A desulfurization device for sulfur recovery tail gas by complex iron method

Abstract

The application discloses a complex iron method desulfurization device for sulfur recovery tail gas and relates to the technical field of complex iron method desulfurization.The complex iron method desulfurization device comprises a complex iron desulfurization tower, the top of the complex iron desulfurization tower is provided with three groups of mist eliminators, the mist eliminators are provided with high-pressure flushing components, the complex iron desulfurization tower can be connected with the three groups of mist eliminators respectively, the right side of the complex iron desulfurization tower is provided with an air inlet pipe, a four-way valve is arranged on the air inlet pipe, and the four-way valve is connected with the three groups of mist eliminators through three groups of air inlet pipes respectively.Through the alternate use of the three groups of mist eliminators, one group carries out normal desulfurization and mist removal, another group removes impurities from the tail gas, the attached salt crystals (such as ammonium sulfate and thiosulfate) are softened, melted or become crisp, the last group carries out high-strength flushing on the heated mist removal plate, and the softened dirt and particles are completely removed, so that the industry's stubborn problem that the complex iron type desulfurization mist eliminator is prone to blockage is solved.

Description

Technical Field

[0001] This invention relates to the field of desulfurization technology using complexed iron, and specifically to a desulfurization device using complexed iron for sulfur recovery tail gas. Background Technology

[0002] The complexed iron desulfurization technology has been successfully applied in fields such as natural gas desulfurization due to its advantages, including high desulfurization efficiency (H2S can be reduced to below 1 ppmv), fast reaction speed, and the ability to directly convert H2S into valuable elemental sulfur.

[0003] Chinese patent (publication number: CN208413852U) discloses a sulfur recovery device using a complexed iron method, comprising a sulfur storage tank and a hydrogenation reactor. A vent pipe is connected to the bottom of the sulfur storage tank, and one end of the vent pipe is connected to the hydrogenation reactor. The outlet of the hydrogenation reactor is connected to a quench tower via the vent pipe. The outlet of the quench tower is connected to an amine absorption tower via the vent pipe. The outlet of the amine absorption tower is connected to the suction port on one side of a tail gas blower via the vent pipe. The tail gas... One end of the air outlet of the blower is connected to a complexed iron absorption tower via a ventilation pipe. A sulfur slurry transport pipe is connected to the middle of the bottom of the complexed iron absorption tower. One end of the sulfur slurry transport pipe is connected to a complexed regeneration tower. A sulfur slurry pump is connected to the bottom side of the complexed regeneration tower via the sulfur slurry transport pipe. The outlet of the sulfur slurry pump is connected to the top side of the complexed iron absorption tower via the sulfur slurry transport pipe. A tail gas incinerator is connected to the middle of the top of the complexed iron absorption tower via a ventilation pipe. A chimney is connected to the flue gas outlet of the tail gas incinerator.

[0004] The patent and existing technologies have the following technical problems in practical use:

[0005] The aforementioned patent utilizes a complexing iron method to recover sulfur. During the reaction, the gas carries mist containing the complexed iron absorbent liquid. This mist contains iron ions, complexing agents, and fine sulfur particles generated in the reaction. After the mist evaporates, a mixture of elemental sulfur, complexed iron salts, and possible byproduct crystals remains. Sulfur itself is sticky and adheres to solid particles, forming hard scale that is difficult to clean. Traditional methods using high-pressure rinsing have limited cleaning effectiveness. Summary of the Invention

[0006] The purpose of this invention is to provide a desulfurization device for sulfur recovery tail gas using the complexed iron method, in order to solve the above problems.

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A sulfur recovery tail gas desulfurization device using the complexed iron method includes a complexed iron desulfurization tower. The top of the complexed iron desulfurization tower is equipped with three sets of demisters, each with its own high-pressure flushing assembly. The complexed iron desulfurization tower can be connected to the three sets of demisters respectively. An air inlet pipe is provided on the right side of the complexed iron desulfurization tower, and a four-way valve is provided on the air inlet pipe. The four-way valve is connected to the three sets of demisters respectively through three sets of air inlet pipes.

[0009] A heat exchanger is installed on the left side of the complexed iron desulfurization tower. The outlet of the heat exchanger is connected to the inlet of the complexed iron desulfurization tower. The inlet of the heat exchanger is connected to three sets of demisters through three sets of one-way valves and gas outlet pipes.

[0010] Furthermore, the demister includes a shell fixedly installed on the top of the complexed iron desulfurization tower. Inside the shell, there is a demister assembly and two sets of high-pressure flushers, which are located above and below the demister assembly, respectively. An air inlet is provided on the left side of the shell and is connected to an air inlet duct. An air outlet is provided on the right side of the shell and is connected to an air outlet duct. The air inlet is located below the demister assembly, and the air outlet is located above the demister assembly.

[0011] Furthermore, the demisting assembly consists of a lower demisting plate assembly and an upper demisting plate assembly. The lower demisting plate assembly is fixedly installed on the inner wall of the outer casing, and the upper demisting plate assembly slides in a sealed manner with the inner wall of the outer casing. The demisting plates on the lower and upper demisting plate assemblies are staggered, and a lifting hydraulic cylinder is provided between the lower and upper demisting plate assemblies.

[0012] Furthermore, a sealing bellows is provided between the lower demister plate assembly and the upper demister plate assembly.

[0013] Furthermore, a drain pipe is provided on the outer side of the bottom of the outer casing.

[0014] Furthermore, the three sets of demisters are vertically distributed, and adjacent demisters are connected by flanges.

[0015] Furthermore, an exhaust top box is fixedly installed on the top of the uppermost demister, and an exhaust pipe is provided on the outside of the exhaust top box. An inner air pipe is fixedly installed inside the exhaust top box. The top end of the inner air pipe is connected to the exhaust top box. The inner air pipe passes through three sets of demisters and is connected to the complexed iron desulfurization tower at its bottom end. Three sets of first air ports and second air ports are opened on the outside of the inner air pipe. Each set of first air ports and second air ports is located in a set of demisters. The first air port is located below the demister assembly, and the second air port is located above the demister assembly. A first sealing plate, a second sealing plate, and a third sealing plate are arranged sequentially from bottom to top inside the inner air pipe. The first sealing plate, the second sealing plate, and the third sealing plate are respectively located directly above the corresponding first air port. A first guide port is opened through the first sealing plate, a second guide port is opened on the second sealing plate, and a third guide port is opened on the third sealing plate.

[0016] Furthermore, a valve assembly is rotatably installed inside the inner air pipe. The valve assembly, from bottom to top, includes valve pipe one, valve pipe two, valve pipe three, and valve pipe four. Adjacent valve pipes one, two, three, and four are connected by a rotating shaft. A shaft hole is opened at the center of the first, second, and third sealing plates, and the rotating shaft is rotatably installed in the shaft hole. Valve pipe one has a valve port one, and valve pipes two and three each have a valve port one. There is one valve port 1 and one valve port 2. One valve port 2 is opened on valve pipe 4, and the included angle between adjacent valve ports 1 is 60°. The top end of valve pipe 1 and the bottom end of valve pipe 2 are both provided with through hole group 1. The top end of valve pipe 2 and the bottom end of valve pipe 3 are both provided with through hole group 2. The top end of valve pipe 3 and the bottom end of valve pipe 4 are both provided with through hole group 3. The included angle between the two through holes of through hole group 1 and through hole group 3 is 60°. The included angle between the two through holes of through hole group 2 is 120°.

[0017] Furthermore, a drive motor is embedded in the inner top of the inner air pipe, and the output end of the drive motor is connected to the valve pipe assembly.

[0018] Furthermore, a sealing skirt is provided at the bottom of the inner air tube.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention uses three sets of demisters in alternating cycles. One set performs normal demisting during desulfurization, another set removes impurities from the exhaust gas, and the high temperature of the exhaust gas is used to heat the demister plate, softening or loosening the attached salt crystals (such as ammonium sulfate and thiosulfate). The last set performs high-intensity, all-around offline high-pressure water (or chemical agent) flushing on the heated demister plate, thoroughly removing the softened dirt and particles, thus solving the industry problem of easy clogging in complex iron desulfurization demisters.

[0021] This invention utilizes a detachable demister design. During normal demisting, the demister plates are tightly closed, forming a high-density, narrow channel, creating a standard and highly efficient demisting structure with the highest capture efficiency for fine droplets. During exhaust gas purification and high-pressure rinsing, a wide channel, low-density structure is formed between the demister plates. When high-temperature exhaust gas is introduced, the expanded structure significantly reduces airflow resistance, allowing the high-temperature gas to flow quickly and evenly through all plates, achieving efficient and uniform heat exchange and softening crystals. During high-pressure rinsing, the expanded structure allows the high-pressure water jet to directly and unobstructedly impact both surfaces of each plate, achieving thorough cleaning without dead angles. Simultaneously, large pieces of dirt washed off can fall smoothly through the spacious channels without causing blockages. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the demister assembly structure of the present invention;

[0024] Figure 3 This is a cross-sectional view of the demister structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the defogging component structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal airway structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal air pipe and valve pipe assembly structure of the present invention;

[0028] Figure 7 This is a cross-sectional view of the valve assembly of the present invention;

[0029] Figure 8 This is a simplified diagram of the valve assembly ventilation of the present invention.

[0030] Attached reference numerals: 1. Complexed iron desulfurization tower; 2. Inlet pipe; 3. Four-way valve; 4. Inlet duct; 5. Demister; 51. Inlet; 52. Outlet; 53. Drain pipe; 54. Lower demister plate assembly; 55. Lifting hydraulic cylinder; 56. Upper demister plate assembly; 57. Sealing bellows; 58. High-pressure flushing device; 59. Outer shell; 6. Exhaust top box; 7. Exhaust pipe; 8. Outlet duct; 9. Heat exchanger; 10. Inner air pipe; 101. First 102. Second air port; 103. First sealing plate; 104. First guide port; 105. Second sealing plate; 106. Second guide port; 107. Third sealing plate; 108. Third guide port; 11. Valve pipe assembly; 111. Valve pipe one; 112. Valve pipe two; 113. Valve pipe three; 114. Valve pipe four; 115. Valve port one; 116. Valve port two; 117. Through hole assembly one; 118. Through hole assembly two; 119. Through hole assembly three. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1, as Figures 1-8 As shown, a desulfurization device for sulfur recovery tail gas using the complexed iron method includes a complexed iron desulfurization tower 1. Three sets of demisters 5 are installed at the top of the complexed iron desulfurization tower 1. Each demister 5 has its own high-pressure flushing component. The complexed iron desulfurization tower 1 can be connected to the three sets of demisters 5 respectively. An air inlet pipe 2 is installed on the right side of the complexed iron desulfurization tower 1. A four-way valve 3 is installed on the air inlet pipe 2. The four-way valve 3 is connected to the three sets of demisters 5 respectively through three sets of air inlet pipes 4.

[0033] A heat exchanger 9 is installed on the left side of the complexed iron desulfurization tower 1. The outlet of the heat exchanger 9 is connected to the inlet of the complexed iron desulfurization tower 1. The inlet of the heat exchanger 9 is connected to three sets of demisters 5 through three sets of one-way valves and the gas outlet pipe 8. The one-way valves prevent the exhaust gas entering the heat exchanger 9 from flowing back.

[0034] Processing flow: The inlet duct 4 on the used demister 5 is connected to the inlet pipe 2 via the four-way valve 3. The sulfur recovery tail gas enters the demister 5 through the inlet pipe 2 and the inlet duct 4 to remove impurities. Simultaneously, since the temperature of the sulfur recovery tail gas is 120-150℃, its heat is used to heat the demister plate during the impurity removal process, softening or loosening the attached salt crystals (such as ammonium sulfate and thiosulfate). The purified tail gas then enters the heat exchanger through the outlet duct 8. In step 9, the exhaust gas is cooled to the reaction temperature of 40-60℃, and then enters the complexed iron desulfurization tower 1 for desulfurization. The desulfurized flue gas is then demisted by the demister 5, which operates normally. After a period of desulfurization, the demister 5 switches to exhaust gas impurity removal, and then switches to self-cleaning mode. The preheated demister 5 undergoes high-intensity, all-around offline high-pressure water (or chemical agent) flushing to thoroughly remove softened dirt and particles, resulting in high cleaning efficiency. The cleaned demister 5 then switches back to normal demisting. Therefore, the three sets of demisters 5 are used in rotation, automatically switching modes according to a set cycle (e.g., every 8-12 hours) to achieve continuous operation. Regular heat pretreatment and thorough cleaning prevent long-term hardening and accumulation of dirt, maintaining the smoothness of the plate surface. This avoids deep scaling that is difficult to remove with online flushing and reduces mechanical cleaning that could damage equipment due to excessive pressure differential. This improves system stability while ensuring process continuity. It is particularly suitable for harsh operating conditions where "the gas composition is complex, it is easy to crystallize and scale, and the demisting efficiency is required to be continuous and stable" (such as Claus exhaust gas, sticky dust flue gas, and flue gas after wet desulfurization).

[0035] Example 2, based on the above examples, further includes a demister 5 comprising a housing 59 fixedly installed on the top of the complexed iron desulfurization tower 1. The housing 59 contains a demister assembly and two sets of high-pressure flushers 58, which are located above and below the demister assembly, respectively. An air inlet 51 is provided on the left side of the housing 59, which is connected to the air inlet duct 4. An air outlet 52 is provided on the right side of the housing 59, which is connected to the air outlet duct 8. The air inlet 51 is located below the demister assembly, and the air outlet 52 is located above the demister assembly.

[0036] Preferably, a drain pipe 53 is provided on the outer side of the bottom of the outer casing 59.

[0037] Exhaust gas or flue gas enters through inlet 51, passes through the demister assembly from bottom to top, and then exits through outlet 52. Wastewater from the flushing is discharged through drain pipe 53.

[0038] Example 3, based on the above examples, further includes a demisting assembly consisting of a lower demisting plate group 54 and an upper demisting plate group 56. The lower demisting plate group 54 is fixedly installed on the inner wall of the outer casing 59, and the upper demisting plate group 56 slides in a sealed manner with the inner wall of the outer casing 59. The demisting plates on the lower demisting plate group 54 and the upper demisting plate group 56 are staggered. A lifting hydraulic cylinder 55 is provided between the lower demisting plate group 54 and the upper demisting plate group 56.

[0039] Preferably, a sealing bellows 57 is provided between the lower demister assembly 54 and the upper demister assembly 56. By providing the sealing bellows 57, the sealing bellows 57 can improve the sealing performance between the upper demister assembly 56 and the lower demister assembly 54 when they are far apart.

[0040] During normal demisting, the upper demisting plate group 56 and the lower demisting plate group 54 are brought together, and the upper demisting plates are staggered and inserted. The demisting plates are arranged closely to form a high-density, narrow channel, forming a standard and efficient demisting structure with the highest efficiency in capturing fine droplets.

[0041] During exhaust gas impurity removal, the lifting hydraulic cylinder 55 pushes the upper demister plate group 56 and the lower demister plate group 54 to separate, forming a wide channel and low density structure between the demister plates. When high-temperature exhaust gas is introduced, the unfolded structure greatly reduces airflow resistance, allowing the high-temperature gas to flow quickly and evenly through all plates, achieving efficient and uniform heat exchange and softening crystals.

[0042] During high-pressure rinsing, the upper demister plate assembly 56 and the lower demister plate assembly 54 remain separated, allowing the high-pressure water jet to directly and unobstructedly impact both surfaces of each plate, achieving thorough cleaning without dead angles. At the same time, large pieces of dirt washed off can fall smoothly through the spacious channels without causing blockages.

[0043] Example 4, based on the above examples, further includes three sets of demisters 5 vertically distributed, with adjacent demisters 5 connected by flanges. This ensures stable installation and high sealing performance.

[0044] Preferably, an exhaust top box 6 is fixedly installed on the top of the uppermost demister 5. An exhaust pipe 7 is provided on the outside of the exhaust top box 6. An inner air pipe 10 is fixedly installed inside the exhaust top box 6. The top end of the inner air pipe 10 is connected to the exhaust top box 6. The inner air pipe 10 passes through three sets of demisters 5 and is connected to the complexed iron desulfurization tower 1 at its bottom end. Three sets of first air ports 101 and second air ports 102 are opened on the outside of the inner air pipe 10. Each set of first air ports 101 and second air ports 102 is located in one set of demisters 5, and the first air port 101 is located in the... Below the fogging assembly, the second air inlet 102 is located above the defogging assembly. Inside the inner air pipe 10, from bottom to top, there are a first sealing plate 103, a second sealing plate 105, and a third sealing plate 107. The first sealing plate 103, the second sealing plate 105, and the third sealing plate 107 are respectively located directly above the corresponding first air inlet 101. A first guide port 104 is provided through the first sealing plate 103, a second guide port 106 is provided on the second sealing plate 105, and a third guide port 108 is provided on the third sealing plate 107.

[0045] In this embodiment, the first air port 101, the second air port 102, the first guide port 104, the second guide port 106 and the third guide port 108 can be controlled by conventional solenoid valves.

[0046] Normal demisting of the bottom demister 5: The bottom set of first air inlets 101 and second air inlets 102 are open (the other two sets remain closed), the first guide port 104 is closed, and the second guide port 106 and third guide port 108 are open. The desulfurized flue gas enters the inner gas pipe 10. Under the obstruction of the first sealing plate 103, the flue gas enters the bottom demister 5 through the bottom set of first air inlets 101. After passing through the demisting assembly, the flue gas enters the inner gas pipe 10 through the bottom set of second air inlets 102. The demisted flue gas rises along the second guide port 106 and the third guide port 108, and then is guided into the exhaust top box 6 through the inner gas pipe 10, and finally discharged through the exhaust pipe 7.

[0047] The intermediate demister 5 needs to perform normal demisting: the first air port 101 and the second air port 102 of the intermediate group are open (the other two groups remain closed), the first guide port 104 and the third guide port 108 are open, and the second guide port 106 is closed. The desulfurized flue gas enters the inner gas pipe 10. The flue gas rises through the first guide port 104. Under the obstruction of the second sealing plate 105, the flue gas enters the intermediate demister 5 through the first air port 101 of the intermediate group. After passing through the demisting component, the flue gas enters the inner gas pipe 10 through the second air port 102 of the intermediate group. The demisted flue gas rises along the third guide port 108 of the demisted flue gas, and then is guided into the exhaust top box 6 through the inner gas pipe 10, and finally discharged through the exhaust pipe 7.

[0048] Normal demisting of the topmost demister 5: The topmost first air port 101 and second air port 102 are open (the other two sets remain closed), the first guide port 104 and second guide port 106 are open, and the third guide port 108 is closed. The desulfurized flue gas enters the inner gas pipe 10. The flue gas rises through the first guide port 104 and second guide port 106. Under the blocking effect of the third sealing plate 107, the flue gas enters the topmost demister 5 through the topmost first air port 101. After passing through the demisting assembly, the flue gas enters the inner gas pipe 10 through the topmost second air port 102. The demisted flue gas is guided into the exhaust top box 6 through the inner gas pipe 10 and finally discharged through the exhaust pipe 7.

[0049] Therefore, through the layout of this embodiment, the demister 5 can be vertically stacked, reducing the horizontal space occupied. At the same time, a single connecting pipe can be used to connect the demister 5 to the complexed iron desulfurization tower 1, saving piping.

[0050] Example 5, based on the above examples, further includes a valve assembly 11 rotatably installed inside the inner air pipe 10. The valve assembly 11, from bottom to top, includes valve pipe one 111, valve pipe two 112, valve pipe three 113, and valve pipe four 114. Adjacent valve pipes one 111, two 112, three 113, and four 114 are connected by a rotating shaft. A shaft hole is opened at the center of the first sealing plate 103, the second sealing plate 105, and the third sealing plate 107. The rotating shaft is rotatably installed in the shaft hole. A valve port one 115 is opened on valve pipe one 111, and valve ports two 112 and three 113 are also provided with valve ports one 115. A valve port 115 and a valve port 116 are provided. A valve port 116 is provided on valve pipe 114. The included angle between adjacent valve ports 115 is 60°. A through hole group 117 is provided at the top of valve pipe 111 and the bottom of valve pipe 112. A through hole group 218 is provided at the top of valve pipe 112 and the bottom of valve pipe 113. A through hole group 319 is provided at the top of valve pipe 113 and the bottom of valve pipe 114. The included angle between the two through holes of through hole group 117 and through hole group 319 is 60°. The included angle between the two through holes of through hole group 218 is 120°.

[0051] Preferably, a drive motor is embedded in the top of the inner gas pipe 10, and the output end of the drive motor is connected to the valve pipe assembly 11. This prevents the drive motor from contacting the flue gas.

[0052] Preferably, the bottom of the inner air pipe 10 is provided with a sealing skirt, and the seal between the bottommost demister 5 and the bottom of the inner air pipe 10 is good.

[0053] This embodiment adopts an integrated design, eliminating the need for multiple solenoid valves. Compared to the previous embodiment, it does not require a complex control system, thus reducing manufacturing costs.

[0054] The bottom demister 5 performs normal demisting: the drive motor drives the valve assembly 11 to rotate. At this time, the bottom valve port 115 and valve port 116 rotate to correspond with the bottom first air port 101 and second air port 102 (the other two sets are misaligned). At the same time, the through hole assembly 117, through hole assembly 2 118 and through hole assembly 3 119 rotate to the positions shown in the attached diagram. Figure 8 As shown, through-hole group 117 is misaligned with the first guide port 104 (the first guide port 104 is closed), through-hole group 2 118 and through-hole group 3 119 correspond to the second guide port 106 and the third guide port 108 respectively (the second guide port 106 and the third guide port 108 are open). The desulfurized flue gas enters the inner gas pipe 10. Under the blocking action of the first sealing plate 103, the flue gas enters the lowest demister 5 through the lowest first gas port 101. After passing through the demister assembly, the flue gas enters the inner gas pipe 10 through the lowest second gas port 102. The demistered flue gas rises along the second guide port 106 and the third guide port 108, and then is guided into the exhaust top box 6 through the inner gas pipe 10, and finally discharged through the exhaust pipe 7.

[0055] The intermediate demister 5 needs to perform normal demisting: the drive motor drives the valve tube assembly 11 to rotate 60° clockwise, the intermediate valve port 115 and valve port 2 116 rotate to correspond with the first air port 101 and the second air port 102 of the intermediate group (the other two groups are misaligned), the through hole group 2 118 is misaligned with the second guide port 106 (the second guide port 106 is closed), the through hole group 117 and through hole group 3 119 correspond with the first guide port 104 and the third guide port 108 respectively (the first guide port 104 and the third guide port 108 are misaligned). (08 Open), the desulfurized flue gas enters the inner gas pipe 10. The flue gas rises through the first guide port 104. Under the obstruction of the second sealing plate 105, the flue gas enters the intermediate demister 5 through the middle first gas port 101. After passing through the demister assembly, the flue gas enters the inner gas pipe 10 through the middle second gas port 102. The demisted flue gas rises along the demisted flue gas third guide port 108, and then is guided into the exhaust top box 6 through the inner gas pipe 10, and finally discharged through the exhaust pipe 7.

[0056] The topmost demister 5 performs normal demisting: the drive motor drives the valve assembly 11 to rotate 60° clockwise, the topmost valve port 115 and valve port 2 116 rotate to correspond with the topmost first air port 101 and second air port 102 (the other two sets are misaligned), the through-hole assembly 3 119 rotates to misalign with the third guide port 108 (the third guide port 108 is closed), and the through-hole assembly 117 and through-hole assembly 2 118 correspond to the first guide port 104 and the second guide port 106 respectively (the first guide port 104... (With the second inlet 106 open), the desulfurized flue gas enters the inner gas pipe 10. The flue gas rises through the first inlet 104 and the second inlet 106. Under the obstruction of the third sealing plate 107, the flue gas enters the uppermost demister 5 through the uppermost first gas inlet 101. After passing through the demister assembly, the flue gas enters the inner gas pipe 10 through the uppermost second gas inlet 102. The demisted flue gas is guided into the exhaust top box 6 through the inner gas pipe 10 and finally discharged through the exhaust pipe 7.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A complex iron method desulfurization device for sulfur recovery tail gas, comprising a complex iron desulfurization tower (1), characterized in that, The top of the complex iron desulfurization tower (1) is provided with three groups of mist eliminators (5), the mist eliminators (5) are provided with high-pressure flushing components, the complex iron desulfurization tower (1) can be connected with the three groups of mist eliminators (5) respectively, the right side of the complex iron desulfurization tower (1) is provided with an air inlet pipe (2), the air inlet pipe (2) is provided with a four-way valve (3), the four-way valve (3) is connected with the three groups of mist eliminators (5) through three groups of air inlet pipes (4) respectively; The left side of the complex iron desulfurization tower (1) is provided with a heat exchanger (9), the outlet of the heat exchanger (9) is connected with the inlet of the complex iron desulfurization tower (1), the inlet of the heat exchanger (9) is connected with the three groups of mist eliminators (5) through three groups of one-way valves and air outlet pipes (8) respectively; The three groups of mist eliminators (5) are vertically distributed, and adjacent mist eliminators (5) are connected through flanges, the top of the uppermost mist eliminator (5) is fixedly installed with an exhaust top box (6), the outer side of the exhaust top box (6) is provided with an exhaust pipe (7), the inside of the exhaust top box (6) is fixedly installed with an inner air pipe (10), the top end of the inner air pipe (10) is connected with the exhaust top box (6), the inner air pipe (10) penetrates through the three groups of mist eliminators (5), and the bottom end is connected with the complex iron desulfurization tower (1), the outer side of the inner air pipe (10) is provided with three groups of first air ports (101) and second air ports (102), each group of first air ports (101) and second air ports (102) is located in a group of mist eliminators (5), and the first air port (101) is located below the mist removal assembly, and the second air port (102) is located above the mist removal assembly, the inside of the inner air pipe (10) is sequentially provided with a first blocking plate (103), a second blocking plate (105) and a third blocking plate (107) from bottom to top, the first blocking plate (103), the second blocking plate (105) and the third blocking plate (107) are located above the corresponding first air port (101) respectively, the first blocking plate (103) is provided with a first guide port (104) penetratingly, the second blocking plate (105) is provided with a second guide port (106), and the third blocking plate (107) is provided with a third guide port (108).

2. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 1, characterized in that, The mist eliminator (5) comprises an outer shell (59) fixedly installed at the top of the complex iron desulfurization tower (1), the inside of the outer shell (59) is provided with a mist removal assembly and two groups of high-pressure flushing devices (58), the two groups of high-pressure flushing devices (58) are located above and below the mist removal assembly respectively, the left side of the outer shell (59) is provided with an air inlet (51), the air inlet (51) is connected with the air inlet pipe (4), the right side of the outer shell (59) is provided with an air outlet (52), the air outlet (52) is connected with the air outlet pipe (8), the air inlet (51) is located below the mist removal assembly, and the air outlet (52) is located above the mist removal assembly.

3. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 2, characterized in that, The demisting assembly consists of a lower demisting plate assembly (54) and an upper demisting plate assembly (56). The lower demisting plate assembly (54) is fixedly installed on the inner wall of the outer shell (59). The upper demisting plate assembly (56) slides in a sealed manner with the inner wall of the outer shell (59). The demisting plates on the lower demisting plate assembly (54) and the upper demisting plate assembly (56) are staggered. A lifting hydraulic cylinder (55) is provided between the lower demisting plate assembly (54) and the upper demisting plate assembly (56).

4. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 3, characterized in that, A sealing bellows (57) is provided between the lower demister plate assembly (54) and the upper demister plate assembly (56).

5. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 4, characterized in that, A drain pipe (53) is provided on the outer side of the bottom of the outer casing (59).

6. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 1, characterized in that, The inner air pipe (10) is rotatably mounted with a valve assembly (11). The valve assembly (11) includes, from bottom to top, valve pipe one (111), valve pipe two (112), valve pipe three (113), and valve pipe four (114). Adjacent valve pipes one (111), valve pipe two (112), valve pipe three (113), and valve pipe four (114) are connected by a rotating shaft. The center of the first sealing plate (103), the second sealing plate (105), and the third sealing plate (107) are all provided with a shaft hole. The rotating shaft is rotatably mounted in the shaft hole. A valve port one (115) is provided on valve pipe one (111), and a valve port is provided on valve pipe two (112) and valve pipe three (113). A valve is provided on a valve tube (115) and a valve port (116). A valve port (116) is provided on a valve tube (114). The included angle between adjacent valve ports (115) is 60°. A through hole group (117) is provided at the top of the valve tube (111) and the bottom of the valve tube (112). A through hole group (118) is provided at the top of the valve tube (112) and the bottom of the valve tube (113). A through hole group (119) is provided at the top of the valve tube (113) and the bottom of the valve tube (114). The included angle between the two through holes of the through hole group (117) and the through hole group (119) is 60°. The included angle between the two through holes of the through hole group (118) is 120°.

7. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 6, characterized in that, The inner top of the inner air pipe (10) is fitted with a drive motor, and the output end of the drive motor is connected to the valve pipe group (11).

8. The complex iron method desulfurization device for sulfur recovery tail gas according to claim 7, characterized in that, The bottom of the inner air tube (10) is provided with a sealing skirt.

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