Desulfurization and dust removal wastewater recovery treatment system

Abstract

The invention discloses a desulfurization and dust removal wastewater recovery treatment system, which relates to the technical field of flue gas recovery treatment, and comprises a desulfurizer adding device, a spraying device, a desulfurization reaction tower and a dust removal device, the lower end of the desulfurization reaction tower is connected with a flue gas inlet, and the flue gas inlet is connected with a spiral reaction unit arranged in the desulfurization reaction tower; the spiral reaction unit comprises at least one group of spiral reaction tubes fixedly arranged in the desulfurization reaction tower, a lower barrier plate with one end fixedly connected with the lower ends of the spiral reaction tubes, and an upper barrier plate with one end connected with the upper ends of the spiral reaction tubes; the desulfurizing agent adding device comprises a desulfurizing agent storage bin, a conveying pump and at least one group of discharging mechanisms; the discharging mechanism comprises a discharging unit connected with the conveying pump and at least one group of charging pipes extending into the spiral reaction pipe; the spraying device comprises a spraying unit and a plurality of groups of spraying pipes extending into the spiral reaction pipe; the loss of the desulfurizing agent is reduced, and the desulfurization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to flue gas recovery and treatment, and in particular to a desulfurization and dust removal wastewater recovery and treatment system. Background Art

[0002] Desulfurization and dust removal wastewater is the wastewater generated by the use of desulfurization and dust removal technologies in the power, steel, chemical and other industries. The composition of this wastewater is complex and usually contains a large amount of soluble solids, suspended matter, heavy metal ions and other pollutants. If it is discharged directly without treatment, it will have a serious impact on the environment. Therefore, establishing an efficient wastewater recycling and treatment system is an important research topic in the industry.

[0003] At present, there are three main types of flue gas desulfurization technologies: wet, dry, and semi-dry. Among them, the wet method has high desulfurization efficiency and fast desulfurization reaction speed, but there are problems such as serious equipment corrosion, high maintenance costs, and secondary pollution. Although the dry method does not require wastewater treatment and will not cause corrosion to the equipment, its desulfurization efficiency is between 70% and 80%. Semi-dry desulfurization is a relatively economical and efficient desulfurization method, which mainly removes sulfur dioxide (SO2) contained in the flue gas by spraying limestone or lime slurry into the flue gas. 2 ), in this process, the desulfurizer and SO 2 A chemical reaction occurs, producing solid by-products (such as gypsum).

[0004] In actual operation, semi-dry desulfurization will also produce a certain amount of wastewater, which is usually generated in the process of desulfurizer preparation, gas washing and equipment cooling. The treatment of wastewater generated by semi-dry desulfurization can be carried out through the following steps: pretreatment stage, remove fine particles that have not yet precipitated through mechanical filtration devices to reduce the burden of subsequent treatment; chemical treatment stage, adjust the pH value of the wastewater by adding acid or alkali, usually converting it to neutral for subsequent treatment, and then add flocculants to aggregate and precipitate suspended solids, thereby improving the removal rate of solid matter; biological treatment stage, establish a bioreactor, use microorganisms to degrade organic matter, and further improve water quality; membrane separation technology stage, use membrane separation technology to separate heavy metal ions and other soluble solids in water, retain clean water, and reuse it for desulfurization process or other purposes; solid by-product treatment stage, through the above-mentioned wastewater treatment steps, the collected solid matter (such as precipitates and flocculants) can usually be processed into commercial by-products such as gypsum and heavy metals.

[0005] However, when the existing flue gas desulfurization equipment is in use, the desulfurizer and flue gas in the flue are not mixed evenly, the residence time of the desulfurizer and flue gas in the equipment is short, and the desulfurizer loss is large, all of which reduce the desulfurization efficiency of the equipment. Summary of the invention

[0006] In order to solve the defects of the prior art, the present invention provides a desulfurization and dust removal wastewater recovery and treatment system.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] The present invention provides a desulfurization and dust removal wastewater recovery and treatment system, comprising a desulfurization agent dosing device, a spraying device, a desulfurization reaction tower and a dust removal device;

[0009] The lower end of the desulfurization reaction tower is connected to a flue gas inlet, and the flue gas inlet is connected to a spiral reaction unit arranged inside the desulfurization reaction tower;

[0010] The spiral reaction unit comprises at least one group of spiral reaction tubes fixedly arranged inside the desulfurization reaction tower, a lower blocking plate having one end fixedly connected to the lower end of the spiral reaction tube, and an upper blocking plate having one end connected to the upper end of the spiral reaction tube;

[0011] The desulfurizing agent dosing device comprises a desulfurizing agent storage bin, a delivery pump and at least one set of feeding mechanisms;

[0012] The feeding mechanism comprises a feeding unit connected to the delivery pump and at least one group of feeding pipes extending into the interior of the spiral reaction tube;

[0013] The spray device comprises a spray unit and a plurality of spray pipes extending into the interior of the spiral reaction tube.

[0014] As a preferred technical solution of the present invention, a plurality of groups of the spiral reaction tubes are arranged in a staggered manner, and the height of each of the spiral reaction tubes is the same.

[0015] As a preferred technical solution of the present invention, the lower baffle plate and the upper baffle plate are used to fill the gap between the sulfidation reaction tower and the spiral reaction tube.

[0016] As a preferred technical solution of the present invention, the feeding tube extends upwardly into the interior of the spiral reaction tube at an inclination angle of 15°-75° relative to the horizontal plane.

[0017] As a preferred technical solution of the present invention, sealing structures are provided at the connection positions between the spiral reaction tube and the lower baffle plate and the upper baffle plate.

[0018] As a preferred technical solution of the present invention, the number of the feeding tubes is 2-40.

[0019] As a preferred technical solution of the present invention, the dust removal device includes a flue gas pretreatment unit connected to the flue gas outlet, a bag dust collector connected to the flue gas pretreatment unit, and an ash hopper connected to the flue gas pretreatment unit and the bag dust collector respectively.

[0020] As a preferred technical solution of the present invention, a shaking device is further provided inside the desulfurization reaction tower, which is used to discharge the solid product remaining inside the spiral reaction tube out of the spiral reaction tube.

[0021] As a preferred technical solution of the present invention, the shaking device includes:

[0022] A rotating rod is arranged inside the desulfurization reaction tower and installed between the plurality of spiral reaction tubes, and a plurality of elastic protrusions are arranged on the outer side of the rotating rod and are fitted with the outer walls of the spiral reaction tubes;

[0023] A support rod, at least one group of which is provided and one end of which is fixedly connected to the desulfurization reaction tower and the other end of which is rotatably connected to the rotating rod;

[0024] A first transmission wheel, fixedly disposed at one end of the rotating rod and transmission-connected to the second transmission wheel via a transmission belt;

[0025] Bevel gear pair, the second transmission wheel is transmission connected to the driving unit through the bevel gear pair.

[0026] A method for recycling and treating desulfurization and dust removal wastewater comprises the following steps:

[0027] Step 1, sending the sulfur-containing flue gas into the interior of the high-temperature sulfurization reaction tower along the flue gas inlet, and entering the interior of the spiral reaction tube along the lower baffle plate;

[0028] Step 2: Driven by a delivery pump, the desulfurizer is pumped from the desulfurizer storage bin into a plurality of unloading units, and the desulfurizer is distributed to a plurality of feeding pipes through the unloading units;

[0029] Step 3: When the desulfurizer enters the sulfidation reaction tower along the feeding pipe, the spray unit works and humidifies the flue gas inside the sulfidation reaction tower;

[0030] Step 4: The flue gas entering the spiral reaction tube reacts with the aqueous solution containing the desulfurizer, and the liquid droplets evaporate under heat to form solid particles, which then react with the sulfide in the flue gas;

[0031] Step 5: After the reactants are discharged from the spiral reaction tube, they are collected in the flue gas pretreatment unit and the bag filter, thereby achieving the desulfurization effect.

[0032] The beneficial effects of the present invention are:

[0033] In the present invention, a spiral reaction unit is arranged inside the desulfurization reaction tower, and the spiral reaction unit includes a plurality of spiral reaction tubes. When the flue gas enters the spiral reaction tubes for reaction, it spirally rises inside the spiral reaction tubes. On the one hand, the residence time of the flue gas is increased without changing the volume of the reaction tower. On the other hand, when the flue gas flows inside the spiral reaction tubes, a certain turbulence effect is also generated, thereby increasing the contact effect between the flue gas and the desulfurizer, making the mixing of the flue gas and the desulfurizer more uniform, thereby improving the gas-solid flow environment, increasing the gas-solid contact efficiency, improving the use efficiency of the desulfurizer, reducing the loss of the desulfurizer, and increasing the desulfurization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0035] In the attached picture:

[0036] Figure 1 It is a process flow chart of the present invention.

[0037] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0038] Figure 3 It is a schematic diagram of the structure of the spiral reaction unit and the shaking device.

[0039] Figure 4 A partial schematic diagram of the spiral reaction unit.

[0040] In the figure: 1. desulfurization agent dosing device; 11. desulfurization agent storage bin; 12. delivery pump; 13. unloading mechanism; 131. unloading unit; 132. feeding pipe; 2. spray device; 21. spray unit; 22. spray pipe; 3. desulfurization reaction tower; 4. dust removal device; 41. flue gas pretreatment unit; 42. bag filter; 43. ash hopper; 5. spiral reaction unit; 51. spiral reaction tube; 52. lower baffle plate; 53. upper baffle plate; 6. shaking device; 61. rotating rod; 62. elastic protrusion; 63. support rod; 64. first transmission wheel; 65. transmission belt; 66. second transmission wheel; 67. bevel gear pair; 68. driving unit; 7. flue gas inlet; 8. flue gas outlet. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0042] Embodiment 1

[0043] like Figure 1-Figure 4 As shown, a desulfurization and dust removal wastewater recovery and treatment system includes a desulfurization agent dosing device 1, a spraying device 2, a desulfurization reaction tower 3 and a dust removal device 4;

[0044] The lower end of the desulfurization reaction tower 3 is connected to a flue gas inlet 7, and the flue gas inlet 7 is connected to a spiral reaction unit 5 arranged inside the desulfurization reaction tower 3;

[0045] The spiral reaction unit 5 includes at least one set of spiral reaction tubes 51 fixedly arranged inside the desulfurization reaction tower 3, a lower blocking plate 52 having one end fixedly connected to the lower end of the spiral reaction tube 51, and an upper blocking plate 53 having one end connected to the upper end of the spiral reaction tube 51;

[0046] The desulfurizing agent dosing device 1 comprises a desulfurizing agent storage bin 11, a delivery pump 12 and at least one set of feeding mechanisms 13;

[0047] The feeding mechanism 13 includes a feeding unit 131 connected to the delivery pump 12 and at least one set of feeding pipes 132 extending into the interior of the spiral reaction tube 51;

[0048] The spray device 2 includes a spray unit 21 and a plurality of spray pipes 22 extending into the spiral reaction tube 51 .

[0049] Among them, in the present invention, a spiral reaction unit 5 is arranged inside the desulfurization reaction tower 3, and the spiral reaction unit 5 includes a plurality of spiral reaction tubes 51. When the flue gas enters the spiral reaction tube 51 for reaction, it will spirally rise inside the spiral reaction tube 51. On the one hand, the residence time of the flue gas is increased without changing the volume of the reaction tower. On the other hand, when the flue gas flows inside the spiral reaction tube 51, a certain turbulence effect is also generated, thereby increasing the contact effect between the flue gas and the desulfurizer, making the mixing of the flue gas and the desulfurizer more uniform, thereby improving the gas-solid flow environment, increasing the gas-solid contact efficiency, improving the use efficiency of the desulfurizer, reducing the loss of the desulfurizer, and increasing the desulfurization efficiency.

[0050] Preferably, in this embodiment, the spiral reaction tubes 51 are arranged in four groups, and the four groups of spiral reaction tubes 51 are intertwined and orderly arranged inside the desulfurization reaction tower 3. The lower blocking plate 52 and the upper blocking plate 53 are used to fill the gap between the sulfurization reaction tower and the spiral reaction tubes 51. In this way, after the flue gas enters the interior of the desulfurization reaction tower 3 along the flue gas inlet 7 and is blocked by the lower blocking plate 52, it will only enter the interior of the spiral reaction tubes 51. At the same time, the flue gas enters along the lower blocking plate 52, which can increase the uniformity of the airflow, ensure the uniform distribution of the flue gas in the entire reaction tower, and enhance the contact efficiency with the desulfurizer;

[0051] The feeding mechanism 13 can be set to multiple groups, which are used to increase the number of feeding pipes 132 extending into the spiral reaction tube 51, so that the desulfurizer can be added simultaneously from multiple different positions of the spiral reaction tube 51. Optionally, the number of feeding pipes 132 is 2-40, so that the desulfurizer can be evenly filled into the spiral reaction tube 51, thereby ensuring the mixing uniformity of the desulfurizer and the flue gas and improving the separation efficiency. The feeding unit 131 is mainly used to distribute the desulfurizer to the feeding pipe 132;

[0052] Similarly, the spray unit 21 is mainly used to distribute the spray liquid to the multiple spray pipes 22 .

[0053] Further, if Figure 3-Figure 4 As shown, multiple groups of the spiral reaction tubes 51 are staggered, and the height of each of the spiral reaction tubes 51 is the same, and the outer wall of the spiral reaction tube 51 is arranged in contact with the inner wall of the desulfurization reaction tower 3. This arrangement can ensure the stability of the spiral reaction tube 51 installed inside the desulfurization reaction tower 3. At the same time, it can reduce the gap between the spiral reaction tube 51 and the desulfurization reaction tower 3, thereby improving the space utilization inside the desulfurization reaction tower 3.

[0054] Further, if Figure 1-Figure 2 As shown, the feeding pipe 132 extends upwardly into the interior of the spiral reaction tube 51 at an angle of 15°-75° relative to the horizontal plane. Considering that the flue gas will spiral upward after entering the spiral reaction tube 51, adding the desulfurizer obliquely upward into the spiral reaction tube 51 helps the desulfurizer to diffuse quickly in the spiral reaction tube 51, which is beneficial to the rapid and uniform mixing of the desulfurizer and the flue gas.

[0055] Furthermore, a sealing structure is provided at the connection position between the spiral reaction tube 51 and the lower baffle plate 52 and the upper baffle plate 53, so as to prevent the flue gas from entering the gap between the spiral reaction tube 51 and the desulfurization reaction tower 3 along the gap between the lower baffle plate 52 and the spiral reaction tube 51, so as to ensure the desulfurization effect of the flue gas. The sealing structure can be welded to the connection position between the spiral reaction tube 51 and the lower baffle plate 52 and the upper baffle plate 53. At the same time, the lower baffle plate 52 and the upper baffle plate 53 fixed inside the desulfurization reaction tower 3 can also provide a good support effect for the spiral reaction tube 51.

[0056] Further, if Figure 1As shown, the dust removal device 4 includes a flue gas pretreatment unit 41 connected to the flue gas outlet 8, a bag dust collector 42 connected to the flue gas pretreatment unit 41, and an ash hopper 43 connected to the flue gas pretreatment unit 41 and the bag dust collector 42, respectively. The flue gas pretreatment unit 41 is used to preliminarily remove larger particles, reduce the flue gas temperature, and ensure the stable operation of subsequent processing equipment. The bag dust collector 42 can finely capture the remaining solid particles in the flue gas and the by-products generated by the reaction. The bag dust collector 42 has a high-efficiency filtering capability and can effectively remove solid particles with a particle size of microns. The flue gas after multiple processing steps will greatly reduce its sulfur dioxide content and meet environmental emission standards. The purified flue gas can be discharged from the chimney.

[0057] Further, if Figure 1-Figure 3 As shown, the desulfurization reaction tower 3 is further provided with a shaking device 6, which is used to discharge the solid product remaining in the spiral reaction tube 51 out of the spiral reaction tube 51. The shaking device 6 includes:

[0058] The rotating rod 61 is arranged inside the desulfurization reaction tower 3 and installed between the multiple groups of spiral reaction tubes 51. The outer side of the rotating rod 61 is provided with multiple groups of elastic protrusions 62 that are arranged in contact with the outer wall of the spiral reaction tube 51.

[0059] At least one group of support rods 63 is provided, one end of which is fixedly connected to the desulfurization reaction tower 3, and the other end is rotatably connected to the rotating rod 61;

[0060] The first transmission wheel 64 is fixedly disposed at one end of the rotating rod 61 and is transmission-connected to the second transmission wheel 66 via a transmission belt 65;

[0061] The bevel gear pair 67 , through which the second transmission wheel 66 is transmission-connected to the driving unit 68 .

[0062] Among them, by setting a shaking device 6 to cooperate with the spiral reaction tube 51, when the spiral reaction tube 51 is working, the shaking device 6 can apply a shaking effect to the side walls of multiple spiral reaction tubes 51, thereby quickly discharging solid products and other substances accumulated inside the spiral reaction tube 51.

[0063] In detail, when working, the driving unit 68 works and drives the bevel gear pair 67 to work. The bevel gear pair 67 will drive the transmission belt 65 to rotate through the second transmission wheel 66 and then drive the first transmission wheel 64 to rotate. The first transmission wheel 64 will drive the support rod 63 to rotate. The multiple elastic protrusions 62 arranged on the support rod 63 will alternately hit the outer wall of the spiral reaction tube 51 to accelerate the rapid discharge of objects accumulated inside the spiral reaction tube 51.

[0064] Embodiment 2

[0065] The components that are the same or corresponding to those in the first embodiment are marked with the same reference numerals as those in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0066] A method for recycling and treating desulfurization and dust removal wastewater is also provided, comprising the following steps:

[0067] Step 1: The sulfur-containing flue gas is sent into the interior of the high-temperature vulcanization reaction tower along the flue gas inlet 7, and enters the interior of the spiral reaction tube 51 along the lower baffle plate 52. The temperature inside the vulcanization reaction tower is controlled between 900° C. and 1100° C. The interior of the reaction tower is maintained at a relatively high temperature to promote the rate of the vulcanization reaction.

[0068] Step 2: Driven by the delivery pump 12, the desulfurizer is pumped from the desulfurizer storage bin 11 into the multiple unloading units 131, and the desulfurizer is delivered to the multiple feeding pipes 132 through the unloading units 131. The multiple unloading units 131 can adjust the delivery amount of the desulfurizer as needed to meet the requirements of the reaction process. The desulfurizer is further dispersed through the multiple feeding pipes 132 to enhance the contact surface with the flue gas, thereby improving the desulfurization efficiency;

[0069] Step 3: When the desulfurizer enters the sulfidation reaction tower along the feeding pipe 132, the spray unit 21 works and humidifies the flue gas inside the sulfidation reaction tower. The humidified flue gas can reduce the temperature and increase the activity of the desulfurizer, providing a better environment for the evaporation and reaction of the droplets. The spray system evenly disperses the desulfurizer droplets in the flue gas to ensure a more complete chemical reaction.

[0070] Step 4: The flue gas entering the spiral reaction tube 51 reacts with the aqueous solution containing the desulfurizer, and the liquid droplets evaporate under heat to form solid particles, which then react with the sulfide in the flue gas. The liquid droplets evaporate under heat to form solid particles, and the liquid is quickly converted into gas. The solid particles react chemically with the sulfide (such as SO2) in the flue gas to generate harmless solid products (such as gypsum);

[0071] Step 5: After the reactants are discharged from the spiral reaction tube 51, they are sequentially collected in the flue gas pretreatment unit 41 and the bag filter 42, thereby achieving the desulfurization effect.

[0072] It should be noted that the wastewater treatment process generated by desulfurization of flue gas using the method of the present invention is a prior art and will not be described in detail here.

[0073] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A desulfurization and dust removal wastewater recovery and treatment system, characterized in that: It comprises a desulfurizing agent dosing device (1), a spraying device (2), a desulfurizing reaction tower (3) and a dust removal device (4); The lower end of the desulfurization reaction tower (3) is connected to a flue gas inlet (7), and the flue gas inlet (7) is connected to a spiral reaction unit (5) arranged inside the desulfurization reaction tower (3); The spiral reaction unit (5) comprises at least one group of spiral reaction tubes (51) fixedly arranged inside the desulfurization reaction tower (3), a lower blocking plate (52) one end of which is fixedly connected to the lower end of the spiral reaction tube (51), and an upper blocking plate (53) one end of which is connected to the upper end of the spiral reaction tube (51); The desulfurizing agent dosing device (1) comprises a desulfurizing agent storage bin (11), a delivery pump (12) and at least one set of feeding mechanisms (13); The unloading mechanism (13) comprises a unloading unit (131) connected to the delivery pump (12) and at least one group of feeding pipes (132) extending into the interior of the spiral reaction tube (51); The spray device (2) comprises a spray unit (21) and a plurality of spray pipes (22) extending into the interior of the spiral reaction tube (51).

2. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The plurality of groups of spiral reaction tubes (51) are arranged in a staggered manner, and the height of each of the spiral reaction tubes (51) is the same.

3. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The lower blocking plate (52) and the upper blocking plate (53) are used to fill the gap between the sulfidation reaction tower and the spiral reaction tube (51).

4. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The feeding pipe (132) extends upwardly into the interior of the spiral reaction tube (51) at an inclination angle of 15°-75° relative to the horizontal plane.

5. A desulfurization and dust removal wastewater recovery and treatment system according to claim 5, characterized in that: Sealing structures are provided at the connection positions between the spiral reaction tube (51) and the lower blocking plate (52) and the upper blocking plate (53).

6. A desulfurization and dust removal wastewater recovery and treatment system according to claim 6, characterized in that: The number of the feeding tubes (132) is 2-40.

7. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The dust removal device (4) comprises a flue gas pretreatment unit (41) connected to a flue gas outlet (8), a bag filter (42) connected to the flue gas pretreatment unit (41), and an ash hopper (43) respectively connected to the flue gas pretreatment unit (41) and the bag filter (42).

8. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The desulfurization reaction tower (3) is also provided with a shaking device (6) for discharging the solid product remaining in the spiral reaction tube (51) out of the spiral reaction tube (51).

9. A desulfurization and dust removal wastewater recovery and treatment system according to claim 1, characterized in that: The shaking device (6) comprises: A rotating rod (61) is arranged inside the desulfurization reaction tower (3) and installed between the plurality of spiral reaction tubes (51); the outer side of the rotating rod (61) is provided with a plurality of elastic protrusions (62) which are arranged in contact with the outer wall of the spiral reaction tube (51); At least one group of support rods (63) is provided, one end of which is fixedly connected to the desulfurization reaction tower (3) and the other end of which is rotatably connected to the rotating rod (61); A first transmission wheel (64) is fixedly arranged at one end of the rotating rod (61) and is transmission-connected to the second transmission wheel (66) via a transmission belt (65); A bevel gear pair (67), wherein the second transmission wheel (66) is transmission-connected to a driving unit (68) via the bevel gear pair (67).

10. A recycling method for desulfurization and dust removal wastewater recycling system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, sending the sulfur-containing flue gas into the interior of the high-temperature sulfurization reaction tower along the flue gas inlet (7), and entering the interior of the spiral reaction tube (51) along the lower baffle plate (52); Step 2: Driven by the delivery pump (12), the desulfurizer is pumped from the desulfurizer storage bin (11) into a plurality of unloading units (131), and the desulfurizer is distributed to a plurality of feeding pipes (132) through the unloading units (131); Step 3: When the desulfurizing agent enters the sulfidation reaction tower along the feeding pipe (132), the spray unit (21) works and humidifies the flue gas inside the sulfidation reaction tower; Step 4, the flue gas entering the spiral reaction tube (51) reacts with the aqueous solution containing the desulfurizer, and the liquid droplets evaporate under heat to form solid particles, which then react with the sulfide in the flue gas; Step 5: After the reactants are discharged from the spiral reaction tube (51), they are sequentially collected in the flue gas pretreatment unit (41) and the bag filter (42), thereby achieving a desulfurization effect.

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