Automatic pneumatic conveying system for zinc oxide smoke dust of fuming furnace

Abstract

The invention belongs to the technical field of zinc hydrometallurgy, and particularly relates to a fuming furnace zinc oxide smoke dust automatic pneumatic conveying system which comprises a control unit, a material level monitoring unit, a feeding unit, a conveying unit, an anti-blocking unit, a vibration unit, a switching unit, an A-column automatic smoke dust discharging valve and a B-column automatic smoke dust discharging valve and is used for achieving automatic switching of double-column conveying. Through the synergistic effect of the double-material-level automatic control system and the pneumatic dome sealing feeding valve, full-process automation of zinc oxide smoke dust from detection to conveying is achieved, the manual intervention requirement is greatly reduced, the problems of leakage, poor environment and high failure rate of oxidation smoke dust materials in a mechanical conveying mode are effectively solved, and the production efficiency is improved. And reliable and stable operation of the system is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrometallurgy zinc smelting, and in particular relates to an automatic pneumatic conveying system for zinc oxide smoke in a fuming furnace. Background Art

[0002] Zinc oxide in the fuming furnace has strong viscosity, is easy to clog and self-ignite, has complex composition, high sulfur content, is easy to self-ignite and has high viscosity. The ultra-fine dust particle size of the smoke is 2-15umm, and the particle size of 200 mesh and below accounts for 98%. Therefore, zinc oxide in the production process of the fuming furnace is mostly transported mechanically or in packages. The accident rate is high, and dust leakage is easy to cause secondary pollution, power consumption is high, and it is difficult to achieve automated transportation, which seriously affects production costs, working environment and corporate image. In production practice, the amount of work and maintenance is large, and frequent processing is required to ensure normal production operation, which directly affects production costs and working environment. Summary of the Invention

[0003] The object of the present invention is to provide an automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace to solve the problems raised in the above background technology.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: An automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace, comprising: A control unit, comprising a control box and a delivery pipeline transmitter, wherein the control box is used to receive signals and control system operation, and the delivery pipeline transmitter is used to monitor the state of the delivery pipeline; The material level monitoring unit includes a high-resistance rotary material level sensor and a low material level sensor, which are used to detect the high material level and the low material level of the material in the ash bin respectively, and transmit the signal to the control box; The feeding unit includes a pneumatic dome-sealed feeding valve and a homogenizing tube group. The pneumatic dome-sealed feeding valve is opened and closed under the command of the control box, and the homogenizing tube group is used to finely crush the material; The conveying unit, including the main blowing device and the silo pump, is used to convey the zinc oxide smoke dust to the pressure relief box on the top of the ash silo through the pipeline; Anti-blocking unit, including accidental blockage removal pipe group, is used to automatically identify and clear pipeline blockage; A vibration unit, including an electric vibrator, is used to prevent smoke and dust from sticking to the silo wall; The switching unit includes automatic smoke and dust discharge valves for column A and column B, which are used to realize automatic switching of double-column conveying.

[0005] The working process of the feeding unit is: When the high-resistance rotary level sensor detects a high material level, the control box activates the pneumatic dome-sealed feed valve to close the feed; When the low material level sensor detects a low material level, the control box starts the homogenizing pipe group to crush the material for 40 seconds, and then starts the main blowing device and silo pump for transportation.

[0006] The anti-blocking unit monitors the pipeline pressure or flow parameters in real time, and the control box automatically triggers the blockage removal operation.

[0007] The vibration unit is started at preset time intervals during the feeding process, and the vibration frequency is adjustable.

[0008] The discharge valves of column A and column B of the switching unit are linked via the signal of the conveying pipeline transmitter. When the conveying of column A is completed, the control box closes the discharge valve of column A and opens the discharge valve of column B.

[0009] The pneumatic dome-sealed feed valve adopts a graphite packing sealing chamber and a flange gland cavity structure, and the sealing pressure is ≥0.6MPa.

[0010] The conveying distance of the system is 356 meters, the conveying capacity is ≥25 tons / day, and the integrity rate of the silo pump is ≥95%.

[0011] The system also includes a top manual shut-off valve for manually isolating materials during emergency shut-off or maintenance.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1) Through the synergistic effect of the dual-level automatic control system and the pneumatic dome-sealed feed valve, this invention automates the entire process from detection to transportation of zinc oxide dust, significantly reducing the need for manual intervention. This effectively solves the problems of leakage, poor environmental conditions, and high failure rates associated with mechanical transportation of zinc oxide dust, ensuring reliable and stable system operation. 2) This invention completely solves the dust leakage problem in traditional mechanical conveying by adopting a dual sealing design of a pneumatic dome-sealed feed valve and a graphite packing sealing structure, combined with a fully enclosed conveying pipeline. The on-site dust concentration is reduced to below 1mg / m³, meeting the national environmental protection ultra-low emission standards. 3) The present invention is optimized for the characteristics of ultrafine sticky smoke dust with a particle size of 2-15μm and 98% of the particles below 200 mesh. It can process complex components with a sulfur content of up to 8%, expanding the application range of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Serial number and name of the attached drawings: control box 1, conveying pipeline transmitter 3, column A / column B automatic smoke discharge valve 4, equalizing pipe group 5, emergency blockage removal pipe group 6, main blowing device 7, top manual shut-off valve 8, low material level sensor 9, high-resistance rotary material level sensor 10, electric vibrator 11, silo pump 12, pneumatic dome sealing feed valve 13, ash silo top pressure relief box 14. DETAILED DESCRIPTION

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0017] like Figure 1 As shown in the figure, the automatic pneumatic conveying system of zinc oxide smoke from a fuming furnace described in the present invention comprises a control unit, including a control box 1 and a conveying pipeline transmitter 3. The control box 1 is used to receive signals and control the operation of the system, and the conveying pipeline transmitter 3 is used to monitor the state of the conveying pipeline; the material level monitoring unit comprises a high-resistance rotary material level sensor 10 and a low material level sensor 9, which are respectively used to detect the high and low material levels of the material in the ash bin and transmit the signals to the control box 1; the feeding unit comprises a pneumatic dome sealing feeding valve 13 and a homogenizing pipe group 5, a pneumatic The dome-sealed feed valve 13 opens and closes under the command of the control box 1, and the homogenizing pipe group 5 is used to crush the material; the conveying unit, including the main blowing device 7 and the silo pump 12, is used to convey the zinc oxide smoke through the pipeline to the ash silo top pressure relief box 14; the anti-blocking unit, including the accidental blockage pipe group 6, is used to automatically identify and clear the pipeline blockage; the vibration unit, including the electric vibrator 11, is used to prevent the smoke from sticking to the silo wall; the switching unit, including the automatic smoke discharge valves 4 of the A column and the B column, is used to realize the automatic switching of double-column conveying.

[0018] The working process of the feeding unit is as follows: when the high-resistance rotary level sensor 10 detects a high material level, the control box 1 starts the pneumatic dome-sealed feeding valve 13 to close the feeding; when the low material level sensor 9 detects a low material level, the control box 1 starts the homogenizing pipe group 5 to crush the material for 40 seconds, and then starts the main blowing device 7 and the silo pump 12 for transportation.

[0019] The anti-blocking unit 6 monitors the pipeline pressure or flow parameters in real time, and the control box 1 automatically triggers the blocking operation to ensure the normal operation of the system.

[0020] The vibration unit 11 is activated at preset time intervals during the feeding process, and the vibration frequency is adjustable to prevent smoke and dust from accumulating on the warehouse wall.

[0021] The discharge valves of columns A and B of the switching unit 4 are linked by signals from the conveying pipeline transmitter 3. When the conveying of column A is completed, the control box 1 closes the discharge valve of column A and opens the feed valve of column B. When zinc oxide is conveyed from the 7 ash bins in column A, the smoke discharge valve of column B is closed and the automatic feeding of smoke dust in column B is started. Similarly, when zinc oxide is conveyed from the 6 ash bins in column B, the smoke discharge valve of column A is closed and the automatic feeding of smoke dust in the 6 columns of A is started to ensure the stability of system conveying and prevent blockage.

[0022] The pneumatic dome-sealed feed valve 13 adopts a graphite packing sealing chamber and a flange gland cavity structure to ensure sealing performance and system reliability. It automatically opens the feed under the control of the system control box 1 to ensure the normal operation of the automatic smoke unloading, and the sealing pressure is ≥0.6MPa.

[0023] The system's conveying distance is 356 meters, the conveying capacity is ≥25 tons / day, and the availability rate of silo pump 12 is ≥95%.

[0024] The system also includes a top manual shut-off valve 8 for manually isolating materials during emergency shut-off or maintenance.

[0025] After implementing this invention, our company has achieved automated operation and continuous and stable operation of the conveying system through unloading control, greatly improving the system's operating rate and service life, improving the operating and working environment, greatly reducing the accident rate and spare parts consumption, and saving about 210,000 yuan in spare parts costs annually.

Claims

1. An automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace, characterized in that: include: A control unit comprises a control box (1) and a delivery pipeline transmitter (3), wherein the control box (1) is used to receive signals and control system operation, and the delivery pipeline transmitter (3) is used to monitor the state of the delivery pipeline; A material level monitoring unit, comprising a high-resistance rotary material level sensor (10) and a low material level sensor (9), for respectively detecting the high material level and the low material level of the material in the ash bin and transmitting the signal to the control box (1); The feeding unit comprises a pneumatic dome-sealed feeding valve (13) and a homogenizing tube group (5), wherein the pneumatic dome-sealed feeding valve (13) is opened and closed under the instruction of the control box (1), and the homogenizing tube group (5) is used for finely crushing the material; A conveying unit, comprising a main blowing device (7) and a silo pump (12), for conveying zinc oxide smoke to a pressure relief box (14) on the top of the ash silo through a pipeline; An anti-blocking unit, including an accidental blockage removal pipe group (6), is used to automatically identify and clear pipeline blockage; A vibration unit, including an electric vibrator (11), is used to prevent smoke and dust from adhering to the warehouse wall; The switching unit includes automatic smoke and dust discharge valves (4) in column A and column B, and is used to realize automatic switching of double-column conveying.

2. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The working process of the feeding unit is: When the high-resistance rotary level sensor (10) detects a high material level, the control box (1) activates the pneumatic dome-sealed feed valve (13) to close the feed; When the low material level sensor (9) detects a low material level, the control box (1) starts the homogenizing pipe group (5) to crush the material for 40 seconds, and then starts the main blowing device (7) and the silo pump (12) to transport the material.

3. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The anti-blocking unit (6) monitors the pipeline pressure or flow parameters in real time, and the control box (1) automatically triggers the blockage removal operation.

4. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The vibration unit (11) is started at preset time intervals during the feeding process, and the vibration frequency is adjustable.

5. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The discharge valves of column A and column B of the switching unit (4) are linked by signals from the conveying pipeline transmitter (3). When the conveying of column A is completed, the control box (1) closes the discharge valve of column A and opens the feed valve of column B.

6. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The pneumatic dome-sealed feed valve (13) adopts a graphite packing sealing chamber and a flange gland chamber structure, and the sealing pressure is ≥0.6 MPa.

7. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The conveying distance of the system is 356 meters, the conveying capacity is ≥25 tons / day, and the integrity rate of the silo pump (12) is ≥95%.

8. The automatic pneumatic conveying system for zinc oxide smoke from a fuming furnace according to claim 1, characterized in that: The system also includes a top manual shut-off valve (8) for manually isolating materials during emergency shut-off or maintenance.

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