Reboiler and rectification column

Abstract

The embodiment of the present application provides a reboiler and a rectifying tower, the reboiler comprises a body, a heating device and a differential pressure liquid level meter. The body is provided with an evaporation cavity, a pressure measurement cavity and a transfer cavity, the evaporation cavity and the pressure measurement cavity are both below the transfer cavity, the top of the evaporation cavity and the top of the pressure measurement cavity are both communicated with the transfer cavity, the transfer cavity is provided with a liquid inlet, the liquid inlet is used for the condensed liquid in the rectifying tower to enter the transfer cavity, the bottom of the evaporation cavity and the bottom of the pressure measurement cavity are communicated. The differential pressure liquid level meter is used for obtaining the liquid pressure value of the bottom wall of the pressure measurement cavity and the gas pressure value in the transfer cavity. The heating device is used for heating the condensed liquid in the evaporation cavity and making it gasify. The reboiler in the embodiment of the present application can indirectly obtain the liquid level height in the evaporation cavity by measuring the liquid level height in the pressure measurement cavity, thereby effectively reducing the probability that the liquid level height detection is seriously distorted due to the influence of the gasification material on the condensed liquid density, and improving the measurement precision of the liquid level height in the reboiler.

Description

Technical Field

[0001] The present invention relates to the field of distillation technology, specifically to a reboiler and a distillation column. Background Technology

[0002] A distillation column is a tower-type gas-liquid contact device used for distillation. A distillation column is equipped with a reboiler. The liquid refluxed from the distillation column flows into the reboiler, where a portion of the liquid is heated and vaporized before returning to the distillation column for further distillation. The remaining portion of the liquid vaporizes and is discharged from the distillation column's outlet.

[0003] The reboiler is equipped with a differential pressure sensor. The differential pressure sensor calculates the liquid level in the reboiler by acquiring the pressure difference at different locations within the reboiler, which allows for production control based on the liquid level and improves operational safety.

[0004] The gas produced by heating and vaporization mixes with the liquid, causing a change in the liquid's density and consequently a change in its pressure. This results in a significant discrepancy between the liquid level height calculated by the differential pressure sensor based on the pressure value and the actual liquid level height, making it impossible to obtain a sufficiently accurate liquid level height value. Summary of the Invention

[0005] In view of this, embodiments of the present invention aim to provide a reboiler and distillation column that can improve the accuracy of liquid level measurement.

[0006] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0007] This invention provides a reboiler for a distillation column, the reboiler comprising:

[0008] The main body includes an evaporation chamber, a pressure measuring chamber, and a transfer chamber. The evaporation chamber and the pressure measuring chamber are both located below the transfer chamber, and their tops are connected to the transfer chamber. The transfer chamber is provided with a liquid inlet for the condensate in the distillation column to enter the transfer chamber. The bottom of the evaporation chamber is connected to the bottom of the pressure measuring chamber.

[0009] A differential pressure level gauge is used to obtain the liquid pressure value at the bottom wall of the pressure measuring chamber and the gas pressure value in the transfer chamber;

[0010] A heating device is used to heat the condensate in the evaporation chamber and vaporize it.

[0011] In some embodiments, the bottom wall of the transfer cavity is provided with a first connecting hole, which extends vertically to connect the transfer cavity and the pressure measuring cavity;

[0012] And / or, the bottom wall of the transfer chamber is provided with a second connecting hole, which extends vertically to connect the transfer chamber and the evaporation chamber.

[0013] In some embodiments, the inlet is located on the top wall of the transfer chamber, and at least a portion of the projection of the inlet is located within the projection range of the communication position between the pressure measuring chamber and the transfer chamber on a horizontal projection plane.

[0014] Alternatively, the projection of the connection point between the pressure measuring chamber and the transfer chamber may be outside the projection range of the liquid inlet.

[0015] In some embodiments, the evaporation chamber is arranged around the pressure measuring chamber on the outer side in the horizontal direction.

[0016] In some embodiments, the inlet is located on the top wall of the transfer cavity, the transfer cavity is conical, and the area of ​​the cross-section of the transfer cavity in the horizontal direction gradually increases downward in the vertical direction.

[0017] In some embodiments, the transfer chamber is provided with a discharge port, which is located on the inner wall of one side of the transfer chamber along the horizontal direction. The discharge port is used to discharge the gas generated by vaporization in the evaporation chamber from the main body.

[0018] In some embodiments, the low-pressure detection area of ​​the differential pressure level gauge is located on the inner wall of one side of the transfer chamber along the horizontal direction.

[0019] In some embodiments, the body further includes a transition cavity that connects the evaporation cavity and the pressure measuring cavity, so that the liquid in the pressure measuring cavity and the liquid in the evaporation cavity can be exchanged through the transition cavity.

[0020] In some embodiments, the bottom of the transition cavity is connected to the bottom of the pressure measuring cavity and the bottom of the evaporation cavity, respectively.

[0021] In some embodiments, the transition cavity and the pressure measuring cavity are connected through a first channel, and the transition cavity and the evaporation cavity are connected through a second channel, both the first channel and the second channel extending in a horizontal direction;

[0022] The first channel and the second channel are arranged in a staggered manner along the vertical direction;

[0023] And / or, the transition cavity is located on the outer side of the pressure measuring cavity along the horizontal direction, the evaporation cavity is located on the outer side of the transition cavity along the horizontal direction, and the first channel and the second channel are staggered circumferentially.

[0024] In some embodiments, the body includes an outer shell, a cover, and a column. The outer shell has a first cavity extending vertically, with its top side open. The cover is positioned over the open portion of the first cavity. The cover has a second cavity extending vertically through it, communicating with the first cavity. The column extends vertically and is located within the first cavity. The bottom end of the column is connected to the bottom wall of the first cavity. The inner space of the column forms the pressure measuring chamber. The outer wall of the column in the horizontal direction and the inner wall of the first cavity in the horizontal direction are at least partially spaced to form the evaporation chamber. The column and the inner wall of the second cavity are spaced apart, and at least a portion of the second cavity forms the transfer chamber.

[0025] In some embodiments, a third cavity is provided in the wall of the tube column, and the bottom of the third cavity is connected to the pressure measuring cavity and the evaporation cavity.

[0026] This invention also provides a distillation column, which includes any of the reboilers described in the foregoing embodiments.

[0027] The reboiler in this embodiment of the invention, by setting up an evaporation chamber and a pressure measuring chamber that are interconnected, allows the liquid level in the evaporation chamber to be indirectly obtained by measuring the liquid level in the pressure measuring chamber. This effectively reduces the probability of severe distortion in liquid level detection caused by the influence of vaporized substances on the density of the condensate, improves the measurement accuracy of the liquid level in the reboiler, facilitates real-time monitoring of the condensate volume in the reboiler during production, reduces the probability of dry burning of the heating device, and provides an effective reference for controlling production speed and product quality. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the reboiler along the vertical direction in one embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the reboiler along the vertical direction in another embodiment of the present invention;

[0030] Figure 3 for Figure 2 A cross-sectional view of the Chinese embodiment along the horizontal direction.

[0031] Explanation of reference numerals in the attached figures

[0032] 10. Body; 10a. Evaporation chamber; 10b. Pressure measuring chamber; 10c. Transfer chamber; 10d. Liquid inlet; 10e. First connecting hole; 10f. Second connecting hole; 10g. Discharge port; 10h. Third connecting hole; 10i. Transition chamber; 10j. First channel; 10k. Second channel; 11. Outer shell; 11a. First cavity; 12. Cover; 12a. Second cavity; 13. Tube column; 13a. Third cavity; 20. Differential pressure level gauge; 20a. Low pressure detection area; 20b. High pressure detection area; 30. Heating device. Detailed Implementation

[0033] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other. The detailed description in the specific embodiments should be understood as an explanation of the purpose of the embodiments of the present invention and should not be regarded as an improper limitation on the embodiments of the present invention.

[0034] In the description of the embodiments of this invention, the orientation or positional relationship of "vertical direction", "down", "bottom", "top", and "horizontal direction" is based on the appendix. Figure 1 and attached Figure 2 The orientations or positional relationships shown are for the convenience of describing this application and simplifying the description, and are not intended to 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 limiting the embodiments of the present invention.

[0035] This invention provides a reboiler for a distillation column. The condensate produced by the distillation column enters the reboiler for reheating, boiling, and vaporization, allowing the gaseous product to exit the distillation column. (See also...) Figure 1 and Figure 2 The reboiler includes a body 10, a heating device 30, and a differential pressure level gauge 20.

[0036] The main body 10 is provided with an evaporation chamber 10a, a pressure measuring chamber 10b and a transfer chamber 10c. The evaporation chamber 10a and the pressure measuring chamber 10b are both located below the transfer chamber 10c, and the tops of both are connected to the transfer chamber 10c. The transfer chamber 10c is provided with a liquid inlet 10d, which is used for the condensate in the distillation column to enter the transfer chamber 10c. The bottom of the evaporation chamber 10a is connected to the bottom of the pressure measuring chamber 10b.

[0037] The differential pressure level gauge 20 is used to obtain the liquid pressure value of the bottom wall of the pressure measuring chamber 10b and the gas pressure value in the transfer chamber 10c.

[0038] The heating device 30 is used to heat the condensate in the evaporation chamber 10a and vaporize it.

[0039] The top of the pressure measuring chamber 10b is connected to the transfer chamber 10c. This means that a channel is provided on the top wall of the pressure measuring chamber 10b along the vertical direction to connect with the transfer chamber 10c, or a channel is provided at the top of the side wall of the pressure measuring chamber 10b along the horizontal direction to connect with the transfer chamber 10c.

[0040] Thus, the condensate entering the transfer chamber 10c can enter the pressure measuring chamber 10b, while the condensate in the pressure measuring chamber 10b, under the action of gravity, accumulates at the end that is vertically away from the position where the pressure measuring chamber 10b and the transfer chamber 10c are connected, making it difficult for it to enter the transfer chamber 10c.

[0041] The condensate in the evaporation chamber 10a is heated by the heating device 30 until it is higher than the boiling point of the condensate, causing the condensate to vaporize into a gaseous substance, which then rises to the top of the evaporation chamber 10a.

[0042] The top of the evaporation chamber 10a is connected to the transfer chamber 10c. This means that the top wall of the evaporation chamber 10a along the vertical direction is provided with a channel that connects to the transfer chamber 10c, or that the top of the side wall of the evaporation chamber 10a along the horizontal direction is provided with a channel that connects to the transfer chamber 10c.

[0043] In this way, the gaseous substances in the evaporation chamber 10a can enter the transfer chamber 10c through the connection between the evaporation chamber 10a and the transfer chamber 10c, and then be discharged from the reboiler through the transfer chamber 10c or returned to the distillation column of the distillation column for re-distillation through other channels such as the liquid inlet 10d.

[0044] The vertical direction refers to the straight line in which the direction of gravity lies.

[0045] The bottom of the evaporation chamber 10a is connected to the bottom of the pressure measuring chamber 10b. On the one hand, the condensate can flow freely between the evaporation chamber 10a and the pressure measuring chamber 10b under the action of gravity. On the other hand, even when there is little condensate in both the pressure measuring chamber 10b and the evaporation chamber 10a, the condensate can still flow between them, which helps to make the liquid surface of the condensate in the pressure measuring chamber 10b flush with the liquid surface in the evaporation chamber 10a.

[0046] Understandably, as the condensate in the evaporation chamber 10a evaporates and decreases, the condensate in the pressure measuring chamber 10b can continuously flow into the evaporation chamber 10a to replenish it, thereby reducing the probability of dry burning in the evaporation chamber 10a.

[0047] Thus, the condensate enters the transfer chamber 10c through the inlet 10d and can at least enter the pressure measuring chamber 10b. The condensate in the pressure measuring chamber 10b then enters the evaporation chamber 10a. The condensate in the evaporation chamber 10a evaporates under the heating action of the heating device 30 to form a gaseous substance. The gaseous substance rises and enters the transfer chamber 10c, and is discharged through the transfer chamber 10c or returned to the distillation column of the distillation tower.

[0048] The differential pressure level gauge 20 measures the pressure difference between the gas and liquid phases by testing the gas and liquid phase pressure values ​​at different locations to obtain the liquid level height.

[0049] It should be noted that the pressure at any depth in a liquid is related to the density of the liquid and the depth.

[0050] The density of the condensate in the steam chamber differs significantly from its actual density due to the influence of gaseous substances produced by vaporization within the steam chamber. However, the condensate in the pressure measuring chamber 10b, not being directly heated by the heating device 30, is less affected by these gaseous substances. Therefore, the density of the condensate in the pressure measuring chamber 10b more accurately reflects its actual density.

[0051] The liquid level in pressure measuring chamber 10b can be calculated by measuring the liquid pressure at the bottom of pressure measuring chamber 10b and the gas pressure in transfer chamber 10c, combined with the actual density of the condensate. The liquid level in evaporation chamber 10a can be determined by the vertical dimensional difference between pressure measuring chamber 10b and evaporation chamber 10a.

[0052] The reboiler in this embodiment of the invention, by setting up an evaporation chamber 10a and a pressure measuring chamber 10b that are interconnected, allows the liquid level in the evaporation chamber 10a to be indirectly obtained by measuring the liquid level in the pressure measuring chamber 10b. This effectively reduces the probability of severe distortion in liquid level detection caused by the influence of vaporized substances on the density of the condensate, improves the measurement accuracy of the liquid level in the reboiler, facilitates real-time monitoring of the condensate volume in the reboiler during production, reduces the probability of dry burning of the heating device 30, and provides an effective reference for controlling production speed and product quality.

[0053] It should be noted that the specific details and related structures of the differential pressure level gauge 20 for measuring differential pressure have been disclosed in relevant technologies and will not be elaborated here.

[0054] The specific number of liquid inlets 10d is not limited; it can be one or more.

[0055] In some embodiments, the evaporation chamber 10a and the pressure measuring chamber 10b have the same vertical dimensions and are located at the same height.

[0056] Understandably, it is necessary to ensure that the condensate in the transfer chamber 10c flows into the evaporation chamber 10a and the pressure measuring chamber 10b as quickly and as much as possible.

[0057] For example, see Figure 1 and Figure 2 The bottom wall of the transfer cavity 10c is provided with a first connecting hole 10e, which extends vertically to connect the transfer cavity 10c and the pressure measuring cavity 10b.

[0058] In other words, the first connecting hole 10e connects the bottom wall of the transfer cavity 10c and the top wall of the pressure measuring cavity 10b.

[0059] In this way, on the one hand, the condensate in the transfer chamber 10c can directly pass through the first connecting hole 10e into the pressure measuring chamber 10b under the action of gravity, thereby reducing the residue of condensate in the transfer chamber 10c; on the other hand, it also reduces the probability of condensate in the pressure measuring chamber 10b re-entering the transfer chamber 10c.

[0060] The specific number of the first connecting holes 10e is not limited; it can be one or more.

[0061] For example, see Figure 1 and Figure 2 The bottom wall of the transfer chamber 10c is provided with a second connecting hole 10f, which extends vertically to connect the transfer chamber 10c and the evaporation chamber 10a.

[0062] In other words, the second connecting hole 10f connects the bottom wall of the transfer cavity 10c and the top wall of the evaporation cavity 10a.

[0063] In this way, on the one hand, the condensate in the transfer chamber 10c can directly pass through the second connecting hole 10f into the steam chamber under the action of gravity, thereby reducing the residue of condensate in the transfer chamber 10c; on the other hand, the gaseous substances formed by the vaporization of the condensate after heating and evaporation can rise and directly enter the transfer chamber 10c, which is conducive to improving the evaporation efficiency in the evaporation chamber 10a.

[0064] The specific number of the second connecting holes 10f is not limited; it can be one or more.

[0065] In some embodiments, the inlet 10d is located at the top of the transfer chamber 10c. This facilitates the condensate entering the transfer chamber 10c under gravity, making it difficult for it to flow back into the distillation column of the distillation tower. On the other hand, it also facilitates the entry of some of the gaseous substances generated in the evaporation chamber 10a into the distillation column through the inlet 10d.

[0066] The top of the transfer chamber 10c refers to the top wall of the transfer chamber 10c along the vertical direction, or the top of the side wall of the evaporation chamber 10a along the horizontal direction.

[0067] Understandably, if the condensate in transfer chamber 10c enters evaporation chamber 10a, it will lower the temperature inside evaporation chamber 10a, thereby reducing the evaporation efficiency in evaporation chamber 10a, and may even cause the gaseous substance formed by vaporization to revert to a liquid state. Therefore, it is necessary to prevent the condensate in transfer chamber 10c from entering evaporation chamber 10a, and to allow as much condensate as possible to enter pressure measuring chamber 10b.

[0068] In some embodiments, see Figure 1 and Figure 2 The inlet 10d is located on the top wall of the transfer chamber 10c. On the projection plane along the horizontal direction, at least a portion of the projection of the inlet 10d is located within the projection range of the communication position between the pressure measuring chamber 10b and the transfer chamber 10c.

[0069] The horizontal projection surface refers to the projection surface that is perpendicular to the vertical direction.

[0070] The condensate passes through the inlet 10d and enters the transfer chamber 10c directly under the action of gravity. At least a portion of the condensate entering the transfer chamber 10c can pass directly downward through the transfer chamber 10c and enter the pressure measuring chamber 10b through the connection between the pressure measuring chamber 10b and the transfer chamber 10c.

[0071] Thus, on the one hand, the efficiency of condensate entering the pressure measuring chamber 10b is improved, which helps to reduce the residue of condensate in the transfer chamber 10c; on the other hand, more condensate can directly enter the pressure measuring chamber 10b, which helps to reduce the amount of condensate flowing from the transfer chamber 10c into the evaporation chamber 10a, thereby reducing the adverse effect of condensate on the evaporation efficiency in the evaporation chamber 10a.

[0072] In some embodiments, see Figure 1 and Figure 2 The inlet 10d is located on the top wall of the transfer chamber 10c. On the horizontal projection plane, the projection of the connection position between the pressure measuring chamber 10b and the transfer chamber 10c is outside the projection range of the inlet 10d.

[0073] In this way, the condensate entering the transfer chamber 10c cannot directly pass through the connection between the evaporation chamber 10a and the transfer chamber 10c to enter the evaporation chamber 10a, which helps to suppress the amount of condensate entering the evaporation chamber 10a and helps to ensure that the evaporation efficiency in the evaporation chamber 10a meets the production requirements.

[0074] In some embodiments, see Figure 1 and Figure 2On the horizontal projection plane, the projection of the inlet 10d lies entirely within the projection range of the connection point between the pressure measuring chamber 10b and the transfer chamber 10c. This allows the condensate to fall directly into the pressure measuring chamber 10b after entering through the inlet 10d, thereby further reducing the amount of condensate flowing into the evaporation chamber 10a from the transfer chamber 10c.

[0075] The relative positions of the evaporation chamber 10a and the pressure measuring chamber 10b are not limited.

[0076] For example, see Figure 3 The evaporation chamber 10a is arranged in a ring around the pressure measuring chamber 10b along the horizontal direction. In this way, with a fixed volume of the evaporation chamber 10a and the pressure measuring chamber 10b, it is beneficial to reduce the overall outer contour size of the body 10, making the reboiler structure compact and improving the ease of installation of the reboiler.

[0077] The specific shape and form of the transfer cavity 10c are not limited.

[0078] For example, see Figure 1 and Figure 2 The inlet 10d is located on the top wall of the transfer chamber 10c. The transfer chamber 10c is cone-shaped, and the area of ​​the cross-section of the transfer chamber 10c in the horizontal direction gradually increases downward in the vertical direction.

[0079] In this way, the gaseous substances produced by the vaporization of the evaporation chamber 10a enter the transfer chamber 10c and, guided by the horizontal sidewall of the transfer chamber 10c, can flow towards the liquid inlet 10d. Thus, they can flow back to other parts of the distillation column, such as the rectification column, through the liquid inlet 10d, reducing the residence time of the gaseous substances in the transfer chamber 10c and thereby improving the evaporation efficiency in the evaporation chamber 10a.

[0080] The cone-shaped transfer cavity 10c can be a pyramid or a cone.

[0081] In some embodiments, the transfer cavity 10c is a perfect cone shape, which helps to ensure that the gas pressure on the inner wall of the transfer cavity 10c is uniform, reducing the probability of damage and leakage due to stress concentration.

[0082] It is understandable that the gaseous substance vaporized in the evaporation chamber 10a is the final product required by the distillation column.

[0083] In some embodiments, see Figure 1 and Figure 2 The transfer chamber 10c is provided with a discharge port 10g, which is used to discharge the gas generated by vaporization in the evaporation chamber 10a out of the main body 10.

[0084] In other words, part of the gaseous substance produced by evaporation in evaporation chamber 10a can flow back to other parts of the distillation column, such as the distillation column, through liquid inlet 10d, while the other part can be discharged through outlet 10g to obtain distilled products.

[0085] Understandably, the 10g outlet is equipped with a flow control valve to control the flow rate of the desired distilled product.

[0086] In some embodiments where a discharge port 10g is provided, the transfer chamber 10c is conical, and the liquid inlet 10d is located on the top wall of the transfer chamber 10c, see [reference]. Figure 1 and Figure 2 The discharge port 10g is located on the inner wall of the transfer chamber 10c along the horizontal direction.

[0087] In this way, on the one hand, the probability of condensate flowing in from the inlet 10d entering the outlet 10g and being directly discharged due to splashing or other reasons is reduced, making it easier to control the flow rate of the discharged gaseous substances from the outlet 10g; on the other hand, during the process of the gaseous substances rising under the guidance of the horizontal sidewall of the transfer chamber 10c, some of the gaseous substances can directly enter the outlet 10g, improving the discharge efficiency.

[0088] The specific number of 10g discharge ports is not limited; it can be one or more.

[0089] The differential pressure level gauge 20 has a low-pressure detection area 20a and a high-pressure detection area. The high-pressure detection area is located on the bottom wall of the pressure measuring chamber 10b to obtain the liquid pressure value of the bottom wall of the pressure measuring chamber 10b. The low-pressure detection area 20a is located in the transfer chamber 10c to obtain the gas pressure value in the transfer chamber 10c.

[0090] In some embodiments where the transfer chamber 10c is conical and the inlet 10d is located on the top wall of the transfer chamber 10c, see [reference]. Figure 1 and Figure 2 The low-pressure detection area 20a of the differential pressure level gauge 20 is located on the inner wall of one side of the transfer chamber 10c along the horizontal direction.

[0091] In this way, the low-pressure detection area 20a can detect the gas pressure in the transfer chamber 10c, while reducing the adverse effects of the condensate in the transfer chamber 10c on the low-pressure detection area 20a, which is beneficial to improving the detection accuracy of the differential pressure level gauge 20.

[0092] The specific method for connecting the evaporation chamber 10a and the pressure measuring chamber 10b is not limited; they can be directly connected or indirectly connected through other structures. For example, see [reference needed]. Figure 1The main body 10 also has a third connecting hole 10h, which extends horizontally. One end of the third connecting hole 10h opens onto one side wall of the evaporation chamber 10a along the horizontal direction, and the other end opens onto one side wall of the pressure measuring chamber 10b along the horizontal direction. In this way, direct communication is achieved between the evaporation chamber 10a and the pressure measuring chamber 10b, facilitating the flow of condensate in the third connecting hole 10h and reducing obstruction.

[0093] It is understandable that the heating device 30 heats the condensate in the evaporation chamber 10a. The heated condensate can exchange heat with the condensate in the pressure measuring chamber 10b through the connection between the evaporation chamber 10a and the pressure measuring chamber 10b. The condensate in the pressure measuring chamber 10b absorbs heat, causing its temperature to rise. This could lead to evaporation and vaporization, resulting in a change in the density of the condensate in the pressure measuring chamber 10b, which could then cause measurement distortion in the high-pressure detection area on the bottom wall of the pressure measuring chamber 10b. Therefore, an auxiliary structure can be provided to indirectly connect the evaporation chamber 10a and the pressure measuring chamber 10b to reduce heat transfer from the condensate in the evaporation chamber 10a to the condensate in the pressure measuring chamber 10b.

[0094] Specifically, see Figure 2 and Figure 3 The main body 10 also includes a transition cavity 10i, which connects the evaporation cavity 10a and the pressure measuring cavity 10b, so that the liquid in the pressure measuring cavity 10b and the liquid in the evaporation cavity 10a can be exchanged through the transition cavity 10i.

[0095] In other words, the condensate in the pressure measuring chamber 10b first enters the transition chamber 10i, and then flows from the transition chamber 10i to the evaporation chamber 10a; similarly, the condensate in the evaporation chamber 10a first enters the transition chamber 10i, and then flows from the transition chamber 10i to the pressure measuring chamber 10b. This achieves indirect connection between the evaporation chamber 10a and the pressure measuring chamber 10b.

[0096] The heat from the condensate in evaporation chamber 10a needs to be conducted to the condensate in transition chamber 10i first. The condensate in transition chamber 10i heats up and conducts some of the heat to the condensate in pressure measuring chamber 10b. This prevents the condensate in evaporation chamber 10a from directly transferring heat to the condensate in pressure measuring chamber 10b. Furthermore, the condensate in transition chamber 10i shares some of the heat transferred from the condensate in evaporation chamber 10a, effectively reducing the heat transferred to the condensate in pressure measuring chamber 10b. This lowers the probability of the condensate in pressure measuring chamber 10b evaporating and turning into a gaseous substance, thus helping to ensure that the liquid level height measured by the differential pressure level gauge 20 meets the accuracy requirements.

[0097] It is understandable that the connection positions of the transition cavity 10i with the pressure measuring cavity 10b and the evaporation cavity 10a should be conducive to making the liquid levels of the pressure measuring cavity 10b and the evaporation cavity 10a flush.

[0098] For example, the bottom of the transition chamber 10i is connected to the bottom of the pressure measuring chamber 10b and the bottom of the evaporation chamber 10a, respectively. In this way, even when there is little condensate in the pressure measuring chamber 10b and the evaporation chamber 10a, the condensate can still pass through the transition chamber 10i and flow between the pressure measuring chamber 10b and the evaporation chamber 10a.

[0099] The bottom of the transition cavity 10i refers to the bottom wall of the transition cavity 10i along the vertical direction, or the bottom end of the side wall of the transition cavity 10i along the horizontal direction.

[0100] The way in which the transition cavity 10i is connected to the pressure measuring cavity 10b and the evaporation cavity 10a is not limited.

[0101] For example, see Figure 2 and Figure 3 The transition cavity 10i and the pressure measuring cavity 10b are connected through the first channel 10j, and the transition cavity 10i and the evaporation cavity 10a are connected through the second channel 10k. Both the first channel 10j and the second channel 10k extend in the horizontal direction.

[0102] This facilitates the flow of condensate between the evaporation chamber 10a and the transition chamber 10i, and between the transition chamber 10i and the pressure measuring chamber 10b, so as to maintain the condensate surface in the evaporation chamber 10a at the same level as the condensate surface in the pressure measuring chamber 10b.

[0103] Understandably, it is necessary to minimize the probability that the condensate in the evaporation chamber 10a will enter the pressure measuring chamber 10b through the connection between the transition chamber 10i and the pressure measuring chamber 10b after entering the transition chamber 10i.

[0104] In some embodiments, see Figure 2 In an embodiment with a first channel 10j and a second channel 10k, the first channel 10j and the second channel 10k are staggered in the vertical direction.

[0105] In other words, the height of the first channel 10j can be higher than that of the second channel 10k, or the height of the second channel 10k can be higher than that of the first channel 10j.

[0106] This extends the vertical flow path of the condensate between the first channel 10j and the second channel 10k, thereby increasing the residence time of the condensate entering the transition chamber 10i from the evaporation chamber 10a. This allows more heat to be transferred to the condensate in the transition chamber 10i, reducing the probability that the condensate in the evaporation chamber 10a will directly pass through the first channel 10j and the second channel 10k into the pressure measuring chamber 10b.

[0107] In some embodiments, the height of the second channel 10k is higher than the height of the first channel 10j. This helps to prevent condensate in the transition chamber 10i from entering the pressure measuring chamber 10b, while facilitating the entry of condensate in the transition chamber 10i into the evaporation chamber 10a to replenish the condensate consumed in the evaporation chamber 10a.

[0108] In some embodiments, see Figure 3 In an embodiment with a first channel 10j and a second channel 10k, the transition cavity 10i is arranged around the pressure measuring cavity 10b along the horizontal direction, the evaporation cavity 10a is arranged around the transition cavity 10i along the horizontal direction, and the first channel 10j and the second channel 10k are staggered in the circumferential direction.

[0109] This extends the horizontal flow path of the condensate between the first channel 10j and the second channel 10k, thereby increasing the residence time of the condensate entering the transition chamber 10i from the evaporation chamber 10a. This allows more heat to be transferred to the condensate in the transition chamber 10i, reducing the probability that the condensate in the evaporation chamber 10a will directly pass through the first channel 10j and the second channel 10k into the pressure measuring chamber 10b.

[0110] It is understandable that the transition cavity 10i is not directly connected to the transfer cavity 10c.

[0111] The specific physical structure of the evaporation chamber 10a, pressure measuring chamber 10b and transfer chamber 10c formed in the body 10 is not limited.

[0112] For example, see Figures 1 to 3The main body 10 includes an outer shell 11, a cover 12, and a column 13. The outer shell 11 has a first cavity 11a extending vertically inside, with the top side of the first cavity 11a open. The cover 12 covers the open position of the first cavity 11a. The cover 12 has a second cavity 12a extending vertically inside, which communicates with the first cavity 11a. The column 13 extends vertically and is located in the first cavity 11a. The bottom end of the column 13 is connected to the bottom wall of the first cavity 11a. The inner space of the column 13 forms a pressure measuring chamber 10b. The outer wall of the column 13 in the horizontal direction and the inner wall of the first cavity 11a in the horizontal direction are at least partially spaced to form an evaporation chamber 10a. The column 13 and the inner wall of the second cavity 12a are spaced apart. At least a portion of the second cavity 12a forms a transfer chamber 10c.

[0113] The space of the first cavity 11a is used partly to accommodate the pipe pile and partly to form the evaporation cavity 10a.

[0114] The inner space of the tubing column 13 refers to the space enclosed by the tubing wall of the tubing column 13.

[0115] The inner wall of the tube column 13 and the second cavity 12a are spaced apart so that the gaseous substance formed by vaporization and evaporation in the evaporation cavity 10a can enter the transfer cavity 10c through the gap formed between them.

[0116] It is understandable that the connection between the tubing 13 and the housing 11 is a sealed connection to prevent condensate from flowing between the evaporation chamber 10a and the pressure measuring chamber 10b through the joint between them.

[0117] Thus, through the cooperation of the outer shell 11, the tube column 13 and the cover 12, the evaporation chamber 10a, the pressure measuring chamber 10b and the transfer chamber 10c are formed.

[0118] The specific materials of the outer shell 11, the cover 12, and the column 13 are not limited, and the specific materials of the three can be different. In some embodiments, the outer shell 11, the cover 12, and the column 13 are all made of stainless steel.

[0119] It is understandable that the tubing 13 can extend vertically into the second cavity 12a, or it can be located entirely within the first cavity 11a.

[0120] It is understood that in the embodiment with a third connecting hole 10h, the third connecting hole 10h is located on the column 13 and penetrates the wall of the column 13 in a horizontal direction.

[0121] In some embodiments, the housing 12 is a thin-walled, conical structure, such that the second cavity 12a is conical, which in turn facilitates the transfer cavity 10c being conical.

[0122] In some embodiments, the cross-section of the tubing 13 along the horizontal direction is annular, and the shape of the first cavity 11a is cylindrical, thereby making the gas pressure and liquid pressure on the inner wall of the tubing 13 and the first cavity 11a uniform, reducing the probability of damage to the tubing 13 and the outer shell 11.

[0123] In some embodiments, the outer wall of the tubing 13 along the horizontal direction is completely spaced from the inner wall of the first cavity 11a along the horizontal direction, so that the evaporation chamber 10a is arranged around the outer side of the pressure measuring chamber 10b along the horizontal direction.

[0124] In some embodiments, the tubing 13 is located below the inlet 10d so that the condensate can directly enter the inner space of the tubing 13 after entering the second cavity 12a.

[0125] The specific method of forming the transition cavity 10i is not limited.

[0126] For example, see Figure 2 and Figure 3 The tube wall of the tube column 13 is provided with a third cavity 13a, and the bottom of the third cavity 13a is connected to the pressure measuring cavity 10b and the evaporation cavity 10a.

[0127] In other words, the tube wall of the tube column 13 has a hollow structure, and the third cavity 13a forms the transition cavity 10i in the aforementioned embodiment.

[0128] It is understandable that both the first channel 10j and the second channel 10k are located on the tube column 13.

[0129] The heating device 30 can heat the condensate in the evaporation chamber 10a in any way, such as infrared heating or resistance wire heating.

[0130] The specific location of the heating area of ​​the heating device 30 is not limited.

[0131] For example, the heating area of ​​the heating device 30 is located in the evaporation chamber 10a to improve heating efficiency and reduce heat loss of the heating device 30.

[0132] For example, see Figure 1 and Figure 2 The heating device 30 is located on the outer wall of the housing 11. The heating area of ​​the heating device 30 is in close contact with the housing 11, which facilitates the maintenance of the heating device 30. At the same time, it avoids the corrosion of the heating device 30 by the gas and liquid inside the body 10, and extends the service life of the heating device 30.

[0133] This invention also provides a distillation column, which includes any of the reboilers described in the foregoing embodiments.

[0134] The reboiler is located at the bottom of the distillation column, and its inlet 10d is connected to the distillation column of the distillation column so that the condensate produced by the distillation column in the distillation column can flow into the reboiler under the action of gravity.

[0135] The distillation column also includes a distributor to direct the condensate produced by the distillation column into the reboiler.

[0136] It should be noted that the specific structure of the distributor and the distillation column, as well as the corresponding principles for achieving their functions, have already been applied in related technologies, and will not be elaborated here.

[0137] The various embodiments / implementations of this invention can be combined with each other without creating contradictions.

[0138] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present invention should be included within the scope of protection of the embodiments of the present invention.

Claims

1. A reboiler for use in a distillation column, characterized in that, The reboiler includes: The main body includes an evaporation chamber, a pressure measuring chamber, a transfer chamber, and a transition chamber. The evaporation chamber and the pressure measuring chamber are both located below the transfer chamber, and their tops are connected to the transfer chamber. The transfer chamber is provided with a liquid inlet for the condensate in the distillation column to enter the transfer chamber. The bottom of the evaporation chamber is connected to the bottom of the pressure measuring chamber. A differential pressure level gauge is used to obtain the liquid pressure value at the bottom wall of the pressure measuring chamber and the gas pressure value in the transfer chamber; A heating device is used to heat the condensate in the evaporation chamber and vaporize it; The transition chamber connects the evaporation chamber and the pressure measuring chamber, so that the liquid in the pressure measuring chamber and the liquid in the evaporation chamber can be exchanged through the transition chamber. The transition chamber is not directly connected to the transfer chamber. The main body includes an outer shell, a cover, and a column. The outer shell has a first cavity extending vertically, with its top side open. The cover is positioned over the open portion of the first cavity. The cover has a second cavity extending vertically through it, communicating with the first cavity. The column extends vertically and is located within the first cavity. The bottom end of the column is connected to the bottom wall of the first cavity. The inner space of the column forms the pressure measuring chamber. The outer wall of the column in the horizontal direction and the inner wall of the first cavity in the horizontal direction are at least partially spaced to form the evaporation chamber. The column and the inner wall of the second cavity are spaced apart, with at least a portion of the second cavity forming the transfer chamber. A third cavity is provided in the wall of the column, with the bottom of the third cavity communicating with the pressure measuring chamber and the evaporation chamber.

2. The reboiler according to claim 1, characterized in that, The bottom wall of the transfer chamber is provided with a first connecting hole, which extends vertically to connect the transfer chamber and the pressure measuring chamber; And / or, the bottom wall of the transfer chamber is provided with a second connecting hole, which extends vertically to connect the transfer chamber and the evaporation chamber.

3. The reboiler according to claim 1, characterized in that, The inlet is located on the top wall of the transfer chamber, and on the horizontal projection plane, at least a portion of the projection of the inlet is located within the projection range of the communication position between the pressure measuring chamber and the transfer chamber. Alternatively, the projection of the connection point between the pressure measuring chamber and the transfer chamber may be located outside the projection range of the liquid inlet.

4. The reboiler according to claim 1, characterized in that, The evaporation chamber is located on the outer side of the pressure measuring chamber along the horizontal direction.

5. The reboiler according to claim 1, characterized in that, The inlet is located on the top wall of the transfer chamber, which is cone-shaped, and the cross-sectional area of ​​the transfer chamber gradually increases downward in the vertical direction.

6. The reboiler according to claim 4, characterized in that, The transfer chamber is provided with a discharge port, which is located on the inner wall of one side of the transfer chamber along the horizontal direction. The discharge port is used to discharge the gas generated by vaporization in the evaporation chamber from the main body.

7. The reboiler according to claim 4, characterized in that, The low-pressure detection area of ​​the differential pressure level gauge is located on the inner wall of one side of the transfer chamber along the horizontal direction.

8. The reboiler according to claim 1, characterized in that, The bottom of the transition cavity is connected to the bottom of the pressure measuring cavity and the bottom of the evaporation cavity, respectively.

9. The reboiler according to claim 8, characterized in that, The transition chamber and the pressure measuring chamber are connected through a first channel, and the transition chamber and the evaporation chamber are connected through a second channel. Both the first channel and the second channel extend in a horizontal direction. The first channel and the second channel are arranged in a staggered manner along the vertical direction; And / or, the transition cavity is located on the outer side of the pressure measuring cavity along the horizontal direction, the evaporation cavity is located on the outer side of the transition cavity along the horizontal direction, and the first channel and the second channel are staggered circumferentially.

10. A distillation column, characterized in that, The distillation column includes the reboiler described in any one of claims 1-9.

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