A flue gas treatment device and method

Abstract

This invention provides a flue gas treatment device and method. The device includes a shell, multiple demister and dust removal cylinders, and multiple water tanks. The shell is connected to a converter gas channel. Multiple cyclone tubes are installed inside the demister and dust removal cylinders, and the inner wall of the cylinder is covered with a wire mesh layer. Each cyclone tube includes multiple guide tubes and multiple cyclone blades connected to the tops of the guide tubes. Water bladders and flow-blocking plates are installed inside the guide tubes, and the opening and closing of the flow-blocking plates is controlled by the amount of water in the water bladders. This flue gas treatment device is applicable to flue gas treatment at various production stages of converter smelting. By controlling the distance between the water tanks and the demister and dust removal cylinders, the amount of flue gas entering the demister and dust removal cylinders is controlled. The expansion and contraction of the water bladders are adjusted by regulating the amount of water in the water bladders within the demister and dust removal cylinders, and the opening and closing of the guide tubes are adjusted to control the flue gas throughput. The flue gas flow rate entering the demister and dust removal cylinders is adjusted to the speed required for optimal demister and dust removal effect of the wire mesh layer, thus achieving optimal demister and dust removal effect at various stages of converter smelting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas treatment, in particular to a flue gas treatment device and method. BACKGROUND

[0002] Converter smelting is a chemical reaction taking molten iron, scrap steel, ferroalloy, etc. as main raw materials to smelt molten iron into molten steel. Converter smelting is carried out repeatedly, after smelting of the previous furnace is completed, the next furnace smelting is entered, and each furnace smelting basically goes through several different stages, and the flue gas amount, flue gas composition, flue gas temperature and flue gas dust content generated by the converter in each stage change greatly.

[0003] The dust removal method of the converter gas dust removal system includes dry method, semi-dry method and wet method, after the gas is precisely dusted and cooled, the moisture content in the gas is still high, and the chimney is prone to appear the phenomenon of “big white smoke”, and the main components of the white smoke are water mist, aerosol and a small amount of dust.

[0004] In the related art, the big white smoke is basically eliminated by using the wire mesh demisting and dust removal technology. In the whole converter smelting process, the air volume of the fan changes, once the specification of the wire mesh demisting and dust removal device is selected, only the demisting and dust removal efficiency in a certain stage working condition can be high, and the demisting and dust removal efficiencies in other stages are low, finally leading to the fact that the big white smoke phenomenon in the chimneys in other stages is relatively more obvious.

[0005] In summary, how to improve the demisting and dust removal efficiency in the converter gas system in different stages of converter smelting to eliminate the big white smoke is a problem to be solved at present. SUMMARY

[0006] Embodiments of the present application provide a flue gas treatment device and method, which are used to solve the problem of low demisting and dust removal efficiency of the flue gas treatment device and easy generation of big white smoke in the related art.

[0007] Embodiments of the present application provide a flue gas treatment device, which comprises a shell, a plurality of demisting and dust removal cylinders and a plurality of water tanks arranged in the shell; the shell is connected with a converter gas channel;

[0008] A plurality of cyclone pipes are arranged in the cylinder of the demisting and dust removal cylinder, and the inner wall of the cylinder is covered with a steel wire mesh layer;

[0009] The cyclone pipe ascends from the bottom of the demisting and dust removal cylinder to the top of the demisting and dust removal cylinder, the cyclone pipe comprises a plurality of guide pipes and a plurality of cyclone blades respectively connected with the top of the plurality of guide pipes, the channel section of the guide pipe is a closed structure, the channel section of the cyclone blade is an open structure, and the open surface faces the steel wire mesh layer; a water bag and a flow resistance piece are arranged on the section in the guide pipe, and the opening and closing of the flow resistance piece is controlled by the water amount in the water bag;

[0010] The steel wire mesh layer is arranged corresponding to the cyclone vane, and is used for absorbing flue gas guided by the cyclone vane.

[0011] The water tank is located below the demisting and dust removing cylinder, and is a telescopic structure; the distance between the water tank and the demisting and dust removing cylinder in the vertical direction changes with the telescopic length of the water tank, so as to control the amount of flue gas entering the demisting and dust removing cylinder; the telescopic length of the water tank is controlled by the water amount in the water tank.

[0012] Optionally, the water tank comprises a first water bag and a second water bag arranged oppositely on the inner wall of the conduit; the first water bag and the second water bag are both provided with a first water outlet and a first water inlet connected to the first water inlet pipe; the water flow of the first water inlet and the first water outlet is controlled by the adjusting valve.

[0013] The flow resistance sheet comprises a first flow resistance sheet and a second flow resistance sheet stacked; the first flow resistance sheet is provided with at least one first airflow hole, and the second flow resistance sheet is provided with at least one second airflow hole; the two ends of the first flow resistance sheet are in contact with the first water bag and the second water bag respectively, and the two ends of the second flow resistance sheet are in contact with the inner wall of the conduit respectively.

[0014] When the water amount in the first water bag and / or the second water bag changes, the first flow resistance sheet moves on the second flow resistance sheet, so that the relative positions of the first airflow hole and the second airflow hole change, so as to adjust the area of the overlapping region of the first airflow hole and the second airflow hole.

[0015] Optionally, the water tank comprises a water tank top cover, a water tank base, and a water tank wall located between the water tank top cover and the water tank base; the water tank wall is made of flexible telescopic material.

[0016] The water tank further comprises a guide rod connecting the water tank top cover and the water tank base, and a guide sleeve fixedly connected to the upper part of the water tank wall and sleeved on the guide rod; when the water tank wall telescopes, the guide sleeve slides along the guide rod in the vertical direction with the telescoping of the water tank wall.

[0017] The water tank further comprises a second water inlet connected to the second water inlet pipe, and a second water outlet; the second water inlet and the second water outlet are used for controlling the water amount of the water tank.

[0018] Optionally, the demisting and dust removing cylinder further comprises a demisting and dust removing cylinder guide rod, a demisting and dust removing cylinder base, and a conical air inlet; the demisting and dust removing cylinder guide rod is fixed in the center of the demisting and dust removing cylinder; the conical air inlet is arranged in the demisting and dust removing cylinder base.

[0019] The water tank top cover is in the structure of a circular truncated cone, and the taper of the circular truncated cone is consistent with the taper of the conical air inlet.

[0020] Optionally, the device further comprises a flushing spray device arranged above the demisting and dust-removing cylinder, and a third water inlet pipe connected with the flushing spray device, wherein the flushing spray device is used for flushing the demisting and dust-removing cylinder and the water tank.

[0021] Optionally, the device further comprises a sewage pool arranged at the bottom of the flue gas treatment device, wherein the sewage pool is used for receiving sewage generated by flushing the demisting and dust-removing cylinder and the water tank by the flushing spray device, and water flowing out of the water bag and the water tank.

[0022] The sewage pool is connected with a filter at the bottom, wherein the filter is used for filtering sludge in the sewage.

[0023] The sewage pool is connected with a first water outlet pipe, wherein the first water outlet pipe is used for conveying clean water filtered by the filter to a water storage pool.

[0024] Optionally, the device further comprises a liquid level meter used for obtaining water level information in the sewage pool, wherein the liquid level meter determines whether the water level in the sewage pool exceeds an alarm value according to the water level information, and controls the overflow pipe to be opened when the alarm value is exceeded.

[0025] The embodiment of the present application further provides a flue gas treatment method, comprising:

[0026] obtaining a target rotating speed of a fan located in a converter gas channel, and determining a target flue gas amount entering a flue gas treatment device according to the target rotating speed;

[0027] generating a first instruction according to a preset corresponding relationship between the target flue gas amount, a blocking rate of a demisting and dust-removing cylinder and a flue gas passing rate of the demisting and dust-removing cylinder, wherein the first instruction comprises a first blocking rate and a first flue gas passing rate;

[0028] adjusting water amounts of each water tank in a plurality of water tanks according to the first instruction, so that a number of first demisting and dust-removing cylinders blocked by the water tanks reaches a first number, and a ratio of the first number to a total number of the demisting and dust-removing cylinders is the first blocking rate;

[0029] controlling water amounts of water bags by adjusting opening and closing states of flow resistance pieces in each second demisting and dust-removing cylinder according to the first instruction, so that the flue gas passing rate of a guide pipe in each demisting and dust-removing cylinder reaches the first flue gas passing rate, wherein the second demisting and dust-removing cylinder is a demisting and dust-removing cylinder that is not blocked;

[0030] when detecting that the flue gas amount in the flue gas treatment device is greater than the target flue gas amount, generating a second instruction according to the corresponding relationship, wherein the second instruction comprises a second flue gas passing rate, and the second flue gas passing rate is greater than the first flue gas passing rate;

[0031] According to the second instruction, the opening and closing states of the baffles in each of the second mist and dust removal cylinders are adjusted respectively, so that the flue gas passing rate of the ducts in the mist and dust removal cylinders reaches the second flue gas passing rate;

[0032] When the amount of flue gas in the converter gas passage is detected to be less than the target flue gas amount, a third instruction is generated according to a corresponding relationship, the third instruction including a third flue gas passing rate, which is less than the first flue gas passing rate;

[0033] According to the third instruction, the opening and closing states of the baffles in each of the second mist and dust removal cylinders are adjusted respectively, so that the flue gas passing rate of the ducts in the mist and dust removal cylinders reaches the third flue gas passing rate.

[0034] Optionally, when the amount of water in the water tank reaches a maximum value, the mist and dust removal cylinders above the water tank are blocked, and the amount of water in each of the plurality of water tanks is adjusted respectively, so that the number of first mist and dust removal cylinders blocked by the water tank reaches a first number, comprising:

[0035] Determine the number of water tanks in the plurality of water tanks whose current water amount is the maximum value to obtain a current number, and determine the difference between the current number and the first number to obtain a first difference value;

[0036] In the case where the current number is greater than the first number, open the adjusting valves of the second water outlets of the first difference number of water tanks, so that the water in the first difference number of water tanks flows out completely;

[0037] In the case where the current number is less than the first number, open the adjusting valves of the second water inlets of the first difference number of water tanks, so that the amount of water in the first difference number of water tanks reaches the maximum value.

[0038] Optionally, when the first airflow hole and the second airflow hole in the duct of the mist and dust removal cylinder completely overlap, the duct is open; when the first airflow hole and the second airflow hole in the duct have no overlapping area, the duct is closed; the flue gas passing rate is the ratio of the number of open ducts to the total number of ducts; by adjusting the opening and closing states of the baffles in each of the second mist and dust removal cylinders, the amount of water in the water tank is controlled, so that the flue gas passing rate of the ducts in each mist and dust removal cylinder reaches the first flue gas passing rate, comprising:

[0039] Determine the target number of open ducts corresponding to the first flue gas passing rate;

[0040] Determine the number of the plurality of conduits in the on state, get the current on conduit number, and determine the difference between the current on conduit number and the target number, get the second difference value;

[0041] In the case where the current on conduit number is greater than the target number, the inlet of the second water bag in the second difference value number of conduits is controlled to be filled with water, the outlet is closed, and the inlet of the first water bag is controlled to be closed, and the outlet is opened to make the first water bag elongate; the first water bag pushes the first flow blocking piece to move in the direction of the first water bag during elongation, so that the first airflow hole and the second airflow hole have no overlapping area.

[0042] In the case where the current on conduit number is less than the target number, the inlet of the first water bag in the second difference value number of conduits is controlled to be filled with water, the outlet is closed, and the inlet of the second water bag is controlled to be closed, and the outlet is opened to make the first water bag elongate; the first water bag pushes the first flow blocking piece to move in the direction of the second water bag during elongation, so that the first airflow hole and the second airflow hole are completely overlapped.

[0043] The embodiments of the present application have at least the following beneficial effects:

[0044] The flue gas treatment device provided by the embodiment of the present application, the device comprises a shell and a plurality of demisting and dust removal cylinders and a plurality of water tanks; the shell is connected with a converter gas passage; a plurality of cyclone tubes are arranged in the cylinder of the demisting and dust removal cylinder, and the inner wall of the cylinder is covered with a steel wire mesh layer; the cyclone tube spirally rises from the bottom of the demisting and dust removal cylinder to the top of the demisting and dust removal cylinder, and the cyclone tube comprises a plurality of conduits and a plurality of cyclone blades connected with the top of the plurality of conduits respectively; a water bag and a flow blocking piece are arranged in the conduit; the opening and closing of the flow blocking piece is controlled by the water amount in the water bag; the flue gas treatment device can be applied to flue gas treatment in each production stage of converter smelting; by controlling the distance between the water tank and the demisting and dust removal cylinder, the amount of flue gas entering the demisting and dust removal cylinder is controlled, and by adjusting the water amount of the water bag in the demisting and dust removal cylinder, the expansion and contraction amount of the water bag is adjusted, the opening and closing of the conduit is adjusted to control the passing rate of the flue gas, the flue gas flow rate entering the demisting and dust removal cylinder is adjusted to the speed required by the best demisting and dust removal effect of the steel wire mesh layer, and the demisting and dust removal effect in each stage of converter smelting is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0046] Figure 1 A schematic diagram of a flue gas treatment device provided for an embodiment of the present application;

[0047] Figure 2 A schematic diagram of a demisting and dust removal cylinder structure provided for an embodiment of the present application;

[0048] Figure 3 A schematic diagram of a water bag and baffle connection in a conduit open state provided for an embodiment of the present application;

[0049] Figure 4 A schematic diagram of a water bag and baffle connection in a conduit closed state provided for an embodiment of the present application;

[0050] Figure 5 A schematic diagram of a water sump structure provided for an embodiment of the present application;

[0051] Figure 6 A flowchart of a flue gas treatment method provided for an embodiment of the present application;

[0052] Figure 7 A side view of a baffle in a conduit open state provided for an embodiment of the present application;

[0053] Figure 8 A side view of a baffle in a conduit closed state provided for an embodiment of the present application.

[0054] Reference signs:

[0055] 1 - shell; 2 - demisting and dust removal cylinder; 3 - water sump; 4 - converter gas passage; 5 - flushing and spraying equipment; 6 - sewage pool; 7 - first water inlet pipe; 8 - second water inlet pipe; 9 - third water inlet pipe; 10 - first water outlet pipe; 11 - filter; 12 - cooling tower; 13 - overflow pipe; 14 - liquid level meter; 15 - water storage tank; 16 - regulating valve; 21 - steel mesh layer; 22 - conduit; 23 - cyclone vane; 24 - demisting and dust removal cylinder guide rod; 25 - demisting and dust removal cylinder base; 26 - conical air inlet; 27 - water bag; 271 - first water bag; 272 - second water bag; 28 - baffle; 281 - first baffle; 282 - second baffle; 29 - first air flow hole; 30 - second air flow hole; 31 - first water inlet; 32 - first water outlet; 33 - water sump top cover; 34 - water sump base; 35 - water sump wall; 36 - guide rod; 37 - guide sleeve; 38 - second water inlet; 39 - second water outlet. DETAILED DESCRIPTION

[0056] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0057] Figure 1 A schematic diagram of a flue gas treatment device provided by the embodiments of the present application is shown in the figure.

[0058] As shown in the figure, the flue gas treatment device comprises a shell and a plurality of demisting and dedusting cylinders and a plurality of water tanks arranged in the shell; the shell is connected with a converter gas channel. Figure 1

[0059] Specifically, the converter gas channel 4 is mainly used for conveying flue gas generated in each stage of the converter smelting process and conveying the flue gas into the shell 1. The water tank 3 is used for cooperating with the demisting and dedusting cylinder 2 to control whether the flue gas can enter the demisting and dedusting cylinder 2. The plurality of cyclone tubes in the demisting and dedusting cylinder 2 are used for guiding the flue gas entering the demisting and dedusting cylinder 2, and the steel wire mesh layer 21 is used for treating the flue gas guided by the cyclone tubes.

[0060] Figure 2 A structural schematic diagram of the demisting and dedusting cylinder provided by the embodiments of the present application is shown in the figure.

[0061] As shown in the figure, a plurality of cyclone tubes are arranged in the cylinder of the demisting and dedusting cylinder, and the inner wall of the cylinder is covered with a steel wire mesh layer. Figure 2

[0062] The cyclone tubes rise spirally from the bottom of the demisting and dedusting cylinder to the top of the demisting and dedusting cylinder, the cyclone tubes comprise a plurality of guide pipes and a plurality of cyclone blades respectively connected with the top of the guide pipes, the channel section of the guide pipe is a closed structure, the channel section of the cyclone blade is an open structure, and the open surface faces the steel wire mesh layer; a water bag and a flow resistance piece are arranged on the section in the guide pipe, and the opening and closing of the flow resistance piece is controlled by the water amount in the water bag.

[0063] The steel wire mesh layer is arranged correspondingly with the cyclone blades and is used for absorbing the flue gas guided by the cyclone blades.

[0064] Specifically, the plurality of cyclone tubes in the demisting and dedusting cylinder 2 are used for guiding the flue gas entering the demisting and dedusting cylinder 2, and the steel wire mesh layer 21 is used for treating the flue gas guided by the cyclone tubes.

[0065] ​​The working principle of the steel wire mesh demisting and dust removal is gravity and inertial impact. When the flue gas passes through the demister at a certain speed, it collides with the internal structure of the demister and adheres to the surface of the demister. The mist and dust on the surface of the steel wire mesh mix and gradually accumulate, and when the weight reaches a certain level, it will be separated from the steel wire mesh. Thus, gas-liquid separation is achieved, and the purpose of purifying flue gas is achieved. When the steel wire mesh is used for demisting and dust removal, the speed selection is very important. If the speed is too high, the mist droplets are easily carried away by the gas; if the speed is too low, the mist droplets cannot effectively collide with the steel wire mesh structure, and the demisting and dust removal efficiency is low.

[0066] The cyclone pipe of the demisting and dust removal cylinder 2 is composed of two parts, a guide pipe 22 and a cyclone vane 23, and spirally rises from the bottom of the demisting and dust removal cylinder 2 to the top of the demisting and dust removal cylinder 2. The cross section of the guide pipe 22 is a "mouth" shaped structure with a closed periphery, which is equivalent to a channel. The flue gas is guided and rotated in the guide pipe 22. Water pockets and flow resistance pieces are arranged on the cross section to control whether the flue gas can pass through the guide pipe 22 through the cooperation of the water amount of the water pockets and the flow resistance pieces. The cyclone vane 23 is a slide-like structure with one face opened based on the shape of the guide pipe 22. The cyclone vane 23 is arranged corresponding to the steel wire mesh layer 21 and has the same height as the steel wire mesh layer 21. The opening faces the steel wire mesh layer 21, which facilitates the upward rotation of the flue gas and the flow of the flue gas to the steel wire mesh layer 21, and realizes the demisting and dust removal of the flue gas by the steel wire mesh layer 21.

[0067] The water tank is located below the demisting and dust removal cylinder, and the water tank is a telescopic structure. The distance between the water tank and the demisting and dust removal cylinder in the vertical direction changes with the telescopic length of the water tank to control the amount of flue gas entering the demisting and dust removal cylinder. The telescopic length of the water tank is controlled by the amount of water in the water tank.

[0068] Specifically, all the water tanks 3 are arranged directly below the demisting and dust removal cylinder 2, and the telescopic length of the water tank 3 in the vertical direction can be controlled by adjusting the amount of water in the water tank 3. During the change of the amount of water in the water tank 3, the distance between the water tank 3 and the demisting and dust removal cylinder 2 arranged above the water tank 3 changes, and the amount of flue gas entering the demisting and dust removal cylinder 2 above also changes.

[0069] In summary, the smoke treatment device provided by the embodiment of the present application comprises a shell 1 and a plurality of mist and dust removal cylinders 2 and a plurality of water tanks 3; the shell 1 is connected with a converter gas channel 4; a plurality of cyclone tubes are arranged in the cylinder of the mist and dust removal cylinder 2, and the inner wall of the cylinder is covered with a steel wire mesh layer 21; the cyclone tube spirally rises from the bottom of the mist and dust removal cylinder 2 to the top of the mist and dust removal cylinder 2, and the cyclone tube comprises a plurality of conduits 22 and a plurality of cyclone vanes 23 connected with the top of the plurality of conduits 22 respectively, a water bag and a flow resistance sheet are arranged in the conduit 22, and the opening and closing of the flow resistance sheet is controlled by the water amount in the water bag; the smoke treatment device can be applied to smoke treatment in each production stage of converter smelting, the distance between the water tank 3 and the mist and dust removal cylinder 2 is controlled, then the amount of smoke entering the mist and dust removal cylinder 2 is controlled, the water amount of the water bag in the mist and dust removal cylinder 2 is adjusted to adjust the expansion and contraction amount of the water bag, the opening and closing of the conduit 22 is adjusted to control the passing rate of the smoke, the flow rate of the smoke entering the mist and dust removal cylinder 2 is adjusted to the speed required by the best mist and dust removal effect of the steel wire mesh layer 21, and the mist and dust removal effect in each stage of converter smelting is best.

[0070] In a possible implementation, the water bag comprises a first water bag and a second water bag arranged opposite to the inner wall of the conduit; the first water bag and the second water bag are both provided with a first water outlet and a first water inlet connected with a first water inlet pipe, and the water flow of the first water inlet and the first water outlet is controlled by an adjusting valve;

[0071] The flow resistance sheet comprises a first flow resistance sheet and a second flow resistance sheet arranged in layers, the first flow resistance sheet is provided with at least one first airflow hole, and the second flow resistance sheet is provided with at least one second airflow hole; the two ends of the first flow resistance sheet are in contact with the first water bag and the second water bag respectively, and the two ends of the second flow resistance sheet are in contact with the inner wall of the conduit;

[0072] When the water amount in the first water bag and / or the second water bag changes, the first flow resistance sheet moves on the second flow resistance sheet, the relative positions of the first airflow hole and the second airflow hole change, and the area of the overlapping region of the first airflow hole and the second airflow hole is adjusted.

[0073] Figure 3 The connection diagram of the water bag and the flow resistance sheet in the conduit open state provided by the embodiment of the present application is shown.

[0074] Figure 4 The connection diagram of the water bag and the flow resistance sheet in the conduit closed state provided by the embodiment of the present application is shown.

[0075] As shown in Figure 3 or Figure 4 , the connection diagram of the water bag and the flow resistance sheet in the conduit open state provided by the embodiment of the present application is shown. Figure 3 and Figure 4 are Figure 2The water bag and the baffle in different states of the middle A-A surface are connected as shown in the schematic view. Specifically, two water bags and two baffles are arranged in each conduit 22. The two water bags are a first water bag 271 and a second water bag 272, and a first water inlet 31 and a first water outlet 32 are arranged on each water bag, and an adjusting valve 16 is arranged on the first water inlet 31 and the first water outlet 32 for adjusting the water flow of the first water inlet 31 and the first water outlet 32, wherein the adjusting valve 16 is controlled by a valve control gas. The two baffles are a first baffle 281 and a second baffle 282, at least one first airflow hole 29 is arranged on the first baffle 281, and the two ends are connected to the first water bag 271 and the second water bag 272. At least one second airflow hole 30 is arranged on the second baffle 282, and the two ends are fixedly connected to the inner wall of the conduit 22. The first baffle 281 can move, and the second baffle 282 is fixed.

[0076] When the water amount in the water bag in the conduit 22 changes, the length of the water bag changes, which drives the first baffle 281 connected to the water bag to move on the second baffle 282. When the first baffle 281 moves, the relative position between the first airflow hole 29 on the first baffle 281 and the second airflow hole 30 on the second baffle 282 changes, which changes the overlapping area of the overlapping first airflow hole 29 and second airflow hole 30. In one possible implementation, the water tank includes a water tank top cover, a water tank base, a water tank wall between the water tank top cover and the water tank base, and the water tank wall is made of flexible and stretchable material.

[0077] The water tank further includes a guide rod connecting the water tank top cover and the water tank base, and a guide sleeve fixedly connected to the upper part of the water tank wall and sleeved on the guide rod. When the water tank wall stretches and contracts, the guide sleeve slides along the guide rod in the vertical direction with the stretching and contraction of the water tank wall.

[0078] The water tank further includes a second water inlet connected to a second water inlet pipe, and a second water outlet, and the second water inlet and the second water outlet are used to control the water amount of the water tank.

[0079] Figure 5 The water tank provided by the embodiment of the present application is shown in the schematic view.

[0080] As Figure 5As shown, specifically, the sump base 34 is used to position and fix the sump 3, the extendable sump wall 35 can extend in the vertical direction according to the amount of water in the sump 3, the guide rod 36 is installed between the sump top cover 33 and the sump base 34. The guide sleeve 37 is fixedly connected to the upper part of the sump wall 35, is circumferentially distributed in three parts, and is sleeved on the guide rod 36. The guide sleeve 37 slides up and down along the guide rod 36 following the extension and contraction of the sump wall 35, thereby ensuring the vertical extension and contraction of the sump 3. The sump 3 is also provided with a second water inlet 38 and a second water outlet 39. The second water inlet 38 is connected with the second water inlet pipe 8, and the water entering the second water inlet 38 is transported through the second water inlet pipe 8. When the water inflow of the second water inlet 38 is greater than the water outflow of the second water outlet 39, the amount of water in the sump 3 increases, and the sump wall 35 extends vertically upward along the guide rod 36. When the water inflow of the second water inlet 38 is less than the water outflow of the second water outlet 39, the amount of water in the sump 3 increases, and the sump wall 35 contracts vertically downward along the guide rod 36.

[0081] The amount of water in the plurality of sumps 3 is controlled by simultaneously controlling the water inflow of the single or multiple second water inlets 38 and the water outflow of the second water outlet 39 through the second water inlet pipe 8, thereby more flexibly and effectively controlling the opening and closing number of the demisting and dust removing cylinder 2.

[0082] In a possible implementation, the demisting and dust removing cylinder further comprises a demisting and dust removing cylinder guide rod, a demisting and dust removing cylinder base, and a conical air inlet, wherein the demisting and dust removing cylinder guide rod is fixed in the center of the demisting and dust removing cylinder; and the conical air inlet is arranged in the demisting and dust removing cylinder base.

[0083] The sump top cover is in a circular truncated cone structure, and the taper of the circular truncated cone structure is consistent with the taper of the conical air inlet.

[0084] Reference Figure 2 Specifically, the demisting and dust removing cylinder 2 further comprises a demisting and dust removing cylinder guide rod 24 fixed in the center of the demisting and dust removing cylinder 2, a demisting and dust removing cylinder base 25, and a conical air inlet 26 arranged in the demisting and dust removing cylinder base 25. The top cover of the sump 3 is in a circular truncated cone structure, the taper of the circular truncated cone top cover is the same as the taper of the conical air inlet 26 at the bottom of the demisting and dust removing cylinder 2, and the two are matched with each other. When the circular truncated cone top cover of the sump 3 is in contact with the conical air inlet 26 at the bottom of the demisting and dust removing cylinder 2, the flue gas cannot enter the demisting and dust removing cylinder 2.

[0085] In a possible implementation, the demisting and dust removing cylinder further comprises a flushing and spraying device arranged above the demisting and dust removing cylinder and a third water inlet pipe connected with the flushing and spraying device, wherein the flushing and spraying device is used for flushing the demisting and dust removing cylinder and the sump.

[0086] Specifically, the flushing spray device 5 is arranged above the demisting and dedusting cylinder 2 to directly flush the demisting and dedusting cylinder 2. The third water inlet pipe 9 is connected to the flushing spray device 5 and supplies water to the flushing spray device 5. The flushing device is intermittently operated. For example, after the demisting and dedusting cylinder 2 is operated for 6 hours, the solid content attached to the steel wire mesh layer 21 increases to affect the ventilation, the spray layer is opened for 5 minutes to flush, the demisting and dedusting cylinder 2 is kept clean and ventilated, and the water falling from the flushing of the demisting and dedusting cylinder 2 also falls on the water tank 3 below the demisting and dedusting cylinder 2 and falls along the water tank 3, thereby achieving cleaning of the water tank 3.

[0087] In a possible implementation, the sewage tank arranged at the bottom of the flue gas treatment device is further included, which is used to receive sewage generated by flushing the demisting and dedusting cylinder and the water tank by the flushing spray device, and water flowing out of the water bag and the water tank;

[0088] The filter is connected to the bottom of the sewage tank and is used to filter sludge in the sewage;

[0089] The first water outlet pipe is connected to the sewage tank and is used to transport clean water filtered by the filter to the water storage tank.

[0090] Specifically, the sewage tank 6 is further arranged at the bottom of the flue gas treatment device, which is used to collect sewage generated by flushing the demisting and dedusting cylinder 2 and the water tank 3 by the flushing spray device 5, and water flowing out of the water bag during adjustment of the water amount of the water bag and water flowing out of the water tank 3 during adjustment of the water amount of the water tank 3. The filter 11 is connected to the bottom of the sewage tank 6 and is used to filter sewage collected in the sewage tank 6. The sludge filtered out is discharged to a sewage comprehensive treatment site, and the clean water obtained after filtration is cooled by the cooling tower 12 and then transported to the water storage tank 15 through the first water outlet pipe 10. Then, the clean water in the water storage tank 15 is transported to the first water inlet pipe 7, the second water inlet pipe 8 and the third water inlet pipe 9 connected to the water storage tank 15 to be recycled.

[0091] In a possible implementation, the liquid level meter is further included to obtain water level information in the sewage tank. The liquid level meter determines whether the water level in the sewage tank exceeds an alarm value according to the water level information and controls the overflow pipe to be opened when the alarm value is exceeded.

[0092] Specifically, the float of the liquid level meter 14 is placed in the sewage pool 6 to obtain the water level in the sewage pool 6 and transmit the water level information to the liquid level meter 14, and the liquid level meter 14 converts the water level information in the sewage pool 6 into a water level signal and controls the opening and closing of the overflow pipe 13 circuit. When the water level exceeds the warning value, the overflow pipe 13 circuit is controlled to open, and the sewage enters from one end of the overflow pipe 13 extending into the sewage pool 6 and flows out from the other end outside the sewage pool 6 into the comprehensive sewage treatment place, so as to control the water level of the sewage pool 6 not to exceed the warning value, and prevent the sewage from flowing back into the converter gas pipeline when the sewage exceeds the warning value.

[0093] In order to more clearly introduce the flue gas treatment device provided by the embodiment of the present application, the following introduces the treatment method of the system in combination with Figure 5 In order to more clearly introduce the flue gas treatment device provided by the embodiment of the present application, the following introduces the treatment method of the system in combination with

[0094] As shown in Figure 6 The treatment method of the flue gas treatment device includes the following steps:

[0095] Step 101, obtaining the target rotating speed of the fan located in the converter gas passage, and determining the target flue gas amount entering the flue gas treatment device according to the target rotating speed.

[0096] Specifically, the execution subject of the present scheme is a system programmable logic controller, hereinafter referred to as a controller.

[0097] The converter smelting process includes eleven stages of "converter waiting → adding scrap steel → adding molten iron → pre-blowing oxygen smelting (flue gas diffusion stage, and adding material and slag making) → mid-blowing oxygen smelting (coal gas recovery stage) → late-blowing oxygen smelting (flue gas diffusion stage) → temperature measurement and sampling → (supplementary blowing) → tapping → slag splashing and furnace protection → slagging → converter waiting → adding scrap steel".

[0098] In actual application, according to the eleven different stages of the converter smelting process, the rated rotating speed of the fan in the converter gas demisting and dust removal system is set in the controller as follows: in the scrap steel adding stage, the rotating speed of the fan is 30% of the rated rotating speed; in the molten iron adding stage, the rotating speed of the fan is 75% of the rated rotating speed; in the pre-blowing oxygen smelting stage, the rotating speed of the fan is 75% of the rated rotating speed; in the coal gas recovery stage of the mid-blowing oxygen smelting stage, the rotating speed of the fan is 95% of the rated rotating speed; in the flue gas diffusion stage of the late-blowing oxygen smelting stage, the rotating speed of the fan is 75% of the rated rotating speed; in the temperature measurement and sampling stage, the rotating speed of the fan is 50% of the rated rotating speed; in the supplementary blowing stage, the rotating speed of the fan is 75% of the rated rotating speed; in the tapping stage, the rotating speed of the fan is 50% of the rated rotating speed; in the slag splashing and furnace protection stage, the rotating speed of the fan is 75% of the rated rotating speed; in the slagging stage, the rotating speed of the fan is 50% of the rated rotating speed; and in the converter waiting stage, the rotating speed of the fan is 30% of the rated rotating speed.

[0099] From the above, in the converter gas mist and dust removal system, the fan speed is mainly set to 95%, 75%, 50% and 30% of the rated speed of the fan. In the controller, the flue gas quantity corresponding to each fan speed is preset, which can make the mist and dust removal cylinder 2 achieve the best mist and dust removal efficiency. For example, when the preset fan speed is 95% of the rated speed, the controller calculates the target flue gas quantity Q1; when the preset fan speed is 75% of the rated speed, the controller calculates the target flue gas quantity Q2; when the preset fan speed is 50% of the rated speed, the controller calculates the target flue gas quantity Q3; when the preset fan speed is 30% of the rated speed, the controller calculates the target flue gas quantity Q4. The target flue gas quantity is the flue gas quantity that can make the mist and dust removal cylinder 2 achieve the best mist and dust removal efficiency, and the controller obtains the current speed and the target flue gas quantity determined according to the speed.

[0100] Step 102, according to the corresponding relationship between the preset target flue gas quantity and the blocking rate of the mist and dust removal cylinder, and the flue gas passing rate of the mist and dust removal cylinder, a first instruction is generated; the first instruction includes a first blocking rate and a first flue gas passing rate.

[0101] Specifically, the controller presets the corresponding relationship between the target flue gas quantity and the blocking rate of the mist and dust removal cylinder 2 and the flue gas passing rate of the mist and dust removal cylinder 2 under different fan speeds, generates a first instruction, and the first instruction includes the first blocking rate and the first flue gas passing rate corresponding to the target flue gas quantity under different fan speeds. The first blocking rate is the ratio of the number of mist and dust removal cylinders 2 blocked by the water tank 3 to the total number of mist and dust removal cylinders 2, and the first flue gas passing rate is the ratio of the number of open conduits to the total number of conduits. When the flue gas quantity is the target flue gas quantity and the flue gas passing rate is the first flue gas passing rate, the mist and dust removal cylinder 2 reaches the best mist and dust removal efficiency, and the flue gas flow rate in the corresponding conduit 22 is determined. In this case, the mist and dust removal cylinder 2 effectively adsorbs the water mist, aerogel and dust in the flue gas, and the flue gas discharged into the atmosphere after being treated by the mist and dust removal cylinder 2 has no "big white smoke" phenomenon.

[0102] For example, when the controller presets the fan speed to be 95% of the rated speed and the target flue gas quantity is Q1, the first blocking rate is 0 and the first flue gas passing rate is 90%; when the fan speed is 75% of the rated speed and the target flue gas quantity is Q2, the first blocking rate is 15% and the first flue gas passing rate is 70%; when the fan speed is 50% of the rated speed and the target flue gas quantity is Q3, the first blocking rate is 30% and the first flue gas passing rate is 45%; when the fan speed is 30% of the rated speed and the target flue gas quantity is Q4, the first blocking rate is 55% and the first flue gas passing rate is 30%.

[0103] Step 103, according to the first instruction, respectively adjust the water quantity of each water tank to make the number of the first demisting and dust-removing cylinders separated by the water tank reach a first number, and the ratio of the first number to the total number of the demisting and dust-removing cylinders is the first separation rate.

[0104] Specifically, when the controller obtains the specific value of the first separation rate in the first instruction information according to the fan speed, the first number of the first demisting and dust-removing cylinders 2 separated by the water tank 3 corresponding to the first separation rate is calculated, and the water quantity in each water tank 3 is adjusted so that the first number of the water tanks 3 is elongated to separate the first number of the first demisting and dust-removing cylinders 2, and the separation rate reaches the first separation rate.

[0105] Step 104, according to the first instruction, by adjusting the opening and closing state of the flow resistance piece in each second demisting and dust-removing cylinder, the water quantity of the water tank is controlled so that the flue gas passing rate of the guide pipe in each demisting and dust-removing cylinder reaches the first flue gas passing rate; the second demisting and dust-removing cylinder is the demisting and dust-removing cylinder that is not separated.

[0106] Specifically, when the controller obtains the specific value of the first flue gas passing rate in the first instruction information according to the fan speed, the number of the open guide pipes corresponding to the first flue gas passing rate is calculated, and the opening and closing state of the flow resistance piece in each second demisting and dust-removing cylinder 2 is adjusted so that the ratio of the number of the open guide pipes in the second demisting and dust-removing cylinder 2 to the total number of the guide pipes 22 reaches the first flue gas passing rate, and the second demisting and dust-removing cylinder 2 is the demisting and dust-removing cylinder 2 that is not separated by the water tank 3.

[0107] Step 105, when it is detected that the flue gas quantity in the flue gas treatment device is greater than the target flue gas quantity, a second instruction is generated according to the corresponding relationship, and the second instruction includes a second flue gas passing rate, which is greater than the first flue gas passing rate.

[0108] Specifically, when the controller detects that the flue gas quantity in the flue gas treatment device is greater than the target flue gas quantity, a second instruction is generated according to the corresponding relationship between the flue gas quantity and the flue gas passing rate of the demisting and dust-removing cylinder 2, and the flue gas passing rate in the second instruction is the second flue gas passing rate. In order to keep the demisting and dust-removing cylinder 2 operating efficiently, the flue gas passing through the guide pipe 22 should be controlled at the flow rate when the flue gas quantity is the target flue gas quantity at the current fan speed and the flue gas passing rate is the first flue gas passing rate. Since the flue gas quantity is greater than the target flue gas quantity, if the passing rate is still the first flue gas passing rate at this time, the flow rate of the flue gas passing through the guide pipe 22 increases, and the high speed causes the dust-containing mist droplets to be easily carried away by the gas, resulting in a decrease in the efficiency of the demisting and dust-removing cylinder 2. Therefore, when the flue gas quantity is greater than the target flue gas quantity, it is necessary to ensure that the second flue gas passing rate is greater than the first flue gas passing rate, so as to ensure that the flow rate of the flue gas in the guide pipe 22 is the flow rate at which the demisting and dust-removing efficiency is best.

[0109] Step 106, according to the second instruction, respectively adjust the opening and closing state of the damper in each second mist eliminator and dust removal cylinder to make the flue gas passing rate of the duct in the mist eliminator and dust removal cylinder reach the second flue gas passing rate.

[0110] Specifically, according to the flue gas amount and the second flue gas passing rate information contained in the second instruction, the opening and closing of the damper in the duct 22 in the mist eliminator and dust removal cylinder 2 not separated by the water tank 3 are adjusted respectively to make the ratio of the number of open ducts to the total number of ducts 22 reach the second flue gas passing rate.

[0111] Step 107, when detecting that the flue gas amount in the converter gas passage is less than the target flue gas amount, generating a third instruction according to the corresponding relationship, the third instruction contains a third flue gas passing rate, which is less than the first flue gas passing rate.

[0112] Specifically, when the controller detects that the flue gas amount in the flue gas treatment device is less than the target flue gas amount, a third instruction is generated according to the corresponding relationship between the flue gas amount and the flue gas passing rate of the mist eliminator and dust removal cylinder 2, and the flue gas passing rate in the third instruction is the third flue gas passing rate. Since the flue gas amount is less than the target flue gas amount, if the passing rate is still the first flue gas passing rate at this time, the flow rate of the flue gas passing through the duct 22 will be too small, which will result in that the mist droplets cannot effectively collide with the steel wire mesh structure, thus reducing the mist and dust removal efficiency. Therefore, when the flue gas amount is less than the target flue gas amount, it is necessary to ensure that the third flue gas passing rate is less than the first flue gas passing rate, so as to ensure that the flow rate of the flue gas in the duct 22 is the optimal flow rate for the mist and dust removal efficiency.

[0113] Step 108, according to the third instruction, respectively adjust the opening and closing state of the damper in each second mist eliminator and dust removal cylinder to make the flue gas passing rate of the duct in the mist eliminator and dust removal cylinder reach the third flue gas passing rate.

[0114] Specifically, according to the flue gas amount and the third flue gas passing rate information contained in the third instruction, the opening and closing of the damper in the duct 22 in the mist eliminator and dust removal cylinder 2 not separated by the water tank 3 are adjusted respectively to make the ratio of the number of open ducts to the total number of ducts 22 reach the third flue gas passing rate.

[0115] It should be noted that when the fan speed is 95%, 75%, 50% and 30% of the rated speed of the fan, a closing rate of the guide pipe 22 in the mist and dust removal cylinder 2 can be set first, and then a few guide pipes 22 are adjusted according to the target flue gas amount to achieve the number of guide pipes required for the best mist and dust removal efficiency. In this way, when the fan speed is switched, the guide pipe 22 can quickly reach the first flue gas rate. For example, when the fan speed is switched to 95% of the rated speed of the fan, the closing rate of the guide pipe 22 in the mist and dust removal cylinder 2 can be controlled to 0 at this time to avoid the accumulation of flue gas in the system. When the fan speed is switched to 75%, 50% and 30% of the rated speed of the fan, the flue gas amount is relatively small, and the closing rate of the guide pipe 22 in the mist and dust removal cylinder 2 can be controlled to 15%.

[0116] In one possible implementation, when the water amount in the water tank reaches the maximum value, the mist and dust removal cylinder above the water tank is blocked, and the step 103 includes the following steps 1031-1033:

[0117] Step 1031, determine the number of water tanks with the maximum water amount in the plurality of water tanks to obtain a current number, and determine the difference between the current number and the first number to obtain a first difference;

[0118] Step 1032, in the case that the current number is greater than the first number, open the adjusting valve of the second water outlet of the first difference number of water tanks to make the water in the first difference number of water tanks flow out completely;

[0119] Step 1033, in the case that the current number is less than the first number, open the adjusting valve of the second water inlet of the first difference number of water tanks to make the water amount of the first difference number of water tanks reach the maximum value.

[0120] Specifically, the number of water tanks 3 with the maximum water amount in all current water tanks 3 is also the number of mist and dust removal cylinders blocked by the water tank 3, which is taken as the current number, and the difference between the current number and the first number is taken as the first difference.

[0121] Determine the size of the current number and the first number. If the current water amount is greater than the first number, open the adjusting valve 16 of the water outlet of the first difference number of water tanks 3 with the maximum water amount, and the first difference number of water tanks 3 is contracted, so that the number of water tanks 3 with the maximum water amount reaches the first number, that is, the number of mist and dust removal cylinders 2 blocked by the water tank 3 is the first number. If the current water amount is less than the first number, open the adjusting valve 16 of the water inlet of the first difference number of water tanks 3 with the minimum water amount, and the first difference number of water tanks 3 is elongated, so that the number of water tanks 3 with the maximum water amount reaches the first number, that is, the number of mist and dust removal cylinders 2 blocked by the water tank 3 is the first number.

[0122] In one possible implementation, the duct is open when the first and second airflow holes in the duct of the demister dust collector completely overlap; the duct is closed when there is no overlap between the first and second airflow holes in the duct; the flue gas conductivity rate is the ratio of the number of open ducts in the demister dust collector to the total number of ducts, and step 104 includes the following steps 1041-4044:

[0123] Step 1041: Determine the target number of ducts corresponding to the first flue gas throughput rate;

[0124] Step 1042: Determine the number of catheters in the conductive state among the plurality of catheters to obtain the current number of conductive catheters, and determine the difference between the current number of conductive catheters and the target number to obtain a second difference;

[0125] Step 1043: When the current number of conductive tubes is greater than the target number, control the water inlet of the second water bladder in the second difference number tube to enter water and close the water outlet, and control the water inlet of the first water bladder to close and the water outlet to open, so that the second water bladder extends; during the extension process, the second water bladder pushes the first flow-blocking plate to move towards the first water bladder, so that the first airflow hole and the second airflow hole have no overlapping area;

[0126] Step 1044: When the current number of conductive tubes is less than the target number, control the water inlet of the first water bladder in the second difference number of tubes to enter water and close the water outlet, and control the water inlet of the second water bladder to close and the water outlet to open so that the first water bladder extends; during the extension process, the first water bladder pushes the first flow-blocking plate to move towards the second water bladder so that the first airflow hole and the second airflow hole completely overlap.

[0127] Figure 7 This is a side view of the flow choke when the conduit is in the open state.

[0128] Figure 8 This is a side view of the choke plate with the conduit closed.

[0129] Figure 7 yes Figure 3 A view of the middle choke plate from direction B, as shown below. Figure 7 As shown, specifically, when the first airflow hole 29 of the first baffle 281 and the second airflow hole 30 of the second baffle 282 in the conduit 22 completely overlap, the conduit 22 is open. Figure 8 yes Figure 4 A view of the middle choke plate from direction B, as shown below. Figure 8As shown, when there is no overlap between the first airflow hole 29 of the first baffle 281 and the second airflow hole 30 of the second baffle 282 in the conduit 22, the conduit 22 is closed.

[0130] Determine the first flue gas throughput rate corresponding to the current fan speed, and the number of ducts calculated based on the first flue gas throughput rate, as the target quantity. Determine the current actual number of ducts, and calculate the difference between the current actual number of ducts and the target quantity, as the second difference.

[0131] When the current number of open conduits exceeds the target number, the regulating valve 16 controls the water inlet of the second water bladder 272 in the second difference number of open conduits 22 in the demisting and dust removal cylinder 2 that is not isolated by the water tank 3, while closing the outlet of the second water bladder 272 and simultaneously closing the inlet of the first water bladder 271 and opening the outlet of the first water bladder 271, causing the second water bladder 272 to extend. During the extension process, the second water bladder 272 pushes the first flow-blocking plate 281 connected between the first water bladder 271 and the second water bladder 272 towards the first water bladder 271 until there is no overlap between the first airflow hole 29 of the first water bladder 271 and the second airflow hole 30 of the second water bladder 272, at which point the conduit 22 closes, and the number of open conduits reaches the target number.

[0132] When the current number of conductive conduits is less than the target number, water is introduced into the inlet of the first water bladder 271 in the second difference number of closed conduits 22 in the demisting and dust removal cylinder 2 (not separated by the water tank 3) via the regulating valve 16, while the outlet of the first water bladder 271 is closed. Simultaneously, the inlet of the second water bladder 272 is closed, and the outlet of the second water bladder 272 is opened, causing the first water bladder 271 to extend. During the extension process, the first water bladder 271 pushes the first flow-blocking plate 281 connected between the first water bladder 271 and the second water bladder 272 towards the second water bladder 272 until the first airflow hole 29 of the first water bladder 271 and the second airflow hole 30 of the second water bladder 272 completely overlap, and the conduit 22 is connected. At this time, the number of conductive conduits reaches the target number. Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0133] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A flue gas treatment apparatus, characterized in that, The flue gas treatment device comprises a shell and a plurality of mist and dust removal cylinders and a plurality of water tanks arranged in the shell; the shell is connected with a converter gas channel; A plurality of cyclone tubes are arranged in the mist and dust removal cylinder, and the inner wall of the mist and dust removal cylinder is covered with a steel wire mesh layer; The cyclone tubes rise spirally from the bottom of the mist and dust removal cylinder to the top of the mist and dust removal cylinder, and the cyclone tubes comprise a plurality of guide pipes and a plurality of cyclone blades respectively connected with the top of the guide pipes; the channel section of the guide pipe is a closed structure, the channel section of the cyclone blade is an open structure, and the open surface faces the steel wire mesh layer; a water bag and a flow resistance sheet are arranged on the section in the guide pipe, and the opening and closing of the flow resistance sheet is controlled by the water amount in the water bag; The steel wire mesh layer is arranged correspondingly with the cyclone blade, and is used for absorbing the flue gas led out by the cyclone blade; The water tank is located below the mist and dust removal cylinder, and the water tank is a telescopic structure; the distance between the water tank and the mist and dust removal cylinder in the vertical direction changes with the telescopic length of the water tank, so as to control the amount of flue gas entering the mist and dust removal cylinder; the telescopic length of the water tank is controlled by the water amount in the water tank.

2. A flue gas treatment apparatus according to claim 1, characterised in that, The water bag comprises a first water bag and a second water bag arranged oppositely on the inner wall of the guide pipe; the first water bag and the second water bag are both provided with a first water outlet and a first water inlet connected with a first water inlet pipe; the water flow of the first water inlet and the first water outlet is controlled by an adjusting valve; The flow resistance sheet comprises a first flow resistance sheet and a second flow resistance sheet stacked; the first flow resistance sheet is provided with at least one first airflow hole, and the second flow resistance sheet is provided with at least one second airflow hole; the two ends of the first flow resistance sheet are respectively in contact with the first water bag and the second water bag, and the two ends of the second flow resistance sheet are respectively in contact with the inner wall of the guide pipe; When the water amount in the first water bag and / or the second water bag changes, the first flow resistance sheet moves on the second flow resistance sheet, so that the relative positions of the first airflow hole and the second airflow hole change, so as to adjust the area of the overlapping region of the first airflow hole and the second airflow hole.

3. A flue gas treatment apparatus according to claim 1, characterised in that, The water tank comprises a water tank top cover, a water tank base, and a water tank wall located between the water tank top cover and the water tank base; the water tank wall is made of flexible and telescopic material; The water tank further comprises a guide rod connecting the water tank top cover and the water tank base, and a guide sleeve fixedly connected to the upper part of the water tank wall and sleeved on the guide rod; when the water tank wall is telescoped, the guide sleeve slides along the guide rod in the vertical direction with the telescoping of the water tank wall; The water tank further comprises a second water inlet connected with a second water inlet pipe, and a second water outlet; the second water inlet and the second water outlet are used for controlling the water amount of the water tank.

4. A flue gas treatment apparatus according to claim 3, characterised in that The mist and dust removal cylinder further comprises a mist and dust removal cylinder guide rod, a mist and dust removal cylinder base, and a conical air inlet; the mist and dust removal cylinder guide rod is fixed in the center of the mist and dust removal cylinder; the conical air inlet is arranged in the mist and dust removal cylinder base; the water tank top cover is a circular truncated cone structure, and the taper of the circular truncated cone structure is consistent with the taper of the conical air inlet.

5. A flue gas treatment apparatus according to claim 1, characterised in that The device further comprises a flushing spray device arranged above the demisting and dust-removing cylinder and a third water inlet pipe connected with the flushing spray device, wherein the flushing spray device is used for flushing the demisting and dust-removing cylinder and the water tank.

6. A flue gas treatment apparatus according to claim 5, characterised in that, The device further comprises a sewage pool arranged at the bottom of the flue gas treatment device, wherein the sewage pool is used for receiving sewage generated by flushing the demisting and dust-removing cylinder and the water tank by the flushing spray device and water flowing out of the water tank and the water tank. The bottom of the sewage pool is connected with a filter used for filtering sludge in the sewage. The sewage pool is connected with a first water outlet pipe used for conveying clean water filtered by the filter to a water storage pool.

7. A flue gas treatment apparatus according to claim 6, characterised in that The device further comprises a liquid level meter used for obtaining water level information in the sewage pool, wherein the liquid level meter determines whether the water level in the sewage pool exceeds an alarm value according to the water level information and controls the overflow pipe to be opened when the water level exceeds the alarm value.

8. A method of flue gas treatment, characterized by The method is applied to the flue gas treatment device of any one of claims 1-7, and the method comprises: obtaining a target rotating speed of a fan in a converter gas passage and determining a target flue gas amount entering the flue gas treatment device according to the target rotating speed; generating a first instruction according to a preset corresponding relationship between the target flue gas amount and a blocking rate of the demisting and dust-removing cylinder and a flue gas passing rate of the demisting and dust-removing cylinder, wherein the first instruction comprises a first blocking rate and a first flue gas passing rate; adjusting water amounts of each of the water tanks according to the first instruction, so that a number of first demisting and dust-removing cylinders blocked by the water tanks reaches a first number, and a ratio of the first number to a total number of the demisting and dust-removing cylinders is the first blocking rate; controlling water amounts of the water bags by adjusting opening and closing states of the flow resistance pieces in each second demisting and dust-removing cylinder according to the first instruction, so that the flue gas passing rates of the guide pipes in each of the demisting and dust-removing cylinders reaches the first flue gas passing rate, wherein the second demisting and dust-removing cylinder is a demisting and dust-removing cylinder that is not blocked; when it is detected that the flue gas amount in the flue gas treatment device is greater than the target flue gas amount, generating a second instruction according to the corresponding relationship, wherein the second instruction comprises a second flue gas passing rate, and the second flue gas passing rate is greater than the first flue gas passing rate; adjusting the opening and closing states of the flow resistance pieces in each of the second demisting and dust-removing cylinders according to the second instruction, so that the flue gas passing rates of the guide pipes in the demisting and dust-removing cylinders reaches the second flue gas passing rate; when it is detected that the flue gas amount in the converter gas passage is less than the target flue gas amount, generating a third instruction according to the corresponding relationship, wherein the third instruction comprises a third flue gas passing rate, and the third flue gas passing rate is less than the first flue gas passing rate; adjusting the opening and closing states of the flow resistance pieces in each of the second demisting and dust-removing cylinders according to the third instruction, so that the flue gas passing rates of the guide pipes in the demisting and dust-removing cylinders reaches the third flue gas passing rate.

9. A flue gas treatment method according to claim 8, characterised in that, when the water amounts in the water tanks reach a maximum value, the demisting and dust-removing cylinders above the water tanks are blocked, and the adjusting of the water amounts of each of the water tanks so that the number of the first demisting and dust-removing cylinders blocked by the water tanks reaches the first number comprises: Determine the number of sumps in which the current water volume is the maximum value, obtain a current number, and determine the difference between the current number and the first number, obtaining a first difference value; If the current number is greater than the first number, open the regulating valve of the second water outlet of the first difference number of sumps to make the water in the first difference number of sumps flow out completely; If the current number is less than the first number, open the regulating valve of the second water inlet of the first difference number of sumps to make the water volume of the first difference number of sumps reach the maximum value.

10. A flue gas treatment method according to claim 8, characterised in that, When the first airflow hole and the second airflow hole in the conduit of the demisting and dust removing cylinder completely overlap, the conduit is open; when the first airflow hole and the second airflow hole in the conduit have no overlapping area, the conduit is closed; the flue gas passage rate is the ratio of the number of open conduits to the total number of conduits in the demisting and dust removing cylinder; by adjusting the opening and closing state of the choke plate in each second demisting and dust removing cylinder, the water volume of the water bag is controlled, so that the flue gas passage rate of the conduit in each demisting and dust removing cylinder reaches the first flue gas passage rate, comprising: Determine the target number of open conduits corresponding to the first flue gas passage rate; Determine the number of conduits in the open state among the plurality of conduits, obtain a current number of open conduits, and determine the difference between the current number of open conduits and the target number, obtaining a second difference value; If the current number of open conduits is greater than the target number, control the water inlet of the second water bag in the second difference number of conduits to be open, the water outlet to be closed, and control the water inlet of the first water bag to be closed and the water outlet to be open, so that the second water bag is elongated; the second water bag pushes the first choke plate to move in the direction of the first water bag during elongation, so that the first airflow hole and the second airflow hole have no overlapping area; If the current number of open conduits is less than the target number, control the water inlet of the first water bag in the second difference number of conduits to be open, the water outlet to be closed, and control the water inlet of the second water bag to be closed and the water outlet to be open, so that the first water bag is elongated; the first water bag pushes the first choke plate to move in the direction of the second water bag during elongation, so that the first airflow hole and the second airflow hole completely overlap.

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