it is completely melted, the sulfur-carrying valve and nitrogen conveying valve are opened, the rotary feeder is started, and the electric ball valve for feeding is opened. When the injection pressure is greater than 1.0 kPa and the rotary feeder speed is greater than 2 r / min, the injection valve and pressurizing valve are opened. At the same time, the theoretical sulfur injection value is set to 90% of the calculated value.

[0032] (3) During the blowing process, it is determined whether the tin content in the slag is greater than 0.2% during the feeding process, and the sulfur is increased or decreased according to the detection of the flue gas analyzer. The SO2 and CO concentrations in the flue gas are controlled at 0.9-1.5% and 7000-10000ppm respectively. If the concentrations are lower or higher than the range, the sulfur feed rate is increased or decreased respectively. The SO2 and CO concentrations are controlled within the above range by making slight adjustments within ±0.2t / h.

[0033] (4) When the tin content in the slag is less than 0.2%, stop the sulfur injection. The nitrogen delivery valve and the sulfur-carrying valve remain open until the slag discharge is completed to prevent the spray gun and injection pipeline from getting blocked. At the same time, the control program enters the next blowing cycle.

[0034] Preferably, in the above-mentioned device, the actual sulfur injection volume is calculated by the control program written by the engineer station and DCS configuration server, and the rotation speed of the rotary feeder is adjusted by PID according to the actual required value.

[0035] Preferably, the actual sulfur injection rate is obtained by multiplying the weight reduction of the injection tank per second by 3600 seconds to obtain the actual instantaneous injection value.

[0036] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0037] The automatic injection system of this invention selects the start-up of the automatic injection system according to the smelting conditions of the material in the fuming furnace. During the start-up process, each execution system responds according to the set conditions. The whole process realizes one-click automatic control, which greatly reduces manual intervention and improves production efficiency, highlighting the process control highlights in the global crude tin smelting industry. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 A structural diagram of the automatic blowing device for volatilization of low-tin fuming furnace with granular sulfur provided by the present invention;

[0040] Figure 2 A structural diagram of the field actuator in the automatic injection device for volatilization of low-tin fuming furnace with granular sulfur provided by the present invention;

[0041] Figure 3 The automatic control program logic diagram of the automatic blowing device for volatilization of low-tin fuming furnace with granular sulfur provided by the present invention.

[0042] in, Figure 1 middle:

[0043] 111-Engineer Station; 112-DCS Configuration Server; 113-Industrial Ethernet; 114-Switch; 115-LBUS Bus; 116-DCS Controller; 117-EBUS Bus; 118-Data Acquisition Module; 119-Output Data Module; 120-Field Data Detection Instrument; 121-Field Actuator;

[0044] Figure 2 middle:

[0045] 1-Feed tank; 2-Dome valve; 3-Purge tank; 4-Rotary feeder; 5-Weighing instrument; 6-Rotary exhaust valve; 7-Nitrogen sulfurization valve; 8-Nitrogen pressure detector; 9-Purge valve; 10-Nitrogen delivery valve; 11-Nitrogen flow meter; 12-Pressure valve; 13-Sulfur loading valve; 14-Purge pressure detector; 15-Discharge electric ball valve; 16-Sulfur spray gun; 17-Fumigation furnace; 18-Image analyzer; 19-Flue gas analyzer; 20-Material level switch. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Example 1

[0048] This embodiment provides an automatic spraying device for volatilization of low-tin fuming furnace with particulate sulfur, including a DCS management layer, a DCS control layer and a field equipment layer connected in sequence;

[0049] The DCS management layer includes engineer station 111 and DCS configuration server 112.

[0050] The DCS control layer includes a DCS controller 116, a data acquisition module 118, and an output data module 119; the engineer station 111 and the DCS configuration server 112 are both connected to the DCS controller 116; the DCS controller 116 is also connected to the data acquisition module 118 and the output data module 119 respectively.

[0051] The field equipment layer includes a data detection instrument 120 and a field actuator 21; the data detection instrument 120 is connected to the data acquisition module 118; and the field actuator 121 is connected to the output data module 119.

[0052] The on-site data detection instruments include:

[0053] Weighing instrument 5, nitrogen pressure instrument 8, nitrogen flow meter 11, injection pressure instrument 14, image analyzer 18, and flue gas analyzer 19;

[0054] The on-site implementing agencies include:

[0055] 1. Feed tank; 2. Dome valve; 3. Pulsating tank; 4. Rotary feeder; 6. Rotary exhaust valve; 7. Nitrogen sulfurization valve; 9. Pulsating valve; 10. Nitrogen conveying valve; 12. Pressurizing valve; 13. Sulfur loading valve; 15. Electric ball valve for material discharge; 16. Sulfur spray gun; 17. Fuming furnace; and 20. Material level switch.

[0056] Among them, the feed tank 1, dome valve 2, spray tank 3 and rotary feeder 4 are connected in sequence from top to bottom;

[0057] One side of the top of the injection tank 3 is connected to the rotary exhaust valve 6, and the other side is sequentially connected to the pressure valve 12, the nitrogen flow detector 11, and the nitrogen delivery valve 10.

[0058] Nitrogen pressure detector 8 and nitrogen sulfidation valve 7 are both connected to the pipeline between injection tank 3 and rotary exhaust valve 6, with nitrogen pressure detector 8 closer to injection tank 3 and nitrogen sulfidation valve 7 closer to rotary exhaust valve 6.

[0059] One end of the jet valve 9 is connected to the pipeline between the nitrogen flow meter 11 and the pressure valve 12, and the other end is connected to the rotary feeder 4.

[0060] One end of the sulfur-carrying valve 13 is connected to the pipeline between the nitrogen flow detector 11 and the pressurizing valve 12, and the other end is connected to the injection pressure detector 14 and the sulfur spray gun 16 in sequence.

[0061] One end of the electric ball valve 15 is connected to the rotary feeder 4, and the other end is connected to the pipeline between the sulfur-carrying valve 13 and the injection pressure detector 14;

[0062] The sulfur spray gun 16 extends to the bottom of the fuming furnace 17; the top of the fuming furnace 17 is connected to an image analyzer 18 and a flue gas analyzer 19.

[0063] The material level switch 20 is installed on the side wall of the injection tank 3;

[0064] Weighing and measuring instruments 5 are installed on both sides of the blow tank 3;

[0065] In this embodiment, the device further includes: an industrial Ethernet 113 and a switch 114;

[0066] The engineer station 111 and the DCS configuration server 112 are connected to the switch 114 via the industrial Ethernet 113, and the switch 114 is connected to the DCS controller 116.

[0067] In this embodiment, an LBUS bus 115 is connected between the switch 114 and the DCS controller 116;

[0068] DCS controller 116 is connected to data acquisition module 118 and output data module 119 via EBUS bus 117.

[0069] In this embodiment, the control signals of all devices in the field actuator are connected to the output data module 119.

[0070] Example 2

[0071] This embodiment provides an automatic injection method for volatilization of particulate sulfur in a low-tin fuming furnace, including:

[0072] Based on the feeding situation, the injection system is started with one key. Combining this with field data collected from the control layer, the system first checks if the sulfur weight in injection tank 3 is below the set value and replenishes the sulfur accordingly. After replenishment, the image analyzer 18 checks the smelting status in the fuming furnace 17. If it is completely melted, the sulfur-carrying valve 13 and nitrogen delivery valve 10 are opened, the rotary feeder 4 is started, and the electric ball valve for discharging is opened. When the injection pressure is greater than 1.0 kPa and the rotary feeder 4 speed is greater than 2 r / min, the injection valve 9 and pressure valve 12 are opened. Simultaneously, the sulfur injection value is set to 90% of the calculated value. During the blowing process, the tin content in the slag is checked during feeding to determine if it is greater than 0.2%, and the results are also determined based on the flue gas analyzer 19. Whether to increase or decrease sulfur, control the SO2 and CO concentrations in the flue gas to 0.9-1.5% and 7000-10000ppm respectively. If the concentrations are lower or higher than these ranges, the sulfur feed rate will be increased or decreased accordingly, with fine adjustments within ±0.2t / h to control the SO2 and CO concentrations within the above ranges. When the tin content in the slag is less than 0.2%, stop sulfur injection. The nitrogen delivery valve 10 and the sulfur-carrying valve 13 will remain open until the slag discharge is completed to prevent the spray gun 16 and the injection pipeline from becoming blocked. At the same time, the control program will enter the next blowing cycle.

[0073] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic injection device for volatilization of particulate sulfur in a low-tin fuming furnace, characterized in that, This includes the DCS management layer, DCS control layer, and field device layer, connected in sequence, as well as industrial Ethernet and switches; The DCS management layer includes an engineering workstation and a DCS configuration server; the DCS control layer includes a DCS controller, a data acquisition module, and an output data module; both the engineering workstation and the DCS configuration server are connected to the DCS controller; the DCS controller is also connected to the data acquisition module and the output data module respectively. The field device layer includes data detection instruments and field actuators; the data detection instruments are connected to the data acquisition module; the field actuators are connected to the output data module; the engineering station and the DCS configuration server are connected to the switch via industrial Ethernet, and the switch is connected to the DCS controller; an LBUS bus connects the switch and the DCS controller; the DCS controller is connected to the data acquisition module and the output data module via an EBUS bus. The data detection instruments include: a weighing instrument, a nitrogen pressure instrument, a nitrogen flow meter, a jet pressure instrument, an image analyzer, and a flue gas analyzer; The field actuators include: feed tank, injection tank, dome valve, rotary feeder, rotary exhaust valve, nitrogen sulfidation valve, injection valve, nitrogen conveying valve, pressurization valve, sulfur loading valve, discharge electric ball valve, sulfur spray gun, fuming furnace, and material level switch; The feed tank, dome valve, jet can and rotary feeder are connected in sequence from top to bottom; One side of the top of the injection tank is connected to the rotary exhaust valve, and the other side is sequentially connected to the pressurization valve, the nitrogen flow detector, and the nitrogen delivery valve. The nitrogen pressure detector and the nitrogen sulfidation valve are both connected to the pipeline between the injection tank and the rotary exhaust valve, wherein the nitrogen pressure detector is closer to the injection tank and the nitrogen sulfidation valve is closer to the rotary exhaust valve. One end of the injection valve is connected to the pipeline between the nitrogen flow meter and the pressurization valve, and the other end is connected to the rotary feeder; One end of the sulfur-carrying valve is connected to the pipeline between the nitrogen flow detector and the pressurizing valve, and the other end is connected to the injection pressure detector and the sulfur spray gun in sequence. One end of the electric ball valve is connected to the rotary feeder, and the other end is connected to the pipeline between the sulfur-carrying valve and the injection pressure detector. The sulfur spray gun extends to the bottom of the fuming furnace; the image analyzer and the flue gas analyzer are both located at the top of the fuming furnace and connected to it. The material level switch is located on the side wall of the injection tank; The weighing and detection instrument is installed on both sides of the blow tank.

2. An automatic injection method for volatilization of particulate sulfur in a low-tin fuming furnace, characterized in that, The apparatus of claim 1 comprises: (1) Start the device, and based on the field data collected by the DCS control layer, first determine whether the weight of sulfur in the injection tank is lower than the set value, and then replenish the sulfur. (2) After the replenishment is completed, the melting situation in the fuming furnace is judged by the image analyzer. If it is completely melted, the sulfur-carrying valve and nitrogen conveying valve are opened, the rotary feeder is started, and the electric ball valve for feeding is opened. When the injection pressure is greater than 1.0 kPa and the rotary feeder speed is greater than 2 r / min, the injection valve and pressurizing valve are opened. At the same time, the theoretical sulfur injection value is set to 90% of the calculated value. (3) During the blowing process, it is determined whether the tin content in the slag is greater than 0.2% during the feeding process, and it is determined whether to increase or decrease the amount of sulfur based on the detection of the flue gas analyzer. The concentrations of SO2 and CO in the flue gas are controlled at 0.9~1.5% and 7000~10000ppm respectively. If the concentrations are lower or higher than the range, the amount of sulfur feed is increased or decreased respectively. The adjustment is within ±0.2t / h to control the concentrations of SO2 and CO within the above range. (4) When the tin content in the slag is less than 0.2%, stop the sulfur injection, and keep the nitrogen delivery valve and sulfur-carrying valve open until the slag discharge is finished.

3. The automatic injection method for volatilization of particulate sulfur in a low-tin fuming furnace according to claim 2, characterized in that, In the device, the actual sulfur injection volume is calculated by the control program written on the engineering workstation and DCS configuration server, and the rotation speed of the rotary feeder is adjusted by PID according to the actual required value.

4. The automatic injection method for volatilization of particulate sulfur in a low-tin fuming furnace according to claim 2, characterized in that, The actual sulfur injection rate is calculated by multiplying the weight reduction of the injection tank per second by 3600 seconds to obtain the actual instantaneous injection value.

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