Automatic injection device and method for liquid sulfur addition to a low-tin fuming furnace

Abstract

The application discloses an automatic injection device and method for liquid sulfur addition of low-tin fuming furnace sulfurization and volatilization, which comprises a DCS control system and a field device system. The application can accurately adjust and control the liquid sulfur injection amount according to the tin-containing material condition, avoids the waste of sulfur and solves the problem of blockage of traditional pipeline transportation of granular sulfur. The application solves the waste problem of burning of sulfur from the furnace top belt into the molten pool during the traditional belt addition of granular sulfur, and no longer needs to additionally add quartz sand to intervene the excess iron slagging reaction, and solves the manual intervention from the control, realizes one-key operation, and realizes accurate control. The application has high sulfur use efficiency and low cost, and ensures the smoothness and safety of the fuming furnace production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-tin fuming furnace smelting, and more particularly to an automatic injection device and method for liquid sulfur addition and sulfurization volatilization of a low-tin fuming furnace. BACKGROUND

[0002] The fuming furnace blowing mainly recovers valuable metals such as tin from top-blown furnace slag, aluminum slag, and tin middlings by sulfurization volatilization. In the traditional way, the molten top-blown furnace slag is added into the fuming furnace through the hot material adding port, and the electric furnace slag, tin middlings, flux, and sulfur are added into the fuming furnace through the cold material adding port after being proportioned. During the reaction process, sulfur volatilization reagent is added into the furnace according to the smelting condition to realize the processes of slagging, reduction, and sulfurization volatilization. In this way, the granular sulfur is transported by a belt and added into the furnace through the top cold material port. A large amount of sulfur is volatilized and wasted without participating in the reaction due to high temperature during the descent of the sulfur. In addition, sulfur dioxide gas is generated by combustion under high temperature, resulting in low sulfur utilization.

[0003] To solve the above problems, the present application provides an automatic injection device and method for liquid sulfur addition and sulfurization volatilization of a low-tin fuming furnace, which can greatly improve environmental quality, reduce personnel intervention, and improve production efficiency, and also realizes one-key operation and precise control. SUMMARY

[0004] Therefore, the present application aims to provide an automatic injection device and method for liquid sulfur addition and sulfurization volatilization of a low-tin fuming furnace to solve the problem of sulfur waste caused by the traditional belt-type top feeding.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] An automatic injection device for liquid sulfur addition and sulfurization volatilization of a low-tin fuming furnace, characterized in that it comprises a DCS control system and a field device system connected in sequence.

[0007] The DCS control system comprises a configuration server, a controller, a data acquisition module, and an output data module.

[0008] The configuration server is connected to the controller, and the controller is further connected to the data acquisition module and the output data module.

[0009] The field device system comprises a data detection instrument and a field execution mechanism. The data detection instrument is connected to the data acquisition module, and the field execution mechanism is connected to the output data module.

[0010] Preferably, the field execution mechanism comprises:

[0011] Sulfur screening and belt conveying system, sulfur melting holding tank, liquid sulfur conveying pump, liquid sulfur conveying pipeline, central pipeline nitrogen pipe and fuming furnace;

[0012] The sulfur screening and belt conveying system is arranged on one side above the sulfur melting holding tank;

[0013] The liquid sulfur conveying pump is connected with the sulfur melting holding tank and vertically penetrates into the inside of the sulfur melting holding tank;

[0014] The liquid sulfur conveying pump, the liquid sulfur conveying pipeline, the central pipeline nitrogen pipe and the fuming furnace are sequentially connected.

[0015] Preferably, the sulfur screening and belt conveying system comprises:

[0016] The feeding tank, the feeding tank vibrator, the feeding dome valve, the discharging tank, the discharging tank level switch, the discharging tank weighing instrument, the discharging tank vibrator, the granular sulfur conveying belt and the discharging ball valve;

[0017] The feeding tank, the feeding dome valve, the discharging tank and the discharging ball valve are sequentially connected from top to bottom;

[0018] The feeding end of the granular sulfur conveying belt is located at the lower end of the discharging ball valve, and the discharging end is located on one side above the sulfur melting holding tank;

[0019] The feeding tank vibrator is arranged on the side wall of the feeding tank;

[0020] The discharging tank level switch and the discharging tank weighing instrument are both arranged on the side wall of the discharging tank.

[0021] Preferably, the sulfur melting holding tank is provided with a holding tank infrared heater and a discharging hopper;

[0022] The holding tank infrared heater is arranged in the wall around the sulfur melting holding tank; the discharging hopper is arranged on one side above the sulfur melting holding tank; and the discharging end of the granular sulfur conveying belt is arranged above the discharging hopper;

[0023] The outlet end of the liquid sulfur conveying pipeline is in inverted V-shaped structure; the liquid sulfur conveying pipeline is provided with a conveying pipeline infrared heater and a purging nitrogen pipe;

[0024] The conveying pipeline infrared heater is arranged in the pipe wall of the liquid sulfur conveying pipeline;

[0025] The purging nitrogen pipe is arranged at the top of the inverted V-shaped structure of the outlet end of the liquid sulfur conveying pipeline; and a purging valve is arranged on the purging nitrogen pipe;

[0026] The outlet end of the liquid sulfur conveying pipeline is connected with the side wall of the central pipeline nitrogen pipe and penetrates through the side wall;

[0027] The inlet end of the central pipeline nitrogen pipe is provided with a nitrogen injection valve, and the outlet end is provided with an injection gun head; the injection gun head penetrates into the interior of the fuming furnace.

[0028] Preferably, the fuming furnace is provided with a feeding port, an image analyzer, a flue gas analyzer and an automatic sampling device;

[0029] The feeding port is arranged above the side wall of the fuming furnace; the automatic sampling device is arranged at the top of the fuming furnace and penetrates into the interior of the fuming furnace.

[0030] The data detection instrument includes:

[0031] The data detection instrument includes:

[0032] The data detection instrument includes:

[0033] The data detection instrument includes:

[0034] The data detection instrument includes:

[0035] The data detection instrument includes:

[0036] The data detection instrument includes:

[0037] The data detection instrument includes:

[0038] Preferably, the above field execution mechanism further includes: a sample conveying chain machine and a low-tin material conveying belt;

[0039] The data detection instrument includes:

[0040] Preferably, the DCS control system further includes: an industrial Ethernet, a switch, an LBUS bus and an EBUS bus;

[0041] The configuration server is connected with the switch through the industrial Ethernet, and the switch is connected with the controller.

[0042] The switch is connected with the controller through an LBus bus;

[0043] The controller is connected with the data acquisition module and the output data module respectively through an EBus bus.

[0044] In the present application, the DCS control system writes the production process control program into the controller through the configuration server, and the data module is used to monitor the field data in real time, and the data output module is used to control the field equipment. The configuration server displays and monitors the data in real time with the controller through Ethernet and the switch, the controller and the data acquisition module and the data output module are connected through the EBus bus to interact with each other, and the data acquisition module and the data output module interact with the field equipment through the bus.

[0045] In the present application, the control signals of all devices in the field actuator are connected with the output data module.

[0046] Another object of the present application is to provide an automatic injection method for liquid sulfur vulcanization and volatilization of a low-tin fuming furnace, which adopts the above device and comprises the following steps:

[0047] (1) Start the automatic injection device, combine the field data collected by the DCS control system, first judge whether the weight of the granular sulfur in the discharging tank is lower than the set value, and supplement the sulfur;

[0048] According to the weight detection of the discharging tank and the material in the sulfur melting and holding tank, the weight is automatically supplemented when it is lower than the set value of the system;

[0049] (2) After the supplement is completed, the sulfur level in the sulfur melting and holding tank is judged, the granular sulfur conveying belt is started when the level is lower than the set value, the discharging ball valve is opened to supplement the sulfur to the holding and melting tank, the infrared heater of the holding tank is started when the supplement is completed, and the temperature is controlled at the set value of 130-150℃;

[0050] (3) According to the image analyzer, the melting condition in the fuming furnace is judged, if it is completely melted, the nitrogen injection valve and the purging valve are opened, the liquid sulfur conveying pump is started, and the infrared heater of the liquid sulfur conveying pipeline is started, and the liquid sulfur feeding set value starts from 0 and increases by 0.1t / h every 1min;

[0051] According to the temperature detection data of the sulfur melting and holding tank and the liquid sulfur conveying pipeline, when the temperature value is lower than the set temperature, the infrared heater of the holding tank and the infrared heater of the conveying pipeline are started to automatically heat;

[0052] (4) when the set value reaches 90% of the calculated amount, sample the slag sample of the melt in the fuming furnace, and perform analysis, after the slag tin content is less than or equal to 0.2%, stop the liquid sulfur suction pump, and the slag can be discharged; if the slag tin content is higher than 0.2%, take a melt slag sample every 1 min, and then perform analysis, after the slag tin content is less than or equal to 0.2%, stop the liquid sulfur suction pump feeding and spraying, and immediately open the slag port of the fuming furnace to discharge the slag;

[0053] (5) during the liquid sulfur spraying process, the increase or decrease of the sulfur spraying amount is determined according to the detection of the flue gas analyzer, the SO2 and CO concentrations in the flue gas are 0.9-1.5% and 7000-10000 ppm respectively, and the sulfur feeding amount is increased or decreased by less than or equal to ±0.2 t / h to control the SO2 and CO concentrations in the above interval.

[0054] (6) when the liquid sulfur spraying pump is stopped, the nitrogen blowing valve is opened, the blowing time is guaranteed to be 3-5 min, and then the nitrogen blowing valve is closed, the residual sulfur in the liquid sulfur conveying pipeline is returned to the heat preservation tank, the nitrogen spraying valve is always kept open before the liquid sulfur conveying pump is started until the slag is discharged, the nitrogen spraying valve is closed after the slag is discharged, and the whole automatic spraying device enters the next fuming furnace blowing period.

[0055] Preferably, the sampling in step (4) is automatically sampled by an automatic sampling device, the sample is conveyed to a laboratory by a sample conveying chain machine for sample analysis, and the analysis situation is sent to the DCS system through a wireless transmission module.

[0056] According to the technical solution, compared with the prior art, the present application has the following beneficial effects:

[0057] 1. The present application calculates the actual blowing amount of sulfur spraying through the control program written by the configuration server in the DCS control system, realizes automatic tank loading, automatic tank and conveying pipeline heat preservation, automatic sampling, and automatic liquid sulfur feeding, and the whole system realizes centralized monitoring and one-key operation.

[0058] 2. The automatic spraying device of the present application is started according to the melting situation of the material in the fuming furnace. Each execution system performs corresponding according to the set conditions during the starting process. The whole process realizes one-key automatic control, greatly reduces manual intervention, improves production efficiency, and highlights the process control highlights in the global crude tin smelting industry. BRIEF DESCRIPTION OF DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim at the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without any creative effort based on the provided drawings.

[0060] Figure 1 DCS system structure diagram of the automatic spraying device provided by the present application;

[0061] Figure 2 Field device principle diagram of the automatic spraying device provided by the present application;

[0062] Figure 3 Automatic control program logic control diagram of the automatic spraying device provided by the present application.

[0063] Among them, Figure 1 Among them,

[0064] 111-DCS configuration server; 112-industrial Ethernet; 113-switch; 114-LBUS bus; 115-controller; 116-EBUS bus; 117-data acquisition module; 118-output data module; 119-data detection instrument; 120-field actuator;

[0065] Figure 2 Among them,

[0066] 1-feed tank; 2-feed tank shaker; 3-feeding dome valve; 4-discharge tank; 5-discharge tank level switch; 6-discharge tank weighing instrument; 7-discharge tank shaker; 8-particle sulfur conveying belt; 9-insulation tank level detection instrument; 10-insulation tank temperature detection instrument; 11-sulfur melting insulation tank; 12-insulation tank infrared heater; 13-liquid sulfur conveying pump; 14-liquid sulfur conveying pipeline; 15-conveying pipeline infrared heater; 16-sample conveying chain machine; 17-low-tin material conveying belt; 18-purging valve; 19-purging pressure detection instrument; 20-nitrogen injection valve; 21-sulfur feed quantity detection instrument; 22-injection gun head; 23-image analyzer; 24-automatic sampling device; 25-flue gas analyzer; 26-discharge ball valve; 27-fuming furnace; 28-conveying pipeline temperature detection instrument; 29-discharge hopper; 30-central pipeline nitrogen pipe; 31-purging nitrogen pipe; 32-feed inlet. DETAILED DESCRIPTION

[0067] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0068] Embodiment 1

[0069] Referring to Figure 1 and Figure 2 The embodiment provides an automatic injection device for liquid sulfur addition and low-tin fuming furnace sulfurization volatilization, comprising: a DCS control system and a field device system connected in sequence.

[0070] The DCS control system comprises: a configuration server 111, an industrial Ethernet 112, a switch 113, an LBus bus 114, a controller 115, an EBus bus 116, a data acquisition module 117 and an output data module 118.

[0071] The configuration server 11, the industrial Ethernet 112, the switch 113, the LBus bus 114, the controller 115 and the EBus bus 116 are connected in sequence; the data acquisition module 117 and the output data module 118 are connected with the EBus bus 116 respectively.

[0072] The field device system comprises a data detection instrument 119 and a field execution mechanism 120; the data detection instrument 119 is connected with the data acquisition module 117; the field execution mechanism 120 is connected with the output data module 118.

[0073] The field execution mechanism comprises:

[0074] The sulfur screening and belt conveying system, the sulfur melting and heat preservation tank 11, the liquid sulfur conveying pump 13, the liquid sulfur conveying pipeline 14, the central pipeline nitrogen pipe 30, the fuming furnace 27, the sample conveying chain machine 16, the low-tin material conveying belt 17,

[0075] The sulfur screening and belt conveying system is arranged on one side above the sulfur melting and heat preservation tank.

[0076] The liquid sulfur conveying pump 13 is connected with the sulfur melting and heat preservation tank 11 and vertically penetrates into the inside of the sulfur melting and heat preservation tank 11.

[0077] The liquid sulfur conveying pump 13, the liquid sulfur conveying pipeline 14, the central pipeline nitrogen pipe 30 and the fuming furnace 27 are connected in sequence.

[0078] In the embodiment, the sulfur screening and belt conveying system comprises:

[0079] The feeding tank 1, the feeding tank vibrator 2, the feeding dome valve 3, the discharging tank 4, the discharging tank level switch 5, the discharging tank vibrator 7, the granular sulfur conveying belt 8 and the discharging ball valve 26;

[0080] The feeding tank 1, the feeding dome valve 3, the discharging tank 4 and the discharging ball valve 26 are sequentially connected from top to bottom.

[0081] The feeding end of the granular sulfur conveying belt 8 is located at the lower end of the discharging ball valve 26, and the discharging end is located at one side above the sulfur melting holding tank 11.

[0082] The feeding tank vibrator 2 is arranged on the side wall of the feeding tank 1.

[0083] The discharging tank level switch 5 is arranged on the side wall of the discharging tank 4.

[0084] The sulfur melting holding tank 11 is provided with a holding tank infrared heater 12 and a discharging hopper 29.

[0085] The holding tank infrared heater 12 is arranged in the wall around the sulfur melting holding tank 11; the discharging hopper 29 is arranged at one side above the sulfur melting holding tank 11; and the discharging end of the granular sulfur conveying belt 8 is arranged above the discharging hopper 29.

[0086] The outlet end of the liquid sulfur conveying pipeline 14 is in a inverted V-shaped structure; the liquid sulfur conveying pipeline 14 is provided with a conveying pipeline infrared heater 15 and a purging nitrogen pipe 31.

[0087] The conveying pipeline infrared heater 15 is arranged in the pipe wall of the liquid sulfur conveying pipeline 14.

[0088] The purging nitrogen pipe 31 is arranged at the top of the inverted V-shaped structure of the outlet end of the liquid sulfur conveying pipeline 14; and the purging nitrogen pipe 31 is provided with a purging valve 18.

[0089] The outlet end of the liquid sulfur conveying pipeline 14 is connected with and penetrates through the side wall of the center pipeline nitrogen pipe 30.

[0090] The inlet end of the center pipeline nitrogen pipe 30 is provided with a nitrogen injection valve 20, and the outlet end is provided with an injection gun head 22; the injection gun head 22 penetrates into the interior of the fuming furnace 27.

[0091] The fuming furnace is provided with a feeding port 32 and an automatic sampling device 24.

[0092] The feeding port 32 is arranged above the side wall of the fuming furnace 27; and the automatic sampling device 24 is arranged at the top of the fuming furnace 27 and penetrates into the interior of the fuming furnace 27.

[0093] The low-tin material conveying belt 17 is arranged on one side above the feed inlet 32; the sample conveying chain machine 16 is arranged on one side at the top of the automatic sampling device 24;

[0094] The data detection instrument includes: a discharging tank weighing instrument 6, a heat preservation tank temperature detection instrument 10, a heat preservation tank level detection instrument 9, a conveying pipeline temperature detection instrument 28, a purge pressure detection instrument 19, a sulfur feed quantity detection instrument 21, an image analysis instrument 23, and a flue gas analysis instrument 25;

[0095] The discharging tank weighing instrument 6 is arranged on the side wall of the discharging tank 4;

[0096] The heat preservation tank temperature detection instrument 10 and the heat preservation tank level detection instrument 9 are both arranged above the sulfur melting heat preservation tank 11 and penetrate into the interior of the sulfur melting heat preservation tank 11;

[0097] The conveying pipeline temperature detection instrument 28 is arranged on the side wall of the liquid sulfur conveying pipeline 14;

[0098] The purge pressure detection instrument 19 is arranged at the inlet end of the purge nitrogen pipe 31;

[0099] The sulfur feed quantity detection instrument 21 is arranged on one side of the center pipeline nitrogen pipe 30 close to the outlet end;

[0100] The image analysis instrument 23 is arranged at the top of the fuming furnace 27; the flue gas analysis instrument 25 is arranged on the flue gas pipeline of the fuming furnace 27;

[0101] In this embodiment, the control signals of all devices in the field execution mechanism are connected with the output data module 118.

[0102] Embodiment 2

[0103] The embodiment provides an automatic injection method for low-tin fuming furnace liquid sulfur vulcanization volatilization, which comprises the following steps:

[0104] (1) Through the feeding condition, one-key start of the automatic injection system, combined with the field data collected by the DCS control system, first judge whether the weight of the granular sulfur in the discharging tank 4 is lower than the set value, and supplement the sulfur;

[0105] (2) After the supplement is completed, the sulfur level in the sulfur melting heat preservation tank 11 is judged by the discharging tank weighing instrument 6, the granular sulfur conveying belt 8 is started when the level is lower than the set value, and the discharging ball valve 26 is opened to supplement the sulfur to the heat preservation melting tank, the heat preservation tank infrared heater 12 is started after the supplement is completed, and the temperature is controlled at the set value of 130-150℃;

[0106] (3) According to the image analyzer 23 to determine the smelting condition in the smoke furnace 27, if completely melted, open nitrogen injection valve 20, purge valve 18, start liquid sulfur delivery pump 13, at the same time start the delivery pipeline infrared heater 15, liquid sulfur feeding set value from 0 start to increase 0.1 t / h every 1 min mode feeding set;

[0107] (4) When the set value reaches 90% of the calculated amount, sample the smelting slag sample in the smoke furnace, and perform chemical analysis. After the slag contains tin ≤0.2%, stop the liquid sulfur suction pump, and the slag can be discharged. If the slag contains tin higher than 0.2%, take a smelting slag sample every 1 min, then perform chemical analysis, and after the slag contains tin ≤0.2%, stop the liquid sulfur suction pump feeding injection, immediately open the smoke furnace slag port to discharge the slag. During the liquid sulfur injection process, the increase or decrease of the sulfur injection amount is determined according to the detection of the smoke analyzer. The concentrations of SO2 and CO in the smoke are 0.9-1.5% and 7000-10000 ppm respectively. If they are lower or higher than the interval values, the sulfur feeding amount is increased or decreased respectively, and the adjustment is within ±0.2 t / h to control the SO2 and CO concentrations within the above interval values;

[0108] (5) When the liquid sulfur injection pump 13 stops, open the nitrogen purge valve 18, and the purge time is guaranteed to be 3-5 minutes before closing, to ensure that the residual sulfur in the liquid sulfur delivery pipeline 14 flows back to the holding tank;

[0109] (6) Before the liquid sulfur delivery pump 13 starts until the end of slag discharge, the nitrogen injection valve 20 is always kept open to prevent the sulfur injection lance 16 from being blocked by slag. After the slag discharge is completed, the nitrogen injection valve 20 is closed. The entire automatic injection system enters the next smoke furnace blowing period.

[0110] Comparative Example 1

[0111] The DCS control system is still used, and the field device system cancels the sulfur melting holding tank, the liquid sulfur delivery pump, and the liquid sulfur delivery pipeline. The sulfur feeding is directly added by the top belt type. During the feeding process, the granular sulfur is wasted due to volatilization at high temperature. At the same time, the granular sulfur is easily combusted above 248°C to directly generate sulfur dioxide, which seriously affects the effective utilization rate of granular sulfur and the smelting effect of the smoke furnace.

[0112] Comparative Example 2

[0113] The DCS control system is still used, and the field device system remains unchanged. Only the automatic injection is changed to manual injection. During the actual operation process, there are many field actuators, which greatly increases the workload of the operators. At the same time, the operators are prone to misoperation, which increases the workload of the maintenance personnel, greatly shortens the service life of the equipment, and seriously affects the production efficiency.

[0114] 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.

[0115] 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. A low-tin fuming furnace liquid sulfur injection device for automatic injection of liquid sulfur for fuming and vulcanization, characterized in that, Comprising: comprising a DCS control system and a field device system connected in sequence; wherein the DCS control system comprises a configuration server, a controller, a data acquisition module and an output data module; the configuration server is connected with the controller; the controller is further connected with the data acquisition module and the output data module respectively; the field device system comprises a data detection instrument and a field execution mechanism; the data detection instrument is connected with the data acquisition module; the field execution mechanism is connected with the output data module; the field execution mechanism comprises: a sulfur screening and belt conveying system, a sulfur melting and heat preservation tank, a liquid sulfur conveying pump, a liquid sulfur conveying pipeline, a central pipeline nitrogen pipe and a fuming furnace; the sulfur screening and belt conveying system is arranged on one side above the sulfur melting and heat preservation tank; the liquid sulfur conveying pump is connected with the sulfur melting and heat preservation tank and vertically penetrates to the inside of the sulfur melting and heat preservation tank; the liquid sulfur conveying pump, the liquid sulfur conveying pipeline, the central pipeline nitrogen pipe and the fuming furnace are connected in sequence; the outlet end of the liquid sulfur conveying pipeline is connected with the side wall of the central pipeline nitrogen pipe and penetrates through; the inlet end of the central pipeline nitrogen pipe is provided with a nitrogen injection valve, and the outlet end is provided with an injection gun head; the injection gun head penetrates to the inside of the fuming furnace.

2. An automatic injection device for liquid sulfur injection for low tin fuming furnaces according to claim 1, characterized in that, the sulfur screening and belt conveying system comprises: a feed tank, a feed tank vibrator, a feeding dome valve, a discharging tank, a discharging tank level switch, a discharging tank vibrator, a granular sulfur conveying belt and a discharging ball valve; wherein the feed tank, the feeding dome valve, the discharging tank and the discharging ball valve are connected in sequence from top to bottom; the feeding end of the granular sulfur conveying belt is located at the lower end of the discharging ball valve, and the discharging end is located on one side above the sulfur melting and heat preservation tank; the feed tank vibrator is arranged on the side wall of the feed tank; the discharging tank level switch is arranged on the side wall of the discharging tank.

3. An automatic injection device for liquid sulfur injection for low tin fuming furnaces according to claim 2, characterized in that, the sulfur melting and heat preservation tank is provided with a heat preservation tank infrared heater and a discharging hopper; wherein the heat preservation tank infrared heater is arranged in the wall around the sulfur melting and heat preservation tank; the discharging hopper is arranged on one side above the sulfur melting and heat preservation tank; the discharging end of the granular sulfur conveying belt is arranged above the discharging hopper; the outlet end of the liquid sulfur conveying pipeline is in inverted V-shaped structure; the liquid sulfur conveying pipeline is provided with a conveying pipeline infrared heater and a purging nitrogen pipe; the conveying pipeline infrared heater is arranged in the pipe wall of the liquid sulfur conveying pipeline; the purging nitrogen pipe is arranged at the top of the inverted V-shaped structure of the outlet end of the liquid sulfur conveying pipeline; a purging valve is arranged on the purging nitrogen pipe.

4. An automatic injection device for low-tin fuming furnace liquid sulphur addition sulphidation volatilization according to claim 3, characterized in that, the fuming furnace is provided with a feeding port and an automatic sampling device; the feeding port is arranged above the side wall of the fuming furnace; the automatic sampling device is arranged at the top of the fuming furnace and penetrates to the inside of the fuming furnace.

5. An automatic injection device for low-tin fuming furnace liquid sulphur addition sulphidation volatilization according to claim 4, characterized in that, the data detection instrument comprises: a discharging tank weighing instrument, a heat preservation tank temperature detection instrument, a heat preservation tank level detection instrument, a conveying pipeline temperature detection instrument, a purging pressure detection instrument, a sulfur feeding amount detection instrument, an image analysis instrument and a flue gas analysis instrument; The downcomer tank weighing instrument is arranged on the side wall of the downcomer tank; The temperature detector of the heat preservation tank and the heat preservation tank level detector are arranged above the sulfur melting heat preservation tank and penetrate into the interior of the sulfur melting heat preservation tank; The conveying pipeline temperature detector is arranged on the side wall of the liquid sulfur conveying pipeline; The purge pressure detector is arranged at the inlet end of the purge nitrogen pipe; The sulfur feeding amount detector is arranged on one side of the central pipeline nitrogen pipe close to the outlet end; The image analyzer is arranged on the top of the fuming furnace; and the flue gas analyzer is arranged on the flue gas pipeline of the fuming furnace.

6. An automatic injection device for low-tin fuming furnace liquid sulphur addition sulphidation volatilization according to claim 5, characterized in that, The on-site execution mechanism further comprises a sample conveying chain machine and a low-tin material conveying belt; The low-tin material conveying belt is arranged on one side above the feeding port; and the sample conveying chain machine is arranged on one side above the automatic sampling device.

7. An automatic injection device for low-tin fuming furnace liquid sulphur addition sulphidation volatilization according to claim 6, characterized in that, The DCS control system further comprises an industrial Ethernet, a switch, an LBUS bus and an LBUS bus; The configuration server is connected with the switch through the industrial Ethernet; and the switch is connected with the controller; The switch is connected with the controller through the LBUS bus; The controller is connected with the data acquisition module and the output data module through the EBUS bus respectively.

8. A method of automatically injecting liquid sulfur into a low-tin fuming furnace to vulcanize volatilization, characterized by, The device of claim 7 comprises the following steps: (1) Start the automatic injection device, combine the on-site data collected by the DCS control system, first determine whether the weight of the granular sulfur in the downcomer tank is lower than the set value, and supplement the sulfur; (2) After the supplement is completed, determine the sulfur level in the sulfur melting heat preservation tank, if the level is lower than the set value, start the granular sulfur conveying belt, at the same time, open the downcomer ball valve to supplement the sulfur in the heat preservation melting tank, after the supplement is completed, start the heat preservation tank infrared heater, and control the temperature at the set value of 130-150℃; (3) According to the image analyzer, determine the melting condition of the low-tin material in the fuming furnace, if the low-tin material is completely melted, open the nitrogen injection valve and the purge valve, start the liquid sulfur conveying pump, at the same time, start the liquid sulfur conveying pipeline infrared heater, and set the liquid sulfur feeding value from 0, increase by 0.1t / h every 1min; (4) When the set value reaches 90% of the calculated amount, sample the slag in the fuming furnace, and perform chemical analysis, after the slag contains tin ≤0.2%, stop the liquid sulfur suction pump, and the slag can be discharged; if the slag contains tin higher than 0.2%, take a slag sample every 1min, then perform chemical analysis, after the slag contains tin ≤0.2%, stop the liquid sulfur suction pump, and immediately open the fuming furnace slag port to discharge the slag; (5) During the liquid sulfur injection process, according to the detection condition of the flue gas analyzer, determine the increase or decrease of the sulfur injection amount, when the SO2 and CO concentrations in the flue gas are respectively 0.9-1.5% and 7000-10000ppm, lower or higher than the interval, respectively increase or decrease the sulfur feeding amount, and all within ±0.2t / h to control the SO2 and CO concentrations within the above interval. (6) Liquid sulfur injection pump stopped at the same time, open nitrogen purge valve, purge time guarantee in 3~5 min after closing, ensure that the residual sulfur in liquid sulfur conveying pipeline backflow to the heat preservation tank, until the end of the slag discharge before the start of the liquid sulfur conveying pump, nitrogen injection valve always keep open state, prevent the sulfur spray gun was blocked by slag, slag discharge closed nitrogen injection valve, the whole automatic injection device into the next smoke furnace blowing cycle.

9. An automatic injection method for low-tin fuming furnace liquid sulfur addition sulfurization volatilization according to claim 8, characterized in that, The sampling in step (4) is: automatic sampling by automatic sampling device, and sample is transmitted to the laboratory for sample analysis by sample conveying chain machine, and the analysis condition is sent to the DCS control system through the wireless transmission module.

Images