Residue vaporization system

Abstract

The application provides a residue evaporation system, which comprises an extraction tank, a first condenser, a second condenser and a steam pipeline; the steam pipeline is connected with the extraction tank; the extraction tank is provided with a temperature sensor and a pressure sensor for obtaining the internal state of the extraction tank; the first condenser comprises a cavity and a first gas inlet, a gas outlet and a liquid outlet which are communicated with the cavity respectively; the first gas inlet is communicated with the extraction tank through a first connecting pipeline; the second condenser comprises a condensing section and a collecting section which are communicated with each other; the condensing section is provided with a second gas inlet; the gas outlet is communicated with the second gas inlet through a second connecting pipeline; the liquid outlet is communicated with the collecting section through a third connecting pipeline; and the condensing section is connected with a vacuum pipeline and a venting pipeline. In the residue evaporation process, the evaporation of organic solvent vapor is reduced, the residue evaporation effect is improved, the residue evaporation time and steam are saved, and the residue evaporation cost is reduced.

Description

Technical Field

[0001] This application relates to the field of raw material extraction technology, and in particular to a slag steaming system. Background Technology

[0002] In the production of extracts, various organic solvents such as ethanol or acetone are often used to extract the effective components from plant raw materials. After the extraction is completed, the organic solvents remaining in the residue need to be recovered through a slag steaming process, so as to achieve the purpose of reducing waste and safe disposal.

[0003] Currently, most slag steaming processes use steam to evaporate ethanol under normal pressure through a bottom jacket. However, this is time-consuming and consumes a lot of steam. In addition, the slag steaming process can also lead to the escape of organic solvent vapors, increasing safety risks. Utility Model Content

[0004] This application provides a slag steaming system that saves time and steam during the slag steaming process, reduces the escape of organic solvent vapors, and improves safety.

[0005] In a first aspect, embodiments of this application provide a slag steaming system, comprising: an extraction tank, a first condenser, a second condenser, and a steam pipeline;

[0006] The steam pipeline is connected to the extraction tank, which is equipped with temperature and pressure sensors to obtain the internal conditions of the extraction tank.

[0007] The first condenser includes a chamber and a first gas inlet, a gas outlet and a liquid outlet respectively connected to the chamber. The first gas inlet is connected to the extraction tank through a first connecting pipe.

[0008] The second condenser includes a condensing section and a collecting section that are interconnected. The condensing section has a second gas inlet, and the gas outlet is connected to the second gas inlet through a second connecting pipe. The liquid outlet is connected to the collecting section through a third connecting pipe.

[0009] The condensation section is connected to a vacuum pipe and a venting pipe.

[0010] In one embodiment, the first connecting pipeline includes a first branch pipe and a second branch pipe arranged in parallel with each other. The diameter of the first branch pipe is smaller than that of the second branch pipe. A first switching valve is provided on the first branch pipe, and a second switching valve is provided on the second branch pipe.

[0011] In one embodiment, a first regulating valve is also installed on the first branch pipe.

[0012] In one embodiment, the first condenser is arranged vertically, the chamber is the shell side of the first condenser, the first gas inlet is located at the top of the first condenser, the liquid outlet is located at the bottom of the first condenser, and the gas outlet is located between the liquid outlet and the first gas inlet.

[0013] The tube side of the first condenser is used to introduce refrigerant.

[0014] In one embodiment, the distance between the end of the vacuum pipe connected to the condensation section and the bottom end of the condensation section is h, and the height of the condensation section is H, where h and H satisfy:

[0015] H / 4 ≤ h < H / 2.

[0016] In one embodiment, the extraction vessel includes a body and a jacket fitted onto the body;

[0017] The steam pipeline includes a first steam branch and a second steam branch connected in parallel. A third switch valve is installed on the first steam branch, and a fourth switch valve is installed on the second steam branch. The end of the first steam branch is connected to the jacket, and the end of the second steam branch is connected to the main body.

[0018] In one embodiment, a second regulating valve is also provided on the second steam branch, and the second regulating valve is electrically connected to the pressure sensor.

[0019] In one embodiment, two liquid level switches are installed on the collection section, and the two liquid level switches are arranged at intervals along the height direction of the collection section.

[0020] The bottom of the collection section is connected to an outlet pipe, on which a pump body is installed. Two level switches are electrically connected to the pump body.

[0021] In one embodiment, there are multiple extraction tanks and multiple first condensers, and each extraction tank is connected to a steam pipe. The multiple extraction tanks are connected to the multiple first condensers in a one-to-one correspondence.

[0022] Multiple first condensers are connected to the same second condenser.

[0023] In one embodiment, the end of the third connecting pipe away from the first condenser is provided with a third branch pipe and a fourth branch pipe that are connected in parallel. The third branch pipe is connected to the collecting section, and valves are installed on the third branch pipe and the fourth branch pipe respectively.

[0024] The slag steaming system provided in this application embodiment can supply steam to an extraction tank via a steam pipeline to steam the slag in the extraction tank. The steam escaping from the extraction tank can enter a first condenser through a first connecting pipeline for initial condensation. The condensed liquid in the first condenser directly enters the collection section of a second condenser through a third connecting pipeline, while the uncondensed gas in the first condenser enters the condensation section of the second condenser through a second connecting pipeline for secondary condensation. The steam escaping from the extraction tank can be condensed twice by the first and second condensers, improving the condensation effect and reducing the escape of organic solvent vapors. During the slag steaming process, the pressure in the extraction tank can be controlled through vacuum and venting pipelines, improving the slag steaming effect, saving steam and steam, and reducing slag steaming costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the slag steaming system provided in the embodiments of this application;

[0027] Figure 2 A flowchart of the slag steaming method for the slag steaming system provided in the embodiments of this application;

[0028] Figure 3 The control logic block diagram of the slag steaming method of the slag steaming system provided in the embodiments of this application in step S101;

[0029] Figure 4 The control logic block diagram of the slag steaming method of the slag steaming system provided in the embodiments of this application in step S102;

[0030] Figure 5 The control logic block diagram of the slag steaming method of the slag steaming system provided in the embodiments of this application in step S103.

[0031] Figure label:

[0032] 100. Extraction tank; 110. Temperature sensor; 120. Pressure sensor;

[0033] 200, First condenser; 210, First gas inlet; 220, Gas outlet; 230, Liquid outlet; 240, First refrigerant circulation pipe; 241, First refrigerant control valve;

[0034] 300. Second condenser; 310. Condensation section; 311. Second gas inlet; 320. Collection section; 330. Liquid level switch; 340. Second refrigerant circulation pipeline; 341. Second refrigerant control valve;

[0035] 410. Steam pipeline; 411. First steam branch; 412. Second steam branch; 413. Third switch valve; 414. Fourth switch valve; 415. Second regulating valve; 420. First connecting pipeline; 421. First branch pipe; 422. Second branch pipe; 423. First switch valve; 424. Second switch valve; 425. First regulating valve; 430. Second connecting pipeline; 440. Third connecting pipeline; 441. Third branch pipe; 442. Fourth branch pipe; 450. Vacuum pipeline; 451. Vacuum control valve; 460. Vent pipeline; 461. Vent control valve; 470. Liquid outlet pipeline; 471. Pump body; 480. Liquid drain pipeline; 481. Liquid drain valve. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] The general principle of the slag steaming process is to recover residual organic solvents from the slag through steam distillation. At the same time, evaporation removes organic solvents and moisture from the slag, making it drier, reducing the weight of the waste residue, facilitating subsequent processing or transportation, and avoiding safety hazards caused by residual flammable solvents in the waste residue.

[0041] Currently, most residue distillation processes use steam to evaporate ethanol under atmospheric pressure via a bottom jacket, but this is time-consuming and consumes a lot of steam. Other processes add hot water to the extraction tank and then introduce steam into the jacket to heat the water. The steam from the evaporated hot water carries away the organic solvents from the residue. This process is also time-consuming and introduces a large amount of steam, increasing the pressure for subsequent solvent distillation and recovery. Both of these existing residue distillation processes can lead to the escape of organic solvent vapors during the distillation process, increasing safety risks.

[0042] To address the aforementioned problems, this application provides a slag steaming system. This system supplies steam to an extraction tank via a steam pipeline to steam the slag in the extraction tank. Steam escaping from the extraction tank enters a first condenser through a first connecting pipeline for initial condensation. The condensed liquid in the first condenser directly enters the collection section of a second condenser through a third connecting pipeline. Uncondensed gas in the first condenser enters the condensation section of the second condenser through a second connecting pipeline for secondary condensation. The steam escaping from the extraction tank is condensed twice by the first and second condensers, improving the condensation effect and reducing the escape of organic solvent vapors. During the slag steaming process, the pressure in the extraction tank can be controlled via vacuum and venting pipelines, improving the steaming effect, saving steam and time, and reducing steaming costs.

[0043] The technical solution of the slag steaming system provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] Reference Figure 1As shown in the figure, this application provides a slag steaming system, which includes an extraction tank 100, a first condenser 200, a second condenser 300, and a steam pipeline 410. The slag can be contained inside the extraction tank 100, where it is steamed. A drain pipe 480 is connected to the bottom of the extraction tank 100, and a drain valve 481 is installed on the drain pipe 480. The draining of liquid from the extraction tank 100 can be controlled by controlling the state of the drain valve 481.

[0045] A steam pipe 410 is connected to an extraction tank 100, on which a temperature sensor 110 and a pressure sensor 120 are installed to acquire information about the internal state of the extraction tank 100. Schematic, the steam pipe 410 supplies steam to the extraction tank 100, and the steam supplied through the steam pipe 410 is used to steam the slag in the extraction tank 100. It is understood that the temperature sensor 110 acquires the internal temperature of the extraction tank 100, and the pressure sensor 120 acquires the internal pressure of the extraction tank 100. Those skilled in the art are not limited in their understanding of the specific locations of the temperature sensor 110 and the pressure sensor 120 on the extraction tank 100; they can configure them as needed.

[0046] The first condenser 200 includes a chamber and a first gas inlet 210, a gas outlet 220 and a liquid outlet 230 respectively connected to the chamber. The first gas inlet 210 is connected to the extraction tank 100 through a first connecting pipe 420.

[0047] During the slag steaming process, the steam escaping from the extraction tank 100 enters the chamber of the first condenser 200 via the first connecting pipe 420 and the first gas inlet 210. The steam exchanges heat with the refrigerant flowing in the first condenser 200 in the chamber, so that some of the steam can be condensed in the chamber. Figure 1 As shown, the gas outlet 220 of the first condenser 200 is located above the liquid outlet 230. Uncondensed vapor in the chamber can be discharged from the chamber through the gas outlet 220, and the condensate formed by the condensation of vapor in the chamber can be discharged from the chamber through the liquid outlet 230.

[0048] The second condenser 300 includes a condensing section 310 and a collecting section 320 that are interconnected. The condensing section 310 has a second gas inlet 311, a gas outlet 220 that is connected to the second gas inlet 311 through a second connecting pipe 430, and a liquid outlet 230 that is connected to the collecting section 320 through a third connecting pipe 440.

[0049] In this process, the steam entering the second condenser 300 from the first condenser 200 exchanges heat with the refrigerant flowing in the second condenser 300 in the condensing section 310. The condensate formed by the condensation of the steam in the condensing section 310 can flow into the collecting section 320. The condensate formed in the second condenser 300 can also flow into the collecting section 320 through the liquid outlet 230 and the third connecting pipe 440.

[0050] The second condenser 300 can be a vertical tube condenser, which has a high heat transfer coefficient and condensation effect. For example... Figure 1 As shown, the second condenser 300 is connected to two second refrigerant circulation pipes 340. A second refrigerant control valve 341 is installed on the second refrigerant circulation pipe 340. Refrigerant can be introduced into the tube side of the second condenser 300 through the second refrigerant circulation pipe 340. Chilled water (7℃-12℃) can be used as the refrigerant for the second condenser 300.

[0051] It is worth mentioning that the steam escaping from the extraction tank 100 can be condensed twice by the first condenser 200 and the second condenser 300, which improves the steam condensation effect, thereby reducing the escape of organic solvent vapors, which in turn reduces the number of VOCs (Volatile Organic Compounds) emission points in the workshop and improves the safety of the steam slag.

[0052] The condensation section 310 is connected to a vacuum pipe 450 and a venting pipe 460.

[0053] Schematic illustration: The end of the vacuum pipe 450 furthest from the condensing section 310 can be connected to a vacuum station. A vacuum control valve 451 can be installed on the vacuum pipe 450. By adjusting the state of the vacuum control valve 451, the vacuuming of the extraction tank 100, the first condenser 200, and the second condenser 300 can be controlled. The end of the vent pipe 460 furthest from the condensing section 310 is vented. A vent control valve 461 can be installed on the vent pipe 460. After vacuuming, the vent control valve 461 can be adjusted to control whether the extraction tank 100, the first condenser 200, and the second condenser 300 are vented. During the slag steaming process, the pressure in the extraction tank 100 can be adjusted through the vacuum pipe 450, the vent pipe 460, and the steam supply from the control steam pipe 410, achieving "pressure-variable" slag steaming.

[0054] In one possible implementation, before steaming the slag in the extraction tank 100, a vacuuming operation can be performed on the extraction tank 100 via the vacuum pipe 450. Vacuuming the extraction tank 100 loosens the slag, allowing for more thorough contact between the steam and slag during subsequent steam steaming, resulting in better performance. After vacuuming, the extraction tank 100 can be vented via the vent pipe 460. By controlling the amount of steam supplied by the steam pipe 410, a positive pressure can be created inside the extraction tank 100, ensuring sufficient contact and penetration between the steam and slag, thus solving the problem of insufficient contact due to potential steam short-circuiting during steaming. After supplying steam, the steam pipe 410 can be used to vacuum the extraction tank 100 again via the vacuum pipe 450, utilizing the residual heat in the extraction tank 100 to flash evaporate any remaining organic solvents from the slag, while simultaneously making the slag in the extraction tank 100 drier. In this way, the slag steaming system can achieve variable pressure slag steaming, which can improve slag steaming efficiency, reduce slag steaming time, and save steam consumption.

[0055] In related technologies, the organic solvent (such as ethanol) recovered from condensation using traditional slag steaming processes is only 70% or less of the concentration of the organic solvent used in the initial extraction. The slag steaming system provided in this embodiment controls the pressure in the extraction tank 100 by controlling the amount of steam supplied through the vacuum pipe 450, vent pipe 460, and steam pipe 410, achieving pressure-switched slag steaming and improving slag steaming efficiency. During the slag steaming process, organic solvent loss due to poor condensation and insufficient contact between the slag and steam is avoided, ensuring that the residual organic solvent in the slag after the steaming process is less than 1%. No water is added to the extraction tank 100 during the slag steaming process, resulting in a high concentration of recovered organic solvent; the average concentration of the recovered condensed organic solvent is not lower than the concentration of the initial organic solvent solution used in the extraction.

[0056] The slag steaming system provided in this embodiment has a low gaseous organic solvent loss rate during the slag steaming process. The organic solvent content in the exhaust gas was measured by an exhaust gas measuring instrument at the end of the vent pipe 460 away from the condensation section 310 and the end of the vacuum pipe 450 away from the condensation section 310. The results were both below 1000 PPM, while conventional slag steaming devices and processes reach more than 3000 PPM. The organic solvent loss rate is 30% of that of conventional slag steaming processes.

[0057] In one embodiment, such as Figure 1 As shown, the first connecting pipe 420 includes a first branch pipe 421 and a second branch pipe 422 arranged in parallel. The diameter of the first branch pipe 421 is smaller than the diameter of the second branch pipe 422. A first switching valve 423 is provided on the first branch pipe 421, and a second switching valve 424 is provided on the second branch pipe 422.

[0058] For example, a pneumatic ball valve can be used as the first switching valve 423, and a pneumatic butterfly valve can be used as the second switching valve 424. The connection state of the first branch pipe 421 can be adjusted by controlling the first switching valve 423, and the connection state of the second branch pipe 422 can be adjusted by controlling the second switching valve 424. In one possible implementation, the diameter of the first branch pipe 421 can be 50% of the diameter of the second branch pipe 422, and the first branch pipe 421 and the second branch pipe 422 can be located in the middle of the first connecting pipe 420.

[0059] Indicatively, during the vacuuming operation, the first switch valve 423 can be closed and the second switch valve 424 opened. Because the second branch pipe 422 has a larger diameter, the vacuuming effect can be ensured. After the vacuuming operation, the first switch valve 423 can be opened and the second switch valve 424 closed. Because the first branch pipe 421 has a smaller diameter, when steam is introduced into the extraction tank 100 through the steam pipe 410, it helps to create positive pressure in the extraction tank 100.

[0060] The above settings facilitate the creation of a vacuum or positive pressure in the extraction tank 100.

[0061] In a specific embodiment, such as Figure 1 As shown, a first regulating valve 425 is also installed on the first branch pipe 421.

[0062] Understandably, the flow rate of the first branch pipe 421 can be set by configuring the first regulating valve 425. In one possible implementation, the first regulating valve 425 can be a manual regulating valve; before the slag steaming system, the first regulating valve 425 can be pre-adjusted to an appropriate position based on commissioning experience and then fixed. In another possible implementation, the first regulating valve 425 can be an automatic or electric regulating valve; during the slag steaming process, the opening degree of the first regulating valve 425 can be adjusted according to the pressure in the extraction tank 100.

[0063] Indicatively, the first switching valve 423, the second switching valve 424, and the first regulating valve 425 define a regulating valve group. The state of the first connecting pipeline 420 can be controlled by setting the state of each valve body in the regulating valve group.

[0064] In one embodiment, such as Figure 1 As shown, the first condenser 200 is arranged vertically, the chamber is the shell side of the first condenser 200, the first gas inlet 210 is located at the top of the first condenser 200, the liquid outlet 230 is located at the bottom of the first condenser 200, and the gas outlet 220 is located between the liquid outlet 230 and the first gas inlet 210.

[0065] In this process, after steam enters the shell side of the first condenser 200 through the first connecting pipe 420 and the first gas inlet 210, the condensate formed by the steam condensation flows downward, while the steam flows upward in the shell side of the first condenser 200, thus enabling the first condenser 200 to achieve distillation.

[0066] The tube side of the first condenser 200 is used to supply refrigerant. For example, the inlet and outlet of the tube side of the first condenser 200 are each connected to a first refrigerant circulation pipe 240. A first refrigerant control valve 241 is installed on the first refrigerant circulation pipe 240, through which refrigerant (such as cooling water) can be introduced into the tube side of the first condenser 200. The first condenser 200 exchanges heat with the vapor in the shell side through the refrigerant in the tube side to condense the vapor in the shell side.

[0067] It is worth mentioning that the shell side space of the first condenser 200 is larger than that of the tube side. The shell side of the first condenser 200 is used to accommodate steam, which facilitates heat exchange between the steam and the refrigerant in the tube side.

[0068] In a specific embodiment, such as Figure 1 As shown, the distance between the end of the vacuum pipe 450 connected to the condensing section 310 and the bottom of the condensing section 310 is h, and the height of the condensing section 310 is H. h and H satisfy: H / 4 ≤ h < H / 2.

[0069] Understandably, the interface for connecting the condenser section 310 to the vacuum pipe 450 is positioned near the bottom of the condenser section 310. For example, the value of h can be equal to H / 3 or H / 4, etc. When h ≥ H / 2, it is difficult to guarantee the vacuum level of the second condenser 300 during the vacuuming process, which may affect the condensation effect of the second condenser 300; when h < H / 4, the height of the interface for connecting the condenser section 310 to the vacuum pipe 450 is too low, and the condensate formed by steam condensation may flow out from this interface.

[0070] With the above settings, the vacuuming and condensation effects of the second condenser 300 are guaranteed, while preventing the condensate in the second condenser 300 from flowing into the vacuuming pipe 450.

[0071] In one embodiment, the extraction tank 100 includes a body and a jacket fitted onto the body. The body of the extraction tank 100 is capable of containing slag, and the jacket has a cavity into which steam is introduced to heat the body.

[0072] The steam pipeline 410 includes a first steam branch 411 and a second steam branch 412 arranged in parallel. A third switch valve 413 is provided on the first steam branch 411, and a fourth switch valve 414 is provided on the second steam branch 412. The end of the first steam branch 411 is connected to the jacket, and the end of the second steam branch 412 is connected to the main body.

[0073] Schematic illustration: Steam pipeline 410 also includes a main steam line, with the ends of the first steam branch 411 and the second steam branch 412 connected to the main steam line, respectively. The end of the first steam branch 411 furthest from the main steam line is connected to the jacket, and the end of the second steam branch 412 furthest from the main steam line can be connected to the bottom of the main body. Steam can be introduced into the cavity of the jacket through the first steam branch 411, and this steam can heat the main body of the extraction tank 100. Steam can be directly introduced into the main body of the extraction tank 100 through the second steam branch 412 to steam the slag in the main body.

[0074] For example, the third switching valve 413 and the fourth switching valve 414 can be angle seat valves. The third switching valve 413 can control the connection state of the first steam branch 411, and the fourth switching valve 414 can control the connection state of the second steam branch 412.

[0075] In this structure, the steam provided by the second steam branch 412 can be used to steam the slag in the extraction tank 100, and the steam provided by the first steam branch 411 can be used to heat the extraction tank 100, which can ensure the efficiency of slag steaming.

[0076] In one possible implementation, a second regulating valve 415 is also provided on the second steam branch 412, and the second regulating valve 415 is electrically connected to the pressure sensor 120.

[0077] For example, the slag steaming system is equipped with a controller that can control the slag steaming process. The second regulating valve 415 and the pressure sensor 120 are electrically connected to the controller. When the controller detects a low pressure in the extraction tank 100 via the pressure sensor 120, it can increase the opening of the second regulating valve 415 to increase the steam flow rate; when the controller detects a high pressure in the extraction tank 100 via the pressure sensor 120, it can decrease the opening of the second regulating valve 415 to decrease the steam flow rate.

[0078] In this embodiment, the pressure sensor 120 is interlocked with the second regulating valve 415 to form a PID control (Proportional-Integral-Derivative Control). By adjusting the opening of the second regulating valve 415, the pressure inside the extraction tank 100 is maintained at the set value, thereby achieving precise adjustment of the pressure inside the extraction tank 100 and ensuring the efficiency of the slag.

[0079] In one possible implementation, the slag steaming system is equipped with an operating panel with a stop button. When the operator presses the stop button or when a valve or instrument in the slag steaming system malfunctions, the controller closes all valves in the slag steaming system, and the slag steaming system stops.

[0080] Optionally, the slag steaming system is equipped with alarms, such as alarm lights and buzzers. When a malfunction occurs in the slag steaming system, the system stops operating, the alarm lights illuminate, and the buzzer sounds to alert the operator to check the alarm status and handle the situation manually.

[0081] In one embodiment, such as Figure 1 As shown, two level switches 330 are installed on the collection section 320, and the two level switches 330 are arranged at intervals along the height direction of the collection section 320. The two level switches 330 can serve as high and low level switches respectively. Those skilled in the art can set the specific positions of each level switch 330 on the collection section 320 and the height difference between the two level switches 330 as needed; no single limitation is made here. When the liquid level in the collection section 320 reaches the position of a level switch 330, the level switch 330 can send a signal.

[0082] The bottom of the collecting section 320 is connected to an outlet pipe 470, on which a pump body 471 is installed. Two level switches 330 are electrically connected to the pump body 471. Understandably, the pump body 471 can drive the condensate in the collecting section 320 to be discharged through the outlet pipe 470. Optionally, the pump body and each level switch 330 are electrically connected to a controller.

[0083] During operation of the slag removal system, when the liquid level in the collection section 320 reaches the upper liquid level switch 330 (high liquid level switch 330), the high liquid level switch 330 sends a signal to the controller. Upon receiving the signal from the high liquid level switch 330, the controller controls the pump body 471 to operate, discharging the condensate from the collection section 320 through the outlet pipe 470. When the liquid level in the collection section 320 drops to the lower liquid level switch 330 (low liquid level switch 330), the low liquid level switch 330 sends a signal to the controller. Upon receiving the signal from the low liquid level switch 330, the controller shuts down the pump body 471.

[0084] In this embodiment, the pump body 471 on the liquid outlet pipe 470 is interlocked with the two liquid level switches 330 on the collection section 320, which can automatically start and stop the pump body 471 according to the high and low liquid level signals to realize automatic liquid discharge.

[0085] In one embodiment, such as Figure 1 As shown, there are multiple extraction tanks 100 and multiple first condensers 200. Each extraction tank 100 is connected to a steam pipe 410, and the multiple extraction tanks 100 are connected to the multiple first condensers 200 in a one-to-one correspondence. The number of extraction tanks 100 is the same as the number of first condensers 200. Those skilled in the art can set the specific number of extraction tanks 100 and first condensers 200 as needed; no single limitation is made here. It is understood that each extraction tank 100 is connected to the corresponding first condenser 200 through a first connecting pipe 420.

[0086] Multiple first condensers 200 are connected to the same second condenser 300. The gas outlet 220 of each first condenser 200 is connected to the second gas inlet 311 of the second condenser 300 through a second connecting pipe 430, and the liquid outlet 230 of each first condenser 200 is connected to the collection section 320 of the second condenser 300 through a third connecting pipe 440.

[0087] In this embodiment, the amount of slag produced per slag extraction cycle can be increased by using multiple extraction tanks 100. Multiple extraction tanks 100 share a single second condenser 300 for condensation, which, while ensuring steam condensation efficiency, helps save on the cost and space required by the slag extraction system.

[0088] In one possible implementation, such as Figure 1 As shown, the third connecting pipe 440 is provided with a third branch pipe 441 and a fourth branch pipe 442 arranged in parallel at the end away from the first condenser 200. The third branch pipe 441 is connected to the collecting section 320, and valves are installed on the third branch pipe 441 and the fourth branch pipe 442 respectively.

[0089] The condensate in the first condenser 200 can flow into the collection section 320 of the second condenser 300 via the third branch pipe 441, and the condensate in the first condenser 200 can be discharged via the fourth branch pipe 442. The valve on the third branch pipe 441 can control the connection state of the third branch pipe 441, and the valve on the fourth branch pipe 442 can control the connection state of the fourth branch pipe 442.

[0090] In this embodiment, during the slag slurry ...

[0091] Reference Figures 1 to 5 As shown in the embodiments of this application, a method for steaming slag in a slag steaming system is also provided.

[0092] Taking ethanol-water solution extraction as an example, the direct steam slag extraction method is based on the difference in boiling points between ethanol and water (ethanol boiling point 78.3℃, water boiling point 100℃) and the gas-liquid equilibrium of water and ethanol solutions. The residue contains a certain proportion of ethanol and water. When the residue is heated with steam, the concentration of ethanol in the volatilized gas phase is higher than the concentration of ethanol remaining in the liquid phase of the residue. Utilizing this principle, the residue is continuously heated with steam. Part of the heating steam condenses into a liquid phase, releasing heat, causing the ethanol in the liquid phase of the residue to continuously volatilize into a gas phase. This gas phase is then condensed into a liquid phase by the first condenser 200 and the second condenser 300 for recovery.

[0093] The method for steaming slag provided in this embodiment includes:

[0094] S101: Vacuum the extraction tank 100 through the vacuum pipe 450, control the first condenser 200 and the second condenser 300 to be circulated with refrigerant respectively, and after the temperature obtained by the temperature sensor 110 is lower than the first preset temperature, continue for the first preset time, and end the vacuuming of the extraction tank 100.

[0095] Specifically, before vacuuming, ensure that the drain valve 481 is closed. Open the first refrigerant control valve 241 and the second refrigerant control valve 341 to allow refrigerant to flow into the first condenser 200 and the second condenser 300 respectively. After a first set time delay, open the vacuum control valve 451 and the second switch valve 424 to vacuum the extraction tank 100, the first condenser 200, and the second condenser 300. As the interior of the extraction tank 100 is gradually evacuated, the internal temperature of the extraction tank 100 gradually decreases. After the temperature obtained by the temperature sensor 110 is lower than the first preset temperature T1, the vacuuming of the extraction tank 100 continues for a first preset time t1, ending the vacuuming process. The specific values ​​of the first preset temperature T1, the first preset time t1, and the first set time can be set according to actual needs and are not limited here. For example, during the first vacuuming of the extraction tank 100, the pressure in the extraction tank 100 can be between -0.075 MPa and -0.06 MPa.

[0096] S102: The pressure inside the extraction tank 100 is brought to atmospheric pressure through the vent pipe 460, and steam is supplied to the extraction tank 100 through the steam pipe 410 to control the pressure inside the extraction tank 100 to reach the preset pressure. After the temperature obtained by the temperature sensor 110 reaches the second preset temperature, it continues for a second preset time to obtain the sample from the first condenser 200, test the sample concentration, and stop supplying steam to the extraction tank 100 after the concentration reaches the preset concentration.

[0097] For example, after vacuuming is completed, the vacuum control valve 451 and the second switching valve 424 are closed, and the first switching valve 423 is opened. The venting control valve 461 is opened to restore the extraction tank 100 to normal pressure. After the pressure sensor 120 detects that the pressure in the extraction tank 100 has returned to normal pressure, the venting control valve 461 is closed. The fourth switching valve 414 and the second regulating valve 415 are opened to allow steam to flow directly into the extraction tank 100 from the bottom. The third switching valve 413 is opened to heat the extraction tank 100. The pressure sensor 120 on the extraction tank 100 is interlocked with the second regulating valve 415 to form a PID control. By controlling the opening degree of the second regulating valve 415, the pressure inside the extraction tank 100 is maintained at a set value, so that the gas pressure inside the extraction tank 100 is maintained at a slightly positive pressure (0.03MPa-0.06MPa). By applying a slight positive pressure inside the extraction tank 100, the steam can be uniformly distributed within the tank, ensuring sufficient contact and penetration between the steam and the slag. This solves the problem of insufficient steam contact with the slag during the slag-steaming process, which may result in short-circuiting. After the temperature sensor 110 on the extraction tank 100 detects that the internal temperature has reached a second preset temperature T2 (e.g., 110℃-114℃) and remained there for a second preset time t2, a sample of the condensate from the first condenser 200 is taken to test the concentration of the organic solvent in the sample. If the concentration is within acceptable limits, the direct steam slag-steaming process ends; if the concentration is not within acceptable limits, slag-steaming continues for another second preset time, and the test is repeated, and so on. Once the concentration of the organic solvent in the sample is within acceptable limits, the fourth direct-flow valve 414 and the second regulating valve 415 are closed, as are the fourth valve 414, the second regulating valve 415, and the third valve 413.

[0098] The specific values ​​of the second preset temperature T2 and the second preset time t2 can be set as needed, and are not limited here.

[0099] S103: Vacuum the extraction tank 100 again through the vacuum pipe 450. After the temperature obtained by the temperature sensor 110 is lower than the third preset temperature, continue for the third preset time, and then stop the slag steaming.

[0100] For example, the fourth switch valve 414 and the second regulating valve 415 are closed, and the third switch valve 413 is closed, thus ending the direct steam slag removal process. The second switch valve 424 is opened, and the first switch valve 423 is closed. The vacuum control valve 451 is opened again to create a vacuum in the extraction tank 100, forming a negative pressure. The residual heat in the extraction tank 100 is used to flash evaporate the remaining organic solvent, making the slag in the extraction tank 100 drier. The vacuuming is stopped when the temperature obtained by the temperature sensor 110 on the extraction tank 100 does not exceed the third preset temperature T3 (e.g., 50°C) and continues for a third preset time t3 (e.g., 3 minutes). After the vacuuming is completed, the vacuum control valve 451 and the second switch valve 424 are closed, and the venting control valve 461 is opened. The venting control valve 461 is closed after the pressure obtained by the pressure sensor 120 reaches atmospheric pressure. After a second set time delay, the first refrigerant control valve 241 and the second refrigerant control valve 341 are closed. Slag removal is complete.

[0101] The specific values ​​of the third preset temperature T3, the third preset time t3, and the second set time can be set as needed and are not limited here. When the extraction tank 100 is evacuated again, the pressure in the extraction tank 100 can be between -0.075MPa and -0.06MPa.

[0102] The slag steaming method of the slag steaming system provided in this embodiment controls the pressure inside the extraction tank 100 by alternating between vacuuming and direct steam supply, switching between vacuum, slightly positive pressure, and vacuum. Based on the slag steaming stage, the first steam branch 411 and the second steam branch 412 of the steam pipeline 410 are automatically controlled to supply steam to the extraction tank 100, completing the pressure-switching slag steaming process. Using the above-described slag steaming method, the slag steaming system achieves better slag steaming efficiency, lower steam consumption, and reduced slag steaming costs.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A slag steaming system, characterized in that, include: Extraction tank, first condenser, second condenser, and steam piping; The steam pipeline is connected to the extraction tank, and the extraction tank is equipped with a temperature sensor and a pressure sensor for acquiring the internal state of the extraction tank. The first condenser includes a chamber and a first gas inlet, a gas outlet, and a liquid outlet respectively connected to the chamber. The first gas inlet is connected to the extraction tank through a first connecting pipe. The second condenser includes a condensation section and a collection section that are interconnected. The condensation section has a second gas inlet, the gas outlet is connected to the second gas inlet through a second connecting pipe, and the liquid outlet is connected to the collection section through a third connecting pipe. The condensation section is connected to a vacuum pipe and a venting pipe.

2. The slag steaming system according to claim 1, characterized in that, The first connecting pipeline includes a first branch pipe and a second branch pipe arranged in parallel. The diameter of the first branch pipe is smaller than that of the second branch pipe. A first switching valve is provided on the first branch pipe, and a second switching valve is provided on the second branch pipe.

3. The slag steaming system according to claim 2, characterized in that, The first branch pipe is also equipped with a first regulating valve.

4. The slag steaming system according to claim 1, characterized in that, The first condenser is arranged vertically, the chamber is the shell side of the first condenser, the first gas inlet is located at the top of the first condenser, the liquid outlet is located at the bottom of the first condenser, and the gas outlet is located between the liquid outlet and the first gas inlet; The tube side of the first condenser is used to introduce refrigerant.

5. The slag steaming system according to claim 4, characterized in that, The distance between the end of the vacuum pipe connected to the condensation section and the bottom end of the condensation section is h, and the height of the condensation section is H. h and H satisfy the following: H / 4 ≤ h < H / 2.

6. The slag steaming system according to claim 1, characterized in that, The extraction tank includes a body and a jacket fitted onto the body; The steam pipeline includes a first steam branch and a second steam branch connected in parallel. A third switch valve is provided on the first steam branch, and a fourth switch valve is provided on the second steam branch. The end of the first steam branch is connected to the jacket, and the end of the second steam branch is connected to the main body.

7. The slag steaming system according to claim 6, characterized in that, A second regulating valve is also provided on the second steam branch, and the second regulating valve is electrically connected to the pressure sensor.

8. The slag steaming system according to claim 1, characterized in that, Two liquid level switches are installed on the collection section, and the two liquid level switches are arranged at intervals along the height direction of the collection section. The bottom end of the collection section is connected to a liquid outlet pipe, and a pump body is installed on the liquid outlet pipe. The two liquid level switches are electrically connected to the pump body respectively.

9. The slag steaming system according to claim 1, characterized in that, There are multiple extraction tanks and multiple first condensers. Each extraction tank is connected to a steam pipe. The multiple extraction tanks are connected to the multiple first condensers in a one-to-one correspondence. Multiple first condensers are each connected to the same second condenser.

10. The slag steaming system according to claim 1, characterized in that, The third connecting pipe is provided with a third branch pipe and a fourth branch pipe arranged in parallel at the end away from the first condenser. The third branch pipe is connected to the collecting section, and valves are installed on the third branch pipe and the fourth branch pipe respectively.

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