A distillation and purification device

Abstract

The invention relates to the field of distillation, and discloses a distillation purification device, including a distillation tower, which is a packing type, and a liquid inlet pipe and a liquid distributor are arranged at the top of the distillation tower, and the liquid distributor includes a main pipe, a plurality of branch pipes and a plurality of distribution slots which are connected in sequence, the liquid inlet pipe is connected to the main pipe, and the plurality of distribution slots are arranged horizontally and in parallel at the same height, and the distribution slots all include a base groove and an adjustment cover which cooperate with each other, a plurality of vertical first strip holes are arranged on the side of the base groove, and the adjustment cover is arranged vertically and slidingly in the base groove, and a second notch is arranged on the side of the adjustment cover, and the second notch passes through the lower edge of the side of the adjustment cover; in the initial state, the second notch and the first strip hole are partially overlapped, and the adjustment cover partially blocks the first strip hole; when the hydraulic pressure in the base groove increases, the hydraulic pressure drives the adjustment cover away from the base groove, and the blocking area of ​​the first strip hole by the adjustment cover is reduced, and the flow rate of the first strip hole is increased. So as to be able to adapt to different flow rates and evenly distribute the liquid.

Description

Technical Field

[0001] The invention relates to the field of distillation, and in particular to a distillation purification device. Background Art

[0002] A distillation tower is a tower-type gas-liquid contact device for distillation. It is mainly used to separate mixed liquids. It uses the principle that different liquids have different volatilities (boiling points) at different temperatures to separate liquids, thereby achieving a purification effect.

[0003] Among them, the distillation tower includes a packed distillation tower. The liquid enters the liquid distributor through the liquid inlet pipe at the top of the distillation tower, so that the liquid is evenly distributed in the distillation tower, avoiding problems such as unstable equipment operation and reduced product quality due to uneven distribution.

[0004] In actual application, different flow rates are often required according to different needs. For example, some products have lower purity requirements, so the flow rate can be increased to improve production efficiency; while some products have higher purity requirements, so the flow rate can be reduced to improve product purity.

[0005] However, the existing trough-type liquid distributor has a fixed outlet size, so the flow rate is fixed. If the flow rate is too small, the liquid will be sprayed at a low speed, and the spraying effect cannot be formed, which reduces the effect of uniform liquid distribution; if the flow rate is too large, the liquid will directly overflow the trough, and will not be distributed along the trough and flow out of the outlet, which also reduces the effect of uniform liquid distribution.

[0006] Therefore, a distillation and purification device is needed that can adapt to different flow rates and evenly distribute the liquid. Summary of the invention

[0007] The present invention aims to provide a distillation and purification device which can adapt to different flow rates and evenly distribute liquid.

[0008] To achieve the above object, the present invention adopts the following technical scheme: a distillation purification device, including a distillation tower, the distillation tower is a packing type, a liquid inlet pipe and a liquid distributor are arranged on the top of the distillation tower, the liquid distributor includes a main pipe, a plurality of branch pipes and a plurality of distribution grooves connected in sequence, the liquid inlet pipe is connected to the main pipe, the plurality of distribution grooves are arranged horizontally and in parallel at the same height, the distribution grooves all include a base groove and an adjustment cover that cooperate with each other, a plurality of vertical first strip holes are arranged on the side of the base groove, the adjustment cover is vertically slidably arranged in the base groove, a second notch is arranged on the side of the adjustment cover, and the second notch passes through the lower edge of the side of the adjustment cover;

[0009] In the initial state, the second notch and the first strip hole partially overlap, and the adjusting cover partially blocks the first strip hole; when the hydraulic pressure in the base groove increases, the hydraulic pressure drives the adjusting cover away from the base groove, the blocking area of ​​the first strip hole by the adjusting cover decreases, and the flow rate of the first strip hole increases.

[0010] The beneficial effects of this program are:

[0011] The liquid passes through the liquid inlet pipe, the main pipe, the branch pipe, the distribution groove and the first strip hole (equivalent to the water outlet hole in the prior art) in sequence, so as to be evenly distributed in the distillation tower; in this scheme, since the liquid distributor is directly connected to the liquid inlet pipe, the regulating cover can be directly driven to move by changing the hydraulic pressure, so as to adjust the relative position of the second notch and the first strip hole, change the shielding area of ​​the first strip hole, and then adjust the flow rate; so that the evaporation tower can adapt to different flow rates and evenly distribute the liquid. When the hydraulic pressure is large, the regulating cover is away from the base groove, so that the flow cross section in the base groove becomes larger, the shielding area of ​​the first strip hole becomes smaller, and the flow cross section of the first strip hole becomes larger, which not only increases the flow rate, but also prevents the liquid in the base groove from directly overflowing; when the hydraulic pressure is reduced, the regulating cover is close to the base groove, so that the flow cross section in the base groove is reduced, and the shielding area of ​​the first strip hole is reduced, so as to maintain the hydraulic pressure, ensure that the liquid forms a spraying effect when it flows out of the first strip hole, and then the liquid is evenly distributed in the evaporation tower, so that the equipment runs stably and the product quality is guaranteed. In the prior art, in order to ensure the spraying effect, the width of the water outlet hole should not be too large, and the liquid may contain suspended particles or sediments, which may block the water outlet hole. In this solution, the regulating cover can move when the hydraulic pressure changes, thereby scraping the inside of the first strip hole, and then hanging off the particles or sediments inside the first strip hole, avoiding the particles or sediments blocking the first strip hole. Further, the pipe is arranged horizontally, and the two ends of the main pipe are connected to the side wall of the distillation tower, and the main pipe is connected to the upper ends of several branch pipes respectively.

[0012] Furthermore, a gas distributor is provided on the top of the distillation tower. The gas distributor includes a plurality of horizontal, parallel V-shaped grooves. In the horizontal direction, the V-shaped groove is located between two adjacent base grooves of the liquid distributor; and the space between adjacent V-shaped grooves is used for gas to pass through.

[0013] Such arrangement is used to reduce the rising speed of the gas and make the gas and liquid fully contact;

[0014] Specifically, the V-shaped groove is located between two adjacent base grooves of the liquid distributor, increasing the passage distance of the gas; the liquid flows into the V-shaped groove, and then overflows from the V-shaped groove and flows downward, increasing the passage distance of the liquid.

[0015] Furthermore, the second notch is divided into a plurality of n-shaped second strip holes, and the number of the second strip holes is equal to that of the first strip holes and their positions correspond one to one.

[0016] Furthermore, a first notch is provided on the side of the regulating cover, the notch is connected to a plurality of first strip holes, and the second notch is equal in length to the first notch;

[0017] In the initial state, the second notch and the first strip hole partially overlap, and the adjustment cover partially covers the first strip hole;

[0018] When the hydraulic pressure in the base groove increases, the hydraulic pressure drives the adjustment cover away from the base groove, the covering area of ​​the first strip hole by the adjustment cover decreases, the second notch partially overlaps with the first notch, and the adjustment cover partially covers the first notch;

[0019] Finally, the first strip-shaped hole and the first notch are completely exposed.

[0020] With such arrangement, when the hydraulic pressure is relatively small, the regulating cover completely blocks the first gap, and all the liquid flows out from the first strip holes; when the hydraulic pressure is relatively large, the first strip holes can no longer adapt to the flow rate of the liquid, and at this time the first gap gradually leaks out, increasing the area of ​​the flow interface. Since the first gap connects all the first strip holes, the liquid flowing out of the first gap forms a first water curtain barrier, and the first water curtain barrier is a horizontal trajectory. The first water curtain barrier blocks the channel for the gas to rise, forcing the gas to pass through the first water curtain barrier, thereby ensuring complete contact between gas and liquid and increasing the purification efficiency.

[0021] Furthermore, the initial horizontal velocity of the liquid when it sprays out of the first notch is V0, and V0 satisfies the following formula:

[0022] = ;

[0023] D-the distance between adjacent base grooves;

[0024] g - acceleration due to gravity;

[0025] h - the height difference from the bottom of the first strip hole to the lowest point in the V-shaped groove.

[0026] With such an arrangement, under the same hydraulic pressure, the initial velocity of the liquid ejected from the first strip hole approaches the same. If the initial velocity is too large, the adjacent first water curtain barriers will impact each other, destroying the integrity of the first water curtain barrier, and the gas will flow out from the gap formed by the impact, making it impossible to ensure complete contact between gas and liquid, thereby reducing the purification efficiency. If the initial velocity is too small, the area of ​​the first water curtain barrier will also become smaller, and the amount of liquid in contact with the gas per unit time will also decrease, thereby reducing the purification efficiency.

[0027] Therefore, the initial speed meets = ; When the liquid sprayed from the first strip holes of adjacent base grooves falls on the same position, the gas-liquid contact amount is the largest and the purification efficiency is the highest.

[0028] In this scheme, when the hydraulic pressure is not constant, the hydraulic pressure value that occurs most frequently during use is taken for experimentation so that V0 satisfies the above formula.

[0029] Furthermore, the base groove is a concave cross section, the adjustment cover is an inverted U-shaped cross section, a sleeve is provided on the upper surface of the adjustment cover, and the lower end of the branch pipe is inserted into the sleeve and vertically slidably connected by the sleeve;

[0030] When the hydraulic pressure in the foundation groove increases, the hydraulic pressure drives the adjusting cover to move upward; when the hydraulic pressure in the foundation groove decreases, the adjusting cover moves downward under the action of gravity.

[0031] In order to ensure that the hydraulic pressure is the same or similar, in this solution, the base groove is opened upward and the adjusting cover is arranged in the base groove. When the hydraulic pressure drives the adjusting cover to move upward, the adjusting cover stops rising when the weight of the hydraulic pressure and the adjusting cover are in a balanced state, thereby ensuring that the horizontal initial velocity of the liquid when it sprays out of the first strip hole is V0, thereby ensuring sufficient contact between gas and liquid.

[0032] Furthermore, the distribution trough further comprises a bottom plate, both ends of which are respectively connected to the side walls of the evaporation tower, a plurality of elastic members are arranged on the bottom plate, the elastic members are connected to the upper end and the adjusting cover with a concave cross section, the upper opening of the adjusting cover is accommodated in the base trough, the base trough is an inverted U-shaped cross section opening downward, and the upper side of the base trough is respectively fixedly connected and communicated with the lower ends of the plurality of branch pipes;

[0033] When the hydraulic pressure in the base groove increases, the hydraulic pressure drives the regulating cover to move downward; when the liquid in the base groove decreases, the regulating cover moves upward and resets under the action of the elastic member.

[0034] Furthermore, the elastic member is a rubber spring.

[0035] This setting has the following effects:

[0036] 1. If the base groove opening faces upward, the branch pipe can only be connected to the upper surface of the regulating cover by sliding so as to transport the liquid into the base groove. However, the sliding connection between the branch pipe and the regulating cover is prone to cause wear of the branch pipe, reducing the durability of the branch pipe;

[0037] Therefore, this solution reverses the installation direction of the base trough and the adjustment cover, with the base trough opening facing downward and the adjustment cover set below the base trough. The base plate and elastic parts are used as supports to directly fix the branch pipe to the base trough without worrying about wear on the branch pipe.

[0038] 2. The liquid flows out from the gap between the regulating cover and the base trough to form a second water curtain barrier. The gas needs to pass through the first water curtain barrier and the second water curtain barrier in sequence, which increases the gas-liquid contact time and improves the purification efficiency.

[0039] 3. Since the position of the regulating cover is adjusted by an elastic member, the hydraulic pressure in the equilibrium state is not fixed. Therefore, the horizontal initial velocity of the liquid under the average hydraulic pressure when it sprays out of the first strip hole is calculated as V0, satisfying D / 2V0= (2h / g) （1 / 2） That's it.

[0040] 4. The elastic parts are made of rubber springs to prevent rust. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1It is a schematic diagram of the overall structure of Example 1;

[0042] Figure 2 It is a schematic top view of the liquid distributor of Example 1;

[0043] Figure 3 It is a partial schematic diagram of the distribution trough of Example 1;

[0044] Figure 4 is a top view of the distribution trough of Example 1;

[0045] Figure 5 for Figure 4 AA section view;

[0046] Figure 6 for Figure 4 BB section view;

[0047] Figure 7 A top view of the gas distributor of Example 1;

[0048] Figure 8 Schematic diagram of gas flow in Example 1;

[0049] Fig. 9 For Example 2 Figure 6 Schematic diagram of the corresponding positions;

[0050] Fig.10 It is a partial three-dimensional axonometric view of the foundation groove of Example 3;

[0051] Fig.11 For Example 4 Figure 5 Schematic diagram of the corresponding positions;

[0052] Fig.12 Schematic diagram of gas flow in Example 4;

[0053] Fig.13 It is a partial three-dimensional axonometric view of the base groove, adjustment cover and elastic member of Example 4. DETAILED DESCRIPTION

[0054] The following is further described in detail through specific implementation methods:

[0055] The figure marks in the drawings of the specification include: distillation tower 1, liquid inlet pipe 2, air inlet pipe 3, main pipe 41, branch pipe 42, first water curtain barrier 51, second water curtain barrier 52, base groove 6, first strip hole 61, first notch 62, adjustment cover 7, sleeve 71, second notch 72, second strip hole 73, horizontal plate 81, vent hole 82, V-shaped groove 83, bottom plate 91, elastic member 92.

[0056] Example 1

[0057] Example 1 is basically as Figure 1-Figure 8 As shown: A distillation and purification device includes a distillation tower 1, and the distillation tower 1 is a packing type, such as Figure 1 As shown, a liquid inlet pipe 2 and a liquid distributor are provided at the top of the distillation tower 1. The liquid distributor includes a main pipe 41, a plurality of branch pipes 42 and a plurality of distribution tanks which are connected in sequence. The liquid inlet pipe 2 and the main pipe 41 are connected and are arranged horizontally. Figure 2 As shown, the front and rear ends of the main pipe 41 are respectively connected to the side wall of the distillation tower 1, and an air inlet pipe 3 is provided at the bottom of the distillation tower 1 for air intake. Figure 1 As shown, the main pipe 41 is connected to the upper ends of several branch pipes 42 respectively;

[0058] like Figure 2 As shown, several distribution slots are arranged horizontally and in parallel at the same height, such as Figure 3 As shown, Figure 3 Only the middle section of the distribution trough is shown. The distribution trough includes a base trough 6 and an adjustment cover 7 that cooperate with each other. The base trough 6 is a concave cross-section. A plurality of vertical first strip holes 61 are opened on the side of the base trough 6. The spacing between adjacent first strip holes 61 is based on actual conditions. Usually, the spacing between adjacent first strip holes 61 is small enough to regard the water sprayed from each first strip hole 61 as connected and forming a Figure 8 The first water curtain barrier 51 is shown.

[0059] The adjustment cover 7 is vertically slidable and is arranged in the base groove 6 with clearance fit. Figure 4 , Figure 5 , Figure 6 As shown, the regulating cover 7 is an inverted U-shaped cross section, a sleeve 71 is vertically welded on the upper surface of the regulating cover 7, the lower end of the branch pipe 42 is inserted into the sleeve 71 and the sleeve 71 is gap-matched, as long as the hydraulic pressure is within the design range, the liquid cannot pass through the gap between the branch pipe 42 and the sleeve 71, and a second notch 72 is opened on the side of the regulating cover 7. The second notch 72 is a whole large notch, and the horizontal length of the second notch 72 is equal to the maximum distance between the first strip holes 61 at both ends of the base groove 6. The second notch 72 runs through the lower edge of the side of the regulating cover 7, and the height of the second notch 72 is half the height of the first strip hole 61;

[0060] like Figure 3 , Figure 5 , Figure 6 As shown, in the initial state, the second notch 72 and the first strip hole 61 partially overlap, and the adjusting cover 7 partially blocks the first strip hole 61; when the hydraulic pressure in the base groove 6 increases, the hydraulic pressure drives the adjusting cover 7 to move away from the base groove 6 and upward, the blocking area of ​​the first strip hole 61 by the adjusting cover 7 decreases, and the flow rate of the first strip hole 61 increases; when the hydraulic pressure in the base groove 6 decreases, the adjusting cover 7 moves downward under the action of gravity.

[0061] A gas distributor is also provided at the top of the distillation tower 1, and the gas distributor is arranged below the liquid distributor. Figure 8As shown, the gas distributor includes a horizontal plate 81, which is connected to the inner side of the evaporation tower with bolts in the circumferential direction. A plurality of vent holes 82 are opened on the horizontal plate 81. A plurality of horizontal and parallel V-shaped grooves 83 are welded on the upper surface of the horizontal plate 81. In the horizontal direction, the V-shaped groove 83 is located between two adjacent base grooves 6 of the liquid distributor, and the vent hole 82 is located between two adjacent V-shaped grooves 83. The plane layout of the V-shaped groove 83 is as shown in FIG. Figure 7 As shown, Figure 7 The vent hole 82 is omitted.

[0062] Example 2

[0063] The difference between Example 2 and Example 1 is that: Fig. 9 As shown, the second notch 72 is divided into a plurality of n-shaped second strip holes 73 , and the number of the second strip holes 73 and the first strip holes 61 are equal and their positions correspond one to one.

[0064] Example 3

[0065] Embodiment 3 is based on Embodiment 1, a first notch 62 is further opened on the side of the adjustment cover 7, the notch is connected to the upper ends of the first strip holes 61, and the second notch 72 is equal to the first notch 62 in length;

[0066] In the initial state, the second notch 72 and the first strip hole 61 partially overlap, the adjustment cover 7 partially covers the first strip hole 61, and the adjustment cover 7 completely covers the first notch 62;

[0067] When the hydraulic pressure in the base groove 6 increases, the hydraulic pressure drives the adjusting cover 7 to move away from the base groove 6 and upward, and the covering area of ​​the first strip hole 61 by the adjusting cover 7 decreases, the second notch 72 and the first notch 62 partially overlap, and the adjusting cover 7 partially covers the first notch 62;

[0068] Finally, the first strip-shaped hole 61 and the first notch 62 are completely exposed.

[0069] Compared with the liquid spraying out from the first strip hole 61, when the liquid sprays out from the first notch 62, the first water curtain barrier 51 formed is more continuous and stable, and can better prevent the gas from rising and fully contacting with the liquid;

[0070] In addition, to facilitate installation, a gap is usually left between the end of the base trench 6 and the inner side of the evaporation tower. If the gas rises from the end of the base trench 6, the efficiency of gas-liquid contact will be reduced. In the present embodiment, when liquid is ejected from the first strip hole 61 and the first notch 62 at the same time, the liquid ejected from the first strip hole 61 forms a vertical partitioning water curtain under the first water curtain barrier 51, which divides the gas under the first water curtain barrier 51 into pieces, preventing the gas from moving in the horizontal direction and bypassing the first water curtain barrier 51 from the end of the base trench 6, thereby improving the efficiency of gas-liquid contact.

[0071] The initial horizontal velocity of the liquid when it sprays out of the first notch 62 is V0, and V0 satisfies the following formula:

[0072] = ;

[0073] D-the distance between adjacent base grooves 6;

[0074] g - acceleration due to gravity;

[0075] h—the height difference between the lowest point of the first notch 62 and the lowest point in the V-shaped groove 83 .

[0076] In the above formula, it is assumed that the liquid motion trajectory is as follows Figure 8 The first water curtain barrier 51 shown in FIG. 1 determines that the liquid finally falls on the bottom of the V-shaped groove 83 between the two adjacent base grooves 6. The movement time t of the liquid in the horizontal direction and the vertical direction are equal, so the horizontal initial velocity of the liquid when it sprays out of the first notch 62 is reversely deduced to be V0, that is, the above formula is obtained by combining the following displacement formulas in the horizontal direction and the vertical direction:

[0077] Horizontal direction: D = V0 × t;

[0078] Vertical direction: h= .

[0079] Example 4

[0080] The difference between Example 4 and Example 3 is that the installation directions of the base groove 6 and the adjustment cover 7 are reversed. Specifically:

[0081] The distribution trough further comprises a bottom plate 91, both ends of which are respectively welded to the side walls of the evaporation tower. Fig.11 , Fig.13 As shown, the bottom plate 91 is arranged parallel to and just below the base groove 6, and a plurality of elastic members 92 are equidistantly bonded to the bottom plate 91, and the elastic members 92 are all rubber springs, and the elastic members 92 are bonded to the upper end and the bottom of the adjustment cover 7 with a concave cross section, and the upper opening of the adjustment cover 7 is accommodated in the base groove 6, and the base groove 6 is an inverted U-shaped cross section opening downward, and the upper side of the base groove 6 is respectively welded and connected to the lower ends of the plurality of branch pipes 42;

[0082] When the hydraulic pressure in the base groove 6 increases, the hydraulic pressure drives the regulating cover 7 to move downward; when the liquid in the base groove 6 decreases, the regulating cover 7 moves upward and resets under the action of the elastic member 92 .

[0083] like Fig.12 As shown, the liquid flowing out of the first notch 62 forms a first water curtain barrier 51, and the first water curtain barrier 51 is a horizontal projection trajectory. The first water curtain barrier 51 and the second water curtain barrier 52 are both indicated by dotted lines. The first water curtain barrier 51 blocks the passage for the gas to rise, so that the gas has to pass through the first water curtain barrier 51;

[0084] The liquid flows out from the gap between the adjusting cover 7 and the base groove 6, and two second water curtain barriers 52 are formed corresponding to each base layer. The vent hole 82 is arranged between the above two second water curtain barriers 52; the gas needs to pass through the first water curtain barrier 51 and the second water curtain barrier 52 in sequence, which increases the gas-liquid contact time and improves the purification efficiency.

[0085] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A distillation purification device, characterized in that: The distillation tower is a packing type. A liquid inlet pipe and a liquid distributor are arranged at the top of the distillation tower. The liquid distributor includes a main pipe, a plurality of branch pipes and a plurality of distribution slots which are connected in sequence. The liquid inlet pipe is connected to the main pipe. The plurality of distribution slots are arranged horizontally and in parallel at the same height. The distribution slots include a base slot and an adjustment cover which cooperate with each other. A plurality of vertical first strip holes are arranged on the side of the base slot. The adjustment cover is vertically slidably arranged in the base slot. A second notch is arranged on the side of the adjustment cover. The second notch passes through the lower edge of the side of the adjustment cover. In the initial state, the second notch and the first strip hole partially overlap, and the adjusting cover partially blocks the first strip hole; when the hydraulic pressure in the base groove increases, the hydraulic pressure drives the adjusting cover away from the base groove, the blocking area of ​​the first strip hole by the adjusting cover decreases, and the flow rate of the first strip hole increases.

2. A distillation purification device according to claim 1, characterized in that: The main pipe is arranged horizontally, both ends of the main pipe are connected to the side walls of the distillation tower, and the main pipe is connected to the upper ends of several branch pipes respectively.

3. A distillation purification device according to claim 2, characterized in that: A gas distributor is also provided on the top of the distillation tower. The gas distributor includes a plurality of horizontal, parallel V-shaped grooves. In the horizontal direction, the V-shaped groove is located between two adjacent base grooves of the liquid distributor; the space between adjacent V-shaped grooves is used for gas to pass through.

4. A distillation purification device according to claim 3, characterized in that: The second notch is divided into a plurality of n-shaped second strip holes, the number of the second strip holes is equal to the number of the first strip holes and the positions correspond one to one.

5. A distillation purification device according to claim 3, characterized in that: A first notch is also provided on the side of the regulating cover, the notch is connected to a plurality of first strip holes at the same time, and the second notch is equal in length to the first notch; In the initial state, the second notch and the first strip hole partially overlap, and the adjustment cover partially covers the first strip hole; When the hydraulic pressure in the base groove increases, the hydraulic pressure drives the adjustment cover away from the base groove, the covering area of ​​the first strip hole by the adjustment cover decreases, the second notch partially overlaps with the first notch, and the adjustment cover partially covers the first notch; Finally, the first strip-shaped hole and the first notch are completely exposed.

6. A distillation purification device according to claim 5, characterized in that: The initial horizontal velocity of the liquid when it sprays out of the first gap is V0, and V0 satisfies the following formula: = ； D-the distance between adjacent base grooves; g - acceleration due to gravity; h - the height difference from the lowest point of the first notch to the lowest point in the V-shaped groove.

7. A distillation purification device according to claim 6, characterized in that: The base groove has a concave cross section, the adjustment cover has an inverted U-shaped cross section, a sleeve is provided on the upper surface of the adjustment cover, the lower end of the branch pipe is inserted into the sleeve and is vertically slidably connected by the sleeve; When the hydraulic pressure in the foundation groove increases, the hydraulic pressure drives the adjusting cover to move upward; when the hydraulic pressure in the foundation groove decreases, the adjusting cover moves downward under the action of gravity.

8. A distillation purification device according to claim 6, characterized in that: The distribution trough also includes a bottom plate, both ends of which are connected to the side walls of the evaporation tower respectively, and a plurality of elastic members are arranged on the bottom plate, the elastic members are connected to the upper end and the adjusting cover with a concave cross section, the upper opening of the adjusting cover is accommodated in the base trough, the base trough is an inverted U-shaped cross section opening downward, and the upper side of the base trough is fixedly connected and communicated with the lower ends of the plurality of branch pipes respectively; When the hydraulic pressure in the base groove increases, the hydraulic pressure drives the regulating cover to move downward; when the liquid in the base groove decreases, the regulating cover moves upward and resets under the action of the elastic member.

9. A distillation purification device according to claim 8, characterized in that: The elastic member is a rubber spring.

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