Flue gas purification device and system

Abstract

The utility model relates to the technical field of flue gas purification, in particular to a flue gas purification device and system.The flue gas purification device comprises a desulfurization tower, a flue gas purification device and a flue gas purification system, and the desulfurization tower comprises a raw flue gas inlet formed in the middle of the desulfurization tower and a purified flue gas pipe arranged on the upper portion of the desulfurization tower; a spraying layer and a mist spraying layer are also arranged between the original flue gas inlet and the purified flue gas pipe; a slurry pond is arranged at the bottom of the desulfurization tower, and carbide slag slurry is contained in the slurry pond; the spraying mechanism is arranged on the spraying layer, the spraying mechanism is connected with carbide slag slurry contained in the slurry pond through a first pipeline, and a slurry circulating pump is arranged on the first pipeline; and the spraying mechanism is arranged on the spraying layer. According to the flue gas purification device, the mist spraying mechanism and the spraying mechanism are sequentially arranged in the desulfurization tower in the flowing direction of the flue gas to be purified, the carbide slag slurry is sprayed through atomization and liquefaction, sulfur trioxide is firstly removed through the alkaline carbide slag slurry, and then sulfur dioxide and heavy metal ions are removed; therefore, the flue gas purification capability and the flue gas purification effect are improved.

Description

Technical Field

[0001] This application relates to the field of flue gas purification technology, and in particular to a flue gas purification device and system. Background Technology

[0002] Calcium carbide is the main industrial raw material for the production of acetylene. However, the production process generates a large amount of industrial waste—calcium carbide slag. Currently, the treatment methods for calcium carbide slag both domestically and internationally involve dehydration followed by centralized stockpiling and landfilling. This method consumes a large amount of land resources and causes a series of social problems, including environmental pollution. Calcium carbide slag is a byproduct of acetylene production using calcium carbide as a raw material. Its main component is calcium hydroxide, which has a strong neutralizing ability for acidic gases. Therefore, it is used as a desulfurizing agent in industry, but its effectiveness is not ideal due to various reasons.

[0003] Currently, wet flue gas desulfurization technology, which has mature processes, dominates the domestic flue gas desulfurization technology sector. However, based on years of actual operation, many problems still exist.

[0004] First, due to the limitations of the spray characteristics of desulfurization towers, the removal effect of desulfurization towers on sulfur trioxide is very limited, with almost no effect on removing sulfur trioxide; second, in the face of increasingly stringent environmental protection requirements, it is difficult to ensure that SO2 emissions meet standards by using desulfurizing agents alone, especially in high-sulfur coal areas. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a flue gas purification device and system.

[0006] In a first aspect, embodiments of the present invention provide a flue gas purification device, the device comprising:

[0007] The desulfurization tower includes a raw flue gas inlet located in the middle of the desulfurization tower and a clean flue gas pipe located at the top; a spray layer and a mist layer are also provided between the raw flue gas inlet and the clean flue gas pipe; the bottom of the desulfurization tower has a slurry pool, which contains carbide slag slurry.

[0008] A spraying mechanism is located in the spraying layer. The spraying mechanism is connected to the slurry tank containing carbide slag slurry through a first pipeline. A slurry circulation pump is installed on the first pipeline.

[0009] The spray mechanism is located in the spray layer;

[0010] The spray slurry tank includes an upper layer of low-concentration carbide slag slurry. The upper part of the spray slurry tank is connected to the spraying mechanism through a second pipeline. A filter and a spray slurry pump are sequentially installed on the second pipeline along the direction from the spray slurry tank to the desulfurization tower.

[0011] In conjunction with the first aspect, the spray layer is located above the mist layer.

[0012] In conjunction with the first aspect, the device also includes: a carbide slag slurry tank, which is connected to the desulfurization tower via a third pipeline, and a carbide slag slurry pump is installed on the third pipeline.

[0013] In conjunction with the first aspect, the top of the calcium carbide slag slurry tank is equipped with a calcium carbide slag slurry feed hopper, and a filter screen is also installed on the fourth pipeline between the calcium carbide slag slurry feed hopper and the calcium carbide slag slurry tank.

[0014] In conjunction with the first aspect, the spray slurry tank also includes a high-concentration calcium carbide slag slurry. The bottom of the spray slurry tank is connected to the desulfurization tower via a fifth pipeline, which is equipped with a concentrated slurry discharge pump.

[0015] In conjunction with the first aspect, the device also includes:

[0016] The gypsum hydrocyclone is connected to the spray slurry tank via the sixth pipeline and to the desulfurization tower via the seventh pipeline; a gypsum discharge pump is installed on the seventh pipeline.

[0017] In conjunction with the first aspect, the device also includes:

[0018] The conveying mechanism is connected at one end to the outlet of the gypsum hydrocyclone and at the other end to the inlet of the gypsum storage device.

[0019] In conjunction with the first aspect, the device also includes:

[0020] The wastewater treatment device is connected to the outlet of the gypsum hydrocyclone.

[0021] In conjunction with the first aspect, the device also includes:

[0022] The synergist solution tank is connected to the desulfurization tower via the ninth pipeline, which is equipped with a synergist feed pump. The synergist solution tank is also connected to the synergist metering and feeding mechanism via the tenth pipeline.

[0023] Secondly, this application provides a flue gas purification system, including the flue gas purification device as described above.

[0024] The present invention provides the following beneficial effects: The present invention provides a flue gas purification device and system, the device comprising: a desulfurization tower, including a raw flue gas inlet located in the middle of the desulfurization tower and a clean flue gas pipe located at the top; a spray layer and a misting layer are further provided between the raw flue gas inlet and the clean flue gas pipe; a slurry pool at the bottom of the desulfurization tower, the slurry pool containing carbide slag slurry; a spraying mechanism located at the spraying layer, the spraying mechanism and the carbide slag slurry in the slurry pool being connected via a first pipeline, the first pipeline being equipped with a slurry circulation pump; a misting mechanism located at the misting layer; and a misting slurry tank, including an upper layer of low-concentration carbide slag slurry, the upper part of the misting slurry tank being connected to the misting mechanism via a second pipeline, the second pipeline being sequentially equipped with a filter and a misting slurry pump along the direction from the misting slurry tank to the desulfurization tower.

[0025] The flue gas purification device provided in this application has a spraying mechanism and a spraying mechanism arranged sequentially in the flue gas flow direction to be purified in the desulfurization tower. By atomizing and liquefying the calcium carbide slag slurry, the alkaline calcium carbide slag slurry first removes sulfur trioxide and then removes sulfur dioxide and heavy metal ions, thereby improving the flue gas purification capacity and effect.

[0026] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the flue gas purification device provided in an embodiment of the present utility model;

[0030] Figure 2 A flow chart for flue gas purification is provided as an example.

[0031] Figure label:

[0032] 1-Desulfurization tower, 11-Raw flue gas inlet, 12-Clean flue gas pipe, 13-Slurry pool;

[0033] 2-Spraying mechanism, 21-First pipeline, 22-Slurry circulation pump;

[0034] 3-Spraying mechanism;

[0035] 4-Spray slurry tank, 41-Second pipeline, 42-Filter, 43-Spray slurry pump, 44-Fifth pipeline, 45-Thick slurry discharge pump;

[0036] 5-Calcium carbide slag slurry tank, 51-Third pipeline, 52-Calcium carbide slag slurry pump;

[0037] 6-Calcium carbide slag slurry feed hopper, 61-Fourth pipeline, 62-Filter screen;

[0038] 7-Gypsum hydrocyclone, 71-Sixth pipeline, 72-Seventh pipeline, 73-Gypsum discharge pump;

[0039] 8-Conveying mechanism, 81-Gypsum storage device, 82-Wastewater treatment device;

[0040] 9-Potential enhancer solution tank, 91-Ninth pipeline, 92-Potential enhancer feed pump, 93-Tenth pipeline, 94-Potential enhancer metering and feeding mechanism. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] To facilitate understanding of this embodiment, the application scenarios and design concepts of this application embodiment will be briefly introduced below.

[0043] Example 1

[0044] Therefore, the purpose of this utility model is to provide a flue gas purification device and a flue gas purification system.

[0045] Firstly, this utility model embodiment provides a flue gas purification device, combined with Figure 1 As shown, the device includes: a desulfurization tower 1, a spraying mechanism 2, a spraying mechanism 3, and a spray slurry tank 4.

[0046] The desulfurization tower 1 includes a raw flue gas inlet 11 located in the middle of the desulfurization tower and a clean flue gas pipe 12 located at the top; a spray layer and a mist layer are also provided between the raw flue gas inlet 11 and the clean flue gas pipe 12; the bottom of the desulfurization tower 1 has a slurry pool 13, which contains carbide slag slurry.

[0047] The spraying mechanism 2 is located in the spraying layer. The spraying mechanism 2 is connected to the carbide slag slurry in the slurry tank 13 through the first pipeline 21. The first pipeline 21 is equipped with a slurry circulation pump 22.

[0048] Spraying mechanism 3 is located in the spray layer.

[0049] The spray slurry tank 4 includes an upper layer of low-concentration carbide slag slurry. The upper part of the spray slurry tank 4 is connected to the spraying mechanism 3 through a second pipeline 41. A filter 42 and a spray slurry pump 43 are sequentially arranged on the second pipeline 41 along the direction from the spray slurry tank 4 to the desulfurization tower 1.

[0050] In this application, flue gas enters the desulfurization tower 1 through the original flue gas inlet 11. Under the action of the spray mechanism 3 and the scrubbing mechanism 2, the flue gas uses calcium carbide slag slurry as a desulfurizing agent to jointly remove sulfur trioxide, sulfur dioxide and heavy metal ions from the flue gas. The purified flue gas is discharged through the clean flue gas pipe 12. The structure is reasonable and compact. Under the action of spraying and scrubbing, it can fully contact the flue gas and jointly remove sulfur trioxide, sulfur dioxide and heavy metal ions, thereby improving the flue gas purification effect.

[0051] Specifically, in combination Figure 1The solid arrow points in the middle. It is worth noting that in this application, the flue gas entering the desulfurization tower 1 from the original flue gas inlet 11 must first pass through the spray zone. The low-concentration slurry in the upper layer of the spray slurry tank 4 is supplied to the spray mechanism 3 through the second pipeline 41 by the spray slurry pump 43. The small-diameter spray mechanism 3 sprays the low-concentration slurry in the form of atomization to remove sulfur trioxide from the flue gas. The specific reaction process is divided into two parts. One part of the sulfur trioxide reacts directly with calcium hydroxide to generate calcium sulfate: Ca(OH)2 + SO3 = CaSO4; the other part of the sulfur trioxide dissolves in water to become sulfuric acid: H2O + SO3 = H2SO4. After the sulfuric acid falls into the slurry pool, it reacts with calcium hydroxide to generate calcium sulfate dihydrate, i.e., gypsum: Ca(OH)2 + H2SO4 = CaSO4·2H2O. Afterwards, the flue gas continues to flow upwards, and the slurry, under the action of the slurry circulation pump 22, is supplied to the spraying mechanism 2. The spraying mechanism 2 sprays the slurry to contact the sulfur dioxide and heavy metal ions in the flue gas. The sprayed sulfur dioxide and heavy metal ions fall to the lower part of the desulfurization tower 1 under the action of gravity and are carried into the slurry pool to undergo a chemical reaction: SO2 + H2O = H2SO3. Subsequently, it reacts with calcium hydroxide in the slurry to produce calcium sulfite: H2SO3 + Ca(OH)2 = CaSO3 + 2H2O. Calcium sulfite then reacts with oxygen and water to produce calcium sulfate dihydrate, i.e., gypsum. Specifically: Finally, the purified gas is discharged through the clean flue gas pipe 12.

[0052] In this way, the flue gas enters through the original flue gas inlet 11, where sulfur trioxide is first removed by the spray mechanism 3, and then sulfur dioxide and heavy metal ions are removed by the spraying action. Compared with existing flue gas treatment devices, the desulfurization tower 1 in this embodiment adds a spray layer, which can greatly improve the removal efficiency of sulfur trioxide by the desulfurization tower 1. The spray slurry is taken from the upper liquid surface of the upper spray slurry tank 4 and contains a low concentration of calcium carbide slag slurry. It will not clog the nozzles of the spray mechanism 3 and has a certain alkaline component, which can better absorb sulfur trioxide in the flue gas. In addition, to further avoid clogging of the nozzles of the spray mechanism 3, a filter 42 is added to the second pipeline 41 to filter the low concentration of calcium carbide slag slurry before guiding it to the spray mechanism 3.

[0053] During the flue gas desulfurization and heavy metal ion removal process, the pH value inside the desulfurization tower 1 is kept stable at 5-6. In this embodiment, the preferred pH value is 5.3±0.3. The density of the carbide slag slurry is controlled and the generated products (i.e., gypsum slurry) are discharged in a timely manner.

[0054] In conjunction with the first aspect, the spray layer is located above the mist layer.

[0055] With the spray mechanism 3 located below the spraying mechanism 2, the raw flue gas entering the desulfurization tower 1 first passes through the spray mechanism 3 to remove sulfur trioxide, and then passes through the spraying mechanism 2. The atomized low-concentration carbide slag slurry has a large contact area with the flue gas, which slows down the flow rate of the flue gas and makes full contact with the flue gas to remove sulfur trioxide first and then remove sulfur dioxide and heavy metal ions, thereby improving the flue gas purification efficiency.

[0056] In conjunction with the first aspect, the device also includes: a carbide slag slurry tank 5, which is connected to the desulfurization tower 1 via a third pipeline 51, and a carbide slag slurry pump 52 is installed on the third pipeline 51.

[0057] The calcium carbide slag slurry in the calcium carbide slag slurry tank 5 is guided as a desulfurizing agent through the third pipeline 51 to the slurry pool 13 in the desulfurization tower 1 by the calcium carbide slag slurry pump 52. In this way, the use of calcium carbide slag as a desulfurizing agent achieves the purpose of "turning waste into treasure", which is conducive to solving the problem of calcium carbide slag treatment and can save a lot of land resources.

[0058] In conjunction with the first aspect, the top of the calcium carbide slag slurry tank 5 is provided with a calcium carbide slag slurry feed hopper 6, and a filter screen 62 is also provided on the fourth pipeline 61 between the calcium carbide slag slurry feed hopper 6 and the calcium carbide slag slurry tank 5.

[0059] The calcium carbide slag slurry feed hopper 6 feeds the calcium carbide slag slurry tank 5. After filtration by the filter screen 62, impurities in the calcium carbide slag are removed, mainly granular impurities such as CaC2, coke particles, and clay lumps. Then, a calcium carbide slag slurry with a concentration of 20%-40% (preferably 25% in this embodiment) is prepared in the calcium carbide slag slurry tank 5, with a calcium hydroxide concentration of 80%-90% (preferably 85% in this embodiment). This slurry is then pumped into the desulfurization tower 1 via the calcium carbide slag slurry pump 52, using the calcium carbide slag slurry as a desulfurizing agent to achieve the goal of "turning waste into treasure".

[0060] In conjunction with the first aspect, the spray slurry tank 4 also includes a high-concentration carbide slag slurry. The bottom of the spray slurry tank 4 is connected to the desulfurization tower 1 through a fifth pipeline 44, and a concentrated slurry discharge pump 45 is installed on the fifth pipeline 44.

[0061] In this embodiment, the low-concentration calcium carbide slag slurry in the upper layer of the spray slurry tank 4 is drawn out by the spray slurry pump 43 and sprayed into the desulfurization tower 1 through the spray mechanism 3 of the spray layer. The high-concentration calcium carbide slag slurry at the bottom is returned to the slurry pool 13 in the lower part of the desulfurization tower 1 by the thick slurry discharge pump 45 at the bottom.

[0062] In conjunction with the first aspect, the device also includes:

[0063] The gypsum hydrocyclone 7 is connected to the spray slurry tank 4 via the sixth pipe 71 and to the desulfurization tower 1 via the seventh pipe 72; a gypsum discharge pump 73 is installed on the seventh pipe 72.

[0064] The products generated by the chemical reaction in the desulfurization tower 1 are discharged along the seventh pipeline 72 to the gypsum hydrocyclone 7 by the gypsum discharge pump 73. When the gypsum hydrocyclone 7 is running, the centrifugal force generated by the high speed of rotation causes the denser solids to move towards the inner wall of the gypsum hydrocyclone 7 and flow downward along the inner wall and finally be discharged from the bottom, while the lighter liquid flows upward through the central part and is discharged from the top overflow port.

[0065] In addition, the gypsum hydrocyclone 7 is connected to the spray slurry tank 4 through the sixth pipe 71. In this way, the supernatant separated and stored by the gypsum hydrocyclone 7 during high-speed rotation flows back to the spray slurry tank 4 along the sixth pipe 71 to replenish the spray slurry tank 4 with calcium carbide slurry for recycling.

[0066] In conjunction with the first aspect, the device also includes:

[0067] The conveying mechanism 8 has one end connected to the outlet of the gypsum hydrocyclone 7 and the other end connected to the inlet of the gypsum storage device 81.

[0068] In this embodiment, the conveying mechanism 8 is a belt conveyor, including a drive unit, conveyor belt, idlers, and a frame. The drive unit typically includes a motor, reducer, and drive roller, providing power. The conveyor belt is a strip-shaped component used to carry and transport materials, and can be made of materials such as rubber, plastic, or fabric. Idler rollers support the conveyor belt, reducing friction and maintaining its smooth operation. The frame supports the entire conveyor structure, maintaining its stability. After the motor starts, the reducer converts high-speed rotation into low-speed, high-torque rotation, driving the drive roller to rotate and move the conveyor belt. Supported by the idlers, the conveyor belt runs along a predetermined path. Material is added to the conveyor belt from the inlet (connected to the outlet of the gypsum hydrocyclone 7 in this application). During its movement, the conveyor belt transports the material from the inlet to the outlet (connected to the inlet of the gypsum storage device 81 in this application). Alternatively, the conveying mechanism can also be a chain conveyor, screw conveyor, roller conveyor, etc. These conveying mechanisms 8 are common conveying structures and will not be described in detail here.

[0069] The underflow separated and discharged by the gypsum hydrocyclone 7 is transported to the conveying mechanism 8. During the conveying process, it is dehydrated by the action of the gaps opened on the conveyor belt, and the resulting finished gypsum is transported to the gypsum storage device 81.

[0070] In conjunction with the first aspect, the device also includes:

[0071] Wastewater treatment device 82 is connected to the outlet of gypsum hydrocyclone 7.

[0072] Because the sulfuric acid and nitric acid produced during the reaction in the desulfurization tower 1 have a washing and capturing effect on heavy metal ions in the flue gas, the heavy metal ions in the flue gas are transferred to the wastewater. The waste liquid dehydrated in the sixth conveying process of the gypsum hydrocyclone 7 is guided to the wastewater treatment device 82 for further wastewater treatment to achieve the purpose of removing heavy metal ions.

[0073] In the gypsum dehydration and wastewater treatment process, the byproducts generated during flue gas purification in desulfurization tower 1 are discharged through gypsum discharge pump 73. Under the high-speed rotation of gypsum hydrocyclone 7, the supernatant (low-concentration calcium carbide slag slurry) enters the spray slurry tank 4 through the sixth pipeline 71. The upper layer of low-concentration calcium carbide slag slurry in spray slurry tank 4 is transported to the spray layer through filter 42 and spray slurry pump 43 and sprayed out in an atomized state. To ensure the effectiveness of sulfur trioxide capture in the spray layer, the spray mechanism 3 uses a single-fluid atomizing nozzle with an orifice diameter of 200um and an average atomized particle diameter of 50um. Filter 42 uses a 120-mesh filter screen to ensure that the nozzles will not be clogged. The spray mechanism 2 of the spray layer is set with 3 layers of nozzles, and the nozzles are hollow spiral nozzles made of silicon carbide nitride material. Spray mechanism 2 and spray mechanism 3 are relatively common structures, which can spray calcium carbide slurry in liquid and solid forms respectively during operation, and will not be described in detail here.

[0074] In this embodiment, the underflow from the gypsum hydrocyclone 7 is conveyed to the conveying mechanism 8 for dehydration to produce finished gypsum. Due to the combined removal effect of carbide slag and synergist, the wastewater contains a large amount of heavy metal ions. After conventional treatment by the wastewater treatment device 82, the concentration of heavy metal ions in the wastewater meets the standard, and the treated wastewater is recycled.

[0075] In conjunction with the first aspect, the device also includes:

[0076] The synergist solution tank 9 is connected to the desulfurization tower 1 via the ninth pipeline 91. The ninth pipeline 91 is equipped with a synergist feed pump 92. The synergist solution tank 9 is also connected to the synergist metering and feeding mechanism 94 via the tenth pipeline 93.

[0077] By adding an synergist to desulfurization tower 1, the combined use of carbide slag and the synergist can be achieved, which can promote the reduction of heavy metal ions M. 0 Oxidized to M 2+ The reaction, M 2+ The heavy metal ions are dissolved and absorbed by the calcium carbide slurry, thus achieving the purpose of removing heavy metal ions. In this way, not only is the desulfurization efficiency of the system improved, but heavy metal ions are also removed simultaneously, which plays a positive role in reducing pollutant emissions.

[0078] During the addition of the synergist, the synergist is metered by the synergist metering and feeding mechanism 94 and added to the synergist solution tank 9. Then, it is transported to the desulfurization tower 1 through the synergist feed pump 92 along the ninth pipeline 91. The initial addition concentration is 1500mg / L-2000mg / L, and then the addition concentration is gradually reduced. After the system is running stably, the concentration of the synergist in the desulfurization tower 1 is maintained at 500mg / L-1000mg / L.

[0079] Understandably, all of the above components (such as spraying mechanism 2, slurry circulation pump 22, spraying mechanism 3, filter 42, spray slurry pump 43, thick slurry discharge pump 45, carbide slag slurry pump 52, carbide slag slurry feed hopper 6, filter screen 62, gypsum hydrocyclone 7, gypsum discharge pump 73, wastewater treatment device 82, synergist feed pump 92, synergist metering and feeding mechanism 94, etc.) are connected to corresponding drive devices to drive the operation of each component, which will not be elaborated here.

[0080] Combination Figure 2 As shown, the specific working process can be divided into four processes: S100, pretreatment of carbide slag and preparation of slurry; S120, addition of synergist; S130, flue gas desulfurization and removal of heavy metal ions; S140, gypsum dewatering and wastewater treatment.

[0081] Specifically, in the process of calcium carbide slag pretreatment and slurry preparation, calcium carbide slag slurry is fed by the feed hopper 6, and impurities in the calcium carbide slag are removed by the filter screen 62, mainly removing particulate impurities such as CaC2, coke particles and clay lumps; calcium carbide slag slurry with a concentration of 25% is prepared in the calcium carbide slag slurry tank 5, so that the calcium hydroxide concentration is 85%, and then sent to the desulfurization tower 1 by the calcium carbide slag slurry pump 52.

[0082] During the addition of the synergist, the synergist is metered by the synergist metering and feeding mechanism 94 and added to the synergist solution tank 9. Then, it is added to the desulfurization tower 1 through the synergist feed pump 92. The initial addition concentration is 1500 mg / L, and then the addition concentration is gradually reduced. After the system is running stably, the concentration of the synergist in the desulfurization tower is maintained at 500 mg / L.

[0083] During the flue gas desulfurization and heavy metal ion removal process, the pH value inside desulfurization tower 1 is kept stable at around 5.3. The slurry density is controlled and the gypsum slurry is discharged in a timely manner.

[0084] In the process of gypsum dehydration and wastewater treatment, the gypsum slurry discharged by the gypsum discharge pump 73 first passes through the gypsum hydrocyclone 7, and the supernatant enters the spray slurry tank 4 through the sixth pipeline 71. The low-concentration carbide slag slurry in the upper layer of the spray slurry tank 4 is transported to the spray layer through the filter 42 and the spray slurry pump 43 and sprayed out in an atomized state.

[0085] The underflow from the gypsum hydrocyclone 7 is conveyed to the conveying mechanism 8 (a vacuum belt conveyor in this example) for dehydration and to produce finished gypsum. Due to the combined removal effect of carbide slag and synergist, the wastewater contains a large amount of heavy metal ions. After conventional treatment by the wastewater treatment device 82, the concentration of heavy metal ions in the wastewater meets the standards, and the treated wastewater is recycled.

[0086] Secondly, this application provides a flue gas purification system, including the flue gas purification device as described above.

[0087] During the flue gas purification process, the contact range between the alkaline carbide slag slurry and the flue gas is increased through atomization and liquefaction spraying to fully remove sulfur trioxide, sulfur dioxide and heavy metal ions, thereby improving the flue gas purification efficiency.

[0088] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0089] Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0090] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0091] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A flue gas purification device, characterized in that, include: The desulfurization tower includes a raw flue gas inlet located in the middle of the desulfurization tower and a clean flue gas pipe located at the top; a spray layer and a mist layer are also provided between the raw flue gas inlet and the clean flue gas pipe; the bottom of the desulfurization tower has a slurry tank, which contains carbide slag slurry. A spraying mechanism is provided on the spraying layer. The spraying mechanism is connected to the slurry tank containing carbide slag slurry through a first pipeline. A slurry circulation pump is provided on the first pipeline. A spray mechanism is provided on the spray layer; The spray slurry tank includes an upper layer of low-concentration carbide slag slurry. The upper part of the spray slurry tank is connected to the spraying mechanism through a second pipeline. A filter and a spray slurry pump are sequentially arranged on the second pipeline along the direction from the spray slurry tank to the desulfurization tower.

2. The apparatus according to claim 1, characterized in that, The spray layer is located above the spray layer.

3. The apparatus according to claim 1, characterized in that, The device also includes a carbide slag slurry tank, which is connected to the desulfurization tower via a third pipeline, and a carbide slag slurry pump is installed on the third pipeline.

4. The apparatus according to claim 3, characterized in that, The top of the calcium carbide slag slurry tank is equipped with a calcium carbide slag slurry feed hopper, and a filter screen is also installed on the fourth pipeline between the calcium carbide slag slurry feed hopper and the calcium carbide slag slurry tank.

5. The apparatus according to claim 1, characterized in that, The spray slurry tank also contains a high-concentration calcium carbide slag slurry. The bottom of the spray slurry tank is connected to the desulfurization tower via a fifth pipeline, and a concentrated slurry discharge pump is installed on the fifth pipeline.

6. The apparatus according to claim 1, characterized in that, The device further includes: A gypsum hydrocyclone is connected to the spray slurry tank via a sixth pipeline and to the desulfurization tower via a seventh pipeline; a gypsum discharge pump is installed on the seventh pipeline.

7. The apparatus according to claim 6, characterized in that, The device further includes: A conveying mechanism, one end of which is connected to the outlet of the gypsum hydrocyclone, and the other end of which is connected to the inlet of the gypsum storage device.

8. The apparatus according to claim 6, characterized in that, The device further includes: The wastewater treatment device is connected to the outlet of the gypsum hydrocyclone.

9. The apparatus according to claim 4, characterized in that, The device further includes: The synergist solution tank is connected to the desulfurization tower via a ninth pipeline, on which a synergist feed pump is installed. The synergist solution tank is also connected to a synergist metering and feeding mechanism via a tenth pipeline.

10. A flue gas purification system, characterized in that, Includes the flue gas purification device as described in any one of claims 1-9.

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