Aluminum smelting furnace flue gas treatment system and method based on medium and low temperature SCR denitration catalysis

Abstract

The invention discloses an aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitration catalysis, which comprises a flue gas treatment control unit and a flue gas treatment device, and the flue gas treatment device comprises a flue gas pretreatment unit, an adsorption dust removal unit, a bag type dust removal unit, a dry type deacidification unit, an SCR denitration unit, an alkali liquor spraying unit and a discharge unit which are sequentially connected through pipelines; the flue gas treatment control unit is in control connection with the flue gas treatment device to purify and discharge the flue gas of the aluminum smelting furnace; an activated carbon adsorption process model between input and output is established in the adsorption dust removal unit, and can predict and output the flue gas concentration at the outlet of the adsorption dust removal tower in real time according to the flue gas concentration at the inlet of the adsorption dust removal tower; the flue gas treatment control unit controls the carbon injection amount of an activated carbon injection device in the adsorption dust removal unit according to the predicted value of the flue gas concentration at the outlet of the adsorption dust removal tower, so that the flue gas treatment process is accurately controlled, and the flue gas is discharged by the discharge unit after being treated by subsequent equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum smelting furnace flue gas treatment, and in particular to an aluminum smelting furnace flue gas treatment system and method based on medium- and low-temperature SCR denitration catalysis. Background Art

[0002] Aluminum recycling in my country is primarily achieved through pyrometallurgy. The primary fuels used in the aluminum smelting process include coal, coke, heavy oil, diesel, and natural gas. The combustion of these fuels produces exhaust gases containing large amounts of soot and oxides of sulfur, carbon, phosphorus, and nitrogen. When aluminum alloy scrap is heated in the smelting furnace, the oil and combustibles contained in the waste and inclusions burn, producing large amounts of sulfur, carbon, and nitrogen oxides. During the smelting process, certain amounts of covering agents, refining agents, and degassing agents are added to minimize combustion losses, improve aluminum recovery rates, and ensure the quality of the aluminum alloy. These additives react with various impurities in the aluminum alloy melt, generating large amounts of exhaust gases and soot. These gases contain a variety of metal and non-metal oxides, as well as soot particles, which can pollute the environment.

[0003] Patent application number 201721694962.7 discloses a dry flue gas desulfurization and denitrification device, comprising a flue gas generation device, a pre-dust removal device, a flue gas desulfurization and denitrification device, a desulfurization and denitrification agent supply device, an oxidant liquid spray device, a dust removal device, a desulfurization and denitrification agent collector, and a chimney. The flue gas desulfurization and denitrification device comprises a flue section and a Venturi section, the flue section being located below the flue gas desulfurization and denitrification device, and the Venturi section being located above the flue section. The flue section is provided with a pre-dust removal flue gas inlet and a desulfurization and denitrification agent inlet; and an oxidant liquid spray port is provided on the upper sidewall of the Venturi section. The flue gas desulfurization and denitrification device of the above technical solution can ensure high desulfurization and denitrification efficiency.

[0004] Although the above technical solution achieves a relatively high desulfurization and denitrification efficiency, the flue gas components generated by the aluminum smelting furnace during long-term use are diverse. The existing technology often uses a treatment device with a relatively single function to treat the flue gas. However, since the components and content of harmful substances contained in recycled aluminum from different sources are difficult to determine, the above flue gas treatment method has poor versatility and has the defects of high energy consumption and waste of resources. Summary of the Invention

[0005] The purpose of the present invention is to provide an aluminum smelting furnace flue gas treatment system and method based on medium and low temperature SCR denitrification catalysis, which can efficiently purify the flue gas generated in the smelting process of recycled aluminum with different sources and different harmful components and contents, and has strong versatility and energy-saving effects.

[0006] The present invention adopts the following technical solutions:

[0007] The present invention solves the technical problem of limited application scope of traditional flue gas treatment devices by combining a pretreatment unit, an adsorption dust removal unit, a bag dust removal unit, a dry deacidification unit, an SCR denitrification unit, an alkali solution spray unit and an emission unit; solves the technical problem of insufficient activated carbon injection capacity during adsorption dust removal treatment by using an activated carbon injection device in the adsorption dust removal unit; solves the technical problem of insufficient gas fluidity and insufficient reaction time between activated carbon powder and flue gas during adsorption dust removal reaction by using an activated carbon dust removal tower in the adsorption dust removal unit; and solves the technical problem of accurately controlling the flue gas treatment process by controlling the carbon injection amount of the activated carbon injection device through an activated carbon adsorption process model.

[0008] The flue gas treatment system of the aluminum smelting furnace uses the activated carbon adsorption process model to obtain the predicted value of the flue gas concentration at the adsorption dust removal tower outlet. The activated carbon injection control method is used to control the injection amount of activated carbon powder in the activated carbon injection device. Specifically, it includes:

[0009] The data acquisition module is used to obtain the historical operating data of the activated carbon adsorption tower, determine the dependent variables and independent variables of the adsorption tower inlet flue gas concentration prediction model, and obtain the training data set;

[0010] The model building module is used to establish the adsorption tower inlet flue gas concentration prediction model and the activated carbon adsorption process model; the function calculation module is used to establish the activated carbon adsorption process loss function and use the differential evolution algorithm to solve the optimal solution of the loss function;

[0011] The carbon injection amount prediction module is used to predict the flue gas concentration at the inlet of the activated carbon adsorption tower according to the current operating status of the activated carbon adsorption tower through the flue gas concentration prediction model at the inlet of the adsorption tower, and to predict the flue gas concentration at the outlet of the reactor adsorption tower through the activated carbon adsorption process model, thereby controlling the carbon injection amount of the activated carbon adsorption tower.

[0012] Compared with the existing technology, the present invention has the following beneficial technical effects:

[0013] Based on the historical operating data of the activated carbon adsorption tower, the present invention uses a gated recurrent neural network that can better capture the dependency relationship with a large time distance in the time series to predict the smoke concentration at the adsorption tower entrance, thereby achieving scientific control of the carbon injection amount of the activated carbon adsorption tower, and effectively solving the control lag problem caused by insufficient consideration of the time dimension in the existing method. The present invention comprehensively considers the aluminum smelting furnace load s, the tower temperature T, the activated carbon injection amount Q c , activated carbon residence time t and adsorption tower inlet dust concentration C iThese indicators that can determine the efficiency of the adsorption reaction are used to achieve a dynamic response to the load during the adsorption reaction by establishing an adsorption efficiency function. The present invention also establishes an activated carbon adsorption process model in combination with the adsorption efficiency function, and uses a differential evolution algorithm to perform global optimization on the reaction model to determine the adsorption reaction model parameters. The carbon injection amount is predicted based on the reaction model, so that the concentration of smoke at the outlet of the activated carbon adsorption tower meets the control target requirements, thereby solving the problem of precise control of the carbon injection amount during the activated carbon adsorption reaction.

[0014] Furthermore, the present invention adopts a differential evolution algorithm to solve the optimal solution of the loss function. Through continuous evolution, excellent individuals are retained, inferior individuals are eliminated, and the search is guided to approach the optimal solution, so that the established activated carbon adsorption process model can predict the smoke concentration at the outlet of the activated carbon adsorption tower with higher accuracy.

[0015] 1. The present invention is provided with a flue gas treatment control unit, a flue gas pretreatment unit, an adsorption dust removal unit, a bag dust removal unit, a dry deacidification unit, an SCR denitrification unit, an alkali liquid spraying unit and an emission unit; the flue gas treatment control unit controls the connected flue gas treatment device, and the flue gas treatment control unit controls the flue gas pretreatment unit, the adsorption dust removal unit, the bag dust removal unit, the dry deacidification unit, the SCR denitrification unit, the alkali liquid spraying unit and the emission unit to purify and discharge the flue gas from the aluminum smelting furnace.

[0016] 2. The present invention sets a driving motor, a rope drum, a reverse driving rope, a forward driving rope, and reverse starting of the driving motor to drive the rope drum to rotate in the reverse direction to tighten and pull the reverse driving rope to drive the first slider and the second slider to slide to the left, and the third slider and the fourth slider to slide to the right, and at the same time releases the forward driving rope to avoid hindering the sliding of the first slider, the second slider, the third slider and the fourth slider, thereby ensuring that the blades rotate smoothly counterclockwise, and the driving motor drives the rope drum to rotate forward and then drives the blades to rotate clockwise. By adjusting the angle of the blades, the flue gas in the adsorption dust removal tower can generate turbulent and eddy states when rising. In the turbulent state, the rising speed of the flue gas is slower, and the flue gas in the adsorption dust removal tower can be fully dusted; in the eddy state, the rising speed of the flue gas is faster than the rising speed in the turbulent state, which is suitable for working conditions with low dust content in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the flue gas treatment of the aluminum smelting furnace in the present invention;

[0018] Figure 2 Schematic diagram of the structure of the aluminum smelting flue gas treatment control system in the present invention;

[0019] Figure 3 Schematic diagram of the method for precise carbon injection of the activated carbon injection device in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the activated carbon injection device and its connection with the activated carbon adsorption tower in the present invention;

[0021] Figure 5 Schematic diagram of the initial state of the adsorption tower layout and eddy turbulence generating unit in the present invention;

[0022] Figure 6 This is a schematic diagram of the installation position of a single eddy turbulence generating unit in the present invention;

[0023] Figure 7 For the present invention Figure 6 A magnified view of middle A;

[0024] Figure 8 For the present invention Figure 6 Enlarged view of middle B;

[0025] Figure 9 This is the rope drive wiring method for the blade side transmission sub-unit of the eddy current turbulence generating unit in the present invention;

[0026] Figure 10 This is the rope drive wiring method for the blade side transmission sub-unit of the eddy current turbulence generating unit in the present invention;

[0027] Figure 11 Schematic diagram of the posture of the blade in the vortex generation state in the present invention;

[0028] Figure 12 Schematic diagram of the posture of the blade in the turbulent state of the present invention;

[0029] Figure 13 Schematic diagram of the flue gas treatment system of the aluminum smelting furnace in the present invention.

[0030] In the figure, 1, tower wall; 3, vortex turbulence generating unit; 31, blade; 32, blade center transmission subunit; 33, blade side transmission subunit; 34, blade angle drive device; 321, center horizontal shaft; 322, center horizontal shaft bearing; 323, center horizontal shaft support plate; 324, center vertical shaft; 325, short shaft bearing; 326, center support frame; 332, arc support plate; 333, arc guide rail; 334, arc slider; 335 , side shaft support frame; 336, side vertical shaft; 341, drive motor; 342, reducer; 343, rope drum; 344, rope group; 3441, clockwise drive rope; 3443, counterclockwise drive rope; 3342, first slider; 3341, second slider; 344411, upper branch rope; 344412, upper branch rope; 344421, lower branch rope; 344422, lower branch rope; 5411, guide column; 5412, guide Column; 5311, guide column; 5312, guide column; 344211, upper branch rope; 344212, upper branch rope; 344221, lower branch rope; 344222, lower branch rope; 6, main pipeline assembly; 7, first bypass pipeline assembly; 8, second bypass pipeline assembly; 9, third bypass pipeline assembly; 11, center through hole; 12, annular through hole; 51, upper main column; 52, lower main column; 61, induced draft fan; 62, first pressure gauge; 63, first A stop valve; 64, an ejector; 65, a second stop valve; 66, a second pressure gauge; 641, a contraction tube; 642, a diffusion tube; 71, a first bypass inlet stop valve; 72, a carbon storage bin; 73, a first bypass outlet stop valve; 641, a contraction tube; 642, a diffusion tube; 81, a pressure regulating valve; 91, a booster; 92, a one-way valve; 224, an activated carbon injection port; 331, a side horizontal rotating shaft; 3343, a third slider; 3344, a fourth slider. DETAILED DESCRIPTION

[0031] See also Figure 1-13 The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

[0032] The flue gas treatment system for an aluminum smelting furnace based on medium- and low-temperature SCR denitrification catalysis described in the present invention includes a flue gas treatment control unit and a flue gas treatment device. The flue gas treatment device includes a flue gas pretreatment unit, an adsorption dust removal unit, a bag dust removal unit, a dry deacidification unit, an SCR denitrification unit, an alkali solution spray unit and an emission unit connected in sequence through pipelines; the flue gas treatment control unit controls the connection of the flue gas treatment device.

[0033] The present invention controls the flue gas pretreatment unit, adsorption dust removal unit, bag dust removal unit, dry deacidification unit, SCR denitrification unit, alkali solution spraying unit and emission unit through the flue gas treatment control unit, and purifies the flue gas of the aluminum smelting furnace before emission.

[0034] The present invention establishes an activated carbon adsorption process model between the input and output of the adsorption dust removal unit. The activated carbon adsorption process model can predict the flue gas concentration at the adsorption dust removal tower inlet and output the flue gas concentration at the adsorption dust removal tower outlet in real time.

[0035] In the present invention, the flue gas treatment control unit accurately controls the flue gas treatment process by controlling the carbon injection amount of the activated carbon injection device in the adsorption dust removal unit based on the predicted value of the flue gas concentration at the outlet of the adsorption dust removal tower output in real time by the activated carbon adsorption process model, and then discharges the flue gas through the emission unit after being processed by subsequent equipment.

[0036] In this embodiment, the flue gas pretreatment unit includes a multi-tube cooler, a cyclone dust collector, and a gravity dust collector, all connected in sequence. The inlet of the multi-tube cooler is connected to the flue gas outlet of the aluminum smelting furnace via a pipeline, and various forms of heat exchange are used to achieve rapid cooling of the high-temperature flue gas. The cyclone dust collector uses high-speed rotating airflow to draw dust particles from the gas into the dust collector, where they are subjected to centrifugal force and separated from the gas. The gravity dust collector uses gravity to deposit fine particles in the airflow into a static settling chamber within the dust collector, thereby achieving dust removal.

[0037] The flue gas pretreatment unit is a conventional technology in this field and will not be described in detail here.

[0038] In the present invention, the adsorption dust removal unit comprises an activated carbon injection device, an adsorption dust removal tower, and a dust treatment device connected by a pipeline. The activated carbon injection device sprays activated carbon powder into the adsorption dust removal tower. The activated carbon powder adsorbs the flue gas in the adsorption dust removal tower, and the resulting dust is collected by the dust treatment device and discharged. The dust treatment device is conventional in the art and will not be described in detail here.

[0039] In this embodiment, the activated carbon injection device includes a main pipeline assembly 6, a first bypass pipeline assembly 7, a second bypass pipeline assembly 8 and a third bypass pipeline assembly 9 connected by pipelines; the main pipeline assembly 6 injects the activated carbon powder into the adsorption dust removal tower to participate in the adsorption effect, the first bypass pipeline assembly 7 continuously supplies activated carbon powder, and the second bypass pipeline assembly 8 adjusts the injection amount of the activated carbon powder of the main pipeline assembly 6; the third bypass pipeline assembly 9 provides a backup pressure source for the main pipeline assembly 6.

[0040] In this embodiment, the main pipeline assembly 6 consists of an induced draft fan 61, a first pressure gauge 62, a first main stop valve 63, an ejector 64, a second main stop valve 65, and a second pressure gauge 66, all interconnected in sequence via a main pipeline. The induced draft fan 61 connects the front end of the main pipeline assembly 6 to the furnace mouth and the flue gas diversion pipeline within the furnace, thereby introducing flue gas generated during the aluminum smelting process. The main pipeline extending from the second pressure gauge 66 at the end of the main pipeline assembly 6 connects to the adsorption dust removal tower. The induced draft fan 61 provides a continuous and stable air source to the main pipeline, while the first and second pressure gauges 62 and 66 measure the pressure difference across the ejector 64. The first and second main stop valves 63 and 65 control the flow of the main pipeline. The ejector 64 injects activated carbon powder into the adsorption dust removal tower for adsorption. The ejector 64 includes a contraction tube 641 and a diffusion tube 642. The positive pressure airflow generated by the induced draft fan 61 generates suction when it passes through the contraction tube 641, sucking away the activated carbon powder above the contraction tube 641. The activated carbon powder passes through the diffusion tube 642 and is ejected.

[0041] In this embodiment, the first bypass pipe assembly 7 includes a first bypass inlet stop valve 71, a carbon storage bin 72, and a first bypass outlet stop valve 73, which are sequentially connected by the first bypass pipe. One side of the first bypass inlet stop valve 71 is connected to the output end of the induced draft fan 61, and the other side is connected to the air inlet of the carbon storage bin 72. One side of the first bypass outlet stop valve 73 is connected to the discharge port of the carbon storage bin 72, and the other side is connected to the sidewall of the contraction tube 641 of the ejector 64. The induced draft fan 61 continuously provides positive pressure to the first bypass pipe assembly 7, ensuring that the activated carbon powder in the carbon storage bin 72 is continuously supplied from the outlet of the first bypass outlet stop valve 73 to the contraction tube 641.

[0042] In this embodiment, the second bypass pipe assembly 8 is formed by a pressure-regulating valve 81 connected by a pipe. One end of the pressure-regulating valve 81 is connected to the inlet of the first shut-off valve 63, and the other end of the pressure-regulating valve 81 is connected to the outlet of the second shut-off valve 65. By varying the opening of the pressure-regulating valve 81, the pressure difference across the injector 64 in the main pipe assembly 6 is adjusted, thereby varying the amount of activated carbon powder injected.

[0043] In this embodiment, the third bypass pipe assembly 9 includes a supercharger 91 and a one-way valve 92 connected by a pipeline. The inlet of the one-way valve 92 is connected to the supercharger 91, and the outlet of the one-way valve 92 is connected to the main pipeline between the first bypass inlet stop valve 71 and the first pressure gauge 62. The third bypass pipe assembly 9 provides a backup pressure source for the main pipe assembly 6.

[0044] In this embodiment, a plurality of activated carbon injection devices may be used, and the plurality of activated carbon injection devices are evenly arranged along the bottom of the outer side surface of the tower wall 1 .

[0045] In the present invention, the adsorption dust removal tower includes a tower wall 1, a vortex turbulence generating assembly is provided on the upper portion of the tower wall 1, and an activated carbon injection port 224 is provided on the lower portion of the tower wall 1; the tower wall 1 of the adsorption dust removal tower is cylindrical, and a central through hole 11 and an annular through hole 12 are opened on the side of the tower wall 1; the vortex turbulence generating assembly includes a plurality of vortex turbulence generating units 3, and the vortex turbulence generating units 3 are evenly arranged along the circumferential direction of the upper portion of the tower wall 1;

[0046] In the present invention, the vortex turbulence generating unit 3 includes a blade 31 movably arranged on the inner side of the tower wall 1. The middle part of the outer side of the blade 31 is rotatably connected to the blade center transmission subunit 32. The outer ends of the blade 31 are respectively rotatably connected to the corresponding blade side transmission subunits 33. The blade side transmission subunits 33 are connected to the blade angle driving device 34 through a driving rope.

[0047] In the present invention, the blade center transmission subunit 32, the blade side transmission subunit 33 and the blade rotation angle driving device 34 are all arranged outside the tower wall 1;

[0048] Preferably, there are multiple blades 31 , and the main body is in a regular plate shape and is evenly distributed on the inner side of the tower wall 1 .

[0049] In this embodiment, the blade center transmission subunit 32 is arranged on the outside of the tower wall 1, and the blade center transmission subunit 32 includes a sleeved central parallel shaft 321, a central parallel shaft bearing 322 and a central parallel shaft support plate 323; the blade center transmission subunit 32 also includes a central vertical shaft 324, a short shaft bearing 325 and a central support frame 326 that are sleeved in sequence, and the central parallel shaft 321 is horizontally penetrated on the tower wall 1 of the adsorption dust removal tower, one end of the central parallel shaft 321 is fixedly connected to the middle part of the outer side surface of the blade 31 in the adsorption dust removal tower, and the other end of the central parallel shaft 321 is fixedly connected to the inner ring of the central parallel shaft bearing 322, and the central parallel shaft shaft The outer ring of the bearing 322 is fixed on the central parallelepiped shaft support plate 323, and the central parallelepiped shaft support plate 323 is fixedly connected to the outer ring of the central parallelepiped shaft bearing 322; the central parallelepiped shaft support plate 323 is a regular rectangular parallelepiped, and the central vertical shaft 324 is fixedly provided on both side end faces along its vertical direction, and the axis of the central vertical shaft 324 is arranged in a perpendicular direction to the axis of the central parallelepiped shaft 321, and the central vertical shaft 324 is fixedly connected to the inner ring of the short shaft bearing 325, and the bearing seat of the short shaft bearing 325 is fixedly connected to the central support frame 326, and the central support frame 326 is rotatably connected to the tower wall 1; the blade 31 can rotate around the central parallelepiped shaft 321.

[0050] In this embodiment, the blade side transmission sub-units 33 are arranged in pairs symmetrically along the axis of the central horizontal axis 321, and can drive the blades 31 to rotate around the central horizontal axis 321 on both sides;

[0051] Specifically, the blade side transmission subunit 33 includes an arc-shaped support plate 332, the inner side of the arc-shaped support plate 332 is fixedly connected to the tower wall 1 around the annular through hole 12, the outer side of the arc-shaped support plate 332 is flat and fixedly connected to the arc guide rail 333, the arc guide rail 333 is slidably connected to the side shaft support frame 335 through the arc slider 334, and the side shaft support frame 335 is in a "U" shape as a whole. In the initial state, the opening direction of the side shaft support frame 335 is facing the tower wall 1 and is horizontally arranged. The arc guide rail 333 is arranged in parallel in the vertical direction into two upper and lower parts, and the two arc guide rails 333 cooperate with the corresponding arc slider 334; The upper and lower end surfaces of the shaft support frame 335 are rotatably connected to the side vertical rotating shaft 336. In the initial state, the side vertical rotating shaft 336 is arranged in the vertical direction. A side horizontal rotating shaft frame is arranged inside the side shaft support frame 335. The side horizontal rotating shaft frame is rotatably connected to the side shaft support frame 335 through the upper and lower side vertical rotating shafts 336; the side horizontal rotating shaft frame is horizontally rotatably connected to the side horizontal rotating shaft 331; the axis of the side horizontal rotating shaft 331 and the side vertical rotating shaft 336 are perpendicular to each other, and the side horizontal rotating shaft 331 can freely pass through the annular through hole 12. The inner end of the side horizontal rotating shaft 331 is rotatably connected to the outer end of the blade 31 around its axis;

[0052] Specifically, the central vertical shaft 324 and the side vertical rotating shaft 336 are always coaxial, thereby ensuring that the blade side transmission subunits 33 arranged in pairs above and below realize the rotation of the blade 31 around the axis of the side vertical rotating shaft 336 through the side vertical rotating shaft 336.

[0053] In this embodiment, the blade 31 is supported by the central horizontal shaft 321 and driven by the side horizontal rotating shaft 331 to rotate around the axis of the central horizontal shaft 321;

[0054] In this embodiment, the blade 31 is supported by the central vertical shaft 324 and the side vertical rotation shafts 336 and is able to rotate around the axis of the central vertical shaft 324;

[0055] In this embodiment, the central through hole 11 and the annular through hole 12 provided in the tower wall 1 of the adsorption dust removal tower are sized to accommodate the movement of the central horizontal shaft 321 and the side horizontal rotating shaft 331, respectively. A soft sealing sleeve is attached between the side wall of the central through hole 11 and the cylindrical surface of the central horizontal shaft 321, and an arc-shaped telescopic sealing cover that can move with the side vertical rotating shaft 336 is provided between the side wall of the annular through hole 12 and the cylindrical surface of the side horizontal rotating shaft 331. The soft sealing sleeve and the arc-shaped telescopic sealing cover can ensure the sealing of the tower wall 1 while adapting to the movement of the central horizontal shaft 321 and the side horizontal rotating shaft 331. The soft sealing sleeve and the arc-shaped telescopic sealing cover are conventional technologies in this field and will not be described in detail here.

[0056] In this embodiment, the blade angle driving device 34 includes a driving motor 341 fixed to the lower outer portion of the tower wall 1, a reducer 342 and a rope drum 343 connected in sequence by an output shaft. The forward and reverse rotation of the driving motor 341 and the reducer 342 converts electrical energy into mechanical energy, driving the rope drum 343 to rotate back and forth.

[0057] In this embodiment, the blade angle driving device 34 further includes a sliding rope assembly 344. The upper portion of the sliding rope assembly 344 is connected to the blade side transmission subunit 33, and the lower portion of the sliding rope assembly 344 is connected to the rope retracting drum 343. The sliding rope assembly 344 includes a clockwise driving rope 3441 and a counterclockwise driving rope 3443. The reciprocating rotation of the rope retracting drum 343 realizes the retraction and extension of the clockwise driving rope 3441 and the counterclockwise driving rope 3443, thereby pulling the blade 31 to rotate.

[0058] In this embodiment, the arc-shaped sliders 334 corresponding to the two blade side transmission sub-units 33 arranged in pairs are, from top to bottom in the vertical direction, a first slider 3342, a second slider 3341, a third slider 3343 and a fourth slider 3344;

[0059] Specifically, the lower part of the reversing driving rope 3443 is wound around the rope-collecting drum 343 in the forward direction, and the upper end of the reversing driving rope 3443 is connected to the left ends of the first slider 3342 and the second slider 3341 respectively through the upper branch ropes 344411 and 344412, and the upper end of the reversing driving rope 3443 is connected to the right ends of the third slider and the fourth slider respectively through the lower branch ropes 344421 and 344422; guide posts 5411, 5412, 5311 and 5312 are respectively provided on the left sides of the first slider 3342 and the second slider 3341 and on the right sides of the third slider and the fourth slider. When the reversing driving rope 3443 moves downward, the reversing driving rope 3443 synchronously drives the first slider 3342 and the second slider 3341 to move to the left, and synchronously drives the third slider and the fourth slider to move to the right;

[0060] Specifically, the lower portion of the clockwise driving rope 3441 is reversely wound around the rope-collecting drum 343, and the upper end of the clockwise driving rope 3441 passes through the upper branch ropes 344211 and 344212 to connect the first slider 3342 and the right end of the second slider 3341 respectively. The upper end of the clockwise driving rope 3441 passes through the lower branch ropes 344221 and 344222 to connect the left ends of the third slider and the fourth slider respectively. The right sides of the first slider 3342 and the second slider 3341 are connected to the left ends of the third slider and the fourth slider respectively. Guide columns 5411, 5412, 5311, and 5312 are respectively provided on the left sides of the third slider and the fourth slider. When the clockwise driving rope 3441 moves downward, the clockwise driving rope 3441 synchronously drives the first slider 3342 and the second slider 3341 to move to the right through the upper division ropes 344211, 344212 and the lower division ropes 344221, 344222 and the corresponding guide columns, and synchronously drives the third slider and the fourth slider to move to the left.

[0061] In this embodiment, the upper main column 51 is fixedly arranged on the lower left side of the upper blade side transmission subunit 33, and the lower main column 52 is fixedly arranged on the lower left side of the lower blade side transmission subunit 33. The branch ropes pass around the upper main column 51 and the lower main column 52 and converge to connect to the reverse driving rope 3443 and the forward driving rope 3441.

[0062] Specifically, the driving motor 341 is started to drive the rope drum 343 to rotate forward, tighten, and pull the clockwise driving rope 3441 to drive the first slider 3342 and the second slider 3341 to slide rightward, and the third slider and the fourth slider to slide leftward, while releasing the counter-rotating driving rope 3443 to avoid hindering the sliding of the first slider 3342, the second slider 3341, the third slider, and the fourth slider, thereby ensuring that the blade 31 rotates smoothly clockwise.

[0063] Specifically, the drive motor 341 is started in reverse to drive the rope-receiving drum 343 to rotate in reverse to tighten and pull the reverse drive rope 3443 to drive the first slider 3342 and the second slider 3341 to slide to the left, and the third slider and the fourth slider to slide to the right, and at the same time release the forward drive rope 3441 to avoid hindering the sliding of the first slider 3342, the second slider 3341, the third slider and the fourth slider, thereby ensuring that the blade 31 rotates counterclockwise smoothly.

[0064] In this embodiment, the blades 31 in the vortex turbulence generating units 3 are initially coplanar with the axis of the activated carbon adsorption tower.

[0065] When the adsorption dust removal tower starts adsorption operation, the blade 31 rotates under the driving action of the blade angle driving device 34. The blade 31 rotates to Figure 12Specifically, the adjacent blades 31 are driven by the corresponding blade angle driving device 34 to rotate, and the corresponding sliding rope group 344 drives the corresponding blade side transmission sub-unit 33 to move, thereby driving the adjacent blades 31 to rotate in the opposite direction, and finally achieving Figure 12 The turbulent state shown then stops;

[0066] When the adsorption dust removal tower starts releasing, the blade 31 rotates under the driving action of the blade rotation angle driving device 34. The blade 31 rotates to Figure 11 Specifically, the adjacent blades 31 are driven by the corresponding blade angle driving device 34 to rotate, and the corresponding sliding rope group 344 drives the corresponding blade side transmission sub-unit 33 to move, thereby driving the adjacent blades 31 to rotate in the same direction, and finally achieving Figure 11 The vortex state shown then stops.

[0067] By adjusting the angle of the blade 31, the flue gas in the adsorption dust removal tower can produce turbulent state and eddy state when rising. In the turbulent state, the rising speed of the flue gas is slow, and the flue gas in the adsorption dust removal tower can be fully dusted; in the eddy state, the rising speed of the flue gas is faster than the rising speed in the turbulent state, which is suitable for working conditions with low dust content in the flue gas.

[0068] In the present invention, a first flue gas concentration detection device is further provided at the inlet of the adsorption dust removal tower, which is used to determine the real-time concentration of the flue gas at the inlet of the adsorption dust removal tower.

[0069] In the present invention, the bag filter unit comprises a low-pressure pulse bag filter and a fly ash treatment device connected by a pipeline. The low-pressure pulse bag filter removes dust and particulate matter generated during the production process, while the fly ash generated is collected and discharged by the fly ash treatment device. Bag filter units are conventional in the art and will not be described in detail here.

[0070] In the present invention, the dry deacidification unit achieves the deacidification effect through the reaction between the desulfurizer and the gas under the control of the flue gas treatment control unit. The dry deacidification unit belongs to the conventional technology in this field and will not be described in detail here.

[0071] In the present invention, the SCR denitrification unit is a device for catalyzing the reaction of NOx with a reducing agent under the control of the flue gas treatment control unit, which can convert NOx into harmless nitrogen and water, thereby achieving the effect of purifying the exhaust gas. The SCR denitrification unit belongs to the conventional technology in this field and will not be described in detail here.

[0072] In the present invention, the alkali spray unit includes an alkali spray tower, a sedimentation tank, a circulating water tank, and a circulating water pump, which are sequentially connected by pipelines. Liquid flowing out of the alkali spray tower is allowed to settle in the sedimentation tank before entering the circulating water tank. The liquid in the circulating water tank reacts with a double alkali (sodium hydroxide and sodium carbonate) injected into the circulating water tank from the outside to form process water. The circulating water pump then pumps the process water through pipelines into the alkali spray tower for secondary use. The alkali spray unit is conventional in the art and will not be described in detail here.

[0073] In the present invention, the emission unit adopts an emission chimney, and a second flue gas concentration detection device is provided in the flue of the emission chimney to confirm again that the final gas meets the emission standard.

[0074] In the present invention, the flue gas treatment control unit is electrically connected to the flue gas pretreatment unit, the adsorption dust removal unit, the bag dust removal unit, the dry deacidification unit, the SCR denitrification unit, the alkali solution spraying unit and the emission unit;

[0075] The present invention provides a method for treating flue gas from an aluminum smelting furnace based on medium- and low-temperature SCR denitration catalysis, comprising the following steps:

[0076] S1, the flue gas treatment control unit controls the induced draft fan to guide the high-calorie flue gas discharged from the exhaust port of the smelting furnace into the waste heat boiler for waste heat recovery treatment;

[0077] S2. The flue gas treatment control unit determines the real-time flue gas concentration at the inlet of the adsorption dust removal tower through the first flue gas concentration detection device, and then uses the real-time flue gas concentration at the inlet as the input of the activated carbon adsorption process model to ultimately predict the flue gas concentration at the outlet of the adsorption dust removal tower;

[0078] S3. The flue gas treatment control unit uses the adsorption dust removal treatment control strategy to control the pressure regulating valve 81 to adjust the activated carbon injection amount in real time to obtain optimal control of the adsorption dust removal tower;

[0079] S4. When the detection value of the first flue gas concentration detection device is too large and the activated carbon injection amount is greater than a set first threshold value, the flue gas treatment control unit controls the rotation of the drive motor 341 to swing the blade 31 to a turbulent state, thereby increasing the time for the activated carbon adsorption reaction to achieve sufficient reaction between the activated carbon particles and the flue gas. When the detection value of the first flue gas concentration detection device is lower than a set second threshold value, the flue gas treatment control unit controls the rotation of the drive motor 341 to swing the blade 31 to a vortex state to accelerate the adsorbed flue gas to enter the bag filter unit.

[0080] Furthermore, the flue gas treatment control unit controls the induced draft fan to guide the pre-treated flue gas into the adsorption dust removal tower for dust removal, and then discharges the dust in the adsorption dust removal tower into the dust collection box, and then transports the powder in the dust collection box through the conveying device;

[0081] S5. The flue gas treatment control unit sequentially controls the bag dust removal unit, dry deacidification unit, SCR denitrification unit, and alkali solution spraying unit to achieve further dust removal, deacidification, and denitrification treatment of the flue gas, and finally discharges the gas that meets the emission standards into the atmosphere through the emission unit.

[0082] The present invention collects historical operation data of the adsorption dust removal unit, determines the independent variables and dependent variables of the activated carbon adsorption process model, and then obtains the activated carbon adsorption process model by establishing the adsorption process loss function;

[0083] Specifically, the activated carbon adsorption process model includes the following steps:

[0084] S21. The independent variables of the model include: aluminum smelting furnace load s (t / h), tower temperature T (K), activated carbon injection amount Q c (kg / h), activated carbon residence time t(s), adsorption tower inlet dust concentration C i (mg / m 3 ), the dependent variable is the dust concentration at the adsorption tower outlet C o (mg / m 3 ).

[0085] S22. The specific process of establishing the activated carbon adsorption process model is as follows:

[0086] The loss function is established through the independent variables and dependent variables of the activated carbon adsorption process model, and the expression is:

[0087]

[0088] Where: ε i is the random error term that obeys the standard normal distribution (mg / m 3 ), k1 is the activated carbon adsorption capacity coefficient (mg / (kg·m 3 )), k2 is the smoke diffusion rate coefficient (m 3 / s),Q g is the flue gas flow rate (m 3 / h), i=1,2,…, N represents the time; e represents the load s (t / h) of the aluminum smelting furnace, the temperature in the tower T, the amount of activated carbon injected Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i The adsorption reaction efficiency is determined by the following formula:

[0089]

[0090] Where: s m is the load reference value of aluminum smelting furnace, T m is the reference temperature in the tower, Q c,mis the basic injection amount of activated carbon, t m is the activated carbon residence time, C i,m is the reference dust concentration at the entrance of the adsorption tower, α, β, γ, δ and ζ are respectively the aluminum smelting furnace load s, the tower temperature T, the activated carbon injection amount Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i Contribution of adsorption reaction efficiency;

[0091] S23. Use the differential evolution algorithm to solve the parameters in the loss function, and establish an activated carbon adsorption process model by optimizing the parameters of the results. The expression of the activated carbon adsorption process model is:

[0092]

[0093] Where: C0 is the dependent variable of the activated carbon adsorption process model, and k1>0, k2>0;

[0094] In the present invention, the activated carbon injection control method comprises the following steps:

[0095] S31. Obtain the data of the current operating status of the aluminum smelting furnace, including the aluminum smelting furnace load, adsorption tower blast volume, flue gas oxygen content and adsorption tower inlet pressure, and normalize them to form the prediction independent variable X1; use the adsorption tower inlet flue gas concentration regression model to predict the activated carbon adsorption tower inlet flue gas concentration C i , whose expression is:

[0096]

[0097] S32. The specific process of the activated carbon adsorption process model to predict the flue gas concentration at the adsorption tower outlet is as follows: i , using the current activated carbon injection amount Q c and activated carbon residence time t, the activated carbon adsorption process model is used to predict the dust concentration C at the outlet of the activated carbon adsorption tower o , whose expression is:

[0098] C o =f(s,T,Q c ,t,C i )

[0099] S33, the specific process of the activated carbon injection amount control method is:

[0100] Control target C through activated carbon adsorption tower outlet o , the control index is η, if the predicted value C o If the following conditions are met, the current carbon injection amount is the recommended value:

[0101]

[0102] If η≥η o , then maintain the current Q c unchanged; η o is the set control indicator threshold;

[0103] If η<η o , then adjust Q by gradient descent method c :

[0104]

[0105] in, Represents Q c The adjusted value after adjustment, λ is the model learning rate, η is the purification efficiency of the treatment project or purification equipment; C i The concentration of inlet dust of the treatment project or purification equipment, respectively, in mg / m 3 .

[0106] If not satisfied, adjust and update Q with a fixed step size c , repeated activated carbon adsorption process model predicts the dust concentration C at the outlet of the activated carbon adsorption tower o , and repeat the process of predicting the flue gas concentration at the inlet of the activated carbon adsorption tower by the regression model of the flue gas concentration at the inlet of the adsorption tower until the conditions are met.

[0107] Compared with the existing technology, the present invention has the following beneficial technical effects: The purpose of the present invention is to provide an aluminum smelting furnace flue gas treatment system and method based on medium and low temperature SCR denitrification catalysis, based on the historical operation data of the activated carbon adsorption tower, using a gated recurrent neural network that can better capture the dependency relationship with a large time distance in the time series to predict the smoke concentration at the adsorption tower inlet, and solve the problem of prediction lag caused by insufficient consideration of the time dimension in the existing method; the comprehensive aluminum smelting furnace load s, tower temperature T, activated carbon injection amount Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i The adsorption efficiency function is established based on the indicators of adsorption reaction efficiency that can be determined, so as to realize the dynamic response of the adsorption reaction process to the load;

[0108] An activated carbon adsorption process model is established in combination with the adsorption efficiency function, and the differential evolution algorithm is used to perform global optimization of the reaction model to determine the adsorption reaction model parameters. Based on the model prediction value, the carbon injection amount that can make the smoke concentration at the outlet of the activated carbon adsorption tower reach the control target requirement is achieved, fundamentally solving the problem of precise control of the carbon injection amount during the activated carbon adsorption reaction process.

Claims

1. Aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis, characterized by: It includes an aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis, which is characterized by: comprising a flue gas treatment control unit and a flue gas treatment device, the flue gas treatment device including a flue gas pretreatment unit, an adsorption dust removal unit, a bag dust removal unit, a dry deacidification unit, an SCR denitrification unit, an alkali liquid spraying unit and an emission unit connected in sequence through pipelines; the flue gas treatment control unit controls the connected flue gas treatment device, and the flue gas treatment control unit controls the flue gas pretreatment unit, the adsorption dust removal unit, the bag dust removal unit, the dry deacidification unit, the SCR denitrification unit, the alkali liquid spraying unit and the emission unit to purify the flue gas from the aluminum smelting furnace Treatment and emission; the adsorption dust removal unit includes an activated carbon injection device, an adsorption dust removal tower and a dust treatment device. The adsorption dust removal unit establishes an activated carbon adsorption process model between input and output. The activated carbon adsorption process model can predict the flue gas concentration at the adsorption dust removal tower inlet and output the flue gas concentration at the adsorption dust removal tower outlet in real time; the flue gas treatment control unit controls the carbon injection amount of the activated carbon injection device in the adsorption dust removal unit through the activated carbon injection control method according to the predicted value of the flue gas concentration at the adsorption dust removal tower outlet, thereby accurately controlling the flue gas treatment process, and then discharges it by the emission unit after subsequent equipment treatment.

2. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 1 is characterized by: The adsorption dust removal tower includes a tower wall, a vortex turbulence generating assembly is provided on the upper part of the tower wall, and an activated carbon injection port is provided on the lower part of the tower wall; the tower wall of the adsorption dust removal tower is cylindrical, and a central through hole and an annular through hole are opened on the side of the tower wall; the vortex turbulence generating assembly includes a plurality of vortex turbulence generating units, and the plurality of vortex turbulence generating units are evenly arranged along the circumferential direction of the upper part of the tower wall.

3. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 2 is characterized by: The vortex turbulence generating unit includes a blade movably arranged on the inner side of the tower wall, the middle part of the outer side of the blade is rotatably connected to the blade center transmission subunit, and the two ends of the outer side of the blade are respectively rotatably connected to the corresponding blade side transmission subunits, and the blade side transmission subunit is connected to the blade angle driving device through a driving rope; the blade center transmission subunit, the blade side transmission subunit and the blade angle driving device are all arranged on the outer side of the tower wall.

4. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 3 is characterized by: The blade center transmission sub-unit includes a sleeved center parallel shaft, a center parallel shaft bearing and a center parallel shaft support plate; the blade center transmission sub-unit also includes a center vertical shaft, a short shaft bearing and a center support frame that are sleeved in sequence, the center parallel shaft is horizontally passed through the tower wall of the adsorption dust removal tower, one end of the center parallel shaft is fixedly connected to the middle of the outer side surface of the blade in the adsorption dust removal tower, the other end of the center parallel shaft is fixedly connected to the inner ring of the center parallel shaft bearing, and the outer ring of the center parallel shaft bearing is fixed to the center parallel shaft support plate; the end faces of both sides of the center parallel shaft support plate are respectively fixedly provided with center vertical shafts in the vertical direction, the axis of the center vertical shaft is arranged in the perpendicular direction to the axis of the center parallel shaft, the center vertical shaft is fixedly connected to the inner ring of the short shaft bearing, the bearing seat of the short shaft bearing is fixedly connected to the center support frame, and the center support frame is rotatably connected to the tower wall; the blade side transmission sub-units are arranged in pairs symmetrically along the center parallel shaft axis, and can drive the blades to rotate around the center parallel shaft on the upper and lower sides.

5. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 4 is characterized in that: The arc-shaped sliding blocks corresponding to the two blade side transmission sub-units arranged in pairs are the first sliding block, the second sliding block, the third sliding block and the fourth sliding block from top to bottom in the vertical direction.

6. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 5 is characterized by: The blade angle driving device includes a driving motor fixed to the lower part of the outer side of the tower wall and a reducer and a rope drum connected in sequence by an output shaft; the blade angle driving device also includes a sliding rope group, the upper part of the sliding rope group is connected to the blade side transmission sub-unit, and the lower part of the sliding rope group is connected to the rope drum, and the sliding rope group includes a forward driving rope and a reverse driving rope; the lower part of the reverse driving rope is wound around the rope drum in the forward direction, and the upper end of the reverse driving rope is connected to the left end of the first slider and the second slider respectively through the upper branch rope, and the upper end of the reverse driving rope is connected to the right end of the third slider and the fourth slider respectively through the lower branch rope; guide columns are respectively provided on the left sides of the first slider and the second slider and on the right sides of the third slider and the fourth slider; the forward driving The lower part of the moving rope is reversely wound on the rope-collecting drum, and the upper end of the forward driving rope is connected to the right end of the first slider and the second slider respectively through the upper branch rope, and the upper end of the forward driving rope is connected to the left end of the third slider and the fourth slider respectively through the lower branch rope; guide columns are respectively provided on the right side of the first slider and the second slider and on the left side of the third slider and the fourth slider; the upper main column is fixedly arranged on the lower left side of the upper side transmission subunit, and the lower main column is fixedly arranged on the lower left side of the lower side transmission subunit, the upper branch rope and the lower branch rope pass around the upper main column and the lower main column and converge to be connected to the reverse driving rope; the upper branch rope and the lower branch rope pass around the upper main column and the lower main column and converge to be connected to the forward driving rope.

7. The aluminum smelting furnace flue gas treatment system based on medium and low temperature SCR denitrification catalysis according to claim 1 is characterized by: A first flue gas concentration detection device is also provided at the inlet of the adsorption dust removal tower; the emission unit is an emission chimney, and a second flue gas concentration detection device is provided in the flue of the emission chimney.

8. The method for treating flue gas from an aluminum smelting furnace based on medium- and low-temperature SCR denitration catalysis according to any one of claims 1 to 7, characterized in that: The following steps are included in sequence: S1, the flue gas treatment control unit controls the induced draft fan to guide the high-calorie flue gas discharged from the exhaust port of the smelting furnace into the waste heat boiler for waste heat recovery treatment; S2. The flue gas treatment control unit determines the real-time flue gas concentration at the inlet of the adsorption dust removal tower through the first flue gas concentration detection device, and then uses the real-time flue gas concentration at the inlet as the input of the activated carbon adsorption process model to ultimately predict the flue gas concentration at the outlet of the adsorption dust removal tower; S3. The flue gas treatment control unit uses the adsorption dust removal treatment control strategy to adjust the activated carbon injection amount in real time by controlling the pressure regulating valve to obtain optimal control of the adsorption dust removal tower; S4. When the detection value of the first flue gas concentration detection device is too large and the activated carbon injection amount is greater than a set first threshold value, the flue gas treatment control unit controls the rotation of the drive motor to swing the blades to a turbulent state, thereby increasing the time for the activated carbon adsorption reaction to achieve sufficient reaction between the activated carbon particles and the flue gas; when the detection value of the first flue gas concentration detection device is lower than a set second threshold value, the flue gas treatment control unit controls the rotation of the drive motor to swing the blades to a vortex state to accelerate the adsorbed flue gas to enter the bag filter unit; Furthermore, the flue gas treatment control unit controls the induced draft fan to guide the pre-treated flue gas into the adsorption dust removal tower for dust removal, and then discharges the dust in the adsorption dust removal tower into the dust collection box, and then transports the powder in the dust collection box through the conveying device; S5. The flue gas treatment control unit sequentially controls the bag dust removal unit, dry deacidification unit, SCR denitrification unit, and alkali solution spraying unit to achieve further dust removal, deacidification, and denitrification treatment of the flue gas, and finally discharges the gas that meets the emission standards into the atmosphere through the emission unit.

9. The method for treating flue gas from an aluminum smelting furnace based on medium- and low-temperature SCR denitration catalysis according to claim 8, characterized in that: The S2 activated carbon adsorption process model includes the following steps: S21. The independent variables of the model include: aluminum smelting furnace load s, tower temperature T, activated carbon injection amount Qc, activated carbon residence time t, adsorption tower inlet dust concentration C i , the dependent variable is the dust concentration C at the outlet of the adsorption tower o ; S22. The specific process of establishing the activated carbon adsorption process model is as follows: The loss function is established through the independent variables and dependent variables of the activated carbon adsorption process model, and the expression is: Where: ε i is a random term that obeys the standard normal distribution, k1 is the variable activated carbon injection amount Q c The reaction coefficient, k2 is the variable outlet flue gas concentration C o The reaction coefficient is represented by the aluminum smelting furnace load s, the tower temperature T, the activated carbon injection amount Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i The adsorption reaction efficiency is determined by the following formula: e=α*s+β*T+γ*Q c +δ*t+ζ*C i Where: e is represented by the aluminum smelting furnace load s, tower temperature T, activated carbon injection amount Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i The adsorption reaction efficiency is determined by α, β, γ, δ and ζ, respectively, the aluminum smelting furnace load s, the tower temperature T, the activated carbon injection amount Q c , activated carbon residence time t, adsorption tower inlet dust concentration C i Contribution of adsorption reaction efficiency; S23. Use the differential evolution algorithm to solve the parameters in the loss function, and establish an activated carbon adsorption process model by optimizing the parameters of the results. The expression of the activated carbon adsorption process model is: y2=f(s,T,Q c ,t,C i ) Where: y2 is the dependent variable of the activated carbon adsorption process model.

10. The method for treating flue gas from an aluminum smelting furnace based on medium- and low-temperature SCR denitrification catalysis according to claim 8, characterized in that: The S3 activated carbon injection control method comprises the following steps: S31. Obtain the data of the current operating status of the aluminum smelting furnace, including the aluminum smelting furnace load, adsorption tower blast volume, flue gas oxygen content and adsorption tower inlet pressure, and normalize them to form the prediction independent variable X1; use the adsorption tower inlet flue gas concentration regression model to predict the activated carbon adsorption tower inlet flue gas concentration C i , whose expression is: C i =GRU(X1) S32. The specific process of the activated carbon adsorption process model to predict the flue gas concentration at the adsorption tower outlet is as follows: i , using the current activated carbon injection amount Q c and activated carbon residence time t, the activated carbon adsorption process model is used to predict the dust concentration C at the outlet of the activated carbon adsorption tower o , whose expression is: C o =f(s,T,Q c ,t,C i ) S33, the specific process of the activated carbon injection amount control method is: Control target C through activated carbon adsorption tower outlet o , the control index is η, if the predicted value C o If the following conditions are met, the current carbon injection amount is the recommended value: η≥η o

Images