An acid water stripping plant with side-line fractional ammonia withdrawal

Abstract

The present application relates to the technical field of side-line grading ammonia extraction, and specifically discloses an acid water stripping treatment device for side-line grading ammonia extraction, which comprises: sequentially connected raw material pretreatment unit, single-tower pressurized stripping unit, side-line grading and fractional condensation unit, ammonia refining unit and purified water heat exchange and reuse unit; wherein the raw material pretreatment unit comprises: gas dissolving separation mechanism, raw material buffer system, conveying system, buffer system and pressurized filtration conveying system. The multi-stage buffer pressure stabilizing and homogenizing structure effectively offsets the fluctuation of the feeding condition, guarantees the stable feeding of the stripping system, through the processes of sectional stripping, grading ammonia extraction and gradient temperature reduction and fractional condensation, the low-sulfur rich-ammonia gas is extracted and the impurities are removed step by step, the ammonia refining load is reduced, the quality of liquid ammonia is improved, at the same time, the low-disturbance feeding is realized, the secondary emulsification of oil and water is inhibited, the time-controllable closed exhaust is matched, the sufficient degassing is guaranteed without disturbing the liquid phase condition, and the running stability and the resource processing performance of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of side-stream graded ammonia extraction technology, specifically to an acidic water stripping treatment device for side-stream graded ammonia extraction. Background Technology

[0002] The side-stream graded ammonia extraction acid water stripping process, also known as the single-tower pressurized side-stream extraction stripping process, is a mainstream and mature technology in the oil refining and petrochemical industries for treating acidic wastewater containing hydrogen sulfide, ammonia, and carbon dioxide. The raw acidic water is first pretreated by cyclone degreasing and degassing, then fed into a pressurized stripping tower via two separate hot and cold streams. High-temperature steam is introduced at the bottom of the tower to provide the heat source for stripping. Utilizing the differences in volatility and solubility between hydrogen sulfide, carbon dioxide, and ammonia in water, the cold feed at the top of the tower absorbs most of the ammonia in the gas phase, sending only high-purity hydrogen sulfide and carbon dioxide acidic gas to a sulfur recovery unit for sulfur production. By precisely controlling the temperature gradient within the tower, a highly enriched ammonia zone is formed in the middle of the tower, and a side-stream graded extraction of ammonia-rich gas is implemented. The extracted ammonia-rich gas then sequentially enters a three-stage variable temperature and pressure condensation system to complete graded purification, including high-temperature water separation and low-temperature sulfur fixation, removing most of the water and residual hydrogen sulfide. The crude ammonia gas is then obtained, and after low-temperature ammonia water washing, adsorption desulfurization refining, and compression condensation, industrial-grade liquid ammonia byproducts are produced. The dilute ammonia water generated by fractionation is returned to the raw material system for recycling. The purified water after removing hydrogen sulfide and ammonia at the bottom of the tower is cooled by heat exchange recovery of waste heat and can be reused in upstream production units or sent to the biochemical system for deep treatment. This process integrates the deacidification and deammoniation functions of the traditional double-tower stripping into a single tower. Compared with the double-tower process, it has the advantages of smaller equipment footprint, lower construction investment, lower steam energy consumption, and simpler operation process. It can be adapted to acidic water treatment conditions with different concentration ranges. It can realize the resource reuse of wastewater and simultaneously recover two valuable chemical products, hydrogen sulfide and ammonia. At the same time, it avoids problems such as pipeline ammonium salt blockage and corrosion caused by acid gas carrying ammonia and incomplete reaction of sulfur recovery unit. It has outstanding environmental and economic benefits. In the existing technical field, traditional single-tower stripping processes mostly adopt a fixed single-layer ammonia extraction mode, which cannot flexibly adjust the extraction position according to the feed water quality and fluctuations in ammonia sulfur composition. The extracted ammonia has large fluctuations in sulfur content and high impurity content, resulting in high loads and poor product purity in subsequent fractionation and refining. Furthermore, traditional fractionation processes have a single temperature drop gradient, which cannot achieve precise water and impurity removal at each stage. The condensate carries a lot of impurities, and the system accumulates serious pollution. In addition, acidic water stripping processes generally use a fixed-point direct-feed method in the raw material pretreatment stage, which has a large feed drop and violent water flow disturbance, making it easy to damage the raw materials already transported upstream. The emulsified oil and water undergoes secondary shearing and refining, further exacerbating the degree of emulsification in the water. This makes it difficult for the oil and water to separate naturally, and a large number of fine oil phase impurities enter the main stripping system with the water. This can easily cause a series of problems such as foaming in the tower, tower flushing, oil accumulation and scaling in heat exchange equipment, and ammonium salt crystallization blockage, which seriously affect the stability of the unit's operation. At the same time, traditional degassing and exhaust methods are mostly direct-flow constant exhaust structures, which cannot adaptively adjust the exhaust flow rate according to the dissolved gas desorption load in the tank. This can easily lead to insufficient degassing or excessive exhaust disturbance, causing the liquid surface to surge, which further deteriorates the oil-water separation conditions. Summary of the Invention

[0003] The purpose of this invention is to provide an acidic water stripping treatment apparatus for side-stream graded ammonia extraction, so as to at least solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an acidic water stripping treatment device for side-stream graded ammonia extraction, characterized in that it comprises: a raw material pretreatment unit, a single-tower pressurized stripping unit, a side-stream graded condensation unit, an ammonia refining unit, and a purified water heat exchange and reuse unit connected in sequence; the stripping main tower of the single-tower pressurized stripping unit is divided into an upper deacidification section, a middle graded ammonia extraction section, and a lower deep stripping section from top to bottom; the middle graded ammonia extraction section is vertically equipped with three to five layers of independently controllable side-stream extraction outlets, each extraction outlet is individually equipped with a control valve, a flow meter, and an anti-crystallization heat tracing component, and can independently switch to extract ammonia-rich gas according to the feed conditions; the side-stream graded condensation unit is equipped with a three-stage series stepped condensation structure to form a separation system of gradient cooling and step-by-step impurity removal; The raw material pretreatment unit includes: Dissolved gas separation mechanism; A raw material buffer system is located on the external rear side of the dissolved gas separation mechanism; A conveying system is located below the raw material buffer system, and the conveying system and the raw material buffer system are connected by pipelines; A buffer system is located on the lower left side of the dissolved gas separation mechanism, and the conveying system and the buffer system are connected by pipelines; A pressurized filtration and conveying system is located on the outer left side of the buffer system, and the pressurized filtration and conveying system and the buffer system are connected by pipelines.

[0005] Preferably, the dissolved gas separation mechanism includes: a base, a dissolved gas separation tank, a discharge pipe, a liquid level sensor, a connector pipe, a nitrogen sealing pipeline control valve, a gas sensor, a working platform, a liquid inlet component, and an exhaust unit; the base is fixedly installed on the ground in front of the exhaust unit; the dissolved gas separation tank is fixedly installed on the top inner side of the base in a vertical direction; one end of the discharge pipe is connected to the bottom discharge end of the dissolved gas separation tank, and the other end of the discharge pipe passes through the interior of the base and is connected to the raw material buffer system; the liquid level sensor is installed on the outer surface sidewall of the dissolved gas separation tank; the connector pipe is connected to the top center slot of the dissolved gas separation tank; the nitrogen sealing pipeline control valve is connected to the top left slot of the dissolved gas separation tank; the gas sensor is connected to the top right slot of the dissolved gas separation tank; the working platform is fixedly installed above the outer surface sidewall of the dissolved gas separation tank; the liquid inlet component is located above the inner cavity of the dissolved gas separation tank, and the exhaust unit is located above the outer surface of the dissolved gas separation tank.

[0006] Preferably, the liquid discharge component includes: an electric lift, a top frame, a first rotating seat, a first spur gear, a first motor, a first gear, a first universal joint, a flow control valve, and a telescopic pipe; the electric lift is two in number, and the two electric lifts are respectively fixedly installed on the left and right sides of the top of the inner wall of the base in the vertical direction; the top frame is fixedly installed on the bottom of the lifting ends of the two electric lifts in the horizontal direction; the first rotating seat is rotatably installed on the middle of the lower surface of the top frame through bearings; the first spur gear is fixedly installed on the top outer side of the first rotating seat in the circumferential direction; the first motor is fixedly installed on the left side of the lower surface of the electric lift; the first gear... A wheel is fixedly installed on the right side of the rotating end of the first motor, and the first gear meshes with the first spur gear disc; a first universal connecting pipe is installed in the upper and lower direction inside the first rotating seat, the top end of the first universal connecting pipe extends out of the upper surface of the first rotating seat and passes through the interior of the first spur gear disc and the top frame, and the right end of the first universal connecting pipe extends out of the outer surface sidewall of the first rotating seat; a flow control valve is fixedly installed in the middle of the top of the inner cavity of the dissolved gas separator, and the top end of the flow control valve is connected to the bottom end of the connector pipe; one end of the telescopic pipe is connected to the top end of the first universal connecting pipe, and the other end of the telescopic pipe is connected to the bottom end of the flow control valve.

[0007] Preferably, the liquid discharge component further includes: a first mounting arm, a first connecting pipe, a fixed base, a second rotating base, a second universal connecting pipe, a second spur gear disk, a second motor, a second gear, a second mounting arm, a second connecting pipe, and a discharge elbow; the first mounting arm is fixedly mounted on the right side below the outer surface sidewall of the first rotating base in a left-right direction; the first connecting pipe is fixedly mounted on the top of the outer surface of the first mounting arm in a left-right direction via a bracket; the fixed base is fixedly mounted on the right end of the first mounting arm; the second rotating base is rotatably mounted on the lower surface of the fixed base via a bearing; the second universal connecting pipe is installed inside the second rotating base in a vertical direction, and the top end of the second universal connecting pipe passes through the interior of the fixed base. The second spur gear is fixedly mounted on the upper side wall of the outer surface of the second rotating seat along the circumferential direction; the second motor is fixedly mounted on the lower surface of the first mounting arm; the second gear is fixedly mounted on the rotating end of the second motor, and the second gear meshes with the second spur gear; the second mounting arm is fixedly mounted on the lower left side of the outer surface of the second rotating seat along the left-right direction, and the top end of the flow control valve is connected to the bottom end of the connector pipe; the second connecting pipe is fixedly mounted on the lower surface of the second mounting arm along the left-right direction through a bracket, and one end of the second connecting pipe is connected to the bottom end of the second universal connecting pipe; the discharge elbow is fixedly mounted on the other end of the second connecting pipe.

[0008] Preferably, the liquid discharge component further includes: a vertical frame, a rotating frame, a baffle, a limiting rod, a drive rod, and an electric telescopic rod; the vertical frame is fixedly installed in the vertical direction on the rear left end of the outer surface of the second mounting arm; the rotating frame is rotatably installed on the front side of the bottom left side of the inner wall of the fixed seat via a rotating shaft; the baffle is fixedly installed on the rear side of the rotating frame; one end of the limiting rod is rotatably installed on the upper front side of the left side of the inner wall of the vertical frame via a rotating shaft; the drive rod is rotatably installed in the vertical direction on the upper right side of the outer surface of the rotating frame via a rotating shaft, and the top end of the drive rod is rotatably connected to the other end of the limiting rod via a rotating shaft; the electric telescopic rod is rotatably installed on the left side of the inner wall of the vertical frame via a rotating shaft, and the telescopic end of the electric telescopic rod is rotatably connected to the right side of the outer surface of the drive rod via a rotating shaft.

[0009] Preferably, the exhaust unit includes: a housing, an inlet pipe, an outlet pipe, and sealing gaskets; the housing is fixedly installed on the lower surface of the working platform in the vertical direction; the inlet pipe is fixedly installed on the left side of the outer surface of the housing in the horizontal direction, with the left end of the inlet pipe connected to the exhaust port of the dissolved gas separator, and the right end of the inlet pipe extending into the inner cavity of the housing; the outlet pipe is fixedly installed on the right side of the outer surface of the housing in the horizontal direction, with the left end of the inlet pipe extending into the inner cavity of the housing; the number of sealing gaskets is two, and the two sealing gaskets are respectively installed circumferentially on the outer sides of the inner ends of the inlet pipe and the outlet pipe.

[0010] Preferably, the exhaust unit further includes: a slide rail frame, a third motor, a first sliding seat, a first connecting rod, a crank, a slot, a second sliding seat, a sealing head, a connecting head, and a spring; the slide rail frame is fixedly installed in the middle of the inner cavity of the housing along the vertical direction; the third motor is fixedly installed at the top of the inner cavity of the housing and located on the outer left side of the slide rail frame; the first sliding seat is sleeved on the outer surface of the slide rail frame; one end of the first connecting rod is rotatably installed on the inner side of the first sliding seat via a rotating shaft; one end of the crank is fixedly installed on the right side of the rotating end of the third motor, and the other end of the crank is rotatably connected to the other end of the first connecting rod via a rotating shaft; there are two slots, which are respectively opened on the lower front and rear sides of the outer surface of the first sliding seat; the second sliding seat is sleeved on the lower surface of the slide rail frame; the sealing head is embedded in the upper inner part of the second sliding seat, and the left and right ends of the sealing head extend out of the outer surface of the second sliding seat; the connecting head is installed through the lower inner part of the second sliding seat along the left and right direction; one end of the spring is fixedly installed in the lower inner part of the slide rail frame, and the top end of the spring is fixedly connected to the lower surface of the second sliding seat.

[0011] Preferably, the exhaust unit further includes: a locking rod, a connecting spring, a limiting rod, a second connecting rod, a slot frame, a telescopic rod, a fifth motor, and a cam; there are two locking rods, one end of which is rotatably mounted on the upper front and rear sides of the outer surface of the second sliding seat via a rotating shaft; the front and rear ends of the connecting spring are respectively connected to the upper left side of the outer surface of the front and rear locking rods; there are two limiting rods, one end of which is respectively mounted on the left side outside the axis of the front and rear locking rods, and the front and rear limiting rods are rotated 180 degrees to coincide; the front and rear ends of the second connecting rod are respectively rotatably mounted on the outer side of the other end of the front and rear limiting rods via a rotating shaft; the slot frame is fixedly mounted on the front side of the bottom end of the slide rail frame; the telescopic rod is inserted into the inner front end of the slot frame in the front-rear direction, and the rear end of the telescopic rod contacts the bottom front side of the outer surface of the front locking rod; the fifth motor is mounted on the upper left side of the outer surface of the slot frame, and the rotating end of the fifth motor extends into the interior of the slot frame; the cam is fixedly mounted on the rotating end of the fifth motor, and the side wall of the cam contacts the front side of the telescopic rod.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. Acidic water from upstream is fed into the connector pipe via the main collection pipe and flow regulating valve. The medium sequentially passes through the flow control valve, telescopic pipe, first universal joint pipe, first connecting pipe, second universal joint pipe, and second connecting pipe, before being discharged into the dissolved gas separator through the discharge elbow. During the feeding process, the first motor drives the first rotating seat and the first universal joint pipe to rotate circumferentially via the first gear and the first spur gear disc, achieving primary liquid distribution orientation adjustment and driving the first mounting arm and the fixed seat to rotate synchronously. The second motor drives the second rotating seat and the second universal joint pipe via the second gear and the second spur gear disc. The pipe rotates circumferentially to complete the secondary liquid distribution orientation adjustment. The two sets of rotating mechanisms can operate independently or in conjunction to achieve uniform liquid distribution throughout the tank. The electric lifts on both sides drive the overall lifting of the top frame. Relying on the expansion and contraction compensation characteristics of the telescopic pipe, the pipeline is kept connected, so that the discharge elbow always follows the liquid level to keep the discharge at a low position, eliminating the impact of high-level liquid columns. At the same time, the electric telescopic rod controls the baffle to flip and guide the flow through the parallelogram mechanism composed of the drive rod, limit rod and rotating frame, buffering the kinetic energy of the water and suppressing violent disturbance of the liquid surface and secondary emulsification of oil and water. The liquid level sensor monitors the liquid level height in the tank in real time throughout the process.

[0013] 2. After the dissolved gas separator is fed, the nitrogen sealing pipeline control valve is opened to establish a slight positive pressure nitrogen seal inside the tank to isolate air and prevent sulfide oxidation and sulfur formation. The gas sensor monitors the pressure and gas status inside the tank in real time. When the exhaust unit is working, the third motor drives the crank and the first connecting rod to drive the first sliding seat to reciprocate up and down along the slide rail frame. The fifth motor drives the cam to push the telescopic rod, pushing the two side locking rods to overcome the elastic force of the connecting spring and disengage from the locking groove. The second sliding seat is in the conducting position under the action of the spring, so that the inlet pipe and the outlet pipe are connected. The hydrogen sulfide, carbon dioxide and light hydrocarbons decomposed in the tank are transported to the external incineration system through the sealed channel. When it is necessary to adjust the exhaust volume, the cam releases the telescopic rod, and the connecting spring drives the locking rod to return to the locking groove, so that the first sliding seat and the second sliding seat are linked, which drives the sealing head and the connecting head to intermittently open and close the gas path, so as to realize the time-controlled and intermittent discharge of acid gas.

[0014] This multi-stage buffering, pressure stabilizing, and homogenizing control system effectively offsets the operational shocks caused by fluctuations in upstream water volume, quality, and composition, ensuring continuous and stable feed to the downstream stripping system and enhancing the unit's resistance to load fluctuations. Through segmented stripping within the tower and multi-layer switchable ammonia extraction modes, the system can precisely select the low-sulfur, ammonia-rich zone for gas extraction based on real-time component conditions, significantly reducing the sulfur content and impurity entrainment in ammonia. This improves ammonia purification quality from the process source. Combined with a multi-stage gradient cooling and condensation mechanism, it achieves precise removal of moisture and ammonium salt impurities at each stage. The condensate can be recycled and reused without pollutant accumulation, significantly reducing the purification load on the downstream ammonia refining unit. In acidic water treatment technology, the feeding process can be made without drop impact and without severe water disturbance, suppressing secondary emulsification of oil and water from the source, greatly optimizing the static stratification effect of oil and water, reducing the risk of oil phase impurities being carried into the main tower system by the feed water, effectively avoiding problems such as foaming and flushing of the stripping tower, oil accumulation in the heat exchanger, and crystallization blockage in the pipeline. Through a time-controllable closed exhaust control method, the adaptive matching of gas phase desorption and discharge rate is achieved, ensuring sufficient degassing without disturbing the liquid phase stratification, improving the stability of raw material pretreatment and water quality uniformity, and significantly enhancing the overall advancement and engineering practicality of the entire acidic water stripping resource utilization process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the raw material pretreatment unit of the present invention; Figure 2 for Figure 1 Exploded view of the dissolved gas separation mechanism; Figure 3 for Figure 2 Exploded view of the liquid discharge component; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 for Figure 2 Exploded view of the liquid discharge component; Figure 6 for Figure 5 Enlarged view of point B; Figure 7 for Figure 5 Enlarged view of point C.

[0016] In the diagram: 1. Dissolved gas separation mechanism; 11. Base; 12. Dissolved gas separation tank; 13. Discharge pipe; 14. Liquid level sensor; 15. Connector pipe; 16. Nitrogen sealing pipeline control valve; 17. Gas sensor; 18. Working platform; 2. Liquid discharge component; 21. Electric lift; 22. Top frame; 23. First rotating seat; 24. First spur gear; 25. First motor; 26. First gear; 27. First universal joint pipe; 28. Flow control valve; 29. ​​Telescopic pipe; 210. First mounting arm; 211. First connecting pipe; 212. Fixed seat; 213. Second rotating seat; 214. Second universal joint pipe; 215. Second spur gear; 216. Second motor; 217. Second gear; 218. Second mounting arm; 219. Second connecting pipe; 220. 221. Discharge elbow, 222. Vertical frame, 223. Rotating frame, 224. Baffle, 225. Limiting rod, 226. Drive rod, 327. Electric telescopic rod, 31. Exhaust unit, 32. Housing, 33. Inlet pipe, 34. Discharge pipe, 35. Sealing gasket, 36. Slide rail frame, 37. Third motor, 38. First sliding seat, 39. First connecting rod, 310. Crank, 311. Slot, 312. Sealing head, 313. Connecting head, 314. Spring, 315. Locking rod, 316. Connecting spring, 317. Limiting rod, 318. Second connecting rod, 319. Slot frame, 320. Telescopic rod, 321. Fifth motor, 322. Cam, 4. Raw material buffer system, 5. Conveying system, 6. Buffer system, 7. Pressure-boosting filter conveying system. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-7This invention provides a technical solution: an acidic water stripping treatment device for side-stream graded ammonia extraction, characterized in that it comprises: a raw material pretreatment unit, a single-tower pressurized stripping unit, a side-stream graded condensation unit, an ammonia refining unit, and a purified water heat exchange and reuse unit connected in sequence; the stripping main tower of the single-tower pressurized stripping unit is divided into an upper deacidification section, a middle graded ammonia extraction section, and a lower deep stripping section from top to bottom; the middle graded ammonia extraction section is vertically equipped with three to five layers of independently controllable side-stream extraction outlets, each of which is individually equipped with a control valve, flow meter, and anti-crystallization heat tracing components, and can independently switch to extract ammonia-rich gas according to the feed conditions; the side-stream graded condensation unit is equipped with a three-stage series stepped condensation structure to form gradient cooling and step-by-step impurity removal. The separation system includes a raw material pretreatment unit comprising: a dissolved gas separation mechanism 1, a raw material buffer system 4, a conveying system 5, a buffer system 6, and a pressurized filtration and conveying system 7. The raw material buffer system 4 is located on the external rear side of the dissolved gas separation mechanism 1. The main body of the raw material buffer system 4 adopts a horizontal, atmospheric pressure, corrosion-resistant, and anti-corrosion buffer settling tank structure, equipped with built-in static mixing components, online oil-water interface detection instruments, automatic sludge and oil extraction components, a bottom sludge discharge and slag collection structure, and a top nitrogen sealing pipeline. The raw material buffer system 4 serves as a homogenizing settling device in the middle stage of pretreatment, used to receive the acidic water after degassing from the dissolved gas separation mechanism 1. It utilizes the large-volume tank's residence space to achieve homogenized water quality and quantity balance, and relies on density differences to complete the static three-phase oil-water-solid three-phase process. The stratification process involves adding demulsifiers to break up trace amounts of emulsified water, effectively trapping residual floating oil, light hydrocarbons, and solid silt impurities from upstream, eliminating the impact of incoming water quality fluctuations on the downstream system, and providing qualified water for subsequent pressure-stabilized transportation. The conveying system 5 is located below the raw material buffer system 4, and the two systems are connected by pipelines. The conveying system 5 employs a closed, corrosion-resistant pipeline assembly and an intelligent variable frequency auxiliary pump structure. Steam tracing and venting components are installed throughout the line. The pipeline section integrates manual shut-off valves, electric regulating valves, pressure monitoring instruments, and check valve / pressure stabilizing components. The conveying system 5 is responsible for the continuous, pressure-stabilized, and undisturbed transportation of the acidic water purified by the stratified process in the raw material buffer system 4. It can be adjusted according to the equipment requirements. The system adaptively adjusts the conveying flow rate to avoid secondary emulsification and impurity surge caused by pipeline throttling disturbances. The buffer system 6 is located on the lower left side of the dissolved gas separation unit 1. The conveying system 5 and the buffer system 6 are connected by pipelines. The buffer system 6 is a horizontal, sealed nitrogen-sealed homogenizing and stabilizing tank. The tank body is made of corrosion-resistant pressure vessel special plate and is equipped with a high-precision liquid level remote monitoring module, an over-level overflow return pipeline, a low-pressure continuous nitrogen sealing and stabilizing system, and a full-process heat tracing and insulation structure. The buffer system 6 is used to balance the fluctuations in water volume, water pressure and water quality, further stabilize the pretreated water conditions, isolate air to prevent sulfide oxidation to generate elemental sulfur and block downstream equipment, and store and buffer qualified pretreated water.The pressurized filtration and conveying system 7 is located on the outer left side of the buffer system 6. The pressurized filtration and conveying system 7 and the buffer system 6 are connected by pipelines. The pressurized filtration and conveying system 7 integrates a pre-filter precision assembly, a variable frequency pressurized conveying pump set, a mechanical seal cooling auxiliary assembly, dual-path hot and cold flow distribution pipelines, and an intelligent flow regulating instrument. The filter unit uses a detachable basket-type high-precision anti-corrosion filter screen. The pump set adopts a one-in-one-outline corrosion-resistant horizontal centrifugal pump structure. The entire system is connected to the discharge end of the buffer system 6 through a sealed feed pipeline. It is mainly used for precision impurity removal and filtration, pressure stabilization and pressurization of pretreated acidic water, while simultaneously achieving dual-path hot and cold flow distribution to match the process requirements of cold spray feeding at the top of the stripping tower and hot feeding at the middle section of the tower, and to efficiently protect the downstream heat exchanger and stripping tower internals.

[0019] As a preferred option, further, such as Figure 2As shown, the dissolved gas separation mechanism 1 includes: a base 11, a dissolved gas separation tank 12, a discharge pipe 13, a liquid level sensor 14, a connector pipe 15, a nitrogen sealing pipeline control valve 16, a gas sensor 17, a working platform 18, a liquid inlet component 2, and an exhaust unit 3; the base 11 is fixedly installed on the ground in front of the exhaust unit 3; the dissolved gas separation tank 12 is fixedly installed on the inner top of the base 11 in the vertical direction. The dissolved gas separation tank 12 is a vertical, atmospheric pressure, sealed, corrosion-resistant pressure tank. The inner wall is entirely lined with a rubber anti-corrosion structure that is resistant to hydrogen sulfide and acid and alkali corrosion. The dissolved gas separation tank 12 is designed for long-stay, stable flow conditions and is fixedly installed in the vertical direction. Installed on the top inner side of the base 11, the dissolved gas separator 12 receives upstream emulsified acidic water, providing a stable and undisturbed space for dissolved gas desorption. One end of the discharge pipe 13 is connected to the bottom discharge end of the dissolved gas separator 12, and the other end passes through the interior of the base 11 and connects to the raw material buffer system 4. The discharge pipe 13 serves as a dedicated closed-loop transport channel for the acidic water after degassing, ensuring stable discharge of homogeneous degassed water from the dissolved gas separator without disturbance, secondary emulsification, or impurity sedimentation. A level sensor 14 is installed on the outer surface sidewall of the dissolved gas separator 12; the level sensor 14 is an explosion-proof radar level sensor. The online monitoring instrument can collect real-time liquid level data in the dissolved gas separator 12, enabling dynamic online feedback of liquid level and early warning of high and low liquid levels. The connector pipe 15 is installed in the middle of the top slot of the dissolved gas separator 12, and adopts a corrosion-resistant high-pressure connecting pipe structure, serving as a pre-connection and connection component between the upstream acidic water collection main pipe and the flexible liquid distribution mechanism of the dissolved gas separator 12. The nitrogen sealing pipeline control valve 16 is installed in the left-side slot of the top of the dissolved gas separator 12, and adopts an explosion-proof, corrosion-resistant pneumatic shut-off regulating valve, used to control the on / off and pressure of the nitrogen sealing pipeline at the top of the dissolved gas separator 12. The opening degree can maintain a slightly positive pressure nitrogen sealing atmosphere inside the tank, preventing external oxygen from seeping into the tank. The gas sensor 17 is installed in a slot on the top right side of the dissolved gas separator 12. The gas sensor 17 is an explosion-proof composite online detection transmitter for toxic and harmful gases, which has the function of synchronous detection of multiple parameters such as hydrogen sulfide, combustible hydrocarbons, and tank pressure. It can monitor the concentration of gas phase components and the operating pressure inside the dissolved gas separator 12 in real time. The working platform 18 is fixedly installed on the upper side wall of the outer surface of the dissolved gas separator 12. The liquid discharge component 2 is located above the inner cavity of the dissolved gas separator 12, and the exhaust unit 3 is located above the outer surface of the dissolved gas separator 12.

[0020] As a preferred option, further, such as Figure 3 and Figure 4As shown, the liquid discharge component 2 includes: an electric lift 21, a top frame 22, a first rotating seat 23, a first spur gear 24, a first motor 25, a first gear 26, a first universal joint 27, a flow control valve 28, a telescopic pipe 29, a first mounting arm 210, a first connecting pipe 211, a fixed seat 212, a second rotating seat 213, a second universal joint 214, a second spur gear 215, a second motor 216, a second gear 217, a second mounting arm 218, a second connecting pipe 219, a discharge elbow 220, a vertical frame 221, a rotating frame 222, a baffle 223, a limit rod 224, a drive rod 225, and an electric telescopic rod 226; the electric lift 21 There are two electric lifting platforms 21, which are fixedly installed on the left and right sides of the top inner wall of the base 11 in the vertical direction. The electric lifting platforms 21 are explosion-proof precision servo electric lifting platforms. The whole machine adopts a corrosion-resistant aluminum alloy shell and stainless steel telescopic columns, which have the characteristics of high-precision positioning, low-speed stable lifting, anti-jamming, and resistance to water vapor corrosion. The two electric lifting platforms 21 are symmetrically arranged vertically and fixedly installed on the left and right sides of the top inner wall of the base 11, providing a vertical lifting displacement reference and rigid support for the upper overall top frame 22, and can realize the height adaptive adjustment of the lower discharge elbow 220; the top frame 22 is fixedly installed at the bottom of the lifting end of the two electric lifting platforms 21 in the left and right direction; the first rotation The first rotating seat 23 is rotatably mounted on the lower surface of the top frame 22 via bearings. The first rotating seat 23 adopts a hollow rotary base structure, providing a rotational mounting reference and a hollow conductive cavity for the first-stage circumferential rotary liquid distribution assembly. The first spur gear disk 24 is circumferentially fixedly mounted on the top outer side of the first rotating seat 23. The first motor 25 is fixedly mounted on the lower left side of the electric lift 21. The first motor 25 is an explosion-proof variable frequency servo motor, serving as an independent power source for the first-stage rotation. It can precisely adjust speed and control forward and reverse rotation, providing a stable and controllable input torque for the meshing rotary motion of the first spur gear disk 24 and the first gear 26. The first gear 26 is fixedly mounted on the right side of the rotating end of the first motor 25. It meshes with the first spur gear 24; the first universal connecting pipe 27 is installed at the top of the inside of the first rotating seat 23 in the vertical direction. The top of the first universal connecting pipe 27 extends out of the upper surface of the first rotating seat 23 and passes through the inside of the first spur gear 24 and the top frame 22. The right end of the first universal connecting pipe 27 extends out of the outer side wall of the first rotating seat 23. The first universal connecting pipe 27 adopts a hollow universal connecting pipe fitting, which has the characteristics of multi-angle adaptive deflection, sealing and conduction, erosion resistance and anti-crystallization. It is installed in the top of the inside of the first rotating seat 23 in the vertical direction. The side port is reserved for the transfer space. It can maintain the pipeline in a closed and conductive state under the conditions of rotation and lifting displacement to realize the medium transportation.The flow control valve 28 is fixedly installed at the top center of the inner cavity of the dissolved gas separator 12. The top of the flow control valve 28 is connected to the bottom of the connector pipe 15. The flow control valve 28 is an explosion-proof and corrosion-resistant pneumatic micro-regulating valve with high-precision opening adjustment, anti-clogging, and sulfur corrosion resistance. It is used to control the flow rate of the feed medium, stabilize pressure and throttle, achieve smooth and controllable feeding, and eliminate instantaneous large flow impact disturbances. One end of the telescopic pipe 29 is connected to the top of the first universal connector pipe 27, and the other end of the telescopic pipe 29 is connected to the bottom of the flow control valve 28. The telescopic pipe 29 adopts a corrosion-resistant stainless steel metal telescopic hose structure, with axial expansion compensation, deformation resistance, and leak-proof characteristics. It is used to compensate for the vertical displacement deviation when the top frame 22 is raised and lowered, and adaptively offset the height adjustment. The pipe undergoes tensile and compressive deformation during the joint, maintaining a sealed connection throughout the entire process; the first mounting arm 210 is fixedly mounted on the lower right side of the outer surface sidewall of the first rotating seat 23 along the left-right direction; the first connecting pipe 211 is fixedly mounted on the top of the outer surface of the first mounting arm 210 along the left-right direction via a bracket; the fixed seat 212 is fixedly mounted on the right end of the first mounting arm 210; the second rotating seat 213 is rotatably mounted on the lower surface of the fixed seat 212 via a bearing; the second universal connecting pipe 214 is installed inside the second rotating seat 213 along the up-down direction, and the top end of the second universal connecting pipe 214 passes through the interior of the fixed seat 212 and connects to the other end of the first connecting pipe 211. The second universal connecting pipe 214 can adaptively deflect its angle during the secondary rotational motion. The pipeline is continuously kept sealed to ensure stable medium delivery. A second spur gear disk 215 is fixedly mounted circumferentially above the outer sidewall of the second rotating seat 213. A second motor 216 is fixedly mounted on the lower surface of the first mounting arm 210. The second motor 216 is an explosion-proof variable frequency micro servo motor with a corrosion-resistant sealing structure suitable for the humid and corrosive environment inside the tank. As the dedicated power source for the secondary independent rotary mechanism, it can independently adjust speed and control start / stop, achieving precise control of the secondary liquid distribution trajectory. A second gear 217 is fixedly mounted on the rotating end of the second motor 216. The second gear 217 meshes with the second spur gear disk 215, forming a secondary gear transmission pair that provides stable power for the secondary circumferential rotary motion. Force input; the second mounting arm 218 is fixedly installed on the lower left side of the outer surface sidewall of the second rotating seat 213 in the left-right direction, and the top of the flow control valve 28 is connected to the bottom of the connector pipe 15; the second connecting pipe 219 is fixedly installed on the lower surface of the second mounting arm 218 in the left-right direction through the bracket, and one end of the second connecting pipe 219 is connected to the bottom of the second universal connecting pipe 214; the discharge elbow 220 is fixedly installed on the other end of the second connecting pipe 219 in a connected manner. The discharge elbow 220 adopts an integral forged anti-corrosion arc elbow structure. As the final discharge port, it can realize smooth flow guidance, weaken water impact, and adapt to low-position undisturbed liquid distribution conditions; the vertical frame 221 is fixedly installed on the rear left end of the outer surface of the second mounting arm 218 in the up-down direction;The rotating frame 222 is rotatably mounted on the front side of the bottom left side of the inner wall of the fixed base 212 via a rotating shaft; the baffle 223 is fixedly mounted on the rear side of the rotating frame 222. The baffle 223 adopts an impact-resistant and corrosion-resistant plate-type flow guide structure, which can flexibly guide and decelerate the falling water flow, weaken the kinetic energy of the incoming water, and suppress liquid surface disturbance and secondary emulsification of oil and water; one end of the limiting rod 224 is rotatably mounted on the front side of the upper left side of the inner wall of the vertical frame 221 via a rotating shaft; the drive rod 225 is rotatably mounted on the upper right side of the outer surface of the rotating frame 222 along the vertical direction via a rotating shaft. The top end of the drive rod 225 is rotatably connected to the other end of the limit rod 224 via a rotating shaft; the electric telescopic rod 226 is rotatably mounted on the left side of the inner wall of the vertical frame 221 via a rotating shaft, and the telescopic end of the electric telescopic rod 226 is rotatably connected to the right side of the outer surface of the drive rod 225 via a rotating shaft. The electric telescopic rod 226 adopts an explosion-proof precision miniature electric linear actuator, which has the characteristics of low-speed stability, accurate positioning, and strong self-locking. The electric telescopic rod 226 serves as the power source for the flipping of the baffle 223, realizing the precise adjustment of the tilt angle of the baffle 223.

[0021] As a preferred option, further, such as Figure 5 , Figure 6 and Figure 7As shown, the exhaust unit 3 includes: a housing 31, an inlet pipe 32, an outlet pipe 33, a sealing gasket 34, a slide rail frame 35, a third motor 36, a first sliding seat 37, a first connecting rod 38, a crank 39, a slot 310, a second sliding seat 311, a sealing head 312, a connecting head 313, a spring 314, a locking rod 315, a connecting spring 316, a limiting rod 317, a second connecting rod 318, a slot frame 319, a telescopic rod 320, a fifth motor 321, and a cam 322; the housing 31 is fixedly installed on the lower surface of the work platform 18 in the vertical direction. The housing 31 is a closed explosion-proof and corrosion-resistant box structure, which has the functions of dustproof, waterproof, hydrogen sulfide corrosion resistant, and explosion-proof sealing. Adaptability; the inlet pipe 32 is fixedly installed on the left side of the outer surface of the outer shell 31 along the left-right direction. The left end of the inlet pipe 32 is connected to the exhaust port of the dissolved gas separator 12, and the right end of the inlet pipe 32 extends into the inner cavity of the outer shell 31. The inlet pipe 32 enables the closed-loop discharge of acidic gas from the dissolved gas separator 12. The right end of the pipe extends into the inner cavity of the outer shell 31 to form an internal air intake channel; the outlet pipe 33 is fixedly installed on the right side of the outer surface of the outer shell 31 along the left-right direction. The left end of the inlet pipe 32 extends into the inner cavity of the outer shell 31, and the right end of the outlet pipe 33 connects to the external flare combustion pipeline, serving as a dedicated closed-loop transport channel for the discharge of regulated acidic gas, ensuring stable and safe external delivery of the gaseous medium; the number of sealing gaskets 34 Two gaskets 34 are installed circumferentially on the inner and outer sides of the inlet pipe 32 and the outlet pipe 33, respectively. The gaskets 34 are PTFE-coated corrosion-resistant and high-temperature resistant gaskets, suitable for corrosive gas phase conditions containing hydrogen sulfide and light hydrocarbons. They provide circumferential sealing of the connection gap between the inlet pipe 32 and the outlet pipe 33, preventing acid gas leakage and ensuring the overall airtightness of the exhaust system. The slide rail bracket 35 is fixedly installed vertically in the middle of the inner cavity of the outer casing 31. The third motor 36 is fixedly installed at the top of the inner cavity of the outer casing 31, located on the outer left side of the slide rail bracket 35. The third motor 36 is an explosion-proof and corrosion-resistant variable frequency speed-regulating motor, capable of stably outputting continuous rotational torque to drive the crank 39. Provides continuous power input; the first sliding seat 37 is sleeved on the outer surface of the slide rail frame 35; one end of the first connecting rod 38 is rotatably mounted on the inner side of the first sliding seat 37 via a rotating shaft, and the first connecting rod 38 serves as a power transmission component between the crank 39 and the first sliding seat 37, realizing the conversion of rotary motion to linear reciprocating motion; one end of the crank 39 is fixedly mounted on the right side of the rotating end of the third motor 36, and the other end of the crank 39 is rotatably connected to the other end of the first connecting rod 38 via a rotating shaft; there are two slots 310, which are respectively opened on the lower front and rear sides of the outer surface of the first sliding seat 37; the second sliding seat 311 is sleeved on the lower side of the outer surface of the slide rail frame 35.The sealing head 312 is embedded in the upper part of the second sliding seat 311. Both ends of the sealing head 312 extend out of the outer surface of the second sliding seat 311. The sealing head 312 uses a PTFE corrosion-resistant and wear-resistant sealing plug structure, which can be matched with the ports of the inlet pipe 32 and the outlet pipe 33 to achieve sealing, thereby cutting off the gas phase flow channel and achieving gas flow regulation. The connector 313 is installed in a through-type design along the left and right direction in the lower part of the second sliding seat 311. The connector 313 uses a hollow through-type conductive joint with a straight-through flow channel inside, which can create a complete gas phase conductive channel when the inlet pipe 32 and the outlet pipe 33 are aligned, ensuring smooth flow of acidic gas. One end of the spring 314 is fixedly installed in the lower part of the slide rail frame 35. The top end of spring 314 is fixedly connected to the lower surface of the second sliding seat 311. Spring 314 provides normal elastic return support for the second sliding seat 311, ensuring that the second sliding seat 311 is normally in the initial conductive position. There are two locking rods 315. One end of each locking rod 315 is rotatably mounted on the upper front and rear sides of the outer surface of the second sliding seat 311 via a rotating shaft. The locking rods 315 are two sets of metal locking rocker structures arranged symmetrically front and rear. As the core engagement component for the linkage locking of the first sliding seat 37 and the second sliding seat 311, the linkage and separation states of the mechanism can be switched by swinging. The front and rear ends of connecting spring 316 are respectively connected to the upper left side of the outer surface of the front and rear locking rods 315. The 16th section employs a corrosion-resistant tension spring structure, possessing stable elastic recovery and fatigue resistance, enabling automatic reset of the locking rod 315. Two limit rods 317 are used, with one end of each rod mounted on the left side outside the axis of the front and rear locking rods 315 respectively. The two limit rods 317 are rotated 180 degrees to coincide, constraining the swing stroke and angle of the locking rod 315, preventing overtravel and ensuring controllable locking action. The front and rear ends of the second connecting rod 318 are rotatably mounted on the outer sides of the other ends of the front and rear limit rods 317 via rotating shafts. The second connecting rod 318 enables synchronous linkage swing of the locking rods 315 and limit rods 317 on both sides, ensuring double-sided... The locking action is completely synchronized, eliminating unilateral force deviation and improving overall locking stability; the slot frame 319 is fixedly installed on the bottom front side of the slide rail frame 35; the telescopic rod 320 is inserted into the inner front end of the slot frame 319 in the front-rear direction, and the rear end of the telescopic rod 320 contacts the bottom front side of the outer surface of the front locking rod 315. The telescopic rod 320 can rotate with the cam 322 to achieve a linear pushing displacement in the front and rear, providing mechanical pushing force for the locking rod 315 to unlock and swing; the fifth motor 321 is installed on the upper left side of the outer surface of the slot frame 319, and the rotating end of the fifth motor 321 extends into the interior of the slot frame 319. The fifth motor 321 adopts a miniature explosion-proof and corrosion-resistant speed-regulating motor, providing an independent and controllable power source for the rotation action of the cam 322;Cam 322 is fixedly mounted on the rotating end of the fifth motor 321. The side wall of cam 322 contacts the front side of telescopic rod 320. Cam 322 adopts a high-precision contour wear-resistant cam component. The curved surface of cam 322 is in close contact with the front end of telescopic rod 320. It can output a regular pushing stroke through continuous rotary motion, realize the time-controllable linear pushing action of telescopic rod 320, and complete the time-sequence unlocking and reset switching of locking action.

[0022] The specific work steps are as follows: Step 1: Raw material pretreatment: S1. The sulfur-containing and amino acid-containing water generated upstream is collected by the main collection pipe and then introduced into the connector pipe 15 at the top of the dissolved gas separation unit 1 through the front-end flow regulating valve. When the equipment is running, the flow control valve 28 is kept open. The medium is introduced into the first connecting pipe 211 through the flow control valve 28, the adaptive telescopic pipe 29, and the first universal connecting pipe 27 with spatial turning and communication function. Then, it flows through the second universal connecting pipe 214 and the second connecting pipe 219 in sequence along the first connecting pipe 211, and finally is evenly discharged into the dissolved gas separation tank 12 through the discharge elbow 220, completing the closed feeding and conveying operation of acidic water. Throughout the process, the liquid level sensor 14 collects the liquid level data inside the dissolved gas separation tank 12 in real time, providing accurate data support for subsequent height adjustment, feed flow control, and degassing process. S2. During the continuous discharge of acidic water, the first motor 25 outputs torque to drive the first gear 26 to mesh and rotate, thereby driving the first spur gear disk 24 to rotate synchronously. This causes the first rotating seat 23 to complete a 360° rotation around the vertical central axis. Relying on the flexible connection characteristics of the first universal connecting pipe 27 and the telescopic pipe 29, the pipeline is kept in a closed and conductive state, realizing the first-level full-range circumferential adjustment. While the first rotating seat 23 rotates, it drives the first mounting arm 210 and the end fixing seat 212 to rotate synchronously. At the same time, the second motor 216 drives the second gear 21. 7. The meshing transmission drives the second spur gear disk 215 and the second rotating seat 213 to rotate independently in 360°. Relying on the spatial adaptability of the second universal connecting pipe 214, the pipeline is connected smoothly, and the second-stage circumferential liquid distribution orientation adjustment is completed. The second rotating seat 213 synchronously drives the second mounting arm 218 and the bottom rotating frame 222 to rotate as a whole. The two sets of 360° rotating mechanisms can be started, stopped and speed adjusted independently according to the feeding conditions in the tank, or they can be linked and operated in combination to realize flexible liquid distribution operation with no dead angles and arbitrary trajectory inside the dissolved gas separator 12, and eliminate the deviation defect of traditional single-point fixed feeding. S3. At the same time, the left and right electric lifting platforms 21 synchronously extend and retract to adjust the overall installation height of the top frame 22. Utilizing the extension and retraction compensation performance of the telescopic pipe 29, the pipe displacement deviation caused by the height adjustment is adaptively offset. The sealed connection between the flow control valve 28 and the first universal connecting pipe 27 is maintained throughout the process. The layout height of the discharge elbow 220 is controlled so that the discharge port of the discharge elbow 220 always follows the real-time dynamic adjustment of the liquid level in the tank, maintaining a constant low-level discharge distance above the liquid level and eliminating the impact disturbance caused by the drop of the high-level liquid column. S4. To further weaken the kinetic energy of the incoming water and suppress secondary emulsification, the electric telescopic rod 226 pushes and pulls the drive rod 225 through telescopic movement. Under the limiting constraint of the limiting rod 224, it forms a parallelogram linkage transmission structure with the rotating frame 222, driving the rotating frame 222 and the rear baffle 223 to flip to the optimal buffer angle below the discharge outlet of the discharge elbow 220. This provides flexible guidance and deceleration for the falling acidic water flow, avoiding the water flow from directly impacting the liquid surface at high speed and generating turbulent eddies and strong shearing effects. This prevents the upstream original emulsified oil and water from being further fragmented and the emulsification from worsening. S5. After the acidic water feeding operation is completed inside the dissolved gas separator 12, the system opens the nitrogen sealing pipeline control valve 16 to introduce low-pressure nitrogen to establish a micro-positive pressure nitrogen sealing environment inside the tank, isolates the outside air from entering, prevents the sulfides in the water from contacting oxygen and oxidizing to generate elemental sulfur, and avoids subsequent pipeline and tower internal component blockage failures. At the same time, the gas sensor 17 monitors the gas phase pressure and gas component concentration inside the dissolved gas separator 12 in real time to ensure safe and stable operation of the degassing condition. S6. The exhaust unit 3 starts with a controllable exhaust operation. The third motor 36 drives the crank 39 to rotate in a circular motion. Through the hinge transmission of the first connecting rod 38, the rotational motion is converted into linear reciprocating motion, driving the first sliding seat 37 to perform a basic up-and-down reciprocating motion along the upper part of the slide rail frame 35, providing a power source for exhaust flow adjustment. At the same time, the fifth motor 321 drives the cam 322 to rotate in a specific direction. The cam surface pushes the telescopic rod 320 to produce axial linear displacement. The telescopic rod 320 pushes the bottom of the front locking rod 315, causing the upper part of the front locking rod 315 to swing outward. Under the transmission and limiting cooperation of the corresponding side limiting rod 317, the second connecting rod 318 synchronously pulls the rear locking rod 315 to swing outward synchronously, so that the two sets of locking rods 315 are simultaneously swung outward. 5. Completely free from the constraint of the slot 310, the synchronous tension connecting spring 316 is stretched to put it in the energy storage tension state. At this time, the second sliding seat 311 is released from the limit lock and is stably stopped in the initial conduction position under the elastic reset action of the spring 314. The connector 313 inside the second sliding seat 311, under the sealing and adaptation action of the sealing gaskets 34 on both sides, connects the inlet pipe 32 and the outlet pipe 33 to form a closed and unobstructed gas phase flow channel. The gas phase components such as hydrogen sulfide, carbon dioxide, and light hydrocarbons dissolved in the acidic water inside the dissolved gas separator 12 are fully desorbed and released from the liquid phase and introduced into the inlet pipe 32 of the exhaust unit 3 through the exhaust port on the top of the tank. The connector 313 and the outlet pipe 33 are sealed and transported to the external flare incineration system for harmless incineration treatment. S7. When it is necessary to reduce the exhaust rate and achieve time-controlled degassing, the fifth motor 321 drives the cam 322 to rotate and release the telescopic rod 320. The telescopic rod 320 releases the pushing constraint on the locking rod 315. The connecting spring 316 pulls the two sets of locking rods 315 inward by its own elastic recoil force, and locks them into the front and rear locking grooves 310 at the bottom of the first sliding seat 37, realizing the rigid linkage locking of the first sliding seat 37 and the second sliding seat 311. The reciprocating lifting power of the first sliding seat 37 is synchronously transmitted to the second sliding seat 311, which drives the sealing head 312 and the connecting head 313 to move up and down intermittently, periodically blocking and opening the flow passage of the inlet pipe 32 and the outlet pipe 33, realizing the intermittent and time-controlled discharge of acid gas, thereby regulating the degassing pressure and degassing efficiency in the tank, and ensuring that the degassing effect is uniform and stable. S8. After degassing is completed in the dissolved gas separator 12, and dissolved acidic gas and light hydrocarbons are removed, the degassed acidic water in the dissolved gas separator 12 is discharged through the discharge pipe 13 connected to the bottom discharge end and transported to the conveying system 5. The conveying system 5 transports the degassed acidic water to the raw material buffer system 4 through the corresponding conveying pipeline. The acidic water entering the raw material buffer system 4 achieves natural stratification during static residence in the tank due to the difference in medium density and the density difference between the oil, water and solid phases. From top to bottom, it forms an upper layer of light floating oil and light hydrocarbons, a middle layer of high-purity homogeneous acidic water, and a lower layer of solid mud and salt slag sedimentation, thus achieving preliminary separation of the oil, water and solid phases. S9. The online detection sensor on the raw material buffer system 4 monitors the oil-water interface height in the tank in real time and continuously feeds back the stratification interface data. The operator controls the oil-water stratification zone in the raw material buffer system 4 to ensure the stratification effect. For conditions where the upstream material is severely emulsified and the natural stratification effect is poor, the system automatically controls the raw material buffer system 4 to open the demulsifier injection pipeline, precisely adding the demulsifier in a micro-continuous manner. Through the static mixing components in the tank, the agent is fully mixed with the emulsion water, destroying the oil-water emulsion interface film, breaking the stable emulsion system, and enhancing the oil-water separation effect. When the sensor inside the raw material buffer system 4 detects that the thickness of the upper floating oil in the tank reaches the preset collection threshold, the system controls the raw material buffer system 4 to open the demulsifier injection pipeline. The material buffer system 4 starts the sludge oil recovery operation process: First, the steam heating system of the sludge oil extraction pipeline is fully opened to preheat and insulate the pipeline throughout the entire process, effectively preventing the light oil from solidifying at low temperature and the ammonium salt crystallization from clogging the pipeline; then the sludge oil transfer pump is started, and the upper layer of pure floating oil is accurately collected through the floating oil collection weir in the tank. The floating oil is transported to the unit's dedicated sludge oil tank for temporary storage. The accumulated sludge oil is uniformly transported to the crude oil tank area of ​​the plant for centralized disposal. After a single floating oil extraction operation is completed, the sludge oil pump is shut down in time, and the unit's low temperature purified water is introduced to thoroughly flush the oil extraction branch pipe, valves, and filter screen to remove residual oil and gum from the pipe wall. The middle layer of de-oiled pure acidic water that has been de-oiled in layers is stably overflowed and output through the overflow port in the middle of the tank. S10, the homogenized de-oiled acidic water that has undergone oil and slag removal in the raw material buffer system 4 is continuously transported to the buffer system 6 via the conveying system 5. The buffer system 6, relying on the large-capacity tank structure, balances the fluctuations in water volume and water quality composition of the upstream unit, realizes the homogenization and pressure stabilization of acidic water quality and volume, eliminates instantaneous load shocks, provides stable feed conditions for the downstream stripping main tower, and ensures stable gas-liquid balance in the tower. At the same time, low-pressure nitrogen is continuously introduced into the top of the buffer system 6 to maintain a sealed nitrogen atmosphere, completely preventing oxygen from seeping into the system, preventing the oxidation of sulfides to generate elemental sulfur, and effectively preventing elemental sulfur from adhering and clogging subsequent trays, pipelines and heat exchanger equipment. S11. The acidic water, after being stabilized and homogenized by the buffer system 6, is connected to the pressurized filtration and conveying system 7 through the bottom discharge main pipe. First, it is filtered by the pre-filter built into the pressurized filtration and conveying system 7 to intercept residual silt, flocculent impurities, and small solid particles in the water, protecting the subsequent feed pump, heat exchanger, and stripping tower internals. The filtered and purified acidic water enters the raw material feed pump built into the pressurized filtration and conveying system 7. After being pressurized and stabilized by the pump body, the downstream main pipe is divided into two independent and controllable conveying branches to achieve dual-path hot and cold feed: one is cold... The feed branch is equipped with an independent flow regulating valve, which directly delivers ambient temperature acidic water to the top spray layer of the stripping tower; the second is a hot feed branch, where the medium is sent into the tube side of the shell-and-tube raw material heat exchanger and undergoes countercurrent heat exchange with the high-temperature purified water at the bottom of the tower on the shell side, fully recovering the waste heat of the purified water and reducing the steam energy consumption of the stripping tower. The system can flexibly adjust the flow ratio of the cold and hot feed branches according to the unit load, feed temperature, and tower operating conditions to maximize the waste heat recovery efficiency. The preheated high-temperature acidic water is stably sent into the feed inlet of the middle section of the stripping tower to complete the entire raw material pretreatment and conveying process. Step 2: In-tower stratified stripping separation: After thorough pretreatment for oil removal, slag removal, homogenization, and pressure stabilization, the clean acidic water is fed into the single-tower pressurized stripping main tower in a hot and cold stream ratio. High-temperature superheated steam is continuously introduced into the bottom of the tower to form a countercurrent stripping gas flow from bottom to top. This gas flows in a countercurrent manner with the liquid acidic water flowing from top to bottom, allowing for mass and heat transfer. Based on the gas-liquid equilibrium characteristics that hydrogen sulfide and carbon dioxide have a much higher volatility than ammonia, the acidic components of hydrogen sulfide and carbon dioxide in the water are fully decomposed by heating and accumulate upwards, continuously converging to the top of the tower. Finally, the water is discharged from the top pipeline and transported to the sulfur recovery unit for resource-based sulfur production. Ammonia, with its low volatility, cannot rise in large quantities with the acidic gas. Instead, it accumulates continuously in the temperature and pressure range of the middle section of the tower, forming a high-concentration, low-sulfur, ammonia-rich gas region. Based on the real-time ammonia-sulfur ratio of the feed, water quality fluctuations, and unit load conditions, the staff flexibly switches the 3rd to 5th stage side-stream extraction outlets in the middle section of the tower to accurately extract low-sulfur, high-purity, ammonia-rich gas, avoiding the high-sulfur gas phase region and minimizing the sulfur content in the ammonia. The liquid medium inside the tower continues to flow downwards, and after high-intensity steam stripping in the lower deep stripping section, residual trace amounts of ammonia and sulfides in the water are completely desorbed and removed. The bottom of the tower finally produces crude purified water with extremely low impurity content. Step 3: Three-stage stepped condensation: The ammonia-rich gas extracted from the side stream of the middle section of the stripping tower is sequentially fed into a three-stage series stepped condensation unit to achieve gradient cooling and step-by-step purification. The ammonia-rich gas first enters the first-stage condensation unit, where it is cooled to 100-110°C using the waste heat of the raw material, and initially condenses to remove most of the free water and crude ammonium salt impurities. Then it enters the second-stage water-cooled condensation unit, where it is cooled to 50-60°C by circulating water, further removing residual free water and fine ammonium salt crystals. Finally, it enters the third-stage low-temperature precision condensation unit, where it is cooled to 30-35°C for deep condensation, removing trace amounts of water, ultrafine ammonium salt impurities, and light entrained impurities. The ammonia-containing condensate of different concentrations generated during the three-stage condensation process is all recycled back to the front-end raw material pretreatment system for recycling, with no waste liquid discharged, achieving 100% recovery of ammonia resources, and obtaining high-purity gaseous ammonia with low sulfur and low water content. Step 4: Ammonia Refining and Purification: After three-stage fractional condensation, the high-purity gaseous ammonia still contains trace amounts of residual hydrogen sulfide impurities. To meet the quality standards of industrial liquid ammonia, the gaseous ammonia is sent to the ammonia refining unit for deep purification. First, it is washed countercurrently in a low-temperature concentrated ammonia water scrubbing tower to selectively remove residual hydrogen sulfide components. Then, it is washed in a crystallization adsorption tank to remove trace amounts of ammonium salt crystals and solid impurities, completing the deep purification and obtaining ultra-high purity clean gaseous ammonia. Finally, the high-purity gaseous ammonia is sent to a compression condenser unit, where it is pressurized and condensed at low temperature to prepare industrial-grade liquid ammonia with compliant purity and controllable impurities, realizing the resource recovery and utilization of pollutants. Step 5: Purified Water Reuse: The crude purified water produced at the bottom of the stripping tower contains a large amount of high-temperature waste heat. It is first sent to the raw material heat exchanger to recover the waste heat and preheat the acidic raw material water at the front end, so as to realize the system's energy cascade utilization and energy saving and consumption reduction. After heat exchange and cooling, the purified water is further cooled by air-cooling and water-cooling equipment. The effluent water quality stably meets the industrial reuse standards and biochemical influent standards. It can be directly used for plant production reuse, plant area circulating water replenishment, or sent to the biochemical system for deep treatment, so as to achieve the harmless and resource-based treatment of wastewater.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An acidic water stripping treatment device for side-stream staged ammonia extraction, characterized in that, include: The system comprises, in sequence, a raw material pretreatment unit, a single-tower pressurized stripping unit, a side-stream grading and condensation unit, an ammonia refining unit, and a purified water heat exchange and reuse unit. The single-tower pressurized stripping unit's main stripping tower is divided from top to bottom into an upper deacidification section, a middle-section grading and ammonia extraction section, and a lower deep stripping section. The middle-section grading and ammonia extraction section has three to five vertically arranged, independently controllable side-stream extraction outlets. Each outlet is individually equipped with a control valve, flow meter, and anti-crystallization heat tracing components, allowing for independent switching to extract ammonia-rich gas according to the feed conditions. The side-stream grading and condensation unit features a three-stage series cascade condensation structure, forming a gradient cooling and step-by-step impurity removal separation system. The raw material pretreatment unit includes: Dissolved gas separation mechanism (1); The raw material buffer system (4) is located on the outer rear side of the dissolved gas separation mechanism (1); A conveying system (5) is located below the raw material buffer system (4), and the conveying system (5) and the raw material buffer system (4) are connected by pipelines; A buffer system (6) is located on the lower left side of the dissolved gas separation mechanism (1), and the conveying system (5) and the buffer system (6) are connected by a pipeline; The pressurized filter delivery system (7) is located on the outside left side of the buffer system (6), and the pressurized filter delivery system (7) and the buffer system (6) are connected by pipelines.

2. The acidic water stripping treatment device for side-stream staged ammonia extraction according to claim 1, characterized in that, The dissolved gas separation mechanism (1) includes: The base (11) is fixedly installed on the ground in front of the exhaust unit (3); The dissolved gas separator (12) is fixedly installed on the top inner side of the base (11) in the vertical direction; The discharge pipe (13) is connected to the bottom discharge end of the dissolved gas separator (12) at one end, and the other end of the discharge pipe (13) passes through the interior of the base (11) and is connected to the raw material buffer system (4). A liquid level sensor (14) is installed in a connected manner on the outer surface sidewall of the dissolved gas separator (12); The connector pipe (15) is installed in a connected manner at the grooved part at the top center of the dissolved gas separator (12); The nitrogen sealing pipeline control valve (16) is installed in a connected manner at the top left slot of the dissolved gas separator (12); A gas sensor (17) is installed in a connected manner at the top right slot of the dissolved gas separator (12); The working platform (18) is fixedly installed on the outer side wall of the dissolved gas separator (12).

3. The acidic water stripping treatment device for side-stream graded ammonia extraction according to claim 2, characterized in that, The dissolved gas separation mechanism (1) further includes: The liquid discharge component (2) is located above the inner cavity of the dissolved gas separator (12); An exhaust unit (3) is disposed above the outside of the dissolved gas separator (12).

4. The acidic water stripping treatment device for side-stream staged ammonia extraction according to claim 3, characterized in that, The liquid discharge component (2) includes: Electric lifting platform (21), the number of electric lifting platforms (21) is two, and the two electric lifting platforms (21) are respectively fixedly installed on the left and right sides of the top of the inner wall of the base (11) in the vertical direction; The top frame (22) is fixedly installed at the bottom of the lifting end of the two electric lifts (21) on the left and right sides along the left and right directions; The first rotating seat (23) is rotatably mounted on the middle of the lower surface of the top frame (22) via a bearing; The first spur gear disk (24) is fixedly mounted on the top outer side of the first rotating seat (23) in the circumferential direction; The first motor (25) is fixedly installed on the left side of the lower surface of the electric lift (21); The first gear (26) is fixedly installed on the right side of the rotating end of the first motor (25), and the first gear (26) meshes with the first straight gear disk (24); The first universal connecting tube (27) is installed in the upper and lower direction inside the first rotating seat (23). The top end of the first universal connecting tube (27) extends out of the upper surface of the first rotating seat (23) and passes through the interior of the first straight gear disk (24) and the top frame (22). The right end of the first universal connecting tube (27) extends out of the outer surface sidewall of the first rotating seat (23). A flow control valve (28) is fixedly installed at the top center of the inner cavity of the dissolved gas separator (12), and the top of the flow control valve (28) is connected to the bottom of the connector pipe (15). The telescopic tube (29) is connected at one end to the top of the first universal connecting tube (27), and the other end of the telescopic tube (29) is connected to the bottom of the flow control valve (28).

5. The acidic water stripping treatment device for side-stream graded ammonia extraction according to claim 4, characterized in that, The liquid discharge component (2) further includes: The first mounting arm (210) is fixedly mounted on the right side below the outer surface sidewall of the first rotating seat (23) in the left-right direction; The first connecting tube (211) is fixedly installed on the top of the outer surface of the first mounting arm (210) along the left and right direction by a bracket; The mounting base (212) is fixedly installed at the right end of the first mounting arm (210); The second rotating seat (213) is rotatably mounted on the lower surface of the fixed seat (212) via a bearing; The second universal connector (214) is installed inside the second rotating seat (213) in the vertical direction. The top end of the second universal connector (214) passes through the interior of the fixed seat (212) and is connected to the other end of the first connector (211). The second spur gear disk (215) is fixedly mounted circumferentially above the outer surface sidewall of the second rotating seat (213); The second motor (216) is fixedly installed on the lower surface of the first mounting arm (210); The second gear (217) is fixedly installed on the rotating end of the second motor (216), and the second gear (217) meshes with the second spur gear disk (215); The second mounting arm (218) is fixedly mounted on the left side below the outer surface sidewall of the second rotating seat (213) in the left-right direction, and the top end of the flow control valve (28) is connected to the bottom end of the connector pipe (15). The second connecting pipe (219) is fixedly installed on the lower surface of the second mounting arm (218) along the left and right direction by a bracket, and one end of the second connecting pipe (219) is connected to the bottom end of the second universal connecting pipe (214); The drain elbow (220) is fixedly installed at the other end of the second connecting pipe (219).

6. The acidic water stripping treatment device for side-stream staged ammonia extraction according to claim 5, characterized in that, The liquid discharge component (2) further includes: The vertical frame (221) is fixedly installed on the rear left end of the outer surface of the second mounting arm (218) in the vertical direction; The rotating frame (222) is rotatably mounted on the front side of the bottom left side of the inner wall of the fixed base (212) via a rotating shaft; A baffle (223) is fixedly installed on the rear side of the rotating frame (222); The limiting rod (224) is rotatably mounted on the upper front side of the left side of the inner wall of the vertical frame (221) via a rotating shaft; The drive rod (225) is rotatably mounted on the upper right side of the outer surface of the rotating frame (222) via a rotating shaft in the up-down direction. The top end of the drive rod (225) is rotatably connected to the other end of the limiting rod (224) via a rotating shaft. An electric telescopic rod (226) is rotatably installed on the left side of the inner wall of the vertical frame (221) via a rotating shaft. The telescopic end of the electric telescopic rod (226) is rotatably connected to the right side of the outer surface of the drive rod (225) via a rotating shaft.

7. The acidic water stripping treatment device for side-stream graded ammonia extraction according to claim 6, characterized in that, The exhaust unit (3) includes: The outer casing (31) is fixedly installed on the lower surface of the work platform (18) in the vertical direction; The inlet pipe (32) is fixedly installed on the left side of the outer surface of the outer shell (31) in the left-right direction. The left end of the inlet pipe (32) is connected to the exhaust port of the dissolved gas separator (12), and the right end of the inlet pipe (32) extends into the inner cavity of the outer shell (31). The discharge pipe (33) is fixedly installed on the right side of the outer surface of the housing (31) in the left-right direction, and the left end of the inlet pipe (32) extends into the inner cavity of the housing (31); Two sealing gaskets (34) are installed circumferentially on the outer side of the inner end of the inlet pipe (32) and the outlet pipe (33).

8. The acidic water stripping treatment apparatus for side-stream staged ammonia extraction according to claim 7, characterized in that, The exhaust unit (3) also includes: The slide rail bracket (35) is fixedly installed in the middle of the inner cavity of the outer shell (31) in the vertical direction; The third motor (36) is fixedly installed on the top of the inner cavity of the housing (31) and located on the outer left side of the slide rail frame (35); The first sliding seat (37) is sleeved on the outer surface of the slide rail frame (35); The first connecting rod (38) is rotatably mounted on the inner side of the first sliding seat (37) via a rotating shaft at one end; One end of the crank (39) is fixedly installed on the right side of the rotating end of the third motor (36), and the other end of the crank (39) is rotatably connected to the other end of the first connecting rod (38) through a rotating shaft; The number of the card slots (310) is two, and the two card slots (310) are respectively opened on the lower front and rear sides of the outer surface of the first sliding seat (37); The second sliding seat (311) is sleeved on the lower outer surface of the slide rail frame (35); A sealing head (312) is embedded in the upper part of the second sliding seat (311), and the left and right ends of the sealing head (312) extend out of the outer surface of the second sliding seat (311); The connector (313) is installed in a through-type manner in the lower part of the second sliding seat (311) along the left and right direction; A spring (314) is fixedly installed at one end inside the slide rail frame (35) and the top end of the spring (314) is fixedly connected to the lower surface of the second sliding seat (311).

9. The acidic water stripping treatment device for side-stream graded ammonia extraction according to claim 8, characterized in that, The exhaust unit (3) also includes: Two levers (315) are provided, with one end of each lever (315) being rotatably mounted on the upper front and rear sides of the outer surface of the second sliding seat (311) via a rotating shaft. A connecting spring (316) is connected at its front and rear ends to the upper left side of the outer surface of the front and rear latches (315), respectively. Limiting rod (317), there are two limiting rods (317), one end of the two limiting rods (317) is respectively installed on the left side outside the axis of the front and rear two locking rods (315), and the front and rear limiting rods (317) are rotated 180 degrees to coincide; The second connecting rod (318) is mounted on the outer side of the other end of the two limiting rods (317) by means of a rotating shaft at its front and rear ends respectively. The slot bracket (319) is fixedly installed on the front side of the bottom end of the slide rail bracket (35); The telescopic rod (320) is inserted into the inner front end of the slot frame (319) in the front-rear direction, and the rear end of the telescopic rod (320) contacts the bottom of the front surface of the front locking rod (315). A fifth motor (321) is mounted on the upper left side of the outer surface of the slot frame (319), and the rotating end of the fifth motor (321) extends into the interior of the slot frame (319); A cam (322) is fixedly installed on the rotating end of the fifth motor (321), and the side wall of the cam (322) is in contact with the front side of the telescopic rod (320).

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