Reclaimed copper smelting flue gas treatment method and system

Abstract

The invention provides a secondary copper smelting flue gas treatment method and system, and the method comprises the steps: obtaining a predicted input flow according to the input information of a smelting furnace, and obtaining a first target flow according to the predicted input flow and a preset air leakage rate; and the ventilation quantity of a fan on the output side of the dust collection module is adjusted according to the first target flow, so that the first flow reaches the first target flow. According to the control target of increasing the input flow of the dust collection module according to the air leakage rate, the ventilation quantity of the fan is automatically regulated and controlled, the air leakage quantity is matched, the risk that the smoke temperature is reduced to the dioxin resynthesis temperature interval from the dioxin inhibition temperature and the smoke escapes from the air leakage position can be effectively avoided, and the service life of the dust collection module is prolonged. And the overall flue gas treatment reliability is ensured when the fluctuation of the input flue gas amount is relatively large.

Description

Technical Field

[0001] This invention relates to the field of industrial flue gas purification technology, and in particular to a method and system for treating flue gas from recycled copper smelting. Background Technology

[0002] Comprehensive utilization of recycled copper resources is a crucial aspect of achieving a circular economy in China. However, during the recycled copper smelting process, the waste copper raw materials often contain chlorinated organic matter such as plastics, grease, and paint. Incomplete combustion and complex chemical reactions within the smelting furnace lead to the generation and emission of highly toxic dioxins in the flue gas, posing a serious threat to the environment and public health. The most widely used technology is the combined process of "activated carbon injection + bag filter." This involves injecting powdered activated carbon into the flue gas, utilizing its large specific surface area to adsorb dioxins in the gas phase. Subsequently, a bag filter captures the activated carbon particles containing the dioxins.

[0003] In particular, air leakage is common in parts such as pipe connection flanges and ash discharge valves in the flue gas treatment system. The flue gas transportation in the system is mainly achieved by the negative pressure provided by the back-end fan. The air drawn in by the leakage will occupy the flue gas transportation flow and reduce the flue gas treatment efficiency. Especially when multiple smelting furnaces are running in parallel, the total exhaust volume of the smelting furnace fluctuates significantly.

[0004] In existing technologies, the ventilation volume of the back-end fan is fixed. When the total exhaust volume of the smelting furnace is small, too much cold air will be drawn in, causing the flue gas temperature to drop from the dioxin inhibition temperature to the dioxin resynthesis temperature range, reducing the reliability of the treatment. When the total exhaust volume of the smelting furnace is large, the flue gas conveying capacity is insufficient, and the flue gas will escape from the air leakage point, causing pollution and insufficient reliability. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a method and system for treating flue gas from recycled copper smelting, so as to solve the problem that the ventilation volume of the back-end fan in the existing flue gas treatment system is fixed, and it is difficult to ensure the reliability of dioxin treatment when the total flue gas volume of the smelting furnace fluctuates greatly.

[0006] This invention provides a method for treating flue gas from recycled copper smelting, for treating dioxins in the flue gas, comprising: Cool the incoming flue gas; The cooled flue gas was subjected to adsorption treatment to obtain an adsorbent containing dioxins. The adsorbent containing dioxins is collected by the dust collection module, and the first flow rate at the input side of the dust collection module is collected. In addition, the expected input flow rate is obtained based on the furnace input information, and the first target flow rate is obtained based on the expected input flow rate and the preset air leakage rate; Adjust the ventilation volume of the fan on the output side of the dust collection module according to the first target flow rate so that the first flow rate reaches the first target flow rate.

[0007] Optionally, it further includes: collecting the actual input flow rate of the input flue gas, and when the actual input flow rate meets the preset steady-state conditions, obtaining a second target flow rate based on the actual input flow rate and a preset air leakage rate, and modifying the adjustment target of the first flow rate to the second target flow rate, so as to adjust the ventilation volume of the fan on the output side of the dust collection module according to the second target flow rate, so that the first flow rate reaches the second target flow rate.

[0008] Optionally, the steady-state condition includes: the slope of the actual input flow is less than or equal to a preset slope threshold, and the fluctuation amplitude within the current sampling period is less than or equal to a preset fluctuation range, wherein the sampled value of the actual input flow in the current sampling period is the average value within the current sampling period.

[0009] Optionally, it further includes: obtaining an input difference based on the difference between the expected input flow and the current input flow, obtaining a correction amount based on the product of the input difference and a preset correction coefficient, and adding the correction amount to the first target flow to update the first target flow.

[0010] Optionally, the method further includes acquiring the oscillation characteristics of the first flow rate and adjusting the correction coefficient based on the oscillation characteristics to suppress the oscillation of the first flow rate, wherein... When the oscillation characteristics meet the high-frequency condition, the correction coefficient is reduced; When the oscillation characteristics meet the large amplitude condition, the correction coefficient is increased.

[0011] Another aspect of the present invention provides a recycled copper smelting flue gas treatment system for dioxin treatment in the flue gas, comprising: a flue gas input module, a cooling module, an adsorption module, a dust collection module, and a flue gas exhaust module connected in sequence, and a main controller, wherein... The flue gas input module is provided with multiple input terminals in parallel to connect to the exhaust flue gas from multiple smelting furnaces in parallel. The dust collection module is equipped with a flow meter in its input pipeline and a fan in its output pipeline, which is connected to the smoke exhaust module. The main controller is used to adjust the ventilation volume of the fan according to the above-mentioned method for treating flue gas from recycled copper smelting.

[0012] Optionally, the gas distribution plate has a diamond-shaped opening with an opening ratio greater than 80%.

[0013] Optionally, the cooling module includes a cooling fume hood and a spiral jacketed condenser arranged in sequence.

[0014] The method for treating recycled copper smelting flue gas provided by this invention obtains the expected input flow rate based on the furnace input information, and obtains a first target flow rate based on the expected input flow rate and a preset leakage rate. The ventilation volume of the fan on the output side of the dust collection module is adjusted according to the first target flow rate to ensure that the first flow rate reaches the first target flow rate. This invention increases the input flow rate of the dust collection module based on the leakage rate, automatically adjusts the fan ventilation volume to match the leakage rate, and can effectively avoid the risk of the flue gas temperature dropping from the dioxin inhibition temperature to the dioxin resynthesis temperature range, as well as the risk of flue gas escaping from leakage points, ensuring the overall reliability of flue gas treatment when the input flue gas volume fluctuates significantly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the recycled copper smelting flue gas treatment system in an embodiment of the present invention; Figure 2 This is a flowchart of the main process for treating the flue gas from recycled copper smelting in an embodiment of the present invention.

[0016] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0018] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] To address the problem that existing flue gas treatment systems with fixed back-end fan ventilation volumes struggle to guarantee reliable dioxin treatment when the total flue gas volume from the smelting furnace flues significantly, this invention provides a method for treating flue gas from recycled copper smelting. The method obtains the expected input flow rate based on the smelting furnace's input information, and then determines a first target flow rate based on the expected input flow rate and a preset leakage rate. The ventilation volume of the fan on the output side of the dust collection module is adjusted according to the first target flow rate to achieve this target flow rate. By increasing the input flow rate of the dust collection module based on the leakage rate, the method automatically regulates the fan's ventilation volume to match the leakage rate. This effectively prevents the flue gas temperature from dropping from the dioxin suppression temperature to the dioxin resynthesis temperature range, and avoids the risk of flue gas escaping through leakage points, ensuring overall flue gas treatment reliability even with large fluctuations in the input flue gas volume.

[0021] Specifically, such as Figure 1 As shown, the recycled copper smelting flue gas treatment system of this embodiment uses adsorption to treat dioxins in the flue gas, including: a flue gas input module, a cooling module, an adsorption module, a dust collection module and a flue gas exhaust module connected in sequence, as well as a main controller.

[0022] The flue gas input module mainly consists of an inlet duct 2, which has multiple input terminals connected in parallel to connect to the exhaust flue gas from multiple smelting furnaces 1. The cooling module cools the incoming flue gas to below 250°C to prevent the re-synthesis of dioxins. The adsorption module introduces adsorbent into the pipeline, allowing dioxins to adhere to it. The dust collection module collects the adsorbent, ensuring that dioxins are collected along with it. Flue gas free of dioxins is then discharged through the exhaust module.

[0023] Multiple branch pipes can be set at the multiple input ends of the flue gas inlet pipe 2. Each branch pipe is equipped with a valve to control the switch and flow rate, so as to prevent the flue gas from flowing back to the unstarted smelting furnace and ensure the unidirectionality of the flue gas transportation.

[0024] A flow meter 12 is installed in the input pipeline of the dust collection module, and the output pipeline 17 is connected to the fan 18. The fan 18 is connected to the chimney 20 through the connecting pipeline 19. The fan 18 provides negative pressure to the bag filter dust collector 13 to stabilize the conveying direction of the flue gas.

[0025] The main controller (not shown in the figure) is used to obtain the first target flow rate by multiplying the expected input flow rate of the total flue gas volume of the connected smelting furnace 1 by the preset leakage rate, where Q1=Q0*P, Q1 is the first target flow rate, Q0 is the expected input flow rate, and P is the preset leakage rate, which is pre-determined. The leakage rate is generally between 13% and 15%, and the specific data is determined according to the actual situation. It is also affected by the pressure difference inside and outside the pipeline. When the flue gas flow rate in the pipeline changes, the leakage rate usually follows. Therefore, when the input flue gas volume changes, the real-time leakage rate can also be obtained based on the oxygen content of the input flue gas and the oxygen content of the flue gas at the end of the pipeline, and the preset leakage rate is used to replace the real-time leakage rate.

[0026] After obtaining the first target flow rate, the ventilation volume of the fan 18 on the output side of the dust collection module is adjusted according to the first target flow rate so that the first flow rate reaches the first target flow rate.

[0027] By monitoring the total exhaust volume of the connected smelting furnace and combining it with the air leakage rate, the negative pressure of the flue gas conveying drive provided by the fan 18 can be increased in advance. This can effectively match the air leakage phenomenon of the system, avoid flue gas leakage, and avoid drawing in too much cold air, thereby improving the driving efficiency of the fan (part of the driving force used to draw in cold air is ineffective work) and improving the energy efficiency of the flue gas treatment system.

[0028] To improve the dust removal efficiency of solid particles in flue gas, in this embodiment, the adsorption module includes a cyclone flame arrester 5 and an adsorption pipeline 4 arranged in sequence. Two gas distribution plates (a first gas distribution plate 7 and a second gas distribution plate 9) are arranged in sequence at intervals in the adsorption pipeline 4 to form a first adsorption chamber and a second adsorption chamber downstream of the two gas distribution plates, respectively. The first adsorption chamber and the second adsorption chamber are respectively connected to a calcium oxide pneumatic conveyor device 8 and an activated carbon pneumatic conveyor device 9 to obtain calcium oxide adsorbent and activated carbon adsorbent from the calcium oxide pneumatic conveyor device 8 and the activated carbon pneumatic conveyor device 9, respectively.

[0029] To ensure the adsorption effect, the conveying capacity of the calcium oxide pneumatic conveyor device 8 and the activated carbon pneumatic conveyor device 9 is adjusted according to the expected and real-time input flow rates of the flue gas to ensure the adsorption effect.

[0030] Specifically, the expected adsorption target (the amount of adsorbable substances in the flue gas) is obtained based on the expected input flow rate and flue gas composition. The expected amount of adsorbent is then determined based on the expected adsorption target and the adsorption capacity of the unit adsorbent. The conveying capacity of the calcium oxide pneumatic conveyor device 8 and the activated carbon pneumatic conveyor device 9 is increased in advance to the expected amount. A correction ratio is obtained based on the difference between the real-time input flow rate and the expected input flow rate. The actual conveying capacity of the calcium oxide pneumatic conveyor device 8 and the activated carbon pneumatic conveyor device 9 is adjusted according to the correction ratio to control the actual conveying capacity to gradually increase to the expected amount as the actual input flow rate changes. At the same time, the actual conveying capacity is guaranteed to have a certain amount of lead time to ensure that the adsorption capacity of the added calcium oxide adsorbent and activated carbon adsorbent is greater than the real-time adsorption target, thus ensuring the adsorption effect.

[0031] To ensure the reliability of adsorbent delivery, the ventilation volume of the fan is also adjusted synchronously. The corrected ventilation volume is obtained by multiplying the actual delivery volume of the calcium oxide pneumatic conveyor device 8 and the activated carbon pneumatic conveyor device 9 with the preset proportional coefficient. The corrected ventilation volume is then added to the fan's first target flow rate in real time, so that the fan can effectively drive the increased adsorbent in the pipeline and avoid the interference of changes in the amount of adsorbent added on the ventilation capacity.

[0032] Cyclone flame arrester 5 can also be used to initially collect larger particles in flue gas. The collected material is discharged to the buried scraper conveyor 15. The collected material from the bag dust collector 13 is discharged to the buried scraper conveyor 15 through the gravity flap valve 14 at the bottom. It is then collected by the buried scraper conveyor 15 and discharged through the ash hopper 16.

[0033] To improve flue gas conveying efficiency, in this embodiment, the gas distribution plate has a diamond-shaped opening with an opening rate of more than 80%, which can reduce the resistance of the gas distribution plate to flue gas conveying and save energy consumption of the fan 18.

[0034] To prevent the resynthesis of dioxins in the flue gas during treatment, in this embodiment, the cooling module includes a cooling hood and a spiral jacketed condenser 3 arranged sequentially. The cooling hood is located at the input end of the flue gas inlet duct 2 and rapidly cools the output flue gas from the smelting furnace 1, reducing the flue gas temperature from 1100°C to 600°C (above the suppression temperature, which can inhibit dioxin synthesis). The spiral jacketed condenser 3 further cools the flue gas rapidly to below 250°C, reducing the residence time of the flue gas in the resynthesis temperature range (250°C-500°C), thereby reducing the amount of dioxins resynthesized and ensuring the dioxin treatment effect.

[0035] The spiral jacketed condenser 3 has a spiral guide plate inside the jacket to improve heat exchange efficiency and ensure rapid cooling. The coolant flow rate in the spiral jacketed condenser 3 is adjusted in real time according to the input flue gas volume to ensure that the flue gas temperature is reduced to below 250°C after passing through the spiral jacketed condenser 3. The coolant flow rate control method is the same as the ventilation volume control method, and will not be described in detail here.

[0036] To avoid the influence of temperature on the flue gas pressure in the pipeline, the flue gas temperature input and output through the spiral jacketed condenser 3 is also monitored, and the coolant flow rate of the spiral jacketed condenser 3 is adjusted according to the flue gas temperature to keep the output flue gas temperature within the preset temperature range.

[0037] In one specific example, three smelting furnaces are connected in parallel, with a total flue gas volume of 44,600 m³ / h and a jacket water flow velocity of 3.5 m / s, providing a cooling of 350°C, reducing the flue gas temperature from 600°C to 250°C. With an air leakage rate of 15%, the final ventilation volume of the blower is 51,260 m³ / h.

[0038] To improve the reliability of pipeline fixing and reduce the risk of increased air leakage due to mechanical damage, the flue gas inlet pipe 2, the spiral jacketed condenser 3, and the cyclone flame arrester 5 are supported and fixed by the first support frame 6, and the adsorption pipe 4 is supported and fixed by the second support frame 11. This can improve the fixing reliability of pipeline hardware and reduce the impact of the cumulative effect of flue gas flow impact on connection reliability.

[0039] The method for treating recycled copper smelting flue gas provided by this invention is used in the aforementioned recycled copper smelting flue gas treatment system, and the main treatment process is as follows: Figure 2 As shown, it includes: Step S01: Cool the incoming flue gas; Step S02: The cooled flue gas is subjected to adsorption treatment to obtain an adsorbent containing dioxins. Step S03: Collect the adsorbent containing dioxins through the dust collection module and collect the first flow rate on the input side of the dust collection module; And, step S04: obtain the expected input flow rate based on the furnace input information, and obtain the first target flow rate based on the expected input flow rate and the preset air leakage rate; Step S05: Adjust the ventilation volume of the fan on the output side of the dust collection module according to the first target flow rate so that the first flow rate reaches the first target flow rate.

[0040] The information on the commissioning of smelting furnaces includes the number of smelting furnaces in operation, as well as the target exhaust volume and exhaust delay of each smelting furnace, in order to obtain the expected input flow rate.

[0041] Flue gas fluctuations mainly occur during the commissioning of the smelting furnace. After the smelting furnace has been in operation for a certain period of time, the flue gas volume tends to stabilize. However, due to the difference between the actual working state and the ideal working state of the smelting furnace, the actual input flow rate often differs from the expected input flow rate. The matching degree between the first target flow rate obtained based on the expected input flow rate and the air leakage rate decreases, leading to flue gas leakage or excessive intake of cold air, which affects the flue gas treatment efficiency and reliability.

[0042] To reduce the impact of the difference between the actual steady state and the expected state of the system on the efficiency and reliability of flue gas treatment, this embodiment further includes: collecting the actual input flow rate of the input flue gas, and when the actual input flow rate meets the preset steady state conditions, obtaining the second target flow rate based on the actual input flow rate and the preset air leakage rate, and modifying the adjustment target of the first flow rate to the second target flow rate, so as to adjust the ventilation volume of the fan on the output side of the dust collection module according to the second target flow rate, so that the first flow rate reaches the second target flow rate.

[0043] The steady-state conditions include: the slope of the actual input flow rate is less than or equal to a preset slope threshold, and the fluctuation range within the current sampling period is less than or equal to a preset fluctuation range. The sampled value of the actual input flow rate in the current sampling period is the average value within that period. The sampling period can be adjusted according to the system state. For example, in steady state, the sampling period is 30 seconds. When the number of smelting furnaces changes, the input flue gas changes, or the system needs to regulate ventilation, the sampling period can be shortened, for example, to 5 seconds or 2 seconds. The specific sampling period is adjusted according to the actual situation; for example, the greater the slope of the input flue gas change, the shorter the sampling period, to ensure effective regulation. Within the sampling period, sampling data is provided according to the sensor's sampling period. The averaged sampling data is then used as the output data for the corresponding sampling period.

[0044] To reduce the oscillation of flue gas pressure in the pipeline caused by the difference between the input flue gas and the ventilation volume, this embodiment further includes: obtaining an input difference value based on the difference between the expected input flow rate and the current input flow rate; obtaining a correction amount based on the product of the input difference value and a preset correction coefficient; and adding the correction amount to the first target flow rate to update the first target flow rate, wherein the correction amount is a positive value.

[0045] When increasing the number of smelting furnaces, the expected input flow rate is the total rated flue gas volume of the smelting furnaces. In the early stages of furnace operation, the current input flow rate is less than the expected input flow rate, the input difference is positive and gradually decreases. At this point, directly increasing the ventilation volume to the original first target flow rate can easily lead to the intake of excessive cold air. Correcting the first target flow rate using the above method ensures the speed of back-end ventilation volume control, preventing flue gas leakage. Furthermore, it allows for adjustment of the back-end ventilation volume based on changes in the actual current input flow rate at the front end, avoiding pressure mismatch between the front-end input and back-end ventilation, reducing the risk of flue gas pressure oscillations in the duct due to mismatch, lowering the risk of flue gas leakage, and ensuring flue gas treatment efficiency.

[0046] Similarly, when reducing the number of furnaces used in smelting, the ventilation volume can be controlled to change in advance to follow the changes in the input flow rate, thus ensuring the efficiency of flue gas treatment.

[0047] To further reduce the impact of oscillations, this embodiment also includes acquiring the oscillation characteristics of the first flow rate and adjusting the correction coefficient based on the oscillation characteristics to suppress the oscillations of the first flow rate, specifically including: When the oscillation characteristics meet the condition of high frequency and small amplitude, the correction coefficient is reduced according to the preset first rule. The condition of high frequency and small amplitude is, for example, a frequency > 0.5 Hz. When the system draws in too much cold air, the cold air mixes with the flue gas, causing a sudden change in the regional flue gas pressure. This alters the air leakage, and new flue gas is injected more quickly to fill the gap. The pressure recovers, and this process repeats, causing high-frequency oscillations in the flue gas pressure and flow rate. In this case, reducing the correction coefficient, decreasing the increase in ventilation volume, and reducing air leakage can mitigate the oscillation.

[0048] When the oscillation characteristics meet the large amplitude condition, the correction coefficient should be increased. For example, the large amplitude condition is an oscillation amplitude of 10%-30%. Excessive correction of the ventilation volume will lead to a large difference between the flue gas input and the ventilation volume, resulting in poor flue gas exhaust, large pressure fluctuations, and a high risk of flue gas leakage. In this case, increasing the ventilation volume can reduce the poor flue gas exhaust and reduce the pressure fluctuations.

[0049] The adjustment amount of the correction coefficient needs to be designed according to the characteristics of the actual system, and this application does not impose any special restrictions on it.

[0050] During the adjustment of the correction coefficient, the oscillation of the first flow rate is monitored in real time to verify the adjustment effect. When the adjustment effect meets the expectations (the oscillation frequency and amplitude are reduced to the preset acceptable range), the adjustment is paused and the correction coefficient is fixed at this time. The correction coefficient also has an adjustment range, for example, between 10% and 20%, with a single adjustment step of 1%. During adjustment, it is necessary to avoid adjusting outside the range.

[0051] In this example, the correction coefficient with the best adjustment effect was selected as the initial correction coefficient at startup based on the historical adjustment records. The oscillation frequency and fluctuation amplitude of the optimal adjustment effect were both within the normal range. Furthermore, the data was grouped according to different input differences, and the correction coefficient of the corresponding group was selected as the initial parameter by comparing the actual input difference with the recorded input difference.

[0052] When the adjustment coefficient is adjusted to its limit and the adjustment effect still does not meet expectations, historical data matching the current oscillation characteristics is selected from the historical database, and the best adjustment coefficient in the corresponding historical data is used as the adjustment coefficient. The adjustment is then repeated until the adjustment effect meets expectations.

[0053] The overall control objectives include the ventilation volume of the fan, the flue gas temperature in the pipeline, and the amount of adsorbent added. In an optional embodiment, real-time control parameters are obtained through an adaptive control model to perform adaptive control. The adaptive control model includes an input layer, an embedding layer, a bidirectional LSTM feature extraction layer, a multi-head attention enhancement layer, and a multi-task output layer.

[0054] The input dimensions of the input layer include the expected input flow rate, real-time input flow rate, and composition of the flue gas; the input-side flue gas temperature, output-side flue gas temperature, coolant temperature, coolant flow rate, and heat exchange efficiency of the spiral jacketed condenser; the amount of adsorbent added; the input-side flue gas flow rate, fluctuation amplitude, and fluctuation frequency of the adsorption module; and the real-time air leakage rate of the system. The output dimensions include the ventilation volume of the fan, the amount of adsorbent added, the coolant flow rate of the spiral jacketed condenser, and the dioxin removal rate.

[0055] The embedding layer is used to map the input-dimensional features of the input layer into a multi-dimensional dense vector. The activation function is, for example, LeakyReLU (α=0.01) to avoid gradient vanishing.

[0056] The bidirectional LSTM feature extraction layer adopts a 2-layer stacked structure, for example, the number of hidden units in each layer is 128, the forget gate bias is 0.1, the dropout rate is 0.3, the recurrent_dropout rate is 0.2, and it captures the "past-present-future" temporal dependency of flue gas parameters (time step = 30, that is, using the data of the first 30 seconds to predict the current control parameters).

[0057] The multi-head attention enhancement layer is used to increase the weight of key features such as flue gas composition, real-time air leakage rate, and dioxin removal rate.

[0058] The multi-task output layer outputs the fan's ventilation volume, the amount of adsorbent added, and the coolant flow rate of the spiral jacketed condenser through three fully connected sublayers. The number of neurons in each fully connected sublayer is gradually reduced from the dimension of the multidimensional dense vector to 1, and finally outputs the fan's ventilation volume, the amount of adsorbent added, and the coolant flow rate of the spiral jacketed condenser.

[0059] To improve the energy efficiency ratio, the removal rate of dioxins and system energy consumption data are also monitored as correction feedback signals for model self-learning. This controls the actual removal rate of dioxins to be within the expected range and adjusts the system energy consumption to improve the system energy efficiency ratio and increase efficiency.

[0060] To ensure the reliability of the model, the actual removal rate of dioxins is compared with the removal rate predicted by the model. If the deviation is greater than the preset value (e.g., 5%), the model is fine-tuned through self-learning (e.g., learning rate = 5e-6, training rounds = 5 rounds) to correct the output of control parameters. This ensures that the actual removal rate of dioxins can meet the expected target under the control of the fan ventilation volume, adsorbent input, and coolant flow rate of the spiral jacketed condenser as output by the model.

[0061] The method and system for treating recycled copper smelting flue gas provided by this invention obtains a first target flow rate by multiplying the total exhaust volume of the connected smelting furnace by a preset leakage rate. This first target flow rate is then superimposed with the total exhaust volume of the connected smelting furnace to obtain a final target flow rate. This target flow rate is used as the control target for the input flow rate of the adsorption module. The fan is adjusted according to the difference between the target flow rate and the first input flow rate until the first input flow rate reaches the target flow rate. This invention automatically adjusts the fan's ventilation volume to match the leakage rate by increasing the control target of the dust collection module's input flow rate based on the leakage rate. This effectively avoids the risk of the flue gas temperature dropping from the dioxin inhibition temperature to the dioxin resynthesis temperature range, and prevents the flue gas from escaping through leakage points, ensuring the overall reliability of flue gas treatment even when the input flue gas volume fluctuates significantly.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The embodiments described above are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for treating dioxin in copper smelting offgas, for treating dioxin in offgas, characterized by include: Cool the incoming flue gas; The cooled flue gas was subjected to adsorption treatment to obtain an adsorbent containing dioxins. The adsorbent containing dioxins is collected by the dust collection module, and the first flow rate at the input side of the dust collection module is collected. In addition, the expected input flow rate is obtained based on the furnace input information, and the first target flow rate is obtained based on the expected input flow rate and the preset air leakage rate; Adjust the ventilation volume of the fan on the output side of the dust collection module according to the first target flow rate so that the first flow rate reaches the first target flow rate.

2. The method for treating recycled copper smelting flue gas according to claim 1, characterized in that, Also includes: The actual input flow rate of the flue gas is collected, and when the actual input flow rate meets the preset steady-state conditions, a second target flow rate is obtained based on the actual input flow rate and the preset air leakage rate. The adjustment target of the first flow rate is modified to the second target flow rate, so as to adjust the ventilation volume of the fan on the output side of the dust collection module according to the second target flow rate, so that the first flow rate reaches the second target flow rate.

3. The method of claim 2, wherein the copper smelting flue gas is treated by, The steady-state conditions include: the slope of the actual input flow is less than or equal to a preset slope threshold, and the fluctuation amplitude within the current sampling period is less than or equal to a preset fluctuation range, wherein the sampled value of the actual input flow in the current sampling period is the average value within the current sampling period.

4. The method of claim 1, wherein the copper smelting flue gas is a copper smelting flue gas from a copper smelting process. Also includes: The input difference is obtained by comparing the expected input flow with the current input flow. The correction amount is obtained by multiplying the input difference with a preset correction coefficient. The correction amount is then added to the first target flow to update the first target flow.

5. The method of claim 4, wherein the copper smelting flue gas is treated by a method comprising: It also includes acquiring the oscillation characteristics of the first flow rate and adjusting the correction coefficient based on the oscillation characteristics to suppress the oscillation of the first flow rate, wherein... When the oscillation characteristics meet the high-frequency condition, the correction coefficient is reduced; When the oscillation characteristics meet the large amplitude condition, the correction coefficient is increased.

6. A copper smelting offgas treatment system for dioxin treatment in offgas, characterized by include: The system consists of a flue gas input module, a cooling module, an adsorption module, a dust collection module, and a flue gas exhaust module, connected sequentially, along with a main controller. The flue gas input module is provided with multiple input terminals in parallel to connect to the exhaust flue gas from multiple smelting furnaces in parallel. The dust collection module is equipped with a flow meter in its input pipeline and a fan in its output pipeline, which is connected to the smoke exhaust module. The main controller is used to regulate the ventilation volume of the fan according to any one of claims 1 to 5 of the method for treating flue gas from recycled copper smelting.

7. The copper smelting fume treatment system of claim 6, wherein, The gas distribution plate has a diamond-shaped opening with an opening ratio greater than 80%.

8. The recycled copper smelting flue gas treatment system according to claim 6, characterized in that, The cooling module includes a cooling fume hood and a spiral jacketed condenser arranged in sequence.

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