Energy-saving system for flash converting copper

Abstract

The utility model discloses a kind of flash converting copper energy-saving systems, belong to non-ferrous smelting energy-saving field, including several anode furnace, high-temperature fan, anode furnace bag dust collector, anode furnace bag dust collector fan, desulfurization and denitrification washing tower, induced draft fan unit, desulfurization and denitrification absorption tower, vertical mill hot blast stove, converting furnace vertical mill, vertical mill bag dust collector, vertical mill bag dust collector fan. By optimizing the mixed flue gas of anode furnace, anode furnace high-temperature flue gas (180~350 ℃) is introduced into vertical mill system, and flue gas waste heat is used to replace traditional natural gas hot blast stove heating, so that natural gas consumption is reduced to 0Nm³ / h. By valve control, mixed flue gas temperature is controlled to 200~280 ℃, to ensure that the temperature of flue gas at the outlet of vertical mill is stable at 95~105 ℃, to meet the drying demand of copper matte. The exhaust port of vertical mill is cancelled, and the flue gas of vertical mill and the mixed flue gas of anode furnace after waste heat utilization are combined, and then sent to the desulfurization and denitrification system of anode furnace for treatment, to realize ultra-low emission of SO2, NOx and particulate matter.

Description

Technical Field

[0001] This utility model relates to the field of copper metallurgy, and in particular to an energy-saving system for flash copper smelting. Background Technology

[0002] In copper pyrometallurgical systems for non-ferrous metals, the vertical mill system in the blowing furnace relies excessively on natural gas for heating to dry materials, resulting in high energy consumption and significant carbon emissions. Current technologies lack effective means to reduce the energy consumption of vertical mills in the blowing furnace. Meanwhile, the treatment of anode furnace flue gas mostly remains at the stage of simple combined treatment, lacking systematic solutions for waste heat utilization and in-depth treatment. Generally, enterprises directly transport the waste flue gas generated during anode furnace production at temperatures of 180–350°C to the acid production process or the collection and treatment process for combined treatment to meet emission standards, without utilizing the waste heat in the flue gas, resulting in a certain amount of thermal energy waste.

[0003] This invention enables the thermal coupling of anode furnace flue gas and vertical mill drying process, effectively utilizing the waste heat of flue gas and providing a new approach to energy conservation and emission reduction for smelting-related enterprises. Utility Model Content

[0004] The purpose of this utility model is to provide an energy-saving system for flash copper smelting, and a method that integrates reducing natural gas consumption, efficiently utilizing waste heat from flue gas in other production processes, and reducing waste gas emissions from the production system in a flash furnace vertical mill, thereby achieving energy conservation, emission reduction, and comprehensive resource utilization.

[0005] This utility model is achieved through the following technical solution: A flash copper smelting energy-saving system includes several anode furnaces, a high-temperature blower, an anode furnace bag filter dust collector, an anode furnace bag filter dust collector blower, a desulfurization and denitrification scrubbing tower, an induced draft fan unit, a desulfurization and denitrification absorption tower, a vertical mill hot blast stove, a vertical mill for the smelting furnace, a vertical mill bag filter dust collector, and a vertical mill bag filter dust collector blower. The several anode furnaces are connected in parallel, and the flue gas outlet of each anode furnace is connected to a secondary combustion chamber via an arc-shaped fume hood. Each secondary combustion chamber is equipped with a water-cooled tube bundle outlet and a non-water-cooled tube bundle outlet in parallel. The water-cooled tube bundle outlet and the non-water-cooled tube bundle outlet are connected in parallel to the inlet pipe of the high-temperature blower via connecting pipes. The outlet of the high-temperature blower is connected to... The system is connected in parallel to the main flue gas duct. At the end of the main flue gas duct, there are two flue gas branches. One branch is connected to the anode furnace bag filter dust collector, and the other branch is connected to the vertical mill of the blowing furnace. The anode furnace bag filter dust collector, the anode furnace bag filter dust collector fan, the desulfurization and denitrification scrubbing tower, the induced draft fan unit, and the desulfurization and denitrification absorption tower are connected in sequence through pipes. A bypass is provided on the inlet pipe of the vertical mill of the blowing furnace, which is connected to the hot blast stove of the vertical mill. The vertical mill of the blowing furnace, the vertical mill bag filter dust collector, and the vertical mill bag filter dust collector fan are connected in sequence through pipes. The vertical mill bag filter dust collector fan is connected in parallel through pipes to the inlet pipe of the anode furnace bag filter dust collector fan.

[0006] Furthermore, a water-cooled tube bundle outlet pipe and a non-water-cooled tube bundle outlet pipe are respectively provided.

[0007] Furthermore, valves are installed on the two flue gas branches, on the pipes between the vertical mill of the blowing furnace and the vertical mill bag dust collector, and on the outlet pipe of the vertical mill bag dust collector fan.

[0008] Furthermore, there are three anode furnaces.

[0009] Furthermore, the induced draft fan unit includes at least two induced draft fans connected in parallel between the outlet pipe of the desulfurization and denitrification scrubbing tower and the inlet pipe of the desulfurization and denitrification absorption tower.

[0010] Furthermore, both the desulfurization and denitrification absorption tower and the desulfurization and denitrification scrubbing tower are dynamic wave packed towers.

[0011] This invention uses water-cooled and non-water-cooled tube bundle valves to regulate the flue gas flow of the anode furnace, achieving flue gas disconnection and short-circuiting, thereby regulating the temperature of the mixed flue gas. A new mixed flue gas pipeline is laid, directly connected to the outlet pipeline of the vertical mill hot air furnace, allowing the flue gas to enter the vertical mill system for waste heat utilization. The pipeline is insulated to ensure the flue gas temperature at the vertical mill outlet is between 95 and 105°C, meeting the production requirements of the vertical mill. Simultaneously, the original vertical mill exhaust port is eliminated; the flue gas, after waste heat utilization, is connected to the anode furnace desulfurization and denitrification system via a newly laid exhaust pipeline. The anode furnace flue gas desulfurization and denitrification system employs a dynamic wave packed tower washing and cooling + alkaline absorption desulfurization and denitrification (ozone oxidation) + wet electrostatic precipitator process for flue gas treatment. A vertical mill bag filter is also used to recover dust entrained in the flue gas, with a recovery rate ≥98%.

[0012] The principle of this invention is as follows: The waste heat of the anode furnace flue gas (mixed flue gas temperature 200-280℃) is used to replace the combustion heat of natural gas. The mixing ratio of the anode furnace flue gas under different production conditions is adjusted by valves to precisely control the mixed flue gas temperature. When the flue gas temperature is insufficient, the opening of the water-cooled tube bundle valve is reduced to increase the proportion of high-temperature flue gas; when the temperature is too high, the opening of the water-cooled tube bundle valve is increased to reduce the flue gas temperature, achieving a wide temperature range of 200-280℃.

[0013] In summary, the advantages of this utility model are: First, it efficiently utilizes waste heat, reducing energy consumption. It replaces natural gas heating: high-temperature mixed flue gas from the anode furnace (180–350℃) is introduced into the vertical mill system, replacing the natural gas combustion heat from the hot blast stove. This reduces the natural gas consumption of the vertical mill system to 0 Nm³ / h, significantly lowering energy costs. Second, it precisely controls temperature: by adding valves to the outlet pipe of the secondary combustion chamber of the anode furnace, it controls the open and short circuits of the flue gas, achieving a wide temperature range of 200–280℃ for the mixed flue gas. This ensures the outlet flue gas temperature of the vertical mill remains stable at 95–105℃, meeting production requirements. Finally, it reduces production energy consumption: energy consumption per ton of anode copper production can be reduced by more than 5 kgce, significantly improving energy utilization efficiency.

[0014] Second, reduce pollutant emissions and achieve ultra-low emissions. Separate flue gas treatment: After waste heat utilization, the flue gas from the anode furnace is introduced into a desulfurization and denitrification system to reduce SO2 and NO in the flue gas. x The particulate matter content meets ultra-low emission standards, satisfying the emission requirements for Class A enterprises. Dust resource recovery: Vertical grinding bag dust collectors and secondary bag dust collectors are used to recover dust entrained in the flue gas, with a recovery rate of ≥99%, reducing dust emissions while achieving resource reuse.

[0015] Third, optimize system design to improve overall efficiency. Combine exhaust outlets: Eliminate the vertical mill tail gas exhaust outlet and integrate the vertical mill exhaust gas with the anode furnace mixed flue gas into the desulfurization and denitrification system for treatment. This reduces the total exhaust gas volume of the vertical mill system and the anode furnace flue gas treatment system, achieving energy conservation and emission reduction. Insulate pipelines: Insulate the laid anode furnace mixed flue gas pipelines to reduce heat loss, ensure stable flue gas temperature at the vertical mill outlet, and ensure the reliability of the production process. Provide new ideas: Achieve thermal coupling between anode furnace flue gas and the vertical mill drying process, providing a new technical approach and solution for energy conservation and emission reduction in smelting-related enterprises.

[0016] Fourth, it offers significant economic and environmental benefits. Reduced production costs: Reduced natural gas consumption lowers energy procurement costs and improves corporate economic efficiency. Responding to cleaner production: Through waste heat utilization, reduced emissions, and dust recovery, it meets cleaner production requirements, enhances the company's environmental image, and helps achieve its "dual carbon" goals. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0019] A flash copper smelting energy-saving system, such as Figure 1As shown, the system includes a first anode furnace 21, a second anode furnace 22, a third anode furnace 23, a first high-temperature fan 41, a second high-temperature fan 42, a third high-temperature fan 43, an anode furnace bag filter dust collector 1, an anode furnace bag filter dust collector fan 6, a desulfurization and denitrification scrubbing tower 7, an induced draft fan unit, a desulfurization and denitrification absorption tower 13, a vertical mill hot blast stove 9, a smelting furnace vertical mill 10, a vertical mill bag filter dust collector 11, and a vertical mill bag filter dust collector fan 12. The first anode furnace 21, the second anode furnace 22, and the third anode furnace 23 are connected in parallel. The flue gas outlet of the first anode furnace 21 is connected to a first secondary combustion chamber 31 through an arc-shaped fume hood. The flue gas outlet of the second anode furnace 22 is connected to a second secondary combustion chamber 32 through an arc-shaped fume hood. The flue gas outlet of the third anode furnace 23 is connected to a third secondary combustion chamber 33 through an arc-shaped fume hood. Each secondary combustion chamber is equipped with a water-cooled tube bundle outlet and a non-water-cooled tube bundle outlet in parallel. The outlet of the tube bundle and the outlet of the non-water-cooled tube bundle are connected in parallel to the inlet pipe of the high-temperature fan through connecting pipes. The outlets of the first high-temperature fan 41, the second high-temperature fan 42, and the third high-temperature fan 43 are connected in parallel to the flue gas main pipe through pipes. The end branch of the flue gas main pipe is provided with two flue gas branches. One branch is connected to the anode furnace bag dust collector, and the other branch is connected to the vertical mill 10 of the blowing furnace. The anode furnace bag dust collector 1, the anode furnace bag dust collector fan 6, the desulfurization and denitrification scrubbing tower 7, the induced draft fan unit, and the desulfurization and denitrification absorption tower 13 are connected in sequence through pipes. A bypass is provided on the inlet pipe of the vertical mill 10 of the blowing furnace, which is connected to the vertical mill hot air furnace 9. The vertical mill 10 of the blowing furnace, the vertical mill bag dust collector 11, and the vertical mill bag dust collector fan 12 are connected in sequence through pipes. The vertical mill bag dust collector fan 12 is connected in parallel to the inlet pipe of the anode furnace bag dust collector fan 6 through pipes.

[0020] A water-cooled tube bundle outlet pipe is provided with a water-cooled tube bundle valve 51 and a water-cooled tube bundle outlet pipe is provided with a water-cooled tube bundle valve 52.

[0021] Valves are installed on the two flue gas branches, on the pipes between the vertical mill 10 of the blowing furnace and the vertical mill bag dust collector 11, and on the outlet pipe of the vertical mill bag dust collector fan 12.

[0022] The induced draft fan unit includes at least two induced draft fans 81 and 82 connected in parallel between the outlet pipe of the desulfurization and denitrification scrubbing tower 7 and the inlet pipe of the desulfurization and denitrification absorption tower 13. Both the desulfurization and denitrification absorption tower 7 and the desulfurization and denitrification scrubbing tower 13 are dynamic wave packed towers.

[0023] Three new sets of water-cooled tube bundle valves 51 and non-water-cooled tube bundle valves 52 are added to regulate the flue gas flow of the three anode furnaces. By controlling the open and short circuits of the flue gas, the temperature of the mixed flue gas is regulated. The mixed flue gas pipeline of the anode furnace is re-laid and directly connected to the outlet pipeline of the hot blast stove 10 of the vertical mill in the blowing furnace, so that the flue gas can enter the vertical mill system for waste heat utilization. The pipeline is insulated to ensure that the flue gas temperature at the outlet of the vertical mill is between 95 and 105°C, which meets the production needs of the vertical mill. At the same time, the original external exhaust port of the vertical mill is removed, and the flue gas that has utilized its waste heat is connected to the anode furnace tail gas desulfurization and denitrification system through the newly laid external exhaust gas pipeline.

[0024] During production, the first anode furnace 21 performs reduction, the second anode furnace 22 performs casting, and the third anode furnace 23 awaits material. In daily production, the flue gas volume of each anode furnace is measured to be between 28,000 and 32,000 Nm³. 3 The combined flue gas volume of the three anode furnaces is approximately 85,000 to 100,000 Nm³ / h. 3 / h, SO2 concentration in flue gas is less than 1400 mg / Nm³ 3 NO x Concentration 250–400 mg / Nm 3 Particulate matter concentration less than 200 mg / Nm 3 The flue gas temperature is between 180 and 350℃. The desulfurization and denitrification scrubbing tower 7, the induced draft fan unit, and the desulfurization and denitrification absorption tower 13 are all packed towers. The equipment body and the circulation tank are all made of integral fiberglass structure. Each is equipped with an SD-B mist eliminator at the top, and the chimney is located on top of the wet electrostatic precipitator.

[0025] A purchased 30wt% sodium hydroxide solution, after being buffered in an alkali tank, is pumped into the desulfurization and denitrification absorption tower 13 by an alkali transfer pump. The reacted flue gas is then sent into the desulfurization and denitrification absorption tower 13 by an induced draft fan, where it first reacts with the sodium hydroxide solution to remove SO2 and NO from the flue gas. x Remove SO2 and NO x After the flue gas passes through the upper mist eliminator to remove large droplets, it enters the top high-efficiency wet electrostatic precipitator to remove the remaining smaller particles and heavy metals. Once the emission standards are met, the flue gas is discharged through the top chimney, which is 42m high (1.6m in diameter and 16m in straight section).

[0026] When the vertical mill system is in normal operation with material, the system's heat demand increases significantly. The following adjustment measures are taken: The water-cooled tube bundle valve 51 is closed, and the anode furnace flue gas non-water-cooled tube bundle valve 52 is opened and adjusted to increase the temperature of the mixed flue gas. Simultaneously, the valve leading to the vertical mill 10 in the blowing furnace is opened wider, while the valve leading to the anode furnace bag filter 1 is correspondingly closed, causing most of the mixed flue gas to flow directionally into the vertical mill system. This ensures that the outlet flue gas temperature of the vertical mill is precisely controlled within the range of 95–105℃, thereby fully meeting the process requirements for material-carrying operation of the vertical mill.

[0027] When shutting down the vertical mill in the blowing furnace, gradually open the valve 52 of the anode furnace water-cooled tube bundle in advance to allow the flue gas from the anode furnace to cool down through the water-cooled tube bundle. Gradually close the valve of the mixed flue gas to the vertical mill 10 in the blowing furnace, and simultaneously open the valve of the mixed flue gas to the anode furnace bag filter 1 to divert the mixed flue gas to the desulfurization and denitrification system, reducing the amount of flue gas entering the vertical mill system and thus reducing the heat input to the vertical mill system. During valve adjustment, continuously and closely monitor the flue gas temperature at the outlet of the vertical mill. When the temperature drops to near 95°C, slow down the valve adjustment speed to prevent the temperature from dropping too quickly. Once the flue gas temperature at the outlet of the vertical mill has stabilized below 95°C and it is confirmed that the material inside the vertical mill has been processed, stop the operation of the relevant equipment in the vertical mill system, including the main drive motor and fan, in sequence according to the equipment operation procedures. After the mill is shut down, a comprehensive inspection of the entire vertical mill system and the flue gas system of the anode furnace is carried out to ensure that all relevant valves are closed, all equipment is in a shutdown state to prevent flue gas or material leakage, and equipment maintenance is carried out to prepare for the next startup.

[0028] The technical solutions described in this utility model are not limited to the scope of the embodiments described in this utility model. All technical contents not described in detail in this utility model are publicly known technologies.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of specific implementations of the utility model and not to limit it. Those skilled in the art should understand that any equivalent substitutions or obvious modifications made to the implementation of the utility model without changing its performance or use, without violating the spirit of the utility model, should be covered within the scope of protection claimed by the utility model.

Claims

1. A flash copper smelting energy-saving system, characterized in that, The system includes several anode furnaces, high-temperature blowers, anode furnace baghouse dust collectors, anode furnace baghouse dust collector blowers, desulfurization and denitrification scrubbing towers, induced draft fans, desulfurization and denitrification absorption towers, vertical mill hot blast stoves, vertical mills in smelting furnaces, vertical mill baghouse dust collectors, and vertical mill baghouse dust collector blowers. The anode furnaces are connected in parallel, and the flue gas outlet of each anode furnace is connected to a secondary combustion chamber via an arc-shaped fume hood. Each secondary combustion chamber is equipped with a water-cooled tube bundle outlet and a non-water-cooled tube bundle outlet in parallel. The water-cooled tube bundle outlet and the non-water-cooled tube bundle outlet are connected in parallel to the inlet pipe of the high-temperature blower via connecting pipes. The outlet of the high-temperature blower is connected in parallel via pipes. The main flue gas duct has two branch flue gas lines at its end. One branch line connects to the anode furnace bag filter dust collector, and the other branch line connects to the vertical mill of the blowing furnace. The anode furnace bag filter dust collector, the anode furnace bag filter dust collector fan, the desulfurization and denitrification scrubbing tower, the induced draft fan unit, and the desulfurization and denitrification absorption tower are connected in sequence through pipelines. A bypass is provided on the inlet pipe of the vertical mill of the blowing furnace, which is connected to the hot blast stove of the vertical mill. The vertical mill of the blowing furnace, the vertical mill bag filter dust collector, and the vertical mill bag filter dust collector fan are connected in sequence through pipelines. The vertical mill bag filter dust collector fan is connected in parallel to the inlet pipe of the anode furnace bag filter dust collector fan through pipelines.

2. The flash copper smelting energy-saving system according to claim 1, characterized in that, A water-cooled tube bundle outlet pipe and a non-water-cooled tube bundle outlet pipe are respectively equipped with a water-cooled tube bundle valve and a non-water-cooled tube bundle valve.

3. The flash copper smelting energy-saving system according to claim 1, characterized in that, Valves are installed on the two flue gas branches, on the pipes between the vertical mill of the blowing furnace and the vertical mill bag dust collector, and on the outlet pipe of the vertical mill bag dust collector fan.

4. The flash copper smelting energy-saving system according to claim 1, characterized in that, There are three anode furnaces.

5. The flash copper smelting energy-saving system according to claim 1, characterized in that, The induced draft fan unit includes at least two induced draft fans connected in parallel between the outlet pipe of the desulfurization and denitrification scrubbing tower and the inlet pipe of the desulfurization and denitrification absorption tower.

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