Atomization rectifying tower

Abstract

The utility model discloses an atomizing rectifying tower. A tower body is internally divided into a steam rectifying cavity, a stripping cavity and a liquid rectifying cavity by upper and lower partition plates. And a reflux liquid atomizer, a raw material liquid atomizer and a residual liquid atomizer are respectively arranged in the three cavities. Through holes for gas-liquid circulation are evenly distributed in the upper partition plate, steam holes or steam pipes are evenly distributed in the lower partition plate, and a residual liquid outlet in the bottom of the lower partition plate is communicated with a residual liquid atomizer through a residual liquid pipe. A liquid return ring pipe of the backflow liquid atomizer is communicated with a liquid return pipe, and a liquid spraying disc I of the liquid spraying head enables backflow liquid to be splashed into small liquid drops. The raw material liquid atomizer and the residual liquid atomizer are similar in structure, the inner corner angle of a liquid vertical pipe II of an atomizing nozzle is a cambered surface or an inclined surface, and a liquid spraying disc II is mounted at a port. The gas nozzles are uniformly distributed at the end part of the gas vertical pipe and face the cambered surface or the inclined surface of the inner corner angle, the sprayed gas flow can cut the liquid flow twice, and the liquid is atomized into fine liquid drops. According to the utility model, the heat and mass transfer interface is increased through liquid atomization, the dynamics is enhanced, the tower height is reduced, and the structure in the tower is simplified.

Description

Technical Field

[0001] The utility model is applied to the field of chemical industry and relates to the distillation separation of chemical products, in particular to a distillation tower which adopts atomization mode for distillation. Background Art

[0002] Distillation is usually carried out in a distillation tower. Figure 1 This is a screenshot of the online distillation process flow of the prior art. The gas-liquid two-phase contact in the distillation tower through countercurrent, the liquid flows down along the tower plate, and the vapor flows up from the tower plate holes to carry out gas-liquid two-phase heat and mass transfer. The volatile components in the liquid phase enter the gas phase, and the non-volatile components in the gas phase are transferred to the liquid phase, so that almost pure volatile components can be obtained at the top of the tower, and almost pure non-volatile components can be obtained at the bottom of the tower. The feed liquid is added from the middle of the tower, and the tower section above the feed port further concentrates the volatile components in the rising vapor, which is called the distillation section. The tower section below the feed port extracts the volatile components from the descending liquid, which is called the stripping section. The vapor drawn from the top of the tower is condensed, and a part of the condensate is returned to the distillation tower from the top of the tower as reflux liquid, and the remaining distillate is the top product. The liquid drawn from the bottom of the tower is partially vaporized by the reboiler, and the vapor rises along the tower, and the remaining liquid is the bottom product. The ratio of the amount of liquid refluxed into the tower from the top to the amount of product from the top is called the reflux ratio, and its size will affect the separation effect and energy consumption of the distillation operation.

[0003] The theoretical basis of distillation is the gas-liquid two-phase equilibrium. The gas-liquid phase equilibrium constant is the ratio of the mole fraction of the component in the gas phase to the mole fraction of the component in the liquid phase, which is also equal to the ratio of the saturated vapor pressure of the component at the boiling point to the partial pressure of the component in the gas phase. The saturated vapor pressure is related to the temperature, and the component partial pressure is the product of the total pressure and the mole fraction of the component in the gas phase, which is related to the total pressure. Therefore, the gas-liquid phase equilibrium constant is a function of temperature and pressure. When the temperature and total pressure are determined, the gas-liquid phase equilibrium constant is a constant, which determines the number of moles of the component in the gas and liquid phases. This is why the reflux liquid of the condenser refluxes the distillation vapor at the top of the tower. If the reflux ratio is small, the distillation effect is poor, and if the reflux ratio is large, it will cause energy waste, so the minimum reflux ratio is emphasized.

[0004] Distillation towers can be roughly divided into plate towers and packed towers. The plates of plate towers can be divided into sieve plates, bubble caps, float valves, floating tongues, etc. The packing of packed towers can be divided into bulk packing, grid packing, corrugated packing, pulse packing, etc. In both tower types, liquid flows down and gas flows up, and the gas and liquid phases are in countercurrent contact for heat and mass exchange. Gas-liquid two-phase equilibrium is to solve the thermodynamic problem of distillation, and the distillation tower solves the kinetic problem of distillation. In order to achieve full contact and exchange between the gas and liquid phases, the distillation tower is usually very high, ranging from more than ten meters to tens of meters, and some are almost 100 meters high.

[0005] In order to reduce the height of the distillation tower and increase the vapor-liquid interface area, CN107297084A discloses an atomizing tray and an atomizing tray distillation tower, wherein a liquid phase atomizing device is installed on the tray, including a truncated cone-shaped inlet section, a cylindrical throat and a trumpet-shaped outlet section, and liquid phase injection holes are evenly distributed on the throat. When the liquid phase passes through the injection holes, it is cut into fine droplets by the gas phase, and the droplet diameter is micrometer-level. Compared with the millimeter-level bubbles in the traditional plate tower, the contact area between the gas and liquid phases is greatly increased, and the transfer efficiency of the gas and liquid phases is greatly improved. Due to the slow flow rate of the liquid phase and the gas phase, the effect of the gas phase cutting the liquid phase is limited. Although the contact area between the gas and liquid phases is increased compared with the traditional plate tower, due to the limited flow rate or pressure difference, the droplets are difficult to be atomized into micrometer level. CN105920861A discloses a spray distillation device, wherein the upper part of the evaporation chamber shell is equipped with a raw material liquid atomizer connected to the raw material liquid feed pipe, the lower part is equipped with a water vapor distributor connected to the water vapor inlet pipe, and multiple water vapor nozzles are evenly distributed on the water vapor distribution plate. The upper end of the shell is connected to the distillation column, the distillation column is filled with fillers or orifice plates, the upper part is provided with a reflux water sprinkling ring, and the lower part is provided with a reflux air permeable cap and a residual liquid outflow port. The lower end of the shell is connected to the residual liquid processor, and the residual liquid processor is alternately provided with large and small residual liquid processing disks, and the residual liquid processing disk is provided with a residual liquid heating ring that is advantageously heated by water vapor, and the bottom of the residual liquid processor is provided with a waste liquid discharge port. The reflux liquid processing device is circumferentially installed on the inner wall of the evaporation chamber shell, the upper part of the device is provided with a reflux liquid conduit and a water sprinkling ring, the reflux liquid conduit is connected to the residual liquid outflow port of the distillation column, the middle part is a filler mesh ring, the lower part is provided with a mounting plate, the mounting plate is evenly provided with residual liquid air permeable caps, and the lower part is provided with a residual liquid discharge pipe, and the residual liquid discharge pipe guides the residual liquid to the residual liquid processing disk. Compared with the traditional distillation tower, the similarity between this patent application and the traditional distillation tower is that the volatile phase distillation still uses the traditional packing method. The volatile phase vapor passes through the residual liquid breather cap into the packing column, and is concentrated by mass transfer, heat transfer and concentration with the reflux liquid coming down from the packing or orifice plate. The residual liquid formed in the distillation column is sprinkled on the packing mesh ring through the residual liquid outflow, the reflux liquid conduit and the watering ring, and is heat and mass transferred with the steam coming up from below, so that the volatile phase evaporates upward and the non-volatile phase descends. There are three main differences: 1) The raw liquid is atomized separately, and then combined with the steam to be heated and vaporized; 2) The entire distillation process from the reflux liquid to the residual liquid does not pass through the evaporation chamber; 3) A residual liquid processor is added at the bottom, and the residual liquid is heated by the heating ring, and the volatile phase continues to evaporate. Although this patent application atomizes the raw liquid and improves the distillation efficiency, the reflux liquid is not atomized, but the traditional packing distillation method is used, which does not improve the distillation efficiency. Utility Model Content

[0006] The technical problem solved by the utility model is to provide an atomizing distillation tower, the overall idea of ​​which is to atomize the liquid, increase the heat and mass transfer interface between the gas and liquid phases, strengthen the dynamic process, and thus reduce the height of the distillation tower. First, the gas phase distillation efficiency is improved by atomizing the liquid phase with pressurized reflux liquid; second, the stripping efficiency and liquid phase distillation efficiency are improved by atomizing the gas and liquid phases simultaneously.

[0007] The technical solution adopted by the utility model is: the tower body of the atomizing distillation tower is divided into an upper vapor distillation chamber, a middle stripping chamber and a lower liquid distillation chamber by an upper partition and a lower partition. A reflux liquid atomizer is arranged in the vapor distillation chamber, a raw liquid atomizer is arranged in the stripping chamber, and a residual liquid atomizer is arranged in the liquid distillation chamber. Through holes are evenly distributed on the upper partition, and the through holes can realize that the residual liquid in the vapor distillation chamber falls into the stripping chamber, and the volatile vapor in the stripping chamber can enter the vapor distillation chamber. The residual liquid outlet at the bottom end of the lower partition is connected to the residual liquid atomizer through a residual liquid pipe, and steam holes or steam pipes are evenly distributed on the lower partition, and the steam holes or steam pipes can only realize that the steam in the liquid distillation chamber enters the stripping chamber, and the residual liquid in the stripping chamber can only enter the residual liquid atomizer through the residual liquid pipe.

[0008] Preferably, the reflux liquid atomizer includes a liquid return ring pipe and a liquid spray head, the liquid return ring pipe is connected to the liquid return pipe, and a liquid return pump is arranged on the liquid return pipe. The liquid spray head includes a liquid riser pipe I, a connecting rod I and a liquid spray plate I. The nozzle of the liquid riser pipe I is provided with a conical liquid spray plate I, and the liquid spray plate I is fixedly connected to the liquid riser pipe I through the connecting rod I. When the reflux liquid is sprayed to the liquid spray plate I, it splashes into fine droplets.

[0009] Preferably, the raw material liquid atomizer comprises an air ring pipe, a feed ring pipe and an atomizing nozzle. The atomizing nozzle comprises a set of air riser and liquid riser II, the air riser is connected to the air ring pipe, and the liquid riser II is connected to the feed ring pipe.

[0010] Preferably, the residual liquid atomizer comprises a residual liquid annular pipe, a return steam annular pipe and an atomizing nozzle. The atomizing nozzle has a similar structure to the above-mentioned atomizing nozzle, comprising a set of gas riser and liquid riser II, the gas riser is connected to the return steam annular pipe, and the liquid riser II is connected to the residual liquid annular pipe.

[0011] Preferably, the inner corners of the port of the liquid riser II of the above-mentioned atomizing nozzle are arcuate or inclined surfaces, and a conical liquid spray disc II is installed at the port, and the liquid spray disc II is fixedly connected to the liquid riser II through a connecting rod II. The port of the gas riser is sealed with a plug, and the gas nozzles are evenly distributed on the circumference of the end of the gas riser, and the gas nozzles face the arcuate or inclined surfaces of the inner corners of the port of the liquid riser II. When the gas and liquid of the atomizing nozzle are atomized simultaneously, the ejected airflow and the airflow returned by the arcuate or inclined surface can cut the liquid flow twice, atomizing the liquid into micron-sized fine droplets, greatly increasing the gas-liquid two-phase interface area, and achieving the purpose of strengthening the dynamic process.

[0012] Preferably, a residual liquid pump is provided on the residual liquid pipe, and the residual liquid pipe is connected to the residual liquid ring pipe. The residual liquid pump can pressurize the residual liquid, which is helpful for atomization of the residual liquid.

[0013] Preferably, the lower partition is concave, which can reduce the stress caused by thermal expansion and contraction and facilitate the collection of residual liquid.

[0014] The beneficial effects of the utility model are as follows: the atomization of the reflux liquid in the steam distillation chamber strengthens the dynamic process of the volatile steam distillation and improves the efficiency of the volatile steam distillation; the raw liquid in the stripping chamber is atomized simultaneously with the high-energy gas, which strengthens the dynamic process of the stripping and improves the distillation efficiency of the raw liquid; the residual liquid in the liquid distillation chamber is atomized simultaneously with the steam, which strengthens the dynamic process of the residual liquid distillation and improves the residual liquid distillation efficiency. Thereby, the effective height of the distillation tower is reduced as a whole, and the internal structure of the distillation tower is simplified. The number of process parameter collection and control is small, and the automatic control is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the distillation process flow of the prior art;

[0016] Figure 2 is a schematic diagram of a distillation system of Example 1;

[0017] Figure 3 yes Figure 1 AA cross-sectional view of ;

[0018] Figure 4 Schematic diagram of the liquid nozzle structure;

[0019] Figure 5 It is a schematic diagram of the structure of the atomizing nozzle;

[0020] Figure 6 is a schematic diagram of the structure of Example 2;

[0021] Figure 7 is a schematic diagram of the liquid distillation chamber structure of Example 3;

[0022] In the figure: 1-reboiler, 2-steam return pipe, 3-steam return pump, 4-residual liquid pump, 5-residual liquid pipe, 6-gas ring pipe, 7-feed pipe, 8-feed ring pipe, 9-liquid return ring pipe, 10-liquid return pipe, 11-liquid return pump, 12-condenser, 13-gas phase pipe, 14-liquid nozzle, 15-steam distillation chamber, 16-upper partition, 17-through hole, 18-stripping chamber, 19-atomizing nozzle, 20-inlet pipe, 21-steam hole, 22-lower partition, 23-liquid distillation chamber, 24-residual liquid ring pipe, 25-steam return ring pipe, 26-liquid phase pipe, 27-steam pipe;

[0023] 141-liquid riser Ⅰ, 142-connecting rod Ⅰ, 143-liquid spray plate Ⅰ;

[0024] 191-gas riser, 192-gas nozzle, 193-plug, 194-liquid spray plate II, 195-connecting rod II, 196-cambered surface, 197-liquid riser II, 198-liquid ring pipe. DETAILED DESCRIPTION

[0025] The following "up and down" refers to the relative position of the upper and lower parts in the state of use, that is, Figure 1 The relative position of the tower body. The "inside and outside" in the following text refers to the inside and outside of the tower body. The solid arrows in the attached drawings are the flow direction of the liquid, and the dotted arrows are the flow direction of the gas. The "Ⅰ, Ⅱ" in the following text are only for the distinction and description of the components, and do not represent the order.

[0026] For ease of understanding, the "gas" and "liquid" mentioned below are relative, such as gas-liquid, gas phase-liquid phase. The "volatile steam" mentioned below refers to the gas in the steam distillation chamber and the stripping chamber, and "steam" mainly refers to the gas in the liquid distillation chamber, all of which contain high-energy gas for heating.

[0027] Example 1.

[0028] The schematic diagram of the distillation system composed of the atomizing distillation tower in this embodiment is shown in the attached figure. Figure 2 As shown, it includes a reboiler 1, a distillation tower, and a condenser 12. The tower body of the distillation tower is divided into an upper vapor distillation chamber 15, a middle stripping chamber 18, and a lower liquid distillation chamber 23 by an upper partition 16 and a lower partition 22. Figure 3 It is a cross-sectional view of the stripping chamber 18 in the middle of the distillation tower.

[0029] The top of the vapor rectification chamber 15 is connected to the condenser 12 through the gas phase pipe 13, and the return liquid pipe 10 at the bottom of the condenser 12 is connected to the reflux liquid atomizer in the vapor rectification chamber 15. The reflux liquid atomizer includes a return liquid ring pipe 9 and a liquid spray head 14. The return liquid ring pipe 9 is connected to the return liquid pipe 10. A return liquid pump 11 is arranged on the return liquid pipe 10. The return liquid pump 11 is a high-pressure small flow pump, and its flow rate meets the flow rate requirements of the reflux liquid. The liquid spray heads 14 are evenly distributed vertically downward on the return liquid ring pipe 9. The liquid spray heads 14 can have a variety of structural forms. The structure of the liquid spray head 14 in this embodiment is as shown in the attached figure. Figure 4 As shown, it includes a liquid riser Ⅰ141, a connecting rod Ⅰ142, and a liquid spraying plate Ⅰ143. The liquid riser Ⅰ141 is connected to the liquid return ring pipe 9, and a liquid spraying plate Ⅰ143 is arranged at the nozzle of the liquid riser Ⅰ141, and the liquid spraying plate Ⅰ143 is fixedly connected to the liquid riser Ⅰ141 through the connecting rod Ⅰ142. The liquid spraying plate Ⅰ143 is conical, and its outer surface can be a conical surface or an arc surface. When the reflux liquid is sprayed to the liquid spraying plate Ⅰ143 at a high speed, the reflux liquid can be splashed and atomized into micron-level fine droplets. The bottom of the steam rectification chamber 15 is an upper partition 16, and the upper partition 16 is processed with uniformly distributed through holes 17, which can make the residual liquid after rectification fall into the stripping chamber 18, and at the same time make the volatile vapor in the stripping chamber 18 rise to the steam rectification chamber 15.

[0030] The top of the stripping chamber 18 is an upper partition 16, the bottom is a lower partition 22, and a raw material liquid atomizer is installed in the middle. The raw material liquid atomizer includes an air ring pipe 6, a feed ring pipe 8 and an atomizing nozzle 19, as shown in the attached Figure 2 and attached Figure 3As shown, the feed ring pipe 8 is connected to the feed pipe 7, and the feed pipe 7 is used to feed the raw material liquid to the distillation tower. The gas ring pipe 6 is connected to the air inlet pipe 20, and the air inlet pipe 20 is used to feed high-energy gas such as water vapor or hot air to the distillation tower. The atomizing nozzle 19 can be in various forms. The structure of the atomizing nozzle 19 in this embodiment is shown in the attached figure. Figure 5 As shown, it includes a set of gas riser 191 and liquid riser II 197, the gas riser 191 is connected to the gas ring pipe 6, and the liquid riser II 197 is connected to the liquid ring pipe 198, and the liquid ring pipe 198 here is the feed ring pipe 8. The gas riser 191 passes through the liquid ring pipe 198 and is set in the liquid riser II 197. The inner corner of the port of the liquid riser II 197 is a curved surface 196, or a slope. A liquid spray disc II 194 is installed at the port, and the liquid spray disc II 194 is fixedly connected to the liquid riser II 197 through a connecting rod II 195. The liquid spray disc II 194 is conical, and its surface can be a conical surface or a circular arc surface. The port of the gas riser 191 is sealed with a plug 193, and gas nozzles 192 are evenly distributed around the circumference of the end of the gas riser 191. The gas ejected from the gas nozzles 192 is directed toward the arc surface 196 or the inclined surface at the inner corner of the port of the liquid riser II 197. When the raw material liquid is atomized, the pressurized raw material liquid impacts the liquid spray plate II 194 at high speed and splashes into fine droplets. At the same time, the airflow rushing out from the gas nozzle 192 of the gas riser 191 at high speed can cut the raw material liquid into fine droplets. The airflow returns through the arc surface or the inclined surface and cuts the raw material flow again. In this way, under the combined action of the cutting of the high-speed airflow and the splashing of the spray plate, the raw material liquid is atomized into micron-sized fine droplets or evaporated into volatile vapor, which greatly increases the interface area between the gas and liquid phases, improves the vaporization heat transfer and mass transfer dynamics process, and improves the distillation speed and efficiency.

[0031] The top of the liquid distillation chamber 23 is a lower partition 22, and the bottom is connected to the reboiler 1 through a liquid phase pipe 26, and a residual liquid atomizer is installed in the middle. The lower partition 22 is processed with evenly distributed steam holes 21, and a residual liquid outlet is set at the lowest position. The residual liquid outlet is connected to the residual liquid atomizer through a residual liquid pipe 5, and a residual liquid pump 4 is set on the residual liquid pipe 5. The flow rate of the residual liquid pump 4 can be adjusted according to the liquid level on the lower partition 22. The diameter of the steam hole 21 is small, and under the action of the surface tension of the residual liquid and the buoyancy of the gas, the residual liquid will not fall, but can only pass through the steam upward. The residual liquid can only enter the residual liquid atomizer through the residual liquid pipe 5 for atomization. The structure of the residual liquid atomizer is similar to that of the raw liquid atomizer, including a residual liquid annular pipe 24, a return steam annular pipe 25 and an atomizing nozzle 19. The structure of the atomizing nozzle 19 is shown in the attached figure. Figure 5As shown, the gas riser 191 is connected to the steam return loop 25, the liquid loop 198 is the residual liquid loop 24, and the residual liquid loop 24 is connected to the residual liquid pipe 5. The steam return loop 25 is connected to the reboiler 1 through the steam return pipe 2, and the steam return pump 3 is installed on the steam return pipe 2. The flow rate of the steam return pump 3 can be automatically adjusted according to the flow rate change of the residual liquid pump 4. When the flow rate of the steam return pump 3 increases, a relative negative pressure is formed in the reboiler 1, and the steam volume increases. When the steam return pump 3 works stably, the gas-liquid two-phase in the reboiler 1 maintains a basic balance, and the steam volume is stable.

[0032] The distillation process of the atomizing distillation tower in this embodiment is as follows:

[0033] 1) The raw material liquid is pressurized and fed into the raw material liquid atomizer of the stripping chamber 18 through the feed pipe 7. At the same time, the high-energy gas is fed into the raw material liquid atomizer through the air inlet pipe 20. The raw material liquid is atomized into micron-sized fine droplets under the action of the atomizing nozzle 19, and the gas-liquid two-phase interface is greatly increased, which improves the stripping speed and efficiency. The raw material liquid is stripped into volatile vapor and residual liquid. The volatile vapor enters the steam distillation chamber 15 through the through hole 17 of the upper partition 16, and the residual liquid enters the residual liquid atomizer through the residual liquid pipe 5 at the bottom of the lower partition 22.

[0034] 2) The reflux liquid atomizer in the vapor distillation chamber 15 atomizes the reflux liquid sent in by the reflux pump 11, and contacts with the volatile vapor entering the vapor distillation chamber 15 to transfer heat and mass. The reflux liquid is basically a volatile component liquid. As a result of heat transfer, the reflux liquid evaporates again. As a result of mass transfer, the non-volatile components in the volatile vapor enter the residual liquid. The volatile components in the volatile vapor are retained and purified, and sent to the condenser 12 from the gas phase pipe 13. Except for part of the volatile component liquid in the condenser 12 that refluxes, the rest becomes the top product. The residual liquid falls into the stripping chamber 18 through the through hole 17 of the upper partition 16 and merges with the residual liquid in the stripping chamber 18.

[0035] 3) The residual liquid atomizer of the liquid distillation chamber 23 receives not only the residual liquid from the stripping chamber 18, but also the steam from the reboiler 1, which is mainly the volatile vapor of the non-volatile components and high-energy gas. The residual liquid is atomized into micron-sized fine droplets under the action of the atomizing nozzle 19, and the interface between the residual liquid and the steam is greatly increased. As a result of heat and mass transfer, the volatile components in the residual liquid become steam, and the residual liquid is distilled into liquid. The steam enters the stripping chamber 18 through the steam holes 21 on the lower partition 22, and the liquid enters the reboiler 1 through the liquid phase pipe 26. Except for a part of the liquid in the reboiler 1 that is heated and volatilized into steam and enters the liquid distillation chamber 23, the rest becomes the bottom product.

[0036] Example 2.

[0037] The structure of the atomizing distillation tower in this embodiment is shown in the attached figure. Figure 6As shown, the difference from Example 1 is that: 1) the liquid spray head 14 of the reflux liquid atomizer is upward, and the sprayed atomized liquid droplets have a process of spraying up and down, which can increase the contact time with the volatile vapor in the steam distillation chamber 15 and strengthen the volatile vapor distillation. 2) The upper partition 16 is changed from an arch to a flat plate. The arched partition helps to reduce the stress caused by thermal expansion and contraction, and the flat plate helps the residual liquid to fall evenly. 3) The raw liquid atomizer is changed from the downward spray atomization in Example 1 to the upward spray atomization, which helps to reduce the volatile vapor flow rate in the steam distillation chamber 15, increase the heat and mass transfer time with the reflux liquid, and strengthen the volatile vapor distillation from another angle. 4) The lower partition 22 still adopts a concave type, or a spherical panel or an arc panel, which helps to reduce the stress caused by thermal expansion and contraction, and helps to collect the residual liquid. It is just that the uniformly distributed small-diameter steam holes 21 in Example 1 are changed into uniformly distributed large-diameter steam pipes 27 to separate the steam and residual liquid flows. Since atomization is used to increase the contact area between the gas and liquid phases, the steam holes 21 of the lower partition 22 are no longer necessary or have little effect on the heat and mass transfer between the gas and liquid, and a simple steam pipe 27 can meet the requirement of steam rising. Only a cap needs to be designed on the top of the steam pipe 27 to prevent the residual liquid from passing through the steam pipe 27 instead of entering the liquid distillation chamber 23 through the residual liquid pipe 5.

[0038] Example 3.

[0039] This embodiment mainly involves the change of the residual liquid pipe 5, as shown in the attached Figure 7 As shown, the residual liquid pipe 5 is directly connected to the residual liquid ring pipe 24 downward, and the atomizing nozzle 19 is vertically downward, and the residual liquid automatically flows down under the drive of dead weight and steam. In this way, the residual liquid pump 4 can be omitted, which is conducive to simplifying the structure and automatic control.

[0040] In order to ensure that steam and volatile vapor flow from bottom to top, the gas pressure of the liquid distillation chamber 23 should be greater than that of the stripping chamber 18, and the gas pressure of the stripping chamber 18 should be greater than that of the steam distillation chamber 15. There is no external air pressure in the steam distillation chamber 15, while there is external high-energy gas in the stripping chamber 18, which requires that the external air flow of the stripping chamber should be small to meet the atomization of the raw liquid. The gas pressure of the liquid distillation chamber 23 is the largest, and the gas pressure comes from the steam in the reboiler.

[0041] The utility model adopts the method of atomizing liquid into micron-sized droplets to increase the contact area between gas and liquid phases, improve the heat and mass transfer dynamics process, thereby improving the stripping and rectification efficiency and shortening the height of the rectification tower. In particular, the atomizing nozzle 19 realizes multiple gas cutting of the liquid flow, ensuring that the atomization requirements of the droplets can be met even when the liquid flow pressure is not large.

[0042] The utility model improves the distillation efficiency, the distillation tower is transformed from a thin and tall shape to a flat shape, and the effective height of the distillation tower is reduced to less than ten meters. At the same time, the structure of the distillation tower is simplified, and several layers of tower plates and a large number of bubble caps, float valves, float tongues, tower weirs, downcomers, etc. on the tower plates are omitted, as well as a large number of temperature and pressure detection instruments and meters, the number of process parameter collection and control is small, and the automatic control is simpler.

Claims

1. An atomizing distillation tower, characterized in that: The tower body is divided into an upper vapor distillation chamber (15), a middle stripping chamber (18) and a lower liquid distillation chamber (23) by an upper partition (16) and a lower partition (22); a reflux liquid atomizer is arranged in the vapor distillation chamber (15); a raw liquid atomizer is arranged in the stripping chamber (18); and a residual liquid atomizer is arranged in the liquid distillation chamber (23); through holes (17) are evenly distributed on the upper partition (16); a residual liquid outlet at the bottom end of the lower partition (22) is connected to the residual liquid atomizer through a residual liquid pipe (5); and steam holes (21) or steam pipes (27) are evenly distributed on the lower partition (22).

2. An atomizing distillation tower according to claim 1, characterized in that: The reflux liquid atomizer comprises a liquid return ring pipe (9) and a liquid spray head (14); the liquid return ring pipe (9) is connected to a liquid return pipe (10); and a liquid return pump (11) is arranged on the liquid return pipe (10).

3. An atomizing distillation tower according to claim 2, characterized in that: The liquid spray head (14) comprises a liquid riser tube I (141), a connecting rod I (142) and a liquid spray disc I (143); a conical liquid spray disc I (143) is provided at the nozzle of the liquid riser tube I (141), and the liquid spray disc I (143) is fixedly connected to the liquid riser tube I (141) via the connecting rod I (142).

4. The atomizing distillation tower according to claim 1, characterized in that: The raw material liquid atomizer comprises an air ring pipe (6), a feed ring pipe (8) and an atomizing nozzle (19); the atomizing nozzle (19) comprises a set of air riser pipe (191) and a liquid riser pipe II (197); the air riser pipe (191) is connected to the air ring pipe (6), and the liquid riser pipe II (197) is connected to the feed ring pipe (8).

5. The atomizing distillation tower according to claim 1, characterized in that: The residual liquid atomizer comprises a residual liquid annular pipe (24), a return steam annular pipe (25) and an atomizing nozzle (19); the atomizing nozzle (19) comprises a set of gas riser (191) and liquid riser II (197); the gas riser (191) is connected to the return steam annular pipe (25), and the liquid riser II (197) is connected to the residual liquid annular pipe (24).

6. An atomizing distillation tower according to claim 4 or 5, characterized in that: The inner corner of the port of the liquid riser pipe II (197) is an arc surface or an inclined surface, and a conical liquid spray disc II (194) is installed at the port, and the liquid spray disc II (194) is fixedly connected to the liquid riser pipe II (197) through a connecting rod II (195); the port of the gas riser pipe (191) is sealed with a plug (193), and the end of the gas riser pipe (191) is evenly distributed with gas nozzles (192) on the circumference, and the gas nozzles (192) face the arc surface and the inclined surface of the inner corner of the port of the liquid riser pipe II.

7. The atomizing distillation tower according to claim 5, characterized in that: A residual liquid pump (4) is arranged on the residual liquid pipe (5), and the residual liquid pipe (5) is connected to the residual liquid ring pipe (24).

8. The atomizing distillation tower according to claim 1, characterized in that: The lower partition (22) is concave.

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