Sulfur-containing sewage gasification device

Abstract

The utility model discloses a sulfur-containing sewage gasification device, which relates to the technical field of sewage treatment and comprises a stripping tower, a heat exchanger is arranged on the side surface of the stripping tower, one side of the bottom of the heat exchanger is connected with a steam distribution pipe, and the other side of the bottom of the heat exchanger is connected with an ultrasonic flowmeter through a sewage delivery pipe. Through the arrangement of the steam distribution pipe, the heat exchanger, the steam-water separator, the mixing pipe and the pipeline static mixer, part of steam which originally enters the stripping tower and is used for separating sulfide enters the heat exchanger through the steam distribution pipe, and then the steam exchanges heat with sulfur-containing sewage through the heat exchanger for preheating; the preheated steam enters a steam-water separator to separate condensate water, the separated dry steam and the sulfur-containing sewage are converged in a mixing pipe, and the sulfur-containing sewage and the steam are mixed through a pipeline static mixer; the inside of the pipeline can be cleaned to relieve blockage, the maintenance and replacement interval is prolonged, and the steam stripping separation efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sulfur-containing wastewater gasification device. Background Technology

[0002] Gasification of sulfur-containing wastewater is an important step in the treatment of sulfur-containing wastewater in the petrochemical and other fields. Its main purpose is to separate hydrogen sulfide and other sulfides from the wastewater through gasification. Subsequent treatment processes can then be used to manufacture sulfur or sulfuric acid from the separated sulfides, realizing the recovery and utilization of sulfur resources. After removing sulfides from sulfur-containing wastewater through the treatment process, the emission of sulfur-containing pollutants can be reduced, avoiding environmental pollution. It can also provide clean water for subsequent wastewater treatment, preventing sulfides from clogging pipes and corroding equipment.

[0003] Before entering the stripping tower, existing sulfur-containing wastewater undergoes processes such as oil removal and heating. While heating can accelerate the separation of sulfides in the stripping tower, it also causes the wastewater to react and produce precipitates. These precipitates are mainly formed by the reaction of sulfides with heavy metal ions, calcium and magnesium ions, bicarbonates, and other substances. These precipitates tend to adhere to the inner walls of pipes, which can easily cause blockages over time. Therefore, regular cleaning and replacement of the pipes are necessary, which is quite cumbersome. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a sulfur-containing wastewater gasification device to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sulfur-containing wastewater gasification device, comprising a stripping tower, a heat exchanger arranged on the side of the stripping tower, a steam distribution pipe connected to one side of the bottom of the heat exchanger, an ultrasonic flow meter connected to the other side of the bottom of the heat exchanger via a wastewater conveying pipe, a steam-water separator connected to one side of the top of the heat exchanger via a steam conveying pipe, and two flow regulating valves connected to the top of the steam-water separator via a steam diversion pipe, one of the flow regulating valves being connected to the ultrasonic flow meter via a mixing pipe, and a pipeline static mixer installed at the top of the mixing pipe.

[0006] By adopting the above technical solution, sulfur-containing wastewater enters through the inlet pipe, while steam enters through the steam distribution pipe. The steam distribution pipe diverts a portion of the steam originally intended for sulfide separation in the stripping tower to the heat exchanger, while the sulfur-containing wastewater enters directly into the heat exchanger. The heat exchanger then preheats the steam and sulfur-containing wastewater through indirect heat exchange. The heat exchanger can be horizontal, shell-and-tube, or tubular heat exchangers. The preheated sulfur-containing wastewater enters the mixing pipe through the wastewater delivery pipe, while the steam enters the steam-water separator through the steam delivery pipe to separate condensate. The separated dry steam enters the steam diversion pipe. An ultrasonic flow meter measures the flow rate of the sulfur-containing wastewater in the wastewater delivery pipe and outputs an analog signal to the external control room. The control room receives and processes the analog signal and then outputs control signals to two flow regulating valves to control their opening and closing. A portion of the steam then passes through one of the flow regulating valves. The valve and sulfur-containing wastewater converge in the mixing pipe, and then the static mixer in the pipeline mixes the sulfur-containing wastewater with steam. Another portion of the steam is recovered through another flow regulating valve and steam return pipe, and after condensation, it can be sent back to the evaporator to regenerate steam. During the mixing process of steam and sulfur-containing wastewater, the heat exchanger preheats the sulfur-containing wastewater to increase its temperature, and the steam-water separator separates the condensate from the steam, thus reducing the amount of condensate generated after the steam and sulfur-containing wastewater come into contact and mix, preventing excessive load on the static mixer and wastewater injection pipe. After mixing, the steam flows through the pipeline, flushing the inner walls of the static mixer and wastewater injection pipe, reducing sediment adhesion and extending the intervals for pipeline maintenance and replacement. Furthermore, the sulfur-containing wastewater is pulverized by the steam, allowing it to be further dispersed by the distributor in the stripping tower, increasing the contact area between the sulfur-containing wastewater and steam in the stripping tower, and improving the separation efficiency of sulfides.

[0007] Furthermore, a liquid inlet is connected to the upper side of one side of the stripping tower, an air inlet is connected to the lower side of one side of the stripping tower, an air outlet is connected to the upper side of the other side of the stripping tower, and a liquid outlet is connected to the lower side of the other side of the stripping tower.

[0008] By adopting the above technical solution, the sulfur-containing wastewater and steam mixed fluid enter the jet distributor above the stripping tower through the wastewater injection pipe and liquid inlet, and then are sprayed out from the distributor and flow from top to bottom in the stripping tower. Meanwhile, part of the steam separated from the steam distribution pipe enters the stripping tower through the air inlet and flows from bottom to top, so that the steam and sulfur-containing wastewater come into contact in the stripping tower, thereby separating the sulfides and discharging them from the air outlet. The wastewater with sulfides removed is discharged from the liquid outlet.

[0009] Furthermore, the steam distribution pipe is Y-shaped, and one side of the steam distribution pipe is connected to the air inlet at the bottom.

[0010] By adopting the above technical solution, part of the steam that originally entered the stripping column to separate sulfides is diverted through the steam distribution pipe into the heat exchanger, and the remaining part enters the interior of the stripping column through the air inlet and flows from bottom to top.

[0011] Further, a sewage injection pipe is connected to the top of the pipeline static mixer, and the sewage injection pipe is communicated with the liquid inlet.

[0012] By adopting the above technical solution, the sulfur-containing sewage and steam mixed fluid enters the ejector distributor above the interior of the stripping column through the sewage injection pipe and the liquid inlet.

[0013] Further, a liquid inlet pipe is connected to the other side of the top of the heat exchanger.

[0014] By adopting the above technical solution, the sulfur-containing sewage enters the heat exchanger from the liquid inlet pipe, and then the steam and the sulfur-containing sewage are indirectly heat-exchanged through the heat exchanger for preheating.

[0015] Further, a steam return pipe is connected to the bottom of the other flow regulating valve.

[0016] By adopting the above technical solution, another part of the steam is recovered through the other flow regulating valve and the steam return pipe, and after condensation, it can be sent back to the evaporator to regenerate steam.

[0017] Further, the cross-section of the mixing pipe is in a "卜" shape, and the mixing pipe is composed of a main pipe and a branch pipe. The included angle between the main pipe and the branch pipe is 45°, and the diameter of the outlet end of the branch pipe is larger than the diameter of the inlet end of the branch pipe.

[0018] By adopting the above technical solution, part of the steam passes through one of the flow regulating valves and converges with the sulfur-containing sewage in the mixing pipe, and then the sulfur-containing sewage and the steam are mixed by the pipeline static mixer. The shape of the branch pipe reduces the impact of the steam on the mixing pipe.

[0019] Further, the liquid inlet pipe, the sewage delivery pipe, the ultrasonic flowmeter, the mixing pipe, the pipeline static mixer and the sewage injection pipe are all made of 316L stainless steel material, and the probe of the ultrasonic flowmeter is made of high-temperature resistant piezoelectric ceramic material.

[0020] By adopting the above technical solution, the 316L stainless steel pipeline has excellent corrosion resistance, reduces the corrosion of the pipeline caused by sulfur-containing high-temperature sewage, and extends the service life of the pipeline.

[0021] Further, protective layers are provided inside the mixing pipe, the sewage injection pipe and the sewage delivery pipe, and the protective layers are glass flake coatings or ceramic coatings.

[0022] By adopting the above technical solution, using glass flake coating or ceramic coating as a protective layer, which is resistant to high temperature, corrosion and wear, sulfur-containing wastewater is isolated from 316L stainless steel pipes to avoid corrosion and improve the corrosion resistance of the pipes.

[0023] In summary, the present invention has the following main advantages:

[0024] 1. This utility model, through the arrangement of a steam distribution pipe, a heat exchanger, a steam-water separator, a mixing pipe, and a static mixer in the pipeline, diverts a portion of the steam that would otherwise enter the stripping tower for sulfide separation into the heat exchanger. The heat exchanger then preheats the steam by exchanging heat with the sulfur-containing wastewater. The preheated steam enters the steam-water separator to separate condensate. The separated dry steam and sulfur-containing wastewater converge in the mixing pipe, and the static mixer in the pipeline further mixes the wastewater and steam. By preheating the wastewater and separating the condensate from the steam, the temperature of the sulfur-containing wastewater is increased, thereby reducing the amount of steam mixed with sulfur-containing wastewater. The condensate produced after wastewater mixing prevents excessive load on the static mixer and wastewater injection pipe. The steam, after mixing with sulfur-containing wastewater, flows through the pipeline, flushing the inner walls of the static mixer and wastewater injection pipe, reducing sediment buildup and extending pipeline maintenance and replacement intervals. Furthermore, the steam pulverizes the sulfur-containing wastewater, allowing it to be further dispersed by the distributor in the stripping tower, increasing the contact area between the wastewater and steam and improving sulfide separation efficiency. This process also cleans the pipeline, reducing blockages and extending maintenance and replacement intervals, while also increasing stripping separation efficiency.

[0025] 2. This utility model uses a flow regulating valve and an ultrasonic flow meter to measure the flow rate of sulfur-containing wastewater. The ultrasonic flow meter then outputs an analog signal to an external control room. The control room receives and processes the analog signal, and then outputs a control signal to the flow regulating valve to adjust the flow rate of steam entering the mixing pipe. This ensures that when the flow rate of sulfur-containing wastewater increases, the steam input increases, and when the flow rate decreases, the steam input decreases, maintaining a steam-to-sulfur-containing wastewater ratio, such as 1:1 to 1:3, preventing uneven mixing due to excessive or insufficient steam, and increasing mixing stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 For the present utility model Figure 1 Enlarged view of the structure at point A in the image;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of the hybrid pipe of this utility model;

[0029] Figure 4This is a schematic diagram of the cross-sectional structure of the sewage injection pipe of this utility model.

[0030] In the diagram: 1. Stripping tower; 2. Air inlet; 3. Liquid inlet; 4. Air outlet; 5. Liquid outlet; 6. Steam distribution pipe; 7. Liquid inlet pipe; 8. Heat exchanger; 9. Steam delivery pipe; 10. Steam-water separator; 11. Steam diversion pipe; 12. Flow regulating valve; 13. Steam return pipe; 14. Sewage delivery pipe; 15. Ultrasonic flow meter; 16. Mixing pipe; 17. Pipeline static mixer; 18. Sewage injection pipe; 19. Protective layer. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The embodiments of this utility model will be described below based on its overall structure.

[0033] Example 1: A sulfur-containing wastewater gasification device, such as Figures 1-4As shown in the figure, it includes a stripping tower 1. A heat exchanger 8 is arranged on the side of the stripping tower 1. One side at the bottom of the heat exchanger 8 is connected with a steam distribution pipe 6. The steam distribution pipe 6 is in a "Y" shape. The other side at the bottom of the heat exchanger 8 is connected with an ultrasonic flowmeter 15 through a sewage conveying pipe 14. One side at the top of the heat exchanger 8 is connected with a steam-water separator 10 through a steam conveying pipe 9. The top of the steam-water separator 10 is connected with two flow regulating valves 12 through a steam shunt pipe 11. A mixing pipe 16 is connected between one of the flow regulating valves 12 and the ultrasonic flowmeter 15. The cross-section of the mixing pipe 16 is in a "卜" shape. The mixing pipe 16 is composed of a main pipe and a sub-pipe. The included angle between the main pipe and the sub-pipe is 45°. The diameter of the outlet end of the sub-pipe is larger than that of the inlet end of the sub-pipe. A pipe static mixer 17 is installed on the top of the mixing pipe 16. The top of the pipe static mixer 17 is connected with a sewage injection pipe 18. The bottom of the other flow regulating valve 12 is connected with a steam return pipe 13. The other side at the top of the heat exchanger 8 is connected with a liquid inlet pipe 7. The sulfur-containing sewage enters from the liquid inlet pipe 7, and the steam enters from the steam distribution pipe 6. Part of the steam originally entering the stripping tower 1 to separate sulfides is diverted through the steam distribution pipe 6 and enters the heat exchanger 8, while the sulfur-containing sewage directly enters the heat exchanger 8. Then, through the heat exchanger 8, the steam and the sulfur-containing sewage are indirectly heat-exchanged for preheating. The heat exchanger 8 can be a horizontal type or a tube-and-shell heat exchanger 8. The preheated sulfur-containing sewage enters the mixing pipe 16 through the sewage conveying pipe 14, while the steam enters the steam-water separator 10 through the steam conveying pipe 9 to separate condensed water. The separated dry steam enters the steam shunt pipe 11. The flow rate of the sulfur-containing sewage in the sewage conveying pipe 14 is measured by the ultrasonic flowmeter 15, and then an analog signal is output to the external control room. Then the control room receives and processes the analog signal, and then the control room outputs a control signal to the two flow regulating valves 12 to control the opening and closing size of the flow regulating valves 12. Then part of the steam passes through one of the flow regulating valves 12 and converges with the sulfur-containing sewage in the mixing pipe 16, and then the sulfur-containing sewage and the steam are mixed by the pipe static mixer 17. The other part of the steam is recovered through the other flow regulating valve 12 and the steam return pipe 13, and after condensation, it can be sent back to the evaporator to re-generate steam. During the process of mixing the steam and the sulfur-containing sewage, due to the preheating of the heat exchanger 8 to increase the temperature of the sulfur-containing sewage and the separation of condensed water in the steam by the steam-water separator 10, the condensed water generated after the steam and the sulfur-containing sewage come into contact and mix is reduced, avoiding excessive loads on the pipe static mixer 17 and the sewage injection pipe 18. After the steam and the sulfur-containing sewage are mixed, the steam can flow through the pipe to wash the inner walls of the pipe static mixer and the sewage injection pipe 18, reducing the phenomenon of sediment attachment and extending the interval between pipeline maintenance and replacement. Moreover, the sulfur-containing sewage is pulverized by the steam, enabling the sulfur-containing sewage to be more dispersed by the distributor in the subsequent stripping tower 1, increasing the contact area between the sulfur-containing sewage and the steam in the stripping tower 1, and improving the separation efficiency of sulfides.

[0034] Refer to Figure 1 In the above embodiment, a liquid inlet 3 is connected to the upper side of one side of the stripping tower 1, and a sewage injection pipe 18 is connected to the liquid inlet 3. An air inlet 2 is connected to the lower side of one side of the stripping tower 1, and a steam distribution pipe 6 is connected to the lower side of one side of the air inlet 2. An air outlet 4 is connected to the upper side of the other side of the stripping tower 1, and a liquid outlet 5 is connected to the lower side of the other side of the stripping tower 1. The sulfur-containing sewage and steam mixture enters the jet distributor at the upper part of the stripping tower 1 through the sewage injection pipe 18 and the liquid inlet 3, and then is sprayed out from the distributor and flows from top to bottom in the stripping tower 1. Meanwhile, part of the steam separated by the steam distribution pipe 6 enters the stripping tower 1 through the air inlet 2 and flows from bottom to top, so that the steam and the sulfur-containing sewage come into contact in the stripping tower 1, thereby separating the sulfides and discharging them from the air outlet 4.

[0035] Example 2: Based on Example 1 above, the following settings are made to increase corrosion resistance.

[0036] See Figures 1-4 In the above embodiments, the inlet pipe 7, sewage delivery pipe 14, ultrasonic flow meter 15, mixing pipe 16, pipeline static mixer 17, and sewage injection pipe 18 are all made of 316L stainless steel. The probe of the ultrasonic flow meter 15 is made of high-temperature resistant piezoelectric ceramic. The sewage delivery pipe 14, ultrasonic flow meter 15, mixing pipe 16, pipeline static mixer 17, and sewage injection pipe 18 are all equipped with a protective layer 19. The protective layer 19 is a glass flake coating or a ceramic coating. The thickness of the glass flake coating is ≥1.5mm, and the thickness of the ceramic coating is ≥0.8mm. The 316L stainless steel pipe has excellent corrosion resistance. The inner glass flake coating and ceramic coating are high temperature resistant, corrosion resistant, and wear resistant, which isolates the sulfur-containing sewage from the 316L stainless steel pipe to avoid corrosion and improves the corrosion resistance of the pipe in high temperature and high sulfur environment.

[0037] The implementation principle of this utility model is as follows: First, sulfur-containing wastewater enters through the inlet pipe 7, while steam enters through the steam distribution pipe 6. The steam that would normally enter the stripping tower 1 for sulfide separation is diverted through the steam distribution pipe 6 into the heat exchanger 8. The steam input of the corresponding steam distribution pipe 6 is greater than the existing steam input of the stripping tower 1 to compensate for the loss of air intake to the stripping tower 1 caused by the diversion through the steam distribution pipe 6, ensuring sufficient air intake for the stripping tower 1. The sulfur-containing wastewater directly enters the heat exchanger 8, where it undergoes indirect heat exchange with the steam for preheating. The heat exchanger 8 can be a horizontal type or a shell-and-tube type. The preheated sulfur-containing wastewater enters the mixing pipe 16 through the wastewater conveying pipe 14, while the steam enters the steam-water separator 10 through the steam conveying pipe 9 to separate condensate. The separated dry steam enters the steam diversion pipe 11. The flow rate of the sulfur-containing wastewater in the wastewater conveying pipe 14 is measured by the ultrasonic flow meter 15, and then reported to the external control room. The PLC control system outputs a 4-20mA analog signal. The PLC control system in the control room receives the analog signal, processes it using a PID algorithm, and then outputs a 4-20mA control signal to the two flow regulating valves 12. This controls the opening and closing of the flow regulating valves 12, allowing dynamic adjustment of the steam input ratio based on the sewage flow rate, such as a gas-liquid ratio of 1:3 or 1:1. Part of the steam then passes through one of the flow regulating valves 12 and merges with the sulfur-containing sewage in the mixing pipe 16. The sulfur-containing sewage and steam are then mixed by the pipeline static mixer 17. The pipeline static mixer 17 can be an SK or SV type static mixer. The pipeline static mixer 17 should have three or five stages, meaning at least three stages of mixing. If the number of stages exceeds five, over-mixing may cause mist entrainment in the stripping tower 1. The remaining steam is recovered through another flow regulating valve 12 and the steam return pipe 13, and after condensation, it can be sent back to the evaporator to regenerate steam.

[0038] During the mixing of steam and sulfur-containing wastewater, the heat exchanger 8 preheats the wastewater to increase its temperature, and the steam-water separator 10 separates the condensate from the steam, thereby reducing the amount of condensate generated after the steam and sulfur-containing wastewater come into contact and mix. This prevents the static mixer 17 and the wastewater injection pipe 18 from being overloaded. After the steam and sulfur-containing wastewater are mixed, the steam can flow through the pipeline to flush the inner walls of the static mixer and the wastewater injection pipe 18, reducing the adhesion of sediment and extending the interval between pipeline maintenance and replacement.

[0039] The sulfur-containing wastewater and steam mixture then enters the jet distributor above the stripping tower 1 through the wastewater injection pipe 18 and the liquid inlet 3. The jet distributor has an orifice density of 50 to 80 holes / m² and a jet angle of 30° to 45°. The mixture then flows from top to bottom within the stripping tower 1. Meanwhile, some of the steam separated from the steam distribution pipe 6 enters the stripping tower 1 through the air inlet 2 and flows from bottom to top. This allows the steam to contact the sulfur-containing wastewater within the stripping tower 1, thereby separating the sulfides and discharging them through the air outlet 4. The wastewater with sulfides removed is discharged through the liquid outlet 5. Furthermore, the sulfur-containing wastewater is pulverized by the steam, and combined with the distributor within the stripping tower 1, the sulfur-containing wastewater is further dispersed, increasing the contact area between the sulfur-containing wastewater and the steam within the stripping tower 1 and improving the sulfide separation efficiency. The pipes, heat exchangers 8, and other equipment are connected by flanges, and inspection ports can also be provided on the pipes, heat exchangers 8, and other equipment for convenient subsequent maintenance and replacement.

[0040] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A sulfur-containing wastewater gasification device, comprising a stripping tower (1), characterized in that: A heat exchanger (8) is provided on the side of the stripping tower (1), and a steam distribution pipe (6) is connected to one side of the bottom of the heat exchanger (8). The other side of the bottom of the heat exchanger (8) is connected to an ultrasonic flowmeter (15) through a sewage transfer pipe (14). One side of the top of the heat exchanger (8) is connected to a steam-water separator (10) through a steam transfer pipe (9), and two flow regulating valves (12) are connected to the top of the steam-water separator (10) through a steam shunt pipe (11). A mixing pipe (16) is connected between one of the flow regulating valves (12) and the ultrasonic flowmeter (15), and a pipe static mixer (17) is installed on the top of the mixing pipe (16).

2. The sulfur-containing wastewater gasification device according to claim 1, characterized by: A liquid inlet (3) is connected above one side of the stripping tower (1), an air inlet (2) is connected below one side of the stripping tower (1), an air outlet (4) is connected above the other side of the stripping tower (1), and a liquid outlet (5) is connected below the other side of the stripping tower (1).

3. The sulfur-containing wastewater gasification device according to claim 2, characterized by: The steam distribution pipe (6) is in a "Y" shape, and one side below the steam distribution pipe (6) is communicated with the air inlet (2).

4. The sulfur-containing wastewater gasification device of claim 2, wherein: A sewage injection pipe (18) is connected to the top of the pipe static mixer (17), and the sewage injection pipe (18) is communicated with the liquid inlet (3).

5. The sulfur-containing wastewater gasification device of claim 4, wherein: Another liquid inlet pipe (7) is connected to the other side of the top of the heat exchanger (8).

6. The sulfur-containing wastewater gasification device of claim 1, wherein: The bottom of the other flow regulating valve (12) is connected to a steam return pipe (13).

7. The sulfur-containing wastewater gasification device of claim 1, wherein: The cross-section of the mixing pipe (16) is in a "卜" shape, and the mixing pipe (16) is composed of a main pipe and a branch pipe. The included angle between the main pipe and the branch pipe is 45°, and the diameter of the outlet end of the branch pipe is larger than the diameter of the inlet end of the branch pipe.

8. The sulfur-containing wastewater gasification device of claim 5, wherein: The liquid inlet pipe (7), the sewage transfer pipe (14), the ultrasonic flowmeter (15), the mixing pipe (16), the pipe static mixer (17) and the sewage injection pipe (18) are all made of 316L stainless steel material, and the probe of the ultrasonic flowmeter (15) is made of high-temperature resistant piezoelectric ceramic material.

9. The sulfur-containing wastewater gasification device of claim 8, wherein: A protective layer (19) is provided inside the mixing pipe (16), the sewage injection pipe (18) and the sewage transfer pipe (14), and the protective layer (19) is a glass flake coating or a ceramic coating.

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