A sulfur foam acid generation pretreatment system and pretreatment method

Abstract

The application relates to a sulfur foam acid production pretreatment system and a pretreatment method, and belongs to the field of industrial acid production. The system comprises, in sequence, a demulsification stirring tank, a hot melt separation device, an evaporation crystallization device, a drying device and a sulfur particle granulator. The hot melt separation device comprises a hot melt shell, a heat supply unit and a stirring unit. A feeding port is arranged at the top of the hot melt shell. The demulsification stirring tank is communicated with the feeding port. An overflow port and a discharge port are sequentially arranged on the side wall of the hot melt shell from top to bottom. Sealing doors and first valves are arranged at the overflow port and the discharge port respectively. The evaporation crystallization device is communicated with the discharge port. The heat supply unit is arranged on the hot melt shell. The stirring unit is arranged in the hot melt shell. The stirring unit is used for stirring sulfur foam in the hot melt shell. The application has the technical effects that the sulfur foam treatment system is simple and convenient to operate.

Description

Technical Field

[0001] This application relates to the technical field of industrial acid production, and in particular to a sulfur foam acid production pretreatment system and pretreatment method. Background Technology

[0002] Sulfur foam is a typical hazardous waste generated in industrial processes such as coking, coal gas purification, and wet desulfurization. Its core component is elemental sulfur (usually 30%-70%), and it also contains tar and moisture. Direct discharge would cause serious pollution. Existing sulfur foam acid production pretreatment systems are complex, requiring step-by-step treatment of the sulfur foam through demulsification mixing tanks, gravity settling tanks, centrifuges, filtration equipment, evaporation crystallization devices, drying devices, hot melt kettles, and sulfur particle granulators.

[0003] Patent (202223465176.3) discloses a coking desulfurization wastewater and a liquid sulfur incineration technology for acid production. The raw material pretreatment device includes a sulfur foam separator, a slurry tank, a sulfur melting tower, a clear liquid separation device, a liquid sulfur separator, and a clear liquid evaporation and concentration system. The sulfur foam from the desulfurization unit is fed into the sulfur foam separator. Part of the desulfurization liquid separated by the sulfur foam separator is returned to the desulfurization unit, and part is sent to the slurry tank. The sulfur paste separated by the sulfur foam separator is sent to the slurry tank. The outlet of the slurry tank is connected to the sulfur melting tower. The supernatant of the sulfur melting tower is sent to the clear liquid separation device. The sulfur outlet at the bottom of the sulfur melting tower is connected to the liquid sulfur separator. The supernatant of the clear liquid separation device is sent to the clear liquid evaporation and concentration system. In the above patent, the separation of sulfur, tar, and water requires multiple stages of equipment, and the separation system is complex.

[0004] Regarding the aforementioned technologies, the inventors believe that there is a drawback: the connection relationships in the sulfur foam separation system are complex. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a sulfur foam acid production pretreatment system and pretreatment method.

[0006] This application provides a sulfur foam acid production pretreatment system, which adopts the following technical solution: A sulfur foam acid production pretreatment system includes a demulsifying stirring tank, a hot-melt separation device, an evaporation crystallization device, a drying device, and a sulfur particle granulator connected in sequence. The hot-melt separation device includes a hot-melt shell, a heating unit, and a stirring unit. A feed inlet is provided at the top of the hot-melt shell. The demulsifying stirring tank is connected to the feed inlet. An overflow port and a discharge port are sequentially provided on the side wall of the hot-melt shell from top to bottom. A sealing door and a first valve are respectively provided at the overflow port and the discharge port. The evaporation crystallization device is connected to the discharge port. The heating unit is mounted on the hot-melt shell. The stirring unit is located inside the hot-melt shell. The stirring unit is used to stir the sulfur foam inside the hot-melt shell.

[0007] By adopting the above technical solution, the demulsification stirring tank first performs preliminary demulsification on the sulfur foam, causing the sulfur particles in the sulfur foam to agglomerate and initially separating the sulfur particles from the tar; the heating unit of the hot melt separation device melts the sulfur in the sulfur foam to form liquid sulfur, and the stirring unit can ensure that the material in the hot melt shell is heated evenly, avoiding local agglomeration, and allowing the sulfur to be completely separated from water and tar; the separated tar and water are discharged through the overflow port; the liquid sulfur at the bottom is discharged from the discharge port, reducing the impurity treatment load of subsequent evaporation and crystallization; the drying device and sulfur particle granulator convert the pretreated sulfur into standardized raw materials, improving resource utilization; by setting up the hot melt separation device, the need to set up gravity settling tanks, centrifuge equipment and filtration equipment can be avoided, simplifying the sulfur foam pretreatment process.

[0008] Preferably, the heat-fused shell includes an inner shell and an outer shell; a heat-fused gap exists between the inner shell and the outer shell; and the heating unit is coiled within the heat-fused gap.

[0009] Preferably, the heating unit includes a heating water tank and a heating pipe; the heating pipe is coiled in the heat-fusion gap; and both ends of the heating pipe are respectively connected to the heating water tank.

[0010] Preferably, the stirring unit includes a flow equalization box, a stirring tube, a connecting pipe, and a pressurizing pump; the flow equalization box is located at the bottom of the inner shell; the flow equalization box has a flow equalization cavity; the stirring tube is vertically arranged on the flow equalization box and communicates with the flow equalization cavity; a plurality of injection ports are provided on the side wall of the stirring tube; one end of the connecting pipe communicates with the top of the inner shell, and the other end communicates with the flow equalization cavity; a second valve is provided at the connection between the flow equalization cavity and the connecting pipe; the pressurizing pump is located inside the connecting pipe.

[0011] By adopting the above technical solution, a pressure pump is installed in the connecting pipe to pressurize the water vapor, and the pressurized water vapor is discharged into the liquid sulfur through the flow equalization box, which plays a role in stirring the liquid sulfur. This allows the water in the sulfur foam to be fully utilized, eliminating the need for mechanical blades that extend into the inner shell. This eliminates concerns about sulfur adhesion and blade wear caused by direct contact between the blades and the sulfur foam, significantly reducing the frequency of equipment cleaning and maintenance and replacement costs. The absence of friction or detachment of mechanical parts prevents impurities such as metal fragments from mixing into the sulfur foam, ensuring the purity of the molten sulfur separated later and reducing impurity interference to the downstream acid production process. Several spray nozzles on the stirring pipe can spray water in the flow equalization chamber radially along the inner shell, ensuring comprehensive stirring coverage and uniform disturbance, solving the problem of dead zones in traditional stirring machinery. The water vapor evaporating upwards in the liquid sulfur can carry the tar in the liquid sulfur upwards, improving the separation efficiency of liquid sulfur and tar.

[0012] Preferably, the connecting pipe is provided with multiple filter screens; the multiple filter screens are arranged sequentially along the direction of water vapor flow.

[0013] By adopting the above technical solution, water vapor can carry some light tar into the connecting pipe; by setting multiple filter screens to filter the tar, the tar separation efficiency is improved on the one hand, and the tar is prevented from re-entering the liquid sulfur from the flow equalization box on the other hand.

[0014] Preferably, a separation plate is vertically slidably disposed inside the inner shell; the separation plate is used to float on liquid sulfur; the separation plate has multiple through holes; a sealing plate is disposed at the bottom of the separation plate; the sealing plate is attached to the inner wall of the inner shell and is located at the overflow port.

[0015] By adopting the above technical solution, after the sulfur foam inside the hot-melt shell settles, the liquid sulfur and tar gradually separate into layers; after complete separation, the separation plate floats at the interface between the liquid sulfur and tar; at this time, the tar and liquid sulfur separate into layers within the through holes, improving the separation accuracy of tar and liquid sulfur; when the sealing door is opened, the tar is discharged from the overflow port; the sealing plate can seal the overflow port located at the bottom of the separation plate, preventing liquid sulfur from being discharged from the overflow port; this solves the problem of poor accuracy and high safety hazards in traditional methods of judging the location of tar discharge by human eyes; and in the traditional process of discharging tar, some... Liquid sulfur is discharged along with tar, resulting in resource waste. The separation plate can confine the liquid sulfur within the through hole. When tar is discharged, the tar above the separation plate and part of the tar in the through hole are discharged, greatly reducing sulfur waste. When the first valve is opened to discharge liquid sulfur, the separation plate also descends as the liquid sulfur level drops, separating the tar from the liquid sulfur in the through hole. This prevents tar from penetrating into the liquid sulfur below the separation plate, resulting in higher purity of the discharged liquid sulfur. When the separation plate is attached to the bottom wall of the inner shell, only a small amount of liquid sulfur remains in the through hole.

[0016] Preferably, the top surface of the separation plate and the top surface of the flow equalization box are both upwardly convex first spherical surfaces; the bottom surface of the separation plate is an upwardly concave second spherical surface.

[0017] By adopting the above technical solution, the flow-guiding spherical surface can guide the liquid sulfur above the separation plate into the through hole, avoiding the accumulation of liquid sulfur above the separation plate and further improving the separation accuracy of liquid sulfur and tar.

[0018] Preferably, the stirring unit further includes a buffer water tank; the buffer water tank is disposed on the hot-melt shell; and the connecting pipe is connected to the buffer water tank.

[0019] Preferably, the flow equalization box is provided with a partition; the partition divides the interior of the flow equalization box into a flushing chamber and the flow equalization chamber; the partition has a sliding hole; a flushing pipe is slidably arranged vertically in the sliding hole; the flushing pipe passes through the stirring pipe upward; a plurality of flushing holes are opened on the periphery of the top of the flushing pipe; the flushing holes are located above the separation plate; the connecting pipe communicates with the flushing chamber; a third valve is provided at the connection between the connecting pipe and the flushing chamber.

[0020] By adopting the above technical solution, the tar separation efficiency is improved by using the water in the sulfur foam to flush the tar above the separation plate to the overflow port; at the same time, when flushing the tar above the separation plate, some of the tar in the through hole can also be carried away, further improving the tar separation effect.

[0021] This application also provides a pretreatment method for sulfur foam acid production, which adopts the following technical solution: Includes the following steps: Step S1: Add emulsifier to the sulfur foam in the demulsification mixing tank; drive the demulsification mixing tank to stir the sulfur foam; Step S2: The emulsified sulfur foam in the demulsification stirring tank is transferred to the hot melt separation device; the second valve is opened, the sealing door, the first valve and the third valve are closed, and the heating unit is driven to heat the hot melt shell and the pressure pump is driven to work; Step S3: After opening the second valve for 10 to 20 minutes, close the second valve and let the liquid sulfur in the hot melt separation device stand for 0.5 to 1 hour; Step S4: Open the sealing door and the third valve; let the water in the buffer tank flow into the inner shell, and discharge the tar from the overflow port; Step S5: After the tar has been completely discharged, open the first valve to discharge the liquid sulfur, and then pass it into the evaporation crystallization device, the drying device and the sulfur particle granulator in sequence.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The demulsification mixing tank first performs preliminary demulsification of the sulfur foam, causing the sulfur particles within the foam to agglomerate and initially separating the sulfur particles from the tar. The heating unit of the hot melt separation device melts the sulfur in the sulfur foam, forming liquid sulfur. The stirring unit ensures that the material in the hot melt shell is heated evenly, avoiding local agglomeration and allowing the sulfur to completely separate from the water and tar. After separation, the tar and water are discharged through the overflow port. The liquid sulfur at the bottom is discharged from the discharge port, reducing the impurity treatment load of subsequent evaporation and crystallization. The drying device and sulfur particle granulator convert the pretreated sulfur into standardized raw materials, improving resource utilization. By setting up the hot melt separation device, the need for gravity settling tanks, centrifuges, and filtration equipment can be eliminated, simplifying the sulfur foam pretreatment process.

[0023] 2. By pressurizing water vapor with a pressure pump inside the connecting pipe and discharging the pressurized water vapor into the liquid sulfur through a flow equalization box, the liquid sulfur is stirred. This ensures full utilization of the water within the sulfur foam, eliminating the need for mechanical blades extending into the inner shell. This avoids issues like sulfur adhesion and blade wear caused by direct contact between the blades and the sulfur foam, significantly reducing the frequency of equipment cleaning and maintenance costs. The absence of mechanical parts friction or detachment prevents impurities such as metal fragments from contaminating the sulfur foam, ensuring the purity of the subsequently separated molten sulfur and reducing interference with downstream acid production processes. Several nozzles on the stirring pipe spray water from the flow equalization chamber radially along the inner shell, ensuring comprehensive stirring coverage and uniform agitation, solving the problem of dead zones in traditional mechanical stirring. The upward evaporation of water vapor from the liquid sulfur carries the tar upwards, improving the separation efficiency of liquid sulfur and tar.

[0024] 3. After the sulfur foam inside the hot-melt shell settles, the liquid sulfur and tar gradually separate into layers. Once completely separated, the separation plate floats at the interface between the liquid sulfur and tar. At this point, the tar and liquid sulfur separate into layers within the through-hole, improving the accuracy of the tar and liquid sulfur separation. When the sealing door is opened, the tar is discharged from the overflow port. The sealing plate can seal the overflow port located at the bottom of the separation plate, preventing liquid sulfur from being discharged from the overflow port. This solves the problem of poor accuracy and high safety hazards in traditional methods of judging the location of tar discharge by eye. Furthermore, in the traditional process of discharging tar, some liquid sulfur is carried away with the tar. The liquid sulfur is discharged along with the tar, resulting in resource waste. The separation plate can confine the liquid sulfur within the through hole. When the tar is discharged, the tar above the separation plate and part of the tar in the through hole are discharged, greatly reducing the waste of sulfur. When the first valve is opened to discharge the liquid sulfur, the separation plate also drops as the liquid sulfur level drops, and the tar is separated by the liquid sulfur in the through hole. This prevents tar from penetrating into the liquid sulfur below the separation plate, making the discharged liquid sulfur more pure. When the separation plate is attached to the bottom wall of the inner shell, only a small amount of liquid sulfur is left in the through hole. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a sulfur foam acid pretreatment system.

[0026] Figure 2 This is a schematic diagram of the hot melt separation device in the embodiment.

[0027] Figure 3 This is a schematic diagram of the stirring unit in the embodiment.

[0028] Figure 4 yes Figure 2 A magnified view of part A in the image.

[0029] Figure 5 This is a schematic diagram of the internal structure of the hot melt separation device in the embodiment.

[0030] Figure 6 This is a schematic diagram of the separation plate in the embodiment.

[0031] Figure 7 yes Figure 2 A magnified view of part B in the image.

[0032] Explanation of reference numerals in the attached figures: 1. Demulsifying mixing tank; 2. Hot melt separation device; 3. Evaporation and crystallization apparatus; 4. Drying device; 5. Sulfur pellet granulator; 6. Hot-melt shell; 61. Inner shell; 62. Outer shell; 63. Hot-melt gap; 64. Overflow port; 65. Discharge port; 7. Heating unit; 71. Hot water tank; 72. Heating element; 8. Stirring unit; 81. Flow equalization box; 811. Flow equalization chamber; 812. Divider; 8121. Sliding hole; 813. Flushing chamber; 82. Stirring pipe; 821. Injection port; 83. Connecting pipe; 831. Filter screen; 84. Pressure pump; 85. Buffer water tank; 86. Flushing pipe; 861. Flushing hole; 862. Drive plate; 8621. Connecting hole; 863. Counterweight plate; 87. Blocking pipe; 871. Guide hole; 872. Guide chamber; 9. Separation plate; 91. Through hole; 92. Sealing plate; 93. First spherical surface; 94. Second spherical surface; 10. Hollow sliding column. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0034] This application discloses a sulfur foam acid production pretreatment system. (Refer to...) Figure 1-3 The system includes a demulsifying stirring tank 1, a hot-melt separation device 2, an evaporation crystallization device 3, a drying device 4, and a sulfur particle granulator 5 connected in sequence. The hot-melt separation device 2 includes a hot-melt shell 6, a heating unit 7, and a stirring unit 8. The hot-melt shell 6 includes an inner shell 61 and an outer shell 62. A hot-melt gap 63 exists between the inner shell 61 and the outer shell 62. The heating unit 7 is mounted on the hot-melt shell 6 and located within the hot-melt gap 63. A feed inlet is provided at the top of the hot-melt shell 6. The demulsifying stirring tank 1, hot-melt separation device 2, evaporation crystallization device 3, drying device 4, and sulfur particle granulator 5 are connected in sequence. The mixing tank 1 is connected to the feed inlet; an overflow port 64 and a discharge port 65 are sequentially provided on the side wall of the hot melt shell 6 from top to bottom; multiple overflow ports 64 and discharge ports 65 are provided and are evenly distributed along the circumference of the hot melt shell 6; a sealing door and a first valve are respectively provided at the overflow port 64 and the discharge port 65; the evaporation crystallization device 3 is connected to the discharge port 65; the stirring unit 8 is provided inside the hot melt shell 6; the stirring unit 8 is used to stir the sulfur foam inside the hot melt shell 6 to avoid local overheating of liquid sulfur.

[0035] During operation, an emulsifier is added to the demulsification stirring tank 1; the emulsifier is a polyether-based cationic surfactant; by driving the demulsification stirring tank 1 and using mechanical stirring, the emulsified structure of the sulfur particles is broken, causing the sulfur particles to agglomerate, and at the same time the sulfur foam concentration is adjusted to 50%-60%, which facilitates the subsequent hot melt separation device 2 to separate sulfur, tar and water.

[0036] The heating unit 7 can heat the sulfur foam in the hot melt shell 6 to 120℃-150℃; and form liquefied sulfur in the hot melt shell 6, while the tar becomes a black, low-viscosity liquid fluid with good fluidity; after the liquid sulfur, tar and water are separated into layers, from top to bottom they are water, tar and liquid sulfur; during separation, the sealing door is opened first, and the water and tar are discharged from the sealing door; then the first valve is opened, and the liquid sulfur is discharged from the first valve.

[0037] When the hot melt separation device 2 is working, it needs to be stirred for 10 to 20 minutes; then the stirring device is turned off and the liquid sulfur in the hot melt separation device 2 is allowed to stand for 0.5 to 1 hour; finally, the water, tar and liquid sulfur are discharged in batches.

[0038] Evaporation crystallization device 3 is used to recover ammonium sulfate from liquid sulfur; drying device 4 adopts a drum dryer or a vacuum dryer; after the moisture in the sulfur is removed by drying device 4, it is made into sulfur granules by sulfur granulator 5, which is convenient for storage and transportation.

[0039] Reference Figure 2 and Figure 4The stirring unit 8 includes a flow equalization tank 81, a stirring pipe 82, a connecting pipe 83, a buffer water tank 85, and a pressurizing pump 84. The flow equalization tank 81 is located at the bottom of the inner shell 61. The flow equalization tank 81 has a flow equalization cavity 811 inside. The stirring pipe 82 is vertically arranged on the flow equalization tank 81 and communicates with the flow equalization cavity 811. Several injection ports 821 are opened on the side wall of the stirring pipe 82. One end of the connecting pipe 83 is connected to the top of the inner shell 61, and the other end is connected to the flow equalization cavity 811. A second valve is provided at the connection between the flow equalization cavity 811 and the connecting pipe 83. The pressurizing pump 84 is located inside the connecting pipe 83. After the water in the flow equalization tank 81 is introduced into the liquid sulfur through the injection ports 821, it will stir the liquid sulfur. The water vapor generated by water evaporation carries the tar upward away from the liquid sulfur, improving the separation efficiency; a buffer tank 85 is installed on the hot-melt shell 6; one end of the connecting pipe 83 is connected to the top of the inner shell 61, and the other end is connected to the buffer tank 85 and the flow equalization chamber 811 in sequence; the buffer tank 85 can reduce the pressure of the connecting pipe 83 and cause the water vapor to condense into water in the buffer tank 85; multiple filter screens 831 are arranged in sequence in the connecting pipe 83 along the flow direction of the water vapor; the filter screens 831 can filter the light tar in the water vapor and prevent the tar from entering the liquid sulfur from the bottom of the hot-melt shell 6; a second valve is installed at the connection between the flow equalization chamber 811 and the connecting pipe 83; a pressure pump 84 is installed in the connecting pipe 83.

[0040] Reference Figure 2 , Figure 5 and Figure 6 A separation plate 9 is vertically slidably disposed inside the inner shell 61; the separation plate 9 is a modified polyphenylene sulfide plate; so that the separation plate 9 can float on liquid sulfur and not on tar; multiple through holes 91 are provided on the separation plate 9.

[0041] The top surface of the separation plate 9 and the top surface of the flow equalization box 81 are respectively an upwardly protruding first spherical surface 93; the bottom surface of the separation plate 9 is an upwardly concave second spherical surface 94; the first spherical surface 93 on the separation plate 9 can guide the liquid sulfur above the separation plate 9 to its periphery, and the guided liquid sulfur settles downward after passing through the through hole 91, avoiding the accumulation of liquid sulfur above the separation plate 9 and improving the separation accuracy of liquid sulfur and tar.

[0042] The second spherical surface 94 at the bottom of the separation plate 9 can cooperate with the first spherical surface 93 on the flow equalization box 81. When the separation plate 9 moves down to the bottom, the first spherical surface 93 on the flow equalization box 81 fits against the second spherical surface 94 at the bottom of the separation plate 9.

[0043] A sealing plate 92 is provided at the bottom of the separation plate 9; the sealing plate 92 is attached to the inner wall of the inner shell 61 and is located at the overflow port 64; when the sealing door is opened, tar is discharged from the overflow port 64; the sealing plate 92 can seal the overflow port 64 located at the bottom of the separation plate 9 to prevent liquid sulfur from being discharged from the overflow port 64.

[0044] Reference Figure 2 , Figure 4 and Figure 7 A partition 812 is provided inside the flow equalization box 81; the partition 812 divides the interior of the flow equalization box 81 into a flushing chamber 813 and a flow equalization chamber 811; a connecting pipe 83 is also connected to the flushing chamber 813; a third valve is provided at the connection between the connecting pipe 83 and the flushing chamber 813; a sliding hole 8121 is provided vertically on the partition 812; a flushing pipe 86 is slidably arranged vertically inside the sliding hole 8121; the flushing pipe 86 is connected to the flushing chamber 813; the flushing pipe 86 passes through the stirring pipe 82 upwards; multiple flushing holes 861 are provided on the periphery of the top of the flushing pipe 86; the multiple flushing holes 861 are evenly distributed along the periphery of the flushing pipe 86; when the liquid sulfur, tar and water are completely separated, the flushing holes 861 are located above the separation plate 9.

[0045] A sealing tube 87 is sleeved on the outside of the flushing tube 86; the outer wall of the sealing tube 87 is in contact with the inner wall of the stirring tube 82; there is a flow guiding cavity 872 between the inner wall of the sealing tube 87 and the outer wall of the flushing tube 86; the flow guiding cavity 872 is connected to the flow equalization cavity 811; the sealing tube 87 and the flushing tube 86 are connected by a connector; a number of flow guiding holes 871 are opened on the sealing tube 87; a driving plate 862 is provided at the bottom of the flushing tube 86; a number of connecting holes 8621 are opened on the driving plate 862.

[0046] When the second valve is opened, several guide holes 871 are respectively aligned with several spray nozzles 821; water in the flow equalization chamber 811 flows into the guide chamber 872 and then passes through the guide holes 871 and spray nozzles 821 in sequence into the inner shell 61.

[0047] A counterweight plate 863 is also provided at the top of the flushing pipe 86; when the third valve is closed, the counterweight plate 863 can press the flushing pipe 86 downward into the stirring pipe 82; at this time, the bottom wall of the counterweight plate 863 is in contact with the top wall of the stirring pipe 82.

[0048] When the third valve is opened, the flushing chamber 813 is filled with pressurized water, which flows into the sliding hole 8121. Under the obstruction of the drive plate 862, the pressurized water pushes the drive plate 862 upward and drives the flushing pipe 86 and the sealing pipe 87 to move upward, causing the guide hole 871 to be misaligned with the spray port 821, thereby sealing the spray port 821. At the same time, the top of the flushing pipe 86 protrudes from the stirring pipe 82, exposing the flushing hole 861 inside the inner shell 61. While pushing the drive plate 862, the pressurized water enters the flushing pipe 86 through the connecting hole 8621 and flows from the flushing hole 861 to the top wall of the separation plate 9, which can flush the tar above the separation plate 9 to the overflow port 64. At the same time, when flushing the tar above the separation plate 9, it can also carry away some of the tar in the through hole 91, further improving the tar separation effect.

[0049] When the first valve is opened to discharge liquid sulfur, the separation plate 9 also descends as the liquid sulfur level drops, separating the tar from the liquid sulfur in the through hole 91; this prevents tar from penetrating into the liquid sulfur below the separation plate 9, thus increasing the purity of the discharged liquid sulfur; when the separation plate 9 is in contact with the bottom wall of the inner shell 61, the separation plate 9 cooperates with the bottom wall of the inner shell 61 to store a small amount of liquid sulfur and tar in the through hole 91.

[0050] Reference Figure 2 and Figure 5 Multiple hollow sliding columns 10 made of perfluoroether rubber are provided on the flow equalization box 81; the multiple hollow sliding columns 10 pass through multiple through holes 91 upwards respectively; the interior of the hollow sliding column 10 is connected to the flushing chamber 813.

[0051] When the third valve is opened, some of the water in the flushing chamber 813 can flow into the hollow slide column 10; and cause the hollow slide column 10 to expand outward, thereby reducing the amount of tar and liquid sulfur in the through hole 91; the hollow slide column 10 can also guide the separation plate 9, preventing the separation plate 9 from shifting when sliding up and down, thus improving the stability of the separation plate 9.

[0052] It should be noted that the sealing door is inserted into the overflow port 64 and fixed to the outer shell 62 by bolts; when the sealing door seals the overflow port 64, the end face of the sealing door inserted into the overflow port 64 abuts against the plate surface of the sealing plate 92; the first valve, the second valve and the third valve are pneumatic butterfly valves.

[0053] The working principle of the sulfur foam acid production pretreatment system and pretreatment method in this application is as follows: By using mechanical stirring in the demulsification mixing tank 1 in conjunction with the action of emulsifier, the concentration of sulfur foam is increased from the initial 5-15% to 50-60%, creating conditions for subsequent hot melt separation; the mechanical stirring speed is usually 200-500 rpm.

[0054] The heating unit 7 heats the hot melt gap 63 to 120-150℃, causing the sulfur to liquefy into liquid sulfur, reducing the tar viscosity to 0.1-0.5 Pas, while the water remains liquid.

[0055] In the initial state, the sealing door, the first valve, and the third valve are closed, and the second valve is open. The pressurizing pump 84 draws water vapor from the top of the hot-melt shell 6 into the connecting pipe 83, which then enters the liquid sulfur through the injection port 821. During the process of water being injected into the liquid sulfur, micro-turbulence is formed, which, together with the upward-flowing water vapor, can peel off the tar wrapped in the sulfur particles and carry it to the upper layer. The first spherical surface 93 of the separation plate 9 guides the liquid sulfur to the through hole 91, forming local convection and accelerating the interface separation of tar and sulfur.

[0056] The separation plate 9 floats at the interface between liquid sulfur and tar and descends synchronously with the liquid level. When the liquid sulfur is discharged, the separation plate 9 maintains physical isolation between the tar layer and the sulfur layer through the through hole 91 to avoid secondary mixing.

[0057] After the second valve is opened for 10 to 20 minutes, the second valve is closed, and the liquid sulfur in the hot melt separation device 2 is allowed to stand for 0.5 to 1 hour. The sealing door and the third valve are opened, and the water in the buffer tank 85 is introduced into the inner shell 61, and the tar is discharged from the overflow port 64. At this time, the water in the buffer tank 85 is injected into the hollow slide column 10, which expands radially and squeezes the tar and liquid sulfur remaining in the through hole 91, thereby reducing the amount of tar and liquid sulfur remaining in the through hole 91. The high-pressure water jet is sprayed out from the flushing hole 861, and under the guidance of the first spherical surface 93 on the separation plate 9, the tar is pushed directionally to the overflow port 64, while also carrying away some of the tar in the through hole 91.

[0058] After the tar has been completely discharged, the first valve is opened to discharge the liquid sulfur, which is then sequentially fed into the evaporation crystallization device 3, the drying device 4, and the sulfur particle granulator 5.

[0059] This application also discloses a method for pretreatment of sulfur foam for acid production, including the following steps: Step S1: Add emulsifier to the sulfur foam in the demulsification mixing tank 1; drive the demulsification mixing tank 1 to stir the sulfur foam.

[0060] Step S2: The emulsified sulfur foam in the demulsification mixing tank 1 is transferred to the hot melt separation device 2; the second valve is opened, the sealing door, the first valve and the third valve are closed, and the heating unit 7 is driven to heat the hot melt shell 6 and the pressure pump 84 is driven to work.

[0061] Step S3: After opening the second valve for 10 to 20 minutes, close the second valve and let the liquid sulfur in the hot melt separation device 2 stand for 0.5 to 1 hour.

[0062] Step S4: Open the sealing door and the third valve; let the water in the buffer tank 85 flow into the inner shell 61, and discharge the tar from the overflow port 64.

[0063] Step S5: After the tar has been completely discharged, open the first valve to discharge the liquid sulfur, and then pass it into the evaporation crystallization device 3, the drying device 4 and the sulfur particle granulator 5 in sequence.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sulfur foam acid production pretreatment system, characterized in that: The device includes a demulsifying stirring tank (1), a hot melt separation device (2), an evaporation crystallization device (3), a drying device (4), and a sulfur particle granulator (5) connected in sequence. The hot melt separation device (2) includes a hot melt shell (6), a heating unit (7), and a stirring unit (8). The hot melt shell (6) has a feed inlet at the top. The demulsifying stirring tank (1) is connected to the feed inlet. An overflow port (64) and a discharge port (65) are sequentially opened on the side wall of the hot melt shell (6) from top to bottom. A sealing door and a first valve are respectively provided at the overflow port (64) and the discharge port (65). The evaporation crystallization device (3) is connected to the discharge port (65). The heating unit (7) is coiled on the hot melt shell (6). The stirring unit (8) is located inside the hot melt shell (6). The stirring unit (8) is used to stir the sulfur foam inside the hot melt shell (6).

2. The sulfur foam acid production pretreatment system according to claim 1, characterized in that: The heat-fused shell (6) includes an inner shell (61) and an outer shell (62); there is a heat-fused gap (63) between the inner shell (61) and the outer shell (62); the heating unit (7) is coiled in the heat-fused gap (63).

3. The sulfur foam acid production pretreatment system according to claim 2, characterized in that: The heating unit (7) includes a heating water tank (71) and a heating pipe (72); the heating pipe (72) is coiled in the heat-fusion gap (63); both ends of the heating pipe (72) are connected to the heating water tank (71).

4. The sulfur foam acid production pretreatment system according to claim 2, characterized in that: The stirring unit (8) includes a flow equalization box (81), a stirring tube (82), a connecting pipe (83), and a pressurizing pump (84); the flow equalization box (81) is located at the bottom of the inner shell (61); the flow equalization box (81) has a flow equalization cavity (811); the stirring tube (82) is vertically arranged on the flow equalization box (81) and communicates with the flow equalization cavity (811); a plurality of injection ports (821) are opened on the side wall of the stirring tube (82); one end of the connecting pipe (83) communicates with the top of the inner shell (61), and the other end communicates with the flow equalization cavity (811); a second valve is provided at the connection between the flow equalization cavity (811) and the connecting pipe (83); the pressurizing pump (84) is located inside the connecting pipe (83).

5. The sulfur foam acid production pretreatment system according to claim 4, characterized in that: The connecting pipe (83) is provided with a plurality of filter screens (831); the plurality of filter screens (831) are arranged in sequence along the direction of water vapor flow.

6. The sulfur foam acid production pretreatment system according to claim 4, characterized in that: A separation plate (9) is vertically slidably disposed inside the inner shell (61); the separation plate (9) is used to float on liquid sulfur; multiple through holes (91) are provided on the separation plate (9); a sealing plate (92) is provided at the bottom of the separation plate (9); the sealing plate (92) is attached to the inner wall of the inner shell (61) and is located at the overflow port (64).

7. A sulfur foam acid production pretreatment system according to claim 6, characterized in that: The top surface of the separation plate (9) and the top surface of the flow equalization box (81) are respectively an upwardly convex first spherical surface (93); the bottom surface of the separation plate (9) is an upwardly concave second spherical surface (94).

8. A sulfur foam acid production pretreatment system according to claim 6, characterized in that: The stirring unit (8) also includes a buffer water tank (85); the buffer water tank (85) is disposed on the hot melt shell (6); the connecting pipe (83) is connected to the buffer water tank (85).

9. A sulfur foam acid production pretreatment system according to claim 8, characterized in that: The flow equalization box (81) is provided with a partition (812); the partition (812) divides the interior of the flow equalization box (81) into a flushing chamber (813) and the flow equalization chamber (811); a sliding hole (8121) is provided on the partition (812); a flushing pipe (86) is slidably arranged vertically in the sliding hole (8121); the flushing pipe (86) passes through the stirring pipe (82) upward; a plurality of flushing holes (861) are provided on the periphery of the top of the flushing pipe (86); the flushing holes (861) are located above the separation plate (9); the connecting pipe (83) is connected to the flushing chamber (813); a third valve is provided at the connection between the connecting pipe (83) and the flushing chamber (813).

10. A method for pretreatment of sulfur foam for acid production, applied to the sulfur foam acid production pretreatment system according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: Add emulsifier to the sulfur foam in the demulsification stirring tank (1); drive the demulsification stirring tank (1) to stir the sulfur foam; Step S2: The emulsified sulfur foam in the demulsification stirring tank (1) is transferred to the hot melt separation device (2); the second valve is opened, the sealing door, the first valve and the third valve are closed, and the heating unit (7) is driven to heat the hot melt shell (6) and the pressure pump (84) is driven to work; Step S3: After opening the second valve for 10 to 20 minutes, close the second valve and let the liquid sulfur in the hot melt separation device (2) stand for 0.5 to 1 hour; Step S4: Open the sealing door and the third valve; let the water in the buffer tank (85) flow into the inner shell (61) and discharge the tar from the overflow port (64); Step S5: After the tar has been completely discharged, open the first valve to discharge the liquid sulfur and pass it into the evaporation crystallization device (3), the drying device (4), and the sulfur particle granulator (5) in sequence.

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