Automatic separation system for ammonium sulfate circulating mother liquor and acid tar

Abstract

The application discloses a kind of automatic separation system of ammonium sulphate circulating mother liquor and acid tar, it is related to ammonium sulphate circulating technical field, and its technical key points are: acid tar containing separator, it is connected with second, fourth overflow tank via overflow tank straight pipe, and there is separator control valve on fourth overflow tank pipeline;Third overflow tank is connected with mother liquor storage tank via second straight pipe, and overflow tank straight valve is arranged in pipe;Acid tar separator end is connected with mother liquor storage tank via mother liquor outlet pipe, and there is mother liquor outlet control valve on pipe;There are anti-mixing fixed plate and other components in separator, acid tar froth liquid level sleeve regulator is connected with tar overflow pipe;Acid tar overflow pipe is connected with acid tar secondary separation receiving tank, and there is large particle impurity filter screen in tank, bottom is connected with low-position mother liquor tank via valve and pipe, then is connected with mother liquor storage tank, also is connected with tar ammonia water clarification tank via valve, pipe and pump;The application can effectively realize the automatic separation of ammonium sulphate circulating mother liquor and acid tar, improve the quality of ammonium sulphate product, guarantee long-period stable operation of production, reduce production cost.

Description

Technical Field

[0001] This invention relates to the field of ammonium sulfate recycling technology, and in particular to an automatic separation system for ammonium sulfate recycling mother liquor and acid tar. Background Technology

[0002] In the coal chemical industry, the ammonia purification process of coke oven gas in coking plants, namely the ammonium sulfate section, is a crucial link. Its principle involves directly spraying a 2-20% sulfuric acid solution onto the coke oven gas, absorbing the ammonia and gradually increasing the ammonium sulfate content in the circulating mother liquor until it reaches saturation and precipitates as ammonium sulfate crystals. After centrifugal separation and hot air drying, a high-quality product meeting the quality requirements of GB / T535-2020 is produced. However, the gas produced during the dry distillation of coal in coking contains ammonia and various complex organic impurities. Although it undergoes purification through naphthalene removal, tar removal, and desulfurization systems before entering the ammonium sulfate section, small amounts of benzene hydrocarbons, naphthalene, phenols, pyridine, and other hydrocarbon compounds remain. Under acidic, heated conditions and in the presence of iron ions, these compounds undergo a series of complex chemical reactions, including sulfonation, dehydration, condensation, and polymerization, ultimately producing a large-molecule, structurally complex, dark-colored resinous or asphalt-like polymer—acid tar. Acid tar is not the desired product of ammonium sulfate production, but rather a troublesome byproduct or contaminant.

[0003] Acid tar poses numerous hazards, severely impacting both the environment and production equipment. From an environmental perspective, its strong acidity and high organic content cause serious water pollution, altering pH levels, depleting dissolved oxygen, and harming aquatic life. Indiscriminate dumping also damages soil structure and fertility. In production, the viscous nature of acid tar easily clogs pipes, pumps, heat exchangers, and centrifuges, leading to frequent shutdowns for cleaning and severely disrupting production continuity. It coats the surface of ammonium sulfate crystals, discoloring the product (turning it gray or black), lowering its grade and price. Furthermore, acid tar reduces the particle size of ammonium sulfate, making extraction from the circulating mother liquor difficult and potentially causing production system collapse. The free acid within it also exacerbates corrosion of production equipment. In addition, due to its complex composition and high toxicity, acid tar is classified as hazardous waste and cannot be disposed of arbitrarily. It must be professionally treated by qualified organizations, incurring high treatment costs and placing a significant burden on businesses.

[0004] Currently, the separation of ammonium sulfate mother liquor and acid tar is mainly based on the difference in their densities and their incompatibility. Acid tar is viscous and has a relatively high density (typically about 1.0 - 1.2 g / cm³). 3 It is a black liquid or semi-solid mixture, mainly composed of tar, coal powder, naphthalene, asphaltene, etc.; while ammonium sulfate mother liquor has a relatively low density (approximately 1.23 - 1.31 g / cm³). 3The solution is an aqueous solution (approximately 100 ml / ml), mainly composed of ammonium sulfate and a small amount of sulfuric acid. Due to their density difference, under static or low-speed flow conditions, acid tar naturally floats to the surface of the ammonium sulfate circulating mother liquor and accumulates on the upper layer. Simultaneously, acid tar is a hydrophobic organic mixture, while the ammonium sulfate mother liquor is a hydrophilic inorganic salt solution; the two are immiscible, forming a clear oil-water interface. This provides theoretical support for the separation of the ammonium sulfate circulating mother liquor and acid tar. Automatic separation technology of ammonium sulfate tar has always been a topic actively explored and tackled by coal chemical professionals. It not only relates to the quality of ammonium sulfate products, long-term stable operation of production, and production cost control, but also involves core aspects such as environmental compliance. Effective separation can achieve a shift from "passively handling faults" to "proactively optimizing production," bringing significant comprehensive benefits to enterprises. Therefore, developing an effective process device and process flow for the automatic separation of ammonium sulfate circulating mother liquor and acid tar has important practical significance. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems, the present invention aims to provide an automatic separation system for ammonium sulfate circulating mother liquor and acid tar, which can effectively realize the automatic separation of ammonium sulfate circulating mother liquor and acid tar, improve the quality of ammonium sulfate products, ensure long-term stable operation of production, and reduce production costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An automatic separation system for ammonium sulfate circulating mother liquor and acid tar includes: Acid-tar separator; The system comprises a first overflow tank, a second overflow tank, a third overflow tank, and a fourth overflow tank. The second and fourth overflow tanks are connected to an acid tar separator via overflow tank straight pipes. A separator control valve is installed on the pipe connecting the fourth overflow tank to the acid tar separator. The third overflow tank is connected to a mother liquor storage tank via a second straight pipe, which is equipped with an overflow tank straight valve. The end of the acid tar separator is connected to the mother liquor storage tank via a mother liquor outlet pipe, which is equipped with a mother liquor outlet control valve and a mother liquor venting and outlet control valve. The acid tar separator includes an anti-mixing fixing plate, an operating acid tar separation liquid level regulating plate, an acid tar foam liquid level sleeve regulator, a separator mother liquor liquid level fixing control plate, an acid tar separator tank liquid level regulator, and an acid tar foam anti-mixing plate. The acid tar foam liquid level sleeve regulator is connected to a tar overflow pipe. A secondary separation and receiving tank for acid tar is provided, with an acid tar overflow pipe connected to it. The secondary separation and receiving tank is equipped with a large-particle impurity filter. The bottom of the secondary separation and receiving tank is connected to a low-level mother liquor tank via a static separation mother liquor outlet valve and a separation mother liquor output pipe. The low-level mother liquor tank is connected to a mother liquor storage tank via a low-level tank mother liquor transfer pump and a low-level tank mother liquor transfer pipe. The secondary separation and receiving tank is also connected to a tar-ammonia water clarification tank via a static separation acid tar outlet valve, a separation acid tar output pipe, an acid tar transfer pump, and an acid tar transfer pipe. The acid tar separator is equipped with a vent pipe and a vent control valve at the bottom front end; the acid tar separator is equipped with a VOCs outlet pipe and a cleaning and inspection hole at the top.

[0007] Preferably, the heights of the components within the acid-tar separator are configured as follows: The lower part of the acid tar foam anti-mixing plate is parallel to the bottom plane of the acid tar separator at a height of 100~300mm; the starting acid tar separation liquid level regulating plate and the anti-mixing fixing plate are 320~500mm above the bottom plane of the acid tar separator; the height difference between the acid tar separator tank liquid level regulator and the acid tar foam liquid level sleeve regulator is -100~0mm, and can be dynamically adjusted according to the height of the acid tar foam layer.

[0008] Preferably, the acid tar secondary separation receiving tank has a two-stage separation structure; the first stage uses the large particle impurity filter screen to trap carbonized tar residue and polymers; the second stage uses static separation to separate the mother liquor and acid tar into layers, with the bottom mother liquor being transported to the low-level mother liquor tank through the static separation mother liquor outlet valve, and the top acid tar being transported to the cooling drum section through the static separation acid tar outlet valve.

[0009] Preferably, when the acid tar separator is under maintenance, the separator control valve is closed and the overflow tank straight-through valve is opened, so that the circulating mother liquor and the acid tar mixture can directly enter the mother liquor storage tank through the second straight-through pipe.

[0010] Preferably, the coordinated control of the acid tar foam level sleeve regulator and the acid tar separator tank level regulator creates a dual level difference between mother liquor overflow and acid tar overflow.

[0011] Preferably, the low-level tank mother liquor transfer pump regularly and quantitatively returns the secondary separated mother liquor to the mother liquor storage tank, forming a closed-loop cycle.

[0012] Preferably, the acid tar conveying pipeline is equipped with a heat tracing and insulation device.

[0013] The present invention has the following beneficial effects: I. Effective Automatic Separation of Ammonium Sulfate Circulating Mother Liquor and Acid Tar: This system, through the ingenious design of an acid tar separator and multiple overflow tanks, utilizes the different densities and immiscibility of acid tar and ammonium sulfate mother liquor to achieve automatic separation. The second and fourth overflow tanks are connected to the acid tar separator via overflow tank straight pipes. The separator control valve on the fourth overflow tank pipe controls the separation process. The third overflow tank is connected to the mother liquor storage tank via a second straight pipe, and the overflow tank straight valve on the second straight pipe can adjust the flow direction of the mother liquor. The reasonable arrangement of various components within the acid tar separator, such as the anti-mixing fixing plate and the acid tar foam anti-mixing plate, effectively prevents acid tar from mixing with the mother liquor. The acid tar foam level sleeve regulator is connected to the tar overflow pipe, which can lead out the separated acid tar, thereby achieving automatic separation of ammonium sulfate circulating mother liquor and acid tar.

[0014] II. Improving Ammonium Sulfate Product Quality: Acid tar coats the surface of ammonium sulfate crystals, causing discoloration, lowering product grade and price, and reducing particle size, making extraction from the circulating mother liquor difficult. This system effectively separates acid tar and ammonium sulfate mother liquor, avoiding the adverse effects of acid tar on ammonium sulfate crystals, thereby improving the quality of ammonium sulfate products and making them more compliant with the quality requirements of GB / T535-2020.

[0015] III. Ensuring Stable Long-Term Production Operation: The viscous nature of acid tar easily clogs pipes, pumps, heat exchangers, and centrifuges, leading to frequent shutdowns for cleaning and severely impacting production continuity. This system automatically separates acid tar and ammonium sulfate mother liquor, reducing acid tar residue and clogging in production equipment, lowering equipment failure rates, and ensuring stable long-term production operation. Furthermore, when the acid tar separator is under maintenance, the separator control valve is closed and the overflow tank straight-through valve is opened, allowing the circulating mother liquor and acid tar mixture to directly enter the mother liquor storage tank through the second straight-through pipe, without affecting the overall production process and further ensuring production stability.

[0016] IV. Reduced Production Costs: Free acid in acid tar exacerbates corrosion of production equipment, increasing maintenance and replacement costs; acid tar is classified as hazardous waste, resulting in high treatment costs. This system reduces acid tar corrosion of equipment, lowering maintenance costs. Simultaneously, automatic separation reduces acid tar production and processing volume, lowering treatment costs. Furthermore, the low-level tank mother liquor transfer pump periodically and quantitatively returns the secondary separation mother liquor to the mother liquor storage tank, forming a closed-loop cycle, improving mother liquor utilization and reducing production costs.

[0017] V. Two-stage separation structure of acid tar secondary separation receiving tank: The first stage uses a large particle impurity filter screen to intercept carbonized tar residue and polymers. The second stage uses static separation to separate the mother liquor and acid tar into layers, which further improves the separation effect of acid tar and mother liquor, making the mother liquor purer and the acid tar less impurity, which is convenient for subsequent processing and utilization.

[0018] VI. Synergistic control of the acid tar foam level sleeve regulator and the acid tar separator tank level regulator: forming a dual level difference between mother liquor overflow and acid tar overflow, which can more accurately control the levels of mother liquor and acid tar, ensuring the stability and accuracy of the separation process and improving separation efficiency.

[0019] 7. Heat Tracing and Insulation Devices for Acid Tar Conveying Pipelines: Because acid tar is viscous, it easily solidifies at low temperatures, affecting its transport. Heat tracing and insulation devices maintain the fluidity of the acid tar, ensuring its smooth transport to the cooling drum section and preventing pipeline blockages caused by acid tar solidification. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the component connection relationship in an embodiment of the present invention.

[0022] In the diagram: 1. Acid tar separator; 2. Overflow tank straight pipe; 3. Overflow tank straight pipe straight valve; 4. Separator control valve; 5. Second straight pipe; 7. Acid tar foam sleeve level regulator; 8. Cleaning and inspection hole; 9. Acid tar overflow pipe; 10. Anti-mixing fixing plate; 11. Acid tar foam anti-mixing plate; 12. Separator mother liquor level fixing control plate; 13. Acid tar separator tank level regulator; 14. VOCs outlet pipe; 15. Mother liquor outlet control valve; 16. Mother liquor venting and outlet control valve; 17. Mother liquor 18. Outflow pipe; 19. Mother liquor storage tank; 20. Large particle impurity filter screen; 21. Secondary acid tar separation receiving tank; 22. Static separation mother liquor outlet valve; 23. Separated mother liquor output pipe; 24. Low-level mother liquor tank; 25. Low-level tank mother liquor transfer pump; 26. Low-level tank mother liquor transfer pipeline; 27. Static separation acid tar outlet valve; 28. Separated acid tar output pipe; 29. ​​Acid tar transfer pump; 30. Acid tar transfer pipeline; 31. Vent pipe; 32. Vent control valve; 33. Start-up acid tar separation liquid level regulating plate. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, an automatic separation system for ammonium sulfate circulating mother liquor and acid tar includes: Acid tar separator 1; The system comprises a first overflow tank, a second overflow tank, a third overflow tank, and a fourth overflow tank. The second and fourth overflow tanks are connected to the acid tar separator 1 via overflow tank straight pipes 2. A separator control valve 4 is installed on the pipe connecting the fourth overflow tank to the acid tar separator 1. The third overflow tank is connected to a mother liquor storage tank 18 via a second straight pipe 5, which is equipped with an overflow tank straight valve. The end of the acid tar separator 1 is connected to the mother liquor storage tank 18 via a mother liquor outlet pipe 17, which is equipped with a mother liquor outlet control valve 15 and a mother liquor venting and outlet control valve 16. The acid tar separator 1 includes an anti-mixing fixing plate 10, an acid tar separation liquid level regulating plate 32, an acid tar foam liquid level sleeve regulator, a separator mother liquor liquid level fixing control plate 12, an acid tar separator 1 tank liquid level regulator, and an acid tar foam anti-mixing plate 11. The acid tar foam liquid level sleeve regulator is connected to a tar overflow pipe. A secondary acid tar separation receiving tank 20 is connected to an acid tar overflow pipe 9. The secondary acid tar separation receiving tank 20 is equipped with a large particle impurity filter screen 19. The bottom of the secondary acid tar separation receiving tank 20 is connected to a low-level mother liquor tank 23 via a static separation mother liquor outlet valve 21 and a separation mother liquor output pipe 22. The low-level mother liquor tank 23 is connected to a mother liquor storage tank 18 via a low-level tank mother liquor transfer pump 24 and a low-level tank mother liquor transfer pipe 25. The secondary acid tar separation receiving tank 20 is connected to a tar ammonia water clarification tank via a static separation acid tar outlet valve 26, a separation acid tar output pipe 27, an acid tar transfer pump 28, and an acid tar transfer pipe 29. A vent pipe 30 and a vent control valve 31 are installed at the bottom of the front end of the acid tar separator 1. A VOCs outlet pipe 14 and a cleaning and inspection hole 8 are installed at the top of the acid tar separator 1.

[0025] like Figure 1 As shown, the ammonium sulfate mother liquor and acid tar were separated based on density differences and incompatibility. Acid tar is viscous and has a relatively high density (approximately 1.0 - 1.2 g / cm³). 3 It is a black liquid or semi-solid mixture, mainly composed of tar, coal powder, naphthalene, asphaltene, etc.; ammonium sulfate mother liquor has a relatively low density (approximately 1.23 - 1.31 g / cm³). 3The solution contains approximately 100 ml of ammonium sulfate and a small amount of sulfuric acid. Under static or low-speed flow conditions, the acid tar will naturally float to the surface of the ammonium sulfate circulating mother liquor and accumulate on the upper layer of the mother liquor. At the same time, the two are immiscible, forming a clear oil-water interface. This system utilizes this characteristic to achieve separation.

[0026] The second and fourth overflow tanks are connected to the acid tar separator 1 via overflow tank straight pipe 2. A separator control valve 4 is installed on the pipe connecting the fourth overflow tank and the acid tar separator 1. During normal separation, the separator control valve 4 is opened, and the mixture containing acid tar and ammonium sulfate mother liquor enters the acid tar separator 1 from the fourth overflow tank for separation. The third overflow tank is connected to the mother liquor storage tank 18 via the second straight pipe 5, and an overflow tank straight valve is installed on the second straight pipe 5. When the acid tar separator 1 is under maintenance, the separator control valve 4 is closed and the overflow tank straight valve is opened, allowing the circulating mother liquor and the acid tar mixture to directly enter the mother liquor storage tank 18 through the second straight pipe 5 without affecting the overall production process. The end of the acid tar separator 1 is connected to the mother liquor storage tank 18 through the mother liquor outlet pipe 17. The mother liquor outlet pipe 17 is equipped with a mother liquor outlet control valve 15 and a mother liquor venting and outlet control valve 16. After normal separation, the mother liquor flows into the mother liquor storage tank 18 through the mother liquor outlet control valve 15. The venting and outlet control valve can be used for system venting and other operations.

[0027] The lower part of the acid tar foam anti-mixing plate 11 is parallel to the bottom plane of the acid tar separator 1 at a height of 100-300mm, which can prevent the acid tar foam from settling and mixing with the mother liquor. The anti-mixing fixing plate 10 is 320-500mm above the bottom plane of the acid tar separator 1, which further prevents the acid tar from mixing with the mother liquor and ensures the separation effect. The 320-500mm height from the bottom plane of the acid tar separator 1 allows for adjustment of the acid tar separation liquid level during the start-up phase to adapt to different production conditions. The height difference between the acid tar separator 1 tank level regulator and the acid tar foam level sleeve regulator is -100 to 0mm, and can be dynamically adjusted according to the height of the acid tar foam layer. The two systems work together to create a dual level difference between the overflow of mother liquor and the overflow of acid tar. The acid tar foam level regulator is connected to the tar overflow pipe. When the acid tar foam layer reaches a certain height, the acid tar flows out through the tar overflow pipe, achieving the separation of acid tar and mother liquor. The separator mother liquor level fixing control plate 12 can fix the mother liquor level to ensure the stability of the separation process.

[0028] Acid tar overflow pipe 9 is connected to acid tar secondary separation receiving tank 20. Acid tar flowing out of acid tar separator 1 enters acid tar secondary separation receiving tank 20. A large particle impurity filter screen 19 is installed inside the receiving tank. The first stage uses the large particle impurity filter screen 19 to trap carbonized tar residue and polymers. The second stage uses static separation to separate the mother liquor and acid tar into layers. The bottom mother liquor is transported to the low-level mother liquor tank 23 via static separation mother liquor outlet valve 21 and separation mother liquor output pipe 22. The top acid tar is transported to the tar ammonia water clarification tank via static separation acid tar outlet valve 26, separation acid tar output pipe 27, acid tar transfer pump 28, and acid tar transfer pipe 29. The low-level mother liquor tank 23 is connected to the mother liquor storage tank 18 via low-level tank mother liquor transfer pump 24 and low-level tank mother liquor transfer pipe 25. The low-level tank mother liquor transfer pump 24 periodically and quantitatively returns the secondary separated mother liquor to the mother liquor storage tank 18, forming a closed-loop cycle and improving the utilization rate of the mother liquor. The acid tar separator 1 is equipped with a vent pipe 30 and a vent control valve 31 at the bottom front end, which can be used for venting operations during system maintenance or cleaning; the acid tar separator 1 is equipped with a VOCs outlet pipe 14 at the top, which can lead out the volatile organic compounds generated during the separation process for treatment, reducing environmental pollution; the cleaning and inspection hole 8 facilitates the cleaning and inspection of the inside of the acid tar separator 1.

[0029] The lower part of the acid tar foam anti-mixing plate 11 is parallel to the bottom plane of the acid tar separator 1 at a height ranging from 100 to 300 mm. Because acid tar foam is relatively light and viscous, it easily settles and mixes with the mother liquor during the separation process. The presence of this anti-mixing plate effectively prevents the acid tar foam from settling, keeping it in the upper area of ​​the separator, thus avoiding mixing with the mother liquor, ensuring the purity of the mother liquor, and creating favorable conditions for subsequent separation processes.

[0030] The start-up acid tar separator level regulating plate 32 and the anti-mixing fixing plate 10 are positioned at a height of 320-500mm from the bottom plane of the acid tar separator 1. During the start-up phase, production conditions may be unstable, and parameters such as the flow rate and ratio of acid tar and mother liquor may change. The start-up acid tar separator level regulating plate 32 can adjust the acid tar separation level according to actual conditions, ensuring effective separation of acid tar and mother liquor under different operating conditions. The anti-mixing fixing plate 10 further prevents acid tar from mixing with the mother liquor. It works in conjunction with the acid tar foam anti-mixing plate 11 to isolate acid tar and mother liquor from different heights and angles, enhancing the separation effect.

[0031] The acid tar separator's tank 1 level regulator and acid tar foam level sleeve regulator have a height difference of -100 to 0 mm, and the tank 1 level regulator can be dynamically adjusted according to the height of the acid tar foam layer. During the separation process, the height of the acid tar foam layer will change with factors such as the flow rate of the mixed liquor entering the separator and the acid tar content. The acid tar foam level sleeve regulator is connected to a tar overflow pipe. When the acid tar foam layer rises to a certain height, the acid tar will flow out through the tar overflow pipe. Through dynamic adjustment, the tank 1 level regulator and the acid tar foam level sleeve regulator form a dual level difference of mother liquor overflow and acid tar overflow, precisely controlling the separation interface between acid tar and mother liquor, ensuring that acid tar can be separated from the mother liquor in a timely and effective manner, while avoiding excessive carryover of mother liquor.

[0032] The first stage of separation involves filtering out carbonized tar residue and polymers using a large-particle impurity filter 19. The acid tar flowing out of the acid tar separator 1 may contain some larger particulate impurities, such as carbonized tar residue and polymers. If these large particulate impurities are not removed, they will affect the subsequent processing and utilization of the acid tar, and may also cause blockages and wear on the conveying pipelines and equipment. The large-particle impurity filter 19 acts like a sieve, intercepting large particulate impurities in the acid tar, allowing the relatively pure acid tar to enter the second stage of separation.

[0033] The second-stage separation utilizes static separation to stratify the mother liquor and acid tar. After the first-stage separation, the acid tar enters the secondary acid tar receiving tank 20. Due to the density difference between the acid tar and the mother liquor, they will naturally separate into layers under static conditions. The denser acid tar will be on top, while the less dense mother liquor will be on the bottom. The mother liquor at the bottom can be transported to the low-level mother liquor tank 23 via the static separation mother liquor outlet valve 21, enabling its recycling. The acid tar at the top can be transported to the cooling drum section via the static separation acid tar outlet valve 26, allowing for further processing and utilization. This two-stage separation structure effectively improves the separation of acid tar and mother liquor, resulting in more efficient resource utilization.

[0034] like Figure 1As shown, during normal operation of the acid tar separator 1, the circulating mother liquor and the acid tar mixture are separated within the separator. When maintenance of the acid tar separator 1 is required, the separator control valve 4 is closed. This cuts off the flow of the mixture into the separator, preventing it from continuing to enter and affecting maintenance operations, and also avoiding any harm to maintenance personnel from residual substances within the separator. The overflow tank straight-through valve is opened, allowing the circulating mother liquor and acid tar mixture that were originally intended to enter the separator to directly enter the mother liquor storage tank 18 through the second straight-through pipe 5. This ensures the continuity of the production system, preventing the mixture from accumulating or interrupting the process due to separator maintenance, and allows maintenance personnel to perform maintenance work on the separator in a relatively safe environment free from material interference.

[0035] like Figure 1 As shown, the acid tar foam level sleeve regulator and the acid tar separator tank 1 level regulator work together to precisely control the separation interface between acid tar and mother liquor. The acid tar foam level sleeve regulator is connected to a tar overflow pipe, which monitors the height of the acid tar foam layer. When the acid tar foam layer rises to a certain height, the acid tar will flow out through the tar overflow pipe. The acid tar separator tank 1 level regulator can then dynamically adjust according to the height of the acid tar foam layer, forming a dual level difference between mother liquor overflow and acid tar overflow with the acid tar foam level sleeve regulator. Specifically, when the acid tar foam layer rises, the amount of acid tar overflowing from the acid tar foam level sleeve regulator increases. At the same time, the level regulator of tank 1 of the acid tar separator will be adjusted accordingly to make a suitable difference between the height of the mother liquor overflow port and the acid tar overflow height. This ensures that the acid tar can be separated from the mother liquor in a timely and effective manner, while the mother liquor flows out through the overflow port, achieving clear separation of acid tar and mother liquor and avoiding their mixing, which would affect product quality and production efficiency.

[0036] like Figure 1 As shown, the secondary separation mother liquor, after separation in the acid tar secondary separation receiving tank 20, enters the low-level tank. The low-level tank mother liquor transfer pump 24 periodically and quantitatively returns the secondary separation mother liquor from the low-level tank to the mother liquor storage tank 18. This periodic and quantitative return method forms a closed-loop circulation system. Timed return ensures that the mother liquor has a certain residence time in the system for sufficient processing and stabilization, avoiding accumulation or untimely processing of the mother liquor in the low-level tank. Quantitative return allows for precise control of the mother liquor flow rate, maintaining the stability of the mother liquor concentration and composition throughout the production system. Through this closed-loop circulation, the mother liquor can be recycled, reducing resource waste, and also helps ensure the stability of the production process and the uniformity of product quality.

[0037] like Figure 1As shown, acid tar has a high viscosity, which further increases at low temperatures, and may even solidify. This increases the flow resistance of acid tar in the pipeline, making transportation difficult and potentially causing blockages that disrupt normal production. Installing an insulation and heat tracing device can provide heat to the acid tar transportation pipeline 29, maintaining the temperature of the acid tar within a certain range, reducing its viscosity, and allowing it to flow smoothly. The insulation and heat tracing device can provide heat through steam, hot water, or electric heating. The appropriate heat tracing method should be selected based on different production environments and process requirements to ensure a stable and reliable acid tar transportation process.

[0038] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. An automatic separation system for ammonium sulfate circulating mother liquor and acid tar, characterized in that, include: Acid tar separator (1); The system comprises a first overflow tank, a second overflow tank, a third overflow tank, and a fourth overflow tank. The second and fourth overflow tanks are connected to an acid tar separator (1) via overflow tank straight pipes (2). A separator control valve (4) is installed on the pipe connecting the fourth overflow tank to the acid tar separator (1). The third overflow tank is connected to a mother liquor storage tank (18) via a second straight pipe (5). An overflow tank straight valve is installed on the second straight pipe (5). The end of the acid tar separator (1) is connected to a mother liquor outlet pipe (…). 17) Connected to the mother liquor storage tank (18), the mother liquor outlet pipe (17) is equipped with a mother liquor outlet control valve (15) and a mother liquor venting and outlet control valve (16); the acid tar separator (1) includes an anti-mixing fixing plate (10), an acid tar separation liquid level regulating plate (32), an acid tar foam liquid level sleeve regulator, a separator mother liquor liquid level fixing control plate (12), an acid tar separator (1) tank liquid level regulator, and an acid tar foam anti-mixing plate (11); the acid tar foam liquid level sleeve regulator is connected to a tar overflow pipe; A secondary separation receiving tank (20) for acid tar, the acid tar overflow pipe (9) is connected to the secondary separation receiving tank (20), the secondary separation receiving tank (20) for acid tar is equipped with a large particle impurity filter screen (19), the bottom of the secondary separation receiving tank (20) for acid tar is connected to a low-level mother liquor tank (23) through a static separation mother liquor outlet valve (21) and a separation mother liquor output pipe (22), the low-level mother liquor tank (23) is connected to a mother liquor storage tank (18) through a low-level tank mother liquor transfer pump (24) and a low-level tank mother liquor transfer pipe (25); the secondary separation receiving tank for acid tar is connected to a tar ammonia water clarification tank through a static separation acid tar outlet valve (26), a separation acid tar output pipe (27), an acid tar transfer pump (28), and an acid tar transfer pipe (29); The acid tar separator (1) is provided with a vent pipe (30) and a vent control valve (31) at the bottom front end; the acid tar separator (1) is provided with a VOCs outlet pipe (14) and a cleaning and inspection hole (8) at the top.

2. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, The height configuration of each component inside the acid tar separator (1) is as follows: The lower part of the acid tar foam anti-mixing plate (11) is parallel to the bottom plane of the acid tar separator (1) at a height of 100~300mm; the starting acid tar separation liquid level regulating plate (32) and the anti-mixing fixing plate (10) are 320~500mm above the bottom plane of the acid tar separator (1); the height difference between the liquid level regulator of the acid tar separator (1) tank and the liquid level sleeve regulator of the acid tar foam is -100~0mm, and can be dynamically adjusted according to the height of the acid tar foam layer.

3. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, The acid tar secondary separation receiving tank (20) has a two-stage separation structure; the first stage uses the large particle impurity filter screen (19) to intercept carbonized tar residue and polymer; the second stage uses static separation to separate the mother liquor and acid tar into layers, the bottom mother liquor is transported to the low-level mother liquor tank (23) through the static separation mother liquor outlet valve (21), and the top acid tar is transported to the cold drum section through the static separation acid tar outlet valve (26).

4. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, When the acid tar separator (1) is under maintenance, the separator control valve (4) is closed and the overflow tank straight valve is opened, so that the circulating mother liquor and acid tar mixture can directly enter the mother liquor storage tank (18) through the second straight pipe (5).

5. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, The coordinated control of the acid tar foam level sleeve regulator and the acid tar separator (1) tank level regulator forms a dual level difference between mother liquor overflow and acid tar overflow.

6. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, The low-level tank mother liquor transfer pump (24) will periodically and quantitatively return the secondary separated mother liquor to the mother liquor storage tank (18), forming a closed-loop cycle.

7. The automatic separation system for ammonium sulfate circulating mother liquor and acid tar according to claim 1, characterized in that, The acid tar conveying pipeline (29) is equipped with a heat tracing device.

Images