A reflux drum for an MTBE unit

Abstract

The present invention relates to the technical field of chemical equipment, and particularly to a reflux tank for an MTBE device. It includes: a bracket; a tank body fixedly connected to the bracket, and a delivery pump is installed on the bracket; a partition fixedly connected inside the tank body and dividing the tank body into an upper cavity and a lower cavity; two liquid level sensors respectively fixedly connected to the tank body and the partition, the liquid level sensor on the tank body is located in the upper cavity, and the liquid level sensor on the partition is located in the lower cavity; a communication component arranged on the partition for communicating the upper cavity and the lower cavity. By dividing the tank body into an upper cavity and a lower cavity, the condensate first enters the upper cavity and then flows into the lower cavity at the same flow rate as that entering the rectification column from the lower cavity, thereby isolating the influence of the fluctuation of the condensation rate on the liquid level of the condensate, stabilizing the reflux ratio, and improving the purification accuracy of MTBE.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, and particularly relates to a reflux tank for an MTBE device. Background Art

[0002] MTBE (methyl tert-butyl ether) is a commonly used gasoline additive, mainly used to increase the octane number of gasoline and reduce harmful substances in vehicle exhaust emissions. It is mainly produced by the reaction of isobutene and methanol under the action of an acidic catalyst. During the MTBE synthesis process, in addition to the target product MTBE, there are also unreacted methanol, isobutene, and other C4 hydrocarbon components. To obtain pure MTBE, it is necessary to pass through a distillation column for purification. The main function of the reflux tank is to receive the liquid condensed from the distillation column condenser. These liquids are usually mixtures of light components. At the same time, the liquid level controller in the reflux tank monitors the liquid level height in real time and adjusts the reflux ratio and product withdrawal amount according to the set value (the reflux ratio refers to the ratio of the reflux liquid volume to the product withdrawal amount, which is one of the important parameters affecting the separation effect of the distillation column) to ensure the stability of the liquid level height. However, during the reflux process of the existing reflux tank, the instability of the refrigerant temperature in the condenser will cause fluctuations in the condensation rate of the volatile component mixture in the condenser, and then cause fluctuations in the liquid level in the reflux tank. The instability of the liquid level in the reflux tank will cause fluctuations in the pumping pressure, resulting in changes in the pumping volume and inaccurate reflux ratio, affecting the purification accuracy of MTBE. Summary of the Invention

[0003] In order to overcome the above-mentioned drawbacks in the background art, the present invention provides a reflux tank for an MTBE device.

[0004] The technical implementation scheme of the present invention is: a reflux tank for an MTBE device, comprising:

[0005] A support;

[0006] A tank body, fixedly connected to the support, and a transfer pump is installed on the support;

[0007] A partition, fixedly connected inside the tank body and dividing the tank body into an upper cavity and a lower cavity. The tank body is fixedly connected with a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe of the tank body is communicated with the upper cavity, the lower cavity is communicated with the liquid outlet pipe of the tank body, and the transfer pump is communicated with the liquid outlet pipe of the tank body;

[0008] Two liquid level sensors, respectively fixedly connected to the tank body and the partition. The liquid level sensor on the tank body is located in the upper cavity, and the liquid level sensor on the partition is located in the lower cavity;

[0009] A connecting component, disposed on the partition plate, for communicating the upper cavity and the lower cavity.

[0010] Furthermore, the connecting component includes:

[0011] A connecting cylinder, fixedly connected to the partition plate, the connecting cylinder is located in the lower cavity and fits with the tank body, the connecting cylinder communicates with the upper cavity, the connecting cylinder is provided with a plurality of communication ports for communicating the connecting cylinder with the lower cavity, and the connecting cylinder is provided with an adjusting component for changing the communication area between the upper cavity and the lower cavity.

[0012] Furthermore, the adjusting component includes:

[0013] A first sealing plate, fixedly connected to the connecting cylinder;

[0014] A second sealing plate, rotatably connected to the connecting cylinder and fitting with the first sealing plate, both the first sealing plate and the second sealing plate are provided with a plurality of connecting holes arranged in an annular array, the second sealing plate is used to block the connecting holes on the first sealing plate, and the connecting holes of the first sealing plate and the connecting holes of the second sealing plate are used to communicate the connecting cylinder with the upper cavity;

[0015] A driving component, disposed on the tank body, for driving the second sealing plate to rotate along the connecting cylinder.

[0016] Furthermore, the connecting cylinder is provided with a plurality of constant pressure holes, and the constant pressure holes are inclined, the height of one end of the constant pressure hole close to the central axis of the connecting cylinder is lower than the other end, and the constant pressure holes are located between the first sealing plate and the communication ports.

[0017] Furthermore, the driving component includes:

[0018] A first motor, the tank body is fixedly connected with a fixing frame, and the first motor is fixedly connected to the fixing frame of the tank body;

[0019] A connecting sleeve, fixedly connected to the second sealing plate, and the tank body is in sealed rotational connection with the connecting sleeve;

[0020] There are two transmission gears, respectively fixedly connected to the output shaft of the first motor and the connecting sleeve, and the two transmission gears are meshed.

[0021] Furthermore, it further includes:

[0022] A stirring component, disposed on the tank body, for accelerating the liquid in the connecting cylinder to enter the lower cavity, and the stirring component includes:

[0023] The second motor is fixedly connected to the fixing frame of the tank body;

[0024] The transmission shaft is fixedly connected to the output shaft of the second motor, and the transmission shaft is rotatably connected to the first sealing plate, the second sealing plate and the connecting sleeve;

[0025] The sliding sleeve is slidably connected to the transmission shaft, and a plurality of stirring plates are arranged between the sliding sleeve and the transmission shaft;

[0026] The self-adjusting component is arranged on the connecting cylinder and is used to make the communication aperture of the communication port change synchronously with the liquid level of the lower cavity.

[0027] Furthermore, the stirring plate is a multi-stage telescopic plate for adapting to the change of the height of the sliding sleeve.

[0028] Furthermore, the self-adjusting component includes:

[0029] The floating buoy is slidably connected to the connecting cylinder;

[0030] The flexible cloth is fixedly connected between the floating buoy and the connecting cylinder;

[0031] The connecting block is fixedly connected to the floating buoy and is in limit rotational connection with the sliding sleeve.

[0032] Furthermore, it also includes:

[0033] The deflection component is arranged in the transmission shaft and is used to drive the stirring plate to deflect. The deflection component includes:

[0034] The sliding part is slidably connected to the transmission shaft. A cable is fixedly connected between the stirring plate and the sliding part. The stirring plate is rotatably connected to both the sliding sleeve and the transmission shaft, and an elastic element is arranged between the stirring plate and the transmission shaft;

[0035] The pushing component is arranged on the fixing frame of the tank body and is used to drive the sliding part to move along the transmission shaft.

[0036] Furthermore, the pushing component includes:

[0037] The driving gear is rotatably connected to the fixing frame of the tank body, and the driving gear is meshed with any one of the transmission gears;

[0038] The rotating shell is fixedly connected to the driving gear, and an inclined sliding groove is arranged on the rotating shell;

[0039] The spline shaft is fixedly connected to the fixing frame of the tank body. The spline shaft is spline-connected with a clamping block. The clamping block slides in the inclined sliding groove, and the clamping block is in limit sliding connection with the sliding part.

[0040] The present invention has the following advantages: 1. By dividing the tank body into an upper cavity and a lower cavity, the condensate first enters the upper cavity and then flows into the lower cavity at the same flow rate as that entering the rectification column from the lower cavity, thereby isolating the influence of the condensate rate fluctuation on the condensate liquid level, stabilizing the reflux ratio, and improving the MTBE purification accuracy.

[0041] 2. By making the condensate in the connecting cylinder and the condensate in the lower cavity form a communicating vessel, the ripples formed by the condensate entering the lower cavity under gravity are isolated in the connecting cylinder, keeping the liquid level of the condensate in the lower cavity stable and static, thereby further stabilizing the reflux ratio of the device to the rectification column and improving the MTBE purification accuracy.

[0042] 3. When the condensate in the lower cavity is at different heights, the aperture of the communication port connecting the connecting cylinder and the lower cavity is always at a relatively maximum value, ensuring that the condensate in the connecting cylinder can flow into the lower cavity in time and keeping the liquid level of the lower cavity stable.

[0043] 4. By making several stirring plates push the condensate in the connecting cylinder to quickly discharge along the communication port, the time for the condensate in the connecting cylinder to enter the lower cavity is reduced, the stability of the liquid level of the condensate in the lower cavity is improved, and at the same time, the height of the stirring plates automatically changes with the liquid level of the condensate in the lower cavity, avoiding the rotation of the stirring plates from interfering with the flow of the condensate from the upper cavity to the lower cavity.

[0044] 5. When the flow aperture of the connecting cylinder changes, the stirring plates are synchronously deflected, reducing the contact area between the stirring plates and the water flow, reducing the load of the second motor and the acting force of the stirring plates, and prolonging the service life of both. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0046] Figure 2 is a three-dimensional structural sectional schematic diagram of the tank body of the present invention;

[0047] Figure 3 is a three-dimensional structural schematic diagram of the connecting cylinder and the partition plate of the present invention;

[0048] Figure 4 is a three-dimensional structural sectional schematic diagram of the connecting cylinder of the present invention;

[0049] Figure 5 is a three-dimensional structural schematic diagram of the connecting sleeve and the transmission gear of the present invention;

[0050] Figure 6 is a three-dimensional structural schematic diagram of the transmission shaft and the sliding sleeve of the present invention;

[0051] Figure 7Schematic three-dimensional structure diagram of the drive gear and the rotating housing of the present invention;

[0052] Figure 8 Schematic three-dimensional structure diagram of the inclined chute and the clamping block of the present invention;

[0053] Figure 9 Schematic three-dimensional structure diagram of the cable and the elastic element of the present invention.

[0054] Meanings of the reference numerals in the figure: 1: support, 2: tank body, 3: transfer pump, 4: partition board, 5: upper cavity, 6: lower cavity, 7: liquid level sensor, 201: connecting cylinder, 202: communication port, 203: first sealing plate, 204: second sealing plate, 205: constant pressure hole, 301: first motor, 302: connecting sleeve, 303: transmission gear, 401: second motor, 402: transmission shaft, 403: sliding sleeve, 404: stirring plate, 501: float, 502: flexible cloth, 503: connecting block, 601: sliding member, 602: cable, 603: elastic element, 604: drive gear, 605: rotating housing, 606: inclined chute, 607: spline shaft, 608: clamping block. Detailed implementation manners

[0055] Reference to an embodiment in this text means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0056] During the reflux process of the existing reflux tank, the refrigerant temperature in the condenser is unstable, which will cause fluctuations in the condensation rate of the volatile component mixture by the condenser. Such fluctuations will cause changes in the liquid level in the reflux tank, resulting in an unstable liquid level. The instability of the liquid level will cause fluctuations in the pumping pressure, thereby causing changes in the pumping volume, and ultimately affecting the precise control of the reflux ratio, which will reduce the purification accuracy of MTBE.

[0057] A reflux tank for an MTBE device, as Figures 1-3As shown in the figure, it includes: a bracket 1; a tank body 2 fixedly connected to the bracket 1, and a transfer pump 3 is installed on the bracket 1; a partition plate 4 fixedly connected inside the tank body 2, which divides the tank body 2 into an upper cavity 5 and a lower cavity 6. The tank body 2 is fixedly connected with a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe of the tank body 2 is communicated with the upper cavity 5, the lower cavity 6 is communicated with the liquid outlet pipe of the tank body 2, and the transfer pump 3 is communicated with the liquid outlet pipe of the tank body 2; two liquid level sensors 7 are respectively fixedly connected to the tank body 2 and the partition plate 4. The liquid level sensor 7 on the tank body 2 is located in the upper cavity 5, and the liquid level sensor 7 on the partition plate 4 is located in the lower cavity 6; a communication component is arranged on the partition plate 4 for communicating the upper cavity 5 and the lower cavity 6.

[0058] In the above solution, the materials of the bracket 1 and the tank body 2 are stainless steel, which have good corrosion resistance, smooth surfaces, and are easy to clean and maintain. The transfer pump 3 is a centrifugal pump with a wide flow range, simple structure, and easy to maintain. The liquid inlet pipe of the tank body 2 is connected to a condenser, and the transfer pump 3 is connected to a rectification column (for the specific connection method, refer to the working process of the rectification column system, and no further elaboration will be made here). The partition plate 4 is located in the upper part of the tank body 2, making the volume of the upper cavity 5 smaller than that of the lower cavity 6. At the same time, two exhaust pipes are fixedly connected to the top of the tank body 2, and the two exhaust pipes are respectively communicated with the upper cavity 5 and the lower cavity 6 for discharging the gases in the two cavities. The two liquid level sensors 7 are respectively used to detect the liquid level changes of the condensate in the upper cavity 5 and the lower cavity 6, so as to realize intelligent control and accurately adjust the reflux ratio of the rectification column. By dividing the tank body 2 into the upper cavity 5 and the lower cavity 6, the condensate first enters the upper cavity 5, and then flows into the lower cavity 6 at the same flow rate as that entering the rectification column from the lower cavity 6, thereby isolating the influence of the condensate rate fluctuation on the condensate liquid level, stabilizing the reflux ratio, and improving the MTBE purification accuracy.

[0059] Specifically, as Figures 2-4 shown, the communication component includes: a connection cylinder 201 fixedly connected to the partition plate 4. The connection cylinder 201 is located in the lower cavity 6 and fits with the tank body 2. The connection cylinder 201 is communicated with the upper cavity 5. The connection cylinder 201 is provided with a number of communication ports 202 for communicating the connection cylinder 201 with the lower cavity 6. The connection cylinder 201 is provided with an adjustment component for changing the communication area between the upper cavity 5 and the lower cavity 6.

[0060] In the above solution, the connecting cylinder 201 is located at the middle position of the partition plate 4, facilitating the uniform dispersion of the condensate in the connecting cylinder 201 into the lower cavity 6. A number of communication ports 202 are circumferentially and equidistantly distributed in the middle and lower part of the side wall of the connecting cylinder 201, and the number of the communication ports 202 can be freely set. In this embodiment, under the normal working state, the liquid level height of the condensate in the lower cavity 6 is always higher than the height of the communication ports 202, but this is only limited to this embodiment. For specific descriptions, refer to the subsequent embodiments. By forming a communicating vessel with the connecting cylinder 201 and the lower cavity 6, the ripples formed by the falling of the condensate are isolated in the connecting cylinder 201, keeping the liquid level of the condensate in the lower cavity 6 stable and static, thereby further stabilizing the reflux ratio of the device to the distillation column and improving the MTBE purification accuracy.

[0061] Specifically, as Figures 3-5 shown, the adjusting assembly includes: a first sealing plate 203 fixedly connected to the connecting cylinder 201; a second sealing plate 204 rotatably connected to the connecting cylinder 201 and fitting with the first sealing plate 203. Both the first sealing plate 203 and the second sealing plate 204 are provided with a number of connecting holes in an annular array. The second sealing plate 204 is used to block the connecting holes on the first sealing plate 203. The connecting holes of the first sealing plate 203 and the connecting holes of the second sealing plate 204 are used to connect the connecting cylinder 201 with the upper cavity 5; a driving assembly arranged on the tank body 2 for driving the second sealing plate 204 to rotate along the connecting cylinder 201; the connecting cylinder 201 is provided with a number of constant pressure holes 205, and the constant pressure holes 205 are inclined. The height of one end of the constant pressure hole 205 close to the central axis of the connecting cylinder 201 is lower than that of the other end. The constant pressure holes 205 are located between the first sealing plate 203 and the communication ports 202.

[0062] In the above solution, both the first sealing plate 203 and the second sealing plate 204 are located in the upper part of the connecting cylinder 201, and the second sealing plate 204 is located above the first sealing plate 203. The number of through holes on the first sealing plate 203 and the second sealing plate 204 is the same and the distribution is the same. The constant pressure holes 205 are used to make the pressure in the connecting cylinder 201 consistent with the pressure in the lower cavity 6 and prevent the sputtering of the falling condensate in the connecting cylinder 201 to the outside.

[0063] Specifically, as Figure 1 、 Figure 3 and Figure 5 shown, the driving assembly includes: a first motor 301. A fixing frame is fixedly connected to the tank body 2, and the first motor 301 is fixedly connected to the fixing frame of the tank body 2; a connecting sleeve 302 fixedly connected to the second sealing plate 204, and the tank body 2 is in sealed rotational connection with the connecting sleeve 302; two transmission gears 303 are respectively fixedly connected to the output shaft of the first motor 301 and the connecting sleeve 302, and the two transmission gears 303 are meshed.

[0064] In the above scheme, the first motor 301 is located above the tank body 2. The first motor 301 is a servo motor. The first motor 301 controls the rotation of the second sealing plate 204 through two transmission gears 303, thereby controlling the flow area of ​​the connecting tube 201, and can intelligently control the flow rate of the condensate between the upper cavity 5 and the lower cavity 6.

[0065] In the process of purifying and distilling MTBE, the distillation tower vaporizes the light component mixture and transports it to the condenser from the top of the distillation tower. Then, the condensate condensed in the condenser enters the reflux tank through the liquid inlet pipe of the tank body 2. After a certain amount of condensate accumulates in the reflux tank, it is pumped to the distillation tower. Then, the cycle is repeated to complete the purification and distillation of MTBE, and the accumulated condensate in the reflux tank is regularly discharged.

[0066] The condensate first flows from the liquid inlet pipe of the tank body 2 into the upper cavity 5. At this time, the first motor 301 is turned on, so that the output shaft of the first motor 301 drives the connecting sleeve 302 to rotate through the two transmission gears 303, and the connecting sleeve 302 drives the second sealing plate 204 to rotate, so that the connecting hole on the second sealing plate 204 is connected with the connecting hole on the first sealing plate 203, and the first motor 301 is turned off. At this time, the condensate in the upper cavity 5 enters the lower cavity 6 along the connecting tube 201, and this is repeated until the condensate fills half of the lower cavity 6. The first motor 301 is controlled to make the second sealing plate 204 and the first sealing plate 203 block the connecting tube 201, thereby cutting off the connection between the upper cavity 5 and the lower cavity 6. When the condensate fills half of the upper cavity 5, the preparation work of the device is completed.

[0067] When the preparation work of the device is completed, reflux begins. At this time, the delivery pump 3 is turned on to deliver the condensate in the lower cavity 6 to the distillation tower. At the same time, the second sealing plate 204 is controlled by the first motor 301 to cancel the blockage of the connecting tube 201, and the unit time flow rate of the upper cavity 5 entering the lower cavity 6 through the connecting tube 201 is kept consistent with the unit time delivery flow rate of the delivery pump 3. This cycle is repeated until the distillation and purification of MTBE is completed. By dividing the tank body 2 into an upper cavity 5 and a lower cavity 6, the condensate first enters the upper cavity 5, and the flow of the upper cavity 5 into the lower cavity 6 is the same as the flow rate of the lower cavity 6 into the distillation tower, thereby isolating the liquid level fluctuation of the condensate caused by the fluctuation of the condensation rate of the condenser, stabilizing the reflux ratio of the device to the distillation tower, and improving the purification accuracy of MTBE.

[0068] When the condensate in the upper cavity 5 flows downward into the lower cavity 6, the condensate enters the connecting cylinder 201. At this time, since the liquid level of the condensate in the lower cavity 6 is higher than the height of the communication port 202, a communicating vessel is formed between the connecting cylinder 201 and the lower cavity 6. The ripples formed by the condensate entering the lower cavity 6 due to gravity are isolated within the connecting cylinder 201, keeping the liquid level of the condensate in the lower cavity 6 stable and static, thereby further stabilizing the reflux ratio of the device to the distillation column and improving the purification accuracy of MTBE.

[0069] During the distillation process, if the feed rate of the distillation column suddenly increases or decreases, it will cause corresponding changes in the liquid level entering the upper cavity 5. At this time, the liquid level sensor 7 located above will detect a large change in the liquid level of the condensate in the upper cavity 5. Here, taking the increase in the feed rate of the distillation column as an example, that is, the amount of light components entering the condenser increases. At this time, it is necessary to increase the conveying speed of the conveying pump 3, and at the same time control the position of the second sealing plate 204 through the first motor 301 to increase the flow rate of the connecting cylinder 201, that is, dynamically adjust the reflux ratio of the device to the distillation column. During this process, the liquid levels in both the upper cavity 5 and the lower cavity 6 will rise, and then the liquid level in the upper cavity 5 will return to the initial state. Due to the increase in the feed rate of the distillation column, at this time, the liquid level of the condensate in the lower cavity 6 rises, and the conveying speed of the conveying pump 3 also increases synchronously until it reaches a balance and reaches a new optimal reflux ratio. When the feed rate of the distillation column decreases, the operation method is opposite. When the situation occurs again, repeat the above steps.

[0070] When the MTBE distillation is completed, the connection between the conveying pump 3 and the distillation column is disconnected, and all the condensate in the upper cavity 5 and the lower cavity 6 is discharged by the conveying pump 3. Then, the second sealing plate 204 is controlled by the first motor 301 to block the connecting cylinder 201, cutting off the connection between the upper cavity 5 and the lower cavity 6, and restoring to the initial state. When preparing MTBE again, repeat the above steps.

[0071] In a further embodiment, as Figure 1 、 Figure 3 、 Figure 4 and Figure 6 shown, it further includes: a stirring assembly, arranged on the tank body 2, used to accelerate the liquid in the connecting cylinder 201 to enter the lower cavity 6. The stirring assembly includes: a second motor 401, fixedly connected to the fixing frame of the tank body 2; a transmission shaft 402, fixedly connected to the output shaft of the second motor 401, and the transmission shaft 402 is rotationally connected to the first sealing plate 203, the second sealing plate 204 and the connecting sleeve 302; a sliding sleeve 403, slidably connected to the transmission shaft 402, and a plurality of stirring plates 404 are arranged between the sliding sleeve 403 and the transmission shaft 402; a self-adjusting assembly, arranged on the connecting cylinder 201, used to make the communication aperture of the communication port 202 change synchronously with the liquid level of the lower cavity 6; the stirring plate 404 is a multi-stage telescopic plate, used to adapt to the change in the height of the sliding sleeve 403.

[0072] In the above solution, the second motor 401 is a servo motor. The output shaft of the second motor 401 is connected to the transmission shaft 402 through a coupling, and the rotation speed of the transmission shaft 402 can be freely set or intelligently regulated. The transmission shaft 402 is rotatably connected to the first sealing plate 203, the second sealing plate 204, and the connecting sleeve 302, forming multiple-point supports, which can reduce the radial runout of the transmission shaft 402 during rotation and improve the rotation stability of the transmission shaft 402. A number of stirring plates 404 are circumferentially and equally spaced between the sliding sleeve 403 and the transmission shaft 402. The stirring plate 404 can be a multi-stage telescopic plate, which is used to increase the liquid level change amount in the lower cavity 6.

[0073] Specifically, as Figure 3 and Figure 4 shown, the self-adjusting assembly includes: a float 501, which is slidably connected to the connecting cylinder 201; a flexible cloth 502, which is fixedly connected between the float 501 and the connecting cylinder 201; a connecting block 503, which is fixedly connected to the float 501 and is in a limited rotational connection with the sliding sleeve 403.

[0074] In the above solution, the inside of the float 501 is hollow and filled with foamed polyurethane material to ensure that the liquid level height can still be accurately reflected when the liquid density changes. The flexible cloth 502 is made of a composite of a fluororubber base material and a Kevlar fiber reinforcement layer. Its upper part is fixedly connected to the lower end surface of the connecting cylinder 201 through a vulcanization process, and its lower part is locked to the top of the float 501 by a clamp. While allowing the axial movement of the float 501, the flexible cloth 502 forms a dynamic sealing interface, effectively blocking the medium cross-flow between the upper cavity 5 and the lower cavity 6. When the condensate in the lower cavity 6 is at different heights, the communication port 202 always keeps the area of the region connecting the connecting cylinder 201 and the lower cavity 6 at the maximum value, ensuring that the condensate in the connecting cylinder 201 can flow into the lower cavity 6 in time and maintaining the liquid level stability of the lower cavity 6. The height of the communication port 202 in this embodiment is always higher than the liquid level of the condensate in the lower cavity 6, which is used to increase the liquid level change amount in the lower cavity 6.

[0075] When injecting condensate into the lower cavity 6, the liquid level of the condensate in the lower cavity 6 rises. When the liquid level contacts the float 501, it drives the float 501 to rise synchronously. At the same time, the float 501 drives the stretched flexible cloth 502 to gradually become loose. In this way, until the liquid level of the condensate in the lower cavity 6 reaches the set liquid level. When the condensate in the upper cavity 5 flows into the lower cavity 6, it needs to pass through the connecting cylinder 201. Since the connecting cylinder 201 and the lower cavity 6 form a communicating vessel due to the communication port 202, it takes a certain amount of time for the condensate in the connecting cylinder 201 to flow into the lower cavity 6, which may cause fluctuations in the liquid level height of the lower cavity 6. Therefore, when performing condensate reflux, the second motor 401 is started synchronously. The output shaft of the second motor 401 drives the transmission shaft 402 to rotate. The transmission shaft 402 drives a plurality of stirring plates 404 thereon to rotate synchronously through the sliding sleeve 403, so that the plurality of stirring plates 404 push the condensate in the connecting cylinder 201 to be quickly discharged along the communication port 202, reducing the time for the condensate in the connecting cylinder 201 to enter the lower cavity 6 and improving the stability of the liquid level of the condensate in the lower cavity 6.

[0076] When the liquid level in the lower cavity 6 changes, the float 501 will change synchronously with the liquid level of the condensate in the lower cavity 6. The float 501 slides along the connecting cylinder 201, so that the float 501 drives the flexible cloth 502 to move synchronously. When the float 501 moves upward, the flexible cloth 502 gradually loosens. When the float 501 moves downward, the flexible cloth 502 gradually stretches. The area of the communication port 202 above the liquid level is blocked by the flexible cloth 502, so that the unblocked area of the communication port 202 is always located below the liquid level of the lower cavity 6. Thus, when the condensate in the lower cavity 6 is at different heights, the aperture of the communication port 202 connecting the connecting cylinder 201 and the lower cavity 6 is always at the relative maximum value, ensuring that the condensate in the connecting cylinder 201 can flow into the lower cavity 6 in time and maintaining the stability of the liquid level of the lower cavity 6.

[0077] When the float 501 slides along the connecting cylinder 201, the float 501 drives the connecting block 503 thereon to move synchronously, so that the connecting block 503 drives the sliding sleeve 403 to slide along the transmission shaft 402. The sliding sleeve 403 drives the top of the stirring plate 404 to move synchronously, changing the height of the stirring plate 404, so that the stirring plate 404 changes synchronously with the liquid level of the condensate in the lower cavity 6, and the top of the stirring plate 404 is always located below the liquid level of the condensate in the lower cavity 6, avoiding the height of the stirring plate 404 being fixed, resulting in the rotation of the stirring plate 404 interfering with the flow of the condensate in the upper cavity 5 into the lower cavity 6 when the liquid level of the condensate in the lower cavity 6 drops.

[0078] After the preparation of MTBE is completed, as the condensate in the lower cavity 6 is gradually discharged, the float 501 moves downward along the connecting cylinder 201 and drives the flexible cloth 502 to move synchronously, making it in a straightened state. Subsequently, both the float 501 and the flexible cloth 502 stop moving, and then the second motor 401 is turned off. When MTBE needs to be prepared again, the above steps are repeated.

[0079] In this embodiment, the stirring plate 404 is fixedly connected to the sliding sleeve 403 and the transmission shaft 402, but this is only limited to this embodiment. In subsequent other embodiments, the stirring plate 404 is rotatably connected to the sliding sleeve 403 and the transmission shaft 402. For specific descriptions, refer to the specific descriptions in the subsequent embodiments.

[0080] In a further embodiment, as Figure 8 and 9 shown, it further includes: a deflection assembly arranged inside the transmission shaft 402 for driving the stirring plate 404 to deflect. The deflection assembly includes: a sliding member 601 slidably connected to the transmission shaft 402. A cable 602 is fixedly connected between the stirring plate 404 and the sliding member 601. The stirring plate 404 is rotatably connected to both the sliding sleeve 403 and the transmission shaft 402, and an elastic element 603 is arranged between the stirring plate 404 and the transmission shaft 402; a pushing assembly arranged on the fixing frame of the tank body 2 for driving the sliding member 601 to move along the transmission shaft 402.

[0081] In the above solution, a guiding channel extending axially is arranged inside the transmission shaft 402. The sliding member 601 can slide in the guiding channel of the transmission shaft 402. The cable 602 is partially wound around the stirring plate 404, and the winding directions of all the stirring plates 404 are the same. The sliding member 601 can pull the stirring plate 404 to deflect through the cable 602. The elastic element 603 is a torsion spring for driving the stirring plate 404 to reset, and the torsion force of the elastic element 603 is sufficient to overcome the rotational force of the stirring plate 404 to prevent unnecessary torsion of the stirring plate 404.

[0082] Specifically, as Figure 7 and Figure 8 shown, the pushing assembly includes: a driving gear 604 rotatably connected to the fixing frame of the tank body 2. The driving gear 604 is engaged with any one of the transmission gears 303; a rotating shell 605 fixedly connected to the driving gear 604. An inclined sliding groove 606 is arranged on the rotating shell 605; a spline shaft 607 fixedly connected to the fixing frame of the tank body 2. The spline shaft 607 is spline-connected with a block 608. The block 608 slides in the inclined sliding groove 606, and the block 608 is in limit sliding connection with the sliding member 601.

[0083] In the above solution, the inclined chute 606 is arranged outside the rotating shell 605 in a spiral manner, and the spiral pitch angle of the inclined chute 606 is set to 15° to 25°, which ensures the transmission efficiency while avoiding the occurrence of self-locking. When the flow aperture of the connecting cylinder 201 changes, the stirring plate 404 is synchronously deflected, reducing the pushing area of the stirring plate 404 on the condensate, reducing the load of the second motor 401 and the acting force between the stirring plate 404 and the condensate, and extending the service life of both.

[0084] When the first motor 301 controls the second sealing plate 204 to change the flow aperture of the connecting cylinder 201 (herein described with an increase), the corresponding flow rate per unit time increases synchronously, and the rotational speed of the output shaft of the second motor 401 increases synchronously, thereby accelerating the discharge speed of the condensate in the connecting cylinder 201. At the same time, the output shaft of the first motor 301 drives the driving gear 604 to rotate through two transmission gears 303, causing the driving gear 604 to drive the rotating shell 605 thereon to rotate synchronously. The rotating shell 605 drives the inclined chute 606 thereon to rotate, causing the inclined chute 606 to push the block 608 to slide upward along the spline shaft 607. The block 608 drives the sliding member 601 to move upward synchronously along the transmission shaft 402. At this time, the sliding member 601 pulls the two cables 602 to move synchronously, and the cables 602 pull the adjacent stirring plates 404 to deflect. At the same time, the elastic element 603 is twisted. By deflecting the stirring plate 404, the pushing area of the stirring plate 404 on the condensate is reduced, the load of the second motor 401 and the acting force of the stirring plate 404 are reduced, and the service life of both is extended.

[0085] When the preparation of MTBE is completed, the output shaft of the first motor 301 rotates and resets to the initial state. At this time, the driving gear 604 rotates and resets synchronously, causing the rotating shell 605 to drive the block 608 to reset through the inclined chute 606 thereon. Furthermore, the sliding member 601 slides and resets along the transmission shaft 402. At the same time, the elastic element 603 resets and drives the adjacent stirring plates 404 to rotate and reset to the initial state. When MTBE needs to be prepared again, the above steps are repeated.

[0086] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A reflux tank for an MTBE device, characterized by comprising: a bracket (1); a tank body (2), fixedly connected to the bracket (1), and a delivery pump (3) is installed on the bracket (1); a partition plate (4), fixedly connected inside the tank body (2) and dividing the tank body (2) into an upper cavity (5) and a lower cavity (6). The tank body (2) is fixedly connected with a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe of the tank body (2) is communicated with the upper cavity (5), the lower cavity (6) is communicated with the liquid outlet pipe of the tank body (2), and the delivery pump (3) is communicated with the liquid outlet pipe of the tank body (2); two liquid level sensors (7), respectively fixedly connected to the tank body (2) and the partition plate (4). The liquid level sensor (7) on the tank body (2) is located in the upper cavity (5), and the liquid level sensor (7) on the partition plate (4) is located in the lower cavity (6); a communication component, arranged on the partition plate (4) for communicating the upper cavity (5) and the lower cavity (6); The communication component includes: a connecting cylinder (201), fixedly connected to the partition plate (4). The connecting cylinder (201) is located in the lower cavity (6) and is attached to the tank body (2). The connecting cylinder (201) is communicated with the upper cavity (5). The connecting cylinder (201) is provided with a plurality of communication ports (202) for communicating the connecting cylinder (201) with the lower cavity (6). The connecting cylinder (201) is provided with an adjusting component for changing the communication area between the upper cavity (5) and the lower cavity (6).

2. A reflux drum for an MTBE unit according to claim 1, characterized in that, The adjusting component includes: a first sealing plate (203), fixedly connected to the connecting cylinder (201); a second sealing plate (204), rotatably connected to the connecting cylinder (201) and attached to the first sealing plate (203). Both the first sealing plate (203) and the second sealing plate (204) are provided with a plurality of connecting holes in an annular array. The second sealing plate (204) is used to block the connecting holes on the first sealing plate (203). The connecting holes of the first sealing plate (203) and the connecting holes of the second sealing plate (204) are used to communicate the connecting cylinder (201) with the upper cavity (5); a driving component, arranged on the tank body (2) for driving the second sealing plate (204) to rotate along the connecting cylinder (201).

3. A reflux drum for an MTBE unit according to claim 2, characterized in that, The connecting cylinder (201) is provided with a plurality of constant pressure holes (205), and the constant pressure holes (205) are inclined. One end of the constant pressure hole (205) close to the central axis of the connecting cylinder (201) is lower than the other end. The constant pressure holes (205) are located between the first sealing plate (203) and the communication ports (202).

4. A reflux drum for an MTBE unit according to claim 2, characterized in that, The driving component includes: a first motor (301), the tank body (2) is fixedly connected with a fixing frame, and the first motor (301) is fixedly connected to the fixing frame of the tank body (2); The connecting sleeve (302) is fixedly connected to the second sealing plate (204), and the tank body (2) is in sealed rotational connection with the connecting sleeve (302); There are two transmission gears (303), which are respectively fixedly connected to the output shaft of the first motor (301) and the connecting sleeve (302), and the two transmission gears (303) are meshed with each other.

5. A reflux drum for an MTBE unit according to claim 4, characterized in that, It further includes: A stirring assembly is arranged on the tank body (2) and is used to accelerate the liquid in the connecting cylinder (201) to enter the lower cavity (6). The stirring assembly includes: A second motor (401) is fixedly connected to the fixing frame of the tank body (2); A transmission shaft (402) is fixedly connected to the output shaft of the second motor (401), and the transmission shaft (402) is in rotational connection with the first sealing plate (203), the second sealing plate (204) and the connecting sleeve (302); A sliding sleeve (403) is slidably connected to the transmission shaft (402), and a plurality of stirring plates (404) are arranged between the sliding sleeve (403) and the transmission shaft (402); An automatic adjustment assembly is arranged on the connecting cylinder (201) and is used to make the communication aperture of the communication port (202) change synchronously with the liquid level of the lower cavity (6).

6. A reflux drum for an MTBE unit according to claim 5, characterized in that, The stirring plate (404) is a multi-stage telescopic plate and is used to adapt to the change in the height of the sliding sleeve (403).

7. A reflux drum for an MTBE unit according to claim 5, characterized in that, The automatic adjustment assembly includes: A float (501) is slidably connected to the connecting cylinder (201); A flexible cloth (502) is fixedly connected between the float (501) and the connecting cylinder (201); A connecting block (503) is fixedly connected to the float (501) and is in limit rotational connection with the sliding sleeve (403).

8. A reflux drum for an MTBE unit according to claim 5, characterized in that, It further includes: A deflection assembly is arranged in the transmission shaft (402) and is used to drive the stirring plate (404) to deflect. The deflection assembly includes: A sliding member (601) is slidably connected to the transmission shaft (402). A cable (602) is fixedly connected between the stirring plate (404) and the sliding member (601). The stirring plate (404) is in rotational connection with both the sliding sleeve (403) and the transmission shaft (402), and an elastic element (603) is arranged between the stirring plate (404) and the transmission shaft (402); A pushing assembly is arranged on the fixing frame of the tank body (2) and is used to drive the sliding member (601) to move along the transmission shaft (402).

9. A reflux drum for an MTBE unit according to claim 8, characterized in that, The pushing assembly includes: A driving gear (604) is rotatably connected to the fixing frame of the tank body (2), and the driving gear (604) is meshed with any one of the transmission gears (303); A rotating shell (605) is fixedly connected to the driving gear (604), and an inclined sliding groove (606) is arranged on the rotating shell (605); A spline shaft (607) is fixedly connected to a fixing bracket of the tank body (2). The spline shaft (607) is spline-connected with a clamping block (608). The clamping block (608) slides in the inclined sliding groove (606), and the clamping block (608) is in limiting sliding connection with the sliding member (601).

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