A regenerative waste fluid separation and closed discharge device

Abstract

The utility model relates to a kind of regenerated waste liquid separation and closed discharge device.The device includes: waste liquid cooler, gas-liquid separator, wherein, gas-liquid separator internal space is provided with first lower baffle and second lower baffle from bottom upwardly extending, and not reaching the top of gas-liquid separator along material flow direction, gas-liquid separator internal space is divided into front space, middle space and rear space, upper baffle is provided in the middle space of gas-liquid separator from top downwardly extending and not reaching the bottom of gas-liquid separator, the bottom of gas-liquid separator middle space is connected with waste liquid discharge pipeline, and the bottom of the rear space of gas-liquid separator is connected with waste water discharge pipeline.The utility model equipment quantity is less, and land occupation is small, and whole processing process is completely closed, realizes the closed automatic discharge of waste liquid, there is substantially no VOC emission in processing process, effectively realizes environmental protection, maximization of benefit.

Description

Technical Field

[0001] This utility model belongs to the field of industrial waste gas and wastewater purification, specifically relating to a device for separating and sealing off recycled waste liquid. Background Technology

[0002] Adsorbents are commonly used materials for separating target components from gases or liquids, and typically possess recyclable properties. Adsorbent regeneration refers to the process of removing or decomposing the adsorbate adsorbed on the adsorbent surface using physical or chemical methods without damaging the original structure of the adsorbent, thereby restoring its adsorption performance and allowing the adsorbent to be reused. Regeneration enables the recycling of adsorbents, reduces treatment costs, and minimizes waste generation. Currently, commonly used regeneration methods include thermal regeneration, chemical regeneration, biological regeneration, microwave radiation, and solvent regeneration. Among these, thermal regeneration is the most widely used and technologically mature method. It typically involves heating the adsorbent with a high-temperature medium, causing the adsorbed pollutants to detach from the adsorbent and thus restoring its adsorption function. Common methods include hot air regeneration, steam regeneration, and inert gas regeneration.

[0003] With the increasing use of adsorbent regeneration processes in industry, the proper treatment of the regenerated wastewater, a pollutant, has become a significant environmental issue. Appropriate equipment and methods should be selected based on the composition and properties of the wastewater to ensure its rational, safe, and efficient treatment and recycling, thereby achieving the goals of environmental protection, economic efficiency, and safeguarding human health.

[0004] Currently, the recycled wastewater is directly sent to sewage treatment plants. If the wastewater contains special media, it needs to be recycled by qualified manufacturers. Direct sewage treatment sometimes involves large volumes of wastewater with complex compositions, which conventional sewage treatment methods may not be able to handle entirely. The treated wastewater is discharged directly, usually in an open manner, which easily generates VOCs, resulting in a poor working environment. Furthermore, environmental protection measures need to be considered, increasing investment. Utility Model Content

[0005] This invention addresses the problems in the prior art described above. To this end, it provides a device for separating and sealing regenerated waste liquid. The regenerated waste liquid first undergoes gas-liquid separation in a gas-liquid separator. Some of the entrained gas in the waste liquid is separated into a gas phase, which is discharged through an air venting pipeline. Then, the liquid phase after gas-liquid separation undergoes oil-water separation in the same separator. The upper layer of wastewater after oil-water separation is transported to a wastewater treatment unit for treatment through a wastewater discharge pipeline, while the lower layer of waste liquid after oil-water separation is sent for external treatment through a waste liquid discharge pipeline. The entire external discharge process is automatically controlled by an automatic control system.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model provides a device for separating and sealing regenerated waste liquid, including: a waste liquid cooler and a gas-liquid separator. The gas-liquid separator has a first lower baffle and a second lower baffle extending upwards from the bottom along the material flow direction, but not reaching the top of the gas-liquid separator, dividing the internal space into a front space, a middle space, and a rear space. An upper baffle extending downwards from the top, but not reaching the bottom of the gas-liquid separator, is provided in the middle space of the gas-liquid separator.

[0008] A waste liquid discharge pipe is connected to the bottom of the middle space of the gas-liquid separator, and a wastewater discharge pipe is connected to the bottom of the rear space of the gas-liquid separator.

[0009] The tube-side inlet of the waste liquid cooler, i.e., the hot medium inlet, is connected to the waste liquid source pipeline. The shell-side inlet of the waste liquid cooler, i.e., the cold medium inlet, is connected to the circulating water supply pipeline. The shell-side outlet, i.e., the cold medium outlet, is connected to the circulating water return pipeline. The tube-side outlet of the waste liquid cooler, i.e., the hot medium outlet, is connected to the waste liquid inlet separator pipeline. The waste liquid inlet separator pipeline enters from the top of the front space of the gas-liquid separator and extends to the lower part or bottom of the front space of the gas-liquid separator. The top gas phase inlet of the gas-liquid separator is connected to the pressurizing gas pipeline. The top gas phase outlet of the gas-liquid separator is connected to the flare system through the venting gas pipeline. The bottom liquid phase outlet of the rear space of the gas-liquid separator is connected to the sewage treatment unit through the wastewater discharge pipeline. The bottom liquid phase outlet of the middle space of the gas-liquid separator is connected to the waste liquid discharge pipeline.

[0010] Further, the heights of the first lower baffle and the second lower baffle are 0.75±0.05D and 0.7±0.05D, respectively, and the height of the upper baffle is 0.5±0.05D. Preferably, the heights of the first lower baffle and the second lower baffle are 0.75±0.02D and 0.7±0.02D, respectively, and the height of the upper baffle is 0.5±0.02D. More preferably, the heights of the first lower baffle and the second lower baffle are 0.75D and 0.7D, respectively, and the height of the upper baffle is 0.5D, where D is the inner diameter or internal space height of the gas-liquid separator. The first lower baffle, the second lower baffle, and the upper baffle traverse the entire transverse space, that is, they are connected to the side walls on both transverse sides of the gas-liquid separator.

[0011] Furthermore, the positions of the first and second lower baffles are such that the front and rear spaces each account for 10-30% of the total interior space, preferably 15-25%, for example 20%, and the middle space accounts for 40-80% of the total interior space, preferably 50-70%, for example 60%. The upper baffle can be positioned between the first and second lower baffles, preferably closer to the second lower baffle, and can consist of one or more upper baffles, for example, two.

[0012] Furthermore, the waste liquid cooler adopts a shell-and-tube heat exchanger, with the shell side being a circulating water system and the waste liquid flowing through the tube side.

[0013] Furthermore, the gas-liquid separator is horizontal and cylindrical, comprising a cylindrical body and end caps located on both sides of the cylindrical body for sealing. A first support is installed at the bottom of the gas-liquid separator for support and fixation. An external heat tracing pipe (e.g., a steam heat tracing pipe) is installed outside the gas-liquid separator to maintain a certain temperature inside, for example, around 80°C. The gas-liquid separator has a material inlet (connected to the waste liquid inlet pipe), a steam inlet, a coke oven gas inlet, a vent, a first thermometer port located at the top of the middle space, a liquid outlet located at the bottom of the front space, an oil outlet located at the bottom of the middle space, a water outlet located in the rear space, a second thermometer port located at the bottom of the middle space, a safety valve port, an upper inlet of the liquid level gauge in the rear chamber of the separator, a lower inlet of the liquid level gauge in the rear chamber of the separator, an upper inlet of the liquid level gauge in the front chamber of the separator, a lower inlet of the liquid level gauge in the front chamber of the separator, an upper inlet of the interface gauge, a lower inlet of the interface gauge, a first external heat tracing pipe steam inlet, a first external heat tracing pipe steam outlet, a second external heat tracing pipe steam inlet, a second external heat tracing pipe steam outlet, a first manhole, and a second manhole.

[0014] Furthermore, the device also includes an automatic control system, which includes a control system, a separator mid-cavity interface gauge, a separator rear-cavity level gauge, a first valve, and a second valve. A separator rear-cavity level gauge is installed in the rear space of the gas-liquid separator, and a second valve is installed on the wastewater discharge pipeline. The separator rear-cavity level gauge is communicatively connected to the control system, and the control system is communicatively connected to the second valve. The separator rear-cavity level gauge on the gas-liquid separator transmits a level signal to the control system, which then controls the opening and closing of the second valve, i.e., controls the wastewater discharge. A separator mid-cavity interface gauge is installed in the middle space of the gas-liquid separator, and a first valve is installed on the wastewater discharge pipeline. The separator mid-cavity interface gauge is communicatively connected to the control system, and the control system is communicatively connected to the first valve. The separator mid-cavity interface gauge on the gas-liquid separator transmits a level signal to the control system, which then controls the opening and closing of the first valve, i.e., controls the wastewater discharge. The separator's intermediate cavity interface gauges may include a first and a second intermediate cavity interface gauge, respectively installed in the upper and side parts of the intermediate space of the gas-liquid separator. The separator's rear cavity level gauges may include a first and a second rear cavity level gauge, respectively installed at the top and bottom of the rear space of the gas-liquid separator. When the height of one interface gauge reaches a set value, the automatic valve (first valve) of the interlocked waste liquid pipeline opens for external discharge. The interface gauges are generally interlocked at 50-60% of their range. When the liquid level of the interface gauge reaches a set low value (for example, a liquid level of 200mm at the bottom of the tank is typically considered), the automatic valve (first valve) of the interlocked waste liquid pipeline closes to stop external discharge. When the height of one level gauge reaches a set value, the automatic valve (second valve) of the interlocked wastewater pipeline opens for external discharge. When the liquid level of the level gauge reaches a set low value, the automatic valve (second valve) of the interlocked wastewater pipeline closes to stop external discharge. Preferably, the level gauge in the rear chamber of the first separator is a radar level gauge, and the level gauge in the rear chamber of the second separator is a magnetic float level gauge. The level gauges in the rear chambers of the first and second separators can be installed on the top and side of the gas-liquid separator.

[0015] Furthermore, a liquid level gauge is installed in the front space of the gas-liquid separator to detect the amount of liquid entering the separator.

[0016] Furthermore, a density meter is also installed in the middle space of the gas-liquid separator. The density meter can be installed on the lower side of the tank to monitor the oil-water separation status.

[0017] Furthermore, the waste liquid cooler adopts a shell-and-tube heat exchanger; the gas-liquid separator adopts a horizontal gas-liquid separator; and the first valve and the second valve are pneumatically operated automatic control valves.

[0018] The process using the above-mentioned regenerated waste liquid separation and closed-loop discharge device includes the following steps: The regenerated waste liquid (i.e., the regenerated waste liquid from the deoiling and denaphthalene removal tower in coke oven gas utilization, with a temperature of approximately 250±5℃ before cooling) enters the waste liquid cooler through the regenerated waste liquid feed pipeline, where it exchanges heat with the circulating water (with a temperature of approximately 32±5℃ before heat exchange) entering the waste liquid cooler through the circulating water supply pipeline. The circulating water after heat exchange (with a temperature of approximately 40±5℃ after heat exchange) is discharged through the circulating water return pipeline, and the cooled regenerated waste liquid ( The cooled regenerated waste liquid (temperature approximately 80±5℃) enters a gas-liquid separator (temperature maintained at 70~80℃) for gas-liquid and oil-water separation (generally allowed to stand for 1~3 hours, preferably 2 hours). The separator has two baffles (a first lower baffle and a second lower baffle) at the bottom, dividing the container into front, middle, and rear spaces. An upper baffle is also installed in the middle section. The front space receives liquid and acts as a buffer, while the middle space allows for static separation (impurities settle at the bottom). The rear space stores the separated upper layer of clear water. A steam tracing pipe is installed on the outer wall of the separator, and a separator thermometer and pressure gauge are located on the top of the tank to control the separator's operating temperature and pressure. Waste liquid first enters the bottom of the front space of the separator through the inlet pipe. During this process, gas-liquid separation occurs. The process gas mixed in the liquid automatically rises to the upper space of the separator. The separated gas phase can be discharged through the vent pipe at the top of the container. The liquid phase overflows into the middle space through the first lower baffle as the liquid level rises. The middle space has the largest volume. The liquid undergoes static stratification separation in this space. The upper water overflows into the rear space through the second lower baffle. At the same time, an upper baffle is provided in the middle to avoid disturbance of the liquid and ensure that the upper water can flow smoothly. The mixture of oil, naphthalene and other substances settles at the bottom of the middle space. Thus, the rear of the separator is mainly composed of upper water, while the middle part is mainly composed of a mixture of oil, naphthalene and other substances with higher density. Two interface gauges (first separator cavity interface gauge and second separator cavity interface gauge) are installed in the middle of the separator tank. When the height of one interface gauge reaches the set value, the automatic valve (first valve) of the interlocked waste liquid pipeline opens to discharge the liquid. When the liquid level of the interface gauge reaches the set low value, the automatic valve (first valve) of the interlocked waste liquid pipeline closes to stop the discharge. Two level gauges (first separator rear cavity level gauge and second separator rear cavity level gauge) are installed at the rear of the separator tank. When the height of one level gauge reaches the set value, the automatic valve (second valve) of the interlocked wastewater pipeline opens to discharge the liquid. When the liquid level of the level gauge reaches the set low value, the automatic valve (second valve) of the interlocked wastewater pipeline closes to stop the discharge. A level gauge (separator front cavity level gauge) is installed in the front space of the separator to detect the amount of liquid entering the separator. A densitometer is also installed in the middle to measure the density properties of the stratified media. Sight glasses are installed on the drainage and discharge pipelines for easy observation of the discharge process.The liquid discharge is carried out by pneumatic conveying. The pressing gas can be nitrogen, compressed air, process gas, etc., and the conveying pressure is 0.2~0.6MPa.

[0019] The recycled waste liquid first enters the bottom of the front space of the gas-liquid separator. This front space serves as a buffer to receive the liquid. As the liquid level rises, it overflows through the first lower baffle into the middle space, which has the largest volume. The oil-water interface level rises, allowing the oil and water to separate. The upper layer of water overflows through the second lower baffle into the rear space. Oil, naphthalene, and other mixtures settle at the bottom of the middle space. An upper baffle is also installed in the middle space to prevent fluid disturbance and ensure proper oil-water stratification. The gas phase separated from the liquid is released through the vent. The material is discharged into the flare system via the feed line. The liquid phase separated by gas-liquid separation undergoes further oil-water separation. When the liquid level in the gas-liquid separator is 85-95% of its height, preferably about 90%, the pressurizing gas enters the gas-liquid separator through the pressurizing gas feed line and is sent out under pressure. The liquid phase after oil-water separation is pressurized by the pressurizing gas and discharged from the gas-liquid separator. The wastewater in the liquid phase after oil-water separation is sent to the sewage treatment plant through the wastewater discharge pipeline, and the waste liquid in the liquid phase after oil-water separation is transported out for treatment through the waste liquid discharge pipeline.

[0020] Furthermore, the regenerated waste liquid is the waste liquid generated by using steam to regenerate the adsorbent or packing material; preferably, the main components of the regenerated waste liquid include water, oil and naphthalene; for example, the regenerated waste liquid is the regenerated waste liquid from the oil and naphthalene removal tower in coke oven gas utilization or the regenerated waste liquid in the process of coal gas purification and gas pretreatment.

[0021] Furthermore, the pressing gas is selected from nitrogen or process gas, and the process gas is selected from coke oven gas or raw material gas; the conveying pressure of the pressing gas is 0.4~0.6MPa.

[0022] The technical solution of this utility model has the following beneficial effects:

[0023] This utility model discloses a waste liquid separation and closed-loop discharge device, which includes: a waste liquid cooler, a gas-liquid separator, an automatic wastewater discharge system, an automatic waste liquid discharge system, a venting system, a pressing system, a circulating water system, and an automatic control system. The device has a small number of components, a small footprint, and the entire treatment process is completely closed, achieving closed and automatic discharge of waste liquid. There is virtually no VOC emission during the treatment process, effectively maximizing environmental protection and efficiency. Existing technologies typically involve direct discharge, which easily generates VOCs, creates a poor working environment, and requires environmental protection measures, increasing investment. With this utility model, the entire system is closed, eliminating VOC emissions, providing a friendly operating environment, and eliminating the need for separate environmental protection measures, thus saving on investment. Venting into the flare is also for safety and environmental protection reasons, preventing combustible gases and VOCs from entering the atmosphere. Attached Figure Description

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of the regenerated waste liquid separation and closed discharge device of this utility model;

[0026] Figure 2a This is a schematic diagram of the gas-liquid separator in the regenerated waste liquid separation and closed discharge device of this utility model. Figure 2b for Figure 2a Middle BB cross-section diagram, Figure 2c for Figure 2a C-section view;

[0027] Figure 3 The flowchart shows the process of the regenerated waste liquid separation and closed discharge device of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Waste liquid source pipeline; 2. Waste liquid cooler; 3. Circulating water return pipeline; 4. Circulating water supply pipeline; 5. Waste liquid inlet to separator pipeline; 6. Gas-liquid separator; 7. Pressurizing gas pipeline; 8. Venting gas pipeline; 9. Wastewater discharge pipeline; 10. Waste liquid discharge pipeline; 11. Separator front chamber drain pipeline; 12. Separator first lower baffle; 13. Separator second lower baffle; 14. Separator upper baffle; 15. Separator front chamber level gauge; 16. First separator middle chamber interface gauge; 17. Separator thermometer; 18. First separator rear chamber level gauge; 19. Second separator rear chamber level gauge; 20. Separator density meter; 21. Second separator middle chamber interface gauge; 22. Separator heat tracing pipe; 23. Separator pressure gauge; 24. Sight glass; XV01-First valve; XV02-Second valve. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can be a connection within two components. The terms "upper," "middle," "outer," "inner," "lower," "around," "left," "right," "front," "rear," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In the following examples, the regenerated waste liquid is the regenerated waste liquid of the deoiling and denaphthalene removal tower in the coke oven gas utilization process, that is, the waste liquid generated at the bottom of the deoiling and denaphthalene removal tower during regeneration.

[0033] like Figure 1 and 2a As shown in Figures 2b and 2c, the regenerated waste liquid separation and closed discharge device of this utility model includes: a waste liquid cooler 2 and a gas-liquid separator 6, wherein...

[0034] The gas-liquid separator 6 has a first lower baffle 12 and a second lower baffle 13 extending upwards from the bottom along the material flow direction, but not reaching the top of the gas-liquid separator, dividing the internal space of the gas-liquid separator 6 into a front space, a middle space, and a rear space. An upper baffle 14 extending downwards from the top of the gas-liquid separator, but not reaching the bottom of the gas-liquid separator, is also provided in the middle space.

[0035] Waste liquid discharge pipe 10 is connected to the bottom of the middle space of the gas-liquid separator, and wastewater discharge pipe 9 is connected to the bottom of the rear space of the gas-liquid separator.

[0036] The tube-side inlet of the waste liquid cooler 2, i.e., the hot medium inlet, is connected to the waste liquid source pipeline 1. The shell-side inlet of the waste liquid cooler 2, i.e., the cold medium inlet, is connected to the circulating water supply pipeline 4. The shell-side outlet, i.e., the cold medium outlet, is connected to the circulating water return pipeline 3. The tube-side outlet of the waste liquid cooler 2, i.e., the hot medium outlet, is connected to the waste liquid inlet separator pipeline 5. The waste liquid inlet separator pipeline 5 enters from the top of the front space of the gas-liquid separator and extends to the lower part or bottom of the front space of the gas-liquid separator. The top gas phase inlet of the gas-liquid separator 6 is connected to the pressurizing gas pipeline 7. The top gas phase outlet of the gas-liquid separator 6 is connected to the flare system through the venting gas pipeline 8. The bottom liquid phase outlet of the rear space of the gas-liquid separator 6 is connected to the sewage treatment unit through the wastewater discharge pipeline 9. The bottom liquid phase outlet of the middle space of the gas-liquid separator 6 is connected to the waste liquid discharge pipeline 10.

[0037] The heights of the first lower baffle 12 and the second lower baffle 13 are 0.75±0.05D and 0.7±0.05D, respectively, and the height of the upper baffle 14 is 0.5±0.05D. Preferably, the heights of the first lower baffle 12 and the second lower baffle 13 are 0.75±0.02D and 0.7±0.02D, respectively, and the height of the upper baffle 14 is 0.5±0.02D. More preferably, the heights of the first lower baffle 12 and the second lower baffle 13 are 0.75D and 0.7D, respectively, and the height of the upper baffle 14 is 0.5D, where D is the inner diameter or internal space height of the gas-liquid separator. The first lower baffle 12, the second lower baffle 13, and the upper baffle 14 traverse the entire transverse space, i.e., they are connected to the side walls on both transverse sides of the gas-liquid separator.

[0038] Preferably, the positions of the first lower baffle 12 and the second lower baffle 13 are such that the front space and the rear space each account for 10-30% of the total internal space, preferably 15-25%, for example 20%, and the middle space accounts for 40-80% of the total internal space, preferably 50-70%, for example 60%. The upper baffle can be disposed between the first lower baffle and the second lower baffle, preferably the upper baffle is located on the side closer to the second lower baffle, and there can be one or more upper baffles, for example two.

[0039] Preferably, the waste liquid cooler adopts a shell-and-tube heat exchanger, with the shell side being a circulating water system and the waste liquid flowing through the tube side.

[0040] Preferably, the gas-liquid separator is horizontal and cylindrical, comprising a cylindrical body 603 and end caps 602 disposed on both sides of the cylindrical body for sealing. A first support 601 for support and fixation is installed at the bottom of the gas-liquid separator. An external heat tracing pipe 607 (e.g., a steam heat tracing pipe) is provided on the outside of the gas-liquid separator to maintain a certain temperature inside the gas-liquid separator, for example, around 80°C. Figure 2aAs shown, the gas-liquid separator has a material inlet N1 (connected to the waste liquid inlet separator pipe 5), a steam inlet N2 (the steam is used to maintain the tank temperature or purge the tank), a coke oven gas inlet N3 (connected to the pressurizing gas pipe 7), a vent N4 (connected to the venting gas pipe 8), a first thermometer port N5 located at the top of the middle space, a liquid outlet N6 located at the bottom of the front space (connected to the separator front chamber drain pipe 11), an oil outlet N7 located at the bottom of the middle space (connected to the waste liquid discharge pipe 10), and a water outlet located in the rear space. Port N8 (connected to wastewater discharge pipe 9), second thermometer port N9 located in the lower part of the middle space, safety valve port N10, upper port L1a of the separator rear chamber level gauge, lower port L1b of the separator rear chamber level gauge, upper port L2a of the separator front chamber level gauge, lower port L2b of the separator front chamber level gauge, upper port L3a of the interface gauge, lower port L3b of the interface gauge, steam inlet S1a of the first external heat tracing pipe, steam outlet S1b of the first external heat tracing pipe, steam inlet S2a of the second external heat tracing pipe, steam outlet S2b of the second external heat tracing pipe, first manhole M1, second manhole M2.

[0041] The end of the waste liquid inlet separator pipe 5 is preferably beveled, with an angle of approximately 45 ± 5 degrees to the horizontal. Figure 2a As shown.

[0042] In another preferred embodiment, the device further includes an automatic control system, which includes a control system, a separator middle cavity interface gauge, a separator rear cavity level gauge, a first valve XV01, and a second valve XV02. A separator rear cavity level gauge is installed in the rear space of the gas-liquid separator 6, and a second valve XV02 is installed on the wastewater discharge pipeline 9. The separator rear cavity level gauge is communicatively connected to the control system, and the control system is communicatively connected to the second valve XV02. The separator rear cavity level gauge on the gas-liquid separator 6 transmits the liquid level signal to the control system. The system controls the opening and closing of the second valve XV02, i.e., controls the wastewater discharge. A separator cavity interface gauge is installed in the middle space of the gas-liquid separator 6, and a first valve XV01 is installed on the wastewater discharge pipeline. The separator cavity interface gauge is communicatively connected to the control system, and the control system is communicatively connected to the first valve XV01. The separator cavity interface gauge on the gas-liquid separator 6 transmits the liquid level signal to the control system, and then the control system controls the opening and closing of the first valve XV01, i.e., controls the wastewater discharge. The separator cavity interface gauge may include a first separator cavity interface gauge 16 and a second separator cavity interface gauge 21, respectively installed in the upper and side parts of the middle space of the gas-liquid separator. The separator rear cavity liquid level gauge may include a first separator rear cavity liquid level gauge 18 and a second separator rear cavity liquid level gauge 19, respectively installed in the top and side parts of the rear space of the gas-liquid separator. When the level gauge reaches the set value, the automatic valve (first valve XV01) of the interlocked waste liquid pipeline opens for external discharge. The interlock is typically set at 50-60% of its range. When the level gauge reaches the set low value (e.g., a 200mm level at the bottom of the tank), the automatic valve (first valve XV01) of the interlocked waste liquid pipeline closes to stop the discharge. When the level gauge reaches the set value, the automatic valve (second valve XV02) of the interlocked wastewater pipeline opens for external discharge. When the level gauge reaches the set low value, the automatic valve (second valve XV02) of the interlocked wastewater pipeline closes to stop the discharge. Preferably, the level gauge in the rear chamber of the first separator is a radar level gauge, and the level gauge in the rear chamber of the second separator is a magnetic float level gauge.

[0043] In another preferred embodiment, the front space of the gas-liquid separator is provided with a separator front chamber level gauge 15 for detecting the amount of liquid entering the separator.

[0044] In another preferred embodiment, a densitometer is also provided in the middle space of the gas-liquid separator 6. The densitometer can be located on the lower side of the middle space of the tank to monitor the oil-water separation status.

[0045] In another preferred embodiment, the waste liquid cooler 2 is a shell-and-tube heat exchanger; the gas-liquid separator 6 is a horizontal gas-liquid separator; and the first valve XV01 and the second valve XV02 are pneumatic self-controlled valves.

[0046] like Figure 3As shown, the process using the above-mentioned regenerated waste liquid separation and closed discharge device includes the following steps: The regenerated waste liquid (i.e., the regenerated waste liquid from the deoiling and denaphthalene removal tower in coke oven gas utilization, with a temperature of approximately 250±5℃ before cooling) enters the waste liquid cooler 2 through the regenerated waste liquid feed pipeline, where it exchanges heat with the circulating water (with a temperature of approximately 32±5℃ before heat exchange) entering the waste liquid cooler 2 through the circulating water supply pipeline. The circulating water after heat exchange (with a temperature of approximately 40±5℃ after heat exchange) is discharged through the circulating water return pipeline. The cooled regenerated waste liquid... The liquid (the temperature of the cooled regenerated waste liquid is approximately 80±5℃) enters the gas-liquid separator 6 (temperature maintained at 70~80℃) for gas-liquid separation and oil-water separation (generally, it is allowed to stand for 1~3 hours, preferably 2 hours). The separator has two baffles (the first lower baffle and the second lower baffle) at the bottom, dividing the container into three spaces: front, middle, and rear. An upper baffle is also installed in the middle section. The front space is for receiving liquid and acting as a buffer, receiving the buffer solution. The middle space is for standing separation (impurities settle at the bottom), and the rear space stores the separated upper layer of clear water. A steam tracing pipe 22 is installed on the outer wall of the separator, and a separator thermometer 17 and a separator pressure gauge 23 are installed on the top of the tank to control the working temperature and pressure of the separator. Waste liquid first enters the bottom of the front space of the separator through the inlet pipe. During this process, gas-liquid separation occurs. The process gas mixed in the liquid automatically rises to the upper space of the separator. The separated gas phase can be discharged through the vent pipe at the top of the container. The liquid phase overflows into the middle space through the first lower baffle 12 as the liquid level rises. The middle space has the largest volume. The liquid is settled and separated into layers in this space. The upper water overflows into the rear space through the second lower baffle 13. At the same time, an upper baffle 14 is provided in the middle to avoid disturbance of the liquid and ensure that the upper water can flow smoothly. The mixture of oil, naphthalene and other substances settles at the bottom of the middle space. Thus, the rear of the separator is mainly the upper water, while the middle part is mainly the mixture of oil, naphthalene and other substances with higher density. Two interface gauges (interface gauge 16 in the first separator cavity and interface gauge 21 in the second separator cavity) are installed in the middle of the separator tank. When the height of one interface gauge reaches the set value, the automatic valve (XV01) of the interlocked waste liquid pipeline opens to discharge the liquid. When the liquid level of the interface gauge reaches the set low value, the automatic valve (XV01) of the interlocked waste liquid pipeline closes to stop the discharge. Two level gauges (level gauge 18 in the rear cavity of the first separator and level gauge 19 in the rear cavity of the second separator) are installed at the rear of the separator tank. When the height of one level gauge reaches the set value, the automatic valve (XV02) of the interlocked wastewater pipeline opens to discharge the liquid. When the liquid level of the level gauge reaches the set low value, the automatic valve (XV02) of the interlocked wastewater pipeline closes to stop the discharge. The front space of the separator is equipped with a level gauge (separator front chamber level gauge 15) to detect the amount of liquid entering, while the middle is equipped with a densitometer (separator densitometer 20) to measure the density properties of the stratified medium. The drainage and liquid discharge pipelines are equipped with sight glasses 24 to facilitate observation of the external discharge.The liquid discharge is carried out by pneumatic conveying. The pressing gas can be nitrogen, compressed air, process gas, etc., and the conveying pressure is 0.2~0.6MPa.

[0047] The recycled waste liquid first enters the bottom of the front space of the gas-liquid separator 6. This front space serves as a buffer to receive the liquid. As the liquid level rises, it overflows through the first lower baffle 12 into the middle space. The middle space has the largest volume, causing the oil-water interface level to rise and allowing for separation. The upper layer of water overflows through the second lower baffle 13 into the rear space. Oil, naphthalene, and other mixtures settle at the bottom of the middle space. An upper baffle 14 is also installed in the middle space to prevent fluid disturbance and ensure proper oil-water stratification. The gas phase separated from the liquid... The liquid phase separated by the gas-liquid separation is discharged into the flare system through the venting pipeline. The liquid phase is further separated into oil and water. When the liquid level in the gas-liquid separator 6 is 85-95% of its height, preferably about 90%, the pressurizing gas enters the gas-liquid separator 6 through the pressurizing gas inlet pipeline. The liquid phase after oil-water separation is pressurized by the pressurizing gas and discharged from the gas-liquid separator 6. The wastewater in the liquid phase after oil-water separation is sent to the sewage treatment through the wastewater discharge pipeline. The waste liquid in the liquid phase after oil-water separation is transported out for treatment through the waste liquid discharge pipeline.

[0048] In the above process, the entire treatment process is completely closed, realizing the closed and automatic discharge of waste liquid. There is basically no VOC emission during the treatment process, so there is no need to consider environmental protection measures separately, which can save this part of the investment.

[0049] In another preferred embodiment, the regenerated waste liquid is the waste liquid generated by using steam to regenerate the adsorbent or packing material; preferably, the main components of the regenerated waste liquid include water, oil and naphthalene; for example, the regenerated waste liquid is the regenerated waste liquid from the oil and naphthalene removal tower in coke oven gas utilization or the regenerated waste liquid in the process of coal gas purification and gas pretreatment.

[0050] In another preferred embodiment, the pressing gas is selected from nitrogen, process gas, and the process gas is selected from coke oven gas or raw material gas; the conveying pressure of the pressing gas is 0.4~0.6MPa. Example 1

[0051] A waste liquid separation and closed-loop discharge device includes: a waste liquid cooler 2 and a gas-liquid separator 6. The gas-liquid separator 6 has a first lower baffle 12 and a second lower baffle 13 extending upwards from the bottom along the material flow direction, but not reaching the top of the gas-liquid separator, dividing the internal space of the gas-liquid separator 6 into a front space, a middle space, and a rear space. An upper baffle 14 extending downwards from the top of the gas-liquid separator, but not reaching the bottom of the gas-liquid separator, is provided in the middle space.

[0052] Waste liquid discharge pipe 10 is connected to the bottom of the middle space of the gas-liquid separator, and wastewater discharge pipe 9 is connected to the bottom of the rear space of the gas-liquid separator.

[0053] The tube-side inlet of the waste liquid cooler 2, i.e., the hot medium inlet, is connected to the waste liquid source pipeline 1. The shell-side inlet of the waste liquid cooler 2, i.e., the cold medium inlet, is connected to the circulating water supply pipeline 4. The shell-side outlet, i.e., the cold medium outlet, is connected to the circulating water return pipeline 3. The tube-side outlet of the waste liquid cooler 2, i.e., the hot medium outlet, is connected to the waste liquid inlet separator pipeline 5. The waste liquid inlet separator pipeline 5 enters from the top of the front space of the gas-liquid separator and extends to the lower part or bottom of the front space of the gas-liquid separator. The top gas phase inlet of the gas-liquid separator 6 is connected to the pressurizing gas pipeline 7. The top gas phase outlet of the gas-liquid separator 6 is connected to the flare system through the venting gas pipeline 8. The bottom liquid phase outlet of the rear space of the gas-liquid separator 6 is connected to the sewage treatment unit through the wastewater discharge pipeline 9. The bottom liquid phase outlet of the middle space of the gas-liquid separator 6 is connected to the waste liquid discharge pipeline 10.

[0054] The heights of the first lower baffle 12 and the second lower baffle 13 are 0.75D and 0.7D, respectively, and the height of the upper baffle 14 is 0.5D, where D is the inner diameter of the gas-liquid separator. The first lower baffle 12, the second lower baffle 13, and the upper baffle 14 traverse the entire transverse space, that is, they are connected to the side walls on both sides of the transverse direction of the gas-liquid separator.

[0055] The positions of the first lower baffle 12 and the second lower baffle 13 result in the front space and the rear space each accounting for approximately 20% of the total interior space, while the middle space accounts for approximately 60% of the total interior space.

[0056] The waste liquid cooler uses a shell-and-tube heat exchanger, with the shell side being a circulating water system and the waste liquid flowing through the tube side.

[0057] The gas-liquid separator is horizontal and cylindrical, comprising a cylinder body 603 and end caps 602 located on both sides of the cylinder body for sealing. A first support 601 for support and fixation is installed at the bottom of the gas-liquid separator. An external heat tracing pipe 607 (steam heat tracing pipe) is installed on the outside of the gas-liquid separator to maintain a certain temperature inside, for example, around 80°C. Figure 2aAs shown, the gas-liquid separator has a material inlet N1 (connected to the waste liquid inlet separator pipe 5), a steam inlet N2 (the steam is used to maintain the tank temperature or purge the tank), a coke oven gas inlet N3 (connected to the pressing gas pipe 7), a vent N4, a thermometer port N5, a liquid outlet N6 located at the bottom of the front space (connected to the separator front chamber drain pipe 11), an oil outlet N7 located at the bottom of the middle space (connected to the waste liquid discharge pipe 10), and a water outlet N8 located in the rear space (connected to the wastewater discharge pipe 10). 9 connections), thermometer port N9, safety valve port N10, upper port L1a of the separator rear chamber level gauge, lower port L1b of the separator rear chamber level gauge, upper port L2a of the separator front chamber level gauge, lower port L2b of the separator front chamber level gauge, upper port L3a of the interface gauge, lower port L3b of the interface gauge, steam inlet S1a of the first external heat tracing pipe, steam outlet S1b of the first external heat tracing pipe, steam inlet S2a of the second external heat tracing pipe, steam outlet S2b of the second external heat tracing pipe, first manhole M1, and second manhole M2.

[0058] The device also includes an automatic control system, which comprises a control system, a separator middle cavity interface gauge, a separator rear cavity level gauge, a first valve XV01, and a second valve XV02. A separator rear cavity level gauge is installed in the rear space of the gas-liquid separator 6, and a second valve XV02 is installed on the wastewater discharge pipeline 9. The separator rear cavity level gauge is communicatively connected to the control system, and the control system is communicatively connected to the second valve XV02. The separator rear cavity level gauge on the gas-liquid separator 6 transmits the level signal to the control system, and then the control system controls the opening and closing of the second valve XV02, i.e., controls the wastewater discharge. A separator middle cavity interface gauge is installed in the middle space of the gas-liquid separator 6, and a first valve XV01 is installed on the wastewater discharge pipeline. The separator middle cavity interface gauge is communicatively connected to the control system, and the control system is communicatively connected to the first valve XV01. The separator middle cavity interface gauge on the gas-liquid separator 6 transmits the level signal to the control system, and then the control system controls the opening and closing of the first valve XV01, i.e., controls the wastewater discharge. The separator cavity interface gauge includes a first separator cavity interface gauge 16 and a second separator cavity interface gauge 21, which are respectively installed in the upper part and side part of the middle space of the gas-liquid separator. The separator rear cavity level gauge includes a first separator rear cavity level gauge 18 and a second separator rear cavity level gauge 19, which are respectively installed in the top and bottom of the rear space of the gas-liquid separator.

[0059] The front space of the gas-liquid separator is equipped with a separator front chamber level gauge 15, which is used to detect the amount of liquid entering the separator.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for separating and sealing off recycled waste liquid, characterized in that, The device includes: a waste liquid cooler (2) and a gas-liquid separator (6), wherein, The gas-liquid separator (6) has a first lower baffle (12) and a second lower baffle (13) extending upward from the bottom and not reaching the top of the gas-liquid separator along the material flow direction, dividing the internal space of the gas-liquid separator (6) into a front space, a middle space and a rear space. In the middle space of the gas-liquid separator, there is also an upper baffle (14) extending downward from the top and not reaching the bottom of the gas-liquid separator. Waste liquid discharge pipe (10) is connected to the bottom of the middle space of the gas-liquid separator, and wastewater discharge pipe (9) is connected to the bottom of the rear space of the gas-liquid separator. The tube-side inlet of the waste liquid cooler (2), i.e. the hot medium inlet, is connected to the waste liquid source pipeline (1). The shell-side inlet of the waste liquid cooler (2), i.e. the cold medium inlet, is connected to the circulating water supply pipeline (4). The shell-side outlet, i.e. the cold medium outlet, is connected to the circulating water return pipeline (3). The tube-side outlet of the waste liquid cooler (2), i.e. the hot medium outlet, is connected to the waste liquid inlet separator pipeline (5). The waste liquid inlet separator pipeline (5) enters from the top of the front space of the gas-liquid separator and extends to the lower part or bottom of the front space of the gas-liquid separator. The top gas phase inlet of the gas-liquid separator (6) is connected to the pressurizing gas pipeline (7). The top gas phase outlet of the gas-liquid separator (6) is connected to the flare system through the venting gas pipeline (8). The bottom liquid phase outlet of the rear space of the gas-liquid separator (6) is connected to the sewage treatment unit through the wastewater discharge pipeline (9). The bottom liquid phase outlet of the middle space of the gas-liquid separator (6) is connected to the waste liquid discharge pipeline (10).

2. The regenerated waste liquid separation and closed discharge device according to claim 1, characterized in that, The heights of the first lower baffle (12) and the second lower baffle (13) are 0.75±0.05D and 0.7±0.05D, respectively, and the height of the upper baffle (14) is 0.5±0.05D, where D is the inner diameter or internal space height of the gas-liquid separator.

3. The regenerated waste liquid separation and closed discharge device according to claim 2, characterized in that, The heights of the first lower baffle (12) and the second lower baffle (13) are 0.75±0.02D and 0.7±0.02D respectively, and the height of the upper baffle (14) is 0.5±0.02D.

4. The regenerated waste liquid separation and closed discharge device according to claim 3, characterized in that, The heights of the first lower baffle (12) and the second lower baffle (13) are 0.75D and 0.7D respectively, and the height of the upper baffle (14) is 0.5D.

5. The regenerated waste liquid separation and closed discharge device according to claim 1, characterized in that, The positions of the first lower baffle (12) and the second lower baffle (13) result in the front space and the rear space accounting for 10-30% of the total internal space, and the middle space accounting for 40-80% of the total internal space.

6. The regenerated waste liquid separation and closed discharge device according to claim 5, characterized in that, The positions of the first lower baffle (12) and the second lower baffle (13) result in the front space and the rear space accounting for 15-25% of the total internal space, and the middle space accounting for 50-70% of the total internal space.

7. The regenerated waste liquid separation and closed discharge device according to claim 6, characterized in that, The positions of the first lower baffle (12) and the second lower baffle (13) result in the front space and the rear space accounting for 20% of the total internal space, and the middle space accounting for 60% of the total internal space.

8. The waste liquid separation and closed discharge device according to claim 1, characterized in that, The waste liquid cooler uses a shell-and-tube heat exchanger, with the shell side being a circulating water system and the waste liquid flowing through the tube side.

9. The regenerated waste liquid separation and closed discharge device according to any one of claims 1-8, characterized in that, The gas-liquid separator (6) is horizontal and cylindrical, comprising a cylinder (603) and end caps (602) on both sides of the cylinder for sealing. A first support (601) for support and fixation is installed at the bottom of the gas-liquid separator. An external heat tracing pipe (607) is installed outside the gas-liquid separator to maintain a certain temperature inside. The gas-liquid separator has a material inlet (N1), a steam inlet (N2), a coke oven gas inlet (N3), a vent (N4), a first thermometer port (N5) located at the top of the middle space, a liquid outlet (N6) located at the bottom of the front space, and an oil outlet (N7) located at the bottom of the middle space. The following are listed: water outlet (N8) in the rear space, second thermometer port (N9) in the lower part of the middle space, safety valve port (N10), upper port (L1a) of the separator rear chamber level gauge, lower port (L1b) of the separator rear chamber level gauge, upper port (L2a) of the separator front chamber level gauge, lower port (L2b) of the separator front chamber level gauge, upper port (L3a) of the interface gauge, lower port (L3b) of the interface gauge, steam inlet (S1a) of the first external heat tracing pipe, steam outlet (S1b) of the first external heat tracing pipe, steam inlet (S2a) of the second external heat tracing pipe, steam outlet (S2b) of the second external heat tracing pipe, first manhole (M1), and second manhole (M2).

10. The regenerated waste liquid separation and closed discharge device according to any one of claims 1-8, characterized in that, The device also includes an automatic control system, which includes a control system, a separator middle cavity interface gauge, a separator rear cavity level gauge, a first valve (XV01), and a second valve (XV02). A separator rear cavity level gauge is installed in the rear space of the gas-liquid separator (6), and a second valve (XV02) is installed on the wastewater discharge pipe (9). The separator rear cavity level gauge is communicatively connected to the control system, and the control system is communicatively connected to the second valve (XV02). The separator rear cavity level gauge on the gas-liquid separator (6) transmits the level signal to the control system. The control system then controls the opening and closing of the second valve (XV02), that is, controls the wastewater to be sent out; the middle space of the gas-liquid separator (6) is provided with a separator cavity interface gauge, and the waste liquid discharge pipeline is provided with a first valve (XV01). The separator cavity interface gauge is connected to the control system, and the control system is connected to the first valve (XV01). The separator cavity interface gauge on the gas-liquid separator (6) transmits the liquid level signal to the control system, and then the control system controls the opening and closing of the first valve (XV01), that is, controls the waste liquid to be sent out.

11. The regenerated waste liquid separation and closed discharge device according to claim 10, characterized in that, The separator cavity interface gauge includes a first separator cavity interface gauge (16) and a second separator cavity interface gauge (21), which are respectively installed in the upper part and side part of the middle space of the gas-liquid separator. The separator rear cavity level gauge includes a first separator rear cavity level gauge (18) and a second separator rear cavity level gauge (19), which are respectively installed in the top and side of the rear space of the gas-liquid separator.

12. The regenerated waste liquid separation and closed discharge device according to any one of claims 1-8, characterized in that, The front space of the gas-liquid separator is equipped with a separator front chamber level gauge (15) to detect the amount of liquid entering the separator.

13. The regenerated waste liquid separation and closed discharge device according to claim 10, characterized in that, The waste liquid cooler (2) adopts a shell-and-tube heat exchanger; the gas-liquid separator (6) adopts a horizontal gas-liquid separator; the first valve (XV01) and the second valve (XV02) are pneumatic automatic control valves.

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