A vertical absorption device

Abstract

The present invention discloses a vertical absorption device in the field of waste heat refrigeration technology, comprising a shell A and a base B. The shell A includes an upper shell, a gas phase pipeline, a lean liquid inlet, and a nozzle. The base B includes a front-end circulating water outlet pipe, a circulating water inlet pipe, a support pipe, a spiral coil, a liquid redistributor, a rear-end circulating water outlet pipe, a lower shell, and a rich liquid outlet pipe. Compared with horizontal absorption devices, when the heat exchange area is the same, the vertical coil absorption device significantly reduces the floor space. Compared with packed tower vertical absorption towers, the vertical coil absorption device has a more compact internal structure, a smaller diameter and height, and a smaller device volume, saving costs. According to simulation calculations, the "wet area" of the coil surface accounts for 86% when using the vertical coil absorption device, while the "wet area" of the tube surface of the existing horizontal absorption device accounts for 81%. The larger the "wet area" on the heat exchange tube surface, the better the liquid distribution effect and the higher the mass transfer and heat exchange efficiency. The shell A and base B are separable, which facilitates later maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat refrigeration, in particular to a vertical absorption device. Background Art

[0002] The absorption unit in low-grade waste heat recovery and utilization is a crucial link in the entire heat pump and waste heat refrigeration system. Its absorption effect determines the absorption efficiency and mass and heat transfer efficiency of the entire absorption system.

[0003] In existing technologies, absorbers or absorption towers mostly use packed towers to enhance mass and heat transfer by increasing the gas-liquid heat exchange surface. However, for special cases, such as when lean liquid absorbs the gas phase and the released heat needs to be removed, ordinary packed towers are no longer sufficient. In contrast, horizontal absorption, combined with the heat exchanger structure, improves the tube type and liquid distribution method based on the shell-and-tube heat exchanger. However, horizontal absorbers are bulky and occupy too much floor space. Conventional vertical absorption towers improve mass and heat transfer efficiency by optimizing the tube arrangement or tube type. However, liquid distribution in vertical tubes is difficult because even with a liquid distributor, uniform liquid distribution can be achieved over a certain distance. However, for large absorbers, the longer vertical tubes tend to cause the liquid film on the tube wall to converge and form liquid streams. In all of the above situations, whether using the commonly used ammonia absorption system or the single-effect lithium bromide absorption system, the absorption efficiency remains low, a serious problem. To achieve the desired absorbent absorption capacity, existing technologies, in addition to adding additives to the working fluid, increase the heat exchange area of ​​the tubes to further improve the absorption capacity. However, this increases the volume of the absorption device, further increasing costs. Alternatively, more expensive uniform piping methods such as corrugated tubes are used, sacrificing a certain amount of pressure loss to increase the turbulence intensity of the circulating water within the tubes, thereby enhancing the heat exchange effect. However, this does not significantly improve the liquid distribution outside the tubes and has little impact on improving the absorbent's absorption efficiency.

[0004] In order to solve these problems, the present application combines the existing technology to carry out a new process design and proposes a vertical absorption device. Summary of the Invention

[0005] The object of the present invention is to provide a vertical absorption device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a vertical absorption device, comprising an outer shell A and a base B, wherein the outer shell A comprises an upper shell, a gas phase pipeline, a lean liquid inlet and a nozzle, and the base B comprises a front-stage circulating water outlet pipe, a circulating water inlet pipe, a support pipe, a spiral coil, a liquid redistributor, a rear-stage circulating water outlet pipe, a lower shell and a rich liquid outlet pipe.

[0007] Preferably, the gas phase pipeline is fixedly plugged into the side wall of the upper shell, the through-hole of the lean liquid inlet is plugged into the top wall of the upper shell, and the lower end of the lean liquid inlet is through-hole connected to a nozzle.

[0008] Preferably, a rich liquid outlet pipe is fixedly inserted through the bottom wall of the lower shell, a front-section circulating water outlet pipe is fixedly inserted through the lower shell, the front-section circulating water outlet pipe is connected to the rear-section circulating water outlet pipe, a circulating water inlet pipe is fixedly inserted through the lower shell, and a spiral coil and a liquid redistributor arranged at intervals are provided between the rear-section circulating water outlet pipe and the circulating water inlet pipe. Four support tubes are arranged around the sides of the spiral coil and the liquid redistributor, and the four support tubes are fixedly connected to the upper end face of the lower shell.

[0009] Preferably, the spiral coil comprises a lower layer tube, a middle layer tube and an upper layer tube which are connected through each other. The lower layer tube, the middle layer tube and the upper layer tube are arranged in an overlapping manner, and the number of the middle layer tubes is not less than five.

[0010] Preferably, the liquid redistributor is a hollow annular trough structure, and the liquid redistributor includes a peripheral weir, a liquid partition plate, a liquid accumulation trough, a liquid distribution pipe hole, a bottom plate, an overflow hole, a liquid guide pipe and a liquid inlet hole.

[0011] Preferably, the outer weir is fixedly connected to four support tubes, the lower side of the outer weir is fixedly connected to a bottom plate, the inner side of the outer weir is fixedly connected to alternately arranged liquid partition plates and liquid accumulation troughs, the liquid partition plates include two upper and lower horizontal liquid partition plates and two vertical liquid partition plates, the lower horizontal liquid partition plate is provided with evenly arranged liquid distribution pipe holes, a liquid guide tube is connected through the two vertical liquid partition plates, the upper side of the vertical liquid partition plate is provided with continuously arranged overflow holes, and the lower side of the vertical liquid partition plate is provided with continuously arranged liquid inlet holes.

[0012] Preferably, the diameter of the spiral coil is smaller than that of the liquid redistributor.

[0013] Preferably, the diameter of the liquid inlet hole is smaller than that of the overflow hole.

[0014] Preferably, the shell A and the base B are connected by bolts, and a sealing gasket is provided between the shell A and the base B.

[0015] Preferably, corresponding valves are provided on the front-stage circulating water outlet pipe, circulating water inlet pipe, gas phase pipeline, lean liquid inlet and rich liquid outlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] When the heat exchange area is the same, compared with the horizontal absorption device, the vertical coil absorption device greatly reduces the floor space. Compared with the packed tower vertical absorption tower, the vertical coil absorption device has a more compact internal structure, smaller diameter and height, smaller equipment volume, and saves costs.

[0018] According to simulation calculations, the "wet area" of the coil surface accounts for 86% when using this vertical coil absorption device, while the "wet area" of the tube surface of the existing horizontal absorption device accounts for 81%. The larger the "wet area" on the heat exchange tube surface, the better the liquid distribution effect and the higher the mass transfer and heat exchange efficiency.

[0019] The shell A and the base B can be separated, which is convenient for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the split structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the lower tube structure of the present invention;

[0024] Figure 4 Schematic diagram of the upper tube structure of the present invention;

[0025] Figure 5 Schematic diagram of the top view of the liquid redistributor of the present invention;

[0026] Figure 6 It is a bottom view structural schematic diagram of the liquid redistributor of the present invention;

[0027] Figure 7 Schematic diagram of the three-dimensional structure of the liquid partition plate of the present invention Figure 1 ;

[0028] Figure 8 Schematic diagram of the three-dimensional structure of the liquid partition plate of the present invention Figure 2 .

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] Upper shell 1, front section circulating water outlet pipe 2, circulating water inlet pipe 3, support pipe 4, gas phase pipeline 5, spiral coil 6, lower layer pipe 61, upper layer pipe 62, liquid redistributor 7, outer weir 71, liquid partition plate 72, horizontal liquid partition plate 721, vertical liquid partition plate 722, liquid accumulation tank 73, liquid distribution pipe hole 74, bottom plate 75, overflow hole 76, liquid guide pipe 77, liquid inlet hole 78, lean liquid inlet 8, nozzle 9, rear section circulating water outlet pipe 10, lower shell 11, rich liquid outlet pipe 12. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] The present invention aims to provide a horizontal absorption device with point-type liquid distribution to solve the problems raised in the above background technology. To achieve the above object, the present invention provides the following technical solutions:

[0033] like Figure 1 The vertical coil absorption device consists of an upper shell 1, a front-stage circulating water outlet pipe 2, a circulating water inlet pipe 3, a support pipe 4, a gas phase pipeline 5, a spiral coil 6, a liquid redistributor 7, a lean liquid inlet 8, a nozzle 9, a rear-stage circulating water outlet pipe 10, a lower shell 11, and a rich liquid outlet pipe 12; among which the upper shell 1, the gas phase pipeline 5, the lean liquid inlet 8 and the nozzle 9 are connected to form an upper shell A, and all other components are connected to the lower shell 11 to form a base B. The lean solution flows in from the lean liquid inlet 8 pipe and is evenly sprayed onto the surface of the spiral coil 6 through the nozzle 9; the lean liquid drips on at least five layers of the middle layer pipe and is collected by the liquid redistributor 7 before continuing to be distributed on the surface of the lower layer of the spiral coil 6; the lean liquid absorbs the gas phase flowing in through the gas phase pipe 5 inlet to become a rich solution, and flows out of this vertical coil absorption device through the rich liquid outlet pipe 12; the circulating water enters the rear section circulating water outlet pipe 10 through the front section circulating water outlet pipe 2 and then flows into each layer of the spiral coil, and finally converges into the circulating water inlet pipe 3 to flow out of this vertical coil absorption device.

[0034] The vertical coil absorption device provided by the present invention is divided into an upper and lower structure: an outer shell A and a base B. The outer shell A and the base B are connected by a flange. The outer top of the outer shell A is connected to the lean liquid inlet 8, and one or more thin tubes are evenly distributed inside. The thin tubes are connected to the nozzle 9 by threads, and the gas phase pipeline 5 is welded to the bottom of the outer shell A; the base B consists of a front-section circulating water outlet pipe 2, a circulating water inlet pipe 3, a support pipe 4, a spiral coil 6, a liquid redistributor 7, a rear-section circulating water outlet pipe 10, a lower shell 11 and a rich liquid outlet pipe 12.

[0035] The above-mentioned group of spiral coils 6 is composed of a lower tube 61, a middle tube and an upper tube 62 arranged in an overlapping manner. The lower tube 61, the middle tube and the upper tube 62 are all composed of more than one coil using the same winding method. The outer surface spacing of adjacent tubes of the middle coil is more than 3 mm; a liquid redistributor 7 is arranged between multiple spiral coils 6; the outer surface spacing of the liquid redistributor 7 and the upper layer of spiral coil 6 is more than 3 mm; the outer surface spacing of the liquid redistributor 7 and the lower layer of spiral coil 6 is more than 3 mm; the above-mentioned liquid redistributor 7 satisfies the liquid collection and redistribution function.

[0036] All of the above-mentioned spiral coils 6 are fixed horizontally and cannot float. The effect achieved is that the lean liquid evenly sprayed on the top is evenly distributed on the surface of the spiral coil 6. After absorbing the shell-side gas phase, it can be collected again through the liquid redistributor 7 and evenly distributed again to the surface of the next group of spiral coils 6 to absorb the gas phase and turn it into rich liquid, and finally flow out of the device through the rich liquid outlet pipe 12.

[0037] The liquid redistributor provided by the present invention, after the liquid drips onto the bottom plate 75 and the transverse liquid partition plate 721, the liquid level in the liquid storage tank 73 is gradually raised by the outer weir 71, and at the same time, the liquid guide tube 77 passing through the liquid partition plate 72 is connected in series to all the liquid storage tanks 73, so that the liquid level in the liquid storage tank 73 is consistent. When the liquid level rises to the evenly distributed liquid inlet holes 78, the liquid enters between the two vertical liquid partition plates 722 through the liquid inlet holes 78 between the vertical liquid partition plates 722, and finally drips onto the surface of the lower spiral coil 6 through the evenly distributed liquid distribution pipe holes 74 on the transverse liquid partition plate 721; the above-mentioned liquid inlet holes 78 have a small aperture. If the liquid flow rate is large, when the liquid level in the liquid storage tank rises to the overflow hole 76 with a larger aperture, a large amount of liquid enters the two vertical liquid partition plates 722.

[0038] The above-mentioned liquid distribution pipe holes 74, liquid accumulation grooves 73, and spiral coils 6 are coaxial and evenly distributed, with more than 10 liquid distribution pipe holes in each circle; the angle between the liquid distribution pipe holes 74 and the vertical direction is more than 1°, and the outlet of the liquid distribution pipe holes 74 is a pointed mouth shape, so as to reduce the dispersion of liquid droplets when the liquid flows out of the liquid distribution pipe holes 74 and enhance the convergence effect.

[0039] One end of all the spiral coils 6 is connected to the rear circulating water outlet pipe 10, and the other end is connected to the circulating water inlet pipe 3; the circulating water adopts the bottom-in and bottom-out method; preferably, an elbow is added to the top of the circulating water inlet pipe, so that the circulating water entering the bottom reaches the corresponding height and then enters each spiral coil 6 respectively, which can realize bottom-in and top-out, thereby improving the fluid heat exchange efficiency; the heat released when the lean liquid absorbs the gas phase is taken away by the circulating water.

[0040] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A vertical absorption device, comprising a housing A and a base B, characterized in that: The housing A comprises an upper shell (1), a gas phase pipeline (5), a lean liquid inlet (8) and a nozzle (9); the base B comprises a front section circulating water outlet pipe (2), a circulating water inlet pipe (3), a support pipe (4), a spiral coil (6), a liquid redistributor (7), a rear section circulating water outlet pipe (10), a lower shell (11) and a rich liquid outlet pipe (12); The gas phase pipeline (5) is fixedly plugged into the side wall of the upper shell (1), the lean liquid inlet (8) is plugged into the top wall of the upper shell (1), and the lower end of the lean liquid inlet (8) is connected to the nozzle (9); A rich liquid outlet pipe (12) is fixedly inserted through the bottom wall of the lower shell (11), a front-section circulating water outlet pipe (2) is fixedly inserted through the lower shell (11), the front-section circulating water outlet pipe (2) is connected to the rear-section circulating water outlet pipe (10), a circulating water inlet pipe (3) is fixedly inserted through the lower shell (11), and a spiral coil (6) and a liquid redistributor (7) arranged in an interval manner are provided between the rear-section circulating water outlet pipe (10) and the circulating water inlet pipe (3), four support pipes (4) are provided around the sides of the spiral coil (6) and the liquid redistributor (7), and the four support pipes (4) are fixedly connected to the upper end surface of the lower shell (11).

2. A vertical absorption device according to claim 1, characterized in that: The spiral coil (6) comprises a lower layer tube (61), a middle layer tube and an upper layer tube (62) which are connected through each other. The lower layer tube (61), the middle layer tube and the upper layer tube (62) are arranged in an overlapping manner. The number of the middle layer tubes is not less than five. The lower layer tube (61), the middle layer tube and the upper layer tube (62) are all composed of one or more coils using the same winding method. The outer surface spacing of adjacent tubes of the middle layer coil is more than 3 mm. The outer surface spacing of the liquid redistributor (7) and the upper layer spiral coil (6) is more than 3 mm. The outer surface spacing of the liquid redistributor (7) and the lower layer spiral coil (6) is more than 3 mm.

3. A vertical absorption device according to claim 2, characterized in that: The liquid redistributor (7) is a hollow annular trough structure, and comprises an outer weir (71), a liquid partition plate (72), a liquid accumulation trough (73), a liquid distribution pipe hole (74), a bottom plate (75), an overflow hole (76), a liquid guide pipe (77) and a liquid inlet hole (78).

4. A vertical absorption device according to claim 3, characterized in that: The peripheral weir (71) is fixedly connected to the four support tubes (4); a bottom plate (75) is fixedly connected to the lower side of the peripheral weir (71); alternately arranged liquid partition plates (72) and liquid accumulation grooves (73) are fixedly connected to the inner side of the peripheral weir (71); the liquid partition plates (72) include two upper and lower horizontal liquid partition plates (721) and two vertical liquid partition plates (722); the lower horizontal liquid partition plate (721) is provided with evenly arranged liquid distribution pipe holes (74); a liquid guide pipe (77) is connected between the two vertical liquid partition plates (722); the upper side of the vertical liquid partition plates (722) is provided with continuously arranged overflow holes (76); the lower side of the vertical liquid partition plates (722) is provided with continuously arranged liquid inlet holes (78).

5. A vertical absorption device according to claim 4, characterized in that: The diameter of the spiral coil (6) is smaller than that of the liquid redistributor (7).

6. A vertical absorption device according to claim 5, characterized in that: The diameter of the liquid inlet hole (78) is smaller than that of the overflow hole (76).

7. A vertical absorption device according to claim 6, characterized in that: The shell A and the base B are connected by flanges and bolts, and a sealing gasket is provided between the shell A and the base B.

8. A vertical absorption device according to claim 6 or 7, characterized in that: Corresponding valves are provided on the front-stage circulating water outlet pipe (2), the circulating water inlet pipe (3), the gas phase pipeline (5), the lean liquid inlet (8) and the rich liquid outlet pipe (12).

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